3 * Procedures for interfacing to the RTAS on CHRP machines.
5 * Peter Bergner, IBM March 2001.
6 * Copyright (C) 2001 IBM.
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.
15 #include <linux/kernel.h>
16 #include <linux/types.h>
17 #include <linux/spinlock.h>
18 #include <linux/export.h>
19 #include <linux/init.h>
20 #include <linux/capability.h>
21 #include <linux/delay.h>
22 #include <linux/cpu.h>
23 #include <linux/smp.h>
24 #include <linux/completion.h>
25 #include <linux/cpumask.h>
26 #include <linux/memblock.h>
27 #include <linux/slab.h>
28 #include <linux/reboot.h>
32 #include <asm/hvcall.h>
33 #include <asm/machdep.h>
34 #include <asm/firmware.h>
36 #include <asm/param.h>
37 #include <asm/system.h>
38 #include <asm/delay.h>
39 #include <asm/uaccess.h>
41 #include <asm/syscalls.h>
43 #include <linux/atomic.h>
46 #include <asm/topology.h>
47 #include <asm/pSeries_reconfig.h>
49 struct rtas_t rtas = {
50 .lock = __ARCH_SPIN_LOCK_UNLOCKED
54 DEFINE_SPINLOCK(rtas_data_buf_lock);
55 EXPORT_SYMBOL(rtas_data_buf_lock);
57 char rtas_data_buf[RTAS_DATA_BUF_SIZE] __cacheline_aligned;
58 EXPORT_SYMBOL(rtas_data_buf);
60 unsigned long rtas_rmo_buf;
63 * If non-NULL, this gets called when the kernel terminates.
64 * This is done like this so rtas_flash can be a module.
66 void (*rtas_flash_term_hook)(int);
67 EXPORT_SYMBOL(rtas_flash_term_hook);
69 /* RTAS use home made raw locking instead of spin_lock_irqsave
70 * because those can be called from within really nasty contexts
71 * such as having the timebase stopped which would lockup with
72 * normal locks and spinlock debugging enabled
74 static unsigned long lock_rtas(void)
78 local_irq_save(flags);
80 arch_spin_lock_flags(&rtas.lock, flags);
84 static void unlock_rtas(unsigned long flags)
86 arch_spin_unlock(&rtas.lock);
87 local_irq_restore(flags);
92 * call_rtas_display_status and call_rtas_display_status_delay
93 * are designed only for very early low-level debugging, which
94 * is why the token is hard-coded to 10.
96 static void call_rtas_display_status(char c)
98 struct rtas_args *args = &rtas.args;
108 args->rets = (rtas_arg_t *)&(args->args[1]);
109 args->args[0] = (unsigned char)c;
111 enter_rtas(__pa(args));
116 static void call_rtas_display_status_delay(char c)
118 static int pending_newline = 0; /* did last write end with unprinted newline? */
119 static int width = 16;
123 call_rtas_display_status(' ');
128 if (pending_newline) {
129 call_rtas_display_status('\r');
130 call_rtas_display_status('\n');
134 call_rtas_display_status(c);
140 void __init udbg_init_rtas_panel(void)
142 udbg_putc = call_rtas_display_status_delay;
145 #ifdef CONFIG_UDBG_RTAS_CONSOLE
147 /* If you think you're dying before early_init_dt_scan_rtas() does its
148 * work, you can hard code the token values for your firmware here and
149 * hardcode rtas.base/entry etc.
151 static unsigned int rtas_putchar_token = RTAS_UNKNOWN_SERVICE;
152 static unsigned int rtas_getchar_token = RTAS_UNKNOWN_SERVICE;
154 static void udbg_rtascon_putc(char c)
161 /* Add CRs before LFs */
163 udbg_rtascon_putc('\r');
165 /* if there is more than one character to be displayed, wait a bit */
166 for (tries = 0; tries < 16; tries++) {
167 if (rtas_call(rtas_putchar_token, 1, 1, NULL, c) == 0)
173 static int udbg_rtascon_getc_poll(void)
180 if (rtas_call(rtas_getchar_token, 0, 2, &c))
186 static int udbg_rtascon_getc(void)
190 while ((c = udbg_rtascon_getc_poll()) == -1)
197 void __init udbg_init_rtas_console(void)
199 udbg_putc = udbg_rtascon_putc;
200 udbg_getc = udbg_rtascon_getc;
201 udbg_getc_poll = udbg_rtascon_getc_poll;
203 #endif /* CONFIG_UDBG_RTAS_CONSOLE */
205 void rtas_progress(char *s, unsigned short hex)
207 struct device_node *root;
211 static int display_character, set_indicator;
212 static int display_width, display_lines, form_feed;
213 static const int *row_width;
214 static DEFINE_SPINLOCK(progress_lock);
215 static int current_line;
216 static int pending_newline = 0; /* did last write end with unprinted newline? */
221 if (display_width == 0) {
222 display_width = 0x10;
223 if ((root = of_find_node_by_path("/rtas"))) {
224 if ((p = of_get_property(root,
225 "ibm,display-line-length", NULL)))
227 if ((p = of_get_property(root,
228 "ibm,form-feed", NULL)))
230 if ((p = of_get_property(root,
231 "ibm,display-number-of-lines", NULL)))
233 row_width = of_get_property(root,
234 "ibm,display-truncation-length", NULL);
237 display_character = rtas_token("display-character");
238 set_indicator = rtas_token("set-indicator");
241 if (display_character == RTAS_UNKNOWN_SERVICE) {
242 /* use hex display if available */
243 if (set_indicator != RTAS_UNKNOWN_SERVICE)
244 rtas_call(set_indicator, 3, 1, NULL, 6, 0, hex);
248 spin_lock(&progress_lock);
251 * Last write ended with newline, but we didn't print it since
252 * it would just clear the bottom line of output. Print it now
255 * If no newline is pending and form feed is supported, clear the
256 * display with a form feed; otherwise, print a CR to start output
257 * at the beginning of the line.
259 if (pending_newline) {
260 rtas_call(display_character, 1, 1, NULL, '\r');
261 rtas_call(display_character, 1, 1, NULL, '\n');
266 rtas_call(display_character, 1, 1, NULL,
269 rtas_call(display_character, 1, 1, NULL, '\r');
273 width = row_width[current_line];
275 width = display_width;
278 if (*os == '\n' || *os == '\r') {
279 /* If newline is the last character, save it
280 * until next call to avoid bumping up the
283 if (*os == '\n' && !os[1]) {
286 if (current_line > display_lines-1)
287 current_line = display_lines-1;
288 spin_unlock(&progress_lock);
292 /* RTAS wants CR-LF, not just LF */
295 rtas_call(display_character, 1, 1, NULL, '\r');
296 rtas_call(display_character, 1, 1, NULL, '\n');
298 /* CR might be used to re-draw a line, so we'll
299 * leave it alone and not add LF.
301 rtas_call(display_character, 1, 1, NULL, *os);
305 width = row_width[current_line];
307 width = display_width;
310 rtas_call(display_character, 1, 1, NULL, *os);
315 /* if we overwrite the screen length */
317 while ((*os != 0) && (*os != '\n') && (*os != '\r'))
321 spin_unlock(&progress_lock);
323 EXPORT_SYMBOL(rtas_progress); /* needed by rtas_flash module */
325 int rtas_token(const char *service)
328 if (rtas.dev == NULL)
329 return RTAS_UNKNOWN_SERVICE;
330 tokp = of_get_property(rtas.dev, service, NULL);
331 return tokp ? *tokp : RTAS_UNKNOWN_SERVICE;
333 EXPORT_SYMBOL(rtas_token);
335 int rtas_service_present(const char *service)
337 return rtas_token(service) != RTAS_UNKNOWN_SERVICE;
339 EXPORT_SYMBOL(rtas_service_present);
341 #ifdef CONFIG_RTAS_ERROR_LOGGING
343 * Return the firmware-specified size of the error log buffer
344 * for all rtas calls that require an error buffer argument.
345 * This includes 'check-exception' and 'rtas-last-error'.
347 int rtas_get_error_log_max(void)
349 static int rtas_error_log_max;
350 if (rtas_error_log_max)
351 return rtas_error_log_max;
353 rtas_error_log_max = rtas_token ("rtas-error-log-max");
354 if ((rtas_error_log_max == RTAS_UNKNOWN_SERVICE) ||
355 (rtas_error_log_max > RTAS_ERROR_LOG_MAX)) {
356 printk (KERN_WARNING "RTAS: bad log buffer size %d\n",
358 rtas_error_log_max = RTAS_ERROR_LOG_MAX;
360 return rtas_error_log_max;
362 EXPORT_SYMBOL(rtas_get_error_log_max);
365 static char rtas_err_buf[RTAS_ERROR_LOG_MAX];
366 static int rtas_last_error_token;
368 /** Return a copy of the detailed error text associated with the
369 * most recent failed call to rtas. Because the error text
370 * might go stale if there are any other intervening rtas calls,
371 * this routine must be called atomically with whatever produced
372 * the error (i.e. with rtas.lock still held from the previous call).
374 static char *__fetch_rtas_last_error(char *altbuf)
376 struct rtas_args err_args, save_args;
380 if (rtas_last_error_token == -1)
383 bufsz = rtas_get_error_log_max();
385 err_args.token = rtas_last_error_token;
388 err_args.args[0] = (rtas_arg_t)__pa(rtas_err_buf);
389 err_args.args[1] = bufsz;
390 err_args.args[2] = 0;
392 save_args = rtas.args;
393 rtas.args = err_args;
395 enter_rtas(__pa(&rtas.args));
397 err_args = rtas.args;
398 rtas.args = save_args;
400 /* Log the error in the unlikely case that there was one. */
401 if (unlikely(err_args.args[2] == 0)) {
407 buf = kmalloc(RTAS_ERROR_LOG_MAX, GFP_ATOMIC);
410 memcpy(buf, rtas_err_buf, RTAS_ERROR_LOG_MAX);
416 #define get_errorlog_buffer() kmalloc(RTAS_ERROR_LOG_MAX, GFP_KERNEL)
418 #else /* CONFIG_RTAS_ERROR_LOGGING */
419 #define __fetch_rtas_last_error(x) NULL
420 #define get_errorlog_buffer() NULL
423 int rtas_call(int token, int nargs, int nret, int *outputs, ...)
428 struct rtas_args *rtas_args;
429 char *buff_copy = NULL;
432 if (!rtas.entry || token == RTAS_UNKNOWN_SERVICE)
436 rtas_args = &rtas.args;
438 rtas_args->token = token;
439 rtas_args->nargs = nargs;
440 rtas_args->nret = nret;
441 rtas_args->rets = (rtas_arg_t *)&(rtas_args->args[nargs]);
442 va_start(list, outputs);
443 for (i = 0; i < nargs; ++i)
444 rtas_args->args[i] = va_arg(list, rtas_arg_t);
447 for (i = 0; i < nret; ++i)
448 rtas_args->rets[i] = 0;
450 enter_rtas(__pa(rtas_args));
452 /* A -1 return code indicates that the last command couldn't
453 be completed due to a hardware error. */
454 if (rtas_args->rets[0] == -1)
455 buff_copy = __fetch_rtas_last_error(NULL);
457 if (nret > 1 && outputs != NULL)
458 for (i = 0; i < nret-1; ++i)
459 outputs[i] = rtas_args->rets[i+1];
460 ret = (nret > 0)? rtas_args->rets[0]: 0;
465 log_error(buff_copy, ERR_TYPE_RTAS_LOG, 0);
471 EXPORT_SYMBOL(rtas_call);
473 /* For RTAS_BUSY (-2), delay for 1 millisecond. For an extended busy status
474 * code of 990n, perform the hinted delay of 10^n (last digit) milliseconds.
476 unsigned int rtas_busy_delay_time(int status)
481 if (status == RTAS_BUSY) {
483 } else if (status >= 9900 && status <= 9905) {
484 order = status - 9900;
485 for (ms = 1; order > 0; order--)
491 EXPORT_SYMBOL(rtas_busy_delay_time);
493 /* For an RTAS busy status code, perform the hinted delay. */
494 unsigned int rtas_busy_delay(int status)
499 ms = rtas_busy_delay_time(status);
500 if (ms && need_resched())
505 EXPORT_SYMBOL(rtas_busy_delay);
507 static int rtas_error_rc(int rtas_rc)
512 case -1: /* Hardware Error */
515 case -3: /* Bad indicator/domain/etc */
518 case -9000: /* Isolation error */
521 case -9001: /* Outstanding TCE/PTE */
524 case -9002: /* No usable slot */
528 printk(KERN_ERR "%s: unexpected RTAS error %d\n",
536 int rtas_get_power_level(int powerdomain, int *level)
538 int token = rtas_token("get-power-level");
541 if (token == RTAS_UNKNOWN_SERVICE)
544 while ((rc = rtas_call(token, 1, 2, level, powerdomain)) == RTAS_BUSY)
548 return rtas_error_rc(rc);
551 EXPORT_SYMBOL(rtas_get_power_level);
553 int rtas_set_power_level(int powerdomain, int level, int *setlevel)
555 int token = rtas_token("set-power-level");
558 if (token == RTAS_UNKNOWN_SERVICE)
562 rc = rtas_call(token, 2, 2, setlevel, powerdomain, level);
563 } while (rtas_busy_delay(rc));
566 return rtas_error_rc(rc);
569 EXPORT_SYMBOL(rtas_set_power_level);
571 int rtas_get_sensor(int sensor, int index, int *state)
573 int token = rtas_token("get-sensor-state");
576 if (token == RTAS_UNKNOWN_SERVICE)
580 rc = rtas_call(token, 2, 2, state, sensor, index);
581 } while (rtas_busy_delay(rc));
584 return rtas_error_rc(rc);
587 EXPORT_SYMBOL(rtas_get_sensor);
589 bool rtas_indicator_present(int token, int *maxindex)
591 int proplen, count, i;
592 const struct indicator_elem {
597 indicators = of_get_property(rtas.dev, "rtas-indicators", &proplen);
601 count = proplen / sizeof(struct indicator_elem);
603 for (i = 0; i < count; i++) {
604 if (indicators[i].token != token)
607 *maxindex = indicators[i].maxindex;
613 EXPORT_SYMBOL(rtas_indicator_present);
615 int rtas_set_indicator(int indicator, int index, int new_value)
617 int token = rtas_token("set-indicator");
620 if (token == RTAS_UNKNOWN_SERVICE)
624 rc = rtas_call(token, 3, 1, NULL, indicator, index, new_value);
625 } while (rtas_busy_delay(rc));
628 return rtas_error_rc(rc);
631 EXPORT_SYMBOL(rtas_set_indicator);
634 * Ignoring RTAS extended delay
636 int rtas_set_indicator_fast(int indicator, int index, int new_value)
639 int token = rtas_token("set-indicator");
641 if (token == RTAS_UNKNOWN_SERVICE)
644 rc = rtas_call(token, 3, 1, NULL, indicator, index, new_value);
646 WARN_ON(rc == -2 || (rc >= 9900 && rc <= 9905));
649 return rtas_error_rc(rc);
654 void rtas_restart(char *cmd)
656 if (rtas_flash_term_hook)
657 rtas_flash_term_hook(SYS_RESTART);
658 printk("RTAS system-reboot returned %d\n",
659 rtas_call(rtas_token("system-reboot"), 0, 1, NULL));
663 void rtas_power_off(void)
665 if (rtas_flash_term_hook)
666 rtas_flash_term_hook(SYS_POWER_OFF);
667 /* allow power on only with power button press */
668 printk("RTAS power-off returned %d\n",
669 rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1));
675 if (rtas_flash_term_hook)
676 rtas_flash_term_hook(SYS_HALT);
677 /* allow power on only with power button press */
678 printk("RTAS power-off returned %d\n",
679 rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1));
683 /* Must be in the RMO region, so we place it here */
684 static char rtas_os_term_buf[2048];
686 void rtas_os_term(char *str)
691 * Firmware with the ibm,extended-os-term property is guaranteed
692 * to always return from an ibm,os-term call. Earlier versions without
693 * this property may terminate the partition which we want to avoid
694 * since it interferes with panic_timeout.
696 if (RTAS_UNKNOWN_SERVICE == rtas_token("ibm,os-term") ||
697 RTAS_UNKNOWN_SERVICE == rtas_token("ibm,extended-os-term"))
700 snprintf(rtas_os_term_buf, 2048, "OS panic: %s", str);
703 status = rtas_call(rtas_token("ibm,os-term"), 1, 1, NULL,
704 __pa(rtas_os_term_buf));
705 } while (rtas_busy_delay(status));
708 printk(KERN_EMERG "ibm,os-term call failed %d\n", status);
711 static int ibm_suspend_me_token = RTAS_UNKNOWN_SERVICE;
712 #ifdef CONFIG_PPC_PSERIES
713 static int __rtas_suspend_last_cpu(struct rtas_suspend_me_data *data, int wake_when_done)
715 u16 slb_size = mmu_slb_size;
716 int rc = H_MULTI_THREADS_ACTIVE;
719 slb_set_size(SLB_MIN_SIZE);
720 printk(KERN_DEBUG "calling ibm,suspend-me on cpu %i\n", smp_processor_id());
722 while (rc == H_MULTI_THREADS_ACTIVE && !atomic_read(&data->done) &&
723 !atomic_read(&data->error))
724 rc = rtas_call(data->token, 0, 1, NULL);
726 if (rc || atomic_read(&data->error)) {
727 printk(KERN_DEBUG "ibm,suspend-me returned %d\n", rc);
728 slb_set_size(slb_size);
731 if (atomic_read(&data->error))
732 rc = atomic_read(&data->error);
734 atomic_set(&data->error, rc);
735 pSeries_coalesce_init();
737 if (wake_when_done) {
738 atomic_set(&data->done, 1);
740 for_each_online_cpu(cpu)
741 plpar_hcall_norets(H_PROD, get_hard_smp_processor_id(cpu));
744 if (atomic_dec_return(&data->working) == 0)
745 complete(data->complete);
750 int rtas_suspend_last_cpu(struct rtas_suspend_me_data *data)
752 atomic_inc(&data->working);
753 return __rtas_suspend_last_cpu(data, 0);
756 static int __rtas_suspend_cpu(struct rtas_suspend_me_data *data, int wake_when_done)
759 unsigned long msr_save;
762 atomic_inc(&data->working);
764 /* really need to ensure MSR.EE is off for H_JOIN */
766 mtmsr(msr_save & ~(MSR_EE));
768 while (rc == H_SUCCESS && !atomic_read(&data->done) && !atomic_read(&data->error))
769 rc = plpar_hcall_norets(H_JOIN);
773 if (rc == H_SUCCESS) {
774 /* This cpu was prodded and the suspend is complete. */
776 } else if (rc == H_CONTINUE) {
777 /* All other cpus are in H_JOIN, this cpu does
780 return __rtas_suspend_last_cpu(data, wake_when_done);
782 printk(KERN_ERR "H_JOIN on cpu %i failed with rc = %ld\n",
783 smp_processor_id(), rc);
784 atomic_set(&data->error, rc);
787 if (wake_when_done) {
788 atomic_set(&data->done, 1);
790 /* This cpu did the suspend or got an error; in either case,
791 * we need to prod all other other cpus out of join state.
792 * Extra prods are harmless.
794 for_each_online_cpu(cpu)
795 plpar_hcall_norets(H_PROD, get_hard_smp_processor_id(cpu));
798 if (atomic_dec_return(&data->working) == 0)
799 complete(data->complete);
803 int rtas_suspend_cpu(struct rtas_suspend_me_data *data)
805 return __rtas_suspend_cpu(data, 0);
808 static void rtas_percpu_suspend_me(void *info)
810 __rtas_suspend_cpu((struct rtas_suspend_me_data *)info, 1);
813 enum rtas_cpu_state {
819 static int rtas_cpu_state_change_mask(enum rtas_cpu_state state,
822 if (!cpumask_empty(cpus)) {
829 /* On return cpumask will be altered to indicate CPUs changed.
830 * CPUs with states changed will be set in the mask,
831 * CPUs with status unchanged will be unset in the mask. */
832 static int rtas_cpu_state_change_mask(enum rtas_cpu_state state,
839 if (cpumask_empty(cpus))
842 for_each_cpu(cpu, cpus) {
845 cpuret = cpu_down(cpu);
848 cpuret = cpu_up(cpu);
852 pr_debug("%s: cpu_%s for cpu#%d returned %d.\n",
854 ((state == UP) ? "up" : "down"),
859 /* clear bits for unchanged cpus, return */
860 cpumask_shift_right(cpus, cpus, cpu);
861 cpumask_shift_left(cpus, cpus, cpu);
864 /* clear bit for unchanged cpu, continue */
865 cpumask_clear_cpu(cpu, cpus);
874 int rtas_online_cpus_mask(cpumask_var_t cpus)
878 ret = rtas_cpu_state_change_mask(UP, cpus);
881 cpumask_var_t tmp_mask;
883 if (!alloc_cpumask_var(&tmp_mask, GFP_TEMPORARY))
886 /* Use tmp_mask to preserve cpus mask from first failure */
887 cpumask_copy(tmp_mask, cpus);
888 rtas_offline_cpus_mask(tmp_mask);
889 free_cpumask_var(tmp_mask);
894 EXPORT_SYMBOL(rtas_online_cpus_mask);
896 int rtas_offline_cpus_mask(cpumask_var_t cpus)
898 return rtas_cpu_state_change_mask(DOWN, cpus);
900 EXPORT_SYMBOL(rtas_offline_cpus_mask);
902 int rtas_ibm_suspend_me(struct rtas_args *args)
906 unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
907 struct rtas_suspend_me_data data;
908 DECLARE_COMPLETION_ONSTACK(done);
909 cpumask_var_t offline_mask;
912 if (!rtas_service_present("ibm,suspend-me"))
915 /* Make sure the state is valid */
916 rc = plpar_hcall(H_VASI_STATE, retbuf,
917 ((u64)args->args[0] << 32) | args->args[1]);
922 printk(KERN_ERR "rtas_ibm_suspend_me: vasi_state returned %ld\n",rc);
924 } else if (state == H_VASI_ENABLED) {
925 args->args[args->nargs] = RTAS_NOT_SUSPENDABLE;
927 } else if (state != H_VASI_SUSPENDING) {
928 printk(KERN_ERR "rtas_ibm_suspend_me: vasi_state returned state %ld\n",
930 args->args[args->nargs] = -1;
934 if (!alloc_cpumask_var(&offline_mask, GFP_TEMPORARY))
937 atomic_set(&data.working, 0);
938 atomic_set(&data.done, 0);
939 atomic_set(&data.error, 0);
940 data.token = rtas_token("ibm,suspend-me");
941 data.complete = &done;
943 /* All present CPUs must be online */
944 cpumask_andnot(offline_mask, cpu_present_mask, cpu_online_mask);
945 cpuret = rtas_online_cpus_mask(offline_mask);
947 pr_err("%s: Could not bring present CPUs online.\n", __func__);
948 atomic_set(&data.error, cpuret);
952 stop_topology_update();
954 /* Call function on all CPUs. One of us will make the
957 if (on_each_cpu(rtas_percpu_suspend_me, &data, 0))
958 atomic_set(&data.error, -EINVAL);
960 wait_for_completion(&done);
962 if (atomic_read(&data.error) != 0)
963 printk(KERN_ERR "Error doing global join\n");
965 start_topology_update();
967 /* Take down CPUs not online prior to suspend */
968 cpuret = rtas_offline_cpus_mask(offline_mask);
970 pr_warn("%s: Could not restore CPUs to offline state.\n",
974 free_cpumask_var(offline_mask);
975 return atomic_read(&data.error);
977 #else /* CONFIG_PPC_PSERIES */
978 int rtas_ibm_suspend_me(struct rtas_args *args)
984 asmlinkage int ppc_rtas(struct rtas_args __user *uargs)
986 struct rtas_args args;
988 char *buff_copy, *errbuf = NULL;
992 if (!capable(CAP_SYS_ADMIN))
998 if (copy_from_user(&args, uargs, 3 * sizeof(u32)) != 0)
1002 if (nargs > ARRAY_SIZE(args.args)
1003 || args.nret > ARRAY_SIZE(args.args)
1004 || nargs + args.nret > ARRAY_SIZE(args.args))
1008 if (copy_from_user(args.args, uargs->args,
1009 nargs * sizeof(rtas_arg_t)) != 0)
1012 if (args.token == RTAS_UNKNOWN_SERVICE)
1015 args.rets = &args.args[nargs];
1016 memset(args.rets, 0, args.nret * sizeof(rtas_arg_t));
1018 /* Need to handle ibm,suspend_me call specially */
1019 if (args.token == ibm_suspend_me_token) {
1020 rc = rtas_ibm_suspend_me(&args);
1026 buff_copy = get_errorlog_buffer();
1028 flags = lock_rtas();
1031 enter_rtas(__pa(&rtas.args));
1034 /* A -1 return code indicates that the last command couldn't
1035 be completed due to a hardware error. */
1036 if (args.rets[0] == -1)
1037 errbuf = __fetch_rtas_last_error(buff_copy);
1043 log_error(errbuf, ERR_TYPE_RTAS_LOG, 0);
1048 /* Copy out args. */
1049 if (copy_to_user(uargs->args + nargs,
1051 args.nret * sizeof(rtas_arg_t)) != 0)
1058 * Call early during boot, before mem init or bootmem, to retrieve the RTAS
1059 * informations from the device-tree and allocate the RMO buffer for userland
1062 void __init rtas_initialize(void)
1064 unsigned long rtas_region = RTAS_INSTANTIATE_MAX;
1066 /* Get RTAS dev node and fill up our "rtas" structure with infos
1069 rtas.dev = of_find_node_by_name(NULL, "rtas");
1071 const u32 *basep, *entryp, *sizep;
1073 basep = of_get_property(rtas.dev, "linux,rtas-base", NULL);
1074 sizep = of_get_property(rtas.dev, "rtas-size", NULL);
1075 if (basep != NULL && sizep != NULL) {
1078 entryp = of_get_property(rtas.dev,
1079 "linux,rtas-entry", NULL);
1080 if (entryp == NULL) /* Ugh */
1081 rtas.entry = rtas.base;
1083 rtas.entry = *entryp;
1090 /* If RTAS was found, allocate the RMO buffer for it and look for
1091 * the stop-self token if any
1094 if (machine_is(pseries) && firmware_has_feature(FW_FEATURE_LPAR)) {
1095 rtas_region = min(ppc64_rma_size, RTAS_INSTANTIATE_MAX);
1096 ibm_suspend_me_token = rtas_token("ibm,suspend-me");
1099 rtas_rmo_buf = memblock_alloc_base(RTAS_RMOBUF_MAX, PAGE_SIZE, rtas_region);
1101 #ifdef CONFIG_RTAS_ERROR_LOGGING
1102 rtas_last_error_token = rtas_token("rtas-last-error");
1106 int __init early_init_dt_scan_rtas(unsigned long node,
1107 const char *uname, int depth, void *data)
1109 u32 *basep, *entryp, *sizep;
1111 if (depth != 1 || strcmp(uname, "rtas") != 0)
1114 basep = of_get_flat_dt_prop(node, "linux,rtas-base", NULL);
1115 entryp = of_get_flat_dt_prop(node, "linux,rtas-entry", NULL);
1116 sizep = of_get_flat_dt_prop(node, "rtas-size", NULL);
1118 if (basep && entryp && sizep) {
1120 rtas.entry = *entryp;
1124 #ifdef CONFIG_UDBG_RTAS_CONSOLE
1125 basep = of_get_flat_dt_prop(node, "put-term-char", NULL);
1127 rtas_putchar_token = *basep;
1129 basep = of_get_flat_dt_prop(node, "get-term-char", NULL);
1131 rtas_getchar_token = *basep;
1133 if (rtas_putchar_token != RTAS_UNKNOWN_SERVICE &&
1134 rtas_getchar_token != RTAS_UNKNOWN_SERVICE)
1135 udbg_init_rtas_console();
1143 static arch_spinlock_t timebase_lock;
1144 static u64 timebase = 0;
1146 void __cpuinit rtas_give_timebase(void)
1148 unsigned long flags;
1150 local_irq_save(flags);
1152 arch_spin_lock(&timebase_lock);
1153 rtas_call(rtas_token("freeze-time-base"), 0, 1, NULL);
1154 timebase = get_tb();
1155 arch_spin_unlock(&timebase_lock);
1159 rtas_call(rtas_token("thaw-time-base"), 0, 1, NULL);
1160 local_irq_restore(flags);
1163 void __cpuinit rtas_take_timebase(void)
1167 arch_spin_lock(&timebase_lock);
1168 set_tb(timebase >> 32, timebase & 0xffffffff);
1170 arch_spin_unlock(&timebase_lock);