diff options
Diffstat (limited to 'drivers/mtd/spi/spi_flash_ops.c')
| -rw-r--r-- | drivers/mtd/spi/spi_flash_ops.c | 314 |
1 files changed, 314 insertions, 0 deletions
diff --git a/drivers/mtd/spi/spi_flash_ops.c b/drivers/mtd/spi/spi_flash_ops.c new file mode 100644 index 0000000000..6133363f42 --- /dev/null +++ b/drivers/mtd/spi/spi_flash_ops.c @@ -0,0 +1,314 @@ +/* + * SPI flash operations + * + * Copyright (C) 2008 Atmel Corporation + * Copyright (C) 2010 Reinhard Meyer, EMK Elektronik + * Copyright (C) 2013 Jagannadha Sutradharudu Teki, Xilinx Inc. + * + * Licensed under the GPL-2 or later. + */ + +#include <common.h> +#include <spi.h> +#include <spi_flash.h> +#include <watchdog.h> + +#include "spi_flash_internal.h" + +static void spi_flash_addr(u32 addr, u8 *cmd) +{ + /* cmd[0] is actual command */ + cmd[1] = addr >> 16; + cmd[2] = addr >> 8; + cmd[3] = addr >> 0; +} + +int spi_flash_cmd_write_status(struct spi_flash *flash, u8 sr) +{ + u8 cmd; + int ret; + + cmd = CMD_WRITE_STATUS; + ret = spi_flash_write_common(flash, &cmd, 1, &sr, 1); + if (ret < 0) { + debug("SF: fail to write status register\n"); + return ret; + } + + return 0; +} + +#ifdef CONFIG_SPI_FLASH_BAR +int spi_flash_cmd_bankaddr_write(struct spi_flash *flash, u8 bank_sel) +{ + u8 cmd; + int ret; + + if (flash->bank_curr == bank_sel) { + debug("SF: not require to enable bank%d\n", bank_sel); + return 0; + } + + cmd = flash->bank_write_cmd; + ret = spi_flash_write_common(flash, &cmd, 1, &bank_sel, 1); + if (ret < 0) { + debug("SF: fail to write bank register\n"); + return ret; + } + flash->bank_curr = bank_sel; + + return 0; +} +#endif + +int spi_flash_cmd_wait_ready(struct spi_flash *flash, unsigned long timeout) +{ + struct spi_slave *spi = flash->spi; + unsigned long timebase; + int ret; + u8 status; + u8 check_status = 0x0; + u8 poll_bit = STATUS_WIP; + u8 cmd = flash->poll_cmd; + + if (cmd == CMD_FLAG_STATUS) { + poll_bit = STATUS_PEC; + check_status = poll_bit; + } + + ret = spi_xfer(spi, 8, &cmd, NULL, SPI_XFER_BEGIN); + if (ret) { + debug("SF: fail to read %s status register\n", + cmd == CMD_READ_STATUS ? "read" : "flag"); + return ret; + } + + timebase = get_timer(0); + do { + WATCHDOG_RESET(); + + ret = spi_xfer(spi, 8, NULL, &status, 0); + if (ret) + return -1; + + if ((status & poll_bit) == check_status) + break; + + } while (get_timer(timebase) < timeout); + + spi_xfer(spi, 0, NULL, NULL, SPI_XFER_END); + + if ((status & poll_bit) == check_status) + return 0; + + /* Timed out */ + debug("SF: time out!\n"); + return -1; +} + +int spi_flash_write_common(struct spi_flash *flash, const u8 *cmd, + size_t cmd_len, const void *buf, size_t buf_len) +{ + struct spi_slave *spi = flash->spi; + unsigned long timeout = SPI_FLASH_PROG_TIMEOUT; + int ret; + + if (buf == NULL) + timeout = SPI_FLASH_PAGE_ERASE_TIMEOUT; + + ret = spi_claim_bus(flash->spi); + if (ret) { + debug("SF: unable to claim SPI bus\n"); + return ret; + } + + ret = spi_flash_cmd_write_enable(flash); + if (ret < 0) { + debug("SF: enabling write failed\n"); + return ret; + } + + ret = spi_flash_cmd_write(spi, cmd, cmd_len, buf, buf_len); + if (ret < 0) { + debug("SF: write cmd failed\n"); + return ret; + } + + ret = spi_flash_cmd_wait_ready(flash, timeout); + if (ret < 0) { + debug("SF: write %s timed out\n", + timeout == SPI_FLASH_PROG_TIMEOUT ? + "program" : "page erase"); + return ret; + } + + spi_release_bus(spi); + + return ret; +} + +int spi_flash_cmd_erase(struct spi_flash *flash, u32 offset, size_t len) +{ + u32 erase_size; + u8 cmd[4]; + int ret = -1; + + erase_size = flash->sector_size; + if (offset % erase_size || len % erase_size) { + debug("SF: Erase offset/length not multiple of erase size\n"); + return -1; + } + + if (erase_size == 4096) + cmd[0] = CMD_ERASE_4K; + else + cmd[0] = CMD_ERASE_64K; + + while (len) { +#ifdef CONFIG_SPI_FLASH_BAR + u8 bank_sel; + + bank_sel = offset / SPI_FLASH_16MB_BOUN; + + ret = spi_flash_cmd_bankaddr_write(flash, bank_sel); + if (ret) { + debug("SF: fail to set bank%d\n", bank_sel); + return ret; + } +#endif + spi_flash_addr(offset, cmd); + + debug("SF: erase %2x %2x %2x %2x (%x)\n", cmd[0], cmd[1], + cmd[2], cmd[3], offset); + + ret = spi_flash_write_common(flash, cmd, sizeof(cmd), NULL, 0); + if (ret < 0) { + debug("SF: erase failed\n"); + break; + } + + offset += erase_size; + len -= erase_size; + } + + return ret; +} + +int spi_flash_cmd_write_multi(struct spi_flash *flash, u32 offset, + size_t len, const void *buf) +{ + unsigned long byte_addr, page_size; + size_t chunk_len, actual; + u8 cmd[4]; + int ret = -1; + + page_size = flash->page_size; + + cmd[0] = CMD_PAGE_PROGRAM; + for (actual = 0; actual < len; actual += chunk_len) { +#ifdef CONFIG_SPI_FLASH_BAR + u8 bank_sel; + + bank_sel = offset / SPI_FLASH_16MB_BOUN; + + ret = spi_flash_cmd_bankaddr_write(flash, bank_sel); + if (ret) { + debug("SF: fail to set bank%d\n", bank_sel); + return ret; + } +#endif + byte_addr = offset % page_size; + chunk_len = min(len - actual, page_size - byte_addr); + + if (flash->spi->max_write_size) + chunk_len = min(chunk_len, flash->spi->max_write_size); + + spi_flash_addr(offset, cmd); + + debug("PP: 0x%p => cmd = { 0x%02x 0x%02x%02x%02x } chunk_len = %zu\n", + buf + actual, cmd[0], cmd[1], cmd[2], cmd[3], chunk_len); + + ret = spi_flash_write_common(flash, cmd, sizeof(cmd), + buf + actual, chunk_len); + if (ret < 0) { + debug("SF: write failed\n"); + break; + } + + offset += chunk_len; + } + + return ret; +} + +int spi_flash_read_common(struct spi_flash *flash, const u8 *cmd, + size_t cmd_len, void *data, size_t data_len) +{ + struct spi_slave *spi = flash->spi; + int ret; + + ret = spi_claim_bus(flash->spi); + if (ret) { + debug("SF: unable to claim SPI bus\n"); + return ret; + } + + ret = spi_flash_cmd_read(spi, cmd, cmd_len, data, data_len); + if (ret < 0) { + debug("SF: read cmd failed\n"); + return ret; + } + + spi_release_bus(spi); + + return ret; +} + +int spi_flash_cmd_read_fast(struct spi_flash *flash, u32 offset, + size_t len, void *data) +{ + u8 cmd[5], bank_sel = 0; + u32 remain_len, read_len; + int ret = -1; + + /* Handle memory-mapped SPI */ + if (flash->memory_map) { + memcpy(data, flash->memory_map + offset, len); + return 0; + } + + cmd[0] = CMD_READ_ARRAY_FAST; + cmd[4] = 0x00; + + while (len) { +#ifdef CONFIG_SPI_FLASH_BAR + bank_sel = offset / SPI_FLASH_16MB_BOUN; + + ret = spi_flash_cmd_bankaddr_write(flash, bank_sel); + if (ret) { + debug("SF: fail to set bank%d\n", bank_sel); + return ret; + } +#endif + remain_len = (SPI_FLASH_16MB_BOUN * (bank_sel + 1) - offset); + if (len < remain_len) + read_len = len; + else + read_len = remain_len; + + spi_flash_addr(offset, cmd); + + ret = spi_flash_read_common(flash, cmd, sizeof(cmd), + data, read_len); + if (ret < 0) { + debug("SF: read failed\n"); + break; + } + + offset += read_len; + len -= read_len; + data += read_len; + } + + return ret; +} |