]>
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> | |
d9b2b2a2 | 25 | #include <linux/lmb.h> |
1da177e4 LT |
26 | |
27 | #include <asm/prom.h> | |
28 | #include <asm/rtas.h> | |
31a7f67e | 29 | #include <asm/hvcall.h> |
1da177e4 | 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> | |
296167ae | 37 | #include <asm/udbg.h> |
a7f31841 | 38 | #include <asm/syscalls.h> |
8f5c7579 NL |
39 | #include <asm/smp.h> |
40 | #include <asm/atomic.h> | |
1da177e4 | 41 | |
033ef338 | 42 | struct rtas_t rtas = { |
1da177e4 LT |
43 | .lock = SPIN_LOCK_UNLOCKED |
44 | }; | |
ab3ab74d | 45 | EXPORT_SYMBOL(rtas); |
1da177e4 | 46 | |
91dc182c | 47 | struct rtas_suspend_me_data { |
8f5c7579 NL |
48 | atomic_t working; /* number of cpus accessing this struct */ |
49 | int token; /* ibm,suspend-me */ | |
50 | int error; | |
51 | struct completion *complete; /* wait on this until working == 0 */ | |
91dc182c DB |
52 | }; |
53 | ||
1da177e4 | 54 | DEFINE_SPINLOCK(rtas_data_buf_lock); |
ab3ab74d ME |
55 | EXPORT_SYMBOL(rtas_data_buf_lock); |
56 | ||
033ef338 | 57 | char rtas_data_buf[RTAS_DATA_BUF_SIZE] __cacheline_aligned; |
ab3ab74d ME |
58 | EXPORT_SYMBOL(rtas_data_buf); |
59 | ||
1da177e4 LT |
60 | unsigned long rtas_rmo_buf; |
61 | ||
f4fcbbe9 PM |
62 | /* |
63 | * If non-NULL, this gets called when the kernel terminates. | |
64 | * This is done like this so rtas_flash can be a module. | |
65 | */ | |
66 | void (*rtas_flash_term_hook)(int); | |
67 | EXPORT_SYMBOL(rtas_flash_term_hook); | |
68 | ||
033ef338 PM |
69 | /* |
70 | * call_rtas_display_status and call_rtas_display_status_delay | |
71 | * are designed only for very early low-level debugging, which | |
72 | * is why the token is hard-coded to 10. | |
73 | */ | |
296167ae | 74 | static void call_rtas_display_status(char c) |
1da177e4 LT |
75 | { |
76 | struct rtas_args *args = &rtas.args; | |
77 | unsigned long s; | |
78 | ||
79 | if (!rtas.base) | |
80 | return; | |
81 | spin_lock_irqsave(&rtas.lock, s); | |
82 | ||
83 | args->token = 10; | |
84 | args->nargs = 1; | |
85 | args->nret = 1; | |
86 | args->rets = (rtas_arg_t *)&(args->args[1]); | |
296167ae | 87 | args->args[0] = (unsigned char)c; |
1da177e4 LT |
88 | |
89 | enter_rtas(__pa(args)); | |
90 | ||
91 | spin_unlock_irqrestore(&rtas.lock, s); | |
92 | } | |
93 | ||
296167ae | 94 | static void call_rtas_display_status_delay(char c) |
1da177e4 LT |
95 | { |
96 | static int pending_newline = 0; /* did last write end with unprinted newline? */ | |
97 | static int width = 16; | |
98 | ||
99 | if (c == '\n') { | |
100 | while (width-- > 0) | |
101 | call_rtas_display_status(' '); | |
102 | width = 16; | |
21fe3301 | 103 | mdelay(500); |
1da177e4 LT |
104 | pending_newline = 1; |
105 | } else { | |
106 | if (pending_newline) { | |
107 | call_rtas_display_status('\r'); | |
108 | call_rtas_display_status('\n'); | |
109 | } | |
110 | pending_newline = 0; | |
111 | if (width--) { | |
112 | call_rtas_display_status(c); | |
113 | udelay(10000); | |
114 | } | |
115 | } | |
116 | } | |
117 | ||
cc46bb98 | 118 | void __init udbg_init_rtas_panel(void) |
296167ae ME |
119 | { |
120 | udbg_putc = call_rtas_display_status_delay; | |
121 | } | |
122 | ||
cc46bb98 ME |
123 | #ifdef CONFIG_UDBG_RTAS_CONSOLE |
124 | ||
125 | /* If you think you're dying before early_init_dt_scan_rtas() does its | |
126 | * work, you can hard code the token values for your firmware here and | |
127 | * hardcode rtas.base/entry etc. | |
128 | */ | |
129 | static unsigned int rtas_putchar_token = RTAS_UNKNOWN_SERVICE; | |
130 | static unsigned int rtas_getchar_token = RTAS_UNKNOWN_SERVICE; | |
131 | ||
132 | static void udbg_rtascon_putc(char c) | |
133 | { | |
134 | int tries; | |
135 | ||
136 | if (!rtas.base) | |
137 | return; | |
138 | ||
139 | /* Add CRs before LFs */ | |
140 | if (c == '\n') | |
141 | udbg_rtascon_putc('\r'); | |
142 | ||
143 | /* if there is more than one character to be displayed, wait a bit */ | |
144 | for (tries = 0; tries < 16; tries++) { | |
145 | if (rtas_call(rtas_putchar_token, 1, 1, NULL, c) == 0) | |
146 | break; | |
147 | udelay(1000); | |
148 | } | |
149 | } | |
150 | ||
151 | static int udbg_rtascon_getc_poll(void) | |
152 | { | |
153 | int c; | |
154 | ||
155 | if (!rtas.base) | |
156 | return -1; | |
157 | ||
158 | if (rtas_call(rtas_getchar_token, 0, 2, &c)) | |
159 | return -1; | |
160 | ||
161 | return c; | |
162 | } | |
163 | ||
164 | static int udbg_rtascon_getc(void) | |
165 | { | |
166 | int c; | |
167 | ||
168 | while ((c = udbg_rtascon_getc_poll()) == -1) | |
169 | ; | |
170 | ||
171 | return c; | |
172 | } | |
173 | ||
174 | ||
175 | void __init udbg_init_rtas_console(void) | |
176 | { | |
177 | udbg_putc = udbg_rtascon_putc; | |
178 | udbg_getc = udbg_rtascon_getc; | |
179 | udbg_getc_poll = udbg_rtascon_getc_poll; | |
180 | } | |
181 | #endif /* CONFIG_UDBG_RTAS_CONSOLE */ | |
182 | ||
033ef338 | 183 | void rtas_progress(char *s, unsigned short hex) |
6566c6f1 AB |
184 | { |
185 | struct device_node *root; | |
a7f67bdf JK |
186 | int width; |
187 | const int *p; | |
6566c6f1 AB |
188 | char *os; |
189 | static int display_character, set_indicator; | |
a7f67bdf | 190 | static int display_width, display_lines, form_feed; |
c5a69d57 | 191 | static const int *row_width; |
6566c6f1 | 192 | static DEFINE_SPINLOCK(progress_lock); |
8f586b22 | 193 | static int current_line; |
6566c6f1 AB |
194 | static int pending_newline = 0; /* did last write end with unprinted newline? */ |
195 | ||
196 | if (!rtas.base) | |
197 | return; | |
198 | ||
8f586b22 MS |
199 | if (display_width == 0) { |
200 | display_width = 0x10; | |
8c8dc322 | 201 | if ((root = of_find_node_by_path("/rtas"))) { |
e2eb6392 | 202 | if ((p = of_get_property(root, |
8f586b22 MS |
203 | "ibm,display-line-length", NULL))) |
204 | display_width = *p; | |
e2eb6392 | 205 | if ((p = of_get_property(root, |
8f586b22 MS |
206 | "ibm,form-feed", NULL))) |
207 | form_feed = *p; | |
e2eb6392 | 208 | if ((p = of_get_property(root, |
8f586b22 MS |
209 | "ibm,display-number-of-lines", NULL))) |
210 | display_lines = *p; | |
e2eb6392 | 211 | row_width = of_get_property(root, |
8f586b22 | 212 | "ibm,display-truncation-length", NULL); |
8c8dc322 | 213 | of_node_put(root); |
8f586b22 | 214 | } |
6566c6f1 AB |
215 | display_character = rtas_token("display-character"); |
216 | set_indicator = rtas_token("set-indicator"); | |
217 | } | |
218 | ||
219 | if (display_character == RTAS_UNKNOWN_SERVICE) { | |
220 | /* use hex display if available */ | |
221 | if (set_indicator != RTAS_UNKNOWN_SERVICE) | |
222 | rtas_call(set_indicator, 3, 1, NULL, 6, 0, hex); | |
223 | return; | |
224 | } | |
225 | ||
226 | spin_lock(&progress_lock); | |
227 | ||
228 | /* | |
229 | * Last write ended with newline, but we didn't print it since | |
230 | * it would just clear the bottom line of output. Print it now | |
231 | * instead. | |
232 | * | |
8f586b22 MS |
233 | * If no newline is pending and form feed is supported, clear the |
234 | * display with a form feed; otherwise, print a CR to start output | |
235 | * at the beginning of the line. | |
6566c6f1 AB |
236 | */ |
237 | if (pending_newline) { | |
238 | rtas_call(display_character, 1, 1, NULL, '\r'); | |
239 | rtas_call(display_character, 1, 1, NULL, '\n'); | |
240 | pending_newline = 0; | |
241 | } else { | |
8f586b22 MS |
242 | current_line = 0; |
243 | if (form_feed) | |
244 | rtas_call(display_character, 1, 1, NULL, | |
245 | (char)form_feed); | |
246 | else | |
247 | rtas_call(display_character, 1, 1, NULL, '\r'); | |
6566c6f1 AB |
248 | } |
249 | ||
8f586b22 MS |
250 | if (row_width) |
251 | width = row_width[current_line]; | |
252 | else | |
253 | width = display_width; | |
6566c6f1 AB |
254 | os = s; |
255 | while (*os) { | |
256 | if (*os == '\n' || *os == '\r') { | |
6566c6f1 AB |
257 | /* If newline is the last character, save it |
258 | * until next call to avoid bumping up the | |
259 | * display output. | |
260 | */ | |
261 | if (*os == '\n' && !os[1]) { | |
262 | pending_newline = 1; | |
8f586b22 MS |
263 | current_line++; |
264 | if (current_line > display_lines-1) | |
265 | current_line = display_lines-1; | |
6566c6f1 AB |
266 | spin_unlock(&progress_lock); |
267 | return; | |
268 | } | |
269 | ||
270 | /* RTAS wants CR-LF, not just LF */ | |
271 | ||
272 | if (*os == '\n') { | |
273 | rtas_call(display_character, 1, 1, NULL, '\r'); | |
274 | rtas_call(display_character, 1, 1, NULL, '\n'); | |
275 | } else { | |
276 | /* CR might be used to re-draw a line, so we'll | |
277 | * leave it alone and not add LF. | |
278 | */ | |
279 | rtas_call(display_character, 1, 1, NULL, *os); | |
280 | } | |
281 | ||
8f586b22 MS |
282 | if (row_width) |
283 | width = row_width[current_line]; | |
284 | else | |
285 | width = display_width; | |
6566c6f1 AB |
286 | } else { |
287 | width--; | |
288 | rtas_call(display_character, 1, 1, NULL, *os); | |
289 | } | |
290 | ||
291 | os++; | |
292 | ||
293 | /* if we overwrite the screen length */ | |
294 | if (width <= 0) | |
295 | while ((*os != 0) && (*os != '\n') && (*os != '\r')) | |
296 | os++; | |
297 | } | |
298 | ||
6566c6f1 AB |
299 | spin_unlock(&progress_lock); |
300 | } | |
f4fcbbe9 | 301 | EXPORT_SYMBOL(rtas_progress); /* needed by rtas_flash module */ |
6566c6f1 | 302 | |
033ef338 | 303 | int rtas_token(const char *service) |
1da177e4 | 304 | { |
a7f67bdf | 305 | const int *tokp; |
033ef338 | 306 | if (rtas.dev == NULL) |
1da177e4 | 307 | return RTAS_UNKNOWN_SERVICE; |
e2eb6392 | 308 | tokp = of_get_property(rtas.dev, service, NULL); |
1da177e4 LT |
309 | return tokp ? *tokp : RTAS_UNKNOWN_SERVICE; |
310 | } | |
ab3ab74d | 311 | EXPORT_SYMBOL(rtas_token); |
1da177e4 | 312 | |
f2d6d2d8 NL |
313 | int rtas_service_present(const char *service) |
314 | { | |
315 | return rtas_token(service) != RTAS_UNKNOWN_SERVICE; | |
316 | } | |
317 | EXPORT_SYMBOL(rtas_service_present); | |
318 | ||
033ef338 | 319 | #ifdef CONFIG_RTAS_ERROR_LOGGING |
1da177e4 LT |
320 | /* |
321 | * Return the firmware-specified size of the error log buffer | |
322 | * for all rtas calls that require an error buffer argument. | |
323 | * This includes 'check-exception' and 'rtas-last-error'. | |
324 | */ | |
325 | int rtas_get_error_log_max(void) | |
326 | { | |
327 | static int rtas_error_log_max; | |
328 | if (rtas_error_log_max) | |
329 | return rtas_error_log_max; | |
330 | ||
331 | rtas_error_log_max = rtas_token ("rtas-error-log-max"); | |
332 | if ((rtas_error_log_max == RTAS_UNKNOWN_SERVICE) || | |
333 | (rtas_error_log_max > RTAS_ERROR_LOG_MAX)) { | |
033ef338 PM |
334 | printk (KERN_WARNING "RTAS: bad log buffer size %d\n", |
335 | rtas_error_log_max); | |
1da177e4 LT |
336 | rtas_error_log_max = RTAS_ERROR_LOG_MAX; |
337 | } | |
338 | return rtas_error_log_max; | |
339 | } | |
033ef338 | 340 | EXPORT_SYMBOL(rtas_get_error_log_max); |
1da177e4 LT |
341 | |
342 | ||
1c21a293 ME |
343 | static char rtas_err_buf[RTAS_ERROR_LOG_MAX]; |
344 | static int rtas_last_error_token; | |
033ef338 | 345 | |
1da177e4 LT |
346 | /** Return a copy of the detailed error text associated with the |
347 | * most recent failed call to rtas. Because the error text | |
348 | * might go stale if there are any other intervening rtas calls, | |
349 | * this routine must be called atomically with whatever produced | |
350 | * the error (i.e. with rtas.lock still held from the previous call). | |
351 | */ | |
033ef338 | 352 | static char *__fetch_rtas_last_error(char *altbuf) |
1da177e4 LT |
353 | { |
354 | struct rtas_args err_args, save_args; | |
355 | u32 bufsz; | |
033ef338 PM |
356 | char *buf = NULL; |
357 | ||
358 | if (rtas_last_error_token == -1) | |
359 | return NULL; | |
1da177e4 LT |
360 | |
361 | bufsz = rtas_get_error_log_max(); | |
362 | ||
033ef338 | 363 | err_args.token = rtas_last_error_token; |
1da177e4 LT |
364 | err_args.nargs = 2; |
365 | err_args.nret = 1; | |
1da177e4 LT |
366 | err_args.args[0] = (rtas_arg_t)__pa(rtas_err_buf); |
367 | err_args.args[1] = bufsz; | |
368 | err_args.args[2] = 0; | |
369 | ||
370 | save_args = rtas.args; | |
371 | rtas.args = err_args; | |
372 | ||
373 | enter_rtas(__pa(&rtas.args)); | |
374 | ||
375 | err_args = rtas.args; | |
376 | rtas.args = save_args; | |
377 | ||
033ef338 PM |
378 | /* Log the error in the unlikely case that there was one. */ |
379 | if (unlikely(err_args.args[2] == 0)) { | |
380 | if (altbuf) { | |
381 | buf = altbuf; | |
382 | } else { | |
383 | buf = rtas_err_buf; | |
384 | if (mem_init_done) | |
385 | buf = kmalloc(RTAS_ERROR_LOG_MAX, GFP_ATOMIC); | |
386 | } | |
387 | if (buf) | |
388 | memcpy(buf, rtas_err_buf, RTAS_ERROR_LOG_MAX); | |
389 | } | |
390 | ||
391 | return buf; | |
1da177e4 LT |
392 | } |
393 | ||
033ef338 PM |
394 | #define get_errorlog_buffer() kmalloc(RTAS_ERROR_LOG_MAX, GFP_KERNEL) |
395 | ||
396 | #else /* CONFIG_RTAS_ERROR_LOGGING */ | |
397 | #define __fetch_rtas_last_error(x) NULL | |
398 | #define get_errorlog_buffer() NULL | |
399 | #endif | |
400 | ||
1da177e4 LT |
401 | int rtas_call(int token, int nargs, int nret, int *outputs, ...) |
402 | { | |
403 | va_list list; | |
033ef338 | 404 | int i; |
1da177e4 LT |
405 | unsigned long s; |
406 | struct rtas_args *rtas_args; | |
033ef338 | 407 | char *buff_copy = NULL; |
1da177e4 LT |
408 | int ret; |
409 | ||
24da3dd5 | 410 | if (!rtas.entry || token == RTAS_UNKNOWN_SERVICE) |
1da177e4 LT |
411 | return -1; |
412 | ||
413 | /* Gotta do something different here, use global lock for now... */ | |
414 | spin_lock_irqsave(&rtas.lock, s); | |
415 | rtas_args = &rtas.args; | |
416 | ||
417 | rtas_args->token = token; | |
418 | rtas_args->nargs = nargs; | |
419 | rtas_args->nret = nret; | |
420 | rtas_args->rets = (rtas_arg_t *)&(rtas_args->args[nargs]); | |
421 | va_start(list, outputs); | |
033ef338 | 422 | for (i = 0; i < nargs; ++i) |
1da177e4 | 423 | rtas_args->args[i] = va_arg(list, rtas_arg_t); |
1da177e4 LT |
424 | va_end(list); |
425 | ||
426 | for (i = 0; i < nret; ++i) | |
427 | rtas_args->rets[i] = 0; | |
428 | ||
1da177e4 | 429 | enter_rtas(__pa(rtas_args)); |
1da177e4 LT |
430 | |
431 | /* A -1 return code indicates that the last command couldn't | |
432 | be completed due to a hardware error. */ | |
433 | if (rtas_args->rets[0] == -1) | |
033ef338 | 434 | buff_copy = __fetch_rtas_last_error(NULL); |
1da177e4 LT |
435 | |
436 | if (nret > 1 && outputs != NULL) | |
437 | for (i = 0; i < nret-1; ++i) | |
438 | outputs[i] = rtas_args->rets[i+1]; | |
439 | ret = (nret > 0)? rtas_args->rets[0]: 0; | |
440 | ||
1da177e4 LT |
441 | /* Gotta do something different here, use global lock for now... */ |
442 | spin_unlock_irqrestore(&rtas.lock, s); | |
443 | ||
444 | if (buff_copy) { | |
445 | log_error(buff_copy, ERR_TYPE_RTAS_LOG, 0); | |
446 | if (mem_init_done) | |
447 | kfree(buff_copy); | |
448 | } | |
449 | return ret; | |
450 | } | |
ab3ab74d | 451 | EXPORT_SYMBOL(rtas_call); |
1da177e4 | 452 | |
507279db JR |
453 | /* For RTAS_BUSY (-2), delay for 1 millisecond. For an extended busy status |
454 | * code of 990n, perform the hinted delay of 10^n (last digit) milliseconds. | |
1da177e4 | 455 | */ |
507279db | 456 | unsigned int rtas_busy_delay_time(int status) |
1da177e4 | 457 | { |
507279db JR |
458 | int order; |
459 | unsigned int ms = 0; | |
460 | ||
461 | if (status == RTAS_BUSY) { | |
462 | ms = 1; | |
463 | } else if (status >= 9900 && status <= 9905) { | |
464 | order = status - 9900; | |
465 | for (ms = 1; order > 0; order--) | |
466 | ms *= 10; | |
467 | } | |
1da177e4 | 468 | |
507279db JR |
469 | return ms; |
470 | } | |
ab3ab74d | 471 | EXPORT_SYMBOL(rtas_busy_delay_time); |
1da177e4 | 472 | |
507279db JR |
473 | /* For an RTAS busy status code, perform the hinted delay. */ |
474 | unsigned int rtas_busy_delay(int status) | |
475 | { | |
476 | unsigned int ms; | |
1da177e4 | 477 | |
507279db JR |
478 | might_sleep(); |
479 | ms = rtas_busy_delay_time(status); | |
480 | if (ms) | |
481 | msleep(ms); | |
482 | ||
483 | return ms; | |
1da177e4 | 484 | } |
ab3ab74d | 485 | EXPORT_SYMBOL(rtas_busy_delay); |
1da177e4 | 486 | |
1c21a293 | 487 | static int rtas_error_rc(int rtas_rc) |
1da177e4 LT |
488 | { |
489 | int rc; | |
490 | ||
491 | switch (rtas_rc) { | |
492 | case -1: /* Hardware Error */ | |
493 | rc = -EIO; | |
494 | break; | |
495 | case -3: /* Bad indicator/domain/etc */ | |
496 | rc = -EINVAL; | |
497 | break; | |
498 | case -9000: /* Isolation error */ | |
499 | rc = -EFAULT; | |
500 | break; | |
501 | case -9001: /* Outstanding TCE/PTE */ | |
502 | rc = -EEXIST; | |
503 | break; | |
504 | case -9002: /* No usable slot */ | |
505 | rc = -ENODEV; | |
506 | break; | |
507 | default: | |
508 | printk(KERN_ERR "%s: unexpected RTAS error %d\n", | |
e48b1b45 | 509 | __func__, rtas_rc); |
1da177e4 LT |
510 | rc = -ERANGE; |
511 | break; | |
512 | } | |
513 | return rc; | |
514 | } | |
515 | ||
516 | int rtas_get_power_level(int powerdomain, int *level) | |
517 | { | |
518 | int token = rtas_token("get-power-level"); | |
519 | int rc; | |
520 | ||
521 | if (token == RTAS_UNKNOWN_SERVICE) | |
522 | return -ENOENT; | |
523 | ||
524 | while ((rc = rtas_call(token, 1, 2, level, powerdomain)) == RTAS_BUSY) | |
525 | udelay(1); | |
526 | ||
527 | if (rc < 0) | |
528 | return rtas_error_rc(rc); | |
529 | return rc; | |
530 | } | |
ab3ab74d | 531 | EXPORT_SYMBOL(rtas_get_power_level); |
1da177e4 LT |
532 | |
533 | int rtas_set_power_level(int powerdomain, int level, int *setlevel) | |
534 | { | |
535 | int token = rtas_token("set-power-level"); | |
1da177e4 LT |
536 | int rc; |
537 | ||
538 | if (token == RTAS_UNKNOWN_SERVICE) | |
539 | return -ENOENT; | |
540 | ||
507279db | 541 | do { |
1da177e4 | 542 | rc = rtas_call(token, 2, 2, setlevel, powerdomain, level); |
507279db | 543 | } while (rtas_busy_delay(rc)); |
1da177e4 LT |
544 | |
545 | if (rc < 0) | |
546 | return rtas_error_rc(rc); | |
547 | return rc; | |
548 | } | |
ab3ab74d | 549 | EXPORT_SYMBOL(rtas_set_power_level); |
1da177e4 LT |
550 | |
551 | int rtas_get_sensor(int sensor, int index, int *state) | |
552 | { | |
553 | int token = rtas_token("get-sensor-state"); | |
1da177e4 LT |
554 | int rc; |
555 | ||
556 | if (token == RTAS_UNKNOWN_SERVICE) | |
557 | return -ENOENT; | |
558 | ||
507279db | 559 | do { |
1da177e4 | 560 | rc = rtas_call(token, 2, 2, state, sensor, index); |
507279db | 561 | } while (rtas_busy_delay(rc)); |
1da177e4 LT |
562 | |
563 | if (rc < 0) | |
564 | return rtas_error_rc(rc); | |
565 | return rc; | |
566 | } | |
ab3ab74d | 567 | EXPORT_SYMBOL(rtas_get_sensor); |
1da177e4 LT |
568 | |
569 | int rtas_set_indicator(int indicator, int index, int new_value) | |
570 | { | |
571 | int token = rtas_token("set-indicator"); | |
1da177e4 LT |
572 | int rc; |
573 | ||
574 | if (token == RTAS_UNKNOWN_SERVICE) | |
575 | return -ENOENT; | |
576 | ||
507279db | 577 | do { |
1da177e4 | 578 | rc = rtas_call(token, 3, 1, NULL, indicator, index, new_value); |
507279db | 579 | } while (rtas_busy_delay(rc)); |
1da177e4 LT |
580 | |
581 | if (rc < 0) | |
582 | return rtas_error_rc(rc); | |
583 | return rc; | |
584 | } | |
ab3ab74d | 585 | EXPORT_SYMBOL(rtas_set_indicator); |
1da177e4 | 586 | |
81b73dd9 HM |
587 | /* |
588 | * Ignoring RTAS extended delay | |
589 | */ | |
590 | int rtas_set_indicator_fast(int indicator, int index, int new_value) | |
591 | { | |
592 | int rc; | |
593 | int token = rtas_token("set-indicator"); | |
594 | ||
595 | if (token == RTAS_UNKNOWN_SERVICE) | |
596 | return -ENOENT; | |
597 | ||
598 | rc = rtas_call(token, 3, 1, NULL, indicator, index, new_value); | |
599 | ||
600 | WARN_ON(rc == -2 || (rc >= 9900 && rc <= 9905)); | |
601 | ||
602 | if (rc < 0) | |
603 | return rtas_error_rc(rc); | |
604 | ||
605 | return rc; | |
606 | } | |
607 | ||
033ef338 | 608 | void rtas_restart(char *cmd) |
1da177e4 | 609 | { |
f4fcbbe9 PM |
610 | if (rtas_flash_term_hook) |
611 | rtas_flash_term_hook(SYS_RESTART); | |
1da177e4 LT |
612 | printk("RTAS system-reboot returned %d\n", |
613 | rtas_call(rtas_token("system-reboot"), 0, 1, NULL)); | |
614 | for (;;); | |
615 | } | |
616 | ||
033ef338 | 617 | void rtas_power_off(void) |
1da177e4 | 618 | { |
f4fcbbe9 PM |
619 | if (rtas_flash_term_hook) |
620 | rtas_flash_term_hook(SYS_POWER_OFF); | |
1da177e4 LT |
621 | /* allow power on only with power button press */ |
622 | printk("RTAS power-off returned %d\n", | |
623 | rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1)); | |
624 | for (;;); | |
625 | } | |
626 | ||
033ef338 | 627 | void rtas_halt(void) |
1da177e4 | 628 | { |
f4fcbbe9 PM |
629 | if (rtas_flash_term_hook) |
630 | rtas_flash_term_hook(SYS_HALT); | |
631 | /* allow power on only with power button press */ | |
632 | printk("RTAS power-off returned %d\n", | |
633 | rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1)); | |
634 | for (;;); | |
1da177e4 LT |
635 | } |
636 | ||
637 | /* Must be in the RMO region, so we place it here */ | |
638 | static char rtas_os_term_buf[2048]; | |
639 | ||
8f515061 | 640 | void rtas_os_term(char *str) |
a2b51812 LV |
641 | { |
642 | int status; | |
39ed2fe6 | 643 | |
8f515061 PM |
644 | if (panic_timeout) |
645 | return; | |
646 | ||
1da177e4 LT |
647 | if (RTAS_UNKNOWN_SERVICE == rtas_token("ibm,os-term")) |
648 | return; | |
649 | ||
8f515061 PM |
650 | snprintf(rtas_os_term_buf, 2048, "OS panic: %s", str); |
651 | ||
1da177e4 LT |
652 | do { |
653 | status = rtas_call(rtas_token("ibm,os-term"), 1, 1, NULL, | |
654 | __pa(rtas_os_term_buf)); | |
507279db | 655 | } while (rtas_busy_delay(status)); |
1da177e4 | 656 | |
507279db JR |
657 | if (status != 0) |
658 | printk(KERN_EMERG "ibm,os-term call failed %d\n", | |
1da177e4 | 659 | status); |
1da177e4 LT |
660 | } |
661 | ||
91dc182c DB |
662 | static int ibm_suspend_me_token = RTAS_UNKNOWN_SERVICE; |
663 | #ifdef CONFIG_PPC_PSERIES | |
664 | static void rtas_percpu_suspend_me(void *info) | |
665 | { | |
666 | long rc; | |
8f5c7579 NL |
667 | unsigned long msr_save; |
668 | int cpu; | |
91dc182c DB |
669 | struct rtas_suspend_me_data *data = |
670 | (struct rtas_suspend_me_data *)info; | |
671 | ||
8f5c7579 NL |
672 | atomic_inc(&data->working); |
673 | ||
674 | /* really need to ensure MSR.EE is off for H_JOIN */ | |
675 | msr_save = mfmsr(); | |
676 | mtmsr(msr_save & ~(MSR_EE)); | |
677 | ||
678 | rc = plpar_hcall_norets(H_JOIN); | |
679 | ||
680 | mtmsr(msr_save); | |
91dc182c | 681 | |
8f5c7579 NL |
682 | if (rc == H_SUCCESS) { |
683 | /* This cpu was prodded and the suspend is complete. */ | |
684 | goto out; | |
685 | } else if (rc == H_CONTINUE) { | |
686 | /* All other cpus are in H_JOIN, this cpu does | |
687 | * the suspend. | |
688 | */ | |
689 | printk(KERN_DEBUG "calling ibm,suspend-me on cpu %i\n", | |
690 | smp_processor_id()); | |
691 | data->error = rtas_call(data->token, 0, 1, NULL); | |
692 | ||
693 | if (data->error) | |
694 | printk(KERN_DEBUG "ibm,suspend-me returned %d\n", | |
695 | data->error); | |
91dc182c | 696 | } else { |
8f5c7579 NL |
697 | printk(KERN_ERR "H_JOIN on cpu %i failed with rc = %ld\n", |
698 | smp_processor_id(), rc); | |
699 | data->error = rc; | |
91dc182c | 700 | } |
8f5c7579 NL |
701 | /* This cpu did the suspend or got an error; in either case, |
702 | * we need to prod all other other cpus out of join state. | |
703 | * Extra prods are harmless. | |
704 | */ | |
705 | for_each_online_cpu(cpu) | |
706 | plpar_hcall_norets(H_PROD, get_hard_smp_processor_id(cpu)); | |
91dc182c | 707 | out: |
8f5c7579 NL |
708 | if (atomic_dec_return(&data->working) == 0) |
709 | complete(data->complete); | |
91dc182c DB |
710 | } |
711 | ||
712 | static int rtas_ibm_suspend_me(struct rtas_args *args) | |
713 | { | |
368a6ba5 DB |
714 | long state; |
715 | long rc; | |
b9377ffc | 716 | unsigned long retbuf[PLPAR_HCALL_BUFSIZE]; |
91dc182c | 717 | struct rtas_suspend_me_data data; |
8f5c7579 NL |
718 | DECLARE_COMPLETION_ONSTACK(done); |
719 | ||
720 | if (!rtas_service_present("ibm,suspend-me")) | |
721 | return -ENOSYS; | |
91dc182c | 722 | |
368a6ba5 | 723 | /* Make sure the state is valid */ |
b9377ffc AB |
724 | rc = plpar_hcall(H_VASI_STATE, retbuf, |
725 | ((u64)args->args[0] << 32) | args->args[1]); | |
726 | ||
727 | state = retbuf[0]; | |
368a6ba5 DB |
728 | |
729 | if (rc) { | |
730 | printk(KERN_ERR "rtas_ibm_suspend_me: vasi_state returned %ld\n",rc); | |
731 | return rc; | |
732 | } else if (state == H_VASI_ENABLED) { | |
733 | args->args[args->nargs] = RTAS_NOT_SUSPENDABLE; | |
734 | return 0; | |
735 | } else if (state != H_VASI_SUSPENDING) { | |
736 | printk(KERN_ERR "rtas_ibm_suspend_me: vasi_state returned state %ld\n", | |
737 | state); | |
738 | args->args[args->nargs] = -1; | |
739 | return 0; | |
740 | } | |
741 | ||
8f5c7579 NL |
742 | atomic_set(&data.working, 0); |
743 | data.token = rtas_token("ibm,suspend-me"); | |
744 | data.error = 0; | |
745 | data.complete = &done; | |
91dc182c DB |
746 | |
747 | /* Call function on all CPUs. One of us will make the | |
748 | * rtas call | |
749 | */ | |
15c8b6c1 | 750 | if (on_each_cpu(rtas_percpu_suspend_me, &data, 0)) |
8f5c7579 | 751 | data.error = -EINVAL; |
91dc182c | 752 | |
8f5c7579 | 753 | wait_for_completion(&done); |
91dc182c | 754 | |
8f5c7579 NL |
755 | if (data.error != 0) |
756 | printk(KERN_ERR "Error doing global join\n"); | |
91dc182c | 757 | |
8f5c7579 | 758 | return data.error; |
91dc182c DB |
759 | } |
760 | #else /* CONFIG_PPC_PSERIES */ | |
761 | static int rtas_ibm_suspend_me(struct rtas_args *args) | |
762 | { | |
763 | return -ENOSYS; | |
764 | } | |
765 | #endif | |
1da177e4 LT |
766 | |
767 | asmlinkage int ppc_rtas(struct rtas_args __user *uargs) | |
768 | { | |
769 | struct rtas_args args; | |
770 | unsigned long flags; | |
033ef338 | 771 | char *buff_copy, *errbuf = NULL; |
1da177e4 | 772 | int nargs; |
91dc182c | 773 | int rc; |
1da177e4 LT |
774 | |
775 | if (!capable(CAP_SYS_ADMIN)) | |
776 | return -EPERM; | |
777 | ||
778 | if (copy_from_user(&args, uargs, 3 * sizeof(u32)) != 0) | |
779 | return -EFAULT; | |
780 | ||
781 | nargs = args.nargs; | |
782 | if (nargs > ARRAY_SIZE(args.args) | |
783 | || args.nret > ARRAY_SIZE(args.args) | |
784 | || nargs + args.nret > ARRAY_SIZE(args.args)) | |
785 | return -EINVAL; | |
786 | ||
787 | /* Copy in args. */ | |
788 | if (copy_from_user(args.args, uargs->args, | |
789 | nargs * sizeof(rtas_arg_t)) != 0) | |
790 | return -EFAULT; | |
791 | ||
91dc182c DB |
792 | if (args.token == RTAS_UNKNOWN_SERVICE) |
793 | return -EINVAL; | |
794 | ||
b79998fc NF |
795 | args.rets = &args.args[nargs]; |
796 | memset(args.rets, 0, args.nret * sizeof(rtas_arg_t)); | |
797 | ||
91dc182c DB |
798 | /* Need to handle ibm,suspend_me call specially */ |
799 | if (args.token == ibm_suspend_me_token) { | |
800 | rc = rtas_ibm_suspend_me(&args); | |
801 | if (rc) | |
802 | return rc; | |
803 | goto copy_return; | |
804 | } | |
805 | ||
033ef338 | 806 | buff_copy = get_errorlog_buffer(); |
1da177e4 LT |
807 | |
808 | spin_lock_irqsave(&rtas.lock, flags); | |
809 | ||
810 | rtas.args = args; | |
811 | enter_rtas(__pa(&rtas.args)); | |
812 | args = rtas.args; | |
813 | ||
1da177e4 LT |
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 | } |