cia_pci.c revision 1.30
1 /* $NetBSD: cia_pci.c,v 1.30 2010/12/15 01:27:18 matt 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 1.30 2010/12/15 01:27:18 matt 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 <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(struct device *, struct device *, 45 struct pcibus_attach_args *); 46 int cia_bus_maxdevs(void *, int); 47 pcitag_t cia_make_tag(void *, int, int, int); 48 void cia_decompose_tag(void *, pcitag_t, int *, int *, 49 int *); 50 pcireg_t cia_conf_read(void *, pcitag_t, int); 51 void cia_conf_write(void *, pcitag_t, int, pcireg_t); 52 53 void 54 cia_pci_init(pci_chipset_tag_t pc, void *v) 55 { 56 57 pc->pc_conf_v = v; 58 pc->pc_attach_hook = cia_attach_hook; 59 pc->pc_bus_maxdevs = cia_bus_maxdevs; 60 pc->pc_make_tag = cia_make_tag; 61 pc->pc_decompose_tag = cia_decompose_tag; 62 pc->pc_conf_read = cia_conf_read; 63 pc->pc_conf_write = cia_conf_write; 64 } 65 66 void 67 cia_attach_hook(struct device *parent, struct device *self, struct pcibus_attach_args *pba) 68 { 69 } 70 71 int 72 cia_bus_maxdevs(void *cpv, int busno) 73 { 74 75 return 32; 76 } 77 78 pcitag_t 79 cia_make_tag(void *cpv, int b, int d, int f) 80 { 81 82 return (b << 16) | (d << 11) | (f << 8); 83 } 84 85 void 86 cia_decompose_tag(void *cpv, pcitag_t tag, int *bp, int *dp, int *fp) 87 { 88 89 if (bp != NULL) 90 *bp = (tag >> 16) & 0xff; 91 if (dp != NULL) 92 *dp = (tag >> 11) & 0x1f; 93 if (fp != NULL) 94 *fp = (tag >> 8) & 0x7; 95 } 96 97 pcireg_t 98 cia_conf_read(void *cpv, pcitag_t tag, int offset) 99 { 100 struct cia_config *ccp = cpv; 101 pcireg_t *datap, data; 102 int s, secondary, ba; 103 u_int32_t old_cfg, errbits; 104 105 #ifdef __GNUC__ 106 s = 0; /* XXX gcc -Wuninitialized */ 107 old_cfg = 0; /* XXX gcc -Wuninitialized */ 108 #endif 109 110 /* 111 * Some (apparently-common) revisions of EB164 and AlphaStation 112 * firmware do the Wrong thing with PCI master and target aborts, 113 * which are caused by accesing the configuration space of devices 114 * that don't exist (for example). 115 * 116 * To work around this, we clear the CIA error register's PCI 117 * master and target abort bits before touching PCI configuration 118 * space and check it afterwards. If it indicates a master or target 119 * abort, the device wasn't there so we return 0xffffffff. 120 */ 121 REGVAL(CIA_CSR_CIA_ERR) = CIA_ERR_RCVD_MAS_ABT|CIA_ERR_RCVD_TAR_ABT; 122 alpha_mb(); 123 alpha_pal_draina(); 124 125 /* secondary if bus # != 0 */ 126 pci_decompose_tag(&ccp->cc_pc, tag, &secondary, 0, 0); 127 if (secondary) { 128 s = splhigh(); 129 old_cfg = REGVAL(CIA_CSR_CFG); 130 alpha_mb(); 131 REGVAL(CIA_CSR_CFG) = old_cfg | 0x1; 132 alpha_mb(); 133 } 134 135 /* 136 * We just inline the BWX support, since this is the only 137 * difference between BWX and swiz for config space. 138 */ 139 if (ccp->cc_flags & CCF_PCI_USE_BWX) { 140 if (secondary) { 141 datap = 142 (pcireg_t *)ALPHA_PHYS_TO_K0SEG(CIA_EV56_BWCONF1 | 143 tag | (offset & ~0x03)); 144 } else { 145 datap = 146 (pcireg_t *)ALPHA_PHYS_TO_K0SEG(CIA_EV56_BWCONF0 | 147 tag | (offset & ~0x03)); 148 } 149 } else { 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 } 156 data = (pcireg_t)-1; 157 alpha_mb(); 158 if (!(ba = badaddr(datap, sizeof *datap))) 159 data = *datap; 160 alpha_mb(); 161 alpha_mb(); 162 163 if (secondary) { 164 alpha_mb(); 165 REGVAL(CIA_CSR_CFG) = old_cfg; 166 alpha_mb(); 167 splx(s); 168 } 169 170 alpha_pal_draina(); 171 alpha_mb(); 172 errbits = REGVAL(CIA_CSR_CIA_ERR); 173 if (errbits & (CIA_ERR_RCVD_MAS_ABT|CIA_ERR_RCVD_TAR_ABT)) { 174 ba = 1; 175 data = 0xffffffff; 176 } 177 178 if (errbits) { 179 REGVAL(CIA_CSR_CIA_ERR) = errbits; 180 alpha_mb(); 181 alpha_pal_draina(); 182 } 183 184 #if 0 185 printf("cia_conf_read: tag 0x%lx, reg 0x%lx -> %x @ %p%s\n", tag, reg, 186 data, datap, ba ? " (badaddr)" : ""); 187 #endif 188 189 return data; 190 } 191 192 void 193 cia_conf_write(void *cpv, pcitag_t tag, int offset, 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 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 /* 216 * We just inline the BWX support, since this is the only 217 * difference between BWX and swiz for config space. 218 */ 219 if (ccp->cc_flags & CCF_PCI_USE_BWX) { 220 if (secondary) { 221 datap = 222 (pcireg_t *)ALPHA_PHYS_TO_K0SEG(CIA_EV56_BWCONF1 | 223 tag | (offset & ~0x03)); 224 } else { 225 datap = 226 (pcireg_t *)ALPHA_PHYS_TO_K0SEG(CIA_EV56_BWCONF0 | 227 tag | (offset & ~0x03)); 228 } 229 } else { 230 datap = (pcireg_t *)ALPHA_PHYS_TO_K0SEG(CIA_PCI_CONF | 231 tag << 5UL | /* XXX */ 232 (offset & ~0x03) << 5 | /* XXX */ 233 0 << 5 | /* XXX */ 234 0x3 << 3); /* XXX */ 235 } 236 alpha_mb(); 237 *datap = data; 238 alpha_mb(); 239 alpha_mb(); 240 241 if (secondary) { 242 alpha_mb(); 243 REGVAL(CIA_CSR_CFG) = old_cfg; 244 alpha_mb(); 245 splx(s); 246 } 247 248 #if 0 249 printf("cia_conf_write: tag 0x%lx, reg 0x%lx -> 0x%x @ %p\n", tag, 250 reg, data, datap); 251 #endif 252 } 253
Indexes created Mon Oct 27 08:10:08 GMT 2025