--- /dev/null
+/*
+ * Copyright 2008, Network Appliance Inc.
+ * Author: Jason McMullan <mcmullan <at> netapp.com>
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <common.h>
+#include <malloc.h>
+#include <spi_flash.h>
+
+#include "spi_flash_internal.h"
+
+/* M25Pxx-specific commands */
+#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 (4K) Erase */
+#define CMD_W25_BE 0xd8 /* Block (64K) Erase */
+#define CMD_W25_CE 0xc7 /* Chip 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 {
+ uint16_t id;
+ /* Log2 of page size in power-of-two mode */
+ uint8_t l2_page_size;
+ uint16_t pages_per_sector;
+ uint16_t sectors_per_block;
+ uint8_t nr_blocks;
+ const char *name;
+};
+
+/* spi_flash needs to be first so upper layers can free() it */
+struct winbond_spi_flash {
+ struct spi_flash flash;
+ const struct winbond_spi_flash_params *params;
+};
+
+static inline struct winbond_spi_flash *
+to_winbond_spi_flash(struct spi_flash *flash)
+{
+ return container_of(flash, struct winbond_spi_flash, flash);
+}
+
+static const struct winbond_spi_flash_params winbond_spi_flash_table[] = {
+ {
+ .id = WINBOND_ID_W25X16,
+ .l2_page_size = 8,
+ .pages_per_sector = 16,
+ .sectors_per_block = 16,
+ .nr_blocks = 32,
+ .name = "W25X16",
+ },
+ {
+ .id = WINBOND_ID_W25X32,
+ .l2_page_size = 8,
+ .pages_per_sector = 16,
+ .sectors_per_block = 16,
+ .nr_blocks = 64,
+ .name = "W25X32",
+ },
+ {
+ .id = WINBOND_ID_W25X64,
+ .l2_page_size = 8,
+ .pages_per_sector = 16,
+ .sectors_per_block = 16,
+ .nr_blocks = 128,
+ .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) {
+ debug("SF: Failed to get status for cmd %02x: %d\n", cmd, 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;
+
+ debug("SF: Timed out on command %02x: %d\n", cmd, ret);
+ /* Timed out */
+ return -1;
+}
+
+/*
+ * Assemble the address part of a command for Winbond devices in
+ * non-power-of-two page size mode.
+ */
+static void winbond_build_address(struct winbond_spi_flash *stm, u8 *cmd, u32 offset)
+{
+ unsigned long page_addr;
+ unsigned long byte_addr;
+ unsigned long page_size;
+ unsigned int page_shift;
+
+ /*
+ * The "extra" space per page is the power-of-two page size
+ * divided by 32.
+ */
+ page_shift = stm->params->l2_page_size;
+ page_size = (1 << page_shift);
+ page_addr = offset / page_size;
+ byte_addr = offset % page_size;
+
+ cmd[0] = page_addr >> (16 - page_shift);
+ cmd[1] = page_addr << (page_shift - 8) | (byte_addr >> 8);
+ cmd[2] = byte_addr;
+}
+
+static int winbond_read_fast(struct spi_flash *flash,
+ u32 offset, size_t len, void *buf)
+{
+ struct winbond_spi_flash *stm = to_winbond_spi_flash(flash);
+ u8 cmd[5];
+
+ cmd[0] = CMD_READ_ARRAY_FAST;
+ winbond_build_address(stm, cmd + 1, offset);
+ 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 *stm = to_winbond_spi_flash(flash);
+ unsigned long page_addr;
+ unsigned long byte_addr;
+ unsigned long page_size;
+ unsigned int page_shift;
+ size_t chunk_len;
+ size_t actual;
+ int ret;
+ u8 cmd[4];
+
+ page_shift = stm->params->l2_page_size;
+ page_size = (1 << page_shift);
+ 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;
+ }
+
+ for (actual = 0; actual < len; actual += chunk_len) {
+ chunk_len = min(len - actual, page_size - byte_addr);
+
+ cmd[0] = CMD_W25_PP;
+ cmd[1] = page_addr >> (16 - page_shift);
+ cmd[2] = page_addr << (page_shift - 8) | (byte_addr >> 8);
+ 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_W25_WREN, NULL, 0);
+ if (ret < 0) {
+ debug("SF: Enabling Write failed\n");
+ goto out;
+ }
+
+ ret = spi_flash_cmd_write(flash->spi, cmd, 4,
+ buf + actual, chunk_len);
+ if (ret < 0) {
+ debug("SF: Winbond Page Program failed\n");
+ goto out;
+ }
+
+ ret = winbond_wait_ready(flash, SPI_FLASH_PROG_TIMEOUT);
+ if (ret < 0) {
+ debug("SF: Winbond page programming timed out\n");
+ goto out;
+ }
+
+ page_addr++;
+ byte_addr = 0;
+ }
+
+ debug("SF: Winbond: Successfully programmed %u bytes @ 0x%x\n",
+ len, offset);
+ ret = 0;
+
+out:
+ spi_release_bus(flash->spi);
+ return ret;
+}
+
+int winbond_erase(struct spi_flash *flash, u32 offset, size_t len)
+{
+ struct winbond_spi_flash *stm = to_winbond_spi_flash(flash);
+ unsigned long sector_size;
+ unsigned int page_shift;
+ 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.
+ */
+
+ page_shift = stm->params->l2_page_size;
+ sector_size = (1 << page_shift) * stm->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;
+ }
+
+ for (actual = 0; actual < len; actual++) {
+ winbond_build_address(stm, &cmd[1], offset + actual * sector_size);
+ printf("Erase: %02x %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");
+ goto out;
+ }
+
+ ret = spi_flash_cmd_write(flash->spi, cmd, 4, NULL, 0);
+ if (ret < 0) {
+ debug("SF: Winbond sector erase failed\n");
+ goto out;
+ }
+
+ ret = winbond_wait_ready(flash, SPI_FLASH_PAGE_ERASE_TIMEOUT);
+ if (ret < 0) {
+ debug("SF: Winbond sector erase timed out\n");
+ goto out;
+ }
+ }
+
+ debug("SF: Winbond: Successfully erased %u bytes @ 0x%x\n",
+ len * sector_size, offset);
+ ret = 0;
+
+out:
+ 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;
+ unsigned long page_size;
+ struct winbond_spi_flash *stm;
+ unsigned int i;
+
+ for (i = 0; i < ARRAY_SIZE(winbond_spi_flash_table); i++) {
+ params = &winbond_spi_flash_table[i];
+ if (params->id == ((idcode[1] << 8) | idcode[2]))
+ break;
+ }
+
+ if (i == ARRAY_SIZE(winbond_spi_flash_table)) {
+ debug("SF: Unsupported Winbond ID %02x%02x\n",
+ idcode[1], idcode[2]);
+ return NULL;
+ }
+
+ stm = malloc(sizeof(struct winbond_spi_flash));
+ if (!stm) {
+ debug("SF: Failed to allocate memory\n");
+ return NULL;
+ }
+
+ stm->params = params;
+ stm->flash.spi = spi;
+ stm->flash.name = params->name;
+
+ /* Assuming power-of-two page size initially. */
+ page_size = 1 << params->l2_page_size;
+
+ stm->flash.write = winbond_write;
+ stm->flash.erase = winbond_erase;
+ stm->flash.read = winbond_read_fast;
+ stm->flash.size = page_size * params->pages_per_sector
+ * params->sectors_per_block
+ * params->nr_blocks;
+
+ debug("SF: Detected %s with page size %u, total %u bytes\n",
+ params->name, page_size, stm->flash.size);
+
+ return &stm->flash;
+}
projects / platform / kernel / u-boot.git / commitdiff