// 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);