19196d8acSJiri Slaby /* 2b6830f6dSPeter Hurley * Universal/legacy 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 * 8b6830f6dSPeter Hurley * Supports: ISA-compatible 8250/16550 ports 9b6830f6dSPeter Hurley * PNP 8250/16550 ports 10b6830f6dSPeter Hurley * early_serial_setup() ports 11b6830f6dSPeter Hurley * userspace-configurable "phantom" ports 12b6830f6dSPeter Hurley * "serial8250" platform devices 13b6830f6dSPeter Hurley * serial8250_register_8250_port() ports 14b6830f6dSPeter Hurley * 159196d8acSJiri Slaby * This program is free software; you can redistribute it and/or modify 169196d8acSJiri Slaby * it under the terms of the GNU General Public License as published by 179196d8acSJiri Slaby * the Free Software Foundation; either version 2 of the License, or 189196d8acSJiri Slaby * (at your option) any later version. 199196d8acSJiri Slaby */ 209196d8acSJiri Slaby 219196d8acSJiri Slaby #include <linux/module.h> 229196d8acSJiri Slaby #include <linux/moduleparam.h> 239196d8acSJiri Slaby #include <linux/ioport.h> 249196d8acSJiri Slaby #include <linux/init.h> 259196d8acSJiri Slaby #include <linux/console.h> 269196d8acSJiri Slaby #include <linux/sysrq.h> 279196d8acSJiri Slaby #include <linux/delay.h> 289196d8acSJiri Slaby #include <linux/platform_device.h> 299196d8acSJiri Slaby #include <linux/tty.h> 309196d8acSJiri Slaby #include <linux/ratelimit.h> 319196d8acSJiri Slaby #include <linux/tty_flip.h> 329196d8acSJiri Slaby #include <linux/serial.h> 339196d8acSJiri Slaby #include <linux/serial_8250.h> 349196d8acSJiri Slaby #include <linux/nmi.h> 359196d8acSJiri Slaby #include <linux/mutex.h> 369196d8acSJiri Slaby #include <linux/slab.h> 370b4af1d9SRicardo Ribalda Delgado #include <linux/uaccess.h> 38d74d5d1bSSebastian Andrzej Siewior #include <linux/pm_runtime.h> 392584cf83SDan Williams #include <linux/io.h> 409196d8acSJiri Slaby #ifdef CONFIG_SPARC 419196d8acSJiri Slaby #include <linux/sunserialcore.h> 429196d8acSJiri Slaby #endif 439196d8acSJiri Slaby 449196d8acSJiri Slaby #include <asm/irq.h> 459196d8acSJiri Slaby 469196d8acSJiri Slaby #include "8250.h" 479196d8acSJiri Slaby 489196d8acSJiri Slaby /* 499196d8acSJiri Slaby * Configuration: 509196d8acSJiri Slaby * share_irqs - whether we pass IRQF_SHARED to request_irq(). This option 519196d8acSJiri Slaby * is unsafe when used on edge-triggered interrupts. 529196d8acSJiri Slaby */ 539196d8acSJiri Slaby static unsigned int share_irqs = SERIAL8250_SHARE_IRQS; 549196d8acSJiri Slaby 559196d8acSJiri Slaby static unsigned int nr_uarts = CONFIG_SERIAL_8250_RUNTIME_UARTS; 569196d8acSJiri Slaby 579196d8acSJiri Slaby static struct uart_driver serial8250_reg; 589196d8acSJiri Slaby 599196d8acSJiri Slaby static unsigned int skip_txen_test; /* force skip of txen test at init time */ 609196d8acSJiri Slaby 619196d8acSJiri Slaby #define PASS_LIMIT 512 629196d8acSJiri Slaby 639196d8acSJiri Slaby #include <asm/serial.h> 649196d8acSJiri Slaby /* 659196d8acSJiri Slaby * SERIAL_PORT_DFNS tells us about built-in ports that have no 669196d8acSJiri Slaby * standard enumeration mechanism. Platforms that can find all 679196d8acSJiri Slaby * serial ports via mechanisms like ACPI or PCI need not supply it. 689196d8acSJiri Slaby */ 699196d8acSJiri Slaby #ifndef SERIAL_PORT_DFNS 709196d8acSJiri Slaby #define SERIAL_PORT_DFNS 719196d8acSJiri Slaby #endif 729196d8acSJiri Slaby 739196d8acSJiri Slaby static const struct old_serial_port old_serial_port[] = { 749196d8acSJiri Slaby SERIAL_PORT_DFNS /* defined in asm/serial.h */ 759196d8acSJiri Slaby }; 769196d8acSJiri Slaby 779196d8acSJiri Slaby #define UART_NR CONFIG_SERIAL_8250_NR_UARTS 789196d8acSJiri Slaby 799196d8acSJiri Slaby #ifdef CONFIG_SERIAL_8250_RSA 809196d8acSJiri Slaby 819196d8acSJiri Slaby #define PORT_RSA_MAX 4 829196d8acSJiri Slaby static unsigned long probe_rsa[PORT_RSA_MAX]; 839196d8acSJiri Slaby static unsigned int probe_rsa_count; 849196d8acSJiri Slaby #endif /* CONFIG_SERIAL_8250_RSA */ 859196d8acSJiri Slaby 869196d8acSJiri Slaby struct irq_info { 879196d8acSJiri Slaby struct hlist_node node; 889196d8acSJiri Slaby int irq; 899196d8acSJiri Slaby spinlock_t lock; /* Protects list not the hash */ 909196d8acSJiri Slaby struct list_head *head; 919196d8acSJiri Slaby }; 929196d8acSJiri Slaby 939196d8acSJiri Slaby #define NR_IRQ_HASH 32 /* Can be adjusted later */ 949196d8acSJiri Slaby static struct hlist_head irq_lists[NR_IRQ_HASH]; 959196d8acSJiri Slaby static DEFINE_MUTEX(hash_mutex); /* Used to walk the hash */ 969196d8acSJiri Slaby 979196d8acSJiri Slaby /* 989196d8acSJiri Slaby * This is the serial driver's interrupt routine. 999196d8acSJiri Slaby * 1009196d8acSJiri Slaby * Arjan thinks the old way was overly complex, so it got simplified. 1019196d8acSJiri Slaby * Alan disagrees, saying that need the complexity to handle the weird 1029196d8acSJiri Slaby * nature of ISA shared interrupts. (This is a special exception.) 1039196d8acSJiri Slaby * 1049196d8acSJiri Slaby * In order to handle ISA shared interrupts properly, we need to check 1059196d8acSJiri Slaby * that all ports have been serviced, and therefore the ISA interrupt 1069196d8acSJiri Slaby * line has been de-asserted. 1079196d8acSJiri Slaby * 1089196d8acSJiri Slaby * This means we need to loop through all ports. checking that they 1099196d8acSJiri Slaby * don't have an interrupt pending. 1109196d8acSJiri Slaby */ 1119196d8acSJiri Slaby static irqreturn_t serial8250_interrupt(int irq, void *dev_id) 1129196d8acSJiri Slaby { 1139196d8acSJiri Slaby struct irq_info *i = dev_id; 1149196d8acSJiri Slaby struct list_head *l, *end = NULL; 1159196d8acSJiri Slaby int pass_counter = 0, handled = 0; 1169196d8acSJiri Slaby 1179196d8acSJiri Slaby DEBUG_INTR("serial8250_interrupt(%d)...", irq); 1189196d8acSJiri Slaby 1199196d8acSJiri Slaby spin_lock(&i->lock); 1209196d8acSJiri Slaby 1219196d8acSJiri Slaby l = i->head; 1229196d8acSJiri Slaby do { 1239196d8acSJiri Slaby struct uart_8250_port *up; 1249196d8acSJiri Slaby struct uart_port *port; 1259196d8acSJiri Slaby 1269196d8acSJiri Slaby up = list_entry(l, struct uart_8250_port, list); 1279196d8acSJiri Slaby port = &up->port; 1289196d8acSJiri Slaby 1299196d8acSJiri Slaby if (port->handle_irq(port)) { 1309196d8acSJiri Slaby handled = 1; 1319196d8acSJiri Slaby end = NULL; 1329196d8acSJiri Slaby } else if (end == NULL) 1339196d8acSJiri Slaby end = l; 1349196d8acSJiri Slaby 1359196d8acSJiri Slaby l = l->next; 1369196d8acSJiri Slaby 1379196d8acSJiri Slaby if (l == i->head && pass_counter++ > PASS_LIMIT) { 1389196d8acSJiri Slaby /* If we hit this, we're dead. */ 1399196d8acSJiri Slaby printk_ratelimited(KERN_ERR 1409196d8acSJiri Slaby "serial8250: too much work for irq%d\n", irq); 1419196d8acSJiri Slaby break; 1429196d8acSJiri Slaby } 1439196d8acSJiri Slaby } while (l != end); 1449196d8acSJiri Slaby 1459196d8acSJiri Slaby spin_unlock(&i->lock); 1469196d8acSJiri Slaby 1479196d8acSJiri Slaby DEBUG_INTR("end.\n"); 1489196d8acSJiri Slaby 1499196d8acSJiri Slaby return IRQ_RETVAL(handled); 1509196d8acSJiri Slaby } 1519196d8acSJiri Slaby 1529196d8acSJiri Slaby /* 1539196d8acSJiri Slaby * To support ISA shared interrupts, we need to have one interrupt 1549196d8acSJiri Slaby * handler that ensures that the IRQ line has been deasserted 1559196d8acSJiri Slaby * before returning. Failing to do this will result in the IRQ 1569196d8acSJiri Slaby * line being stuck active, and, since ISA irqs are edge triggered, 1579196d8acSJiri Slaby * no more IRQs will be seen. 1589196d8acSJiri Slaby */ 1599196d8acSJiri Slaby static void serial_do_unlink(struct irq_info *i, struct uart_8250_port *up) 1609196d8acSJiri Slaby { 1619196d8acSJiri Slaby spin_lock_irq(&i->lock); 1629196d8acSJiri Slaby 1639196d8acSJiri Slaby if (!list_empty(i->head)) { 1649196d8acSJiri Slaby if (i->head == &up->list) 1659196d8acSJiri Slaby i->head = i->head->next; 1669196d8acSJiri Slaby list_del(&up->list); 1679196d8acSJiri Slaby } else { 1689196d8acSJiri Slaby BUG_ON(i->head != &up->list); 1699196d8acSJiri Slaby i->head = NULL; 1709196d8acSJiri Slaby } 1719196d8acSJiri Slaby spin_unlock_irq(&i->lock); 1729196d8acSJiri Slaby /* List empty so throw away the hash node */ 1739196d8acSJiri Slaby if (i->head == NULL) { 1749196d8acSJiri Slaby hlist_del(&i->node); 1759196d8acSJiri Slaby kfree(i); 1769196d8acSJiri Slaby } 1779196d8acSJiri Slaby } 1789196d8acSJiri Slaby 1799196d8acSJiri Slaby static int serial_link_irq_chain(struct uart_8250_port *up) 1809196d8acSJiri Slaby { 1819196d8acSJiri Slaby struct hlist_head *h; 1829196d8acSJiri Slaby struct hlist_node *n; 1839196d8acSJiri Slaby struct irq_info *i; 1849196d8acSJiri Slaby int ret, irq_flags = up->port.flags & UPF_SHARE_IRQ ? IRQF_SHARED : 0; 1859196d8acSJiri Slaby 1869196d8acSJiri Slaby mutex_lock(&hash_mutex); 1879196d8acSJiri Slaby 1889196d8acSJiri Slaby h = &irq_lists[up->port.irq % NR_IRQ_HASH]; 1899196d8acSJiri Slaby 1909196d8acSJiri Slaby hlist_for_each(n, h) { 1919196d8acSJiri Slaby i = hlist_entry(n, struct irq_info, node); 1929196d8acSJiri Slaby if (i->irq == up->port.irq) 1939196d8acSJiri Slaby break; 1949196d8acSJiri Slaby } 1959196d8acSJiri Slaby 1969196d8acSJiri Slaby if (n == NULL) { 1979196d8acSJiri Slaby i = kzalloc(sizeof(struct irq_info), GFP_KERNEL); 1989196d8acSJiri Slaby if (i == NULL) { 1999196d8acSJiri Slaby mutex_unlock(&hash_mutex); 2009196d8acSJiri Slaby return -ENOMEM; 2019196d8acSJiri Slaby } 2029196d8acSJiri Slaby spin_lock_init(&i->lock); 2039196d8acSJiri Slaby i->irq = up->port.irq; 2049196d8acSJiri Slaby hlist_add_head(&i->node, h); 2059196d8acSJiri Slaby } 2069196d8acSJiri Slaby mutex_unlock(&hash_mutex); 2079196d8acSJiri Slaby 2089196d8acSJiri Slaby spin_lock_irq(&i->lock); 2099196d8acSJiri Slaby 2109196d8acSJiri Slaby if (i->head) { 2119196d8acSJiri Slaby list_add(&up->list, i->head); 2129196d8acSJiri Slaby spin_unlock_irq(&i->lock); 2139196d8acSJiri Slaby 2149196d8acSJiri Slaby ret = 0; 2159196d8acSJiri Slaby } else { 2169196d8acSJiri Slaby INIT_LIST_HEAD(&up->list); 2179196d8acSJiri Slaby i->head = &up->list; 2189196d8acSJiri Slaby spin_unlock_irq(&i->lock); 2199196d8acSJiri Slaby irq_flags |= up->port.irqflags; 2209196d8acSJiri Slaby ret = request_irq(up->port.irq, serial8250_interrupt, 2219196d8acSJiri Slaby irq_flags, "serial", i); 2229196d8acSJiri Slaby if (ret < 0) 2239196d8acSJiri Slaby serial_do_unlink(i, up); 2249196d8acSJiri Slaby } 2259196d8acSJiri Slaby 2269196d8acSJiri Slaby return ret; 2279196d8acSJiri Slaby } 2289196d8acSJiri Slaby 2299196d8acSJiri Slaby static void serial_unlink_irq_chain(struct uart_8250_port *up) 2309196d8acSJiri Slaby { 231bd2fe272SPaul Gortmaker /* 232bd2fe272SPaul Gortmaker * yes, some broken gcc emit "warning: 'i' may be used uninitialized" 233bd2fe272SPaul Gortmaker * but no, we are not going to take a patch that assigns NULL below. 234bd2fe272SPaul Gortmaker */ 2359196d8acSJiri Slaby struct irq_info *i; 2369196d8acSJiri Slaby struct hlist_node *n; 2379196d8acSJiri Slaby struct hlist_head *h; 2389196d8acSJiri Slaby 2399196d8acSJiri Slaby mutex_lock(&hash_mutex); 2409196d8acSJiri Slaby 2419196d8acSJiri Slaby h = &irq_lists[up->port.irq % NR_IRQ_HASH]; 2429196d8acSJiri Slaby 2439196d8acSJiri Slaby hlist_for_each(n, h) { 2449196d8acSJiri Slaby i = hlist_entry(n, struct irq_info, node); 2459196d8acSJiri Slaby if (i->irq == up->port.irq) 2469196d8acSJiri Slaby break; 2479196d8acSJiri Slaby } 2489196d8acSJiri Slaby 2499196d8acSJiri Slaby BUG_ON(n == NULL); 2509196d8acSJiri Slaby BUG_ON(i->head == NULL); 2519196d8acSJiri Slaby 2529196d8acSJiri Slaby if (list_empty(i->head)) 2539196d8acSJiri Slaby free_irq(up->port.irq, i); 2549196d8acSJiri Slaby 2559196d8acSJiri Slaby serial_do_unlink(i, up); 2569196d8acSJiri Slaby mutex_unlock(&hash_mutex); 2579196d8acSJiri Slaby } 2589196d8acSJiri Slaby 2599196d8acSJiri Slaby /* 2609196d8acSJiri Slaby * This function is used to handle ports that do not have an 2619196d8acSJiri Slaby * interrupt. This doesn't work very well for 16450's, but gives 2629196d8acSJiri Slaby * barely passable results for a 16550A. (Although at the expense 2639196d8acSJiri Slaby * of much CPU overhead). 2649196d8acSJiri Slaby */ 2659196d8acSJiri Slaby static void serial8250_timeout(unsigned long data) 2669196d8acSJiri Slaby { 2679196d8acSJiri Slaby struct uart_8250_port *up = (struct uart_8250_port *)data; 2689196d8acSJiri Slaby 2699196d8acSJiri Slaby up->port.handle_irq(&up->port); 2709196d8acSJiri Slaby mod_timer(&up->timer, jiffies + uart_poll_timeout(&up->port)); 2719196d8acSJiri Slaby } 2729196d8acSJiri Slaby 2739196d8acSJiri Slaby static void serial8250_backup_timeout(unsigned long data) 2749196d8acSJiri Slaby { 2759196d8acSJiri Slaby struct uart_8250_port *up = (struct uart_8250_port *)data; 2769196d8acSJiri Slaby unsigned int iir, ier = 0, lsr; 2779196d8acSJiri Slaby unsigned long flags; 2789196d8acSJiri Slaby 2799196d8acSJiri Slaby spin_lock_irqsave(&up->port.lock, flags); 2809196d8acSJiri Slaby 2819196d8acSJiri Slaby /* 2829196d8acSJiri Slaby * Must disable interrupts or else we risk racing with the interrupt 2839196d8acSJiri Slaby * based handler. 2849196d8acSJiri Slaby */ 2859196d8acSJiri Slaby if (up->port.irq) { 2869196d8acSJiri Slaby ier = serial_in(up, UART_IER); 2879196d8acSJiri Slaby serial_out(up, UART_IER, 0); 2889196d8acSJiri Slaby } 2899196d8acSJiri Slaby 2909196d8acSJiri Slaby iir = serial_in(up, UART_IIR); 2919196d8acSJiri Slaby 2929196d8acSJiri Slaby /* 2939196d8acSJiri Slaby * This should be a safe test for anyone who doesn't trust the 2949196d8acSJiri Slaby * IIR bits on their UART, but it's specifically designed for 2959196d8acSJiri Slaby * the "Diva" UART used on the management processor on many HP 2969196d8acSJiri Slaby * ia64 and parisc boxes. 2979196d8acSJiri Slaby */ 2989196d8acSJiri Slaby lsr = serial_in(up, UART_LSR); 2999196d8acSJiri Slaby up->lsr_saved_flags |= lsr & LSR_SAVE_FLAGS; 3009196d8acSJiri Slaby if ((iir & UART_IIR_NO_INT) && (up->ier & UART_IER_THRI) && 3019196d8acSJiri Slaby (!uart_circ_empty(&up->port.state->xmit) || up->port.x_char) && 3029196d8acSJiri Slaby (lsr & UART_LSR_THRE)) { 3039196d8acSJiri Slaby iir &= ~(UART_IIR_ID | UART_IIR_NO_INT); 3049196d8acSJiri Slaby iir |= UART_IIR_THRI; 3059196d8acSJiri Slaby } 3069196d8acSJiri Slaby 3079196d8acSJiri Slaby if (!(iir & UART_IIR_NO_INT)) 3089196d8acSJiri Slaby serial8250_tx_chars(up); 3099196d8acSJiri Slaby 3109196d8acSJiri Slaby if (up->port.irq) 3119196d8acSJiri Slaby serial_out(up, UART_IER, ier); 3129196d8acSJiri Slaby 3139196d8acSJiri Slaby spin_unlock_irqrestore(&up->port.lock, flags); 3149196d8acSJiri Slaby 3159196d8acSJiri Slaby /* Standard timer interval plus 0.2s to keep the port running */ 3169196d8acSJiri Slaby mod_timer(&up->timer, 3179196d8acSJiri Slaby jiffies + uart_poll_timeout(&up->port) + HZ / 5); 3189196d8acSJiri Slaby } 3199196d8acSJiri Slaby 320a4416cd1SPeter Hurley static int univ8250_setup_irq(struct uart_8250_port *up) 321a4416cd1SPeter Hurley { 322a4416cd1SPeter Hurley struct uart_port *port = &up->port; 323a4416cd1SPeter Hurley int retval = 0; 324a4416cd1SPeter Hurley 325a4416cd1SPeter Hurley /* 326a4416cd1SPeter Hurley * The above check will only give an accurate result the first time 327a4416cd1SPeter Hurley * the port is opened so this value needs to be preserved. 328a4416cd1SPeter Hurley */ 329a4416cd1SPeter Hurley if (up->bugs & UART_BUG_THRE) { 330a4416cd1SPeter Hurley pr_debug("ttyS%d - using backup timer\n", serial_index(port)); 331a4416cd1SPeter Hurley 332a4416cd1SPeter Hurley up->timer.function = serial8250_backup_timeout; 333a4416cd1SPeter Hurley up->timer.data = (unsigned long)up; 334a4416cd1SPeter Hurley mod_timer(&up->timer, jiffies + 335a4416cd1SPeter Hurley uart_poll_timeout(port) + HZ / 5); 336a4416cd1SPeter Hurley } 337a4416cd1SPeter Hurley 338a4416cd1SPeter Hurley /* 339a4416cd1SPeter Hurley * If the "interrupt" for this port doesn't correspond with any 340a4416cd1SPeter Hurley * hardware interrupt, we use a timer-based system. The original 341a4416cd1SPeter Hurley * driver used to do this with IRQ0. 342a4416cd1SPeter Hurley */ 343a4416cd1SPeter Hurley if (!port->irq) { 344a4416cd1SPeter Hurley up->timer.data = (unsigned long)up; 345a4416cd1SPeter Hurley mod_timer(&up->timer, jiffies + uart_poll_timeout(port)); 346a4416cd1SPeter Hurley } else 347a4416cd1SPeter Hurley retval = serial_link_irq_chain(up); 348a4416cd1SPeter Hurley 349a4416cd1SPeter Hurley return retval; 350a4416cd1SPeter Hurley } 351a4416cd1SPeter Hurley 352a4416cd1SPeter Hurley static void univ8250_release_irq(struct uart_8250_port *up) 353a4416cd1SPeter Hurley { 354a4416cd1SPeter Hurley struct uart_port *port = &up->port; 355a4416cd1SPeter Hurley 356a4416cd1SPeter Hurley del_timer_sync(&up->timer); 357a4416cd1SPeter Hurley up->timer.function = serial8250_timeout; 358a4416cd1SPeter Hurley if (port->irq) 359a4416cd1SPeter Hurley serial_unlink_irq_chain(up); 360a4416cd1SPeter Hurley } 361a4416cd1SPeter Hurley 362cd52b759SPeter Hurley #ifdef CONFIG_SERIAL_8250_RSA 3639196d8acSJiri Slaby static int serial8250_request_rsa_resource(struct uart_8250_port *up) 3649196d8acSJiri Slaby { 3659196d8acSJiri Slaby unsigned long start = UART_RSA_BASE << up->port.regshift; 3669196d8acSJiri Slaby unsigned int size = 8 << up->port.regshift; 3679196d8acSJiri Slaby struct uart_port *port = &up->port; 3689196d8acSJiri Slaby int ret = -EINVAL; 3699196d8acSJiri Slaby 3709196d8acSJiri Slaby switch (port->iotype) { 3719196d8acSJiri Slaby case UPIO_HUB6: 3729196d8acSJiri Slaby case UPIO_PORT: 3739196d8acSJiri Slaby start += port->iobase; 3749196d8acSJiri Slaby if (request_region(start, size, "serial-rsa")) 3759196d8acSJiri Slaby ret = 0; 3769196d8acSJiri Slaby else 3779196d8acSJiri Slaby ret = -EBUSY; 3789196d8acSJiri Slaby break; 3799196d8acSJiri Slaby } 3809196d8acSJiri Slaby 3819196d8acSJiri Slaby return ret; 3829196d8acSJiri Slaby } 3839196d8acSJiri Slaby 3849196d8acSJiri Slaby static void serial8250_release_rsa_resource(struct uart_8250_port *up) 3859196d8acSJiri Slaby { 3869196d8acSJiri Slaby unsigned long offset = UART_RSA_BASE << up->port.regshift; 3879196d8acSJiri Slaby unsigned int size = 8 << up->port.regshift; 3889196d8acSJiri Slaby struct uart_port *port = &up->port; 3899196d8acSJiri Slaby 3909196d8acSJiri Slaby switch (port->iotype) { 3919196d8acSJiri Slaby case UPIO_HUB6: 3929196d8acSJiri Slaby case UPIO_PORT: 3939196d8acSJiri Slaby release_region(port->iobase + offset, size); 3949196d8acSJiri Slaby break; 3959196d8acSJiri Slaby } 3969196d8acSJiri Slaby } 397cd52b759SPeter Hurley #endif 3989196d8acSJiri Slaby 39940375393SPeter Hurley static const struct uart_ops *base_ops; 40040375393SPeter Hurley static struct uart_ops univ8250_port_ops; 40140375393SPeter Hurley 402a4416cd1SPeter Hurley static const struct uart_8250_ops univ8250_driver_ops = { 403a4416cd1SPeter Hurley .setup_irq = univ8250_setup_irq, 404a4416cd1SPeter Hurley .release_irq = univ8250_release_irq, 405a4416cd1SPeter Hurley }; 406a4416cd1SPeter Hurley 4079196d8acSJiri Slaby static struct uart_8250_port serial8250_ports[UART_NR]; 4089196d8acSJiri Slaby 409ae14a795SSebastian Andrzej Siewior /** 410ae14a795SSebastian Andrzej Siewior * serial8250_get_port - retrieve struct uart_8250_port 411ae14a795SSebastian Andrzej Siewior * @line: serial line number 412ae14a795SSebastian Andrzej Siewior * 413ae14a795SSebastian Andrzej Siewior * This function retrieves struct uart_8250_port for the specific line. 414ae14a795SSebastian Andrzej Siewior * This struct *must* *not* be used to perform a 8250 or serial core operation 415ae14a795SSebastian Andrzej Siewior * which is not accessible otherwise. Its only purpose is to make the struct 416ae14a795SSebastian Andrzej Siewior * accessible to the runtime-pm callbacks for context suspend/restore. 417ae14a795SSebastian Andrzej Siewior * The lock assumption made here is none because runtime-pm suspend/resume 418ae14a795SSebastian Andrzej Siewior * callbacks should not be invoked if there is any operation performed on the 419ae14a795SSebastian Andrzej Siewior * port. 420ae14a795SSebastian Andrzej Siewior */ 421ae14a795SSebastian Andrzej Siewior struct uart_8250_port *serial8250_get_port(int line) 422ae14a795SSebastian Andrzej Siewior { 423ae14a795SSebastian Andrzej Siewior return &serial8250_ports[line]; 424ae14a795SSebastian Andrzej Siewior } 425ae14a795SSebastian Andrzej Siewior EXPORT_SYMBOL_GPL(serial8250_get_port); 426ae14a795SSebastian Andrzej Siewior 4279196d8acSJiri Slaby static void (*serial8250_isa_config)(int port, struct uart_port *up, 4289196d8acSJiri Slaby unsigned short *capabilities); 4299196d8acSJiri Slaby 4309196d8acSJiri Slaby void serial8250_set_isa_configurator( 4319196d8acSJiri Slaby void (*v)(int port, struct uart_port *up, unsigned short *capabilities)) 4329196d8acSJiri Slaby { 4339196d8acSJiri Slaby serial8250_isa_config = v; 4349196d8acSJiri Slaby } 4359196d8acSJiri Slaby EXPORT_SYMBOL(serial8250_set_isa_configurator); 4369196d8acSJiri Slaby 43740375393SPeter Hurley #ifdef CONFIG_SERIAL_8250_RSA 43840375393SPeter Hurley 43940375393SPeter Hurley static void univ8250_config_port(struct uart_port *port, int flags) 44040375393SPeter Hurley { 44140375393SPeter Hurley struct uart_8250_port *up = up_to_u8250p(port); 44240375393SPeter Hurley 44340375393SPeter Hurley up->probe &= ~UART_PROBE_RSA; 44440375393SPeter Hurley if (port->type == PORT_RSA) { 44540375393SPeter Hurley if (serial8250_request_rsa_resource(up) == 0) 44640375393SPeter Hurley up->probe |= UART_PROBE_RSA; 44740375393SPeter Hurley } else if (flags & UART_CONFIG_TYPE) { 44840375393SPeter Hurley int i; 44940375393SPeter Hurley 45040375393SPeter Hurley for (i = 0; i < probe_rsa_count; i++) { 45140375393SPeter Hurley if (probe_rsa[i] == up->port.iobase) { 45240375393SPeter Hurley if (serial8250_request_rsa_resource(up) == 0) 45340375393SPeter Hurley up->probe |= UART_PROBE_RSA; 45440375393SPeter Hurley break; 45540375393SPeter Hurley } 45640375393SPeter Hurley } 45740375393SPeter Hurley } 45840375393SPeter Hurley 45940375393SPeter Hurley base_ops->config_port(port, flags); 46040375393SPeter Hurley 46140375393SPeter Hurley if (port->type != PORT_RSA && up->probe & UART_PROBE_RSA) 46240375393SPeter Hurley serial8250_release_rsa_resource(up); 46340375393SPeter Hurley } 46440375393SPeter Hurley 46540375393SPeter Hurley static int univ8250_request_port(struct uart_port *port) 46640375393SPeter Hurley { 46740375393SPeter Hurley struct uart_8250_port *up = up_to_u8250p(port); 46840375393SPeter Hurley int ret; 46940375393SPeter Hurley 47040375393SPeter Hurley ret = base_ops->request_port(port); 47140375393SPeter Hurley if (ret == 0 && port->type == PORT_RSA) { 47240375393SPeter Hurley ret = serial8250_request_rsa_resource(up); 47340375393SPeter Hurley if (ret < 0) 47440375393SPeter Hurley base_ops->release_port(port); 47540375393SPeter Hurley } 47640375393SPeter Hurley 47740375393SPeter Hurley return ret; 47840375393SPeter Hurley } 47940375393SPeter Hurley 48040375393SPeter Hurley static void univ8250_release_port(struct uart_port *port) 48140375393SPeter Hurley { 48240375393SPeter Hurley struct uart_8250_port *up = up_to_u8250p(port); 48340375393SPeter Hurley 48440375393SPeter Hurley if (port->type == PORT_RSA) 48540375393SPeter Hurley serial8250_release_rsa_resource(up); 48640375393SPeter Hurley base_ops->release_port(port); 48740375393SPeter Hurley } 48840375393SPeter Hurley 48940375393SPeter Hurley static void univ8250_rsa_support(struct uart_ops *ops) 49040375393SPeter Hurley { 49140375393SPeter Hurley ops->config_port = univ8250_config_port; 49240375393SPeter Hurley ops->request_port = univ8250_request_port; 49340375393SPeter Hurley ops->release_port = univ8250_release_port; 49440375393SPeter Hurley } 49540375393SPeter Hurley 49640375393SPeter Hurley #else 49740375393SPeter Hurley #define univ8250_rsa_support(x) do { } while (0) 49840375393SPeter Hurley #endif /* CONFIG_SERIAL_8250_RSA */ 49940375393SPeter Hurley 5009196d8acSJiri Slaby static void __init serial8250_isa_init_ports(void) 5019196d8acSJiri Slaby { 5029196d8acSJiri Slaby struct uart_8250_port *up; 5039196d8acSJiri Slaby static int first = 1; 5049196d8acSJiri Slaby int i, irqflag = 0; 5059196d8acSJiri Slaby 5069196d8acSJiri Slaby if (!first) 5079196d8acSJiri Slaby return; 5089196d8acSJiri Slaby first = 0; 5099196d8acSJiri Slaby 5109196d8acSJiri Slaby if (nr_uarts > UART_NR) 5119196d8acSJiri Slaby nr_uarts = UART_NR; 5129196d8acSJiri Slaby 513317a6842SKyle McMartin for (i = 0; i < nr_uarts; i++) { 5149196d8acSJiri Slaby struct uart_8250_port *up = &serial8250_ports[i]; 5159196d8acSJiri Slaby struct uart_port *port = &up->port; 5169196d8acSJiri Slaby 5179196d8acSJiri Slaby port->line = i; 5180a16e2c1SPeter Hurley serial8250_init_port(up); 51940375393SPeter Hurley if (!base_ops) 52040375393SPeter Hurley base_ops = port->ops; 52140375393SPeter Hurley port->ops = &univ8250_port_ops; 5229196d8acSJiri Slaby 5239196d8acSJiri Slaby init_timer(&up->timer); 5249196d8acSJiri Slaby up->timer.function = serial8250_timeout; 5259196d8acSJiri Slaby 526a4416cd1SPeter Hurley up->ops = &univ8250_driver_ops; 527a4416cd1SPeter Hurley 5289196d8acSJiri Slaby /* 5299196d8acSJiri Slaby * ALPHA_KLUDGE_MCR needs to be killed. 5309196d8acSJiri Slaby */ 5319196d8acSJiri Slaby up->mcr_mask = ~ALPHA_KLUDGE_MCR; 5329196d8acSJiri Slaby up->mcr_force = ALPHA_KLUDGE_MCR; 5339196d8acSJiri Slaby } 5349196d8acSJiri Slaby 53540375393SPeter Hurley /* chain base port ops to support Remote Supervisor Adapter */ 53640375393SPeter Hurley univ8250_port_ops = *base_ops; 53740375393SPeter Hurley univ8250_rsa_support(&univ8250_port_ops); 53840375393SPeter Hurley 5399196d8acSJiri Slaby if (share_irqs) 5409196d8acSJiri Slaby irqflag = IRQF_SHARED; 5419196d8acSJiri Slaby 5429196d8acSJiri Slaby for (i = 0, up = serial8250_ports; 5439196d8acSJiri Slaby i < ARRAY_SIZE(old_serial_port) && i < nr_uarts; 5449196d8acSJiri Slaby i++, up++) { 5459196d8acSJiri Slaby struct uart_port *port = &up->port; 5469196d8acSJiri Slaby 5479196d8acSJiri Slaby port->iobase = old_serial_port[i].port; 5489196d8acSJiri Slaby port->irq = irq_canonicalize(old_serial_port[i].irq); 5499196d8acSJiri Slaby port->irqflags = old_serial_port[i].irqflags; 5509196d8acSJiri Slaby port->uartclk = old_serial_port[i].baud_base * 16; 5519196d8acSJiri Slaby port->flags = old_serial_port[i].flags; 5529196d8acSJiri Slaby port->hub6 = old_serial_port[i].hub6; 5539196d8acSJiri Slaby port->membase = old_serial_port[i].iomem_base; 5549196d8acSJiri Slaby port->iotype = old_serial_port[i].io_type; 5559196d8acSJiri Slaby port->regshift = old_serial_port[i].iomem_reg_shift; 5561a53e079SPeter Hurley serial8250_set_defaults(up); 5571a53e079SPeter Hurley 5589196d8acSJiri Slaby port->irqflags |= irqflag; 5599196d8acSJiri Slaby if (serial8250_isa_config != NULL) 5609196d8acSJiri Slaby serial8250_isa_config(i, &up->port, &up->capabilities); 5619196d8acSJiri Slaby } 5629196d8acSJiri Slaby } 5639196d8acSJiri Slaby 5649196d8acSJiri Slaby static void __init 5659196d8acSJiri Slaby serial8250_register_ports(struct uart_driver *drv, struct device *dev) 5669196d8acSJiri Slaby { 5679196d8acSJiri Slaby int i; 5689196d8acSJiri Slaby 5699196d8acSJiri Slaby for (i = 0; i < nr_uarts; i++) { 5709196d8acSJiri Slaby struct uart_8250_port *up = &serial8250_ports[i]; 5719196d8acSJiri Slaby 572e4fda3a0SMaciej S. Szmigiero if (up->port.type == PORT_8250_CIR) 573e4fda3a0SMaciej S. Szmigiero continue; 574e4fda3a0SMaciej S. Szmigiero 5759196d8acSJiri Slaby if (up->port.dev) 5769196d8acSJiri Slaby continue; 5779196d8acSJiri Slaby 5789196d8acSJiri Slaby up->port.dev = dev; 5799196d8acSJiri Slaby 580e13cb72bSPeter Hurley if (skip_txen_test) 581e13cb72bSPeter Hurley up->port.flags |= UPF_NO_TXEN_TEST; 582e13cb72bSPeter Hurley 5839196d8acSJiri Slaby uart_add_one_port(drv, &up->port); 5849196d8acSJiri Slaby } 5859196d8acSJiri Slaby } 5869196d8acSJiri Slaby 5879196d8acSJiri Slaby #ifdef CONFIG_SERIAL_8250_CONSOLE 5889196d8acSJiri Slaby 5896e281571SPeter Hurley static void univ8250_console_write(struct console *co, const char *s, 5906e281571SPeter Hurley unsigned int count) 5919196d8acSJiri Slaby { 5926e281571SPeter Hurley struct uart_8250_port *up = &serial8250_ports[co->index]; 5936e281571SPeter Hurley 5946e281571SPeter Hurley serial8250_console_write(up, s, count); 5956e281571SPeter Hurley } 5966e281571SPeter Hurley 5976e281571SPeter Hurley static int univ8250_console_setup(struct console *co, char *options) 5986e281571SPeter Hurley { 59987515772SPeter Hurley struct uart_port *port; 600d70a7b16SPeter Hurley int retval; 6016e281571SPeter Hurley 6029196d8acSJiri Slaby /* 6039196d8acSJiri Slaby * Check whether an invalid uart number has been specified, and 6049196d8acSJiri Slaby * if so, search for the first available port that does have 6059196d8acSJiri Slaby * console support. 6069196d8acSJiri Slaby */ 607317a6842SKyle McMartin if (co->index >= nr_uarts) 6089196d8acSJiri Slaby co->index = 0; 60987515772SPeter Hurley port = &serial8250_ports[co->index].port; 6106e281571SPeter Hurley /* link port to console */ 61187515772SPeter Hurley port->cons = co; 6129196d8acSJiri Slaby 613d70a7b16SPeter Hurley retval = serial8250_console_setup(port, options, false); 614d70a7b16SPeter Hurley if (retval != 0) 615d70a7b16SPeter Hurley port->cons = NULL; 616d70a7b16SPeter Hurley return retval; 6179196d8acSJiri Slaby } 6189196d8acSJiri Slaby 619c7cef0a8SPeter Hurley /** 6206e281571SPeter Hurley * univ8250_console_match - non-standard console matching 621c7cef0a8SPeter Hurley * @co: registering console 622c7cef0a8SPeter Hurley * @name: name from console command line 623c7cef0a8SPeter Hurley * @idx: index from console command line 624c7cef0a8SPeter Hurley * @options: ptr to option string from console command line 625c7cef0a8SPeter Hurley * 626c7cef0a8SPeter Hurley * Only attempts to match console command lines of the form: 627bd94c407SMasahiro Yamada * console=uart[8250],io|mmio|mmio16|mmio32,<addr>[,<options>] 628ca782f16SPeter Hurley * console=uart[8250],0x<addr>[,<options>] 629c7cef0a8SPeter Hurley * This form is used to register an initial earlycon boot console and 630c7cef0a8SPeter Hurley * replace it with the serial8250_console at 8250 driver init. 631c7cef0a8SPeter Hurley * 632c7cef0a8SPeter Hurley * Performs console setup for a match (as required by interface) 633ca782f16SPeter Hurley * If no <options> are specified, then assume the h/w is already setup. 634c7cef0a8SPeter Hurley * 635c7cef0a8SPeter Hurley * Returns 0 if console matches; otherwise non-zero to use default matching 636c7cef0a8SPeter Hurley */ 6376e281571SPeter Hurley static int univ8250_console_match(struct console *co, char *name, int idx, 638c7cef0a8SPeter Hurley char *options) 6399196d8acSJiri Slaby { 640c7cef0a8SPeter Hurley char match[] = "uart"; /* 8250-specific earlycon name */ 641c7cef0a8SPeter Hurley unsigned char iotype; 642c7cef0a8SPeter Hurley unsigned long addr; 643c7cef0a8SPeter Hurley int i; 644c7cef0a8SPeter Hurley 645c7cef0a8SPeter Hurley if (strncmp(name, match, 4) != 0) 646c7cef0a8SPeter Hurley return -ENODEV; 647c7cef0a8SPeter Hurley 648c7cef0a8SPeter Hurley if (uart_parse_earlycon(options, &iotype, &addr, &options)) 649c7cef0a8SPeter Hurley return -ENODEV; 650c7cef0a8SPeter Hurley 651c7cef0a8SPeter Hurley /* try to match the port specified on the command line */ 652c7cef0a8SPeter Hurley for (i = 0; i < nr_uarts; i++) { 653c7cef0a8SPeter Hurley struct uart_port *port = &serial8250_ports[i].port; 654c7cef0a8SPeter Hurley 655c7cef0a8SPeter Hurley if (port->iotype != iotype) 656c7cef0a8SPeter Hurley continue; 657bd94c407SMasahiro Yamada if ((iotype == UPIO_MEM || iotype == UPIO_MEM16 || 658bd94c407SMasahiro Yamada iotype == UPIO_MEM32 || iotype == UPIO_MEM32BE) 659bd94c407SMasahiro Yamada && (port->mapbase != addr)) 660c7cef0a8SPeter Hurley continue; 661c7cef0a8SPeter Hurley if (iotype == UPIO_PORT && port->iobase != addr) 662c7cef0a8SPeter Hurley continue; 663c7cef0a8SPeter Hurley 664c7cef0a8SPeter Hurley co->index = i; 66587515772SPeter Hurley port->cons = co; 66687515772SPeter Hurley return serial8250_console_setup(port, options, true); 667c7cef0a8SPeter Hurley } 668c7cef0a8SPeter Hurley 669c7cef0a8SPeter Hurley return -ENODEV; 6709196d8acSJiri Slaby } 6719196d8acSJiri Slaby 6726e281571SPeter Hurley static struct console univ8250_console = { 6739196d8acSJiri Slaby .name = "ttyS", 6746e281571SPeter Hurley .write = univ8250_console_write, 6759196d8acSJiri Slaby .device = uart_console_device, 6766e281571SPeter Hurley .setup = univ8250_console_setup, 6776e281571SPeter Hurley .match = univ8250_console_match, 6789196d8acSJiri Slaby .flags = CON_PRINTBUFFER | CON_ANYTIME, 6799196d8acSJiri Slaby .index = -1, 6809196d8acSJiri Slaby .data = &serial8250_reg, 6819196d8acSJiri Slaby }; 6829196d8acSJiri Slaby 6836e281571SPeter Hurley static int __init univ8250_console_init(void) 6849196d8acSJiri Slaby { 68559cfc45fSJan Kiszka if (nr_uarts == 0) 68659cfc45fSJan Kiszka return -ENODEV; 68759cfc45fSJan Kiszka 6889196d8acSJiri Slaby serial8250_isa_init_ports(); 6896e281571SPeter Hurley register_console(&univ8250_console); 6909196d8acSJiri Slaby return 0; 6919196d8acSJiri Slaby } 6926e281571SPeter Hurley console_initcall(univ8250_console_init); 6939196d8acSJiri Slaby 6946e281571SPeter Hurley #define SERIAL8250_CONSOLE &univ8250_console 6959196d8acSJiri Slaby #else 6969196d8acSJiri Slaby #define SERIAL8250_CONSOLE NULL 6979196d8acSJiri Slaby #endif 6989196d8acSJiri Slaby 6999196d8acSJiri Slaby static struct uart_driver serial8250_reg = { 7009196d8acSJiri Slaby .owner = THIS_MODULE, 7019196d8acSJiri Slaby .driver_name = "serial", 7029196d8acSJiri Slaby .dev_name = "ttyS", 7039196d8acSJiri Slaby .major = TTY_MAJOR, 7049196d8acSJiri Slaby .minor = 64, 7059196d8acSJiri Slaby .cons = SERIAL8250_CONSOLE, 7069196d8acSJiri Slaby }; 7079196d8acSJiri Slaby 7089196d8acSJiri Slaby /* 7099196d8acSJiri Slaby * early_serial_setup - early registration for 8250 ports 7109196d8acSJiri Slaby * 7119196d8acSJiri Slaby * Setup an 8250 port structure prior to console initialisation. Use 7129196d8acSJiri Slaby * after console initialisation will cause undefined behaviour. 7139196d8acSJiri Slaby */ 7149196d8acSJiri Slaby int __init early_serial_setup(struct uart_port *port) 7159196d8acSJiri Slaby { 7169196d8acSJiri Slaby struct uart_port *p; 7179196d8acSJiri Slaby 71859cfc45fSJan Kiszka if (port->line >= ARRAY_SIZE(serial8250_ports) || nr_uarts == 0) 7199196d8acSJiri Slaby return -ENODEV; 7209196d8acSJiri Slaby 7219196d8acSJiri Slaby serial8250_isa_init_ports(); 7229196d8acSJiri Slaby p = &serial8250_ports[port->line].port; 7239196d8acSJiri Slaby p->iobase = port->iobase; 7249196d8acSJiri Slaby p->membase = port->membase; 7259196d8acSJiri Slaby p->irq = port->irq; 7269196d8acSJiri Slaby p->irqflags = port->irqflags; 7279196d8acSJiri Slaby p->uartclk = port->uartclk; 7289196d8acSJiri Slaby p->fifosize = port->fifosize; 7299196d8acSJiri Slaby p->regshift = port->regshift; 7309196d8acSJiri Slaby p->iotype = port->iotype; 7319196d8acSJiri Slaby p->flags = port->flags; 7329196d8acSJiri Slaby p->mapbase = port->mapbase; 733ee97d0e3SMans Rullgard p->mapsize = port->mapsize; 7349196d8acSJiri Slaby p->private_data = port->private_data; 7359196d8acSJiri Slaby p->type = port->type; 7369196d8acSJiri Slaby p->line = port->line; 7379196d8acSJiri Slaby 7381a53e079SPeter Hurley serial8250_set_defaults(up_to_u8250p(p)); 7391a53e079SPeter Hurley 7409196d8acSJiri Slaby if (port->serial_in) 7419196d8acSJiri Slaby p->serial_in = port->serial_in; 7429196d8acSJiri Slaby if (port->serial_out) 7439196d8acSJiri Slaby p->serial_out = port->serial_out; 7449196d8acSJiri Slaby if (port->handle_irq) 7459196d8acSJiri Slaby p->handle_irq = port->handle_irq; 7469196d8acSJiri Slaby 7479196d8acSJiri Slaby return 0; 7489196d8acSJiri Slaby } 7499196d8acSJiri Slaby 7509196d8acSJiri Slaby /** 7519196d8acSJiri Slaby * serial8250_suspend_port - suspend one serial port 7529196d8acSJiri Slaby * @line: serial line number 7539196d8acSJiri Slaby * 7549196d8acSJiri Slaby * Suspend one serial port. 7559196d8acSJiri Slaby */ 7569196d8acSJiri Slaby void serial8250_suspend_port(int line) 7579196d8acSJiri Slaby { 7584516d50aSPeter Hurley struct uart_8250_port *up = &serial8250_ports[line]; 7594516d50aSPeter Hurley struct uart_port *port = &up->port; 7604516d50aSPeter Hurley 7614516d50aSPeter Hurley if (!console_suspend_enabled && uart_console(port) && 7624516d50aSPeter Hurley port->type != PORT_8250) { 7634516d50aSPeter Hurley unsigned char canary = 0xa5; 7644516d50aSPeter Hurley serial_out(up, UART_SCR, canary); 765f01a0bd8SPeter Hurley if (serial_in(up, UART_SCR) == canary) 7664516d50aSPeter Hurley up->canary = canary; 7674516d50aSPeter Hurley } 7684516d50aSPeter Hurley 7694516d50aSPeter Hurley uart_suspend_port(&serial8250_reg, port); 7709196d8acSJiri Slaby } 771b34f9fafSAnton Wuerfel EXPORT_SYMBOL(serial8250_suspend_port); 7729196d8acSJiri Slaby 7739196d8acSJiri Slaby /** 7749196d8acSJiri Slaby * serial8250_resume_port - resume one serial port 7759196d8acSJiri Slaby * @line: serial line number 7769196d8acSJiri Slaby * 7779196d8acSJiri Slaby * Resume one serial port. 7789196d8acSJiri Slaby */ 7799196d8acSJiri Slaby void serial8250_resume_port(int line) 7809196d8acSJiri Slaby { 7819196d8acSJiri Slaby struct uart_8250_port *up = &serial8250_ports[line]; 7829196d8acSJiri Slaby struct uart_port *port = &up->port; 7839196d8acSJiri Slaby 7844516d50aSPeter Hurley up->canary = 0; 7854516d50aSPeter Hurley 7869196d8acSJiri Slaby if (up->capabilities & UART_NATSEMI) { 7879196d8acSJiri Slaby /* Ensure it's still in high speed mode */ 7889196d8acSJiri Slaby serial_port_out(port, UART_LCR, 0xE0); 7899196d8acSJiri Slaby 7909196d8acSJiri Slaby ns16550a_goto_highspeed(up); 7919196d8acSJiri Slaby 7929196d8acSJiri Slaby serial_port_out(port, UART_LCR, 0); 7939196d8acSJiri Slaby port->uartclk = 921600*16; 7949196d8acSJiri Slaby } 7959196d8acSJiri Slaby uart_resume_port(&serial8250_reg, port); 7969196d8acSJiri Slaby } 797b34f9fafSAnton Wuerfel EXPORT_SYMBOL(serial8250_resume_port); 7989196d8acSJiri Slaby 7999196d8acSJiri Slaby /* 8009196d8acSJiri Slaby * Register a set of serial devices attached to a platform device. The 8019196d8acSJiri Slaby * list is terminated with a zero flags entry, which means we expect 8029196d8acSJiri Slaby * all entries to have at least UPF_BOOT_AUTOCONF set. 8039196d8acSJiri Slaby */ 8049196d8acSJiri Slaby static int serial8250_probe(struct platform_device *dev) 8059196d8acSJiri Slaby { 806574de559SJingoo Han struct plat_serial8250_port *p = dev_get_platdata(&dev->dev); 8079196d8acSJiri Slaby struct uart_8250_port uart; 8089196d8acSJiri Slaby int ret, i, irqflag = 0; 8099196d8acSJiri Slaby 8109196d8acSJiri Slaby memset(&uart, 0, sizeof(uart)); 8119196d8acSJiri Slaby 8129196d8acSJiri Slaby if (share_irqs) 8139196d8acSJiri Slaby irqflag = IRQF_SHARED; 8149196d8acSJiri Slaby 8159196d8acSJiri Slaby for (i = 0; p && p->flags != 0; p++, i++) { 8169196d8acSJiri Slaby uart.port.iobase = p->iobase; 8179196d8acSJiri Slaby uart.port.membase = p->membase; 8189196d8acSJiri Slaby uart.port.irq = p->irq; 8199196d8acSJiri Slaby uart.port.irqflags = p->irqflags; 8209196d8acSJiri Slaby uart.port.uartclk = p->uartclk; 8219196d8acSJiri Slaby uart.port.regshift = p->regshift; 8229196d8acSJiri Slaby uart.port.iotype = p->iotype; 8239196d8acSJiri Slaby uart.port.flags = p->flags; 8249196d8acSJiri Slaby uart.port.mapbase = p->mapbase; 8259196d8acSJiri Slaby uart.port.hub6 = p->hub6; 8269196d8acSJiri Slaby uart.port.private_data = p->private_data; 8279196d8acSJiri Slaby uart.port.type = p->type; 8289196d8acSJiri Slaby uart.port.serial_in = p->serial_in; 8299196d8acSJiri Slaby uart.port.serial_out = p->serial_out; 8309196d8acSJiri Slaby uart.port.handle_irq = p->handle_irq; 8319196d8acSJiri Slaby uart.port.handle_break = p->handle_break; 8329196d8acSJiri Slaby uart.port.set_termios = p->set_termios; 8339196d8acSJiri Slaby uart.port.pm = p->pm; 8349196d8acSJiri Slaby uart.port.dev = &dev->dev; 8359196d8acSJiri Slaby uart.port.irqflags |= irqflag; 8369196d8acSJiri Slaby ret = serial8250_register_8250_port(&uart); 8379196d8acSJiri Slaby if (ret < 0) { 8389196d8acSJiri Slaby dev_err(&dev->dev, "unable to register port at index %d " 8399196d8acSJiri Slaby "(IO%lx MEM%llx IRQ%d): %d\n", i, 8409196d8acSJiri Slaby p->iobase, (unsigned long long)p->mapbase, 8419196d8acSJiri Slaby p->irq, ret); 8429196d8acSJiri Slaby } 8439196d8acSJiri Slaby } 8449196d8acSJiri Slaby return 0; 8459196d8acSJiri Slaby } 8469196d8acSJiri Slaby 8479196d8acSJiri Slaby /* 8489196d8acSJiri Slaby * Remove serial ports registered against a platform device. 8499196d8acSJiri Slaby */ 8509196d8acSJiri Slaby static int serial8250_remove(struct platform_device *dev) 8519196d8acSJiri Slaby { 8529196d8acSJiri Slaby int i; 8539196d8acSJiri Slaby 854317a6842SKyle McMartin for (i = 0; i < nr_uarts; i++) { 8559196d8acSJiri Slaby struct uart_8250_port *up = &serial8250_ports[i]; 8569196d8acSJiri Slaby 8579196d8acSJiri Slaby if (up->port.dev == &dev->dev) 8589196d8acSJiri Slaby serial8250_unregister_port(i); 8599196d8acSJiri Slaby } 8609196d8acSJiri Slaby return 0; 8619196d8acSJiri Slaby } 8629196d8acSJiri Slaby 8639196d8acSJiri Slaby static int serial8250_suspend(struct platform_device *dev, pm_message_t state) 8649196d8acSJiri Slaby { 8659196d8acSJiri Slaby int i; 8669196d8acSJiri Slaby 8679196d8acSJiri Slaby for (i = 0; i < UART_NR; i++) { 8689196d8acSJiri Slaby struct uart_8250_port *up = &serial8250_ports[i]; 8699196d8acSJiri Slaby 8709196d8acSJiri Slaby if (up->port.type != PORT_UNKNOWN && up->port.dev == &dev->dev) 8719196d8acSJiri Slaby uart_suspend_port(&serial8250_reg, &up->port); 8729196d8acSJiri Slaby } 8739196d8acSJiri Slaby 8749196d8acSJiri Slaby return 0; 8759196d8acSJiri Slaby } 8769196d8acSJiri Slaby 8779196d8acSJiri Slaby static int serial8250_resume(struct platform_device *dev) 8789196d8acSJiri Slaby { 8799196d8acSJiri Slaby int i; 8809196d8acSJiri Slaby 8819196d8acSJiri Slaby for (i = 0; i < UART_NR; i++) { 8829196d8acSJiri Slaby struct uart_8250_port *up = &serial8250_ports[i]; 8839196d8acSJiri Slaby 8849196d8acSJiri Slaby if (up->port.type != PORT_UNKNOWN && up->port.dev == &dev->dev) 8859196d8acSJiri Slaby serial8250_resume_port(i); 8869196d8acSJiri Slaby } 8879196d8acSJiri Slaby 8889196d8acSJiri Slaby return 0; 8899196d8acSJiri Slaby } 8909196d8acSJiri Slaby 8919196d8acSJiri Slaby static struct platform_driver serial8250_isa_driver = { 8929196d8acSJiri Slaby .probe = serial8250_probe, 8939196d8acSJiri Slaby .remove = serial8250_remove, 8949196d8acSJiri Slaby .suspend = serial8250_suspend, 8959196d8acSJiri Slaby .resume = serial8250_resume, 8969196d8acSJiri Slaby .driver = { 8979196d8acSJiri Slaby .name = "serial8250", 8989196d8acSJiri Slaby }, 8999196d8acSJiri Slaby }; 9009196d8acSJiri Slaby 9019196d8acSJiri Slaby /* 9029196d8acSJiri Slaby * This "device" covers _all_ ISA 8250-compatible serial devices listed 9039196d8acSJiri Slaby * in the table in include/asm/serial.h 9049196d8acSJiri Slaby */ 9059196d8acSJiri Slaby static struct platform_device *serial8250_isa_devs; 9069196d8acSJiri Slaby 9079196d8acSJiri Slaby /* 9089196d8acSJiri Slaby * serial8250_register_8250_port and serial8250_unregister_port allows for 9099196d8acSJiri Slaby * 16x50 serial ports to be configured at run-time, to support PCMCIA 9109196d8acSJiri Slaby * modems and PCI multiport cards. 9119196d8acSJiri Slaby */ 9129196d8acSJiri Slaby static DEFINE_MUTEX(serial_mutex); 9139196d8acSJiri Slaby 9149196d8acSJiri Slaby static struct uart_8250_port *serial8250_find_match_or_unused(struct uart_port *port) 9159196d8acSJiri Slaby { 9169196d8acSJiri Slaby int i; 9179196d8acSJiri Slaby 9189196d8acSJiri Slaby /* 9199196d8acSJiri Slaby * First, find a port entry which matches. 9209196d8acSJiri Slaby */ 921317a6842SKyle McMartin for (i = 0; i < nr_uarts; i++) 9229196d8acSJiri Slaby if (uart_match_port(&serial8250_ports[i].port, port)) 9239196d8acSJiri Slaby return &serial8250_ports[i]; 9249196d8acSJiri Slaby 92559b3e898SSebastian Andrzej Siewior /* try line number first if still available */ 92659b3e898SSebastian Andrzej Siewior i = port->line; 92759b3e898SSebastian Andrzej Siewior if (i < nr_uarts && serial8250_ports[i].port.type == PORT_UNKNOWN && 92859b3e898SSebastian Andrzej Siewior serial8250_ports[i].port.iobase == 0) 92959b3e898SSebastian Andrzej Siewior return &serial8250_ports[i]; 9309196d8acSJiri Slaby /* 9319196d8acSJiri Slaby * We didn't find a matching entry, so look for the first 9329196d8acSJiri Slaby * free entry. We look for one which hasn't been previously 9339196d8acSJiri Slaby * used (indicated by zero iobase). 9349196d8acSJiri Slaby */ 935317a6842SKyle McMartin for (i = 0; i < nr_uarts; i++) 9369196d8acSJiri Slaby if (serial8250_ports[i].port.type == PORT_UNKNOWN && 9379196d8acSJiri Slaby serial8250_ports[i].port.iobase == 0) 9389196d8acSJiri Slaby return &serial8250_ports[i]; 9399196d8acSJiri Slaby 9409196d8acSJiri Slaby /* 9419196d8acSJiri Slaby * That also failed. Last resort is to find any entry which 9429196d8acSJiri Slaby * doesn't have a real port associated with it. 9439196d8acSJiri Slaby */ 944317a6842SKyle McMartin for (i = 0; i < nr_uarts; i++) 9459196d8acSJiri Slaby if (serial8250_ports[i].port.type == PORT_UNKNOWN) 9469196d8acSJiri Slaby return &serial8250_ports[i]; 9479196d8acSJiri Slaby 9489196d8acSJiri Slaby return NULL; 9499196d8acSJiri Slaby } 9509196d8acSJiri Slaby 9519196d8acSJiri Slaby /** 9529196d8acSJiri Slaby * serial8250_register_8250_port - register a serial port 9539196d8acSJiri Slaby * @up: serial port template 9549196d8acSJiri Slaby * 9559196d8acSJiri Slaby * Configure the serial port specified by the request. If the 9569196d8acSJiri Slaby * port exists and is in use, it is hung up and unregistered 9579196d8acSJiri Slaby * first. 9589196d8acSJiri Slaby * 9599196d8acSJiri Slaby * The port is then probed and if necessary the IRQ is autodetected 9609196d8acSJiri Slaby * If this fails an error is returned. 9619196d8acSJiri Slaby * 9629196d8acSJiri Slaby * On success the port is ready to use and the line number is returned. 9639196d8acSJiri Slaby */ 9649196d8acSJiri Slaby int serial8250_register_8250_port(struct uart_8250_port *up) 9659196d8acSJiri Slaby { 9669196d8acSJiri Slaby struct uart_8250_port *uart; 9679196d8acSJiri Slaby int ret = -ENOSPC; 9689196d8acSJiri Slaby 9699196d8acSJiri Slaby if (up->port.uartclk == 0) 9709196d8acSJiri Slaby return -EINVAL; 9719196d8acSJiri Slaby 9729196d8acSJiri Slaby mutex_lock(&serial_mutex); 9739196d8acSJiri Slaby 9749196d8acSJiri Slaby uart = serial8250_find_match_or_unused(&up->port); 9759196d8acSJiri Slaby if (uart && uart->port.type != PORT_8250_CIR) { 9769196d8acSJiri Slaby if (uart->port.dev) 9779196d8acSJiri Slaby uart_remove_one_port(&serial8250_reg, &uart->port); 9789196d8acSJiri Slaby 9799196d8acSJiri Slaby uart->port.iobase = up->port.iobase; 9809196d8acSJiri Slaby uart->port.membase = up->port.membase; 9819196d8acSJiri Slaby uart->port.irq = up->port.irq; 9829196d8acSJiri Slaby uart->port.irqflags = up->port.irqflags; 9839196d8acSJiri Slaby uart->port.uartclk = up->port.uartclk; 9849196d8acSJiri Slaby uart->port.fifosize = up->port.fifosize; 9859196d8acSJiri Slaby uart->port.regshift = up->port.regshift; 9869196d8acSJiri Slaby uart->port.iotype = up->port.iotype; 9879196d8acSJiri Slaby uart->port.flags = up->port.flags | UPF_BOOT_AUTOCONF; 9889196d8acSJiri Slaby uart->bugs = up->bugs; 9899196d8acSJiri Slaby uart->port.mapbase = up->port.mapbase; 990ee97d0e3SMans Rullgard uart->port.mapsize = up->port.mapsize; 9919196d8acSJiri Slaby uart->port.private_data = up->port.private_data; 9929196d8acSJiri Slaby uart->tx_loadsz = up->tx_loadsz; 9939196d8acSJiri Slaby uart->capabilities = up->capabilities; 994234abab1SSebastian Andrzej Siewior uart->port.throttle = up->port.throttle; 995234abab1SSebastian Andrzej Siewior uart->port.unthrottle = up->port.unthrottle; 99646c55b4bSRicardo Ribalda Delgado uart->port.rs485_config = up->port.rs485_config; 99746c55b4bSRicardo Ribalda Delgado uart->port.rs485 = up->port.rs485; 998d53e1428SPeter Hurley uart->dma = up->dma; 9999196d8acSJiri Slaby 1000ef99f3aeSGreg Kroah-Hartman /* Take tx_loadsz from fifosize if it wasn't set separately */ 1001ef99f3aeSGreg Kroah-Hartman if (uart->port.fifosize && !uart->tx_loadsz) 1002ef99f3aeSGreg Kroah-Hartman uart->tx_loadsz = uart->port.fifosize; 1003ef99f3aeSGreg Kroah-Hartman 10049196d8acSJiri Slaby if (up->port.dev) 10059196d8acSJiri Slaby uart->port.dev = up->port.dev; 10069196d8acSJiri Slaby 1007e13cb72bSPeter Hurley if (skip_txen_test) 1008e13cb72bSPeter Hurley uart->port.flags |= UPF_NO_TXEN_TEST; 1009e13cb72bSPeter Hurley 10109196d8acSJiri Slaby if (up->port.flags & UPF_FIXED_TYPE) 1011afd483bdSPeter Hurley uart->port.type = up->port.type; 10129196d8acSJiri Slaby 10131a53e079SPeter Hurley serial8250_set_defaults(uart); 10141a53e079SPeter Hurley 10159196d8acSJiri Slaby /* Possibly override default I/O functions. */ 10169196d8acSJiri Slaby if (up->port.serial_in) 10179196d8acSJiri Slaby uart->port.serial_in = up->port.serial_in; 10189196d8acSJiri Slaby if (up->port.serial_out) 10199196d8acSJiri Slaby uart->port.serial_out = up->port.serial_out; 10209196d8acSJiri Slaby if (up->port.handle_irq) 10219196d8acSJiri Slaby uart->port.handle_irq = up->port.handle_irq; 10229196d8acSJiri Slaby /* Possibly override set_termios call */ 10239196d8acSJiri Slaby if (up->port.set_termios) 10249196d8acSJiri Slaby uart->port.set_termios = up->port.set_termios; 10254bf4ea9dSPeter Hurley if (up->port.set_mctrl) 10264bf4ea9dSPeter Hurley uart->port.set_mctrl = up->port.set_mctrl; 1027b99b121bSSebastian Andrzej Siewior if (up->port.startup) 1028b99b121bSSebastian Andrzej Siewior uart->port.startup = up->port.startup; 1029b99b121bSSebastian Andrzej Siewior if (up->port.shutdown) 1030b99b121bSSebastian Andrzej Siewior uart->port.shutdown = up->port.shutdown; 10319196d8acSJiri Slaby if (up->port.pm) 10329196d8acSJiri Slaby uart->port.pm = up->port.pm; 10339196d8acSJiri Slaby if (up->port.handle_break) 10349196d8acSJiri Slaby uart->port.handle_break = up->port.handle_break; 10359196d8acSJiri Slaby if (up->dl_read) 10369196d8acSJiri Slaby uart->dl_read = up->dl_read; 10379196d8acSJiri Slaby if (up->dl_write) 10389196d8acSJiri Slaby uart->dl_write = up->dl_write; 10399196d8acSJiri Slaby 1040e4fda3a0SMaciej S. Szmigiero if (uart->port.type != PORT_8250_CIR) { 10419196d8acSJiri Slaby if (serial8250_isa_config != NULL) 10429196d8acSJiri Slaby serial8250_isa_config(0, &uart->port, 10439196d8acSJiri Slaby &uart->capabilities); 10449196d8acSJiri Slaby 1045e4fda3a0SMaciej S. Szmigiero ret = uart_add_one_port(&serial8250_reg, 1046e4fda3a0SMaciej S. Szmigiero &uart->port); 10479196d8acSJiri Slaby if (ret == 0) 10489196d8acSJiri Slaby ret = uart->port.line; 1049e4fda3a0SMaciej S. Szmigiero } else { 1050e4fda3a0SMaciej S. Szmigiero dev_info(uart->port.dev, 1051e4fda3a0SMaciej S. Szmigiero "skipping CIR port at 0x%lx / 0x%llx, IRQ %d\n", 1052e4fda3a0SMaciej S. Szmigiero uart->port.iobase, 1053e4fda3a0SMaciej S. Szmigiero (unsigned long long)uart->port.mapbase, 1054e4fda3a0SMaciej S. Szmigiero uart->port.irq); 1055e4fda3a0SMaciej S. Szmigiero 1056e4fda3a0SMaciej S. Szmigiero ret = 0; 1057e4fda3a0SMaciej S. Szmigiero } 10589196d8acSJiri Slaby } 10599196d8acSJiri Slaby mutex_unlock(&serial_mutex); 10609196d8acSJiri Slaby 10619196d8acSJiri Slaby return ret; 10629196d8acSJiri Slaby } 10639196d8acSJiri Slaby EXPORT_SYMBOL(serial8250_register_8250_port); 10649196d8acSJiri Slaby 10659196d8acSJiri Slaby /** 10669196d8acSJiri Slaby * serial8250_unregister_port - remove a 16x50 serial port at runtime 10679196d8acSJiri Slaby * @line: serial line number 10689196d8acSJiri Slaby * 10699196d8acSJiri Slaby * Remove one serial port. This may not be called from interrupt 10709196d8acSJiri Slaby * context. We hand the port back to the our control. 10719196d8acSJiri Slaby */ 10729196d8acSJiri Slaby void serial8250_unregister_port(int line) 10739196d8acSJiri Slaby { 10749196d8acSJiri Slaby struct uart_8250_port *uart = &serial8250_ports[line]; 10759196d8acSJiri Slaby 10769196d8acSJiri Slaby mutex_lock(&serial_mutex); 10779196d8acSJiri Slaby uart_remove_one_port(&serial8250_reg, &uart->port); 10789196d8acSJiri Slaby if (serial8250_isa_devs) { 10799196d8acSJiri Slaby uart->port.flags &= ~UPF_BOOT_AUTOCONF; 1080e13cb72bSPeter Hurley if (skip_txen_test) 1081e13cb72bSPeter Hurley uart->port.flags |= UPF_NO_TXEN_TEST; 10829196d8acSJiri Slaby uart->port.type = PORT_UNKNOWN; 10839196d8acSJiri Slaby uart->port.dev = &serial8250_isa_devs->dev; 10845db496b9SPeter Hurley uart->capabilities = 0; 10859196d8acSJiri Slaby uart_add_one_port(&serial8250_reg, &uart->port); 10869196d8acSJiri Slaby } else { 10879196d8acSJiri Slaby uart->port.dev = NULL; 10889196d8acSJiri Slaby } 10899196d8acSJiri Slaby mutex_unlock(&serial_mutex); 10909196d8acSJiri Slaby } 10919196d8acSJiri Slaby EXPORT_SYMBOL(serial8250_unregister_port); 10929196d8acSJiri Slaby 10939196d8acSJiri Slaby static int __init serial8250_init(void) 10949196d8acSJiri Slaby { 10959196d8acSJiri Slaby int ret; 10969196d8acSJiri Slaby 109759cfc45fSJan Kiszka if (nr_uarts == 0) 109859cfc45fSJan Kiszka return -ENODEV; 109959cfc45fSJan Kiszka 11009196d8acSJiri Slaby serial8250_isa_init_ports(); 11019196d8acSJiri Slaby 11029196d8acSJiri Slaby printk(KERN_INFO "Serial: 8250/16550 driver, " 11039196d8acSJiri Slaby "%d ports, IRQ sharing %sabled\n", nr_uarts, 11049196d8acSJiri Slaby share_irqs ? "en" : "dis"); 11059196d8acSJiri Slaby 11069196d8acSJiri Slaby #ifdef CONFIG_SPARC 11079196d8acSJiri Slaby ret = sunserial_register_minors(&serial8250_reg, UART_NR); 11089196d8acSJiri Slaby #else 11099196d8acSJiri Slaby serial8250_reg.nr = UART_NR; 11109196d8acSJiri Slaby ret = uart_register_driver(&serial8250_reg); 11119196d8acSJiri Slaby #endif 11129196d8acSJiri Slaby if (ret) 11139196d8acSJiri Slaby goto out; 11149196d8acSJiri Slaby 11159196d8acSJiri Slaby ret = serial8250_pnp_init(); 11169196d8acSJiri Slaby if (ret) 11179196d8acSJiri Slaby goto unreg_uart_drv; 11189196d8acSJiri Slaby 11199196d8acSJiri Slaby serial8250_isa_devs = platform_device_alloc("serial8250", 11209196d8acSJiri Slaby PLAT8250_DEV_LEGACY); 11219196d8acSJiri Slaby if (!serial8250_isa_devs) { 11229196d8acSJiri Slaby ret = -ENOMEM; 11239196d8acSJiri Slaby goto unreg_pnp; 11249196d8acSJiri Slaby } 11259196d8acSJiri Slaby 11269196d8acSJiri Slaby ret = platform_device_add(serial8250_isa_devs); 11279196d8acSJiri Slaby if (ret) 11289196d8acSJiri Slaby goto put_dev; 11299196d8acSJiri Slaby 11309196d8acSJiri Slaby serial8250_register_ports(&serial8250_reg, &serial8250_isa_devs->dev); 11319196d8acSJiri Slaby 11329196d8acSJiri Slaby ret = platform_driver_register(&serial8250_isa_driver); 11339196d8acSJiri Slaby if (ret == 0) 11349196d8acSJiri Slaby goto out; 11359196d8acSJiri Slaby 11369196d8acSJiri Slaby platform_device_del(serial8250_isa_devs); 11379196d8acSJiri Slaby put_dev: 11389196d8acSJiri Slaby platform_device_put(serial8250_isa_devs); 11399196d8acSJiri Slaby unreg_pnp: 11409196d8acSJiri Slaby serial8250_pnp_exit(); 11419196d8acSJiri Slaby unreg_uart_drv: 11429196d8acSJiri Slaby #ifdef CONFIG_SPARC 11439196d8acSJiri Slaby sunserial_unregister_minors(&serial8250_reg, UART_NR); 11449196d8acSJiri Slaby #else 11459196d8acSJiri Slaby uart_unregister_driver(&serial8250_reg); 11469196d8acSJiri Slaby #endif 11479196d8acSJiri Slaby out: 11489196d8acSJiri Slaby return ret; 11499196d8acSJiri Slaby } 11509196d8acSJiri Slaby 11519196d8acSJiri Slaby static void __exit serial8250_exit(void) 11529196d8acSJiri Slaby { 11539196d8acSJiri Slaby struct platform_device *isa_dev = serial8250_isa_devs; 11549196d8acSJiri Slaby 11559196d8acSJiri Slaby /* 11569196d8acSJiri Slaby * This tells serial8250_unregister_port() not to re-register 11579196d8acSJiri Slaby * the ports (thereby making serial8250_isa_driver permanently 11589196d8acSJiri Slaby * in use.) 11599196d8acSJiri Slaby */ 11609196d8acSJiri Slaby serial8250_isa_devs = NULL; 11619196d8acSJiri Slaby 11629196d8acSJiri Slaby platform_driver_unregister(&serial8250_isa_driver); 11639196d8acSJiri Slaby platform_device_unregister(isa_dev); 11649196d8acSJiri Slaby 11659196d8acSJiri Slaby serial8250_pnp_exit(); 11669196d8acSJiri Slaby 11679196d8acSJiri Slaby #ifdef CONFIG_SPARC 11689196d8acSJiri Slaby sunserial_unregister_minors(&serial8250_reg, UART_NR); 11699196d8acSJiri Slaby #else 11709196d8acSJiri Slaby uart_unregister_driver(&serial8250_reg); 11719196d8acSJiri Slaby #endif 11729196d8acSJiri Slaby } 11739196d8acSJiri Slaby 11749196d8acSJiri Slaby module_init(serial8250_init); 11759196d8acSJiri Slaby module_exit(serial8250_exit); 11769196d8acSJiri Slaby 11779196d8acSJiri Slaby MODULE_LICENSE("GPL"); 11789196d8acSJiri Slaby MODULE_DESCRIPTION("Generic 8250/16x50 serial driver"); 11799196d8acSJiri Slaby 11809196d8acSJiri Slaby module_param(share_irqs, uint, 0644); 11819196d8acSJiri Slaby MODULE_PARM_DESC(share_irqs, "Share IRQs with other non-8250/16x50 devices" 11829196d8acSJiri Slaby " (unsafe)"); 11839196d8acSJiri Slaby 11849196d8acSJiri Slaby module_param(nr_uarts, uint, 0644); 11859196d8acSJiri Slaby MODULE_PARM_DESC(nr_uarts, "Maximum number of UARTs supported. (1-" __MODULE_STRING(CONFIG_SERIAL_8250_NR_UARTS) ")"); 11869196d8acSJiri Slaby 11879196d8acSJiri Slaby module_param(skip_txen_test, uint, 0644); 11889196d8acSJiri Slaby MODULE_PARM_DESC(skip_txen_test, "Skip checking for the TXEN bug at init time"); 11899196d8acSJiri Slaby 11909196d8acSJiri Slaby #ifdef CONFIG_SERIAL_8250_RSA 11919196d8acSJiri Slaby module_param_array(probe_rsa, ulong, &probe_rsa_count, 0444); 11929196d8acSJiri Slaby MODULE_PARM_DESC(probe_rsa, "Probe I/O ports for RSA"); 11939196d8acSJiri Slaby #endif 11949196d8acSJiri Slaby MODULE_ALIAS_CHARDEV_MAJOR(TTY_MAJOR); 11959196d8acSJiri Slaby 11969326b047SJiri Slaby #ifdef CONFIG_SERIAL_8250_DEPRECATED_OPTIONS 11979196d8acSJiri Slaby #ifndef MODULE 11989196d8acSJiri Slaby /* This module was renamed to 8250_core in 3.7. Keep the old "8250" name 11999196d8acSJiri Slaby * working as well for the module options so we don't break people. We 12009196d8acSJiri Slaby * need to keep the names identical and the convenient macros will happily 12019196d8acSJiri Slaby * refuse to let us do that by failing the build with redefinition errors 12029196d8acSJiri Slaby * of global variables. So we stick them inside a dummy function to avoid 12039196d8acSJiri Slaby * those conflicts. The options still get parsed, and the redefined 12049196d8acSJiri Slaby * MODULE_PARAM_PREFIX lets us keep the "8250." syntax alive. 12059196d8acSJiri Slaby * 12069196d8acSJiri Slaby * This is hacky. I'm sorry. 12079196d8acSJiri Slaby */ 12089196d8acSJiri Slaby static void __used s8250_options(void) 12099196d8acSJiri Slaby { 12109196d8acSJiri Slaby #undef MODULE_PARAM_PREFIX 12119196d8acSJiri Slaby #define MODULE_PARAM_PREFIX "8250_core." 12129196d8acSJiri Slaby 12139196d8acSJiri Slaby module_param_cb(share_irqs, ¶m_ops_uint, &share_irqs, 0644); 12149196d8acSJiri Slaby module_param_cb(nr_uarts, ¶m_ops_uint, &nr_uarts, 0644); 12159196d8acSJiri Slaby module_param_cb(skip_txen_test, ¶m_ops_uint, &skip_txen_test, 0644); 12169196d8acSJiri Slaby #ifdef CONFIG_SERIAL_8250_RSA 12179196d8acSJiri Slaby __module_param_call(MODULE_PARAM_PREFIX, probe_rsa, 12189196d8acSJiri Slaby ¶m_array_ops, .arr = &__param_arr_probe_rsa, 121991f9d330SJani Nikula 0444, -1, 0); 12209196d8acSJiri Slaby #endif 12219196d8acSJiri Slaby } 12229196d8acSJiri Slaby #else 12239196d8acSJiri Slaby MODULE_ALIAS("8250_core"); 12249196d8acSJiri Slaby #endif 12259326b047SJiri Slaby #endif 1226