source: trunk/chipset_enable.c @ 1463

/*
 * This file is part of the flashrom project.
 *
 * Copyright (C) 2000 Silicon Integrated System Corporation
 * Copyright (C) 2005-2009 coresystems GmbH
 * Copyright (C) 2006 Uwe Hermann <uwe@hermann-uwe.de>
 * Copyright (C) 2007,2008,2009 Carl-Daniel Hailfinger
 * Copyright (C) 2009 Kontron Modular Computers GmbH
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
 */

/*
 * Contains the chipset specific flash enables.
 */

#define _LARGEFILE64_SOURCE

#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <inttypes.h>
#include <errno.h>
#include "flash.h"
#include "programmer.h"

#define NOT_DONE_YET 1

#if defined(__i386__) || defined(__x86_64__)

static int enable_flash_ali_m1533(struct pci_dev *dev, const char *name)
{
        uint8_t tmp;

        /*
         * ROM Write enable, 0xFFFC0000-0xFFFDFFFF and
         * 0xFFFE0000-0xFFFFFFFF ROM select enable.
         */
        tmp = pci_read_byte(dev, 0x47);
        tmp |= 0x46;
        rpci_write_byte(dev, 0x47, tmp);

        return 0;
}

static int enable_flash_sis85c496(struct pci_dev *dev, const char *name)
{
        uint8_t tmp;

        tmp = pci_read_byte(dev, 0xd0);
        tmp |= 0xf8;
        rpci_write_byte(dev, 0xd0, tmp);

        return 0;
}

static int enable_flash_sis_mapping(struct pci_dev *dev, const char *name)
{
        uint8_t new, newer;

        /* Extended BIOS enable = 1, Lower BIOS Enable = 1 */
        /* This is 0xFFF8000~0xFFFF0000 decoding on SiS 540/630. */
        new = pci_read_byte(dev, 0x40);
        new &= (~0x04); /* No idea why we clear bit 2. */
        new |= 0xb; /* 0x3 for some chipsets, bit 7 seems to be don't care. */
        rpci_write_byte(dev, 0x40, new);
        newer = pci_read_byte(dev, 0x40);
        if (newer != new) {
                msg_pinfo("Setting register 0x%x to 0x%x on %s failed "
                          "(WARNING ONLY).\n", 0x40, new, name);
                msg_pinfo("Stuck at 0x%x\n", newer);
                return -1;
        }
        return 0;
}

static struct pci_dev *find_southbridge(uint16_t vendor, const char *name)
{
        struct pci_dev *sbdev;

        sbdev = pci_dev_find_vendorclass(vendor, 0x0601);
        if (!sbdev)
                sbdev = pci_dev_find_vendorclass(vendor, 0x0680);
        if (!sbdev)
                sbdev = pci_dev_find_vendorclass(vendor, 0x0000);
        if (!sbdev)
                msg_perr("No southbridge found for %s!\n", name);
        if (sbdev)
                msg_pdbg("Found southbridge %04x:%04x at %02x:%02x:%01x\n",
                         sbdev->vendor_id, sbdev->device_id,
                         sbdev->bus, sbdev->dev, sbdev->func);
        return sbdev;
}

static int enable_flash_sis501(struct pci_dev *dev, const char *name)
{
        uint8_t tmp;
        int ret = 0;
        struct pci_dev *sbdev;

        sbdev = find_southbridge(dev->vendor_id, name);
        if (!sbdev)
                return -1;

        ret = enable_flash_sis_mapping(sbdev, name);

        tmp = sio_read(0x22, 0x80);
        tmp &= (~0x20);
        tmp |= 0x4;
        sio_write(0x22, 0x80, tmp);

        tmp = sio_read(0x22, 0x70);
        tmp &= (~0x20);
        tmp |= 0x4;
        sio_write(0x22, 0x70, tmp);
        
        return ret;
}

static int enable_flash_sis5511(struct pci_dev *dev, const char *name)
{
        uint8_t tmp;
        int ret = 0;
        struct pci_dev *sbdev;

        sbdev = find_southbridge(dev->vendor_id, name);
        if (!sbdev)
                return -1;

        ret = enable_flash_sis_mapping(sbdev, name);

        tmp = sio_read(0x22, 0x50);
        tmp &= (~0x20);
        tmp |= 0x4;
        sio_write(0x22, 0x50, tmp);

        return ret;
}

static int enable_flash_sis530(struct pci_dev *dev, const char *name)
{
        uint8_t new, newer;
        int ret = 0;
        struct pci_dev *sbdev;

        sbdev = find_southbridge(dev->vendor_id, name);
        if (!sbdev)
                return -1;

        ret = enable_flash_sis_mapping(sbdev, name);

        new = pci_read_byte(sbdev, 0x45);
        new &= (~0x20);
        new |= 0x4;
        rpci_write_byte(sbdev, 0x45, new);
        newer = pci_read_byte(sbdev, 0x45);
        if (newer != new) {
                msg_pinfo("Setting register 0x%x to 0x%x on %s failed "
                          "(WARNING ONLY).\n", 0x45, new, name);
                msg_pinfo("Stuck at 0x%x\n", newer);
                ret = -1;
        }

        return ret;
}

static int enable_flash_sis540(struct pci_dev *dev, const char *name)
{
        uint8_t new, newer;
        int ret = 0;
        struct pci_dev *sbdev;

        sbdev = find_southbridge(dev->vendor_id, name);
        if (!sbdev)
                return -1;

        ret = enable_flash_sis_mapping(sbdev, name);

        new = pci_read_byte(sbdev, 0x45);
        new &= (~0x80);
        new |= 0x40;
        rpci_write_byte(sbdev, 0x45, new);
        newer = pci_read_byte(sbdev, 0x45);
        if (newer != new) {
                msg_pinfo("Setting register 0x%x to 0x%x on %s failed "
                          "(WARNING ONLY).\n", 0x45, new, name);
                msg_pinfo("Stuck at 0x%x\n", newer);
                ret = -1;
        }

        return ret;
}

/* Datasheet:
 *   - Name: 82371AB PCI-TO-ISA / IDE XCELERATOR (PIIX4)
 *   - URL: http://www.intel.com/design/intarch/datashts/290562.htm
 *   - PDF: http://www.intel.com/design/intarch/datashts/29056201.pdf
 *   - Order Number: 290562-001
 */
static int enable_flash_piix4(struct pci_dev *dev, const char *name)
{
        uint16_t old, new;
        uint16_t xbcs = 0x4e;   /* X-Bus Chip Select register. */

        internal_buses_supported = BUS_PARALLEL;

        old = pci_read_word(dev, xbcs);

        /* Set bit 9: 1-Meg Extended BIOS Enable (PCI master accesses to
         *            FFF00000-FFF7FFFF are forwarded to ISA).
         *            Note: This bit is reserved on PIIX/PIIX3/MPIIX.
         * Set bit 7: Extended BIOS Enable (PCI master accesses to
         *            FFF80000-FFFDFFFF are forwarded to ISA).
         * Set bit 6: Lower BIOS Enable (PCI master, or ISA master accesses to
         *            the lower 64-Kbyte BIOS block (E0000-EFFFF) at the top
         *            of 1 Mbyte, or the aliases at the top of 4 Gbyte
         *            (FFFE0000-FFFEFFFF) result in the generation of BIOSCS#.
         * Note: Accesses to FFFF0000-FFFFFFFF are always forwarded to ISA.
         * Set bit 2: BIOSCS# Write Enable (1=enable, 0=disable).
         */
        if (dev->device_id == 0x122e || dev->device_id == 0x7000
            || dev->device_id == 0x1234)
                new = old | 0x00c4; /* PIIX/PIIX3/MPIIX: Bit 9 is reserved. */
        else
                new = old | 0x02c4;

        if (new == old)
                return 0;

        rpci_write_word(dev, xbcs, new);

        if (pci_read_word(dev, xbcs) != new) {
                msg_pinfo("Setting register 0x%x to 0x%x on %s failed "
                          "(WARNING ONLY).\n", xbcs, new, name);
                return -1;
        }

        return 0;
}

/*
 * See ie. page 375 of "Intel I/O Controller Hub 7 (ICH7) Family Datasheet"
 * http://download.intel.com/design/chipsets/datashts/30701303.pdf
 */
static int enable_flash_ich(struct pci_dev *dev, const char *name,
                            int bios_cntl)
{
        uint8_t old, new, wanted;

        /*
         * Note: the ICH0-ICH5 BIOS_CNTL register is actually 16 bit wide, but
         * just treating it as 8 bit wide seems to work fine in practice.
         */
        old = pci_read_byte(dev, bios_cntl);

        msg_pdbg("\nBIOS Lock Enable: %sabled, ",
                 (old & (1 << 1)) ? "en" : "dis");
        msg_pdbg("BIOS Write Enable: %sabled, ",
                 (old & (1 << 0)) ? "en" : "dis");
        msg_pdbg("BIOS_CNTL is 0x%x\n", old);

        /*
         * Quote from the 6 Series datasheet (Document Number: 324645-004):
         * "Bit 5: SMM BIOS Write Protect Disable (SMM_BWP)
         * 1 = BIOS region SMM protection is enabled.
         * The BIOS Region is not writable unless all processors are in SMM."
         * In earlier chipsets this bit is reserved.
         */
        if (old & (1 << 5))
                msg_pinfo("WARNING: BIOS region SMM protection is enabled!\n");

        wanted = old | 1;
        if (wanted == old)
                return 0;

        rpci_write_byte(dev, bios_cntl, wanted);

        if ((new = pci_read_byte(dev, bios_cntl)) != wanted) {
                msg_pinfo("WARNING: Setting 0x%x from 0x%x to 0x%x on %s "
                          "failed. New value is 0x%x.\n",
                          bios_cntl, old, wanted, name, new);
                return -1;
        }

        return 0;
}

static int enable_flash_ich_4e(struct pci_dev *dev, const char *name)
{
        /*
         * Note: ICH5 has registers similar to FWH_SEL1, FWH_SEL2 and
         * FWH_DEC_EN1, but they are called FB_SEL1, FB_SEL2, FB_DEC_EN1 and
         * FB_DEC_EN2.
         */
        internal_buses_supported = BUS_FWH;
        return enable_flash_ich(dev, name, 0x4e);
}

static int enable_flash_ich_dc(struct pci_dev *dev, const char *name)
{
        uint32_t fwh_conf;
        int i, tmp;
        char *idsel = NULL;
        int max_decode_fwh_idsel = 0, max_decode_fwh_decode = 0;
        int contiguous = 1;

        idsel = extract_programmer_param("fwh_idsel");
        if (idsel && strlen(idsel)) {
                uint64_t fwh_idsel_old, fwh_idsel;
                errno = 0;
                /* Base 16, nothing else makes sense. */
                fwh_idsel = (uint64_t)strtoull(idsel, NULL, 16);
                if (errno) {
                        msg_perr("Error: fwh_idsel= specified, but value could "
                                 "not be converted.\n");
                        goto idsel_garbage_out;
                }
                if (fwh_idsel & 0xffff000000000000ULL) {
                        msg_perr("Error: fwh_idsel= specified, but value had "
                                 "unused bits set.\n");
                        goto idsel_garbage_out;
                }
                fwh_idsel_old = pci_read_long(dev, 0xd0);
                fwh_idsel_old <<= 16;
                fwh_idsel_old |= pci_read_word(dev, 0xd4);
                msg_pdbg("\nSetting IDSEL from 0x%012" PRIx64 " to "
                         "0x%012" PRIx64 " for top 16 MB.", fwh_idsel_old,
                         fwh_idsel);
                rpci_write_long(dev, 0xd0, (fwh_idsel >> 16) & 0xffffffff);
                rpci_write_word(dev, 0xd4, fwh_idsel & 0xffff);
                /* FIXME: Decode settings are not changed. */
        } else if (idsel) {
                msg_perr("Error: fwh_idsel= specified, but no value given.\n");
idsel_garbage_out:
                free(idsel);
                return ERROR_FATAL;
        }
        free(idsel);

        /* Ignore all legacy ranges below 1 MB.
         * We currently only support flashing the chip which responds to
         * IDSEL=0. To support IDSEL!=0, flashbase and decode size calculations
         * have to be adjusted.
         */
        /* FWH_SEL1 */
        fwh_conf = pci_read_long(dev, 0xd0);
        for (i = 7; i >= 0; i--) {
                tmp = (fwh_conf >> (i * 4)) & 0xf;
                msg_pdbg("\n0x%08x/0x%08x FWH IDSEL: 0x%x",
                         (0x1ff8 + i) * 0x80000,
                         (0x1ff0 + i) * 0x80000,
                         tmp);
                if ((tmp == 0) && contiguous) {
                        max_decode_fwh_idsel = (8 - i) * 0x80000;
                } else {
                        contiguous = 0;
                }
        }
        /* FWH_SEL2 */
        fwh_conf = pci_read_word(dev, 0xd4);
        for (i = 3; i >= 0; i--) {
                tmp = (fwh_conf >> (i * 4)) & 0xf;
                msg_pdbg("\n0x%08x/0x%08x FWH IDSEL: 0x%x",
                         (0xff4 + i) * 0x100000,
                         (0xff0 + i) * 0x100000,
                         tmp);
                if ((tmp == 0) && contiguous) {
                        max_decode_fwh_idsel = (8 - i) * 0x100000;
                } else {
                        contiguous = 0;
                }
        }
        contiguous = 1;
        /* FWH_DEC_EN1 */
        fwh_conf = pci_read_word(dev, 0xd8);
        for (i = 7; i >= 0; i--) {
                tmp = (fwh_conf >> (i + 0x8)) & 0x1;
                msg_pdbg("\n0x%08x/0x%08x FWH decode %sabled",
                         (0x1ff8 + i) * 0x80000,
                         (0x1ff0 + i) * 0x80000,
                         tmp ? "en" : "dis");
                if ((tmp == 1) && contiguous) {
                        max_decode_fwh_decode = (8 - i) * 0x80000;
                } else {
                        contiguous = 0;
                }
        }
        for (i = 3; i >= 0; i--) {
                tmp = (fwh_conf >> i) & 0x1;
                msg_pdbg("\n0x%08x/0x%08x FWH decode %sabled",
                         (0xff4 + i) * 0x100000,
                         (0xff0 + i) * 0x100000,
                         tmp ? "en" : "dis");
                if ((tmp == 1) && contiguous) {
                        max_decode_fwh_decode = (8 - i) * 0x100000;
                } else {
                        contiguous = 0;
                }
        }
        max_rom_decode.fwh = min(max_decode_fwh_idsel, max_decode_fwh_decode);
        msg_pdbg("\nMaximum FWH chip size: 0x%x bytes", max_rom_decode.fwh);

        /* If we're called by enable_flash_ich_dc_spi, it will override
         * internal_buses_supported anyway.
         */
        internal_buses_supported = BUS_FWH;
        return enable_flash_ich(dev, name, 0xdc);
}

static int enable_flash_poulsbo(struct pci_dev *dev, const char *name)
{
        uint16_t old, new;
        int err;

        if ((err = enable_flash_ich(dev, name, 0xd8)) != 0)
                return err;

        old = pci_read_byte(dev, 0xd9);
        msg_pdbg("BIOS Prefetch Enable: %sabled, ",
                 (old & 1) ? "en" : "dis");
        new = old & ~1;

        if (new != old)
                rpci_write_byte(dev, 0xd9, new);

        internal_buses_supported = BUS_FWH;
        return 0;
}

static int enable_flash_tunnelcreek(struct pci_dev *dev, const char *name)
{
        uint16_t old, new;
        uint32_t tmp, bnt;
        void *rcrb;
        int ret;

        /* Enable Flash Writes */
        ret = enable_flash_ich(dev, name, 0xd8);
        if (ret == ERROR_FATAL)
                return ret;

        /* Make sure BIOS prefetch mechanism is disabled */
        old = pci_read_byte(dev, 0xd9);
        msg_pdbg("BIOS Prefetch Enable: %sabled, ", (old & 1) ? "en" : "dis");
        new = old & ~1;
        if (new != old)
                rpci_write_byte(dev, 0xd9, new);

        /* Get physical address of Root Complex Register Block */
        tmp = pci_read_long(dev, 0xf0) & 0xffffc000;
        msg_pdbg("\nRoot Complex Register Block address = 0x%x\n", tmp);

        /* Map RCBA to virtual memory */
        rcrb = physmap("ICH RCRB", tmp, 0x4000);

        /* Test Boot BIOS Strap Status */
        bnt = mmio_readl(rcrb + 0x3410);
        if (bnt & 0x02) {
                /* If strapped to LPC, no SPI initialization is required */
                internal_buses_supported = BUS_FWH;
                return 0;
        }

        /* This adds BUS_SPI */
        if (ich_init_spi(dev, tmp, rcrb, 7) != 0) {
                if (!ret)
                        ret = ERROR_NONFATAL;
        }

        return ret;
}

static int enable_flash_vt8237s_spi(struct pci_dev *dev, const char *name)
{
        /* Do we really need no write enable? */
        return via_init_spi(dev);
}

static int enable_flash_ich_dc_spi(struct pci_dev *dev, const char *name,
                                   enum ich_chipset ich_generation)
{
        int ret, ret_spi;
        uint8_t bbs, buc;
        uint32_t tmp, gcs;
        void *rcrb;
        const char *const *straps_names;

        static const char *const straps_names_EP80579[] = { "SPI", "reserved", "reserved", "LPC" };
        static const char *const straps_names_ich7_nm10[] = { "reserved", "SPI", "PCI", "LPC" };
        static const char *const straps_names_ich8910[] = { "SPI", "SPI", "PCI", "LPC" };
        static const char *const straps_names_pch56[] = { "LPC", "reserved", "PCI", "SPI" };
        static const char *const straps_names_unknown[] = { "unknown", "unknown", "unknown", "unknown" };

        switch (ich_generation) {
        case CHIPSET_ICH7:
                /* EP80579 may need further changes, but this is the least
                 * intrusive way to get correct BOOT Strap printing without
                 * changing the rest of its code path). */
                if (strcmp(name, "EP80579") == 0)
                        straps_names = straps_names_EP80579;
                else
                        straps_names = straps_names_ich7_nm10;
                break;
        case CHIPSET_ICH8:
        case CHIPSET_ICH9:
        case CHIPSET_ICH10:
                straps_names = straps_names_ich8910;
                break;
        case CHIPSET_5_SERIES_IBEX_PEAK:
        case CHIPSET_6_SERIES_COUGAR_POINT:
                straps_names = straps_names_pch56;
                break;
        default:
                msg_gerr("%s: unknown ICH generation. Please report!\n",
                         __func__);
                straps_names = straps_names_unknown;
                break;
        }

        /* Enable Flash Writes */
        ret = enable_flash_ich_dc(dev, name);
        if (ret == ERROR_FATAL)
                return ret;

        /* Get physical address of Root Complex Register Block */
        tmp = pci_read_long(dev, 0xf0) & 0xffffc000;
        msg_pdbg("Root Complex Register Block address = 0x%x\n", tmp);

        /* Map RCBA to virtual memory */
        rcrb = physmap("ICH RCRB", tmp, 0x4000);

        gcs = mmio_readl(rcrb + 0x3410);
        msg_pdbg("GCS = 0x%x: ", gcs);
        msg_pdbg("BIOS Interface Lock-Down: %sabled, ",
                 (gcs & 0x1) ? "en" : "dis");
        bbs = (gcs >> 10) & 0x3;
        msg_pdbg("Boot BIOS Straps: 0x%x (%s)\n", bbs, straps_names[bbs]);

        buc = mmio_readb(rcrb + 0x3414);
        msg_pdbg("Top Swap : %s\n",
                 (buc & 1) ? "enabled (A16 inverted)" : "not enabled");

        /* It seems the ICH7 does not support SPI and LPC chips at the same
         * time. At least not with our current code. So we prevent searching
         * on ICH7 when the southbridge is strapped to LPC
         */
        internal_buses_supported = BUS_FWH;
        if (ich_generation == CHIPSET_ICH7) {
                if (bbs == 0x03) {
                        /* If strapped to LPC, no further SPI initialization is
                         * required. */
                        return ret;
                } else {
                        /* Disable LPC/FWH if strapped to PCI or SPI */
                        internal_buses_supported = BUS_NONE;
                }
        }

        /* This adds BUS_SPI */
        ret_spi = ich_init_spi(dev, tmp, rcrb, ich_generation);
        if (ret_spi == ERROR_FATAL)
                return ret_spi;
        
        if (ret || ret_spi)
                ret = ERROR_NONFATAL;

        return ret;
}

static int enable_flash_ich7(struct pci_dev *dev, const char *name)
{
        return enable_flash_ich_dc_spi(dev, name, CHIPSET_ICH7);
}

static int enable_flash_ich8(struct pci_dev *dev, const char *name)
{
        return enable_flash_ich_dc_spi(dev, name, CHIPSET_ICH8);
}

static int enable_flash_ich9(struct pci_dev *dev, const char *name)
{
        return enable_flash_ich_dc_spi(dev, name, CHIPSET_ICH9);
}

static int enable_flash_ich10(struct pci_dev *dev, const char *name)
{
        return enable_flash_ich_dc_spi(dev, name, CHIPSET_ICH10);
}

/* Ibex Peak aka. 5 series & 3400 series */
static int enable_flash_pch5(struct pci_dev *dev, const char *name)
{
        return enable_flash_ich_dc_spi(dev, name, CHIPSET_5_SERIES_IBEX_PEAK);
}

/* Cougar Point aka. 6 series & c200 series */
static int enable_flash_pch6(struct pci_dev *dev, const char *name)
{
        return enable_flash_ich_dc_spi(dev, name, CHIPSET_6_SERIES_COUGAR_POINT);
}

static int via_no_byte_merge(struct pci_dev *dev, const char *name)
{
        uint8_t val;

        val = pci_read_byte(dev, 0x71);
        if (val & 0x40) {
                msg_pdbg("Disabling byte merging\n");
                val &= ~0x40;
                rpci_write_byte(dev, 0x71, val);
        }
        return NOT_DONE_YET;    /* need to find south bridge, too */
}

static int enable_flash_vt823x(struct pci_dev *dev, const char *name)
{
        uint8_t val;

        /* Enable ROM decode range (1MB) FFC00000 - FFFFFFFF. */
        rpci_write_byte(dev, 0x41, 0x7f);

        /* ROM write enable */
        val = pci_read_byte(dev, 0x40);
        val |= 0x10;
        rpci_write_byte(dev, 0x40, val);

        if (pci_read_byte(dev, 0x40) != val) {
                msg_pinfo("\nWARNING: Failed to enable flash write on \"%s\"\n",
                          name);
                return -1;
        }

        if (dev->device_id == 0x3227) { /* VT8237R */
                /* All memory cycles, not just ROM ones, go to LPC. */
                val = pci_read_byte(dev, 0x59);
                val &= ~0x80;
                rpci_write_byte(dev, 0x59, val);
        }

        return 0;
}

static int enable_flash_cs5530(struct pci_dev *dev, const char *name)
{
        uint8_t reg8;

#define DECODE_CONTROL_REG2             0x5b    /* F0 index 0x5b */
#define ROM_AT_LOGIC_CONTROL_REG        0x52    /* F0 index 0x52 */
#define CS5530_RESET_CONTROL_REG        0x44    /* F0 index 0x44 */
#define CS5530_USB_SHADOW_REG           0x43    /* F0 index 0x43 */

#define LOWER_ROM_ADDRESS_RANGE         (1 << 0)
#define ROM_WRITE_ENABLE                (1 << 1)
#define UPPER_ROM_ADDRESS_RANGE         (1 << 2)
#define BIOS_ROM_POSITIVE_DECODE        (1 << 5)
#define CS5530_ISA_MASTER               (1 << 7)
#define CS5530_ENABLE_SA2320            (1 << 2)
#define CS5530_ENABLE_SA20              (1 << 6)

        internal_buses_supported = BUS_PARALLEL;
        /* Decode 0x000E0000-0x000FFFFF (128 kB), not just 64 kB, and
         * decode 0xFF000000-0xFFFFFFFF (16 MB), not just 256 kB.
         * FIXME: Should we really touch the low mapping below 1 MB? Flashrom
         * ignores that region completely.
         * Make the configured ROM areas writable.
         */
        reg8 = pci_read_byte(dev, ROM_AT_LOGIC_CONTROL_REG);
        reg8 |= LOWER_ROM_ADDRESS_RANGE;
        reg8 |= UPPER_ROM_ADDRESS_RANGE;
        reg8 |= ROM_WRITE_ENABLE;
        rpci_write_byte(dev, ROM_AT_LOGIC_CONTROL_REG, reg8);

        /* Set positive decode on ROM. */
        reg8 = pci_read_byte(dev, DECODE_CONTROL_REG2);
        reg8 |= BIOS_ROM_POSITIVE_DECODE;
        rpci_write_byte(dev, DECODE_CONTROL_REG2, reg8);

        reg8 = pci_read_byte(dev, CS5530_RESET_CONTROL_REG);
        if (reg8 & CS5530_ISA_MASTER) {
                /* We have A0-A23 available. */
                max_rom_decode.parallel = 16 * 1024 * 1024;
        } else {
                reg8 = pci_read_byte(dev, CS5530_USB_SHADOW_REG);
                if (reg8 & CS5530_ENABLE_SA2320) {
                        /* We have A0-19, A20-A23 available. */
                        max_rom_decode.parallel = 16 * 1024 * 1024;
                } else if (reg8 & CS5530_ENABLE_SA20) {
                        /* We have A0-19, A20 available. */
                        max_rom_decode.parallel = 2 * 1024 * 1024;
                } else {
                        /* A20 and above are not active. */
                        max_rom_decode.parallel = 1024 * 1024;
                }
        }

        return 0;
}

/*
 * Geode systems write protect the BIOS via RCONFs (cache settings similar
 * to MTRRs). To unlock, change MSR 0x1808 top byte to 0x22. 
 *
 * Geode systems also write protect the NOR flash chip itself via MSR_NORF_CTL.
 * To enable write to NOR Boot flash for the benefit of systems that have such
 * a setup, raise MSR 0x51400018 WE_CS3 (write enable Boot Flash Chip Select).
 */
static int enable_flash_cs5536(struct pci_dev *dev, const char *name)
{
#define MSR_RCONF_DEFAULT       0x1808
#define MSR_NORF_CTL            0x51400018

        msr_t msr;

        /* Geode only has a single core */
        if (setup_cpu_msr(0))
                return -1;

        msr = rdmsr(MSR_RCONF_DEFAULT);
        if ((msr.hi >> 24) != 0x22) {
                msr.hi &= 0xfbffffff;
                wrmsr(MSR_RCONF_DEFAULT, msr);
        }

        msr = rdmsr(MSR_NORF_CTL);
        /* Raise WE_CS3 bit. */
        msr.lo |= 0x08;
        wrmsr(MSR_NORF_CTL, msr);

        cleanup_cpu_msr();

#undef MSR_RCONF_DEFAULT
#undef MSR_NORF_CTL
        return 0;
}

static int enable_flash_sc1100(struct pci_dev *dev, const char *name)
{
        uint8_t new;

        rpci_write_byte(dev, 0x52, 0xee);

        new = pci_read_byte(dev, 0x52);

        if (new != 0xee) {
                msg_pinfo("Setting register 0x%x to 0x%x on %s failed "
                          "(WARNING ONLY).\n", 0x52, new, name);
                return -1;
        }

        return 0;
}

/* Works for AMD-8111, VIA VT82C586A/B, VIA VT82C686A/B. */
static int enable_flash_amd8111(struct pci_dev *dev, const char *name)
{
        uint8_t old, new;

        /* Enable decoding at 0xffb00000 to 0xffffffff. */
        old = pci_read_byte(dev, 0x43);
        new = old | 0xC0;
        if (new != old) {
                rpci_write_byte(dev, 0x43, new);
                if (pci_read_byte(dev, 0x43) != new) {
                        msg_pinfo("Setting register 0x%x to 0x%x on %s failed "
                                  "(WARNING ONLY).\n", 0x43, new, name);
                }
        }

        /* Enable 'ROM write' bit. */
        old = pci_read_byte(dev, 0x40);
        new = old | 0x01;
        if (new == old)
                return 0;
        rpci_write_byte(dev, 0x40, new);

        if (pci_read_byte(dev, 0x40) != new) {
                msg_pinfo("Setting register 0x%x to 0x%x on %s failed "
                          "(WARNING ONLY).\n", 0x40, new, name);
                return -1;
        }

        return 0;
}

static int enable_flash_sb600(struct pci_dev *dev, const char *name)
{
        uint32_t prot;
        uint8_t reg;
        int ret;

        /* Clear ROM protect 0-3. */
        for (reg = 0x50; reg < 0x60; reg += 4) {
                prot = pci_read_long(dev, reg);
                /* No protection flags for this region?*/
                if ((prot & 0x3) == 0)
                        continue;
                msg_pinfo("SB600 %s%sprotected from 0x%08x to 0x%08x\n",
                          (prot & 0x1) ? "write " : "",
                          (prot & 0x2) ? "read " : "",
                          (prot & 0xfffff800),
                          (prot & 0xfffff800) + (((prot & 0x7fc) << 8) | 0x3ff));
                prot &= 0xfffffffc;
                rpci_write_byte(dev, reg, prot);
                prot = pci_read_long(dev, reg);
                if (prot & 0x3)
                        msg_perr("SB600 %s%sunprotect failed from 0x%08x to 0x%08x\n",
                                 (prot & 0x1) ? "write " : "",
                                 (prot & 0x2) ? "read " : "",
                                 (prot & 0xfffff800),
                                 (prot & 0xfffff800) + (((prot & 0x7fc) << 8) | 0x3ff));
        }

        internal_buses_supported = BUS_LPC | BUS_FWH;

        ret = sb600_probe_spi(dev);

        /* Read ROM strap override register. */
        OUTB(0x8f, 0xcd6);
        reg = INB(0xcd7);
        reg &= 0x0e;
        msg_pdbg("ROM strap override is %sactive", (reg & 0x02) ? "" : "not ");
        if (reg & 0x02) {
                switch ((reg & 0x0c) >> 2) {
                case 0x00:
                        msg_pdbg(": LPC");
                        break;
                case 0x01:
                        msg_pdbg(": PCI");
                        break;
                case 0x02:
                        msg_pdbg(": FWH");
                        break;
                case 0x03:
                        msg_pdbg(": SPI");
                        break;
                }
        }
        msg_pdbg("\n");

        /* Force enable SPI ROM in SB600 PM register.
         * If we enable SPI ROM here, we have to disable it after we leave.
         * But how can we know which ROM we are going to handle? So we have
         * to trade off. We only access LPC ROM if we boot via LPC ROM. And
         * only SPI ROM if we boot via SPI ROM. If you want to access SPI on
         * boards with LPC straps, you have to use the code below.
         */
        /*
        OUTB(0x8f, 0xcd6);
        OUTB(0x0e, 0xcd7);
        */

        return ret;
}

static int enable_flash_nvidia_nforce2(struct pci_dev *dev, const char *name)
{
        uint8_t tmp;

        rpci_write_byte(dev, 0x92, 0);

        tmp = pci_read_byte(dev, 0x6d);
        tmp |= 0x01;
        rpci_write_byte(dev, 0x6d, tmp);

        return 0;
}

static int enable_flash_ck804(struct pci_dev *dev, const char *name)
{
        uint8_t old, new;

        pci_write_byte(dev, 0x92, 0x00);
        if (pci_read_byte(dev, 0x92) != 0x00) {
                msg_pinfo("Setting register 0x%x to 0x%x on %s failed "
                          "(WARNING ONLY).\n", 0x92, 0x00, name);
        }

        old = pci_read_byte(dev, 0x88);
        new = old | 0xc0;
        if (new != old) {
                rpci_write_byte(dev, 0x88, new);
                if (pci_read_byte(dev, 0x88) != new) {
                        msg_pinfo("Setting register 0x%x to 0x%x on %s failed "
                                  "(WARNING ONLY).\n", 0x88, new, name);
                }
        }

        old = pci_read_byte(dev, 0x6d);
        new = old | 0x01;
        if (new == old)
                return 0;
        rpci_write_byte(dev, 0x6d, new);

        if (pci_read_byte(dev, 0x6d) != new) {
                msg_pinfo("Setting register 0x%x to 0x%x on %s failed "
                          "(WARNING ONLY).\n", 0x6d, new, name);
                return -1;
        }

        return 0;
}

static int enable_flash_osb4(struct pci_dev *dev, const char *name)
{
        uint8_t tmp;

        internal_buses_supported = BUS_PARALLEL;

        tmp = INB(0xc06);
        tmp |= 0x1;
        OUTB(tmp, 0xc06);

        tmp = INB(0xc6f);
        tmp |= 0x40;
        OUTB(tmp, 0xc6f);

        return 0;
}

/* ATI Technologies Inc IXP SB400 PCI-ISA Bridge (rev 80) */
static int enable_flash_sb400(struct pci_dev *dev, const char *name)
{
        uint8_t tmp;
        struct pci_dev *smbusdev;

        /* Look for the SMBus device. */
        smbusdev = pci_dev_find(0x1002, 0x4372);

        if (!smbusdev) {
                msg_perr("ERROR: SMBus device not found. Aborting.\n");
                return ERROR_FATAL;
        }

        /* Enable some SMBus stuff. */
        tmp = pci_read_byte(smbusdev, 0x79);
        tmp |= 0x01;
        rpci_write_byte(smbusdev, 0x79, tmp);

        /* Change southbridge. */
        tmp = pci_read_byte(dev, 0x48);
        tmp |= 0x21;
        rpci_write_byte(dev, 0x48, tmp);

        /* Now become a bit silly. */
        tmp = INB(0xc6f);
        OUTB(tmp, 0xeb);
        OUTB(tmp, 0xeb);
        tmp |= 0x40;
        OUTB(tmp, 0xc6f);
        OUTB(tmp, 0xeb);
        OUTB(tmp, 0xeb);

        return 0;
}

static int enable_flash_mcp55(struct pci_dev *dev, const char *name)
{
        uint8_t old, new, val;
        uint16_t wordval;

        /* Set the 0-16 MB enable bits. */
        val = pci_read_byte(dev, 0x88);
        val |= 0xff;            /* 256K */
        rpci_write_byte(dev, 0x88, val);
        val = pci_read_byte(dev, 0x8c);
        val |= 0xff;            /* 1M */
        rpci_write_byte(dev, 0x8c, val);
        wordval = pci_read_word(dev, 0x90);
        wordval |= 0x7fff;      /* 16M */
        rpci_write_word(dev, 0x90, wordval);

        old = pci_read_byte(dev, 0x6d);
        new = old | 0x01;
        if (new == old)
                return 0;
        rpci_write_byte(dev, 0x6d, new);

        if (pci_read_byte(dev, 0x6d) != new) {
                msg_pinfo("Setting register 0x%x to 0x%x on %s failed "
                          "(WARNING ONLY).\n", 0x6d, new, name);
                return -1;
        }

        return 0;
}

/*
 * The MCP6x/MCP7x code is based on cleanroom reverse engineering.
 * It is assumed that LPC chips need the MCP55 code and SPI chips need the
 * code provided in enable_flash_mcp6x_7x_common.
 */
static int enable_flash_mcp6x_7x(struct pci_dev *dev, const char *name)
{
        int ret = 0, want_spi = 0;
        uint8_t val;

        msg_pinfo("This chipset is not really supported yet. Guesswork...\n");

        /* dev is the ISA bridge. No idea what the stuff below does. */
        val = pci_read_byte(dev, 0x8a);
        msg_pdbg("ISA/LPC bridge reg 0x8a contents: 0x%02x, bit 6 is %i, bit 5 "
                 "is %i\n", val, (val >> 6) & 0x1, (val >> 5) & 0x1);

        switch ((val >> 5) & 0x3) {
        case 0x0:
                ret = enable_flash_mcp55(dev, name);
                internal_buses_supported = BUS_LPC;
                msg_pdbg("Flash bus type is LPC\n");
                break;
        case 0x2:
                want_spi = 1;
                /* SPI is added in mcp6x_spi_init if it works.
                 * Do we really want to disable LPC in this case?
                 */
                internal_buses_supported = BUS_NONE;
                msg_pdbg("Flash bus type is SPI\n");
                msg_pinfo("SPI on this chipset is WIP. Please report any "
                          "success or failure by mailing us the verbose "
                          "output to flashrom@flashrom.org, thanks!\n");
                break;
        default:
                /* Should not happen. */
                internal_buses_supported = BUS_NONE;
                msg_pdbg("Flash bus type is unknown (none)\n");
                msg_pinfo("Something went wrong with bus type detection.\n");
                goto out_msg;
                break;
        }

        /* Force enable SPI and disable LPC? Not a good idea. */
#if 0
        val |= (1 << 6);
        val &= ~(1 << 5);
        rpci_write_byte(dev, 0x8a, val);
#endif

        if (mcp6x_spi_init(want_spi))
                ret = 1;

out_msg:
        msg_pinfo("Please send the output of \"flashrom -V\" to "
                  "flashrom@flashrom.org with\n"
                  "your board name: flashrom -V as the subject to help us "
                  "finish support for your\n"
                  "chipset. Thanks.\n");

        return ret;
}

static int enable_flash_ht1000(struct pci_dev *dev, const char *name)
{
        uint8_t val;

        /* Set the 4MB enable bit. */
        val = pci_read_byte(dev, 0x41);
        val |= 0x0e;
        rpci_write_byte(dev, 0x41, val);

        val = pci_read_byte(dev, 0x43);
        val |= (1 << 4);
        rpci_write_byte(dev, 0x43, val);

        return 0;
}

/*
 * Usually on the x86 architectures (and on other PC-like platforms like some
 * Alphas or Itanium) the system flash is mapped right below 4G. On the AMD
 * Elan SC520 only a small piece of the system flash is mapped there, but the
 * complete flash is mapped somewhere below 1G. The position can be determined
 * by the BOOTCS PAR register.
 */
static int get_flashbase_sc520(struct pci_dev *dev, const char *name)
{
        int i, bootcs_found = 0;
        uint32_t parx = 0;
        void *mmcr;

        /* 1. Map MMCR */
        mmcr = physmap("Elan SC520 MMCR", 0xfffef000, getpagesize());

        /* 2. Scan PAR0 (0x88) - PAR15 (0xc4) for
         *    BOOTCS region (PARx[31:29] = 100b)e
         */
        for (i = 0x88; i <= 0xc4; i += 4) {
                parx = mmio_readl(mmcr + i);
                if ((parx >> 29) == 4) {
                        bootcs_found = 1;
                        break; /* BOOTCS found */
                }
        }

        /* 3. PARx[25] = 1b --> flashbase[29:16] = PARx[13:0]
         *    PARx[25] = 0b --> flashbase[29:12] = PARx[17:0]
         */
        if (bootcs_found) {
                if (parx & (1 << 25)) {
                        parx &= (1 << 14) - 1; /* Mask [13:0] */
                        flashbase = parx << 16;
                } else {
                        parx &= (1 << 18) - 1; /* Mask [17:0] */
                        flashbase = parx << 12;
                }
        } else {
                msg_pinfo("AMD Elan SC520 detected, but no BOOTCS. "
                          "Assuming flash at 4G.\n");
        }

        /* 4. Clean up */
        physunmap(mmcr, getpagesize());
        return 0;
}

#endif

/* Please keep this list numerically sorted by vendor/device ID. */
const struct penable chipset_enables[] = {
#if defined(__i386__) || defined(__x86_64__)
        {0x1002, 0x4377, OK, "ATI", "SB400",            enable_flash_sb400},
        {0x1002, 0x438d, OK, "AMD", "SB600",            enable_flash_sb600},
        {0x1002, 0x439d, OK, "AMD", "SB700/SB710/SB750/SB850", enable_flash_sb600},
        {0x100b, 0x0510, NT, "AMD", "SC1100",           enable_flash_sc1100},
        {0x1022, 0x2080, OK, "AMD", "CS5536",           enable_flash_cs5536},
        {0x1022, 0x2090, OK, "AMD", "CS5536",           enable_flash_cs5536},
        {0x1022, 0x3000, OK, "AMD", "Elan SC520",       get_flashbase_sc520},
        {0x1022, 0x7440, OK, "AMD", "AMD-768",          enable_flash_amd8111},
        {0x1022, 0x7468, OK, "AMD", "AMD8111",          enable_flash_amd8111},
        {0x1022, 0x780e, OK, "AMD", "Hudson",           enable_flash_sb600},
        {0x1039, 0x0406, NT, "SiS", "501/5101/5501",    enable_flash_sis501},
        {0x1039, 0x0496, NT, "SiS", "85C496+497",       enable_flash_sis85c496},
        {0x1039, 0x0530, OK, "SiS", "530",              enable_flash_sis530},
        {0x1039, 0x0540, NT, "SiS", "540",              enable_flash_sis540},
        {0x1039, 0x0620, NT, "SiS", "620",              enable_flash_sis530},
        {0x1039, 0x0630, NT, "SiS", "630",              enable_flash_sis540},
        {0x1039, 0x0635, NT, "SiS", "635",              enable_flash_sis540},
        {0x1039, 0x0640, NT, "SiS", "640",              enable_flash_sis540},
        {0x1039, 0x0645, NT, "SiS", "645",              enable_flash_sis540},
        {0x1039, 0x0646, OK, "SiS", "645DX",            enable_flash_sis540},
        {0x1039, 0x0648, NT, "SiS", "648",              enable_flash_sis540},
        {0x1039, 0x0650, NT, "SiS", "650",              enable_flash_sis540},
        {0x1039, 0x0651, OK, "SiS", "651",              enable_flash_sis540},
        {0x1039, 0x0655, NT, "SiS", "655",              enable_flash_sis540},
        {0x1039, 0x0661, OK, "SiS", "661",              enable_flash_sis540},
        {0x1039, 0x0730, NT, "SiS", "730",              enable_flash_sis540},
        {0x1039, 0x0733, NT, "SiS", "733",              enable_flash_sis540},
        {0x1039, 0x0735, OK, "SiS", "735",              enable_flash_sis540},
        {0x1039, 0x0740, NT, "SiS", "740",              enable_flash_sis540},
        {0x1039, 0x0741, OK, "SiS", "741",              enable_flash_sis540},
        {0x1039, 0x0745, OK, "SiS", "745",              enable_flash_sis540},
        {0x1039, 0x0746, NT, "SiS", "746",              enable_flash_sis540},
        {0x1039, 0x0748, NT, "SiS", "748",              enable_flash_sis540},
        {0x1039, 0x0755, NT, "SiS", "755",              enable_flash_sis540},
        {0x1039, 0x5511, NT, "SiS", "5511",             enable_flash_sis5511},
        {0x1039, 0x5571, NT, "SiS", "5571",             enable_flash_sis530},
        {0x1039, 0x5591, NT, "SiS", "5591/5592",        enable_flash_sis530},
        {0x1039, 0x5596, NT, "SiS", "5596",             enable_flash_sis5511},
        {0x1039, 0x5597, NT, "SiS", "5597/5598/5581/5120", enable_flash_sis530},
        {0x1039, 0x5600, NT, "SiS", "600",              enable_flash_sis530},
        {0x1078, 0x0100, OK, "AMD", "CS5530(A)",        enable_flash_cs5530},
        {0x10b9, 0x1533, OK, "ALi", "M1533",            enable_flash_ali_m1533},
        {0x10de, 0x0030, OK, "NVIDIA", "nForce4/MCP4",  enable_flash_nvidia_nforce2},
        {0x10de, 0x0050, OK, "NVIDIA", "CK804",         enable_flash_ck804}, /* LPC */
        {0x10de, 0x0051, OK, "NVIDIA", "CK804",         enable_flash_ck804}, /* Pro */
        {0x10de, 0x0060, OK, "NVIDIA", "NForce2",       enable_flash_nvidia_nforce2},
        {0x10de, 0x00e0, OK, "NVIDIA", "NForce3",       enable_flash_nvidia_nforce2},
        /* Slave, should not be here, to fix known bug for A01. */
        {0x10de, 0x00d3, OK, "NVIDIA", "CK804",         enable_flash_ck804},
        {0x10de, 0x0260, OK, "NVIDIA", "MCP51",         enable_flash_ck804},
        {0x10de, 0x0261, NT, "NVIDIA", "MCP51",         enable_flash_ck804},
        {0x10de, 0x0262, NT, "NVIDIA", "MCP51",         enable_flash_ck804},
        {0x10de, 0x0263, NT, "NVIDIA", "MCP51",         enable_flash_ck804},
        {0x10de, 0x0360, OK, "NVIDIA", "MCP55",         enable_flash_mcp55}, /* M57SLI*/
        /* 10de:0361 is present in Tyan S2915 OEM systems, but not connected to
         * the flash chip. Instead, 10de:0364 is connected to the flash chip.
         * Until we have PCI device class matching or some fallback mechanism,
         * this is needed to get flashrom working on Tyan S2915 and maybe other
         * dual-MCP55 boards.
         */
#if 0
        {0x10de, 0x0361, NT, "NVIDIA", "MCP55",         enable_flash_mcp55}, /* LPC */
#endif
        {0x10de, 0x0362, OK, "NVIDIA", "MCP55",         enable_flash_mcp55}, /* LPC */
        {0x10de, 0x0363, OK, "NVIDIA", "MCP55",         enable_flash_mcp55}, /* LPC */
        {0x10de, 0x0364, OK, "NVIDIA", "MCP55",         enable_flash_mcp55}, /* LPC */
        {0x10de, 0x0365, OK, "NVIDIA", "MCP55",         enable_flash_mcp55}, /* LPC */
        {0x10de, 0x0366, OK, "NVIDIA", "MCP55",         enable_flash_mcp55}, /* LPC */
        {0x10de, 0x0367, OK, "NVIDIA", "MCP55",         enable_flash_mcp55}, /* Pro */
        {0x10de, 0x03e0, NT, "NVIDIA", "MCP61",         enable_flash_mcp6x_7x},
        {0x10de, 0x03e1, OK, "NVIDIA", "MCP61",         enable_flash_mcp6x_7x},
        {0x10de, 0x03e2, NT, "NVIDIA", "MCP61",         enable_flash_mcp6x_7x},
        {0x10de, 0x03e3, NT, "NVIDIA", "MCP61",         enable_flash_mcp6x_7x},
        {0x10de, 0x0440, NT, "NVIDIA", "MCP65",         enable_flash_mcp6x_7x},
        {0x10de, 0x0441, NT, "NVIDIA", "MCP65",         enable_flash_mcp6x_7x},
        {0x10de, 0x0442, NT, "NVIDIA", "MCP65",         enable_flash_mcp6x_7x},
        {0x10de, 0x0443, NT, "NVIDIA", "MCP65",         enable_flash_mcp6x_7x},
        {0x10de, 0x0548, OK, "NVIDIA", "MCP67",         enable_flash_mcp6x_7x},
        {0x10de, 0x075c, NT, "NVIDIA", "MCP78S",        enable_flash_mcp6x_7x},
        {0x10de, 0x075d, OK, "NVIDIA", "MCP78S",        enable_flash_mcp6x_7x},
        {0x10de, 0x07d7, NT, "NVIDIA", "MCP73",         enable_flash_mcp6x_7x},
        {0x10de, 0x0aac, NT, "NVIDIA", "MCP79",         enable_flash_mcp6x_7x},
        {0x10de, 0x0aad, NT, "NVIDIA", "MCP79",         enable_flash_mcp6x_7x},
        {0x10de, 0x0aae, NT, "NVIDIA", "MCP79",         enable_flash_mcp6x_7x},
        {0x10de, 0x0aaf, NT, "NVIDIA", "MCP79",         enable_flash_mcp6x_7x},
        /* VIA northbridges */
        {0x1106, 0x0585, NT, "VIA", "VT82C585VPX",      via_no_byte_merge},
        {0x1106, 0x0595, NT, "VIA", "VT82C595",         via_no_byte_merge},
        {0x1106, 0x0597, NT, "VIA", "VT82C597",         via_no_byte_merge},
        {0x1106, 0x0601, NT, "VIA", "VT8601/VT8601A",   via_no_byte_merge},
        {0x1106, 0x0691, NT, "VIA", "VT82C69x",         via_no_byte_merge}, /* 691, 693a, 694t, 694x checked */
        {0x1106, 0x8601, NT, "VIA", "VT8601T",          via_no_byte_merge},
        /* VIA southbridges */
        {0x1106, 0x0586, OK, "VIA", "VT82C586A/B",      enable_flash_amd8111},
        {0x1106, 0x0596, OK, "VIA", "VT82C596",         enable_flash_amd8111},
        {0x1106, 0x0686, NT, "VIA", "VT82C686A/B",      enable_flash_amd8111},
        {0x1106, 0x3074, OK, "VIA", "VT8233",           enable_flash_vt823x},
        {0x1106, 0x3147, OK, "VIA", "VT8233A",          enable_flash_vt823x},
        {0x1106, 0x3177, OK, "VIA", "VT8235",           enable_flash_vt823x},
        {0x1106, 0x3227, OK, "VIA", "VT8237",           enable_flash_vt823x},
        {0x1106, 0x3337, OK, "VIA", "VT8237A",          enable_flash_vt823x},
        {0x1106, 0x3372, OK, "VIA", "VT8237S",          enable_flash_vt8237s_spi},
        {0x1106, 0x8231, NT, "VIA", "VT8231",           enable_flash_vt823x},
        {0x1106, 0x8324, OK, "VIA", "CX700",            enable_flash_vt823x},
        {0x1106, 0x8353, OK, "VIA", "VX800/VX820",      enable_flash_vt8237s_spi},
        {0x1106, 0x8409, OK, "VIA", "VX855/VX875",      enable_flash_vt823x},
        {0x1166, 0x0200, OK, "Broadcom", "OSB4",        enable_flash_osb4},
        {0x1166, 0x0205, OK, "Broadcom", "HT-1000",     enable_flash_ht1000},
        {0x8086, 0x122e, OK, "Intel", "PIIX",           enable_flash_piix4},
        {0x8086, 0x1234, NT, "Intel", "MPIIX",          enable_flash_piix4},
        {0x8086, 0x1c44, OK, "Intel", "Z68",            enable_flash_pch6},
        {0x8086, 0x1c46, OK, "Intel", "P67",            enable_flash_pch6},
        {0x8086, 0x1c47, NT, "Intel", "UM67",           enable_flash_pch6},
        {0x8086, 0x1c49, NT, "Intel", "HM65",           enable_flash_pch6},
        {0x8086, 0x1c4a, OK, "Intel", "H67",            enable_flash_pch6},
        {0x8086, 0x1c4b, NT, "Intel", "HM67",           enable_flash_pch6},
        {0x8086, 0x1c4c, NT, "Intel", "Q65",            enable_flash_pch6},
        {0x8086, 0x1c4d, NT, "Intel", "QS67",           enable_flash_pch6},
        {0x8086, 0x1c4e, NT, "Intel", "Q67",            enable_flash_pch6},
        {0x8086, 0x1c4f, NT, "Intel", "QM67",           enable_flash_pch6},
        {0x8086, 0x1c50, NT, "Intel", "B65",            enable_flash_pch6},
        {0x8086, 0x1c52, NT, "Intel", "C202",           enable_flash_pch6},
        {0x8086, 0x1c54, NT, "Intel", "C204",           enable_flash_pch6},
        {0x8086, 0x1c56, NT, "Intel", "C206",           enable_flash_pch6},
        {0x8086, 0x1c5c, NT, "Intel", "H61",            enable_flash_pch6},
        {0x8086, 0x1d40, OK, "Intel", "X79",            enable_flash_ich10}, /* FIXME: when datasheet is available */
        {0x8086, 0x1d41, NT, "Intel", "X79",            enable_flash_ich10}, /* FIXME: when datasheet is available */
        {0x8086, 0x2410, OK, "Intel", "ICH",            enable_flash_ich_4e},
        {0x8086, 0x2420, OK, "Intel", "ICH0",           enable_flash_ich_4e},
        {0x8086, 0x2440, OK, "Intel", "ICH2",           enable_flash_ich_4e},
        {0x8086, 0x244c, OK, "Intel", "ICH2-M",         enable_flash_ich_4e},
        {0x8086, 0x2450, NT, "Intel", "C-ICH",          enable_flash_ich_4e},
        {0x8086, 0x2480, OK, "Intel", "ICH3-S",         enable_flash_ich_4e},
        {0x8086, 0x248c, OK, "Intel", "ICH3-M",         enable_flash_ich_4e},
        {0x8086, 0x24c0, OK, "Intel", "ICH4/ICH4-L",    enable_flash_ich_4e},
        {0x8086, 0x24cc, OK, "Intel", "ICH4-M",         enable_flash_ich_4e},
        {0x8086, 0x24d0, OK, "Intel", "ICH5/ICH5R",     enable_flash_ich_4e},
        {0x8086, 0x25a1, OK, "Intel", "6300ESB",        enable_flash_ich_4e},
        {0x8086, 0x2640, OK, "Intel", "ICH6/ICH6R",     enable_flash_ich_dc},
        {0x8086, 0x2641, OK, "Intel", "ICH6-M",         enable_flash_ich_dc},
        {0x8086, 0x2642, NT, "Intel", "ICH6W/ICH6RW",   enable_flash_ich_dc},
        {0x8086, 0x2670, OK, "Intel", "631xESB/632xESB/3100", enable_flash_ich_dc},
        {0x8086, 0x27b0, OK, "Intel", "ICH7DH",         enable_flash_ich7},
        {0x8086, 0x27b8, OK, "Intel", "ICH7/ICH7R",     enable_flash_ich7},
        {0x8086, 0x27b9, OK, "Intel", "ICH7M",          enable_flash_ich7},
        {0x8086, 0x27bc, OK, "Intel", "NM10",           enable_flash_ich7},
        {0x8086, 0x27bd, OK, "Intel", "ICH7MDH",        enable_flash_ich7},
        {0x8086, 0x2810, OK, "Intel", "ICH8/ICH8R",     enable_flash_ich8},
        {0x8086, 0x2811, OK, "Intel", "ICH8M-E",        enable_flash_ich8},
        {0x8086, 0x2812, OK, "Intel", "ICH8DH",         enable_flash_ich8},
        {0x8086, 0x2814, OK, "Intel", "ICH8DO",         enable_flash_ich8},
        {0x8086, 0x2815, OK, "Intel", "ICH8M",          enable_flash_ich8},
        {0x8086, 0x2910, OK, "Intel", "ICH9 Engineering Sample", enable_flash_ich9},
        {0x8086, 0x2912, OK, "Intel", "ICH9DH",         enable_flash_ich9},
        {0x8086, 0x2914, OK, "Intel", "ICH9DO",         enable_flash_ich9},
        {0x8086, 0x2916, OK, "Intel", "ICH9R",          enable_flash_ich9},
        {0x8086, 0x2917, OK, "Intel", "ICH9M-E",        enable_flash_ich9},
        {0x8086, 0x2918, OK, "Intel", "ICH9",           enable_flash_ich9},
        {0x8086, 0x2919, OK, "Intel", "ICH9M",          enable_flash_ich9},
        {0x8086, 0x3a10, NT, "Intel", "ICH10R Engineering Sample", enable_flash_ich10},
        {0x8086, 0x3a14, OK, "Intel", "ICH10DO",        enable_flash_ich10},
        {0x8086, 0x3a16, OK, "Intel", "ICH10R",         enable_flash_ich10},
        {0x8086, 0x3a18, OK, "Intel", "ICH10",          enable_flash_ich10},
        {0x8086, 0x3a1a, OK, "Intel", "ICH10D",         enable_flash_ich10},
        {0x8086, 0x3a1e, NT, "Intel", "ICH10 Engineering Sample", enable_flash_ich10},
        {0x8086, 0x3b00, NT, "Intel", "3400 Desktop",   enable_flash_pch5},
        {0x8086, 0x3b01, NT, "Intel", "3400 Mobile",    enable_flash_pch5},
        {0x8086, 0x3b02, NT, "Intel", "P55",            enable_flash_pch5},
        {0x8086, 0x3b03, NT, "Intel", "PM55",           enable_flash_pch5},
        {0x8086, 0x3b06, OK, "Intel", "H55",            enable_flash_pch5},
        {0x8086, 0x3b07, OK, "Intel", "QM57",           enable_flash_pch5},
        {0x8086, 0x3b08, NT, "Intel", "H57",            enable_flash_pch5},
        {0x8086, 0x3b09, NT, "Intel", "HM55",           enable_flash_pch5},
        {0x8086, 0x3b0a, NT, "Intel", "Q57",            enable_flash_pch5},
        {0x8086, 0x3b0b, NT, "Intel", "HM57",           enable_flash_pch5},
        {0x8086, 0x3b0d, NT, "Intel", "3400 Mobile SFF", enable_flash_pch5},
        {0x8086, 0x3b0e, NT, "Intel", "B55",            enable_flash_pch5},
        {0x8086, 0x3b0f, OK, "Intel", "QS57",           enable_flash_pch5},
        {0x8086, 0x3b12, NT, "Intel", "3400",           enable_flash_pch5},
        {0x8086, 0x3b14, NT, "Intel", "3420",           enable_flash_pch5},
        {0x8086, 0x3b16, NT, "Intel", "3450",           enable_flash_pch5},
        {0x8086, 0x3b1e, NT, "Intel", "B55",            enable_flash_pch5},
        {0x8086, 0x5031, OK, "Intel", "EP80579",        enable_flash_ich7},
        {0x8086, 0x7000, OK, "Intel", "PIIX3",          enable_flash_piix4},
        {0x8086, 0x7110, OK, "Intel", "PIIX4/4E/4M",    enable_flash_piix4},
        {0x8086, 0x7198, OK, "Intel", "440MX",          enable_flash_piix4},
        {0x8086, 0x8119, OK, "Intel", "SCH Poulsbo",    enable_flash_poulsbo},
        {0x8086, 0x8186, OK, "Intel", "Atom E6xx(T)/Tunnel Creek", enable_flash_tunnelcreek},
#endif
        {},
};

int chipset_flash_enable(void)
{
        struct pci_dev *dev = NULL;
        int ret = -2;           /* Nothing! */
        int i;

        /* Now let's try to find the chipset we have... */
        for (i = 0; chipset_enables[i].vendor_name != NULL; i++) {
                dev = pci_dev_find(chipset_enables[i].vendor_id,
                                   chipset_enables[i].device_id);
                if (!dev)
                        continue;
                if (ret != -2) {
                        msg_pinfo("WARNING: unexpected second chipset match: "
                                    "\"%s %s\"\n"
                                  "ignoring, please report lspci and board URL "
                                    "to flashrom@flashrom.org\n"
                                  "with \'CHIPSET: your board name\' in the "
                                    "subject line.\n",
                                chipset_enables[i].vendor_name,
                                        chipset_enables[i].device_name);
                        continue;
                }
                msg_pinfo("Found chipset \"%s %s\"",
                          chipset_enables[i].vendor_name,
                          chipset_enables[i].device_name);
                msg_pdbg(" with PCI ID %04x:%04x",
                         chipset_enables[i].vendor_id,
                         chipset_enables[i].device_id);
                msg_pinfo(". ");

                if (chipset_enables[i].status == NT) {
                        msg_pinfo("\nThis chipset is marked as untested. If "
                                  "you are using an up-to-date version\nof "
                                  "flashrom please email a report to "
                                  "flashrom@flashrom.org including a\nverbose "
                                  "(-V) log. Thank you!\n");
                }
                msg_pinfo("Enabling flash write... ");
                ret = chipset_enables[i].doit(dev,
                                              chipset_enables[i].device_name);
                if (ret == NOT_DONE_YET) {
                        ret = -2;
                        msg_pinfo("OK - searching further chips.\n");
                } else if (ret < 0)
                        msg_pinfo("FAILED!\n");
                else if (ret == 0)
                        msg_pinfo("OK.\n");
                else if (ret == ERROR_NONFATAL)
                        msg_pinfo("PROBLEMS, continuing anyway\n");
                if (ret == ERROR_FATAL) {
                        msg_perr("FATAL ERROR!\n");
                        return ret;
                }
        }

        return ret;
}