Release 4.11 drivers/edac/i5400_edac.c

/*
 * Intel 5400 class Memory Controllers kernel module (Seaburg)
 *
 * This file may be distributed under the terms of the
 * GNU General Public License.
 *
 * Copyright (c) 2008 by:
 *       Ben Woodard <woodard@redhat.com>
 *       Mauro Carvalho Chehab
 *
 * Red Hat Inc. http://www.redhat.com
 *
 * Forked and adapted from the i5000_edac driver which was
 * written by Douglas Thompson Linux Networx <norsk5@xmission.com>
 *
 * This module is based on the following document:
 *
 * Intel 5400 Chipset Memory Controller Hub (MCH) - Datasheet
 *      http://developer.intel.com/design/chipsets/datashts/313070.htm
 *
 * This Memory Controller manages DDR2 FB-DIMMs. It has 2 branches, each with
 * 2 channels operating in lockstep no-mirror mode. Each channel can have up to
 * 4 dimm's, each with up to 8GB.
 *
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/pci_ids.h>
#include <linux/slab.h>
#include <linux/edac.h>
#include <linux/mmzone.h>

#include "edac_module.h"

/*
 * Alter this version for the I5400 module when modifications are made
 */

#define I5400_REVISION    " Ver: 1.0.0"


#define EDAC_MOD_STR      "i5400_edac"


#define i5400_printk(level, fmt, arg...) \
	edac_printk(level, "i5400", fmt, ##arg)


#define i5400_mc_printk(mci, level, fmt, arg...) \
	edac_mc_chipset_printk(mci, level, "i5400", fmt, ##arg)

/* Limits for i5400 */

#define MAX_BRANCHES		2

#define CHANNELS_PER_BRANCH	2

#define DIMMS_PER_CHANNEL	4

#define	MAX_CHANNELS		(MAX_BRANCHES * CHANNELS_PER_BRANCH)

/* Device 16,
 * Function 0: System Address
 * Function 1: Memory Branch Map, Control, Errors Register
 * Function 2: FSB Error Registers
 *
 * All 3 functions of Device 16 (0,1,2) share the SAME DID and
 * uses PCI_DEVICE_ID_INTEL_5400_ERR for device 16 (0,1,2),
 * PCI_DEVICE_ID_INTEL_5400_FBD0 and PCI_DEVICE_ID_INTEL_5400_FBD1
 * for device 21 (0,1).
 */

	/* OFFSETS for Function 0 */

#define		AMBASE			0x48 
/* AMB Mem Mapped Reg Region Base */

#define		MAXCH			0x56 
/* Max Channel Number */

#define		MAXDIMMPERCH		0x57 
/* Max DIMM PER Channel Number */

	/* OFFSETS for Function 1 */

#define		TOLM			0x6C

#define		REDMEMB			0x7C

#define			REC_ECC_LOCATOR_ODD(x)	((x) & 0x3fe00) 
/* bits [17:9] indicate ODD, [8:0]  indicate EVEN */

#define		MIR0			0x80

#define		MIR1			0x84

#define		AMIR0			0x8c

#define		AMIR1			0x90

	/* Fatal error registers */

#define		FERR_FAT_FBD		0x98	
/* also called as FERR_FAT_FB_DIMM at datasheet */

#define			FERR_FAT_FBDCHAN (3<<28)	
/* channel index where the highest-order error occurred */


#define		NERR_FAT_FBD		0x9c

#define		FERR_NF_FBD		0xa0	
/* also called as FERR_NFAT_FB_DIMM at datasheet */

	/* Non-fatal error register */

#define		NERR_NF_FBD		0xa4

	/* Enable error mask */

#define		EMASK_FBD		0xa8


#define		ERR0_FBD		0xac

#define		ERR1_FBD		0xb0

#define		ERR2_FBD		0xb4

#define		MCERR_FBD		0xb8

	/* No OFFSETS for Device 16 Function 2 */

/*
 * Device 21,
 * Function 0: Memory Map Branch 0
 *
 * Device 22,
 * Function 0: Memory Map Branch 1
 */

	/* OFFSETS for Function 0 */

#define AMBPRESENT_0	0x64

#define AMBPRESENT_1	0x66

#define MTR0		0x80

#define MTR1		0x82

#define MTR2		0x84

#define MTR3		0x86

	/* OFFSETS for Function 1 */

#define NRECFGLOG		0x74

#define RECFGLOG		0x78

#define NRECMEMA		0xbe

#define NRECMEMB		0xc0

#define NRECFB_DIMMA		0xc4

#define NRECFB_DIMMB		0xc8

#define NRECFB_DIMMC		0xcc

#define NRECFB_DIMMD		0xd0

#define NRECFB_DIMME		0xd4

#define NRECFB_DIMMF		0xd8

#define REDMEMA			0xdC

#define RECMEMA			0xf0

#define RECMEMB			0xf4

#define RECFB_DIMMA		0xf8

#define RECFB_DIMMB		0xec

#define RECFB_DIMMC		0xf0

#define RECFB_DIMMD		0xf4

#define RECFB_DIMME		0xf8

#define RECFB_DIMMF		0xfC

/*
 * Error indicator bits and masks
 * Error masks are according with Table 5-17 of i5400 datasheet
 */


enum error_mask {
	
EMASK_M1  = 1<<0,  /* Memory Write error on non-redundant retry */
	
EMASK_M2  = 1<<1,  /* Memory or FB-DIMM configuration CRC read error */
	
EMASK_M3  = 1<<2,  /* Reserved */
	
EMASK_M4  = 1<<3,  /* Uncorrectable Data ECC on Replay */
	
EMASK_M5  = 1<<4,  /* Aliased Uncorrectable Non-Mirrored Demand Data ECC */
	
EMASK_M6  = 1<<5,  /* Unsupported on i5400 */
	
EMASK_M7  = 1<<6,  /* Aliased Uncorrectable Resilver- or Spare-Copy Data ECC */
	
EMASK_M8  = 1<<7,  /* Aliased Uncorrectable Patrol Data ECC */
	
EMASK_M9  = 1<<8,  /* Non-Aliased Uncorrectable Non-Mirrored Demand Data ECC */
	
EMASK_M10 = 1<<9,  /* Unsupported on i5400 */
	
EMASK_M11 = 1<<10, /* Non-Aliased Uncorrectable Resilver- or Spare-Copy Data ECC  */
	
EMASK_M12 = 1<<11, /* Non-Aliased Uncorrectable Patrol Data ECC */
	
EMASK_M13 = 1<<12, /* Memory Write error on first attempt */
	
EMASK_M14 = 1<<13, /* FB-DIMM Configuration Write error on first attempt */
	
EMASK_M15 = 1<<14, /* Memory or FB-DIMM configuration CRC read error */
	
EMASK_M16 = 1<<15, /* Channel Failed-Over Occurred */
	
EMASK_M17 = 1<<16, /* Correctable Non-Mirrored Demand Data ECC */
	
EMASK_M18 = 1<<17, /* Unsupported on i5400 */
	
EMASK_M19 = 1<<18, /* Correctable Resilver- or Spare-Copy Data ECC */
	
EMASK_M20 = 1<<19, /* Correctable Patrol Data ECC */
	
EMASK_M21 = 1<<20, /* FB-DIMM Northbound parity error on FB-DIMM Sync Status */
	
EMASK_M22 = 1<<21, /* SPD protocol Error */
	
EMASK_M23 = 1<<22, /* Non-Redundant Fast Reset Timeout */
	
EMASK_M24 = 1<<23, /* Refresh error */
	
EMASK_M25 = 1<<24, /* Memory Write error on redundant retry */
	
EMASK_M26 = 1<<25, /* Redundant Fast Reset Timeout */
	
EMASK_M27 = 1<<26, /* Correctable Counter Threshold Exceeded */
	
EMASK_M28 = 1<<27, /* DIMM-Spare Copy Completed */
	
EMASK_M29 = 1<<28, /* DIMM-Isolation Completed */
};

/*
 * Names to translate bit error into something useful
 */

static const char *error_name[] = {
	[0]  = "Memory Write error on non-redundant retry",
	[1]  = "Memory or FB-DIMM configuration CRC read error",
	/* Reserved */
	[3]  = "Uncorrectable Data ECC on Replay",
	[4]  = "Aliased Uncorrectable Non-Mirrored Demand Data ECC",
	/* M6 Unsupported on i5400 */
	[6]  = "Aliased Uncorrectable Resilver- or Spare-Copy Data ECC",
	[7]  = "Aliased Uncorrectable Patrol Data ECC",
	[8]  = "Non-Aliased Uncorrectable Non-Mirrored Demand Data ECC",
	/* M10 Unsupported on i5400 */
	[10] = "Non-Aliased Uncorrectable Resilver- or Spare-Copy Data ECC",
	[11] = "Non-Aliased Uncorrectable Patrol Data ECC",
	[12] = "Memory Write error on first attempt",
	[13] = "FB-DIMM Configuration Write error on first attempt",
	[14] = "Memory or FB-DIMM configuration CRC read error",
	[15] = "Channel Failed-Over Occurred",
	[16] = "Correctable Non-Mirrored Demand Data ECC",
	/* M18 Unsupported on i5400 */
	[18] = "Correctable Resilver- or Spare-Copy Data ECC",
	[19] = "Correctable Patrol Data ECC",
	[20] = "FB-DIMM Northbound parity error on FB-DIMM Sync Status",
	[21] = "SPD protocol Error",
	[22] = "Non-Redundant Fast Reset Timeout",
	[23] = "Refresh error",
	[24] = "Memory Write error on redundant retry",
	[25] = "Redundant Fast Reset Timeout",
	[26] = "Correctable Counter Threshold Exceeded",
	[27] = "DIMM-Spare Copy Completed",
	[28] = "DIMM-Isolation Completed",
};

/* Fatal errors */

#define ERROR_FAT_MASK		(EMASK_M1 | \
                                 EMASK_M2 | \
                                 EMASK_M23)

/* Correctable errors */

#define ERROR_NF_CORRECTABLE	(EMASK_M27 | \
                                 EMASK_M20 | \
                                 EMASK_M19 | \
                                 EMASK_M18 | \
                                 EMASK_M17 | \
                                 EMASK_M16)

#define ERROR_NF_DIMM_SPARE	(EMASK_M29 | \
                                 EMASK_M28)

#define ERROR_NF_SPD_PROTOCOL	(EMASK_M22)

#define ERROR_NF_NORTH_CRC	(EMASK_M21)

/* Recoverable errors */

#define ERROR_NF_RECOVERABLE	(EMASK_M26 | \
                                 EMASK_M25 | \
                                 EMASK_M24 | \
                                 EMASK_M15 | \
                                 EMASK_M14 | \
                                 EMASK_M13 | \
                                 EMASK_M12 | \
                                 EMASK_M11 | \
                                 EMASK_M9  | \
                                 EMASK_M8  | \
                                 EMASK_M7  | \
                                 EMASK_M5)

/* uncorrectable errors */

#define ERROR_NF_UNCORRECTABLE	(EMASK_M4)

/* mask to all non-fatal errors */

#define ERROR_NF_MASK		(ERROR_NF_CORRECTABLE   | \
                                 ERROR_NF_UNCORRECTABLE | \
                                 ERROR_NF_RECOVERABLE   | \
                                 ERROR_NF_DIMM_SPARE    | \
                                 ERROR_NF_SPD_PROTOCOL  | \
                                 ERROR_NF_NORTH_CRC)

/*
 * Define error masks for the several registers
 */

/* Enable all fatal and non fatal errors */

#define ENABLE_EMASK_ALL	(ERROR_FAT_MASK | ERROR_NF_MASK)

/* mask for fatal error registers */

#define FERR_FAT_MASK ERROR_FAT_MASK

/* masks for non-fatal error register */


static inline int to_nf_mask(unsigned int mask)
{
	return (mask & EMASK_M29) | (mask >> 3);
}
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;



static inline int from_nf_ferr(unsigned int mask)
{
	return (mask & EMASK_M29) |		/* Bit 28 */
	       (mask & ((1 << 28) - 1) << 3);	/* Bits 0 to 27 */
}
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;


#define FERR_NF_MASK		to_nf_mask(ERROR_NF_MASK)

#define FERR_NF_CORRECTABLE	to_nf_mask(ERROR_NF_CORRECTABLE)

#define FERR_NF_DIMM_SPARE	to_nf_mask(ERROR_NF_DIMM_SPARE)

#define FERR_NF_SPD_PROTOCOL	to_nf_mask(ERROR_NF_SPD_PROTOCOL)

#define FERR_NF_NORTH_CRC	to_nf_mask(ERROR_NF_NORTH_CRC)

#define FERR_NF_RECOVERABLE	to_nf_mask(ERROR_NF_RECOVERABLE)

#define FERR_NF_UNCORRECTABLE	to_nf_mask(ERROR_NF_UNCORRECTABLE)

/* Defines to extract the vaious fields from the
 *      MTRx - Memory Technology Registers
 */

#define MTR_DIMMS_PRESENT(mtr)		((mtr) & (1 << 10))

#define MTR_DIMMS_ETHROTTLE(mtr)	((mtr) & (1 << 9))

#define MTR_DRAM_WIDTH(mtr)		(((mtr) & (1 << 8)) ? 8 : 4)

#define MTR_DRAM_BANKS(mtr)		(((mtr) & (1 << 6)) ? 8 : 4)

#define MTR_DRAM_BANKS_ADDR_BITS(mtr)	((MTR_DRAM_BANKS(mtr) == 8) ? 3 : 2)

#define MTR_DIMM_RANK(mtr)		(((mtr) >> 5) & 0x1)

#define MTR_DIMM_RANK_ADDR_BITS(mtr)	(MTR_DIMM_RANK(mtr) ? 2 : 1)

#define MTR_DIMM_ROWS(mtr)		(((mtr) >> 2) & 0x3)

#define MTR_DIMM_ROWS_ADDR_BITS(mtr)	(MTR_DIMM_ROWS(mtr) + 13)

#define MTR_DIMM_COLS(mtr)		((mtr) & 0x3)

#define MTR_DIMM_COLS_ADDR_BITS(mtr)	(MTR_DIMM_COLS(mtr) + 10)

/* This applies to FERR_NF_FB-DIMM as well as FERR_FAT_FB-DIMM */


static inline int extract_fbdchan_indx(u32 x)
{
	return (x>>28) & 0x3;
}

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/* Device name and register DID (Device ID) */

struct i5400_dev_info {
	
const char *ctl_name;	/* name for this device */
	
u16 fsb_mapping_errors;	/* DID for the branchmap,control */
};

/* Table of devices attributes supported by this driver */

static const struct i5400_dev_info i5400_devs[] = {
	{
		.ctl_name = "I5400",
		.fsb_mapping_errors = PCI_DEVICE_ID_INTEL_5400_ERR,
        },
};


struct i5400_dimm_info {
	
int megabytes;		/* size, 0 means not present  */
};

/* driver private data structure */

struct i5400_pvt {
	
struct pci_dev *system_address;		/* 16.0 */
	
struct pci_dev *branchmap_werrors;	/* 16.1 */
	
struct pci_dev *fsb_error_regs;		/* 16.2 */
	
struct pci_dev *branch_0;		/* 21.0 */
	
struct pci_dev *branch_1;		/* 22.0 */

	
u16 tolm;				/* top of low memory */
	union {
		
u64 ambase;				/* AMB BAR */
		struct {
			
u32 ambase_bottom;
			
u32 ambase_top;
		} 
u __packed;
	};

	

u16 mir0, mir1;

	
u16 b0_mtr[DIMMS_PER_CHANNEL];	/* Memory Technlogy Reg */
	
u16 b0_ambpresent0;			/* Branch 0, Channel 0 */
	
u16 b0_ambpresent1;			/* Brnach 0, Channel 1 */

	
u16 b1_mtr[DIMMS_PER_CHANNEL];	/* Memory Technlogy Reg */
	
u16 b1_ambpresent0;			/* Branch 1, Channel 8 */
	
u16 b1_ambpresent1;			/* Branch 1, Channel 1 */

	/* DIMM information matrix, allocating architecture maximums */
	
struct i5400_dimm_info dimm_info[DIMMS_PER_CHANNEL][MAX_CHANNELS];

	/* Actual values for this controller */
	
int maxch;				/* Max channels */
	
int maxdimmperch;			/* Max DIMMs per channel */
};

/* I5400 MCH error information retrieved from Hardware */

struct i5400_error_info {
	/* These registers are always read from the MC */
	
u32 ferr_fat_fbd;	/* First Errors Fatal */
	
u32 nerr_fat_fbd;	/* Next Errors Fatal */
	
u32 ferr_nf_fbd;	/* First Errors Non-Fatal */
	
u32 nerr_nf_fbd;	/* Next Errors Non-Fatal */

	/* These registers are input ONLY if there was a Recoverable Error */
	
u32 redmemb;		/* Recoverable Mem Data Error log B */
	
u16 recmema;		/* Recoverable Mem Error log A */
	
u32 recmemb;		/* Recoverable Mem Error log B */

	/* These registers are input ONLY if there was a Non-Rec Error */
	
u16 nrecmema;		/* Non-Recoverable Mem log A */
	
u16 nrecmemb;		/* Non-Recoverable Mem log B */

};

/* note that nrec_rdwr changed from NRECMEMA to NRECMEMB between the 5000 and
   5400 better to use an inline function than a macro in this case */


static inline int nrec_bank(struct i5400_error_info *info)
{
	return ((info->nrecmema) >> 12) & 0x7;
}
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static inline int nrec_rank(struct i5400_error_info *info)
{
	return ((info->nrecmema) >> 8) & 0xf;
}
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static inline int nrec_buf_id(struct i5400_error_info *info)
{
	return ((info->nrecmema)) & 0xff;
}
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static inline int nrec_rdwr(struct i5400_error_info *info)
{
	return (info->nrecmemb) >> 31;
}
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/* This applies to both NREC and REC string so it can be used with nrec_rdwr
   and rec_rdwr */


static inline const char *rdwr_str(int rdwr)
{
	return rdwr ? "Write" : "Read";
}
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static inline int nrec_cas(struct i5400_error_info *info)
{
	return ((info->nrecmemb) >> 16) & 0x1fff;
}
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static inline int nrec_ras(struct i5400_error_info *info)
{
	return (info->nrecmemb) & 0xffff;
}
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static inline int rec_bank(struct i5400_error_info *info)
{
	return ((info->recmema) >> 12) & 0x7;
}
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static inline int rec_rank(struct i5400_error_info *info)
{
	return ((info->recmema) >> 8) & 0xf;
}
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static inline int rec_rdwr(struct i5400_error_info *info)
{
	return (info->recmemb) >> 31;
}
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static inline int rec_cas(struct i5400_error_info *info)
{
	return ((info->recmemb) >> 16) & 0x1fff;
}
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static inline int rec_ras(struct i5400_error_info *info)
{
	return (info->recmemb) & 0xffff;
}

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static struct edac_pci_ctl_info *i5400_pci;

/*
 *      i5400_get_error_info    Retrieve the hardware error information from
 *                              the hardware and cache it in the 'info'
 *                              structure
 */


static void i5400_get_error_info(struct mem_ctl_info *mci,
				 struct i5400_error_info *info)
{
	struct i5400_pvt *pvt;
	u32 value;

	pvt = mci->pvt_info;

	/* read in the 1st FATAL error register */
	pci_read_config_dword(pvt->branchmap_werrors, FERR_FAT_FBD, &value);

	/* Mask only the bits that the doc says are valid
         */
	value &= (FERR_FAT_FBDCHAN | FERR_FAT_MASK);

	/* If there is an error, then read in the
           NEXT FATAL error register and the Memory Error Log Register A
         */
	if (value & FERR_FAT_MASK) {
		info->ferr_fat_fbd = value;

		/* harvest the various error data we need */
		pci_read_config_dword(pvt->branchmap_werrors,
				NERR_FAT_FBD, &info->nerr_fat_fbd);
		pci_read_config_word(pvt->branchmap_werrors,
				NRECMEMA, &info->nrecmema);
		pci_read_config_word(pvt->branchmap_werrors,
				NRECMEMB, &info->nrecmemb);

		/* Clear the error bits, by writing them back */
		pci_write_config_dword(pvt->branchmap_werrors,
				FERR_FAT_FBD, value);
	} else {
		info->ferr_fat_fbd = 0;
		info->nerr_fat_fbd = 0;
		info->nrecmema = 0;
		info->nrecmemb = 0;
	}

	/* read in the 1st NON-FATAL error register */
	pci_read_config_dword(pvt->branchmap_werrors, FERR_NF_FBD, &value);

	/* If there is an error, then read in the 1st NON-FATAL error
         * register as well */
	if (value & FERR_NF_MASK) {
		info->ferr_nf_fbd = value;

		/* harvest the various error data we need */
		pci_read_config_dword(pvt->branchmap_werrors,
				NERR_NF_FBD, &info->nerr_nf_fbd);
		pci_read_config_word(pvt->branchmap_werrors,
				RECMEMA, &info->recmema);
		pci_read_config_dword(pvt->branchmap_werrors,
				RECMEMB, &info->recmemb);
		pci_read_config_dword(pvt->branchmap_werrors,
				REDMEMB, &info->redmemb);

		/* Clear the error bits, by writing them back */
		pci_write_config_dword(pvt->branchmap_werrors,
				FERR_NF_FBD, value);
	} else {
		info->ferr_nf_fbd = 0;
		info->nerr_nf_fbd = 0;
		info->recmema = 0;
		info->recmemb = 0;
		info->redmemb = 0;
	}
}

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/*
 * i5400_proccess_non_recoverable_info(struct mem_ctl_info *mci,
 *                                      struct i5400_error_info *info,
 *                                      int handle_errors);
 *
 *      handle the Intel FATAL and unrecoverable errors, if any
 */


static void i5400_proccess_non_recoverable_info(struct mem_ctl_info *mci,
				    struct i5400_error_info *info,
				    unsigned long allErrors)
{
	char msg[EDAC_MC_LABEL_LEN + 1 + 90 + 80];
	int branch;
	int channel;
	int bank;
	int buf_id;
	int rank;
	int rdwr;
	int ras, cas;
	int errnum;
	char *type = NULL;
	enum hw_event_mc_err_type tp_event = HW_EVENT_ERR_UNCORRECTED;

	if (!allErrors)
		return;		/* if no error, return now */

	if (allErrors &  ERROR_FAT_MASK) {
		type = "FATAL";
		tp_event = HW_EVENT_ERR_FATAL;
	} else if (allErrors & FERR_NF_UNCORRECTABLE)
		type = "NON-FATAL uncorrected";
	else
		type = "NON-FATAL recoverable";

	/* ONLY ONE of the possible error bits will be set, as per the docs */

	branch = extract_fbdchan_indx(info->ferr_fat_fbd);
	channel = branch;

	/* Use the NON-Recoverable macros to extract data */
	bank = nrec_bank(info);
	rank = nrec_rank(info);
	buf_id = nrec_buf_id(info);
	rdwr = nrec_rdwr(info);
	ras = nrec_ras(info);
	cas = nrec_cas(info);

	edac_dbg(0, "\t\tDIMM= %d  Channels= %d,%d  (Branch= %d DRAM Bank= %d Buffer ID = %d rdwr= %s ras= %d cas= %d)\n",
		 rank, channel, channel + 1, branch >> 1, bank,
		 buf_id, rdwr_str(rdwr), ras, cas);

	/* Only 1 bit will be on */
	errnum = find_first_bit(&allErrors, ARRAY_SIZE(error_name));

	/* Form out message */
	snprintf(msg, sizeof(msg),
		 "Bank=%d Buffer ID = %d RAS=%d CAS=%d Err=0x%lx (%s)",
		 bank, buf_id, ras, cas, allErrors, error_name[errnum]);

	edac_mc_handle_error(tp_event, mci, 1, 0, 0, 0,
			     branch >> 1, -1, rank,
			     rdwr ? "Write error" : "Read error",
			     msg);
}

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/*
 * i5400_process_fatal_error_info(struct mem_ctl_info *mci,
 *                              struct i5400_error_info *info,
 *                              int handle_errors);
 *
 *      handle the Intel NON-FATAL errors, if any
 */


static void i5400_process_nonfatal_error_info(struct mem_ctl_info *mci,
					struct i5400_error_info *info)
{
	char msg[EDAC_MC_LABEL_LEN + 1 + 90 + 80];
	unsigned long allErrors;
	int branch;
	int channel;
	int bank;
	int rank;
	int rdwr;
	int ras, cas;
	int errnum;

	/* mask off the Error bits that are possible */
	allErrors = from_nf_ferr(info->ferr_nf_fbd & FERR_NF_MASK);
	if (!allErrors)
		return;		/* if no error, return now */

	/* ONLY ONE of the possible error bits will be set, as per the docs */

	if (allErrors & (ERROR_NF_UNCORRECTABLE | ERROR_NF_RECOVERABLE)) {
		i5400_proccess_non_recoverable_info(mci, info, allErrors);
		return;
	}

	/* Correctable errors */
	if (allErrors & ERROR_NF_CORRECTABLE) {
		edac_dbg(0, "\tCorrected bits= 0x%lx\n", allErrors);

		branch = extract_fbdchan_indx(info->ferr_nf_fbd);

		channel = 0;
		if (REC_ECC_LOCATOR_ODD(info->redmemb))
			channel = 1;

		/* Convert channel to be based from zero, instead of
                 * from branch base of 0 */
		channel += branch;

		bank = rec_bank(info);
		rank = rec_rank(info);
		rdwr = rec_rdwr(info);
		ras = rec_ras(info);
		cas = rec_cas(info);

		/* Only 1 bit will be on */
		errnum = find_first_bit(&allErrors, ARRAY_SIZE(error_name));

		edac_dbg(0, "\t\tDIMM= %d Channel= %d  (Branch %d DRAM Bank= %d rdwr= %s ras= %d cas= %d)\n",
			 rank, channel, branch >> 1, bank,
			 rdwr_str(rdwr), ras, cas);

		/* Form out message */
		snprintf(msg, sizeof(msg),
			 "Corrected error (Branch=%d DRAM-Bank=%d RDWR=%s "
			 "RAS=%d CAS=%d, CE Err=0x%lx (%s))",
			 branch >> 1, bank, rdwr_str(rdwr), ras, cas,
			 allErrors, error_name[errnum]);

		edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci, 1, 0, 0, 0,
				     branch >> 1, channel % 2, rank,
				     rdwr ? "Write error" : "Read error",
				     msg);

		return;
	}

	/* Miscellaneous errors */
	errnum = find_first_bit(&allErrors, ARRAY_SIZE(error_name));

	branch = extract_fbdchan_indx(info->ferr_nf_fbd);

	i5400_mc_printk(mci, KERN_EMERG,
			"Non-Fatal misc error (Branch=%d Err=%#lx (%s))",
			branch >> 1, allErrors, error_name[errnum]);
}

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/*
 *      i5400_process_error_info        Process the error info that is
 *      in the 'info' structure, previously retrieved from hardware
 */


static void i5400_process_error_info(struct mem_ctl_info *mci,
				struct i5400_error_info *info)
{	u32 allErrors;

	/* First handle any fatal errors that occurred */
	allErrors = (info->ferr_fat_fbd & FERR_FAT_MASK);
	i5400_proccess_non_recoverable_info(mci, info, allErrors);

	/* now handle any non-fatal errors that occurred */
	i5400_process_nonfatal_error_info(mci, info);
}

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/*
 *      i5400_clear_error       Retrieve any error from the hardware
 *                              but do NOT process that error.
 *                              Used for 'clearing' out of previous errors
 *                              Called by the Core module.
 */


static void i5400_clear_error(struct mem_ctl_info *mci)
{
	struct i5400_error_info info;

	i5400_get_error_info(mci, &info);
}

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/*
 *      i5400_check_error       Retrieve and process errors reported by the
 *                              hardware. Called by the Core module.
 */


static void i5400_check_error(struct mem_ctl_info *mci)
{
	struct i5400_error_info info;
	edac_dbg(4, "MC%d\n", mci->mc_idx);
	i5400_get_error_info(mci, &info);
	i5400_process_error_info(mci, &info);
}

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/*
 *      i5400_put_devices       'put' all the devices that we have
 *                              reserved via 'get'
 */


static void i5400_put_devices(struct mem_ctl_info *mci)
{
	struct i5400_pvt *pvt;

	pvt = mci->pvt_info;

	/* Decrement usage count for devices */
	pci_dev_put(pvt->branch_1);
	pci_dev_put(pvt->branch_0);
	pci_dev_put(pvt->fsb_error_regs);
	pci_dev_put(pvt->branchmap_werrors);
}

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/*
 *      i5400_get_devices       Find and perform 'get' operation on the MCH's
 *                      device/functions we want to reference for this driver
 *
 *                      Need to 'get' device 16 func 1 and func 2
 */


static int i5400_get_devices(struct mem_ctl_info *mci, int dev_idx)
{
	struct i5400_pvt *pvt;
	struct pci_dev *pdev;

	pvt = mci->pvt_info;
	pvt->branchmap_werrors = NULL;
	pvt->fsb_error_regs = NULL;
	pvt->branch_0 = NULL;
	pvt->branch_1 = NULL;

	/* Attempt to 'get' the MCH register we want */
	pdev = NULL;
	while (1) {
		pdev = pci_get_device(PCI_VENDOR_ID_INTEL,
				      PCI_DEVICE_ID_INTEL_5400_ERR, pdev);
		if (!pdev) {
			/* End of list, leave */
			i5400_printk(KERN_ERR,
				"'system address,Process Bus' "
				"device not found:"
				"vendor 0x%x device 0x%x ERR func 1 "
				"(broken BIOS?)\n",
				PCI_VENDOR_ID_INTEL,
				PCI_DEVICE_ID_INTEL_5400_ERR);
			return -ENODEV;
		}

		/* Store device 16 func 1 */
		if (PCI_FUNC(pdev->devfn) == 1)
			break;
	}
	pvt->branchmap_werrors = pdev;

	pdev = NULL;
	while (1) {
		pdev = pci_get_device(PCI_VENDOR_ID_INTEL,
				      PCI_DEVICE_ID_INTEL_5400_ERR, pdev);
		if (!pdev) {
			/* End of list, leave */
			i5400_printk(KERN_ERR,
				"'system address,Process Bus' "
				"device not found:"
				"vendor 0x%x device 0x%x ERR func 2 "
				"(broken BIOS?)\n",
				PCI_VENDOR_ID_INTEL,
				PCI_DEVICE_ID_INTEL_5400_ERR);

			pci_dev_put(pvt->branchmap_werrors);
			return -ENODEV;
		}

		/* Store device 16 func 2 */
		if (PCI_FUNC(pdev->devfn) == 2)
			break;
	}
	pvt->fsb_error_regs = pdev;

	edac_dbg(1, "System Address, processor bus- PCI Bus ID: %s  %x:%x\n",
		 pci_name(pvt->system_address),
		 pvt->system_address->vendor, pvt->system_address->device);
	edac_dbg(1, "Branchmap, control and errors - PCI Bus ID: %s  %x:%x\n",
		 pci_name(pvt->branchmap_werrors),
		 pvt->branchmap_werrors->vendor,
		 pvt->branchmap_werrors->device);
	edac_dbg(1, "FSB Error Regs - PCI Bus ID: %s  %x:%x\n",
		 pci_name(pvt->fsb_error_regs),
		 pvt->fsb_error_regs->vendor, pvt->fsb_error_regs->device);

	pvt->branch_0 = pci_get_device(PCI_VENDOR_ID_INTEL,
				       PCI_DEVICE_ID_INTEL_5400_FBD0, NULL);
	if (!pvt->branch_0) {
		i5400_printk(KERN_ERR,
			"MC: 'BRANCH 0' device not found:"
			"vendor 0x%x device 0x%x Func 0 (broken BIOS?)\n",
			PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_5400_FBD0);

		pci_dev_put(pvt->fsb_error_regs);
		pci_dev_put(pvt->branchmap_werrors);
		return -ENODEV;
	}

	/* If this device claims to have more than 2 channels then
         * fetch Branch 1's information
         */
	if (pvt->maxch < CHANNELS_PER_BRANCH)
		return 0;

	pvt->branch_1 = pci_get_device(PCI_VENDOR_ID_INTEL,
				       PCI_DEVICE_ID_INTEL_5400_FBD1, NULL);
	if (!pvt->branch_1) {
		i5400_printk(KERN_ERR,
			"MC: 'BRANCH 1' device not found:"
			"vendor 0x%x device 0x%x Func 0 "
			"(broken BIOS?)\n",
			PCI_VENDOR_ID_INTEL,
			PCI_DEVICE_ID_INTEL_5400_FBD1);

		pci_dev_put(pvt->branch_0);
		pci_dev_put(pvt->fsb_error_regs);
		pci_dev_put(pvt->branchmap_werrors);
		return -ENODEV;
	}

	return 0;
}

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/*
 *      determine_amb_present
 *
 *              the information is contained in DIMMS_PER_CHANNEL different
 *              registers determining which of the DIMMS_PER_CHANNEL requires
 *              knowing which channel is in question
 *
 *      2 branches, each with 2 channels
 *              b0_ambpresent0 for channel '0'
 *              b0_ambpresent1 for channel '1'
 *              b1_ambpresent0 for channel '2'
 *              b1_ambpresent1 for channel '3'
 */


static int determine_amb_present_reg(struct i5400_pvt *pvt, int channel)
{
	int amb_present;

	if (channel < CHANNELS_PER_BRANCH) {
		if (channel & 0x1)
			amb_present = pvt->b0_ambpresent1;
		else
			amb_present = pvt->b0_ambpresent0;
	} else {
		if (channel & 0x1)
			amb_present = pvt->b1_ambpresent1;
		else
			amb_present = pvt->b1_ambpresent0;