Message-Id: <1654273498-31998-1-git-send-email-quic_mdalam@quicinc.com>
Date:   Fri,  3 Jun 2022 21:54:58 +0530
From:   Md Sadre Alam <quic_mdalam@...cinc.com>
To:     mani@...nel.org, miquel.raynal@...tlin.com, richard@....at,
        vigneshr@...com, linux-mtd@...ts.infradead.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     quic_srichara@...cinc.com, quic_mdalam@...cinc.com
Subject: [PATCH] mtd: rawnand: qcom: Implement exec_op()

Implement exec_op() so we can later get rid of the legacy interface
implementation.

Co-developed-by: Sricharan R <quic_srichara@...cinc.com>
Signed-off-by: Sricharan R <quic_srichara@...cinc.com>
Signed-off-by: Md Sadre Alam <quic_mdalam@...cinc.com>
---
 drivers/mtd/nand/raw/qcom_nandc.c | 368 +++++++++++++++++++++-----------------
 1 file changed, 204 insertions(+), 164 deletions(-)

diff --git a/drivers/mtd/nand/raw/qcom_nandc.c b/drivers/mtd/nand/raw/qcom_nandc.c
index 048b255..507921b 100644
--- a/drivers/mtd/nand/raw/qcom_nandc.c
+++ b/drivers/mtd/nand/raw/qcom_nandc.c
@@ -14,6 +14,7 @@
 #include <linux/of.h>
 #include <linux/of_device.h>
 #include <linux/delay.h>
+#include <linux/iopoll.h>
 #include <linux/dma/qcom_bam_dma.h>
 
 /* NANDc reg offsets */
@@ -1305,15 +1306,13 @@ static int nandc_param(struct qcom_nand_host *host)
 }
 
 /* sets up descriptors for NAND_CMD_ERASE1 */
-static int erase_block(struct qcom_nand_host *host, int page_addr)
+static int erase_block(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_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);
@@ -1321,14 +1320,8 @@ static int erase_block(struct qcom_nand_host *host, int page_addr)
 	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_FLASH_CMD, 1, 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;
 }
@@ -1343,16 +1336,12 @@ static int read_id(struct qcom_nand_host *host, int column)
 		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);
+	write_reg_dma(nandc, NAND_FLASH_CMD, 1, NAND_BAM_NEXT_SGL);
+	write_reg_dma(nandc, NAND_FLASH_CHIP_SELECT, 1, NAND_BAM_NEXT_SGL);
 
 	return 0;
 }
@@ -1491,7 +1480,6 @@ static void parse_erase_write_errors(struct qcom_nand_host *host, int command)
 
 	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;
 
@@ -1523,86 +1511,6 @@ static void post_command(struct qcom_nand_host *host, int command)
 }
 
 /*
- * 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.
  *
@@ -2044,7 +1952,6 @@ static int qcom_nandc_read_page(struct nand_chip *chip, uint8_t *buf,
 	struct qcom_nand_host *host = to_qcom_nand_host(chip);
 	struct qcom_nand_controller *nandc = get_qcom_nand_controller(chip);
 	u8 *data_buf, *oob_buf = NULL;
-
 	nand_read_page_op(chip, page, 0, NULL, 0);
 	data_buf = buf;
 	oob_buf = oob_required ? chip->oob_poi : NULL;
@@ -2366,64 +2273,6 @@ static int qcom_nandc_block_markbad(struct nand_chip *chip, loff_t ofs)
 }
 
 /*
- * 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
  *
  * Layout with ECC enabled:
@@ -2738,8 +2587,207 @@ static int qcom_nand_attach_chip(struct nand_chip *chip)
 	return 0;
 }
 
+static int nandc_status(struct nand_chip *chip)
+{
+	struct qcom_nand_controller *nandc = get_qcom_nand_controller(chip);
+	struct qcom_nand_host *host = to_qcom_nand_host(chip);
+
+	memcpy(nandc->data_buffer, &host->status, 1);
+
+	return 0;
+}
+
+static int qcom_nand_send_command(struct nand_chip *chip, u8 command)
+{
+	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;
+
+	int ret = 0;
+
+	pre_command(host, command);
+
+	switch (command) {
+	case NAND_CMD_RESET:
+		ret = reset(host);
+		break;
+	case NAND_CMD_READID:
+		nandc->buf_count = 4;
+		ret = read_id(host, 0);
+		break;
+	case NAND_CMD_PARAM:
+		ret = nandc_param(host);
+		break;
+	case NAND_CMD_ERASE1:
+		ret = erase_block(host);
+		break;
+	case NAND_CMD_STATUS:
+		ret = nandc_status(chip);
+		break;
+	case NAND_CMD_READ0:
+		host->use_ecc = true;
+		update_rw_regs(host, ecc->steps, true, 0);
+		break;
+	case NAND_CMD_ERASE2:
+		break;
+	case NAND_CMD_SEQIN:
+		break;
+	case NAND_CMD_PAGEPROG:
+		break;
+	default:
+		break;
+	}
+
+	return ret;
+}
+
+static int qcom_nand_send_address(struct nand_chip *chip,
+				  const struct nand_op_instr *instr, int cmd)
+{
+	struct qcom_nand_controller *nandc = get_qcom_nand_controller(chip);
+	u32 page_addr = 0x0, page_mask = 0x0;
+
+	page_addr = instr->ctx.addr.addrs[0];
+
+	/*
+	 *Form page address for erase, read, write to using existing api
+	 */
+
+	switch (cmd) {
+	case NAND_CMD_ERASE1:
+		page_addr = instr->ctx.addr.addrs[0];
+		page_mask = instr->ctx.addr.addrs[1];
+		page_mask <<= 8;
+		page_addr = (page_addr | page_mask);
+		page_mask = instr->ctx.addr.addrs[2];
+		page_mask <<= 16;
+		page_addr = (page_addr | page_mask);
+		page_mask = instr->ctx.addr.addrs[3];
+		page_mask <<= 24;
+		page_addr = (page_addr | page_mask);
+		break;
+	case NAND_CMD_READ0:
+	case NAND_CMD_SEQIN:
+		page_addr = instr->ctx.addr.addrs[3];
+		page_addr <<= 24;
+		page_mask = instr->ctx.addr.addrs[2];
+		page_mask <<= 16;
+		page_addr |= page_mask;
+		page_mask = instr->ctx.addr.addrs[1];
+		page_mask <<= 8;
+		page_addr |= page_mask;
+		page_mask = instr->ctx.addr.addrs[0];
+		page_addr |= page_mask;
+		break;
+	default:
+		break;
+	}
+
+	if (cmd == NAND_CMD_PARAM)
+		return 0;
+
+	nandc_set_reg(chip, NAND_ADDR0, page_addr);
+	nandc_set_reg(chip, NAND_ADDR1, 0);
+
+	if (cmd != NAND_CMD_SEQIN)
+		write_reg_dma(nandc, NAND_ADDR0, 2, 0);
+
+	return 0;
+}
+
+static void qcom_nand_read_buf(struct nand_chip *chip, u8 *buf, int len)
+{
+	struct qcom_nand_controller *nandc = get_qcom_nand_controller(chip);
+
+	memcpy(buf, nandc->data_buffer, len);
+}
+
+static int qcom_nand_exec_instr(struct nand_chip *chip,
+				const struct nand_op_instr *instr)
+{
+	struct qcom_nand_controller *nandc = get_qcom_nand_controller(chip);
+	struct qcom_nand_host *host = to_qcom_nand_host(chip);
+	u32 status;
+	int ret = 0;
+	bool wait = false;
+	static int opcode;
+
+	switch (instr->type) {
+	case NAND_OP_CMD_INSTR:
+		ret = qcom_nand_send_command(chip, instr->ctx.cmd.opcode);
+		if (instr->ctx.cmd.opcode == NAND_CMD_RESET)
+			wait = true;
+		opcode = instr->ctx.cmd.opcode;
+		break;
+	case NAND_OP_ADDR_INSTR:
+		qcom_nand_send_address(chip, instr, opcode);
+		if (opcode != NAND_CMD_READ0 && opcode != NAND_CMD_READSTART &&
+		    opcode != NAND_CMD_PARAM && opcode != NAND_CMD_SEQIN)
+			wait = true;
+		break;
+	case NAND_OP_DATA_IN_INSTR:
+		qcom_nand_read_buf(chip, instr->ctx.data.buf.in, instr->ctx.data.len);
+		break;
+	case NAND_OP_DATA_OUT_INSTR:
+		wait = false;
+		break;
+	case NAND_OP_WAITRDY_INSTR:
+		ret = readl_poll_timeout(nandc->base + NAND_FLASH_STATUS, status,
+					 (status & FS_READY_BSY_N), 20,
+					 instr->ctx.waitrdy.timeout_ms * 1000);
+		if (opcode == NAND_CMD_PARAM)
+			wait = true;
+	default:
+		break;
+	}
+
+	if (wait) {
+		if (opcode != NAND_CMD_PARAM)
+			write_reg_dma(nandc, NAND_EXEC_CMD, 1, NAND_BAM_NEXT_SGL);
+
+		if (opcode == NAND_CMD_READID)
+			read_reg_dma(nandc, NAND_READ_ID, 1, NAND_BAM_NEXT_SGL);
+
+		if (opcode == NAND_CMD_ERASE1) {
+			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);
+		}
+
+		ret = submit_descs(nandc);
+		if (ret)
+			dev_err(nandc->dev, "failure submitting descs for command 0x%02x\n",
+				opcode);
+
+		free_descs(nandc);
+		post_command(host, opcode);
+	}
+
+	return ret;
+}
+
+static int qcom_nand_exec_op(struct nand_chip *chip,
+			     const struct nand_operation *op,
+				bool check_only)
+{
+	unsigned int i;
+	int ret = 0;
+
+	if (check_only)
+		return 0;
+
+	for (i = 0; i < op->ninstrs; i++) {
+		ret = qcom_nand_exec_instr(chip, &op->instrs[i]);
+		if (ret)
+			break;
+	}
+
+	return ret;
+}
+
 static const struct nand_controller_ops qcom_nandc_ops = {
 	.attach_chip = qcom_nand_attach_chip,
+	.exec_op = qcom_nand_exec_op,
 };
 
 static void qcom_nandc_unalloc(struct qcom_nand_controller *nandc)
@@ -2938,14 +2986,6 @@ 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
-- 
2.7.4

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