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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> | |
18 | #include <linux/module.h> | |
19 | #include <linux/init.h> | |
a9415644 | 20 | #include <linux/capability.h> |
21fe3301 | 21 | #include <linux/delay.h> |
1da177e4 LT |
22 | |
23 | #include <asm/prom.h> | |
24 | #include <asm/rtas.h> | |
31a7f67e | 25 | #include <asm/hvcall.h> |
1da177e4 LT |
26 | #include <asm/semaphore.h> |
27 | #include <asm/machdep.h> | |
e8222502 | 28 | #include <asm/firmware.h> |
1da177e4 LT |
29 | #include <asm/page.h> |
30 | #include <asm/param.h> | |
31 | #include <asm/system.h> | |
1da177e4 LT |
32 | #include <asm/delay.h> |
33 | #include <asm/uaccess.h> | |
033ef338 | 34 | #include <asm/lmb.h> |
296167ae | 35 | #include <asm/udbg.h> |
a7f31841 | 36 | #include <asm/syscalls.h> |
1da177e4 | 37 | |
033ef338 | 38 | struct rtas_t rtas = { |
1da177e4 LT |
39 | .lock = SPIN_LOCK_UNLOCKED |
40 | }; | |
ab3ab74d | 41 | EXPORT_SYMBOL(rtas); |
1da177e4 | 42 | |
91dc182c DB |
43 | struct rtas_suspend_me_data { |
44 | long waiting; | |
45 | struct rtas_args *args; | |
46 | }; | |
47 | ||
1da177e4 | 48 | DEFINE_SPINLOCK(rtas_data_buf_lock); |
ab3ab74d ME |
49 | EXPORT_SYMBOL(rtas_data_buf_lock); |
50 | ||
033ef338 | 51 | char rtas_data_buf[RTAS_DATA_BUF_SIZE] __cacheline_aligned; |
ab3ab74d ME |
52 | EXPORT_SYMBOL(rtas_data_buf); |
53 | ||
1da177e4 LT |
54 | unsigned long rtas_rmo_buf; |
55 | ||
f4fcbbe9 PM |
56 | /* |
57 | * If non-NULL, this gets called when the kernel terminates. | |
58 | * This is done like this so rtas_flash can be a module. | |
59 | */ | |
60 | void (*rtas_flash_term_hook)(int); | |
61 | EXPORT_SYMBOL(rtas_flash_term_hook); | |
62 | ||
033ef338 PM |
63 | /* |
64 | * call_rtas_display_status and call_rtas_display_status_delay | |
65 | * are designed only for very early low-level debugging, which | |
66 | * is why the token is hard-coded to 10. | |
67 | */ | |
296167ae | 68 | static void call_rtas_display_status(char c) |
1da177e4 LT |
69 | { |
70 | struct rtas_args *args = &rtas.args; | |
71 | unsigned long s; | |
72 | ||
73 | if (!rtas.base) | |
74 | return; | |
75 | spin_lock_irqsave(&rtas.lock, s); | |
76 | ||
77 | args->token = 10; | |
78 | args->nargs = 1; | |
79 | args->nret = 1; | |
80 | args->rets = (rtas_arg_t *)&(args->args[1]); | |
296167ae | 81 | args->args[0] = (unsigned char)c; |
1da177e4 LT |
82 | |
83 | enter_rtas(__pa(args)); | |
84 | ||
85 | spin_unlock_irqrestore(&rtas.lock, s); | |
86 | } | |
87 | ||
296167ae | 88 | static void call_rtas_display_status_delay(char c) |
1da177e4 LT |
89 | { |
90 | static int pending_newline = 0; /* did last write end with unprinted newline? */ | |
91 | static int width = 16; | |
92 | ||
93 | if (c == '\n') { | |
94 | while (width-- > 0) | |
95 | call_rtas_display_status(' '); | |
96 | width = 16; | |
21fe3301 | 97 | mdelay(500); |
1da177e4 LT |
98 | pending_newline = 1; |
99 | } else { | |
100 | if (pending_newline) { | |
101 | call_rtas_display_status('\r'); | |
102 | call_rtas_display_status('\n'); | |
103 | } | |
104 | pending_newline = 0; | |
105 | if (width--) { | |
106 | call_rtas_display_status(c); | |
107 | udelay(10000); | |
108 | } | |
109 | } | |
110 | } | |
111 | ||
cc46bb98 | 112 | void __init udbg_init_rtas_panel(void) |
296167ae ME |
113 | { |
114 | udbg_putc = call_rtas_display_status_delay; | |
115 | } | |
116 | ||
cc46bb98 ME |
117 | #ifdef CONFIG_UDBG_RTAS_CONSOLE |
118 | ||
119 | /* If you think you're dying before early_init_dt_scan_rtas() does its | |
120 | * work, you can hard code the token values for your firmware here and | |
121 | * hardcode rtas.base/entry etc. | |
122 | */ | |
123 | static unsigned int rtas_putchar_token = RTAS_UNKNOWN_SERVICE; | |
124 | static unsigned int rtas_getchar_token = RTAS_UNKNOWN_SERVICE; | |
125 | ||
126 | static void udbg_rtascon_putc(char c) | |
127 | { | |
128 | int tries; | |
129 | ||
130 | if (!rtas.base) | |
131 | return; | |
132 | ||
133 | /* Add CRs before LFs */ | |
134 | if (c == '\n') | |
135 | udbg_rtascon_putc('\r'); | |
136 | ||
137 | /* if there is more than one character to be displayed, wait a bit */ | |
138 | for (tries = 0; tries < 16; tries++) { | |
139 | if (rtas_call(rtas_putchar_token, 1, 1, NULL, c) == 0) | |
140 | break; | |
141 | udelay(1000); | |
142 | } | |
143 | } | |
144 | ||
145 | static int udbg_rtascon_getc_poll(void) | |
146 | { | |
147 | int c; | |
148 | ||
149 | if (!rtas.base) | |
150 | return -1; | |
151 | ||
152 | if (rtas_call(rtas_getchar_token, 0, 2, &c)) | |
153 | return -1; | |
154 | ||
155 | return c; | |
156 | } | |
157 | ||
158 | static int udbg_rtascon_getc(void) | |
159 | { | |
160 | int c; | |
161 | ||
162 | while ((c = udbg_rtascon_getc_poll()) == -1) | |
163 | ; | |
164 | ||
165 | return c; | |
166 | } | |
167 | ||
168 | ||
169 | void __init udbg_init_rtas_console(void) | |
170 | { | |
171 | udbg_putc = udbg_rtascon_putc; | |
172 | udbg_getc = udbg_rtascon_getc; | |
173 | udbg_getc_poll = udbg_rtascon_getc_poll; | |
174 | } | |
175 | #endif /* CONFIG_UDBG_RTAS_CONSOLE */ | |
176 | ||
033ef338 | 177 | void rtas_progress(char *s, unsigned short hex) |
6566c6f1 AB |
178 | { |
179 | struct device_node *root; | |
180 | int width, *p; | |
181 | char *os; | |
182 | static int display_character, set_indicator; | |
8f586b22 | 183 | static int display_width, display_lines, *row_width, form_feed; |
6566c6f1 | 184 | static DEFINE_SPINLOCK(progress_lock); |
8f586b22 | 185 | static int current_line; |
6566c6f1 AB |
186 | static int pending_newline = 0; /* did last write end with unprinted newline? */ |
187 | ||
188 | if (!rtas.base) | |
189 | return; | |
190 | ||
8f586b22 MS |
191 | if (display_width == 0) { |
192 | display_width = 0x10; | |
193 | if ((root = find_path_device("/rtas"))) { | |
194 | if ((p = (unsigned int *)get_property(root, | |
195 | "ibm,display-line-length", NULL))) | |
196 | display_width = *p; | |
197 | if ((p = (unsigned int *)get_property(root, | |
198 | "ibm,form-feed", NULL))) | |
199 | form_feed = *p; | |
200 | if ((p = (unsigned int *)get_property(root, | |
201 | "ibm,display-number-of-lines", NULL))) | |
202 | display_lines = *p; | |
203 | row_width = (unsigned int *)get_property(root, | |
204 | "ibm,display-truncation-length", NULL); | |
205 | } | |
6566c6f1 AB |
206 | display_character = rtas_token("display-character"); |
207 | set_indicator = rtas_token("set-indicator"); | |
208 | } | |
209 | ||
210 | if (display_character == RTAS_UNKNOWN_SERVICE) { | |
211 | /* use hex display if available */ | |
212 | if (set_indicator != RTAS_UNKNOWN_SERVICE) | |
213 | rtas_call(set_indicator, 3, 1, NULL, 6, 0, hex); | |
214 | return; | |
215 | } | |
216 | ||
217 | spin_lock(&progress_lock); | |
218 | ||
219 | /* | |
220 | * Last write ended with newline, but we didn't print it since | |
221 | * it would just clear the bottom line of output. Print it now | |
222 | * instead. | |
223 | * | |
8f586b22 MS |
224 | * If no newline is pending and form feed is supported, clear the |
225 | * display with a form feed; otherwise, print a CR to start output | |
226 | * at the beginning of the line. | |
6566c6f1 AB |
227 | */ |
228 | if (pending_newline) { | |
229 | rtas_call(display_character, 1, 1, NULL, '\r'); | |
230 | rtas_call(display_character, 1, 1, NULL, '\n'); | |
231 | pending_newline = 0; | |
232 | } else { | |
8f586b22 MS |
233 | current_line = 0; |
234 | if (form_feed) | |
235 | rtas_call(display_character, 1, 1, NULL, | |
236 | (char)form_feed); | |
237 | else | |
238 | rtas_call(display_character, 1, 1, NULL, '\r'); | |
6566c6f1 AB |
239 | } |
240 | ||
8f586b22 MS |
241 | if (row_width) |
242 | width = row_width[current_line]; | |
243 | else | |
244 | width = display_width; | |
6566c6f1 AB |
245 | os = s; |
246 | while (*os) { | |
247 | if (*os == '\n' || *os == '\r') { | |
6566c6f1 AB |
248 | /* If newline is the last character, save it |
249 | * until next call to avoid bumping up the | |
250 | * display output. | |
251 | */ | |
252 | if (*os == '\n' && !os[1]) { | |
253 | pending_newline = 1; | |
8f586b22 MS |
254 | current_line++; |
255 | if (current_line > display_lines-1) | |
256 | current_line = display_lines-1; | |
6566c6f1 AB |
257 | spin_unlock(&progress_lock); |
258 | return; | |
259 | } | |
260 | ||
261 | /* RTAS wants CR-LF, not just LF */ | |
262 | ||
263 | if (*os == '\n') { | |
264 | rtas_call(display_character, 1, 1, NULL, '\r'); | |
265 | rtas_call(display_character, 1, 1, NULL, '\n'); | |
266 | } else { | |
267 | /* CR might be used to re-draw a line, so we'll | |
268 | * leave it alone and not add LF. | |
269 | */ | |
270 | rtas_call(display_character, 1, 1, NULL, *os); | |
271 | } | |
272 | ||
8f586b22 MS |
273 | if (row_width) |
274 | width = row_width[current_line]; | |
275 | else | |
276 | width = display_width; | |
6566c6f1 AB |
277 | } else { |
278 | width--; | |
279 | rtas_call(display_character, 1, 1, NULL, *os); | |
280 | } | |
281 | ||
282 | os++; | |
283 | ||
284 | /* if we overwrite the screen length */ | |
285 | if (width <= 0) | |
286 | while ((*os != 0) && (*os != '\n') && (*os != '\r')) | |
287 | os++; | |
288 | } | |
289 | ||
6566c6f1 AB |
290 | spin_unlock(&progress_lock); |
291 | } | |
f4fcbbe9 | 292 | EXPORT_SYMBOL(rtas_progress); /* needed by rtas_flash module */ |
6566c6f1 | 293 | |
033ef338 | 294 | int rtas_token(const char *service) |
1da177e4 LT |
295 | { |
296 | int *tokp; | |
033ef338 | 297 | if (rtas.dev == NULL) |
1da177e4 | 298 | return RTAS_UNKNOWN_SERVICE; |
1da177e4 LT |
299 | tokp = (int *) get_property(rtas.dev, service, NULL); |
300 | return tokp ? *tokp : RTAS_UNKNOWN_SERVICE; | |
301 | } | |
ab3ab74d | 302 | EXPORT_SYMBOL(rtas_token); |
1da177e4 | 303 | |
033ef338 | 304 | #ifdef CONFIG_RTAS_ERROR_LOGGING |
1da177e4 LT |
305 | /* |
306 | * Return the firmware-specified size of the error log buffer | |
307 | * for all rtas calls that require an error buffer argument. | |
308 | * This includes 'check-exception' and 'rtas-last-error'. | |
309 | */ | |
310 | int rtas_get_error_log_max(void) | |
311 | { | |
312 | static int rtas_error_log_max; | |
313 | if (rtas_error_log_max) | |
314 | return rtas_error_log_max; | |
315 | ||
316 | rtas_error_log_max = rtas_token ("rtas-error-log-max"); | |
317 | if ((rtas_error_log_max == RTAS_UNKNOWN_SERVICE) || | |
318 | (rtas_error_log_max > RTAS_ERROR_LOG_MAX)) { | |
033ef338 PM |
319 | printk (KERN_WARNING "RTAS: bad log buffer size %d\n", |
320 | rtas_error_log_max); | |
1da177e4 LT |
321 | rtas_error_log_max = RTAS_ERROR_LOG_MAX; |
322 | } | |
323 | return rtas_error_log_max; | |
324 | } | |
033ef338 | 325 | EXPORT_SYMBOL(rtas_get_error_log_max); |
1da177e4 LT |
326 | |
327 | ||
033ef338 PM |
328 | char rtas_err_buf[RTAS_ERROR_LOG_MAX]; |
329 | int rtas_last_error_token; | |
330 | ||
1da177e4 LT |
331 | /** Return a copy of the detailed error text associated with the |
332 | * most recent failed call to rtas. Because the error text | |
333 | * might go stale if there are any other intervening rtas calls, | |
334 | * this routine must be called atomically with whatever produced | |
335 | * the error (i.e. with rtas.lock still held from the previous call). | |
336 | */ | |
033ef338 | 337 | static char *__fetch_rtas_last_error(char *altbuf) |
1da177e4 LT |
338 | { |
339 | struct rtas_args err_args, save_args; | |
340 | u32 bufsz; | |
033ef338 PM |
341 | char *buf = NULL; |
342 | ||
343 | if (rtas_last_error_token == -1) | |
344 | return NULL; | |
1da177e4 LT |
345 | |
346 | bufsz = rtas_get_error_log_max(); | |
347 | ||
033ef338 | 348 | err_args.token = rtas_last_error_token; |
1da177e4 LT |
349 | err_args.nargs = 2; |
350 | err_args.nret = 1; | |
1da177e4 LT |
351 | err_args.args[0] = (rtas_arg_t)__pa(rtas_err_buf); |
352 | err_args.args[1] = bufsz; | |
353 | err_args.args[2] = 0; | |
354 | ||
355 | save_args = rtas.args; | |
356 | rtas.args = err_args; | |
357 | ||
358 | enter_rtas(__pa(&rtas.args)); | |
359 | ||
360 | err_args = rtas.args; | |
361 | rtas.args = save_args; | |
362 | ||
033ef338 PM |
363 | /* Log the error in the unlikely case that there was one. */ |
364 | if (unlikely(err_args.args[2] == 0)) { | |
365 | if (altbuf) { | |
366 | buf = altbuf; | |
367 | } else { | |
368 | buf = rtas_err_buf; | |
369 | if (mem_init_done) | |
370 | buf = kmalloc(RTAS_ERROR_LOG_MAX, GFP_ATOMIC); | |
371 | } | |
372 | if (buf) | |
373 | memcpy(buf, rtas_err_buf, RTAS_ERROR_LOG_MAX); | |
374 | } | |
375 | ||
376 | return buf; | |
1da177e4 LT |
377 | } |
378 | ||
033ef338 PM |
379 | #define get_errorlog_buffer() kmalloc(RTAS_ERROR_LOG_MAX, GFP_KERNEL) |
380 | ||
381 | #else /* CONFIG_RTAS_ERROR_LOGGING */ | |
382 | #define __fetch_rtas_last_error(x) NULL | |
383 | #define get_errorlog_buffer() NULL | |
384 | #endif | |
385 | ||
1da177e4 LT |
386 | int rtas_call(int token, int nargs, int nret, int *outputs, ...) |
387 | { | |
388 | va_list list; | |
033ef338 | 389 | int i; |
1da177e4 LT |
390 | unsigned long s; |
391 | struct rtas_args *rtas_args; | |
033ef338 | 392 | char *buff_copy = NULL; |
1da177e4 LT |
393 | int ret; |
394 | ||
24da3dd5 | 395 | if (!rtas.entry || token == RTAS_UNKNOWN_SERVICE) |
1da177e4 LT |
396 | return -1; |
397 | ||
398 | /* Gotta do something different here, use global lock for now... */ | |
399 | spin_lock_irqsave(&rtas.lock, s); | |
400 | rtas_args = &rtas.args; | |
401 | ||
402 | rtas_args->token = token; | |
403 | rtas_args->nargs = nargs; | |
404 | rtas_args->nret = nret; | |
405 | rtas_args->rets = (rtas_arg_t *)&(rtas_args->args[nargs]); | |
406 | va_start(list, outputs); | |
033ef338 | 407 | for (i = 0; i < nargs; ++i) |
1da177e4 | 408 | rtas_args->args[i] = va_arg(list, rtas_arg_t); |
1da177e4 LT |
409 | va_end(list); |
410 | ||
411 | for (i = 0; i < nret; ++i) | |
412 | rtas_args->rets[i] = 0; | |
413 | ||
1da177e4 | 414 | enter_rtas(__pa(rtas_args)); |
1da177e4 LT |
415 | |
416 | /* A -1 return code indicates that the last command couldn't | |
417 | be completed due to a hardware error. */ | |
418 | if (rtas_args->rets[0] == -1) | |
033ef338 | 419 | buff_copy = __fetch_rtas_last_error(NULL); |
1da177e4 LT |
420 | |
421 | if (nret > 1 && outputs != NULL) | |
422 | for (i = 0; i < nret-1; ++i) | |
423 | outputs[i] = rtas_args->rets[i+1]; | |
424 | ret = (nret > 0)? rtas_args->rets[0]: 0; | |
425 | ||
1da177e4 LT |
426 | /* Gotta do something different here, use global lock for now... */ |
427 | spin_unlock_irqrestore(&rtas.lock, s); | |
428 | ||
429 | if (buff_copy) { | |
430 | log_error(buff_copy, ERR_TYPE_RTAS_LOG, 0); | |
431 | if (mem_init_done) | |
432 | kfree(buff_copy); | |
433 | } | |
434 | return ret; | |
435 | } | |
ab3ab74d | 436 | EXPORT_SYMBOL(rtas_call); |
1da177e4 | 437 | |
507279db JR |
438 | /* For RTAS_BUSY (-2), delay for 1 millisecond. For an extended busy status |
439 | * code of 990n, perform the hinted delay of 10^n (last digit) milliseconds. | |
1da177e4 | 440 | */ |
507279db | 441 | unsigned int rtas_busy_delay_time(int status) |
1da177e4 | 442 | { |
507279db JR |
443 | int order; |
444 | unsigned int ms = 0; | |
445 | ||
446 | if (status == RTAS_BUSY) { | |
447 | ms = 1; | |
448 | } else if (status >= 9900 && status <= 9905) { | |
449 | order = status - 9900; | |
450 | for (ms = 1; order > 0; order--) | |
451 | ms *= 10; | |
452 | } | |
1da177e4 | 453 | |
507279db JR |
454 | return ms; |
455 | } | |
ab3ab74d | 456 | EXPORT_SYMBOL(rtas_busy_delay_time); |
1da177e4 | 457 | |
507279db JR |
458 | /* For an RTAS busy status code, perform the hinted delay. */ |
459 | unsigned int rtas_busy_delay(int status) | |
460 | { | |
461 | unsigned int ms; | |
1da177e4 | 462 | |
507279db JR |
463 | might_sleep(); |
464 | ms = rtas_busy_delay_time(status); | |
465 | if (ms) | |
466 | msleep(ms); | |
467 | ||
468 | return ms; | |
1da177e4 | 469 | } |
ab3ab74d | 470 | EXPORT_SYMBOL(rtas_busy_delay); |
1da177e4 LT |
471 | |
472 | int rtas_error_rc(int rtas_rc) | |
473 | { | |
474 | int rc; | |
475 | ||
476 | switch (rtas_rc) { | |
477 | case -1: /* Hardware Error */ | |
478 | rc = -EIO; | |
479 | break; | |
480 | case -3: /* Bad indicator/domain/etc */ | |
481 | rc = -EINVAL; | |
482 | break; | |
483 | case -9000: /* Isolation error */ | |
484 | rc = -EFAULT; | |
485 | break; | |
486 | case -9001: /* Outstanding TCE/PTE */ | |
487 | rc = -EEXIST; | |
488 | break; | |
489 | case -9002: /* No usable slot */ | |
490 | rc = -ENODEV; | |
491 | break; | |
492 | default: | |
493 | printk(KERN_ERR "%s: unexpected RTAS error %d\n", | |
494 | __FUNCTION__, rtas_rc); | |
495 | rc = -ERANGE; | |
496 | break; | |
497 | } | |
498 | return rc; | |
499 | } | |
500 | ||
501 | int rtas_get_power_level(int powerdomain, int *level) | |
502 | { | |
503 | int token = rtas_token("get-power-level"); | |
504 | int rc; | |
505 | ||
506 | if (token == RTAS_UNKNOWN_SERVICE) | |
507 | return -ENOENT; | |
508 | ||
509 | while ((rc = rtas_call(token, 1, 2, level, powerdomain)) == RTAS_BUSY) | |
510 | udelay(1); | |
511 | ||
512 | if (rc < 0) | |
513 | return rtas_error_rc(rc); | |
514 | return rc; | |
515 | } | |
ab3ab74d | 516 | EXPORT_SYMBOL(rtas_get_power_level); |
1da177e4 LT |
517 | |
518 | int rtas_set_power_level(int powerdomain, int level, int *setlevel) | |
519 | { | |
520 | int token = rtas_token("set-power-level"); | |
1da177e4 LT |
521 | int rc; |
522 | ||
523 | if (token == RTAS_UNKNOWN_SERVICE) | |
524 | return -ENOENT; | |
525 | ||
507279db | 526 | do { |
1da177e4 | 527 | rc = rtas_call(token, 2, 2, setlevel, powerdomain, level); |
507279db | 528 | } while (rtas_busy_delay(rc)); |
1da177e4 LT |
529 | |
530 | if (rc < 0) | |
531 | return rtas_error_rc(rc); | |
532 | return rc; | |
533 | } | |
ab3ab74d | 534 | EXPORT_SYMBOL(rtas_set_power_level); |
1da177e4 LT |
535 | |
536 | int rtas_get_sensor(int sensor, int index, int *state) | |
537 | { | |
538 | int token = rtas_token("get-sensor-state"); | |
1da177e4 LT |
539 | int rc; |
540 | ||
541 | if (token == RTAS_UNKNOWN_SERVICE) | |
542 | return -ENOENT; | |
543 | ||
507279db | 544 | do { |
1da177e4 | 545 | rc = rtas_call(token, 2, 2, state, sensor, index); |
507279db | 546 | } while (rtas_busy_delay(rc)); |
1da177e4 LT |
547 | |
548 | if (rc < 0) | |
549 | return rtas_error_rc(rc); | |
550 | return rc; | |
551 | } | |
ab3ab74d | 552 | EXPORT_SYMBOL(rtas_get_sensor); |
1da177e4 LT |
553 | |
554 | int rtas_set_indicator(int indicator, int index, int new_value) | |
555 | { | |
556 | int token = rtas_token("set-indicator"); | |
1da177e4 LT |
557 | int rc; |
558 | ||
559 | if (token == RTAS_UNKNOWN_SERVICE) | |
560 | return -ENOENT; | |
561 | ||
507279db | 562 | do { |
1da177e4 | 563 | rc = rtas_call(token, 3, 1, NULL, indicator, index, new_value); |
507279db | 564 | } while (rtas_busy_delay(rc)); |
1da177e4 LT |
565 | |
566 | if (rc < 0) | |
567 | return rtas_error_rc(rc); | |
568 | return rc; | |
569 | } | |
ab3ab74d | 570 | EXPORT_SYMBOL(rtas_set_indicator); |
1da177e4 | 571 | |
033ef338 | 572 | void rtas_restart(char *cmd) |
1da177e4 | 573 | { |
f4fcbbe9 PM |
574 | if (rtas_flash_term_hook) |
575 | rtas_flash_term_hook(SYS_RESTART); | |
1da177e4 LT |
576 | printk("RTAS system-reboot returned %d\n", |
577 | rtas_call(rtas_token("system-reboot"), 0, 1, NULL)); | |
578 | for (;;); | |
579 | } | |
580 | ||
033ef338 | 581 | void rtas_power_off(void) |
1da177e4 | 582 | { |
f4fcbbe9 PM |
583 | if (rtas_flash_term_hook) |
584 | rtas_flash_term_hook(SYS_POWER_OFF); | |
1da177e4 LT |
585 | /* allow power on only with power button press */ |
586 | printk("RTAS power-off returned %d\n", | |
587 | rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1)); | |
588 | for (;;); | |
589 | } | |
590 | ||
033ef338 | 591 | void rtas_halt(void) |
1da177e4 | 592 | { |
f4fcbbe9 PM |
593 | if (rtas_flash_term_hook) |
594 | rtas_flash_term_hook(SYS_HALT); | |
595 | /* allow power on only with power button press */ | |
596 | printk("RTAS power-off returned %d\n", | |
597 | rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1)); | |
598 | for (;;); | |
1da177e4 LT |
599 | } |
600 | ||
601 | /* Must be in the RMO region, so we place it here */ | |
602 | static char rtas_os_term_buf[2048]; | |
603 | ||
604 | void rtas_os_term(char *str) | |
605 | { | |
606 | int status; | |
607 | ||
608 | if (RTAS_UNKNOWN_SERVICE == rtas_token("ibm,os-term")) | |
609 | return; | |
610 | ||
611 | snprintf(rtas_os_term_buf, 2048, "OS panic: %s", str); | |
612 | ||
613 | do { | |
614 | status = rtas_call(rtas_token("ibm,os-term"), 1, 1, NULL, | |
615 | __pa(rtas_os_term_buf)); | |
507279db | 616 | } while (rtas_busy_delay(status)); |
1da177e4 | 617 | |
507279db JR |
618 | if (status != 0) |
619 | printk(KERN_EMERG "ibm,os-term call failed %d\n", | |
1da177e4 | 620 | status); |
1da177e4 LT |
621 | } |
622 | ||
91dc182c DB |
623 | static int ibm_suspend_me_token = RTAS_UNKNOWN_SERVICE; |
624 | #ifdef CONFIG_PPC_PSERIES | |
625 | static void rtas_percpu_suspend_me(void *info) | |
626 | { | |
82a4df74 | 627 | int i; |
91dc182c DB |
628 | long rc; |
629 | long flags; | |
630 | struct rtas_suspend_me_data *data = | |
631 | (struct rtas_suspend_me_data *)info; | |
632 | ||
633 | /* | |
634 | * We use "waiting" to indicate our state. As long | |
635 | * as it is >0, we are still trying to all join up. | |
636 | * If it goes to 0, we have successfully joined up and | |
706c8c93 | 637 | * one thread got H_CONTINUE. If any error happens, |
91dc182c DB |
638 | * we set it to <0. |
639 | */ | |
640 | local_irq_save(flags); | |
641 | do { | |
642 | rc = plpar_hcall_norets(H_JOIN); | |
643 | smp_rmb(); | |
706c8c93 SB |
644 | } while (rc == H_SUCCESS && data->waiting > 0); |
645 | if (rc == H_SUCCESS) | |
91dc182c DB |
646 | goto out; |
647 | ||
706c8c93 | 648 | if (rc == H_CONTINUE) { |
91dc182c | 649 | data->waiting = 0; |
c4cb8ecc DB |
650 | data->args->args[data->args->nargs] = |
651 | rtas_call(ibm_suspend_me_token, 0, 1, NULL); | |
0e551954 | 652 | for_each_possible_cpu(i) |
82a4df74 | 653 | plpar_hcall_norets(H_PROD,i); |
91dc182c DB |
654 | } else { |
655 | data->waiting = -EBUSY; | |
706c8c93 | 656 | printk(KERN_ERR "Error on H_JOIN hypervisor call\n"); |
91dc182c DB |
657 | } |
658 | ||
659 | out: | |
91dc182c DB |
660 | local_irq_restore(flags); |
661 | return; | |
662 | } | |
663 | ||
664 | static int rtas_ibm_suspend_me(struct rtas_args *args) | |
665 | { | |
666 | int i; | |
368a6ba5 DB |
667 | long state; |
668 | long rc; | |
669 | unsigned long dummy; | |
91dc182c DB |
670 | |
671 | struct rtas_suspend_me_data data; | |
672 | ||
368a6ba5 DB |
673 | /* Make sure the state is valid */ |
674 | rc = plpar_hcall(H_VASI_STATE, | |
675 | ((u64)args->args[0] << 32) | args->args[1], | |
676 | 0, 0, 0, | |
677 | &state, &dummy, &dummy); | |
678 | ||
679 | if (rc) { | |
680 | printk(KERN_ERR "rtas_ibm_suspend_me: vasi_state returned %ld\n",rc); | |
681 | return rc; | |
682 | } else if (state == H_VASI_ENABLED) { | |
683 | args->args[args->nargs] = RTAS_NOT_SUSPENDABLE; | |
684 | return 0; | |
685 | } else if (state != H_VASI_SUSPENDING) { | |
686 | printk(KERN_ERR "rtas_ibm_suspend_me: vasi_state returned state %ld\n", | |
687 | state); | |
688 | args->args[args->nargs] = -1; | |
689 | return 0; | |
690 | } | |
691 | ||
91dc182c DB |
692 | data.waiting = 1; |
693 | data.args = args; | |
694 | ||
695 | /* Call function on all CPUs. One of us will make the | |
696 | * rtas call | |
697 | */ | |
698 | if (on_each_cpu(rtas_percpu_suspend_me, &data, 1, 0)) | |
699 | data.waiting = -EINVAL; | |
700 | ||
701 | if (data.waiting != 0) | |
702 | printk(KERN_ERR "Error doing global join\n"); | |
703 | ||
704 | /* Prod each CPU. This won't hurt, and will wake | |
706c8c93 | 705 | * anyone we successfully put to sleep with H_JOIN. |
91dc182c | 706 | */ |
0e551954 | 707 | for_each_possible_cpu(i) |
91dc182c DB |
708 | plpar_hcall_norets(H_PROD, i); |
709 | ||
710 | return data.waiting; | |
711 | } | |
712 | #else /* CONFIG_PPC_PSERIES */ | |
713 | static int rtas_ibm_suspend_me(struct rtas_args *args) | |
714 | { | |
715 | return -ENOSYS; | |
716 | } | |
717 | #endif | |
1da177e4 LT |
718 | |
719 | asmlinkage int ppc_rtas(struct rtas_args __user *uargs) | |
720 | { | |
721 | struct rtas_args args; | |
722 | unsigned long flags; | |
033ef338 | 723 | char *buff_copy, *errbuf = NULL; |
1da177e4 | 724 | int nargs; |
91dc182c | 725 | int rc; |
1da177e4 LT |
726 | |
727 | if (!capable(CAP_SYS_ADMIN)) | |
728 | return -EPERM; | |
729 | ||
730 | if (copy_from_user(&args, uargs, 3 * sizeof(u32)) != 0) | |
731 | return -EFAULT; | |
732 | ||
733 | nargs = args.nargs; | |
734 | if (nargs > ARRAY_SIZE(args.args) | |
735 | || args.nret > ARRAY_SIZE(args.args) | |
736 | || nargs + args.nret > ARRAY_SIZE(args.args)) | |
737 | return -EINVAL; | |
738 | ||
739 | /* Copy in args. */ | |
740 | if (copy_from_user(args.args, uargs->args, | |
741 | nargs * sizeof(rtas_arg_t)) != 0) | |
742 | return -EFAULT; | |
743 | ||
91dc182c DB |
744 | if (args.token == RTAS_UNKNOWN_SERVICE) |
745 | return -EINVAL; | |
746 | ||
747 | /* Need to handle ibm,suspend_me call specially */ | |
748 | if (args.token == ibm_suspend_me_token) { | |
749 | rc = rtas_ibm_suspend_me(&args); | |
750 | if (rc) | |
751 | return rc; | |
752 | goto copy_return; | |
753 | } | |
754 | ||
033ef338 | 755 | buff_copy = get_errorlog_buffer(); |
1da177e4 LT |
756 | |
757 | spin_lock_irqsave(&rtas.lock, flags); | |
758 | ||
759 | rtas.args = args; | |
760 | enter_rtas(__pa(&rtas.args)); | |
761 | args = rtas.args; | |
762 | ||
763 | args.rets = &args.args[nargs]; | |
764 | ||
765 | /* A -1 return code indicates that the last command couldn't | |
766 | be completed due to a hardware error. */ | |
033ef338 PM |
767 | if (args.rets[0] == -1) |
768 | errbuf = __fetch_rtas_last_error(buff_copy); | |
1da177e4 LT |
769 | |
770 | spin_unlock_irqrestore(&rtas.lock, flags); | |
771 | ||
772 | if (buff_copy) { | |
033ef338 PM |
773 | if (errbuf) |
774 | log_error(errbuf, ERR_TYPE_RTAS_LOG, 0); | |
1da177e4 LT |
775 | kfree(buff_copy); |
776 | } | |
777 | ||
91dc182c | 778 | copy_return: |
1da177e4 LT |
779 | /* Copy out args. */ |
780 | if (copy_to_user(uargs->args + nargs, | |
781 | args.args + nargs, | |
782 | args.nret * sizeof(rtas_arg_t)) != 0) | |
783 | return -EFAULT; | |
784 | ||
785 | return 0; | |
786 | } | |
787 | ||
788 | /* This version can't take the spinlock, because it never returns */ | |
789 | ||
790 | struct rtas_args rtas_stop_self_args = { | |
791 | /* The token is initialized for real in setup_system() */ | |
792 | .token = RTAS_UNKNOWN_SERVICE, | |
793 | .nargs = 0, | |
794 | .nret = 1, | |
795 | .rets = &rtas_stop_self_args.args[0], | |
796 | }; | |
797 | ||
798 | void rtas_stop_self(void) | |
799 | { | |
800 | struct rtas_args *rtas_args = &rtas_stop_self_args; | |
801 | ||
802 | local_irq_disable(); | |
803 | ||
804 | BUG_ON(rtas_args->token == RTAS_UNKNOWN_SERVICE); | |
805 | ||
806 | printk("cpu %u (hwid %u) Ready to die...\n", | |
807 | smp_processor_id(), hard_smp_processor_id()); | |
808 | enter_rtas(__pa(rtas_args)); | |
809 | ||
810 | panic("Alas, I survived.\n"); | |
811 | } | |
812 | ||
813 | /* | |
943ffb58 | 814 | * Call early during boot, before mem init or bootmem, to retrieve the RTAS |
1da177e4 LT |
815 | * informations from the device-tree and allocate the RMO buffer for userland |
816 | * accesses. | |
817 | */ | |
818 | void __init rtas_initialize(void) | |
819 | { | |
033ef338 PM |
820 | unsigned long rtas_region = RTAS_INSTANTIATE_MAX; |
821 | ||
1da177e4 LT |
822 | /* Get RTAS dev node and fill up our "rtas" structure with infos |
823 | * about it. | |
824 | */ | |
825 | rtas.dev = of_find_node_by_name(NULL, "rtas"); | |
826 | if (rtas.dev) { | |
827 | u32 *basep, *entryp; | |
828 | u32 *sizep; | |
829 | ||
830 | basep = (u32 *)get_property(rtas.dev, "linux,rtas-base", NULL); | |
831 | sizep = (u32 *)get_property(rtas.dev, "rtas-size", NULL); | |
832 | if (basep != NULL && sizep != NULL) { | |
833 | rtas.base = *basep; | |
834 | rtas.size = *sizep; | |
835 | entryp = (u32 *)get_property(rtas.dev, "linux,rtas-entry", NULL); | |
836 | if (entryp == NULL) /* Ugh */ | |
837 | rtas.entry = rtas.base; | |
838 | else | |
839 | rtas.entry = *entryp; | |
840 | } else | |
841 | rtas.dev = NULL; | |
842 | } | |
033ef338 PM |
843 | if (!rtas.dev) |
844 | return; | |
845 | ||
1da177e4 LT |
846 | /* If RTAS was found, allocate the RMO buffer for it and look for |
847 | * the stop-self token if any | |
848 | */ | |
033ef338 | 849 | #ifdef CONFIG_PPC64 |
e8222502 | 850 | if (machine_is(pseries) && firmware_has_feature(FW_FEATURE_LPAR)) { |
033ef338 | 851 | rtas_region = min(lmb.rmo_size, RTAS_INSTANTIATE_MAX); |
91dc182c DB |
852 | ibm_suspend_me_token = rtas_token("ibm,suspend-me"); |
853 | } | |
033ef338 PM |
854 | #endif |
855 | rtas_rmo_buf = lmb_alloc_base(RTAS_RMOBUF_MAX, PAGE_SIZE, rtas_region); | |
1da177e4 LT |
856 | |
857 | #ifdef CONFIG_HOTPLUG_CPU | |
033ef338 | 858 | rtas_stop_self_args.token = rtas_token("stop-self"); |
1da177e4 | 859 | #endif /* CONFIG_HOTPLUG_CPU */ |
033ef338 PM |
860 | #ifdef CONFIG_RTAS_ERROR_LOGGING |
861 | rtas_last_error_token = rtas_token("rtas-last-error"); | |
862 | #endif | |
1da177e4 | 863 | } |
458148c0 ME |
864 | |
865 | int __init early_init_dt_scan_rtas(unsigned long node, | |
866 | const char *uname, int depth, void *data) | |
867 | { | |
868 | u32 *basep, *entryp, *sizep; | |
869 | ||
870 | if (depth != 1 || strcmp(uname, "rtas") != 0) | |
871 | return 0; | |
872 | ||
873 | basep = of_get_flat_dt_prop(node, "linux,rtas-base", NULL); | |
874 | entryp = of_get_flat_dt_prop(node, "linux,rtas-entry", NULL); | |
875 | sizep = of_get_flat_dt_prop(node, "rtas-size", NULL); | |
876 | ||
877 | if (basep && entryp && sizep) { | |
878 | rtas.base = *basep; | |
879 | rtas.entry = *entryp; | |
880 | rtas.size = *sizep; | |
881 | } | |
882 | ||
cc46bb98 ME |
883 | #ifdef CONFIG_UDBG_RTAS_CONSOLE |
884 | basep = of_get_flat_dt_prop(node, "put-term-char", NULL); | |
885 | if (basep) | |
886 | rtas_putchar_token = *basep; | |
887 | ||
888 | basep = of_get_flat_dt_prop(node, "get-term-char", NULL); | |
889 | if (basep) | |
890 | rtas_getchar_token = *basep; | |
891 | #endif | |
892 | ||
458148c0 ME |
893 | /* break now */ |
894 | return 1; | |
895 | } |