Commit 7854643a authored by Chen Gong's avatar Chen Gong Committed by David Woodhouse
Browse files

[MTD] m25p80: chip erase != block erase != sector erase 



This fixes broken terminology added in the "m25p80.c erase enhance" patch,
which added a chip erase command but called it "block erase".  There are
already two block erase commands; blocks are 4KiB or 32KiB.  There's also
a sector erase (usually 64 KiB).  Chip erase typically covers Megabytes.

  OPCODE_BE   ==> OPCODE_CHIP_ERASE
  erase_block ==> erase_chip

[dbrownell@users.sourceforge.net: update sector erase comments too ]

Signed-off-by: default avatarChen Gong <clumsycg@gmail.com>
Signed-off-by: default avatarDavid Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarDavid Woodhouse <David.Woodhouse@intel.com>
parent 9168ab86

drivers/mtd/devices/m25p80.c

+13 −10
Original line number Diff line number Diff line
@@ -39,7 +39,7 @@ 
#define	OPCODE_PP		0x02	/* Page program (up to 256 bytes) */

#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)) {

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