Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
1da177e4 LT |
2 | * Driver for 8250/16550-type serial ports |
3 | * | |
4 | * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o. | |
5 | * | |
6 | * Copyright (C) 2001 Russell King. | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
1da177e4 LT |
13 | * A note about mapbase / membase |
14 | * | |
15 | * mapbase is the physical address of the IO port. | |
16 | * membase is an 'ioremapped' cookie. | |
17 | */ | |
1da177e4 LT |
18 | |
19 | #if defined(CONFIG_SERIAL_8250_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) | |
20 | #define SUPPORT_SYSRQ | |
21 | #endif | |
22 | ||
23 | #include <linux/module.h> | |
24 | #include <linux/moduleparam.h> | |
25 | #include <linux/ioport.h> | |
26 | #include <linux/init.h> | |
27 | #include <linux/console.h> | |
28 | #include <linux/sysrq.h> | |
1da177e4 | 29 | #include <linux/delay.h> |
d052d1be | 30 | #include <linux/platform_device.h> |
1da177e4 | 31 | #include <linux/tty.h> |
cd3ecad1 | 32 | #include <linux/ratelimit.h> |
1da177e4 LT |
33 | #include <linux/tty_flip.h> |
34 | #include <linux/serial_reg.h> | |
35 | #include <linux/serial_core.h> | |
36 | #include <linux/serial.h> | |
37 | #include <linux/serial_8250.h> | |
78512ece | 38 | #include <linux/nmi.h> |
f392ecfa | 39 | #include <linux/mutex.h> |
5a0e3ad6 | 40 | #include <linux/slab.h> |
6816383a PG |
41 | #ifdef CONFIG_SPARC |
42 | #include <linux/sunserialcore.h> | |
43 | #endif | |
1da177e4 LT |
44 | |
45 | #include <asm/io.h> | |
46 | #include <asm/irq.h> | |
47 | ||
48 | #include "8250.h" | |
49 | ||
50 | /* | |
51 | * Configuration: | |
40663cc7 | 52 | * share_irqs - whether we pass IRQF_SHARED to request_irq(). This option |
1da177e4 LT |
53 | * is unsafe when used on edge-triggered interrupts. |
54 | */ | |
408b664a | 55 | static unsigned int share_irqs = SERIAL8250_SHARE_IRQS; |
1da177e4 | 56 | |
a61c2d78 DJ |
57 | static unsigned int nr_uarts = CONFIG_SERIAL_8250_RUNTIME_UARTS; |
58 | ||
8440838b DM |
59 | static struct uart_driver serial8250_reg; |
60 | ||
61 | static int serial_index(struct uart_port *port) | |
62 | { | |
63 | return (serial8250_reg.minor - 64) + port->line; | |
64 | } | |
65 | ||
d41a4b51 CE |
66 | static unsigned int skip_txen_test; /* force skip of txen test at init time */ |
67 | ||
1da177e4 LT |
68 | /* |
69 | * Debugging. | |
70 | */ | |
71 | #if 0 | |
72 | #define DEBUG_AUTOCONF(fmt...) printk(fmt) | |
73 | #else | |
74 | #define DEBUG_AUTOCONF(fmt...) do { } while (0) | |
75 | #endif | |
76 | ||
77 | #if 0 | |
78 | #define DEBUG_INTR(fmt...) printk(fmt) | |
79 | #else | |
80 | #define DEBUG_INTR(fmt...) do { } while (0) | |
81 | #endif | |
82 | ||
e7328ae1 | 83 | #define PASS_LIMIT 512 |
1da177e4 | 84 | |
bca47613 DH |
85 | #define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE) |
86 | ||
87 | ||
1da177e4 LT |
88 | #ifdef CONFIG_SERIAL_8250_DETECT_IRQ |
89 | #define CONFIG_SERIAL_DETECT_IRQ 1 | |
90 | #endif | |
1da177e4 LT |
91 | #ifdef CONFIG_SERIAL_8250_MANY_PORTS |
92 | #define CONFIG_SERIAL_MANY_PORTS 1 | |
93 | #endif | |
94 | ||
95 | /* | |
96 | * HUB6 is always on. This will be removed once the header | |
97 | * files have been cleaned. | |
98 | */ | |
99 | #define CONFIG_HUB6 1 | |
100 | ||
a4ed1e41 | 101 | #include <asm/serial.h> |
1da177e4 LT |
102 | /* |
103 | * SERIAL_PORT_DFNS tells us about built-in ports that have no | |
104 | * standard enumeration mechanism. Platforms that can find all | |
105 | * serial ports via mechanisms like ACPI or PCI need not supply it. | |
106 | */ | |
107 | #ifndef SERIAL_PORT_DFNS | |
108 | #define SERIAL_PORT_DFNS | |
109 | #endif | |
110 | ||
cb3592be | 111 | static const struct old_serial_port old_serial_port[] = { |
1da177e4 LT |
112 | SERIAL_PORT_DFNS /* defined in asm/serial.h */ |
113 | }; | |
114 | ||
026d02a2 | 115 | #define UART_NR CONFIG_SERIAL_8250_NR_UARTS |
1da177e4 LT |
116 | |
117 | #ifdef CONFIG_SERIAL_8250_RSA | |
118 | ||
119 | #define PORT_RSA_MAX 4 | |
120 | static unsigned long probe_rsa[PORT_RSA_MAX]; | |
121 | static unsigned int probe_rsa_count; | |
122 | #endif /* CONFIG_SERIAL_8250_RSA */ | |
123 | ||
1da177e4 | 124 | struct irq_info { |
25db8ad5 AC |
125 | struct hlist_node node; |
126 | int irq; | |
127 | spinlock_t lock; /* Protects list not the hash */ | |
1da177e4 LT |
128 | struct list_head *head; |
129 | }; | |
130 | ||
25db8ad5 AC |
131 | #define NR_IRQ_HASH 32 /* Can be adjusted later */ |
132 | static struct hlist_head irq_lists[NR_IRQ_HASH]; | |
133 | static DEFINE_MUTEX(hash_mutex); /* Used to walk the hash */ | |
1da177e4 LT |
134 | |
135 | /* | |
136 | * Here we define the default xmit fifo size used for each type of UART. | |
137 | */ | |
138 | static const struct serial8250_config uart_config[] = { | |
139 | [PORT_UNKNOWN] = { | |
140 | .name = "unknown", | |
141 | .fifo_size = 1, | |
142 | .tx_loadsz = 1, | |
143 | }, | |
144 | [PORT_8250] = { | |
145 | .name = "8250", | |
146 | .fifo_size = 1, | |
147 | .tx_loadsz = 1, | |
148 | }, | |
149 | [PORT_16450] = { | |
150 | .name = "16450", | |
151 | .fifo_size = 1, | |
152 | .tx_loadsz = 1, | |
153 | }, | |
154 | [PORT_16550] = { | |
155 | .name = "16550", | |
156 | .fifo_size = 1, | |
157 | .tx_loadsz = 1, | |
158 | }, | |
159 | [PORT_16550A] = { | |
160 | .name = "16550A", | |
161 | .fifo_size = 16, | |
162 | .tx_loadsz = 16, | |
163 | .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10, | |
164 | .flags = UART_CAP_FIFO, | |
165 | }, | |
166 | [PORT_CIRRUS] = { | |
167 | .name = "Cirrus", | |
168 | .fifo_size = 1, | |
169 | .tx_loadsz = 1, | |
170 | }, | |
171 | [PORT_16650] = { | |
172 | .name = "ST16650", | |
173 | .fifo_size = 1, | |
174 | .tx_loadsz = 1, | |
175 | .flags = UART_CAP_FIFO | UART_CAP_EFR | UART_CAP_SLEEP, | |
176 | }, | |
177 | [PORT_16650V2] = { | |
178 | .name = "ST16650V2", | |
179 | .fifo_size = 32, | |
180 | .tx_loadsz = 16, | |
181 | .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_01 | | |
182 | UART_FCR_T_TRIG_00, | |
183 | .flags = UART_CAP_FIFO | UART_CAP_EFR | UART_CAP_SLEEP, | |
184 | }, | |
185 | [PORT_16750] = { | |
186 | .name = "TI16750", | |
187 | .fifo_size = 64, | |
188 | .tx_loadsz = 64, | |
189 | .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10 | | |
190 | UART_FCR7_64BYTE, | |
191 | .flags = UART_CAP_FIFO | UART_CAP_SLEEP | UART_CAP_AFE, | |
192 | }, | |
193 | [PORT_STARTECH] = { | |
194 | .name = "Startech", | |
195 | .fifo_size = 1, | |
196 | .tx_loadsz = 1, | |
197 | }, | |
198 | [PORT_16C950] = { | |
199 | .name = "16C950/954", | |
200 | .fifo_size = 128, | |
201 | .tx_loadsz = 128, | |
202 | .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10, | |
d0694e2a PM |
203 | /* UART_CAP_EFR breaks billionon CF bluetooth card. */ |
204 | .flags = UART_CAP_FIFO | UART_CAP_SLEEP, | |
1da177e4 LT |
205 | }, |
206 | [PORT_16654] = { | |
207 | .name = "ST16654", | |
208 | .fifo_size = 64, | |
209 | .tx_loadsz = 32, | |
210 | .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_01 | | |
211 | UART_FCR_T_TRIG_10, | |
212 | .flags = UART_CAP_FIFO | UART_CAP_EFR | UART_CAP_SLEEP, | |
213 | }, | |
214 | [PORT_16850] = { | |
215 | .name = "XR16850", | |
216 | .fifo_size = 128, | |
217 | .tx_loadsz = 128, | |
218 | .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10, | |
219 | .flags = UART_CAP_FIFO | UART_CAP_EFR | UART_CAP_SLEEP, | |
220 | }, | |
221 | [PORT_RSA] = { | |
222 | .name = "RSA", | |
223 | .fifo_size = 2048, | |
224 | .tx_loadsz = 2048, | |
225 | .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_11, | |
226 | .flags = UART_CAP_FIFO, | |
227 | }, | |
228 | [PORT_NS16550A] = { | |
229 | .name = "NS16550A", | |
230 | .fifo_size = 16, | |
231 | .tx_loadsz = 16, | |
232 | .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10, | |
233 | .flags = UART_CAP_FIFO | UART_NATSEMI, | |
234 | }, | |
235 | [PORT_XSCALE] = { | |
236 | .name = "XScale", | |
237 | .fifo_size = 32, | |
238 | .tx_loadsz = 32, | |
239 | .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10, | |
4539c24f | 240 | .flags = UART_CAP_FIFO | UART_CAP_UUE | UART_CAP_RTOIE, |
1da177e4 | 241 | }, |
bd71c182 TK |
242 | [PORT_RM9000] = { |
243 | .name = "RM9000", | |
244 | .fifo_size = 16, | |
245 | .tx_loadsz = 16, | |
246 | .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10, | |
6b06f191 DD |
247 | .flags = UART_CAP_FIFO, |
248 | }, | |
249 | [PORT_OCTEON] = { | |
250 | .name = "OCTEON", | |
251 | .fifo_size = 64, | |
252 | .tx_loadsz = 64, | |
253 | .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10, | |
bd71c182 TK |
254 | .flags = UART_CAP_FIFO, |
255 | }, | |
08e0992f FF |
256 | [PORT_AR7] = { |
257 | .name = "AR7", | |
258 | .fifo_size = 16, | |
259 | .tx_loadsz = 16, | |
260 | .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_00, | |
261 | .flags = UART_CAP_FIFO | UART_CAP_AFE, | |
262 | }, | |
235dae5d PL |
263 | [PORT_U6_16550A] = { |
264 | .name = "U6_16550A", | |
265 | .fifo_size = 64, | |
266 | .tx_loadsz = 64, | |
267 | .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10, | |
268 | .flags = UART_CAP_FIFO | UART_CAP_AFE, | |
269 | }, | |
4539c24f SW |
270 | [PORT_TEGRA] = { |
271 | .name = "Tegra", | |
272 | .fifo_size = 32, | |
273 | .tx_loadsz = 8, | |
274 | .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_01 | | |
275 | UART_FCR_T_TRIG_01, | |
276 | .flags = UART_CAP_FIFO | UART_CAP_RTOIE, | |
277 | }, | |
06315348 SH |
278 | [PORT_XR17D15X] = { |
279 | .name = "XR17D15X", | |
280 | .fifo_size = 64, | |
281 | .tx_loadsz = 64, | |
282 | .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10, | |
283 | .flags = UART_CAP_FIFO | UART_CAP_AFE | UART_CAP_EFR, | |
284 | }, | |
1da177e4 LT |
285 | }; |
286 | ||
cc419fa0 | 287 | /* Uart divisor latch read */ |
e8155629 | 288 | static int default_serial_dl_read(struct uart_8250_port *up) |
cc419fa0 MD |
289 | { |
290 | return serial_in(up, UART_DLL) | serial_in(up, UART_DLM) << 8; | |
291 | } | |
292 | ||
293 | /* Uart divisor latch write */ | |
e8155629 | 294 | static void default_serial_dl_write(struct uart_8250_port *up, int value) |
cc419fa0 MD |
295 | { |
296 | serial_out(up, UART_DLL, value & 0xff); | |
297 | serial_out(up, UART_DLM, value >> 8 & 0xff); | |
298 | } | |
299 | ||
6b416031 | 300 | #ifdef CONFIG_MIPS_ALCHEMY |
21c614a7 PA |
301 | |
302 | /* Au1x00 UART hardware has a weird register layout */ | |
303 | static const u8 au_io_in_map[] = { | |
304 | [UART_RX] = 0, | |
305 | [UART_IER] = 2, | |
306 | [UART_IIR] = 3, | |
307 | [UART_LCR] = 5, | |
308 | [UART_MCR] = 6, | |
309 | [UART_LSR] = 7, | |
310 | [UART_MSR] = 8, | |
311 | }; | |
312 | ||
313 | static const u8 au_io_out_map[] = { | |
314 | [UART_TX] = 1, | |
315 | [UART_IER] = 2, | |
316 | [UART_FCR] = 4, | |
317 | [UART_LCR] = 5, | |
318 | [UART_MCR] = 6, | |
319 | }; | |
320 | ||
6b416031 | 321 | static unsigned int au_serial_in(struct uart_port *p, int offset) |
21c614a7 | 322 | { |
6b416031 MD |
323 | offset = au_io_in_map[offset] << p->regshift; |
324 | return __raw_readl(p->membase + offset); | |
21c614a7 PA |
325 | } |
326 | ||
6b416031 | 327 | static void au_serial_out(struct uart_port *p, int offset, int value) |
21c614a7 | 328 | { |
6b416031 MD |
329 | offset = au_io_out_map[offset] << p->regshift; |
330 | __raw_writel(value, p->membase + offset); | |
331 | } | |
332 | ||
333 | /* Au1x00 haven't got a standard divisor latch */ | |
334 | static int au_serial_dl_read(struct uart_8250_port *up) | |
335 | { | |
336 | return __raw_readl(up->port.membase + 0x28); | |
337 | } | |
338 | ||
339 | static void au_serial_dl_write(struct uart_8250_port *up, int value) | |
340 | { | |
341 | __raw_writel(value, up->port.membase + 0x28); | |
21c614a7 PA |
342 | } |
343 | ||
6b416031 MD |
344 | #endif |
345 | ||
28bf4cf2 | 346 | #ifdef CONFIG_SERIAL_8250_RM9K |
bd71c182 TK |
347 | |
348 | static const u8 | |
349 | regmap_in[8] = { | |
350 | [UART_RX] = 0x00, | |
351 | [UART_IER] = 0x0c, | |
352 | [UART_IIR] = 0x14, | |
353 | [UART_LCR] = 0x1c, | |
354 | [UART_MCR] = 0x20, | |
355 | [UART_LSR] = 0x24, | |
356 | [UART_MSR] = 0x28, | |
357 | [UART_SCR] = 0x2c | |
358 | }, | |
359 | regmap_out[8] = { | |
360 | [UART_TX] = 0x04, | |
361 | [UART_IER] = 0x0c, | |
362 | [UART_FCR] = 0x18, | |
363 | [UART_LCR] = 0x1c, | |
364 | [UART_MCR] = 0x20, | |
365 | [UART_LSR] = 0x24, | |
366 | [UART_MSR] = 0x28, | |
367 | [UART_SCR] = 0x2c | |
368 | }; | |
369 | ||
28bf4cf2 | 370 | static unsigned int rm9k_serial_in(struct uart_port *p, int offset) |
bd71c182 | 371 | { |
28bf4cf2 MD |
372 | offset = regmap_in[offset] << p->regshift; |
373 | return readl(p->membase + offset); | |
bd71c182 TK |
374 | } |
375 | ||
28bf4cf2 | 376 | static void rm9k_serial_out(struct uart_port *p, int offset, int value) |
bd71c182 | 377 | { |
28bf4cf2 MD |
378 | offset = regmap_out[offset] << p->regshift; |
379 | writel(value, p->membase + offset); | |
bd71c182 TK |
380 | } |
381 | ||
28bf4cf2 MD |
382 | static int rm9k_serial_dl_read(struct uart_8250_port *up) |
383 | { | |
384 | return ((__raw_readl(up->port.membase + 0x10) << 8) | | |
385 | (__raw_readl(up->port.membase + 0x08) & 0xff)) & 0xffff; | |
386 | } | |
387 | ||
388 | static void rm9k_serial_dl_write(struct uart_8250_port *up, int value) | |
389 | { | |
390 | __raw_writel(value, up->port.membase + 0x08); | |
391 | __raw_writel(value >> 8, up->port.membase + 0x10); | |
392 | } | |
393 | ||
394 | #endif | |
21c614a7 | 395 | |
7d6a07d1 | 396 | static unsigned int hub6_serial_in(struct uart_port *p, int offset) |
1da177e4 | 397 | { |
e8155629 | 398 | offset = offset << p->regshift; |
7d6a07d1 DD |
399 | outb(p->hub6 - 1 + offset, p->iobase); |
400 | return inb(p->iobase + 1); | |
401 | } | |
1da177e4 | 402 | |
7d6a07d1 DD |
403 | static void hub6_serial_out(struct uart_port *p, int offset, int value) |
404 | { | |
e8155629 | 405 | offset = offset << p->regshift; |
7d6a07d1 DD |
406 | outb(p->hub6 - 1 + offset, p->iobase); |
407 | outb(value, p->iobase + 1); | |
408 | } | |
1da177e4 | 409 | |
7d6a07d1 DD |
410 | static unsigned int mem_serial_in(struct uart_port *p, int offset) |
411 | { | |
e8155629 | 412 | offset = offset << p->regshift; |
7d6a07d1 DD |
413 | return readb(p->membase + offset); |
414 | } | |
1da177e4 | 415 | |
7d6a07d1 DD |
416 | static void mem_serial_out(struct uart_port *p, int offset, int value) |
417 | { | |
e8155629 | 418 | offset = offset << p->regshift; |
7d6a07d1 DD |
419 | writeb(value, p->membase + offset); |
420 | } | |
421 | ||
422 | static void mem32_serial_out(struct uart_port *p, int offset, int value) | |
423 | { | |
e8155629 | 424 | offset = offset << p->regshift; |
7d6a07d1 DD |
425 | writel(value, p->membase + offset); |
426 | } | |
427 | ||
428 | static unsigned int mem32_serial_in(struct uart_port *p, int offset) | |
429 | { | |
e8155629 | 430 | offset = offset << p->regshift; |
7d6a07d1 DD |
431 | return readl(p->membase + offset); |
432 | } | |
1da177e4 | 433 | |
7d6a07d1 DD |
434 | static unsigned int io_serial_in(struct uart_port *p, int offset) |
435 | { | |
e8155629 | 436 | offset = offset << p->regshift; |
7d6a07d1 DD |
437 | return inb(p->iobase + offset); |
438 | } | |
439 | ||
440 | static void io_serial_out(struct uart_port *p, int offset, int value) | |
441 | { | |
e8155629 | 442 | offset = offset << p->regshift; |
7d6a07d1 DD |
443 | outb(value, p->iobase + offset); |
444 | } | |
445 | ||
583d28e9 JI |
446 | static int serial8250_default_handle_irq(struct uart_port *port); |
447 | ||
7d6a07d1 DD |
448 | static void set_io_from_upio(struct uart_port *p) |
449 | { | |
49d5741b JI |
450 | struct uart_8250_port *up = |
451 | container_of(p, struct uart_8250_port, port); | |
cc419fa0 | 452 | |
e8155629 MD |
453 | up->dl_read = default_serial_dl_read; |
454 | up->dl_write = default_serial_dl_write; | |
cc419fa0 | 455 | |
7d6a07d1 | 456 | switch (p->iotype) { |
1da177e4 | 457 | case UPIO_HUB6: |
7d6a07d1 DD |
458 | p->serial_in = hub6_serial_in; |
459 | p->serial_out = hub6_serial_out; | |
1da177e4 LT |
460 | break; |
461 | ||
462 | case UPIO_MEM: | |
7d6a07d1 DD |
463 | p->serial_in = mem_serial_in; |
464 | p->serial_out = mem_serial_out; | |
1da177e4 LT |
465 | break; |
466 | ||
467 | case UPIO_MEM32: | |
7d6a07d1 DD |
468 | p->serial_in = mem32_serial_in; |
469 | p->serial_out = mem32_serial_out; | |
1da177e4 LT |
470 | break; |
471 | ||
28bf4cf2 MD |
472 | #ifdef CONFIG_SERIAL_8250_RM9K |
473 | case UPIO_RM9000: | |
474 | p->serial_in = rm9k_serial_in; | |
475 | p->serial_out = rm9k_serial_out; | |
476 | up->dl_read = rm9k_serial_dl_read; | |
477 | up->dl_write = rm9k_serial_dl_write; | |
478 | break; | |
479 | #endif | |
480 | ||
6b416031 | 481 | #ifdef CONFIG_MIPS_ALCHEMY |
21c614a7 | 482 | case UPIO_AU: |
7d6a07d1 DD |
483 | p->serial_in = au_serial_in; |
484 | p->serial_out = au_serial_out; | |
6b416031 MD |
485 | up->dl_read = au_serial_dl_read; |
486 | up->dl_write = au_serial_dl_write; | |
21c614a7 | 487 | break; |
6b416031 | 488 | #endif |
12bf3f24 | 489 | |
1da177e4 | 490 | default: |
7d6a07d1 DD |
491 | p->serial_in = io_serial_in; |
492 | p->serial_out = io_serial_out; | |
493 | break; | |
1da177e4 | 494 | } |
b8e7e40a AC |
495 | /* Remember loaded iotype */ |
496 | up->cur_iotype = p->iotype; | |
583d28e9 | 497 | p->handle_irq = serial8250_default_handle_irq; |
1da177e4 LT |
498 | } |
499 | ||
40b36daa | 500 | static void |
55e4016d | 501 | serial_port_out_sync(struct uart_port *p, int offset, int value) |
40b36daa | 502 | { |
7d6a07d1 | 503 | switch (p->iotype) { |
40b36daa AW |
504 | case UPIO_MEM: |
505 | case UPIO_MEM32: | |
40b36daa | 506 | case UPIO_AU: |
7d6a07d1 DD |
507 | p->serial_out(p, offset, value); |
508 | p->serial_in(p, UART_LCR); /* safe, no side-effects */ | |
40b36daa AW |
509 | break; |
510 | default: | |
7d6a07d1 | 511 | p->serial_out(p, offset, value); |
40b36daa AW |
512 | } |
513 | } | |
514 | ||
1da177e4 LT |
515 | /* |
516 | * For the 16C950 | |
517 | */ | |
518 | static void serial_icr_write(struct uart_8250_port *up, int offset, int value) | |
519 | { | |
520 | serial_out(up, UART_SCR, offset); | |
521 | serial_out(up, UART_ICR, value); | |
522 | } | |
523 | ||
524 | static unsigned int serial_icr_read(struct uart_8250_port *up, int offset) | |
525 | { | |
526 | unsigned int value; | |
527 | ||
528 | serial_icr_write(up, UART_ACR, up->acr | UART_ACR_ICRRD); | |
529 | serial_out(up, UART_SCR, offset); | |
530 | value = serial_in(up, UART_ICR); | |
531 | serial_icr_write(up, UART_ACR, up->acr); | |
532 | ||
533 | return value; | |
534 | } | |
535 | ||
536 | /* | |
537 | * FIFO support. | |
538 | */ | |
b5d674ab | 539 | static void serial8250_clear_fifos(struct uart_8250_port *p) |
1da177e4 LT |
540 | { |
541 | if (p->capabilities & UART_CAP_FIFO) { | |
0acf519f PG |
542 | serial_out(p, UART_FCR, UART_FCR_ENABLE_FIFO); |
543 | serial_out(p, UART_FCR, UART_FCR_ENABLE_FIFO | | |
1da177e4 | 544 | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT); |
0acf519f | 545 | serial_out(p, UART_FCR, 0); |
1da177e4 LT |
546 | } |
547 | } | |
548 | ||
0ad372b9 SM |
549 | void serial8250_clear_and_reinit_fifos(struct uart_8250_port *p) |
550 | { | |
551 | unsigned char fcr; | |
552 | ||
553 | serial8250_clear_fifos(p); | |
554 | fcr = uart_config[p->port.type].fcr; | |
555 | serial_out(p, UART_FCR, fcr); | |
556 | } | |
557 | EXPORT_SYMBOL_GPL(serial8250_clear_and_reinit_fifos); | |
558 | ||
1da177e4 LT |
559 | /* |
560 | * IER sleep support. UARTs which have EFRs need the "extended | |
561 | * capability" bit enabled. Note that on XR16C850s, we need to | |
562 | * reset LCR to write to IER. | |
563 | */ | |
b5d674ab | 564 | static void serial8250_set_sleep(struct uart_8250_port *p, int sleep) |
1da177e4 LT |
565 | { |
566 | if (p->capabilities & UART_CAP_SLEEP) { | |
567 | if (p->capabilities & UART_CAP_EFR) { | |
0acf519f PG |
568 | serial_out(p, UART_LCR, UART_LCR_CONF_MODE_B); |
569 | serial_out(p, UART_EFR, UART_EFR_ECB); | |
570 | serial_out(p, UART_LCR, 0); | |
1da177e4 | 571 | } |
0acf519f | 572 | serial_out(p, UART_IER, sleep ? UART_IERX_SLEEP : 0); |
1da177e4 | 573 | if (p->capabilities & UART_CAP_EFR) { |
0acf519f PG |
574 | serial_out(p, UART_LCR, UART_LCR_CONF_MODE_B); |
575 | serial_out(p, UART_EFR, 0); | |
576 | serial_out(p, UART_LCR, 0); | |
1da177e4 LT |
577 | } |
578 | } | |
579 | } | |
580 | ||
581 | #ifdef CONFIG_SERIAL_8250_RSA | |
582 | /* | |
583 | * Attempts to turn on the RSA FIFO. Returns zero on failure. | |
584 | * We set the port uart clock rate if we succeed. | |
585 | */ | |
586 | static int __enable_rsa(struct uart_8250_port *up) | |
587 | { | |
588 | unsigned char mode; | |
589 | int result; | |
590 | ||
0acf519f | 591 | mode = serial_in(up, UART_RSA_MSR); |
1da177e4 LT |
592 | result = mode & UART_RSA_MSR_FIFO; |
593 | ||
594 | if (!result) { | |
0acf519f PG |
595 | serial_out(up, UART_RSA_MSR, mode | UART_RSA_MSR_FIFO); |
596 | mode = serial_in(up, UART_RSA_MSR); | |
1da177e4 LT |
597 | result = mode & UART_RSA_MSR_FIFO; |
598 | } | |
599 | ||
600 | if (result) | |
601 | up->port.uartclk = SERIAL_RSA_BAUD_BASE * 16; | |
602 | ||
603 | return result; | |
604 | } | |
605 | ||
606 | static void enable_rsa(struct uart_8250_port *up) | |
607 | { | |
608 | if (up->port.type == PORT_RSA) { | |
609 | if (up->port.uartclk != SERIAL_RSA_BAUD_BASE * 16) { | |
610 | spin_lock_irq(&up->port.lock); | |
611 | __enable_rsa(up); | |
612 | spin_unlock_irq(&up->port.lock); | |
613 | } | |
614 | if (up->port.uartclk == SERIAL_RSA_BAUD_BASE * 16) | |
0acf519f | 615 | serial_out(up, UART_RSA_FRR, 0); |
1da177e4 LT |
616 | } |
617 | } | |
618 | ||
619 | /* | |
620 | * Attempts to turn off the RSA FIFO. Returns zero on failure. | |
621 | * It is unknown why interrupts were disabled in here. However, | |
622 | * the caller is expected to preserve this behaviour by grabbing | |
623 | * the spinlock before calling this function. | |
624 | */ | |
625 | static void disable_rsa(struct uart_8250_port *up) | |
626 | { | |
627 | unsigned char mode; | |
628 | int result; | |
629 | ||
630 | if (up->port.type == PORT_RSA && | |
631 | up->port.uartclk == SERIAL_RSA_BAUD_BASE * 16) { | |
632 | spin_lock_irq(&up->port.lock); | |
633 | ||
0acf519f | 634 | mode = serial_in(up, UART_RSA_MSR); |
1da177e4 LT |
635 | result = !(mode & UART_RSA_MSR_FIFO); |
636 | ||
637 | if (!result) { | |
0acf519f PG |
638 | serial_out(up, UART_RSA_MSR, mode & ~UART_RSA_MSR_FIFO); |
639 | mode = serial_in(up, UART_RSA_MSR); | |
1da177e4 LT |
640 | result = !(mode & UART_RSA_MSR_FIFO); |
641 | } | |
642 | ||
643 | if (result) | |
644 | up->port.uartclk = SERIAL_RSA_BAUD_BASE_LO * 16; | |
645 | spin_unlock_irq(&up->port.lock); | |
646 | } | |
647 | } | |
648 | #endif /* CONFIG_SERIAL_8250_RSA */ | |
649 | ||
650 | /* | |
651 | * This is a quickie test to see how big the FIFO is. | |
652 | * It doesn't work at all the time, more's the pity. | |
653 | */ | |
654 | static int size_fifo(struct uart_8250_port *up) | |
655 | { | |
b32b19b8 JAH |
656 | unsigned char old_fcr, old_mcr, old_lcr; |
657 | unsigned short old_dl; | |
1da177e4 LT |
658 | int count; |
659 | ||
0acf519f PG |
660 | old_lcr = serial_in(up, UART_LCR); |
661 | serial_out(up, UART_LCR, 0); | |
662 | old_fcr = serial_in(up, UART_FCR); | |
663 | old_mcr = serial_in(up, UART_MCR); | |
664 | serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO | | |
1da177e4 | 665 | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT); |
0acf519f PG |
666 | serial_out(up, UART_MCR, UART_MCR_LOOP); |
667 | serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); | |
b32b19b8 JAH |
668 | old_dl = serial_dl_read(up); |
669 | serial_dl_write(up, 0x0001); | |
0acf519f | 670 | serial_out(up, UART_LCR, 0x03); |
1da177e4 | 671 | for (count = 0; count < 256; count++) |
0acf519f | 672 | serial_out(up, UART_TX, count); |
1da177e4 | 673 | mdelay(20);/* FIXME - schedule_timeout */ |
0acf519f | 674 | for (count = 0; (serial_in(up, UART_LSR) & UART_LSR_DR) && |
1da177e4 | 675 | (count < 256); count++) |
0acf519f PG |
676 | serial_in(up, UART_RX); |
677 | serial_out(up, UART_FCR, old_fcr); | |
678 | serial_out(up, UART_MCR, old_mcr); | |
679 | serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); | |
b32b19b8 | 680 | serial_dl_write(up, old_dl); |
0acf519f | 681 | serial_out(up, UART_LCR, old_lcr); |
1da177e4 LT |
682 | |
683 | return count; | |
684 | } | |
685 | ||
686 | /* | |
687 | * Read UART ID using the divisor method - set DLL and DLM to zero | |
688 | * and the revision will be in DLL and device type in DLM. We | |
689 | * preserve the device state across this. | |
690 | */ | |
691 | static unsigned int autoconfig_read_divisor_id(struct uart_8250_port *p) | |
692 | { | |
693 | unsigned char old_dll, old_dlm, old_lcr; | |
694 | unsigned int id; | |
695 | ||
0acf519f PG |
696 | old_lcr = serial_in(p, UART_LCR); |
697 | serial_out(p, UART_LCR, UART_LCR_CONF_MODE_A); | |
1da177e4 | 698 | |
0acf519f PG |
699 | old_dll = serial_in(p, UART_DLL); |
700 | old_dlm = serial_in(p, UART_DLM); | |
1da177e4 | 701 | |
0acf519f PG |
702 | serial_out(p, UART_DLL, 0); |
703 | serial_out(p, UART_DLM, 0); | |
1da177e4 | 704 | |
0acf519f | 705 | id = serial_in(p, UART_DLL) | serial_in(p, UART_DLM) << 8; |
1da177e4 | 706 | |
0acf519f PG |
707 | serial_out(p, UART_DLL, old_dll); |
708 | serial_out(p, UART_DLM, old_dlm); | |
709 | serial_out(p, UART_LCR, old_lcr); | |
1da177e4 LT |
710 | |
711 | return id; | |
712 | } | |
713 | ||
714 | /* | |
715 | * This is a helper routine to autodetect StarTech/Exar/Oxsemi UART's. | |
716 | * When this function is called we know it is at least a StarTech | |
717 | * 16650 V2, but it might be one of several StarTech UARTs, or one of | |
718 | * its clones. (We treat the broken original StarTech 16650 V1 as a | |
719 | * 16550, and why not? Startech doesn't seem to even acknowledge its | |
720 | * existence.) | |
bd71c182 | 721 | * |
1da177e4 LT |
722 | * What evil have men's minds wrought... |
723 | */ | |
724 | static void autoconfig_has_efr(struct uart_8250_port *up) | |
725 | { | |
726 | unsigned int id1, id2, id3, rev; | |
727 | ||
728 | /* | |
729 | * Everything with an EFR has SLEEP | |
730 | */ | |
731 | up->capabilities |= UART_CAP_EFR | UART_CAP_SLEEP; | |
732 | ||
733 | /* | |
734 | * First we check to see if it's an Oxford Semiconductor UART. | |
735 | * | |
736 | * If we have to do this here because some non-National | |
737 | * Semiconductor clone chips lock up if you try writing to the | |
738 | * LSR register (which serial_icr_read does) | |
739 | */ | |
740 | ||
741 | /* | |
742 | * Check for Oxford Semiconductor 16C950. | |
743 | * | |
744 | * EFR [4] must be set else this test fails. | |
745 | * | |
746 | * This shouldn't be necessary, but Mike Hudson (Exoray@isys.ca) | |
747 | * claims that it's needed for 952 dual UART's (which are not | |
748 | * recommended for new designs). | |
749 | */ | |
750 | up->acr = 0; | |
662b083a | 751 | serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); |
1da177e4 LT |
752 | serial_out(up, UART_EFR, UART_EFR_ECB); |
753 | serial_out(up, UART_LCR, 0x00); | |
754 | id1 = serial_icr_read(up, UART_ID1); | |
755 | id2 = serial_icr_read(up, UART_ID2); | |
756 | id3 = serial_icr_read(up, UART_ID3); | |
757 | rev = serial_icr_read(up, UART_REV); | |
758 | ||
759 | DEBUG_AUTOCONF("950id=%02x:%02x:%02x:%02x ", id1, id2, id3, rev); | |
760 | ||
761 | if (id1 == 0x16 && id2 == 0xC9 && | |
762 | (id3 == 0x50 || id3 == 0x52 || id3 == 0x54)) { | |
763 | up->port.type = PORT_16C950; | |
4ba5e35d RK |
764 | |
765 | /* | |
766 | * Enable work around for the Oxford Semiconductor 952 rev B | |
767 | * chip which causes it to seriously miscalculate baud rates | |
768 | * when DLL is 0. | |
769 | */ | |
770 | if (id3 == 0x52 && rev == 0x01) | |
771 | up->bugs |= UART_BUG_QUOT; | |
1da177e4 LT |
772 | return; |
773 | } | |
bd71c182 | 774 | |
1da177e4 LT |
775 | /* |
776 | * We check for a XR16C850 by setting DLL and DLM to 0, and then | |
777 | * reading back DLL and DLM. The chip type depends on the DLM | |
778 | * value read back: | |
779 | * 0x10 - XR16C850 and the DLL contains the chip revision. | |
780 | * 0x12 - XR16C2850. | |
781 | * 0x14 - XR16C854. | |
782 | */ | |
783 | id1 = autoconfig_read_divisor_id(up); | |
784 | DEBUG_AUTOCONF("850id=%04x ", id1); | |
785 | ||
786 | id2 = id1 >> 8; | |
787 | if (id2 == 0x10 || id2 == 0x12 || id2 == 0x14) { | |
1da177e4 LT |
788 | up->port.type = PORT_16850; |
789 | return; | |
790 | } | |
791 | ||
792 | /* | |
793 | * It wasn't an XR16C850. | |
794 | * | |
795 | * We distinguish between the '654 and the '650 by counting | |
796 | * how many bytes are in the FIFO. I'm using this for now, | |
797 | * since that's the technique that was sent to me in the | |
798 | * serial driver update, but I'm not convinced this works. | |
799 | * I've had problems doing this in the past. -TYT | |
800 | */ | |
801 | if (size_fifo(up) == 64) | |
802 | up->port.type = PORT_16654; | |
803 | else | |
804 | up->port.type = PORT_16650V2; | |
805 | } | |
806 | ||
807 | /* | |
808 | * We detected a chip without a FIFO. Only two fall into | |
809 | * this category - the original 8250 and the 16450. The | |
810 | * 16450 has a scratch register (accessible with LCR=0) | |
811 | */ | |
812 | static void autoconfig_8250(struct uart_8250_port *up) | |
813 | { | |
814 | unsigned char scratch, status1, status2; | |
815 | ||
816 | up->port.type = PORT_8250; | |
817 | ||
818 | scratch = serial_in(up, UART_SCR); | |
0acf519f | 819 | serial_out(up, UART_SCR, 0xa5); |
1da177e4 | 820 | status1 = serial_in(up, UART_SCR); |
0acf519f | 821 | serial_out(up, UART_SCR, 0x5a); |
1da177e4 | 822 | status2 = serial_in(up, UART_SCR); |
0acf519f | 823 | serial_out(up, UART_SCR, scratch); |
1da177e4 LT |
824 | |
825 | if (status1 == 0xa5 && status2 == 0x5a) | |
826 | up->port.type = PORT_16450; | |
827 | } | |
828 | ||
829 | static int broken_efr(struct uart_8250_port *up) | |
830 | { | |
831 | /* | |
832 | * Exar ST16C2550 "A2" devices incorrectly detect as | |
833 | * having an EFR, and report an ID of 0x0201. See | |
631dd1a8 | 834 | * http://linux.derkeiler.com/Mailing-Lists/Kernel/2004-11/4812.html |
1da177e4 LT |
835 | */ |
836 | if (autoconfig_read_divisor_id(up) == 0x0201 && size_fifo(up) == 16) | |
837 | return 1; | |
838 | ||
839 | return 0; | |
840 | } | |
841 | ||
0d0389e5 YK |
842 | static inline int ns16550a_goto_highspeed(struct uart_8250_port *up) |
843 | { | |
844 | unsigned char status; | |
845 | ||
846 | status = serial_in(up, 0x04); /* EXCR2 */ | |
847 | #define PRESL(x) ((x) & 0x30) | |
848 | if (PRESL(status) == 0x10) { | |
849 | /* already in high speed mode */ | |
850 | return 0; | |
851 | } else { | |
852 | status &= ~0xB0; /* Disable LOCK, mask out PRESL[01] */ | |
853 | status |= 0x10; /* 1.625 divisor for baud_base --> 921600 */ | |
0acf519f | 854 | serial_out(up, 0x04, status); |
0d0389e5 YK |
855 | } |
856 | return 1; | |
857 | } | |
858 | ||
1da177e4 LT |
859 | /* |
860 | * We know that the chip has FIFOs. Does it have an EFR? The | |
861 | * EFR is located in the same register position as the IIR and | |
862 | * we know the top two bits of the IIR are currently set. The | |
863 | * EFR should contain zero. Try to read the EFR. | |
864 | */ | |
865 | static void autoconfig_16550a(struct uart_8250_port *up) | |
866 | { | |
867 | unsigned char status1, status2; | |
868 | unsigned int iersave; | |
869 | ||
870 | up->port.type = PORT_16550A; | |
871 | up->capabilities |= UART_CAP_FIFO; | |
872 | ||
873 | /* | |
874 | * Check for presence of the EFR when DLAB is set. | |
875 | * Only ST16C650V1 UARTs pass this test. | |
876 | */ | |
0acf519f | 877 | serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); |
1da177e4 | 878 | if (serial_in(up, UART_EFR) == 0) { |
0acf519f | 879 | serial_out(up, UART_EFR, 0xA8); |
1da177e4 LT |
880 | if (serial_in(up, UART_EFR) != 0) { |
881 | DEBUG_AUTOCONF("EFRv1 "); | |
882 | up->port.type = PORT_16650; | |
883 | up->capabilities |= UART_CAP_EFR | UART_CAP_SLEEP; | |
884 | } else { | |
885 | DEBUG_AUTOCONF("Motorola 8xxx DUART "); | |
886 | } | |
0acf519f | 887 | serial_out(up, UART_EFR, 0); |
1da177e4 LT |
888 | return; |
889 | } | |
890 | ||
891 | /* | |
892 | * Maybe it requires 0xbf to be written to the LCR. | |
893 | * (other ST16C650V2 UARTs, TI16C752A, etc) | |
894 | */ | |
0acf519f | 895 | serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); |
1da177e4 LT |
896 | if (serial_in(up, UART_EFR) == 0 && !broken_efr(up)) { |
897 | DEBUG_AUTOCONF("EFRv2 "); | |
898 | autoconfig_has_efr(up); | |
899 | return; | |
900 | } | |
901 | ||
902 | /* | |
903 | * Check for a National Semiconductor SuperIO chip. | |
904 | * Attempt to switch to bank 2, read the value of the LOOP bit | |
905 | * from EXCR1. Switch back to bank 0, change it in MCR. Then | |
906 | * switch back to bank 2, read it from EXCR1 again and check | |
907 | * it's changed. If so, set baud_base in EXCR2 to 921600. -- dwmw2 | |
1da177e4 | 908 | */ |
0acf519f | 909 | serial_out(up, UART_LCR, 0); |
1da177e4 | 910 | status1 = serial_in(up, UART_MCR); |
0acf519f | 911 | serial_out(up, UART_LCR, 0xE0); |
1da177e4 LT |
912 | status2 = serial_in(up, 0x02); /* EXCR1 */ |
913 | ||
914 | if (!((status2 ^ status1) & UART_MCR_LOOP)) { | |
0acf519f PG |
915 | serial_out(up, UART_LCR, 0); |
916 | serial_out(up, UART_MCR, status1 ^ UART_MCR_LOOP); | |
917 | serial_out(up, UART_LCR, 0xE0); | |
1da177e4 | 918 | status2 = serial_in(up, 0x02); /* EXCR1 */ |
0acf519f PG |
919 | serial_out(up, UART_LCR, 0); |
920 | serial_out(up, UART_MCR, status1); | |
1da177e4 LT |
921 | |
922 | if ((status2 ^ status1) & UART_MCR_LOOP) { | |
857dde2e DW |
923 | unsigned short quot; |
924 | ||
0acf519f | 925 | serial_out(up, UART_LCR, 0xE0); |
857dde2e | 926 | |
b32b19b8 | 927 | quot = serial_dl_read(up); |
857dde2e DW |
928 | quot <<= 3; |
929 | ||
0d0389e5 YK |
930 | if (ns16550a_goto_highspeed(up)) |
931 | serial_dl_write(up, quot); | |
857dde2e | 932 | |
0acf519f | 933 | serial_out(up, UART_LCR, 0); |
1da177e4 | 934 | |
857dde2e | 935 | up->port.uartclk = 921600*16; |
1da177e4 LT |
936 | up->port.type = PORT_NS16550A; |
937 | up->capabilities |= UART_NATSEMI; | |
938 | return; | |
939 | } | |
940 | } | |
941 | ||
942 | /* | |
943 | * No EFR. Try to detect a TI16750, which only sets bit 5 of | |
944 | * the IIR when 64 byte FIFO mode is enabled when DLAB is set. | |
945 | * Try setting it with and without DLAB set. Cheap clones | |
946 | * set bit 5 without DLAB set. | |
947 | */ | |
0acf519f PG |
948 | serial_out(up, UART_LCR, 0); |
949 | serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO | UART_FCR7_64BYTE); | |
1da177e4 | 950 | status1 = serial_in(up, UART_IIR) >> 5; |
0acf519f PG |
951 | serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO); |
952 | serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); | |
953 | serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO | UART_FCR7_64BYTE); | |
1da177e4 | 954 | status2 = serial_in(up, UART_IIR) >> 5; |
0acf519f PG |
955 | serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO); |
956 | serial_out(up, UART_LCR, 0); | |
1da177e4 LT |
957 | |
958 | DEBUG_AUTOCONF("iir1=%d iir2=%d ", status1, status2); | |
959 | ||
960 | if (status1 == 6 && status2 == 7) { | |
961 | up->port.type = PORT_16750; | |
962 | up->capabilities |= UART_CAP_AFE | UART_CAP_SLEEP; | |
963 | return; | |
964 | } | |
965 | ||
966 | /* | |
967 | * Try writing and reading the UART_IER_UUE bit (b6). | |
968 | * If it works, this is probably one of the Xscale platform's | |
969 | * internal UARTs. | |
970 | * We're going to explicitly set the UUE bit to 0 before | |
971 | * trying to write and read a 1 just to make sure it's not | |
972 | * already a 1 and maybe locked there before we even start start. | |
973 | */ | |
974 | iersave = serial_in(up, UART_IER); | |
0acf519f | 975 | serial_out(up, UART_IER, iersave & ~UART_IER_UUE); |
1da177e4 LT |
976 | if (!(serial_in(up, UART_IER) & UART_IER_UUE)) { |
977 | /* | |
978 | * OK it's in a known zero state, try writing and reading | |
979 | * without disturbing the current state of the other bits. | |
980 | */ | |
0acf519f | 981 | serial_out(up, UART_IER, iersave | UART_IER_UUE); |
1da177e4 LT |
982 | if (serial_in(up, UART_IER) & UART_IER_UUE) { |
983 | /* | |
984 | * It's an Xscale. | |
985 | * We'll leave the UART_IER_UUE bit set to 1 (enabled). | |
986 | */ | |
987 | DEBUG_AUTOCONF("Xscale "); | |
988 | up->port.type = PORT_XSCALE; | |
5568181f | 989 | up->capabilities |= UART_CAP_UUE | UART_CAP_RTOIE; |
1da177e4 LT |
990 | return; |
991 | } | |
992 | } else { | |
993 | /* | |
994 | * If we got here we couldn't force the IER_UUE bit to 0. | |
995 | * Log it and continue. | |
996 | */ | |
997 | DEBUG_AUTOCONF("Couldn't force IER_UUE to 0 "); | |
998 | } | |
0acf519f | 999 | serial_out(up, UART_IER, iersave); |
235dae5d | 1000 | |
06315348 SH |
1001 | /* |
1002 | * Exar uarts have EFR in a weird location | |
1003 | */ | |
1004 | if (up->port.flags & UPF_EXAR_EFR) { | |
1005 | up->port.type = PORT_XR17D15X; | |
1006 | up->capabilities |= UART_CAP_AFE | UART_CAP_EFR; | |
1007 | } | |
1008 | ||
235dae5d PL |
1009 | /* |
1010 | * We distinguish between 16550A and U6 16550A by counting | |
1011 | * how many bytes are in the FIFO. | |
1012 | */ | |
1013 | if (up->port.type == PORT_16550A && size_fifo(up) == 64) { | |
1014 | up->port.type = PORT_U6_16550A; | |
1015 | up->capabilities |= UART_CAP_AFE; | |
1016 | } | |
1da177e4 LT |
1017 | } |
1018 | ||
1019 | /* | |
1020 | * This routine is called by rs_init() to initialize a specific serial | |
1021 | * port. It determines what type of UART chip this serial port is | |
1022 | * using: 8250, 16450, 16550, 16550A. The important question is | |
1023 | * whether or not this UART is a 16550A or not, since this will | |
1024 | * determine whether or not we can use its FIFO features or not. | |
1025 | */ | |
1026 | static void autoconfig(struct uart_8250_port *up, unsigned int probeflags) | |
1027 | { | |
1028 | unsigned char status1, scratch, scratch2, scratch3; | |
1029 | unsigned char save_lcr, save_mcr; | |
dfe42443 | 1030 | struct uart_port *port = &up->port; |
1da177e4 LT |
1031 | unsigned long flags; |
1032 | ||
dfe42443 | 1033 | if (!port->iobase && !port->mapbase && !port->membase) |
1da177e4 LT |
1034 | return; |
1035 | ||
80647b95 | 1036 | DEBUG_AUTOCONF("ttyS%d: autoconf (0x%04lx, 0x%p): ", |
dfe42443 | 1037 | serial_index(port), port->iobase, port->membase); |
1da177e4 LT |
1038 | |
1039 | /* | |
1040 | * We really do need global IRQs disabled here - we're going to | |
1041 | * be frobbing the chips IRQ enable register to see if it exists. | |
1042 | */ | |
dfe42443 | 1043 | spin_lock_irqsave(&port->lock, flags); |
1da177e4 LT |
1044 | |
1045 | up->capabilities = 0; | |
4ba5e35d | 1046 | up->bugs = 0; |
1da177e4 | 1047 | |
dfe42443 | 1048 | if (!(port->flags & UPF_BUGGY_UART)) { |
1da177e4 LT |
1049 | /* |
1050 | * Do a simple existence test first; if we fail this, | |
1051 | * there's no point trying anything else. | |
bd71c182 | 1052 | * |
1da177e4 LT |
1053 | * 0x80 is used as a nonsense port to prevent against |
1054 | * false positives due to ISA bus float. The | |
1055 | * assumption is that 0x80 is a non-existent port; | |
1056 | * which should be safe since include/asm/io.h also | |
1057 | * makes this assumption. | |
1058 | * | |
1059 | * Note: this is safe as long as MCR bit 4 is clear | |
1060 | * and the device is in "PC" mode. | |
1061 | */ | |
0acf519f PG |
1062 | scratch = serial_in(up, UART_IER); |
1063 | serial_out(up, UART_IER, 0); | |
1da177e4 LT |
1064 | #ifdef __i386__ |
1065 | outb(0xff, 0x080); | |
1066 | #endif | |
48212008 TH |
1067 | /* |
1068 | * Mask out IER[7:4] bits for test as some UARTs (e.g. TL | |
1069 | * 16C754B) allow only to modify them if an EFR bit is set. | |
1070 | */ | |
0acf519f PG |
1071 | scratch2 = serial_in(up, UART_IER) & 0x0f; |
1072 | serial_out(up, UART_IER, 0x0F); | |
1da177e4 LT |
1073 | #ifdef __i386__ |
1074 | outb(0, 0x080); | |
1075 | #endif | |
0acf519f PG |
1076 | scratch3 = serial_in(up, UART_IER) & 0x0f; |
1077 | serial_out(up, UART_IER, scratch); | |
1da177e4 LT |
1078 | if (scratch2 != 0 || scratch3 != 0x0F) { |
1079 | /* | |
1080 | * We failed; there's nothing here | |
1081 | */ | |
1082 | DEBUG_AUTOCONF("IER test failed (%02x, %02x) ", | |
1083 | scratch2, scratch3); | |
1084 | goto out; | |
1085 | } | |
1086 | } | |
1087 | ||
1088 | save_mcr = serial_in(up, UART_MCR); | |
1089 | save_lcr = serial_in(up, UART_LCR); | |
1090 | ||
bd71c182 | 1091 | /* |
1da177e4 LT |
1092 | * Check to see if a UART is really there. Certain broken |
1093 | * internal modems based on the Rockwell chipset fail this | |
1094 | * test, because they apparently don't implement the loopback | |
1095 | * test mode. So this test is skipped on the COM 1 through | |
1096 | * COM 4 ports. This *should* be safe, since no board | |
1097 | * manufacturer would be stupid enough to design a board | |
1098 | * that conflicts with COM 1-4 --- we hope! | |
1099 | */ | |
dfe42443 | 1100 | if (!(port->flags & UPF_SKIP_TEST)) { |
0acf519f PG |
1101 | serial_out(up, UART_MCR, UART_MCR_LOOP | 0x0A); |
1102 | status1 = serial_in(up, UART_MSR) & 0xF0; | |
1103 | serial_out(up, UART_MCR, save_mcr); | |
1da177e4 LT |
1104 | if (status1 != 0x90) { |
1105 | DEBUG_AUTOCONF("LOOP test failed (%02x) ", | |
1106 | status1); | |
1107 | goto out; | |
1108 | } | |
1109 | } | |
1110 | ||
1111 | /* | |
1112 | * We're pretty sure there's a port here. Lets find out what | |
1113 | * type of port it is. The IIR top two bits allows us to find | |
6f0d618f | 1114 | * out if it's 8250 or 16450, 16550, 16550A or later. This |
1da177e4 LT |
1115 | * determines what we test for next. |
1116 | * | |
1117 | * We also initialise the EFR (if any) to zero for later. The | |
1118 | * EFR occupies the same register location as the FCR and IIR. | |
1119 | */ | |
0acf519f PG |
1120 | serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); |
1121 | serial_out(up, UART_EFR, 0); | |
1122 | serial_out(up, UART_LCR, 0); | |
1da177e4 | 1123 | |
0acf519f | 1124 | serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO); |
1da177e4 LT |
1125 | scratch = serial_in(up, UART_IIR) >> 6; |
1126 | ||
1127 | DEBUG_AUTOCONF("iir=%d ", scratch); | |
1128 | ||
1129 | switch (scratch) { | |
1130 | case 0: | |
1131 | autoconfig_8250(up); | |
1132 | break; | |
1133 | case 1: | |
dfe42443 | 1134 | port->type = PORT_UNKNOWN; |
1da177e4 LT |
1135 | break; |
1136 | case 2: | |
dfe42443 | 1137 | port->type = PORT_16550; |
1da177e4 LT |
1138 | break; |
1139 | case 3: | |
1140 | autoconfig_16550a(up); | |
1141 | break; | |
1142 | } | |
1143 | ||
1144 | #ifdef CONFIG_SERIAL_8250_RSA | |
1145 | /* | |
1146 | * Only probe for RSA ports if we got the region. | |
1147 | */ | |
dfe42443 | 1148 | if (port->type == PORT_16550A && probeflags & PROBE_RSA) { |
1da177e4 LT |
1149 | int i; |
1150 | ||
1151 | for (i = 0 ; i < probe_rsa_count; ++i) { | |
dfe42443 PG |
1152 | if (probe_rsa[i] == port->iobase && __enable_rsa(up)) { |
1153 | port->type = PORT_RSA; | |
1da177e4 LT |
1154 | break; |
1155 | } | |
1156 | } | |
1157 | } | |
1158 | #endif | |
21c614a7 | 1159 | |
0acf519f | 1160 | serial_out(up, UART_LCR, save_lcr); |
1da177e4 | 1161 | |
dfe42443 | 1162 | if (up->capabilities != uart_config[port->type].flags) { |
1da177e4 LT |
1163 | printk(KERN_WARNING |
1164 | "ttyS%d: detected caps %08x should be %08x\n", | |
dfe42443 PG |
1165 | serial_index(port), up->capabilities, |
1166 | uart_config[port->type].flags); | |
1da177e4 LT |
1167 | } |
1168 | ||
dfe42443 PG |
1169 | port->fifosize = uart_config[up->port.type].fifo_size; |
1170 | up->capabilities = uart_config[port->type].flags; | |
1171 | up->tx_loadsz = uart_config[port->type].tx_loadsz; | |
1da177e4 | 1172 | |
dfe42443 | 1173 | if (port->type == PORT_UNKNOWN) |
1da177e4 LT |
1174 | goto out; |
1175 | ||
1176 | /* | |
1177 | * Reset the UART. | |
1178 | */ | |
1179 | #ifdef CONFIG_SERIAL_8250_RSA | |
dfe42443 | 1180 | if (port->type == PORT_RSA) |
0acf519f | 1181 | serial_out(up, UART_RSA_FRR, 0); |
1da177e4 | 1182 | #endif |
0acf519f | 1183 | serial_out(up, UART_MCR, save_mcr); |
1da177e4 | 1184 | serial8250_clear_fifos(up); |
40b36daa | 1185 | serial_in(up, UART_RX); |
5c8c755c | 1186 | if (up->capabilities & UART_CAP_UUE) |
0acf519f | 1187 | serial_out(up, UART_IER, UART_IER_UUE); |
5c8c755c | 1188 | else |
0acf519f | 1189 | serial_out(up, UART_IER, 0); |
1da177e4 | 1190 | |
bd71c182 | 1191 | out: |
dfe42443 PG |
1192 | spin_unlock_irqrestore(&port->lock, flags); |
1193 | DEBUG_AUTOCONF("type=%s\n", uart_config[port->type].name); | |
1da177e4 LT |
1194 | } |
1195 | ||
1196 | static void autoconfig_irq(struct uart_8250_port *up) | |
1197 | { | |
dfe42443 | 1198 | struct uart_port *port = &up->port; |
1da177e4 LT |
1199 | unsigned char save_mcr, save_ier; |
1200 | unsigned char save_ICP = 0; | |
1201 | unsigned int ICP = 0; | |
1202 | unsigned long irqs; | |
1203 | int irq; | |
1204 | ||
dfe42443 PG |
1205 | if (port->flags & UPF_FOURPORT) { |
1206 | ICP = (port->iobase & 0xfe0) | 0x1f; | |
1da177e4 LT |
1207 | save_ICP = inb_p(ICP); |
1208 | outb_p(0x80, ICP); | |
0d263a26 | 1209 | inb_p(ICP); |
1da177e4 LT |
1210 | } |
1211 | ||
1212 | /* forget possible initially masked and pending IRQ */ | |
1213 | probe_irq_off(probe_irq_on()); | |
0acf519f PG |
1214 | save_mcr = serial_in(up, UART_MCR); |
1215 | save_ier = serial_in(up, UART_IER); | |
1216 | serial_out(up, UART_MCR, UART_MCR_OUT1 | UART_MCR_OUT2); | |
bd71c182 | 1217 | |
1da177e4 | 1218 | irqs = probe_irq_on(); |
0acf519f | 1219 | serial_out(up, UART_MCR, 0); |
6f803cd0 | 1220 | udelay(10); |
dfe42443 | 1221 | if (port->flags & UPF_FOURPORT) { |
0acf519f | 1222 | serial_out(up, UART_MCR, |
1da177e4 LT |
1223 | UART_MCR_DTR | UART_MCR_RTS); |
1224 | } else { | |
0acf519f | 1225 | serial_out(up, UART_MCR, |
1da177e4 LT |
1226 | UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2); |
1227 | } | |
0acf519f | 1228 | serial_out(up, UART_IER, 0x0f); /* enable all intrs */ |
0d263a26 PG |
1229 | serial_in(up, UART_LSR); |
1230 | serial_in(up, UART_RX); | |
1231 | serial_in(up, UART_IIR); | |
1232 | serial_in(up, UART_MSR); | |
0acf519f | 1233 | serial_out(up, UART_TX, 0xFF); |
6f803cd0 | 1234 | udelay(20); |
1da177e4 LT |
1235 | irq = probe_irq_off(irqs); |
1236 | ||
0acf519f PG |
1237 | serial_out(up, UART_MCR, save_mcr); |
1238 | serial_out(up, UART_IER, save_ier); | |
1da177e4 | 1239 | |
dfe42443 | 1240 | if (port->flags & UPF_FOURPORT) |
1da177e4 LT |
1241 | outb_p(save_ICP, ICP); |
1242 | ||
dfe42443 | 1243 | port->irq = (irq > 0) ? irq : 0; |
1da177e4 LT |
1244 | } |
1245 | ||
e763b90c RK |
1246 | static inline void __stop_tx(struct uart_8250_port *p) |
1247 | { | |
1248 | if (p->ier & UART_IER_THRI) { | |
1249 | p->ier &= ~UART_IER_THRI; | |
1250 | serial_out(p, UART_IER, p->ier); | |
1251 | } | |
1252 | } | |
1253 | ||
b129a8cc | 1254 | static void serial8250_stop_tx(struct uart_port *port) |
1da177e4 | 1255 | { |
49d5741b JI |
1256 | struct uart_8250_port *up = |
1257 | container_of(port, struct uart_8250_port, port); | |
1da177e4 | 1258 | |
e763b90c | 1259 | __stop_tx(up); |
1da177e4 LT |
1260 | |
1261 | /* | |
e763b90c | 1262 | * We really want to stop the transmitter from sending. |
1da177e4 | 1263 | */ |
dfe42443 | 1264 | if (port->type == PORT_16C950) { |
1da177e4 LT |
1265 | up->acr |= UART_ACR_TXDIS; |
1266 | serial_icr_write(up, UART_ACR, up->acr); | |
1267 | } | |
1268 | } | |
1269 | ||
b129a8cc | 1270 | static void serial8250_start_tx(struct uart_port *port) |
1da177e4 | 1271 | { |
49d5741b JI |
1272 | struct uart_8250_port *up = |
1273 | container_of(port, struct uart_8250_port, port); | |
1da177e4 LT |
1274 | |
1275 | if (!(up->ier & UART_IER_THRI)) { | |
1276 | up->ier |= UART_IER_THRI; | |
4fd996a1 | 1277 | serial_port_out(port, UART_IER, up->ier); |
55d3b282 | 1278 | |
67f7654e | 1279 | if (up->bugs & UART_BUG_TXEN) { |
68cb4f8e | 1280 | unsigned char lsr; |
55d3b282 | 1281 | lsr = serial_in(up, UART_LSR); |
ad4c2aa6 | 1282 | up->lsr_saved_flags |= lsr & LSR_SAVE_FLAGS; |
dfe42443 | 1283 | if ((port->type == PORT_RM9000) ? |
68cb4f8e IJ |
1284 | (lsr & UART_LSR_THRE) : |
1285 | (lsr & UART_LSR_TEMT)) | |
3986fb2b | 1286 | serial8250_tx_chars(up); |
55d3b282 | 1287 | } |
1da177e4 | 1288 | } |
e763b90c | 1289 | |
1da177e4 | 1290 | /* |
e763b90c | 1291 | * Re-enable the transmitter if we disabled it. |
1da177e4 | 1292 | */ |
dfe42443 | 1293 | if (port->type == PORT_16C950 && up->acr & UART_ACR_TXDIS) { |
1da177e4 LT |
1294 | up->acr &= ~UART_ACR_TXDIS; |
1295 | serial_icr_write(up, UART_ACR, up->acr); | |
1296 | } | |
1297 | } | |
1298 | ||
1299 | static void serial8250_stop_rx(struct uart_port *port) | |
1300 | { | |
49d5741b JI |
1301 | struct uart_8250_port *up = |
1302 | container_of(port, struct uart_8250_port, port); | |
1da177e4 LT |
1303 | |
1304 | up->ier &= ~UART_IER_RLSI; | |
1305 | up->port.read_status_mask &= ~UART_LSR_DR; | |
4fd996a1 | 1306 | serial_port_out(port, UART_IER, up->ier); |
1da177e4 LT |
1307 | } |
1308 | ||
1309 | static void serial8250_enable_ms(struct uart_port *port) | |
1310 | { | |
49d5741b JI |
1311 | struct uart_8250_port *up = |
1312 | container_of(port, struct uart_8250_port, port); | |
1da177e4 | 1313 | |
21c614a7 PA |
1314 | /* no MSR capabilities */ |
1315 | if (up->bugs & UART_BUG_NOMSR) | |
1316 | return; | |
1317 | ||
1da177e4 | 1318 | up->ier |= UART_IER_MSI; |
4fd996a1 | 1319 | serial_port_out(port, UART_IER, up->ier); |
1da177e4 LT |
1320 | } |
1321 | ||
0690f41f | 1322 | /* |
3986fb2b | 1323 | * serial8250_rx_chars: processes according to the passed in LSR |
0690f41f PG |
1324 | * value, and returns the remaining LSR bits not handled |
1325 | * by this Rx routine. | |
1326 | */ | |
3986fb2b PG |
1327 | unsigned char |
1328 | serial8250_rx_chars(struct uart_8250_port *up, unsigned char lsr) | |
1da177e4 | 1329 | { |
dfe42443 PG |
1330 | struct uart_port *port = &up->port; |
1331 | struct tty_struct *tty = port->state->port.tty; | |
0690f41f | 1332 | unsigned char ch; |
1da177e4 LT |
1333 | int max_count = 256; |
1334 | char flag; | |
1335 | ||
1336 | do { | |
7500b1f6 | 1337 | if (likely(lsr & UART_LSR_DR)) |
0acf519f | 1338 | ch = serial_in(up, UART_RX); |
7500b1f6 AR |
1339 | else |
1340 | /* | |
1341 | * Intel 82571 has a Serial Over Lan device that will | |
1342 | * set UART_LSR_BI without setting UART_LSR_DR when | |
1343 | * it receives a break. To avoid reading from the | |
1344 | * receive buffer without UART_LSR_DR bit set, we | |
1345 | * just force the read character to be 0 | |
1346 | */ | |
1347 | ch = 0; | |
1348 | ||
1da177e4 | 1349 | flag = TTY_NORMAL; |
dfe42443 | 1350 | port->icount.rx++; |
1da177e4 | 1351 | |
ad4c2aa6 CM |
1352 | lsr |= up->lsr_saved_flags; |
1353 | up->lsr_saved_flags = 0; | |
1da177e4 | 1354 | |
ad4c2aa6 | 1355 | if (unlikely(lsr & UART_LSR_BRK_ERROR_BITS)) { |
1da177e4 LT |
1356 | if (lsr & UART_LSR_BI) { |
1357 | lsr &= ~(UART_LSR_FE | UART_LSR_PE); | |
dfe42443 | 1358 | port->icount.brk++; |
1da177e4 LT |
1359 | /* |
1360 | * We do the SysRQ and SAK checking | |
1361 | * here because otherwise the break | |
1362 | * may get masked by ignore_status_mask | |
1363 | * or read_status_mask. | |
1364 | */ | |
dfe42443 | 1365 | if (uart_handle_break(port)) |
1da177e4 LT |
1366 | goto ignore_char; |
1367 | } else if (lsr & UART_LSR_PE) | |
dfe42443 | 1368 | port->icount.parity++; |
1da177e4 | 1369 | else if (lsr & UART_LSR_FE) |
dfe42443 | 1370 | port->icount.frame++; |
1da177e4 | 1371 | if (lsr & UART_LSR_OE) |
dfe42443 | 1372 | port->icount.overrun++; |
1da177e4 LT |
1373 | |
1374 | /* | |
23907eb8 | 1375 | * Mask off conditions which should be ignored. |
1da177e4 | 1376 | */ |
dfe42443 | 1377 | lsr &= port->read_status_mask; |
1da177e4 LT |
1378 | |
1379 | if (lsr & UART_LSR_BI) { | |
1380 | DEBUG_INTR("handling break...."); | |
1381 | flag = TTY_BREAK; | |
1382 | } else if (lsr & UART_LSR_PE) | |
1383 | flag = TTY_PARITY; | |
1384 | else if (lsr & UART_LSR_FE) | |
1385 | flag = TTY_FRAME; | |
1386 | } | |
dfe42443 | 1387 | if (uart_handle_sysrq_char(port, ch)) |
1da177e4 | 1388 | goto ignore_char; |
05ab3014 | 1389 | |
dfe42443 | 1390 | uart_insert_char(port, lsr, UART_LSR_OE, ch, flag); |
05ab3014 | 1391 | |
6f803cd0 | 1392 | ignore_char: |
0acf519f | 1393 | lsr = serial_in(up, UART_LSR); |
7500b1f6 | 1394 | } while ((lsr & (UART_LSR_DR | UART_LSR_BI)) && (max_count-- > 0)); |
dfe42443 | 1395 | spin_unlock(&port->lock); |
1da177e4 | 1396 | tty_flip_buffer_push(tty); |
dfe42443 | 1397 | spin_lock(&port->lock); |
0690f41f | 1398 | return lsr; |
1da177e4 | 1399 | } |
3986fb2b | 1400 | EXPORT_SYMBOL_GPL(serial8250_rx_chars); |
1da177e4 | 1401 | |
3986fb2b | 1402 | void serial8250_tx_chars(struct uart_8250_port *up) |
1da177e4 | 1403 | { |
dfe42443 PG |
1404 | struct uart_port *port = &up->port; |
1405 | struct circ_buf *xmit = &port->state->xmit; | |
1da177e4 LT |
1406 | int count; |
1407 | ||
dfe42443 PG |
1408 | if (port->x_char) { |
1409 | serial_out(up, UART_TX, port->x_char); | |
1410 | port->icount.tx++; | |
1411 | port->x_char = 0; | |
1da177e4 LT |
1412 | return; |
1413 | } | |
dfe42443 PG |
1414 | if (uart_tx_stopped(port)) { |
1415 | serial8250_stop_tx(port); | |
b129a8cc RK |
1416 | return; |
1417 | } | |
1418 | if (uart_circ_empty(xmit)) { | |
e763b90c | 1419 | __stop_tx(up); |
1da177e4 LT |
1420 | return; |
1421 | } | |
1422 | ||
1423 | count = up->tx_loadsz; | |
1424 | do { | |
1425 | serial_out(up, UART_TX, xmit->buf[xmit->tail]); | |
1426 | xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); | |
dfe42443 | 1427 | port->icount.tx++; |
1da177e4 LT |
1428 | if (uart_circ_empty(xmit)) |
1429 | break; | |
1430 | } while (--count > 0); | |
1431 | ||
1432 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) | |
dfe42443 | 1433 | uart_write_wakeup(port); |
1da177e4 LT |
1434 | |
1435 | DEBUG_INTR("THRE..."); | |
1436 | ||
1437 | if (uart_circ_empty(xmit)) | |
e763b90c | 1438 | __stop_tx(up); |
1da177e4 | 1439 | } |
3986fb2b | 1440 | EXPORT_SYMBOL_GPL(serial8250_tx_chars); |
1da177e4 | 1441 | |
3986fb2b | 1442 | unsigned int serial8250_modem_status(struct uart_8250_port *up) |
1da177e4 | 1443 | { |
dfe42443 | 1444 | struct uart_port *port = &up->port; |
2af7cd68 RK |
1445 | unsigned int status = serial_in(up, UART_MSR); |
1446 | ||
ad4c2aa6 CM |
1447 | status |= up->msr_saved_flags; |
1448 | up->msr_saved_flags = 0; | |
fdc30b3d | 1449 | if (status & UART_MSR_ANY_DELTA && up->ier & UART_IER_MSI && |
dfe42443 | 1450 | port->state != NULL) { |
2af7cd68 | 1451 | if (status & UART_MSR_TERI) |
dfe42443 | 1452 | port->icount.rng++; |
2af7cd68 | 1453 | if (status & UART_MSR_DDSR) |
dfe42443 | 1454 | port->icount.dsr++; |
2af7cd68 | 1455 | if (status & UART_MSR_DDCD) |
dfe42443 | 1456 | uart_handle_dcd_change(port, status & UART_MSR_DCD); |
2af7cd68 | 1457 | if (status & UART_MSR_DCTS) |
dfe42443 | 1458 | uart_handle_cts_change(port, status & UART_MSR_CTS); |
2af7cd68 | 1459 | |
dfe42443 | 1460 | wake_up_interruptible(&port->state->port.delta_msr_wait); |
2af7cd68 | 1461 | } |
1da177e4 | 1462 | |
2af7cd68 | 1463 | return status; |
1da177e4 | 1464 | } |
3986fb2b | 1465 | EXPORT_SYMBOL_GPL(serial8250_modem_status); |
1da177e4 LT |
1466 | |
1467 | /* | |
1468 | * This handles the interrupt from one port. | |
1469 | */ | |
86b21199 | 1470 | int serial8250_handle_irq(struct uart_port *port, unsigned int iir) |
1da177e4 | 1471 | { |
0690f41f | 1472 | unsigned char status; |
4bf3631c | 1473 | unsigned long flags; |
86b21199 PG |
1474 | struct uart_8250_port *up = |
1475 | container_of(port, struct uart_8250_port, port); | |
1476 | ||
1477 | if (iir & UART_IIR_NO_INT) | |
1478 | return 0; | |
45e24601 | 1479 | |
dfe42443 | 1480 | spin_lock_irqsave(&port->lock, flags); |
45e24601 | 1481 | |
4fd996a1 | 1482 | status = serial_port_in(port, UART_LSR); |
1da177e4 LT |
1483 | |
1484 | DEBUG_INTR("status = %x...", status); | |
1485 | ||
7500b1f6 | 1486 | if (status & (UART_LSR_DR | UART_LSR_BI)) |
3986fb2b PG |
1487 | status = serial8250_rx_chars(up, status); |
1488 | serial8250_modem_status(up); | |
1da177e4 | 1489 | if (status & UART_LSR_THRE) |
3986fb2b | 1490 | serial8250_tx_chars(up); |
45e24601 | 1491 | |
dfe42443 | 1492 | spin_unlock_irqrestore(&port->lock, flags); |
86b21199 | 1493 | return 1; |
583d28e9 | 1494 | } |
c7a1bdc5 | 1495 | EXPORT_SYMBOL_GPL(serial8250_handle_irq); |
583d28e9 JI |
1496 | |
1497 | static int serial8250_default_handle_irq(struct uart_port *port) | |
1498 | { | |
4fd996a1 | 1499 | unsigned int iir = serial_port_in(port, UART_IIR); |
583d28e9 JI |
1500 | |
1501 | return serial8250_handle_irq(port, iir); | |
1502 | } | |
1503 | ||
1da177e4 LT |
1504 | /* |
1505 | * This is the serial driver's interrupt routine. | |
1506 | * | |
1507 | * Arjan thinks the old way was overly complex, so it got simplified. | |
1508 | * Alan disagrees, saying that need the complexity to handle the weird | |
1509 | * nature of ISA shared interrupts. (This is a special exception.) | |
1510 | * | |
1511 | * In order to handle ISA shared interrupts properly, we need to check | |
1512 | * that all ports have been serviced, and therefore the ISA interrupt | |
1513 | * line has been de-asserted. | |
1514 | * | |
1515 | * This means we need to loop through all ports. checking that they | |
1516 | * don't have an interrupt pending. | |
1517 | */ | |
7d12e780 | 1518 | static irqreturn_t serial8250_interrupt(int irq, void *dev_id) |
1da177e4 LT |
1519 | { |
1520 | struct irq_info *i = dev_id; | |
1521 | struct list_head *l, *end = NULL; | |
1522 | int pass_counter = 0, handled = 0; | |
1523 | ||
1524 | DEBUG_INTR("serial8250_interrupt(%d)...", irq); | |
1525 | ||
1526 | spin_lock(&i->lock); | |
1527 | ||
1528 | l = i->head; | |
1529 | do { | |
1530 | struct uart_8250_port *up; | |
583d28e9 | 1531 | struct uart_port *port; |
1da177e4 LT |
1532 | |
1533 | up = list_entry(l, struct uart_8250_port, list); | |
583d28e9 | 1534 | port = &up->port; |
1da177e4 | 1535 | |
49b532f9 | 1536 | if (port->handle_irq(port)) { |
1da177e4 | 1537 | handled = 1; |
1da177e4 LT |
1538 | end = NULL; |
1539 | } else if (end == NULL) | |
1540 | end = l; | |
1541 | ||
1542 | l = l->next; | |
1543 | ||
1544 | if (l == i->head && pass_counter++ > PASS_LIMIT) { | |
1545 | /* If we hit this, we're dead. */ | |
cd3ecad1 DD |
1546 | printk_ratelimited(KERN_ERR |
1547 | "serial8250: too much work for irq%d\n", irq); | |
1da177e4 LT |
1548 | break; |
1549 | } | |
1550 | } while (l != end); | |
1551 | ||
1552 | spin_unlock(&i->lock); | |
1553 | ||
1554 | DEBUG_INTR("end.\n"); | |
1555 | ||
1556 | return IRQ_RETVAL(handled); | |
1557 | } | |
1558 | ||
1559 | /* | |
1560 | * To support ISA shared interrupts, we need to have one interrupt | |
1561 | * handler that ensures that the IRQ line has been deasserted | |
1562 | * before returning. Failing to do this will result in the IRQ | |
1563 | * line being stuck active, and, since ISA irqs are edge triggered, | |
1564 | * no more IRQs will be seen. | |
1565 | */ | |
1566 | static void serial_do_unlink(struct irq_info *i, struct uart_8250_port *up) | |
1567 | { | |
1568 | spin_lock_irq(&i->lock); | |
1569 | ||
1570 | if (!list_empty(i->head)) { | |
1571 | if (i->head == &up->list) | |
1572 | i->head = i->head->next; | |
1573 | list_del(&up->list); | |
1574 | } else { | |
1575 | BUG_ON(i->head != &up->list); | |
1576 | i->head = NULL; | |
1577 | } | |
1da177e4 | 1578 | spin_unlock_irq(&i->lock); |
25db8ad5 AC |
1579 | /* List empty so throw away the hash node */ |
1580 | if (i->head == NULL) { | |
1581 | hlist_del(&i->node); | |
1582 | kfree(i); | |
1583 | } | |
1da177e4 LT |
1584 | } |
1585 | ||
1586 | static int serial_link_irq_chain(struct uart_8250_port *up) | |
1587 | { | |
25db8ad5 AC |
1588 | struct hlist_head *h; |
1589 | struct hlist_node *n; | |
1590 | struct irq_info *i; | |
40663cc7 | 1591 | int ret, irq_flags = up->port.flags & UPF_SHARE_IRQ ? IRQF_SHARED : 0; |
1da177e4 | 1592 | |
25db8ad5 AC |
1593 | mutex_lock(&hash_mutex); |
1594 | ||
1595 | h = &irq_lists[up->port.irq % NR_IRQ_HASH]; | |
1596 | ||
1597 | hlist_for_each(n, h) { | |
1598 | i = hlist_entry(n, struct irq_info, node); | |
1599 | if (i->irq == up->port.irq) | |
1600 | break; | |
1601 | } | |
1602 | ||
1603 | if (n == NULL) { | |
1604 | i = kzalloc(sizeof(struct irq_info), GFP_KERNEL); | |
1605 | if (i == NULL) { | |
1606 | mutex_unlock(&hash_mutex); | |
1607 | return -ENOMEM; | |
1608 | } | |
1609 | spin_lock_init(&i->lock); | |
1610 | i->irq = up->port.irq; | |
1611 | hlist_add_head(&i->node, h); | |
1612 | } | |
1613 | mutex_unlock(&hash_mutex); | |
1614 | ||
1da177e4 LT |
1615 | spin_lock_irq(&i->lock); |
1616 | ||
1617 | if (i->head) { | |
1618 | list_add(&up->list, i->head); | |
1619 | spin_unlock_irq(&i->lock); | |
1620 | ||
1621 | ret = 0; | |
1622 | } else { | |
1623 | INIT_LIST_HEAD(&up->list); | |
1624 | i->head = &up->list; | |
1625 | spin_unlock_irq(&i->lock); | |
1c2f0493 | 1626 | irq_flags |= up->port.irqflags; |
1da177e4 LT |
1627 | ret = request_irq(up->port.irq, serial8250_interrupt, |
1628 | irq_flags, "serial", i); | |
1629 | if (ret < 0) | |
1630 | serial_do_unlink(i, up); | |
1631 | } | |
1632 | ||
1633 | return ret; | |
1634 | } | |
1635 | ||
1636 | static void serial_unlink_irq_chain(struct uart_8250_port *up) | |
1637 | { | |
25db8ad5 AC |
1638 | struct irq_info *i; |
1639 | struct hlist_node *n; | |
1640 | struct hlist_head *h; | |
1da177e4 | 1641 | |
25db8ad5 AC |
1642 | mutex_lock(&hash_mutex); |
1643 | ||
1644 | h = &irq_lists[up->port.irq % NR_IRQ_HASH]; | |
1645 | ||
1646 | hlist_for_each(n, h) { | |
1647 | i = hlist_entry(n, struct irq_info, node); | |
1648 | if (i->irq == up->port.irq) | |
1649 | break; | |
1650 | } | |
1651 | ||
1652 | BUG_ON(n == NULL); | |
1da177e4 LT |
1653 | BUG_ON(i->head == NULL); |
1654 | ||
1655 | if (list_empty(i->head)) | |
1656 | free_irq(up->port.irq, i); | |
1657 | ||
1658 | serial_do_unlink(i, up); | |
25db8ad5 | 1659 | mutex_unlock(&hash_mutex); |
1da177e4 LT |
1660 | } |
1661 | ||
1662 | /* | |
1663 | * This function is used to handle ports that do not have an | |
1664 | * interrupt. This doesn't work very well for 16450's, but gives | |
1665 | * barely passable results for a 16550A. (Although at the expense | |
1666 | * of much CPU overhead). | |
1667 | */ | |
1668 | static void serial8250_timeout(unsigned long data) | |
1669 | { | |
1670 | struct uart_8250_port *up = (struct uart_8250_port *)data; | |
1da177e4 | 1671 | |
a0431476 | 1672 | up->port.handle_irq(&up->port); |
54381067 | 1673 | mod_timer(&up->timer, jiffies + uart_poll_timeout(&up->port)); |
40b36daa AW |
1674 | } |
1675 | ||
1676 | static void serial8250_backup_timeout(unsigned long data) | |
1677 | { | |
1678 | struct uart_8250_port *up = (struct uart_8250_port *)data; | |
ad4c2aa6 CM |
1679 | unsigned int iir, ier = 0, lsr; |
1680 | unsigned long flags; | |
40b36daa | 1681 | |
dbb3b1ca AC |
1682 | spin_lock_irqsave(&up->port.lock, flags); |
1683 | ||
40b36daa AW |
1684 | /* |
1685 | * Must disable interrupts or else we risk racing with the interrupt | |
1686 | * based handler. | |
1687 | */ | |
d4e33fac | 1688 | if (up->port.irq) { |
40b36daa AW |
1689 | ier = serial_in(up, UART_IER); |
1690 | serial_out(up, UART_IER, 0); | |
1691 | } | |
1da177e4 | 1692 | |
40b36daa AW |
1693 | iir = serial_in(up, UART_IIR); |
1694 | ||
1695 | /* | |
1696 | * This should be a safe test for anyone who doesn't trust the | |
1697 | * IIR bits on their UART, but it's specifically designed for | |
1698 | * the "Diva" UART used on the management processor on many HP | |
1699 | * ia64 and parisc boxes. | |
1700 | */ | |
ad4c2aa6 CM |
1701 | lsr = serial_in(up, UART_LSR); |
1702 | up->lsr_saved_flags |= lsr & LSR_SAVE_FLAGS; | |
40b36daa | 1703 | if ((iir & UART_IIR_NO_INT) && (up->ier & UART_IER_THRI) && |
ebd2c8f6 | 1704 | (!uart_circ_empty(&up->port.state->xmit) || up->port.x_char) && |
ad4c2aa6 | 1705 | (lsr & UART_LSR_THRE)) { |
40b36daa AW |
1706 | iir &= ~(UART_IIR_ID | UART_IIR_NO_INT); |
1707 | iir |= UART_IIR_THRI; | |
1708 | } | |
1709 | ||
1710 | if (!(iir & UART_IIR_NO_INT)) | |
3986fb2b | 1711 | serial8250_tx_chars(up); |
40b36daa | 1712 | |
d4e33fac | 1713 | if (up->port.irq) |
40b36daa AW |
1714 | serial_out(up, UART_IER, ier); |
1715 | ||
dbb3b1ca AC |
1716 | spin_unlock_irqrestore(&up->port.lock, flags); |
1717 | ||
40b36daa | 1718 | /* Standard timer interval plus 0.2s to keep the port running */ |
6f803cd0 | 1719 | mod_timer(&up->timer, |
54381067 | 1720 | jiffies + uart_poll_timeout(&up->port) + HZ / 5); |
1da177e4 LT |
1721 | } |
1722 | ||
1723 | static unsigned int serial8250_tx_empty(struct uart_port *port) | |
1724 | { | |
49d5741b JI |
1725 | struct uart_8250_port *up = |
1726 | container_of(port, struct uart_8250_port, port); | |
1da177e4 | 1727 | unsigned long flags; |
ad4c2aa6 | 1728 | unsigned int lsr; |
1da177e4 | 1729 | |
dfe42443 | 1730 | spin_lock_irqsave(&port->lock, flags); |
4fd996a1 | 1731 | lsr = serial_port_in(port, UART_LSR); |
ad4c2aa6 | 1732 | up->lsr_saved_flags |= lsr & LSR_SAVE_FLAGS; |
dfe42443 | 1733 | spin_unlock_irqrestore(&port->lock, flags); |
1da177e4 | 1734 | |
bca47613 | 1735 | return (lsr & BOTH_EMPTY) == BOTH_EMPTY ? TIOCSER_TEMT : 0; |
1da177e4 LT |
1736 | } |
1737 | ||
1738 | static unsigned int serial8250_get_mctrl(struct uart_port *port) | |
1739 | { | |
49d5741b JI |
1740 | struct uart_8250_port *up = |
1741 | container_of(port, struct uart_8250_port, port); | |
2af7cd68 | 1742 | unsigned int status; |
1da177e4 LT |
1743 | unsigned int ret; |
1744 | ||
3986fb2b | 1745 | status = serial8250_modem_status(up); |
1da177e4 LT |
1746 | |
1747 | ret = 0; | |
1748 | if (status & UART_MSR_DCD) | |
1749 | ret |= TIOCM_CAR; | |
1750 | if (status & UART_MSR_RI) | |
1751 | ret |= TIOCM_RNG; | |
1752 | if (status & UART_MSR_DSR) | |
1753 | ret |= TIOCM_DSR; | |
1754 | if (status & UART_MSR_CTS) | |
1755 | ret |= TIOCM_CTS; | |
1756 | return ret; | |
1757 | } | |
1758 | ||
1759 | static void serial8250_set_mctrl(struct uart_port *port, unsigned int mctrl) | |
1760 | { | |
49d5741b JI |
1761 | struct uart_8250_port *up = |
1762 | container_of(port, struct uart_8250_port, port); | |
1da177e4 LT |
1763 | unsigned char mcr = 0; |
1764 | ||
1765 | if (mctrl & TIOCM_RTS) | |
1766 | mcr |= UART_MCR_RTS; | |
1767 | if (mctrl & TIOCM_DTR) | |
1768 | mcr |= UART_MCR_DTR; | |
1769 | if (mctrl & TIOCM_OUT1) | |
1770 | mcr |= UART_MCR_OUT1; | |
1771 | if (mctrl & TIOCM_OUT2) | |
1772 | mcr |= UART_MCR_OUT2; | |
1773 | if (mctrl & TIOCM_LOOP) | |
1774 | mcr |= UART_MCR_LOOP; | |
1775 | ||
1776 | mcr = (mcr & up->mcr_mask) | up->mcr_force | up->mcr; | |
1777 | ||
4fd996a1 | 1778 | serial_port_out(port, UART_MCR, mcr); |
1da177e4 LT |
1779 | } |
1780 | ||
1781 | static void serial8250_break_ctl(struct uart_port *port, int break_state) | |
1782 | { | |
49d5741b JI |
1783 | struct uart_8250_port *up = |
1784 | container_of(port, struct uart_8250_port, port); | |
1da177e4 LT |
1785 | unsigned long flags; |
1786 | ||
dfe42443 | 1787 | spin_lock_irqsave(&port->lock, flags); |
1da177e4 LT |
1788 | if (break_state == -1) |
1789 | up->lcr |= UART_LCR_SBC; | |
1790 | else | |
1791 | up->lcr &= ~UART_LCR_SBC; | |
4fd996a1 | 1792 | serial_port_out(port, UART_LCR, up->lcr); |
dfe42443 | 1793 | spin_unlock_irqrestore(&port->lock, flags); |
1da177e4 LT |
1794 | } |
1795 | ||
40b36daa AW |
1796 | /* |
1797 | * Wait for transmitter & holding register to empty | |
1798 | */ | |
b5d674ab | 1799 | static void wait_for_xmitr(struct uart_8250_port *up, int bits) |
40b36daa AW |
1800 | { |
1801 | unsigned int status, tmout = 10000; | |
1802 | ||
1803 | /* Wait up to 10ms for the character(s) to be sent. */ | |
97d303b7 | 1804 | for (;;) { |
40b36daa AW |
1805 | status = serial_in(up, UART_LSR); |
1806 | ||
ad4c2aa6 | 1807 | up->lsr_saved_flags |= status & LSR_SAVE_FLAGS; |
40b36daa | 1808 | |
97d303b7 DD |
1809 | if ((status & bits) == bits) |
1810 | break; | |
40b36daa AW |
1811 | if (--tmout == 0) |
1812 | break; | |
1813 | udelay(1); | |
97d303b7 | 1814 | } |
40b36daa AW |
1815 | |
1816 | /* Wait up to 1s for flow control if necessary */ | |
1817 | if (up->port.flags & UPF_CONS_FLOW) { | |
ad4c2aa6 CM |
1818 | unsigned int tmout; |
1819 | for (tmout = 1000000; tmout; tmout--) { | |
1820 | unsigned int msr = serial_in(up, UART_MSR); | |
1821 | up->msr_saved_flags |= msr & MSR_SAVE_FLAGS; | |
1822 | if (msr & UART_MSR_CTS) | |
1823 | break; | |
40b36daa AW |
1824 | udelay(1); |
1825 | touch_nmi_watchdog(); | |
1826 | } | |
1827 | } | |
1828 | } | |
1829 | ||
f2d937f3 JW |
1830 | #ifdef CONFIG_CONSOLE_POLL |
1831 | /* | |
1832 | * Console polling routines for writing and reading from the uart while | |
1833 | * in an interrupt or debug context. | |
1834 | */ | |
1835 | ||
1836 | static int serial8250_get_poll_char(struct uart_port *port) | |
1837 | { | |
4fd996a1 | 1838 | unsigned char lsr = serial_port_in(port, UART_LSR); |
f2d937f3 | 1839 | |
f5316b4a JW |
1840 | if (!(lsr & UART_LSR_DR)) |
1841 | return NO_POLL_CHAR; | |
f2d937f3 | 1842 | |
4fd996a1 | 1843 | return serial_port_in(port, UART_RX); |
f2d937f3 JW |
1844 | } |
1845 | ||
1846 | ||
1847 | static void serial8250_put_poll_char(struct uart_port *port, | |
1848 | unsigned char c) | |
1849 | { | |
1850 | unsigned int ier; | |
49d5741b JI |
1851 | struct uart_8250_port *up = |
1852 | container_of(port, struct uart_8250_port, port); | |
f2d937f3 JW |
1853 | |
1854 | /* | |
1855 | * First save the IER then disable the interrupts | |
1856 | */ | |
4fd996a1 | 1857 | ier = serial_port_in(port, UART_IER); |
f2d937f3 | 1858 | if (up->capabilities & UART_CAP_UUE) |
4fd996a1 | 1859 | serial_port_out(port, UART_IER, UART_IER_UUE); |
f2d937f3 | 1860 | else |
4fd996a1 | 1861 | serial_port_out(port, UART_IER, 0); |
f2d937f3 JW |
1862 | |
1863 | wait_for_xmitr(up, BOTH_EMPTY); | |
1864 | /* | |
1865 | * Send the character out. | |
1866 | * If a LF, also do CR... | |
1867 | */ | |
4fd996a1 | 1868 | serial_port_out(port, UART_TX, c); |
f2d937f3 JW |
1869 | if (c == 10) { |
1870 | wait_for_xmitr(up, BOTH_EMPTY); | |
4fd996a1 | 1871 | serial_port_out(port, UART_TX, 13); |
f2d937f3 JW |
1872 | } |
1873 | ||
1874 | /* | |
1875 | * Finally, wait for transmitter to become empty | |
1876 | * and restore the IER | |
1877 | */ | |
1878 | wait_for_xmitr(up, BOTH_EMPTY); | |
4fd996a1 | 1879 | serial_port_out(port, UART_IER, ier); |
f2d937f3 JW |
1880 | } |
1881 | ||
1882 | #endif /* CONFIG_CONSOLE_POLL */ | |
1883 | ||
1da177e4 LT |
1884 | static int serial8250_startup(struct uart_port *port) |
1885 | { | |
49d5741b JI |
1886 | struct uart_8250_port *up = |
1887 | container_of(port, struct uart_8250_port, port); | |
1da177e4 | 1888 | unsigned long flags; |
55d3b282 | 1889 | unsigned char lsr, iir; |
1da177e4 LT |
1890 | int retval; |
1891 | ||
dfe42443 | 1892 | port->fifosize = uart_config[up->port.type].fifo_size; |
e4f05af1 | 1893 | up->tx_loadsz = uart_config[up->port.type].tx_loadsz; |
1da177e4 LT |
1894 | up->capabilities = uart_config[up->port.type].flags; |
1895 | up->mcr = 0; | |
1896 | ||
dfe42443 | 1897 | if (port->iotype != up->cur_iotype) |
b8e7e40a AC |
1898 | set_io_from_upio(port); |
1899 | ||
dfe42443 | 1900 | if (port->type == PORT_16C950) { |
1da177e4 LT |
1901 | /* Wake up and initialize UART */ |
1902 | up->acr = 0; | |
4fd996a1 PG |
1903 | serial_port_out(port, UART_LCR, UART_LCR_CONF_MODE_B); |
1904 | serial_port_out(port, UART_EFR, UART_EFR_ECB); | |
1905 | serial_port_out(port, UART_IER, 0); | |
1906 | serial_port_out(port, UART_LCR, 0); | |
1da177e4 | 1907 | serial_icr_write(up, UART_CSR, 0); /* Reset the UART */ |
4fd996a1 PG |
1908 | serial_port_out(port, UART_LCR, UART_LCR_CONF_MODE_B); |
1909 | serial_port_out(port, UART_EFR, UART_EFR_ECB); | |
1910 | serial_port_out(port, UART_LCR, 0); | |
1da177e4 LT |
1911 | } |
1912 | ||
1913 | #ifdef CONFIG_SERIAL_8250_RSA | |
1914 | /* | |
1915 | * If this is an RSA port, see if we can kick it up to the | |
1916 | * higher speed clock. | |
1917 | */ | |
1918 | enable_rsa(up); | |
1919 | #endif | |
1920 | ||
1921 | /* | |
1922 | * Clear the FIFO buffers and disable them. | |
7f927fcc | 1923 | * (they will be reenabled in set_termios()) |
1da177e4 LT |
1924 | */ |
1925 | serial8250_clear_fifos(up); | |
1926 | ||
1927 | /* | |
1928 | * Clear the interrupt registers. | |
1929 | */ | |
4fd996a1 PG |
1930 | serial_port_in(port, UART_LSR); |
1931 | serial_port_in(port, UART_RX); | |
1932 | serial_port_in(port, UART_IIR); | |
1933 | serial_port_in(port, UART_MSR); | |
1da177e4 LT |
1934 | |
1935 | /* | |
1936 | * At this point, there's no way the LSR could still be 0xff; | |
1937 | * if it is, then bail out, because there's likely no UART | |
1938 | * here. | |
1939 | */ | |
dfe42443 | 1940 | if (!(port->flags & UPF_BUGGY_UART) && |
4fd996a1 | 1941 | (serial_port_in(port, UART_LSR) == 0xff)) { |
7808a4c4 | 1942 | printk_ratelimited(KERN_INFO "ttyS%d: LSR safety check engaged!\n", |
dfe42443 | 1943 | serial_index(port)); |
1da177e4 LT |
1944 | return -ENODEV; |
1945 | } | |
1946 | ||
1947 | /* | |
1948 | * For a XR16C850, we need to set the trigger levels | |
1949 | */ | |
dfe42443 | 1950 | if (port->type == PORT_16850) { |
1da177e4 LT |
1951 | unsigned char fctr; |
1952 | ||
0acf519f | 1953 | serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); |
1da177e4 | 1954 | |
0acf519f | 1955 | fctr = serial_in(up, UART_FCTR) & ~(UART_FCTR_RX|UART_FCTR_TX); |
4fd996a1 PG |
1956 | serial_port_out(port, UART_FCTR, |
1957 | fctr | UART_FCTR_TRGD | UART_FCTR_RX); | |
1958 | serial_port_out(port, UART_TRG, UART_TRG_96); | |
1959 | serial_port_out(port, UART_FCTR, | |
1960 | fctr | UART_FCTR_TRGD | UART_FCTR_TX); | |
1961 | serial_port_out(port, UART_TRG, UART_TRG_96); | |
1da177e4 | 1962 | |
4fd996a1 | 1963 | serial_port_out(port, UART_LCR, 0); |
1da177e4 LT |
1964 | } |
1965 | ||
dfe42443 | 1966 | if (port->irq) { |
01c194d9 | 1967 | unsigned char iir1; |
40b36daa AW |
1968 | /* |
1969 | * Test for UARTs that do not reassert THRE when the | |
1970 | * transmitter is idle and the interrupt has already | |
1971 | * been cleared. Real 16550s should always reassert | |
1972 | * this interrupt whenever the transmitter is idle and | |
1973 | * the interrupt is enabled. Delays are necessary to | |
1974 | * allow register changes to become visible. | |
1975 | */ | |
dfe42443 | 1976 | spin_lock_irqsave(&port->lock, flags); |
1c2f0493 | 1977 | if (up->port.irqflags & IRQF_SHARED) |
dfe42443 | 1978 | disable_irq_nosync(port->irq); |
40b36daa AW |
1979 | |
1980 | wait_for_xmitr(up, UART_LSR_THRE); | |
55e4016d | 1981 | serial_port_out_sync(port, UART_IER, UART_IER_THRI); |
40b36daa | 1982 | udelay(1); /* allow THRE to set */ |
4fd996a1 PG |
1983 | iir1 = serial_port_in(port, UART_IIR); |
1984 | serial_port_out(port, UART_IER, 0); | |
55e4016d | 1985 | serial_port_out_sync(port, UART_IER, UART_IER_THRI); |
40b36daa | 1986 | udelay(1); /* allow a working UART time to re-assert THRE */ |
4fd996a1 PG |
1987 | iir = serial_port_in(port, UART_IIR); |
1988 | serial_port_out(port, UART_IER, 0); | |
40b36daa | 1989 | |
dfe42443 PG |
1990 | if (port->irqflags & IRQF_SHARED) |
1991 | enable_irq(port->irq); | |
1992 | spin_unlock_irqrestore(&port->lock, flags); | |
40b36daa AW |
1993 | |
1994 | /* | |
bc02d15a DW |
1995 | * If the interrupt is not reasserted, or we otherwise |
1996 | * don't trust the iir, setup a timer to kick the UART | |
1997 | * on a regular basis. | |
40b36daa | 1998 | */ |
bc02d15a DW |
1999 | if ((!(iir1 & UART_IIR_NO_INT) && (iir & UART_IIR_NO_INT)) || |
2000 | up->port.flags & UPF_BUG_THRE) { | |
363f66fe | 2001 | up->bugs |= UART_BUG_THRE; |
8440838b DM |
2002 | pr_debug("ttyS%d - using backup timer\n", |
2003 | serial_index(port)); | |
40b36daa AW |
2004 | } |
2005 | } | |
2006 | ||
363f66fe WN |
2007 | /* |
2008 | * The above check will only give an accurate result the first time | |
2009 | * the port is opened so this value needs to be preserved. | |
2010 | */ | |
2011 | if (up->bugs & UART_BUG_THRE) { | |
2012 | up->timer.function = serial8250_backup_timeout; | |
2013 | up->timer.data = (unsigned long)up; | |
2014 | mod_timer(&up->timer, jiffies + | |
54381067 | 2015 | uart_poll_timeout(port) + HZ / 5); |
363f66fe WN |
2016 | } |
2017 | ||
1da177e4 LT |
2018 | /* |
2019 | * If the "interrupt" for this port doesn't correspond with any | |
2020 | * hardware interrupt, we use a timer-based system. The original | |
2021 | * driver used to do this with IRQ0. | |
2022 | */ | |
dfe42443 | 2023 | if (!port->irq) { |
1da177e4 | 2024 | up->timer.data = (unsigned long)up; |
54381067 | 2025 | mod_timer(&up->timer, jiffies + uart_poll_timeout(port)); |
1da177e4 LT |
2026 | } else { |
2027 | retval = serial_link_irq_chain(up); | |
2028 | if (retval) | |
2029 | return retval; | |
2030 | } | |
2031 | ||
2032 | /* | |
2033 | * Now, initialize the UART | |
2034 | */ | |
4fd996a1 | 2035 | serial_port_out(port, UART_LCR, UART_LCR_WLEN8); |
1da177e4 | 2036 | |
dfe42443 | 2037 | spin_lock_irqsave(&port->lock, flags); |
1da177e4 | 2038 | if (up->port.flags & UPF_FOURPORT) { |
d4e33fac | 2039 | if (!up->port.irq) |
1da177e4 LT |
2040 | up->port.mctrl |= TIOCM_OUT1; |
2041 | } else | |
2042 | /* | |
2043 | * Most PC uarts need OUT2 raised to enable interrupts. | |
2044 | */ | |
dfe42443 | 2045 | if (port->irq) |
1da177e4 LT |
2046 | up->port.mctrl |= TIOCM_OUT2; |
2047 | ||
dfe42443 | 2048 | serial8250_set_mctrl(port, port->mctrl); |
55d3b282 | 2049 | |
b6adea33 MCC |
2050 | /* Serial over Lan (SoL) hack: |
2051 | Intel 8257x Gigabit ethernet chips have a | |
2052 | 16550 emulation, to be used for Serial Over Lan. | |
2053 | Those chips take a longer time than a normal | |
2054 | serial device to signalize that a transmission | |
2055 | data was queued. Due to that, the above test generally | |
2056 | fails. One solution would be to delay the reading of | |
2057 | iir. However, this is not reliable, since the timeout | |
2058 | is variable. So, let's just don't test if we receive | |
2059 | TX irq. This way, we'll never enable UART_BUG_TXEN. | |
2060 | */ | |
d41a4b51 | 2061 | if (skip_txen_test || up->port.flags & UPF_NO_TXEN_TEST) |
b6adea33 MCC |
2062 | goto dont_test_tx_en; |
2063 | ||
55d3b282 RK |
2064 | /* |
2065 | * Do a quick test to see if we receive an | |
2066 | * interrupt when we enable the TX irq. | |
2067 | */ | |
4fd996a1 PG |
2068 | serial_port_out(port, UART_IER, UART_IER_THRI); |
2069 | lsr = serial_port_in(port, UART_LSR); | |
2070 | iir = serial_port_in(port, UART_IIR); | |
2071 | serial_port_out(port, UART_IER, 0); | |
55d3b282 RK |
2072 | |
2073 | if (lsr & UART_LSR_TEMT && iir & UART_IIR_NO_INT) { | |
67f7654e RK |
2074 | if (!(up->bugs & UART_BUG_TXEN)) { |
2075 | up->bugs |= UART_BUG_TXEN; | |
55d3b282 | 2076 | pr_debug("ttyS%d - enabling bad tx status workarounds\n", |
8440838b | 2077 | serial_index(port)); |
55d3b282 RK |
2078 | } |
2079 | } else { | |
67f7654e | 2080 | up->bugs &= ~UART_BUG_TXEN; |
55d3b282 RK |
2081 | } |
2082 | ||
b6adea33 | 2083 | dont_test_tx_en: |
dfe42443 | 2084 | spin_unlock_irqrestore(&port->lock, flags); |
1da177e4 | 2085 | |
ad4c2aa6 CM |
2086 | /* |
2087 | * Clear the interrupt registers again for luck, and clear the | |
2088 | * saved flags to avoid getting false values from polling | |
2089 | * routines or the previous session. | |
2090 | */ | |
4fd996a1 PG |
2091 | serial_port_in(port, UART_LSR); |
2092 | serial_port_in(port, UART_RX); | |
2093 | serial_port_in(port, UART_IIR); | |
2094 | serial_port_in(port, UART_MSR); | |
ad4c2aa6 CM |
2095 | up->lsr_saved_flags = 0; |
2096 | up->msr_saved_flags = 0; | |
2097 | ||
1da177e4 LT |
2098 | /* |
2099 | * Finally, enable interrupts. Note: Modem status interrupts | |
2100 | * are set via set_termios(), which will be occurring imminently | |
2101 | * anyway, so we don't enable them here. | |
2102 | */ | |
2103 | up->ier = UART_IER_RLSI | UART_IER_RDI; | |
4fd996a1 | 2104 | serial_port_out(port, UART_IER, up->ier); |
1da177e4 | 2105 | |
dfe42443 | 2106 | if (port->flags & UPF_FOURPORT) { |
1da177e4 LT |
2107 | unsigned int icp; |
2108 | /* | |
2109 | * Enable interrupts on the AST Fourport board | |
2110 | */ | |
dfe42443 | 2111 | icp = (port->iobase & 0xfe0) | 0x01f; |
1da177e4 | 2112 | outb_p(0x80, icp); |
0d263a26 | 2113 | inb_p(icp); |
1da177e4 LT |
2114 | } |
2115 | ||
1da177e4 LT |
2116 | return 0; |
2117 | } | |
2118 | ||
2119 | static void serial8250_shutdown(struct uart_port *port) | |
2120 | { | |
49d5741b JI |
2121 | struct uart_8250_port *up = |
2122 | container_of(port, struct uart_8250_port, port); | |
1da177e4 LT |
2123 | unsigned long flags; |
2124 | ||
2125 | /* | |
2126 | * Disable interrupts from this port | |
2127 | */ | |
2128 | up->ier = 0; | |
4fd996a1 | 2129 | serial_port_out(port, UART_IER, 0); |
1da177e4 | 2130 | |
dfe42443 PG |
2131 | spin_lock_irqsave(&port->lock, flags); |
2132 | if (port->flags & UPF_FOURPORT) { | |
1da177e4 | 2133 | /* reset interrupts on the AST Fourport board */ |
dfe42443 PG |
2134 | inb((port->iobase & 0xfe0) | 0x1f); |
2135 | port->mctrl |= TIOCM_OUT1; | |
1da177e4 | 2136 | } else |
dfe42443 | 2137 | port->mctrl &= ~TIOCM_OUT2; |
1da177e4 | 2138 | |
dfe42443 PG |
2139 | serial8250_set_mctrl(port, port->mctrl); |
2140 | spin_unlock_irqrestore(&port->lock, flags); | |
1da177e4 LT |
2141 | |
2142 | /* | |
2143 | * Disable break condition and FIFOs | |
2144 | */ | |
4fd996a1 PG |
2145 | serial_port_out(port, UART_LCR, |
2146 | serial_port_in(port, UART_LCR) & ~UART_LCR_SBC); | |
1da177e4 LT |
2147 | serial8250_clear_fifos(up); |
2148 | ||
2149 | #ifdef CONFIG_SERIAL_8250_RSA | |
2150 | /* | |
2151 | * Reset the RSA board back to 115kbps compat mode. | |
2152 | */ | |
2153 | disable_rsa(up); | |
2154 | #endif | |
2155 | ||
2156 | /* | |
2157 | * Read data port to reset things, and then unlink from | |
2158 | * the IRQ chain. | |
2159 | */ | |
4fd996a1 | 2160 | serial_port_in(port, UART_RX); |
1da177e4 | 2161 | |
40b36daa AW |
2162 | del_timer_sync(&up->timer); |
2163 | up->timer.function = serial8250_timeout; | |
dfe42443 | 2164 | if (port->irq) |
1da177e4 LT |
2165 | serial_unlink_irq_chain(up); |
2166 | } | |
2167 | ||
2168 | static unsigned int serial8250_get_divisor(struct uart_port *port, unsigned int baud) | |
2169 | { | |
2170 | unsigned int quot; | |
2171 | ||
2172 | /* | |
2173 | * Handle magic divisors for baud rates above baud_base on | |
2174 | * SMSC SuperIO chips. | |
2175 | */ | |
2176 | if ((port->flags & UPF_MAGIC_MULTIPLIER) && | |
2177 | baud == (port->uartclk/4)) | |
2178 | quot = 0x8001; | |
2179 | else if ((port->flags & UPF_MAGIC_MULTIPLIER) && | |
2180 | baud == (port->uartclk/8)) | |
2181 | quot = 0x8002; | |
2182 | else | |
2183 | quot = uart_get_divisor(port, baud); | |
2184 | ||
2185 | return quot; | |
2186 | } | |
2187 | ||
235dae5d PL |
2188 | void |
2189 | serial8250_do_set_termios(struct uart_port *port, struct ktermios *termios, | |
2190 | struct ktermios *old) | |
1da177e4 | 2191 | { |
49d5741b JI |
2192 | struct uart_8250_port *up = |
2193 | container_of(port, struct uart_8250_port, port); | |
1da177e4 LT |
2194 | unsigned char cval, fcr = 0; |
2195 | unsigned long flags; | |
2196 | unsigned int baud, quot; | |
2197 | ||
2198 | switch (termios->c_cflag & CSIZE) { | |
2199 | case CS5: | |
0a8b80c5 | 2200 | cval = UART_LCR_WLEN5; |
1da177e4 LT |
2201 | break; |
2202 | case CS6: | |
0a8b80c5 | 2203 | cval = UART_LCR_WLEN6; |
1da177e4 LT |
2204 | break; |
2205 | case CS7: | |
0a8b80c5 | 2206 | cval = UART_LCR_WLEN7; |
1da177e4 LT |
2207 | break; |
2208 | default: | |
2209 | case CS8: | |
0a8b80c5 | 2210 | cval = UART_LCR_WLEN8; |
1da177e4 LT |
2211 | break; |
2212 | } | |
2213 | ||
2214 | if (termios->c_cflag & CSTOPB) | |
0a8b80c5 | 2215 | cval |= UART_LCR_STOP; |
1da177e4 LT |
2216 | if (termios->c_cflag & PARENB) |
2217 | cval |= UART_LCR_PARITY; | |
2218 | if (!(termios->c_cflag & PARODD)) | |
2219 | cval |= UART_LCR_EPAR; | |
2220 | #ifdef CMSPAR | |
2221 | if (termios->c_cflag & CMSPAR) | |
2222 | cval |= UART_LCR_SPAR; | |
2223 | #endif | |
2224 | ||
2225 | /* | |
2226 | * Ask the core to calculate the divisor for us. | |
2227 | */ | |
24d481ec AV |
2228 | baud = uart_get_baud_rate(port, termios, old, |
2229 | port->uartclk / 16 / 0xffff, | |
2230 | port->uartclk / 16); | |
1da177e4 LT |
2231 | quot = serial8250_get_divisor(port, baud); |
2232 | ||
2233 | /* | |
4ba5e35d | 2234 | * Oxford Semi 952 rev B workaround |
1da177e4 | 2235 | */ |
4ba5e35d | 2236 | if (up->bugs & UART_BUG_QUOT && (quot & 0xff) == 0) |
3e8d4e20 | 2237 | quot++; |
1da177e4 | 2238 | |
dfe42443 | 2239 | if (up->capabilities & UART_CAP_FIFO && port->fifosize > 1) { |
f9a9111b CM |
2240 | fcr = uart_config[port->type].fcr; |
2241 | if (baud < 2400) { | |
2242 | fcr &= ~UART_FCR_TRIGGER_MASK; | |
2243 | fcr |= UART_FCR_TRIGGER_1; | |
2244 | } | |
1da177e4 LT |
2245 | } |
2246 | ||
2247 | /* | |
2248 | * MCR-based auto flow control. When AFE is enabled, RTS will be | |
2249 | * deasserted when the receive FIFO contains more characters than | |
2250 | * the trigger, or the MCR RTS bit is cleared. In the case where | |
2251 | * the remote UART is not using CTS auto flow control, we must | |
2252 | * have sufficient FIFO entries for the latency of the remote | |
2253 | * UART to respond. IOW, at least 32 bytes of FIFO. | |
2254 | */ | |
dfe42443 | 2255 | if (up->capabilities & UART_CAP_AFE && port->fifosize >= 32) { |
1da177e4 LT |
2256 | up->mcr &= ~UART_MCR_AFE; |
2257 | if (termios->c_cflag & CRTSCTS) | |
2258 | up->mcr |= UART_MCR_AFE; | |
2259 | } | |
2260 | ||
2261 | /* | |
2262 | * Ok, we're now changing the port state. Do it with | |
2263 | * interrupts disabled. | |
2264 | */ | |
dfe42443 | 2265 | spin_lock_irqsave(&port->lock, flags); |
1da177e4 LT |
2266 | |
2267 | /* | |
2268 | * Update the per-port timeout. | |
2269 | */ | |
2270 | uart_update_timeout(port, termios->c_cflag, baud); | |
2271 | ||
dfe42443 | 2272 | port->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR; |
1da177e4 | 2273 | if (termios->c_iflag & INPCK) |
dfe42443 | 2274 | port->read_status_mask |= UART_LSR_FE | UART_LSR_PE; |
1da177e4 | 2275 | if (termios->c_iflag & (BRKINT | PARMRK)) |
dfe42443 | 2276 | port->read_status_mask |= UART_LSR_BI; |
1da177e4 LT |
2277 | |
2278 | /* | |
2279 | * Characteres to ignore | |
2280 | */ | |
dfe42443 | 2281 | port->ignore_status_mask = 0; |
1da177e4 | 2282 | if (termios->c_iflag & IGNPAR) |
dfe42443 | 2283 | port->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE; |
1da177e4 | 2284 | if (termios->c_iflag & IGNBRK) { |
dfe42443 | 2285 | port->ignore_status_mask |= UART_LSR_BI; |
1da177e4 LT |
2286 | /* |
2287 | * If we're ignoring parity and break indicators, | |
2288 | * ignore overruns too (for real raw support). | |
2289 | */ | |
2290 | if (termios->c_iflag & IGNPAR) | |
dfe42443 | 2291 | port->ignore_status_mask |= UART_LSR_OE; |
1da177e4 LT |
2292 | } |
2293 | ||
2294 | /* | |
2295 | * ignore all characters if CREAD is not set | |
2296 | */ | |
2297 | if ((termios->c_cflag & CREAD) == 0) | |
dfe42443 | 2298 | port->ignore_status_mask |= UART_LSR_DR; |
1da177e4 LT |
2299 | |
2300 | /* | |
2301 | * CTS flow control flag and modem status interrupts | |
2302 | */ | |
f8b372a1 | 2303 | up->ier &= ~UART_IER_MSI; |
21c614a7 PA |
2304 | if (!(up->bugs & UART_BUG_NOMSR) && |
2305 | UART_ENABLE_MS(&up->port, termios->c_cflag)) | |
1da177e4 LT |
2306 | up->ier |= UART_IER_MSI; |
2307 | if (up->capabilities & UART_CAP_UUE) | |
4539c24f SW |
2308 | up->ier |= UART_IER_UUE; |
2309 | if (up->capabilities & UART_CAP_RTOIE) | |
2310 | up->ier |= UART_IER_RTOIE; | |
1da177e4 | 2311 | |
4fd996a1 | 2312 | serial_port_out(port, UART_IER, up->ier); |
1da177e4 LT |
2313 | |
2314 | if (up->capabilities & UART_CAP_EFR) { | |
2315 | unsigned char efr = 0; | |
2316 | /* | |
2317 | * TI16C752/Startech hardware flow control. FIXME: | |
2318 | * - TI16C752 requires control thresholds to be set. | |
2319 | * - UART_MCR_RTS is ineffective if auto-RTS mode is enabled. | |
2320 | */ | |
2321 | if (termios->c_cflag & CRTSCTS) | |
2322 | efr |= UART_EFR_CTS; | |
2323 | ||
4fd996a1 | 2324 | serial_port_out(port, UART_LCR, UART_LCR_CONF_MODE_B); |
dfe42443 | 2325 | if (port->flags & UPF_EXAR_EFR) |
4fd996a1 | 2326 | serial_port_out(port, UART_XR_EFR, efr); |
06315348 | 2327 | else |
4fd996a1 | 2328 | serial_port_out(port, UART_EFR, efr); |
1da177e4 LT |
2329 | } |
2330 | ||
f2eda27d | 2331 | #ifdef CONFIG_ARCH_OMAP |
255341c6 | 2332 | /* Workaround to enable 115200 baud on OMAP1510 internal ports */ |
5668545a | 2333 | if (cpu_is_omap1510() && is_omap_port(up)) { |
255341c6 JM |
2334 | if (baud == 115200) { |
2335 | quot = 1; | |
4fd996a1 | 2336 | serial_port_out(port, UART_OMAP_OSC_12M_SEL, 1); |
255341c6 | 2337 | } else |
4fd996a1 | 2338 | serial_port_out(port, UART_OMAP_OSC_12M_SEL, 0); |
255341c6 JM |
2339 | } |
2340 | #endif | |
2341 | ||
4fd996a1 PG |
2342 | /* |
2343 | * For NatSemi, switch to bank 2 not bank 1, to avoid resetting EXCR2, | |
2344 | * otherwise just set DLAB | |
2345 | */ | |
2346 | if (up->capabilities & UART_NATSEMI) | |
2347 | serial_port_out(port, UART_LCR, 0xe0); | |
2348 | else | |
2349 | serial_port_out(port, UART_LCR, cval | UART_LCR_DLAB); | |
1da177e4 | 2350 | |
b32b19b8 | 2351 | serial_dl_write(up, quot); |
1da177e4 LT |
2352 | |
2353 | /* | |
2354 | * LCR DLAB must be set to enable 64-byte FIFO mode. If the FCR | |
2355 | * is written without DLAB set, this mode will be disabled. | |
2356 | */ | |
dfe42443 | 2357 | if (port->type == PORT_16750) |
4fd996a1 | 2358 | serial_port_out(port, UART_FCR, fcr); |
1da177e4 | 2359 | |
4fd996a1 | 2360 | serial_port_out(port, UART_LCR, cval); /* reset DLAB */ |
1da177e4 | 2361 | up->lcr = cval; /* Save LCR */ |
dfe42443 | 2362 | if (port->type != PORT_16750) { |
4fd996a1 PG |
2363 | /* emulated UARTs (Lucent Venus 167x) need two steps */ |
2364 | if (fcr & UART_FCR_ENABLE_FIFO) | |
2365 | serial_port_out(port, UART_FCR, UART_FCR_ENABLE_FIFO); | |
2366 | serial_port_out(port, UART_FCR, fcr); /* set fcr */ | |
1da177e4 | 2367 | } |
dfe42443 PG |
2368 | serial8250_set_mctrl(port, port->mctrl); |
2369 | spin_unlock_irqrestore(&port->lock, flags); | |
e991a2bd AC |
2370 | /* Don't rewrite B0 */ |
2371 | if (tty_termios_baud_rate(termios)) | |
2372 | tty_termios_encode_baud_rate(termios, baud, baud); | |
1da177e4 | 2373 | } |
235dae5d PL |
2374 | EXPORT_SYMBOL(serial8250_do_set_termios); |
2375 | ||
2376 | static void | |
2377 | serial8250_set_termios(struct uart_port *port, struct ktermios *termios, | |
2378 | struct ktermios *old) | |
2379 | { | |
2380 | if (port->set_termios) | |
2381 | port->set_termios(port, termios, old); | |
2382 | else | |
2383 | serial8250_do_set_termios(port, termios, old); | |
2384 | } | |
1da177e4 | 2385 | |
dc77f161 | 2386 | static void |
a0821df6 | 2387 | serial8250_set_ldisc(struct uart_port *port, int new) |
dc77f161 | 2388 | { |
a0821df6 | 2389 | if (new == N_PPS) { |
dc77f161 RG |
2390 | port->flags |= UPF_HARDPPS_CD; |
2391 | serial8250_enable_ms(port); | |
2392 | } else | |
2393 | port->flags &= ~UPF_HARDPPS_CD; | |
2394 | } | |
2395 | ||
c161afe9 ML |
2396 | |
2397 | void serial8250_do_pm(struct uart_port *port, unsigned int state, | |
2398 | unsigned int oldstate) | |
1da177e4 | 2399 | { |
49d5741b JI |
2400 | struct uart_8250_port *p = |
2401 | container_of(port, struct uart_8250_port, port); | |
1da177e4 LT |
2402 | |
2403 | serial8250_set_sleep(p, state != 0); | |
c161afe9 ML |
2404 | } |
2405 | EXPORT_SYMBOL(serial8250_do_pm); | |
1da177e4 | 2406 | |
c161afe9 ML |
2407 | static void |
2408 | serial8250_pm(struct uart_port *port, unsigned int state, | |
2409 | unsigned int oldstate) | |
2410 | { | |
2411 | if (port->pm) | |
2412 | port->pm(port, state, oldstate); | |
2413 | else | |
2414 | serial8250_do_pm(port, state, oldstate); | |
1da177e4 LT |
2415 | } |
2416 | ||
f2eda27d RK |
2417 | static unsigned int serial8250_port_size(struct uart_8250_port *pt) |
2418 | { | |
2419 | if (pt->port.iotype == UPIO_AU) | |
b2b13cdf | 2420 | return 0x1000; |
f2eda27d RK |
2421 | #ifdef CONFIG_ARCH_OMAP |
2422 | if (is_omap_port(pt)) | |
2423 | return 0x16 << pt->port.regshift; | |
2424 | #endif | |
2425 | return 8 << pt->port.regshift; | |
2426 | } | |
2427 | ||
1da177e4 LT |
2428 | /* |
2429 | * Resource handling. | |
2430 | */ | |
2431 | static int serial8250_request_std_resource(struct uart_8250_port *up) | |
2432 | { | |
f2eda27d | 2433 | unsigned int size = serial8250_port_size(up); |
dfe42443 | 2434 | struct uart_port *port = &up->port; |
1da177e4 LT |
2435 | int ret = 0; |
2436 | ||
dfe42443 | 2437 | switch (port->iotype) { |
85835f44 | 2438 | case UPIO_AU: |
0b30d668 SS |
2439 | case UPIO_TSI: |
2440 | case UPIO_MEM32: | |
1da177e4 | 2441 | case UPIO_MEM: |
dfe42443 | 2442 | if (!port->mapbase) |
1da177e4 LT |
2443 | break; |
2444 | ||
dfe42443 | 2445 | if (!request_mem_region(port->mapbase, size, "serial")) { |
1da177e4 LT |
2446 | ret = -EBUSY; |
2447 | break; | |
2448 | } | |
2449 | ||
dfe42443 PG |
2450 | if (port->flags & UPF_IOREMAP) { |
2451 | port->membase = ioremap_nocache(port->mapbase, size); | |
2452 | if (!port->membase) { | |
2453 | release_mem_region(port->mapbase, size); | |
1da177e4 LT |
2454 | ret = -ENOMEM; |
2455 | } | |
2456 | } | |
2457 | break; | |
2458 | ||
2459 | case UPIO_HUB6: | |
2460 | case UPIO_PORT: | |
dfe42443 | 2461 | if (!request_region(port->iobase, size, "serial")) |
1da177e4 LT |
2462 | ret = -EBUSY; |
2463 | break; | |
2464 | } | |
2465 | return ret; | |
2466 | } | |
2467 | ||
2468 | static void serial8250_release_std_resource(struct uart_8250_port *up) | |
2469 | { | |
f2eda27d | 2470 | unsigned int size = serial8250_port_size(up); |
dfe42443 | 2471 | struct uart_port *port = &up->port; |
1da177e4 | 2472 | |
dfe42443 | 2473 | switch (port->iotype) { |
85835f44 | 2474 | case UPIO_AU: |
0b30d668 SS |
2475 | case UPIO_TSI: |
2476 | case UPIO_MEM32: | |
1da177e4 | 2477 | case UPIO_MEM: |
dfe42443 | 2478 | if (!port->mapbase) |
1da177e4 LT |
2479 | break; |
2480 | ||
dfe42443 PG |
2481 | if (port->flags & UPF_IOREMAP) { |
2482 | iounmap(port->membase); | |
2483 | port->membase = NULL; | |
1da177e4 LT |
2484 | } |
2485 | ||
dfe42443 | 2486 | release_mem_region(port->mapbase, size); |
1da177e4 LT |
2487 | break; |
2488 | ||
2489 | case UPIO_HUB6: | |
2490 | case UPIO_PORT: | |
dfe42443 | 2491 | release_region(port->iobase, size); |
1da177e4 LT |
2492 | break; |
2493 | } | |
2494 | } | |
2495 | ||
2496 | static int serial8250_request_rsa_resource(struct uart_8250_port *up) | |
2497 | { | |
2498 | unsigned long start = UART_RSA_BASE << up->port.regshift; | |
2499 | unsigned int size = 8 << up->port.regshift; | |
dfe42443 | 2500 | struct uart_port *port = &up->port; |
0b30d668 | 2501 | int ret = -EINVAL; |
1da177e4 | 2502 | |
dfe42443 | 2503 | switch (port->iotype) { |
1da177e4 LT |
2504 | case UPIO_HUB6: |
2505 | case UPIO_PORT: | |
dfe42443 | 2506 | start += port->iobase; |
0b30d668 SS |
2507 | if (request_region(start, size, "serial-rsa")) |
2508 | ret = 0; | |
2509 | else | |
1da177e4 LT |
2510 | ret = -EBUSY; |
2511 | break; | |
2512 | } | |
2513 | ||
2514 | return ret; | |
2515 | } | |
2516 | ||
2517 | static void serial8250_release_rsa_resource(struct uart_8250_port *up) | |
2518 | { | |
2519 | unsigned long offset = UART_RSA_BASE << up->port.regshift; | |
2520 | unsigned int size = 8 << up->port.regshift; | |
dfe42443 | 2521 | struct uart_port *port = &up->port; |
1da177e4 | 2522 | |
dfe42443 | 2523 | switch (port->iotype) { |
1da177e4 LT |
2524 | case UPIO_HUB6: |
2525 | case UPIO_PORT: | |
dfe42443 | 2526 | release_region(port->iobase + offset, size); |
1da177e4 LT |
2527 | break; |
2528 | } | |
2529 | } | |
2530 | ||
2531 | static void serial8250_release_port(struct uart_port *port) | |
2532 | { | |
49d5741b JI |
2533 | struct uart_8250_port *up = |
2534 | container_of(port, struct uart_8250_port, port); | |
1da177e4 LT |
2535 | |
2536 | serial8250_release_std_resource(up); | |
dfe42443 | 2537 | if (port->type == PORT_RSA) |
1da177e4 LT |
2538 | serial8250_release_rsa_resource(up); |
2539 | } | |
2540 | ||
2541 | static int serial8250_request_port(struct uart_port *port) | |
2542 | { | |
49d5741b JI |
2543 | struct uart_8250_port *up = |
2544 | container_of(port, struct uart_8250_port, port); | |
1da177e4 LT |
2545 | int ret = 0; |
2546 | ||
2547 | ret = serial8250_request_std_resource(up); | |
dfe42443 | 2548 | if (ret == 0 && port->type == PORT_RSA) { |
1da177e4 LT |
2549 | ret = serial8250_request_rsa_resource(up); |
2550 | if (ret < 0) | |
2551 | serial8250_release_std_resource(up); | |
2552 | } | |
2553 | ||
2554 | return ret; | |
2555 | } | |
2556 | ||
2557 | static void serial8250_config_port(struct uart_port *port, int flags) | |
2558 | { | |
49d5741b JI |
2559 | struct uart_8250_port *up = |
2560 | container_of(port, struct uart_8250_port, port); | |
1da177e4 LT |
2561 | int probeflags = PROBE_ANY; |
2562 | int ret; | |
2563 | ||
1da177e4 LT |
2564 | /* |
2565 | * Find the region that we can probe for. This in turn | |
2566 | * tells us whether we can probe for the type of port. | |
2567 | */ | |
2568 | ret = serial8250_request_std_resource(up); | |
2569 | if (ret < 0) | |
2570 | return; | |
2571 | ||
2572 | ret = serial8250_request_rsa_resource(up); | |
2573 | if (ret < 0) | |
2574 | probeflags &= ~PROBE_RSA; | |
2575 | ||
dfe42443 | 2576 | if (port->iotype != up->cur_iotype) |
b8e7e40a AC |
2577 | set_io_from_upio(port); |
2578 | ||
1da177e4 LT |
2579 | if (flags & UART_CONFIG_TYPE) |
2580 | autoconfig(up, probeflags); | |
b2b13cdf | 2581 | |
b2b13cdf | 2582 | /* if access method is AU, it is a 16550 with a quirk */ |
dfe42443 | 2583 | if (port->type == PORT_16550A && port->iotype == UPIO_AU) |
b2b13cdf | 2584 | up->bugs |= UART_BUG_NOMSR; |
b2b13cdf | 2585 | |
dfe42443 | 2586 | if (port->type != PORT_UNKNOWN && flags & UART_CONFIG_IRQ) |
1da177e4 LT |
2587 | autoconfig_irq(up); |
2588 | ||
dfe42443 | 2589 | if (port->type != PORT_RSA && probeflags & PROBE_RSA) |
1da177e4 | 2590 | serial8250_release_rsa_resource(up); |
dfe42443 | 2591 | if (port->type == PORT_UNKNOWN) |
1da177e4 LT |
2592 | serial8250_release_std_resource(up); |
2593 | } | |
2594 | ||
2595 | static int | |
2596 | serial8250_verify_port(struct uart_port *port, struct serial_struct *ser) | |
2597 | { | |
a62c4133 | 2598 | if (ser->irq >= nr_irqs || ser->irq < 0 || |
1da177e4 LT |
2599 | ser->baud_base < 9600 || ser->type < PORT_UNKNOWN || |
2600 | ser->type >= ARRAY_SIZE(uart_config) || ser->type == PORT_CIRRUS || | |
2601 | ser->type == PORT_STARTECH) | |
2602 | return -EINVAL; | |
2603 | return 0; | |
2604 | } | |
2605 | ||
2606 | static const char * | |
2607 | serial8250_type(struct uart_port *port) | |
2608 | { | |
2609 | int type = port->type; | |
2610 | ||
2611 | if (type >= ARRAY_SIZE(uart_config)) | |
2612 | type = 0; | |
2613 | return uart_config[type].name; | |
2614 | } | |
2615 | ||
2616 | static struct uart_ops serial8250_pops = { | |
2617 | .tx_empty = serial8250_tx_empty, | |
2618 | .set_mctrl = serial8250_set_mctrl, | |
2619 | .get_mctrl = serial8250_get_mctrl, | |
2620 | .stop_tx = serial8250_stop_tx, | |
2621 | .start_tx = serial8250_start_tx, | |
2622 | .stop_rx = serial8250_stop_rx, | |
2623 | .enable_ms = serial8250_enable_ms, | |
2624 | .break_ctl = serial8250_break_ctl, | |
2625 | .startup = serial8250_startup, | |
2626 | .shutdown = serial8250_shutdown, | |
2627 | .set_termios = serial8250_set_termios, | |
dc77f161 | 2628 | .set_ldisc = serial8250_set_ldisc, |
1da177e4 LT |
2629 | .pm = serial8250_pm, |
2630 | .type = serial8250_type, | |
2631 | .release_port = serial8250_release_port, | |
2632 | .request_port = serial8250_request_port, | |
2633 | .config_port = serial8250_config_port, | |
2634 | .verify_port = serial8250_verify_port, | |
f2d937f3 JW |
2635 | #ifdef CONFIG_CONSOLE_POLL |
2636 | .poll_get_char = serial8250_get_poll_char, | |
2637 | .poll_put_char = serial8250_put_poll_char, | |
2638 | #endif | |
1da177e4 LT |
2639 | }; |
2640 | ||
2641 | static struct uart_8250_port serial8250_ports[UART_NR]; | |
2642 | ||
af7f3743 AC |
2643 | static void (*serial8250_isa_config)(int port, struct uart_port *up, |
2644 | unsigned short *capabilities); | |
2645 | ||
2646 | void serial8250_set_isa_configurator( | |
2647 | void (*v)(int port, struct uart_port *up, unsigned short *capabilities)) | |
2648 | { | |
2649 | serial8250_isa_config = v; | |
2650 | } | |
2651 | EXPORT_SYMBOL(serial8250_set_isa_configurator); | |
2652 | ||
1da177e4 LT |
2653 | static void __init serial8250_isa_init_ports(void) |
2654 | { | |
2655 | struct uart_8250_port *up; | |
2656 | static int first = 1; | |
4c0ebb80 | 2657 | int i, irqflag = 0; |
1da177e4 LT |
2658 | |
2659 | if (!first) | |
2660 | return; | |
2661 | first = 0; | |
2662 | ||
a61c2d78 | 2663 | for (i = 0; i < nr_uarts; i++) { |
1da177e4 | 2664 | struct uart_8250_port *up = &serial8250_ports[i]; |
dfe42443 | 2665 | struct uart_port *port = &up->port; |
1da177e4 | 2666 | |
dfe42443 PG |
2667 | port->line = i; |
2668 | spin_lock_init(&port->lock); | |
1da177e4 LT |
2669 | |
2670 | init_timer(&up->timer); | |
2671 | up->timer.function = serial8250_timeout; | |
2672 | ||
2673 | /* | |
2674 | * ALPHA_KLUDGE_MCR needs to be killed. | |
2675 | */ | |
2676 | up->mcr_mask = ~ALPHA_KLUDGE_MCR; | |
2677 | up->mcr_force = ALPHA_KLUDGE_MCR; | |
2678 | ||
dfe42443 | 2679 | port->ops = &serial8250_pops; |
1da177e4 LT |
2680 | } |
2681 | ||
4c0ebb80 AGR |
2682 | if (share_irqs) |
2683 | irqflag = IRQF_SHARED; | |
2684 | ||
44454bcd | 2685 | for (i = 0, up = serial8250_ports; |
a61c2d78 | 2686 | i < ARRAY_SIZE(old_serial_port) && i < nr_uarts; |
1da177e4 | 2687 | i++, up++) { |
dfe42443 PG |
2688 | struct uart_port *port = &up->port; |
2689 | ||
2690 | port->iobase = old_serial_port[i].port; | |
2691 | port->irq = irq_canonicalize(old_serial_port[i].irq); | |
2692 | port->irqflags = old_serial_port[i].irqflags; | |
2693 | port->uartclk = old_serial_port[i].baud_base * 16; | |
2694 | port->flags = old_serial_port[i].flags; | |
2695 | port->hub6 = old_serial_port[i].hub6; | |
2696 | port->membase = old_serial_port[i].iomem_base; | |
2697 | port->iotype = old_serial_port[i].io_type; | |
2698 | port->regshift = old_serial_port[i].iomem_reg_shift; | |
2699 | set_io_from_upio(port); | |
2700 | port->irqflags |= irqflag; | |
af7f3743 AC |
2701 | if (serial8250_isa_config != NULL) |
2702 | serial8250_isa_config(i, &up->port, &up->capabilities); | |
2703 | ||
1da177e4 LT |
2704 | } |
2705 | } | |
2706 | ||
b5d228cc SL |
2707 | static void |
2708 | serial8250_init_fixed_type_port(struct uart_8250_port *up, unsigned int type) | |
2709 | { | |
2710 | up->port.type = type; | |
2711 | up->port.fifosize = uart_config[type].fifo_size; | |
2712 | up->capabilities = uart_config[type].flags; | |
2713 | up->tx_loadsz = uart_config[type].tx_loadsz; | |
2714 | } | |
2715 | ||
1da177e4 LT |
2716 | static void __init |
2717 | serial8250_register_ports(struct uart_driver *drv, struct device *dev) | |
2718 | { | |
2719 | int i; | |
2720 | ||
b8e7e40a AC |
2721 | for (i = 0; i < nr_uarts; i++) { |
2722 | struct uart_8250_port *up = &serial8250_ports[i]; | |
2723 | up->cur_iotype = 0xFF; | |
2724 | } | |
2725 | ||
1da177e4 LT |
2726 | serial8250_isa_init_ports(); |
2727 | ||
a61c2d78 | 2728 | for (i = 0; i < nr_uarts; i++) { |
1da177e4 LT |
2729 | struct uart_8250_port *up = &serial8250_ports[i]; |
2730 | ||
2731 | up->port.dev = dev; | |
b5d228cc SL |
2732 | |
2733 | if (up->port.flags & UPF_FIXED_TYPE) | |
2734 | serial8250_init_fixed_type_port(up, up->port.type); | |
2735 | ||
1da177e4 LT |
2736 | uart_add_one_port(drv, &up->port); |
2737 | } | |
2738 | } | |
2739 | ||
2740 | #ifdef CONFIG_SERIAL_8250_CONSOLE | |
2741 | ||
d358788f RK |
2742 | static void serial8250_console_putchar(struct uart_port *port, int ch) |
2743 | { | |
49d5741b JI |
2744 | struct uart_8250_port *up = |
2745 | container_of(port, struct uart_8250_port, port); | |
d358788f RK |
2746 | |
2747 | wait_for_xmitr(up, UART_LSR_THRE); | |
4fd996a1 | 2748 | serial_port_out(port, UART_TX, ch); |
d358788f RK |
2749 | } |
2750 | ||
1da177e4 LT |
2751 | /* |
2752 | * Print a string to the serial port trying not to disturb | |
2753 | * any possible real use of the port... | |
2754 | * | |
2755 | * The console_lock must be held when we get here. | |
2756 | */ | |
2757 | static void | |
2758 | serial8250_console_write(struct console *co, const char *s, unsigned int count) | |
2759 | { | |
2760 | struct uart_8250_port *up = &serial8250_ports[co->index]; | |
dfe42443 | 2761 | struct uart_port *port = &up->port; |
d8a5a8d7 | 2762 | unsigned long flags; |
1da177e4 | 2763 | unsigned int ier; |
d8a5a8d7 | 2764 | int locked = 1; |
1da177e4 | 2765 | |
78512ece AM |
2766 | touch_nmi_watchdog(); |
2767 | ||
68aa2c0d | 2768 | local_irq_save(flags); |
dfe42443 | 2769 | if (port->sysrq) { |
86b21199 | 2770 | /* serial8250_handle_irq() already took the lock */ |
68aa2c0d AM |
2771 | locked = 0; |
2772 | } else if (oops_in_progress) { | |
dfe42443 | 2773 | locked = spin_trylock(&port->lock); |
d8a5a8d7 | 2774 | } else |
dfe42443 | 2775 | spin_lock(&port->lock); |
d8a5a8d7 | 2776 | |
1da177e4 | 2777 | /* |
dc7bf130 | 2778 | * First save the IER then disable the interrupts |
1da177e4 | 2779 | */ |
4fd996a1 | 2780 | ier = serial_port_in(port, UART_IER); |
1da177e4 LT |
2781 | |
2782 | if (up->capabilities & UART_CAP_UUE) | |
4fd996a1 | 2783 | serial_port_out(port, UART_IER, UART_IER_UUE); |
1da177e4 | 2784 | else |
4fd996a1 | 2785 | serial_port_out(port, UART_IER, 0); |
1da177e4 | 2786 | |
dfe42443 | 2787 | uart_console_write(port, s, count, serial8250_console_putchar); |
1da177e4 LT |
2788 | |
2789 | /* | |
2790 | * Finally, wait for transmitter to become empty | |
2791 | * and restore the IER | |
2792 | */ | |
f91a3715 | 2793 | wait_for_xmitr(up, BOTH_EMPTY); |
4fd996a1 | 2794 | serial_port_out(port, UART_IER, ier); |
d8a5a8d7 | 2795 | |
ad4c2aa6 CM |
2796 | /* |
2797 | * The receive handling will happen properly because the | |
2798 | * receive ready bit will still be set; it is not cleared | |
2799 | * on read. However, modem control will not, we must | |
2800 | * call it if we have saved something in the saved flags | |
2801 | * while processing with interrupts off. | |
2802 | */ | |
2803 | if (up->msr_saved_flags) | |
3986fb2b | 2804 | serial8250_modem_status(up); |
ad4c2aa6 | 2805 | |
d8a5a8d7 | 2806 | if (locked) |
dfe42443 | 2807 | spin_unlock(&port->lock); |
68aa2c0d | 2808 | local_irq_restore(flags); |
1da177e4 LT |
2809 | } |
2810 | ||
118c0ace | 2811 | static int __init serial8250_console_setup(struct console *co, char *options) |
1da177e4 LT |
2812 | { |
2813 | struct uart_port *port; | |
2814 | int baud = 9600; | |
2815 | int bits = 8; | |
2816 | int parity = 'n'; | |
2817 | int flow = 'n'; | |
2818 | ||
2819 | /* | |
2820 | * Check whether an invalid uart number has been specified, and | |
2821 | * if so, search for the first available port that does have | |
2822 | * console support. | |
2823 | */ | |
a61c2d78 | 2824 | if (co->index >= nr_uarts) |
1da177e4 LT |
2825 | co->index = 0; |
2826 | port = &serial8250_ports[co->index].port; | |
2827 | if (!port->iobase && !port->membase) | |
2828 | return -ENODEV; | |
2829 | ||
2830 | if (options) | |
2831 | uart_parse_options(options, &baud, &parity, &bits, &flow); | |
2832 | ||
2833 | return uart_set_options(port, co, baud, parity, bits, flow); | |
2834 | } | |
2835 | ||
b6b1d877 | 2836 | static int serial8250_console_early_setup(void) |
18a8bd94 YL |
2837 | { |
2838 | return serial8250_find_port_for_earlycon(); | |
2839 | } | |
2840 | ||
1da177e4 LT |
2841 | static struct console serial8250_console = { |
2842 | .name = "ttyS", | |
2843 | .write = serial8250_console_write, | |
2844 | .device = uart_console_device, | |
2845 | .setup = serial8250_console_setup, | |
18a8bd94 | 2846 | .early_setup = serial8250_console_early_setup, |
a80c49db | 2847 | .flags = CON_PRINTBUFFER | CON_ANYTIME, |
1da177e4 LT |
2848 | .index = -1, |
2849 | .data = &serial8250_reg, | |
2850 | }; | |
2851 | ||
2852 | static int __init serial8250_console_init(void) | |
2853 | { | |
05d81d22 EB |
2854 | if (nr_uarts > UART_NR) |
2855 | nr_uarts = UART_NR; | |
2856 | ||
1da177e4 LT |
2857 | serial8250_isa_init_ports(); |
2858 | register_console(&serial8250_console); | |
2859 | return 0; | |
2860 | } | |
2861 | console_initcall(serial8250_console_init); | |
2862 | ||
18a8bd94 | 2863 | int serial8250_find_port(struct uart_port *p) |
1da177e4 LT |
2864 | { |
2865 | int line; | |
2866 | struct uart_port *port; | |
2867 | ||
a61c2d78 | 2868 | for (line = 0; line < nr_uarts; line++) { |
1da177e4 | 2869 | port = &serial8250_ports[line].port; |
50aec3b5 | 2870 | if (uart_match_port(p, port)) |
1da177e4 LT |
2871 | return line; |
2872 | } | |
2873 | return -ENODEV; | |
2874 | } | |
2875 | ||
1da177e4 LT |
2876 | #define SERIAL8250_CONSOLE &serial8250_console |
2877 | #else | |
2878 | #define SERIAL8250_CONSOLE NULL | |
2879 | #endif | |
2880 | ||
2881 | static struct uart_driver serial8250_reg = { | |
2882 | .owner = THIS_MODULE, | |
2883 | .driver_name = "serial", | |
1da177e4 LT |
2884 | .dev_name = "ttyS", |
2885 | .major = TTY_MAJOR, | |
2886 | .minor = 64, | |
1da177e4 LT |
2887 | .cons = SERIAL8250_CONSOLE, |
2888 | }; | |
2889 | ||
d856c666 RK |
2890 | /* |
2891 | * early_serial_setup - early registration for 8250 ports | |
2892 | * | |
2893 | * Setup an 8250 port structure prior to console initialisation. Use | |
2894 | * after console initialisation will cause undefined behaviour. | |
2895 | */ | |
1da177e4 LT |
2896 | int __init early_serial_setup(struct uart_port *port) |
2897 | { | |
b430428a DD |
2898 | struct uart_port *p; |
2899 | ||
1da177e4 LT |
2900 | if (port->line >= ARRAY_SIZE(serial8250_ports)) |
2901 | return -ENODEV; | |
2902 | ||
2903 | serial8250_isa_init_ports(); | |
b430428a DD |
2904 | p = &serial8250_ports[port->line].port; |
2905 | p->iobase = port->iobase; | |
2906 | p->membase = port->membase; | |
2907 | p->irq = port->irq; | |
1c2f0493 | 2908 | p->irqflags = port->irqflags; |
b430428a DD |
2909 | p->uartclk = port->uartclk; |
2910 | p->fifosize = port->fifosize; | |
2911 | p->regshift = port->regshift; | |
2912 | p->iotype = port->iotype; | |
2913 | p->flags = port->flags; | |
2914 | p->mapbase = port->mapbase; | |
2915 | p->private_data = port->private_data; | |
125c97d8 HD |
2916 | p->type = port->type; |
2917 | p->line = port->line; | |
7d6a07d1 DD |
2918 | |
2919 | set_io_from_upio(p); | |
2920 | if (port->serial_in) | |
2921 | p->serial_in = port->serial_in; | |
2922 | if (port->serial_out) | |
2923 | p->serial_out = port->serial_out; | |
583d28e9 JI |
2924 | if (port->handle_irq) |
2925 | p->handle_irq = port->handle_irq; | |
2926 | else | |
2927 | p->handle_irq = serial8250_default_handle_irq; | |
7d6a07d1 | 2928 | |
1da177e4 LT |
2929 | return 0; |
2930 | } | |
2931 | ||
2932 | /** | |
2933 | * serial8250_suspend_port - suspend one serial port | |
2934 | * @line: serial line number | |
1da177e4 LT |
2935 | * |
2936 | * Suspend one serial port. | |
2937 | */ | |
2938 | void serial8250_suspend_port(int line) | |
2939 | { | |
2940 | uart_suspend_port(&serial8250_reg, &serial8250_ports[line].port); | |
2941 | } | |
2942 | ||
2943 | /** | |
2944 | * serial8250_resume_port - resume one serial port | |
2945 | * @line: serial line number | |
1da177e4 LT |
2946 | * |
2947 | * Resume one serial port. | |
2948 | */ | |
2949 | void serial8250_resume_port(int line) | |
2950 | { | |
b5b82df6 | 2951 | struct uart_8250_port *up = &serial8250_ports[line]; |
dfe42443 | 2952 | struct uart_port *port = &up->port; |
b5b82df6 DW |
2953 | |
2954 | if (up->capabilities & UART_NATSEMI) { | |
b5b82df6 | 2955 | /* Ensure it's still in high speed mode */ |
4fd996a1 | 2956 | serial_port_out(port, UART_LCR, 0xE0); |
b5b82df6 | 2957 | |
0d0389e5 | 2958 | ns16550a_goto_highspeed(up); |
b5b82df6 | 2959 | |
4fd996a1 | 2960 | serial_port_out(port, UART_LCR, 0); |
dfe42443 | 2961 | port->uartclk = 921600*16; |
b5b82df6 | 2962 | } |
dfe42443 | 2963 | uart_resume_port(&serial8250_reg, port); |
1da177e4 LT |
2964 | } |
2965 | ||
2966 | /* | |
2967 | * Register a set of serial devices attached to a platform device. The | |
2968 | * list is terminated with a zero flags entry, which means we expect | |
2969 | * all entries to have at least UPF_BOOT_AUTOCONF set. | |
2970 | */ | |
3ae5eaec | 2971 | static int __devinit serial8250_probe(struct platform_device *dev) |
1da177e4 | 2972 | { |
3ae5eaec | 2973 | struct plat_serial8250_port *p = dev->dev.platform_data; |
1da177e4 | 2974 | struct uart_port port; |
4c0ebb80 | 2975 | int ret, i, irqflag = 0; |
1da177e4 LT |
2976 | |
2977 | memset(&port, 0, sizeof(struct uart_port)); | |
2978 | ||
4c0ebb80 AGR |
2979 | if (share_irqs) |
2980 | irqflag = IRQF_SHARED; | |
2981 | ||
ec9f47cd | 2982 | for (i = 0; p && p->flags != 0; p++, i++) { |
74a19741 WN |
2983 | port.iobase = p->iobase; |
2984 | port.membase = p->membase; | |
2985 | port.irq = p->irq; | |
1c2f0493 | 2986 | port.irqflags = p->irqflags; |
74a19741 WN |
2987 | port.uartclk = p->uartclk; |
2988 | port.regshift = p->regshift; | |
2989 | port.iotype = p->iotype; | |
2990 | port.flags = p->flags; | |
2991 | port.mapbase = p->mapbase; | |
2992 | port.hub6 = p->hub6; | |
2993 | port.private_data = p->private_data; | |
8e23fcc8 | 2994 | port.type = p->type; |
7d6a07d1 DD |
2995 | port.serial_in = p->serial_in; |
2996 | port.serial_out = p->serial_out; | |
583d28e9 | 2997 | port.handle_irq = p->handle_irq; |
bf03f65b | 2998 | port.handle_break = p->handle_break; |
235dae5d | 2999 | port.set_termios = p->set_termios; |
c161afe9 | 3000 | port.pm = p->pm; |
74a19741 | 3001 | port.dev = &dev->dev; |
4c0ebb80 | 3002 | port.irqflags |= irqflag; |
ec9f47cd RK |
3003 | ret = serial8250_register_port(&port); |
3004 | if (ret < 0) { | |
3ae5eaec | 3005 | dev_err(&dev->dev, "unable to register port at index %d " |
4f640efb JB |
3006 | "(IO%lx MEM%llx IRQ%d): %d\n", i, |
3007 | p->iobase, (unsigned long long)p->mapbase, | |
3008 | p->irq, ret); | |
ec9f47cd | 3009 | } |
1da177e4 LT |
3010 | } |
3011 | return 0; | |
3012 | } | |
3013 | ||
3014 | /* | |
3015 | * Remove serial ports registered against a platform device. | |
3016 | */ | |
3ae5eaec | 3017 | static int __devexit serial8250_remove(struct platform_device *dev) |
1da177e4 LT |
3018 | { |
3019 | int i; | |
3020 | ||
a61c2d78 | 3021 | for (i = 0; i < nr_uarts; i++) { |
1da177e4 LT |
3022 | struct uart_8250_port *up = &serial8250_ports[i]; |
3023 | ||
3ae5eaec | 3024 | if (up->port.dev == &dev->dev) |
1da177e4 LT |
3025 | serial8250_unregister_port(i); |
3026 | } | |
3027 | return 0; | |
3028 | } | |
3029 | ||
3ae5eaec | 3030 | static int serial8250_suspend(struct platform_device *dev, pm_message_t state) |
1da177e4 LT |
3031 | { |
3032 | int i; | |
3033 | ||
1da177e4 LT |
3034 | for (i = 0; i < UART_NR; i++) { |
3035 | struct uart_8250_port *up = &serial8250_ports[i]; | |
3036 | ||
3ae5eaec | 3037 | if (up->port.type != PORT_UNKNOWN && up->port.dev == &dev->dev) |
1da177e4 LT |
3038 | uart_suspend_port(&serial8250_reg, &up->port); |
3039 | } | |
3040 | ||
3041 | return 0; | |
3042 | } | |
3043 | ||
3ae5eaec | 3044 | static int serial8250_resume(struct platform_device *dev) |
1da177e4 LT |
3045 | { |
3046 | int i; | |
3047 | ||
1da177e4 LT |
3048 | for (i = 0; i < UART_NR; i++) { |
3049 | struct uart_8250_port *up = &serial8250_ports[i]; | |
3050 | ||
3ae5eaec | 3051 | if (up->port.type != PORT_UNKNOWN && up->port.dev == &dev->dev) |
b5b82df6 | 3052 | serial8250_resume_port(i); |
1da177e4 LT |
3053 | } |
3054 | ||
3055 | return 0; | |
3056 | } | |
3057 | ||
3ae5eaec | 3058 | static struct platform_driver serial8250_isa_driver = { |
1da177e4 LT |
3059 | .probe = serial8250_probe, |
3060 | .remove = __devexit_p(serial8250_remove), | |
3061 | .suspend = serial8250_suspend, | |
3062 | .resume = serial8250_resume, | |
3ae5eaec RK |
3063 | .driver = { |
3064 | .name = "serial8250", | |
7493a314 | 3065 | .owner = THIS_MODULE, |
3ae5eaec | 3066 | }, |
1da177e4 LT |
3067 | }; |
3068 | ||
3069 | /* | |
3070 | * This "device" covers _all_ ISA 8250-compatible serial devices listed | |
3071 | * in the table in include/asm/serial.h | |
3072 | */ | |
3073 | static struct platform_device *serial8250_isa_devs; | |
3074 | ||
3075 | /* | |
3076 | * serial8250_register_port and serial8250_unregister_port allows for | |
3077 | * 16x50 serial ports to be configured at run-time, to support PCMCIA | |
3078 | * modems and PCI multiport cards. | |
3079 | */ | |
f392ecfa | 3080 | static DEFINE_MUTEX(serial_mutex); |
1da177e4 LT |
3081 | |
3082 | static struct uart_8250_port *serial8250_find_match_or_unused(struct uart_port *port) | |
3083 | { | |
3084 | int i; | |
3085 | ||
3086 | /* | |
3087 | * First, find a port entry which matches. | |
3088 | */ | |
a61c2d78 | 3089 | for (i = 0; i < nr_uarts; i++) |
1da177e4 LT |
3090 | if (uart_match_port(&serial8250_ports[i].port, port)) |
3091 | return &serial8250_ports[i]; | |
3092 | ||
3093 | /* | |
3094 | * We didn't find a matching entry, so look for the first | |
3095 | * free entry. We look for one which hasn't been previously | |
3096 | * used (indicated by zero iobase). | |
3097 | */ | |
a61c2d78 | 3098 | for (i = 0; i < nr_uarts; i++) |
1da177e4 LT |
3099 | if (serial8250_ports[i].port.type == PORT_UNKNOWN && |
3100 | serial8250_ports[i].port.iobase == 0) | |
3101 | return &serial8250_ports[i]; | |
3102 | ||
3103 | /* | |
3104 | * That also failed. Last resort is to find any entry which | |
3105 | * doesn't have a real port associated with it. | |
3106 | */ | |
a61c2d78 | 3107 | for (i = 0; i < nr_uarts; i++) |
1da177e4 LT |
3108 | if (serial8250_ports[i].port.type == PORT_UNKNOWN) |
3109 | return &serial8250_ports[i]; | |
3110 | ||
3111 | return NULL; | |
3112 | } | |
3113 | ||
3114 | /** | |
f73fa05b | 3115 | * serial8250_register_8250_port - register a serial port |
1da177e4 LT |
3116 | * @port: serial port template |
3117 | * | |
3118 | * Configure the serial port specified by the request. If the | |
3119 | * port exists and is in use, it is hung up and unregistered | |
3120 | * first. | |
3121 | * | |
3122 | * The port is then probed and if necessary the IRQ is autodetected | |
3123 | * If this fails an error is returned. | |
3124 | * | |
3125 | * On success the port is ready to use and the line number is returned. | |
3126 | */ | |
f73fa05b | 3127 | int serial8250_register_8250_port(struct uart_8250_port *up) |
1da177e4 LT |
3128 | { |
3129 | struct uart_8250_port *uart; | |
3130 | int ret = -ENOSPC; | |
3131 | ||
f73fa05b | 3132 | if (up->port.uartclk == 0) |
1da177e4 LT |
3133 | return -EINVAL; |
3134 | ||
f392ecfa | 3135 | mutex_lock(&serial_mutex); |
1da177e4 | 3136 | |
f73fa05b | 3137 | uart = serial8250_find_match_or_unused(&up->port); |
1da177e4 LT |
3138 | if (uart) { |
3139 | uart_remove_one_port(&serial8250_reg, &uart->port); | |
3140 | ||
f73fa05b MD |
3141 | uart->port.iobase = up->port.iobase; |
3142 | uart->port.membase = up->port.membase; | |
3143 | uart->port.irq = up->port.irq; | |
3144 | uart->port.irqflags = up->port.irqflags; | |
3145 | uart->port.uartclk = up->port.uartclk; | |
3146 | uart->port.fifosize = up->port.fifosize; | |
3147 | uart->port.regshift = up->port.regshift; | |
3148 | uart->port.iotype = up->port.iotype; | |
3149 | uart->port.flags = up->port.flags | UPF_BOOT_AUTOCONF; | |
3150 | uart->port.mapbase = up->port.mapbase; | |
3151 | uart->port.private_data = up->port.private_data; | |
3152 | if (up->port.dev) | |
3153 | uart->port.dev = up->port.dev; | |
3154 | ||
3155 | if (up->port.flags & UPF_FIXED_TYPE) | |
3156 | serial8250_init_fixed_type_port(uart, up->port.type); | |
8e23fcc8 | 3157 | |
7d6a07d1 DD |
3158 | set_io_from_upio(&uart->port); |
3159 | /* Possibly override default I/O functions. */ | |
f73fa05b MD |
3160 | if (up->port.serial_in) |
3161 | uart->port.serial_in = up->port.serial_in; | |
3162 | if (up->port.serial_out) | |
3163 | uart->port.serial_out = up->port.serial_out; | |
3164 | if (up->port.handle_irq) | |
3165 | uart->port.handle_irq = up->port.handle_irq; | |
235dae5d | 3166 | /* Possibly override set_termios call */ |
f73fa05b MD |
3167 | if (up->port.set_termios) |
3168 | uart->port.set_termios = up->port.set_termios; | |
3169 | if (up->port.pm) | |
3170 | uart->port.pm = up->port.pm; | |
3171 | if (up->port.handle_break) | |
3172 | uart->port.handle_break = up->port.handle_break; | |
3173 | if (up->dl_read) | |
3174 | uart->dl_read = up->dl_read; | |
3175 | if (up->dl_write) | |
3176 | uart->dl_write = up->dl_write; | |
1da177e4 | 3177 | |
af7f3743 AC |
3178 | if (serial8250_isa_config != NULL) |
3179 | serial8250_isa_config(0, &uart->port, | |
3180 | &uart->capabilities); | |
3181 | ||
1da177e4 LT |
3182 | ret = uart_add_one_port(&serial8250_reg, &uart->port); |
3183 | if (ret == 0) | |
3184 | ret = uart->port.line; | |
3185 | } | |
f392ecfa | 3186 | mutex_unlock(&serial_mutex); |
1da177e4 LT |
3187 | |
3188 | return ret; | |
3189 | } | |
f73fa05b MD |
3190 | EXPORT_SYMBOL(serial8250_register_8250_port); |
3191 | ||
3192 | /** | |
3193 | * serial8250_register_port - register a serial port | |
3194 | * @port: serial port template | |
3195 | * | |
3196 | * Configure the serial port specified by the request. If the | |
3197 | * port exists and is in use, it is hung up and unregistered | |
3198 | * first. | |
3199 | * | |
3200 | * The port is then probed and if necessary the IRQ is autodetected | |
3201 | * If this fails an error is returned. | |
3202 | * | |
3203 | * On success the port is ready to use and the line number is returned. | |
3204 | */ | |
3205 | int serial8250_register_port(struct uart_port *port) | |
3206 | { | |
3207 | struct uart_8250_port up; | |
3208 | ||
3209 | memset(&up, 0, sizeof(up)); | |
3210 | memcpy(&up.port, port, sizeof(*port)); | |
3211 | return serial8250_register_8250_port(&up); | |
3212 | } | |
1da177e4 LT |
3213 | EXPORT_SYMBOL(serial8250_register_port); |
3214 | ||
3215 | /** | |
3216 | * serial8250_unregister_port - remove a 16x50 serial port at runtime | |
3217 | * @line: serial line number | |
3218 | * | |
3219 | * Remove one serial port. This may not be called from interrupt | |
3220 | * context. We hand the port back to the our control. | |
3221 | */ | |
3222 | void serial8250_unregister_port(int line) | |
3223 | { | |
3224 | struct uart_8250_port *uart = &serial8250_ports[line]; | |
3225 | ||
f392ecfa | 3226 | mutex_lock(&serial_mutex); |
1da177e4 LT |
3227 | uart_remove_one_port(&serial8250_reg, &uart->port); |
3228 | if (serial8250_isa_devs) { | |
3229 | uart->port.flags &= ~UPF_BOOT_AUTOCONF; | |
3230 | uart->port.type = PORT_UNKNOWN; | |
3231 | uart->port.dev = &serial8250_isa_devs->dev; | |
cb01ece3 | 3232 | uart->capabilities = uart_config[uart->port.type].flags; |
1da177e4 LT |
3233 | uart_add_one_port(&serial8250_reg, &uart->port); |
3234 | } else { | |
3235 | uart->port.dev = NULL; | |
3236 | } | |
f392ecfa | 3237 | mutex_unlock(&serial_mutex); |
1da177e4 LT |
3238 | } |
3239 | EXPORT_SYMBOL(serial8250_unregister_port); | |
3240 | ||
3241 | static int __init serial8250_init(void) | |
3242 | { | |
25db8ad5 | 3243 | int ret; |
1da177e4 | 3244 | |
a61c2d78 DJ |
3245 | if (nr_uarts > UART_NR) |
3246 | nr_uarts = UART_NR; | |
3247 | ||
f1fb9bb8 | 3248 | printk(KERN_INFO "Serial: 8250/16550 driver, " |
a61c2d78 | 3249 | "%d ports, IRQ sharing %sabled\n", nr_uarts, |
1da177e4 LT |
3250 | share_irqs ? "en" : "dis"); |
3251 | ||
b70ac771 DM |
3252 | #ifdef CONFIG_SPARC |
3253 | ret = sunserial_register_minors(&serial8250_reg, UART_NR); | |
3254 | #else | |
3255 | serial8250_reg.nr = UART_NR; | |
1da177e4 | 3256 | ret = uart_register_driver(&serial8250_reg); |
b70ac771 | 3257 | #endif |
1da177e4 LT |
3258 | if (ret) |
3259 | goto out; | |
3260 | ||
7493a314 DT |
3261 | serial8250_isa_devs = platform_device_alloc("serial8250", |
3262 | PLAT8250_DEV_LEGACY); | |
3263 | if (!serial8250_isa_devs) { | |
3264 | ret = -ENOMEM; | |
bc965a7f | 3265 | goto unreg_uart_drv; |
1da177e4 LT |
3266 | } |
3267 | ||
7493a314 DT |
3268 | ret = platform_device_add(serial8250_isa_devs); |
3269 | if (ret) | |
3270 | goto put_dev; | |
3271 | ||
1da177e4 LT |
3272 | serial8250_register_ports(&serial8250_reg, &serial8250_isa_devs->dev); |
3273 | ||
bc965a7f RK |
3274 | ret = platform_driver_register(&serial8250_isa_driver); |
3275 | if (ret == 0) | |
3276 | goto out; | |
1da177e4 | 3277 | |
bc965a7f | 3278 | platform_device_del(serial8250_isa_devs); |
25db8ad5 | 3279 | put_dev: |
7493a314 | 3280 | platform_device_put(serial8250_isa_devs); |
25db8ad5 | 3281 | unreg_uart_drv: |
b70ac771 DM |
3282 | #ifdef CONFIG_SPARC |
3283 | sunserial_unregister_minors(&serial8250_reg, UART_NR); | |
3284 | #else | |
1da177e4 | 3285 | uart_unregister_driver(&serial8250_reg); |
b70ac771 | 3286 | #endif |
25db8ad5 | 3287 | out: |
1da177e4 LT |
3288 | return ret; |
3289 | } | |
3290 | ||
3291 | static void __exit serial8250_exit(void) | |
3292 | { | |
3293 | struct platform_device *isa_dev = serial8250_isa_devs; | |
3294 | ||
3295 | /* | |
3296 | * This tells serial8250_unregister_port() not to re-register | |
3297 | * the ports (thereby making serial8250_isa_driver permanently | |
3298 | * in use.) | |
3299 | */ | |
3300 | serial8250_isa_devs = NULL; | |
3301 | ||
3ae5eaec | 3302 | platform_driver_unregister(&serial8250_isa_driver); |
1da177e4 LT |
3303 | platform_device_unregister(isa_dev); |
3304 | ||
b70ac771 DM |
3305 | #ifdef CONFIG_SPARC |
3306 | sunserial_unregister_minors(&serial8250_reg, UART_NR); | |
3307 | #else | |
1da177e4 | 3308 | uart_unregister_driver(&serial8250_reg); |
b70ac771 | 3309 | #endif |
1da177e4 LT |
3310 | } |
3311 | ||
3312 | module_init(serial8250_init); | |
3313 | module_exit(serial8250_exit); | |
3314 | ||
3315 | EXPORT_SYMBOL(serial8250_suspend_port); | |
3316 | EXPORT_SYMBOL(serial8250_resume_port); | |
3317 | ||
3318 | MODULE_LICENSE("GPL"); | |
d87a6d95 | 3319 | MODULE_DESCRIPTION("Generic 8250/16x50 serial driver"); |
1da177e4 LT |
3320 | |
3321 | module_param(share_irqs, uint, 0644); | |
3322 | MODULE_PARM_DESC(share_irqs, "Share IRQs with other non-8250/16x50 devices" | |
3323 | " (unsafe)"); | |
3324 | ||
a61c2d78 DJ |
3325 | module_param(nr_uarts, uint, 0644); |
3326 | MODULE_PARM_DESC(nr_uarts, "Maximum number of UARTs supported. (1-" __MODULE_STRING(CONFIG_SERIAL_8250_NR_UARTS) ")"); | |
3327 | ||
d41a4b51 CE |
3328 | module_param(skip_txen_test, uint, 0644); |
3329 | MODULE_PARM_DESC(skip_txen_test, "Skip checking for the TXEN bug at init time"); | |
3330 | ||
1da177e4 LT |
3331 | #ifdef CONFIG_SERIAL_8250_RSA |
3332 | module_param_array(probe_rsa, ulong, &probe_rsa_count, 0444); | |
3333 | MODULE_PARM_DESC(probe_rsa, "Probe I/O ports for RSA"); | |
3334 | #endif | |
3335 | MODULE_ALIAS_CHARDEV_MAJOR(TTY_MAJOR); |