diff options
Diffstat (limited to 'drivers/mtd')
| -rw-r--r-- | drivers/mtd/nand/tegra_nand.c | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/drivers/mtd/nand/tegra_nand.c b/drivers/mtd/nand/tegra_nand.c index 5408c51..4d94cc6 100644 --- a/drivers/mtd/nand/tegra_nand.c +++ b/drivers/mtd/nand/tegra_nand.c @@ -219,6 +219,34 @@ static uint8_t read_byte(struct mtd_info *mtd) } /** + * Read len bytes from the chip into a buffer + * + * @param mtd MTD device structure + * @param buf buffer to store data to + * @param len number of bytes to read + * + * Read function for 8bit bus-width + */ +static void read_buf(struct mtd_info *mtd, uint8_t *buf, int len) +{ + int i, s; + unsigned int reg; + struct nand_chip *chip = mtd->priv; + struct nand_drv *info = (struct nand_drv *)chip->priv; + + for (i = 0; i < len; i += 4) { + s = (len - i) > 4 ? 4 : len - i; + writel(CMD_PIO | CMD_RX | CMD_A_VALID | CMD_CE0 | + ((s - 1) << CMD_TRANS_SIZE_SHIFT) | CMD_GO, + &info->reg->command); + if (!nand_waitfor_cmd_completion(info->reg)) + puts("Command timeout during read_buf\n"); + reg = readl(&info->reg->resp); + memcpy(buf + i, ®, s); + } +} + +/** * Check NAND status to see if it is ready or not * * @param mtd MTD device structure @@ -317,6 +345,7 @@ static void nand_command(struct mtd_info *mtd, unsigned int command, switch (command) { case NAND_CMD_READID: writel(NAND_CMD_READID, &info->reg->cmd_reg1); + writel(column & 0xFF, &info->reg->addr_reg1); writel(CMD_GO | CMD_CLE | CMD_ALE | CMD_PIO | CMD_RX | ((4 - 1) << CMD_TRANS_SIZE_SHIFT) @@ -324,6 +353,12 @@ static void nand_command(struct mtd_info *mtd, unsigned int command, &info->reg->command); info->pio_byte_index = 0; break; + case NAND_CMD_PARAM: + writel(NAND_CMD_PARAM, &info->reg->cmd_reg1); + writel(column & 0xFF, &info->reg->addr_reg1); + writel(CMD_GO | CMD_CLE | CMD_ALE | CMD_CE0, + &info->reg->command); + break; case NAND_CMD_READ0: writel(NAND_CMD_READ0, &info->reg->cmd_reg1); writel(NAND_CMD_READSTART, &info->reg->cmd_reg2); @@ -976,6 +1011,7 @@ int tegra_nand_init(struct nand_chip *nand, int devnum) nand->options = LP_OPTIONS; nand->cmdfunc = nand_command; nand->read_byte = read_byte; + nand->read_buf = read_buf; nand->ecc.read_page = nand_read_page_hwecc; nand->ecc.write_page = nand_write_page_hwecc; nand->ecc.read_page_raw = nand_read_page_raw; |