drivers/edac/zynqmp_edac.c - pub/scm/linux/kernel/git/deller/linux-fbdev - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 /*
  * Xilinx ZynqMP OCM ECC Driver
  *
  * Copyright (C) 2022 Advanced Micro Devices, Inc.
  */

 #include <linux/edac.h>
 #include <linux/interrupt.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_platform.h>
 #include <linux/platform_device.h>

 #include "edac_module.h"

 #define ZYNQMP_OCM_EDAC_MSG_SIZE	256

 #define ZYNQMP_OCM_EDAC_STRING	"zynqmp_ocm"

 /* Error/Interrupt registers */
 #define ERR_CTRL_OFST		0x0
 #define OCM_ISR_OFST		0x04
 #define OCM_IMR_OFST		0x08
 #define OCM_IEN_OFST		0x0C
 #define OCM_IDS_OFST		0x10

 /* ECC control register */
 #define ECC_CTRL_OFST		0x14

 /* Correctable error info registers */
 #define CE_FFA_OFST		0x1C
 #define CE_FFD0_OFST		0x20
 #define CE_FFD1_OFST		0x24
 #define CE_FFD2_OFST		0x28
 #define CE_FFD3_OFST		0x2C
 #define CE_FFE_OFST		0x30

 /* Uncorrectable error info registers */
 #define UE_FFA_OFST		0x34
 #define UE_FFD0_OFST		0x38
 #define UE_FFD1_OFST		0x3C
 #define UE_FFD2_OFST		0x40
 #define UE_FFD3_OFST		0x44
 #define UE_FFE_OFST		0x48

 /* ECC control register bit field definitions */
 #define ECC_CTRL_CLR_CE_ERR	0x40
 #define ECC_CTRL_CLR_UE_ERR	0x80

 /* Fault injection data and count registers */
 #define OCM_FID0_OFST		0x4C
 #define OCM_FID1_OFST		0x50
 #define OCM_FID2_OFST		0x54
 #define OCM_FID3_OFST		0x58
 #define OCM_FIC_OFST		0x74

 #define UE_MAX_BITPOS_LOWER	31
 #define UE_MIN_BITPOS_UPPER	32
 #define UE_MAX_BITPOS_UPPER	63

 /* Interrupt masks */
 #define OCM_CEINTR_MASK		BIT(6)
 #define OCM_UEINTR_MASK		BIT(7)
 #define OCM_ECC_ENABLE_MASK	BIT(0)

 #define OCM_FICOUNT_MASK	GENMASK(23, 0)
 #define OCM_NUM_UE_BITPOS	2
 #define OCM_BASEVAL		0xFFFC0000
 #define EDAC_DEVICE		"ZynqMP-OCM"

 /**
  * struct ecc_error_info - ECC error log information
  * @addr:	Fault generated at this address
  * @fault_lo:	Generated fault data (lower 32-bit)
  * @fault_hi:	Generated fault data (upper 32-bit)
  */
 struct ecc_error_info {
 	u32 addr;
 	u32 fault_lo;
 	u32 fault_hi;
 };

 /**
  * struct ecc_status - ECC status information to report
  * @ce_cnt:	Correctable error count
  * @ue_cnt:	Uncorrectable error count
  * @ceinfo:	Correctable error log information
  * @ueinfo:	Uncorrectable error log information
  */
 struct ecc_status {
 	u32 ce_cnt;
 	u32 ue_cnt;
 	struct ecc_error_info ceinfo;
 	struct ecc_error_info ueinfo;
 };

 /**
  * struct edac_priv - OCM private instance data
  * @baseaddr:	Base address of the OCM
  * @message:	Buffer for framing the event specific info
  * @stat:	ECC status information
  * @ce_cnt:	Correctable Error count
  * @ue_cnt:	Uncorrectable Error count
  * @debugfs_dir:	Directory entry for debugfs
  * @ce_bitpos:	Bit position for Correctable Error
  * @ue_bitpos:	Array to store UnCorrectable Error bit positions
  * @fault_injection_cnt: Fault Injection Counter value
  */
 struct edac_priv {
 	void __iomem *baseaddr;
 	char message[ZYNQMP_OCM_EDAC_MSG_SIZE];
 	struct ecc_status stat;
 	u32 ce_cnt;
 	u32 ue_cnt;
 #ifdef CONFIG_EDAC_DEBUG
 	struct dentry *debugfs_dir;
 	u8 ce_bitpos;
 	u8 ue_bitpos[OCM_NUM_UE_BITPOS];
 	u32 fault_injection_cnt;
 #endif
 };

 /**
  * get_error_info - Get the current ECC error info
  * @base:	Pointer to the base address of the OCM
  * @p:		Pointer to the OCM ECC status structure
  * @mask:	Status register mask value
  *
  * Determines there is any ECC error or not
  *
  */
 static void get_error_info(void __iomem *base, struct ecc_status *p, int mask)
 {
 	if (mask & OCM_CEINTR_MASK) {
 		p->ce_cnt++;
 		p->ceinfo.fault_lo = readl(base + CE_FFD0_OFST);
 		p->ceinfo.fault_hi = readl(base + CE_FFD1_OFST);
 		p->ceinfo.addr = (OCM_BASEVAL | readl(base + CE_FFA_OFST));
 		writel(ECC_CTRL_CLR_CE_ERR, base + OCM_ISR_OFST);
 	} else if (mask & OCM_UEINTR_MASK) {
 		p->ue_cnt++;
 		p->ueinfo.fault_lo = readl(base + UE_FFD0_OFST);
 		p->ueinfo.fault_hi = readl(base + UE_FFD1_OFST);
 		p->ueinfo.addr = (OCM_BASEVAL | readl(base + UE_FFA_OFST));
 		writel(ECC_CTRL_CLR_UE_ERR, base + OCM_ISR_OFST);
 	}
 }

 /**
  * handle_error - Handle error types CE and UE
  * @dci:	Pointer to the EDAC device instance
  * @p:		Pointer to the OCM ECC status structure
  *
  * Handles correctable and uncorrectable errors.
  */
 static void handle_error(struct edac_device_ctl_info *dci, struct ecc_status *p)
 {
 	struct edac_priv *priv = dci->pvt_info;
 	struct ecc_error_info *pinf;

 	if (p->ce_cnt) {
 		pinf = &p->ceinfo;
 		snprintf(priv->message, ZYNQMP_OCM_EDAC_MSG_SIZE,
 			 "\nOCM ECC error type :%s\nAddr: [0x%x]\nFault Data[0x%08x%08x]",
 			 "CE", pinf->addr, pinf->fault_hi, pinf->fault_lo);
 		edac_device_handle_ce(dci, 0, 0, priv->message);
 	}

 	if (p->ue_cnt) {
 		pinf = &p->ueinfo;
 		snprintf(priv->message, ZYNQMP_OCM_EDAC_MSG_SIZE,
 			 "\nOCM ECC error type :%s\nAddr: [0x%x]\nFault Data[0x%08x%08x]",
 			 "UE", pinf->addr, pinf->fault_hi, pinf->fault_lo);
 		edac_device_handle_ue(dci, 0, 0, priv->message);
 	}

 	memset(p, 0, sizeof(*p));
 }

 /**
  * intr_handler - ISR routine
  * @irq:        irq number
  * @dev_id:     device id pointer
  *
  * Return: IRQ_NONE, if CE/UE interrupt not set or IRQ_HANDLED otherwise
  */
 static irqreturn_t intr_handler(int irq, void *dev_id)
 {
 	struct edac_device_ctl_info *dci = dev_id;
 	struct edac_priv *priv = dci->pvt_info;
 	int regval;

 	regval = readl(priv->baseaddr + OCM_ISR_OFST);
 	if (!(regval & (OCM_CEINTR_MASK | OCM_UEINTR_MASK))) {
 		WARN_ONCE(1, "Unhandled IRQ%d, ISR: 0x%x", irq, regval);
 		return IRQ_NONE;
 	}

 	get_error_info(priv->baseaddr, &priv->stat, regval);

 	priv->ce_cnt += priv->stat.ce_cnt;
 	priv->ue_cnt += priv->stat.ue_cnt;
 	handle_error(dci, &priv->stat);

 	return IRQ_HANDLED;
 }

 /**
  * get_eccstate - Return the ECC status
  * @base:	Pointer to the OCM base address
  *
  * Get the ECC enable/disable status
  *
  * Return: ECC status 0/1.
  */
 static bool get_eccstate(void __iomem *base)
 {
 	return readl(base + ECC_CTRL_OFST) & OCM_ECC_ENABLE_MASK;
 }

 #ifdef CONFIG_EDAC_DEBUG
 /**
  * write_fault_count - write fault injection count
  * @priv:	Pointer to the EDAC private struct
  *
  * Update the fault injection count register, once the counter reaches
  * zero, it injects errors
  */
 static void write_fault_count(struct edac_priv *priv)
 {
 	u32 ficount = priv->fault_injection_cnt;

 	if (ficount & ~OCM_FICOUNT_MASK) {
 		ficount &= OCM_FICOUNT_MASK;
 		edac_printk(KERN_INFO, EDAC_DEVICE,
 			    "Fault injection count value truncated to %d\n", ficount);
 	}

 	writel(ficount, priv->baseaddr + OCM_FIC_OFST);
 }

 /*
  * To get the Correctable Error injected, the following steps are needed:
  * - Setup the optional Fault Injection Count:
  *	echo <fault_count val> > /sys/kernel/debug/edac/ocm/inject_fault_count
  * - Write the Correctable Error bit position value:
  *	echo <bit_pos val> > /sys/kernel/debug/edac/ocm/inject_ce_bitpos
  */
 static ssize_t inject_ce_write(struct file *file, const char __user *data,
 			       size_t count, loff_t *ppos)
 {
 	struct edac_device_ctl_info *edac_dev = file->private_data;
 	struct edac_priv *priv = edac_dev->pvt_info;
 	int ret;

 	if (!data)
 		return -EFAULT;

 	ret = kstrtou8_from_user(data, count, 0, &priv->ce_bitpos);
 	if (ret)
 		return ret;

 	if (priv->ce_bitpos > UE_MAX_BITPOS_UPPER)
 		return -EINVAL;

 	if (priv->ce_bitpos <= UE_MAX_BITPOS_LOWER) {
 		writel(BIT(priv->ce_bitpos), priv->baseaddr + OCM_FID0_OFST);
 		writel(0, priv->baseaddr + OCM_FID1_OFST);
 	} else {
 		writel(BIT(priv->ce_bitpos - UE_MIN_BITPOS_UPPER),
 		       priv->baseaddr + OCM_FID1_OFST);
 		writel(0, priv->baseaddr + OCM_FID0_OFST);
 	}

 	write_fault_count(priv);

 	return count;
 }

 static const struct file_operations inject_ce_fops = {
 	.open = simple_open,
 	.write = inject_ce_write,
 	.llseek = generic_file_llseek,
 };

 /*
  * To get the Uncorrectable Error injected, the following steps are needed:
  * - Setup the optional Fault Injection Count:
  *      echo <fault_count val> > /sys/kernel/debug/edac/ocm/inject_fault_count
  * - Write the Uncorrectable Error bit position values:
  *      echo <bit_pos0 val>,<bit_pos1 val> > /sys/kernel/debug/edac/ocm/inject_ue_bitpos
  */
 static ssize_t inject_ue_write(struct file *file, const char __user *data,
 			       size_t count, loff_t *ppos)
 {
 	struct edac_device_ctl_info *edac_dev = file->private_data;
 	struct edac_priv *priv = edac_dev->pvt_info;
 	char buf[6], *pbuf, *token[2];
 	u64 ue_bitpos;
 	int i, ret;
 	u8 len;

 	if (!data)
 		return -EFAULT;

 	len = min_t(size_t, count, sizeof(buf));
 	if (copy_from_user(buf, data, len))
 		return -EFAULT;

 	buf[len] = '\0';
 	pbuf = &buf[0];
 	for (i = 0; i < OCM_NUM_UE_BITPOS; i++)
 		token[i] = strsep(&pbuf, ",");

 	ret = kstrtou8(token[0], 0, &priv->ue_bitpos[0]);
 	if (ret)
 		return ret;

 	ret = kstrtou8(token[1], 0, &priv->ue_bitpos[1]);
 	if (ret)
 		return ret;

 	if (priv->ue_bitpos[0] > UE_MAX_BITPOS_UPPER ||
 	    priv->ue_bitpos[1] > UE_MAX_BITPOS_UPPER)
 		return -EINVAL;

 	if (priv->ue_bitpos[0] == priv->ue_bitpos[1]) {
 		edac_printk(KERN_ERR, EDAC_DEVICE, "Bit positions should not be equal\n");
 		return -EINVAL;
 	}

 	ue_bitpos = BIT(priv->ue_bitpos[0]) | BIT(priv->ue_bitpos[1]);

 	writel((u32)ue_bitpos, priv->baseaddr + OCM_FID0_OFST);
 	writel((u32)(ue_bitpos >> 32), priv->baseaddr + OCM_FID1_OFST);

 	write_fault_count(priv);

 	return count;
 }

 static const struct file_operations inject_ue_fops = {
 	.open = simple_open,
 	.write = inject_ue_write,
 	.llseek = generic_file_llseek,
 };

 static void setup_debugfs(struct edac_device_ctl_info *edac_dev)
 {
 	struct edac_priv *priv = edac_dev->pvt_info;

 	priv->debugfs_dir = edac_debugfs_create_dir("ocm");
 	if (!priv->debugfs_dir)
 		return;

 	edac_debugfs_create_x32("inject_fault_count", 0644, priv->debugfs_dir,
 				&priv->fault_injection_cnt);
 	edac_debugfs_create_file("inject_ue_bitpos", 0644, priv->debugfs_dir,
 				 edac_dev, &inject_ue_fops);
 	edac_debugfs_create_file("inject_ce_bitpos", 0644, priv->debugfs_dir,
 				 edac_dev, &inject_ce_fops);
 }
 #endif

 static int edac_probe(struct platform_device *pdev)
 {
 	struct edac_device_ctl_info *dci;
 	struct edac_priv *priv;
 	void __iomem *baseaddr;
 	struct resource *res;
 	int irq, ret;

 	baseaddr = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
 	if (IS_ERR(baseaddr))
 		return PTR_ERR(baseaddr);

 	if (!get_eccstate(baseaddr)) {
 		edac_printk(KERN_INFO, EDAC_DEVICE, "ECC not enabled\n");
 		return -ENXIO;
 	}

 	dci = edac_device_alloc_ctl_info(sizeof(*priv), ZYNQMP_OCM_EDAC_STRING,
 					 1, ZYNQMP_OCM_EDAC_STRING, 1, 0, NULL, 0,
 					 edac_device_alloc_index());
 	if (!dci)
 		return -ENOMEM;

 	priv = dci->pvt_info;
 	platform_set_drvdata(pdev, dci);
 	dci->dev = &pdev->dev;
 	priv->baseaddr = baseaddr;
 	dci->mod_name = pdev->dev.driver->name;
 	dci->ctl_name = ZYNQMP_OCM_EDAC_STRING;
 	dci->dev_name = dev_name(&pdev->dev);

 	irq = platform_get_irq(pdev, 0);
 	if (irq < 0) {
 		ret = irq;
 		goto free_dev_ctl;
 	}

 	ret = devm_request_irq(&pdev->dev, irq, intr_handler, 0,
 			       dev_name(&pdev->dev), dci);
 	if (ret) {
 		edac_printk(KERN_ERR, EDAC_DEVICE, "Failed to request Irq\n");
 		goto free_dev_ctl;
 	}

 	/* Enable UE, CE interrupts */
 	writel((OCM_CEINTR_MASK | OCM_UEINTR_MASK), priv->baseaddr + OCM_IEN_OFST);

 #ifdef CONFIG_EDAC_DEBUG
 	setup_debugfs(dci);
 #endif

 	ret = edac_device_add_device(dci);
 	if (ret)
 		goto free_dev_ctl;

 	return 0;

 free_dev_ctl:
 	edac_device_free_ctl_info(dci);

 	return ret;
 }

 static void edac_remove(struct platform_device *pdev)
 {
 	struct edac_device_ctl_info *dci = platform_get_drvdata(pdev);
 	struct edac_priv *priv = dci->pvt_info;

 	/* Disable UE, CE interrupts */
 	writel((OCM_CEINTR_MASK | OCM_UEINTR_MASK), priv->baseaddr + OCM_IDS_OFST);

 #ifdef CONFIG_EDAC_DEBUG
 	debugfs_remove_recursive(priv->debugfs_dir);
 #endif

 	edac_device_del_device(&pdev->dev);
 	edac_device_free_ctl_info(dci);
 }

 static const struct of_device_id zynqmp_ocm_edac_match[] = {
 	{ .compatible = "xlnx,zynqmp-ocmc-1.0"},
 	{ /* end of table */ }
 };

 MODULE_DEVICE_TABLE(of, zynqmp_ocm_edac_match);

 static struct platform_driver zynqmp_ocm_edac_driver = {
 	.driver = {
 		   .name = "zynqmp-ocm-edac",
 		   .of_match_table = zynqmp_ocm_edac_match,
 		   },
 	.probe = edac_probe,
 	.remove_new = edac_remove,
 };

 module_platform_driver(zynqmp_ocm_edac_driver);

 MODULE_AUTHOR("Advanced Micro Devices, Inc");
 MODULE_DESCRIPTION("Xilinx ZynqMP OCM ECC driver");
 MODULE_LICENSE("GPL");
	// SPDX-License-Identifier: GPL-2.0
	/*
	* Xilinx ZynqMP OCM ECC Driver
	*
	* Copyright (C) 2022 Advanced Micro Devices, Inc.
	*/

	#include <linux/edac.h>
	#include <linux/interrupt.h>
	#include <linux/module.h>
	#include <linux/of.h>
	#include <linux/of_platform.h>
	#include <linux/platform_device.h>

	#include "edac_module.h"

	#define ZYNQMP_OCM_EDAC_MSG_SIZE 256

	#define ZYNQMP_OCM_EDAC_STRING "zynqmp_ocm"

	/* Error/Interrupt registers */
	#define ERR_CTRL_OFST 0x0
	#define OCM_ISR_OFST 0x04
	#define OCM_IMR_OFST 0x08
	#define OCM_IEN_OFST 0x0C
	#define OCM_IDS_OFST 0x10

	/* ECC control register */
	#define ECC_CTRL_OFST 0x14

	/* Correctable error info registers */
	#define CE_FFA_OFST 0x1C
	#define CE_FFD0_OFST 0x20
	#define CE_FFD1_OFST 0x24
	#define CE_FFD2_OFST 0x28
	#define CE_FFD3_OFST 0x2C
	#define CE_FFE_OFST 0x30

	/* Uncorrectable error info registers */
	#define UE_FFA_OFST 0x34
	#define UE_FFD0_OFST 0x38
	#define UE_FFD1_OFST 0x3C
	#define UE_FFD2_OFST 0x40
	#define UE_FFD3_OFST 0x44
	#define UE_FFE_OFST 0x48

	/* ECC control register bit field definitions */
	#define ECC_CTRL_CLR_CE_ERR 0x40
	#define ECC_CTRL_CLR_UE_ERR 0x80

	/* Fault injection data and count registers */
	#define OCM_FID0_OFST 0x4C
	#define OCM_FID1_OFST 0x50
	#define OCM_FID2_OFST 0x54
	#define OCM_FID3_OFST 0x58
	#define OCM_FIC_OFST 0x74

	#define UE_MAX_BITPOS_LOWER 31
	#define UE_MIN_BITPOS_UPPER 32
	#define UE_MAX_BITPOS_UPPER 63

	/* Interrupt masks */
	#define OCM_CEINTR_MASK BIT(6)
	#define OCM_UEINTR_MASK BIT(7)
	#define OCM_ECC_ENABLE_MASK BIT(0)

	#define OCM_FICOUNT_MASK GENMASK(23, 0)
	#define OCM_NUM_UE_BITPOS 2
	#define OCM_BASEVAL 0xFFFC0000
	#define EDAC_DEVICE "ZynqMP-OCM"

	/**
	* struct ecc_error_info - ECC error log information
	* @addr: Fault generated at this address
	* @fault_lo: Generated fault data (lower 32-bit)
	* @fault_hi: Generated fault data (upper 32-bit)
	*/
	struct ecc_error_info {
	u32 addr;
	u32 fault_lo;
	u32 fault_hi;
	};

	/**
	* struct ecc_status - ECC status information to report
	* @ce_cnt: Correctable error count
	* @ue_cnt: Uncorrectable error count
	* @ceinfo: Correctable error log information
	* @ueinfo: Uncorrectable error log information
	*/
	struct ecc_status {
	u32 ce_cnt;
	u32 ue_cnt;
	struct ecc_error_info ceinfo;
	struct ecc_error_info ueinfo;
	};

	/**
	* struct edac_priv - OCM private instance data
	* @baseaddr: Base address of the OCM
	* @message: Buffer for framing the event specific info
	* @stat: ECC status information
	* @ce_cnt: Correctable Error count
	* @ue_cnt: Uncorrectable Error count
	* @debugfs_dir: Directory entry for debugfs
	* @ce_bitpos: Bit position for Correctable Error
	* @ue_bitpos: Array to store UnCorrectable Error bit positions
	* @fault_injection_cnt: Fault Injection Counter value
	*/
	struct edac_priv {
	void __iomem *baseaddr;
	char message[ZYNQMP_OCM_EDAC_MSG_SIZE];
	struct ecc_status stat;
	u32 ce_cnt;
	u32 ue_cnt;
	#ifdef CONFIG_EDAC_DEBUG
	struct dentry *debugfs_dir;
	u8 ce_bitpos;
	u8 ue_bitpos[OCM_NUM_UE_BITPOS];
	u32 fault_injection_cnt;
	#endif
	};

	/**
	* get_error_info - Get the current ECC error info
	* @base: Pointer to the base address of the OCM
	* @p: Pointer to the OCM ECC status structure
	* @mask: Status register mask value
	*
	* Determines there is any ECC error or not
	*
	*/
	static void get_error_info(void __iomem base, struct ecc_status p, int mask)
	{
	if (mask & OCM_CEINTR_MASK) {
	p->ce_cnt++;
	p->ceinfo.fault_lo = readl(base + CE_FFD0_OFST);
	p->ceinfo.fault_hi = readl(base + CE_FFD1_OFST);
	p->ceinfo.addr = (OCM_BASEVAL \| readl(base + CE_FFA_OFST));
	writel(ECC_CTRL_CLR_CE_ERR, base + OCM_ISR_OFST);
	} else if (mask & OCM_UEINTR_MASK) {
	p->ue_cnt++;
	p->ueinfo.fault_lo = readl(base + UE_FFD0_OFST);
	p->ueinfo.fault_hi = readl(base + UE_FFD1_OFST);
	p->ueinfo.addr = (OCM_BASEVAL \| readl(base + UE_FFA_OFST));
	writel(ECC_CTRL_CLR_UE_ERR, base + OCM_ISR_OFST);
	}
	}

	/**
	* handle_error - Handle error types CE and UE
	* @dci: Pointer to the EDAC device instance
	* @p: Pointer to the OCM ECC status structure
	*
	* Handles correctable and uncorrectable errors.
	*/
	static void handle_error(struct edac_device_ctl_info dci, struct ecc_status p)
	{
	struct edac_priv *priv = dci->pvt_info;
	struct ecc_error_info *pinf;

	if (p->ce_cnt) {
	pinf = &p->ceinfo;
	snprintf(priv->message, ZYNQMP_OCM_EDAC_MSG_SIZE,
	"\nOCM ECC error type :%s\nAddr: [0x%x]\nFault Data[0x%08x%08x]",
	"CE", pinf->addr, pinf->fault_hi, pinf->fault_lo);
	edac_device_handle_ce(dci, 0, 0, priv->message);
	}

	if (p->ue_cnt) {
	pinf = &p->ueinfo;
	snprintf(priv->message, ZYNQMP_OCM_EDAC_MSG_SIZE,
	"\nOCM ECC error type :%s\nAddr: [0x%x]\nFault Data[0x%08x%08x]",
	"UE", pinf->addr, pinf->fault_hi, pinf->fault_lo);
	edac_device_handle_ue(dci, 0, 0, priv->message);
	}

	memset(p, 0, sizeof(*p));
	}

	/**
	* intr_handler - ISR routine
	* @irq: irq number
	* @dev_id: device id pointer
	*
	* Return: IRQ_NONE, if CE/UE interrupt not set or IRQ_HANDLED otherwise
	*/
	static irqreturn_t intr_handler(int irq, void *dev_id)
	{
	struct edac_device_ctl_info *dci = dev_id;
	struct edac_priv *priv = dci->pvt_info;
	int regval;

	regval = readl(priv->baseaddr + OCM_ISR_OFST);
	if (!(regval & (OCM_CEINTR_MASK \| OCM_UEINTR_MASK))) {
	WARN_ONCE(1, "Unhandled IRQ%d, ISR: 0x%x", irq, regval);
	return IRQ_NONE;
	}

	get_error_info(priv->baseaddr, &priv->stat, regval);

	priv->ce_cnt += priv->stat.ce_cnt;
	priv->ue_cnt += priv->stat.ue_cnt;
	handle_error(dci, &priv->stat);

	return IRQ_HANDLED;
	}

	/**
	* get_eccstate - Return the ECC status
	* @base: Pointer to the OCM base address
	*
	* Get the ECC enable/disable status
	*
	* Return: ECC status 0/1.
	*/
	static bool get_eccstate(void __iomem *base)
	{
	return readl(base + ECC_CTRL_OFST) & OCM_ECC_ENABLE_MASK;
	}

	#ifdef CONFIG_EDAC_DEBUG
	/**
	* write_fault_count - write fault injection count
	* @priv: Pointer to the EDAC private struct
	*
	* Update the fault injection count register, once the counter reaches
	* zero, it injects errors
	*/
	static void write_fault_count(struct edac_priv *priv)
	{
	u32 ficount = priv->fault_injection_cnt;

	if (ficount & ~OCM_FICOUNT_MASK) {
	ficount &= OCM_FICOUNT_MASK;
	edac_printk(KERN_INFO, EDAC_DEVICE,
	"Fault injection count value truncated to %d\n", ficount);
	}

	writel(ficount, priv->baseaddr + OCM_FIC_OFST);
	}

	/*
	* To get the Correctable Error injected, the following steps are needed:
	* - Setup the optional Fault Injection Count:
	* echo <fault_count val> > /sys/kernel/debug/edac/ocm/inject_fault_count
	* - Write the Correctable Error bit position value:
	* echo <bit_pos val> > /sys/kernel/debug/edac/ocm/inject_ce_bitpos
	*/
	static ssize_t inject_ce_write(struct file file, const char __user data,
	size_t count, loff_t *ppos)
	{
	struct edac_device_ctl_info *edac_dev = file->private_data;
	struct edac_priv *priv = edac_dev->pvt_info;
	int ret;

	if (!data)
	return -EFAULT;

	ret = kstrtou8_from_user(data, count, 0, &priv->ce_bitpos);
	if (ret)
	return ret;

	if (priv->ce_bitpos > UE_MAX_BITPOS_UPPER)
	return -EINVAL;

	if (priv->ce_bitpos <= UE_MAX_BITPOS_LOWER) {
	writel(BIT(priv->ce_bitpos), priv->baseaddr + OCM_FID0_OFST);
	writel(0, priv->baseaddr + OCM_FID1_OFST);
	} else {
	writel(BIT(priv->ce_bitpos - UE_MIN_BITPOS_UPPER),
	priv->baseaddr + OCM_FID1_OFST);
	writel(0, priv->baseaddr + OCM_FID0_OFST);
	}

	write_fault_count(priv);

	return count;
	}

	static const struct file_operations inject_ce_fops = {
	.open = simple_open,
	.write = inject_ce_write,
	.llseek = generic_file_llseek,
	};

	/*
	* To get the Uncorrectable Error injected, the following steps are needed:
	* - Setup the optional Fault Injection Count:
	* echo <fault_count val> > /sys/kernel/debug/edac/ocm/inject_fault_count
	* - Write the Uncorrectable Error bit position values:
	* echo <bit_pos0 val>,<bit_pos1 val> > /sys/kernel/debug/edac/ocm/inject_ue_bitpos
	*/
	static ssize_t inject_ue_write(struct file file, const char __user data,
	size_t count, loff_t *ppos)
	{
	struct edac_device_ctl_info *edac_dev = file->private_data;
	struct edac_priv *priv = edac_dev->pvt_info;
	char buf[6], pbuf, token[2];
	u64 ue_bitpos;
	int i, ret;
	u8 len;

	if (!data)
	return -EFAULT;

	len = min_t(size_t, count, sizeof(buf));
	if (copy_from_user(buf, data, len))
	return -EFAULT;

	buf[len] = '\0';
	pbuf = &buf[0];
	for (i = 0; i < OCM_NUM_UE_BITPOS; i++)
	token[i] = strsep(&pbuf, ",");

	ret = kstrtou8(token[0], 0, &priv->ue_bitpos[0]);
	if (ret)
	return ret;

	ret = kstrtou8(token[1], 0, &priv->ue_bitpos[1]);
	if (ret)
	return ret;

	if (priv->ue_bitpos[0] > UE_MAX_BITPOS_UPPER \|\|
	priv->ue_bitpos[1] > UE_MAX_BITPOS_UPPER)
	return -EINVAL;

	if (priv->ue_bitpos[0] == priv->ue_bitpos[1]) {
	edac_printk(KERN_ERR, EDAC_DEVICE, "Bit positions should not be equal\n");
	return -EINVAL;
	}

	ue_bitpos = BIT(priv->ue_bitpos[0]) \| BIT(priv->ue_bitpos[1]);

	writel((u32)ue_bitpos, priv->baseaddr + OCM_FID0_OFST);
	writel((u32)(ue_bitpos >> 32), priv->baseaddr + OCM_FID1_OFST);

	write_fault_count(priv);

	return count;
	}

	static const struct file_operations inject_ue_fops = {
	.open = simple_open,
	.write = inject_ue_write,
	.llseek = generic_file_llseek,
	};

	static void setup_debugfs(struct edac_device_ctl_info *edac_dev)
	{
	struct edac_priv *priv = edac_dev->pvt_info;

	priv->debugfs_dir = edac_debugfs_create_dir("ocm");
	if (!priv->debugfs_dir)
	return;

	edac_debugfs_create_x32("inject_fault_count", 0644, priv->debugfs_dir,
	&priv->fault_injection_cnt);
	edac_debugfs_create_file("inject_ue_bitpos", 0644, priv->debugfs_dir,
	edac_dev, &inject_ue_fops);
	edac_debugfs_create_file("inject_ce_bitpos", 0644, priv->debugfs_dir,
	edac_dev, &inject_ce_fops);
	}
	#endif

	static int edac_probe(struct platform_device *pdev)
	{
	struct edac_device_ctl_info *dci;
	struct edac_priv *priv;
	void __iomem *baseaddr;
	struct resource *res;
	int irq, ret;

	baseaddr = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
	if (IS_ERR(baseaddr))
	return PTR_ERR(baseaddr);

	if (!get_eccstate(baseaddr)) {
	edac_printk(KERN_INFO, EDAC_DEVICE, "ECC not enabled\n");
	return -ENXIO;
	}

	dci = edac_device_alloc_ctl_info(sizeof(*priv), ZYNQMP_OCM_EDAC_STRING,
	1, ZYNQMP_OCM_EDAC_STRING, 1, 0, NULL, 0,
	edac_device_alloc_index());
	if (!dci)
	return -ENOMEM;

	priv = dci->pvt_info;
	platform_set_drvdata(pdev, dci);
	dci->dev = &pdev->dev;
	priv->baseaddr = baseaddr;
	dci->mod_name = pdev->dev.driver->name;
	dci->ctl_name = ZYNQMP_OCM_EDAC_STRING;
	dci->dev_name = dev_name(&pdev->dev);

	irq = platform_get_irq(pdev, 0);
	if (irq < 0) {
	ret = irq;
	goto free_dev_ctl;
	}

	ret = devm_request_irq(&pdev->dev, irq, intr_handler, 0,
	dev_name(&pdev->dev), dci);
	if (ret) {
	edac_printk(KERN_ERR, EDAC_DEVICE, "Failed to request Irq\n");
	goto free_dev_ctl;
	}

	/* Enable UE, CE interrupts */
	writel((OCM_CEINTR_MASK \| OCM_UEINTR_MASK), priv->baseaddr + OCM_IEN_OFST);

	#ifdef CONFIG_EDAC_DEBUG
	setup_debugfs(dci);
	#endif

	ret = edac_device_add_device(dci);
	if (ret)
	goto free_dev_ctl;

	return 0;

	free_dev_ctl:
	edac_device_free_ctl_info(dci);

	return ret;
	}

	static void edac_remove(struct platform_device *pdev)
	{
	struct edac_device_ctl_info *dci = platform_get_drvdata(pdev);
	struct edac_priv *priv = dci->pvt_info;

	/* Disable UE, CE interrupts */
	writel((OCM_CEINTR_MASK \| OCM_UEINTR_MASK), priv->baseaddr + OCM_IDS_OFST);

	#ifdef CONFIG_EDAC_DEBUG
	debugfs_remove_recursive(priv->debugfs_dir);
	#endif

	edac_device_del_device(&pdev->dev);
	edac_device_free_ctl_info(dci);
	}

	static const struct of_device_id zynqmp_ocm_edac_match[] = {
	{ .compatible = "xlnx,zynqmp-ocmc-1.0"},
	{ /* end of table */ }
	};

	MODULE_DEVICE_TABLE(of, zynqmp_ocm_edac_match);

	static struct platform_driver zynqmp_ocm_edac_driver = {
	.driver = {
	.name = "zynqmp-ocm-edac",
	.of_match_table = zynqmp_ocm_edac_match,
	},
	.probe = edac_probe,
	.remove_new = edac_remove,
	};

	module_platform_driver(zynqmp_ocm_edac_driver);

	MODULE_AUTHOR("Advanced Micro Devices, Inc");
	MODULE_DESCRIPTION("Xilinx ZynqMP OCM ECC driver");
	MODULE_LICENSE("GPL");