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tegra: nand: make ONFI detection work

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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@lynxeye.de>
Acked-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Tom Warren <twarren@nvidia.com>
This commit is contained in:
Lucas Stach 2012-10-07 11:29:38 +00:00 committed by Tom Warren
parent 56f42f85f5
commit a833b95039
2 changed files with 37 additions and 0 deletions
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36
drivers/mtd/nand/tegra_nand.c
View File

@ -218,6 +218,34 @@ static uint8_t read_byte(struct mtd_info *mtd)
return (uint8_t)dword_read;
}
/**
* 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, &reg, s);
}
}
/**
* Check NAND status to see if it is ready or not
*
@ -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;

1
include/configs/tegra20-common.h
View File

@ -200,5 +200,6 @@
#define CONFIG_SPL_LDSCRIPT "$(CPUDIR)/tegra20/u-boot-spl.lds"
#define CONFIG_SYS_NAND_SELF_INIT
#define CONFIG_SYS_NAND_ONFI_DETECTION
#endif /* __TEGRA20_COMMON_H */