[U-Boot] [PATCH v2] tegra: nand: make ONFI detection work
Lucas Stach
dev at lynxeye.de
Sun Oct 7 23:29:38 CEST 2012
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>
---
v2: use puts instead of printf
---
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 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;
diff --git a/include/configs/tegra20-common.h b/include/configs/tegra20-common.h
index 744dc59..9e60020 100644
--- a/include/configs/tegra20-common.h
+++ b/include/configs/tegra20-common.h
@@ -204,5 +204,6 @@
#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 */
--
1.7.11.4
More information about the U-Boot
mailing list