Newer versions of PXA3xx NAND controller support a 4th Command Buffer
register. Add the required HWFLAGS and additional write to NDCB0.
Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@xxxxxxxxx>
---
Cc: Robert Jarzmik <robert.jarzmik@xxxxxxx>
Cc: Thomas Petazzoni <thomas.petazzoni@xxxxxxxxxxxxxxxxxx>
Cc: Ezequiel Garcia <ezequiel@xxxxxxxxxxxxxxxxxxxx>
Cc: barebox@xxxxxxxxxxxxxxxxxxx
---
drivers/mtd/nand/nand_mrvl_nfc.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
diff --git a/drivers/mtd/nand/nand_mrvl_nfc.c b/drivers/mtd/nand/nand_mrvl_nfc.c
index 16752c1aa4d5..8594cf688d0c 100644
--- a/drivers/mtd/nand/nand_mrvl_nfc.c
+++ b/drivers/mtd/nand/nand_mrvl_nfc.c
@@ -53,6 +53,7 @@
#define NDCB0 (0x48) /* Command Buffer0 */
#define NDCB1 (0x4C) /* Command Buffer1 */
#define NDCB2 (0x50) /* Command Buffer2 */
+#define NDCB3 (0x54) /* Command Buffer3 */
#define NDCR_SPARE_EN (0x1 << 31)
#define NDCR_ECC_EN (0x1 << 30)
@@ -146,6 +147,7 @@ struct mrvl_nand_host {
void __iomem *mmio_base;
unsigned int hwflags;
#define HWFLAGS_ECC_BCH BIT(0)
+#define HWFLAGS_HAS_NDCB3 BIT(1)
unsigned int buf_start;
unsigned int buf_count;
@@ -458,12 +460,19 @@ static void mrvl_nand_start(struct mrvl_nand_host *host)
dev_err(host->dev, "Waiting for command request failed\n");
} else {
/*
- * Writing 12 bytes to NDBC0 sets NDBC0, NDBC1 and NDBC2 !
+ * Command buffer registers NDCB{0-2,3}
+ * must be loaded by writing directly either 12 or 16
+ * bytes directly to NDCB0, four bytes at a time.
+ *
+ * Direct write access to NDCB1, NDCB2 and NDCB3 is ignored
+ * but each NDCBx register can be read.
*/
nand_writel(host, NDSR, NDSR_WRCMDREQ);
nand_writel(host, NDCB0, host->ndcb0);
nand_writel(host, NDCB0, host->ndcb1);
nand_writel(host, NDCB0, host->ndcb2);
+ if (host->hwflags & HWFLAGS_HAS_NDCB3)
+ nand_writel(host, NDCB0, host->ndcb3);
}
}
--
2.1.0
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