mtd: atmel_nand: optimize read/write buffer functions

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Gitweb:     http://git.infradead.org/?p=mtd-2.6.git;a=commit;h=fb5427508abbd635e877fabdf55795488119c2d6
Commit:     fb5427508abbd635e877fabdf55795488119c2d6
Parent:     57b078a09bf0ab3f0babcfe6ecb2ac226d9178be
Author:     Nicolas Ferre <nicolas.ferre at atmel.com>
AuthorDate: Mon Jul 4 16:17:53 2011 +0200
Committer:  Artem Bityutskiy <artem.bityutskiy at intel.com>
CommitDate: Sun Sep 11 15:02:15 2011 +0300

    mtd: atmel_nand: optimize read/write buffer functions
    
    For PIO NAND access functions, we use the features of the SMC:
    - no need to take into account the NAND bus width: SMC will deal with this
    - use of an IO memcpy on the NAND chip-select space is able to generate
      proper SMC behavior.
    
    Signed-off-by: Nicolas Ferre <nicolas.ferre at atmel.com>
    Signed-off-by: Artem Bityutskiy <dedekind1 at gmail.com>
---
 drivers/mtd/nand/atmel_nand.c |   45 +++-------------------------------------
 1 files changed, 4 insertions(+), 41 deletions(-)

diff --git a/drivers/mtd/nand/atmel_nand.c b/drivers/mtd/nand/atmel_nand.c
index ee6e26e..23e5d77 100644
--- a/drivers/mtd/nand/atmel_nand.c
+++ b/drivers/mtd/nand/atmel_nand.c
@@ -161,37 +161,6 @@ static int atmel_nand_device_ready(struct mtd_info *mtd)
                 !!host->board->rdy_pin_active_low;
 }
 
-/*
- * Minimal-overhead PIO for data access.
- */
-static void atmel_read_buf8(struct mtd_info *mtd, u8 *buf, int len)
-{
-	struct nand_chip	*nand_chip = mtd->priv;
-
-	__raw_readsb(nand_chip->IO_ADDR_R, buf, len);
-}
-
-static void atmel_read_buf16(struct mtd_info *mtd, u8 *buf, int len)
-{
-	struct nand_chip	*nand_chip = mtd->priv;
-
-	__raw_readsw(nand_chip->IO_ADDR_R, buf, len / 2);
-}
-
-static void atmel_write_buf8(struct mtd_info *mtd, const u8 *buf, int len)
-{
-	struct nand_chip	*nand_chip = mtd->priv;
-
-	__raw_writesb(nand_chip->IO_ADDR_W, buf, len);
-}
-
-static void atmel_write_buf16(struct mtd_info *mtd, const u8 *buf, int len)
-{
-	struct nand_chip	*nand_chip = mtd->priv;
-
-	__raw_writesw(nand_chip->IO_ADDR_W, buf, len / 2);
-}
-
 static void dma_complete_func(void *completion)
 {
 	complete(completion);
@@ -266,33 +235,27 @@ err_buf:
 static void atmel_read_buf(struct mtd_info *mtd, u8 *buf, int len)
 {
 	struct nand_chip *chip = mtd->priv;
-	struct atmel_nand_host *host = chip->priv;
 
 	if (use_dma && len > mtd->oobsize)
 		/* only use DMA for bigger than oob size: better performances */
 		if (atmel_nand_dma_op(mtd, buf, len, 1) == 0)
 			return;
 
-	if (host->board->bus_width_16)
-		atmel_read_buf16(mtd, buf, len);
-	else
-		atmel_read_buf8(mtd, buf, len);
+	/* if no DMA operation possible, use PIO */
+	memcpy_fromio(buf, chip->IO_ADDR_R, len);
 }
 
 static void atmel_write_buf(struct mtd_info *mtd, const u8 *buf, int len)
 {
 	struct nand_chip *chip = mtd->priv;
-	struct atmel_nand_host *host = chip->priv;
 
 	if (use_dma && len > mtd->oobsize)
 		/* only use DMA for bigger than oob size: better performances */
 		if (atmel_nand_dma_op(mtd, (void *)buf, len, 0) == 0)
 			return;
 
-	if (host->board->bus_width_16)
-		atmel_write_buf16(mtd, buf, len);
-	else
-		atmel_write_buf8(mtd, buf, len);
+	/* if no DMA operation possible, use PIO */
+	memcpy_toio(chip->IO_ADDR_W, buf, len);
 }
 
 /*