Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * | |
3 | * Procedures for interfacing to the RTAS on CHRP machines. | |
4 | * | |
5 | * Peter Bergner, IBM March 2001. | |
6 | * Copyright (C) 2001 IBM. | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU General Public License | |
10 | * as published by the Free Software Foundation; either version | |
11 | * 2 of the License, or (at your option) any later version. | |
12 | */ | |
13 | ||
14 | #include <stdarg.h> | |
15 | #include <linux/kernel.h> | |
16 | #include <linux/types.h> | |
17 | #include <linux/spinlock.h> | |
18 | #include <linux/module.h> | |
19 | #include <linux/init.h> | |
a9415644 | 20 | #include <linux/capability.h> |
21fe3301 | 21 | #include <linux/delay.h> |
8f5c7579 NL |
22 | #include <linux/smp.h> |
23 | #include <linux/completion.h> | |
24 | #include <linux/cpumask.h> | |
1da177e4 LT |
25 | |
26 | #include <asm/prom.h> | |
27 | #include <asm/rtas.h> | |
31a7f67e | 28 | #include <asm/hvcall.h> |
1da177e4 LT |
29 | #include <asm/semaphore.h> |
30 | #include <asm/machdep.h> | |
e8222502 | 31 | #include <asm/firmware.h> |
1da177e4 LT |
32 | #include <asm/page.h> |
33 | #include <asm/param.h> | |
34 | #include <asm/system.h> | |
1da177e4 LT |
35 | #include <asm/delay.h> |
36 | #include <asm/uaccess.h> | |
033ef338 | 37 | #include <asm/lmb.h> |
296167ae | 38 | #include <asm/udbg.h> |
a7f31841 | 39 | #include <asm/syscalls.h> |
8f5c7579 NL |
40 | #include <asm/smp.h> |
41 | #include <asm/atomic.h> | |
1da177e4 | 42 | |
033ef338 | 43 | struct rtas_t rtas = { |
1da177e4 LT |
44 | .lock = SPIN_LOCK_UNLOCKED |
45 | }; | |
ab3ab74d | 46 | EXPORT_SYMBOL(rtas); |
1da177e4 | 47 | |
91dc182c | 48 | struct rtas_suspend_me_data { |
8f5c7579 NL |
49 | atomic_t working; /* number of cpus accessing this struct */ |
50 | int token; /* ibm,suspend-me */ | |
51 | int error; | |
52 | struct completion *complete; /* wait on this until working == 0 */ | |
91dc182c DB |
53 | }; |
54 | ||
1da177e4 | 55 | DEFINE_SPINLOCK(rtas_data_buf_lock); |
ab3ab74d ME |
56 | EXPORT_SYMBOL(rtas_data_buf_lock); |
57 | ||
033ef338 | 58 | char rtas_data_buf[RTAS_DATA_BUF_SIZE] __cacheline_aligned; |
ab3ab74d ME |
59 | EXPORT_SYMBOL(rtas_data_buf); |
60 | ||
1da177e4 LT |
61 | unsigned long rtas_rmo_buf; |
62 | ||
f4fcbbe9 PM |
63 | /* |
64 | * If non-NULL, this gets called when the kernel terminates. | |
65 | * This is done like this so rtas_flash can be a module. | |
66 | */ | |
67 | void (*rtas_flash_term_hook)(int); | |
68 | EXPORT_SYMBOL(rtas_flash_term_hook); | |
69 | ||
033ef338 PM |
70 | /* |
71 | * call_rtas_display_status and call_rtas_display_status_delay | |
72 | * are designed only for very early low-level debugging, which | |
73 | * is why the token is hard-coded to 10. | |
74 | */ | |
296167ae | 75 | static void call_rtas_display_status(char c) |
1da177e4 LT |
76 | { |
77 | struct rtas_args *args = &rtas.args; | |
78 | unsigned long s; | |
79 | ||
80 | if (!rtas.base) | |
81 | return; | |
82 | spin_lock_irqsave(&rtas.lock, s); | |
83 | ||
84 | args->token = 10; | |
85 | args->nargs = 1; | |
86 | args->nret = 1; | |
87 | args->rets = (rtas_arg_t *)&(args->args[1]); | |
296167ae | 88 | args->args[0] = (unsigned char)c; |
1da177e4 LT |
89 | |
90 | enter_rtas(__pa(args)); | |
91 | ||
92 | spin_unlock_irqrestore(&rtas.lock, s); | |
93 | } | |
94 | ||
296167ae | 95 | static void call_rtas_display_status_delay(char c) |
1da177e4 LT |
96 | { |
97 | static int pending_newline = 0; /* did last write end with unprinted newline? */ | |
98 | static int width = 16; | |
99 | ||
100 | if (c == '\n') { | |
101 | while (width-- > 0) | |
102 | call_rtas_display_status(' '); | |
103 | width = 16; | |
21fe3301 | 104 | mdelay(500); |
1da177e4 LT |
105 | pending_newline = 1; |
106 | } else { | |
107 | if (pending_newline) { | |
108 | call_rtas_display_status('\r'); | |
109 | call_rtas_display_status('\n'); | |
110 | } | |
111 | pending_newline = 0; | |
112 | if (width--) { | |
113 | call_rtas_display_status(c); | |
114 | udelay(10000); | |
115 | } | |
116 | } | |
117 | } | |
118 | ||
cc46bb98 | 119 | void __init udbg_init_rtas_panel(void) |
296167ae ME |
120 | { |
121 | udbg_putc = call_rtas_display_status_delay; | |
122 | } | |
123 | ||
cc46bb98 ME |
124 | #ifdef CONFIG_UDBG_RTAS_CONSOLE |
125 | ||
126 | /* If you think you're dying before early_init_dt_scan_rtas() does its | |
127 | * work, you can hard code the token values for your firmware here and | |
128 | * hardcode rtas.base/entry etc. | |
129 | */ | |
130 | static unsigned int rtas_putchar_token = RTAS_UNKNOWN_SERVICE; | |
131 | static unsigned int rtas_getchar_token = RTAS_UNKNOWN_SERVICE; | |
132 | ||
133 | static void udbg_rtascon_putc(char c) | |
134 | { | |
135 | int tries; | |
136 | ||
137 | if (!rtas.base) | |
138 | return; | |
139 | ||
140 | /* Add CRs before LFs */ | |
141 | if (c == '\n') | |
142 | udbg_rtascon_putc('\r'); | |
143 | ||
144 | /* if there is more than one character to be displayed, wait a bit */ | |
145 | for (tries = 0; tries < 16; tries++) { | |
146 | if (rtas_call(rtas_putchar_token, 1, 1, NULL, c) == 0) | |
147 | break; | |
148 | udelay(1000); | |
149 | } | |
150 | } | |
151 | ||
152 | static int udbg_rtascon_getc_poll(void) | |
153 | { | |
154 | int c; | |
155 | ||
156 | if (!rtas.base) | |
157 | return -1; | |
158 | ||
159 | if (rtas_call(rtas_getchar_token, 0, 2, &c)) | |
160 | return -1; | |
161 | ||
162 | return c; | |
163 | } | |
164 | ||
165 | static int udbg_rtascon_getc(void) | |
166 | { | |
167 | int c; | |
168 | ||
169 | while ((c = udbg_rtascon_getc_poll()) == -1) | |
170 | ; | |
171 | ||
172 | return c; | |
173 | } | |
174 | ||
175 | ||
176 | void __init udbg_init_rtas_console(void) | |
177 | { | |
178 | udbg_putc = udbg_rtascon_putc; | |
179 | udbg_getc = udbg_rtascon_getc; | |
180 | udbg_getc_poll = udbg_rtascon_getc_poll; | |
181 | } | |
182 | #endif /* CONFIG_UDBG_RTAS_CONSOLE */ | |
183 | ||
033ef338 | 184 | void rtas_progress(char *s, unsigned short hex) |
6566c6f1 AB |
185 | { |
186 | struct device_node *root; | |
a7f67bdf JK |
187 | int width; |
188 | const int *p; | |
6566c6f1 AB |
189 | char *os; |
190 | static int display_character, set_indicator; | |
a7f67bdf | 191 | static int display_width, display_lines, form_feed; |
c5a69d57 | 192 | static const int *row_width; |
6566c6f1 | 193 | static DEFINE_SPINLOCK(progress_lock); |
8f586b22 | 194 | static int current_line; |
6566c6f1 AB |
195 | static int pending_newline = 0; /* did last write end with unprinted newline? */ |
196 | ||
197 | if (!rtas.base) | |
198 | return; | |
199 | ||
8f586b22 MS |
200 | if (display_width == 0) { |
201 | display_width = 0x10; | |
8c8dc322 | 202 | if ((root = of_find_node_by_path("/rtas"))) { |
e2eb6392 | 203 | if ((p = of_get_property(root, |
8f586b22 MS |
204 | "ibm,display-line-length", NULL))) |
205 | display_width = *p; | |
e2eb6392 | 206 | if ((p = of_get_property(root, |
8f586b22 MS |
207 | "ibm,form-feed", NULL))) |
208 | form_feed = *p; | |
e2eb6392 | 209 | if ((p = of_get_property(root, |
8f586b22 MS |
210 | "ibm,display-number-of-lines", NULL))) |
211 | display_lines = *p; | |
e2eb6392 | 212 | row_width = of_get_property(root, |
8f586b22 | 213 | "ibm,display-truncation-length", NULL); |
8c8dc322 | 214 | of_node_put(root); |
8f586b22 | 215 | } |
6566c6f1 AB |
216 | display_character = rtas_token("display-character"); |
217 | set_indicator = rtas_token("set-indicator"); | |
218 | } | |
219 | ||
220 | if (display_character == RTAS_UNKNOWN_SERVICE) { | |
221 | /* use hex display if available */ | |
222 | if (set_indicator != RTAS_UNKNOWN_SERVICE) | |
223 | rtas_call(set_indicator, 3, 1, NULL, 6, 0, hex); | |
224 | return; | |
225 | } | |
226 | ||
227 | spin_lock(&progress_lock); | |
228 | ||
229 | /* | |
230 | * Last write ended with newline, but we didn't print it since | |
231 | * it would just clear the bottom line of output. Print it now | |
232 | * instead. | |
233 | * | |
8f586b22 MS |
234 | * If no newline is pending and form feed is supported, clear the |
235 | * display with a form feed; otherwise, print a CR to start output | |
236 | * at the beginning of the line. | |
6566c6f1 AB |
237 | */ |
238 | if (pending_newline) { | |
239 | rtas_call(display_character, 1, 1, NULL, '\r'); | |
240 | rtas_call(display_character, 1, 1, NULL, '\n'); | |
241 | pending_newline = 0; | |
242 | } else { | |
8f586b22 MS |
243 | current_line = 0; |
244 | if (form_feed) | |
245 | rtas_call(display_character, 1, 1, NULL, | |
246 | (char)form_feed); | |
247 | else | |
248 | rtas_call(display_character, 1, 1, NULL, '\r'); | |
6566c6f1 AB |
249 | } |
250 | ||
8f586b22 MS |
251 | if (row_width) |
252 | width = row_width[current_line]; | |
253 | else | |
254 | width = display_width; | |
6566c6f1 AB |
255 | os = s; |
256 | while (*os) { | |
257 | if (*os == '\n' || *os == '\r') { | |
6566c6f1 AB |
258 | /* If newline is the last character, save it |
259 | * until next call to avoid bumping up the | |
260 | * display output. | |
261 | */ | |
262 | if (*os == '\n' && !os[1]) { | |
263 | pending_newline = 1; | |
8f586b22 MS |
264 | current_line++; |
265 | if (current_line > display_lines-1) | |
266 | current_line = display_lines-1; | |
6566c6f1 AB |
267 | spin_unlock(&progress_lock); |
268 | return; | |
269 | } | |
270 | ||
271 | /* RTAS wants CR-LF, not just LF */ | |
272 | ||
273 | if (*os == '\n') { | |
274 | rtas_call(display_character, 1, 1, NULL, '\r'); | |
275 | rtas_call(display_character, 1, 1, NULL, '\n'); | |
276 | } else { | |
277 | /* CR might be used to re-draw a line, so we'll | |
278 | * leave it alone and not add LF. | |
279 | */ | |
280 | rtas_call(display_character, 1, 1, NULL, *os); | |
281 | } | |
282 | ||
8f586b22 MS |
283 | if (row_width) |
284 | width = row_width[current_line]; | |
285 | else | |
286 | width = display_width; | |
6566c6f1 AB |
287 | } else { |
288 | width--; | |
289 | rtas_call(display_character, 1, 1, NULL, *os); | |
290 | } | |
291 | ||
292 | os++; | |
293 | ||
294 | /* if we overwrite the screen length */ | |
295 | if (width <= 0) | |
296 | while ((*os != 0) && (*os != '\n') && (*os != '\r')) | |
297 | os++; | |
298 | } | |
299 | ||
6566c6f1 AB |
300 | spin_unlock(&progress_lock); |
301 | } | |
f4fcbbe9 | 302 | EXPORT_SYMBOL(rtas_progress); /* needed by rtas_flash module */ |
6566c6f1 | 303 | |
033ef338 | 304 | int rtas_token(const char *service) |
1da177e4 | 305 | { |
a7f67bdf | 306 | const int *tokp; |
033ef338 | 307 | if (rtas.dev == NULL) |
1da177e4 | 308 | return RTAS_UNKNOWN_SERVICE; |
e2eb6392 | 309 | tokp = of_get_property(rtas.dev, service, NULL); |
1da177e4 LT |
310 | return tokp ? *tokp : RTAS_UNKNOWN_SERVICE; |
311 | } | |
ab3ab74d | 312 | EXPORT_SYMBOL(rtas_token); |
1da177e4 | 313 | |
f2d6d2d8 NL |
314 | int rtas_service_present(const char *service) |
315 | { | |
316 | return rtas_token(service) != RTAS_UNKNOWN_SERVICE; | |
317 | } | |
318 | EXPORT_SYMBOL(rtas_service_present); | |
319 | ||
033ef338 | 320 | #ifdef CONFIG_RTAS_ERROR_LOGGING |
1da177e4 LT |
321 | /* |
322 | * Return the firmware-specified size of the error log buffer | |
323 | * for all rtas calls that require an error buffer argument. | |
324 | * This includes 'check-exception' and 'rtas-last-error'. | |
325 | */ | |
326 | int rtas_get_error_log_max(void) | |
327 | { | |
328 | static int rtas_error_log_max; | |
329 | if (rtas_error_log_max) | |
330 | return rtas_error_log_max; | |
331 | ||
332 | rtas_error_log_max = rtas_token ("rtas-error-log-max"); | |
333 | if ((rtas_error_log_max == RTAS_UNKNOWN_SERVICE) || | |
334 | (rtas_error_log_max > RTAS_ERROR_LOG_MAX)) { | |
033ef338 PM |
335 | printk (KERN_WARNING "RTAS: bad log buffer size %d\n", |
336 | rtas_error_log_max); | |
1da177e4 LT |
337 | rtas_error_log_max = RTAS_ERROR_LOG_MAX; |
338 | } | |
339 | return rtas_error_log_max; | |
340 | } | |
033ef338 | 341 | EXPORT_SYMBOL(rtas_get_error_log_max); |
1da177e4 LT |
342 | |
343 | ||
033ef338 PM |
344 | char rtas_err_buf[RTAS_ERROR_LOG_MAX]; |
345 | int rtas_last_error_token; | |
346 | ||
1da177e4 LT |
347 | /** Return a copy of the detailed error text associated with the |
348 | * most recent failed call to rtas. Because the error text | |
349 | * might go stale if there are any other intervening rtas calls, | |
350 | * this routine must be called atomically with whatever produced | |
351 | * the error (i.e. with rtas.lock still held from the previous call). | |
352 | */ | |
033ef338 | 353 | static char *__fetch_rtas_last_error(char *altbuf) |
1da177e4 LT |
354 | { |
355 | struct rtas_args err_args, save_args; | |
356 | u32 bufsz; | |
033ef338 PM |
357 | char *buf = NULL; |
358 | ||
359 | if (rtas_last_error_token == -1) | |
360 | return NULL; | |
1da177e4 LT |
361 | |
362 | bufsz = rtas_get_error_log_max(); | |
363 | ||
033ef338 | 364 | err_args.token = rtas_last_error_token; |
1da177e4 LT |
365 | err_args.nargs = 2; |
366 | err_args.nret = 1; | |
1da177e4 LT |
367 | err_args.args[0] = (rtas_arg_t)__pa(rtas_err_buf); |
368 | err_args.args[1] = bufsz; | |
369 | err_args.args[2] = 0; | |
370 | ||
371 | save_args = rtas.args; | |
372 | rtas.args = err_args; | |
373 | ||
374 | enter_rtas(__pa(&rtas.args)); | |
375 | ||
376 | err_args = rtas.args; | |
377 | rtas.args = save_args; | |
378 | ||
033ef338 PM |
379 | /* Log the error in the unlikely case that there was one. */ |
380 | if (unlikely(err_args.args[2] == 0)) { | |
381 | if (altbuf) { | |
382 | buf = altbuf; | |
383 | } else { | |
384 | buf = rtas_err_buf; | |
385 | if (mem_init_done) | |
386 | buf = kmalloc(RTAS_ERROR_LOG_MAX, GFP_ATOMIC); | |
387 | } | |
388 | if (buf) | |
389 | memcpy(buf, rtas_err_buf, RTAS_ERROR_LOG_MAX); | |
390 | } | |
391 | ||
392 | return buf; | |
1da177e4 LT |
393 | } |
394 | ||
033ef338 PM |
395 | #define get_errorlog_buffer() kmalloc(RTAS_ERROR_LOG_MAX, GFP_KERNEL) |
396 | ||
397 | #else /* CONFIG_RTAS_ERROR_LOGGING */ | |
398 | #define __fetch_rtas_last_error(x) NULL | |
399 | #define get_errorlog_buffer() NULL | |
400 | #endif | |
401 | ||
1da177e4 LT |
402 | int rtas_call(int token, int nargs, int nret, int *outputs, ...) |
403 | { | |
404 | va_list list; | |
033ef338 | 405 | int i; |
1da177e4 LT |
406 | unsigned long s; |
407 | struct rtas_args *rtas_args; | |
033ef338 | 408 | char *buff_copy = NULL; |
1da177e4 LT |
409 | int ret; |
410 | ||
24da3dd5 | 411 | if (!rtas.entry || token == RTAS_UNKNOWN_SERVICE) |
1da177e4 LT |
412 | return -1; |
413 | ||
414 | /* Gotta do something different here, use global lock for now... */ | |
415 | spin_lock_irqsave(&rtas.lock, s); | |
416 | rtas_args = &rtas.args; | |
417 | ||
418 | rtas_args->token = token; | |
419 | rtas_args->nargs = nargs; | |
420 | rtas_args->nret = nret; | |
421 | rtas_args->rets = (rtas_arg_t *)&(rtas_args->args[nargs]); | |
422 | va_start(list, outputs); | |
033ef338 | 423 | for (i = 0; i < nargs; ++i) |
1da177e4 | 424 | rtas_args->args[i] = va_arg(list, rtas_arg_t); |
1da177e4 LT |
425 | va_end(list); |
426 | ||
427 | for (i = 0; i < nret; ++i) | |
428 | rtas_args->rets[i] = 0; | |
429 | ||
1da177e4 | 430 | enter_rtas(__pa(rtas_args)); |
1da177e4 LT |
431 | |
432 | /* A -1 return code indicates that the last command couldn't | |
433 | be completed due to a hardware error. */ | |
434 | if (rtas_args->rets[0] == -1) | |
033ef338 | 435 | buff_copy = __fetch_rtas_last_error(NULL); |
1da177e4 LT |
436 | |
437 | if (nret > 1 && outputs != NULL) | |
438 | for (i = 0; i < nret-1; ++i) | |
439 | outputs[i] = rtas_args->rets[i+1]; | |
440 | ret = (nret > 0)? rtas_args->rets[0]: 0; | |
441 | ||
1da177e4 LT |
442 | /* Gotta do something different here, use global lock for now... */ |
443 | spin_unlock_irqrestore(&rtas.lock, s); | |
444 | ||
445 | if (buff_copy) { | |
446 | log_error(buff_copy, ERR_TYPE_RTAS_LOG, 0); | |
447 | if (mem_init_done) | |
448 | kfree(buff_copy); | |
449 | } | |
450 | return ret; | |
451 | } | |
ab3ab74d | 452 | EXPORT_SYMBOL(rtas_call); |
1da177e4 | 453 | |
507279db JR |
454 | /* For RTAS_BUSY (-2), delay for 1 millisecond. For an extended busy status |
455 | * code of 990n, perform the hinted delay of 10^n (last digit) milliseconds. | |
1da177e4 | 456 | */ |
507279db | 457 | unsigned int rtas_busy_delay_time(int status) |
1da177e4 | 458 | { |
507279db JR |
459 | int order; |
460 | unsigned int ms = 0; | |
461 | ||
462 | if (status == RTAS_BUSY) { | |
463 | ms = 1; | |
464 | } else if (status >= 9900 && status <= 9905) { | |
465 | order = status - 9900; | |
466 | for (ms = 1; order > 0; order--) | |
467 | ms *= 10; | |
468 | } | |
1da177e4 | 469 | |
507279db JR |
470 | return ms; |
471 | } | |
ab3ab74d | 472 | EXPORT_SYMBOL(rtas_busy_delay_time); |
1da177e4 | 473 | |
507279db JR |
474 | /* For an RTAS busy status code, perform the hinted delay. */ |
475 | unsigned int rtas_busy_delay(int status) | |
476 | { | |
477 | unsigned int ms; | |
1da177e4 | 478 | |
507279db JR |
479 | might_sleep(); |
480 | ms = rtas_busy_delay_time(status); | |
481 | if (ms) | |
482 | msleep(ms); | |
483 | ||
484 | return ms; | |
1da177e4 | 485 | } |
ab3ab74d | 486 | EXPORT_SYMBOL(rtas_busy_delay); |
1da177e4 LT |
487 | |
488 | int rtas_error_rc(int rtas_rc) | |
489 | { | |
490 | int rc; | |
491 | ||
492 | switch (rtas_rc) { | |
493 | case -1: /* Hardware Error */ | |
494 | rc = -EIO; | |
495 | break; | |
496 | case -3: /* Bad indicator/domain/etc */ | |
497 | rc = -EINVAL; | |
498 | break; | |
499 | case -9000: /* Isolation error */ | |
500 | rc = -EFAULT; | |
501 | break; | |
502 | case -9001: /* Outstanding TCE/PTE */ | |
503 | rc = -EEXIST; | |
504 | break; | |
505 | case -9002: /* No usable slot */ | |
506 | rc = -ENODEV; | |
507 | break; | |
508 | default: | |
509 | printk(KERN_ERR "%s: unexpected RTAS error %d\n", | |
510 | __FUNCTION__, rtas_rc); | |
511 | rc = -ERANGE; | |
512 | break; | |
513 | } | |
514 | return rc; | |
515 | } | |
516 | ||
517 | int rtas_get_power_level(int powerdomain, int *level) | |
518 | { | |
519 | int token = rtas_token("get-power-level"); | |
520 | int rc; | |
521 | ||
522 | if (token == RTAS_UNKNOWN_SERVICE) | |
523 | return -ENOENT; | |
524 | ||
525 | while ((rc = rtas_call(token, 1, 2, level, powerdomain)) == RTAS_BUSY) | |
526 | udelay(1); | |
527 | ||
528 | if (rc < 0) | |
529 | return rtas_error_rc(rc); | |
530 | return rc; | |
531 | } | |
ab3ab74d | 532 | EXPORT_SYMBOL(rtas_get_power_level); |
1da177e4 LT |
533 | |
534 | int rtas_set_power_level(int powerdomain, int level, int *setlevel) | |
535 | { | |
536 | int token = rtas_token("set-power-level"); | |
1da177e4 LT |
537 | int rc; |
538 | ||
539 | if (token == RTAS_UNKNOWN_SERVICE) | |
540 | return -ENOENT; | |
541 | ||
507279db | 542 | do { |
1da177e4 | 543 | rc = rtas_call(token, 2, 2, setlevel, powerdomain, level); |
507279db | 544 | } while (rtas_busy_delay(rc)); |
1da177e4 LT |
545 | |
546 | if (rc < 0) | |
547 | return rtas_error_rc(rc); | |
548 | return rc; | |
549 | } | |
ab3ab74d | 550 | EXPORT_SYMBOL(rtas_set_power_level); |
1da177e4 LT |
551 | |
552 | int rtas_get_sensor(int sensor, int index, int *state) | |
553 | { | |
554 | int token = rtas_token("get-sensor-state"); | |
1da177e4 LT |
555 | int rc; |
556 | ||
557 | if (token == RTAS_UNKNOWN_SERVICE) | |
558 | return -ENOENT; | |
559 | ||
507279db | 560 | do { |
1da177e4 | 561 | rc = rtas_call(token, 2, 2, state, sensor, index); |
507279db | 562 | } while (rtas_busy_delay(rc)); |
1da177e4 LT |
563 | |
564 | if (rc < 0) | |
565 | return rtas_error_rc(rc); | |
566 | return rc; | |
567 | } | |
ab3ab74d | 568 | EXPORT_SYMBOL(rtas_get_sensor); |
1da177e4 LT |
569 | |
570 | int rtas_set_indicator(int indicator, int index, int new_value) | |
571 | { | |
572 | int token = rtas_token("set-indicator"); | |
1da177e4 LT |
573 | int rc; |
574 | ||
575 | if (token == RTAS_UNKNOWN_SERVICE) | |
576 | return -ENOENT; | |
577 | ||
507279db | 578 | do { |
1da177e4 | 579 | rc = rtas_call(token, 3, 1, NULL, indicator, index, new_value); |
507279db | 580 | } while (rtas_busy_delay(rc)); |
1da177e4 LT |
581 | |
582 | if (rc < 0) | |
583 | return rtas_error_rc(rc); | |
584 | return rc; | |
585 | } | |
ab3ab74d | 586 | EXPORT_SYMBOL(rtas_set_indicator); |
1da177e4 | 587 | |
81b73dd9 HM |
588 | /* |
589 | * Ignoring RTAS extended delay | |
590 | */ | |
591 | int rtas_set_indicator_fast(int indicator, int index, int new_value) | |
592 | { | |
593 | int rc; | |
594 | int token = rtas_token("set-indicator"); | |
595 | ||
596 | if (token == RTAS_UNKNOWN_SERVICE) | |
597 | return -ENOENT; | |
598 | ||
599 | rc = rtas_call(token, 3, 1, NULL, indicator, index, new_value); | |
600 | ||
601 | WARN_ON(rc == -2 || (rc >= 9900 && rc <= 9905)); | |
602 | ||
603 | if (rc < 0) | |
604 | return rtas_error_rc(rc); | |
605 | ||
606 | return rc; | |
607 | } | |
608 | ||
033ef338 | 609 | void rtas_restart(char *cmd) |
1da177e4 | 610 | { |
f4fcbbe9 PM |
611 | if (rtas_flash_term_hook) |
612 | rtas_flash_term_hook(SYS_RESTART); | |
1da177e4 LT |
613 | printk("RTAS system-reboot returned %d\n", |
614 | rtas_call(rtas_token("system-reboot"), 0, 1, NULL)); | |
615 | for (;;); | |
616 | } | |
617 | ||
033ef338 | 618 | void rtas_power_off(void) |
1da177e4 | 619 | { |
f4fcbbe9 PM |
620 | if (rtas_flash_term_hook) |
621 | rtas_flash_term_hook(SYS_POWER_OFF); | |
1da177e4 LT |
622 | /* allow power on only with power button press */ |
623 | printk("RTAS power-off returned %d\n", | |
624 | rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1)); | |
625 | for (;;); | |
626 | } | |
627 | ||
033ef338 | 628 | void rtas_halt(void) |
1da177e4 | 629 | { |
f4fcbbe9 PM |
630 | if (rtas_flash_term_hook) |
631 | rtas_flash_term_hook(SYS_HALT); | |
632 | /* allow power on only with power button press */ | |
633 | printk("RTAS power-off returned %d\n", | |
634 | rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1)); | |
635 | for (;;); | |
1da177e4 LT |
636 | } |
637 | ||
638 | /* Must be in the RMO region, so we place it here */ | |
639 | static char rtas_os_term_buf[2048]; | |
640 | ||
8f515061 | 641 | void rtas_os_term(char *str) |
a2b51812 LV |
642 | { |
643 | int status; | |
39ed2fe6 | 644 | |
8f515061 PM |
645 | if (panic_timeout) |
646 | return; | |
647 | ||
1da177e4 LT |
648 | if (RTAS_UNKNOWN_SERVICE == rtas_token("ibm,os-term")) |
649 | return; | |
650 | ||
8f515061 PM |
651 | snprintf(rtas_os_term_buf, 2048, "OS panic: %s", str); |
652 | ||
1da177e4 LT |
653 | do { |
654 | status = rtas_call(rtas_token("ibm,os-term"), 1, 1, NULL, | |
655 | __pa(rtas_os_term_buf)); | |
507279db | 656 | } while (rtas_busy_delay(status)); |
1da177e4 | 657 | |
507279db JR |
658 | if (status != 0) |
659 | printk(KERN_EMERG "ibm,os-term call failed %d\n", | |
1da177e4 | 660 | status); |
1da177e4 LT |
661 | } |
662 | ||
91dc182c DB |
663 | static int ibm_suspend_me_token = RTAS_UNKNOWN_SERVICE; |
664 | #ifdef CONFIG_PPC_PSERIES | |
665 | static void rtas_percpu_suspend_me(void *info) | |
666 | { | |
667 | long rc; | |
8f5c7579 NL |
668 | unsigned long msr_save; |
669 | int cpu; | |
91dc182c DB |
670 | struct rtas_suspend_me_data *data = |
671 | (struct rtas_suspend_me_data *)info; | |
672 | ||
8f5c7579 NL |
673 | atomic_inc(&data->working); |
674 | ||
675 | /* really need to ensure MSR.EE is off for H_JOIN */ | |
676 | msr_save = mfmsr(); | |
677 | mtmsr(msr_save & ~(MSR_EE)); | |
678 | ||
679 | rc = plpar_hcall_norets(H_JOIN); | |
680 | ||
681 | mtmsr(msr_save); | |
91dc182c | 682 | |
8f5c7579 NL |
683 | if (rc == H_SUCCESS) { |
684 | /* This cpu was prodded and the suspend is complete. */ | |
685 | goto out; | |
686 | } else if (rc == H_CONTINUE) { | |
687 | /* All other cpus are in H_JOIN, this cpu does | |
688 | * the suspend. | |
689 | */ | |
690 | printk(KERN_DEBUG "calling ibm,suspend-me on cpu %i\n", | |
691 | smp_processor_id()); | |
692 | data->error = rtas_call(data->token, 0, 1, NULL); | |
693 | ||
694 | if (data->error) | |
695 | printk(KERN_DEBUG "ibm,suspend-me returned %d\n", | |
696 | data->error); | |
91dc182c | 697 | } else { |
8f5c7579 NL |
698 | printk(KERN_ERR "H_JOIN on cpu %i failed with rc = %ld\n", |
699 | smp_processor_id(), rc); | |
700 | data->error = rc; | |
91dc182c | 701 | } |
8f5c7579 NL |
702 | /* This cpu did the suspend or got an error; in either case, |
703 | * we need to prod all other other cpus out of join state. | |
704 | * Extra prods are harmless. | |
705 | */ | |
706 | for_each_online_cpu(cpu) | |
707 | plpar_hcall_norets(H_PROD, get_hard_smp_processor_id(cpu)); | |
91dc182c | 708 | out: |
8f5c7579 NL |
709 | if (atomic_dec_return(&data->working) == 0) |
710 | complete(data->complete); | |
91dc182c DB |
711 | } |
712 | ||
713 | static int rtas_ibm_suspend_me(struct rtas_args *args) | |
714 | { | |
368a6ba5 DB |
715 | long state; |
716 | long rc; | |
b9377ffc | 717 | unsigned long retbuf[PLPAR_HCALL_BUFSIZE]; |
91dc182c | 718 | struct rtas_suspend_me_data data; |
8f5c7579 NL |
719 | DECLARE_COMPLETION_ONSTACK(done); |
720 | ||
721 | if (!rtas_service_present("ibm,suspend-me")) | |
722 | return -ENOSYS; | |
91dc182c | 723 | |
368a6ba5 | 724 | /* Make sure the state is valid */ |
b9377ffc AB |
725 | rc = plpar_hcall(H_VASI_STATE, retbuf, |
726 | ((u64)args->args[0] << 32) | args->args[1]); | |
727 | ||
728 | state = retbuf[0]; | |
368a6ba5 DB |
729 | |
730 | if (rc) { | |
731 | printk(KERN_ERR "rtas_ibm_suspend_me: vasi_state returned %ld\n",rc); | |
732 | return rc; | |
733 | } else if (state == H_VASI_ENABLED) { | |
734 | args->args[args->nargs] = RTAS_NOT_SUSPENDABLE; | |
735 | return 0; | |
736 | } else if (state != H_VASI_SUSPENDING) { | |
737 | printk(KERN_ERR "rtas_ibm_suspend_me: vasi_state returned state %ld\n", | |
738 | state); | |
739 | args->args[args->nargs] = -1; | |
740 | return 0; | |
741 | } | |
742 | ||
8f5c7579 NL |
743 | atomic_set(&data.working, 0); |
744 | data.token = rtas_token("ibm,suspend-me"); | |
745 | data.error = 0; | |
746 | data.complete = &done; | |
91dc182c DB |
747 | |
748 | /* Call function on all CPUs. One of us will make the | |
749 | * rtas call | |
750 | */ | |
751 | if (on_each_cpu(rtas_percpu_suspend_me, &data, 1, 0)) | |
8f5c7579 | 752 | data.error = -EINVAL; |
91dc182c | 753 | |
8f5c7579 | 754 | wait_for_completion(&done); |
91dc182c | 755 | |
8f5c7579 NL |
756 | if (data.error != 0) |
757 | printk(KERN_ERR "Error doing global join\n"); | |
91dc182c | 758 | |
8f5c7579 | 759 | return data.error; |
91dc182c DB |
760 | } |
761 | #else /* CONFIG_PPC_PSERIES */ | |
762 | static int rtas_ibm_suspend_me(struct rtas_args *args) | |
763 | { | |
764 | return -ENOSYS; | |
765 | } | |
766 | #endif | |
1da177e4 LT |
767 | |
768 | asmlinkage int ppc_rtas(struct rtas_args __user *uargs) | |
769 | { | |
770 | struct rtas_args args; | |
771 | unsigned long flags; | |
033ef338 | 772 | char *buff_copy, *errbuf = NULL; |
1da177e4 | 773 | int nargs; |
91dc182c | 774 | int rc; |
1da177e4 LT |
775 | |
776 | if (!capable(CAP_SYS_ADMIN)) | |
777 | return -EPERM; | |
778 | ||
779 | if (copy_from_user(&args, uargs, 3 * sizeof(u32)) != 0) | |
780 | return -EFAULT; | |
781 | ||
782 | nargs = args.nargs; | |
783 | if (nargs > ARRAY_SIZE(args.args) | |
784 | || args.nret > ARRAY_SIZE(args.args) | |
785 | || nargs + args.nret > ARRAY_SIZE(args.args)) | |
786 | return -EINVAL; | |
787 | ||
788 | /* Copy in args. */ | |
789 | if (copy_from_user(args.args, uargs->args, | |
790 | nargs * sizeof(rtas_arg_t)) != 0) | |
791 | return -EFAULT; | |
792 | ||
91dc182c DB |
793 | if (args.token == RTAS_UNKNOWN_SERVICE) |
794 | return -EINVAL; | |
795 | ||
796 | /* Need to handle ibm,suspend_me call specially */ | |
797 | if (args.token == ibm_suspend_me_token) { | |
798 | rc = rtas_ibm_suspend_me(&args); | |
799 | if (rc) | |
800 | return rc; | |
801 | goto copy_return; | |
802 | } | |
803 | ||
033ef338 | 804 | buff_copy = get_errorlog_buffer(); |
1da177e4 LT |
805 | |
806 | spin_lock_irqsave(&rtas.lock, flags); | |
807 | ||
808 | rtas.args = args; | |
809 | enter_rtas(__pa(&rtas.args)); | |
810 | args = rtas.args; | |
811 | ||
812 | args.rets = &args.args[nargs]; | |
813 | ||
814 | /* A -1 return code indicates that the last command couldn't | |
815 | be completed due to a hardware error. */ | |
033ef338 PM |
816 | if (args.rets[0] == -1) |
817 | errbuf = __fetch_rtas_last_error(buff_copy); | |
1da177e4 LT |
818 | |
819 | spin_unlock_irqrestore(&rtas.lock, flags); | |
820 | ||
821 | if (buff_copy) { | |
033ef338 PM |
822 | if (errbuf) |
823 | log_error(errbuf, ERR_TYPE_RTAS_LOG, 0); | |
1da177e4 LT |
824 | kfree(buff_copy); |
825 | } | |
826 | ||
91dc182c | 827 | copy_return: |
1da177e4 LT |
828 | /* Copy out args. */ |
829 | if (copy_to_user(uargs->args + nargs, | |
830 | args.args + nargs, | |
831 | args.nret * sizeof(rtas_arg_t)) != 0) | |
832 | return -EFAULT; | |
833 | ||
834 | return 0; | |
835 | } | |
836 | ||
1da177e4 | 837 | /* |
943ffb58 | 838 | * Call early during boot, before mem init or bootmem, to retrieve the RTAS |
1da177e4 LT |
839 | * informations from the device-tree and allocate the RMO buffer for userland |
840 | * accesses. | |
841 | */ | |
842 | void __init rtas_initialize(void) | |
843 | { | |
033ef338 PM |
844 | unsigned long rtas_region = RTAS_INSTANTIATE_MAX; |
845 | ||
1da177e4 LT |
846 | /* Get RTAS dev node and fill up our "rtas" structure with infos |
847 | * about it. | |
848 | */ | |
849 | rtas.dev = of_find_node_by_name(NULL, "rtas"); | |
850 | if (rtas.dev) { | |
a7f67bdf | 851 | const u32 *basep, *entryp, *sizep; |
1da177e4 | 852 | |
e2eb6392 SR |
853 | basep = of_get_property(rtas.dev, "linux,rtas-base", NULL); |
854 | sizep = of_get_property(rtas.dev, "rtas-size", NULL); | |
1da177e4 LT |
855 | if (basep != NULL && sizep != NULL) { |
856 | rtas.base = *basep; | |
857 | rtas.size = *sizep; | |
e2eb6392 | 858 | entryp = of_get_property(rtas.dev, |
a7f67bdf | 859 | "linux,rtas-entry", NULL); |
1da177e4 LT |
860 | if (entryp == NULL) /* Ugh */ |
861 | rtas.entry = rtas.base; | |
862 | else | |
863 | rtas.entry = *entryp; | |
864 | } else | |
865 | rtas.dev = NULL; | |
866 | } | |
033ef338 PM |
867 | if (!rtas.dev) |
868 | return; | |
869 | ||
1da177e4 LT |
870 | /* If RTAS was found, allocate the RMO buffer for it and look for |
871 | * the stop-self token if any | |
872 | */ | |
033ef338 | 873 | #ifdef CONFIG_PPC64 |
e8222502 | 874 | if (machine_is(pseries) && firmware_has_feature(FW_FEATURE_LPAR)) { |
033ef338 | 875 | rtas_region = min(lmb.rmo_size, RTAS_INSTANTIATE_MAX); |
91dc182c DB |
876 | ibm_suspend_me_token = rtas_token("ibm,suspend-me"); |
877 | } | |
033ef338 PM |
878 | #endif |
879 | rtas_rmo_buf = lmb_alloc_base(RTAS_RMOBUF_MAX, PAGE_SIZE, rtas_region); | |
1da177e4 | 880 | |
033ef338 PM |
881 | #ifdef CONFIG_RTAS_ERROR_LOGGING |
882 | rtas_last_error_token = rtas_token("rtas-last-error"); | |
883 | #endif | |
1da177e4 | 884 | } |
458148c0 ME |
885 | |
886 | int __init early_init_dt_scan_rtas(unsigned long node, | |
887 | const char *uname, int depth, void *data) | |
888 | { | |
889 | u32 *basep, *entryp, *sizep; | |
890 | ||
891 | if (depth != 1 || strcmp(uname, "rtas") != 0) | |
892 | return 0; | |
893 | ||
894 | basep = of_get_flat_dt_prop(node, "linux,rtas-base", NULL); | |
895 | entryp = of_get_flat_dt_prop(node, "linux,rtas-entry", NULL); | |
896 | sizep = of_get_flat_dt_prop(node, "rtas-size", NULL); | |
897 | ||
898 | if (basep && entryp && sizep) { | |
899 | rtas.base = *basep; | |
900 | rtas.entry = *entryp; | |
901 | rtas.size = *sizep; | |
902 | } | |
903 | ||
cc46bb98 ME |
904 | #ifdef CONFIG_UDBG_RTAS_CONSOLE |
905 | basep = of_get_flat_dt_prop(node, "put-term-char", NULL); | |
906 | if (basep) | |
907 | rtas_putchar_token = *basep; | |
908 | ||
909 | basep = of_get_flat_dt_prop(node, "get-term-char", NULL); | |
910 | if (basep) | |
911 | rtas_getchar_token = *basep; | |
9a2ded55 MN |
912 | |
913 | if (rtas_putchar_token != RTAS_UNKNOWN_SERVICE && | |
914 | rtas_getchar_token != RTAS_UNKNOWN_SERVICE) | |
915 | udbg_init_rtas_console(); | |
916 | ||
cc46bb98 ME |
917 | #endif |
918 | ||
458148c0 ME |
919 | /* break now */ |
920 | return 1; | |
921 | } |