[PATCH V4] mtd: rawnand: qcom: update last code word register

Md Sadre Alam
2021-01-28T21:41:16Z

From QPIC version 2.0 onwards new register got added to
read last codeword. This change will add the READ_LOCATION_LAST_CW_n
register.

For first three code word READ_LOCATION_n register will be
use.For last code word READ_LOCATION_LAST_CW_n register will be
use.

Signed-off-by: Md Sadre Alam <mdalam@codeaurora.org>
---
[V4]
* Modified condition for nandc_set_read_loc_last() in qcom_nandc_read_cw_raw().
* Added one additional argument "last_cw" to the function config_nand_cw_read()
to handle last code word condition.
* Changed total number of last code word register "NAND_READ_LOCATION_LAST_CW_0" to 4
while doing code word configuration.
drivers/mtd/nand/raw/qcom_nandc.c | 110 +++++++++++++++++++++++++++++---------
1 file changed, 84 insertions(+), 26 deletions(-)

diff --git a/drivers/mtd/nand/raw/qcom_nandc.c b/drivers/mtd/nand/raw/qcom_nandc.c
index 667e4bf..9484be8 100644
--- a/drivers/mtd/nand/raw/qcom_nandc.c
+++ b/drivers/mtd/nand/raw/qcom_nandc.c
@@ -48,6 +48,10 @@
#define NAND_READ_LOCATION_1 0xf24
#define NAND_READ_LOCATION_2 0xf28
#define NAND_READ_LOCATION_3 0xf2c
+#define NAND_READ_LOCATION_LAST_CW_0 0xf40
+#define NAND_READ_LOCATION_LAST_CW_1 0xf44
+#define NAND_READ_LOCATION_LAST_CW_2 0xf48
+#define NAND_READ_LOCATION_LAST_CW_3 0xf4c

/* dummy register offsets, used by write_reg_dma */
#define NAND_DEV_CMD1_RESTORE 0xdead
@@ -187,6 +191,12 @@ nandc_set_reg(nandc, NAND_READ_LOCATION_##reg, \
((size) << READ_LOCATION_SIZE) | \
((is_last) << READ_LOCATION_LAST))

+#define nandc_set_read_loc_last(nandc, reg, offset, size, is_last) \
+nandc_set_reg(nandc, NAND_READ_LOCATION_LAST_CW_##reg, \
+ ((offset) << READ_LOCATION_OFFSET) | \
+ ((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)
@@ -316,6 +326,10 @@ struct nandc_regs {
__le32 read_location1;
__le32 read_location2;
__le32 read_location3;
+ __le32 read_location_last0;
+ __le32 read_location_last1;
+ __le32 read_location_last2;
+ __le32 read_location_last3;

__le32 erased_cw_detect_cfg_clr;
__le32 erased_cw_detect_cfg_set;
@@ -644,6 +658,14 @@ static __le32 *offset_to_nandc_reg(struct nandc_regs *regs, int offset)
return &regs->read_location2;
case NAND_READ_LOCATION_3:
return &regs->read_location3;
+ case NAND_READ_LOCATION_LAST_CW_0:
+ return &regs->read_location_last0;
+ case NAND_READ_LOCATION_LAST_CW_1:
+ return &regs->read_location_last1;
+ case NAND_READ_LOCATION_LAST_CW_2:
+ return &regs->read_location_last2;
+ case NAND_READ_LOCATION_LAST_CW_3:
+ return &regs->read_location_last3;
default:
return NULL;
}
@@ -719,9 +741,14 @@ static void update_rw_regs(struct qcom_nand_host *host, int num_cw, bool read)
nandc_set_reg(nandc, NAND_READ_STATUS, host->clrreadstatus);
nandc_set_reg(nandc, NAND_EXEC_CMD, 1);

- if (read)
- nandc_set_read_loc(nandc, 0, 0, host->use_ecc ?
- host->cw_data : host->cw_size, 1);
+ if (read) {
+ if (nandc->props->qpic_v2)
+ nandc_set_read_loc_last(nandc, 0, 0, host->use_ecc ?
+ host->cw_data : host->cw_size, 1);
+ else
+ nandc_set_read_loc(nandc, 0, 0, host->use_ecc ?
+ host->cw_data : host->cw_size, 1);
+ }
}

/*
@@ -1094,11 +1121,16 @@ static void config_nand_page_read(struct qcom_nand_controller *nandc)
* before reading each codeword in NAND page.
*/
static void
-config_nand_cw_read(struct qcom_nand_controller *nandc, bool use_ecc)
+config_nand_cw_read(struct qcom_nand_controller *nandc, bool use_ecc, bool last_cw)
{
- if (nandc->props->is_bam)
- write_reg_dma(nandc, NAND_READ_LOCATION_0, 4,
- NAND_BAM_NEXT_SGL);
+ if (nandc->props->is_bam) {
+ if (nandc->props->qpic_v2 && last_cw)
+ write_reg_dma(nandc, NAND_READ_LOCATION_LAST_CW_0, 4,
+ NAND_BAM_NEXT_SGL);
+ else
+ write_reg_dma(nandc, NAND_READ_LOCATION_0, 4,
+ NAND_BAM_NEXT_SGL);
+ }

write_reg_dma(nandc, NAND_FLASH_CMD, 1, NAND_BAM_NEXT_SGL);
write_reg_dma(nandc, NAND_EXEC_CMD, 1, NAND_BAM_NEXT_SGL);
@@ -1118,10 +1150,10 @@ config_nand_cw_read(struct qcom_nand_controller *nandc, bool use_ecc)
*/
static void
config_nand_single_cw_page_read(struct qcom_nand_controller *nandc,
- bool use_ecc)
+ bool use_ecc, bool last_cw)
{
config_nand_page_read(nandc);
- config_nand_cw_read(nandc, use_ecc);
+ config_nand_cw_read(nandc, use_ecc, last_cw);
}

/*
@@ -1215,7 +1247,7 @@ static int nandc_param(struct qcom_nand_host *host)
nandc->buf_count = 512;
memset(nandc->data_buffer, 0xff, nandc->buf_count);

- config_nand_single_cw_page_read(nandc, false);
+ config_nand_single_cw_page_read(nandc, false, false);

read_data_dma(nandc, FLASH_BUF_ACC, nandc->data_buffer,
nandc->buf_count, 0);
@@ -1633,19 +1665,32 @@ qcom_nandc_read_cw_raw(struct mtd_info *mtd, struct nand_chip *chip,
}

if (nandc->props->is_bam) {
- nandc_set_read_loc(nandc, 0, read_loc, data_size1, 0);
- read_loc += data_size1;
+ if (nandc->props->qpic_v2 && cw == (ecc->steps - 1)) {
+ nandc_set_read_loc_last(nandc, 0, read_loc, data_size1, 0);
+ read_loc += data_size1;
+
+ nandc_set_read_loc_last(nandc, 1, read_loc, oob_size1, 0);
+ read_loc += oob_size1;

- nandc_set_read_loc(nandc, 1, read_loc, oob_size1, 0);
- read_loc += oob_size1;
+ nandc_set_read_loc_last(nandc, 2, read_loc, data_size2, 0);
+ read_loc += data_size2;

- nandc_set_read_loc(nandc, 2, read_loc, data_size2, 0);
- read_loc += data_size2;
+ nandc_set_read_loc_last(nandc, 3, read_loc, oob_size2, 1);
+ } else {
+ nandc_set_read_loc(nandc, 0, read_loc, data_size1, 0);
+ read_loc += data_size1;
+
+ nandc_set_read_loc(nandc, 1, read_loc, oob_size1, 0);
+ read_loc += oob_size1;

- nandc_set_read_loc(nandc, 3, read_loc, oob_size2, 1);
+ nandc_set_read_loc(nandc, 2, read_loc, data_size2, 0);
+ read_loc += data_size2;
+
+ nandc_set_read_loc(nandc, 3, read_loc, oob_size2, 1);
+ }
}

- config_nand_cw_read(nandc, false);
+ config_nand_cw_read(nandc, false, cw == ecc->steps - 1 ? true : false);

read_data_dma(nandc, reg_off, data_buf, data_size1, 0);
reg_off += data_size1;
@@ -1873,18 +1918,31 @@ 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(nandc, 0, 0, data_size, 0);
- nandc_set_read_loc(nandc, 1, data_size,
- oob_size, 1);
+ if (nandc->props->qpic_v2 && i == (ecc->steps - 1)) {
+ nandc_set_read_loc_last(nandc, 0, 0, data_size, 0);
+ nandc_set_read_loc_last(nandc, 1, data_size,
+ oob_size, 1);
+ } else {
+ nandc_set_read_loc(nandc, 0, 0, data_size, 0);
+ nandc_set_read_loc(nandc, 1, data_size,
+ oob_size, 1);
+ }
} else if (data_buf) {
- nandc_set_read_loc(nandc, 0, 0, data_size, 1);
+ if (nandc->props->qpic_v2 && i == (ecc->steps - 1))
+ nandc_set_read_loc_last(nandc, 0, 0, data_size, 1);
+ else
+ nandc_set_read_loc(nandc, 0, 0, data_size, 1);
} else {
- nandc_set_read_loc(nandc, 0, data_size,
- oob_size, 1);
+ if (nandc->props->qpic_v2 && i == (ecc->steps - 1))
+ nandc_set_read_loc_last(nandc, 0, data_size,
+ oob_size, 1);
+ else
+ nandc_set_read_loc(nandc, 0, data_size,
+ oob_size, 1);
}
}

- config_nand_cw_read(nandc, true);
+ config_nand_cw_read(nandc, true, i == ecc->steps - 1 ? true : false);

if (data_buf)
read_data_dma(nandc, FLASH_BUF_ACC, data_buf,
@@ -1946,7 +2004,7 @@ static int copy_last_cw(struct qcom_nand_host *host, int page)
set_address(host, host->cw_size * (ecc->steps - 1), page);
update_rw_regs(host, 1, true);

- config_nand_single_cw_page_read(nandc, host->use_ecc);
+ config_nand_single_cw_page_read(nandc, host->use_ecc, true);

read_data_dma(nandc, FLASH_BUF_ACC, nandc->data_buffer, size, 0);

--
2.7.4