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Commit 9c01f87d authored by Kyungmin Park's avatar Kyungmin Park Committed by Jarkko Lavinen
Browse files

OneNAND: handle byte access on BufferRAM 



Signed-off-by: default avatarKyungmin Park <kyungmin.park@samsung.com>
parent 628bee65

drivers/mtd/onenand/onenand_base.c

+38 −0
Original line number Diff line number Diff line
@@ -373,6 +373,17 @@ static int onenand_read_bufferram(struct mtd_info *mtd, int area, 


	bufferram += onenand_bufferram_offset(mtd, area);



	if (ONENAND_CHECK_BYTE_ACCESS(count)) {

		unsigned short word;



		/* Align with word(16-bit) size */

		count--;



		/* Read word and save byte */

		word = this->read_word(bufferram + offset + count);

		buffer[count] = (word & 0xff);

	}



	memcpy(buffer, bufferram + offset, count);



	return 0;
@@ -400,6 +411,17 @@ static int onenand_sync_read_bufferram(struct mtd_info *mtd, int area, 


	this->mmcontrol(mtd, ONENAND_SYS_CFG1_SYNC_READ);



	if (ONENAND_CHECK_BYTE_ACCESS(count)) {

		unsigned short word;



		/* Align with word(16-bit) size */

		count--;



		/* Read word and save byte */

		word = this->read_word(bufferram + offset + count);

		buffer[count] = (word & 0xff);

	}



	memcpy(buffer, bufferram + offset, count);



	this->mmcontrol(mtd, 0);
@@ -427,6 +449,22 @@ static int onenand_write_bufferram(struct mtd_info *mtd, int area, 


	bufferram += onenand_bufferram_offset(mtd, area);



	if (ONENAND_CHECK_BYTE_ACCESS(count)) {

		unsigned short word;

		int byte_offset;



		/* Align with word(16-bit) size */

		count--;



		/* Calculate byte access offset */

		byte_offset = offset + count;



		/* Read word and save byte */

		word = this->read_word(bufferram + byte_offset);

		word = (word & ~0xff) | buffer[count];

		this->write_word(word, bufferram + byte_offset);

	}



	memcpy(bufferram + offset, buffer, count);



	return 0;

include/linux/mtd/onenand.h

+3 −0
Original line number Diff line number Diff line
@@ -130,6 +130,9 @@ struct onenand_chip { 
#define ONENAND_SET_SYS_CFG1(v, this)					\

	(this->write_word(v, this->base + ONENAND_REG_SYS_CFG1))



/* Check byte access in OneNAND */

#define ONENAND_CHECK_BYTE_ACCESS(addr)		(addr & 0x1)



/*

 * Options bits

 */