9b29aad526
This reverts commit 9270553fff.
Change-Id: I195f721ce7a18aac6c1aa6f4e0f9284455d531b0
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/8138
Tested-by: build bot (Jenkins)
Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
88 lines
2.1 KiB
C
88 lines
2.1 KiB
C
/*
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* This file is part of the coreboot project.
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*
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* Copyright (C) 2013 Google Inc.
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* Copyright (C) 2014 Sage Electronic Engineering, LLC.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <stdint.h>
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#include <stddef.h>
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#include <console/console.h>
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#include <string.h>
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#include <spi-generic.h>
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#include <spi_flash.h>
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#include <baytrail/nvm.h>
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/* This module assumes the flash is memory mapped just below 4GiB in the
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* address space for reading. Also this module assumes an area it erased
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* when all bytes read as all 0xff's. */
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static struct spi_flash *flash;
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static int nvm_init(void)
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{
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if (flash != NULL)
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return 0;
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spi_init();
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flash = spi_flash_probe(0, 0);
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if (!flash) {
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printk(BIOS_DEBUG, "Could not find SPI device\n");
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return -1;
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}
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return 0;
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}
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/* Convert memory mapped pointer to flash offset. */
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static inline uint32_t to_flash_offset(void *p)
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{
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#ifndef CONFIG_ROM_SIZE
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#error CONFIG_ROM_SIZE must be set.
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#endif
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return CONFIG_ROM_SIZE + (uintptr_t)p;
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}
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int nvm_is_erased(const void *start, size_t size)
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{
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const uint8_t *cur = start;
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const uint8_t erased_value = 0xff;
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while (size > 0) {
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if (*cur != erased_value)
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return 0;
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cur++;
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size--;
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}
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return 1;
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}
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int nvm_erase(void *start, size_t size)
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{
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if (nvm_init() < 0)
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return -1;
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flash->erase(flash, to_flash_offset(start), size);
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return 0;
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}
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/* Write data to NVM. Returns 0 on success < 0 on error. */
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int nvm_write(void *start, const void *data, size_t size)
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{
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if (nvm_init() < 0)
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return -1;
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flash->write(flash, to_flash_offset(start), size, data);
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return 0;
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}
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