[PATCH v4 3/5] mtd: rawnand: qcom: Add support for param_page read exec_ops

[Md Sadre Alam]

Add support for PARAM_PAGE_READ exec_ops.

Co-developed-by: Sricharan Ramabadhran <quic_srichara at quicinc.com>
Signed-off-by: Sricharan Ramabadhran <quic_srichara at quicinc.com>
Signed-off-by: Md Sadre Alam <quic_mdalam at quicinc.com>
---
Change in [v4]

* Updated commit message

* Fix spelling mistake of sbumitting to submitting  

Change in [v3]

* Removed hard coded value in param_page exec_op API, and used whatever
  passed by core.

* Removed nandc->props->qpic_v2 condition , since its not needed at all.

* Updated nandc->buf_count = len , len provided by core.

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 | 105 +++++++++++++++++++++++++++++-
 1 file changed, 104 insertions(+), 1 deletion(-)

diff --git a/drivers/mtd/nand/raw/qcom_nandc.c b/drivers/mtd/nand/raw/qcom_nandc.c
index 4d4b95117051..7b42b1e3cf33 100644
--- a/drivers/mtd/nand/raw/qcom_nandc.c
+++ b/drivers/mtd/nand/raw/qcom_nandc.c
@@ -1546,7 +1546,7 @@ static void pre_command(struct qcom_nand_host *host, int command)
 
 	clear_read_regs(nandc);
 
-	if (command == NAND_CMD_PARAM || command == NAND_CMD_ERASE1)
+	if (command == NAND_CMD_ERASE1)
 		clear_bam_transaction(nandc);
 }
 
@@ -3177,6 +3177,103 @@ static int qcom_misc_cmd_type_exec(struct nand_chip *chip, const struct nand_sub
 	return ret;
 }
 
+static int qcom_param_page_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;
+	const struct nand_op_instr *instr = NULL;
+	unsigned int op_id = 0;
+	unsigned int len = 0;
+	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, 0);
+	nandc_set_reg(chip, NAND_ADDR1, 0);
+	nandc_set_reg(chip, NAND_DEV0_CFG0, 0 << CW_PER_PAGE
+					| 512 << UD_SIZE_BYTES
+					| 5 << NUM_ADDR_CYCLES
+					| 0 << SPARE_SIZE_BYTES);
+	nandc_set_reg(chip, NAND_DEV0_CFG1, 7 << NAND_RECOVERY_CYCLES
+					| 0 << CS_ACTIVE_BSY
+					| 17 << BAD_BLOCK_BYTE_NUM
+					| 1 << BAD_BLOCK_IN_SPARE_AREA
+					| 2 << WR_RD_BSY_GAP
+					| 0 << WIDE_FLASH
+					| 1 << DEV0_CFG1_ECC_DISABLE);
+	if (!nandc->props->qpic_v2)
+		nandc_set_reg(chip, NAND_EBI2_ECC_BUF_CFG, 1 << ECC_CFG_ECC_DISABLE);
+
+	/* configure CMD1 and VLD for ONFI param probing in QPIC v1 */
+	if (!nandc->props->qpic_v2) {
+		nandc_set_reg(chip, NAND_DEV_CMD_VLD,
+			      (nandc->vld & ~READ_START_VLD));
+		nandc_set_reg(chip, NAND_DEV_CMD1,
+			      (nandc->cmd1 & ~(0xFF << READ_ADDR))
+			      | NAND_CMD_PARAM << READ_ADDR);
+	}
+
+	nandc_set_reg(chip, NAND_EXEC_CMD, 1);
+
+	if (!nandc->props->qpic_v2) {
+		nandc_set_reg(chip, NAND_DEV_CMD1_RESTORE, nandc->cmd1);
+		nandc_set_reg(chip, NAND_DEV_CMD_VLD_RESTORE, nandc->vld);
+	}
+
+	instr = q_op.data_instr;
+	op_id = q_op.data_instr_idx;
+	len = nand_subop_get_data_len(subop, op_id);
+
+	nandc_set_read_loc(chip, 0, 0, 0, len, 1);
+
+	if (!nandc->props->qpic_v2) {
+		write_reg_dma(nandc, NAND_DEV_CMD_VLD, 1, 0);
+		write_reg_dma(nandc, NAND_DEV_CMD1, 1, NAND_BAM_NEXT_SGL);
+	}
+
+	nandc->buf_count = len;
+	memset(nandc->data_buffer, 0xff, nandc->buf_count);
+
+	config_nand_single_cw_page_read(chip, false, 0);
+
+	read_data_dma(nandc, FLASH_BUF_ACC, nandc->data_buffer,
+		      nandc->buf_count, 0);
+
+	/* restore CMD1 and VLD regs */
+	if (!nandc->props->qpic_v2) {
+		write_reg_dma(nandc, NAND_DEV_CMD1_RESTORE, 1, 0);
+		write_reg_dma(nandc, NAND_DEV_CMD_VLD_RESTORE, 1, NAND_BAM_NEXT_SGL);
+	}
+
+	ret = submit_descs(nandc);
+	if (ret) {
+		dev_err(nandc->dev, "failure in submitting param page 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;
+
+	memcpy(instr->ctx.data.buf.in, nandc->data_buffer, len);
+
+err_out:
+	return ret;
+}
+
 static const struct nand_op_parser qcom_op_parser = NAND_OP_PARSER(
 		NAND_OP_PARSER_PATTERN(
 			qcom_misc_cmd_type_exec,
@@ -3191,6 +3288,12 @@ static const struct nand_op_parser qcom_op_parser = NAND_OP_PARSER(
 			qcom_read_status_exec,
 			NAND_OP_PARSER_PAT_CMD_ELEM(false),
 			NAND_OP_PARSER_PAT_DATA_IN_ELEM(false, 1)),
+		NAND_OP_PARSER_PATTERN(
+			qcom_param_page_type_exec,
+			NAND_OP_PARSER_PAT_CMD_ELEM(false),
+			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)),
 		);
 
 static int qcom_check_op(struct nand_chip *chip,
-- 
2.17.1