1e3b3d0f5SGreg Kroah-Hartman // SPDX-License-Identifier: GPL-2.0+ 29196d8acSJiri Slaby /* 3b6830f6dSPeter Hurley * Universal/legacy driver for 8250/16550-type serial ports 49196d8acSJiri Slaby * 59196d8acSJiri Slaby * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o. 69196d8acSJiri Slaby * 79196d8acSJiri Slaby * Copyright (C) 2001 Russell King. 89196d8acSJiri Slaby * 9b6830f6dSPeter Hurley * Supports: ISA-compatible 8250/16550 ports 10b6830f6dSPeter Hurley * PNP 8250/16550 ports 11b6830f6dSPeter Hurley * early_serial_setup() ports 12b6830f6dSPeter Hurley * userspace-configurable "phantom" ports 13b6830f6dSPeter Hurley * "serial8250" platform devices 14b6830f6dSPeter Hurley * serial8250_register_8250_port() ports 159196d8acSJiri Slaby */ 169196d8acSJiri Slaby 174a96895fSYegor Yefremov #include <linux/acpi.h> 189196d8acSJiri Slaby #include <linux/module.h> 199196d8acSJiri Slaby #include <linux/moduleparam.h> 209196d8acSJiri Slaby #include <linux/ioport.h> 219196d8acSJiri Slaby #include <linux/init.h> 229196d8acSJiri Slaby #include <linux/console.h> 239196d8acSJiri Slaby #include <linux/sysrq.h> 249196d8acSJiri Slaby #include <linux/delay.h> 259196d8acSJiri Slaby #include <linux/platform_device.h> 26f9b11229SIlpo Järvinen #include <linux/pm_runtime.h> 279196d8acSJiri Slaby #include <linux/tty.h> 289196d8acSJiri Slaby #include <linux/ratelimit.h> 299196d8acSJiri Slaby #include <linux/tty_flip.h> 309196d8acSJiri Slaby #include <linux/serial.h> 319196d8acSJiri Slaby #include <linux/serial_8250.h> 329196d8acSJiri Slaby #include <linux/nmi.h> 339196d8acSJiri Slaby #include <linux/mutex.h> 349196d8acSJiri Slaby #include <linux/slab.h> 352cfc64f3SAndy Shevchenko #include <linux/string_helpers.h> 360b4af1d9SRicardo Ribalda Delgado #include <linux/uaccess.h> 372584cf83SDan Williams #include <linux/io.h> 389196d8acSJiri Slaby #ifdef CONFIG_SPARC 399196d8acSJiri Slaby #include <linux/sunserialcore.h> 409196d8acSJiri Slaby #endif 419196d8acSJiri Slaby 429196d8acSJiri Slaby #include <asm/irq.h> 439196d8acSJiri Slaby 449196d8acSJiri Slaby #include "8250.h" 459196d8acSJiri Slaby 469196d8acSJiri Slaby /* 479196d8acSJiri Slaby * Configuration: 489196d8acSJiri Slaby * share_irqs - whether we pass IRQF_SHARED to request_irq(). This option 499196d8acSJiri Slaby * is unsafe when used on edge-triggered interrupts. 509196d8acSJiri Slaby */ 519196d8acSJiri Slaby static unsigned int share_irqs = SERIAL8250_SHARE_IRQS; 529196d8acSJiri Slaby 539196d8acSJiri Slaby static unsigned int nr_uarts = CONFIG_SERIAL_8250_RUNTIME_UARTS; 549196d8acSJiri Slaby 559196d8acSJiri Slaby static struct uart_driver serial8250_reg; 569196d8acSJiri Slaby 579196d8acSJiri Slaby static unsigned int skip_txen_test; /* force skip of txen test at init time */ 589196d8acSJiri Slaby 599196d8acSJiri Slaby #define PASS_LIMIT 512 609196d8acSJiri Slaby 619196d8acSJiri Slaby #include <asm/serial.h> 629196d8acSJiri Slaby /* 639196d8acSJiri Slaby * SERIAL_PORT_DFNS tells us about built-in ports that have no 649196d8acSJiri Slaby * standard enumeration mechanism. Platforms that can find all 659196d8acSJiri Slaby * serial ports via mechanisms like ACPI or PCI need not supply it. 669196d8acSJiri Slaby */ 679196d8acSJiri Slaby #ifndef SERIAL_PORT_DFNS 689196d8acSJiri Slaby #define SERIAL_PORT_DFNS 699196d8acSJiri Slaby #endif 709196d8acSJiri Slaby 719196d8acSJiri Slaby static const struct old_serial_port old_serial_port[] = { 729196d8acSJiri Slaby SERIAL_PORT_DFNS /* defined in asm/serial.h */ 739196d8acSJiri Slaby }; 749196d8acSJiri Slaby 759196d8acSJiri Slaby #define UART_NR CONFIG_SERIAL_8250_NR_UARTS 769196d8acSJiri Slaby 779196d8acSJiri Slaby #ifdef CONFIG_SERIAL_8250_RSA 789196d8acSJiri Slaby 799196d8acSJiri Slaby #define PORT_RSA_MAX 4 809196d8acSJiri Slaby static unsigned long probe_rsa[PORT_RSA_MAX]; 819196d8acSJiri Slaby static unsigned int probe_rsa_count; 829196d8acSJiri Slaby #endif /* CONFIG_SERIAL_8250_RSA */ 839196d8acSJiri Slaby 849196d8acSJiri Slaby struct irq_info { 859196d8acSJiri Slaby struct hlist_node node; 869196d8acSJiri Slaby int irq; 879196d8acSJiri Slaby spinlock_t lock; /* Protects list not the hash */ 889196d8acSJiri Slaby struct list_head *head; 899196d8acSJiri Slaby }; 909196d8acSJiri Slaby 919196d8acSJiri Slaby #define NR_IRQ_HASH 32 /* Can be adjusted later */ 929196d8acSJiri Slaby static struct hlist_head irq_lists[NR_IRQ_HASH]; 939196d8acSJiri Slaby static DEFINE_MUTEX(hash_mutex); /* Used to walk the hash */ 949196d8acSJiri Slaby 959196d8acSJiri Slaby /* 969196d8acSJiri Slaby * This is the serial driver's interrupt routine. 979196d8acSJiri Slaby * 989196d8acSJiri Slaby * Arjan thinks the old way was overly complex, so it got simplified. 999196d8acSJiri Slaby * Alan disagrees, saying that need the complexity to handle the weird 1009196d8acSJiri Slaby * nature of ISA shared interrupts. (This is a special exception.) 1019196d8acSJiri Slaby * 1029196d8acSJiri Slaby * In order to handle ISA shared interrupts properly, we need to check 1039196d8acSJiri Slaby * that all ports have been serviced, and therefore the ISA interrupt 1049196d8acSJiri Slaby * line has been de-asserted. 1059196d8acSJiri Slaby * 1069196d8acSJiri Slaby * This means we need to loop through all ports. checking that they 1079196d8acSJiri Slaby * don't have an interrupt pending. 1089196d8acSJiri Slaby */ 1099196d8acSJiri Slaby static irqreturn_t serial8250_interrupt(int irq, void *dev_id) 1109196d8acSJiri Slaby { 1119196d8acSJiri Slaby struct irq_info *i = dev_id; 1129196d8acSJiri Slaby struct list_head *l, *end = NULL; 1139196d8acSJiri Slaby int pass_counter = 0, handled = 0; 1149196d8acSJiri Slaby 115934014d5SJiri Slaby pr_debug("%s(%d): start\n", __func__, irq); 1169196d8acSJiri Slaby 1179196d8acSJiri Slaby spin_lock(&i->lock); 1189196d8acSJiri Slaby 1199196d8acSJiri Slaby l = i->head; 1209196d8acSJiri Slaby do { 1219196d8acSJiri Slaby struct uart_8250_port *up; 1229196d8acSJiri Slaby struct uart_port *port; 1239196d8acSJiri Slaby 1249196d8acSJiri Slaby up = list_entry(l, struct uart_8250_port, list); 1259196d8acSJiri Slaby port = &up->port; 1269196d8acSJiri Slaby 1279196d8acSJiri Slaby if (port->handle_irq(port)) { 1289196d8acSJiri Slaby handled = 1; 1299196d8acSJiri Slaby end = NULL; 1309196d8acSJiri Slaby } else if (end == NULL) 1319196d8acSJiri Slaby end = l; 1329196d8acSJiri Slaby 1339196d8acSJiri Slaby l = l->next; 1349196d8acSJiri Slaby 1359d7c249aSSebastian Andrzej Siewior if (l == i->head && pass_counter++ > PASS_LIMIT) 1369196d8acSJiri Slaby break; 1379196d8acSJiri Slaby } while (l != end); 1389196d8acSJiri Slaby 1399196d8acSJiri Slaby spin_unlock(&i->lock); 1409196d8acSJiri Slaby 141934014d5SJiri Slaby pr_debug("%s(%d): end\n", __func__, irq); 1429196d8acSJiri Slaby 1439196d8acSJiri Slaby return IRQ_RETVAL(handled); 1449196d8acSJiri Slaby } 1459196d8acSJiri Slaby 1469196d8acSJiri Slaby /* 1479196d8acSJiri Slaby * To support ISA shared interrupts, we need to have one interrupt 1489196d8acSJiri Slaby * handler that ensures that the IRQ line has been deasserted 1499196d8acSJiri Slaby * before returning. Failing to do this will result in the IRQ 1509196d8acSJiri Slaby * line being stuck active, and, since ISA irqs are edge triggered, 1519196d8acSJiri Slaby * no more IRQs will be seen. 1529196d8acSJiri Slaby */ 1539196d8acSJiri Slaby static void serial_do_unlink(struct irq_info *i, struct uart_8250_port *up) 1549196d8acSJiri Slaby { 1559196d8acSJiri Slaby spin_lock_irq(&i->lock); 1569196d8acSJiri Slaby 1579196d8acSJiri Slaby if (!list_empty(i->head)) { 1589196d8acSJiri Slaby if (i->head == &up->list) 1599196d8acSJiri Slaby i->head = i->head->next; 1609196d8acSJiri Slaby list_del(&up->list); 1619196d8acSJiri Slaby } else { 1629196d8acSJiri Slaby BUG_ON(i->head != &up->list); 1639196d8acSJiri Slaby i->head = NULL; 1649196d8acSJiri Slaby } 1659196d8acSJiri Slaby spin_unlock_irq(&i->lock); 1669196d8acSJiri Slaby /* List empty so throw away the hash node */ 1679196d8acSJiri Slaby if (i->head == NULL) { 1689196d8acSJiri Slaby hlist_del(&i->node); 1699196d8acSJiri Slaby kfree(i); 1709196d8acSJiri Slaby } 1719196d8acSJiri Slaby } 1729196d8acSJiri Slaby 1739196d8acSJiri Slaby static int serial_link_irq_chain(struct uart_8250_port *up) 1749196d8acSJiri Slaby { 1759196d8acSJiri Slaby struct hlist_head *h; 1769196d8acSJiri Slaby struct irq_info *i; 1777febbcbcSAndy Shevchenko int ret; 1789196d8acSJiri Slaby 1799196d8acSJiri Slaby mutex_lock(&hash_mutex); 1809196d8acSJiri Slaby 1819196d8acSJiri Slaby h = &irq_lists[up->port.irq % NR_IRQ_HASH]; 1829196d8acSJiri Slaby 18389e78001SChristophe JAILLET hlist_for_each_entry(i, h, node) 1849196d8acSJiri Slaby if (i->irq == up->port.irq) 1859196d8acSJiri Slaby break; 1869196d8acSJiri Slaby 18789e78001SChristophe JAILLET if (i == NULL) { 1889196d8acSJiri Slaby i = kzalloc(sizeof(struct irq_info), GFP_KERNEL); 1899196d8acSJiri Slaby if (i == NULL) { 1909196d8acSJiri Slaby mutex_unlock(&hash_mutex); 1919196d8acSJiri Slaby return -ENOMEM; 1929196d8acSJiri Slaby } 1939196d8acSJiri Slaby spin_lock_init(&i->lock); 1949196d8acSJiri Slaby i->irq = up->port.irq; 1959196d8acSJiri Slaby hlist_add_head(&i->node, h); 1969196d8acSJiri Slaby } 1979196d8acSJiri Slaby mutex_unlock(&hash_mutex); 1989196d8acSJiri Slaby 1999196d8acSJiri Slaby spin_lock_irq(&i->lock); 2009196d8acSJiri Slaby 2019196d8acSJiri Slaby if (i->head) { 2029196d8acSJiri Slaby list_add(&up->list, i->head); 2039196d8acSJiri Slaby spin_unlock_irq(&i->lock); 2049196d8acSJiri Slaby 2059196d8acSJiri Slaby ret = 0; 2069196d8acSJiri Slaby } else { 2079196d8acSJiri Slaby INIT_LIST_HEAD(&up->list); 2089196d8acSJiri Slaby i->head = &up->list; 2099196d8acSJiri Slaby spin_unlock_irq(&i->lock); 2109196d8acSJiri Slaby ret = request_irq(up->port.irq, serial8250_interrupt, 2117febbcbcSAndy Shevchenko up->port.irqflags, up->port.name, i); 2129196d8acSJiri Slaby if (ret < 0) 2139196d8acSJiri Slaby serial_do_unlink(i, up); 2149196d8acSJiri Slaby } 2159196d8acSJiri Slaby 2169196d8acSJiri Slaby return ret; 2179196d8acSJiri Slaby } 2189196d8acSJiri Slaby 2199196d8acSJiri Slaby static void serial_unlink_irq_chain(struct uart_8250_port *up) 2209196d8acSJiri Slaby { 2219196d8acSJiri Slaby struct irq_info *i; 2229196d8acSJiri Slaby struct hlist_head *h; 2239196d8acSJiri Slaby 2249196d8acSJiri Slaby mutex_lock(&hash_mutex); 2259196d8acSJiri Slaby 2269196d8acSJiri Slaby h = &irq_lists[up->port.irq % NR_IRQ_HASH]; 2279196d8acSJiri Slaby 22889e78001SChristophe JAILLET hlist_for_each_entry(i, h, node) 2299196d8acSJiri Slaby if (i->irq == up->port.irq) 2309196d8acSJiri Slaby break; 2319196d8acSJiri Slaby 23289e78001SChristophe JAILLET BUG_ON(i == NULL); 2339196d8acSJiri Slaby BUG_ON(i->head == NULL); 2349196d8acSJiri Slaby 2359196d8acSJiri Slaby if (list_empty(i->head)) 2369196d8acSJiri Slaby free_irq(up->port.irq, i); 2379196d8acSJiri Slaby 2389196d8acSJiri Slaby serial_do_unlink(i, up); 2399196d8acSJiri Slaby mutex_unlock(&hash_mutex); 2409196d8acSJiri Slaby } 2419196d8acSJiri Slaby 2429196d8acSJiri Slaby /* 2439196d8acSJiri Slaby * This function is used to handle ports that do not have an 2449196d8acSJiri Slaby * interrupt. This doesn't work very well for 16450's, but gives 2459196d8acSJiri Slaby * barely passable results for a 16550A. (Although at the expense 2469196d8acSJiri Slaby * of much CPU overhead). 2479196d8acSJiri Slaby */ 2487c335645SKees Cook static void serial8250_timeout(struct timer_list *t) 2499196d8acSJiri Slaby { 2507c335645SKees Cook struct uart_8250_port *up = from_timer(up, t, timer); 2519196d8acSJiri Slaby 2529196d8acSJiri Slaby up->port.handle_irq(&up->port); 2539196d8acSJiri Slaby mod_timer(&up->timer, jiffies + uart_poll_timeout(&up->port)); 2549196d8acSJiri Slaby } 2559196d8acSJiri Slaby 2567c335645SKees Cook static void serial8250_backup_timeout(struct timer_list *t) 2579196d8acSJiri Slaby { 2587c335645SKees Cook struct uart_8250_port *up = from_timer(up, t, timer); 2599196d8acSJiri Slaby unsigned int iir, ier = 0, lsr; 2609196d8acSJiri Slaby unsigned long flags; 2619196d8acSJiri Slaby 2629196d8acSJiri Slaby spin_lock_irqsave(&up->port.lock, flags); 2639196d8acSJiri Slaby 2649196d8acSJiri Slaby /* 2659196d8acSJiri Slaby * Must disable interrupts or else we risk racing with the interrupt 2669196d8acSJiri Slaby * based handler. 2679196d8acSJiri Slaby */ 2689196d8acSJiri Slaby if (up->port.irq) { 2699196d8acSJiri Slaby ier = serial_in(up, UART_IER); 2709196d8acSJiri Slaby serial_out(up, UART_IER, 0); 2719196d8acSJiri Slaby } 2729196d8acSJiri Slaby 2739196d8acSJiri Slaby iir = serial_in(up, UART_IIR); 2749196d8acSJiri Slaby 2759196d8acSJiri Slaby /* 2769196d8acSJiri Slaby * This should be a safe test for anyone who doesn't trust the 2779196d8acSJiri Slaby * IIR bits on their UART, but it's specifically designed for 2789196d8acSJiri Slaby * the "Diva" UART used on the management processor on many HP 2799196d8acSJiri Slaby * ia64 and parisc boxes. 2809196d8acSJiri Slaby */ 281bdb70c42SIlpo Järvinen lsr = serial_lsr_in(up); 2829196d8acSJiri Slaby if ((iir & UART_IIR_NO_INT) && (up->ier & UART_IER_THRI) && 2839196d8acSJiri Slaby (!uart_circ_empty(&up->port.state->xmit) || up->port.x_char) && 2849196d8acSJiri Slaby (lsr & UART_LSR_THRE)) { 2859196d8acSJiri Slaby iir &= ~(UART_IIR_ID | UART_IIR_NO_INT); 2869196d8acSJiri Slaby iir |= UART_IIR_THRI; 2879196d8acSJiri Slaby } 2889196d8acSJiri Slaby 2899196d8acSJiri Slaby if (!(iir & UART_IIR_NO_INT)) 2909196d8acSJiri Slaby serial8250_tx_chars(up); 2919196d8acSJiri Slaby 2929196d8acSJiri Slaby if (up->port.irq) 2939196d8acSJiri Slaby serial_out(up, UART_IER, ier); 2949196d8acSJiri Slaby 2959196d8acSJiri Slaby spin_unlock_irqrestore(&up->port.lock, flags); 2969196d8acSJiri Slaby 2979196d8acSJiri Slaby /* Standard timer interval plus 0.2s to keep the port running */ 2989196d8acSJiri Slaby mod_timer(&up->timer, 2999196d8acSJiri Slaby jiffies + uart_poll_timeout(&up->port) + HZ / 5); 3009196d8acSJiri Slaby } 3019196d8acSJiri Slaby 302039d4926SIlpo Järvinen static void univ8250_setup_timer(struct uart_8250_port *up) 303a4416cd1SPeter Hurley { 304a4416cd1SPeter Hurley struct uart_port *port = &up->port; 305a4416cd1SPeter Hurley 306a4416cd1SPeter Hurley /* 307a4416cd1SPeter Hurley * The above check will only give an accurate result the first time 308a4416cd1SPeter Hurley * the port is opened so this value needs to be preserved. 309a4416cd1SPeter Hurley */ 310a4416cd1SPeter Hurley if (up->bugs & UART_BUG_THRE) { 311286d9b8cSAndy Shevchenko pr_debug("%s - using backup timer\n", port->name); 312a4416cd1SPeter Hurley 313841b86f3SKees Cook up->timer.function = serial8250_backup_timeout; 314a4416cd1SPeter Hurley mod_timer(&up->timer, jiffies + 315a4416cd1SPeter Hurley uart_poll_timeout(port) + HZ / 5); 316a4416cd1SPeter Hurley } 317a4416cd1SPeter Hurley 318a4416cd1SPeter Hurley /* 319a4416cd1SPeter Hurley * If the "interrupt" for this port doesn't correspond with any 320a4416cd1SPeter Hurley * hardware interrupt, we use a timer-based system. The original 321a4416cd1SPeter Hurley * driver used to do this with IRQ0. 322a4416cd1SPeter Hurley */ 32326f75916SChristophe JAILLET if (!port->irq) 324a4416cd1SPeter Hurley mod_timer(&up->timer, jiffies + uart_poll_timeout(port)); 325039d4926SIlpo Järvinen } 326a4416cd1SPeter Hurley 327039d4926SIlpo Järvinen static int univ8250_setup_irq(struct uart_8250_port *up) 328039d4926SIlpo Järvinen { 329039d4926SIlpo Järvinen struct uart_port *port = &up->port; 330039d4926SIlpo Järvinen 331039d4926SIlpo Järvinen if (port->irq) 332039d4926SIlpo Järvinen return serial_link_irq_chain(up); 333039d4926SIlpo Järvinen 334039d4926SIlpo Järvinen return 0; 335a4416cd1SPeter Hurley } 336a4416cd1SPeter Hurley 337a4416cd1SPeter Hurley static void univ8250_release_irq(struct uart_8250_port *up) 338a4416cd1SPeter Hurley { 339a4416cd1SPeter Hurley struct uart_port *port = &up->port; 340a4416cd1SPeter Hurley 341a4416cd1SPeter Hurley del_timer_sync(&up->timer); 342841b86f3SKees Cook up->timer.function = serial8250_timeout; 343a4416cd1SPeter Hurley if (port->irq) 344a4416cd1SPeter Hurley serial_unlink_irq_chain(up); 345a4416cd1SPeter Hurley } 346a4416cd1SPeter Hurley 347cd52b759SPeter Hurley #ifdef CONFIG_SERIAL_8250_RSA 3489196d8acSJiri Slaby static int serial8250_request_rsa_resource(struct uart_8250_port *up) 3499196d8acSJiri Slaby { 3509196d8acSJiri Slaby unsigned long start = UART_RSA_BASE << up->port.regshift; 3519196d8acSJiri Slaby unsigned int size = 8 << up->port.regshift; 3529196d8acSJiri Slaby struct uart_port *port = &up->port; 3539196d8acSJiri Slaby int ret = -EINVAL; 3549196d8acSJiri Slaby 3559196d8acSJiri Slaby switch (port->iotype) { 3569196d8acSJiri Slaby case UPIO_HUB6: 3579196d8acSJiri Slaby case UPIO_PORT: 3589196d8acSJiri Slaby start += port->iobase; 3599196d8acSJiri Slaby if (request_region(start, size, "serial-rsa")) 3609196d8acSJiri Slaby ret = 0; 3619196d8acSJiri Slaby else 3629196d8acSJiri Slaby ret = -EBUSY; 3639196d8acSJiri Slaby break; 3649196d8acSJiri Slaby } 3659196d8acSJiri Slaby 3669196d8acSJiri Slaby return ret; 3679196d8acSJiri Slaby } 3689196d8acSJiri Slaby 3699196d8acSJiri Slaby static void serial8250_release_rsa_resource(struct uart_8250_port *up) 3709196d8acSJiri Slaby { 3719196d8acSJiri Slaby unsigned long offset = UART_RSA_BASE << up->port.regshift; 3729196d8acSJiri Slaby unsigned int size = 8 << up->port.regshift; 3739196d8acSJiri Slaby struct uart_port *port = &up->port; 3749196d8acSJiri Slaby 3759196d8acSJiri Slaby switch (port->iotype) { 3769196d8acSJiri Slaby case UPIO_HUB6: 3779196d8acSJiri Slaby case UPIO_PORT: 3789196d8acSJiri Slaby release_region(port->iobase + offset, size); 3799196d8acSJiri Slaby break; 3809196d8acSJiri Slaby } 3819196d8acSJiri Slaby } 382cd52b759SPeter Hurley #endif 3839196d8acSJiri Slaby 38440375393SPeter Hurley static const struct uart_ops *base_ops; 38540375393SPeter Hurley static struct uart_ops univ8250_port_ops; 38640375393SPeter Hurley 387a4416cd1SPeter Hurley static const struct uart_8250_ops univ8250_driver_ops = { 388a4416cd1SPeter Hurley .setup_irq = univ8250_setup_irq, 389a4416cd1SPeter Hurley .release_irq = univ8250_release_irq, 390039d4926SIlpo Järvinen .setup_timer = univ8250_setup_timer, 391a4416cd1SPeter Hurley }; 392a4416cd1SPeter Hurley 3939196d8acSJiri Slaby static struct uart_8250_port serial8250_ports[UART_NR]; 3949196d8acSJiri Slaby 395ae14a795SSebastian Andrzej Siewior /** 396ae14a795SSebastian Andrzej Siewior * serial8250_get_port - retrieve struct uart_8250_port 397ae14a795SSebastian Andrzej Siewior * @line: serial line number 398ae14a795SSebastian Andrzej Siewior * 399ae14a795SSebastian Andrzej Siewior * This function retrieves struct uart_8250_port for the specific line. 400ae14a795SSebastian Andrzej Siewior * This struct *must* *not* be used to perform a 8250 or serial core operation 401ae14a795SSebastian Andrzej Siewior * which is not accessible otherwise. Its only purpose is to make the struct 402ae14a795SSebastian Andrzej Siewior * accessible to the runtime-pm callbacks for context suspend/restore. 403ae14a795SSebastian Andrzej Siewior * The lock assumption made here is none because runtime-pm suspend/resume 404ae14a795SSebastian Andrzej Siewior * callbacks should not be invoked if there is any operation performed on the 405ae14a795SSebastian Andrzej Siewior * port. 406ae14a795SSebastian Andrzej Siewior */ 407ae14a795SSebastian Andrzej Siewior struct uart_8250_port *serial8250_get_port(int line) 408ae14a795SSebastian Andrzej Siewior { 409ae14a795SSebastian Andrzej Siewior return &serial8250_ports[line]; 410ae14a795SSebastian Andrzej Siewior } 411ae14a795SSebastian Andrzej Siewior EXPORT_SYMBOL_GPL(serial8250_get_port); 412ae14a795SSebastian Andrzej Siewior 4139196d8acSJiri Slaby static void (*serial8250_isa_config)(int port, struct uart_port *up, 41498838d95SEd Blake u32 *capabilities); 4159196d8acSJiri Slaby 4169196d8acSJiri Slaby void serial8250_set_isa_configurator( 41798838d95SEd Blake void (*v)(int port, struct uart_port *up, u32 *capabilities)) 4189196d8acSJiri Slaby { 4199196d8acSJiri Slaby serial8250_isa_config = v; 4209196d8acSJiri Slaby } 4219196d8acSJiri Slaby EXPORT_SYMBOL(serial8250_set_isa_configurator); 4229196d8acSJiri Slaby 42340375393SPeter Hurley #ifdef CONFIG_SERIAL_8250_RSA 42440375393SPeter Hurley 42540375393SPeter Hurley static void univ8250_config_port(struct uart_port *port, int flags) 42640375393SPeter Hurley { 42740375393SPeter Hurley struct uart_8250_port *up = up_to_u8250p(port); 42840375393SPeter Hurley 42940375393SPeter Hurley up->probe &= ~UART_PROBE_RSA; 43040375393SPeter Hurley if (port->type == PORT_RSA) { 43140375393SPeter Hurley if (serial8250_request_rsa_resource(up) == 0) 43240375393SPeter Hurley up->probe |= UART_PROBE_RSA; 43340375393SPeter Hurley } else if (flags & UART_CONFIG_TYPE) { 43440375393SPeter Hurley int i; 43540375393SPeter Hurley 43640375393SPeter Hurley for (i = 0; i < probe_rsa_count; i++) { 43740375393SPeter Hurley if (probe_rsa[i] == up->port.iobase) { 43840375393SPeter Hurley if (serial8250_request_rsa_resource(up) == 0) 43940375393SPeter Hurley up->probe |= UART_PROBE_RSA; 44040375393SPeter Hurley break; 44140375393SPeter Hurley } 44240375393SPeter Hurley } 44340375393SPeter Hurley } 44440375393SPeter Hurley 44540375393SPeter Hurley base_ops->config_port(port, flags); 44640375393SPeter Hurley 44740375393SPeter Hurley if (port->type != PORT_RSA && up->probe & UART_PROBE_RSA) 44840375393SPeter Hurley serial8250_release_rsa_resource(up); 44940375393SPeter Hurley } 45040375393SPeter Hurley 45140375393SPeter Hurley static int univ8250_request_port(struct uart_port *port) 45240375393SPeter Hurley { 45340375393SPeter Hurley struct uart_8250_port *up = up_to_u8250p(port); 45440375393SPeter Hurley int ret; 45540375393SPeter Hurley 45640375393SPeter Hurley ret = base_ops->request_port(port); 45740375393SPeter Hurley if (ret == 0 && port->type == PORT_RSA) { 45840375393SPeter Hurley ret = serial8250_request_rsa_resource(up); 45940375393SPeter Hurley if (ret < 0) 46040375393SPeter Hurley base_ops->release_port(port); 46140375393SPeter Hurley } 46240375393SPeter Hurley 46340375393SPeter Hurley return ret; 46440375393SPeter Hurley } 46540375393SPeter Hurley 46640375393SPeter Hurley static void univ8250_release_port(struct uart_port *port) 46740375393SPeter Hurley { 46840375393SPeter Hurley struct uart_8250_port *up = up_to_u8250p(port); 46940375393SPeter Hurley 47040375393SPeter Hurley if (port->type == PORT_RSA) 47140375393SPeter Hurley serial8250_release_rsa_resource(up); 47240375393SPeter Hurley base_ops->release_port(port); 47340375393SPeter Hurley } 47440375393SPeter Hurley 47540375393SPeter Hurley static void univ8250_rsa_support(struct uart_ops *ops) 47640375393SPeter Hurley { 47740375393SPeter Hurley ops->config_port = univ8250_config_port; 47840375393SPeter Hurley ops->request_port = univ8250_request_port; 47940375393SPeter Hurley ops->release_port = univ8250_release_port; 48040375393SPeter Hurley } 48140375393SPeter Hurley 48240375393SPeter Hurley #else 48340375393SPeter Hurley #define univ8250_rsa_support(x) do { } while (0) 48440375393SPeter Hurley #endif /* CONFIG_SERIAL_8250_RSA */ 48540375393SPeter Hurley 486c7ac15ceSAndy Shevchenko static inline void serial8250_apply_quirks(struct uart_8250_port *up) 487c7ac15ceSAndy Shevchenko { 488c7ac15ceSAndy Shevchenko up->port.quirks |= skip_txen_test ? UPQ_NO_TXEN_TEST : 0; 489c7ac15ceSAndy Shevchenko } 490c7ac15ceSAndy Shevchenko 491*9d86719fSTony Lindgren static struct uart_8250_port *serial8250_setup_port(int index) 492*9d86719fSTony Lindgren { 493*9d86719fSTony Lindgren struct uart_8250_port *up; 494*9d86719fSTony Lindgren 495*9d86719fSTony Lindgren if (index >= UART_NR) 496*9d86719fSTony Lindgren return NULL; 497*9d86719fSTony Lindgren 498*9d86719fSTony Lindgren up = &serial8250_ports[index]; 499*9d86719fSTony Lindgren up->port.line = index; 500*9d86719fSTony Lindgren 501*9d86719fSTony Lindgren serial8250_init_port(up); 502*9d86719fSTony Lindgren if (!base_ops) 503*9d86719fSTony Lindgren base_ops = up->port.ops; 504*9d86719fSTony Lindgren up->port.ops = &univ8250_port_ops; 505*9d86719fSTony Lindgren 506*9d86719fSTony Lindgren timer_setup(&up->timer, serial8250_timeout, 0); 507*9d86719fSTony Lindgren 508*9d86719fSTony Lindgren up->ops = &univ8250_driver_ops; 509*9d86719fSTony Lindgren 510*9d86719fSTony Lindgren if (IS_ENABLED(CONFIG_ALPHA_JENSEN) || 511*9d86719fSTony Lindgren (IS_ENABLED(CONFIG_ALPHA_GENERIC) && alpha_jensen())) 512*9d86719fSTony Lindgren up->port.set_mctrl = alpha_jensen_set_mctrl; 513*9d86719fSTony Lindgren 514*9d86719fSTony Lindgren serial8250_set_defaults(up); 515*9d86719fSTony Lindgren 516*9d86719fSTony Lindgren return up; 517*9d86719fSTony Lindgren } 518*9d86719fSTony Lindgren 5199196d8acSJiri Slaby static void __init serial8250_isa_init_ports(void) 5209196d8acSJiri Slaby { 5219196d8acSJiri Slaby struct uart_8250_port *up; 5229196d8acSJiri Slaby static int first = 1; 5239196d8acSJiri Slaby int i, irqflag = 0; 5249196d8acSJiri Slaby 5259196d8acSJiri Slaby if (!first) 5269196d8acSJiri Slaby return; 5279196d8acSJiri Slaby first = 0; 5289196d8acSJiri Slaby 5299196d8acSJiri Slaby if (nr_uarts > UART_NR) 5309196d8acSJiri Slaby nr_uarts = UART_NR; 5319196d8acSJiri Slaby 532*9d86719fSTony Lindgren /* 533*9d86719fSTony Lindgren * Set up initial isa ports based on nr_uart module param, or else 534*9d86719fSTony Lindgren * default to CONFIG_SERIAL_8250_RUNTIME_UARTS. Note that we do not 535*9d86719fSTony Lindgren * need to increase nr_uarts when setting up the initial isa ports. 536*9d86719fSTony Lindgren */ 537*9d86719fSTony Lindgren for (i = 0; i < nr_uarts; i++) 538*9d86719fSTony Lindgren serial8250_setup_port(i); 5399196d8acSJiri Slaby 54040375393SPeter Hurley /* chain base port ops to support Remote Supervisor Adapter */ 54140375393SPeter Hurley univ8250_port_ops = *base_ops; 54240375393SPeter Hurley univ8250_rsa_support(&univ8250_port_ops); 54340375393SPeter Hurley 5449196d8acSJiri Slaby if (share_irqs) 5459196d8acSJiri Slaby irqflag = IRQF_SHARED; 5469196d8acSJiri Slaby 5479196d8acSJiri Slaby for (i = 0, up = serial8250_ports; 5489196d8acSJiri Slaby i < ARRAY_SIZE(old_serial_port) && i < nr_uarts; 5499196d8acSJiri Slaby i++, up++) { 5509196d8acSJiri Slaby struct uart_port *port = &up->port; 5519196d8acSJiri Slaby 5529196d8acSJiri Slaby port->iobase = old_serial_port[i].port; 5539196d8acSJiri Slaby port->irq = irq_canonicalize(old_serial_port[i].irq); 554b0f8aed2SJiri Slaby port->irqflags = 0; 5559196d8acSJiri Slaby port->uartclk = old_serial_port[i].baud_base * 16; 5569196d8acSJiri Slaby port->flags = old_serial_port[i].flags; 557b0f8aed2SJiri Slaby port->hub6 = 0; 5589196d8acSJiri Slaby port->membase = old_serial_port[i].iomem_base; 5599196d8acSJiri Slaby port->iotype = old_serial_port[i].io_type; 5609196d8acSJiri Slaby port->regshift = old_serial_port[i].iomem_reg_shift; 5611a53e079SPeter Hurley 5629196d8acSJiri Slaby port->irqflags |= irqflag; 5639196d8acSJiri Slaby if (serial8250_isa_config != NULL) 5649196d8acSJiri Slaby serial8250_isa_config(i, &up->port, &up->capabilities); 5659196d8acSJiri Slaby } 5669196d8acSJiri Slaby } 5679196d8acSJiri Slaby 5689196d8acSJiri Slaby static void __init 5699196d8acSJiri Slaby serial8250_register_ports(struct uart_driver *drv, struct device *dev) 5709196d8acSJiri Slaby { 5719196d8acSJiri Slaby int i; 5729196d8acSJiri Slaby 5739196d8acSJiri Slaby for (i = 0; i < nr_uarts; i++) { 5749196d8acSJiri Slaby struct uart_8250_port *up = &serial8250_ports[i]; 5759196d8acSJiri Slaby 576e4fda3a0SMaciej S. Szmigiero if (up->port.type == PORT_8250_CIR) 577e4fda3a0SMaciej S. Szmigiero continue; 578e4fda3a0SMaciej S. Szmigiero 5799196d8acSJiri Slaby if (up->port.dev) 5809196d8acSJiri Slaby continue; 5819196d8acSJiri Slaby 5829196d8acSJiri Slaby up->port.dev = dev; 5839196d8acSJiri Slaby 584452b9b24SJohn Ogness if (uart_console_registered(&up->port)) 585f9b11229SIlpo Järvinen pm_runtime_get_sync(up->port.dev); 586f9b11229SIlpo Järvinen 587c7ac15ceSAndy Shevchenko serial8250_apply_quirks(up); 5889196d8acSJiri Slaby uart_add_one_port(drv, &up->port); 5899196d8acSJiri Slaby } 5909196d8acSJiri Slaby } 5919196d8acSJiri Slaby 5929196d8acSJiri Slaby #ifdef CONFIG_SERIAL_8250_CONSOLE 5939196d8acSJiri Slaby 5946e281571SPeter Hurley static void univ8250_console_write(struct console *co, const char *s, 5956e281571SPeter Hurley unsigned int count) 5969196d8acSJiri Slaby { 5976e281571SPeter Hurley struct uart_8250_port *up = &serial8250_ports[co->index]; 5986e281571SPeter Hurley 5996e281571SPeter Hurley serial8250_console_write(up, s, count); 6006e281571SPeter Hurley } 6016e281571SPeter Hurley 6026e281571SPeter Hurley static int univ8250_console_setup(struct console *co, char *options) 6036e281571SPeter Hurley { 604*9d86719fSTony Lindgren struct uart_8250_port *up; 60587515772SPeter Hurley struct uart_port *port; 606*9d86719fSTony Lindgren int retval, i; 6076e281571SPeter Hurley 6089196d8acSJiri Slaby /* 6099196d8acSJiri Slaby * Check whether an invalid uart number has been specified, and 6109196d8acSJiri Slaby * if so, search for the first available port that does have 6119196d8acSJiri Slaby * console support. 6129196d8acSJiri Slaby */ 613*9d86719fSTony Lindgren if (co->index >= UART_NR) 6149196d8acSJiri Slaby co->index = 0; 615*9d86719fSTony Lindgren 616*9d86719fSTony Lindgren /* 617*9d86719fSTony Lindgren * If the console is past the initial isa ports, init more ports up to 618*9d86719fSTony Lindgren * co->index as needed and increment nr_uarts accordingly. 619*9d86719fSTony Lindgren */ 620*9d86719fSTony Lindgren for (i = nr_uarts; i <= co->index; i++) { 621*9d86719fSTony Lindgren up = serial8250_setup_port(i); 622*9d86719fSTony Lindgren if (!up) 623*9d86719fSTony Lindgren return -ENODEV; 624*9d86719fSTony Lindgren nr_uarts++; 625*9d86719fSTony Lindgren } 626*9d86719fSTony Lindgren 62787515772SPeter Hurley port = &serial8250_ports[co->index].port; 6286e281571SPeter Hurley /* link port to console */ 62987515772SPeter Hurley port->cons = co; 6309196d8acSJiri Slaby 631d70a7b16SPeter Hurley retval = serial8250_console_setup(port, options, false); 632d70a7b16SPeter Hurley if (retval != 0) 633d70a7b16SPeter Hurley port->cons = NULL; 634d70a7b16SPeter Hurley return retval; 6359196d8acSJiri Slaby } 6369196d8acSJiri Slaby 637bedb404eSAndy Shevchenko static int univ8250_console_exit(struct console *co) 638bedb404eSAndy Shevchenko { 639bedb404eSAndy Shevchenko struct uart_port *port; 640bedb404eSAndy Shevchenko 641bedb404eSAndy Shevchenko port = &serial8250_ports[co->index].port; 642bedb404eSAndy Shevchenko return serial8250_console_exit(port); 643bedb404eSAndy Shevchenko } 644bedb404eSAndy Shevchenko 645c7cef0a8SPeter Hurley /** 6466e281571SPeter Hurley * univ8250_console_match - non-standard console matching 647c7cef0a8SPeter Hurley * @co: registering console 648c7cef0a8SPeter Hurley * @name: name from console command line 649c7cef0a8SPeter Hurley * @idx: index from console command line 650c7cef0a8SPeter Hurley * @options: ptr to option string from console command line 651c7cef0a8SPeter Hurley * 652c7cef0a8SPeter Hurley * Only attempts to match console command lines of the form: 653bd94c407SMasahiro Yamada * console=uart[8250],io|mmio|mmio16|mmio32,<addr>[,<options>] 654ca782f16SPeter Hurley * console=uart[8250],0x<addr>[,<options>] 655c7cef0a8SPeter Hurley * This form is used to register an initial earlycon boot console and 656c7cef0a8SPeter Hurley * replace it with the serial8250_console at 8250 driver init. 657c7cef0a8SPeter Hurley * 658c7cef0a8SPeter Hurley * Performs console setup for a match (as required by interface) 659ca782f16SPeter Hurley * If no <options> are specified, then assume the h/w is already setup. 660c7cef0a8SPeter Hurley * 661c7cef0a8SPeter Hurley * Returns 0 if console matches; otherwise non-zero to use default matching 662c7cef0a8SPeter Hurley */ 6636e281571SPeter Hurley static int univ8250_console_match(struct console *co, char *name, int idx, 664c7cef0a8SPeter Hurley char *options) 6659196d8acSJiri Slaby { 666c7cef0a8SPeter Hurley char match[] = "uart"; /* 8250-specific earlycon name */ 667c7cef0a8SPeter Hurley unsigned char iotype; 66846e36683SAlexander Sverdlin resource_size_t addr; 669c7cef0a8SPeter Hurley int i; 670c7cef0a8SPeter Hurley 671c7cef0a8SPeter Hurley if (strncmp(name, match, 4) != 0) 672c7cef0a8SPeter Hurley return -ENODEV; 673c7cef0a8SPeter Hurley 674c7cef0a8SPeter Hurley if (uart_parse_earlycon(options, &iotype, &addr, &options)) 675c7cef0a8SPeter Hurley return -ENODEV; 676c7cef0a8SPeter Hurley 677c7cef0a8SPeter Hurley /* try to match the port specified on the command line */ 678c7cef0a8SPeter Hurley for (i = 0; i < nr_uarts; i++) { 679c7cef0a8SPeter Hurley struct uart_port *port = &serial8250_ports[i].port; 680c7cef0a8SPeter Hurley 681c7cef0a8SPeter Hurley if (port->iotype != iotype) 682c7cef0a8SPeter Hurley continue; 683bd94c407SMasahiro Yamada if ((iotype == UPIO_MEM || iotype == UPIO_MEM16 || 684bd94c407SMasahiro Yamada iotype == UPIO_MEM32 || iotype == UPIO_MEM32BE) 685bd94c407SMasahiro Yamada && (port->mapbase != addr)) 686c7cef0a8SPeter Hurley continue; 687c7cef0a8SPeter Hurley if (iotype == UPIO_PORT && port->iobase != addr) 688c7cef0a8SPeter Hurley continue; 689c7cef0a8SPeter Hurley 690c7cef0a8SPeter Hurley co->index = i; 69187515772SPeter Hurley port->cons = co; 69287515772SPeter Hurley return serial8250_console_setup(port, options, true); 693c7cef0a8SPeter Hurley } 694c7cef0a8SPeter Hurley 695c7cef0a8SPeter Hurley return -ENODEV; 6969196d8acSJiri Slaby } 6979196d8acSJiri Slaby 6986e281571SPeter Hurley static struct console univ8250_console = { 6999196d8acSJiri Slaby .name = "ttyS", 7006e281571SPeter Hurley .write = univ8250_console_write, 7019196d8acSJiri Slaby .device = uart_console_device, 7026e281571SPeter Hurley .setup = univ8250_console_setup, 703bedb404eSAndy Shevchenko .exit = univ8250_console_exit, 7046e281571SPeter Hurley .match = univ8250_console_match, 7056741f551SHerbert Xu .flags = CON_PRINTBUFFER | CON_ANYTIME, 7069196d8acSJiri Slaby .index = -1, 7079196d8acSJiri Slaby .data = &serial8250_reg, 7089196d8acSJiri Slaby }; 7099196d8acSJiri Slaby 7106e281571SPeter Hurley static int __init univ8250_console_init(void) 7119196d8acSJiri Slaby { 71259cfc45fSJan Kiszka if (nr_uarts == 0) 71359cfc45fSJan Kiszka return -ENODEV; 71459cfc45fSJan Kiszka 7159196d8acSJiri Slaby serial8250_isa_init_ports(); 7166e281571SPeter Hurley register_console(&univ8250_console); 7179196d8acSJiri Slaby return 0; 7189196d8acSJiri Slaby } 7196e281571SPeter Hurley console_initcall(univ8250_console_init); 7209196d8acSJiri Slaby 721149a44ccSAnton Wuerfel #define SERIAL8250_CONSOLE (&univ8250_console) 7229196d8acSJiri Slaby #else 7239196d8acSJiri Slaby #define SERIAL8250_CONSOLE NULL 7249196d8acSJiri Slaby #endif 7259196d8acSJiri Slaby 7269196d8acSJiri Slaby static struct uart_driver serial8250_reg = { 7279196d8acSJiri Slaby .owner = THIS_MODULE, 7289196d8acSJiri Slaby .driver_name = "serial", 7299196d8acSJiri Slaby .dev_name = "ttyS", 7309196d8acSJiri Slaby .major = TTY_MAJOR, 7319196d8acSJiri Slaby .minor = 64, 7329196d8acSJiri Slaby .cons = SERIAL8250_CONSOLE, 7339196d8acSJiri Slaby }; 7349196d8acSJiri Slaby 7359196d8acSJiri Slaby /* 7369196d8acSJiri Slaby * early_serial_setup - early registration for 8250 ports 7379196d8acSJiri Slaby * 7389196d8acSJiri Slaby * Setup an 8250 port structure prior to console initialisation. Use 7399196d8acSJiri Slaby * after console initialisation will cause undefined behaviour. 7409196d8acSJiri Slaby */ 7419196d8acSJiri Slaby int __init early_serial_setup(struct uart_port *port) 7429196d8acSJiri Slaby { 7439196d8acSJiri Slaby struct uart_port *p; 7449196d8acSJiri Slaby 74559cfc45fSJan Kiszka if (port->line >= ARRAY_SIZE(serial8250_ports) || nr_uarts == 0) 7469196d8acSJiri Slaby return -ENODEV; 7479196d8acSJiri Slaby 7489196d8acSJiri Slaby serial8250_isa_init_ports(); 7499196d8acSJiri Slaby p = &serial8250_ports[port->line].port; 7509196d8acSJiri Slaby p->iobase = port->iobase; 7519196d8acSJiri Slaby p->membase = port->membase; 7529196d8acSJiri Slaby p->irq = port->irq; 7539196d8acSJiri Slaby p->irqflags = port->irqflags; 7549196d8acSJiri Slaby p->uartclk = port->uartclk; 7559196d8acSJiri Slaby p->fifosize = port->fifosize; 7569196d8acSJiri Slaby p->regshift = port->regshift; 7579196d8acSJiri Slaby p->iotype = port->iotype; 7589196d8acSJiri Slaby p->flags = port->flags; 7599196d8acSJiri Slaby p->mapbase = port->mapbase; 760ee97d0e3SMans Rullgard p->mapsize = port->mapsize; 7619196d8acSJiri Slaby p->private_data = port->private_data; 7629196d8acSJiri Slaby p->type = port->type; 7639196d8acSJiri Slaby p->line = port->line; 7649196d8acSJiri Slaby 7651a53e079SPeter Hurley serial8250_set_defaults(up_to_u8250p(p)); 7661a53e079SPeter Hurley 7679196d8acSJiri Slaby if (port->serial_in) 7689196d8acSJiri Slaby p->serial_in = port->serial_in; 7699196d8acSJiri Slaby if (port->serial_out) 7709196d8acSJiri Slaby p->serial_out = port->serial_out; 7719196d8acSJiri Slaby if (port->handle_irq) 7729196d8acSJiri Slaby p->handle_irq = port->handle_irq; 7739196d8acSJiri Slaby 7749196d8acSJiri Slaby return 0; 7759196d8acSJiri Slaby } 7769196d8acSJiri Slaby 7779196d8acSJiri Slaby /** 7789196d8acSJiri Slaby * serial8250_suspend_port - suspend one serial port 7799196d8acSJiri Slaby * @line: serial line number 7809196d8acSJiri Slaby * 7819196d8acSJiri Slaby * Suspend one serial port. 7829196d8acSJiri Slaby */ 7839196d8acSJiri Slaby void serial8250_suspend_port(int line) 7849196d8acSJiri Slaby { 7854516d50aSPeter Hurley struct uart_8250_port *up = &serial8250_ports[line]; 7864516d50aSPeter Hurley struct uart_port *port = &up->port; 7874516d50aSPeter Hurley 7884516d50aSPeter Hurley if (!console_suspend_enabled && uart_console(port) && 7894516d50aSPeter Hurley port->type != PORT_8250) { 7904516d50aSPeter Hurley unsigned char canary = 0xa5; 79126f75916SChristophe JAILLET 7924516d50aSPeter Hurley serial_out(up, UART_SCR, canary); 793f01a0bd8SPeter Hurley if (serial_in(up, UART_SCR) == canary) 7944516d50aSPeter Hurley up->canary = canary; 7954516d50aSPeter Hurley } 7964516d50aSPeter Hurley 7974516d50aSPeter Hurley uart_suspend_port(&serial8250_reg, port); 7989196d8acSJiri Slaby } 799b34f9fafSAnton Wuerfel EXPORT_SYMBOL(serial8250_suspend_port); 8009196d8acSJiri Slaby 8019196d8acSJiri Slaby /** 8029196d8acSJiri Slaby * serial8250_resume_port - resume one serial port 8039196d8acSJiri Slaby * @line: serial line number 8049196d8acSJiri Slaby * 8059196d8acSJiri Slaby * Resume one serial port. 8069196d8acSJiri Slaby */ 8079196d8acSJiri Slaby void serial8250_resume_port(int line) 8089196d8acSJiri Slaby { 8099196d8acSJiri Slaby struct uart_8250_port *up = &serial8250_ports[line]; 8109196d8acSJiri Slaby struct uart_port *port = &up->port; 8119196d8acSJiri Slaby 8124516d50aSPeter Hurley up->canary = 0; 8134516d50aSPeter Hurley 8149196d8acSJiri Slaby if (up->capabilities & UART_NATSEMI) { 8159196d8acSJiri Slaby /* Ensure it's still in high speed mode */ 8169196d8acSJiri Slaby serial_port_out(port, UART_LCR, 0xE0); 8179196d8acSJiri Slaby 8189196d8acSJiri Slaby ns16550a_goto_highspeed(up); 8199196d8acSJiri Slaby 8209196d8acSJiri Slaby serial_port_out(port, UART_LCR, 0); 8219196d8acSJiri Slaby port->uartclk = 921600*16; 8229196d8acSJiri Slaby } 8239196d8acSJiri Slaby uart_resume_port(&serial8250_reg, port); 8249196d8acSJiri Slaby } 825b34f9fafSAnton Wuerfel EXPORT_SYMBOL(serial8250_resume_port); 8269196d8acSJiri Slaby 8279196d8acSJiri Slaby /* 8289196d8acSJiri Slaby * Register a set of serial devices attached to a platform device. The 8299196d8acSJiri Slaby * list is terminated with a zero flags entry, which means we expect 8309196d8acSJiri Slaby * all entries to have at least UPF_BOOT_AUTOCONF set. 8319196d8acSJiri Slaby */ 8329196d8acSJiri Slaby static int serial8250_probe(struct platform_device *dev) 8339196d8acSJiri Slaby { 834574de559SJingoo Han struct plat_serial8250_port *p = dev_get_platdata(&dev->dev); 8359196d8acSJiri Slaby struct uart_8250_port uart; 8369196d8acSJiri Slaby int ret, i, irqflag = 0; 8379196d8acSJiri Slaby 8389196d8acSJiri Slaby memset(&uart, 0, sizeof(uart)); 8399196d8acSJiri Slaby 8409196d8acSJiri Slaby if (share_irqs) 8419196d8acSJiri Slaby irqflag = IRQF_SHARED; 8429196d8acSJiri Slaby 8439196d8acSJiri Slaby for (i = 0; p && p->flags != 0; p++, i++) { 8449196d8acSJiri Slaby uart.port.iobase = p->iobase; 8459196d8acSJiri Slaby uart.port.membase = p->membase; 8469196d8acSJiri Slaby uart.port.irq = p->irq; 8479196d8acSJiri Slaby uart.port.irqflags = p->irqflags; 8489196d8acSJiri Slaby uart.port.uartclk = p->uartclk; 8499196d8acSJiri Slaby uart.port.regshift = p->regshift; 8509196d8acSJiri Slaby uart.port.iotype = p->iotype; 8519196d8acSJiri Slaby uart.port.flags = p->flags; 8529196d8acSJiri Slaby uart.port.mapbase = p->mapbase; 8539196d8acSJiri Slaby uart.port.hub6 = p->hub6; 854d68fefddSDmitry Safonov uart.port.has_sysrq = p->has_sysrq; 8559196d8acSJiri Slaby uart.port.private_data = p->private_data; 8569196d8acSJiri Slaby uart.port.type = p->type; 8579196d8acSJiri Slaby uart.port.serial_in = p->serial_in; 8589196d8acSJiri Slaby uart.port.serial_out = p->serial_out; 8599196d8acSJiri Slaby uart.port.handle_irq = p->handle_irq; 8609196d8acSJiri Slaby uart.port.handle_break = p->handle_break; 8619196d8acSJiri Slaby uart.port.set_termios = p->set_termios; 862db405a8fSEd Blake uart.port.set_ldisc = p->set_ldisc; 863144ef5c2SWan Ahmad Zainie uart.port.get_mctrl = p->get_mctrl; 8649196d8acSJiri Slaby uart.port.pm = p->pm; 8659196d8acSJiri Slaby uart.port.dev = &dev->dev; 8669196d8acSJiri Slaby uart.port.irqflags |= irqflag; 8679196d8acSJiri Slaby ret = serial8250_register_8250_port(&uart); 8689196d8acSJiri Slaby if (ret < 0) { 8699196d8acSJiri Slaby dev_err(&dev->dev, "unable to register port at index %d " 8709196d8acSJiri Slaby "(IO%lx MEM%llx IRQ%d): %d\n", i, 8719196d8acSJiri Slaby p->iobase, (unsigned long long)p->mapbase, 8729196d8acSJiri Slaby p->irq, ret); 8739196d8acSJiri Slaby } 8749196d8acSJiri Slaby } 8759196d8acSJiri Slaby return 0; 8769196d8acSJiri Slaby } 8779196d8acSJiri Slaby 8789196d8acSJiri Slaby /* 8799196d8acSJiri Slaby * Remove serial ports registered against a platform device. 8809196d8acSJiri Slaby */ 8819196d8acSJiri Slaby static int serial8250_remove(struct platform_device *dev) 8829196d8acSJiri Slaby { 8839196d8acSJiri Slaby int i; 8849196d8acSJiri Slaby 885317a6842SKyle McMartin for (i = 0; i < nr_uarts; i++) { 8869196d8acSJiri Slaby struct uart_8250_port *up = &serial8250_ports[i]; 8879196d8acSJiri Slaby 8889196d8acSJiri Slaby if (up->port.dev == &dev->dev) 8899196d8acSJiri Slaby serial8250_unregister_port(i); 8909196d8acSJiri Slaby } 8919196d8acSJiri Slaby return 0; 8929196d8acSJiri Slaby } 8939196d8acSJiri Slaby 8949196d8acSJiri Slaby static int serial8250_suspend(struct platform_device *dev, pm_message_t state) 8959196d8acSJiri Slaby { 8969196d8acSJiri Slaby int i; 8979196d8acSJiri Slaby 8989196d8acSJiri Slaby for (i = 0; i < UART_NR; i++) { 8999196d8acSJiri Slaby struct uart_8250_port *up = &serial8250_ports[i]; 9009196d8acSJiri Slaby 9019196d8acSJiri Slaby if (up->port.type != PORT_UNKNOWN && up->port.dev == &dev->dev) 9029196d8acSJiri Slaby uart_suspend_port(&serial8250_reg, &up->port); 9039196d8acSJiri Slaby } 9049196d8acSJiri Slaby 9059196d8acSJiri Slaby return 0; 9069196d8acSJiri Slaby } 9079196d8acSJiri Slaby 9089196d8acSJiri Slaby static int serial8250_resume(struct platform_device *dev) 9099196d8acSJiri Slaby { 9109196d8acSJiri Slaby int i; 9119196d8acSJiri Slaby 9129196d8acSJiri Slaby for (i = 0; i < UART_NR; i++) { 9139196d8acSJiri Slaby struct uart_8250_port *up = &serial8250_ports[i]; 9149196d8acSJiri Slaby 9159196d8acSJiri Slaby if (up->port.type != PORT_UNKNOWN && up->port.dev == &dev->dev) 9169196d8acSJiri Slaby serial8250_resume_port(i); 9179196d8acSJiri Slaby } 9189196d8acSJiri Slaby 9199196d8acSJiri Slaby return 0; 9209196d8acSJiri Slaby } 9219196d8acSJiri Slaby 9229196d8acSJiri Slaby static struct platform_driver serial8250_isa_driver = { 9239196d8acSJiri Slaby .probe = serial8250_probe, 9249196d8acSJiri Slaby .remove = serial8250_remove, 9259196d8acSJiri Slaby .suspend = serial8250_suspend, 9269196d8acSJiri Slaby .resume = serial8250_resume, 9279196d8acSJiri Slaby .driver = { 9289196d8acSJiri Slaby .name = "serial8250", 9299196d8acSJiri Slaby }, 9309196d8acSJiri Slaby }; 9319196d8acSJiri Slaby 9329196d8acSJiri Slaby /* 9339196d8acSJiri Slaby * This "device" covers _all_ ISA 8250-compatible serial devices listed 9349196d8acSJiri Slaby * in the table in include/asm/serial.h 9359196d8acSJiri Slaby */ 9369196d8acSJiri Slaby static struct platform_device *serial8250_isa_devs; 9379196d8acSJiri Slaby 9389196d8acSJiri Slaby /* 9399196d8acSJiri Slaby * serial8250_register_8250_port and serial8250_unregister_port allows for 9409196d8acSJiri Slaby * 16x50 serial ports to be configured at run-time, to support PCMCIA 9419196d8acSJiri Slaby * modems and PCI multiport cards. 9429196d8acSJiri Slaby */ 9439196d8acSJiri Slaby static DEFINE_MUTEX(serial_mutex); 9449196d8acSJiri Slaby 945cd256b06SJiri Slaby static struct uart_8250_port *serial8250_find_match_or_unused(const struct uart_port *port) 9469196d8acSJiri Slaby { 9479196d8acSJiri Slaby int i; 9489196d8acSJiri Slaby 9499196d8acSJiri Slaby /* 9509196d8acSJiri Slaby * First, find a port entry which matches. 9519196d8acSJiri Slaby */ 952317a6842SKyle McMartin for (i = 0; i < nr_uarts; i++) 9539196d8acSJiri Slaby if (uart_match_port(&serial8250_ports[i].port, port)) 9549196d8acSJiri Slaby return &serial8250_ports[i]; 9559196d8acSJiri Slaby 95659b3e898SSebastian Andrzej Siewior /* try line number first if still available */ 95759b3e898SSebastian Andrzej Siewior i = port->line; 95859b3e898SSebastian Andrzej Siewior if (i < nr_uarts && serial8250_ports[i].port.type == PORT_UNKNOWN && 95959b3e898SSebastian Andrzej Siewior serial8250_ports[i].port.iobase == 0) 96059b3e898SSebastian Andrzej Siewior return &serial8250_ports[i]; 9619196d8acSJiri Slaby /* 9629196d8acSJiri Slaby * We didn't find a matching entry, so look for the first 9639196d8acSJiri Slaby * free entry. We look for one which hasn't been previously 9649196d8acSJiri Slaby * used (indicated by zero iobase). 9659196d8acSJiri Slaby */ 966317a6842SKyle McMartin for (i = 0; i < nr_uarts; i++) 9679196d8acSJiri Slaby if (serial8250_ports[i].port.type == PORT_UNKNOWN && 9689196d8acSJiri Slaby serial8250_ports[i].port.iobase == 0) 9699196d8acSJiri Slaby return &serial8250_ports[i]; 9709196d8acSJiri Slaby 9719196d8acSJiri Slaby /* 9729196d8acSJiri Slaby * That also failed. Last resort is to find any entry which 9739196d8acSJiri Slaby * doesn't have a real port associated with it. 9749196d8acSJiri Slaby */ 975317a6842SKyle McMartin for (i = 0; i < nr_uarts; i++) 9769196d8acSJiri Slaby if (serial8250_ports[i].port.type == PORT_UNKNOWN) 9779196d8acSJiri Slaby return &serial8250_ports[i]; 9789196d8acSJiri Slaby 9799196d8acSJiri Slaby return NULL; 9809196d8acSJiri Slaby } 9819196d8acSJiri Slaby 9826d7f677aSDarwin Dingel static void serial_8250_overrun_backoff_work(struct work_struct *work) 9836d7f677aSDarwin Dingel { 9846d7f677aSDarwin Dingel struct uart_8250_port *up = 9856d7f677aSDarwin Dingel container_of(to_delayed_work(work), struct uart_8250_port, 9866d7f677aSDarwin Dingel overrun_backoff); 9876d7f677aSDarwin Dingel struct uart_port *port = &up->port; 9886d7f677aSDarwin Dingel unsigned long flags; 9896d7f677aSDarwin Dingel 9906d7f677aSDarwin Dingel spin_lock_irqsave(&port->lock, flags); 9916d7f677aSDarwin Dingel up->ier |= UART_IER_RLSI | UART_IER_RDI; 9926d7f677aSDarwin Dingel up->port.read_status_mask |= UART_LSR_DR; 9936d7f677aSDarwin Dingel serial_out(up, UART_IER, up->ier); 9946d7f677aSDarwin Dingel spin_unlock_irqrestore(&port->lock, flags); 9956d7f677aSDarwin Dingel } 9966d7f677aSDarwin Dingel 9979196d8acSJiri Slaby /** 9989196d8acSJiri Slaby * serial8250_register_8250_port - register a serial port 9999196d8acSJiri Slaby * @up: serial port template 10009196d8acSJiri Slaby * 10019196d8acSJiri Slaby * Configure the serial port specified by the request. If the 10029196d8acSJiri Slaby * port exists and is in use, it is hung up and unregistered 10039196d8acSJiri Slaby * first. 10049196d8acSJiri Slaby * 10059196d8acSJiri Slaby * The port is then probed and if necessary the IRQ is autodetected 10069196d8acSJiri Slaby * If this fails an error is returned. 10079196d8acSJiri Slaby * 10089196d8acSJiri Slaby * On success the port is ready to use and the line number is returned. 10099196d8acSJiri Slaby */ 1010cd256b06SJiri Slaby int serial8250_register_8250_port(const struct uart_8250_port *up) 10119196d8acSJiri Slaby { 10129196d8acSJiri Slaby struct uart_8250_port *uart; 10139196d8acSJiri Slaby int ret = -ENOSPC; 10149196d8acSJiri Slaby 10159196d8acSJiri Slaby if (up->port.uartclk == 0) 10169196d8acSJiri Slaby return -EINVAL; 10179196d8acSJiri Slaby 10189196d8acSJiri Slaby mutex_lock(&serial_mutex); 10199196d8acSJiri Slaby 10209196d8acSJiri Slaby uart = serial8250_find_match_or_unused(&up->port); 1021*9d86719fSTony Lindgren if (!uart) { 1022*9d86719fSTony Lindgren /* 1023*9d86719fSTony Lindgren * If the port is past the initial isa ports, initialize a new 1024*9d86719fSTony Lindgren * port and increment nr_uarts accordingly. 1025*9d86719fSTony Lindgren */ 1026*9d86719fSTony Lindgren uart = serial8250_setup_port(nr_uarts); 1027*9d86719fSTony Lindgren if (!uart) 1028*9d86719fSTony Lindgren goto unlock; 1029*9d86719fSTony Lindgren nr_uarts++; 1030*9d86719fSTony Lindgren } 1031*9d86719fSTony Lindgren 1032*9d86719fSTony Lindgren if (uart->port.type != PORT_8250_CIR) { 10334a96895fSYegor Yefremov struct mctrl_gpios *gpios; 10344a96895fSYegor Yefremov 10359196d8acSJiri Slaby if (uart->port.dev) 10369196d8acSJiri Slaby uart_remove_one_port(&serial8250_reg, &uart->port); 10379196d8acSJiri Slaby 10389196d8acSJiri Slaby uart->port.iobase = up->port.iobase; 10399196d8acSJiri Slaby uart->port.membase = up->port.membase; 10409196d8acSJiri Slaby uart->port.irq = up->port.irq; 10419196d8acSJiri Slaby uart->port.irqflags = up->port.irqflags; 10429196d8acSJiri Slaby uart->port.uartclk = up->port.uartclk; 10439196d8acSJiri Slaby uart->port.fifosize = up->port.fifosize; 10449196d8acSJiri Slaby uart->port.regshift = up->port.regshift; 10459196d8acSJiri Slaby uart->port.iotype = up->port.iotype; 10469196d8acSJiri Slaby uart->port.flags = up->port.flags | UPF_BOOT_AUTOCONF; 10479196d8acSJiri Slaby uart->bugs = up->bugs; 10489196d8acSJiri Slaby uart->port.mapbase = up->port.mapbase; 1049ee97d0e3SMans Rullgard uart->port.mapsize = up->port.mapsize; 10509196d8acSJiri Slaby uart->port.private_data = up->port.private_data; 10519196d8acSJiri Slaby uart->tx_loadsz = up->tx_loadsz; 10529196d8acSJiri Slaby uart->capabilities = up->capabilities; 1053234abab1SSebastian Andrzej Siewior uart->port.throttle = up->port.throttle; 1054234abab1SSebastian Andrzej Siewior uart->port.unthrottle = up->port.unthrottle; 105546c55b4bSRicardo Ribalda Delgado uart->port.rs485_config = up->port.rs485_config; 10568925c31cSIlpo Järvinen uart->port.rs485_supported = up->port.rs485_supported; 105746c55b4bSRicardo Ribalda Delgado uart->port.rs485 = up->port.rs485; 1058058bc104SLukas Wunner uart->rs485_start_tx = up->rs485_start_tx; 1059058bc104SLukas Wunner uart->rs485_stop_tx = up->rs485_stop_tx; 1060507bd6fbSIlpo Järvinen uart->lsr_save_mask = up->lsr_save_mask; 1061d53e1428SPeter Hurley uart->dma = up->dma; 10629196d8acSJiri Slaby 1063ef99f3aeSGreg Kroah-Hartman /* Take tx_loadsz from fifosize if it wasn't set separately */ 1064ef99f3aeSGreg Kroah-Hartman if (uart->port.fifosize && !uart->tx_loadsz) 1065ef99f3aeSGreg Kroah-Hartman uart->tx_loadsz = uart->port.fifosize; 1066ef99f3aeSGreg Kroah-Hartman 1067fe7f0fa4SLukas Wunner if (up->port.dev) { 10689196d8acSJiri Slaby uart->port.dev = up->port.dev; 1069c150c0f3SLukas Wunner ret = uart_get_rs485_mode(&uart->port); 1070c150c0f3SLukas Wunner if (ret) 1071c150c0f3SLukas Wunner goto err; 1072fe7f0fa4SLukas Wunner } 10739196d8acSJiri Slaby 10749196d8acSJiri Slaby if (up->port.flags & UPF_FIXED_TYPE) 1075afd483bdSPeter Hurley uart->port.type = up->port.type; 10769196d8acSJiri Slaby 10774a96895fSYegor Yefremov /* 10784a96895fSYegor Yefremov * Only call mctrl_gpio_init(), if the device has no ACPI 10794a96895fSYegor Yefremov * companion device 10804a96895fSYegor Yefremov */ 10814a96895fSYegor Yefremov if (!has_acpi_companion(uart->port.dev)) { 10824a96895fSYegor Yefremov gpios = mctrl_gpio_init(&uart->port, 0); 10834a96895fSYegor Yefremov if (IS_ERR(gpios)) { 1084b7a8f766SWei Yongjun ret = PTR_ERR(gpios); 1085e0a851feSLukas Wunner goto err; 10864a96895fSYegor Yefremov } else { 10874a96895fSYegor Yefremov uart->gpios = gpios; 10884a96895fSYegor Yefremov } 10894a96895fSYegor Yefremov } 10904a96895fSYegor Yefremov 10911a53e079SPeter Hurley serial8250_set_defaults(uart); 10921a53e079SPeter Hurley 10939196d8acSJiri Slaby /* Possibly override default I/O functions. */ 10949196d8acSJiri Slaby if (up->port.serial_in) 10959196d8acSJiri Slaby uart->port.serial_in = up->port.serial_in; 10969196d8acSJiri Slaby if (up->port.serial_out) 10979196d8acSJiri Slaby uart->port.serial_out = up->port.serial_out; 10989196d8acSJiri Slaby if (up->port.handle_irq) 10999196d8acSJiri Slaby uart->port.handle_irq = up->port.handle_irq; 11009196d8acSJiri Slaby /* Possibly override set_termios call */ 11019196d8acSJiri Slaby if (up->port.set_termios) 11029196d8acSJiri Slaby uart->port.set_termios = up->port.set_termios; 1103db405a8fSEd Blake if (up->port.set_ldisc) 1104db405a8fSEd Blake uart->port.set_ldisc = up->port.set_ldisc; 1105144ef5c2SWan Ahmad Zainie if (up->port.get_mctrl) 1106144ef5c2SWan Ahmad Zainie uart->port.get_mctrl = up->port.get_mctrl; 11074bf4ea9dSPeter Hurley if (up->port.set_mctrl) 11084bf4ea9dSPeter Hurley uart->port.set_mctrl = up->port.set_mctrl; 11090238d2b4SJisheng Zhang if (up->port.get_divisor) 11100238d2b4SJisheng Zhang uart->port.get_divisor = up->port.get_divisor; 11110238d2b4SJisheng Zhang if (up->port.set_divisor) 11120238d2b4SJisheng Zhang uart->port.set_divisor = up->port.set_divisor; 1113b99b121bSSebastian Andrzej Siewior if (up->port.startup) 1114b99b121bSSebastian Andrzej Siewior uart->port.startup = up->port.startup; 1115b99b121bSSebastian Andrzej Siewior if (up->port.shutdown) 1116b99b121bSSebastian Andrzej Siewior uart->port.shutdown = up->port.shutdown; 11179196d8acSJiri Slaby if (up->port.pm) 11189196d8acSJiri Slaby uart->port.pm = up->port.pm; 11199196d8acSJiri Slaby if (up->port.handle_break) 11209196d8acSJiri Slaby uart->port.handle_break = up->port.handle_break; 11219196d8acSJiri Slaby if (up->dl_read) 11229196d8acSJiri Slaby uart->dl_read = up->dl_read; 11239196d8acSJiri Slaby if (up->dl_write) 11249196d8acSJiri Slaby uart->dl_write = up->dl_write; 11259196d8acSJiri Slaby 11269527b82aSSean Young if (uart->port.type != PORT_8250_CIR) { 11279196d8acSJiri Slaby if (serial8250_isa_config != NULL) 11289196d8acSJiri Slaby serial8250_isa_config(0, &uart->port, 11299196d8acSJiri Slaby &uart->capabilities); 11309196d8acSJiri Slaby 1131c7ac15ceSAndy Shevchenko serial8250_apply_quirks(uart); 11329527b82aSSean Young ret = uart_add_one_port(&serial8250_reg, 11339527b82aSSean Young &uart->port); 1134e0a851feSLukas Wunner if (ret) 1135e0a851feSLukas Wunner goto err; 1136e0a851feSLukas Wunner 11379196d8acSJiri Slaby ret = uart->port.line; 11389527b82aSSean Young } else { 11399527b82aSSean Young dev_info(uart->port.dev, 11409527b82aSSean Young "skipping CIR port at 0x%lx / 0x%llx, IRQ %d\n", 11419527b82aSSean Young uart->port.iobase, 11429527b82aSSean Young (unsigned long long)uart->port.mapbase, 11439527b82aSSean Young uart->port.irq); 11449527b82aSSean Young 11459527b82aSSean Young ret = 0; 11469527b82aSSean Young } 11476d7f677aSDarwin Dingel 1148507bd6fbSIlpo Järvinen if (!uart->lsr_save_mask) 1149507bd6fbSIlpo Järvinen uart->lsr_save_mask = LSR_SAVE_FLAGS; /* Use default LSR mask */ 1150507bd6fbSIlpo Järvinen 11516d7f677aSDarwin Dingel /* Initialise interrupt backoff work if required */ 11526d7f677aSDarwin Dingel if (up->overrun_backoff_time_ms > 0) { 1153352c4cf4SHe Zhe uart->overrun_backoff_time_ms = 1154352c4cf4SHe Zhe up->overrun_backoff_time_ms; 11556d7f677aSDarwin Dingel INIT_DELAYED_WORK(&uart->overrun_backoff, 11566d7f677aSDarwin Dingel serial_8250_overrun_backoff_work); 11576d7f677aSDarwin Dingel } else { 11586d7f677aSDarwin Dingel uart->overrun_backoff_time_ms = 0; 11596d7f677aSDarwin Dingel } 1160352c4cf4SHe Zhe } 11616d7f677aSDarwin Dingel 1162*9d86719fSTony Lindgren unlock: 11639196d8acSJiri Slaby mutex_unlock(&serial_mutex); 11649196d8acSJiri Slaby 11659196d8acSJiri Slaby return ret; 1166e0a851feSLukas Wunner 1167e0a851feSLukas Wunner err: 1168e0a851feSLukas Wunner uart->port.dev = NULL; 1169e0a851feSLukas Wunner mutex_unlock(&serial_mutex); 1170e0a851feSLukas Wunner return ret; 11719196d8acSJiri Slaby } 11729196d8acSJiri Slaby EXPORT_SYMBOL(serial8250_register_8250_port); 11739196d8acSJiri Slaby 11749196d8acSJiri Slaby /** 11759196d8acSJiri Slaby * serial8250_unregister_port - remove a 16x50 serial port at runtime 11769196d8acSJiri Slaby * @line: serial line number 11779196d8acSJiri Slaby * 11789196d8acSJiri Slaby * Remove one serial port. This may not be called from interrupt 11799196d8acSJiri Slaby * context. We hand the port back to the our control. 11809196d8acSJiri Slaby */ 11819196d8acSJiri Slaby void serial8250_unregister_port(int line) 11829196d8acSJiri Slaby { 11839196d8acSJiri Slaby struct uart_8250_port *uart = &serial8250_ports[line]; 11849196d8acSJiri Slaby 11859196d8acSJiri Slaby mutex_lock(&serial_mutex); 1186bf2a0be4SMatwey V. Kornilov 1187bf2a0be4SMatwey V. Kornilov if (uart->em485) { 1188bf2a0be4SMatwey V. Kornilov unsigned long flags; 1189bf2a0be4SMatwey V. Kornilov 1190bf2a0be4SMatwey V. Kornilov spin_lock_irqsave(&uart->port.lock, flags); 1191bf2a0be4SMatwey V. Kornilov serial8250_em485_destroy(uart); 1192bf2a0be4SMatwey V. Kornilov spin_unlock_irqrestore(&uart->port.lock, flags); 1193bf2a0be4SMatwey V. Kornilov } 1194bf2a0be4SMatwey V. Kornilov 11959196d8acSJiri Slaby uart_remove_one_port(&serial8250_reg, &uart->port); 11969196d8acSJiri Slaby if (serial8250_isa_devs) { 11979196d8acSJiri Slaby uart->port.flags &= ~UPF_BOOT_AUTOCONF; 11989196d8acSJiri Slaby uart->port.type = PORT_UNKNOWN; 11999196d8acSJiri Slaby uart->port.dev = &serial8250_isa_devs->dev; 12005db496b9SPeter Hurley uart->capabilities = 0; 120104e82793STony Lindgren serial8250_init_port(uart); 1202c7ac15ceSAndy Shevchenko serial8250_apply_quirks(uart); 12039196d8acSJiri Slaby uart_add_one_port(&serial8250_reg, &uart->port); 12049196d8acSJiri Slaby } else { 12059196d8acSJiri Slaby uart->port.dev = NULL; 12069196d8acSJiri Slaby } 12079196d8acSJiri Slaby mutex_unlock(&serial_mutex); 12089196d8acSJiri Slaby } 12099196d8acSJiri Slaby EXPORT_SYMBOL(serial8250_unregister_port); 12109196d8acSJiri Slaby 12119196d8acSJiri Slaby static int __init serial8250_init(void) 12129196d8acSJiri Slaby { 12139196d8acSJiri Slaby int ret; 12149196d8acSJiri Slaby 121559cfc45fSJan Kiszka if (nr_uarts == 0) 121659cfc45fSJan Kiszka return -ENODEV; 121759cfc45fSJan Kiszka 12189196d8acSJiri Slaby serial8250_isa_init_ports(); 12199196d8acSJiri Slaby 12202cfc64f3SAndy Shevchenko pr_info("Serial: 8250/16550 driver, %d ports, IRQ sharing %s\n", 12212cfc64f3SAndy Shevchenko nr_uarts, str_enabled_disabled(share_irqs)); 12229196d8acSJiri Slaby 12239196d8acSJiri Slaby #ifdef CONFIG_SPARC 12249196d8acSJiri Slaby ret = sunserial_register_minors(&serial8250_reg, UART_NR); 12259196d8acSJiri Slaby #else 12269196d8acSJiri Slaby serial8250_reg.nr = UART_NR; 12279196d8acSJiri Slaby ret = uart_register_driver(&serial8250_reg); 12289196d8acSJiri Slaby #endif 12299196d8acSJiri Slaby if (ret) 12309196d8acSJiri Slaby goto out; 12319196d8acSJiri Slaby 12329196d8acSJiri Slaby ret = serial8250_pnp_init(); 12339196d8acSJiri Slaby if (ret) 12349196d8acSJiri Slaby goto unreg_uart_drv; 12359196d8acSJiri Slaby 12369196d8acSJiri Slaby serial8250_isa_devs = platform_device_alloc("serial8250", 12379196d8acSJiri Slaby PLAT8250_DEV_LEGACY); 12389196d8acSJiri Slaby if (!serial8250_isa_devs) { 12399196d8acSJiri Slaby ret = -ENOMEM; 12409196d8acSJiri Slaby goto unreg_pnp; 12419196d8acSJiri Slaby } 12429196d8acSJiri Slaby 12439196d8acSJiri Slaby ret = platform_device_add(serial8250_isa_devs); 12449196d8acSJiri Slaby if (ret) 12459196d8acSJiri Slaby goto put_dev; 12469196d8acSJiri Slaby 12479196d8acSJiri Slaby serial8250_register_ports(&serial8250_reg, &serial8250_isa_devs->dev); 12489196d8acSJiri Slaby 12499196d8acSJiri Slaby ret = platform_driver_register(&serial8250_isa_driver); 12509196d8acSJiri Slaby if (ret == 0) 12519196d8acSJiri Slaby goto out; 12529196d8acSJiri Slaby 12539196d8acSJiri Slaby platform_device_del(serial8250_isa_devs); 12549196d8acSJiri Slaby put_dev: 12559196d8acSJiri Slaby platform_device_put(serial8250_isa_devs); 12569196d8acSJiri Slaby unreg_pnp: 12579196d8acSJiri Slaby serial8250_pnp_exit(); 12589196d8acSJiri Slaby unreg_uart_drv: 12599196d8acSJiri Slaby #ifdef CONFIG_SPARC 12609196d8acSJiri Slaby sunserial_unregister_minors(&serial8250_reg, UART_NR); 12619196d8acSJiri Slaby #else 12629196d8acSJiri Slaby uart_unregister_driver(&serial8250_reg); 12639196d8acSJiri Slaby #endif 12649196d8acSJiri Slaby out: 12659196d8acSJiri Slaby return ret; 12669196d8acSJiri Slaby } 12679196d8acSJiri Slaby 12689196d8acSJiri Slaby static void __exit serial8250_exit(void) 12699196d8acSJiri Slaby { 12709196d8acSJiri Slaby struct platform_device *isa_dev = serial8250_isa_devs; 12719196d8acSJiri Slaby 12729196d8acSJiri Slaby /* 12739196d8acSJiri Slaby * This tells serial8250_unregister_port() not to re-register 12749196d8acSJiri Slaby * the ports (thereby making serial8250_isa_driver permanently 12759196d8acSJiri Slaby * in use.) 12769196d8acSJiri Slaby */ 12779196d8acSJiri Slaby serial8250_isa_devs = NULL; 12789196d8acSJiri Slaby 12799196d8acSJiri Slaby platform_driver_unregister(&serial8250_isa_driver); 12809196d8acSJiri Slaby platform_device_unregister(isa_dev); 12819196d8acSJiri Slaby 12829196d8acSJiri Slaby serial8250_pnp_exit(); 12839196d8acSJiri Slaby 12849196d8acSJiri Slaby #ifdef CONFIG_SPARC 12859196d8acSJiri Slaby sunserial_unregister_minors(&serial8250_reg, UART_NR); 12869196d8acSJiri Slaby #else 12879196d8acSJiri Slaby uart_unregister_driver(&serial8250_reg); 12889196d8acSJiri Slaby #endif 12899196d8acSJiri Slaby } 12909196d8acSJiri Slaby 12919196d8acSJiri Slaby module_init(serial8250_init); 12929196d8acSJiri Slaby module_exit(serial8250_exit); 12939196d8acSJiri Slaby 12949196d8acSJiri Slaby MODULE_LICENSE("GPL"); 12959196d8acSJiri Slaby MODULE_DESCRIPTION("Generic 8250/16x50 serial driver"); 12969196d8acSJiri Slaby 12973b60daf8SDavid Howells module_param_hw(share_irqs, uint, other, 0644); 129890ad7c44SAnton Wuerfel MODULE_PARM_DESC(share_irqs, "Share IRQs with other non-8250/16x50 devices (unsafe)"); 12999196d8acSJiri Slaby 13009196d8acSJiri Slaby module_param(nr_uarts, uint, 0644); 13019196d8acSJiri Slaby MODULE_PARM_DESC(nr_uarts, "Maximum number of UARTs supported. (1-" __MODULE_STRING(CONFIG_SERIAL_8250_NR_UARTS) ")"); 13029196d8acSJiri Slaby 13039196d8acSJiri Slaby module_param(skip_txen_test, uint, 0644); 13049196d8acSJiri Slaby MODULE_PARM_DESC(skip_txen_test, "Skip checking for the TXEN bug at init time"); 13059196d8acSJiri Slaby 13069196d8acSJiri Slaby #ifdef CONFIG_SERIAL_8250_RSA 13073b60daf8SDavid Howells module_param_hw_array(probe_rsa, ulong, ioport, &probe_rsa_count, 0444); 13089196d8acSJiri Slaby MODULE_PARM_DESC(probe_rsa, "Probe I/O ports for RSA"); 13099196d8acSJiri Slaby #endif 13109196d8acSJiri Slaby MODULE_ALIAS_CHARDEV_MAJOR(TTY_MAJOR); 13119196d8acSJiri Slaby 13129326b047SJiri Slaby #ifdef CONFIG_SERIAL_8250_DEPRECATED_OPTIONS 13139196d8acSJiri Slaby #ifndef MODULE 13149196d8acSJiri Slaby /* This module was renamed to 8250_core in 3.7. Keep the old "8250" name 13159196d8acSJiri Slaby * working as well for the module options so we don't break people. We 13169196d8acSJiri Slaby * need to keep the names identical and the convenient macros will happily 13179196d8acSJiri Slaby * refuse to let us do that by failing the build with redefinition errors 13189196d8acSJiri Slaby * of global variables. So we stick them inside a dummy function to avoid 13199196d8acSJiri Slaby * those conflicts. The options still get parsed, and the redefined 13209196d8acSJiri Slaby * MODULE_PARAM_PREFIX lets us keep the "8250." syntax alive. 13219196d8acSJiri Slaby * 13229196d8acSJiri Slaby * This is hacky. I'm sorry. 13239196d8acSJiri Slaby */ 13249196d8acSJiri Slaby static void __used s8250_options(void) 13259196d8acSJiri Slaby { 13269196d8acSJiri Slaby #undef MODULE_PARAM_PREFIX 13279196d8acSJiri Slaby #define MODULE_PARAM_PREFIX "8250_core." 13289196d8acSJiri Slaby 13299196d8acSJiri Slaby module_param_cb(share_irqs, ¶m_ops_uint, &share_irqs, 0644); 13309196d8acSJiri Slaby module_param_cb(nr_uarts, ¶m_ops_uint, &nr_uarts, 0644); 13319196d8acSJiri Slaby module_param_cb(skip_txen_test, ¶m_ops_uint, &skip_txen_test, 0644); 13329196d8acSJiri Slaby #ifdef CONFIG_SERIAL_8250_RSA 13339196d8acSJiri Slaby __module_param_call(MODULE_PARAM_PREFIX, probe_rsa, 13349196d8acSJiri Slaby ¶m_array_ops, .arr = &__param_arr_probe_rsa, 133591f9d330SJani Nikula 0444, -1, 0); 13369196d8acSJiri Slaby #endif 13379196d8acSJiri Slaby } 13389196d8acSJiri Slaby #else 13399196d8acSJiri Slaby MODULE_ALIAS("8250_core"); 13409196d8acSJiri Slaby #endif 13419326b047SJiri Slaby #endif 1342