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1da177e4 LT |
1 | /* |
2 | * C-Brick Serial Port (and console) driver for SGI Altix machines. | |
3 | * | |
4 | * This driver is NOT suitable for talking to the l1-controller for | |
5 | * anything other than 'console activities' --- please use the l1 | |
6 | * driver for that. | |
7 | * | |
8 | * | |
d171e519 | 9 | * Copyright (c) 2004-2006 Silicon Graphics, Inc. All Rights Reserved. |
1da177e4 | 10 | * |
1da177e4 LT |
11 | * Contact information: Silicon Graphics, Inc., 1500 Crittenden Lane, |
12 | * Mountain View, CA 94043, or: | |
13 | * | |
14 | * http://www.sgi.com | |
15 | * | |
16 | * For further information regarding this notice, see: | |
17 | * | |
18 | * http://oss.sgi.com/projects/GenInfo/NoticeExplan | |
19 | */ | |
20 | ||
1da177e4 LT |
21 | #include <linux/interrupt.h> |
22 | #include <linux/tty.h> | |
ee160a38 | 23 | #include <linux/tty_flip.h> |
1da177e4 LT |
24 | #include <linux/serial.h> |
25 | #include <linux/console.h> | |
4e62794b | 26 | #include <linux/init.h> |
1da177e4 LT |
27 | #include <linux/sysrq.h> |
28 | #include <linux/circ_buf.h> | |
29 | #include <linux/serial_reg.h> | |
30 | #include <linux/delay.h> /* for mdelay */ | |
31 | #include <linux/miscdevice.h> | |
32 | #include <linux/serial_core.h> | |
33 | ||
34 | #include <asm/io.h> | |
35 | #include <asm/sn/simulator.h> | |
36 | #include <asm/sn/sn_sal.h> | |
37 | ||
38 | /* number of characters we can transmit to the SAL console at a time */ | |
39 | #define SN_SAL_MAX_CHARS 120 | |
40 | ||
41 | /* 64K, when we're asynch, it must be at least printk's LOG_BUF_LEN to | |
42 | * avoid losing chars, (always has to be a power of 2) */ | |
43 | #define SN_SAL_BUFFER_SIZE (64 * (1 << 10)) | |
44 | ||
45 | #define SN_SAL_UART_FIFO_DEPTH 16 | |
1f3ccaed | 46 | #define SN_SAL_UART_FIFO_SPEED_CPS (9600/10) |
1da177e4 LT |
47 | |
48 | /* sn_transmit_chars() calling args */ | |
49 | #define TRANSMIT_BUFFERED 0 | |
50 | #define TRANSMIT_RAW 1 | |
51 | ||
52 | /* To use dynamic numbers only and not use the assigned major and minor, | |
53 | * define the following.. */ | |
54 | /* #define USE_DYNAMIC_MINOR 1 *//* use dynamic minor number */ | |
55 | #define USE_DYNAMIC_MINOR 0 /* Don't rely on misc_register dynamic minor */ | |
56 | ||
57 | /* Device name we're using */ | |
58 | #define DEVICE_NAME "ttySG" | |
59 | #define DEVICE_NAME_DYNAMIC "ttySG0" /* need full name for misc_register */ | |
60 | /* The major/minor we are using, ignored for USE_DYNAMIC_MINOR */ | |
61 | #define DEVICE_MAJOR 204 | |
62 | #define DEVICE_MINOR 40 | |
63 | ||
64 | #ifdef CONFIG_MAGIC_SYSRQ | |
65 | static char sysrq_serial_str[] = "\eSYS"; | |
66 | static char *sysrq_serial_ptr = sysrq_serial_str; | |
67 | static unsigned long sysrq_requested; | |
68 | #endif /* CONFIG_MAGIC_SYSRQ */ | |
69 | ||
70 | /* | |
71 | * Port definition - this kinda drives it all | |
72 | */ | |
73 | struct sn_cons_port { | |
74 | struct timer_list sc_timer; | |
75 | struct uart_port sc_port; | |
76 | struct sn_sal_ops { | |
77 | int (*sal_puts_raw) (const char *s, int len); | |
78 | int (*sal_puts) (const char *s, int len); | |
79 | int (*sal_getc) (void); | |
80 | int (*sal_input_pending) (void); | |
81 | void (*sal_wakeup_transmit) (struct sn_cons_port *, int); | |
82 | } *sc_ops; | |
83 | unsigned long sc_interrupt_timeout; | |
84 | int sc_is_asynch; | |
85 | }; | |
86 | ||
87 | static struct sn_cons_port sal_console_port; | |
88 | static int sn_process_input; | |
89 | ||
90 | /* Only used if USE_DYNAMIC_MINOR is set to 1 */ | |
91 | static struct miscdevice misc; /* used with misc_register for dynamic */ | |
92 | ||
93 | extern void early_sn_setup(void); | |
94 | ||
95 | #undef DEBUG | |
96 | #ifdef DEBUG | |
97 | static int sn_debug_printf(const char *fmt, ...); | |
98 | #define DPRINTF(x...) sn_debug_printf(x) | |
99 | #else | |
100 | #define DPRINTF(x...) do { } while (0) | |
101 | #endif | |
102 | ||
103 | /* Prototypes */ | |
104 | static int snt_hw_puts_raw(const char *, int); | |
105 | static int snt_hw_puts_buffered(const char *, int); | |
106 | static int snt_poll_getc(void); | |
107 | static int snt_poll_input_pending(void); | |
108 | static int snt_intr_getc(void); | |
109 | static int snt_intr_input_pending(void); | |
110 | static void sn_transmit_chars(struct sn_cons_port *, int); | |
111 | ||
112 | /* A table for polling: | |
113 | */ | |
114 | static struct sn_sal_ops poll_ops = { | |
115 | .sal_puts_raw = snt_hw_puts_raw, | |
116 | .sal_puts = snt_hw_puts_raw, | |
117 | .sal_getc = snt_poll_getc, | |
118 | .sal_input_pending = snt_poll_input_pending | |
119 | }; | |
120 | ||
121 | /* A table for interrupts enabled */ | |
122 | static struct sn_sal_ops intr_ops = { | |
123 | .sal_puts_raw = snt_hw_puts_raw, | |
124 | .sal_puts = snt_hw_puts_buffered, | |
125 | .sal_getc = snt_intr_getc, | |
126 | .sal_input_pending = snt_intr_input_pending, | |
127 | .sal_wakeup_transmit = sn_transmit_chars | |
128 | }; | |
129 | ||
130 | /* the console does output in two distinctly different ways: | |
25985edc | 131 | * synchronous (raw) and asynchronous (buffered). initially, early_printk |
1da177e4 LT |
132 | * does synchronous output. any data written goes directly to the SAL |
133 | * to be output (incidentally, it is internally buffered by the SAL) | |
134 | * after interrupts and timers are initialized and available for use, | |
135 | * the console init code switches to asynchronous output. this is | |
136 | * also the earliest opportunity to begin polling for console input. | |
137 | * after console initialization, console output and tty (serial port) | |
138 | * output is buffered and sent to the SAL asynchronously (either by | |
139 | * timer callback or by UART interrupt) */ | |
140 | ||
141 | /* routines for running the console in polling mode */ | |
142 | ||
143 | /** | |
144 | * snt_poll_getc - Get a character from the console in polling mode | |
145 | * | |
146 | */ | |
147 | static int snt_poll_getc(void) | |
148 | { | |
149 | int ch; | |
150 | ||
151 | ia64_sn_console_getc(&ch); | |
152 | return ch; | |
153 | } | |
154 | ||
155 | /** | |
156 | * snt_poll_input_pending - Check if any input is waiting - polling mode. | |
157 | * | |
158 | */ | |
159 | static int snt_poll_input_pending(void) | |
160 | { | |
161 | int status, input; | |
162 | ||
163 | status = ia64_sn_console_check(&input); | |
164 | return !status && input; | |
165 | } | |
166 | ||
167 | /* routines for an interrupt driven console (normal) */ | |
168 | ||
169 | /** | |
170 | * snt_intr_getc - Get a character from the console, interrupt mode | |
171 | * | |
172 | */ | |
173 | static int snt_intr_getc(void) | |
174 | { | |
175 | return ia64_sn_console_readc(); | |
176 | } | |
177 | ||
178 | /** | |
179 | * snt_intr_input_pending - Check if input is pending, interrupt mode | |
180 | * | |
181 | */ | |
182 | static int snt_intr_input_pending(void) | |
183 | { | |
184 | return ia64_sn_console_intr_status() & SAL_CONSOLE_INTR_RECV; | |
185 | } | |
186 | ||
187 | /* these functions are polled and interrupt */ | |
188 | ||
189 | /** | |
190 | * snt_hw_puts_raw - Send raw string to the console, polled or interrupt mode | |
191 | * @s: String | |
192 | * @len: Length | |
193 | * | |
194 | */ | |
195 | static int snt_hw_puts_raw(const char *s, int len) | |
196 | { | |
197 | /* this will call the PROM and not return until this is done */ | |
198 | return ia64_sn_console_putb(s, len); | |
199 | } | |
200 | ||
201 | /** | |
202 | * snt_hw_puts_buffered - Send string to console, polled or interrupt mode | |
203 | * @s: String | |
204 | * @len: Length | |
205 | * | |
206 | */ | |
207 | static int snt_hw_puts_buffered(const char *s, int len) | |
208 | { | |
209 | /* queue data to the PROM */ | |
210 | return ia64_sn_console_xmit_chars((char *)s, len); | |
211 | } | |
212 | ||
213 | /* uart interface structs | |
214 | * These functions are associated with the uart_port that the serial core | |
215 | * infrastructure calls. | |
216 | * | |
217 | * Note: Due to how the console works, many routines are no-ops. | |
218 | */ | |
219 | ||
220 | /** | |
221 | * snp_type - What type of console are we? | |
222 | * @port: Port to operate with (we ignore since we only have one port) | |
223 | * | |
224 | */ | |
225 | static const char *snp_type(struct uart_port *port) | |
226 | { | |
227 | return ("SGI SN L1"); | |
228 | } | |
229 | ||
230 | /** | |
231 | * snp_tx_empty - Is the transmitter empty? We pretend we're always empty | |
232 | * @port: Port to operate on (we ignore since we only have one port) | |
233 | * | |
234 | */ | |
235 | static unsigned int snp_tx_empty(struct uart_port *port) | |
236 | { | |
237 | return 1; | |
238 | } | |
239 | ||
240 | /** | |
241 | * snp_stop_tx - stop the transmitter - no-op for us | |
242 | * @port: Port to operat eon - we ignore - no-op function | |
1da177e4 LT |
243 | * |
244 | */ | |
b129a8cc | 245 | static void snp_stop_tx(struct uart_port *port) |
1da177e4 LT |
246 | { |
247 | } | |
248 | ||
249 | /** | |
250 | * snp_release_port - Free i/o and resources for port - no-op for us | |
251 | * @port: Port to operate on - we ignore - no-op function | |
252 | * | |
253 | */ | |
254 | static void snp_release_port(struct uart_port *port) | |
255 | { | |
256 | } | |
257 | ||
1da177e4 LT |
258 | /** |
259 | * snp_shutdown - shut down the port - free irq and disable - no-op for us | |
260 | * @port: Port to shut down - we ignore | |
261 | * | |
262 | */ | |
263 | static void snp_shutdown(struct uart_port *port) | |
264 | { | |
265 | } | |
266 | ||
267 | /** | |
268 | * snp_set_mctrl - set control lines (dtr, rts, etc) - no-op for our console | |
269 | * @port: Port to operate on - we ignore | |
270 | * @mctrl: Lines to set/unset - we ignore | |
271 | * | |
272 | */ | |
273 | static void snp_set_mctrl(struct uart_port *port, unsigned int mctrl) | |
274 | { | |
275 | } | |
276 | ||
277 | /** | |
278 | * snp_get_mctrl - get contorl line info, we just return a static value | |
279 | * @port: port to operate on - we only have one port so we ignore this | |
280 | * | |
281 | */ | |
282 | static unsigned int snp_get_mctrl(struct uart_port *port) | |
283 | { | |
284 | return TIOCM_CAR | TIOCM_RNG | TIOCM_DSR | TIOCM_CTS; | |
285 | } | |
286 | ||
287 | /** | |
288 | * snp_stop_rx - Stop the receiver - we ignor ethis | |
289 | * @port: Port to operate on - we ignore | |
290 | * | |
291 | */ | |
292 | static void snp_stop_rx(struct uart_port *port) | |
293 | { | |
294 | } | |
295 | ||
296 | /** | |
297 | * snp_start_tx - Start transmitter | |
298 | * @port: Port to operate on | |
1da177e4 LT |
299 | * |
300 | */ | |
b129a8cc | 301 | static void snp_start_tx(struct uart_port *port) |
1da177e4 LT |
302 | { |
303 | if (sal_console_port.sc_ops->sal_wakeup_transmit) | |
304 | sal_console_port.sc_ops->sal_wakeup_transmit(&sal_console_port, | |
305 | TRANSMIT_BUFFERED); | |
306 | ||
307 | } | |
308 | ||
309 | /** | |
310 | * snp_break_ctl - handle breaks - ignored by us | |
311 | * @port: Port to operate on | |
312 | * @break_state: Break state | |
313 | * | |
314 | */ | |
315 | static void snp_break_ctl(struct uart_port *port, int break_state) | |
316 | { | |
317 | } | |
318 | ||
319 | /** | |
320 | * snp_startup - Start up the serial port - always return 0 (We're always on) | |
321 | * @port: Port to operate on | |
322 | * | |
323 | */ | |
324 | static int snp_startup(struct uart_port *port) | |
325 | { | |
326 | return 0; | |
327 | } | |
328 | ||
329 | /** | |
330 | * snp_set_termios - set termios stuff - we ignore these | |
331 | * @port: port to operate on | |
332 | * @termios: New settings | |
333 | * @termios: Old | |
334 | * | |
335 | */ | |
336 | static void | |
606d099c AC |
337 | snp_set_termios(struct uart_port *port, struct ktermios *termios, |
338 | struct ktermios *old) | |
1da177e4 LT |
339 | { |
340 | } | |
341 | ||
342 | /** | |
343 | * snp_request_port - allocate resources for port - ignored by us | |
344 | * @port: port to operate on | |
345 | * | |
346 | */ | |
347 | static int snp_request_port(struct uart_port *port) | |
348 | { | |
349 | return 0; | |
350 | } | |
351 | ||
352 | /** | |
353 | * snp_config_port - allocate resources, set up - we ignore, we're always on | |
354 | * @port: Port to operate on | |
355 | * @flags: flags used for port setup | |
356 | * | |
357 | */ | |
358 | static void snp_config_port(struct uart_port *port, int flags) | |
359 | { | |
360 | } | |
361 | ||
362 | /* Associate the uart functions above - given to serial core */ | |
363 | ||
2331e068 | 364 | static const struct uart_ops sn_console_ops = { |
1da177e4 LT |
365 | .tx_empty = snp_tx_empty, |
366 | .set_mctrl = snp_set_mctrl, | |
367 | .get_mctrl = snp_get_mctrl, | |
368 | .stop_tx = snp_stop_tx, | |
369 | .start_tx = snp_start_tx, | |
370 | .stop_rx = snp_stop_rx, | |
1da177e4 LT |
371 | .break_ctl = snp_break_ctl, |
372 | .startup = snp_startup, | |
373 | .shutdown = snp_shutdown, | |
374 | .set_termios = snp_set_termios, | |
375 | .pm = NULL, | |
376 | .type = snp_type, | |
377 | .release_port = snp_release_port, | |
378 | .request_port = snp_request_port, | |
379 | .config_port = snp_config_port, | |
380 | .verify_port = NULL, | |
381 | }; | |
382 | ||
383 | /* End of uart struct functions and defines */ | |
384 | ||
385 | #ifdef DEBUG | |
386 | ||
387 | /** | |
388 | * sn_debug_printf - close to hardware debugging printf | |
389 | * @fmt: printf format | |
390 | * | |
391 | * This is as "close to the metal" as we can get, used when the driver | |
392 | * itself may be broken. | |
393 | * | |
394 | */ | |
395 | static int sn_debug_printf(const char *fmt, ...) | |
396 | { | |
397 | static char printk_buf[1024]; | |
398 | int printed_len; | |
399 | va_list args; | |
400 | ||
401 | va_start(args, fmt); | |
402 | printed_len = vsnprintf(printk_buf, sizeof(printk_buf), fmt, args); | |
403 | ||
404 | if (!sal_console_port.sc_ops) { | |
405 | sal_console_port.sc_ops = &poll_ops; | |
406 | early_sn_setup(); | |
407 | } | |
408 | sal_console_port.sc_ops->sal_puts_raw(printk_buf, printed_len); | |
409 | ||
410 | va_end(args); | |
411 | return printed_len; | |
412 | } | |
413 | #endif /* DEBUG */ | |
414 | ||
415 | /* | |
416 | * Interrupt handling routines. | |
417 | */ | |
418 | ||
419 | /** | |
420 | * sn_receive_chars - Grab characters, pass them to tty layer | |
421 | * @port: Port to operate on | |
1da177e4 LT |
422 | * @flags: irq flags |
423 | * | |
424 | * Note: If we're not registered with the serial core infrastructure yet, | |
425 | * we don't try to send characters to it... | |
426 | * | |
427 | */ | |
428 | static void | |
7d12e780 | 429 | sn_receive_chars(struct sn_cons_port *port, unsigned long flags) |
1da177e4 | 430 | { |
92a19f9c | 431 | struct tty_port *tport = NULL; |
1da177e4 | 432 | int ch; |
1da177e4 LT |
433 | |
434 | if (!port) { | |
90af6d20 | 435 | printk(KERN_ERR "sn_receive_chars - port NULL so can't receive\n"); |
1da177e4 LT |
436 | return; |
437 | } | |
438 | ||
439 | if (!port->sc_ops) { | |
90af6d20 | 440 | printk(KERN_ERR "sn_receive_chars - port->sc_ops NULL so can't receive\n"); |
1da177e4 LT |
441 | return; |
442 | } | |
443 | ||
ebd2c8f6 | 444 | if (port->sc_port.state) { |
421f91d2 | 445 | /* The serial_core stuffs are initialized, use them */ |
92a19f9c | 446 | tport = &port->sc_port.state->port; |
1da177e4 LT |
447 | } |
448 | ||
449 | while (port->sc_ops->sal_input_pending()) { | |
450 | ch = port->sc_ops->sal_getc(); | |
451 | if (ch < 0) { | |
25985edc | 452 | printk(KERN_ERR "sn_console: An error occurred while " |
1da177e4 LT |
453 | "obtaining data from the console (0x%0x)\n", ch); |
454 | break; | |
455 | } | |
456 | #ifdef CONFIG_MAGIC_SYSRQ | |
457 | if (sysrq_requested) { | |
458 | unsigned long sysrq_timeout = sysrq_requested + HZ*5; | |
459 | ||
460 | sysrq_requested = 0; | |
461 | if (ch && time_before(jiffies, sysrq_timeout)) { | |
462 | spin_unlock_irqrestore(&port->sc_port.lock, flags); | |
f335397d | 463 | handle_sysrq(ch); |
1da177e4 LT |
464 | spin_lock_irqsave(&port->sc_port.lock, flags); |
465 | /* ignore actual sysrq command char */ | |
466 | continue; | |
467 | } | |
468 | } | |
469 | if (ch == *sysrq_serial_ptr) { | |
470 | if (!(*++sysrq_serial_ptr)) { | |
471 | sysrq_requested = jiffies; | |
472 | sysrq_serial_ptr = sysrq_serial_str; | |
473 | } | |
474 | /* | |
475 | * ignore the whole sysrq string except for the | |
476 | * leading escape | |
477 | */ | |
478 | if (ch != '\e') | |
479 | continue; | |
480 | } | |
481 | else | |
482 | sysrq_serial_ptr = sysrq_serial_str; | |
483 | #endif /* CONFIG_MAGIC_SYSRQ */ | |
484 | ||
485 | /* record the character to pass up to the tty layer */ | |
2e124b4a | 486 | if (tport) { |
92a19f9c | 487 | if (tty_insert_flip_char(tport, ch, TTY_NORMAL) == 0) |
1da177e4 LT |
488 | break; |
489 | } | |
490 | port->sc_port.icount.rx++; | |
491 | } | |
492 | ||
2e124b4a JS |
493 | if (tport) |
494 | tty_flip_buffer_push(tport); | |
1da177e4 LT |
495 | } |
496 | ||
497 | /** | |
498 | * sn_transmit_chars - grab characters from serial core, send off | |
499 | * @port: Port to operate on | |
500 | * @raw: Transmit raw or buffered | |
501 | * | |
502 | * Note: If we're early, before we're registered with serial core, the | |
503 | * writes are going through sn_sal_console_write because that's how | |
504 | * register_console has been set up. We currently could have asynch | |
505 | * polls calling this function due to sn_sal_switch_to_asynch but we can | |
506 | * ignore them until we register with the serial core stuffs. | |
507 | * | |
508 | */ | |
509 | static void sn_transmit_chars(struct sn_cons_port *port, int raw) | |
510 | { | |
511 | int xmit_count, tail, head, loops, ii; | |
512 | int result; | |
513 | char *start; | |
514 | struct circ_buf *xmit; | |
515 | ||
516 | if (!port) | |
517 | return; | |
518 | ||
519 | BUG_ON(!port->sc_is_asynch); | |
520 | ||
ebd2c8f6 | 521 | if (port->sc_port.state) { |
421f91d2 | 522 | /* We're initialized, using serial core infrastructure */ |
ebd2c8f6 | 523 | xmit = &port->sc_port.state->xmit; |
1da177e4 LT |
524 | } else { |
525 | /* Probably sn_sal_switch_to_asynch has been run but serial core isn't | |
421f91d2 | 526 | * initialized yet. Just return. Writes are going through |
1da177e4 LT |
527 | * sn_sal_console_write (due to register_console) at this time. |
528 | */ | |
529 | return; | |
530 | } | |
531 | ||
532 | if (uart_circ_empty(xmit) || uart_tx_stopped(&port->sc_port)) { | |
533 | /* Nothing to do. */ | |
328007b7 | 534 | ia64_sn_console_intr_disable(SAL_CONSOLE_INTR_XMIT); |
1da177e4 LT |
535 | return; |
536 | } | |
537 | ||
538 | head = xmit->head; | |
539 | tail = xmit->tail; | |
540 | start = &xmit->buf[tail]; | |
541 | ||
542 | /* twice around gets the tail to the end of the buffer and | |
543 | * then to the head, if needed */ | |
544 | loops = (head < tail) ? 2 : 1; | |
545 | ||
546 | for (ii = 0; ii < loops; ii++) { | |
547 | xmit_count = (head < tail) ? | |
548 | (UART_XMIT_SIZE - tail) : (head - tail); | |
549 | ||
550 | if (xmit_count > 0) { | |
551 | if (raw == TRANSMIT_RAW) | |
552 | result = | |
553 | port->sc_ops->sal_puts_raw(start, | |
554 | xmit_count); | |
555 | else | |
556 | result = | |
557 | port->sc_ops->sal_puts(start, xmit_count); | |
558 | #ifdef DEBUG | |
559 | if (!result) | |
560 | DPRINTF("`"); | |
561 | #endif | |
562 | if (result > 0) { | |
563 | xmit_count -= result; | |
564 | port->sc_port.icount.tx += result; | |
565 | tail += result; | |
566 | tail &= UART_XMIT_SIZE - 1; | |
567 | xmit->tail = tail; | |
568 | start = &xmit->buf[tail]; | |
569 | } | |
570 | } | |
571 | } | |
572 | ||
573 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) | |
574 | uart_write_wakeup(&port->sc_port); | |
575 | ||
576 | if (uart_circ_empty(xmit)) | |
b129a8cc | 577 | snp_stop_tx(&port->sc_port); /* no-op for us */ |
1da177e4 LT |
578 | } |
579 | ||
580 | /** | |
581 | * sn_sal_interrupt - Handle console interrupts | |
582 | * @irq: irq #, useful for debug statements | |
583 | * @dev_id: our pointer to our port (sn_cons_port which contains the uart port) | |
1da177e4 LT |
584 | * |
585 | */ | |
7d12e780 | 586 | static irqreturn_t sn_sal_interrupt(int irq, void *dev_id) |
1da177e4 LT |
587 | { |
588 | struct sn_cons_port *port = (struct sn_cons_port *)dev_id; | |
589 | unsigned long flags; | |
590 | int status = ia64_sn_console_intr_status(); | |
591 | ||
592 | if (!port) | |
593 | return IRQ_NONE; | |
594 | ||
595 | spin_lock_irqsave(&port->sc_port.lock, flags); | |
596 | if (status & SAL_CONSOLE_INTR_RECV) { | |
7d12e780 | 597 | sn_receive_chars(port, flags); |
1da177e4 LT |
598 | } |
599 | if (status & SAL_CONSOLE_INTR_XMIT) { | |
600 | sn_transmit_chars(port, TRANSMIT_BUFFERED); | |
601 | } | |
602 | spin_unlock_irqrestore(&port->sc_port.lock, flags); | |
603 | return IRQ_HANDLED; | |
604 | } | |
605 | ||
1da177e4 LT |
606 | /** |
607 | * sn_sal_timer_poll - this function handles polled console mode | |
608 | * @data: A pointer to our sn_cons_port (which contains the uart port) | |
609 | * | |
610 | * data is the pointer that init_timer will store for us. This function is | |
611 | * associated with init_timer to see if there is any console traffic. | |
612 | * Obviously not used in interrupt mode | |
613 | * | |
614 | */ | |
e99e88a9 | 615 | static void sn_sal_timer_poll(struct timer_list *t) |
1da177e4 | 616 | { |
e99e88a9 | 617 | struct sn_cons_port *port = from_timer(port, t, sc_timer); |
1da177e4 LT |
618 | unsigned long flags; |
619 | ||
620 | if (!port) | |
621 | return; | |
622 | ||
623 | if (!port->sc_port.irq) { | |
624 | spin_lock_irqsave(&port->sc_port.lock, flags); | |
625 | if (sn_process_input) | |
8c1addbc | 626 | sn_receive_chars(port, flags); |
1da177e4 LT |
627 | sn_transmit_chars(port, TRANSMIT_RAW); |
628 | spin_unlock_irqrestore(&port->sc_port.lock, flags); | |
629 | mod_timer(&port->sc_timer, | |
630 | jiffies + port->sc_interrupt_timeout); | |
631 | } | |
632 | } | |
633 | ||
634 | /* | |
635 | * Boot-time initialization code | |
636 | */ | |
637 | ||
638 | /** | |
639 | * sn_sal_switch_to_asynch - Switch to async mode (as opposed to synch) | |
640 | * @port: Our sn_cons_port (which contains the uart port) | |
641 | * | |
642 | * So this is used by sn_sal_serial_console_init (early on, before we're | |
4e62794b | 643 | * registered with serial core). It's also used by sn_sal_init |
1da177e4 LT |
644 | * right after we've registered with serial core. The later only happens |
645 | * if we didn't already come through here via sn_sal_serial_console_init. | |
646 | * | |
647 | */ | |
648 | static void __init sn_sal_switch_to_asynch(struct sn_cons_port *port) | |
649 | { | |
650 | unsigned long flags; | |
651 | ||
652 | if (!port) | |
653 | return; | |
654 | ||
655 | DPRINTF("sn_console: about to switch to asynchronous console\n"); | |
656 | ||
657 | /* without early_printk, we may be invoked late enough to race | |
658 | * with other cpus doing console IO at this point, however | |
659 | * console interrupts will never be enabled */ | |
660 | spin_lock_irqsave(&port->sc_port.lock, flags); | |
661 | ||
662 | /* early_printk invocation may have done this for us */ | |
663 | if (!port->sc_ops) | |
664 | port->sc_ops = &poll_ops; | |
665 | ||
666 | /* we can't turn on the console interrupt (as request_irq | |
667 | * calls kmalloc, which isn't set up yet), so we rely on a | |
668 | * timer to poll for input and push data from the console | |
669 | * buffer. | |
670 | */ | |
e99e88a9 | 671 | timer_setup(&port->sc_timer, sn_sal_timer_poll, 0); |
1da177e4 LT |
672 | |
673 | if (IS_RUNNING_ON_SIMULATOR()) | |
674 | port->sc_interrupt_timeout = 6; | |
675 | else { | |
676 | /* 960cps / 16 char FIFO = 60HZ | |
677 | * HZ / (SN_SAL_FIFO_SPEED_CPS / SN_SAL_FIFO_DEPTH) */ | |
678 | port->sc_interrupt_timeout = | |
679 | HZ * SN_SAL_UART_FIFO_DEPTH / SN_SAL_UART_FIFO_SPEED_CPS; | |
680 | } | |
681 | mod_timer(&port->sc_timer, jiffies + port->sc_interrupt_timeout); | |
682 | ||
683 | port->sc_is_asynch = 1; | |
684 | spin_unlock_irqrestore(&port->sc_port.lock, flags); | |
685 | } | |
686 | ||
687 | /** | |
688 | * sn_sal_switch_to_interrupts - Switch to interrupt driven mode | |
689 | * @port: Our sn_cons_port (which contains the uart port) | |
690 | * | |
4e62794b | 691 | * In sn_sal_init, after we're registered with serial core and |
1da177e4 LT |
692 | * the port is added, this function is called to switch us to interrupt |
693 | * mode. We were previously in asynch/polling mode (using init_timer). | |
694 | * | |
695 | * We attempt to switch to interrupt mode here by calling | |
f70c81d4 | 696 | * request_irq. If that works out, we enable receive interrupts. |
1da177e4 LT |
697 | */ |
698 | static void __init sn_sal_switch_to_interrupts(struct sn_cons_port *port) | |
699 | { | |
1da177e4 LT |
700 | unsigned long flags; |
701 | ||
f70c81d4 PG |
702 | if (port) { |
703 | DPRINTF("sn_console: switching to interrupt driven console\n"); | |
1da177e4 | 704 | |
f70c81d4 | 705 | if (request_irq(SGI_UART_VECTOR, sn_sal_interrupt, |
9cfb5c05 | 706 | IRQF_SHARED, |
f70c81d4 PG |
707 | "SAL console driver", port) >= 0) { |
708 | spin_lock_irqsave(&port->sc_port.lock, flags); | |
709 | port->sc_port.irq = SGI_UART_VECTOR; | |
710 | port->sc_ops = &intr_ops; | |
48e30fa0 | 711 | irq_set_handler(port->sc_port.irq, handle_level_irq); |
1da177e4 | 712 | |
f70c81d4 PG |
713 | /* turn on receive interrupts */ |
714 | ia64_sn_console_intr_enable(SAL_CONSOLE_INTR_RECV); | |
715 | spin_unlock_irqrestore(&port->sc_port.lock, flags); | |
716 | } | |
717 | else { | |
718 | printk(KERN_INFO | |
719 | "sn_console: console proceeding in polled mode\n"); | |
720 | } | |
1da177e4 | 721 | } |
1da177e4 LT |
722 | } |
723 | ||
724 | /* | |
725 | * Kernel console definitions | |
726 | */ | |
727 | ||
728 | static void sn_sal_console_write(struct console *, const char *, unsigned); | |
17e0c7cc | 729 | static int sn_sal_console_setup(struct console *, char *); |
434498d5 | 730 | static struct uart_driver sal_console_uart; |
1da177e4 LT |
731 | extern struct tty_driver *uart_console_device(struct console *, int *); |
732 | ||
733 | static struct console sal_console = { | |
734 | .name = DEVICE_NAME, | |
735 | .write = sn_sal_console_write, | |
736 | .device = uart_console_device, | |
737 | .setup = sn_sal_console_setup, | |
738 | .index = -1, /* unspecified */ | |
739 | .data = &sal_console_uart, | |
740 | }; | |
741 | ||
742 | #define SAL_CONSOLE &sal_console | |
743 | ||
434498d5 | 744 | static struct uart_driver sal_console_uart = { |
1da177e4 LT |
745 | .owner = THIS_MODULE, |
746 | .driver_name = "sn_console", | |
747 | .dev_name = DEVICE_NAME, | |
748 | .major = 0, /* major/minor set at registration time per USE_DYNAMIC_MINOR */ | |
749 | .minor = 0, | |
750 | .nr = 1, /* one port */ | |
751 | .cons = SAL_CONSOLE, | |
752 | }; | |
753 | ||
754 | /** | |
4e62794b | 755 | * sn_sal_init - When the kernel loads us, get us rolling w/ serial core |
1da177e4 LT |
756 | * |
757 | * Before this is called, we've been printing kernel messages in a special | |
758 | * early mode not making use of the serial core infrastructure. When our | |
759 | * driver is loaded for real, we register the driver and port with serial | |
760 | * core and try to enable interrupt driven mode. | |
761 | * | |
762 | */ | |
4e62794b | 763 | static int __init sn_sal_init(void) |
1da177e4 LT |
764 | { |
765 | int retval; | |
766 | ||
767 | if (!ia64_platform_is("sn2")) | |
f032f908 | 768 | return 0; |
1da177e4 LT |
769 | |
770 | printk(KERN_INFO "sn_console: Console driver init\n"); | |
771 | ||
772 | if (USE_DYNAMIC_MINOR == 1) { | |
773 | misc.minor = MISC_DYNAMIC_MINOR; | |
774 | misc.name = DEVICE_NAME_DYNAMIC; | |
775 | retval = misc_register(&misc); | |
776 | if (retval != 0) { | |
d171e519 JS |
777 | printk(KERN_WARNING "Failed to register console " |
778 | "device using misc_register.\n"); | |
1da177e4 LT |
779 | return -ENODEV; |
780 | } | |
781 | sal_console_uart.major = MISC_MAJOR; | |
782 | sal_console_uart.minor = misc.minor; | |
783 | } else { | |
784 | sal_console_uart.major = DEVICE_MAJOR; | |
785 | sal_console_uart.minor = DEVICE_MINOR; | |
786 | } | |
787 | ||
788 | /* We register the driver and the port before switching to interrupts | |
789 | * or async above so the proper uart structures are populated */ | |
790 | ||
791 | if (uart_register_driver(&sal_console_uart) < 0) { | |
792 | printk | |
4e62794b | 793 | ("ERROR sn_sal_init failed uart_register_driver, line %d\n", |
1da177e4 LT |
794 | __LINE__); |
795 | return -ENODEV; | |
796 | } | |
797 | ||
798 | spin_lock_init(&sal_console_port.sc_port.lock); | |
799 | ||
800 | /* Setup the port struct with the minimum needed */ | |
801 | sal_console_port.sc_port.membase = (char *)1; /* just needs to be non-zero */ | |
802 | sal_console_port.sc_port.type = PORT_16550A; | |
803 | sal_console_port.sc_port.fifosize = SN_SAL_MAX_CHARS; | |
804 | sal_console_port.sc_port.ops = &sn_console_ops; | |
805 | sal_console_port.sc_port.line = 0; | |
806 | ||
807 | if (uart_add_one_port(&sal_console_uart, &sal_console_port.sc_port) < 0) { | |
808 | /* error - not sure what I'd do - so I'll do nothing */ | |
71cc2c21 | 809 | printk(KERN_ERR "%s: unable to add port\n", __func__); |
1da177e4 LT |
810 | } |
811 | ||
812 | /* when this driver is compiled in, the console initialization | |
813 | * will have already switched us into asynchronous operation | |
4e62794b | 814 | * before we get here through the initcalls */ |
1da177e4 LT |
815 | if (!sal_console_port.sc_is_asynch) { |
816 | sn_sal_switch_to_asynch(&sal_console_port); | |
817 | } | |
818 | ||
4e62794b | 819 | /* at this point (device_init) we can try to turn on interrupts */ |
1da177e4 LT |
820 | if (!IS_RUNNING_ON_SIMULATOR()) { |
821 | sn_sal_switch_to_interrupts(&sal_console_port); | |
822 | } | |
823 | sn_process_input = 1; | |
824 | return 0; | |
825 | } | |
4e62794b | 826 | device_initcall(sn_sal_init); |
1da177e4 LT |
827 | |
828 | /** | |
829 | * puts_raw_fixed - sn_sal_console_write helper for adding \r's as required | |
830 | * @puts_raw : puts function to do the writing | |
831 | * @s: input string | |
832 | * @count: length | |
833 | * | |
834 | * We need a \r ahead of every \n for direct writes through | |
835 | * ia64_sn_console_putb (what sal_puts_raw below actually does). | |
836 | * | |
837 | */ | |
838 | ||
839 | static void puts_raw_fixed(int (*puts_raw) (const char *s, int len), | |
840 | const char *s, int count) | |
841 | { | |
842 | const char *s1; | |
843 | ||
844 | /* Output '\r' before each '\n' */ | |
845 | while ((s1 = memchr(s, '\n', count)) != NULL) { | |
846 | puts_raw(s, s1 - s); | |
847 | puts_raw("\r\n", 2); | |
848 | count -= s1 + 1 - s; | |
849 | s = s1 + 1; | |
850 | } | |
851 | puts_raw(s, count); | |
852 | } | |
853 | ||
854 | /** | |
855 | * sn_sal_console_write - Print statements before serial core available | |
856 | * @console: Console to operate on - we ignore since we have just one | |
857 | * @s: String to send | |
858 | * @count: length | |
859 | * | |
860 | * This is referenced in the console struct. It is used for early | |
861 | * console printing before we register with serial core and for things | |
862 | * such as kdb. The console_lock must be held when we get here. | |
863 | * | |
864 | * This function has some code for trying to print output even if the lock | |
865 | * is held. We try to cover the case where a lock holder could have died. | |
866 | * We don't use this special case code if we're not registered with serial | |
867 | * core yet. After we're registered with serial core, the only time this | |
868 | * function would be used is for high level kernel output like magic sys req, | |
869 | * kdb, and printk's. | |
870 | */ | |
871 | static void | |
872 | sn_sal_console_write(struct console *co, const char *s, unsigned count) | |
873 | { | |
874 | unsigned long flags = 0; | |
875 | struct sn_cons_port *port = &sal_console_port; | |
1da177e4 | 876 | static int stole_lock = 0; |
1da177e4 LT |
877 | |
878 | BUG_ON(!port->sc_is_asynch); | |
879 | ||
880 | /* We can't look at the xmit buffer if we're not registered with serial core | |
881 | * yet. So only do the fancy recovery after registering | |
882 | */ | |
ebd2c8f6 | 883 | if (!port->sc_port.state) { |
d171e519 JS |
884 | /* Not yet registered with serial core - simple case */ |
885 | puts_raw_fixed(port->sc_ops->sal_puts_raw, s, count); | |
886 | return; | |
887 | } | |
1da177e4 | 888 | |
d171e519 JS |
889 | /* somebody really wants this output, might be an |
890 | * oops, kdb, panic, etc. make sure they get it. */ | |
891 | if (spin_is_locked(&port->sc_port.lock)) { | |
ebd2c8f6 AC |
892 | int lhead = port->sc_port.state->xmit.head; |
893 | int ltail = port->sc_port.state->xmit.tail; | |
d171e519 JS |
894 | int counter, got_lock = 0; |
895 | ||
896 | /* | |
897 | * We attempt to determine if someone has died with the | |
898 | * lock. We wait ~20 secs after the head and tail ptrs | |
899 | * stop moving and assume the lock holder is not functional | |
900 | * and plow ahead. If the lock is freed within the time out | |
901 | * period we re-get the lock and go ahead normally. We also | |
902 | * remember if we have plowed ahead so that we don't have | |
903 | * to wait out the time out period again - the asumption | |
904 | * is that we will time out again. | |
905 | */ | |
1da177e4 | 906 | |
d171e519 JS |
907 | for (counter = 0; counter < 150; mdelay(125), counter++) { |
908 | if (!spin_is_locked(&port->sc_port.lock) | |
909 | || stole_lock) { | |
910 | if (!stole_lock) { | |
911 | spin_lock_irqsave(&port->sc_port.lock, | |
912 | flags); | |
913 | got_lock = 1; | |
1da177e4 | 914 | } |
d171e519 | 915 | break; |
1da177e4 | 916 | } else { |
d171e519 | 917 | /* still locked */ |
ebd2c8f6 | 918 | if ((lhead != port->sc_port.state->xmit.head) |
d171e519 | 919 | || (ltail != |
ebd2c8f6 | 920 | port->sc_port.state->xmit.tail)) { |
d171e519 | 921 | lhead = |
ebd2c8f6 | 922 | port->sc_port.state->xmit.head; |
d171e519 | 923 | ltail = |
ebd2c8f6 | 924 | port->sc_port.state->xmit.tail; |
d171e519 JS |
925 | counter = 0; |
926 | } | |
1da177e4 | 927 | } |
d171e519 JS |
928 | } |
929 | /* flush anything in the serial core xmit buffer, raw */ | |
930 | sn_transmit_chars(port, 1); | |
931 | if (got_lock) { | |
1da177e4 | 932 | spin_unlock_irqrestore(&port->sc_port.lock, flags); |
d171e519 JS |
933 | stole_lock = 0; |
934 | } else { | |
935 | /* fell thru */ | |
936 | stole_lock = 1; | |
1da177e4 | 937 | } |
d171e519 JS |
938 | puts_raw_fixed(port->sc_ops->sal_puts_raw, s, count); |
939 | } else { | |
940 | stole_lock = 0; | |
941 | spin_lock_irqsave(&port->sc_port.lock, flags); | |
942 | sn_transmit_chars(port, 1); | |
943 | spin_unlock_irqrestore(&port->sc_port.lock, flags); | |
944 | ||
1da177e4 LT |
945 | puts_raw_fixed(port->sc_ops->sal_puts_raw, s, count); |
946 | } | |
947 | } | |
948 | ||
949 | ||
950 | /** | |
951 | * sn_sal_console_setup - Set up console for early printing | |
952 | * @co: Console to work with | |
953 | * @options: Options to set | |
954 | * | |
955 | * Altix console doesn't do anything with baud rates, etc, anyway. | |
956 | * | |
957 | * This isn't required since not providing the setup function in the | |
958 | * console struct is ok. However, other patches like KDB plop something | |
959 | * here so providing it is easier. | |
960 | * | |
961 | */ | |
17e0c7cc | 962 | static int sn_sal_console_setup(struct console *co, char *options) |
1da177e4 LT |
963 | { |
964 | return 0; | |
965 | } | |
966 | ||
967 | /** | |
968 | * sn_sal_console_write_early - simple early output routine | |
969 | * @co - console struct | |
970 | * @s - string to print | |
971 | * @count - count | |
972 | * | |
973 | * Simple function to provide early output, before even | |
974 | * sn_sal_serial_console_init is called. Referenced in the | |
975 | * console struct registerd in sn_serial_console_early_setup. | |
976 | * | |
977 | */ | |
978 | static void __init | |
979 | sn_sal_console_write_early(struct console *co, const char *s, unsigned count) | |
980 | { | |
981 | puts_raw_fixed(sal_console_port.sc_ops->sal_puts_raw, s, count); | |
982 | } | |
983 | ||
984 | /* Used for very early console printing - again, before | |
985 | * sn_sal_serial_console_init is run */ | |
986 | static struct console sal_console_early __initdata = { | |
987 | .name = "sn_sal", | |
988 | .write = sn_sal_console_write_early, | |
989 | .flags = CON_PRINTBUFFER, | |
990 | .index = -1, | |
991 | }; | |
992 | ||
993 | /** | |
994 | * sn_serial_console_early_setup - Sets up early console output support | |
995 | * | |
996 | * Register a console early on... This is for output before even | |
997 | * sn_sal_serial_cosnole_init is called. This function is called from | |
998 | * setup.c. This allows us to do really early polled writes. When | |
999 | * sn_sal_serial_console_init is called, this console is unregistered | |
1000 | * and a new one registered. | |
1001 | */ | |
1002 | int __init sn_serial_console_early_setup(void) | |
1003 | { | |
1004 | if (!ia64_platform_is("sn2")) | |
1005 | return -1; | |
1006 | ||
1007 | sal_console_port.sc_ops = &poll_ops; | |
71841b8f | 1008 | spin_lock_init(&sal_console_port.sc_port.lock); |
1da177e4 LT |
1009 | early_sn_setup(); /* Find SAL entry points */ |
1010 | register_console(&sal_console_early); | |
1011 | ||
1012 | return 0; | |
1013 | } | |
1014 | ||
1015 | /** | |
1016 | * sn_sal_serial_console_init - Early console output - set up for register | |
1017 | * | |
1018 | * This function is called when regular console init happens. Because we | |
1019 | * support even earlier console output with sn_serial_console_early_setup | |
1020 | * (called from setup.c directly), this function unregisters the really | |
1021 | * early console. | |
1022 | * | |
1023 | * Note: Even if setup.c doesn't register sal_console_early, unregistering | |
1024 | * it here doesn't hurt anything. | |
1025 | * | |
1026 | */ | |
1027 | static int __init sn_sal_serial_console_init(void) | |
1028 | { | |
1029 | if (ia64_platform_is("sn2")) { | |
1030 | sn_sal_switch_to_asynch(&sal_console_port); | |
1031 | DPRINTF("sn_sal_serial_console_init : register console\n"); | |
1032 | register_console(&sal_console); | |
1033 | unregister_console(&sal_console_early); | |
1034 | } | |
1035 | return 0; | |
1036 | } | |
1037 | ||
1038 | console_initcall(sn_sal_serial_console_init); |