cia_pci.c revision 1.12
1/* $OpenBSD: cia_pci.c,v 1.12 2010/12/04 17:06:31 miod Exp $ */ 2/* $NetBSD: cia_pci.c,v 1.25 2000/06/29 08:58:46 mrg Exp $ */ 3 4/* 5 * Copyright (c) 1995, 1996 Carnegie-Mellon University. 6 * All rights reserved. 7 * 8 * Author: Chris G. Demetriou 9 * 10 * Permission to use, copy, modify and distribute this software and 11 * its documentation is hereby granted, provided that both the copyright 12 * notice and this permission notice appear in all copies of the 13 * software, derivative works or modified versions, and any portions 14 * thereof, and that both notices appear in supporting documentation. 15 * 16 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 17 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND 18 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 19 * 20 * Carnegie Mellon requests users of this software to return to 21 * 22 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 23 * School of Computer Science 24 * Carnegie Mellon University 25 * Pittsburgh PA 15213-3890 26 * 27 * any improvements or extensions that they make and grant Carnegie the 28 * rights to redistribute these changes. 29 */ 30 31#include <sys/param.h> 32#include <sys/systm.h> 33#include <sys/kernel.h> 34#include <sys/device.h> 35 36#include <uvm/uvm_extern.h> 37 38#include <dev/pci/pcireg.h> 39#include <dev/pci/pcivar.h> 40#include <alpha/pci/ciareg.h> 41#include <alpha/pci/ciavar.h> 42 43void cia_attach_hook(struct device *, struct device *, 44 struct pcibus_attach_args *); 45int cia_bus_maxdevs(void *, int); 46pcitag_t cia_make_tag(void *, int, int, int); 47void cia_decompose_tag(void *, pcitag_t, int *, int *, 48 int *); 49int cia_conf_size(void *, pcitag_t); 50pcireg_t cia_conf_read(void *, pcitag_t, int); 51void cia_conf_write(void *, pcitag_t, int, pcireg_t); 52 53void 54cia_pci_init(pc, v) 55 pci_chipset_tag_t pc; 56 void *v; 57{ 58 59 pc->pc_conf_v = v; 60 pc->pc_attach_hook = cia_attach_hook; 61 pc->pc_bus_maxdevs = cia_bus_maxdevs; 62 pc->pc_make_tag = cia_make_tag; 63 pc->pc_decompose_tag = cia_decompose_tag; 64 pc->pc_conf_size = cia_conf_size; 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 109int 110cia_conf_size(void *cpv, pcitag_t tag) 111{ 112 return PCI_CONFIG_SPACE_SIZE; 113} 114 115pcireg_t 116cia_conf_read(cpv, tag, offset) 117 void *cpv; 118 pcitag_t tag; 119 int offset; 120{ 121 struct cia_config *ccp = cpv; 122 pcireg_t *datap, data; 123 int s, secondary, ba; 124 u_int32_t old_cfg, errbits; 125 126#ifdef __GNUC__ 127 s = 0; /* XXX gcc -Wuninitialized */ 128 old_cfg = 0; /* XXX gcc -Wuninitialized */ 129#endif 130 131 /* 132 * Some (apparently common) revisions of EB164 and AlphaStation 133 * firmware do the Wrong thing with PCI master and target aborts, 134 * which are caused by accessing the configuration space of devices 135 * that don't exist (for example). 136 * 137 * To work around this, we clear the CIA error register's PCI 138 * master and target abort bits before touching PCI configuration 139 * space and check it afterwards. If it indicates a master or target 140 * abort, the device wasn't there so we return 0xffffffff. 141 */ 142 REGVAL(CIA_CSR_CIA_ERR) = CIA_ERR_RCVD_MAS_ABT|CIA_ERR_RCVD_TAR_ABT; 143 alpha_mb(); 144 alpha_pal_draina(); 145 146 /* secondary if bus # != 0 */ 147 pci_decompose_tag(&ccp->cc_pc, tag, &secondary, 0, 0); 148 if (secondary) { 149 s = splhigh(); 150 old_cfg = REGVAL(CIA_CSR_CFG); 151 alpha_mb(); 152 REGVAL(CIA_CSR_CFG) = old_cfg | 0x1; 153 alpha_mb(); 154 } 155 156 /* 157 * We just inline the BWX support, since this is the only 158 * difference between BWX and swiz for config space. 159 */ 160 if (ccp->cc_flags & CCF_PCI_USE_BWX) { 161 if (secondary) { 162 datap = 163 (pcireg_t *)ALPHA_PHYS_TO_K0SEG(CIA_EV56_BWCONF1 | 164 tag | (offset & ~0x03)); 165 } else { 166 datap = 167 (pcireg_t *)ALPHA_PHYS_TO_K0SEG(CIA_EV56_BWCONF0 | 168 tag | (offset & ~0x03)); 169 } 170 } else { 171 datap = (pcireg_t *)ALPHA_PHYS_TO_K0SEG(CIA_PCI_CONF | 172 tag << 5UL | /* XXX */ 173 (offset & ~0x03) << 5 | /* XXX */ 174 0 << 5 | /* XXX */ 175 0x3 << 3); /* XXX */ 176 } 177 data = (pcireg_t)-1; 178 alpha_mb(); 179 if (!(ba = badaddr(datap, sizeof *datap))) 180 data = *datap; 181 alpha_mb(); 182 alpha_mb(); 183 184 if (secondary) { 185 alpha_mb(); 186 REGVAL(CIA_CSR_CFG) = old_cfg; 187 alpha_mb(); 188 splx(s); 189 } 190 191 alpha_pal_draina(); 192 alpha_mb(); 193 errbits = REGVAL(CIA_CSR_CIA_ERR); 194 if (errbits & (CIA_ERR_RCVD_MAS_ABT|CIA_ERR_RCVD_TAR_ABT)) { 195 ba = 1; 196 data = 0xffffffff; 197 } 198 199 if (errbits) { 200 REGVAL(CIA_CSR_CIA_ERR) = errbits; 201 alpha_mb(); 202 alpha_pal_draina(); 203 } 204 205#if 0 206 printf("cia_conf_read: tag 0x%lx, reg 0x%lx -> %x @ %p%s\n", tag, reg, 207 data, datap, ba ? " (badaddr)" : ""); 208#endif 209 210 return data; 211} 212 213void 214cia_conf_write(cpv, tag, offset, data) 215 void *cpv; 216 pcitag_t tag; 217 int offset; 218 pcireg_t data; 219{ 220 struct cia_config *ccp = cpv; 221 pcireg_t *datap; 222 int s, secondary; 223 u_int32_t old_cfg; 224 225#ifdef __GNUC__ 226 s = 0; /* XXX gcc -Wuninitialized */ 227 old_cfg = 0; /* XXX gcc -Wuninitialized */ 228#endif 229 230 /* secondary if bus # != 0 */ 231 pci_decompose_tag(&ccp->cc_pc, tag, &secondary, 0, 0); 232 if (secondary) { 233 s = splhigh(); 234 old_cfg = REGVAL(CIA_CSR_CFG); 235 alpha_mb(); 236 REGVAL(CIA_CSR_CFG) = old_cfg | 0x1; 237 alpha_mb(); 238 } 239 240 /* 241 * We just inline the BWX support, since this is the only 242 * difference between BWX and swiz for config space. 243 */ 244 if (ccp->cc_flags & CCF_PCI_USE_BWX) { 245 if (secondary) { 246 datap = 247 (pcireg_t *)ALPHA_PHYS_TO_K0SEG(CIA_EV56_BWCONF1 | 248 tag | (offset & ~0x03)); 249 } else { 250 datap = 251 (pcireg_t *)ALPHA_PHYS_TO_K0SEG(CIA_EV56_BWCONF0 | 252 tag | (offset & ~0x03)); 253 } 254 } else { 255 datap = (pcireg_t *)ALPHA_PHYS_TO_K0SEG(CIA_PCI_CONF | 256 tag << 5UL | /* XXX */ 257 (offset & ~0x03) << 5 | /* XXX */ 258 0 << 5 | /* XXX */ 259 0x3 << 3); /* XXX */ 260 } 261 alpha_mb(); 262 *datap = data; 263 alpha_mb(); 264 alpha_mb(); 265 266 if (secondary) { 267 alpha_mb(); 268 REGVAL(CIA_CSR_CFG) = old_cfg; 269 alpha_mb(); 270 splx(s); 271 } 272 273#if 0 274 printf("cia_conf_write: tag 0x%lx, reg 0x%lx -> 0x%x @ %p\n", tag, 275 reg, data, datap); 276#endif 277} 278