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>
23 #include <asm/semaphore.h>
24 #include <asm/machdep.h>
27 #include <asm/param.h>
28 #include <asm/system.h>
29 #include <asm/abs_addr.h>
31 #include <asm/delay.h>
32 #include <asm/uaccess.h>
34 struct flash_block_list_header rtas_firmware_flash_list = {0, NULL};
36 struct rtas_t rtas = {
37 .lock = SPIN_LOCK_UNLOCKED
40 EXPORT_SYMBOL_GPL(rtas);
42 char rtas_err_buf[RTAS_ERROR_LOG_MAX];
44 spinlock_t rtas_data_buf_lock = SPIN_LOCK_UNLOCKED;
45 char rtas_data_buf[RTAS_DATA_BUF_SIZE]__page_aligned;
48 call_rtas_display_status(char c)
50 struct rtas_args *args = &rtas.args;
53 spin_lock_irqsave(&rtas.lock, s);
58 args->rets = (rtas_arg_t *)&(args->args[1]);
59 args->args[0] = (int)c;
61 enter_rtas(__pa(args));
63 spin_unlock_irqrestore(&rtas.lock, s);
67 rtas_token(const char *service)
70 if (rtas.dev == NULL) {
71 PPCDBG(PPCDBG_RTAS,"\tNo rtas device in device-tree...\n");
72 return RTAS_UNKNOWN_SERVICE;
74 tokp = (int *) get_property(rtas.dev, service, NULL);
75 return tokp ? *tokp : RTAS_UNKNOWN_SERVICE;
79 /** Return a copy of the detailed error text associated with the
80 * most recent failed call to rtas. Because the error text
81 * might go stale if there are any other intervening rtas calls,
82 * this routine must be called atomically with whatever produced
83 * the error (i.e. with rtas.lock still held from the previous call).
86 __fetch_rtas_last_error(void)
88 struct rtas_args err_args, save_args;
90 err_args.token = rtas_token("rtas-last-error");
93 err_args.rets = (rtas_arg_t *)&(err_args.args[2]);
95 err_args.args[0] = (rtas_arg_t)__pa(rtas_err_buf);
96 err_args.args[1] = RTAS_ERROR_LOG_MAX;
99 save_args = rtas.args;
100 rtas.args = err_args;
102 PPCDBG(PPCDBG_RTAS, "\tentering rtas with 0x%lx\n",
104 enter_rtas(__pa(&rtas.args));
105 PPCDBG(PPCDBG_RTAS, "\treturned from rtas ...\n");
107 err_args = rtas.args;
108 rtas.args = save_args;
110 return err_args.rets[0];
113 int rtas_call(int token, int nargs, int nret, int *outputs, ...)
118 struct rtas_args *rtas_args;
119 char * buff_copy = NULL;
122 PPCDBG(PPCDBG_RTAS, "Entering rtas_call\n");
123 PPCDBG(PPCDBG_RTAS, "\ttoken = 0x%x\n", token);
124 PPCDBG(PPCDBG_RTAS, "\tnargs = %d\n", nargs);
125 PPCDBG(PPCDBG_RTAS, "\tnret = %d\n", nret);
126 PPCDBG(PPCDBG_RTAS, "\t&outputs = 0x%lx\n", outputs);
127 if (token == RTAS_UNKNOWN_SERVICE)
130 /* Gotta do something different here, use global lock for now... */
131 spin_lock_irqsave(&rtas.lock, s);
132 rtas_args = &rtas.args;
134 rtas_args->token = token;
135 rtas_args->nargs = nargs;
136 rtas_args->nret = nret;
137 rtas_args->rets = (rtas_arg_t *)&(rtas_args->args[nargs]);
138 va_start(list, outputs);
139 for (i = 0; i < nargs; ++i) {
140 rtas_args->args[i] = va_arg(list, rtas_arg_t);
141 PPCDBG(PPCDBG_RTAS, "\tnarg[%d] = 0x%x\n", i, rtas_args->args[i]);
145 for (i = 0; i < nret; ++i)
146 rtas_args->rets[i] = 0;
148 PPCDBG(PPCDBG_RTAS, "\tentering rtas with 0x%lx\n",
150 enter_rtas(__pa(rtas_args));
151 PPCDBG(PPCDBG_RTAS, "\treturned from rtas ...\n");
153 /* A -1 return code indicates that the last command couldn't
154 be completed due to a hardware error. */
155 if (rtas_args->rets[0] == -1)
156 logit = (__fetch_rtas_last_error() == 0);
158 ifppcdebug(PPCDBG_RTAS) {
159 for(i=0; i < nret ;i++)
160 udbg_printf("\tnret[%d] = 0x%lx\n", i, (ulong)rtas_args->rets[i]);
163 if (nret > 1 && outputs != NULL)
164 for (i = 0; i < nret-1; ++i)
165 outputs[i] = rtas_args->rets[i+1];
166 ret = (nret > 0)? rtas_args->rets[0]: 0;
168 /* Log the error in the unlikely case that there was one. */
169 if (unlikely(logit)) {
170 buff_copy = kmalloc(RTAS_ERROR_LOG_MAX, GFP_ATOMIC);
172 memcpy(buff_copy, rtas_err_buf, RTAS_ERROR_LOG_MAX);
176 /* Gotta do something different here, use global lock for now... */
177 spin_unlock_irqrestore(&rtas.lock, s);
180 log_error(buff_copy, ERR_TYPE_RTAS_LOG, 0);
186 /* Given an RTAS status code of 990n compute the hinted delay of 10^n
187 * (last digit) milliseconds. For now we bound at n=5 (100 sec).
190 rtas_extended_busy_delay_time(int status)
192 int order = status - 9900;
196 order = 0; /* RTC depends on this for -2 clock busy */
198 order = 5; /* bound */
200 /* Use microseconds for reasonable accuracy */
201 for (ms=1; order > 0; order--)
208 rtas_get_power_level(int powerdomain, int *level)
210 int token = rtas_token("get-power-level");
213 if (token == RTAS_UNKNOWN_SERVICE)
214 return RTAS_UNKNOWN_OP;
216 while ((rc = rtas_call(token, 1, 2, level, powerdomain)) == RTAS_BUSY)
222 rtas_set_power_level(int powerdomain, int level, int *setlevel)
224 int token = rtas_token("set-power-level");
225 unsigned int wait_time;
228 if (token == RTAS_UNKNOWN_SERVICE)
229 return RTAS_UNKNOWN_OP;
232 rc = rtas_call(token, 2, 2, setlevel, powerdomain, level);
235 else if (rtas_is_extended_busy(rc)) {
236 wait_time = rtas_extended_busy_delay_time(rc);
237 udelay(wait_time * 1000);
245 rtas_get_sensor(int sensor, int index, int *state)
247 int token = rtas_token("get-sensor-state");
248 unsigned int wait_time;
251 if (token == RTAS_UNKNOWN_SERVICE)
252 return RTAS_UNKNOWN_OP;
255 rc = rtas_call(token, 2, 2, state, sensor, index);
258 else if (rtas_is_extended_busy(rc)) {
259 wait_time = rtas_extended_busy_delay_time(rc);
260 udelay(wait_time * 1000);
268 rtas_set_indicator(int indicator, int index, int new_value)
270 int token = rtas_token("set-indicator");
271 unsigned int wait_time;
274 if (token == RTAS_UNKNOWN_SERVICE)
275 return RTAS_UNKNOWN_OP;
278 rc = rtas_call(token, 3, 1, NULL, indicator, index, new_value);
281 else if (rtas_is_extended_busy(rc)) {
282 wait_time = rtas_extended_busy_delay_time(rc);
283 udelay(wait_time * 1000);
292 #define FLASH_BLOCK_LIST_VERSION (1UL)
294 rtas_flash_firmware(void)
296 unsigned long image_size;
297 struct flash_block_list *f, *next, *flist;
298 unsigned long rtas_block_list;
299 int i, status, update_token;
301 update_token = rtas_token("ibm,update-flash-64-and-reboot");
302 if (update_token == RTAS_UNKNOWN_SERVICE) {
303 printk(KERN_ALERT "FLASH: ibm,update-flash-64-and-reboot is not available -- not a service partition?\n");
304 printk(KERN_ALERT "FLASH: firmware will not be flashed\n");
308 /* NOTE: the "first" block list is a global var with no data
309 * blocks in the kernel data segment. We do this because
310 * we want to ensure this block_list addr is under 4GB.
312 rtas_firmware_flash_list.num_blocks = 0;
313 flist = (struct flash_block_list *)&rtas_firmware_flash_list;
314 rtas_block_list = virt_to_abs(flist);
315 if (rtas_block_list >= 4UL*1024*1024*1024) {
316 printk(KERN_ALERT "FLASH: kernel bug...flash list header addr above 4GB\n");
320 printk(KERN_ALERT "FLASH: preparing saved firmware image for flash\n");
321 /* Update the block_list in place. */
323 for (f = flist; f; f = next) {
324 /* Translate data addrs to absolute */
325 for (i = 0; i < f->num_blocks; i++) {
326 f->blocks[i].data = (char *)virt_to_abs(f->blocks[i].data);
327 image_size += f->blocks[i].length;
330 /* Don't translate NULL pointer for last entry */
332 f->next = (struct flash_block_list *)virt_to_abs(f->next);
335 /* make num_blocks into the version/length field */
336 f->num_blocks = (FLASH_BLOCK_LIST_VERSION << 56) | ((f->num_blocks+1)*16);
339 printk(KERN_ALERT "FLASH: flash image is %ld bytes\n", image_size);
340 printk(KERN_ALERT "FLASH: performing flash and reboot\n");
341 ppc_md.progress("Flashing \n", 0x0);
342 ppc_md.progress("Please Wait... ", 0x0);
343 printk(KERN_ALERT "FLASH: this will take several minutes. Do not power off!\n");
344 status = rtas_call(update_token, 1, 1, NULL, rtas_block_list);
345 switch (status) { /* should only get "bad" status */
347 printk(KERN_ALERT "FLASH: success\n");
350 printk(KERN_ALERT "FLASH: hardware error. Firmware may not be not flashed\n");
353 printk(KERN_ALERT "FLASH: image is corrupt or not correct for this platform. Firmware not flashed\n");
356 printk(KERN_ALERT "FLASH: flash failed when partially complete. System may not reboot\n");
359 printk(KERN_ALERT "FLASH: unknown flash return code %d\n", status);
364 void rtas_flash_bypass_warning(void)
366 printk(KERN_ALERT "FLASH: firmware flash requires a reboot\n");
367 printk(KERN_ALERT "FLASH: the firmware image will NOT be flashed\n");
372 rtas_restart(char *cmd)
374 if (rtas_firmware_flash_list.next)
375 rtas_flash_firmware();
377 printk("RTAS system-reboot returned %d\n",
378 rtas_call(rtas_token("system-reboot"), 0, 1, NULL));
385 if (rtas_firmware_flash_list.next)
386 rtas_flash_bypass_warning();
387 /* allow power on only with power button press */
388 printk("RTAS power-off returned %d\n",
389 rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1));
396 if (rtas_firmware_flash_list.next)
397 rtas_flash_bypass_warning();
401 /* Must be in the RMO region, so we place it here */
402 static char rtas_os_term_buf[2048];
404 void rtas_os_term(char *str)
408 snprintf(rtas_os_term_buf, 2048, "OS panic: %s", str);
411 status = rtas_call(rtas_token("ibm,os-term"), 1, 1, NULL,
412 __pa(rtas_os_term_buf));
414 if (status == RTAS_BUSY)
416 else if (status != 0)
417 printk(KERN_EMERG "ibm,os-term call failed %d\n",
419 } while (status == RTAS_BUSY);
422 unsigned long rtas_rmo_buf = 0;
424 asmlinkage int ppc_rtas(struct rtas_args __user *uargs)
426 struct rtas_args args;
432 if (!capable(CAP_SYS_ADMIN))
435 if (copy_from_user(&args, uargs, 3 * sizeof(u32)) != 0)
439 if (nargs > ARRAY_SIZE(args.args)
440 || args.nret > ARRAY_SIZE(args.args)
441 || nargs + args.nret > ARRAY_SIZE(args.args))
445 if (copy_from_user(args.args, uargs->args,
446 nargs * sizeof(rtas_arg_t)) != 0)
449 buff_copy = kmalloc(RTAS_ERROR_LOG_MAX, GFP_KERNEL);
451 spin_lock_irqsave(&rtas.lock, flags);
454 enter_rtas(__pa(&rtas.args));
457 args.rets = &args.args[nargs];
459 /* A -1 return code indicates that the last command couldn't
460 be completed due to a hardware error. */
461 if (args.rets[0] == -1) {
462 err_rc = __fetch_rtas_last_error();
463 if ((err_rc == 0) && buff_copy) {
464 memcpy(buff_copy, rtas_err_buf, RTAS_ERROR_LOG_MAX);
468 spin_unlock_irqrestore(&rtas.lock, flags);
471 if ((args.rets[0] == -1) && (err_rc == 0)) {
472 log_error(buff_copy, ERR_TYPE_RTAS_LOG, 0);
478 if (copy_to_user(uargs->args + nargs,
480 args.nret * sizeof(rtas_arg_t)) != 0)
486 #ifdef CONFIG_HOTPLUG_CPU
487 /* This version can't take the spinlock, because it never returns */
489 struct rtas_args rtas_stop_self_args = {
490 /* The token is initialized for real in setup_system() */
491 .token = RTAS_UNKNOWN_SERVICE,
494 .rets = &rtas_stop_self_args.args[0],
497 void rtas_stop_self(void)
499 struct rtas_args *rtas_args = &rtas_stop_self_args;
503 BUG_ON(rtas_args->token == RTAS_UNKNOWN_SERVICE);
505 printk("cpu %u (hwid %u) Ready to die...\n",
506 smp_processor_id(), hard_smp_processor_id());
507 enter_rtas(__pa(rtas_args));
509 panic("Alas, I survived.\n");
511 #endif /* CONFIG_HOTPLUG_CPU */
513 EXPORT_SYMBOL(rtas_firmware_flash_list);
514 EXPORT_SYMBOL(rtas_token);
515 EXPORT_SYMBOL(rtas_call);
516 EXPORT_SYMBOL(rtas_data_buf);
517 EXPORT_SYMBOL(rtas_data_buf_lock);
518 EXPORT_SYMBOL(rtas_extended_busy_delay_time);
519 EXPORT_SYMBOL(rtas_get_sensor);
520 EXPORT_SYMBOL(rtas_get_power_level);
521 EXPORT_SYMBOL(rtas_set_power_level);
522 EXPORT_SYMBOL(rtas_set_indicator);