/*
 * Intel e752x Memory Controller kernel module
 * (C) 2004 Linux Networx (http://lnxi.com)
 * This file may be distributed under the terms of the
 * GNU General Public License.
 *
 * Implement support for the e7520, E7525, e7320 and i3100 memory controllers.
 *
 * Datasheets:
 *      https://www.intel.in/content/www/in/en/chipsets/e7525-memory-controller-hub-datasheet.html
 *      ftp://download.intel.com/design/intarch/datashts/31345803.pdf
 *
 * Written by Tom Zimmerman
 *
 * Contributors:
 *      Thayne Harbaugh at realmsys.com (?)
 *      Wang Zhenyu at intel.com
 *      Dave Jiang at mvista.com
 *
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/pci_ids.h>
#include <linux/edac.h>
#include "edac_module.h"

#define EDAC_MOD_STR    "e752x_edac"

static int report_non_memory_errors;
static int force_function_unhide;
static int sysbus_parity = -1;

static struct edac_pci_ctl_info *e752x_pci;

#define e752x_printk(level, fmt, arg...) \
        edac_printk(level, "e752x", fmt, ##arg)

#define e752x_mc_printk(mci, level, fmt, arg...) \
        edac_mc_chipset_printk(mci, level, "e752x", fmt, ##arg)

#ifndef PCI_DEVICE_ID_INTEL_7520_0
#define PCI_DEVICE_ID_INTEL_7520_0      0x3590
#endif                          /* PCI_DEVICE_ID_INTEL_7520_0      */

#ifndef PCI_DEVICE_ID_INTEL_7520_1_ERR
#define PCI_DEVICE_ID_INTEL_7520_1_ERR  0x3591
#endif                          /* PCI_DEVICE_ID_INTEL_7520_1_ERR  */

#ifndef PCI_DEVICE_ID_INTEL_7525_0
#define PCI_DEVICE_ID_INTEL_7525_0      0x359E
#endif                          /* PCI_DEVICE_ID_INTEL_7525_0      */

#ifndef PCI_DEVICE_ID_INTEL_7525_1_ERR
#define PCI_DEVICE_ID_INTEL_7525_1_ERR  0x3593
#endif                          /* PCI_DEVICE_ID_INTEL_7525_1_ERR  */

#ifndef PCI_DEVICE_ID_INTEL_7320_0
#define PCI_DEVICE_ID_INTEL_7320_0      0x3592
#endif                          /* PCI_DEVICE_ID_INTEL_7320_0 */

#ifndef PCI_DEVICE_ID_INTEL_7320_1_ERR
#define PCI_DEVICE_ID_INTEL_7320_1_ERR  0x3593
#endif                          /* PCI_DEVICE_ID_INTEL_7320_1_ERR */

#ifndef PCI_DEVICE_ID_INTEL_3100_0
#define PCI_DEVICE_ID_INTEL_3100_0      0x35B0
#endif                          /* PCI_DEVICE_ID_INTEL_3100_0 */

#ifndef PCI_DEVICE_ID_INTEL_3100_1_ERR
#define PCI_DEVICE_ID_INTEL_3100_1_ERR  0x35B1
#endif                          /* PCI_DEVICE_ID_INTEL_3100_1_ERR */

#define E752X_NR_CSROWS         8       /* number of csrows */

/* E752X register addresses - device 0 function 0 */
#define E752X_MCHSCRB           0x52    /* Memory Scrub register (16b) */
                                        /*
                                         * 6:5     Scrub Completion Count
                                         * 3:2     Scrub Rate (i3100 only)
                                         *      01=fast 10=normal
                                         * 1:0     Scrub Mode enable
                                         *      00=off 10=on
                                         */
#define E752X_DRB               0x60    /* DRAM row boundary register (8b) */
#define E752X_DRA               0x70    /* DRAM row attribute register (8b) */
                                        /*
                                         * 31:30   Device width row 7
                                         *      01=x8 10=x4 11=x8 DDR2
                                         * 27:26   Device width row 6
                                         * 23:22   Device width row 5
                                         * 19:20   Device width row 4
                                         * 15:14   Device width row 3
                                         * 11:10   Device width row 2
                                         *  7:6    Device width row 1
                                         *  3:2    Device width row 0
                                         */
#define E752X_DRC               0x7C    /* DRAM controller mode reg (32b) */
                                        /* FIXME:IS THIS RIGHT? */
                                        /*
                                         * 22    Number channels 0=1,1=2
                                         * 19:18 DRB Granularity 32/64MB
                                         */
#define E752X_DRM               0x80    /* Dimm mapping register */
#define E752X_DDRCSR            0x9A    /* DDR control and status reg (16b) */
                                        /*
                                         * 14:12 1 single A, 2 single B, 3 dual
                                         */
#define E752X_TOLM              0xC4    /* DRAM top of low memory reg (16b) */
#define E752X_REMAPBASE         0xC6    /* DRAM remap base address reg (16b) */
#define E752X_REMAPLIMIT        0xC8    /* DRAM remap limit address reg (16b) */
#define E752X_REMAPOFFSET       0xCA    /* DRAM remap limit offset reg (16b) */

/* E752X register addresses - device 0 function 1 */
#define E752X_FERR_GLOBAL       0x40    /* Global first error register (32b) */
#define E752X_NERR_GLOBAL       0x44    /* Global next error register (32b) */
#define E752X_HI_FERR           0x50    /* Hub interface first error reg (8b) */
#define E752X_HI_NERR           0x52    /* Hub interface next error reg (8b) */
#define E752X_HI_ERRMASK        0x54    /* Hub interface error mask reg (8b) */
#define E752X_HI_SMICMD         0x5A    /* Hub interface SMI command reg (8b) */
#define E752X_SYSBUS_FERR       0x60    /* System buss first error reg (16b) */
#define E752X_SYSBUS_NERR       0x62    /* System buss next error reg (16b) */
#define E752X_SYSBUS_ERRMASK    0x64    /* System buss error mask reg (16b) */
#define E752X_SYSBUS_SMICMD     0x6A    /* System buss SMI command reg (16b) */
#define E752X_BUF_FERR          0x70    /* Memory buffer first error reg (8b) */
#define E752X_BUF_NERR          0x72    /* Memory buffer next error reg (8b) */
#define E752X_BUF_ERRMASK       0x74    /* Memory buffer error mask reg (8b) */
#define E752X_BUF_SMICMD        0x7A    /* Memory buffer SMI cmd reg (8b) */
#define E752X_DRAM_FERR         0x80    /* DRAM first error register (16b) */
#define E752X_DRAM_NERR         0x82    /* DRAM next error register (16b) */
#define E752X_DRAM_ERRMASK      0x84    /* DRAM error mask register (8b) */
#define E752X_DRAM_SMICMD       0x8A    /* DRAM SMI command register (8b) */
#define E752X_DRAM_RETR_ADD     0xAC    /* DRAM Retry address register (32b) */
#define E752X_DRAM_SEC1_ADD     0xA0    /* DRAM first correctable memory */
                                        /*     error address register (32b) */
                                        /*
                                         * 31    Reserved
                                         * 30:2  CE address (64 byte block 34:6
                                         * 1     Reserved
                                         * 0     HiLoCS
                                         */
#define E752X_DRAM_SEC2_ADD     0xC8    /* DRAM first correctable memory */
                                        /*     error address register (32b) */
                                        /*
                                         * 31    Reserved
                                         * 30:2  CE address (64 byte block 34:6)
                                         * 1     Reserved
                                         * 0     HiLoCS
                                         */
#define E752X_DRAM_DED_ADD      0xA4    /* DRAM first uncorrectable memory */
                                        /*     error address register (32b) */
                                        /*
                                         * 31    Reserved
                                         * 30:2  CE address (64 byte block 34:6)
                                         * 1     Reserved
                                         * 0     HiLoCS
                                         */
#define E752X_DRAM_SCRB_ADD     0xA8    /* DRAM 1st uncorrectable scrub mem */
                                        /*     error address register (32b) */
                                        /*
                                         * 31    Reserved
                                         * 30:2  CE address (64 byte block 34:6
                                         * 1     Reserved
                                         * 0     HiLoCS
                                         */
#define E752X_DRAM_SEC1_SYNDROME 0xC4   /* DRAM first correctable memory */
                                        /*     error syndrome register (16b) */
#define E752X_DRAM_SEC2_SYNDROME 0xC6   /* DRAM second correctable memory */
                                        /*     error syndrome register (16b) */
#define E752X_DEVPRES1          0xF4    /* Device Present 1 register (8b) */

/* 3100 IMCH specific register addresses - device 0 function 1 */
#define I3100_NSI_FERR          0x48    /* NSI first error reg (32b) */
#define I3100_NSI_NERR          0x4C    /* NSI next error reg (32b) */
#define I3100_NSI_SMICMD        0x54    /* NSI SMI command register (32b) */
#define I3100_NSI_EMASK         0x90    /* NSI error mask register (32b) */

/* ICH5R register addresses - device 30 function 0 */
#define ICH5R_PCI_STAT          0x06    /* PCI status register (16b) */
#define ICH5R_PCI_2ND_STAT      0x1E    /* PCI status secondary reg (16b) */
#define ICH5R_PCI_BRIDGE_CTL    0x3E    /* PCI bridge control register (16b) */

enum e752x_chips {
        E7520 = 0,
        E7525 = 1,
        E7320 = 2,
        I3100 = 3
};

/*
 * Those chips Support single-rank and dual-rank memories only.
 *
 * On e752x chips, the odd rows are present only on dual-rank memories.
 * Dividing the rank by two will provide the dimm#
 *
 * i3100 MC has a different mapping: it supports only 4 ranks.
 *
 * The mapping is (from 1 to n):
 *      slot       single-ranked        double-ranked
 *      dimm #1 -> rank #4              NA
 *      dimm #2 -> rank #3              NA
 *      dimm #3 -> rank #2              Ranks 2 and 3
 *      dimm #4 -> rank $1              Ranks 1 and 4
 *
 * FIXME: The current mapping for i3100 considers that it supports up to 8
 *        ranks/chanel, but datasheet says that the MC supports only 4 ranks.
 */

struct e752x_pvt {
        struct pci_dev *dev_d0f0;
        struct pci_dev *dev_d0f1;
        u32 tolm;
        u32 remapbase;
        u32 remaplimit;
        int mc_symmetric;
        u8 map[8];
        int map_type;
        const struct e752x_dev_info *dev_info;
};

struct e752x_dev_info {
        u16 err_dev;
        u16 ctl_dev;
        const char *ctl_name;
};

struct e752x_error_info {
        u32 ferr_global;
        u32 nerr_global;
        u32 nsi_ferr;   /* 3100 only */
        u32 nsi_nerr;   /* 3100 only */
        u8 hi_ferr;     /* all but 3100 */
        u8 hi_nerr;     /* all but 3100 */
        u16 sysbus_ferr;
        u16 sysbus_nerr;
        u8 buf_ferr;
        u8 buf_nerr;
        u16 dram_ferr;
        u16 dram_nerr;
        u32 dram_sec1_add;
        u32 dram_sec2_add;
        u16 dram_sec1_syndrome;
        u16 dram_sec2_syndrome;
        u32 dram_ded_add;
        u32 dram_scrb_add;
        u32 dram_retr_add;
};

static const struct e752x_dev_info e752x_devs[] = {
        [E7520] = {
                .err_dev = PCI_DEVICE_ID_INTEL_7520_1_ERR,
                .ctl_dev = PCI_DEVICE_ID_INTEL_7520_0,
                .ctl_name = "E7520"},
        [E7525] = {
                .err_dev = PCI_DEVICE_ID_INTEL_7525_1_ERR,
                .ctl_dev = PCI_DEVICE_ID_INTEL_7525_0,
                .ctl_name = "E7525"},
        [E7320] = {
                .err_dev = PCI_DEVICE_ID_INTEL_7320_1_ERR,
                .ctl_dev = PCI_DEVICE_ID_INTEL_7320_0,
                .ctl_name = "E7320"},
        [I3100] = {
                .err_dev = PCI_DEVICE_ID_INTEL_3100_1_ERR,
                .ctl_dev = PCI_DEVICE_ID_INTEL_3100_0,
                .ctl_name = "3100"},
};

/* Valid scrub rates for the e752x/3100 hardware memory scrubber. We
 * map the scrubbing bandwidth to a hardware register value. The 'set'
 * operation finds the 'matching or higher value'.  Note that scrubbing
 * on the e752x can only be enabled/disabled.  The 3100 supports
 * a normal and fast mode.
 */

#define SDRATE_EOT 0xFFFFFFFF

struct scrubrate {
        u32 bandwidth;  /* bandwidth consumed by scrubbing in bytes/sec */
        u16 scrubval;   /* register value for scrub rate */
};

/* Rate below assumes same performance as i3100 using PC3200 DDR2 in
 * normal mode.  e752x bridges don't support choosing normal or fast mode,
 * so the scrubbing bandwidth value isn't all that important - scrubbing is
 * either on or off.
 */
static const struct scrubrate scrubrates_e752x[] = {
        {0,             0x00},  /* Scrubbing Off */
        {500000,        0x02},  /* Scrubbing On */
        {SDRATE_EOT,    0x00}   /* End of Table */
};

/* Fast mode: 2 GByte PC3200 DDR2 scrubbed in 33s = 63161283 bytes/s
 * Normal mode: 125 (32000 / 256) times slower than fast mode.
 */
static const struct scrubrate scrubrates_i3100[] = {
        {0,             0x00},  /* Scrubbing Off */
        {500000,        0x0a},  /* Normal mode - 32k clocks */
        {62500000,      0x06},  /* Fast mode - 256 clocks */
        {SDRATE_EOT,    0x00}   /* End of Table */
};

static unsigned long ctl_page_to_phys(struct mem_ctl_info *mci,
                                unsigned long page)
{
        u32 remap;
        struct e752x_pvt *pvt = (struct e752x_pvt *)mci->pvt_info;

        edac_dbg(3, "\n");

        if (page < pvt->tolm)
                return page;

        if ((page >= 0x100000) && (page < pvt->remapbase))
                return page;

        remap = (page - pvt->tolm) + pvt->remapbase;

        if (remap < pvt->remaplimit)
                return remap;

        e752x_printk(KERN_ERR, "Invalid page %lx - out of range\n", page);
        return pvt->tolm - 1;
}

static void do_process_ce(struct mem_ctl_info *mci, u16 error_one,
                        u32 sec1_add, u16 sec1_syndrome)
{
        u32 page;
        int row;
        int channel;
        int i;
        struct e752x_pvt *pvt = (struct e752x_pvt *)mci->pvt_info;

        edac_dbg(3, "\n");

        /* convert the addr to 4k page */
        page = sec1_add >> (PAGE_SHIFT - 4);

        /* FIXME - check for -1 */
        if (pvt->mc_symmetric) {
                /* chip select are bits 14 & 13 */
                row = ((page >> 1) & 3);
                e752x_printk(KERN_WARNING,
                        "Test row %d Table %d %d %d %d %d %d %d %d\n", row,
                        pvt->map[0], pvt->map[1], pvt->map[2], pvt->map[3],
                        pvt->map[4], pvt->map[5], pvt->map[6],
                        pvt->map[7]);

                /* test for channel remapping */
                for (i = 0; i < 8; i++) {
                        if (pvt->map[i] == row)
                                break;
                }

                e752x_printk(KERN_WARNING, "Test computed row %d\n", i);

                if (i < 8)
                        row = i;
                else
                        e752x_mc_printk(mci, KERN_WARNING,
                                        "row %d not found in remap table\n",
                                        row);
        } else
                row = edac_mc_find_csrow_by_page(mci, page);

        /* 0 = channel A, 1 = channel B */
        channel = !(error_one & 1);

        /* e752x mc reads 34:6 of the DRAM linear address */
        edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci, 1,
                             page, offset_in_page(sec1_add << 4), sec1_syndrome,
                             row, channel, -1,
                             "e752x CE", "");
}

static inline void process_ce(struct mem_ctl_info *mci, u16 error_one,
                        u32 sec1_add, u16 sec1_syndrome, int *error_found,
                        int handle_error)
{
        *error_found = 1;

        if (handle_error)
                do_process_ce(mci, error_one, sec1_add, sec1_syndrome);
}

static void do_process_ue(struct mem_ctl_info *mci, u16 error_one,
                        u32 ded_add, u32 scrb_add)
{
        u32 error_2b, block_page;
        int row;
        struct e752x_pvt *pvt = (struct e752x_pvt *)mci->pvt_info;

        edac_dbg(3, "\n");

        if (error_one & 0x0202) {
                error_2b = ded_add;

                /* convert to 4k address */
                block_page = error_2b >> (PAGE_SHIFT - 4);

                row = pvt->mc_symmetric ?
                /* chip select are bits 14 & 13 */
                        ((block_page >> 1) & 3) :
                        edac_mc_find_csrow_by_page(mci, block_page);

                /* e752x mc reads 34:6 of the DRAM linear address */
                edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1,
                                        block_page,
                                        offset_in_page(error_2b << 4), 0,
                                         row, -1, -1,
                                        "e752x UE from Read", "");

        }
        if (error_one & 0x0404) {
                error_2b = scrb_add;

                /* convert to 4k address */
                block_page = error_2b >> (PAGE_SHIFT - 4);

                row = pvt->mc_symmetric ?
                /* chip select are bits 14 & 13 */
                        ((block_page >> 1) & 3) :
                        edac_mc_find_csrow_by_page(mci, block_page);

                /* e752x mc reads 34:6 of the DRAM linear address */
                edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1,
                                        block_page,
                                        offset_in_page(error_2b << 4), 0,
                                        row, -1, -1,
                                        "e752x UE from Scruber", "");
        }
}

static inline void process_ue(struct mem_ctl_info *mci, u16 error_one,
                        u32 ded_add, u32 scrb_add, int *error_found,
                        int handle_error)
{
        *error_found = 1;

        if (handle_error)
                do_process_ue(mci, error_one, ded_add, scrb_add);
}

static inline void process_ue_no_info_wr(struct mem_ctl_info *mci,
                                         int *error_found, int handle_error)
{
        *error_found = 1;

        if (!handle_error)
                return;

        edac_dbg(3, "\n");
        edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1, 0, 0, 0,
                             -1, -1, -1,
                             "e752x UE log memory write", "");
}

static void do_process_ded_retry(struct mem_ctl_info *mci, u16 error,
                                 u32 retry_add)
{
        u32 error_1b, page;
        int row;
        struct e752x_pvt *pvt = (struct e752x_pvt *)mci->pvt_info;

        error_1b = retry_add;
        page = error_1b >> (PAGE_SHIFT - 4);  /* convert the addr to 4k page */

        /* chip select are bits 14 & 13 */
        row = pvt->mc_symmetric ? ((page >> 1) & 3) :
                edac_mc_find_csrow_by_page(mci, page);

        e752x_mc_printk(mci, KERN_WARNING,
                        "CE page 0x%lx, row %d : Memory read retry\n",
                        (long unsigned int)page, row);
}

static inline void process_ded_retry(struct mem_ctl_info *mci, u16 error,
                                u32 retry_add, int *error_found,
                                int handle_error)
{
        *error_found = 1;

        if (handle_error)
                do_process_ded_retry(mci, error, retry_add);
}

static inline void process_threshold_ce(struct mem_ctl_info *mci, u16 error,
                                        int *error_found, int handle_error)
{
        *error_found = 1;

        if (handle_error)
                e752x_mc_printk(mci, KERN_WARNING, "Memory threshold CE\n");
}

static char *global_message[11] = {
        "PCI Express C1",
        "PCI Express C",
        "PCI Express B1",
        "PCI Express B",
        "PCI Express A1",
        "PCI Express A",
        "DMA Controller",
        "HUB or NS Interface",
        "System Bus",
        "DRAM Controller",  /* 9th entry */
        "Internal Buffer"
};

#define DRAM_ENTRY      9

static char *fatal_message[2] = { "Non-Fatal ", "Fatal " };

static void do_global_error(int fatal, u32 errors)
{
        int i;

        for (i = 0; i < 11; i++) {
                if (errors & (1 << i)) {
                        /* If the error is from DRAM Controller OR
                         * we are to report ALL errors, then
                         * report the error
                         */
                        if ((i == DRAM_ENTRY) || report_non_memory_errors)
                                e752x_printk(KERN_WARNING, "%sError %s\n",
                                        fatal_message[fatal],
                                        global_message[i]);
                }
        }
}

static inline void global_error(int fatal, u32 errors, int *error_found,
                                int handle_error)
{
        *error_found = 1;

        if (handle_error)
                do_global_error(fatal, errors);
}

static char *hub_message[7] = {
        "HI Address or Command Parity", "HI Illegal Access",
        "HI Internal Parity", "Out of Range Access",
        "HI Data Parity", "Enhanced Config Access",
        "Hub Interface Target Abort"
};

static void do_hub_error(int fatal, u8 errors)
{
        int i;

        for (i = 0; i < 7; i++) {
                if (errors & (1 << i))
                        e752x_printk(KERN_WARNING, "%sError %s\n",
                                fatal_message[fatal], hub_message[i]);
        }
}

static inline void hub_error(int fatal, u8 errors, int *error_found,
                        int handle_error)
{
        *error_found = 1;

        if (handle_error)
                do_hub_error(fatal, errors);
}

#define NSI_FATAL_MASK          0x0c080081
#define NSI_NON_FATAL_MASK      0x23a0ba64
#define NSI_ERR_MASK            (NSI_FATAL_MASK | NSI_NON_FATAL_MASK)

static char *nsi_message[30] = {
        "NSI Link Down",        /* NSI_FERR/NSI_NERR bit 0, fatal error */
        "",                                             /* reserved */
        "NSI Parity Error",                             /* bit 2, non-fatal */
        "",                                             /* reserved */
        "",                                             /* reserved */
        "Correctable Error Message",                    /* bit 5, non-fatal */
        "Non-Fatal Error Message",                      /* bit 6, non-fatal */
        "Fatal Error Message",                          /* bit 7, fatal */
        "",                                             /* reserved */
        "Receiver Error",                               /* bit 9, non-fatal */
        "",                                             /* reserved */
        "Bad TLP",                                      /* bit 11, non-fatal */
        "Bad DLLP",                                     /* bit 12, non-fatal */
        "REPLAY_NUM Rollover",                          /* bit 13, non-fatal */
        "",                                             /* reserved */
        "Replay Timer Timeout",                         /* bit 15, non-fatal */
        "",                                             /* reserved */
        "",                                             /* reserved */
        "",                                             /* reserved */
        "Data Link Protocol Error",                     /* bit 19, fatal */
        "",                                             /* reserved */
        "Poisoned TLP",                                 /* bit 21, non-fatal */
        "",                                             /* reserved */
        "Completion Timeout",                           /* bit 23, non-fatal */
        "Completer Abort",                              /* bit 24, non-fatal */
        "Unexpected Completion",                        /* bit 25, non-fatal */
        "Receiver Overflow",                            /* bit 26, fatal */
        "Malformed TLP",                                /* bit 27, fatal */
        "",                                             /* reserved */
        "Unsupported Request"                           /* bit 29, non-fatal */
};

static void do_nsi_error(int fatal, u32 errors)
{
        int i;

        for (i = 0; i < 30; i++) {
                if (errors & (1 << i))
                        printk(KERN_WARNING "%sError %s\n",
                               fatal_message[fatal], nsi_message[i]);
        }
}

static inline void nsi_error(int fatal, u32 errors, int *error_found,
                int handle_error)
{
        *error_found = 1;

        if (handle_error)
                do_nsi_error(fatal, errors);
}

static char *membuf_message[4] = {
        "Internal PMWB to DRAM parity",
        "Internal PMWB to System Bus Parity",
        "Internal System Bus or IO to PMWB Parity",
        "Internal DRAM to PMWB Parity"
};

static void do_membuf_error(u8 errors)
{
        int i;

        for (i = 0; i < 4; i++) {
                if (errors & (1 << i))
                        e752x_printk(KERN_WARNING, "Non-Fatal Error %s\n",
                                membuf_message[i]);
        }
}

static inline void membuf_error(u8 errors, int *error_found, int handle_error)
{
        *error_found = 1;

        if (handle_error)
                do_membuf_error(errors);
}

static char *sysbus_message[10] = {
        "Addr or Request Parity",
        "Data Strobe Glitch",
        "Addr Strobe Glitch",
        "Data Parity",
        "Addr Above TOM",
        "Non DRAM Lock Error",
        "MCERR", "BINIT",
        "Memory Parity",
        "IO Subsystem Parity"
};

static void do_sysbus_error(int fatal, u32 errors)
{
        int i;

        for (i = 0; i < 10; i++) {
                if (errors & (1 << i))
                        e752x_printk(KERN_WARNING, "%sError System Bus %s\n",
                                fatal_message[fatal], sysbus_message[i]);
        }
}

static inline void sysbus_error(int fatal, u32 errors, int *error_found,
                                int handle_error)
{
        *error_found = 1;

        if (handle_error)
                do_sysbus_error(fatal, errors);
}

static void e752x_check_hub_interface(struct e752x_error_info *info,
                                int *error_found, int handle_error)
{
        u8 stat8;

        //pci_read_config_byte(dev,E752X_HI_FERR,&stat8);

        stat8 = info->hi_ferr;

        if (stat8 & 0x7f) {     /* Error, so process */
                stat8 &= 0x7f;

                if (stat8 & 0x2b)
                        hub_error(1, stat8 & 0x2b, error_found, handle_error);

                if (stat8 & 0x54)
                        hub_error(0, stat8 & 0x54, error_found, handle_error);
        }
        //pci_read_config_byte(dev,E752X_HI_NERR,&stat8);

        stat8 = info->hi_nerr;

        if (stat8 & 0x7f) {     /* Error, so process */
                stat8 &= 0x7f;

                if (stat8 & 0x2b)
                        hub_error(1, stat8 & 0x2b, error_found, handle_error);

                if (stat8 & 0x54)
                        hub_error(0, stat8 & 0x54, error_found, handle_error);
        }
}

static void e752x_check_ns_interface(struct e752x_error_info *info,
                                int *error_found, int handle_error)
{
        u32 stat32;

        stat32 = info->nsi_ferr;
        if (stat32 & NSI_ERR_MASK) { /* Error, so process */
                if (stat32 & NSI_FATAL_MASK)    /* check for fatal errors */
                        nsi_error(1, stat32 & NSI_FATAL_MASK, error_found,
                                  handle_error);
                if (stat32 & NSI_NON_FATAL_MASK) /* check for non-fatal ones */
                        nsi_error(0, stat32 & NSI_NON_FATAL_MASK, error_found,
                                  handle_error);
        }
        stat32 = info->nsi_nerr;
        if (stat32 & NSI_ERR_MASK) {
                if (stat32 & NSI_FATAL_MASK)
                        nsi_error(1, stat32 & NSI_FATAL_MASK, error_found,
                                  handle_error);
                if (stat32 & NSI_NON_FATAL_MASK)
                        nsi_error(0, stat32 & NSI_NON_FATAL_MASK, error_found,
                                  handle_error);
        }
}

static void e752x_check_sysbus(struct e752x_error_info *info,
                        int *error_found, int handle_error)
{
        u32 stat32, error32;

        //pci_read_config_dword(dev,E752X_SYSBUS_FERR,&stat32);
        stat32 = info->sysbus_ferr + (info->sysbus_nerr << 16);

        if (stat32 == 0)
                return;         /* no errors */

        error32 = (stat32 >> 16) & 0x3ff;
        stat32 = stat32 & 0x3ff;

        if (stat32 & 0x087)
                sysbus_error(1, stat32 & 0x087, error_found, handle_error);

        if (stat32 & 0x378)
                sysbus_error(0, stat32 & 0x378, error_found, handle_error);

        if (error32 & 0x087)
                sysbus_error(1, error32 & 0x087, error_found, handle_error);

        if (error32 & 0x378)
                sysbus_error(0, error32 & 0x378, error_found, handle_error);
}

static void e752x_check_membuf(struct e752x_error_info *info,
                        int *error_found, int handle_error)
{
        u8 stat8;

        stat8 = info->buf_ferr;

        if (stat8 & 0x0f) {     /* Error, so process */
                stat8 &= 0x0f;
                membuf_error(stat8, error_found, handle_error);
        }

        stat8 = info->buf_nerr;

        if (stat8 & 0x0f) {     /* Error, so process */
                stat8 &= 0x0f;
                membuf_error(stat8, error_found, handle_error);
        }
}

static void e752x_check_dram(struct mem_ctl_info *mci,
                        struct e752x_error_info *info, int *error_found,
                        int handle_error)
{
        u16 error_one, error_next;

        error_one = info->dram_ferr;
        error_next = info->dram_nerr;

        /* decode and report errors */
        if (error_one & 0x0101) /* check first error correctable */
                process_ce(mci, error_one, info->dram_sec1_add,
                        info->dram_sec1_syndrome, error_found, handle_error);

        if (error_next & 0x0101)        /* check next error correctable */
                process_ce(mci, error_next, info->dram_sec2_add,
                        info->dram_sec2_syndrome, error_found, handle_error);

        if (error_one & 0x4040)
                process_ue_no_info_wr(mci, error_found, handle_error);

        if (error_next & 0x4040)
                process_ue_no_info_wr(mci, error_found, handle_error);

        if (error_one & 0x2020)
                process_ded_retry(mci, error_one, info->dram_retr_add,
                                error_found, handle_error);

        if (error_next & 0x2020)
                process_ded_retry(mci, error_next, info->dram_retr_add,
                                error_found, handle_error);

        if (error_one & 0x0808)
                process_threshold_ce(mci, error_one, error_found, handle_error);

        if (error_next & 0x0808)
                process_threshold_ce(mci, error_next, error_found,
                                handle_error);

        if (error_one & 0x0606)
                process_ue(mci, error_one, info->dram_ded_add,
                        info->dram_scrb_add, error_found, handle_error);

        if (error_next & 0x0606)
                process_ue(mci, error_next, info->dram_ded_add,
                        info->dram_scrb_add, error_found, handle_error);
}

static void e752x_get_error_info(struct mem_ctl_info *mci,
                                 struct e752x_error_info *info)
{
        struct pci_dev *dev;
        struct e752x_pvt *pvt;

        memset(info, 0, sizeof(*info));
        pvt = (struct e752x_pvt *)mci->pvt_info;
        dev = pvt->dev_d0f1;
        pci_read_config_dword(dev, E752X_FERR_GLOBAL, &info->ferr_global);

        if (info->ferr_global) {
                if (pvt->dev_info->err_dev == PCI_DEVICE_ID_INTEL_3100_1_ERR) {
                        pci_read_config_dword(dev, I3100_NSI_FERR,
                                             &info->nsi_ferr);
                        info->hi_ferr = 0;
                } else {
                        pci_read_config_byte(dev, E752X_HI_FERR,
                                             &info->hi_ferr);
                        info->nsi_ferr = 0;
                }
                pci_read_config_word(dev, E752X_SYSBUS_FERR,
                                &info->sysbus_ferr);
                pci_read_config_byte(dev, E752X_BUF_FERR, &info->buf_ferr);
                pci_read_config_word(dev, E752X_DRAM_FERR, &info->dram_ferr);
                pci_read_config_dword(dev, E752X_DRAM_SEC1_ADD,
                                &info->dram_sec1_add);
                pci_read_config_word(dev, E752X_DRAM_SEC1_SYNDROME,
                                &info->dram_sec1_syndrome);
                pci_read_config_dword(dev, E752X_DRAM_DED_ADD,
                                &info->dram_ded_add);
                pci_read_config_dword(dev, E752X_DRAM_SCRB_ADD,
                                &info->dram_scrb_add);
                pci_read_config_dword(dev, E752X_DRAM_RETR_ADD,
                                &info->dram_retr_add);

                /* ignore the reserved bits just in case */
                if (info->hi_ferr & 0x7f)
                        pci_write_config_byte(dev, E752X_HI_FERR,
                                        info->hi_ferr);

                if (info->nsi_ferr & NSI_ERR_MASK)
                        pci_write_config_dword(dev, I3100_NSI_FERR,
                                        info->nsi_ferr);

                if (info->sysbus_ferr)
                        pci_write_config_word(dev, E752X_SYSBUS_FERR,
                                        info->sysbus_ferr);

                if (info->buf_ferr & 0x0f)
                        pci_write_config_byte(dev, E752X_BUF_FERR,
                                        info->buf_ferr);

                if (info->dram_ferr)
                        pci_write_bits16(pvt->dev_d0f1, E752X_DRAM_FERR,
                                         info->dram_ferr, info->dram_ferr);

                pci_write_config_dword(dev, E752X_FERR_GLOBAL,
                                info->ferr_global);
        }

        pci_read_config_dword(dev, E752X_NERR_GLOBAL, &info->nerr_global);

        if (info->nerr_global) {
                if (pvt->dev_info->err_dev == PCI_DEVICE_ID_INTEL_3100_1_ERR) {
                        pci_read_config_dword(dev, I3100_NSI_NERR,
                                             &info->nsi_nerr);
                        info->hi_nerr = 0;
                } else {
                        pci_read_config_byte(dev, E752X_HI_NERR,
                                             &info->hi_nerr);
                        info->nsi_nerr = 0;
                }
                pci_read_config_word(dev, E752X_SYSBUS_NERR,
                                &info->sysbus_nerr);
                pci_read_config_byte(dev, E752X_BUF_NERR, &info->buf_nerr);
                pci_read_config_word(dev, E752X_DRAM_NERR, &info->dram_nerr);
                pci_read_config_dword(dev, E752X_DRAM_SEC2_ADD,
                                &info->dram_sec2_add);
                pci_read_config_word(dev, E752X_DRAM_SEC2_SYNDROME,
                                &info->dram_sec2_syndrome);

                if (info->hi_nerr & 0x7f)
                        pci_write_config_byte(dev, E752X_HI_NERR,
                                        info->hi_nerr);

                if (info->nsi_nerr & NSI_ERR_MASK)
                        pci_write_config_dword(dev, I3100_NSI_NERR,
                                        info->nsi_nerr);

                if (info->sysbus_nerr)
                        pci_write_config_word(dev, E752X_SYSBUS_NERR,
                                        info->sysbus_nerr);

                if (info->buf_nerr & 0x0f)
                        pci_write_config_byte(dev, E752X_BUF_NERR,
                                        info->buf_nerr);

                if (info->dram_nerr)
                        pci_write_bits16(pvt->dev_d0f1, E752X_DRAM_NERR,
                                         info->dram_nerr, info->dram_nerr);

                pci_write_config_dword(dev, E752X_NERR_GLOBAL,
                                info->nerr_global);
        }
}

static int e752x_process_error_info(struct mem_ctl_info *mci,
                                struct e752x_error_info *info,
                                int handle_errors)
{
        u32 error32, stat32;
        int error_found;

        error_found = 0;
        error32 = (info->ferr_global >> 18) & 0x3ff;
        stat32 = (info->ferr_global >> 4) & 0x7ff;

        if (error32)
                global_error(1, error32, &error_found, handle_errors);

        if (stat32)
                global_error(0, stat32, &error_found, handle_errors);

        error32 = (info->nerr_global >> 18) & 0x3ff;
        stat32 = (info->nerr_global >> 4) & 0x7ff;

        if (error32)
                global_error(1, error32, &error_found, handle_errors);

        if (stat32)
                global_error(0, stat32, &error_found, handle_errors);

        e752x_check_hub_interface(info, &error_found, handle_errors);
        e752x_check_ns_interface(info, &error_found, handle_errors);
        e752x_check_sysbus(info, &error_found, handle_errors);
        e752x_check_membuf(info, &error_found, handle_errors);
        e752x_check_dram(mci, info, &error_found, handle_errors);
        return error_found;
}

static void e752x_check(struct mem_ctl_info *mci)
{
        struct e752x_error_info info;

        e752x_get_error_info(mci, &info);
        e752x_process_error_info(mci, &info, 1);
}

/* Program byte/sec bandwidth scrub rate to hardware */
static int set_sdram_scrub_rate(struct mem_ctl_info *mci, u32 new_bw)
{
        const struct scrubrate *scrubrates;
        struct e752x_pvt *pvt = (struct e752x_pvt *) mci->pvt_info;
        struct pci_dev *pdev = pvt->dev_d0f0;
        int i;

        if (pvt->dev_info->ctl_dev == PCI_DEVICE_ID_INTEL_3100_0)
                scrubrates = scrubrates_i3100;
        else
                scrubrates = scrubrates_e752x;

        /* Translate the desired scrub rate to a e752x/3100 register value.

         * Search for the bandwidth that is equal or greater than the
         * desired rate and program the cooresponding register value.
         */
        for (i = 0; scrubrates[i].bandwidth != SDRATE_EOT; i++)
                if (scrubrates[i].bandwidth >= new_bw)
                        break;

        if (scrubrates[i].bandwidth == SDRATE_EOT)
                return -1;

        pci_write_config_word(pdev, E752X_MCHSCRB, scrubrates[i].scrubval);

        return scrubrates[i].bandwidth;
}

/* Convert current scrub rate value into byte/sec bandwidth */
static int get_sdram_scrub_rate(struct mem_ctl_info *mci)
{
        const struct scrubrate *scrubrates;
        struct e752x_pvt *pvt = (struct e752x_pvt *) mci->pvt_info;
        struct pci_dev *pdev = pvt->dev_d0f0;
        u16 scrubval;
        int i;

        if (pvt->dev_info->ctl_dev == PCI_DEVICE_ID_INTEL_3100_0)
                scrubrates = scrubrates_i3100;
        else
                scrubrates = scrubrates_e752x;

        /* Find the bandwidth matching the memory scrubber configuration */
        pci_read_config_word(pdev, E752X_MCHSCRB, &scrubval);
        scrubval = scrubval & 0x0f;

        for (i = 0; scrubrates[i].bandwidth != SDRATE_EOT; i++)
                if (scrubrates[i].scrubval == scrubval)
                        break;

        if (scrubrates[i].bandwidth == SDRATE_EOT) {
                e752x_printk(KERN_WARNING,
                        "Invalid sdram scrub control value: 0x%x\n", scrubval);
                return -1;
        }
        return scrubrates[i].bandwidth;

}

/* Return 1 if dual channel mode is active.  Else return 0. */
static inline int dual_channel_active(u16 ddrcsr)
{
        return (((ddrcsr >> 12) & 3) == 3);
}

/* Remap csrow index numbers if map_type is "reverse"
 */
static inline int remap_csrow_index(struct mem_ctl_info *mci, int index)
{
        struct e752x_pvt *pvt = mci->pvt_info;

        if (!pvt->map_type)
                return (7 - index);

        return (index);
}

static void e752x_init_csrows(struct mem_ctl_info *mci, struct pci_dev *pdev,
                        u16 ddrcsr)
{
        struct csrow_info *csrow;
        enum edac_type edac_mode;
        unsigned long last_cumul_size;
        int index, mem_dev, drc_chan;
        int drc_drbg;           /* DRB granularity 0=64mb, 1=128mb */
        int drc_ddim;           /* DRAM Data Integrity Mode 0=none, 2=edac */
        u8 value;
        u32 dra, drc, cumul_size, i, nr_pages;

        dra = 0;
        for (index = 0; index < 4; index++) {
                u8 dra_reg;
                pci_read_config_byte(pdev, E752X_DRA + index, &dra_reg);
                dra |= dra_reg << (index * 8);
        }
        pci_read_config_dword(pdev, E752X_DRC, &drc);
        drc_chan = dual_channel_active(ddrcsr) ? 1 : 0;
        drc_drbg = drc_chan + 1;        /* 128 in dual mode, 64 in single */
        drc_ddim = (drc >> 20) & 0x3;

        /* The dram row boundary (DRB) reg values are boundary address for
         * each DRAM row with a granularity of 64 or 128MB (single/dual
         * channel operation).  DRB regs are cumulative; therefore DRB7 will
         * contain the total memory contained in all eight rows.
         */
        for (last_cumul_size = index = 0; index < mci->nr_csrows; index++) {
                /* mem_dev 0=x8, 1=x4 */
                mem_dev = (dra >> (index * 4 + 2)) & 0x3;
                csrow = mci->csrows[remap_csrow_index(mci, index)];

                mem_dev = (mem_dev == 2);
                pci_read_config_byte(pdev, E752X_DRB + index, &value);
                /* convert a 128 or 64 MiB DRB to a page size. */
                cumul_size = value << (25 + drc_drbg - PAGE_SHIFT);
                edac_dbg(3, "(%d) cumul_size 0x%x\n", index, cumul_size);
                if (cumul_size == last_cumul_size)
                        continue;       /* not populated */

                csrow->first_page = last_cumul_size;
                csrow->last_page = cumul_size - 1;
                nr_pages = cumul_size - last_cumul_size;
                last_cumul_size = cumul_size;

                /*
                * if single channel or x8 devices then SECDED
                * if dual channel and x4 then S4ECD4ED
                */
                if (drc_ddim) {
                        if (drc_chan && mem_dev) {
                                edac_mode = EDAC_S4ECD4ED;
                                mci->edac_cap |= EDAC_FLAG_S4ECD4ED;
                        } else {
                                edac_mode = EDAC_SECDED;
                                mci->edac_cap |= EDAC_FLAG_SECDED;
                        }
                } else
                        edac_mode = EDAC_NONE;
                for (i = 0; i < csrow->nr_channels; i++) {
                        struct dimm_info *dimm = csrow->channels[i]->dimm;

                        edac_dbg(3, "Initializing rank at (%i,%i)\n", index, i);
                        dimm->nr_pages = nr_pages / csrow->nr_channels;
                        dimm->grain = 1 << 12;  /* 4KiB - resolution of CELOG */
                        dimm->mtype = MEM_RDDR; /* only one type supported */
                        dimm->dtype = mem_dev ? DEV_X4 : DEV_X8;
                        dimm->edac_mode = edac_mode;
                }
        }
}

static void e752x_init_mem_map_table(struct pci_dev *pdev,
                                struct e752x_pvt *pvt)
{
        int index;
        u8 value, last, row;

        last = 0;
        row = 0;

        for (index = 0; index < 8; index += 2) {
                pci_read_config_byte(pdev, E752X_DRB + index, &value);
                /* test if there is a dimm in this slot */
                if (value == last) {
                        /* no dimm in the slot, so flag it as empty */
                        pvt->map[index] = 0xff;
                        pvt->map[index + 1] = 0xff;
                } else {        /* there is a dimm in the slot */
                        pvt->map[index] = row;
                        row++;
                        last = value;
                        /* test the next value to see if the dimm is double
                         * sided
                         */
                        pci_read_config_byte(pdev, E752X_DRB + index + 1,
                                        &value);

                        /* the dimm is single sided, so flag as empty */
                        /* this is a double sided dimm to save the next row #*/
                        pvt->map[index + 1] = (value == last) ? 0xff :  row;
                        row++;
                        last = value;
                }
        }
}

/* Return 0 on success or 1 on failure. */
static int e752x_get_devs(struct pci_dev *pdev, int dev_idx,
                        struct e752x_pvt *pvt)
{
        pvt->dev_d0f1 = pci_get_device(PCI_VENDOR_ID_INTEL,
                                pvt->dev_info->err_dev, NULL);

        if (pvt->dev_d0f1 == NULL) {
                pvt->dev_d0f1 = pci_scan_single_device(pdev->bus,
                                                        PCI_DEVFN(0, 1));
                pci_dev_get(pvt->dev_d0f1);
        }

        if (pvt->dev_d0f1 == NULL) {
                e752x_printk(KERN_ERR, "error reporting device not found:"
                        "vendor %x device 0x%x (broken BIOS?)\n",
                        PCI_VENDOR_ID_INTEL, e752x_devs[dev_idx].err_dev);
                return 1;
        }

        pvt->dev_d0f0 = pci_get_device(PCI_VENDOR_ID_INTEL,
                                e752x_devs[dev_idx].ctl_dev,
                                NULL);

        if (pvt->dev_d0f0 == NULL)
                goto fail;

        return 0;

fail:
        pci_dev_put(pvt->dev_d0f1);
        return 1;
}

/* Setup system bus parity mask register.
 * Sysbus parity supported on:
 * e7320/e7520/e7525 + Xeon
 */
static void e752x_init_sysbus_parity_mask(struct e752x_pvt *pvt)
{
        char *cpu_id = cpu_data(0).x86_model_id;
        struct pci_dev *dev = pvt->dev_d0f1;
        int enable = 1;

        /* Allow module parameter override, else see if CPU supports parity */
        if (sysbus_parity != -1) {
                enable = sysbus_parity;
        } else if (cpu_id[0] && !strstr(cpu_id, "Xeon")) {
                e752x_printk(KERN_INFO, "System Bus Parity not "
                             "supported by CPU, disabling\n");
                enable = 0;
        }

        if (enable)
                pci_write_config_word(dev, E752X_SYSBUS_ERRMASK, 0x0000);
        else
                pci_write_config_word(dev, E752X_SYSBUS_ERRMASK, 0x0309);
}

static void e752x_init_error_reporting_regs(struct e752x_pvt *pvt)
{
        struct pci_dev *dev;

        dev = pvt->dev_d0f1;
        /* Turn off error disable & SMI in case the BIOS turned it on */
        if (pvt->dev_info->err_dev == PCI_DEVICE_ID_INTEL_3100_1_ERR) {
                pci_write_config_dword(dev, I3100_NSI_EMASK, 0);
                pci_write_config_dword(dev, I3100_NSI_SMICMD, 0);
        } else {
                pci_write_config_byte(dev, E752X_HI_ERRMASK, 0x00);
                pci_write_config_byte(dev, E752X_HI_SMICMD, 0x00);
        }

        e752x_init_sysbus_parity_mask(pvt);

        pci_write_config_word(dev, E752X_SYSBUS_SMICMD, 0x00);
        pci_write_config_byte(dev, E752X_BUF_ERRMASK, 0x00);
        pci_write_config_byte(dev, E752X_BUF_SMICMD, 0x00);
        pci_write_config_byte(dev, E752X_DRAM_ERRMASK, 0x00);
        pci_write_config_byte(dev, E752X_DRAM_SMICMD, 0x00);
}

static int e752x_probe1(struct pci_dev *pdev, int dev_idx)
{
        u16 pci_data;
        u8 stat8;
        struct mem_ctl_info *mci;
        struct edac_mc_layer layers[2];
        struct e752x_pvt *pvt;
        u16 ddrcsr;
        int drc_chan;           /* Number of channels 0=1chan,1=2chan */
        struct e752x_error_info discard;

        edac_dbg(0, "mci\n");
        edac_dbg(0, "Starting Probe1\n");

        /* check to see if device 0 function 1 is enabled; if it isn't, we
         * assume the BIOS has reserved it for a reason and is expecting
         * exclusive access, we take care not to violate that assumption and
         * fail the probe. */
        pci_read_config_byte(pdev, E752X_DEVPRES1, &stat8);
        if (!force_function_unhide && !(stat8 & (1 << 5))) {
                printk(KERN_INFO "Contact your BIOS vendor to see if the "
                        "E752x error registers can be safely un-hidden\n");
                return -ENODEV;
        }
        stat8 |= (1 << 5);
        pci_write_config_byte(pdev, E752X_DEVPRES1, stat8);

        pci_read_config_word(pdev, E752X_DDRCSR, &ddrcsr);
        /* FIXME: should check >>12 or 0xf, true for all? */
        /* Dual channel = 1, Single channel = 0 */
        drc_chan = dual_channel_active(ddrcsr);

        layers[0].type = EDAC_MC_LAYER_CHIP_SELECT;
        layers[0].size = E752X_NR_CSROWS;
        layers[0].is_virt_csrow = true;
        layers[1].type = EDAC_MC_LAYER_CHANNEL;
        layers[1].size = drc_chan + 1;
        layers[1].is_virt_csrow = false;
        mci = edac_mc_alloc(0, ARRAY_SIZE(layers), layers, sizeof(*pvt));
        if (mci == NULL)
                return -ENOMEM;

        edac_dbg(3, "init mci\n");
        mci->mtype_cap = MEM_FLAG_RDDR;
        /* 3100 IMCH supports SECDEC only */
        mci->edac_ctl_cap = (dev_idx == I3100) ? EDAC_FLAG_SECDED :
                (EDAC_FLAG_NONE | EDAC_FLAG_SECDED | EDAC_FLAG_S4ECD4ED);
        /* FIXME - what if different memory types are in different csrows? */
        mci->mod_name = EDAC_MOD_STR;
        mci->pdev = &pdev->dev;

        edac_dbg(3, "init pvt\n");
        pvt = (struct e752x_pvt *)mci->pvt_info;
        pvt->dev_info = &e752x_devs[dev_idx];
        pvt->mc_symmetric = ((ddrcsr & 0x10) != 0);

        if (e752x_get_devs(pdev, dev_idx, pvt)) {
                edac_mc_free(mci);
                return -ENODEV;
        }

        edac_dbg(3, "more mci init\n");
        mci->ctl_name = pvt->dev_info->ctl_name;
        mci->dev_name = pci_name(pdev);
        mci->edac_check = e752x_check;
        mci->ctl_page_to_phys = ctl_page_to_phys;
        mci->set_sdram_scrub_rate = set_sdram_scrub_rate;
        mci->get_sdram_scrub_rate = get_sdram_scrub_rate;

        /* set the map type.  1 = normal, 0 = reversed
         * Must be set before e752x_init_csrows in case csrow mapping
         * is reversed.
         */
        pci_read_config_byte(pdev, E752X_DRM, &stat8);
        pvt->map_type = ((stat8 & 0x0f) > ((stat8 >> 4) & 0x0f));

        e752x_init_csrows(mci, pdev, ddrcsr);
        e752x_init_mem_map_table(pdev, pvt);

        if (dev_idx == I3100)
                mci->edac_cap = EDAC_FLAG_SECDED; /* the only mode supported */
        else
                mci->edac_cap |= EDAC_FLAG_NONE;
        edac_dbg(3, "tolm, remapbase, remaplimit\n");

        /* load the top of low memory, remap base, and remap limit vars */
        pci_read_config_word(pdev, E752X_TOLM, &pci_data);
        pvt->tolm = ((u32) pci_data) << 4;
        pci_read_config_word(pdev, E752X_REMAPBASE, &pci_data);
        pvt->remapbase = ((u32) pci_data) << 14;
        pci_read_config_word(pdev, E752X_REMAPLIMIT, &pci_data);
        pvt->remaplimit = ((u32) pci_data) << 14;
        e752x_printk(KERN_INFO,
                        "tolm = %x, remapbase = %x, remaplimit = %x\n",
                        pvt->tolm, pvt->remapbase, pvt->remaplimit);

        /* Here we assume that we will never see multiple instances of this
         * type of memory controller.  The ID is therefore hardcoded to 0.
         */
        if (edac_mc_add_mc(mci)) {
                edac_dbg(3, "failed edac_mc_add_mc()\n");
                goto fail;
        }

        e752x_init_error_reporting_regs(pvt);
        e752x_get_error_info(mci, &discard);    /* clear other MCH errors */

        /* allocating generic PCI control info */
        e752x_pci = edac_pci_create_generic_ctl(&pdev->dev, EDAC_MOD_STR);
        if (!e752x_pci) {
                printk(KERN_WARNING
                        "%s(): Unable to create PCI control\n", __func__);
                printk(KERN_WARNING
                        "%s(): PCI error report via EDAC not setup\n",
                        __func__);
        }

        /* get this far and it's successful */
        edac_dbg(3, "success\n");
        return 0;

fail:
        pci_dev_put(pvt->dev_d0f0);
        pci_dev_put(pvt->dev_d0f1);
        edac_mc_free(mci);

        return -ENODEV;
}

/* returns count (>= 0), or negative on error */
static int e752x_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
{
        edac_dbg(0, "\n");

        /* wake up and enable device */
        if (pci_enable_device(pdev) < 0)
                return -EIO;

        return e752x_probe1(pdev, ent->driver_data);
}

static void e752x_remove_one(struct pci_dev *pdev)
{
        struct mem_ctl_info *mci;
        struct e752x_pvt *pvt;

        edac_dbg(0, "\n");

        if (e752x_pci)
                edac_pci_release_generic_ctl(e752x_pci);

        if ((mci = edac_mc_del_mc(&pdev->dev)) == NULL)
                return;

        pvt = (struct e752x_pvt *)mci->pvt_info;
        pci_dev_put(pvt->dev_d0f0);
        pci_dev_put(pvt->dev_d0f1);
        edac_mc_free(mci);
}

static const struct pci_device_id e752x_pci_tbl[] = {
        {
         PCI_VEND_DEV(INTEL, 7520_0), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
         E7520},
        {
         PCI_VEND_DEV(INTEL, 7525_0), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
         E7525},
        {
         PCI_VEND_DEV(INTEL, 7320_0), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
         E7320},
        {
         PCI_VEND_DEV(INTEL, 3100_0), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
         I3100},
        {
         0,
         }                      /* 0 terminated list. */
};

MODULE_DEVICE_TABLE(pci, e752x_pci_tbl);

static struct pci_driver e752x_driver = {
        .name = EDAC_MOD_STR,
        .probe = e752x_init_one,
        .remove = e752x_remove_one,
        .id_table = e752x_pci_tbl,
};

static int __init e752x_init(void)
{
        int pci_rc;

        edac_dbg(3, "\n");

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

        pci_rc = pci_register_driver(&e752x_driver);
        return (pci_rc < 0) ? pci_rc : 0;
}

static void __exit e752x_exit(void)
{
        edac_dbg(3, "\n");
        pci_unregister_driver(&e752x_driver);
}

module_init(e752x_init);
module_exit(e752x_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Linux Networx (http://lnxi.com) Tom Zimmerman\n");
MODULE_DESCRIPTION("MC support for Intel e752x/3100 memory controllers");

module_param(force_function_unhide, int, 0444);
MODULE_PARM_DESC(force_function_unhide, "if BIOS sets Dev0:Fun1 up as hidden:"
                 " 1=force unhide and hope BIOS doesn't fight driver for "
                "Dev0:Fun1 access");

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

module_param(sysbus_parity, int, 0444);
MODULE_PARM_DESC(sysbus_parity, "0=disable system bus parity checking,"
                " 1=enable system bus parity checking, default=auto-detect");
module_param(report_non_memory_errors, int, 0644);
MODULE_PARM_DESC(report_non_memory_errors, "0=disable non-memory error "
                "reporting, 1=enable non-memory error reporting");