pci-dreamcast.c

Go to the documentation of this file.

/*
 * PCI support for the Sega Dreamcast
 *
 * Copyright (C) 2001, 2002  M. R. Brown
 * Copyright (C) 2002, 2003  Paul Mundt
 *
 * This file originally bore the message (with enclosed-$):
 *  Id: pci.c,v 1.3 2003/05/04 19:29:46 lethal Exp
 *  Dreamcast PCI: Supports SEGA Broadband Adaptor only.
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 */

#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/param.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/pci.h>
#include <linux/module.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <mach/pci.h>

static struct resource gapspci_resources[] = {
    {
        .name   = "GAPSPCI IO",
        .start  = GAPSPCI_BBA_CONFIG,
        .end    = GAPSPCI_BBA_CONFIG + GAPSPCI_BBA_CONFIG_SIZE - 1,
        .flags  = IORESOURCE_IO,
    },  {
        .name   = "GAPSPCI mem",
        .start  = GAPSPCI_DMA_BASE,
        .end    = GAPSPCI_DMA_BASE + GAPSPCI_DMA_SIZE - 1,
        .flags  = IORESOURCE_MEM,
    },
};

static struct pci_channel dreamcast_pci_controller = {
    .pci_ops    = &gapspci_pci_ops,
    .resources  = gapspci_resources,
    .nr_resources   = ARRAY_SIZE(gapspci_resources),
    .io_offset  = 0x00000000,
    .mem_offset = 0x00000000,
};

/*
 * gapspci init
 */

static int __init gapspci_init(void)
{
    char idbuf[16];
    int i;

    /*
     * FIXME: All of this wants documenting to some degree,
     * even some basic register definitions would be nice.
     *
     * I haven't seen anything this ugly since.. maple.
     */

    for (i=0; i<16; i++)
        idbuf[i] = inb(GAPSPCI_REGS+i);

    if (strncmp(idbuf, "GAPSPCI_BRIDGE_2", 16))
        return -ENODEV;

    outl(0x5a14a501, GAPSPCI_REGS+0x18);

    for (i=0; i<1000000; i++)
        cpu_relax();

    if (inl(GAPSPCI_REGS+0x18) != 1)
        return -EINVAL;

    outl(0x01000000, GAPSPCI_REGS+0x20);
    outl(0x01000000, GAPSPCI_REGS+0x24);

    outl(GAPSPCI_DMA_BASE, GAPSPCI_REGS+0x28);
    outl(GAPSPCI_DMA_BASE+GAPSPCI_DMA_SIZE, GAPSPCI_REGS+0x2c);

    outl(1, GAPSPCI_REGS+0x14);
    outl(1, GAPSPCI_REGS+0x34);

    /* Setting Broadband Adapter */
    outw(0xf900, GAPSPCI_BBA_CONFIG+0x06);
    outl(0x00000000, GAPSPCI_BBA_CONFIG+0x30);
    outb(0x00, GAPSPCI_BBA_CONFIG+0x3c);
    outb(0xf0, GAPSPCI_BBA_CONFIG+0x0d);
    outw(0x0006, GAPSPCI_BBA_CONFIG+0x04);
    outl(0x00002001, GAPSPCI_BBA_CONFIG+0x10);
    outl(0x01000000, GAPSPCI_BBA_CONFIG+0x14);

    return register_pci_controller(&dreamcast_pci_controller);
}
arch_initcall(gapspci_init);