[U-Boot] [PATCH] tegra: nand: make ONFI detection work
Scott Wood
scottwood at freescale.com
Sat Sep 29 00:35:01 CEST 2012
On 09/28/2012 10:56:51 AM, Lucas Stach wrote:
> Add the missing bits to the Tegra NAND driver to make ONFI detection
> work
> properly.
>
> Also add it to the Tegra default config, as it seems to be a
> reasonable thing
> to have it available on all boards that use any kind of NAND.
>
> Signed-off-by: Lucas Stach <dev at lynxeye.de>
> ---
> drivers/mtd/nand/tegra_nand.c | 36
> ++++++++++++++++++++++++++++++++++++
> include/configs/tegra20-common.h | 1 +
> 2 Dateien geändert, 37 Zeilen hinzugefügt(+)
>
> diff --git a/drivers/mtd/nand/tegra_nand.c
> b/drivers/mtd/nand/tegra_nand.c
> index 2c1b533..0d7ca5d 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))
> + printf("Command timeout during read_buf\n");
> + reg = readl(&info->reg->resp);
> + memcpy(buf + i, ®, s);
> + }
> +}
Out of curiousity, what is it about this that needed a custom
read_buf() where you didn't need one before?
-Scott
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