[PATCH v2 2/5] mtd: rawnand: qcom: Add support for reset, readid, status exec_op

Md Sadre Alam
2023-05-11T13:31:12Z

This change will add exec_ops support for RESET , READ_ID, STATUS
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 [v2]

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

drivers/mtd/nand/raw/qcom_nandc.c | 166 +++++++++++++++++++++++++++++-
1 file changed, 163 insertions(+), 3 deletions(-)

diff --git a/drivers/mtd/nand/raw/qcom_nandc.c b/drivers/mtd/nand/raw/qcom_nandc.c
index dae460e2aa0b..d2f2a8971907 100644
--- a/drivers/mtd/nand/raw/qcom_nandc.c
+++ b/drivers/mtd/nand/raw/qcom_nandc.c
@@ -384,6 +384,9 @@ struct nandc_regs {
* @reg_read_pos: marker for data read in reg_read_buf
*
* @cmd1/vld: some fixed controller register values
+ *
+ * @exec_opwrite: flag to select correct number of code word
+ * while reading status
*/
struct qcom_nand_controller {
struct device *dev;
@@ -434,6 +437,7 @@ struct qcom_nand_controller {
int reg_read_pos;

u32 cmd1, vld;
+ bool exec_opwrite;
};

/*
@@ -2920,6 +2924,8 @@ static int qcom_op_cmd_mapping(struct qcom_nand_controller *nandc, u8 cmd,
break;
case NAND_CMD_PAGEPROG:
ret = OP_PROGRAM_PAGE;
+ q_op->flag = NAND_CMD_PAGEPROG;
+ nandc->exec_opwrite = true;
break;
default:
break;
@@ -2982,10 +2988,95 @@ static void qcom_parse_instructions(struct nand_chip *chip,
}
}

+static void qcom_delay_ns(unsigned int ns)
+{
+ if (!ns)
+ return;
+
+ if (ns < 10000)
+ ndelay(ns);
+ else
+ udelay(DIV_ROUND_UP(ns, 1000));
+}
+
+static int qcom_wait_rdy_poll(struct nand_chip *chip, unsigned int time_ms)
+{
+ struct qcom_nand_controller *nandc = get_qcom_nand_controller(chip);
+ unsigned long start = jiffies + msecs_to_jiffies(time_ms);
+ u32 flash;
+
+ nandc_read_buffer_sync(nandc, true);
+
+ do {
+ flash = le32_to_cpu(nandc->reg_read_buf[0]);
+ if (flash & FS_READY_BSY_N)
+ return 0;
+ cpu_relax();
+ } while (time_after(start, jiffies));
+
+ dev_err(nandc->dev, "Timeout waiting for device to be ready:0x%08x\n", flash);
+
+ return -ETIMEDOUT;
+}
+
static int qcom_read_status_exec(struct nand_chip *chip,
const struct nand_subop *subop)
{
- return 0;
+ 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;
+ struct qcom_op q_op;
+ const struct nand_op_instr *instr = NULL;
+ unsigned int op_id = 0;
+ unsigned int len = 0;
+ int ret = 0, num_cw = 1, i;
+ u32 flash_status;
+
+ host->status = NAND_STATUS_READY | NAND_STATUS_WP;
+
+ qcom_parse_instructions(chip, subop, &q_op);
+
+ if (nandc->exec_opwrite) {
+ num_cw = ecc->steps;
+ nandc->exec_opwrite = false;
+ }
+
+ pre_command(host, NAND_CMD_STATUS);
+
+ nandc_set_reg(chip, NAND_FLASH_CMD, q_op.cmd_reg);
+ nandc_set_reg(chip, NAND_EXEC_CMD, 1);
+
+ write_reg_dma(nandc, NAND_FLASH_CMD, 1, NAND_BAM_NEXT_SGL);
+ write_reg_dma(nandc, NAND_EXEC_CMD, 1, NAND_BAM_NEXT_SGL);
+
+ read_reg_dma(nandc, NAND_FLASH_STATUS, 1, NAND_BAM_NEXT_SGL);
+
+ ret = submit_descs(nandc);
+ if (ret)
+ dev_err(nandc->dev, "failure in sbumitting status descriptor\n");
+
+ free_descs(nandc);
+
+ nandc_read_buffer_sync(nandc, true);
+ for (i = 0; i < num_cw; i++) {
+ flash_status = le32_to_cpu(nandc->reg_read_buf[i]);
+
+ if (flash_status & FS_MPU_ERR)
+ host->status &= ~NAND_STATUS_WP;
+
+ if (flash_status & FS_OP_ERR || (i == (num_cw - 1) &&
+ (flash_status & FS_DEVICE_STS_ERR)))
+ host->status |= NAND_STATUS_FAIL;
+ }
+
+ flash_status = host->status;
+
+ instr = q_op.data_instr;
+ op_id = q_op.data_instr_idx;
+ len = nand_subop_get_data_len(subop, op_id);
+ memcpy(instr->ctx.data.buf.in, &flash_status, len);
+
+ return ret;
}

static int qcom_erase_cmd_type_exec(struct nand_chip *chip, const struct nand_subop *subop)
@@ -3000,12 +3091,81 @@ static int qcom_param_page_type_exec(struct nand_chip *chip, const struct nand_

static int qcom_read_id_type_exec(struct nand_chip *chip, const struct nand_subop *subop)
{
- return 0;
+ struct qcom_nand_controller *nandc = get_qcom_nand_controller(chip);
+ struct qcom_nand_host *host = to_qcom_nand_host(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);
+
+ pre_command(host, NAND_CMD_READID);
+
+ 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_FLASH_CHIP_SELECT,
+ nandc->props->is_bam ? 0 : DM_EN);
+
+ nandc_set_reg(chip, NAND_EXEC_CMD, 1);
+
+ write_reg_dma(nandc, NAND_FLASH_CMD, 4, NAND_BAM_NEXT_SGL);
+ write_reg_dma(nandc, NAND_EXEC_CMD, 1, NAND_BAM_NEXT_SGL);
+
+ read_reg_dma(nandc, NAND_READ_ID, 1, NAND_BAM_NEXT_SGL);
+
+ ret = submit_descs(nandc);
+ if (ret)
+ dev_err(nandc->dev, "failure in sbumitting read id descriptor\n");
+
+ free_descs(nandc);
+
+ instr = q_op.data_instr;
+ op_id = q_op.data_instr_idx;
+ len = nand_subop_get_data_len(subop, op_id);
+
+ nandc_read_buffer_sync(nandc, true);
+ memcpy(instr->ctx.data.buf.in, nandc->reg_read_buf, len);
+
+ return ret;
}

static int qcom_misc_cmd_type_exec(struct nand_chip *chip, const struct nand_subop *subop)
{
- return 0;
+ struct qcom_nand_controller *nandc = get_qcom_nand_controller(chip);
+ struct qcom_nand_host *host = to_qcom_nand_host(chip);
+ struct qcom_op q_op;
+ int ret = 0;
+
+ qcom_parse_instructions(chip, subop, &q_op);
+
+ if (q_op.flag == NAND_CMD_PAGEPROG)
+ goto wait_rdy;
+
+ pre_command(host, NAND_CMD_RESET);
+
+ nandc_set_reg(chip, NAND_FLASH_CMD, q_op.cmd_reg);
+ nandc_set_reg(chip, NAND_EXEC_CMD, 1);
+
+ write_reg_dma(nandc, NAND_FLASH_CMD, 1, NAND_BAM_NEXT_SGL);
+ write_reg_dma(nandc, NAND_EXEC_CMD, 1, NAND_BAM_NEXT_SGL);
+
+ read_reg_dma(nandc, NAND_FLASH_STATUS, 1, NAND_BAM_NEXT_SGL);
+
+ ret = submit_descs(nandc);
+ if (ret)
+ dev_err(nandc->dev, "failure in sbumitting misc descriptor\n");
+
+ free_descs(nandc);
+
+wait_rdy:
+ qcom_delay_ns(q_op.rdy_delay_ns);
+
+ ret = qcom_wait_rdy_poll(chip, q_op.rdy_timeout_ms);
+
+ return ret;
}

static int qcom_data_read_type_exec(struct nand_chip *chip, const struct nand_subop *subop)
--
2.17.1