drivers/edac/ti_edac.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (C) 2017 Texas Instruments Incorporated - http://www.ti.com/
  *
  * Texas Instruments DDR3 ECC error correction and detection driver
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms and conditions of the GNU General Public License,
  * version 2, as published by the Free Software Foundation.
  *
  * This program is distributed in the hope it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  * more details.
  *
  * You should have received a copy of the GNU General Public License along with
  * this program.  If not, see <http://www.gnu.org/licenses/>.
  */

 #include <linux/init.h>
 #include <linux/edac.h>
 #include <linux/io.h>
 #include <linux/interrupt.h>
 #include <linux/of_address.h>
 #include <linux/of_device.h>
 #include <linux/module.h>

 #include "edac_module.h"

 /* EMIF controller registers */
 #define EMIF_SDRAM_CONFIG		0x008
 #define EMIF_IRQ_STATUS			0x0ac
 #define EMIF_IRQ_ENABLE_SET		0x0b4
 #define EMIF_ECC_CTRL			0x110
 #define EMIF_1B_ECC_ERR_CNT		0x130
 #define EMIF_1B_ECC_ERR_THRSH		0x134
 #define EMIF_1B_ECC_ERR_ADDR_LOG	0x13c
 #define EMIF_2B_ECC_ERR_ADDR_LOG	0x140

 /* Bit definitions for EMIF_SDRAM_CONFIG */
 #define SDRAM_TYPE_SHIFT		29
 #define SDRAM_TYPE_MASK			GENMASK(31, 29)
 #define SDRAM_TYPE_DDR3			(3 << SDRAM_TYPE_SHIFT)
 #define SDRAM_TYPE_DDR2			(2 << SDRAM_TYPE_SHIFT)
 #define SDRAM_NARROW_MODE_MASK		GENMASK(15, 14)
 #define SDRAM_K2_NARROW_MODE_SHIFT	12
 #define SDRAM_K2_NARROW_MODE_MASK	GENMASK(13, 12)
 #define SDRAM_ROWSIZE_SHIFT		7
 #define SDRAM_ROWSIZE_MASK		GENMASK(9, 7)
 #define SDRAM_IBANK_SHIFT		4
 #define SDRAM_IBANK_MASK		GENMASK(6, 4)
 #define SDRAM_K2_IBANK_SHIFT		5
 #define SDRAM_K2_IBANK_MASK		GENMASK(6, 5)
 #define SDRAM_K2_EBANK_SHIFT		3
 #define SDRAM_K2_EBANK_MASK		BIT(SDRAM_K2_EBANK_SHIFT)
 #define SDRAM_PAGESIZE_SHIFT		0
 #define SDRAM_PAGESIZE_MASK		GENMASK(2, 0)
 #define SDRAM_K2_PAGESIZE_SHIFT		0
 #define SDRAM_K2_PAGESIZE_MASK		GENMASK(1, 0)

 #define EMIF_1B_ECC_ERR_THRSH_SHIFT	24

 /* IRQ bit definitions */
 #define EMIF_1B_ECC_ERR			BIT(5)
 #define EMIF_2B_ECC_ERR			BIT(4)
 #define EMIF_WR_ECC_ERR			BIT(3)
 #define EMIF_SYS_ERR			BIT(0)
 /* Bit 31 enables ECC and 28 enables RMW */
 #define ECC_ENABLED			(BIT(31) | BIT(28))

 #define EDAC_MOD_NAME			"ti-emif-edac"

 enum {
 	EMIF_TYPE_DRA7,
 	EMIF_TYPE_K2
 };

 struct ti_edac {
 	void __iomem *reg;
 };

 static u32 ti_edac_readl(struct ti_edac *edac, u16 offset)
 {
 	return readl_relaxed(edac->reg + offset);
 }

 static void ti_edac_writel(struct ti_edac *edac, u32 val, u16 offset)
 {
 	writel_relaxed(val, edac->reg + offset);
 }

 static irqreturn_t ti_edac_isr(int irq, void *data)
 {
 	struct mem_ctl_info *mci = data;
 	struct ti_edac *edac = mci->pvt_info;
 	u32 irq_status;
 	u32 err_addr;
 	int err_count;

 	irq_status = ti_edac_readl(edac, EMIF_IRQ_STATUS);

 	if (irq_status & EMIF_1B_ECC_ERR) {
 		err_addr = ti_edac_readl(edac, EMIF_1B_ECC_ERR_ADDR_LOG);
 		err_count = ti_edac_readl(edac, EMIF_1B_ECC_ERR_CNT);
 		ti_edac_writel(edac, err_count, EMIF_1B_ECC_ERR_CNT);
 		edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci, err_count,
 				     err_addr >> PAGE_SHIFT,
 				     err_addr & ~PAGE_MASK, -1, 0, 0, 0,
 				     mci->ctl_name, "1B");
 	}

 	if (irq_status & EMIF_2B_ECC_ERR) {
 		err_addr = ti_edac_readl(edac, EMIF_2B_ECC_ERR_ADDR_LOG);
 		edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1,
 				     err_addr >> PAGE_SHIFT,
 				     err_addr & ~PAGE_MASK, -1, 0, 0, 0,
 				     mci->ctl_name, "2B");
 	}

 	if (irq_status & EMIF_WR_ECC_ERR)
 		edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1,
 				     0, 0, -1, 0, 0, 0,
 				     mci->ctl_name, "WR");

 	ti_edac_writel(edac, irq_status, EMIF_IRQ_STATUS);

 	return IRQ_HANDLED;
 }

 static void ti_edac_setup_dimm(struct mem_ctl_info *mci, u32 type)
 {
 	struct dimm_info *dimm;
 	struct ti_edac *edac = mci->pvt_info;
 	int bits;
 	u32 val;
 	u32 memsize;

 	dimm = edac_get_dimm(mci, 0, 0, 0);

 	val = ti_edac_readl(edac, EMIF_SDRAM_CONFIG);

 	if (type == EMIF_TYPE_DRA7) {
 		bits = ((val & SDRAM_PAGESIZE_MASK) >> SDRAM_PAGESIZE_SHIFT) + 8;
 		bits += ((val & SDRAM_ROWSIZE_MASK) >> SDRAM_ROWSIZE_SHIFT) + 9;
 		bits += (val & SDRAM_IBANK_MASK) >> SDRAM_IBANK_SHIFT;

 		if (val & SDRAM_NARROW_MODE_MASK) {
 			bits++;
 			dimm->dtype = DEV_X16;
 		} else {
 			bits += 2;
 			dimm->dtype = DEV_X32;
 		}
 	} else {
 		bits = 16;
 		bits += ((val & SDRAM_K2_PAGESIZE_MASK) >>
 			SDRAM_K2_PAGESIZE_SHIFT) + 8;
 		bits += (val & SDRAM_K2_IBANK_MASK) >> SDRAM_K2_IBANK_SHIFT;
 		bits += (val & SDRAM_K2_EBANK_MASK) >> SDRAM_K2_EBANK_SHIFT;

 		val = (val & SDRAM_K2_NARROW_MODE_MASK) >>
 			SDRAM_K2_NARROW_MODE_SHIFT;
 		switch (val) {
 		case 0:
 			bits += 3;
 			dimm->dtype = DEV_X64;
 			break;
 		case 1:
 			bits += 2;
 			dimm->dtype = DEV_X32;
 			break;
 		case 2:
 			bits++;
 			dimm->dtype = DEV_X16;
 			break;
 		}
 	}

 	memsize = 1 << bits;

 	dimm->nr_pages = memsize >> PAGE_SHIFT;
 	dimm->grain = 4;
 	if ((val & SDRAM_TYPE_MASK) == SDRAM_TYPE_DDR2)
 		dimm->mtype = MEM_DDR2;
 	else
 		dimm->mtype = MEM_DDR3;

 	val = ti_edac_readl(edac, EMIF_ECC_CTRL);
 	if (val & ECC_ENABLED)
 		dimm->edac_mode = EDAC_SECDED;
 	else
 		dimm->edac_mode = EDAC_NONE;
 }

 static const struct of_device_id ti_edac_of_match[] = {
 	{ .compatible = "ti,emif-keystone", .data = (void *)EMIF_TYPE_K2 },
 	{ .compatible = "ti,emif-dra7xx", .data = (void *)EMIF_TYPE_DRA7 },
 	{},
 };

 static int _emif_get_id(struct device_node *node)
 {
 	struct device_node *np;
 	const __be32 *addrp;
 	u32 addr, my_addr;
 	int my_id = 0;

 	addrp = of_get_address(node, 0, NULL, NULL);
 	my_addr = (u32)of_translate_address(node, addrp);

 	for_each_matching_node(np, ti_edac_of_match) {
 		if (np == node)
 			continue;

 		addrp = of_get_address(np, 0, NULL, NULL);
 		addr = (u32)of_translate_address(np, addrp);

 		edac_printk(KERN_INFO, EDAC_MOD_NAME,
 			    "addr=%x, my_addr=%x\n",
 			    addr, my_addr);

 		if (addr < my_addr)
 			my_id++;
 	}

 	return my_id;
 }

 static int ti_edac_probe(struct platform_device *pdev)
 {
 	int error_irq = 0, ret = -ENODEV;
 	struct device *dev = &pdev->dev;
 	struct resource *res;
 	void __iomem *reg;
 	struct mem_ctl_info *mci;
 	struct edac_mc_layer layers[1];
 	const struct of_device_id *id;
 	struct ti_edac *edac;
 	int emif_id;

 	id = of_match_device(ti_edac_of_match, &pdev->dev);
 	if (!id)
 		return -ENODEV;

 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	reg = devm_ioremap_resource(dev, res);
 	if (IS_ERR(reg)) {
 		edac_printk(KERN_ERR, EDAC_MOD_NAME,
 			    "EMIF controller regs not defined\n");
 		return PTR_ERR(reg);
 	}

 	layers[0].type = EDAC_MC_LAYER_ALL_MEM;
 	layers[0].size = 1;

 	/* Allocate ID number for our EMIF controller */
 	emif_id = _emif_get_id(pdev->dev.of_node);
 	if (emif_id < 0)
 		return -EINVAL;

 	mci = edac_mc_alloc(emif_id, 1, layers, sizeof(*edac));
 	if (!mci)
 		return -ENOMEM;

 	mci->pdev = &pdev->dev;
 	edac = mci->pvt_info;
 	edac->reg = reg;
 	platform_set_drvdata(pdev, mci);

 	mci->mtype_cap = MEM_FLAG_DDR3 | MEM_FLAG_DDR2;
 	mci->edac_ctl_cap = EDAC_FLAG_SECDED | EDAC_FLAG_NONE;
 	mci->mod_name = EDAC_MOD_NAME;
 	mci->ctl_name = id->compatible;
 	mci->dev_name = dev_name(&pdev->dev);

 	/* Setup memory layout */
 	ti_edac_setup_dimm(mci, (u32)(id->data));

 	/* add EMIF ECC error handler */
 	error_irq = platform_get_irq(pdev, 0);
 	if (!error_irq) {
 		edac_printk(KERN_ERR, EDAC_MOD_NAME,
 			    "EMIF irq number not defined.\n");
 		goto err;
 	}

 	ret = devm_request_irq(dev, error_irq, ti_edac_isr, 0,
 			       "emif-edac-irq", mci);
 	if (ret) {
 		edac_printk(KERN_ERR, EDAC_MOD_NAME,
 			    "request_irq fail for EMIF EDAC irq\n");
 		goto err;
 	}

 	ret = edac_mc_add_mc(mci);
 	if (ret) {
 		edac_printk(KERN_ERR, EDAC_MOD_NAME,
 			    "Failed to register mci: %d.\n", ret);
 		goto err;
 	}

 	/* Generate an interrupt with each 1b error */
 	ti_edac_writel(edac, 1 << EMIF_1B_ECC_ERR_THRSH_SHIFT,
 		       EMIF_1B_ECC_ERR_THRSH);

 	/* Enable interrupts */
 	ti_edac_writel(edac,
 		       EMIF_1B_ECC_ERR | EMIF_2B_ECC_ERR | EMIF_WR_ECC_ERR,
 		       EMIF_IRQ_ENABLE_SET);

 	return 0;

 err:
 	edac_mc_free(mci);
 	return ret;
 }

 static int ti_edac_remove(struct platform_device *pdev)
 {
 	struct mem_ctl_info *mci = platform_get_drvdata(pdev);

 	edac_mc_del_mc(&pdev->dev);
 	edac_mc_free(mci);

 	return 0;
 }

 static struct platform_driver ti_edac_driver = {
 	.probe = ti_edac_probe,
 	.remove = ti_edac_remove,
 	.driver = {
 		   .name = EDAC_MOD_NAME,
 		   .of_match_table = ti_edac_of_match,
 	},
 };

 module_platform_driver(ti_edac_driver);

 MODULE_AUTHOR("Texas Instruments Inc.");
 MODULE_DESCRIPTION("EDAC Driver for Texas Instruments DDR3 MC");
 MODULE_LICENSE("GPL v2");
	// SPDX-License-Identifier: GPL-2.0
	/*
	* Copyright (C) 2017 Texas Instruments Incorporated - http://www.ti.com/
	*
	* Texas Instruments DDR3 ECC error correction and detection driver
	*
	* This program is free software; you can redistribute it and/or modify it
	* under the terms and conditions of the GNU General Public License,
	* version 2, as published by the Free Software Foundation.
	*
	* This program is distributed in the hope it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	* more details.
	*
	* You should have received a copy of the GNU General Public License along with
	* this program. If not, see <http://www.gnu.org/licenses/>.
	*/

	#include <linux/init.h>
	#include <linux/edac.h>
	#include <linux/io.h>
	#include <linux/interrupt.h>
	#include <linux/of_address.h>
	#include <linux/of_device.h>
	#include <linux/module.h>

	#include "edac_module.h"

	/* EMIF controller registers */
	#define EMIF_SDRAM_CONFIG 0x008
	#define EMIF_IRQ_STATUS 0x0ac
	#define EMIF_IRQ_ENABLE_SET 0x0b4
	#define EMIF_ECC_CTRL 0x110
	#define EMIF_1B_ECC_ERR_CNT 0x130
	#define EMIF_1B_ECC_ERR_THRSH 0x134
	#define EMIF_1B_ECC_ERR_ADDR_LOG 0x13c
	#define EMIF_2B_ECC_ERR_ADDR_LOG 0x140

	/* Bit definitions for EMIF_SDRAM_CONFIG */
	#define SDRAM_TYPE_SHIFT 29
	#define SDRAM_TYPE_MASK GENMASK(31, 29)
	#define SDRAM_TYPE_DDR3 (3 << SDRAM_TYPE_SHIFT)
	#define SDRAM_TYPE_DDR2 (2 << SDRAM_TYPE_SHIFT)
	#define SDRAM_NARROW_MODE_MASK GENMASK(15, 14)
	#define SDRAM_K2_NARROW_MODE_SHIFT 12
	#define SDRAM_K2_NARROW_MODE_MASK GENMASK(13, 12)
	#define SDRAM_ROWSIZE_SHIFT 7
	#define SDRAM_ROWSIZE_MASK GENMASK(9, 7)
	#define SDRAM_IBANK_SHIFT 4
	#define SDRAM_IBANK_MASK GENMASK(6, 4)
	#define SDRAM_K2_IBANK_SHIFT 5
	#define SDRAM_K2_IBANK_MASK GENMASK(6, 5)
	#define SDRAM_K2_EBANK_SHIFT 3
	#define SDRAM_K2_EBANK_MASK BIT(SDRAM_K2_EBANK_SHIFT)
	#define SDRAM_PAGESIZE_SHIFT 0
	#define SDRAM_PAGESIZE_MASK GENMASK(2, 0)
	#define SDRAM_K2_PAGESIZE_SHIFT 0
	#define SDRAM_K2_PAGESIZE_MASK GENMASK(1, 0)

	#define EMIF_1B_ECC_ERR_THRSH_SHIFT 24

	/* IRQ bit definitions */
	#define EMIF_1B_ECC_ERR BIT(5)
	#define EMIF_2B_ECC_ERR BIT(4)
	#define EMIF_WR_ECC_ERR BIT(3)
	#define EMIF_SYS_ERR BIT(0)
	/* Bit 31 enables ECC and 28 enables RMW */
	#define ECC_ENABLED (BIT(31) \| BIT(28))

	#define EDAC_MOD_NAME "ti-emif-edac"

	enum {
	EMIF_TYPE_DRA7,
	EMIF_TYPE_K2
	};

	struct ti_edac {
	void __iomem *reg;
	};

	static u32 ti_edac_readl(struct ti_edac *edac, u16 offset)
	{
	return readl_relaxed(edac->reg + offset);
	}

	static void ti_edac_writel(struct ti_edac *edac, u32 val, u16 offset)
	{
	writel_relaxed(val, edac->reg + offset);
	}

	static irqreturn_t ti_edac_isr(int irq, void *data)
	{
	struct mem_ctl_info *mci = data;
	struct ti_edac *edac = mci->pvt_info;
	u32 irq_status;
	u32 err_addr;
	int err_count;

	irq_status = ti_edac_readl(edac, EMIF_IRQ_STATUS);

	if (irq_status & EMIF_1B_ECC_ERR) {
	err_addr = ti_edac_readl(edac, EMIF_1B_ECC_ERR_ADDR_LOG);
	err_count = ti_edac_readl(edac, EMIF_1B_ECC_ERR_CNT);
	ti_edac_writel(edac, err_count, EMIF_1B_ECC_ERR_CNT);
	edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci, err_count,
	err_addr >> PAGE_SHIFT,
	err_addr & ~PAGE_MASK, -1, 0, 0, 0,
	mci->ctl_name, "1B");
	}

	if (irq_status & EMIF_2B_ECC_ERR) {
	err_addr = ti_edac_readl(edac, EMIF_2B_ECC_ERR_ADDR_LOG);
	edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1,
	err_addr >> PAGE_SHIFT,
	err_addr & ~PAGE_MASK, -1, 0, 0, 0,
	mci->ctl_name, "2B");
	}

	if (irq_status & EMIF_WR_ECC_ERR)
	edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1,
	0, 0, -1, 0, 0, 0,
	mci->ctl_name, "WR");

	ti_edac_writel(edac, irq_status, EMIF_IRQ_STATUS);

	return IRQ_HANDLED;
	}

	static void ti_edac_setup_dimm(struct mem_ctl_info *mci, u32 type)
	{
	struct dimm_info *dimm;
	struct ti_edac *edac = mci->pvt_info;
	int bits;
	u32 val;
	u32 memsize;

	dimm = edac_get_dimm(mci, 0, 0, 0);

	val = ti_edac_readl(edac, EMIF_SDRAM_CONFIG);

	if (type == EMIF_TYPE_DRA7) {
	bits = ((val & SDRAM_PAGESIZE_MASK) >> SDRAM_PAGESIZE_SHIFT) + 8;
	bits += ((val & SDRAM_ROWSIZE_MASK) >> SDRAM_ROWSIZE_SHIFT) + 9;
	bits += (val & SDRAM_IBANK_MASK) >> SDRAM_IBANK_SHIFT;

	if (val & SDRAM_NARROW_MODE_MASK) {
	bits++;
	dimm->dtype = DEV_X16;
	} else {
	bits += 2;
	dimm->dtype = DEV_X32;
	}
	} else {
	bits = 16;
	bits += ((val & SDRAM_K2_PAGESIZE_MASK) >>
	SDRAM_K2_PAGESIZE_SHIFT) + 8;
	bits += (val & SDRAM_K2_IBANK_MASK) >> SDRAM_K2_IBANK_SHIFT;
	bits += (val & SDRAM_K2_EBANK_MASK) >> SDRAM_K2_EBANK_SHIFT;

	val = (val & SDRAM_K2_NARROW_MODE_MASK) >>
	SDRAM_K2_NARROW_MODE_SHIFT;
	switch (val) {
	case 0:
	bits += 3;
	dimm->dtype = DEV_X64;
	break;
	case 1:
	bits += 2;
	dimm->dtype = DEV_X32;
	break;
	case 2:
	bits++;
	dimm->dtype = DEV_X16;
	break;
	}
	}

	memsize = 1 << bits;

	dimm->nr_pages = memsize >> PAGE_SHIFT;
	dimm->grain = 4;
	if ((val & SDRAM_TYPE_MASK) == SDRAM_TYPE_DDR2)
	dimm->mtype = MEM_DDR2;
	else
	dimm->mtype = MEM_DDR3;

	val = ti_edac_readl(edac, EMIF_ECC_CTRL);
	if (val & ECC_ENABLED)
	dimm->edac_mode = EDAC_SECDED;
	else
	dimm->edac_mode = EDAC_NONE;
	}

	static const struct of_device_id ti_edac_of_match[] = {
	{ .compatible = "ti,emif-keystone", .data = (void *)EMIF_TYPE_K2 },
	{ .compatible = "ti,emif-dra7xx", .data = (void *)EMIF_TYPE_DRA7 },
	{},
	};

	static int _emif_get_id(struct device_node *node)
	{
	struct device_node *np;
	const __be32 *addrp;
	u32 addr, my_addr;
	int my_id = 0;

	addrp = of_get_address(node, 0, NULL, NULL);
	my_addr = (u32)of_translate_address(node, addrp);

	for_each_matching_node(np, ti_edac_of_match) {
	if (np == node)
	continue;

	addrp = of_get_address(np, 0, NULL, NULL);
	addr = (u32)of_translate_address(np, addrp);

	edac_printk(KERN_INFO, EDAC_MOD_NAME,
	"addr=%x, my_addr=%x\n",
	addr, my_addr);

	if (addr < my_addr)
	my_id++;
	}

	return my_id;
	}

	static int ti_edac_probe(struct platform_device *pdev)
	{
	int error_irq = 0, ret = -ENODEV;
	struct device *dev = &pdev->dev;
	struct resource *res;
	void __iomem *reg;
	struct mem_ctl_info *mci;
	struct edac_mc_layer layers[1];
	const struct of_device_id *id;
	struct ti_edac *edac;
	int emif_id;

	id = of_match_device(ti_edac_of_match, &pdev->dev);
	if (!id)
	return -ENODEV;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	reg = devm_ioremap_resource(dev, res);
	if (IS_ERR(reg)) {
	edac_printk(KERN_ERR, EDAC_MOD_NAME,
	"EMIF controller regs not defined\n");
	return PTR_ERR(reg);
	}

	layers[0].type = EDAC_MC_LAYER_ALL_MEM;
	layers[0].size = 1;

	/* Allocate ID number for our EMIF controller */
	emif_id = _emif_get_id(pdev->dev.of_node);
	if (emif_id < 0)
	return -EINVAL;

	mci = edac_mc_alloc(emif_id, 1, layers, sizeof(*edac));
	if (!mci)
	return -ENOMEM;

	mci->pdev = &pdev->dev;
	edac = mci->pvt_info;
	edac->reg = reg;
	platform_set_drvdata(pdev, mci);

	mci->mtype_cap = MEM_FLAG_DDR3 \| MEM_FLAG_DDR2;
	mci->edac_ctl_cap = EDAC_FLAG_SECDED \| EDAC_FLAG_NONE;
	mci->mod_name = EDAC_MOD_NAME;
	mci->ctl_name = id->compatible;
	mci->dev_name = dev_name(&pdev->dev);

	/* Setup memory layout */
	ti_edac_setup_dimm(mci, (u32)(id->data));

	/* add EMIF ECC error handler */
	error_irq = platform_get_irq(pdev, 0);
	if (!error_irq) {
	edac_printk(KERN_ERR, EDAC_MOD_NAME,
	"EMIF irq number not defined.\n");
	goto err;
	}

	ret = devm_request_irq(dev, error_irq, ti_edac_isr, 0,
	"emif-edac-irq", mci);
	if (ret) {
	edac_printk(KERN_ERR, EDAC_MOD_NAME,
	"request_irq fail for EMIF EDAC irq\n");
	goto err;
	}

	ret = edac_mc_add_mc(mci);
	if (ret) {
	edac_printk(KERN_ERR, EDAC_MOD_NAME,
	"Failed to register mci: %d.\n", ret);
	goto err;
	}

	/* Generate an interrupt with each 1b error */
	ti_edac_writel(edac, 1 << EMIF_1B_ECC_ERR_THRSH_SHIFT,
	EMIF_1B_ECC_ERR_THRSH);

	/* Enable interrupts */
	ti_edac_writel(edac,
	EMIF_1B_ECC_ERR \| EMIF_2B_ECC_ERR \| EMIF_WR_ECC_ERR,
	EMIF_IRQ_ENABLE_SET);

	return 0;

	err:
	edac_mc_free(mci);
	return ret;
	}

	static int ti_edac_remove(struct platform_device *pdev)
	{
	struct mem_ctl_info *mci = platform_get_drvdata(pdev);

	edac_mc_del_mc(&pdev->dev);
	edac_mc_free(mci);

	return 0;
	}

	static struct platform_driver ti_edac_driver = {
	.probe = ti_edac_probe,
	.remove = ti_edac_remove,
	.driver = {
	.name = EDAC_MOD_NAME,
	.of_match_table = ti_edac_of_match,
	},
	};

	module_platform_driver(ti_edac_driver);

	MODULE_AUTHOR("Texas Instruments Inc.");
	MODULE_DESCRIPTION("EDAC Driver for Texas Instruments DDR3 MC");
	MODULE_LICENSE("GPL v2");