[PATCH v3 5/5] mtd: rawnand: qcom: Remove legacy interface

Md Sadre Alam
2023-05-31T12:50:41Z

This change will remove legacy interface implementation

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 pre_command() API definition completely.

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 | 359 ------------------------------
1 file changed, 359 deletions(-)

diff --git a/drivers/mtd/nand/raw/qcom_nandc.c b/drivers/mtd/nand/raw/qcom_nandc.c
index 7dc769f9e797..34448492b308 100644
--- a/drivers/mtd/nand/raw/qcom_nandc.c
+++ b/drivers/mtd/nand/raw/qcom_nandc.c
@@ -1303,155 +1303,6 @@ static void config_nand_cw_write(struct nand_chip *chip)
write_reg_dma(nandc, NAND_READ_STATUS, 1, NAND_BAM_NEXT_SGL);
}

-/*
- * the following functions are used within chip->legacy.cmdfunc() to
- * perform different NAND_CMD_* commands
- */
-
-/* sets up descriptors for NAND_CMD_PARAM */
-static int nandc_param(struct qcom_nand_host *host)
-{
- struct nand_chip *chip = &host->chip;
- struct qcom_nand_controller *nandc = get_qcom_nand_controller(chip);
-
- /*
- * NAND_CMD_PARAM is called before we know much about the FLASH chip
- * in use. we configure the controller to perform a raw read of 512
- * bytes to read onfi params
- */
- if (nandc->props->qpic_v2)
- nandc_set_reg(chip, NAND_FLASH_CMD, OP_PAGE_READ_ONFI_READ |
- PAGE_ACC | LAST_PAGE);
- else
- nandc_set_reg(chip, NAND_FLASH_CMD, OP_PAGE_READ |
- PAGE_ACC | LAST_PAGE);
-
- 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);
- }
-
- 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);
- write_reg_dma(nandc, NAND_DEV_CMD1, 1, NAND_BAM_NEXT_SGL);
- }
-
- nandc->buf_count = 512;
- 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);
- }
-
- return 0;
-}
-
-/* sets up descriptors for NAND_CMD_ERASE1 */
-static int erase_block(struct qcom_nand_host *host, int page_addr)
-{
- struct nand_chip *chip = &host->chip;
- struct qcom_nand_controller *nandc = get_qcom_nand_controller(chip);
-
- nandc_set_reg(chip, NAND_FLASH_CMD,
- OP_BLOCK_ERASE | PAGE_ACC | LAST_PAGE);
- nandc_set_reg(chip, NAND_ADDR0, page_addr);
- nandc_set_reg(chip, NAND_ADDR1, 0);
- 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);
- nandc_set_reg(chip, NAND_FLASH_STATUS, host->clrflashstatus);
- nandc_set_reg(chip, NAND_READ_STATUS, host->clrreadstatus);
-
- 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);
-
- read_reg_dma(nandc, NAND_FLASH_STATUS, 1, NAND_BAM_NEXT_SGL);
-
- write_reg_dma(nandc, NAND_FLASH_STATUS, 1, 0);
- write_reg_dma(nandc, NAND_READ_STATUS, 1, NAND_BAM_NEXT_SGL);
-
- return 0;
-}
-
-/* sets up descriptors for NAND_CMD_READID */
-static int read_id(struct qcom_nand_host *host, int column)
-{
- struct nand_chip *chip = &host->chip;
- struct qcom_nand_controller *nandc = get_qcom_nand_controller(chip);
-
- if (column == -1)
- return 0;
-
- nandc_set_reg(chip, NAND_FLASH_CMD, OP_FETCH_ID);
- nandc_set_reg(chip, NAND_ADDR0, column);
- nandc_set_reg(chip, NAND_ADDR1, 0);
- 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);
-
- return 0;
-}
-
-/* sets up descriptors for NAND_CMD_RESET */
-static int reset(struct qcom_nand_host *host)
-{
- struct nand_chip *chip = &host->chip;
- struct qcom_nand_controller *nandc = get_qcom_nand_controller(chip);
-
- nandc_set_reg(chip, NAND_FLASH_CMD, OP_RESET_DEVICE);
- 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);
-
- return 0;
-}
-
/* helpers to submit/free our list of dma descriptors */
static int submit_descs(struct qcom_nand_controller *nandc)
{
@@ -1534,150 +1385,6 @@ static void clear_read_regs(struct qcom_nand_controller *nandc)
nandc_read_buffer_sync(nandc, false);
}

-static void pre_command(struct qcom_nand_host *host, int command)
-{
- struct nand_chip *chip = &host->chip;
- struct qcom_nand_controller *nandc = get_qcom_nand_controller(chip);
-
- nandc->buf_count = 0;
- nandc->buf_start = 0;
- host->use_ecc = false;
- host->last_command = command;
-
- clear_read_regs(nandc);
-
- clear_bam_transaction(nandc);
-}
-
-/*
- * this is called after NAND_CMD_PAGEPROG and NAND_CMD_ERASE1 to set our
- * privately maintained status byte, this status byte can be read after
- * NAND_CMD_STATUS is called
- */
-static void parse_erase_write_errors(struct qcom_nand_host *host, int command)
-{
- struct nand_chip *chip = &host->chip;
- struct qcom_nand_controller *nandc = get_qcom_nand_controller(chip);
- struct nand_ecc_ctrl *ecc = &chip->ecc;
- int num_cw;
- int i;
-
- num_cw = command == NAND_CMD_PAGEPROG ? ecc->steps : 1;
- nandc_read_buffer_sync(nandc, true);
-
- for (i = 0; i < num_cw; i++) {
- u32 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;
- }
-}
-
-static void post_command(struct qcom_nand_host *host, int command)
-{
- struct nand_chip *chip = &host->chip;
- struct qcom_nand_controller *nandc = get_qcom_nand_controller(chip);
-
- switch (command) {
- case NAND_CMD_READID:
- nandc_read_buffer_sync(nandc, true);
- memcpy(nandc->data_buffer, nandc->reg_read_buf,
- nandc->buf_count);
- break;
- case NAND_CMD_PAGEPROG:
- case NAND_CMD_ERASE1:
- parse_erase_write_errors(host, command);
- break;
- default:
- break;
- }
-}
-
-/*
- * Implements chip->legacy.cmdfunc. It's only used for a limited set of
- * commands. The rest of the commands wouldn't be called by upper layers.
- * For example, NAND_CMD_READOOB would never be called because we have our own
- * versions of read_oob ops for nand_ecc_ctrl.
- */
-static void qcom_nandc_command(struct nand_chip *chip, unsigned int command,
- int column, int page_addr)
-{
- struct qcom_nand_host *host = to_qcom_nand_host(chip);
- struct nand_ecc_ctrl *ecc = &chip->ecc;
- struct qcom_nand_controller *nandc = get_qcom_nand_controller(chip);
- bool wait = false;
- int ret = 0;
-
- pre_command(host, command);
-
- switch (command) {
- case NAND_CMD_RESET:
- ret = reset(host);
- wait = true;
- break;
-
- case NAND_CMD_READID:
- nandc->buf_count = 4;
- ret = read_id(host, column);
- wait = true;
- break;
-
- case NAND_CMD_PARAM:
- ret = nandc_param(host);
- wait = true;
- break;
-
- case NAND_CMD_ERASE1:
- ret = erase_block(host, page_addr);
- wait = true;
- break;
-
- case NAND_CMD_READ0:
- /* we read the entire page for now */
- WARN_ON(column != 0);
-
- host->use_ecc = true;
- set_address(host, 0, page_addr);
- update_rw_regs(host, ecc->steps, true, 0);
- break;
-
- case NAND_CMD_SEQIN:
- WARN_ON(column != 0);
- set_address(host, 0, page_addr);
- break;
-
- case NAND_CMD_PAGEPROG:
- case NAND_CMD_STATUS:
- case NAND_CMD_NONE:
- default:
- break;
- }
-
- if (ret) {
- dev_err(nandc->dev, "failure executing command %d\n",
- command);
- free_descs(nandc);
- return;
- }
-
- if (wait) {
- ret = submit_descs(nandc);
- if (ret)
- dev_err(nandc->dev,
- "failure submitting descs for command %d\n",
- command);
- }
-
- free_descs(nandc);
-
- post_command(host, command);
-}
-
/*
* when using BCH ECC, the HW flags an error in NAND_FLASH_STATUS if it read
* an erased CW, and reports an erased CW in NAND_ERASED_CW_DETECT_STATUS.
@@ -2534,64 +2241,6 @@ static int qcom_nandc_block_markbad(struct nand_chip *chip, loff_t ofs)
return nand_prog_page_end_op(chip);
}

-/*
- * the three functions below implement chip->legacy.read_byte(),
- * chip->legacy.read_buf() and chip->legacy.write_buf() respectively. these
- * aren't used for reading/writing page data, they are used for smaller data
- * like reading id, status etc
- */
-static uint8_t qcom_nandc_read_byte(struct nand_chip *chip)
-{
- struct qcom_nand_host *host = to_qcom_nand_host(chip);
- struct qcom_nand_controller *nandc = get_qcom_nand_controller(chip);
- u8 *buf = nandc->data_buffer;
- u8 ret = 0x0;
-
- if (host->last_command == NAND_CMD_STATUS) {
- ret = host->status;
-
- host->status = NAND_STATUS_READY | NAND_STATUS_WP;
-
- return ret;
- }
-
- if (nandc->buf_start < nandc->buf_count)
- ret = buf[nandc->buf_start++];
-
- return ret;
-}
-
-static void qcom_nandc_read_buf(struct nand_chip *chip, uint8_t *buf, int len)
-{
- struct qcom_nand_controller *nandc = get_qcom_nand_controller(chip);
- int real_len = min_t(size_t, len, nandc->buf_count - nandc->buf_start);
-
- memcpy(buf, nandc->data_buffer + nandc->buf_start, real_len);
- nandc->buf_start += real_len;
-}
-
-static void qcom_nandc_write_buf(struct nand_chip *chip, const uint8_t *buf,
- int len)
-{
- struct qcom_nand_controller *nandc = get_qcom_nand_controller(chip);
- int real_len = min_t(size_t, len, nandc->buf_count - nandc->buf_start);
-
- memcpy(nandc->data_buffer + nandc->buf_start, buf, real_len);
-
- nandc->buf_start += real_len;
-}
-
-/* we support only one external chip for now */
-static void qcom_nandc_select_chip(struct nand_chip *chip, int chipnr)
-{
- struct qcom_nand_controller *nandc = get_qcom_nand_controller(chip);
-
- if (chipnr <= 0)
- return;
-
- dev_warn(nandc->dev, "invalid chip select\n");
-}
-
/*
* NAND controller page layout info
*
@@ -3698,14 +3347,6 @@ static int qcom_nand_host_init_and_register(struct qcom_nand_controller *nandc,
mtd->owner = THIS_MODULE;
mtd->dev.parent = dev;

- chip->legacy.cmdfunc = qcom_nandc_command;
- chip->legacy.select_chip = qcom_nandc_select_chip;
- chip->legacy.read_byte = qcom_nandc_read_byte;
- chip->legacy.read_buf = qcom_nandc_read_buf;
- chip->legacy.write_buf = qcom_nandc_write_buf;
- chip->legacy.set_features = nand_get_set_features_notsupp;
- chip->legacy.get_features = nand_get_set_features_notsupp;
-
/*
* the bad block marker is readable only when we read the last codeword
* of a page with ECC disabled. currently, the nand_base and nand_bbt