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/* Copyright 2013-2014 IBM Corp.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
* implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <skiboot.h>
#include <fsp.h>
#include <opal.h>
#include <lock.h>
#include <device.h>
#include <platform.h>
#include <nvram.h>
static void *nvram_image;
static uint32_t nvram_size;
static bool nvram_ready; /* has the nvram been loaded? */
static bool nvram_valid; /* is the nvram format ok? */
static int64_t opal_read_nvram(uint64_t buffer, uint64_t size, uint64_t offset)
{
if (!nvram_ready)
return OPAL_HARDWARE;
if (!opal_addr_valid((void *)buffer))
return OPAL_PARAMETER;
if (offset >= nvram_size || (offset + size) > nvram_size)
return OPAL_PARAMETER;
memcpy((void *)buffer, nvram_image + offset, size);
return OPAL_SUCCESS;
}
opal_call(OPAL_READ_NVRAM, opal_read_nvram, 3);
static int64_t opal_write_nvram(uint64_t buffer, uint64_t size, uint64_t offset)
{
if (!nvram_ready)
return OPAL_HARDWARE;
if (!opal_addr_valid((void *)buffer))
return OPAL_PARAMETER;
if (offset >= nvram_size || (offset + size) > nvram_size)
return OPAL_PARAMETER;
memcpy(nvram_image + offset, (void *)buffer, size);
if (platform.nvram_write)
platform.nvram_write(offset, nvram_image + offset, size);
/* The host OS has written to the NVRAM so we can't be sure that it's
* well formatted.
*/
nvram_valid = false;
return OPAL_SUCCESS;
}
opal_call(OPAL_WRITE_NVRAM, opal_write_nvram, 3);
bool nvram_validate(void)
{
if (!nvram_valid)
nvram_valid = !nvram_check(nvram_image, nvram_size);
return nvram_valid;
}
static void nvram_reformat(void)
{
if (nvram_format(nvram_image, nvram_size)) {
prerror("NVRAM: Failed to format NVRAM!\n");
nvram_valid = false;
return;
}
/* Write the whole thing back */
if (platform.nvram_write)
platform.nvram_write(0, nvram_image, nvram_size);
nvram_valid = true;
}
void nvram_reinit(void)
{
/* It's possible we failed to load nvram at boot. */
if (!nvram_ready)
nvram_init();
else if (!nvram_validate())
nvram_reformat();
}
void nvram_read_complete(bool success)
{
struct dt_node *np;
/* Read not successful, error out and free the buffer */
if (!success) {
free(nvram_image);
nvram_size = 0;
return;
}
if (!nvram_validate())
nvram_reformat();
/* Add nvram node */
np = dt_new(opal_node, "nvram");
dt_add_property_cells(np, "#bytes", nvram_size);
dt_add_property_string(np, "compatible", "ibm,opal-nvram");
/* Mark ready */
nvram_ready = true;
}
void nvram_init(void)
{
int rc;
if (!platform.nvram_info)
return;
rc = platform.nvram_info(&nvram_size);
if (rc) {
prerror("NVRAM: Error %d retrieving nvram info\n", rc);
return;
}
printf("NVRAM: Size is %d KB\n", nvram_size >> 10);
if (nvram_size > 0x100000) {
printf("NVRAM: Cropping to 1MB !\n");
nvram_size = 0x100000;
}
/*
* We allocate the nvram image with 4k alignment to make the
* FSP backend job's easier
*/
nvram_image = memalign(0x1000, nvram_size);
if (!nvram_image) {
prerror("NVRAM: Failed to allocate nvram image\n");
nvram_size = 0;
return;
}
/* Read it in */
rc = platform.nvram_start_read(nvram_image, 0, nvram_size);
if (rc) {
prerror("NVRAM: Failed to read NVRAM from FSP !\n");
nvram_size = 0;
free(nvram_image);
return;
}
/*
* We'll get called back later (or recursively from
* nvram_start_read) in nvram_read_complete()
*/
}
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