Add add SPI-NAND Flash controller driver for EN7581

Merge series from Lorenzo Bianconi <lorenzo@kernel.org>:

Introduce support for SPI-NAND driver of the Airoha NAND Flash Interface
found on Airoha ARM EN7581 SoCs.

3 files changed, 1140 insertions, 0 deletions

diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index 17325e0b7bd5..86f6115f417c 100644
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -57,6 +57,16 @@ config SPI_MEM
 
 comment "SPI Master Controller Drivers"
 
+config SPI_AIROHA_SNFI
+	tristate "Airoha SPI NAND Flash Interface"
+	depends on ARCH_AIROHA || COMPILE_TEST
+	depends on SPI_MASTER
+	select REGMAP_MMIO
+	help
+	  This enables support for SPI-NAND mode on the Airoha NAND
+	  Flash Interface found on Airoha ARM SoCs. This controller
+	  is implemented as a SPI-MEM controller.
+
 config SPI_ALTERA
 	tristate "Altera SPI Controller platform driver"
 	select SPI_ALTERA_CORE
diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile
index 4ff8d725ba5e..e694254dec04 100644
--- a/drivers/spi/Makefile
+++ b/drivers/spi/Makefile
@@ -14,6 +14,7 @@ obj-$(CONFIG_SPI_SPIDEV)		+= spidev.o
 obj-$(CONFIG_SPI_LOOPBACK_TEST)		+= spi-loopback-test.o
 
 # SPI master controller drivers (bus)
+obj-$(CONFIG_SPI_AIROHA_SNFI)		+= spi-airoha-snfi.o
 obj-$(CONFIG_SPI_ALTERA)		+= spi-altera-platform.o
 obj-$(CONFIG_SPI_ALTERA_CORE)		+= spi-altera-core.o
 obj-$(CONFIG_SPI_ALTERA_DFL)		+= spi-altera-dfl.o
diff --git a/drivers/spi/spi-airoha-snfi.c b/drivers/spi/spi-airoha-snfi.c
new file mode 100644
index 000000000000..9d97ec98881c
--- /dev/null
+++ b/drivers/spi/spi-airoha-snfi.c
@@ -0,0 +1,1129 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2024 AIROHA Inc
+ * Author: Lorenzo Bianconi <lorenzo@kernel.org>
+ * Author: Ray Liu <ray.liu@airoha.com>
+ */
+
+#include <linux/bitfield.h>
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/dma-mapping.h>
+#include <linux/errno.h>
+#include <linux/limits.h>
+#include <linux/math.h>
+#include <linux/minmax.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/platform_device.h>
+#include <linux/property.h>
+#include <linux/regmap.h>
+#include <linux/sizes.h>
+#include <linux/spi/spi.h>
+#include <linux/spi/spi-mem.h>
+#include <linux/types.h>
+#include <asm/unaligned.h>
+
+/* SPI */
+#define REG_SPI_CTRL_BASE			0x1FA10000
+
+#define REG_SPI_CTRL_READ_MODE			0x0000
+#define REG_SPI_CTRL_READ_IDLE_EN		0x0004
+#define REG_SPI_CTRL_SIDLY			0x0008
+#define REG_SPI_CTRL_CSHEXT			0x000c
+#define REG_SPI_CTRL_CSLEXT			0x0010
+
+#define REG_SPI_CTRL_MTX_MODE_TOG		0x0014
+#define SPI_CTRL_MTX_MODE_TOG			GENMASK(3, 0)
+
+#define REG_SPI_CTRL_RDCTL_FSM			0x0018
+#define SPI_CTRL_RDCTL_FSM			GENMASK(3, 0)
+
+#define REG_SPI_CTRL_MACMUX_SEL			0x001c
+
+#define REG_SPI_CTRL_MANUAL_EN			0x0020
+#define SPI_CTRL_MANUAL_EN			BIT(0)
+
+#define REG_SPI_CTRL_OPFIFO_EMPTY		0x0024
+#define SPI_CTRL_OPFIFO_EMPTY			BIT(0)
+
+#define REG_SPI_CTRL_OPFIFO_WDATA		0x0028
+#define SPI_CTRL_OPFIFO_LEN			GENMASK(8, 0)
+#define SPI_CTRL_OPFIFO_OP			GENMASK(13, 9)
+
+#define REG_SPI_CTRL_OPFIFO_FULL		0x002c
+#define SPI_CTRL_OPFIFO_FULL			BIT(0)
+
+#define REG_SPI_CTRL_OPFIFO_WR			0x0030
+#define SPI_CTRL_OPFIFO_WR			BIT(0)
+
+#define REG_SPI_CTRL_DFIFO_FULL			0x0034
+#define SPI_CTRL_DFIFO_FULL			BIT(0)
+
+#define REG_SPI_CTRL_DFIFO_WDATA		0x0038
+#define SPI_CTRL_DFIFO_WDATA			GENMASK(7, 0)
+
+#define REG_SPI_CTRL_DFIFO_EMPTY		0x003c
+#define SPI_CTRL_DFIFO_EMPTY			BIT(0)
+
+#define REG_SPI_CTRL_DFIFO_RD			0x0040
+#define SPI_CTRL_DFIFO_RD			BIT(0)
+
+#define REG_SPI_CTRL_DFIFO_RDATA		0x0044
+#define SPI_CTRL_DFIFO_RDATA			GENMASK(7, 0)
+
+#define REG_SPI_CTRL_DUMMY			0x0080
+#define SPI_CTRL_CTRL_DUMMY			GENMASK(3, 0)
+
+#define REG_SPI_CTRL_PROBE_SEL			0x0088
+#define REG_SPI_CTRL_INTERRUPT			0x0090
+#define REG_SPI_CTRL_INTERRUPT_EN		0x0094
+#define REG_SPI_CTRL_SI_CK_SEL			0x009c
+#define REG_SPI_CTRL_SW_CFGNANDADDR_VAL		0x010c
+#define REG_SPI_CTRL_SW_CFGNANDADDR_EN		0x0110
+#define REG_SPI_CTRL_SFC_STRAP			0x0114
+
+#define REG_SPI_CTRL_NFI2SPI_EN			0x0130
+#define SPI_CTRL_NFI2SPI_EN			BIT(0)
+
+/* NFI2SPI */
+#define REG_SPI_NFI_CNFG			0x0000
+#define SPI_NFI_DMA_MODE			BIT(0)
+#define SPI_NFI_READ_MODE			BIT(1)
+#define SPI_NFI_DMA_BURST_EN			BIT(2)
+#define SPI_NFI_HW_ECC_EN			BIT(8)
+#define SPI_NFI_AUTO_FDM_EN			BIT(9)
+#define SPI_NFI_OPMODE				GENMASK(14, 12)
+
+#define REG_SPI_NFI_PAGEFMT			0x0004
+#define SPI_NFI_PAGE_SIZE			GENMASK(1, 0)
+#define SPI_NFI_SPARE_SIZE			GENMASK(5, 4)
+
+#define REG_SPI_NFI_CON				0x0008
+#define SPI_NFI_FIFO_FLUSH			BIT(0)
+#define SPI_NFI_RST				BIT(1)
+#define SPI_NFI_RD_TRIG				BIT(8)
+#define SPI_NFI_WR_TRIG				BIT(9)
+#define SPI_NFI_SEC_NUM				GENMASK(15, 12)
+
+#define REG_SPI_NFI_INTR_EN			0x0010
+#define SPI_NFI_RD_DONE_EN			BIT(0)
+#define SPI_NFI_WR_DONE_EN			BIT(1)
+#define SPI_NFI_RST_DONE_EN			BIT(2)
+#define SPI_NFI_ERASE_DONE_EN			BIT(3)
+#define SPI_NFI_BUSY_RETURN_EN			BIT(4)
+#define SPI_NFI_ACCESS_LOCK_EN			BIT(5)
+#define SPI_NFI_AHB_DONE_EN			BIT(6)
+#define SPI_NFI_ALL_IRQ_EN					\
+	(SPI_NFI_RD_DONE_EN | SPI_NFI_WR_DONE_EN |		\
+	 SPI_NFI_RST_DONE_EN | SPI_NFI_ERASE_DONE_EN |		\
+	 SPI_NFI_BUSY_RETURN_EN | SPI_NFI_ACCESS_LOCK_EN |	\
+	 SPI_NFI_AHB_DONE_EN)
+
+#define REG_SPI_NFI_INTR			0x0014
+#define SPI_NFI_AHB_DONE			BIT(6)
+
+#define REG_SPI_NFI_CMD				0x0020
+
+#define REG_SPI_NFI_ADDR_NOB			0x0030
+#define SPI_NFI_ROW_ADDR_NOB			GENMASK(6, 4)
+
+#define REG_SPI_NFI_STA				0x0060
+#define REG_SPI_NFI_FIFOSTA			0x0064
+#define REG_SPI_NFI_STRADDR			0x0080
+#define REG_SPI_NFI_FDM0L			0x00a0
+#define REG_SPI_NFI_FDM0M			0x00a4
+#define REG_SPI_NFI_FDM7L			0x00d8
+#define REG_SPI_NFI_FDM7M			0x00dc
+#define REG_SPI_NFI_FIFODATA0			0x0190
+#define REG_SPI_NFI_FIFODATA1			0x0194
+#define REG_SPI_NFI_FIFODATA2			0x0198
+#define REG_SPI_NFI_FIFODATA3			0x019c
+#define REG_SPI_NFI_MASTERSTA			0x0224
+
+#define REG_SPI_NFI_SECCUS_SIZE			0x022c
+#define SPI_NFI_CUS_SEC_SIZE			GENMASK(12, 0)
+#define SPI_NFI_CUS_SEC_SIZE_EN			BIT(16)
+
+#define REG_SPI_NFI_RD_CTL2			0x0510
+#define REG_SPI_NFI_RD_CTL3			0x0514
+
+#define REG_SPI_NFI_PG_CTL1			0x0524
+#define SPI_NFI_PG_LOAD_CMD			GENMASK(15, 8)
+
+#define REG_SPI_NFI_PG_CTL2			0x0528
+#define REG_SPI_NFI_NOR_PROG_ADDR		0x052c
+#define REG_SPI_NFI_NOR_RD_ADDR			0x0534
+
+#define REG_SPI_NFI_SNF_MISC_CTL		0x0538
+#define SPI_NFI_DATA_READ_WR_MODE		GENMASK(18, 16)
+
+#define REG_SPI_NFI_SNF_MISC_CTL2		0x053c
+#define SPI_NFI_READ_DATA_BYTE_NUM		GENMASK(12, 0)
+#define SPI_NFI_PROG_LOAD_BYTE_NUM		GENMASK(28, 16)
+
+#define REG_SPI_NFI_SNF_STA_CTL1		0x0550
+#define SPI_NFI_READ_FROM_CACHE_DONE		BIT(25)
+#define SPI_NFI_LOAD_TO_CACHE_DONE		BIT(26)
+
+#define REG_SPI_NFI_SNF_STA_CTL2		0x0554
+
+#define REG_SPI_NFI_SNF_NFI_CNFG		0x055c
+#define SPI_NFI_SPI_MODE			BIT(0)
+
+/* SPI NAND Protocol OP */
+#define SPI_NAND_OP_GET_FEATURE			0x0f
+#define SPI_NAND_OP_SET_FEATURE			0x1f
+#define SPI_NAND_OP_PAGE_READ			0x13
+#define SPI_NAND_OP_READ_FROM_CACHE_SINGLE	0x03
+#define SPI_NAND_OP_READ_FROM_CACHE_SINGLE_FAST	0x0b
+#define SPI_NAND_OP_READ_FROM_CACHE_DUAL	0x3b
+#define SPI_NAND_OP_READ_FROM_CACHE_QUAD	0x6b
+#define SPI_NAND_OP_WRITE_ENABLE		0x06
+#define SPI_NAND_OP_WRITE_DISABLE		0x04
+#define SPI_NAND_OP_PROGRAM_LOAD_SINGLE		0x02
+#define SPI_NAND_OP_PROGRAM_LOAD_QUAD		0x32
+#define SPI_NAND_OP_PROGRAM_LOAD_RAMDOM_SINGLE	0x84
+#define SPI_NAND_OP_PROGRAM_LOAD_RAMDON_QUAD	0x34
+#define SPI_NAND_OP_PROGRAM_EXECUTE		0x10
+#define SPI_NAND_OP_READ_ID			0x9f
+#define SPI_NAND_OP_BLOCK_ERASE			0xd8
+#define SPI_NAND_OP_RESET			0xff
+#define SPI_NAND_OP_DIE_SELECT			0xc2
+
+#define SPI_NAND_CACHE_SIZE			(SZ_4K + SZ_256)
+#define SPI_MAX_TRANSFER_SIZE			511
+
+enum airoha_snand_mode {
+	SPI_MODE_AUTO,
+	SPI_MODE_MANUAL,
+	SPI_MODE_DMA,
+};
+
+enum airoha_snand_cs {
+	SPI_CHIP_SEL_HIGH,
+	SPI_CHIP_SEL_LOW,
+};
+
+struct airoha_snand_dev {
+	size_t buf_len;
+
+	u8 *txrx_buf;
+	dma_addr_t dma_addr;
+
+	u64 cur_page_num;
+	bool data_need_update;
+};
+
+struct airoha_snand_ctrl {
+	struct device *dev;
+	struct regmap *regmap_ctrl;
+	struct regmap *regmap_nfi;
+	struct clk *spi_clk;
+
+	struct {
+		size_t page_size;
+		size_t sec_size;
+		u8 sec_num;
+		u8 spare_size;
+	} nfi_cfg;
+};
+
+static int airoha_snand_set_fifo_op(struct airoha_snand_ctrl *as_ctrl,
+				    u8 op_cmd, int op_len)
+{
+	int err;
+	u32 val;
+
+	err = regmap_write(as_ctrl->regmap_ctrl, REG_SPI_CTRL_OPFIFO_WDATA,
+			   FIELD_PREP(SPI_CTRL_OPFIFO_LEN, op_len) |
+			   FIELD_PREP(SPI_CTRL_OPFIFO_OP, op_cmd));
+	if (err)
+		return err;
+
+	err = regmap_read_poll_timeout(as_ctrl->regmap_ctrl,
+				       REG_SPI_CTRL_OPFIFO_FULL,
+				       val, !(val & SPI_CTRL_OPFIFO_FULL),
+				       0, 250 * USEC_PER_MSEC);
+	if (err)
+		return err;
+
+	err = regmap_write(as_ctrl->regmap_ctrl, REG_SPI_CTRL_OPFIFO_WR,
+			   SPI_CTRL_OPFIFO_WR);
+	if (err)
+		return err;
+
+	return regmap_read_poll_timeout(as_ctrl->regmap_ctrl,
+					REG_SPI_CTRL_OPFIFO_EMPTY,
+					val, (val & SPI_CTRL_OPFIFO_EMPTY),
+					0, 250 * USEC_PER_MSEC);
+}
+
+static int airoha_snand_set_cs(struct airoha_snand_ctrl *as_ctrl, u8 cs)
+{
+	return airoha_snand_set_fifo_op(as_ctrl, cs, sizeof(cs));
+}
+
+static int airoha_snand_write_data_to_fifo(struct airoha_snand_ctrl *as_ctrl,
+					   const u8 *data, int len)
+{
+	int i;
+
+	for (i = 0; i < len; i++) {
+		int err;
+		u32 val;
+
+		/* 1. Wait until dfifo is not full */
+		err = regmap_read_poll_timeout(as_ctrl->regmap_ctrl,
+					       REG_SPI_CTRL_DFIFO_FULL, val,
+					       !(val & SPI_CTRL_DFIFO_FULL),
+					       0, 250 * USEC_PER_MSEC);
+		if (err)
+			return err;
+
+		/* 2. Write data to register DFIFO_WDATA */
+		err = regmap_write(as_ctrl->regmap_ctrl,
+				   REG_SPI_CTRL_DFIFO_WDATA,
+				   FIELD_PREP(SPI_CTRL_DFIFO_WDATA, data[i]));
+		if (err)
+			return err;
+
+		/* 3. Wait until dfifo is not full */
+		err = regmap_read_poll_timeout(as_ctrl->regmap_ctrl,
+					       REG_SPI_CTRL_DFIFO_FULL, val,
+					       !(val & SPI_CTRL_DFIFO_FULL),
+					       0, 250 * USEC_PER_MSEC);
+		if (err)
+			return err;
+	}
+
+	return 0;
+}
+
+static int airoha_snand_read_data_from_fifo(struct airoha_snand_ctrl *as_ctrl,
+					    u8 *ptr, int len)
+{
+	int i;
+
+	for (i = 0; i < len; i++) {
+		int err;
+		u32 val;
+
+		/* 1. wait until dfifo is not empty */
+		err = regmap_read_poll_timeout(as_ctrl->regmap_ctrl,
+					       REG_SPI_CTRL_DFIFO_EMPTY, val,
+					       !(val & SPI_CTRL_DFIFO_EMPTY),
+					       0, 250 * USEC_PER_MSEC);
+		if (err)
+			return err;
+
+		/* 2. read from dfifo to register DFIFO_RDATA */
+		err = regmap_read(as_ctrl->regmap_ctrl,
+				  REG_SPI_CTRL_DFIFO_RDATA, &val);
+		if (err)
+			return err;
+
+		ptr[i] = FIELD_GET(SPI_CTRL_DFIFO_RDATA, val);
+		/* 3. enable register DFIFO_RD to read next byte */
+		err = regmap_write(as_ctrl->regmap_ctrl,
+				   REG_SPI_CTRL_DFIFO_RD, SPI_CTRL_DFIFO_RD);
+		if (err)
+			return err;
+	}
+
+	return 0;
+}
+
+static int airoha_snand_set_mode(struct airoha_snand_ctrl *as_ctrl,
+				 enum airoha_snand_mode mode)
+{
+	int err;
+
+	switch (mode) {
+	case SPI_MODE_MANUAL: {
+		u32 val;
+
+		err = regmap_write(as_ctrl->regmap_ctrl,
+				   REG_SPI_CTRL_NFI2SPI_EN, 0);
+		if (err)
+			return err;
+
+		err = regmap_write(as_ctrl->regmap_ctrl,
+				   REG_SPI_CTRL_READ_IDLE_EN, 0);
+		if (err)
+			return err;
+
+		err = regmap_read_poll_timeout(as_ctrl->regmap_ctrl,
+					       REG_SPI_CTRL_RDCTL_FSM, val,
+					       !(val & SPI_CTRL_RDCTL_FSM),
+					       0, 250 * USEC_PER_MSEC);
+		if (err)
+			return err;
+
+		err = regmap_write(as_ctrl->regmap_ctrl,
+				   REG_SPI_CTRL_MTX_MODE_TOG, 9);
+		if (err)
+			return err;
+
+		err = regmap_write(as_ctrl->regmap_ctrl,
+				   REG_SPI_CTRL_MANUAL_EN, SPI_CTRL_MANUAL_EN);
+		if (err)
+			return err;
+		break;
+	}
+	case SPI_MODE_DMA:
+		err = regmap_write(as_ctrl->regmap_ctrl,
+				   REG_SPI_CTRL_NFI2SPI_EN,
+				   SPI_CTRL_MANUAL_EN);
+		if (err < 0)
+			return err;
+
+		err = regmap_write(as_ctrl->regmap_ctrl,
+				   REG_SPI_CTRL_MTX_MODE_TOG, 0x0);
+		if (err < 0)
+			return err;
+
+		err = regmap_write(as_ctrl->regmap_ctrl,
+				   REG_SPI_CTRL_MANUAL_EN, 0x0);
+		if (err < 0)
+			return err;
+		break;
+	case SPI_MODE_AUTO:
+	default:
+		break;
+	}
+
+	return regmap_write(as_ctrl->regmap_ctrl, REG_SPI_CTRL_DUMMY, 0);
+}
+
+static int airoha_snand_write_data(struct airoha_snand_ctrl *as_ctrl, u8 cmd,
+				   const u8 *data, int len)
+{
+	int i, data_len;
+
+	for (i = 0; i < len; i += data_len) {
+		int err;
+
+		data_len = min(len, SPI_MAX_TRANSFER_SIZE);
+		err = airoha_snand_set_fifo_op(as_ctrl, cmd, data_len);
+		if (err)
+			return err;
+
+		err = airoha_snand_write_data_to_fifo(as_ctrl, &data[i],
+						      data_len);
+		if (err < 0)
+			return err;
+	}
+
+	return 0;
+}
+
+static int airoha_snand_read_data(struct airoha_snand_ctrl *as_ctrl, u8 *data,
+				  int len)
+{
+	int i, data_len;
+
+	for (i = 0; i < len; i += data_len) {
+		int err;
+
+		data_len = min(len, SPI_MAX_TRANSFER_SIZE);
+		err = airoha_snand_set_fifo_op(as_ctrl, 0xc, data_len);
+		if (err)
+			return err;
+
+		err = airoha_snand_read_data_from_fifo(as_ctrl, &data[i],
+						       data_len);
+		if (err < 0)
+			return err;
+	}
+
+	return 0;
+}
+
+static int airoha_snand_nfi_init(struct airoha_snand_ctrl *as_ctrl)
+{
+	int err;
+
+	/* switch to SNFI mode */
+	err = regmap_write(as_ctrl->regmap_nfi, REG_SPI_NFI_SNF_NFI_CNFG,
+			   SPI_NFI_SPI_MODE);
+	if (err)
+		return err;
+
+	/* Enable DMA */
+	return regmap_update_bits(as_ctrl->regmap_nfi, REG_SPI_NFI_INTR_EN,
+				  SPI_NFI_ALL_IRQ_EN, SPI_NFI_AHB_DONE_EN);
+}
+
+static int airoha_snand_nfi_config(struct airoha_snand_ctrl *as_ctrl)
+{
+	int err;
+	u32 val;
+
+	err = regmap_write(as_ctrl->regmap_nfi, REG_SPI_NFI_CON,
+			   SPI_NFI_FIFO_FLUSH | SPI_NFI_RST);
+	if (err)
+		return err;
+
+	/* auto FDM */
+	err = regmap_clear_bits(as_ctrl->regmap_nfi, REG_SPI_NFI_CNFG,
+				SPI_NFI_AUTO_FDM_EN);
+	if (err)
+		return err;
+
+	/* HW ECC */
+	err = regmap_clear_bits(as_ctrl->regmap_nfi, REG_SPI_NFI_CNFG,
+				SPI_NFI_HW_ECC_EN);
+	if (err)
+		return err;
+
+	/* DMA Burst */
+	err = regmap_set_bits(as_ctrl->regmap_nfi, REG_SPI_NFI_CNFG,
+			      SPI_NFI_DMA_BURST_EN);
+	if (err)
+		return err;
+
+	/* page format */
+	switch (as_ctrl->nfi_cfg.spare_size) {
+	case 26:
+		val = FIELD_PREP(SPI_NFI_SPARE_SIZE, 0x1);
+		break;
+	case 27:
+		val = FIELD_PREP(SPI_NFI_SPARE_SIZE, 0x2);
+		break;
+	case 28:
+		val = FIELD_PREP(SPI_NFI_SPARE_SIZE, 0x3);
+		break;
+	default:
+		val = FIELD_PREP(SPI_NFI_SPARE_SIZE, 0x0);
+		break;
+	}
+
+	err = regmap_update_bits(as_ctrl->regmap_nfi, REG_SPI_NFI_PAGEFMT,
+				 SPI_NFI_SPARE_SIZE, val);
+	if (err)
+		return err;
+
+	switch (as_ctrl->nfi_cfg.page_size) {
+	case 2048:
+		val = FIELD_PREP(SPI_NFI_PAGE_SIZE, 0x1);
+		break;
+	case 4096:
+		val = FIELD_PREP(SPI_NFI_PAGE_SIZE, 0x2);
+		break;
+	default:
+		val = FIELD_PREP(SPI_NFI_PAGE_SIZE, 0x0);
+		break;
+	}
+
+	err = regmap_update_bits(as_ctrl->regmap_nfi, REG_SPI_NFI_PAGEFMT,
+				 SPI_NFI_PAGE_SIZE, val);
+	if (err)
+		return err;
+
+	/* sec num */
+	val = FIELD_PREP(SPI_NFI_SEC_NUM, as_ctrl->nfi_cfg.sec_num);
+	err = regmap_update_bits(as_ctrl->regmap_nfi, REG_SPI_NFI_CON,
+				 SPI_NFI_SEC_NUM, val);
+	if (err)
+		return err;
+
+	/* enable cust sec size */
+	err = regmap_set_bits(as_ctrl->regmap_nfi, REG_SPI_NFI_SECCUS_SIZE,
+			      SPI_NFI_CUS_SEC_SIZE_EN);
+	if (err)
+		return err;
+
+	/* set cust sec size */
+	val = FIELD_PREP(SPI_NFI_CUS_SEC_SIZE, as_ctrl->nfi_cfg.sec_size);
+	return regmap_update_bits(as_ctrl->regmap_nfi,
+				  REG_SPI_NFI_SECCUS_SIZE,
+				  SPI_NFI_CUS_SEC_SIZE, val);
+}
+
+static bool airoha_snand_is_page_ops(const struct spi_mem_op *op)
+{
+	if (op->addr.nbytes != 2)
+		return false;
+
+	if (op->addr.buswidth != 1 && op->addr.buswidth != 2 &&
+	    op->addr.buswidth != 4)
+		return false;
+
+	switch (op->data.dir) {
+	case SPI_MEM_DATA_IN:
+		if (op->dummy.nbytes * BITS_PER_BYTE / op->dummy.buswidth > 0xf)
+			return false;
+
+		/* quad in / quad out */
+		if (op->addr.buswidth == 4)
+			return op->data.buswidth == 4;
+
+		if (op->addr.buswidth == 2)
+			return op->data.buswidth == 2;
+
+		/* standard spi */
+		return op->data.buswidth == 4 || op->data.buswidth == 2 ||
+		       op->data.buswidth == 1;
+	case SPI_MEM_DATA_OUT:
+		return !op->dummy.nbytes && op->addr.buswidth == 1 &&
+		       (op->data.buswidth == 4 || op->data.buswidth == 1);
+	default:
+		return false;
+	}
+}
+
+static int airoha_snand_adjust_op_size(struct spi_mem *mem,
+				       struct spi_mem_op *op)
+{
+	size_t max_len;
+
+	if (airoha_snand_is_page_ops(op)) {
+		struct airoha_snand_ctrl *as_ctrl;
+
+		as_ctrl = spi_controller_get_devdata(mem->spi->controller);
+		max_len = as_ctrl->nfi_cfg.sec_size;
+		max_len += as_ctrl->nfi_cfg.spare_size;
+		max_len *= as_ctrl->nfi_cfg.sec_num;
+
+		if (op->data.nbytes > max_len)
+			op->data.nbytes = max_len;
+	} else {
+		max_len = 1 + op->addr.nbytes + op->dummy.nbytes;
+		if (max_len >= 160)
+			return -EOPNOTSUPP;
+
+		if (op->data.nbytes > 160 - max_len)
+			op->data.nbytes = 160 - max_len;
+	}
+
+	return 0;
+}
+
+static bool airoha_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.buswidth != 1)
+		return false;
+
+	if (airoha_snand_is_page_ops(op))
+		return true;
+
+	return (!op->addr.nbytes || op->addr.buswidth == 1) &&
+	       (!op->dummy.nbytes || op->dummy.buswidth == 1) &&
+	       (!op->data.nbytes || op->data.buswidth == 1);
+}
+
+static int airoha_snand_dirmap_create(struct spi_mem_dirmap_desc *desc)
+{
+	struct airoha_snand_dev *as_dev = spi_get_ctldata(desc->mem->spi);
+
+	if (!as_dev->txrx_buf)
+		return -EINVAL;
+
+	if (desc->info.offset + desc->info.length > U32_MAX)
+		return -EINVAL;
+
+	if (!airoha_snand_supports_op(desc->mem, &desc->info.op_tmpl))
+		return -EOPNOTSUPP;
+
+	return 0;
+}
+
+static ssize_t airoha_snand_dirmap_read(struct spi_mem_dirmap_desc *desc,
+					u64 offs, size_t len, void *buf)
+{
+	struct spi_device *spi = desc->mem->spi;
+	struct airoha_snand_dev *as_dev = spi_get_ctldata(spi);
+	struct spi_mem_op *op = &desc->info.op_tmpl;
+	struct airoha_snand_ctrl *as_ctrl;
+	u32 val, rd_mode;
+	int err;
+
+	if (!as_dev->data_need_update)
+		return len;
+
+	as_dev->data_need_update = false;
+
+	switch (op->cmd.opcode) {
+	case SPI_NAND_OP_READ_FROM_CACHE_DUAL:
+		rd_mode = 1;
+		break;
+	case SPI_NAND_OP_READ_FROM_CACHE_QUAD:
+		rd_mode = 2;
+		break;
+	default:
+		rd_mode = 0;
+		break;
+	}
+
+	as_ctrl = spi_controller_get_devdata(spi->controller);
+	err = airoha_snand_set_mode(as_ctrl, SPI_MODE_DMA);
+	if (err < 0)
+		return err;
+
+	err = airoha_snand_nfi_config(as_ctrl);
+	if (err)
+		return err;
+
+	dma_sync_single_for_device(as_ctrl->dev, as_dev->dma_addr,
+				   as_dev->buf_len, DMA_BIDIRECTIONAL);
+
+	/* set dma addr */
+	err = regmap_write(as_ctrl->regmap_nfi, REG_SPI_NFI_STRADDR,
+			   as_dev->dma_addr);
+	if (err)
+		return err;
+
+	/* set cust sec size */
+	val = as_ctrl->nfi_cfg.sec_size * as_ctrl->nfi_cfg.sec_num;
+	val = FIELD_PREP(SPI_NFI_READ_DATA_BYTE_NUM, val);
+	err = regmap_update_bits(as_ctrl->regmap_nfi,
+				 REG_SPI_NFI_SNF_MISC_CTL2,
+				 SPI_NFI_READ_DATA_BYTE_NUM, val);
+	if (err)
+		return err;
+
+	/* set read command */
+	err = regmap_write(as_ctrl->regmap_nfi, REG_SPI_NFI_RD_CTL2,
+			   op->cmd.opcode);
+	if (err)
+		return err;
+
+	/* set read mode */
+	err = regmap_write(as_ctrl->regmap_nfi, REG_SPI_NFI_SNF_MISC_CTL,
+			   FIELD_PREP(SPI_NFI_DATA_READ_WR_MODE, rd_mode));
+	if (err)
+		return err;
+
+	/* set read addr */
+	err = regmap_write(as_ctrl->regmap_nfi, REG_SPI_NFI_RD_CTL3, 0x0);
+	if (err)
+		return err;
+
+	/* set nfi read */
+	err = regmap_update_bits(as_ctrl->regmap_nfi, REG_SPI_NFI_CNFG,
+				 SPI_NFI_OPMODE,
+				 FIELD_PREP(SPI_NFI_OPMODE, 6));
+	if (err)
+		return err;
+
+	err = regmap_set_bits(as_ctrl->regmap_nfi, REG_SPI_NFI_CNFG,
+			      SPI_NFI_READ_MODE | SPI_NFI_DMA_MODE);
+	if (err)
+		return err;
+
+	err = regmap_write(as_ctrl->regmap_nfi, REG_SPI_NFI_CMD, 0x0);
+	if (err)
+		return err;
+
+	/* trigger dma start read */
+	err = regmap_clear_bits(as_ctrl->regmap_nfi, REG_SPI_NFI_CON,
+				SPI_NFI_RD_TRIG);
+	if (err)
+		return err;
+
+	err = regmap_set_bits(as_ctrl->regmap_nfi, REG_SPI_NFI_CON,
+			      SPI_NFI_RD_TRIG);
+	if (err)
+		return err;
+
+	err = regmap_read_poll_timeout(as_ctrl->regmap_nfi,
+				       REG_SPI_NFI_SNF_STA_CTL1, val,
+				       (val & SPI_NFI_READ_FROM_CACHE_DONE),
+				       0, 1 * USEC_PER_SEC);
+	if (err)
+		return err;
+
+	err = regmap_set_bits(as_ctrl->regmap_nfi, REG_SPI_NFI_SNF_STA_CTL1,
+			      SPI_NFI_READ_FROM_CACHE_DONE);
+	if (err)
+		return err;
+
+	err = regmap_read_poll_timeout(as_ctrl->regmap_nfi, REG_SPI_NFI_INTR,
+				       val, (val & SPI_NFI_AHB_DONE), 0,
+				       1 * USEC_PER_SEC);
+	if (err)
+		return err;
+
+	/* DMA read need delay for data ready from controller to DRAM */
+	udelay(1);
+
+	dma_sync_single_for_cpu(as_ctrl->dev, as_dev->dma_addr,
+				as_dev->buf_len, DMA_BIDIRECTIONAL);
+	err = airoha_snand_set_mode(as_ctrl, SPI_MODE_MANUAL);
+	if (err < 0)
+		return err;
+
+	memcpy(buf, as_dev->txrx_buf + offs, len);
+
+	return len;
+}
+
+static ssize_t airoha_snand_dirmap_write(struct spi_mem_dirmap_desc *desc,
+					 u64 offs, size_t len, const void *buf)
+{
+	struct spi_device *spi = desc->mem->spi;
+	struct airoha_snand_dev *as_dev = spi_get_ctldata(spi);
+	struct spi_mem_op *op = &desc->info.op_tmpl;
+	struct airoha_snand_ctrl *as_ctrl;
+	u32 wr_mode, val;
+	int err;
+
+	as_ctrl = spi_controller_get_devdata(spi->controller);
+	err = airoha_snand_set_mode(as_ctrl, SPI_MODE_MANUAL);
+	if (err < 0)
+		return err;
+
+	dma_sync_single_for_cpu(as_ctrl->dev, as_dev->dma_addr,
+				as_dev->buf_len, DMA_BIDIRECTIONAL);
+	memcpy(as_dev->txrx_buf + offs, buf, len);
+	dma_sync_single_for_device(as_ctrl->dev, as_dev->dma_addr,
+				   as_dev->buf_len, DMA_BIDIRECTIONAL);
+
+	err = airoha_snand_set_mode(as_ctrl, SPI_MODE_DMA);
+	if (err < 0)
+		return err;
+
+	err = airoha_snand_nfi_config(as_ctrl);
+	if (err)
+		return err;
+
+	if (op->cmd.opcode == SPI_NAND_OP_PROGRAM_LOAD_QUAD ||
+	    op->cmd.opcode == SPI_NAND_OP_PROGRAM_LOAD_RAMDON_QUAD)
+		wr_mode = BIT(1);
+	else
+		wr_mode = 0;
+
+	err = regmap_write(as_ctrl->regmap_nfi, REG_SPI_NFI_STRADDR,
+			   as_dev->dma_addr);
+	if (err)
+		return err;
+
+	val = FIELD_PREP(SPI_NFI_PROG_LOAD_BYTE_NUM,
+			 as_ctrl->nfi_cfg.sec_size * as_ctrl->nfi_cfg.sec_num);
+	err = regmap_update_bits(as_ctrl->regmap_nfi,
+				 REG_SPI_NFI_SNF_MISC_CTL2,
+				 SPI_NFI_PROG_LOAD_BYTE_NUM, val);
+	if (err)
+		return err;
+
+	err = regmap_write(as_ctrl->regmap_nfi, REG_SPI_NFI_PG_CTL1,
+			   FIELD_PREP(SPI_NFI_PG_LOAD_CMD,
+				      op->cmd.opcode));
+	if (err)
+		return err;
+
+	err = regmap_write(as_ctrl->regmap_nfi, REG_SPI_NFI_SNF_MISC_CTL,
+			   FIELD_PREP(SPI_NFI_DATA_READ_WR_MODE, wr_mode));
+	if (err)
+		return err;
+
+	err = regmap_write(as_ctrl->regmap_nfi, REG_SPI_NFI_PG_CTL2, 0x0);
+	if (err)
+		return err;
+
+	err = regmap_clear_bits(as_ctrl->regmap_nfi, REG_SPI_NFI_CNFG,
+				SPI_NFI_READ_MODE);
+	if (err)
+		return err;
+
+	err = regmap_update_bits(as_ctrl->regmap_nfi, REG_SPI_NFI_CNFG,
+				 SPI_NFI_OPMODE,
+				 FIELD_PREP(SPI_NFI_OPMODE, 3));
+	if (err)
+		return err;
+
+	err = regmap_set_bits(as_ctrl->regmap_nfi, REG_SPI_NFI_CNFG,
+			      SPI_NFI_DMA_MODE);
+	if (err)
+		return err;
+
+	err = regmap_write(as_ctrl->regmap_nfi, REG_SPI_NFI_CMD, 0x80);
+	if (err)
+		return err;
+
+	err = regmap_clear_bits(as_ctrl->regmap_nfi, REG_SPI_NFI_CON,
+				SPI_NFI_WR_TRIG);
+	if (err)
+		return err;
+
+	err = regmap_set_bits(as_ctrl->regmap_nfi, REG_SPI_NFI_CON,
+			      SPI_NFI_WR_TRIG);
+	if (err)
+		return err;
+
+	err = regmap_read_poll_timeout(as_ctrl->regmap_nfi, REG_SPI_NFI_INTR,
+				       val, (val & SPI_NFI_AHB_DONE), 0,
+				       1 * USEC_PER_SEC);
+	if (err)
+		return err;
+
+	err = regmap_read_poll_timeout(as_ctrl->regmap_nfi,
+				       REG_SPI_NFI_SNF_STA_CTL1, val,
+				       (val & SPI_NFI_LOAD_TO_CACHE_DONE),
+				       0, 1 * USEC_PER_SEC);
+	if (err)
+		return err;
+
+	err = regmap_set_bits(as_ctrl->regmap_nfi, REG_SPI_NFI_SNF_STA_CTL1,
+			      SPI_NFI_LOAD_TO_CACHE_DONE);
+	if (err)
+		return err;
+
+	err = airoha_snand_set_mode(as_ctrl, SPI_MODE_MANUAL);
+	if (err < 0)
+		return err;
+
+	return len;
+}
+
+static int airoha_snand_exec_op(struct spi_mem *mem,
+				const struct spi_mem_op *op)
+{
+	struct airoha_snand_dev *as_dev = spi_get_ctldata(mem->spi);
+	u8 data[8], cmd, opcode = op->cmd.opcode;
+	struct airoha_snand_ctrl *as_ctrl;
+	int i, err;
+
+	as_ctrl = spi_controller_get_devdata(mem->spi->controller);
+	if (opcode == SPI_NAND_OP_PROGRAM_EXECUTE &&
+	    op->addr.val == as_dev->cur_page_num) {
+		as_dev->data_need_update = true;
+	} else if (opcode == SPI_NAND_OP_PAGE_READ) {
+		if (!as_dev->data_need_update &&
+		    op->addr.val == as_dev->cur_page_num)
+			return 0;
+
+		as_dev->data_need_update = true;
+		as_dev->cur_page_num = op->addr.val;
+	}
+
+	/* switch to manual mode */
+	err = airoha_snand_set_mode(as_ctrl, SPI_MODE_MANUAL);
+	if (err < 0)
+		return err;
+
+	err = airoha_snand_set_cs(as_ctrl, SPI_CHIP_SEL_LOW);
+	if (err < 0)
+		return err;
+
+	/* opcode */
+	err = airoha_snand_write_data(as_ctrl, 0x8, &opcode, sizeof(opcode));
+	if (err)
+		return err;
+
+	/* addr part */
+	cmd = opcode == SPI_NAND_OP_GET_FEATURE ? 0x11 : 0x8;
+	put_unaligned_be64(op->addr.val, data);
+
+	for (i = ARRAY_SIZE(data) - op->addr.nbytes;
+	     i < ARRAY_SIZE(data); i++) {
+		err = airoha_snand_write_data(as_ctrl, cmd, &data[i],
+					      sizeof(data[0]));
+		if (err)
+			return err;
+	}
+
+	/* dummy */
+	data[0] = 0xff;
+	for (i = 0; i < op->dummy.nbytes; i++) {
+		err = airoha_snand_write_data(as_ctrl, 0x8, &data[0],
+					      sizeof(data[0]));
+		if (err)
+			return err;
+	}
+
+	/* data */
+	if (op->data.dir == SPI_MEM_DATA_IN) {
+		err = airoha_snand_read_data(as_ctrl, op->data.buf.in,
+					     op->data.nbytes);
+		if (err)
+			return err;
+	} else {
+		err = airoha_snand_write_data(as_ctrl, 0x8, op->data.buf.out,
+					      op->data.nbytes);
+		if (err)
+			return err;
+	}
+
+	return airoha_snand_set_cs(as_ctrl, SPI_CHIP_SEL_HIGH);
+}
+
+static const struct spi_controller_mem_ops airoha_snand_mem_ops = {
+	.adjust_op_size = airoha_snand_adjust_op_size,
+	.supports_op = airoha_snand_supports_op,
+	.exec_op = airoha_snand_exec_op,
+	.dirmap_create = airoha_snand_dirmap_create,
+	.dirmap_read = airoha_snand_dirmap_read,
+	.dirmap_write = airoha_snand_dirmap_write,
+};
+
+static int airoha_snand_setup(struct spi_device *spi)
+{
+	struct airoha_snand_ctrl *as_ctrl;
+	struct airoha_snand_dev *as_dev;
+
+	as_ctrl = spi_controller_get_devdata(spi->controller);
+
+	as_dev = devm_kzalloc(as_ctrl->dev, sizeof(*as_dev), GFP_KERNEL);
+	if (!as_dev)
+		return -ENOMEM;
+
+	/* prepare device buffer */
+	as_dev->buf_len = SPI_NAND_CACHE_SIZE;
+	as_dev->txrx_buf = devm_kzalloc(as_ctrl->dev, as_dev->buf_len,
+					GFP_KERNEL);
+	if (!as_dev->txrx_buf)
+		return -ENOMEM;
+
+	as_dev->dma_addr = dma_map_single(as_ctrl->dev, as_dev->txrx_buf,
+					  as_dev->buf_len, DMA_BIDIRECTIONAL);
+	if (dma_mapping_error(as_ctrl->dev, as_dev->dma_addr))
+		return -ENOMEM;
+
+	as_dev->data_need_update = true;
+	spi_set_ctldata(spi, as_dev);
+
+	return 0;
+}
+
+static void airoha_snand_cleanup(struct spi_device *spi)
+{
+	struct airoha_snand_dev *as_dev = spi_get_ctldata(spi);
+	struct airoha_snand_ctrl *as_ctrl;
+
+	as_ctrl = spi_controller_get_devdata(spi->controller);
+	dma_unmap_single(as_ctrl->dev, as_dev->dma_addr,
+			 as_dev->buf_len, DMA_BIDIRECTIONAL);
+	spi_set_ctldata(spi, NULL);
+}
+
+static int airoha_snand_nfi_setup(struct airoha_snand_ctrl *as_ctrl)
+{
+	u32 val, sec_size, sec_num;
+	int err;
+
+	err = regmap_read(as_ctrl->regmap_nfi, REG_SPI_NFI_CON, &val);
+	if (err)
+		return err;
+
+	sec_num = FIELD_GET(SPI_NFI_SEC_NUM, val);
+
+	err = regmap_read(as_ctrl->regmap_nfi, REG_SPI_NFI_SECCUS_SIZE, &val);
+	if (err)
+		return err;
+
+	sec_size = FIELD_GET(SPI_NFI_CUS_SEC_SIZE, val);
+
+	/* init default value */
+	as_ctrl->nfi_cfg.sec_size = sec_size;
+	as_ctrl->nfi_cfg.sec_num = sec_num;
+	as_ctrl->nfi_cfg.page_size = round_down(sec_size * sec_num, 1024);
+	as_ctrl->nfi_cfg.spare_size = 16;
+
+	err = airoha_snand_nfi_init(as_ctrl);
+	if (err)
+		return err;
+
+	return airoha_snand_nfi_config(as_ctrl);
+}
+
+static const struct regmap_config spi_ctrl_regmap_config = {
+	.name		= "ctrl",
+	.reg_bits	= 32,
+	.val_bits	= 32,
+	.reg_stride	= 4,
+	.max_register	= REG_SPI_CTRL_NFI2SPI_EN,
+};
+
+static const struct regmap_config spi_nfi_regmap_config = {
+	.name		= "nfi",
+	.reg_bits	= 32,
+	.val_bits	= 32,
+	.reg_stride	= 4,
+	.max_register	= REG_SPI_NFI_SNF_NFI_CNFG,
+};
+
+static const struct of_device_id airoha_snand_ids[] = {
+	{ .compatible	= "airoha,en7581-snand" },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, airoha_snand_ids);
+
+static int airoha_snand_probe(struct platform_device *pdev)
+{
+	struct airoha_snand_ctrl *as_ctrl;
+	struct device *dev = &pdev->dev;
+	struct spi_controller *ctrl;
+	void __iomem *base;
+	int err;
+
+	ctrl = devm_spi_alloc_host(dev, sizeof(*as_ctrl));
+	if (!ctrl)
+		return -ENOMEM;
+
+	as_ctrl = spi_controller_get_devdata(ctrl);
+	as_ctrl->dev = dev;
+
+	base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(base))
+		return PTR_ERR(base);
+
+	as_ctrl->regmap_ctrl = devm_regmap_init_mmio(dev, base,
+						     &spi_ctrl_regmap_config);
+	if (IS_ERR(as_ctrl->regmap_ctrl))
+		return dev_err_probe(dev, PTR_ERR(as_ctrl->regmap_ctrl),
+				     "failed to init spi ctrl regmap\n");
+
+	base = devm_platform_ioremap_resource(pdev, 1);
+	if (IS_ERR(base))
+		return PTR_ERR(base);
+
+	as_ctrl->regmap_nfi = devm_regmap_init_mmio(dev, base,
+						    &spi_nfi_regmap_config);
+	if (IS_ERR(as_ctrl->regmap_nfi))
+		return dev_err_probe(dev, PTR_ERR(as_ctrl->regmap_nfi),
+				     "failed to init spi nfi regmap\n");
+
+	as_ctrl->spi_clk = devm_clk_get_enabled(dev, "spi");
+	if (IS_ERR(as_ctrl->spi_clk))
+		return dev_err_probe(dev, PTR_ERR(as_ctrl->spi_clk),
+				     "unable to get spi clk\n");
+
+	err = dma_set_mask(as_ctrl->dev, DMA_BIT_MASK(32));
+	if (err)
+		return err;
+
+	ctrl->num_chipselect = 2;
+	ctrl->mem_ops = &airoha_snand_mem_ops;
+	ctrl->bits_per_word_mask = SPI_BPW_MASK(8);
+	ctrl->mode_bits = SPI_RX_DUAL;
+	ctrl->setup = airoha_snand_setup;
+	ctrl->cleanup = airoha_snand_cleanup;
+	device_set_node(&ctrl->dev, dev_fwnode(dev));
+
+	err = airoha_snand_nfi_setup(as_ctrl);
+	if (err)
+		return err;
+
+	return devm_spi_register_controller(dev, ctrl);
+}
+
+static struct platform_driver airoha_snand_driver = {
+	.driver = {
+		.name = "airoha-spi",
+		.of_match_table = airoha_snand_ids,
+	},
+	.probe = airoha_snand_probe,
+};
+module_platform_driver(airoha_snand_driver);
+
+MODULE_DESCRIPTION("Airoha SPI-NAND Flash Controller Driver");
+MODULE_AUTHOR("Lorenzo Bianconi <lorenzo@kernel.org>");
+MODULE_AUTHOR("Ray Liu <ray.liu@airoha.com>");
+MODULE_LICENSE("GPL");