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    SubjectStandard driver call to enable/disable PCI ROM
    I needed to enable a PCI ROM and read a few things
    from it, and then disable it again. It might be worth
    adding a standard PCI API in 2.6 for this.

    Here's the code I used...

    static void * __init aty128_map_ROM(struct pci_dev
    *dev, const struct aty128fb_par
    *par)
    {
    void *rom;
    struct resource *r =
    &dev->resource[PCI_ROM_RESOURCE];

    /* assign address if it doesn't have one */
    if (r->start == 0)
    pci_assign_resource(dev,
    PCI_ROM_RESOURCE);

    /* enable if needed */
    if (!(r->flags & PCI_ROM_ADDRESS_ENABLE)) {
    pci_write_config_dword(dev,
    dev->rom_base_reg, r->start |
    PCI_ROM_ADDRESS_ENABLE);
    r->flags |= PCI_ROM_ADDRESS_ENABLE;
    }
    rom = ioremap(r->start, r->end - r->start + 1);
    if (!rom) {
    printk(KERN_ERR "aty128fb: ROM failed to map\n");
    return NULL;
    }
    /* Very simple test to make sure it appeared */
    if (readb(rom) != 0x55) {
    printk(KERN_ERR "aty128fb: Invalid ROM
    signature %x should be 0x55\n",
    readb(rom));
    aty128_unmap_ROM(dev, rom);
    return NULL;
    }
    return rom;
    }

    static void __init aty128_unmap_ROM(struct pci_dev
    *dev,
    void * rom)
    {
    /* leave it disabled and unassigned */
    struct resource *r =
    &dev->resource[PCI_ROM_RESOURCE];

    iounmap(rom);

    r->flags &= ~PCI_ROM_ADDRESS_ENABLE;
    r->end -= r->start;
    r->start = 0;
    /* This will disable and set address to unassigned
    */
    pci_write_config_dword(dev, dev->rom_base_reg, 0);
    release_resource(r);
    }


    =====
    Jon Smirl
    jonsmirl@yahoo.com

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