1 files changed, 636 insertions, 0 deletions

diff --git a/drivers/spi/spi-cadence-xspi.c b/drivers/spi/spi-cadence-xspi.c
new file mode 100644
index 0000000000..b7e04b03be
--- /dev/null
+++ b/drivers/spi/spi-cadence-xspi.c
@@ -0,0 +1,636 @@
+// SPDX-License-Identifier: GPL-2.0+
+// Cadence XSPI flash controller driver
+// Copyright (C) 2020-21 Cadence
+
+#include <linux/completion.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/errno.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/spi/spi.h>
+#include <linux/spi/spi-mem.h>
+#include <linux/bitfield.h>
+#include <linux/limits.h>
+#include <linux/log2.h>
+
+#define CDNS_XSPI_MAGIC_NUM_VALUE	0x6522
+#define CDNS_XSPI_MAX_BANKS		8
+#define CDNS_XSPI_NAME			"cadence-xspi"
+
+/*
+ * Note: below are additional auxiliary registers to
+ * configure XSPI controller pin-strap settings
+ */
+
+/* PHY DQ timing register */
+#define CDNS_XSPI_CCP_PHY_DQ_TIMING		0x0000
+
+/* PHY DQS timing register */
+#define CDNS_XSPI_CCP_PHY_DQS_TIMING		0x0004
+
+/* PHY gate loopback control register */
+#define CDNS_XSPI_CCP_PHY_GATE_LPBCK_CTRL	0x0008
+
+/* PHY DLL slave control register */
+#define CDNS_XSPI_CCP_PHY_DLL_SLAVE_CTRL	0x0010
+
+/* DLL PHY control register */
+#define CDNS_XSPI_DLL_PHY_CTRL			0x1034
+
+/* Command registers */
+#define CDNS_XSPI_CMD_REG_0			0x0000
+#define CDNS_XSPI_CMD_REG_1			0x0004
+#define CDNS_XSPI_CMD_REG_2			0x0008
+#define CDNS_XSPI_CMD_REG_3			0x000C
+#define CDNS_XSPI_CMD_REG_4			0x0010
+#define CDNS_XSPI_CMD_REG_5			0x0014
+
+/* Command status registers */
+#define CDNS_XSPI_CMD_STATUS_REG		0x0044
+
+/* Controller status register */
+#define CDNS_XSPI_CTRL_STATUS_REG		0x0100
+#define CDNS_XSPI_INIT_COMPLETED		BIT(16)
+#define CDNS_XSPI_INIT_LEGACY			BIT(9)
+#define CDNS_XSPI_INIT_FAIL			BIT(8)
+#define CDNS_XSPI_CTRL_BUSY			BIT(7)
+
+/* Controller interrupt status register */
+#define CDNS_XSPI_INTR_STATUS_REG		0x0110
+#define CDNS_XSPI_STIG_DONE			BIT(23)
+#define CDNS_XSPI_SDMA_ERROR			BIT(22)
+#define CDNS_XSPI_SDMA_TRIGGER			BIT(21)
+#define CDNS_XSPI_CMD_IGNRD_EN			BIT(20)
+#define CDNS_XSPI_DDMA_TERR_EN			BIT(18)
+#define CDNS_XSPI_CDMA_TREE_EN			BIT(17)
+#define CDNS_XSPI_CTRL_IDLE_EN			BIT(16)
+
+#define CDNS_XSPI_TRD_COMP_INTR_STATUS		0x0120
+#define CDNS_XSPI_TRD_ERR_INTR_STATUS		0x0130
+#define CDNS_XSPI_TRD_ERR_INTR_EN		0x0134
+
+/* Controller interrupt enable register */
+#define CDNS_XSPI_INTR_ENABLE_REG		0x0114
+#define CDNS_XSPI_INTR_EN			BIT(31)
+#define CDNS_XSPI_STIG_DONE_EN			BIT(23)
+#define CDNS_XSPI_SDMA_ERROR_EN			BIT(22)
+#define CDNS_XSPI_SDMA_TRIGGER_EN		BIT(21)
+
+#define CDNS_XSPI_INTR_MASK (CDNS_XSPI_INTR_EN | \
+	CDNS_XSPI_STIG_DONE_EN  | \
+	CDNS_XSPI_SDMA_ERROR_EN | \
+	CDNS_XSPI_SDMA_TRIGGER_EN)
+
+/* Controller config register */
+#define CDNS_XSPI_CTRL_CONFIG_REG		0x0230
+#define CDNS_XSPI_CTRL_WORK_MODE		GENMASK(6, 5)
+
+#define CDNS_XSPI_WORK_MODE_DIRECT		0
+#define CDNS_XSPI_WORK_MODE_STIG		1
+#define CDNS_XSPI_WORK_MODE_ACMD		3
+
+/* SDMA trigger transaction registers */
+#define CDNS_XSPI_SDMA_SIZE_REG			0x0240
+#define CDNS_XSPI_SDMA_TRD_INFO_REG		0x0244
+#define CDNS_XSPI_SDMA_DIR			BIT(8)
+
+/* Controller features register */
+#define CDNS_XSPI_CTRL_FEATURES_REG		0x0F04
+#define CDNS_XSPI_NUM_BANKS			GENMASK(25, 24)
+#define CDNS_XSPI_DMA_DATA_WIDTH		BIT(21)
+#define CDNS_XSPI_NUM_THREADS			GENMASK(3, 0)
+
+/* Controller version register */
+#define CDNS_XSPI_CTRL_VERSION_REG		0x0F00
+#define CDNS_XSPI_MAGIC_NUM			GENMASK(31, 16)
+#define CDNS_XSPI_CTRL_REV			GENMASK(7, 0)
+
+/* STIG Profile 1.0 instruction fields (split into registers) */
+#define CDNS_XSPI_CMD_INSTR_TYPE		GENMASK(6, 0)
+#define CDNS_XSPI_CMD_P1_R1_ADDR0		GENMASK(31, 24)
+#define CDNS_XSPI_CMD_P1_R2_ADDR1		GENMASK(7, 0)
+#define CDNS_XSPI_CMD_P1_R2_ADDR2		GENMASK(15, 8)
+#define CDNS_XSPI_CMD_P1_R2_ADDR3		GENMASK(23, 16)
+#define CDNS_XSPI_CMD_P1_R2_ADDR4		GENMASK(31, 24)
+#define CDNS_XSPI_CMD_P1_R3_ADDR5		GENMASK(7, 0)
+#define CDNS_XSPI_CMD_P1_R3_CMD			GENMASK(23, 16)
+#define CDNS_XSPI_CMD_P1_R3_NUM_ADDR_BYTES	GENMASK(30, 28)
+#define CDNS_XSPI_CMD_P1_R4_ADDR_IOS		GENMASK(1, 0)
+#define CDNS_XSPI_CMD_P1_R4_CMD_IOS		GENMASK(9, 8)
+#define CDNS_XSPI_CMD_P1_R4_BANK		GENMASK(14, 12)
+
+/* STIG data sequence instruction fields (split into registers) */
+#define CDNS_XSPI_CMD_DSEQ_R2_DCNT_L		GENMASK(31, 16)
+#define CDNS_XSPI_CMD_DSEQ_R3_DCNT_H		GENMASK(15, 0)
+#define CDNS_XSPI_CMD_DSEQ_R3_NUM_OF_DUMMY	GENMASK(25, 20)
+#define CDNS_XSPI_CMD_DSEQ_R4_BANK		GENMASK(14, 12)
+#define CDNS_XSPI_CMD_DSEQ_R4_DATA_IOS		GENMASK(9, 8)
+#define CDNS_XSPI_CMD_DSEQ_R4_DIR		BIT(4)
+
+/* STIG command status fields */
+#define CDNS_XSPI_CMD_STATUS_COMPLETED		BIT(15)
+#define CDNS_XSPI_CMD_STATUS_FAILED		BIT(14)
+#define CDNS_XSPI_CMD_STATUS_DQS_ERROR		BIT(3)
+#define CDNS_XSPI_CMD_STATUS_CRC_ERROR		BIT(2)
+#define CDNS_XSPI_CMD_STATUS_BUS_ERROR		BIT(1)
+#define CDNS_XSPI_CMD_STATUS_INV_SEQ_ERROR	BIT(0)
+
+#define CDNS_XSPI_STIG_DONE_FLAG		BIT(0)
+#define CDNS_XSPI_TRD_STATUS			0x0104
+
+/* Helper macros for filling command registers */
+#define CDNS_XSPI_CMD_FLD_P1_INSTR_CMD_1(op, data_phase) ( \
+	FIELD_PREP(CDNS_XSPI_CMD_INSTR_TYPE, (data_phase) ? \
+		CDNS_XSPI_STIG_INSTR_TYPE_1 : CDNS_XSPI_STIG_INSTR_TYPE_0) | \
+	FIELD_PREP(CDNS_XSPI_CMD_P1_R1_ADDR0, (op)->addr.val & 0xff))
+
+#define CDNS_XSPI_CMD_FLD_P1_INSTR_CMD_2(op) ( \
+	FIELD_PREP(CDNS_XSPI_CMD_P1_R2_ADDR1, ((op)->addr.val >> 8)  & 0xFF) | \
+	FIELD_PREP(CDNS_XSPI_CMD_P1_R2_ADDR2, ((op)->addr.val >> 16) & 0xFF) | \
+	FIELD_PREP(CDNS_XSPI_CMD_P1_R2_ADDR3, ((op)->addr.val >> 24) & 0xFF) | \
+	FIELD_PREP(CDNS_XSPI_CMD_P1_R2_ADDR4, ((op)->addr.val >> 32) & 0xFF))
+
+#define CDNS_XSPI_CMD_FLD_P1_INSTR_CMD_3(op) ( \
+	FIELD_PREP(CDNS_XSPI_CMD_P1_R3_ADDR5, ((op)->addr.val >> 40) & 0xFF) | \
+	FIELD_PREP(CDNS_XSPI_CMD_P1_R3_CMD, (op)->cmd.opcode) | \
+	FIELD_PREP(CDNS_XSPI_CMD_P1_R3_NUM_ADDR_BYTES, (op)->addr.nbytes))
+
+#define CDNS_XSPI_CMD_FLD_P1_INSTR_CMD_4(op, chipsel) ( \
+	FIELD_PREP(CDNS_XSPI_CMD_P1_R4_ADDR_IOS, ilog2((op)->addr.buswidth)) | \
+	FIELD_PREP(CDNS_XSPI_CMD_P1_R4_CMD_IOS, ilog2((op)->cmd.buswidth)) | \
+	FIELD_PREP(CDNS_XSPI_CMD_P1_R4_BANK, chipsel))
+
+#define CDNS_XSPI_CMD_FLD_DSEQ_CMD_1(op) \
+	FIELD_PREP(CDNS_XSPI_CMD_INSTR_TYPE, CDNS_XSPI_STIG_INSTR_TYPE_DATA_SEQ)
+
+#define CDNS_XSPI_CMD_FLD_DSEQ_CMD_2(op) \
+	FIELD_PREP(CDNS_XSPI_CMD_DSEQ_R2_DCNT_L, (op)->data.nbytes & 0xFFFF)
+
+#define CDNS_XSPI_CMD_FLD_DSEQ_CMD_3(op) ( \
+	FIELD_PREP(CDNS_XSPI_CMD_DSEQ_R3_DCNT_H, \
+		((op)->data.nbytes >> 16) & 0xffff) | \
+	FIELD_PREP(CDNS_XSPI_CMD_DSEQ_R3_NUM_OF_DUMMY, \
+		  (op)->dummy.buswidth != 0 ? \
+		  (((op)->dummy.nbytes * 8) / (op)->dummy.buswidth) : \
+		  0))
+
+#define CDNS_XSPI_CMD_FLD_DSEQ_CMD_4(op, chipsel) ( \
+	FIELD_PREP(CDNS_XSPI_CMD_DSEQ_R4_BANK, chipsel) | \
+	FIELD_PREP(CDNS_XSPI_CMD_DSEQ_R4_DATA_IOS, \
+		ilog2((op)->data.buswidth)) | \
+	FIELD_PREP(CDNS_XSPI_CMD_DSEQ_R4_DIR, \
+		((op)->data.dir == SPI_MEM_DATA_IN) ? \
+		CDNS_XSPI_STIG_CMD_DIR_READ : CDNS_XSPI_STIG_CMD_DIR_WRITE))
+
+enum cdns_xspi_stig_instr_type {
+	CDNS_XSPI_STIG_INSTR_TYPE_0,
+	CDNS_XSPI_STIG_INSTR_TYPE_1,
+	CDNS_XSPI_STIG_INSTR_TYPE_DATA_SEQ = 127,
+};
+
+enum cdns_xspi_sdma_dir {
+	CDNS_XSPI_SDMA_DIR_READ,
+	CDNS_XSPI_SDMA_DIR_WRITE,
+};
+
+enum cdns_xspi_stig_cmd_dir {
+	CDNS_XSPI_STIG_CMD_DIR_READ,
+	CDNS_XSPI_STIG_CMD_DIR_WRITE,
+};
+
+struct cdns_xspi_dev {
+	struct platform_device *pdev;
+	struct device *dev;
+
+	void __iomem *iobase;
+	void __iomem *auxbase;
+	void __iomem *sdmabase;
+
+	int irq;
+	int cur_cs;
+	unsigned int sdmasize;
+
+	struct completion cmd_complete;
+	struct completion auto_cmd_complete;
+	struct completion sdma_complete;
+	bool sdma_error;
+
+	void *in_buffer;
+	const void *out_buffer;
+
+	u8 hw_num_banks;
+};
+
+static int cdns_xspi_wait_for_controller_idle(struct cdns_xspi_dev *cdns_xspi)
+{
+	u32 ctrl_stat;
+
+	return readl_relaxed_poll_timeout(cdns_xspi->iobase +
+					  CDNS_XSPI_CTRL_STATUS_REG,
+					  ctrl_stat,
+					  ((ctrl_stat &
+					    CDNS_XSPI_CTRL_BUSY) == 0),
+					  100, 1000);
+}
+
+static void cdns_xspi_trigger_command(struct cdns_xspi_dev *cdns_xspi,
+				      u32 cmd_regs[6])
+{
+	writel(cmd_regs[5], cdns_xspi->iobase + CDNS_XSPI_CMD_REG_5);
+	writel(cmd_regs[4], cdns_xspi->iobase + CDNS_XSPI_CMD_REG_4);
+	writel(cmd_regs[3], cdns_xspi->iobase + CDNS_XSPI_CMD_REG_3);
+	writel(cmd_regs[2], cdns_xspi->iobase + CDNS_XSPI_CMD_REG_2);
+	writel(cmd_regs[1], cdns_xspi->iobase + CDNS_XSPI_CMD_REG_1);
+	writel(cmd_regs[0], cdns_xspi->iobase + CDNS_XSPI_CMD_REG_0);
+}
+
+static int cdns_xspi_check_command_status(struct cdns_xspi_dev *cdns_xspi)
+{
+	int ret = 0;
+	u32 cmd_status = readl(cdns_xspi->iobase + CDNS_XSPI_CMD_STATUS_REG);
+
+	if (cmd_status & CDNS_XSPI_CMD_STATUS_COMPLETED) {
+		if ((cmd_status & CDNS_XSPI_CMD_STATUS_FAILED) != 0) {
+			if (cmd_status & CDNS_XSPI_CMD_STATUS_DQS_ERROR) {
+				dev_err(cdns_xspi->dev,
+					"Incorrect DQS pulses detected\n");
+				ret = -EPROTO;
+			}
+			if (cmd_status & CDNS_XSPI_CMD_STATUS_CRC_ERROR) {
+				dev_err(cdns_xspi->dev,
+					"CRC error received\n");
+				ret = -EPROTO;
+			}
+			if (cmd_status & CDNS_XSPI_CMD_STATUS_BUS_ERROR) {
+				dev_err(cdns_xspi->dev,
+					"Error resp on system DMA interface\n");
+				ret = -EPROTO;
+			}
+			if (cmd_status & CDNS_XSPI_CMD_STATUS_INV_SEQ_ERROR) {
+				dev_err(cdns_xspi->dev,
+					"Invalid command sequence detected\n");
+				ret = -EPROTO;
+			}
+		}
+	} else {
+		dev_err(cdns_xspi->dev, "Fatal err - command not completed\n");
+		ret = -EPROTO;
+	}
+
+	return ret;
+}
+
+static void cdns_xspi_set_interrupts(struct cdns_xspi_dev *cdns_xspi,
+				     bool enabled)
+{
+	u32 intr_enable;
+
+	intr_enable = readl(cdns_xspi->iobase + CDNS_XSPI_INTR_ENABLE_REG);
+	if (enabled)
+		intr_enable |= CDNS_XSPI_INTR_MASK;
+	else
+		intr_enable &= ~CDNS_XSPI_INTR_MASK;
+	writel(intr_enable, cdns_xspi->iobase + CDNS_XSPI_INTR_ENABLE_REG);
+}
+
+static int cdns_xspi_controller_init(struct cdns_xspi_dev *cdns_xspi)
+{
+	u32 ctrl_ver;
+	u32 ctrl_features;
+	u16 hw_magic_num;
+
+	ctrl_ver = readl(cdns_xspi->iobase + CDNS_XSPI_CTRL_VERSION_REG);
+	hw_magic_num = FIELD_GET(CDNS_XSPI_MAGIC_NUM, ctrl_ver);
+	if (hw_magic_num != CDNS_XSPI_MAGIC_NUM_VALUE) {
+		dev_err(cdns_xspi->dev,
+			"Incorrect XSPI magic number: %x, expected: %x\n",
+			hw_magic_num, CDNS_XSPI_MAGIC_NUM_VALUE);
+		return -EIO;
+	}
+
+	ctrl_features = readl(cdns_xspi->iobase + CDNS_XSPI_CTRL_FEATURES_REG);
+	cdns_xspi->hw_num_banks = FIELD_GET(CDNS_XSPI_NUM_BANKS, ctrl_features);
+	cdns_xspi_set_interrupts(cdns_xspi, false);
+
+	return 0;
+}
+
+static void cdns_xspi_sdma_handle(struct cdns_xspi_dev *cdns_xspi)
+{
+	u32 sdma_size, sdma_trd_info;
+	u8 sdma_dir;
+
+	sdma_size = readl(cdns_xspi->iobase + CDNS_XSPI_SDMA_SIZE_REG);
+	sdma_trd_info = readl(cdns_xspi->iobase + CDNS_XSPI_SDMA_TRD_INFO_REG);
+	sdma_dir = FIELD_GET(CDNS_XSPI_SDMA_DIR, sdma_trd_info);
+
+	switch (sdma_dir) {
+	case CDNS_XSPI_SDMA_DIR_READ:
+		ioread8_rep(cdns_xspi->sdmabase,
+			    cdns_xspi->in_buffer, sdma_size);
+		break;
+
+	case CDNS_XSPI_SDMA_DIR_WRITE:
+		iowrite8_rep(cdns_xspi->sdmabase,
+			     cdns_xspi->out_buffer, sdma_size);
+		break;
+	}
+}
+
+static int cdns_xspi_send_stig_command(struct cdns_xspi_dev *cdns_xspi,
+				       const struct spi_mem_op *op,
+				       bool data_phase)
+{
+	u32 cmd_regs[6];
+	u32 cmd_status;
+	int ret;
+
+	ret = cdns_xspi_wait_for_controller_idle(cdns_xspi);
+	if (ret < 0)
+		return -EIO;
+
+	writel(FIELD_PREP(CDNS_XSPI_CTRL_WORK_MODE, CDNS_XSPI_WORK_MODE_STIG),
+	       cdns_xspi->iobase + CDNS_XSPI_CTRL_CONFIG_REG);
+
+	cdns_xspi_set_interrupts(cdns_xspi, true);
+	cdns_xspi->sdma_error = false;
+
+	memset(cmd_regs, 0, sizeof(cmd_regs));
+	cmd_regs[1] = CDNS_XSPI_CMD_FLD_P1_INSTR_CMD_1(op, data_phase);
+	cmd_regs[2] = CDNS_XSPI_CMD_FLD_P1_INSTR_CMD_2(op);
+	cmd_regs[3] = CDNS_XSPI_CMD_FLD_P1_INSTR_CMD_3(op);
+	cmd_regs[4] = CDNS_XSPI_CMD_FLD_P1_INSTR_CMD_4(op,
+						       cdns_xspi->cur_cs);
+
+	cdns_xspi_trigger_command(cdns_xspi, cmd_regs);
+
+	if (data_phase) {
+		cmd_regs[0] = CDNS_XSPI_STIG_DONE_FLAG;
+		cmd_regs[1] = CDNS_XSPI_CMD_FLD_DSEQ_CMD_1(op);
+		cmd_regs[2] = CDNS_XSPI_CMD_FLD_DSEQ_CMD_2(op);
+		cmd_regs[3] = CDNS_XSPI_CMD_FLD_DSEQ_CMD_3(op);
+		cmd_regs[4] = CDNS_XSPI_CMD_FLD_DSEQ_CMD_4(op,
+							   cdns_xspi->cur_cs);
+
+		cdns_xspi->in_buffer = op->data.buf.in;
+		cdns_xspi->out_buffer = op->data.buf.out;
+
+		cdns_xspi_trigger_command(cdns_xspi, cmd_regs);
+
+		wait_for_completion(&cdns_xspi->sdma_complete);
+		if (cdns_xspi->sdma_error) {
+			cdns_xspi_set_interrupts(cdns_xspi, false);
+			return -EIO;
+		}
+		cdns_xspi_sdma_handle(cdns_xspi);
+	}
+
+	wait_for_completion(&cdns_xspi->cmd_complete);
+	cdns_xspi_set_interrupts(cdns_xspi, false);
+
+	cmd_status = cdns_xspi_check_command_status(cdns_xspi);
+	if (cmd_status)
+		return -EPROTO;
+
+	return 0;
+}
+
+static int cdns_xspi_mem_op(struct cdns_xspi_dev *cdns_xspi,
+			    struct spi_mem *mem,
+			    const struct spi_mem_op *op)
+{
+	enum spi_mem_data_dir dir = op->data.dir;
+
+	if (cdns_xspi->cur_cs != spi_get_chipselect(mem->spi, 0))
+		cdns_xspi->cur_cs = spi_get_chipselect(mem->spi, 0);
+
+	return cdns_xspi_send_stig_command(cdns_xspi, op,
+					   (dir != SPI_MEM_NO_DATA));
+}
+
+static int cdns_xspi_mem_op_execute(struct spi_mem *mem,
+				    const struct spi_mem_op *op)
+{
+	struct cdns_xspi_dev *cdns_xspi =
+		spi_controller_get_devdata(mem->spi->controller);
+	int ret = 0;
+
+	ret = cdns_xspi_mem_op(cdns_xspi, mem, op);
+
+	return ret;
+}
+
+static int cdns_xspi_adjust_mem_op_size(struct spi_mem *mem, struct spi_mem_op *op)
+{
+	struct cdns_xspi_dev *cdns_xspi =
+		spi_controller_get_devdata(mem->spi->controller);
+
+	op->data.nbytes = clamp_val(op->data.nbytes, 0, cdns_xspi->sdmasize);
+
+	return 0;
+}
+
+static const struct spi_controller_mem_ops cadence_xspi_mem_ops = {
+	.exec_op = cdns_xspi_mem_op_execute,
+	.adjust_op_size = cdns_xspi_adjust_mem_op_size,
+};
+
+static irqreturn_t cdns_xspi_irq_handler(int this_irq, void *dev)
+{
+	struct cdns_xspi_dev *cdns_xspi = dev;
+	u32 irq_status;
+	irqreturn_t result = IRQ_NONE;
+
+	irq_status = readl(cdns_xspi->iobase + CDNS_XSPI_INTR_STATUS_REG);
+	writel(irq_status, cdns_xspi->iobase + CDNS_XSPI_INTR_STATUS_REG);
+
+	if (irq_status &
+	    (CDNS_XSPI_SDMA_ERROR | CDNS_XSPI_SDMA_TRIGGER |
+	     CDNS_XSPI_STIG_DONE)) {
+		if (irq_status & CDNS_XSPI_SDMA_ERROR) {
+			dev_err(cdns_xspi->dev,
+				"Slave DMA transaction error\n");
+			cdns_xspi->sdma_error = true;
+			complete(&cdns_xspi->sdma_complete);
+		}
+
+		if (irq_status & CDNS_XSPI_SDMA_TRIGGER)
+			complete(&cdns_xspi->sdma_complete);
+
+		if (irq_status & CDNS_XSPI_STIG_DONE)
+			complete(&cdns_xspi->cmd_complete);
+
+		result = IRQ_HANDLED;
+	}
+
+	irq_status = readl(cdns_xspi->iobase + CDNS_XSPI_TRD_COMP_INTR_STATUS);
+	if (irq_status) {
+		writel(irq_status,
+		       cdns_xspi->iobase + CDNS_XSPI_TRD_COMP_INTR_STATUS);
+
+		complete(&cdns_xspi->auto_cmd_complete);
+
+		result = IRQ_HANDLED;
+	}
+
+	return result;
+}
+
+static int cdns_xspi_of_get_plat_data(struct platform_device *pdev)
+{
+	struct device_node *node_prop = pdev->dev.of_node;
+	struct device_node *node_child;
+	unsigned int cs;
+
+	for_each_child_of_node(node_prop, node_child) {
+		if (!of_device_is_available(node_child))
+			continue;
+
+		if (of_property_read_u32(node_child, "reg", &cs)) {
+			dev_err(&pdev->dev, "Couldn't get memory chip select\n");
+			of_node_put(node_child);
+			return -ENXIO;
+		} else if (cs >= CDNS_XSPI_MAX_BANKS) {
+			dev_err(&pdev->dev, "reg (cs) parameter value too large\n");
+			of_node_put(node_child);
+			return -ENXIO;
+		}
+	}
+
+	return 0;
+}
+
+static void cdns_xspi_print_phy_config(struct cdns_xspi_dev *cdns_xspi)
+{
+	struct device *dev = cdns_xspi->dev;
+
+	dev_info(dev, "PHY configuration\n");
+	dev_info(dev, "   * xspi_dll_phy_ctrl: %08x\n",
+		 readl(cdns_xspi->iobase + CDNS_XSPI_DLL_PHY_CTRL));
+	dev_info(dev, "   * phy_dq_timing: %08x\n",
+		 readl(cdns_xspi->auxbase + CDNS_XSPI_CCP_PHY_DQ_TIMING));
+	dev_info(dev, "   * phy_dqs_timing: %08x\n",
+		 readl(cdns_xspi->auxbase + CDNS_XSPI_CCP_PHY_DQS_TIMING));
+	dev_info(dev, "   * phy_gate_loopback_ctrl: %08x\n",
+		 readl(cdns_xspi->auxbase + CDNS_XSPI_CCP_PHY_GATE_LPBCK_CTRL));
+	dev_info(dev, "   * phy_dll_slave_ctrl: %08x\n",
+		 readl(cdns_xspi->auxbase + CDNS_XSPI_CCP_PHY_DLL_SLAVE_CTRL));
+}
+
+static int cdns_xspi_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct spi_controller *host = NULL;
+	struct cdns_xspi_dev *cdns_xspi = NULL;
+	struct resource *res;
+	int ret;
+
+	host = devm_spi_alloc_host(dev, sizeof(*cdns_xspi));
+	if (!host)
+		return -ENOMEM;
+
+	host->mode_bits = SPI_3WIRE | SPI_TX_DUAL  | SPI_TX_QUAD  |
+		SPI_RX_DUAL | SPI_RX_QUAD | SPI_TX_OCTAL | SPI_RX_OCTAL |
+		SPI_MODE_0  | SPI_MODE_3;
+
+	host->mem_ops = &cadence_xspi_mem_ops;
+	host->dev.of_node = pdev->dev.of_node;
+	host->bus_num = -1;
+
+	platform_set_drvdata(pdev, host);
+
+	cdns_xspi = spi_controller_get_devdata(host);
+	cdns_xspi->pdev = pdev;
+	cdns_xspi->dev = &pdev->dev;
+	cdns_xspi->cur_cs = 0;
+
+	init_completion(&cdns_xspi->cmd_complete);
+	init_completion(&cdns_xspi->auto_cmd_complete);
+	init_completion(&cdns_xspi->sdma_complete);
+
+	ret = cdns_xspi_of_get_plat_data(pdev);
+	if (ret)
+		return -ENODEV;
+
+	cdns_xspi->iobase = devm_platform_ioremap_resource_byname(pdev, "io");
+	if (IS_ERR(cdns_xspi->iobase)) {
+		dev_err(dev, "Failed to remap controller base address\n");
+		return PTR_ERR(cdns_xspi->iobase);
+	}
+
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "sdma");
+	cdns_xspi->sdmabase = devm_ioremap_resource(dev, res);
+	if (IS_ERR(cdns_xspi->sdmabase))
+		return PTR_ERR(cdns_xspi->sdmabase);
+	cdns_xspi->sdmasize = resource_size(res);
+
+	cdns_xspi->auxbase = devm_platform_ioremap_resource_byname(pdev, "aux");
+	if (IS_ERR(cdns_xspi->auxbase)) {
+		dev_err(dev, "Failed to remap AUX address\n");
+		return PTR_ERR(cdns_xspi->auxbase);
+	}
+
+	cdns_xspi->irq = platform_get_irq(pdev, 0);
+	if (cdns_xspi->irq < 0)
+		return -ENXIO;
+
+	ret = devm_request_irq(dev, cdns_xspi->irq, cdns_xspi_irq_handler,
+			       IRQF_SHARED, pdev->name, cdns_xspi);
+	if (ret) {
+		dev_err(dev, "Failed to request IRQ: %d\n", cdns_xspi->irq);
+		return ret;
+	}
+
+	cdns_xspi_print_phy_config(cdns_xspi);
+
+	ret = cdns_xspi_controller_init(cdns_xspi);
+	if (ret) {
+		dev_err(dev, "Failed to initialize controller\n");
+		return ret;
+	}
+
+	host->num_chipselect = 1 << cdns_xspi->hw_num_banks;
+
+	ret = devm_spi_register_controller(dev, host);
+	if (ret) {
+		dev_err(dev, "Failed to register SPI host\n");
+		return ret;
+	}
+
+	dev_info(dev, "Successfully registered SPI host\n");
+
+	return 0;
+}
+
+static const struct of_device_id cdns_xspi_of_match[] = {
+	{
+		.compatible = "cdns,xspi-nor",
+	},
+	{ /* end of table */}
+};
+MODULE_DEVICE_TABLE(of, cdns_xspi_of_match);
+
+static struct platform_driver cdns_xspi_platform_driver = {
+	.probe          = cdns_xspi_probe,
+	.remove         = NULL,
+	.driver = {
+		.name = CDNS_XSPI_NAME,
+		.of_match_table = cdns_xspi_of_match,
+	},
+};
+
+module_platform_driver(cdns_xspi_platform_driver);
+
+MODULE_DESCRIPTION("Cadence XSPI Controller Driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:" CDNS_XSPI_NAME);
+MODULE_AUTHOR("Konrad Kociolek <konrad@cadence.com>");
+MODULE_AUTHOR("Jayshri Pawar <jpawar@cadence.com>");
+MODULE_AUTHOR("Parshuram Thombare <pthombar@cadence.com>");