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io.c revision 1.1.64.3 
      1 /*	$NetBSD: io.c,v 1.1.64.3 2006/08/11 15:42:41 yamt Exp $	*/
      2 
      3 /*-
      4  * Copyright (C) 1995-1997 Gary Thomas (gdt (at) 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 }
    150