drivers/edac/highbank_mc_edac.c - kernel/msm-4.9 - Gitiles

 /*
  * Copyright 2011-2012 Calxeda, Inc.
  *
  * 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/types.h>
 #include <linux/kernel.h>
 #include <linux/ctype.h>
 #include <linux/edac.h>
 #include <linux/interrupt.h>
 #include <linux/platform_device.h>
 #include <linux/of_platform.h>
 #include <linux/uaccess.h>

 #include "edac_core.h"
 #include "edac_module.h"

 /* DDR Ctrlr Error Registers */
 #define HB_DDR_ECC_OPT			0x128
 #define HB_DDR_ECC_U_ERR_ADDR		0x130
 #define HB_DDR_ECC_U_ERR_STAT		0x134
 #define HB_DDR_ECC_U_ERR_DATAL		0x138
 #define HB_DDR_ECC_U_ERR_DATAH		0x13c
 #define HB_DDR_ECC_C_ERR_ADDR		0x140
 #define HB_DDR_ECC_C_ERR_STAT		0x144
 #define HB_DDR_ECC_C_ERR_DATAL		0x148
 #define HB_DDR_ECC_C_ERR_DATAH		0x14c
 #define HB_DDR_ECC_INT_STATUS		0x180
 #define HB_DDR_ECC_INT_ACK		0x184
 #define HB_DDR_ECC_U_ERR_ID		0x424
 #define HB_DDR_ECC_C_ERR_ID		0x428

 #define HB_DDR_ECC_INT_STAT_CE		0x8
 #define HB_DDR_ECC_INT_STAT_DOUBLE_CE	0x10
 #define HB_DDR_ECC_INT_STAT_UE		0x20
 #define HB_DDR_ECC_INT_STAT_DOUBLE_UE	0x40

 #define HB_DDR_ECC_OPT_MODE_MASK	0x3
 #define HB_DDR_ECC_OPT_FWC		0x100
 #define HB_DDR_ECC_OPT_XOR_SHIFT	16

 struct hb_mc_drvdata {
 	void __iomem *mc_vbase;
 };

 static irqreturn_t highbank_mc_err_handler(int irq, void *dev_id)
 {
 	struct mem_ctl_info *mci = dev_id;
 	struct hb_mc_drvdata *drvdata = mci->pvt_info;
 	u32 status, err_addr;

 	/* Read the interrupt status register */
 	status = readl(drvdata->mc_vbase + HB_DDR_ECC_INT_STATUS);

 	if (status & HB_DDR_ECC_INT_STAT_UE) {
 		err_addr = readl(drvdata->mc_vbase + HB_DDR_ECC_U_ERR_ADDR);
 		edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1,
 				     err_addr >> PAGE_SHIFT,
 				     err_addr & ~PAGE_MASK, 0,
 				     0, 0, -1,
 				     mci->ctl_name, "");
 	}
 	if (status & HB_DDR_ECC_INT_STAT_CE) {
 		u32 syndrome = readl(drvdata->mc_vbase + HB_DDR_ECC_C_ERR_STAT);
 		syndrome = (syndrome >> 8) & 0xff;
 		err_addr = readl(drvdata->mc_vbase + HB_DDR_ECC_C_ERR_ADDR);
 		edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci, 1,
 				     err_addr >> PAGE_SHIFT,
 				     err_addr & ~PAGE_MASK, syndrome,
 				     0, 0, -1,
 				     mci->ctl_name, "");
 	}

 	/* clear the error, clears the interrupt */
 	writel(status, drvdata->mc_vbase + HB_DDR_ECC_INT_ACK);
 	return IRQ_HANDLED;
 }

 #ifdef CONFIG_EDAC_DEBUG
 static ssize_t highbank_mc_err_inject_write(struct file *file,
 				      const char __user *data,
 				      size_t count, loff_t *ppos)
 {
 	struct mem_ctl_info *mci = file->private_data;
 	struct hb_mc_drvdata *pdata = mci->pvt_info;
 	char buf[32];
 	size_t buf_size;
 	u32 reg;
 	u8 synd;

 	buf_size = min(count, (sizeof(buf)-1));
 	if (copy_from_user(buf, data, buf_size))
 		return -EFAULT;
 	buf[buf_size] = 0;

 	if (!kstrtou8(buf, 16, &synd)) {
 		reg = readl(pdata->mc_vbase + HB_DDR_ECC_OPT);
 		reg &= HB_DDR_ECC_OPT_MODE_MASK;
 		reg |= (synd << HB_DDR_ECC_OPT_XOR_SHIFT) | HB_DDR_ECC_OPT_FWC;
 		writel(reg, pdata->mc_vbase + HB_DDR_ECC_OPT);
 	}

 	return count;
 }

 static const struct file_operations highbank_mc_debug_inject_fops = {
 	.open = simple_open,
 	.write = highbank_mc_err_inject_write,
 	.llseek = generic_file_llseek,
 };

 static void highbank_mc_create_debugfs_nodes(struct mem_ctl_info *mci)
 {
 	if (mci->debugfs)
 		debugfs_create_file("inject_ctrl", S_IWUSR, mci->debugfs, mci,
 				    &highbank_mc_debug_inject_fops);
 ;
 }
 #else
 static void highbank_mc_create_debugfs_nodes(struct mem_ctl_info *mci)
 {}
 #endif

 static int highbank_mc_probe(struct platform_device *pdev)
 {
 	struct edac_mc_layer layers[2];
 	struct mem_ctl_info *mci;
 	struct hb_mc_drvdata *drvdata;
 	struct dimm_info *dimm;
 	struct resource *r;
 	u32 control;
 	int irq;
 	int res = 0;

 	layers[0].type = EDAC_MC_LAYER_CHIP_SELECT;
 	layers[0].size = 1;
 	layers[0].is_virt_csrow = true;
 	layers[1].type = EDAC_MC_LAYER_CHANNEL;
 	layers[1].size = 1;
 	layers[1].is_virt_csrow = false;
 	mci = edac_mc_alloc(0, ARRAY_SIZE(layers), layers,
 			    sizeof(struct hb_mc_drvdata));
 	if (!mci)
 		return -ENOMEM;

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

 	if (!devres_open_group(&pdev->dev, NULL, GFP_KERNEL))
 		return -ENOMEM;

 	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!r) {
 		dev_err(&pdev->dev, "Unable to get mem resource\n");
 		res = -ENODEV;
 		goto err;
 	}

 	if (!devm_request_mem_region(&pdev->dev, r->start,
 				     resource_size(r), dev_name(&pdev->dev))) {
 		dev_err(&pdev->dev, "Error while requesting mem region\n");
 		res = -EBUSY;
 		goto err;
 	}

 	drvdata->mc_vbase = devm_ioremap(&pdev->dev,
 					  r->start, resource_size(r));
 	if (!drvdata->mc_vbase) {
 		dev_err(&pdev->dev, "Unable to map regs\n");
 		res = -ENOMEM;
 		goto err;
 	}

 	control = readl(drvdata->mc_vbase + HB_DDR_ECC_OPT) & 0x3;
 	if (!control || (control == 0x2)) {
 		dev_err(&pdev->dev, "No ECC present, or ECC disabled\n");
 		res = -ENODEV;
 		goto err;
 	}

 	irq = platform_get_irq(pdev, 0);
 	res = devm_request_irq(&pdev->dev, irq, highbank_mc_err_handler,
 			       0, dev_name(&pdev->dev), mci);
 	if (res < 0) {
 		dev_err(&pdev->dev, "Unable to request irq %d\n", irq);
 		goto err;
 	}

 	mci->mtype_cap = MEM_FLAG_DDR3;
 	mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_SECDED;
 	mci->edac_cap = EDAC_FLAG_SECDED;
 	mci->mod_name = dev_name(&pdev->dev);
 	mci->mod_ver = "1";
 	mci->ctl_name = dev_name(&pdev->dev);
 	mci->scrub_mode = SCRUB_SW_SRC;

 	/* Only a single 4GB DIMM is supported */
 	dimm = *mci->dimms;
 	dimm->nr_pages = (~0UL >> PAGE_SHIFT) + 1;
 	dimm->grain = 8;
 	dimm->dtype = DEV_X8;
 	dimm->mtype = MEM_DDR3;
 	dimm->edac_mode = EDAC_SECDED;

 	res = edac_mc_add_mc(mci);
 	if (res < 0)
 		goto err;

 	highbank_mc_create_debugfs_nodes(mci);

 	devres_close_group(&pdev->dev, NULL);
 	return 0;
 err:
 	devres_release_group(&pdev->dev, NULL);
 	edac_mc_free(mci);
 	return res;
 }

 static int highbank_mc_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 const struct of_device_id hb_ddr_ctrl_of_match[] = {
 	{ .compatible = "calxeda,hb-ddr-ctrl", },
 	{},
 };
 MODULE_DEVICE_TABLE(of, hb_ddr_ctrl_of_match);

 static struct platform_driver highbank_mc_edac_driver = {
 	.probe = highbank_mc_probe,
 	.remove = highbank_mc_remove,
 	.driver = {
 		.name = "hb_mc_edac",
 		.of_match_table = hb_ddr_ctrl_of_match,
 	},
 };

 module_platform_driver(highbank_mc_edac_driver);

 MODULE_LICENSE("GPL v2");
 MODULE_AUTHOR("Calxeda, Inc.");
 MODULE_DESCRIPTION("EDAC Driver for Calxeda Highbank");
	/*
	* Copyright 2011-2012 Calxeda, Inc.
	*
	* 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/types.h>
	#include <linux/kernel.h>
	#include <linux/ctype.h>
	#include <linux/edac.h>
	#include <linux/interrupt.h>
	#include <linux/platform_device.h>
	#include <linux/of_platform.h>
	#include <linux/uaccess.h>

	#include "edac_core.h"
	#include "edac_module.h"

	/* DDR Ctrlr Error Registers */
	#define HB_DDR_ECC_OPT 0x128
	#define HB_DDR_ECC_U_ERR_ADDR 0x130
	#define HB_DDR_ECC_U_ERR_STAT 0x134
	#define HB_DDR_ECC_U_ERR_DATAL 0x138
	#define HB_DDR_ECC_U_ERR_DATAH 0x13c
	#define HB_DDR_ECC_C_ERR_ADDR 0x140
	#define HB_DDR_ECC_C_ERR_STAT 0x144
	#define HB_DDR_ECC_C_ERR_DATAL 0x148
	#define HB_DDR_ECC_C_ERR_DATAH 0x14c
	#define HB_DDR_ECC_INT_STATUS 0x180
	#define HB_DDR_ECC_INT_ACK 0x184
	#define HB_DDR_ECC_U_ERR_ID 0x424
	#define HB_DDR_ECC_C_ERR_ID 0x428

	#define HB_DDR_ECC_INT_STAT_CE 0x8
	#define HB_DDR_ECC_INT_STAT_DOUBLE_CE 0x10
	#define HB_DDR_ECC_INT_STAT_UE 0x20
	#define HB_DDR_ECC_INT_STAT_DOUBLE_UE 0x40

	#define HB_DDR_ECC_OPT_MODE_MASK 0x3
	#define HB_DDR_ECC_OPT_FWC 0x100
	#define HB_DDR_ECC_OPT_XOR_SHIFT 16

	struct hb_mc_drvdata {
	void __iomem *mc_vbase;
	};

	static irqreturn_t highbank_mc_err_handler(int irq, void *dev_id)
	{
	struct mem_ctl_info *mci = dev_id;
	struct hb_mc_drvdata *drvdata = mci->pvt_info;
	u32 status, err_addr;

	/* Read the interrupt status register */
	status = readl(drvdata->mc_vbase + HB_DDR_ECC_INT_STATUS);

	if (status & HB_DDR_ECC_INT_STAT_UE) {
	err_addr = readl(drvdata->mc_vbase + HB_DDR_ECC_U_ERR_ADDR);
	edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1,
	err_addr >> PAGE_SHIFT,
	err_addr & ~PAGE_MASK, 0,
	0, 0, -1,
	mci->ctl_name, "");
	}
	if (status & HB_DDR_ECC_INT_STAT_CE) {
	u32 syndrome = readl(drvdata->mc_vbase + HB_DDR_ECC_C_ERR_STAT);
	syndrome = (syndrome >> 8) & 0xff;
	err_addr = readl(drvdata->mc_vbase + HB_DDR_ECC_C_ERR_ADDR);
	edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci, 1,
	err_addr >> PAGE_SHIFT,
	err_addr & ~PAGE_MASK, syndrome,
	0, 0, -1,
	mci->ctl_name, "");
	}

	/* clear the error, clears the interrupt */
	writel(status, drvdata->mc_vbase + HB_DDR_ECC_INT_ACK);
	return IRQ_HANDLED;
	}

	#ifdef CONFIG_EDAC_DEBUG
	static ssize_t highbank_mc_err_inject_write(struct file *file,
	const char __user *data,
	size_t count, loff_t *ppos)
	{
	struct mem_ctl_info *mci = file->private_data;
	struct hb_mc_drvdata *pdata = mci->pvt_info;
	char buf[32];
	size_t buf_size;
	u32 reg;
	u8 synd;

	buf_size = min(count, (sizeof(buf)-1));
	if (copy_from_user(buf, data, buf_size))
	return -EFAULT;
	buf[buf_size] = 0;

	if (!kstrtou8(buf, 16, &synd)) {
	reg = readl(pdata->mc_vbase + HB_DDR_ECC_OPT);
	reg &= HB_DDR_ECC_OPT_MODE_MASK;
	reg \|= (synd << HB_DDR_ECC_OPT_XOR_SHIFT) \| HB_DDR_ECC_OPT_FWC;
	writel(reg, pdata->mc_vbase + HB_DDR_ECC_OPT);
	}

	return count;
	}

	static const struct file_operations highbank_mc_debug_inject_fops = {
	.open = simple_open,
	.write = highbank_mc_err_inject_write,
	.llseek = generic_file_llseek,
	};

	static void highbank_mc_create_debugfs_nodes(struct mem_ctl_info *mci)
	{
	if (mci->debugfs)
	debugfs_create_file("inject_ctrl", S_IWUSR, mci->debugfs, mci,
	&highbank_mc_debug_inject_fops);
	;
	}
	#else
	static void highbank_mc_create_debugfs_nodes(struct mem_ctl_info *mci)
	{}
	#endif

	static int highbank_mc_probe(struct platform_device *pdev)
	{
	struct edac_mc_layer layers[2];
	struct mem_ctl_info *mci;
	struct hb_mc_drvdata *drvdata;
	struct dimm_info *dimm;
	struct resource *r;
	u32 control;
	int irq;
	int res = 0;

	layers[0].type = EDAC_MC_LAYER_CHIP_SELECT;
	layers[0].size = 1;
	layers[0].is_virt_csrow = true;
	layers[1].type = EDAC_MC_LAYER_CHANNEL;
	layers[1].size = 1;
	layers[1].is_virt_csrow = false;
	mci = edac_mc_alloc(0, ARRAY_SIZE(layers), layers,
	sizeof(struct hb_mc_drvdata));
	if (!mci)
	return -ENOMEM;

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

	if (!devres_open_group(&pdev->dev, NULL, GFP_KERNEL))
	return -ENOMEM;

	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!r) {
	dev_err(&pdev->dev, "Unable to get mem resource\n");
	res = -ENODEV;
	goto err;
	}

	if (!devm_request_mem_region(&pdev->dev, r->start,
	resource_size(r), dev_name(&pdev->dev))) {
	dev_err(&pdev->dev, "Error while requesting mem region\n");
	res = -EBUSY;
	goto err;
	}

	drvdata->mc_vbase = devm_ioremap(&pdev->dev,
	r->start, resource_size(r));
	if (!drvdata->mc_vbase) {
	dev_err(&pdev->dev, "Unable to map regs\n");
	res = -ENOMEM;
	goto err;
	}

	control = readl(drvdata->mc_vbase + HB_DDR_ECC_OPT) & 0x3;
	if (!control \|\| (control == 0x2)) {
	dev_err(&pdev->dev, "No ECC present, or ECC disabled\n");
	res = -ENODEV;
	goto err;
	}

	irq = platform_get_irq(pdev, 0);
	res = devm_request_irq(&pdev->dev, irq, highbank_mc_err_handler,
	0, dev_name(&pdev->dev), mci);
	if (res < 0) {
	dev_err(&pdev->dev, "Unable to request irq %d\n", irq);
	goto err;
	}

	mci->mtype_cap = MEM_FLAG_DDR3;
	mci->edac_ctl_cap = EDAC_FLAG_NONE \| EDAC_FLAG_SECDED;
	mci->edac_cap = EDAC_FLAG_SECDED;
	mci->mod_name = dev_name(&pdev->dev);
	mci->mod_ver = "1";
	mci->ctl_name = dev_name(&pdev->dev);
	mci->scrub_mode = SCRUB_SW_SRC;

	/* Only a single 4GB DIMM is supported */
	dimm = *mci->dimms;
	dimm->nr_pages = (~0UL >> PAGE_SHIFT) + 1;
	dimm->grain = 8;
	dimm->dtype = DEV_X8;
	dimm->mtype = MEM_DDR3;
	dimm->edac_mode = EDAC_SECDED;

	res = edac_mc_add_mc(mci);
	if (res < 0)
	goto err;

	highbank_mc_create_debugfs_nodes(mci);

	devres_close_group(&pdev->dev, NULL);
	return 0;
	err:
	devres_release_group(&pdev->dev, NULL);
	edac_mc_free(mci);
	return res;
	}

	static int highbank_mc_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 const struct of_device_id hb_ddr_ctrl_of_match[] = {
	{ .compatible = "calxeda,hb-ddr-ctrl", },
	{},
	};
	MODULE_DEVICE_TABLE(of, hb_ddr_ctrl_of_match);

	static struct platform_driver highbank_mc_edac_driver = {
	.probe = highbank_mc_probe,
	.remove = highbank_mc_remove,
	.driver = {
	.name = "hb_mc_edac",
	.of_match_table = hb_ddr_ctrl_of_match,
	},
	};

	module_platform_driver(highbank_mc_edac_driver);

	MODULE_LICENSE("GPL v2");
	MODULE_AUTHOR("Calxeda, Inc.");
	MODULE_DESCRIPTION("EDAC Driver for Calxeda Highbank");