1 /* $OpenBSD: cia_pci.c,v 1.7 2000/11/08 20:59:25 ericj 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 <vm/vm.h> 37 #include <uvm/uvm_extern.h> 38 39 #include <dev/pci/pcireg.h> 40 #include <dev/pci/pcivar.h> 41 #include <alpha/pci/ciareg.h> 42 #include <alpha/pci/ciavar.h> 43 44 void cia_attach_hook __P((struct device *, struct device *, 45 struct pcibus_attach_args *)); 46 int cia_bus_maxdevs __P((void *, int)); 47 pcitag_t cia_make_tag __P((void *, int, int, int)); 48 void cia_decompose_tag __P((void *, pcitag_t, int *, int *, 49 int *)); 50 pcireg_t cia_conf_read __P((void *, pcitag_t, int)); 51 void cia_conf_write __P((void *, pcitag_t, int, pcireg_t)); 52 53 void 54 cia_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_read = cia_conf_read; 65 pc->pc_conf_write = cia_conf_write; 66 } 67 68 void 69 cia_attach_hook(parent, self, pba) 70 struct device *parent, *self; 71 struct pcibus_attach_args *pba; 72 { 73 } 74 75 int 76 cia_bus_maxdevs(cpv, busno) 77 void *cpv; 78 int busno; 79 { 80 81 return 32; 82 } 83 84 pcitag_t 85 cia_make_tag(cpv, b, d, f) 86 void *cpv; 87 int b, d, f; 88 { 89 90 return (b << 16) | (d << 11) | (f << 8); 91 } 92 93 void 94 cia_decompose_tag(cpv, tag, bp, dp, fp) 95 void *cpv; 96 pcitag_t tag; 97 int *bp, *dp, *fp; 98 { 99 100 if (bp != NULL) 101 *bp = (tag >> 16) & 0xff; 102 if (dp != NULL) 103 *dp = (tag >> 11) & 0x1f; 104 if (fp != NULL) 105 *fp = (tag >> 8) & 0x7; 106 } 107 108 pcireg_t 109 cia_conf_read(cpv, tag, offset) 110 void *cpv; 111 pcitag_t tag; 112 int offset; 113 { 114 struct cia_config *ccp = cpv; 115 pcireg_t *datap, data; 116 int s, secondary, ba; 117 u_int32_t old_cfg, errbits; 118 119 #ifdef __GNUC__ 120 s = 0; /* XXX gcc -Wuninitialized */ 121 old_cfg = 0; /* XXX gcc -Wuninitialized */ 122 #endif 123 124 /* 125 * Some (apparently-common) revisions of EB164 and AlphaStation 126 * firmware do the Wrong thing with PCI master and target aborts, 127 * which are caused by accesing the configuration space of devices 128 * that don't exist (for example). 129 * 130 * To work around this, we clear the CIA error register's PCI 131 * master and target abort bits before touching PCI configuration 132 * space and check it afterwards. If it indicates a master or target 133 * abort, the device wasn't there so we return 0xffffffff. 134 */ 135 REGVAL(CIA_CSR_CIA_ERR) = CIA_ERR_RCVD_MAS_ABT|CIA_ERR_RCVD_TAR_ABT; 136 alpha_mb(); 137 alpha_pal_draina(); 138 139 /* secondary if bus # != 0 */ 140 alpha_pci_decompose_tag(&ccp->cc_pc, tag, &secondary, 0, 0); 141 if (secondary) { 142 s = splhigh(); 143 old_cfg = REGVAL(CIA_CSR_CFG); 144 alpha_mb(); 145 REGVAL(CIA_CSR_CFG) = old_cfg | 0x1; 146 alpha_mb(); 147 } 148 149 /* 150 * We just inline the BWX support, since this is the only 151 * difference between BWX and swiz for config space. 152 */ 153 if (ccp->cc_flags & CCF_PCI_USE_BWX) { 154 if (secondary) { 155 datap = 156 (pcireg_t *)ALPHA_PHYS_TO_K0SEG(CIA_EV56_BWCONF1 | 157 tag | (offset & ~0x03)); 158 } else { 159 datap = 160 (pcireg_t *)ALPHA_PHYS_TO_K0SEG(CIA_EV56_BWCONF0 | 161 tag | (offset & ~0x03)); 162 } 163 } else { 164 datap = (pcireg_t *)ALPHA_PHYS_TO_K0SEG(CIA_PCI_CONF | 165 tag << 5UL | /* XXX */ 166 (offset & ~0x03) << 5 | /* XXX */ 167 0 << 5 | /* XXX */ 168 0x3 << 3); /* XXX */ 169 } 170 data = (pcireg_t)-1; 171 alpha_mb(); 172 if (!(ba = badaddr(datap, sizeof *datap))) 173 data = *datap; 174 alpha_mb(); 175 alpha_mb(); 176 177 if (secondary) { 178 alpha_mb(); 179 REGVAL(CIA_CSR_CFG) = old_cfg; 180 alpha_mb(); 181 splx(s); 182 } 183 184 alpha_pal_draina(); 185 alpha_mb(); 186 errbits = REGVAL(CIA_CSR_CIA_ERR); 187 if (errbits & (CIA_ERR_RCVD_MAS_ABT|CIA_ERR_RCVD_TAR_ABT)) { 188 ba = 1; 189 data = 0xffffffff; 190 } 191 192 if (errbits) { 193 REGVAL(CIA_CSR_CIA_ERR) = errbits; 194 alpha_mb(); 195 alpha_pal_draina(); 196 } 197 198 #if 0 199 printf("cia_conf_read: tag 0x%lx, reg 0x%lx -> %x @ %p%s\n", tag, reg, 200 data, datap, ba ? " (badaddr)" : ""); 201 #endif 202 203 return data; 204 } 205 206 void 207 cia_conf_write(cpv, tag, offset, data) 208 void *cpv; 209 pcitag_t tag; 210 int offset; 211 pcireg_t data; 212 { 213 struct cia_config *ccp = cpv; 214 pcireg_t *datap; 215 int s, secondary; 216 u_int32_t old_cfg; 217 218 #ifdef __GNUC__ 219 s = 0; /* XXX gcc -Wuninitialized */ 220 old_cfg = 0; /* XXX gcc -Wuninitialized */ 221 #endif 222 223 /* secondary if bus # != 0 */ 224 alpha_pci_decompose_tag(&ccp->cc_pc, tag, &secondary, 0, 0); 225 if (secondary) { 226 s = splhigh(); 227 old_cfg = REGVAL(CIA_CSR_CFG); 228 alpha_mb(); 229 REGVAL(CIA_CSR_CFG) = old_cfg | 0x1; 230 alpha_mb(); 231 } 232 233 /* 234 * We just inline the BWX support, since this is the only 235 * difference between BWX and swiz for config space. 236 */ 237 if (ccp->cc_flags & CCF_PCI_USE_BWX) { 238 if (secondary) { 239 datap = 240 (pcireg_t *)ALPHA_PHYS_TO_K0SEG(CIA_EV56_BWCONF1 | 241 tag | (offset & ~0x03)); 242 } else { 243 datap = 244 (pcireg_t *)ALPHA_PHYS_TO_K0SEG(CIA_EV56_BWCONF0 | 245 tag | (offset & ~0x03)); 246 } 247 } else { 248 datap = (pcireg_t *)ALPHA_PHYS_TO_K0SEG(CIA_PCI_CONF | 249 tag << 5UL | /* XXX */ 250 (offset & ~0x03) << 5 | /* XXX */ 251 0 << 5 | /* XXX */ 252 0x3 << 3); /* XXX */ 253 } 254 alpha_mb(); 255 *datap = data; 256 alpha_mb(); 257 alpha_mb(); 258 259 if (secondary) { 260 alpha_mb(); 261 REGVAL(CIA_CSR_CFG) = old_cfg; 262 alpha_mb(); 263 splx(s); 264 } 265 266 #if 0 267 printf("cia_conf_write: tag 0x%lx, reg 0x%lx -> 0x%x @ %p\n", tag, 268 reg, data, datap); 269 #endif 270 } 271