Adding upstream version 5.10.209.upstream/5.10.209upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1432 insertions, 0 deletions

diff --git a/drivers/edac/ppc4xx_edac.c b/drivers/edac/ppc4xx_edac.c
new file mode 100644
index 000000000..677095769
--- /dev/null
+++ b/drivers/edac/ppc4xx_edac.c
@@ -0,0 +1,1432 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2008 Nuovation System Designs, LLC
+ *   Grant Erickson <gerickson@nuovations.com>
+ */
+
+#include <linux/edac.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/of_platform.h>
+#include <linux/types.h>
+
+#include <asm/dcr.h>
+
+#include "edac_module.h"
+#include "ppc4xx_edac.h"
+
+/*
+ * This file implements a driver for monitoring and handling events
+ * associated with the IMB DDR2 ECC controller found in the AMCC/IBM
+ * 405EX[r], 440SP, 440SPe, 460EX, 460GT and 460SX.
+ *
+ * As realized in the 405EX[r], this controller features:
+ *
+ *   - Support for registered- and non-registered DDR1 and DDR2 memory.
+ *   - 32-bit or 16-bit memory interface with optional ECC.
+ *
+ *     o ECC support includes:
+ *
+ *       - 4-bit SEC/DED
+ *       - Aligned-nibble error detect
+ *       - Bypass mode
+ *
+ *   - Two (2) memory banks/ranks.
+ *   - Up to 1 GiB per bank/rank in 32-bit mode and up to 512 MiB per
+ *     bank/rank in 16-bit mode.
+ *
+ * As realized in the 440SP and 440SPe, this controller changes/adds:
+ *
+ *   - 64-bit or 32-bit memory interface with optional ECC.
+ *
+ *     o ECC support includes:
+ *
+ *       - 8-bit SEC/DED
+ *       - Aligned-nibble error detect
+ *       - Bypass mode
+ *
+ *   - Up to 4 GiB per bank/rank in 64-bit mode and up to 2 GiB
+ *     per bank/rank in 32-bit mode.
+ *
+ * As realized in the 460EX and 460GT, this controller changes/adds:
+ *
+ *   - 64-bit or 32-bit memory interface with optional ECC.
+ *
+ *     o ECC support includes:
+ *
+ *       - 8-bit SEC/DED
+ *       - Aligned-nibble error detect
+ *       - Bypass mode
+ *
+ *   - Four (4) memory banks/ranks.
+ *   - Up to 16 GiB per bank/rank in 64-bit mode and up to 8 GiB
+ *     per bank/rank in 32-bit mode.
+ *
+ * At present, this driver has ONLY been tested against the controller
+ * realization in the 405EX[r] on the AMCC Kilauea and Haleakala
+ * boards (256 MiB w/o ECC memory soldered onto the board) and a
+ * proprietary board based on those designs (128 MiB ECC memory, also
+ * soldered onto the board).
+ *
+ * Dynamic feature detection and handling needs to be added for the
+ * other realizations of this controller listed above.
+ *
+ * Eventually, this driver will likely be adapted to the above variant
+ * realizations of this controller as well as broken apart to handle
+ * the other known ECC-capable controllers prevalent in other 4xx
+ * processors:
+ *
+ *   - IBM SDRAM (405GP, 405CR and 405EP) "ibm,sdram-4xx"
+ *   - IBM DDR1 (440GP, 440GX, 440EP and 440GR) "ibm,sdram-4xx-ddr"
+ *   - Denali DDR1/DDR2 (440EPX and 440GRX) "denali,sdram-4xx-ddr2"
+ *
+ * For this controller, unfortunately, correctable errors report
+ * nothing more than the beat/cycle and byte/lane the correction
+ * occurred on and the check bit group that covered the error.
+ *
+ * In contrast, uncorrectable errors also report the failing address,
+ * the bus master and the transaction direction (i.e. read or write)
+ *
+ * Regardless of whether the error is a CE or a UE, we report the
+ * following pieces of information in the driver-unique message to the
+ * EDAC subsystem:
+ *
+ *   - Device tree path
+ *   - Bank(s)
+ *   - Check bit error group
+ *   - Beat(s)/lane(s)
+ */
+
+/* Preprocessor Definitions */
+
+#define EDAC_OPSTATE_INT_STR		"interrupt"
+#define EDAC_OPSTATE_POLL_STR		"polled"
+#define EDAC_OPSTATE_UNKNOWN_STR	"unknown"
+
+#define PPC4XX_EDAC_MODULE_NAME		"ppc4xx_edac"
+#define PPC4XX_EDAC_MODULE_REVISION	"v1.0.0"
+
+#define PPC4XX_EDAC_MESSAGE_SIZE	256
+
+/*
+ * Kernel logging without an EDAC instance
+ */
+#define ppc4xx_edac_printk(level, fmt, arg...) \
+	edac_printk(level, "PPC4xx MC", fmt, ##arg)
+
+/*
+ * Kernel logging with an EDAC instance
+ */
+#define ppc4xx_edac_mc_printk(level, mci, fmt, arg...) \
+	edac_mc_chipset_printk(mci, level, "PPC4xx", fmt, ##arg)
+
+/*
+ * Macros to convert bank configuration size enumerations into MiB and
+ * page values.
+ */
+#define SDRAM_MBCF_SZ_MiB_MIN		4
+#define SDRAM_MBCF_SZ_TO_MiB(n)		(SDRAM_MBCF_SZ_MiB_MIN \
+					 << (SDRAM_MBCF_SZ_DECODE(n)))
+#define SDRAM_MBCF_SZ_TO_PAGES(n)	(SDRAM_MBCF_SZ_MiB_MIN \
+					 << (20 - PAGE_SHIFT + \
+					     SDRAM_MBCF_SZ_DECODE(n)))
+
+/*
+ * The ibm,sdram-4xx-ddr2 Device Control Registers (DCRs) are
+ * indirectly accessed and have a base and length defined by the
+ * device tree. The base can be anything; however, we expect the
+ * length to be precisely two registers, the first for the address
+ * window and the second for the data window.
+ */
+#define SDRAM_DCR_RESOURCE_LEN		2
+#define SDRAM_DCR_ADDR_OFFSET		0
+#define SDRAM_DCR_DATA_OFFSET		1
+
+/*
+ * Device tree interrupt indices
+ */
+#define INTMAP_ECCDED_INDEX		0	/* Double-bit Error Detect */
+#define INTMAP_ECCSEC_INDEX		1	/* Single-bit Error Correct */
+
+/* Type Definitions */
+
+/*
+ * PPC4xx SDRAM memory controller private instance data
+ */
+struct ppc4xx_edac_pdata {
+	dcr_host_t dcr_host;	/* Indirect DCR address/data window mapping */
+	struct {
+		int sec;	/* Single-bit correctable error IRQ assigned */
+		int ded;	/* Double-bit detectable error IRQ assigned */
+	} irqs;
+};
+
+/*
+ * Various status data gathered and manipulated when checking and
+ * reporting ECC status.
+ */
+struct ppc4xx_ecc_status {
+	u32 ecces;
+	u32 besr;
+	u32 bearh;
+	u32 bearl;
+	u32 wmirq;
+};
+
+/* Function Prototypes */
+
+static int ppc4xx_edac_probe(struct platform_device *device);
+static int ppc4xx_edac_remove(struct platform_device *device);
+
+/* Global Variables */
+
+/*
+ * Device tree node type and compatible tuples this driver can match
+ * on.
+ */
+static const struct of_device_id ppc4xx_edac_match[] = {
+	{
+		.compatible	= "ibm,sdram-4xx-ddr2"
+	},
+	{ }
+};
+MODULE_DEVICE_TABLE(of, ppc4xx_edac_match);
+
+static struct platform_driver ppc4xx_edac_driver = {
+	.probe			= ppc4xx_edac_probe,
+	.remove			= ppc4xx_edac_remove,
+	.driver = {
+		.name = PPC4XX_EDAC_MODULE_NAME,
+		.of_match_table = ppc4xx_edac_match,
+	},
+};
+
+/*
+ * TODO: The row and channel parameters likely need to be dynamically
+ * set based on the aforementioned variant controller realizations.
+ */
+static const unsigned ppc4xx_edac_nr_csrows = 2;
+static const unsigned ppc4xx_edac_nr_chans = 1;
+
+/*
+ * Strings associated with PLB master IDs capable of being posted in
+ * SDRAM_BESR or SDRAM_WMIRQ on uncorrectable ECC errors.
+ */
+static const char * const ppc4xx_plb_masters[9] = {
+	[SDRAM_PLB_M0ID_ICU]	= "ICU",
+	[SDRAM_PLB_M0ID_PCIE0]	= "PCI-E 0",
+	[SDRAM_PLB_M0ID_PCIE1]	= "PCI-E 1",
+	[SDRAM_PLB_M0ID_DMA]	= "DMA",
+	[SDRAM_PLB_M0ID_DCU]	= "DCU",
+	[SDRAM_PLB_M0ID_OPB]	= "OPB",
+	[SDRAM_PLB_M0ID_MAL]	= "MAL",
+	[SDRAM_PLB_M0ID_SEC]	= "SEC",
+	[SDRAM_PLB_M0ID_AHB]	= "AHB"
+};
+
+/**
+ * mfsdram - read and return controller register data
+ * @dcr_host: A pointer to the DCR mapping.
+ * @idcr_n: The indirect DCR register to read.
+ *
+ * This routine reads and returns the data associated with the
+ * controller's specified indirect DCR register.
+ *
+ * Returns the read data.
+ */
+static inline u32
+mfsdram(const dcr_host_t *dcr_host, unsigned int idcr_n)
+{
+	return __mfdcri(dcr_host->base + SDRAM_DCR_ADDR_OFFSET,
+			dcr_host->base + SDRAM_DCR_DATA_OFFSET,
+			idcr_n);
+}
+
+/**
+ * mtsdram - write controller register data
+ * @dcr_host: A pointer to the DCR mapping.
+ * @idcr_n: The indirect DCR register to write.
+ * @value: The data to write.
+ *
+ * This routine writes the provided data to the controller's specified
+ * indirect DCR register.
+ */
+static inline void
+mtsdram(const dcr_host_t *dcr_host, unsigned int idcr_n, u32 value)
+{
+	return __mtdcri(dcr_host->base + SDRAM_DCR_ADDR_OFFSET,
+			dcr_host->base + SDRAM_DCR_DATA_OFFSET,
+			idcr_n,
+			value);
+}
+
+/**
+ * ppc4xx_edac_check_bank_error - check a bank for an ECC bank error
+ * @status: A pointer to the ECC status structure to check for an
+ *          ECC bank error.
+ * @bank: The bank to check for an ECC error.
+ *
+ * This routine determines whether the specified bank has an ECC
+ * error.
+ *
+ * Returns true if the specified bank has an ECC error; otherwise,
+ * false.
+ */
+static bool
+ppc4xx_edac_check_bank_error(const struct ppc4xx_ecc_status *status,
+			     unsigned int bank)
+{
+	switch (bank) {
+	case 0:
+		return status->ecces & SDRAM_ECCES_BK0ER;
+	case 1:
+		return status->ecces & SDRAM_ECCES_BK1ER;
+	default:
+		return false;
+	}
+}
+
+/**
+ * ppc4xx_edac_generate_bank_message - generate interpretted bank status message
+ * @mci: A pointer to the EDAC memory controller instance associated
+ *       with the bank message being generated.
+ * @status: A pointer to the ECC status structure to generate the
+ *          message from.
+ * @buffer: A pointer to the buffer in which to generate the
+ *          message.
+ * @size: The size, in bytes, of space available in buffer.
+ *
+ * This routine generates to the provided buffer the portion of the
+ * driver-unique report message associated with the ECCESS[BKNER]
+ * field of the specified ECC status.
+ *
+ * Returns the number of characters generated on success; otherwise, <
+ * 0 on error.
+ */
+static int
+ppc4xx_edac_generate_bank_message(const struct mem_ctl_info *mci,
+				  const struct ppc4xx_ecc_status *status,
+				  char *buffer,
+				  size_t size)
+{
+	int n, total = 0;
+	unsigned int row, rows;
+
+	n = snprintf(buffer, size, "%s: Banks: ", mci->dev_name);
+
+	if (n < 0 || n >= size)
+		goto fail;
+
+	buffer += n;
+	size -= n;
+	total += n;
+
+	for (rows = 0, row = 0; row < mci->nr_csrows; row++) {
+		if (ppc4xx_edac_check_bank_error(status, row)) {
+			n = snprintf(buffer, size, "%s%u",
+					(rows++ ? ", " : ""), row);
+
+			if (n < 0 || n >= size)
+				goto fail;
+
+			buffer += n;
+			size -= n;
+			total += n;
+		}
+	}
+
+	n = snprintf(buffer, size, "%s; ", rows ? "" : "None");
+
+	if (n < 0 || n >= size)
+		goto fail;
+
+	buffer += n;
+	size -= n;
+	total += n;
+
+ fail:
+	return total;
+}
+
+/**
+ * ppc4xx_edac_generate_checkbit_message - generate interpretted checkbit message
+ * @mci: A pointer to the EDAC memory controller instance associated
+ *       with the checkbit message being generated.
+ * @status: A pointer to the ECC status structure to generate the
+ *          message from.
+ * @buffer: A pointer to the buffer in which to generate the
+ *          message.
+ * @size: The size, in bytes, of space available in buffer.
+ *
+ * This routine generates to the provided buffer the portion of the
+ * driver-unique report message associated with the ECCESS[CKBER]
+ * field of the specified ECC status.
+ *
+ * Returns the number of characters generated on success; otherwise, <
+ * 0 on error.
+ */
+static int
+ppc4xx_edac_generate_checkbit_message(const struct mem_ctl_info *mci,
+				      const struct ppc4xx_ecc_status *status,
+				      char *buffer,
+				      size_t size)
+{
+	const struct ppc4xx_edac_pdata *pdata = mci->pvt_info;
+	const char *ckber = NULL;
+
+	switch (status->ecces & SDRAM_ECCES_CKBER_MASK) {
+	case SDRAM_ECCES_CKBER_NONE:
+		ckber = "None";
+		break;
+	case SDRAM_ECCES_CKBER_32_ECC_0_3:
+		ckber = "ECC0:3";
+		break;
+	case SDRAM_ECCES_CKBER_32_ECC_4_8:
+		switch (mfsdram(&pdata->dcr_host, SDRAM_MCOPT1) &
+			SDRAM_MCOPT1_WDTH_MASK) {
+		case SDRAM_MCOPT1_WDTH_16:
+			ckber = "ECC0:3";
+			break;
+		case SDRAM_MCOPT1_WDTH_32:
+			ckber = "ECC4:8";
+			break;
+		default:
+			ckber = "Unknown";
+			break;
+		}
+		break;
+	case SDRAM_ECCES_CKBER_32_ECC_0_8:
+		ckber = "ECC0:8";
+		break;
+	default:
+		ckber = "Unknown";
+		break;
+	}
+
+	return snprintf(buffer, size, "Checkbit Error: %s", ckber);
+}
+
+/**
+ * ppc4xx_edac_generate_lane_message - generate interpretted byte lane message
+ * @mci: A pointer to the EDAC memory controller instance associated
+ *       with the byte lane message being generated.
+ * @status: A pointer to the ECC status structure to generate the
+ *          message from.
+ * @buffer: A pointer to the buffer in which to generate the
+ *          message.
+ * @size: The size, in bytes, of space available in buffer.
+ *
+ * This routine generates to the provided buffer the portion of the
+ * driver-unique report message associated with the ECCESS[BNCE]
+ * field of the specified ECC status.
+ *
+ * Returns the number of characters generated on success; otherwise, <
+ * 0 on error.
+ */
+static int
+ppc4xx_edac_generate_lane_message(const struct mem_ctl_info *mci,
+				  const struct ppc4xx_ecc_status *status,
+				  char *buffer,
+				  size_t size)
+{
+	int n, total = 0;
+	unsigned int lane, lanes;
+	const unsigned int first_lane = 0;
+	const unsigned int lane_count = 16;
+
+	n = snprintf(buffer, size, "; Byte Lane Errors: ");
+
+	if (n < 0 || n >= size)
+		goto fail;
+
+	buffer += n;
+	size -= n;
+	total += n;
+
+	for (lanes = 0, lane = first_lane; lane < lane_count; lane++) {
+		if ((status->ecces & SDRAM_ECCES_BNCE_ENCODE(lane)) != 0) {
+			n = snprintf(buffer, size,
+				     "%s%u",
+				     (lanes++ ? ", " : ""), lane);
+
+			if (n < 0 || n >= size)
+				goto fail;
+
+			buffer += n;
+			size -= n;
+			total += n;
+		}
+	}
+
+	n = snprintf(buffer, size, "%s; ", lanes ? "" : "None");
+
+	if (n < 0 || n >= size)
+		goto fail;
+
+	buffer += n;
+	size -= n;
+	total += n;
+
+ fail:
+	return total;
+}
+
+/**
+ * ppc4xx_edac_generate_ecc_message - generate interpretted ECC status message
+ * @mci: A pointer to the EDAC memory controller instance associated
+ *       with the ECCES message being generated.
+ * @status: A pointer to the ECC status structure to generate the
+ *          message from.
+ * @buffer: A pointer to the buffer in which to generate the
+ *          message.
+ * @size: The size, in bytes, of space available in buffer.
+ *
+ * This routine generates to the provided buffer the portion of the
+ * driver-unique report message associated with the ECCESS register of
+ * the specified ECC status.
+ *
+ * Returns the number of characters generated on success; otherwise, <
+ * 0 on error.
+ */
+static int
+ppc4xx_edac_generate_ecc_message(const struct mem_ctl_info *mci,
+				 const struct ppc4xx_ecc_status *status,
+				 char *buffer,
+				 size_t size)
+{
+	int n, total = 0;
+
+	n = ppc4xx_edac_generate_bank_message(mci, status, buffer, size);
+
+	if (n < 0 || n >= size)
+		goto fail;
+
+	buffer += n;
+	size -= n;
+	total += n;
+
+	n = ppc4xx_edac_generate_checkbit_message(mci, status, buffer, size);
+
+	if (n < 0 || n >= size)
+		goto fail;
+
+	buffer += n;
+	size -= n;
+	total += n;
+
+	n = ppc4xx_edac_generate_lane_message(mci, status, buffer, size);
+
+	if (n < 0 || n >= size)
+		goto fail;
+
+	buffer += n;
+	size -= n;
+	total += n;
+
+ fail:
+	return total;
+}
+
+/**
+ * ppc4xx_edac_generate_plb_message - generate interpretted PLB status message
+ * @mci: A pointer to the EDAC memory controller instance associated
+ *       with the PLB message being generated.
+ * @status: A pointer to the ECC status structure to generate the
+ *          message from.
+ * @buffer: A pointer to the buffer in which to generate the
+ *          message.
+ * @size: The size, in bytes, of space available in buffer.
+ *
+ * This routine generates to the provided buffer the portion of the
+ * driver-unique report message associated with the PLB-related BESR
+ * and/or WMIRQ registers of the specified ECC status.
+ *
+ * Returns the number of characters generated on success; otherwise, <
+ * 0 on error.
+ */
+static int
+ppc4xx_edac_generate_plb_message(const struct mem_ctl_info *mci,
+				 const struct ppc4xx_ecc_status *status,
+				 char *buffer,
+				 size_t size)
+{
+	unsigned int master;
+	bool read;
+
+	if ((status->besr & SDRAM_BESR_MASK) == 0)
+		return 0;
+
+	if ((status->besr & SDRAM_BESR_M0ET_MASK) == SDRAM_BESR_M0ET_NONE)
+		return 0;
+
+	read = ((status->besr & SDRAM_BESR_M0RW_MASK) == SDRAM_BESR_M0RW_READ);
+
+	master = SDRAM_BESR_M0ID_DECODE(status->besr);
+
+	return snprintf(buffer, size,
+			"%s error w/ PLB master %u \"%s\"; ",
+			(read ? "Read" : "Write"),
+			master,
+			(((master >= SDRAM_PLB_M0ID_FIRST) &&
+			  (master <= SDRAM_PLB_M0ID_LAST)) ?
+			 ppc4xx_plb_masters[master] : "UNKNOWN"));
+}
+
+/**
+ * ppc4xx_edac_generate_message - generate interpretted status message
+ * @mci: A pointer to the EDAC memory controller instance associated
+ *       with the driver-unique message being generated.
+ * @status: A pointer to the ECC status structure to generate the
+ *          message from.
+ * @buffer: A pointer to the buffer in which to generate the
+ *          message.
+ * @size: The size, in bytes, of space available in buffer.
+ *
+ * This routine generates to the provided buffer the driver-unique
+ * EDAC report message from the specified ECC status.
+ */
+static void
+ppc4xx_edac_generate_message(const struct mem_ctl_info *mci,
+			     const struct ppc4xx_ecc_status *status,
+			     char *buffer,
+			     size_t size)
+{
+	int n;
+
+	if (buffer == NULL || size == 0)
+		return;
+
+	n = ppc4xx_edac_generate_ecc_message(mci, status, buffer, size);
+
+	if (n < 0 || n >= size)
+		return;
+
+	buffer += n;
+	size -= n;
+
+	ppc4xx_edac_generate_plb_message(mci, status, buffer, size);
+}
+
+#ifdef DEBUG
+/**
+ * ppc4xx_ecc_dump_status - dump controller ECC status registers
+ * @mci: A pointer to the EDAC memory controller instance
+ *       associated with the status being dumped.
+ * @status: A pointer to the ECC status structure to generate the
+ *          dump from.
+ *
+ * This routine dumps to the kernel log buffer the raw and
+ * interpretted specified ECC status.
+ */
+static void
+ppc4xx_ecc_dump_status(const struct mem_ctl_info *mci,
+		       const struct ppc4xx_ecc_status *status)
+{
+	char message[PPC4XX_EDAC_MESSAGE_SIZE];
+
+	ppc4xx_edac_generate_message(mci, status, message, sizeof(message));
+
+	ppc4xx_edac_mc_printk(KERN_INFO, mci,
+			      "\n"
+			      "\tECCES: 0x%08x\n"
+			      "\tWMIRQ: 0x%08x\n"
+			      "\tBESR:  0x%08x\n"
+			      "\tBEAR:  0x%08x%08x\n"
+			      "\t%s\n",
+			      status->ecces,
+			      status->wmirq,
+			      status->besr,
+			      status->bearh,
+			      status->bearl,
+			      message);
+}
+#endif /* DEBUG */
+
+/**
+ * ppc4xx_ecc_get_status - get controller ECC status
+ * @mci: A pointer to the EDAC memory controller instance
+ *       associated with the status being retrieved.
+ * @status: A pointer to the ECC status structure to populate the
+ *          ECC status with.
+ *
+ * This routine reads and masks, as appropriate, all the relevant
+ * status registers that deal with ibm,sdram-4xx-ddr2 ECC errors.
+ * While we read all of them, for correctable errors, we only expect
+ * to deal with ECCES. For uncorrectable errors, we expect to deal
+ * with all of them.
+ */
+static void
+ppc4xx_ecc_get_status(const struct mem_ctl_info *mci,
+		      struct ppc4xx_ecc_status *status)
+{
+	const struct ppc4xx_edac_pdata *pdata = mci->pvt_info;
+	const dcr_host_t *dcr_host = &pdata->dcr_host;
+
+	status->ecces = mfsdram(dcr_host, SDRAM_ECCES) & SDRAM_ECCES_MASK;
+	status->wmirq = mfsdram(dcr_host, SDRAM_WMIRQ) & SDRAM_WMIRQ_MASK;
+	status->besr  = mfsdram(dcr_host, SDRAM_BESR)  & SDRAM_BESR_MASK;
+	status->bearl = mfsdram(dcr_host, SDRAM_BEARL);
+	status->bearh = mfsdram(dcr_host, SDRAM_BEARH);
+}
+
+/**
+ * ppc4xx_ecc_clear_status - clear controller ECC status
+ * @mci: A pointer to the EDAC memory controller instance
+ *       associated with the status being cleared.
+ * @status: A pointer to the ECC status structure containing the
+ *          values to write to clear the ECC status.
+ *
+ * This routine clears--by writing the masked (as appropriate) status
+ * values back to--the status registers that deal with
+ * ibm,sdram-4xx-ddr2 ECC errors.
+ */
+static void
+ppc4xx_ecc_clear_status(const struct mem_ctl_info *mci,
+			const struct ppc4xx_ecc_status *status)
+{
+	const struct ppc4xx_edac_pdata *pdata = mci->pvt_info;
+	const dcr_host_t *dcr_host = &pdata->dcr_host;
+
+	mtsdram(dcr_host, SDRAM_ECCES,	status->ecces & SDRAM_ECCES_MASK);
+	mtsdram(dcr_host, SDRAM_WMIRQ,	status->wmirq & SDRAM_WMIRQ_MASK);
+	mtsdram(dcr_host, SDRAM_BESR,	status->besr & SDRAM_BESR_MASK);
+	mtsdram(dcr_host, SDRAM_BEARL,	0);
+	mtsdram(dcr_host, SDRAM_BEARH,	0);
+}
+
+/**
+ * ppc4xx_edac_handle_ce - handle controller correctable ECC error (CE)
+ * @mci: A pointer to the EDAC memory controller instance
+ *       associated with the correctable error being handled and reported.
+ * @status: A pointer to the ECC status structure associated with
+ *          the correctable error being handled and reported.
+ *
+ * This routine handles an ibm,sdram-4xx-ddr2 controller ECC
+ * correctable error. Per the aforementioned discussion, there's not
+ * enough status available to use the full EDAC correctable error
+ * interface, so we just pass driver-unique message to the "no info"
+ * interface.
+ */
+static void
+ppc4xx_edac_handle_ce(struct mem_ctl_info *mci,
+		      const struct ppc4xx_ecc_status *status)
+{
+	int row;
+	char message[PPC4XX_EDAC_MESSAGE_SIZE];
+
+	ppc4xx_edac_generate_message(mci, status, message, sizeof(message));
+
+	for (row = 0; row < mci->nr_csrows; row++)
+		if (ppc4xx_edac_check_bank_error(status, row))
+			edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci, 1,
+					     0, 0, 0,
+					     row, 0, -1,
+					     message, "");
+}
+
+/**
+ * ppc4xx_edac_handle_ue - handle controller uncorrectable ECC error (UE)
+ * @mci: A pointer to the EDAC memory controller instance
+ *       associated with the uncorrectable error being handled and
+ *       reported.
+ * @status: A pointer to the ECC status structure associated with
+ *          the uncorrectable error being handled and reported.
+ *
+ * This routine handles an ibm,sdram-4xx-ddr2 controller ECC
+ * uncorrectable error.
+ */
+static void
+ppc4xx_edac_handle_ue(struct mem_ctl_info *mci,
+		      const struct ppc4xx_ecc_status *status)
+{
+	const u64 bear = ((u64)status->bearh << 32 | status->bearl);
+	const unsigned long page = bear >> PAGE_SHIFT;
+	const unsigned long offset = bear & ~PAGE_MASK;
+	int row;
+	char message[PPC4XX_EDAC_MESSAGE_SIZE];
+
+	ppc4xx_edac_generate_message(mci, status, message, sizeof(message));
+
+	for (row = 0; row < mci->nr_csrows; row++)
+		if (ppc4xx_edac_check_bank_error(status, row))
+			edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1,
+					     page, offset, 0,
+					     row, 0, -1,
+					     message, "");
+}
+
+/**
+ * ppc4xx_edac_check - check controller for ECC errors
+ * @mci: A pointer to the EDAC memory controller instance
+ *       associated with the ibm,sdram-4xx-ddr2 controller being
+ *       checked.
+ *
+ * This routine is used to check and post ECC errors and is called by
+ * both the EDAC polling thread and this driver's CE and UE interrupt
+ * handler.
+ */
+static void
+ppc4xx_edac_check(struct mem_ctl_info *mci)
+{
+#ifdef DEBUG
+	static unsigned int count;
+#endif
+	struct ppc4xx_ecc_status status;
+
+	ppc4xx_ecc_get_status(mci, &status);
+
+#ifdef DEBUG
+	if (count++ % 30 == 0)
+		ppc4xx_ecc_dump_status(mci, &status);
+#endif
+
+	if (status.ecces & SDRAM_ECCES_UE)
+		ppc4xx_edac_handle_ue(mci, &status);
+
+	if (status.ecces & SDRAM_ECCES_CE)
+		ppc4xx_edac_handle_ce(mci, &status);
+
+	ppc4xx_ecc_clear_status(mci, &status);
+}
+
+/**
+ * ppc4xx_edac_isr - SEC (CE) and DED (UE) interrupt service routine
+ * @irq:    The virtual interrupt number being serviced.
+ * @dev_id: A pointer to the EDAC memory controller instance
+ *          associated with the interrupt being handled.
+ *
+ * This routine implements the interrupt handler for both correctable
+ * (CE) and uncorrectable (UE) ECC errors for the ibm,sdram-4xx-ddr2
+ * controller. It simply calls through to the same routine used during
+ * polling to check, report and clear the ECC status.
+ *
+ * Unconditionally returns IRQ_HANDLED.
+ */
+static irqreturn_t
+ppc4xx_edac_isr(int irq, void *dev_id)
+{
+	struct mem_ctl_info *mci = dev_id;
+
+	ppc4xx_edac_check(mci);
+
+	return IRQ_HANDLED;
+}
+
+/**
+ * ppc4xx_edac_get_dtype - return the controller memory width
+ * @mcopt1: The 32-bit Memory Controller Option 1 register value
+ *          currently set for the controller, from which the width
+ *          is derived.
+ *
+ * This routine returns the EDAC device type width appropriate for the
+ * current controller configuration.
+ *
+ * TODO: This needs to be conditioned dynamically through feature
+ * flags or some such when other controller variants are supported as
+ * the 405EX[r] is 16-/32-bit and the others are 32-/64-bit with the
+ * 16- and 64-bit field definition/value/enumeration (b1) overloaded
+ * among them.
+ *
+ * Returns a device type width enumeration.
+ */
+static enum dev_type ppc4xx_edac_get_dtype(u32 mcopt1)
+{
+	switch (mcopt1 & SDRAM_MCOPT1_WDTH_MASK) {
+	case SDRAM_MCOPT1_WDTH_16:
+		return DEV_X2;
+	case SDRAM_MCOPT1_WDTH_32:
+		return DEV_X4;
+	default:
+		return DEV_UNKNOWN;
+	}
+}
+
+/**
+ * ppc4xx_edac_get_mtype - return controller memory type
+ * @mcopt1: The 32-bit Memory Controller Option 1 register value
+ *          currently set for the controller, from which the memory type
+ *          is derived.
+ *
+ * This routine returns the EDAC memory type appropriate for the
+ * current controller configuration.
+ *
+ * Returns a memory type enumeration.
+ */
+static enum mem_type ppc4xx_edac_get_mtype(u32 mcopt1)
+{
+	bool rden = ((mcopt1 & SDRAM_MCOPT1_RDEN_MASK) == SDRAM_MCOPT1_RDEN);
+
+	switch (mcopt1 & SDRAM_MCOPT1_DDR_TYPE_MASK) {
+	case SDRAM_MCOPT1_DDR2_TYPE:
+		return rden ? MEM_RDDR2 : MEM_DDR2;
+	case SDRAM_MCOPT1_DDR1_TYPE:
+		return rden ? MEM_RDDR : MEM_DDR;
+	default:
+		return MEM_UNKNOWN;
+	}
+}
+
+/**
+ * ppc4xx_edac_init_csrows - initialize driver instance rows
+ * @mci: A pointer to the EDAC memory controller instance
+ *       associated with the ibm,sdram-4xx-ddr2 controller for which
+ *       the csrows (i.e. banks/ranks) are being initialized.
+ * @mcopt1: The 32-bit Memory Controller Option 1 register value
+ *          currently set for the controller, from which bank width
+ *          and memory typ information is derived.
+ *
+ * This routine initializes the virtual "chip select rows" associated
+ * with the EDAC memory controller instance. An ibm,sdram-4xx-ddr2
+ * controller bank/rank is mapped to a row.
+ *
+ * Returns 0 if OK; otherwise, -EINVAL if the memory bank size
+ * configuration cannot be determined.
+ */
+static int ppc4xx_edac_init_csrows(struct mem_ctl_info *mci, u32 mcopt1)
+{
+	const struct ppc4xx_edac_pdata *pdata = mci->pvt_info;
+	int status = 0;
+	enum mem_type mtype;
+	enum dev_type dtype;
+	enum edac_type edac_mode;
+	int row, j;
+	u32 mbxcf, size, nr_pages;
+
+	/* Establish the memory type and width */
+
+	mtype = ppc4xx_edac_get_mtype(mcopt1);
+	dtype = ppc4xx_edac_get_dtype(mcopt1);
+
+	/* Establish EDAC mode */
+
+	if (mci->edac_cap & EDAC_FLAG_SECDED)
+		edac_mode = EDAC_SECDED;
+	else if (mci->edac_cap & EDAC_FLAG_EC)
+		edac_mode = EDAC_EC;
+	else
+		edac_mode = EDAC_NONE;
+
+	/*
+	 * Initialize each chip select row structure which correspond
+	 * 1:1 with a controller bank/rank.
+	 */
+
+	for (row = 0; row < mci->nr_csrows; row++) {
+		struct csrow_info *csi = mci->csrows[row];
+
+		/*
+		 * Get the configuration settings for this
+		 * row/bank/rank and skip disabled banks.
+		 */
+
+		mbxcf = mfsdram(&pdata->dcr_host, SDRAM_MBXCF(row));
+
+		if ((mbxcf & SDRAM_MBCF_BE_MASK) != SDRAM_MBCF_BE_ENABLE)
+			continue;
+
+		/* Map the bank configuration size setting to pages. */
+
+		size = mbxcf & SDRAM_MBCF_SZ_MASK;
+
+		switch (size) {
+		case SDRAM_MBCF_SZ_4MB:
+		case SDRAM_MBCF_SZ_8MB:
+		case SDRAM_MBCF_SZ_16MB:
+		case SDRAM_MBCF_SZ_32MB:
+		case SDRAM_MBCF_SZ_64MB:
+		case SDRAM_MBCF_SZ_128MB:
+		case SDRAM_MBCF_SZ_256MB:
+		case SDRAM_MBCF_SZ_512MB:
+		case SDRAM_MBCF_SZ_1GB:
+		case SDRAM_MBCF_SZ_2GB:
+		case SDRAM_MBCF_SZ_4GB:
+		case SDRAM_MBCF_SZ_8GB:
+			nr_pages = SDRAM_MBCF_SZ_TO_PAGES(size);
+			break;
+		default:
+			ppc4xx_edac_mc_printk(KERN_ERR, mci,
+					      "Unrecognized memory bank %d "
+					      "size 0x%08x\n",
+					      row, SDRAM_MBCF_SZ_DECODE(size));
+			status = -EINVAL;
+			goto done;
+		}
+
+		/*
+		 * It's unclear exactly what grain should be set to
+		 * here. The SDRAM_ECCES register allows resolution of
+		 * an error down to a nibble which would potentially
+		 * argue for a grain of '1' byte, even though we only
+		 * know the associated address for uncorrectable
+		 * errors. This value is not used at present for
+		 * anything other than error reporting so getting it
+		 * wrong should be of little consequence. Other
+		 * possible values would be the PLB width (16), the
+		 * page size (PAGE_SIZE) or the memory width (2 or 4).
+		 */
+		for (j = 0; j < csi->nr_channels; j++) {
+			struct dimm_info *dimm = csi->channels[j]->dimm;
+
+			dimm->nr_pages  = nr_pages / csi->nr_channels;
+			dimm->grain	= 1;
+
+			dimm->mtype	= mtype;
+			dimm->dtype	= dtype;
+
+			dimm->edac_mode	= edac_mode;
+		}
+	}
+
+ done:
+	return status;
+}
+
+/**
+ * ppc4xx_edac_mc_init - initialize driver instance
+ * @mci: A pointer to the EDAC memory controller instance being
+ *       initialized.
+ * @op: A pointer to the OpenFirmware device tree node associated
+ *      with the controller this EDAC instance is bound to.
+ * @dcr_host: A pointer to the DCR data containing the DCR mapping
+ *            for this controller instance.
+ * @mcopt1: The 32-bit Memory Controller Option 1 register value
+ *          currently set for the controller, from which ECC capabilities
+ *          and scrub mode are derived.
+ *
+ * This routine performs initialization of the EDAC memory controller
+ * instance and related driver-private data associated with the
+ * ibm,sdram-4xx-ddr2 memory controller the instance is bound to.
+ *
+ * Returns 0 if OK; otherwise, < 0 on error.
+ */
+static int ppc4xx_edac_mc_init(struct mem_ctl_info *mci,
+			       struct platform_device *op,
+			       const dcr_host_t *dcr_host, u32 mcopt1)
+{
+	int status = 0;
+	const u32 memcheck = (mcopt1 & SDRAM_MCOPT1_MCHK_MASK);
+	struct ppc4xx_edac_pdata *pdata = NULL;
+	const struct device_node *np = op->dev.of_node;
+
+	if (of_match_device(ppc4xx_edac_match, &op->dev) == NULL)
+		return -EINVAL;
+
+	/* Initial driver pointers and private data */
+
+	mci->pdev		= &op->dev;
+
+	dev_set_drvdata(mci->pdev, mci);
+
+	pdata			= mci->pvt_info;
+
+	pdata->dcr_host		= *dcr_host;
+
+	/* Initialize controller capabilities and configuration */
+
+	mci->mtype_cap		= (MEM_FLAG_DDR | MEM_FLAG_RDDR |
+				   MEM_FLAG_DDR2 | MEM_FLAG_RDDR2);
+
+	mci->edac_ctl_cap	= (EDAC_FLAG_NONE |
+				   EDAC_FLAG_EC |
+				   EDAC_FLAG_SECDED);
+
+	mci->scrub_cap		= SCRUB_NONE;
+	mci->scrub_mode		= SCRUB_NONE;
+
+	/*
+	 * Update the actual capabilites based on the MCOPT1[MCHK]
+	 * settings. Scrubbing is only useful if reporting is enabled.
+	 */
+
+	switch (memcheck) {
+	case SDRAM_MCOPT1_MCHK_CHK:
+		mci->edac_cap	= EDAC_FLAG_EC;
+		break;
+	case SDRAM_MCOPT1_MCHK_CHK_REP:
+		mci->edac_cap	= (EDAC_FLAG_EC | EDAC_FLAG_SECDED);
+		mci->scrub_mode	= SCRUB_SW_SRC;
+		break;
+	default:
+		mci->edac_cap	= EDAC_FLAG_NONE;
+		break;
+	}
+
+	/* Initialize strings */
+
+	mci->mod_name		= PPC4XX_EDAC_MODULE_NAME;
+	mci->ctl_name		= ppc4xx_edac_match->compatible,
+	mci->dev_name		= np->full_name;
+
+	/* Initialize callbacks */
+
+	mci->edac_check		= ppc4xx_edac_check;
+	mci->ctl_page_to_phys	= NULL;
+
+	/* Initialize chip select rows */
+
+	status = ppc4xx_edac_init_csrows(mci, mcopt1);
+
+	if (status)
+		ppc4xx_edac_mc_printk(KERN_ERR, mci,
+				      "Failed to initialize rows!\n");
+
+	return status;
+}
+
+/**
+ * ppc4xx_edac_register_irq - setup and register controller interrupts
+ * @op: A pointer to the OpenFirmware device tree node associated
+ *      with the controller this EDAC instance is bound to.
+ * @mci: A pointer to the EDAC memory controller instance
+ *       associated with the ibm,sdram-4xx-ddr2 controller for which
+ *       interrupts are being registered.
+ *
+ * This routine parses the correctable (CE) and uncorrectable error (UE)
+ * interrupts from the device tree node and maps and assigns them to
+ * the associated EDAC memory controller instance.
+ *
+ * Returns 0 if OK; otherwise, -ENODEV if the interrupts could not be
+ * mapped and assigned.
+ */
+static int ppc4xx_edac_register_irq(struct platform_device *op,
+				    struct mem_ctl_info *mci)
+{
+	int status = 0;
+	int ded_irq, sec_irq;
+	struct ppc4xx_edac_pdata *pdata = mci->pvt_info;
+	struct device_node *np = op->dev.of_node;
+
+	ded_irq = irq_of_parse_and_map(np, INTMAP_ECCDED_INDEX);
+	sec_irq = irq_of_parse_and_map(np, INTMAP_ECCSEC_INDEX);
+
+	if (!ded_irq || !sec_irq) {
+		ppc4xx_edac_mc_printk(KERN_ERR, mci,
+				      "Unable to map interrupts.\n");
+		status = -ENODEV;
+		goto fail;
+	}
+
+	status = request_irq(ded_irq,
+			     ppc4xx_edac_isr,
+			     0,
+			     "[EDAC] MC ECCDED",
+			     mci);
+
+	if (status < 0) {
+		ppc4xx_edac_mc_printk(KERN_ERR, mci,
+				      "Unable to request irq %d for ECC DED",
+				      ded_irq);
+		status = -ENODEV;
+		goto fail1;
+	}
+
+	status = request_irq(sec_irq,
+			     ppc4xx_edac_isr,
+			     0,
+			     "[EDAC] MC ECCSEC",
+			     mci);
+
+	if (status < 0) {
+		ppc4xx_edac_mc_printk(KERN_ERR, mci,
+				      "Unable to request irq %d for ECC SEC",
+				      sec_irq);
+		status = -ENODEV;
+		goto fail2;
+	}
+
+	ppc4xx_edac_mc_printk(KERN_INFO, mci, "ECCDED irq is %d\n", ded_irq);
+	ppc4xx_edac_mc_printk(KERN_INFO, mci, "ECCSEC irq is %d\n", sec_irq);
+
+	pdata->irqs.ded = ded_irq;
+	pdata->irqs.sec = sec_irq;
+
+	return 0;
+
+ fail2:
+	free_irq(sec_irq, mci);
+
+ fail1:
+	free_irq(ded_irq, mci);
+
+ fail:
+	return status;
+}
+
+/**
+ * ppc4xx_edac_map_dcrs - locate and map controller registers
+ * @np: A pointer to the device tree node containing the DCR
+ *      resources to map.
+ * @dcr_host: A pointer to the DCR data to populate with the
+ *            DCR mapping.
+ *
+ * This routine attempts to locate in the device tree and map the DCR
+ * register resources associated with the controller's indirect DCR
+ * address and data windows.
+ *
+ * Returns 0 if the DCRs were successfully mapped; otherwise, < 0 on
+ * error.
+ */
+static int ppc4xx_edac_map_dcrs(const struct device_node *np,
+				dcr_host_t *dcr_host)
+{
+	unsigned int dcr_base, dcr_len;
+
+	if (np == NULL || dcr_host == NULL)
+		return -EINVAL;
+
+	/* Get the DCR resource extent and sanity check the values. */
+
+	dcr_base = dcr_resource_start(np, 0);
+	dcr_len = dcr_resource_len(np, 0);
+
+	if (dcr_base == 0 || dcr_len == 0) {
+		ppc4xx_edac_printk(KERN_ERR,
+				   "Failed to obtain DCR property.\n");
+		return -ENODEV;
+	}
+
+	if (dcr_len != SDRAM_DCR_RESOURCE_LEN) {
+		ppc4xx_edac_printk(KERN_ERR,
+				   "Unexpected DCR length %d, expected %d.\n",
+				   dcr_len, SDRAM_DCR_RESOURCE_LEN);
+		return -ENODEV;
+	}
+
+	/*  Attempt to map the DCR extent. */
+
+	*dcr_host = dcr_map(np, dcr_base, dcr_len);
+
+	if (!DCR_MAP_OK(*dcr_host)) {
+		ppc4xx_edac_printk(KERN_INFO, "Failed to map DCRs.\n");
+		    return -ENODEV;
+	}
+
+	return 0;
+}
+
+/**
+ * ppc4xx_edac_probe - check controller and bind driver
+ * @op: A pointer to the OpenFirmware device tree node associated
+ *      with the controller being probed for driver binding.
+ *
+ * This routine probes a specific ibm,sdram-4xx-ddr2 controller
+ * instance for binding with the driver.
+ *
+ * Returns 0 if the controller instance was successfully bound to the
+ * driver; otherwise, < 0 on error.
+ */
+static int ppc4xx_edac_probe(struct platform_device *op)
+{
+	int status = 0;
+	u32 mcopt1, memcheck;
+	dcr_host_t dcr_host;
+	const struct device_node *np = op->dev.of_node;
+	struct mem_ctl_info *mci = NULL;
+	struct edac_mc_layer layers[2];
+	static int ppc4xx_edac_instance;
+
+	/*
+	 * At this point, we only support the controller realized on
+	 * the AMCC PPC 405EX[r]. Reject anything else.
+	 */
+
+	if (!of_device_is_compatible(np, "ibm,sdram-405ex") &&
+	    !of_device_is_compatible(np, "ibm,sdram-405exr")) {
+		ppc4xx_edac_printk(KERN_NOTICE,
+				   "Only the PPC405EX[r] is supported.\n");
+		return -ENODEV;
+	}
+
+	/*
+	 * Next, get the DCR property and attempt to map it so that we
+	 * can probe the controller.
+	 */
+
+	status = ppc4xx_edac_map_dcrs(np, &dcr_host);
+
+	if (status)
+		return status;
+
+	/*
+	 * First determine whether ECC is enabled at all. If not,
+	 * there is no useful checking or monitoring that can be done
+	 * for this controller.
+	 */
+
+	mcopt1 = mfsdram(&dcr_host, SDRAM_MCOPT1);
+	memcheck = (mcopt1 & SDRAM_MCOPT1_MCHK_MASK);
+
+	if (memcheck == SDRAM_MCOPT1_MCHK_NON) {
+		ppc4xx_edac_printk(KERN_INFO, "%pOF: No ECC memory detected or "
+				   "ECC is disabled.\n", np);
+		status = -ENODEV;
+		goto done;
+	}
+
+	/*
+	 * At this point, we know ECC is enabled, allocate an EDAC
+	 * controller instance and perform the appropriate
+	 * initialization.
+	 */
+	layers[0].type = EDAC_MC_LAYER_CHIP_SELECT;
+	layers[0].size = ppc4xx_edac_nr_csrows;
+	layers[0].is_virt_csrow = true;
+	layers[1].type = EDAC_MC_LAYER_CHANNEL;
+	layers[1].size = ppc4xx_edac_nr_chans;
+	layers[1].is_virt_csrow = false;
+	mci = edac_mc_alloc(ppc4xx_edac_instance, ARRAY_SIZE(layers), layers,
+			    sizeof(struct ppc4xx_edac_pdata));
+	if (mci == NULL) {
+		ppc4xx_edac_printk(KERN_ERR, "%pOF: "
+				   "Failed to allocate EDAC MC instance!\n",
+				   np);
+		status = -ENOMEM;
+		goto done;
+	}
+
+	status = ppc4xx_edac_mc_init(mci, op, &dcr_host, mcopt1);
+
+	if (status) {
+		ppc4xx_edac_mc_printk(KERN_ERR, mci,
+				      "Failed to initialize instance!\n");
+		goto fail;
+	}
+
+	/*
+	 * We have a valid, initialized EDAC instance bound to the
+	 * controller. Attempt to register it with the EDAC subsystem
+	 * and, if necessary, register interrupts.
+	 */
+
+	if (edac_mc_add_mc(mci)) {
+		ppc4xx_edac_mc_printk(KERN_ERR, mci,
+				      "Failed to add instance!\n");
+		status = -ENODEV;
+		goto fail;
+	}
+
+	if (edac_op_state == EDAC_OPSTATE_INT) {
+		status = ppc4xx_edac_register_irq(op, mci);
+
+		if (status)
+			goto fail1;
+	}
+
+	ppc4xx_edac_instance++;
+
+	return 0;
+
+ fail1:
+	edac_mc_del_mc(mci->pdev);
+
+ fail:
+	edac_mc_free(mci);
+
+ done:
+	return status;
+}
+
+/**
+ * ppc4xx_edac_remove - unbind driver from controller
+ * @op: A pointer to the OpenFirmware device tree node associated
+ *      with the controller this EDAC instance is to be unbound/removed
+ *      from.
+ *
+ * This routine unbinds the EDAC memory controller instance associated
+ * with the specified ibm,sdram-4xx-ddr2 controller described by the
+ * OpenFirmware device tree node passed as a parameter.
+ *
+ * Unconditionally returns 0.
+ */
+static int
+ppc4xx_edac_remove(struct platform_device *op)
+{
+	struct mem_ctl_info *mci = dev_get_drvdata(&op->dev);
+	struct ppc4xx_edac_pdata *pdata = mci->pvt_info;
+
+	if (edac_op_state == EDAC_OPSTATE_INT) {
+		free_irq(pdata->irqs.sec, mci);
+		free_irq(pdata->irqs.ded, mci);
+	}
+
+	dcr_unmap(pdata->dcr_host, SDRAM_DCR_RESOURCE_LEN);
+
+	edac_mc_del_mc(mci->pdev);
+	edac_mc_free(mci);
+
+	return 0;
+}
+
+/**
+ * ppc4xx_edac_opstate_init - initialize EDAC reporting method
+ *
+ * This routine ensures that the EDAC memory controller reporting
+ * method is mapped to a sane value as the EDAC core defines the value
+ * to EDAC_OPSTATE_INVAL by default. We don't call the global
+ * opstate_init as that defaults to polling and we want interrupt as
+ * the default.
+ */
+static inline void __init
+ppc4xx_edac_opstate_init(void)
+{
+	switch (edac_op_state) {
+	case EDAC_OPSTATE_POLL:
+	case EDAC_OPSTATE_INT:
+		break;
+	default:
+		edac_op_state = EDAC_OPSTATE_INT;
+		break;
+	}
+
+	ppc4xx_edac_printk(KERN_INFO, "Reporting type: %s\n",
+			   ((edac_op_state == EDAC_OPSTATE_POLL) ?
+			    EDAC_OPSTATE_POLL_STR :
+			    ((edac_op_state == EDAC_OPSTATE_INT) ?
+			     EDAC_OPSTATE_INT_STR :
+			     EDAC_OPSTATE_UNKNOWN_STR)));
+}
+
+/**
+ * ppc4xx_edac_init - driver/module insertion entry point
+ *
+ * This routine is the driver/module insertion entry point. It
+ * initializes the EDAC memory controller reporting state and
+ * registers the driver as an OpenFirmware device tree platform
+ * driver.
+ */
+static int __init
+ppc4xx_edac_init(void)
+{
+	ppc4xx_edac_printk(KERN_INFO, PPC4XX_EDAC_MODULE_REVISION "\n");
+
+	ppc4xx_edac_opstate_init();
+
+	return platform_driver_register(&ppc4xx_edac_driver);
+}
+
+/**
+ * ppc4xx_edac_exit - driver/module removal entry point
+ *
+ * This routine is the driver/module removal entry point. It
+ * unregisters the driver as an OpenFirmware device tree platform
+ * driver.
+ */
+static void __exit
+ppc4xx_edac_exit(void)
+{
+	platform_driver_unregister(&ppc4xx_edac_driver);
+}
+
+module_init(ppc4xx_edac_init);
+module_exit(ppc4xx_edac_exit);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Grant Erickson <gerickson@nuovations.com>");
+MODULE_DESCRIPTION("EDAC MC Driver for the PPC4xx IBM DDR2 Memory Controller");
+module_param(edac_op_state, int, 0444);
+MODULE_PARM_DESC(edac_op_state, "EDAC Error Reporting State: "
+		 "0=" EDAC_OPSTATE_POLL_STR ", 2=" EDAC_OPSTATE_INT_STR);