1 /* $NetBSD: pci_user.c,v 1.4 2008/12/14 18:46:33 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1998 5 * Matthias Drochner. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 * 27 */ 28 29 #include "sanamespace.h" 30 31 #include <sys/types.h> 32 #include <machine/pio.h> 33 34 #include <pcivar.h> 35 36 extern int mapio(void); 37 38 /* 39 * Replacement for i386/stand/lib/biospci.c. 40 * Very simple functions to access PCI config space from 41 * userland. Works with configuration mode 1 only, can 42 * only access bus number 0. 43 */ 44 45 #define PCI_MODE1_ENABLE 0x80000000UL 46 #define PCI_MODE1_ADDRESS_REG 0x0cf8 47 #define PCI_MODE1_DATA_REG 0x0cfc 48 49 static int 50 maketag(int bus, int dev, int fcn) 51 { 52 53 return PCI_MODE1_ENABLE | 54 (bus << 16) | (dev << 11) | (fcn << 8); 55 } 56 57 int 58 pcicheck(void) 59 { 60 61 return mapio() ? -1 : 0; 62 } 63 64 int 65 pcifinddev(int vid, int did, pcihdl_t *handle) 66 { 67 int i; 68 69 for (i = 0; i < 32; i++) { 70 pcihdl_t h; 71 int id; 72 h = maketag(0, i, 0); 73 pcicfgread(&h, 0, &id); 74 if (id == (vid | (did << 16))) { 75 *handle = h; 76 return 0; 77 } 78 } 79 return -1; 80 } 81 82 int 83 pcicfgread(pcihdl_t *handle, int off, int *val) 84 { 85 int data; 86 87 outl(PCI_MODE1_ADDRESS_REG, *handle | off); 88 data = inl(PCI_MODE1_DATA_REG); 89 outl(PCI_MODE1_ADDRESS_REG, 0); 90 *val = data; 91 return 0; 92 } 93 94 int 95 pcicfgwrite(pcihdl_t *handle, int off, int val) 96 { 97 outl(PCI_MODE1_ADDRESS_REG, *handle | off); 98 outl(PCI_MODE1_DATA_REG, val); 99 outl(PCI_MODE1_ADDRESS_REG, 0); 100 return 0; 101 } 102