Merge tag 'nand/for-6.3' into mtd/next

NAND core changes:
* Check the data only read pattern only once
* Prepare the late addition of supported operation checks
* Support for sequential cache reads
* Fix nand_chip kdoc

Raw NAND changes:
* Fsl_elbc: Propagate HW ECC settings to HW
* Marvell: Add missing layouts
* Pasemi: Don't use static data to track per-device state
* Sunxi:
  - Fix the size of the last OOB region
  - Remove an unnecessary check
  - Remove an unnecessary check
  - Clean up chips after failed init
  - Precompute the ECC_CTL register value
  - Embed sunxi_nand_hw_ecc by value
  - Update OOB layout to match hardware
* tmio_nand: Remove driver
* vf610_nfc: Use regular comments for functions

SPI-NAND changes:
* Add support for AllianceMemory AS5F34G04SND
* Macronix: use scratch buffer for DMA operation

NAND ECC changes:
* Mediatek:
  - Add ECC support fot MT7986 IC
  - Add compatible for MT7986
  - dt-bindings: Split ECC engine with rawnand controller

Documentation/devicetree/bindings/mtd/mediatek,mtk-nfc.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mtd/mediatek,mtk-nfc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: MediaTek(MTK) SoCs raw NAND FLASH controller (NFC)
+
+maintainers:
+  - Xiangsheng Hou <xiangsheng.hou@mediatek.com>
+
+properties:
+  compatible:
+    enum:
+      - mediatek,mt2701-nfc
+      - mediatek,mt2712-nfc
+      - mediatek,mt7622-nfc
+
+  reg:
+    items:
+      - description: Base physical address and size of NFI.
+
+  interrupts:
+    items:
+      - description: NFI interrupt
+
+  clocks:
+    items:
+      - description: clock used for the controller
+      - description: clock used for the pad
+
+  clock-names:
+    items:
+      - const: nfi_clk
+      - const: pad_clk
+
+  ecc-engine:
+    description: device-tree node of the required ECC engine.
+    $ref: /schemas/types.yaml#/definitions/phandle
+
+patternProperties:
+  "^nand@[a-f0-9]$":
+    $ref: nand-chip.yaml#
+    unevaluatedProperties: false
+    properties:
+      reg:
+        maximum: 1
+      nand-on-flash-bbt: true
+      nand-ecc-mode:
+        const: hw
+
+allOf:
+  - $ref: nand-controller.yaml#
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: mediatek,mt2701-nfc
+    then:
+      patternProperties:
+        "^nand@[a-f0-9]$":
+          properties:
+            nand-ecc-step-size:
+              enum: [ 512, 1024 ]
+            nand-ecc-strength:
+              enum: [4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 28, 32, 36,
+                     40, 44, 48, 52, 56, 60]
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: mediatek,mt2712-nfc
+    then:
+      patternProperties:
+        "^nand@[a-f0-9]$":
+          properties:
+            nand-ecc-step-size:
+              enum: [ 512, 1024 ]
+            nand-ecc-strength:
+              enum: [4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 28, 32, 36,
+                     40, 44, 48, 52, 56, 60, 68, 72, 80]
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: mediatek,mt7622-nfc
+    then:
+      patternProperties:
+        "^nand@[a-f0-9]$":
+          properties:
+            nand-ecc-step-size:
+              const: 512
+            nand-ecc-strength:
+              enum: [4, 6, 8, 10, 12]
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - clocks
+  - clock-names
+  - ecc-engine
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/mt2701-clk.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+    soc {
+        #address-cells = <2>;
+        #size-cells = <2>;
+
+        nand-controller@1100d000 {
+            compatible = "mediatek,mt2701-nfc";
+            reg = <0 0x1100d000 0 0x1000>;
+            interrupts = <GIC_SPI 56 IRQ_TYPE_LEVEL_LOW>;
+            clocks = <&pericfg CLK_PERI_NFI>,
+                     <&pericfg CLK_PERI_NFI_PAD>;
+            clock-names = "nfi_clk", "pad_clk";
+            ecc-engine = <&bch>;
+            #address-cells = <1>;
+            #size-cells = <0>;
+
+            nand@0 {
+                reg = <0>;
+
+                nand-on-flash-bbt;
+                nand-ecc-mode = "hw";
+                nand-ecc-step-size = <1024>;
+                nand-ecc-strength = <24>;
+
+                partitions {
+                    compatible = "fixed-partitions";
+                    #address-cells = <1>;
+                    #size-cells = <1>;
+
+                    preloader@0 {
+                        label = "pl";
+                        read-only;
+                        reg = <0x0 0x400000>;
+                    };
+                    android@400000 {
+                        label = "android";
+                        reg = <0x400000 0x12c00000>;
+                    };
+                };
+            };
+        };
+    };

Documentation/devicetree/bindings/mtd/mediatek,nand-ecc-engine.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mtd/mediatek,nand-ecc-engine.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: MediaTek(MTK) SoCs NAND ECC engine
+
+maintainers:
+  - Xiangsheng Hou <xiangsheng.hou@mediatek.com>
+
+description: |
+  MTK NAND ECC engine can cowork with MTK raw NAND and SPI NAND controller.
+
+properties:
+  compatible:
+    enum:
+      - mediatek,mt2701-ecc
+      - mediatek,mt2712-ecc
+      - mediatek,mt7622-ecc
+      - mediatek,mt7986-ecc
+
+  reg:
+    items:
+      - description: Base physical address and size of ECC.
+
+  interrupts:
+    items:
+      - description: ECC interrupt
+
+  clocks:
+    maxItems: 1
+
+  clock-names:
+    const: nfiecc_clk
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - clocks
+  - clock-names
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/mt2701-clk.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+    soc {
+        #address-cells = <2>;
+        #size-cells = <2>;
+
+        bch: ecc@1100e000 {
+            compatible = "mediatek,mt2701-ecc";
+            reg = <0 0x1100e000 0 0x1000>;
+            interrupts = <GIC_SPI 55 IRQ_TYPE_LEVEL_LOW>;
+            clocks = <&pericfg CLK_PERI_NFI_ECC>;
+            clock-names = "nfiecc_clk";
+        };
+    };

Documentation/devicetree/bindings/mtd/mtk-nand.txt

-MTK SoCs NAND FLASH controller (NFC) DT binding
-
-This file documents the device tree bindings for MTK SoCs NAND controllers.
-The functional split of the controller requires two drivers to operate:
-the nand controller interface driver and the ECC engine driver.
-
-The hardware description for both devices must be captured as device
-tree nodes.
-
-1) NFC NAND Controller Interface (NFI):
-=======================================
-
-The first part of NFC is NAND Controller Interface (NFI) HW.
-Required NFI properties:
-- compatible:			Should be one of
-				"mediatek,mt2701-nfc",
-				"mediatek,mt2712-nfc",
-				"mediatek,mt7622-nfc".
-- reg:				Base physical address and size of NFI.
-- interrupts:			Interrupts of NFI.
-- clocks:			NFI required clocks.
-- clock-names:			NFI clocks internal name.
-- ecc-engine:			Required ECC Engine node.
-- #address-cells:		NAND chip index, should be 1.
-- #size-cells:			Should be 0.
-
-Example:
-
-	nandc: nfi@1100d000 {
-		compatible = "mediatek,mt2701-nfc";
-		reg = <0 0x1100d000 0 0x1000>;
-		interrupts = <GIC_SPI 56 IRQ_TYPE_LEVEL_LOW>;
-		clocks = <&pericfg CLK_PERI_NFI>,
-			 <&pericfg CLK_PERI_NFI_PAD>;
-		clock-names = "nfi_clk", "pad_clk";
-		ecc-engine = <&bch>;
-		#address-cells = <1>;
-		#size-cells = <0>;
-        };
-
-Platform related properties, should be set in {platform_name}.dts:
-- children nodes:	NAND chips.
-
-Children nodes properties:
-- reg:			Chip Select Signal, default 0.
-			Set as reg = <0>, <1> when need 2 CS.
-Optional:
-- nand-on-flash-bbt:	Store BBT on NAND Flash.
-- nand-ecc-mode:	the NAND ecc mode (check driver for supported modes)
-- nand-ecc-step-size:	Number of data bytes covered by a single ECC step.
-			valid values:
-			512 and 1024 on mt2701 and mt2712.
-			512 only on mt7622.
-			1024 is recommended for large page NANDs.
-- nand-ecc-strength:	Number of bits to correct per ECC step.
-			The valid values that each controller supports:
-			mt2701: 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 28,
-				32, 36, 40, 44, 48, 52, 56, 60.
-			mt2712: 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 28,
-				32, 36, 40, 44, 48, 52, 56, 60, 68, 72, 80.
-			mt7622: 4, 6, 8, 10, 12, 14, 16.
-			The strength should be calculated as follows:
-			E = (S - F) * 8 / B
-			S = O / (P / Q)
-				E :	nand-ecc-strength.
-				S :	spare size per sector.
-				F :	FDM size, should be in the range [1,8].
-					It is used to store free oob data.
-				O :	oob size.
-				P :	page size.
-				Q :	nand-ecc-step-size.
-				B :	number of parity bits needed to correct
-					1 bitflip.
-					According to MTK NAND controller design,
-					this number depends on max ecc step size
-					that MTK NAND controller supports.
-					If max ecc step size supported is 1024,
-					then it should be always 14. And if max
-					ecc step size is 512, then it should be
-					always 13.
-			If the result does not match any one of the listed
-			choices above, please select the smaller valid value from
-			the list.
-			(otherwise the driver will do the adjustment at runtime)
-- pinctrl-names:	Default NAND pin GPIO setting name.
-- pinctrl-0:		GPIO setting node.
-
-Example:
-	&pio {
-		nand_pins_default: nanddefault {
-			pins_dat {
-				pinmux = <MT2701_PIN_111_MSDC0_DAT7__FUNC_NLD7>,
-					 <MT2701_PIN_112_MSDC0_DAT6__FUNC_NLD6>,
-					 <MT2701_PIN_114_MSDC0_DAT4__FUNC_NLD4>,
-					 <MT2701_PIN_118_MSDC0_DAT3__FUNC_NLD3>,
-					 <MT2701_PIN_121_MSDC0_DAT0__FUNC_NLD0>,
-					 <MT2701_PIN_120_MSDC0_DAT1__FUNC_NLD1>,
-					 <MT2701_PIN_113_MSDC0_DAT5__FUNC_NLD5>,
-					 <MT2701_PIN_115_MSDC0_RSTB__FUNC_NLD8>,
-					 <MT2701_PIN_119_MSDC0_DAT2__FUNC_NLD2>;
-				input-enable;
-				drive-strength = <MTK_DRIVE_8mA>;
-				bias-pull-up;
-			};
-
-			pins_we {
-				pinmux = <MT2701_PIN_117_MSDC0_CLK__FUNC_NWEB>;
-				drive-strength = <MTK_DRIVE_8mA>;
-				bias-pull-up = <MTK_PUPD_SET_R1R0_10>;
-			};
-
-			pins_ale {
-				pinmux = <MT2701_PIN_116_MSDC0_CMD__FUNC_NALE>;
-				drive-strength = <MTK_DRIVE_8mA>;
-				bias-pull-down = <MTK_PUPD_SET_R1R0_10>;
-			};
-		};
-	};
-
-	&nandc {
-		status = "okay";
-		pinctrl-names = "default";
-		pinctrl-0 = <&nand_pins_default>;
-		nand@0 {
-			reg = <0>;
-			nand-on-flash-bbt;
-			nand-ecc-mode = "hw";
-			nand-ecc-strength = <24>;
-			nand-ecc-step-size = <1024>;
-		};
-	};
-
-NAND chip optional subnodes:
-- Partitions, see Documentation/devicetree/bindings/mtd/mtd.yaml
-
-Example:
-	nand@0 {
-		partitions {
-			compatible = "fixed-partitions";
-			#address-cells = <1>;
-			#size-cells = <1>;
-
-			preloader@0 {
-				label = "pl";
-				read-only;
-				reg = <0x00000000 0x00400000>;
-			};
-			android@00400000 {
-				label = "android";
-				reg = <0x00400000 0x12c00000>;
-			};
-		};
-	};
-
-2) ECC Engine:
-==============
-
-Required BCH properties:
-- compatible:	Should be one of
-		"mediatek,mt2701-ecc",
-		"mediatek,mt2712-ecc",
-		"mediatek,mt7622-ecc".
-- reg:		Base physical address and size of ECC.
-- interrupts:	Interrupts of ECC.
-- clocks:	ECC required clocks.
-- clock-names:	ECC clocks internal name.
-
-Example:
-
-	bch: ecc@1100e000 {
-		compatible = "mediatek,mt2701-ecc";
-		reg = <0 0x1100e000 0 0x1000>;
-		interrupts = <GIC_SPI 55 IRQ_TYPE_LEVEL_LOW>;
-		clocks = <&pericfg CLK_PERI_NFI_ECC>;
-		clock-names = "nfiecc_clk";
-	};

MAINTAINERS

@@ -13213,7 +13213,7 @@ F:	drivers/phy/ralink/phy-mt7621-pci.c
 MEDIATEK NAND CONTROLLER DRIVER
 L:	linux-mtd@lists.infradead.org
 S:	Orphan
-F:	Documentation/devicetree/bindings/mtd/mtk-nand.txt
+F:	Documentation/devicetree/bindings/mtd/mediatek,mtk-nfc.yaml
 F:	drivers/mtd/nand/raw/mtk_*
 
 MEDIATEK PMIC LED DRIVER

drivers/mtd/nand/ecc-mtk.c

@@ -40,6 +40,10 @@
 #define ECC_IDLE_REG(op)	((op) == ECC_ENCODE ? ECC_ENCIDLE : ECC_DECIDLE)
 #define ECC_CTL_REG(op)		((op) == ECC_ENCODE ? ECC_ENCCON : ECC_DECCON)
 
+#define ECC_ERRMASK_MT7622	GENMASK(4, 0)
+#define ECC_ERRMASK_MT2701	GENMASK(5, 0)
+#define ECC_ERRMASK_MT2712	GENMASK(6, 0)
+
 struct mtk_ecc_caps {
 	u32 err_mask;
 	u32 err_shift;
@@ -79,6 +83,10 @@ static const u8 ecc_strength_mt7622[] = {
 	4, 6, 8, 10, 12
 };
 
+static const u8 ecc_strength_mt7986[] = {
+	4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24
+};
+
 enum mtk_ecc_regs {
 	ECC_ENCPAR00,
 	ECC_ENCIRQ_EN,
@@ -451,7 +459,7 @@ unsigned int mtk_ecc_get_parity_bits(struct mtk_ecc *ecc)
 EXPORT_SYMBOL(mtk_ecc_get_parity_bits);
 
 static const struct mtk_ecc_caps mtk_ecc_caps_mt2701 = {
-	.err_mask = 0x3f,
+	.err_mask = ECC_ERRMASK_MT2701,
 	.err_shift = 8,
 	.ecc_strength = ecc_strength_mt2701,
 	.ecc_regs = mt2701_ecc_regs,
@@ -462,7 +470,7 @@ static const struct mtk_ecc_caps mtk_ecc_caps_mt2701 = {
 };
 
 static const struct mtk_ecc_caps mtk_ecc_caps_mt2712 = {
-	.err_mask = 0x7f,
+	.err_mask = ECC_ERRMASK_MT2712,
 	.err_shift = 8,
 	.ecc_strength = ecc_strength_mt2712,
 	.ecc_regs = mt2712_ecc_regs,
@@ -473,7 +481,7 @@ static const struct mtk_ecc_caps mtk_ecc_caps_mt2712 = {
 };
 
 static const struct mtk_ecc_caps mtk_ecc_caps_mt7622 = {
-	.err_mask = 0x1f,
+	.err_mask = ECC_ERRMASK_MT7622,
 	.err_shift = 5,
 	.ecc_strength = ecc_strength_mt7622,
 	.ecc_regs = mt7622_ecc_regs,
@@ -483,6 +491,17 @@ static const struct mtk_ecc_caps mtk_ecc_caps_mt7622 = {
 	.pg_irq_sel = 0,
 };
 
+static const struct mtk_ecc_caps mtk_ecc_caps_mt7986 = {
+	.err_mask = ECC_ERRMASK_MT7622,
+	.err_shift = 8,
+	.ecc_strength = ecc_strength_mt7986,
+	.ecc_regs = mt2712_ecc_regs,
+	.num_ecc_strength = 11,
+	.ecc_mode_shift = 5,
+	.parity_bits = 14,
+	.pg_irq_sel = 1,
+};
+
 static const struct of_device_id mtk_ecc_dt_match[] = {
 	{
 		.compatible = "mediatek,mt2701-ecc",
@@ -493,6 +512,9 @@ static const struct of_device_id mtk_ecc_dt_match[] = {
 	}, {
 		.compatible = "mediatek,mt7622-ecc",
 		.data = &mtk_ecc_caps_mt7622,
+	}, {
+		.compatible = "mediatek,mt7986-ecc",
+		.data = &mtk_ecc_caps_mt7986,
 	},
 	{},
 };

drivers/mtd/nand/raw/Kconfig

@@ -193,13 +193,6 @@ config MTD_NAND_PASEMI
 	  Enables support for NAND Flash interface on PA Semi PWRficient
 	  based boards
 
-config MTD_NAND_TMIO
-	tristate "Toshiba Mobile IO NAND controller"
-	depends on MFD_TMIO
-	help
-	  Support for NAND flash connected to a Toshiba Mobile IO
-	  Controller in some PDAs, including the Sharp SL6000x.
-
 source "drivers/mtd/nand/raw/brcmnand/Kconfig"
 
 config MTD_NAND_BCM47XXNFLASH

drivers/mtd/nand/raw/Makefile

@@ -23,7 +23,6 @@ omap2_nand-objs := omap2.o
 obj-$(CONFIG_MTD_NAND_OMAP2) 		+= omap2_nand.o
 obj-$(CONFIG_MTD_NAND_OMAP_BCH_BUILD)	+= omap_elm.o
 obj-$(CONFIG_MTD_NAND_MARVELL)		+= marvell_nand.o
-obj-$(CONFIG_MTD_NAND_TMIO)		+= tmio_nand.o
 obj-$(CONFIG_MTD_NAND_PLATFORM)		+= plat_nand.o
 obj-$(CONFIG_MTD_NAND_PASEMI)		+= pasemi_nand.o
 obj-$(CONFIG_MTD_NAND_ORION)		+= orion_nand.o

drivers/mtd/nand/raw/fsl_elbc_nand.c

@@ -725,6 +725,7 @@ static int fsl_elbc_attach_chip(struct nand_chip *chip)
 	struct fsl_lbc_ctrl *ctrl = priv->ctrl;
 	struct fsl_lbc_regs __iomem *lbc = ctrl->regs;
 	unsigned int al;
+	u32 br;
 
 	/*
 	 * if ECC was not chosen in DT, decide whether to use HW or SW ECC from
@@ -764,6 +765,13 @@ static int fsl_elbc_attach_chip(struct nand_chip *chip)
 		return -EINVAL;
 	}
 
+	/* enable/disable HW ECC checking and generating based on if HW ECC was chosen */
+	br = in_be32(&lbc->bank[priv->bank].br) & ~BR_DECC;
+	if (chip->ecc.engine_type == NAND_ECC_ENGINE_TYPE_ON_HOST)
+		out_be32(&lbc->bank[priv->bank].br, br | BR_DECC_CHK_GEN);
+	else
+		out_be32(&lbc->bank[priv->bank].br, br | BR_DECC_OFF);
+
 	/* calculate FMR Address Length field */
 	al = 0;
 	if (chip->pagemask & 0xffff0000)

drivers/mtd/nand/raw/marvell_nand.c

@@ -288,10 +288,17 @@ static const struct marvell_hw_ecc_layout marvell_nfc_layouts[] = {
 	MARVELL_LAYOUT( 2048,   512,  1,  1,  1, 2048, 40, 24,  0,  0,  0),
 	MARVELL_LAYOUT( 2048,   512,  4,  1,  1, 2048, 32, 30,  0,  0,  0),
 	MARVELL_LAYOUT( 2048,   512,  8,  2,  1, 1024,  0, 30,1024,32, 30),
+	MARVELL_LAYOUT( 2048,   512,  8,  2,  1, 1024,  0, 30,1024,64, 30),
+	MARVELL_LAYOUT( 2048,   512,  12, 3,  2, 704,   0, 30,640,  0, 30),
+	MARVELL_LAYOUT( 2048,   512,  16, 5,  4, 512,   0, 30,  0, 32, 30),
 	MARVELL_LAYOUT( 4096,   512,  4,  2,  2, 2048, 32, 30,  0,  0,  0),
 	MARVELL_LAYOUT( 4096,   512,  8,  5,  4, 1024,  0, 30,  0, 64, 30),
+	MARVELL_LAYOUT( 4096,   512,  12, 6,  5, 704,   0, 30,576, 32, 30),
+	MARVELL_LAYOUT( 4096,   512,  16, 9,  8, 512,   0, 30,  0, 32, 30),
 	MARVELL_LAYOUT( 8192,   512,  4,  4,  4, 2048,  0, 30,  0,  0,  0),
 	MARVELL_LAYOUT( 8192,   512,  8,  9,  8, 1024,  0, 30,  0, 160, 30),
+	MARVELL_LAYOUT( 8192,   512,  12, 12, 11, 704,  0, 30,448,  64, 30),
+	MARVELL_LAYOUT( 8192,   512,  16, 17, 16, 512,  0, 30,  0,  32, 30),
 };
 
 /**

drivers/mtd/nand/raw/nand_base.c

@@ -1208,6 +1208,73 @@ static int nand_lp_exec_read_page_op(struct nand_chip *chip, unsigned int page,
 	return nand_exec_op(chip, &op);
 }
 
+static int nand_lp_exec_cont_read_page_op(struct nand_chip *chip, unsigned int page,
+					  unsigned int offset_in_page, void *buf,
+					  unsigned int len, bool check_only)
+{
+	const struct nand_interface_config *conf =
+		nand_get_interface_config(chip);
+	u8 addrs[5];
+	struct nand_op_instr start_instrs[] = {
+		NAND_OP_CMD(NAND_CMD_READ0, 0),
+		NAND_OP_ADDR(4, addrs, 0),
+		NAND_OP_CMD(NAND_CMD_READSTART, NAND_COMMON_TIMING_NS(conf, tWB_max)),
+		NAND_OP_WAIT_RDY(NAND_COMMON_TIMING_MS(conf, tR_max), 0),
+		NAND_OP_CMD(NAND_CMD_READCACHESEQ, NAND_COMMON_TIMING_NS(conf, tWB_max)),
+		NAND_OP_WAIT_RDY(NAND_COMMON_TIMING_MS(conf, tR_max),
+				 NAND_COMMON_TIMING_NS(conf, tRR_min)),
+		NAND_OP_DATA_IN(len, buf, 0),
+	};
+	struct nand_op_instr cont_instrs[] = {
+		NAND_OP_CMD(page == chip->cont_read.last_page ?
+			    NAND_CMD_READCACHEEND : NAND_CMD_READCACHESEQ,
+			    NAND_COMMON_TIMING_NS(conf, tWB_max)),
+		NAND_OP_WAIT_RDY(NAND_COMMON_TIMING_MS(conf, tR_max),
+				 NAND_COMMON_TIMING_NS(conf, tRR_min)),
+		NAND_OP_DATA_IN(len, buf, 0),
+	};
+	struct nand_operation start_op = NAND_OPERATION(chip->cur_cs, start_instrs);
+	struct nand_operation cont_op = NAND_OPERATION(chip->cur_cs, cont_instrs);
+	int ret;
+
+	if (!len) {
+		start_op.ninstrs--;
+		cont_op.ninstrs--;
+	}
+
+	ret = nand_fill_column_cycles(chip, addrs, offset_in_page);
+	if (ret < 0)
+		return ret;
+
+	addrs[2] = page;
+	addrs[3] = page >> 8;
+
+	if (chip->options & NAND_ROW_ADDR_3) {
+		addrs[4] = page >> 16;
+		start_instrs[1].ctx.addr.naddrs++;
+	}
+
+	/* Check if cache reads are supported */
+	if (check_only) {
+		if (nand_check_op(chip, &start_op) || nand_check_op(chip, &cont_op))
+			return -EOPNOTSUPP;
+
+		return 0;
+	}
+
+	if (page == chip->cont_read.first_page)
+		return nand_exec_op(chip, &start_op);
+	else
+		return nand_exec_op(chip, &cont_op);
+}
+
+static bool rawnand_cont_read_ongoing(struct nand_chip *chip, unsigned int page)
+{
+	return chip->cont_read.ongoing &&
+		page >= chip->cont_read.first_page &&
+		page <= chip->cont_read.last_page;
+}
+
 /**
  * nand_read_page_op - Do a READ PAGE operation
  * @chip: The NAND chip
@@ -1233,10 +1300,16 @@ int nand_read_page_op(struct nand_chip *chip, unsigned int page,
 		return -EINVAL;
 
 	if (nand_has_exec_op(chip)) {
-		if (mtd->writesize > 512)
-			return nand_lp_exec_read_page_op(chip, page,
-							 offset_in_page, buf,
-							 len);
+		if (mtd->writesize > 512) {
+			if (rawnand_cont_read_ongoing(chip, page))
+				return nand_lp_exec_cont_read_page_op(chip, page,
+								      offset_in_page,
+								      buf, len, false);
+			else
+				return nand_lp_exec_read_page_op(chip, page,
+								 offset_in_page, buf,
+								 len);
+		}
 
 		return nand_sp_exec_read_page_op(chip, page, offset_in_page,
 						 buf, len);
@@ -3353,6 +3426,27 @@ static uint8_t *nand_transfer_oob(struct nand_chip *chip, uint8_t *oob,
 	return NULL;
 }
 
+static void rawnand_enable_cont_reads(struct nand_chip *chip, unsigned int page,
+				      u32 readlen, int col)
+{
+	struct mtd_info *mtd = nand_to_mtd(chip);
+
+	if (!chip->controller->supported_op.cont_read)
+		return;
+
+	if ((col && col + readlen < (3 * mtd->writesize)) ||
+	    (!col && readlen < (2 * mtd->writesize))) {
+		chip->cont_read.ongoing = false;
+		return;
+	}
+
+	chip->cont_read.ongoing = true;
+	chip->cont_read.first_page = page;
+	if (col)
+		chip->cont_read.first_page++;
+	chip->cont_read.last_page = page + ((readlen >> chip->page_shift) & chip->pagemask);
+}
+
 /**
  * nand_setup_read_retry - [INTERN] Set the READ RETRY mode
  * @chip: NAND chip object
@@ -3426,6 +3520,8 @@ static int nand_do_read_ops(struct nand_chip *chip, loff_t from,
 	oob = ops->oobbuf;
 	oob_required = oob ? 1 : 0;
 
+	rawnand_enable_cont_reads(chip, page, readlen, col);
+
 	while (1) {
 		struct mtd_ecc_stats ecc_stats = mtd->ecc_stats;
 
@@ -4991,6 +5087,47 @@ nand_manufacturer_name(const struct nand_manufacturer_desc *manufacturer_desc)
 	return manufacturer_desc ? manufacturer_desc->name : "Unknown";
 }
 
+static void rawnand_check_data_only_read_support(struct nand_chip *chip)
+{
+	/* Use an arbitrary size for the check */
+	if (!nand_read_data_op(chip, NULL, SZ_512, true, true))
+		chip->controller->supported_op.data_only_read = 1;
+}
+
+static void rawnand_early_check_supported_ops(struct nand_chip *chip)
+{
+	/* The supported_op fields should not be set by individual drivers */
+	WARN_ON_ONCE(chip->controller->supported_op.data_only_read);
+
+	if (!nand_has_exec_op(chip))
+		return;
+
+	rawnand_check_data_only_read_support(chip);
+}
+
+static void rawnand_check_cont_read_support(struct nand_chip *chip)
+{
+	struct mtd_info *mtd = nand_to_mtd(chip);
+
+	if (chip->read_retries)
+		return;
+
+	if (!nand_lp_exec_cont_read_page_op(chip, 0, 0, NULL,
+					    mtd->writesize, true))
+		chip->controller->supported_op.cont_read = 1;
+}
+
+static void rawnand_late_check_supported_ops(struct nand_chip *chip)
+{
+	/* The supported_op fields should not be set by individual drivers */
+	WARN_ON_ONCE(chip->controller->supported_op.cont_read);
+
+	if (!nand_has_exec_op(chip))
+		return;
+
+	rawnand_check_cont_read_support(chip);
+}
+
 /*
  * Get the flash and manufacturer id and lookup if the type is supported.
  */
@@ -5023,6 +5160,8 @@ static int nand_detect(struct nand_chip *chip, struct nand_flash_dev *type)
 	/* Select the device */
 	nand_select_target(chip, 0);
 
+	rawnand_early_check_supported_ops(chip);
+
 	/* Send the command for reading device ID */
 	ret = nand_readid_op(chip, 0, id_data, 2);
 	if (ret)
@@ -6325,6 +6464,8 @@ static int nand_scan_tail(struct nand_chip *chip)
 			goto err_free_interface_config;
 	}
 
+	rawnand_late_check_supported_ops(chip);
+
 	/*
 	 * Look for secure regions in the NAND chip. These regions are supposed
 	 * to be protected by a secure element like Trustzone. So the read/write

drivers/mtd/nand/raw/nand_jedec.c

@@ -46,8 +46,7 @@ int nand_jedec_detect(struct nand_chip *chip)
 	if (!p)
 		return -ENOMEM;
 
-	if (!nand_has_exec_op(chip) ||
-	    !nand_read_data_op(chip, p, sizeof(*p), true, true))
+	if (!nand_has_exec_op(chip) || chip->controller->supported_op.data_only_read)
 		use_datain = true;
 
 	for (i = 0; i < JEDEC_PARAM_PAGES; i++) {

drivers/mtd/nand/raw/nand_onfi.c

@@ -166,8 +166,7 @@ int nand_onfi_detect(struct nand_chip *chip)
 	if (!pbuf)
 		return -ENOMEM;
 
-	if (!nand_has_exec_op(chip) ||
-	    !nand_read_data_op(chip, &pbuf[0], sizeof(*pbuf), true, true))
+	if (!nand_has_exec_op(chip) || chip->controller->supported_op.data_only_read)
 		use_datain = true;
 
 	for (i = 0; i < ONFI_PARAM_PAGES; i++) {

drivers/mtd/nand/raw/pasemi_nand.c

@@ -26,9 +26,12 @@
 #define CLE_PIN_CTL			15
 #define ALE_PIN_CTL			14
 
-static unsigned int lpcctl;
-static struct mtd_info *pasemi_nand_mtd;
-static struct nand_controller controller;
+struct pasemi_ddata {
+	struct nand_chip chip;
+	unsigned int lpcctl;
+	struct nand_controller controller;
+};
+
 static const char driver_name[] = "pasemi-nand";
 
 static void pasemi_read_buf(struct nand_chip *chip, u_char *buf, int len)
@@ -55,6 +58,8 @@ static void pasemi_write_buf(struct nand_chip *chip, const u_char *buf,
 static void pasemi_hwcontrol(struct nand_chip *chip, int cmd,
 			     unsigned int ctrl)
 {
+	struct pasemi_ddata *ddata = container_of(chip, struct pasemi_ddata, chip);
+
 	if (cmd == NAND_CMD_NONE)
 		return;
 
@@ -65,12 +70,14 @@ static void pasemi_hwcontrol(struct nand_chip *chip, int cmd,
 
 	/* Push out posted writes */
 	eieio();
-	inl(lpcctl);
+	inl(ddata->lpcctl);
 }
 
 static int pasemi_device_ready(struct nand_chip *chip)
 {
-	return !!(inl(lpcctl) & LBICTRL_LPCCTL_NR);
+	struct pasemi_ddata *ddata = container_of(chip, struct pasemi_ddata, chip);
+
+	return !!(inl(ddata->lpcctl) & LBICTRL_LPCCTL_NR);
 }
 
 static int pasemi_attach_chip(struct nand_chip *chip)
@@ -93,29 +100,31 @@ static int pasemi_nand_probe(struct platform_device *ofdev)
 	struct device_node *np = dev->of_node;
 	struct resource res;
 	struct nand_chip *chip;
+	struct nand_controller *controller;
 	int err = 0;
+	struct pasemi_ddata *ddata;
+	struct mtd_info *pasemi_nand_mtd;
 
 	err = of_address_to_resource(np, 0, &res);
 
 	if (err)
 		return -EINVAL;
 
-	/* We only support one device at the moment */
-	if (pasemi_nand_mtd)
-		return -ENODEV;
-
 	dev_dbg(dev, "pasemi_nand at %pR\n", &res);
 
 	/* Allocate memory for MTD device structure and private data */
-	chip = kzalloc(sizeof(struct nand_chip), GFP_KERNEL);
-	if (!chip) {
+	ddata = kzalloc(sizeof(*ddata), GFP_KERNEL);
+	if (!ddata) {
 		err = -ENOMEM;
 		goto out;
 	}
+	platform_set_drvdata(ofdev, ddata);
+	chip = &ddata->chip;
+	controller = &ddata->controller;
 
-	controller.ops = &pasemi_ops;
-	nand_controller_init(&controller);
-	chip->controller = &controller;
+	controller->ops = &pasemi_ops;
+	nand_controller_init(controller);
+	chip->controller = controller;
 
 	pasemi_nand_mtd = nand_to_mtd(chip);
 
@@ -136,10 +145,10 @@ static int pasemi_nand_probe(struct platform_device *ofdev)
 		goto out_ior;
 	}
 
-	lpcctl = pci_resource_start(pdev, 0);
+	ddata->lpcctl = pci_resource_start(pdev, 0);
 	pci_dev_put(pdev);
 
-	if (!request_region(lpcctl, 4, driver_name)) {
+	if (!request_region(ddata->lpcctl, 4, driver_name)) {
 		err = -EBUSY;
 		goto out_ior;
 	}
@@ -172,45 +181,43 @@ static int pasemi_nand_probe(struct platform_device *ofdev)
 	}
 
 	dev_info(dev, "PA Semi NAND flash at %pR, control at I/O %x\n", &res,
-		 lpcctl);
+		 ddata->lpcctl);
 
 	return 0;
 
  out_cleanup_nand:
 	nand_cleanup(chip);
  out_lpc:
-	release_region(lpcctl, 4);
+	release_region(ddata->lpcctl, 4);
  out_ior:
 	iounmap(chip->legacy.IO_ADDR_R);
  out_mtd:
-	kfree(chip);
+	kfree(ddata);
  out:
 	return err;
 }
 
 static int pasemi_nand_remove(struct platform_device *ofdev)
 {
-	struct nand_chip *chip;
+	struct pasemi_ddata *ddata = platform_get_drvdata(ofdev);
+	struct mtd_info *pasemi_nand_mtd;
 	int ret;
+	struct nand_chip *chip;
 
-	if (!pasemi_nand_mtd)
-		return 0;
-
-	chip = mtd_to_nand(pasemi_nand_mtd);
+	chip = &ddata->chip;
+	pasemi_nand_mtd = nand_to_mtd(chip);
 
 	/* Release resources, unregister device */
 	ret = mtd_device_unregister(pasemi_nand_mtd);
 	WARN_ON(ret);
 	nand_cleanup(chip);
 
-	release_region(lpcctl, 4);
+	release_region(ddata->lpcctl, 4);
 
 	iounmap(chip->legacy.IO_ADDR_R);
 
 	/* Free the MTD device structure */
-	kfree(chip);
-
-	pasemi_nand_mtd = NULL;
+	kfree(ddata);
 
 	return 0;
 }

drivers/mtd/nand/raw/sunxi_nand.c

@@ -172,10 +172,10 @@ struct sunxi_nand_chip_sel {
 /**
  * struct sunxi_nand_hw_ecc - stores information related to HW ECC support
  *
- * @mode: the sunxi ECC mode field deduced from ECC requirements
+ * @ecc_ctl: ECC_CTL register value for this NAND chip
  */
 struct sunxi_nand_hw_ecc {
-	int mode;
+	u32 ecc_ctl;
 };
 
 /**
@@ -193,7 +193,7 @@ struct sunxi_nand_hw_ecc {
 struct sunxi_nand_chip {
 	struct list_head node;
 	struct nand_chip nand;
-	struct sunxi_nand_hw_ecc *ecc;
+	struct sunxi_nand_hw_ecc ecc;
 	unsigned long clk_rate;
 	u32 timing_cfg;
 	u32 timing_ctl;
@@ -421,7 +421,7 @@ static void sunxi_nfc_select_chip(struct nand_chip *nand, unsigned int cs)
 	struct sunxi_nand_chip_sel *sel;
 	u32 ctl;
 
-	if (cs > 0 && cs >= sunxi_nand->nsels)
+	if (cs >= sunxi_nand->nsels)
 		return;
 
 	ctl = readl(nfc->regs + NFC_REG_CTL) &
@@ -689,26 +689,15 @@ static void sunxi_nfc_hw_ecc_enable(struct nand_chip *nand)
 {
 	struct sunxi_nand_chip *sunxi_nand = to_sunxi_nand(nand);
 	struct sunxi_nfc *nfc = to_sunxi_nfc(nand->controller);
-	u32 ecc_ctl;
-
-	ecc_ctl = readl(nfc->regs + NFC_REG_ECC_CTL);
-	ecc_ctl &= ~(NFC_ECC_MODE_MSK | NFC_ECC_PIPELINE |
-		     NFC_ECC_BLOCK_SIZE_MSK);
-	ecc_ctl |= NFC_ECC_EN | NFC_ECC_MODE(sunxi_nand->ecc->mode) |
-		   NFC_ECC_EXCEPTION | NFC_ECC_PIPELINE;
-
-	if (nand->ecc.size == 512)
-		ecc_ctl |= NFC_ECC_BLOCK_512;
 
-	writel(ecc_ctl, nfc->regs + NFC_REG_ECC_CTL);
+	writel(sunxi_nand->ecc.ecc_ctl, nfc->regs + NFC_REG_ECC_CTL);
 }
 
 static void sunxi_nfc_hw_ecc_disable(struct nand_chip *nand)
 {
 	struct sunxi_nfc *nfc = to_sunxi_nfc(nand->controller);
 
-	writel(readl(nfc->regs + NFC_REG_ECC_CTL) & ~NFC_ECC_EN,
-	       nfc->regs + NFC_REG_ECC_CTL);
+	writel(0, nfc->regs + NFC_REG_ECC_CTL);
 }
 
 static inline void sunxi_nfc_user_data_to_buf(u32 user_data, u8 *buf)
@@ -1604,12 +1593,19 @@ static int sunxi_nand_ooblayout_free(struct mtd_info *mtd, int section,
 		return 0;
 	}
 
+	/*
+	 * The controller does not provide access to OOB bytes
+	 * past the end of the ECC data.
+	 */
+	if (section == ecc->steps && ecc->engine_type == NAND_ECC_ENGINE_TYPE_ON_HOST)
+		return -ERANGE;
+
 	oobregion->offset = section * (ecc->bytes + 4);
 
 	if (section < ecc->steps)
 		oobregion->length = 4;
 	else
-		oobregion->offset = mtd->oobsize - oobregion->offset;
+		oobregion->length = mtd->oobsize - oobregion->offset;
 
 	return 0;
 }
@@ -1619,11 +1615,6 @@ static const struct mtd_ooblayout_ops sunxi_nand_ooblayout_ops = {
 	.free = sunxi_nand_ooblayout_free,
 };
 
-static void sunxi_nand_hw_ecc_ctrl_cleanup(struct sunxi_nand_chip *sunxi_nand)
-{
-	kfree(sunxi_nand->ecc);
-}
-
 static int sunxi_nand_hw_ecc_ctrl_init(struct nand_chip *nand,
 				       struct nand_ecc_ctrl *ecc,
 				       struct device_node *np)
@@ -1634,7 +1625,6 @@ static int sunxi_nand_hw_ecc_ctrl_init(struct nand_chip *nand,
 	struct mtd_info *mtd = nand_to_mtd(nand);
 	struct nand_device *nanddev = mtd_to_nanddev(mtd);
 	int nsectors;
-	int ret;
 	int i;
 
 	if (nanddev->ecc.user_conf.flags & NAND_ECC_MAXIMIZE_STRENGTH) {
@@ -1669,10 +1659,6 @@ static int sunxi_nand_hw_ecc_ctrl_init(struct nand_chip *nand,
 	if (ecc->size != 512 && ecc->size != 1024)
 		return -EINVAL;
 
-	sunxi_nand->ecc = kzalloc(sizeof(*sunxi_nand->ecc), GFP_KERNEL);
-	if (!sunxi_nand->ecc)
-		return -ENOMEM;
-
 	/* Prefer 1k ECC chunk over 512 ones */
 	if (ecc->size == 512 && mtd->writesize > 512) {
 		ecc->size = 1024;
@@ -1693,12 +1679,9 @@ static int sunxi_nand_hw_ecc_ctrl_init(struct nand_chip *nand,
 
 	if (i >= ARRAY_SIZE(strengths)) {
 		dev_err(nfc->dev, "unsupported strength\n");
-		ret = -ENOTSUPP;
-		goto err;
+		return -ENOTSUPP;
 	}
 
-	sunxi_nand->ecc->mode = i;
-
 	/* HW ECC always request ECC bytes for 1024 bytes blocks */
 	ecc->bytes = DIV_ROUND_UP(ecc->strength * fls(8 * 1024), 8);
 
@@ -1707,10 +1690,8 @@ static int sunxi_nand_hw_ecc_ctrl_init(struct nand_chip *nand,
 
 	nsectors = mtd->writesize / ecc->size;
 
-	if (mtd->oobsize < ((ecc->bytes + 4) * nsectors)) {
-		ret = -EINVAL;
-		goto err;
-	}
+	if (mtd->oobsize < ((ecc->bytes + 4) * nsectors))
+		return -EINVAL;
 
 	ecc->read_oob = sunxi_nfc_hw_ecc_read_oob;
 	ecc->write_oob = sunxi_nfc_hw_ecc_write_oob;
@@ -1732,26 +1713,13 @@ static int sunxi_nand_hw_ecc_ctrl_init(struct nand_chip *nand,
 	ecc->read_oob_raw = nand_read_oob_std;
 	ecc->write_oob_raw = nand_write_oob_std;
 
-	return 0;
-
-err:
-	kfree(sunxi_nand->ecc);
+	sunxi_nand->ecc.ecc_ctl = NFC_ECC_MODE(i) | NFC_ECC_EXCEPTION |
+				  NFC_ECC_PIPELINE | NFC_ECC_EN;
 
-	return ret;
-}
+	if (ecc->size == 512)
+		sunxi_nand->ecc.ecc_ctl |= NFC_ECC_BLOCK_512;
 
-static void sunxi_nand_ecc_cleanup(struct sunxi_nand_chip *sunxi_nand)
-{
-	struct nand_ecc_ctrl *ecc = &sunxi_nand->nand.ecc;
-
-	switch (ecc->engine_type) {
-	case NAND_ECC_ENGINE_TYPE_ON_HOST:
-		sunxi_nand_hw_ecc_ctrl_cleanup(sunxi_nand);
-		break;
-	case NAND_ECC_ENGINE_TYPE_NONE:
-	default:
-		break;
-	}
+	return 0;
 }
 
 static int sunxi_nand_attach_chip(struct nand_chip *nand)
@@ -1950,6 +1918,24 @@ static const struct nand_controller_ops sunxi_nand_controller_ops = {
 	.exec_op = sunxi_nfc_exec_op,
 };
 
+static void sunxi_nand_chips_cleanup(struct sunxi_nfc *nfc)
+{
+	struct sunxi_nand_chip *sunxi_nand;
+	struct nand_chip *chip;
+	int ret;
+
+	while (!list_empty(&nfc->chips)) {
+		sunxi_nand = list_first_entry(&nfc->chips,
+					      struct sunxi_nand_chip,
+					      node);
+		chip = &sunxi_nand->nand;
+		ret = mtd_device_unregister(nand_to_mtd(chip));
+		WARN_ON(ret);
+		nand_cleanup(chip);
+		list_del(&sunxi_nand->node);
+	}
+}
+
 static int sunxi_nand_chip_init(struct device *dev, struct sunxi_nfc *nfc,
 				struct device_node *np)
 {
@@ -2041,18 +2027,13 @@ static int sunxi_nand_chips_init(struct device *dev, struct sunxi_nfc *nfc)
 {
 	struct device_node *np = dev->of_node;
 	struct device_node *nand_np;
-	int nchips = of_get_child_count(np);
 	int ret;
 
-	if (nchips > 8) {
-		dev_err(dev, "too many NAND chips: %d (max = 8)\n", nchips);
-		return -EINVAL;
-	}
-
 	for_each_child_of_node(np, nand_np) {
 		ret = sunxi_nand_chip_init(dev, nfc, nand_np);
 		if (ret) {
 			of_node_put(nand_np);
+			sunxi_nand_chips_cleanup(nfc);
 			return ret;
 		}
 	}
@@ -2060,25 +2041,6 @@ static int sunxi_nand_chips_init(struct device *dev, struct sunxi_nfc *nfc)
 	return 0;
 }
 
-static void sunxi_nand_chips_cleanup(struct sunxi_nfc *nfc)
-{
-	struct sunxi_nand_chip *sunxi_nand;
-	struct nand_chip *chip;
-	int ret;
-
-	while (!list_empty(&nfc->chips)) {
-		sunxi_nand = list_first_entry(&nfc->chips,
-					      struct sunxi_nand_chip,
-					      node);
-		chip = &sunxi_nand->nand;
-		ret = mtd_device_unregister(nand_to_mtd(chip));
-		WARN_ON(ret);
-		nand_cleanup(chip);
-		sunxi_nand_ecc_cleanup(sunxi_nand);
-		list_del(&sunxi_nand->node);
-	}
-}
-
 static int sunxi_nfc_dma_init(struct sunxi_nfc *nfc, struct resource *r)
 {
 	int ret;

drivers/mtd/nand/raw/vf610_nfc.c

@@ -206,7 +206,7 @@ static inline bool vf610_nfc_kernel_is_little_endian(void)
 #endif
 }
 
-/**
+/*
  * Read accessor for internal SRAM buffer
  * @dst: destination address in regular memory
  * @src: source address in SRAM buffer
@@ -241,7 +241,7 @@ static inline void vf610_nfc_rd_from_sram(void *dst, const void __iomem *src,
 	}
 }
 
-/**
+/*
  * Write accessor for internal SRAM buffer
  * @dst: destination address in SRAM buffer
  * @src: source address in regular memory

drivers/mtd/nand/spi/Makefile

 # SPDX-License-Identifier: GPL-2.0
-spinand-objs := core.o ato.o gigadevice.o macronix.o micron.o paragon.o toshiba.o winbond.o xtx.o
+spinand-objs := core.o alliancememory.o ato.o gigadevice.o macronix.o micron.o paragon.o toshiba.o winbond.o xtx.o
 obj-$(CONFIG_MTD_SPI_NAND) += spinand.o

drivers/mtd/nand/spi/alliancememory.c

+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Author: Mario Kicherer <dev@kicherer.org>
+ */
+
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/mtd/spinand.h>
+
+#define SPINAND_MFR_ALLIANCEMEMORY	0x52
+
+#define AM_STATUS_ECC_BITMASK		(3 << 4)
+
+#define AM_STATUS_ECC_NONE_DETECTED	(0 << 4)
+#define AM_STATUS_ECC_CORRECTED		(1 << 4)
+#define AM_STATUS_ECC_ERRORED		(2 << 4)
+#define AM_STATUS_ECC_MAX_CORRECTED	(3 << 4)
+
+static SPINAND_OP_VARIANTS(read_cache_variants,
+		SPINAND_PAGE_READ_FROM_CACHE_QUADIO_OP(0, 1, NULL, 0),
+		SPINAND_PAGE_READ_FROM_CACHE_X4_OP(0, 1, NULL, 0),
+		SPINAND_PAGE_READ_FROM_CACHE_DUALIO_OP(0, 1, NULL, 0),
+		SPINAND_PAGE_READ_FROM_CACHE_X2_OP(0, 1, NULL, 0),
+		SPINAND_PAGE_READ_FROM_CACHE_OP(true, 0, 1, NULL, 0),
+		SPINAND_PAGE_READ_FROM_CACHE_OP(false, 0, 1, NULL, 0));
+
+static SPINAND_OP_VARIANTS(write_cache_variants,
+			   SPINAND_PROG_LOAD_X4(true, 0, NULL, 0),
+			   SPINAND_PROG_LOAD(true, 0, NULL, 0));
+
+static SPINAND_OP_VARIANTS(update_cache_variants,
+			   SPINAND_PROG_LOAD_X4(false, 0, NULL, 0),
+			   SPINAND_PROG_LOAD(false, 0, NULL, 0));
+
+static int am_get_eccsize(struct mtd_info *mtd)
+{
+	if (mtd->oobsize == 64)
+		return 0x20;
+	else if (mtd->oobsize == 128)
+		return 0x38;
+	else if (mtd->oobsize == 256)
+		return 0x70;
+	else
+		return -EINVAL;
+}
+
+static int am_ooblayout_ecc(struct mtd_info *mtd, int section,
+			    struct mtd_oob_region *region)
+{
+	int ecc_bytes;
+
+	ecc_bytes = am_get_eccsize(mtd);
+	if (ecc_bytes < 0)
+		return ecc_bytes;
+
+	region->offset = mtd->oobsize - ecc_bytes;
+	region->length = ecc_bytes;
+
+	return 0;
+}
+
+static int am_ooblayout_free(struct mtd_info *mtd, int section,
+			     struct mtd_oob_region *region)
+{
+	int ecc_bytes;
+
+	if (section)
+		return -ERANGE;
+
+	ecc_bytes = am_get_eccsize(mtd);
+	if (ecc_bytes < 0)
+		return ecc_bytes;
+
+	/*
+	 * It is unclear how many bytes are used for the bad block marker. We
+	 * reserve the common two bytes here.
+	 *
+	 * The free area in this kind of flash is divided into chunks where the
+	 * first 4 bytes of each chunk are unprotected. The number of chunks
+	 * depends on the specific model. The models with 4096+256 bytes pages
+	 * have 8 chunks, the others 4 chunks.
+	 */
+
+	region->offset = 2;
+	region->length = mtd->oobsize - 2 - ecc_bytes;
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops am_ooblayout = {
+	.ecc = am_ooblayout_ecc,
+	.free = am_ooblayout_free,
+};
+
+static int am_ecc_get_status(struct spinand_device *spinand, u8 status)
+{
+	switch (status & AM_STATUS_ECC_BITMASK) {
+	case AM_STATUS_ECC_NONE_DETECTED:
+		return 0;
+
+	case AM_STATUS_ECC_CORRECTED:
+		/*
+		 * use oobsize to determine the flash model and the maximum of
+		 * correctable errors and return maximum - 1 by convention
+		 */
+		if (spinand->base.mtd.oobsize == 64)
+			return 3;
+		else
+			return 7;
+
+	case AM_STATUS_ECC_ERRORED:
+		return -EBADMSG;
+
+	case AM_STATUS_ECC_MAX_CORRECTED:
+		/*
+		 * use oobsize to determine the flash model and the maximum of
+		 * correctable errors
+		 */
+		if (spinand->base.mtd.oobsize == 64)
+			return 4;
+		else
+			return 8;
+
+	default:
+		break;
+	}
+
+	return -EINVAL;
+}
+
+static const struct spinand_info alliancememory_spinand_table[] = {
+	SPINAND_INFO("AS5F34G04SND",
+		     SPINAND_ID(SPINAND_READID_METHOD_OPCODE_DUMMY, 0x2f),
+		     NAND_MEMORG(1, 2048, 128, 64, 4096, 80, 1, 1, 1),
+		     NAND_ECCREQ(4, 512),
+		     SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
+					      &write_cache_variants,
+					      &update_cache_variants),
+		     SPINAND_HAS_QE_BIT,
+		     SPINAND_ECCINFO(&am_ooblayout,
+				     am_ecc_get_status)),
+};
+
+static const struct spinand_manufacturer_ops alliancememory_spinand_manuf_ops = {
+};
+
+const struct spinand_manufacturer alliancememory_spinand_manufacturer = {
+	.id = SPINAND_MFR_ALLIANCEMEMORY,
+	.name = "AllianceMemory",
+	.chips = alliancememory_spinand_table,
+	.nchips = ARRAY_SIZE(alliancememory_spinand_table),
+	.ops = &alliancememory_spinand_manuf_ops,
+};

drivers/mtd/nand/spi/core.c

@@ -937,6 +937,7 @@ static const struct nand_ops spinand_ops = {
 };
 
 static const struct spinand_manufacturer *spinand_manufacturers[] = {
+	&alliancememory_spinand_manufacturer,
 	&ato_spinand_manufacturer,
 	&gigadevice_spinand_manufacturer,
 	&macronix_spinand_manufacturer,

drivers/mtd/nand/spi/macronix.c

@@ -83,9 +83,10 @@ static int mx35lf1ge4ab_ecc_get_status(struct spinand_device *spinand,
 		 * in order to avoid forcing the wear-leveling layer to move
 		 * data around if it's not necessary.
 		 */
-		if (mx35lf1ge4ab_get_eccsr(spinand, &eccsr))
+		if (mx35lf1ge4ab_get_eccsr(spinand, spinand->scratchbuf))
 			return nanddev_get_ecc_conf(nand)->strength;
 
+		eccsr = *spinand->scratchbuf;
 		if (WARN_ON(eccsr > nanddev_get_ecc_conf(nand)->strength ||
 			    !eccsr))
 			return nanddev_get_ecc_conf(nand)->strength;

include/linux/mtd/rawnand.h

@@ -67,6 +67,8 @@ struct gpio_desc;
 
 /* Extended commands for large page devices */
 #define NAND_CMD_READSTART	0x30
+#define NAND_CMD_READCACHESEQ	0x31
+#define NAND_CMD_READCACHEEND	0x3f
 #define NAND_CMD_RNDOUTSTART	0xE0
 #define NAND_CMD_CACHEDPROG	0x15
 
@@ -1094,10 +1096,20 @@ struct nand_controller_ops {
  *
  * @lock:		lock used to serialize accesses to the NAND controller
  * @ops:		NAND controller operations.
+ * @supported_op:	NAND controller known-to-be-supported operations,
+ *			only writable by the core after initial checking.
+ * @supported_op.data_only_read: The controller supports reading more data from
+ *			the bus without restarting an entire read operation nor
+ *			changing the column.
+ * @supported_op.cont_read: The controller supports sequential cache reads.
  */
 struct nand_controller {
 	struct mutex lock;
 	const struct nand_controller_ops *ops;
+	struct {
+		unsigned int data_only_read: 1;
+		unsigned int cont_read: 1;
+	} supported_op;
 };
 
 static inline void nand_controller_init(struct nand_controller *nfc)
@@ -1248,6 +1260,10 @@ struct nand_secure_region {
  * @read_retries: The number of read retry modes supported
  * @secure_regions: Structure containing the secure regions info
  * @nr_secure_regions: Number of secure regions
+ * @cont_read: Sequential page read internals
+ * @cont_read.ongoing: Whether a continuous read is ongoing or not
+ * @cont_read.first_page: Start of the continuous read operation
+ * @cont_read.last_page: End of the continuous read operation
  * @controller: The hardware controller	structure which is shared among multiple
  *              independent devices
  * @ecc: The ECC controller structure
@@ -1300,6 +1316,11 @@ struct nand_chip {
 	int read_retries;
 	struct nand_secure_region *secure_regions;
 	u8 nr_secure_regions;
+	struct {
+		bool ongoing;
+		unsigned int first_page;
+		unsigned int last_page;
+	} cont_read;
 
 	/* Externals */
 	struct nand_controller *controller;

include/linux/mtd/spinand.h

@@ -260,6 +260,7 @@ struct spinand_manufacturer {
 };
 
 /* SPI NAND manufacturers */
+extern const struct spinand_manufacturer alliancememory_spinand_manufacturer;
 extern const struct spinand_manufacturer ato_spinand_manufacturer;
 extern const struct spinand_manufacturer gigadevice_spinand_manufacturer;
 extern const struct spinand_manufacturer macronix_spinand_manufacturer;