blob: 271ff6318eda483cb7ee2f77fce128fb86fe5a8e [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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>
Randy Dunlapa9415642006-01-11 12:17:48 -080020#include <linux/capability.h>
Benjamin Herrenschmidt21fe3302005-11-07 16:41:59 +110021#include <linux/delay.h>
Nathan Lynch8f5c7572007-11-14 03:15:13 +110022#include <linux/smp.h>
23#include <linux/completion.h>
24#include <linux/cpumask.h>
Yinghai Lu95f72d12010-07-12 14:36:09 +100025#include <linux/memblock.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090026#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070027
28#include <asm/prom.h>
29#include <asm/rtas.h>
Michael Ellerman31a7f672006-01-31 17:17:47 +110030#include <asm/hvcall.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070031#include <asm/machdep.h>
Benjamin Herrenschmidte8222502006-03-28 23:15:54 +110032#include <asm/firmware.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070033#include <asm/page.h>
34#include <asm/param.h>
35#include <asm/system.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070036#include <asm/delay.h>
37#include <asm/uaccess.h>
Michael Ellerman296167a2006-01-11 11:54:09 +110038#include <asm/udbg.h>
Arnd Bergmanna7f31842006-03-23 00:00:08 +010039#include <asm/syscalls.h>
Nathan Lynch8f5c7572007-11-14 03:15:13 +110040#include <asm/smp.h>
41#include <asm/atomic.h>
Benjamin Herrenschmidtc4007a22009-06-16 16:42:50 +000042#include <asm/time.h>
Brian King46db2f82009-08-28 12:06:29 +000043#include <asm/mmu.h>
Jesse Larrew3b7a27d2010-12-01 12:31:26 +000044#include <asm/topology.h>
Brian King9ee820f2011-05-04 16:01:20 +100045#include <asm/pSeries_reconfig.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070046
Paul Mackerras033ef332005-10-26 17:05:24 +100047struct rtas_t rtas = {
Thomas Gleixneredc35bd2009-12-03 12:38:57 +010048 .lock = __ARCH_SPIN_LOCK_UNLOCKED
Linus Torvalds1da177e2005-04-16 15:20:36 -070049};
Michael Ellermanab3ab742006-06-23 18:20:11 +100050EXPORT_SYMBOL(rtas);
Linus Torvalds1da177e2005-04-16 15:20:36 -070051
Linus Torvalds1da177e2005-04-16 15:20:36 -070052DEFINE_SPINLOCK(rtas_data_buf_lock);
Michael Ellermanab3ab742006-06-23 18:20:11 +100053EXPORT_SYMBOL(rtas_data_buf_lock);
54
Paul Mackerras033ef332005-10-26 17:05:24 +100055char rtas_data_buf[RTAS_DATA_BUF_SIZE] __cacheline_aligned;
Michael Ellermanab3ab742006-06-23 18:20:11 +100056EXPORT_SYMBOL(rtas_data_buf);
57
Linus Torvalds1da177e2005-04-16 15:20:36 -070058unsigned long rtas_rmo_buf;
59
Paul Mackerras033ef332005-10-26 17:05:24 +100060/*
Paul Mackerrasf4fcbbe2005-11-03 14:41:19 +110061 * If non-NULL, this gets called when the kernel terminates.
62 * This is done like this so rtas_flash can be a module.
63 */
64void (*rtas_flash_term_hook)(int);
65EXPORT_SYMBOL(rtas_flash_term_hook);
66
Benjamin Herrenschmidtf97bb362009-06-16 16:42:49 +000067/* RTAS use home made raw locking instead of spin_lock_irqsave
68 * because those can be called from within really nasty contexts
69 * such as having the timebase stopped which would lockup with
70 * normal locks and spinlock debugging enabled
71 */
72static unsigned long lock_rtas(void)
73{
74 unsigned long flags;
75
76 local_irq_save(flags);
77 preempt_disable();
Thomas Gleixner0199c4e2009-12-02 20:01:25 +010078 arch_spin_lock_flags(&rtas.lock, flags);
Benjamin Herrenschmidtf97bb362009-06-16 16:42:49 +000079 return flags;
80}
81
82static void unlock_rtas(unsigned long flags)
83{
Thomas Gleixner0199c4e2009-12-02 20:01:25 +010084 arch_spin_unlock(&rtas.lock);
Benjamin Herrenschmidtf97bb362009-06-16 16:42:49 +000085 local_irq_restore(flags);
86 preempt_enable();
87}
88
Paul Mackerrasf4fcbbe2005-11-03 14:41:19 +110089/*
Paul Mackerras033ef332005-10-26 17:05:24 +100090 * call_rtas_display_status and call_rtas_display_status_delay
91 * are designed only for very early low-level debugging, which
92 * is why the token is hard-coded to 10.
93 */
Michael Ellerman296167a2006-01-11 11:54:09 +110094static void call_rtas_display_status(char c)
Linus Torvalds1da177e2005-04-16 15:20:36 -070095{
96 struct rtas_args *args = &rtas.args;
97 unsigned long s;
98
99 if (!rtas.base)
100 return;
Benjamin Herrenschmidtf97bb362009-06-16 16:42:49 +0000101 s = lock_rtas();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102
103 args->token = 10;
104 args->nargs = 1;
105 args->nret = 1;
106 args->rets = (rtas_arg_t *)&(args->args[1]);
Michael Ellerman296167a2006-01-11 11:54:09 +1100107 args->args[0] = (unsigned char)c;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108
109 enter_rtas(__pa(args));
110
Benjamin Herrenschmidtf97bb362009-06-16 16:42:49 +0000111 unlock_rtas(s);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112}
113
Michael Ellerman296167a2006-01-11 11:54:09 +1100114static void call_rtas_display_status_delay(char c)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115{
116 static int pending_newline = 0; /* did last write end with unprinted newline? */
117 static int width = 16;
118
119 if (c == '\n') {
120 while (width-- > 0)
121 call_rtas_display_status(' ');
122 width = 16;
Benjamin Herrenschmidt21fe3302005-11-07 16:41:59 +1100123 mdelay(500);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124 pending_newline = 1;
125 } else {
126 if (pending_newline) {
127 call_rtas_display_status('\r');
128 call_rtas_display_status('\n');
129 }
130 pending_newline = 0;
131 if (width--) {
132 call_rtas_display_status(c);
133 udelay(10000);
134 }
135 }
136}
137
Michael Ellermancc46bb92006-06-23 18:20:16 +1000138void __init udbg_init_rtas_panel(void)
Michael Ellerman296167a2006-01-11 11:54:09 +1100139{
140 udbg_putc = call_rtas_display_status_delay;
141}
142
Michael Ellermancc46bb92006-06-23 18:20:16 +1000143#ifdef CONFIG_UDBG_RTAS_CONSOLE
144
145/* If you think you're dying before early_init_dt_scan_rtas() does its
146 * work, you can hard code the token values for your firmware here and
147 * hardcode rtas.base/entry etc.
148 */
149static unsigned int rtas_putchar_token = RTAS_UNKNOWN_SERVICE;
150static unsigned int rtas_getchar_token = RTAS_UNKNOWN_SERVICE;
151
152static void udbg_rtascon_putc(char c)
153{
154 int tries;
155
156 if (!rtas.base)
157 return;
158
159 /* Add CRs before LFs */
160 if (c == '\n')
161 udbg_rtascon_putc('\r');
162
163 /* if there is more than one character to be displayed, wait a bit */
164 for (tries = 0; tries < 16; tries++) {
165 if (rtas_call(rtas_putchar_token, 1, 1, NULL, c) == 0)
166 break;
167 udelay(1000);
168 }
169}
170
171static int udbg_rtascon_getc_poll(void)
172{
173 int c;
174
175 if (!rtas.base)
176 return -1;
177
178 if (rtas_call(rtas_getchar_token, 0, 2, &c))
179 return -1;
180
181 return c;
182}
183
184static int udbg_rtascon_getc(void)
185{
186 int c;
187
188 while ((c = udbg_rtascon_getc_poll()) == -1)
189 ;
190
191 return c;
192}
193
194
195void __init udbg_init_rtas_console(void)
196{
197 udbg_putc = udbg_rtascon_putc;
198 udbg_getc = udbg_rtascon_getc;
199 udbg_getc_poll = udbg_rtascon_getc_poll;
200}
201#endif /* CONFIG_UDBG_RTAS_CONSOLE */
202
Paul Mackerras033ef332005-10-26 17:05:24 +1000203void rtas_progress(char *s, unsigned short hex)
Arnd Bergmann6566c6f2005-06-23 09:43:28 +1000204{
205 struct device_node *root;
Jeremy Kerra7f67bd2006-07-12 15:35:54 +1000206 int width;
207 const int *p;
Arnd Bergmann6566c6f2005-06-23 09:43:28 +1000208 char *os;
209 static int display_character, set_indicator;
Jeremy Kerra7f67bd2006-07-12 15:35:54 +1000210 static int display_width, display_lines, form_feed;
Tobias Klauserc5a69d52007-02-17 20:11:19 +0100211 static const int *row_width;
Arnd Bergmann6566c6f2005-06-23 09:43:28 +1000212 static DEFINE_SPINLOCK(progress_lock);
Mike Strosaker8f586b22005-06-23 16:09:41 +1000213 static int current_line;
Arnd Bergmann6566c6f2005-06-23 09:43:28 +1000214 static int pending_newline = 0; /* did last write end with unprinted newline? */
215
216 if (!rtas.base)
217 return;
218
Mike Strosaker8f586b22005-06-23 16:09:41 +1000219 if (display_width == 0) {
220 display_width = 0x10;
Stephen Rothwell8c8dc322007-04-24 13:50:55 +1000221 if ((root = of_find_node_by_path("/rtas"))) {
Stephen Rothwelle2eb6392007-04-03 22:26:41 +1000222 if ((p = of_get_property(root,
Mike Strosaker8f586b22005-06-23 16:09:41 +1000223 "ibm,display-line-length", NULL)))
224 display_width = *p;
Stephen Rothwelle2eb6392007-04-03 22:26:41 +1000225 if ((p = of_get_property(root,
Mike Strosaker8f586b22005-06-23 16:09:41 +1000226 "ibm,form-feed", NULL)))
227 form_feed = *p;
Stephen Rothwelle2eb6392007-04-03 22:26:41 +1000228 if ((p = of_get_property(root,
Mike Strosaker8f586b22005-06-23 16:09:41 +1000229 "ibm,display-number-of-lines", NULL)))
230 display_lines = *p;
Stephen Rothwelle2eb6392007-04-03 22:26:41 +1000231 row_width = of_get_property(root,
Mike Strosaker8f586b22005-06-23 16:09:41 +1000232 "ibm,display-truncation-length", NULL);
Stephen Rothwell8c8dc322007-04-24 13:50:55 +1000233 of_node_put(root);
Mike Strosaker8f586b22005-06-23 16:09:41 +1000234 }
Arnd Bergmann6566c6f2005-06-23 09:43:28 +1000235 display_character = rtas_token("display-character");
236 set_indicator = rtas_token("set-indicator");
237 }
238
239 if (display_character == RTAS_UNKNOWN_SERVICE) {
240 /* use hex display if available */
241 if (set_indicator != RTAS_UNKNOWN_SERVICE)
242 rtas_call(set_indicator, 3, 1, NULL, 6, 0, hex);
243 return;
244 }
245
246 spin_lock(&progress_lock);
247
248 /*
249 * Last write ended with newline, but we didn't print it since
250 * it would just clear the bottom line of output. Print it now
251 * instead.
252 *
Mike Strosaker8f586b22005-06-23 16:09:41 +1000253 * If no newline is pending and form feed is supported, clear the
254 * display with a form feed; otherwise, print a CR to start output
255 * at the beginning of the line.
Arnd Bergmann6566c6f2005-06-23 09:43:28 +1000256 */
257 if (pending_newline) {
258 rtas_call(display_character, 1, 1, NULL, '\r');
259 rtas_call(display_character, 1, 1, NULL, '\n');
260 pending_newline = 0;
261 } else {
Mike Strosaker8f586b22005-06-23 16:09:41 +1000262 current_line = 0;
263 if (form_feed)
264 rtas_call(display_character, 1, 1, NULL,
265 (char)form_feed);
266 else
267 rtas_call(display_character, 1, 1, NULL, '\r');
Arnd Bergmann6566c6f2005-06-23 09:43:28 +1000268 }
269
Mike Strosaker8f586b22005-06-23 16:09:41 +1000270 if (row_width)
271 width = row_width[current_line];
272 else
273 width = display_width;
Arnd Bergmann6566c6f2005-06-23 09:43:28 +1000274 os = s;
275 while (*os) {
276 if (*os == '\n' || *os == '\r') {
Arnd Bergmann6566c6f2005-06-23 09:43:28 +1000277 /* If newline is the last character, save it
278 * until next call to avoid bumping up the
279 * display output.
280 */
281 if (*os == '\n' && !os[1]) {
282 pending_newline = 1;
Mike Strosaker8f586b22005-06-23 16:09:41 +1000283 current_line++;
284 if (current_line > display_lines-1)
285 current_line = display_lines-1;
Arnd Bergmann6566c6f2005-06-23 09:43:28 +1000286 spin_unlock(&progress_lock);
287 return;
288 }
289
290 /* RTAS wants CR-LF, not just LF */
291
292 if (*os == '\n') {
293 rtas_call(display_character, 1, 1, NULL, '\r');
294 rtas_call(display_character, 1, 1, NULL, '\n');
295 } else {
296 /* CR might be used to re-draw a line, so we'll
297 * leave it alone and not add LF.
298 */
299 rtas_call(display_character, 1, 1, NULL, *os);
300 }
301
Mike Strosaker8f586b22005-06-23 16:09:41 +1000302 if (row_width)
303 width = row_width[current_line];
304 else
305 width = display_width;
Arnd Bergmann6566c6f2005-06-23 09:43:28 +1000306 } else {
307 width--;
308 rtas_call(display_character, 1, 1, NULL, *os);
309 }
310
311 os++;
312
313 /* if we overwrite the screen length */
314 if (width <= 0)
315 while ((*os != 0) && (*os != '\n') && (*os != '\r'))
316 os++;
317 }
318
Arnd Bergmann6566c6f2005-06-23 09:43:28 +1000319 spin_unlock(&progress_lock);
320}
Paul Mackerrasf4fcbbe2005-11-03 14:41:19 +1100321EXPORT_SYMBOL(rtas_progress); /* needed by rtas_flash module */
Arnd Bergmann6566c6f2005-06-23 09:43:28 +1000322
Paul Mackerras033ef332005-10-26 17:05:24 +1000323int rtas_token(const char *service)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324{
Jeremy Kerra7f67bd2006-07-12 15:35:54 +1000325 const int *tokp;
Paul Mackerras033ef332005-10-26 17:05:24 +1000326 if (rtas.dev == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327 return RTAS_UNKNOWN_SERVICE;
Stephen Rothwelle2eb6392007-04-03 22:26:41 +1000328 tokp = of_get_property(rtas.dev, service, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329 return tokp ? *tokp : RTAS_UNKNOWN_SERVICE;
330}
Michael Ellermanab3ab742006-06-23 18:20:11 +1000331EXPORT_SYMBOL(rtas_token);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332
Nathan Lynchf2d6d2d2006-12-06 18:50:45 -0600333int rtas_service_present(const char *service)
334{
335 return rtas_token(service) != RTAS_UNKNOWN_SERVICE;
336}
337EXPORT_SYMBOL(rtas_service_present);
338
Paul Mackerras033ef332005-10-26 17:05:24 +1000339#ifdef CONFIG_RTAS_ERROR_LOGGING
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340/*
341 * Return the firmware-specified size of the error log buffer
342 * for all rtas calls that require an error buffer argument.
343 * This includes 'check-exception' and 'rtas-last-error'.
344 */
345int rtas_get_error_log_max(void)
346{
347 static int rtas_error_log_max;
348 if (rtas_error_log_max)
349 return rtas_error_log_max;
350
351 rtas_error_log_max = rtas_token ("rtas-error-log-max");
352 if ((rtas_error_log_max == RTAS_UNKNOWN_SERVICE) ||
353 (rtas_error_log_max > RTAS_ERROR_LOG_MAX)) {
Paul Mackerras033ef332005-10-26 17:05:24 +1000354 printk (KERN_WARNING "RTAS: bad log buffer size %d\n",
355 rtas_error_log_max);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356 rtas_error_log_max = RTAS_ERROR_LOG_MAX;
357 }
358 return rtas_error_log_max;
359}
Paul Mackerras033ef332005-10-26 17:05:24 +1000360EXPORT_SYMBOL(rtas_get_error_log_max);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361
362
Michael Ellerman1c21a292008-05-08 14:27:19 +1000363static char rtas_err_buf[RTAS_ERROR_LOG_MAX];
364static int rtas_last_error_token;
Paul Mackerras033ef332005-10-26 17:05:24 +1000365
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366/** Return a copy of the detailed error text associated with the
367 * most recent failed call to rtas. Because the error text
368 * might go stale if there are any other intervening rtas calls,
369 * this routine must be called atomically with whatever produced
370 * the error (i.e. with rtas.lock still held from the previous call).
371 */
Paul Mackerras033ef332005-10-26 17:05:24 +1000372static char *__fetch_rtas_last_error(char *altbuf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373{
374 struct rtas_args err_args, save_args;
375 u32 bufsz;
Paul Mackerras033ef332005-10-26 17:05:24 +1000376 char *buf = NULL;
377
378 if (rtas_last_error_token == -1)
379 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380
381 bufsz = rtas_get_error_log_max();
382
Paul Mackerras033ef332005-10-26 17:05:24 +1000383 err_args.token = rtas_last_error_token;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384 err_args.nargs = 2;
385 err_args.nret = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386 err_args.args[0] = (rtas_arg_t)__pa(rtas_err_buf);
387 err_args.args[1] = bufsz;
388 err_args.args[2] = 0;
389
390 save_args = rtas.args;
391 rtas.args = err_args;
392
393 enter_rtas(__pa(&rtas.args));
394
395 err_args = rtas.args;
396 rtas.args = save_args;
397
Paul Mackerras033ef332005-10-26 17:05:24 +1000398 /* Log the error in the unlikely case that there was one. */
399 if (unlikely(err_args.args[2] == 0)) {
400 if (altbuf) {
401 buf = altbuf;
402 } else {
403 buf = rtas_err_buf;
404 if (mem_init_done)
405 buf = kmalloc(RTAS_ERROR_LOG_MAX, GFP_ATOMIC);
406 }
407 if (buf)
408 memcpy(buf, rtas_err_buf, RTAS_ERROR_LOG_MAX);
409 }
410
411 return buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412}
413
Paul Mackerras033ef332005-10-26 17:05:24 +1000414#define get_errorlog_buffer() kmalloc(RTAS_ERROR_LOG_MAX, GFP_KERNEL)
415
416#else /* CONFIG_RTAS_ERROR_LOGGING */
417#define __fetch_rtas_last_error(x) NULL
418#define get_errorlog_buffer() NULL
419#endif
420
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421int rtas_call(int token, int nargs, int nret, int *outputs, ...)
422{
423 va_list list;
Paul Mackerras033ef332005-10-26 17:05:24 +1000424 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425 unsigned long s;
426 struct rtas_args *rtas_args;
Paul Mackerras033ef332005-10-26 17:05:24 +1000427 char *buff_copy = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428 int ret;
429
Michael Ellerman24da3dd2006-06-23 18:20:10 +1000430 if (!rtas.entry || token == RTAS_UNKNOWN_SERVICE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431 return -1;
432
Benjamin Herrenschmidtf97bb362009-06-16 16:42:49 +0000433 s = lock_rtas();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434 rtas_args = &rtas.args;
435
436 rtas_args->token = token;
437 rtas_args->nargs = nargs;
438 rtas_args->nret = nret;
439 rtas_args->rets = (rtas_arg_t *)&(rtas_args->args[nargs]);
440 va_start(list, outputs);
Paul Mackerras033ef332005-10-26 17:05:24 +1000441 for (i = 0; i < nargs; ++i)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442 rtas_args->args[i] = va_arg(list, rtas_arg_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443 va_end(list);
444
445 for (i = 0; i < nret; ++i)
446 rtas_args->rets[i] = 0;
447
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448 enter_rtas(__pa(rtas_args));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449
450 /* A -1 return code indicates that the last command couldn't
451 be completed due to a hardware error. */
452 if (rtas_args->rets[0] == -1)
Paul Mackerras033ef332005-10-26 17:05:24 +1000453 buff_copy = __fetch_rtas_last_error(NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454
455 if (nret > 1 && outputs != NULL)
456 for (i = 0; i < nret-1; ++i)
457 outputs[i] = rtas_args->rets[i+1];
458 ret = (nret > 0)? rtas_args->rets[0]: 0;
459
Benjamin Herrenschmidtf97bb362009-06-16 16:42:49 +0000460 unlock_rtas(s);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461
462 if (buff_copy) {
463 log_error(buff_copy, ERR_TYPE_RTAS_LOG, 0);
464 if (mem_init_done)
465 kfree(buff_copy);
466 }
467 return ret;
468}
Michael Ellermanab3ab742006-06-23 18:20:11 +1000469EXPORT_SYMBOL(rtas_call);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470
John Rose507279d2006-06-05 16:31:48 -0500471/* For RTAS_BUSY (-2), delay for 1 millisecond. For an extended busy status
472 * code of 990n, perform the hinted delay of 10^n (last digit) milliseconds.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473 */
John Rose507279d2006-06-05 16:31:48 -0500474unsigned int rtas_busy_delay_time(int status)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475{
John Rose507279d2006-06-05 16:31:48 -0500476 int order;
477 unsigned int ms = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478
John Rose507279d2006-06-05 16:31:48 -0500479 if (status == RTAS_BUSY) {
480 ms = 1;
481 } else if (status >= 9900 && status <= 9905) {
482 order = status - 9900;
483 for (ms = 1; order > 0; order--)
484 ms *= 10;
485 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486
John Rose507279d2006-06-05 16:31:48 -0500487 return ms;
488}
Michael Ellermanab3ab742006-06-23 18:20:11 +1000489EXPORT_SYMBOL(rtas_busy_delay_time);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490
John Rose507279d2006-06-05 16:31:48 -0500491/* For an RTAS busy status code, perform the hinted delay. */
492unsigned int rtas_busy_delay(int status)
493{
494 unsigned int ms;
495
496 might_sleep();
497 ms = rtas_busy_delay_time(status);
Anton Blanchardeca590f2011-04-07 01:54:07 +0000498 if (ms && need_resched())
John Rose507279d2006-06-05 16:31:48 -0500499 msleep(ms);
500
501 return ms;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502}
Michael Ellermanab3ab742006-06-23 18:20:11 +1000503EXPORT_SYMBOL(rtas_busy_delay);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504
Michael Ellerman1c21a292008-05-08 14:27:19 +1000505static int rtas_error_rc(int rtas_rc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506{
507 int rc;
508
509 switch (rtas_rc) {
510 case -1: /* Hardware Error */
511 rc = -EIO;
512 break;
513 case -3: /* Bad indicator/domain/etc */
514 rc = -EINVAL;
515 break;
516 case -9000: /* Isolation error */
517 rc = -EFAULT;
518 break;
519 case -9001: /* Outstanding TCE/PTE */
520 rc = -EEXIST;
521 break;
522 case -9002: /* No usable slot */
523 rc = -ENODEV;
524 break;
525 default:
526 printk(KERN_ERR "%s: unexpected RTAS error %d\n",
Harvey Harrisone48b1b42008-03-29 08:21:07 +1100527 __func__, rtas_rc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528 rc = -ERANGE;
529 break;
530 }
531 return rc;
532}
533
534int rtas_get_power_level(int powerdomain, int *level)
535{
536 int token = rtas_token("get-power-level");
537 int rc;
538
539 if (token == RTAS_UNKNOWN_SERVICE)
540 return -ENOENT;
541
542 while ((rc = rtas_call(token, 1, 2, level, powerdomain)) == RTAS_BUSY)
543 udelay(1);
544
545 if (rc < 0)
546 return rtas_error_rc(rc);
547 return rc;
548}
Michael Ellermanab3ab742006-06-23 18:20:11 +1000549EXPORT_SYMBOL(rtas_get_power_level);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550
551int rtas_set_power_level(int powerdomain, int level, int *setlevel)
552{
553 int token = rtas_token("set-power-level");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554 int rc;
555
556 if (token == RTAS_UNKNOWN_SERVICE)
557 return -ENOENT;
558
John Rose507279d2006-06-05 16:31:48 -0500559 do {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560 rc = rtas_call(token, 2, 2, setlevel, powerdomain, level);
John Rose507279d2006-06-05 16:31:48 -0500561 } while (rtas_busy_delay(rc));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562
563 if (rc < 0)
564 return rtas_error_rc(rc);
565 return rc;
566}
Michael Ellermanab3ab742006-06-23 18:20:11 +1000567EXPORT_SYMBOL(rtas_set_power_level);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568
569int rtas_get_sensor(int sensor, int index, int *state)
570{
571 int token = rtas_token("get-sensor-state");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572 int rc;
573
574 if (token == RTAS_UNKNOWN_SERVICE)
575 return -ENOENT;
576
John Rose507279d2006-06-05 16:31:48 -0500577 do {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578 rc = rtas_call(token, 2, 2, state, sensor, index);
John Rose507279d2006-06-05 16:31:48 -0500579 } while (rtas_busy_delay(rc));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580
581 if (rc < 0)
582 return rtas_error_rc(rc);
583 return rc;
584}
Michael Ellermanab3ab742006-06-23 18:20:11 +1000585EXPORT_SYMBOL(rtas_get_sensor);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700586
Nathan Lynchedc72ac2008-12-11 09:14:25 +0000587bool rtas_indicator_present(int token, int *maxindex)
588{
589 int proplen, count, i;
590 const struct indicator_elem {
591 u32 token;
592 u32 maxindex;
593 } *indicators;
594
595 indicators = of_get_property(rtas.dev, "rtas-indicators", &proplen);
596 if (!indicators)
597 return false;
598
599 count = proplen / sizeof(struct indicator_elem);
600
601 for (i = 0; i < count; i++) {
602 if (indicators[i].token != token)
603 continue;
604 if (maxindex)
605 *maxindex = indicators[i].maxindex;
606 return true;
607 }
608
609 return false;
610}
611EXPORT_SYMBOL(rtas_indicator_present);
612
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613int rtas_set_indicator(int indicator, int index, int new_value)
614{
615 int token = rtas_token("set-indicator");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616 int rc;
617
618 if (token == RTAS_UNKNOWN_SERVICE)
619 return -ENOENT;
620
John Rose507279d2006-06-05 16:31:48 -0500621 do {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700622 rc = rtas_call(token, 3, 1, NULL, indicator, index, new_value);
John Rose507279d2006-06-05 16:31:48 -0500623 } while (rtas_busy_delay(rc));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624
625 if (rc < 0)
626 return rtas_error_rc(rc);
627 return rc;
628}
Michael Ellermanab3ab742006-06-23 18:20:11 +1000629EXPORT_SYMBOL(rtas_set_indicator);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630
Haren Myneni81b73dd2006-07-27 14:29:00 -0700631/*
632 * Ignoring RTAS extended delay
633 */
634int rtas_set_indicator_fast(int indicator, int index, int new_value)
635{
636 int rc;
637 int token = rtas_token("set-indicator");
638
639 if (token == RTAS_UNKNOWN_SERVICE)
640 return -ENOENT;
641
642 rc = rtas_call(token, 3, 1, NULL, indicator, index, new_value);
643
644 WARN_ON(rc == -2 || (rc >= 9900 && rc <= 9905));
645
646 if (rc < 0)
647 return rtas_error_rc(rc);
648
649 return rc;
650}
651
Paul Mackerras033ef332005-10-26 17:05:24 +1000652void rtas_restart(char *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700653{
Paul Mackerrasf4fcbbe2005-11-03 14:41:19 +1100654 if (rtas_flash_term_hook)
655 rtas_flash_term_hook(SYS_RESTART);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656 printk("RTAS system-reboot returned %d\n",
657 rtas_call(rtas_token("system-reboot"), 0, 1, NULL));
658 for (;;);
659}
660
Paul Mackerras033ef332005-10-26 17:05:24 +1000661void rtas_power_off(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662{
Paul Mackerrasf4fcbbe2005-11-03 14:41:19 +1100663 if (rtas_flash_term_hook)
664 rtas_flash_term_hook(SYS_POWER_OFF);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700665 /* allow power on only with power button press */
666 printk("RTAS power-off returned %d\n",
667 rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1));
668 for (;;);
669}
670
Paul Mackerras033ef332005-10-26 17:05:24 +1000671void rtas_halt(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700672{
Paul Mackerrasf4fcbbe2005-11-03 14:41:19 +1100673 if (rtas_flash_term_hook)
674 rtas_flash_term_hook(SYS_HALT);
675 /* allow power on only with power button press */
676 printk("RTAS power-off returned %d\n",
677 rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1));
678 for (;;);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700679}
680
681/* Must be in the RMO region, so we place it here */
682static char rtas_os_term_buf[2048];
683
Paul Mackerras8f515062007-12-03 09:30:04 +1100684void rtas_os_term(char *str)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700685{
686 int status;
687
Anton Blancharde9bbc8c2010-02-18 12:11:51 +0000688 /*
689 * Firmware with the ibm,extended-os-term property is guaranteed
690 * to always return from an ibm,os-term call. Earlier versions without
691 * this property may terminate the partition which we want to avoid
692 * since it interferes with panic_timeout.
693 */
694 if (RTAS_UNKNOWN_SERVICE == rtas_token("ibm,os-term") ||
695 RTAS_UNKNOWN_SERVICE == rtas_token("ibm,extended-os-term"))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696 return;
697
Paul Mackerras8f515062007-12-03 09:30:04 +1100698 snprintf(rtas_os_term_buf, 2048, "OS panic: %s", str);
699
Linus Torvalds1da177e2005-04-16 15:20:36 -0700700 do {
701 status = rtas_call(rtas_token("ibm,os-term"), 1, 1, NULL,
702 __pa(rtas_os_term_buf));
John Rose507279d2006-06-05 16:31:48 -0500703 } while (rtas_busy_delay(status));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700704
John Rose507279d2006-06-05 16:31:48 -0500705 if (status != 0)
Anton Blancharde9bbc8c2010-02-18 12:11:51 +0000706 printk(KERN_EMERG "ibm,os-term call failed %d\n", status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707}
708
Dave C Boutcher91dc1822006-01-13 18:39:24 -0600709static int ibm_suspend_me_token = RTAS_UNKNOWN_SERVICE;
710#ifdef CONFIG_PPC_PSERIES
Brian King8fe93f82010-07-07 12:31:01 +0000711static int __rtas_suspend_last_cpu(struct rtas_suspend_me_data *data, int wake_when_done)
712{
713 u16 slb_size = mmu_slb_size;
714 int rc = H_MULTI_THREADS_ACTIVE;
715 int cpu;
716
717 slb_set_size(SLB_MIN_SIZE);
Jesse Larrew3b7a27d2010-12-01 12:31:26 +0000718 stop_topology_update();
Brian King8fe93f82010-07-07 12:31:01 +0000719 printk(KERN_DEBUG "calling ibm,suspend-me on cpu %i\n", smp_processor_id());
720
721 while (rc == H_MULTI_THREADS_ACTIVE && !atomic_read(&data->done) &&
722 !atomic_read(&data->error))
723 rc = rtas_call(data->token, 0, 1, NULL);
724
725 if (rc || atomic_read(&data->error)) {
726 printk(KERN_DEBUG "ibm,suspend-me returned %d\n", rc);
727 slb_set_size(slb_size);
728 }
729
730 if (atomic_read(&data->error))
731 rc = atomic_read(&data->error);
732
733 atomic_set(&data->error, rc);
Jesse Larrew3b7a27d2010-12-01 12:31:26 +0000734 start_topology_update();
Brian King9ee820f2011-05-04 16:01:20 +1000735 pSeries_coalesce_init();
Brian King8fe93f82010-07-07 12:31:01 +0000736
737 if (wake_when_done) {
738 atomic_set(&data->done, 1);
739
740 for_each_online_cpu(cpu)
741 plpar_hcall_norets(H_PROD, get_hard_smp_processor_id(cpu));
742 }
743
744 if (atomic_dec_return(&data->working) == 0)
745 complete(data->complete);
746
747 return rc;
748}
749
750int rtas_suspend_last_cpu(struct rtas_suspend_me_data *data)
751{
752 atomic_inc(&data->working);
753 return __rtas_suspend_last_cpu(data, 0);
754}
755
756static int __rtas_suspend_cpu(struct rtas_suspend_me_data *data, int wake_when_done)
Dave C Boutcher91dc1822006-01-13 18:39:24 -0600757{
Brian Kingf52862f2009-02-17 06:49:50 +0000758 long rc = H_SUCCESS;
Nathan Lynch8f5c7572007-11-14 03:15:13 +1100759 unsigned long msr_save;
760 int cpu;
Dave C Boutcher91dc1822006-01-13 18:39:24 -0600761
Nathan Lynch8f5c7572007-11-14 03:15:13 +1100762 atomic_inc(&data->working);
763
764 /* really need to ensure MSR.EE is off for H_JOIN */
765 msr_save = mfmsr();
766 mtmsr(msr_save & ~(MSR_EE));
767
Brian King8fe93f82010-07-07 12:31:01 +0000768 while (rc == H_SUCCESS && !atomic_read(&data->done) && !atomic_read(&data->error))
Brian Kingf52862f2009-02-17 06:49:50 +0000769 rc = plpar_hcall_norets(H_JOIN);
Nathan Lynch8f5c7572007-11-14 03:15:13 +1100770
771 mtmsr(msr_save);
772
773 if (rc == H_SUCCESS) {
774 /* This cpu was prodded and the suspend is complete. */
Dave C Boutcher91dc1822006-01-13 18:39:24 -0600775 goto out;
Nathan Lynch8f5c7572007-11-14 03:15:13 +1100776 } else if (rc == H_CONTINUE) {
777 /* All other cpus are in H_JOIN, this cpu does
778 * the suspend.
779 */
Brian King8fe93f82010-07-07 12:31:01 +0000780 return __rtas_suspend_last_cpu(data, wake_when_done);
Dave C Boutcher91dc1822006-01-13 18:39:24 -0600781 } else {
Nathan Lynch8f5c7572007-11-14 03:15:13 +1100782 printk(KERN_ERR "H_JOIN on cpu %i failed with rc = %ld\n",
783 smp_processor_id(), rc);
Brian King8fe93f82010-07-07 12:31:01 +0000784 atomic_set(&data->error, rc);
Dave C Boutcher91dc1822006-01-13 18:39:24 -0600785 }
Brian Kingf52862f2009-02-17 06:49:50 +0000786
Brian King8fe93f82010-07-07 12:31:01 +0000787 if (wake_when_done) {
788 atomic_set(&data->done, 1);
Brian Kingf52862f2009-02-17 06:49:50 +0000789
Brian King8fe93f82010-07-07 12:31:01 +0000790 /* 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.
793 */
794 for_each_online_cpu(cpu)
795 plpar_hcall_norets(H_PROD, get_hard_smp_processor_id(cpu));
796 }
Dave C Boutcher91dc1822006-01-13 18:39:24 -0600797out:
Nathan Lynch8f5c7572007-11-14 03:15:13 +1100798 if (atomic_dec_return(&data->working) == 0)
799 complete(data->complete);
Brian King8fe93f82010-07-07 12:31:01 +0000800 return rc;
801}
802
803int rtas_suspend_cpu(struct rtas_suspend_me_data *data)
804{
805 return __rtas_suspend_cpu(data, 0);
806}
807
808static void rtas_percpu_suspend_me(void *info)
809{
810 __rtas_suspend_cpu((struct rtas_suspend_me_data *)info, 1);
Dave C Boutcher91dc1822006-01-13 18:39:24 -0600811}
812
Nathan Fontenotd8862be2010-09-10 09:41:35 +0000813int rtas_ibm_suspend_me(struct rtas_args *args)
Dave C Boutcher91dc1822006-01-13 18:39:24 -0600814{
Dave C Boutcher368a6ba2006-06-12 19:49:20 -0500815 long state;
816 long rc;
Anton Blanchardb9377ff2006-07-19 08:01:28 +1000817 unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
Dave C Boutcher91dc1822006-01-13 18:39:24 -0600818 struct rtas_suspend_me_data data;
Nathan Lynch8f5c7572007-11-14 03:15:13 +1100819 DECLARE_COMPLETION_ONSTACK(done);
820
821 if (!rtas_service_present("ibm,suspend-me"))
822 return -ENOSYS;
Dave C Boutcher91dc1822006-01-13 18:39:24 -0600823
Dave C Boutcher368a6ba2006-06-12 19:49:20 -0500824 /* Make sure the state is valid */
Anton Blanchardb9377ff2006-07-19 08:01:28 +1000825 rc = plpar_hcall(H_VASI_STATE, retbuf,
826 ((u64)args->args[0] << 32) | args->args[1]);
827
828 state = retbuf[0];
Dave C Boutcher368a6ba2006-06-12 19:49:20 -0500829
830 if (rc) {
831 printk(KERN_ERR "rtas_ibm_suspend_me: vasi_state returned %ld\n",rc);
832 return rc;
833 } else if (state == H_VASI_ENABLED) {
834 args->args[args->nargs] = RTAS_NOT_SUSPENDABLE;
835 return 0;
836 } else if (state != H_VASI_SUSPENDING) {
837 printk(KERN_ERR "rtas_ibm_suspend_me: vasi_state returned state %ld\n",
838 state);
839 args->args[args->nargs] = -1;
840 return 0;
841 }
842
Nathan Lynch8f5c7572007-11-14 03:15:13 +1100843 atomic_set(&data.working, 0);
Brian Kingf52862f2009-02-17 06:49:50 +0000844 atomic_set(&data.done, 0);
Brian King8fe93f82010-07-07 12:31:01 +0000845 atomic_set(&data.error, 0);
Nathan Lynch8f5c7572007-11-14 03:15:13 +1100846 data.token = rtas_token("ibm,suspend-me");
Nathan Lynch8f5c7572007-11-14 03:15:13 +1100847 data.complete = &done;
Dave C Boutcher91dc1822006-01-13 18:39:24 -0600848
849 /* Call function on all CPUs. One of us will make the
850 * rtas call
851 */
Jens Axboe15c8b6c2008-05-09 09:39:44 +0200852 if (on_each_cpu(rtas_percpu_suspend_me, &data, 0))
Brian King8fe93f82010-07-07 12:31:01 +0000853 atomic_set(&data.error, -EINVAL);
Dave C Boutcher91dc1822006-01-13 18:39:24 -0600854
Nathan Lynch8f5c7572007-11-14 03:15:13 +1100855 wait_for_completion(&done);
856
Brian King8fe93f82010-07-07 12:31:01 +0000857 if (atomic_read(&data.error) != 0)
Dave C Boutcher91dc1822006-01-13 18:39:24 -0600858 printk(KERN_ERR "Error doing global join\n");
859
Brian King8fe93f82010-07-07 12:31:01 +0000860 return atomic_read(&data.error);
Dave C Boutcher91dc1822006-01-13 18:39:24 -0600861}
862#else /* CONFIG_PPC_PSERIES */
Nathan Fontenotd8862be2010-09-10 09:41:35 +0000863int rtas_ibm_suspend_me(struct rtas_args *args)
Dave C Boutcher91dc1822006-01-13 18:39:24 -0600864{
865 return -ENOSYS;
866}
867#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700868
869asmlinkage int ppc_rtas(struct rtas_args __user *uargs)
870{
871 struct rtas_args args;
872 unsigned long flags;
Paul Mackerras033ef332005-10-26 17:05:24 +1000873 char *buff_copy, *errbuf = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700874 int nargs;
Dave C Boutcher91dc1822006-01-13 18:39:24 -0600875 int rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700876
877 if (!capable(CAP_SYS_ADMIN))
878 return -EPERM;
879
880 if (copy_from_user(&args, uargs, 3 * sizeof(u32)) != 0)
881 return -EFAULT;
882
883 nargs = args.nargs;
884 if (nargs > ARRAY_SIZE(args.args)
885 || args.nret > ARRAY_SIZE(args.args)
886 || nargs + args.nret > ARRAY_SIZE(args.args))
887 return -EINVAL;
888
889 /* Copy in args. */
890 if (copy_from_user(args.args, uargs->args,
891 nargs * sizeof(rtas_arg_t)) != 0)
892 return -EFAULT;
893
Dave C Boutcher91dc1822006-01-13 18:39:24 -0600894 if (args.token == RTAS_UNKNOWN_SERVICE)
895 return -EINVAL;
896
Nathan Fontenotb79998f2008-07-31 02:23:27 +1000897 args.rets = &args.args[nargs];
898 memset(args.rets, 0, args.nret * sizeof(rtas_arg_t));
899
Dave C Boutcher91dc1822006-01-13 18:39:24 -0600900 /* Need to handle ibm,suspend_me call specially */
901 if (args.token == ibm_suspend_me_token) {
902 rc = rtas_ibm_suspend_me(&args);
903 if (rc)
904 return rc;
905 goto copy_return;
906 }
907
Paul Mackerras033ef332005-10-26 17:05:24 +1000908 buff_copy = get_errorlog_buffer();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700909
Benjamin Herrenschmidtf97bb362009-06-16 16:42:49 +0000910 flags = lock_rtas();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700911
912 rtas.args = args;
913 enter_rtas(__pa(&rtas.args));
914 args = rtas.args;
915
Linus Torvalds1da177e2005-04-16 15:20:36 -0700916 /* A -1 return code indicates that the last command couldn't
917 be completed due to a hardware error. */
Paul Mackerras033ef332005-10-26 17:05:24 +1000918 if (args.rets[0] == -1)
919 errbuf = __fetch_rtas_last_error(buff_copy);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700920
Benjamin Herrenschmidtf97bb362009-06-16 16:42:49 +0000921 unlock_rtas(flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700922
923 if (buff_copy) {
Paul Mackerras033ef332005-10-26 17:05:24 +1000924 if (errbuf)
925 log_error(errbuf, ERR_TYPE_RTAS_LOG, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700926 kfree(buff_copy);
927 }
928
Dave C Boutcher91dc1822006-01-13 18:39:24 -0600929 copy_return:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700930 /* Copy out args. */
931 if (copy_to_user(uargs->args + nargs,
932 args.args + nargs,
933 args.nret * sizeof(rtas_arg_t)) != 0)
934 return -EFAULT;
935
936 return 0;
937}
938
Linus Torvalds1da177e2005-04-16 15:20:36 -0700939/*
Adrian Bunk943ffb52006-01-10 00:10:13 +0100940 * Call early during boot, before mem init or bootmem, to retrieve the RTAS
Linus Torvalds1da177e2005-04-16 15:20:36 -0700941 * informations from the device-tree and allocate the RMO buffer for userland
942 * accesses.
943 */
944void __init rtas_initialize(void)
945{
Paul Mackerras033ef332005-10-26 17:05:24 +1000946 unsigned long rtas_region = RTAS_INSTANTIATE_MAX;
947
Linus Torvalds1da177e2005-04-16 15:20:36 -0700948 /* Get RTAS dev node and fill up our "rtas" structure with infos
949 * about it.
950 */
951 rtas.dev = of_find_node_by_name(NULL, "rtas");
952 if (rtas.dev) {
Jeremy Kerra7f67bd2006-07-12 15:35:54 +1000953 const u32 *basep, *entryp, *sizep;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700954
Stephen Rothwelle2eb6392007-04-03 22:26:41 +1000955 basep = of_get_property(rtas.dev, "linux,rtas-base", NULL);
956 sizep = of_get_property(rtas.dev, "rtas-size", NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700957 if (basep != NULL && sizep != NULL) {
958 rtas.base = *basep;
959 rtas.size = *sizep;
Stephen Rothwelle2eb6392007-04-03 22:26:41 +1000960 entryp = of_get_property(rtas.dev,
Jeremy Kerra7f67bd2006-07-12 15:35:54 +1000961 "linux,rtas-entry", NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700962 if (entryp == NULL) /* Ugh */
963 rtas.entry = rtas.base;
964 else
965 rtas.entry = *entryp;
966 } else
967 rtas.dev = NULL;
968 }
Paul Mackerras033ef332005-10-26 17:05:24 +1000969 if (!rtas.dev)
970 return;
971
Linus Torvalds1da177e2005-04-16 15:20:36 -0700972 /* If RTAS was found, allocate the RMO buffer for it and look for
973 * the stop-self token if any
974 */
Paul Mackerras033ef332005-10-26 17:05:24 +1000975#ifdef CONFIG_PPC64
Benjamin Herrenschmidte8222502006-03-28 23:15:54 +1100976 if (machine_is(pseries) && firmware_has_feature(FW_FEATURE_LPAR)) {
Benjamin Herrenschmidtcd3db0c2010-07-06 15:39:02 -0700977 rtas_region = min(ppc64_rma_size, RTAS_INSTANTIATE_MAX);
Dave C Boutcher91dc1822006-01-13 18:39:24 -0600978 ibm_suspend_me_token = rtas_token("ibm,suspend-me");
979 }
Paul Mackerras033ef332005-10-26 17:05:24 +1000980#endif
Yinghai Lu95f72d12010-07-12 14:36:09 +1000981 rtas_rmo_buf = memblock_alloc_base(RTAS_RMOBUF_MAX, PAGE_SIZE, rtas_region);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700982
Paul Mackerras033ef332005-10-26 17:05:24 +1000983#ifdef CONFIG_RTAS_ERROR_LOGGING
984 rtas_last_error_token = rtas_token("rtas-last-error");
985#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700986}
Michael Ellerman458148c2006-06-23 18:20:13 +1000987
988int __init early_init_dt_scan_rtas(unsigned long node,
989 const char *uname, int depth, void *data)
990{
991 u32 *basep, *entryp, *sizep;
992
993 if (depth != 1 || strcmp(uname, "rtas") != 0)
994 return 0;
995
996 basep = of_get_flat_dt_prop(node, "linux,rtas-base", NULL);
997 entryp = of_get_flat_dt_prop(node, "linux,rtas-entry", NULL);
998 sizep = of_get_flat_dt_prop(node, "rtas-size", NULL);
999
1000 if (basep && entryp && sizep) {
1001 rtas.base = *basep;
1002 rtas.entry = *entryp;
1003 rtas.size = *sizep;
1004 }
1005
Michael Ellermancc46bb92006-06-23 18:20:16 +10001006#ifdef CONFIG_UDBG_RTAS_CONSOLE
1007 basep = of_get_flat_dt_prop(node, "put-term-char", NULL);
1008 if (basep)
1009 rtas_putchar_token = *basep;
1010
1011 basep = of_get_flat_dt_prop(node, "get-term-char", NULL);
1012 if (basep)
1013 rtas_getchar_token = *basep;
Michael Neuling9a2ded52006-08-16 23:12:14 -05001014
1015 if (rtas_putchar_token != RTAS_UNKNOWN_SERVICE &&
1016 rtas_getchar_token != RTAS_UNKNOWN_SERVICE)
1017 udbg_init_rtas_console();
1018
Michael Ellermancc46bb92006-06-23 18:20:16 +10001019#endif
1020
Michael Ellerman458148c2006-06-23 18:20:13 +10001021 /* break now */
1022 return 1;
1023}
Benjamin Herrenschmidtc4007a22009-06-16 16:42:50 +00001024
Thomas Gleixner445c8952009-12-02 19:49:50 +01001025static arch_spinlock_t timebase_lock;
Benjamin Herrenschmidtc4007a22009-06-16 16:42:50 +00001026static u64 timebase = 0;
1027
1028void __cpuinit rtas_give_timebase(void)
1029{
1030 unsigned long flags;
1031
1032 local_irq_save(flags);
1033 hard_irq_disable();
Thomas Gleixner0199c4e2009-12-02 20:01:25 +01001034 arch_spin_lock(&timebase_lock);
Benjamin Herrenschmidtc4007a22009-06-16 16:42:50 +00001035 rtas_call(rtas_token("freeze-time-base"), 0, 1, NULL);
1036 timebase = get_tb();
Thomas Gleixner0199c4e2009-12-02 20:01:25 +01001037 arch_spin_unlock(&timebase_lock);
Benjamin Herrenschmidtc4007a22009-06-16 16:42:50 +00001038
1039 while (timebase)
1040 barrier();
1041 rtas_call(rtas_token("thaw-time-base"), 0, 1, NULL);
1042 local_irq_restore(flags);
1043}
1044
1045void __cpuinit rtas_take_timebase(void)
1046{
1047 while (!timebase)
1048 barrier();
Thomas Gleixner0199c4e2009-12-02 20:01:25 +01001049 arch_spin_lock(&timebase_lock);
Benjamin Herrenschmidtc4007a22009-06-16 16:42:50 +00001050 set_tb(timebase >> 32, timebase & 0xffffffff);
1051 timebase = 0;
Thomas Gleixner0199c4e2009-12-02 20:01:25 +01001052 arch_spin_unlock(&timebase_lock);
Benjamin Herrenschmidtc4007a22009-06-16 16:42:50 +00001053}