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 */
serial8250_interrupt(int irq,void * dev_id)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 */
serial_do_unlink(struct irq_info * i,struct uart_8250_port * up)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
serial_link_irq_chain(struct uart_8250_port * up)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
serial_unlink_irq_chain(struct uart_8250_port * up)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 */
serial8250_timeout(struct timer_list * t)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
serial8250_backup_timeout(struct timer_list * t)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
univ8250_setup_timer(struct uart_8250_port * up)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
univ8250_setup_irq(struct uart_8250_port * up)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
univ8250_release_irq(struct uart_8250_port * up)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
serial8250_request_rsa_resource(struct uart_8250_port * up)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
serial8250_release_rsa_resource(struct uart_8250_port * up)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 */
serial8250_get_port(int line)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
serial8250_set_isa_configurator(void (* v)(int port,struct uart_port * up,u32 * capabilities))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
univ8250_config_port(struct uart_port * port,int flags)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
univ8250_request_port(struct uart_port * port)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
univ8250_release_port(struct uart_port * port)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
univ8250_rsa_support(struct uart_ops * ops)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
serial8250_apply_quirks(struct uart_8250_port * up)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
serial8250_setup_port(int index)4919d86719fSTony Lindgren static struct uart_8250_port *serial8250_setup_port(int index)
4929d86719fSTony Lindgren {
4939d86719fSTony Lindgren struct uart_8250_port *up;
4949d86719fSTony Lindgren
4959d86719fSTony Lindgren if (index >= UART_NR)
4969d86719fSTony Lindgren return NULL;
4979d86719fSTony Lindgren
4989d86719fSTony Lindgren up = &serial8250_ports[index];
4999d86719fSTony Lindgren up->port.line = index;
500d962de6aSTony Lindgren up->port.port_id = index;
5019d86719fSTony Lindgren
5029d86719fSTony Lindgren serial8250_init_port(up);
5039d86719fSTony Lindgren if (!base_ops)
5049d86719fSTony Lindgren base_ops = up->port.ops;
5059d86719fSTony Lindgren up->port.ops = &univ8250_port_ops;
5069d86719fSTony Lindgren
5079d86719fSTony Lindgren timer_setup(&up->timer, serial8250_timeout, 0);
5089d86719fSTony Lindgren
5099d86719fSTony Lindgren up->ops = &univ8250_driver_ops;
5109d86719fSTony Lindgren
5119d86719fSTony Lindgren if (IS_ENABLED(CONFIG_ALPHA_JENSEN) ||
5129d86719fSTony Lindgren (IS_ENABLED(CONFIG_ALPHA_GENERIC) && alpha_jensen()))
5139d86719fSTony Lindgren up->port.set_mctrl = alpha_jensen_set_mctrl;
5149d86719fSTony Lindgren
5159d86719fSTony Lindgren serial8250_set_defaults(up);
5169d86719fSTony Lindgren
5179d86719fSTony Lindgren return up;
5189d86719fSTony Lindgren }
5199d86719fSTony Lindgren
serial8250_isa_init_ports(void)5209196d8acSJiri Slaby static void __init serial8250_isa_init_ports(void)
5219196d8acSJiri Slaby {
5229196d8acSJiri Slaby struct uart_8250_port *up;
5239196d8acSJiri Slaby static int first = 1;
5249196d8acSJiri Slaby int i, irqflag = 0;
5259196d8acSJiri Slaby
5269196d8acSJiri Slaby if (!first)
5279196d8acSJiri Slaby return;
5289196d8acSJiri Slaby first = 0;
5299196d8acSJiri Slaby
5309196d8acSJiri Slaby if (nr_uarts > UART_NR)
5319196d8acSJiri Slaby nr_uarts = UART_NR;
5329196d8acSJiri Slaby
5339d86719fSTony Lindgren /*
5349d86719fSTony Lindgren * Set up initial isa ports based on nr_uart module param, or else
5359d86719fSTony Lindgren * default to CONFIG_SERIAL_8250_RUNTIME_UARTS. Note that we do not
5369d86719fSTony Lindgren * need to increase nr_uarts when setting up the initial isa ports.
5379d86719fSTony Lindgren */
5389d86719fSTony Lindgren for (i = 0; i < nr_uarts; i++)
5399d86719fSTony Lindgren serial8250_setup_port(i);
5409196d8acSJiri Slaby
54140375393SPeter Hurley /* chain base port ops to support Remote Supervisor Adapter */
54240375393SPeter Hurley univ8250_port_ops = *base_ops;
54340375393SPeter Hurley univ8250_rsa_support(&univ8250_port_ops);
54440375393SPeter Hurley
5459196d8acSJiri Slaby if (share_irqs)
5469196d8acSJiri Slaby irqflag = IRQF_SHARED;
5479196d8acSJiri Slaby
5489196d8acSJiri Slaby for (i = 0, up = serial8250_ports;
5499196d8acSJiri Slaby i < ARRAY_SIZE(old_serial_port) && i < nr_uarts;
5509196d8acSJiri Slaby i++, up++) {
5519196d8acSJiri Slaby struct uart_port *port = &up->port;
5529196d8acSJiri Slaby
5539196d8acSJiri Slaby port->iobase = old_serial_port[i].port;
5549196d8acSJiri Slaby port->irq = irq_canonicalize(old_serial_port[i].irq);
555b0f8aed2SJiri Slaby port->irqflags = 0;
5569196d8acSJiri Slaby port->uartclk = old_serial_port[i].baud_base * 16;
5579196d8acSJiri Slaby port->flags = old_serial_port[i].flags;
558b0f8aed2SJiri Slaby port->hub6 = 0;
5599196d8acSJiri Slaby port->membase = old_serial_port[i].iomem_base;
5609196d8acSJiri Slaby port->iotype = old_serial_port[i].io_type;
5619196d8acSJiri Slaby port->regshift = old_serial_port[i].iomem_reg_shift;
5621a53e079SPeter Hurley
5639196d8acSJiri Slaby port->irqflags |= irqflag;
5649196d8acSJiri Slaby if (serial8250_isa_config != NULL)
5659196d8acSJiri Slaby serial8250_isa_config(i, &up->port, &up->capabilities);
5669196d8acSJiri Slaby }
5679196d8acSJiri Slaby }
5689196d8acSJiri Slaby
5699196d8acSJiri Slaby static void __init
serial8250_register_ports(struct uart_driver * drv,struct device * dev)5709196d8acSJiri Slaby serial8250_register_ports(struct uart_driver *drv, struct device *dev)
5719196d8acSJiri Slaby {
5729196d8acSJiri Slaby int i;
5739196d8acSJiri Slaby
5749196d8acSJiri Slaby for (i = 0; i < nr_uarts; i++) {
5759196d8acSJiri Slaby struct uart_8250_port *up = &serial8250_ports[i];
5769196d8acSJiri Slaby
577e4fda3a0SMaciej S. Szmigiero if (up->port.type == PORT_8250_CIR)
578e4fda3a0SMaciej S. Szmigiero continue;
579e4fda3a0SMaciej S. Szmigiero
5809196d8acSJiri Slaby if (up->port.dev)
5819196d8acSJiri Slaby continue;
5829196d8acSJiri Slaby
5839196d8acSJiri Slaby up->port.dev = dev;
5849196d8acSJiri Slaby
585452b9b24SJohn Ogness if (uart_console_registered(&up->port))
586f9b11229SIlpo Järvinen pm_runtime_get_sync(up->port.dev);
587f9b11229SIlpo Järvinen
588c7ac15ceSAndy Shevchenko serial8250_apply_quirks(up);
5899196d8acSJiri Slaby uart_add_one_port(drv, &up->port);
5909196d8acSJiri Slaby }
5919196d8acSJiri Slaby }
5929196d8acSJiri Slaby
5939196d8acSJiri Slaby #ifdef CONFIG_SERIAL_8250_CONSOLE
5949196d8acSJiri Slaby
univ8250_console_write(struct console * co,const char * s,unsigned int count)5956e281571SPeter Hurley static void univ8250_console_write(struct console *co, const char *s,
5966e281571SPeter Hurley unsigned int count)
5979196d8acSJiri Slaby {
5986e281571SPeter Hurley struct uart_8250_port *up = &serial8250_ports[co->index];
5996e281571SPeter Hurley
6006e281571SPeter Hurley serial8250_console_write(up, s, count);
6016e281571SPeter Hurley }
6026e281571SPeter Hurley
univ8250_console_setup(struct console * co,char * options)6036e281571SPeter Hurley static int univ8250_console_setup(struct console *co, char *options)
6046e281571SPeter Hurley {
6059d86719fSTony Lindgren struct uart_8250_port *up;
60687515772SPeter Hurley struct uart_port *port;
6079d86719fSTony Lindgren int retval, i;
6086e281571SPeter Hurley
6099196d8acSJiri Slaby /*
6109196d8acSJiri Slaby * Check whether an invalid uart number has been specified, and
6119196d8acSJiri Slaby * if so, search for the first available port that does have
6129196d8acSJiri Slaby * console support.
6139196d8acSJiri Slaby */
6149d86719fSTony Lindgren if (co->index >= UART_NR)
6159196d8acSJiri Slaby co->index = 0;
6169d86719fSTony Lindgren
6179d86719fSTony Lindgren /*
6189d86719fSTony Lindgren * If the console is past the initial isa ports, init more ports up to
6199d86719fSTony Lindgren * co->index as needed and increment nr_uarts accordingly.
6209d86719fSTony Lindgren */
6219d86719fSTony Lindgren for (i = nr_uarts; i <= co->index; i++) {
6229d86719fSTony Lindgren up = serial8250_setup_port(i);
6239d86719fSTony Lindgren if (!up)
6249d86719fSTony Lindgren return -ENODEV;
6259d86719fSTony Lindgren nr_uarts++;
6269d86719fSTony Lindgren }
6279d86719fSTony Lindgren
62887515772SPeter Hurley port = &serial8250_ports[co->index].port;
6296e281571SPeter Hurley /* link port to console */
63087515772SPeter Hurley port->cons = co;
6319196d8acSJiri Slaby
632d70a7b16SPeter Hurley retval = serial8250_console_setup(port, options, false);
633d70a7b16SPeter Hurley if (retval != 0)
634d70a7b16SPeter Hurley port->cons = NULL;
635d70a7b16SPeter Hurley return retval;
6369196d8acSJiri Slaby }
6379196d8acSJiri Slaby
univ8250_console_exit(struct console * co)638bedb404eSAndy Shevchenko static int univ8250_console_exit(struct console *co)
639bedb404eSAndy Shevchenko {
640bedb404eSAndy Shevchenko struct uart_port *port;
641bedb404eSAndy Shevchenko
642bedb404eSAndy Shevchenko port = &serial8250_ports[co->index].port;
643bedb404eSAndy Shevchenko return serial8250_console_exit(port);
644bedb404eSAndy Shevchenko }
645bedb404eSAndy Shevchenko
646c7cef0a8SPeter Hurley /**
6476e281571SPeter Hurley * univ8250_console_match - non-standard console matching
648c7cef0a8SPeter Hurley * @co: registering console
649c7cef0a8SPeter Hurley * @name: name from console command line
650c7cef0a8SPeter Hurley * @idx: index from console command line
651c7cef0a8SPeter Hurley * @options: ptr to option string from console command line
652c7cef0a8SPeter Hurley *
653c7cef0a8SPeter Hurley * Only attempts to match console command lines of the form:
654bd94c407SMasahiro Yamada * console=uart[8250],io|mmio|mmio16|mmio32,<addr>[,<options>]
655ca782f16SPeter Hurley * console=uart[8250],0x<addr>[,<options>]
656c7cef0a8SPeter Hurley * This form is used to register an initial earlycon boot console and
657c7cef0a8SPeter Hurley * replace it with the serial8250_console at 8250 driver init.
658c7cef0a8SPeter Hurley *
659c7cef0a8SPeter Hurley * Performs console setup for a match (as required by interface)
660ca782f16SPeter Hurley * If no <options> are specified, then assume the h/w is already setup.
661c7cef0a8SPeter Hurley *
662c7cef0a8SPeter Hurley * Returns 0 if console matches; otherwise non-zero to use default matching
663c7cef0a8SPeter Hurley */
univ8250_console_match(struct console * co,char * name,int idx,char * options)6646e281571SPeter Hurley static int univ8250_console_match(struct console *co, char *name, int idx,
665c7cef0a8SPeter Hurley char *options)
6669196d8acSJiri Slaby {
667c7cef0a8SPeter Hurley char match[] = "uart"; /* 8250-specific earlycon name */
668c7cef0a8SPeter Hurley unsigned char iotype;
66946e36683SAlexander Sverdlin resource_size_t addr;
670c7cef0a8SPeter Hurley int i;
671c7cef0a8SPeter Hurley
672c7cef0a8SPeter Hurley if (strncmp(name, match, 4) != 0)
673c7cef0a8SPeter Hurley return -ENODEV;
674c7cef0a8SPeter Hurley
675c7cef0a8SPeter Hurley if (uart_parse_earlycon(options, &iotype, &addr, &options))
676c7cef0a8SPeter Hurley return -ENODEV;
677c7cef0a8SPeter Hurley
678c7cef0a8SPeter Hurley /* try to match the port specified on the command line */
679c7cef0a8SPeter Hurley for (i = 0; i < nr_uarts; i++) {
680c7cef0a8SPeter Hurley struct uart_port *port = &serial8250_ports[i].port;
681c7cef0a8SPeter Hurley
682c7cef0a8SPeter Hurley if (port->iotype != iotype)
683c7cef0a8SPeter Hurley continue;
684bd94c407SMasahiro Yamada if ((iotype == UPIO_MEM || iotype == UPIO_MEM16 ||
685bd94c407SMasahiro Yamada iotype == UPIO_MEM32 || iotype == UPIO_MEM32BE)
686bd94c407SMasahiro Yamada && (port->mapbase != addr))
687c7cef0a8SPeter Hurley continue;
688c7cef0a8SPeter Hurley if (iotype == UPIO_PORT && port->iobase != addr)
689c7cef0a8SPeter Hurley continue;
690c7cef0a8SPeter Hurley
691c7cef0a8SPeter Hurley co->index = i;
69287515772SPeter Hurley port->cons = co;
69387515772SPeter Hurley return serial8250_console_setup(port, options, true);
694c7cef0a8SPeter Hurley }
695c7cef0a8SPeter Hurley
696c7cef0a8SPeter Hurley return -ENODEV;
6979196d8acSJiri Slaby }
6989196d8acSJiri Slaby
6996e281571SPeter Hurley static struct console univ8250_console = {
7009196d8acSJiri Slaby .name = "ttyS",
7016e281571SPeter Hurley .write = univ8250_console_write,
7029196d8acSJiri Slaby .device = uart_console_device,
7036e281571SPeter Hurley .setup = univ8250_console_setup,
704bedb404eSAndy Shevchenko .exit = univ8250_console_exit,
7056e281571SPeter Hurley .match = univ8250_console_match,
7066741f551SHerbert Xu .flags = CON_PRINTBUFFER | CON_ANYTIME,
7079196d8acSJiri Slaby .index = -1,
7089196d8acSJiri Slaby .data = &serial8250_reg,
7099196d8acSJiri Slaby };
7109196d8acSJiri Slaby
univ8250_console_init(void)7116e281571SPeter Hurley static int __init univ8250_console_init(void)
7129196d8acSJiri Slaby {
71359cfc45fSJan Kiszka if (nr_uarts == 0)
71459cfc45fSJan Kiszka return -ENODEV;
71559cfc45fSJan Kiszka
7169196d8acSJiri Slaby serial8250_isa_init_ports();
7176e281571SPeter Hurley register_console(&univ8250_console);
7189196d8acSJiri Slaby return 0;
7199196d8acSJiri Slaby }
7206e281571SPeter Hurley console_initcall(univ8250_console_init);
7219196d8acSJiri Slaby
722149a44ccSAnton Wuerfel #define SERIAL8250_CONSOLE (&univ8250_console)
7239196d8acSJiri Slaby #else
7249196d8acSJiri Slaby #define SERIAL8250_CONSOLE NULL
7259196d8acSJiri Slaby #endif
7269196d8acSJiri Slaby
7279196d8acSJiri Slaby static struct uart_driver serial8250_reg = {
7289196d8acSJiri Slaby .owner = THIS_MODULE,
7299196d8acSJiri Slaby .driver_name = "serial",
7309196d8acSJiri Slaby .dev_name = "ttyS",
7319196d8acSJiri Slaby .major = TTY_MAJOR,
7329196d8acSJiri Slaby .minor = 64,
7339196d8acSJiri Slaby .cons = SERIAL8250_CONSOLE,
7349196d8acSJiri Slaby };
7359196d8acSJiri Slaby
7369196d8acSJiri Slaby /*
7379196d8acSJiri Slaby * early_serial_setup - early registration for 8250 ports
7389196d8acSJiri Slaby *
7399196d8acSJiri Slaby * Setup an 8250 port structure prior to console initialisation. Use
7409196d8acSJiri Slaby * after console initialisation will cause undefined behaviour.
7419196d8acSJiri Slaby */
early_serial_setup(struct uart_port * port)7429196d8acSJiri Slaby int __init early_serial_setup(struct uart_port *port)
7439196d8acSJiri Slaby {
7449196d8acSJiri Slaby struct uart_port *p;
7459196d8acSJiri Slaby
74659cfc45fSJan Kiszka if (port->line >= ARRAY_SIZE(serial8250_ports) || nr_uarts == 0)
7479196d8acSJiri Slaby return -ENODEV;
7489196d8acSJiri Slaby
7499196d8acSJiri Slaby serial8250_isa_init_ports();
7509196d8acSJiri Slaby p = &serial8250_ports[port->line].port;
7519196d8acSJiri Slaby p->iobase = port->iobase;
7529196d8acSJiri Slaby p->membase = port->membase;
7539196d8acSJiri Slaby p->irq = port->irq;
7549196d8acSJiri Slaby p->irqflags = port->irqflags;
7559196d8acSJiri Slaby p->uartclk = port->uartclk;
7569196d8acSJiri Slaby p->fifosize = port->fifosize;
7579196d8acSJiri Slaby p->regshift = port->regshift;
7589196d8acSJiri Slaby p->iotype = port->iotype;
7599196d8acSJiri Slaby p->flags = port->flags;
7609196d8acSJiri Slaby p->mapbase = port->mapbase;
761ee97d0e3SMans Rullgard p->mapsize = port->mapsize;
7629196d8acSJiri Slaby p->private_data = port->private_data;
7639196d8acSJiri Slaby p->type = port->type;
7649196d8acSJiri Slaby p->line = port->line;
7659196d8acSJiri Slaby
7661a53e079SPeter Hurley serial8250_set_defaults(up_to_u8250p(p));
7671a53e079SPeter Hurley
7689196d8acSJiri Slaby if (port->serial_in)
7699196d8acSJiri Slaby p->serial_in = port->serial_in;
7709196d8acSJiri Slaby if (port->serial_out)
7719196d8acSJiri Slaby p->serial_out = port->serial_out;
7729196d8acSJiri Slaby if (port->handle_irq)
7739196d8acSJiri Slaby p->handle_irq = port->handle_irq;
7749196d8acSJiri Slaby
7759196d8acSJiri Slaby return 0;
7769196d8acSJiri Slaby }
7779196d8acSJiri Slaby
7789196d8acSJiri Slaby /**
7799196d8acSJiri Slaby * serial8250_suspend_port - suspend one serial port
7809196d8acSJiri Slaby * @line: serial line number
7819196d8acSJiri Slaby *
7829196d8acSJiri Slaby * Suspend one serial port.
7839196d8acSJiri Slaby */
serial8250_suspend_port(int line)7849196d8acSJiri Slaby void serial8250_suspend_port(int line)
7859196d8acSJiri Slaby {
7864516d50aSPeter Hurley struct uart_8250_port *up = &serial8250_ports[line];
7874516d50aSPeter Hurley struct uart_port *port = &up->port;
7884516d50aSPeter Hurley
7894516d50aSPeter Hurley if (!console_suspend_enabled && uart_console(port) &&
7904516d50aSPeter Hurley port->type != PORT_8250) {
7914516d50aSPeter Hurley unsigned char canary = 0xa5;
79226f75916SChristophe JAILLET
7934516d50aSPeter Hurley serial_out(up, UART_SCR, canary);
794f01a0bd8SPeter Hurley if (serial_in(up, UART_SCR) == canary)
7954516d50aSPeter Hurley up->canary = canary;
7964516d50aSPeter Hurley }
7974516d50aSPeter Hurley
7984516d50aSPeter Hurley uart_suspend_port(&serial8250_reg, port);
7999196d8acSJiri Slaby }
800b34f9fafSAnton Wuerfel EXPORT_SYMBOL(serial8250_suspend_port);
8019196d8acSJiri Slaby
8029196d8acSJiri Slaby /**
8039196d8acSJiri Slaby * serial8250_resume_port - resume one serial port
8049196d8acSJiri Slaby * @line: serial line number
8059196d8acSJiri Slaby *
8069196d8acSJiri Slaby * Resume one serial port.
8079196d8acSJiri Slaby */
serial8250_resume_port(int line)8089196d8acSJiri Slaby void serial8250_resume_port(int line)
8099196d8acSJiri Slaby {
8109196d8acSJiri Slaby struct uart_8250_port *up = &serial8250_ports[line];
8119196d8acSJiri Slaby struct uart_port *port = &up->port;
8129196d8acSJiri Slaby
8134516d50aSPeter Hurley up->canary = 0;
8144516d50aSPeter Hurley
8159196d8acSJiri Slaby if (up->capabilities & UART_NATSEMI) {
8169196d8acSJiri Slaby /* Ensure it's still in high speed mode */
8179196d8acSJiri Slaby serial_port_out(port, UART_LCR, 0xE0);
8189196d8acSJiri Slaby
8199196d8acSJiri Slaby ns16550a_goto_highspeed(up);
8209196d8acSJiri Slaby
8219196d8acSJiri Slaby serial_port_out(port, UART_LCR, 0);
8229196d8acSJiri Slaby port->uartclk = 921600*16;
8239196d8acSJiri Slaby }
8249196d8acSJiri Slaby uart_resume_port(&serial8250_reg, port);
8259196d8acSJiri Slaby }
826b34f9fafSAnton Wuerfel EXPORT_SYMBOL(serial8250_resume_port);
8279196d8acSJiri Slaby
8289196d8acSJiri Slaby /*
8299196d8acSJiri Slaby * Register a set of serial devices attached to a platform device. The
8309196d8acSJiri Slaby * list is terminated with a zero flags entry, which means we expect
8319196d8acSJiri Slaby * all entries to have at least UPF_BOOT_AUTOCONF set.
8329196d8acSJiri Slaby */
serial8250_probe(struct platform_device * dev)8339196d8acSJiri Slaby static int serial8250_probe(struct platform_device *dev)
8349196d8acSJiri Slaby {
835574de559SJingoo Han struct plat_serial8250_port *p = dev_get_platdata(&dev->dev);
8369196d8acSJiri Slaby struct uart_8250_port uart;
8379196d8acSJiri Slaby int ret, i, irqflag = 0;
8389196d8acSJiri Slaby
8399196d8acSJiri Slaby memset(&uart, 0, sizeof(uart));
8409196d8acSJiri Slaby
8419196d8acSJiri Slaby if (share_irqs)
8429196d8acSJiri Slaby irqflag = IRQF_SHARED;
8439196d8acSJiri Slaby
8449196d8acSJiri Slaby for (i = 0; p && p->flags != 0; p++, i++) {
8459196d8acSJiri Slaby uart.port.iobase = p->iobase;
8469196d8acSJiri Slaby uart.port.membase = p->membase;
8479196d8acSJiri Slaby uart.port.irq = p->irq;
8489196d8acSJiri Slaby uart.port.irqflags = p->irqflags;
8499196d8acSJiri Slaby uart.port.uartclk = p->uartclk;
8509196d8acSJiri Slaby uart.port.regshift = p->regshift;
8519196d8acSJiri Slaby uart.port.iotype = p->iotype;
8529196d8acSJiri Slaby uart.port.flags = p->flags;
8539196d8acSJiri Slaby uart.port.mapbase = p->mapbase;
85430c61f53SIlpo Järvinen uart.port.mapsize = p->mapsize;
8559196d8acSJiri Slaby uart.port.hub6 = p->hub6;
856d68fefddSDmitry Safonov uart.port.has_sysrq = p->has_sysrq;
8579196d8acSJiri Slaby uart.port.private_data = p->private_data;
8589196d8acSJiri Slaby uart.port.type = p->type;
85930c61f53SIlpo Järvinen uart.bugs = p->bugs;
8609196d8acSJiri Slaby uart.port.serial_in = p->serial_in;
8619196d8acSJiri Slaby uart.port.serial_out = p->serial_out;
86230c61f53SIlpo Järvinen uart.dl_read = p->dl_read;
86330c61f53SIlpo Järvinen uart.dl_write = p->dl_write;
8649196d8acSJiri Slaby uart.port.handle_irq = p->handle_irq;
8659196d8acSJiri Slaby uart.port.handle_break = p->handle_break;
8669196d8acSJiri Slaby uart.port.set_termios = p->set_termios;
867db405a8fSEd Blake uart.port.set_ldisc = p->set_ldisc;
868144ef5c2SWan Ahmad Zainie uart.port.get_mctrl = p->get_mctrl;
8699196d8acSJiri Slaby uart.port.pm = p->pm;
8709196d8acSJiri Slaby uart.port.dev = &dev->dev;
8719196d8acSJiri Slaby uart.port.irqflags |= irqflag;
8729196d8acSJiri Slaby ret = serial8250_register_8250_port(&uart);
8739196d8acSJiri Slaby if (ret < 0) {
8749196d8acSJiri Slaby dev_err(&dev->dev, "unable to register port at index %d "
8759196d8acSJiri Slaby "(IO%lx MEM%llx IRQ%d): %d\n", i,
8769196d8acSJiri Slaby p->iobase, (unsigned long long)p->mapbase,
8779196d8acSJiri Slaby p->irq, ret);
8789196d8acSJiri Slaby }
8799196d8acSJiri Slaby }
8809196d8acSJiri Slaby return 0;
8819196d8acSJiri Slaby }
8829196d8acSJiri Slaby
8839196d8acSJiri Slaby /*
8849196d8acSJiri Slaby * Remove serial ports registered against a platform device.
8859196d8acSJiri Slaby */
serial8250_remove(struct platform_device * dev)8869196d8acSJiri Slaby static int serial8250_remove(struct platform_device *dev)
8879196d8acSJiri Slaby {
8889196d8acSJiri Slaby int i;
8899196d8acSJiri Slaby
890317a6842SKyle McMartin for (i = 0; i < nr_uarts; i++) {
8919196d8acSJiri Slaby struct uart_8250_port *up = &serial8250_ports[i];
8929196d8acSJiri Slaby
8939196d8acSJiri Slaby if (up->port.dev == &dev->dev)
8949196d8acSJiri Slaby serial8250_unregister_port(i);
8959196d8acSJiri Slaby }
8969196d8acSJiri Slaby return 0;
8979196d8acSJiri Slaby }
8989196d8acSJiri Slaby
serial8250_suspend(struct platform_device * dev,pm_message_t state)8999196d8acSJiri Slaby static int serial8250_suspend(struct platform_device *dev, pm_message_t state)
9009196d8acSJiri Slaby {
9019196d8acSJiri Slaby int i;
9029196d8acSJiri Slaby
9039196d8acSJiri Slaby for (i = 0; i < UART_NR; i++) {
9049196d8acSJiri Slaby struct uart_8250_port *up = &serial8250_ports[i];
9059196d8acSJiri Slaby
9069196d8acSJiri Slaby if (up->port.type != PORT_UNKNOWN && up->port.dev == &dev->dev)
9079196d8acSJiri Slaby uart_suspend_port(&serial8250_reg, &up->port);
9089196d8acSJiri Slaby }
9099196d8acSJiri Slaby
9109196d8acSJiri Slaby return 0;
9119196d8acSJiri Slaby }
9129196d8acSJiri Slaby
serial8250_resume(struct platform_device * dev)9139196d8acSJiri Slaby static int serial8250_resume(struct platform_device *dev)
9149196d8acSJiri Slaby {
9159196d8acSJiri Slaby int i;
9169196d8acSJiri Slaby
9179196d8acSJiri Slaby for (i = 0; i < UART_NR; i++) {
9189196d8acSJiri Slaby struct uart_8250_port *up = &serial8250_ports[i];
9199196d8acSJiri Slaby
9209196d8acSJiri Slaby if (up->port.type != PORT_UNKNOWN && up->port.dev == &dev->dev)
9219196d8acSJiri Slaby serial8250_resume_port(i);
9229196d8acSJiri Slaby }
9239196d8acSJiri Slaby
9249196d8acSJiri Slaby return 0;
9259196d8acSJiri Slaby }
9269196d8acSJiri Slaby
9279196d8acSJiri Slaby static struct platform_driver serial8250_isa_driver = {
9289196d8acSJiri Slaby .probe = serial8250_probe,
9299196d8acSJiri Slaby .remove = serial8250_remove,
9309196d8acSJiri Slaby .suspend = serial8250_suspend,
9319196d8acSJiri Slaby .resume = serial8250_resume,
9329196d8acSJiri Slaby .driver = {
9339196d8acSJiri Slaby .name = "serial8250",
9349196d8acSJiri Slaby },
9359196d8acSJiri Slaby };
9369196d8acSJiri Slaby
9379196d8acSJiri Slaby /*
9389196d8acSJiri Slaby * This "device" covers _all_ ISA 8250-compatible serial devices listed
9399196d8acSJiri Slaby * in the table in include/asm/serial.h
9409196d8acSJiri Slaby */
9419196d8acSJiri Slaby static struct platform_device *serial8250_isa_devs;
9429196d8acSJiri Slaby
9439196d8acSJiri Slaby /*
9449196d8acSJiri Slaby * serial8250_register_8250_port and serial8250_unregister_port allows for
9459196d8acSJiri Slaby * 16x50 serial ports to be configured at run-time, to support PCMCIA
9469196d8acSJiri Slaby * modems and PCI multiport cards.
9479196d8acSJiri Slaby */
9489196d8acSJiri Slaby static DEFINE_MUTEX(serial_mutex);
9499196d8acSJiri Slaby
serial8250_find_match_or_unused(const struct uart_port * port)950cd256b06SJiri Slaby static struct uart_8250_port *serial8250_find_match_or_unused(const struct uart_port *port)
9519196d8acSJiri Slaby {
9529196d8acSJiri Slaby int i;
9539196d8acSJiri Slaby
9549196d8acSJiri Slaby /*
9559196d8acSJiri Slaby * First, find a port entry which matches.
9569196d8acSJiri Slaby */
957317a6842SKyle McMartin for (i = 0; i < nr_uarts; i++)
9589196d8acSJiri Slaby if (uart_match_port(&serial8250_ports[i].port, port))
9599196d8acSJiri Slaby return &serial8250_ports[i];
9609196d8acSJiri Slaby
96159b3e898SSebastian Andrzej Siewior /* try line number first if still available */
96259b3e898SSebastian Andrzej Siewior i = port->line;
96359b3e898SSebastian Andrzej Siewior if (i < nr_uarts && serial8250_ports[i].port.type == PORT_UNKNOWN &&
96459b3e898SSebastian Andrzej Siewior serial8250_ports[i].port.iobase == 0)
96559b3e898SSebastian Andrzej Siewior return &serial8250_ports[i];
9669196d8acSJiri Slaby /*
9679196d8acSJiri Slaby * We didn't find a matching entry, so look for the first
9689196d8acSJiri Slaby * free entry. We look for one which hasn't been previously
9699196d8acSJiri Slaby * used (indicated by zero iobase).
9709196d8acSJiri Slaby */
971317a6842SKyle McMartin for (i = 0; i < nr_uarts; i++)
9729196d8acSJiri Slaby if (serial8250_ports[i].port.type == PORT_UNKNOWN &&
9739196d8acSJiri Slaby serial8250_ports[i].port.iobase == 0)
9749196d8acSJiri Slaby return &serial8250_ports[i];
9759196d8acSJiri Slaby
9769196d8acSJiri Slaby /*
9779196d8acSJiri Slaby * That also failed. Last resort is to find any entry which
9789196d8acSJiri Slaby * doesn't have a real port associated with it.
9799196d8acSJiri Slaby */
980317a6842SKyle McMartin for (i = 0; i < nr_uarts; i++)
9819196d8acSJiri Slaby if (serial8250_ports[i].port.type == PORT_UNKNOWN)
9829196d8acSJiri Slaby return &serial8250_ports[i];
9839196d8acSJiri Slaby
9849196d8acSJiri Slaby return NULL;
9859196d8acSJiri Slaby }
9869196d8acSJiri Slaby
serial_8250_overrun_backoff_work(struct work_struct * work)9876d7f677aSDarwin Dingel static void serial_8250_overrun_backoff_work(struct work_struct *work)
9886d7f677aSDarwin Dingel {
9896d7f677aSDarwin Dingel struct uart_8250_port *up =
9906d7f677aSDarwin Dingel container_of(to_delayed_work(work), struct uart_8250_port,
9916d7f677aSDarwin Dingel overrun_backoff);
9926d7f677aSDarwin Dingel struct uart_port *port = &up->port;
9936d7f677aSDarwin Dingel unsigned long flags;
9946d7f677aSDarwin Dingel
9956d7f677aSDarwin Dingel spin_lock_irqsave(&port->lock, flags);
9966d7f677aSDarwin Dingel up->ier |= UART_IER_RLSI | UART_IER_RDI;
9976d7f677aSDarwin Dingel up->port.read_status_mask |= UART_LSR_DR;
9986d7f677aSDarwin Dingel serial_out(up, UART_IER, up->ier);
9996d7f677aSDarwin Dingel spin_unlock_irqrestore(&port->lock, flags);
10006d7f677aSDarwin Dingel }
10016d7f677aSDarwin Dingel
10029196d8acSJiri Slaby /**
10039196d8acSJiri Slaby * serial8250_register_8250_port - register a serial port
10049196d8acSJiri Slaby * @up: serial port template
10059196d8acSJiri Slaby *
10069196d8acSJiri Slaby * Configure the serial port specified by the request. If the
10079196d8acSJiri Slaby * port exists and is in use, it is hung up and unregistered
10089196d8acSJiri Slaby * first.
10099196d8acSJiri Slaby *
10109196d8acSJiri Slaby * The port is then probed and if necessary the IRQ is autodetected
10119196d8acSJiri Slaby * If this fails an error is returned.
10129196d8acSJiri Slaby *
10139196d8acSJiri Slaby * On success the port is ready to use and the line number is returned.
10149196d8acSJiri Slaby */
serial8250_register_8250_port(const struct uart_8250_port * up)1015cd256b06SJiri Slaby int serial8250_register_8250_port(const struct uart_8250_port *up)
10169196d8acSJiri Slaby {
10179196d8acSJiri Slaby struct uart_8250_port *uart;
10189196d8acSJiri Slaby int ret = -ENOSPC;
10199196d8acSJiri Slaby
10209196d8acSJiri Slaby if (up->port.uartclk == 0)
10219196d8acSJiri Slaby return -EINVAL;
10229196d8acSJiri Slaby
10239196d8acSJiri Slaby mutex_lock(&serial_mutex);
10249196d8acSJiri Slaby
10259196d8acSJiri Slaby uart = serial8250_find_match_or_unused(&up->port);
10269d86719fSTony Lindgren if (!uart) {
10279d86719fSTony Lindgren /*
10289d86719fSTony Lindgren * If the port is past the initial isa ports, initialize a new
10299d86719fSTony Lindgren * port and increment nr_uarts accordingly.
10309d86719fSTony Lindgren */
10319d86719fSTony Lindgren uart = serial8250_setup_port(nr_uarts);
10329d86719fSTony Lindgren if (!uart)
10339d86719fSTony Lindgren goto unlock;
10349d86719fSTony Lindgren nr_uarts++;
10359d86719fSTony Lindgren }
10369d86719fSTony Lindgren
10379d86719fSTony Lindgren if (uart->port.type != PORT_8250_CIR) {
10384a96895fSYegor Yefremov struct mctrl_gpios *gpios;
10394a96895fSYegor Yefremov
10409196d8acSJiri Slaby if (uart->port.dev)
10419196d8acSJiri Slaby uart_remove_one_port(&serial8250_reg, &uart->port);
10429196d8acSJiri Slaby
104384a9582fSTony Lindgren uart->port.ctrl_id = up->port.ctrl_id;
1044d962de6aSTony Lindgren uart->port.port_id = up->port.port_id;
10459196d8acSJiri Slaby uart->port.iobase = up->port.iobase;
10469196d8acSJiri Slaby uart->port.membase = up->port.membase;
10479196d8acSJiri Slaby uart->port.irq = up->port.irq;
10489196d8acSJiri Slaby uart->port.irqflags = up->port.irqflags;
10499196d8acSJiri Slaby uart->port.uartclk = up->port.uartclk;
10509196d8acSJiri Slaby uart->port.fifosize = up->port.fifosize;
10519196d8acSJiri Slaby uart->port.regshift = up->port.regshift;
10529196d8acSJiri Slaby uart->port.iotype = up->port.iotype;
10539196d8acSJiri Slaby uart->port.flags = up->port.flags | UPF_BOOT_AUTOCONF;
10549196d8acSJiri Slaby uart->bugs = up->bugs;
10559196d8acSJiri Slaby uart->port.mapbase = up->port.mapbase;
1056ee97d0e3SMans Rullgard uart->port.mapsize = up->port.mapsize;
10579196d8acSJiri Slaby uart->port.private_data = up->port.private_data;
10589196d8acSJiri Slaby uart->tx_loadsz = up->tx_loadsz;
10599196d8acSJiri Slaby uart->capabilities = up->capabilities;
1060234abab1SSebastian Andrzej Siewior uart->port.throttle = up->port.throttle;
1061234abab1SSebastian Andrzej Siewior uart->port.unthrottle = up->port.unthrottle;
106246c55b4bSRicardo Ribalda Delgado uart->port.rs485_config = up->port.rs485_config;
10638925c31cSIlpo Järvinen uart->port.rs485_supported = up->port.rs485_supported;
106446c55b4bSRicardo Ribalda Delgado uart->port.rs485 = up->port.rs485;
1065058bc104SLukas Wunner uart->rs485_start_tx = up->rs485_start_tx;
1066058bc104SLukas Wunner uart->rs485_stop_tx = up->rs485_stop_tx;
1067507bd6fbSIlpo Järvinen uart->lsr_save_mask = up->lsr_save_mask;
1068d53e1428SPeter Hurley uart->dma = up->dma;
10699196d8acSJiri Slaby
1070ef99f3aeSGreg Kroah-Hartman /* Take tx_loadsz from fifosize if it wasn't set separately */
1071ef99f3aeSGreg Kroah-Hartman if (uart->port.fifosize && !uart->tx_loadsz)
1072ef99f3aeSGreg Kroah-Hartman uart->tx_loadsz = uart->port.fifosize;
1073ef99f3aeSGreg Kroah-Hartman
1074fe7f0fa4SLukas Wunner if (up->port.dev) {
10759196d8acSJiri Slaby uart->port.dev = up->port.dev;
1076c150c0f3SLukas Wunner ret = uart_get_rs485_mode(&uart->port);
1077c150c0f3SLukas Wunner if (ret)
1078c150c0f3SLukas Wunner goto err;
1079fe7f0fa4SLukas Wunner }
10809196d8acSJiri Slaby
10819196d8acSJiri Slaby if (up->port.flags & UPF_FIXED_TYPE)
1082afd483bdSPeter Hurley uart->port.type = up->port.type;
10839196d8acSJiri Slaby
10844a96895fSYegor Yefremov /*
10854a96895fSYegor Yefremov * Only call mctrl_gpio_init(), if the device has no ACPI
10864a96895fSYegor Yefremov * companion device
10874a96895fSYegor Yefremov */
10884a96895fSYegor Yefremov if (!has_acpi_companion(uart->port.dev)) {
10894a96895fSYegor Yefremov gpios = mctrl_gpio_init(&uart->port, 0);
10904a96895fSYegor Yefremov if (IS_ERR(gpios)) {
1091b7a8f766SWei Yongjun ret = PTR_ERR(gpios);
1092e0a851feSLukas Wunner goto err;
10934a96895fSYegor Yefremov } else {
10944a96895fSYegor Yefremov uart->gpios = gpios;
10954a96895fSYegor Yefremov }
10964a96895fSYegor Yefremov }
10974a96895fSYegor Yefremov
10981a53e079SPeter Hurley serial8250_set_defaults(uart);
10991a53e079SPeter Hurley
11009196d8acSJiri Slaby /* Possibly override default I/O functions. */
11019196d8acSJiri Slaby if (up->port.serial_in)
11029196d8acSJiri Slaby uart->port.serial_in = up->port.serial_in;
11039196d8acSJiri Slaby if (up->port.serial_out)
11049196d8acSJiri Slaby uart->port.serial_out = up->port.serial_out;
11059196d8acSJiri Slaby if (up->port.handle_irq)
11069196d8acSJiri Slaby uart->port.handle_irq = up->port.handle_irq;
11079196d8acSJiri Slaby /* Possibly override set_termios call */
11089196d8acSJiri Slaby if (up->port.set_termios)
11099196d8acSJiri Slaby uart->port.set_termios = up->port.set_termios;
1110db405a8fSEd Blake if (up->port.set_ldisc)
1111db405a8fSEd Blake uart->port.set_ldisc = up->port.set_ldisc;
1112144ef5c2SWan Ahmad Zainie if (up->port.get_mctrl)
1113144ef5c2SWan Ahmad Zainie uart->port.get_mctrl = up->port.get_mctrl;
11144bf4ea9dSPeter Hurley if (up->port.set_mctrl)
11154bf4ea9dSPeter Hurley uart->port.set_mctrl = up->port.set_mctrl;
11160238d2b4SJisheng Zhang if (up->port.get_divisor)
11170238d2b4SJisheng Zhang uart->port.get_divisor = up->port.get_divisor;
11180238d2b4SJisheng Zhang if (up->port.set_divisor)
11190238d2b4SJisheng Zhang uart->port.set_divisor = up->port.set_divisor;
1120b99b121bSSebastian Andrzej Siewior if (up->port.startup)
1121b99b121bSSebastian Andrzej Siewior uart->port.startup = up->port.startup;
1122b99b121bSSebastian Andrzej Siewior if (up->port.shutdown)
1123b99b121bSSebastian Andrzej Siewior uart->port.shutdown = up->port.shutdown;
11249196d8acSJiri Slaby if (up->port.pm)
11259196d8acSJiri Slaby uart->port.pm = up->port.pm;
11269196d8acSJiri Slaby if (up->port.handle_break)
11279196d8acSJiri Slaby uart->port.handle_break = up->port.handle_break;
11289196d8acSJiri Slaby if (up->dl_read)
11299196d8acSJiri Slaby uart->dl_read = up->dl_read;
11309196d8acSJiri Slaby if (up->dl_write)
11319196d8acSJiri Slaby uart->dl_write = up->dl_write;
11329196d8acSJiri Slaby
11339527b82aSSean Young if (uart->port.type != PORT_8250_CIR) {
11349196d8acSJiri Slaby if (serial8250_isa_config != NULL)
11359196d8acSJiri Slaby serial8250_isa_config(0, &uart->port,
11369196d8acSJiri Slaby &uart->capabilities);
11379196d8acSJiri Slaby
1138c7ac15ceSAndy Shevchenko serial8250_apply_quirks(uart);
11399527b82aSSean Young ret = uart_add_one_port(&serial8250_reg,
11409527b82aSSean Young &uart->port);
1141e0a851feSLukas Wunner if (ret)
1142e0a851feSLukas Wunner goto err;
1143e0a851feSLukas Wunner
11449196d8acSJiri Slaby ret = uart->port.line;
11459527b82aSSean Young } else {
11469527b82aSSean Young dev_info(uart->port.dev,
11479527b82aSSean Young "skipping CIR port at 0x%lx / 0x%llx, IRQ %d\n",
11489527b82aSSean Young uart->port.iobase,
11499527b82aSSean Young (unsigned long long)uart->port.mapbase,
11509527b82aSSean Young uart->port.irq);
11519527b82aSSean Young
11529527b82aSSean Young ret = 0;
11539527b82aSSean Young }
11546d7f677aSDarwin Dingel
1155507bd6fbSIlpo Järvinen if (!uart->lsr_save_mask)
1156507bd6fbSIlpo Järvinen uart->lsr_save_mask = LSR_SAVE_FLAGS; /* Use default LSR mask */
1157507bd6fbSIlpo Järvinen
11586d7f677aSDarwin Dingel /* Initialise interrupt backoff work if required */
11596d7f677aSDarwin Dingel if (up->overrun_backoff_time_ms > 0) {
1160352c4cf4SHe Zhe uart->overrun_backoff_time_ms =
1161352c4cf4SHe Zhe up->overrun_backoff_time_ms;
11626d7f677aSDarwin Dingel INIT_DELAYED_WORK(&uart->overrun_backoff,
11636d7f677aSDarwin Dingel serial_8250_overrun_backoff_work);
11646d7f677aSDarwin Dingel } else {
11656d7f677aSDarwin Dingel uart->overrun_backoff_time_ms = 0;
11666d7f677aSDarwin Dingel }
1167352c4cf4SHe Zhe }
11686d7f677aSDarwin Dingel
11699d86719fSTony Lindgren unlock:
11709196d8acSJiri Slaby mutex_unlock(&serial_mutex);
11719196d8acSJiri Slaby
11729196d8acSJiri Slaby return ret;
1173e0a851feSLukas Wunner
1174e0a851feSLukas Wunner err:
1175e0a851feSLukas Wunner uart->port.dev = NULL;
1176e0a851feSLukas Wunner mutex_unlock(&serial_mutex);
1177e0a851feSLukas Wunner return ret;
11789196d8acSJiri Slaby }
11799196d8acSJiri Slaby EXPORT_SYMBOL(serial8250_register_8250_port);
11809196d8acSJiri Slaby
11819196d8acSJiri Slaby /**
11829196d8acSJiri Slaby * serial8250_unregister_port - remove a 16x50 serial port at runtime
11839196d8acSJiri Slaby * @line: serial line number
11849196d8acSJiri Slaby *
11859196d8acSJiri Slaby * Remove one serial port. This may not be called from interrupt
11869196d8acSJiri Slaby * context. We hand the port back to the our control.
11879196d8acSJiri Slaby */
serial8250_unregister_port(int line)11889196d8acSJiri Slaby void serial8250_unregister_port(int line)
11899196d8acSJiri Slaby {
11909196d8acSJiri Slaby struct uart_8250_port *uart = &serial8250_ports[line];
11919196d8acSJiri Slaby
11929196d8acSJiri Slaby mutex_lock(&serial_mutex);
1193bf2a0be4SMatwey V. Kornilov
1194bf2a0be4SMatwey V. Kornilov if (uart->em485) {
1195bf2a0be4SMatwey V. Kornilov unsigned long flags;
1196bf2a0be4SMatwey V. Kornilov
1197bf2a0be4SMatwey V. Kornilov spin_lock_irqsave(&uart->port.lock, flags);
1198bf2a0be4SMatwey V. Kornilov serial8250_em485_destroy(uart);
1199bf2a0be4SMatwey V. Kornilov spin_unlock_irqrestore(&uart->port.lock, flags);
1200bf2a0be4SMatwey V. Kornilov }
1201bf2a0be4SMatwey V. Kornilov
12029196d8acSJiri Slaby uart_remove_one_port(&serial8250_reg, &uart->port);
12039196d8acSJiri Slaby if (serial8250_isa_devs) {
12049196d8acSJiri Slaby uart->port.flags &= ~UPF_BOOT_AUTOCONF;
12059196d8acSJiri Slaby uart->port.type = PORT_UNKNOWN;
12069196d8acSJiri Slaby uart->port.dev = &serial8250_isa_devs->dev;
1207*bbb4abb1STony Lindgren uart->port.port_id = line;
12085db496b9SPeter Hurley uart->capabilities = 0;
120904e82793STony Lindgren serial8250_init_port(uart);
1210c7ac15ceSAndy Shevchenko serial8250_apply_quirks(uart);
12119196d8acSJiri Slaby uart_add_one_port(&serial8250_reg, &uart->port);
12129196d8acSJiri Slaby } else {
12139196d8acSJiri Slaby uart->port.dev = NULL;
12149196d8acSJiri Slaby }
12159196d8acSJiri Slaby mutex_unlock(&serial_mutex);
12169196d8acSJiri Slaby }
12179196d8acSJiri Slaby EXPORT_SYMBOL(serial8250_unregister_port);
12189196d8acSJiri Slaby
serial8250_init(void)12199196d8acSJiri Slaby static int __init serial8250_init(void)
12209196d8acSJiri Slaby {
12219196d8acSJiri Slaby int ret;
12229196d8acSJiri Slaby
122359cfc45fSJan Kiszka if (nr_uarts == 0)
122459cfc45fSJan Kiszka return -ENODEV;
122559cfc45fSJan Kiszka
12269196d8acSJiri Slaby serial8250_isa_init_ports();
12279196d8acSJiri Slaby
12282cfc64f3SAndy Shevchenko pr_info("Serial: 8250/16550 driver, %d ports, IRQ sharing %s\n",
12292cfc64f3SAndy Shevchenko nr_uarts, str_enabled_disabled(share_irqs));
12309196d8acSJiri Slaby
12319196d8acSJiri Slaby #ifdef CONFIG_SPARC
12329196d8acSJiri Slaby ret = sunserial_register_minors(&serial8250_reg, UART_NR);
12339196d8acSJiri Slaby #else
12349196d8acSJiri Slaby serial8250_reg.nr = UART_NR;
12359196d8acSJiri Slaby ret = uart_register_driver(&serial8250_reg);
12369196d8acSJiri Slaby #endif
12379196d8acSJiri Slaby if (ret)
12389196d8acSJiri Slaby goto out;
12399196d8acSJiri Slaby
12409196d8acSJiri Slaby ret = serial8250_pnp_init();
12419196d8acSJiri Slaby if (ret)
12429196d8acSJiri Slaby goto unreg_uart_drv;
12439196d8acSJiri Slaby
12449196d8acSJiri Slaby serial8250_isa_devs = platform_device_alloc("serial8250",
12459196d8acSJiri Slaby PLAT8250_DEV_LEGACY);
12469196d8acSJiri Slaby if (!serial8250_isa_devs) {
12479196d8acSJiri Slaby ret = -ENOMEM;
12489196d8acSJiri Slaby goto unreg_pnp;
12499196d8acSJiri Slaby }
12509196d8acSJiri Slaby
12519196d8acSJiri Slaby ret = platform_device_add(serial8250_isa_devs);
12529196d8acSJiri Slaby if (ret)
12539196d8acSJiri Slaby goto put_dev;
12549196d8acSJiri Slaby
12559196d8acSJiri Slaby serial8250_register_ports(&serial8250_reg, &serial8250_isa_devs->dev);
12569196d8acSJiri Slaby
12579196d8acSJiri Slaby ret = platform_driver_register(&serial8250_isa_driver);
12589196d8acSJiri Slaby if (ret == 0)
12599196d8acSJiri Slaby goto out;
12609196d8acSJiri Slaby
12619196d8acSJiri Slaby platform_device_del(serial8250_isa_devs);
12629196d8acSJiri Slaby put_dev:
12639196d8acSJiri Slaby platform_device_put(serial8250_isa_devs);
12649196d8acSJiri Slaby unreg_pnp:
12659196d8acSJiri Slaby serial8250_pnp_exit();
12669196d8acSJiri Slaby unreg_uart_drv:
12679196d8acSJiri Slaby #ifdef CONFIG_SPARC
12689196d8acSJiri Slaby sunserial_unregister_minors(&serial8250_reg, UART_NR);
12699196d8acSJiri Slaby #else
12709196d8acSJiri Slaby uart_unregister_driver(&serial8250_reg);
12719196d8acSJiri Slaby #endif
12729196d8acSJiri Slaby out:
12739196d8acSJiri Slaby return ret;
12749196d8acSJiri Slaby }
12759196d8acSJiri Slaby
serial8250_exit(void)12769196d8acSJiri Slaby static void __exit serial8250_exit(void)
12779196d8acSJiri Slaby {
12789196d8acSJiri Slaby struct platform_device *isa_dev = serial8250_isa_devs;
12799196d8acSJiri Slaby
12809196d8acSJiri Slaby /*
12819196d8acSJiri Slaby * This tells serial8250_unregister_port() not to re-register
12829196d8acSJiri Slaby * the ports (thereby making serial8250_isa_driver permanently
12839196d8acSJiri Slaby * in use.)
12849196d8acSJiri Slaby */
12859196d8acSJiri Slaby serial8250_isa_devs = NULL;
12869196d8acSJiri Slaby
12879196d8acSJiri Slaby platform_driver_unregister(&serial8250_isa_driver);
12889196d8acSJiri Slaby platform_device_unregister(isa_dev);
12899196d8acSJiri Slaby
12909196d8acSJiri Slaby serial8250_pnp_exit();
12919196d8acSJiri Slaby
12929196d8acSJiri Slaby #ifdef CONFIG_SPARC
12939196d8acSJiri Slaby sunserial_unregister_minors(&serial8250_reg, UART_NR);
12949196d8acSJiri Slaby #else
12959196d8acSJiri Slaby uart_unregister_driver(&serial8250_reg);
12969196d8acSJiri Slaby #endif
12979196d8acSJiri Slaby }
12989196d8acSJiri Slaby
12999196d8acSJiri Slaby module_init(serial8250_init);
13009196d8acSJiri Slaby module_exit(serial8250_exit);
13019196d8acSJiri Slaby
13029196d8acSJiri Slaby MODULE_LICENSE("GPL");
13039196d8acSJiri Slaby MODULE_DESCRIPTION("Generic 8250/16x50 serial driver");
13049196d8acSJiri Slaby
13053b60daf8SDavid Howells module_param_hw(share_irqs, uint, other, 0644);
130690ad7c44SAnton Wuerfel MODULE_PARM_DESC(share_irqs, "Share IRQs with other non-8250/16x50 devices (unsafe)");
13079196d8acSJiri Slaby
13089196d8acSJiri Slaby module_param(nr_uarts, uint, 0644);
13099196d8acSJiri Slaby MODULE_PARM_DESC(nr_uarts, "Maximum number of UARTs supported. (1-" __MODULE_STRING(CONFIG_SERIAL_8250_NR_UARTS) ")");
13109196d8acSJiri Slaby
13119196d8acSJiri Slaby module_param(skip_txen_test, uint, 0644);
13129196d8acSJiri Slaby MODULE_PARM_DESC(skip_txen_test, "Skip checking for the TXEN bug at init time");
13139196d8acSJiri Slaby
13149196d8acSJiri Slaby #ifdef CONFIG_SERIAL_8250_RSA
13153b60daf8SDavid Howells module_param_hw_array(probe_rsa, ulong, ioport, &probe_rsa_count, 0444);
13169196d8acSJiri Slaby MODULE_PARM_DESC(probe_rsa, "Probe I/O ports for RSA");
13179196d8acSJiri Slaby #endif
13189196d8acSJiri Slaby MODULE_ALIAS_CHARDEV_MAJOR(TTY_MAJOR);
13199196d8acSJiri Slaby
13209326b047SJiri Slaby #ifdef CONFIG_SERIAL_8250_DEPRECATED_OPTIONS
13219196d8acSJiri Slaby #ifndef MODULE
13229196d8acSJiri Slaby /* This module was renamed to 8250_core in 3.7. Keep the old "8250" name
13239196d8acSJiri Slaby * working as well for the module options so we don't break people. We
13249196d8acSJiri Slaby * need to keep the names identical and the convenient macros will happily
13259196d8acSJiri Slaby * refuse to let us do that by failing the build with redefinition errors
13269196d8acSJiri Slaby * of global variables. So we stick them inside a dummy function to avoid
13279196d8acSJiri Slaby * those conflicts. The options still get parsed, and the redefined
13289196d8acSJiri Slaby * MODULE_PARAM_PREFIX lets us keep the "8250." syntax alive.
13299196d8acSJiri Slaby *
13309196d8acSJiri Slaby * This is hacky. I'm sorry.
13319196d8acSJiri Slaby */
s8250_options(void)13329196d8acSJiri Slaby static void __used s8250_options(void)
13339196d8acSJiri Slaby {
13349196d8acSJiri Slaby #undef MODULE_PARAM_PREFIX
13359196d8acSJiri Slaby #define MODULE_PARAM_PREFIX "8250_core."
13369196d8acSJiri Slaby
13379196d8acSJiri Slaby module_param_cb(share_irqs, ¶m_ops_uint, &share_irqs, 0644);
13389196d8acSJiri Slaby module_param_cb(nr_uarts, ¶m_ops_uint, &nr_uarts, 0644);
13399196d8acSJiri Slaby module_param_cb(skip_txen_test, ¶m_ops_uint, &skip_txen_test, 0644);
13409196d8acSJiri Slaby #ifdef CONFIG_SERIAL_8250_RSA
13419196d8acSJiri Slaby __module_param_call(MODULE_PARAM_PREFIX, probe_rsa,
13429196d8acSJiri Slaby ¶m_array_ops, .arr = &__param_arr_probe_rsa,
134391f9d330SJani Nikula 0444, -1, 0);
13449196d8acSJiri Slaby #endif
13459196d8acSJiri Slaby }
13469196d8acSJiri Slaby #else
13479196d8acSJiri Slaby MODULE_ALIAS("8250_core");
13489196d8acSJiri Slaby #endif
13499326b047SJiri Slaby #endif
1350