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// SPDX-License-Identifier: GPL-2.0
/*
* 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.
*/
#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);
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