99 lines
2.0 KiB
C
99 lines
2.0 KiB
C
/*
|
|
* PowerNV nvram code.
|
|
*
|
|
* Copyright 2011 IBM Corp.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*/
|
|
|
|
#define DEBUG
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/init.h>
|
|
#include <linux/of.h>
|
|
|
|
#include <asm/opal.h>
|
|
#include <asm/nvram.h>
|
|
#include <asm/machdep.h>
|
|
|
|
static unsigned int nvram_size;
|
|
|
|
static ssize_t opal_nvram_size(void)
|
|
{
|
|
return nvram_size;
|
|
}
|
|
|
|
static ssize_t opal_nvram_read(char *buf, size_t count, loff_t *index)
|
|
{
|
|
s64 rc;
|
|
int off;
|
|
|
|
if (*index >= nvram_size)
|
|
return 0;
|
|
off = *index;
|
|
if ((off + count) > nvram_size)
|
|
count = nvram_size - off;
|
|
rc = opal_read_nvram(__pa(buf), count, off);
|
|
if (rc != OPAL_SUCCESS)
|
|
return -EIO;
|
|
*index += count;
|
|
return count;
|
|
}
|
|
|
|
static ssize_t opal_nvram_write(char *buf, size_t count, loff_t *index)
|
|
{
|
|
s64 rc = OPAL_BUSY;
|
|
int off;
|
|
|
|
if (*index >= nvram_size)
|
|
return 0;
|
|
off = *index;
|
|
if ((off + count) > nvram_size)
|
|
count = nvram_size - off;
|
|
|
|
while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
|
|
rc = opal_write_nvram(__pa(buf), count, off);
|
|
if (rc == OPAL_BUSY_EVENT)
|
|
opal_poll_events(NULL);
|
|
}
|
|
*index += count;
|
|
return count;
|
|
}
|
|
|
|
static int __init opal_nvram_init_log_partitions(void)
|
|
{
|
|
/* Scan nvram for partitions */
|
|
nvram_scan_partitions();
|
|
nvram_init_oops_partition(0);
|
|
return 0;
|
|
}
|
|
machine_arch_initcall(powernv, opal_nvram_init_log_partitions);
|
|
|
|
void __init opal_nvram_init(void)
|
|
{
|
|
struct device_node *np;
|
|
const __be32 *nbytes_p;
|
|
|
|
np = of_find_compatible_node(NULL, NULL, "ibm,opal-nvram");
|
|
if (np == NULL)
|
|
return;
|
|
|
|
nbytes_p = of_get_property(np, "#bytes", NULL);
|
|
if (!nbytes_p) {
|
|
of_node_put(np);
|
|
return;
|
|
}
|
|
nvram_size = be32_to_cpup(nbytes_p);
|
|
|
|
pr_info("OPAL nvram setup, %u bytes\n", nvram_size);
|
|
of_node_put(np);
|
|
|
|
ppc_md.nvram_read = opal_nvram_read;
|
|
ppc_md.nvram_write = opal_nvram_write;
|
|
ppc_md.nvram_size = opal_nvram_size;
|
|
}
|
|
|