cia_pci.c revision 1.21
1/* $NetBSD: cia_pci.c,v 1.21 1998/05/12 18:45:04 thorpej Exp $ */ 2 3/* 4 * Copyright (c) 1995, 1996 Carnegie-Mellon University. 5 * All rights reserved. 6 * 7 * Author: Chris G. Demetriou 8 * 9 * Permission to use, copy, modify and distribute this software and 10 * its documentation is hereby granted, provided that both the copyright 11 * notice and this permission notice appear in all copies of the 12 * software, derivative works or modified versions, and any portions 13 * thereof, and that both notices appear in supporting documentation. 14 * 15 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 16 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND 17 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 18 * 19 * Carnegie Mellon requests users of this software to return to 20 * 21 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 22 * School of Computer Science 23 * Carnegie Mellon University 24 * Pittsburgh PA 15213-3890 25 * 26 * any improvements or extensions that they make and grant Carnegie the 27 * rights to redistribute these changes. 28 */ 29 30#include <sys/cdefs.h> /* RCS ID & Copyright macro defns */ 31 32__KERNEL_RCSID(0, "$NetBSD: cia_pci.c,v 1.21 1998/05/12 18:45:04 thorpej Exp $"); 33 34#include <sys/param.h> 35#include <sys/systm.h> 36#include <sys/kernel.h> 37#include <sys/device.h> 38#include <vm/vm.h> 39 40#include <dev/pci/pcireg.h> 41#include <dev/pci/pcivar.h> 42#include <alpha/pci/ciareg.h> 43#include <alpha/pci/ciavar.h> 44 45void cia_attach_hook __P((struct device *, struct device *, 46 struct pcibus_attach_args *)); 47int cia_bus_maxdevs __P((void *, int)); 48pcitag_t cia_make_tag __P((void *, int, int, int)); 49void cia_decompose_tag __P((void *, pcitag_t, int *, int *, 50 int *)); 51pcireg_t cia_conf_read __P((void *, pcitag_t, int)); 52void cia_conf_write __P((void *, pcitag_t, int, pcireg_t)); 53 54void 55cia_pci_init(pc, v) 56 pci_chipset_tag_t pc; 57 void *v; 58{ 59 60 pc->pc_conf_v = v; 61 pc->pc_attach_hook = cia_attach_hook; 62 pc->pc_bus_maxdevs = cia_bus_maxdevs; 63 pc->pc_make_tag = cia_make_tag; 64 pc->pc_decompose_tag = cia_decompose_tag; 65 pc->pc_conf_read = cia_conf_read; 66 pc->pc_conf_write = cia_conf_write; 67} 68 69void 70cia_attach_hook(parent, self, pba) 71 struct device *parent, *self; 72 struct pcibus_attach_args *pba; 73{ 74} 75 76int 77cia_bus_maxdevs(cpv, busno) 78 void *cpv; 79 int busno; 80{ 81 82 return 32; 83} 84 85pcitag_t 86cia_make_tag(cpv, b, d, f) 87 void *cpv; 88 int b, d, f; 89{ 90 91 return (b << 16) | (d << 11) | (f << 8); 92} 93 94void 95cia_decompose_tag(cpv, tag, bp, dp, fp) 96 void *cpv; 97 pcitag_t tag; 98 int *bp, *dp, *fp; 99{ 100 101 if (bp != NULL) 102 *bp = (tag >> 16) & 0xff; 103 if (dp != NULL) 104 *dp = (tag >> 11) & 0x1f; 105 if (fp != NULL) 106 *fp = (tag >> 8) & 0x7; 107} 108 109pcireg_t 110cia_conf_read(cpv, tag, offset) 111 void *cpv; 112 pcitag_t tag; 113 int offset; 114{ 115 struct cia_config *ccp = cpv; 116 pcireg_t *datap, data; 117 int s, secondary, ba; 118 u_int32_t old_cfg, errbits; 119 120#ifdef __GNUC__ 121 s = 0; /* XXX gcc -Wuninitialized */ 122 old_cfg = 0; /* XXX gcc -Wuninitialized */ 123#endif 124 125 /* 126 * Some (apparently-common) revisions of EB164 and AlphaStation 127 * firmware do the Wrong thing with PCI master and target aborts, 128 * which are caused by accesing the configuration space of devices 129 * that don't exist (for example). 130 * 131 * To work around this, we clear the CIA error register's PCI 132 * master and target abort bits before touching PCI configuration 133 * space and check it afterwards. If it indicates a master or target 134 * abort, the device wasn't there so we return 0xffffffff. 135 */ 136 REGVAL(CIA_CSR_CIA_ERR) = CIA_ERR_RCVD_MAS_ABT|CIA_ERR_RCVD_TAR_ABT; 137 alpha_mb(); 138 alpha_pal_draina(); 139 140 /* secondary if bus # != 0 */ 141 alpha_pci_decompose_tag(&ccp->cc_pc, tag, &secondary, 0, 0); 142 if (secondary) { 143 s = splhigh(); 144 old_cfg = REGVAL(CIA_CSR_CFG); 145 alpha_mb(); 146 REGVAL(CIA_CSR_CFG) = old_cfg | 0x1; 147 alpha_mb(); 148 } 149 150 datap = (pcireg_t *)ALPHA_PHYS_TO_K0SEG(CIA_PCI_CONF | 151 tag << 5UL | /* XXX */ 152 (offset & ~0x03) << 5 | /* XXX */ 153 0 << 5 | /* XXX */ 154 0x3 << 3); /* XXX */ 155 data = (pcireg_t)-1; 156 if (!(ba = badaddr(datap, sizeof *datap))) 157 data = *datap; 158 159 if (secondary) { 160 alpha_mb(); 161 REGVAL(CIA_CSR_CFG) = old_cfg; 162 alpha_mb(); 163 splx(s); 164 } 165 166 alpha_pal_draina(); 167 alpha_mb(); 168 errbits = REGVAL(CIA_CSR_CIA_ERR); 169 if (errbits & (CIA_ERR_RCVD_MAS_ABT|CIA_ERR_RCVD_TAR_ABT)) { 170 ba = 1; 171 data = 0xffffffff; 172 } 173 174 if (errbits) { 175 REGVAL(CIA_CSR_CIA_ERR) = errbits; 176 alpha_mb(); 177 alpha_pal_draina(); 178 } 179 180#if 0 181 printf("cia_conf_read: tag 0x%lx, reg 0x%lx -> %x @ %p%s\n", tag, reg, 182 data, datap, ba ? " (badaddr)" : ""); 183#endif 184 185 return data; 186} 187 188void 189cia_conf_write(cpv, tag, offset, data) 190 void *cpv; 191 pcitag_t tag; 192 int offset; 193 pcireg_t data; 194{ 195 struct cia_config *ccp = cpv; 196 pcireg_t *datap; 197 int s, secondary; 198 u_int32_t old_cfg; 199 200#ifdef __GNUC__ 201 s = 0; /* XXX gcc -Wuninitialized */ 202 old_cfg = 0; /* XXX gcc -Wuninitialized */ 203#endif 204 205 /* secondary if bus # != 0 */ 206 alpha_pci_decompose_tag(&ccp->cc_pc, tag, &secondary, 0, 0); 207 if (secondary) { 208 s = splhigh(); 209 old_cfg = REGVAL(CIA_CSR_CFG); 210 alpha_mb(); 211 REGVAL(CIA_CSR_CFG) = old_cfg | 0x1; 212 alpha_mb(); 213 } 214 215 datap = (pcireg_t *)ALPHA_PHYS_TO_K0SEG(CIA_PCI_CONF | 216 tag << 5UL | /* XXX */ 217 (offset & ~0x03) << 5 | /* XXX */ 218 0 << 5 | /* XXX */ 219 0x3 << 3); /* XXX */ 220 *datap = data; 221 222 if (secondary) { 223 alpha_mb(); 224 REGVAL(CIA_CSR_CFG) = old_cfg; 225 alpha_mb(); 226 splx(s); 227 } 228 229#if 0 230 printf("cia_conf_write: tag 0x%lx, reg 0x%lx -> 0x%x @ %p\n", tag, 231 reg, data, datap); 232#endif 233} 234