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