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From: Md Sadre Alam <quic_mdalam@quicinc.com>
To: andersson@kernel.org, konrad.dybcio@linaro.org, broonie@kernel.org,
        robh@kernel.org, krzysztof.kozlowski+dt@linaro.org,
        conor+dt@kernel.org, miquel.raynal@bootlin.com, richard@nod.at,
        vigneshr@ti.com, manivannan.sadhasivam@linaro.org,
        neil.armstrong@linaro.org, daniel@makrotopia.org, arnd@arndb.de,
        chris.packham@alliedtelesis.co.nz, christophe.kerello@foss.st.com,
        linux-arm-msm@vger.kernel.org, linux-spi@vger.kernel.org,
        devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-mtd@lists.infradead.org
Cc: quic_srichara@quicinc.com, quic_varada@quicinc.com,
        quic_mdalam@quicinc.com
Subject: [PATCH v4 3/5] spi: spi-qpic: Add qpic spi nand driver support
Date: Fri,  8 Mar 2024 14:47:50 +0530
Message-Id: <20240308091752.16136-4-quic_mdalam@quicinc.com>
In-Reply-To: <20240308091752.16136-1-quic_mdalam@quicinc.com>
References: <20240308091752.16136-1-quic_mdalam@quicinc.com>
Precedence: bulk
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit

Add qpic spi nand driver support. The spi nand
driver currently supported the below commands.

-- RESET
-- READ ID
-- SET FEATURE
-- GET FEATURE
-- READ PAGE
-- WRITE PAGE
-- ERASE PAGE

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

* No change

Change in [v3]

* Set SPI_QPIC_SNAND to n and added COMPILE_TEST in Kconfig

* Made driver name sorted in Make file

* Made comment like c++

* Changed macro to functions, snandc_set_read_loc_last()
  and snandc_set_read_loc_first()

* Added error handling in snandc_set_reg()

* Changed into normal conditional statement for
  return snandc->ecc_stats.failed ? -EBADMSG :
  snandc->ecc_stats.bitflips;

* Remove cast of wbuf in qpic_snand_program_execute()
  function

* Made num_cw variable instead hardcoded value

* changed if..else condition of function qpic_snand_io_op()
  to switch..case statement

* Added __devm_spi_alloc_controller() api instead of
  devm_spi_alloc_master()

* Disabling clock in remove path

Change in [v2]

* Added initial support for SPI-NAND driver

Change in [v1]

* Added RFC patch for design review

 drivers/mtd/nand/qpic_common.c       |    8 +
 drivers/spi/Kconfig                  |    8 +
 drivers/spi/Makefile                 |    1 +
 drivers/spi/spi-qpic-snand.c         | 1041 ++++++++++++++++++++++++++
 include/linux/mtd/nand-qpic-common.h |   61 ++
 5 files changed, 1119 insertions(+)
 create mode 100644 drivers/spi/spi-qpic-snand.c

diff --git a/drivers/mtd/nand/qpic_common.c b/drivers/mtd/nand/qpic_common.c
index 5b7c0d119d9a..67ccb3d05f20 100644
--- a/drivers/mtd/nand/qpic_common.c
+++ b/drivers/mtd/nand/qpic_common.c
@@ -134,6 +134,14 @@ __le32 *qcom_offset_to_nandc_reg(struct nandc_regs *regs, int offset)
 		return &regs->read_location_last2;
 	case NAND_READ_LOCATION_LAST_CW_3:
 		return &regs->read_location_last3;
+	case NAND_FLASH_SPI_CFG:
+		return &regs->spi_cfg;
+	case NAND_NUM_ADDR_CYCLES:
+		return &regs->num_addr_cycle;
+	case NAND_BUSY_CHECK_WAIT_CNT:
+		return &regs->busy_wait_cnt;
+	case NAND_FLASH_FEATURES:
+		return &regs->flash_feature;
 	default:
 		return NULL;
 	}
diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index bc7021da2fe9..63764e943d82 100644
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -882,6 +882,14 @@ config SPI_QCOM_QSPI
 	help
 	  QSPI(Quad SPI) driver for Qualcomm QSPI controller.
 
+config SPI_QPIC_SNAND
+	tristate "QPIC SNAND controller"
+	depends on ARCH_QCOM || COMPILE_TEST
+	help
+	  QPIC_SNAND (QPIC SPI NAND) driver for Qualcomm QPIC controller.
+	  QPIC controller supports both parallel nand and serial nand.
+	  This config will enable serial nand driver for QPIC controller.
+
 config SPI_QUP
 	tristate "Qualcomm SPI controller with QUP interface"
 	depends on ARCH_QCOM || COMPILE_TEST
diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile
index 4ff8d725ba5e..9015368f8c73 100644
--- a/drivers/spi/Makefile
+++ b/drivers/spi/Makefile
@@ -111,6 +111,7 @@ obj-$(CONFIG_SPI_PXA2XX)		+= spi-pxa2xx-platform.o
 obj-$(CONFIG_SPI_PXA2XX_PCI)		+= spi-pxa2xx-pci.o
 obj-$(CONFIG_SPI_QCOM_GENI)		+= spi-geni-qcom.o
 obj-$(CONFIG_SPI_QCOM_QSPI)		+= spi-qcom-qspi.o
+obj-$(CONFIG_SPI_QPIC_SNAND)            += spi-qpic-snand.o
 obj-$(CONFIG_SPI_QUP)			+= spi-qup.o
 obj-$(CONFIG_SPI_ROCKCHIP)		+= spi-rockchip.o
 obj-$(CONFIG_SPI_ROCKCHIP_SFC)		+= spi-rockchip-sfc.o
diff --git a/drivers/spi/spi-qpic-snand.c b/drivers/spi/spi-qpic-snand.c
new file mode 100644
index 000000000000..df7d5d8d4db2
--- /dev/null
+++ b/drivers/spi/spi-qpic-snand.c
@@ -0,0 +1,1041 @@
+/*
+ * SPDX-License-Identifier: GPL-2.0
+ *
+ * Copyright (c) 2023, Qualcomm Innovation Center, Inc. All rights reserved.
+ *
+ * Authors:
+ *	Md Sadre Alam <quic_mdalam@quicinc.com>
+ *	Sricharan R <quic_srichara@quicinc.com>
+ *	Varadarajan Narayanan <quic_varada@quicinc.com>
+ */
+
+#include <linux/mtd/spinand.h>
+#include <linux/mtd/nand-qpic-common.h>
+
+/* QSPI NAND config reg bits */
+#define LOAD_CLK_CNTR_INIT_EN   BIT(28)
+#define CLK_CNTR_INIT_VAL_VEC   0x924
+#define FEA_STATUS_DEV_ADDR     0xc0
+#define SPI_CFG			BIT(0)
+#define SPI_NUM_ADDR		0xDA4DB
+#define SPI_WAIT_CNT		0x10
+#define QPIC_QSPI_NUM_CS	1
+#define SPI_TRANSFER_MODE_x1	BIT(29)
+#define SPI_TRANSFER_MODE_x4	(3 << 29)
+#define SPI_WP			BIT(28)
+#define SPI_HOLD		BIT(27)
+#define QPIC_SET_FEATURE	BIT(31)
+
+#define SPINAND_RESET		0xff
+#define SPINAND_READID		0x9f
+#define SPINAND_GET_FEATURE	0x0f
+#define SPINAND_SET_FEATURE	0x1f
+#define SPINAND_READ		0x13
+#define SPINAND_ERASE		0xd8
+#define SPINAND_WRITE_EN	0x06
+#define SPINAND_PROGRAM_EXECUTE	0x10
+#define SPINAND_PROGRAM_LOAD	0x84
+
+struct qpic_snand_op {
+	u32 cmd_reg;
+	u32 addr1_reg;
+	u32 addr2_reg;
+};
+
+struct snandc_read_status {
+	__le32 snandc_flash;
+	__le32 snandc_buffer;
+	__le32 snandc_erased_cw;
+};
+
+static void snandc_set_reg(struct qcom_nand_controller *snandc, int offset, u32 val)
+{
+	struct nandc_regs *regs = snandc->regs;
+	__le32 *reg;
+
+	reg = qcom_offset_to_nandc_reg(regs, offset);
+
+	if (reg)
+		*reg = cpu_to_le32(val);
+
+	if (WARN_ON(!reg))
+		return;
+}
+
+static void snandc_set_read_loc_first(struct qcom_nand_controller *snandc,
+				      int reg, int cw_offset, int read_size,
+				      int is_last_read_loc)
+{
+	snandc_set_reg(snandc, reg, ((cw_offset) << READ_LOCATION_OFFSET) |
+		       ((read_size) << READ_LOCATION_SIZE) | ((is_last_read_loc)
+			       << READ_LOCATION_LAST));
+}
+
+static void snandc_set_read_loc_last(struct qcom_nand_controller *snandc,
+				     int reg, int cw_offset, int read_size,
+				     int is_last_read_loc)
+{
+	snandc_set_reg(snandc, reg, ((cw_offset) << READ_LOCATION_OFFSET) |
+		       ((read_size) << READ_LOCATION_SIZE) | ((is_last_read_loc)
+			       << READ_LOCATION_LAST));
+}
+
+static struct qcom_nand_controller *nand_to_qcom_snand(struct nand_device *nand)
+{
+	struct nand_ecc_engine *eng = nand->ecc.engine;
+
+	return container_of(eng, struct qcom_nand_controller, ecc_eng);
+}
+
+static int qcom_snand_init(struct qcom_nand_controller *snandc)
+{
+	u32 snand_cfg_val = 0x0;
+	int ret;
+
+	snand_cfg_val |= (LOAD_CLK_CNTR_INIT_EN | (CLK_CNTR_INIT_VAL_VEC << 16)
+			| (FEA_STATUS_DEV_ADDR << 8) | SPI_CFG);
+
+	snandc_set_reg(snandc, NAND_FLASH_SPI_CFG, 0);
+	snandc_set_reg(snandc, NAND_FLASH_SPI_CFG, snand_cfg_val);
+	snandc_set_reg(snandc, NAND_NUM_ADDR_CYCLES, SPI_NUM_ADDR);
+	snandc_set_reg(snandc, NAND_BUSY_CHECK_WAIT_CNT, SPI_WAIT_CNT);
+
+	qcom_write_reg_dma(snandc, NAND_FLASH_SPI_CFG, 1, 0);
+	qcom_write_reg_dma(snandc, NAND_FLASH_SPI_CFG, 1, 0);
+
+	snand_cfg_val &= ~LOAD_CLK_CNTR_INIT_EN;
+	snandc_set_reg(snandc, NAND_FLASH_SPI_CFG, snand_cfg_val);
+
+	qcom_write_reg_dma(snandc, NAND_FLASH_SPI_CFG, 1, 0);
+
+	qcom_write_reg_dma(snandc, NAND_NUM_ADDR_CYCLES, 1, 0);
+	qcom_write_reg_dma(snandc, NAND_BUSY_CHECK_WAIT_CNT, 1, NAND_BAM_NEXT_SGL);
+
+	ret = qcom_submit_descs(snandc);
+	if (ret)
+		dev_err(snandc->dev, "failure in sbumitting spiinit descriptor\n");
+
+	return 0;
+}
+
+static int qcom_snand_ooblayout_ecc(struct mtd_info *mtd, int section,
+				    struct mtd_oob_region *oobregion)
+{
+	struct nand_device *nand = mtd_to_nanddev(mtd);
+	struct qcom_nand_controller *snandc = nand_to_qcom_snand(nand);
+	struct qpic_ecc *qecc = snandc->ecc;
+
+	if (section > 1)
+		return -ERANGE;
+
+	if (!section) {
+		oobregion->length = (qecc->bytes * (qecc->steps - 1)) + qecc->bbm_size;
+		oobregion->offset = 0;
+	} else {
+		oobregion->length = qecc->ecc_bytes_hw + qecc->spare_bytes;
+		oobregion->offset = mtd->oobsize - oobregion->length;
+	}
+
+	return 0;
+}
+
+static int qcom_snand_ooblayout_free(struct mtd_info *mtd, int section,
+				     struct mtd_oob_region *oobregion)
+{
+	struct nand_device *nand = mtd_to_nanddev(mtd);
+	struct qcom_nand_controller *snandc = nand_to_qcom_snand(nand);
+	struct qpic_ecc *qecc = snandc->ecc;
+
+	if (section)
+		return -ERANGE;
+
+	oobregion->length = qecc->steps * 4;
+	oobregion->offset = ((qecc->steps - 1) * qecc->bytes) + qecc->bbm_size;
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops qcom_snand_ooblayout = {
+	.ecc = qcom_snand_ooblayout_ecc,
+	.free = qcom_snand_ooblayout_free,
+};
+
+static int qpic_snand_ecc_init_ctx_pipelined(struct nand_device *nand)
+{
+	struct qcom_nand_controller *snandc = nand_to_qcom_snand(nand);
+	struct nand_ecc_props *conf = &nand->ecc.ctx.conf;
+	struct nand_ecc_props *reqs = &nand->ecc.requirements;
+	struct nand_ecc_props *user = &nand->ecc.user_conf;
+	struct mtd_info *mtd = nanddev_to_mtd(nand);
+	int step_size = 0, strength = 0, steps;
+	int cwperpage, bad_block_byte;
+	struct qpic_ecc *ecc_cfg;
+
+	cwperpage = mtd->writesize / NANDC_STEP_SIZE;
+	snandc->num_cw = cwperpage;
+
+	ecc_cfg = kzalloc(sizeof(*ecc_cfg), GFP_KERNEL);
+	if (!ecc_cfg)
+		return -ENOMEM;
+
+	nand->ecc.ctx.priv = ecc_cfg;
+
+	if (user->step_size && user->strength) {
+		step_size = user->step_size;
+		strength = user->strength;
+	} else if (reqs->step_size && reqs->strength) {
+		step_size = reqs->step_size;
+		strength = reqs->strength;
+	}
+
+	if (step_size && strength)
+		steps = mtd->writesize / step_size;
+
+	ecc_cfg->ecc_bytes_hw = 7;
+	ecc_cfg->spare_bytes = 4;
+	ecc_cfg->bbm_size = 1;
+	ecc_cfg->bch_enabled = true;
+	ecc_cfg->bytes = ecc_cfg->ecc_bytes_hw + ecc_cfg->spare_bytes + ecc_cfg->bbm_size;
+
+	ecc_cfg->steps = 4;
+	ecc_cfg->strength = 4;
+	ecc_cfg->step_size = 512;
+
+	mtd_set_ooblayout(mtd, &qcom_snand_ooblayout);
+
+	ecc_cfg->cw_data = 516;
+	ecc_cfg->cw_size = ecc_cfg->cw_data + ecc_cfg->bytes;
+	bad_block_byte = mtd->writesize - ecc_cfg->cw_size * (cwperpage - 1) + 1;
+
+	ecc_cfg->cfg0 = (cwperpage - 1) << CW_PER_PAGE
+				| ecc_cfg->cw_data << UD_SIZE_BYTES
+				| 1 << DISABLE_STATUS_AFTER_WRITE
+				| 3 << NUM_ADDR_CYCLES
+				| ecc_cfg->ecc_bytes_hw << ECC_PARITY_SIZE_BYTES_RS
+				| 0 << STATUS_BFR_READ
+				| 1 << SET_RD_MODE_AFTER_STATUS
+				| ecc_cfg->spare_bytes << SPARE_SIZE_BYTES;
+
+	ecc_cfg->cfg1 = 0 << NAND_RECOVERY_CYCLES
+				| 0 <<  CS_ACTIVE_BSY
+				| bad_block_byte << BAD_BLOCK_BYTE_NUM
+				| 0 << BAD_BLOCK_IN_SPARE_AREA
+				| 20 << WR_RD_BSY_GAP
+				| 0 << WIDE_FLASH
+				| ecc_cfg->bch_enabled << ENABLE_BCH_ECC;
+
+	ecc_cfg->cfg0_raw = (cwperpage - 1) << CW_PER_PAGE
+				| ecc_cfg->cw_size << UD_SIZE_BYTES
+				| 3 << NUM_ADDR_CYCLES
+				| 0 << SPARE_SIZE_BYTES;
+
+	ecc_cfg->cfg1_raw = 0 << NAND_RECOVERY_CYCLES
+				| 0 << CS_ACTIVE_BSY
+				| 17 << BAD_BLOCK_BYTE_NUM
+				| 1 << BAD_BLOCK_IN_SPARE_AREA
+				| 20 << WR_RD_BSY_GAP
+				| 0 << WIDE_FLASH
+				| 1 << DEV0_CFG1_ECC_DISABLE;
+
+	ecc_cfg->ecc_bch_cfg = !ecc_cfg->bch_enabled << ECC_CFG_ECC_DISABLE
+				| 0 << ECC_SW_RESET
+				| ecc_cfg->cw_data << ECC_NUM_DATA_BYTES
+				| 1 << ECC_FORCE_CLK_OPEN
+				| 0 << ECC_MODE
+				| ecc_cfg->ecc_bytes_hw << ECC_PARITY_SIZE_BYTES_BCH;
+
+	ecc_cfg->ecc_buf_cfg = 0x203 << NUM_STEPS;
+	ecc_cfg->clrflashstatus = FS_READY_BSY_N;
+	ecc_cfg->clrreadstatus = 0xc0;
+
+	conf->step_size = ecc_cfg->step_size;
+	conf->strength = ecc_cfg->strength;
+
+	if (ecc_cfg->strength < strength)
+		dev_warn(snandc->dev, "Unable to fulfill ECC requirements of %u bits.\n", strength);
+
+	dev_info(snandc->dev, "ECC strength: %u bits per %u bytes\n",
+		 ecc_cfg->strength, ecc_cfg->step_size);
+
+	return 0;
+}
+
+static void qpic_snand_ecc_cleanup_ctx_pipelined(struct nand_device *nand)
+{
+	struct qpic_ecc *ecc_cfg = nand_to_ecc_ctx(nand);
+
+	kfree(ecc_cfg);
+}
+
+static int qpic_snand_ecc_prepare_io_req_pipelined(struct nand_device *nand,
+						   struct nand_page_io_req *req)
+{
+	struct qcom_nand_controller *snandc = nand_to_qcom_snand(nand);
+	struct qpic_ecc *ecc_cfg = nand_to_ecc_ctx(nand);
+
+	snandc->ecc = ecc_cfg;
+	snandc->raw = false;
+	snandc->oob_read = false;
+
+	if (req->mode == MTD_OPS_RAW) {
+		if (req->ooblen)
+			snandc->oob_read = true;
+		snandc->raw = true;
+	}
+
+	return 0;
+}
+
+static int qpic_snand_ecc_finish_io_req_pipelined(struct nand_device *nand,
+						  struct nand_page_io_req *req)
+{
+	struct qcom_nand_controller *snandc = nand_to_qcom_snand(nand);
+	struct mtd_info *mtd = nanddev_to_mtd(nand);
+
+	if (req->mode == MTD_OPS_RAW || req->type != NAND_PAGE_READ)
+		return 0;
+
+	if (snandc->ecc_stats.failed)
+		mtd->ecc_stats.failed += snandc->ecc_stats.failed;
+	mtd->ecc_stats.corrected += snandc->ecc_stats.corrected;
+
+	if (snandc->ecc_stats.failed)
+		return -EBADMSG;
+	else
+		return snandc->ecc_stats.bitflips;
+}
+
+static struct nand_ecc_engine_ops qcom_snand_ecc_engine_ops_pipelined = {
+	.init_ctx = qpic_snand_ecc_init_ctx_pipelined,
+	.cleanup_ctx = qpic_snand_ecc_cleanup_ctx_pipelined,
+	.prepare_io_req = qpic_snand_ecc_prepare_io_req_pipelined,
+	.finish_io_req = qpic_snand_ecc_finish_io_req_pipelined,
+};
+
+/* helper to configure location register values */
+static void snandc_set_read_loc(struct qcom_nand_controller *snandc, int cw, int reg,
+				int cw_offset, int read_size, int is_last_read_loc)
+{
+	int reg_base = NAND_READ_LOCATION_0;
+
+	if (cw == 3)
+		reg_base = NAND_READ_LOCATION_LAST_CW_0;
+
+	reg_base += reg * 4;
+
+	if (cw == 3)
+		return snandc_set_read_loc_last(snandc, reg_base, cw_offset,
+				read_size, is_last_read_loc);
+	else
+		return snandc_set_read_loc_first(snandc, reg_base, cw_offset,
+				read_size, is_last_read_loc);
+}
+
+static void
+snandc_config_cw_read(struct qcom_nand_controller *snandc, bool use_ecc, int cw)
+{
+	int reg = NAND_READ_LOCATION_0;
+
+	if (cw == 3)
+		reg = NAND_READ_LOCATION_LAST_CW_0;
+
+	if (snandc->props->is_bam)
+		qcom_write_reg_dma(snandc, reg, 4, NAND_BAM_NEXT_SGL);
+
+	qcom_write_reg_dma(snandc, NAND_FLASH_CMD, 1, NAND_BAM_NEXT_SGL);
+	qcom_write_reg_dma(snandc, NAND_EXEC_CMD, 1, NAND_BAM_NEXT_SGL);
+
+	qcom_read_reg_dma(snandc, NAND_FLASH_STATUS, 2, 0);
+	qcom_read_reg_dma(snandc, NAND_ERASED_CW_DETECT_STATUS, 1,
+			  NAND_BAM_NEXT_SGL);
+}
+
+static int qpic_snand_block_erase(struct qcom_nand_controller *snandc)
+{
+	struct qpic_ecc *ecc_cfg = snandc->ecc;
+	int ret;
+
+	snandc->buf_count = 0;
+	snandc->buf_start = 0;
+	qcom_clear_read_regs(snandc);
+	qcom_clear_bam_transaction(snandc);
+
+	snandc_set_reg(snandc, NAND_FLASH_CMD, snandc->cmd);
+	snandc_set_reg(snandc, NAND_ADDR0, snandc->addr1);
+	snandc_set_reg(snandc, NAND_ADDR1, snandc->addr2);
+	snandc_set_reg(snandc, NAND_DEV0_CFG0, ecc_cfg->cfg0_raw & ~(7 << CW_PER_PAGE));
+	snandc_set_reg(snandc, NAND_DEV0_CFG1, ecc_cfg->cfg1_raw);
+	snandc_set_reg(snandc, NAND_EXEC_CMD, 1);
+
+	qcom_write_reg_dma(snandc, NAND_FLASH_CMD, 3, NAND_BAM_NEXT_SGL);
+	qcom_write_reg_dma(snandc, NAND_DEV0_CFG0, 2, NAND_BAM_NEXT_SGL);
+	qcom_write_reg_dma(snandc, NAND_EXEC_CMD, 1, NAND_BAM_NEXT_SGL);
+
+	ret = qcom_submit_descs(snandc);
+	if (ret) {
+		dev_err(snandc->dev, "failure to erase block\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static void config_snand_single_cw_page_read(struct qcom_nand_controller *snandc,
+					     bool use_ecc, int cw)
+{
+	int reg;
+
+	qcom_write_reg_dma(snandc, NAND_ADDR0, 2, 0);
+	qcom_write_reg_dma(snandc, NAND_DEV0_CFG0, 3, 0);
+	qcom_write_reg_dma(snandc, NAND_ERASED_CW_DETECT_CFG, 1, 0);
+	qcom_write_reg_dma(snandc, NAND_ERASED_CW_DETECT_CFG, 1,
+			   NAND_ERASED_CW_SET | NAND_BAM_NEXT_SGL);
+
+	reg = NAND_READ_LOCATION_0;
+	if (cw == 3)
+		reg = NAND_READ_LOCATION_LAST_CW_0;
+	qcom_write_reg_dma(snandc, reg, 4, NAND_BAM_NEXT_SGL);
+	qcom_write_reg_dma(snandc, NAND_FLASH_CMD, 1, NAND_BAM_NEXT_SGL);
+	qcom_write_reg_dma(snandc, NAND_EXEC_CMD, 1, NAND_BAM_NEXT_SGL);
+
+	qcom_read_reg_dma(snandc, NAND_FLASH_STATUS, 2, 0);
+	qcom_read_reg_dma(snandc, NAND_ERASED_CW_DETECT_STATUS, 1, NAND_BAM_NEXT_SGL);
+}
+
+static int qpic_snand_read_oob(struct qcom_nand_controller *snandc,
+			       const struct spi_mem_op *op)
+{
+	struct qpic_ecc *ecc_cfg = snandc->ecc;
+	int size, ret;
+	int col,  bbpos;
+	u32 cfg0, cfg1, ecc_bch_cfg;
+	u32 num_cw = snandc->num_cw;
+
+	qcom_clear_bam_transaction(snandc);
+	qcom_clear_read_regs(snandc);
+
+	size = ecc_cfg->cw_size;
+	col = ecc_cfg->cw_size * (num_cw - 1);
+
+	/* prepare a clean read buffer */
+	memset(snandc->data_buffer, 0xff, size);
+	snandc_set_reg(snandc, NAND_ADDR0, (snandc->addr1 | col));
+	snandc_set_reg(snandc, NAND_ADDR1, snandc->addr2);
+
+	cfg0 = (ecc_cfg->cfg0_raw & ~(7U << CW_PER_PAGE)) |
+		0 << CW_PER_PAGE;
+	cfg1 = ecc_cfg->cfg1_raw;
+	ecc_bch_cfg = 1 << ECC_CFG_ECC_DISABLE;
+
+	snandc_set_reg(snandc, NAND_FLASH_CMD, snandc->cmd);
+	snandc_set_reg(snandc, NAND_DEV0_CFG0, cfg0);
+	snandc_set_reg(snandc, NAND_DEV0_CFG1, cfg1);
+	snandc_set_reg(snandc, NAND_DEV0_ECC_CFG, ecc_bch_cfg);
+	snandc_set_reg(snandc, NAND_EXEC_CMD, 1);
+
+	config_snand_single_cw_page_read(snandc, false, num_cw - 1);
+
+	qcom_read_data_dma(snandc, FLASH_BUF_ACC, snandc->data_buffer, size, 0);
+
+	ret = qcom_submit_descs(snandc);
+	if (ret)
+		dev_err(snandc->dev, "failed to read oob\n");
+
+	qcom_nandc_read_buffer_sync(snandc, true);
+	u32 flash = le32_to_cpu(snandc->reg_read_buf[0]);
+
+	if (flash & (FS_OP_ERR | FS_MPU_ERR))
+		return -EIO;
+
+	bbpos = 2048 - ecc_cfg->cw_size * (num_cw - 1);
+	memcpy(op->data.buf.in, snandc->data_buffer + bbpos, op->data.nbytes);
+
+	return ret;
+}
+
+static int snandc_check_error(struct qcom_nand_controller *snandc)
+{
+	struct snandc_read_status *buf;
+	int i, num_cw = snandc->num_cw;
+	bool serial_op_err = false, erased;
+
+	qcom_nandc_read_buffer_sync(snandc, true);
+	buf = (struct snandc_read_status *)snandc->reg_read_buf;
+
+	for (i = 0; i < num_cw; i++, buf++) {
+		u32 flash, buffer, erased_cw;
+
+		flash = le32_to_cpu(buf->snandc_flash);
+		buffer = le32_to_cpu(buf->snandc_buffer);
+		erased_cw = le32_to_cpu(buf->snandc_erased_cw);
+
+		if ((flash & FS_OP_ERR) && (buffer & BS_UNCORRECTABLE_BIT)) {
+			erased = (erased_cw & ERASED_CW) == ERASED_CW ?
+				true : false;
+		} else if (flash & (FS_OP_ERR | FS_MPU_ERR)) {
+			serial_op_err = true;
+		}
+	}
+
+	if (serial_op_err)
+		return -EIO;
+
+	return 0;
+}
+
+static int qpic_snand_read_page_cache(struct qcom_nand_controller *snandc,
+				      const struct spi_mem_op *op)
+{
+	struct qpic_ecc *ecc_cfg = snandc->ecc;
+	u8 *data_buf;
+	int ret, i;
+	u32 cfg0, cfg1, ecc_bch_cfg, num_cw = snandc->num_cw;
+
+	data_buf = op->data.buf.in;
+
+	if (snandc->oob_read) {
+		return qpic_snand_read_oob(snandc, op);
+		snandc->oob_read = false;
+	}
+
+	snandc->buf_count = 0;
+	snandc->buf_start = 0;
+	qcom_clear_read_regs(snandc);
+
+	cfg0 = (ecc_cfg->cfg0 & ~(7U << CW_PER_PAGE)) |
+				(num_cw - 1) << CW_PER_PAGE;
+	cfg1 = ecc_cfg->cfg1;
+	ecc_bch_cfg = ecc_cfg->ecc_bch_cfg;
+
+	snandc_set_reg(snandc, NAND_ADDR0, snandc->addr1);
+	snandc_set_reg(snandc, NAND_ADDR1, snandc->addr2);
+	snandc_set_reg(snandc, NAND_FLASH_CMD, snandc->cmd);
+	snandc_set_reg(snandc, NAND_DEV0_CFG0, cfg0);
+	snandc_set_reg(snandc, NAND_DEV0_CFG1, cfg1);
+	snandc_set_reg(snandc, NAND_DEV0_ECC_CFG, ecc_bch_cfg);
+	snandc_set_reg(snandc, NAND_FLASH_STATUS, ecc_cfg->clrflashstatus);
+	snandc_set_reg(snandc, NAND_READ_STATUS, ecc_cfg->clrreadstatus);
+	snandc_set_reg(snandc, NAND_EXEC_CMD, 1);
+	snandc_set_read_loc(snandc, 0, 0, 0, ecc_cfg->cw_data, 1);
+
+	qcom_clear_bam_transaction(snandc);
+
+	qcom_write_reg_dma(snandc, NAND_ADDR0, 2, 0);
+	qcom_write_reg_dma(snandc, NAND_DEV0_CFG0, 3, 0);
+	qcom_write_reg_dma(snandc, NAND_ERASED_CW_DETECT_CFG, 1, 0);
+	qcom_write_reg_dma(snandc, NAND_ERASED_CW_DETECT_CFG, 1,
+			   NAND_ERASED_CW_SET | NAND_BAM_NEXT_SGL);
+
+	for (i = 0; i < num_cw; i++) {
+		int data_size;
+
+		if (i == (num_cw - 1))
+			data_size = 512 - ((num_cw - 1) << 2);
+		else
+			data_size = ecc_cfg->cw_data;
+
+		if (data_buf)
+			snandc_set_read_loc(snandc, i, 0, 0, data_size, 1);
+
+		snandc_config_cw_read(snandc, true, i);
+
+		if (data_buf)
+			qcom_read_data_dma(snandc, FLASH_BUF_ACC, data_buf,
+					   data_size, 0);
+
+		if (data_buf)
+			data_buf += data_size;
+	}
+
+	ret = qcom_submit_descs(snandc);
+	if (ret) {
+		dev_err(snandc->dev, "failure to read page/oob\n");
+		return ret;
+	}
+
+	return snandc_check_error(snandc);
+}
+
+static void config_snand_page_write(struct qcom_nand_controller *snandc)
+{
+	qcom_write_reg_dma(snandc, NAND_ADDR0, 2, 0);
+	qcom_write_reg_dma(snandc, NAND_DEV0_CFG0, 3, 0);
+	qcom_write_reg_dma(snandc, NAND_EBI2_ECC_BUF_CFG, 1, NAND_BAM_NEXT_SGL);
+}
+
+static void config_snand_cw_write(struct qcom_nand_controller *snandc)
+{
+	qcom_write_reg_dma(snandc, NAND_FLASH_CMD, 1, NAND_BAM_NEXT_SGL);
+	qcom_write_reg_dma(snandc, NAND_EXEC_CMD, 1, NAND_BAM_NEXT_SGL);
+}
+
+static int qpic_snand_program_execute(struct qcom_nand_controller *snandc,
+				      const struct spi_mem_op *op)
+{
+	struct qpic_ecc *ecc_cfg = snandc->ecc;
+	u8 *data_buf;
+	int i, ret;
+	int num_cw = snandc->num_cw;
+	u32 cfg0, cfg1, ecc_bch_cfg, ecc_buf_cfg;
+
+	cfg0 = (ecc_cfg->cfg0 & ~(7U << CW_PER_PAGE)) |
+				(num_cw - 1) << CW_PER_PAGE;
+	cfg1 = ecc_cfg->cfg1;
+	ecc_bch_cfg = ecc_cfg->ecc_bch_cfg;
+	ecc_buf_cfg = ecc_cfg->ecc_buf_cfg;
+
+	data_buf = snandc->wbuf;
+
+	snandc->buf_count = 0;
+	snandc->buf_start = 0;
+	qcom_clear_read_regs(snandc);
+	qcom_clear_bam_transaction(snandc);
+
+	snandc_set_reg(snandc, NAND_ADDR0, snandc->addr1);
+	snandc_set_reg(snandc, NAND_ADDR1, snandc->addr2);
+	snandc_set_reg(snandc, NAND_FLASH_CMD, snandc->cmd);
+
+	snandc_set_reg(snandc, NAND_DEV0_CFG0, cfg0);
+	snandc_set_reg(snandc, NAND_DEV0_CFG1, cfg1);
+	snandc_set_reg(snandc, NAND_DEV0_ECC_CFG, ecc_bch_cfg);
+
+	snandc_set_reg(snandc, NAND_EBI2_ECC_BUF_CFG, ecc_buf_cfg);
+
+	snandc_set_reg(snandc, NAND_EXEC_CMD, 1);
+
+	config_snand_page_write(snandc);
+
+	for (i = 0; i < num_cw; i++) {
+		int data_size;
+
+		if (i == (num_cw - 1))
+			data_size = NANDC_STEP_SIZE - ((num_cw - 1) << 2);
+		else
+			data_size = ecc_cfg->cw_data;
+
+		qcom_write_data_dma(snandc, FLASH_BUF_ACC, data_buf, data_size,
+				    i == (num_cw - 1) ? NAND_BAM_NO_EOT : 0);
+
+		config_snand_cw_write(snandc);
+		if (data_buf)
+			data_buf += data_size;
+	}
+
+	ret = qcom_submit_descs(snandc);
+	if (ret) {
+		dev_err(snandc->dev, "failure to write page\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static u32 qpic_snand_cmd_mapping(struct qcom_nand_controller *snandc, u32 opcode)
+{
+	u32 cmd = 0x0;
+
+	switch (opcode) {
+	case SPINAND_RESET:
+		cmd = (SPI_WP | SPI_HOLD | SPI_TRANSFER_MODE_x1 | OP_RESET_DEVICE);
+		break;
+	case SPINAND_READID:
+		cmd = (SPI_WP | SPI_HOLD | SPI_TRANSFER_MODE_x1 | OP_FETCH_ID);
+		break;
+	case SPINAND_GET_FEATURE:
+		cmd = (SPI_TRANSFER_MODE_x1 | SPI_WP | SPI_HOLD | ACC_FEATURE);
+		break;
+	case SPINAND_SET_FEATURE:
+		cmd = (SPI_TRANSFER_MODE_x1 | SPI_WP | SPI_HOLD | ACC_FEATURE |
+			QPIC_SET_FEATURE);
+		break;
+	case SPINAND_READ:
+		if (snandc->raw)
+			cmd = (PAGE_ACC | LAST_PAGE | SPI_TRANSFER_MODE_x1 |
+					SPI_WP | SPI_HOLD | OP_PAGE_READ);
+		else
+			cmd = (PAGE_ACC | LAST_PAGE | SPI_TRANSFER_MODE_x1 |
+					SPI_WP | SPI_HOLD | OP_PAGE_READ_WITH_ECC);
+		break;
+	case SPINAND_ERASE:
+		cmd = OP_BLOCK_ERASE | PAGE_ACC | LAST_PAGE | SPI_WP |
+			SPI_HOLD | SPI_TRANSFER_MODE_x1;
+		break;
+	case SPINAND_WRITE_EN:
+		cmd = SPINAND_WRITE_EN;
+		break;
+	case SPINAND_PROGRAM_EXECUTE:
+		cmd = (PAGE_ACC | LAST_PAGE | SPI_TRANSFER_MODE_x1 |
+				SPI_WP | SPI_HOLD | OP_PROGRAM_PAGE);
+		break;
+	case SPINAND_PROGRAM_LOAD:
+		cmd = SPINAND_PROGRAM_LOAD;
+		break;
+	default:
+		break;
+	}
+
+	return cmd;
+}
+
+static int qpic_snand_write_page_cache(struct qcom_nand_controller *snandc,
+				       const struct spi_mem_op *op)
+{
+	struct qpic_snand_op s_op = {};
+	u32 cmd;
+
+	cmd = qpic_snand_cmd_mapping(snandc, op->cmd.opcode);
+	s_op.cmd_reg = cmd;
+
+	if (op->cmd.opcode == SPINAND_PROGRAM_LOAD) {
+		snandc->wbuf = (u8 *)op->data.buf.out;
+		snandc->wlen = op->data.nbytes;
+	}
+
+	return 0;
+}
+
+static int qpic_snand_send_cmdaddr(struct qcom_nand_controller *snandc,
+				   const struct spi_mem_op *op)
+{
+	struct qpic_snand_op s_op = {};
+	u32 cmd;
+	int ret;
+
+	cmd = qpic_snand_cmd_mapping(snandc, op->cmd.opcode);
+
+	s_op.cmd_reg = cmd;
+	s_op.addr1_reg = op->addr.val;
+	s_op.addr2_reg = 0;
+
+	if (op->cmd.opcode == SPINAND_WRITE_EN)
+		return 0;
+
+	if (op->cmd.opcode == SPINAND_PROGRAM_EXECUTE) {
+		s_op.addr1_reg = op->addr.val << 16;
+		s_op.addr2_reg = op->addr.val >> 16 & 0xff;
+		snandc->addr1 = s_op.addr1_reg;
+		snandc->addr2 = s_op.addr2_reg;
+		snandc->cmd = cmd;
+		return qpic_snand_program_execute(snandc, op);
+	}
+
+	if (op->cmd.opcode == SPINAND_READ) {
+		s_op.addr1_reg = (op->addr.val << 16);
+		s_op.addr2_reg = op->addr.val >> 16 & 0xff;
+		snandc->addr1 = s_op.addr1_reg;
+		snandc->addr2 = s_op.addr2_reg;
+		snandc->cmd = cmd;
+		return 0;
+	}
+
+	if (op->cmd.opcode == SPINAND_ERASE) {
+		s_op.addr2_reg = (op->addr.val >> 16) & 0xffff;
+		s_op.addr1_reg = op->addr.val;
+		snandc->addr1 = s_op.addr1_reg;
+		snandc->addr1 <<= 16;
+		snandc->addr2 = s_op.addr2_reg;
+		snandc->cmd = cmd;
+		qpic_snand_block_erase(snandc);
+		return 0;
+	}
+
+	snandc->buf_count = 0;
+	snandc->buf_start = 0;
+	qcom_clear_read_regs(snandc);
+	qcom_clear_bam_transaction(snandc);
+
+	snandc_set_reg(snandc, NAND_FLASH_CMD, s_op.cmd_reg);
+	snandc_set_reg(snandc, NAND_EXEC_CMD, 0x1);
+	snandc_set_reg(snandc, NAND_ADDR0, s_op.addr1_reg);
+	snandc_set_reg(snandc, NAND_ADDR1, s_op.addr2_reg);
+
+	qcom_write_reg_dma(snandc, NAND_FLASH_CMD, 3, NAND_BAM_NEXT_SGL);
+	qcom_write_reg_dma(snandc, NAND_EXEC_CMD, 1, NAND_BAM_NEXT_SGL);
+
+	ret = qcom_submit_descs(snandc);
+	if (ret)
+		dev_err(snandc->dev, "failure in sbumitting cmd descriptor\n");
+
+	return ret;
+}
+
+static int qpic_snand_io_op(struct qcom_nand_controller *snandc, const struct spi_mem_op *op)
+{
+	int ret, val, opcode;
+	bool copy = false, copy_ftr = false;
+
+	ret = qpic_snand_send_cmdaddr(snandc, op);
+	if (ret)
+		return ret;
+
+	snandc->buf_count = 0;
+	snandc->buf_start = 0;
+	qcom_clear_read_regs(snandc);
+	qcom_clear_bam_transaction(snandc);
+	opcode = op->cmd.opcode;
+
+	switch (opcode) {
+	case SPINAND_READID:
+		snandc->buf_count = 4;
+		qcom_read_reg_dma(snandc, NAND_READ_ID, 1, NAND_BAM_NEXT_SGL);
+		copy = true;
+		break;
+	case SPINAND_GET_FEATURE:
+		snandc->buf_count = 4;
+		qcom_read_reg_dma(snandc, NAND_FLASH_FEATURES, 1, NAND_BAM_NEXT_SGL);
+		copy_ftr = true;
+		break;
+	case SPINAND_SET_FEATURE:
+		snandc_set_reg(snandc, NAND_FLASH_FEATURES, *(u32 *)op->data.buf.out);
+		qcom_write_reg_dma(snandc, NAND_FLASH_FEATURES, 1, NAND_BAM_NEXT_SGL);
+		break;
+	default:
+		return 0;
+	}
+
+	ret = qcom_submit_descs(snandc);
+	if (ret)
+		dev_err(snandc->dev, "failure in submitting descriptor for:%d\n", opcode);
+
+	if (copy) {
+		qcom_nandc_read_buffer_sync(snandc, true);
+		memcpy(op->data.buf.in, snandc->reg_read_buf, snandc->buf_count);
+	}
+
+	if (copy_ftr) {
+		qcom_nandc_read_buffer_sync(snandc, true);
+		val = le32_to_cpu(*(__le32 *)snandc->reg_read_buf);
+		val >>= 8;
+		memcpy(op->data.buf.in, &val, snandc->buf_count);
+	}
+
+	return ret;
+}
+
+static bool qpic_snand_is_page_op(const struct spi_mem_op *op)
+{
+	if (op->addr.buswidth != 1 && op->addr.buswidth != 2 && op->addr.buswidth != 4)
+		return false;
+
+	if (op->data.dir == SPI_MEM_DATA_IN) {
+		if (op->addr.buswidth == 4 && op->data.buswidth == 4)
+			return true;
+
+		if (op->addr.nbytes == 2 && op->addr.buswidth == 1)
+			return true;
+
+	} else if (op->data.dir == SPI_MEM_DATA_OUT) {
+		if (op->data.buswidth == 4)
+			return true;
+		if (op->addr.nbytes == 2 && op->addr.buswidth == 1)
+			return true;
+	}
+
+	return false;
+}
+
+static bool qpic_snand_supports_op(struct spi_mem *mem, const struct spi_mem_op *op)
+{
+	if (!spi_mem_default_supports_op(mem, op))
+		return false;
+
+	if (op->cmd.nbytes != 1 || op->cmd.buswidth != 1)
+		return false;
+
+	if (qpic_snand_is_page_op(op))
+		return true;
+
+	return ((op->addr.nbytes == 0 || op->addr.buswidth == 1) &&
+		(op->dummy.nbytes == 0 || op->dummy.buswidth == 1) &&
+		(op->data.nbytes == 0 || op->data.buswidth == 1));
+}
+
+static int qpic_snand_exec_op(struct spi_mem *mem, const struct spi_mem_op *op)
+{
+	struct qcom_nand_controller *snandc = spi_controller_get_devdata(mem->spi->controller);
+
+	dev_dbg(snandc->dev, "OP %02x ADDR %08llX@%d:%u DATA %d:%u", op->cmd.opcode,
+		op->addr.val, op->addr.buswidth, op->addr.nbytes,
+		op->data.buswidth, op->data.nbytes);
+
+	if (qpic_snand_is_page_op(op)) {
+		if (op->data.dir == SPI_MEM_DATA_IN)
+			return qpic_snand_read_page_cache(snandc, op);
+		if (op->data.dir == SPI_MEM_DATA_OUT)
+			return qpic_snand_write_page_cache(snandc, op);
+	} else {
+		return qpic_snand_io_op(snandc, op);
+	}
+
+	return 0;
+}
+
+static const struct spi_controller_mem_ops qcom_spi_mem_ops = {
+	.supports_op = qpic_snand_supports_op,
+	.exec_op = qpic_snand_exec_op,
+};
+
+static const struct spi_controller_mem_caps qcom_snand_mem_caps = {
+	.ecc = true,
+};
+
+static int qcom_snand_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct spi_controller *ctlr;
+	struct qcom_nand_controller *snandc;
+	struct resource *res;
+	const void *dev_data;
+	struct qpic_ecc *ecc;
+	int ret;
+
+	ecc = devm_kzalloc(dev, sizeof(*ecc), GFP_KERNEL);
+	if (!ecc)
+		return -ENOMEM;
+
+	ctlr = __devm_spi_alloc_controller(dev, sizeof(*snandc), false);
+	if (!ctlr)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, ctlr);
+
+	snandc = spi_controller_get_devdata(ctlr);
+
+	snandc->ctlr = ctlr;
+	snandc->dev = dev;
+	snandc->ecc = ecc;
+
+	dev_data = of_device_get_match_data(dev);
+	if (!dev_data) {
+		dev_err(&pdev->dev, "failed to get device data\n");
+		return -ENODEV;
+	}
+
+	snandc->props = dev_data;
+	snandc->dev = &pdev->dev;
+
+	snandc->core_clk = devm_clk_get(dev, "core");
+	if (IS_ERR(snandc->core_clk))
+		return PTR_ERR(snandc->core_clk);
+
+	snandc->aon_clk = devm_clk_get(dev, "aon");
+	if (IS_ERR(snandc->aon_clk))
+		return PTR_ERR(snandc->aon_clk);
+
+	snandc->iomacro_clk = devm_clk_get(dev, "iom");
+	if (IS_ERR(snandc->iomacro_clk))
+		return PTR_ERR(snandc->iomacro_clk);
+
+	snandc->base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
+	if (IS_ERR(snandc->base))
+		return PTR_ERR(snandc->base);
+
+	snandc->base_phys = res->start;
+	snandc->base_dma = dma_map_resource(dev, res->start, resource_size(res),
+					    DMA_BIDIRECTIONAL, 0);
+	if (dma_mapping_error(dev, snandc->base_dma))
+		return -ENXIO;
+
+	ret = clk_prepare_enable(snandc->core_clk);
+	if (ret)
+		goto err_core_clk;
+
+	ret = clk_prepare_enable(snandc->aon_clk);
+	if (ret)
+		goto err_aon_clk;
+
+	ret = clk_prepare_enable(snandc->iomacro_clk);
+	if (ret)
+		goto err_snandc_alloc;
+
+	ret = qcom_nandc_alloc(snandc);
+	if (ret)
+		goto err_snandc_alloc;
+
+	ret = qcom_snand_init(snandc);
+	if (ret)
+		goto err_init;
+
+	/* setup ECC engine */
+	snandc->ecc_eng.dev = &pdev->dev;
+	snandc->ecc_eng.integration = NAND_ECC_ENGINE_INTEGRATION_PIPELINED;
+	snandc->ecc_eng.ops = &qcom_snand_ecc_engine_ops_pipelined;
+	snandc->ecc_eng.priv = snandc;
+
+	ret = nand_ecc_register_on_host_hw_engine(&snandc->ecc_eng);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to register ecc engine.\n");
+		goto err_init;
+	}
+
+	ctlr->num_chipselect = QPIC_QSPI_NUM_CS;
+	ctlr->mem_ops = &qcom_spi_mem_ops;
+	ctlr->mem_caps = &qcom_snand_mem_caps;
+	ctlr->dev.of_node = pdev->dev.of_node;
+	ctlr->mode_bits = SPI_TX_DUAL | SPI_RX_DUAL |
+			    SPI_TX_QUAD | SPI_RX_QUAD;
+
+	ret = spi_register_controller(ctlr);
+	if (ret) {
+		dev_err(&pdev->dev, "spi_register_controller failed.\n");
+		goto err_init;
+	}
+
+	return 0;
+
+err_init:
+	qcom_nandc_unalloc(snandc);
+err_snandc_alloc:
+	clk_disable_unprepare(snandc->aon_clk);
+err_aon_clk:
+	clk_disable_unprepare(snandc->core_clk);
+err_core_clk:
+	dma_unmap_resource(dev, res->start, resource_size(res),
+			   DMA_BIDIRECTIONAL, 0);
+	return ret;
+}
+
+static int qcom_snand_remove(struct platform_device *pdev)
+{
+	struct spi_controller *ctlr = platform_get_drvdata(pdev);
+	struct qcom_nand_controller *snandc = spi_controller_get_devdata(ctlr);
+	struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+
+	spi_unregister_controller(ctlr);
+
+	clk_disable_unprepare(snandc->aon_clk);
+	clk_disable_unprepare(snandc->core_clk);
+	clk_disable_unprepare(snandc->iomacro_clk);
+
+	dma_unmap_resource(&pdev->dev, snandc->base_dma, resource_size(res),
+			   DMA_BIDIRECTIONAL, 0);
+	return 0;
+}
+
+static const struct qcom_nandc_props ipq9574_snandc_props = {
+	.dev_cmd_reg_start = 0x7000,
+	.is_bam = true,
+};
+
+static const struct of_device_id qcom_snandc_of_match[] = {
+	{
+		.compatible = "qcom,spi-qpic-snand",
+		.data = &ipq9574_snandc_props,
+	},
+	{}
+}
+MODULE_DEVICE_TABLE(of, qcom_snandc_of_match);
+
+static struct platform_driver qcom_snand_driver = {
+	.driver = {
+		.name		= "qcom_snand",
+		.of_match_table = qcom_snandc_of_match,
+	},
+	.probe = qcom_snand_probe,
+	.remove = qcom_snand_remove,
+};
+module_platform_driver(qcom_snand_driver);
+
+MODULE_DESCRIPTION("SPI driver for QPIC QSPI cores");
+MODULE_AUTHOR("Md Sadre Alam <quic_mdalam@quicinc.com>");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/mtd/nand-qpic-common.h b/include/linux/mtd/nand-qpic-common.h
index aced15866627..4673cd36ff0a 100644
--- a/include/linux/mtd/nand-qpic-common.h
+++ b/include/linux/mtd/nand-qpic-common.h
@@ -45,6 +45,9 @@
 #define	NAND_DEV_CMD1			0xa4
 #define	NAND_DEV_CMD2			0xa8
 #define	NAND_DEV_CMD_VLD		0xac
+#define NAND_FLASH_SPI_CFG              0xc0
+#define NAND_NUM_ADDR_CYCLES            0xc4
+#define NAND_BUSY_CHECK_WAIT_CNT        0xc8
 #define	SFLASHC_BURST_CFG		0xe0
 #define	NAND_ERASED_CW_DETECT_CFG	0xe8
 #define	NAND_ERASED_CW_DETECT_STATUS	0xec
@@ -61,6 +64,7 @@
 #define	NAND_READ_LOCATION_LAST_CW_1	0xf44
 #define	NAND_READ_LOCATION_LAST_CW_2	0xf48
 #define	NAND_READ_LOCATION_LAST_CW_3	0xf4c
+#define NAND_FLASH_FEATURES             0xf64
 
 /* dummy register offsets, used by write_reg_dma */
 #define	NAND_DEV_CMD1_RESTORE		0xdead
@@ -169,6 +173,7 @@
 #define	OP_CHECK_STATUS			0xc
 #define	OP_FETCH_ID			0xb
 #define	OP_RESET_DEVICE			0xd
+#define ACC_FEATURE                     0xe
 
 /* Default Value for NAND_DEV_CMD_VLD */
 #define NAND_DEV_CMD_VLD_VAL		(READ_START_VLD | WRITE_START_VLD | \
@@ -329,11 +334,53 @@ struct nandc_regs {
 	__le32 read_location_last1;
 	__le32 read_location_last2;
 	__le32 read_location_last3;
+	__le32 spi_cfg;
+	__le32 num_addr_cycle;
+	__le32 busy_wait_cnt;
+	__le32 flash_feature;
 
 	__le32 erased_cw_detect_cfg_clr;
 	__le32 erased_cw_detect_cfg_set;
 };
 
+struct qcom_ecc_stats {
+	u32 corrected;
+	u32 bitflips;
+	u32 failed;
+};
+
+/*
+ * QPIC ECC data struct
+ *
+ */
+struct qpic_ecc {
+	struct device *dev;
+	const struct qpic_ecc_caps *caps;
+	struct completion done;
+	u32 sectors;
+	u8 *eccdata;
+	bool use_ecc;
+	u32 ecc_modes;
+	int ecc_bytes_hw;
+	int spare_bytes;
+	int bbm_size;
+	int ecc_mode;
+	int bytes;
+	int steps;
+	int step_size;
+	int strength;
+	int cw_size;
+	int cw_data;
+	u32 cfg0, cfg1;
+	u32 cfg0_raw, cfg1_raw;
+	u32 ecc_buf_cfg;
+	u32 ecc_bch_cfg;
+	u32 clrflashstatus;
+	u32 clrreadstatus;
+	bool bch_enabled;
+};
+
+struct qpic_ecc;
 /*
  * NAND controller data struct
  *
@@ -352,6 +399,7 @@ struct nandc_regs {
  *				initialized via DT match data
  *
  * @controller:			base controller structure
+ * @ctlr:			spi controller structure
  * @host_list:			list containing all the chips attached to the
  *				controller
  *
@@ -389,6 +437,7 @@ struct qcom_nand_controller {
 
 	struct clk *core_clk;
 	struct clk *aon_clk;
+	struct clk *iomacro_clk;
 
 	struct nandc_regs *regs;
 	struct bam_transaction *bam_txn;
@@ -396,6 +445,7 @@ struct qcom_nand_controller {
 	const struct qcom_nandc_props *props;
 
 	struct nand_controller controller;
+	struct spi_controller *ctlr;
 	struct list_head host_list;
 
 	union {
@@ -432,6 +482,17 @@ struct qcom_nand_controller {
 
 	u32 cmd1, vld;
 	bool exec_opwrite;
+	struct qpic_ecc *ecc;
+	struct qcom_ecc_stats ecc_stats;
+	struct nand_ecc_engine ecc_eng;
+	u8 *wbuf;
+	u32 wlen;
+	u32 addr1;
+	u32 addr2;
+	u32 cmd;
+	u32 num_cw;
+	bool oob_read;
+	bool raw;
 };
 
 /*
-- 
2.34.1