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 <d...@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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