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 char rtas_err_buf[RTAS_ERROR_LOG_MAX];
63 extern unsigned long reloc_offset(void);
65 spinlock_t rtas_data_buf_lock = SPIN_LOCK_UNLOCKED;
66 char rtas_data_buf[RTAS_DATA_BUF_SIZE]__page_aligned;
69 call_rtas_display_status(char c)
71 struct rtas_args *args = &(get_paca()->xRtas);
74 spin_lock_irqsave(&rtas.lock, s);
79 args->rets = (rtas_arg_t *)&(args->args[1]);
80 args->args[0] = (int)c;
82 enter_rtas(__pa(args));
84 spin_unlock_irqrestore(&rtas.lock, s);
88 rtas_token(const char *service)
91 if (rtas.dev == NULL) {
92 PPCDBG(PPCDBG_RTAS,"\tNo rtas device in device-tree...\n");
93 return RTAS_UNKNOWN_SERVICE;
95 tokp = (int *) get_property(rtas.dev, service, NULL);
96 return tokp ? *tokp : RTAS_UNKNOWN_SERVICE;
101 __log_rtas_error(struct rtas_args *rtas_args)
103 struct rtas_args err_args, temp_args;
105 err_args.token = rtas_token("rtas-last-error");
108 err_args.rets = (rtas_arg_t *)&(err_args.args[2]);
110 err_args.args[0] = (rtas_arg_t)__pa(rtas_err_buf);
111 err_args.args[1] = RTAS_ERROR_LOG_MAX;
112 err_args.args[2] = 0;
114 temp_args = *rtas_args;
115 get_paca()->xRtas = err_args;
117 PPCDBG(PPCDBG_RTAS, "\tentering rtas with 0x%lx\n",
119 enter_rtas(__pa(&get_paca()->xRtas));
120 PPCDBG(PPCDBG_RTAS, "\treturned from rtas ...\n");
122 err_args = get_paca()->xRtas;
123 get_paca()->xRtas = temp_args;
125 return err_args.rets[0];
129 log_rtas_error(struct rtas_args *rtas_args)
134 spin_lock_irqsave(&rtas.lock, s);
135 rc = __log_rtas_error(rtas_args);
136 spin_unlock_irqrestore(&rtas.lock, s);
138 log_error(rtas_err_buf, ERR_TYPE_RTAS_LOG, 0);
142 rtas_call(int token, int nargs, int nret,
143 unsigned long *outputs, ...)
148 struct rtas_args *rtas_args = &(get_paca()->xRtas);
151 PPCDBG(PPCDBG_RTAS, "Entering rtas_call\n");
152 PPCDBG(PPCDBG_RTAS, "\ttoken = 0x%x\n", token);
153 PPCDBG(PPCDBG_RTAS, "\tnargs = %d\n", nargs);
154 PPCDBG(PPCDBG_RTAS, "\tnret = %d\n", nret);
155 PPCDBG(PPCDBG_RTAS, "\t&outputs = 0x%lx\n", outputs);
156 if (token == RTAS_UNKNOWN_SERVICE)
159 /* Gotta do something different here, use global lock for now... */
160 spin_lock_irqsave(&rtas.lock, s);
162 rtas_args->token = token;
163 rtas_args->nargs = nargs;
164 rtas_args->nret = nret;
165 rtas_args->rets = (rtas_arg_t *)&(rtas_args->args[nargs]);
166 va_start(list, outputs);
167 for (i = 0; i < nargs; ++i) {
168 rtas_args->args[i] = (rtas_arg_t)LONG_LSW(va_arg(list, ulong));
169 PPCDBG(PPCDBG_RTAS, "\tnarg[%d] = 0x%lx\n", i, rtas_args->args[i]);
173 for (i = 0; i < nret; ++i)
174 rtas_args->rets[i] = 0;
176 PPCDBG(PPCDBG_RTAS, "\tentering rtas with 0x%lx\n",
178 enter_rtas(__pa(rtas_args));
179 PPCDBG(PPCDBG_RTAS, "\treturned from rtas ...\n");
181 if (rtas_args->rets[0] == -1)
182 logit = (__log_rtas_error(rtas_args) == 0);
184 ifppcdebug(PPCDBG_RTAS) {
185 for(i=0; i < nret ;i++)
186 udbg_printf("\tnret[%d] = 0x%lx\n", i, (ulong)rtas_args->rets[i]);
189 if (nret > 1 && outputs != NULL)
190 for (i = 0; i < nret-1; ++i)
191 outputs[i] = rtas_args->rets[i+1];
192 ret = (ulong)((nret > 0) ? rtas_args->rets[0] : 0);
194 /* Gotta do something different here, use global lock for now... */
195 spin_unlock_irqrestore(&rtas.lock, s);
198 log_error(rtas_err_buf, ERR_TYPE_RTAS_LOG, 0);
203 /* Given an RTAS status code of 990n compute the hinted delay of 10^n
204 * (last digit) milliseconds. For now we bound at n=5 (100 sec).
207 rtas_extended_busy_delay_time(int status)
209 int order = status - 9900;
213 order = 0; /* RTC depends on this for -2 clock busy */
215 order = 5; /* bound */
217 /* Use microseconds for reasonable accuracy */
218 for (ms=1; order > 0; order--)
225 rtas_get_power_level(int powerdomain, int *level)
227 int token = rtas_token("get-power-level");
231 if (token == RTAS_UNKNOWN_SERVICE)
232 return RTAS_UNKNOWN_OP;
235 rc = (int) rtas_call(token, 1, 2, &powerlevel, powerdomain);
241 *level = (int) powerlevel;
246 rtas_set_power_level(int powerdomain, int level, int *setlevel)
248 int token = rtas_token("set-power-level");
249 unsigned int wait_time;
253 if (token == RTAS_UNKNOWN_SERVICE)
254 return RTAS_UNKNOWN_OP;
257 rc = (int) rtas_call(token, 2, 2, &returned_level, powerdomain,
261 else if (rtas_is_extended_busy(rc)) {
262 wait_time = rtas_extended_busy_delay_time(rc);
263 udelay(wait_time * 1000);
268 *setlevel = (int) returned_level;
273 rtas_get_sensor(int sensor, int index, int *state)
275 int token = rtas_token("get-sensor-state");
276 unsigned int wait_time;
280 if (token == RTAS_UNKNOWN_SERVICE)
281 return RTAS_UNKNOWN_OP;
284 rc = (int) rtas_call(token, 2, 2, &returned_state, sensor,
288 else if (rtas_is_extended_busy(rc)) {
289 wait_time = rtas_extended_busy_delay_time(rc);
290 udelay(wait_time * 1000);
295 *state = (int) returned_state;
300 rtas_set_indicator(int indicator, int index, int new_value)
302 int token = rtas_token("set-indicator");
303 unsigned int wait_time;
306 if (token == RTAS_UNKNOWN_SERVICE)
307 return RTAS_UNKNOWN_OP;
310 rc = (int) rtas_call(token, 3, 1, NULL, indicator, index,
314 else if (rtas_is_extended_busy(rc)) {
315 wait_time = rtas_extended_busy_delay_time(rc);
316 udelay(wait_time * 1000);
325 #define FLASH_BLOCK_LIST_VERSION (1UL)
327 rtas_flash_firmware(void)
329 unsigned long image_size;
330 struct flash_block_list *f, *next, *flist;
331 unsigned long rtas_block_list;
332 int i, status, update_token;
334 update_token = rtas_token("ibm,update-flash-64-and-reboot");
335 if (update_token == RTAS_UNKNOWN_SERVICE) {
336 printk(KERN_ALERT "FLASH: ibm,update-flash-64-and-reboot is not available -- not a service partition?\n");
337 printk(KERN_ALERT "FLASH: firmware will not be flashed\n");
341 /* NOTE: the "first" block list is a global var with no data
342 * blocks in the kernel data segment. We do this because
343 * we want to ensure this block_list addr is under 4GB.
345 rtas_firmware_flash_list.num_blocks = 0;
346 flist = (struct flash_block_list *)&rtas_firmware_flash_list;
347 rtas_block_list = virt_to_abs(flist);
348 if (rtas_block_list >= 4UL*1024*1024*1024) {
349 printk(KERN_ALERT "FLASH: kernel bug...flash list header addr above 4GB\n");
353 printk(KERN_ALERT "FLASH: preparing saved firmware image for flash\n");
354 /* Update the block_list in place. */
356 for (f = flist; f; f = next) {
357 /* Translate data addrs to absolute */
358 for (i = 0; i < f->num_blocks; i++) {
359 f->blocks[i].data = (char *)virt_to_abs(f->blocks[i].data);
360 image_size += f->blocks[i].length;
363 /* Don't translate NULL pointer for last entry */
365 f->next = (struct flash_block_list *)virt_to_abs(f->next);
368 /* make num_blocks into the version/length field */
369 f->num_blocks = (FLASH_BLOCK_LIST_VERSION << 56) | ((f->num_blocks+1)*16);
372 printk(KERN_ALERT "FLASH: flash image is %ld bytes\n", image_size);
373 printk(KERN_ALERT "FLASH: performing flash and reboot\n");
374 ppc_md.progress("Flashing \n", 0x0);
375 ppc_md.progress("Please Wait... ", 0x0);
376 printk(KERN_ALERT "FLASH: this will take several minutes. Do not power off!\n");
377 status = rtas_call(update_token, 1, 1, NULL, rtas_block_list);
378 switch (status) { /* should only get "bad" status */
380 printk(KERN_ALERT "FLASH: success\n");
383 printk(KERN_ALERT "FLASH: hardware error. Firmware may not be not flashed\n");
386 printk(KERN_ALERT "FLASH: image is corrupt or not correct for this platform. Firmware not flashed\n");
389 printk(KERN_ALERT "FLASH: flash failed when partially complete. System may not reboot\n");
392 printk(KERN_ALERT "FLASH: unknown flash return code %d\n", status);
397 void rtas_flash_bypass_warning(void)
399 printk(KERN_ALERT "FLASH: firmware flash requires a reboot\n");
400 printk(KERN_ALERT "FLASH: the firmware image will NOT be flashed\n");
405 rtas_restart(char *cmd)
407 if (rtas_firmware_flash_list.next)
408 rtas_flash_firmware();
410 printk("RTAS system-reboot returned %ld\n",
411 rtas_call(rtas_token("system-reboot"), 0, 1, NULL));
418 if (rtas_firmware_flash_list.next)
419 rtas_flash_bypass_warning();
420 /* allow power on only with power button press */
421 printk("RTAS power-off returned %ld\n",
422 rtas_call(rtas_token("power-off"), 2, 1, NULL,0xffffffff,0xffffffff));
429 if (rtas_firmware_flash_list.next)
430 rtas_flash_bypass_warning();
434 /* Must be in the RMO region, so we place it here */
435 static char rtas_os_term_buf[2048];
437 void rtas_os_term(char *str)
441 snprintf(rtas_os_term_buf, 2048, "OS panic: %s", str);
444 status = rtas_call(rtas_token("ibm,os-term"), 1, 1, NULL,
445 __pa(rtas_os_term_buf));
447 if (status == RTAS_BUSY)
449 else if (status != 0)
450 printk(KERN_EMERG "ibm,os-term call failed %ld\n",
452 } while (status == RTAS_BUSY);
455 unsigned long rtas_rmo_buf = 0;
457 asmlinkage int ppc_rtas(struct rtas_args __user *uargs)
459 struct rtas_args args;
463 if (!capable(CAP_SYS_ADMIN))
466 if (copy_from_user(&args, uargs, 3 * sizeof(u32)) != 0)
470 if (nargs > ARRAY_SIZE(args.args)
471 || args.nret > ARRAY_SIZE(args.args)
472 || nargs + args.nret > ARRAY_SIZE(args.args))
476 if (copy_from_user(args.args, uargs->args,
477 nargs * sizeof(rtas_arg_t)) != 0)
480 spin_lock_irqsave(&rtas.lock, flags);
482 get_paca()->xRtas = args;
483 enter_rtas(__pa(&get_paca()->xRtas));
484 args = get_paca()->xRtas;
486 spin_unlock_irqrestore(&rtas.lock, flags);
488 args.rets = (rtas_arg_t *)&(args.args[nargs]);
489 if (args.rets[0] == -1)
490 log_rtas_error(&args);
493 if (copy_to_user(uargs->args + nargs,
495 args.nret * sizeof(rtas_arg_t)) != 0)
501 #ifdef CONFIG_HOTPLUG_CPU
502 /* This version can't take the spinlock. */
504 void rtas_stop_self(void)
506 struct rtas_args *rtas_args = &(get_paca()->xRtas);
510 rtas_args->token = rtas_token("stop-self");
511 BUG_ON(rtas_args->token == RTAS_UNKNOWN_SERVICE);
512 rtas_args->nargs = 0;
514 rtas_args->rets = &(rtas_args->args[0]);
516 printk("%u %u Ready to die...\n",
517 smp_processor_id(), hard_smp_processor_id());
518 enter_rtas(__pa(rtas_args));
520 panic("Alas, I survived.\n");
522 #endif /* CONFIG_HOTPLUG_CPU */
524 EXPORT_SYMBOL(rtas_firmware_flash_list);
525 EXPORT_SYMBOL(rtas_token);
526 EXPORT_SYMBOL(rtas_call);
527 EXPORT_SYMBOL(rtas_data_buf);
528 EXPORT_SYMBOL(rtas_data_buf_lock);
529 EXPORT_SYMBOL(rtas_extended_busy_delay_time);
530 EXPORT_SYMBOL(rtas_get_sensor);
531 EXPORT_SYMBOL(rtas_get_power_level);
532 EXPORT_SYMBOL(rtas_set_power_level);
533 EXPORT_SYMBOL(rtas_set_indicator);