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, 0};
37 * prom_init() is called very early on, before the kernel text
38 * and data have been mapped to KERNELBASE. At this point the code
39 * is running at whatever address it has been loaded at, so
40 * references to extern and static variables must be relocated
41 * explicitly. The procedure reloc_offset() returns the address
42 * we're currently running at minus the address we were linked at.
43 * (Note that strings count as static variables.)
45 * Because OF may have mapped I/O devices into the area starting at
46 * KERNELBASE, particularly on CHRP machines, we can't safely call
47 * OF once the kernel has been mapped to KERNELBASE. Therefore all
48 * OF calls should be done within prom_init(), and prom_init()
49 * and all routines called within it must be careful to relocate
50 * references as necessary.
52 * Note that the bss is cleared *after* prom_init runs, so we have
53 * to make sure that any static or extern variables it accesses
54 * are put in the data segment.
57 struct rtas_t rtas = {
58 .lock = SPIN_LOCK_UNLOCKED
61 EXPORT_SYMBOL_GPL(rtas);
63 char rtas_err_buf[RTAS_ERROR_LOG_MAX];
65 extern unsigned long reloc_offset(void);
67 spinlock_t rtas_data_buf_lock = SPIN_LOCK_UNLOCKED;
68 char rtas_data_buf[RTAS_DATA_BUF_SIZE]__page_aligned;
71 call_rtas_display_status(char c)
73 struct rtas_args *args = &(get_paca()->xRtas);
76 spin_lock_irqsave(&rtas.lock, s);
81 args->rets = (rtas_arg_t *)&(args->args[1]);
82 args->args[0] = (int)c;
84 enter_rtas(__pa(args));
86 spin_unlock_irqrestore(&rtas.lock, s);
90 rtas_token(const char *service)
93 if (rtas.dev == NULL) {
94 PPCDBG(PPCDBG_RTAS,"\tNo rtas device in device-tree...\n");
95 return RTAS_UNKNOWN_SERVICE;
97 tokp = (int *) get_property(rtas.dev, service, NULL);
98 return tokp ? *tokp : RTAS_UNKNOWN_SERVICE;
103 __log_rtas_error(struct rtas_args *rtas_args)
105 struct rtas_args err_args, temp_args;
107 err_args.token = rtas_token("rtas-last-error");
110 err_args.rets = (rtas_arg_t *)&(err_args.args[2]);
112 err_args.args[0] = (rtas_arg_t)__pa(rtas_err_buf);
113 err_args.args[1] = RTAS_ERROR_LOG_MAX;
114 err_args.args[2] = 0;
116 temp_args = *rtas_args;
117 get_paca()->xRtas = err_args;
119 PPCDBG(PPCDBG_RTAS, "\tentering rtas with 0x%lx\n",
121 enter_rtas(__pa(&get_paca()->xRtas));
122 PPCDBG(PPCDBG_RTAS, "\treturned from rtas ...\n");
124 err_args = get_paca()->xRtas;
125 get_paca()->xRtas = temp_args;
127 return err_args.rets[0];
131 log_rtas_error(struct rtas_args *rtas_args)
136 spin_lock_irqsave(&rtas.lock, s);
137 rc = __log_rtas_error(rtas_args);
138 spin_unlock_irqrestore(&rtas.lock, s);
140 log_error(rtas_err_buf, ERR_TYPE_RTAS_LOG, 0);
144 rtas_call(int token, int nargs, int nret,
145 unsigned long *outputs, ...)
150 struct rtas_args *rtas_args = &(get_paca()->xRtas);
153 PPCDBG(PPCDBG_RTAS, "Entering rtas_call\n");
154 PPCDBG(PPCDBG_RTAS, "\ttoken = 0x%x\n", token);
155 PPCDBG(PPCDBG_RTAS, "\tnargs = %d\n", nargs);
156 PPCDBG(PPCDBG_RTAS, "\tnret = %d\n", nret);
157 PPCDBG(PPCDBG_RTAS, "\t&outputs = 0x%lx\n", outputs);
158 if (token == RTAS_UNKNOWN_SERVICE)
161 /* Gotta do something different here, use global lock for now... */
162 spin_lock_irqsave(&rtas.lock, s);
164 rtas_args->token = token;
165 rtas_args->nargs = nargs;
166 rtas_args->nret = nret;
167 rtas_args->rets = (rtas_arg_t *)&(rtas_args->args[nargs]);
168 va_start(list, outputs);
169 for (i = 0; i < nargs; ++i) {
170 rtas_args->args[i] = (rtas_arg_t)LONG_LSW(va_arg(list, ulong));
171 PPCDBG(PPCDBG_RTAS, "\tnarg[%d] = 0x%lx\n", i, rtas_args->args[i]);
175 for (i = 0; i < nret; ++i)
176 rtas_args->rets[i] = 0;
178 PPCDBG(PPCDBG_RTAS, "\tentering rtas with 0x%lx\n",
180 enter_rtas(__pa(rtas_args));
181 PPCDBG(PPCDBG_RTAS, "\treturned from rtas ...\n");
183 if (rtas_args->rets[0] == -1)
184 logit = (__log_rtas_error(rtas_args) == 0);
186 ifppcdebug(PPCDBG_RTAS) {
187 for(i=0; i < nret ;i++)
188 udbg_printf("\tnret[%d] = 0x%lx\n", i, (ulong)rtas_args->rets[i]);
191 if (nret > 1 && outputs != NULL)
192 for (i = 0; i < nret-1; ++i)
193 outputs[i] = rtas_args->rets[i+1];
194 ret = (ulong)((nret > 0) ? rtas_args->rets[0] : 0);
196 /* Gotta do something different here, use global lock for now... */
197 spin_unlock_irqrestore(&rtas.lock, s);
200 log_error(rtas_err_buf, ERR_TYPE_RTAS_LOG, 0);
205 /* Given an RTAS status code of 990n compute the hinted delay of 10^n
206 * (last digit) milliseconds. For now we bound at n=5 (100 sec).
209 rtas_extended_busy_delay_time(int status)
211 int order = status - 9900;
215 order = 0; /* RTC depends on this for -2 clock busy */
217 order = 5; /* bound */
219 /* Use microseconds for reasonable accuracy */
220 for (ms=1; order > 0; order--)
227 rtas_get_power_level(int powerdomain, int *level)
229 int token = rtas_token("get-power-level");
233 if (token == RTAS_UNKNOWN_SERVICE)
234 return RTAS_UNKNOWN_OP;
237 rc = (int) rtas_call(token, 1, 2, &powerlevel, powerdomain);
243 *level = (int) powerlevel;
248 rtas_set_power_level(int powerdomain, int level, int *setlevel)
250 int token = rtas_token("set-power-level");
251 unsigned int wait_time;
255 if (token == RTAS_UNKNOWN_SERVICE)
256 return RTAS_UNKNOWN_OP;
259 rc = (int) rtas_call(token, 2, 2, &returned_level, powerdomain,
263 else if (rtas_is_extended_busy(rc)) {
264 wait_time = rtas_extended_busy_delay_time(rc);
265 udelay(wait_time * 1000);
270 *setlevel = (int) returned_level;
275 rtas_get_sensor(int sensor, int index, int *state)
277 int token = rtas_token("get-sensor-state");
278 unsigned int wait_time;
282 if (token == RTAS_UNKNOWN_SERVICE)
283 return RTAS_UNKNOWN_OP;
286 rc = (int) rtas_call(token, 2, 2, &returned_state, sensor,
290 else if (rtas_is_extended_busy(rc)) {
291 wait_time = rtas_extended_busy_delay_time(rc);
292 udelay(wait_time * 1000);
297 *state = (int) returned_state;
302 rtas_set_indicator(int indicator, int index, int new_value)
304 int token = rtas_token("set-indicator");
305 unsigned int wait_time;
308 if (token == RTAS_UNKNOWN_SERVICE)
309 return RTAS_UNKNOWN_OP;
312 rc = (int) rtas_call(token, 3, 1, NULL, indicator, index,
316 else if (rtas_is_extended_busy(rc)) {
317 wait_time = rtas_extended_busy_delay_time(rc);
318 udelay(wait_time * 1000);
327 #define FLASH_BLOCK_LIST_VERSION (1UL)
329 rtas_flash_firmware(void)
331 unsigned long image_size;
332 struct flash_block_list *f, *next, *flist;
333 unsigned long rtas_block_list;
334 int i, status, update_token;
336 update_token = rtas_token("ibm,update-flash-64-and-reboot");
337 if (update_token == RTAS_UNKNOWN_SERVICE) {
338 printk(KERN_ALERT "FLASH: ibm,update-flash-64-and-reboot is not available -- not a service partition?\n");
339 printk(KERN_ALERT "FLASH: firmware will not be flashed\n");
343 /* NOTE: the "first" block list is a global var with no data
344 * blocks in the kernel data segment. We do this because
345 * we want to ensure this block_list addr is under 4GB.
347 rtas_firmware_flash_list.num_blocks = 0;
348 flist = (struct flash_block_list *)&rtas_firmware_flash_list;
349 rtas_block_list = virt_to_abs(flist);
350 if (rtas_block_list >= 4UL*1024*1024*1024) {
351 printk(KERN_ALERT "FLASH: kernel bug...flash list header addr above 4GB\n");
355 printk(KERN_ALERT "FLASH: preparing saved firmware image for flash\n");
356 /* Update the block_list in place. */
358 for (f = flist; f; f = next) {
359 /* Translate data addrs to absolute */
360 for (i = 0; i < f->num_blocks; i++) {
361 f->blocks[i].data = (char *)virt_to_abs(f->blocks[i].data);
362 image_size += f->blocks[i].length;
365 /* Don't translate NULL pointer for last entry */
367 f->next = (struct flash_block_list *)virt_to_abs(f->next);
370 /* make num_blocks into the version/length field */
371 f->num_blocks = (FLASH_BLOCK_LIST_VERSION << 56) | ((f->num_blocks+1)*16);
374 printk(KERN_ALERT "FLASH: flash image is %ld bytes\n", image_size);
375 printk(KERN_ALERT "FLASH: performing flash and reboot\n");
376 ppc_md.progress("Flashing \n", 0x0);
377 ppc_md.progress("Please Wait... ", 0x0);
378 printk(KERN_ALERT "FLASH: this will take several minutes. Do not power off!\n");
379 status = rtas_call(update_token, 1, 1, NULL, rtas_block_list);
380 switch (status) { /* should only get "bad" status */
382 printk(KERN_ALERT "FLASH: success\n");
385 printk(KERN_ALERT "FLASH: hardware error. Firmware may not be not flashed\n");
388 printk(KERN_ALERT "FLASH: image is corrupt or not correct for this platform. Firmware not flashed\n");
391 printk(KERN_ALERT "FLASH: flash failed when partially complete. System may not reboot\n");
394 printk(KERN_ALERT "FLASH: unknown flash return code %d\n", status);
399 void rtas_flash_bypass_warning(void)
401 printk(KERN_ALERT "FLASH: firmware flash requires a reboot\n");
402 printk(KERN_ALERT "FLASH: the firmware image will NOT be flashed\n");
407 rtas_restart(char *cmd)
409 if (rtas_firmware_flash_list.next)
410 rtas_flash_firmware();
412 printk("RTAS system-reboot returned %ld\n",
413 rtas_call(rtas_token("system-reboot"), 0, 1, NULL));
420 if (rtas_firmware_flash_list.next)
421 rtas_flash_bypass_warning();
422 /* allow power on only with power button press */
423 printk("RTAS power-off returned %ld\n",
424 rtas_call(rtas_token("power-off"), 2, 1, NULL,0xffffffff,0xffffffff));
431 if (rtas_firmware_flash_list.next)
432 rtas_flash_bypass_warning();
436 /* Must be in the RMO region, so we place it here */
437 static char rtas_os_term_buf[2048];
439 void rtas_os_term(char *str)
443 snprintf(rtas_os_term_buf, 2048, "OS panic: %s", str);
446 status = rtas_call(rtas_token("ibm,os-term"), 1, 1, NULL,
447 __pa(rtas_os_term_buf));
449 if (status == RTAS_BUSY)
451 else if (status != 0)
452 printk(KERN_EMERG "ibm,os-term call failed %ld\n",
454 } while (status == RTAS_BUSY);
457 unsigned long rtas_rmo_buf = 0;
459 asmlinkage int ppc_rtas(struct rtas_args __user *uargs)
461 struct rtas_args args;
465 if (!capable(CAP_SYS_ADMIN))
468 if (copy_from_user(&args, uargs, 3 * sizeof(u32)) != 0)
472 if (nargs > ARRAY_SIZE(args.args)
473 || args.nret > ARRAY_SIZE(args.args)
474 || nargs + args.nret > ARRAY_SIZE(args.args))
478 if (copy_from_user(args.args, uargs->args,
479 nargs * sizeof(rtas_arg_t)) != 0)
482 spin_lock_irqsave(&rtas.lock, flags);
484 get_paca()->xRtas = args;
485 enter_rtas(__pa(&get_paca()->xRtas));
486 args = get_paca()->xRtas;
488 spin_unlock_irqrestore(&rtas.lock, flags);
490 args.rets = (rtas_arg_t *)&(args.args[nargs]);
491 if (args.rets[0] == -1)
492 log_rtas_error(&args);
495 if (copy_to_user(uargs->args + nargs,
497 args.nret * sizeof(rtas_arg_t)) != 0)
503 #ifdef CONFIG_HOTPLUG_CPU
504 /* This version can't take the spinlock. */
506 void rtas_stop_self(void)
508 struct rtas_args *rtas_args = &(get_paca()->xRtas);
512 rtas_args->token = rtas_token("stop-self");
513 BUG_ON(rtas_args->token == RTAS_UNKNOWN_SERVICE);
514 rtas_args->nargs = 0;
516 rtas_args->rets = &(rtas_args->args[0]);
518 printk("%u %u Ready to die...\n",
519 smp_processor_id(), hard_smp_processor_id());
520 enter_rtas(__pa(rtas_args));
522 panic("Alas, I survived.\n");
524 #endif /* CONFIG_HOTPLUG_CPU */
526 EXPORT_SYMBOL(rtas_firmware_flash_list);
527 EXPORT_SYMBOL(rtas_token);
528 EXPORT_SYMBOL(rtas_call);
529 EXPORT_SYMBOL(rtas_data_buf);
530 EXPORT_SYMBOL(rtas_data_buf_lock);
531 EXPORT_SYMBOL(rtas_extended_busy_delay_time);
532 EXPORT_SYMBOL(rtas_get_sensor);
533 EXPORT_SYMBOL(rtas_get_power_level);
534 EXPORT_SYMBOL(rtas_set_power_level);
535 EXPORT_SYMBOL(rtas_set_indicator);