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

 // SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (c) 2018, The Linux Foundation. All rights reserved.
  */

 #include <linux/edac.h>
 #include <linux/interrupt.h>
 #include <linux/kernel.h>
 #include <linux/of.h>
 #include <linux/platform_device.h>
 #include <linux/regmap.h>
 #include <linux/soc/qcom/llcc-qcom.h>

 #include "edac_mc.h"
 #include "edac_device.h"

 #define EDAC_LLCC                       "qcom_llcc"

 #define LLCC_ERP_PANIC_ON_UE            1

 #define TRP_SYN_REG_CNT                 6
 #define DRP_SYN_REG_CNT                 8

 #define LLCC_LB_CNT_MASK                GENMASK(31, 28)
 #define LLCC_LB_CNT_SHIFT               28

 /* Mask and shift macros */
 #define ECC_DB_ERR_COUNT_MASK           GENMASK(4, 0)
 #define ECC_DB_ERR_WAYS_MASK            GENMASK(31, 16)
 #define ECC_DB_ERR_WAYS_SHIFT           BIT(4)

 #define ECC_SB_ERR_COUNT_MASK           GENMASK(23, 16)
 #define ECC_SB_ERR_COUNT_SHIFT          BIT(4)
 #define ECC_SB_ERR_WAYS_MASK            GENMASK(15, 0)

 #define SB_ECC_ERROR                    BIT(0)
 #define DB_ECC_ERROR                    BIT(1)

 #define DRP_TRP_INT_CLEAR               GENMASK(1, 0)
 #define DRP_TRP_CNT_CLEAR               GENMASK(1, 0)

 #define SB_ERROR_THRESHOLD              0x1
 #define SB_ERROR_THRESHOLD_SHIFT        24
 #define SB_DB_TRP_INTERRUPT_ENABLE      0x3
 #define TRP0_INTERRUPT_ENABLE           0x1
 #define DRP0_INTERRUPT_ENABLE           BIT(6)
 #define SB_DB_DRP_INTERRUPT_ENABLE      0x3

 #define ECC_POLL_MSEC			5000

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

 static const struct llcc_edac_reg_data edac_reg_data[] = {
 	[LLCC_DRAM_CE] = {
 		.name = "DRAM Single-bit",
 		.reg_cnt = DRP_SYN_REG_CNT,
 		.count_mask = ECC_SB_ERR_COUNT_MASK,
 		.ways_mask = ECC_SB_ERR_WAYS_MASK,
 		.count_shift = ECC_SB_ERR_COUNT_SHIFT,
 	},
 	[LLCC_DRAM_UE] = {
 		.name = "DRAM Double-bit",
 		.reg_cnt = DRP_SYN_REG_CNT,
 		.count_mask = ECC_DB_ERR_COUNT_MASK,
 		.ways_mask = ECC_DB_ERR_WAYS_MASK,
 		.ways_shift = ECC_DB_ERR_WAYS_SHIFT,
 	},
 	[LLCC_TRAM_CE] = {
 		.name = "TRAM Single-bit",
 		.reg_cnt = TRP_SYN_REG_CNT,
 		.count_mask = ECC_SB_ERR_COUNT_MASK,
 		.ways_mask = ECC_SB_ERR_WAYS_MASK,
 		.count_shift = ECC_SB_ERR_COUNT_SHIFT,
 	},
 	[LLCC_TRAM_UE] = {
 		.name = "TRAM Double-bit",
 		.reg_cnt = TRP_SYN_REG_CNT,
 		.count_mask = ECC_DB_ERR_COUNT_MASK,
 		.ways_mask = ECC_DB_ERR_WAYS_MASK,
 		.ways_shift = ECC_DB_ERR_WAYS_SHIFT,
 	},
 };

 static int qcom_llcc_core_setup(struct llcc_drv_data *drv, struct regmap *llcc_bcast_regmap)
 {
 	u32 sb_err_threshold;
 	int ret;

 	/*
 	 * Configure interrupt enable registers such that Tag, Data RAM related
 	 * interrupts are propagated to interrupt controller for servicing
 	 */
 	ret = regmap_update_bits(llcc_bcast_regmap, drv->edac_reg_offset->cmn_interrupt_2_enable,
 				 TRP0_INTERRUPT_ENABLE,
 				 TRP0_INTERRUPT_ENABLE);
 	if (ret)
 		return ret;

 	ret = regmap_update_bits(llcc_bcast_regmap, drv->edac_reg_offset->trp_interrupt_0_enable,
 				 SB_DB_TRP_INTERRUPT_ENABLE,
 				 SB_DB_TRP_INTERRUPT_ENABLE);
 	if (ret)
 		return ret;

 	sb_err_threshold = (SB_ERROR_THRESHOLD << SB_ERROR_THRESHOLD_SHIFT);
 	ret = regmap_write(llcc_bcast_regmap, drv->edac_reg_offset->drp_ecc_error_cfg,
 			   sb_err_threshold);
 	if (ret)
 		return ret;

 	ret = regmap_update_bits(llcc_bcast_regmap, drv->edac_reg_offset->cmn_interrupt_2_enable,
 				 DRP0_INTERRUPT_ENABLE,
 				 DRP0_INTERRUPT_ENABLE);
 	if (ret)
 		return ret;

 	ret = regmap_write(llcc_bcast_regmap, drv->edac_reg_offset->drp_interrupt_enable,
 			   SB_DB_DRP_INTERRUPT_ENABLE);
 	return ret;
 }

 /* Clear the error interrupt and counter registers */
 static int
 qcom_llcc_clear_error_status(int err_type, struct llcc_drv_data *drv)
 {
 	int ret;

 	switch (err_type) {
 	case LLCC_DRAM_CE:
 	case LLCC_DRAM_UE:
 		ret = regmap_write(drv->bcast_regmap,
 				   drv->edac_reg_offset->drp_interrupt_clear,
 				   DRP_TRP_INT_CLEAR);
 		if (ret)
 			return ret;

 		ret = regmap_write(drv->bcast_regmap,
 				   drv->edac_reg_offset->drp_ecc_error_cntr_clear,
 				   DRP_TRP_CNT_CLEAR);
 		if (ret)
 			return ret;
 		break;
 	case LLCC_TRAM_CE:
 	case LLCC_TRAM_UE:
 		ret = regmap_write(drv->bcast_regmap,
 				   drv->edac_reg_offset->trp_interrupt_0_clear,
 				   DRP_TRP_INT_CLEAR);
 		if (ret)
 			return ret;

 		ret = regmap_write(drv->bcast_regmap,
 				   drv->edac_reg_offset->trp_ecc_error_cntr_clear,
 				   DRP_TRP_CNT_CLEAR);
 		if (ret)
 			return ret;
 		break;
 	default:
 		ret = -EINVAL;
 		edac_printk(KERN_CRIT, EDAC_LLCC, "Unexpected error type: %d\n",
 			    err_type);
 	}
 	return ret;
 }

 struct qcom_llcc_syn_regs {
 	u32 synd_reg;
 	u32 count_status_reg;
 	u32 ways_status_reg;
 };

 static void get_reg_offsets(struct llcc_drv_data *drv, int err_type,
 			    struct qcom_llcc_syn_regs *syn_regs)
 {
 	const struct llcc_edac_reg_offset *edac_reg_offset = drv->edac_reg_offset;

 	switch (err_type) {
 	case LLCC_DRAM_CE:
 		syn_regs->synd_reg = edac_reg_offset->drp_ecc_sb_err_syn0;
 		syn_regs->count_status_reg = edac_reg_offset->drp_ecc_error_status1;
 		syn_regs->ways_status_reg = edac_reg_offset->drp_ecc_error_status0;
 		break;
 	case LLCC_DRAM_UE:
 		syn_regs->synd_reg = edac_reg_offset->drp_ecc_db_err_syn0;
 		syn_regs->count_status_reg = edac_reg_offset->drp_ecc_error_status1;
 		syn_regs->ways_status_reg = edac_reg_offset->drp_ecc_error_status0;
 		break;
 	case LLCC_TRAM_CE:
 		syn_regs->synd_reg = edac_reg_offset->trp_ecc_sb_err_syn0;
 		syn_regs->count_status_reg = edac_reg_offset->trp_ecc_error_status1;
 		syn_regs->ways_status_reg = edac_reg_offset->trp_ecc_error_status0;
 		break;
 	case LLCC_TRAM_UE:
 		syn_regs->synd_reg = edac_reg_offset->trp_ecc_db_err_syn0;
 		syn_regs->count_status_reg = edac_reg_offset->trp_ecc_error_status1;
 		syn_regs->ways_status_reg = edac_reg_offset->trp_ecc_error_status0;
 		break;
 	}
 }

 /* Dump Syndrome registers data for Tag RAM, Data RAM bit errors*/
 static int
 dump_syn_reg_values(struct llcc_drv_data *drv, u32 bank, int err_type)
 {
 	struct llcc_edac_reg_data reg_data = edac_reg_data[err_type];
 	struct qcom_llcc_syn_regs regs = { };
 	int err_cnt, err_ways, ret, i;
 	u32 synd_reg, synd_val;

 	get_reg_offsets(drv, err_type, &regs);

 	for (i = 0; i < reg_data.reg_cnt; i++) {
 		synd_reg = regs.synd_reg + (i * 4);
 		ret = regmap_read(drv->regmaps[bank], synd_reg,
 				  &synd_val);
 		if (ret)
 			goto clear;

 		edac_printk(KERN_CRIT, EDAC_LLCC, "%s: ECC_SYN%d: 0x%8x\n",
 			    reg_data.name, i, synd_val);
 	}

 	ret = regmap_read(drv->regmaps[bank], regs.count_status_reg,
 			  &err_cnt);
 	if (ret)
 		goto clear;

 	err_cnt &= reg_data.count_mask;
 	err_cnt >>= reg_data.count_shift;
 	edac_printk(KERN_CRIT, EDAC_LLCC, "%s: Error count: 0x%4x\n",
 		    reg_data.name, err_cnt);

 	ret = regmap_read(drv->regmaps[bank], regs.ways_status_reg,
 			  &err_ways);
 	if (ret)
 		goto clear;

 	err_ways &= reg_data.ways_mask;
 	err_ways >>= reg_data.ways_shift;

 	edac_printk(KERN_CRIT, EDAC_LLCC, "%s: Error ways: 0x%4x\n",
 		    reg_data.name, err_ways);

 clear:
 	return qcom_llcc_clear_error_status(err_type, drv);
 }

 static int
 dump_syn_reg(struct edac_device_ctl_info *edev_ctl, int err_type, u32 bank)
 {
 	struct llcc_drv_data *drv = edev_ctl->dev->platform_data;
 	int ret;

 	ret = dump_syn_reg_values(drv, bank, err_type);
 	if (ret)
 		return ret;

 	switch (err_type) {
 	case LLCC_DRAM_CE:
 		edac_device_handle_ce(edev_ctl, 0, bank,
 				      "LLCC Data RAM correctable Error");
 		break;
 	case LLCC_DRAM_UE:
 		edac_device_handle_ue(edev_ctl, 0, bank,
 				      "LLCC Data RAM uncorrectable Error");
 		break;
 	case LLCC_TRAM_CE:
 		edac_device_handle_ce(edev_ctl, 0, bank,
 				      "LLCC Tag RAM correctable Error");
 		break;
 	case LLCC_TRAM_UE:
 		edac_device_handle_ue(edev_ctl, 0, bank,
 				      "LLCC Tag RAM uncorrectable Error");
 		break;
 	default:
 		ret = -EINVAL;
 		edac_printk(KERN_CRIT, EDAC_LLCC, "Unexpected error type: %d\n",
 			    err_type);
 	}

 	return ret;
 }

 static irqreturn_t llcc_ecc_irq_handler(int irq, void *edev_ctl)
 {
 	struct edac_device_ctl_info *edac_dev_ctl = edev_ctl;
 	struct llcc_drv_data *drv = edac_dev_ctl->dev->platform_data;
 	irqreturn_t irq_rc = IRQ_NONE;
 	u32 drp_error, trp_error, i;
 	int ret;

 	/* Iterate over the banks and look for Tag RAM or Data RAM errors */
 	for (i = 0; i < drv->num_banks; i++) {
 		ret = regmap_read(drv->regmaps[i], drv->edac_reg_offset->drp_interrupt_status,
 				  &drp_error);

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

 		ret = regmap_read(drv->regmaps[i], drv->edac_reg_offset->trp_interrupt_0_status,
 				  &trp_error);

 		if (!ret && (trp_error & SB_ECC_ERROR)) {
 			edac_printk(KERN_CRIT, EDAC_LLCC,
 				    "Single Bit Error detected in Tag RAM\n");
 			ret = dump_syn_reg(edev_ctl, LLCC_TRAM_CE, i);
 		} else if (!ret && (trp_error & DB_ECC_ERROR)) {
 			edac_printk(KERN_CRIT, EDAC_LLCC,
 				    "Double Bit Error detected in Tag RAM\n");
 			ret = dump_syn_reg(edev_ctl, LLCC_TRAM_UE, i);
 		}
 		if (!ret)
 			irq_rc = IRQ_HANDLED;
 	}

 	return irq_rc;
 }

 static void llcc_ecc_check(struct edac_device_ctl_info *edev_ctl)
 {
 	llcc_ecc_irq_handler(0, edev_ctl);
 }

 static int qcom_llcc_edac_probe(struct platform_device *pdev)
 {
 	struct llcc_drv_data *llcc_driv_data = pdev->dev.platform_data;
 	struct edac_device_ctl_info *edev_ctl;
 	struct device *dev = &pdev->dev;
 	int ecc_irq;
 	int rc;

 	rc = qcom_llcc_core_setup(llcc_driv_data, llcc_driv_data->bcast_regmap);
 	if (rc)
 		return rc;

 	/* Allocate edac control info */
 	edev_ctl = edac_device_alloc_ctl_info(0, "qcom-llcc", 1, "bank",
 					      llcc_driv_data->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";
 	edev_ctl->panic_on_ue = LLCC_ERP_PANIC_ON_UE;

 	/* Check if LLCC driver has passed ECC IRQ */
 	ecc_irq = llcc_driv_data->ecc_irq;
 	if (ecc_irq > 0) {
 		/* Use interrupt mode if IRQ is available */
 		rc = devm_request_irq(dev, ecc_irq, llcc_ecc_irq_handler,
 			      IRQF_TRIGGER_HIGH, "llcc_ecc", edev_ctl);
 		if (!rc) {
 			edac_op_state = EDAC_OPSTATE_INT;
 			goto irq_done;
 		}
 	}

 	/* Fall back to polling mode otherwise */
 	edev_ctl->poll_msec = ECC_POLL_MSEC;
 	edev_ctl->edac_check = llcc_ecc_check;
 	edac_op_state = EDAC_OPSTATE_POLL;

 irq_done:
 	rc = edac_device_add_device(edev_ctl);
 	if (rc) {
 		edac_device_free_ctl_info(edev_ctl);
 		return rc;
 	}

 	platform_set_drvdata(pdev, edev_ctl);

 	return rc;
 }

 static int qcom_llcc_edac_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 platform_device_id qcom_llcc_edac_id_table[] = {
 	{ .name = "qcom_llcc_edac" },
 	{}
 };
 MODULE_DEVICE_TABLE(platform, qcom_llcc_edac_id_table);

 static struct platform_driver qcom_llcc_edac_driver = {
 	.probe = qcom_llcc_edac_probe,
 	.remove = qcom_llcc_edac_remove,
 	.driver = {
 		.name = "qcom_llcc_edac",
 	},
 	.id_table = qcom_llcc_edac_id_table,
 };
 module_platform_driver(qcom_llcc_edac_driver);

 MODULE_DESCRIPTION("QCOM EDAC driver");
 MODULE_LICENSE("GPL v2");
	// SPDX-License-Identifier: GPL-2.0
	/*
	* Copyright (c) 2018, The Linux Foundation. All rights reserved.
	*/

	#include <linux/edac.h>
	#include <linux/interrupt.h>
	#include <linux/kernel.h>
	#include <linux/of.h>
	#include <linux/platform_device.h>
	#include <linux/regmap.h>
	#include <linux/soc/qcom/llcc-qcom.h>

	#include "edac_mc.h"
	#include "edac_device.h"

	#define EDAC_LLCC "qcom_llcc"

	#define LLCC_ERP_PANIC_ON_UE 1

	#define TRP_SYN_REG_CNT 6
	#define DRP_SYN_REG_CNT 8

	#define LLCC_LB_CNT_MASK GENMASK(31, 28)
	#define LLCC_LB_CNT_SHIFT 28

	/* Mask and shift macros */
	#define ECC_DB_ERR_COUNT_MASK GENMASK(4, 0)
	#define ECC_DB_ERR_WAYS_MASK GENMASK(31, 16)
	#define ECC_DB_ERR_WAYS_SHIFT BIT(4)

	#define ECC_SB_ERR_COUNT_MASK GENMASK(23, 16)
	#define ECC_SB_ERR_COUNT_SHIFT BIT(4)
	#define ECC_SB_ERR_WAYS_MASK GENMASK(15, 0)

	#define SB_ECC_ERROR BIT(0)
	#define DB_ECC_ERROR BIT(1)

	#define DRP_TRP_INT_CLEAR GENMASK(1, 0)
	#define DRP_TRP_CNT_CLEAR GENMASK(1, 0)

	#define SB_ERROR_THRESHOLD 0x1
	#define SB_ERROR_THRESHOLD_SHIFT 24
	#define SB_DB_TRP_INTERRUPT_ENABLE 0x3
	#define TRP0_INTERRUPT_ENABLE 0x1
	#define DRP0_INTERRUPT_ENABLE BIT(6)
	#define SB_DB_DRP_INTERRUPT_ENABLE 0x3

	#define ECC_POLL_MSEC 5000

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

	static const struct llcc_edac_reg_data edac_reg_data[] = {
	[LLCC_DRAM_CE] = {
	.name = "DRAM Single-bit",
	.reg_cnt = DRP_SYN_REG_CNT,
	.count_mask = ECC_SB_ERR_COUNT_MASK,
	.ways_mask = ECC_SB_ERR_WAYS_MASK,
	.count_shift = ECC_SB_ERR_COUNT_SHIFT,
	},
	[LLCC_DRAM_UE] = {
	.name = "DRAM Double-bit",
	.reg_cnt = DRP_SYN_REG_CNT,
	.count_mask = ECC_DB_ERR_COUNT_MASK,
	.ways_mask = ECC_DB_ERR_WAYS_MASK,
	.ways_shift = ECC_DB_ERR_WAYS_SHIFT,
	},
	[LLCC_TRAM_CE] = {
	.name = "TRAM Single-bit",
	.reg_cnt = TRP_SYN_REG_CNT,
	.count_mask = ECC_SB_ERR_COUNT_MASK,
	.ways_mask = ECC_SB_ERR_WAYS_MASK,
	.count_shift = ECC_SB_ERR_COUNT_SHIFT,
	},
	[LLCC_TRAM_UE] = {
	.name = "TRAM Double-bit",
	.reg_cnt = TRP_SYN_REG_CNT,
	.count_mask = ECC_DB_ERR_COUNT_MASK,
	.ways_mask = ECC_DB_ERR_WAYS_MASK,
	.ways_shift = ECC_DB_ERR_WAYS_SHIFT,
	},
	};

	static int qcom_llcc_core_setup(struct llcc_drv_data drv, struct regmap llcc_bcast_regmap)
	{
	u32 sb_err_threshold;
	int ret;

	/*
	* Configure interrupt enable registers such that Tag, Data RAM related
	* interrupts are propagated to interrupt controller for servicing
	*/
	ret = regmap_update_bits(llcc_bcast_regmap, drv->edac_reg_offset->cmn_interrupt_2_enable,
	TRP0_INTERRUPT_ENABLE,
	TRP0_INTERRUPT_ENABLE);
	if (ret)
	return ret;

	ret = regmap_update_bits(llcc_bcast_regmap, drv->edac_reg_offset->trp_interrupt_0_enable,
	SB_DB_TRP_INTERRUPT_ENABLE,
	SB_DB_TRP_INTERRUPT_ENABLE);
	if (ret)
	return ret;

	sb_err_threshold = (SB_ERROR_THRESHOLD << SB_ERROR_THRESHOLD_SHIFT);
	ret = regmap_write(llcc_bcast_regmap, drv->edac_reg_offset->drp_ecc_error_cfg,
	sb_err_threshold);
	if (ret)
	return ret;

	ret = regmap_update_bits(llcc_bcast_regmap, drv->edac_reg_offset->cmn_interrupt_2_enable,
	DRP0_INTERRUPT_ENABLE,
	DRP0_INTERRUPT_ENABLE);
	if (ret)
	return ret;

	ret = regmap_write(llcc_bcast_regmap, drv->edac_reg_offset->drp_interrupt_enable,
	SB_DB_DRP_INTERRUPT_ENABLE);
	return ret;
	}

	/* Clear the error interrupt and counter registers */
	static int
	qcom_llcc_clear_error_status(int err_type, struct llcc_drv_data *drv)
	{
	int ret;

	switch (err_type) {
	case LLCC_DRAM_CE:
	case LLCC_DRAM_UE:
	ret = regmap_write(drv->bcast_regmap,
	drv->edac_reg_offset->drp_interrupt_clear,
	DRP_TRP_INT_CLEAR);
	if (ret)
	return ret;

	ret = regmap_write(drv->bcast_regmap,
	drv->edac_reg_offset->drp_ecc_error_cntr_clear,
	DRP_TRP_CNT_CLEAR);
	if (ret)
	return ret;
	break;
	case LLCC_TRAM_CE:
	case LLCC_TRAM_UE:
	ret = regmap_write(drv->bcast_regmap,
	drv->edac_reg_offset->trp_interrupt_0_clear,
	DRP_TRP_INT_CLEAR);
	if (ret)
	return ret;

	ret = regmap_write(drv->bcast_regmap,
	drv->edac_reg_offset->trp_ecc_error_cntr_clear,
	DRP_TRP_CNT_CLEAR);
	if (ret)
	return ret;
	break;
	default:
	ret = -EINVAL;
	edac_printk(KERN_CRIT, EDAC_LLCC, "Unexpected error type: %d\n",
	err_type);
	}
	return ret;
	}

	struct qcom_llcc_syn_regs {
	u32 synd_reg;
	u32 count_status_reg;
	u32 ways_status_reg;
	};

	static void get_reg_offsets(struct llcc_drv_data *drv, int err_type,
	struct qcom_llcc_syn_regs *syn_regs)
	{
	const struct llcc_edac_reg_offset *edac_reg_offset = drv->edac_reg_offset;

	switch (err_type) {
	case LLCC_DRAM_CE:
	syn_regs->synd_reg = edac_reg_offset->drp_ecc_sb_err_syn0;
	syn_regs->count_status_reg = edac_reg_offset->drp_ecc_error_status1;
	syn_regs->ways_status_reg = edac_reg_offset->drp_ecc_error_status0;
	break;
	case LLCC_DRAM_UE:
	syn_regs->synd_reg = edac_reg_offset->drp_ecc_db_err_syn0;
	syn_regs->count_status_reg = edac_reg_offset->drp_ecc_error_status1;
	syn_regs->ways_status_reg = edac_reg_offset->drp_ecc_error_status0;
	break;
	case LLCC_TRAM_CE:
	syn_regs->synd_reg = edac_reg_offset->trp_ecc_sb_err_syn0;
	syn_regs->count_status_reg = edac_reg_offset->trp_ecc_error_status1;
	syn_regs->ways_status_reg = edac_reg_offset->trp_ecc_error_status0;
	break;
	case LLCC_TRAM_UE:
	syn_regs->synd_reg = edac_reg_offset->trp_ecc_db_err_syn0;
	syn_regs->count_status_reg = edac_reg_offset->trp_ecc_error_status1;
	syn_regs->ways_status_reg = edac_reg_offset->trp_ecc_error_status0;
	break;
	}
	}

	/* Dump Syndrome registers data for Tag RAM, Data RAM bit errors*/
	static int
	dump_syn_reg_values(struct llcc_drv_data *drv, u32 bank, int err_type)
	{
	struct llcc_edac_reg_data reg_data = edac_reg_data[err_type];
	struct qcom_llcc_syn_regs regs = { };
	int err_cnt, err_ways, ret, i;
	u32 synd_reg, synd_val;

	get_reg_offsets(drv, err_type, &regs);

	for (i = 0; i < reg_data.reg_cnt; i++) {
	synd_reg = regs.synd_reg + (i * 4);
	ret = regmap_read(drv->regmaps[bank], synd_reg,
	&synd_val);
	if (ret)
	goto clear;

	edac_printk(KERN_CRIT, EDAC_LLCC, "%s: ECC_SYN%d: 0x%8x\n",
	reg_data.name, i, synd_val);
	}

	ret = regmap_read(drv->regmaps[bank], regs.count_status_reg,
	&err_cnt);
	if (ret)
	goto clear;

	err_cnt &= reg_data.count_mask;
	err_cnt >>= reg_data.count_shift;
	edac_printk(KERN_CRIT, EDAC_LLCC, "%s: Error count: 0x%4x\n",
	reg_data.name, err_cnt);

	ret = regmap_read(drv->regmaps[bank], regs.ways_status_reg,
	&err_ways);
	if (ret)
	goto clear;

	err_ways &= reg_data.ways_mask;
	err_ways >>= reg_data.ways_shift;

	edac_printk(KERN_CRIT, EDAC_LLCC, "%s: Error ways: 0x%4x\n",
	reg_data.name, err_ways);

	clear:
	return qcom_llcc_clear_error_status(err_type, drv);
	}

	static int
	dump_syn_reg(struct edac_device_ctl_info *edev_ctl, int err_type, u32 bank)
	{
	struct llcc_drv_data *drv = edev_ctl->dev->platform_data;
	int ret;

	ret = dump_syn_reg_values(drv, bank, err_type);
	if (ret)
	return ret;

	switch (err_type) {
	case LLCC_DRAM_CE:
	edac_device_handle_ce(edev_ctl, 0, bank,
	"LLCC Data RAM correctable Error");
	break;
	case LLCC_DRAM_UE:
	edac_device_handle_ue(edev_ctl, 0, bank,
	"LLCC Data RAM uncorrectable Error");
	break;
	case LLCC_TRAM_CE:
	edac_device_handle_ce(edev_ctl, 0, bank,
	"LLCC Tag RAM correctable Error");
	break;
	case LLCC_TRAM_UE:
	edac_device_handle_ue(edev_ctl, 0, bank,
	"LLCC Tag RAM uncorrectable Error");
	break;
	default:
	ret = -EINVAL;
	edac_printk(KERN_CRIT, EDAC_LLCC, "Unexpected error type: %d\n",
	err_type);
	}

	return ret;
	}

	static irqreturn_t llcc_ecc_irq_handler(int irq, void *edev_ctl)
	{
	struct edac_device_ctl_info *edac_dev_ctl = edev_ctl;
	struct llcc_drv_data *drv = edac_dev_ctl->dev->platform_data;
	irqreturn_t irq_rc = IRQ_NONE;
	u32 drp_error, trp_error, i;
	int ret;

	/* Iterate over the banks and look for Tag RAM or Data RAM errors */
	for (i = 0; i < drv->num_banks; i++) {
	ret = regmap_read(drv->regmaps[i], drv->edac_reg_offset->drp_interrupt_status,
	&drp_error);

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

	ret = regmap_read(drv->regmaps[i], drv->edac_reg_offset->trp_interrupt_0_status,
	&trp_error);

	if (!ret && (trp_error & SB_ECC_ERROR)) {
	edac_printk(KERN_CRIT, EDAC_LLCC,
	"Single Bit Error detected in Tag RAM\n");
	ret = dump_syn_reg(edev_ctl, LLCC_TRAM_CE, i);
	} else if (!ret && (trp_error & DB_ECC_ERROR)) {
	edac_printk(KERN_CRIT, EDAC_LLCC,
	"Double Bit Error detected in Tag RAM\n");
	ret = dump_syn_reg(edev_ctl, LLCC_TRAM_UE, i);
	}
	if (!ret)
	irq_rc = IRQ_HANDLED;
	}

	return irq_rc;
	}

	static void llcc_ecc_check(struct edac_device_ctl_info *edev_ctl)
	{
	llcc_ecc_irq_handler(0, edev_ctl);
	}

	static int qcom_llcc_edac_probe(struct platform_device *pdev)
	{
	struct llcc_drv_data *llcc_driv_data = pdev->dev.platform_data;
	struct edac_device_ctl_info *edev_ctl;
	struct device *dev = &pdev->dev;
	int ecc_irq;
	int rc;

	rc = qcom_llcc_core_setup(llcc_driv_data, llcc_driv_data->bcast_regmap);
	if (rc)
	return rc;

	/* Allocate edac control info */
	edev_ctl = edac_device_alloc_ctl_info(0, "qcom-llcc", 1, "bank",
	llcc_driv_data->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";
	edev_ctl->panic_on_ue = LLCC_ERP_PANIC_ON_UE;

	/* Check if LLCC driver has passed ECC IRQ */
	ecc_irq = llcc_driv_data->ecc_irq;
	if (ecc_irq > 0) {
	/* Use interrupt mode if IRQ is available */
	rc = devm_request_irq(dev, ecc_irq, llcc_ecc_irq_handler,
	IRQF_TRIGGER_HIGH, "llcc_ecc", edev_ctl);
	if (!rc) {
	edac_op_state = EDAC_OPSTATE_INT;
	goto irq_done;
	}
	}

	/* Fall back to polling mode otherwise */
	edev_ctl->poll_msec = ECC_POLL_MSEC;
	edev_ctl->edac_check = llcc_ecc_check;
	edac_op_state = EDAC_OPSTATE_POLL;

	irq_done:
	rc = edac_device_add_device(edev_ctl);
	if (rc) {
	edac_device_free_ctl_info(edev_ctl);
	return rc;
	}

	platform_set_drvdata(pdev, edev_ctl);

	return rc;
	}

	static int qcom_llcc_edac_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 platform_device_id qcom_llcc_edac_id_table[] = {
	{ .name = "qcom_llcc_edac" },
	{}
	};
	MODULE_DEVICE_TABLE(platform, qcom_llcc_edac_id_table);

	static struct platform_driver qcom_llcc_edac_driver = {
	.probe = qcom_llcc_edac_probe,
	.remove = qcom_llcc_edac_remove,
	.driver = {
	.name = "qcom_llcc_edac",
	},
	.id_table = qcom_llcc_edac_id_table,
	};
	module_platform_driver(qcom_llcc_edac_driver);

	MODULE_DESCRIPTION("QCOM EDAC driver");
	MODULE_LICENSE("GPL v2");