arch/sh/drivers/pci/pci-dreamcast.c

   1 /*
   2  * PCI support for the Sega Dreamcast
   3  *
   4  * Copyright (C) 2001, 2002  M. R. Brown
   5  * Copyright (C) 2002, 2003  Paul Mundt
   6  *
   7  * This file originally bore the message (with enclosed-$):
   8  *      Id: pci.c,v 1.3 2003/05/04 19:29:46 lethal Exp
   9  *      Dreamcast PCI: Supports SEGA Broadband Adaptor only.
  10  *
  11  * This file is subject to the terms and conditions of the GNU General Public
  12  * License.  See the file "COPYING" in the main directory of this archive
  13  * for more details.
  14  */
  15
  16 #include <linux/sched.h>
  17 #include <linux/kernel.h>
  18 #include <linux/param.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/init.h>
  21 #include <linux/irq.h>
  22 #include <linux/pci.h>
  23 #include <linux/module.h>
  24 #include <asm/io.h>
  25 #include <asm/irq.h>
  26 #include <mach/pci.h>
  27
  28 static struct resource gapspci_resources[] = {
  29         {
  30                 .name   = "GAPSPCI IO",
  31                 .start  = GAPSPCI_BBA_CONFIG,
  32                 .end    = GAPSPCI_BBA_CONFIG + GAPSPCI_BBA_CONFIG_SIZE - 1,
  33                 .flags  = IORESOURCE_IO,
  34         },  {
  35                 .name   = "GAPSPCI mem",
  36                 .start  = GAPSPCI_DMA_BASE,
  37                 .end    = GAPSPCI_DMA_BASE + GAPSPCI_DMA_SIZE - 1,
  38                 .flags  = IORESOURCE_MEM,
  39         },
  40 };
  41
  42 static struct pci_channel dreamcast_pci_controller = {
  43         .pci_ops        = &gapspci_pci_ops,
  44         .resources      = gapspci_resources,
  45         .nr_resources   = ARRAY_SIZE(gapspci_resources),
  46         .io_offset      = 0x00000000,
  47         .mem_offset     = 0x00000000,
  48 };
  49
  50 /*
  51  * gapspci init
  52  */
  53
  54 static int __init gapspci_init(void)
  55 {
  56         char idbuf[16];
  57         int i;
  58
  59         /*
  60          * FIXME: All of this wants documenting to some degree,
  61          * even some basic register definitions would be nice.
  62          *
  63          * I haven't seen anything this ugly since.. maple.
  64          */
  65
  66         for (i=0; i<16; i++)
  67                 idbuf[i] = inb(GAPSPCI_REGS+i);
  68
  69         if (strncmp(idbuf, "GAPSPCI_BRIDGE_2", 16))
  70                 return -ENODEV;
  71
  72         outl(0x5a14a501, GAPSPCI_REGS+0x18);
  73
  74         for (i=0; i<1000000; i++)
  75                 cpu_relax();
  76
  77         if (inl(GAPSPCI_REGS+0x18) != 1)
  78                 return -EINVAL;
  79
  80         outl(0x01000000, GAPSPCI_REGS+0x20);
  81         outl(0x01000000, GAPSPCI_REGS+0x24);
  82
  83         outl(GAPSPCI_DMA_BASE, GAPSPCI_REGS+0x28);
  84         outl(GAPSPCI_DMA_BASE+GAPSPCI_DMA_SIZE, GAPSPCI_REGS+0x2c);
  85
  86         outl(1, GAPSPCI_REGS+0x14);
  87         outl(1, GAPSPCI_REGS+0x34);
  88
  89         /* Setting Broadband Adapter */
  90         outw(0xf900, GAPSPCI_BBA_CONFIG+0x06);
  91         outl(0x00000000, GAPSPCI_BBA_CONFIG+0x30);
  92         outb(0x00, GAPSPCI_BBA_CONFIG+0x3c);
  93         outb(0xf0, GAPSPCI_BBA_CONFIG+0x0d);
  94         outw(0x0006, GAPSPCI_BBA_CONFIG+0x04);
  95         outl(0x00002001, GAPSPCI_BBA_CONFIG+0x10);
  96         outl(0x01000000, GAPSPCI_BBA_CONFIG+0x14);
  97
  98         return register_pci_controller(&dreamcast_pci_controller);
  99 }
 100 arch_initcall(gapspci_init);