cia_pci.c revision 1.28
1 /* $NetBSD: cia_pci.c,v 1.28 2009/03/14 15:35:59 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 1.28 2009/03/14 15:35:59 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(pci_chipset_tag_t pc, 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(void *cpv, int busno) 77 { 78 79 return 32; 80 } 81 82 pcitag_t 83 cia_make_tag(cpv, b, d, f) 84 void *cpv; 85 int b, d, f; 86 { 87 88 return (b << 16) | (d << 11) | (f << 8); 89 } 90 91 void 92 cia_decompose_tag(cpv, tag, bp, dp, fp) 93 void *cpv; 94 pcitag_t tag; 95 int *bp, *dp, *fp; 96 { 97 98 if (bp != NULL) 99 *bp = (tag >> 16) & 0xff; 100 if (dp != NULL) 101 *dp = (tag >> 11) & 0x1f; 102 if (fp != NULL) 103 *fp = (tag >> 8) & 0x7; 104 } 105 106 pcireg_t 107 cia_conf_read(void *cpv, pcitag_t tag, int offset) 108 { 109 struct cia_config *ccp = cpv; 110 pcireg_t *datap, data; 111 int s, secondary, ba; 112 u_int32_t old_cfg, errbits; 113 114 #ifdef __GNUC__ 115 s = 0; /* XXX gcc -Wuninitialized */ 116 old_cfg = 0; /* XXX gcc -Wuninitialized */ 117 #endif 118 119 /* 120 * Some (apparently-common) revisions of EB164 and AlphaStation 121 * firmware do the Wrong thing with PCI master and target aborts, 122 * which are caused by accesing the configuration space of devices 123 * that don't exist (for example). 124 * 125 * To work around this, we clear the CIA error register's PCI 126 * master and target abort bits before touching PCI configuration 127 * space and check it afterwards. If it indicates a master or target 128 * abort, the device wasn't there so we return 0xffffffff. 129 */ 130 REGVAL(CIA_CSR_CIA_ERR) = CIA_ERR_RCVD_MAS_ABT|CIA_ERR_RCVD_TAR_ABT; 131 alpha_mb(); 132 alpha_pal_draina(); 133 134 /* secondary if bus # != 0 */ 135 pci_decompose_tag(&ccp->cc_pc, tag, &secondary, 0, 0); 136 if (secondary) { 137 s = splhigh(); 138 old_cfg = REGVAL(CIA_CSR_CFG); 139 alpha_mb(); 140 REGVAL(CIA_CSR_CFG) = old_cfg | 0x1; 141 alpha_mb(); 142 } 143 144 /* 145 * We just inline the BWX support, since this is the only 146 * difference between BWX and swiz for config space. 147 */ 148 if (ccp->cc_flags & CCF_PCI_USE_BWX) { 149 if (secondary) { 150 datap = 151 (pcireg_t *)ALPHA_PHYS_TO_K0SEG(CIA_EV56_BWCONF1 | 152 tag | (offset & ~0x03)); 153 } else { 154 datap = 155 (pcireg_t *)ALPHA_PHYS_TO_K0SEG(CIA_EV56_BWCONF0 | 156 tag | (offset & ~0x03)); 157 } 158 } else { 159 datap = (pcireg_t *)ALPHA_PHYS_TO_K0SEG(CIA_PCI_CONF | 160 tag << 5UL | /* XXX */ 161 (offset & ~0x03) << 5 | /* XXX */ 162 0 << 5 | /* XXX */ 163 0x3 << 3); /* XXX */ 164 } 165 data = (pcireg_t)-1; 166 alpha_mb(); 167 if (!(ba = badaddr(datap, sizeof *datap))) 168 data = *datap; 169 alpha_mb(); 170 alpha_mb(); 171 172 if (secondary) { 173 alpha_mb(); 174 REGVAL(CIA_CSR_CFG) = old_cfg; 175 alpha_mb(); 176 splx(s); 177 } 178 179 alpha_pal_draina(); 180 alpha_mb(); 181 errbits = REGVAL(CIA_CSR_CIA_ERR); 182 if (errbits & (CIA_ERR_RCVD_MAS_ABT|CIA_ERR_RCVD_TAR_ABT)) { 183 ba = 1; 184 data = 0xffffffff; 185 } 186 187 if (errbits) { 188 REGVAL(CIA_CSR_CIA_ERR) = errbits; 189 alpha_mb(); 190 alpha_pal_draina(); 191 } 192 193 #if 0 194 printf("cia_conf_read: tag 0x%lx, reg 0x%lx -> %x @ %p%s\n", tag, reg, 195 data, datap, ba ? " (badaddr)" : ""); 196 #endif 197 198 return data; 199 } 200 201 void 202 cia_conf_write(void *cpv, pcitag_t tag, int offset, pcireg_t data) 203 { 204 struct cia_config *ccp = cpv; 205 pcireg_t *datap; 206 int s, secondary; 207 u_int32_t old_cfg; 208 209 #ifdef __GNUC__ 210 s = 0; /* XXX gcc -Wuninitialized */ 211 old_cfg = 0; /* XXX gcc -Wuninitialized */ 212 #endif 213 214 /* secondary if bus # != 0 */ 215 pci_decompose_tag(&ccp->cc_pc, tag, &secondary, 0, 0); 216 if (secondary) { 217 s = splhigh(); 218 old_cfg = REGVAL(CIA_CSR_CFG); 219 alpha_mb(); 220 REGVAL(CIA_CSR_CFG) = old_cfg | 0x1; 221 alpha_mb(); 222 } 223 224 /* 225 * We just inline the BWX support, since this is the only 226 * difference between BWX and swiz for config space. 227 */ 228 if (ccp->cc_flags & CCF_PCI_USE_BWX) { 229 if (secondary) { 230 datap = 231 (pcireg_t *)ALPHA_PHYS_TO_K0SEG(CIA_EV56_BWCONF1 | 232 tag | (offset & ~0x03)); 233 } else { 234 datap = 235 (pcireg_t *)ALPHA_PHYS_TO_K0SEG(CIA_EV56_BWCONF0 | 236 tag | (offset & ~0x03)); 237 } 238 } else { 239 datap = (pcireg_t *)ALPHA_PHYS_TO_K0SEG(CIA_PCI_CONF | 240 tag << 5UL | /* XXX */ 241 (offset & ~0x03) << 5 | /* XXX */ 242 0 << 5 | /* XXX */ 243 0x3 << 3); /* XXX */ 244 } 245 alpha_mb(); 246 *datap = data; 247 alpha_mb(); 248 alpha_mb(); 249 250 if (secondary) { 251 alpha_mb(); 252 REGVAL(CIA_CSR_CFG) = old_cfg; 253 alpha_mb(); 254 splx(s); 255 } 256 257 #if 0 258 printf("cia_conf_write: tag 0x%lx, reg 0x%lx -> 0x%x @ %p\n", tag, 259 reg, data, datap); 260 #endif 261 } 262
Indexes created Mon Sep 29 21:09:56 GMT 2025