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/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>
30 #include <asm/hvcall.h>
31 #include <asm/machdep.h>
32 #include <asm/firmware.h>
34 #include <asm/param.h>
35 #include <asm/system.h>
36 #include <asm/delay.h>
37 #include <asm/uaccess.h>
39 #include <asm/syscalls.h>
41 #include <asm/atomic.h>
45 struct rtas_t rtas
= {
46 .lock
= __ARCH_SPIN_LOCK_UNLOCKED
50 DEFINE_SPINLOCK(rtas_data_buf_lock
);
51 EXPORT_SYMBOL(rtas_data_buf_lock
);
53 char rtas_data_buf
[RTAS_DATA_BUF_SIZE
] __cacheline_aligned
;
54 EXPORT_SYMBOL(rtas_data_buf
);
56 unsigned long rtas_rmo_buf
;
59 * If non-NULL, this gets called when the kernel terminates.
60 * This is done like this so rtas_flash can be a module.
62 void (*rtas_flash_term_hook
)(int);
63 EXPORT_SYMBOL(rtas_flash_term_hook
);
65 /* RTAS use home made raw locking instead of spin_lock_irqsave
66 * because those can be called from within really nasty contexts
67 * such as having the timebase stopped which would lockup with
68 * normal locks and spinlock debugging enabled
70 static unsigned long lock_rtas(void)
74 local_irq_save(flags
);
76 arch_spin_lock_flags(&rtas
.lock
, flags
);
80 static void unlock_rtas(unsigned long flags
)
82 arch_spin_unlock(&rtas
.lock
);
83 local_irq_restore(flags
);
88 * call_rtas_display_status and call_rtas_display_status_delay
89 * are designed only for very early low-level debugging, which
90 * is why the token is hard-coded to 10.
92 static void call_rtas_display_status(char c
)
94 struct rtas_args
*args
= &rtas
.args
;
104 args
->rets
= (rtas_arg_t
*)&(args
->args
[1]);
105 args
->args
[0] = (unsigned char)c
;
107 enter_rtas(__pa(args
));
112 static void call_rtas_display_status_delay(char c
)
114 static int pending_newline
= 0; /* did last write end with unprinted newline? */
115 static int width
= 16;
119 call_rtas_display_status(' ');
124 if (pending_newline
) {
125 call_rtas_display_status('\r');
126 call_rtas_display_status('\n');
130 call_rtas_display_status(c
);
136 void __init
udbg_init_rtas_panel(void)
138 udbg_putc
= call_rtas_display_status_delay
;
141 #ifdef CONFIG_UDBG_RTAS_CONSOLE
143 /* If you think you're dying before early_init_dt_scan_rtas() does its
144 * work, you can hard code the token values for your firmware here and
145 * hardcode rtas.base/entry etc.
147 static unsigned int rtas_putchar_token
= RTAS_UNKNOWN_SERVICE
;
148 static unsigned int rtas_getchar_token
= RTAS_UNKNOWN_SERVICE
;
150 static void udbg_rtascon_putc(char c
)
157 /* Add CRs before LFs */
159 udbg_rtascon_putc('\r');
161 /* if there is more than one character to be displayed, wait a bit */
162 for (tries
= 0; tries
< 16; tries
++) {
163 if (rtas_call(rtas_putchar_token
, 1, 1, NULL
, c
) == 0)
169 static int udbg_rtascon_getc_poll(void)
176 if (rtas_call(rtas_getchar_token
, 0, 2, &c
))
182 static int udbg_rtascon_getc(void)
186 while ((c
= udbg_rtascon_getc_poll()) == -1)
193 void __init
udbg_init_rtas_console(void)
195 udbg_putc
= udbg_rtascon_putc
;
196 udbg_getc
= udbg_rtascon_getc
;
197 udbg_getc_poll
= udbg_rtascon_getc_poll
;
199 #endif /* CONFIG_UDBG_RTAS_CONSOLE */
201 void rtas_progress(char *s
, unsigned short hex
)
203 struct device_node
*root
;
207 static int display_character
, set_indicator
;
208 static int display_width
, display_lines
, form_feed
;
209 static const int *row_width
;
210 static DEFINE_SPINLOCK(progress_lock
);
211 static int current_line
;
212 static int pending_newline
= 0; /* did last write end with unprinted newline? */
217 if (display_width
== 0) {
218 display_width
= 0x10;
219 if ((root
= of_find_node_by_path("/rtas"))) {
220 if ((p
= of_get_property(root
,
221 "ibm,display-line-length", NULL
)))
223 if ((p
= of_get_property(root
,
224 "ibm,form-feed", NULL
)))
226 if ((p
= of_get_property(root
,
227 "ibm,display-number-of-lines", NULL
)))
229 row_width
= of_get_property(root
,
230 "ibm,display-truncation-length", NULL
);
233 display_character
= rtas_token("display-character");
234 set_indicator
= rtas_token("set-indicator");
237 if (display_character
== RTAS_UNKNOWN_SERVICE
) {
238 /* use hex display if available */
239 if (set_indicator
!= RTAS_UNKNOWN_SERVICE
)
240 rtas_call(set_indicator
, 3, 1, NULL
, 6, 0, hex
);
244 spin_lock(&progress_lock
);
247 * Last write ended with newline, but we didn't print it since
248 * it would just clear the bottom line of output. Print it now
251 * If no newline is pending and form feed is supported, clear the
252 * display with a form feed; otherwise, print a CR to start output
253 * at the beginning of the line.
255 if (pending_newline
) {
256 rtas_call(display_character
, 1, 1, NULL
, '\r');
257 rtas_call(display_character
, 1, 1, NULL
, '\n');
262 rtas_call(display_character
, 1, 1, NULL
,
265 rtas_call(display_character
, 1, 1, NULL
, '\r');
269 width
= row_width
[current_line
];
271 width
= display_width
;
274 if (*os
== '\n' || *os
== '\r') {
275 /* If newline is the last character, save it
276 * until next call to avoid bumping up the
279 if (*os
== '\n' && !os
[1]) {
282 if (current_line
> display_lines
-1)
283 current_line
= display_lines
-1;
284 spin_unlock(&progress_lock
);
288 /* RTAS wants CR-LF, not just LF */
291 rtas_call(display_character
, 1, 1, NULL
, '\r');
292 rtas_call(display_character
, 1, 1, NULL
, '\n');
294 /* CR might be used to re-draw a line, so we'll
295 * leave it alone and not add LF.
297 rtas_call(display_character
, 1, 1, NULL
, *os
);
301 width
= row_width
[current_line
];
303 width
= display_width
;
306 rtas_call(display_character
, 1, 1, NULL
, *os
);
311 /* if we overwrite the screen length */
313 while ((*os
!= 0) && (*os
!= '\n') && (*os
!= '\r'))
317 spin_unlock(&progress_lock
);
319 EXPORT_SYMBOL(rtas_progress
); /* needed by rtas_flash module */
321 int rtas_token(const char *service
)
324 if (rtas
.dev
== NULL
)
325 return RTAS_UNKNOWN_SERVICE
;
326 tokp
= of_get_property(rtas
.dev
, service
, NULL
);
327 return tokp
? *tokp
: RTAS_UNKNOWN_SERVICE
;
329 EXPORT_SYMBOL(rtas_token
);
331 int rtas_service_present(const char *service
)
333 return rtas_token(service
) != RTAS_UNKNOWN_SERVICE
;
335 EXPORT_SYMBOL(rtas_service_present
);
337 #ifdef CONFIG_RTAS_ERROR_LOGGING
339 * Return the firmware-specified size of the error log buffer
340 * for all rtas calls that require an error buffer argument.
341 * This includes 'check-exception' and 'rtas-last-error'.
343 int rtas_get_error_log_max(void)
345 static int rtas_error_log_max
;
346 if (rtas_error_log_max
)
347 return rtas_error_log_max
;
349 rtas_error_log_max
= rtas_token ("rtas-error-log-max");
350 if ((rtas_error_log_max
== RTAS_UNKNOWN_SERVICE
) ||
351 (rtas_error_log_max
> RTAS_ERROR_LOG_MAX
)) {
352 printk (KERN_WARNING
"RTAS: bad log buffer size %d\n",
354 rtas_error_log_max
= RTAS_ERROR_LOG_MAX
;
356 return rtas_error_log_max
;
358 EXPORT_SYMBOL(rtas_get_error_log_max
);
361 static char rtas_err_buf
[RTAS_ERROR_LOG_MAX
];
362 static int rtas_last_error_token
;
364 /** Return a copy of the detailed error text associated with the
365 * most recent failed call to rtas. Because the error text
366 * might go stale if there are any other intervening rtas calls,
367 * this routine must be called atomically with whatever produced
368 * the error (i.e. with rtas.lock still held from the previous call).
370 static char *__fetch_rtas_last_error(char *altbuf
)
372 struct rtas_args err_args
, save_args
;
376 if (rtas_last_error_token
== -1)
379 bufsz
= rtas_get_error_log_max();
381 err_args
.token
= rtas_last_error_token
;
384 err_args
.args
[0] = (rtas_arg_t
)__pa(rtas_err_buf
);
385 err_args
.args
[1] = bufsz
;
386 err_args
.args
[2] = 0;
388 save_args
= rtas
.args
;
389 rtas
.args
= err_args
;
391 enter_rtas(__pa(&rtas
.args
));
393 err_args
= rtas
.args
;
394 rtas
.args
= save_args
;
396 /* Log the error in the unlikely case that there was one. */
397 if (unlikely(err_args
.args
[2] == 0)) {
403 buf
= kmalloc(RTAS_ERROR_LOG_MAX
, GFP_ATOMIC
);
406 memcpy(buf
, rtas_err_buf
, RTAS_ERROR_LOG_MAX
);
412 #define get_errorlog_buffer() kmalloc(RTAS_ERROR_LOG_MAX, GFP_KERNEL)
414 #else /* CONFIG_RTAS_ERROR_LOGGING */
415 #define __fetch_rtas_last_error(x) NULL
416 #define get_errorlog_buffer() NULL
419 int rtas_call(int token
, int nargs
, int nret
, int *outputs
, ...)
424 struct rtas_args
*rtas_args
;
425 char *buff_copy
= NULL
;
428 if (!rtas
.entry
|| token
== RTAS_UNKNOWN_SERVICE
)
432 rtas_args
= &rtas
.args
;
434 rtas_args
->token
= token
;
435 rtas_args
->nargs
= nargs
;
436 rtas_args
->nret
= nret
;
437 rtas_args
->rets
= (rtas_arg_t
*)&(rtas_args
->args
[nargs
]);
438 va_start(list
, outputs
);
439 for (i
= 0; i
< nargs
; ++i
)
440 rtas_args
->args
[i
] = va_arg(list
, rtas_arg_t
);
443 for (i
= 0; i
< nret
; ++i
)
444 rtas_args
->rets
[i
] = 0;
446 enter_rtas(__pa(rtas_args
));
448 /* A -1 return code indicates that the last command couldn't
449 be completed due to a hardware error. */
450 if (rtas_args
->rets
[0] == -1)
451 buff_copy
= __fetch_rtas_last_error(NULL
);
453 if (nret
> 1 && outputs
!= NULL
)
454 for (i
= 0; i
< nret
-1; ++i
)
455 outputs
[i
] = rtas_args
->rets
[i
+1];
456 ret
= (nret
> 0)? rtas_args
->rets
[0]: 0;
461 log_error(buff_copy
, ERR_TYPE_RTAS_LOG
, 0);
467 EXPORT_SYMBOL(rtas_call
);
469 /* For RTAS_BUSY (-2), delay for 1 millisecond. For an extended busy status
470 * code of 990n, perform the hinted delay of 10^n (last digit) milliseconds.
472 unsigned int rtas_busy_delay_time(int status
)
477 if (status
== RTAS_BUSY
) {
479 } else if (status
>= 9900 && status
<= 9905) {
480 order
= status
- 9900;
481 for (ms
= 1; order
> 0; order
--)
487 EXPORT_SYMBOL(rtas_busy_delay_time
);
489 /* For an RTAS busy status code, perform the hinted delay. */
490 unsigned int rtas_busy_delay(int status
)
495 ms
= rtas_busy_delay_time(status
);
501 EXPORT_SYMBOL(rtas_busy_delay
);
503 static int rtas_error_rc(int rtas_rc
)
508 case -1: /* Hardware Error */
511 case -3: /* Bad indicator/domain/etc */
514 case -9000: /* Isolation error */
517 case -9001: /* Outstanding TCE/PTE */
520 case -9002: /* No usable slot */
524 printk(KERN_ERR
"%s: unexpected RTAS error %d\n",
532 int rtas_get_power_level(int powerdomain
, int *level
)
534 int token
= rtas_token("get-power-level");
537 if (token
== RTAS_UNKNOWN_SERVICE
)
540 while ((rc
= rtas_call(token
, 1, 2, level
, powerdomain
)) == RTAS_BUSY
)
544 return rtas_error_rc(rc
);
547 EXPORT_SYMBOL(rtas_get_power_level
);
549 int rtas_set_power_level(int powerdomain
, int level
, int *setlevel
)
551 int token
= rtas_token("set-power-level");
554 if (token
== RTAS_UNKNOWN_SERVICE
)
558 rc
= rtas_call(token
, 2, 2, setlevel
, powerdomain
, level
);
559 } while (rtas_busy_delay(rc
));
562 return rtas_error_rc(rc
);
565 EXPORT_SYMBOL(rtas_set_power_level
);
567 int rtas_get_sensor(int sensor
, int index
, int *state
)
569 int token
= rtas_token("get-sensor-state");
572 if (token
== RTAS_UNKNOWN_SERVICE
)
576 rc
= rtas_call(token
, 2, 2, state
, sensor
, index
);
577 } while (rtas_busy_delay(rc
));
580 return rtas_error_rc(rc
);
583 EXPORT_SYMBOL(rtas_get_sensor
);
585 bool rtas_indicator_present(int token
, int *maxindex
)
587 int proplen
, count
, i
;
588 const struct indicator_elem
{
593 indicators
= of_get_property(rtas
.dev
, "rtas-indicators", &proplen
);
597 count
= proplen
/ sizeof(struct indicator_elem
);
599 for (i
= 0; i
< count
; i
++) {
600 if (indicators
[i
].token
!= token
)
603 *maxindex
= indicators
[i
].maxindex
;
609 EXPORT_SYMBOL(rtas_indicator_present
);
611 int rtas_set_indicator(int indicator
, int index
, int new_value
)
613 int token
= rtas_token("set-indicator");
616 if (token
== RTAS_UNKNOWN_SERVICE
)
620 rc
= rtas_call(token
, 3, 1, NULL
, indicator
, index
, new_value
);
621 } while (rtas_busy_delay(rc
));
624 return rtas_error_rc(rc
);
627 EXPORT_SYMBOL(rtas_set_indicator
);
630 * Ignoring RTAS extended delay
632 int rtas_set_indicator_fast(int indicator
, int index
, int new_value
)
635 int token
= rtas_token("set-indicator");
637 if (token
== RTAS_UNKNOWN_SERVICE
)
640 rc
= rtas_call(token
, 3, 1, NULL
, indicator
, index
, new_value
);
642 WARN_ON(rc
== -2 || (rc
>= 9900 && rc
<= 9905));
645 return rtas_error_rc(rc
);
650 void rtas_restart(char *cmd
)
652 if (rtas_flash_term_hook
)
653 rtas_flash_term_hook(SYS_RESTART
);
654 printk("RTAS system-reboot returned %d\n",
655 rtas_call(rtas_token("system-reboot"), 0, 1, NULL
));
659 void rtas_power_off(void)
661 if (rtas_flash_term_hook
)
662 rtas_flash_term_hook(SYS_POWER_OFF
);
663 /* allow power on only with power button press */
664 printk("RTAS power-off returned %d\n",
665 rtas_call(rtas_token("power-off"), 2, 1, NULL
, -1, -1));
671 if (rtas_flash_term_hook
)
672 rtas_flash_term_hook(SYS_HALT
);
673 /* allow power on only with power button press */
674 printk("RTAS power-off returned %d\n",
675 rtas_call(rtas_token("power-off"), 2, 1, NULL
, -1, -1));
679 /* Must be in the RMO region, so we place it here */
680 static char rtas_os_term_buf
[2048];
682 void rtas_os_term(char *str
)
687 * Firmware with the ibm,extended-os-term property is guaranteed
688 * to always return from an ibm,os-term call. Earlier versions without
689 * this property may terminate the partition which we want to avoid
690 * since it interferes with panic_timeout.
692 if (RTAS_UNKNOWN_SERVICE
== rtas_token("ibm,os-term") ||
693 RTAS_UNKNOWN_SERVICE
== rtas_token("ibm,extended-os-term"))
696 snprintf(rtas_os_term_buf
, 2048, "OS panic: %s", str
);
699 status
= rtas_call(rtas_token("ibm,os-term"), 1, 1, NULL
,
700 __pa(rtas_os_term_buf
));
701 } while (rtas_busy_delay(status
));
704 printk(KERN_EMERG
"ibm,os-term call failed %d\n", status
);
707 static int ibm_suspend_me_token
= RTAS_UNKNOWN_SERVICE
;
708 #ifdef CONFIG_PPC_PSERIES
709 static int __rtas_suspend_last_cpu(struct rtas_suspend_me_data
*data
, int wake_when_done
)
711 u16 slb_size
= mmu_slb_size
;
712 int rc
= H_MULTI_THREADS_ACTIVE
;
715 slb_set_size(SLB_MIN_SIZE
);
716 printk(KERN_DEBUG
"calling ibm,suspend-me on cpu %i\n", smp_processor_id());
718 while (rc
== H_MULTI_THREADS_ACTIVE
&& !atomic_read(&data
->done
) &&
719 !atomic_read(&data
->error
))
720 rc
= rtas_call(data
->token
, 0, 1, NULL
);
722 if (rc
|| atomic_read(&data
->error
)) {
723 printk(KERN_DEBUG
"ibm,suspend-me returned %d\n", rc
);
724 slb_set_size(slb_size
);
727 if (atomic_read(&data
->error
))
728 rc
= atomic_read(&data
->error
);
730 atomic_set(&data
->error
, rc
);
732 if (wake_when_done
) {
733 atomic_set(&data
->done
, 1);
735 for_each_online_cpu(cpu
)
736 plpar_hcall_norets(H_PROD
, get_hard_smp_processor_id(cpu
));
739 if (atomic_dec_return(&data
->working
) == 0)
740 complete(data
->complete
);
745 int rtas_suspend_last_cpu(struct rtas_suspend_me_data
*data
)
747 atomic_inc(&data
->working
);
748 return __rtas_suspend_last_cpu(data
, 0);
751 static int __rtas_suspend_cpu(struct rtas_suspend_me_data
*data
, int wake_when_done
)
754 unsigned long msr_save
;
757 atomic_inc(&data
->working
);
759 /* really need to ensure MSR.EE is off for H_JOIN */
761 mtmsr(msr_save
& ~(MSR_EE
));
763 while (rc
== H_SUCCESS
&& !atomic_read(&data
->done
) && !atomic_read(&data
->error
))
764 rc
= plpar_hcall_norets(H_JOIN
);
768 if (rc
== H_SUCCESS
) {
769 /* This cpu was prodded and the suspend is complete. */
771 } else if (rc
== H_CONTINUE
) {
772 /* All other cpus are in H_JOIN, this cpu does
775 return __rtas_suspend_last_cpu(data
, wake_when_done
);
777 printk(KERN_ERR
"H_JOIN on cpu %i failed with rc = %ld\n",
778 smp_processor_id(), rc
);
779 atomic_set(&data
->error
, rc
);
782 if (wake_when_done
) {
783 atomic_set(&data
->done
, 1);
785 /* This cpu did the suspend or got an error; in either case,
786 * we need to prod all other other cpus out of join state.
787 * Extra prods are harmless.
789 for_each_online_cpu(cpu
)
790 plpar_hcall_norets(H_PROD
, get_hard_smp_processor_id(cpu
));
793 if (atomic_dec_return(&data
->working
) == 0)
794 complete(data
->complete
);
798 int rtas_suspend_cpu(struct rtas_suspend_me_data
*data
)
800 return __rtas_suspend_cpu(data
, 0);
803 static void rtas_percpu_suspend_me(void *info
)
805 __rtas_suspend_cpu((struct rtas_suspend_me_data
*)info
, 1);
808 static int rtas_ibm_suspend_me(struct rtas_args
*args
)
812 unsigned long retbuf
[PLPAR_HCALL_BUFSIZE
];
813 struct rtas_suspend_me_data data
;
814 DECLARE_COMPLETION_ONSTACK(done
);
816 if (!rtas_service_present("ibm,suspend-me"))
819 /* Make sure the state is valid */
820 rc
= plpar_hcall(H_VASI_STATE
, retbuf
,
821 ((u64
)args
->args
[0] << 32) | args
->args
[1]);
826 printk(KERN_ERR
"rtas_ibm_suspend_me: vasi_state returned %ld\n",rc
);
828 } else if (state
== H_VASI_ENABLED
) {
829 args
->args
[args
->nargs
] = RTAS_NOT_SUSPENDABLE
;
831 } else if (state
!= H_VASI_SUSPENDING
) {
832 printk(KERN_ERR
"rtas_ibm_suspend_me: vasi_state returned state %ld\n",
834 args
->args
[args
->nargs
] = -1;
838 atomic_set(&data
.working
, 0);
839 atomic_set(&data
.done
, 0);
840 atomic_set(&data
.error
, 0);
841 data
.token
= rtas_token("ibm,suspend-me");
842 data
.complete
= &done
;
844 /* Call function on all CPUs. One of us will make the
847 if (on_each_cpu(rtas_percpu_suspend_me
, &data
, 0))
848 atomic_set(&data
.error
, -EINVAL
);
850 wait_for_completion(&done
);
852 if (atomic_read(&data
.error
) != 0)
853 printk(KERN_ERR
"Error doing global join\n");
855 return atomic_read(&data
.error
);
857 #else /* CONFIG_PPC_PSERIES */
858 static int rtas_ibm_suspend_me(struct rtas_args
*args
)
864 asmlinkage
int ppc_rtas(struct rtas_args __user
*uargs
)
866 struct rtas_args args
;
868 char *buff_copy
, *errbuf
= NULL
;
872 if (!capable(CAP_SYS_ADMIN
))
875 if (copy_from_user(&args
, uargs
, 3 * sizeof(u32
)) != 0)
879 if (nargs
> ARRAY_SIZE(args
.args
)
880 || args
.nret
> ARRAY_SIZE(args
.args
)
881 || nargs
+ args
.nret
> ARRAY_SIZE(args
.args
))
885 if (copy_from_user(args
.args
, uargs
->args
,
886 nargs
* sizeof(rtas_arg_t
)) != 0)
889 if (args
.token
== RTAS_UNKNOWN_SERVICE
)
892 args
.rets
= &args
.args
[nargs
];
893 memset(args
.rets
, 0, args
.nret
* sizeof(rtas_arg_t
));
895 /* Need to handle ibm,suspend_me call specially */
896 if (args
.token
== ibm_suspend_me_token
) {
897 rc
= rtas_ibm_suspend_me(&args
);
903 buff_copy
= get_errorlog_buffer();
908 enter_rtas(__pa(&rtas
.args
));
911 /* A -1 return code indicates that the last command couldn't
912 be completed due to a hardware error. */
913 if (args
.rets
[0] == -1)
914 errbuf
= __fetch_rtas_last_error(buff_copy
);
920 log_error(errbuf
, ERR_TYPE_RTAS_LOG
, 0);
926 if (copy_to_user(uargs
->args
+ nargs
,
928 args
.nret
* sizeof(rtas_arg_t
)) != 0)
935 * Call early during boot, before mem init or bootmem, to retrieve the RTAS
936 * informations from the device-tree and allocate the RMO buffer for userland
939 void __init
rtas_initialize(void)
941 unsigned long rtas_region
= RTAS_INSTANTIATE_MAX
;
943 /* Get RTAS dev node and fill up our "rtas" structure with infos
946 rtas
.dev
= of_find_node_by_name(NULL
, "rtas");
948 const u32
*basep
, *entryp
, *sizep
;
950 basep
= of_get_property(rtas
.dev
, "linux,rtas-base", NULL
);
951 sizep
= of_get_property(rtas
.dev
, "rtas-size", NULL
);
952 if (basep
!= NULL
&& sizep
!= NULL
) {
955 entryp
= of_get_property(rtas
.dev
,
956 "linux,rtas-entry", NULL
);
957 if (entryp
== NULL
) /* Ugh */
958 rtas
.entry
= rtas
.base
;
960 rtas
.entry
= *entryp
;
967 /* If RTAS was found, allocate the RMO buffer for it and look for
968 * the stop-self token if any
971 if (machine_is(pseries
) && firmware_has_feature(FW_FEATURE_LPAR
)) {
972 rtas_region
= min(memblock
.rmo_size
, RTAS_INSTANTIATE_MAX
);
973 ibm_suspend_me_token
= rtas_token("ibm,suspend-me");
976 rtas_rmo_buf
= memblock_alloc_base(RTAS_RMOBUF_MAX
, PAGE_SIZE
, rtas_region
);
978 #ifdef CONFIG_RTAS_ERROR_LOGGING
979 rtas_last_error_token
= rtas_token("rtas-last-error");
983 int __init
early_init_dt_scan_rtas(unsigned long node
,
984 const char *uname
, int depth
, void *data
)
986 u32
*basep
, *entryp
, *sizep
;
988 if (depth
!= 1 || strcmp(uname
, "rtas") != 0)
991 basep
= of_get_flat_dt_prop(node
, "linux,rtas-base", NULL
);
992 entryp
= of_get_flat_dt_prop(node
, "linux,rtas-entry", NULL
);
993 sizep
= of_get_flat_dt_prop(node
, "rtas-size", NULL
);
995 if (basep
&& entryp
&& sizep
) {
997 rtas
.entry
= *entryp
;
1001 #ifdef CONFIG_UDBG_RTAS_CONSOLE
1002 basep
= of_get_flat_dt_prop(node
, "put-term-char", NULL
);
1004 rtas_putchar_token
= *basep
;
1006 basep
= of_get_flat_dt_prop(node
, "get-term-char", NULL
);
1008 rtas_getchar_token
= *basep
;
1010 if (rtas_putchar_token
!= RTAS_UNKNOWN_SERVICE
&&
1011 rtas_getchar_token
!= RTAS_UNKNOWN_SERVICE
)
1012 udbg_init_rtas_console();
1020 static arch_spinlock_t timebase_lock
;
1021 static u64 timebase
= 0;
1023 void __cpuinit
rtas_give_timebase(void)
1025 unsigned long flags
;
1027 local_irq_save(flags
);
1029 arch_spin_lock(&timebase_lock
);
1030 rtas_call(rtas_token("freeze-time-base"), 0, 1, NULL
);
1031 timebase
= get_tb();
1032 arch_spin_unlock(&timebase_lock
);
1036 rtas_call(rtas_token("thaw-time-base"), 0, 1, NULL
);
1037 local_irq_restore(flags
);
1040 void __cpuinit
rtas_take_timebase(void)
1044 arch_spin_lock(&timebase_lock
);
1045 set_tb(timebase
>> 32, timebase
& 0xffffffff);
1047 arch_spin_unlock(&timebase_lock
);