cia_pci.c revision 1.27
1 /* $NetBSD: cia_pci.c,v 1.27 2009/03/14 14:45:53 dsl 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 (at) 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 1.27 2009/03/14 14:45:53 dsl Exp $"); 33 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/kernel.h> 37 #include <sys/device.h> 38 39 #include <uvm/uvm_extern.h> 40 41 #include <dev/pci/pcireg.h> 42 #include <dev/pci/pcivar.h> 43 #include <alpha/pci/ciareg.h> 44 #include <alpha/pci/ciavar.h> 45 46 void cia_attach_hook(struct device *, struct device *, 47 struct pcibus_attach_args *); 48 int cia_bus_maxdevs(void *, int); 49 pcitag_t cia_make_tag(void *, int, int, int); 50 void cia_decompose_tag(void *, pcitag_t, int *, int *, 51 int *); 52 pcireg_t cia_conf_read(void *, pcitag_t, int); 53 void cia_conf_write(void *, pcitag_t, int, pcireg_t); 54 55 void 56 cia_pci_init(pc, v) 57 pci_chipset_tag_t pc; 58 void *v; 59 { 60 61 pc->pc_conf_v = v; 62 pc->pc_attach_hook = cia_attach_hook; 63 pc->pc_bus_maxdevs = cia_bus_maxdevs; 64 pc->pc_make_tag = cia_make_tag; 65 pc->pc_decompose_tag = cia_decompose_tag; 66 pc->pc_conf_read = cia_conf_read; 67 pc->pc_conf_write = cia_conf_write; 68 } 69 70 void 71 cia_attach_hook(parent, self, pba) 72 struct device *parent, *self; 73 struct pcibus_attach_args *pba; 74 { 75 } 76 77 int 78 cia_bus_maxdevs(cpv, busno) 79 void *cpv; 80 int busno; 81 { 82 83 return 32; 84 } 85 86 pcitag_t 87 cia_make_tag(cpv, b, d, f) 88 void *cpv; 89 int b, d, f; 90 { 91 92 return (b << 16) | (d << 11) | (f << 8); 93 } 94 95 void 96 cia_decompose_tag(cpv, tag, bp, dp, fp) 97 void *cpv; 98 pcitag_t tag; 99 int *bp, *dp, *fp; 100 { 101 102 if (bp != NULL) 103 *bp = (tag >> 16) & 0xff; 104 if (dp != NULL) 105 *dp = (tag >> 11) & 0x1f; 106 if (fp != NULL) 107 *fp = (tag >> 8) & 0x7; 108 } 109 110 pcireg_t 111 cia_conf_read(cpv, tag, offset) 112 void *cpv; 113 pcitag_t tag; 114 int offset; 115 { 116 struct cia_config *ccp = cpv; 117 pcireg_t *datap, data; 118 int s, secondary, ba; 119 u_int32_t old_cfg, errbits; 120 121 #ifdef __GNUC__ 122 s = 0; /* XXX gcc -Wuninitialized */ 123 old_cfg = 0; /* XXX gcc -Wuninitialized */ 124 #endif 125 126 /* 127 * Some (apparently-common) revisions of EB164 and AlphaStation 128 * firmware do the Wrong thing with PCI master and target aborts, 129 * which are caused by accesing the configuration space of devices 130 * that don't exist (for example). 131 * 132 * To work around this, we clear the CIA error register's PCI 133 * master and target abort bits before touching PCI configuration 134 * space and check it afterwards. If it indicates a master or target 135 * abort, the device wasn't there so we return 0xffffffff. 136 */ 137 REGVAL(CIA_CSR_CIA_ERR) = CIA_ERR_RCVD_MAS_ABT|CIA_ERR_RCVD_TAR_ABT; 138 alpha_mb(); 139 alpha_pal_draina(); 140 141 /* secondary if bus # != 0 */ 142 pci_decompose_tag(&ccp->cc_pc, tag, &secondary, 0, 0); 143 if (secondary) { 144 s = splhigh(); 145 old_cfg = REGVAL(CIA_CSR_CFG); 146 alpha_mb(); 147 REGVAL(CIA_CSR_CFG) = old_cfg | 0x1; 148 alpha_mb(); 149 } 150 151 /* 152 * We just inline the BWX support, since this is the only 153 * difference between BWX and swiz for config space. 154 */ 155 if (ccp->cc_flags & CCF_PCI_USE_BWX) { 156 if (secondary) { 157 datap = 158 (pcireg_t *)ALPHA_PHYS_TO_K0SEG(CIA_EV56_BWCONF1 | 159 tag | (offset & ~0x03)); 160 } else { 161 datap = 162 (pcireg_t *)ALPHA_PHYS_TO_K0SEG(CIA_EV56_BWCONF0 | 163 tag | (offset & ~0x03)); 164 } 165 } else { 166 datap = (pcireg_t *)ALPHA_PHYS_TO_K0SEG(CIA_PCI_CONF | 167 tag << 5UL | /* XXX */ 168 (offset & ~0x03) << 5 | /* XXX */ 169 0 << 5 | /* XXX */ 170 0x3 << 3); /* XXX */ 171 } 172 data = (pcireg_t)-1; 173 alpha_mb(); 174 if (!(ba = badaddr(datap, sizeof *datap))) 175 data = *datap; 176 alpha_mb(); 177 alpha_mb(); 178 179 if (secondary) { 180 alpha_mb(); 181 REGVAL(CIA_CSR_CFG) = old_cfg; 182 alpha_mb(); 183 splx(s); 184 } 185 186 alpha_pal_draina(); 187 alpha_mb(); 188 errbits = REGVAL(CIA_CSR_CIA_ERR); 189 if (errbits & (CIA_ERR_RCVD_MAS_ABT|CIA_ERR_RCVD_TAR_ABT)) { 190 ba = 1; 191 data = 0xffffffff; 192 } 193 194 if (errbits) { 195 REGVAL(CIA_CSR_CIA_ERR) = errbits; 196 alpha_mb(); 197 alpha_pal_draina(); 198 } 199 200 #if 0 201 printf("cia_conf_read: tag 0x%lx, reg 0x%lx -> %x @ %p%s\n", tag, reg, 202 data, datap, ba ? " (badaddr)" : ""); 203 #endif 204 205 return data; 206 } 207 208 void 209 cia_conf_write(cpv, tag, offset, data) 210 void *cpv; 211 pcitag_t tag; 212 int offset; 213 pcireg_t data; 214 { 215 struct cia_config *ccp = cpv; 216 pcireg_t *datap; 217 int s, secondary; 218 u_int32_t old_cfg; 219 220 #ifdef __GNUC__ 221 s = 0; /* XXX gcc -Wuninitialized */ 222 old_cfg = 0; /* XXX gcc -Wuninitialized */ 223 #endif 224 225 /* secondary if bus # != 0 */ 226 pci_decompose_tag(&ccp->cc_pc, tag, &secondary, 0, 0); 227 if (secondary) { 228 s = splhigh(); 229 old_cfg = REGVAL(CIA_CSR_CFG); 230 alpha_mb(); 231 REGVAL(CIA_CSR_CFG) = old_cfg | 0x1; 232 alpha_mb(); 233 } 234 235 /* 236 * We just inline the BWX support, since this is the only 237 * difference between BWX and swiz for config space. 238 */ 239 if (ccp->cc_flags & CCF_PCI_USE_BWX) { 240 if (secondary) { 241 datap = 242 (pcireg_t *)ALPHA_PHYS_TO_K0SEG(CIA_EV56_BWCONF1 | 243 tag | (offset & ~0x03)); 244 } else { 245 datap = 246 (pcireg_t *)ALPHA_PHYS_TO_K0SEG(CIA_EV56_BWCONF0 | 247 tag | (offset & ~0x03)); 248 } 249 } else { 250 datap = (pcireg_t *)ALPHA_PHYS_TO_K0SEG(CIA_PCI_CONF | 251 tag << 5UL | /* XXX */ 252 (offset & ~0x03) << 5 | /* XXX */ 253 0 << 5 | /* XXX */ 254 0x3 << 3); /* XXX */ 255 } 256 alpha_mb(); 257 *datap = data; 258 alpha_mb(); 259 alpha_mb(); 260 261 if (secondary) { 262 alpha_mb(); 263 REGVAL(CIA_CSR_CFG) = old_cfg; 264 alpha_mb(); 265 splx(s); 266 } 267 268 #if 0 269 printf("cia_conf_write: tag 0x%lx, reg 0x%lx -> 0x%x @ %p\n", tag, 270 reg, data, datap); 271 #endif 272 } 273
Indexes created Sun Sep 28 16:09:52 GMT 2025