[PATCH v4 0/3] Add add SPI-NAND Flash controller driver for EN7581

[PATCH v4 0/3] Add add SPI-NAND Flash controller driver for EN7581

[Lorenzo Bianconi]

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

Changes since v3:
- rely on devm_kzalloc() to allocate airoha_snand_dev buffers
- rely on dev_err_probe()
- cosmetic rework
Changes since v2:
- Fix compilation warnings
- Remove interrupt entry in dts since it is not connected so far
Changes since v1:
- Introduce spi clock dependency

Lorenzo Bianconi (3):
  dt-bindings: spi: airoha: Add YAML schema for SNFI controller
  arm64: dts: airoha: add EN7581 spi-nand node
  spi: airoha: add SPI-NAND Flash controller driver

 .../bindings/spi/airoha,en7581-snand.yaml     |   65 +
 MAINTAINERS                                   |    9 +
 arch/arm64/boot/dts/airoha/en7581.dtsi        |   19 +
 drivers/spi/Kconfig                           |   10 +
 drivers/spi/Makefile                          |    1 +
 drivers/spi/spi-airoha-snfi.c                 | 1140 +++++++++++++++++
 6 files changed, 1244 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/spi/airoha,en7581-snand.yaml
 create mode 100644 drivers/spi/spi-airoha-snfi.c

-- 
2.44.0

[PATCH v4 1/3] dt-bindings: spi: airoha: Add YAML schema for SNFI controller

[Lorenzo Bianconi]

Introduce Airoha EN7581 SPI NAND controller binding

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Tested-by: Rajeev Kumar <Rajeev.Kumar@airoha.com>
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
---
 .../bindings/spi/airoha,en7581-snand.yaml     | 65 +++++++++++++++++++
 1 file changed, 65 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/spi/airoha,en7581-snand.yaml

diff --git a/Documentation/devicetree/bindings/spi/airoha,en7581-snand.yaml b/Documentation/devicetree/bindings/spi/airoha,en7581-snand.yaml
new file mode 100644
index 000000000000..b820c5613dcc
--- /dev/null
+++ b/Documentation/devicetree/bindings/spi/airoha,en7581-snand.yaml
@@ -0,0 +1,65 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/spi/airoha,en7581-snand.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: SPI-NAND flash controller for Airoha ARM SoCs
+
+maintainers:
+  - Lorenzo Bianconi <lorenzo@kernel.org>
+
+allOf:
+  - $ref: spi-controller.yaml#
+
+properties:
+  compatible:
+    const: airoha,en7581-snand
+
+  reg:
+    items:
+      - description: spi base address
+      - description: nfi2spi base address
+
+  clocks:
+    maxItems: 1
+
+  clock-names:
+    items:
+      - const: spi
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - clock-names
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/en7523-clk.h>
+
+    soc {
+      #address-cells = <2>;
+      #size-cells = <2>;
+
+      spi@1fa10000 {
+        compatible = "airoha,en7581-snand";
+        reg = <0x0 0x1fa10000 0x0 0x140>,
+              <0x0 0x1fa11000 0x0 0x160>;
+
+        clocks = <&scuclk EN7523_CLK_SPI>;
+        clock-names = "spi";
+
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        flash@0 {
+          compatible = "spi-nand";
+          reg = <0>;
+          spi-tx-bus-width = <1>;
+          spi-rx-bus-width = <2>;
+        };
+      };
+    };
-- 
2.44.0

[PATCH v4 2/3] arm64: dts: airoha: add EN7581 spi-nand node

[Lorenzo Bianconi]

Introduce the Airoha EN7581 spi-nand node in Airoha EN7581 dtsi

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Tested-by: Rajeev Kumar <Rajeev.Kumar@airoha.com>
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
---
 arch/arm64/boot/dts/airoha/en7581.dtsi | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/arch/arm64/boot/dts/airoha/en7581.dtsi b/arch/arm64/boot/dts/airoha/en7581.dtsi
index 5c4bfe3e1e5a..98c2a86086e1 100644
--- a/arch/arm64/boot/dts/airoha/en7581.dtsi
+++ b/arch/arm64/boot/dts/airoha/en7581.dtsi
@@ -159,5 +159,24 @@ scuclk: clock-controller@1fa20000 {
 			      <0x0 0x1fbe3400 0x0 0xfc>;
 			#clock-cells = <1>;
 		};
+
+		snfi: spi@1fa10000 {
+			compatible = "airoha,en7581-snand";
+			reg = <0x0 0x1fa10000 0x0 0x140>,
+			      <0x0 0x1fa11000 0x0 0x160>;
+
+			clocks = <&scuclk EN7523_CLK_SPI>;
+			clock-names = "spi";
+
+			#address-cells = <1>;
+			#size-cells = <0>;
+			spi_nand: nand@0 {
+				compatible = "spi-nand";
+				reg = <0>;
+				spi-max-frequency = <50000000>;
+				spi-tx-bus-width = <1>;
+				spi-rx-bus-width = <2>;
+			};
+		};
 	};
 };
-- 
2.44.0

[PATCH v4 3/3] spi: airoha: add SPI-NAND Flash controller driver

[Lorenzo Bianconi]

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

Tested-by: Rajeev Kumar <Rajeev.Kumar@airoha.com>
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
---
 MAINTAINERS                   |    9 +
 drivers/spi/Kconfig           |   10 +
 drivers/spi/Makefile          |    1 +
 drivers/spi/spi-airoha-snfi.c | 1140 +++++++++++++++++++++++++++++++++
 4 files changed, 1160 insertions(+)
 create mode 100644 drivers/spi/spi-airoha-snfi.c

diff --git a/MAINTAINERS b/MAINTAINERS
index aa3b947fb080..ce9fac46f741 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -653,6 +653,15 @@ S:	Supported
 F:	fs/aio.c
 F:	include/linux/*aio*.h
 
+AIROHA SPI SNFI DRIVER
+M:	Lorenzo Bianconi <lorenzo@kernel.org>
+M:	Ray Liu <ray.liu@airoha.com>
+L:	linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
+L:	linux-spi@vger.kernel.org
+S:	Maintained
+F:	Documentation/devicetree/bindings/spi/airoha,en7581-snand.yaml
+F:	drivers/spi/spi-airoha.c
+
 AIRSPY MEDIA DRIVER
 L:	linux-media@vger.kernel.org
 S:	Orphan
diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index bc7021da2fe9..6fa91775f334 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..bb4360a2ca30
--- /dev/null
+++ b/drivers/spi/spi-airoha-snfi.c
@@ -0,0 +1,1140 @@
+// 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 <asm-generic/unaligned.h>
+#include <linux/bitfield.h>
+#include <linux/clk.h>
+#include <linux/device.h>
+#include <linux/dma-mapping.h>
+#include <linux/types.h>
+#include <linux/math.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/sizes.h>
+#include <linux/spi/spi.h>
+#include <linux/spi/spi-mem.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:
+		/* check dummy cycle first */
+		if (op->dummy.nbytes * BITS_PER_BYTE / op->dummy.buswidth > 0xf)
+			return false;
+
+		/* quad io / quad out */
+		if ((op->addr.buswidth == 4 || op->addr.buswidth == 1) &&
+		    op->data.buswidth == 4)
+			return true;
+
+		/* dual io / dual out */
+		if ((op->addr.buswidth == 2 || op->addr.buswidth == 1) &&
+		    op->data.buswidth == 2)
+			return true;
+
+		/* standard spi */
+		if (op->addr.buswidth == 1 && op->data.buswidth == 1)
+			return true;
+		break;
+	case SPI_MEM_DATA_OUT:
+		/* check dummy cycle first */
+		if (op->dummy.nbytes)
+			return false;
+
+		/* program load quad out */
+		if (op->addr.buswidth == 1 && op->data.buswidth == 4)
+			return true;
+
+		/* standard spi */
+		if (op->addr.buswidth == 1 && op->data.buswidth == 1)
+			return true;
+	default:
+		break;
+	}
+
+	return false;
+}
+
+static int airoha_snand_adjust_op_size(struct spi_mem *mem,
+				       struct spi_mem_op *op)
+{
+	struct airoha_snand_ctrl *as_ctrl;
+	size_t len;
+
+	as_ctrl = spi_controller_get_devdata(mem->spi->controller);
+	if (airoha_snand_is_page_ops(op)) {
+		len = as_ctrl->nfi_cfg.sec_size;
+		len += as_ctrl->nfi_cfg.spare_size;
+		len *= as_ctrl->nfi_cfg.sec_num;
+		op->data.nbytes = min_t(size_t, op->data.nbytes, len);
+	} else {
+		len = 1 + op->addr.nbytes + op->dummy.nbytes;
+		if (len >= 160)
+			return -EOPNOTSUPP;
+
+		op->data.nbytes = min_t(size_t, op->data.nbytes, 160 - 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, 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,
+				       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,
+				       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, 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 = 0; i < op->addr.nbytes; i++) {
+		err = airoha_snand_write_data(as_ctrl, cmd,
+					      &data[8 - op->addr.nbytes + 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);
+	devm_kfree(as_ctrl->dev, as_dev->txrx_buf);
+	devm_kfree(as_ctrl->dev, as_dev);
+
+	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;
+	struct resource *res;
+	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_get_and_ioremap_resource(pdev, 0, &res);
+	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_get_and_ioremap_resource(pdev, 1, &res);
+	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->dev.of_node = dev->of_node;
+	ctrl->setup = airoha_snand_setup;
+	ctrl->cleanup = airoha_snand_cleanup;
+
+	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");
-- 
2.44.0

Re: [PATCH v4 3/3] spi: airoha: add SPI-NAND Flash controller driver

[Andy Shevchenko]

On Fri, Apr 26, 2024 at 11:31 AM Lorenzo Bianconi <lorenzo@kernel.org> wrote:
>
> Introduce support for SPI-NAND driver of the Airoha NAND Flash Interface
> found on Airoha ARM SoCs.

...

> +#include <asm-generic/unaligned.h>

No driver should include asm-generic, basically 99.9% of the kernel
code must not do that. I.o.w. asm-generic is very special.

> +#include <linux/bitfield.h>
> +#include <linux/clk.h>

+ delay.h

> +#include <linux/device.h>
> +#include <linux/dma-mapping.h>

+ errno.h

> +#include <linux/types.h>

Can you make it ordered (I noticed this after a while)?

+ limits.h

> +#include <linux/math.h>

+ minmax.h

> +#include <linux/module.h>
> +#include <linux/mutex.h>
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +#include <linux/sizes.h>
> +#include <linux/spi/spi.h>
> +#include <linux/spi/spi-mem.h>

+ types.h

Also note, we usually place headers from more generic to less, hence
linux/* followed by asm/* and not vice versa.

...

> +struct airoha_snand_dev {
> +       size_t buf_len;
> +
> +       u8 *txrx_buf;
> +       dma_addr_t dma_addr;
> +
> +       u64 cur_page_num;
> +       bool data_need_update;
> +};

...

> +               /* quad io / quad out */

io --> in ?

...

> +               /* dual io / dual out */

Ditto.

...

> +       case SPI_MEM_DATA_OUT:
> +               /* check dummy cycle first */
> +               if (op->dummy.nbytes)
> +                       return false;
> +
> +               /* program load quad out */
> +               if (op->addr.buswidth == 1 && op->data.buswidth == 4)
> +                       return true;
> +
> +               /* standard spi */
> +               if (op->addr.buswidth == 1 && op->data.buswidth == 1)
> +                       return true;

> +       default:
> +               break;
> +       }
> +
> +       return false;

Why not return false directly from the default case?

...

> +               op->data.nbytes = min_t(size_t, op->data.nbytes, 160 - len);

You probably wanted clamp(). It's discouraged to use min_t() for unsigned types.

...

> +       err = regmap_read_poll_timeout(as_ctrl->regmap_nfi, REG_SPI_NFI_INTR,
> +                                      val, (val & SPI_NFI_AHB_DONE), 0,
> +                                      USEC_PER_SEC);

Perhaps
  1 * USEC_PER_SEC
?

Easy to read plain numbers like this to get the idea "this is 1 SEC
timeout". Also editors highlight plain integers with a different
colour.

...

> +       /* addr part */
> +       cmd = opcode == SPI_NAND_OP_GET_FEATURE ? 0x11 : 0x8;
> +       put_unaligned_be64(op->addr.val, data);

> +       for (i = 0; i < op->addr.nbytes; i++) {
> +               err = airoha_snand_write_data(as_ctrl, cmd,
> +                                             &data[8 - op->addr.nbytes + i],

Now you can update a for loop to make this prettier, right?

> +                                             sizeof(data[0]));
> +               if (err)
> +                       return err;
> +       }

       for (i = 8 - op->addr.nbytes; i < 8; i++) {
               err = airoha_snand_write_data(as_ctrl, cmd, &data[i],
                                             sizeof(data[0]));
               ...
       }

Note, 8 can be replaced by sizeof() / ARRAY_SIZE() but I'm not insisting.

...

> +       devm_kfree(as_ctrl->dev, as_dev->txrx_buf);
> +       devm_kfree(as_ctrl->dev, as_dev);

Why?! Using devm_*free() explicitly hints about either
misunderstanding of devm concept, or object's lifetime.

...

> +       spi_set_ctldata(spi, NULL);

Seems there is no consensus on NULLifying this (when, if even needed),
but it's fine.

...

> +       base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);

How is 'res' being used exactly?

> +       if (IS_ERR(base))
> +               return PTR_ERR(base);

...

> +       base = devm_platform_get_and_ioremap_resource(pdev, 1, &res);

Ditto.

> +       if (IS_ERR(base))
> +               return PTR_ERR(base);


...

> +       ctrl->dev.of_node = dev->of_node;

Use device_set_node() instead.
You might need dev_fwnode() from property.h.

-- 
With Best Regards,
Andy Shevchenko

Re: [PATCH v4 3/3] spi: airoha: add SPI-NAND Flash controller driver

[Lorenzo Bianconi]

[-- Attachment #1: Type: text/plain, Size: 5306 bytes --]

> On Fri, Apr 26, 2024 at 11:31 AM Lorenzo Bianconi <lorenzo@kernel.org> wrote:
> >
> > Introduce support for SPI-NAND driver of the Airoha NAND Flash Interface
> > found on Airoha ARM SoCs.
> 
> ...
> 
> > +#include <asm-generic/unaligned.h>
> 
> No driver should include asm-generic, basically 99.9% of the kernel
> code must not do that. I.o.w. asm-generic is very special.
> 

ack we can use <asm/unaligned.h> instead

> > +#include <linux/bitfield.h>
> > +#include <linux/clk.h>
> 
> + delay.h
> 
> > +#include <linux/device.h>
> > +#include <linux/dma-mapping.h>
> 
> + errno.h
> 
> > +#include <linux/types.h>
> 
> Can you make it ordered (I noticed this after a while)?
> 
> + limits.h
> 
> > +#include <linux/math.h>
> 
> + minmax.h
> 
> > +#include <linux/module.h>
> > +#include <linux/mutex.h>
> > +#include <linux/platform_device.h>
> > +#include <linux/regmap.h>
> > +#include <linux/sizes.h>
> > +#include <linux/spi/spi.h>
> > +#include <linux/spi/spi-mem.h>
> 
> + types.h
> 
> Also note, we usually place headers from more generic to less, hence
> linux/* followed by asm/* and not vice versa.

ack, I will fix it.

> 
> ...
> 
> > +struct airoha_snand_dev {
> > +       size_t buf_len;
> > +
> > +       u8 *txrx_buf;
> > +       dma_addr_t dma_addr;
> > +
> > +       u64 cur_page_num;
> > +       bool data_need_update;
> > +};
> 
> ...
> 
> > +               /* quad io / quad out */
> 
> io --> in ?

ack, I will fix it.

> 
> ...
> 
> > +               /* dual io / dual out */
> 
> Ditto.
> 
> ...
> 
> > +       case SPI_MEM_DATA_OUT:
> > +               /* check dummy cycle first */
> > +               if (op->dummy.nbytes)
> > +                       return false;
> > +
> > +               /* program load quad out */
> > +               if (op->addr.buswidth == 1 && op->data.buswidth == 4)
> > +                       return true;
> > +
> > +               /* standard spi */
> > +               if (op->addr.buswidth == 1 && op->data.buswidth == 1)
> > +                       return true;
> 
> > +       default:
> > +               break;
> > +       }
> > +
> > +       return false;
> 
> Why not return false directly from the default case?

it is because we still need the 'return false' at the end of routine for the
other cases due to SPI_MEM_DATA_IN and SPI_MEM_DATA_OUT.

> 
> ...
> 
> > +               op->data.nbytes = min_t(size_t, op->data.nbytes, 160 - len);
> 
> You probably wanted clamp(). It's discouraged to use min_t() for unsigned types.

do you mean doing something like:

op->data.nbytes = clamp(op->data.nbytes, op->data.nbytes, 160 - len);

maybe an 'if' condition is more readable, what do you think?

> 
> ...
> 
> > +       err = regmap_read_poll_timeout(as_ctrl->regmap_nfi, REG_SPI_NFI_INTR,
> > +                                      val, (val & SPI_NFI_AHB_DONE), 0,
> > +                                      USEC_PER_SEC);
> 
> Perhaps
>   1 * USEC_PER_SEC
> ?
> 
> Easy to read plain numbers like this to get the idea "this is 1 SEC
> timeout". Also editors highlight plain integers with a different
> colour.
> 
> ...
> 
> > +       /* addr part */
> > +       cmd = opcode == SPI_NAND_OP_GET_FEATURE ? 0x11 : 0x8;
> > +       put_unaligned_be64(op->addr.val, data);
> 
> > +       for (i = 0; i < op->addr.nbytes; i++) {
> > +               err = airoha_snand_write_data(as_ctrl, cmd,
> > +                                             &data[8 - op->addr.nbytes + i],
> 
> Now you can update a for loop to make this prettier, right?
> 
> > +                                             sizeof(data[0]));
> > +               if (err)
> > +                       return err;
> > +       }
> 
>        for (i = 8 - op->addr.nbytes; i < 8; i++) {
>                err = airoha_snand_write_data(as_ctrl, cmd, &data[i],
>                                              sizeof(data[0]));
>                ...
>        }
> 
> Note, 8 can be replaced by sizeof() / ARRAY_SIZE() but I'm not insisting.

ack, I agree. I will fix it.

> 
> ...
> 
> > +       devm_kfree(as_ctrl->dev, as_dev->txrx_buf);
> > +       devm_kfree(as_ctrl->dev, as_dev);
> 
> Why?! Using devm_*free() explicitly hints about either
> misunderstanding of devm concept, or object's lifetime.

ack, I agree, we can get rid of them.

> 
> ...
> 
> > +       spi_set_ctldata(spi, NULL);
> 
> Seems there is no consensus on NULLifying this (when, if even needed),
> but it's fine.
> 
> ...
> 
> > +       base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
> 
> How is 'res' being used exactly?

right, we can pass NULL here to devm_platform_get_and_ioremap_resource()

> 
> > +       if (IS_ERR(base))
> > +               return PTR_ERR(base);
> 
> ...
> 
> > +       base = devm_platform_get_and_ioremap_resource(pdev, 1, &res);
> 
> Ditto.
> 
> > +       if (IS_ERR(base))
> > +               return PTR_ERR(base);
> 
> 
> ...
> 
> > +       ctrl->dev.of_node = dev->of_node;
> 
> Use device_set_node() instead.
> You might need dev_fwnode() from property.h.

ack, I will fix it.

Regards,
Lorenzo

> 
> -- 
> With Best Regards,
> Andy Shevchenko

[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 228 bytes --]

Re: [PATCH v4 3/3] spi: airoha: add SPI-NAND Flash controller driver

[Andy Shevchenko]

On Fri, Apr 26, 2024 at 7:19 PM Lorenzo Bianconi <lorenzo@kernel.org> wrote:
> > On Fri, Apr 26, 2024 at 11:31 AM Lorenzo Bianconi <lorenzo@kernel.org> wrote:

...

> > > +       default:
> > > +               break;
> > > +       }
> > > +
> > > +       return false;
> >
> > Why not return false directly from the default case?
>
> it is because we still need the 'return false' at the end of routine for the
> other cases due to SPI_MEM_DATA_IN and SPI_MEM_DATA_OUT.

Hmm... Can it be refactored? I think it would still be possible to
slightly reduce the amount of LoCs.

...

> > > +               op->data.nbytes = min_t(size_t, op->data.nbytes, 160 - len);
> >
> > You probably wanted clamp(). It's discouraged to use min_t() for unsigned types.
>
> do you mean doing something like:
>
> op->data.nbytes = clamp(op->data.nbytes, op->data.nbytes, 160 - len);
>
> maybe an 'if' condition is more readable, what do you think?

Yes, since we have only one branch of change.

...

> > > +       base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
> >
> > How is 'res' being used exactly?
>
> right, we can pass NULL here to devm_platform_get_and_ioremap_resource()

No, just use another call that doesn't require this parameter at all.

...

> > > +       base = devm_platform_get_and_ioremap_resource(pdev, 1, &res);
> >
> > Ditto.

-- 
With Best Regards,
Andy Shevchenko

Re: [PATCH v4 3/3] spi: airoha: add SPI-NAND Flash controller driver

[kernel test robot]

Hi Lorenzo,

kernel test robot noticed the following build warnings:

[auto build test WARNING on next-20240424]
[cannot apply to broonie-spi/for-next robh/for-next linus/master v6.9-rc5 v6.9-rc4 v6.9-rc3 v6.9-rc5]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Lorenzo-Bianconi/dt-bindings-spi-airoha-Add-YAML-schema-for-SNFI-controller/20240426-164345
base:   next-20240424
patch link:    https://lore.kernel.org/r/2047e9c8372b51dc263178a12e194b8826f1abe7.1714119615.git.lorenzo%40kernel.org
patch subject: [PATCH v4 3/3] spi: airoha: add SPI-NAND Flash controller driver
config: hexagon-allyesconfig (https://download.01.org/0day-ci/archive/20240428/202404280541.VkXyenQ3-lkp@intel.com/config)
compiler: clang version 19.0.0git (https://github.com/llvm/llvm-project 5ef5eb66fb428aaf61fb51b709f065c069c11242)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240428/202404280541.VkXyenQ3-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202404280541.VkXyenQ3-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from drivers/spi/spi-airoha-snfi.c:12:
   In file included from include/linux/dma-mapping.h:11:
   In file included from include/linux/scatterlist.h:8:
   In file included from include/linux/mm.h:2254:
   include/linux/vmstat.h:514:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
     514 |         return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_"
         |                               ~~~~~~~~~~~ ^ ~~~
   In file included from drivers/spi/spi-airoha-snfi.c:12:
   In file included from include/linux/dma-mapping.h:11:
   In file included from include/linux/scatterlist.h:9:
   In file included from arch/hexagon/include/asm/io.h:328:
   include/asm-generic/io.h:548:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     548 |         val = __raw_readb(PCI_IOBASE + addr);
         |                           ~~~~~~~~~~ ^
   include/asm-generic/io.h:561:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     561 |         val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr));
         |                                                         ~~~~~~~~~~ ^
   include/uapi/linux/byteorder/little_endian.h:37:51: note: expanded from macro '__le16_to_cpu'
      37 | #define __le16_to_cpu(x) ((__force __u16)(__le16)(x))
         |                                                   ^
   In file included from drivers/spi/spi-airoha-snfi.c:12:
   In file included from include/linux/dma-mapping.h:11:
   In file included from include/linux/scatterlist.h:9:
   In file included from arch/hexagon/include/asm/io.h:328:
   include/asm-generic/io.h:574:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     574 |         val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr));
         |                                                         ~~~~~~~~~~ ^
   include/uapi/linux/byteorder/little_endian.h:35:51: note: expanded from macro '__le32_to_cpu'
      35 | #define __le32_to_cpu(x) ((__force __u32)(__le32)(x))
         |                                                   ^
   In file included from drivers/spi/spi-airoha-snfi.c:12:
   In file included from include/linux/dma-mapping.h:11:
   In file included from include/linux/scatterlist.h:9:
   In file included from arch/hexagon/include/asm/io.h:328:
   include/asm-generic/io.h:585:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     585 |         __raw_writeb(value, PCI_IOBASE + addr);
         |                             ~~~~~~~~~~ ^
   include/asm-generic/io.h:595:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     595 |         __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
         |                                                       ~~~~~~~~~~ ^
   include/asm-generic/io.h:605:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     605 |         __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
         |                                                       ~~~~~~~~~~ ^
>> drivers/spi/spi-airoha-snfi.c:581:2: warning: unannotated fall-through between switch labels [-Wimplicit-fallthrough]
     581 |         default:
         |         ^
   drivers/spi/spi-airoha-snfi.c:581:2: note: insert 'break;' to avoid fall-through
     581 |         default:
         |         ^
         |         break; 
   8 warnings generated.


vim +581 drivers/spi/spi-airoha-snfi.c

   539	
   540	static bool airoha_snand_is_page_ops(const struct spi_mem_op *op)
   541	{
   542		if (op->addr.nbytes != 2)
   543			return false;
   544	
   545		if (op->addr.buswidth != 1 && op->addr.buswidth != 2 &&
   546		    op->addr.buswidth != 4)
   547			return false;
   548	
   549		switch (op->data.dir) {
   550		case SPI_MEM_DATA_IN:
   551			/* check dummy cycle first */
   552			if (op->dummy.nbytes * BITS_PER_BYTE / op->dummy.buswidth > 0xf)
   553				return false;
   554	
   555			/* quad io / quad out */
   556			if ((op->addr.buswidth == 4 || op->addr.buswidth == 1) &&
   557			    op->data.buswidth == 4)
   558				return true;
   559	
   560			/* dual io / dual out */
   561			if ((op->addr.buswidth == 2 || op->addr.buswidth == 1) &&
   562			    op->data.buswidth == 2)
   563				return true;
   564	
   565			/* standard spi */
   566			if (op->addr.buswidth == 1 && op->data.buswidth == 1)
   567				return true;
   568			break;
   569		case SPI_MEM_DATA_OUT:
   570			/* check dummy cycle first */
   571			if (op->dummy.nbytes)
   572				return false;
   573	
   574			/* program load quad out */
   575			if (op->addr.buswidth == 1 && op->data.buswidth == 4)
   576				return true;
   577	
   578			/* standard spi */
   579			if (op->addr.buswidth == 1 && op->data.buswidth == 1)
   580				return true;
 > 581		default:
   582			break;
   583		}
   584	
   585		return false;
   586	}
   587	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki