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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/drivers/char/8250.c | |
3 | * | |
4 | * Driver for 8250/16550-type serial ports | |
5 | * | |
6 | * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o. | |
7 | * | |
8 | * Copyright (C) 2001 Russell King. | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * $Id: 8250.c,v 1.90 2002/07/28 10:03:27 rmk Exp $ | |
16 | * | |
17 | * A note about mapbase / membase | |
18 | * | |
19 | * mapbase is the physical address of the IO port. | |
20 | * membase is an 'ioremapped' cookie. | |
21 | */ | |
1da177e4 LT |
22 | |
23 | #if defined(CONFIG_SERIAL_8250_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) | |
24 | #define SUPPORT_SYSRQ | |
25 | #endif | |
26 | ||
27 | #include <linux/module.h> | |
28 | #include <linux/moduleparam.h> | |
29 | #include <linux/ioport.h> | |
30 | #include <linux/init.h> | |
31 | #include <linux/console.h> | |
32 | #include <linux/sysrq.h> | |
1da177e4 | 33 | #include <linux/delay.h> |
d052d1be | 34 | #include <linux/platform_device.h> |
1da177e4 LT |
35 | #include <linux/tty.h> |
36 | #include <linux/tty_flip.h> | |
37 | #include <linux/serial_reg.h> | |
38 | #include <linux/serial_core.h> | |
39 | #include <linux/serial.h> | |
40 | #include <linux/serial_8250.h> | |
78512ece | 41 | #include <linux/nmi.h> |
f392ecfa | 42 | #include <linux/mutex.h> |
1da177e4 LT |
43 | |
44 | #include <asm/io.h> | |
45 | #include <asm/irq.h> | |
46 | ||
47 | #include "8250.h" | |
48 | ||
49 | /* | |
50 | * Configuration: | |
40663cc7 | 51 | * share_irqs - whether we pass IRQF_SHARED to request_irq(). This option |
1da177e4 LT |
52 | * is unsafe when used on edge-triggered interrupts. |
53 | */ | |
408b664a | 54 | static unsigned int share_irqs = SERIAL8250_SHARE_IRQS; |
1da177e4 | 55 | |
a61c2d78 DJ |
56 | static unsigned int nr_uarts = CONFIG_SERIAL_8250_RUNTIME_UARTS; |
57 | ||
1da177e4 LT |
58 | /* |
59 | * Debugging. | |
60 | */ | |
61 | #if 0 | |
62 | #define DEBUG_AUTOCONF(fmt...) printk(fmt) | |
63 | #else | |
64 | #define DEBUG_AUTOCONF(fmt...) do { } while (0) | |
65 | #endif | |
66 | ||
67 | #if 0 | |
68 | #define DEBUG_INTR(fmt...) printk(fmt) | |
69 | #else | |
70 | #define DEBUG_INTR(fmt...) do { } while (0) | |
71 | #endif | |
72 | ||
73 | #define PASS_LIMIT 256 | |
74 | ||
75 | /* | |
76 | * We default to IRQ0 for the "no irq" hack. Some | |
77 | * machine types want others as well - they're free | |
78 | * to redefine this in their header file. | |
79 | */ | |
80 | #define is_real_interrupt(irq) ((irq) != 0) | |
81 | ||
1da177e4 LT |
82 | #ifdef CONFIG_SERIAL_8250_DETECT_IRQ |
83 | #define CONFIG_SERIAL_DETECT_IRQ 1 | |
84 | #endif | |
1da177e4 LT |
85 | #ifdef CONFIG_SERIAL_8250_MANY_PORTS |
86 | #define CONFIG_SERIAL_MANY_PORTS 1 | |
87 | #endif | |
88 | ||
89 | /* | |
90 | * HUB6 is always on. This will be removed once the header | |
91 | * files have been cleaned. | |
92 | */ | |
93 | #define CONFIG_HUB6 1 | |
94 | ||
95 | #include <asm/serial.h> | |
96 | ||
97 | /* | |
98 | * SERIAL_PORT_DFNS tells us about built-in ports that have no | |
99 | * standard enumeration mechanism. Platforms that can find all | |
100 | * serial ports via mechanisms like ACPI or PCI need not supply it. | |
101 | */ | |
102 | #ifndef SERIAL_PORT_DFNS | |
103 | #define SERIAL_PORT_DFNS | |
104 | #endif | |
105 | ||
cb3592be | 106 | static const struct old_serial_port old_serial_port[] = { |
1da177e4 LT |
107 | SERIAL_PORT_DFNS /* defined in asm/serial.h */ |
108 | }; | |
109 | ||
026d02a2 | 110 | #define UART_NR CONFIG_SERIAL_8250_NR_UARTS |
1da177e4 LT |
111 | |
112 | #ifdef CONFIG_SERIAL_8250_RSA | |
113 | ||
114 | #define PORT_RSA_MAX 4 | |
115 | static unsigned long probe_rsa[PORT_RSA_MAX]; | |
116 | static unsigned int probe_rsa_count; | |
117 | #endif /* CONFIG_SERIAL_8250_RSA */ | |
118 | ||
119 | struct uart_8250_port { | |
120 | struct uart_port port; | |
121 | struct timer_list timer; /* "no irq" timer */ | |
122 | struct list_head list; /* ports on this IRQ */ | |
4ba5e35d RK |
123 | unsigned short capabilities; /* port capabilities */ |
124 | unsigned short bugs; /* port bugs */ | |
1da177e4 | 125 | unsigned int tx_loadsz; /* transmit fifo load size */ |
1da177e4 LT |
126 | unsigned char acr; |
127 | unsigned char ier; | |
128 | unsigned char lcr; | |
129 | unsigned char mcr; | |
130 | unsigned char mcr_mask; /* mask of user bits */ | |
131 | unsigned char mcr_force; /* mask of forced bits */ | |
132 | unsigned char lsr_break_flag; | |
133 | ||
134 | /* | |
135 | * We provide a per-port pm hook. | |
136 | */ | |
137 | void (*pm)(struct uart_port *port, | |
138 | unsigned int state, unsigned int old); | |
139 | }; | |
140 | ||
141 | struct irq_info { | |
142 | spinlock_t lock; | |
143 | struct list_head *head; | |
144 | }; | |
145 | ||
146 | static struct irq_info irq_lists[NR_IRQS]; | |
147 | ||
148 | /* | |
149 | * Here we define the default xmit fifo size used for each type of UART. | |
150 | */ | |
151 | static const struct serial8250_config uart_config[] = { | |
152 | [PORT_UNKNOWN] = { | |
153 | .name = "unknown", | |
154 | .fifo_size = 1, | |
155 | .tx_loadsz = 1, | |
156 | }, | |
157 | [PORT_8250] = { | |
158 | .name = "8250", | |
159 | .fifo_size = 1, | |
160 | .tx_loadsz = 1, | |
161 | }, | |
162 | [PORT_16450] = { | |
163 | .name = "16450", | |
164 | .fifo_size = 1, | |
165 | .tx_loadsz = 1, | |
166 | }, | |
167 | [PORT_16550] = { | |
168 | .name = "16550", | |
169 | .fifo_size = 1, | |
170 | .tx_loadsz = 1, | |
171 | }, | |
172 | [PORT_16550A] = { | |
173 | .name = "16550A", | |
174 | .fifo_size = 16, | |
175 | .tx_loadsz = 16, | |
176 | .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10, | |
177 | .flags = UART_CAP_FIFO, | |
178 | }, | |
179 | [PORT_CIRRUS] = { | |
180 | .name = "Cirrus", | |
181 | .fifo_size = 1, | |
182 | .tx_loadsz = 1, | |
183 | }, | |
184 | [PORT_16650] = { | |
185 | .name = "ST16650", | |
186 | .fifo_size = 1, | |
187 | .tx_loadsz = 1, | |
188 | .flags = UART_CAP_FIFO | UART_CAP_EFR | UART_CAP_SLEEP, | |
189 | }, | |
190 | [PORT_16650V2] = { | |
191 | .name = "ST16650V2", | |
192 | .fifo_size = 32, | |
193 | .tx_loadsz = 16, | |
194 | .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_01 | | |
195 | UART_FCR_T_TRIG_00, | |
196 | .flags = UART_CAP_FIFO | UART_CAP_EFR | UART_CAP_SLEEP, | |
197 | }, | |
198 | [PORT_16750] = { | |
199 | .name = "TI16750", | |
200 | .fifo_size = 64, | |
201 | .tx_loadsz = 64, | |
202 | .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10 | | |
203 | UART_FCR7_64BYTE, | |
204 | .flags = UART_CAP_FIFO | UART_CAP_SLEEP | UART_CAP_AFE, | |
205 | }, | |
206 | [PORT_STARTECH] = { | |
207 | .name = "Startech", | |
208 | .fifo_size = 1, | |
209 | .tx_loadsz = 1, | |
210 | }, | |
211 | [PORT_16C950] = { | |
212 | .name = "16C950/954", | |
213 | .fifo_size = 128, | |
214 | .tx_loadsz = 128, | |
215 | .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10, | |
216 | .flags = UART_CAP_FIFO, | |
217 | }, | |
218 | [PORT_16654] = { | |
219 | .name = "ST16654", | |
220 | .fifo_size = 64, | |
221 | .tx_loadsz = 32, | |
222 | .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_01 | | |
223 | UART_FCR_T_TRIG_10, | |
224 | .flags = UART_CAP_FIFO | UART_CAP_EFR | UART_CAP_SLEEP, | |
225 | }, | |
226 | [PORT_16850] = { | |
227 | .name = "XR16850", | |
228 | .fifo_size = 128, | |
229 | .tx_loadsz = 128, | |
230 | .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10, | |
231 | .flags = UART_CAP_FIFO | UART_CAP_EFR | UART_CAP_SLEEP, | |
232 | }, | |
233 | [PORT_RSA] = { | |
234 | .name = "RSA", | |
235 | .fifo_size = 2048, | |
236 | .tx_loadsz = 2048, | |
237 | .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_11, | |
238 | .flags = UART_CAP_FIFO, | |
239 | }, | |
240 | [PORT_NS16550A] = { | |
241 | .name = "NS16550A", | |
242 | .fifo_size = 16, | |
243 | .tx_loadsz = 16, | |
244 | .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10, | |
245 | .flags = UART_CAP_FIFO | UART_NATSEMI, | |
246 | }, | |
247 | [PORT_XSCALE] = { | |
248 | .name = "XScale", | |
249 | .fifo_size = 32, | |
250 | .tx_loadsz = 32, | |
251 | .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10, | |
252 | .flags = UART_CAP_FIFO | UART_CAP_UUE, | |
253 | }, | |
bd71c182 TK |
254 | [PORT_RM9000] = { |
255 | .name = "RM9000", | |
256 | .fifo_size = 16, | |
257 | .tx_loadsz = 16, | |
258 | .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10, | |
259 | .flags = UART_CAP_FIFO, | |
260 | }, | |
1da177e4 LT |
261 | }; |
262 | ||
bd71c182 | 263 | #if defined (CONFIG_SERIAL_8250_AU1X00) |
21c614a7 PA |
264 | |
265 | /* Au1x00 UART hardware has a weird register layout */ | |
266 | static const u8 au_io_in_map[] = { | |
267 | [UART_RX] = 0, | |
268 | [UART_IER] = 2, | |
269 | [UART_IIR] = 3, | |
270 | [UART_LCR] = 5, | |
271 | [UART_MCR] = 6, | |
272 | [UART_LSR] = 7, | |
273 | [UART_MSR] = 8, | |
274 | }; | |
275 | ||
276 | static const u8 au_io_out_map[] = { | |
277 | [UART_TX] = 1, | |
278 | [UART_IER] = 2, | |
279 | [UART_FCR] = 4, | |
280 | [UART_LCR] = 5, | |
281 | [UART_MCR] = 6, | |
282 | }; | |
283 | ||
284 | /* sane hardware needs no mapping */ | |
285 | static inline int map_8250_in_reg(struct uart_8250_port *up, int offset) | |
286 | { | |
287 | if (up->port.iotype != UPIO_AU) | |
288 | return offset; | |
289 | return au_io_in_map[offset]; | |
290 | } | |
291 | ||
292 | static inline int map_8250_out_reg(struct uart_8250_port *up, int offset) | |
293 | { | |
294 | if (up->port.iotype != UPIO_AU) | |
295 | return offset; | |
296 | return au_io_out_map[offset]; | |
297 | } | |
298 | ||
bd71c182 TK |
299 | #elif defined (CONFIG_SERIAL_8250_RM9K) |
300 | ||
301 | static const u8 | |
302 | regmap_in[8] = { | |
303 | [UART_RX] = 0x00, | |
304 | [UART_IER] = 0x0c, | |
305 | [UART_IIR] = 0x14, | |
306 | [UART_LCR] = 0x1c, | |
307 | [UART_MCR] = 0x20, | |
308 | [UART_LSR] = 0x24, | |
309 | [UART_MSR] = 0x28, | |
310 | [UART_SCR] = 0x2c | |
311 | }, | |
312 | regmap_out[8] = { | |
313 | [UART_TX] = 0x04, | |
314 | [UART_IER] = 0x0c, | |
315 | [UART_FCR] = 0x18, | |
316 | [UART_LCR] = 0x1c, | |
317 | [UART_MCR] = 0x20, | |
318 | [UART_LSR] = 0x24, | |
319 | [UART_MSR] = 0x28, | |
320 | [UART_SCR] = 0x2c | |
321 | }; | |
322 | ||
323 | static inline int map_8250_in_reg(struct uart_8250_port *up, int offset) | |
324 | { | |
325 | if (up->port.iotype != UPIO_RM9000) | |
326 | return offset; | |
327 | return regmap_in[offset]; | |
328 | } | |
329 | ||
330 | static inline int map_8250_out_reg(struct uart_8250_port *up, int offset) | |
331 | { | |
332 | if (up->port.iotype != UPIO_RM9000) | |
333 | return offset; | |
334 | return regmap_out[offset]; | |
335 | } | |
336 | ||
21c614a7 PA |
337 | #else |
338 | ||
339 | /* sane hardware needs no mapping */ | |
340 | #define map_8250_in_reg(up, offset) (offset) | |
341 | #define map_8250_out_reg(up, offset) (offset) | |
342 | ||
343 | #endif | |
344 | ||
ea8874dc | 345 | static unsigned int serial_in(struct uart_8250_port *up, int offset) |
1da177e4 | 346 | { |
3be91ec7 | 347 | unsigned int tmp; |
21c614a7 | 348 | offset = map_8250_in_reg(up, offset) << up->port.regshift; |
1da177e4 LT |
349 | |
350 | switch (up->port.iotype) { | |
351 | case UPIO_HUB6: | |
352 | outb(up->port.hub6 - 1 + offset, up->port.iobase); | |
353 | return inb(up->port.iobase + 1); | |
354 | ||
355 | case UPIO_MEM: | |
beab697a | 356 | case UPIO_DWAPB: |
1da177e4 LT |
357 | return readb(up->port.membase + offset); |
358 | ||
bd71c182 | 359 | case UPIO_RM9000: |
1da177e4 LT |
360 | case UPIO_MEM32: |
361 | return readl(up->port.membase + offset); | |
362 | ||
21c614a7 PA |
363 | #ifdef CONFIG_SERIAL_8250_AU1X00 |
364 | case UPIO_AU: | |
365 | return __raw_readl(up->port.membase + offset); | |
366 | #endif | |
367 | ||
3be91ec7 ZR |
368 | case UPIO_TSI: |
369 | if (offset == UART_IIR) { | |
9e84b60e AV |
370 | tmp = readl(up->port.membase + (UART_IIR & ~3)); |
371 | return (tmp >> 16) & 0xff; /* UART_IIR % 4 == 2 */ | |
3be91ec7 ZR |
372 | } else |
373 | return readb(up->port.membase + offset); | |
374 | ||
1da177e4 LT |
375 | default: |
376 | return inb(up->port.iobase + offset); | |
377 | } | |
378 | } | |
379 | ||
ea8874dc | 380 | static void |
1da177e4 LT |
381 | serial_out(struct uart_8250_port *up, int offset, int value) |
382 | { | |
beab697a MSJ |
383 | /* Save the offset before it's remapped */ |
384 | int save_offset = offset; | |
21c614a7 | 385 | offset = map_8250_out_reg(up, offset) << up->port.regshift; |
1da177e4 LT |
386 | |
387 | switch (up->port.iotype) { | |
388 | case UPIO_HUB6: | |
389 | outb(up->port.hub6 - 1 + offset, up->port.iobase); | |
390 | outb(value, up->port.iobase + 1); | |
391 | break; | |
392 | ||
393 | case UPIO_MEM: | |
394 | writeb(value, up->port.membase + offset); | |
395 | break; | |
396 | ||
bd71c182 | 397 | case UPIO_RM9000: |
1da177e4 LT |
398 | case UPIO_MEM32: |
399 | writel(value, up->port.membase + offset); | |
400 | break; | |
401 | ||
21c614a7 PA |
402 | #ifdef CONFIG_SERIAL_8250_AU1X00 |
403 | case UPIO_AU: | |
404 | __raw_writel(value, up->port.membase + offset); | |
405 | break; | |
406 | #endif | |
3be91ec7 ZR |
407 | case UPIO_TSI: |
408 | if (!((offset == UART_IER) && (value & UART_IER_UUE))) | |
409 | writeb(value, up->port.membase + offset); | |
410 | break; | |
21c614a7 | 411 | |
beab697a MSJ |
412 | case UPIO_DWAPB: |
413 | /* Save the LCR value so it can be re-written when a | |
414 | * Busy Detect interrupt occurs. */ | |
415 | if (save_offset == UART_LCR) | |
416 | up->lcr = value; | |
417 | writeb(value, up->port.membase + offset); | |
418 | /* Read the IER to ensure any interrupt is cleared before | |
419 | * returning from ISR. */ | |
420 | if (save_offset == UART_TX || save_offset == UART_IER) | |
421 | value = serial_in(up, UART_IER); | |
422 | break; | |
423 | ||
1da177e4 LT |
424 | default: |
425 | outb(value, up->port.iobase + offset); | |
426 | } | |
427 | } | |
428 | ||
40b36daa AW |
429 | static void |
430 | serial_out_sync(struct uart_8250_port *up, int offset, int value) | |
431 | { | |
432 | switch (up->port.iotype) { | |
433 | case UPIO_MEM: | |
434 | case UPIO_MEM32: | |
435 | #ifdef CONFIG_SERIAL_8250_AU1X00 | |
436 | case UPIO_AU: | |
437 | #endif | |
beab697a | 438 | case UPIO_DWAPB: |
40b36daa AW |
439 | serial_out(up, offset, value); |
440 | serial_in(up, UART_LCR); /* safe, no side-effects */ | |
441 | break; | |
442 | default: | |
443 | serial_out(up, offset, value); | |
444 | } | |
445 | } | |
446 | ||
1da177e4 LT |
447 | /* |
448 | * We used to support using pause I/O for certain machines. We | |
449 | * haven't supported this for a while, but just in case it's badly | |
450 | * needed for certain old 386 machines, I've left these #define's | |
451 | * in.... | |
452 | */ | |
453 | #define serial_inp(up, offset) serial_in(up, offset) | |
454 | #define serial_outp(up, offset, value) serial_out(up, offset, value) | |
455 | ||
b32b19b8 JAH |
456 | /* Uart divisor latch read */ |
457 | static inline int _serial_dl_read(struct uart_8250_port *up) | |
458 | { | |
459 | return serial_inp(up, UART_DLL) | serial_inp(up, UART_DLM) << 8; | |
460 | } | |
461 | ||
462 | /* Uart divisor latch write */ | |
463 | static inline void _serial_dl_write(struct uart_8250_port *up, int value) | |
464 | { | |
465 | serial_outp(up, UART_DLL, value & 0xff); | |
466 | serial_outp(up, UART_DLM, value >> 8 & 0xff); | |
467 | } | |
468 | ||
bd71c182 | 469 | #if defined (CONFIG_SERIAL_8250_AU1X00) |
b32b19b8 JAH |
470 | /* Au1x00 haven't got a standard divisor latch */ |
471 | static int serial_dl_read(struct uart_8250_port *up) | |
472 | { | |
473 | if (up->port.iotype == UPIO_AU) | |
474 | return __raw_readl(up->port.membase + 0x28); | |
475 | else | |
476 | return _serial_dl_read(up); | |
477 | } | |
478 | ||
479 | static void serial_dl_write(struct uart_8250_port *up, int value) | |
480 | { | |
481 | if (up->port.iotype == UPIO_AU) | |
482 | __raw_writel(value, up->port.membase + 0x28); | |
483 | else | |
484 | _serial_dl_write(up, value); | |
485 | } | |
bd71c182 TK |
486 | #elif defined (CONFIG_SERIAL_8250_RM9K) |
487 | static int serial_dl_read(struct uart_8250_port *up) | |
488 | { | |
489 | return (up->port.iotype == UPIO_RM9000) ? | |
490 | (((__raw_readl(up->port.membase + 0x10) << 8) | | |
491 | (__raw_readl(up->port.membase + 0x08) & 0xff)) & 0xffff) : | |
492 | _serial_dl_read(up); | |
493 | } | |
494 | ||
495 | static void serial_dl_write(struct uart_8250_port *up, int value) | |
496 | { | |
497 | if (up->port.iotype == UPIO_RM9000) { | |
498 | __raw_writel(value, up->port.membase + 0x08); | |
499 | __raw_writel(value >> 8, up->port.membase + 0x10); | |
500 | } else { | |
501 | _serial_dl_write(up, value); | |
502 | } | |
503 | } | |
b32b19b8 JAH |
504 | #else |
505 | #define serial_dl_read(up) _serial_dl_read(up) | |
506 | #define serial_dl_write(up, value) _serial_dl_write(up, value) | |
507 | #endif | |
1da177e4 LT |
508 | |
509 | /* | |
510 | * For the 16C950 | |
511 | */ | |
512 | static void serial_icr_write(struct uart_8250_port *up, int offset, int value) | |
513 | { | |
514 | serial_out(up, UART_SCR, offset); | |
515 | serial_out(up, UART_ICR, value); | |
516 | } | |
517 | ||
518 | static unsigned int serial_icr_read(struct uart_8250_port *up, int offset) | |
519 | { | |
520 | unsigned int value; | |
521 | ||
522 | serial_icr_write(up, UART_ACR, up->acr | UART_ACR_ICRRD); | |
523 | serial_out(up, UART_SCR, offset); | |
524 | value = serial_in(up, UART_ICR); | |
525 | serial_icr_write(up, UART_ACR, up->acr); | |
526 | ||
527 | return value; | |
528 | } | |
529 | ||
530 | /* | |
531 | * FIFO support. | |
532 | */ | |
533 | static inline void serial8250_clear_fifos(struct uart_8250_port *p) | |
534 | { | |
535 | if (p->capabilities & UART_CAP_FIFO) { | |
536 | serial_outp(p, UART_FCR, UART_FCR_ENABLE_FIFO); | |
537 | serial_outp(p, UART_FCR, UART_FCR_ENABLE_FIFO | | |
538 | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT); | |
539 | serial_outp(p, UART_FCR, 0); | |
540 | } | |
541 | } | |
542 | ||
543 | /* | |
544 | * IER sleep support. UARTs which have EFRs need the "extended | |
545 | * capability" bit enabled. Note that on XR16C850s, we need to | |
546 | * reset LCR to write to IER. | |
547 | */ | |
548 | static inline void serial8250_set_sleep(struct uart_8250_port *p, int sleep) | |
549 | { | |
550 | if (p->capabilities & UART_CAP_SLEEP) { | |
551 | if (p->capabilities & UART_CAP_EFR) { | |
552 | serial_outp(p, UART_LCR, 0xBF); | |
553 | serial_outp(p, UART_EFR, UART_EFR_ECB); | |
554 | serial_outp(p, UART_LCR, 0); | |
555 | } | |
556 | serial_outp(p, UART_IER, sleep ? UART_IERX_SLEEP : 0); | |
557 | if (p->capabilities & UART_CAP_EFR) { | |
558 | serial_outp(p, UART_LCR, 0xBF); | |
559 | serial_outp(p, UART_EFR, 0); | |
560 | serial_outp(p, UART_LCR, 0); | |
561 | } | |
562 | } | |
563 | } | |
564 | ||
565 | #ifdef CONFIG_SERIAL_8250_RSA | |
566 | /* | |
567 | * Attempts to turn on the RSA FIFO. Returns zero on failure. | |
568 | * We set the port uart clock rate if we succeed. | |
569 | */ | |
570 | static int __enable_rsa(struct uart_8250_port *up) | |
571 | { | |
572 | unsigned char mode; | |
573 | int result; | |
574 | ||
575 | mode = serial_inp(up, UART_RSA_MSR); | |
576 | result = mode & UART_RSA_MSR_FIFO; | |
577 | ||
578 | if (!result) { | |
579 | serial_outp(up, UART_RSA_MSR, mode | UART_RSA_MSR_FIFO); | |
580 | mode = serial_inp(up, UART_RSA_MSR); | |
581 | result = mode & UART_RSA_MSR_FIFO; | |
582 | } | |
583 | ||
584 | if (result) | |
585 | up->port.uartclk = SERIAL_RSA_BAUD_BASE * 16; | |
586 | ||
587 | return result; | |
588 | } | |
589 | ||
590 | static void enable_rsa(struct uart_8250_port *up) | |
591 | { | |
592 | if (up->port.type == PORT_RSA) { | |
593 | if (up->port.uartclk != SERIAL_RSA_BAUD_BASE * 16) { | |
594 | spin_lock_irq(&up->port.lock); | |
595 | __enable_rsa(up); | |
596 | spin_unlock_irq(&up->port.lock); | |
597 | } | |
598 | if (up->port.uartclk == SERIAL_RSA_BAUD_BASE * 16) | |
599 | serial_outp(up, UART_RSA_FRR, 0); | |
600 | } | |
601 | } | |
602 | ||
603 | /* | |
604 | * Attempts to turn off the RSA FIFO. Returns zero on failure. | |
605 | * It is unknown why interrupts were disabled in here. However, | |
606 | * the caller is expected to preserve this behaviour by grabbing | |
607 | * the spinlock before calling this function. | |
608 | */ | |
609 | static void disable_rsa(struct uart_8250_port *up) | |
610 | { | |
611 | unsigned char mode; | |
612 | int result; | |
613 | ||
614 | if (up->port.type == PORT_RSA && | |
615 | up->port.uartclk == SERIAL_RSA_BAUD_BASE * 16) { | |
616 | spin_lock_irq(&up->port.lock); | |
617 | ||
618 | mode = serial_inp(up, UART_RSA_MSR); | |
619 | result = !(mode & UART_RSA_MSR_FIFO); | |
620 | ||
621 | if (!result) { | |
622 | serial_outp(up, UART_RSA_MSR, mode & ~UART_RSA_MSR_FIFO); | |
623 | mode = serial_inp(up, UART_RSA_MSR); | |
624 | result = !(mode & UART_RSA_MSR_FIFO); | |
625 | } | |
626 | ||
627 | if (result) | |
628 | up->port.uartclk = SERIAL_RSA_BAUD_BASE_LO * 16; | |
629 | spin_unlock_irq(&up->port.lock); | |
630 | } | |
631 | } | |
632 | #endif /* CONFIG_SERIAL_8250_RSA */ | |
633 | ||
634 | /* | |
635 | * This is a quickie test to see how big the FIFO is. | |
636 | * It doesn't work at all the time, more's the pity. | |
637 | */ | |
638 | static int size_fifo(struct uart_8250_port *up) | |
639 | { | |
b32b19b8 JAH |
640 | unsigned char old_fcr, old_mcr, old_lcr; |
641 | unsigned short old_dl; | |
1da177e4 LT |
642 | int count; |
643 | ||
644 | old_lcr = serial_inp(up, UART_LCR); | |
645 | serial_outp(up, UART_LCR, 0); | |
646 | old_fcr = serial_inp(up, UART_FCR); | |
647 | old_mcr = serial_inp(up, UART_MCR); | |
648 | serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO | | |
649 | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT); | |
650 | serial_outp(up, UART_MCR, UART_MCR_LOOP); | |
651 | serial_outp(up, UART_LCR, UART_LCR_DLAB); | |
b32b19b8 JAH |
652 | old_dl = serial_dl_read(up); |
653 | serial_dl_write(up, 0x0001); | |
1da177e4 LT |
654 | serial_outp(up, UART_LCR, 0x03); |
655 | for (count = 0; count < 256; count++) | |
656 | serial_outp(up, UART_TX, count); | |
657 | mdelay(20);/* FIXME - schedule_timeout */ | |
658 | for (count = 0; (serial_inp(up, UART_LSR) & UART_LSR_DR) && | |
659 | (count < 256); count++) | |
660 | serial_inp(up, UART_RX); | |
661 | serial_outp(up, UART_FCR, old_fcr); | |
662 | serial_outp(up, UART_MCR, old_mcr); | |
663 | serial_outp(up, UART_LCR, UART_LCR_DLAB); | |
b32b19b8 | 664 | serial_dl_write(up, old_dl); |
1da177e4 LT |
665 | serial_outp(up, UART_LCR, old_lcr); |
666 | ||
667 | return count; | |
668 | } | |
669 | ||
670 | /* | |
671 | * Read UART ID using the divisor method - set DLL and DLM to zero | |
672 | * and the revision will be in DLL and device type in DLM. We | |
673 | * preserve the device state across this. | |
674 | */ | |
675 | static unsigned int autoconfig_read_divisor_id(struct uart_8250_port *p) | |
676 | { | |
677 | unsigned char old_dll, old_dlm, old_lcr; | |
678 | unsigned int id; | |
679 | ||
680 | old_lcr = serial_inp(p, UART_LCR); | |
681 | serial_outp(p, UART_LCR, UART_LCR_DLAB); | |
682 | ||
683 | old_dll = serial_inp(p, UART_DLL); | |
684 | old_dlm = serial_inp(p, UART_DLM); | |
685 | ||
686 | serial_outp(p, UART_DLL, 0); | |
687 | serial_outp(p, UART_DLM, 0); | |
688 | ||
689 | id = serial_inp(p, UART_DLL) | serial_inp(p, UART_DLM) << 8; | |
690 | ||
691 | serial_outp(p, UART_DLL, old_dll); | |
692 | serial_outp(p, UART_DLM, old_dlm); | |
693 | serial_outp(p, UART_LCR, old_lcr); | |
694 | ||
695 | return id; | |
696 | } | |
697 | ||
698 | /* | |
699 | * This is a helper routine to autodetect StarTech/Exar/Oxsemi UART's. | |
700 | * When this function is called we know it is at least a StarTech | |
701 | * 16650 V2, but it might be one of several StarTech UARTs, or one of | |
702 | * its clones. (We treat the broken original StarTech 16650 V1 as a | |
703 | * 16550, and why not? Startech doesn't seem to even acknowledge its | |
704 | * existence.) | |
bd71c182 | 705 | * |
1da177e4 LT |
706 | * What evil have men's minds wrought... |
707 | */ | |
708 | static void autoconfig_has_efr(struct uart_8250_port *up) | |
709 | { | |
710 | unsigned int id1, id2, id3, rev; | |
711 | ||
712 | /* | |
713 | * Everything with an EFR has SLEEP | |
714 | */ | |
715 | up->capabilities |= UART_CAP_EFR | UART_CAP_SLEEP; | |
716 | ||
717 | /* | |
718 | * First we check to see if it's an Oxford Semiconductor UART. | |
719 | * | |
720 | * If we have to do this here because some non-National | |
721 | * Semiconductor clone chips lock up if you try writing to the | |
722 | * LSR register (which serial_icr_read does) | |
723 | */ | |
724 | ||
725 | /* | |
726 | * Check for Oxford Semiconductor 16C950. | |
727 | * | |
728 | * EFR [4] must be set else this test fails. | |
729 | * | |
730 | * This shouldn't be necessary, but Mike Hudson (Exoray@isys.ca) | |
731 | * claims that it's needed for 952 dual UART's (which are not | |
732 | * recommended for new designs). | |
733 | */ | |
734 | up->acr = 0; | |
735 | serial_out(up, UART_LCR, 0xBF); | |
736 | serial_out(up, UART_EFR, UART_EFR_ECB); | |
737 | serial_out(up, UART_LCR, 0x00); | |
738 | id1 = serial_icr_read(up, UART_ID1); | |
739 | id2 = serial_icr_read(up, UART_ID2); | |
740 | id3 = serial_icr_read(up, UART_ID3); | |
741 | rev = serial_icr_read(up, UART_REV); | |
742 | ||
743 | DEBUG_AUTOCONF("950id=%02x:%02x:%02x:%02x ", id1, id2, id3, rev); | |
744 | ||
745 | if (id1 == 0x16 && id2 == 0xC9 && | |
746 | (id3 == 0x50 || id3 == 0x52 || id3 == 0x54)) { | |
747 | up->port.type = PORT_16C950; | |
4ba5e35d RK |
748 | |
749 | /* | |
750 | * Enable work around for the Oxford Semiconductor 952 rev B | |
751 | * chip which causes it to seriously miscalculate baud rates | |
752 | * when DLL is 0. | |
753 | */ | |
754 | if (id3 == 0x52 && rev == 0x01) | |
755 | up->bugs |= UART_BUG_QUOT; | |
1da177e4 LT |
756 | return; |
757 | } | |
bd71c182 | 758 | |
1da177e4 LT |
759 | /* |
760 | * We check for a XR16C850 by setting DLL and DLM to 0, and then | |
761 | * reading back DLL and DLM. The chip type depends on the DLM | |
762 | * value read back: | |
763 | * 0x10 - XR16C850 and the DLL contains the chip revision. | |
764 | * 0x12 - XR16C2850. | |
765 | * 0x14 - XR16C854. | |
766 | */ | |
767 | id1 = autoconfig_read_divisor_id(up); | |
768 | DEBUG_AUTOCONF("850id=%04x ", id1); | |
769 | ||
770 | id2 = id1 >> 8; | |
771 | if (id2 == 0x10 || id2 == 0x12 || id2 == 0x14) { | |
1da177e4 LT |
772 | up->port.type = PORT_16850; |
773 | return; | |
774 | } | |
775 | ||
776 | /* | |
777 | * It wasn't an XR16C850. | |
778 | * | |
779 | * We distinguish between the '654 and the '650 by counting | |
780 | * how many bytes are in the FIFO. I'm using this for now, | |
781 | * since that's the technique that was sent to me in the | |
782 | * serial driver update, but I'm not convinced this works. | |
783 | * I've had problems doing this in the past. -TYT | |
784 | */ | |
785 | if (size_fifo(up) == 64) | |
786 | up->port.type = PORT_16654; | |
787 | else | |
788 | up->port.type = PORT_16650V2; | |
789 | } | |
790 | ||
791 | /* | |
792 | * We detected a chip without a FIFO. Only two fall into | |
793 | * this category - the original 8250 and the 16450. The | |
794 | * 16450 has a scratch register (accessible with LCR=0) | |
795 | */ | |
796 | static void autoconfig_8250(struct uart_8250_port *up) | |
797 | { | |
798 | unsigned char scratch, status1, status2; | |
799 | ||
800 | up->port.type = PORT_8250; | |
801 | ||
802 | scratch = serial_in(up, UART_SCR); | |
803 | serial_outp(up, UART_SCR, 0xa5); | |
804 | status1 = serial_in(up, UART_SCR); | |
805 | serial_outp(up, UART_SCR, 0x5a); | |
806 | status2 = serial_in(up, UART_SCR); | |
807 | serial_outp(up, UART_SCR, scratch); | |
808 | ||
809 | if (status1 == 0xa5 && status2 == 0x5a) | |
810 | up->port.type = PORT_16450; | |
811 | } | |
812 | ||
813 | static int broken_efr(struct uart_8250_port *up) | |
814 | { | |
815 | /* | |
816 | * Exar ST16C2550 "A2" devices incorrectly detect as | |
817 | * having an EFR, and report an ID of 0x0201. See | |
818 | * http://www.exar.com/info.php?pdf=dan180_oct2004.pdf | |
819 | */ | |
820 | if (autoconfig_read_divisor_id(up) == 0x0201 && size_fifo(up) == 16) | |
821 | return 1; | |
822 | ||
823 | return 0; | |
824 | } | |
825 | ||
826 | /* | |
827 | * We know that the chip has FIFOs. Does it have an EFR? The | |
828 | * EFR is located in the same register position as the IIR and | |
829 | * we know the top two bits of the IIR are currently set. The | |
830 | * EFR should contain zero. Try to read the EFR. | |
831 | */ | |
832 | static void autoconfig_16550a(struct uart_8250_port *up) | |
833 | { | |
834 | unsigned char status1, status2; | |
835 | unsigned int iersave; | |
836 | ||
837 | up->port.type = PORT_16550A; | |
838 | up->capabilities |= UART_CAP_FIFO; | |
839 | ||
840 | /* | |
841 | * Check for presence of the EFR when DLAB is set. | |
842 | * Only ST16C650V1 UARTs pass this test. | |
843 | */ | |
844 | serial_outp(up, UART_LCR, UART_LCR_DLAB); | |
845 | if (serial_in(up, UART_EFR) == 0) { | |
846 | serial_outp(up, UART_EFR, 0xA8); | |
847 | if (serial_in(up, UART_EFR) != 0) { | |
848 | DEBUG_AUTOCONF("EFRv1 "); | |
849 | up->port.type = PORT_16650; | |
850 | up->capabilities |= UART_CAP_EFR | UART_CAP_SLEEP; | |
851 | } else { | |
852 | DEBUG_AUTOCONF("Motorola 8xxx DUART "); | |
853 | } | |
854 | serial_outp(up, UART_EFR, 0); | |
855 | return; | |
856 | } | |
857 | ||
858 | /* | |
859 | * Maybe it requires 0xbf to be written to the LCR. | |
860 | * (other ST16C650V2 UARTs, TI16C752A, etc) | |
861 | */ | |
862 | serial_outp(up, UART_LCR, 0xBF); | |
863 | if (serial_in(up, UART_EFR) == 0 && !broken_efr(up)) { | |
864 | DEBUG_AUTOCONF("EFRv2 "); | |
865 | autoconfig_has_efr(up); | |
866 | return; | |
867 | } | |
868 | ||
869 | /* | |
870 | * Check for a National Semiconductor SuperIO chip. | |
871 | * Attempt to switch to bank 2, read the value of the LOOP bit | |
872 | * from EXCR1. Switch back to bank 0, change it in MCR. Then | |
873 | * switch back to bank 2, read it from EXCR1 again and check | |
874 | * it's changed. If so, set baud_base in EXCR2 to 921600. -- dwmw2 | |
1da177e4 LT |
875 | */ |
876 | serial_outp(up, UART_LCR, 0); | |
877 | status1 = serial_in(up, UART_MCR); | |
878 | serial_outp(up, UART_LCR, 0xE0); | |
879 | status2 = serial_in(up, 0x02); /* EXCR1 */ | |
880 | ||
881 | if (!((status2 ^ status1) & UART_MCR_LOOP)) { | |
882 | serial_outp(up, UART_LCR, 0); | |
883 | serial_outp(up, UART_MCR, status1 ^ UART_MCR_LOOP); | |
884 | serial_outp(up, UART_LCR, 0xE0); | |
885 | status2 = serial_in(up, 0x02); /* EXCR1 */ | |
886 | serial_outp(up, UART_LCR, 0); | |
887 | serial_outp(up, UART_MCR, status1); | |
888 | ||
889 | if ((status2 ^ status1) & UART_MCR_LOOP) { | |
857dde2e DW |
890 | unsigned short quot; |
891 | ||
1da177e4 | 892 | serial_outp(up, UART_LCR, 0xE0); |
857dde2e | 893 | |
b32b19b8 | 894 | quot = serial_dl_read(up); |
857dde2e DW |
895 | quot <<= 3; |
896 | ||
1da177e4 LT |
897 | status1 = serial_in(up, 0x04); /* EXCR1 */ |
898 | status1 &= ~0xB0; /* Disable LOCK, mask out PRESL[01] */ | |
899 | status1 |= 0x10; /* 1.625 divisor for baud_base --> 921600 */ | |
900 | serial_outp(up, 0x04, status1); | |
bd71c182 | 901 | |
b32b19b8 | 902 | serial_dl_write(up, quot); |
857dde2e | 903 | |
1da177e4 | 904 | serial_outp(up, UART_LCR, 0); |
1da177e4 | 905 | |
857dde2e | 906 | up->port.uartclk = 921600*16; |
1da177e4 LT |
907 | up->port.type = PORT_NS16550A; |
908 | up->capabilities |= UART_NATSEMI; | |
909 | return; | |
910 | } | |
911 | } | |
912 | ||
913 | /* | |
914 | * No EFR. Try to detect a TI16750, which only sets bit 5 of | |
915 | * the IIR when 64 byte FIFO mode is enabled when DLAB is set. | |
916 | * Try setting it with and without DLAB set. Cheap clones | |
917 | * set bit 5 without DLAB set. | |
918 | */ | |
919 | serial_outp(up, UART_LCR, 0); | |
920 | serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO | UART_FCR7_64BYTE); | |
921 | status1 = serial_in(up, UART_IIR) >> 5; | |
922 | serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO); | |
923 | serial_outp(up, UART_LCR, UART_LCR_DLAB); | |
924 | serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO | UART_FCR7_64BYTE); | |
925 | status2 = serial_in(up, UART_IIR) >> 5; | |
926 | serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO); | |
927 | serial_outp(up, UART_LCR, 0); | |
928 | ||
929 | DEBUG_AUTOCONF("iir1=%d iir2=%d ", status1, status2); | |
930 | ||
931 | if (status1 == 6 && status2 == 7) { | |
932 | up->port.type = PORT_16750; | |
933 | up->capabilities |= UART_CAP_AFE | UART_CAP_SLEEP; | |
934 | return; | |
935 | } | |
936 | ||
937 | /* | |
938 | * Try writing and reading the UART_IER_UUE bit (b6). | |
939 | * If it works, this is probably one of the Xscale platform's | |
940 | * internal UARTs. | |
941 | * We're going to explicitly set the UUE bit to 0 before | |
942 | * trying to write and read a 1 just to make sure it's not | |
943 | * already a 1 and maybe locked there before we even start start. | |
944 | */ | |
945 | iersave = serial_in(up, UART_IER); | |
946 | serial_outp(up, UART_IER, iersave & ~UART_IER_UUE); | |
947 | if (!(serial_in(up, UART_IER) & UART_IER_UUE)) { | |
948 | /* | |
949 | * OK it's in a known zero state, try writing and reading | |
950 | * without disturbing the current state of the other bits. | |
951 | */ | |
952 | serial_outp(up, UART_IER, iersave | UART_IER_UUE); | |
953 | if (serial_in(up, UART_IER) & UART_IER_UUE) { | |
954 | /* | |
955 | * It's an Xscale. | |
956 | * We'll leave the UART_IER_UUE bit set to 1 (enabled). | |
957 | */ | |
958 | DEBUG_AUTOCONF("Xscale "); | |
959 | up->port.type = PORT_XSCALE; | |
960 | up->capabilities |= UART_CAP_UUE; | |
961 | return; | |
962 | } | |
963 | } else { | |
964 | /* | |
965 | * If we got here we couldn't force the IER_UUE bit to 0. | |
966 | * Log it and continue. | |
967 | */ | |
968 | DEBUG_AUTOCONF("Couldn't force IER_UUE to 0 "); | |
969 | } | |
970 | serial_outp(up, UART_IER, iersave); | |
971 | } | |
972 | ||
973 | /* | |
974 | * This routine is called by rs_init() to initialize a specific serial | |
975 | * port. It determines what type of UART chip this serial port is | |
976 | * using: 8250, 16450, 16550, 16550A. The important question is | |
977 | * whether or not this UART is a 16550A or not, since this will | |
978 | * determine whether or not we can use its FIFO features or not. | |
979 | */ | |
980 | static void autoconfig(struct uart_8250_port *up, unsigned int probeflags) | |
981 | { | |
982 | unsigned char status1, scratch, scratch2, scratch3; | |
983 | unsigned char save_lcr, save_mcr; | |
984 | unsigned long flags; | |
985 | ||
986 | if (!up->port.iobase && !up->port.mapbase && !up->port.membase) | |
987 | return; | |
988 | ||
989 | DEBUG_AUTOCONF("ttyS%d: autoconf (0x%04x, 0x%p): ", | |
990 | up->port.line, up->port.iobase, up->port.membase); | |
991 | ||
992 | /* | |
993 | * We really do need global IRQs disabled here - we're going to | |
994 | * be frobbing the chips IRQ enable register to see if it exists. | |
995 | */ | |
996 | spin_lock_irqsave(&up->port.lock, flags); | |
997 | // save_flags(flags); cli(); | |
998 | ||
999 | up->capabilities = 0; | |
4ba5e35d | 1000 | up->bugs = 0; |
1da177e4 LT |
1001 | |
1002 | if (!(up->port.flags & UPF_BUGGY_UART)) { | |
1003 | /* | |
1004 | * Do a simple existence test first; if we fail this, | |
1005 | * there's no point trying anything else. | |
bd71c182 | 1006 | * |
1da177e4 LT |
1007 | * 0x80 is used as a nonsense port to prevent against |
1008 | * false positives due to ISA bus float. The | |
1009 | * assumption is that 0x80 is a non-existent port; | |
1010 | * which should be safe since include/asm/io.h also | |
1011 | * makes this assumption. | |
1012 | * | |
1013 | * Note: this is safe as long as MCR bit 4 is clear | |
1014 | * and the device is in "PC" mode. | |
1015 | */ | |
1016 | scratch = serial_inp(up, UART_IER); | |
1017 | serial_outp(up, UART_IER, 0); | |
1018 | #ifdef __i386__ | |
1019 | outb(0xff, 0x080); | |
1020 | #endif | |
48212008 TH |
1021 | /* |
1022 | * Mask out IER[7:4] bits for test as some UARTs (e.g. TL | |
1023 | * 16C754B) allow only to modify them if an EFR bit is set. | |
1024 | */ | |
1025 | scratch2 = serial_inp(up, UART_IER) & 0x0f; | |
1da177e4 LT |
1026 | serial_outp(up, UART_IER, 0x0F); |
1027 | #ifdef __i386__ | |
1028 | outb(0, 0x080); | |
1029 | #endif | |
48212008 | 1030 | scratch3 = serial_inp(up, UART_IER) & 0x0f; |
1da177e4 LT |
1031 | serial_outp(up, UART_IER, scratch); |
1032 | if (scratch2 != 0 || scratch3 != 0x0F) { | |
1033 | /* | |
1034 | * We failed; there's nothing here | |
1035 | */ | |
1036 | DEBUG_AUTOCONF("IER test failed (%02x, %02x) ", | |
1037 | scratch2, scratch3); | |
1038 | goto out; | |
1039 | } | |
1040 | } | |
1041 | ||
1042 | save_mcr = serial_in(up, UART_MCR); | |
1043 | save_lcr = serial_in(up, UART_LCR); | |
1044 | ||
bd71c182 | 1045 | /* |
1da177e4 LT |
1046 | * Check to see if a UART is really there. Certain broken |
1047 | * internal modems based on the Rockwell chipset fail this | |
1048 | * test, because they apparently don't implement the loopback | |
1049 | * test mode. So this test is skipped on the COM 1 through | |
1050 | * COM 4 ports. This *should* be safe, since no board | |
1051 | * manufacturer would be stupid enough to design a board | |
1052 | * that conflicts with COM 1-4 --- we hope! | |
1053 | */ | |
1054 | if (!(up->port.flags & UPF_SKIP_TEST)) { | |
1055 | serial_outp(up, UART_MCR, UART_MCR_LOOP | 0x0A); | |
1056 | status1 = serial_inp(up, UART_MSR) & 0xF0; | |
1057 | serial_outp(up, UART_MCR, save_mcr); | |
1058 | if (status1 != 0x90) { | |
1059 | DEBUG_AUTOCONF("LOOP test failed (%02x) ", | |
1060 | status1); | |
1061 | goto out; | |
1062 | } | |
1063 | } | |
1064 | ||
1065 | /* | |
1066 | * We're pretty sure there's a port here. Lets find out what | |
1067 | * type of port it is. The IIR top two bits allows us to find | |
6f0d618f | 1068 | * out if it's 8250 or 16450, 16550, 16550A or later. This |
1da177e4 LT |
1069 | * determines what we test for next. |
1070 | * | |
1071 | * We also initialise the EFR (if any) to zero for later. The | |
1072 | * EFR occupies the same register location as the FCR and IIR. | |
1073 | */ | |
1074 | serial_outp(up, UART_LCR, 0xBF); | |
1075 | serial_outp(up, UART_EFR, 0); | |
1076 | serial_outp(up, UART_LCR, 0); | |
1077 | ||
1078 | serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO); | |
1079 | scratch = serial_in(up, UART_IIR) >> 6; | |
1080 | ||
1081 | DEBUG_AUTOCONF("iir=%d ", scratch); | |
1082 | ||
1083 | switch (scratch) { | |
1084 | case 0: | |
1085 | autoconfig_8250(up); | |
1086 | break; | |
1087 | case 1: | |
1088 | up->port.type = PORT_UNKNOWN; | |
1089 | break; | |
1090 | case 2: | |
1091 | up->port.type = PORT_16550; | |
1092 | break; | |
1093 | case 3: | |
1094 | autoconfig_16550a(up); | |
1095 | break; | |
1096 | } | |
1097 | ||
1098 | #ifdef CONFIG_SERIAL_8250_RSA | |
1099 | /* | |
1100 | * Only probe for RSA ports if we got the region. | |
1101 | */ | |
1102 | if (up->port.type == PORT_16550A && probeflags & PROBE_RSA) { | |
1103 | int i; | |
1104 | ||
1105 | for (i = 0 ; i < probe_rsa_count; ++i) { | |
1106 | if (probe_rsa[i] == up->port.iobase && | |
1107 | __enable_rsa(up)) { | |
1108 | up->port.type = PORT_RSA; | |
1109 | break; | |
1110 | } | |
1111 | } | |
1112 | } | |
1113 | #endif | |
21c614a7 PA |
1114 | |
1115 | #ifdef CONFIG_SERIAL_8250_AU1X00 | |
1116 | /* if access method is AU, it is a 16550 with a quirk */ | |
1117 | if (up->port.type == PORT_16550A && up->port.iotype == UPIO_AU) | |
1118 | up->bugs |= UART_BUG_NOMSR; | |
1119 | #endif | |
1120 | ||
1da177e4 LT |
1121 | serial_outp(up, UART_LCR, save_lcr); |
1122 | ||
1123 | if (up->capabilities != uart_config[up->port.type].flags) { | |
1124 | printk(KERN_WARNING | |
1125 | "ttyS%d: detected caps %08x should be %08x\n", | |
1126 | up->port.line, up->capabilities, | |
1127 | uart_config[up->port.type].flags); | |
1128 | } | |
1129 | ||
1130 | up->port.fifosize = uart_config[up->port.type].fifo_size; | |
1131 | up->capabilities = uart_config[up->port.type].flags; | |
1132 | up->tx_loadsz = uart_config[up->port.type].tx_loadsz; | |
1133 | ||
1134 | if (up->port.type == PORT_UNKNOWN) | |
1135 | goto out; | |
1136 | ||
1137 | /* | |
1138 | * Reset the UART. | |
1139 | */ | |
1140 | #ifdef CONFIG_SERIAL_8250_RSA | |
1141 | if (up->port.type == PORT_RSA) | |
1142 | serial_outp(up, UART_RSA_FRR, 0); | |
1143 | #endif | |
1144 | serial_outp(up, UART_MCR, save_mcr); | |
1145 | serial8250_clear_fifos(up); | |
40b36daa | 1146 | serial_in(up, UART_RX); |
5c8c755c LB |
1147 | if (up->capabilities & UART_CAP_UUE) |
1148 | serial_outp(up, UART_IER, UART_IER_UUE); | |
1149 | else | |
1150 | serial_outp(up, UART_IER, 0); | |
1da177e4 | 1151 | |
bd71c182 | 1152 | out: |
1da177e4 LT |
1153 | spin_unlock_irqrestore(&up->port.lock, flags); |
1154 | // restore_flags(flags); | |
1155 | DEBUG_AUTOCONF("type=%s\n", uart_config[up->port.type].name); | |
1156 | } | |
1157 | ||
1158 | static void autoconfig_irq(struct uart_8250_port *up) | |
1159 | { | |
1160 | unsigned char save_mcr, save_ier; | |
1161 | unsigned char save_ICP = 0; | |
1162 | unsigned int ICP = 0; | |
1163 | unsigned long irqs; | |
1164 | int irq; | |
1165 | ||
1166 | if (up->port.flags & UPF_FOURPORT) { | |
1167 | ICP = (up->port.iobase & 0xfe0) | 0x1f; | |
1168 | save_ICP = inb_p(ICP); | |
1169 | outb_p(0x80, ICP); | |
1170 | (void) inb_p(ICP); | |
1171 | } | |
1172 | ||
1173 | /* forget possible initially masked and pending IRQ */ | |
1174 | probe_irq_off(probe_irq_on()); | |
1175 | save_mcr = serial_inp(up, UART_MCR); | |
1176 | save_ier = serial_inp(up, UART_IER); | |
1177 | serial_outp(up, UART_MCR, UART_MCR_OUT1 | UART_MCR_OUT2); | |
bd71c182 | 1178 | |
1da177e4 LT |
1179 | irqs = probe_irq_on(); |
1180 | serial_outp(up, UART_MCR, 0); | |
1181 | udelay (10); | |
1182 | if (up->port.flags & UPF_FOURPORT) { | |
1183 | serial_outp(up, UART_MCR, | |
1184 | UART_MCR_DTR | UART_MCR_RTS); | |
1185 | } else { | |
1186 | serial_outp(up, UART_MCR, | |
1187 | UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2); | |
1188 | } | |
1189 | serial_outp(up, UART_IER, 0x0f); /* enable all intrs */ | |
1190 | (void)serial_inp(up, UART_LSR); | |
1191 | (void)serial_inp(up, UART_RX); | |
1192 | (void)serial_inp(up, UART_IIR); | |
1193 | (void)serial_inp(up, UART_MSR); | |
1194 | serial_outp(up, UART_TX, 0xFF); | |
1195 | udelay (20); | |
1196 | irq = probe_irq_off(irqs); | |
1197 | ||
1198 | serial_outp(up, UART_MCR, save_mcr); | |
1199 | serial_outp(up, UART_IER, save_ier); | |
1200 | ||
1201 | if (up->port.flags & UPF_FOURPORT) | |
1202 | outb_p(save_ICP, ICP); | |
1203 | ||
1204 | up->port.irq = (irq > 0) ? irq : 0; | |
1205 | } | |
1206 | ||
e763b90c RK |
1207 | static inline void __stop_tx(struct uart_8250_port *p) |
1208 | { | |
1209 | if (p->ier & UART_IER_THRI) { | |
1210 | p->ier &= ~UART_IER_THRI; | |
1211 | serial_out(p, UART_IER, p->ier); | |
1212 | } | |
1213 | } | |
1214 | ||
b129a8cc | 1215 | static void serial8250_stop_tx(struct uart_port *port) |
1da177e4 LT |
1216 | { |
1217 | struct uart_8250_port *up = (struct uart_8250_port *)port; | |
1218 | ||
e763b90c | 1219 | __stop_tx(up); |
1da177e4 LT |
1220 | |
1221 | /* | |
e763b90c | 1222 | * We really want to stop the transmitter from sending. |
1da177e4 | 1223 | */ |
e763b90c | 1224 | if (up->port.type == PORT_16C950) { |
1da177e4 LT |
1225 | up->acr |= UART_ACR_TXDIS; |
1226 | serial_icr_write(up, UART_ACR, up->acr); | |
1227 | } | |
1228 | } | |
1229 | ||
55d3b282 RK |
1230 | static void transmit_chars(struct uart_8250_port *up); |
1231 | ||
b129a8cc | 1232 | static void serial8250_start_tx(struct uart_port *port) |
1da177e4 LT |
1233 | { |
1234 | struct uart_8250_port *up = (struct uart_8250_port *)port; | |
1235 | ||
1236 | if (!(up->ier & UART_IER_THRI)) { | |
1237 | up->ier |= UART_IER_THRI; | |
1238 | serial_out(up, UART_IER, up->ier); | |
55d3b282 | 1239 | |
67f7654e | 1240 | if (up->bugs & UART_BUG_TXEN) { |
55d3b282 RK |
1241 | unsigned char lsr, iir; |
1242 | lsr = serial_in(up, UART_LSR); | |
bd71c182 TK |
1243 | iir = serial_in(up, UART_IIR) & 0x0f; |
1244 | if ((up->port.type == PORT_RM9000) ? | |
1245 | (lsr & UART_LSR_THRE && | |
1246 | (iir == UART_IIR_NO_INT || iir == UART_IIR_THRI)) : | |
1247 | (lsr & UART_LSR_TEMT && iir & UART_IIR_NO_INT)) | |
55d3b282 RK |
1248 | transmit_chars(up); |
1249 | } | |
1da177e4 | 1250 | } |
e763b90c | 1251 | |
1da177e4 | 1252 | /* |
e763b90c | 1253 | * Re-enable the transmitter if we disabled it. |
1da177e4 | 1254 | */ |
e763b90c | 1255 | if (up->port.type == PORT_16C950 && up->acr & UART_ACR_TXDIS) { |
1da177e4 LT |
1256 | up->acr &= ~UART_ACR_TXDIS; |
1257 | serial_icr_write(up, UART_ACR, up->acr); | |
1258 | } | |
1259 | } | |
1260 | ||
1261 | static void serial8250_stop_rx(struct uart_port *port) | |
1262 | { | |
1263 | struct uart_8250_port *up = (struct uart_8250_port *)port; | |
1264 | ||
1265 | up->ier &= ~UART_IER_RLSI; | |
1266 | up->port.read_status_mask &= ~UART_LSR_DR; | |
1267 | serial_out(up, UART_IER, up->ier); | |
1268 | } | |
1269 | ||
1270 | static void serial8250_enable_ms(struct uart_port *port) | |
1271 | { | |
1272 | struct uart_8250_port *up = (struct uart_8250_port *)port; | |
1273 | ||
21c614a7 PA |
1274 | /* no MSR capabilities */ |
1275 | if (up->bugs & UART_BUG_NOMSR) | |
1276 | return; | |
1277 | ||
1da177e4 LT |
1278 | up->ier |= UART_IER_MSI; |
1279 | serial_out(up, UART_IER, up->ier); | |
1280 | } | |
1281 | ||
ea8874dc | 1282 | static void |
cc79aa9d | 1283 | receive_chars(struct uart_8250_port *up, unsigned int *status) |
1da177e4 LT |
1284 | { |
1285 | struct tty_struct *tty = up->port.info->tty; | |
1286 | unsigned char ch, lsr = *status; | |
1287 | int max_count = 256; | |
1288 | char flag; | |
1289 | ||
1290 | do { | |
1da177e4 LT |
1291 | ch = serial_inp(up, UART_RX); |
1292 | flag = TTY_NORMAL; | |
1293 | up->port.icount.rx++; | |
1294 | ||
1295 | #ifdef CONFIG_SERIAL_8250_CONSOLE | |
1296 | /* | |
1297 | * Recover the break flag from console xmit | |
1298 | */ | |
1299 | if (up->port.line == up->port.cons->index) { | |
1300 | lsr |= up->lsr_break_flag; | |
1301 | up->lsr_break_flag = 0; | |
1302 | } | |
1303 | #endif | |
1304 | ||
1305 | if (unlikely(lsr & (UART_LSR_BI | UART_LSR_PE | | |
1306 | UART_LSR_FE | UART_LSR_OE))) { | |
1307 | /* | |
1308 | * For statistics only | |
1309 | */ | |
1310 | if (lsr & UART_LSR_BI) { | |
1311 | lsr &= ~(UART_LSR_FE | UART_LSR_PE); | |
1312 | up->port.icount.brk++; | |
1313 | /* | |
1314 | * We do the SysRQ and SAK checking | |
1315 | * here because otherwise the break | |
1316 | * may get masked by ignore_status_mask | |
1317 | * or read_status_mask. | |
1318 | */ | |
1319 | if (uart_handle_break(&up->port)) | |
1320 | goto ignore_char; | |
1321 | } else if (lsr & UART_LSR_PE) | |
1322 | up->port.icount.parity++; | |
1323 | else if (lsr & UART_LSR_FE) | |
1324 | up->port.icount.frame++; | |
1325 | if (lsr & UART_LSR_OE) | |
1326 | up->port.icount.overrun++; | |
1327 | ||
1328 | /* | |
23907eb8 | 1329 | * Mask off conditions which should be ignored. |
1da177e4 LT |
1330 | */ |
1331 | lsr &= up->port.read_status_mask; | |
1332 | ||
1333 | if (lsr & UART_LSR_BI) { | |
1334 | DEBUG_INTR("handling break...."); | |
1335 | flag = TTY_BREAK; | |
1336 | } else if (lsr & UART_LSR_PE) | |
1337 | flag = TTY_PARITY; | |
1338 | else if (lsr & UART_LSR_FE) | |
1339 | flag = TTY_FRAME; | |
1340 | } | |
7d12e780 | 1341 | if (uart_handle_sysrq_char(&up->port, ch)) |
1da177e4 | 1342 | goto ignore_char; |
05ab3014 RK |
1343 | |
1344 | uart_insert_char(&up->port, lsr, UART_LSR_OE, ch, flag); | |
1345 | ||
1da177e4 LT |
1346 | ignore_char: |
1347 | lsr = serial_inp(up, UART_LSR); | |
1348 | } while ((lsr & UART_LSR_DR) && (max_count-- > 0)); | |
1349 | spin_unlock(&up->port.lock); | |
1350 | tty_flip_buffer_push(tty); | |
1351 | spin_lock(&up->port.lock); | |
1352 | *status = lsr; | |
1353 | } | |
1354 | ||
ea8874dc | 1355 | static void transmit_chars(struct uart_8250_port *up) |
1da177e4 LT |
1356 | { |
1357 | struct circ_buf *xmit = &up->port.info->xmit; | |
1358 | int count; | |
1359 | ||
1360 | if (up->port.x_char) { | |
1361 | serial_outp(up, UART_TX, up->port.x_char); | |
1362 | up->port.icount.tx++; | |
1363 | up->port.x_char = 0; | |
1364 | return; | |
1365 | } | |
b129a8cc RK |
1366 | if (uart_tx_stopped(&up->port)) { |
1367 | serial8250_stop_tx(&up->port); | |
1368 | return; | |
1369 | } | |
1370 | if (uart_circ_empty(xmit)) { | |
e763b90c | 1371 | __stop_tx(up); |
1da177e4 LT |
1372 | return; |
1373 | } | |
1374 | ||
1375 | count = up->tx_loadsz; | |
1376 | do { | |
1377 | serial_out(up, UART_TX, xmit->buf[xmit->tail]); | |
1378 | xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); | |
1379 | up->port.icount.tx++; | |
1380 | if (uart_circ_empty(xmit)) | |
1381 | break; | |
1382 | } while (--count > 0); | |
1383 | ||
1384 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) | |
1385 | uart_write_wakeup(&up->port); | |
1386 | ||
1387 | DEBUG_INTR("THRE..."); | |
1388 | ||
1389 | if (uart_circ_empty(xmit)) | |
e763b90c | 1390 | __stop_tx(up); |
1da177e4 LT |
1391 | } |
1392 | ||
2af7cd68 | 1393 | static unsigned int check_modem_status(struct uart_8250_port *up) |
1da177e4 | 1394 | { |
2af7cd68 RK |
1395 | unsigned int status = serial_in(up, UART_MSR); |
1396 | ||
fdc30b3d TI |
1397 | if (status & UART_MSR_ANY_DELTA && up->ier & UART_IER_MSI && |
1398 | up->port.info != NULL) { | |
2af7cd68 RK |
1399 | if (status & UART_MSR_TERI) |
1400 | up->port.icount.rng++; | |
1401 | if (status & UART_MSR_DDSR) | |
1402 | up->port.icount.dsr++; | |
1403 | if (status & UART_MSR_DDCD) | |
1404 | uart_handle_dcd_change(&up->port, status & UART_MSR_DCD); | |
1405 | if (status & UART_MSR_DCTS) | |
1406 | uart_handle_cts_change(&up->port, status & UART_MSR_CTS); | |
1407 | ||
1408 | wake_up_interruptible(&up->port.info->delta_msr_wait); | |
1409 | } | |
1da177e4 | 1410 | |
2af7cd68 | 1411 | return status; |
1da177e4 LT |
1412 | } |
1413 | ||
1414 | /* | |
1415 | * This handles the interrupt from one port. | |
1416 | */ | |
1417 | static inline void | |
7d12e780 | 1418 | serial8250_handle_port(struct uart_8250_port *up) |
1da177e4 | 1419 | { |
45e24601 | 1420 | unsigned int status; |
4bf3631c | 1421 | unsigned long flags; |
45e24601 | 1422 | |
4bf3631c | 1423 | spin_lock_irqsave(&up->port.lock, flags); |
45e24601 RK |
1424 | |
1425 | status = serial_inp(up, UART_LSR); | |
1da177e4 LT |
1426 | |
1427 | DEBUG_INTR("status = %x...", status); | |
1428 | ||
1429 | if (status & UART_LSR_DR) | |
7d12e780 | 1430 | receive_chars(up, &status); |
1da177e4 LT |
1431 | check_modem_status(up); |
1432 | if (status & UART_LSR_THRE) | |
1433 | transmit_chars(up); | |
45e24601 | 1434 | |
4bf3631c | 1435 | spin_unlock_irqrestore(&up->port.lock, flags); |
1da177e4 LT |
1436 | } |
1437 | ||
1438 | /* | |
1439 | * This is the serial driver's interrupt routine. | |
1440 | * | |
1441 | * Arjan thinks the old way was overly complex, so it got simplified. | |
1442 | * Alan disagrees, saying that need the complexity to handle the weird | |
1443 | * nature of ISA shared interrupts. (This is a special exception.) | |
1444 | * | |
1445 | * In order to handle ISA shared interrupts properly, we need to check | |
1446 | * that all ports have been serviced, and therefore the ISA interrupt | |
1447 | * line has been de-asserted. | |
1448 | * | |
1449 | * This means we need to loop through all ports. checking that they | |
1450 | * don't have an interrupt pending. | |
1451 | */ | |
7d12e780 | 1452 | static irqreturn_t serial8250_interrupt(int irq, void *dev_id) |
1da177e4 LT |
1453 | { |
1454 | struct irq_info *i = dev_id; | |
1455 | struct list_head *l, *end = NULL; | |
1456 | int pass_counter = 0, handled = 0; | |
1457 | ||
1458 | DEBUG_INTR("serial8250_interrupt(%d)...", irq); | |
1459 | ||
1460 | spin_lock(&i->lock); | |
1461 | ||
1462 | l = i->head; | |
1463 | do { | |
1464 | struct uart_8250_port *up; | |
1465 | unsigned int iir; | |
1466 | ||
1467 | up = list_entry(l, struct uart_8250_port, list); | |
1468 | ||
1469 | iir = serial_in(up, UART_IIR); | |
1470 | if (!(iir & UART_IIR_NO_INT)) { | |
7d12e780 | 1471 | serial8250_handle_port(up); |
1da177e4 LT |
1472 | |
1473 | handled = 1; | |
1474 | ||
beab697a MSJ |
1475 | end = NULL; |
1476 | } else if (up->port.iotype == UPIO_DWAPB && | |
1477 | (iir & UART_IIR_BUSY) == UART_IIR_BUSY) { | |
1478 | /* The DesignWare APB UART has an Busy Detect (0x07) | |
1479 | * interrupt meaning an LCR write attempt occured while the | |
1480 | * UART was busy. The interrupt must be cleared by reading | |
1481 | * the UART status register (USR) and the LCR re-written. */ | |
1482 | unsigned int status; | |
1483 | status = *(volatile u32 *)up->port.private_data; | |
1484 | serial_out(up, UART_LCR, up->lcr); | |
1485 | ||
1486 | handled = 1; | |
1487 | ||
1da177e4 LT |
1488 | end = NULL; |
1489 | } else if (end == NULL) | |
1490 | end = l; | |
1491 | ||
1492 | l = l->next; | |
1493 | ||
1494 | if (l == i->head && pass_counter++ > PASS_LIMIT) { | |
1495 | /* If we hit this, we're dead. */ | |
1496 | printk(KERN_ERR "serial8250: too much work for " | |
1497 | "irq%d\n", irq); | |
1498 | break; | |
1499 | } | |
1500 | } while (l != end); | |
1501 | ||
1502 | spin_unlock(&i->lock); | |
1503 | ||
1504 | DEBUG_INTR("end.\n"); | |
1505 | ||
1506 | return IRQ_RETVAL(handled); | |
1507 | } | |
1508 | ||
1509 | /* | |
1510 | * To support ISA shared interrupts, we need to have one interrupt | |
1511 | * handler that ensures that the IRQ line has been deasserted | |
1512 | * before returning. Failing to do this will result in the IRQ | |
1513 | * line being stuck active, and, since ISA irqs are edge triggered, | |
1514 | * no more IRQs will be seen. | |
1515 | */ | |
1516 | static void serial_do_unlink(struct irq_info *i, struct uart_8250_port *up) | |
1517 | { | |
1518 | spin_lock_irq(&i->lock); | |
1519 | ||
1520 | if (!list_empty(i->head)) { | |
1521 | if (i->head == &up->list) | |
1522 | i->head = i->head->next; | |
1523 | list_del(&up->list); | |
1524 | } else { | |
1525 | BUG_ON(i->head != &up->list); | |
1526 | i->head = NULL; | |
1527 | } | |
1528 | ||
1529 | spin_unlock_irq(&i->lock); | |
1530 | } | |
1531 | ||
1532 | static int serial_link_irq_chain(struct uart_8250_port *up) | |
1533 | { | |
1534 | struct irq_info *i = irq_lists + up->port.irq; | |
40663cc7 | 1535 | int ret, irq_flags = up->port.flags & UPF_SHARE_IRQ ? IRQF_SHARED : 0; |
1da177e4 LT |
1536 | |
1537 | spin_lock_irq(&i->lock); | |
1538 | ||
1539 | if (i->head) { | |
1540 | list_add(&up->list, i->head); | |
1541 | spin_unlock_irq(&i->lock); | |
1542 | ||
1543 | ret = 0; | |
1544 | } else { | |
1545 | INIT_LIST_HEAD(&up->list); | |
1546 | i->head = &up->list; | |
1547 | spin_unlock_irq(&i->lock); | |
1548 | ||
1549 | ret = request_irq(up->port.irq, serial8250_interrupt, | |
1550 | irq_flags, "serial", i); | |
1551 | if (ret < 0) | |
1552 | serial_do_unlink(i, up); | |
1553 | } | |
1554 | ||
1555 | return ret; | |
1556 | } | |
1557 | ||
1558 | static void serial_unlink_irq_chain(struct uart_8250_port *up) | |
1559 | { | |
1560 | struct irq_info *i = irq_lists + up->port.irq; | |
1561 | ||
1562 | BUG_ON(i->head == NULL); | |
1563 | ||
1564 | if (list_empty(i->head)) | |
1565 | free_irq(up->port.irq, i); | |
1566 | ||
1567 | serial_do_unlink(i, up); | |
1568 | } | |
1569 | ||
40b36daa AW |
1570 | /* Base timer interval for polling */ |
1571 | static inline int poll_timeout(int timeout) | |
1572 | { | |
1573 | return timeout > 6 ? (timeout / 2 - 2) : 1; | |
1574 | } | |
1575 | ||
1da177e4 LT |
1576 | /* |
1577 | * This function is used to handle ports that do not have an | |
1578 | * interrupt. This doesn't work very well for 16450's, but gives | |
1579 | * barely passable results for a 16550A. (Although at the expense | |
1580 | * of much CPU overhead). | |
1581 | */ | |
1582 | static void serial8250_timeout(unsigned long data) | |
1583 | { | |
1584 | struct uart_8250_port *up = (struct uart_8250_port *)data; | |
1da177e4 LT |
1585 | unsigned int iir; |
1586 | ||
1587 | iir = serial_in(up, UART_IIR); | |
45e24601 | 1588 | if (!(iir & UART_IIR_NO_INT)) |
7d12e780 | 1589 | serial8250_handle_port(up); |
40b36daa AW |
1590 | mod_timer(&up->timer, jiffies + poll_timeout(up->port.timeout)); |
1591 | } | |
1592 | ||
1593 | static void serial8250_backup_timeout(unsigned long data) | |
1594 | { | |
1595 | struct uart_8250_port *up = (struct uart_8250_port *)data; | |
1596 | unsigned int iir, ier = 0; | |
1597 | ||
1598 | /* | |
1599 | * Must disable interrupts or else we risk racing with the interrupt | |
1600 | * based handler. | |
1601 | */ | |
1602 | if (is_real_interrupt(up->port.irq)) { | |
1603 | ier = serial_in(up, UART_IER); | |
1604 | serial_out(up, UART_IER, 0); | |
1605 | } | |
1da177e4 | 1606 | |
40b36daa AW |
1607 | iir = serial_in(up, UART_IIR); |
1608 | ||
1609 | /* | |
1610 | * This should be a safe test for anyone who doesn't trust the | |
1611 | * IIR bits on their UART, but it's specifically designed for | |
1612 | * the "Diva" UART used on the management processor on many HP | |
1613 | * ia64 and parisc boxes. | |
1614 | */ | |
1615 | if ((iir & UART_IIR_NO_INT) && (up->ier & UART_IER_THRI) && | |
1616 | (!uart_circ_empty(&up->port.info->xmit) || up->port.x_char) && | |
1617 | (serial_in(up, UART_LSR) & UART_LSR_THRE)) { | |
1618 | iir &= ~(UART_IIR_ID | UART_IIR_NO_INT); | |
1619 | iir |= UART_IIR_THRI; | |
1620 | } | |
1621 | ||
1622 | if (!(iir & UART_IIR_NO_INT)) | |
1623 | serial8250_handle_port(up); | |
1624 | ||
1625 | if (is_real_interrupt(up->port.irq)) | |
1626 | serial_out(up, UART_IER, ier); | |
1627 | ||
1628 | /* Standard timer interval plus 0.2s to keep the port running */ | |
1629 | mod_timer(&up->timer, jiffies + poll_timeout(up->port.timeout) + HZ/5); | |
1da177e4 LT |
1630 | } |
1631 | ||
1632 | static unsigned int serial8250_tx_empty(struct uart_port *port) | |
1633 | { | |
1634 | struct uart_8250_port *up = (struct uart_8250_port *)port; | |
1635 | unsigned long flags; | |
1636 | unsigned int ret; | |
1637 | ||
1638 | spin_lock_irqsave(&up->port.lock, flags); | |
1639 | ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0; | |
1640 | spin_unlock_irqrestore(&up->port.lock, flags); | |
1641 | ||
1642 | return ret; | |
1643 | } | |
1644 | ||
1645 | static unsigned int serial8250_get_mctrl(struct uart_port *port) | |
1646 | { | |
1647 | struct uart_8250_port *up = (struct uart_8250_port *)port; | |
2af7cd68 | 1648 | unsigned int status; |
1da177e4 LT |
1649 | unsigned int ret; |
1650 | ||
2af7cd68 | 1651 | status = check_modem_status(up); |
1da177e4 LT |
1652 | |
1653 | ret = 0; | |
1654 | if (status & UART_MSR_DCD) | |
1655 | ret |= TIOCM_CAR; | |
1656 | if (status & UART_MSR_RI) | |
1657 | ret |= TIOCM_RNG; | |
1658 | if (status & UART_MSR_DSR) | |
1659 | ret |= TIOCM_DSR; | |
1660 | if (status & UART_MSR_CTS) | |
1661 | ret |= TIOCM_CTS; | |
1662 | return ret; | |
1663 | } | |
1664 | ||
1665 | static void serial8250_set_mctrl(struct uart_port *port, unsigned int mctrl) | |
1666 | { | |
1667 | struct uart_8250_port *up = (struct uart_8250_port *)port; | |
1668 | unsigned char mcr = 0; | |
1669 | ||
1670 | if (mctrl & TIOCM_RTS) | |
1671 | mcr |= UART_MCR_RTS; | |
1672 | if (mctrl & TIOCM_DTR) | |
1673 | mcr |= UART_MCR_DTR; | |
1674 | if (mctrl & TIOCM_OUT1) | |
1675 | mcr |= UART_MCR_OUT1; | |
1676 | if (mctrl & TIOCM_OUT2) | |
1677 | mcr |= UART_MCR_OUT2; | |
1678 | if (mctrl & TIOCM_LOOP) | |
1679 | mcr |= UART_MCR_LOOP; | |
1680 | ||
1681 | mcr = (mcr & up->mcr_mask) | up->mcr_force | up->mcr; | |
1682 | ||
1683 | serial_out(up, UART_MCR, mcr); | |
1684 | } | |
1685 | ||
1686 | static void serial8250_break_ctl(struct uart_port *port, int break_state) | |
1687 | { | |
1688 | struct uart_8250_port *up = (struct uart_8250_port *)port; | |
1689 | unsigned long flags; | |
1690 | ||
1691 | spin_lock_irqsave(&up->port.lock, flags); | |
1692 | if (break_state == -1) | |
1693 | up->lcr |= UART_LCR_SBC; | |
1694 | else | |
1695 | up->lcr &= ~UART_LCR_SBC; | |
1696 | serial_out(up, UART_LCR, up->lcr); | |
1697 | spin_unlock_irqrestore(&up->port.lock, flags); | |
1698 | } | |
1699 | ||
40b36daa AW |
1700 | #define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE) |
1701 | ||
1702 | /* | |
1703 | * Wait for transmitter & holding register to empty | |
1704 | */ | |
1705 | static inline void wait_for_xmitr(struct uart_8250_port *up, int bits) | |
1706 | { | |
1707 | unsigned int status, tmout = 10000; | |
1708 | ||
1709 | /* Wait up to 10ms for the character(s) to be sent. */ | |
1710 | do { | |
1711 | status = serial_in(up, UART_LSR); | |
1712 | ||
1713 | if (status & UART_LSR_BI) | |
1714 | up->lsr_break_flag = UART_LSR_BI; | |
1715 | ||
1716 | if (--tmout == 0) | |
1717 | break; | |
1718 | udelay(1); | |
1719 | } while ((status & bits) != bits); | |
1720 | ||
1721 | /* Wait up to 1s for flow control if necessary */ | |
1722 | if (up->port.flags & UPF_CONS_FLOW) { | |
1723 | tmout = 1000000; | |
1724 | while (!(serial_in(up, UART_MSR) & UART_MSR_CTS) && --tmout) { | |
1725 | udelay(1); | |
1726 | touch_nmi_watchdog(); | |
1727 | } | |
1728 | } | |
1729 | } | |
1730 | ||
1da177e4 LT |
1731 | static int serial8250_startup(struct uart_port *port) |
1732 | { | |
1733 | struct uart_8250_port *up = (struct uart_8250_port *)port; | |
1734 | unsigned long flags; | |
55d3b282 | 1735 | unsigned char lsr, iir; |
1da177e4 LT |
1736 | int retval; |
1737 | ||
1738 | up->capabilities = uart_config[up->port.type].flags; | |
1739 | up->mcr = 0; | |
1740 | ||
1741 | if (up->port.type == PORT_16C950) { | |
1742 | /* Wake up and initialize UART */ | |
1743 | up->acr = 0; | |
1744 | serial_outp(up, UART_LCR, 0xBF); | |
1745 | serial_outp(up, UART_EFR, UART_EFR_ECB); | |
1746 | serial_outp(up, UART_IER, 0); | |
1747 | serial_outp(up, UART_LCR, 0); | |
1748 | serial_icr_write(up, UART_CSR, 0); /* Reset the UART */ | |
1749 | serial_outp(up, UART_LCR, 0xBF); | |
1750 | serial_outp(up, UART_EFR, UART_EFR_ECB); | |
1751 | serial_outp(up, UART_LCR, 0); | |
1752 | } | |
1753 | ||
1754 | #ifdef CONFIG_SERIAL_8250_RSA | |
1755 | /* | |
1756 | * If this is an RSA port, see if we can kick it up to the | |
1757 | * higher speed clock. | |
1758 | */ | |
1759 | enable_rsa(up); | |
1760 | #endif | |
1761 | ||
1762 | /* | |
1763 | * Clear the FIFO buffers and disable them. | |
7f927fcc | 1764 | * (they will be reenabled in set_termios()) |
1da177e4 LT |
1765 | */ |
1766 | serial8250_clear_fifos(up); | |
1767 | ||
1768 | /* | |
1769 | * Clear the interrupt registers. | |
1770 | */ | |
1771 | (void) serial_inp(up, UART_LSR); | |
1772 | (void) serial_inp(up, UART_RX); | |
1773 | (void) serial_inp(up, UART_IIR); | |
1774 | (void) serial_inp(up, UART_MSR); | |
1775 | ||
1776 | /* | |
1777 | * At this point, there's no way the LSR could still be 0xff; | |
1778 | * if it is, then bail out, because there's likely no UART | |
1779 | * here. | |
1780 | */ | |
1781 | if (!(up->port.flags & UPF_BUGGY_UART) && | |
1782 | (serial_inp(up, UART_LSR) == 0xff)) { | |
1783 | printk("ttyS%d: LSR safety check engaged!\n", up->port.line); | |
1784 | return -ENODEV; | |
1785 | } | |
1786 | ||
1787 | /* | |
1788 | * For a XR16C850, we need to set the trigger levels | |
1789 | */ | |
1790 | if (up->port.type == PORT_16850) { | |
1791 | unsigned char fctr; | |
1792 | ||
1793 | serial_outp(up, UART_LCR, 0xbf); | |
1794 | ||
1795 | fctr = serial_inp(up, UART_FCTR) & ~(UART_FCTR_RX|UART_FCTR_TX); | |
1796 | serial_outp(up, UART_FCTR, fctr | UART_FCTR_TRGD | UART_FCTR_RX); | |
1797 | serial_outp(up, UART_TRG, UART_TRG_96); | |
1798 | serial_outp(up, UART_FCTR, fctr | UART_FCTR_TRGD | UART_FCTR_TX); | |
1799 | serial_outp(up, UART_TRG, UART_TRG_96); | |
1800 | ||
1801 | serial_outp(up, UART_LCR, 0); | |
1802 | } | |
1803 | ||
40b36daa AW |
1804 | if (is_real_interrupt(up->port.irq)) { |
1805 | /* | |
1806 | * Test for UARTs that do not reassert THRE when the | |
1807 | * transmitter is idle and the interrupt has already | |
1808 | * been cleared. Real 16550s should always reassert | |
1809 | * this interrupt whenever the transmitter is idle and | |
1810 | * the interrupt is enabled. Delays are necessary to | |
1811 | * allow register changes to become visible. | |
1812 | */ | |
1813 | spin_lock_irqsave(&up->port.lock, flags); | |
1814 | ||
1815 | wait_for_xmitr(up, UART_LSR_THRE); | |
1816 | serial_out_sync(up, UART_IER, UART_IER_THRI); | |
1817 | udelay(1); /* allow THRE to set */ | |
1818 | serial_in(up, UART_IIR); | |
1819 | serial_out(up, UART_IER, 0); | |
1820 | serial_out_sync(up, UART_IER, UART_IER_THRI); | |
1821 | udelay(1); /* allow a working UART time to re-assert THRE */ | |
1822 | iir = serial_in(up, UART_IIR); | |
1823 | serial_out(up, UART_IER, 0); | |
1824 | ||
1825 | spin_unlock_irqrestore(&up->port.lock, flags); | |
1826 | ||
1827 | /* | |
1828 | * If the interrupt is not reasserted, setup a timer to | |
1829 | * kick the UART on a regular basis. | |
1830 | */ | |
1831 | if (iir & UART_IIR_NO_INT) { | |
1832 | pr_debug("ttyS%d - using backup timer\n", port->line); | |
1833 | up->timer.function = serial8250_backup_timeout; | |
1834 | up->timer.data = (unsigned long)up; | |
1835 | mod_timer(&up->timer, jiffies + | |
1836 | poll_timeout(up->port.timeout) + HZ/5); | |
1837 | } | |
1838 | } | |
1839 | ||
1da177e4 LT |
1840 | /* |
1841 | * If the "interrupt" for this port doesn't correspond with any | |
1842 | * hardware interrupt, we use a timer-based system. The original | |
1843 | * driver used to do this with IRQ0. | |
1844 | */ | |
1845 | if (!is_real_interrupt(up->port.irq)) { | |
1da177e4 | 1846 | up->timer.data = (unsigned long)up; |
40b36daa | 1847 | mod_timer(&up->timer, jiffies + poll_timeout(up->port.timeout)); |
1da177e4 LT |
1848 | } else { |
1849 | retval = serial_link_irq_chain(up); | |
1850 | if (retval) | |
1851 | return retval; | |
1852 | } | |
1853 | ||
1854 | /* | |
1855 | * Now, initialize the UART | |
1856 | */ | |
1857 | serial_outp(up, UART_LCR, UART_LCR_WLEN8); | |
1858 | ||
1859 | spin_lock_irqsave(&up->port.lock, flags); | |
1860 | if (up->port.flags & UPF_FOURPORT) { | |
1861 | if (!is_real_interrupt(up->port.irq)) | |
1862 | up->port.mctrl |= TIOCM_OUT1; | |
1863 | } else | |
1864 | /* | |
1865 | * Most PC uarts need OUT2 raised to enable interrupts. | |
1866 | */ | |
1867 | if (is_real_interrupt(up->port.irq)) | |
1868 | up->port.mctrl |= TIOCM_OUT2; | |
1869 | ||
1870 | serial8250_set_mctrl(&up->port, up->port.mctrl); | |
55d3b282 RK |
1871 | |
1872 | /* | |
1873 | * Do a quick test to see if we receive an | |
1874 | * interrupt when we enable the TX irq. | |
1875 | */ | |
1876 | serial_outp(up, UART_IER, UART_IER_THRI); | |
1877 | lsr = serial_in(up, UART_LSR); | |
1878 | iir = serial_in(up, UART_IIR); | |
1879 | serial_outp(up, UART_IER, 0); | |
1880 | ||
1881 | if (lsr & UART_LSR_TEMT && iir & UART_IIR_NO_INT) { | |
67f7654e RK |
1882 | if (!(up->bugs & UART_BUG_TXEN)) { |
1883 | up->bugs |= UART_BUG_TXEN; | |
55d3b282 RK |
1884 | pr_debug("ttyS%d - enabling bad tx status workarounds\n", |
1885 | port->line); | |
1886 | } | |
1887 | } else { | |
67f7654e | 1888 | up->bugs &= ~UART_BUG_TXEN; |
55d3b282 RK |
1889 | } |
1890 | ||
1da177e4 LT |
1891 | spin_unlock_irqrestore(&up->port.lock, flags); |
1892 | ||
1893 | /* | |
1894 | * Finally, enable interrupts. Note: Modem status interrupts | |
1895 | * are set via set_termios(), which will be occurring imminently | |
1896 | * anyway, so we don't enable them here. | |
1897 | */ | |
1898 | up->ier = UART_IER_RLSI | UART_IER_RDI; | |
1899 | serial_outp(up, UART_IER, up->ier); | |
1900 | ||
1901 | if (up->port.flags & UPF_FOURPORT) { | |
1902 | unsigned int icp; | |
1903 | /* | |
1904 | * Enable interrupts on the AST Fourport board | |
1905 | */ | |
1906 | icp = (up->port.iobase & 0xfe0) | 0x01f; | |
1907 | outb_p(0x80, icp); | |
1908 | (void) inb_p(icp); | |
1909 | } | |
1910 | ||
1911 | /* | |
1912 | * And clear the interrupt registers again for luck. | |
1913 | */ | |
1914 | (void) serial_inp(up, UART_LSR); | |
1915 | (void) serial_inp(up, UART_RX); | |
1916 | (void) serial_inp(up, UART_IIR); | |
1917 | (void) serial_inp(up, UART_MSR); | |
1918 | ||
1919 | return 0; | |
1920 | } | |
1921 | ||
1922 | static void serial8250_shutdown(struct uart_port *port) | |
1923 | { | |
1924 | struct uart_8250_port *up = (struct uart_8250_port *)port; | |
1925 | unsigned long flags; | |
1926 | ||
1927 | /* | |
1928 | * Disable interrupts from this port | |
1929 | */ | |
1930 | up->ier = 0; | |
1931 | serial_outp(up, UART_IER, 0); | |
1932 | ||
1933 | spin_lock_irqsave(&up->port.lock, flags); | |
1934 | if (up->port.flags & UPF_FOURPORT) { | |
1935 | /* reset interrupts on the AST Fourport board */ | |
1936 | inb((up->port.iobase & 0xfe0) | 0x1f); | |
1937 | up->port.mctrl |= TIOCM_OUT1; | |
1938 | } else | |
1939 | up->port.mctrl &= ~TIOCM_OUT2; | |
1940 | ||
1941 | serial8250_set_mctrl(&up->port, up->port.mctrl); | |
1942 | spin_unlock_irqrestore(&up->port.lock, flags); | |
1943 | ||
1944 | /* | |
1945 | * Disable break condition and FIFOs | |
1946 | */ | |
1947 | serial_out(up, UART_LCR, serial_inp(up, UART_LCR) & ~UART_LCR_SBC); | |
1948 | serial8250_clear_fifos(up); | |
1949 | ||
1950 | #ifdef CONFIG_SERIAL_8250_RSA | |
1951 | /* | |
1952 | * Reset the RSA board back to 115kbps compat mode. | |
1953 | */ | |
1954 | disable_rsa(up); | |
1955 | #endif | |
1956 | ||
1957 | /* | |
1958 | * Read data port to reset things, and then unlink from | |
1959 | * the IRQ chain. | |
1960 | */ | |
1961 | (void) serial_in(up, UART_RX); | |
1962 | ||
40b36daa AW |
1963 | del_timer_sync(&up->timer); |
1964 | up->timer.function = serial8250_timeout; | |
1965 | if (is_real_interrupt(up->port.irq)) | |
1da177e4 LT |
1966 | serial_unlink_irq_chain(up); |
1967 | } | |
1968 | ||
1969 | static unsigned int serial8250_get_divisor(struct uart_port *port, unsigned int baud) | |
1970 | { | |
1971 | unsigned int quot; | |
1972 | ||
1973 | /* | |
1974 | * Handle magic divisors for baud rates above baud_base on | |
1975 | * SMSC SuperIO chips. | |
1976 | */ | |
1977 | if ((port->flags & UPF_MAGIC_MULTIPLIER) && | |
1978 | baud == (port->uartclk/4)) | |
1979 | quot = 0x8001; | |
1980 | else if ((port->flags & UPF_MAGIC_MULTIPLIER) && | |
1981 | baud == (port->uartclk/8)) | |
1982 | quot = 0x8002; | |
1983 | else | |
1984 | quot = uart_get_divisor(port, baud); | |
1985 | ||
1986 | return quot; | |
1987 | } | |
1988 | ||
1989 | static void | |
606d099c AC |
1990 | serial8250_set_termios(struct uart_port *port, struct ktermios *termios, |
1991 | struct ktermios *old) | |
1da177e4 LT |
1992 | { |
1993 | struct uart_8250_port *up = (struct uart_8250_port *)port; | |
1994 | unsigned char cval, fcr = 0; | |
1995 | unsigned long flags; | |
1996 | unsigned int baud, quot; | |
1997 | ||
1998 | switch (termios->c_cflag & CSIZE) { | |
1999 | case CS5: | |
0a8b80c5 | 2000 | cval = UART_LCR_WLEN5; |
1da177e4 LT |
2001 | break; |
2002 | case CS6: | |
0a8b80c5 | 2003 | cval = UART_LCR_WLEN6; |
1da177e4 LT |
2004 | break; |
2005 | case CS7: | |
0a8b80c5 | 2006 | cval = UART_LCR_WLEN7; |
1da177e4 LT |
2007 | break; |
2008 | default: | |
2009 | case CS8: | |
0a8b80c5 | 2010 | cval = UART_LCR_WLEN8; |
1da177e4 LT |
2011 | break; |
2012 | } | |
2013 | ||
2014 | if (termios->c_cflag & CSTOPB) | |
0a8b80c5 | 2015 | cval |= UART_LCR_STOP; |
1da177e4 LT |
2016 | if (termios->c_cflag & PARENB) |
2017 | cval |= UART_LCR_PARITY; | |
2018 | if (!(termios->c_cflag & PARODD)) | |
2019 | cval |= UART_LCR_EPAR; | |
2020 | #ifdef CMSPAR | |
2021 | if (termios->c_cflag & CMSPAR) | |
2022 | cval |= UART_LCR_SPAR; | |
2023 | #endif | |
2024 | ||
2025 | /* | |
2026 | * Ask the core to calculate the divisor for us. | |
2027 | */ | |
bd71c182 | 2028 | baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16); |
1da177e4 LT |
2029 | quot = serial8250_get_divisor(port, baud); |
2030 | ||
2031 | /* | |
4ba5e35d | 2032 | * Oxford Semi 952 rev B workaround |
1da177e4 | 2033 | */ |
4ba5e35d | 2034 | if (up->bugs & UART_BUG_QUOT && (quot & 0xff) == 0) |
1da177e4 LT |
2035 | quot ++; |
2036 | ||
2037 | if (up->capabilities & UART_CAP_FIFO && up->port.fifosize > 1) { | |
2038 | if (baud < 2400) | |
2039 | fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_1; | |
2040 | else | |
2041 | fcr = uart_config[up->port.type].fcr; | |
2042 | } | |
2043 | ||
2044 | /* | |
2045 | * MCR-based auto flow control. When AFE is enabled, RTS will be | |
2046 | * deasserted when the receive FIFO contains more characters than | |
2047 | * the trigger, or the MCR RTS bit is cleared. In the case where | |
2048 | * the remote UART is not using CTS auto flow control, we must | |
2049 | * have sufficient FIFO entries for the latency of the remote | |
2050 | * UART to respond. IOW, at least 32 bytes of FIFO. | |
2051 | */ | |
2052 | if (up->capabilities & UART_CAP_AFE && up->port.fifosize >= 32) { | |
2053 | up->mcr &= ~UART_MCR_AFE; | |
2054 | if (termios->c_cflag & CRTSCTS) | |
2055 | up->mcr |= UART_MCR_AFE; | |
2056 | } | |
2057 | ||
2058 | /* | |
2059 | * Ok, we're now changing the port state. Do it with | |
2060 | * interrupts disabled. | |
2061 | */ | |
2062 | spin_lock_irqsave(&up->port.lock, flags); | |
2063 | ||
2064 | /* | |
2065 | * Update the per-port timeout. | |
2066 | */ | |
2067 | uart_update_timeout(port, termios->c_cflag, baud); | |
2068 | ||
2069 | up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR; | |
2070 | if (termios->c_iflag & INPCK) | |
2071 | up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE; | |
2072 | if (termios->c_iflag & (BRKINT | PARMRK)) | |
2073 | up->port.read_status_mask |= UART_LSR_BI; | |
2074 | ||
2075 | /* | |
2076 | * Characteres to ignore | |
2077 | */ | |
2078 | up->port.ignore_status_mask = 0; | |
2079 | if (termios->c_iflag & IGNPAR) | |
2080 | up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE; | |
2081 | if (termios->c_iflag & IGNBRK) { | |
2082 | up->port.ignore_status_mask |= UART_LSR_BI; | |
2083 | /* | |
2084 | * If we're ignoring parity and break indicators, | |
2085 | * ignore overruns too (for real raw support). | |
2086 | */ | |
2087 | if (termios->c_iflag & IGNPAR) | |
2088 | up->port.ignore_status_mask |= UART_LSR_OE; | |
2089 | } | |
2090 | ||
2091 | /* | |
2092 | * ignore all characters if CREAD is not set | |
2093 | */ | |
2094 | if ((termios->c_cflag & CREAD) == 0) | |
2095 | up->port.ignore_status_mask |= UART_LSR_DR; | |
2096 | ||
2097 | /* | |
2098 | * CTS flow control flag and modem status interrupts | |
2099 | */ | |
2100 | up->ier &= ~UART_IER_MSI; | |
21c614a7 PA |
2101 | if (!(up->bugs & UART_BUG_NOMSR) && |
2102 | UART_ENABLE_MS(&up->port, termios->c_cflag)) | |
1da177e4 LT |
2103 | up->ier |= UART_IER_MSI; |
2104 | if (up->capabilities & UART_CAP_UUE) | |
2105 | up->ier |= UART_IER_UUE | UART_IER_RTOIE; | |
2106 | ||
2107 | serial_out(up, UART_IER, up->ier); | |
2108 | ||
2109 | if (up->capabilities & UART_CAP_EFR) { | |
2110 | unsigned char efr = 0; | |
2111 | /* | |
2112 | * TI16C752/Startech hardware flow control. FIXME: | |
2113 | * - TI16C752 requires control thresholds to be set. | |
2114 | * - UART_MCR_RTS is ineffective if auto-RTS mode is enabled. | |
2115 | */ | |
2116 | if (termios->c_cflag & CRTSCTS) | |
2117 | efr |= UART_EFR_CTS; | |
2118 | ||
2119 | serial_outp(up, UART_LCR, 0xBF); | |
2120 | serial_outp(up, UART_EFR, efr); | |
2121 | } | |
2122 | ||
255341c6 JM |
2123 | #ifdef CONFIG_ARCH_OMAP15XX |
2124 | /* Workaround to enable 115200 baud on OMAP1510 internal ports */ | |
2125 | if (cpu_is_omap1510() && is_omap_port((unsigned int)up->port.membase)) { | |
2126 | if (baud == 115200) { | |
2127 | quot = 1; | |
2128 | serial_out(up, UART_OMAP_OSC_12M_SEL, 1); | |
2129 | } else | |
2130 | serial_out(up, UART_OMAP_OSC_12M_SEL, 0); | |
2131 | } | |
2132 | #endif | |
2133 | ||
1da177e4 LT |
2134 | if (up->capabilities & UART_NATSEMI) { |
2135 | /* Switch to bank 2 not bank 1, to avoid resetting EXCR2 */ | |
2136 | serial_outp(up, UART_LCR, 0xe0); | |
2137 | } else { | |
2138 | serial_outp(up, UART_LCR, cval | UART_LCR_DLAB);/* set DLAB */ | |
2139 | } | |
2140 | ||
b32b19b8 | 2141 | serial_dl_write(up, quot); |
1da177e4 LT |
2142 | |
2143 | /* | |
2144 | * LCR DLAB must be set to enable 64-byte FIFO mode. If the FCR | |
2145 | * is written without DLAB set, this mode will be disabled. | |
2146 | */ | |
2147 | if (up->port.type == PORT_16750) | |
2148 | serial_outp(up, UART_FCR, fcr); | |
2149 | ||
2150 | serial_outp(up, UART_LCR, cval); /* reset DLAB */ | |
2151 | up->lcr = cval; /* Save LCR */ | |
2152 | if (up->port.type != PORT_16750) { | |
2153 | if (fcr & UART_FCR_ENABLE_FIFO) { | |
2154 | /* emulated UARTs (Lucent Venus 167x) need two steps */ | |
2155 | serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO); | |
2156 | } | |
2157 | serial_outp(up, UART_FCR, fcr); /* set fcr */ | |
2158 | } | |
2159 | serial8250_set_mctrl(&up->port, up->port.mctrl); | |
2160 | spin_unlock_irqrestore(&up->port.lock, flags); | |
2161 | } | |
2162 | ||
2163 | static void | |
2164 | serial8250_pm(struct uart_port *port, unsigned int state, | |
2165 | unsigned int oldstate) | |
2166 | { | |
2167 | struct uart_8250_port *p = (struct uart_8250_port *)port; | |
2168 | ||
2169 | serial8250_set_sleep(p, state != 0); | |
2170 | ||
2171 | if (p->pm) | |
2172 | p->pm(port, state, oldstate); | |
2173 | } | |
2174 | ||
2175 | /* | |
2176 | * Resource handling. | |
2177 | */ | |
2178 | static int serial8250_request_std_resource(struct uart_8250_port *up) | |
2179 | { | |
2180 | unsigned int size = 8 << up->port.regshift; | |
2181 | int ret = 0; | |
2182 | ||
2183 | switch (up->port.iotype) { | |
85835f44 SS |
2184 | case UPIO_AU: |
2185 | size = 0x100000; | |
2186 | /* fall thru */ | |
0b30d668 SS |
2187 | case UPIO_TSI: |
2188 | case UPIO_MEM32: | |
1da177e4 | 2189 | case UPIO_MEM: |
beab697a | 2190 | case UPIO_DWAPB: |
1da177e4 LT |
2191 | if (!up->port.mapbase) |
2192 | break; | |
2193 | ||
2194 | if (!request_mem_region(up->port.mapbase, size, "serial")) { | |
2195 | ret = -EBUSY; | |
2196 | break; | |
2197 | } | |
2198 | ||
2199 | if (up->port.flags & UPF_IOREMAP) { | |
2200 | up->port.membase = ioremap(up->port.mapbase, size); | |
2201 | if (!up->port.membase) { | |
2202 | release_mem_region(up->port.mapbase, size); | |
2203 | ret = -ENOMEM; | |
2204 | } | |
2205 | } | |
2206 | break; | |
2207 | ||
2208 | case UPIO_HUB6: | |
2209 | case UPIO_PORT: | |
2210 | if (!request_region(up->port.iobase, size, "serial")) | |
2211 | ret = -EBUSY; | |
2212 | break; | |
2213 | } | |
2214 | return ret; | |
2215 | } | |
2216 | ||
2217 | static void serial8250_release_std_resource(struct uart_8250_port *up) | |
2218 | { | |
2219 | unsigned int size = 8 << up->port.regshift; | |
2220 | ||
2221 | switch (up->port.iotype) { | |
85835f44 SS |
2222 | case UPIO_AU: |
2223 | size = 0x100000; | |
2224 | /* fall thru */ | |
0b30d668 SS |
2225 | case UPIO_TSI: |
2226 | case UPIO_MEM32: | |
1da177e4 | 2227 | case UPIO_MEM: |
beab697a | 2228 | case UPIO_DWAPB: |
1da177e4 LT |
2229 | if (!up->port.mapbase) |
2230 | break; | |
2231 | ||
2232 | if (up->port.flags & UPF_IOREMAP) { | |
2233 | iounmap(up->port.membase); | |
2234 | up->port.membase = NULL; | |
2235 | } | |
2236 | ||
2237 | release_mem_region(up->port.mapbase, size); | |
2238 | break; | |
2239 | ||
2240 | case UPIO_HUB6: | |
2241 | case UPIO_PORT: | |
2242 | release_region(up->port.iobase, size); | |
2243 | break; | |
2244 | } | |
2245 | } | |
2246 | ||
2247 | static int serial8250_request_rsa_resource(struct uart_8250_port *up) | |
2248 | { | |
2249 | unsigned long start = UART_RSA_BASE << up->port.regshift; | |
2250 | unsigned int size = 8 << up->port.regshift; | |
0b30d668 | 2251 | int ret = -EINVAL; |
1da177e4 LT |
2252 | |
2253 | switch (up->port.iotype) { | |
1da177e4 LT |
2254 | case UPIO_HUB6: |
2255 | case UPIO_PORT: | |
2256 | start += up->port.iobase; | |
0b30d668 SS |
2257 | if (request_region(start, size, "serial-rsa")) |
2258 | ret = 0; | |
2259 | else | |
1da177e4 LT |
2260 | ret = -EBUSY; |
2261 | break; | |
2262 | } | |
2263 | ||
2264 | return ret; | |
2265 | } | |
2266 | ||
2267 | static void serial8250_release_rsa_resource(struct uart_8250_port *up) | |
2268 | { | |
2269 | unsigned long offset = UART_RSA_BASE << up->port.regshift; | |
2270 | unsigned int size = 8 << up->port.regshift; | |
2271 | ||
2272 | switch (up->port.iotype) { | |
1da177e4 LT |
2273 | case UPIO_HUB6: |
2274 | case UPIO_PORT: | |
2275 | release_region(up->port.iobase + offset, size); | |
2276 | break; | |
2277 | } | |
2278 | } | |
2279 | ||
2280 | static void serial8250_release_port(struct uart_port *port) | |
2281 | { | |
2282 | struct uart_8250_port *up = (struct uart_8250_port *)port; | |
2283 | ||
2284 | serial8250_release_std_resource(up); | |
2285 | if (up->port.type == PORT_RSA) | |
2286 | serial8250_release_rsa_resource(up); | |
2287 | } | |
2288 | ||
2289 | static int serial8250_request_port(struct uart_port *port) | |
2290 | { | |
2291 | struct uart_8250_port *up = (struct uart_8250_port *)port; | |
2292 | int ret = 0; | |
2293 | ||
2294 | ret = serial8250_request_std_resource(up); | |
2295 | if (ret == 0 && up->port.type == PORT_RSA) { | |
2296 | ret = serial8250_request_rsa_resource(up); | |
2297 | if (ret < 0) | |
2298 | serial8250_release_std_resource(up); | |
2299 | } | |
2300 | ||
2301 | return ret; | |
2302 | } | |
2303 | ||
2304 | static void serial8250_config_port(struct uart_port *port, int flags) | |
2305 | { | |
2306 | struct uart_8250_port *up = (struct uart_8250_port *)port; | |
2307 | int probeflags = PROBE_ANY; | |
2308 | int ret; | |
2309 | ||
1da177e4 LT |
2310 | /* |
2311 | * Find the region that we can probe for. This in turn | |
2312 | * tells us whether we can probe for the type of port. | |
2313 | */ | |
2314 | ret = serial8250_request_std_resource(up); | |
2315 | if (ret < 0) | |
2316 | return; | |
2317 | ||
2318 | ret = serial8250_request_rsa_resource(up); | |
2319 | if (ret < 0) | |
2320 | probeflags &= ~PROBE_RSA; | |
2321 | ||
2322 | if (flags & UART_CONFIG_TYPE) | |
2323 | autoconfig(up, probeflags); | |
2324 | if (up->port.type != PORT_UNKNOWN && flags & UART_CONFIG_IRQ) | |
2325 | autoconfig_irq(up); | |
2326 | ||
2327 | if (up->port.type != PORT_RSA && probeflags & PROBE_RSA) | |
2328 | serial8250_release_rsa_resource(up); | |
2329 | if (up->port.type == PORT_UNKNOWN) | |
2330 | serial8250_release_std_resource(up); | |
2331 | } | |
2332 | ||
2333 | static int | |
2334 | serial8250_verify_port(struct uart_port *port, struct serial_struct *ser) | |
2335 | { | |
2336 | if (ser->irq >= NR_IRQS || ser->irq < 0 || | |
2337 | ser->baud_base < 9600 || ser->type < PORT_UNKNOWN || | |
2338 | ser->type >= ARRAY_SIZE(uart_config) || ser->type == PORT_CIRRUS || | |
2339 | ser->type == PORT_STARTECH) | |
2340 | return -EINVAL; | |
2341 | return 0; | |
2342 | } | |
2343 | ||
2344 | static const char * | |
2345 | serial8250_type(struct uart_port *port) | |
2346 | { | |
2347 | int type = port->type; | |
2348 | ||
2349 | if (type >= ARRAY_SIZE(uart_config)) | |
2350 | type = 0; | |
2351 | return uart_config[type].name; | |
2352 | } | |
2353 | ||
2354 | static struct uart_ops serial8250_pops = { | |
2355 | .tx_empty = serial8250_tx_empty, | |
2356 | .set_mctrl = serial8250_set_mctrl, | |
2357 | .get_mctrl = serial8250_get_mctrl, | |
2358 | .stop_tx = serial8250_stop_tx, | |
2359 | .start_tx = serial8250_start_tx, | |
2360 | .stop_rx = serial8250_stop_rx, | |
2361 | .enable_ms = serial8250_enable_ms, | |
2362 | .break_ctl = serial8250_break_ctl, | |
2363 | .startup = serial8250_startup, | |
2364 | .shutdown = serial8250_shutdown, | |
2365 | .set_termios = serial8250_set_termios, | |
2366 | .pm = serial8250_pm, | |
2367 | .type = serial8250_type, | |
2368 | .release_port = serial8250_release_port, | |
2369 | .request_port = serial8250_request_port, | |
2370 | .config_port = serial8250_config_port, | |
2371 | .verify_port = serial8250_verify_port, | |
2372 | }; | |
2373 | ||
2374 | static struct uart_8250_port serial8250_ports[UART_NR]; | |
2375 | ||
2376 | static void __init serial8250_isa_init_ports(void) | |
2377 | { | |
2378 | struct uart_8250_port *up; | |
2379 | static int first = 1; | |
2380 | int i; | |
2381 | ||
2382 | if (!first) | |
2383 | return; | |
2384 | first = 0; | |
2385 | ||
a61c2d78 | 2386 | for (i = 0; i < nr_uarts; i++) { |
1da177e4 LT |
2387 | struct uart_8250_port *up = &serial8250_ports[i]; |
2388 | ||
2389 | up->port.line = i; | |
2390 | spin_lock_init(&up->port.lock); | |
2391 | ||
2392 | init_timer(&up->timer); | |
2393 | up->timer.function = serial8250_timeout; | |
2394 | ||
2395 | /* | |
2396 | * ALPHA_KLUDGE_MCR needs to be killed. | |
2397 | */ | |
2398 | up->mcr_mask = ~ALPHA_KLUDGE_MCR; | |
2399 | up->mcr_force = ALPHA_KLUDGE_MCR; | |
2400 | ||
2401 | up->port.ops = &serial8250_pops; | |
2402 | } | |
2403 | ||
44454bcd | 2404 | for (i = 0, up = serial8250_ports; |
a61c2d78 | 2405 | i < ARRAY_SIZE(old_serial_port) && i < nr_uarts; |
1da177e4 LT |
2406 | i++, up++) { |
2407 | up->port.iobase = old_serial_port[i].port; | |
2408 | up->port.irq = irq_canonicalize(old_serial_port[i].irq); | |
2409 | up->port.uartclk = old_serial_port[i].baud_base * 16; | |
2410 | up->port.flags = old_serial_port[i].flags; | |
2411 | up->port.hub6 = old_serial_port[i].hub6; | |
2412 | up->port.membase = old_serial_port[i].iomem_base; | |
2413 | up->port.iotype = old_serial_port[i].io_type; | |
2414 | up->port.regshift = old_serial_port[i].iomem_reg_shift; | |
2415 | if (share_irqs) | |
2416 | up->port.flags |= UPF_SHARE_IRQ; | |
2417 | } | |
2418 | } | |
2419 | ||
2420 | static void __init | |
2421 | serial8250_register_ports(struct uart_driver *drv, struct device *dev) | |
2422 | { | |
2423 | int i; | |
2424 | ||
2425 | serial8250_isa_init_ports(); | |
2426 | ||
a61c2d78 | 2427 | for (i = 0; i < nr_uarts; i++) { |
1da177e4 LT |
2428 | struct uart_8250_port *up = &serial8250_ports[i]; |
2429 | ||
2430 | up->port.dev = dev; | |
2431 | uart_add_one_port(drv, &up->port); | |
2432 | } | |
2433 | } | |
2434 | ||
2435 | #ifdef CONFIG_SERIAL_8250_CONSOLE | |
2436 | ||
d358788f RK |
2437 | static void serial8250_console_putchar(struct uart_port *port, int ch) |
2438 | { | |
2439 | struct uart_8250_port *up = (struct uart_8250_port *)port; | |
2440 | ||
2441 | wait_for_xmitr(up, UART_LSR_THRE); | |
2442 | serial_out(up, UART_TX, ch); | |
2443 | } | |
2444 | ||
1da177e4 LT |
2445 | /* |
2446 | * Print a string to the serial port trying not to disturb | |
2447 | * any possible real use of the port... | |
2448 | * | |
2449 | * The console_lock must be held when we get here. | |
2450 | */ | |
2451 | static void | |
2452 | serial8250_console_write(struct console *co, const char *s, unsigned int count) | |
2453 | { | |
2454 | struct uart_8250_port *up = &serial8250_ports[co->index]; | |
d8a5a8d7 | 2455 | unsigned long flags; |
1da177e4 | 2456 | unsigned int ier; |
d8a5a8d7 | 2457 | int locked = 1; |
1da177e4 | 2458 | |
78512ece AM |
2459 | touch_nmi_watchdog(); |
2460 | ||
68aa2c0d AM |
2461 | local_irq_save(flags); |
2462 | if (up->port.sysrq) { | |
2463 | /* serial8250_handle_port() already took the lock */ | |
2464 | locked = 0; | |
2465 | } else if (oops_in_progress) { | |
2466 | locked = spin_trylock(&up->port.lock); | |
d8a5a8d7 | 2467 | } else |
68aa2c0d | 2468 | spin_lock(&up->port.lock); |
d8a5a8d7 | 2469 | |
1da177e4 | 2470 | /* |
dc7bf130 | 2471 | * First save the IER then disable the interrupts |
1da177e4 LT |
2472 | */ |
2473 | ier = serial_in(up, UART_IER); | |
2474 | ||
2475 | if (up->capabilities & UART_CAP_UUE) | |
2476 | serial_out(up, UART_IER, UART_IER_UUE); | |
2477 | else | |
2478 | serial_out(up, UART_IER, 0); | |
2479 | ||
d358788f | 2480 | uart_console_write(&up->port, s, count, serial8250_console_putchar); |
1da177e4 LT |
2481 | |
2482 | /* | |
2483 | * Finally, wait for transmitter to become empty | |
2484 | * and restore the IER | |
2485 | */ | |
f91a3715 | 2486 | wait_for_xmitr(up, BOTH_EMPTY); |
a88d75b2 | 2487 | serial_out(up, UART_IER, ier); |
d8a5a8d7 RK |
2488 | |
2489 | if (locked) | |
68aa2c0d AM |
2490 | spin_unlock(&up->port.lock); |
2491 | local_irq_restore(flags); | |
1da177e4 LT |
2492 | } |
2493 | ||
118c0ace | 2494 | static int __init serial8250_console_setup(struct console *co, char *options) |
1da177e4 LT |
2495 | { |
2496 | struct uart_port *port; | |
2497 | int baud = 9600; | |
2498 | int bits = 8; | |
2499 | int parity = 'n'; | |
2500 | int flow = 'n'; | |
2501 | ||
2502 | /* | |
2503 | * Check whether an invalid uart number has been specified, and | |
2504 | * if so, search for the first available port that does have | |
2505 | * console support. | |
2506 | */ | |
a61c2d78 | 2507 | if (co->index >= nr_uarts) |
1da177e4 LT |
2508 | co->index = 0; |
2509 | port = &serial8250_ports[co->index].port; | |
2510 | if (!port->iobase && !port->membase) | |
2511 | return -ENODEV; | |
2512 | ||
2513 | if (options) | |
2514 | uart_parse_options(options, &baud, &parity, &bits, &flow); | |
2515 | ||
2516 | return uart_set_options(port, co, baud, parity, bits, flow); | |
2517 | } | |
2518 | ||
2519 | static struct uart_driver serial8250_reg; | |
2520 | static struct console serial8250_console = { | |
2521 | .name = "ttyS", | |
2522 | .write = serial8250_console_write, | |
2523 | .device = uart_console_device, | |
2524 | .setup = serial8250_console_setup, | |
2525 | .flags = CON_PRINTBUFFER, | |
2526 | .index = -1, | |
2527 | .data = &serial8250_reg, | |
2528 | }; | |
2529 | ||
2530 | static int __init serial8250_console_init(void) | |
2531 | { | |
2532 | serial8250_isa_init_ports(); | |
2533 | register_console(&serial8250_console); | |
2534 | return 0; | |
2535 | } | |
2536 | console_initcall(serial8250_console_init); | |
2537 | ||
2538 | static int __init find_port(struct uart_port *p) | |
2539 | { | |
2540 | int line; | |
2541 | struct uart_port *port; | |
2542 | ||
a61c2d78 | 2543 | for (line = 0; line < nr_uarts; line++) { |
1da177e4 | 2544 | port = &serial8250_ports[line].port; |
50aec3b5 | 2545 | if (uart_match_port(p, port)) |
1da177e4 LT |
2546 | return line; |
2547 | } | |
2548 | return -ENODEV; | |
2549 | } | |
2550 | ||
2551 | int __init serial8250_start_console(struct uart_port *port, char *options) | |
2552 | { | |
2553 | int line; | |
2554 | ||
2555 | line = find_port(port); | |
2556 | if (line < 0) | |
2557 | return -ENODEV; | |
2558 | ||
2559 | add_preferred_console("ttyS", line, options); | |
2560 | printk("Adding console on ttyS%d at %s 0x%lx (options '%s')\n", | |
2561 | line, port->iotype == UPIO_MEM ? "MMIO" : "I/O port", | |
2562 | port->iotype == UPIO_MEM ? (unsigned long) port->mapbase : | |
2563 | (unsigned long) port->iobase, options); | |
2564 | if (!(serial8250_console.flags & CON_ENABLED)) { | |
2565 | serial8250_console.flags &= ~CON_PRINTBUFFER; | |
2566 | register_console(&serial8250_console); | |
2567 | } | |
2568 | return line; | |
2569 | } | |
2570 | ||
2571 | #define SERIAL8250_CONSOLE &serial8250_console | |
2572 | #else | |
2573 | #define SERIAL8250_CONSOLE NULL | |
2574 | #endif | |
2575 | ||
2576 | static struct uart_driver serial8250_reg = { | |
2577 | .owner = THIS_MODULE, | |
2578 | .driver_name = "serial", | |
1da177e4 LT |
2579 | .dev_name = "ttyS", |
2580 | .major = TTY_MAJOR, | |
2581 | .minor = 64, | |
2582 | .nr = UART_NR, | |
2583 | .cons = SERIAL8250_CONSOLE, | |
2584 | }; | |
2585 | ||
d856c666 RK |
2586 | /* |
2587 | * early_serial_setup - early registration for 8250 ports | |
2588 | * | |
2589 | * Setup an 8250 port structure prior to console initialisation. Use | |
2590 | * after console initialisation will cause undefined behaviour. | |
2591 | */ | |
1da177e4 LT |
2592 | int __init early_serial_setup(struct uart_port *port) |
2593 | { | |
2594 | if (port->line >= ARRAY_SIZE(serial8250_ports)) | |
2595 | return -ENODEV; | |
2596 | ||
2597 | serial8250_isa_init_ports(); | |
2598 | serial8250_ports[port->line].port = *port; | |
2599 | serial8250_ports[port->line].port.ops = &serial8250_pops; | |
2600 | return 0; | |
2601 | } | |
2602 | ||
2603 | /** | |
2604 | * serial8250_suspend_port - suspend one serial port | |
2605 | * @line: serial line number | |
1da177e4 LT |
2606 | * |
2607 | * Suspend one serial port. | |
2608 | */ | |
2609 | void serial8250_suspend_port(int line) | |
2610 | { | |
2611 | uart_suspend_port(&serial8250_reg, &serial8250_ports[line].port); | |
2612 | } | |
2613 | ||
2614 | /** | |
2615 | * serial8250_resume_port - resume one serial port | |
2616 | * @line: serial line number | |
1da177e4 LT |
2617 | * |
2618 | * Resume one serial port. | |
2619 | */ | |
2620 | void serial8250_resume_port(int line) | |
2621 | { | |
2622 | uart_resume_port(&serial8250_reg, &serial8250_ports[line].port); | |
2623 | } | |
2624 | ||
2625 | /* | |
2626 | * Register a set of serial devices attached to a platform device. The | |
2627 | * list is terminated with a zero flags entry, which means we expect | |
2628 | * all entries to have at least UPF_BOOT_AUTOCONF set. | |
2629 | */ | |
3ae5eaec | 2630 | static int __devinit serial8250_probe(struct platform_device *dev) |
1da177e4 | 2631 | { |
3ae5eaec | 2632 | struct plat_serial8250_port *p = dev->dev.platform_data; |
1da177e4 | 2633 | struct uart_port port; |
ec9f47cd | 2634 | int ret, i; |
1da177e4 LT |
2635 | |
2636 | memset(&port, 0, sizeof(struct uart_port)); | |
2637 | ||
ec9f47cd | 2638 | for (i = 0; p && p->flags != 0; p++, i++) { |
1da177e4 LT |
2639 | port.iobase = p->iobase; |
2640 | port.membase = p->membase; | |
2641 | port.irq = p->irq; | |
2642 | port.uartclk = p->uartclk; | |
2643 | port.regshift = p->regshift; | |
2644 | port.iotype = p->iotype; | |
2645 | port.flags = p->flags; | |
2646 | port.mapbase = p->mapbase; | |
ec9f47cd | 2647 | port.hub6 = p->hub6; |
3ae5eaec | 2648 | port.dev = &dev->dev; |
1da177e4 LT |
2649 | if (share_irqs) |
2650 | port.flags |= UPF_SHARE_IRQ; | |
ec9f47cd RK |
2651 | ret = serial8250_register_port(&port); |
2652 | if (ret < 0) { | |
3ae5eaec | 2653 | dev_err(&dev->dev, "unable to register port at index %d " |
ec9f47cd RK |
2654 | "(IO%lx MEM%lx IRQ%d): %d\n", i, |
2655 | p->iobase, p->mapbase, p->irq, ret); | |
2656 | } | |
1da177e4 LT |
2657 | } |
2658 | return 0; | |
2659 | } | |
2660 | ||
2661 | /* | |
2662 | * Remove serial ports registered against a platform device. | |
2663 | */ | |
3ae5eaec | 2664 | static int __devexit serial8250_remove(struct platform_device *dev) |
1da177e4 LT |
2665 | { |
2666 | int i; | |
2667 | ||
a61c2d78 | 2668 | for (i = 0; i < nr_uarts; i++) { |
1da177e4 LT |
2669 | struct uart_8250_port *up = &serial8250_ports[i]; |
2670 | ||
3ae5eaec | 2671 | if (up->port.dev == &dev->dev) |
1da177e4 LT |
2672 | serial8250_unregister_port(i); |
2673 | } | |
2674 | return 0; | |
2675 | } | |
2676 | ||
3ae5eaec | 2677 | static int serial8250_suspend(struct platform_device *dev, pm_message_t state) |
1da177e4 LT |
2678 | { |
2679 | int i; | |
2680 | ||
1da177e4 LT |
2681 | for (i = 0; i < UART_NR; i++) { |
2682 | struct uart_8250_port *up = &serial8250_ports[i]; | |
2683 | ||
3ae5eaec | 2684 | if (up->port.type != PORT_UNKNOWN && up->port.dev == &dev->dev) |
1da177e4 LT |
2685 | uart_suspend_port(&serial8250_reg, &up->port); |
2686 | } | |
2687 | ||
2688 | return 0; | |
2689 | } | |
2690 | ||
3ae5eaec | 2691 | static int serial8250_resume(struct platform_device *dev) |
1da177e4 LT |
2692 | { |
2693 | int i; | |
2694 | ||
1da177e4 LT |
2695 | for (i = 0; i < UART_NR; i++) { |
2696 | struct uart_8250_port *up = &serial8250_ports[i]; | |
2697 | ||
3ae5eaec | 2698 | if (up->port.type != PORT_UNKNOWN && up->port.dev == &dev->dev) |
1da177e4 LT |
2699 | uart_resume_port(&serial8250_reg, &up->port); |
2700 | } | |
2701 | ||
2702 | return 0; | |
2703 | } | |
2704 | ||
3ae5eaec | 2705 | static struct platform_driver serial8250_isa_driver = { |
1da177e4 LT |
2706 | .probe = serial8250_probe, |
2707 | .remove = __devexit_p(serial8250_remove), | |
2708 | .suspend = serial8250_suspend, | |
2709 | .resume = serial8250_resume, | |
3ae5eaec RK |
2710 | .driver = { |
2711 | .name = "serial8250", | |
7493a314 | 2712 | .owner = THIS_MODULE, |
3ae5eaec | 2713 | }, |
1da177e4 LT |
2714 | }; |
2715 | ||
2716 | /* | |
2717 | * This "device" covers _all_ ISA 8250-compatible serial devices listed | |
2718 | * in the table in include/asm/serial.h | |
2719 | */ | |
2720 | static struct platform_device *serial8250_isa_devs; | |
2721 | ||
2722 | /* | |
2723 | * serial8250_register_port and serial8250_unregister_port allows for | |
2724 | * 16x50 serial ports to be configured at run-time, to support PCMCIA | |
2725 | * modems and PCI multiport cards. | |
2726 | */ | |
f392ecfa | 2727 | static DEFINE_MUTEX(serial_mutex); |
1da177e4 LT |
2728 | |
2729 | static struct uart_8250_port *serial8250_find_match_or_unused(struct uart_port *port) | |
2730 | { | |
2731 | int i; | |
2732 | ||
2733 | /* | |
2734 | * First, find a port entry which matches. | |
2735 | */ | |
a61c2d78 | 2736 | for (i = 0; i < nr_uarts; i++) |
1da177e4 LT |
2737 | if (uart_match_port(&serial8250_ports[i].port, port)) |
2738 | return &serial8250_ports[i]; | |
2739 | ||
2740 | /* | |
2741 | * We didn't find a matching entry, so look for the first | |
2742 | * free entry. We look for one which hasn't been previously | |
2743 | * used (indicated by zero iobase). | |
2744 | */ | |
a61c2d78 | 2745 | for (i = 0; i < nr_uarts; i++) |
1da177e4 LT |
2746 | if (serial8250_ports[i].port.type == PORT_UNKNOWN && |
2747 | serial8250_ports[i].port.iobase == 0) | |
2748 | return &serial8250_ports[i]; | |
2749 | ||
2750 | /* | |
2751 | * That also failed. Last resort is to find any entry which | |
2752 | * doesn't have a real port associated with it. | |
2753 | */ | |
a61c2d78 | 2754 | for (i = 0; i < nr_uarts; i++) |
1da177e4 LT |
2755 | if (serial8250_ports[i].port.type == PORT_UNKNOWN) |
2756 | return &serial8250_ports[i]; | |
2757 | ||
2758 | return NULL; | |
2759 | } | |
2760 | ||
2761 | /** | |
2762 | * serial8250_register_port - register a serial port | |
2763 | * @port: serial port template | |
2764 | * | |
2765 | * Configure the serial port specified by the request. If the | |
2766 | * port exists and is in use, it is hung up and unregistered | |
2767 | * first. | |
2768 | * | |
2769 | * The port is then probed and if necessary the IRQ is autodetected | |
2770 | * If this fails an error is returned. | |
2771 | * | |
2772 | * On success the port is ready to use and the line number is returned. | |
2773 | */ | |
2774 | int serial8250_register_port(struct uart_port *port) | |
2775 | { | |
2776 | struct uart_8250_port *uart; | |
2777 | int ret = -ENOSPC; | |
2778 | ||
2779 | if (port->uartclk == 0) | |
2780 | return -EINVAL; | |
2781 | ||
f392ecfa | 2782 | mutex_lock(&serial_mutex); |
1da177e4 LT |
2783 | |
2784 | uart = serial8250_find_match_or_unused(port); | |
2785 | if (uart) { | |
2786 | uart_remove_one_port(&serial8250_reg, &uart->port); | |
2787 | ||
2788 | uart->port.iobase = port->iobase; | |
2789 | uart->port.membase = port->membase; | |
2790 | uart->port.irq = port->irq; | |
2791 | uart->port.uartclk = port->uartclk; | |
2792 | uart->port.fifosize = port->fifosize; | |
2793 | uart->port.regshift = port->regshift; | |
2794 | uart->port.iotype = port->iotype; | |
2795 | uart->port.flags = port->flags | UPF_BOOT_AUTOCONF; | |
2796 | uart->port.mapbase = port->mapbase; | |
2797 | if (port->dev) | |
2798 | uart->port.dev = port->dev; | |
2799 | ||
2800 | ret = uart_add_one_port(&serial8250_reg, &uart->port); | |
2801 | if (ret == 0) | |
2802 | ret = uart->port.line; | |
2803 | } | |
f392ecfa | 2804 | mutex_unlock(&serial_mutex); |
1da177e4 LT |
2805 | |
2806 | return ret; | |
2807 | } | |
2808 | EXPORT_SYMBOL(serial8250_register_port); | |
2809 | ||
2810 | /** | |
2811 | * serial8250_unregister_port - remove a 16x50 serial port at runtime | |
2812 | * @line: serial line number | |
2813 | * | |
2814 | * Remove one serial port. This may not be called from interrupt | |
2815 | * context. We hand the port back to the our control. | |
2816 | */ | |
2817 | void serial8250_unregister_port(int line) | |
2818 | { | |
2819 | struct uart_8250_port *uart = &serial8250_ports[line]; | |
2820 | ||
f392ecfa | 2821 | mutex_lock(&serial_mutex); |
1da177e4 LT |
2822 | uart_remove_one_port(&serial8250_reg, &uart->port); |
2823 | if (serial8250_isa_devs) { | |
2824 | uart->port.flags &= ~UPF_BOOT_AUTOCONF; | |
2825 | uart->port.type = PORT_UNKNOWN; | |
2826 | uart->port.dev = &serial8250_isa_devs->dev; | |
2827 | uart_add_one_port(&serial8250_reg, &uart->port); | |
2828 | } else { | |
2829 | uart->port.dev = NULL; | |
2830 | } | |
f392ecfa | 2831 | mutex_unlock(&serial_mutex); |
1da177e4 LT |
2832 | } |
2833 | EXPORT_SYMBOL(serial8250_unregister_port); | |
2834 | ||
2835 | static int __init serial8250_init(void) | |
2836 | { | |
2837 | int ret, i; | |
2838 | ||
a61c2d78 DJ |
2839 | if (nr_uarts > UART_NR) |
2840 | nr_uarts = UART_NR; | |
2841 | ||
1da177e4 | 2842 | printk(KERN_INFO "Serial: 8250/16550 driver $Revision: 1.90 $ " |
a61c2d78 | 2843 | "%d ports, IRQ sharing %sabled\n", nr_uarts, |
1da177e4 LT |
2844 | share_irqs ? "en" : "dis"); |
2845 | ||
2846 | for (i = 0; i < NR_IRQS; i++) | |
2847 | spin_lock_init(&irq_lists[i].lock); | |
2848 | ||
2849 | ret = uart_register_driver(&serial8250_reg); | |
2850 | if (ret) | |
2851 | goto out; | |
2852 | ||
7493a314 DT |
2853 | serial8250_isa_devs = platform_device_alloc("serial8250", |
2854 | PLAT8250_DEV_LEGACY); | |
2855 | if (!serial8250_isa_devs) { | |
2856 | ret = -ENOMEM; | |
bc965a7f | 2857 | goto unreg_uart_drv; |
1da177e4 LT |
2858 | } |
2859 | ||
7493a314 DT |
2860 | ret = platform_device_add(serial8250_isa_devs); |
2861 | if (ret) | |
2862 | goto put_dev; | |
2863 | ||
1da177e4 LT |
2864 | serial8250_register_ports(&serial8250_reg, &serial8250_isa_devs->dev); |
2865 | ||
bc965a7f RK |
2866 | ret = platform_driver_register(&serial8250_isa_driver); |
2867 | if (ret == 0) | |
2868 | goto out; | |
1da177e4 | 2869 | |
bc965a7f | 2870 | platform_device_del(serial8250_isa_devs); |
7493a314 DT |
2871 | put_dev: |
2872 | platform_device_put(serial8250_isa_devs); | |
7493a314 | 2873 | unreg_uart_drv: |
1da177e4 LT |
2874 | uart_unregister_driver(&serial8250_reg); |
2875 | out: | |
2876 | return ret; | |
2877 | } | |
2878 | ||
2879 | static void __exit serial8250_exit(void) | |
2880 | { | |
2881 | struct platform_device *isa_dev = serial8250_isa_devs; | |
2882 | ||
2883 | /* | |
2884 | * This tells serial8250_unregister_port() not to re-register | |
2885 | * the ports (thereby making serial8250_isa_driver permanently | |
2886 | * in use.) | |
2887 | */ | |
2888 | serial8250_isa_devs = NULL; | |
2889 | ||
3ae5eaec | 2890 | platform_driver_unregister(&serial8250_isa_driver); |
1da177e4 LT |
2891 | platform_device_unregister(isa_dev); |
2892 | ||
2893 | uart_unregister_driver(&serial8250_reg); | |
2894 | } | |
2895 | ||
2896 | module_init(serial8250_init); | |
2897 | module_exit(serial8250_exit); | |
2898 | ||
2899 | EXPORT_SYMBOL(serial8250_suspend_port); | |
2900 | EXPORT_SYMBOL(serial8250_resume_port); | |
2901 | ||
2902 | MODULE_LICENSE("GPL"); | |
2903 | MODULE_DESCRIPTION("Generic 8250/16x50 serial driver $Revision: 1.90 $"); | |
2904 | ||
2905 | module_param(share_irqs, uint, 0644); | |
2906 | MODULE_PARM_DESC(share_irqs, "Share IRQs with other non-8250/16x50 devices" | |
2907 | " (unsafe)"); | |
2908 | ||
a61c2d78 DJ |
2909 | module_param(nr_uarts, uint, 0644); |
2910 | MODULE_PARM_DESC(nr_uarts, "Maximum number of UARTs supported. (1-" __MODULE_STRING(CONFIG_SERIAL_8250_NR_UARTS) ")"); | |
2911 | ||
1da177e4 LT |
2912 | #ifdef CONFIG_SERIAL_8250_RSA |
2913 | module_param_array(probe_rsa, ulong, &probe_rsa_count, 0444); | |
2914 | MODULE_PARM_DESC(probe_rsa, "Probe I/O ports for RSA"); | |
2915 | #endif | |
2916 | MODULE_ALIAS_CHARDEV_MAJOR(TTY_MAJOR); |