diff options
| -rw-r--r-- | drivers/mtd/spi/Makefile | 1 | ||||
| -rw-r--r-- | drivers/mtd/spi/spi_flash.c | 5 | ||||
| -rw-r--r-- | drivers/mtd/spi/spi_flash_internal.h | 1 | ||||
| -rw-r--r-- | drivers/mtd/spi/sst.c | 358 |
4 files changed, 365 insertions, 0 deletions
diff --git a/drivers/mtd/spi/Makefile b/drivers/mtd/spi/Makefile index 6ca6073..a71b16e 100644 --- a/drivers/mtd/spi/Makefile +++ b/drivers/mtd/spi/Makefile @@ -28,6 +28,7 @@ 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-$(CONFIG_SPI_FLASH_SST) += sst.o COBJS-$(CONFIG_SPI_FLASH_STMICRO) += stmicro.o COBJS := $(COBJS-y) diff --git a/drivers/mtd/spi/spi_flash.c b/drivers/mtd/spi/spi_flash.c index f002c0e..21ba5f9 100644 --- a/drivers/mtd/spi/spi_flash.c +++ b/drivers/mtd/spi/spi_flash.c @@ -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..2d020c3 100644 --- a/drivers/mtd/spi/spi_flash_internal.h +++ b/drivers/mtd/spi/spi_flash_internal.h @@ -43,4 +43,5 @@ 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; +} |