Date:	Sun, 27 Jul 2014 00:10:52 +0530
From:	Punnaiah Choudary Kalluri <punnaiah.choudary.kalluri@...inx.com>
To:	<dougthompson@...ssion.com>, <bp@...en8.de>, <robh+dt@...nel.org>,
	<pawel.moll@....com>, <michal.simek@...inx.com>,
	<mark.rutland@....com>, <ijc+devicetree@...lion.org.uk>,
	<galak@...eaurora.org>, <rob@...dley.net>
CC:	<devicetree@...r.kernel.org>, <linux-doc@...r.kernel.org>,
	<linux-edac@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <kpc528@...il.com>,
	<kalluripunnaiahchoudary@...il.com>, <anirudh@...inx.com>,
	<svemula@...inx.com>,
	Punnaiah Choudary Kalluri <punnaia@...inx.com>
Subject: [RFC PATCH v3] edac: synps: Added EDAC support for zynq ddr ecc controller

Added EDAC support for reporting the ecc errors of synopsys ddr controller.
The ddr ecc controller corrects single bit errors and detects double bit
errors.

Signed-off-by: Punnaiah Choudary Kalluri <punnaia@...inx.com>
---
Changes for v3:
- Updated maintainer information
- Driver cleanup as per the review comments
- Shortened the prefix "sysnopsys" to "synps"
Changes for v2:
- Updated the commit header and message
- Renamed the filenames to synopsys_edac
- Corrected the compatilble string, commnets
- Renamed the macros,fucntions and data structures
---

 .../devicetree/bindings/edac/synps_edac.txt        |   18 +
 MAINTAINERS                                        |    1 +
 drivers/edac/Kconfig                               |    7 +
 drivers/edac/Makefile                              |    1 +
 drivers/edac/synps_edac.c                          |  554 ++++++++++++++++++++
 5 files changed, 581 insertions(+), 0 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/edac/synps_edac.txt
 create mode 100644 drivers/edac/synps_edac.c

diff --git a/Documentation/devicetree/bindings/edac/synps_edac.txt b/Documentation/devicetree/bindings/edac/synps_edac.txt
new file mode 100644
index 0000000..c4a559b
--- /dev/null
+++ b/Documentation/devicetree/bindings/edac/synps_edac.txt
@@ -0,0 +1,18 @@
+Synopsys EDAC driver, it does reports the DDR ECC single bit errors that are
+corrected and double bit ecc errors that are detected by the DDR ECC controller.
+ECC support for DDR is available in half-bus width(16 bit) configuration only.
+
+Required properties:
+- compatible: Should be "xlnx,zynq-ddrc-1.04"
+- reg: Should contain DDR controller registers location and length.
+
+Example:
+++++++++
+
+ddrc0: ddrc@...06000 {
+	compatible = "xlnx,zynq-ddrc-1.04";
+	reg = <0xf8006000 0x1000>;
+};
+
+Synopsys EDAC driver detects the DDR ECC enable state by reading the appropriate
+control register.
diff --git a/MAINTAINERS b/MAINTAINERS
index d76e077..984b5a7 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1479,6 +1479,7 @@ N:	xilinx
 F:	drivers/clocksource/cadence_ttc_timer.c
 F:	drivers/i2c/busses/i2c-cadence.c
 F:	drivers/mmc/host/sdhci-of-arasan.c
+F:	drivers/edac/synps_edac.c
 
 ARM SMMU DRIVER
 M:	Will Deacon <will.deacon@....com>
diff --git a/drivers/edac/Kconfig b/drivers/edac/Kconfig
index 878f090..f628a2b 100644
--- a/drivers/edac/Kconfig
+++ b/drivers/edac/Kconfig
@@ -368,4 +368,11 @@ config EDAC_OCTEON_PCI
 	  Support for error detection and correction on the
 	  Cavium Octeon family of SOCs.
 
+config EDAC_SYNPS
+	tristate "Synopsys DDR Memory Controller"
+	depends on EDAC_MM_EDAC && ARCH_ZYNQ
+	help
+	  Support for EDAC on the ECC memory used with the Synopsys DDR
+	  memory controller.
+
 endif # EDAC
diff --git a/drivers/edac/Makefile b/drivers/edac/Makefile
index 4154ed6..0af900f 100644
--- a/drivers/edac/Makefile
+++ b/drivers/edac/Makefile
@@ -64,3 +64,4 @@ obj-$(CONFIG_EDAC_OCTEON_PC)		+= octeon_edac-pc.o
 obj-$(CONFIG_EDAC_OCTEON_L2C)		+= octeon_edac-l2c.o
 obj-$(CONFIG_EDAC_OCTEON_LMC)		+= octeon_edac-lmc.o
 obj-$(CONFIG_EDAC_OCTEON_PCI)		+= octeon_edac-pci.o
+obj-$(CONFIG_EDAC_SYNPS)		+= synps_edac.o
diff --git a/drivers/edac/synps_edac.c b/drivers/edac/synps_edac.c
new file mode 100644
index 0000000..a9417fe
--- /dev/null
+++ b/drivers/edac/synps_edac.c
@@ -0,0 +1,554 @@
+/*
+ * Synopsys DDR ECC Driver
+ * This driver is based on ppc4xx_edac.c drivers
+ *
+ * Copyright (C) 2012 - 2014 Xilinx, Inc.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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.
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details
+ */
+
+#include <linux/edac.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+#include "edac_core.h"
+
+/* Number of cs_rows needed per memory controller */
+#define SYNPS_EDAC_NR_CSROWS	1
+
+/* Number of channels per memory controller */
+#define SYNPS_EDAC_NR_CHANS	1
+
+/* Granularity of reported error in bytes */
+#define SYNPS_EDAC_ERR_GRAIN	1
+
+#define SYNPS_EDAC_MSG_SIZE	256
+
+#define SYNPS_EDAC_MOD_STRING	"synps_edac"
+#define SYNPS_EDAC_MOD_VER	"1"
+
+/* Synopsys DDR memory controller registers that are relevant to ECC */
+#define SYNPS_DDRC_CTRL_REG_OFST	0x0
+#define SYNPS_DDRC_T_ZQ_REG_OFST	0xA4
+
+/* ECC control register */
+#define SYNPS_DDRC_ECC_CTRL_REG_OFST		0xC4
+/* ECC log register */
+#define SYNPS_DDRC_ECC_CE_LOG_REG_OFST		0xC8
+/* ECC address register */
+#define SYNPS_DDRC_ECC_CE_ADDR_REG_OFST		0xCC
+/* ECC data[31:0] register */
+#define SYNPS_DDRC_ECC_CE_DATA_31_0_REG_OFST	0xD0
+
+/* Uncorrectable error info regsisters */
+#define SYNPS_DDRC_ECC_UE_LOG_REG_OFST		0xDC
+#define SYNPS_DDRC_ECC_UE_ADDR_REG_OFST		0xE0
+#define SYNPS_DDRC_ECC_UE_DATA_31_0_REG_OFST	0xE4
+
+#define SYNPS_DDRC_ECC_STAT_REG_OFST		0xF0
+#define SYNPS_DDRC_ECC_SCRUB_REG_OFST		0xF4
+
+/* Control regsiter bitfield definitions */
+#define SYNPS_DDRC_CTRLREG_BUSWIDTH_MASK	0xC
+#define SYNPS_DDRC_CTRLREG_BUSWIDTH_SHIFT	2
+
+#define SYNPS_DDRCTL_WDTH_16	1
+#define SYNPS_DDRCTL_WDTH_32	0
+
+/* ZQ register bitfield definitions */
+#define SYNPS_DDRC_T_ZQ_REG_DDRMODE_MASK	0x2
+
+/* ECC control register bitfield definitions */
+#define SYNPS_DDRC_ECCCTRL_CLR_CE_ERR		0x2
+#define SYNPS_DDRC_ECCCTRL_CLR_UE_ERR		0x1
+
+/* ECC correctable/uncorrectable error log register definitions */
+#define SYNPS_DDRC_ECC_CE_LOGREG_VALID		0x1
+#define SYNPS_DDRC_ECC_CE_LOGREG_BITPOS_MASK	0xFE
+#define SYNPS_DDRC_ECC_CE_LOGREG_BITPOS_SHIFT	1
+
+/* ECC correctable/uncorrectable error address register definitions */
+#define SYNPS_DDRC_ECC_ADDRREG_COL_MASK		0xFFF
+#define SYNPS_DDRC_ECC_ADDRREG_ROW_MASK		0xFFFF000
+#define SYNPS_DDRC_ECC_ADDRREG_ROW_SHIFT	12
+#define SYNPS_DDRC_ECC_ADDRREG_BANK_MASK	0x70000000
+#define SYNPS_DDRC_ECC_ADDRREG_BANK_SHIFT	28
+
+/* ECC statistic regsiter definitions */
+#define SYNPS_DDRC_ECC_STATREG_UECNT_MASK	0xFF
+#define SYNPS_DDRC_ECC_STATREG_CECNT_MASK	0xFF00
+#define SYNPS_DDRC_ECC_STATREG_CECNT_SHIFT	8
+
+/* ECC scrub regsiter definitions */
+#define SYNPS_DDRC_ECC_SCRUBREG_ECC_MODE_MASK	0x7
+#define SYNPS_DDRC_ECC_SCRUBREG_ECCMODE_SECDED	0x4
+
+/**
+ * struct ecc_error_info - ECC error log information
+ * @row:	Row number
+ * @col:	Column number
+ * @bank:	Bank number
+ * @bitpos:	Bit position
+ * @data:	Data causing the error
+ */
+struct ecc_error_info {
+	u32 row;
+	u32 col;
+	u32 bank;
+	u32 bitpos;
+	u32 data;
+};
+
+/**
+ * struct synps_ecc_status - ECC status information to report
+ * @ce_count:	Correctable error count
+ * @ue_count:	Uncorrectable error count
+ * @ceinfo:	Correctable error log information
+ * @ueinfo:	Uncorrectable error log information
+ */
+struct synps_ecc_status {
+	u32 ce_cnt;
+	u32 ue_cnt;
+	struct ecc_error_info ceinfo;
+	struct ecc_error_info ueinfo;
+};
+
+/**
+ * struct synps_edac_priv - DDR memory controller private instance data
+ * @baseaddr:		Base address of the DDR controller
+ * @ce_count:		Correctable Error count
+ * @ue_count:		Uncorrectable Error count
+ */
+struct synps_edac_priv {
+	void __iomem *baseaddr;
+	u32 ce_cnt;
+	u32 ue_cnt;
+};
+
+/**
+ * synps_edac_geterror_info - Get the current ecc error info
+ * @base:	Pointer to the base address of the ddr memory controller
+ * @perrstatus:	Pointer to the synopsys ecc status structure
+ *
+ * This routine determines there is any ecc error or not
+ *
+ * Return: zero if there is no error otherwise returns 1
+ */
+static int synps_edac_geterror_info(void __iomem *base,
+				    struct synps_ecc_status *p)
+{
+	u32 regval;
+	u32 clearval = 0;
+
+	regval = readl(base + SYNPS_DDRC_ECC_STAT_REG_OFST) &
+			(SYNPS_DDRC_ECC_STATREG_UECNT_MASK |
+			SYNPS_DDRC_ECC_STATREG_CECNT_MASK);
+
+	if (!regval)
+		return 0;
+
+	memset(p, 0, sizeof(*p));
+
+	p->ce_cnt = (regval & SYNPS_DDRC_ECC_STATREG_CECNT_MASK) >>
+				SYNPS_DDRC_ECC_STATREG_CECNT_SHIFT;
+	p->ue_cnt = regval & SYNPS_DDRC_ECC_STATREG_UECNT_MASK;
+
+	regval = readl(base + SYNPS_DDRC_ECC_CE_LOG_REG_OFST);
+	if (!(p->ce_cnt && (regval & SYNPS_DDRC_ECC_CE_LOGREG_VALID)))
+		goto ue_err;
+
+	p->ceinfo.bitpos = (regval & SYNPS_DDRC_ECC_CE_LOGREG_BITPOS_MASK) >>
+					SYNPS_DDRC_ECC_CE_LOGREG_BITPOS_SHIFT;
+	regval = readl(base + SYNPS_DDRC_ECC_CE_ADDR_REG_OFST);
+	p->ceinfo.row = (regval & SYNPS_DDRC_ECC_ADDRREG_ROW_MASK) >>
+					SYNPS_DDRC_ECC_ADDRREG_ROW_SHIFT;
+	p->ceinfo.col = regval & SYNPS_DDRC_ECC_ADDRREG_COL_MASK;
+	p->ceinfo.bank = (regval & SYNPS_DDRC_ECC_ADDRREG_BANK_MASK) >>
+					SYNPS_DDRC_ECC_ADDRREG_BANK_SHIFT;
+	p->ceinfo.data = readl(base + SYNPS_DDRC_ECC_CE_DATA_31_0_REG_OFST);
+	edac_dbg(3, "ce bitposition: %d data: %d\n", p->ceinfo.bitpos,
+						p->ceinfo.data);
+	clearval = SYNPS_DDRC_ECCCTRL_CLR_CE_ERR;
+
+ue_err:
+	regval = readl(base + SYNPS_DDRC_ECC_UE_LOG_REG_OFST);
+	if (!(p->ue_cnt && (regval & SYNPS_DDRC_ECC_CE_LOGREG_VALID)))
+		goto out;
+
+	regval = readl(base + SYNPS_DDRC_ECC_UE_ADDR_REG_OFST);
+	p->ueinfo.row = (regval & SYNPS_DDRC_ECC_ADDRREG_ROW_MASK) >>
+					SYNPS_DDRC_ECC_ADDRREG_ROW_SHIFT;
+	p->ueinfo.col = regval & SYNPS_DDRC_ECC_ADDRREG_COL_MASK;
+	p->ueinfo.bank = (regval & SYNPS_DDRC_ECC_ADDRREG_BANK_MASK) >>
+					SYNPS_DDRC_ECC_ADDRREG_BANK_SHIFT;
+	p->ueinfo.data = readl(base + SYNPS_DDRC_ECC_UE_DATA_31_0_REG_OFST);
+	clearval |= SYNPS_DDRC_ECCCTRL_CLR_UE_ERR;
+
+out:
+	writel(clearval, base + SYNPS_DDRC_ECC_CTRL_REG_OFST);
+	writel(0x0, base + SYNPS_DDRC_ECC_CTRL_REG_OFST);
+
+	return 1;
+}
+
+/**
+ * synps_edac_handle_error - Handle controller error types CE and UE
+ * @mci:	Pointer to the edac memory controller instance
+ * @perrstatus:	Pointer to the synopsys ecc status structure
+ *
+ * This routine handles the controller ECC correctable and un correctable
+ * error.
+ */
+static void synps_edac_handle_error(struct mem_ctl_info *mci,
+				    struct synps_ecc_status *p)
+{
+	char message[SYNPS_EDAC_MSG_SIZE];
+	struct ecc_error_info *pinf;
+
+	if (p->ce_cnt) {
+		pinf = &p->ceinfo;
+		snprintf(message, SYNPS_EDAC_MSG_SIZE,
+			 "DDR ECC error type :%s Row %d Bank %d Col %d ",
+			 "CE", pinf->row, pinf->bank, pinf->col);
+		edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci,
+				     p->ce_cnt, 0, 0, 0, 0, 0, -1,
+				     message, "");
+	}
+
+	if (p->ue_cnt) {
+		pinf = &p->ueinfo;
+		snprintf(message, SYNPS_EDAC_MSG_SIZE,
+			 "DDR ECC error type :%s Row %d Bank %d Col %d ",
+			 "UE", pinf->row, pinf->bank, pinf->col);
+		edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci,
+				     p->ue_cnt, 0, 0, 0, 0, 0, -1,
+				     message, "");
+	}
+}
+
+/**
+ * synps_edac_check - Check controller for ECC errors
+ * @mci:	Pointer to the edac memory controller instance
+ *
+ * This routine is used to check and post ECC errors and is called by
+ * the EDAC polling thread
+ */
+static void synps_edac_check(struct mem_ctl_info *mci)
+{
+	struct synps_edac_priv *priv = mci->pvt_info;
+	struct synps_ecc_status stat;
+	int status;
+
+	status = synps_edac_geterror_info(priv->baseaddr, &stat);
+	if (!status)
+		return;
+
+	priv->ce_cnt += stat.ce_cnt;
+	priv->ue_cnt += stat.ue_cnt;
+	synps_edac_handle_error(mci, &stat);
+
+	edac_dbg(3, "Total error count ce %d ue %d\n",
+			 priv->ce_cnt, priv->ue_cnt);
+}
+
+/**
+ * synps_edac_get_dtype - Return the controller memory width
+ * @base:	Pointer to the ddr memory contoller base address
+ *
+ * This routine returns the EDAC device type width appropriate for the
+ * current controller configuration.
+ *
+ * Return: a device type width enumeration.
+ */
+static enum dev_type synps_edac_get_dtype(const void __iomem *base)
+{
+	enum dev_type dt;
+	u32 width;
+
+	width = readl(base + SYNPS_DDRC_CTRL_REG_OFST);
+	width = (width & SYNPS_DDRC_CTRLREG_BUSWIDTH_MASK) >>
+			SYNPS_DDRC_CTRLREG_BUSWIDTH_SHIFT;
+
+	switch (width) {
+	case SYNPS_DDRCTL_WDTH_16:
+		dt = DEV_X2;
+		break;
+	case SYNPS_DDRCTL_WDTH_32:
+		dt = DEV_X4;
+		break;
+	default:
+		dt = DEV_UNKNOWN;
+	}
+
+	return dt;
+}
+
+/**
+ * synps_edac_get_eccstate - Return the controller ecc enable/disable status
+ * @base:	Pointer to the ddr memory contoller base address
+ *
+ * This routine returns the ECC enable/diable status for the controller
+ *
+ * Return: a ecc status boolean i.e true/false - enabled/disabled.
+ */
+static bool synps_edac_get_eccstate(void __iomem *base)
+{
+	enum dev_type dt;
+	u32 ecctype;
+	bool state = false;
+
+	dt = synps_edac_get_dtype(base);
+	if (dt == DEV_UNKNOWN)
+		return state;
+
+	ecctype = (readl(base + SYNPS_DDRC_ECC_SCRUB_REG_OFST) &
+			SYNPS_DDRC_ECC_SCRUBREG_ECC_MODE_MASK);
+
+	if ((ecctype == SYNPS_DDRC_ECC_SCRUBREG_ECCMODE_SECDED)
+			&& (dt == DEV_X2)) {
+		state = true;
+		writel(0x0, base + SYNPS_DDRC_ECC_CTRL_REG_OFST);
+	}
+
+	return state;
+}
+
+/**
+ * synps_edac_get_memsize - reads the size of the attached memory device
+ *
+ * Return: the memory size in bytes
+ */
+static u32 synps_edac_get_memsize(void)
+{
+	struct sysinfo inf;
+
+	si_meminfo(&inf);
+
+	return inf.totalram * inf.mem_unit;
+}
+
+/**
+ * synps_edac_get_mtype - Returns controller memory type
+ * @base:	pointer to the synopsys ecc status structure
+ *
+ * This routine returns the EDAC memory type appropriate for the
+ * current controller configuration.
+ *
+ * Return: a memory type enumeration.
+ */
+static enum mem_type synps_edac_get_mtype(const void __iomem *base)
+{
+	enum mem_type mt;
+	u32 memtype;
+
+	memtype = readl(base + SYNPS_DDRC_T_ZQ_REG_OFST);
+
+	if (memtype & SYNPS_DDRC_T_ZQ_REG_DDRMODE_MASK)
+		mt = MEM_DDR3;
+	else
+		mt = MEM_DDR2;
+
+	return mt;
+}
+
+/**
+ * synps_edac_init_csrows - Initialize the cs row data
+ * @mci:	Pointer to the edac memory controller instance
+ *
+ * This routine initializes the chip select rows associated
+ * with the EDAC memory controller instance
+ *
+ * Return: Unconditionally 0.
+ */
+static int synps_edac_init_csrows(struct mem_ctl_info *mci)
+{
+	struct csrow_info *csi;
+	struct dimm_info *dimm;
+	struct synps_edac_priv *priv = mci->pvt_info;
+	u32 size;
+	int row, j;
+
+	for (row = 0; row < mci->nr_csrows; row++) {
+		csi = mci->csrows[row];
+		size = synps_edac_get_memsize();
+
+		for (j = 0; j < csi->nr_channels; j++) {
+			dimm = csi->channels[j]->dimm;
+			dimm->edac_mode = EDAC_FLAG_SECDED;
+			dimm->mtype = synps_edac_get_mtype(priv->baseaddr);
+			dimm->nr_pages =
+			    (size >> PAGE_SHIFT) / csi->nr_channels;
+			dimm->grain = SYNPS_EDAC_ERR_GRAIN;
+			dimm->dtype = synps_edac_get_dtype(priv->baseaddr);
+		}
+	}
+
+	return 0;
+}
+
+/**
+ * synps_edac_mc_init - Initialize driver instance
+ * @mci:	Pointer to the edac memory controller instance
+ * @pdev:	Pointer to the platform_device struct
+ *
+ * This routine performs initialization of the EDAC memory controller
+ * instance and related driver-private data associated with the
+ * memory controller the instance is bound to.
+ *
+ * Return: 0 if OK; otherwise, < 0 on error.
+ */
+static int synps_edac_mc_init(struct mem_ctl_info *mci,
+				 struct platform_device *pdev)
+{
+	int status;
+	struct synps_edac_priv *priv;
+
+	mci->pdev = &pdev->dev;
+	priv = mci->pvt_info;
+	platform_set_drvdata(pdev, mci);
+
+	/* Initialize controller capabilities and configuration */
+	mci->mtype_cap = MEM_FLAG_DDR3 | MEM_FLAG_DDR2;
+	mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_SECDED;
+	mci->scrub_cap = SCRUB_HW_SRC;
+	mci->scrub_mode = SCRUB_NONE;
+
+	mci->edac_cap = EDAC_FLAG_SECDED;
+	mci->ctl_name = "synps_ddr_controller";
+	mci->dev_name = SYNPS_EDAC_MOD_STRING;
+	mci->mod_name = SYNPS_EDAC_MOD_VER;
+	mci->mod_ver = "1";
+
+	edac_op_state = EDAC_OPSTATE_POLL;
+	mci->edac_check = synps_edac_check;
+	mci->ctl_page_to_phys = NULL;
+
+	/*
+	 * Initialize the MC control structure 'csrows' table
+	 * with the mapping and control information.
+	 */
+	status = synps_edac_init_csrows(mci);
+
+	return status;
+}
+
+/**
+ * synps_edac_mc_probe - Check controller and bind driver
+ * @pdev:	Pointer to the platform_device struct
+ *
+ * This routine probes a specific controller
+ * instance for binding with the driver.
+ *
+ * Return: 0 if the controller instance was successfully bound to the
+ * driver; otherwise, < 0 on error.
+ */
+static int synps_edac_mc_probe(struct platform_device *pdev)
+{
+	struct mem_ctl_info *mci;
+	struct edac_mc_layer layers[2];
+	struct synps_edac_priv *priv;
+	int rc;
+	struct resource *res;
+	void __iomem *baseaddr;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	baseaddr = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(baseaddr))
+		return PTR_ERR(baseaddr);
+
+	if (synps_edac_get_eccstate(baseaddr) == false) {
+		edac_printk(KERN_INFO, EDAC_MC, "ECC not enabled\n");
+		return -ENXIO;
+	}
+
+	layers[0].type = EDAC_MC_LAYER_CHIP_SELECT;
+	layers[0].size = SYNPS_EDAC_NR_CSROWS;
+	layers[0].is_virt_csrow = true;
+	layers[1].type = EDAC_MC_LAYER_CHANNEL;
+	layers[1].size = SYNPS_EDAC_NR_CHANS;
+	layers[1].is_virt_csrow = false;
+
+	mci = edac_mc_alloc(0, ARRAY_SIZE(layers), layers,
+			    sizeof(struct synps_edac_priv));
+	if (!mci) {
+		edac_printk(KERN_ERR, EDAC_MC,
+			"Failed memory allocation for mc instance\n");
+		return -ENOMEM;
+	}
+
+	priv = mci->pvt_info;
+	priv->baseaddr = baseaddr;
+	rc = synps_edac_mc_init(mci, pdev);
+	if (rc) {
+		edac_printk(KERN_ERR, EDAC_MC,
+			"Failed to initialize instance\n");
+		goto free_edac_mc;
+	}
+
+	rc = edac_mc_add_mc(mci);
+	if (rc) {
+		edac_printk(KERN_ERR, EDAC_MC,
+			"Failed to register with EDAC core\n");
+		goto del_edac_mc;
+	}
+
+	return rc;
+
+del_edac_mc:
+	edac_mc_del_mc(&pdev->dev);
+free_edac_mc:
+	edac_mc_free(mci);
+
+	return rc;
+}
+
+/**
+ * synps_edac_mc_remove - Unbind driver from controller
+ * @pdev:	Pointer to the platform_device struct
+ *
+ * Return: Unconditionally 0
+ */
+static int synps_edac_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 struct of_device_id synps_edac_match[] = {
+	{ .compatible = "xlnx,zynq-ddrc-1.04", },
+	{ /* end of table */ }
+};
+
+MODULE_DEVICE_TABLE(of, synps_edac_match);
+
+static struct platform_driver synps_edac_mc_driver = {
+	.driver = {
+		   .name = "synps-edac",
+		   .owner = THIS_MODULE,
+		   .of_match_table = synps_edac_match,
+		   },
+	.probe = synps_edac_mc_probe,
+	.remove = synps_edac_mc_remove,
+};
+
+module_platform_driver(synps_edac_mc_driver);
+
+MODULE_AUTHOR("Xilinx Inc");
+MODULE_DESCRIPTION("Synopsys DDR ECC driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.4


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