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ASoC: imx: remove superfluous code in imx-ssi.c
[linux-2.6.git] / arch / powerpc / kernel / rtas.c
blob2097f2b3cba8df3e3ab6b582d19767b935da8157
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>
20 #include <linux/capability.h>
21 #include <linux/delay.h>
22 #include <linux/smp.h>
23 #include <linux/completion.h>
24 #include <linux/cpumask.h>
25 #include <linux/memblock.h>
26 #include <linux/slab.h>
27
28 #include <asm/prom.h>
29 #include <asm/rtas.h>
30 #include <asm/hvcall.h>
31 #include <asm/machdep.h>
32 #include <asm/firmware.h>
33 #include <asm/page.h>
34 #include <asm/param.h>
35 #include <asm/system.h>
36 #include <asm/delay.h>
37 #include <asm/uaccess.h>
38 #include <asm/udbg.h>
39 #include <asm/syscalls.h>
40 #include <asm/smp.h>
41 #include <asm/atomic.h>
42 #include <asm/time.h>
43 #include <asm/mmu.h>
44 #include <asm/topology.h>
45
46 struct rtas_t rtas = {
47 .lock = __ARCH_SPIN_LOCK_UNLOCKED
48 };
49 EXPORT_SYMBOL(rtas);
50
51 DEFINE_SPINLOCK(rtas_data_buf_lock);
52 EXPORT_SYMBOL(rtas_data_buf_lock);
53
54 char rtas_data_buf[RTAS_DATA_BUF_SIZE] __cacheline_aligned;
55 EXPORT_SYMBOL(rtas_data_buf);
56
57 unsigned long rtas_rmo_buf;
58
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
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();
77 arch_spin_lock_flags(&rtas.lock, flags);
78 return flags;
79 }
80
81 static void unlock_rtas(unsigned long flags)
82 {
83 arch_spin_unlock(&rtas.lock);
84 local_irq_restore(flags);
85 preempt_enable();
86 }
87
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 */
93 static void call_rtas_display_status(char c)
94 {
95 struct rtas_args *args = &rtas.args;
96 unsigned long s;
97
98 if (!rtas.base)
99 return;
100 s = lock_rtas();
101
102 args->token = 10;
103 args->nargs = 1;
104 args->nret = 1;
105 args->rets = (rtas_arg_t *)&(args->args[1]);
106 args->args[0] = (unsigned char)c;
107
108 enter_rtas(__pa(args));
109
110 unlock_rtas(s);
111 }
112
113 static void call_rtas_display_status_delay(char c)
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;
122 mdelay(500);
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
137 void __init udbg_init_rtas_panel(void)
138 {
139 udbg_putc = call_rtas_display_status_delay;
140 }
141
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
202 void rtas_progress(char *s, unsigned short hex)
203 {
204 struct device_node *root;
205 int width;
206 const int *p;
207 char *os;
208 static int display_character, set_indicator;
209 static int display_width, display_lines, form_feed;
210 static const int *row_width;
211 static DEFINE_SPINLOCK(progress_lock);
212 static int current_line;
213 static int pending_newline = 0; /* did last write end with unprinted newline? */
214
215 if (!rtas.base)
216 return;
217
218 if (display_width == 0) {
219 display_width = 0x10;
220 if ((root = of_find_node_by_path("/rtas"))) {
221 if ((p = of_get_property(root,
222 "ibm,display-line-length", NULL)))
223 display_width = *p;
224 if ((p = of_get_property(root,
225 "ibm,form-feed", NULL)))
226 form_feed = *p;
227 if ((p = of_get_property(root,
228 "ibm,display-number-of-lines", NULL)))
229 display_lines = *p;
230 row_width = of_get_property(root,
231 "ibm,display-truncation-length", NULL);
232 of_node_put(root);
233 }
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 *
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.
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 {
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');
267 }
268
269 if (row_width)
270 width = row_width[current_line];
271 else
272 width = display_width;
273 os = s;
274 while (*os) {
275 if (*os == '\n' || *os == '\r') {
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;
282 current_line++;
283 if (current_line > display_lines-1)
284 current_line = display_lines-1;
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
301 if (row_width)
302 width = row_width[current_line];
303 else
304 width = display_width;
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
318 spin_unlock(&progress_lock);
319 }
320 EXPORT_SYMBOL(rtas_progress); /* needed by rtas_flash module */
321
322 int rtas_token(const char *service)
323 {
324 const int *tokp;
325 if (rtas.dev == NULL)
326 return RTAS_UNKNOWN_SERVICE;
327 tokp = of_get_property(rtas.dev, service, NULL);
328 return tokp ? *tokp : RTAS_UNKNOWN_SERVICE;
329 }
330 EXPORT_SYMBOL(rtas_token);
331
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
338 #ifdef CONFIG_RTAS_ERROR_LOGGING
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)) {
353 printk (KERN_WARNING "RTAS: bad log buffer size %d\n",
354 rtas_error_log_max);
355 rtas_error_log_max = RTAS_ERROR_LOG_MAX;
356 }
357 return rtas_error_log_max;
358 }
359 EXPORT_SYMBOL(rtas_get_error_log_max);
360
361
362 static char rtas_err_buf[RTAS_ERROR_LOG_MAX];
363 static int rtas_last_error_token;
364
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 */
371 static char *__fetch_rtas_last_error(char *altbuf)
372 {
373 struct rtas_args err_args, save_args;
374 u32 bufsz;
375 char *buf = NULL;
376
377 if (rtas_last_error_token == -1)
378 return NULL;
379
380 bufsz = rtas_get_error_log_max();
381
382 err_args.token = rtas_last_error_token;
383 err_args.nargs = 2;
384 err_args.nret = 1;
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
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;
411 }
412
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
420 int rtas_call(int token, int nargs, int nret, int *outputs, ...)
421 {
422 va_list list;
423 int i;
424 unsigned long s;
425 struct rtas_args *rtas_args;
426 char *buff_copy = NULL;
427 int ret;
428
429 if (!rtas.entry || token == RTAS_UNKNOWN_SERVICE)
430 return -1;
431
432 s = lock_rtas();
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);
440 for (i = 0; i < nargs; ++i)
441 rtas_args->args[i] = va_arg(list, rtas_arg_t);
442 va_end(list);
443
444 for (i = 0; i < nret; ++i)
445 rtas_args->rets[i] = 0;
446
447 enter_rtas(__pa(rtas_args));
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)
452 buff_copy = __fetch_rtas_last_error(NULL);
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
459 unlock_rtas(s);
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 }
468 EXPORT_SYMBOL(rtas_call);
469
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.
472 */
473 unsigned int rtas_busy_delay_time(int status)
474 {
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 }
485
486 return ms;
487 }
488 EXPORT_SYMBOL(rtas_busy_delay_time);
489
490 /* For an RTAS busy status code, perform the hinted delay. */
491 unsigned int rtas_busy_delay(int status)
492 {
493 unsigned int ms;
494
495 might_sleep();
496 ms = rtas_busy_delay_time(status);
497 if (ms)
498 msleep(ms);
499
500 return ms;
501 }
502 EXPORT_SYMBOL(rtas_busy_delay);
503
504 static int rtas_error_rc(int rtas_rc)
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",
526 __func__, rtas_rc);
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 }
548 EXPORT_SYMBOL(rtas_get_power_level);
549
550 int rtas_set_power_level(int powerdomain, int level, int *setlevel)
551 {
552 int token = rtas_token("set-power-level");
553 int rc;
554
555 if (token == RTAS_UNKNOWN_SERVICE)
556 return -ENOENT;
557
558 do {
559 rc = rtas_call(token, 2, 2, setlevel, powerdomain, level);
560 } while (rtas_busy_delay(rc));
561
562 if (rc < 0)
563 return rtas_error_rc(rc);
564 return rc;
565 }
566 EXPORT_SYMBOL(rtas_set_power_level);
567
568 int rtas_get_sensor(int sensor, int index, int *state)
569 {
570 int token = rtas_token("get-sensor-state");
571 int rc;
572
573 if (token == RTAS_UNKNOWN_SERVICE)
574 return -ENOENT;
575
576 do {
577 rc = rtas_call(token, 2, 2, state, sensor, index);
578 } while (rtas_busy_delay(rc));
579
580 if (rc < 0)
581 return rtas_error_rc(rc);
582 return rc;
583 }
584 EXPORT_SYMBOL(rtas_get_sensor);
585
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
612 int rtas_set_indicator(int indicator, int index, int new_value)
613 {
614 int token = rtas_token("set-indicator");
615 int rc;
616
617 if (token == RTAS_UNKNOWN_SERVICE)
618 return -ENOENT;
619
620 do {
621 rc = rtas_call(token, 3, 1, NULL, indicator, index, new_value);
622 } while (rtas_busy_delay(rc));
623
624 if (rc < 0)
625 return rtas_error_rc(rc);
626 return rc;
627 }
628 EXPORT_SYMBOL(rtas_set_indicator);
629
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
651 void rtas_restart(char *cmd)
652 {
653 if (rtas_flash_term_hook)
654 rtas_flash_term_hook(SYS_RESTART);
655 printk("RTAS system-reboot returned %d\n",
656 rtas_call(rtas_token("system-reboot"), 0, 1, NULL));
657 for (;;);
658 }
659
660 void rtas_power_off(void)
661 {
662 if (rtas_flash_term_hook)
663 rtas_flash_term_hook(SYS_POWER_OFF);
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
670 void rtas_halt(void)
671 {
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 (;;);
678 }
679
680 /* Must be in the RMO region, so we place it here */
681 static char rtas_os_term_buf[2048];
682
683 void rtas_os_term(char *str)
684 {
685 int status;
686
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"))
695 return;
696
697 snprintf(rtas_os_term_buf, 2048, "OS panic: %s", str);
698
699 do {
700 status = rtas_call(rtas_token("ibm,os-term"), 1, 1, NULL,
701 __pa(rtas_os_term_buf));
702 } while (rtas_busy_delay(status));
703
704 if (status != 0)
705 printk(KERN_EMERG "ibm,os-term call failed %d\n", status);
706 }
707
708 static int ibm_suspend_me_token = RTAS_UNKNOWN_SERVICE;
709 #ifdef CONFIG_PPC_PSERIES
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 stop_topology_update();
718 printk(KERN_DEBUG "calling ibm,suspend-me on cpu %i\n", smp_processor_id());
719
720 while (rc == H_MULTI_THREADS_ACTIVE && !atomic_read(&data->done) &&
721 !atomic_read(&data->error))
722 rc = rtas_call(data->token, 0, 1, NULL);
723
724 if (rc || atomic_read(&data->error)) {
725 printk(KERN_DEBUG "ibm,suspend-me returned %d\n", rc);
726 slb_set_size(slb_size);
727 }
728
729 if (atomic_read(&data->error))
730 rc = atomic_read(&data->error);
731
732 atomic_set(&data->error, rc);
733 start_topology_update();
734
735 if (wake_when_done) {
736 atomic_set(&data->done, 1);
737
738 for_each_online_cpu(cpu)
739 plpar_hcall_norets(H_PROD, get_hard_smp_processor_id(cpu));
740 }
741
742 if (atomic_dec_return(&data->working) == 0)
743 complete(data->complete);
744
745 return rc;
746 }
747
748 int rtas_suspend_last_cpu(struct rtas_suspend_me_data *data)
749 {
750 atomic_inc(&data->working);
751 return __rtas_suspend_last_cpu(data, 0);
752 }
753
754 static int __rtas_suspend_cpu(struct rtas_suspend_me_data *data, int wake_when_done)
755 {
756 long rc = H_SUCCESS;
757 unsigned long msr_save;
758 int cpu;
759
760 atomic_inc(&data->working);
761
762 /* really need to ensure MSR.EE is off for H_JOIN */
763 msr_save = mfmsr();
764 mtmsr(msr_save & ~(MSR_EE));
765
766 while (rc == H_SUCCESS && !atomic_read(&data->done) && !atomic_read(&data->error))
767 rc = plpar_hcall_norets(H_JOIN);
768
769 mtmsr(msr_save);
770
771 if (rc == H_SUCCESS) {
772 /* This cpu was prodded and the suspend is complete. */
773 goto out;
774 } else if (rc == H_CONTINUE) {
775 /* All other cpus are in H_JOIN, this cpu does
776 * the suspend.
777 */
778 return __rtas_suspend_last_cpu(data, wake_when_done);
779 } else {
780 printk(KERN_ERR "H_JOIN on cpu %i failed with rc = %ld\n",
781 smp_processor_id(), rc);
782 atomic_set(&data->error, rc);
783 }
784
785 if (wake_when_done) {
786 atomic_set(&data->done, 1);
787
788 /* This cpu did the suspend or got an error; in either case,
789 * we need to prod all other other cpus out of join state.
790 * Extra prods are harmless.
791 */
792 for_each_online_cpu(cpu)
793 plpar_hcall_norets(H_PROD, get_hard_smp_processor_id(cpu));
794 }
795 out:
796 if (atomic_dec_return(&data->working) == 0)
797 complete(data->complete);
798 return rc;
799 }
800
801 int rtas_suspend_cpu(struct rtas_suspend_me_data *data)
802 {
803 return __rtas_suspend_cpu(data, 0);
804 }
805
806 static void rtas_percpu_suspend_me(void *info)
807 {
808 __rtas_suspend_cpu((struct rtas_suspend_me_data *)info, 1);
809 }
810
811 int rtas_ibm_suspend_me(struct rtas_args *args)
812 {
813 long state;
814 long rc;
815 unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
816 struct rtas_suspend_me_data data;
817 DECLARE_COMPLETION_ONSTACK(done);
818
819 if (!rtas_service_present("ibm,suspend-me"))
820 return -ENOSYS;
821
822 /* Make sure the state is valid */
823 rc = plpar_hcall(H_VASI_STATE, retbuf,
824 ((u64)args->args[0] << 32) | args->args[1]);
825
826 state = retbuf[0];
827
828 if (rc) {
829 printk(KERN_ERR "rtas_ibm_suspend_me: vasi_state returned %ld\n",rc);
830 return rc;
831 } else if (state == H_VASI_ENABLED) {
832 args->args[args->nargs] = RTAS_NOT_SUSPENDABLE;
833 return 0;
834 } else if (state != H_VASI_SUSPENDING) {
835 printk(KERN_ERR "rtas_ibm_suspend_me: vasi_state returned state %ld\n",
836 state);
837 args->args[args->nargs] = -1;
838 return 0;
839 }
840
841 atomic_set(&data.working, 0);
842 atomic_set(&data.done, 0);
843 atomic_set(&data.error, 0);
844 data.token = rtas_token("ibm,suspend-me");
845 data.complete = &done;
846
847 /* Call function on all CPUs. One of us will make the
848 * rtas call
849 */
850 if (on_each_cpu(rtas_percpu_suspend_me, &data, 0))
851 atomic_set(&data.error, -EINVAL);
852
853 wait_for_completion(&done);
854
855 if (atomic_read(&data.error) != 0)
856 printk(KERN_ERR "Error doing global join\n");
857
858 return atomic_read(&data.error);
859 }
860 #else /* CONFIG_PPC_PSERIES */
861 int rtas_ibm_suspend_me(struct rtas_args *args)
862 {
863 return -ENOSYS;
864 }
865 #endif
866
867 asmlinkage int ppc_rtas(struct rtas_args __user *uargs)
868 {
869 struct rtas_args args;
870 unsigned long flags;
871 char *buff_copy, *errbuf = NULL;
872 int nargs;
873 int rc;
874
875 if (!capable(CAP_SYS_ADMIN))
876 return -EPERM;
877
878 if (copy_from_user(&args, uargs, 3 * sizeof(u32)) != 0)
879 return -EFAULT;
880
881 nargs = args.nargs;
882 if (nargs > ARRAY_SIZE(args.args)
883 || args.nret > ARRAY_SIZE(args.args)
884 || nargs + args.nret > ARRAY_SIZE(args.args))
885 return -EINVAL;
886
887 /* Copy in args. */
888 if (copy_from_user(args.args, uargs->args,
889 nargs * sizeof(rtas_arg_t)) != 0)
890 return -EFAULT;
891
892 if (args.token == RTAS_UNKNOWN_SERVICE)
893 return -EINVAL;
894
895 args.rets = &args.args[nargs];
896 memset(args.rets, 0, args.nret * sizeof(rtas_arg_t));
897
898 /* Need to handle ibm,suspend_me call specially */
899 if (args.token == ibm_suspend_me_token) {
900 rc = rtas_ibm_suspend_me(&args);
901 if (rc)
902 return rc;
903 goto copy_return;
904 }
905
906 buff_copy = get_errorlog_buffer();
907
908 flags = lock_rtas();
909
910 rtas.args = args;
911 enter_rtas(__pa(&rtas.args));
912 args = rtas.args;
913
914 /* A -1 return code indicates that the last command couldn't
915 be completed due to a hardware error. */
916 if (args.rets[0] == -1)
917 errbuf = __fetch_rtas_last_error(buff_copy);
918
919 unlock_rtas(flags);
920
921 if (buff_copy) {
922 if (errbuf)
923 log_error(errbuf, ERR_TYPE_RTAS_LOG, 0);
924 kfree(buff_copy);
925 }
926
927 copy_return:
928 /* Copy out args. */
929 if (copy_to_user(uargs->args + nargs,
930 args.args + nargs,
931 args.nret * sizeof(rtas_arg_t)) != 0)
932 return -EFAULT;
933
934 return 0;
935 }
936
937 /*
938 * Call early during boot, before mem init or bootmem, to retrieve the RTAS
939 * informations from the device-tree and allocate the RMO buffer for userland
940 * accesses.
941 */
942 void __init rtas_initialize(void)
943 {
944 unsigned long rtas_region = RTAS_INSTANTIATE_MAX;
945
946 /* Get RTAS dev node and fill up our "rtas" structure with infos
947 * about it.
948 */
949 rtas.dev = of_find_node_by_name(NULL, "rtas");
950 if (rtas.dev) {
951 const u32 *basep, *entryp, *sizep;
952
953 basep = of_get_property(rtas.dev, "linux,rtas-base", NULL);
954 sizep = of_get_property(rtas.dev, "rtas-size", NULL);
955 if (basep != NULL && sizep != NULL) {
956 rtas.base = *basep;
957 rtas.size = *sizep;
958 entryp = of_get_property(rtas.dev,
959 "linux,rtas-entry", NULL);
960 if (entryp == NULL) /* Ugh */
961 rtas.entry = rtas.base;
962 else
963 rtas.entry = *entryp;
964 } else
965 rtas.dev = NULL;
966 }
967 if (!rtas.dev)
968 return;
969
970 /* If RTAS was found, allocate the RMO buffer for it and look for
971 * the stop-self token if any
972 */
973 #ifdef CONFIG_PPC64
974 if (machine_is(pseries) && firmware_has_feature(FW_FEATURE_LPAR)) {
975 rtas_region = min(ppc64_rma_size, RTAS_INSTANTIATE_MAX);
976 ibm_suspend_me_token = rtas_token("ibm,suspend-me");
977 }
978 #endif
979 rtas_rmo_buf = memblock_alloc_base(RTAS_RMOBUF_MAX, PAGE_SIZE, rtas_region);
980
981 #ifdef CONFIG_RTAS_ERROR_LOGGING
982 rtas_last_error_token = rtas_token("rtas-last-error");
983 #endif
984 }
985
986 int __init early_init_dt_scan_rtas(unsigned long node,
987 const char *uname, int depth, void *data)
988 {
989 u32 *basep, *entryp, *sizep;
990
991 if (depth != 1 || strcmp(uname, "rtas") != 0)
992 return 0;
993
994 basep = of_get_flat_dt_prop(node, "linux,rtas-base", NULL);
995 entryp = of_get_flat_dt_prop(node, "linux,rtas-entry", NULL);
996 sizep = of_get_flat_dt_prop(node, "rtas-size", NULL);
997
998 if (basep && entryp && sizep) {
999 rtas.base = *basep;
1000 rtas.entry = *entryp;
1001 rtas.size = *sizep;
1002 }
1003
1004 #ifdef CONFIG_UDBG_RTAS_CONSOLE
1005 basep = of_get_flat_dt_prop(node, "put-term-char", NULL);
1006 if (basep)
1007 rtas_putchar_token = *basep;
1008
1009 basep = of_get_flat_dt_prop(node, "get-term-char", NULL);
1010 if (basep)
1011 rtas_getchar_token = *basep;
1012
1013 if (rtas_putchar_token != RTAS_UNKNOWN_SERVICE &&
1014 rtas_getchar_token != RTAS_UNKNOWN_SERVICE)
1015 udbg_init_rtas_console();
1016
1017 #endif
1018
1019 /* break now */
1020 return 1;
1021 }
1022
1023 static arch_spinlock_t timebase_lock;
1024 static u64 timebase = 0;
1025
1026 void __cpuinit rtas_give_timebase(void)
1027 {
1028 unsigned long flags;
1029
1030 local_irq_save(flags);
1031 hard_irq_disable();
1032 arch_spin_lock(&timebase_lock);
1033 rtas_call(rtas_token("freeze-time-base"), 0, 1, NULL);
1034 timebase = get_tb();
1035 arch_spin_unlock(&timebase_lock);
1036
1037 while (timebase)
1038 barrier();
1039 rtas_call(rtas_token("thaw-time-base"), 0, 1, NULL);
1040 local_irq_restore(flags);
1041 }
1042
1043 void __cpuinit rtas_take_timebase(void)
1044 {
1045 while (!timebase)
1046 barrier();
1047 arch_spin_lock(&timebase_lock);
1048 set_tb(timebase >> 32, timebase & 0xffffffff);
1049 timebase = 0;
1050 arch_spin_unlock(&timebase_lock);
1051 }
Linus' kernel tree