19196d8acSJiri Slaby /* 29196d8acSJiri Slaby * Driver for 8250/16550-type serial ports 39196d8acSJiri Slaby * 49196d8acSJiri Slaby * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o. 59196d8acSJiri Slaby * 69196d8acSJiri Slaby * Copyright (C) 2001 Russell King. 79196d8acSJiri Slaby * 89196d8acSJiri Slaby * This program is free software; you can redistribute it and/or modify 99196d8acSJiri Slaby * it under the terms of the GNU General Public License as published by 109196d8acSJiri Slaby * the Free Software Foundation; either version 2 of the License, or 119196d8acSJiri Slaby * (at your option) any later version. 129196d8acSJiri Slaby * 139196d8acSJiri Slaby * A note about mapbase / membase 149196d8acSJiri Slaby * 159196d8acSJiri Slaby * mapbase is the physical address of the IO port. 169196d8acSJiri Slaby * membase is an 'ioremapped' cookie. 179196d8acSJiri Slaby */ 189196d8acSJiri Slaby 199196d8acSJiri Slaby #if defined(CONFIG_SERIAL_8250_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) 209196d8acSJiri Slaby #define SUPPORT_SYSRQ 219196d8acSJiri Slaby #endif 229196d8acSJiri Slaby 239196d8acSJiri Slaby #include <linux/module.h> 249196d8acSJiri Slaby #include <linux/moduleparam.h> 259196d8acSJiri Slaby #include <linux/ioport.h> 269196d8acSJiri Slaby #include <linux/init.h> 279196d8acSJiri Slaby #include <linux/console.h> 289196d8acSJiri Slaby #include <linux/sysrq.h> 299196d8acSJiri Slaby #include <linux/delay.h> 309196d8acSJiri Slaby #include <linux/platform_device.h> 319196d8acSJiri Slaby #include <linux/tty.h> 329196d8acSJiri Slaby #include <linux/ratelimit.h> 339196d8acSJiri Slaby #include <linux/tty_flip.h> 349196d8acSJiri Slaby #include <linux/serial_core.h> 359196d8acSJiri Slaby #include <linux/serial.h> 369196d8acSJiri Slaby #include <linux/serial_8250.h> 379196d8acSJiri Slaby #include <linux/nmi.h> 389196d8acSJiri Slaby #include <linux/mutex.h> 399196d8acSJiri Slaby #include <linux/slab.h> 400b4af1d9SRicardo Ribalda Delgado #include <linux/uaccess.h> 41d74d5d1bSSebastian Andrzej Siewior #include <linux/pm_runtime.h> 429196d8acSJiri Slaby #ifdef CONFIG_SPARC 439196d8acSJiri Slaby #include <linux/sunserialcore.h> 449196d8acSJiri Slaby #endif 459196d8acSJiri Slaby 469196d8acSJiri Slaby #include <asm/io.h> 479196d8acSJiri Slaby #include <asm/irq.h> 489196d8acSJiri Slaby 499196d8acSJiri Slaby #include "8250.h" 509196d8acSJiri Slaby 519196d8acSJiri Slaby /* 529196d8acSJiri Slaby * Configuration: 539196d8acSJiri Slaby * share_irqs - whether we pass IRQF_SHARED to request_irq(). This option 549196d8acSJiri Slaby * is unsafe when used on edge-triggered interrupts. 559196d8acSJiri Slaby */ 569196d8acSJiri Slaby static unsigned int share_irqs = SERIAL8250_SHARE_IRQS; 579196d8acSJiri Slaby 589196d8acSJiri Slaby static unsigned int nr_uarts = CONFIG_SERIAL_8250_RUNTIME_UARTS; 599196d8acSJiri Slaby 609196d8acSJiri Slaby static struct uart_driver serial8250_reg; 619196d8acSJiri Slaby 629196d8acSJiri Slaby static int serial_index(struct uart_port *port) 639196d8acSJiri Slaby { 6451c39814SPeter Hurley return port->minor - 64; 659196d8acSJiri Slaby } 669196d8acSJiri Slaby 679196d8acSJiri Slaby static unsigned int skip_txen_test; /* force skip of txen test at init time */ 689196d8acSJiri Slaby 699196d8acSJiri Slaby /* 709196d8acSJiri Slaby * Debugging. 719196d8acSJiri Slaby */ 729196d8acSJiri Slaby #if 0 739196d8acSJiri Slaby #define DEBUG_AUTOCONF(fmt...) printk(fmt) 749196d8acSJiri Slaby #else 759196d8acSJiri Slaby #define DEBUG_AUTOCONF(fmt...) do { } while (0) 769196d8acSJiri Slaby #endif 779196d8acSJiri Slaby 789196d8acSJiri Slaby #if 0 799196d8acSJiri Slaby #define DEBUG_INTR(fmt...) printk(fmt) 809196d8acSJiri Slaby #else 819196d8acSJiri Slaby #define DEBUG_INTR(fmt...) do { } while (0) 829196d8acSJiri Slaby #endif 839196d8acSJiri Slaby 849196d8acSJiri Slaby #define PASS_LIMIT 512 859196d8acSJiri Slaby 869196d8acSJiri Slaby #define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE) 879196d8acSJiri Slaby 889196d8acSJiri Slaby 899196d8acSJiri Slaby #ifdef CONFIG_SERIAL_8250_DETECT_IRQ 909196d8acSJiri Slaby #define CONFIG_SERIAL_DETECT_IRQ 1 919196d8acSJiri Slaby #endif 929196d8acSJiri Slaby #ifdef CONFIG_SERIAL_8250_MANY_PORTS 939196d8acSJiri Slaby #define CONFIG_SERIAL_MANY_PORTS 1 949196d8acSJiri Slaby #endif 959196d8acSJiri Slaby 969196d8acSJiri Slaby /* 979196d8acSJiri Slaby * HUB6 is always on. This will be removed once the header 989196d8acSJiri Slaby * files have been cleaned. 999196d8acSJiri Slaby */ 1009196d8acSJiri Slaby #define CONFIG_HUB6 1 1019196d8acSJiri Slaby 1029196d8acSJiri Slaby #include <asm/serial.h> 1039196d8acSJiri Slaby /* 1049196d8acSJiri Slaby * SERIAL_PORT_DFNS tells us about built-in ports that have no 1059196d8acSJiri Slaby * standard enumeration mechanism. Platforms that can find all 1069196d8acSJiri Slaby * serial ports via mechanisms like ACPI or PCI need not supply it. 1079196d8acSJiri Slaby */ 1089196d8acSJiri Slaby #ifndef SERIAL_PORT_DFNS 1099196d8acSJiri Slaby #define SERIAL_PORT_DFNS 1109196d8acSJiri Slaby #endif 1119196d8acSJiri Slaby 1129196d8acSJiri Slaby static const struct old_serial_port old_serial_port[] = { 1139196d8acSJiri Slaby SERIAL_PORT_DFNS /* defined in asm/serial.h */ 1149196d8acSJiri Slaby }; 1159196d8acSJiri Slaby 1169196d8acSJiri Slaby #define UART_NR CONFIG_SERIAL_8250_NR_UARTS 1179196d8acSJiri Slaby 1189196d8acSJiri Slaby #ifdef CONFIG_SERIAL_8250_RSA 1199196d8acSJiri Slaby 1209196d8acSJiri Slaby #define PORT_RSA_MAX 4 1219196d8acSJiri Slaby static unsigned long probe_rsa[PORT_RSA_MAX]; 1229196d8acSJiri Slaby static unsigned int probe_rsa_count; 1239196d8acSJiri Slaby #endif /* CONFIG_SERIAL_8250_RSA */ 1249196d8acSJiri Slaby 1259196d8acSJiri Slaby struct irq_info { 1269196d8acSJiri Slaby struct hlist_node node; 1279196d8acSJiri Slaby int irq; 1289196d8acSJiri Slaby spinlock_t lock; /* Protects list not the hash */ 1299196d8acSJiri Slaby struct list_head *head; 1309196d8acSJiri Slaby }; 1319196d8acSJiri Slaby 1329196d8acSJiri Slaby #define NR_IRQ_HASH 32 /* Can be adjusted later */ 1339196d8acSJiri Slaby static struct hlist_head irq_lists[NR_IRQ_HASH]; 1349196d8acSJiri Slaby static DEFINE_MUTEX(hash_mutex); /* Used to walk the hash */ 1359196d8acSJiri Slaby 1369196d8acSJiri Slaby /* 1379196d8acSJiri Slaby * Here we define the default xmit fifo size used for each type of UART. 1389196d8acSJiri Slaby */ 1399196d8acSJiri Slaby static const struct serial8250_config uart_config[] = { 1409196d8acSJiri Slaby [PORT_UNKNOWN] = { 1419196d8acSJiri Slaby .name = "unknown", 1429196d8acSJiri Slaby .fifo_size = 1, 1439196d8acSJiri Slaby .tx_loadsz = 1, 1449196d8acSJiri Slaby }, 1459196d8acSJiri Slaby [PORT_8250] = { 1469196d8acSJiri Slaby .name = "8250", 1479196d8acSJiri Slaby .fifo_size = 1, 1489196d8acSJiri Slaby .tx_loadsz = 1, 1499196d8acSJiri Slaby }, 1509196d8acSJiri Slaby [PORT_16450] = { 1519196d8acSJiri Slaby .name = "16450", 1529196d8acSJiri Slaby .fifo_size = 1, 1539196d8acSJiri Slaby .tx_loadsz = 1, 1549196d8acSJiri Slaby }, 1559196d8acSJiri Slaby [PORT_16550] = { 1569196d8acSJiri Slaby .name = "16550", 1579196d8acSJiri Slaby .fifo_size = 1, 1589196d8acSJiri Slaby .tx_loadsz = 1, 1599196d8acSJiri Slaby }, 1609196d8acSJiri Slaby [PORT_16550A] = { 1619196d8acSJiri Slaby .name = "16550A", 1629196d8acSJiri Slaby .fifo_size = 16, 1639196d8acSJiri Slaby .tx_loadsz = 16, 1649196d8acSJiri Slaby .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10, 165aef9a7bdSYoshihiro YUNOMAE .rxtrig_bytes = {1, 4, 8, 14}, 1669196d8acSJiri Slaby .flags = UART_CAP_FIFO, 1679196d8acSJiri Slaby }, 1689196d8acSJiri Slaby [PORT_CIRRUS] = { 1699196d8acSJiri Slaby .name = "Cirrus", 1709196d8acSJiri Slaby .fifo_size = 1, 1719196d8acSJiri Slaby .tx_loadsz = 1, 1729196d8acSJiri Slaby }, 1739196d8acSJiri Slaby [PORT_16650] = { 1749196d8acSJiri Slaby .name = "ST16650", 1759196d8acSJiri Slaby .fifo_size = 1, 1769196d8acSJiri Slaby .tx_loadsz = 1, 1779196d8acSJiri Slaby .flags = UART_CAP_FIFO | UART_CAP_EFR | UART_CAP_SLEEP, 1789196d8acSJiri Slaby }, 1799196d8acSJiri Slaby [PORT_16650V2] = { 1809196d8acSJiri Slaby .name = "ST16650V2", 1819196d8acSJiri Slaby .fifo_size = 32, 1829196d8acSJiri Slaby .tx_loadsz = 16, 1839196d8acSJiri Slaby .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_01 | 1849196d8acSJiri Slaby UART_FCR_T_TRIG_00, 185aef9a7bdSYoshihiro YUNOMAE .rxtrig_bytes = {8, 16, 24, 28}, 1869196d8acSJiri Slaby .flags = UART_CAP_FIFO | UART_CAP_EFR | UART_CAP_SLEEP, 1879196d8acSJiri Slaby }, 1889196d8acSJiri Slaby [PORT_16750] = { 1899196d8acSJiri Slaby .name = "TI16750", 1909196d8acSJiri Slaby .fifo_size = 64, 1919196d8acSJiri Slaby .tx_loadsz = 64, 1929196d8acSJiri Slaby .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10 | 1939196d8acSJiri Slaby UART_FCR7_64BYTE, 194aef9a7bdSYoshihiro YUNOMAE .rxtrig_bytes = {1, 16, 32, 56}, 1959196d8acSJiri Slaby .flags = UART_CAP_FIFO | UART_CAP_SLEEP | UART_CAP_AFE, 1969196d8acSJiri Slaby }, 1979196d8acSJiri Slaby [PORT_STARTECH] = { 1989196d8acSJiri Slaby .name = "Startech", 1999196d8acSJiri Slaby .fifo_size = 1, 2009196d8acSJiri Slaby .tx_loadsz = 1, 2019196d8acSJiri Slaby }, 2029196d8acSJiri Slaby [PORT_16C950] = { 2039196d8acSJiri Slaby .name = "16C950/954", 2049196d8acSJiri Slaby .fifo_size = 128, 2059196d8acSJiri Slaby .tx_loadsz = 128, 2069196d8acSJiri Slaby .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10, 2079196d8acSJiri Slaby /* UART_CAP_EFR breaks billionon CF bluetooth card. */ 2089196d8acSJiri Slaby .flags = UART_CAP_FIFO | UART_CAP_SLEEP, 2099196d8acSJiri Slaby }, 2109196d8acSJiri Slaby [PORT_16654] = { 2119196d8acSJiri Slaby .name = "ST16654", 2129196d8acSJiri Slaby .fifo_size = 64, 2139196d8acSJiri Slaby .tx_loadsz = 32, 2149196d8acSJiri Slaby .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_01 | 2159196d8acSJiri Slaby UART_FCR_T_TRIG_10, 216aef9a7bdSYoshihiro YUNOMAE .rxtrig_bytes = {8, 16, 56, 60}, 2179196d8acSJiri Slaby .flags = UART_CAP_FIFO | UART_CAP_EFR | UART_CAP_SLEEP, 2189196d8acSJiri Slaby }, 2199196d8acSJiri Slaby [PORT_16850] = { 2209196d8acSJiri Slaby .name = "XR16850", 2219196d8acSJiri Slaby .fifo_size = 128, 2229196d8acSJiri Slaby .tx_loadsz = 128, 2239196d8acSJiri Slaby .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10, 2249196d8acSJiri Slaby .flags = UART_CAP_FIFO | UART_CAP_EFR | UART_CAP_SLEEP, 2259196d8acSJiri Slaby }, 2269196d8acSJiri Slaby [PORT_RSA] = { 2279196d8acSJiri Slaby .name = "RSA", 2289196d8acSJiri Slaby .fifo_size = 2048, 2299196d8acSJiri Slaby .tx_loadsz = 2048, 2309196d8acSJiri Slaby .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_11, 2319196d8acSJiri Slaby .flags = UART_CAP_FIFO, 2329196d8acSJiri Slaby }, 2339196d8acSJiri Slaby [PORT_NS16550A] = { 2349196d8acSJiri Slaby .name = "NS16550A", 2359196d8acSJiri Slaby .fifo_size = 16, 2369196d8acSJiri Slaby .tx_loadsz = 16, 2379196d8acSJiri Slaby .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10, 2389196d8acSJiri Slaby .flags = UART_CAP_FIFO | UART_NATSEMI, 2399196d8acSJiri Slaby }, 2409196d8acSJiri Slaby [PORT_XSCALE] = { 2419196d8acSJiri Slaby .name = "XScale", 2429196d8acSJiri Slaby .fifo_size = 32, 2439196d8acSJiri Slaby .tx_loadsz = 32, 2449196d8acSJiri Slaby .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10, 2459196d8acSJiri Slaby .flags = UART_CAP_FIFO | UART_CAP_UUE | UART_CAP_RTOIE, 2469196d8acSJiri Slaby }, 2479196d8acSJiri Slaby [PORT_OCTEON] = { 2489196d8acSJiri Slaby .name = "OCTEON", 2499196d8acSJiri Slaby .fifo_size = 64, 2509196d8acSJiri Slaby .tx_loadsz = 64, 2519196d8acSJiri Slaby .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10, 2529196d8acSJiri Slaby .flags = UART_CAP_FIFO, 2539196d8acSJiri Slaby }, 2549196d8acSJiri Slaby [PORT_AR7] = { 2559196d8acSJiri Slaby .name = "AR7", 2569196d8acSJiri Slaby .fifo_size = 16, 2579196d8acSJiri Slaby .tx_loadsz = 16, 2589196d8acSJiri Slaby .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_00, 2599196d8acSJiri Slaby .flags = UART_CAP_FIFO | UART_CAP_AFE, 2609196d8acSJiri Slaby }, 2619196d8acSJiri Slaby [PORT_U6_16550A] = { 2629196d8acSJiri Slaby .name = "U6_16550A", 2639196d8acSJiri Slaby .fifo_size = 64, 2649196d8acSJiri Slaby .tx_loadsz = 64, 2659196d8acSJiri Slaby .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10, 2669196d8acSJiri Slaby .flags = UART_CAP_FIFO | UART_CAP_AFE, 2679196d8acSJiri Slaby }, 2689196d8acSJiri Slaby [PORT_TEGRA] = { 2699196d8acSJiri Slaby .name = "Tegra", 2709196d8acSJiri Slaby .fifo_size = 32, 2719196d8acSJiri Slaby .tx_loadsz = 8, 2729196d8acSJiri Slaby .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_01 | 2739196d8acSJiri Slaby UART_FCR_T_TRIG_01, 274aef9a7bdSYoshihiro YUNOMAE .rxtrig_bytes = {1, 4, 8, 14}, 2759196d8acSJiri Slaby .flags = UART_CAP_FIFO | UART_CAP_RTOIE, 2769196d8acSJiri Slaby }, 2779196d8acSJiri Slaby [PORT_XR17D15X] = { 2789196d8acSJiri Slaby .name = "XR17D15X", 2799196d8acSJiri Slaby .fifo_size = 64, 2809196d8acSJiri Slaby .tx_loadsz = 64, 2819196d8acSJiri Slaby .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10, 2829196d8acSJiri Slaby .flags = UART_CAP_FIFO | UART_CAP_AFE | UART_CAP_EFR | 2839196d8acSJiri Slaby UART_CAP_SLEEP, 2849196d8acSJiri Slaby }, 2859196d8acSJiri Slaby [PORT_XR17V35X] = { 2869196d8acSJiri Slaby .name = "XR17V35X", 2879196d8acSJiri Slaby .fifo_size = 256, 2889196d8acSJiri Slaby .tx_loadsz = 256, 2899196d8acSJiri Slaby .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_11 | 2909196d8acSJiri Slaby UART_FCR_T_TRIG_11, 2919196d8acSJiri Slaby .flags = UART_CAP_FIFO | UART_CAP_AFE | UART_CAP_EFR | 2929196d8acSJiri Slaby UART_CAP_SLEEP, 2939196d8acSJiri Slaby }, 2949196d8acSJiri Slaby [PORT_LPC3220] = { 2959196d8acSJiri Slaby .name = "LPC3220", 2969196d8acSJiri Slaby .fifo_size = 64, 2979196d8acSJiri Slaby .tx_loadsz = 32, 2989196d8acSJiri Slaby .fcr = UART_FCR_DMA_SELECT | UART_FCR_ENABLE_FIFO | 2999196d8acSJiri Slaby UART_FCR_R_TRIG_00 | UART_FCR_T_TRIG_00, 3009196d8acSJiri Slaby .flags = UART_CAP_FIFO, 3019196d8acSJiri Slaby }, 3029196d8acSJiri Slaby [PORT_BRCM_TRUMANAGE] = { 3039196d8acSJiri Slaby .name = "TruManage", 3049196d8acSJiri Slaby .fifo_size = 1, 3059196d8acSJiri Slaby .tx_loadsz = 1024, 3069196d8acSJiri Slaby .flags = UART_CAP_HFIFO, 3079196d8acSJiri Slaby }, 3089196d8acSJiri Slaby [PORT_8250_CIR] = { 3099196d8acSJiri Slaby .name = "CIR port" 3109196d8acSJiri Slaby }, 3119196d8acSJiri Slaby [PORT_ALTR_16550_F32] = { 3129196d8acSJiri Slaby .name = "Altera 16550 FIFO32", 3139196d8acSJiri Slaby .fifo_size = 32, 3149196d8acSJiri Slaby .tx_loadsz = 32, 3159196d8acSJiri Slaby .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10, 3169196d8acSJiri Slaby .flags = UART_CAP_FIFO | UART_CAP_AFE, 3179196d8acSJiri Slaby }, 3189196d8acSJiri Slaby [PORT_ALTR_16550_F64] = { 3199196d8acSJiri Slaby .name = "Altera 16550 FIFO64", 3209196d8acSJiri Slaby .fifo_size = 64, 3219196d8acSJiri Slaby .tx_loadsz = 64, 3229196d8acSJiri Slaby .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10, 3239196d8acSJiri Slaby .flags = UART_CAP_FIFO | UART_CAP_AFE, 3249196d8acSJiri Slaby }, 3259196d8acSJiri Slaby [PORT_ALTR_16550_F128] = { 3269196d8acSJiri Slaby .name = "Altera 16550 FIFO128", 3279196d8acSJiri Slaby .fifo_size = 128, 3289196d8acSJiri Slaby .tx_loadsz = 128, 3299196d8acSJiri Slaby .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10, 3309196d8acSJiri Slaby .flags = UART_CAP_FIFO | UART_CAP_AFE, 3319196d8acSJiri Slaby }, 332fddceb8bSVijay Rai /* tx_loadsz is set to 63-bytes instead of 64-bytes to implement 333fddceb8bSVijay Rai workaround of errata A-008006 which states that tx_loadsz should be 334fddceb8bSVijay Rai configured less than Maximum supported fifo bytes */ 335fddceb8bSVijay Rai [PORT_16550A_FSL64] = { 336fddceb8bSVijay Rai .name = "16550A_FSL64", 337fddceb8bSVijay Rai .fifo_size = 64, 338fddceb8bSVijay Rai .tx_loadsz = 63, 339fddceb8bSVijay Rai .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10 | 340fddceb8bSVijay Rai UART_FCR7_64BYTE, 341fddceb8bSVijay Rai .flags = UART_CAP_FIFO, 342fddceb8bSVijay Rai }, 3439196d8acSJiri Slaby }; 3449196d8acSJiri Slaby 3459196d8acSJiri Slaby /* Uart divisor latch read */ 3469196d8acSJiri Slaby static int default_serial_dl_read(struct uart_8250_port *up) 3479196d8acSJiri Slaby { 3489196d8acSJiri Slaby return serial_in(up, UART_DLL) | serial_in(up, UART_DLM) << 8; 3499196d8acSJiri Slaby } 3509196d8acSJiri Slaby 3519196d8acSJiri Slaby /* Uart divisor latch write */ 3529196d8acSJiri Slaby static void default_serial_dl_write(struct uart_8250_port *up, int value) 3539196d8acSJiri Slaby { 3549196d8acSJiri Slaby serial_out(up, UART_DLL, value & 0xff); 3559196d8acSJiri Slaby serial_out(up, UART_DLM, value >> 8 & 0xff); 3569196d8acSJiri Slaby } 3579196d8acSJiri Slaby 3589196d8acSJiri Slaby #if defined(CONFIG_MIPS_ALCHEMY) || defined(CONFIG_SERIAL_8250_RT288X) 3599196d8acSJiri Slaby 3609196d8acSJiri Slaby /* Au1x00/RT288x UART hardware has a weird register layout */ 3619196d8acSJiri Slaby static const u8 au_io_in_map[] = { 3629196d8acSJiri Slaby [UART_RX] = 0, 3639196d8acSJiri Slaby [UART_IER] = 2, 3649196d8acSJiri Slaby [UART_IIR] = 3, 3659196d8acSJiri Slaby [UART_LCR] = 5, 3669196d8acSJiri Slaby [UART_MCR] = 6, 3679196d8acSJiri Slaby [UART_LSR] = 7, 3689196d8acSJiri Slaby [UART_MSR] = 8, 3699196d8acSJiri Slaby }; 3709196d8acSJiri Slaby 3719196d8acSJiri Slaby static const u8 au_io_out_map[] = { 3729196d8acSJiri Slaby [UART_TX] = 1, 3739196d8acSJiri Slaby [UART_IER] = 2, 3749196d8acSJiri Slaby [UART_FCR] = 4, 3759196d8acSJiri Slaby [UART_LCR] = 5, 3769196d8acSJiri Slaby [UART_MCR] = 6, 3779196d8acSJiri Slaby }; 3789196d8acSJiri Slaby 3799196d8acSJiri Slaby static unsigned int au_serial_in(struct uart_port *p, int offset) 3809196d8acSJiri Slaby { 3819196d8acSJiri Slaby offset = au_io_in_map[offset] << p->regshift; 3829196d8acSJiri Slaby return __raw_readl(p->membase + offset); 3839196d8acSJiri Slaby } 3849196d8acSJiri Slaby 3859196d8acSJiri Slaby static void au_serial_out(struct uart_port *p, int offset, int value) 3869196d8acSJiri Slaby { 3879196d8acSJiri Slaby offset = au_io_out_map[offset] << p->regshift; 3889196d8acSJiri Slaby __raw_writel(value, p->membase + offset); 3899196d8acSJiri Slaby } 3909196d8acSJiri Slaby 3919196d8acSJiri Slaby /* Au1x00 haven't got a standard divisor latch */ 3929196d8acSJiri Slaby static int au_serial_dl_read(struct uart_8250_port *up) 3939196d8acSJiri Slaby { 3949196d8acSJiri Slaby return __raw_readl(up->port.membase + 0x28); 3959196d8acSJiri Slaby } 3969196d8acSJiri Slaby 3979196d8acSJiri Slaby static void au_serial_dl_write(struct uart_8250_port *up, int value) 3989196d8acSJiri Slaby { 3999196d8acSJiri Slaby __raw_writel(value, up->port.membase + 0x28); 4009196d8acSJiri Slaby } 4019196d8acSJiri Slaby 4029196d8acSJiri Slaby #endif 4039196d8acSJiri Slaby 4049196d8acSJiri Slaby static unsigned int hub6_serial_in(struct uart_port *p, int offset) 4059196d8acSJiri Slaby { 4069196d8acSJiri Slaby offset = offset << p->regshift; 4079196d8acSJiri Slaby outb(p->hub6 - 1 + offset, p->iobase); 4089196d8acSJiri Slaby return inb(p->iobase + 1); 4099196d8acSJiri Slaby } 4109196d8acSJiri Slaby 4119196d8acSJiri Slaby static void hub6_serial_out(struct uart_port *p, int offset, int value) 4129196d8acSJiri Slaby { 4139196d8acSJiri Slaby offset = offset << p->regshift; 4149196d8acSJiri Slaby outb(p->hub6 - 1 + offset, p->iobase); 4159196d8acSJiri Slaby outb(value, p->iobase + 1); 4169196d8acSJiri Slaby } 4179196d8acSJiri Slaby 4189196d8acSJiri Slaby static unsigned int mem_serial_in(struct uart_port *p, int offset) 4199196d8acSJiri Slaby { 4209196d8acSJiri Slaby offset = offset << p->regshift; 4219196d8acSJiri Slaby return readb(p->membase + offset); 4229196d8acSJiri Slaby } 4239196d8acSJiri Slaby 4249196d8acSJiri Slaby static void mem_serial_out(struct uart_port *p, int offset, int value) 4259196d8acSJiri Slaby { 4269196d8acSJiri Slaby offset = offset << p->regshift; 4279196d8acSJiri Slaby writeb(value, p->membase + offset); 4289196d8acSJiri Slaby } 4299196d8acSJiri Slaby 4309196d8acSJiri Slaby static void mem32_serial_out(struct uart_port *p, int offset, int value) 4319196d8acSJiri Slaby { 4329196d8acSJiri Slaby offset = offset << p->regshift; 4339196d8acSJiri Slaby writel(value, p->membase + offset); 4349196d8acSJiri Slaby } 4359196d8acSJiri Slaby 4369196d8acSJiri Slaby static unsigned int mem32_serial_in(struct uart_port *p, int offset) 4379196d8acSJiri Slaby { 4389196d8acSJiri Slaby offset = offset << p->regshift; 4399196d8acSJiri Slaby return readl(p->membase + offset); 4409196d8acSJiri Slaby } 4419196d8acSJiri Slaby 4429196d8acSJiri Slaby static unsigned int io_serial_in(struct uart_port *p, int offset) 4439196d8acSJiri Slaby { 4449196d8acSJiri Slaby offset = offset << p->regshift; 4459196d8acSJiri Slaby return inb(p->iobase + offset); 4469196d8acSJiri Slaby } 4479196d8acSJiri Slaby 4489196d8acSJiri Slaby static void io_serial_out(struct uart_port *p, int offset, int value) 4499196d8acSJiri Slaby { 4509196d8acSJiri Slaby offset = offset << p->regshift; 4519196d8acSJiri Slaby outb(value, p->iobase + offset); 4529196d8acSJiri Slaby } 4539196d8acSJiri Slaby 4549196d8acSJiri Slaby static int serial8250_default_handle_irq(struct uart_port *port); 4559196d8acSJiri Slaby static int exar_handle_irq(struct uart_port *port); 4569196d8acSJiri Slaby 4579196d8acSJiri Slaby static void set_io_from_upio(struct uart_port *p) 4589196d8acSJiri Slaby { 459b1261c86SAndy Shevchenko struct uart_8250_port *up = up_to_u8250p(p); 4609196d8acSJiri Slaby 4619196d8acSJiri Slaby up->dl_read = default_serial_dl_read; 4629196d8acSJiri Slaby up->dl_write = default_serial_dl_write; 4639196d8acSJiri Slaby 4649196d8acSJiri Slaby switch (p->iotype) { 4659196d8acSJiri Slaby case UPIO_HUB6: 4669196d8acSJiri Slaby p->serial_in = hub6_serial_in; 4679196d8acSJiri Slaby p->serial_out = hub6_serial_out; 4689196d8acSJiri Slaby break; 4699196d8acSJiri Slaby 4709196d8acSJiri Slaby case UPIO_MEM: 4719196d8acSJiri Slaby p->serial_in = mem_serial_in; 4729196d8acSJiri Slaby p->serial_out = mem_serial_out; 4739196d8acSJiri Slaby break; 4749196d8acSJiri Slaby 4759196d8acSJiri Slaby case UPIO_MEM32: 4769196d8acSJiri Slaby p->serial_in = mem32_serial_in; 4779196d8acSJiri Slaby p->serial_out = mem32_serial_out; 4789196d8acSJiri Slaby break; 4799196d8acSJiri Slaby 4809196d8acSJiri Slaby #if defined(CONFIG_MIPS_ALCHEMY) || defined(CONFIG_SERIAL_8250_RT288X) 4819196d8acSJiri Slaby case UPIO_AU: 4829196d8acSJiri Slaby p->serial_in = au_serial_in; 4839196d8acSJiri Slaby p->serial_out = au_serial_out; 4849196d8acSJiri Slaby up->dl_read = au_serial_dl_read; 4859196d8acSJiri Slaby up->dl_write = au_serial_dl_write; 4869196d8acSJiri Slaby break; 4879196d8acSJiri Slaby #endif 4889196d8acSJiri Slaby 4899196d8acSJiri Slaby default: 4909196d8acSJiri Slaby p->serial_in = io_serial_in; 4919196d8acSJiri Slaby p->serial_out = io_serial_out; 4929196d8acSJiri Slaby break; 4939196d8acSJiri Slaby } 4949196d8acSJiri Slaby /* Remember loaded iotype */ 4959196d8acSJiri Slaby up->cur_iotype = p->iotype; 4969196d8acSJiri Slaby p->handle_irq = serial8250_default_handle_irq; 4979196d8acSJiri Slaby } 4989196d8acSJiri Slaby 4999196d8acSJiri Slaby static void 5009196d8acSJiri Slaby serial_port_out_sync(struct uart_port *p, int offset, int value) 5019196d8acSJiri Slaby { 5029196d8acSJiri Slaby switch (p->iotype) { 5039196d8acSJiri Slaby case UPIO_MEM: 5049196d8acSJiri Slaby case UPIO_MEM32: 5059196d8acSJiri Slaby case UPIO_AU: 5069196d8acSJiri Slaby p->serial_out(p, offset, value); 5079196d8acSJiri Slaby p->serial_in(p, UART_LCR); /* safe, no side-effects */ 5089196d8acSJiri Slaby break; 5099196d8acSJiri Slaby default: 5109196d8acSJiri Slaby p->serial_out(p, offset, value); 5119196d8acSJiri Slaby } 5129196d8acSJiri Slaby } 5139196d8acSJiri Slaby 5149196d8acSJiri Slaby /* 5159196d8acSJiri Slaby * For the 16C950 5169196d8acSJiri Slaby */ 5179196d8acSJiri Slaby static void serial_icr_write(struct uart_8250_port *up, int offset, int value) 5189196d8acSJiri Slaby { 5199196d8acSJiri Slaby serial_out(up, UART_SCR, offset); 5209196d8acSJiri Slaby serial_out(up, UART_ICR, value); 5219196d8acSJiri Slaby } 5229196d8acSJiri Slaby 5239196d8acSJiri Slaby static unsigned int serial_icr_read(struct uart_8250_port *up, int offset) 5249196d8acSJiri Slaby { 5259196d8acSJiri Slaby unsigned int value; 5269196d8acSJiri Slaby 5279196d8acSJiri Slaby serial_icr_write(up, UART_ACR, up->acr | UART_ACR_ICRRD); 5289196d8acSJiri Slaby serial_out(up, UART_SCR, offset); 5299196d8acSJiri Slaby value = serial_in(up, UART_ICR); 5309196d8acSJiri Slaby serial_icr_write(up, UART_ACR, up->acr); 5319196d8acSJiri Slaby 5329196d8acSJiri Slaby return value; 5339196d8acSJiri Slaby } 5349196d8acSJiri Slaby 5359196d8acSJiri Slaby /* 5369196d8acSJiri Slaby * FIFO support. 5379196d8acSJiri Slaby */ 5389196d8acSJiri Slaby static void serial8250_clear_fifos(struct uart_8250_port *p) 5399196d8acSJiri Slaby { 5409196d8acSJiri Slaby if (p->capabilities & UART_CAP_FIFO) { 5419196d8acSJiri Slaby serial_out(p, UART_FCR, UART_FCR_ENABLE_FIFO); 5429196d8acSJiri Slaby serial_out(p, UART_FCR, UART_FCR_ENABLE_FIFO | 5439196d8acSJiri Slaby UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT); 5449196d8acSJiri Slaby serial_out(p, UART_FCR, 0); 5459196d8acSJiri Slaby } 5469196d8acSJiri Slaby } 5479196d8acSJiri Slaby 5489196d8acSJiri Slaby void serial8250_clear_and_reinit_fifos(struct uart_8250_port *p) 5499196d8acSJiri Slaby { 5509196d8acSJiri Slaby serial8250_clear_fifos(p); 551aef9a7bdSYoshihiro YUNOMAE serial_out(p, UART_FCR, p->fcr); 5529196d8acSJiri Slaby } 5539196d8acSJiri Slaby EXPORT_SYMBOL_GPL(serial8250_clear_and_reinit_fifos); 5549196d8acSJiri Slaby 55577285243SSebastian Andrzej Siewior void serial8250_rpm_get(struct uart_8250_port *p) 556d74d5d1bSSebastian Andrzej Siewior { 557d74d5d1bSSebastian Andrzej Siewior if (!(p->capabilities & UART_CAP_RPM)) 558d74d5d1bSSebastian Andrzej Siewior return; 559d74d5d1bSSebastian Andrzej Siewior pm_runtime_get_sync(p->port.dev); 560d74d5d1bSSebastian Andrzej Siewior } 56177285243SSebastian Andrzej Siewior EXPORT_SYMBOL_GPL(serial8250_rpm_get); 562d74d5d1bSSebastian Andrzej Siewior 56377285243SSebastian Andrzej Siewior void serial8250_rpm_put(struct uart_8250_port *p) 564d74d5d1bSSebastian Andrzej Siewior { 565d74d5d1bSSebastian Andrzej Siewior if (!(p->capabilities & UART_CAP_RPM)) 566d74d5d1bSSebastian Andrzej Siewior return; 567d74d5d1bSSebastian Andrzej Siewior pm_runtime_mark_last_busy(p->port.dev); 568d74d5d1bSSebastian Andrzej Siewior pm_runtime_put_autosuspend(p->port.dev); 569d74d5d1bSSebastian Andrzej Siewior } 57077285243SSebastian Andrzej Siewior EXPORT_SYMBOL_GPL(serial8250_rpm_put); 571d74d5d1bSSebastian Andrzej Siewior 572d74d5d1bSSebastian Andrzej Siewior /* 5736a529abaSSebastian Andrzej Siewior * These two wrappers ensure that enable_runtime_pm_tx() can be called more than 574d74d5d1bSSebastian Andrzej Siewior * once and disable_runtime_pm_tx() will still disable RPM because the fifo is 575d74d5d1bSSebastian Andrzej Siewior * empty and the HW can idle again. 576d74d5d1bSSebastian Andrzej Siewior */ 577d74d5d1bSSebastian Andrzej Siewior static void serial8250_rpm_get_tx(struct uart_8250_port *p) 578d74d5d1bSSebastian Andrzej Siewior { 579d74d5d1bSSebastian Andrzej Siewior unsigned char rpm_active; 580d74d5d1bSSebastian Andrzej Siewior 581d74d5d1bSSebastian Andrzej Siewior if (!(p->capabilities & UART_CAP_RPM)) 582d74d5d1bSSebastian Andrzej Siewior return; 583d74d5d1bSSebastian Andrzej Siewior 584d74d5d1bSSebastian Andrzej Siewior rpm_active = xchg(&p->rpm_tx_active, 1); 585d74d5d1bSSebastian Andrzej Siewior if (rpm_active) 586d74d5d1bSSebastian Andrzej Siewior return; 587d74d5d1bSSebastian Andrzej Siewior pm_runtime_get_sync(p->port.dev); 588d74d5d1bSSebastian Andrzej Siewior } 589d74d5d1bSSebastian Andrzej Siewior 590d74d5d1bSSebastian Andrzej Siewior static void serial8250_rpm_put_tx(struct uart_8250_port *p) 591d74d5d1bSSebastian Andrzej Siewior { 592d74d5d1bSSebastian Andrzej Siewior unsigned char rpm_active; 593d74d5d1bSSebastian Andrzej Siewior 594d74d5d1bSSebastian Andrzej Siewior if (!(p->capabilities & UART_CAP_RPM)) 595d74d5d1bSSebastian Andrzej Siewior return; 596d74d5d1bSSebastian Andrzej Siewior 597d74d5d1bSSebastian Andrzej Siewior rpm_active = xchg(&p->rpm_tx_active, 0); 598d74d5d1bSSebastian Andrzej Siewior if (!rpm_active) 599d74d5d1bSSebastian Andrzej Siewior return; 600d74d5d1bSSebastian Andrzej Siewior pm_runtime_mark_last_busy(p->port.dev); 601d74d5d1bSSebastian Andrzej Siewior pm_runtime_put_autosuspend(p->port.dev); 602d74d5d1bSSebastian Andrzej Siewior } 603d74d5d1bSSebastian Andrzej Siewior 6049196d8acSJiri Slaby /* 6059196d8acSJiri Slaby * IER sleep support. UARTs which have EFRs need the "extended 6069196d8acSJiri Slaby * capability" bit enabled. Note that on XR16C850s, we need to 6079196d8acSJiri Slaby * reset LCR to write to IER. 6089196d8acSJiri Slaby */ 6099196d8acSJiri Slaby static void serial8250_set_sleep(struct uart_8250_port *p, int sleep) 6109196d8acSJiri Slaby { 611edf4edacSSudhir Sreedharan unsigned char lcr = 0, efr = 0; 6129196d8acSJiri Slaby /* 6139196d8acSJiri Slaby * Exar UARTs have a SLEEP register that enables or disables 6149196d8acSJiri Slaby * each UART to enter sleep mode separately. On the XR17V35x the 6159196d8acSJiri Slaby * register is accessible to each UART at the UART_EXAR_SLEEP 6169196d8acSJiri Slaby * offset but the UART channel may only write to the corresponding 6179196d8acSJiri Slaby * bit. 6189196d8acSJiri Slaby */ 619d74d5d1bSSebastian Andrzej Siewior serial8250_rpm_get(p); 6209196d8acSJiri Slaby if ((p->port.type == PORT_XR17V35X) || 6219196d8acSJiri Slaby (p->port.type == PORT_XR17D15X)) { 622b790f210SMichael Welling serial_out(p, UART_EXAR_SLEEP, sleep ? 0xff : 0); 623d74d5d1bSSebastian Andrzej Siewior goto out; 6249196d8acSJiri Slaby } 6259196d8acSJiri Slaby 6269196d8acSJiri Slaby if (p->capabilities & UART_CAP_SLEEP) { 6279196d8acSJiri Slaby if (p->capabilities & UART_CAP_EFR) { 628edf4edacSSudhir Sreedharan lcr = serial_in(p, UART_LCR); 629edf4edacSSudhir Sreedharan efr = serial_in(p, UART_EFR); 6309196d8acSJiri Slaby serial_out(p, UART_LCR, UART_LCR_CONF_MODE_B); 6319196d8acSJiri Slaby serial_out(p, UART_EFR, UART_EFR_ECB); 6329196d8acSJiri Slaby serial_out(p, UART_LCR, 0); 6339196d8acSJiri Slaby } 6349196d8acSJiri Slaby serial_out(p, UART_IER, sleep ? UART_IERX_SLEEP : 0); 6359196d8acSJiri Slaby if (p->capabilities & UART_CAP_EFR) { 6369196d8acSJiri Slaby serial_out(p, UART_LCR, UART_LCR_CONF_MODE_B); 637edf4edacSSudhir Sreedharan serial_out(p, UART_EFR, efr); 638edf4edacSSudhir Sreedharan serial_out(p, UART_LCR, lcr); 6399196d8acSJiri Slaby } 6409196d8acSJiri Slaby } 641d74d5d1bSSebastian Andrzej Siewior out: 642d74d5d1bSSebastian Andrzej Siewior serial8250_rpm_put(p); 6439196d8acSJiri Slaby } 6449196d8acSJiri Slaby 6459196d8acSJiri Slaby #ifdef CONFIG_SERIAL_8250_RSA 6469196d8acSJiri Slaby /* 6479196d8acSJiri Slaby * Attempts to turn on the RSA FIFO. Returns zero on failure. 6489196d8acSJiri Slaby * We set the port uart clock rate if we succeed. 6499196d8acSJiri Slaby */ 6509196d8acSJiri Slaby static int __enable_rsa(struct uart_8250_port *up) 6519196d8acSJiri Slaby { 6529196d8acSJiri Slaby unsigned char mode; 6539196d8acSJiri Slaby int result; 6549196d8acSJiri Slaby 6559196d8acSJiri Slaby mode = serial_in(up, UART_RSA_MSR); 6569196d8acSJiri Slaby result = mode & UART_RSA_MSR_FIFO; 6579196d8acSJiri Slaby 6589196d8acSJiri Slaby if (!result) { 6599196d8acSJiri Slaby serial_out(up, UART_RSA_MSR, mode | UART_RSA_MSR_FIFO); 6609196d8acSJiri Slaby mode = serial_in(up, UART_RSA_MSR); 6619196d8acSJiri Slaby result = mode & UART_RSA_MSR_FIFO; 6629196d8acSJiri Slaby } 6639196d8acSJiri Slaby 6649196d8acSJiri Slaby if (result) 6659196d8acSJiri Slaby up->port.uartclk = SERIAL_RSA_BAUD_BASE * 16; 6669196d8acSJiri Slaby 6679196d8acSJiri Slaby return result; 6689196d8acSJiri Slaby } 6699196d8acSJiri Slaby 6709196d8acSJiri Slaby static void enable_rsa(struct uart_8250_port *up) 6719196d8acSJiri Slaby { 6729196d8acSJiri Slaby if (up->port.type == PORT_RSA) { 6739196d8acSJiri Slaby if (up->port.uartclk != SERIAL_RSA_BAUD_BASE * 16) { 6749196d8acSJiri Slaby spin_lock_irq(&up->port.lock); 6759196d8acSJiri Slaby __enable_rsa(up); 6769196d8acSJiri Slaby spin_unlock_irq(&up->port.lock); 6779196d8acSJiri Slaby } 6789196d8acSJiri Slaby if (up->port.uartclk == SERIAL_RSA_BAUD_BASE * 16) 6799196d8acSJiri Slaby serial_out(up, UART_RSA_FRR, 0); 6809196d8acSJiri Slaby } 6819196d8acSJiri Slaby } 6829196d8acSJiri Slaby 6839196d8acSJiri Slaby /* 6849196d8acSJiri Slaby * Attempts to turn off the RSA FIFO. Returns zero on failure. 6859196d8acSJiri Slaby * It is unknown why interrupts were disabled in here. However, 6869196d8acSJiri Slaby * the caller is expected to preserve this behaviour by grabbing 6879196d8acSJiri Slaby * the spinlock before calling this function. 6889196d8acSJiri Slaby */ 6899196d8acSJiri Slaby static void disable_rsa(struct uart_8250_port *up) 6909196d8acSJiri Slaby { 6919196d8acSJiri Slaby unsigned char mode; 6929196d8acSJiri Slaby int result; 6939196d8acSJiri Slaby 6949196d8acSJiri Slaby if (up->port.type == PORT_RSA && 6959196d8acSJiri Slaby up->port.uartclk == SERIAL_RSA_BAUD_BASE * 16) { 6969196d8acSJiri Slaby spin_lock_irq(&up->port.lock); 6979196d8acSJiri Slaby 6989196d8acSJiri Slaby mode = serial_in(up, UART_RSA_MSR); 6999196d8acSJiri Slaby result = !(mode & UART_RSA_MSR_FIFO); 7009196d8acSJiri Slaby 7019196d8acSJiri Slaby if (!result) { 7029196d8acSJiri Slaby serial_out(up, UART_RSA_MSR, mode & ~UART_RSA_MSR_FIFO); 7039196d8acSJiri Slaby mode = serial_in(up, UART_RSA_MSR); 7049196d8acSJiri Slaby result = !(mode & UART_RSA_MSR_FIFO); 7059196d8acSJiri Slaby } 7069196d8acSJiri Slaby 7079196d8acSJiri Slaby if (result) 7089196d8acSJiri Slaby up->port.uartclk = SERIAL_RSA_BAUD_BASE_LO * 16; 7099196d8acSJiri Slaby spin_unlock_irq(&up->port.lock); 7109196d8acSJiri Slaby } 7119196d8acSJiri Slaby } 7129196d8acSJiri Slaby #endif /* CONFIG_SERIAL_8250_RSA */ 7139196d8acSJiri Slaby 7149196d8acSJiri Slaby /* 7159196d8acSJiri Slaby * This is a quickie test to see how big the FIFO is. 7169196d8acSJiri Slaby * It doesn't work at all the time, more's the pity. 7179196d8acSJiri Slaby */ 7189196d8acSJiri Slaby static int size_fifo(struct uart_8250_port *up) 7199196d8acSJiri Slaby { 7209196d8acSJiri Slaby unsigned char old_fcr, old_mcr, old_lcr; 7219196d8acSJiri Slaby unsigned short old_dl; 7229196d8acSJiri Slaby int count; 7239196d8acSJiri Slaby 7249196d8acSJiri Slaby old_lcr = serial_in(up, UART_LCR); 7259196d8acSJiri Slaby serial_out(up, UART_LCR, 0); 7269196d8acSJiri Slaby old_fcr = serial_in(up, UART_FCR); 7279196d8acSJiri Slaby old_mcr = serial_in(up, UART_MCR); 7289196d8acSJiri Slaby serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO | 7299196d8acSJiri Slaby UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT); 7309196d8acSJiri Slaby serial_out(up, UART_MCR, UART_MCR_LOOP); 7319196d8acSJiri Slaby serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 7329196d8acSJiri Slaby old_dl = serial_dl_read(up); 7339196d8acSJiri Slaby serial_dl_write(up, 0x0001); 7349196d8acSJiri Slaby serial_out(up, UART_LCR, 0x03); 7359196d8acSJiri Slaby for (count = 0; count < 256; count++) 7369196d8acSJiri Slaby serial_out(up, UART_TX, count); 7379196d8acSJiri Slaby mdelay(20);/* FIXME - schedule_timeout */ 7389196d8acSJiri Slaby for (count = 0; (serial_in(up, UART_LSR) & UART_LSR_DR) && 7399196d8acSJiri Slaby (count < 256); count++) 7409196d8acSJiri Slaby serial_in(up, UART_RX); 7419196d8acSJiri Slaby serial_out(up, UART_FCR, old_fcr); 7429196d8acSJiri Slaby serial_out(up, UART_MCR, old_mcr); 7439196d8acSJiri Slaby serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 7449196d8acSJiri Slaby serial_dl_write(up, old_dl); 7459196d8acSJiri Slaby serial_out(up, UART_LCR, old_lcr); 7469196d8acSJiri Slaby 7479196d8acSJiri Slaby return count; 7489196d8acSJiri Slaby } 7499196d8acSJiri Slaby 7509196d8acSJiri Slaby /* 7519196d8acSJiri Slaby * Read UART ID using the divisor method - set DLL and DLM to zero 7529196d8acSJiri Slaby * and the revision will be in DLL and device type in DLM. We 7539196d8acSJiri Slaby * preserve the device state across this. 7549196d8acSJiri Slaby */ 7559196d8acSJiri Slaby static unsigned int autoconfig_read_divisor_id(struct uart_8250_port *p) 7569196d8acSJiri Slaby { 7579196d8acSJiri Slaby unsigned char old_dll, old_dlm, old_lcr; 7589196d8acSJiri Slaby unsigned int id; 7599196d8acSJiri Slaby 7609196d8acSJiri Slaby old_lcr = serial_in(p, UART_LCR); 7619196d8acSJiri Slaby serial_out(p, UART_LCR, UART_LCR_CONF_MODE_A); 7629196d8acSJiri Slaby 7639196d8acSJiri Slaby old_dll = serial_in(p, UART_DLL); 7649196d8acSJiri Slaby old_dlm = serial_in(p, UART_DLM); 7659196d8acSJiri Slaby 7669196d8acSJiri Slaby serial_out(p, UART_DLL, 0); 7679196d8acSJiri Slaby serial_out(p, UART_DLM, 0); 7689196d8acSJiri Slaby 7699196d8acSJiri Slaby id = serial_in(p, UART_DLL) | serial_in(p, UART_DLM) << 8; 7709196d8acSJiri Slaby 7719196d8acSJiri Slaby serial_out(p, UART_DLL, old_dll); 7729196d8acSJiri Slaby serial_out(p, UART_DLM, old_dlm); 7739196d8acSJiri Slaby serial_out(p, UART_LCR, old_lcr); 7749196d8acSJiri Slaby 7759196d8acSJiri Slaby return id; 7769196d8acSJiri Slaby } 7779196d8acSJiri Slaby 7789196d8acSJiri Slaby /* 7799196d8acSJiri Slaby * This is a helper routine to autodetect StarTech/Exar/Oxsemi UART's. 7809196d8acSJiri Slaby * When this function is called we know it is at least a StarTech 7819196d8acSJiri Slaby * 16650 V2, but it might be one of several StarTech UARTs, or one of 7829196d8acSJiri Slaby * its clones. (We treat the broken original StarTech 16650 V1 as a 7839196d8acSJiri Slaby * 16550, and why not? Startech doesn't seem to even acknowledge its 7849196d8acSJiri Slaby * existence.) 7859196d8acSJiri Slaby * 7869196d8acSJiri Slaby * What evil have men's minds wrought... 7879196d8acSJiri Slaby */ 7889196d8acSJiri Slaby static void autoconfig_has_efr(struct uart_8250_port *up) 7899196d8acSJiri Slaby { 7909196d8acSJiri Slaby unsigned int id1, id2, id3, rev; 7919196d8acSJiri Slaby 7929196d8acSJiri Slaby /* 7939196d8acSJiri Slaby * Everything with an EFR has SLEEP 7949196d8acSJiri Slaby */ 7959196d8acSJiri Slaby up->capabilities |= UART_CAP_EFR | UART_CAP_SLEEP; 7969196d8acSJiri Slaby 7979196d8acSJiri Slaby /* 7989196d8acSJiri Slaby * First we check to see if it's an Oxford Semiconductor UART. 7999196d8acSJiri Slaby * 8009196d8acSJiri Slaby * If we have to do this here because some non-National 8019196d8acSJiri Slaby * Semiconductor clone chips lock up if you try writing to the 8029196d8acSJiri Slaby * LSR register (which serial_icr_read does) 8039196d8acSJiri Slaby */ 8049196d8acSJiri Slaby 8059196d8acSJiri Slaby /* 8069196d8acSJiri Slaby * Check for Oxford Semiconductor 16C950. 8079196d8acSJiri Slaby * 8089196d8acSJiri Slaby * EFR [4] must be set else this test fails. 8099196d8acSJiri Slaby * 8109196d8acSJiri Slaby * This shouldn't be necessary, but Mike Hudson (Exoray@isys.ca) 8119196d8acSJiri Slaby * claims that it's needed for 952 dual UART's (which are not 8129196d8acSJiri Slaby * recommended for new designs). 8139196d8acSJiri Slaby */ 8149196d8acSJiri Slaby up->acr = 0; 8159196d8acSJiri Slaby serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 8169196d8acSJiri Slaby serial_out(up, UART_EFR, UART_EFR_ECB); 8179196d8acSJiri Slaby serial_out(up, UART_LCR, 0x00); 8189196d8acSJiri Slaby id1 = serial_icr_read(up, UART_ID1); 8199196d8acSJiri Slaby id2 = serial_icr_read(up, UART_ID2); 8209196d8acSJiri Slaby id3 = serial_icr_read(up, UART_ID3); 8219196d8acSJiri Slaby rev = serial_icr_read(up, UART_REV); 8229196d8acSJiri Slaby 8239196d8acSJiri Slaby DEBUG_AUTOCONF("950id=%02x:%02x:%02x:%02x ", id1, id2, id3, rev); 8249196d8acSJiri Slaby 8259196d8acSJiri Slaby if (id1 == 0x16 && id2 == 0xC9 && 8269196d8acSJiri Slaby (id3 == 0x50 || id3 == 0x52 || id3 == 0x54)) { 8279196d8acSJiri Slaby up->port.type = PORT_16C950; 8289196d8acSJiri Slaby 8299196d8acSJiri Slaby /* 8309196d8acSJiri Slaby * Enable work around for the Oxford Semiconductor 952 rev B 8319196d8acSJiri Slaby * chip which causes it to seriously miscalculate baud rates 8329196d8acSJiri Slaby * when DLL is 0. 8339196d8acSJiri Slaby */ 8349196d8acSJiri Slaby if (id3 == 0x52 && rev == 0x01) 8359196d8acSJiri Slaby up->bugs |= UART_BUG_QUOT; 8369196d8acSJiri Slaby return; 8379196d8acSJiri Slaby } 8389196d8acSJiri Slaby 8399196d8acSJiri Slaby /* 8409196d8acSJiri Slaby * We check for a XR16C850 by setting DLL and DLM to 0, and then 8419196d8acSJiri Slaby * reading back DLL and DLM. The chip type depends on the DLM 8429196d8acSJiri Slaby * value read back: 8439196d8acSJiri Slaby * 0x10 - XR16C850 and the DLL contains the chip revision. 8449196d8acSJiri Slaby * 0x12 - XR16C2850. 8459196d8acSJiri Slaby * 0x14 - XR16C854. 8469196d8acSJiri Slaby */ 8479196d8acSJiri Slaby id1 = autoconfig_read_divisor_id(up); 8489196d8acSJiri Slaby DEBUG_AUTOCONF("850id=%04x ", id1); 8499196d8acSJiri Slaby 8509196d8acSJiri Slaby id2 = id1 >> 8; 8519196d8acSJiri Slaby if (id2 == 0x10 || id2 == 0x12 || id2 == 0x14) { 8529196d8acSJiri Slaby up->port.type = PORT_16850; 8539196d8acSJiri Slaby return; 8549196d8acSJiri Slaby } 8559196d8acSJiri Slaby 8569196d8acSJiri Slaby /* 8579196d8acSJiri Slaby * It wasn't an XR16C850. 8589196d8acSJiri Slaby * 8599196d8acSJiri Slaby * We distinguish between the '654 and the '650 by counting 8609196d8acSJiri Slaby * how many bytes are in the FIFO. I'm using this for now, 8619196d8acSJiri Slaby * since that's the technique that was sent to me in the 8629196d8acSJiri Slaby * serial driver update, but I'm not convinced this works. 8639196d8acSJiri Slaby * I've had problems doing this in the past. -TYT 8649196d8acSJiri Slaby */ 8659196d8acSJiri Slaby if (size_fifo(up) == 64) 8669196d8acSJiri Slaby up->port.type = PORT_16654; 8679196d8acSJiri Slaby else 8689196d8acSJiri Slaby up->port.type = PORT_16650V2; 8699196d8acSJiri Slaby } 8709196d8acSJiri Slaby 8719196d8acSJiri Slaby /* 8729196d8acSJiri Slaby * We detected a chip without a FIFO. Only two fall into 8739196d8acSJiri Slaby * this category - the original 8250 and the 16450. The 8749196d8acSJiri Slaby * 16450 has a scratch register (accessible with LCR=0) 8759196d8acSJiri Slaby */ 8769196d8acSJiri Slaby static void autoconfig_8250(struct uart_8250_port *up) 8779196d8acSJiri Slaby { 8789196d8acSJiri Slaby unsigned char scratch, status1, status2; 8799196d8acSJiri Slaby 8809196d8acSJiri Slaby up->port.type = PORT_8250; 8819196d8acSJiri Slaby 8829196d8acSJiri Slaby scratch = serial_in(up, UART_SCR); 8839196d8acSJiri Slaby serial_out(up, UART_SCR, 0xa5); 8849196d8acSJiri Slaby status1 = serial_in(up, UART_SCR); 8859196d8acSJiri Slaby serial_out(up, UART_SCR, 0x5a); 8869196d8acSJiri Slaby status2 = serial_in(up, UART_SCR); 8879196d8acSJiri Slaby serial_out(up, UART_SCR, scratch); 8889196d8acSJiri Slaby 8899196d8acSJiri Slaby if (status1 == 0xa5 && status2 == 0x5a) 8909196d8acSJiri Slaby up->port.type = PORT_16450; 8919196d8acSJiri Slaby } 8929196d8acSJiri Slaby 8939196d8acSJiri Slaby static int broken_efr(struct uart_8250_port *up) 8949196d8acSJiri Slaby { 8959196d8acSJiri Slaby /* 8969196d8acSJiri Slaby * Exar ST16C2550 "A2" devices incorrectly detect as 8979196d8acSJiri Slaby * having an EFR, and report an ID of 0x0201. See 8989196d8acSJiri Slaby * http://linux.derkeiler.com/Mailing-Lists/Kernel/2004-11/4812.html 8999196d8acSJiri Slaby */ 9009196d8acSJiri Slaby if (autoconfig_read_divisor_id(up) == 0x0201 && size_fifo(up) == 16) 9019196d8acSJiri Slaby return 1; 9029196d8acSJiri Slaby 9039196d8acSJiri Slaby return 0; 9049196d8acSJiri Slaby } 9059196d8acSJiri Slaby 9069196d8acSJiri Slaby /* 9079196d8acSJiri Slaby * We know that the chip has FIFOs. Does it have an EFR? The 9089196d8acSJiri Slaby * EFR is located in the same register position as the IIR and 9099196d8acSJiri Slaby * we know the top two bits of the IIR are currently set. The 9109196d8acSJiri Slaby * EFR should contain zero. Try to read the EFR. 9119196d8acSJiri Slaby */ 9129196d8acSJiri Slaby static void autoconfig_16550a(struct uart_8250_port *up) 9139196d8acSJiri Slaby { 9149196d8acSJiri Slaby unsigned char status1, status2; 9159196d8acSJiri Slaby unsigned int iersave; 9169196d8acSJiri Slaby 9179196d8acSJiri Slaby up->port.type = PORT_16550A; 9189196d8acSJiri Slaby up->capabilities |= UART_CAP_FIFO; 9199196d8acSJiri Slaby 9209196d8acSJiri Slaby /* 9219196d8acSJiri Slaby * XR17V35x UARTs have an extra divisor register, DLD 9229196d8acSJiri Slaby * that gets enabled with when DLAB is set which will 9239196d8acSJiri Slaby * cause the device to incorrectly match and assign 9249196d8acSJiri Slaby * port type to PORT_16650. The EFR for this UART is 9259196d8acSJiri Slaby * found at offset 0x09. Instead check the Deice ID (DVID) 9269196d8acSJiri Slaby * register for a 2, 4 or 8 port UART. 9279196d8acSJiri Slaby */ 9289196d8acSJiri Slaby if (up->port.flags & UPF_EXAR_EFR) { 9299196d8acSJiri Slaby status1 = serial_in(up, UART_EXAR_DVID); 9309196d8acSJiri Slaby if (status1 == 0x82 || status1 == 0x84 || status1 == 0x88) { 9319196d8acSJiri Slaby DEBUG_AUTOCONF("Exar XR17V35x "); 9329196d8acSJiri Slaby up->port.type = PORT_XR17V35X; 9339196d8acSJiri Slaby up->capabilities |= UART_CAP_AFE | UART_CAP_EFR | 9349196d8acSJiri Slaby UART_CAP_SLEEP; 9359196d8acSJiri Slaby 9369196d8acSJiri Slaby return; 9379196d8acSJiri Slaby } 9389196d8acSJiri Slaby 9399196d8acSJiri Slaby } 9409196d8acSJiri Slaby 9419196d8acSJiri Slaby /* 9429196d8acSJiri Slaby * Check for presence of the EFR when DLAB is set. 9439196d8acSJiri Slaby * Only ST16C650V1 UARTs pass this test. 9449196d8acSJiri Slaby */ 9459196d8acSJiri Slaby serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 9469196d8acSJiri Slaby if (serial_in(up, UART_EFR) == 0) { 9479196d8acSJiri Slaby serial_out(up, UART_EFR, 0xA8); 9489196d8acSJiri Slaby if (serial_in(up, UART_EFR) != 0) { 9499196d8acSJiri Slaby DEBUG_AUTOCONF("EFRv1 "); 9509196d8acSJiri Slaby up->port.type = PORT_16650; 9519196d8acSJiri Slaby up->capabilities |= UART_CAP_EFR | UART_CAP_SLEEP; 9529196d8acSJiri Slaby } else { 953fddceb8bSVijay Rai serial_out(up, UART_LCR, 0); 954fddceb8bSVijay Rai serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO | 955fddceb8bSVijay Rai UART_FCR7_64BYTE); 956fddceb8bSVijay Rai status1 = serial_in(up, UART_IIR) >> 5; 957fddceb8bSVijay Rai serial_out(up, UART_FCR, 0); 958fddceb8bSVijay Rai serial_out(up, UART_LCR, 0); 959fddceb8bSVijay Rai 960fddceb8bSVijay Rai if (status1 == 7) 961fddceb8bSVijay Rai up->port.type = PORT_16550A_FSL64; 962fddceb8bSVijay Rai else 9639196d8acSJiri Slaby DEBUG_AUTOCONF("Motorola 8xxx DUART "); 9649196d8acSJiri Slaby } 9659196d8acSJiri Slaby serial_out(up, UART_EFR, 0); 9669196d8acSJiri Slaby return; 9679196d8acSJiri Slaby } 9689196d8acSJiri Slaby 9699196d8acSJiri Slaby /* 9709196d8acSJiri Slaby * Maybe it requires 0xbf to be written to the LCR. 9719196d8acSJiri Slaby * (other ST16C650V2 UARTs, TI16C752A, etc) 9729196d8acSJiri Slaby */ 9739196d8acSJiri Slaby serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 9749196d8acSJiri Slaby if (serial_in(up, UART_EFR) == 0 && !broken_efr(up)) { 9759196d8acSJiri Slaby DEBUG_AUTOCONF("EFRv2 "); 9769196d8acSJiri Slaby autoconfig_has_efr(up); 9779196d8acSJiri Slaby return; 9789196d8acSJiri Slaby } 9799196d8acSJiri Slaby 9809196d8acSJiri Slaby /* 9819196d8acSJiri Slaby * Check for a National Semiconductor SuperIO chip. 9829196d8acSJiri Slaby * Attempt to switch to bank 2, read the value of the LOOP bit 9839196d8acSJiri Slaby * from EXCR1. Switch back to bank 0, change it in MCR. Then 9849196d8acSJiri Slaby * switch back to bank 2, read it from EXCR1 again and check 9859196d8acSJiri Slaby * it's changed. If so, set baud_base in EXCR2 to 921600. -- dwmw2 9869196d8acSJiri Slaby */ 9879196d8acSJiri Slaby serial_out(up, UART_LCR, 0); 9889196d8acSJiri Slaby status1 = serial_in(up, UART_MCR); 9899196d8acSJiri Slaby serial_out(up, UART_LCR, 0xE0); 9909196d8acSJiri Slaby status2 = serial_in(up, 0x02); /* EXCR1 */ 9919196d8acSJiri Slaby 9929196d8acSJiri Slaby if (!((status2 ^ status1) & UART_MCR_LOOP)) { 9939196d8acSJiri Slaby serial_out(up, UART_LCR, 0); 9949196d8acSJiri Slaby serial_out(up, UART_MCR, status1 ^ UART_MCR_LOOP); 9959196d8acSJiri Slaby serial_out(up, UART_LCR, 0xE0); 9969196d8acSJiri Slaby status2 = serial_in(up, 0x02); /* EXCR1 */ 9979196d8acSJiri Slaby serial_out(up, UART_LCR, 0); 9989196d8acSJiri Slaby serial_out(up, UART_MCR, status1); 9999196d8acSJiri Slaby 10009196d8acSJiri Slaby if ((status2 ^ status1) & UART_MCR_LOOP) { 10019196d8acSJiri Slaby unsigned short quot; 10029196d8acSJiri Slaby 10039196d8acSJiri Slaby serial_out(up, UART_LCR, 0xE0); 10049196d8acSJiri Slaby 10059196d8acSJiri Slaby quot = serial_dl_read(up); 10069196d8acSJiri Slaby quot <<= 3; 10079196d8acSJiri Slaby 10089196d8acSJiri Slaby if (ns16550a_goto_highspeed(up)) 10099196d8acSJiri Slaby serial_dl_write(up, quot); 10109196d8acSJiri Slaby 10119196d8acSJiri Slaby serial_out(up, UART_LCR, 0); 10129196d8acSJiri Slaby 10139196d8acSJiri Slaby up->port.uartclk = 921600*16; 10149196d8acSJiri Slaby up->port.type = PORT_NS16550A; 10159196d8acSJiri Slaby up->capabilities |= UART_NATSEMI; 10169196d8acSJiri Slaby return; 10179196d8acSJiri Slaby } 10189196d8acSJiri Slaby } 10199196d8acSJiri Slaby 10209196d8acSJiri Slaby /* 10219196d8acSJiri Slaby * No EFR. Try to detect a TI16750, which only sets bit 5 of 10229196d8acSJiri Slaby * the IIR when 64 byte FIFO mode is enabled when DLAB is set. 10239196d8acSJiri Slaby * Try setting it with and without DLAB set. Cheap clones 10249196d8acSJiri Slaby * set bit 5 without DLAB set. 10259196d8acSJiri Slaby */ 10269196d8acSJiri Slaby serial_out(up, UART_LCR, 0); 10279196d8acSJiri Slaby serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO | UART_FCR7_64BYTE); 10289196d8acSJiri Slaby status1 = serial_in(up, UART_IIR) >> 5; 10299196d8acSJiri Slaby serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO); 10309196d8acSJiri Slaby serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); 10319196d8acSJiri Slaby serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO | UART_FCR7_64BYTE); 10329196d8acSJiri Slaby status2 = serial_in(up, UART_IIR) >> 5; 10339196d8acSJiri Slaby serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO); 10349196d8acSJiri Slaby serial_out(up, UART_LCR, 0); 10359196d8acSJiri Slaby 10369196d8acSJiri Slaby DEBUG_AUTOCONF("iir1=%d iir2=%d ", status1, status2); 10379196d8acSJiri Slaby 10389196d8acSJiri Slaby if (status1 == 6 && status2 == 7) { 10399196d8acSJiri Slaby up->port.type = PORT_16750; 10409196d8acSJiri Slaby up->capabilities |= UART_CAP_AFE | UART_CAP_SLEEP; 10419196d8acSJiri Slaby return; 10429196d8acSJiri Slaby } 10439196d8acSJiri Slaby 10449196d8acSJiri Slaby /* 10459196d8acSJiri Slaby * Try writing and reading the UART_IER_UUE bit (b6). 10469196d8acSJiri Slaby * If it works, this is probably one of the Xscale platform's 10479196d8acSJiri Slaby * internal UARTs. 10489196d8acSJiri Slaby * We're going to explicitly set the UUE bit to 0 before 10499196d8acSJiri Slaby * trying to write and read a 1 just to make sure it's not 10509196d8acSJiri Slaby * already a 1 and maybe locked there before we even start start. 10519196d8acSJiri Slaby */ 10529196d8acSJiri Slaby iersave = serial_in(up, UART_IER); 10539196d8acSJiri Slaby serial_out(up, UART_IER, iersave & ~UART_IER_UUE); 10549196d8acSJiri Slaby if (!(serial_in(up, UART_IER) & UART_IER_UUE)) { 10559196d8acSJiri Slaby /* 10569196d8acSJiri Slaby * OK it's in a known zero state, try writing and reading 10579196d8acSJiri Slaby * without disturbing the current state of the other bits. 10589196d8acSJiri Slaby */ 10599196d8acSJiri Slaby serial_out(up, UART_IER, iersave | UART_IER_UUE); 10609196d8acSJiri Slaby if (serial_in(up, UART_IER) & UART_IER_UUE) { 10619196d8acSJiri Slaby /* 10629196d8acSJiri Slaby * It's an Xscale. 10639196d8acSJiri Slaby * We'll leave the UART_IER_UUE bit set to 1 (enabled). 10649196d8acSJiri Slaby */ 10659196d8acSJiri Slaby DEBUG_AUTOCONF("Xscale "); 10669196d8acSJiri Slaby up->port.type = PORT_XSCALE; 10679196d8acSJiri Slaby up->capabilities |= UART_CAP_UUE | UART_CAP_RTOIE; 10689196d8acSJiri Slaby return; 10699196d8acSJiri Slaby } 10709196d8acSJiri Slaby } else { 10719196d8acSJiri Slaby /* 10729196d8acSJiri Slaby * If we got here we couldn't force the IER_UUE bit to 0. 10739196d8acSJiri Slaby * Log it and continue. 10749196d8acSJiri Slaby */ 10759196d8acSJiri Slaby DEBUG_AUTOCONF("Couldn't force IER_UUE to 0 "); 10769196d8acSJiri Slaby } 10779196d8acSJiri Slaby serial_out(up, UART_IER, iersave); 10789196d8acSJiri Slaby 10799196d8acSJiri Slaby /* 10809196d8acSJiri Slaby * Exar uarts have EFR in a weird location 10819196d8acSJiri Slaby */ 10829196d8acSJiri Slaby if (up->port.flags & UPF_EXAR_EFR) { 10839196d8acSJiri Slaby DEBUG_AUTOCONF("Exar XR17D15x "); 10849196d8acSJiri Slaby up->port.type = PORT_XR17D15X; 10859196d8acSJiri Slaby up->capabilities |= UART_CAP_AFE | UART_CAP_EFR | 10869196d8acSJiri Slaby UART_CAP_SLEEP; 10879196d8acSJiri Slaby 10889196d8acSJiri Slaby return; 10899196d8acSJiri Slaby } 10909196d8acSJiri Slaby 10919196d8acSJiri Slaby /* 10929196d8acSJiri Slaby * We distinguish between 16550A and U6 16550A by counting 10939196d8acSJiri Slaby * how many bytes are in the FIFO. 10949196d8acSJiri Slaby */ 10959196d8acSJiri Slaby if (up->port.type == PORT_16550A && size_fifo(up) == 64) { 10969196d8acSJiri Slaby up->port.type = PORT_U6_16550A; 10979196d8acSJiri Slaby up->capabilities |= UART_CAP_AFE; 10989196d8acSJiri Slaby } 10999196d8acSJiri Slaby } 11009196d8acSJiri Slaby 11019196d8acSJiri Slaby /* 11029196d8acSJiri Slaby * This routine is called by rs_init() to initialize a specific serial 11039196d8acSJiri Slaby * port. It determines what type of UART chip this serial port is 11049196d8acSJiri Slaby * using: 8250, 16450, 16550, 16550A. The important question is 11059196d8acSJiri Slaby * whether or not this UART is a 16550A or not, since this will 11069196d8acSJiri Slaby * determine whether or not we can use its FIFO features or not. 11079196d8acSJiri Slaby */ 11089196d8acSJiri Slaby static void autoconfig(struct uart_8250_port *up, unsigned int probeflags) 11099196d8acSJiri Slaby { 11109196d8acSJiri Slaby unsigned char status1, scratch, scratch2, scratch3; 11119196d8acSJiri Slaby unsigned char save_lcr, save_mcr; 11129196d8acSJiri Slaby struct uart_port *port = &up->port; 11139196d8acSJiri Slaby unsigned long flags; 11149196d8acSJiri Slaby unsigned int old_capabilities; 11159196d8acSJiri Slaby 11169196d8acSJiri Slaby if (!port->iobase && !port->mapbase && !port->membase) 11179196d8acSJiri Slaby return; 11189196d8acSJiri Slaby 11199196d8acSJiri Slaby DEBUG_AUTOCONF("ttyS%d: autoconf (0x%04lx, 0x%p): ", 11209196d8acSJiri Slaby serial_index(port), port->iobase, port->membase); 11219196d8acSJiri Slaby 11229196d8acSJiri Slaby /* 11239196d8acSJiri Slaby * We really do need global IRQs disabled here - we're going to 11249196d8acSJiri Slaby * be frobbing the chips IRQ enable register to see if it exists. 11259196d8acSJiri Slaby */ 11269196d8acSJiri Slaby spin_lock_irqsave(&port->lock, flags); 11279196d8acSJiri Slaby 11289196d8acSJiri Slaby up->capabilities = 0; 11299196d8acSJiri Slaby up->bugs = 0; 11309196d8acSJiri Slaby 11319196d8acSJiri Slaby if (!(port->flags & UPF_BUGGY_UART)) { 11329196d8acSJiri Slaby /* 11339196d8acSJiri Slaby * Do a simple existence test first; if we fail this, 11349196d8acSJiri Slaby * there's no point trying anything else. 11359196d8acSJiri Slaby * 11369196d8acSJiri Slaby * 0x80 is used as a nonsense port to prevent against 11379196d8acSJiri Slaby * false positives due to ISA bus float. The 11389196d8acSJiri Slaby * assumption is that 0x80 is a non-existent port; 11399196d8acSJiri Slaby * which should be safe since include/asm/io.h also 11409196d8acSJiri Slaby * makes this assumption. 11419196d8acSJiri Slaby * 11429196d8acSJiri Slaby * Note: this is safe as long as MCR bit 4 is clear 11439196d8acSJiri Slaby * and the device is in "PC" mode. 11449196d8acSJiri Slaby */ 11459196d8acSJiri Slaby scratch = serial_in(up, UART_IER); 11469196d8acSJiri Slaby serial_out(up, UART_IER, 0); 11479196d8acSJiri Slaby #ifdef __i386__ 11489196d8acSJiri Slaby outb(0xff, 0x080); 11499196d8acSJiri Slaby #endif 11509196d8acSJiri Slaby /* 11519196d8acSJiri Slaby * Mask out IER[7:4] bits for test as some UARTs (e.g. TL 11529196d8acSJiri Slaby * 16C754B) allow only to modify them if an EFR bit is set. 11539196d8acSJiri Slaby */ 11549196d8acSJiri Slaby scratch2 = serial_in(up, UART_IER) & 0x0f; 11559196d8acSJiri Slaby serial_out(up, UART_IER, 0x0F); 11569196d8acSJiri Slaby #ifdef __i386__ 11579196d8acSJiri Slaby outb(0, 0x080); 11589196d8acSJiri Slaby #endif 11599196d8acSJiri Slaby scratch3 = serial_in(up, UART_IER) & 0x0f; 11609196d8acSJiri Slaby serial_out(up, UART_IER, scratch); 11619196d8acSJiri Slaby if (scratch2 != 0 || scratch3 != 0x0F) { 11629196d8acSJiri Slaby /* 11639196d8acSJiri Slaby * We failed; there's nothing here 11649196d8acSJiri Slaby */ 11659196d8acSJiri Slaby spin_unlock_irqrestore(&port->lock, flags); 11669196d8acSJiri Slaby DEBUG_AUTOCONF("IER test failed (%02x, %02x) ", 11679196d8acSJiri Slaby scratch2, scratch3); 11689196d8acSJiri Slaby goto out; 11699196d8acSJiri Slaby } 11709196d8acSJiri Slaby } 11719196d8acSJiri Slaby 11729196d8acSJiri Slaby save_mcr = serial_in(up, UART_MCR); 11739196d8acSJiri Slaby save_lcr = serial_in(up, UART_LCR); 11749196d8acSJiri Slaby 11759196d8acSJiri Slaby /* 11769196d8acSJiri Slaby * Check to see if a UART is really there. Certain broken 11779196d8acSJiri Slaby * internal modems based on the Rockwell chipset fail this 11789196d8acSJiri Slaby * test, because they apparently don't implement the loopback 11799196d8acSJiri Slaby * test mode. So this test is skipped on the COM 1 through 11809196d8acSJiri Slaby * COM 4 ports. This *should* be safe, since no board 11819196d8acSJiri Slaby * manufacturer would be stupid enough to design a board 11829196d8acSJiri Slaby * that conflicts with COM 1-4 --- we hope! 11839196d8acSJiri Slaby */ 11849196d8acSJiri Slaby if (!(port->flags & UPF_SKIP_TEST)) { 11859196d8acSJiri Slaby serial_out(up, UART_MCR, UART_MCR_LOOP | 0x0A); 11869196d8acSJiri Slaby status1 = serial_in(up, UART_MSR) & 0xF0; 11879196d8acSJiri Slaby serial_out(up, UART_MCR, save_mcr); 11889196d8acSJiri Slaby if (status1 != 0x90) { 11899196d8acSJiri Slaby spin_unlock_irqrestore(&port->lock, flags); 11909196d8acSJiri Slaby DEBUG_AUTOCONF("LOOP test failed (%02x) ", 11919196d8acSJiri Slaby status1); 11929196d8acSJiri Slaby goto out; 11939196d8acSJiri Slaby } 11949196d8acSJiri Slaby } 11959196d8acSJiri Slaby 11969196d8acSJiri Slaby /* 11979196d8acSJiri Slaby * We're pretty sure there's a port here. Lets find out what 11989196d8acSJiri Slaby * type of port it is. The IIR top two bits allows us to find 11999196d8acSJiri Slaby * out if it's 8250 or 16450, 16550, 16550A or later. This 12009196d8acSJiri Slaby * determines what we test for next. 12019196d8acSJiri Slaby * 12029196d8acSJiri Slaby * We also initialise the EFR (if any) to zero for later. The 12039196d8acSJiri Slaby * EFR occupies the same register location as the FCR and IIR. 12049196d8acSJiri Slaby */ 12059196d8acSJiri Slaby serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 12069196d8acSJiri Slaby serial_out(up, UART_EFR, 0); 12079196d8acSJiri Slaby serial_out(up, UART_LCR, 0); 12089196d8acSJiri Slaby 12099196d8acSJiri Slaby serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO); 12109196d8acSJiri Slaby scratch = serial_in(up, UART_IIR) >> 6; 12119196d8acSJiri Slaby 12129196d8acSJiri Slaby switch (scratch) { 12139196d8acSJiri Slaby case 0: 12149196d8acSJiri Slaby autoconfig_8250(up); 12159196d8acSJiri Slaby break; 12169196d8acSJiri Slaby case 1: 12179196d8acSJiri Slaby port->type = PORT_UNKNOWN; 12189196d8acSJiri Slaby break; 12199196d8acSJiri Slaby case 2: 12209196d8acSJiri Slaby port->type = PORT_16550; 12219196d8acSJiri Slaby break; 12229196d8acSJiri Slaby case 3: 12239196d8acSJiri Slaby autoconfig_16550a(up); 12249196d8acSJiri Slaby break; 12259196d8acSJiri Slaby } 12269196d8acSJiri Slaby 12279196d8acSJiri Slaby #ifdef CONFIG_SERIAL_8250_RSA 12289196d8acSJiri Slaby /* 12299196d8acSJiri Slaby * Only probe for RSA ports if we got the region. 12309196d8acSJiri Slaby */ 12319196d8acSJiri Slaby if (port->type == PORT_16550A && probeflags & PROBE_RSA) { 12329196d8acSJiri Slaby int i; 12339196d8acSJiri Slaby 12349196d8acSJiri Slaby for (i = 0 ; i < probe_rsa_count; ++i) { 12359196d8acSJiri Slaby if (probe_rsa[i] == port->iobase && __enable_rsa(up)) { 12369196d8acSJiri Slaby port->type = PORT_RSA; 12379196d8acSJiri Slaby break; 12389196d8acSJiri Slaby } 12399196d8acSJiri Slaby } 12409196d8acSJiri Slaby } 12419196d8acSJiri Slaby #endif 12429196d8acSJiri Slaby 12439196d8acSJiri Slaby serial_out(up, UART_LCR, save_lcr); 12449196d8acSJiri Slaby 12459196d8acSJiri Slaby port->fifosize = uart_config[up->port.type].fifo_size; 12469196d8acSJiri Slaby old_capabilities = up->capabilities; 12479196d8acSJiri Slaby up->capabilities = uart_config[port->type].flags; 12489196d8acSJiri Slaby up->tx_loadsz = uart_config[port->type].tx_loadsz; 12499196d8acSJiri Slaby 12509196d8acSJiri Slaby if (port->type == PORT_UNKNOWN) 12519196d8acSJiri Slaby goto out_lock; 12529196d8acSJiri Slaby 12539196d8acSJiri Slaby /* 12549196d8acSJiri Slaby * Reset the UART. 12559196d8acSJiri Slaby */ 12569196d8acSJiri Slaby #ifdef CONFIG_SERIAL_8250_RSA 12579196d8acSJiri Slaby if (port->type == PORT_RSA) 12589196d8acSJiri Slaby serial_out(up, UART_RSA_FRR, 0); 12599196d8acSJiri Slaby #endif 12609196d8acSJiri Slaby serial_out(up, UART_MCR, save_mcr); 12619196d8acSJiri Slaby serial8250_clear_fifos(up); 12629196d8acSJiri Slaby serial_in(up, UART_RX); 12639196d8acSJiri Slaby if (up->capabilities & UART_CAP_UUE) 12649196d8acSJiri Slaby serial_out(up, UART_IER, UART_IER_UUE); 12659196d8acSJiri Slaby else 12669196d8acSJiri Slaby serial_out(up, UART_IER, 0); 12679196d8acSJiri Slaby 12689196d8acSJiri Slaby out_lock: 12699196d8acSJiri Slaby spin_unlock_irqrestore(&port->lock, flags); 12709196d8acSJiri Slaby if (up->capabilities != old_capabilities) { 12719196d8acSJiri Slaby printk(KERN_WARNING 12729196d8acSJiri Slaby "ttyS%d: detected caps %08x should be %08x\n", 12739196d8acSJiri Slaby serial_index(port), old_capabilities, 12749196d8acSJiri Slaby up->capabilities); 12759196d8acSJiri Slaby } 12769196d8acSJiri Slaby out: 12779196d8acSJiri Slaby DEBUG_AUTOCONF("iir=%d ", scratch); 12789196d8acSJiri Slaby DEBUG_AUTOCONF("type=%s\n", uart_config[port->type].name); 12799196d8acSJiri Slaby } 12809196d8acSJiri Slaby 12819196d8acSJiri Slaby static void autoconfig_irq(struct uart_8250_port *up) 12829196d8acSJiri Slaby { 12839196d8acSJiri Slaby struct uart_port *port = &up->port; 12849196d8acSJiri Slaby unsigned char save_mcr, save_ier; 12859196d8acSJiri Slaby unsigned char save_ICP = 0; 12869196d8acSJiri Slaby unsigned int ICP = 0; 12879196d8acSJiri Slaby unsigned long irqs; 12889196d8acSJiri Slaby int irq; 12899196d8acSJiri Slaby 12909196d8acSJiri Slaby if (port->flags & UPF_FOURPORT) { 12919196d8acSJiri Slaby ICP = (port->iobase & 0xfe0) | 0x1f; 12929196d8acSJiri Slaby save_ICP = inb_p(ICP); 12939196d8acSJiri Slaby outb_p(0x80, ICP); 12949196d8acSJiri Slaby inb_p(ICP); 12959196d8acSJiri Slaby } 12969196d8acSJiri Slaby 12979196d8acSJiri Slaby /* forget possible initially masked and pending IRQ */ 12989196d8acSJiri Slaby probe_irq_off(probe_irq_on()); 12999196d8acSJiri Slaby save_mcr = serial_in(up, UART_MCR); 13009196d8acSJiri Slaby save_ier = serial_in(up, UART_IER); 13019196d8acSJiri Slaby serial_out(up, UART_MCR, UART_MCR_OUT1 | UART_MCR_OUT2); 13029196d8acSJiri Slaby 13039196d8acSJiri Slaby irqs = probe_irq_on(); 13049196d8acSJiri Slaby serial_out(up, UART_MCR, 0); 13059196d8acSJiri Slaby udelay(10); 13069196d8acSJiri Slaby if (port->flags & UPF_FOURPORT) { 13079196d8acSJiri Slaby serial_out(up, UART_MCR, 13089196d8acSJiri Slaby UART_MCR_DTR | UART_MCR_RTS); 13099196d8acSJiri Slaby } else { 13109196d8acSJiri Slaby serial_out(up, UART_MCR, 13119196d8acSJiri Slaby UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2); 13129196d8acSJiri Slaby } 13139196d8acSJiri Slaby serial_out(up, UART_IER, 0x0f); /* enable all intrs */ 13149196d8acSJiri Slaby serial_in(up, UART_LSR); 13159196d8acSJiri Slaby serial_in(up, UART_RX); 13169196d8acSJiri Slaby serial_in(up, UART_IIR); 13179196d8acSJiri Slaby serial_in(up, UART_MSR); 13189196d8acSJiri Slaby serial_out(up, UART_TX, 0xFF); 13199196d8acSJiri Slaby udelay(20); 13209196d8acSJiri Slaby irq = probe_irq_off(irqs); 13219196d8acSJiri Slaby 13229196d8acSJiri Slaby serial_out(up, UART_MCR, save_mcr); 13239196d8acSJiri Slaby serial_out(up, UART_IER, save_ier); 13249196d8acSJiri Slaby 13259196d8acSJiri Slaby if (port->flags & UPF_FOURPORT) 13269196d8acSJiri Slaby outb_p(save_ICP, ICP); 13279196d8acSJiri Slaby 13289196d8acSJiri Slaby port->irq = (irq > 0) ? irq : 0; 13299196d8acSJiri Slaby } 13309196d8acSJiri Slaby 13319196d8acSJiri Slaby static inline void __stop_tx(struct uart_8250_port *p) 13329196d8acSJiri Slaby { 13339196d8acSJiri Slaby if (p->ier & UART_IER_THRI) { 13349196d8acSJiri Slaby p->ier &= ~UART_IER_THRI; 13359196d8acSJiri Slaby serial_out(p, UART_IER, p->ier); 1336d74d5d1bSSebastian Andrzej Siewior serial8250_rpm_put_tx(p); 13379196d8acSJiri Slaby } 13389196d8acSJiri Slaby } 13399196d8acSJiri Slaby 13409196d8acSJiri Slaby static void serial8250_stop_tx(struct uart_port *port) 13419196d8acSJiri Slaby { 1342b1261c86SAndy Shevchenko struct uart_8250_port *up = up_to_u8250p(port); 13439196d8acSJiri Slaby 1344d74d5d1bSSebastian Andrzej Siewior serial8250_rpm_get(up); 13459196d8acSJiri Slaby __stop_tx(up); 13469196d8acSJiri Slaby 13479196d8acSJiri Slaby /* 13489196d8acSJiri Slaby * We really want to stop the transmitter from sending. 13499196d8acSJiri Slaby */ 13509196d8acSJiri Slaby if (port->type == PORT_16C950) { 13519196d8acSJiri Slaby up->acr |= UART_ACR_TXDIS; 13529196d8acSJiri Slaby serial_icr_write(up, UART_ACR, up->acr); 13539196d8acSJiri Slaby } 1354d74d5d1bSSebastian Andrzej Siewior serial8250_rpm_put(up); 13559196d8acSJiri Slaby } 13569196d8acSJiri Slaby 13579196d8acSJiri Slaby static void serial8250_start_tx(struct uart_port *port) 13589196d8acSJiri Slaby { 1359b1261c86SAndy Shevchenko struct uart_8250_port *up = up_to_u8250p(port); 13609196d8acSJiri Slaby 1361d74d5d1bSSebastian Andrzej Siewior serial8250_rpm_get_tx(up); 1362a39d1da1SAndy Shevchenko 1363a39d1da1SAndy Shevchenko if (up->dma && !up->dma->tx_dma(up)) 13649196d8acSJiri Slaby return; 1365a39d1da1SAndy Shevchenko 1366a39d1da1SAndy Shevchenko if (!(up->ier & UART_IER_THRI)) { 13679196d8acSJiri Slaby up->ier |= UART_IER_THRI; 13689196d8acSJiri Slaby serial_port_out(port, UART_IER, up->ier); 13699196d8acSJiri Slaby 13709196d8acSJiri Slaby if (up->bugs & UART_BUG_TXEN) { 13719196d8acSJiri Slaby unsigned char lsr; 13729196d8acSJiri Slaby lsr = serial_in(up, UART_LSR); 13739196d8acSJiri Slaby up->lsr_saved_flags |= lsr & LSR_SAVE_FLAGS; 1374c09babfaSPeter Hurley if (lsr & UART_LSR_THRE) 13759196d8acSJiri Slaby serial8250_tx_chars(up); 13769196d8acSJiri Slaby } 13779196d8acSJiri Slaby } 13789196d8acSJiri Slaby 13799196d8acSJiri Slaby /* 13809196d8acSJiri Slaby * Re-enable the transmitter if we disabled it. 13819196d8acSJiri Slaby */ 13829196d8acSJiri Slaby if (port->type == PORT_16C950 && up->acr & UART_ACR_TXDIS) { 13839196d8acSJiri Slaby up->acr &= ~UART_ACR_TXDIS; 13849196d8acSJiri Slaby serial_icr_write(up, UART_ACR, up->acr); 13859196d8acSJiri Slaby } 13869196d8acSJiri Slaby } 13879196d8acSJiri Slaby 1388234abab1SSebastian Andrzej Siewior static void serial8250_throttle(struct uart_port *port) 1389234abab1SSebastian Andrzej Siewior { 1390234abab1SSebastian Andrzej Siewior port->throttle(port); 1391234abab1SSebastian Andrzej Siewior } 1392234abab1SSebastian Andrzej Siewior 1393234abab1SSebastian Andrzej Siewior static void serial8250_unthrottle(struct uart_port *port) 1394234abab1SSebastian Andrzej Siewior { 1395234abab1SSebastian Andrzej Siewior port->unthrottle(port); 1396234abab1SSebastian Andrzej Siewior } 1397234abab1SSebastian Andrzej Siewior 13989196d8acSJiri Slaby static void serial8250_stop_rx(struct uart_port *port) 13999196d8acSJiri Slaby { 1400b1261c86SAndy Shevchenko struct uart_8250_port *up = up_to_u8250p(port); 14019196d8acSJiri Slaby 1402d74d5d1bSSebastian Andrzej Siewior serial8250_rpm_get(up); 1403d74d5d1bSSebastian Andrzej Siewior 14049137568eSSebastian Andrzej Siewior up->ier &= ~(UART_IER_RLSI | UART_IER_RDI); 14059196d8acSJiri Slaby up->port.read_status_mask &= ~UART_LSR_DR; 14069196d8acSJiri Slaby serial_port_out(port, UART_IER, up->ier); 1407d74d5d1bSSebastian Andrzej Siewior 1408d74d5d1bSSebastian Andrzej Siewior serial8250_rpm_put(up); 14099196d8acSJiri Slaby } 14109196d8acSJiri Slaby 1411cab68f89SPeter Hurley static void serial8250_disable_ms(struct uart_port *port) 1412cab68f89SPeter Hurley { 1413cab68f89SPeter Hurley struct uart_8250_port *up = 1414cab68f89SPeter Hurley container_of(port, struct uart_8250_port, port); 1415cab68f89SPeter Hurley 1416cab68f89SPeter Hurley /* no MSR capabilities */ 1417cab68f89SPeter Hurley if (up->bugs & UART_BUG_NOMSR) 1418cab68f89SPeter Hurley return; 1419cab68f89SPeter Hurley 1420cab68f89SPeter Hurley up->ier &= ~UART_IER_MSI; 1421cab68f89SPeter Hurley serial_port_out(port, UART_IER, up->ier); 1422cab68f89SPeter Hurley } 1423cab68f89SPeter Hurley 14249196d8acSJiri Slaby static void serial8250_enable_ms(struct uart_port *port) 14259196d8acSJiri Slaby { 1426b1261c86SAndy Shevchenko struct uart_8250_port *up = up_to_u8250p(port); 14279196d8acSJiri Slaby 14289196d8acSJiri Slaby /* no MSR capabilities */ 14299196d8acSJiri Slaby if (up->bugs & UART_BUG_NOMSR) 14309196d8acSJiri Slaby return; 14319196d8acSJiri Slaby 14329196d8acSJiri Slaby up->ier |= UART_IER_MSI; 1433d74d5d1bSSebastian Andrzej Siewior 1434d74d5d1bSSebastian Andrzej Siewior serial8250_rpm_get(up); 14359196d8acSJiri Slaby serial_port_out(port, UART_IER, up->ier); 1436d74d5d1bSSebastian Andrzej Siewior serial8250_rpm_put(up); 14379196d8acSJiri Slaby } 14389196d8acSJiri Slaby 14399196d8acSJiri Slaby /* 14409196d8acSJiri Slaby * serial8250_rx_chars: processes according to the passed in LSR 14419196d8acSJiri Slaby * value, and returns the remaining LSR bits not handled 14429196d8acSJiri Slaby * by this Rx routine. 14439196d8acSJiri Slaby */ 14449196d8acSJiri Slaby unsigned char 14459196d8acSJiri Slaby serial8250_rx_chars(struct uart_8250_port *up, unsigned char lsr) 14469196d8acSJiri Slaby { 14479196d8acSJiri Slaby struct uart_port *port = &up->port; 14489196d8acSJiri Slaby unsigned char ch; 14499196d8acSJiri Slaby int max_count = 256; 14509196d8acSJiri Slaby char flag; 14519196d8acSJiri Slaby 14529196d8acSJiri Slaby do { 14539196d8acSJiri Slaby if (likely(lsr & UART_LSR_DR)) 14549196d8acSJiri Slaby ch = serial_in(up, UART_RX); 14559196d8acSJiri Slaby else 14569196d8acSJiri Slaby /* 14579196d8acSJiri Slaby * Intel 82571 has a Serial Over Lan device that will 14589196d8acSJiri Slaby * set UART_LSR_BI without setting UART_LSR_DR when 14599196d8acSJiri Slaby * it receives a break. To avoid reading from the 14609196d8acSJiri Slaby * receive buffer without UART_LSR_DR bit set, we 14619196d8acSJiri Slaby * just force the read character to be 0 14629196d8acSJiri Slaby */ 14639196d8acSJiri Slaby ch = 0; 14649196d8acSJiri Slaby 14659196d8acSJiri Slaby flag = TTY_NORMAL; 14669196d8acSJiri Slaby port->icount.rx++; 14679196d8acSJiri Slaby 14689196d8acSJiri Slaby lsr |= up->lsr_saved_flags; 14699196d8acSJiri Slaby up->lsr_saved_flags = 0; 14709196d8acSJiri Slaby 14719196d8acSJiri Slaby if (unlikely(lsr & UART_LSR_BRK_ERROR_BITS)) { 14729196d8acSJiri Slaby if (lsr & UART_LSR_BI) { 14739196d8acSJiri Slaby lsr &= ~(UART_LSR_FE | UART_LSR_PE); 14749196d8acSJiri Slaby port->icount.brk++; 14759196d8acSJiri Slaby /* 14769196d8acSJiri Slaby * We do the SysRQ and SAK checking 14779196d8acSJiri Slaby * here because otherwise the break 14789196d8acSJiri Slaby * may get masked by ignore_status_mask 14799196d8acSJiri Slaby * or read_status_mask. 14809196d8acSJiri Slaby */ 14819196d8acSJiri Slaby if (uart_handle_break(port)) 14829196d8acSJiri Slaby goto ignore_char; 14839196d8acSJiri Slaby } else if (lsr & UART_LSR_PE) 14849196d8acSJiri Slaby port->icount.parity++; 14859196d8acSJiri Slaby else if (lsr & UART_LSR_FE) 14869196d8acSJiri Slaby port->icount.frame++; 14879196d8acSJiri Slaby if (lsr & UART_LSR_OE) 14889196d8acSJiri Slaby port->icount.overrun++; 14899196d8acSJiri Slaby 14909196d8acSJiri Slaby /* 14919196d8acSJiri Slaby * Mask off conditions which should be ignored. 14929196d8acSJiri Slaby */ 14939196d8acSJiri Slaby lsr &= port->read_status_mask; 14949196d8acSJiri Slaby 14959196d8acSJiri Slaby if (lsr & UART_LSR_BI) { 14969196d8acSJiri Slaby DEBUG_INTR("handling break...."); 14979196d8acSJiri Slaby flag = TTY_BREAK; 14989196d8acSJiri Slaby } else if (lsr & UART_LSR_PE) 14999196d8acSJiri Slaby flag = TTY_PARITY; 15009196d8acSJiri Slaby else if (lsr & UART_LSR_FE) 15019196d8acSJiri Slaby flag = TTY_FRAME; 15029196d8acSJiri Slaby } 15039196d8acSJiri Slaby if (uart_handle_sysrq_char(port, ch)) 15049196d8acSJiri Slaby goto ignore_char; 15059196d8acSJiri Slaby 15069196d8acSJiri Slaby uart_insert_char(port, lsr, UART_LSR_OE, ch, flag); 15079196d8acSJiri Slaby 15089196d8acSJiri Slaby ignore_char: 15099196d8acSJiri Slaby lsr = serial_in(up, UART_LSR); 1510c904375dSFrans Klaver } while ((lsr & (UART_LSR_DR | UART_LSR_BI)) && (--max_count > 0)); 15119196d8acSJiri Slaby spin_unlock(&port->lock); 15129196d8acSJiri Slaby tty_flip_buffer_push(&port->state->port); 15139196d8acSJiri Slaby spin_lock(&port->lock); 15149196d8acSJiri Slaby return lsr; 15159196d8acSJiri Slaby } 15169196d8acSJiri Slaby EXPORT_SYMBOL_GPL(serial8250_rx_chars); 15179196d8acSJiri Slaby 15189196d8acSJiri Slaby void serial8250_tx_chars(struct uart_8250_port *up) 15199196d8acSJiri Slaby { 15209196d8acSJiri Slaby struct uart_port *port = &up->port; 15219196d8acSJiri Slaby struct circ_buf *xmit = &port->state->xmit; 15229196d8acSJiri Slaby int count; 15239196d8acSJiri Slaby 15249196d8acSJiri Slaby if (port->x_char) { 15259196d8acSJiri Slaby serial_out(up, UART_TX, port->x_char); 15269196d8acSJiri Slaby port->icount.tx++; 15279196d8acSJiri Slaby port->x_char = 0; 15289196d8acSJiri Slaby return; 15299196d8acSJiri Slaby } 15309196d8acSJiri Slaby if (uart_tx_stopped(port)) { 15319196d8acSJiri Slaby serial8250_stop_tx(port); 15329196d8acSJiri Slaby return; 15339196d8acSJiri Slaby } 15349196d8acSJiri Slaby if (uart_circ_empty(xmit)) { 15359196d8acSJiri Slaby __stop_tx(up); 15369196d8acSJiri Slaby return; 15379196d8acSJiri Slaby } 15389196d8acSJiri Slaby 15399196d8acSJiri Slaby count = up->tx_loadsz; 15409196d8acSJiri Slaby do { 15419196d8acSJiri Slaby serial_out(up, UART_TX, xmit->buf[xmit->tail]); 15429196d8acSJiri Slaby xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); 15439196d8acSJiri Slaby port->icount.tx++; 15449196d8acSJiri Slaby if (uart_circ_empty(xmit)) 15459196d8acSJiri Slaby break; 15469196d8acSJiri Slaby if (up->capabilities & UART_CAP_HFIFO) { 15479196d8acSJiri Slaby if ((serial_port_in(port, UART_LSR) & BOTH_EMPTY) != 15489196d8acSJiri Slaby BOTH_EMPTY) 15499196d8acSJiri Slaby break; 15509196d8acSJiri Slaby } 15519196d8acSJiri Slaby } while (--count > 0); 15529196d8acSJiri Slaby 15539196d8acSJiri Slaby if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) 15549196d8acSJiri Slaby uart_write_wakeup(port); 15559196d8acSJiri Slaby 15569196d8acSJiri Slaby DEBUG_INTR("THRE..."); 15579196d8acSJiri Slaby 1558d74d5d1bSSebastian Andrzej Siewior /* 15596a529abaSSebastian Andrzej Siewior * With RPM enabled, we have to wait until the FIFO is empty before the 1560d74d5d1bSSebastian Andrzej Siewior * HW can go idle. So we get here once again with empty FIFO and disable 1561d74d5d1bSSebastian Andrzej Siewior * the interrupt and RPM in __stop_tx() 1562d74d5d1bSSebastian Andrzej Siewior */ 1563d74d5d1bSSebastian Andrzej Siewior if (uart_circ_empty(xmit) && !(up->capabilities & UART_CAP_RPM)) 15649196d8acSJiri Slaby __stop_tx(up); 15659196d8acSJiri Slaby } 15669196d8acSJiri Slaby EXPORT_SYMBOL_GPL(serial8250_tx_chars); 15679196d8acSJiri Slaby 15685435d20fSPeter Hurley /* Caller holds uart port lock */ 15699196d8acSJiri Slaby unsigned int serial8250_modem_status(struct uart_8250_port *up) 15709196d8acSJiri Slaby { 15719196d8acSJiri Slaby struct uart_port *port = &up->port; 15729196d8acSJiri Slaby unsigned int status = serial_in(up, UART_MSR); 15739196d8acSJiri Slaby 15749196d8acSJiri Slaby status |= up->msr_saved_flags; 15759196d8acSJiri Slaby up->msr_saved_flags = 0; 15769196d8acSJiri Slaby if (status & UART_MSR_ANY_DELTA && up->ier & UART_IER_MSI && 15779196d8acSJiri Slaby port->state != NULL) { 15789196d8acSJiri Slaby if (status & UART_MSR_TERI) 15799196d8acSJiri Slaby port->icount.rng++; 15809196d8acSJiri Slaby if (status & UART_MSR_DDSR) 15819196d8acSJiri Slaby port->icount.dsr++; 15829196d8acSJiri Slaby if (status & UART_MSR_DDCD) 15839196d8acSJiri Slaby uart_handle_dcd_change(port, status & UART_MSR_DCD); 15849196d8acSJiri Slaby if (status & UART_MSR_DCTS) 15859196d8acSJiri Slaby uart_handle_cts_change(port, status & UART_MSR_CTS); 15869196d8acSJiri Slaby 15879196d8acSJiri Slaby wake_up_interruptible(&port->state->port.delta_msr_wait); 15889196d8acSJiri Slaby } 15899196d8acSJiri Slaby 15909196d8acSJiri Slaby return status; 15919196d8acSJiri Slaby } 15929196d8acSJiri Slaby EXPORT_SYMBOL_GPL(serial8250_modem_status); 15939196d8acSJiri Slaby 15949196d8acSJiri Slaby /* 15959196d8acSJiri Slaby * This handles the interrupt from one port. 15969196d8acSJiri Slaby */ 15979196d8acSJiri Slaby int serial8250_handle_irq(struct uart_port *port, unsigned int iir) 15989196d8acSJiri Slaby { 15999196d8acSJiri Slaby unsigned char status; 16009196d8acSJiri Slaby unsigned long flags; 1601b1261c86SAndy Shevchenko struct uart_8250_port *up = up_to_u8250p(port); 16029196d8acSJiri Slaby int dma_err = 0; 16039196d8acSJiri Slaby 16049196d8acSJiri Slaby if (iir & UART_IIR_NO_INT) 16059196d8acSJiri Slaby return 0; 16069196d8acSJiri Slaby 16079196d8acSJiri Slaby spin_lock_irqsave(&port->lock, flags); 16089196d8acSJiri Slaby 16099196d8acSJiri Slaby status = serial_port_in(port, UART_LSR); 16109196d8acSJiri Slaby 16119196d8acSJiri Slaby DEBUG_INTR("status = %x...", status); 16129196d8acSJiri Slaby 16139196d8acSJiri Slaby if (status & (UART_LSR_DR | UART_LSR_BI)) { 16149196d8acSJiri Slaby if (up->dma) 1615f1a297bbSSebastian Andrzej Siewior dma_err = up->dma->rx_dma(up, iir); 16169196d8acSJiri Slaby 16179196d8acSJiri Slaby if (!up->dma || dma_err) 16189196d8acSJiri Slaby status = serial8250_rx_chars(up, status); 16199196d8acSJiri Slaby } 16209196d8acSJiri Slaby serial8250_modem_status(up); 1621b2202821SSebastian Andrzej Siewior if ((!up->dma || (up->dma && up->dma->tx_err)) && 1622b2202821SSebastian Andrzej Siewior (status & UART_LSR_THRE)) 16239196d8acSJiri Slaby serial8250_tx_chars(up); 16249196d8acSJiri Slaby 16259196d8acSJiri Slaby spin_unlock_irqrestore(&port->lock, flags); 16269196d8acSJiri Slaby return 1; 16279196d8acSJiri Slaby } 16289196d8acSJiri Slaby EXPORT_SYMBOL_GPL(serial8250_handle_irq); 16299196d8acSJiri Slaby 16309196d8acSJiri Slaby static int serial8250_default_handle_irq(struct uart_port *port) 16319196d8acSJiri Slaby { 1632d74d5d1bSSebastian Andrzej Siewior struct uart_8250_port *up = up_to_u8250p(port); 1633d74d5d1bSSebastian Andrzej Siewior unsigned int iir; 1634d74d5d1bSSebastian Andrzej Siewior int ret; 16359196d8acSJiri Slaby 1636d74d5d1bSSebastian Andrzej Siewior serial8250_rpm_get(up); 1637d74d5d1bSSebastian Andrzej Siewior 1638d74d5d1bSSebastian Andrzej Siewior iir = serial_port_in(port, UART_IIR); 1639d74d5d1bSSebastian Andrzej Siewior ret = serial8250_handle_irq(port, iir); 1640d74d5d1bSSebastian Andrzej Siewior 1641d74d5d1bSSebastian Andrzej Siewior serial8250_rpm_put(up); 1642d74d5d1bSSebastian Andrzej Siewior return ret; 16439196d8acSJiri Slaby } 16449196d8acSJiri Slaby 16459196d8acSJiri Slaby /* 16469196d8acSJiri Slaby * These Exar UARTs have an extra interrupt indicator that could 16479196d8acSJiri Slaby * fire for a few unimplemented interrupts. One of which is a 16489196d8acSJiri Slaby * wakeup event when coming out of sleep. Put this here just 16499196d8acSJiri Slaby * to be on the safe side that these interrupts don't go unhandled. 16509196d8acSJiri Slaby */ 16519196d8acSJiri Slaby static int exar_handle_irq(struct uart_port *port) 16529196d8acSJiri Slaby { 16539196d8acSJiri Slaby unsigned char int0, int1, int2, int3; 16549196d8acSJiri Slaby unsigned int iir = serial_port_in(port, UART_IIR); 16559196d8acSJiri Slaby int ret; 16569196d8acSJiri Slaby 16579196d8acSJiri Slaby ret = serial8250_handle_irq(port, iir); 16589196d8acSJiri Slaby 16599196d8acSJiri Slaby if ((port->type == PORT_XR17V35X) || 16609196d8acSJiri Slaby (port->type == PORT_XR17D15X)) { 16619196d8acSJiri Slaby int0 = serial_port_in(port, 0x80); 16629196d8acSJiri Slaby int1 = serial_port_in(port, 0x81); 16639196d8acSJiri Slaby int2 = serial_port_in(port, 0x82); 16649196d8acSJiri Slaby int3 = serial_port_in(port, 0x83); 16659196d8acSJiri Slaby } 16669196d8acSJiri Slaby 16679196d8acSJiri Slaby return ret; 16689196d8acSJiri Slaby } 16699196d8acSJiri Slaby 16709196d8acSJiri Slaby /* 16719196d8acSJiri Slaby * This is the serial driver's interrupt routine. 16729196d8acSJiri Slaby * 16739196d8acSJiri Slaby * Arjan thinks the old way was overly complex, so it got simplified. 16749196d8acSJiri Slaby * Alan disagrees, saying that need the complexity to handle the weird 16759196d8acSJiri Slaby * nature of ISA shared interrupts. (This is a special exception.) 16769196d8acSJiri Slaby * 16779196d8acSJiri Slaby * In order to handle ISA shared interrupts properly, we need to check 16789196d8acSJiri Slaby * that all ports have been serviced, and therefore the ISA interrupt 16799196d8acSJiri Slaby * line has been de-asserted. 16809196d8acSJiri Slaby * 16819196d8acSJiri Slaby * This means we need to loop through all ports. checking that they 16829196d8acSJiri Slaby * don't have an interrupt pending. 16839196d8acSJiri Slaby */ 16849196d8acSJiri Slaby static irqreturn_t serial8250_interrupt(int irq, void *dev_id) 16859196d8acSJiri Slaby { 16869196d8acSJiri Slaby struct irq_info *i = dev_id; 16879196d8acSJiri Slaby struct list_head *l, *end = NULL; 16889196d8acSJiri Slaby int pass_counter = 0, handled = 0; 16899196d8acSJiri Slaby 16909196d8acSJiri Slaby DEBUG_INTR("serial8250_interrupt(%d)...", irq); 16919196d8acSJiri Slaby 16929196d8acSJiri Slaby spin_lock(&i->lock); 16939196d8acSJiri Slaby 16949196d8acSJiri Slaby l = i->head; 16959196d8acSJiri Slaby do { 16969196d8acSJiri Slaby struct uart_8250_port *up; 16979196d8acSJiri Slaby struct uart_port *port; 16989196d8acSJiri Slaby 16999196d8acSJiri Slaby up = list_entry(l, struct uart_8250_port, list); 17009196d8acSJiri Slaby port = &up->port; 17019196d8acSJiri Slaby 17029196d8acSJiri Slaby if (port->handle_irq(port)) { 17039196d8acSJiri Slaby handled = 1; 17049196d8acSJiri Slaby end = NULL; 17059196d8acSJiri Slaby } else if (end == NULL) 17069196d8acSJiri Slaby end = l; 17079196d8acSJiri Slaby 17089196d8acSJiri Slaby l = l->next; 17099196d8acSJiri Slaby 17109196d8acSJiri Slaby if (l == i->head && pass_counter++ > PASS_LIMIT) { 17119196d8acSJiri Slaby /* If we hit this, we're dead. */ 17129196d8acSJiri Slaby printk_ratelimited(KERN_ERR 17139196d8acSJiri Slaby "serial8250: too much work for irq%d\n", irq); 17149196d8acSJiri Slaby break; 17159196d8acSJiri Slaby } 17169196d8acSJiri Slaby } while (l != end); 17179196d8acSJiri Slaby 17189196d8acSJiri Slaby spin_unlock(&i->lock); 17199196d8acSJiri Slaby 17209196d8acSJiri Slaby DEBUG_INTR("end.\n"); 17219196d8acSJiri Slaby 17229196d8acSJiri Slaby return IRQ_RETVAL(handled); 17239196d8acSJiri Slaby } 17249196d8acSJiri Slaby 17259196d8acSJiri Slaby /* 17269196d8acSJiri Slaby * To support ISA shared interrupts, we need to have one interrupt 17279196d8acSJiri Slaby * handler that ensures that the IRQ line has been deasserted 17289196d8acSJiri Slaby * before returning. Failing to do this will result in the IRQ 17299196d8acSJiri Slaby * line being stuck active, and, since ISA irqs are edge triggered, 17309196d8acSJiri Slaby * no more IRQs will be seen. 17319196d8acSJiri Slaby */ 17329196d8acSJiri Slaby static void serial_do_unlink(struct irq_info *i, struct uart_8250_port *up) 17339196d8acSJiri Slaby { 17349196d8acSJiri Slaby spin_lock_irq(&i->lock); 17359196d8acSJiri Slaby 17369196d8acSJiri Slaby if (!list_empty(i->head)) { 17379196d8acSJiri Slaby if (i->head == &up->list) 17389196d8acSJiri Slaby i->head = i->head->next; 17399196d8acSJiri Slaby list_del(&up->list); 17409196d8acSJiri Slaby } else { 17419196d8acSJiri Slaby BUG_ON(i->head != &up->list); 17429196d8acSJiri Slaby i->head = NULL; 17439196d8acSJiri Slaby } 17449196d8acSJiri Slaby spin_unlock_irq(&i->lock); 17459196d8acSJiri Slaby /* List empty so throw away the hash node */ 17469196d8acSJiri Slaby if (i->head == NULL) { 17479196d8acSJiri Slaby hlist_del(&i->node); 17489196d8acSJiri Slaby kfree(i); 17499196d8acSJiri Slaby } 17509196d8acSJiri Slaby } 17519196d8acSJiri Slaby 17529196d8acSJiri Slaby static int serial_link_irq_chain(struct uart_8250_port *up) 17539196d8acSJiri Slaby { 17549196d8acSJiri Slaby struct hlist_head *h; 17559196d8acSJiri Slaby struct hlist_node *n; 17569196d8acSJiri Slaby struct irq_info *i; 17579196d8acSJiri Slaby int ret, irq_flags = up->port.flags & UPF_SHARE_IRQ ? IRQF_SHARED : 0; 17589196d8acSJiri Slaby 17599196d8acSJiri Slaby mutex_lock(&hash_mutex); 17609196d8acSJiri Slaby 17619196d8acSJiri Slaby h = &irq_lists[up->port.irq % NR_IRQ_HASH]; 17629196d8acSJiri Slaby 17639196d8acSJiri Slaby hlist_for_each(n, h) { 17649196d8acSJiri Slaby i = hlist_entry(n, struct irq_info, node); 17659196d8acSJiri Slaby if (i->irq == up->port.irq) 17669196d8acSJiri Slaby break; 17679196d8acSJiri Slaby } 17689196d8acSJiri Slaby 17699196d8acSJiri Slaby if (n == NULL) { 17709196d8acSJiri Slaby i = kzalloc(sizeof(struct irq_info), GFP_KERNEL); 17719196d8acSJiri Slaby if (i == NULL) { 17729196d8acSJiri Slaby mutex_unlock(&hash_mutex); 17739196d8acSJiri Slaby return -ENOMEM; 17749196d8acSJiri Slaby } 17759196d8acSJiri Slaby spin_lock_init(&i->lock); 17769196d8acSJiri Slaby i->irq = up->port.irq; 17779196d8acSJiri Slaby hlist_add_head(&i->node, h); 17789196d8acSJiri Slaby } 17799196d8acSJiri Slaby mutex_unlock(&hash_mutex); 17809196d8acSJiri Slaby 17819196d8acSJiri Slaby spin_lock_irq(&i->lock); 17829196d8acSJiri Slaby 17839196d8acSJiri Slaby if (i->head) { 17849196d8acSJiri Slaby list_add(&up->list, i->head); 17859196d8acSJiri Slaby spin_unlock_irq(&i->lock); 17869196d8acSJiri Slaby 17879196d8acSJiri Slaby ret = 0; 17889196d8acSJiri Slaby } else { 17899196d8acSJiri Slaby INIT_LIST_HEAD(&up->list); 17909196d8acSJiri Slaby i->head = &up->list; 17919196d8acSJiri Slaby spin_unlock_irq(&i->lock); 17929196d8acSJiri Slaby irq_flags |= up->port.irqflags; 17939196d8acSJiri Slaby ret = request_irq(up->port.irq, serial8250_interrupt, 17949196d8acSJiri Slaby irq_flags, "serial", i); 17959196d8acSJiri Slaby if (ret < 0) 17969196d8acSJiri Slaby serial_do_unlink(i, up); 17979196d8acSJiri Slaby } 17989196d8acSJiri Slaby 17999196d8acSJiri Slaby return ret; 18009196d8acSJiri Slaby } 18019196d8acSJiri Slaby 18029196d8acSJiri Slaby static void serial_unlink_irq_chain(struct uart_8250_port *up) 18039196d8acSJiri Slaby { 1804bd2fe272SPaul Gortmaker /* 1805bd2fe272SPaul Gortmaker * yes, some broken gcc emit "warning: 'i' may be used uninitialized" 1806bd2fe272SPaul Gortmaker * but no, we are not going to take a patch that assigns NULL below. 1807bd2fe272SPaul Gortmaker */ 18089196d8acSJiri Slaby struct irq_info *i; 18099196d8acSJiri Slaby struct hlist_node *n; 18109196d8acSJiri Slaby struct hlist_head *h; 18119196d8acSJiri Slaby 18129196d8acSJiri Slaby mutex_lock(&hash_mutex); 18139196d8acSJiri Slaby 18149196d8acSJiri Slaby h = &irq_lists[up->port.irq % NR_IRQ_HASH]; 18159196d8acSJiri Slaby 18169196d8acSJiri Slaby hlist_for_each(n, h) { 18179196d8acSJiri Slaby i = hlist_entry(n, struct irq_info, node); 18189196d8acSJiri Slaby if (i->irq == up->port.irq) 18199196d8acSJiri Slaby break; 18209196d8acSJiri Slaby } 18219196d8acSJiri Slaby 18229196d8acSJiri Slaby BUG_ON(n == NULL); 18239196d8acSJiri Slaby BUG_ON(i->head == NULL); 18249196d8acSJiri Slaby 18259196d8acSJiri Slaby if (list_empty(i->head)) 18269196d8acSJiri Slaby free_irq(up->port.irq, i); 18279196d8acSJiri Slaby 18289196d8acSJiri Slaby serial_do_unlink(i, up); 18299196d8acSJiri Slaby mutex_unlock(&hash_mutex); 18309196d8acSJiri Slaby } 18319196d8acSJiri Slaby 18329196d8acSJiri Slaby /* 18339196d8acSJiri Slaby * This function is used to handle ports that do not have an 18349196d8acSJiri Slaby * interrupt. This doesn't work very well for 16450's, but gives 18359196d8acSJiri Slaby * barely passable results for a 16550A. (Although at the expense 18369196d8acSJiri Slaby * of much CPU overhead). 18379196d8acSJiri Slaby */ 18389196d8acSJiri Slaby static void serial8250_timeout(unsigned long data) 18399196d8acSJiri Slaby { 18409196d8acSJiri Slaby struct uart_8250_port *up = (struct uart_8250_port *)data; 18419196d8acSJiri Slaby 18429196d8acSJiri Slaby up->port.handle_irq(&up->port); 18439196d8acSJiri Slaby mod_timer(&up->timer, jiffies + uart_poll_timeout(&up->port)); 18449196d8acSJiri Slaby } 18459196d8acSJiri Slaby 18469196d8acSJiri Slaby static void serial8250_backup_timeout(unsigned long data) 18479196d8acSJiri Slaby { 18489196d8acSJiri Slaby struct uart_8250_port *up = (struct uart_8250_port *)data; 18499196d8acSJiri Slaby unsigned int iir, ier = 0, lsr; 18509196d8acSJiri Slaby unsigned long flags; 18519196d8acSJiri Slaby 18529196d8acSJiri Slaby spin_lock_irqsave(&up->port.lock, flags); 18539196d8acSJiri Slaby 18549196d8acSJiri Slaby /* 18559196d8acSJiri Slaby * Must disable interrupts or else we risk racing with the interrupt 18569196d8acSJiri Slaby * based handler. 18579196d8acSJiri Slaby */ 18589196d8acSJiri Slaby if (up->port.irq) { 18599196d8acSJiri Slaby ier = serial_in(up, UART_IER); 18609196d8acSJiri Slaby serial_out(up, UART_IER, 0); 18619196d8acSJiri Slaby } 18629196d8acSJiri Slaby 18639196d8acSJiri Slaby iir = serial_in(up, UART_IIR); 18649196d8acSJiri Slaby 18659196d8acSJiri Slaby /* 18669196d8acSJiri Slaby * This should be a safe test for anyone who doesn't trust the 18679196d8acSJiri Slaby * IIR bits on their UART, but it's specifically designed for 18689196d8acSJiri Slaby * the "Diva" UART used on the management processor on many HP 18699196d8acSJiri Slaby * ia64 and parisc boxes. 18709196d8acSJiri Slaby */ 18719196d8acSJiri Slaby lsr = serial_in(up, UART_LSR); 18729196d8acSJiri Slaby up->lsr_saved_flags |= lsr & LSR_SAVE_FLAGS; 18739196d8acSJiri Slaby if ((iir & UART_IIR_NO_INT) && (up->ier & UART_IER_THRI) && 18749196d8acSJiri Slaby (!uart_circ_empty(&up->port.state->xmit) || up->port.x_char) && 18759196d8acSJiri Slaby (lsr & UART_LSR_THRE)) { 18769196d8acSJiri Slaby iir &= ~(UART_IIR_ID | UART_IIR_NO_INT); 18779196d8acSJiri Slaby iir |= UART_IIR_THRI; 18789196d8acSJiri Slaby } 18799196d8acSJiri Slaby 18809196d8acSJiri Slaby if (!(iir & UART_IIR_NO_INT)) 18819196d8acSJiri Slaby serial8250_tx_chars(up); 18829196d8acSJiri Slaby 18839196d8acSJiri Slaby if (up->port.irq) 18849196d8acSJiri Slaby serial_out(up, UART_IER, ier); 18859196d8acSJiri Slaby 18869196d8acSJiri Slaby spin_unlock_irqrestore(&up->port.lock, flags); 18879196d8acSJiri Slaby 18889196d8acSJiri Slaby /* Standard timer interval plus 0.2s to keep the port running */ 18899196d8acSJiri Slaby mod_timer(&up->timer, 18909196d8acSJiri Slaby jiffies + uart_poll_timeout(&up->port) + HZ / 5); 18919196d8acSJiri Slaby } 18929196d8acSJiri Slaby 18939196d8acSJiri Slaby static unsigned int serial8250_tx_empty(struct uart_port *port) 18949196d8acSJiri Slaby { 1895b1261c86SAndy Shevchenko struct uart_8250_port *up = up_to_u8250p(port); 18969196d8acSJiri Slaby unsigned long flags; 18979196d8acSJiri Slaby unsigned int lsr; 18989196d8acSJiri Slaby 1899d74d5d1bSSebastian Andrzej Siewior serial8250_rpm_get(up); 1900d74d5d1bSSebastian Andrzej Siewior 19019196d8acSJiri Slaby spin_lock_irqsave(&port->lock, flags); 19029196d8acSJiri Slaby lsr = serial_port_in(port, UART_LSR); 19039196d8acSJiri Slaby up->lsr_saved_flags |= lsr & LSR_SAVE_FLAGS; 19049196d8acSJiri Slaby spin_unlock_irqrestore(&port->lock, flags); 19059196d8acSJiri Slaby 1906d74d5d1bSSebastian Andrzej Siewior serial8250_rpm_put(up); 1907d74d5d1bSSebastian Andrzej Siewior 19089196d8acSJiri Slaby return (lsr & BOTH_EMPTY) == BOTH_EMPTY ? TIOCSER_TEMT : 0; 19099196d8acSJiri Slaby } 19109196d8acSJiri Slaby 19119196d8acSJiri Slaby static unsigned int serial8250_get_mctrl(struct uart_port *port) 19129196d8acSJiri Slaby { 1913b1261c86SAndy Shevchenko struct uart_8250_port *up = up_to_u8250p(port); 19149196d8acSJiri Slaby unsigned int status; 19159196d8acSJiri Slaby unsigned int ret; 19169196d8acSJiri Slaby 1917d74d5d1bSSebastian Andrzej Siewior serial8250_rpm_get(up); 19189196d8acSJiri Slaby status = serial8250_modem_status(up); 1919d74d5d1bSSebastian Andrzej Siewior serial8250_rpm_put(up); 19209196d8acSJiri Slaby 19219196d8acSJiri Slaby ret = 0; 19229196d8acSJiri Slaby if (status & UART_MSR_DCD) 19239196d8acSJiri Slaby ret |= TIOCM_CAR; 19249196d8acSJiri Slaby if (status & UART_MSR_RI) 19259196d8acSJiri Slaby ret |= TIOCM_RNG; 19269196d8acSJiri Slaby if (status & UART_MSR_DSR) 19279196d8acSJiri Slaby ret |= TIOCM_DSR; 19289196d8acSJiri Slaby if (status & UART_MSR_CTS) 19299196d8acSJiri Slaby ret |= TIOCM_CTS; 19309196d8acSJiri Slaby return ret; 19319196d8acSJiri Slaby } 19329196d8acSJiri Slaby 19334bf4ea9dSPeter Hurley void serial8250_do_set_mctrl(struct uart_port *port, unsigned int mctrl) 19349196d8acSJiri Slaby { 1935b1261c86SAndy Shevchenko struct uart_8250_port *up = up_to_u8250p(port); 19369196d8acSJiri Slaby unsigned char mcr = 0; 19379196d8acSJiri Slaby 19389196d8acSJiri Slaby if (mctrl & TIOCM_RTS) 19399196d8acSJiri Slaby mcr |= UART_MCR_RTS; 19409196d8acSJiri Slaby if (mctrl & TIOCM_DTR) 19419196d8acSJiri Slaby mcr |= UART_MCR_DTR; 19429196d8acSJiri Slaby if (mctrl & TIOCM_OUT1) 19439196d8acSJiri Slaby mcr |= UART_MCR_OUT1; 19449196d8acSJiri Slaby if (mctrl & TIOCM_OUT2) 19459196d8acSJiri Slaby mcr |= UART_MCR_OUT2; 19469196d8acSJiri Slaby if (mctrl & TIOCM_LOOP) 19479196d8acSJiri Slaby mcr |= UART_MCR_LOOP; 19489196d8acSJiri Slaby 19499196d8acSJiri Slaby mcr = (mcr & up->mcr_mask) | up->mcr_force | up->mcr; 19509196d8acSJiri Slaby 19519196d8acSJiri Slaby serial_port_out(port, UART_MCR, mcr); 19529196d8acSJiri Slaby } 19534bf4ea9dSPeter Hurley EXPORT_SYMBOL_GPL(serial8250_do_set_mctrl); 19544bf4ea9dSPeter Hurley 19554bf4ea9dSPeter Hurley static void serial8250_set_mctrl(struct uart_port *port, unsigned int mctrl) 19564bf4ea9dSPeter Hurley { 19574bf4ea9dSPeter Hurley if (port->set_mctrl) 19584bf4ea9dSPeter Hurley return port->set_mctrl(port, mctrl); 19594bf4ea9dSPeter Hurley return serial8250_do_set_mctrl(port, mctrl); 19604bf4ea9dSPeter Hurley } 19619196d8acSJiri Slaby 19629196d8acSJiri Slaby static void serial8250_break_ctl(struct uart_port *port, int break_state) 19639196d8acSJiri Slaby { 1964b1261c86SAndy Shevchenko struct uart_8250_port *up = up_to_u8250p(port); 19659196d8acSJiri Slaby unsigned long flags; 19669196d8acSJiri Slaby 1967d74d5d1bSSebastian Andrzej Siewior serial8250_rpm_get(up); 19689196d8acSJiri Slaby spin_lock_irqsave(&port->lock, flags); 19699196d8acSJiri Slaby if (break_state == -1) 19709196d8acSJiri Slaby up->lcr |= UART_LCR_SBC; 19719196d8acSJiri Slaby else 19729196d8acSJiri Slaby up->lcr &= ~UART_LCR_SBC; 19739196d8acSJiri Slaby serial_port_out(port, UART_LCR, up->lcr); 19749196d8acSJiri Slaby spin_unlock_irqrestore(&port->lock, flags); 1975d74d5d1bSSebastian Andrzej Siewior serial8250_rpm_put(up); 19769196d8acSJiri Slaby } 19779196d8acSJiri Slaby 19789196d8acSJiri Slaby /* 19799196d8acSJiri Slaby * Wait for transmitter & holding register to empty 19809196d8acSJiri Slaby */ 19819196d8acSJiri Slaby static void wait_for_xmitr(struct uart_8250_port *up, int bits) 19829196d8acSJiri Slaby { 19839196d8acSJiri Slaby unsigned int status, tmout = 10000; 19849196d8acSJiri Slaby 19859196d8acSJiri Slaby /* Wait up to 10ms for the character(s) to be sent. */ 19869196d8acSJiri Slaby for (;;) { 19879196d8acSJiri Slaby status = serial_in(up, UART_LSR); 19889196d8acSJiri Slaby 19899196d8acSJiri Slaby up->lsr_saved_flags |= status & LSR_SAVE_FLAGS; 19909196d8acSJiri Slaby 19919196d8acSJiri Slaby if ((status & bits) == bits) 19929196d8acSJiri Slaby break; 19939196d8acSJiri Slaby if (--tmout == 0) 19949196d8acSJiri Slaby break; 19959196d8acSJiri Slaby udelay(1); 19969196d8acSJiri Slaby } 19979196d8acSJiri Slaby 19989196d8acSJiri Slaby /* Wait up to 1s for flow control if necessary */ 19999196d8acSJiri Slaby if (up->port.flags & UPF_CONS_FLOW) { 20009196d8acSJiri Slaby unsigned int tmout; 20019196d8acSJiri Slaby for (tmout = 1000000; tmout; tmout--) { 20029196d8acSJiri Slaby unsigned int msr = serial_in(up, UART_MSR); 20039196d8acSJiri Slaby up->msr_saved_flags |= msr & MSR_SAVE_FLAGS; 20049196d8acSJiri Slaby if (msr & UART_MSR_CTS) 20059196d8acSJiri Slaby break; 20069196d8acSJiri Slaby udelay(1); 20079196d8acSJiri Slaby touch_nmi_watchdog(); 20089196d8acSJiri Slaby } 20099196d8acSJiri Slaby } 20109196d8acSJiri Slaby } 20119196d8acSJiri Slaby 20129196d8acSJiri Slaby #ifdef CONFIG_CONSOLE_POLL 20139196d8acSJiri Slaby /* 20149196d8acSJiri Slaby * Console polling routines for writing and reading from the uart while 20159196d8acSJiri Slaby * in an interrupt or debug context. 20169196d8acSJiri Slaby */ 20179196d8acSJiri Slaby 20189196d8acSJiri Slaby static int serial8250_get_poll_char(struct uart_port *port) 20199196d8acSJiri Slaby { 2020d74d5d1bSSebastian Andrzej Siewior struct uart_8250_port *up = up_to_u8250p(port); 2021d74d5d1bSSebastian Andrzej Siewior unsigned char lsr; 2022d74d5d1bSSebastian Andrzej Siewior int status; 20239196d8acSJiri Slaby 2024d74d5d1bSSebastian Andrzej Siewior serial8250_rpm_get(up); 20259196d8acSJiri Slaby 2026d74d5d1bSSebastian Andrzej Siewior lsr = serial_port_in(port, UART_LSR); 2027d74d5d1bSSebastian Andrzej Siewior 2028d74d5d1bSSebastian Andrzej Siewior if (!(lsr & UART_LSR_DR)) { 2029d74d5d1bSSebastian Andrzej Siewior status = NO_POLL_CHAR; 2030d74d5d1bSSebastian Andrzej Siewior goto out; 2031d74d5d1bSSebastian Andrzej Siewior } 2032d74d5d1bSSebastian Andrzej Siewior 2033d74d5d1bSSebastian Andrzej Siewior status = serial_port_in(port, UART_RX); 2034d74d5d1bSSebastian Andrzej Siewior out: 2035d74d5d1bSSebastian Andrzej Siewior serial8250_rpm_put(up); 2036d74d5d1bSSebastian Andrzej Siewior return status; 20379196d8acSJiri Slaby } 20389196d8acSJiri Slaby 20399196d8acSJiri Slaby 20409196d8acSJiri Slaby static void serial8250_put_poll_char(struct uart_port *port, 20419196d8acSJiri Slaby unsigned char c) 20429196d8acSJiri Slaby { 20439196d8acSJiri Slaby unsigned int ier; 2044b1261c86SAndy Shevchenko struct uart_8250_port *up = up_to_u8250p(port); 20459196d8acSJiri Slaby 2046d74d5d1bSSebastian Andrzej Siewior serial8250_rpm_get(up); 20479196d8acSJiri Slaby /* 20489196d8acSJiri Slaby * First save the IER then disable the interrupts 20499196d8acSJiri Slaby */ 20509196d8acSJiri Slaby ier = serial_port_in(port, UART_IER); 20519196d8acSJiri Slaby if (up->capabilities & UART_CAP_UUE) 20529196d8acSJiri Slaby serial_port_out(port, UART_IER, UART_IER_UUE); 20539196d8acSJiri Slaby else 20549196d8acSJiri Slaby serial_port_out(port, UART_IER, 0); 20559196d8acSJiri Slaby 20569196d8acSJiri Slaby wait_for_xmitr(up, BOTH_EMPTY); 20579196d8acSJiri Slaby /* 20589196d8acSJiri Slaby * Send the character out. 20599196d8acSJiri Slaby */ 20609196d8acSJiri Slaby serial_port_out(port, UART_TX, c); 20619196d8acSJiri Slaby 20629196d8acSJiri Slaby /* 20639196d8acSJiri Slaby * Finally, wait for transmitter to become empty 20649196d8acSJiri Slaby * and restore the IER 20659196d8acSJiri Slaby */ 20669196d8acSJiri Slaby wait_for_xmitr(up, BOTH_EMPTY); 20679196d8acSJiri Slaby serial_port_out(port, UART_IER, ier); 2068d74d5d1bSSebastian Andrzej Siewior serial8250_rpm_put(up); 20699196d8acSJiri Slaby } 20709196d8acSJiri Slaby 20719196d8acSJiri Slaby #endif /* CONFIG_CONSOLE_POLL */ 20729196d8acSJiri Slaby 2073b99b121bSSebastian Andrzej Siewior int serial8250_do_startup(struct uart_port *port) 20749196d8acSJiri Slaby { 2075b1261c86SAndy Shevchenko struct uart_8250_port *up = up_to_u8250p(port); 20769196d8acSJiri Slaby unsigned long flags; 20779196d8acSJiri Slaby unsigned char lsr, iir; 20789196d8acSJiri Slaby int retval; 20799196d8acSJiri Slaby 20809196d8acSJiri Slaby if (port->type == PORT_8250_CIR) 20819196d8acSJiri Slaby return -ENODEV; 20829196d8acSJiri Slaby 20839196d8acSJiri Slaby if (!port->fifosize) 20849196d8acSJiri Slaby port->fifosize = uart_config[port->type].fifo_size; 20859196d8acSJiri Slaby if (!up->tx_loadsz) 20869196d8acSJiri Slaby up->tx_loadsz = uart_config[port->type].tx_loadsz; 20879196d8acSJiri Slaby if (!up->capabilities) 20889196d8acSJiri Slaby up->capabilities = uart_config[port->type].flags; 20899196d8acSJiri Slaby up->mcr = 0; 20909196d8acSJiri Slaby 20919196d8acSJiri Slaby if (port->iotype != up->cur_iotype) 20929196d8acSJiri Slaby set_io_from_upio(port); 20939196d8acSJiri Slaby 2094d74d5d1bSSebastian Andrzej Siewior serial8250_rpm_get(up); 20959196d8acSJiri Slaby if (port->type == PORT_16C950) { 20969196d8acSJiri Slaby /* Wake up and initialize UART */ 20979196d8acSJiri Slaby up->acr = 0; 20989196d8acSJiri Slaby serial_port_out(port, UART_LCR, UART_LCR_CONF_MODE_B); 20999196d8acSJiri Slaby serial_port_out(port, UART_EFR, UART_EFR_ECB); 21009196d8acSJiri Slaby serial_port_out(port, UART_IER, 0); 21019196d8acSJiri Slaby serial_port_out(port, UART_LCR, 0); 21029196d8acSJiri Slaby serial_icr_write(up, UART_CSR, 0); /* Reset the UART */ 21039196d8acSJiri Slaby serial_port_out(port, UART_LCR, UART_LCR_CONF_MODE_B); 21049196d8acSJiri Slaby serial_port_out(port, UART_EFR, UART_EFR_ECB); 21059196d8acSJiri Slaby serial_port_out(port, UART_LCR, 0); 21069196d8acSJiri Slaby } 21079196d8acSJiri Slaby 21089196d8acSJiri Slaby #ifdef CONFIG_SERIAL_8250_RSA 21099196d8acSJiri Slaby /* 21109196d8acSJiri Slaby * If this is an RSA port, see if we can kick it up to the 21119196d8acSJiri Slaby * higher speed clock. 21129196d8acSJiri Slaby */ 21139196d8acSJiri Slaby enable_rsa(up); 21149196d8acSJiri Slaby #endif 21159196d8acSJiri Slaby /* 21169196d8acSJiri Slaby * Clear the FIFO buffers and disable them. 21179196d8acSJiri Slaby * (they will be reenabled in set_termios()) 21189196d8acSJiri Slaby */ 21199196d8acSJiri Slaby serial8250_clear_fifos(up); 21209196d8acSJiri Slaby 21219196d8acSJiri Slaby /* 21229196d8acSJiri Slaby * Clear the interrupt registers. 21239196d8acSJiri Slaby */ 2124ca8bb4aeSSebastian Andrzej Siewior serial_port_in(port, UART_LSR); 21259196d8acSJiri Slaby serial_port_in(port, UART_RX); 21269196d8acSJiri Slaby serial_port_in(port, UART_IIR); 21279196d8acSJiri Slaby serial_port_in(port, UART_MSR); 21289196d8acSJiri Slaby 21299196d8acSJiri Slaby /* 21309196d8acSJiri Slaby * At this point, there's no way the LSR could still be 0xff; 21319196d8acSJiri Slaby * if it is, then bail out, because there's likely no UART 21329196d8acSJiri Slaby * here. 21339196d8acSJiri Slaby */ 21349196d8acSJiri Slaby if (!(port->flags & UPF_BUGGY_UART) && 21359196d8acSJiri Slaby (serial_port_in(port, UART_LSR) == 0xff)) { 21369196d8acSJiri Slaby printk_ratelimited(KERN_INFO "ttyS%d: LSR safety check engaged!\n", 21379196d8acSJiri Slaby serial_index(port)); 2138d74d5d1bSSebastian Andrzej Siewior retval = -ENODEV; 2139d74d5d1bSSebastian Andrzej Siewior goto out; 21409196d8acSJiri Slaby } 21419196d8acSJiri Slaby 21429196d8acSJiri Slaby /* 21439196d8acSJiri Slaby * For a XR16C850, we need to set the trigger levels 21449196d8acSJiri Slaby */ 21459196d8acSJiri Slaby if (port->type == PORT_16850) { 21469196d8acSJiri Slaby unsigned char fctr; 21479196d8acSJiri Slaby 21489196d8acSJiri Slaby serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); 21499196d8acSJiri Slaby 21509196d8acSJiri Slaby fctr = serial_in(up, UART_FCTR) & ~(UART_FCTR_RX|UART_FCTR_TX); 21519196d8acSJiri Slaby serial_port_out(port, UART_FCTR, 21529196d8acSJiri Slaby fctr | UART_FCTR_TRGD | UART_FCTR_RX); 21539196d8acSJiri Slaby serial_port_out(port, UART_TRG, UART_TRG_96); 21549196d8acSJiri Slaby serial_port_out(port, UART_FCTR, 21559196d8acSJiri Slaby fctr | UART_FCTR_TRGD | UART_FCTR_TX); 21569196d8acSJiri Slaby serial_port_out(port, UART_TRG, UART_TRG_96); 21579196d8acSJiri Slaby 21589196d8acSJiri Slaby serial_port_out(port, UART_LCR, 0); 21599196d8acSJiri Slaby } 21609196d8acSJiri Slaby 21619196d8acSJiri Slaby if (port->irq) { 21629196d8acSJiri Slaby unsigned char iir1; 21639196d8acSJiri Slaby /* 21649196d8acSJiri Slaby * Test for UARTs that do not reassert THRE when the 21659196d8acSJiri Slaby * transmitter is idle and the interrupt has already 21669196d8acSJiri Slaby * been cleared. Real 16550s should always reassert 21679196d8acSJiri Slaby * this interrupt whenever the transmitter is idle and 21689196d8acSJiri Slaby * the interrupt is enabled. Delays are necessary to 21699196d8acSJiri Slaby * allow register changes to become visible. 21709196d8acSJiri Slaby */ 21719196d8acSJiri Slaby spin_lock_irqsave(&port->lock, flags); 21729196d8acSJiri Slaby if (up->port.irqflags & IRQF_SHARED) 21739196d8acSJiri Slaby disable_irq_nosync(port->irq); 21749196d8acSJiri Slaby 21759196d8acSJiri Slaby wait_for_xmitr(up, UART_LSR_THRE); 21769196d8acSJiri Slaby serial_port_out_sync(port, UART_IER, UART_IER_THRI); 21779196d8acSJiri Slaby udelay(1); /* allow THRE to set */ 21789196d8acSJiri Slaby iir1 = serial_port_in(port, UART_IIR); 21799196d8acSJiri Slaby serial_port_out(port, UART_IER, 0); 21809196d8acSJiri Slaby serial_port_out_sync(port, UART_IER, UART_IER_THRI); 21819196d8acSJiri Slaby udelay(1); /* allow a working UART time to re-assert THRE */ 21829196d8acSJiri Slaby iir = serial_port_in(port, UART_IIR); 21839196d8acSJiri Slaby serial_port_out(port, UART_IER, 0); 21849196d8acSJiri Slaby 21859196d8acSJiri Slaby if (port->irqflags & IRQF_SHARED) 21869196d8acSJiri Slaby enable_irq(port->irq); 21879196d8acSJiri Slaby spin_unlock_irqrestore(&port->lock, flags); 21889196d8acSJiri Slaby 21899196d8acSJiri Slaby /* 21909196d8acSJiri Slaby * If the interrupt is not reasserted, or we otherwise 21919196d8acSJiri Slaby * don't trust the iir, setup a timer to kick the UART 21929196d8acSJiri Slaby * on a regular basis. 21939196d8acSJiri Slaby */ 21949196d8acSJiri Slaby if ((!(iir1 & UART_IIR_NO_INT) && (iir & UART_IIR_NO_INT)) || 21959196d8acSJiri Slaby up->port.flags & UPF_BUG_THRE) { 21969196d8acSJiri Slaby up->bugs |= UART_BUG_THRE; 21979196d8acSJiri Slaby pr_debug("ttyS%d - using backup timer\n", 21989196d8acSJiri Slaby serial_index(port)); 21999196d8acSJiri Slaby } 22009196d8acSJiri Slaby } 22019196d8acSJiri Slaby 22029196d8acSJiri Slaby /* 22039196d8acSJiri Slaby * The above check will only give an accurate result the first time 22049196d8acSJiri Slaby * the port is opened so this value needs to be preserved. 22059196d8acSJiri Slaby */ 22069196d8acSJiri Slaby if (up->bugs & UART_BUG_THRE) { 22079196d8acSJiri Slaby up->timer.function = serial8250_backup_timeout; 22089196d8acSJiri Slaby up->timer.data = (unsigned long)up; 22099196d8acSJiri Slaby mod_timer(&up->timer, jiffies + 22109196d8acSJiri Slaby uart_poll_timeout(port) + HZ / 5); 22119196d8acSJiri Slaby } 22129196d8acSJiri Slaby 22139196d8acSJiri Slaby /* 22149196d8acSJiri Slaby * If the "interrupt" for this port doesn't correspond with any 22159196d8acSJiri Slaby * hardware interrupt, we use a timer-based system. The original 22169196d8acSJiri Slaby * driver used to do this with IRQ0. 22179196d8acSJiri Slaby */ 22189196d8acSJiri Slaby if (!port->irq) { 22199196d8acSJiri Slaby up->timer.data = (unsigned long)up; 22209196d8acSJiri Slaby mod_timer(&up->timer, jiffies + uart_poll_timeout(port)); 22219196d8acSJiri Slaby } else { 22229196d8acSJiri Slaby retval = serial_link_irq_chain(up); 22239196d8acSJiri Slaby if (retval) 2224d74d5d1bSSebastian Andrzej Siewior goto out; 22259196d8acSJiri Slaby } 22269196d8acSJiri Slaby 22279196d8acSJiri Slaby /* 22289196d8acSJiri Slaby * Now, initialize the UART 22299196d8acSJiri Slaby */ 22309196d8acSJiri Slaby serial_port_out(port, UART_LCR, UART_LCR_WLEN8); 22319196d8acSJiri Slaby 22329196d8acSJiri Slaby spin_lock_irqsave(&port->lock, flags); 22339196d8acSJiri Slaby if (up->port.flags & UPF_FOURPORT) { 22349196d8acSJiri Slaby if (!up->port.irq) 22359196d8acSJiri Slaby up->port.mctrl |= TIOCM_OUT1; 22369196d8acSJiri Slaby } else 22379196d8acSJiri Slaby /* 22389196d8acSJiri Slaby * Most PC uarts need OUT2 raised to enable interrupts. 22399196d8acSJiri Slaby */ 22409196d8acSJiri Slaby if (port->irq) 22419196d8acSJiri Slaby up->port.mctrl |= TIOCM_OUT2; 22429196d8acSJiri Slaby 22439196d8acSJiri Slaby serial8250_set_mctrl(port, port->mctrl); 22449196d8acSJiri Slaby 22459196d8acSJiri Slaby /* Serial over Lan (SoL) hack: 22469196d8acSJiri Slaby Intel 8257x Gigabit ethernet chips have a 22479196d8acSJiri Slaby 16550 emulation, to be used for Serial Over Lan. 22489196d8acSJiri Slaby Those chips take a longer time than a normal 22499196d8acSJiri Slaby serial device to signalize that a transmission 22509196d8acSJiri Slaby data was queued. Due to that, the above test generally 22519196d8acSJiri Slaby fails. One solution would be to delay the reading of 22529196d8acSJiri Slaby iir. However, this is not reliable, since the timeout 22539196d8acSJiri Slaby is variable. So, let's just don't test if we receive 22549196d8acSJiri Slaby TX irq. This way, we'll never enable UART_BUG_TXEN. 22559196d8acSJiri Slaby */ 2256e13cb72bSPeter Hurley if (up->port.flags & UPF_NO_TXEN_TEST) 22579196d8acSJiri Slaby goto dont_test_tx_en; 22589196d8acSJiri Slaby 22599196d8acSJiri Slaby /* 22609196d8acSJiri Slaby * Do a quick test to see if we receive an 22619196d8acSJiri Slaby * interrupt when we enable the TX irq. 22629196d8acSJiri Slaby */ 22639196d8acSJiri Slaby serial_port_out(port, UART_IER, UART_IER_THRI); 22649196d8acSJiri Slaby lsr = serial_port_in(port, UART_LSR); 22659196d8acSJiri Slaby iir = serial_port_in(port, UART_IIR); 22669196d8acSJiri Slaby serial_port_out(port, UART_IER, 0); 22679196d8acSJiri Slaby 22689196d8acSJiri Slaby if (lsr & UART_LSR_TEMT && iir & UART_IIR_NO_INT) { 22699196d8acSJiri Slaby if (!(up->bugs & UART_BUG_TXEN)) { 22709196d8acSJiri Slaby up->bugs |= UART_BUG_TXEN; 22719196d8acSJiri Slaby pr_debug("ttyS%d - enabling bad tx status workarounds\n", 22729196d8acSJiri Slaby serial_index(port)); 22739196d8acSJiri Slaby } 22749196d8acSJiri Slaby } else { 22759196d8acSJiri Slaby up->bugs &= ~UART_BUG_TXEN; 22769196d8acSJiri Slaby } 22779196d8acSJiri Slaby 22789196d8acSJiri Slaby dont_test_tx_en: 22799196d8acSJiri Slaby spin_unlock_irqrestore(&port->lock, flags); 22809196d8acSJiri Slaby 22819196d8acSJiri Slaby /* 22829196d8acSJiri Slaby * Clear the interrupt registers again for luck, and clear the 22839196d8acSJiri Slaby * saved flags to avoid getting false values from polling 22849196d8acSJiri Slaby * routines or the previous session. 22859196d8acSJiri Slaby */ 2286ca8bb4aeSSebastian Andrzej Siewior serial_port_in(port, UART_LSR); 22879196d8acSJiri Slaby serial_port_in(port, UART_RX); 22889196d8acSJiri Slaby serial_port_in(port, UART_IIR); 22899196d8acSJiri Slaby serial_port_in(port, UART_MSR); 22909196d8acSJiri Slaby up->lsr_saved_flags = 0; 22919196d8acSJiri Slaby up->msr_saved_flags = 0; 22929196d8acSJiri Slaby 22939196d8acSJiri Slaby /* 22949196d8acSJiri Slaby * Request DMA channels for both RX and TX. 22959196d8acSJiri Slaby */ 22969196d8acSJiri Slaby if (up->dma) { 22979196d8acSJiri Slaby retval = serial8250_request_dma(up); 22989196d8acSJiri Slaby if (retval) { 22999196d8acSJiri Slaby pr_warn_ratelimited("ttyS%d - failed to request DMA\n", 23009196d8acSJiri Slaby serial_index(port)); 23019196d8acSJiri Slaby up->dma = NULL; 23029196d8acSJiri Slaby } 23039196d8acSJiri Slaby } 23049196d8acSJiri Slaby 23059196d8acSJiri Slaby /* 23069196d8acSJiri Slaby * Finally, enable interrupts. Note: Modem status interrupts 23079196d8acSJiri Slaby * are set via set_termios(), which will be occurring imminently 23089196d8acSJiri Slaby * anyway, so we don't enable them here. 23099196d8acSJiri Slaby */ 23109196d8acSJiri Slaby up->ier = UART_IER_RLSI | UART_IER_RDI; 23119196d8acSJiri Slaby serial_port_out(port, UART_IER, up->ier); 23129196d8acSJiri Slaby 23139196d8acSJiri Slaby if (port->flags & UPF_FOURPORT) { 23149196d8acSJiri Slaby unsigned int icp; 23159196d8acSJiri Slaby /* 23169196d8acSJiri Slaby * Enable interrupts on the AST Fourport board 23179196d8acSJiri Slaby */ 23189196d8acSJiri Slaby icp = (port->iobase & 0xfe0) | 0x01f; 23199196d8acSJiri Slaby outb_p(0x80, icp); 23209196d8acSJiri Slaby inb_p(icp); 23219196d8acSJiri Slaby } 2322d74d5d1bSSebastian Andrzej Siewior retval = 0; 2323d74d5d1bSSebastian Andrzej Siewior out: 2324d74d5d1bSSebastian Andrzej Siewior serial8250_rpm_put(up); 2325d74d5d1bSSebastian Andrzej Siewior return retval; 23269196d8acSJiri Slaby } 2327b99b121bSSebastian Andrzej Siewior EXPORT_SYMBOL_GPL(serial8250_do_startup); 23289196d8acSJiri Slaby 2329b99b121bSSebastian Andrzej Siewior static int serial8250_startup(struct uart_port *port) 2330b99b121bSSebastian Andrzej Siewior { 2331b99b121bSSebastian Andrzej Siewior if (port->startup) 2332b99b121bSSebastian Andrzej Siewior return port->startup(port); 2333b99b121bSSebastian Andrzej Siewior return serial8250_do_startup(port); 23349196d8acSJiri Slaby } 23359196d8acSJiri Slaby 2336b99b121bSSebastian Andrzej Siewior void serial8250_do_shutdown(struct uart_port *port) 23379196d8acSJiri Slaby { 2338b1261c86SAndy Shevchenko struct uart_8250_port *up = up_to_u8250p(port); 23399196d8acSJiri Slaby unsigned long flags; 23409196d8acSJiri Slaby 2341d74d5d1bSSebastian Andrzej Siewior serial8250_rpm_get(up); 23429196d8acSJiri Slaby /* 23439196d8acSJiri Slaby * Disable interrupts from this port 23449196d8acSJiri Slaby */ 23459196d8acSJiri Slaby up->ier = 0; 23469196d8acSJiri Slaby serial_port_out(port, UART_IER, 0); 23479196d8acSJiri Slaby 23489196d8acSJiri Slaby if (up->dma) 23499196d8acSJiri Slaby serial8250_release_dma(up); 23509196d8acSJiri Slaby 23519196d8acSJiri Slaby spin_lock_irqsave(&port->lock, flags); 23529196d8acSJiri Slaby if (port->flags & UPF_FOURPORT) { 23539196d8acSJiri Slaby /* reset interrupts on the AST Fourport board */ 23549196d8acSJiri Slaby inb((port->iobase & 0xfe0) | 0x1f); 23559196d8acSJiri Slaby port->mctrl |= TIOCM_OUT1; 23569196d8acSJiri Slaby } else 23579196d8acSJiri Slaby port->mctrl &= ~TIOCM_OUT2; 23589196d8acSJiri Slaby 23599196d8acSJiri Slaby serial8250_set_mctrl(port, port->mctrl); 23609196d8acSJiri Slaby spin_unlock_irqrestore(&port->lock, flags); 23619196d8acSJiri Slaby 23629196d8acSJiri Slaby /* 23639196d8acSJiri Slaby * Disable break condition and FIFOs 23649196d8acSJiri Slaby */ 23659196d8acSJiri Slaby serial_port_out(port, UART_LCR, 23669196d8acSJiri Slaby serial_port_in(port, UART_LCR) & ~UART_LCR_SBC); 23679196d8acSJiri Slaby serial8250_clear_fifos(up); 23689196d8acSJiri Slaby 23699196d8acSJiri Slaby #ifdef CONFIG_SERIAL_8250_RSA 23709196d8acSJiri Slaby /* 23719196d8acSJiri Slaby * Reset the RSA board back to 115kbps compat mode. 23729196d8acSJiri Slaby */ 23739196d8acSJiri Slaby disable_rsa(up); 23749196d8acSJiri Slaby #endif 23759196d8acSJiri Slaby 23769196d8acSJiri Slaby /* 23779196d8acSJiri Slaby * Read data port to reset things, and then unlink from 23789196d8acSJiri Slaby * the IRQ chain. 23799196d8acSJiri Slaby */ 23809196d8acSJiri Slaby serial_port_in(port, UART_RX); 2381d74d5d1bSSebastian Andrzej Siewior serial8250_rpm_put(up); 23829196d8acSJiri Slaby 23839196d8acSJiri Slaby del_timer_sync(&up->timer); 23849196d8acSJiri Slaby up->timer.function = serial8250_timeout; 23859196d8acSJiri Slaby if (port->irq) 23869196d8acSJiri Slaby serial_unlink_irq_chain(up); 23879196d8acSJiri Slaby } 2388b99b121bSSebastian Andrzej Siewior EXPORT_SYMBOL_GPL(serial8250_do_shutdown); 2389b99b121bSSebastian Andrzej Siewior 2390b99b121bSSebastian Andrzej Siewior static void serial8250_shutdown(struct uart_port *port) 2391b99b121bSSebastian Andrzej Siewior { 2392b99b121bSSebastian Andrzej Siewior if (port->shutdown) 2393b99b121bSSebastian Andrzej Siewior port->shutdown(port); 2394b99b121bSSebastian Andrzej Siewior else 2395b99b121bSSebastian Andrzej Siewior serial8250_do_shutdown(port); 2396b99b121bSSebastian Andrzej Siewior } 23979196d8acSJiri Slaby 239806a4c710SPeter Hurley /* 239906a4c710SPeter Hurley * XR17V35x UARTs have an extra fractional divisor register (DLD) 240006a4c710SPeter Hurley * Calculate divisor with extra 4-bit fractional portion 240106a4c710SPeter Hurley */ 240206a4c710SPeter Hurley static unsigned int xr17v35x_get_divisor(struct uart_8250_port *up, 240306a4c710SPeter Hurley unsigned int baud, 240406a4c710SPeter Hurley unsigned int *frac) 240506a4c710SPeter Hurley { 240606a4c710SPeter Hurley struct uart_port *port = &up->port; 240706a4c710SPeter Hurley unsigned int quot_16; 240806a4c710SPeter Hurley 240906a4c710SPeter Hurley quot_16 = DIV_ROUND_CLOSEST(port->uartclk, baud); 241006a4c710SPeter Hurley *frac = quot_16 & 0x0f; 241106a4c710SPeter Hurley 241206a4c710SPeter Hurley return quot_16 >> 4; 241306a4c710SPeter Hurley } 241406a4c710SPeter Hurley 241506a4c710SPeter Hurley static unsigned int serial8250_get_divisor(struct uart_8250_port *up, 241606a4c710SPeter Hurley unsigned int baud, 241706a4c710SPeter Hurley unsigned int *frac) 24189196d8acSJiri Slaby { 2419d1f2f219SPeter Hurley struct uart_port *port = &up->port; 24209196d8acSJiri Slaby unsigned int quot; 24219196d8acSJiri Slaby 24229196d8acSJiri Slaby /* 24239196d8acSJiri Slaby * Handle magic divisors for baud rates above baud_base on 24249196d8acSJiri Slaby * SMSC SuperIO chips. 242506a4c710SPeter Hurley * 24269196d8acSJiri Slaby */ 24279196d8acSJiri Slaby if ((port->flags & UPF_MAGIC_MULTIPLIER) && 24289196d8acSJiri Slaby baud == (port->uartclk/4)) 24299196d8acSJiri Slaby quot = 0x8001; 24309196d8acSJiri Slaby else if ((port->flags & UPF_MAGIC_MULTIPLIER) && 24319196d8acSJiri Slaby baud == (port->uartclk/8)) 24329196d8acSJiri Slaby quot = 0x8002; 243306a4c710SPeter Hurley else if (up->port.type == PORT_XR17V35X) 243406a4c710SPeter Hurley quot = xr17v35x_get_divisor(up, baud, frac); 24359196d8acSJiri Slaby else 24369196d8acSJiri Slaby quot = uart_get_divisor(port, baud); 24379196d8acSJiri Slaby 2438d1f2f219SPeter Hurley /* 2439d1f2f219SPeter Hurley * Oxford Semi 952 rev B workaround 2440d1f2f219SPeter Hurley */ 2441d1f2f219SPeter Hurley if (up->bugs & UART_BUG_QUOT && (quot & 0xff) == 0) 2442d1f2f219SPeter Hurley quot++; 2443d1f2f219SPeter Hurley 24449196d8acSJiri Slaby return quot; 24459196d8acSJiri Slaby } 24469196d8acSJiri Slaby 24470ec3f585SPeter Hurley static unsigned char serial8250_compute_lcr(struct uart_8250_port *up, 24480ec3f585SPeter Hurley tcflag_t c_cflag) 24499196d8acSJiri Slaby { 2450aef9a7bdSYoshihiro YUNOMAE unsigned char cval; 24519196d8acSJiri Slaby 24520ec3f585SPeter Hurley switch (c_cflag & CSIZE) { 24539196d8acSJiri Slaby case CS5: 24549196d8acSJiri Slaby cval = UART_LCR_WLEN5; 24559196d8acSJiri Slaby break; 24569196d8acSJiri Slaby case CS6: 24579196d8acSJiri Slaby cval = UART_LCR_WLEN6; 24589196d8acSJiri Slaby break; 24599196d8acSJiri Slaby case CS7: 24609196d8acSJiri Slaby cval = UART_LCR_WLEN7; 24619196d8acSJiri Slaby break; 24629196d8acSJiri Slaby default: 24639196d8acSJiri Slaby case CS8: 24649196d8acSJiri Slaby cval = UART_LCR_WLEN8; 24659196d8acSJiri Slaby break; 24669196d8acSJiri Slaby } 24679196d8acSJiri Slaby 24680ec3f585SPeter Hurley if (c_cflag & CSTOPB) 24699196d8acSJiri Slaby cval |= UART_LCR_STOP; 24700ec3f585SPeter Hurley if (c_cflag & PARENB) { 24719196d8acSJiri Slaby cval |= UART_LCR_PARITY; 24729196d8acSJiri Slaby if (up->bugs & UART_BUG_PARITY) 2473aef9a7bdSYoshihiro YUNOMAE up->fifo_bug = true; 24749196d8acSJiri Slaby } 24750ec3f585SPeter Hurley if (!(c_cflag & PARODD)) 24769196d8acSJiri Slaby cval |= UART_LCR_EPAR; 24779196d8acSJiri Slaby #ifdef CMSPAR 24780ec3f585SPeter Hurley if (c_cflag & CMSPAR) 24799196d8acSJiri Slaby cval |= UART_LCR_SPAR; 24809196d8acSJiri Slaby #endif 24819196d8acSJiri Slaby 24820ec3f585SPeter Hurley return cval; 24830ec3f585SPeter Hurley } 24840ec3f585SPeter Hurley 2485eb1527a8Skbuild test robot static void serial8250_set_divisor(struct uart_port *port, unsigned int baud, 248606a4c710SPeter Hurley unsigned int quot, unsigned int quot_frac) 2487e72abd5dSPeter Hurley { 2488e72abd5dSPeter Hurley struct uart_8250_port *up = up_to_u8250p(port); 2489e72abd5dSPeter Hurley 2490e72abd5dSPeter Hurley /* Workaround to enable 115200 baud on OMAP1510 internal ports */ 2491e72abd5dSPeter Hurley if (is_omap1510_8250(up)) { 2492e72abd5dSPeter Hurley if (baud == 115200) { 2493e72abd5dSPeter Hurley quot = 1; 2494e72abd5dSPeter Hurley serial_port_out(port, UART_OMAP_OSC_12M_SEL, 1); 2495e72abd5dSPeter Hurley } else 2496e72abd5dSPeter Hurley serial_port_out(port, UART_OMAP_OSC_12M_SEL, 0); 2497e72abd5dSPeter Hurley } 2498e72abd5dSPeter Hurley 2499e72abd5dSPeter Hurley /* 2500e72abd5dSPeter Hurley * For NatSemi, switch to bank 2 not bank 1, to avoid resetting EXCR2, 2501e72abd5dSPeter Hurley * otherwise just set DLAB 2502e72abd5dSPeter Hurley */ 2503e72abd5dSPeter Hurley if (up->capabilities & UART_NATSEMI) 2504e72abd5dSPeter Hurley serial_port_out(port, UART_LCR, 0xe0); 2505e72abd5dSPeter Hurley else 2506e72abd5dSPeter Hurley serial_port_out(port, UART_LCR, up->lcr | UART_LCR_DLAB); 2507e72abd5dSPeter Hurley 2508e72abd5dSPeter Hurley serial_dl_write(up, quot); 2509e72abd5dSPeter Hurley 251006a4c710SPeter Hurley /* XR17V35x UARTs have an extra fractional divisor register (DLD) */ 251106a4c710SPeter Hurley if (up->port.type == PORT_XR17V35X) 251206a4c710SPeter Hurley serial_port_out(port, 0x2, quot_frac); 2513e72abd5dSPeter Hurley } 2514e72abd5dSPeter Hurley 25150ec3f585SPeter Hurley void 25160ec3f585SPeter Hurley serial8250_do_set_termios(struct uart_port *port, struct ktermios *termios, 25170ec3f585SPeter Hurley struct ktermios *old) 25180ec3f585SPeter Hurley { 25190ec3f585SPeter Hurley struct uart_8250_port *up = up_to_u8250p(port); 25200ec3f585SPeter Hurley unsigned char cval; 25210ec3f585SPeter Hurley unsigned long flags; 252206a4c710SPeter Hurley unsigned int baud, quot, frac = 0; 25230ec3f585SPeter Hurley 25240ec3f585SPeter Hurley cval = serial8250_compute_lcr(up, termios->c_cflag); 25250ec3f585SPeter Hurley 25269196d8acSJiri Slaby /* 25279196d8acSJiri Slaby * Ask the core to calculate the divisor for us. 25289196d8acSJiri Slaby */ 25299196d8acSJiri Slaby baud = uart_get_baud_rate(port, termios, old, 25309196d8acSJiri Slaby port->uartclk / 16 / 0xffff, 25319196d8acSJiri Slaby port->uartclk / 16); 253206a4c710SPeter Hurley quot = serial8250_get_divisor(up, baud, &frac); 25339196d8acSJiri Slaby 2534e9cef862SPeter Hurley /* 2535e9cef862SPeter Hurley * Ok, we're now changing the port state. Do it with 2536e9cef862SPeter Hurley * interrupts disabled. 2537e9cef862SPeter Hurley */ 2538e9cef862SPeter Hurley serial8250_rpm_get(up); 2539e9cef862SPeter Hurley spin_lock_irqsave(&port->lock, flags); 2540e9cef862SPeter Hurley 2541e9cef862SPeter Hurley up->lcr = cval; /* Save computed LCR */ 2542e9cef862SPeter Hurley 25439196d8acSJiri Slaby if (up->capabilities & UART_CAP_FIFO && port->fifosize > 1) { 2544aef9a7bdSYoshihiro YUNOMAE /* NOTE: If fifo_bug is not set, a user can set RX_trigger. */ 2545aef9a7bdSYoshihiro YUNOMAE if ((baud < 2400 && !up->dma) || up->fifo_bug) { 2546aef9a7bdSYoshihiro YUNOMAE up->fcr &= ~UART_FCR_TRIGGER_MASK; 2547aef9a7bdSYoshihiro YUNOMAE up->fcr |= UART_FCR_TRIGGER_1; 25489196d8acSJiri Slaby } 25499196d8acSJiri Slaby } 25509196d8acSJiri Slaby 25519196d8acSJiri Slaby /* 25529196d8acSJiri Slaby * MCR-based auto flow control. When AFE is enabled, RTS will be 25539196d8acSJiri Slaby * deasserted when the receive FIFO contains more characters than 25549196d8acSJiri Slaby * the trigger, or the MCR RTS bit is cleared. In the case where 25559196d8acSJiri Slaby * the remote UART is not using CTS auto flow control, we must 25569196d8acSJiri Slaby * have sufficient FIFO entries for the latency of the remote 2557a6eec92eSPeter Hurley * UART to respond. IOW, at least 32 bytes of FIFO. 25589196d8acSJiri Slaby */ 2559a6eec92eSPeter Hurley if (up->capabilities & UART_CAP_AFE && port->fifosize >= 32) { 25609196d8acSJiri Slaby up->mcr &= ~UART_MCR_AFE; 25619196d8acSJiri Slaby if (termios->c_cflag & CRTSCTS) 25629196d8acSJiri Slaby up->mcr |= UART_MCR_AFE; 25639196d8acSJiri Slaby } 25649196d8acSJiri Slaby 25659196d8acSJiri Slaby /* 25669196d8acSJiri Slaby * Update the per-port timeout. 25679196d8acSJiri Slaby */ 25689196d8acSJiri Slaby uart_update_timeout(port, termios->c_cflag, baud); 25699196d8acSJiri Slaby 25709196d8acSJiri Slaby port->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR; 25719196d8acSJiri Slaby if (termios->c_iflag & INPCK) 25729196d8acSJiri Slaby port->read_status_mask |= UART_LSR_FE | UART_LSR_PE; 2573ef8b9ddcSPeter Hurley if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK)) 25749196d8acSJiri Slaby port->read_status_mask |= UART_LSR_BI; 25759196d8acSJiri Slaby 25769196d8acSJiri Slaby /* 25779196d8acSJiri Slaby * Characteres to ignore 25789196d8acSJiri Slaby */ 25799196d8acSJiri Slaby port->ignore_status_mask = 0; 25809196d8acSJiri Slaby if (termios->c_iflag & IGNPAR) 25819196d8acSJiri Slaby port->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE; 25829196d8acSJiri Slaby if (termios->c_iflag & IGNBRK) { 25839196d8acSJiri Slaby port->ignore_status_mask |= UART_LSR_BI; 25849196d8acSJiri Slaby /* 25859196d8acSJiri Slaby * If we're ignoring parity and break indicators, 25869196d8acSJiri Slaby * ignore overruns too (for real raw support). 25879196d8acSJiri Slaby */ 25889196d8acSJiri Slaby if (termios->c_iflag & IGNPAR) 25899196d8acSJiri Slaby port->ignore_status_mask |= UART_LSR_OE; 25909196d8acSJiri Slaby } 25919196d8acSJiri Slaby 25929196d8acSJiri Slaby /* 25939196d8acSJiri Slaby * ignore all characters if CREAD is not set 25949196d8acSJiri Slaby */ 25959196d8acSJiri Slaby if ((termios->c_cflag & CREAD) == 0) 25969196d8acSJiri Slaby port->ignore_status_mask |= UART_LSR_DR; 25979196d8acSJiri Slaby 25989196d8acSJiri Slaby /* 25999196d8acSJiri Slaby * CTS flow control flag and modem status interrupts 26009196d8acSJiri Slaby */ 26019196d8acSJiri Slaby up->ier &= ~UART_IER_MSI; 26029196d8acSJiri Slaby if (!(up->bugs & UART_BUG_NOMSR) && 26039196d8acSJiri Slaby UART_ENABLE_MS(&up->port, termios->c_cflag)) 26049196d8acSJiri Slaby up->ier |= UART_IER_MSI; 26059196d8acSJiri Slaby if (up->capabilities & UART_CAP_UUE) 26069196d8acSJiri Slaby up->ier |= UART_IER_UUE; 26079196d8acSJiri Slaby if (up->capabilities & UART_CAP_RTOIE) 26089196d8acSJiri Slaby up->ier |= UART_IER_RTOIE; 26099196d8acSJiri Slaby 26109196d8acSJiri Slaby serial_port_out(port, UART_IER, up->ier); 26119196d8acSJiri Slaby 26129196d8acSJiri Slaby if (up->capabilities & UART_CAP_EFR) { 26139196d8acSJiri Slaby unsigned char efr = 0; 26149196d8acSJiri Slaby /* 26159196d8acSJiri Slaby * TI16C752/Startech hardware flow control. FIXME: 26169196d8acSJiri Slaby * - TI16C752 requires control thresholds to be set. 26179196d8acSJiri Slaby * - UART_MCR_RTS is ineffective if auto-RTS mode is enabled. 26189196d8acSJiri Slaby */ 26199196d8acSJiri Slaby if (termios->c_cflag & CRTSCTS) 26209196d8acSJiri Slaby efr |= UART_EFR_CTS; 26219196d8acSJiri Slaby 26229196d8acSJiri Slaby serial_port_out(port, UART_LCR, UART_LCR_CONF_MODE_B); 26239196d8acSJiri Slaby if (port->flags & UPF_EXAR_EFR) 26249196d8acSJiri Slaby serial_port_out(port, UART_XR_EFR, efr); 26259196d8acSJiri Slaby else 26269196d8acSJiri Slaby serial_port_out(port, UART_EFR, efr); 26279196d8acSJiri Slaby } 26289196d8acSJiri Slaby 262906a4c710SPeter Hurley serial8250_set_divisor(port, baud, quot, frac); 263045a7bd63SJoe Schultz 263145a7bd63SJoe Schultz /* 26329196d8acSJiri Slaby * LCR DLAB must be set to enable 64-byte FIFO mode. If the FCR 26339196d8acSJiri Slaby * is written without DLAB set, this mode will be disabled. 26349196d8acSJiri Slaby */ 26359196d8acSJiri Slaby if (port->type == PORT_16750) 2636aef9a7bdSYoshihiro YUNOMAE serial_port_out(port, UART_FCR, up->fcr); 26379196d8acSJiri Slaby 2638e72abd5dSPeter Hurley serial_port_out(port, UART_LCR, up->lcr); /* reset DLAB */ 26399196d8acSJiri Slaby if (port->type != PORT_16750) { 26409196d8acSJiri Slaby /* emulated UARTs (Lucent Venus 167x) need two steps */ 2641aef9a7bdSYoshihiro YUNOMAE if (up->fcr & UART_FCR_ENABLE_FIFO) 26429196d8acSJiri Slaby serial_port_out(port, UART_FCR, UART_FCR_ENABLE_FIFO); 2643aef9a7bdSYoshihiro YUNOMAE serial_port_out(port, UART_FCR, up->fcr); /* set fcr */ 26449196d8acSJiri Slaby } 26459196d8acSJiri Slaby serial8250_set_mctrl(port, port->mctrl); 26469196d8acSJiri Slaby spin_unlock_irqrestore(&port->lock, flags); 2647d74d5d1bSSebastian Andrzej Siewior serial8250_rpm_put(up); 2648d74d5d1bSSebastian Andrzej Siewior 26499196d8acSJiri Slaby /* Don't rewrite B0 */ 26509196d8acSJiri Slaby if (tty_termios_baud_rate(termios)) 26519196d8acSJiri Slaby tty_termios_encode_baud_rate(termios, baud, baud); 26529196d8acSJiri Slaby } 26539196d8acSJiri Slaby EXPORT_SYMBOL(serial8250_do_set_termios); 26549196d8acSJiri Slaby 26559196d8acSJiri Slaby static void 26569196d8acSJiri Slaby serial8250_set_termios(struct uart_port *port, struct ktermios *termios, 26579196d8acSJiri Slaby struct ktermios *old) 26589196d8acSJiri Slaby { 26599196d8acSJiri Slaby if (port->set_termios) 26609196d8acSJiri Slaby port->set_termios(port, termios, old); 26619196d8acSJiri Slaby else 26629196d8acSJiri Slaby serial8250_do_set_termios(port, termios, old); 26639196d8acSJiri Slaby } 26649196d8acSJiri Slaby 26659196d8acSJiri Slaby static void 2666732a84a0SPeter Hurley serial8250_set_ldisc(struct uart_port *port, struct ktermios *termios) 26679196d8acSJiri Slaby { 2668732a84a0SPeter Hurley if (termios->c_line == N_PPS) { 26699196d8acSJiri Slaby port->flags |= UPF_HARDPPS_CD; 2670d41510ceSPeter Hurley spin_lock_irq(&port->lock); 26719196d8acSJiri Slaby serial8250_enable_ms(port); 2672d41510ceSPeter Hurley spin_unlock_irq(&port->lock); 2673cab68f89SPeter Hurley } else { 26749196d8acSJiri Slaby port->flags &= ~UPF_HARDPPS_CD; 2675cab68f89SPeter Hurley if (!UART_ENABLE_MS(port, termios->c_cflag)) { 2676cab68f89SPeter Hurley spin_lock_irq(&port->lock); 2677cab68f89SPeter Hurley serial8250_disable_ms(port); 2678cab68f89SPeter Hurley spin_unlock_irq(&port->lock); 2679cab68f89SPeter Hurley } 2680cab68f89SPeter Hurley } 26819196d8acSJiri Slaby } 26829196d8acSJiri Slaby 26839196d8acSJiri Slaby 26849196d8acSJiri Slaby void serial8250_do_pm(struct uart_port *port, unsigned int state, 26859196d8acSJiri Slaby unsigned int oldstate) 26869196d8acSJiri Slaby { 2687b1261c86SAndy Shevchenko struct uart_8250_port *p = up_to_u8250p(port); 26889196d8acSJiri Slaby 26899196d8acSJiri Slaby serial8250_set_sleep(p, state != 0); 26909196d8acSJiri Slaby } 26919196d8acSJiri Slaby EXPORT_SYMBOL(serial8250_do_pm); 26929196d8acSJiri Slaby 26939196d8acSJiri Slaby static void 26949196d8acSJiri Slaby serial8250_pm(struct uart_port *port, unsigned int state, 26959196d8acSJiri Slaby unsigned int oldstate) 26969196d8acSJiri Slaby { 26979196d8acSJiri Slaby if (port->pm) 26989196d8acSJiri Slaby port->pm(port, state, oldstate); 26999196d8acSJiri Slaby else 27009196d8acSJiri Slaby serial8250_do_pm(port, state, oldstate); 27019196d8acSJiri Slaby } 27029196d8acSJiri Slaby 27039196d8acSJiri Slaby static unsigned int serial8250_port_size(struct uart_8250_port *pt) 27049196d8acSJiri Slaby { 27059b8777e3SJohn Crispin if (pt->port.iotype == UPIO_AU) { 27069b8777e3SJohn Crispin if (pt->port.type == PORT_RT2880) 27079b8777e3SJohn Crispin return 0x100; 27089196d8acSJiri Slaby return 0x1000; 27099b8777e3SJohn Crispin } 27109196d8acSJiri Slaby if (is_omap1_8250(pt)) 27119196d8acSJiri Slaby return 0x16 << pt->port.regshift; 27129196d8acSJiri Slaby 27139196d8acSJiri Slaby return 8 << pt->port.regshift; 27149196d8acSJiri Slaby } 27159196d8acSJiri Slaby 27169196d8acSJiri Slaby /* 27179196d8acSJiri Slaby * Resource handling. 27189196d8acSJiri Slaby */ 27199196d8acSJiri Slaby static int serial8250_request_std_resource(struct uart_8250_port *up) 27209196d8acSJiri Slaby { 27219196d8acSJiri Slaby unsigned int size = serial8250_port_size(up); 27229196d8acSJiri Slaby struct uart_port *port = &up->port; 27239196d8acSJiri Slaby int ret = 0; 27249196d8acSJiri Slaby 27259196d8acSJiri Slaby switch (port->iotype) { 27269196d8acSJiri Slaby case UPIO_AU: 27279196d8acSJiri Slaby case UPIO_TSI: 27289196d8acSJiri Slaby case UPIO_MEM32: 27299196d8acSJiri Slaby case UPIO_MEM: 27309196d8acSJiri Slaby if (!port->mapbase) 27319196d8acSJiri Slaby break; 27329196d8acSJiri Slaby 27339196d8acSJiri Slaby if (!request_mem_region(port->mapbase, size, "serial")) { 27349196d8acSJiri Slaby ret = -EBUSY; 27359196d8acSJiri Slaby break; 27369196d8acSJiri Slaby } 27379196d8acSJiri Slaby 27389196d8acSJiri Slaby if (port->flags & UPF_IOREMAP) { 27399196d8acSJiri Slaby port->membase = ioremap_nocache(port->mapbase, size); 27409196d8acSJiri Slaby if (!port->membase) { 27419196d8acSJiri Slaby release_mem_region(port->mapbase, size); 27429196d8acSJiri Slaby ret = -ENOMEM; 27439196d8acSJiri Slaby } 27449196d8acSJiri Slaby } 27459196d8acSJiri Slaby break; 27469196d8acSJiri Slaby 27479196d8acSJiri Slaby case UPIO_HUB6: 27489196d8acSJiri Slaby case UPIO_PORT: 27499196d8acSJiri Slaby if (!request_region(port->iobase, size, "serial")) 27509196d8acSJiri Slaby ret = -EBUSY; 27519196d8acSJiri Slaby break; 27529196d8acSJiri Slaby } 27539196d8acSJiri Slaby return ret; 27549196d8acSJiri Slaby } 27559196d8acSJiri Slaby 27569196d8acSJiri Slaby static void serial8250_release_std_resource(struct uart_8250_port *up) 27579196d8acSJiri Slaby { 27589196d8acSJiri Slaby unsigned int size = serial8250_port_size(up); 27599196d8acSJiri Slaby struct uart_port *port = &up->port; 27609196d8acSJiri Slaby 27619196d8acSJiri Slaby switch (port->iotype) { 27629196d8acSJiri Slaby case UPIO_AU: 27639196d8acSJiri Slaby case UPIO_TSI: 27649196d8acSJiri Slaby case UPIO_MEM32: 27659196d8acSJiri Slaby case UPIO_MEM: 27669196d8acSJiri Slaby if (!port->mapbase) 27679196d8acSJiri Slaby break; 27689196d8acSJiri Slaby 27699196d8acSJiri Slaby if (port->flags & UPF_IOREMAP) { 27709196d8acSJiri Slaby iounmap(port->membase); 27719196d8acSJiri Slaby port->membase = NULL; 27729196d8acSJiri Slaby } 27739196d8acSJiri Slaby 27749196d8acSJiri Slaby release_mem_region(port->mapbase, size); 27759196d8acSJiri Slaby break; 27769196d8acSJiri Slaby 27779196d8acSJiri Slaby case UPIO_HUB6: 27789196d8acSJiri Slaby case UPIO_PORT: 27799196d8acSJiri Slaby release_region(port->iobase, size); 27809196d8acSJiri Slaby break; 27819196d8acSJiri Slaby } 27829196d8acSJiri Slaby } 27839196d8acSJiri Slaby 27849196d8acSJiri Slaby static int serial8250_request_rsa_resource(struct uart_8250_port *up) 27859196d8acSJiri Slaby { 27869196d8acSJiri Slaby unsigned long start = UART_RSA_BASE << up->port.regshift; 27879196d8acSJiri Slaby unsigned int size = 8 << up->port.regshift; 27889196d8acSJiri Slaby struct uart_port *port = &up->port; 27899196d8acSJiri Slaby int ret = -EINVAL; 27909196d8acSJiri Slaby 27919196d8acSJiri Slaby switch (port->iotype) { 27929196d8acSJiri Slaby case UPIO_HUB6: 27939196d8acSJiri Slaby case UPIO_PORT: 27949196d8acSJiri Slaby start += port->iobase; 27959196d8acSJiri Slaby if (request_region(start, size, "serial-rsa")) 27969196d8acSJiri Slaby ret = 0; 27979196d8acSJiri Slaby else 27989196d8acSJiri Slaby ret = -EBUSY; 27999196d8acSJiri Slaby break; 28009196d8acSJiri Slaby } 28019196d8acSJiri Slaby 28029196d8acSJiri Slaby return ret; 28039196d8acSJiri Slaby } 28049196d8acSJiri Slaby 28059196d8acSJiri Slaby static void serial8250_release_rsa_resource(struct uart_8250_port *up) 28069196d8acSJiri Slaby { 28079196d8acSJiri Slaby unsigned long offset = UART_RSA_BASE << up->port.regshift; 28089196d8acSJiri Slaby unsigned int size = 8 << up->port.regshift; 28099196d8acSJiri Slaby struct uart_port *port = &up->port; 28109196d8acSJiri Slaby 28119196d8acSJiri Slaby switch (port->iotype) { 28129196d8acSJiri Slaby case UPIO_HUB6: 28139196d8acSJiri Slaby case UPIO_PORT: 28149196d8acSJiri Slaby release_region(port->iobase + offset, size); 28159196d8acSJiri Slaby break; 28169196d8acSJiri Slaby } 28179196d8acSJiri Slaby } 28189196d8acSJiri Slaby 28199196d8acSJiri Slaby static void serial8250_release_port(struct uart_port *port) 28209196d8acSJiri Slaby { 2821b1261c86SAndy Shevchenko struct uart_8250_port *up = up_to_u8250p(port); 28229196d8acSJiri Slaby 28239196d8acSJiri Slaby serial8250_release_std_resource(up); 28249196d8acSJiri Slaby if (port->type == PORT_RSA) 28259196d8acSJiri Slaby serial8250_release_rsa_resource(up); 28269196d8acSJiri Slaby } 28279196d8acSJiri Slaby 28289196d8acSJiri Slaby static int serial8250_request_port(struct uart_port *port) 28299196d8acSJiri Slaby { 2830b1261c86SAndy Shevchenko struct uart_8250_port *up = up_to_u8250p(port); 28319196d8acSJiri Slaby int ret; 28329196d8acSJiri Slaby 28339196d8acSJiri Slaby if (port->type == PORT_8250_CIR) 28349196d8acSJiri Slaby return -ENODEV; 28359196d8acSJiri Slaby 28369196d8acSJiri Slaby ret = serial8250_request_std_resource(up); 28379196d8acSJiri Slaby if (ret == 0 && port->type == PORT_RSA) { 28389196d8acSJiri Slaby ret = serial8250_request_rsa_resource(up); 28399196d8acSJiri Slaby if (ret < 0) 28409196d8acSJiri Slaby serial8250_release_std_resource(up); 28419196d8acSJiri Slaby } 28429196d8acSJiri Slaby 28439196d8acSJiri Slaby return ret; 28449196d8acSJiri Slaby } 28459196d8acSJiri Slaby 2846aef9a7bdSYoshihiro YUNOMAE static int fcr_get_rxtrig_bytes(struct uart_8250_port *up) 2847aef9a7bdSYoshihiro YUNOMAE { 2848aef9a7bdSYoshihiro YUNOMAE const struct serial8250_config *conf_type = &uart_config[up->port.type]; 2849aef9a7bdSYoshihiro YUNOMAE unsigned char bytes; 2850aef9a7bdSYoshihiro YUNOMAE 2851aef9a7bdSYoshihiro YUNOMAE bytes = conf_type->rxtrig_bytes[UART_FCR_R_TRIG_BITS(up->fcr)]; 2852aef9a7bdSYoshihiro YUNOMAE 2853aef9a7bdSYoshihiro YUNOMAE return bytes ? bytes : -EOPNOTSUPP; 2854aef9a7bdSYoshihiro YUNOMAE } 2855aef9a7bdSYoshihiro YUNOMAE 2856aef9a7bdSYoshihiro YUNOMAE static int bytes_to_fcr_rxtrig(struct uart_8250_port *up, unsigned char bytes) 2857aef9a7bdSYoshihiro YUNOMAE { 2858aef9a7bdSYoshihiro YUNOMAE const struct serial8250_config *conf_type = &uart_config[up->port.type]; 2859aef9a7bdSYoshihiro YUNOMAE int i; 2860aef9a7bdSYoshihiro YUNOMAE 2861aef9a7bdSYoshihiro YUNOMAE if (!conf_type->rxtrig_bytes[UART_FCR_R_TRIG_BITS(UART_FCR_R_TRIG_00)]) 2862aef9a7bdSYoshihiro YUNOMAE return -EOPNOTSUPP; 2863aef9a7bdSYoshihiro YUNOMAE 2864aef9a7bdSYoshihiro YUNOMAE for (i = 1; i < UART_FCR_R_TRIG_MAX_STATE; i++) { 2865aef9a7bdSYoshihiro YUNOMAE if (bytes < conf_type->rxtrig_bytes[i]) 2866aef9a7bdSYoshihiro YUNOMAE /* Use the nearest lower value */ 2867aef9a7bdSYoshihiro YUNOMAE return (--i) << UART_FCR_R_TRIG_SHIFT; 2868aef9a7bdSYoshihiro YUNOMAE } 2869aef9a7bdSYoshihiro YUNOMAE 2870aef9a7bdSYoshihiro YUNOMAE return UART_FCR_R_TRIG_11; 2871aef9a7bdSYoshihiro YUNOMAE } 2872aef9a7bdSYoshihiro YUNOMAE 2873aef9a7bdSYoshihiro YUNOMAE static int do_get_rxtrig(struct tty_port *port) 2874aef9a7bdSYoshihiro YUNOMAE { 2875aef9a7bdSYoshihiro YUNOMAE struct uart_state *state = container_of(port, struct uart_state, port); 2876aef9a7bdSYoshihiro YUNOMAE struct uart_port *uport = state->uart_port; 2877aef9a7bdSYoshihiro YUNOMAE struct uart_8250_port *up = 2878aef9a7bdSYoshihiro YUNOMAE container_of(uport, struct uart_8250_port, port); 2879aef9a7bdSYoshihiro YUNOMAE 2880aef9a7bdSYoshihiro YUNOMAE if (!(up->capabilities & UART_CAP_FIFO) || uport->fifosize <= 1) 2881aef9a7bdSYoshihiro YUNOMAE return -EINVAL; 2882aef9a7bdSYoshihiro YUNOMAE 2883aef9a7bdSYoshihiro YUNOMAE return fcr_get_rxtrig_bytes(up); 2884aef9a7bdSYoshihiro YUNOMAE } 2885aef9a7bdSYoshihiro YUNOMAE 2886aef9a7bdSYoshihiro YUNOMAE static int do_serial8250_get_rxtrig(struct tty_port *port) 2887aef9a7bdSYoshihiro YUNOMAE { 2888aef9a7bdSYoshihiro YUNOMAE int rxtrig_bytes; 2889aef9a7bdSYoshihiro YUNOMAE 2890aef9a7bdSYoshihiro YUNOMAE mutex_lock(&port->mutex); 2891aef9a7bdSYoshihiro YUNOMAE rxtrig_bytes = do_get_rxtrig(port); 2892aef9a7bdSYoshihiro YUNOMAE mutex_unlock(&port->mutex); 2893aef9a7bdSYoshihiro YUNOMAE 2894aef9a7bdSYoshihiro YUNOMAE return rxtrig_bytes; 2895aef9a7bdSYoshihiro YUNOMAE } 2896aef9a7bdSYoshihiro YUNOMAE 2897aef9a7bdSYoshihiro YUNOMAE static ssize_t serial8250_get_attr_rx_trig_bytes(struct device *dev, 2898aef9a7bdSYoshihiro YUNOMAE struct device_attribute *attr, char *buf) 2899aef9a7bdSYoshihiro YUNOMAE { 2900aef9a7bdSYoshihiro YUNOMAE struct tty_port *port = dev_get_drvdata(dev); 2901aef9a7bdSYoshihiro YUNOMAE int rxtrig_bytes; 2902aef9a7bdSYoshihiro YUNOMAE 2903aef9a7bdSYoshihiro YUNOMAE rxtrig_bytes = do_serial8250_get_rxtrig(port); 2904aef9a7bdSYoshihiro YUNOMAE if (rxtrig_bytes < 0) 2905aef9a7bdSYoshihiro YUNOMAE return rxtrig_bytes; 2906aef9a7bdSYoshihiro YUNOMAE 2907aef9a7bdSYoshihiro YUNOMAE return snprintf(buf, PAGE_SIZE, "%d\n", rxtrig_bytes); 2908aef9a7bdSYoshihiro YUNOMAE } 2909aef9a7bdSYoshihiro YUNOMAE 2910aef9a7bdSYoshihiro YUNOMAE static int do_set_rxtrig(struct tty_port *port, unsigned char bytes) 2911aef9a7bdSYoshihiro YUNOMAE { 2912aef9a7bdSYoshihiro YUNOMAE struct uart_state *state = container_of(port, struct uart_state, port); 2913aef9a7bdSYoshihiro YUNOMAE struct uart_port *uport = state->uart_port; 2914aef9a7bdSYoshihiro YUNOMAE struct uart_8250_port *up = 2915aef9a7bdSYoshihiro YUNOMAE container_of(uport, struct uart_8250_port, port); 2916aef9a7bdSYoshihiro YUNOMAE int rxtrig; 2917aef9a7bdSYoshihiro YUNOMAE 2918aef9a7bdSYoshihiro YUNOMAE if (!(up->capabilities & UART_CAP_FIFO) || uport->fifosize <= 1 || 2919aef9a7bdSYoshihiro YUNOMAE up->fifo_bug) 2920aef9a7bdSYoshihiro YUNOMAE return -EINVAL; 2921aef9a7bdSYoshihiro YUNOMAE 2922aef9a7bdSYoshihiro YUNOMAE rxtrig = bytes_to_fcr_rxtrig(up, bytes); 2923aef9a7bdSYoshihiro YUNOMAE if (rxtrig < 0) 2924aef9a7bdSYoshihiro YUNOMAE return rxtrig; 2925aef9a7bdSYoshihiro YUNOMAE 2926aef9a7bdSYoshihiro YUNOMAE serial8250_clear_fifos(up); 2927aef9a7bdSYoshihiro YUNOMAE up->fcr &= ~UART_FCR_TRIGGER_MASK; 2928aef9a7bdSYoshihiro YUNOMAE up->fcr |= (unsigned char)rxtrig; 2929aef9a7bdSYoshihiro YUNOMAE serial_out(up, UART_FCR, up->fcr); 2930aef9a7bdSYoshihiro YUNOMAE return 0; 2931aef9a7bdSYoshihiro YUNOMAE } 2932aef9a7bdSYoshihiro YUNOMAE 2933aef9a7bdSYoshihiro YUNOMAE static int do_serial8250_set_rxtrig(struct tty_port *port, unsigned char bytes) 2934aef9a7bdSYoshihiro YUNOMAE { 2935aef9a7bdSYoshihiro YUNOMAE int ret; 2936aef9a7bdSYoshihiro YUNOMAE 2937aef9a7bdSYoshihiro YUNOMAE mutex_lock(&port->mutex); 2938aef9a7bdSYoshihiro YUNOMAE ret = do_set_rxtrig(port, bytes); 2939aef9a7bdSYoshihiro YUNOMAE mutex_unlock(&port->mutex); 2940aef9a7bdSYoshihiro YUNOMAE 2941aef9a7bdSYoshihiro YUNOMAE return ret; 2942aef9a7bdSYoshihiro YUNOMAE } 2943aef9a7bdSYoshihiro YUNOMAE 2944aef9a7bdSYoshihiro YUNOMAE static ssize_t serial8250_set_attr_rx_trig_bytes(struct device *dev, 2945aef9a7bdSYoshihiro YUNOMAE struct device_attribute *attr, const char *buf, size_t count) 2946aef9a7bdSYoshihiro YUNOMAE { 2947aef9a7bdSYoshihiro YUNOMAE struct tty_port *port = dev_get_drvdata(dev); 2948aef9a7bdSYoshihiro YUNOMAE unsigned char bytes; 2949aef9a7bdSYoshihiro YUNOMAE int ret; 2950aef9a7bdSYoshihiro YUNOMAE 2951aef9a7bdSYoshihiro YUNOMAE if (!count) 2952aef9a7bdSYoshihiro YUNOMAE return -EINVAL; 2953aef9a7bdSYoshihiro YUNOMAE 2954aef9a7bdSYoshihiro YUNOMAE ret = kstrtou8(buf, 10, &bytes); 2955aef9a7bdSYoshihiro YUNOMAE if (ret < 0) 2956aef9a7bdSYoshihiro YUNOMAE return ret; 2957aef9a7bdSYoshihiro YUNOMAE 2958aef9a7bdSYoshihiro YUNOMAE ret = do_serial8250_set_rxtrig(port, bytes); 2959aef9a7bdSYoshihiro YUNOMAE if (ret < 0) 2960aef9a7bdSYoshihiro YUNOMAE return ret; 2961aef9a7bdSYoshihiro YUNOMAE 2962aef9a7bdSYoshihiro YUNOMAE return count; 2963aef9a7bdSYoshihiro YUNOMAE } 2964aef9a7bdSYoshihiro YUNOMAE 2965aef9a7bdSYoshihiro YUNOMAE static DEVICE_ATTR(rx_trig_bytes, S_IRUSR | S_IWUSR | S_IRGRP, 2966aef9a7bdSYoshihiro YUNOMAE serial8250_get_attr_rx_trig_bytes, 2967aef9a7bdSYoshihiro YUNOMAE serial8250_set_attr_rx_trig_bytes); 2968aef9a7bdSYoshihiro YUNOMAE 2969aef9a7bdSYoshihiro YUNOMAE static struct attribute *serial8250_dev_attrs[] = { 2970aef9a7bdSYoshihiro YUNOMAE &dev_attr_rx_trig_bytes.attr, 2971aef9a7bdSYoshihiro YUNOMAE NULL, 2972aef9a7bdSYoshihiro YUNOMAE }; 2973aef9a7bdSYoshihiro YUNOMAE 2974aef9a7bdSYoshihiro YUNOMAE static struct attribute_group serial8250_dev_attr_group = { 2975aef9a7bdSYoshihiro YUNOMAE .attrs = serial8250_dev_attrs, 2976aef9a7bdSYoshihiro YUNOMAE }; 2977aef9a7bdSYoshihiro YUNOMAE 2978aef9a7bdSYoshihiro YUNOMAE static void register_dev_spec_attr_grp(struct uart_8250_port *up) 2979aef9a7bdSYoshihiro YUNOMAE { 2980aef9a7bdSYoshihiro YUNOMAE const struct serial8250_config *conf_type = &uart_config[up->port.type]; 2981aef9a7bdSYoshihiro YUNOMAE 2982aef9a7bdSYoshihiro YUNOMAE if (conf_type->rxtrig_bytes[0]) 2983aef9a7bdSYoshihiro YUNOMAE up->port.attr_group = &serial8250_dev_attr_group; 2984aef9a7bdSYoshihiro YUNOMAE } 2985aef9a7bdSYoshihiro YUNOMAE 29869196d8acSJiri Slaby static void serial8250_config_port(struct uart_port *port, int flags) 29879196d8acSJiri Slaby { 2988b1261c86SAndy Shevchenko struct uart_8250_port *up = up_to_u8250p(port); 29899196d8acSJiri Slaby int probeflags = PROBE_ANY; 29909196d8acSJiri Slaby int ret; 29919196d8acSJiri Slaby 29929196d8acSJiri Slaby if (port->type == PORT_8250_CIR) 29939196d8acSJiri Slaby return; 29949196d8acSJiri Slaby 29959196d8acSJiri Slaby /* 29969196d8acSJiri Slaby * Find the region that we can probe for. This in turn 29979196d8acSJiri Slaby * tells us whether we can probe for the type of port. 29989196d8acSJiri Slaby */ 29999196d8acSJiri Slaby ret = serial8250_request_std_resource(up); 30009196d8acSJiri Slaby if (ret < 0) 30019196d8acSJiri Slaby return; 30029196d8acSJiri Slaby 30039196d8acSJiri Slaby ret = serial8250_request_rsa_resource(up); 30049196d8acSJiri Slaby if (ret < 0) 30059196d8acSJiri Slaby probeflags &= ~PROBE_RSA; 30069196d8acSJiri Slaby 30079196d8acSJiri Slaby if (port->iotype != up->cur_iotype) 30089196d8acSJiri Slaby set_io_from_upio(port); 30099196d8acSJiri Slaby 30109196d8acSJiri Slaby if (flags & UART_CONFIG_TYPE) 30119196d8acSJiri Slaby autoconfig(up, probeflags); 30129196d8acSJiri Slaby 30139196d8acSJiri Slaby /* if access method is AU, it is a 16550 with a quirk */ 30149196d8acSJiri Slaby if (port->type == PORT_16550A && port->iotype == UPIO_AU) 30159196d8acSJiri Slaby up->bugs |= UART_BUG_NOMSR; 30169196d8acSJiri Slaby 30173685f19eSStephen Warren /* HW bugs may trigger IRQ while IIR == NO_INT */ 30183685f19eSStephen Warren if (port->type == PORT_TEGRA) 30193685f19eSStephen Warren up->bugs |= UART_BUG_NOMSR; 30203685f19eSStephen Warren 30219196d8acSJiri Slaby if (port->type != PORT_UNKNOWN && flags & UART_CONFIG_IRQ) 30229196d8acSJiri Slaby autoconfig_irq(up); 30239196d8acSJiri Slaby 30249196d8acSJiri Slaby if (port->type != PORT_RSA && probeflags & PROBE_RSA) 30259196d8acSJiri Slaby serial8250_release_rsa_resource(up); 30269196d8acSJiri Slaby if (port->type == PORT_UNKNOWN) 30279196d8acSJiri Slaby serial8250_release_std_resource(up); 30289196d8acSJiri Slaby 30299196d8acSJiri Slaby /* Fixme: probably not the best place for this */ 30309196d8acSJiri Slaby if ((port->type == PORT_XR17V35X) || 30319196d8acSJiri Slaby (port->type == PORT_XR17D15X)) 30329196d8acSJiri Slaby port->handle_irq = exar_handle_irq; 3033aef9a7bdSYoshihiro YUNOMAE 3034aef9a7bdSYoshihiro YUNOMAE register_dev_spec_attr_grp(up); 3035aef9a7bdSYoshihiro YUNOMAE up->fcr = uart_config[up->port.type].fcr; 30369196d8acSJiri Slaby } 30379196d8acSJiri Slaby 30389196d8acSJiri Slaby static int 30399196d8acSJiri Slaby serial8250_verify_port(struct uart_port *port, struct serial_struct *ser) 30409196d8acSJiri Slaby { 30419196d8acSJiri Slaby if (ser->irq >= nr_irqs || ser->irq < 0 || 30429196d8acSJiri Slaby ser->baud_base < 9600 || ser->type < PORT_UNKNOWN || 30439196d8acSJiri Slaby ser->type >= ARRAY_SIZE(uart_config) || ser->type == PORT_CIRRUS || 30449196d8acSJiri Slaby ser->type == PORT_STARTECH) 30459196d8acSJiri Slaby return -EINVAL; 30469196d8acSJiri Slaby return 0; 30479196d8acSJiri Slaby } 30489196d8acSJiri Slaby 30499196d8acSJiri Slaby static const char * 30509196d8acSJiri Slaby serial8250_type(struct uart_port *port) 30519196d8acSJiri Slaby { 30529196d8acSJiri Slaby int type = port->type; 30539196d8acSJiri Slaby 30549196d8acSJiri Slaby if (type >= ARRAY_SIZE(uart_config)) 30559196d8acSJiri Slaby type = 0; 30569196d8acSJiri Slaby return uart_config[type].name; 30579196d8acSJiri Slaby } 30589196d8acSJiri Slaby 30599196d8acSJiri Slaby static struct uart_ops serial8250_pops = { 30609196d8acSJiri Slaby .tx_empty = serial8250_tx_empty, 30619196d8acSJiri Slaby .set_mctrl = serial8250_set_mctrl, 30629196d8acSJiri Slaby .get_mctrl = serial8250_get_mctrl, 30639196d8acSJiri Slaby .stop_tx = serial8250_stop_tx, 30649196d8acSJiri Slaby .start_tx = serial8250_start_tx, 3065234abab1SSebastian Andrzej Siewior .throttle = serial8250_throttle, 3066234abab1SSebastian Andrzej Siewior .unthrottle = serial8250_unthrottle, 30679196d8acSJiri Slaby .stop_rx = serial8250_stop_rx, 30689196d8acSJiri Slaby .enable_ms = serial8250_enable_ms, 30699196d8acSJiri Slaby .break_ctl = serial8250_break_ctl, 30709196d8acSJiri Slaby .startup = serial8250_startup, 30719196d8acSJiri Slaby .shutdown = serial8250_shutdown, 30729196d8acSJiri Slaby .set_termios = serial8250_set_termios, 30739196d8acSJiri Slaby .set_ldisc = serial8250_set_ldisc, 30749196d8acSJiri Slaby .pm = serial8250_pm, 30759196d8acSJiri Slaby .type = serial8250_type, 30769196d8acSJiri Slaby .release_port = serial8250_release_port, 30779196d8acSJiri Slaby .request_port = serial8250_request_port, 30789196d8acSJiri Slaby .config_port = serial8250_config_port, 30799196d8acSJiri Slaby .verify_port = serial8250_verify_port, 30809196d8acSJiri Slaby #ifdef CONFIG_CONSOLE_POLL 30819196d8acSJiri Slaby .poll_get_char = serial8250_get_poll_char, 30829196d8acSJiri Slaby .poll_put_char = serial8250_put_poll_char, 30839196d8acSJiri Slaby #endif 30849196d8acSJiri Slaby }; 30859196d8acSJiri Slaby 30869196d8acSJiri Slaby static struct uart_8250_port serial8250_ports[UART_NR]; 30879196d8acSJiri Slaby 3088ae14a795SSebastian Andrzej Siewior /** 3089ae14a795SSebastian Andrzej Siewior * serial8250_get_port - retrieve struct uart_8250_port 3090ae14a795SSebastian Andrzej Siewior * @line: serial line number 3091ae14a795SSebastian Andrzej Siewior * 3092ae14a795SSebastian Andrzej Siewior * This function retrieves struct uart_8250_port for the specific line. 3093ae14a795SSebastian Andrzej Siewior * This struct *must* *not* be used to perform a 8250 or serial core operation 3094ae14a795SSebastian Andrzej Siewior * which is not accessible otherwise. Its only purpose is to make the struct 3095ae14a795SSebastian Andrzej Siewior * accessible to the runtime-pm callbacks for context suspend/restore. 3096ae14a795SSebastian Andrzej Siewior * The lock assumption made here is none because runtime-pm suspend/resume 3097ae14a795SSebastian Andrzej Siewior * callbacks should not be invoked if there is any operation performed on the 3098ae14a795SSebastian Andrzej Siewior * port. 3099ae14a795SSebastian Andrzej Siewior */ 3100ae14a795SSebastian Andrzej Siewior struct uart_8250_port *serial8250_get_port(int line) 3101ae14a795SSebastian Andrzej Siewior { 3102ae14a795SSebastian Andrzej Siewior return &serial8250_ports[line]; 3103ae14a795SSebastian Andrzej Siewior } 3104ae14a795SSebastian Andrzej Siewior EXPORT_SYMBOL_GPL(serial8250_get_port); 3105ae14a795SSebastian Andrzej Siewior 31069196d8acSJiri Slaby static void (*serial8250_isa_config)(int port, struct uart_port *up, 31079196d8acSJiri Slaby unsigned short *capabilities); 31089196d8acSJiri Slaby 31099196d8acSJiri Slaby void serial8250_set_isa_configurator( 31109196d8acSJiri Slaby void (*v)(int port, struct uart_port *up, unsigned short *capabilities)) 31119196d8acSJiri Slaby { 31129196d8acSJiri Slaby serial8250_isa_config = v; 31139196d8acSJiri Slaby } 31149196d8acSJiri Slaby EXPORT_SYMBOL(serial8250_set_isa_configurator); 31159196d8acSJiri Slaby 31169196d8acSJiri Slaby static void __init serial8250_isa_init_ports(void) 31179196d8acSJiri Slaby { 31189196d8acSJiri Slaby struct uart_8250_port *up; 31199196d8acSJiri Slaby static int first = 1; 31209196d8acSJiri Slaby int i, irqflag = 0; 31219196d8acSJiri Slaby 31229196d8acSJiri Slaby if (!first) 31239196d8acSJiri Slaby return; 31249196d8acSJiri Slaby first = 0; 31259196d8acSJiri Slaby 31269196d8acSJiri Slaby if (nr_uarts > UART_NR) 31279196d8acSJiri Slaby nr_uarts = UART_NR; 31289196d8acSJiri Slaby 3129317a6842SKyle McMartin for (i = 0; i < nr_uarts; i++) { 31309196d8acSJiri Slaby struct uart_8250_port *up = &serial8250_ports[i]; 31319196d8acSJiri Slaby struct uart_port *port = &up->port; 31329196d8acSJiri Slaby 31339196d8acSJiri Slaby port->line = i; 31349196d8acSJiri Slaby spin_lock_init(&port->lock); 31359196d8acSJiri Slaby 31369196d8acSJiri Slaby init_timer(&up->timer); 31379196d8acSJiri Slaby up->timer.function = serial8250_timeout; 31389196d8acSJiri Slaby up->cur_iotype = 0xFF; 31399196d8acSJiri Slaby 31409196d8acSJiri Slaby /* 31419196d8acSJiri Slaby * ALPHA_KLUDGE_MCR needs to be killed. 31429196d8acSJiri Slaby */ 31439196d8acSJiri Slaby up->mcr_mask = ~ALPHA_KLUDGE_MCR; 31449196d8acSJiri Slaby up->mcr_force = ALPHA_KLUDGE_MCR; 31459196d8acSJiri Slaby 31469196d8acSJiri Slaby port->ops = &serial8250_pops; 31479196d8acSJiri Slaby } 31489196d8acSJiri Slaby 31499196d8acSJiri Slaby if (share_irqs) 31509196d8acSJiri Slaby irqflag = IRQF_SHARED; 31519196d8acSJiri Slaby 31529196d8acSJiri Slaby for (i = 0, up = serial8250_ports; 31539196d8acSJiri Slaby i < ARRAY_SIZE(old_serial_port) && i < nr_uarts; 31549196d8acSJiri Slaby i++, up++) { 31559196d8acSJiri Slaby struct uart_port *port = &up->port; 31569196d8acSJiri Slaby 31579196d8acSJiri Slaby port->iobase = old_serial_port[i].port; 31589196d8acSJiri Slaby port->irq = irq_canonicalize(old_serial_port[i].irq); 31599196d8acSJiri Slaby port->irqflags = old_serial_port[i].irqflags; 31609196d8acSJiri Slaby port->uartclk = old_serial_port[i].baud_base * 16; 31619196d8acSJiri Slaby port->flags = old_serial_port[i].flags; 31629196d8acSJiri Slaby port->hub6 = old_serial_port[i].hub6; 31639196d8acSJiri Slaby port->membase = old_serial_port[i].iomem_base; 31649196d8acSJiri Slaby port->iotype = old_serial_port[i].io_type; 31659196d8acSJiri Slaby port->regshift = old_serial_port[i].iomem_reg_shift; 31669196d8acSJiri Slaby set_io_from_upio(port); 31679196d8acSJiri Slaby port->irqflags |= irqflag; 31689196d8acSJiri Slaby if (serial8250_isa_config != NULL) 31699196d8acSJiri Slaby serial8250_isa_config(i, &up->port, &up->capabilities); 31709196d8acSJiri Slaby 31719196d8acSJiri Slaby } 31729196d8acSJiri Slaby } 31739196d8acSJiri Slaby 31749196d8acSJiri Slaby static void 31759196d8acSJiri Slaby serial8250_init_fixed_type_port(struct uart_8250_port *up, unsigned int type) 31769196d8acSJiri Slaby { 31779196d8acSJiri Slaby up->port.type = type; 31789196d8acSJiri Slaby if (!up->port.fifosize) 31799196d8acSJiri Slaby up->port.fifosize = uart_config[type].fifo_size; 31809196d8acSJiri Slaby if (!up->tx_loadsz) 31819196d8acSJiri Slaby up->tx_loadsz = uart_config[type].tx_loadsz; 31829196d8acSJiri Slaby if (!up->capabilities) 31839196d8acSJiri Slaby up->capabilities = uart_config[type].flags; 31849196d8acSJiri Slaby } 31859196d8acSJiri Slaby 31869196d8acSJiri Slaby static void __init 31879196d8acSJiri Slaby serial8250_register_ports(struct uart_driver *drv, struct device *dev) 31889196d8acSJiri Slaby { 31899196d8acSJiri Slaby int i; 31909196d8acSJiri Slaby 31919196d8acSJiri Slaby for (i = 0; i < nr_uarts; i++) { 31929196d8acSJiri Slaby struct uart_8250_port *up = &serial8250_ports[i]; 31939196d8acSJiri Slaby 31949196d8acSJiri Slaby if (up->port.dev) 31959196d8acSJiri Slaby continue; 31969196d8acSJiri Slaby 31979196d8acSJiri Slaby up->port.dev = dev; 31989196d8acSJiri Slaby 3199e13cb72bSPeter Hurley if (skip_txen_test) 3200e13cb72bSPeter Hurley up->port.flags |= UPF_NO_TXEN_TEST; 3201e13cb72bSPeter Hurley 32029196d8acSJiri Slaby if (up->port.flags & UPF_FIXED_TYPE) 32039196d8acSJiri Slaby serial8250_init_fixed_type_port(up, up->port.type); 32049196d8acSJiri Slaby 32059196d8acSJiri Slaby uart_add_one_port(drv, &up->port); 32069196d8acSJiri Slaby } 32079196d8acSJiri Slaby } 32089196d8acSJiri Slaby 32099196d8acSJiri Slaby #ifdef CONFIG_SERIAL_8250_CONSOLE 32109196d8acSJiri Slaby 32119196d8acSJiri Slaby static void serial8250_console_putchar(struct uart_port *port, int ch) 32129196d8acSJiri Slaby { 3213b1261c86SAndy Shevchenko struct uart_8250_port *up = up_to_u8250p(port); 32149196d8acSJiri Slaby 32159196d8acSJiri Slaby wait_for_xmitr(up, UART_LSR_THRE); 32169196d8acSJiri Slaby serial_port_out(port, UART_TX, ch); 32179196d8acSJiri Slaby } 32189196d8acSJiri Slaby 32199196d8acSJiri Slaby /* 32209196d8acSJiri Slaby * Print a string to the serial port trying not to disturb 32219196d8acSJiri Slaby * any possible real use of the port... 32229196d8acSJiri Slaby * 32239196d8acSJiri Slaby * The console_lock must be held when we get here. 32249196d8acSJiri Slaby */ 32259196d8acSJiri Slaby static void 32269196d8acSJiri Slaby serial8250_console_write(struct console *co, const char *s, unsigned int count) 32279196d8acSJiri Slaby { 32289196d8acSJiri Slaby struct uart_8250_port *up = &serial8250_ports[co->index]; 32299196d8acSJiri Slaby struct uart_port *port = &up->port; 32309196d8acSJiri Slaby unsigned long flags; 32319196d8acSJiri Slaby unsigned int ier; 32329196d8acSJiri Slaby int locked = 1; 32339196d8acSJiri Slaby 32349196d8acSJiri Slaby touch_nmi_watchdog(); 32359196d8acSJiri Slaby 3236d74d5d1bSSebastian Andrzej Siewior serial8250_rpm_get(up); 3237d74d5d1bSSebastian Andrzej Siewior 32386fad18faSRabin Vincent if (port->sysrq) 32396fad18faSRabin Vincent locked = 0; 32406fad18faSRabin Vincent else if (oops_in_progress) 3241ebade5e8SIngo Molnar locked = spin_trylock_irqsave(&port->lock, flags); 3242ebade5e8SIngo Molnar else 3243ebade5e8SIngo Molnar spin_lock_irqsave(&port->lock, flags); 32449196d8acSJiri Slaby 32459196d8acSJiri Slaby /* 32469196d8acSJiri Slaby * First save the IER then disable the interrupts 32479196d8acSJiri Slaby */ 32489196d8acSJiri Slaby ier = serial_port_in(port, UART_IER); 32499196d8acSJiri Slaby 32509196d8acSJiri Slaby if (up->capabilities & UART_CAP_UUE) 32519196d8acSJiri Slaby serial_port_out(port, UART_IER, UART_IER_UUE); 32529196d8acSJiri Slaby else 32539196d8acSJiri Slaby serial_port_out(port, UART_IER, 0); 32549196d8acSJiri Slaby 32554516d50aSPeter Hurley /* check scratch reg to see if port powered off during system sleep */ 32564516d50aSPeter Hurley if (up->canary && (up->canary != serial_port_in(port, UART_SCR))) { 32574516d50aSPeter Hurley struct ktermios termios; 32584516d50aSPeter Hurley unsigned int baud, quot, frac = 0; 32594516d50aSPeter Hurley 32604516d50aSPeter Hurley termios.c_cflag = port->cons->cflag; 32614516d50aSPeter Hurley if (port->state->port.tty && termios.c_cflag == 0) 32624516d50aSPeter Hurley termios.c_cflag = port->state->port.tty->termios.c_cflag; 32634516d50aSPeter Hurley 32644516d50aSPeter Hurley baud = uart_get_baud_rate(port, &termios, NULL, 32654516d50aSPeter Hurley port->uartclk / 16 / 0xffff, 32664516d50aSPeter Hurley port->uartclk / 16); 32674516d50aSPeter Hurley quot = serial8250_get_divisor(up, baud, &frac); 32684516d50aSPeter Hurley 32694516d50aSPeter Hurley serial8250_set_divisor(port, baud, quot, frac); 32704516d50aSPeter Hurley serial_port_out(port, UART_LCR, up->lcr); 32714516d50aSPeter Hurley serial_port_out(port, UART_MCR, UART_MCR_DTR | UART_MCR_RTS); 32724516d50aSPeter Hurley 32734516d50aSPeter Hurley up->canary = 0; 32744516d50aSPeter Hurley } 32754516d50aSPeter Hurley 32769196d8acSJiri Slaby uart_console_write(port, s, count, serial8250_console_putchar); 32779196d8acSJiri Slaby 32789196d8acSJiri Slaby /* 32799196d8acSJiri Slaby * Finally, wait for transmitter to become empty 32809196d8acSJiri Slaby * and restore the IER 32819196d8acSJiri Slaby */ 32829196d8acSJiri Slaby wait_for_xmitr(up, BOTH_EMPTY); 32839196d8acSJiri Slaby serial_port_out(port, UART_IER, ier); 32849196d8acSJiri Slaby 32859196d8acSJiri Slaby /* 32869196d8acSJiri Slaby * The receive handling will happen properly because the 32879196d8acSJiri Slaby * receive ready bit will still be set; it is not cleared 32889196d8acSJiri Slaby * on read. However, modem control will not, we must 32899196d8acSJiri Slaby * call it if we have saved something in the saved flags 32909196d8acSJiri Slaby * while processing with interrupts off. 32919196d8acSJiri Slaby */ 32929196d8acSJiri Slaby if (up->msr_saved_flags) 32939196d8acSJiri Slaby serial8250_modem_status(up); 32949196d8acSJiri Slaby 32959196d8acSJiri Slaby if (locked) 3296ebade5e8SIngo Molnar spin_unlock_irqrestore(&port->lock, flags); 3297d74d5d1bSSebastian Andrzej Siewior serial8250_rpm_put(up); 32989196d8acSJiri Slaby } 32999196d8acSJiri Slaby 3300f31b5d27SSebastian Andrzej Siewior static int serial8250_console_setup(struct console *co, char *options) 33019196d8acSJiri Slaby { 33029196d8acSJiri Slaby struct uart_port *port; 33039196d8acSJiri Slaby int baud = 9600; 33049196d8acSJiri Slaby int bits = 8; 33059196d8acSJiri Slaby int parity = 'n'; 33069196d8acSJiri Slaby int flow = 'n'; 33079196d8acSJiri Slaby 33089196d8acSJiri Slaby /* 33099196d8acSJiri Slaby * Check whether an invalid uart number has been specified, and 33109196d8acSJiri Slaby * if so, search for the first available port that does have 33119196d8acSJiri Slaby * console support. 33129196d8acSJiri Slaby */ 3313317a6842SKyle McMartin if (co->index >= nr_uarts) 33149196d8acSJiri Slaby co->index = 0; 33159196d8acSJiri Slaby port = &serial8250_ports[co->index].port; 33169196d8acSJiri Slaby if (!port->iobase && !port->membase) 33179196d8acSJiri Slaby return -ENODEV; 33189196d8acSJiri Slaby 33199196d8acSJiri Slaby if (options) 33209196d8acSJiri Slaby uart_parse_options(options, &baud, &parity, &bits, &flow); 33219196d8acSJiri Slaby 33229196d8acSJiri Slaby return uart_set_options(port, co, baud, parity, bits, flow); 33239196d8acSJiri Slaby } 33249196d8acSJiri Slaby 33259196d8acSJiri Slaby static int serial8250_console_early_setup(void) 33269196d8acSJiri Slaby { 33279196d8acSJiri Slaby return serial8250_find_port_for_earlycon(); 33289196d8acSJiri Slaby } 33299196d8acSJiri Slaby 33309196d8acSJiri Slaby static struct console serial8250_console = { 33319196d8acSJiri Slaby .name = "ttyS", 33329196d8acSJiri Slaby .write = serial8250_console_write, 33339196d8acSJiri Slaby .device = uart_console_device, 33349196d8acSJiri Slaby .setup = serial8250_console_setup, 33359196d8acSJiri Slaby .early_setup = serial8250_console_early_setup, 33369196d8acSJiri Slaby .flags = CON_PRINTBUFFER | CON_ANYTIME, 33379196d8acSJiri Slaby .index = -1, 33389196d8acSJiri Slaby .data = &serial8250_reg, 33399196d8acSJiri Slaby }; 33409196d8acSJiri Slaby 33419196d8acSJiri Slaby static int __init serial8250_console_init(void) 33429196d8acSJiri Slaby { 33439196d8acSJiri Slaby serial8250_isa_init_ports(); 33449196d8acSJiri Slaby register_console(&serial8250_console); 33459196d8acSJiri Slaby return 0; 33469196d8acSJiri Slaby } 33479196d8acSJiri Slaby console_initcall(serial8250_console_init); 33489196d8acSJiri Slaby 33499196d8acSJiri Slaby int serial8250_find_port(struct uart_port *p) 33509196d8acSJiri Slaby { 33519196d8acSJiri Slaby int line; 33529196d8acSJiri Slaby struct uart_port *port; 33539196d8acSJiri Slaby 3354317a6842SKyle McMartin for (line = 0; line < nr_uarts; line++) { 33559196d8acSJiri Slaby port = &serial8250_ports[line].port; 33569196d8acSJiri Slaby if (uart_match_port(p, port)) 33579196d8acSJiri Slaby return line; 33589196d8acSJiri Slaby } 33599196d8acSJiri Slaby return -ENODEV; 33609196d8acSJiri Slaby } 33619196d8acSJiri Slaby 33629196d8acSJiri Slaby #define SERIAL8250_CONSOLE &serial8250_console 33639196d8acSJiri Slaby #else 33649196d8acSJiri Slaby #define SERIAL8250_CONSOLE NULL 33659196d8acSJiri Slaby #endif 33669196d8acSJiri Slaby 33679196d8acSJiri Slaby static struct uart_driver serial8250_reg = { 33689196d8acSJiri Slaby .owner = THIS_MODULE, 33699196d8acSJiri Slaby .driver_name = "serial", 33709196d8acSJiri Slaby .dev_name = "ttyS", 33719196d8acSJiri Slaby .major = TTY_MAJOR, 33729196d8acSJiri Slaby .minor = 64, 33739196d8acSJiri Slaby .cons = SERIAL8250_CONSOLE, 33749196d8acSJiri Slaby }; 33759196d8acSJiri Slaby 33769196d8acSJiri Slaby /* 33779196d8acSJiri Slaby * early_serial_setup - early registration for 8250 ports 33789196d8acSJiri Slaby * 33799196d8acSJiri Slaby * Setup an 8250 port structure prior to console initialisation. Use 33809196d8acSJiri Slaby * after console initialisation will cause undefined behaviour. 33819196d8acSJiri Slaby */ 33829196d8acSJiri Slaby int __init early_serial_setup(struct uart_port *port) 33839196d8acSJiri Slaby { 33849196d8acSJiri Slaby struct uart_port *p; 33859196d8acSJiri Slaby 33869196d8acSJiri Slaby if (port->line >= ARRAY_SIZE(serial8250_ports)) 33879196d8acSJiri Slaby return -ENODEV; 33889196d8acSJiri Slaby 33899196d8acSJiri Slaby serial8250_isa_init_ports(); 33909196d8acSJiri Slaby p = &serial8250_ports[port->line].port; 33919196d8acSJiri Slaby p->iobase = port->iobase; 33929196d8acSJiri Slaby p->membase = port->membase; 33939196d8acSJiri Slaby p->irq = port->irq; 33949196d8acSJiri Slaby p->irqflags = port->irqflags; 33959196d8acSJiri Slaby p->uartclk = port->uartclk; 33969196d8acSJiri Slaby p->fifosize = port->fifosize; 33979196d8acSJiri Slaby p->regshift = port->regshift; 33989196d8acSJiri Slaby p->iotype = port->iotype; 33999196d8acSJiri Slaby p->flags = port->flags; 34009196d8acSJiri Slaby p->mapbase = port->mapbase; 34019196d8acSJiri Slaby p->private_data = port->private_data; 34029196d8acSJiri Slaby p->type = port->type; 34039196d8acSJiri Slaby p->line = port->line; 34049196d8acSJiri Slaby 34059196d8acSJiri Slaby set_io_from_upio(p); 34069196d8acSJiri Slaby if (port->serial_in) 34079196d8acSJiri Slaby p->serial_in = port->serial_in; 34089196d8acSJiri Slaby if (port->serial_out) 34099196d8acSJiri Slaby p->serial_out = port->serial_out; 34109196d8acSJiri Slaby if (port->handle_irq) 34119196d8acSJiri Slaby p->handle_irq = port->handle_irq; 34129196d8acSJiri Slaby 34139196d8acSJiri Slaby return 0; 34149196d8acSJiri Slaby } 34159196d8acSJiri Slaby 34169196d8acSJiri Slaby /** 34179196d8acSJiri Slaby * serial8250_suspend_port - suspend one serial port 34189196d8acSJiri Slaby * @line: serial line number 34199196d8acSJiri Slaby * 34209196d8acSJiri Slaby * Suspend one serial port. 34219196d8acSJiri Slaby */ 34229196d8acSJiri Slaby void serial8250_suspend_port(int line) 34239196d8acSJiri Slaby { 34244516d50aSPeter Hurley struct uart_8250_port *up = &serial8250_ports[line]; 34254516d50aSPeter Hurley struct uart_port *port = &up->port; 34264516d50aSPeter Hurley 34274516d50aSPeter Hurley if (!console_suspend_enabled && uart_console(port) && 34284516d50aSPeter Hurley port->type != PORT_8250) { 34294516d50aSPeter Hurley unsigned char canary = 0xa5; 34304516d50aSPeter Hurley serial_out(up, UART_SCR, canary); 34314516d50aSPeter Hurley up->canary = canary; 34324516d50aSPeter Hurley } 34334516d50aSPeter Hurley 34344516d50aSPeter Hurley uart_suspend_port(&serial8250_reg, port); 34359196d8acSJiri Slaby } 34369196d8acSJiri Slaby 34379196d8acSJiri Slaby /** 34389196d8acSJiri Slaby * serial8250_resume_port - resume one serial port 34399196d8acSJiri Slaby * @line: serial line number 34409196d8acSJiri Slaby * 34419196d8acSJiri Slaby * Resume one serial port. 34429196d8acSJiri Slaby */ 34439196d8acSJiri Slaby void serial8250_resume_port(int line) 34449196d8acSJiri Slaby { 34459196d8acSJiri Slaby struct uart_8250_port *up = &serial8250_ports[line]; 34469196d8acSJiri Slaby struct uart_port *port = &up->port; 34479196d8acSJiri Slaby 34484516d50aSPeter Hurley up->canary = 0; 34494516d50aSPeter Hurley 34509196d8acSJiri Slaby if (up->capabilities & UART_NATSEMI) { 34519196d8acSJiri Slaby /* Ensure it's still in high speed mode */ 34529196d8acSJiri Slaby serial_port_out(port, UART_LCR, 0xE0); 34539196d8acSJiri Slaby 34549196d8acSJiri Slaby ns16550a_goto_highspeed(up); 34559196d8acSJiri Slaby 34569196d8acSJiri Slaby serial_port_out(port, UART_LCR, 0); 34579196d8acSJiri Slaby port->uartclk = 921600*16; 34589196d8acSJiri Slaby } 34599196d8acSJiri Slaby uart_resume_port(&serial8250_reg, port); 34609196d8acSJiri Slaby } 34619196d8acSJiri Slaby 34629196d8acSJiri Slaby /* 34639196d8acSJiri Slaby * Register a set of serial devices attached to a platform device. The 34649196d8acSJiri Slaby * list is terminated with a zero flags entry, which means we expect 34659196d8acSJiri Slaby * all entries to have at least UPF_BOOT_AUTOCONF set. 34669196d8acSJiri Slaby */ 34679196d8acSJiri Slaby static int serial8250_probe(struct platform_device *dev) 34689196d8acSJiri Slaby { 3469574de559SJingoo Han struct plat_serial8250_port *p = dev_get_platdata(&dev->dev); 34709196d8acSJiri Slaby struct uart_8250_port uart; 34719196d8acSJiri Slaby int ret, i, irqflag = 0; 34729196d8acSJiri Slaby 34739196d8acSJiri Slaby memset(&uart, 0, sizeof(uart)); 34749196d8acSJiri Slaby 34759196d8acSJiri Slaby if (share_irqs) 34769196d8acSJiri Slaby irqflag = IRQF_SHARED; 34779196d8acSJiri Slaby 34789196d8acSJiri Slaby for (i = 0; p && p->flags != 0; p++, i++) { 34799196d8acSJiri Slaby uart.port.iobase = p->iobase; 34809196d8acSJiri Slaby uart.port.membase = p->membase; 34819196d8acSJiri Slaby uart.port.irq = p->irq; 34829196d8acSJiri Slaby uart.port.irqflags = p->irqflags; 34839196d8acSJiri Slaby uart.port.uartclk = p->uartclk; 34849196d8acSJiri Slaby uart.port.regshift = p->regshift; 34859196d8acSJiri Slaby uart.port.iotype = p->iotype; 34869196d8acSJiri Slaby uart.port.flags = p->flags; 34879196d8acSJiri Slaby uart.port.mapbase = p->mapbase; 34889196d8acSJiri Slaby uart.port.hub6 = p->hub6; 34899196d8acSJiri Slaby uart.port.private_data = p->private_data; 34909196d8acSJiri Slaby uart.port.type = p->type; 34919196d8acSJiri Slaby uart.port.serial_in = p->serial_in; 34929196d8acSJiri Slaby uart.port.serial_out = p->serial_out; 34939196d8acSJiri Slaby uart.port.handle_irq = p->handle_irq; 34949196d8acSJiri Slaby uart.port.handle_break = p->handle_break; 34959196d8acSJiri Slaby uart.port.set_termios = p->set_termios; 34969196d8acSJiri Slaby uart.port.pm = p->pm; 34979196d8acSJiri Slaby uart.port.dev = &dev->dev; 34989196d8acSJiri Slaby uart.port.irqflags |= irqflag; 34999196d8acSJiri Slaby ret = serial8250_register_8250_port(&uart); 35009196d8acSJiri Slaby if (ret < 0) { 35019196d8acSJiri Slaby dev_err(&dev->dev, "unable to register port at index %d " 35029196d8acSJiri Slaby "(IO%lx MEM%llx IRQ%d): %d\n", i, 35039196d8acSJiri Slaby p->iobase, (unsigned long long)p->mapbase, 35049196d8acSJiri Slaby p->irq, ret); 35059196d8acSJiri Slaby } 35069196d8acSJiri Slaby } 35079196d8acSJiri Slaby return 0; 35089196d8acSJiri Slaby } 35099196d8acSJiri Slaby 35109196d8acSJiri Slaby /* 35119196d8acSJiri Slaby * Remove serial ports registered against a platform device. 35129196d8acSJiri Slaby */ 35139196d8acSJiri Slaby static int serial8250_remove(struct platform_device *dev) 35149196d8acSJiri Slaby { 35159196d8acSJiri Slaby int i; 35169196d8acSJiri Slaby 3517317a6842SKyle McMartin for (i = 0; i < nr_uarts; i++) { 35189196d8acSJiri Slaby struct uart_8250_port *up = &serial8250_ports[i]; 35199196d8acSJiri Slaby 35209196d8acSJiri Slaby if (up->port.dev == &dev->dev) 35219196d8acSJiri Slaby serial8250_unregister_port(i); 35229196d8acSJiri Slaby } 35239196d8acSJiri Slaby return 0; 35249196d8acSJiri Slaby } 35259196d8acSJiri Slaby 35269196d8acSJiri Slaby static int serial8250_suspend(struct platform_device *dev, pm_message_t state) 35279196d8acSJiri Slaby { 35289196d8acSJiri Slaby int i; 35299196d8acSJiri Slaby 35309196d8acSJiri Slaby for (i = 0; i < UART_NR; i++) { 35319196d8acSJiri Slaby struct uart_8250_port *up = &serial8250_ports[i]; 35329196d8acSJiri Slaby 35339196d8acSJiri Slaby if (up->port.type != PORT_UNKNOWN && up->port.dev == &dev->dev) 35349196d8acSJiri Slaby uart_suspend_port(&serial8250_reg, &up->port); 35359196d8acSJiri Slaby } 35369196d8acSJiri Slaby 35379196d8acSJiri Slaby return 0; 35389196d8acSJiri Slaby } 35399196d8acSJiri Slaby 35409196d8acSJiri Slaby static int serial8250_resume(struct platform_device *dev) 35419196d8acSJiri Slaby { 35429196d8acSJiri Slaby int i; 35439196d8acSJiri Slaby 35449196d8acSJiri Slaby for (i = 0; i < UART_NR; i++) { 35459196d8acSJiri Slaby struct uart_8250_port *up = &serial8250_ports[i]; 35469196d8acSJiri Slaby 35479196d8acSJiri Slaby if (up->port.type != PORT_UNKNOWN && up->port.dev == &dev->dev) 35489196d8acSJiri Slaby serial8250_resume_port(i); 35499196d8acSJiri Slaby } 35509196d8acSJiri Slaby 35519196d8acSJiri Slaby return 0; 35529196d8acSJiri Slaby } 35539196d8acSJiri Slaby 35549196d8acSJiri Slaby static struct platform_driver serial8250_isa_driver = { 35559196d8acSJiri Slaby .probe = serial8250_probe, 35569196d8acSJiri Slaby .remove = serial8250_remove, 35579196d8acSJiri Slaby .suspend = serial8250_suspend, 35589196d8acSJiri Slaby .resume = serial8250_resume, 35599196d8acSJiri Slaby .driver = { 35609196d8acSJiri Slaby .name = "serial8250", 35619196d8acSJiri Slaby }, 35629196d8acSJiri Slaby }; 35639196d8acSJiri Slaby 35649196d8acSJiri Slaby /* 35659196d8acSJiri Slaby * This "device" covers _all_ ISA 8250-compatible serial devices listed 35669196d8acSJiri Slaby * in the table in include/asm/serial.h 35679196d8acSJiri Slaby */ 35689196d8acSJiri Slaby static struct platform_device *serial8250_isa_devs; 35699196d8acSJiri Slaby 35709196d8acSJiri Slaby /* 35719196d8acSJiri Slaby * serial8250_register_8250_port and serial8250_unregister_port allows for 35729196d8acSJiri Slaby * 16x50 serial ports to be configured at run-time, to support PCMCIA 35739196d8acSJiri Slaby * modems and PCI multiport cards. 35749196d8acSJiri Slaby */ 35759196d8acSJiri Slaby static DEFINE_MUTEX(serial_mutex); 35769196d8acSJiri Slaby 35779196d8acSJiri Slaby static struct uart_8250_port *serial8250_find_match_or_unused(struct uart_port *port) 35789196d8acSJiri Slaby { 35799196d8acSJiri Slaby int i; 35809196d8acSJiri Slaby 35819196d8acSJiri Slaby /* 35829196d8acSJiri Slaby * First, find a port entry which matches. 35839196d8acSJiri Slaby */ 3584317a6842SKyle McMartin for (i = 0; i < nr_uarts; i++) 35859196d8acSJiri Slaby if (uart_match_port(&serial8250_ports[i].port, port)) 35869196d8acSJiri Slaby return &serial8250_ports[i]; 35879196d8acSJiri Slaby 358859b3e898SSebastian Andrzej Siewior /* try line number first if still available */ 358959b3e898SSebastian Andrzej Siewior i = port->line; 359059b3e898SSebastian Andrzej Siewior if (i < nr_uarts && serial8250_ports[i].port.type == PORT_UNKNOWN && 359159b3e898SSebastian Andrzej Siewior serial8250_ports[i].port.iobase == 0) 359259b3e898SSebastian Andrzej Siewior return &serial8250_ports[i]; 35939196d8acSJiri Slaby /* 35949196d8acSJiri Slaby * We didn't find a matching entry, so look for the first 35959196d8acSJiri Slaby * free entry. We look for one which hasn't been previously 35969196d8acSJiri Slaby * used (indicated by zero iobase). 35979196d8acSJiri Slaby */ 3598317a6842SKyle McMartin for (i = 0; i < nr_uarts; i++) 35999196d8acSJiri Slaby if (serial8250_ports[i].port.type == PORT_UNKNOWN && 36009196d8acSJiri Slaby serial8250_ports[i].port.iobase == 0) 36019196d8acSJiri Slaby return &serial8250_ports[i]; 36029196d8acSJiri Slaby 36039196d8acSJiri Slaby /* 36049196d8acSJiri Slaby * That also failed. Last resort is to find any entry which 36059196d8acSJiri Slaby * doesn't have a real port associated with it. 36069196d8acSJiri Slaby */ 3607317a6842SKyle McMartin for (i = 0; i < nr_uarts; i++) 36089196d8acSJiri Slaby if (serial8250_ports[i].port.type == PORT_UNKNOWN) 36099196d8acSJiri Slaby return &serial8250_ports[i]; 36109196d8acSJiri Slaby 36119196d8acSJiri Slaby return NULL; 36129196d8acSJiri Slaby } 36139196d8acSJiri Slaby 36149196d8acSJiri Slaby /** 36159196d8acSJiri Slaby * serial8250_register_8250_port - register a serial port 36169196d8acSJiri Slaby * @up: serial port template 36179196d8acSJiri Slaby * 36189196d8acSJiri Slaby * Configure the serial port specified by the request. If the 36199196d8acSJiri Slaby * port exists and is in use, it is hung up and unregistered 36209196d8acSJiri Slaby * first. 36219196d8acSJiri Slaby * 36229196d8acSJiri Slaby * The port is then probed and if necessary the IRQ is autodetected 36239196d8acSJiri Slaby * If this fails an error is returned. 36249196d8acSJiri Slaby * 36259196d8acSJiri Slaby * On success the port is ready to use and the line number is returned. 36269196d8acSJiri Slaby */ 36279196d8acSJiri Slaby int serial8250_register_8250_port(struct uart_8250_port *up) 36289196d8acSJiri Slaby { 36299196d8acSJiri Slaby struct uart_8250_port *uart; 36309196d8acSJiri Slaby int ret = -ENOSPC; 36319196d8acSJiri Slaby 36329196d8acSJiri Slaby if (up->port.uartclk == 0) 36339196d8acSJiri Slaby return -EINVAL; 36349196d8acSJiri Slaby 36359196d8acSJiri Slaby mutex_lock(&serial_mutex); 36369196d8acSJiri Slaby 36379196d8acSJiri Slaby uart = serial8250_find_match_or_unused(&up->port); 36389196d8acSJiri Slaby if (uart && uart->port.type != PORT_8250_CIR) { 36399196d8acSJiri Slaby if (uart->port.dev) 36409196d8acSJiri Slaby uart_remove_one_port(&serial8250_reg, &uart->port); 36419196d8acSJiri Slaby 36429196d8acSJiri Slaby uart->port.iobase = up->port.iobase; 36439196d8acSJiri Slaby uart->port.membase = up->port.membase; 36449196d8acSJiri Slaby uart->port.irq = up->port.irq; 36459196d8acSJiri Slaby uart->port.irqflags = up->port.irqflags; 36469196d8acSJiri Slaby uart->port.uartclk = up->port.uartclk; 36479196d8acSJiri Slaby uart->port.fifosize = up->port.fifosize; 36489196d8acSJiri Slaby uart->port.regshift = up->port.regshift; 36499196d8acSJiri Slaby uart->port.iotype = up->port.iotype; 36509196d8acSJiri Slaby uart->port.flags = up->port.flags | UPF_BOOT_AUTOCONF; 36519196d8acSJiri Slaby uart->bugs = up->bugs; 36529196d8acSJiri Slaby uart->port.mapbase = up->port.mapbase; 36539196d8acSJiri Slaby uart->port.private_data = up->port.private_data; 36549196d8acSJiri Slaby uart->port.fifosize = up->port.fifosize; 36559196d8acSJiri Slaby uart->tx_loadsz = up->tx_loadsz; 36569196d8acSJiri Slaby uart->capabilities = up->capabilities; 3657234abab1SSebastian Andrzej Siewior uart->port.throttle = up->port.throttle; 3658234abab1SSebastian Andrzej Siewior uart->port.unthrottle = up->port.unthrottle; 365946c55b4bSRicardo Ribalda Delgado uart->port.rs485_config = up->port.rs485_config; 366046c55b4bSRicardo Ribalda Delgado uart->port.rs485 = up->port.rs485; 36619196d8acSJiri Slaby 3662ef99f3aeSGreg Kroah-Hartman /* Take tx_loadsz from fifosize if it wasn't set separately */ 3663ef99f3aeSGreg Kroah-Hartman if (uart->port.fifosize && !uart->tx_loadsz) 3664ef99f3aeSGreg Kroah-Hartman uart->tx_loadsz = uart->port.fifosize; 3665ef99f3aeSGreg Kroah-Hartman 36669196d8acSJiri Slaby if (up->port.dev) 36679196d8acSJiri Slaby uart->port.dev = up->port.dev; 36689196d8acSJiri Slaby 3669e13cb72bSPeter Hurley if (skip_txen_test) 3670e13cb72bSPeter Hurley uart->port.flags |= UPF_NO_TXEN_TEST; 3671e13cb72bSPeter Hurley 36729196d8acSJiri Slaby if (up->port.flags & UPF_FIXED_TYPE) 36739196d8acSJiri Slaby serial8250_init_fixed_type_port(uart, up->port.type); 36749196d8acSJiri Slaby 36759196d8acSJiri Slaby set_io_from_upio(&uart->port); 36769196d8acSJiri Slaby /* Possibly override default I/O functions. */ 36779196d8acSJiri Slaby if (up->port.serial_in) 36789196d8acSJiri Slaby uart->port.serial_in = up->port.serial_in; 36799196d8acSJiri Slaby if (up->port.serial_out) 36809196d8acSJiri Slaby uart->port.serial_out = up->port.serial_out; 36819196d8acSJiri Slaby if (up->port.handle_irq) 36829196d8acSJiri Slaby uart->port.handle_irq = up->port.handle_irq; 36839196d8acSJiri Slaby /* Possibly override set_termios call */ 36849196d8acSJiri Slaby if (up->port.set_termios) 36859196d8acSJiri Slaby uart->port.set_termios = up->port.set_termios; 36864bf4ea9dSPeter Hurley if (up->port.set_mctrl) 36874bf4ea9dSPeter Hurley uart->port.set_mctrl = up->port.set_mctrl; 3688b99b121bSSebastian Andrzej Siewior if (up->port.startup) 3689b99b121bSSebastian Andrzej Siewior uart->port.startup = up->port.startup; 3690b99b121bSSebastian Andrzej Siewior if (up->port.shutdown) 3691b99b121bSSebastian Andrzej Siewior uart->port.shutdown = up->port.shutdown; 36929196d8acSJiri Slaby if (up->port.pm) 36939196d8acSJiri Slaby uart->port.pm = up->port.pm; 36949196d8acSJiri Slaby if (up->port.handle_break) 36959196d8acSJiri Slaby uart->port.handle_break = up->port.handle_break; 36969196d8acSJiri Slaby if (up->dl_read) 36979196d8acSJiri Slaby uart->dl_read = up->dl_read; 36989196d8acSJiri Slaby if (up->dl_write) 36999196d8acSJiri Slaby uart->dl_write = up->dl_write; 3700f1a297bbSSebastian Andrzej Siewior if (up->dma) { 37019196d8acSJiri Slaby uart->dma = up->dma; 3702f1a297bbSSebastian Andrzej Siewior if (!uart->dma->tx_dma) 3703f1a297bbSSebastian Andrzej Siewior uart->dma->tx_dma = serial8250_tx_dma; 3704f1a297bbSSebastian Andrzej Siewior if (!uart->dma->rx_dma) 3705f1a297bbSSebastian Andrzej Siewior uart->dma->rx_dma = serial8250_rx_dma; 3706f1a297bbSSebastian Andrzej Siewior } 37079196d8acSJiri Slaby 37089196d8acSJiri Slaby if (serial8250_isa_config != NULL) 37099196d8acSJiri Slaby serial8250_isa_config(0, &uart->port, 37109196d8acSJiri Slaby &uart->capabilities); 37119196d8acSJiri Slaby 37129196d8acSJiri Slaby ret = uart_add_one_port(&serial8250_reg, &uart->port); 37139196d8acSJiri Slaby if (ret == 0) 37149196d8acSJiri Slaby ret = uart->port.line; 37159196d8acSJiri Slaby } 37169196d8acSJiri Slaby mutex_unlock(&serial_mutex); 37179196d8acSJiri Slaby 37189196d8acSJiri Slaby return ret; 37199196d8acSJiri Slaby } 37209196d8acSJiri Slaby EXPORT_SYMBOL(serial8250_register_8250_port); 37219196d8acSJiri Slaby 37229196d8acSJiri Slaby /** 37239196d8acSJiri Slaby * serial8250_unregister_port - remove a 16x50 serial port at runtime 37249196d8acSJiri Slaby * @line: serial line number 37259196d8acSJiri Slaby * 37269196d8acSJiri Slaby * Remove one serial port. This may not be called from interrupt 37279196d8acSJiri Slaby * context. We hand the port back to the our control. 37289196d8acSJiri Slaby */ 37299196d8acSJiri Slaby void serial8250_unregister_port(int line) 37309196d8acSJiri Slaby { 37319196d8acSJiri Slaby struct uart_8250_port *uart = &serial8250_ports[line]; 37329196d8acSJiri Slaby 37339196d8acSJiri Slaby mutex_lock(&serial_mutex); 37349196d8acSJiri Slaby uart_remove_one_port(&serial8250_reg, &uart->port); 37359196d8acSJiri Slaby if (serial8250_isa_devs) { 37369196d8acSJiri Slaby uart->port.flags &= ~UPF_BOOT_AUTOCONF; 3737e13cb72bSPeter Hurley if (skip_txen_test) 3738e13cb72bSPeter Hurley uart->port.flags |= UPF_NO_TXEN_TEST; 37399196d8acSJiri Slaby uart->port.type = PORT_UNKNOWN; 37409196d8acSJiri Slaby uart->port.dev = &serial8250_isa_devs->dev; 37415db496b9SPeter Hurley uart->capabilities = 0; 37429196d8acSJiri Slaby uart_add_one_port(&serial8250_reg, &uart->port); 37439196d8acSJiri Slaby } else { 37449196d8acSJiri Slaby uart->port.dev = NULL; 37459196d8acSJiri Slaby } 37469196d8acSJiri Slaby mutex_unlock(&serial_mutex); 37479196d8acSJiri Slaby } 37489196d8acSJiri Slaby EXPORT_SYMBOL(serial8250_unregister_port); 37499196d8acSJiri Slaby 37509196d8acSJiri Slaby static int __init serial8250_init(void) 37519196d8acSJiri Slaby { 37529196d8acSJiri Slaby int ret; 37539196d8acSJiri Slaby 37549196d8acSJiri Slaby serial8250_isa_init_ports(); 37559196d8acSJiri Slaby 37569196d8acSJiri Slaby printk(KERN_INFO "Serial: 8250/16550 driver, " 37579196d8acSJiri Slaby "%d ports, IRQ sharing %sabled\n", nr_uarts, 37589196d8acSJiri Slaby share_irqs ? "en" : "dis"); 37599196d8acSJiri Slaby 37609196d8acSJiri Slaby #ifdef CONFIG_SPARC 37619196d8acSJiri Slaby ret = sunserial_register_minors(&serial8250_reg, UART_NR); 37629196d8acSJiri Slaby #else 37639196d8acSJiri Slaby serial8250_reg.nr = UART_NR; 37649196d8acSJiri Slaby ret = uart_register_driver(&serial8250_reg); 37659196d8acSJiri Slaby #endif 37669196d8acSJiri Slaby if (ret) 37679196d8acSJiri Slaby goto out; 37689196d8acSJiri Slaby 37699196d8acSJiri Slaby ret = serial8250_pnp_init(); 37709196d8acSJiri Slaby if (ret) 37719196d8acSJiri Slaby goto unreg_uart_drv; 37729196d8acSJiri Slaby 37739196d8acSJiri Slaby serial8250_isa_devs = platform_device_alloc("serial8250", 37749196d8acSJiri Slaby PLAT8250_DEV_LEGACY); 37759196d8acSJiri Slaby if (!serial8250_isa_devs) { 37769196d8acSJiri Slaby ret = -ENOMEM; 37779196d8acSJiri Slaby goto unreg_pnp; 37789196d8acSJiri Slaby } 37799196d8acSJiri Slaby 37809196d8acSJiri Slaby ret = platform_device_add(serial8250_isa_devs); 37819196d8acSJiri Slaby if (ret) 37829196d8acSJiri Slaby goto put_dev; 37839196d8acSJiri Slaby 37849196d8acSJiri Slaby serial8250_register_ports(&serial8250_reg, &serial8250_isa_devs->dev); 37859196d8acSJiri Slaby 37869196d8acSJiri Slaby ret = platform_driver_register(&serial8250_isa_driver); 37879196d8acSJiri Slaby if (ret == 0) 37889196d8acSJiri Slaby goto out; 37899196d8acSJiri Slaby 37909196d8acSJiri Slaby platform_device_del(serial8250_isa_devs); 37919196d8acSJiri Slaby put_dev: 37929196d8acSJiri Slaby platform_device_put(serial8250_isa_devs); 37939196d8acSJiri Slaby unreg_pnp: 37949196d8acSJiri Slaby serial8250_pnp_exit(); 37959196d8acSJiri Slaby unreg_uart_drv: 37969196d8acSJiri Slaby #ifdef CONFIG_SPARC 37979196d8acSJiri Slaby sunserial_unregister_minors(&serial8250_reg, UART_NR); 37989196d8acSJiri Slaby #else 37999196d8acSJiri Slaby uart_unregister_driver(&serial8250_reg); 38009196d8acSJiri Slaby #endif 38019196d8acSJiri Slaby out: 38029196d8acSJiri Slaby return ret; 38039196d8acSJiri Slaby } 38049196d8acSJiri Slaby 38059196d8acSJiri Slaby static void __exit serial8250_exit(void) 38069196d8acSJiri Slaby { 38079196d8acSJiri Slaby struct platform_device *isa_dev = serial8250_isa_devs; 38089196d8acSJiri Slaby 38099196d8acSJiri Slaby /* 38109196d8acSJiri Slaby * This tells serial8250_unregister_port() not to re-register 38119196d8acSJiri Slaby * the ports (thereby making serial8250_isa_driver permanently 38129196d8acSJiri Slaby * in use.) 38139196d8acSJiri Slaby */ 38149196d8acSJiri Slaby serial8250_isa_devs = NULL; 38159196d8acSJiri Slaby 38169196d8acSJiri Slaby platform_driver_unregister(&serial8250_isa_driver); 38179196d8acSJiri Slaby platform_device_unregister(isa_dev); 38189196d8acSJiri Slaby 38199196d8acSJiri Slaby serial8250_pnp_exit(); 38209196d8acSJiri Slaby 38219196d8acSJiri Slaby #ifdef CONFIG_SPARC 38229196d8acSJiri Slaby sunserial_unregister_minors(&serial8250_reg, UART_NR); 38239196d8acSJiri Slaby #else 38249196d8acSJiri Slaby uart_unregister_driver(&serial8250_reg); 38259196d8acSJiri Slaby #endif 38269196d8acSJiri Slaby } 38279196d8acSJiri Slaby 38289196d8acSJiri Slaby module_init(serial8250_init); 38299196d8acSJiri Slaby module_exit(serial8250_exit); 38309196d8acSJiri Slaby 38319196d8acSJiri Slaby EXPORT_SYMBOL(serial8250_suspend_port); 38329196d8acSJiri Slaby EXPORT_SYMBOL(serial8250_resume_port); 38339196d8acSJiri Slaby 38349196d8acSJiri Slaby MODULE_LICENSE("GPL"); 38359196d8acSJiri Slaby MODULE_DESCRIPTION("Generic 8250/16x50 serial driver"); 38369196d8acSJiri Slaby 38379196d8acSJiri Slaby module_param(share_irqs, uint, 0644); 38389196d8acSJiri Slaby MODULE_PARM_DESC(share_irqs, "Share IRQs with other non-8250/16x50 devices" 38399196d8acSJiri Slaby " (unsafe)"); 38409196d8acSJiri Slaby 38419196d8acSJiri Slaby module_param(nr_uarts, uint, 0644); 38429196d8acSJiri Slaby MODULE_PARM_DESC(nr_uarts, "Maximum number of UARTs supported. (1-" __MODULE_STRING(CONFIG_SERIAL_8250_NR_UARTS) ")"); 38439196d8acSJiri Slaby 38449196d8acSJiri Slaby module_param(skip_txen_test, uint, 0644); 38459196d8acSJiri Slaby MODULE_PARM_DESC(skip_txen_test, "Skip checking for the TXEN bug at init time"); 38469196d8acSJiri Slaby 38479196d8acSJiri Slaby #ifdef CONFIG_SERIAL_8250_RSA 38489196d8acSJiri Slaby module_param_array(probe_rsa, ulong, &probe_rsa_count, 0444); 38499196d8acSJiri Slaby MODULE_PARM_DESC(probe_rsa, "Probe I/O ports for RSA"); 38509196d8acSJiri Slaby #endif 38519196d8acSJiri Slaby MODULE_ALIAS_CHARDEV_MAJOR(TTY_MAJOR); 38529196d8acSJiri Slaby 38539326b047SJiri Slaby #ifdef CONFIG_SERIAL_8250_DEPRECATED_OPTIONS 38549196d8acSJiri Slaby #ifndef MODULE 38559196d8acSJiri Slaby /* This module was renamed to 8250_core in 3.7. Keep the old "8250" name 38569196d8acSJiri Slaby * working as well for the module options so we don't break people. We 38579196d8acSJiri Slaby * need to keep the names identical and the convenient macros will happily 38589196d8acSJiri Slaby * refuse to let us do that by failing the build with redefinition errors 38599196d8acSJiri Slaby * of global variables. So we stick them inside a dummy function to avoid 38609196d8acSJiri Slaby * those conflicts. The options still get parsed, and the redefined 38619196d8acSJiri Slaby * MODULE_PARAM_PREFIX lets us keep the "8250." syntax alive. 38629196d8acSJiri Slaby * 38639196d8acSJiri Slaby * This is hacky. I'm sorry. 38649196d8acSJiri Slaby */ 38659196d8acSJiri Slaby static void __used s8250_options(void) 38669196d8acSJiri Slaby { 38679196d8acSJiri Slaby #undef MODULE_PARAM_PREFIX 38689196d8acSJiri Slaby #define MODULE_PARAM_PREFIX "8250_core." 38699196d8acSJiri Slaby 38709196d8acSJiri Slaby module_param_cb(share_irqs, ¶m_ops_uint, &share_irqs, 0644); 38719196d8acSJiri Slaby module_param_cb(nr_uarts, ¶m_ops_uint, &nr_uarts, 0644); 38729196d8acSJiri Slaby module_param_cb(skip_txen_test, ¶m_ops_uint, &skip_txen_test, 0644); 38739196d8acSJiri Slaby #ifdef CONFIG_SERIAL_8250_RSA 38749196d8acSJiri Slaby __module_param_call(MODULE_PARAM_PREFIX, probe_rsa, 38759196d8acSJiri Slaby ¶m_array_ops, .arr = &__param_arr_probe_rsa, 387691f9d330SJani Nikula 0444, -1, 0); 38779196d8acSJiri Slaby #endif 38789196d8acSJiri Slaby } 38799196d8acSJiri Slaby #else 38809196d8acSJiri Slaby MODULE_ALIAS("8250_core"); 38819196d8acSJiri Slaby #endif 38829326b047SJiri Slaby #endif 3883