[PATCH linux dev-5.15 v1 0/3] EDAC/nuvoton: Add NPCM memory controller driver

[PATCH linux dev-5.15 v1 0/3] EDAC/nuvoton: Add NPCM memory controller driver

[Marvin Lin]

This patch series add DTS node, dt-bindings document and driver for memory
controller present on Nuvoton NPCM SoCs.

The memory controller supports single bit error correction and double bit
error detection (in-line ECC in which a section 1/8th of the memory device
used to store data is used for ECC storage).

Marvin Lin (3):
  arm: dts: nuvoton: Add node for NPCM memory controller
  dt-bindings: edac: nuvoton: Add document for NPCM memory controller
  EDAC/nuvoton: Add NPCM memory controller driver

 .../edac/nuvoton,npcm-memory-controller.yaml  |  54 ++
 MAINTAINERS                                   |   6 +
 .../boot/dts/nuvoton/nuvoton-npcm845-evb.dts  |   4 +
 .../boot/dts/nuvoton/nuvoton-npcm845.dtsi     |   7 +
 drivers/edac/Kconfig                          |  11 +
 drivers/edac/Makefile                         |   1 +
 drivers/edac/npcm_edac.c                      | 512 ++++++++++++++++++
 7 files changed, 595 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/edac/nuvoton,npcm-memory-controller.yaml
 create mode 100644 drivers/edac/npcm_edac.c

-- 
2.17.1

[PATCH linux dev-5.15 v1 1/3] arm: dts: nuvoton: Add node for NPCM memory controller

[Marvin Lin]

Add node for memory controller present on Nuvoton NPCM SoCs. The memory
controller supports single bit error correction and double bit error
detection.

Signed-off-by: Marvin Lin <milkfafa@gmail.com>
---
 arch/arm64/boot/dts/nuvoton/nuvoton-npcm845-evb.dts | 4 ++++
 arch/arm64/boot/dts/nuvoton/nuvoton-npcm845.dtsi    | 7 +++++++
 2 files changed, 11 insertions(+)

diff --git a/arch/arm64/boot/dts/nuvoton/nuvoton-npcm845-evb.dts b/arch/arm64/boot/dts/nuvoton/nuvoton-npcm845-evb.dts
index 76137513e567..913c9cbdebee 100644
--- a/arch/arm64/boot/dts/nuvoton/nuvoton-npcm845-evb.dts
+++ b/arch/arm64/boot/dts/nuvoton/nuvoton-npcm845-evb.dts
@@ -438,6 +438,10 @@
 	status = "okay";
 };
 
+&mc {
+	status = "okay";
+};
+
 &pinctrl {
 	pinctrl-names = "default";
 	pinctrl-0 = <
diff --git a/arch/arm64/boot/dts/nuvoton/nuvoton-npcm845.dtsi b/arch/arm64/boot/dts/nuvoton/nuvoton-npcm845.dtsi
index 6a1f75c93f59..100565118a59 100644
--- a/arch/arm64/boot/dts/nuvoton/nuvoton-npcm845.dtsi
+++ b/arch/arm64/boot/dts/nuvoton/nuvoton-npcm845.dtsi
@@ -82,6 +82,13 @@
 	};
 
 	ahb {
+		mc: memory-controller@f0824000 {
+			compatible = "nuvoton,npcm845-memory-controller";
+			reg = <0x0 0xf0824000 0x0 0x1000>;
+			interrupts = <GIC_SPI 25 IRQ_TYPE_LEVEL_HIGH>;
+			status = "disabled";
+		};
+
 		udc0:udc@f0830000 {
 			compatible = "nuvoton,npcm845-udc";
 			reg = <0x0 0xf0830000 0x0 0x1000
-- 
2.17.1

[PATCH linux dev-5.15 v1 2/3] dt-bindings: edac: nuvoton: Add document for NPCM memory controller

[Marvin Lin]

Add dt-bindings document for Nuvoton NPCM memory controller.

Signed-off-by: Marvin Lin <milkfafa@gmail.com>
---
 .../edac/nuvoton,npcm-memory-controller.yaml  | 54 +++++++++++++++++++
 1 file changed, 54 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/edac/nuvoton,npcm-memory-controller.yaml

diff --git a/Documentation/devicetree/bindings/edac/nuvoton,npcm-memory-controller.yaml b/Documentation/devicetree/bindings/edac/nuvoton,npcm-memory-controller.yaml
new file mode 100644
index 000000000000..eb525dd848b2
--- /dev/null
+++ b/Documentation/devicetree/bindings/edac/nuvoton,npcm-memory-controller.yaml
@@ -0,0 +1,54 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/edac/nuvoton,npcm-memory-controller.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Nuvoton NPCM Memory Controller Device Tree Bindings
+
+maintainers:
+  - Marvin Lin <kflin@nuvoton.com>
+  - Stanley Chu <yschu@nuvoton.com>
+
+description: |
+  The Nuvoton BMC SoC supports DDR4 memory with and without ECC (error
+  correction check).
+
+  The memory controller supports single bit error correction, double bit
+  error detection (in-line ECC in which a section (1/8th) of the memory
+  device used to store data is used for ECC storage).
+
+  Note, the bootloader must configure ECC mode for the memory controller.
+
+properties:
+  compatible:
+    enum:
+      - nuvoton,npcm750-memory-controller
+      - nuvoton,npcm845-memory-controller
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - interrupts
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    ahb {
+        #address-cells = <2>;
+        #size-cells = <2>;
+        mc: memory-controller@f0824000 {
+            compatible = "nuvoton,npcm750-memory-controller";
+            reg = <0x0 0xf0824000 0x0 0x1000>;
+            interrupts = <GIC_SPI 25 IRQ_TYPE_LEVEL_HIGH>;
+        };
+    };
-- 
2.17.1

[PATCH linux dev-5.15 v1 3/3] EDAC/nuvoton: Add NPCM memory controller driver

[Marvin Lin]

Add driver for memory controller present on Nuvoton NPCM SoCs. The memory
controller supports single bit error correction and double bit error
detection.

Signed-off-by: Marvin Lin <milkfafa@gmail.com>
---
 MAINTAINERS              |   6 +
 drivers/edac/Kconfig     |  11 +
 drivers/edac/Makefile    |   1 +
 drivers/edac/npcm_edac.c | 512 +++++++++++++++++++++++++++++++++++++++
 4 files changed, 530 insertions(+)
 create mode 100644 drivers/edac/npcm_edac.c

diff --git a/MAINTAINERS b/MAINTAINERS
index be3a3197700f..66804a23cbf3 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -6809,6 +6809,12 @@ L:	linux-edac@vger.kernel.org
 S:	Maintained
 F:	drivers/edac/mpc85xx_edac.[ch]
 
+EDAC-NPCM
+M:	Marvin Lin <kflin@nuvoton.com>
+S:	Maintained
+F:	Documentation/devicetree/bindings/edac/nuvoton,npcm-memory-controller.yaml
+F:	drivers/edac/npcm_edac.c
+
 EDAC-NPCM7XX
 M:	George Hung <george.hung@quantatw.com>
 S:	Maintained
diff --git a/drivers/edac/Kconfig b/drivers/edac/Kconfig
index 836fdefc7967..61b6b01c4b23 100644
--- a/drivers/edac/Kconfig
+++ b/drivers/edac/Kconfig
@@ -546,4 +546,15 @@ config EDAC_NPCM7XX
 	  Support for error detection and correction on the
 	  Nuvoton NPCM7xx DDR memory controller.
 
+config EDAC_NPCM
+	tristate "Nuvoton NPCM DDR Memory Controller"
+	depends on (ARCH_NPCM || COMPILE_TEST)
+	help
+	  Support for error detection and correction on the Nuvoton NPCM DDR
+	  memory controller.
+
+	  The memory controller supports single bit error correction, double bit
+	  error detection (in-line ECC in which a section 1/8th of the memory
+	  device used to store data is used for ECC storage).
+
 endif # EDAC
diff --git a/drivers/edac/Makefile b/drivers/edac/Makefile
index 38bc2262ad8f..01a4f4a4564e 100644
--- a/drivers/edac/Makefile
+++ b/drivers/edac/Makefile
@@ -85,3 +85,4 @@ obj-$(CONFIG_EDAC_ASPEED)		+= aspeed_edac.o
 obj-$(CONFIG_EDAC_BLUEFIELD)		+= bluefield_edac.o
 obj-$(CONFIG_EDAC_DMC520)		+= dmc520_edac.o
 obj-$(CONFIG_EDAC_NPCM7XX)              += npcm7xx_edac.o
+obj-$(CONFIG_EDAC_NPCM)                 += npcm_edac.o
diff --git a/drivers/edac/npcm_edac.c b/drivers/edac/npcm_edac.c
new file mode 100644
index 000000000000..6db2f8bf6b8b
--- /dev/null
+++ b/drivers/edac/npcm_edac.c
@@ -0,0 +1,512 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2022 Nuvoton Technology Corporation
+
+#include <linux/debugfs.h>
+#include <linux/iopoll.h>
+#include <linux/of_device.h>
+#include <linux/regmap.h>
+#include "edac_module.h"
+
+#define EDAC_MOD_NAME	"npcm-edac"
+#define EDAC_MSG_SIZE	256
+
+/* chip serials */
+#define NPCM7XX_CHIP	BIT(0)
+#define NPCM8XX_CHIP	BIT(1)
+
+/* syndrome values */
+#define UE_SYNDROME	0x03
+
+static char data_synd[] = {
+	0xf4, 0xf1, 0xec, 0xea, 0xe9, 0xe6, 0xe5, 0xe3,
+	0xdc, 0xda, 0xd9, 0xd6, 0xd5, 0xd3, 0xce, 0xcb,
+	0xb5, 0xb0, 0xad, 0xab, 0xa8, 0xa7, 0xa4, 0xa2,
+	0x9d, 0x9b, 0x98, 0x97, 0x94, 0x92, 0x8f, 0x8a,
+	0x75, 0x70, 0x6d, 0x6b, 0x68, 0x67, 0x64, 0x62,
+	0x5e, 0x5b, 0x58, 0x57, 0x54, 0x52, 0x4f, 0x4a,
+	0x34, 0x31, 0x2c, 0x2a, 0x29, 0x26, 0x25, 0x23,
+	0x1c, 0x1a, 0x19, 0x16, 0x15, 0x13, 0x0e, 0x0b
+};
+
+static struct regmap *npcm_regmap;
+
+struct npcm_platform_data {
+	/* chip serials */
+	int chip;
+
+	/* memory controller registers */
+	u32 ctl_ecc_en;
+	u32 ctl_int_status;
+	u32 ctl_int_ack;
+	u32 ctl_int_mask_master;
+	u32 ctl_int_mask_ecc;
+	u32 ctl_ce_addr_l;
+	u32 ctl_ce_addr_h;
+	u32 ctl_ce_data_l;
+	u32 ctl_ce_data_h;
+	u32 ctl_ce_synd;
+	u32 ctl_ue_addr_l;
+	u32 ctl_ue_addr_h;
+	u32 ctl_ue_data_l;
+	u32 ctl_ue_data_h;
+	u32 ctl_ue_synd;
+	u32 ctl_source_id;
+	u32 ctl_controller_busy;
+	u32 ctl_xor_check_bits;
+
+	/* masks and shifts */
+	u32 ecc_en_mask;
+	u32 int_status_ce_mask;
+	u32 int_status_ue_mask;
+	u32 int_ack_ce_mask;
+	u32 int_ack_ue_mask;
+	u32 int_mask_master_non_ecc_mask;
+	u32 int_mask_master_global_mask;
+	u32 int_mask_ecc_non_event_mask;
+	u32 ce_addr_h_mask;
+	u32 ce_synd_mask;
+	u32 ce_synd_shift;
+	u32 ue_addr_h_mask;
+	u32 ue_synd_mask;
+	u32 ue_synd_shift;
+	u32 source_id_ce_mask;
+	u32 source_id_ce_shift;
+	u32 source_id_ue_mask;
+	u32 source_id_ue_shift;
+	u32 controller_busy_mask;
+	u32 xor_check_bits_mask;
+	u32 xor_check_bits_shift;
+	u32 writeback_en_mask;
+	u32 fwc_mask;
+};
+
+struct priv_data {
+	void __iomem *reg;
+	char message[EDAC_MSG_SIZE];
+	const struct npcm_platform_data *pdata;
+
+	/* error injection */
+	struct dentry *debugfs;
+	u8 error_type;
+	u8 location;
+	u8 bit;
+};
+
+static void handle_ce(struct mem_ctl_info *mci)
+{
+	struct priv_data *priv = mci->pvt_info;
+	const struct npcm_platform_data *pdata = priv->pdata;
+	u64 addr, data;
+	u32 val_l, val_h, id, synd;
+
+	regmap_read(npcm_regmap, pdata->ctl_ce_addr_l, &val_l);
+	if (pdata->chip == NPCM8XX_CHIP) {
+		regmap_read(npcm_regmap, pdata->ctl_ce_addr_h, &val_h);
+		val_h &= pdata->ce_addr_h_mask;
+	}
+	addr = ((addr | val_h) << 32) | val_l;
+
+	regmap_read(npcm_regmap, pdata->ctl_ce_data_l, &val_l);
+	if (pdata->chip == NPCM8XX_CHIP)
+		regmap_read(npcm_regmap, pdata->ctl_ce_data_h, &val_h);
+	data = ((data | val_h) << 32) | val_l;
+
+	regmap_read(npcm_regmap, pdata->ctl_source_id, &id);
+	id = (id & pdata->source_id_ce_mask) >> pdata->source_id_ce_shift;
+
+	regmap_read(npcm_regmap, pdata->ctl_ce_synd, &synd);
+	synd = (synd & pdata->ce_synd_mask) >> pdata->ce_synd_shift;
+
+	snprintf(priv->message, EDAC_MSG_SIZE,
+		 "addr = 0x%llx, data = 0x%llx, id = 0x%x", addr, data, id);
+
+	edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci, 1, addr >> PAGE_SHIFT,
+			     addr & ~PAGE_MASK, synd, 0, 0, -1, priv->message, "");
+}
+
+static void handle_ue(struct mem_ctl_info *mci)
+{
+	struct priv_data *priv = mci->pvt_info;
+	const struct npcm_platform_data *pdata = priv->pdata;
+	u64 addr, data;
+	u32 val_l, val_h, id, synd;
+
+	regmap_read(npcm_regmap, pdata->ctl_ue_addr_l, &val_l);
+	if (pdata->chip == NPCM8XX_CHIP) {
+		regmap_read(npcm_regmap, pdata->ctl_ue_addr_h, &val_h);
+		val_h &= pdata->ue_addr_h_mask;
+	}
+	addr = ((addr | val_h) << 32) | val_l;
+
+	regmap_read(npcm_regmap, pdata->ctl_ue_data_l, &val_l);
+	if (pdata->chip == NPCM8XX_CHIP)
+		regmap_read(npcm_regmap, pdata->ctl_ue_data_h, &val_h);
+	data = ((data | val_h) << 32) | val_l;
+
+	regmap_read(npcm_regmap, pdata->ctl_source_id, &id);
+	id = (id & pdata->source_id_ue_mask) >> pdata->source_id_ue_shift;
+
+	regmap_read(npcm_regmap, pdata->ctl_ue_synd, &synd);
+	synd = (synd & pdata->ue_synd_mask) >> pdata->ue_synd_shift;
+
+	snprintf(priv->message, EDAC_MSG_SIZE,
+		 "addr = 0x%llx, data = 0x%llx, id = 0x%x", addr, data, id);
+
+	edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1, addr >> PAGE_SHIFT,
+			     addr & ~PAGE_MASK, synd, 0, 0, -1, priv->message, "");
+}
+
+static irqreturn_t edac_ecc_isr(int irq, void *dev_id)
+{
+	struct mem_ctl_info *mci = dev_id;
+	struct priv_data *priv = mci->pvt_info;
+	const struct npcm_platform_data *pdata = priv->pdata;
+	u32 status;
+
+	regmap_read(npcm_regmap, pdata->ctl_int_status, &status);
+	if (status & pdata->int_status_ce_mask) {
+		handle_ce(mci);
+
+		/* acknowledge the CE interrupt */
+		regmap_write(npcm_regmap, pdata->ctl_int_ack,
+			     pdata->int_ack_ce_mask);
+		return IRQ_HANDLED;
+	} else if (status & pdata->int_status_ue_mask) {
+		handle_ue(mci);
+
+		/* acknowledge the UE interrupt */
+		regmap_write(npcm_regmap, pdata->ctl_int_ack,
+			     pdata->int_ack_ue_mask);
+		return IRQ_HANDLED;
+	}
+
+	return IRQ_NONE;
+}
+
+static ssize_t force_ecc_error(struct file *file, const char __user *data,
+			       size_t count, loff_t *ppos)
+{
+	struct device *dev = file->private_data;
+	struct mem_ctl_info *mci = to_mci(dev);
+	struct priv_data *priv = mci->pvt_info;
+	struct npcm_platform_data *pdata = priv->pdata;
+	int ret;
+	u32 val, syndrome;
+
+	/*
+	 * error_type - 0: CE, 1: UE
+	 * location   - 0: data, 1: checkcode
+	 * bit        - 0 ~ 63 for data and 0 ~ 7 for checkcode
+	 */
+	edac_printk(KERN_INFO, EDAC_MOD_NAME,
+		    "force an ECC error, type = %d, location = %d, bit = %d\n",
+		    priv->error_type, priv->location, priv->bit);
+
+	/* ensure no pending writes */
+	ret = regmap_read_poll_timeout(npcm_regmap, pdata->ctl_controller_busy,
+				       val, !(val & pdata->controller_busy_mask),
+				       1000, 10000);
+	if (ret) {
+		edac_printk(KERN_INFO, EDAC_MOD_NAME,
+			    "wait pending writes timeout\n");
+		return count;
+	}
+
+	regmap_read(npcm_regmap, pdata->ctl_xor_check_bits, &val);
+	val &= ~pdata->xor_check_bits_mask;
+
+	/* write syndrome to XOR_CHECK_BITS */
+	if (priv->error_type == 0) {
+		if (priv->location == 0 && priv->bit > 63) {
+			edac_printk(KERN_INFO, EDAC_MOD_NAME,
+				    "data bit should not exceed 63\n");
+			return count;
+		}
+
+		if (priv->location == 1 && priv->bit > 7) {
+			edac_printk(KERN_INFO, EDAC_MOD_NAME,
+				    "checkcode bit should not exceed 7\n");
+			return count;
+		}
+
+		syndrome = priv->location ? 1 << priv->bit :
+			   data_synd[priv->bit];
+
+		regmap_write(npcm_regmap, pdata->ctl_xor_check_bits,
+			     val | (syndrome << pdata->xor_check_bits_shift) |
+			     pdata->writeback_en_mask);
+	} else if (priv->error_type == 1) {
+		regmap_write(npcm_regmap, pdata->ctl_xor_check_bits,
+			     val | (UE_SYNDROME << pdata->xor_check_bits_shift));
+	}
+
+	/* force write check */
+	regmap_update_bits(npcm_regmap, pdata->ctl_xor_check_bits,
+			   pdata->fwc_mask, pdata->fwc_mask);
+
+	return count;
+}
+
+static const struct file_operations force_ecc_error_fops = {
+	.open = simple_open,
+	.write = force_ecc_error,
+	.llseek = generic_file_llseek,
+};
+
+static void setup_debugfs(struct mem_ctl_info *mci)
+{
+	struct priv_data *priv = mci->pvt_info;
+
+	priv->debugfs = edac_debugfs_create_dir(mci->mod_name);
+	if (!priv->debugfs)
+		return;
+
+	edac_debugfs_create_x8("error_type", 0644, priv->debugfs, &priv->error_type);
+	edac_debugfs_create_x8("location", 0644, priv->debugfs, &priv->location);
+	edac_debugfs_create_x8("bit", 0644, priv->debugfs, &priv->bit);
+	edac_debugfs_create_file("force_ecc_error", 0200, priv->debugfs,
+				 &mci->dev, &force_ecc_error_fops);
+}
+
+static int setup_irq(struct mem_ctl_info *mci, struct platform_device *pdev)
+{
+	struct priv_data *priv = mci->pvt_info;
+	const struct npcm_platform_data *pdata = priv->pdata;
+	int ret, irq;
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0) {
+		edac_printk(KERN_ERR, EDAC_MOD_NAME, "IRQ not defined in DTS\n");
+		return irq;
+	}
+
+	ret = devm_request_irq(&pdev->dev, irq, edac_ecc_isr, 0,
+			       dev_name(&pdev->dev), mci);
+	if (ret < 0) {
+		edac_printk(KERN_ERR, EDAC_MOD_NAME, "failed to request IRQ\n");
+		return ret;
+	}
+
+	/* enable the functional group of ECC and mask the others */
+	regmap_write(npcm_regmap, pdata->ctl_int_mask_master,
+		     pdata->int_mask_master_non_ecc_mask);
+
+	if (pdata->chip == NPCM8XX_CHIP)
+		regmap_write(npcm_regmap, pdata->ctl_int_mask_ecc,
+			     pdata->int_mask_ecc_non_event_mask);
+
+	return 0;
+}
+
+static const struct regmap_config npcm_regmap_cfg = {
+	.reg_bits	= 32,
+	.reg_stride	= 4,
+	.val_bits	= 32,
+};
+
+static int edac_probe(struct platform_device *pdev)
+{
+	const struct npcm_platform_data *pdata;
+	struct device *dev = &pdev->dev;
+	struct edac_mc_layer layers[1];
+	struct mem_ctl_info *mci;
+	struct priv_data *priv;
+	void __iomem *reg;
+	int rc;
+	u32 val;
+
+	reg = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(reg))
+		return PTR_ERR(reg);
+
+	npcm_regmap = devm_regmap_init_mmio(dev, reg, &npcm_regmap_cfg);
+	if (IS_ERR(npcm_regmap))
+		return PTR_ERR(npcm_regmap);
+
+	pdata = of_device_get_match_data(dev);
+	if (!pdata)
+		return -EINVAL;
+
+	/* bail out if ECC is not enabled */
+	regmap_read(npcm_regmap, pdata->ctl_ecc_en, &val);
+	if (!(val & pdata->ecc_en_mask)) {
+		edac_printk(KERN_ERR, EDAC_MOD_NAME, "ECC is not enabled\n");
+		return -EPERM;
+	}
+
+	edac_op_state = EDAC_OPSTATE_INT;
+
+	layers[0].type = EDAC_MC_LAYER_ALL_MEM;
+	layers[0].size = 1;
+
+	mci = edac_mc_alloc(0, ARRAY_SIZE(layers), layers,
+			    sizeof(struct priv_data));
+	if (!mci)
+		return -ENOMEM;
+
+	mci->pdev = &pdev->dev;
+	priv = mci->pvt_info;
+	priv->reg = reg;
+	priv->pdata = pdata;
+	platform_set_drvdata(pdev, mci);
+
+	mci->mtype_cap = MEM_FLAG_DDR4;
+	mci->edac_ctl_cap = EDAC_FLAG_SECDED;
+	mci->scrub_cap = SCRUB_FLAG_HW_SRC;
+	mci->scrub_mode = SCRUB_HW_SRC;
+	mci->edac_cap = EDAC_FLAG_SECDED;
+	mci->ctl_name = "npcm_ddr_controller";
+	mci->dev_name = dev_name(&pdev->dev);
+	mci->mod_name = EDAC_MOD_NAME;
+	mci->ctl_page_to_phys = NULL;
+
+	rc = setup_irq(mci, pdev);
+	if (rc)
+		goto free_edac_mc;
+
+	rc = edac_mc_add_mc(mci);
+	if (rc)
+		goto free_edac_mc;
+
+	if (IS_ENABLED(CONFIG_EDAC_DEBUG) && pdata->chip == NPCM8XX_CHIP)
+		setup_debugfs(mci);
+
+	return rc;
+
+free_edac_mc:
+	edac_mc_free(mci);
+	return rc;
+}
+
+static int edac_remove(struct platform_device *pdev)
+{
+	struct mem_ctl_info *mci = platform_get_drvdata(pdev);
+	struct priv_data *priv = mci->pvt_info;
+	const struct npcm_platform_data *pdata = priv->pdata;
+
+	regmap_write(npcm_regmap, pdata->ctl_int_mask_master,
+		     pdata->int_mask_master_global_mask);
+	regmap_update_bits(npcm_regmap, pdata->ctl_ecc_en, pdata->ecc_en_mask,
+			   0);
+
+	edac_mc_del_mc(&pdev->dev);
+	edac_mc_free(mci);
+
+	if (IS_ENABLED(CONFIG_EDAC_DEBUG) && pdata->chip == NPCM8XX_CHIP)
+		edac_debugfs_remove_recursive(priv->debugfs);
+
+	return 0;
+}
+
+static const struct npcm_platform_data npcm750_edac = {
+	.chip				= NPCM7XX_CHIP,
+
+	/* memory controller registers */
+	.ctl_ecc_en			= 0x174,
+	.ctl_int_status			= 0x1d0,
+	.ctl_int_ack			= 0x1d4,
+	.ctl_int_mask_master		= 0x1d8,
+	.ctl_ce_addr_l			= 0x188,
+	.ctl_ce_data_l			= 0x190,
+	.ctl_ce_synd			= 0x18c,
+	.ctl_ue_addr_l			= 0x17c,
+	.ctl_ue_data_l			= 0x184,
+	.ctl_ue_synd			= 0x180,
+	.ctl_source_id			= 0x194,
+
+	/* masks and shifts */
+	.ecc_en_mask			= BIT(24),
+	.int_status_ce_mask		= GENMASK(4, 3),
+	.int_status_ue_mask		= GENMASK(6, 5),
+	.int_ack_ce_mask		= GENMASK(4, 3),
+	.int_ack_ue_mask		= GENMASK(6, 5),
+	.int_mask_master_non_ecc_mask	= GENMASK(30, 7) | GENMASK(2, 0),
+	.int_mask_master_global_mask	= BIT(31),
+	.ce_synd_mask			= GENMASK(6, 0),
+	.ce_synd_shift			= 0,
+	.ue_synd_mask			= GENMASK(6, 0),
+	.ue_synd_shift			= 0,
+	.source_id_ce_mask		= GENMASK(29, 16),
+	.source_id_ce_shift		= 16,
+	.source_id_ue_mask		= GENMASK(13, 0),
+	.source_id_ue_shift		= 0,
+};
+
+static const struct npcm_platform_data npcm845_edac = {
+	.chip =				NPCM8XX_CHIP,
+
+	/* memory controller registers */
+	.ctl_ecc_en			= 0x16c,
+	.ctl_int_status			= 0x228,
+	.ctl_int_ack			= 0x244,
+	.ctl_int_mask_master		= 0x220,
+	.ctl_int_mask_ecc		= 0x260,
+	.ctl_ce_addr_l			= 0x18c,
+	.ctl_ce_addr_h			= 0x190,
+	.ctl_ce_data_l			= 0x194,
+	.ctl_ce_data_h			= 0x198,
+	.ctl_ce_synd			= 0x190,
+	.ctl_ue_addr_l			= 0x17c,
+	.ctl_ue_addr_h			= 0x180,
+	.ctl_ue_data_l			= 0x184,
+	.ctl_ue_data_h			= 0x188,
+	.ctl_ue_synd			= 0x180,
+	.ctl_source_id			= 0x19c,
+	.ctl_controller_busy		= 0x20c,
+	.ctl_xor_check_bits		= 0x174,
+
+	/* masks and shifts */
+	.ecc_en_mask			= GENMASK(17, 16),
+	.int_status_ce_mask		= GENMASK(1, 0),
+	.int_status_ue_mask		= GENMASK(3, 2),
+	.int_ack_ce_mask		= GENMASK(1, 0),
+	.int_ack_ue_mask		= GENMASK(3, 2),
+	.int_mask_master_non_ecc_mask	= GENMASK(30, 3) | GENMASK(1, 0),
+	.int_mask_master_global_mask	= BIT(31),
+	.int_mask_ecc_non_event_mask	= GENMASK(8, 4),
+	.ce_addr_h_mask			= GENMASK(1, 0),
+	.ce_synd_mask			= GENMASK(15, 8),
+	.ce_synd_shift			= 8,
+	.ue_addr_h_mask			= GENMASK(1, 0),
+	.ue_synd_mask			= GENMASK(15, 8),
+	.ue_synd_shift			= 8,
+	.source_id_ce_mask		= GENMASK(29, 16),
+	.source_id_ce_shift		= 16,
+	.source_id_ue_mask		= GENMASK(13, 0),
+	.source_id_ue_shift		= 0,
+	.controller_busy_mask		= BIT(0),
+	.xor_check_bits_mask		= GENMASK(23, 16),
+	.xor_check_bits_shift		= 16,
+	.writeback_en_mask		= BIT(24),
+	.fwc_mask			= BIT(8),
+};
+
+static const struct of_device_id npcm_edac_of_match[] = {
+	{
+		.compatible = "nuvoton,npcm750-memory-controller",
+		.data = &npcm750_edac
+	},
+	{
+		.compatible = "nuvoton,npcm845-memory-controller",
+		.data = &npcm845_edac
+	},
+	{},
+};
+
+MODULE_DEVICE_TABLE(of, npcm_edac_of_match);
+
+static struct platform_driver npcm_edac_driver = {
+	.driver = {
+		.name = "npcm-edac",
+		.of_match_table = npcm_edac_of_match,
+	},
+	.probe = edac_probe,
+	.remove = edac_remove,
+};
+
+module_platform_driver(npcm_edac_driver);
+
+MODULE_AUTHOR("Medad CChien <medadyoung@gmail.com>");
+MODULE_AUTHOR("Marvin Lin <kflin@nuvoton.com>");
+MODULE_DESCRIPTION("Nuvoton NPCM EDAC Driver");
+MODULE_LICENSE("GPL v2");
-- 
2.17.1