mtd: rawnand: qcom: Pass 18 bit offset from NANDc base to BAM base

The BAM command descriptor provides only 18 bits to specify the BAM
register offset. Additionally, in the BAM command descriptor, the BAM
register offset is supposed to be specified as "(NANDc base - BAM base)
+ reg_off". Since, the BAM controller expecting the value in the form of
"NANDc base - BAM base", so that added a new field 'bam_offset' in the NAND
properties structure and use it while preparing the command descriptor.

Previously, the driver was specifying the NANDc base address in the BAM
command descriptor.

Cc: [email protected]
Fixes: 8d6b6d7 ("mtd: nand: qcom: support for command descriptor formation")
Tested-by: Lakshmi Sowjanya D <[email protected]>
Signed-off-by: Md Sadre Alam <[email protected]>
Acked-by: Mark Brown <[email protected]>
Tested-by: Gabor Juhos <[email protected]> # on IPQ9574
Reviewed-by: Manivannan Sadhasivam <[email protected]>
Signed-off-by: Miquel Raynal <[email protected]>

Author: Md Sadre Alam

drivers/mtd/nand/qpic_common.c

@@ -236,21 +236,21 @@ int qcom_prep_bam_dma_desc_cmd(struct qcom_nand_controller *nandc, bool read,
 	int i, ret;
 	struct bam_cmd_element *bam_ce_buffer;
 	struct bam_transaction *bam_txn = nandc->bam_txn;
+	u32 offset;
 
 	bam_ce_buffer = &bam_txn->bam_ce[bam_txn->bam_ce_pos];
 
 	/* fill the command desc */
 	for (i = 0; i < size; i++) {
+		offset = nandc->props->bam_offset + reg_off + 4 * i;
 		if (read)
 			bam_prep_ce(&bam_ce_buffer[i],
-				    nandc_reg_phys(nandc, reg_off + 4 * i),
-				    BAM_READ_COMMAND,
+				    offset, BAM_READ_COMMAND,
 				    reg_buf_dma_addr(nandc,
 						     (__le32 *)vaddr + i));
 		else
 			bam_prep_ce_le32(&bam_ce_buffer[i],
-					 nandc_reg_phys(nandc, reg_off + 4 * i),
-					 BAM_WRITE_COMMAND,
+					 offset, BAM_WRITE_COMMAND,
 					 *((__le32 *)vaddr + i));
 	}
 

drivers/mtd/nand/raw/qcom_nandc.c

@@ -2360,20 +2360,23 @@ static const struct qcom_nandc_props ipq806x_nandc_props = {
 	.supports_bam = false,
 	.use_codeword_fixup = true,
 	.dev_cmd_reg_start = 0x0,
+	.bam_offset = 0x30000,
 };
 
 static const struct qcom_nandc_props ipq4019_nandc_props = {
 	.ecc_modes = (ECC_BCH_4BIT | ECC_BCH_8BIT),
 	.supports_bam = true,
 	.nandc_part_of_qpic = true,
 	.dev_cmd_reg_start = 0x0,
+	.bam_offset = 0x30000,
 };
 
 static const struct qcom_nandc_props ipq8074_nandc_props = {
 	.ecc_modes = (ECC_BCH_4BIT | ECC_BCH_8BIT),
 	.supports_bam = true,
 	.nandc_part_of_qpic = true,
 	.dev_cmd_reg_start = 0x7000,
+	.bam_offset = 0x30000,
 };
 
 static const struct qcom_nandc_props sdx55_nandc_props = {
@@ -2382,6 +2385,7 @@ static const struct qcom_nandc_props sdx55_nandc_props = {
 	.nandc_part_of_qpic = true,
 	.qpic_version2 = true,
 	.dev_cmd_reg_start = 0x7000,
+	.bam_offset = 0x30000,
 };
 
 /*

drivers/spi/spi-qpic-snand.c

@@ -1605,6 +1605,7 @@ static void qcom_spi_remove(struct platform_device *pdev)
 
 static const struct qcom_nandc_props ipq9574_snandc_props = {
 	.dev_cmd_reg_start = 0x7000,
+	.bam_offset = 0x30000,
 	.supports_bam = true,
 };
 

include/linux/mtd/nand-qpic-common.h

@@ -199,9 +199,6 @@
  */
 #define dev_cmd_reg_addr(nandc, reg) ((nandc)->props->dev_cmd_reg_start + (reg))
 
-/* Returns the NAND register physical address */
-#define nandc_reg_phys(chip, offset) ((chip)->base_phys + (offset))
-
 /* Returns the dma address for reg read buffer */
 #define reg_buf_dma_addr(chip, vaddr) \
 	((chip)->reg_read_dma + \
@@ -454,6 +451,7 @@ struct qcom_nand_controller {
 struct qcom_nandc_props {
 	u32 ecc_modes;
 	u32 dev_cmd_reg_start;
+	u32 bam_offset;
 	bool supports_bam;
 	bool nandc_part_of_qpic;
 	bool qpic_version2;