[PATCH v2 2/8] mtd: spi-nor: add cadence quadspi driver

[Steffen Trumtrar <s.trumtrar@pengutronix.de>]

Signed-off-by: Steffen Trumtrar <s.trumtrar@pengutronix.de>
---
 drivers/mtd/spi-nor/Kconfig           |    9 +
 drivers/mtd/spi-nor/Makefile          |    1 +
 drivers/mtd/spi-nor/cadence-quadspi.c | 1211 +++++++++++++++++++++++++++++++++
 include/platform_data/cadence_qspi.h  |    9 +
 4 files changed, 1230 insertions(+)
 create mode 100644 drivers/mtd/spi-nor/cadence-quadspi.c
 create mode 100644 include/platform_data/cadence_qspi.h

diff --git a/drivers/mtd/spi-nor/Kconfig b/drivers/mtd/spi-nor/Kconfig
index 1568b2fb6d69..a84591fdd139 100644
--- a/drivers/mtd/spi-nor/Kconfig
+++ b/drivers/mtd/spi-nor/Kconfig
@@ -4,3 +4,12 @@ menuconfig MTD_SPI_NOR
 	help
 	  This is the framework for the SPI NOR which can be used by the SPI
 	  device drivers and the SPI-NOR device driver.
+
+if MTD_SPI_NOR
+
+config SPI_CADENCE_QUADSPI
+	tristate "Cadence Quad SPI controller"
+	help
+	  This enables support for the Cadence Quad SPI controller and NOR flash.
+
+endif
diff --git a/drivers/mtd/spi-nor/Makefile b/drivers/mtd/spi-nor/Makefile
index fe88e3d86ee5..4e00f38a7d86 100644
--- a/drivers/mtd/spi-nor/Makefile
+++ b/drivers/mtd/spi-nor/Makefile
@@ -1 +1,2 @@
 obj-$(CONFIG_MTD_SPI_NOR)		+= spi-nor.o
+obj-$(CONFIG_SPI_CADENCE_QUADSPI)	+= cadence-quadspi.o
diff --git a/drivers/mtd/spi-nor/cadence-quadspi.c b/drivers/mtd/spi-nor/cadence-quadspi.c
new file mode 100644
index 000000000000..dce29ca0ea02
--- /dev/null
+++ b/drivers/mtd/spi-nor/cadence-quadspi.c
@@ -0,0 +1,1211 @@
+/*
+ * Copyright (C) 2015 Pengutronix, Steffen Trumtrar <s.trumtrar@pengutronix.de>
+ *
+ * derived from Linux kernel driver by
+ *
+ * Driver for Cadence QSPI Controller
+ *
+ * Copyright Altera Corporation (C) 2012-2014. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <clock.h>
+#include <common.h>
+#include <driver.h>
+#include <errno.h>
+#include <init.h>
+#include <io.h>
+#include <linux/clk.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/spi-nor.h>
+#include <of.h>
+#include <platform_data/cadence_qspi.h>
+#include <spi/spi.h>
+
+#define CQSPI_MAX_CHIPSELECT		16
+
+struct cqspi_flash_pdata {
+	struct mtd_info mtd;
+	struct spi_nor nor;
+	u32 clk_rate;
+	unsigned int block_size;
+	unsigned int read_delay;
+	unsigned int tshsl_ns;
+	unsigned int tsd2d_ns;
+	unsigned int tchsh_ns;
+	unsigned int tslch_ns;
+};
+
+struct cqspi_st {
+	struct device_d	*dev;
+	struct clk	*l4_mp_clk;
+	struct clk	*qspi_clk;
+	unsigned int	sclk;
+
+	void __iomem	*iobase;
+	void __iomem	*ahb_base;
+	unsigned int	irq_mask;
+	int		current_cs;
+	unsigned int	master_ref_clk_hz;
+	unsigned int	ext_decoder;
+	unsigned int	fifo_depth;
+	struct cqspi_flash_pdata f_pdata[CQSPI_MAX_CHIPSELECT];
+	bool no_reconfig;
+};
+
+/* Operation timeout value */
+#define CQSPI_TIMEOUT_MS			800 * MSECOND
+#define CQSPI_READ_TIMEOUT_MS			100 * MSECOND
+#define CQSPI_POLL_IDLE_RETRY			3
+
+#define CQSPI_FIFO_WIDTH			4
+
+#define CQSPI_REG_SRAM_THRESHOLD_BYTES		50
+
+/* Instruction type */
+#define CQSPI_INST_TYPE_SINGLE			0
+#define CQSPI_INST_TYPE_DUAL			1
+#define CQSPI_INST_TYPE_QUAD			2
+
+#define CQSPI_DUMMY_CLKS_PER_BYTE		8
+#define CQSPI_DUMMY_BYTES_MAX			4
+
+#define CQSPI_STIG_DATA_LEN_MAX			8
+
+#define CQSPI_INDIRECTTRIGGER_ADDR_MASK		0xFFFFF
+
+/* Register map */
+#define CQSPI_REG_CONFIG			0x00
+#define CQSPI_REG_CONFIG_ENABLE_MASK		BIT(0)
+#define CQSPI_REG_CONFIG_DECODE_MASK		BIT(9)
+#define CQSPI_REG_CONFIG_CHIPSELECT_LSB		10
+#define CQSPI_REG_CONFIG_DMA_MASK		BIT(15)
+#define CQSPI_REG_CONFIG_BAUD_LSB		19
+#define CQSPI_REG_CONFIG_IDLE_LSB		31
+#define CQSPI_REG_CONFIG_CHIPSELECT_MASK	0xF
+#define CQSPI_REG_CONFIG_BAUD_MASK		0xF
+
+#define CQSPI_REG_RD_INSTR			0x04
+#define CQSPI_REG_RD_INSTR_OPCODE_LSB		0
+#define CQSPI_REG_RD_INSTR_TYPE_INSTR_LSB	8
+#define CQSPI_REG_RD_INSTR_TYPE_ADDR_LSB	12
+#define CQSPI_REG_RD_INSTR_TYPE_DATA_LSB	16
+#define CQSPI_REG_RD_INSTR_MODE_EN_LSB		20
+#define CQSPI_REG_RD_INSTR_DUMMY_LSB		24
+#define CQSPI_REG_RD_INSTR_TYPE_INSTR_MASK	0x3
+#define CQSPI_REG_RD_INSTR_TYPE_ADDR_MASK	0x3
+#define CQSPI_REG_RD_INSTR_TYPE_DATA_MASK	0x3
+#define CQSPI_REG_RD_INSTR_DUMMY_MASK		0x1F
+
+#define CQSPI_REG_WR_INSTR			0x08
+#define CQSPI_REG_WR_INSTR_OPCODE_LSB		0
+#define CQSPI_REG_WR_INSTR_TYPE_ADDR_LSB	12
+#define CQSPI_REG_WR_INSTR_TYPE_DATA_LSB	16
+
+#define CQSPI_REG_DELAY				0x0C
+#define CQSPI_REG_DELAY_TSLCH_LSB		0
+#define CQSPI_REG_DELAY_TCHSH_LSB		8
+#define CQSPI_REG_DELAY_TSD2D_LSB		16
+#define CQSPI_REG_DELAY_TSHSL_LSB		24
+#define CQSPI_REG_DELAY_TSLCH_MASK		0xFF
+#define CQSPI_REG_DELAY_TCHSH_MASK		0xFF
+#define CQSPI_REG_DELAY_TSD2D_MASK		0xFF
+#define CQSPI_REG_DELAY_TSHSL_MASK		0xFF
+
+#define CQSPI_REG_READCAPTURE			0x10
+#define CQSPI_REG_READCAPTURE_BYPASS_LSB	0
+#define CQSPI_REG_READCAPTURE_DELAY_LSB		1
+#define CQSPI_REG_READCAPTURE_DELAY_MASK	0xF
+
+#define CQSPI_REG_SIZE				0x14
+#define CQSPI_REG_SIZE_ADDRESS_LSB		0
+#define CQSPI_REG_SIZE_PAGE_LSB			4
+#define CQSPI_REG_SIZE_BLOCK_LSB		16
+#define CQSPI_REG_SIZE_ADDRESS_MASK		0xF
+#define CQSPI_REG_SIZE_PAGE_MASK		0xFFF
+#define CQSPI_REG_SIZE_BLOCK_MASK		0x3F
+
+#define CQSPI_REG_SRAMPARTITION			0x18
+#define CQSPI_REG_INDIRECTTRIGGER		0x1C
+
+#define CQSPI_REG_DMA				0x20
+#define CQSPI_REG_DMA_SINGLE_LSB		0
+#define CQSPI_REG_DMA_BURST_LSB			8
+#define CQSPI_REG_DMA_SINGLE_MASK		0xFF
+#define CQSPI_REG_DMA_BURST_MASK		0xFF
+
+#define CQSPI_REG_REMAP				0x24
+#define CQSPI_REG_MODE_BIT			0x28
+
+#define CQSPI_REG_SRAMLEVEL			0x2C
+#define CQSPI_REG_SRAMLEVEL_RD_LSB		0
+#define CQSPI_REG_SRAMLEVEL_WR_LSB		16
+#define CQSPI_REG_SRAMLEVEL_RD_MASK		0xFFFF
+#define CQSPI_REG_SRAMLEVEL_WR_MASK		0xFFFF
+
+#define CQSPI_REG_IRQSTATUS			0x40
+#define CQSPI_REG_IRQMASK			0x44
+
+#define CQSPI_REG_INDIRECTRD			0x60
+#define CQSPI_REG_INDIRECTRD_START_MASK		BIT(0)
+#define CQSPI_REG_INDIRECTRD_CANCEL_MASK	BIT(1)
+#define CQSPI_REG_INDIRECTRD_DONE_MASK		BIT(5)
+
+#define CQSPI_REG_INDIRECTRDWATERMARK		0x64
+#define CQSPI_REG_INDIRECTRDSTARTADDR		0x68
+#define CQSPI_REG_INDIRECTRDBYTES		0x6C
+
+#define CQSPI_REG_CMDCTRL			0x90
+#define CQSPI_REG_CMDCTRL_EXECUTE_MASK		BIT(0)
+#define CQSPI_REG_CMDCTRL_INPROGRESS_MASK	BIT(1)
+#define CQSPI_REG_CMDCTRL_WR_BYTES_LSB		12
+#define CQSPI_REG_CMDCTRL_WR_EN_LSB		15
+#define CQSPI_REG_CMDCTRL_ADD_BYTES_LSB		16
+#define CQSPI_REG_CMDCTRL_ADDR_EN_LSB		19
+#define CQSPI_REG_CMDCTRL_RD_BYTES_LSB		20
+#define CQSPI_REG_CMDCTRL_RD_EN_LSB		23
+#define CQSPI_REG_CMDCTRL_OPCODE_LSB		24
+#define CQSPI_REG_CMDCTRL_WR_BYTES_MASK		0x7
+#define CQSPI_REG_CMDCTRL_ADD_BYTES_MASK	0x3
+#define CQSPI_REG_CMDCTRL_RD_BYTES_MASK		0x7
+
+#define CQSPI_REG_INDIRECTWR			0x70
+#define CQSPI_REG_INDIRECTWR_START_MASK		BIT(0)
+#define CQSPI_REG_INDIRECTWR_CANCEL_MASK	BIT(1)
+#define CQSPI_REG_INDIRECTWR_DONE_MASK		BIT(5)
+
+#define CQSPI_REG_INDIRECTWRWATERMARK		0x74
+#define CQSPI_REG_INDIRECTWRSTARTADDR		0x78
+#define CQSPI_REG_INDIRECTWRBYTES		0x7C
+
+#define CQSPI_REG_CMDADDRESS			0x94
+#define CQSPI_REG_CMDREADDATALOWER		0xA0
+#define CQSPI_REG_CMDREADDATAUPPER		0xA4
+#define CQSPI_REG_CMDWRITEDATALOWER		0xA8
+#define CQSPI_REG_CMDWRITEDATAUPPER		0xAC
+
+/* Interrupt status bits */
+#define CQSPI_REG_IRQ_MODE_ERR			BIT(0)
+#define CQSPI_REG_IRQ_UNDERFLOW			BIT(1)
+#define CQSPI_REG_IRQ_IND_COMP			BIT(2)
+#define CQSPI_REG_IRQ_IND_RD_REJECT		BIT(3)
+#define CQSPI_REG_IRQ_WR_PROTECTED_ERR		BIT(4)
+#define CQSPI_REG_IRQ_ILLEGAL_AHB_ERR		BIT(5)
+#define CQSPI_REG_IRQ_WATERMARK			BIT(6)
+#define CQSPI_REG_IRQ_IND_RD_OVERFLOW		BIT(12)
+
+#define CQSPI_IRQ_STATUS_ERR		(CQSPI_REG_IRQ_MODE_ERR		| \
+					 CQSPI_REG_IRQ_IND_RD_REJECT	| \
+					 CQSPI_REG_IRQ_WR_PROTECTED_ERR	| \
+					 CQSPI_REG_IRQ_ILLEGAL_AHB_ERR)
+
+#define CQSPI_IRQ_MASK_RD		(CQSPI_REG_IRQ_WATERMARK	| \
+					 CQSPI_REG_IRQ_IND_RD_OVERFLOW	| \
+					 CQSPI_REG_IRQ_IND_COMP)
+
+#define CQSPI_IRQ_MASK_WR		(CQSPI_REG_IRQ_IND_COMP		| \
+					 CQSPI_REG_IRQ_WATERMARK	| \
+					 CQSPI_REG_IRQ_UNDERFLOW)
+
+#define CQSPI_IRQ_STATUS_MASK		0x1FFFE
+
+#define CQSPI_REG_IS_IDLE(base)						\
+		((readl(base + CQSPI_REG_CONFIG) >>			\
+			CQSPI_REG_CONFIG_IDLE_LSB) & 0x1)
+
+#define CQSPI_GET_RD_SRAM_LEVEL(reg_base)				\
+		(((readl(reg_base + CQSPI_REG_SRAMLEVEL)) >>		\
+		CQSPI_REG_SRAMLEVEL_RD_LSB) & CQSPI_REG_SRAMLEVEL_RD_MASK)
+
+static void cqspi_fifo_read(void *dest, const void *src_ahb_addr,
+			    unsigned int bytes)
+{
+	unsigned int temp;
+	int remaining = bytes;
+	unsigned int *dest_ptr = (unsigned int *)dest;
+	unsigned int *src_ptr = (unsigned int *)src_ahb_addr;
+
+	while (remaining > CQSPI_FIFO_WIDTH) {
+		*dest_ptr = readl(src_ptr);
+		dest_ptr++;
+		remaining -= CQSPI_FIFO_WIDTH;
+	}
+	if (remaining > 0) {
+		/* dangling bytes */
+		temp = readl(src_ptr);
+		memcpy(dest_ptr, &temp, remaining);
+	}
+}
+
+static void cqspi_fifo_write(void *dest_ahb_addr,
+			     const void *src, unsigned int bytes)
+{
+	unsigned int temp;
+	int remaining = bytes;
+	unsigned int *dest_ptr = (unsigned int *)dest_ahb_addr;
+	unsigned int *src_ptr = (unsigned int *)src;
+
+	while (remaining > CQSPI_FIFO_WIDTH) {
+		writel(*src_ptr, dest_ptr);
+		src_ptr++;
+		remaining -= CQSPI_FIFO_WIDTH;
+	}
+	if (remaining > 0) {
+		/* dangling bytes */
+		memcpy(&temp, src_ptr, remaining);
+		writel(temp, dest_ptr);
+	}
+}
+
+static int cqspi_find_chipselect(struct spi_nor *nor)
+{
+	int cs = -1;
+	struct cqspi_st *cqspi = nor->priv;
+
+	for (cs = 0; cs < CQSPI_MAX_CHIPSELECT; cs++)
+		if (nor == &cqspi->f_pdata[cs].nor)
+			break;
+	return cs;
+}
+
+static unsigned int cqspi_calc_rdreg(struct spi_nor *nor, u8 opcode)
+{
+	unsigned int rdreg = 0;
+	struct cqspi_st *cqspi = nor->priv;
+	struct cqspi_flash_pdata *f_pdata;
+
+	f_pdata = &cqspi->f_pdata[cqspi->current_cs];
+
+	if (nor->flash_read == SPI_NOR_QUAD)
+		rdreg |= (CQSPI_INST_TYPE_QUAD
+			  << CQSPI_REG_RD_INSTR_TYPE_DATA_LSB);
+	return rdreg;
+}
+
+static unsigned int cqspi_wait_idle(struct cqspi_st *cqspi)
+{
+	void __iomem *reg_base = cqspi->iobase;
+
+	if (wait_on_timeout(CQSPI_TIMEOUT_MS,
+		CQSPI_REG_IS_IDLE(reg_base))) {
+		/* Timeout, in busy mode. */
+		dev_err(cqspi->dev, "QSPI is still busy after %llums timeout.\n",
+			CQSPI_TIMEOUT_MS);
+		return -ETIMEDOUT;
+	}
+
+	return 0;
+}
+
+static int cqspi_exec_flash_cmd(struct cqspi_st *cqspi, unsigned int reg)
+{
+	void __iomem *reg_base = cqspi->iobase;
+
+	/* Write the CMDCTRL without start execution. */
+	writel(reg, reg_base + CQSPI_REG_CMDCTRL);
+	/* Start execute */
+	reg |= CQSPI_REG_CMDCTRL_EXECUTE_MASK;
+	writel(reg, reg_base + CQSPI_REG_CMDCTRL);
+
+	if (wait_on_timeout(CQSPI_TIMEOUT_MS,
+		(readl(reg_base + CQSPI_REG_CMDCTRL) &
+			CQSPI_REG_CMDCTRL_INPROGRESS_MASK) == 0)) {
+		dev_err(cqspi->dev, "flash cmd execute time out (0x%08x)\n",
+			readl(reg_base + CQSPI_REG_CMDCTRL));
+		return -EIO;
+	}
+
+	/* Polling QSPI idle status. */
+	return cqspi_wait_idle(cqspi);
+}
+
+static int cqspi_command_read(struct spi_nor *nor,
+			      const u8 *txbuf, unsigned n_tx,
+			      u8 *rxbuf, unsigned n_rx)
+{
+	unsigned int reg;
+	unsigned int read_len;
+	int status;
+	struct cqspi_st *cqspi = nor->priv;
+	void __iomem *reg_base = cqspi->iobase;
+	unsigned int rdreg;
+
+	if (!n_rx || n_rx > CQSPI_STIG_DATA_LEN_MAX || rxbuf == NULL) {
+		dev_err(nor->dev,
+			"Invalid input argument, len %d rxbuf 0x%08x\n", n_rx,
+			(unsigned int)rxbuf);
+		return -EINVAL;
+	}
+
+	reg = txbuf[0] << CQSPI_REG_CMDCTRL_OPCODE_LSB;
+
+	rdreg = cqspi_calc_rdreg(nor, txbuf[0]);
+	writel(rdreg, reg_base + CQSPI_REG_RD_INSTR);
+
+	reg |= (0x1 << CQSPI_REG_CMDCTRL_RD_EN_LSB);
+
+	/* 0 means 1 byte. */
+	reg |= (((n_rx - 1) & CQSPI_REG_CMDCTRL_RD_BYTES_MASK)
+		<< CQSPI_REG_CMDCTRL_RD_BYTES_LSB);
+	status = cqspi_exec_flash_cmd(cqspi, reg);
+	if (status != 0)
+		return status;
+
+	reg = readl(reg_base + CQSPI_REG_CMDREADDATALOWER);
+
+	/* Put the read value into rx_buf */
+	read_len = (n_rx > 4) ? 4 : n_rx;
+	memcpy(rxbuf, &reg, read_len);
+	rxbuf += read_len;
+
+	if (n_rx > 4) {
+		reg = readl(reg_base + CQSPI_REG_CMDREADDATAUPPER);
+
+		read_len = n_rx - read_len;
+		memcpy(rxbuf, &reg, read_len);
+	}
+
+	return 0;
+}
+
+static __maybe_unused int cqspi_command_write(struct spi_nor *nor,
+				u8 opcode, const u8 *txbuf, unsigned n_tx)
+{
+	unsigned int reg;
+	unsigned int data;
+	struct cqspi_st *cqspi = nor->priv;
+	void __iomem *reg_base = cqspi->iobase;
+
+	if (n_tx > 4 || (n_tx && txbuf == NULL)) {
+		dev_err(nor->dev,
+			"Invalid input argument, cmdlen %d txbuf 0x%08x\n",
+			n_tx, (unsigned int)txbuf);
+		return -EINVAL;
+	}
+
+	reg = opcode << CQSPI_REG_CMDCTRL_OPCODE_LSB;
+	if (n_tx) {
+		reg |= (0x1 << CQSPI_REG_CMDCTRL_WR_EN_LSB);
+		reg |= ((n_tx - 1) & CQSPI_REG_CMDCTRL_WR_BYTES_MASK)
+		    << CQSPI_REG_CMDCTRL_WR_BYTES_LSB;
+		data = 0;
+		memcpy(&data, txbuf, n_tx);
+		writel(data, reg_base + CQSPI_REG_CMDWRITEDATALOWER);
+	}
+
+	return cqspi_exec_flash_cmd(cqspi, reg);
+}
+
+static int cqspi_command_write_addr(struct spi_nor *nor,
+				    u8 opcode, unsigned int addr)
+{
+	unsigned int reg;
+	struct cqspi_st *cqspi = nor->priv;
+	void __iomem *reg_base = cqspi->iobase;
+
+	reg = opcode << CQSPI_REG_CMDCTRL_OPCODE_LSB;
+	reg |= (0x1 << CQSPI_REG_CMDCTRL_ADDR_EN_LSB);
+	reg |= ((nor->addr_width - 1) & CQSPI_REG_CMDCTRL_ADD_BYTES_MASK)
+		<< CQSPI_REG_CMDCTRL_ADD_BYTES_LSB;
+
+	writel(addr, reg_base + CQSPI_REG_CMDADDRESS);
+
+	return cqspi_exec_flash_cmd(cqspi, reg);
+}
+
+static int cqspi_indirect_read_setup(struct spi_nor *nor,
+				     unsigned int from_addr)
+{
+	struct cqspi_st *cqspi = nor->priv;
+	unsigned int ahb_base = (unsigned int) cqspi->ahb_base;
+	void __iomem *reg_base = cqspi->iobase;
+	unsigned int dummy_clk = 0;
+	unsigned int dummy_bytes;
+	unsigned int reg = 0;
+
+	writel(ahb_base & CQSPI_INDIRECTTRIGGER_ADDR_MASK,
+	       reg_base + CQSPI_REG_INDIRECTTRIGGER);
+	writel(from_addr, reg_base + CQSPI_REG_INDIRECTRDSTARTADDR);
+
+	reg = nor->read_opcode << CQSPI_REG_RD_INSTR_OPCODE_LSB;
+	reg |= cqspi_calc_rdreg(nor, nor->read_opcode);
+
+	/* Setup dummy clock cycles */
+	dummy_bytes = nor->read_dummy / 8;
+
+	if (dummy_bytes) {
+		struct cqspi_flash_pdata *f_pdata;
+
+		f_pdata = &cqspi->f_pdata[cqspi->current_cs];
+
+		if (dummy_bytes > CQSPI_DUMMY_BYTES_MAX)
+			dummy_bytes = CQSPI_DUMMY_BYTES_MAX;
+
+		reg |= (1 << CQSPI_REG_RD_INSTR_MODE_EN_LSB);
+		/* Set mode bits high to ensure chip doesn't enter XIP */
+		writel(0xFF, reg_base + CQSPI_REG_MODE_BIT);
+
+		/* Convert to clock cycles. */
+		dummy_clk = dummy_bytes * CQSPI_DUMMY_CLKS_PER_BYTE;
+		/* Need to subtract the mode byte (8 clocks). */
+		dummy_clk -= CQSPI_DUMMY_CLKS_PER_BYTE;
+
+		if (dummy_clk)
+			reg |= (dummy_clk & CQSPI_REG_RD_INSTR_DUMMY_MASK)
+			    << CQSPI_REG_RD_INSTR_DUMMY_LSB;
+	}
+
+	writel(reg, reg_base + CQSPI_REG_RD_INSTR);
+
+	/* Set address width */
+	reg = readl(reg_base + CQSPI_REG_SIZE);
+	reg &= ~CQSPI_REG_SIZE_ADDRESS_MASK;
+	reg |= (nor->addr_width) - 1;
+	writel(reg, reg_base + CQSPI_REG_SIZE);
+	return 0;
+}
+
+static int cqspi_indirect_read_execute(struct spi_nor *nor,
+				       u8 *rxbuf, unsigned n_rx)
+{
+	int ret = 0;
+	unsigned int reg = 0;
+	unsigned int bytes_to_read = 0;
+	unsigned int watermark;
+	struct cqspi_st *cqspi = nor->priv;
+	void __iomem *reg_base = cqspi->iobase;
+	void __iomem *ahb_base = cqspi->ahb_base;
+	int remaining = (int)n_rx;
+
+	watermark = cqspi->fifo_depth * CQSPI_FIFO_WIDTH / 2;
+	writel(watermark, reg_base + CQSPI_REG_INDIRECTRDWATERMARK);
+	writel(remaining, reg_base + CQSPI_REG_INDIRECTRDBYTES);
+
+	/* Clear all interrupts. */
+	writel(CQSPI_IRQ_STATUS_MASK, reg_base + CQSPI_REG_IRQSTATUS);
+
+	cqspi->irq_mask = CQSPI_IRQ_MASK_RD;
+	writel(cqspi->irq_mask, reg_base + CQSPI_REG_IRQMASK);
+
+	writel(CQSPI_REG_INDIRECTRD_START_MASK,
+		reg_base + CQSPI_REG_INDIRECTRD);
+
+	while (remaining > 0) {
+		unsigned int irq_status;
+
+		ret = wait_on_timeout(CQSPI_READ_TIMEOUT_MS,
+			readl(reg_base + CQSPI_REG_IRQSTATUS) & cqspi->irq_mask);
+
+		irq_status = readl(reg_base + CQSPI_REG_IRQSTATUS);
+		bytes_to_read = CQSPI_GET_RD_SRAM_LEVEL(reg_base);
+
+		/* Clear all interrupts. */
+		writel(irq_status, reg_base + CQSPI_REG_IRQSTATUS);
+
+		if (!ret && bytes_to_read == 0) {
+			dev_err(nor->dev, "Indirect read timeout, no bytes\n");
+			ret = -ETIMEDOUT;
+			goto failrd;
+		}
+
+		while (bytes_to_read != 0) {
+			bytes_to_read *= CQSPI_FIFO_WIDTH;
+			bytes_to_read = bytes_to_read > remaining
+					? remaining : bytes_to_read;
+			cqspi_fifo_read(rxbuf, ahb_base, bytes_to_read);
+			rxbuf += bytes_to_read;
+			remaining -= bytes_to_read;
+			bytes_to_read = CQSPI_GET_RD_SRAM_LEVEL(reg_base);
+		}
+	}
+
+	/* Check indirect done status */
+	if (wait_on_timeout(CQSPI_TIMEOUT_MS,
+		readl(reg_base + CQSPI_REG_INDIRECTRD) &
+			CQSPI_REG_INDIRECTRD_DONE_MASK)) {
+		dev_err(nor->dev,
+			"Indirect read completion error 0x%08x\n", reg);
+		ret = -ETIMEDOUT;
+		goto failrd;
+	}
+
+	/* Disable interrupt */
+	writel(0, reg_base + CQSPI_REG_IRQMASK);
+
+	/* Clear indirect completion status */
+	writel(CQSPI_REG_INDIRECTRD_DONE_MASK, reg_base + CQSPI_REG_INDIRECTRD);
+
+	return 0;
+
+ failrd:
+	/* Disable interrupt */
+	writel(0, reg_base + CQSPI_REG_IRQMASK);
+
+	/* Cancel the indirect read */
+	writel(CQSPI_REG_INDIRECTWR_CANCEL_MASK,
+	       reg_base + CQSPI_REG_INDIRECTRD);
+	return ret;
+}
+
+static __maybe_unused int cqspi_indirect_write_setup(struct spi_nor *nor,
+						     unsigned int to_addr)
+{
+	unsigned int reg;
+	struct cqspi_st *cqspi = nor->priv;
+	void __iomem *reg_base = cqspi->iobase;
+
+	/* Set opcode. */
+	reg = nor->program_opcode << CQSPI_REG_WR_INSTR_OPCODE_LSB;
+	writel(reg, reg_base + CQSPI_REG_WR_INSTR);
+	reg = cqspi_calc_rdreg(nor, nor->program_opcode);
+	writel(reg, reg_base + CQSPI_REG_RD_INSTR);
+
+	writel(to_addr, reg_base + CQSPI_REG_INDIRECTWRSTARTADDR);
+
+	reg = readl(reg_base + CQSPI_REG_SIZE);
+	reg &= ~CQSPI_REG_SIZE_ADDRESS_MASK;
+	reg |= (nor->addr_width - 1);
+	writel(reg, reg_base + CQSPI_REG_SIZE);
+	return 0;
+}
+
+static __maybe_unused int cqspi_indirect_write_execute(struct spi_nor *nor,
+						const u8 *txbuf, unsigned n_tx)
+{
+	int ret;
+	unsigned int reg = 0;
+	struct cqspi_st *cqspi = nor->priv;
+	void __iomem *reg_base = cqspi->iobase;
+	void __iomem *ahb_base = cqspi->ahb_base;
+	int remaining = (int)n_tx;
+	unsigned int page_size;
+	unsigned int write_bytes;
+
+	page_size = nor->page_size;
+
+	writel(remaining, reg_base + CQSPI_REG_INDIRECTWRBYTES);
+
+	writel(CQSPI_REG_SRAM_THRESHOLD_BYTES, reg_base +
+	       CQSPI_REG_INDIRECTWRWATERMARK);
+
+	/* Clear all interrupts. */
+	writel(CQSPI_IRQ_STATUS_MASK, reg_base + CQSPI_REG_IRQSTATUS);
+
+	cqspi->irq_mask = CQSPI_IRQ_MASK_WR;
+	writel(cqspi->irq_mask, reg_base + CQSPI_REG_IRQMASK);
+
+	writel(CQSPI_REG_INDIRECTWR_START_MASK,
+	       reg_base + CQSPI_REG_INDIRECTWR);
+
+	/* Write a page or remaining bytes. */
+	write_bytes = remaining > page_size ? page_size : remaining;
+	/* Fill up the data at the beginning */
+	cqspi_fifo_write(ahb_base, txbuf, write_bytes);
+	txbuf += write_bytes;
+	remaining -= write_bytes;
+
+	while (remaining > 0) {
+		ret = wait_on_timeout(CQSPI_READ_TIMEOUT_MS,
+			readl(reg_base + CQSPI_REG_IRQSTATUS) & cqspi->irq_mask);
+
+		/* Clear all interrupts. */
+		writel(CQSPI_IRQ_STATUS_MASK, reg_base + CQSPI_REG_IRQSTATUS);
+
+		if (ret < 0) {
+			dev_err(nor->dev, "Indirect write timeout\n");
+			ret = -ETIMEDOUT;
+			goto failwr;
+		}
+
+		write_bytes = remaining > page_size ? page_size : remaining;
+		cqspi_fifo_write(ahb_base, txbuf, write_bytes);
+		txbuf += write_bytes;
+		remaining -= write_bytes;
+
+		writel(cqspi->irq_mask, reg_base + CQSPI_REG_IRQMASK);
+	}
+	ret = wait_on_timeout(CQSPI_READ_TIMEOUT_MS,
+			readl(reg_base + CQSPI_REG_IRQSTATUS) & cqspi->irq_mask);
+
+	/* Clear all interrupts. */
+	writel(CQSPI_IRQ_STATUS_MASK, reg_base + CQSPI_REG_IRQSTATUS);
+	if (ret < 0) {
+		dev_err(nor->dev, "Indirect write timeout\n");
+		ret = -ETIMEDOUT;
+		goto failwr;
+	}
+
+	/* Check indirect done status */
+	if (wait_on_timeout(CQSPI_TIMEOUT_MS,
+		readl(reg_base + CQSPI_REG_INDIRECTWR)
+			& CQSPI_REG_INDIRECTWR_DONE_MASK)) {
+		dev_err(nor->dev,
+			"Indirect write completion error 0x%08x\n", reg);
+		ret = -ETIMEDOUT;
+		goto failwr;
+	}
+
+	/* Disable interrupt. */
+	writel(0, reg_base + CQSPI_REG_IRQMASK);
+
+	/* Clear indirect completion status */
+	writel(CQSPI_REG_INDIRECTWR_DONE_MASK, reg_base + CQSPI_REG_INDIRECTWR);
+
+	cqspi_wait_idle(cqspi);
+
+	return 0;
+
+failwr:
+	/* Disable interrupt. */
+	writel(0, reg_base + CQSPI_REG_IRQMASK);
+
+	/* Cancel the indirect write */
+	writel(CQSPI_REG_INDIRECTWR_CANCEL_MASK,
+	       reg_base + CQSPI_REG_INDIRECTWR);
+	return ret;
+}
+
+static void cqspi_write(struct spi_nor *nor, loff_t to,
+			size_t len, size_t *retlen, const u_char *buf)
+{
+	int ret;
+
+	if (!IS_ENABLED(CONFIG_MTD_WRITE))
+		return;
+
+	ret = cqspi_indirect_write_setup(nor, to);
+	if (ret == 0) {
+		ret = cqspi_indirect_write_execute(nor, buf, len);
+		if (ret == 0)
+			*retlen += len;
+	}
+}
+
+static int cqspi_read(struct spi_nor *nor, loff_t from,
+		      size_t len, size_t *retlen, u_char *buf)
+{
+	int ret;
+
+	ret = cqspi_indirect_read_setup(nor, from);
+	if (ret == 0) {
+		ret = cqspi_indirect_read_execute(nor, buf, len);
+		if (ret == 0)
+			*retlen += len;
+	}
+	return ret;
+}
+
+static int cqspi_erase(struct spi_nor *nor, loff_t offs)
+{
+	int ret;
+
+	/* Send write enable, then erase commands. */
+	ret = nor->write_reg(nor, SPINOR_OP_WREN, NULL, 0, 0);
+	if (ret)
+		return ret;
+
+	/* Set up command buffer. */
+	ret = cqspi_command_write_addr(nor, nor->erase_opcode, offs);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static unsigned int calculate_ticks_for_ns(unsigned int ref_clk_hz,
+					   unsigned int ns_val)
+{
+	unsigned int ticks;
+
+	ticks = ref_clk_hz;
+	ticks /= 1000;
+	ticks *= ns_val;
+	ticks += 999999;
+	ticks /= 1000000;
+	return ticks;
+}
+
+static void cqspi_delay(struct cqspi_st *cqspi,
+			unsigned int ref_clk_hz, unsigned int sclk_hz)
+{
+	void __iomem *reg_base = cqspi->iobase;
+	struct cqspi_flash_pdata *f_pdata;
+	unsigned int ref_clk_ns;
+	unsigned int sclk_ns;
+	unsigned int tshsl, tchsh, tslch, tsd2d;
+	unsigned int reg;
+	unsigned int tsclk;
+
+	if (cqspi->no_reconfig)
+		return;
+
+	f_pdata = &cqspi->f_pdata[cqspi->current_cs];
+
+	/* Convert to ns. */
+	ref_clk_ns = NSEC_PER_SEC / ref_clk_hz;
+
+	/* Convert to ns. */
+	sclk_ns = NSEC_PER_SEC / sclk_hz;
+
+	/* calculate the number of ref ticks for one sclk tick */
+	tsclk = (ref_clk_hz + sclk_hz - 1) / sclk_hz;
+
+	tshsl = calculate_ticks_for_ns(ref_clk_hz, f_pdata->tshsl_ns);
+	/* this particular value must be at least one sclk */
+	if (tshsl < tsclk)
+		tshsl = tsclk;
+
+	tchsh = calculate_ticks_for_ns(ref_clk_hz, f_pdata->tchsh_ns);
+	tslch = calculate_ticks_for_ns(ref_clk_hz, f_pdata->tslch_ns);
+	tsd2d = calculate_ticks_for_ns(ref_clk_hz, f_pdata->tsd2d_ns);
+
+	reg = ((tshsl & CQSPI_REG_DELAY_TSHSL_MASK)
+	       << CQSPI_REG_DELAY_TSHSL_LSB);
+	reg |= ((tchsh & CQSPI_REG_DELAY_TCHSH_MASK)
+		<< CQSPI_REG_DELAY_TCHSH_LSB);
+	reg |= ((tslch & CQSPI_REG_DELAY_TSLCH_MASK)
+		<< CQSPI_REG_DELAY_TSLCH_LSB);
+	reg |= ((tsd2d & CQSPI_REG_DELAY_TSD2D_MASK)
+		<< CQSPI_REG_DELAY_TSD2D_LSB);
+	writel(reg, reg_base + CQSPI_REG_DELAY);
+}
+
+static void cqspi_config_baudrate_div(struct cqspi_st *cqspi,
+				      unsigned int ref_clk_hz,
+				      unsigned int sclk_hz)
+{
+	void __iomem *reg_base = cqspi->iobase;
+	unsigned int reg;
+	unsigned int div;
+
+	reg = readl(reg_base + CQSPI_REG_CONFIG);
+	reg &= ~(CQSPI_REG_CONFIG_BAUD_MASK << CQSPI_REG_CONFIG_BAUD_LSB);
+
+	div = ref_clk_hz / sclk_hz;
+
+	/* Recalculate the baudrate divisor based on QSPI specification. */
+	if (div > 32)
+		div = 32;
+
+	/* Check if even number. */
+	if (div & 1)
+		div = (div / 2);
+	else
+		div = (div / 2) - 1;
+
+	div = (div & CQSPI_REG_CONFIG_BAUD_MASK) << CQSPI_REG_CONFIG_BAUD_LSB;
+	reg |= div;
+	writel(reg, reg_base + CQSPI_REG_CONFIG);
+}
+
+static void cqspi_readdata_capture(struct cqspi_st *cqspi,
+				   unsigned int bypass, unsigned int delay)
+{
+	void __iomem *reg_base = cqspi->iobase;
+	unsigned int reg;
+
+	if (cqspi->no_reconfig)
+		return;
+
+	reg = readl(reg_base + CQSPI_REG_READCAPTURE);
+
+	if (bypass)
+		reg |= (1 << CQSPI_REG_READCAPTURE_BYPASS_LSB);
+	else
+		reg &= ~(1 << CQSPI_REG_READCAPTURE_BYPASS_LSB);
+
+	reg &= ~(CQSPI_REG_READCAPTURE_DELAY_MASK
+		 << CQSPI_REG_READCAPTURE_DELAY_LSB);
+
+	reg |= ((delay & CQSPI_REG_READCAPTURE_DELAY_MASK)
+		<< CQSPI_REG_READCAPTURE_DELAY_LSB);
+
+	writel(reg, reg_base + CQSPI_REG_READCAPTURE);
+}
+
+static void cqspi_chipselect(struct cqspi_st *cqspi,
+			     unsigned int chip_select,
+			     unsigned int decoder_enable)
+{
+	void __iomem *reg_base = cqspi->iobase;
+	unsigned int reg;
+
+	reg = readl(reg_base + CQSPI_REG_CONFIG);
+	if (decoder_enable) {
+		reg |= CQSPI_REG_CONFIG_DECODE_MASK;
+	} else {
+		reg &= ~CQSPI_REG_CONFIG_DECODE_MASK;
+
+		/* Convert CS if without decoder.
+		 * CS0 to 4b'1110
+		 * CS1 to 4b'1101
+		 * CS2 to 4b'1011
+		 * CS3 to 4b'0111
+		 */
+		chip_select = 0xF & ~(1 << chip_select);
+	}
+
+	reg &= ~(CQSPI_REG_CONFIG_CHIPSELECT_MASK
+		 << CQSPI_REG_CONFIG_CHIPSELECT_LSB);
+	reg |= (chip_select & CQSPI_REG_CONFIG_CHIPSELECT_MASK)
+	    << CQSPI_REG_CONFIG_CHIPSELECT_LSB;
+	writel(reg, reg_base + CQSPI_REG_CONFIG);
+}
+
+static void cqspi_controller_enable(struct cqspi_st *cqspi)
+{
+	void __iomem *reg_base = cqspi->iobase;
+	unsigned int reg;
+
+	reg = readl(reg_base + CQSPI_REG_CONFIG);
+	reg |= CQSPI_REG_CONFIG_ENABLE_MASK;
+	writel(reg, reg_base + CQSPI_REG_CONFIG);
+}
+
+static void cqspi_controller_disable(struct cqspi_st *cqspi)
+{
+	void __iomem *reg_base = cqspi->iobase;
+	unsigned int reg;
+
+	reg = readl(reg_base + CQSPI_REG_CONFIG);
+	reg &= ~CQSPI_REG_CONFIG_ENABLE_MASK;
+	writel(reg, reg_base + CQSPI_REG_CONFIG);
+}
+
+static void cqspi_switch_cs(struct cqspi_st *cqspi, unsigned int cs)
+{
+	unsigned int reg;
+	struct cqspi_flash_pdata *f_pdata = &cqspi->f_pdata[cs];
+	void __iomem *reg_base = cqspi->iobase;
+	struct spi_nor *nor = &f_pdata->nor;
+
+	cqspi_controller_disable(cqspi);
+
+	/* configure page size and block size. */
+	reg = readl(reg_base + CQSPI_REG_SIZE);
+	reg &= ~(CQSPI_REG_SIZE_PAGE_MASK << CQSPI_REG_SIZE_PAGE_LSB);
+	reg &= ~(CQSPI_REG_SIZE_BLOCK_MASK << CQSPI_REG_SIZE_BLOCK_LSB);
+	reg |= (nor->page_size << CQSPI_REG_SIZE_PAGE_LSB);
+	reg |= (f_pdata->block_size << CQSPI_REG_SIZE_BLOCK_LSB);
+	reg &= ~CQSPI_REG_SIZE_ADDRESS_MASK;
+	reg |= (nor->addr_width - 1);
+	writel(reg, reg_base + CQSPI_REG_SIZE);
+
+	/* configure the chip select */
+	cqspi_chipselect(cqspi, cs, cqspi->ext_decoder);
+
+	cqspi_controller_enable(cqspi);
+}
+
+static int cqspi_prep(struct spi_nor *nor, enum spi_nor_ops ops)
+{
+	struct cqspi_st *cqspi = nor->priv;
+	int cs = cqspi_find_chipselect(nor);
+	struct cqspi_flash_pdata *f_pdata;
+	unsigned int sclk;
+
+	/* Switch chip select. */
+	if (cqspi->current_cs != cs) {
+		cqspi->current_cs = cs;
+		cqspi_switch_cs(cqspi, cs);
+	}
+
+	/* Setup baudrate divisor and delays */
+	f_pdata = &cqspi->f_pdata[cqspi->current_cs];
+	sclk = f_pdata->clk_rate;
+	if (cqspi->sclk != sclk) {
+		cqspi->sclk = sclk;
+		cqspi_controller_disable(cqspi);
+		cqspi_config_baudrate_div(cqspi,
+					  cqspi->master_ref_clk_hz, sclk);
+		cqspi_delay(cqspi, cqspi->master_ref_clk_hz, sclk);
+		cqspi_readdata_capture(cqspi, 1, f_pdata->read_delay);
+		cqspi_controller_enable(cqspi);
+	}
+	return 0;
+}
+
+static int cqspi_read_reg(struct spi_nor *nor, u8 opcode, u8 *buf, int len)
+{
+	int ret;
+
+	cqspi_prep(nor, SPI_NOR_OPS_READ);
+
+	ret = cqspi_command_read(nor, &opcode, 1, buf, len);
+	return ret;
+}
+
+static int cqspi_write_reg(struct spi_nor *nor, u8 opcode, u8 *buf, int len,
+			   int write_enable)
+{
+	int ret = 0;
+
+	if (!IS_ENABLED(CONFIG_MTD_WRITE))
+		return -ENOTSUPP;
+
+	cqspi_prep(nor, SPI_NOR_OPS_WRITE);
+
+	ret = cqspi_command_write(nor, opcode, buf, len);
+	return ret;
+}
+
+static int cqspi_of_get_flash_pdata(struct device_d *dev,
+				    struct cqspi_flash_pdata *f_pdata,
+				    struct device_node *np)
+{
+	struct cqspi_st *cqspi = dev->priv;
+	void __iomem *reg_base = cqspi->iobase;
+
+	if (!np) {
+		f_pdata->block_size = (readl(reg_base + CQSPI_REG_SIZE) >>
+					CQSPI_REG_SIZE_BLOCK_LSB) &
+					CQSPI_REG_SIZE_BLOCK_MASK;
+
+		cqspi->no_reconfig = true;
+
+		return 0;
+	}
+
+	if (of_property_read_u32(np, "cdns,block-size", &f_pdata->block_size)) {
+		dev_err(dev, "couldn't determine block-size\n");
+		return -ENXIO;
+	}
+
+	if (of_property_read_u32(np, "cdns,read-delay", &f_pdata->read_delay)) {
+		dev_err(dev, "couldn't determine read-delay\n");
+		return -ENXIO;
+	}
+
+	if (of_property_read_u32(np, "cdns,tshsl-ns", &f_pdata->tshsl_ns)) {
+		dev_err(dev, "couldn't determine tshsl-ns\n");
+		return -ENXIO;
+	}
+
+	if (of_property_read_u32(np, "cdns,tsd2d-ns", &f_pdata->tsd2d_ns)) {
+		dev_err(dev, "couldn't determine tsd2d-ns\n");
+		return -ENXIO;
+	}
+
+	if (of_property_read_u32(np, "cdns,tchsh-ns", &f_pdata->tchsh_ns)) {
+		dev_err(dev, "couldn't determine tchsh-ns\n");
+		return -ENXIO;
+	}
+
+	if (of_property_read_u32(np, "cdns,tslch-ns", &f_pdata->tslch_ns)) {
+		dev_err(dev, "couldn't determine tslch-ns\n");
+		return -ENXIO;
+	}
+
+	if (of_property_read_u32(np, "spi-max-frequency", &f_pdata->clk_rate)) {
+		dev_err(dev, "couldn't determine spi-max-frequency\n");
+		return -ENXIO;
+	}
+
+	return 0;
+}
+
+static int cqspi_parse_dt(struct cqspi_st *cqspi)
+{
+	struct device_node *np = cqspi->dev->device_node;
+	struct device_d *dev = cqspi->dev;
+
+	if (of_property_read_u32(np, "ext-decoder", &cqspi->ext_decoder)) {
+		dev_err(dev, "couldn't determine ext-decoder\n");
+		return -ENXIO;
+	}
+
+	if (of_property_read_u32(np, "fifo-depth", &cqspi->fifo_depth)) {
+		dev_err(dev, "couldn't determine fifo-depth\n");
+		return -ENXIO;
+	}
+
+	return 0;
+}
+
+static int cqspi_setup_flash(struct device_d *dev,
+			     struct cqspi_flash_pdata *f_pdata,
+			     struct device_node *np)
+{
+	struct cqspi_st *cqspi = dev->priv;
+	struct mtd_info *mtd;
+	struct spi_nor *nor;
+	int ret;
+
+	ret = cqspi_of_get_flash_pdata(dev, f_pdata, np);
+	if (ret)
+		goto probe_failed;
+
+	nor = &f_pdata->nor;
+	mtd = &f_pdata->mtd;
+
+	nor->mtd = mtd;
+
+	if (np) {
+		nor->dev = xzalloc(sizeof(*nor->dev));
+
+		strcpy(nor->dev->name, np->name);
+
+		nor->dev->device_node = np;
+		nor->dev->id = DEVICE_ID_SINGLE;
+		nor->dev->parent = dev;
+		ret = register_device(nor->dev);
+
+		if (ret)
+			return ret;
+
+		mtd->parent = nor->dev;
+	} else {
+		nor->dev = dev;
+	}
+
+	nor->priv = cqspi;
+	mtd->priv = nor;
+
+	nor->read_reg = cqspi_read_reg;
+	nor->write_reg = cqspi_write_reg;
+	nor->read = cqspi_read;
+	nor->write = cqspi_write;
+	nor->erase = cqspi_erase;
+
+	ret = spi_nor_scan(nor, NULL, SPI_NOR_QUAD);
+	if (ret)
+		goto probe_failed;
+
+	ret = add_mtd_device(mtd, NULL, DEVICE_ID_DYNAMIC);
+	if (ret)
+		goto probe_failed;
+
+	return 0;
+
+probe_failed:
+	dev_err(dev, "probing for flashchip failed\n");
+	return ret;
+
+}
+
+static void cqspi_controller_init(struct cqspi_st *cqspi)
+{
+	cqspi_controller_disable(cqspi);
+
+	/* Configure the remap address register, no remap */
+	writel(0, cqspi->iobase + CQSPI_REG_REMAP);
+
+	/* Disable all interrupts */
+	writel(0, cqspi->iobase + CQSPI_REG_IRQMASK);
+
+	cqspi_controller_enable(cqspi);
+}
+
+static int cqspi_probe(struct device_d *dev)
+{
+	struct device_node *np = dev->device_node;
+	struct cqspi_st *cqspi;
+	struct cadence_qspi_platform_data *pdata = dev->platform_data;
+	int ret;
+
+	cqspi = kzalloc(sizeof(*cqspi), GFP_KERNEL);
+	if (!cqspi)
+		return -ENOMEM;
+
+	cqspi->dev = dev;
+	dev->priv = cqspi;
+
+	if (pdata) {
+		cqspi->ext_decoder = pdata->ext_decoder;
+		cqspi->fifo_depth = pdata->fifo_depth;
+	} else {
+		ret = cqspi_parse_dt(cqspi);
+		if (ret) {
+			dev_err(dev, "Get platform data failed.\n");
+			return -ENODEV;
+		}
+	}
+
+	cqspi->qspi_clk = clk_get(dev, "qspi_clk");
+	if (IS_ERR(cqspi->qspi_clk)) {
+		dev_err(dev, "cannot get qspi clk\n");
+		ret = PTR_ERR(cqspi->qspi_clk);
+		goto probe_failed;
+	}
+	cqspi->master_ref_clk_hz = clk_get_rate(cqspi->qspi_clk);
+
+	clk_enable(cqspi->qspi_clk);
+
+	cqspi->iobase = dev_request_mem_region(dev, 0);
+	if (IS_ERR(cqspi->iobase)) {
+		dev_err(dev, "dev_request_mem_region 0 failed\n");
+		ret = PTR_ERR(cqspi->iobase);
+		goto probe_failed;
+	}
+
+	cqspi->ahb_base = dev_request_mem_region(dev, 1);
+	if (IS_ERR(cqspi->ahb_base)) {
+		dev_err(dev, "dev_request_mem_region 0 failed\n");
+		ret = PTR_ERR(cqspi->ahb_base);
+		goto probe_failed;
+	}
+
+	cqspi_wait_idle(cqspi);
+	cqspi_controller_init(cqspi);
+	cqspi->current_cs = -1;
+	cqspi->sclk = 0;
+
+	if (!dev->device_node) {
+		struct cqspi_flash_pdata *f_pdata;
+
+		f_pdata = &cqspi->f_pdata[0];
+
+		ret = cqspi_setup_flash(dev, f_pdata, NULL);
+		if (ret)
+			goto probe_failed;
+	} else {
+		/* Get flash device data */
+		for_each_available_child_of_node(dev->device_node, np) {
+			struct cqspi_flash_pdata *f_pdata;
+			unsigned int cs;
+			if (of_property_read_u32(np, "reg", &cs)) {
+				dev_err(dev, "couldn't determine chip select\n");
+				return -ENXIO;
+			}
+			if (cs > CQSPI_MAX_CHIPSELECT) {
+				dev_err(dev, "chip select %d out of range\n", cs);
+				return -ENXIO;
+			}
+			f_pdata = &cqspi->f_pdata[cs];
+
+			ret = cqspi_setup_flash(dev, f_pdata, np);
+			if (ret)
+				goto probe_failed;
+		}
+	}
+
+	dev_info(dev, "Cadence QSPI NOR flash driver\n");
+	return 0;
+
+probe_failed:
+	dev_err(dev, "Cadence QSPI NOR probe failed\n");
+	return ret;
+}
+
+static __maybe_unused struct of_device_id cqspi_dt_ids[] = {
+	{.compatible = "cdns,qspi-nor",},
+	{ /* end of table */ }
+};
+
+static struct driver_d cqspi_driver = {
+	.name = "cadence_qspi",
+	.probe = cqspi_probe,
+	.of_compatible = DRV_OF_COMPAT(cqspi_dt_ids),
+};
+device_platform_driver(cqspi_driver);
diff --git a/include/platform_data/cadence_qspi.h b/include/platform_data/cadence_qspi.h
new file mode 100644
index 000000000000..4930edce507e
--- /dev/null
+++ b/include/platform_data/cadence_qspi.h
@@ -0,0 +1,9 @@
+#ifndef __INCLUDE_PLATFORM_DATA_CADENCE_QSPI_H
+#define __INCLUDE_PLATFORM_DATA_CADENCE_QSPI_H
+
+struct cadence_qspi_platform_data {
+	unsigned int ext_decoder;
+	unsigned int fifo_depth;
+};
+
+#endif /* __INCLUDE_PLATFORM_DATA_CADENCE_QSPI_H */
-- 
2.1.4


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