l440gx.c

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/*
 * BIOS Flash chip on Intel 440GX board.
 *
 * Bugs this currently does not work under linuxBIOS.
 */

#include <linux/module.h>
#include <linux/pci.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <asm/io.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/map.h>

#define PIIXE_IOBASE_RESOURCE   11

#define WINDOW_ADDR 0xfff00000
#define WINDOW_SIZE 0x00100000
#define BUSWIDTH 1

static u32 iobase;
#define IOBASE iobase
#define TRIBUF_PORT (IOBASE+0x37)
#define VPP_PORT (IOBASE+0x28)

static struct mtd_info *mymtd;


/* Is this really the vpp port? */
static DEFINE_SPINLOCK(l440gx_vpp_lock);
static int l440gx_vpp_refcnt;
static void l440gx_set_vpp(struct map_info *map, int vpp)
{
    unsigned long flags;

    spin_lock_irqsave(&l440gx_vpp_lock, flags);
    if (vpp) {
        if (++l440gx_vpp_refcnt == 1)   /* first nested 'on' */
            outl(inl(VPP_PORT) | 1, VPP_PORT);
    } else {
        if (--l440gx_vpp_refcnt == 0)   /* last nested 'off' */
            outl(inl(VPP_PORT) & ~1, VPP_PORT);
    }
    spin_unlock_irqrestore(&l440gx_vpp_lock, flags);
}

static struct map_info l440gx_map = {
    .name = "L440GX BIOS",
    .size = WINDOW_SIZE,
    .bankwidth = BUSWIDTH,
    .phys = WINDOW_ADDR,
#if 0
    /* FIXME verify that this is the
     * appripriate code for vpp enable/disable
     */
    .set_vpp = l440gx_set_vpp
#endif
};

static int __init init_l440gx(void)
{
    struct pci_dev *dev, *pm_dev;
    struct resource *pm_iobase;
    __u16 word;

    dev = pci_get_device(PCI_VENDOR_ID_INTEL,
        PCI_DEVICE_ID_INTEL_82371AB_0, NULL);

    pm_dev = pci_get_device(PCI_VENDOR_ID_INTEL,
        PCI_DEVICE_ID_INTEL_82371AB_3, NULL);

    pci_dev_put(dev);

    if (!dev || !pm_dev) {
        printk(KERN_NOTICE "L440GX flash mapping: failed to find PIIX4 ISA bridge, cannot continue\n");
        pci_dev_put(pm_dev);
        return -ENODEV;
    }

    l440gx_map.virt = ioremap_nocache(WINDOW_ADDR, WINDOW_SIZE);

    if (!l440gx_map.virt) {
        printk(KERN_WARNING "Failed to ioremap L440GX flash region\n");
        pci_dev_put(pm_dev);
        return -ENOMEM;
    }
    simple_map_init(&l440gx_map);
    printk(KERN_NOTICE "window_addr = 0x%08lx\n", (unsigned long)l440gx_map.virt);

    /* Setup the pm iobase resource
     * This code should move into some kind of generic bridge
     * driver but for the moment I'm content with getting the
     * allocation correct.
     */
    pm_iobase = &pm_dev->resource[PIIXE_IOBASE_RESOURCE];
    if (!(pm_iobase->flags & IORESOURCE_IO)) {
        pm_iobase->name = "pm iobase";
        pm_iobase->start = 0;
        pm_iobase->end = 63;
        pm_iobase->flags = IORESOURCE_IO;

        /* Put the current value in the resource */
        pci_read_config_dword(pm_dev, 0x40, &iobase);
        iobase &= ~1;
        pm_iobase->start += iobase & ~1;
        pm_iobase->end += iobase & ~1;

        pci_dev_put(pm_dev);

        /* Allocate the resource region */
        if (pci_assign_resource(pm_dev, PIIXE_IOBASE_RESOURCE) != 0) {
            pci_dev_put(dev);
            pci_dev_put(pm_dev);
            printk(KERN_WARNING "Could not allocate pm iobase resource\n");
            iounmap(l440gx_map.virt);
            return -ENXIO;
        }
    }
    /* Set the iobase */
    iobase = pm_iobase->start;
    pci_write_config_dword(pm_dev, 0x40, iobase | 1);


    /* Set XBCS# */
    pci_read_config_word(dev, 0x4e, &word);
    word |= 0x4;
        pci_write_config_word(dev, 0x4e, word);

    /* Supply write voltage to the chip */
    l440gx_set_vpp(&l440gx_map, 1);

    /* Enable the gate on the WE line */
    outb(inb(TRIBUF_PORT) & ~1, TRIBUF_PORT);

        printk(KERN_NOTICE "Enabled WE line to L440GX BIOS flash chip.\n");

    mymtd = do_map_probe("jedec_probe", &l440gx_map);
    if (!mymtd) {
        printk(KERN_NOTICE "JEDEC probe on BIOS chip failed. Using ROM\n");
        mymtd = do_map_probe("map_rom", &l440gx_map);
    }
    if (mymtd) {
        mymtd->owner = THIS_MODULE;

        mtd_device_register(mymtd, NULL, 0);
        return 0;
    }

    iounmap(l440gx_map.virt);
    return -ENXIO;
}

static void __exit cleanup_l440gx(void)
{
    mtd_device_unregister(mymtd);
    map_destroy(mymtd);

    iounmap(l440gx_map.virt);
}

module_init(init_l440gx);
module_exit(cleanup_l440gx);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("David Woodhouse <[email protected]>");
MODULE_DESCRIPTION("MTD map driver for BIOS chips on Intel L440GX motherboards");