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| author | Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com> | 2011-12-31 16:21:29 +0100 |
|---|---|---|
| committer | Sascha Hauer <s.hauer@pengutronix.de> | 2012-01-02 12:08:24 +0100 |
| commit | 809f0f6327241504b5071622a8d573255f91a875 (patch) | |
| tree | bb6a091d5175a44d1bae8495bec1509f981dc8d1 /drivers/mtd/nand/atmel_nand.c | |
| parent | de8c4de5ef7d8962b36c396a75e17a655fc247b2 (diff) | |
| download | barebox-809f0f6327241504b5071622a8d573255f91a875.tar.gz barebox-809f0f6327241504b5071622a8d573255f91a875.tar.xz | |
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@atmel.com>
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'drivers/mtd/nand/atmel_nand.c')
| -rw-r--r-- | drivers/mtd/nand/atmel_nand.c | 33 |
1 files changed, 8 insertions, 25 deletions
diff --git a/drivers/mtd/nand/atmel_nand.c b/drivers/mtd/nand/atmel_nand.c index 534a065783..95fda45d3d 100644 --- a/drivers/mtd/nand/atmel_nand.c +++ b/drivers/mtd/nand/atmel_nand.c @@ -148,30 +148,16 @@ static int atmel_nand_device_ready(struct mtd_info *mtd) */ static void atmel_read_buf(struct mtd_info *mtd, u8 *buf, int len) { - struct nand_chip *nand_chip = mtd->priv; + struct nand_chip *chip = mtd->priv; - 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; - - readsw(nand_chip->IO_ADDR_R, buf, len / 2); + 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 *nand_chip = mtd->priv; + struct nand_chip *chip = mtd->priv; - 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; - - writesw(nand_chip->IO_ADDR_W, buf, len / 2); + memcpy_toio(chip->IO_ADDR_W, buf, len); } /* @@ -417,14 +403,11 @@ static int __init atmel_nand_probe(struct device_d *dev) nand_chip->chip_delay = 20; /* 20us command delay time */ - if (host->board->bus_width_16) { /* 16-bit bus width */ + if (host->board->bus_width_16) /* 16-bit bus width */ nand_chip->options |= NAND_BUSWIDTH_16; - nand_chip->read_buf = atmel_read_buf16; - nand_chip->write_buf = atmel_write_buf16; - } else { - nand_chip->read_buf = atmel_read_buf; - nand_chip->write_buf = atmel_write_buf; - } + + nand_chip->read_buf = atmel_read_buf; + nand_chip->write_buf = atmel_write_buf; atmel_nand_enable(host); |