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Diffstat (limited to 'drivers/mtd/spi/winbond.c')
-rw-r--r--drivers/mtd/spi/winbond.c334
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 0000000000..5fa4ce056f
--- /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;
+}
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