diff options
Diffstat (limited to 'drivers/mtd/spi/spi_flash.c')
| -rw-r--r-- | drivers/mtd/spi/spi_flash.c | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/drivers/mtd/spi/spi_flash.c b/drivers/mtd/spi/spi_flash.c index 3e0d02d..730c009 100644 --- a/drivers/mtd/spi/spi_flash.c +++ b/drivers/mtd/spi/spi_flash.c @@ -65,6 +65,63 @@ int spi_flash_cmd_write(struct spi_slave *spi, const u8 *cmd, size_t cmd_len, return spi_flash_read_write(spi, cmd, cmd_len, data, NULL, data_len); } +int spi_flash_cmd_write_multi(struct spi_flash *flash, u32 offset, + size_t len, const void *buf) +{ + unsigned long page_addr, byte_addr, page_size; + size_t chunk_len, actual; + int ret; + u8 cmd[4]; + + page_size = flash->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; + } + + cmd[0] = CMD_PAGE_PROGRAM; + for (actual = 0; actual < len; actual += chunk_len) { + chunk_len = min(len - actual, page_size - byte_addr); + + 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 = %zu\n", + buf + actual, cmd[0], cmd[1], cmd[2], cmd[3], chunk_len); + + ret = spi_flash_cmd_write_enable(flash); + 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: write failed\n"); + break; + } + + ret = spi_flash_cmd_wait_ready(flash, SPI_FLASH_PROG_TIMEOUT); + if (ret) + break; + + page_addr++; + byte_addr = 0; + } + + debug("SF: program %s %zu bytes @ %#x\n", + ret ? "failure" : "success", len, offset); + + spi_release_bus(flash->spi); + return ret; +} + int spi_flash_read_common(struct spi_flash *flash, const u8 *cmd, size_t cmd_len, void *data, size_t data_len) { |