1 files changed, 334 insertions, 0 deletions
diff --git a/drivers/mtd/spi/winbond.c b/drivers/mtd/spi/winbond.c
new file mode 100644
index 00000000000..5fa4ce056f1
--- /dev/null
+++ b/drivers/mtd/spi/winbond.c
@@ -0,0 +1,334 @@
+/*
+ * (C) Copyright 2000-2002
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * Copyright 2008, Texas Instrumemnts Inc.
+ * Modified to suppport Winbond flash.
+ *
+ * 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"
+
+/* W25 specific commands. Derived from section 12.2 of 
+ * http://www.winbond-usa.com/products/Nexflash/pdfs/datasheets/W25X16_32_64h.pdf 
+ */
+#define CMD_W25_WREN		0x06	/* Write Enable */
+#define CMD_W25_WRDI		0x04	/* Write Disable */
+#define CMD_W25_RDSR		0x05	/* Read Status Register */
+#define CMD_W25_WRSR		0x01	/* Write Status Register */
+#define CMD_W25_READ		0x03	/* Read Data Bytes */
+#define CMD_W25_FAST_READ	0x0b	/* Read Data Bytes at Higher Speed */
+#define CMD_W25_PP		0x02	/* Page Program */
+#define CMD_W25_SE		0x20	/* Sector Erase */
+#define CMD_W25_BE		0xd8	/* Bulk Erase */
+#define CMD_W25_DP		0xb9	/* Deep Power-down */
+#define CMD_W25_RES		0xab	/* Release from DP, and Read Signature */
+
+#define WINBOND_ID_W25X16	      0x3015
+#define WINBOND_ID_W25X32	      0x3016
+#define WINBOND_ID_W25X64	      0x3017
+
+#define WINBOND_SR_WIP		(1 << 0)	/* Write-in-Progress */
+
+struct winbond_spi_flash_params {
+	u16 idcode;
+	u16 page_size;
+	u16 pages_per_sector;
+	u16 nr_sectors;
+	const char *name;
+};
+
+struct winbond_spi_flash {
+	const struct winbond_spi_flash_params *params;
+	struct spi_flash flash;
+};
+
+static inline struct winbond_spi_flash *to_winbond_spi_flash(struct spi_flash
+							     *flash)
+{
+	return container_of(flash, struct winbond_spi_flash, flash);
+}
+
+/* W25 specific flash parameters. Derived from chapter 1 of
+ * http://www.winbond-usa.com/products/Nexflash/pdfs/datasheets/W25X16_32_64h.pdf 
+ */
+static const struct winbond_spi_flash_params winbond_spi_flash_table[] = {
+	{
+		.idcode = WINBOND_ID_W25X32,
+		.page_size = 256,
+		.pages_per_sector = 16,
+		.nr_sectors = 1024,
+		.name = "W25X32",
+	},
+	{
+		.idcode = WINBOND_ID_W25X16,
+		.page_size = 256,
+		.pages_per_sector = 16,
+		.nr_sectors = 512,
+		.name = "W25X16",
+	},
+	{
+		.idcode = WINBOND_ID_W25X64,
+		.page_size = 256,
+		.pages_per_sector = 16,
+		.nr_sectors = 2048,
+		.name = "W25X64",
+	},
+	
+};
+
+static int winbond_wait_ready(struct spi_flash *flash, unsigned long timeout)
+{
+	struct spi_slave *spi = flash->spi;
+	unsigned long timebase;
+	int ret;
+	u8 status;
+	u8 cmd[4] = { CMD_W25_RDSR, 0xff, 0xff, 0xff };
+
+	ret = spi_xfer(spi, 32, &cmd[0], NULL, SPI_XFER_BEGIN);
+	if (ret) {
+		debug("SF: Failed to send command %02x: %d\n", cmd, ret);
+		return ret;
+	}
+
+	timebase = get_timer(0);
+	do {
+		ret = spi_xfer(spi, 8, NULL, &status, 0);
+		if (ret)
+			return -1;
+
+		if ((status & WINBOND_SR_WIP) == 0)
+			break;
+
+	} while (get_timer(timebase) < timeout);
+
+	spi_xfer(spi, 0, NULL, NULL, SPI_XFER_END);
+
+	if ((status & WINBOND_SR_WIP) == 0)
+		return 0;
+
+	/* Timed out */
+	return -1;
+}
+
+static int winbond_read_fast(struct spi_flash *flash,
+			     u32 offset, size_t len, void *buf)
+{
+	struct winbond_spi_flash *win = to_winbond_spi_flash(flash);
+	u8 cmd[5];
+	int i, j;
+
+	cmd[0] = CMD_READ_ARRAY_FAST;
+	for (i = 0, j = 1; i < 24; i += 8)
+		cmd[j++] = ((offset >> (16 - i)) & 0xFF);
+	cmd[4] = 0x00;
+
+	return spi_flash_read_common(flash, cmd, sizeof(cmd), buf, len);
+}
+
+static int winbond_write(struct spi_flash *flash,
+			 u32 offset, size_t len, const void *buf)
+{
+	struct winbond_spi_flash *win = to_winbond_spi_flash(flash);
+	unsigned long page_addr;
+	unsigned long byte_addr;
+	unsigned long page_size;
+	size_t chunk_len;
+	size_t actual;
+	int ret, i, j;
+	u8 cmd[4];
+
+	page_size = win->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_W25_PP;
+		for (i = 0, j = 1; i < 24; i += 8)
+		    cmd[j++] = ((offset >> (16 - i)) & 0xFF);
+
+		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_W25_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: Winbond Page Program failed\n");
+			break;
+		}
+
+		ret = winbond_wait_ready(flash, SPI_FLASH_PROG_TIMEOUT);
+		if (ret < 0) {
+			debug("SF: Winbond page programming timed out\n");
+			break;
+		}
+
+		page_addr++;
+		offset += chunk_len;
+		byte_addr = 0;
+	}
+
+	debug("SF: Winbond: Successfully programmed %u bytes @ 0x%x\n",
+	      len, offset);
+
+	spi_release_bus(flash->spi);
+	return ret;
+}
+
+int winbond_erase(struct spi_flash *flash, u32 offset, size_t len)
+{
+	struct winbond_spi_flash *win = to_winbond_spi_flash(flash);
+	unsigned long sector_size;
+	size_t actual;
+	int ret, i , j;
+	u8 cmd[4];
+
+	/*
+	 * This function currently uses sector erase only.
+	 * probably speed things up by using bulk erase
+	 * when possible.
+	 */
+
+	sector_size = win->params->page_size * win->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_W25_SE;
+
+	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++) {
+
+		for (i = 0, j = 1; i < 24; i += 8)
+		    cmd[j++] = ((offset >> (16 - i)) & 0xFF);
+
+		debug
+		    ("SE: cmd = { 0x%02x 0x%02x%02x%02x }\n",
+		     cmd[0], cmd[1], cmd[2], cmd[3]);
+
+		ret = spi_flash_cmd(flash->spi, CMD_W25_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: Winbond page erase failed\n");
+			break;
+		}
+
+		/* Up to 2 seconds */
+		ret = winbond_wait_ready(flash, 2 * CFG_HZ);
+		if (ret < 0) {
+			debug("SF: Winbond page erase timed out\n");
+			break;
+		}
+
+		offset += sector_size;
+	}
+
+	debug("SF: Winbond: Successfully erased %u bytes @ 0x%x\n",
+	      len * sector_size, offset);
+
+	spi_release_bus(flash->spi);
+	return ret;
+}
+
+struct spi_flash *spi_flash_probe_winbond(struct spi_slave *spi, u8 * idcode)
+{
+	const struct winbond_spi_flash_params *params;
+	struct winbond_spi_flash *win;
+	unsigned int i;
+	int ret;
+	u8 id[3];
+	u16 idmatch = ((idcode[1] << 8) | idcode[2]);
+
+	ret = spi_flash_cmd(spi, CMD_READ_ID, id, sizeof(id));
+	if (ret)
+		return NULL;
+
+	for (i = 0; i < ARRAY_SIZE(winbond_spi_flash_table); i++) {
+		params = &winbond_spi_flash_table[i];
+	       if (params->idcode == idmatch)
+		       break;
+	}
+
+	if (i == ARRAY_SIZE(winbond_spi_flash_table)) {
+		debug("SF: Unsupported Winbond ID %02x\n", idmatch);
+		return NULL;
+	}
+
+	win = malloc(sizeof(struct winbond_spi_flash));
+	if (!win) {
+		debug("SF: Failed to allocate memory\n");
+		return NULL;
+	}
+
+	win->params = params;
+	win->flash.spi = spi;
+	win->flash.name = params->name;
+
+	win->flash.write = winbond_write;
+	win->flash.erase = winbond_erase;
+	win->flash.read = winbond_read_fast;
+	win->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, win->flash.size);
+
+	return &win->flash;
+}