/* Intel i7 core/Nehalem Memory Controller kernel module
 *
 * This driver supports the memory controllers found on the Intel
 * processor families i7core, i7core 7xx/8xx, i5core, Xeon 35xx,
 * Xeon 55xx and Xeon 56xx also known as Nehalem, Nehalem-EP, Lynnfield
 * and Westmere-EP.
 *
 * This file may be distributed under the terms of the
 * GNU General Public License version 2 only.
 *
 * Copyright (c) 2009-2010 by:
 *       Mauro Carvalho Chehab
 *
 * Red Hat Inc. http://www.redhat.com
 *
 * Forked and adapted from the i5400_edac driver
 *
 * Based on the following public Intel datasheets:
 * Intel Core i7 Processor Extreme Edition and Intel Core i7 Processor
 * Datasheet, Volume 2:
 *      http://download.intel.com/design/processor/datashts/320835.pdf
 * Intel Xeon Processor 5500 Series Datasheet Volume 2
 *      http://www.intel.com/Assets/PDF/datasheet/321322.pdf
 * also available at:
 *      http://www.arrownac.com/manufacturers/intel/s/nehalem/5500-datasheet-v2.pdf
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/pci_ids.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/dmi.h>
#include <linux/edac.h>
#include <linux/mmzone.h>
#include <linux/smp.h>
#include <asm/mce.h>
#include <asm/processor.h>
#include <asm/div64.h>

#include "edac_core.h"

/* Static vars */
static LIST_HEAD(i7core_edac_list);
static DEFINE_MUTEX(i7core_edac_lock);
static int probed;

static int use_pci_fixup;
module_param(use_pci_fixup, int, 0444);
MODULE_PARM_DESC(use_pci_fixup, "Enable PCI fixup to seek for hidden devices");
/*
 * This is used for Nehalem-EP and Nehalem-EX devices, where the non-core
 * registers start at bus 255, and are not reported by BIOS.
 * We currently find devices with only 2 sockets. In order to support more QPI
 * Quick Path Interconnect, just increment this number.
 */
#define MAX_SOCKET_BUSES        2


/*
 * Alter this version for the module when modifications are made
 */
#define I7CORE_REVISION    " Ver: 1.0.0"
#define EDAC_MOD_STR      "i7core_edac"

/*
 * Debug macros
 */
#define i7core_printk(level, fmt, arg...)                       \
        edac_printk(level, "i7core", fmt, ##arg)

#define i7core_mc_printk(mci, level, fmt, arg...)               \
        edac_mc_chipset_printk(mci, level, "i7core", fmt, ##arg)

/*
 * i7core Memory Controller Registers
 */

        /* OFFSETS for Device 0 Function 0 */

#define MC_CFG_CONTROL  0x90
  #define MC_CFG_UNLOCK         0x02
  #define MC_CFG_LOCK           0x00

        /* OFFSETS for Device 3 Function 0 */

#define MC_CONTROL      0x48
#define MC_STATUS       0x4c
#define MC_MAX_DOD      0x64

/*
 * OFFSETS for Device 3 Function 4, as indicated on Xeon 5500 datasheet:
 * http://www.arrownac.com/manufacturers/intel/s/nehalem/5500-datasheet-v2.pdf
 */

#define MC_TEST_ERR_RCV1        0x60
  #define DIMM2_COR_ERR(r)                      ((r) & 0x7fff)

#define MC_TEST_ERR_RCV0        0x64
  #define DIMM1_COR_ERR(r)                      (((r) >> 16) & 0x7fff)
  #define DIMM0_COR_ERR(r)                      ((r) & 0x7fff)

/* OFFSETS for Device 3 Function 2, as indicated on Xeon 5500 datasheet */
#define MC_SSRCONTROL           0x48
  #define SSR_MODE_DISABLE      0x00
  #define SSR_MODE_ENABLE       0x01
  #define SSR_MODE_MASK         0x03

#define MC_SCRUB_CONTROL        0x4c
  #define STARTSCRUB            (1 << 24)
  #define SCRUBINTERVAL_MASK    0xffffff

#define MC_COR_ECC_CNT_0        0x80
#define MC_COR_ECC_CNT_1        0x84
#define MC_COR_ECC_CNT_2        0x88
#define MC_COR_ECC_CNT_3        0x8c
#define MC_COR_ECC_CNT_4        0x90
#define MC_COR_ECC_CNT_5        0x94

#define DIMM_TOP_COR_ERR(r)                     (((r) >> 16) & 0x7fff)
#define DIMM_BOT_COR_ERR(r)                     ((r) & 0x7fff)


        /* OFFSETS for Devices 4,5 and 6 Function 0 */

#define MC_CHANNEL_DIMM_INIT_PARAMS 0x58
  #define THREE_DIMMS_PRESENT           (1 << 24)
  #define SINGLE_QUAD_RANK_PRESENT      (1 << 23)
  #define QUAD_RANK_PRESENT             (1 << 22)
  #define REGISTERED_DIMM               (1 << 15)

#define MC_CHANNEL_MAPPER       0x60
  #define RDLCH(r, ch)          ((((r) >> (3 + (ch * 6))) & 0x07) - 1)
  #define WRLCH(r, ch)          ((((r) >> (ch * 6)) & 0x07) - 1)

#define MC_CHANNEL_RANK_PRESENT 0x7c
  #define RANK_PRESENT_MASK             0xffff

#define MC_CHANNEL_ADDR_MATCH   0xf0
#define MC_CHANNEL_ERROR_MASK   0xf8
#define MC_CHANNEL_ERROR_INJECT 0xfc
  #define INJECT_ADDR_PARITY    0x10
  #define INJECT_ECC            0x08
  #define MASK_CACHELINE        0x06
  #define MASK_FULL_CACHELINE   0x06
  #define MASK_MSB32_CACHELINE  0x04
  #define MASK_LSB32_CACHELINE  0x02
  #define NO_MASK_CACHELINE     0x00
  #define REPEAT_EN             0x01

        /* OFFSETS for Devices 4,5 and 6 Function 1 */

#define MC_DOD_CH_DIMM0         0x48
#define MC_DOD_CH_DIMM1         0x4c
#define MC_DOD_CH_DIMM2         0x50
  #define RANKOFFSET_MASK       ((1 << 12) | (1 << 11) | (1 << 10))
  #define RANKOFFSET(x)         ((x & RANKOFFSET_MASK) >> 10)
  #define DIMM_PRESENT_MASK     (1 << 9)
  #define DIMM_PRESENT(x)       (((x) & DIMM_PRESENT_MASK) >> 9)
  #define MC_DOD_NUMBANK_MASK           ((1 << 8) | (1 << 7))
  #define MC_DOD_NUMBANK(x)             (((x) & MC_DOD_NUMBANK_MASK) >> 7)
  #define MC_DOD_NUMRANK_MASK           ((1 << 6) | (1 << 5))
  #define MC_DOD_NUMRANK(x)             (((x) & MC_DOD_NUMRANK_MASK) >> 5)
  #define MC_DOD_NUMROW_MASK            ((1 << 4) | (1 << 3) | (1 << 2))
  #define MC_DOD_NUMROW(x)              (((x) & MC_DOD_NUMROW_MASK) >> 2)
  #define MC_DOD_NUMCOL_MASK            3
  #define MC_DOD_NUMCOL(x)              ((x) & MC_DOD_NUMCOL_MASK)

#define MC_RANK_PRESENT         0x7c

#define MC_SAG_CH_0     0x80
#define MC_SAG_CH_1     0x84
#define MC_SAG_CH_2     0x88
#define MC_SAG_CH_3     0x8c
#define MC_SAG_CH_4     0x90
#define MC_SAG_CH_5     0x94
#define MC_SAG_CH_6     0x98
#define MC_SAG_CH_7     0x9c

#define MC_RIR_LIMIT_CH_0       0x40
#define MC_RIR_LIMIT_CH_1       0x44
#define MC_RIR_LIMIT_CH_2       0x48
#define MC_RIR_LIMIT_CH_3       0x4C
#define MC_RIR_LIMIT_CH_4       0x50
#define MC_RIR_LIMIT_CH_5       0x54
#define MC_RIR_LIMIT_CH_6       0x58
#define MC_RIR_LIMIT_CH_7       0x5C
#define MC_RIR_LIMIT_MASK       ((1 << 10) - 1)

#define MC_RIR_WAY_CH           0x80
  #define MC_RIR_WAY_OFFSET_MASK        (((1 << 14) - 1) & ~0x7)
  #define MC_RIR_WAY_RANK_MASK          0x7

/*
 * i7core structs
 */

#define NUM_CHANS 3
#define MAX_DIMMS 3             /* Max DIMMS per channel */
#define MAX_MCR_FUNC  4
#define MAX_CHAN_FUNC 3

struct i7core_info {
        u32     mc_control;
        u32     mc_status;
        u32     max_dod;
        u32     ch_map;
};


struct i7core_inject {
        int     enable;

        u32     section;
        u32     type;
        u32     eccmask;

        /* Error address mask */
        int channel, dimm, rank, bank, page, col;
};

struct i7core_channel {
        bool            is_3dimms_present;
        bool            is_single_4rank;
        bool            has_4rank;
        u32             dimms;
};

struct pci_id_descr {
        int                     dev;
        int                     func;
        int                     dev_id;
        int                     optional;
};

struct pci_id_table {
        const struct pci_id_descr       *descr;
        int                             n_devs;
};

struct i7core_dev {
        struct list_head        list;
        u8                      socket;
        struct pci_dev          **pdev;
        int                     n_devs;
        struct mem_ctl_info     *mci;
};

struct i7core_pvt {
        struct device *addrmatch_dev, *chancounts_dev;

        struct pci_dev  *pci_noncore;
        struct pci_dev  *pci_mcr[MAX_MCR_FUNC + 1];
        struct pci_dev  *pci_ch[NUM_CHANS][MAX_CHAN_FUNC + 1];

        struct i7core_dev *i7core_dev;

        struct i7core_info      info;
        struct i7core_inject    inject;
        struct i7core_channel   channel[NUM_CHANS];

        int             ce_count_available;

                        /* ECC corrected errors counts per udimm */
        unsigned long   udimm_ce_count[MAX_DIMMS];
        int             udimm_last_ce_count[MAX_DIMMS];
                        /* ECC corrected errors counts per rdimm */
        unsigned long   rdimm_ce_count[NUM_CHANS][MAX_DIMMS];
        int             rdimm_last_ce_count[NUM_CHANS][MAX_DIMMS];

        bool            is_registered, enable_scrub;

        /* Fifo double buffers */
        struct mce              mce_entry[MCE_LOG_LEN];
        struct mce              mce_outentry[MCE_LOG_LEN];

        /* Fifo in/out counters */
        unsigned                mce_in, mce_out;

        /* Count indicator to show errors not got */
        unsigned                mce_overrun;

        /* DCLK Frequency used for computing scrub rate */
        int                     dclk_freq;

        /* Struct to control EDAC polling */
        struct edac_pci_ctl_info *i7core_pci;
};

#define PCI_DESCR(device, function, device_id)  \
        .dev = (device),                        \
        .func = (function),                     \
        .dev_id = (device_id)

static const struct pci_id_descr pci_dev_descr_i7core_nehalem[] = {
                /* Memory controller */
        { PCI_DESCR(3, 0, PCI_DEVICE_ID_INTEL_I7_MCR)     },
        { PCI_DESCR(3, 1, PCI_DEVICE_ID_INTEL_I7_MC_TAD)  },
                        /* Exists only for RDIMM */
        { PCI_DESCR(3, 2, PCI_DEVICE_ID_INTEL_I7_MC_RAS), .optional = 1  },
        { PCI_DESCR(3, 4, PCI_DEVICE_ID_INTEL_I7_MC_TEST) },

                /* Channel 0 */
        { PCI_DESCR(4, 0, PCI_DEVICE_ID_INTEL_I7_MC_CH0_CTRL) },
        { PCI_DESCR(4, 1, PCI_DEVICE_ID_INTEL_I7_MC_CH0_ADDR) },
        { PCI_DESCR(4, 2, PCI_DEVICE_ID_INTEL_I7_MC_CH0_RANK) },
        { PCI_DESCR(4, 3, PCI_DEVICE_ID_INTEL_I7_MC_CH0_TC)   },

                /* Channel 1 */
        { PCI_DESCR(5, 0, PCI_DEVICE_ID_INTEL_I7_MC_CH1_CTRL) },
        { PCI_DESCR(5, 1, PCI_DEVICE_ID_INTEL_I7_MC_CH1_ADDR) },
        { PCI_DESCR(5, 2, PCI_DEVICE_ID_INTEL_I7_MC_CH1_RANK) },
        { PCI_DESCR(5, 3, PCI_DEVICE_ID_INTEL_I7_MC_CH1_TC)   },

                /* Channel 2 */
        { PCI_DESCR(6, 0, PCI_DEVICE_ID_INTEL_I7_MC_CH2_CTRL) },
        { PCI_DESCR(6, 1, PCI_DEVICE_ID_INTEL_I7_MC_CH2_ADDR) },
        { PCI_DESCR(6, 2, PCI_DEVICE_ID_INTEL_I7_MC_CH2_RANK) },
        { PCI_DESCR(6, 3, PCI_DEVICE_ID_INTEL_I7_MC_CH2_TC)   },

                /* Generic Non-core registers */
        /*
         * This is the PCI device on i7core and on Xeon 35xx (8086:2c41)
         * On Xeon 55xx, however, it has a different id (8086:2c40). So,
         * the probing code needs to test for the other address in case of
         * failure of this one
         */
        { PCI_DESCR(0, 0, PCI_DEVICE_ID_INTEL_I7_NONCORE)  },

};

static const struct pci_id_descr pci_dev_descr_lynnfield[] = {
        { PCI_DESCR( 3, 0, PCI_DEVICE_ID_INTEL_LYNNFIELD_MCR)         },
        { PCI_DESCR( 3, 1, PCI_DEVICE_ID_INTEL_LYNNFIELD_MC_TAD)      },
        { PCI_DESCR( 3, 4, PCI_DEVICE_ID_INTEL_LYNNFIELD_MC_TEST)     },

        { PCI_DESCR( 4, 0, PCI_DEVICE_ID_INTEL_LYNNFIELD_MC_CH0_CTRL) },
        { PCI_DESCR( 4, 1, PCI_DEVICE_ID_INTEL_LYNNFIELD_MC_CH0_ADDR) },
        { PCI_DESCR( 4, 2, PCI_DEVICE_ID_INTEL_LYNNFIELD_MC_CH0_RANK) },
        { PCI_DESCR( 4, 3, PCI_DEVICE_ID_INTEL_LYNNFIELD_MC_CH0_TC)   },

        { PCI_DESCR( 5, 0, PCI_DEVICE_ID_INTEL_LYNNFIELD_MC_CH1_CTRL) },
        { PCI_DESCR( 5, 1, PCI_DEVICE_ID_INTEL_LYNNFIELD_MC_CH1_ADDR) },
        { PCI_DESCR( 5, 2, PCI_DEVICE_ID_INTEL_LYNNFIELD_MC_CH1_RANK) },
        { PCI_DESCR( 5, 3, PCI_DEVICE_ID_INTEL_LYNNFIELD_MC_CH1_TC)   },

        /*
         * This is the PCI device has an alternate address on some
         * processors like Core i7 860
         */
        { PCI_DESCR( 0, 0, PCI_DEVICE_ID_INTEL_LYNNFIELD_NONCORE)     },
};

static const struct pci_id_descr pci_dev_descr_i7core_westmere[] = {
                /* Memory controller */
        { PCI_DESCR(3, 0, PCI_DEVICE_ID_INTEL_LYNNFIELD_MCR_REV2)     },
        { PCI_DESCR(3, 1, PCI_DEVICE_ID_INTEL_LYNNFIELD_MC_TAD_REV2)  },
                        /* Exists only for RDIMM */
        { PCI_DESCR(3, 2, PCI_DEVICE_ID_INTEL_LYNNFIELD_MC_RAS_REV2), .optional = 1  },
        { PCI_DESCR(3, 4, PCI_DEVICE_ID_INTEL_LYNNFIELD_MC_TEST_REV2) },

                /* Channel 0 */
        { PCI_DESCR(4, 0, PCI_DEVICE_ID_INTEL_LYNNFIELD_MC_CH0_CTRL_REV2) },
        { PCI_DESCR(4, 1, PCI_DEVICE_ID_INTEL_LYNNFIELD_MC_CH0_ADDR_REV2) },
        { PCI_DESCR(4, 2, PCI_DEVICE_ID_INTEL_LYNNFIELD_MC_CH0_RANK_REV2) },
        { PCI_DESCR(4, 3, PCI_DEVICE_ID_INTEL_LYNNFIELD_MC_CH0_TC_REV2)   },

                /* Channel 1 */
        { PCI_DESCR(5, 0, PCI_DEVICE_ID_INTEL_LYNNFIELD_MC_CH1_CTRL_REV2) },
        { PCI_DESCR(5, 1, PCI_DEVICE_ID_INTEL_LYNNFIELD_MC_CH1_ADDR_REV2) },
        { PCI_DESCR(5, 2, PCI_DEVICE_ID_INTEL_LYNNFIELD_MC_CH1_RANK_REV2) },
        { PCI_DESCR(5, 3, PCI_DEVICE_ID_INTEL_LYNNFIELD_MC_CH1_TC_REV2)   },

                /* Channel 2 */
        { PCI_DESCR(6, 0, PCI_DEVICE_ID_INTEL_LYNNFIELD_MC_CH2_CTRL_REV2) },
        { PCI_DESCR(6, 1, PCI_DEVICE_ID_INTEL_LYNNFIELD_MC_CH2_ADDR_REV2) },
        { PCI_DESCR(6, 2, PCI_DEVICE_ID_INTEL_LYNNFIELD_MC_CH2_RANK_REV2) },
        { PCI_DESCR(6, 3, PCI_DEVICE_ID_INTEL_LYNNFIELD_MC_CH2_TC_REV2)   },

                /* Generic Non-core registers */
        { PCI_DESCR(0, 0, PCI_DEVICE_ID_INTEL_LYNNFIELD_NONCORE_REV2)  },

};

#define PCI_ID_TABLE_ENTRY(A) { .descr=A, .n_devs = ARRAY_SIZE(A) }
static const struct pci_id_table pci_dev_table[] = {
        PCI_ID_TABLE_ENTRY(pci_dev_descr_i7core_nehalem),
        PCI_ID_TABLE_ENTRY(pci_dev_descr_lynnfield),
        PCI_ID_TABLE_ENTRY(pci_dev_descr_i7core_westmere),
        {0,}                    /* 0 terminated list. */
};

/*
 *      pci_device_id   table for which devices we are looking for
 */
static const struct pci_device_id i7core_pci_tbl[] = {
        {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_X58_HUB_MGMT)},
        {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_LYNNFIELD_QPI_LINK0)},
        {0,}                    /* 0 terminated list. */
};

/****************************************************************************
                        Ancillary status routines
 ****************************************************************************/

        /* MC_CONTROL bits */
#define CH_ACTIVE(pvt, ch)      ((pvt)->info.mc_control & (1 << (8 + ch)))
#define ECCx8(pvt)              ((pvt)->info.mc_control & (1 << 1))

        /* MC_STATUS bits */
#define ECC_ENABLED(pvt)        ((pvt)->info.mc_status & (1 << 4))
#define CH_DISABLED(pvt, ch)    ((pvt)->info.mc_status & (1 << ch))

        /* MC_MAX_DOD read functions */
static inline int numdimms(u32 dimms)
{
        return (dimms & 0x3) + 1;
}

static inline int numrank(u32 rank)
{
        static const int ranks[] = { 1, 2, 4, -EINVAL };

        return ranks[rank & 0x3];
}

static inline int numbank(u32 bank)
{
        static const int banks[] = { 4, 8, 16, -EINVAL };

        return banks[bank & 0x3];
}

static inline int numrow(u32 row)
{
        static const int rows[] = {
                1 << 12, 1 << 13, 1 << 14, 1 << 15,
                1 << 16, -EINVAL, -EINVAL, -EINVAL,
        };

        return rows[row & 0x7];
}

static inline int numcol(u32 col)
{
        static const int cols[] = {
                1 << 10, 1 << 11, 1 << 12, -EINVAL,
        };
        return cols[col & 0x3];
}

static struct i7core_dev *get_i7core_dev(u8 socket)
{
        struct i7core_dev *i7core_dev;

        list_for_each_entry(i7core_dev, &i7core_edac_list, list) {
                if (i7core_dev->socket == socket)
                        return i7core_dev;
        }

        return NULL;
}

static struct i7core_dev *alloc_i7core_dev(u8 socket,
                                           const struct pci_id_table *table)
{
        struct i7core_dev *i7core_dev;

        i7core_dev = kzalloc(sizeof(*i7core_dev), GFP_KERNEL);
        if (!i7core_dev)
                return NULL;

        i7core_dev->pdev = kzalloc(sizeof(*i7core_dev->pdev) * table->n_devs,
                                   GFP_KERNEL);
        if (!i7core_dev->pdev) {
                kfree(i7core_dev);
                return NULL;
        }

        i7core_dev->socket = socket;
        i7core_dev->n_devs = table->n_devs;
        list_add_tail(&i7core_dev->list, &i7core_edac_list);

        return i7core_dev;
}

static void free_i7core_dev(struct i7core_dev *i7core_dev)
{
        list_del(&i7core_dev->list);
        kfree(i7core_dev->pdev);
        kfree(i7core_dev);
}

/****************************************************************************
                        Memory check routines
 ****************************************************************************/

static int get_dimm_config(struct mem_ctl_info *mci)
{
        struct i7core_pvt *pvt = mci->pvt_info;
        struct pci_dev *pdev;
        int i, j;
        enum edac_type mode;
        enum mem_type mtype;
        struct dimm_info *dimm;

        /* Get data from the MC register, function 0 */
        pdev = pvt->pci_mcr[0];
        if (!pdev)
                return -ENODEV;

        /* Device 3 function 0 reads */
        pci_read_config_dword(pdev, MC_CONTROL, &pvt->info.mc_control);
        pci_read_config_dword(pdev, MC_STATUS, &pvt->info.mc_status);
        pci_read_config_dword(pdev, MC_MAX_DOD, &pvt->info.max_dod);
        pci_read_config_dword(pdev, MC_CHANNEL_MAPPER, &pvt->info.ch_map);

        edac_dbg(0, "QPI %d control=0x%08x status=0x%08x dod=0x%08x map=0x%08x\n",
                 pvt->i7core_dev->socket, pvt->info.mc_control,
                 pvt->info.mc_status, pvt->info.max_dod, pvt->info.ch_map);

        if (ECC_ENABLED(pvt)) {
                edac_dbg(0, "ECC enabled with x%d SDCC\n", ECCx8(pvt) ? 8 : 4);
                if (ECCx8(pvt))
                        mode = EDAC_S8ECD8ED;
                else
                        mode = EDAC_S4ECD4ED;
        } else {
                edac_dbg(0, "ECC disabled\n");
                mode = EDAC_NONE;
        }

        /* FIXME: need to handle the error codes */
        edac_dbg(0, "DOD Max limits: DIMMS: %d, %d-ranked, %d-banked x%x x 0x%x\n",
                 numdimms(pvt->info.max_dod),
                 numrank(pvt->info.max_dod >> 2),
                 numbank(pvt->info.max_dod >> 4),
                 numrow(pvt->info.max_dod >> 6),
                 numcol(pvt->info.max_dod >> 9));

        for (i = 0; i < NUM_CHANS; i++) {
                u32 data, dimm_dod[3], value[8];

                if (!pvt->pci_ch[i][0])
                        continue;

                if (!CH_ACTIVE(pvt, i)) {
                        edac_dbg(0, "Channel %i is not active\n", i);
                        continue;
                }
                if (CH_DISABLED(pvt, i)) {
                        edac_dbg(0, "Channel %i is disabled\n", i);
                        continue;
                }

                /* Devices 4-6 function 0 */
                pci_read_config_dword(pvt->pci_ch[i][0],
                                MC_CHANNEL_DIMM_INIT_PARAMS, &data);


                if (data & THREE_DIMMS_PRESENT)
                        pvt->channel[i].is_3dimms_present = true;

                if (data & SINGLE_QUAD_RANK_PRESENT)
                        pvt->channel[i].is_single_4rank = true;

                if (data & QUAD_RANK_PRESENT)
                        pvt->channel[i].has_4rank = true;

                if (data & REGISTERED_DIMM)
                        mtype = MEM_RDDR3;
                else
                        mtype = MEM_DDR3;

                /* Devices 4-6 function 1 */
                pci_read_config_dword(pvt->pci_ch[i][1],
                                MC_DOD_CH_DIMM0, &dimm_dod[0]);
                pci_read_config_dword(pvt->pci_ch[i][1],
                                MC_DOD_CH_DIMM1, &dimm_dod[1]);
                pci_read_config_dword(pvt->pci_ch[i][1],
                                MC_DOD_CH_DIMM2, &dimm_dod[2]);

                edac_dbg(0, "Ch%d phy rd%d, wr%d (0x%08x): %s%s%s%cDIMMs\n",
                         i,
                         RDLCH(pvt->info.ch_map, i), WRLCH(pvt->info.ch_map, i),
                         data,
                         pvt->channel[i].is_3dimms_present ? "3DIMMS " : "",
                         pvt->channel[i].is_3dimms_present ? "SINGLE_4R " : "",
                         pvt->channel[i].has_4rank ? "HAS_4R " : "",
                         (data & REGISTERED_DIMM) ? 'R' : 'U');

                for (j = 0; j < 3; j++) {
                        u32 banks, ranks, rows, cols;
                        u32 size, npages;

                        if (!DIMM_PRESENT(dimm_dod[j]))
                                continue;

                        dimm = EDAC_DIMM_PTR(mci->layers, mci->dimms, mci->n_layers,
                                       i, j, 0);
                        banks = numbank(MC_DOD_NUMBANK(dimm_dod[j]));
                        ranks = numrank(MC_DOD_NUMRANK(dimm_dod[j]));
                        rows = numrow(MC_DOD_NUMROW(dimm_dod[j]));
                        cols = numcol(MC_DOD_NUMCOL(dimm_dod[j]));

                        /* DDR3 has 8 I/O banks */
                        size = (rows * cols * banks * ranks) >> (20 - 3);

                        edac_dbg(0, "\tdimm %d %d Mb offset: %x, bank: %d, rank: %d, row: %#x, col: %#x\n",
                                 j, size,
                                 RANKOFFSET(dimm_dod[j]),
                                 banks, ranks, rows, cols);

                        npages = MiB_TO_PAGES(size);

                        dimm->nr_pages = npages;

                        switch (banks) {
                        case 4:
                                dimm->dtype = DEV_X4;
                                break;
                        case 8:
                                dimm->dtype = DEV_X8;
                                break;
                        case 16:
                                dimm->dtype = DEV_X16;
                                break;
                        default:
                                dimm->dtype = DEV_UNKNOWN;
                        }

                        snprintf(dimm->label, sizeof(dimm->label),
                                 "CPU#%uChannel#%u_DIMM#%u",
                                 pvt->i7core_dev->socket, i, j);
                        dimm->grain = 8;
                        dimm->edac_mode = mode;
                        dimm->mtype = mtype;
                }

                pci_read_config_dword(pdev, MC_SAG_CH_0, &value[0]);
                pci_read_config_dword(pdev, MC_SAG_CH_1, &value[1]);
                pci_read_config_dword(pdev, MC_SAG_CH_2, &value[2]);
                pci_read_config_dword(pdev, MC_SAG_CH_3, &value[3]);
                pci_read_config_dword(pdev, MC_SAG_CH_4, &value[4]);
                pci_read_config_dword(pdev, MC_SAG_CH_5, &value[5]);
                pci_read_config_dword(pdev, MC_SAG_CH_6, &value[6]);
                pci_read_config_dword(pdev, MC_SAG_CH_7, &value[7]);
                edac_dbg(1, "\t[%i] DIVBY3\tREMOVED\tOFFSET\n", i);
                for (j = 0; j < 8; j++)
                        edac_dbg(1, "\t\t%#x\t%#x\t%#x\n",
                                 (value[j] >> 27) & 0x1,
                                 (value[j] >> 24) & 0x7,
                                 (value[j] & ((1 << 24) - 1)));
        }

        return 0;
}

/****************************************************************************
                        Error insertion routines
 ****************************************************************************/

#define to_mci(k) container_of(k, struct mem_ctl_info, dev)

/* The i7core has independent error injection features per channel.
   However, to have a simpler code, we don't allow enabling error injection
   on more than one channel.
   Also, since a change at an inject parameter will be applied only at enable,
   we're disabling error injection on all write calls to the sysfs nodes that
   controls the error code injection.
 */
static int disable_inject(const struct mem_ctl_info *mci)
{
        struct i7core_pvt *pvt = mci->pvt_info;

        pvt->inject.enable = 0;

        if (!pvt->pci_ch[pvt->inject.channel][0])
                return -ENODEV;

        pci_write_config_dword(pvt->pci_ch[pvt->inject.channel][0],
                                MC_CHANNEL_ERROR_INJECT, 0);

        return 0;
}

/*
 * i7core inject inject.section
 *
 *      accept and store error injection inject.section value
 *      bit 0 - refers to the lower 32-byte half cacheline
 *      bit 1 - refers to the upper 32-byte half cacheline
 */
static ssize_t i7core_inject_section_store(struct device *dev,
                                           struct device_attribute *mattr,
                                           const char *data, size_t count)
{
        struct mem_ctl_info *mci = to_mci(dev);
        struct i7core_pvt *pvt = mci->pvt_info;
        unsigned long value;
        int rc;

        if (pvt->inject.enable)
                disable_inject(mci);

        rc = kstrtoul(data, 10, &value);
        if ((rc < 0) || (value > 3))
                return -EIO;

        pvt->inject.section = (u32) value;
        return count;
}

static ssize_t i7core_inject_section_show(struct device *dev,
                                          struct device_attribute *mattr,
                                          char *data)
{
        struct mem_ctl_info *mci = to_mci(dev);
        struct i7core_pvt *pvt = mci->pvt_info;
        return sprintf(data, "0x%08x\n", pvt->inject.section);
}

/*
 * i7core inject.type
 *
 *      accept and store error injection inject.section value
 *      bit 0 - repeat enable - Enable error repetition
 *      bit 1 - inject ECC error
 *      bit 2 - inject parity error
 */
static ssize_t i7core_inject_type_store(struct device *dev,
                                        struct device_attribute *mattr,
                                        const char *data, size_t count)
{
        struct mem_ctl_info *mci = to_mci(dev);
struct i7core_pvt *pvt = mci->pvt_info;
        unsigned long value;
        int rc;

        if (pvt->inject.enable)
                disable_inject(mci);

        rc = kstrtoul(data, 10, &value);
        if ((rc < 0) || (value > 7))
                return -EIO;

        pvt->inject.type = (u32) value;
        return count;
}

static ssize_t i7core_inject_type_show(struct device *dev,
                                       struct device_attribute *mattr,
                                       char *data)
{
        struct mem_ctl_info *mci = to_mci(dev);
        struct i7core_pvt *pvt = mci->pvt_info;

        return sprintf(data, "0x%08x\n", pvt->inject.type);
}

/*
 * i7core_inject_inject.eccmask_store
 *
 * The type of error (UE/CE) will depend on the inject.eccmask value:
 *   Any bits set to a 1 will flip the corresponding ECC bit
 *   Correctable errors can be injected by flipping 1 bit or the bits within
 *   a symbol pair (2 consecutive aligned 8-bit pairs - i.e. 7:0 and 15:8 or
 *   23:16 and 31:24). Flipping bits in two symbol pairs will cause an
 *   uncorrectable error to be injected.
 */
static ssize_t i7core_inject_eccmask_store(struct device *dev,
                                           struct device_attribute *mattr,
                                           const char *data, size_t count)
{
        struct mem_ctl_info *mci = to_mci(dev);
        struct i7core_pvt *pvt = mci->pvt_info;
        unsigned long value;
        int rc;

        if (pvt->inject.enable)
                disable_inject(mci);

        rc = kstrtoul(data, 10, &value);
        if (rc < 0)
                return -EIO;

        pvt->inject.eccmask = (u32) value;
        return count;
}

static ssize_t i7core_inject_eccmask_show(struct device *dev,
                                          struct device_attribute *mattr,
                                          char *data)
{
        struct mem_ctl_info *mci = to_mci(dev);
        struct i7core_pvt *pvt = mci->pvt_info;

        return sprintf(data, "0x%08x\n", pvt->inject.eccmask);
}

/*
 * i7core_addrmatch
 *
 * The type of error (UE/CE) will depend on the inject.eccmask value:
 *   Any bits set to a 1 will flip the corresponding ECC bit
 *   Correctable errors can be injected by flipping 1 bit or the bits within
 *   a symbol pair (2 consecutive aligned 8-bit pairs - i.e. 7:0 and 15:8 or
 *   23:16 and 31:24). Flipping bits in two symbol pairs will cause an
 *   uncorrectable error to be injected.
 */

#define DECLARE_ADDR_MATCH(param, limit)                        \
static ssize_t i7core_inject_store_##param(                     \
        struct device *dev,                                     \
        struct device_attribute *mattr,                         \
        const char *data, size_t count)                         \
{                                                               \
        struct mem_ctl_info *mci = dev_get_drvdata(dev);        \
        struct i7core_pvt *pvt;                                 \
        long value;                                             \
        int rc;                                                 \
                                                                \
        edac_dbg(1, "\n");                                      \
        pvt = mci->pvt_info;                                    \
                                                                \
        if (pvt->inject.enable)                                 \
                disable_inject(mci);                            \
                                                                \
        if (!strcasecmp(data, "any") || !strcasecmp(data, "any\n"))\
                value = -1;                                     \
        else {                                                  \
                rc = kstrtoul(data, 10, &value);                \
                if ((rc < 0) || (value >= limit))               \
                        return -EIO;                            \
        }                                                       \
                                                                \
        pvt->inject.param = value;                              \
                                                                \
        return count;                                           \
}                                                               \
                                                                \
static ssize_t i7core_inject_show_##param(                      \
        struct device *dev,                                     \
        struct device_attribute *mattr,                         \
        char *data)                                             \
{                                                               \
        struct mem_ctl_info *mci = dev_get_drvdata(dev);        \
        struct i7core_pvt *pvt;                                 \
                                                                \
        pvt = mci->pvt_info;                                    \
        edac_dbg(1, "pvt=%p\n", pvt);                           \
        if (pvt->inject.param < 0)                              \
                return sprintf(data, "any\n");                  \
        else                                                    \
                return sprintf(data, "%d\n", pvt->inject.param);\
}

#define ATTR_ADDR_MATCH(param)                                  \
        static DEVICE_ATTR(param, S_IRUGO | S_IWUSR,            \
                    i7core_inject_show_##param,                 \
                    i7core_inject_store_##param)

DECLARE_ADDR_MATCH(channel, 3);
DECLARE_ADDR_MATCH(dimm, 3);
DECLARE_ADDR_MATCH(rank, 4);
DECLARE_ADDR_MATCH(bank, 32);
DECLARE_ADDR_MATCH(page, 0x10000);
DECLARE_ADDR_MATCH(col, 0x4000);

ATTR_ADDR_MATCH(channel);
ATTR_ADDR_MATCH(dimm);
ATTR_ADDR_MATCH(rank);
ATTR_ADDR_MATCH(bank);
ATTR_ADDR_MATCH(page);
ATTR_ADDR_MATCH(col);

static int write_and_test(struct pci_dev *dev, const int where, const u32 val)
{
        u32 read;
        int count;

        edac_dbg(0, "setting pci %02x:%02x.%x reg=%02x value=%08x\n",
                 dev->bus->number, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn),
                 where, val);

        for (count = 0; count < 10; count++) {
                if (count)
                        msleep(100);
                pci_write_config_dword(dev, where, val);
                pci_read_config_dword(dev, where, &read);

                if (read == val)
                        return 0;
        }

        i7core_printk(KERN_ERR, "Error during set pci %02x:%02x.%x reg=%02x "
                "write=%08x. Read=%08x\n",
                dev->bus->number, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn),
                where, val, read);

        return -EINVAL;
}

/*
 * This routine prepares the Memory Controller for error injection.
 * The error will be injected when some process tries to write to the
 * memory that matches the given criteria.
 * The criteria can be set in terms of a mask where dimm, rank, bank, page
 * and col can be specified.
 * A -1 value for any of the mask items will make the MCU to ignore
 * that matching criteria for error injection.
 *
 * It should be noticed that the error will only happen after a write operation
 * on a memory that matches the condition. if REPEAT_EN is not enabled at
 * inject mask, then it will produce just one error. Otherwise, it will repeat
 * until the injectmask would be cleaned.
 *
 * FIXME: This routine assumes that MAXNUMDIMMS value of MC_MAX_DOD
 *    is reliable enough to check if the MC is using the
 *    three channels. However, this is not clear at the datasheet.
 */
static ssize_t i7core_inject_enable_store(struct device *dev,
                                          struct device_attribute *mattr,
                                          const char *data, size_t count)
{
        struct mem_ctl_info *mci = to_mci(dev);
        struct i7core_pvt *pvt = mci->pvt_info;
        u32 injectmask;
        u64 mask = 0;
        int  rc;
        long enable;

        if (!pvt->pci_ch[pvt->inject.channel][0])
                return 0;

        rc = kstrtoul(data, 10, &enable);
        if ((rc < 0))
                return 0;

        if (enable) {
                pvt->inject.enable = 1;
        } else {
                disable_inject(mci);
                return count;
        }

        /* Sets pvt->inject.dimm mask */
        if (pvt->inject.dimm < 0)
                mask |= 1LL << 41;
        else {
                if (pvt->channel[pvt->inject.channel].dimms > 2)
                        mask |= (pvt->inject.dimm & 0x3LL) << 35;
                else
                        mask |= (pvt->inject.dimm & 0x1LL) << 36;
        }

        /* Sets pvt->inject.rank mask */
        if (pvt->inject.rank < 0)
                mask |= 1LL << 40;
        else {
                if (pvt->channel[pvt->inject.channel].dimms > 2)
                        mask |= (pvt->inject.rank & 0x1LL) << 34;
                else
                        mask |= (pvt->inject.rank & 0x3LL) << 34;
        }

        /* Sets pvt->inject.bank mask */
        if (pvt->inject.bank < 0)
                mask |= 1LL << 39;
        else
                mask |= (pvt->inject.bank & 0x15LL) << 30;

        /* Sets pvt->inject.page mask */
        if (pvt->inject.page < 0)
                mask |= 1LL << 38;
        else
                mask |= (pvt->inject.page & 0xffff) << 14;

        /* Sets pvt->inject.column mask */
        if (pvt->inject.col < 0)
                mask |= 1LL << 37;
        else
                mask |= (pvt->inject.col & 0x3fff);

        /*
         * bit    0: REPEAT_EN
         * bits 1-2: MASK_HALF_CACHELINE
         * bit    3: INJECT_ECC
         * bit    4: INJECT_ADDR_PARITY
         */

        injectmask = (pvt->inject.type & 1) |
                     (pvt->inject.section & 0x3) << 1 |
                     (pvt->inject.type & 0x6) << (3 - 1);

        /* Unlock writes to registers - this register is write only */
        pci_write_config_dword(pvt->pci_noncore,
                               MC_CFG_CONTROL, 0x2);

        write_and_test(pvt->pci_ch[pvt->inject.channel][0],
                               MC_CHANNEL_ADDR_MATCH, mask);
        write_and_test(pvt->pci_ch[pvt->inject.channel][0],
                               MC_CHANNEL_ADDR_MATCH + 4, mask >> 32L);

        write_and_test(pvt->pci_ch[pvt->inject.channel][0],
                               MC_CHANNEL_ERROR_MASK, pvt->inject.eccmask);

        write_and_test(pvt->pci_ch[pvt->inject.channel][0],
                               MC_CHANNEL_ERROR_INJECT, injectmask);

        /*
         * This is something undocumented, based on my tests
         * Without writing 8 to this register, errors aren't injected. Not sure
         * why.
         */
        pci_write_config_dword(pvt->pci_noncore,
                               MC_CFG_CONTROL, 8);

        edac_dbg(0, "Error inject addr match 0x%016llx, ecc 0x%08x, inject 0x%08x\n",
                 mask, pvt->inject.eccmask, injectmask);


        return count;
}

static ssize_t i7core_inject_enable_show(struct device *dev,
                                         struct device_attribute *mattr,
                                         char *data)
{
        struct mem_ctl_info *mci = to_mci(dev);
        struct i7core_pvt *pvt = mci->pvt_info;
        u32 injectmask;

        if (!pvt->pci_ch[pvt->inject.channel][0])
                return 0;

        pci_read_config_dword(pvt->pci_ch[pvt->inject.channel][0],
                               MC_CHANNEL_ERROR_INJECT, &injectmask);

        edac_dbg(0, "Inject error read: 0x%018x\n", injectmask);

        if (injectmask & 0x0c)
                pvt->inject.enable = 1;

        return sprintf(data, "%d\n", pvt->inject.enable);
}

#define DECLARE_COUNTER(param)                                  \
static ssize_t i7core_show_counter_##param(                     \
        struct device *dev,                                     \
        struct device_attribute *mattr,                         \
        char *data)                                             \
{                                                               \
        struct mem_ctl_info *mci = dev_get_drvdata(dev);        \
        struct i7core_pvt *pvt = mci->pvt_info;                 \
                                                                \
        edac_dbg(1, "\n");                                      \
        if (!pvt->ce_count_available || (pvt->is_registered))   \
                return sprintf(data, "data unavailable\n");     \
        return sprintf(data, "%lu\n",                           \
                        pvt->udimm_ce_count[param]);            \
}

#define ATTR_COUNTER(param)                                     \
        static DEVICE_ATTR(udimm##param, S_IRUGO | S_IWUSR,     \
                    i7core_show_counter_##param,                \
                    NULL)

DECLARE_COUNTER(0);
DECLARE_COUNTER(1);
DECLARE_COUNTER(2);

ATTR_COUNTER(0);
ATTR_COUNTER(1);
ATTR_COUNTER(2);

/*
 * inject_addrmatch device sysfs struct
 */

static struct attribute *i7core_addrmatch_attrs[] = {
        &dev_attr_channel.attr,
        &dev_attr_dimm.attr,
        &dev_attr_rank.attr,
        &dev_attr_bank.attr,
        &dev_attr_page.attr,
        &dev_attr_col.attr,
        NULL
};

static struct attribute_group addrmatch_grp = {
        .attrs  = i7core_addrmatch_attrs,
};

static const struct attribute_group *addrmatch_groups[] = {
        &addrmatch_grp,
        NULL
};

static void addrmatch_release(struct device *device)
{
        edac_dbg(1, "Releasing device %s\n", dev_name(device));
        kfree(device);
}

static struct device_type addrmatch_type = {
        .groups         = addrmatch_groups,
        .release        = addrmatch_release,
};

/*
 * all_channel_counts sysfs struct
 */

static struct attribute *i7core_udimm_counters_attrs[] = {
        &dev_attr_udimm0.attr,
        &dev_attr_udimm1.attr,
        &dev_attr_udimm2.attr,
        NULL
};

static struct attribute_group all_channel_counts_grp = {
        .attrs  = i7core_udimm_counters_attrs,
};

static const struct attribute_group *all_channel_counts_groups[] = {
        &all_channel_counts_grp,
        NULL
};

static void all_channel_counts_release(struct device *device)
{
        edac_dbg(1, "Releasing device %s\n", dev_name(device));
        kfree(device);
}

static struct device_type all_channel_counts_type = {
        .groups         = all_channel_counts_groups,
        .release        = all_channel_counts_release,
};

/*
 * inject sysfs attributes
 */

static DEVICE_ATTR(inject_section, S_IRUGO | S_IWUSR,
                   i7core_inject_section_show, i7core_inject_section_store);

static DEVICE_ATTR(inject_type, S_IRUGO | S_IWUSR,
                   i7core_inject_type_show, i7core_inject_type_store);


static DEVICE_ATTR(inject_eccmask, S_IRUGO | S_IWUSR,
                   i7core_inject_eccmask_show, i7core_inject_eccmask_store);

static DEVICE_ATTR(inject_enable, S_IRUGO | S_IWUSR,
                   i7core_inject_enable_show, i7core_inject_enable_store);

static int i7core_create_sysfs_devices(struct mem_ctl_info *mci)
{
        struct i7core_pvt *pvt = mci->pvt_info;
        int rc;

        rc = device_create_file(&mci->dev, &dev_attr_inject_section);
        if (rc < 0)
                return rc;
        rc = device_create_file(&mci->dev, &dev_attr_inject_type);
        if (rc < 0)
                return rc;
        rc = device_create_file(&mci->dev, &dev_attr_inject_eccmask);
        if (rc < 0)
                return rc;
        rc = device_create_file(&mci->dev, &dev_attr_inject_enable);
        if (rc < 0)
                return rc;

        pvt->addrmatch_dev = kzalloc(sizeof(*pvt->addrmatch_dev), GFP_KERNEL);
        if (!pvt->addrmatch_dev)
                return rc;

        pvt->addrmatch_dev->type = &addrmatch_type;
        pvt->addrmatch_dev->bus = mci->dev.bus;
        device_initialize(pvt->addrmatch_dev);
        pvt->addrmatch_dev->parent = &mci->dev;
        dev_set_name(pvt->addrmatch_dev, "inject_addrmatch");
        dev_set_drvdata(pvt->addrmatch_dev, mci);

        edac_dbg(1, "creating %s\n", dev_name(pvt->addrmatch_dev));

        rc = device_add(pvt->addrmatch_dev);
        if (rc < 0)
                return rc;

        if (!pvt->is_registered) {
                pvt->chancounts_dev = kzalloc(sizeof(*pvt->chancounts_dev),
                                              GFP_KERNEL);
                if (!pvt->chancounts_dev) {
                        put_device(pvt->addrmatch_dev);
                        device_del(pvt->addrmatch_dev);
                        return rc;
                }

                pvt->chancounts_dev->type = &all_channel_counts_type;
                pvt->chancounts_dev->bus = mci->dev.bus;
                device_initialize(pvt->chancounts_dev);
                pvt->chancounts_dev->parent = &mci->dev;
                dev_set_name(pvt->chancounts_dev, "all_channel_counts");
                dev_set_drvdata(pvt->chancounts_dev, mci);

                edac_dbg(1, "creating %s\n", dev_name(pvt->chancounts_dev));

                rc = device_add(pvt->chancounts_dev);
                if (rc < 0)
                        return rc;
        }
        return 0;
}

static void i7core_delete_sysfs_devices(struct mem_ctl_info *mci)
{
        struct i7core_pvt *pvt = mci->pvt_info;

        edac_dbg(1, "\n");

        device_remove_file(&mci->dev, &dev_attr_inject_section);
        device_remove_file(&mci->dev, &dev_attr_inject_type);
        device_remove_file(&mci->dev, &dev_attr_inject_eccmask);
        device_remove_file(&mci->dev, &dev_attr_inject_enable);

        if (!pvt->is_registered) {
                put_device(pvt->chancounts_dev);
                device_del(pvt->chancounts_dev);
        }
        put_device(pvt->addrmatch_dev);
        device_del(pvt->addrmatch_dev);
}

/****************************************************************************
        Device initialization routines: put/get, init/exit
 ****************************************************************************/

/*
 *      i7core_put_all_devices  'put' all the devices that we have
 *                              reserved via 'get'
 */
static void i7core_put_devices(struct i7core_dev *i7core_dev)
{
        int i;

        edac_dbg(0, "\n");
        for (i = 0; i < i7core_dev->n_devs; i++) {
                struct pci_dev *pdev = i7core_dev->pdev[i];
                if (!pdev)
                        continue;
                edac_dbg(0, "Removing dev %02x:%02x.%d\n",
                         pdev->bus->number,
                         PCI_SLOT(pdev->devfn), PCI_FUNC(pdev->devfn));
                pci_dev_put(pdev);
        }
}

static void i7core_put_all_devices(void)
{
        struct i7core_dev *i7core_dev, *tmp;

        list_for_each_entry_safe(i7core_dev, tmp, &i7core_edac_list, list) {
                i7core_put_devices(i7core_dev);
                free_i7core_dev(i7core_dev);
        }
}

static void __init i7core_xeon_pci_fixup(const struct pci_id_table *table)
{
        struct pci_dev *pdev = NULL;
        int i;

        /*
         * On Xeon 55xx, the Intel Quick Path Arch Generic Non-core pci buses
         * aren't announced by acpi. So, we need to use a legacy scan probing
         * to detect them
         */
        while (table && table->descr) {
                pdev = pci_get_device(PCI_VENDOR_ID_INTEL, table->descr[0].dev_id, NULL);
                if (unlikely(!pdev)) {
                        for (i = 0; i < MAX_SOCKET_BUSES; i++)
                                pcibios_scan_specific_bus(255-i);
                }
                pci_dev_put(pdev);
                table++;
        }
}

static unsigned i7core_pci_lastbus(void)
{
        int last_bus = 0, bus;
        struct pci_bus *b = NULL;

        while ((b = pci_find_next_bus(b)) != NULL) {
                bus = b->number;
                edac_dbg(0, "Found bus %d\n", bus);
                if (bus > last_bus)
                        last_bus = bus;
        }

        edac_dbg(0, "Last bus %d\n", last_bus);

        return last_bus;
}

/*
 *      i7core_get_all_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 i7core_get_onedevice(struct pci_dev **prev,
                                const struct pci_id_table *table,
                                const unsigned devno,
                                const unsigned last_bus)
{
        struct i7core_dev *i7core_dev;
        const struct pci_id_descr *dev_descr = &table->descr[devno];

        struct pci_dev *pdev = NULL;
        u8 bus = 0;
        u8 socket = 0;

        pdev = pci_get_device(PCI_VENDOR_ID_INTEL,
                              dev_descr->dev_id, *prev);

        /*
         * On Xeon 55xx, the Intel QuickPath Arch Generic Non-core regs
         * is at addr 8086:2c40, instead of 8086:2c41. So, we need
         * to probe for the alternate address in case of failure
         */
        if (dev_descr->dev_id == PCI_DEVICE_ID_INTEL_I7_NONCORE && !pdev) {
                pci_dev_get(*prev);     /* pci_get_device will put it */
                pdev = pci_get_device(PCI_VENDOR_ID_INTEL,
                                      PCI_DEVICE_ID_INTEL_I7_NONCORE_ALT, *prev);
        }

        if (dev_descr->dev_id == PCI_DEVICE_ID_INTEL_LYNNFIELD_NONCORE &&
            !pdev) {
                pci_dev_get(*prev);     /* pci_get_device will put it */
                pdev = pci_get_device(PCI_VENDOR_ID_INTEL,
                                      PCI_DEVICE_ID_INTEL_LYNNFIELD_NONCORE_ALT,
                                      *prev);
        }

        if (!pdev) {
                if (*prev) {
                        *prev = pdev;
                        return 0;
                }

                if (dev_descr->optional)
                        return 0;

                if (devno == 0)
                        return -ENODEV;

                i7core_printk(KERN_INFO,
                        "Device not found: dev %02x.%d PCI ID %04x:%04x\n",
                        dev_descr->dev, dev_descr->func,
                        PCI_VENDOR_ID_INTEL, dev_descr->dev_id);

                /* End of list, leave */
                return -ENODEV;
        }
        bus = pdev->bus->number;

        socket = last_bus - bus;

        i7core_dev = get_i7core_dev(socket);
        if (!i7core_dev) {
                i7core_dev = alloc_i7core_dev(socket, table);
                if (!i7core_dev) {
                        pci_dev_put(pdev);
                        return -ENOMEM;
                }
        }

        if (i7core_dev->pdev[devno]) {
                i7core_printk(KERN_ERR,
                        "Duplicated device for "
                        "dev %02x:%02x.%d PCI ID %04x:%04x\n",
                        bus, dev_descr->dev, dev_descr->func,
                        PCI_VENDOR_ID_INTEL, dev_descr->dev_id);
                pci_dev_put(pdev);
                return -ENODEV;
        }

        i7core_dev->pdev[devno] = pdev;

        /* Sanity check */
        if (unlikely(PCI_SLOT(pdev->devfn) != dev_descr->dev ||
                        PCI_FUNC(pdev->devfn) != dev_descr->func)) {
                i7core_printk(KERN_ERR,
                        "Device PCI ID %04x:%04x "
                        "has dev %02x:%02x.%d instead of dev %02x:%02x.%d\n",
                        PCI_VENDOR_ID_INTEL, dev_descr->dev_id,
                        bus, PCI_SLOT(pdev->devfn), PCI_FUNC(pdev->devfn),
                        bus, dev_descr->dev, dev_descr->func);
                return -ENODEV;
        }

        /* Be sure that the device is enabled */
        if (unlikely(pci_enable_device(pdev) < 0)) {
                i7core_printk(KERN_ERR,
                        "Couldn't enable "
                        "dev %02x:%02x.%d PCI ID %04x:%04x\n",
                        bus, dev_descr->dev, dev_descr->func,
                        PCI_VENDOR_ID_INTEL, dev_descr->dev_id);
                return -ENODEV;
        }

        edac_dbg(0, "Detected socket %d dev %02x:%02x.%d PCI ID %04x:%04x\n",
                 socket, bus, dev_descr->dev,
                 dev_descr->func,
                 PCI_VENDOR_ID_INTEL, dev_descr->dev_id);

        /*
         * As stated on drivers/pci/search.c, the reference count for
         * @from is always decremented if it is not %NULL. So, as we need
         * to get all devices up to null, we need to do a get for the device
         */
        pci_dev_get(pdev);

        *prev = pdev;

        return 0;
}

static int i7core_get_all_devices(void)
{
        int i, rc, last_bus;
        struct pci_dev *pdev = NULL;
        const struct pci_id_table *table = pci_dev_table;

        last_bus = i7core_pci_lastbus();

        while (table && table->descr) {
                for (i = 0; i < table->n_devs; i++) {
                        pdev = NULL;
                        do {
                                rc = i7core_get_onedevice(&pdev, table, i,
                                                          last_bus);
                                if (rc < 0) {
                                        if (i == 0) {
                                                i = table->n_devs;
                                                break;
                                        }
                                        i7core_put_all_devices();
                                        return -ENODEV;
                                }
                        } while (pdev);
                }
                table++;
        }

        return 0;
}

static int mci_bind_devs(struct mem_ctl_info *mci,
                         struct i7core_dev *i7core_dev)
{
        struct i7core_pvt *pvt = mci->pvt_info;
        struct pci_dev *pdev;
        int i, func, slot;
        char *family;

        pvt->is_registered = false;
        pvt->enable_scrub  = false;
        for (i = 0; i < i7core_dev->n_devs; i++) {
                pdev = i7core_dev->pdev[i];
                if (!pdev)
                        continue;

                func = PCI_FUNC(pdev->devfn);
                slot = PCI_SLOT(pdev->devfn);
                if (slot == 3) {
                        if (unlikely(func > MAX_MCR_FUNC))
                                goto error;
                        pvt->pci_mcr[func] = pdev;
                } else if (likely(slot >= 4 && slot < 4 + NUM_CHANS)) {
                        if (unlikely(func > MAX_CHAN_FUNC))
                                goto error;
                        pvt->pci_ch[slot - 4][func] = pdev;
                } else if (!slot && !func) {
                        pvt->pci_noncore = pdev;

                        /* Detect the processor family */
                        switch (pdev->device) {
                        case PCI_DEVICE_ID_INTEL_I7_NONCORE:
                                family = "Xeon 35xx/ i7core";
                                pvt->enable_scrub = false;
                                break;
                        case PCI_DEVICE_ID_INTEL_LYNNFIELD_NONCORE_ALT:
                                family = "i7-800/i5-700";
                                pvt->enable_scrub = false;
                                break;
                        case PCI_DEVICE_ID_INTEL_LYNNFIELD_NONCORE:
                                family = "Xeon 34xx";
                                pvt->enable_scrub = false;
                                break;
                        case PCI_DEVICE_ID_INTEL_I7_NONCORE_ALT:
                                family = "Xeon 55xx";
                                pvt->enable_scrub = true;
                                break;
                        case PCI_DEVICE_ID_INTEL_LYNNFIELD_NONCORE_REV2:
                                family = "Xeon 56xx / i7-900";
                                pvt->enable_scrub = true;
                                break;
                        default:
                                family = "unknown";
                                pvt->enable_scrub = false;
                        }
                        edac_dbg(0, "Detected a processor type %s\n", family);
                } else
                        goto error;

                edac_dbg(0, "Associated fn %d.%d, dev = %p, socket %d\n",
                         PCI_SLOT(pdev->devfn), PCI_FUNC(pdev->devfn),
                         pdev, i7core_dev->socket);

                if (PCI_SLOT(pdev->devfn) == 3 &&
                        PCI_FUNC(pdev->devfn) == 2)
                        pvt->is_registered = true;
        }

        return 0;

error:
        i7core_printk(KERN_ERR, "Device %d, function %d "
                      "is out of the expected range\n",
                      slot, func);
        return -EINVAL;
}

/****************************************************************************
                        Error check routines
 ****************************************************************************/

static void i7core_rdimm_update_ce_count(struct mem_ctl_info *mci,
                                         const int chan,
                                         const int new0,
                                         const int new1,
                                         const int new2)
{
        struct i7core_pvt *pvt = mci->pvt_info;
        int add0 = 0, add1 = 0, add2 = 0;
        /* Updates CE counters if it is not the first time here */
        if (pvt->ce_count_available) {
                /* Updates CE counters */

                add2 = new2 - pvt->rdimm_last_ce_count[chan][2];
                add1 = new1 - pvt->rdimm_last_ce_count[chan][1];
                add0 = new0 - pvt->rdimm_last_ce_count[chan][0];

                if (add2 < 0)
                        add2 += 0x7fff;
                pvt->rdimm_ce_count[chan][2] += add2;

                if (add1 < 0)
                        add1 += 0x7fff;
                pvt->rdimm_ce_count[chan][1] += add1;

                if (add0 < 0)
                        add0 += 0x7fff;
                pvt->rdimm_ce_count[chan][0] += add0;
        } else
                pvt->ce_count_available = 1;

        /* Store the new values */
        pvt->rdimm_last_ce_count[chan][2] = new2;
        pvt->rdimm_last_ce_count[chan][1] = new1;
        pvt->rdimm_last_ce_count[chan][0] = new0;

        /*updated the edac core */
        if (add0 != 0)
                edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci, add0,
                                     0, 0, 0,
                                     chan, 0, -1, "error", "");
        if (add1 != 0)
                edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci, add1,
                                     0, 0, 0,
                                     chan, 1, -1, "error", "");
        if (add2 != 0)
                edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci, add2,
                                     0, 0, 0,
                                     chan, 2, -1, "error", "");
}

static void i7core_rdimm_check_mc_ecc_err(struct mem_ctl_info *mci)
{
        struct i7core_pvt *pvt = mci->pvt_info;
        u32 rcv[3][2];
        int i, new0, new1, new2;

        /*Read DEV 3: FUN 2:  MC_COR_ECC_CNT regs directly*/
        pci_read_config_dword(pvt->pci_mcr[2], MC_COR_ECC_CNT_0,
                                                                &rcv[0][0]);
        pci_read_config_dword(pvt->pci_mcr[2], MC_COR_ECC_CNT_1,
                                                                &rcv[0][1]);
        pci_read_config_dword(pvt->pci_mcr[2], MC_COR_ECC_CNT_2,
                                                                &rcv[1][0]);
        pci_read_config_dword(pvt->pci_mcr[2], MC_COR_ECC_CNT_3,
                                                                &rcv[1][1]);
        pci_read_config_dword(pvt->pci_mcr[2], MC_COR_ECC_CNT_4,
                                                                &rcv[2][0]);
        pci_read_config_dword(pvt->pci_mcr[2], MC_COR_ECC_CNT_5,
                                                                &rcv[2][1]);
        for (i = 0 ; i < 3; i++) {
                edac_dbg(3, "MC_COR_ECC_CNT%d = 0x%x; MC_COR_ECC_CNT%d = 0x%x\n",
                         (i * 2), rcv[i][0], (i * 2) + 1, rcv[i][1]);
                /*if the channel has 3 dimms*/
                if (pvt->channel[i].dimms > 2) {
                        new0 = DIMM_BOT_COR_ERR(rcv[i][0]);
                        new1 = DIMM_TOP_COR_ERR(rcv[i][0]);
                        new2 = DIMM_BOT_COR_ERR(rcv[i][1]);
                } else {
                        new0 = DIMM_TOP_COR_ERR(rcv[i][0]) +
                                        DIMM_BOT_COR_ERR(rcv[i][0]);
                        new1 = DIMM_TOP_COR_ERR(rcv[i][1]) +
                                        DIMM_BOT_COR_ERR(rcv[i][1]);
                        new2 = 0;
                }

                i7core_rdimm_update_ce_count(mci, i, new0, new1, new2);
        }
}

/* This function is based on the device 3 function 4 registers as described on:
 * Intel Xeon Processor 5500 Series Datasheet Volume 2
 *      http://www.intel.com/Assets/PDF/datasheet/321322.pdf
 * also available at:
 *      http://www.arrownac.com/manufacturers/intel/s/nehalem/5500-datasheet-v2.pdf
 */
static void i7core_udimm_check_mc_ecc_err(struct mem_ctl_info *mci)
{
        struct i7core_pvt *pvt = mci->pvt_info;
        u32 rcv1, rcv0;
        int new0, new1, new2;

        if (!pvt->pci_mcr[4]) {
                edac_dbg(0, "MCR registers not found\n");
                return;
        }

        /* Corrected test errors */
        pci_read_config_dword(pvt->pci_mcr[4], MC_TEST_ERR_RCV1, &rcv1);
        pci_read_config_dword(pvt->pci_mcr[4], MC_TEST_ERR_RCV0, &rcv0);

        /* Store the new values */
        new2 = DIMM2_COR_ERR(rcv1);
        new1 = DIMM1_COR_ERR(rcv0);
        new0 = DIMM0_COR_ERR(rcv0);

        /* Updates CE counters if it is not the first time here */
        if (pvt->ce_count_available) {
                /* Updates CE counters */
                int add0, add1, add2;

                add2 = new2 - pvt->udimm_last_ce_count[2];
                add1 = new1 - pvt->udimm_last_ce_count[1];
                add0 = new0 - pvt->udimm_last_ce_count[0];

                if (add2 < 0)
                        add2 += 0x7fff;
                pvt->udimm_ce_count[2] += add2;

                if (add1 < 0)
                        add1 += 0x7fff;
                pvt->udimm_ce_count[1] += add1;

                if (add0 < 0)
                        add0 += 0x7fff;
                pvt->udimm_ce_count[0] += add0;

                if (add0 | add1 | add2)
                        i7core_printk(KERN_ERR, "New Corrected error(s): "
                                      "dimm0: +%d, dimm1: +%d, dimm2 +%d\n",
                                      add0, add1, add2);
        } else
                pvt->ce_count_available = 1;

        /* Store the new values */
        pvt->udimm_last_ce_count[2] = new2;
        pvt->udimm_last_ce_count[1] = new1;
        pvt->udimm_last_ce_count[0] = new0;
}

/*
 * According with tables E-11 and E-12 of chapter E.3.3 of Intel 64 and IA-32
 * Architectures Software Developer’s Manual Volume 3B.
 * Nehalem are defined as family 0x06, model 0x1a
 *
 * The MCA registers used here are the following ones:
 *     struct mce field MCA Register
 *     m->status        MSR_IA32_MC8_STATUS
 *     m->addr          MSR_IA32_MC8_ADDR
 *     m->misc          MSR_IA32_MC8_MISC
 * In the case of Nehalem, the error information is masked at .status and .misc
 * fields
 */
static void i7core_mce_output_error(struct mem_ctl_info *mci,
                                    const struct mce *m)
{
        struct i7core_pvt *pvt = mci->pvt_info;
        char *optype, *err;
        enum hw_event_mc_err_type tp_event;
        unsigned long error = m->status & 0x1ff0000l;
        bool uncorrected_error = m->mcgstatus & 1ll << 61;
        bool ripv = m->mcgstatus & 1;
        u32 optypenum = (m->status >> 4) & 0x07;
        u32 core_err_cnt = (m->status >> 38) & 0x7fff;
        u32 dimm = (m->misc >> 16) & 0x3;
        u32 channel = (m->misc >> 18) & 0x3;
        u32 syndrome = m->misc >> 32;
        u32 errnum = find_first_bit(&error, 32);

        if (uncorrected_error) {
                if (ripv)
                        tp_event = HW_EVENT_ERR_FATAL;
                else
                        tp_event = HW_EVENT_ERR_UNCORRECTED;
        } else {
                tp_event = HW_EVENT_ERR_CORRECTED;
        }

        switch (optypenum) {
        case 0:
                optype = "generic undef request";
                break;
        case 1:
                optype = "read error";
                break;
        case 2:
                optype = "write error";
                break;
        case 3:
                optype = "addr/cmd error";
                break;
        case 4:
                optype = "scrubbing error";
                break;
        default:
                optype = "reserved";
                break;
        }

        switch (errnum) {
        case 16:
                err = "read ECC error";
                break;
        case 17:
                err = "RAS ECC error";
                break;
        case 18:
                err = "write parity error";
                break;
        case 19:
                err = "redundacy loss";
                break;
        case 20:
                err = "reserved";
                break;
        case 21:
                err = "memory range error";
                break;
        case 22:
                err = "RTID out of range";
                break;
        case 23:
                err = "address parity error";
                break;
        case 24:
                err = "byte enable parity error";
                break;
        default:
                err = "unknown";
        }

        /*
         * Call the helper to output message
         * FIXME: what to do if core_err_cnt > 1? Currently, it generates
         * only one event
         */
        if (uncorrected_error || !pvt->is_registered)
                edac_mc_handle_error(tp_event, mci, core_err_cnt,
                                     m->addr >> PAGE_SHIFT,
                                     m->addr & ~PAGE_MASK,
                                     syndrome,
                                     channel, dimm, -1,
                                     err, optype);
}

/*
 *      i7core_check_error      Retrieve and process errors reported by the
 *                              hardware. Called by the Core module.
 */
static void i7core_check_error(struct mem_ctl_info *mci)
{
        struct i7core_pvt *pvt = mci->pvt_info;
        int i;
        unsigned count = 0;
        struct mce *m;

        /*
         * MCE first step: Copy all mce errors into a temporary buffer
         * We use a double buffering here, to reduce the risk of
         * losing an error.
         */
        smp_rmb();
        count = (pvt->mce_out + MCE_LOG_LEN - pvt->mce_in)
                % MCE_LOG_LEN;
        if (!count)
                goto check_ce_error;

        m = pvt->mce_outentry;
        if (pvt->mce_in + count > MCE_LOG_LEN) {
                unsigned l = MCE_LOG_LEN - pvt->mce_in;

                memcpy(m, &pvt->mce_entry[pvt->mce_in], sizeof(*m) * l);
                smp_wmb();
                pvt->mce_in = 0;
                count -= l;
                m += l;
        }
        memcpy(m, &pvt->mce_entry[pvt->mce_in], sizeof(*m) * count);
        smp_wmb();
        pvt->mce_in += count;

        smp_rmb();
        if (pvt->mce_overrun) {
                i7core_printk(KERN_ERR, "Lost %d memory errors\n",
                              pvt->mce_overrun);
                smp_wmb();
                pvt->mce_overrun = 0;
        }

        /*
         * MCE second step: parse errors and display
         */
        for (i = 0; i < count; i++)
                i7core_mce_output_error(mci, &pvt->mce_outentry[i]);

        /*
         * Now, let's increment CE error counts
         */
check_ce_error:
        if (!pvt->is_registered)
                i7core_udimm_check_mc_ecc_err(mci);
        else
                i7core_rdimm_check_mc_ecc_err(mci);
}

/*
 * i7core_mce_check_error       Replicates mcelog routine to get errors
 *                              This routine simply queues mcelog errors, and
 *                              return. The error itself should be handled later
 *                              by i7core_check_error.
 * WARNING: As this routine should be called at NMI time, extra care should
 * be taken to avoid deadlocks, and to be as fast as possible.
 */
static int i7core_mce_check_error(struct notifier_block *nb, unsigned long val,
                                  void *data)
{
        struct mce *mce = (struct mce *)data;
        struct i7core_dev *i7_dev;
        struct mem_ctl_info *mci;
        struct i7core_pvt *pvt;

        i7_dev = get_i7core_dev(mce->socketid);
        if (!i7_dev)
                return NOTIFY_BAD;

        mci = i7_dev->mci;
        pvt = mci->pvt_info;

        /*
         * Just let mcelog handle it if the error is
         * outside the memory controller
         */
        if (((mce->status & 0xffff) >> 7) != 1)
                return NOTIFY_DONE;

        /* Bank 8 registers are the only ones that we know how to handle */
        if (mce->bank != 8)
                return NOTIFY_DONE;

        smp_rmb();
        if ((pvt->mce_out + 1) % MCE_LOG_LEN == pvt->mce_in) {
                smp_wmb();
                pvt->mce_overrun++;
                return NOTIFY_DONE;
        }

        /* Copy memory error at the ringbuffer */
        memcpy(&pvt->mce_entry[pvt->mce_out], mce, sizeof(*mce));
        smp_wmb();
        pvt->mce_out = (pvt->mce_out + 1) % MCE_LOG_LEN;

        /* Handle fatal errors immediately */
        if (mce->mcgstatus & 1)
                i7core_check_error(mci);

        /* Advise mcelog that the errors were handled */
        return NOTIFY_STOP;
}

static struct notifier_block i7_mce_dec = {
        .notifier_call  = i7core_mce_check_error,
};

struct memdev_dmi_entry {
        u8 type;
        u8 length;
        u16 handle;
        u16 phys_mem_array_handle;
        u16 mem_err_info_handle;
        u16 total_width;
        u16 data_width;
        u16 size;
        u8 form;
        u8 device_set;
        u8 device_locator;
        u8 bank_locator;
        u8 memory_type;
        u16 type_detail;
        u16 speed;
        u8 manufacturer;
        u8 serial_number;
        u8 asset_tag;
        u8 part_number;
        u8 attributes;
        u32 extended_size;
        u16 conf_mem_clk_speed;
} __attribute__((__packed__));


/*
 * Decode the DRAM Clock Frequency, be paranoid, make sure that all
 * memory devices show the same speed, and if they don't then consider
 * all speeds to be invalid.
 */
static void decode_dclk(const struct dmi_header *dh, void *_dclk_freq)
{
        int *dclk_freq = _dclk_freq;
        u16 dmi_mem_clk_speed;

        if (*dclk_freq == -1)
                return;

        if (dh->type == DMI_ENTRY_MEM_DEVICE) {
                struct memdev_dmi_entry *memdev_dmi_entry =
                        (struct memdev_dmi_entry *)dh;
                unsigned long conf_mem_clk_speed_offset =
                        (unsigned long)&memdev_dmi_entry->conf_mem_clk_speed -
                        (unsigned long)&memdev_dmi_entry->type;
                unsigned long speed_offset =
                        (unsigned long)&memdev_dmi_entry->speed -
                        (unsigned long)&memdev_dmi_entry->type;

                /* Check that a DIMM is present */
                if (memdev_dmi_entry->size == 0)
                        return;

                /*
                 * Pick the configured speed if it's available, otherwise
                 * pick the DIMM speed, or we don't have a speed.
                 */
                if (memdev_dmi_entry->length > conf_mem_clk_speed_offset) {
                        dmi_mem_clk_speed =
                                memdev_dmi_entry->conf_mem_clk_speed;
                } else if (memdev_dmi_entry->length > speed_offset) {
                        dmi_mem_clk_speed = memdev_dmi_entry->speed;
                } else {
                        *dclk_freq = -1;
                        return;
                }

                if (*dclk_freq == 0) {
                        /* First pass, speed was 0 */
                        if (dmi_mem_clk_speed > 0) {
                                /* Set speed if a valid speed is read */
                                *dclk_freq = dmi_mem_clk_speed;
                        } else {
                                /* Otherwise we don't have a valid speed */
                                *dclk_freq = -1;
                        }
                } else if (*dclk_freq > 0 &&
                           *dclk_freq != dmi_mem_clk_speed) {
                        /*
                         * If we have a speed, check that all DIMMS are the same
                         * speed, otherwise set the speed as invalid.
                         */
                        *dclk_freq = -1;
                }

        }
}

/*
 * The default DCLK frequency is used as a fallback if we
 * fail to find anything reliable in the DMI. The value
 * is taken straight from the datasheet.
 */
#define DEFAULT_DCLK_FREQ 800

static int get_dclk_freq(void)
{
        int dclk_freq = 0;

        dmi_walk(decode_dclk, (void *)&dclk_freq);

        if (dclk_freq < 1)
                return DEFAULT_DCLK_FREQ;

        return dclk_freq;
}

/*
 * set_sdram_scrub_rate         This routine sets byte/sec bandwidth scrub rate
 *                              to hardware according to SCRUBINTERVAL formula
 *                              found in datasheet.
 */
static int set_sdram_scrub_rate(struct mem_ctl_info *mci, u32 new_bw)
{
        struct i7core_pvt *pvt = mci->pvt_info;
        struct pci_dev *pdev;
        u32 dw_scrub;
        u32 dw_ssr;

        /* Get data from the MC register, function 2 */
        pdev = pvt->pci_mcr[2];
        if (!pdev)
                return -ENODEV;

        pci_read_config_dword(pdev, MC_SCRUB_CONTROL, &dw_scrub);

        if (new_bw == 0) {
                /* Prepare to disable petrol scrub */
                dw_scrub &= ~STARTSCRUB;
                /* Stop the patrol scrub engine */
                write_and_test(pdev, MC_SCRUB_CONTROL,
                               dw_scrub & ~SCRUBINTERVAL_MASK);

                /* Get current status of scrub rate and set bit to disable */
                pci_read_config_dword(pdev, MC_SSRCONTROL, &dw_ssr);
                dw_ssr &= ~SSR_MODE_MASK;
                dw_ssr |= SSR_MODE_DISABLE;
        } else {
                const int cache_line_size = 64;
                const u32 freq_dclk_mhz = pvt->dclk_freq;
                unsigned long long scrub_interval;
                /*
                 * Translate the desired scrub rate to a register value and
                 * program the corresponding register value.
                 */
                scrub_interval = (unsigned long long)freq_dclk_mhz *
                        cache_line_size * 1000000;
                do_div(scrub_interval, new_bw);

                if (!scrub_interval || scrub_interval > SCRUBINTERVAL_MASK)
                        return -EINVAL;

                dw_scrub = SCRUBINTERVAL_MASK & scrub_interval;

                /* Start the patrol scrub engine */
                pci_write_config_dword(pdev, MC_SCRUB_CONTROL,
                                       STARTSCRUB | dw_scrub);

                /* Get current status of scrub rate and set bit to enable */
                pci_read_config_dword(pdev, MC_SSRCONTROL, &dw_ssr);
                dw_ssr &= ~SSR_MODE_MASK;
                dw_ssr |= SSR_MODE_ENABLE;
        }
        /* Disable or enable scrubbing */
        pci_write_config_dword(pdev, MC_SSRCONTROL, dw_ssr);

        return new_bw;
}

/*
 * get_sdram_scrub_rate         This routine convert current scrub rate value
 *                              into byte/sec bandwidth according to
 *                              SCRUBINTERVAL formula found in datasheet.
 */
static int get_sdram_scrub_rate(struct mem_ctl_info *mci)
{
        struct i7core_pvt *pvt = mci->pvt_info;
        struct pci_dev *pdev;
        const u32 cache_line_size = 64;
        const u32 freq_dclk_mhz = pvt->dclk_freq;
        unsigned long long scrub_rate;
        u32 scrubval;

        /* Get data from the MC register, function 2 */
        pdev = pvt->pci_mcr[2];
        if (!pdev)
                return -ENODEV;

        /* Get current scrub control data */
        pci_read_config_dword(pdev, MC_SCRUB_CONTROL, &scrubval);

        /* Mask highest 8-bits to 0 */
        scrubval &=  SCRUBINTERVAL_MASK;
        if (!scrubval)
                return 0;

        /* Calculate scrub rate value into byte/sec bandwidth */
        scrub_rate =  (unsigned long long)freq_dclk_mhz *
                1000000 * cache_line_size;
        do_div(scrub_rate, scrubval);
        return (int)scrub_rate;
}

static void enable_sdram_scrub_setting(struct mem_ctl_info *mci)
{
        struct i7core_pvt *pvt = mci->pvt_info;
        u32 pci_lock;

        /* Unlock writes to pci registers */
        pci_read_config_dword(pvt->pci_noncore, MC_CFG_CONTROL, &pci_lock);
        pci_lock &= ~0x3;
        pci_write_config_dword(pvt->pci_noncore, MC_CFG_CONTROL,
                               pci_lock | MC_CFG_UNLOCK);

        mci->set_sdram_scrub_rate = set_sdram_scrub_rate;
        mci->get_sdram_scrub_rate = get_sdram_scrub_rate;
}

static void disable_sdram_scrub_setting(struct mem_ctl_info *mci)
{
        struct i7core_pvt *pvt = mci->pvt_info;
        u32 pci_lock;

        /* Lock writes to pci registers */
        pci_read_config_dword(pvt->pci_noncore, MC_CFG_CONTROL, &pci_lock);
        pci_lock &= ~0x3;
        pci_write_config_dword(pvt->pci_noncore, MC_CFG_CONTROL,
                               pci_lock | MC_CFG_LOCK);
}

static void i7core_pci_ctl_create(struct i7core_pvt *pvt)
{
        pvt->i7core_pci = edac_pci_create_generic_ctl(
                                                &pvt->i7core_dev->pdev[0]->dev,
                                                EDAC_MOD_STR);
        if (unlikely(!pvt->i7core_pci))
                i7core_printk(KERN_WARNING,
                              "Unable to setup PCI error report via EDAC\n");
}

static void i7core_pci_ctl_release(struct i7core_pvt *pvt)
{
        if (likely(pvt->i7core_pci))
                edac_pci_release_generic_ctl(pvt->i7core_pci);
        else
                i7core_printk(KERN_ERR,
                                "Couldn't find mem_ctl_info for socket %d\n",
                                pvt->i7core_dev->socket);
        pvt->i7core_pci = NULL;
}

static void i7core_unregister_mci(struct i7core_dev *i7core_dev)
{
        struct mem_ctl_info *mci = i7core_dev->mci;
        struct i7core_pvt *pvt;

        if (unlikely(!mci || !mci->pvt_info)) {
                edac_dbg(0, "MC: dev = %p\n", &i7core_dev->pdev[0]->dev);

                i7core_printk(KERN_ERR, "Couldn't find mci handler\n");
                return;
        }

        pvt = mci->pvt_info;

        edac_dbg(0, "MC: mci = %p, dev = %p\n", mci, &i7core_dev->pdev[0]->dev);

        /* Disable scrubrate setting */
        if (pvt->enable_scrub)
                disable_sdram_scrub_setting(mci);

        /* Disable EDAC polling */
        i7core_pci_ctl_release(pvt);

        /* Remove MC sysfs nodes */
        i7core_delete_sysfs_devices(mci);
        edac_mc_del_mc(mci->pdev);

        edac_dbg(1, "%s: free mci struct\n", mci->ctl_name);
        kfree(mci->ctl_name);
        edac_mc_free(mci);
        i7core_dev->mci = NULL;
}

static int i7core_register_mci(struct i7core_dev *i7core_dev)
{
        struct mem_ctl_info *mci;
        struct i7core_pvt *pvt;
        int rc;
        struct edac_mc_layer layers[2];

        /* allocate a new MC control structure */

        layers[0].type = EDAC_MC_LAYER_CHANNEL;
        layers[0].size = NUM_CHANS;
        layers[0].is_virt_csrow = false;
        layers[1].type = EDAC_MC_LAYER_SLOT;
        layers[1].size = MAX_DIMMS;
        layers[1].is_virt_csrow = true;
        mci = edac_mc_alloc(i7core_dev->socket, ARRAY_SIZE(layers), layers,
                            sizeof(*pvt));
        if (unlikely(!mci))
                return -ENOMEM;

        edac_dbg(0, "MC: mci = %p, dev = %p\n", mci, &i7core_dev->pdev[0]->dev);

        pvt = mci->pvt_info;
        memset(pvt, 0, sizeof(*pvt));

        /* Associates i7core_dev and mci for future usage */
        pvt->i7core_dev = i7core_dev;
        i7core_dev->mci = mci;

        /*
         * FIXME: how to handle RDDR3 at MCI level? It is possible to have
         * Mixed RDDR3/UDDR3 with Nehalem, provided that they are on different
         * memory channels
         */
        mci->mtype_cap = MEM_FLAG_DDR3;
        mci->edac_ctl_cap = EDAC_FLAG_NONE;
        mci->edac_cap = EDAC_FLAG_NONE;
        mci->mod_name = "i7core_edac.c";
        mci->mod_ver = I7CORE_REVISION;
        mci->ctl_name = kasprintf(GFP_KERNEL, "i7 core #%d",
                                  i7core_dev->socket);
        mci->dev_name = pci_name(i7core_dev->pdev[0]);
        mci->ctl_page_to_phys = NULL;

        /* Store pci devices at mci for faster access */
        rc = mci_bind_devs(mci, i7core_dev);
        if (unlikely(rc < 0))
                goto fail0;


        /* Get dimm basic config */
        get_dimm_config(mci);
        /* record ptr to the generic device */
        mci->pdev = &i7core_dev->pdev[0]->dev;
        /* Set the function pointer to an actual operation function */
        mci->edac_check = i7core_check_error;

        /* Enable scrubrate setting */
        if (pvt->enable_scrub)
                enable_sdram_scrub_setting(mci);

        /* add this new MC control structure to EDAC's list of MCs */
        if (unlikely(edac_mc_add_mc(mci))) {
                edac_dbg(0, "MC: failed edac_mc_add_mc()\n");
                /* FIXME: perhaps some code should go here that disables error
                 * reporting if we just enabled it
                 */

                rc = -EINVAL;
                goto fail0;
        }
        if (i7core_create_sysfs_devices(mci)) {
                edac_dbg(0, "MC: failed to create sysfs nodes\n");
                edac_mc_del_mc(mci->pdev);
                rc = -EINVAL;
                goto fail0;
        }

        /* Default error mask is any memory */
        pvt->inject.channel = 0;
        pvt->inject.dimm = -1;
        pvt->inject.rank = -1;
        pvt->inject.bank = -1;
        pvt->inject.page = -1;
        pvt->inject.col = -1;

        /* allocating generic PCI control info */
        i7core_pci_ctl_create(pvt);

        /* DCLK for scrub rate setting */
        pvt->dclk_freq = get_dclk_freq();

        return 0;

fail0:
        kfree(mci->ctl_name);
        edac_mc_free(mci);
        i7core_dev->mci = NULL;
        return rc;
}

/*
 *      i7core_probe    Probe for ONE instance of device to see if it is
 *                      present.
 *      return:
 *              0 for FOUND a device
 *              < 0 for error code
 */

static int i7core_probe(struct pci_dev *pdev, const struct pci_device_id *id)
{
        int rc, count = 0;
        struct i7core_dev *i7core_dev;

        /* get the pci devices we want to reserve for our use */
        mutex_lock(&i7core_edac_lock);

        /*
         * All memory controllers are allocated at the first pass.
         */
        if (unlikely(probed >= 1)) {
                mutex_unlock(&i7core_edac_lock);
                return -ENODEV;
        }
        probed++;

        rc = i7core_get_all_devices();
        if (unlikely(rc < 0))
                goto fail0;

        list_for_each_entry(i7core_dev, &i7core_edac_list, list) {
                count++;
                rc = i7core_register_mci(i7core_dev);
                if (unlikely(rc < 0))
                        goto fail1;
        }

        /*
         * Nehalem-EX uses a different memory controller. However, as the
         * memory controller is not visible on some Nehalem/Nehalem-EP, we
         * need to indirectly probe via a X58 PCI device. The same devices
         * are found on (some) Nehalem-EX. So, on those machines, the
         * probe routine needs to return -ENODEV, as the actual Memory
         * Controller registers won't be detected.
         */
        if (!count) {
                rc = -ENODEV;
                goto fail1;
        }

        i7core_printk(KERN_INFO,
                      "Driver loaded, %d memory controller(s) found.\n",
                      count);

        mutex_unlock(&i7core_edac_lock);
        return 0;

fail1:
        list_for_each_entry(i7core_dev, &i7core_edac_list, list)
                i7core_unregister_mci(i7core_dev);

        i7core_put_all_devices();
fail0:
        mutex_unlock(&i7core_edac_lock);
        return rc;
}

/*
 *      i7core_remove   destructor for one instance of device
 *
 */
static void i7core_remove(struct pci_dev *pdev)
{
        struct i7core_dev *i7core_dev;

        edac_dbg(0, "\n");

        /*
         * we have a trouble here: pdev value for removal will be wrong, since
         * it will point to the X58 register used to detect that the machine
         * is a Nehalem or upper design. However, due to the way several PCI
         * devices are grouped together to provide MC functionality, we need
         * to use a different method for releasing the devices
         */

        mutex_lock(&i7core_edac_lock);

        if (unlikely(!probed)) {
                mutex_unlock(&i7core_edac_lock);
                return;
        }

        list_for_each_entry(i7core_dev, &i7core_edac_list, list)
                i7core_unregister_mci(i7core_dev);

        /* Release PCI resources */
        i7core_put_all_devices();

        probed--;

        mutex_unlock(&i7core_edac_lock);
}

MODULE_DEVICE_TABLE(pci, i7core_pci_tbl);

/*
 *      i7core_driver   pci_driver structure for this module
 *
 */
static struct pci_driver i7core_driver = {
        .name     = "i7core_edac",
        .probe    = i7core_probe,
        .remove   = i7core_remove,
        .id_table = i7core_pci_tbl,
};

/*
 *      i7core_init             Module entry function
 *                      Try to initialize this module for its devices
 */
static int __init i7core_init(void)
{
        int pci_rc;

        edac_dbg(2, "\n");

        /* Ensure that the OPSTATE is set correctly for POLL or NMI */
        opstate_init();

        if (use_pci_fixup)
                i7core_xeon_pci_fixup(pci_dev_table);

        pci_rc = pci_register_driver(&i7core_driver);

        if (pci_rc >= 0) {
                mce_register_decode_chain(&i7_mce_dec);
                return 0;
        }

        i7core_printk(KERN_ERR, "Failed to register device with error %d.\n",
                      pci_rc);

        return pci_rc;
}

/*
 *      i7core_exit()   Module exit function
 *                      Unregister the driver
 */
static void __exit i7core_exit(void)
{
        edac_dbg(2, "\n");
        pci_unregister_driver(&i7core_driver);
        mce_unregister_decode_chain(&i7_mce_dec);
}

module_init(i7core_init);
module_exit(i7core_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Mauro Carvalho Chehab");
MODULE_AUTHOR("Red Hat Inc. (http://www.redhat.com)");
MODULE_DESCRIPTION("MC Driver for Intel i7 Core memory controllers - "
                   I7CORE_REVISION);

module_param(edac_op_state, int, 0444);
MODULE_PARM_DESC(edac_op_state, "EDAC Error Reporting state: 0=Poll,1=NMI");