From: Chong Huang chuang@ucrobotics.com
Signed-off-by: Chong Huang chuang@ucrobotics.com Signed-off-by: Haitao Zhang minipanda@linuxrobot.org Signed-off-by: Mike Frysinger vapier@gentoo.org --- drivers/mtd/spi/Makefile | 1 + drivers/mtd/spi/eon.c | 275 ++++++++++++++++++++++++++++++++++ drivers/mtd/spi/spi_flash.c | 3 + drivers/mtd/spi/spi_flash_internal.h | 1 + 4 files changed, 280 insertions(+), 0 deletions(-) create mode 100644 drivers/mtd/spi/eon.c
diff --git a/drivers/mtd/spi/Makefile b/drivers/mtd/spi/Makefile index 3d607c0..57112af 100644 --- a/drivers/mtd/spi/Makefile +++ b/drivers/mtd/spi/Makefile @@ -27,6 +27,7 @@ LIB := $(obj)libspi_flash.o
COBJS-$(CONFIG_SPI_FLASH) += spi_flash.o COBJS-$(CONFIG_SPI_FLASH_ATMEL) += atmel.o +COBJS-$(CONFIG_SPI_FLASH_EON) += eon.o COBJS-$(CONFIG_SPI_FLASH_MACRONIX) += macronix.o COBJS-$(CONFIG_SPI_FLASH_SPANSION) += spansion.o COBJS-$(CONFIG_SPI_FLASH_SST) += sst.o diff --git a/drivers/mtd/spi/eon.c b/drivers/mtd/spi/eon.c new file mode 100644 index 0000000..02c3bb9 --- /dev/null +++ b/drivers/mtd/spi/eon.c @@ -0,0 +1,275 @@ +/* + * (C) Copyright 2010, ucRobotics Inc. + * Author: Chong Huang chuang@ucrobotics.com + * Licensed under the GPL-2 or later. + */ + +#include <common.h> +#include <malloc.h> +#include <spi_flash.h> + +#include "spi_flash_internal.h" + +/* EN25Q128-specific commands */ +#define CMD_EN25Q128_WREN 0x06 /* Write Enable */ +#define CMD_EN25Q128_WRDI 0x04 /* Write Disable */ +#define CMD_EN25Q128_RDSR 0x05 /* Read Status Register */ +#define CMD_EN25Q128_WRSR 0x01 /* Write Status Register */ +#define CMD_EN25Q128_READ 0x03 /* Read Data Bytes */ +#define CMD_EN25Q128_FAST_READ 0x0b /* Read Data Bytes at Higher Speed */ +#define CMD_EN25Q128_PP 0x02 /* Page Program */ +#define CMD_EN25Q128_SE 0x20 /* Sector Erase */ +#define CMD_EN25Q128_BE 0xd8 /* Block Erase */ +#define CMD_EN25Q128_DP 0xb9 /* Deep Power-down */ +#define CMD_EN25Q128_RES 0xab /* Release from DP, and Read Signature */ + +#define EON_ID_EN25Q128 0x18 + +#define EON_SR_WIP (1 << 0) /* Write-in-Progress */ + +struct eon_spi_flash_params { + u8 idcode1; + u16 page_size; + u16 pages_per_sector; + u16 sectors_per_block; + u16 nr_sectors; + const char *name; +}; + +/* spi_flash needs to be first so upper layers can free() it */ +struct eon_spi_flash { + struct spi_flash flash; + const struct eon_spi_flash_params *params; +}; + +static inline struct eon_spi_flash *to_eon_spi_flash(struct spi_flash *flash) +{ + return container_of(flash, struct eon_spi_flash, flash); +} + +static const struct eon_spi_flash_params eon_spi_flash_table[] = { + { + .idcode1 = EON_ID_EN25Q128, + .page_size = 256, + .pages_per_sector = 16, + .sectors_per_block = 16, + .nr_sectors = 4096, + .name = "EN25Q128", + }, +}; + +static int eon_wait_ready(struct spi_flash *flash, unsigned long timeout) +{ + struct spi_slave *spi = flash->spi; + unsigned long timebase; + int ret; + u8 cmd = CMD_EN25Q128_RDSR; + u8 status; + + ret = spi_xfer(spi, 8, &cmd, 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 & EON_SR_WIP) == 0) + break; + + } while (get_timer(timebase) < timeout); + + spi_xfer(spi, 0, NULL, NULL, SPI_XFER_END); + + if ((status & EON_SR_WIP) == 0) + return 0; + + /* Timed out */ + return -1; +} + +static int eon_read_fast(struct spi_flash *flash, + u32 offset, size_t len, void *buf) +{ + struct eon_spi_flash *eon = to_eon_spi_flash(flash); + unsigned long page_addr; + unsigned long page_size; + u8 cmd[5]; + + page_size = eon->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; + + return spi_flash_read_common(flash, cmd, sizeof(cmd), buf, len); +} + +static int eon_write(struct spi_flash *flash, + u32 offset, size_t len, const void *buf) +{ + struct eon_spi_flash *eon = to_eon_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 = eon->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_EN25Q128_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_EN25Q128_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: EON Page Program failed\n"); + break; + } + + ret = eon_wait_ready(flash, SPI_FLASH_PROG_TIMEOUT); + if (ret < 0) { + debug("SF: EON page programming timed out\n"); + break; + } + + page_addr++; + byte_addr = 0; + } + + debug("SF: EON: Successfully programmed %u bytes @ 0x%x\n", + len, offset); + + spi_release_bus(flash->spi); + return ret; +} + +int eon_erase(struct spi_flash *flash, u32 offset, size_t len) +{ + /* block erase */ + struct eon_spi_flash *eon = to_eon_spi_flash(flash); + unsigned long block_size; + size_t actual; + int ret; + u8 cmd[4]; + + + block_size = eon->params->page_size * eon->params->pages_per_sector + * eon->params->sectors_per_block; + + if (offset % block_size || len % block_size) { + debug("SF: Erase offset/length not multiple of block size\n"); + return -1; + } + + len /= block_size; + cmd[0] = CMD_EN25Q128_BE; + 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 / block_size) + actual; + ret = spi_flash_cmd(flash->spi, CMD_EN25Q128_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: EON page erase failed\n"); + break; + } + + ret = eon_wait_ready(flash, SPI_FLASH_PAGE_ERASE_TIMEOUT); + if (ret < 0) { + debug("SF: EON page erase timed out\n"); + break; + } + } + + debug("SF: EON: Successfully erased %u bytes @ 0x%x\n", + len * block_size, offset); + + spi_release_bus(flash->spi); + return ret; +} + +struct spi_flash *spi_flash_probe_eon(struct spi_slave *spi, u8 *idcode) +{ + const struct eon_spi_flash_params *params; + struct eon_spi_flash *eon; + unsigned int i; + + for (i = 0; i < ARRAY_SIZE(eon_spi_flash_table); ++i) { + params = &eon_spi_flash_table[i]; + if (params->idcode1 == idcode[2]) + break; + } + + if (i == ARRAY_SIZE(eon_spi_flash_table)) { + debug("SF: Unsupported EON ID %02x\n", idcode[1]); + return NULL; + } + + eon = malloc(sizeof(*eon)); + if (!eon) { + debug("SF: Failed to allocate memory\n"); + return NULL; + } + + eon->params = params; + eon->flash.spi = spi; + eon->flash.name = params->name; + + eon->flash.write = eon_write; + eon->flash.erase = eon_erase; + eon->flash.read = eon_read_fast; + eon->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, eon->flash.size); + + return &eon->flash; +} diff --git a/drivers/mtd/spi/spi_flash.c b/drivers/mtd/spi/spi_flash.c index ab02ef3..b61d219 100644 --- a/drivers/mtd/spi/spi_flash.c +++ b/drivers/mtd/spi/spi_flash.c @@ -131,6 +131,9 @@ static const struct { #ifdef CONFIG_SPI_FLASH_ATMEL { 0, 0x1f, spi_flash_probe_atmel, }, #endif +#ifdef CONFIG_SPI_FLASH_EON + { 0, 0x1c, spi_flash_probe_eon, }, +#endif #ifdef CONFIG_SPI_FLASH_MACRONIX { 0, 0xc2, spi_flash_probe_macronix, }, #endif diff --git a/drivers/mtd/spi/spi_flash_internal.h b/drivers/mtd/spi/spi_flash_internal.h index 9bc43dd..68dcffb 100644 --- a/drivers/mtd/spi/spi_flash_internal.h +++ b/drivers/mtd/spi/spi_flash_internal.h @@ -46,6 +46,7 @@ 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_eon(struct spi_slave *spi, u8 *idcode); struct spi_flash *spi_flash_probe_macronix(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);