Subversion Repositories HelenOS

/*

 *  The PCI Library -- Direct Configuration access via i386 Ports

 *

 *  Copyright (c) 1997--2004 Martin Mares <mj@ucw.cz>

 *

 *  May 8, 2006 - Modified and ported to HelenOS by Jakub Jermar.

 *

 *  Can be freely distributed and used under the terms of the GNU GPL.

 */

#include <unistd.h>

#include "internal.h"

static inline void outb(u8 b, u16 port)

{

    asm volatile ("outb %0, %1\n" :: "a" (b), "d" (port));

}

static inline void outw(u16 w, u16 port)

{

    asm volatile ("outw %0, %1\n" :: "a" (w), "d" (port));

}

static inline void outl(u32 l, u16 port)

{

    asm volatile ("outl %0, %1\n" :: "a" (l), "d" (port));

}

static inline u8 inb(u16 port)

{

    u8 val;

    asm volatile ("inb %1, %0 \n" : "=a" (val) : "d"(port));

    return val;

}

static inline u16 inw(u16 port)

{

    u16 val;

    asm volatile ("inw %1, %0 \n" : "=a" (val) : "d"(port));

    return val;

}

static inline u32 inl(u16 port)

{

    u32 val;

    asm volatile ("inl %1, %0 \n" : "=a" (val) : "d"(port));

    return val;

}

static void conf12_init(struct pci_access *a)

{

}

static void conf12_cleanup(struct pci_access *a UNUSED)

{

}

/*

 * Before we decide to use direct hardware access mechanisms, we try to do some

 * trivial checks to ensure it at least _seems_ to be working -- we just test

 * whether bus 00 contains a host bridge (this is similar to checking

 * techniques used in XFree86, but ours should be more reliable since we

 * attempt to make use of direct access hints provided by the PCI BIOS).

 *

 * This should be close to trivial, but it isn't, because there are buggy

 * chipsets (yes, you guessed it, by Intel and Compaq) that have no class ID.

 */

static int intel_sanity_check(struct pci_access *a, struct pci_methods *m)

{

    struct pci_dev d;

    a->debug("...sanity check");

    d.bus = 0;

    d.func = 0;

    for (d.dev = 0; d.dev < 32; d.dev++) {

        u16 class, vendor;

        if ((m->read(&d, PCI_CLASS_DEVICE, (byte *) & class,

             sizeof(class))

            && (class == cpu_to_le16(PCI_CLASS_BRIDGE_HOST)

            || class == cpu_to_le16(PCI_CLASS_DISPLAY_VGA)))

            || (m->read(&d, PCI_VENDOR_ID, (byte *) & vendor,

                   sizeof(vendor))

            && (vendor == cpu_to_le16(PCI_VENDOR_ID_INTEL)

            || vendor == cpu_to_le16(PCI_VENDOR_ID_COMPAQ)))) {

            a->debug("...outside the Asylum at 0/%02x/0",

                 d.dev);

            return 1;

        }

    }

    a->debug("...insane");

    return 0;

}

/*

 *  Configuration type 1

 */

#define CONFIG_CMD(bus, device_fn, where)   (0x80000000 | (bus << 16) | (device_fn << 8) | (where & ~3))

static int conf1_detect(struct pci_access *a)

{

    unsigned int tmp;

    int res = 0;

    outb(0x01, 0xCFB);

    tmp = inl(0xCF8);

    outl(0x80000000, 0xCF8);

    if (inl(0xCF8) == 0x80000000)

        res = 1;

    outl(tmp, 0xCF8);

    if (res)

        res = intel_sanity_check(a, &pm_intel_conf1);

    return res;

}

static int conf1_read(struct pci_dev *d, int pos, byte * buf, int len)

{

    int addr = 0xcfc + (pos & 3);

    if (pos >= 256)

        return 0;

    outl(0x80000000 | ((d->bus & 0xff) << 16) |

         (PCI_DEVFN(d->dev, d->func) << 8) | (pos & ~3), 0xcf8);

    switch (len) {

    case 1:

        buf[0] = inb(addr);

        break;

    case 2:

        ((u16 *) buf)[0] = cpu_to_le16(inw(addr));

        break;

    case 4:

        ((u32 *) buf)[0] = cpu_to_le32(inl(addr));

        break;

    default:

        return pci_generic_block_read(d, pos, buf, len);

    }

    return 1;

}

static int conf1_write(struct pci_dev *d, int pos, byte * buf, int len)

{

    int addr = 0xcfc + (pos & 3);

    if (pos >= 256)

        return 0;

    outl(0x80000000 | ((d->bus & 0xff) << 16) |

         (PCI_DEVFN(d->dev, d->func) << 8) | (pos & ~3), 0xcf8);

    switch (len) {

    case 1:

        outb(buf[0], addr);

        break;

    case 2:

        outw(le16_to_cpu(((u16 *) buf)[0]), addr);

        break;

    case 4:

        outl(le32_to_cpu(((u32 *) buf)[0]), addr);

        break;

    default:

        return pci_generic_block_write(d, pos, buf, len);

    }

    return 1;

}

/*

 *  Configuration type 2. Obsolete and brain-damaged, but existing.

 */

static int conf2_detect(struct pci_access *a)

{

    /* This is ugly and tends to produce false positives. Beware. */

    outb(0x00, 0xCFB);

    outb(0x00, 0xCF8);

    outb(0x00, 0xCFA);

    if (inb(0xCF8) == 0x00 && inb(0xCFA) == 0x00)

        return intel_sanity_check(a, &pm_intel_conf2);

    else

        return 0;

}

static int conf2_read(struct pci_dev *d, int pos, byte * buf, int len)

{

    int addr = 0xc000 | (d->dev << 8) | pos;

    if (pos >= 256)

        return 0;

    if (d->dev >= 16)

        /* conf2 supports only 16 devices per bus */

        return 0;

    outb((d->func << 1) | 0xf0, 0xcf8);

    outb(d->bus, 0xcfa);

    switch (len) {

    case 1:

        buf[0] = inb(addr);

        break;

    case 2:

        ((u16 *) buf)[0] = cpu_to_le16(inw(addr));

        break;

    case 4:

        ((u32 *) buf)[0] = cpu_to_le32(inl(addr));

        break;

    default:

        outb(0, 0xcf8);

        return pci_generic_block_read(d, pos, buf, len);

    }

    outb(0, 0xcf8);

    return 1;

}

static int conf2_write(struct pci_dev *d, int pos, byte * buf, int len)

{

    int addr = 0xc000 | (d->dev << 8) | pos;

    if (pos >= 256)

        return 0;

    if (d->dev >= 16)

        d->access->error("conf2_write: only first 16 devices exist.");

    outb((d->func << 1) | 0xf0, 0xcf8);

    outb(d->bus, 0xcfa);

    switch (len) {

    case 1:

        outb(buf[0], addr);

        break;

    case 2:

        outw(le16_to_cpu(*(u16 *) buf), addr);

        break;

    case 4:

        outl(le32_to_cpu(*(u32 *) buf), addr);

        break;

    default:

        outb(0, 0xcf8);

        return pci_generic_block_write(d, pos, buf, len);

    }

    outb(0, 0xcf8);

    return 1;

}

struct pci_methods pm_intel_conf1 = {

    "Intel-conf1",

    NULL,           /* config */

    conf1_detect,

    conf12_init,

    conf12_cleanup,

    pci_generic_scan,

    pci_generic_fill_info,

    conf1_read,

    conf1_write,

    NULL,           /* init_dev */

    NULL            /* cleanup_dev */

};

struct pci_methods pm_intel_conf2 = {

    "Intel-conf2",

    NULL,           /* config */

    conf2_detect,

    conf12_init,

    conf12_cleanup,

    pci_generic_scan,

    pci_generic_fill_info,

    conf2_read,

    conf2_write,

    NULL,           /* init_dev */

    NULL            /* cleanup_dev */

};