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path: root/drivers/mtd/devices/m25p80.c
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Diffstat (limited to 'drivers/mtd/devices/m25p80.c')
-rw-r--r--drivers/mtd/devices/m25p80.c28
1 files changed, 16 insertions, 12 deletions
diff --git a/drivers/mtd/devices/m25p80.c b/drivers/mtd/devices/m25p80.c
index 76a76751da3..6659b2275c0 100644
--- a/drivers/mtd/devices/m25p80.c
+++ b/drivers/mtd/devices/m25p80.c
@@ -37,9 +37,9 @@
#define OPCODE_NORM_READ 0x03 /* Read data bytes (low frequency) */
#define OPCODE_FAST_READ 0x0b /* Read data bytes (high frequency) */
#define OPCODE_PP 0x02 /* Page program (up to 256 bytes) */
-#define OPCODE_BE_4K 0x20 /* Erase 4KiB block */
+#define OPCODE_BE_4K 0x20 /* Erase 4KiB block */
#define OPCODE_BE_32K 0x52 /* Erase 32KiB block */
-#define OPCODE_BE 0xc7 /* Erase whole flash block */
+#define OPCODE_CHIP_ERASE 0xc7 /* Erase whole flash chip */
#define OPCODE_SE 0xd8 /* Sector erase (usually 64KiB) */
#define OPCODE_RDID 0x9f /* Read JEDEC ID */
@@ -167,7 +167,7 @@ static int wait_till_ready(struct m25p *flash)
*
* Returns 0 if successful, non-zero otherwise.
*/
-static int erase_block(struct m25p *flash)
+static int erase_chip(struct m25p *flash)
{
DEBUG(MTD_DEBUG_LEVEL3, "%s: %s %dKiB\n",
flash->spi->dev.bus_id, __func__,
@@ -181,7 +181,7 @@ static int erase_block(struct m25p *flash)
write_enable(flash);
/* Set up command buffer. */
- flash->command[0] = OPCODE_BE;
+ flash->command[0] = OPCODE_CHIP_ERASE;
spi_write(flash->spi, flash->command, 1);
@@ -250,15 +250,18 @@ static int m25p80_erase(struct mtd_info *mtd, struct erase_info *instr)
mutex_lock(&flash->lock);
- /* REVISIT in some cases we could speed up erasing large regions
- * by using OPCODE_SE instead of OPCODE_BE_4K
- */
-
- /* now erase those sectors */
- if (len == flash->mtd.size && erase_block(flash)) {
+ /* whole-chip erase? */
+ if (len == flash->mtd.size && erase_chip(flash)) {
instr->state = MTD_ERASE_FAILED;
mutex_unlock(&flash->lock);
return -EIO;
+
+ /* REVISIT in some cases we could speed up erasing large regions
+ * by using OPCODE_SE instead of OPCODE_BE_4K. We may have set up
+ * to use "small sector erase", but that's not always optimal.
+ */
+
+ /* "sector"-at-a-time erase */
} else {
while (len) {
if (erase_sector(flash, addr)) {
@@ -574,10 +577,11 @@ static struct flash_info *__devinit jedec_probe(struct spi_device *spi)
for (tmp = 0, info = m25p_data;
tmp < ARRAY_SIZE(m25p_data);
tmp++, info++) {
- if (info->jedec_id == jedec)
- if (ext_jedec != 0 && info->ext_id != ext_jedec)
+ if (info->jedec_id == jedec) {
+ if (info->ext_id != 0 && info->ext_id != ext_jedec)
continue;
return info;
+ }
}
dev_err(&spi->dev, "unrecognized JEDEC id %06x\n", jedec);
return NULL;