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mtd: nand: txx9ndfmc: transfer 512 byte at a time if possible
Using __nand_correct_data() helper function, this driver can read 512 byte (with 6 byte ECC) at a time. This results minor performance improvement. Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
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0f777fb931
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1 changed files with 47 additions and 5 deletions
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@ -189,18 +189,43 @@ static int txx9ndfmc_calculate_ecc(struct mtd_info *mtd, const uint8_t *dat,
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uint8_t *ecc_code)
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{
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struct platform_device *dev = mtd_to_platdev(mtd);
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struct nand_chip *chip = mtd->priv;
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int eccbytes;
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u32 mcr = txx9ndfmc_read(dev, TXX9_NDFMCR);
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mcr &= ~TXX9_NDFMCR_ECC_ALL;
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txx9ndfmc_write(dev, mcr | TXX9_NDFMCR_ECC_OFF, TXX9_NDFMCR);
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txx9ndfmc_write(dev, mcr | TXX9_NDFMCR_ECC_READ, TXX9_NDFMCR);
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ecc_code[1] = txx9ndfmc_read(dev, TXX9_NDFDTR);
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ecc_code[0] = txx9ndfmc_read(dev, TXX9_NDFDTR);
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ecc_code[2] = txx9ndfmc_read(dev, TXX9_NDFDTR);
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for (eccbytes = chip->ecc.bytes; eccbytes > 0; eccbytes -= 3) {
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ecc_code[1] = txx9ndfmc_read(dev, TXX9_NDFDTR);
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ecc_code[0] = txx9ndfmc_read(dev, TXX9_NDFDTR);
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ecc_code[2] = txx9ndfmc_read(dev, TXX9_NDFDTR);
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ecc_code += 3;
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}
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txx9ndfmc_write(dev, mcr | TXX9_NDFMCR_ECC_OFF, TXX9_NDFMCR);
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return 0;
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}
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static int txx9ndfmc_correct_data(struct mtd_info *mtd, unsigned char *buf,
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unsigned char *read_ecc, unsigned char *calc_ecc)
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{
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struct nand_chip *chip = mtd->priv;
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int eccsize;
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int corrected = 0;
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int stat;
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for (eccsize = chip->ecc.size; eccsize > 0; eccsize -= 256) {
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stat = __nand_correct_data(buf, read_ecc, calc_ecc, 256);
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if (stat < 0)
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return stat;
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corrected += stat;
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buf += 256;
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read_ecc += 3;
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calc_ecc += 3;
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}
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return corrected;
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}
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static void txx9ndfmc_enable_hwecc(struct mtd_info *mtd, int mode)
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{
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struct platform_device *dev = mtd_to_platdev(mtd);
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@ -244,6 +269,22 @@ static void txx9ndfmc_initialize(struct platform_device *dev)
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#define TXX9NDFMC_NS_TO_CYC(gbusclk, ns) \
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DIV_ROUND_UP((ns) * DIV_ROUND_UP(gbusclk, 1000), 1000000)
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static int txx9ndfmc_nand_scan(struct mtd_info *mtd)
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{
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struct nand_chip *chip = mtd->priv;
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int ret;
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ret = nand_scan_ident(mtd, 1);
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if (!ret) {
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if (mtd->writesize >= 512) {
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chip->ecc.size = mtd->writesize;
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chip->ecc.bytes = 3 * (mtd->writesize / 256);
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}
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ret = nand_scan_tail(mtd);
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}
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return ret;
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}
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static int __init txx9ndfmc_probe(struct platform_device *dev)
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{
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struct txx9ndfmc_platform_data *plat = dev->dev.platform_data;
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@ -321,9 +362,10 @@ static int __init txx9ndfmc_probe(struct platform_device *dev)
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chip->cmd_ctrl = txx9ndfmc_cmd_ctrl;
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chip->dev_ready = txx9ndfmc_dev_ready;
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chip->ecc.calculate = txx9ndfmc_calculate_ecc;
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chip->ecc.correct = nand_correct_data;
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chip->ecc.correct = txx9ndfmc_correct_data;
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chip->ecc.hwctl = txx9ndfmc_enable_hwecc;
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chip->ecc.mode = NAND_ECC_HW;
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/* txx9ndfmc_nand_scan will overwrite ecc.size and ecc.bytes */
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chip->ecc.size = 256;
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chip->ecc.bytes = 3;
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chip->chip_delay = 100;
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@ -349,7 +391,7 @@ static int __init txx9ndfmc_probe(struct platform_device *dev)
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if (plat->wide_mask & (1 << i))
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chip->options |= NAND_BUSWIDTH_16;
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if (nand_scan(mtd, 1)) {
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if (txx9ndfmc_nand_scan(mtd)) {
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kfree(txx9_priv->mtdname);
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kfree(txx9_priv);
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continue;
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