98 lines
2.3 KiB
C
98 lines
2.3 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* PCI support for the Sega Dreamcast
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*
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* Copyright (C) 2001, 2002 M. R. Brown
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* Copyright (C) 2002, 2003 Paul Mundt
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*
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* This file originally bore the message (with enclosed-$):
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* Id: pci.c,v 1.3 2003/05/04 19:29:46 lethal Exp
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* Dreamcast PCI: Supports SEGA Broadband Adaptor only.
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*/
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/param.h>
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#include <linux/interrupt.h>
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#include <linux/init.h>
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#include <linux/irq.h>
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#include <linux/pci.h>
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#include <linux/module.h>
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#include <asm/io.h>
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#include <asm/irq.h>
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#include <mach/pci.h>
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static struct resource gapspci_resources[] = {
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{
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.name = "GAPSPCI IO",
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.start = GAPSPCI_BBA_CONFIG,
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.end = GAPSPCI_BBA_CONFIG + GAPSPCI_BBA_CONFIG_SIZE - 1,
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.flags = IORESOURCE_IO,
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}, {
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.name = "GAPSPCI mem",
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.start = GAPSPCI_DMA_BASE,
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.end = GAPSPCI_DMA_BASE + GAPSPCI_DMA_SIZE - 1,
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.flags = IORESOURCE_MEM,
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},
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};
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static struct pci_channel dreamcast_pci_controller = {
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.pci_ops = &gapspci_pci_ops,
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.resources = gapspci_resources,
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.nr_resources = ARRAY_SIZE(gapspci_resources),
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.io_offset = 0x00000000,
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.mem_offset = 0x00000000,
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};
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/*
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* gapspci init
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*/
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static int __init gapspci_init(void)
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{
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char idbuf[16];
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int i;
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/*
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* FIXME: All of this wants documenting to some degree,
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* even some basic register definitions would be nice.
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*
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* I haven't seen anything this ugly since.. maple.
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*/
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for (i=0; i<16; i++)
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idbuf[i] = inb(GAPSPCI_REGS+i);
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if (strncmp(idbuf, "GAPSPCI_BRIDGE_2", 16))
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return -ENODEV;
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outl(0x5a14a501, GAPSPCI_REGS+0x18);
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for (i=0; i<1000000; i++)
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cpu_relax();
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if (inl(GAPSPCI_REGS+0x18) != 1)
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return -EINVAL;
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outl(0x01000000, GAPSPCI_REGS+0x20);
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outl(0x01000000, GAPSPCI_REGS+0x24);
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outl(GAPSPCI_DMA_BASE, GAPSPCI_REGS+0x28);
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outl(GAPSPCI_DMA_BASE+GAPSPCI_DMA_SIZE, GAPSPCI_REGS+0x2c);
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outl(1, GAPSPCI_REGS+0x14);
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outl(1, GAPSPCI_REGS+0x34);
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/* Setting Broadband Adapter */
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outw(0xf900, GAPSPCI_BBA_CONFIG+0x06);
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outl(0x00000000, GAPSPCI_BBA_CONFIG+0x30);
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outb(0x00, GAPSPCI_BBA_CONFIG+0x3c);
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outb(0xf0, GAPSPCI_BBA_CONFIG+0x0d);
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outw(0x0006, GAPSPCI_BBA_CONFIG+0x04);
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outl(0x00002001, GAPSPCI_BBA_CONFIG+0x10);
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outl(0x01000000, GAPSPCI_BBA_CONFIG+0x14);
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return register_pci_controller(&dreamcast_pci_controller);
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}
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arch_initcall(gapspci_init);
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