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Subject[PATCH 4/5] mtd: rawnand: qcom: Add helper to configure location register
Date
Create a nandc_set_read_loc() helper to abstract the
configuration of the location register.

QPIC v2 onwards features a separate location register
for the last codeword, so introducing this extra helper
which will simplify the addition of QPIC v2 support.

Signed-off-by: Md Sadre Alam <mdalam@codeaurora.org>
---
drivers/mtd/nand/raw/qcom_nandc.c | 36 ++++++++++++++++++++++++------------
1 file changed, 24 insertions(+), 12 deletions(-)

diff --git a/drivers/mtd/nand/raw/qcom_nandc.c b/drivers/mtd/nand/raw/qcom_nandc.c
index f1aafee..57d2ad02 100644
--- a/drivers/mtd/nand/raw/qcom_nandc.c
+++ b/drivers/mtd/nand/raw/qcom_nandc.c
@@ -181,8 +181,8 @@
#define ECC_BCH_4BIT BIT(2)
#define ECC_BCH_8BIT BIT(3)

-#define nandc_set_read_loc(chip, reg, cw_offset, read_size, is_last_read_loc) \
-nandc_set_reg(chip, NAND_READ_LOCATION_##reg, \
+#define nandc_set_read_loc_first(chip, reg, cw_offset, read_size, is_last_read_loc) \
+nandc_set_reg(chip, reg, \
((cw_offset) << READ_LOCATION_OFFSET) | \
((read_size) << READ_LOCATION_SIZE) | \
((is_last_read_loc) << READ_LOCATION_LAST))
@@ -668,6 +668,18 @@ static bool qcom_nandc_is_last_cw(struct nand_ecc_ctrl *ecc, int cw)
return cw == (ecc->steps - 1);
}

+/* helper to configure location register values */
+static void nandc_set_read_loc(struct nand_chip *chip, int cw, int reg,
+ int cw_offset, int read_size, int is_last_read_loc)
+{
+ int reg_base = NAND_READ_LOCATION_0;
+
+ reg_base += reg * 4;
+
+ return nandc_set_read_loc_first(chip, reg_base, cw_offset,
+ read_size, is_last_read_loc);
+}
+
/* helper to configure address register values */
static void set_address(struct qcom_nand_host *host, u16 column, int page)
{
@@ -725,7 +737,7 @@ static void update_rw_regs(struct qcom_nand_host *host, int num_cw, bool read)
nandc_set_reg(chip, NAND_EXEC_CMD, 1);

if (read)
- nandc_set_read_loc(chip, 0, 0, host->use_ecc ?
+ nandc_set_read_loc(chip, 0, 0, 0, host->use_ecc ?
host->cw_data : host->cw_size, 1);
}

@@ -1218,7 +1230,7 @@ static int nandc_param(struct qcom_nand_host *host)
nandc_set_reg(chip, NAND_DEV_CMD_VLD_RESTORE, nandc->vld);
}

- nandc_set_read_loc(chip, 0, 0, 512, 1);
+ nandc_set_read_loc(chip, 0, 0, 0, 512, 1);

if (!nandc->props->qpic_v2) {
write_reg_dma(nandc, NAND_DEV_CMD_VLD, 1, 0);
@@ -1646,16 +1658,16 @@ qcom_nandc_read_cw_raw(struct mtd_info *mtd, struct nand_chip *chip,
}

if (nandc->props->is_bam) {
- nandc_set_read_loc(chip, 0, read_loc, data_size1, 0);
+ nandc_set_read_loc(chip, cw, 0, read_loc, data_size1, 0);
read_loc += data_size1;

- nandc_set_read_loc(chip, 1, read_loc, oob_size1, 0);
+ nandc_set_read_loc(chip, cw, 1, read_loc, oob_size1, 0);
read_loc += oob_size1;

- nandc_set_read_loc(chip, 2, read_loc, data_size2, 0);
+ nandc_set_read_loc(chip, cw, 2, read_loc, data_size2, 0);
read_loc += data_size2;

- nandc_set_read_loc(chip, 3, read_loc, oob_size2, 1);
+ nandc_set_read_loc(chip, cw, 3, read_loc, oob_size2, 1);
}

config_nand_cw_read(chip, false);
@@ -1886,13 +1898,13 @@ static int read_page_ecc(struct qcom_nand_host *host, u8 *data_buf,

if (nandc->props->is_bam) {
if (data_buf && oob_buf) {
- nandc_set_read_loc(chip, 0, 0, data_size, 0);
- nandc_set_read_loc(chip, 1, data_size,
+ nandc_set_read_loc(chip, i, 0, 0, data_size, 0);
+ nandc_set_read_loc(chip, i, 1, data_size,
oob_size, 1);
} else if (data_buf) {
- nandc_set_read_loc(chip, 0, 0, data_size, 1);
+ nandc_set_read_loc(chip, i, 0, 0, data_size, 1);
} else {
- nandc_set_read_loc(chip, 0, data_size,
+ nandc_set_read_loc(chip, i, 0, data_size,
oob_size, 1);
}
}
--
2.7.4
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