/*
 * Copyright (C) 2009 Freescale Semiconductor, Inc.
 *
 * Author: Mingkai Hu (Mingkai.hu@freescale.com)
 * Based on stmicro.c by Wolfgang Denk (wd@denx.de),
 * TsiChung Liew (Tsi-Chung.Liew@freescale.com),
 * and  Jason McMullan (mcmullan@netapp.com)
 *
 * 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.
 */

#include <stdlib.h>
#include <spi_flash.h>

#include "spi_flash_internal.h"

/* S25FLxx-specific commands */
#define CMD_S25FLXX_READ	0x03	/* Read Data Bytes */
#define CMD_S25FLXX_FAST_READ	0x0b	/* Read Data Bytes at Higher Speed */
#define CMD_S25FLXX_READID	0x90	/* Read Manufacture ID and Device ID */
#define CMD_S25FLXX_WREN	0x06	/* Write Enable */
#define CMD_S25FLXX_WRDI	0x04	/* Write Disable */
#define CMD_S25FLXX_RDSR	0x05	/* Read Status Register */
#define CMD_S25FLXX_WRSR	0x01	/* Write Status Register */
#define CMD_S25FLXX_PP		0x02	/* Page Program */
#define CMD_S25FLXX_SE		0xd8	/* Sector Erase */
#define CMD_S25FLXX_BE		0xc7	/* Bulk Erase */
#define CMD_S25FLXX_DP		0xb9	/* Deep Power-down */
#define CMD_S25FLXX_RES		0xab	/* Release from DP, and Read Signature */

#define SPSN_MANUFACTURER_ID_S25FL116K	0x01
#define SPSN_ID_S25FL008A	0x0213
#define SPSN_ID_S25FL016A	0x0214
#define SPSN_ID_S25FL032A	0x0215
#define SPSN_ID_S25FL064A	0x0216
#define SPSN_ID_S25FL128S	0x0219
#define SPSN_ID_S25FL128P	0x2018
#define SPSN_ID_S25FL116K	0x4015
#define SPSN_EXT_ID_S25FL128P_256KB	0x0300
#define SPSN_EXT_ID_S25FL128P_64KB	0x0301
#define SPSN_EXT_ID_S25FL032P		0x4d00
#define SPSN_EXT_ID_S25FLXXS_64KB	0x4d01

struct spansion_spi_flash_params {
	u8  idcode0;
	u16 idcode1;
	u16 idcode2;
	int (*identify) (const struct spansion_spi_flash_params *params,
			u8 *idcode);
	u16 page_size;
	u16 pages_per_sector;
	u16 nr_sectors;
	const char *name;
};

struct spansion_spi_flash {
	struct spi_flash flash;
	const struct spansion_spi_flash_params *params;
};

static inline struct spansion_spi_flash *to_spansion_spi_flash(struct spi_flash
							     *flash)
{
	return container_of(flash, struct spansion_spi_flash, flash);
}

/*
 * returns non-zero if the given idcode matches the ID of the chip. this is for
 * chips which use 2nd, 3rd, 4th, and 5th byte.
 */
static int identify_2345(const struct spansion_spi_flash_params *params,
			 u8 *idcode)
{
	u16 jedec = idcode[1] << 8 | idcode[2];
	u16 ext_jedec = idcode[3] << 8 | idcode[4];
	return (params->idcode1 == jedec) && (params->idcode2 == ext_jedec);
}

/*
 * returns non-zero if the given idcode matches the ID of the chip. this is for
 * chips which use 1st, 2nd, and 3rd byte.
 */
static int identify_123(const struct spansion_spi_flash_params *params,
			u8 *idcode)
{
	u16 jedec = idcode[1] << 8 | idcode[2];
	return (params->idcode0 == idcode[0]) && (params->idcode1 == jedec);
}

static const struct spansion_spi_flash_params spansion_spi_flash_table[] = {
	{
		.idcode0 = 0,
		.idcode1 = SPSN_ID_S25FL008A,
		.idcode2 = 0,
		.identify = identify_2345,
		.page_size = 256,
		.pages_per_sector = 256,
		.nr_sectors = 16,
		.name = "S25FL008A",
	},
	{
		.idcode0 = 0,
		.idcode1 = SPSN_ID_S25FL016A,
		.idcode2 = 0,
		.identify = identify_2345,
		.page_size = 256,
		.pages_per_sector = 256,
		.nr_sectors = 32,
		.name = "S25FL016A",
	},
	{
		.idcode0 = 0,
		.idcode1 = SPSN_ID_S25FL032A,
		.idcode2 = 0,
		.identify = identify_2345,
		.page_size = 256,
		.pages_per_sector = 256,
		.nr_sectors = 64,
		.name = "S25FL032A",
	},
	{
		.idcode0 = 0,
		.idcode1 = SPSN_ID_S25FL064A,
		.idcode2 = 0,
		.identify = identify_2345,
		.page_size = 256,
		.pages_per_sector = 256,
		.nr_sectors = 128,
		.name = "S25FL064A",
	},
	{
		.idcode0 = 0,
		.idcode1 = SPSN_ID_S25FL128P,
		.idcode2 = SPSN_EXT_ID_S25FL128P_64KB,
		.identify = identify_2345,
		.page_size = 256,
		.pages_per_sector = 256,
		.nr_sectors = 256,
		.name = "S25FL128P_64K",
	},
	{
		.idcode0 = 0,
		.idcode1 = SPSN_ID_S25FL128P,
		.idcode2 = SPSN_EXT_ID_S25FL128P_256KB,
		.identify = identify_2345,
		.page_size = 256,
		.pages_per_sector = 1024,
		.nr_sectors = 64,
		.name = "S25FL128P_256K",
	},
	{
		.idcode0 = 0,
		.idcode1 = SPSN_ID_S25FL128S,
		.idcode2 = SPSN_EXT_ID_S25FLXXS_64KB,
		.identify = identify_2345,
		.page_size = 256,
		.pages_per_sector = 256,
		.nr_sectors = 512,
		.name = "S25FL128S_256K",
	},
	{
		.idcode0 = 0,
		.idcode1 = SPSN_ID_S25FL032A,
		.idcode2 = SPSN_EXT_ID_S25FL032P,
		.identify = identify_2345,
		.page_size = 256,
		.pages_per_sector = 256,
		.nr_sectors = 64,
		.name = "S25FL032P",
	},
	{
		.idcode0 = 0,
		.idcode1 = SPSN_ID_S25FL128P,
		.idcode2 = SPSN_EXT_ID_S25FLXXS_64KB,
		.identify = identify_2345,
		.page_size = 256,
		.pages_per_sector = 256,
		.nr_sectors = 256,
		.name = "25FS128S",
	},
	{
		.idcode0 = SPSN_MANUFACTURER_ID_S25FL116K,
		.idcode1 = SPSN_ID_S25FL116K,
		.idcode2 = 0,
		.identify = identify_123,
		.page_size = 256,
		.pages_per_sector = 256,
		.nr_sectors = 32,
		.name = "S25FL116K_16M",
	},
};

static int spansion_write(struct spi_flash *flash,
			 u32 offset, size_t len, const void *buf)
{
	struct spansion_spi_flash *spsn = to_spansion_spi_flash(flash);
	unsigned long page_addr;
	unsigned long byte_addr;
	unsigned long page_size;
	size_t chunk_len;
	size_t actual;
	int ret = 0;
	u8 cmd[4];

	page_size = spsn->params->page_size;
	page_addr = offset / page_size;
	byte_addr = offset % page_size;

	flash->spi->rw = SPI_WRITE_FLAG;

	for (actual = 0; actual < len; actual += chunk_len) {
		chunk_len = min(len - actual, page_size - byte_addr);

		cmd[0] = CMD_S25FLXX_PP;
		cmd[1] = page_addr >> 8;
		cmd[2] = page_addr;
		cmd[3] = byte_addr;

#if CONFIG_DEBUG_SPI_FLASH
		printk(BIOS_SPEW, "PP: 0x%p => cmd = { 0x%02x 0x%02x%02x%02x }"
		     " chunk_len = %zu\n",
		     buf + actual, cmd[0], cmd[1], cmd[2], cmd[3], chunk_len);
#endif

		ret = spi_flash_cmd(flash->spi, CMD_S25FLXX_WREN, NULL, 0);
		if (ret < 0) {
			printk(BIOS_WARNING, "SF: Enabling Write failed\n");
			break;
		}

		ret = spi_flash_cmd_write(flash->spi, cmd, 4,
					  buf + actual, chunk_len);
		if (ret < 0) {
			printk(BIOS_WARNING, "SF: SPANSION Page Program failed\n");
			break;
		}

		ret = spi_flash_cmd_wait_ready(flash, SPI_FLASH_PROG_TIMEOUT);
		if (ret)
			break;

		page_addr++;
		byte_addr = 0;
	}

#if CONFIG_DEBUG_SPI_FLASH
	printk(BIOS_SPEW, "SF: SPANSION: Successfully programmed %zu bytes @ 0x%x\n",
	      len, offset);
#endif

	return ret;
}

static struct spansion_spi_flash spsn_flash;

struct spi_flash *spi_flash_probe_spansion(struct spi_slave *spi, u8 *idcode)
{
	const struct spansion_spi_flash_params *params;
	struct spansion_spi_flash *spsn;
	unsigned int i;

	for (i = 0; i < ARRAY_SIZE(spansion_spi_flash_table); i++) {
		params = &spansion_spi_flash_table[i];
		if (params->identify(params, idcode))
			break;
	}

	if (i == ARRAY_SIZE(spansion_spi_flash_table)) {
		printk(BIOS_WARNING,
		       "SF: Unsupported SPANSION ID %02x %02x %02x %02x %02x\n",
		       idcode[0], idcode[1], idcode[2], idcode[3], idcode[4]);
		return NULL;
	}

	spsn = &spsn_flash;

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

	spsn->flash.write = spansion_write;
	spsn->flash.erase = spi_flash_cmd_erase;
	spsn->flash.read = spi_flash_cmd_read_slow;
	spsn->flash.status = spi_flash_cmd_status;
	spsn->flash.sector_size = params->page_size * params->pages_per_sector;
	spsn->flash.size = spsn->flash.sector_size * params->nr_sectors;
	spsn->flash.erase_cmd = CMD_S25FLXX_SE;
	spsn->flash.status_cmd = CMD_S25FLXX_RDSR;

	return &spsn->flash;
}