mtd: SPI Flash: Support the Spansion Flash

Add MTD SPI Flash support for S25FL008A, S25FL016A,
S25FL032A, S25FL064A, S25FL128P.

Signed-off-by: Mingkai Hu <Mingkai.hu@freescale.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>

drivers/mtd/spi/Makefile

@@ -27,6 +27,7 @@ LIB	:= $(obj)libspi_flash.a
 
 COBJS-$(CONFIG_SPI_FLASH)	+= spi_flash.o
 COBJS-$(CONFIG_SPI_FLASH_ATMEL)	+= atmel.o
+COBJS-$(CONFIG_SPI_FLASH_SPANSION)	+= spansion.o
 COBJS-$(CONFIG_SPI_FLASH_STMICRO)	+= stmicro.o
 
 COBJS	:= $(COBJS-y)

drivers/mtd/spi/spansion.c

+/*
+ * 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)
+ *
+ * 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"
+
+/* 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_ID_S25FL008A	0x0213
+#define SPSN_ID_S25FL016A	0x0214
+#define SPSN_ID_S25FL032A	0x0215
+#define SPSN_ID_S25FL064A	0x0216
+#define SPSN_ID_S25FL128P	0x2018
+#define SPSN_EXT_ID_S25FL128P_256KB	0x0300
+#define SPSN_EXT_ID_S25FL128P_64KB	0x0301
+
+#define SPANSION_SR_WIP		(1 << 0)	/* Write-in-Progress */
+
+struct spansion_spi_flash_params {
+	u16 idcode1;
+	u16 idcode2;
+	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);
+}
+
+static const struct spansion_spi_flash_params spansion_spi_flash_table[] = {
+	{
+		.idcode1 = SPSN_ID_S25FL008A,
+		.idcode2 = 0,
+		.page_size = 256,
+		.pages_per_sector = 256,
+		.nr_sectors = 16,
+		.name = "S25FL008A",
+	},
+	{
+		.idcode1 = SPSN_ID_S25FL016A,
+		.idcode2 = 0,
+		.page_size = 256,
+		.pages_per_sector = 256,
+		.nr_sectors = 32,
+		.name = "S25FL016A",
+	},
+	{
+		.idcode1 = SPSN_ID_S25FL032A,
+		.idcode2 = 0,
+		.page_size = 256,
+		.pages_per_sector = 256,
+		.nr_sectors = 64,
+		.name = "S25FL032A",
+	},
+	{
+		.idcode1 = SPSN_ID_S25FL064A,
+		.idcode2 = 0,
+		.page_size = 256,
+		.pages_per_sector = 256,
+		.nr_sectors = 128,
+		.name = "S25FL064A",
+	},
+	{
+		.idcode1 = SPSN_ID_S25FL128P,
+		.idcode2 = SPSN_EXT_ID_S25FL128P_64KB,
+		.page_size = 256,
+		.pages_per_sector = 256,
+		.nr_sectors = 256,
+		.name = "S25FL128P_64K",
+	},
+	{
+		.idcode1 = SPSN_ID_S25FL128P,
+		.idcode2 = SPSN_EXT_ID_S25FL128P_256KB,
+		.page_size = 256,
+		.pages_per_sector = 1024,
+		.nr_sectors = 64,
+		.name = "S25FL128P_256K",
+	},
+};
+
+static int spansion_wait_ready(struct spi_flash *flash, unsigned long timeout)
+{
+	struct spi_slave *spi = flash->spi;
+	unsigned long timebase;
+	int ret;
+	u8 status;
+
+	timebase = get_timer(0);
+	do {
+		ret = spi_flash_cmd(spi, CMD_S25FLXX_RDSR, &status, sizeof(status));
+		if (ret)
+			return -1;
+
+		if ((status & SPANSION_SR_WIP) == 0)
+			break;
+
+	} while (get_timer(timebase) < timeout);
+
+
+	if ((status & SPANSION_SR_WIP) == 0)
+		return 0;
+
+	/* Timed out */
+	return -1;
+}
+
+static int spansion_read_fast(struct spi_flash *flash,
+			     u32 offset, size_t len, void *buf)
+{
+	struct spansion_spi_flash *spsn = to_spansion_spi_flash(flash);
+	unsigned long page_addr;
+	unsigned long page_size;
+	u8 cmd[5];
+
+	page_size = spsn->params->page_size;
+	page_addr = offset / page_size;
+
+	cmd[0] = CMD_READ_ARRAY_FAST;
+	cmd[1] = page_addr >> 8;
+	cmd[2] = page_addr;
+	cmd[3] = offset % page_size;
+	cmd[4] = 0x00;
+
+	debug
+		("READ: 0x%x => cmd = { 0x%02x 0x%02x%02x%02x%02x } len = 0x%x\n",
+		 offset, cmd[0], cmd[1], cmd[2], cmd[3], cmd[4], len);
+
+	return spi_flash_read_common(flash, cmd, sizeof(cmd), buf, len);
+}
+
+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;
+	u8 cmd[4];
+
+	page_size = spsn->params->page_size;
+	page_addr = offset / page_size;
+	byte_addr = offset % page_size;
+
+	ret = spi_claim_bus(flash->spi);
+	if (ret) {
+		debug("SF: Unable to claim SPI bus\n");
+		return ret;
+	}
+
+	ret = 0;
+	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;
+
+		debug
+		    ("PP: 0x%p => cmd = { 0x%02x 0x%02x%02x%02x } chunk_len = %d\n",
+		     buf + actual, cmd[0], cmd[1], cmd[2], cmd[3], chunk_len);
+
+		ret = spi_flash_cmd(flash->spi, CMD_S25FLXX_WREN, NULL, 0);
+		if (ret < 0) {
+			debug("SF: Enabling Write failed\n");
+			break;
+		}
+
+		ret = spi_flash_cmd_write(flash->spi, cmd, 4,
+					  buf + actual, chunk_len);
+		if (ret < 0) {
+			debug("SF: SPANSION Page Program failed\n");
+			break;
+		}
+
+		ret = spansion_wait_ready(flash, SPI_FLASH_PROG_TIMEOUT);
+		if (ret < 0) {
+			debug("SF: SPANSION page programming timed out\n");
+			break;
+		}
+
+		page_addr++;
+		byte_addr = 0;
+	}
+
+	debug("SF: SPANSION: Successfully programmed %u bytes @ 0x%x\n",
+	      len, offset);
+
+	spi_release_bus(flash->spi);
+	return ret;
+}
+
+int spansion_erase(struct spi_flash *flash, u32 offset, size_t len)
+{
+	struct spansion_spi_flash *spsn = to_spansion_spi_flash(flash);
+	unsigned long sector_size;
+	size_t actual;
+	int ret;
+	u8 cmd[4];
+
+	/*
+	 * This function currently uses sector erase only.
+	 * probably speed things up by using bulk erase
+	 * when possible.
+	 */
+
+	sector_size = spsn->params->page_size * spsn->params->pages_per_sector;
+
+	if (offset % sector_size || len % sector_size) {
+		debug("SF: Erase offset/length not multiple of sector size\n");
+		return -1;
+	}
+
+	len /= sector_size;
+	cmd[0] = CMD_S25FLXX_SE;
+	cmd[2] = 0x00;
+	cmd[3] = 0x00;
+
+	ret = spi_claim_bus(flash->spi);
+	if (ret) {
+		debug("SF: Unable to claim SPI bus\n");
+		return ret;
+	}
+
+	ret = 0;
+	for (actual = 0; actual < len; actual++) {
+		cmd[1] = (offset / sector_size) + actual;
+
+		ret = spi_flash_cmd(flash->spi, CMD_S25FLXX_WREN, NULL, 0);
+		if (ret < 0) {
+			debug("SF: Enabling Write failed\n");
+			break;
+		}
+
+		ret = spi_flash_cmd_write(flash->spi, cmd, 4, NULL, 0);
+		if (ret < 0) {
+			debug("SF: SPANSION page erase failed\n");
+			break;
+		}
+
+		/* Up to 2 seconds */
+		ret = spansion_wait_ready(flash, SPI_FLASH_PAGE_ERASE_TIMEOUT);
+		if (ret < 0) {
+			debug("SF: SPANSION page erase timed out\n");
+			break;
+		}
+	}
+
+	debug("SF: SPANSION: Successfully erased %u bytes @ 0x%x\n",
+	      len * sector_size, offset);
+
+	spi_release_bus(flash->spi);
+	return ret;
+}
+
+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;
+	unsigned short jedec, ext_jedec;
+	int ret;
+	u8 id[5] = {0};
+
+	ret = spi_flash_cmd(spi, CMD_READ_ID, id, sizeof(id));
+	if (ret)
+		return NULL;
+
+	jedec = id[1] << 8 | id[2];
+	ext_jedec = id[3] << 8 | id[4];
+
+	for (i = 0; i < ARRAY_SIZE(spansion_spi_flash_table); i++) {
+		params = &spansion_spi_flash_table[i];
+		if (params->idcode1 == jedec) {
+			if (params->idcode2 == ext_jedec)
+				break;
+		}
+	}
+
+	if (i == ARRAY_SIZE(spansion_spi_flash_table)) {
+		debug("SF: Unsupported SPANSION ID %04x %04x\n", jedec, ext_jedec);
+		return NULL;
+	}
+
+	spsn = malloc(sizeof(struct spansion_spi_flash));
+	if (!spsn) {
+		debug("SF: Failed to allocate memory\n");
+		return NULL;
+	}
+
+	spsn->params = params;
+	spsn->flash.spi = spi;
+	spsn->flash.name = params->name;
+
+	spsn->flash.write = spansion_write;
+	spsn->flash.erase = spansion_erase;
+	spsn->flash.read = spansion_read_fast;
+	spsn->flash.size = params->page_size * params->pages_per_sector
+	    * params->nr_sectors;
+
+	debug("SF: Detected %s with page size %u, total %u bytes\n",
+	      params->name, params->page_size, spsn->flash.size);
+
+	return &spsn->flash;
+}