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Commit faff3750 authored by Chen Gong's avatar Chen Gong Committed by David Woodhouse
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[MTD] m25p80.c erase enhance 



This patch adds an erase_block command to enhance erase operation

Signed-off-by: default avatarChen Gong <g.chen@freescale.com>
Signed-off-by: default avatarDavid Woodhouse <David.Woodhouse@intel.com>
parent d483492c

drivers/mtd/devices/m25p80.c

+40 −8
Original line number Diff line number Diff line
@@ -39,6 +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_SE		0xd8	/* Sector erase (usually 64KiB) */

#define	OPCODE_RDID		0x9f	/* Read JEDEC ID */
@@ -161,6 +162,31 @@ static int wait_till_ready(struct m25p *flash) 
	return 1;

}



/*

 * Erase the whole flash memory

 *

 * Returns 0 if successful, non-zero otherwise.

 */

static int erase_block(struct m25p *flash)

{

	DEBUG(MTD_DEBUG_LEVEL3, "%s: %s %dKiB\n",

			flash->spi->dev.bus_id, __func__,

			flash->mtd.size / 1024);



	/* Wait until finished previous write command. */

	if (wait_till_ready(flash))

		return 1;



	/* Send write enable, then erase commands. */

	write_enable(flash);



	/* Set up command buffer. */

	flash->command[0] = OPCODE_BE;



	spi_write(flash->spi, flash->command, 1);



	return 0;

}



/*

 * Erase one sector of flash memory at offset ``offset'' which is any
@@ -229,6 +255,11 @@ static int m25p80_erase(struct mtd_info *mtd, struct erase_info *instr) 
	 */



	/* now erase those sectors */

	if (len == flash->mtd.size && erase_block(flash)) {

		instr->state = MTD_ERASE_FAILED;

		mutex_unlock(&flash->lock);

		return -EIO;

	} else {

		while (len) {

			if (erase_sector(flash, addr)) {

				instr->state = MTD_ERASE_FAILED;
@@ -239,6 +270,7 @@ static int m25p80_erase(struct mtd_info *mtd, struct erase_info *instr) 
			addr += mtd->erasesize;

			len -= mtd->erasesize;

		}

	}



	mutex_unlock(&flash->lock);