2005-04-17 06:20:36 +08:00
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/*
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* c 2001 PPC 64 Team, IBM Corp
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* /dev/nvram driver for PPC64
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*
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* This perhaps should live in drivers/char
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*/
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/spinlock.h>
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2011-02-09 21:00:09 +08:00
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#include <linux/slab.h>
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#include <linux/kmsg_dump.h>
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2013-06-06 02:51:32 +08:00
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#include <linux/pstore.h>
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2011-07-25 15:54:50 +08:00
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#include <linux/ctype.h>
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2005-04-17 06:20:36 +08:00
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#include <asm/uaccess.h>
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#include <asm/nvram.h>
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#include <asm/rtas.h>
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#include <asm/prom.h>
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#include <asm/machdep.h>
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2010-07-29 13:28:20 +08:00
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/* Max bytes to read/write in one go */
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#define NVRW_CNT 0x20
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2005-04-17 06:20:36 +08:00
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static unsigned int nvram_size;
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static int nvram_fetch, nvram_store;
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static char nvram_buf[NVRW_CNT]; /* assume this is in the first 4GB */
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static DEFINE_SPINLOCK(nvram_lock);
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2011-02-09 21:00:09 +08:00
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/* See clobbering_unread_rtas_event() */
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#define NVRAM_RTAS_READ_TIMEOUT 5 /* seconds */
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static unsigned long last_unread_rtas_event; /* timestamp */
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2013-06-06 02:51:32 +08:00
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#ifdef CONFIG_PSTORE
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2015-02-06 03:36:04 +08:00
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unsigned long last_rtas_event;
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2013-06-06 02:51:32 +08:00
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#endif
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2005-04-17 06:20:36 +08:00
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static ssize_t pSeries_nvram_read(char *buf, size_t count, loff_t *index)
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{
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unsigned int i;
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unsigned long len;
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int done;
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unsigned long flags;
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char *p = buf;
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if (nvram_size == 0 || nvram_fetch == RTAS_UNKNOWN_SERVICE)
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return -ENODEV;
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if (*index >= nvram_size)
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return 0;
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i = *index;
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if (i + count > nvram_size)
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count = nvram_size - i;
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spin_lock_irqsave(&nvram_lock, flags);
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for (; count != 0; count -= len) {
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len = count;
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if (len > NVRW_CNT)
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len = NVRW_CNT;
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if ((rtas_call(nvram_fetch, 3, 2, &done, i, __pa(nvram_buf),
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len) != 0) || len != done) {
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spin_unlock_irqrestore(&nvram_lock, flags);
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return -EIO;
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}
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memcpy(p, nvram_buf, len);
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p += len;
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i += len;
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}
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spin_unlock_irqrestore(&nvram_lock, flags);
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*index = i;
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return p - buf;
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}
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static ssize_t pSeries_nvram_write(char *buf, size_t count, loff_t *index)
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{
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unsigned int i;
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unsigned long len;
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int done;
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unsigned long flags;
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const char *p = buf;
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if (nvram_size == 0 || nvram_store == RTAS_UNKNOWN_SERVICE)
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return -ENODEV;
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if (*index >= nvram_size)
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return 0;
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i = *index;
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if (i + count > nvram_size)
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count = nvram_size - i;
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spin_lock_irqsave(&nvram_lock, flags);
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for (; count != 0; count -= len) {
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len = count;
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if (len > NVRW_CNT)
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len = NVRW_CNT;
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memcpy(nvram_buf, p, len);
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if ((rtas_call(nvram_store, 3, 2, &done, i, __pa(nvram_buf),
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len) != 0) || len != done) {
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spin_unlock_irqrestore(&nvram_lock, flags);
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return -EIO;
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}
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p += len;
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i += len;
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}
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spin_unlock_irqrestore(&nvram_lock, flags);
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*index = i;
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return p - buf;
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}
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static ssize_t pSeries_nvram_get_size(void)
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{
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return nvram_size ? nvram_size : -ENODEV;
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}
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2015-02-06 03:36:04 +08:00
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/* nvram_write_error_log
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2010-08-02 09:18:09 +08:00
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*
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* We need to buffer the error logs into nvram to ensure that we have
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2015-02-06 03:36:04 +08:00
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* the failure information to decode.
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2010-08-02 09:18:09 +08:00
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*/
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2011-02-09 20:43:13 +08:00
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int nvram_write_error_log(char * buff, int length,
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unsigned int err_type, unsigned int error_log_cnt)
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{
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2011-02-09 21:00:09 +08:00
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int rc = nvram_write_os_partition(&rtas_log_partition, buff, length,
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2011-02-09 20:43:13 +08:00
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err_type, error_log_cnt);
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2013-06-06 02:51:44 +08:00
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if (!rc) {
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2011-02-09 21:00:09 +08:00
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last_unread_rtas_event = get_seconds();
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2013-06-06 02:51:44 +08:00
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#ifdef CONFIG_PSTORE
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last_rtas_event = get_seconds();
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#endif
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}
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2011-02-09 21:00:09 +08:00
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return rc;
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2011-02-09 20:43:13 +08:00
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}
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2013-06-06 02:51:16 +08:00
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/* nvram_read_error_log
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*
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* Reads nvram for error log for at most 'length'
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*/
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int nvram_read_error_log(char *buff, int length,
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unsigned int *err_type, unsigned int *error_log_cnt)
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{
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return nvram_read_partition(&rtas_log_partition, buff, length,
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err_type, error_log_cnt);
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}
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2010-08-02 09:18:09 +08:00
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/* This doesn't actually zero anything, but it sets the event_logged
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* word to tell that this event is safely in syslog.
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*/
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int nvram_clear_error_log(void)
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{
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loff_t tmp_index;
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int clear_word = ERR_FLAG_ALREADY_LOGGED;
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int rc;
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2011-02-09 20:43:13 +08:00
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if (rtas_log_partition.index == -1)
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2010-08-02 09:18:09 +08:00
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return -1;
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2011-02-09 20:43:13 +08:00
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tmp_index = rtas_log_partition.index;
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2010-08-02 09:18:09 +08:00
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rc = ppc_md.nvram_write((char *)&clear_word, sizeof(int), &tmp_index);
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if (rc <= 0) {
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printk(KERN_ERR "nvram_clear_error_log: Failed nvram_write (%d)\n", rc);
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return rc;
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}
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2011-02-09 21:00:09 +08:00
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last_unread_rtas_event = 0;
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2010-08-02 09:18:09 +08:00
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return 0;
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}
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2013-06-06 02:51:32 +08:00
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/*
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* Are we using the ibm,rtas-log for oops/panic reports? And if so,
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* would logging this oops/panic overwrite an RTAS event that rtas_errd
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* hasn't had a chance to read and process? Return 1 if so, else 0.
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*
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* We assume that if rtas_errd hasn't read the RTAS event in
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* NVRAM_RTAS_READ_TIMEOUT seconds, it's probably not going to.
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*/
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2015-02-06 03:36:04 +08:00
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int clobbering_unread_rtas_event(void)
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2013-06-06 02:51:32 +08:00
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{
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return (oops_log_partition.index == rtas_log_partition.index
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&& last_unread_rtas_event
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&& get_seconds() - last_unread_rtas_event <=
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NVRAM_RTAS_READ_TIMEOUT);
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}
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2011-02-09 20:43:13 +08:00
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static int __init pseries_nvram_init_log_partitions(void)
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{
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2011-02-09 21:00:09 +08:00
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int rc;
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2013-10-30 21:47:06 +08:00
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/* Scan nvram for partitions */
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nvram_scan_partitions();
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2015-02-06 03:36:04 +08:00
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rc = nvram_init_os_partition(&rtas_log_partition);
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2011-02-09 21:00:09 +08:00
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nvram_init_oops_partition(rc == 0);
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2011-02-09 20:43:13 +08:00
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return 0;
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}
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machine_arch_initcall(pseries, pseries_nvram_init_log_partitions);
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2010-08-02 09:18:09 +08:00
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2005-04-17 06:20:36 +08:00
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int __init pSeries_nvram_init(void)
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{
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struct device_node *nvram;
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2013-10-30 21:47:07 +08:00
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const __be32 *nbytes_p;
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2006-07-12 13:39:43 +08:00
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unsigned int proplen;
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2005-04-17 06:20:36 +08:00
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nvram = of_find_node_by_type(NULL, "nvram");
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if (nvram == NULL)
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return -ENODEV;
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2007-04-03 20:26:41 +08:00
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nbytes_p = of_get_property(nvram, "#bytes", &proplen);
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2008-06-09 20:20:04 +08:00
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if (nbytes_p == NULL || proplen != sizeof(unsigned int)) {
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of_node_put(nvram);
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2005-04-17 06:20:36 +08:00
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return -EIO;
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2008-06-09 20:20:04 +08:00
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}
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2005-04-17 06:20:36 +08:00
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2013-10-30 21:47:07 +08:00
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nvram_size = be32_to_cpup(nbytes_p);
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2005-04-17 06:20:36 +08:00
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nvram_fetch = rtas_token("nvram-fetch");
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nvram_store = rtas_token("nvram-store");
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printk(KERN_INFO "PPC64 nvram contains %d bytes\n", nvram_size);
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of_node_put(nvram);
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ppc_md.nvram_read = pSeries_nvram_read;
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ppc_md.nvram_write = pSeries_nvram_write;
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ppc_md.nvram_size = pSeries_nvram_get_size;
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return 0;
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}
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2011-02-09 21:00:09 +08:00
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