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authorMike Frysinger <vapier@gentoo.org>2011-01-10 02:20:13 -0500
committerWolfgang Denk <wd@denx.de>2011-04-11 21:00:54 +0200
commite7b44eddbef88b1a922f8d82088ba236aad01caf (patch)
tree4ba07d5e3ed3d4b9992afb6f2a47f556aa3d6741 /drivers/mtd/spi/spi_flash.c
parent6163045bcd276818d9ad6bdd1bf36ddcd60d014b (diff)
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sf: unify erase functions
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Diffstat (limited to 'drivers/mtd/spi/spi_flash.c')
-rw-r--r--drivers/mtd/spi/spi_flash.c58
1 files changed, 58 insertions, 0 deletions
diff --git a/drivers/mtd/spi/spi_flash.c b/drivers/mtd/spi/spi_flash.c
index e483ce4..ca4bbb2 100644
--- a/drivers/mtd/spi/spi_flash.c
+++ b/drivers/mtd/spi/spi_flash.c
@@ -14,6 +14,14 @@
#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;
+}
+
static int spi_flash_read_write(struct spi_slave *spi,
const u8 *cmd, size_t cmd_len,
const u8 *data_out, u8 *data_in,
@@ -110,6 +118,56 @@ int spi_flash_cmd_wait_ready(struct spi_flash *flash, unsigned long timeout)
CMD_READ_STATUS, STATUS_WIP);
}
+int spi_flash_cmd_erase(struct spi_flash *flash, u8 erase_cmd,
+ u32 erase_size, u32 offset, size_t len)
+{
+ u32 start, end;
+ int ret;
+ u8 cmd[4];
+
+ if (offset % erase_size || len % erase_size) {
+ debug("SF: Erase offset/length not multiple of erase size\n");
+ return -1;
+ }
+
+ ret = spi_claim_bus(flash->spi);
+ if (ret) {
+ debug("SF: Unable to claim SPI bus\n");
+ return ret;
+ }
+
+ cmd[0] = erase_cmd;
+ start = offset;
+ end = start + len;
+
+ while (offset < end) {
+ spi_flash_addr(offset, cmd);
+ offset += erase_size;
+
+ debug("SF: erase %2x %2x %2x %2x (%x)\n", cmd[0], cmd[1],
+ cmd[2], cmd[3], offset);
+
+ ret = spi_flash_cmd(flash->spi, CMD_WRITE_ENABLE, NULL, 0);
+ if (ret)
+ goto out;
+
+ ret = spi_flash_cmd_write(flash->spi, cmd, sizeof(cmd), NULL, 0);
+ if (ret)
+ goto out;
+
+ ret = spi_flash_cmd_wait_ready(flash, SPI_FLASH_PAGE_ERASE_TIMEOUT);
+ if (ret)
+ goto out;
+ }
+
+ debug("SF: Successfully erased %lu bytes @ %#x\n",
+ len * erase_size, start);
+
+ out:
+ spi_release_bus(flash->spi);
+ return ret;
+}
+
/*
* The following table holds all device probe functions
*