Merge branch 'sf' of git://git.denx.de/u-boot-blackfin

7 files changed, 780 insertions, 20 deletions

diff --git a/drivers/mtd/spi/Makefile b/drivers/mtd/spi/Makefile
index 3d4f892..a71b16e 100644
--- a/drivers/mtd/spi/Makefile
+++ b/drivers/mtd/spi/Makefile
@@ -27,6 +27,8 @@ 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_SST)	+= sst.o
 COBJS-$(CONFIG_SPI_FLASH_STMICRO)	+= stmicro.o
 
 COBJS	:= $(COBJS-y)
diff --git a/drivers/mtd/spi/atmel.c b/drivers/mtd/spi/atmel.c
index a5f51ca..c3b936f 100644
--- a/drivers/mtd/spi/atmel.c
+++ b/drivers/mtd/spi/atmel.c
@@ -3,7 +3,7 @@
  *
  * Copyright (C) 2008 Atmel Corporation
  */
-#define DEBUG
+
 #include <common.h>
 #include <malloc.h>
 #include <spi_flash.h>
@@ -53,6 +53,54 @@ to_atmel_spi_flash(struct spi_flash *flash)
 
 static const struct atmel_spi_flash_params atmel_spi_flash_table[] = {
 	{
+		.idcode1		= 0x22,
+		.l2_page_size		= 8,
+		.pages_per_block	= 8,
+		.blocks_per_sector	= 16,
+		.nr_sectors		= 4,
+		.name			= "AT45DB011D",
+	},
+	{
+		.idcode1		= 0x23,
+		.l2_page_size		= 8,
+		.pages_per_block	= 8,
+		.blocks_per_sector	= 16,
+		.nr_sectors		= 8,
+		.name			= "AT45DB021D",
+	},
+	{
+		.idcode1		= 0x24,
+		.l2_page_size		= 8,
+		.pages_per_block	= 8,
+		.blocks_per_sector	= 32,
+		.nr_sectors		= 8,
+		.name			= "AT45DB041D",
+	},
+	{
+		.idcode1		= 0x25,
+		.l2_page_size		= 8,
+		.pages_per_block	= 8,
+		.blocks_per_sector	= 32,
+		.nr_sectors		= 16,
+		.name			= "AT45DB081D",
+	},
+	{
+		.idcode1		= 0x26,
+		.l2_page_size		= 9,
+		.pages_per_block	= 8,
+		.blocks_per_sector	= 32,
+		.nr_sectors		= 16,
+		.name			= "AT45DB161D",
+	},
+	{
+		.idcode1		= 0x27,
+		.l2_page_size		= 9,
+		.pages_per_block	= 8,
+		.blocks_per_sector	= 64,
+		.nr_sectors		= 64,
+		.name			= "AT45DB321D",
+	},
+	{
 		.idcode1		= 0x28,
 		.l2_page_size		= 10,
 		.pages_per_block	= 8,
diff --git a/drivers/mtd/spi/spansion.c b/drivers/mtd/spi/spansion.c
new file mode 100644
index 0000000..fdb7917
--- /dev/null
+++ b/drivers/mtd/spi/spansion.c
@@ -0,0 +1,350 @@
+/*
+ * 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;
+
+	jedec = idcode[1] << 8 | idcode[2];
+	ext_jedec = idcode[3] << 8 | idcode[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;
+}
diff --git a/drivers/mtd/spi/spi_flash.c b/drivers/mtd/spi/spi_flash.c
index d1d81af..274895a 100644
--- a/drivers/mtd/spi/spi_flash.c
+++ b/drivers/mtd/spi/spi_flash.c
@@ -3,7 +3,7 @@
  *
  * Copyright (C) 2008 Atmel Corporation
  */
-#define DEBUG
+
 #include <common.h>
 #include <malloc.h>
 #include <spi.h>
@@ -101,7 +101,7 @@ struct spi_flash *spi_flash_probe(unsigned int bus, unsigned int cs,
 	struct spi_slave *spi;
 	struct spi_flash *flash;
 	int ret;
-	u8 idcode[3];
+	u8 idcode[5];
 
 	spi = spi_setup_slave(bus, cs, max_hz, spi_mode);
 	if (!spi) {
@@ -120,8 +120,8 @@ struct spi_flash *spi_flash_probe(unsigned int bus, unsigned int cs,
 	if (ret)
 		goto err_read_id;
 
-	debug("SF: Got idcode %02x %02x %02x\n", idcode[0],
-			idcode[1], idcode[2]);
+	debug("SF: Got idcode %02x %02x %02x %02x %02x\n", idcode[0],
+			idcode[1], idcode[2], idcode[3], idcode[4]);
 
 	switch (idcode[0]) {
 #ifdef CONFIG_SPI_FLASH_SPANSION
@@ -139,6 +139,11 @@ struct spi_flash *spi_flash_probe(unsigned int bus, unsigned int cs,
 		flash = spi_flash_probe_stmicro(spi, idcode);
 		break;
 #endif
+#ifdef CONFIG_SPI_FLASH_SST
+	case 0xBF:
+		flash = spi_flash_probe_sst(spi, idcode);
+		break;
+#endif
 	default:
 		debug("SF: Unsupported manufacturer %02X\n", idcode[0]);
 		flash = NULL;
diff --git a/drivers/mtd/spi/spi_flash_internal.h b/drivers/mtd/spi/spi_flash_internal.h
index 75f5900..5d1e395 100644
--- a/drivers/mtd/spi/spi_flash_internal.h
+++ b/drivers/mtd/spi/spi_flash_internal.h
@@ -4,9 +4,12 @@
  * Copyright (C) 2008 Atmel Corporation
  */
 
-/* Common parameters */
-#define SPI_FLASH_PROG_TIMEOUT		((10 * CONFIG_SYS_HZ) / 1000)
-#define SPI_FLASH_PAGE_ERASE_TIMEOUT	((50 * CONFIG_SYS_HZ) / 1000)
+/* Common parameters -- kind of high, but they should only occur when there
+ * is a problem (and well your system already is broken), so err on the side
+ * of caution in case we're dealing with slower SPI buses and/or processors.
+ */
+#define SPI_FLASH_PROG_TIMEOUT		(2 * CONFIG_SYS_HZ)
+#define SPI_FLASH_PAGE_ERASE_TIMEOUT	(5 * CONFIG_SYS_HZ)
 #define SPI_FLASH_SECTOR_ERASE_TIMEOUT	(10 * CONFIG_SYS_HZ)
 
 /* Common commands */
@@ -43,4 +46,5 @@ int spi_flash_read_common(struct spi_flash *flash, const u8 *cmd,
 /* Manufacturer-specific probe functions */
 struct spi_flash *spi_flash_probe_spansion(struct spi_slave *spi, u8 *idcode);
 struct spi_flash *spi_flash_probe_atmel(struct spi_slave *spi, u8 *idcode);
+struct spi_flash *spi_flash_probe_sst(struct spi_slave *spi, u8 *idcode);
 struct spi_flash *spi_flash_probe_stmicro(struct spi_slave *spi, u8 *idcode);
diff --git a/drivers/mtd/spi/sst.c b/drivers/mtd/spi/sst.c
new file mode 100644
index 0000000..62236d4
--- /dev/null
+++ b/drivers/mtd/spi/sst.c
@@ -0,0 +1,358 @@
+/*
+ * Driver for SST serial flashes
+ *
+ * (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)
+ * Copyright (c) 2008-2009 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <common.h>
+#include <malloc.h>
+#include <spi_flash.h>
+
+#include "spi_flash_internal.h"
+
+#define CMD_SST_WREN		0x06	/* Write Enable */
+#define CMD_SST_WRDI		0x04	/* Write Disable */
+#define CMD_SST_RDSR		0x05	/* Read Status Register */
+#define CMD_SST_WRSR		0x01	/* Write Status Register */
+#define CMD_SST_READ		0x03	/* Read Data Bytes */
+#define CMD_SST_FAST_READ	0x0b	/* Read Data Bytes at Higher Speed */
+#define CMD_SST_BP		0x02	/* Byte Program */
+#define CMD_SST_AAI_WP		0xAD	/* Auto Address Increment Word Program */
+#define CMD_SST_SE		0x20	/* Sector Erase */
+
+#define SST_SR_WIP		(1 << 0)	/* Write-in-Progress */
+#define SST_SR_WEL		(1 << 1)	/* Write enable */
+#define SST_SR_BP0		(1 << 2)	/* Block Protection 0 */
+#define SST_SR_BP1		(1 << 3)	/* Block Protection 1 */
+#define SST_SR_BP2		(1 << 4)	/* Block Protection 2 */
+#define SST_SR_AAI		(1 << 6)	/* Addressing mode */
+#define SST_SR_BPL		(1 << 7)	/* BP bits lock */
+
+struct sst_spi_flash_params {
+	u8 idcode1;
+	u16 nr_sectors;
+	const char *name;
+};
+
+struct sst_spi_flash {
+	struct spi_flash flash;
+	const struct sst_spi_flash_params *params;
+};
+
+static inline struct sst_spi_flash *to_sst_spi_flash(struct spi_flash *flash)
+{
+	return container_of(flash, struct sst_spi_flash, flash);
+}
+
+#define SST_SECTOR_SIZE (4 * 1024)
+static const struct sst_spi_flash_params sst_spi_flash_table[] = {
+	{
+		.idcode1 = 0x01,
+		.nr_sectors = 128,
+		.name = "SST25WF512",
+	},{
+		.idcode1 = 0x02,
+		.nr_sectors = 256,
+		.name = "SST25WF010",
+	},{
+		.idcode1 = 0x03,
+		.nr_sectors = 512,
+		.name = "SST25WF020",
+	},{
+		.idcode1 = 0x04,
+		.nr_sectors = 1024,
+		.name = "SST25WF040",
+	},
+};
+
+static int
+sst_wait_ready(struct spi_flash *flash, unsigned long timeout)
+{
+	struct spi_slave *spi = flash->spi;
+	unsigned long timebase;
+	int ret;
+	u8 byte = CMD_SST_RDSR;
+
+	ret = spi_xfer(spi, sizeof(byte) * 8, &byte, NULL, SPI_XFER_BEGIN);
+	if (ret) {
+		debug("SF: Failed to send command %02x: %d\n", byte, ret);
+		return ret;
+	}
+
+	timebase = get_timer(0);
+	do {
+		ret = spi_xfer(spi, sizeof(byte) * 8, NULL, &byte, 0);
+		if (ret)
+			break;
+
+		if ((byte & SST_SR_WIP) == 0)
+			break;
+
+	} while (get_timer(timebase) < timeout);
+
+	spi_xfer(spi, 0, NULL, NULL, SPI_XFER_END);
+
+	if (!ret && (byte & SST_SR_WIP) != 0)
+		ret = -1;
+
+	if (ret)
+		debug("SF: sst wait for ready timed out\n");
+	return ret;
+}
+
+static int
+sst_enable_writing(struct spi_flash *flash)
+{
+	int ret = spi_flash_cmd(flash->spi, CMD_SST_WREN, NULL, 0);
+	if (ret)
+		debug("SF: Enabling Write failed\n");
+	return ret;
+}
+
+static int
+sst_disable_writing(struct spi_flash *flash)
+{
+	int ret = spi_flash_cmd(flash->spi, CMD_SST_WRDI, NULL, 0);
+	if (ret)
+		debug("SF: Disabling Write failed\n");
+	return ret;
+}
+
+static int
+sst_read_fast(struct spi_flash *flash, u32 offset, size_t len, void *buf)
+{
+	u8 cmd[5] = {
+		CMD_READ_ARRAY_FAST,
+		offset >> 16,
+		offset >> 8,
+		offset,
+		0x00,
+	};
+	return spi_flash_read_common(flash, cmd, sizeof(cmd), buf, len);
+}
+
+static int
+sst_byte_write(struct spi_flash *flash, u32 offset, const void *buf)
+{
+	int ret;
+	u8 cmd[4] = {
+		CMD_SST_BP,
+		offset >> 16,
+		offset >> 8,
+		offset,
+	};
+
+	debug("BP[%02x]: 0x%p => cmd = { 0x%02x 0x%06x }\n",
+		spi_w8r8(flash->spi, CMD_SST_RDSR), buf, cmd[0], offset);
+
+	ret = sst_enable_writing(flash);
+	if (ret)
+		return ret;
+
+	ret = spi_flash_cmd_write(flash->spi, cmd, sizeof(cmd), buf, 1);
+	if (ret)
+		return ret;
+
+	return sst_wait_ready(flash, SPI_FLASH_PROG_TIMEOUT);
+}
+
+static int
+sst_write(struct spi_flash *flash, u32 offset, size_t len, const void *buf)
+{
+	size_t actual, cmd_len;
+	int ret;
+	u8 cmd[4];
+
+	ret = spi_claim_bus(flash->spi);
+	if (ret) {
+		debug("SF: Unable to claim SPI bus\n");
+		return ret;
+	}
+
+	/* If the data is not word aligned, write out leading single byte */
+	actual = offset % 2;
+	if (actual) {
+		ret = sst_byte_write(flash, offset, buf);
+		if (ret)
+			goto done;
+	}
+	offset += actual;
+
+	ret = sst_enable_writing(flash);
+	if (ret)
+		goto done;
+
+	cmd_len = 4;
+	cmd[0] = CMD_SST_AAI_WP;
+	cmd[1] = offset >> 16;
+	cmd[2] = offset >> 8;
+	cmd[3] = offset;
+
+	for (; actual < len - 1; actual += 2) {
+		debug("WP[%02x]: 0x%p => cmd = { 0x%02x 0x%06x }\n",
+		     spi_w8r8(flash->spi, CMD_SST_RDSR), buf + actual, cmd[0],
+		     offset);
+
+		ret = spi_flash_cmd_write(flash->spi, cmd, cmd_len,
+		                          buf + actual, 2);
+		if (ret) {
+			debug("SF: sst word program failed\n");
+			break;
+		}
+
+		ret = sst_wait_ready(flash, SPI_FLASH_PROG_TIMEOUT);
+		if (ret)
+			break;
+
+		cmd_len = 1;
+		offset += 2;
+	}
+
+	if (!ret)
+		ret = sst_disable_writing(flash);
+
+	/* If there is a single trailing byte, write it out */
+	if (!ret && actual != len)
+		ret = sst_byte_write(flash, offset, buf + actual);
+
+ done:
+	debug("SF: sst: program %s %zu bytes @ 0x%zx\n",
+	      ret ? "failure" : "success", len, offset - actual);
+
+	spi_release_bus(flash->spi);
+	return ret;
+}
+
+int
+sst_erase(struct spi_flash *flash, u32 offset, size_t len)
+{
+	unsigned long sector_size;
+	u32 start, end;
+	int ret;
+	u8 cmd[4];
+
+	/*
+	 * This function currently uses sector erase only.
+	 * Probably speed things up by using bulk erase
+	 * when possible.
+	 */
+
+	sector_size = SST_SECTOR_SIZE;
+
+	if (offset % sector_size) {
+		debug("SF: Erase offset not multiple of sector size\n");
+		return -1;
+	}
+
+	ret = spi_claim_bus(flash->spi);
+	if (ret) {
+		debug("SF: Unable to claim SPI bus\n");
+		return ret;
+	}
+
+	cmd[0] = CMD_SST_SE;
+	cmd[3] = 0;
+	start = offset;
+	end = start + len;
+
+	ret = 0;
+	while (offset < end) {
+		cmd[1] = offset >> 16;
+		cmd[2] = offset >> 8;
+		offset += sector_size;
+
+		debug("SF: erase %2x %2x %2x %2x (%x)\n", cmd[0], cmd[1],
+		      cmd[2], cmd[3], offset);
+
+		ret = sst_enable_writing(flash);
+		if (ret)
+			break;
+
+		ret = spi_flash_cmd_write(flash->spi, cmd, sizeof(cmd), NULL, 0);
+		if (ret) {
+			debug("SF: sst page erase failed\n");
+			break;
+		}
+
+		ret = sst_wait_ready(flash, SPI_FLASH_PAGE_ERASE_TIMEOUT);
+		if (ret)
+			break;
+	}
+
+	debug("SF: sst: Successfully erased %lu bytes @ 0x%x\n",
+	      len * sector_size, start);
+
+	spi_release_bus(flash->spi);
+	return ret;
+}
+
+static int
+sst_unlock(struct spi_flash *flash)
+{
+	int ret;
+	u8 cmd, status;
+
+	ret = sst_enable_writing(flash);
+	if (ret)
+		return ret;
+
+	cmd = CMD_SST_WRSR;
+	status = 0;
+	ret = spi_flash_cmd_write(flash->spi, &cmd, 1, &status, 1);
+	if (ret)
+		debug("SF: Unable to set status byte\n");
+
+	debug("SF: sst: status = %x\n", spi_w8r8(flash->spi, CMD_SST_RDSR));
+
+	return ret;
+}
+
+struct spi_flash *
+spi_flash_probe_sst(struct spi_slave *spi, u8 *idcode)
+{
+	const struct sst_spi_flash_params *params;
+	struct sst_spi_flash *stm;
+	size_t i;
+
+	for (i = 0; i < ARRAY_SIZE(sst_spi_flash_table); ++i) {
+		params = &sst_spi_flash_table[i];
+		if (params->idcode1 == idcode[2])
+			break;
+	}
+
+	if (i == ARRAY_SIZE(sst_spi_flash_table)) {
+		debug("SF: Unsupported SST ID %02x\n", idcode[1]);
+		return NULL;
+	}
+
+	stm = malloc(sizeof(*stm));
+	if (!stm) {
+		debug("SF: Failed to allocate memory\n");
+		return NULL;
+	}
+
+	stm->params = params;
+	stm->flash.spi = spi;
+	stm->flash.name = params->name;
+
+	stm->flash.write = sst_write;
+	stm->flash.erase = sst_erase;
+	stm->flash.read = sst_read_fast;
+	stm->flash.size = SST_SECTOR_SIZE * params->nr_sectors;
+
+	debug("SF: Detected %s with page size %u, total %u bytes\n",
+	      params->name, SST_SECTOR_SIZE, stm->flash.size);
+
+	/* Flash powers up read-only, so clear BP# bits */
+	sst_unlock(&stm->flash);
+
+	return &stm->flash;
+}
diff --git a/drivers/mtd/spi/stmicro.c b/drivers/mtd/spi/stmicro.c
index e7dda91..9b910c1 100644
--- a/drivers/mtd/spi/stmicro.c
+++ b/drivers/mtd/spi/stmicro.c
@@ -133,12 +133,12 @@ static int stmicro_wait_ready(struct spi_flash *flash, unsigned long timeout)
 	struct spi_slave *spi = flash->spi;
 	unsigned long timebase;
 	int ret;
+	u8 cmd = CMD_M25PXX_RDSR;
 	u8 status;
-	u8 cmd[4] = { CMD_M25PXX_RDSR, 0xff, 0xff, 0xff };
 
-	ret = spi_xfer(spi, 32, &cmd[0], NULL, SPI_XFER_BEGIN);
+	ret = spi_xfer(spi, 8, &cmd, NULL, SPI_XFER_BEGIN);
 	if (ret) {
-		debug("SF: Failed to send command %02x: %d\n", cmd[0], ret);
+		debug("SF: Failed to send command %02x: %d\n", cmd, ret);
 		return ret;
 	}
 
@@ -295,8 +295,7 @@ int stmicro_erase(struct spi_flash *flash, u32 offset, size_t len)
 			break;
 		}
 
-		/* Up to 2 seconds */
-		ret = stmicro_wait_ready(flash, 2 * CONFIG_SYS_HZ);
+		ret = stmicro_wait_ready(flash, SPI_FLASH_PAGE_ERASE_TIMEOUT);
 		if (ret < 0) {
 			debug("SF: STMicro page erase timed out\n");
 			break;
@@ -315,12 +314,6 @@ struct spi_flash *spi_flash_probe_stmicro(struct spi_slave *spi, u8 * idcode)
 	const struct stmicro_spi_flash_params *params;
 	struct stmicro_spi_flash *stm;
 	unsigned int i;
-	int ret;
-	u8 id[3];
-
-	ret = spi_flash_cmd(spi, CMD_READ_ID, id, sizeof(id));
-	if (ret)
-		return NULL;
 
 	for (i = 0; i < ARRAY_SIZE(stmicro_spi_flash_table); i++) {
 		params = &stmicro_spi_flash_table[i];
@@ -330,7 +323,7 @@ struct spi_flash *spi_flash_probe_stmicro(struct spi_slave *spi, u8 * idcode)
 	}
 
 	if (i == ARRAY_SIZE(stmicro_spi_flash_table)) {
-		debug("SF: Unsupported STMicro ID %02x\n", id[1]);
+		debug("SF: Unsupported STMicro ID %02x\n", idcode[1]);
 		return NULL;
 	}