Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
b6830f6d | 2 | * Universal/legacy driver for 8250/16550-type serial ports |
1da177e4 LT |
3 | * |
4 | * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o. | |
5 | * | |
6 | * Copyright (C) 2001 Russell King. | |
7 | * | |
b6830f6d PH |
8 | * Supports: ISA-compatible 8250/16550 ports |
9 | * PNP 8250/16550 ports | |
10 | * early_serial_setup() ports | |
11 | * userspace-configurable "phantom" ports | |
12 | * "serial8250" platform devices | |
13 | * serial8250_register_8250_port() ports | |
14 | * | |
1da177e4 LT |
15 | * This program is free software; you can redistribute it and/or modify |
16 | * it under the terms of the GNU General Public License as published by | |
17 | * the Free Software Foundation; either version 2 of the License, or | |
18 | * (at your option) any later version. | |
1da177e4 | 19 | */ |
1da177e4 | 20 | |
1da177e4 LT |
21 | #include <linux/module.h> |
22 | #include <linux/moduleparam.h> | |
23 | #include <linux/ioport.h> | |
24 | #include <linux/init.h> | |
25 | #include <linux/console.h> | |
26 | #include <linux/sysrq.h> | |
1da177e4 | 27 | #include <linux/delay.h> |
d052d1be | 28 | #include <linux/platform_device.h> |
1da177e4 | 29 | #include <linux/tty.h> |
cd3ecad1 | 30 | #include <linux/ratelimit.h> |
1da177e4 | 31 | #include <linux/tty_flip.h> |
1da177e4 LT |
32 | #include <linux/serial.h> |
33 | #include <linux/serial_8250.h> | |
78512ece | 34 | #include <linux/nmi.h> |
f392ecfa | 35 | #include <linux/mutex.h> |
5a0e3ad6 | 36 | #include <linux/slab.h> |
0b4af1d9 | 37 | #include <linux/uaccess.h> |
d74d5d1b | 38 | #include <linux/pm_runtime.h> |
2584cf83 | 39 | #include <linux/io.h> |
6816383a PG |
40 | #ifdef CONFIG_SPARC |
41 | #include <linux/sunserialcore.h> | |
42 | #endif | |
1da177e4 | 43 | |
1da177e4 LT |
44 | #include <asm/irq.h> |
45 | ||
46 | #include "8250.h" | |
47 | ||
48 | /* | |
49 | * Configuration: | |
40663cc7 | 50 | * share_irqs - whether we pass IRQF_SHARED to request_irq(). This option |
1da177e4 LT |
51 | * is unsafe when used on edge-triggered interrupts. |
52 | */ | |
408b664a | 53 | static unsigned int share_irqs = SERIAL8250_SHARE_IRQS; |
1da177e4 | 54 | |
a61c2d78 DJ |
55 | static unsigned int nr_uarts = CONFIG_SERIAL_8250_RUNTIME_UARTS; |
56 | ||
8440838b DM |
57 | static struct uart_driver serial8250_reg; |
58 | ||
d41a4b51 CE |
59 | static unsigned int skip_txen_test; /* force skip of txen test at init time */ |
60 | ||
e7328ae1 | 61 | #define PASS_LIMIT 512 |
1da177e4 | 62 | |
a4ed1e41 | 63 | #include <asm/serial.h> |
1da177e4 LT |
64 | /* |
65 | * SERIAL_PORT_DFNS tells us about built-in ports that have no | |
66 | * standard enumeration mechanism. Platforms that can find all | |
67 | * serial ports via mechanisms like ACPI or PCI need not supply it. | |
68 | */ | |
69 | #ifndef SERIAL_PORT_DFNS | |
70 | #define SERIAL_PORT_DFNS | |
71 | #endif | |
72 | ||
cb3592be | 73 | static const struct old_serial_port old_serial_port[] = { |
1da177e4 LT |
74 | SERIAL_PORT_DFNS /* defined in asm/serial.h */ |
75 | }; | |
76 | ||
026d02a2 | 77 | #define UART_NR CONFIG_SERIAL_8250_NR_UARTS |
1da177e4 LT |
78 | |
79 | #ifdef CONFIG_SERIAL_8250_RSA | |
80 | ||
81 | #define PORT_RSA_MAX 4 | |
82 | static unsigned long probe_rsa[PORT_RSA_MAX]; | |
83 | static unsigned int probe_rsa_count; | |
84 | #endif /* CONFIG_SERIAL_8250_RSA */ | |
85 | ||
1da177e4 | 86 | struct irq_info { |
25db8ad5 AC |
87 | struct hlist_node node; |
88 | int irq; | |
89 | spinlock_t lock; /* Protects list not the hash */ | |
1da177e4 LT |
90 | struct list_head *head; |
91 | }; | |
92 | ||
25db8ad5 AC |
93 | #define NR_IRQ_HASH 32 /* Can be adjusted later */ |
94 | static struct hlist_head irq_lists[NR_IRQ_HASH]; | |
95 | static DEFINE_MUTEX(hash_mutex); /* Used to walk the hash */ | |
1da177e4 LT |
96 | |
97 | /* | |
b6830f6d PH |
98 | * This is the serial driver's interrupt routine. |
99 | * | |
100 | * Arjan thinks the old way was overly complex, so it got simplified. | |
101 | * Alan disagrees, saying that need the complexity to handle the weird | |
102 | * nature of ISA shared interrupts. (This is a special exception.) | |
103 | * | |
104 | * In order to handle ISA shared interrupts properly, we need to check | |
105 | * that all ports have been serviced, and therefore the ISA interrupt | |
106 | * line has been de-asserted. | |
107 | * | |
108 | * This means we need to loop through all ports. checking that they | |
109 | * don't have an interrupt pending. | |
1da177e4 | 110 | */ |
b6830f6d | 111 | static irqreturn_t serial8250_interrupt(int irq, void *dev_id) |
7d6a07d1 | 112 | { |
b6830f6d PH |
113 | struct irq_info *i = dev_id; |
114 | struct list_head *l, *end = NULL; | |
115 | int pass_counter = 0, handled = 0; | |
7d6a07d1 | 116 | |
934014d5 | 117 | pr_debug("%s(%d): start\n", __func__, irq); |
583d28e9 | 118 | |
b6830f6d | 119 | spin_lock(&i->lock); |
cc419fa0 | 120 | |
b6830f6d PH |
121 | l = i->head; |
122 | do { | |
123 | struct uart_8250_port *up; | |
124 | struct uart_port *port; | |
cc419fa0 | 125 | |
b6830f6d PH |
126 | up = list_entry(l, struct uart_8250_port, list); |
127 | port = &up->port; | |
1da177e4 | 128 | |
b6830f6d PH |
129 | if (port->handle_irq(port)) { |
130 | handled = 1; | |
131 | end = NULL; | |
132 | } else if (end == NULL) | |
133 | end = l; | |
1da177e4 | 134 | |
b6830f6d | 135 | l = l->next; |
1da177e4 | 136 | |
b6830f6d PH |
137 | if (l == i->head && pass_counter++ > PASS_LIMIT) { |
138 | /* If we hit this, we're dead. */ | |
139 | printk_ratelimited(KERN_ERR | |
140 | "serial8250: too much work for irq%d\n", irq); | |
141 | break; | |
142 | } | |
143 | } while (l != end); | |
c627f2ce | 144 | |
b6830f6d | 145 | spin_unlock(&i->lock); |
12bf3f24 | 146 | |
934014d5 | 147 | pr_debug("%s(%d): end\n", __func__, irq); |
1da177e4 | 148 | |
b6830f6d | 149 | return IRQ_RETVAL(handled); |
40b36daa AW |
150 | } |
151 | ||
1da177e4 | 152 | /* |
b6830f6d PH |
153 | * To support ISA shared interrupts, we need to have one interrupt |
154 | * handler that ensures that the IRQ line has been deasserted | |
155 | * before returning. Failing to do this will result in the IRQ | |
156 | * line being stuck active, and, since ISA irqs are edge triggered, | |
157 | * no more IRQs will be seen. | |
1da177e4 | 158 | */ |
b6830f6d | 159 | static void serial_do_unlink(struct irq_info *i, struct uart_8250_port *up) |
1da177e4 | 160 | { |
b6830f6d | 161 | spin_lock_irq(&i->lock); |
1da177e4 | 162 | |
b6830f6d PH |
163 | if (!list_empty(i->head)) { |
164 | if (i->head == &up->list) | |
165 | i->head = i->head->next; | |
166 | list_del(&up->list); | |
167 | } else { | |
168 | BUG_ON(i->head != &up->list); | |
169 | i->head = NULL; | |
170 | } | |
171 | spin_unlock_irq(&i->lock); | |
172 | /* List empty so throw away the hash node */ | |
173 | if (i->head == NULL) { | |
174 | hlist_del(&i->node); | |
175 | kfree(i); | |
1da177e4 LT |
176 | } |
177 | } | |
178 | ||
b6830f6d | 179 | static int serial_link_irq_chain(struct uart_8250_port *up) |
0ad372b9 | 180 | { |
b6830f6d PH |
181 | struct hlist_head *h; |
182 | struct hlist_node *n; | |
183 | struct irq_info *i; | |
184 | int ret, irq_flags = up->port.flags & UPF_SHARE_IRQ ? IRQF_SHARED : 0; | |
0ad372b9 | 185 | |
b6830f6d | 186 | mutex_lock(&hash_mutex); |
d74d5d1b | 187 | |
b6830f6d | 188 | h = &irq_lists[up->port.irq % NR_IRQ_HASH]; |
d74d5d1b | 189 | |
b6830f6d PH |
190 | hlist_for_each(n, h) { |
191 | i = hlist_entry(n, struct irq_info, node); | |
192 | if (i->irq == up->port.irq) | |
193 | break; | |
194 | } | |
d74d5d1b | 195 | |
b6830f6d PH |
196 | if (n == NULL) { |
197 | i = kzalloc(sizeof(struct irq_info), GFP_KERNEL); | |
198 | if (i == NULL) { | |
199 | mutex_unlock(&hash_mutex); | |
200 | return -ENOMEM; | |
201 | } | |
202 | spin_lock_init(&i->lock); | |
203 | i->irq = up->port.irq; | |
204 | hlist_add_head(&i->node, h); | |
205 | } | |
206 | mutex_unlock(&hash_mutex); | |
d74d5d1b | 207 | |
b6830f6d | 208 | spin_lock_irq(&i->lock); |
d74d5d1b | 209 | |
b6830f6d PH |
210 | if (i->head) { |
211 | list_add(&up->list, i->head); | |
212 | spin_unlock_irq(&i->lock); | |
d74d5d1b | 213 | |
b6830f6d PH |
214 | ret = 0; |
215 | } else { | |
216 | INIT_LIST_HEAD(&up->list); | |
217 | i->head = &up->list; | |
218 | spin_unlock_irq(&i->lock); | |
219 | irq_flags |= up->port.irqflags; | |
220 | ret = request_irq(up->port.irq, serial8250_interrupt, | |
b2c663d1 | 221 | irq_flags, up->port.name, i); |
b6830f6d PH |
222 | if (ret < 0) |
223 | serial_do_unlink(i, up); | |
224 | } | |
d74d5d1b | 225 | |
b6830f6d | 226 | return ret; |
d74d5d1b SAS |
227 | } |
228 | ||
b6830f6d | 229 | static void serial_unlink_irq_chain(struct uart_8250_port *up) |
1da177e4 | 230 | { |
dc96efb7 | 231 | /* |
b6830f6d PH |
232 | * yes, some broken gcc emit "warning: 'i' may be used uninitialized" |
233 | * but no, we are not going to take a patch that assigns NULL below. | |
dc96efb7 | 234 | */ |
b6830f6d PH |
235 | struct irq_info *i; |
236 | struct hlist_node *n; | |
237 | struct hlist_head *h; | |
1da177e4 | 238 | |
b6830f6d | 239 | mutex_lock(&hash_mutex); |
1da177e4 | 240 | |
b6830f6d | 241 | h = &irq_lists[up->port.irq % NR_IRQ_HASH]; |
1da177e4 | 242 | |
b6830f6d PH |
243 | hlist_for_each(n, h) { |
244 | i = hlist_entry(n, struct irq_info, node); | |
245 | if (i->irq == up->port.irq) | |
246 | break; | |
1da177e4 LT |
247 | } |
248 | ||
b6830f6d PH |
249 | BUG_ON(n == NULL); |
250 | BUG_ON(i->head == NULL); | |
1da177e4 | 251 | |
b6830f6d PH |
252 | if (list_empty(i->head)) |
253 | free_irq(up->port.irq, i); | |
1da177e4 | 254 | |
b6830f6d PH |
255 | serial_do_unlink(i, up); |
256 | mutex_unlock(&hash_mutex); | |
1da177e4 LT |
257 | } |
258 | ||
259 | /* | |
b6830f6d PH |
260 | * This function is used to handle ports that do not have an |
261 | * interrupt. This doesn't work very well for 16450's, but gives | |
262 | * barely passable results for a 16550A. (Although at the expense | |
263 | * of much CPU overhead). | |
1da177e4 | 264 | */ |
7c335645 | 265 | static void serial8250_timeout(struct timer_list *t) |
1da177e4 | 266 | { |
7c335645 | 267 | struct uart_8250_port *up = from_timer(up, t, timer); |
1da177e4 | 268 | |
b6830f6d PH |
269 | up->port.handle_irq(&up->port); |
270 | mod_timer(&up->timer, jiffies + uart_poll_timeout(&up->port)); | |
271 | } | |
1da177e4 | 272 | |
7c335645 | 273 | static void serial8250_backup_timeout(struct timer_list *t) |
0ec3f585 | 274 | { |
7c335645 | 275 | struct uart_8250_port *up = from_timer(up, t, timer); |
b6830f6d | 276 | unsigned int iir, ier = 0, lsr; |
0ec3f585 | 277 | unsigned long flags; |
1da177e4 | 278 | |
b6830f6d | 279 | spin_lock_irqsave(&up->port.lock, flags); |
45a7bd63 | 280 | |
1da177e4 | 281 | /* |
b6830f6d PH |
282 | * Must disable interrupts or else we risk racing with the interrupt |
283 | * based handler. | |
1da177e4 | 284 | */ |
b6830f6d PH |
285 | if (up->port.irq) { |
286 | ier = serial_in(up, UART_IER); | |
287 | serial_out(up, UART_IER, 0); | |
1da177e4 | 288 | } |
235dae5d | 289 | |
b6830f6d | 290 | iir = serial_in(up, UART_IIR); |
1da177e4 | 291 | |
b6830f6d PH |
292 | /* |
293 | * This should be a safe test for anyone who doesn't trust the | |
294 | * IIR bits on their UART, but it's specifically designed for | |
295 | * the "Diva" UART used on the management processor on many HP | |
296 | * ia64 and parisc boxes. | |
297 | */ | |
298 | lsr = serial_in(up, UART_LSR); | |
299 | up->lsr_saved_flags |= lsr & LSR_SAVE_FLAGS; | |
300 | if ((iir & UART_IIR_NO_INT) && (up->ier & UART_IER_THRI) && | |
301 | (!uart_circ_empty(&up->port.state->xmit) || up->port.x_char) && | |
302 | (lsr & UART_LSR_THRE)) { | |
303 | iir &= ~(UART_IIR_ID | UART_IIR_NO_INT); | |
304 | iir |= UART_IIR_THRI; | |
cab68f89 | 305 | } |
c161afe9 | 306 | |
b6830f6d PH |
307 | if (!(iir & UART_IIR_NO_INT)) |
308 | serial8250_tx_chars(up); | |
1da177e4 | 309 | |
b6830f6d PH |
310 | if (up->port.irq) |
311 | serial_out(up, UART_IER, ier); | |
1da177e4 | 312 | |
b6830f6d | 313 | spin_unlock_irqrestore(&up->port.lock, flags); |
54ec52b6 | 314 | |
b6830f6d PH |
315 | /* Standard timer interval plus 0.2s to keep the port running */ |
316 | mod_timer(&up->timer, | |
317 | jiffies + uart_poll_timeout(&up->port) + HZ / 5); | |
f2eda27d RK |
318 | } |
319 | ||
b6830f6d | 320 | static int univ8250_setup_irq(struct uart_8250_port *up) |
1da177e4 | 321 | { |
dfe42443 | 322 | struct uart_port *port = &up->port; |
b6830f6d | 323 | int retval = 0; |
1da177e4 | 324 | |
b6830f6d PH |
325 | /* |
326 | * The above check will only give an accurate result the first time | |
327 | * the port is opened so this value needs to be preserved. | |
328 | */ | |
329 | if (up->bugs & UART_BUG_THRE) { | |
330 | pr_debug("ttyS%d - using backup timer\n", serial_index(port)); | |
1da177e4 | 331 | |
7c335645 | 332 | up->timer.function = (TIMER_FUNC_TYPE)serial8250_backup_timeout; |
b6830f6d PH |
333 | mod_timer(&up->timer, jiffies + |
334 | uart_poll_timeout(port) + HZ / 5); | |
335 | } | |
1da177e4 | 336 | |
b6830f6d PH |
337 | /* |
338 | * If the "interrupt" for this port doesn't correspond with any | |
339 | * hardware interrupt, we use a timer-based system. The original | |
340 | * driver used to do this with IRQ0. | |
341 | */ | |
342 | if (!port->irq) { | |
b6830f6d PH |
343 | mod_timer(&up->timer, jiffies + uart_poll_timeout(port)); |
344 | } else | |
345 | retval = serial_link_irq_chain(up); | |
1da177e4 | 346 | |
b6830f6d | 347 | return retval; |
1da177e4 LT |
348 | } |
349 | ||
b6830f6d | 350 | static void univ8250_release_irq(struct uart_8250_port *up) |
1da177e4 | 351 | { |
dfe42443 | 352 | struct uart_port *port = &up->port; |
1da177e4 | 353 | |
b6830f6d | 354 | del_timer_sync(&up->timer); |
7c335645 | 355 | up->timer.function = (TIMER_FUNC_TYPE)serial8250_timeout; |
b6830f6d PH |
356 | if (port->irq) |
357 | serial_unlink_irq_chain(up); | |
1da177e4 LT |
358 | } |
359 | ||
cd52b759 | 360 | #ifdef CONFIG_SERIAL_8250_RSA |
1da177e4 LT |
361 | static int serial8250_request_rsa_resource(struct uart_8250_port *up) |
362 | { | |
363 | unsigned long start = UART_RSA_BASE << up->port.regshift; | |
364 | unsigned int size = 8 << up->port.regshift; | |
dfe42443 | 365 | struct uart_port *port = &up->port; |
0b30d668 | 366 | int ret = -EINVAL; |
1da177e4 | 367 | |
dfe42443 | 368 | switch (port->iotype) { |
1da177e4 LT |
369 | case UPIO_HUB6: |
370 | case UPIO_PORT: | |
dfe42443 | 371 | start += port->iobase; |
0b30d668 SS |
372 | if (request_region(start, size, "serial-rsa")) |
373 | ret = 0; | |
374 | else | |
1da177e4 LT |
375 | ret = -EBUSY; |
376 | break; | |
377 | } | |
378 | ||
379 | return ret; | |
380 | } | |
381 | ||
382 | static void serial8250_release_rsa_resource(struct uart_8250_port *up) | |
383 | { | |
384 | unsigned long offset = UART_RSA_BASE << up->port.regshift; | |
385 | unsigned int size = 8 << up->port.regshift; | |
dfe42443 | 386 | struct uart_port *port = &up->port; |
1da177e4 | 387 | |
dfe42443 | 388 | switch (port->iotype) { |
1da177e4 LT |
389 | case UPIO_HUB6: |
390 | case UPIO_PORT: | |
dfe42443 | 391 | release_region(port->iobase + offset, size); |
1da177e4 LT |
392 | break; |
393 | } | |
394 | } | |
cd52b759 | 395 | #endif |
1da177e4 | 396 | |
40375393 PH |
397 | static const struct uart_ops *base_ops; |
398 | static struct uart_ops univ8250_port_ops; | |
399 | ||
a4416cd1 PH |
400 | static const struct uart_8250_ops univ8250_driver_ops = { |
401 | .setup_irq = univ8250_setup_irq, | |
402 | .release_irq = univ8250_release_irq, | |
403 | }; | |
404 | ||
1da177e4 LT |
405 | static struct uart_8250_port serial8250_ports[UART_NR]; |
406 | ||
ae14a795 SAS |
407 | /** |
408 | * serial8250_get_port - retrieve struct uart_8250_port | |
409 | * @line: serial line number | |
410 | * | |
411 | * This function retrieves struct uart_8250_port for the specific line. | |
412 | * This struct *must* *not* be used to perform a 8250 or serial core operation | |
413 | * which is not accessible otherwise. Its only purpose is to make the struct | |
414 | * accessible to the runtime-pm callbacks for context suspend/restore. | |
415 | * The lock assumption made here is none because runtime-pm suspend/resume | |
416 | * callbacks should not be invoked if there is any operation performed on the | |
417 | * port. | |
418 | */ | |
419 | struct uart_8250_port *serial8250_get_port(int line) | |
420 | { | |
421 | return &serial8250_ports[line]; | |
422 | } | |
423 | EXPORT_SYMBOL_GPL(serial8250_get_port); | |
424 | ||
af7f3743 | 425 | static void (*serial8250_isa_config)(int port, struct uart_port *up, |
98838d95 | 426 | u32 *capabilities); |
af7f3743 AC |
427 | |
428 | void serial8250_set_isa_configurator( | |
98838d95 | 429 | void (*v)(int port, struct uart_port *up, u32 *capabilities)) |
af7f3743 AC |
430 | { |
431 | serial8250_isa_config = v; | |
432 | } | |
433 | EXPORT_SYMBOL(serial8250_set_isa_configurator); | |
434 | ||
40375393 PH |
435 | #ifdef CONFIG_SERIAL_8250_RSA |
436 | ||
437 | static void univ8250_config_port(struct uart_port *port, int flags) | |
438 | { | |
439 | struct uart_8250_port *up = up_to_u8250p(port); | |
440 | ||
441 | up->probe &= ~UART_PROBE_RSA; | |
442 | if (port->type == PORT_RSA) { | |
443 | if (serial8250_request_rsa_resource(up) == 0) | |
444 | up->probe |= UART_PROBE_RSA; | |
445 | } else if (flags & UART_CONFIG_TYPE) { | |
446 | int i; | |
447 | ||
448 | for (i = 0; i < probe_rsa_count; i++) { | |
449 | if (probe_rsa[i] == up->port.iobase) { | |
450 | if (serial8250_request_rsa_resource(up) == 0) | |
451 | up->probe |= UART_PROBE_RSA; | |
452 | break; | |
453 | } | |
454 | } | |
455 | } | |
456 | ||
457 | base_ops->config_port(port, flags); | |
458 | ||
459 | if (port->type != PORT_RSA && up->probe & UART_PROBE_RSA) | |
460 | serial8250_release_rsa_resource(up); | |
461 | } | |
462 | ||
463 | static int univ8250_request_port(struct uart_port *port) | |
464 | { | |
465 | struct uart_8250_port *up = up_to_u8250p(port); | |
466 | int ret; | |
467 | ||
468 | ret = base_ops->request_port(port); | |
469 | if (ret == 0 && port->type == PORT_RSA) { | |
470 | ret = serial8250_request_rsa_resource(up); | |
471 | if (ret < 0) | |
472 | base_ops->release_port(port); | |
473 | } | |
474 | ||
475 | return ret; | |
476 | } | |
477 | ||
478 | static void univ8250_release_port(struct uart_port *port) | |
479 | { | |
480 | struct uart_8250_port *up = up_to_u8250p(port); | |
481 | ||
482 | if (port->type == PORT_RSA) | |
483 | serial8250_release_rsa_resource(up); | |
484 | base_ops->release_port(port); | |
485 | } | |
486 | ||
487 | static void univ8250_rsa_support(struct uart_ops *ops) | |
488 | { | |
489 | ops->config_port = univ8250_config_port; | |
490 | ops->request_port = univ8250_request_port; | |
491 | ops->release_port = univ8250_release_port; | |
492 | } | |
493 | ||
494 | #else | |
495 | #define univ8250_rsa_support(x) do { } while (0) | |
496 | #endif /* CONFIG_SERIAL_8250_RSA */ | |
497 | ||
c7ac15ce AS |
498 | static inline void serial8250_apply_quirks(struct uart_8250_port *up) |
499 | { | |
500 | up->port.quirks |= skip_txen_test ? UPQ_NO_TXEN_TEST : 0; | |
501 | } | |
502 | ||
1da177e4 LT |
503 | static void __init serial8250_isa_init_ports(void) |
504 | { | |
505 | struct uart_8250_port *up; | |
506 | static int first = 1; | |
4c0ebb80 | 507 | int i, irqflag = 0; |
1da177e4 LT |
508 | |
509 | if (!first) | |
510 | return; | |
511 | first = 0; | |
512 | ||
835d844d SY |
513 | if (nr_uarts > UART_NR) |
514 | nr_uarts = UART_NR; | |
515 | ||
317a6842 | 516 | for (i = 0; i < nr_uarts; i++) { |
1da177e4 | 517 | struct uart_8250_port *up = &serial8250_ports[i]; |
dfe42443 | 518 | struct uart_port *port = &up->port; |
1da177e4 | 519 | |
dfe42443 | 520 | port->line = i; |
0a16e2c1 | 521 | serial8250_init_port(up); |
40375393 PH |
522 | if (!base_ops) |
523 | base_ops = port->ops; | |
524 | port->ops = &univ8250_port_ops; | |
1da177e4 | 525 | |
7c335645 | 526 | timer_setup(&up->timer, serial8250_timeout, 0); |
1da177e4 | 527 | |
a4416cd1 PH |
528 | up->ops = &univ8250_driver_ops; |
529 | ||
1da177e4 LT |
530 | /* |
531 | * ALPHA_KLUDGE_MCR needs to be killed. | |
532 | */ | |
533 | up->mcr_mask = ~ALPHA_KLUDGE_MCR; | |
534 | up->mcr_force = ALPHA_KLUDGE_MCR; | |
1da177e4 LT |
535 | } |
536 | ||
40375393 PH |
537 | /* chain base port ops to support Remote Supervisor Adapter */ |
538 | univ8250_port_ops = *base_ops; | |
539 | univ8250_rsa_support(&univ8250_port_ops); | |
540 | ||
4c0ebb80 AGR |
541 | if (share_irqs) |
542 | irqflag = IRQF_SHARED; | |
543 | ||
44454bcd | 544 | for (i = 0, up = serial8250_ports; |
a61c2d78 | 545 | i < ARRAY_SIZE(old_serial_port) && i < nr_uarts; |
1da177e4 | 546 | i++, up++) { |
dfe42443 PG |
547 | struct uart_port *port = &up->port; |
548 | ||
549 | port->iobase = old_serial_port[i].port; | |
550 | port->irq = irq_canonicalize(old_serial_port[i].irq); | |
b0f8aed2 | 551 | port->irqflags = 0; |
dfe42443 PG |
552 | port->uartclk = old_serial_port[i].baud_base * 16; |
553 | port->flags = old_serial_port[i].flags; | |
b0f8aed2 | 554 | port->hub6 = 0; |
dfe42443 PG |
555 | port->membase = old_serial_port[i].iomem_base; |
556 | port->iotype = old_serial_port[i].io_type; | |
557 | port->regshift = old_serial_port[i].iomem_reg_shift; | |
1a53e079 PH |
558 | serial8250_set_defaults(up); |
559 | ||
dfe42443 | 560 | port->irqflags |= irqflag; |
af7f3743 AC |
561 | if (serial8250_isa_config != NULL) |
562 | serial8250_isa_config(i, &up->port, &up->capabilities); | |
1da177e4 LT |
563 | } |
564 | } | |
565 | ||
566 | static void __init | |
567 | serial8250_register_ports(struct uart_driver *drv, struct device *dev) | |
568 | { | |
569 | int i; | |
570 | ||
b8e7e40a AC |
571 | for (i = 0; i < nr_uarts; i++) { |
572 | struct uart_8250_port *up = &serial8250_ports[i]; | |
b8e7e40a | 573 | |
e4fda3a0 MS |
574 | if (up->port.type == PORT_8250_CIR) |
575 | continue; | |
576 | ||
835d844d SY |
577 | if (up->port.dev) |
578 | continue; | |
1da177e4 LT |
579 | |
580 | up->port.dev = dev; | |
b5d228cc | 581 | |
c7ac15ce | 582 | serial8250_apply_quirks(up); |
1da177e4 LT |
583 | uart_add_one_port(drv, &up->port); |
584 | } | |
585 | } | |
586 | ||
587 | #ifdef CONFIG_SERIAL_8250_CONSOLE | |
588 | ||
6e281571 PH |
589 | static void univ8250_console_write(struct console *co, const char *s, |
590 | unsigned int count) | |
591 | { | |
592 | struct uart_8250_port *up = &serial8250_ports[co->index]; | |
593 | ||
594 | serial8250_console_write(up, s, count); | |
595 | } | |
596 | ||
6e281571 PH |
597 | static int univ8250_console_setup(struct console *co, char *options) |
598 | { | |
87515772 | 599 | struct uart_port *port; |
d70a7b16 | 600 | int retval; |
6e281571 | 601 | |
1da177e4 LT |
602 | /* |
603 | * Check whether an invalid uart number has been specified, and | |
604 | * if so, search for the first available port that does have | |
605 | * console support. | |
606 | */ | |
317a6842 | 607 | if (co->index >= nr_uarts) |
1da177e4 | 608 | co->index = 0; |
87515772 | 609 | port = &serial8250_ports[co->index].port; |
6e281571 | 610 | /* link port to console */ |
87515772 | 611 | port->cons = co; |
1da177e4 | 612 | |
d70a7b16 PH |
613 | retval = serial8250_console_setup(port, options, false); |
614 | if (retval != 0) | |
615 | port->cons = NULL; | |
616 | return retval; | |
1da177e4 LT |
617 | } |
618 | ||
c7cef0a8 | 619 | /** |
6e281571 | 620 | * univ8250_console_match - non-standard console matching |
c7cef0a8 PH |
621 | * @co: registering console |
622 | * @name: name from console command line | |
623 | * @idx: index from console command line | |
624 | * @options: ptr to option string from console command line | |
625 | * | |
626 | * Only attempts to match console command lines of the form: | |
bd94c407 | 627 | * console=uart[8250],io|mmio|mmio16|mmio32,<addr>[,<options>] |
ca782f16 | 628 | * console=uart[8250],0x<addr>[,<options>] |
c7cef0a8 PH |
629 | * This form is used to register an initial earlycon boot console and |
630 | * replace it with the serial8250_console at 8250 driver init. | |
631 | * | |
632 | * Performs console setup for a match (as required by interface) | |
ca782f16 | 633 | * If no <options> are specified, then assume the h/w is already setup. |
c7cef0a8 PH |
634 | * |
635 | * Returns 0 if console matches; otherwise non-zero to use default matching | |
636 | */ | |
6e281571 PH |
637 | static int univ8250_console_match(struct console *co, char *name, int idx, |
638 | char *options) | |
18a8bd94 | 639 | { |
c7cef0a8 PH |
640 | char match[] = "uart"; /* 8250-specific earlycon name */ |
641 | unsigned char iotype; | |
46e36683 | 642 | resource_size_t addr; |
c7cef0a8 PH |
643 | int i; |
644 | ||
645 | if (strncmp(name, match, 4) != 0) | |
646 | return -ENODEV; | |
647 | ||
648 | if (uart_parse_earlycon(options, &iotype, &addr, &options)) | |
649 | return -ENODEV; | |
650 | ||
651 | /* try to match the port specified on the command line */ | |
652 | for (i = 0; i < nr_uarts; i++) { | |
653 | struct uart_port *port = &serial8250_ports[i].port; | |
654 | ||
655 | if (port->iotype != iotype) | |
656 | continue; | |
bd94c407 MY |
657 | if ((iotype == UPIO_MEM || iotype == UPIO_MEM16 || |
658 | iotype == UPIO_MEM32 || iotype == UPIO_MEM32BE) | |
659 | && (port->mapbase != addr)) | |
c7cef0a8 PH |
660 | continue; |
661 | if (iotype == UPIO_PORT && port->iobase != addr) | |
662 | continue; | |
663 | ||
664 | co->index = i; | |
87515772 PH |
665 | port->cons = co; |
666 | return serial8250_console_setup(port, options, true); | |
c7cef0a8 PH |
667 | } |
668 | ||
669 | return -ENODEV; | |
18a8bd94 YL |
670 | } |
671 | ||
6e281571 | 672 | static struct console univ8250_console = { |
1da177e4 | 673 | .name = "ttyS", |
6e281571 | 674 | .write = univ8250_console_write, |
1da177e4 | 675 | .device = uart_console_device, |
6e281571 PH |
676 | .setup = univ8250_console_setup, |
677 | .match = univ8250_console_match, | |
6741f551 | 678 | .flags = CON_PRINTBUFFER | CON_ANYTIME, |
1da177e4 LT |
679 | .index = -1, |
680 | .data = &serial8250_reg, | |
681 | }; | |
682 | ||
6e281571 | 683 | static int __init univ8250_console_init(void) |
1da177e4 | 684 | { |
59cfc45f JK |
685 | if (nr_uarts == 0) |
686 | return -ENODEV; | |
687 | ||
1da177e4 | 688 | serial8250_isa_init_ports(); |
6e281571 | 689 | register_console(&univ8250_console); |
1da177e4 LT |
690 | return 0; |
691 | } | |
6e281571 | 692 | console_initcall(univ8250_console_init); |
1da177e4 | 693 | |
149a44cc | 694 | #define SERIAL8250_CONSOLE (&univ8250_console) |
1da177e4 LT |
695 | #else |
696 | #define SERIAL8250_CONSOLE NULL | |
697 | #endif | |
698 | ||
699 | static struct uart_driver serial8250_reg = { | |
700 | .owner = THIS_MODULE, | |
701 | .driver_name = "serial", | |
1da177e4 LT |
702 | .dev_name = "ttyS", |
703 | .major = TTY_MAJOR, | |
704 | .minor = 64, | |
1da177e4 LT |
705 | .cons = SERIAL8250_CONSOLE, |
706 | }; | |
707 | ||
d856c666 RK |
708 | /* |
709 | * early_serial_setup - early registration for 8250 ports | |
710 | * | |
711 | * Setup an 8250 port structure prior to console initialisation. Use | |
712 | * after console initialisation will cause undefined behaviour. | |
713 | */ | |
1da177e4 LT |
714 | int __init early_serial_setup(struct uart_port *port) |
715 | { | |
b430428a DD |
716 | struct uart_port *p; |
717 | ||
59cfc45f | 718 | if (port->line >= ARRAY_SIZE(serial8250_ports) || nr_uarts == 0) |
1da177e4 LT |
719 | return -ENODEV; |
720 | ||
721 | serial8250_isa_init_ports(); | |
b430428a DD |
722 | p = &serial8250_ports[port->line].port; |
723 | p->iobase = port->iobase; | |
724 | p->membase = port->membase; | |
725 | p->irq = port->irq; | |
1c2f0493 | 726 | p->irqflags = port->irqflags; |
b430428a DD |
727 | p->uartclk = port->uartclk; |
728 | p->fifosize = port->fifosize; | |
729 | p->regshift = port->regshift; | |
730 | p->iotype = port->iotype; | |
731 | p->flags = port->flags; | |
732 | p->mapbase = port->mapbase; | |
ee97d0e3 | 733 | p->mapsize = port->mapsize; |
b430428a | 734 | p->private_data = port->private_data; |
125c97d8 HD |
735 | p->type = port->type; |
736 | p->line = port->line; | |
7d6a07d1 | 737 | |
1a53e079 PH |
738 | serial8250_set_defaults(up_to_u8250p(p)); |
739 | ||
7d6a07d1 DD |
740 | if (port->serial_in) |
741 | p->serial_in = port->serial_in; | |
742 | if (port->serial_out) | |
743 | p->serial_out = port->serial_out; | |
583d28e9 JI |
744 | if (port->handle_irq) |
745 | p->handle_irq = port->handle_irq; | |
7d6a07d1 | 746 | |
1da177e4 LT |
747 | return 0; |
748 | } | |
749 | ||
750 | /** | |
751 | * serial8250_suspend_port - suspend one serial port | |
752 | * @line: serial line number | |
1da177e4 LT |
753 | * |
754 | * Suspend one serial port. | |
755 | */ | |
756 | void serial8250_suspend_port(int line) | |
757 | { | |
4516d50a PH |
758 | struct uart_8250_port *up = &serial8250_ports[line]; |
759 | struct uart_port *port = &up->port; | |
760 | ||
761 | if (!console_suspend_enabled && uart_console(port) && | |
762 | port->type != PORT_8250) { | |
763 | unsigned char canary = 0xa5; | |
764 | serial_out(up, UART_SCR, canary); | |
f01a0bd8 PH |
765 | if (serial_in(up, UART_SCR) == canary) |
766 | up->canary = canary; | |
4516d50a PH |
767 | } |
768 | ||
769 | uart_suspend_port(&serial8250_reg, port); | |
1da177e4 | 770 | } |
b34f9faf | 771 | EXPORT_SYMBOL(serial8250_suspend_port); |
1da177e4 LT |
772 | |
773 | /** | |
774 | * serial8250_resume_port - resume one serial port | |
775 | * @line: serial line number | |
1da177e4 LT |
776 | * |
777 | * Resume one serial port. | |
778 | */ | |
779 | void serial8250_resume_port(int line) | |
780 | { | |
b5b82df6 | 781 | struct uart_8250_port *up = &serial8250_ports[line]; |
dfe42443 | 782 | struct uart_port *port = &up->port; |
b5b82df6 | 783 | |
4516d50a PH |
784 | up->canary = 0; |
785 | ||
b5b82df6 | 786 | if (up->capabilities & UART_NATSEMI) { |
b5b82df6 | 787 | /* Ensure it's still in high speed mode */ |
4fd996a1 | 788 | serial_port_out(port, UART_LCR, 0xE0); |
b5b82df6 | 789 | |
0d0389e5 | 790 | ns16550a_goto_highspeed(up); |
b5b82df6 | 791 | |
4fd996a1 | 792 | serial_port_out(port, UART_LCR, 0); |
dfe42443 | 793 | port->uartclk = 921600*16; |
b5b82df6 | 794 | } |
dfe42443 | 795 | uart_resume_port(&serial8250_reg, port); |
1da177e4 | 796 | } |
b34f9faf | 797 | EXPORT_SYMBOL(serial8250_resume_port); |
1da177e4 LT |
798 | |
799 | /* | |
800 | * Register a set of serial devices attached to a platform device. The | |
801 | * list is terminated with a zero flags entry, which means we expect | |
802 | * all entries to have at least UPF_BOOT_AUTOCONF set. | |
803 | */ | |
9671f099 | 804 | static int serial8250_probe(struct platform_device *dev) |
1da177e4 | 805 | { |
574de559 | 806 | struct plat_serial8250_port *p = dev_get_platdata(&dev->dev); |
2655a2c7 | 807 | struct uart_8250_port uart; |
4c0ebb80 | 808 | int ret, i, irqflag = 0; |
1da177e4 | 809 | |
2655a2c7 | 810 | memset(&uart, 0, sizeof(uart)); |
1da177e4 | 811 | |
4c0ebb80 AGR |
812 | if (share_irqs) |
813 | irqflag = IRQF_SHARED; | |
814 | ||
ec9f47cd | 815 | for (i = 0; p && p->flags != 0; p++, i++) { |
2655a2c7 AC |
816 | uart.port.iobase = p->iobase; |
817 | uart.port.membase = p->membase; | |
818 | uart.port.irq = p->irq; | |
819 | uart.port.irqflags = p->irqflags; | |
820 | uart.port.uartclk = p->uartclk; | |
821 | uart.port.regshift = p->regshift; | |
822 | uart.port.iotype = p->iotype; | |
823 | uart.port.flags = p->flags; | |
824 | uart.port.mapbase = p->mapbase; | |
825 | uart.port.hub6 = p->hub6; | |
826 | uart.port.private_data = p->private_data; | |
827 | uart.port.type = p->type; | |
828 | uart.port.serial_in = p->serial_in; | |
829 | uart.port.serial_out = p->serial_out; | |
830 | uart.port.handle_irq = p->handle_irq; | |
831 | uart.port.handle_break = p->handle_break; | |
832 | uart.port.set_termios = p->set_termios; | |
db405a8f | 833 | uart.port.set_ldisc = p->set_ldisc; |
144ef5c2 | 834 | uart.port.get_mctrl = p->get_mctrl; |
2655a2c7 AC |
835 | uart.port.pm = p->pm; |
836 | uart.port.dev = &dev->dev; | |
837 | uart.port.irqflags |= irqflag; | |
838 | ret = serial8250_register_8250_port(&uart); | |
ec9f47cd | 839 | if (ret < 0) { |
3ae5eaec | 840 | dev_err(&dev->dev, "unable to register port at index %d " |
4f640efb JB |
841 | "(IO%lx MEM%llx IRQ%d): %d\n", i, |
842 | p->iobase, (unsigned long long)p->mapbase, | |
843 | p->irq, ret); | |
ec9f47cd | 844 | } |
1da177e4 LT |
845 | } |
846 | return 0; | |
847 | } | |
848 | ||
849 | /* | |
850 | * Remove serial ports registered against a platform device. | |
851 | */ | |
ae8d8a14 | 852 | static int serial8250_remove(struct platform_device *dev) |
1da177e4 LT |
853 | { |
854 | int i; | |
855 | ||
317a6842 | 856 | for (i = 0; i < nr_uarts; i++) { |
1da177e4 LT |
857 | struct uart_8250_port *up = &serial8250_ports[i]; |
858 | ||
3ae5eaec | 859 | if (up->port.dev == &dev->dev) |
1da177e4 LT |
860 | serial8250_unregister_port(i); |
861 | } | |
862 | return 0; | |
863 | } | |
864 | ||
3ae5eaec | 865 | static int serial8250_suspend(struct platform_device *dev, pm_message_t state) |
1da177e4 LT |
866 | { |
867 | int i; | |
868 | ||
1da177e4 LT |
869 | for (i = 0; i < UART_NR; i++) { |
870 | struct uart_8250_port *up = &serial8250_ports[i]; | |
871 | ||
3ae5eaec | 872 | if (up->port.type != PORT_UNKNOWN && up->port.dev == &dev->dev) |
1da177e4 LT |
873 | uart_suspend_port(&serial8250_reg, &up->port); |
874 | } | |
875 | ||
876 | return 0; | |
877 | } | |
878 | ||
3ae5eaec | 879 | static int serial8250_resume(struct platform_device *dev) |
1da177e4 LT |
880 | { |
881 | int i; | |
882 | ||
1da177e4 LT |
883 | for (i = 0; i < UART_NR; i++) { |
884 | struct uart_8250_port *up = &serial8250_ports[i]; | |
885 | ||
3ae5eaec | 886 | if (up->port.type != PORT_UNKNOWN && up->port.dev == &dev->dev) |
b5b82df6 | 887 | serial8250_resume_port(i); |
1da177e4 LT |
888 | } |
889 | ||
890 | return 0; | |
891 | } | |
892 | ||
3ae5eaec | 893 | static struct platform_driver serial8250_isa_driver = { |
1da177e4 | 894 | .probe = serial8250_probe, |
2d47b716 | 895 | .remove = serial8250_remove, |
1da177e4 LT |
896 | .suspend = serial8250_suspend, |
897 | .resume = serial8250_resume, | |
3ae5eaec RK |
898 | .driver = { |
899 | .name = "serial8250", | |
900 | }, | |
1da177e4 LT |
901 | }; |
902 | ||
903 | /* | |
904 | * This "device" covers _all_ ISA 8250-compatible serial devices listed | |
905 | * in the table in include/asm/serial.h | |
906 | */ | |
907 | static struct platform_device *serial8250_isa_devs; | |
908 | ||
909 | /* | |
2655a2c7 | 910 | * serial8250_register_8250_port and serial8250_unregister_port allows for |
1da177e4 LT |
911 | * 16x50 serial ports to be configured at run-time, to support PCMCIA |
912 | * modems and PCI multiport cards. | |
913 | */ | |
f392ecfa | 914 | static DEFINE_MUTEX(serial_mutex); |
1da177e4 LT |
915 | |
916 | static struct uart_8250_port *serial8250_find_match_or_unused(struct uart_port *port) | |
917 | { | |
918 | int i; | |
919 | ||
920 | /* | |
921 | * First, find a port entry which matches. | |
922 | */ | |
317a6842 | 923 | for (i = 0; i < nr_uarts; i++) |
1da177e4 LT |
924 | if (uart_match_port(&serial8250_ports[i].port, port)) |
925 | return &serial8250_ports[i]; | |
926 | ||
59b3e898 SAS |
927 | /* try line number first if still available */ |
928 | i = port->line; | |
929 | if (i < nr_uarts && serial8250_ports[i].port.type == PORT_UNKNOWN && | |
930 | serial8250_ports[i].port.iobase == 0) | |
931 | return &serial8250_ports[i]; | |
1da177e4 LT |
932 | /* |
933 | * We didn't find a matching entry, so look for the first | |
934 | * free entry. We look for one which hasn't been previously | |
935 | * used (indicated by zero iobase). | |
936 | */ | |
317a6842 | 937 | for (i = 0; i < nr_uarts; i++) |
1da177e4 LT |
938 | if (serial8250_ports[i].port.type == PORT_UNKNOWN && |
939 | serial8250_ports[i].port.iobase == 0) | |
940 | return &serial8250_ports[i]; | |
941 | ||
942 | /* | |
943 | * That also failed. Last resort is to find any entry which | |
944 | * doesn't have a real port associated with it. | |
945 | */ | |
317a6842 | 946 | for (i = 0; i < nr_uarts; i++) |
1da177e4 LT |
947 | if (serial8250_ports[i].port.type == PORT_UNKNOWN) |
948 | return &serial8250_ports[i]; | |
949 | ||
950 | return NULL; | |
951 | } | |
952 | ||
953 | /** | |
f73fa05b | 954 | * serial8250_register_8250_port - register a serial port |
58bcd332 | 955 | * @up: serial port template |
1da177e4 LT |
956 | * |
957 | * Configure the serial port specified by the request. If the | |
958 | * port exists and is in use, it is hung up and unregistered | |
959 | * first. | |
960 | * | |
961 | * The port is then probed and if necessary the IRQ is autodetected | |
962 | * If this fails an error is returned. | |
963 | * | |
964 | * On success the port is ready to use and the line number is returned. | |
965 | */ | |
f73fa05b | 966 | int serial8250_register_8250_port(struct uart_8250_port *up) |
1da177e4 LT |
967 | { |
968 | struct uart_8250_port *uart; | |
969 | int ret = -ENOSPC; | |
970 | ||
f73fa05b | 971 | if (up->port.uartclk == 0) |
1da177e4 LT |
972 | return -EINVAL; |
973 | ||
f392ecfa | 974 | mutex_lock(&serial_mutex); |
1da177e4 | 975 | |
f73fa05b | 976 | uart = serial8250_find_match_or_unused(&up->port); |
65ecc9c0 | 977 | if (uart && uart->port.type != PORT_8250_CIR) { |
835d844d SY |
978 | if (uart->port.dev) |
979 | uart_remove_one_port(&serial8250_reg, &uart->port); | |
1da177e4 | 980 | |
f73fa05b MD |
981 | uart->port.iobase = up->port.iobase; |
982 | uart->port.membase = up->port.membase; | |
983 | uart->port.irq = up->port.irq; | |
984 | uart->port.irqflags = up->port.irqflags; | |
985 | uart->port.uartclk = up->port.uartclk; | |
986 | uart->port.fifosize = up->port.fifosize; | |
987 | uart->port.regshift = up->port.regshift; | |
988 | uart->port.iotype = up->port.iotype; | |
989 | uart->port.flags = up->port.flags | UPF_BOOT_AUTOCONF; | |
a2d33d87 | 990 | uart->bugs = up->bugs; |
f73fa05b | 991 | uart->port.mapbase = up->port.mapbase; |
ee97d0e3 | 992 | uart->port.mapsize = up->port.mapsize; |
f73fa05b | 993 | uart->port.private_data = up->port.private_data; |
9660497c HK |
994 | uart->tx_loadsz = up->tx_loadsz; |
995 | uart->capabilities = up->capabilities; | |
234abab1 SAS |
996 | uart->port.throttle = up->port.throttle; |
997 | uart->port.unthrottle = up->port.unthrottle; | |
46c55b4b RRD |
998 | uart->port.rs485_config = up->port.rs485_config; |
999 | uart->port.rs485 = up->port.rs485; | |
d53e1428 | 1000 | uart->dma = up->dma; |
9660497c | 1001 | |
6a3f45dc HK |
1002 | /* Take tx_loadsz from fifosize if it wasn't set separately */ |
1003 | if (uart->port.fifosize && !uart->tx_loadsz) | |
1004 | uart->tx_loadsz = uart->port.fifosize; | |
1005 | ||
f73fa05b MD |
1006 | if (up->port.dev) |
1007 | uart->port.dev = up->port.dev; | |
1008 | ||
1009 | if (up->port.flags & UPF_FIXED_TYPE) | |
afd483bd | 1010 | uart->port.type = up->port.type; |
8e23fcc8 | 1011 | |
1a53e079 PH |
1012 | serial8250_set_defaults(uart); |
1013 | ||
7d6a07d1 | 1014 | /* Possibly override default I/O functions. */ |
f73fa05b MD |
1015 | if (up->port.serial_in) |
1016 | uart->port.serial_in = up->port.serial_in; | |
1017 | if (up->port.serial_out) | |
1018 | uart->port.serial_out = up->port.serial_out; | |
1019 | if (up->port.handle_irq) | |
1020 | uart->port.handle_irq = up->port.handle_irq; | |
235dae5d | 1021 | /* Possibly override set_termios call */ |
f73fa05b MD |
1022 | if (up->port.set_termios) |
1023 | uart->port.set_termios = up->port.set_termios; | |
db405a8f EB |
1024 | if (up->port.set_ldisc) |
1025 | uart->port.set_ldisc = up->port.set_ldisc; | |
144ef5c2 WAZ |
1026 | if (up->port.get_mctrl) |
1027 | uart->port.get_mctrl = up->port.get_mctrl; | |
4bf4ea9d PH |
1028 | if (up->port.set_mctrl) |
1029 | uart->port.set_mctrl = up->port.set_mctrl; | |
b99b121b SAS |
1030 | if (up->port.startup) |
1031 | uart->port.startup = up->port.startup; | |
1032 | if (up->port.shutdown) | |
1033 | uart->port.shutdown = up->port.shutdown; | |
f73fa05b MD |
1034 | if (up->port.pm) |
1035 | uart->port.pm = up->port.pm; | |
1036 | if (up->port.handle_break) | |
1037 | uart->port.handle_break = up->port.handle_break; | |
1038 | if (up->dl_read) | |
1039 | uart->dl_read = up->dl_read; | |
1040 | if (up->dl_write) | |
1041 | uart->dl_write = up->dl_write; | |
1da177e4 | 1042 | |
9527b82a SY |
1043 | if (uart->port.type != PORT_8250_CIR) { |
1044 | if (serial8250_isa_config != NULL) | |
1045 | serial8250_isa_config(0, &uart->port, | |
1046 | &uart->capabilities); | |
1047 | ||
cf0a1579 | 1048 | serial8250_apply_quirks(uart); |
9527b82a SY |
1049 | ret = uart_add_one_port(&serial8250_reg, |
1050 | &uart->port); | |
1051 | if (ret == 0) | |
1052 | ret = uart->port.line; | |
1053 | } else { | |
1054 | dev_info(uart->port.dev, | |
1055 | "skipping CIR port at 0x%lx / 0x%llx, IRQ %d\n", | |
1056 | uart->port.iobase, | |
1057 | (unsigned long long)uart->port.mapbase, | |
1058 | uart->port.irq); | |
af7f3743 | 1059 | |
9527b82a SY |
1060 | ret = 0; |
1061 | } | |
1da177e4 | 1062 | } |
f392ecfa | 1063 | mutex_unlock(&serial_mutex); |
1da177e4 LT |
1064 | |
1065 | return ret; | |
1066 | } | |
f73fa05b MD |
1067 | EXPORT_SYMBOL(serial8250_register_8250_port); |
1068 | ||
1da177e4 LT |
1069 | /** |
1070 | * serial8250_unregister_port - remove a 16x50 serial port at runtime | |
1071 | * @line: serial line number | |
1072 | * | |
1073 | * Remove one serial port. This may not be called from interrupt | |
1074 | * context. We hand the port back to the our control. | |
1075 | */ | |
1076 | void serial8250_unregister_port(int line) | |
1077 | { | |
1078 | struct uart_8250_port *uart = &serial8250_ports[line]; | |
1079 | ||
f392ecfa | 1080 | mutex_lock(&serial_mutex); |
bf2a0be4 MK |
1081 | |
1082 | if (uart->em485) { | |
1083 | unsigned long flags; | |
1084 | ||
1085 | spin_lock_irqsave(&uart->port.lock, flags); | |
1086 | serial8250_em485_destroy(uart); | |
1087 | spin_unlock_irqrestore(&uart->port.lock, flags); | |
1088 | } | |
1089 | ||
1da177e4 LT |
1090 | uart_remove_one_port(&serial8250_reg, &uart->port); |
1091 | if (serial8250_isa_devs) { | |
1092 | uart->port.flags &= ~UPF_BOOT_AUTOCONF; | |
1093 | uart->port.type = PORT_UNKNOWN; | |
1094 | uart->port.dev = &serial8250_isa_devs->dev; | |
5db496b9 | 1095 | uart->capabilities = 0; |
c7ac15ce | 1096 | serial8250_apply_quirks(uart); |
1da177e4 LT |
1097 | uart_add_one_port(&serial8250_reg, &uart->port); |
1098 | } else { | |
1099 | uart->port.dev = NULL; | |
1100 | } | |
f392ecfa | 1101 | mutex_unlock(&serial_mutex); |
1da177e4 LT |
1102 | } |
1103 | EXPORT_SYMBOL(serial8250_unregister_port); | |
1104 | ||
1105 | static int __init serial8250_init(void) | |
1106 | { | |
25db8ad5 | 1107 | int ret; |
1da177e4 | 1108 | |
59cfc45f JK |
1109 | if (nr_uarts == 0) |
1110 | return -ENODEV; | |
1111 | ||
835d844d | 1112 | serial8250_isa_init_ports(); |
a61c2d78 | 1113 | |
9f59fbf0 PR |
1114 | pr_info("Serial: 8250/16550 driver, %d ports, IRQ sharing %sabled\n", |
1115 | nr_uarts, share_irqs ? "en" : "dis"); | |
1da177e4 | 1116 | |
b70ac771 DM |
1117 | #ifdef CONFIG_SPARC |
1118 | ret = sunserial_register_minors(&serial8250_reg, UART_NR); | |
1119 | #else | |
1120 | serial8250_reg.nr = UART_NR; | |
1da177e4 | 1121 | ret = uart_register_driver(&serial8250_reg); |
b70ac771 | 1122 | #endif |
1da177e4 LT |
1123 | if (ret) |
1124 | goto out; | |
1125 | ||
835d844d SY |
1126 | ret = serial8250_pnp_init(); |
1127 | if (ret) | |
1128 | goto unreg_uart_drv; | |
1129 | ||
7493a314 DT |
1130 | serial8250_isa_devs = platform_device_alloc("serial8250", |
1131 | PLAT8250_DEV_LEGACY); | |
1132 | if (!serial8250_isa_devs) { | |
1133 | ret = -ENOMEM; | |
835d844d | 1134 | goto unreg_pnp; |
1da177e4 LT |
1135 | } |
1136 | ||
7493a314 DT |
1137 | ret = platform_device_add(serial8250_isa_devs); |
1138 | if (ret) | |
1139 | goto put_dev; | |
1140 | ||
1da177e4 LT |
1141 | serial8250_register_ports(&serial8250_reg, &serial8250_isa_devs->dev); |
1142 | ||
bc965a7f RK |
1143 | ret = platform_driver_register(&serial8250_isa_driver); |
1144 | if (ret == 0) | |
1145 | goto out; | |
1da177e4 | 1146 | |
bc965a7f | 1147 | platform_device_del(serial8250_isa_devs); |
25db8ad5 | 1148 | put_dev: |
7493a314 | 1149 | platform_device_put(serial8250_isa_devs); |
835d844d SY |
1150 | unreg_pnp: |
1151 | serial8250_pnp_exit(); | |
25db8ad5 | 1152 | unreg_uart_drv: |
b70ac771 DM |
1153 | #ifdef CONFIG_SPARC |
1154 | sunserial_unregister_minors(&serial8250_reg, UART_NR); | |
1155 | #else | |
1da177e4 | 1156 | uart_unregister_driver(&serial8250_reg); |
b70ac771 | 1157 | #endif |
25db8ad5 | 1158 | out: |
1da177e4 LT |
1159 | return ret; |
1160 | } | |
1161 | ||
1162 | static void __exit serial8250_exit(void) | |
1163 | { | |
1164 | struct platform_device *isa_dev = serial8250_isa_devs; | |
1165 | ||
1166 | /* | |
1167 | * This tells serial8250_unregister_port() not to re-register | |
1168 | * the ports (thereby making serial8250_isa_driver permanently | |
1169 | * in use.) | |
1170 | */ | |
1171 | serial8250_isa_devs = NULL; | |
1172 | ||
3ae5eaec | 1173 | platform_driver_unregister(&serial8250_isa_driver); |
1da177e4 LT |
1174 | platform_device_unregister(isa_dev); |
1175 | ||
835d844d SY |
1176 | serial8250_pnp_exit(); |
1177 | ||
b70ac771 DM |
1178 | #ifdef CONFIG_SPARC |
1179 | sunserial_unregister_minors(&serial8250_reg, UART_NR); | |
1180 | #else | |
1da177e4 | 1181 | uart_unregister_driver(&serial8250_reg); |
b70ac771 | 1182 | #endif |
1da177e4 LT |
1183 | } |
1184 | ||
1185 | module_init(serial8250_init); | |
1186 | module_exit(serial8250_exit); | |
1187 | ||
1da177e4 | 1188 | MODULE_LICENSE("GPL"); |
d87a6d95 | 1189 | MODULE_DESCRIPTION("Generic 8250/16x50 serial driver"); |
1da177e4 | 1190 | |
3b60daf8 | 1191 | module_param_hw(share_irqs, uint, other, 0644); |
90ad7c44 | 1192 | MODULE_PARM_DESC(share_irqs, "Share IRQs with other non-8250/16x50 devices (unsafe)"); |
1da177e4 | 1193 | |
a61c2d78 DJ |
1194 | module_param(nr_uarts, uint, 0644); |
1195 | MODULE_PARM_DESC(nr_uarts, "Maximum number of UARTs supported. (1-" __MODULE_STRING(CONFIG_SERIAL_8250_NR_UARTS) ")"); | |
1196 | ||
d41a4b51 CE |
1197 | module_param(skip_txen_test, uint, 0644); |
1198 | MODULE_PARM_DESC(skip_txen_test, "Skip checking for the TXEN bug at init time"); | |
1199 | ||
1da177e4 | 1200 | #ifdef CONFIG_SERIAL_8250_RSA |
3b60daf8 | 1201 | module_param_hw_array(probe_rsa, ulong, ioport, &probe_rsa_count, 0444); |
1da177e4 LT |
1202 | MODULE_PARM_DESC(probe_rsa, "Probe I/O ports for RSA"); |
1203 | #endif | |
1204 | MODULE_ALIAS_CHARDEV_MAJOR(TTY_MAJOR); | |
f2b8dfd9 | 1205 | |
9326b047 | 1206 | #ifdef CONFIG_SERIAL_8250_DEPRECATED_OPTIONS |
f2b8dfd9 JB |
1207 | #ifndef MODULE |
1208 | /* This module was renamed to 8250_core in 3.7. Keep the old "8250" name | |
1209 | * working as well for the module options so we don't break people. We | |
1210 | * need to keep the names identical and the convenient macros will happily | |
1211 | * refuse to let us do that by failing the build with redefinition errors | |
1212 | * of global variables. So we stick them inside a dummy function to avoid | |
1213 | * those conflicts. The options still get parsed, and the redefined | |
1214 | * MODULE_PARAM_PREFIX lets us keep the "8250." syntax alive. | |
1215 | * | |
1216 | * This is hacky. I'm sorry. | |
1217 | */ | |
1218 | static void __used s8250_options(void) | |
1219 | { | |
1220 | #undef MODULE_PARAM_PREFIX | |
9196d8ac | 1221 | #define MODULE_PARAM_PREFIX "8250_core." |
f2b8dfd9 JB |
1222 | |
1223 | module_param_cb(share_irqs, ¶m_ops_uint, &share_irqs, 0644); | |
1224 | module_param_cb(nr_uarts, ¶m_ops_uint, &nr_uarts, 0644); | |
1225 | module_param_cb(skip_txen_test, ¶m_ops_uint, &skip_txen_test, 0644); | |
1226 | #ifdef CONFIG_SERIAL_8250_RSA | |
1227 | __module_param_call(MODULE_PARAM_PREFIX, probe_rsa, | |
1228 | ¶m_array_ops, .arr = &__param_arr_probe_rsa, | |
91f9d330 | 1229 | 0444, -1, 0); |
f2b8dfd9 JB |
1230 | #endif |
1231 | } | |
1232 | #else | |
9196d8ac | 1233 | MODULE_ALIAS("8250_core"); |
f2b8dfd9 | 1234 | #endif |
f2b8dfd9 | 1235 | #endif |