[PATCH v5 07/16] mtd: nand: qcom: enable BAM or ADM mode

[Abhishek Sahu]

1. DM_EN is only required for EBI2 NAND controller which uses ADM
2. BAM mode will be disabled after power on reset which needs to
   be enabled before starting any BAM transfers.

Reviewed-by: Archit Taneja <architt at codeaurora.org>
Signed-off-by: Abhishek Sahu <absahu at codeaurora.org>
---

* Changes from v4: None

 drivers/mtd/nand/qcom_nandc.c | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/drivers/mtd/nand/qcom_nandc.c b/drivers/mtd/nand/qcom_nandc.c
index 81cfce7..fd77d59 100644
--- a/drivers/mtd/nand/qcom_nandc.c
+++ b/drivers/mtd/nand/qcom_nandc.c
@@ -163,6 +163,9 @@
 #define NAND_DEV_CMD_VLD_VAL		(READ_START_VLD | WRITE_START_VLD | \
 					 ERASE_START_VLD | SEQ_READ_START_VLD)
 
+/* NAND_CTRL bits */
+#define	BAM_MODE_EN			BIT(0)
+
 /*
  * the NAND controller performs reads/writes with ECC in 516 byte chunks.
  * the driver calls the chunks 'step' or 'codeword' interchangeably
@@ -1042,7 +1045,8 @@ static int read_id(struct qcom_nand_host *host, int column)
 	nandc_set_reg(nandc, NAND_FLASH_CMD, FETCH_ID);
 	nandc_set_reg(nandc, NAND_ADDR0, column);
 	nandc_set_reg(nandc, NAND_ADDR1, 0);
-	nandc_set_reg(nandc, NAND_FLASH_CHIP_SELECT, DM_EN);
+	nandc_set_reg(nandc, NAND_FLASH_CHIP_SELECT,
+		      nandc->props->is_bam ? 0 : DM_EN);
 	nandc_set_reg(nandc, NAND_EXEC_CMD, 1);
 
 	write_reg_dma(nandc, NAND_FLASH_CMD, 4, NAND_BAM_NEXT_SGL);
@@ -2414,12 +2418,19 @@ static void qcom_nandc_unalloc(struct qcom_nand_controller *nandc)
 /* one time setup of a few nand controller registers */
 static int qcom_nandc_setup(struct qcom_nand_controller *nandc)
 {
+	u32 nand_ctrl;
+
 	/* kill onenand */
 	nandc_write(nandc, SFLASHC_BURST_CFG, 0);
 	nandc_write(nandc, NAND_DEV_CMD_VLD, NAND_DEV_CMD_VLD_VAL);
 
-	/* enable ADM DMA */
-	nandc_write(nandc, NAND_FLASH_CHIP_SELECT, DM_EN);
+	/* enable ADM or BAM DMA */
+	if (nandc->props->is_bam) {
+		nand_ctrl = nandc_read(nandc, NAND_CTRL);
+		nandc_write(nandc, NAND_CTRL, nand_ctrl | BAM_MODE_EN);
+	} else {
+		nandc_write(nandc, NAND_FLASH_CHIP_SELECT, DM_EN);
+	}
 
 	/* save the original values of these registers */
 	nandc->cmd1 = nandc_read(nandc, NAND_DEV_CMD1);
-- 
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