Commit | Line | Data |
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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> | |
4b16f8e2 | 18 | #include <linux/export.h> |
1da177e4 | 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> | |
95f72d1e | 25 | #include <linux/memblock.h> |
5a0e3ad6 | 26 | #include <linux/slab.h> |
c5f41752 | 27 | #include <linux/reboot.h> |
1da177e4 LT |
28 | |
29 | #include <asm/prom.h> | |
30 | #include <asm/rtas.h> | |
31a7f67e | 31 | #include <asm/hvcall.h> |
1da177e4 | 32 | #include <asm/machdep.h> |
e8222502 | 33 | #include <asm/firmware.h> |
1da177e4 LT |
34 | #include <asm/page.h> |
35 | #include <asm/param.h> | |
1da177e4 LT |
36 | #include <asm/delay.h> |
37 | #include <asm/uaccess.h> | |
296167ae | 38 | #include <asm/udbg.h> |
a7f31841 | 39 | #include <asm/syscalls.h> |
8f5c7579 | 40 | #include <asm/smp.h> |
60063497 | 41 | #include <linux/atomic.h> |
c4007a2f | 42 | #include <asm/time.h> |
46db2f86 | 43 | #include <asm/mmu.h> |
3b7a27db | 44 | #include <asm/topology.h> |
1da177e4 | 45 | |
033ef338 | 46 | struct rtas_t rtas = { |
edc35bd7 | 47 | .lock = __ARCH_SPIN_LOCK_UNLOCKED |
1da177e4 | 48 | }; |
ab3ab74d | 49 | EXPORT_SYMBOL(rtas); |
1da177e4 | 50 | |
1da177e4 | 51 | DEFINE_SPINLOCK(rtas_data_buf_lock); |
ab3ab74d ME |
52 | EXPORT_SYMBOL(rtas_data_buf_lock); |
53 | ||
033ef338 | 54 | char rtas_data_buf[RTAS_DATA_BUF_SIZE] __cacheline_aligned; |
ab3ab74d ME |
55 | EXPORT_SYMBOL(rtas_data_buf); |
56 | ||
1da177e4 LT |
57 | unsigned long rtas_rmo_buf; |
58 | ||
f4fcbbe9 PM |
59 | /* |
60 | * If non-NULL, this gets called when the kernel terminates. | |
61 | * This is done like this so rtas_flash can be a module. | |
62 | */ | |
63 | void (*rtas_flash_term_hook)(int); | |
64 | EXPORT_SYMBOL(rtas_flash_term_hook); | |
65 | ||
f97bb36f BH |
66 | /* RTAS use home made raw locking instead of spin_lock_irqsave |
67 | * because those can be called from within really nasty contexts | |
68 | * such as having the timebase stopped which would lockup with | |
69 | * normal locks and spinlock debugging enabled | |
70 | */ | |
71 | static unsigned long lock_rtas(void) | |
72 | { | |
73 | unsigned long flags; | |
74 | ||
75 | local_irq_save(flags); | |
76 | preempt_disable(); | |
0199c4e6 | 77 | arch_spin_lock_flags(&rtas.lock, flags); |
f97bb36f BH |
78 | return flags; |
79 | } | |
80 | ||
81 | static void unlock_rtas(unsigned long flags) | |
82 | { | |
0199c4e6 | 83 | arch_spin_unlock(&rtas.lock); |
f97bb36f BH |
84 | local_irq_restore(flags); |
85 | preempt_enable(); | |
86 | } | |
87 | ||
033ef338 PM |
88 | /* |
89 | * call_rtas_display_status and call_rtas_display_status_delay | |
90 | * are designed only for very early low-level debugging, which | |
91 | * is why the token is hard-coded to 10. | |
92 | */ | |
296167ae | 93 | static void call_rtas_display_status(char c) |
1da177e4 LT |
94 | { |
95 | struct rtas_args *args = &rtas.args; | |
96 | unsigned long s; | |
97 | ||
98 | if (!rtas.base) | |
99 | return; | |
f97bb36f | 100 | s = lock_rtas(); |
1da177e4 LT |
101 | |
102 | args->token = 10; | |
103 | args->nargs = 1; | |
104 | args->nret = 1; | |
105 | args->rets = (rtas_arg_t *)&(args->args[1]); | |
296167ae | 106 | args->args[0] = (unsigned char)c; |
1da177e4 LT |
107 | |
108 | enter_rtas(__pa(args)); | |
109 | ||
f97bb36f | 110 | unlock_rtas(s); |
1da177e4 LT |
111 | } |
112 | ||
296167ae | 113 | static void call_rtas_display_status_delay(char c) |
1da177e4 LT |
114 | { |
115 | static int pending_newline = 0; /* did last write end with unprinted newline? */ | |
116 | static int width = 16; | |
117 | ||
118 | if (c == '\n') { | |
119 | while (width-- > 0) | |
120 | call_rtas_display_status(' '); | |
121 | width = 16; | |
21fe3301 | 122 | mdelay(500); |
1da177e4 LT |
123 | pending_newline = 1; |
124 | } else { | |
125 | if (pending_newline) { | |
126 | call_rtas_display_status('\r'); | |
127 | call_rtas_display_status('\n'); | |
128 | } | |
129 | pending_newline = 0; | |
130 | if (width--) { | |
131 | call_rtas_display_status(c); | |
132 | udelay(10000); | |
133 | } | |
134 | } | |
135 | } | |
136 | ||
cc46bb98 | 137 | void __init udbg_init_rtas_panel(void) |
296167ae ME |
138 | { |
139 | udbg_putc = call_rtas_display_status_delay; | |
140 | } | |
141 | ||
cc46bb98 ME |
142 | #ifdef CONFIG_UDBG_RTAS_CONSOLE |
143 | ||
144 | /* If you think you're dying before early_init_dt_scan_rtas() does its | |
145 | * work, you can hard code the token values for your firmware here and | |
146 | * hardcode rtas.base/entry etc. | |
147 | */ | |
148 | static unsigned int rtas_putchar_token = RTAS_UNKNOWN_SERVICE; | |
149 | static unsigned int rtas_getchar_token = RTAS_UNKNOWN_SERVICE; | |
150 | ||
151 | static void udbg_rtascon_putc(char c) | |
152 | { | |
153 | int tries; | |
154 | ||
155 | if (!rtas.base) | |
156 | return; | |
157 | ||
158 | /* Add CRs before LFs */ | |
159 | if (c == '\n') | |
160 | udbg_rtascon_putc('\r'); | |
161 | ||
162 | /* if there is more than one character to be displayed, wait a bit */ | |
163 | for (tries = 0; tries < 16; tries++) { | |
164 | if (rtas_call(rtas_putchar_token, 1, 1, NULL, c) == 0) | |
165 | break; | |
166 | udelay(1000); | |
167 | } | |
168 | } | |
169 | ||
170 | static int udbg_rtascon_getc_poll(void) | |
171 | { | |
172 | int c; | |
173 | ||
174 | if (!rtas.base) | |
175 | return -1; | |
176 | ||
177 | if (rtas_call(rtas_getchar_token, 0, 2, &c)) | |
178 | return -1; | |
179 | ||
180 | return c; | |
181 | } | |
182 | ||
183 | static int udbg_rtascon_getc(void) | |
184 | { | |
185 | int c; | |
186 | ||
187 | while ((c = udbg_rtascon_getc_poll()) == -1) | |
188 | ; | |
189 | ||
190 | return c; | |
191 | } | |
192 | ||
193 | ||
194 | void __init udbg_init_rtas_console(void) | |
195 | { | |
196 | udbg_putc = udbg_rtascon_putc; | |
197 | udbg_getc = udbg_rtascon_getc; | |
198 | udbg_getc_poll = udbg_rtascon_getc_poll; | |
199 | } | |
200 | #endif /* CONFIG_UDBG_RTAS_CONSOLE */ | |
201 | ||
033ef338 | 202 | void rtas_progress(char *s, unsigned short hex) |
6566c6f1 AB |
203 | { |
204 | struct device_node *root; | |
a7f67bdf JK |
205 | int width; |
206 | const int *p; | |
6566c6f1 AB |
207 | char *os; |
208 | static int display_character, set_indicator; | |
a7f67bdf | 209 | static int display_width, display_lines, form_feed; |
c5a69d57 | 210 | static const int *row_width; |
6566c6f1 | 211 | static DEFINE_SPINLOCK(progress_lock); |
8f586b22 | 212 | static int current_line; |
6566c6f1 AB |
213 | static int pending_newline = 0; /* did last write end with unprinted newline? */ |
214 | ||
215 | if (!rtas.base) | |
216 | return; | |
217 | ||
8f586b22 MS |
218 | if (display_width == 0) { |
219 | display_width = 0x10; | |
8c8dc322 | 220 | if ((root = of_find_node_by_path("/rtas"))) { |
e2eb6392 | 221 | if ((p = of_get_property(root, |
8f586b22 MS |
222 | "ibm,display-line-length", NULL))) |
223 | display_width = *p; | |
e2eb6392 | 224 | if ((p = of_get_property(root, |
8f586b22 MS |
225 | "ibm,form-feed", NULL))) |
226 | form_feed = *p; | |
e2eb6392 | 227 | if ((p = of_get_property(root, |
8f586b22 MS |
228 | "ibm,display-number-of-lines", NULL))) |
229 | display_lines = *p; | |
e2eb6392 | 230 | row_width = of_get_property(root, |
8f586b22 | 231 | "ibm,display-truncation-length", NULL); |
8c8dc322 | 232 | of_node_put(root); |
8f586b22 | 233 | } |
6566c6f1 AB |
234 | display_character = rtas_token("display-character"); |
235 | set_indicator = rtas_token("set-indicator"); | |
236 | } | |
237 | ||
238 | if (display_character == RTAS_UNKNOWN_SERVICE) { | |
239 | /* use hex display if available */ | |
240 | if (set_indicator != RTAS_UNKNOWN_SERVICE) | |
241 | rtas_call(set_indicator, 3, 1, NULL, 6, 0, hex); | |
242 | return; | |
243 | } | |
244 | ||
245 | spin_lock(&progress_lock); | |
246 | ||
247 | /* | |
248 | * Last write ended with newline, but we didn't print it since | |
249 | * it would just clear the bottom line of output. Print it now | |
250 | * instead. | |
251 | * | |
8f586b22 MS |
252 | * If no newline is pending and form feed is supported, clear the |
253 | * display with a form feed; otherwise, print a CR to start output | |
254 | * at the beginning of the line. | |
6566c6f1 AB |
255 | */ |
256 | if (pending_newline) { | |
257 | rtas_call(display_character, 1, 1, NULL, '\r'); | |
258 | rtas_call(display_character, 1, 1, NULL, '\n'); | |
259 | pending_newline = 0; | |
260 | } else { | |
8f586b22 MS |
261 | current_line = 0; |
262 | if (form_feed) | |
263 | rtas_call(display_character, 1, 1, NULL, | |
264 | (char)form_feed); | |
265 | else | |
266 | rtas_call(display_character, 1, 1, NULL, '\r'); | |
6566c6f1 AB |
267 | } |
268 | ||
8f586b22 MS |
269 | if (row_width) |
270 | width = row_width[current_line]; | |
271 | else | |
272 | width = display_width; | |
6566c6f1 AB |
273 | os = s; |
274 | while (*os) { | |
275 | if (*os == '\n' || *os == '\r') { | |
6566c6f1 AB |
276 | /* If newline is the last character, save it |
277 | * until next call to avoid bumping up the | |
278 | * display output. | |
279 | */ | |
280 | if (*os == '\n' && !os[1]) { | |
281 | pending_newline = 1; | |
8f586b22 MS |
282 | current_line++; |
283 | if (current_line > display_lines-1) | |
284 | current_line = display_lines-1; | |
6566c6f1 AB |
285 | spin_unlock(&progress_lock); |
286 | return; | |
287 | } | |
288 | ||
289 | /* RTAS wants CR-LF, not just LF */ | |
290 | ||
291 | if (*os == '\n') { | |
292 | rtas_call(display_character, 1, 1, NULL, '\r'); | |
293 | rtas_call(display_character, 1, 1, NULL, '\n'); | |
294 | } else { | |
295 | /* CR might be used to re-draw a line, so we'll | |
296 | * leave it alone and not add LF. | |
297 | */ | |
298 | rtas_call(display_character, 1, 1, NULL, *os); | |
299 | } | |
300 | ||
8f586b22 MS |
301 | if (row_width) |
302 | width = row_width[current_line]; | |
303 | else | |
304 | width = display_width; | |
6566c6f1 AB |
305 | } else { |
306 | width--; | |
307 | rtas_call(display_character, 1, 1, NULL, *os); | |
308 | } | |
309 | ||
310 | os++; | |
311 | ||
312 | /* if we overwrite the screen length */ | |
313 | if (width <= 0) | |
314 | while ((*os != 0) && (*os != '\n') && (*os != '\r')) | |
315 | os++; | |
316 | } | |
317 | ||
6566c6f1 AB |
318 | spin_unlock(&progress_lock); |
319 | } | |
f4fcbbe9 | 320 | EXPORT_SYMBOL(rtas_progress); /* needed by rtas_flash module */ |
6566c6f1 | 321 | |
033ef338 | 322 | int rtas_token(const char *service) |
1da177e4 | 323 | { |
a7f67bdf | 324 | const int *tokp; |
033ef338 | 325 | if (rtas.dev == NULL) |
1da177e4 | 326 | return RTAS_UNKNOWN_SERVICE; |
e2eb6392 | 327 | tokp = of_get_property(rtas.dev, service, NULL); |
1da177e4 LT |
328 | return tokp ? *tokp : RTAS_UNKNOWN_SERVICE; |
329 | } | |
ab3ab74d | 330 | EXPORT_SYMBOL(rtas_token); |
1da177e4 | 331 | |
f2d6d2d8 NL |
332 | int rtas_service_present(const char *service) |
333 | { | |
334 | return rtas_token(service) != RTAS_UNKNOWN_SERVICE; | |
335 | } | |
336 | EXPORT_SYMBOL(rtas_service_present); | |
337 | ||
033ef338 | 338 | #ifdef CONFIG_RTAS_ERROR_LOGGING |
1da177e4 LT |
339 | /* |
340 | * Return the firmware-specified size of the error log buffer | |
341 | * for all rtas calls that require an error buffer argument. | |
342 | * This includes 'check-exception' and 'rtas-last-error'. | |
343 | */ | |
344 | int rtas_get_error_log_max(void) | |
345 | { | |
346 | static int rtas_error_log_max; | |
347 | if (rtas_error_log_max) | |
348 | return rtas_error_log_max; | |
349 | ||
350 | rtas_error_log_max = rtas_token ("rtas-error-log-max"); | |
351 | if ((rtas_error_log_max == RTAS_UNKNOWN_SERVICE) || | |
352 | (rtas_error_log_max > RTAS_ERROR_LOG_MAX)) { | |
033ef338 PM |
353 | printk (KERN_WARNING "RTAS: bad log buffer size %d\n", |
354 | rtas_error_log_max); | |
1da177e4 LT |
355 | rtas_error_log_max = RTAS_ERROR_LOG_MAX; |
356 | } | |
357 | return rtas_error_log_max; | |
358 | } | |
033ef338 | 359 | EXPORT_SYMBOL(rtas_get_error_log_max); |
1da177e4 LT |
360 | |
361 | ||
1c21a293 ME |
362 | static char rtas_err_buf[RTAS_ERROR_LOG_MAX]; |
363 | static int rtas_last_error_token; | |
033ef338 | 364 | |
1da177e4 LT |
365 | /** Return a copy of the detailed error text associated with the |
366 | * most recent failed call to rtas. Because the error text | |
367 | * might go stale if there are any other intervening rtas calls, | |
368 | * this routine must be called atomically with whatever produced | |
369 | * the error (i.e. with rtas.lock still held from the previous call). | |
370 | */ | |
033ef338 | 371 | static char *__fetch_rtas_last_error(char *altbuf) |
1da177e4 LT |
372 | { |
373 | struct rtas_args err_args, save_args; | |
374 | u32 bufsz; | |
033ef338 PM |
375 | char *buf = NULL; |
376 | ||
377 | if (rtas_last_error_token == -1) | |
378 | return NULL; | |
1da177e4 LT |
379 | |
380 | bufsz = rtas_get_error_log_max(); | |
381 | ||
033ef338 | 382 | err_args.token = rtas_last_error_token; |
1da177e4 LT |
383 | err_args.nargs = 2; |
384 | err_args.nret = 1; | |
1da177e4 LT |
385 | err_args.args[0] = (rtas_arg_t)__pa(rtas_err_buf); |
386 | err_args.args[1] = bufsz; | |
387 | err_args.args[2] = 0; | |
388 | ||
389 | save_args = rtas.args; | |
390 | rtas.args = err_args; | |
391 | ||
392 | enter_rtas(__pa(&rtas.args)); | |
393 | ||
394 | err_args = rtas.args; | |
395 | rtas.args = save_args; | |
396 | ||
033ef338 PM |
397 | /* Log the error in the unlikely case that there was one. */ |
398 | if (unlikely(err_args.args[2] == 0)) { | |
399 | if (altbuf) { | |
400 | buf = altbuf; | |
401 | } else { | |
402 | buf = rtas_err_buf; | |
403 | if (mem_init_done) | |
404 | buf = kmalloc(RTAS_ERROR_LOG_MAX, GFP_ATOMIC); | |
405 | } | |
406 | if (buf) | |
407 | memcpy(buf, rtas_err_buf, RTAS_ERROR_LOG_MAX); | |
408 | } | |
409 | ||
410 | return buf; | |
1da177e4 LT |
411 | } |
412 | ||
033ef338 PM |
413 | #define get_errorlog_buffer() kmalloc(RTAS_ERROR_LOG_MAX, GFP_KERNEL) |
414 | ||
415 | #else /* CONFIG_RTAS_ERROR_LOGGING */ | |
416 | #define __fetch_rtas_last_error(x) NULL | |
417 | #define get_errorlog_buffer() NULL | |
418 | #endif | |
419 | ||
1da177e4 LT |
420 | int rtas_call(int token, int nargs, int nret, int *outputs, ...) |
421 | { | |
422 | va_list list; | |
033ef338 | 423 | int i; |
1da177e4 LT |
424 | unsigned long s; |
425 | struct rtas_args *rtas_args; | |
033ef338 | 426 | char *buff_copy = NULL; |
1da177e4 LT |
427 | int ret; |
428 | ||
24da3dd5 | 429 | if (!rtas.entry || token == RTAS_UNKNOWN_SERVICE) |
1da177e4 LT |
430 | return -1; |
431 | ||
f97bb36f | 432 | s = lock_rtas(); |
1da177e4 LT |
433 | rtas_args = &rtas.args; |
434 | ||
435 | rtas_args->token = token; | |
436 | rtas_args->nargs = nargs; | |
437 | rtas_args->nret = nret; | |
438 | rtas_args->rets = (rtas_arg_t *)&(rtas_args->args[nargs]); | |
439 | va_start(list, outputs); | |
033ef338 | 440 | for (i = 0; i < nargs; ++i) |
1da177e4 | 441 | rtas_args->args[i] = va_arg(list, rtas_arg_t); |
1da177e4 LT |
442 | va_end(list); |
443 | ||
444 | for (i = 0; i < nret; ++i) | |
445 | rtas_args->rets[i] = 0; | |
446 | ||
1da177e4 | 447 | enter_rtas(__pa(rtas_args)); |
1da177e4 LT |
448 | |
449 | /* A -1 return code indicates that the last command couldn't | |
450 | be completed due to a hardware error. */ | |
451 | if (rtas_args->rets[0] == -1) | |
033ef338 | 452 | buff_copy = __fetch_rtas_last_error(NULL); |
1da177e4 LT |
453 | |
454 | if (nret > 1 && outputs != NULL) | |
455 | for (i = 0; i < nret-1; ++i) | |
456 | outputs[i] = rtas_args->rets[i+1]; | |
457 | ret = (nret > 0)? rtas_args->rets[0]: 0; | |
458 | ||
f97bb36f | 459 | unlock_rtas(s); |
1da177e4 LT |
460 | |
461 | if (buff_copy) { | |
462 | log_error(buff_copy, ERR_TYPE_RTAS_LOG, 0); | |
463 | if (mem_init_done) | |
464 | kfree(buff_copy); | |
465 | } | |
466 | return ret; | |
467 | } | |
ab3ab74d | 468 | EXPORT_SYMBOL(rtas_call); |
1da177e4 | 469 | |
507279db JR |
470 | /* For RTAS_BUSY (-2), delay for 1 millisecond. For an extended busy status |
471 | * code of 990n, perform the hinted delay of 10^n (last digit) milliseconds. | |
1da177e4 | 472 | */ |
507279db | 473 | unsigned int rtas_busy_delay_time(int status) |
1da177e4 | 474 | { |
507279db JR |
475 | int order; |
476 | unsigned int ms = 0; | |
477 | ||
478 | if (status == RTAS_BUSY) { | |
479 | ms = 1; | |
480 | } else if (status >= 9900 && status <= 9905) { | |
481 | order = status - 9900; | |
482 | for (ms = 1; order > 0; order--) | |
483 | ms *= 10; | |
484 | } | |
1da177e4 | 485 | |
507279db JR |
486 | return ms; |
487 | } | |
ab3ab74d | 488 | EXPORT_SYMBOL(rtas_busy_delay_time); |
1da177e4 | 489 | |
507279db JR |
490 | /* For an RTAS busy status code, perform the hinted delay. */ |
491 | unsigned int rtas_busy_delay(int status) | |
492 | { | |
493 | unsigned int ms; | |
1da177e4 | 494 | |
507279db JR |
495 | might_sleep(); |
496 | ms = rtas_busy_delay_time(status); | |
eca590f4 | 497 | if (ms && need_resched()) |
507279db JR |
498 | msleep(ms); |
499 | ||
500 | return ms; | |
1da177e4 | 501 | } |
ab3ab74d | 502 | EXPORT_SYMBOL(rtas_busy_delay); |
1da177e4 | 503 | |
1c21a293 | 504 | static int rtas_error_rc(int rtas_rc) |
1da177e4 LT |
505 | { |
506 | int rc; | |
507 | ||
508 | switch (rtas_rc) { | |
509 | case -1: /* Hardware Error */ | |
510 | rc = -EIO; | |
511 | break; | |
512 | case -3: /* Bad indicator/domain/etc */ | |
513 | rc = -EINVAL; | |
514 | break; | |
515 | case -9000: /* Isolation error */ | |
516 | rc = -EFAULT; | |
517 | break; | |
518 | case -9001: /* Outstanding TCE/PTE */ | |
519 | rc = -EEXIST; | |
520 | break; | |
521 | case -9002: /* No usable slot */ | |
522 | rc = -ENODEV; | |
523 | break; | |
524 | default: | |
525 | printk(KERN_ERR "%s: unexpected RTAS error %d\n", | |
e48b1b45 | 526 | __func__, rtas_rc); |
1da177e4 LT |
527 | rc = -ERANGE; |
528 | break; | |
529 | } | |
530 | return rc; | |
531 | } | |
532 | ||
533 | int rtas_get_power_level(int powerdomain, int *level) | |
534 | { | |
535 | int token = rtas_token("get-power-level"); | |
536 | int rc; | |
537 | ||
538 | if (token == RTAS_UNKNOWN_SERVICE) | |
539 | return -ENOENT; | |
540 | ||
541 | while ((rc = rtas_call(token, 1, 2, level, powerdomain)) == RTAS_BUSY) | |
542 | udelay(1); | |
543 | ||
544 | if (rc < 0) | |
545 | return rtas_error_rc(rc); | |
546 | return rc; | |
547 | } | |
ab3ab74d | 548 | EXPORT_SYMBOL(rtas_get_power_level); |
1da177e4 LT |
549 | |
550 | int rtas_set_power_level(int powerdomain, int level, int *setlevel) | |
551 | { | |
552 | int token = rtas_token("set-power-level"); | |
1da177e4 LT |
553 | int rc; |
554 | ||
555 | if (token == RTAS_UNKNOWN_SERVICE) | |
556 | return -ENOENT; | |
557 | ||
507279db | 558 | do { |
1da177e4 | 559 | rc = rtas_call(token, 2, 2, setlevel, powerdomain, level); |
507279db | 560 | } while (rtas_busy_delay(rc)); |
1da177e4 LT |
561 | |
562 | if (rc < 0) | |
563 | return rtas_error_rc(rc); | |
564 | return rc; | |
565 | } | |
ab3ab74d | 566 | EXPORT_SYMBOL(rtas_set_power_level); |
1da177e4 LT |
567 | |
568 | int rtas_get_sensor(int sensor, int index, int *state) | |
569 | { | |
570 | int token = rtas_token("get-sensor-state"); | |
1da177e4 LT |
571 | int rc; |
572 | ||
573 | if (token == RTAS_UNKNOWN_SERVICE) | |
574 | return -ENOENT; | |
575 | ||
507279db | 576 | do { |
1da177e4 | 577 | rc = rtas_call(token, 2, 2, state, sensor, index); |
507279db | 578 | } while (rtas_busy_delay(rc)); |
1da177e4 LT |
579 | |
580 | if (rc < 0) | |
581 | return rtas_error_rc(rc); | |
582 | return rc; | |
583 | } | |
ab3ab74d | 584 | EXPORT_SYMBOL(rtas_get_sensor); |
1da177e4 | 585 | |
edc72ac4 NL |
586 | bool rtas_indicator_present(int token, int *maxindex) |
587 | { | |
588 | int proplen, count, i; | |
589 | const struct indicator_elem { | |
590 | u32 token; | |
591 | u32 maxindex; | |
592 | } *indicators; | |
593 | ||
594 | indicators = of_get_property(rtas.dev, "rtas-indicators", &proplen); | |
595 | if (!indicators) | |
596 | return false; | |
597 | ||
598 | count = proplen / sizeof(struct indicator_elem); | |
599 | ||
600 | for (i = 0; i < count; i++) { | |
601 | if (indicators[i].token != token) | |
602 | continue; | |
603 | if (maxindex) | |
604 | *maxindex = indicators[i].maxindex; | |
605 | return true; | |
606 | } | |
607 | ||
608 | return false; | |
609 | } | |
610 | EXPORT_SYMBOL(rtas_indicator_present); | |
611 | ||
1da177e4 LT |
612 | int rtas_set_indicator(int indicator, int index, int new_value) |
613 | { | |
614 | int token = rtas_token("set-indicator"); | |
1da177e4 LT |
615 | int rc; |
616 | ||
617 | if (token == RTAS_UNKNOWN_SERVICE) | |
618 | return -ENOENT; | |
619 | ||
507279db | 620 | do { |
1da177e4 | 621 | rc = rtas_call(token, 3, 1, NULL, indicator, index, new_value); |
507279db | 622 | } while (rtas_busy_delay(rc)); |
1da177e4 LT |
623 | |
624 | if (rc < 0) | |
625 | return rtas_error_rc(rc); | |
626 | return rc; | |
627 | } | |
ab3ab74d | 628 | EXPORT_SYMBOL(rtas_set_indicator); |
1da177e4 | 629 | |
81b73dd9 HM |
630 | /* |
631 | * Ignoring RTAS extended delay | |
632 | */ | |
633 | int rtas_set_indicator_fast(int indicator, int index, int new_value) | |
634 | { | |
635 | int rc; | |
636 | int token = rtas_token("set-indicator"); | |
637 | ||
638 | if (token == RTAS_UNKNOWN_SERVICE) | |
639 | return -ENOENT; | |
640 | ||
641 | rc = rtas_call(token, 3, 1, NULL, indicator, index, new_value); | |
642 | ||
643 | WARN_ON(rc == -2 || (rc >= 9900 && rc <= 9905)); | |
644 | ||
645 | if (rc < 0) | |
646 | return rtas_error_rc(rc); | |
647 | ||
648 | return rc; | |
649 | } | |
650 | ||
033ef338 | 651 | void rtas_restart(char *cmd) |
1da177e4 | 652 | { |
f4fcbbe9 PM |
653 | if (rtas_flash_term_hook) |
654 | rtas_flash_term_hook(SYS_RESTART); | |
1da177e4 LT |
655 | printk("RTAS system-reboot returned %d\n", |
656 | rtas_call(rtas_token("system-reboot"), 0, 1, NULL)); | |
657 | for (;;); | |
658 | } | |
659 | ||
033ef338 | 660 | void rtas_power_off(void) |
1da177e4 | 661 | { |
f4fcbbe9 PM |
662 | if (rtas_flash_term_hook) |
663 | rtas_flash_term_hook(SYS_POWER_OFF); | |
1da177e4 LT |
664 | /* allow power on only with power button press */ |
665 | printk("RTAS power-off returned %d\n", | |
666 | rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1)); | |
667 | for (;;); | |
668 | } | |
669 | ||
033ef338 | 670 | void rtas_halt(void) |
1da177e4 | 671 | { |
f4fcbbe9 PM |
672 | if (rtas_flash_term_hook) |
673 | rtas_flash_term_hook(SYS_HALT); | |
674 | /* allow power on only with power button press */ | |
675 | printk("RTAS power-off returned %d\n", | |
676 | rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1)); | |
677 | for (;;); | |
1da177e4 LT |
678 | } |
679 | ||
680 | /* Must be in the RMO region, so we place it here */ | |
681 | static char rtas_os_term_buf[2048]; | |
682 | ||
8f515061 | 683 | void rtas_os_term(char *str) |
a2b51812 LV |
684 | { |
685 | int status; | |
39ed2fe6 | 686 | |
e9bbc8cd AB |
687 | /* |
688 | * Firmware with the ibm,extended-os-term property is guaranteed | |
689 | * to always return from an ibm,os-term call. Earlier versions without | |
690 | * this property may terminate the partition which we want to avoid | |
691 | * since it interferes with panic_timeout. | |
692 | */ | |
693 | if (RTAS_UNKNOWN_SERVICE == rtas_token("ibm,os-term") || | |
694 | RTAS_UNKNOWN_SERVICE == rtas_token("ibm,extended-os-term")) | |
1da177e4 LT |
695 | return; |
696 | ||
8f515061 PM |
697 | snprintf(rtas_os_term_buf, 2048, "OS panic: %s", str); |
698 | ||
1da177e4 LT |
699 | do { |
700 | status = rtas_call(rtas_token("ibm,os-term"), 1, 1, NULL, | |
701 | __pa(rtas_os_term_buf)); | |
507279db | 702 | } while (rtas_busy_delay(status)); |
1da177e4 | 703 | |
507279db | 704 | if (status != 0) |
e9bbc8cd | 705 | printk(KERN_EMERG "ibm,os-term call failed %d\n", status); |
1da177e4 LT |
706 | } |
707 | ||
91dc182c DB |
708 | static int ibm_suspend_me_token = RTAS_UNKNOWN_SERVICE; |
709 | #ifdef CONFIG_PPC_PSERIES | |
8fe93f8d BK |
710 | static int __rtas_suspend_last_cpu(struct rtas_suspend_me_data *data, int wake_when_done) |
711 | { | |
712 | u16 slb_size = mmu_slb_size; | |
713 | int rc = H_MULTI_THREADS_ACTIVE; | |
714 | int cpu; | |
715 | ||
716 | slb_set_size(SLB_MIN_SIZE); | |
717 | printk(KERN_DEBUG "calling ibm,suspend-me on cpu %i\n", smp_processor_id()); | |
718 | ||
719 | while (rc == H_MULTI_THREADS_ACTIVE && !atomic_read(&data->done) && | |
720 | !atomic_read(&data->error)) | |
721 | rc = rtas_call(data->token, 0, 1, NULL); | |
722 | ||
723 | if (rc || atomic_read(&data->error)) { | |
724 | printk(KERN_DEBUG "ibm,suspend-me returned %d\n", rc); | |
725 | slb_set_size(slb_size); | |
726 | } | |
727 | ||
728 | if (atomic_read(&data->error)) | |
729 | rc = atomic_read(&data->error); | |
730 | ||
731 | atomic_set(&data->error, rc); | |
9ee820fa | 732 | pSeries_coalesce_init(); |
8fe93f8d BK |
733 | |
734 | if (wake_when_done) { | |
735 | atomic_set(&data->done, 1); | |
736 | ||
737 | for_each_online_cpu(cpu) | |
738 | plpar_hcall_norets(H_PROD, get_hard_smp_processor_id(cpu)); | |
739 | } | |
740 | ||
741 | if (atomic_dec_return(&data->working) == 0) | |
742 | complete(data->complete); | |
743 | ||
744 | return rc; | |
745 | } | |
746 | ||
747 | int rtas_suspend_last_cpu(struct rtas_suspend_me_data *data) | |
748 | { | |
749 | atomic_inc(&data->working); | |
750 | return __rtas_suspend_last_cpu(data, 0); | |
751 | } | |
752 | ||
753 | static int __rtas_suspend_cpu(struct rtas_suspend_me_data *data, int wake_when_done) | |
91dc182c | 754 | { |
f52862f4 | 755 | long rc = H_SUCCESS; |
8f5c7579 NL |
756 | unsigned long msr_save; |
757 | int cpu; | |
91dc182c | 758 | |
8f5c7579 NL |
759 | atomic_inc(&data->working); |
760 | ||
761 | /* really need to ensure MSR.EE is off for H_JOIN */ | |
762 | msr_save = mfmsr(); | |
763 | mtmsr(msr_save & ~(MSR_EE)); | |
764 | ||
8fe93f8d | 765 | while (rc == H_SUCCESS && !atomic_read(&data->done) && !atomic_read(&data->error)) |
f52862f4 | 766 | rc = plpar_hcall_norets(H_JOIN); |
8f5c7579 NL |
767 | |
768 | mtmsr(msr_save); | |
91dc182c | 769 | |
8f5c7579 NL |
770 | if (rc == H_SUCCESS) { |
771 | /* This cpu was prodded and the suspend is complete. */ | |
772 | goto out; | |
773 | } else if (rc == H_CONTINUE) { | |
774 | /* All other cpus are in H_JOIN, this cpu does | |
775 | * the suspend. | |
776 | */ | |
8fe93f8d | 777 | return __rtas_suspend_last_cpu(data, wake_when_done); |
91dc182c | 778 | } else { |
8f5c7579 NL |
779 | printk(KERN_ERR "H_JOIN on cpu %i failed with rc = %ld\n", |
780 | smp_processor_id(), rc); | |
8fe93f8d | 781 | atomic_set(&data->error, rc); |
91dc182c | 782 | } |
f52862f4 | 783 | |
8fe93f8d BK |
784 | if (wake_when_done) { |
785 | atomic_set(&data->done, 1); | |
f52862f4 | 786 | |
8fe93f8d BK |
787 | /* This cpu did the suspend or got an error; in either case, |
788 | * we need to prod all other other cpus out of join state. | |
789 | * Extra prods are harmless. | |
790 | */ | |
791 | for_each_online_cpu(cpu) | |
792 | plpar_hcall_norets(H_PROD, get_hard_smp_processor_id(cpu)); | |
793 | } | |
91dc182c | 794 | out: |
8f5c7579 NL |
795 | if (atomic_dec_return(&data->working) == 0) |
796 | complete(data->complete); | |
8fe93f8d BK |
797 | return rc; |
798 | } | |
799 | ||
800 | int rtas_suspend_cpu(struct rtas_suspend_me_data *data) | |
801 | { | |
802 | return __rtas_suspend_cpu(data, 0); | |
803 | } | |
804 | ||
805 | static void rtas_percpu_suspend_me(void *info) | |
806 | { | |
807 | __rtas_suspend_cpu((struct rtas_suspend_me_data *)info, 1); | |
91dc182c DB |
808 | } |
809 | ||
d8862be1 | 810 | int rtas_ibm_suspend_me(struct rtas_args *args) |
91dc182c | 811 | { |
368a6ba5 DB |
812 | long state; |
813 | long rc; | |
b9377ffc | 814 | unsigned long retbuf[PLPAR_HCALL_BUFSIZE]; |
91dc182c | 815 | struct rtas_suspend_me_data data; |
8f5c7579 NL |
816 | DECLARE_COMPLETION_ONSTACK(done); |
817 | ||
818 | if (!rtas_service_present("ibm,suspend-me")) | |
819 | return -ENOSYS; | |
91dc182c | 820 | |
368a6ba5 | 821 | /* Make sure the state is valid */ |
b9377ffc AB |
822 | rc = plpar_hcall(H_VASI_STATE, retbuf, |
823 | ((u64)args->args[0] << 32) | args->args[1]); | |
824 | ||
825 | state = retbuf[0]; | |
368a6ba5 DB |
826 | |
827 | if (rc) { | |
828 | printk(KERN_ERR "rtas_ibm_suspend_me: vasi_state returned %ld\n",rc); | |
829 | return rc; | |
830 | } else if (state == H_VASI_ENABLED) { | |
831 | args->args[args->nargs] = RTAS_NOT_SUSPENDABLE; | |
832 | return 0; | |
833 | } else if (state != H_VASI_SUSPENDING) { | |
834 | printk(KERN_ERR "rtas_ibm_suspend_me: vasi_state returned state %ld\n", | |
835 | state); | |
836 | args->args[args->nargs] = -1; | |
837 | return 0; | |
838 | } | |
839 | ||
8f5c7579 | 840 | atomic_set(&data.working, 0); |
f52862f4 | 841 | atomic_set(&data.done, 0); |
8fe93f8d | 842 | atomic_set(&data.error, 0); |
8f5c7579 | 843 | data.token = rtas_token("ibm,suspend-me"); |
8f5c7579 | 844 | data.complete = &done; |
444080d1 | 845 | stop_topology_update(); |
91dc182c DB |
846 | |
847 | /* Call function on all CPUs. One of us will make the | |
848 | * rtas call | |
849 | */ | |
15c8b6c1 | 850 | if (on_each_cpu(rtas_percpu_suspend_me, &data, 0)) |
8fe93f8d | 851 | atomic_set(&data.error, -EINVAL); |
91dc182c | 852 | |
8f5c7579 | 853 | wait_for_completion(&done); |
91dc182c | 854 | |
8fe93f8d | 855 | if (atomic_read(&data.error) != 0) |
8f5c7579 | 856 | printk(KERN_ERR "Error doing global join\n"); |
91dc182c | 857 | |
444080d1 BK |
858 | start_topology_update(); |
859 | ||
8fe93f8d | 860 | return atomic_read(&data.error); |
91dc182c DB |
861 | } |
862 | #else /* CONFIG_PPC_PSERIES */ | |
d8862be1 | 863 | int rtas_ibm_suspend_me(struct rtas_args *args) |
91dc182c DB |
864 | { |
865 | return -ENOSYS; | |
866 | } | |
867 | #endif | |
1da177e4 | 868 | |
6431f208 AB |
869 | /** |
870 | * Find a specific pseries error log in an RTAS extended event log. | |
871 | * @log: RTAS error/event log | |
872 | * @section_id: two character section identifier | |
873 | * | |
874 | * Returns a pointer to the specified errorlog or NULL if not found. | |
875 | */ | |
876 | struct pseries_errorlog *get_pseries_errorlog(struct rtas_error_log *log, | |
877 | uint16_t section_id) | |
878 | { | |
879 | struct rtas_ext_event_log_v6 *ext_log = | |
880 | (struct rtas_ext_event_log_v6 *)log->buffer; | |
881 | struct pseries_errorlog *sect; | |
882 | unsigned char *p, *log_end; | |
883 | ||
884 | /* Check that we understand the format */ | |
885 | if (log->extended_log_length < sizeof(struct rtas_ext_event_log_v6) || | |
886 | ext_log->log_format != RTAS_V6EXT_LOG_FORMAT_EVENT_LOG || | |
887 | ext_log->company_id != RTAS_V6EXT_COMPANY_ID_IBM) | |
888 | return NULL; | |
889 | ||
890 | log_end = log->buffer + log->extended_log_length; | |
891 | p = ext_log->vendor_log; | |
892 | ||
893 | while (p < log_end) { | |
894 | sect = (struct pseries_errorlog *)p; | |
895 | if (sect->id == section_id) | |
896 | return sect; | |
897 | p += sect->length; | |
898 | } | |
899 | ||
900 | return NULL; | |
901 | } | |
902 | ||
1da177e4 LT |
903 | asmlinkage int ppc_rtas(struct rtas_args __user *uargs) |
904 | { | |
905 | struct rtas_args args; | |
906 | unsigned long flags; | |
033ef338 | 907 | char *buff_copy, *errbuf = NULL; |
1da177e4 | 908 | int nargs; |
91dc182c | 909 | int rc; |
1da177e4 LT |
910 | |
911 | if (!capable(CAP_SYS_ADMIN)) | |
912 | return -EPERM; | |
913 | ||
914 | if (copy_from_user(&args, uargs, 3 * sizeof(u32)) != 0) | |
915 | return -EFAULT; | |
916 | ||
917 | nargs = args.nargs; | |
918 | if (nargs > ARRAY_SIZE(args.args) | |
919 | || args.nret > ARRAY_SIZE(args.args) | |
920 | || nargs + args.nret > ARRAY_SIZE(args.args)) | |
921 | return -EINVAL; | |
922 | ||
923 | /* Copy in args. */ | |
924 | if (copy_from_user(args.args, uargs->args, | |
925 | nargs * sizeof(rtas_arg_t)) != 0) | |
926 | return -EFAULT; | |
927 | ||
91dc182c DB |
928 | if (args.token == RTAS_UNKNOWN_SERVICE) |
929 | return -EINVAL; | |
930 | ||
b79998fc NF |
931 | args.rets = &args.args[nargs]; |
932 | memset(args.rets, 0, args.nret * sizeof(rtas_arg_t)); | |
933 | ||
91dc182c DB |
934 | /* Need to handle ibm,suspend_me call specially */ |
935 | if (args.token == ibm_suspend_me_token) { | |
936 | rc = rtas_ibm_suspend_me(&args); | |
937 | if (rc) | |
938 | return rc; | |
939 | goto copy_return; | |
940 | } | |
941 | ||
033ef338 | 942 | buff_copy = get_errorlog_buffer(); |
1da177e4 | 943 | |
f97bb36f | 944 | flags = lock_rtas(); |
1da177e4 LT |
945 | |
946 | rtas.args = args; | |
947 | enter_rtas(__pa(&rtas.args)); | |
948 | args = rtas.args; | |
949 | ||
1da177e4 LT |
950 | /* A -1 return code indicates that the last command couldn't |
951 | be completed due to a hardware error. */ | |
033ef338 PM |
952 | if (args.rets[0] == -1) |
953 | errbuf = __fetch_rtas_last_error(buff_copy); | |
1da177e4 | 954 | |
f97bb36f | 955 | unlock_rtas(flags); |
1da177e4 LT |
956 | |
957 | if (buff_copy) { | |
033ef338 PM |
958 | if (errbuf) |
959 | log_error(errbuf, ERR_TYPE_RTAS_LOG, 0); | |
1da177e4 LT |
960 | kfree(buff_copy); |
961 | } | |
962 | ||
91dc182c | 963 | copy_return: |
1da177e4 LT |
964 | /* Copy out args. */ |
965 | if (copy_to_user(uargs->args + nargs, | |
966 | args.args + nargs, | |
967 | args.nret * sizeof(rtas_arg_t)) != 0) | |
968 | return -EFAULT; | |
969 | ||
970 | return 0; | |
971 | } | |
972 | ||
1da177e4 | 973 | /* |
943ffb58 | 974 | * Call early during boot, before mem init or bootmem, to retrieve the RTAS |
1da177e4 LT |
975 | * informations from the device-tree and allocate the RMO buffer for userland |
976 | * accesses. | |
977 | */ | |
978 | void __init rtas_initialize(void) | |
979 | { | |
033ef338 PM |
980 | unsigned long rtas_region = RTAS_INSTANTIATE_MAX; |
981 | ||
1da177e4 LT |
982 | /* Get RTAS dev node and fill up our "rtas" structure with infos |
983 | * about it. | |
984 | */ | |
985 | rtas.dev = of_find_node_by_name(NULL, "rtas"); | |
986 | if (rtas.dev) { | |
a7f67bdf | 987 | const u32 *basep, *entryp, *sizep; |
1da177e4 | 988 | |
e2eb6392 SR |
989 | basep = of_get_property(rtas.dev, "linux,rtas-base", NULL); |
990 | sizep = of_get_property(rtas.dev, "rtas-size", NULL); | |
1da177e4 LT |
991 | if (basep != NULL && sizep != NULL) { |
992 | rtas.base = *basep; | |
993 | rtas.size = *sizep; | |
e2eb6392 | 994 | entryp = of_get_property(rtas.dev, |
a7f67bdf | 995 | "linux,rtas-entry", NULL); |
1da177e4 LT |
996 | if (entryp == NULL) /* Ugh */ |
997 | rtas.entry = rtas.base; | |
998 | else | |
999 | rtas.entry = *entryp; | |
1000 | } else | |
1001 | rtas.dev = NULL; | |
1002 | } | |
033ef338 PM |
1003 | if (!rtas.dev) |
1004 | return; | |
1005 | ||
1da177e4 LT |
1006 | /* If RTAS was found, allocate the RMO buffer for it and look for |
1007 | * the stop-self token if any | |
1008 | */ | |
033ef338 | 1009 | #ifdef CONFIG_PPC64 |
e8222502 | 1010 | if (machine_is(pseries) && firmware_has_feature(FW_FEATURE_LPAR)) { |
cd3db0c4 | 1011 | rtas_region = min(ppc64_rma_size, RTAS_INSTANTIATE_MAX); |
91dc182c DB |
1012 | ibm_suspend_me_token = rtas_token("ibm,suspend-me"); |
1013 | } | |
033ef338 | 1014 | #endif |
95f72d1e | 1015 | rtas_rmo_buf = memblock_alloc_base(RTAS_RMOBUF_MAX, PAGE_SIZE, rtas_region); |
1da177e4 | 1016 | |
033ef338 PM |
1017 | #ifdef CONFIG_RTAS_ERROR_LOGGING |
1018 | rtas_last_error_token = rtas_token("rtas-last-error"); | |
1019 | #endif | |
1da177e4 | 1020 | } |
458148c0 ME |
1021 | |
1022 | int __init early_init_dt_scan_rtas(unsigned long node, | |
1023 | const char *uname, int depth, void *data) | |
1024 | { | |
1025 | u32 *basep, *entryp, *sizep; | |
1026 | ||
1027 | if (depth != 1 || strcmp(uname, "rtas") != 0) | |
1028 | return 0; | |
1029 | ||
1030 | basep = of_get_flat_dt_prop(node, "linux,rtas-base", NULL); | |
1031 | entryp = of_get_flat_dt_prop(node, "linux,rtas-entry", NULL); | |
1032 | sizep = of_get_flat_dt_prop(node, "rtas-size", NULL); | |
1033 | ||
1034 | if (basep && entryp && sizep) { | |
1035 | rtas.base = *basep; | |
1036 | rtas.entry = *entryp; | |
1037 | rtas.size = *sizep; | |
1038 | } | |
1039 | ||
cc46bb98 ME |
1040 | #ifdef CONFIG_UDBG_RTAS_CONSOLE |
1041 | basep = of_get_flat_dt_prop(node, "put-term-char", NULL); | |
1042 | if (basep) | |
1043 | rtas_putchar_token = *basep; | |
1044 | ||
1045 | basep = of_get_flat_dt_prop(node, "get-term-char", NULL); | |
1046 | if (basep) | |
1047 | rtas_getchar_token = *basep; | |
9a2ded55 MN |
1048 | |
1049 | if (rtas_putchar_token != RTAS_UNKNOWN_SERVICE && | |
1050 | rtas_getchar_token != RTAS_UNKNOWN_SERVICE) | |
1051 | udbg_init_rtas_console(); | |
1052 | ||
cc46bb98 ME |
1053 | #endif |
1054 | ||
458148c0 ME |
1055 | /* break now */ |
1056 | return 1; | |
1057 | } | |
c4007a2f | 1058 | |
445c8951 | 1059 | static arch_spinlock_t timebase_lock; |
c4007a2f BH |
1060 | static u64 timebase = 0; |
1061 | ||
1062 | void __cpuinit rtas_give_timebase(void) | |
1063 | { | |
1064 | unsigned long flags; | |
1065 | ||
1066 | local_irq_save(flags); | |
1067 | hard_irq_disable(); | |
0199c4e6 | 1068 | arch_spin_lock(&timebase_lock); |
c4007a2f BH |
1069 | rtas_call(rtas_token("freeze-time-base"), 0, 1, NULL); |
1070 | timebase = get_tb(); | |
0199c4e6 | 1071 | arch_spin_unlock(&timebase_lock); |
c4007a2f BH |
1072 | |
1073 | while (timebase) | |
1074 | barrier(); | |
1075 | rtas_call(rtas_token("thaw-time-base"), 0, 1, NULL); | |
1076 | local_irq_restore(flags); | |
1077 | } | |
1078 | ||
1079 | void __cpuinit rtas_take_timebase(void) | |
1080 | { | |
1081 | while (!timebase) | |
1082 | barrier(); | |
0199c4e6 | 1083 | arch_spin_lock(&timebase_lock); |
c4007a2f BH |
1084 | set_tb(timebase >> 32, timebase & 0xffffffff); |
1085 | timebase = 0; | |
0199c4e6 | 1086 | arch_spin_unlock(&timebase_lock); |
c4007a2f | 1087 | } |