cia_pci.c revision 1.7
1 /* $NetBSD: cia_pci.c,v 1.7 1996/11/23 06:46:50 cgd 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/param.h> 31 #include <sys/systm.h> 32 #include <sys/kernel.h> 33 #include <sys/device.h> 34 #include <vm/vm.h> 35 36 #include <dev/pci/pcireg.h> 37 #include <dev/pci/pcivar.h> 38 #include <alpha/pci/ciareg.h> 39 #include <alpha/pci/ciavar.h> 40 41 #include <machine/rpb.h> /* XXX for eb164 CIA firmware workarounds. */ 42 #include "dec_eb164.h" /* XXX for eb164 CIA firmware workarounds. */ 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 int32_t old_haxr2; /* XXX */ 118 #if NDEC_EB164 119 extern int cputype; /* XXX */ 120 #endif 121 122 #ifdef DIAGNOSTIC 123 s = 0; /* XXX gcc -Wuninitialized */ 124 old_haxr2 = 0; /* XXX gcc -Wuninitialized */ 125 #endif 126 127 #if NDEC_EB164 128 /* 129 * Some (apparently-common) revisions of EB164 firmware do the 130 * Wrong thing with PCI master aborts, which are caused by 131 * accesing the configuration space of devices that don't 132 * exist (for example). 133 * 134 * On EB164's we clear the CIA error register's PCI master 135 * abort bit before touching PCI configuration space and 136 * check it afterwards. If it indicates a master abort, 137 * the device wasn't there so we return 0xffffffff. 138 */ 139 if (cputype == ST_EB164) { 140 /* clear the PCI master abort bit in CIA error register */ 141 REGVAL(CIA_CSR_CIA_ERR) = 0x00000080; /* XXX */ 142 alpha_mb(); 143 alpha_pal_draina(); 144 } 145 #endif 146 147 /* secondary if bus # != 0 */ 148 pci_decompose_tag(&ccp->cc_pc, tag, &secondary, 0, 0); 149 if (secondary) { 150 s = splhigh(); 151 old_haxr2 = REGVAL(CIA_CSRS + 0x480); /* XXX */ 152 alpha_mb(); 153 REGVAL(CIA_CSRS + 0x480) = old_haxr2 | 0x1; /* XXX */ 154 alpha_mb(); 155 } 156 157 datap = (pcireg_t *)ALPHA_PHYS_TO_K0SEG(CIA_PCI_CONF | 158 tag << 5UL | /* XXX */ 159 (offset & ~0x03) << 5 | /* XXX */ 160 0 << 5 | /* XXX */ 161 0x3 << 3); /* XXX */ 162 data = (pcireg_t)-1; 163 if (!(ba = badaddr(datap, sizeof *datap))) 164 data = *datap; 165 166 if (secondary) { 167 alpha_mb(); 168 REGVAL(CIA_CSRS + 0x480) = old_haxr2; /* XXX */ 169 alpha_mb(); 170 splx(s); 171 } 172 173 #if NDEC_EB164 174 if (cputype == ST_EB164) { 175 alpha_pal_draina(); 176 /* check CIA error register for PCI master abort */ 177 if (REGVAL(CIA_CSR_CIA_ERR) & 0x00000080) { /* XXX */ 178 ba = 1; 179 data = 0xffffffff; 180 } 181 } 182 #endif 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(cpv, tag, offset, data) 194 void *cpv; 195 pcitag_t tag; 196 int offset; 197 pcireg_t data; 198 { 199 struct cia_config *ccp = cpv; 200 pcireg_t *datap; 201 int s, secondary; 202 int32_t old_haxr2; /* XXX */ 203 204 #ifdef DIAGNOSTIC 205 s = 0; /* XXX gcc -Wuninitialized */ 206 old_haxr2 = 0; /* XXX gcc -Wuninitialized */ 207 #endif 208 209 /* secondary if bus # != 0 */ 210 pci_decompose_tag(&ccp->cc_pc, tag, &secondary, 0, 0); 211 if (secondary) { 212 s = splhigh(); 213 old_haxr2 = REGVAL(CIA_CSRS + 0x480); /* XXX */ 214 alpha_mb(); 215 REGVAL(CIA_CSRS + 0x480) = old_haxr2 | 0x1; /* XXX */ 216 alpha_mb(); 217 } 218 219 datap = (pcireg_t *)ALPHA_PHYS_TO_K0SEG(CIA_PCI_CONF | 220 tag << 5UL | /* XXX */ 221 (offset & ~0x03) << 5 | /* XXX */ 222 0 << 5 | /* XXX */ 223 0x3 << 3); /* XXX */ 224 *datap = data; 225 226 if (secondary) { 227 alpha_mb(); 228 REGVAL(CIA_CSRS + 0x480) = old_haxr2; /* XXX */ 229 alpha_mb(); 230 splx(s); 231 } 232 233 #if 0 234 printf("cia_conf_write: tag 0x%lx, reg 0x%lx -> 0x%x @ %p\n", tag, 235 reg, data, datap); 236 #endif 237 } 238
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