diff options
Diffstat (limited to 'drivers/mtd/nand/raw/qcom_nandc.c')
| -rw-r--r-- | drivers/mtd/nand/raw/qcom_nandc.c | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/drivers/mtd/nand/raw/qcom_nandc.c b/drivers/mtd/nand/raw/qcom_nandc.c index f1daf330951b..bd7a7251429b 100644 --- a/drivers/mtd/nand/raw/qcom_nandc.c +++ b/drivers/mtd/nand/raw/qcom_nandc.c @@ -459,11 +459,13 @@ struct qcom_nand_host { * among different NAND controllers. * @ecc_modes - ecc mode for NAND * @is_bam - whether NAND controller is using BAM + * @is_qpic - whether NAND CTRL is part of qpic IP * @dev_cmd_reg_start - NAND_DEV_CMD_* registers starting offset */ struct qcom_nandc_props { u32 ecc_modes; bool is_bam; + bool is_qpic; u32 dev_cmd_reg_start; }; @@ -2774,14 +2776,24 @@ static int qcom_nandc_setup(struct qcom_nand_controller *nandc) u32 nand_ctrl; /* kill onenand */ - nandc_write(nandc, SFLASHC_BURST_CFG, 0); + if (!nandc->props->is_qpic) + nandc_write(nandc, SFLASHC_BURST_CFG, 0); 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) { nand_ctrl = nandc_read(nandc, NAND_CTRL); - nandc_write(nandc, NAND_CTRL, nand_ctrl | BAM_MODE_EN); + + /* + *NAND_CTRL is an operational registers, and CPU + * access to operational registers are read only + * in BAM mode. So update the NAND_CTRL register + * only if it is not in BAM mode. In most cases BAM + * mode will be enabled in bootloader + */ + if (!(nand_ctrl & BAM_MODE_EN)) + nandc_write(nandc, NAND_CTRL, nand_ctrl | BAM_MODE_EN); } else { nandc_write(nandc, NAND_FLASH_CHIP_SELECT, DM_EN); } @@ -3035,12 +3047,14 @@ static const struct qcom_nandc_props ipq806x_nandc_props = { static const struct qcom_nandc_props ipq4019_nandc_props = { .ecc_modes = (ECC_BCH_4BIT | ECC_BCH_8BIT), .is_bam = true, + .is_qpic = true, .dev_cmd_reg_start = 0x0, }; static const struct qcom_nandc_props ipq8074_nandc_props = { .ecc_modes = (ECC_BCH_4BIT | ECC_BCH_8BIT), .is_bam = true, + .is_qpic = true, .dev_cmd_reg_start = 0x7000, }; |