amd64_edac: add ECC chipkill syndrome mapping table

[safe/jmp/linux-2.6] / drivers / edac / amd64_edac.c

#include "amd64_edac.h"

static struct edac_pci_ctl_info *amd64_ctl_pci;

static int report_gart_errors;
module_param(report_gart_errors, int, 0644);

/*
 * Set by command line parameter. If BIOS has enabled the ECC, this override is
 * cleared to prevent re-enabling the hardware by this driver.
 */
static int ecc_enable_override;
module_param(ecc_enable_override, int, 0644);

/* Lookup table for all possible MC control instances */
struct amd64_pvt;
static struct mem_ctl_info *mci_lookup[MAX_NUMNODES];
static struct amd64_pvt *pvt_lookup[MAX_NUMNODES];

/*
 * Memory scrubber control interface. For K8, memory scrubbing is handled by
 * hardware and can involve L2 cache, dcache as well as the main memory. With
 * F10, this is extended to L3 cache scrubbing on CPU models sporting that
 * functionality.
 *
 * This causes the "units" for the scrubbing speed to vary from 64 byte blocks
 * (dram) over to cache lines. This is nasty, so we will use bandwidth in
 * bytes/sec for the setting.
 *
 * Currently, we only do dram scrubbing. If the scrubbing is done in software on
 * other archs, we might not have access to the caches directly.
 */

/*
 * scan the scrub rate mapping table for a close or matching bandwidth value to
 * issue. If requested is too big, then use last maximum value found.
 */
static int amd64_search_set_scrub_rate(struct pci_dev *ctl, u32 new_bw,
                                       u32 min_scrubrate)
{
        u32 scrubval;
        int i;

        /*
         * map the configured rate (new_bw) to a value specific to the AMD64
         * memory controller and apply to register. Search for the first
         * bandwidth entry that is greater or equal than the setting requested
         * and program that. If at last entry, turn off DRAM scrubbing.
         */
        for (i = 0; i < ARRAY_SIZE(scrubrates); i++) {
                /*
                 * skip scrub rates which aren't recommended
                 * (see F10 BKDG, F3x58)
                 */
                if (scrubrates[i].scrubval < min_scrubrate)
                        continue;

                if (scrubrates[i].bandwidth <= new_bw)
                        break;

                /*
                 * if no suitable bandwidth found, turn off DRAM scrubbing
                 * entirely by falling back to the last element in the
                 * scrubrates array.
                 */
        }

        scrubval = scrubrates[i].scrubval;
        if (scrubval)
                edac_printk(KERN_DEBUG, EDAC_MC,
                            "Setting scrub rate bandwidth: %u\n",
                            scrubrates[i].bandwidth);
        else
                edac_printk(KERN_DEBUG, EDAC_MC, "Turning scrubbing off.\n");

        pci_write_bits32(ctl, K8_SCRCTRL, scrubval, 0x001F);

        return 0;
}

static int amd64_set_scrub_rate(struct mem_ctl_info *mci, u32 *bandwidth)
{
        struct amd64_pvt *pvt = mci->pvt_info;
        u32 min_scrubrate = 0x0;

        switch (boot_cpu_data.x86) {
        case 0xf:
                min_scrubrate = K8_MIN_SCRUB_RATE_BITS;
                break;
        case 0x10:
                min_scrubrate = F10_MIN_SCRUB_RATE_BITS;
                break;
        case 0x11:
                min_scrubrate = F11_MIN_SCRUB_RATE_BITS;
                break;

        default:
                amd64_printk(KERN_ERR, "Unsupported family!\n");
                break;
        }
        return amd64_search_set_scrub_rate(pvt->misc_f3_ctl, *bandwidth,
                        min_scrubrate);
}

static int amd64_get_scrub_rate(struct mem_ctl_info *mci, u32 *bw)
{
        struct amd64_pvt *pvt = mci->pvt_info;
        u32 scrubval = 0;
        int status = -1, i, ret = 0;

        ret = pci_read_config_dword(pvt->misc_f3_ctl, K8_SCRCTRL, &scrubval);
        if (ret)
                debugf0("Reading K8_SCRCTRL failed\n");

        scrubval = scrubval & 0x001F;

        edac_printk(KERN_DEBUG, EDAC_MC,
                    "pci-read, sdram scrub control value: %d \n", scrubval);

        for (i = 0; ARRAY_SIZE(scrubrates); i++) {
                if (scrubrates[i].scrubval == scrubval) {
                        *bw = scrubrates[i].bandwidth;
                        status = 0;
                        break;
                }
        }

        return status;
}

/* Map from a CSROW entry to the mask entry that operates on it */
static inline u32 amd64_map_to_dcs_mask(struct amd64_pvt *pvt, int csrow)
{
        return csrow >> (pvt->num_dcsm >> 3);
}

/* return the 'base' address the i'th CS entry of the 'dct' DRAM controller */
static u32 amd64_get_dct_base(struct amd64_pvt *pvt, int dct, int csrow)
{
        if (dct == 0)
                return pvt->dcsb0[csrow];
        else
                return pvt->dcsb1[csrow];
}

/*
 * Return the 'mask' address the i'th CS entry. This function is needed because
 * there number of DCSM registers on Rev E and prior vs Rev F and later is
 * different.
 */
static u32 amd64_get_dct_mask(struct amd64_pvt *pvt, int dct, int csrow)
{
        if (dct == 0)
                return pvt->dcsm0[amd64_map_to_dcs_mask(pvt, csrow)];
        else
                return pvt->dcsm1[amd64_map_to_dcs_mask(pvt, csrow)];
}


/*
 * In *base and *limit, pass back the full 40-bit base and limit physical
 * addresses for the node given by node_id.  This information is obtained from
 * DRAM Base (section 3.4.4.1) and DRAM Limit (section 3.4.4.2) registers. The
 * base and limit addresses are of type SysAddr, as defined at the start of
 * section 3.4.4 (p. 70).  They are the lowest and highest physical addresses
 * in the address range they represent.
 */
static void amd64_get_base_and_limit(struct amd64_pvt *pvt, int node_id,
                               u64 *base, u64 *limit)
{
        *base = pvt->dram_base[node_id];
        *limit = pvt->dram_limit[node_id];
}

/*
 * Return 1 if the SysAddr given by sys_addr matches the base/limit associated
 * with node_id
 */
static int amd64_base_limit_match(struct amd64_pvt *pvt,
                                        u64 sys_addr, int node_id)
{
        u64 base, limit, addr;

        amd64_get_base_and_limit(pvt, node_id, &base, &limit);

        /* The K8 treats this as a 40-bit value.  However, bits 63-40 will be
         * all ones if the most significant implemented address bit is 1.
         * Here we discard bits 63-40.  See section 3.4.2 of AMD publication
         * 24592: AMD x86-64 Architecture Programmer's Manual Volume 1
         * Application Programming.
         */
        addr = sys_addr & 0x000000ffffffffffull;

        return (addr >= base) && (addr <= limit);
}

/*
 * Attempt to map a SysAddr to a node. On success, return a pointer to the
 * mem_ctl_info structure for the node that the SysAddr maps to.
 *
 * On failure, return NULL.
 */
static struct mem_ctl_info *find_mc_by_sys_addr(struct mem_ctl_info *mci,
                                                u64 sys_addr)
{
        struct amd64_pvt *pvt;
        int node_id;
        u32 intlv_en, bits;

        /*
         * Here we use the DRAM Base (section 3.4.4.1) and DRAM Limit (section
         * 3.4.4.2) registers to map the SysAddr to a node ID.
         */
        pvt = mci->pvt_info;

        /*
         * The value of this field should be the same for all DRAM Base
         * registers.  Therefore we arbitrarily choose to read it from the
         * register for node 0.
         */
        intlv_en = pvt->dram_IntlvEn[0];

        if (intlv_en == 0) {
                for (node_id = 0; ; ) {
                        if (amd64_base_limit_match(pvt, sys_addr, node_id))
                                break;

                        if (++node_id >= DRAM_REG_COUNT)
                                goto err_no_match;
                }
                goto found;
        }

        if (unlikely((intlv_en != (0x01 << 8)) &&
                     (intlv_en != (0x03 << 8)) &&
                     (intlv_en != (0x07 << 8)))) {
                amd64_printk(KERN_WARNING, "junk value of 0x%x extracted from "
                             "IntlvEn field of DRAM Base Register for node 0: "
                             "This probably indicates a BIOS bug.\n", intlv_en);
                return NULL;
        }

        bits = (((u32) sys_addr) >> 12) & intlv_en;

        for (node_id = 0; ; ) {
                if ((pvt->dram_limit[node_id] & intlv_en) == bits)
                        break;  /* intlv_sel field matches */

                if (++node_id >= DRAM_REG_COUNT)
                        goto err_no_match;
        }

        /* sanity test for sys_addr */
        if (unlikely(!amd64_base_limit_match(pvt, sys_addr, node_id))) {
                amd64_printk(KERN_WARNING,
                          "%s(): sys_addr 0x%lx falls outside base/limit "
                          "address range for node %d with node interleaving "
                          "enabled.\n", __func__, (unsigned long)sys_addr,
                          node_id);
                return NULL;
        }

found:
        return edac_mc_find(node_id);

err_no_match:
        debugf2("sys_addr 0x%lx doesn't match any node\n",
                (unsigned long)sys_addr);

        return NULL;
}

/*
 * Extract the DRAM CS base address from selected csrow register.
 */
static u64 base_from_dct_base(struct amd64_pvt *pvt, int csrow)
{
        return ((u64) (amd64_get_dct_base(pvt, 0, csrow) & pvt->dcsb_base)) <<
                                pvt->dcs_shift;
}

/*
 * Extract the mask from the dcsb0[csrow] entry in a CPU revision-specific way.
 */
static u64 mask_from_dct_mask(struct amd64_pvt *pvt, int csrow)
{
        u64 dcsm_bits, other_bits;
        u64 mask;

        /* Extract bits from DRAM CS Mask. */
        dcsm_bits = amd64_get_dct_mask(pvt, 0, csrow) & pvt->dcsm_mask;

        other_bits = pvt->dcsm_mask;
        other_bits = ~(other_bits << pvt->dcs_shift);

        /*
         * The extracted bits from DCSM belong in the spaces represented by
         * the cleared bits in other_bits.
         */
        mask = (dcsm_bits << pvt->dcs_shift) | other_bits;

        return mask;
}

/*
 * @input_addr is an InputAddr associated with the node given by mci. Return the
 * csrow that input_addr maps to, or -1 on failure (no csrow claims input_addr).
 */
static int input_addr_to_csrow(struct mem_ctl_info *mci, u64 input_addr)
{
        struct amd64_pvt *pvt;
        int csrow;
        u64 base, mask;

        pvt = mci->pvt_info;

        /*
         * Here we use the DRAM CS Base and DRAM CS Mask registers. For each CS
         * base/mask register pair, test the condition shown near the start of
         * section 3.5.4 (p. 84, BKDG #26094, K8, revA-E).
         */
        for (csrow = 0; csrow < CHIPSELECT_COUNT; csrow++) {

                /* This DRAM chip select is disabled on this node */
                if ((pvt->dcsb0[csrow] & K8_DCSB_CS_ENABLE) == 0)
                        continue;

                base = base_from_dct_base(pvt, csrow);
                mask = ~mask_from_dct_mask(pvt, csrow);

                if ((input_addr & mask) == (base & mask)) {
                        debugf2("InputAddr 0x%lx matches csrow %d (node %d)\n",
                                (unsigned long)input_addr, csrow,
                                pvt->mc_node_id);

                        return csrow;
                }
        }

        debugf2("no matching csrow for InputAddr 0x%lx (MC node %d)\n",
                (unsigned long)input_addr, pvt->mc_node_id);

        return -1;
}

/*
 * Return the base value defined by the DRAM Base register for the node
 * represented by mci.  This function returns the full 40-bit value despite the
 * fact that the register only stores bits 39-24 of the value. See section
 * 3.4.4.1 (BKDG #26094, K8, revA-E)
 */
static inline u64 get_dram_base(struct mem_ctl_info *mci)
{
        struct amd64_pvt *pvt = mci->pvt_info;

        return pvt->dram_base[pvt->mc_node_id];
}

/*
 * Obtain info from the DRAM Hole Address Register (section 3.4.8, pub #26094)
 * for the node represented by mci. Info is passed back in *hole_base,
 * *hole_offset, and *hole_size.  Function returns 0 if info is valid or 1 if
 * info is invalid. Info may be invalid for either of the following reasons:
 *
 * - The revision of the node is not E or greater.  In this case, the DRAM Hole
 *   Address Register does not exist.
 *
 * - The DramHoleValid bit is cleared in the DRAM Hole Address Register,
 *   indicating that its contents are not valid.
 *
 * The values passed back in *hole_base, *hole_offset, and *hole_size are
 * complete 32-bit values despite the fact that the bitfields in the DHAR
 * only represent bits 31-24 of the base and offset values.
 */
int amd64_get_dram_hole_info(struct mem_ctl_info *mci, u64 *hole_base,
                             u64 *hole_offset, u64 *hole_size)
{
        struct amd64_pvt *pvt = mci->pvt_info;
        u64 base;

        /* only revE and later have the DRAM Hole Address Register */
        if (boot_cpu_data.x86 == 0xf && pvt->ext_model < OPTERON_CPU_REV_E) {
                debugf1("  revision %d for node %d does not support DHAR\n",
                        pvt->ext_model, pvt->mc_node_id);
                return 1;
        }

        /* only valid for Fam10h */
        if (boot_cpu_data.x86 == 0x10 &&
            (pvt->dhar & F10_DRAM_MEM_HOIST_VALID) == 0) {
                debugf1("  Dram Memory Hoisting is DISABLED on this system\n");
                return 1;
        }

        if ((pvt->dhar & DHAR_VALID) == 0) {
                debugf1("  Dram Memory Hoisting is DISABLED on this node %d\n",
                        pvt->mc_node_id);
                return 1;
        }

        /* This node has Memory Hoisting */

        /* +------------------+--------------------+--------------------+-----
         * | memory           | DRAM hole          | relocated          |
         * | [0, (x - 1)]     | [x, 0xffffffff]    | addresses from     |
         * |                  |                    | DRAM hole          |
         * |                  |                    | [0x100000000,      |
         * |                  |                    |  (0x100000000+     |
         * |                  |                    |   (0xffffffff-x))] |
         * +------------------+--------------------+--------------------+-----
         *
         * Above is a diagram of physical memory showing the DRAM hole and the
         * relocated addresses from the DRAM hole.  As shown, the DRAM hole
         * starts at address x (the base address) and extends through address
         * 0xffffffff.  The DRAM Hole Address Register (DHAR) relocates the
         * addresses in the hole so that they start at 0x100000000.
         */

        base = dhar_base(pvt->dhar);

        *hole_base = base;
        *hole_size = (0x1ull << 32) - base;

        if (boot_cpu_data.x86 > 0xf)
                *hole_offset = f10_dhar_offset(pvt->dhar);
        else
                *hole_offset = k8_dhar_offset(pvt->dhar);

        debugf1("  DHAR info for node %d base 0x%lx offset 0x%lx size 0x%lx\n",
                pvt->mc_node_id, (unsigned long)*hole_base,
                (unsigned long)*hole_offset, (unsigned long)*hole_size);

        return 0;
}
EXPORT_SYMBOL_GPL(amd64_get_dram_hole_info);

/*
 * Return the DramAddr that the SysAddr given by @sys_addr maps to.  It is
 * assumed that sys_addr maps to the node given by mci.
 *
 * The first part of section 3.4.4 (p. 70) shows how the DRAM Base (section
 * 3.4.4.1) and DRAM Limit (section 3.4.4.2) registers are used to translate a
 * SysAddr to a DramAddr. If the DRAM Hole Address Register (DHAR) is enabled,
 * then it is also involved in translating a SysAddr to a DramAddr. Sections
 * 3.4.8 and 3.5.8.2 describe the DHAR and how it is used for memory hoisting.
 * These parts of the documentation are unclear. I interpret them as follows:
 *
 * When node n receives a SysAddr, it processes the SysAddr as follows:
 *
 * 1. It extracts the DRAMBase and DRAMLimit values from the DRAM Base and DRAM
 *    Limit registers for node n. If the SysAddr is not within the range
 *    specified by the base and limit values, then node n ignores the Sysaddr
 *    (since it does not map to node n). Otherwise continue to step 2 below.
 *
 * 2. If the DramHoleValid bit of the DHAR for node n is clear, the DHAR is
 *    disabled so skip to step 3 below. Otherwise see if the SysAddr is within
 *    the range of relocated addresses (starting at 0x100000000) from the DRAM
 *    hole. If not, skip to step 3 below. Else get the value of the
 *    DramHoleOffset field from the DHAR. To obtain the DramAddr, subtract the
 *    offset defined by this value from the SysAddr.
 *
 * 3. Obtain the base address for node n from the DRAMBase field of the DRAM
 *    Base register for node n. To obtain the DramAddr, subtract the base
 *    address from the SysAddr, as shown near the start of section 3.4.4 (p.70).
 */
static u64 sys_addr_to_dram_addr(struct mem_ctl_info *mci, u64 sys_addr)
{
        u64 dram_base, hole_base, hole_offset, hole_size, dram_addr;
        int ret = 0;

        dram_base = get_dram_base(mci);

        ret = amd64_get_dram_hole_info(mci, &hole_base, &hole_offset,
                                      &hole_size);
        if (!ret) {
                if ((sys_addr >= (1ull << 32)) &&
                    (sys_addr < ((1ull << 32) + hole_size))) {
                        /* use DHAR to translate SysAddr to DramAddr */
                        dram_addr = sys_addr - hole_offset;

                        debugf2("using DHAR to translate SysAddr 0x%lx to "
                                "DramAddr 0x%lx\n",
                                (unsigned long)sys_addr,
                                (unsigned long)dram_addr);

                        return dram_addr;
                }
        }

        /*
         * Translate the SysAddr to a DramAddr as shown near the start of
         * section 3.4.4 (p. 70).  Although sys_addr is a 64-bit value, the k8
         * only deals with 40-bit values.  Therefore we discard bits 63-40 of
         * sys_addr below.  If bit 39 of sys_addr is 1 then the bits we
         * discard are all 1s.  Otherwise the bits we discard are all 0s.  See
         * section 3.4.2 of AMD publication 24592: AMD x86-64 Architecture
         * Programmer's Manual Volume 1 Application Programming.
         */
        dram_addr = (sys_addr & 0xffffffffffull) - dram_base;

        debugf2("using DRAM Base register to translate SysAddr 0x%lx to "
                "DramAddr 0x%lx\n", (unsigned long)sys_addr,
                (unsigned long)dram_addr);
        return dram_addr;
}

/*
 * @intlv_en is the value of the IntlvEn field from a DRAM Base register
 * (section 3.4.4.1).  Return the number of bits from a SysAddr that are used
 * for node interleaving.
 */
static int num_node_interleave_bits(unsigned intlv_en)
{
        static const int intlv_shift_table[] = { 0, 1, 0, 2, 0, 0, 0, 3 };
        int n;

        BUG_ON(intlv_en > 7);
        n = intlv_shift_table[intlv_en];
        return n;
}

/* Translate the DramAddr given by @dram_addr to an InputAddr. */
static u64 dram_addr_to_input_addr(struct mem_ctl_info *mci, u64 dram_addr)
{
        struct amd64_pvt *pvt;
        int intlv_shift;
        u64 input_addr;

        pvt = mci->pvt_info;

        /*
         * See the start of section 3.4.4 (p. 70, BKDG #26094, K8, revA-E)
         * concerning translating a DramAddr to an InputAddr.
         */
        intlv_shift = num_node_interleave_bits(pvt->dram_IntlvEn[0]);
        input_addr = ((dram_addr >> intlv_shift) & 0xffffff000ull) +
            (dram_addr & 0xfff);

        debugf2("  Intlv Shift=%d DramAddr=0x%lx maps to InputAddr=0x%lx\n",
                intlv_shift, (unsigned long)dram_addr,
                (unsigned long)input_addr);

        return input_addr;
}

/*
 * Translate the SysAddr represented by @sys_addr to an InputAddr.  It is
 * assumed that @sys_addr maps to the node given by mci.
 */
static u64 sys_addr_to_input_addr(struct mem_ctl_info *mci, u64 sys_addr)
{
        u64 input_addr;

        input_addr =
            dram_addr_to_input_addr(mci, sys_addr_to_dram_addr(mci, sys_addr));

        debugf2("SysAdddr 0x%lx translates to InputAddr 0x%lx\n",
                (unsigned long)sys_addr, (unsigned long)input_addr);

        return input_addr;
}


/*
 * @input_addr is an InputAddr associated with the node represented by mci.
 * Translate @input_addr to a DramAddr and return the result.
 */
static u64 input_addr_to_dram_addr(struct mem_ctl_info *mci, u64 input_addr)
{
        struct amd64_pvt *pvt;
        int node_id, intlv_shift;
        u64 bits, dram_addr;
        u32 intlv_sel;

        /*
         * Near the start of section 3.4.4 (p. 70, BKDG #26094, K8, revA-E)
         * shows how to translate a DramAddr to an InputAddr. Here we reverse
         * this procedure. When translating from a DramAddr to an InputAddr, the
         * bits used for node interleaving are discarded.  Here we recover these
         * bits from the IntlvSel field of the DRAM Limit register (section
         * 3.4.4.2) for the node that input_addr is associated with.
         */
        pvt = mci->pvt_info;
        node_id = pvt->mc_node_id;
        BUG_ON((node_id < 0) || (node_id > 7));

        intlv_shift = num_node_interleave_bits(pvt->dram_IntlvEn[0]);

        if (intlv_shift == 0) {
                debugf1("    InputAddr 0x%lx translates to DramAddr of "
                        "same value\n", (unsigned long)input_addr);

                return input_addr;
        }

        bits = ((input_addr & 0xffffff000ull) << intlv_shift) +
            (input_addr & 0xfff);

        intlv_sel = pvt->dram_IntlvSel[node_id] & ((1 << intlv_shift) - 1);
        dram_addr = bits + (intlv_sel << 12);

        debugf1("InputAddr 0x%lx translates to DramAddr 0x%lx "
                "(%d node interleave bits)\n", (unsigned long)input_addr,
                (unsigned long)dram_addr, intlv_shift);

        return dram_addr;
}

/*
 * @dram_addr is a DramAddr that maps to the node represented by mci. Convert
 * @dram_addr to a SysAddr.
 */
static u64 dram_addr_to_sys_addr(struct mem_ctl_info *mci, u64 dram_addr)
{
        struct amd64_pvt *pvt = mci->pvt_info;
        u64 hole_base, hole_offset, hole_size, base, limit, sys_addr;
        int ret = 0;

        ret = amd64_get_dram_hole_info(mci, &hole_base, &hole_offset,
                                      &hole_size);
        if (!ret) {
                if ((dram_addr >= hole_base) &&
                    (dram_addr < (hole_base + hole_size))) {
                        sys_addr = dram_addr + hole_offset;

                        debugf1("using DHAR to translate DramAddr 0x%lx to "
                                "SysAddr 0x%lx\n", (unsigned long)dram_addr,
                                (unsigned long)sys_addr);

                        return sys_addr;
                }
        }

        amd64_get_base_and_limit(pvt, pvt->mc_node_id, &base, &limit);
        sys_addr = dram_addr + base;

        /*
         * The sys_addr we have computed up to this point is a 40-bit value
         * because the k8 deals with 40-bit values.  However, the value we are
         * supposed to return is a full 64-bit physical address.  The AMD
         * x86-64 architecture specifies that the most significant implemented
         * address bit through bit 63 of a physical address must be either all
         * 0s or all 1s.  Therefore we sign-extend the 40-bit sys_addr to a
         * 64-bit value below.  See section 3.4.2 of AMD publication 24592:
         * AMD x86-64 Architecture Programmer's Manual Volume 1 Application
         * Programming.
         */
        sys_addr |= ~((sys_addr & (1ull << 39)) - 1);

        debugf1("    Node %d, DramAddr 0x%lx to SysAddr 0x%lx\n",
                pvt->mc_node_id, (unsigned long)dram_addr,
                (unsigned long)sys_addr);

        return sys_addr;
}

/*
 * @input_addr is an InputAddr associated with the node given by mci. Translate
 * @input_addr to a SysAddr.
 */
static inline u64 input_addr_to_sys_addr(struct mem_ctl_info *mci,
                                         u64 input_addr)
{
        return dram_addr_to_sys_addr(mci,
                                     input_addr_to_dram_addr(mci, input_addr));
}

/*
 * Find the minimum and maximum InputAddr values that map to the given @csrow.
 * Pass back these values in *input_addr_min and *input_addr_max.
 */
static void find_csrow_limits(struct mem_ctl_info *mci, int csrow,
                              u64 *input_addr_min, u64 *input_addr_max)
{
        struct amd64_pvt *pvt;
        u64 base, mask;

        pvt = mci->pvt_info;
        BUG_ON((csrow < 0) || (csrow >= CHIPSELECT_COUNT));

        base = base_from_dct_base(pvt, csrow);
        mask = mask_from_dct_mask(pvt, csrow);

        *input_addr_min = base & ~mask;
        *input_addr_max = base | mask | pvt->dcs_mask_notused;
}

/*
 * Extract error address from MCA NB Address Low (section 3.6.4.5) and MCA NB
 * Address High (section 3.6.4.6) register values and return the result. Address
 * is located in the info structure (nbeah and nbeal), the encoding is device
 * specific.
 */
static u64 extract_error_address(struct mem_ctl_info *mci,
                                 struct amd64_error_info_regs *info)
{
        struct amd64_pvt *pvt = mci->pvt_info;

        return pvt->ops->get_error_address(mci, info);
}


/* Map the Error address to a PAGE and PAGE OFFSET. */
static inline void error_address_to_page_and_offset(u64 error_address,
                                                    u32 *page, u32 *offset)
{
        *page = (u32) (error_address >> PAGE_SHIFT);
        *offset = ((u32) error_address) & ~PAGE_MASK;
}

/*
 * @sys_addr is an error address (a SysAddr) extracted from the MCA NB Address
 * Low (section 3.6.4.5) and MCA NB Address High (section 3.6.4.6) registers
 * of a node that detected an ECC memory error.  mci represents the node that
 * the error address maps to (possibly different from the node that detected
 * the error).  Return the number of the csrow that sys_addr maps to, or -1 on
 * error.
 */
static int sys_addr_to_csrow(struct mem_ctl_info *mci, u64 sys_addr)
{
        int csrow;

        csrow = input_addr_to_csrow(mci, sys_addr_to_input_addr(mci, sys_addr));

        if (csrow == -1)
                amd64_mc_printk(mci, KERN_ERR,
                             "Failed to translate InputAddr to csrow for "
                             "address 0x%lx\n", (unsigned long)sys_addr);
        return csrow;
}

static int get_channel_from_ecc_syndrome(unsigned short syndrome);

static void amd64_cpu_display_info(struct amd64_pvt *pvt)
{
        if (boot_cpu_data.x86 == 0x11)
                edac_printk(KERN_DEBUG, EDAC_MC, "F11h CPU detected\n");
        else if (boot_cpu_data.x86 == 0x10)
                edac_printk(KERN_DEBUG, EDAC_MC, "F10h CPU detected\n");
        else if (boot_cpu_data.x86 == 0xf)
                edac_printk(KERN_DEBUG, EDAC_MC, "%s detected\n",
                        (pvt->ext_model >= OPTERON_CPU_REV_F) ?
                        "Rev F or later" : "Rev E or earlier");
        else
                /* we'll hardly ever ever get here */
                edac_printk(KERN_ERR, EDAC_MC, "Unknown cpu!\n");
}

/*
 * Determine if the DIMMs have ECC enabled. ECC is enabled ONLY if all the DIMMs
 * are ECC capable.
 */
static enum edac_type amd64_determine_edac_cap(struct amd64_pvt *pvt)
{
        int bit;
        enum dev_type edac_cap = EDAC_NONE;

        bit = (boot_cpu_data.x86 > 0xf || pvt->ext_model >= OPTERON_CPU_REV_F)
                ? 19
                : 17;

        if (pvt->dclr0 >> BIT(bit))
                edac_cap = EDAC_FLAG_SECDED;

        return edac_cap;
}


static void f10_debug_display_dimm_sizes(int ctrl, struct amd64_pvt *pvt,
                                         int ganged);

/* Display and decode various NB registers for debug purposes. */
static void amd64_dump_misc_regs(struct amd64_pvt *pvt)
{
        int ganged;

        debugf1("  nbcap:0x%8.08x DctDualCap=%s DualNode=%s 8-Node=%s\n",
                pvt->nbcap,
                (pvt->nbcap & K8_NBCAP_DCT_DUAL) ? "True" : "False",
                (pvt->nbcap & K8_NBCAP_DUAL_NODE) ? "True" : "False",
                (pvt->nbcap & K8_NBCAP_8_NODE) ? "True" : "False");
        debugf1("    ECC Capable=%s   ChipKill Capable=%s\n",
                (pvt->nbcap & K8_NBCAP_SECDED) ? "True" : "False",
                (pvt->nbcap & K8_NBCAP_CHIPKILL) ? "True" : "False");
        debugf1("  DramCfg0-low=0x%08x DIMM-ECC=%s Parity=%s Width=%s\n",
                pvt->dclr0,
                (pvt->dclr0 & BIT(19)) ?  "Enabled" : "Disabled",
                (pvt->dclr0 & BIT(8)) ?  "Enabled" : "Disabled",
                (pvt->dclr0 & BIT(11)) ?  "128b" : "64b");
        debugf1("    DIMM x4 Present: L0=%s L1=%s L2=%s L3=%s  DIMM Type=%s\n",
                (pvt->dclr0 & BIT(12)) ?  "Y" : "N",
                (pvt->dclr0 & BIT(13)) ?  "Y" : "N",
                (pvt->dclr0 & BIT(14)) ?  "Y" : "N",
                (pvt->dclr0 & BIT(15)) ?  "Y" : "N",
                (pvt->dclr0 & BIT(16)) ?  "UN-Buffered" : "Buffered");


        debugf1("  online-spare: 0x%8.08x\n", pvt->online_spare);

        if (boot_cpu_data.x86 == 0xf) {
                debugf1("  dhar: 0x%8.08x Base=0x%08x Offset=0x%08x\n",
                        pvt->dhar, dhar_base(pvt->dhar),
                        k8_dhar_offset(pvt->dhar));
                debugf1("      DramHoleValid=%s\n",
                        (pvt->dhar & DHAR_VALID) ?  "True" : "False");

                debugf1("  dbam-dkt: 0x%8.08x\n", pvt->dbam0);

                /* everything below this point is Fam10h and above */
                return;

        } else {
                debugf1("  dhar: 0x%8.08x Base=0x%08x Offset=0x%08x\n",
                        pvt->dhar, dhar_base(pvt->dhar),
                        f10_dhar_offset(pvt->dhar));
                debugf1("    DramMemHoistValid=%s DramHoleValid=%s\n",
                        (pvt->dhar & F10_DRAM_MEM_HOIST_VALID) ?
                        "True" : "False",
                        (pvt->dhar & DHAR_VALID) ?
                        "True" : "False");
        }

        /* Only if NOT ganged does dcl1 have valid info */
        if (!dct_ganging_enabled(pvt)) {
                debugf1("  DramCfg1-low=0x%08x DIMM-ECC=%s Parity=%s "
                        "Width=%s\n", pvt->dclr1,
                        (pvt->dclr1 & BIT(19)) ?  "Enabled" : "Disabled",
                        (pvt->dclr1 & BIT(8)) ?  "Enabled" : "Disabled",
                        (pvt->dclr1 & BIT(11)) ?  "128b" : "64b");
                debugf1("    DIMM x4 Present: L0=%s L1=%s L2=%s L3=%s  "
                        "DIMM Type=%s\n",
                        (pvt->dclr1 & BIT(12)) ?  "Y" : "N",
                        (pvt->dclr1 & BIT(13)) ?  "Y" : "N",
                        (pvt->dclr1 & BIT(14)) ?  "Y" : "N",
                        (pvt->dclr1 & BIT(15)) ?  "Y" : "N",
                        (pvt->dclr1 & BIT(16)) ?  "UN-Buffered" : "Buffered");
        }

        /*
         * Determine if ganged and then dump memory sizes for first controller,
         * and if NOT ganged dump info for 2nd controller.
         */
        ganged = dct_ganging_enabled(pvt);

        f10_debug_display_dimm_sizes(0, pvt, ganged);

        if (!ganged)
                f10_debug_display_dimm_sizes(1, pvt, ganged);
}

/* Read in both of DBAM registers */
static void amd64_read_dbam_reg(struct amd64_pvt *pvt)
{
        int err = 0;
        unsigned int reg;

        reg = DBAM0;
        err = pci_read_config_dword(pvt->dram_f2_ctl, reg, &pvt->dbam0);
        if (err)
                goto err_reg;

        if (boot_cpu_data.x86 >= 0x10) {
                reg = DBAM1;
                err = pci_read_config_dword(pvt->dram_f2_ctl, reg, &pvt->dbam1);

                if (err)
                        goto err_reg;
        }

err_reg:
        debugf0("Error reading F2x%03x.\n", reg);
}

/*
 * NOTE: CPU Revision Dependent code: Rev E and Rev F
 *
 * Set the DCSB and DCSM mask values depending on the CPU revision value. Also
 * set the shift factor for the DCSB and DCSM values.
 *
 * ->dcs_mask_notused, RevE:
 *
 * To find the max InputAddr for the csrow, start with the base address and set
 * all bits that are "don't care" bits in the test at the start of section
 * 3.5.4 (p. 84).
 *
 * The "don't care" bits are all set bits in the mask and all bits in the gaps
 * between bit ranges [35:25] and [19:13]. The value REV_E_DCS_NOTUSED_BITS
 * represents bits [24:20] and [12:0], which are all bits in the above-mentioned
 * gaps.
 *
 * ->dcs_mask_notused, RevF and later:
 *
 * To find the max InputAddr for the csrow, start with the base address and set
 * all bits that are "don't care" bits in the test at the start of NPT section
 * 4.5.4 (p. 87).
 *
 * The "don't care" bits are all set bits in the mask and all bits in the gaps
 * between bit ranges [36:27] and [21:13].
 *
 * The value REV_F_F1Xh_DCS_NOTUSED_BITS represents bits [26:22] and [12:0],
 * which are all bits in the above-mentioned gaps.
 */
static void amd64_set_dct_base_and_mask(struct amd64_pvt *pvt)
{
        if (pvt->ext_model >= OPTERON_CPU_REV_F) {
                pvt->dcsb_base          = REV_F_F1Xh_DCSB_BASE_BITS;
                pvt->dcsm_mask          = REV_F_F1Xh_DCSM_MASK_BITS;
                pvt->dcs_mask_notused   = REV_F_F1Xh_DCS_NOTUSED_BITS;
                pvt->dcs_shift          = REV_F_F1Xh_DCS_SHIFT;

                switch (boot_cpu_data.x86) {
                case 0xf:
                        pvt->num_dcsm = REV_F_DCSM_COUNT;
                        break;

                case 0x10:
                        pvt->num_dcsm = F10_DCSM_COUNT;
                        break;

                case 0x11:
                        pvt->num_dcsm = F11_DCSM_COUNT;
                        break;

                default:
                        amd64_printk(KERN_ERR, "Unsupported family!\n");
                        break;
                }
        } else {
                pvt->dcsb_base          = REV_E_DCSB_BASE_BITS;
                pvt->dcsm_mask          = REV_E_DCSM_MASK_BITS;
                pvt->dcs_mask_notused   = REV_E_DCS_NOTUSED_BITS;
                pvt->dcs_shift          = REV_E_DCS_SHIFT;
                pvt->num_dcsm           = REV_E_DCSM_COUNT;
        }
}

/*
 * Function 2 Offset F10_DCSB0; read in the DCS Base and DCS Mask hw registers
 */
static void amd64_read_dct_base_mask(struct amd64_pvt *pvt)
{
        int cs, reg, err = 0;

        amd64_set_dct_base_and_mask(pvt);

        for (cs = 0; cs < CHIPSELECT_COUNT; cs++) {
                reg = K8_DCSB0 + (cs * 4);
                err = pci_read_config_dword(pvt->dram_f2_ctl, reg,
                                                &pvt->dcsb0[cs]);
                if (unlikely(err))
                        debugf0("Reading K8_DCSB0[%d] failed\n", cs);
                else
                        debugf0("  DCSB0[%d]=0x%08x reg: F2x%x\n",
                                cs, pvt->dcsb0[cs], reg);

                /* If DCT are NOT ganged, then read in DCT1's base */
                if (boot_cpu_data.x86 >= 0x10 && !dct_ganging_enabled(pvt)) {
                        reg = F10_DCSB1 + (cs * 4);
                        err = pci_read_config_dword(pvt->dram_f2_ctl, reg,
                                                        &pvt->dcsb1[cs]);
                        if (unlikely(err))
                                debugf0("Reading F10_DCSB1[%d] failed\n", cs);
                        else
                                debugf0("  DCSB1[%d]=0x%08x reg: F2x%x\n",
                                        cs, pvt->dcsb1[cs], reg);
                } else {
                        pvt->dcsb1[cs] = 0;
                }
        }

        for (cs = 0; cs < pvt->num_dcsm; cs++) {
                reg = K8_DCSB0 + (cs * 4);
                err = pci_read_config_dword(pvt->dram_f2_ctl, reg,
                                        &pvt->dcsm0[cs]);
                if (unlikely(err))
                        debugf0("Reading K8_DCSM0 failed\n");
                else
                        debugf0("    DCSM0[%d]=0x%08x reg: F2x%x\n",
                                cs, pvt->dcsm0[cs], reg);

                /* If DCT are NOT ganged, then read in DCT1's mask */
                if (boot_cpu_data.x86 >= 0x10 && !dct_ganging_enabled(pvt)) {
                        reg = F10_DCSM1 + (cs * 4);
                        err = pci_read_config_dword(pvt->dram_f2_ctl, reg,
                                        &pvt->dcsm1[cs]);
                        if (unlikely(err))
                                debugf0("Reading F10_DCSM1[%d] failed\n", cs);
                        else
                                debugf0("    DCSM1[%d]=0x%08x reg: F2x%x\n",
                                        cs, pvt->dcsm1[cs], reg);
                } else
                        pvt->dcsm1[cs] = 0;
        }
}

static enum mem_type amd64_determine_memory_type(struct amd64_pvt *pvt)
{
        enum mem_type type;

        if (boot_cpu_data.x86 >= 0x10 || pvt->ext_model >= OPTERON_CPU_REV_F) {
                /* Rev F and later */
                type = (pvt->dclr0 & BIT(16)) ? MEM_DDR2 : MEM_RDDR2;
        } else {
                /* Rev E and earlier */
                type = (pvt->dclr0 & BIT(18)) ? MEM_DDR : MEM_RDDR;
        }

        debugf1("  Memory type is: %s\n",
                (type == MEM_DDR2) ? "MEM_DDR2" :
                (type == MEM_RDDR2) ? "MEM_RDDR2" :
                (type == MEM_DDR) ? "MEM_DDR" : "MEM_RDDR");

        return type;
}

/*
 * Read the DRAM Configuration Low register. It differs between CG, D & E revs
 * and the later RevF memory controllers (DDR vs DDR2)
 *
 * Return:
 *      number of memory channels in operation
 * Pass back:
 *      contents of the DCL0_LOW register
 */
static int k8_early_channel_count(struct amd64_pvt *pvt)
{
        int flag, err = 0;

        err = pci_read_config_dword(pvt->dram_f2_ctl, F10_DCLR_0, &pvt->dclr0);
        if (err)
                return err;

        if ((boot_cpu_data.x86_model >> 4) >= OPTERON_CPU_REV_F) {
                /* RevF (NPT) and later */
                flag = pvt->dclr0 & F10_WIDTH_128;
        } else {
                /* RevE and earlier */
                flag = pvt->dclr0 & REVE_WIDTH_128;
        }

        /* not used */
        pvt->dclr1 = 0;

        return (flag) ? 2 : 1;
}

/* extract the ERROR ADDRESS for the K8 CPUs */
static u64 k8_get_error_address(struct mem_ctl_info *mci,
                                struct amd64_error_info_regs *info)
{
        return (((u64) (info->nbeah & 0xff)) << 32) +
                        (info->nbeal & ~0x03);
}

/*
 * Read the Base and Limit registers for K8 based Memory controllers; extract
 * fields from the 'raw' reg into separate data fields
 *
 * Isolates: BASE, LIMIT, IntlvEn, IntlvSel, RW_EN
 */
static void k8_read_dram_base_limit(struct amd64_pvt *pvt, int dram)
{
        u32 low;
        u32 off = dram << 3;    /* 8 bytes between DRAM entries */
        int err;

        err = pci_read_config_dword(pvt->addr_f1_ctl,
                                    K8_DRAM_BASE_LOW + off, &low);
        if (err)
                debugf0("Reading K8_DRAM_BASE_LOW failed\n");

        /* Extract parts into separate data entries */
        pvt->dram_base[dram] = ((u64) low & 0xFFFF0000) << 8;
        pvt->dram_IntlvEn[dram] = (low >> 8) & 0x7;
        pvt->dram_rw_en[dram] = (low & 0x3);

        err = pci_read_config_dword(pvt->addr_f1_ctl,
                                    K8_DRAM_LIMIT_LOW + off, &low);
        if (err)
                debugf0("Reading K8_DRAM_LIMIT_LOW failed\n");

        /*
         * Extract parts into separate data entries. Limit is the HIGHEST memory
         * location of the region, so lower 24 bits need to be all ones
         */
        pvt->dram_limit[dram] = (((u64) low & 0xFFFF0000) << 8) | 0x00FFFFFF;
        pvt->dram_IntlvSel[dram] = (low >> 8) & 0x7;
        pvt->dram_DstNode[dram] = (low & 0x7);
}

static void k8_map_sysaddr_to_csrow(struct mem_ctl_info *mci,
                                        struct amd64_error_info_regs *info,
                                        u64 SystemAddress)
{
        struct mem_ctl_info *src_mci;
        unsigned short syndrome;
        int channel, csrow;
        u32 page, offset;

        /* Extract the syndrome parts and form a 16-bit syndrome */
        syndrome = EXTRACT_HIGH_SYNDROME(info->nbsl) << 8;
        syndrome |= EXTRACT_LOW_SYNDROME(info->nbsh);

        /* CHIPKILL enabled */
        if (info->nbcfg & K8_NBCFG_CHIPKILL) {
                channel = get_channel_from_ecc_syndrome(syndrome);
                if (channel < 0) {
                        /*
                         * Syndrome didn't map, so we don't know which of the
                         * 2 DIMMs is in error. So we need to ID 'both' of them
                         * as suspect.
                         */
                        amd64_mc_printk(mci, KERN_WARNING,
                                       "unknown syndrome 0x%x - possible error "
                                       "reporting race\n", syndrome);
                        edac_mc_handle_ce_no_info(mci, EDAC_MOD_STR);
                        return;
                }
        } else {
                /*
                 * non-chipkill ecc mode
                 *
                 * The k8 documentation is unclear about how to determine the
                 * channel number when using non-chipkill memory.  This method
                 * was obtained from email communication with someone at AMD.
                 * (Wish the email was placed in this comment - norsk)
                 */
                channel = ((SystemAddress & BIT(3)) != 0);
        }

        /*
         * Find out which node the error address belongs to. This may be
         * different from the node that detected the error.
         */
        src_mci = find_mc_by_sys_addr(mci, SystemAddress);
        if (src_mci) {
                amd64_mc_printk(mci, KERN_ERR,
                             "failed to map error address 0x%lx to a node\n",
                             (unsigned long)SystemAddress);
                edac_mc_handle_ce_no_info(mci, EDAC_MOD_STR);
                return;
        }

        /* Now map the SystemAddress to a CSROW */
        csrow = sys_addr_to_csrow(src_mci, SystemAddress);
        if (csrow < 0) {
                edac_mc_handle_ce_no_info(src_mci, EDAC_MOD_STR);
        } else {
                error_address_to_page_and_offset(SystemAddress, &page, &offset);

                edac_mc_handle_ce(src_mci, page, offset, syndrome, csrow,
                                  channel, EDAC_MOD_STR);
        }
}

/*
 * determrine the number of PAGES in for this DIMM's size based on its DRAM
 * Address Mapping.
 *
 * First step is to calc the number of bits to shift a value of 1 left to
 * indicate show many pages. Start with the DBAM value as the starting bits,
 * then proceed to adjust those shift bits, based on CPU rev and the table.
 * See BKDG on the DBAM
 */
static int k8_dbam_map_to_pages(struct amd64_pvt *pvt, int dram_map)
{
        int nr_pages;

        if (pvt->ext_model >= OPTERON_CPU_REV_F) {
                nr_pages = 1 << (revf_quad_ddr2_shift[dram_map] - PAGE_SHIFT);
        } else {
                /*
                 * RevE and less section; this line is tricky. It collapses the
                 * table used by RevD and later to one that matches revisions CG
                 * and earlier.
                 */
                dram_map -= (pvt->ext_model >= OPTERON_CPU_REV_D) ?
                                (dram_map > 8 ? 4 : (dram_map > 5 ?
                                3 : (dram_map > 2 ? 1 : 0))) : 0;

                /* 25 shift is 32MiB minimum DIMM size in RevE and prior */
                nr_pages = 1 << (dram_map + 25 - PAGE_SHIFT);
        }

        return nr_pages;
}

/*
 * Get the number of DCT channels in use.
 *
 * Return:
 *      number of Memory Channels in operation
 * Pass back:
 *      contents of the DCL0_LOW register
 */
static int f10_early_channel_count(struct amd64_pvt *pvt)
{
        int err = 0, channels = 0;
        u32 dbam;

        err = pci_read_config_dword(pvt->dram_f2_ctl, F10_DCLR_0, &pvt->dclr0);
        if (err)
                goto err_reg;

        err = pci_read_config_dword(pvt->dram_f2_ctl, F10_DCLR_1, &pvt->dclr1);
        if (err)
                goto err_reg;

        /* If we are in 128 bit mode, then we are using 2 channels */
        if (pvt->dclr0 & F10_WIDTH_128) {
                debugf0("Data WIDTH is 128 bits - 2 channels\n");
                channels = 2;
                return channels;
        }

        /*
         * Need to check if in UN-ganged mode: In such, there are 2 channels,
         * but they are NOT in 128 bit mode and thus the above 'dcl0' status bit
         * will be OFF.
         *
         * Need to check DCT0[0] and DCT1[0] to see if only one of them has
         * their CSEnable bit on. If so, then SINGLE DIMM case.
         */
        debugf0("Data WIDTH is NOT 128 bits - need more decoding\n");

        /*
         * Check DRAM Bank Address Mapping values for each DIMM to see if there
         * is more than just one DIMM present in unganged mode. Need to check
         * both controllers since DIMMs can be placed in either one.
         */
        channels = 0;
        err = pci_read_config_dword(pvt->dram_f2_ctl, DBAM0, &dbam);
        if (err)
                goto err_reg;

        if (DBAM_DIMM(0, dbam) > 0)
                channels++;
        if (DBAM_DIMM(1, dbam) > 0)
                channels++;
        if (DBAM_DIMM(2, dbam) > 0)
                channels++;
        if (DBAM_DIMM(3, dbam) > 0)
                channels++;

        /* If more than 2 DIMMs are present, then we have 2 channels */
        if (channels > 2)
                channels = 2;
        else if (channels == 0) {
                /* No DIMMs on DCT0, so look at DCT1 */
                err = pci_read_config_dword(pvt->dram_f2_ctl, DBAM1, &dbam);
                if (err)
                        goto err_reg;

                if (DBAM_DIMM(0, dbam) > 0)
                        channels++;
                if (DBAM_DIMM(1, dbam) > 0)
                        channels++;
                if (DBAM_DIMM(2, dbam) > 0)
                        channels++;
                if (DBAM_DIMM(3, dbam) > 0)
                        channels++;

                if (channels > 2)
                        channels = 2;
        }

        /* If we found ALL 0 values, then assume just ONE DIMM-ONE Channel */
        if (channels == 0)
                channels = 1;

        debugf0("DIMM count= %d\n", channels);

        return channels;

err_reg:
        return -1;

}

static int f10_dbam_map_to_pages(struct amd64_pvt *pvt, int dram_map)
{
        return 1 << (revf_quad_ddr2_shift[dram_map] - PAGE_SHIFT);
}

/* Enable extended configuration access via 0xCF8 feature */
static void amd64_setup(struct amd64_pvt *pvt)
{
        u32 reg;

        pci_read_config_dword(pvt->misc_f3_ctl, F10_NB_CFG_HIGH, &reg);

        pvt->flags.cf8_extcfg = !!(reg & F10_NB_CFG_LOW_ENABLE_EXT_CFG);
        reg |= F10_NB_CFG_LOW_ENABLE_EXT_CFG;
        pci_write_config_dword(pvt->misc_f3_ctl, F10_NB_CFG_HIGH, reg);
}

/* Restore the extended configuration access via 0xCF8 feature */
static void amd64_teardown(struct amd64_pvt *pvt)
{
        u32 reg;

        pci_read_config_dword(pvt->misc_f3_ctl, F10_NB_CFG_HIGH, &reg);

        reg &= ~F10_NB_CFG_LOW_ENABLE_EXT_CFG;
        if (pvt->flags.cf8_extcfg)
                reg |= F10_NB_CFG_LOW_ENABLE_EXT_CFG;
        pci_write_config_dword(pvt->misc_f3_ctl, F10_NB_CFG_HIGH, reg);
}

static u64 f10_get_error_address(struct mem_ctl_info *mci,
                        struct amd64_error_info_regs *info)
{
        return (((u64) (info->nbeah & 0xffff)) << 32) +
                        (info->nbeal & ~0x01);
}

/*
 * Read the Base and Limit registers for F10 based Memory controllers. Extract
 * fields from the 'raw' reg into separate data fields.
 *
 * Isolates: BASE, LIMIT, IntlvEn, IntlvSel, RW_EN.
 */
static void f10_read_dram_base_limit(struct amd64_pvt *pvt, int dram)
{
        u32 high_offset, low_offset, high_base, low_base, high_limit, low_limit;

        low_offset = K8_DRAM_BASE_LOW + (dram << 3);
        high_offset = F10_DRAM_BASE_HIGH + (dram << 3);

        /* read the 'raw' DRAM BASE Address register */
        pci_read_config_dword(pvt->addr_f1_ctl, low_offset, &low_base);

        /* Read from the ECS data register */
        pci_read_config_dword(pvt->addr_f1_ctl, high_offset, &high_base);

        /* Extract parts into separate data entries */
        pvt->dram_rw_en[dram] = (low_base & 0x3);

        if (pvt->dram_rw_en[dram] == 0)
                return;

        pvt->dram_IntlvEn[dram] = (low_base >> 8) & 0x7;

        pvt->dram_base[dram] = (((((u64) high_base & 0x000000FF) << 32) |
                                ((u64) low_base & 0xFFFF0000))) << 8;

        low_offset = K8_DRAM_LIMIT_LOW + (dram << 3);
        high_offset = F10_DRAM_LIMIT_HIGH + (dram << 3);

        /* read the 'raw' LIMIT registers */
        pci_read_config_dword(pvt->addr_f1_ctl, low_offset, &low_limit);

        /* Read from the ECS data register for the HIGH portion */
        pci_read_config_dword(pvt->addr_f1_ctl, high_offset, &high_limit);

        debugf0("  HW Regs: BASE=0x%08x-%08x      LIMIT=  0x%08x-%08x\n",
                high_base, low_base, high_limit, low_limit);

        pvt->dram_DstNode[dram] = (low_limit & 0x7);
        pvt->dram_IntlvSel[dram] = (low_limit >> 8) & 0x7;

        /*
         * Extract address values and form a LIMIT address. Limit is the HIGHEST
         * memory location of the region, so low 24 bits need to be all ones.
         */
        low_limit |= 0x0000FFFF;
        pvt->dram_limit[dram] =
                ((((u64) high_limit << 32) + (u64) low_limit) << 8) | (0xFF);
}

static void f10_read_dram_ctl_register(struct amd64_pvt *pvt)
{
        int err = 0;

        err = pci_read_config_dword(pvt->dram_f2_ctl, F10_DCTL_SEL_LOW,
                                    &pvt->dram_ctl_select_low);
        if (err) {
                debugf0("Reading F10_DCTL_SEL_LOW failed\n");
        } else {
                debugf0("DRAM_DCTL_SEL_LOW=0x%x  DctSelBaseAddr=0x%x\n",
                        pvt->dram_ctl_select_low, dct_sel_baseaddr(pvt));

                debugf0("  DRAM DCTs are=%s DRAM Is=%s DRAM-Ctl-"
                                "sel-hi-range=%s\n",
                        (dct_ganging_enabled(pvt) ? "GANGED" : "NOT GANGED"),
                        (dct_dram_enabled(pvt) ? "Enabled"   : "Disabled"),
                        (dct_high_range_enabled(pvt) ? "Enabled" : "Disabled"));

                debugf0("  DctDatIntLv=%s MemCleared=%s DctSelIntLvAddr=0x%x\n",
                        (dct_data_intlv_enabled(pvt) ? "Enabled" : "Disabled"),
                        (dct_memory_cleared(pvt) ? "True " : "False "),
                        dct_sel_interleave_addr(pvt));
        }

        err = pci_read_config_dword(pvt->dram_f2_ctl, F10_DCTL_SEL_HIGH,
                                    &pvt->dram_ctl_select_high);
        if (err)
                debugf0("Reading F10_DCTL_SEL_HIGH failed\n");
}

/*
 * determine channel based on the interleaving mode: F10h BKDG, 2.8.9 Memory
 * Interleaving Modes.
 */
static u32 f10_determine_channel(struct amd64_pvt *pvt, u64 sys_addr,
                                int hi_range_sel, u32 intlv_en)
{
        u32 cs, temp, dct_sel_high = (pvt->dram_ctl_select_low >> 1) & 1;

        if (dct_ganging_enabled(pvt))
                cs = 0;
        else if (hi_range_sel)
                cs = dct_sel_high;
        else if (dct_interleave_enabled(pvt)) {
                /*
                 * see F2x110[DctSelIntLvAddr] - channel interleave mode
                 */
                if (dct_sel_interleave_addr(pvt) == 0)
                        cs = sys_addr >> 6 & 1;
                else if ((dct_sel_interleave_addr(pvt) >> 1) & 1) {
                        temp = hweight_long((u32) ((sys_addr >> 16) & 0x1F)) % 2;

                        if (dct_sel_interleave_addr(pvt) & 1)
                                cs = (sys_addr >> 9 & 1) ^ temp;
                        else
                                cs = (sys_addr >> 6 & 1) ^ temp;
                } else if (intlv_en & 4)
                        cs = sys_addr >> 15 & 1;
                else if (intlv_en & 2)
                        cs = sys_addr >> 14 & 1;
                else if (intlv_en & 1)
                        cs = sys_addr >> 13 & 1;
                else
                        cs = sys_addr >> 12 & 1;
        } else if (dct_high_range_enabled(pvt) && !dct_ganging_enabled(pvt))
                cs = ~dct_sel_high & 1;
        else
                cs = 0;

        return cs;
}

static inline u32 f10_map_intlv_en_to_shift(u32 intlv_en)
{
        if (intlv_en == 1)
                return 1;
        else if (intlv_en == 3)
                return 2;
        else if (intlv_en == 7)
                return 3;

        return 0;
}

/* See F10h BKDG, 2.8.10.2 DctSelBaseOffset Programming */
static inline u64 f10_get_base_addr_offset(u64 sys_addr, int hi_range_sel,
                                                 u32 dct_sel_base_addr,
                                                 u64 dct_sel_base_off,
                                                 u32 hole_valid, u32 hole_off,
                                                 u64 dram_base)
{
        u64 chan_off;

        if (hi_range_sel) {
                if (!(dct_sel_base_addr & 0xFFFFF800) &&
                   hole_valid && (sys_addr >= 0x100000000ULL))
                        chan_off = hole_off << 16;
                else
                        chan_off = dct_sel_base_off;
        } else {
                if (hole_valid && (sys_addr >= 0x100000000ULL))
                        chan_off = hole_off << 16;
                else
                        chan_off = dram_base & 0xFFFFF8000000ULL;
        }

        return (sys_addr & 0x0000FFFFFFFFFFC0ULL) -
                        (chan_off & 0x0000FFFFFF800000ULL);
}

/* Hack for the time being - Can we get this from BIOS?? */
#define CH0SPARE_RANK   0
#define CH1SPARE_RANK   1

/*
 * checks if the csrow passed in is marked as SPARED, if so returns the new
 * spare row
 */
static inline int f10_process_possible_spare(int csrow,
                                u32 cs, struct amd64_pvt *pvt)
{
        u32 swap_done;
        u32 bad_dram_cs;

        /* Depending on channel, isolate respective SPARING info */
        if (cs) {
                swap_done = F10_ONLINE_SPARE_SWAPDONE1(pvt->online_spare);
                bad_dram_cs = F10_ONLINE_SPARE_BADDRAM_CS1(pvt->online_spare);
                if (swap_done && (csrow == bad_dram_cs))
                        csrow = CH1SPARE_RANK;
        } else {
                swap_done = F10_ONLINE_SPARE_SWAPDONE0(pvt->online_spare);
                bad_dram_cs = F10_ONLINE_SPARE_BADDRAM_CS0(pvt->online_spare);
                if (swap_done && (csrow == bad_dram_cs))
                        csrow = CH0SPARE_RANK;
        }
        return csrow;
}

/*
 * Iterate over the DRAM DCT "base" and "mask" registers looking for a
 * SystemAddr match on the specified 'ChannelSelect' and 'NodeID'
 *
 * Return:
 *      -EINVAL:  NOT FOUND
 *      0..csrow = Chip-Select Row
 */
static int f10_lookup_addr_in_dct(u32 in_addr, u32 nid, u32 cs)
{
        struct mem_ctl_info *mci;
        struct amd64_pvt *pvt;
        u32 cs_base, cs_mask;
        int cs_found = -EINVAL;
        int csrow;

        mci = mci_lookup[nid];
        if (!mci)
                return cs_found;

        pvt = mci->pvt_info;

        debugf1("InputAddr=0x%x  channelselect=%d\n", in_addr, cs);

        for (csrow = 0; csrow < CHIPSELECT_COUNT; csrow++) {

                cs_base = amd64_get_dct_base(pvt, cs, csrow);
                if (!(cs_base & K8_DCSB_CS_ENABLE))
                        continue;

                /*
                 * We have an ENABLED CSROW, Isolate just the MASK bits of the
                 * target: [28:19] and [13:5], which map to [36:27] and [21:13]
                 * of the actual address.
                 */
                cs_base &= REV_F_F1Xh_DCSB_BASE_BITS;

                /*
                 * Get the DCT Mask, and ENABLE the reserved bits: [18:16] and
                 * [4:0] to become ON. Then mask off bits [28:0] ([36:8])
                 */
                cs_mask = amd64_get_dct_mask(pvt, cs, csrow);

                debugf1("    CSROW=%d CSBase=0x%x RAW CSMask=0x%x\n",
                                csrow, cs_base, cs_mask);

                cs_mask = (cs_mask | 0x0007C01F) & 0x1FFFFFFF;

                debugf1("              Final CSMask=0x%x\n", cs_mask);
                debugf1("    (InputAddr & ~CSMask)=0x%x "
                                "(CSBase & ~CSMask)=0x%x\n",
                                (in_addr & ~cs_mask), (cs_base & ~cs_mask));

                if ((in_addr & ~cs_mask) == (cs_base & ~cs_mask)) {
                        cs_found = f10_process_possible_spare(csrow, cs, pvt);

                        debugf1(" MATCH csrow=%d\n", cs_found);
                        break;
                }
        }
        return cs_found;
}

/* For a given @dram_range, check if @sys_addr falls within it. */
static int f10_match_to_this_node(struct amd64_pvt *pvt, int dram_range,
                                  u64 sys_addr, int *nid, int *chan_sel)
{
        int node_id, cs_found = -EINVAL, high_range = 0;
        u32 intlv_en, intlv_sel, intlv_shift, hole_off;
        u32 hole_valid, tmp, dct_sel_base, channel;
        u64 dram_base, chan_addr, dct_sel_base_off;

        dram_base = pvt->dram_base[dram_range];
        intlv_en = pvt->dram_IntlvEn[dram_range];

        node_id = pvt->dram_DstNode[dram_range];
        intlv_sel = pvt->dram_IntlvSel[dram_range];

        debugf1("(dram=%d) Base=0x%llx SystemAddr= 0x%llx Limit=0x%llx\n",
                dram_range, dram_base, sys_addr, pvt->dram_limit[dram_range]);

        /*
         * This assumes that one node's DHAR is the same as all the other
         * nodes' DHAR.
         */
        hole_off = (pvt->dhar & 0x0000FF80);
        hole_valid = (pvt->dhar & 0x1);
        dct_sel_base_off = (pvt->dram_ctl_select_high & 0xFFFFFC00) << 16;

        debugf1("   HoleOffset=0x%x  HoleValid=0x%x IntlvSel=0x%x\n",
                        hole_off, hole_valid, intlv_sel);

        if (intlv_en ||
            (intlv_sel != ((sys_addr >> 12) & intlv_en)))
                return -EINVAL;

        dct_sel_base = dct_sel_baseaddr(pvt);

        /*
         * check whether addresses >= DctSelBaseAddr[47:27] are to be used to
         * select between DCT0 and DCT1.
         */
        if (dct_high_range_enabled(pvt) &&
           !dct_ganging_enabled(pvt) &&
           ((sys_addr >> 27) >= (dct_sel_base >> 11)))
                high_range = 1;

        channel = f10_determine_channel(pvt, sys_addr, high_range, intlv_en);

        chan_addr = f10_get_base_addr_offset(sys_addr, high_range, dct_sel_base,
                                             dct_sel_base_off, hole_valid,
                                             hole_off, dram_base);

        intlv_shift = f10_map_intlv_en_to_shift(intlv_en);

        /* remove Node ID (in case of memory interleaving) */
        tmp = chan_addr & 0xFC0;

        chan_addr = ((chan_addr >> intlv_shift) & 0xFFFFFFFFF000ULL) | tmp;

        /* remove channel interleave and hash */
        if (dct_interleave_enabled(pvt) &&
           !dct_high_range_enabled(pvt) &&
           !dct_ganging_enabled(pvt)) {
                if (dct_sel_interleave_addr(pvt) != 1)
                        chan_addr = (chan_addr >> 1) & 0xFFFFFFFFFFFFFFC0ULL;
                else {
                        tmp = chan_addr & 0xFC0;
                        chan_addr = ((chan_addr & 0xFFFFFFFFFFFFC000ULL) >> 1)
                                        | tmp;
                }
        }

        debugf1("   (ChannelAddrLong=0x%llx) >> 8 becomes InputAddr=0x%x\n",
                chan_addr, (u32)(chan_addr >> 8));

        cs_found = f10_lookup_addr_in_dct(chan_addr >> 8, node_id, channel);

        if (cs_found >= 0) {
                *nid = node_id;
                *chan_sel = channel;
        }
        return cs_found;
}

static int f10_translate_sysaddr_to_cs(struct amd64_pvt *pvt, u64 sys_addr,
                                       int *node, int *chan_sel)
{
        int dram_range, cs_found = -EINVAL;
        u64 dram_base, dram_limit;

        for (dram_range = 0; dram_range < DRAM_REG_COUNT; dram_range++) {

                if (!pvt->dram_rw_en[dram_range])
                        continue;

                dram_base = pvt->dram_base[dram_range];
                dram_limit = pvt->dram_limit[dram_range];

                if ((dram_base <= sys_addr) && (sys_addr <= dram_limit)) {

                        cs_found = f10_match_to_this_node(pvt, dram_range,
                                                          sys_addr, node,
                                                          chan_sel);
                        if (cs_found >= 0)
                                break;
                }
        }
        return cs_found;
}

/*
 * This the F10h reference code from AMD to map a @sys_addr to NodeID,
 * CSROW, Channel.
 *
 * The @sys_addr is usually an error address received from the hardware.
 */
static void f10_map_sysaddr_to_csrow(struct mem_ctl_info *mci,
                                     struct amd64_error_info_regs *info,
                                     u64 sys_addr)
{
        struct amd64_pvt *pvt = mci->pvt_info;
        u32 page, offset;
        unsigned short syndrome;
        int nid, csrow, chan = 0;

        csrow = f10_translate_sysaddr_to_cs(pvt, sys_addr, &nid, &chan);

        if (csrow >= 0) {
                error_address_to_page_and_offset(sys_addr, &page, &offset);

                syndrome = EXTRACT_HIGH_SYNDROME(info->nbsl) << 8;
                syndrome |= EXTRACT_LOW_SYNDROME(info->nbsh);

                /*
                 * Is CHIPKILL on? If so, then we can attempt to use the
                 * syndrome to isolate which channel the error was on.
                 */
                if (pvt->nbcfg & K8_NBCFG_CHIPKILL)
                        chan = get_channel_from_ecc_syndrome(syndrome);

                if (chan >= 0) {
                        edac_mc_handle_ce(mci, page, offset, syndrome,
                                        csrow, chan, EDAC_MOD_STR);
                } else {
                        /*
                         * Channel unknown, report all channels on this
                         * CSROW as failed.
                         */
                        for (chan = 0; chan < mci->csrows[csrow].nr_channels;
                                                                chan++) {
                                        edac_mc_handle_ce(mci, page, offset,
                                                        syndrome,
                                                        csrow, chan,
                                                        EDAC_MOD_STR);
                        }
                }

        } else {
                edac_mc_handle_ce_no_info(mci, EDAC_MOD_STR);
        }
}

/*
 * Input (@index) is the DBAM DIMM value (1 of 4) used as an index into a shift
 * table (revf_quad_ddr2_shift) which starts at 128MB DIMM size. Index of 0
 * indicates an empty DIMM slot, as reported by Hardware on empty slots.
 *
 * Normalize to 128MB by subracting 27 bit shift.
 */
static int map_dbam_to_csrow_size(int index)
{
        int mega_bytes = 0;

        if (index > 0 && index <= DBAM_MAX_VALUE)
                mega_bytes = ((128 << (revf_quad_ddr2_shift[index]-27)));

        return mega_bytes;
}

/*
 * debug routine to display the memory sizes of a DIMM (ganged or not) and it
 * CSROWs as well
 */
static void f10_debug_display_dimm_sizes(int ctrl, struct amd64_pvt *pvt,
                                         int ganged)
{
        int dimm, size0, size1;
        u32 dbam;
        u32 *dcsb;

        debugf1("  dbam%d: 0x%8.08x  CSROW is %s\n", ctrl,
                        ctrl ? pvt->dbam1 : pvt->dbam0,
                        ganged ? "GANGED - dbam1 not used" : "NON-GANGED");

        dbam = ctrl ? pvt->dbam1 : pvt->dbam0;
        dcsb = ctrl ? pvt->dcsb1 : pvt->dcsb0;

        /* Dump memory sizes for DIMM and its CSROWs */
        for (dimm = 0; dimm < 4; dimm++) {

                size0 = 0;
                if (dcsb[dimm*2] & K8_DCSB_CS_ENABLE)
                        size0 = map_dbam_to_csrow_size(DBAM_DIMM(dimm, dbam));

                size1 = 0;
                if (dcsb[dimm*2 + 1] & K8_DCSB_CS_ENABLE)
                        size1 = map_dbam_to_csrow_size(DBAM_DIMM(dimm, dbam));

                debugf1("     CTRL-%d DIMM-%d=%5dMB   CSROW-%d=%5dMB "
                                "CSROW-%d=%5dMB\n",
                                ctrl,
                                dimm,
                                size0 + size1,
                                dimm * 2,
                                size0,
                                dimm * 2 + 1,
                                size1);
        }
}

/*
 * Very early hardware probe on pci_probe thread to determine if this module
 * supports the hardware.
 *
 * Return:
 *      0 for OK
 *      1 for error
 */
static int f10_probe_valid_hardware(struct amd64_pvt *pvt)
{
        int ret = 0;

        /*
         * If we are on a DDR3 machine, we don't know yet if
         * we support that properly at this time
         */
        if ((pvt->dchr0 & F10_DCHR_Ddr3Mode) ||
            (pvt->dchr1 & F10_DCHR_Ddr3Mode)) {

                amd64_printk(KERN_WARNING,
                        "%s() This machine is running with DDR3 memory. "
                        "This is not currently supported. "
                        "DCHR0=0x%x DCHR1=0x%x\n",
                        __func__, pvt->dchr0, pvt->dchr1);

                amd64_printk(KERN_WARNING,
                        "   Contact '%s' module MAINTAINER to help add"
                        " support.\n",
                        EDAC_MOD_STR);

                ret = 1;

        }
        return ret;
}

/*
 * There currently are 3 types type of MC devices for AMD Athlon/Opterons
 * (as per PCI DEVICE_IDs):
 *
 * Family K8: That is the Athlon64 and Opteron CPUs. They all have the same PCI
 * DEVICE ID, even though there is differences between the different Revisions
 * (CG,D,E,F).
 *
 * Family F10h and F11h.
 *
 */
static struct amd64_family_type amd64_family_types[] = {
        [K8_CPUS] = {
                .ctl_name = "RevF",
                .addr_f1_ctl = PCI_DEVICE_ID_AMD_K8_NB_ADDRMAP,
                .misc_f3_ctl = PCI_DEVICE_ID_AMD_K8_NB_MISC,
                .ops = {
                        .early_channel_count = k8_early_channel_count,
                        .get_error_address = k8_get_error_address,
                        .read_dram_base_limit = k8_read_dram_base_limit,
                        .map_sysaddr_to_csrow = k8_map_sysaddr_to_csrow,
                        .dbam_map_to_pages = k8_dbam_map_to_pages,
                }
        },
        [F10_CPUS] = {
                .ctl_name = "Family 10h",
                .addr_f1_ctl = PCI_DEVICE_ID_AMD_10H_NB_MAP,
                .misc_f3_ctl = PCI_DEVICE_ID_AMD_10H_NB_MISC,
                .ops = {
                        .probe_valid_hardware = f10_probe_valid_hardware,
                        .early_channel_count = f10_early_channel_count,
                        .get_error_address = f10_get_error_address,
                        .read_dram_base_limit = f10_read_dram_base_limit,
                        .read_dram_ctl_register = f10_read_dram_ctl_register,
                        .map_sysaddr_to_csrow = f10_map_sysaddr_to_csrow,
                        .dbam_map_to_pages = f10_dbam_map_to_pages,
                }
        },
        [F11_CPUS] = {
                .ctl_name = "Family 11h",
                .addr_f1_ctl = PCI_DEVICE_ID_AMD_11H_NB_MAP,
                .misc_f3_ctl = PCI_DEVICE_ID_AMD_11H_NB_MISC,
                .ops = {
                        .probe_valid_hardware = f10_probe_valid_hardware,
                        .early_channel_count = f10_early_channel_count,
                        .get_error_address = f10_get_error_address,
                        .read_dram_base_limit = f10_read_dram_base_limit,
                        .read_dram_ctl_register = f10_read_dram_ctl_register,
                        .map_sysaddr_to_csrow = f10_map_sysaddr_to_csrow,
                        .dbam_map_to_pages = f10_dbam_map_to_pages,
                }
        },
};

static struct pci_dev *pci_get_related_function(unsigned int vendor,
                                                unsigned int device,
                                                struct pci_dev *related)
{
        struct pci_dev *dev = NULL;

        dev = pci_get_device(vendor, device, dev);
        while (dev) {
                if ((dev->bus->number == related->bus->number) &&
                    (PCI_SLOT(dev->devfn) == PCI_SLOT(related->devfn)))
                        break;
                dev = pci_get_device(vendor, device, dev);
        }

        return dev;
}

/*
 * syndrome mapping table for ECC ChipKill devices
 *
 * The comment in each row is the token (nibble) number that is in error.
 * The least significant nibble of the syndrome is the mask for the bits
 * that are in error (need to be toggled) for the particular nibble.
 *
 * Each row contains 16 entries.
 * The first entry (0th) is the channel number for that row of syndromes.
 * The remaining 15 entries are the syndromes for the respective Error
 * bit mask index.
 *
 * 1st index entry is 0x0001 mask, indicating that the rightmost bit is the
 * bit in error.
 * The 2nd index entry is 0x0010 that the second bit is damaged.
 * The 3rd index entry is 0x0011 indicating that the rightmost 2 bits
 * are damaged.
 * Thus so on until index 15, 0x1111, whose entry has the syndrome
 * indicating that all 4 bits are damaged.
 *
 * A search is performed on this table looking for a given syndrome.
 *
 * See the AMD documentation for ECC syndromes. This ECC table is valid
 * across all the versions of the AMD64 processors.
 *
 * A fast lookup is to use the LAST four bits of the 16-bit syndrome as a
 * COLUMN index, then search all ROWS of that column, looking for a match
 * with the input syndrome. The ROW value will be the token number.
 *
 * The 0'th entry on that row, can be returned as the CHANNEL (0 or 1) of this
 * error.
 */
#define NUMBER_ECC_ROWS  36
static const unsigned short ecc_chipkill_syndromes[NUMBER_ECC_ROWS][16] = {
        /* Channel 0 syndromes */
        {/*0*/  0, 0xe821, 0x7c32, 0x9413, 0xbb44, 0x5365, 0xc776, 0x2f57,
           0xdd88, 0x35a9, 0xa1ba, 0x499b, 0x66cc, 0x8eed, 0x1afe, 0xf2df },
        {/*1*/  0, 0x5d31, 0xa612, 0xfb23, 0x9584, 0xc8b5, 0x3396, 0x6ea7,
           0xeac8, 0xb7f9, 0x4cda, 0x11eb, 0x7f4c, 0x227d, 0xd95e, 0x846f },
        {/*2*/  0, 0x0001, 0x0002, 0x0003, 0x0004, 0x0005, 0x0006, 0x0007,
           0x0008, 0x0009, 0x000a, 0x000b, 0x000c, 0x000d, 0x000e, 0x000f },
        {/*3*/  0, 0x2021, 0x3032, 0x1013, 0x4044, 0x6065, 0x7076, 0x5057,
           0x8088, 0xa0a9, 0xb0ba, 0x909b, 0xc0cc, 0xe0ed, 0xf0fe, 0xd0df },
        {/*4*/  0, 0x5041, 0xa082, 0xf0c3, 0x9054, 0xc015, 0x30d6, 0x6097,
           0xe0a8, 0xb0e9, 0x402a, 0x106b, 0x70fc, 0x20bd, 0xd07e, 0x803f },
        {/*5*/  0, 0xbe21, 0xd732, 0x6913, 0x2144, 0x9f65, 0xf676, 0x4857,
           0x3288, 0x8ca9, 0xe5ba, 0x5b9b, 0x13cc, 0xaded, 0xc4fe, 0x7adf },
        {/*6*/  0, 0x4951, 0x8ea2, 0xc7f3, 0x5394, 0x1ac5, 0xdd36, 0x9467,
           0xa1e8, 0xe8b9, 0x2f4a, 0x661b, 0xf27c, 0xbb2d, 0x7cde, 0x358f },
        {/*7*/  0, 0x74e1, 0x9872, 0xec93, 0xd6b4, 0xa255, 0x4ec6, 0x3a27,
           0x6bd8, 0x1f39, 0xf3aa, 0x874b, 0xbd6c, 0xc98d, 0x251e, 0x51ff },
        {/*8*/  0, 0x15c1, 0x2a42, 0x3f83, 0xcef4, 0xdb35, 0xe4b6, 0xf177,
           0x4758, 0x5299, 0x6d1a, 0x78db, 0x89ac, 0x9c6d, 0xa3ee, 0xb62f },
        {/*9*/  0, 0x3d01, 0x1602, 0x2b03, 0x8504, 0xb805, 0x9306, 0xae07,
           0xca08, 0xf709, 0xdc0a, 0xe10b, 0x4f0c, 0x720d, 0x590e, 0x640f },
        {/*a*/  0, 0x9801, 0xec02, 0x7403, 0x6b04, 0xf305, 0x8706, 0x1f07,
           0xbd08, 0x2509, 0x510a, 0xc90b, 0xd60c, 0x4e0d, 0x3a0e, 0xa20f },
        {/*b*/  0, 0xd131, 0x6212, 0xb323, 0x3884, 0xe9b5, 0x5a96, 0x8ba7,
           0x1cc8, 0xcdf9, 0x7eda, 0xafeb, 0x244c, 0xf57d, 0x465e, 0x976f },
        {/*c*/  0, 0xe1d1, 0x7262, 0x93b3, 0xb834, 0x59e5, 0xca56, 0x2b87,
           0xdc18, 0x3dc9, 0xae7a, 0x4fab, 0x542c, 0x85fd, 0x164e, 0xf79f },
        {/*d*/  0, 0x6051, 0xb0a2, 0xd0f3, 0x1094, 0x70c5, 0xa036, 0xc067,
           0x20e8, 0x40b9, 0x904a, 0x601b, 0x307c, 0x502d, 0x80de, 0xe08f },
        {/*e*/  0, 0xa4c1, 0xf842, 0x5c83, 0xe6f4, 0x4235, 0x1eb6, 0xba77,
           0x7b58, 0xdf99, 0x831a, 0x27db, 0x9dac, 0x396d, 0x65ee, 0xc12f },
        {/*f*/  0, 0x11c1, 0x2242, 0x3383, 0xc8f4, 0xd935, 0xeab6, 0xfb77,
           0x4c58, 0x5d99, 0x6e1a, 0x7fdb, 0x84ac, 0x956d, 0xa6ee, 0xb72f },

        /* Channel 1 syndromes */
        {/*10*/ 1, 0x45d1, 0x8a62, 0xcfb3, 0x5e34, 0x1be5, 0xd456, 0x9187,
           0xa718, 0xe2c9, 0x2d7a, 0x68ab, 0xf92c, 0xbcfd, 0x734e, 0x369f },
        {/*11*/ 1, 0x63e1, 0xb172, 0xd293, 0x14b4, 0x7755, 0xa5c6, 0xc627,
           0x28d8, 0x4b39, 0x99aa, 0xfa4b, 0x3c6c, 0x5f8d, 0x8d1e, 0xeeff },
        {/*12*/ 1, 0xb741, 0xd982, 0x6ec3, 0x2254, 0x9515, 0xfbd6, 0x4c97,
           0x33a8, 0x84e9, 0xea2a, 0x5d6b, 0x11fc, 0xa6bd, 0xc87e, 0x7f3f },
        {/*13*/ 1, 0xdd41, 0x6682, 0xbbc3, 0x3554, 0xe815, 0x53d6, 0xce97,
           0x1aa8, 0xc7e9, 0x7c2a, 0xa1fb, 0x2ffc, 0xf2bd, 0x497e, 0x943f },
        {/*14*/ 1, 0x2bd1, 0x3d62, 0x16b3, 0x4f34, 0x64e5, 0x7256, 0x5987,
           0x8518, 0xaec9, 0xb87a, 0x93ab, 0xca2c, 0xe1fd, 0xf74e, 0xdc9f },
        {/*15*/ 1, 0x83c1, 0xc142, 0x4283, 0xa4f4, 0x2735, 0x65b6, 0xe677,
           0xf858, 0x7b99, 0x391a, 0xbadb, 0x5cac, 0xdf6d, 0x9dee, 0x1e2f },
        {/*16*/ 1, 0x8fd1, 0xc562, 0x4ab3, 0xa934, 0x26e5, 0x6c56, 0xe387,
           0xfe18, 0x71c9, 0x3b7a, 0xb4ab, 0x572c, 0xd8fd, 0x924e, 0x1d9f },
        {/*17*/ 1, 0x4791, 0x89e2, 0xce73, 0x5264, 0x15f5, 0xdb86, 0x9c17,
           0xa3b8, 0xe429, 0x2a5a, 0x6dcb, 0xf1dc, 0xb64d, 0x783e, 0x3faf },
        {/*18*/ 1, 0x5781, 0xa9c2, 0xfe43, 0x92a4, 0xc525, 0x3b66, 0x6ce7,
           0xe3f8, 0xb479, 0x4a3a, 0x1dbb, 0x715c, 0x26dd, 0xd89e, 0x8f1f },
        {/*19*/ 1, 0xbf41, 0xd582, 0x6ac3, 0x2954, 0x9615, 0xfcd6, 0x4397,
           0x3ea8, 0x81e9, 0xeb2a, 0x546b, 0x17fc, 0xa8bd, 0xc27e, 0x7d3f },
        {/*1a*/ 1, 0x9891, 0xe1e2, 0x7273, 0x6464, 0xf7f5, 0x8586, 0x1617,
           0xb8b8, 0x2b29, 0x595a, 0xcacb, 0xdcdc, 0x4f4d, 0x3d3e, 0xaeaf },
        {/*1b*/ 1, 0xcce1, 0x4472, 0x8893, 0xfdb4, 0x3f55, 0xb9c6, 0x7527,
           0x56d8, 0x9a39, 0x12aa, 0xde4b, 0xab6c, 0x678d, 0xef1e, 0x23ff },
        {/*1c*/ 1, 0xa761, 0xf9b2, 0x5ed3, 0xe214, 0x4575, 0x1ba6, 0xbcc7,
           0x7328, 0xd449, 0x8a9a, 0x2dfb, 0x913c, 0x365d, 0x688e, 0xcfef },
        {/*1d*/ 1, 0xff61, 0x55b2, 0xaad3, 0x7914, 0x8675, 0x2ca6, 0xd3c7,
           0x9e28, 0x6149, 0xcb9a, 0x34fb, 0xe73c, 0x185d, 0xb28e, 0x4def },
        {/*1e*/ 1, 0x5451, 0xa8a2, 0xfcf3, 0x9694, 0xc2c5, 0x3e36, 0x6a67,
           0xebe8, 0xbfb9, 0x434a, 0x171b, 0x7d7c, 0x292d, 0xd5de, 0x818f },
        {/*1f*/ 1, 0x6fc1, 0xb542, 0xda83, 0x19f4, 0x7635, 0xacb6, 0xc377,
           0x2e58, 0x4199, 0x9b1a, 0xf4db, 0x37ac, 0x586d, 0x82ee, 0xed2f },

        /* ECC bits are also in the set of tokens and they too can go bad
         * first 2 cover channel 0, while the second 2 cover channel 1
         */
        {/*20*/ 0, 0xbe01, 0xd702, 0x6903, 0x2104, 0x9f05, 0xf606, 0x4807,
           0x3208, 0x8c09, 0xe50a, 0x5b0b, 0x130c, 0xad0d, 0xc40e, 0x7a0f },
        {/*21*/ 0, 0x4101, 0x8202, 0xc303, 0x5804, 0x1905, 0xda06, 0x9b07,
           0xac08, 0xed09, 0x2e0a, 0x6f0b, 0x640c, 0xb50d, 0x760e, 0x370f },
        {/*22*/ 1, 0xc441, 0x4882, 0x8cc3, 0xf654, 0x3215, 0xbed6, 0x7a97,
           0x5ba8, 0x9fe9, 0x132a, 0xd76b, 0xadfc, 0x69bd, 0xe57e, 0x213f },
        {/*23*/ 1, 0x7621, 0x9b32, 0xed13, 0xda44, 0xac65, 0x4176, 0x3757,
           0x6f88, 0x19a9, 0xf4ba, 0x829b, 0xb5cc, 0xc3ed, 0x2efe, 0x58df }
};

/*
 * Given the syndrome argument, scan each of the channel tables for a syndrome
 * match. Depending on which table it is found, return the channel number.
 */
static int get_channel_from_ecc_syndrome(unsigned short syndrome)
{
        int row;
        int column;

        /* Determine column to scan */
        column = syndrome & 0xF;

        /* Scan all rows, looking for syndrome, or end of table */
        for (row = 0; row < NUMBER_ECC_ROWS; row++) {
                if (ecc_chipkill_syndromes[row][column] == syndrome)
                        return ecc_chipkill_syndromes[row][0];
        }

        debugf0("syndrome(%x) not found\n", syndrome);
        return -1;
}