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path: root/drivers/mtd/spi/spi_flash.c
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Diffstat (limited to 'drivers/mtd/spi/spi_flash.c')
-rw-r--r--drivers/mtd/spi/spi_flash.c57
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)
{