sys/arch/prep/stand/boot/io.c

   1 /*      $NetBSD: io.c,v 1.3 2006/04/13 18:46:46 garbled Exp $   */
   2
   3 /*-
   4  * Copyright (C) 1995-1997 Gary Thomas (gdt@linuxppc.org)
   5  * All rights reserved.
   6  *
   7  * PCI/ISA I/O support
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. All advertising materials mentioning features or use of this software
  18  *    must display the following acknowledgement:
  19  *      This product includes software developed by Gary Thomas.
  20  * 4. The name of the author may not be used to endorse or promote products
  21  *    derived from this software without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  24  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  25  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  26  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  27  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  28  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  29  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  30  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  31  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  32  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  33  */
  34
  35 #include <lib/libsa/stand.h>
  36 #include <sys/bswap.h>
  37 #include "boot.h"
  38
  39 #define PCI_NSLOTS      8
  40 #define PCI_NREGS       5
  41 #define PCI_DEVID       0
  42 #define PCI_CMD         1
  43 #define PCI_CLASS       2
  44 #define PCI_MEMBASE     4
  45
  46
  47 volatile u_char *ISA_io  = (u_char *)0x80000000;
  48 volatile u_char *ISA_mem = (u_char *)0xc0000000;
  49 volatile char *videomem = (char *)0xc00b8000; /* + vram offset */
  50
  51 struct PCI_cinfo {
  52         u_long *config_addr;
  53         u_long regs[PCI_NREGS];
  54 } PCI_slots[PCI_NSLOTS] = {
  55         { (u_long *)0x80808000, {0xDEADBEEF,} },
  56         { (u_long *)0x80800800, {0xDEADBEEF,} },
  57         { (u_long *)0x80801000, {0xDEADBEEF,} },
  58         { (u_long *)0x80802000, {0xDEADBEEF,} },
  59         { (u_long *)0x80804000, {0xDEADBEEF,} },
  60         { (u_long *)0x80810000, {0xDEADBEEF,} },
  61         { (u_long *)0x80820000, {0xDEADBEEF,} },
  62         { (u_long *)0x80840000, {0xDEADBEEF,} },
  63 };
  64
  65 void
  66 outb(int port, char val)
  67 {
  68
  69         ISA_io[port] = val;
  70 }
  71
  72 inline void
  73 outw(int port, u_int16_t val)
  74 {
  75         outb(port, val>>8);
  76         outb(port+1, val);
  77 }
  78
  79 u_char
  80 inb(int port)
  81 {
  82
  83         return (ISA_io[port]);
  84 }
  85
  86 u_long
  87 local_to_PCI(u_long addr)
  88 {
  89
  90         return ((addr & 0x7FFFFFFF) | 0x80000000);
  91 }
  92
  93 void
  94 unlockVideo(int slot)
  95 {
  96         volatile u_int8_t *ppci;
  97
  98         ppci = (u_int8_t *)PCI_slots[slot].config_addr;
  99         ppci[4] = 0x0003;       /* enable memory and IO Access */
 100 #if 0
 101         ppci[0x10] = 0x00000;   /* Turn off memory mapping */
 102         ppci[0x11] = 0x00000;   /* mem base = 0 */
 103         ppci[0x12] = 0x00000;
 104         ppci[0x13] = 0x00000;
 105 #endif
 106         __asm__ volatile("eieio");
 107
 108         outb(0x3d4, 0x11);
 109         outb(0x3d5, 0x0e);   /* unlock CR0-CR7 */
 110 }
 111
 112 int
 113 scan_PCI(int start)
 114 {
 115         int slot, r;
 116         struct PCI_cinfo *pslot;
 117         int VGAslot = -1;
 118         int highVGAslot = 0;
 119
 120         for (slot = start + 1; slot < PCI_NSLOTS; slot++) {
 121                 pslot = &PCI_slots[slot];
 122                 for (r = 0; r < PCI_NREGS; r++)
 123                         pslot->regs[r] = bswap32(pslot->config_addr[r]);
 124                 if (pslot->regs[PCI_DEVID] != 0xffffffff) {
 125                         /* we have a card */
 126                         if (((pslot->regs[PCI_CLASS] & 0xffffff00) ==
 127                                 0x03000000) ||
 128                             ((pslot->regs[PCI_CLASS] & 0xffffff00) ==
 129                                 0x00010000)) {
 130                                 /* it's a VGA card */
 131                                 highVGAslot = slot;
 132                                 if ((pslot->regs[PCI_CMD] & 0x03)) {
 133                                         /* fW enabled it */
 134                                         VGAslot = slot;
 135                                         break;
 136                                 }
 137                         }
 138                 }
 139         }
 140         return VGAslot;
 141 }
 142
 143 int
 144 PCI_vendor(int slotnum)
 145 {
 146         struct PCI_cinfo *pslot = &PCI_slots[slotnum];
 147
 148         return (pslot->regs[PCI_DEVID] & 0xffff);
 149 }