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