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

 /* Copyright (c) 2016-2017, The Linux Foundation. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 and
  * only version 2 as published by the Free Software Foundation.
  *
  * This program is distributed in the hope that 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.
  */

 #include <linux/kernel.h>
 #include <linux/edac.h>
 #include <linux/of_device.h>
 #include <linux/platform_device.h>
 #include <linux/smp.h>
 #include <linux/spinlock.h>
 #include <linux/mfd/syscon.h>
 #include <linux/regmap.h>
 #include <linux/interrupt.h>
 #include "edac_core.h"

 #ifdef CONFIG_EDAC_QCOM_LLCC_PANIC_ON_CE
 #define LLCC_ERP_PANIC_ON_CE 1
 #else
 #define LLCC_ERP_PANIC_ON_CE 0
 #endif

 #ifdef CONFIG_EDAC_QCOM_LLCC_PANIC_ON_UE
 #define LLCC_ERP_PANIC_ON_UE 1
 #else
 #define LLCC_ERP_PANIC_ON_UE 0
 #endif

 #define EDAC_LLCC	"qcom_llcc"

 #define TRP_SYN_REG_CNT	6

 #define DRP_SYN_REG_CNT	8

 #define LLCC_COMMON_STATUS0		0x0003000C
 #define LLCC_LB_CNT_MASK		0xf0000000
 #define LLCC_LB_CNT_SHIFT		28

 /* single & Double Bit syndrome register offsets */
 #define TRP_ECC_SB_ERR_SYN0		0x0002304C
 #define TRP_ECC_DB_ERR_SYN0		0x00020370
 #define DRP_ECC_SB_ERR_SYN0		0x0004204C
 #define DRP_ECC_DB_ERR_SYN0		0x00042070

 /* Error register offsets */
 #define TRP_ECC_ERROR_STATUS1		0x00020348
 #define TRP_ECC_ERROR_STATUS0		0x00020344
 #define DRP_ECC_ERROR_STATUS1		0x00042048
 #define DRP_ECC_ERROR_STATUS0		0x00042044

 /* TRP, DRP interrupt register offsets */
 #define DRP_INTERRUPT_STATUS		0x00041000
 #define TRP_INTERRUPT_0_STATUS		0x00020480
 #define DRP_INTERRUPT_CLEAR		0x00041008
 #define DRP_ECC_ERROR_CNTR_CLEAR	0x00040004
 #define TRP_INTERRUPT_0_CLEAR		0x00020484
 #define TRP_ECC_ERROR_CNTR_CLEAR	0x00020440

 /* Mask and shift macros */
 #define ECC_DB_ERR_COUNT_MASK	0x0000001f
 #define ECC_DB_ERR_WAYS_MASK	0xffff0000
 #define ECC_DB_ERR_WAYS_SHIFT	16

 #define ECC_SB_ERR_COUNT_MASK	0x00ff0000
 #define ECC_SB_ERR_COUNT_SHIFT	16
 #define ECC_SB_ERR_WAYS_MASK	0x0000ffff

 #define SB_ECC_ERROR	0x1
 #define DB_ECC_ERROR	0x2

 #define DRP_TRP_INT_CLEAR	0x3
 #define DRP_TRP_CNT_CLEAR	0x3

 #ifdef CONFIG_EDAC_LLCC_POLL
 static int poll_msec = 5000;
 module_param(poll_msec, int, 0444);
 #endif

 static int interrupt_mode = 1;
 module_param(interrupt_mode, int, 0444);
 MODULE_PARM_DESC(interrupt_mode,
 		 "Controls whether to use interrupt or poll mode");

 enum {
 	LLCC_DRAM_CE = 0,
 	LLCC_DRAM_UE,
 	LLCC_TRAM_CE,
 	LLCC_TRAM_UE,
 };

 struct errors_edac {
 	const char *msg;
 	void (*func)(struct edac_device_ctl_info *edev_ctl,
 				int inst_nr, int block_nr, const char *msg);
 };

 struct erp_drvdata {
 	struct regmap *llcc_map;
 	u32 *llcc_banks;
 	u32 ecc_irq;
 	u32 num_banks;
 	u32 b_off;
 };

 static const struct errors_edac errors[] = {
 	{"LLCC Data RAM correctable Error", edac_device_handle_ce},
 	{"LLCC Data RAM uncorrectable Error", edac_device_handle_ue},
 	{"LLCC Tag RAM correctable Error", edac_device_handle_ce},
 	{"LLCC Tag RAM uncorrectable Error", edac_device_handle_ue},
 };

 /* Clear the error interrupt and counter registers */
 static void qcom_llcc_clear_errors(int err_type, struct erp_drvdata *drv)
 {
 	switch (err_type) {
 	case LLCC_DRAM_CE:
 	case LLCC_DRAM_UE:
 		/* Clear the interrupt */
 		regmap_write(drv->llcc_map, drv->b_off + DRP_INTERRUPT_CLEAR,
 			DRP_TRP_INT_CLEAR);
 		/* Clear the counters */
 		regmap_write(drv->llcc_map,
 			drv->b_off + DRP_ECC_ERROR_CNTR_CLEAR,
 			DRP_TRP_CNT_CLEAR);
 		break;
 	case LLCC_TRAM_CE:
 	case LLCC_TRAM_UE:
 		regmap_write(drv->llcc_map, drv->b_off + TRP_INTERRUPT_0_CLEAR,
 			     DRP_TRP_INT_CLEAR);
 		regmap_write(drv->llcc_map,
 			drv->b_off + TRP_ECC_ERROR_CNTR_CLEAR,
 			DRP_TRP_CNT_CLEAR);
 		break;
 	}
 }

 /* Dump syndrome registers for tag Ram Double bit errors */
 static void dump_trp_db_syn_reg(struct erp_drvdata *drv, u32 bank)
 {
 	int i;
 	int db_err_cnt;
 	int db_err_ways;
 	u32 synd_reg;
 	u32 synd_val;

 	for (i = 0; i < TRP_SYN_REG_CNT; i++) {
 		synd_reg = TRP_ECC_DB_ERR_SYN0 + (i * 4);
 		regmap_read(drv->llcc_map, drv->llcc_banks[bank] + synd_reg,
 			&synd_val);
 		edac_printk(KERN_CRIT, EDAC_LLCC, "TRP_ECC_SYN%d: 0x%8x\n",
 			i, synd_val);
 	}

 	regmap_read(drv->llcc_map,
 		drv->llcc_banks[bank] + TRP_ECC_ERROR_STATUS1, &db_err_cnt);
 	db_err_cnt = (db_err_cnt & ECC_DB_ERR_COUNT_MASK);
 	edac_printk(KERN_CRIT, EDAC_LLCC, "Double-Bit error count: 0x%4x\n",
 		db_err_cnt);

 	regmap_read(drv->llcc_map,
 		drv->llcc_banks[bank] + TRP_ECC_ERROR_STATUS0, &db_err_ways);
 	db_err_ways = (db_err_ways & ECC_DB_ERR_WAYS_MASK);
 	db_err_ways >>= ECC_DB_ERR_WAYS_SHIFT;

 	edac_printk(KERN_CRIT, EDAC_LLCC, "Double-Bit error ways: 0x%4x\n",
 		db_err_ways);
 }

 /* Dump syndrome register for tag Ram Single Bit Errors */
 static void dump_trp_sb_syn_reg(struct erp_drvdata *drv, u32 bank)
 {
 	int i;
 	int sb_err_cnt;
 	int sb_err_ways;
 	u32 synd_reg;
 	u32 synd_val;

 	for (i = 0; i < TRP_SYN_REG_CNT; i++) {
 		synd_reg = TRP_ECC_SB_ERR_SYN0 + (i * 4);
 		regmap_read(drv->llcc_map, drv->llcc_banks[bank] + synd_reg,
 			&synd_val);
 		edac_printk(KERN_CRIT, EDAC_LLCC, "TRP_ECC_SYN%d: 0x%8x\n",
 			i, synd_val);
 	}

 	regmap_read(drv->llcc_map,
 		drv->llcc_banks[bank] + TRP_ECC_ERROR_STATUS1, &sb_err_cnt);
 	sb_err_cnt = (sb_err_cnt & ECC_SB_ERR_COUNT_MASK);
 	sb_err_cnt >>= ECC_SB_ERR_COUNT_SHIFT;
 	edac_printk(KERN_CRIT, EDAC_LLCC, "Single-Bit error count: 0x%4x\n",
 		sb_err_cnt);

 	regmap_read(drv->llcc_map,
 		drv->llcc_banks[bank] + TRP_ECC_ERROR_STATUS0, &sb_err_ways);
 	sb_err_ways = sb_err_ways & ECC_SB_ERR_WAYS_MASK;

 	edac_printk(KERN_CRIT, EDAC_LLCC, "Single-Bit error ways: 0x%4x\n",
 		sb_err_ways);
 }

 /* Dump syndrome registers for Data Ram Double bit errors */
 static void dump_drp_db_syn_reg(struct erp_drvdata *drv, u32 bank)
 {
 	int i;
 	int db_err_cnt;
 	int db_err_ways;
 	u32 synd_reg;
 	u32 synd_val;

 	for (i = 0; i < DRP_SYN_REG_CNT; i++) {
 		synd_reg = DRP_ECC_DB_ERR_SYN0 + (i * 4);
 		regmap_read(drv->llcc_map, drv->llcc_banks[bank] + synd_reg,
 			&synd_val);
 		edac_printk(KERN_CRIT, EDAC_LLCC, "DRP_ECC_SYN%d: 0x%8x\n",
 			i, synd_val);
 	}

 	regmap_read(drv->llcc_map,
 		drv->llcc_banks[bank] + DRP_ECC_ERROR_STATUS1, &db_err_cnt);
 	db_err_cnt = (db_err_cnt & ECC_DB_ERR_COUNT_MASK);
 	edac_printk(KERN_CRIT, EDAC_LLCC, "Double-Bit error count: 0x%4x\n",
 		db_err_cnt);

 	regmap_read(drv->llcc_map,
 		drv->llcc_banks[bank] + DRP_ECC_ERROR_STATUS0, &db_err_ways);
 	db_err_ways &= ECC_DB_ERR_WAYS_MASK;
 	db_err_ways >>= ECC_DB_ERR_WAYS_SHIFT;
 	edac_printk(KERN_CRIT, EDAC_LLCC, "Double-Bit error ways: 0x%4x\n",
 		db_err_ways);
 }

 /* Dump Syndrome registers for Data Ram Single bit errors*/
 static void dump_drp_sb_syn_reg(struct erp_drvdata *drv, u32 bank)
 {
 	int i;
 	int sb_err_cnt;
 	int sb_err_ways;
 	u32 synd_reg;
 	u32 synd_val;

 	for (i = 0; i < DRP_SYN_REG_CNT; i++) {
 		synd_reg = DRP_ECC_SB_ERR_SYN0 + (i * 4);
 		regmap_read(drv->llcc_map, drv->llcc_banks[bank] + synd_reg,
 			&synd_val);
 		edac_printk(KERN_CRIT, EDAC_LLCC, "DRP_ECC_SYN%d: 0x%8x\n",
 			i, synd_val);
 	}

 	regmap_read(drv->llcc_map,
 		drv->llcc_banks[bank] + DRP_ECC_ERROR_STATUS1, &sb_err_cnt);
 	sb_err_cnt &= ECC_SB_ERR_COUNT_MASK;
 	sb_err_cnt >>= ECC_SB_ERR_COUNT_SHIFT;
 	edac_printk(KERN_CRIT, EDAC_LLCC, "Single-Bit error count: 0x%4x\n",
 		sb_err_cnt);

 	regmap_read(drv->llcc_map,
 		drv->llcc_banks[bank] + DRP_ECC_ERROR_STATUS0, &sb_err_ways);
 	sb_err_ways = sb_err_ways & ECC_SB_ERR_WAYS_MASK;

 	edac_printk(KERN_CRIT, EDAC_LLCC, "Single-Bit error ways: 0x%4x\n",
 		sb_err_ways);
 }


 static void dump_syn_reg(struct edac_device_ctl_info *edev_ctl,
 			 int err_type, u32 bank)
 {
 	struct erp_drvdata *drv = edev_ctl->pvt_info;

 	switch (err_type) {
 	case LLCC_DRAM_CE:
 		dump_drp_sb_syn_reg(drv, bank);
 		break;
 	case LLCC_DRAM_UE:
 		dump_drp_db_syn_reg(drv, bank);
 		break;
 	case LLCC_TRAM_CE:
 		dump_trp_sb_syn_reg(drv, bank);
 		break;
 	case LLCC_TRAM_UE:
 		dump_trp_db_syn_reg(drv, bank);
 		break;
 	}

 	qcom_llcc_clear_errors(err_type, drv);

 	errors[err_type].func(edev_ctl, 0, bank, errors[err_type].msg);
 }

 static void qcom_llcc_check_cache_errors
 		(struct edac_device_ctl_info *edev_ctl)
 {
 	u32 drp_error;
 	u32 trp_error;
 	struct erp_drvdata *drv = edev_ctl->pvt_info;
 	u32 i;

 	for (i = 0; i < drv->num_banks; i++) {
 		/* Look for Data RAM errors */
 		regmap_read(drv->llcc_map,
 			drv->llcc_banks[i] + DRP_INTERRUPT_STATUS, &drp_error);

 		if (drp_error & SB_ECC_ERROR) {
 			edac_printk(KERN_CRIT, EDAC_LLCC,
 				"Single Bit Error detected in Data Ram\n");
 			dump_syn_reg(edev_ctl, LLCC_DRAM_CE, i);
 		} else if (drp_error & DB_ECC_ERROR) {
 			edac_printk(KERN_CRIT, EDAC_LLCC,
 				"Double Bit Error detected in Data Ram\n");
 			dump_syn_reg(edev_ctl, LLCC_DRAM_UE, i);
 		}

 		/* Look for Tag RAM errors */
 		regmap_read(drv->llcc_map,
 			drv->llcc_banks[i] + TRP_INTERRUPT_0_STATUS,
 			&trp_error);
 		if (trp_error & SB_ECC_ERROR) {
 			edac_printk(KERN_CRIT, EDAC_LLCC,
 				"Single Bit Error detected in Tag Ram\n");
 			dump_syn_reg(edev_ctl, LLCC_TRAM_CE, i);
 		} else if (trp_error & DB_ECC_ERROR) {
 			edac_printk(KERN_CRIT, EDAC_LLCC,
 				"Double Bit Error detected in Tag Ram\n");
 			dump_syn_reg(edev_ctl, LLCC_TRAM_UE, i);
 		}
 	}
 }

 #ifdef CONFIG_EDAC_LLCC_POLL
 static void qcom_llcc_poll_cache_errors(struct edac_device_ctl_info *edev_ctl)
 {
 	qcom_llcc_check_cache_errors(edev_ctl);
 }
 #endif

 static irqreturn_t llcc_ecc_irq_handler
 			(int irq, void *edev_ctl)
 {
 	qcom_llcc_check_cache_errors(edev_ctl);
 	return IRQ_HANDLED;
 }

 static int qcom_llcc_erp_probe(struct platform_device *pdev)
 {
 	int rc = 0;
 	struct erp_drvdata *drv;
 	struct edac_device_ctl_info *edev_ctl;
 	struct device *dev = &pdev->dev;
 	u32 num_banks;
 	struct regmap *llcc_map = NULL;

 	llcc_map = syscon_node_to_regmap(dev->parent->of_node);
 	if (IS_ERR(llcc_map)) {
 		dev_err(dev, "no regmap for syscon llcc parent\n");
 		return -ENOMEM;
 	}

 	/* Find the number of LLC banks supported */
 	regmap_read(llcc_map, LLCC_COMMON_STATUS0,
 		    &num_banks);

 	num_banks &= LLCC_LB_CNT_MASK;
 	num_banks >>= LLCC_LB_CNT_SHIFT;

 	/* Allocate edac control info */
 	edev_ctl = edac_device_alloc_ctl_info(sizeof(*drv), "qcom-llcc", 1,
 			"bank", num_banks, 1, NULL, 0,
 			edac_device_alloc_index());

 	if (!edev_ctl)
 		return -ENOMEM;

 	edev_ctl->dev = dev;
 	edev_ctl->mod_name = dev_name(dev);
 	edev_ctl->dev_name = dev_name(dev);
 	edev_ctl->ctl_name = "llcc";
 #ifdef CONFIG_EDAC_LLCC_POLL
 	edev_ctl->poll_msec = poll_msec;
 	edev_ctl->edac_check = qcom_llcc_poll_cache_errors;
 	edev_ctl->defer_work = 1;
 #endif
 	edev_ctl->panic_on_ce = LLCC_ERP_PANIC_ON_CE;
 	edev_ctl->panic_on_ue = LLCC_ERP_PANIC_ON_UE;

 	drv = edev_ctl->pvt_info;
 	drv->num_banks = num_banks;
 	drv->llcc_map = llcc_map;

 	rc = edac_device_add_device(edev_ctl);
 	if (rc)
 		goto out_mem;

 	if (interrupt_mode) {
 		drv->ecc_irq = platform_get_irq_byname(pdev, "ecc_irq");
 		if (!drv->ecc_irq) {
 			rc = -ENODEV;
 			goto out_dev;
 		}

 		rc = devm_request_irq(dev, drv->ecc_irq, llcc_ecc_irq_handler,
 				IRQF_TRIGGER_HIGH, "llcc_ecc", edev_ctl);
 		if (rc) {
 			dev_err(dev, "failed to request ecc irq\n");
 			goto out_dev;
 		}
 	}

 	drv->llcc_banks = devm_kzalloc(&pdev->dev,
 		sizeof(u32) * drv->num_banks, GFP_KERNEL);

 	if (!drv->llcc_banks) {
 		dev_err(dev, "Cannot allocate memory for llcc_banks\n");
 		rc = -ENOMEM;
 		goto out_dev;
 	}

 	rc = of_property_read_u32_array(dev->parent->of_node,
 			"qcom,llcc-banks-off", drv->llcc_banks, drv->num_banks);
 	if (rc) {
 		dev_err(dev, "Cannot read llcc-banks-off property\n");
 		goto out_dev;
 	}

 	rc = of_property_read_u32(dev->parent->of_node,
 			"qcom,llcc-broadcast-off", &drv->b_off);
 	if (rc) {
 		dev_err(dev, "Cannot read llcc-broadcast-off property\n");
 		goto out_dev;
 	}

 	platform_set_drvdata(pdev, edev_ctl);

 	return 0;

 out_dev:
 	edac_device_del_device(edev_ctl->dev);
 out_mem:
 	edac_device_free_ctl_info(edev_ctl);

 	return rc;
 }

 static int qcom_llcc_erp_remove(struct platform_device *pdev)
 {
 	struct edac_device_ctl_info *edev_ctl = dev_get_drvdata(&pdev->dev);

 	edac_device_del_device(edev_ctl->dev);
 	edac_device_free_ctl_info(edev_ctl);

 	return 0;
 }

 static const struct of_device_id qcom_llcc_erp_match_table[] = {
 	{ .compatible = "qcom,llcc-erp" },
 	{ },
 };

 static struct platform_driver qcom_llcc_erp_driver = {
 	.probe = qcom_llcc_erp_probe,
 	.remove = qcom_llcc_erp_remove,
 	.driver = {
 		.name = "qcom_llcc_erp",
 		.owner = THIS_MODULE,
 		.of_match_table = qcom_llcc_erp_match_table,
 	},
 };

 static int __init qcom_llcc_erp_init(void)
 {
 	return platform_driver_register(&qcom_llcc_erp_driver);
 }
 module_init(qcom_llcc_erp_init);

 static void __exit qcom_llcc_erp_exit(void)
 {
 	platform_driver_unregister(&qcom_llcc_erp_driver);
 }
 module_exit(qcom_llcc_erp_exit);

 MODULE_DESCRIPTION("QCOM LLCC Error Reporting");
 MODULE_LICENSE("GPL v2");
	/* Copyright (c) 2016-2017, The Linux Foundation. All rights reserved.
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 and
	* only version 2 as published by the Free Software Foundation.
	*
	* This program is distributed in the hope that 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.
	*/

	#include <linux/kernel.h>
	#include <linux/edac.h>
	#include <linux/of_device.h>
	#include <linux/platform_device.h>
	#include <linux/smp.h>
	#include <linux/spinlock.h>
	#include <linux/mfd/syscon.h>
	#include <linux/regmap.h>
	#include <linux/interrupt.h>
	#include "edac_core.h"

	#ifdef CONFIG_EDAC_QCOM_LLCC_PANIC_ON_CE
	#define LLCC_ERP_PANIC_ON_CE 1
	#else
	#define LLCC_ERP_PANIC_ON_CE 0
	#endif

	#ifdef CONFIG_EDAC_QCOM_LLCC_PANIC_ON_UE
	#define LLCC_ERP_PANIC_ON_UE 1
	#else
	#define LLCC_ERP_PANIC_ON_UE 0
	#endif

	#define EDAC_LLCC "qcom_llcc"

	#define TRP_SYN_REG_CNT 6

	#define DRP_SYN_REG_CNT 8

	#define LLCC_COMMON_STATUS0 0x0003000C
	#define LLCC_LB_CNT_MASK 0xf0000000
	#define LLCC_LB_CNT_SHIFT 28

	/* single & Double Bit syndrome register offsets */
	#define TRP_ECC_SB_ERR_SYN0 0x0002304C
	#define TRP_ECC_DB_ERR_SYN0 0x00020370
	#define DRP_ECC_SB_ERR_SYN0 0x0004204C
	#define DRP_ECC_DB_ERR_SYN0 0x00042070

	/* Error register offsets */
	#define TRP_ECC_ERROR_STATUS1 0x00020348
	#define TRP_ECC_ERROR_STATUS0 0x00020344
	#define DRP_ECC_ERROR_STATUS1 0x00042048
	#define DRP_ECC_ERROR_STATUS0 0x00042044

	/* TRP, DRP interrupt register offsets */
	#define DRP_INTERRUPT_STATUS 0x00041000
	#define TRP_INTERRUPT_0_STATUS 0x00020480
	#define DRP_INTERRUPT_CLEAR 0x00041008
	#define DRP_ECC_ERROR_CNTR_CLEAR 0x00040004
	#define TRP_INTERRUPT_0_CLEAR 0x00020484
	#define TRP_ECC_ERROR_CNTR_CLEAR 0x00020440

	/* Mask and shift macros */
	#define ECC_DB_ERR_COUNT_MASK 0x0000001f
	#define ECC_DB_ERR_WAYS_MASK 0xffff0000
	#define ECC_DB_ERR_WAYS_SHIFT 16

	#define ECC_SB_ERR_COUNT_MASK 0x00ff0000
	#define ECC_SB_ERR_COUNT_SHIFT 16
	#define ECC_SB_ERR_WAYS_MASK 0x0000ffff

	#define SB_ECC_ERROR 0x1
	#define DB_ECC_ERROR 0x2

	#define DRP_TRP_INT_CLEAR 0x3
	#define DRP_TRP_CNT_CLEAR 0x3

	#ifdef CONFIG_EDAC_LLCC_POLL
	static int poll_msec = 5000;
	module_param(poll_msec, int, 0444);
	#endif

	static int interrupt_mode = 1;
	module_param(interrupt_mode, int, 0444);
	MODULE_PARM_DESC(interrupt_mode,
	"Controls whether to use interrupt or poll mode");

	enum {
	LLCC_DRAM_CE = 0,
	LLCC_DRAM_UE,
	LLCC_TRAM_CE,
	LLCC_TRAM_UE,
	};

	struct errors_edac {
	const char *msg;
	void (func)(struct edac_device_ctl_info edev_ctl,
	int inst_nr, int block_nr, const char *msg);
	};

	struct erp_drvdata {
	struct regmap *llcc_map;
	u32 *llcc_banks;
	u32 ecc_irq;
	u32 num_banks;
	u32 b_off;
	};

	static const struct errors_edac errors[] = {
	{"LLCC Data RAM correctable Error", edac_device_handle_ce},
	{"LLCC Data RAM uncorrectable Error", edac_device_handle_ue},
	{"LLCC Tag RAM correctable Error", edac_device_handle_ce},
	{"LLCC Tag RAM uncorrectable Error", edac_device_handle_ue},
	};

	/* Clear the error interrupt and counter registers */
	static void qcom_llcc_clear_errors(int err_type, struct erp_drvdata *drv)
	{
	switch (err_type) {
	case LLCC_DRAM_CE:
	case LLCC_DRAM_UE:
	/* Clear the interrupt */
	regmap_write(drv->llcc_map, drv->b_off + DRP_INTERRUPT_CLEAR,
	DRP_TRP_INT_CLEAR);
	/* Clear the counters */
	regmap_write(drv->llcc_map,
	drv->b_off + DRP_ECC_ERROR_CNTR_CLEAR,
	DRP_TRP_CNT_CLEAR);
	break;
	case LLCC_TRAM_CE:
	case LLCC_TRAM_UE:
	regmap_write(drv->llcc_map, drv->b_off + TRP_INTERRUPT_0_CLEAR,
	DRP_TRP_INT_CLEAR);
	regmap_write(drv->llcc_map,
	drv->b_off + TRP_ECC_ERROR_CNTR_CLEAR,
	DRP_TRP_CNT_CLEAR);
	break;
	}
	}

	/* Dump syndrome registers for tag Ram Double bit errors */
	static void dump_trp_db_syn_reg(struct erp_drvdata *drv, u32 bank)
	{
	int i;
	int db_err_cnt;
	int db_err_ways;
	u32 synd_reg;
	u32 synd_val;

	for (i = 0; i < TRP_SYN_REG_CNT; i++) {
	synd_reg = TRP_ECC_DB_ERR_SYN0 + (i * 4);
	regmap_read(drv->llcc_map, drv->llcc_banks[bank] + synd_reg,
	&synd_val);
	edac_printk(KERN_CRIT, EDAC_LLCC, "TRP_ECC_SYN%d: 0x%8x\n",
	i, synd_val);
	}

	regmap_read(drv->llcc_map,
	drv->llcc_banks[bank] + TRP_ECC_ERROR_STATUS1, &db_err_cnt);
	db_err_cnt = (db_err_cnt & ECC_DB_ERR_COUNT_MASK);
	edac_printk(KERN_CRIT, EDAC_LLCC, "Double-Bit error count: 0x%4x\n",
	db_err_cnt);

	regmap_read(drv->llcc_map,
	drv->llcc_banks[bank] + TRP_ECC_ERROR_STATUS0, &db_err_ways);
	db_err_ways = (db_err_ways & ECC_DB_ERR_WAYS_MASK);
	db_err_ways >>= ECC_DB_ERR_WAYS_SHIFT;

	edac_printk(KERN_CRIT, EDAC_LLCC, "Double-Bit error ways: 0x%4x\n",
	db_err_ways);
	}

	/* Dump syndrome register for tag Ram Single Bit Errors */
	static void dump_trp_sb_syn_reg(struct erp_drvdata *drv, u32 bank)
	{
	int i;
	int sb_err_cnt;
	int sb_err_ways;
	u32 synd_reg;
	u32 synd_val;

	for (i = 0; i < TRP_SYN_REG_CNT; i++) {
	synd_reg = TRP_ECC_SB_ERR_SYN0 + (i * 4);
	regmap_read(drv->llcc_map, drv->llcc_banks[bank] + synd_reg,
	&synd_val);
	edac_printk(KERN_CRIT, EDAC_LLCC, "TRP_ECC_SYN%d: 0x%8x\n",
	i, synd_val);
	}

	regmap_read(drv->llcc_map,
	drv->llcc_banks[bank] + TRP_ECC_ERROR_STATUS1, &sb_err_cnt);
	sb_err_cnt = (sb_err_cnt & ECC_SB_ERR_COUNT_MASK);
	sb_err_cnt >>= ECC_SB_ERR_COUNT_SHIFT;
	edac_printk(KERN_CRIT, EDAC_LLCC, "Single-Bit error count: 0x%4x\n",
	sb_err_cnt);

	regmap_read(drv->llcc_map,
	drv->llcc_banks[bank] + TRP_ECC_ERROR_STATUS0, &sb_err_ways);
	sb_err_ways = sb_err_ways & ECC_SB_ERR_WAYS_MASK;

	edac_printk(KERN_CRIT, EDAC_LLCC, "Single-Bit error ways: 0x%4x\n",
	sb_err_ways);
	}

	/* Dump syndrome registers for Data Ram Double bit errors */
	static void dump_drp_db_syn_reg(struct erp_drvdata *drv, u32 bank)
	{
	int i;
	int db_err_cnt;
	int db_err_ways;
	u32 synd_reg;
	u32 synd_val;

	for (i = 0; i < DRP_SYN_REG_CNT; i++) {
	synd_reg = DRP_ECC_DB_ERR_SYN0 + (i * 4);
	regmap_read(drv->llcc_map, drv->llcc_banks[bank] + synd_reg,
	&synd_val);
	edac_printk(KERN_CRIT, EDAC_LLCC, "DRP_ECC_SYN%d: 0x%8x\n",
	i, synd_val);
	}

	regmap_read(drv->llcc_map,
	drv->llcc_banks[bank] + DRP_ECC_ERROR_STATUS1, &db_err_cnt);
	db_err_cnt = (db_err_cnt & ECC_DB_ERR_COUNT_MASK);
	edac_printk(KERN_CRIT, EDAC_LLCC, "Double-Bit error count: 0x%4x\n",
	db_err_cnt);

	regmap_read(drv->llcc_map,
	drv->llcc_banks[bank] + DRP_ECC_ERROR_STATUS0, &db_err_ways);
	db_err_ways &= ECC_DB_ERR_WAYS_MASK;
	db_err_ways >>= ECC_DB_ERR_WAYS_SHIFT;
	edac_printk(KERN_CRIT, EDAC_LLCC, "Double-Bit error ways: 0x%4x\n",
	db_err_ways);
	}

	/* Dump Syndrome registers for Data Ram Single bit errors*/
	static void dump_drp_sb_syn_reg(struct erp_drvdata *drv, u32 bank)
	{
	int i;
	int sb_err_cnt;
	int sb_err_ways;
	u32 synd_reg;
	u32 synd_val;

	for (i = 0; i < DRP_SYN_REG_CNT; i++) {
	synd_reg = DRP_ECC_SB_ERR_SYN0 + (i * 4);
	regmap_read(drv->llcc_map, drv->llcc_banks[bank] + synd_reg,
	&synd_val);
	edac_printk(KERN_CRIT, EDAC_LLCC, "DRP_ECC_SYN%d: 0x%8x\n",
	i, synd_val);
	}

	regmap_read(drv->llcc_map,
	drv->llcc_banks[bank] + DRP_ECC_ERROR_STATUS1, &sb_err_cnt);
	sb_err_cnt &= ECC_SB_ERR_COUNT_MASK;
	sb_err_cnt >>= ECC_SB_ERR_COUNT_SHIFT;
	edac_printk(KERN_CRIT, EDAC_LLCC, "Single-Bit error count: 0x%4x\n",
	sb_err_cnt);

	regmap_read(drv->llcc_map,
	drv->llcc_banks[bank] + DRP_ECC_ERROR_STATUS0, &sb_err_ways);
	sb_err_ways = sb_err_ways & ECC_SB_ERR_WAYS_MASK;

	edac_printk(KERN_CRIT, EDAC_LLCC, "Single-Bit error ways: 0x%4x\n",
	sb_err_ways);
	}


	static void dump_syn_reg(struct edac_device_ctl_info *edev_ctl,
	int err_type, u32 bank)
	{
	struct erp_drvdata *drv = edev_ctl->pvt_info;

	switch (err_type) {
	case LLCC_DRAM_CE:
	dump_drp_sb_syn_reg(drv, bank);
	break;
	case LLCC_DRAM_UE:
	dump_drp_db_syn_reg(drv, bank);
	break;
	case LLCC_TRAM_CE:
	dump_trp_sb_syn_reg(drv, bank);
	break;
	case LLCC_TRAM_UE:
	dump_trp_db_syn_reg(drv, bank);
	break;
	}

	qcom_llcc_clear_errors(err_type, drv);

	errors[err_type].func(edev_ctl, 0, bank, errors[err_type].msg);
	}

	static void qcom_llcc_check_cache_errors
	(struct edac_device_ctl_info *edev_ctl)
	{
	u32 drp_error;
	u32 trp_error;
	struct erp_drvdata *drv = edev_ctl->pvt_info;
	u32 i;

	for (i = 0; i < drv->num_banks; i++) {
	/* Look for Data RAM errors */
	regmap_read(drv->llcc_map,
	drv->llcc_banks[i] + DRP_INTERRUPT_STATUS, &drp_error);

	if (drp_error & SB_ECC_ERROR) {
	edac_printk(KERN_CRIT, EDAC_LLCC,
	"Single Bit Error detected in Data Ram\n");
	dump_syn_reg(edev_ctl, LLCC_DRAM_CE, i);
	} else if (drp_error & DB_ECC_ERROR) {
	edac_printk(KERN_CRIT, EDAC_LLCC,
	"Double Bit Error detected in Data Ram\n");
	dump_syn_reg(edev_ctl, LLCC_DRAM_UE, i);
	}

	/* Look for Tag RAM errors */
	regmap_read(drv->llcc_map,
	drv->llcc_banks[i] + TRP_INTERRUPT_0_STATUS,
	&trp_error);
	if (trp_error & SB_ECC_ERROR) {
	edac_printk(KERN_CRIT, EDAC_LLCC,
	"Single Bit Error detected in Tag Ram\n");
	dump_syn_reg(edev_ctl, LLCC_TRAM_CE, i);
	} else if (trp_error & DB_ECC_ERROR) {
	edac_printk(KERN_CRIT, EDAC_LLCC,
	"Double Bit Error detected in Tag Ram\n");
	dump_syn_reg(edev_ctl, LLCC_TRAM_UE, i);
	}
	}
	}

	#ifdef CONFIG_EDAC_LLCC_POLL
	static void qcom_llcc_poll_cache_errors(struct edac_device_ctl_info *edev_ctl)
	{
	qcom_llcc_check_cache_errors(edev_ctl);
	}
	#endif

	static irqreturn_t llcc_ecc_irq_handler
	(int irq, void *edev_ctl)
	{
	qcom_llcc_check_cache_errors(edev_ctl);
	return IRQ_HANDLED;
	}

	static int qcom_llcc_erp_probe(struct platform_device *pdev)
	{
	int rc = 0;
	struct erp_drvdata *drv;
	struct edac_device_ctl_info *edev_ctl;
	struct device *dev = &pdev->dev;
	u32 num_banks;
	struct regmap *llcc_map = NULL;

	llcc_map = syscon_node_to_regmap(dev->parent->of_node);
	if (IS_ERR(llcc_map)) {
	dev_err(dev, "no regmap for syscon llcc parent\n");
	return -ENOMEM;
	}

	/* Find the number of LLC banks supported */
	regmap_read(llcc_map, LLCC_COMMON_STATUS0,
	&num_banks);

	num_banks &= LLCC_LB_CNT_MASK;
	num_banks >>= LLCC_LB_CNT_SHIFT;

	/* Allocate edac control info */
	edev_ctl = edac_device_alloc_ctl_info(sizeof(*drv), "qcom-llcc", 1,
	"bank", num_banks, 1, NULL, 0,
	edac_device_alloc_index());

	if (!edev_ctl)
	return -ENOMEM;

	edev_ctl->dev = dev;
	edev_ctl->mod_name = dev_name(dev);
	edev_ctl->dev_name = dev_name(dev);
	edev_ctl->ctl_name = "llcc";
	#ifdef CONFIG_EDAC_LLCC_POLL
	edev_ctl->poll_msec = poll_msec;
	edev_ctl->edac_check = qcom_llcc_poll_cache_errors;
	edev_ctl->defer_work = 1;
	#endif
	edev_ctl->panic_on_ce = LLCC_ERP_PANIC_ON_CE;
	edev_ctl->panic_on_ue = LLCC_ERP_PANIC_ON_UE;

	drv = edev_ctl->pvt_info;
	drv->num_banks = num_banks;
	drv->llcc_map = llcc_map;

	rc = edac_device_add_device(edev_ctl);
	if (rc)
	goto out_mem;

	if (interrupt_mode) {
	drv->ecc_irq = platform_get_irq_byname(pdev, "ecc_irq");
	if (!drv->ecc_irq) {
	rc = -ENODEV;
	goto out_dev;
	}

	rc = devm_request_irq(dev, drv->ecc_irq, llcc_ecc_irq_handler,
	IRQF_TRIGGER_HIGH, "llcc_ecc", edev_ctl);
	if (rc) {
	dev_err(dev, "failed to request ecc irq\n");
	goto out_dev;
	}
	}

	drv->llcc_banks = devm_kzalloc(&pdev->dev,
	sizeof(u32) * drv->num_banks, GFP_KERNEL);

	if (!drv->llcc_banks) {
	dev_err(dev, "Cannot allocate memory for llcc_banks\n");
	rc = -ENOMEM;
	goto out_dev;
	}

	rc = of_property_read_u32_array(dev->parent->of_node,
	"qcom,llcc-banks-off", drv->llcc_banks, drv->num_banks);
	if (rc) {
	dev_err(dev, "Cannot read llcc-banks-off property\n");
	goto out_dev;
	}

	rc = of_property_read_u32(dev->parent->of_node,
	"qcom,llcc-broadcast-off", &drv->b_off);
	if (rc) {
	dev_err(dev, "Cannot read llcc-broadcast-off property\n");
	goto out_dev;
	}

	platform_set_drvdata(pdev, edev_ctl);

	return 0;

	out_dev:
	edac_device_del_device(edev_ctl->dev);
	out_mem:
	edac_device_free_ctl_info(edev_ctl);

	return rc;
	}

	static int qcom_llcc_erp_remove(struct platform_device *pdev)
	{
	struct edac_device_ctl_info *edev_ctl = dev_get_drvdata(&pdev->dev);

	edac_device_del_device(edev_ctl->dev);
	edac_device_free_ctl_info(edev_ctl);

	return 0;
	}

	static const struct of_device_id qcom_llcc_erp_match_table[] = {
	{ .compatible = "qcom,llcc-erp" },
	{ },
	};

	static struct platform_driver qcom_llcc_erp_driver = {
	.probe = qcom_llcc_erp_probe,
	.remove = qcom_llcc_erp_remove,
	.driver = {
	.name = "qcom_llcc_erp",
	.owner = THIS_MODULE,
	.of_match_table = qcom_llcc_erp_match_table,
	},
	};

	static int __init qcom_llcc_erp_init(void)
	{
	return platform_driver_register(&qcom_llcc_erp_driver);
	}
	module_init(qcom_llcc_erp_init);

	static void __exit qcom_llcc_erp_exit(void)
	{
	platform_driver_unregister(&qcom_llcc_erp_driver);
	}
	module_exit(qcom_llcc_erp_exit);

	MODULE_DESCRIPTION("QCOM LLCC Error Reporting");
	MODULE_LICENSE("GPL v2");