drivers/mtd/spi/stmicro.c

/*
 * (C) Copyright 2000-2002
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
 * Copyright 2008, Network Appliance Inc.
 * Jason McMullan <mcmullan@netapp.com>
 *
 * Copyright (C) 2004-2007 Freescale Semiconductor, Inc.
 * TsiChung Liew (Tsi-Chung.Liew@freescale.com)
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

#include <common.h>
#include <malloc.h>
#include <spi_flash.h>

#include "spi_flash_internal.h"

/* M25Pxx-specific commands */
#define CMD_M25PXX_SE		0xd8	/* Sector Erase */
#define CMD_M25PXX_BE		0xc7	/* Bulk Erase */
#define CMD_M25PXX_RES		0xab	/* Release from DP, and Read Signature */

struct stmicro_spi_flash_params {
	u8 idcode1;
	u16 pages_per_sector;
	u16 nr_sectors;
	const char *name;
};

static const struct stmicro_spi_flash_params stmicro_spi_flash_table[] = {
	{
		.idcode1 = 0x11,
		.pages_per_sector = 128,
		.nr_sectors = 4,
		.name = "M25P10",
	},
	{
		.idcode1 = 0x15,
		.pages_per_sector = 256,
		.nr_sectors = 32,
		.name = "M25P16",
	},
	{
		.idcode1 = 0x12,
		.pages_per_sector = 256,
		.nr_sectors = 4,
		.name = "M25P20",
	},
	{
		.idcode1 = 0x16,
		.pages_per_sector = 256,
		.nr_sectors = 64,
		.name = "M25P32",
	},
	{
		.idcode1 = 0x13,
		.pages_per_sector = 256,
		.nr_sectors = 8,
		.name = "M25P40",
	},
	{
		.idcode1 = 0x17,
		.pages_per_sector = 256,
		.nr_sectors = 128,
		.name = "M25P64",
	},
	{
		.idcode1 = 0x14,
		.pages_per_sector = 256,
		.nr_sectors = 16,
		.name = "M25P80",
	},
	{
		.idcode1 = 0x18,
		.pages_per_sector = 1024,
		.nr_sectors = 64,
		.name = "M25P128",
	},
};

static int stmicro_erase(struct spi_flash *flash, u32 offset, size_t len)
{
	return spi_flash_cmd_erase(flash, CMD_M25PXX_SE, offset, len);
}

struct spi_flash *spi_flash_probe_stmicro(struct spi_slave *spi, u8 * idcode)
{
	const struct stmicro_spi_flash_params *params;
	struct spi_flash *flash;
	unsigned int i;

	if (idcode[0] == 0xff) {
		i = spi_flash_cmd(spi, CMD_M25PXX_RES,
				  idcode, 4);
		if (i)
			return NULL;
		if ((idcode[3] & 0xf0) == 0x10) {
			idcode[0] = 0x20;
			idcode[1] = 0x20;
			idcode[2] = idcode[3] + 1;
		} else
			return NULL;
	}

	for (i = 0; i < ARRAY_SIZE(stmicro_spi_flash_table); i++) {
		params = &stmicro_spi_flash_table[i];
		if (params->idcode1 == idcode[2]) {
			break;
		}
	}

	if (i == ARRAY_SIZE(stmicro_spi_flash_table)) {
		debug("SF: Unsupported STMicro ID %02x\n", idcode[1]);
		return NULL;
	}

	flash = malloc(sizeof(*flash));
	if (!flash) {
		debug("SF: Failed to allocate memory\n");
		return NULL;
	}

	flash->spi = spi;
	flash->name = params->name;

	flash->write = spi_flash_cmd_write_multi;
	flash->erase = stmicro_erase;
	flash->read = spi_flash_cmd_read_fast;
	flash->page_size = 256;
	flash->sector_size = 256 * params->pages_per_sector;
	flash->size = flash->sector_size * params->nr_sectors;

	return flash;
}