cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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pci-dreamcast.c (2339B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * PCI support for the Sega Dreamcast
      4 *
      5 * Copyright (C) 2001, 2002  M. R. Brown
      6 * Copyright (C) 2002, 2003  Paul Mundt
      7 *
      8 * This file originally bore the message (with enclosed-$):
      9 *	Id: pci.c,v 1.3 2003/05/04 19:29:46 lethal Exp
     10 *	Dreamcast PCI: Supports SEGA Broadband Adaptor only.
     11 */
     12
     13#include <linux/sched.h>
     14#include <linux/kernel.h>
     15#include <linux/param.h>
     16#include <linux/interrupt.h>
     17#include <linux/init.h>
     18#include <linux/irq.h>
     19#include <linux/pci.h>
     20#include <linux/module.h>
     21#include <asm/io.h>
     22#include <asm/irq.h>
     23#include <mach/pci.h>
     24
     25static struct resource gapspci_resources[] = {
     26	{
     27		.name	= "GAPSPCI IO",
     28		.start	= GAPSPCI_BBA_CONFIG,
     29		.end	= GAPSPCI_BBA_CONFIG + GAPSPCI_BBA_CONFIG_SIZE - 1,
     30		.flags	= IORESOURCE_IO,
     31	},  {
     32		.name	= "GAPSPCI mem",
     33		.start	= GAPSPCI_DMA_BASE,
     34		.end	= GAPSPCI_DMA_BASE + GAPSPCI_DMA_SIZE - 1,
     35		.flags	= IORESOURCE_MEM,
     36	},
     37};
     38
     39static struct pci_channel dreamcast_pci_controller = {
     40	.pci_ops	= &gapspci_pci_ops,
     41	.resources	= gapspci_resources,
     42	.nr_resources	= ARRAY_SIZE(gapspci_resources),
     43	.io_offset	= 0x00000000,
     44	.mem_offset	= 0x00000000,
     45};
     46
     47/*
     48 * gapspci init
     49 */
     50
     51static int __init gapspci_init(void)
     52{
     53	char idbuf[16];
     54	int i;
     55
     56	/*
     57	 * FIXME: All of this wants documenting to some degree,
     58	 * even some basic register definitions would be nice.
     59	 *
     60	 * I haven't seen anything this ugly since.. maple.
     61	 */
     62
     63	for (i=0; i<16; i++)
     64		idbuf[i] = inb(GAPSPCI_REGS+i);
     65
     66	if (strncmp(idbuf, "GAPSPCI_BRIDGE_2", 16))
     67		return -ENODEV;
     68
     69	outl(0x5a14a501, GAPSPCI_REGS+0x18);
     70
     71	for (i=0; i<1000000; i++)
     72		cpu_relax();
     73
     74	if (inl(GAPSPCI_REGS+0x18) != 1)
     75		return -EINVAL;
     76
     77	outl(0x01000000, GAPSPCI_REGS+0x20);
     78	outl(0x01000000, GAPSPCI_REGS+0x24);
     79
     80	outl(GAPSPCI_DMA_BASE, GAPSPCI_REGS+0x28);
     81	outl(GAPSPCI_DMA_BASE+GAPSPCI_DMA_SIZE, GAPSPCI_REGS+0x2c);
     82
     83	outl(1, GAPSPCI_REGS+0x14);
     84	outl(1, GAPSPCI_REGS+0x34);
     85
     86	/* Setting Broadband Adapter */
     87	outw(0xf900, GAPSPCI_BBA_CONFIG+0x06);
     88	outl(0x00000000, GAPSPCI_BBA_CONFIG+0x30);
     89	outb(0x00, GAPSPCI_BBA_CONFIG+0x3c);
     90	outb(0xf0, GAPSPCI_BBA_CONFIG+0x0d);
     91	outw(0x0006, GAPSPCI_BBA_CONFIG+0x04);
     92	outl(0x00002001, GAPSPCI_BBA_CONFIG+0x10);
     93	outl(0x01000000, GAPSPCI_BBA_CONFIG+0x14);
     94
     95	return register_pci_controller(&dreamcast_pci_controller);
     96}
     97arch_initcall(gapspci_init);