[PATCH v3 4/5] mtd: rawnand: qcom: Add support for read, write, erase exec_ops

Md Sadre Alam
2023-05-31T12:50:40Z

This change will add exec_ops support for READ, WRITE, and ERASE
command.

Co-developed-by: Sricharan Ramabadhran <quic_srichara@quicinc.com>
Signed-off-by: Sricharan Ramabadhran <quic_srichara@quicinc.com>
Signed-off-by: Md Sadre Alam <quic_mdalam@quicinc.com>
---
Change in [v3]

* Removed chip->cont_read.ongoing flag.

* Removed pre_command from erase_etype_exec_ops.

Change in [v2]

* Missed to post Cover-letter, so posting v2 patch with cover-letter.

Change in [v1]

* Added initial support for exec_ops.

drivers/mtd/nand/raw/qcom_nandc.c | 97 +++++++++++++++++++++++++++++--
1 file changed, 93 insertions(+), 4 deletions(-)

diff --git a/drivers/mtd/nand/raw/qcom_nandc.c b/drivers/mtd/nand/raw/qcom_nandc.c
index b4823b72fe73..7dc769f9e797 100644
--- a/drivers/mtd/nand/raw/qcom_nandc.c
+++ b/drivers/mtd/nand/raw/qcom_nandc.c
@@ -1546,8 +1546,7 @@ static void pre_command(struct qcom_nand_host *host, int command)

clear_read_regs(nandc);

- if (command == NAND_CMD_ERASE1)
- clear_bam_transaction(nandc);
+ clear_bam_transaction(nandc);
}

/*
@@ -1764,7 +1763,7 @@ qcom_nandc_read_cw_raw(struct mtd_info *mtd, struct nand_chip *chip,
int ret, reg_off = FLASH_BUF_ACC, read_loc = 0;
int raw_cw = cw;

- nand_read_page_op(chip, page, 0, NULL, 0);
+ nand_read_page_op(chip, page, 0, data_buf, mtd->writesize);
host->use_ecc = false;

if (nandc->props->qpic_v2)
@@ -2181,14 +2180,23 @@ static void qcom_nandc_codeword_fixup(struct qcom_nand_host *host, int page)
static int qcom_nandc_read_page(struct nand_chip *chip, uint8_t *buf,
int oob_required, int page)
{
+ struct mtd_info *mtd = nand_to_mtd(chip);
struct qcom_nand_host *host = to_qcom_nand_host(chip);
struct qcom_nand_controller *nandc = get_qcom_nand_controller(chip);
+ struct nand_ecc_ctrl *ecc = &chip->ecc;
u8 *data_buf, *oob_buf = NULL;

if (host->nr_boot_partitions)
qcom_nandc_codeword_fixup(host, page);

- nand_read_page_op(chip, page, 0, NULL, 0);
+ nand_read_page_op(chip, page, 0, buf, mtd->writesize);
+ nandc->buf_count = 0;
+ nandc->buf_start = 0;
+ host->use_ecc = true;
+ clear_read_regs(nandc);
+ set_address(host, 0, page);
+ update_rw_regs(host, ecc->steps, true, 0);
+
data_buf = buf;
oob_buf = oob_required ? chip->oob_poi : NULL;

@@ -2258,6 +2266,9 @@ static int qcom_nandc_write_page(struct nand_chip *chip, const uint8_t *buf,

nand_prog_page_begin_op(chip, page, 0, NULL, 0);

+ set_address(host, 0, page);
+ nandc->buf_count = 0;
+ nandc->buf_start = 0;
clear_read_regs(nandc);
clear_bam_transaction(nandc);

@@ -3274,6 +3285,67 @@ static int qcom_param_page_type_exec(struct nand_chip *chip, const struct nand_
return ret;
}

+static int qcom_erase_cmd_type_exec(struct nand_chip *chip, const struct nand_subop *subop)
+{
+ struct qcom_nand_host *host = to_qcom_nand_host(chip);
+ struct qcom_nand_controller *nandc = get_qcom_nand_controller(chip);
+ struct qcom_op q_op;
+ int ret = 0;
+
+ qcom_parse_instructions(chip, subop, &q_op);
+
+ q_op.cmd_reg |= PAGE_ACC | LAST_PAGE;
+
+ nandc->buf_count = 0;
+ nandc->buf_start = 0;
+ host->use_ecc = false;
+ clear_read_regs(nandc);
+ clear_bam_transaction(nandc);
+
+ nandc_set_reg(chip, NAND_FLASH_CMD, q_op.cmd_reg);
+ nandc_set_reg(chip, NAND_ADDR0, q_op.addr1_reg);
+ nandc_set_reg(chip, NAND_ADDR1, q_op.addr2_reg);
+ nandc_set_reg(chip, NAND_DEV0_CFG0,
+ host->cfg0_raw & ~(7 << CW_PER_PAGE));
+ nandc_set_reg(chip, NAND_DEV0_CFG1, host->cfg1_raw);
+ nandc_set_reg(chip, NAND_EXEC_CMD, 1);
+
+ write_reg_dma(nandc, NAND_FLASH_CMD, 3, NAND_BAM_NEXT_SGL);
+ write_reg_dma(nandc, NAND_DEV0_CFG0, 2, NAND_BAM_NEXT_SGL);
+ write_reg_dma(nandc, NAND_EXEC_CMD, 1, NAND_BAM_NEXT_SGL);
+
+ ret = submit_descs(nandc);
+ if (ret) {
+ dev_err(nandc->dev, "failure in sbumitting erase descriptor\n");
+ free_descs(nandc);
+ goto err_out;
+ }
+ free_descs(nandc);
+
+ ret = qcom_wait_rdy_poll(chip, q_op.rdy_timeout_ms);
+ if (ret)
+ goto err_out;
+
+err_out:
+ return ret;
+}
+
+static int qcom_data_read_type_exec(struct nand_chip *chip, const struct nand_subop *subop)
+{
+ /* currently read_exec_op() return 0 , and all the read operation handle in
+ * actual API itself
+ */
+ return 0;
+}
+
+static int qcom_data_write_type_exec(struct nand_chip *chip, const struct nand_subop *subop)
+{
+ /* currently write_exec_op() return 0, and all the write operation handle in
+ * actual API itself
+ */
+ return 0;
+}
+
static const struct nand_op_parser qcom_op_parser = NAND_OP_PARSER(
NAND_OP_PARSER_PATTERN(
qcom_misc_cmd_type_exec,
@@ -3294,6 +3366,23 @@ static const struct nand_op_parser qcom_op_parser = NAND_OP_PARSER(
NAND_OP_PARSER_PAT_ADDR_ELEM(false, MAX_ADDRESS_CYCLE),
NAND_OP_PARSER_PAT_WAITRDY_ELEM(true),
NAND_OP_PARSER_PAT_DATA_IN_ELEM(false, 512)),
+ NAND_OP_PARSER_PATTERN(
+ qcom_erase_cmd_type_exec,
+ NAND_OP_PARSER_PAT_CMD_ELEM(false),
+ NAND_OP_PARSER_PAT_ADDR_ELEM(false, MAX_ADDRESS_CYCLE),
+ NAND_OP_PARSER_PAT_CMD_ELEM(false),
+ NAND_OP_PARSER_PAT_WAITRDY_ELEM(false)),
+ NAND_OP_PARSER_PATTERN(
+ qcom_data_read_type_exec,
+ NAND_OP_PARSER_PAT_CMD_ELEM(false),
+ NAND_OP_PARSER_PAT_ADDR_ELEM(false, MAX_ADDRESS_CYCLE),
+ NAND_OP_PARSER_PAT_CMD_ELEM(false),
+ NAND_OP_PARSER_PAT_WAITRDY_ELEM(true),
+ NAND_OP_PARSER_PAT_DATA_IN_ELEM(false, 2048)),
+ NAND_OP_PARSER_PATTERN(
+ qcom_data_write_type_exec,
+ NAND_OP_PARSER_PAT_CMD_ELEM(true),
+ NAND_OP_PARSER_PAT_ADDR_ELEM(true, MAX_ADDRESS_CYCLE)),
);

static int qcom_check_op(struct nand_chip *chip,