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Staging: comedi: hwdrv_apci2032.c: static sparse fix
[linux/fpc-iii.git] / arch / powerpc / kernel / rtas.c
blob74367841615a5ae3a31a2c2c9091916d79a0534c
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/lmb.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
45 struct rtas_t rtas = {
46 .lock = __ARCH_SPIN_LOCK_UNLOCKED
47 };
48 EXPORT_SYMBOL(rtas);
49
50 struct rtas_suspend_me_data {
51 atomic_t working; /* number of cpus accessing this struct */
52 atomic_t done;
53 int token; /* ibm,suspend-me */
54 int error;
55 struct completion *complete; /* wait on this until working == 0 */
56 };
57
58 DEFINE_SPINLOCK(rtas_data_buf_lock);
59 EXPORT_SYMBOL(rtas_data_buf_lock);
60
61 char rtas_data_buf[RTAS_DATA_BUF_SIZE] __cacheline_aligned;
62 EXPORT_SYMBOL(rtas_data_buf);
63
64 unsigned long rtas_rmo_buf;
65
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
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();
84 arch_spin_lock_flags(&rtas.lock, flags);
85 return flags;
86 }
87
88 static void unlock_rtas(unsigned long flags)
89 {
90 arch_spin_unlock(&rtas.lock);
91 local_irq_restore(flags);
92 preempt_enable();
93 }
94
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 */
100 static void call_rtas_display_status(char c)
101 {
102 struct rtas_args *args = &rtas.args;
103 unsigned long s;
104
105 if (!rtas.base)
106 return;
107 s = lock_rtas();
108
109 args->token = 10;
110 args->nargs = 1;
111 args->nret = 1;
112 args->rets = (rtas_arg_t *)&(args->args[1]);
113 args->args[0] = (unsigned char)c;
114
115 enter_rtas(__pa(args));
116
117 unlock_rtas(s);
118 }
119
120 static void call_rtas_display_status_delay(char c)
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;
129 mdelay(500);
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
144 void __init udbg_init_rtas_panel(void)
145 {
146 udbg_putc = call_rtas_display_status_delay;
147 }
148
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
209 void rtas_progress(char *s, unsigned short hex)
210 {
211 struct device_node *root;
212 int width;
213 const int *p;
214 char *os;
215 static int display_character, set_indicator;
216 static int display_width, display_lines, form_feed;
217 static const int *row_width;
218 static DEFINE_SPINLOCK(progress_lock);
219 static int current_line;
220 static int pending_newline = 0; /* did last write end with unprinted newline? */
221
222 if (!rtas.base)
223 return;
224
225 if (display_width == 0) {
226 display_width = 0x10;
227 if ((root = of_find_node_by_path("/rtas"))) {
228 if ((p = of_get_property(root,
229 "ibm,display-line-length", NULL)))
230 display_width = *p;
231 if ((p = of_get_property(root,
232 "ibm,form-feed", NULL)))
233 form_feed = *p;
234 if ((p = of_get_property(root,
235 "ibm,display-number-of-lines", NULL)))
236 display_lines = *p;
237 row_width = of_get_property(root,
238 "ibm,display-truncation-length", NULL);
239 of_node_put(root);
240 }
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 *
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.
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 {
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');
274 }
275
276 if (row_width)
277 width = row_width[current_line];
278 else
279 width = display_width;
280 os = s;
281 while (*os) {
282 if (*os == '\n' || *os == '\r') {
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;
289 current_line++;
290 if (current_line > display_lines-1)
291 current_line = display_lines-1;
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
308 if (row_width)
309 width = row_width[current_line];
310 else
311 width = display_width;
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
325 spin_unlock(&progress_lock);
326 }
327 EXPORT_SYMBOL(rtas_progress); /* needed by rtas_flash module */
328
329 int rtas_token(const char *service)
330 {
331 const int *tokp;
332 if (rtas.dev == NULL)
333 return RTAS_UNKNOWN_SERVICE;
334 tokp = of_get_property(rtas.dev, service, NULL);
335 return tokp ? *tokp : RTAS_UNKNOWN_SERVICE;
336 }
337 EXPORT_SYMBOL(rtas_token);
338
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
345 #ifdef CONFIG_RTAS_ERROR_LOGGING
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)) {
360 printk (KERN_WARNING "RTAS: bad log buffer size %d\n",
361 rtas_error_log_max);
362 rtas_error_log_max = RTAS_ERROR_LOG_MAX;
363 }
364 return rtas_error_log_max;
365 }
366 EXPORT_SYMBOL(rtas_get_error_log_max);
367
368
369 static char rtas_err_buf[RTAS_ERROR_LOG_MAX];
370 static int rtas_last_error_token;
371
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 */
378 static char *__fetch_rtas_last_error(char *altbuf)
379 {
380 struct rtas_args err_args, save_args;
381 u32 bufsz;
382 char *buf = NULL;
383
384 if (rtas_last_error_token == -1)
385 return NULL;
386
387 bufsz = rtas_get_error_log_max();
388
389 err_args.token = rtas_last_error_token;
390 err_args.nargs = 2;
391 err_args.nret = 1;
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
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;
418 }
419
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
427 int rtas_call(int token, int nargs, int nret, int *outputs, ...)
428 {
429 va_list list;
430 int i;
431 unsigned long s;
432 struct rtas_args *rtas_args;
433 char *buff_copy = NULL;
434 int ret;
435
436 if (!rtas.entry || token == RTAS_UNKNOWN_SERVICE)
437 return -1;
438
439 s = lock_rtas();
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);
447 for (i = 0; i < nargs; ++i)
448 rtas_args->args[i] = va_arg(list, rtas_arg_t);
449 va_end(list);
450
451 for (i = 0; i < nret; ++i)
452 rtas_args->rets[i] = 0;
453
454 enter_rtas(__pa(rtas_args));
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)
459 buff_copy = __fetch_rtas_last_error(NULL);
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
466 unlock_rtas(s);
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 }
475 EXPORT_SYMBOL(rtas_call);
476
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.
479 */
480 unsigned int rtas_busy_delay_time(int status)
481 {
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 }
492
493 return ms;
494 }
495 EXPORT_SYMBOL(rtas_busy_delay_time);
496
497 /* For an RTAS busy status code, perform the hinted delay. */
498 unsigned int rtas_busy_delay(int status)
499 {
500 unsigned int ms;
501
502 might_sleep();
503 ms = rtas_busy_delay_time(status);
504 if (ms)
505 msleep(ms);
506
507 return ms;
508 }
509 EXPORT_SYMBOL(rtas_busy_delay);
510
511 static int rtas_error_rc(int rtas_rc)
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",
533 __func__, rtas_rc);
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 }
555 EXPORT_SYMBOL(rtas_get_power_level);
556
557 int rtas_set_power_level(int powerdomain, int level, int *setlevel)
558 {
559 int token = rtas_token("set-power-level");
560 int rc;
561
562 if (token == RTAS_UNKNOWN_SERVICE)
563 return -ENOENT;
564
565 do {
566 rc = rtas_call(token, 2, 2, setlevel, powerdomain, level);
567 } while (rtas_busy_delay(rc));
568
569 if (rc < 0)
570 return rtas_error_rc(rc);
571 return rc;
572 }
573 EXPORT_SYMBOL(rtas_set_power_level);
574
575 int rtas_get_sensor(int sensor, int index, int *state)
576 {
577 int token = rtas_token("get-sensor-state");
578 int rc;
579
580 if (token == RTAS_UNKNOWN_SERVICE)
581 return -ENOENT;
582
583 do {
584 rc = rtas_call(token, 2, 2, state, sensor, index);
585 } while (rtas_busy_delay(rc));
586
587 if (rc < 0)
588 return rtas_error_rc(rc);
589 return rc;
590 }
591 EXPORT_SYMBOL(rtas_get_sensor);
592
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
619 int rtas_set_indicator(int indicator, int index, int new_value)
620 {
621 int token = rtas_token("set-indicator");
622 int rc;
623
624 if (token == RTAS_UNKNOWN_SERVICE)
625 return -ENOENT;
626
627 do {
628 rc = rtas_call(token, 3, 1, NULL, indicator, index, new_value);
629 } while (rtas_busy_delay(rc));
630
631 if (rc < 0)
632 return rtas_error_rc(rc);
633 return rc;
634 }
635 EXPORT_SYMBOL(rtas_set_indicator);
636
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
658 void rtas_restart(char *cmd)
659 {
660 if (rtas_flash_term_hook)
661 rtas_flash_term_hook(SYS_RESTART);
662 printk("RTAS system-reboot returned %d\n",
663 rtas_call(rtas_token("system-reboot"), 0, 1, NULL));
664 for (;;);
665 }
666
667 void rtas_power_off(void)
668 {
669 if (rtas_flash_term_hook)
670 rtas_flash_term_hook(SYS_POWER_OFF);
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
677 void rtas_halt(void)
678 {
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 (;;);
685 }
686
687 /* Must be in the RMO region, so we place it here */
688 static char rtas_os_term_buf[2048];
689
690 void rtas_os_term(char *str)
691 {
692 int status;
693
694 if (panic_timeout)
695 return;
696
697 if (RTAS_UNKNOWN_SERVICE == rtas_token("ibm,os-term"))
698 return;
699
700 snprintf(rtas_os_term_buf, 2048, "OS panic: %s", str);
701
702 do {
703 status = rtas_call(rtas_token("ibm,os-term"), 1, 1, NULL,
704 __pa(rtas_os_term_buf));
705 } while (rtas_busy_delay(status));
706
707 if (status != 0)
708 printk(KERN_EMERG "ibm,os-term call failed %d\n",
709 status);
710 }
711
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 {
716 long rc = H_SUCCESS;
717 unsigned long msr_save;
718 u16 slb_size = mmu_slb_size;
719 int cpu;
720 struct rtas_suspend_me_data *data =
721 (struct rtas_suspend_me_data *)info;
722
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
729 while (rc == H_SUCCESS && !atomic_read(&data->done))
730 rc = plpar_hcall_norets(H_JOIN);
731
732 mtmsr(msr_save);
733
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 */
741 slb_set_size(SLB_MIN_SIZE);
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
746 if (data->error) {
747 printk(KERN_DEBUG "ibm,suspend-me returned %d\n",
748 data->error);
749 slb_set_size(slb_size);
750 }
751 } else {
752 printk(KERN_ERR "H_JOIN on cpu %i failed with rc = %ld\n",
753 smp_processor_id(), rc);
754 data->error = rc;
755 }
756
757 atomic_set(&data->done, 1);
758
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));
765 out:
766 if (atomic_dec_return(&data->working) == 0)
767 complete(data->complete);
768 }
769
770 static int rtas_ibm_suspend_me(struct rtas_args *args)
771 {
772 long state;
773 long rc;
774 unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
775 struct rtas_suspend_me_data data;
776 DECLARE_COMPLETION_ONSTACK(done);
777
778 if (!rtas_service_present("ibm,suspend-me"))
779 return -ENOSYS;
780
781 /* Make sure the state is valid */
782 rc = plpar_hcall(H_VASI_STATE, retbuf,
783 ((u64)args->args[0] << 32) | args->args[1]);
784
785 state = retbuf[0];
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
800 atomic_set(&data.working, 0);
801 atomic_set(&data.done, 0);
802 data.token = rtas_token("ibm,suspend-me");
803 data.error = 0;
804 data.complete = &done;
805
806 /* Call function on all CPUs. One of us will make the
807 * rtas call
808 */
809 if (on_each_cpu(rtas_percpu_suspend_me, &data, 0))
810 data.error = -EINVAL;
811
812 wait_for_completion(&done);
813
814 if (data.error != 0)
815 printk(KERN_ERR "Error doing global join\n");
816
817 return data.error;
818 }
819 #else /* CONFIG_PPC_PSERIES */
820 static int rtas_ibm_suspend_me(struct rtas_args *args)
821 {
822 return -ENOSYS;
823 }
824 #endif
825
826 asmlinkage int ppc_rtas(struct rtas_args __user *uargs)
827 {
828 struct rtas_args args;
829 unsigned long flags;
830 char *buff_copy, *errbuf = NULL;
831 int nargs;
832 int rc;
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
851 if (args.token == RTAS_UNKNOWN_SERVICE)
852 return -EINVAL;
853
854 args.rets = &args.args[nargs];
855 memset(args.rets, 0, args.nret * sizeof(rtas_arg_t));
856
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
865 buff_copy = get_errorlog_buffer();
866
867 flags = lock_rtas();
868
869 rtas.args = args;
870 enter_rtas(__pa(&rtas.args));
871 args = rtas.args;
872
873 /* A -1 return code indicates that the last command couldn't
874 be completed due to a hardware error. */
875 if (args.rets[0] == -1)
876 errbuf = __fetch_rtas_last_error(buff_copy);
877
878 unlock_rtas(flags);
879
880 if (buff_copy) {
881 if (errbuf)
882 log_error(errbuf, ERR_TYPE_RTAS_LOG, 0);
883 kfree(buff_copy);
884 }
885
886 copy_return:
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
896 /*
897 * Call early during boot, before mem init or bootmem, to retrieve the RTAS
898 * informations from the device-tree and allocate the RMO buffer for userland
899 * accesses.
900 */
901 void __init rtas_initialize(void)
902 {
903 unsigned long rtas_region = RTAS_INSTANTIATE_MAX;
904
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) {
910 const u32 *basep, *entryp, *sizep;
911
912 basep = of_get_property(rtas.dev, "linux,rtas-base", NULL);
913 sizep = of_get_property(rtas.dev, "rtas-size", NULL);
914 if (basep != NULL && sizep != NULL) {
915 rtas.base = *basep;
916 rtas.size = *sizep;
917 entryp = of_get_property(rtas.dev,
918 "linux,rtas-entry", NULL);
919 if (entryp == NULL) /* Ugh */
920 rtas.entry = rtas.base;
921 else
922 rtas.entry = *entryp;
923 } else
924 rtas.dev = NULL;
925 }
926 if (!rtas.dev)
927 return;
928
929 /* If RTAS was found, allocate the RMO buffer for it and look for
930 * the stop-self token if any
931 */
932 #ifdef CONFIG_PPC64
933 if (machine_is(pseries) && firmware_has_feature(FW_FEATURE_LPAR)) {
934 rtas_region = min(lmb.rmo_size, RTAS_INSTANTIATE_MAX);
935 ibm_suspend_me_token = rtas_token("ibm,suspend-me");
936 }
937 #endif
938 rtas_rmo_buf = lmb_alloc_base(RTAS_RMOBUF_MAX, PAGE_SIZE, rtas_region);
939
940 #ifdef CONFIG_RTAS_ERROR_LOGGING
941 rtas_last_error_token = rtas_token("rtas-last-error");
942 #endif
943 }
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
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;
971
972 if (rtas_putchar_token != RTAS_UNKNOWN_SERVICE &&
973 rtas_getchar_token != RTAS_UNKNOWN_SERVICE)
974 udbg_init_rtas_console();
975
976 #endif
977
978 /* break now */
979 return 1;
980 }
981
982 static arch_spinlock_t timebase_lock;
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();
991 arch_spin_lock(&timebase_lock);
992 rtas_call(rtas_token("freeze-time-base"), 0, 1, NULL);
993 timebase = get_tb();
994 arch_spin_unlock(&timebase_lock);
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();
1006 arch_spin_lock(&timebase_lock);
1007 set_tb(timebase >> 32, timebase & 0xffffffff);
1008 timebase = 0;
1009 arch_spin_unlock(&timebase_lock);
1010 }
Linux with added FPC-III support