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mtd: spi-nor: factor out write_enable() for erase commands

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write_enable() was being duplicated to both m25p80.c and fsl-quadspi.c.
But this should be handled within the spi-nor abstraction layer.

At the same time, let's add write_disable() after erasing, so we don't
leave the flash in a write-enabled state afterward.

Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Acked-by: Huang Shijie <shijie.huang@intel.com>
This commit is contained in:
Brian Norris 2014-11-05 02:29:03 -08:00
parent 6d7604e517
commit 05241aead9
3 changed files with 6 additions and 14 deletions
Download patch file Download diff file Expand all files Collapse all files

6
drivers/mtd/devices/m25p80.c
View file

@ -157,16 +157,10 @@ static int m25p80_read(struct spi_nor *nor, loff_t from, size_t len,
static int m25p80_erase(struct spi_nor *nor, loff_t offset) static int m25p80_erase(struct spi_nor *nor, loff_t offset)
{ {
struct m25p *flash = nor->priv; struct m25p *flash = nor->priv;
int ret;
dev_dbg(nor->dev, "%dKiB at 0x%08x\n", dev_dbg(nor->dev, "%dKiB at 0x%08x\n",
flash->mtd.erasesize / 1024, (u32)offset); flash->mtd.erasesize / 1024, (u32)offset);
/* Send write enable, then erase commands. */
ret = nor->write_reg(nor, SPINOR_OP_WREN, NULL, 0, 0);
if (ret)
return ret;
/* Set up command buffer. */ /* Set up command buffer. */
flash->command[0] = nor->erase_opcode; flash->command[0] = nor->erase_opcode;
m25p_addr2cmd(nor, offset, flash->command); m25p_addr2cmd(nor, offset, flash->command);

5
drivers/mtd/spi-nor/fsl-quadspi.c
View file

@ -738,11 +738,6 @@ static int fsl_qspi_erase(struct spi_nor *nor, loff_t offs)
dev_dbg(nor->dev, "%dKiB at 0x%08x:0x%08x\n", dev_dbg(nor->dev, "%dKiB at 0x%08x:0x%08x\n",
nor->mtd->erasesize / 1024, q->chip_base_addr, (u32)offs); nor->mtd->erasesize / 1024, q->chip_base_addr, (u32)offs);
/* Send write enable, then erase commands. */
ret = nor->write_reg(nor, SPINOR_OP_WREN, NULL, 0, 0);
if (ret)
return ret;
ret = fsl_qspi_runcmd(q, nor->erase_opcode, offs, 0); ret = fsl_qspi_runcmd(q, nor->erase_opcode, offs, 0);
if (ret) if (ret)
return ret; return ret;

9
drivers/mtd/spi-nor/spi-nor.c
View file

@ -265,9 +265,6 @@ static int erase_chip(struct spi_nor *nor)
{ {
dev_dbg(nor->dev, " %lldKiB\n", (long long)(nor->mtd->size >> 10)); dev_dbg(nor->dev, " %lldKiB\n", (long long)(nor->mtd->size >> 10));
/* Send write enable, then erase commands. */
write_enable(nor);
return nor->write_reg(nor, SPINOR_OP_CHIP_ERASE, NULL, 0, 0); return nor->write_reg(nor, SPINOR_OP_CHIP_ERASE, NULL, 0, 0);
} }
@ -322,6 +319,8 @@ static int spi_nor_erase(struct mtd_info *mtd, struct erase_info *instr)
/* whole-chip erase? */ /* whole-chip erase? */
if (len == mtd->size) { if (len == mtd->size) {
write_enable(nor);
if (erase_chip(nor)) { if (erase_chip(nor)) {
ret = -EIO; ret = -EIO;
goto erase_err; goto erase_err;
@ -339,6 +338,8 @@ static int spi_nor_erase(struct mtd_info *mtd, struct erase_info *instr)
/* "sector"-at-a-time erase */ /* "sector"-at-a-time erase */
} else { } else {
while (len) { while (len) {
write_enable(nor);
if (nor->erase(nor, addr)) { if (nor->erase(nor, addr)) {
ret = -EIO; ret = -EIO;
goto erase_err; goto erase_err;
@ -353,6 +354,8 @@ static int spi_nor_erase(struct mtd_info *mtd, struct erase_info *instr)
} }
} }
write_disable(nor);
spi_nor_unlock_and_unprep(nor, SPI_NOR_OPS_ERASE); spi_nor_unlock_and_unprep(nor, SPI_NOR_OPS_ERASE);
instr->state = MTD_ERASE_DONE; instr->state = MTD_ERASE_DONE;