[PATCH v5 09/16] mtd: nand: qcom: support for different DEV_CMD register offsets

[Abhishek Sahu <absahu@codeaurora.org>]

The FLASH_DEV_CMD registers starting offset is not same in
different QPIC NAND controller versions. This patch adds
the starting offset in NAND controller properties and uses
the same for calculating the actual offset of these registers.

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

* Changes from v4:

1. Changed macro name from nandc_dev_addr to dev_cmd_reg_addr
2. Modified comment for nandc_dev_addr
3. Changed new property variable name from flash_dev_offset to
   dev_cmd_reg_start

 drivers/mtd/nand/qcom_nandc.c | 25 +++++++++++++++++++------
 1 file changed, 19 insertions(+), 6 deletions(-)

diff --git a/drivers/mtd/nand/qcom_nandc.c b/drivers/mtd/nand/qcom_nandc.c
index 1ff5daf..7977a70 100644
--- a/drivers/mtd/nand/qcom_nandc.c
+++ b/drivers/mtd/nand/qcom_nandc.c
@@ -193,6 +193,12 @@
 	      ((size) << READ_LOCATION_SIZE) |			\
 	      ((is_last) << READ_LOCATION_LAST))
 
+/*
+ * Returns the actual register address for all NAND_DEV_ registers
+ * (i.e. NAND_DEV_CMD0, NAND_DEV_CMD1, NAND_DEV_CMD2 and NAND_DEV_CMD_VLD)
+ */
+#define dev_cmd_reg_addr(nandc, reg) ((nandc)->props->dev_cmd_reg_start + (reg))
+
 #define QPIC_PER_CW_CMD_SGL		32
 #define QPIC_PER_CW_DATA_SGL		8
 
@@ -429,10 +435,12 @@ struct qcom_nand_host {
  * among different NAND controllers.
  * @ecc_modes - ecc mode for NAND
  * @is_bam - whether NAND controller is using BAM
+ * @dev_cmd_reg_start - NAND_DEV_CMD_* registers starting offset
  */
 struct qcom_nandc_props {
 	u32 ecc_modes;
 	bool is_bam;
+	u32 dev_cmd_reg_start;
 };
 
 /* Frees the BAM transaction memory */
@@ -848,6 +856,9 @@ static int read_reg_dma(struct qcom_nand_controller *nandc, int first,
 	if (first == NAND_READ_ID || first == NAND_FLASH_STATUS)
 		flow_control = true;
 
+	if (first == NAND_DEV_CMD_VLD || first == NAND_DEV_CMD1)
+		first = dev_cmd_reg_addr(nandc, first);
+
 	size = num_regs * sizeof(u32);
 	vaddr = nandc->reg_read_buf + nandc->reg_read_pos;
 	nandc->reg_read_pos += num_regs;
@@ -886,11 +897,11 @@ static int write_reg_dma(struct qcom_nand_controller *nandc, int first,
 	if (first == NAND_EXEC_CMD)
 		flags |= NAND_BAM_NWD;
 
-	if (first == NAND_DEV_CMD1_RESTORE)
-		first = NAND_DEV_CMD1;
+	if (first == NAND_DEV_CMD1_RESTORE || first == NAND_DEV_CMD1)
+		first = dev_cmd_reg_addr(nandc, NAND_DEV_CMD1);
 
-	if (first == NAND_DEV_CMD_VLD_RESTORE)
-		first = NAND_DEV_CMD_VLD;
+	if (first == NAND_DEV_CMD_VLD_RESTORE || first == NAND_DEV_CMD_VLD)
+		first = dev_cmd_reg_addr(nandc, NAND_DEV_CMD_VLD);
 
 	size = num_regs * sizeof(u32);
 
@@ -2498,7 +2509,8 @@ static int qcom_nandc_setup(struct qcom_nand_controller *nandc)
 
 	/* kill onenand */
 	nandc_write(nandc, SFLASHC_BURST_CFG, 0);
-	nandc_write(nandc, NAND_DEV_CMD_VLD, NAND_DEV_CMD_VLD_VAL);
+	nandc_write(nandc, dev_cmd_reg_addr(nandc, NAND_DEV_CMD_VLD),
+		    NAND_DEV_CMD_VLD_VAL);
 
 	/* enable ADM or BAM DMA */
 	if (nandc->props->is_bam) {
@@ -2509,7 +2521,7 @@ static int qcom_nandc_setup(struct qcom_nand_controller *nandc)
 	}
 
 	/* save the original values of these registers */
-	nandc->cmd1 = nandc_read(nandc, NAND_DEV_CMD1);
+	nandc->cmd1 = nandc_read(nandc, dev_cmd_reg_addr(nandc, NAND_DEV_CMD1));
 	nandc->vld = NAND_DEV_CMD_VLD_VAL;
 
 	return 0;
@@ -2758,6 +2770,7 @@ static int qcom_nandc_remove(struct platform_device *pdev)
 static const struct qcom_nandc_props ipq806x_nandc_props = {
 	.ecc_modes = (ECC_RS_4BIT | ECC_BCH_8BIT),
 	.is_bam = false,
+	.dev_cmd_reg_start = 0x0,
 };
 
 /*
-- 
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation