cia_pci.c revision 1.11.2.3
1 /* $NetBSD: cia_pci.c,v 1.11.2.3 1997/09/16 03:48:05 thorpej 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 1.11.2.3 1997/09/16 03:48:05 thorpej Exp $"); 33 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/kernel.h> 37 #include <sys/device.h> 38 #include <vm/vm.h> 39 40 #include <dev/pci/pcireg.h> 41 #include <dev/pci/pcivar.h> 42 #include <alpha/pci/ciareg.h> 43 #include <alpha/pci/ciavar.h> 44 45 #include <machine/rpb.h> /* XXX for eb164 CIA firmware workarounds. */ 46 47 void cia_attach_hook __P((struct device *, struct device *, 48 struct pcibus_attach_args *)); 49 int cia_bus_maxdevs __P((void *, int)); 50 pcitag_t cia_make_tag __P((void *, int, int, int)); 51 void cia_decompose_tag __P((void *, pcitag_t, int *, int *, 52 int *)); 53 pcireg_t cia_conf_read __P((void *, pcitag_t, int)); 54 void cia_conf_write __P((void *, pcitag_t, int, pcireg_t)); 55 56 void 57 cia_pci_init(pc, v) 58 pci_chipset_tag_t pc; 59 void *v; 60 { 61 62 pc->pc_conf_v = v; 63 pc->pc_attach_hook = cia_attach_hook; 64 pc->pc_bus_maxdevs = cia_bus_maxdevs; 65 pc->pc_make_tag = cia_make_tag; 66 pc->pc_decompose_tag = cia_decompose_tag; 67 pc->pc_conf_read = cia_conf_read; 68 pc->pc_conf_write = cia_conf_write; 69 } 70 71 void 72 cia_attach_hook(parent, self, pba) 73 struct device *parent, *self; 74 struct pcibus_attach_args *pba; 75 { 76 } 77 78 int 79 cia_bus_maxdevs(cpv, busno) 80 void *cpv; 81 int busno; 82 { 83 84 return 32; 85 } 86 87 pcitag_t 88 cia_make_tag(cpv, b, d, f) 89 void *cpv; 90 int b, d, f; 91 { 92 93 return (b << 16) | (d << 11) | (f << 8); 94 } 95 96 void 97 cia_decompose_tag(cpv, tag, bp, dp, fp) 98 void *cpv; 99 pcitag_t tag; 100 int *bp, *dp, *fp; 101 { 102 103 if (bp != NULL) 104 *bp = (tag >> 16) & 0xff; 105 if (dp != NULL) 106 *dp = (tag >> 11) & 0x1f; 107 if (fp != NULL) 108 *fp = (tag >> 8) & 0x7; 109 } 110 111 pcireg_t 112 cia_conf_read(cpv, tag, offset) 113 void *cpv; 114 pcitag_t tag; 115 int offset; 116 { 117 struct cia_config *ccp = cpv; 118 pcireg_t *datap, data; 119 int s, secondary, ba; 120 int32_t old_haxr2; /* XXX */ 121 122 #ifdef DIAGNOSTIC 123 s = 0; /* XXX gcc -Wuninitialized */ 124 old_haxr2 = 0; /* XXX gcc -Wuninitialized */ 125 #endif 126 127 /* 128 * Some (apparently-common) revisions of EB164 and AlphaStation 129 * firmware do the Wrong thing with PCI master aborts, which are 130 * caused by accesing the configuration space of devices that 131 * don't exist (for example). 132 * 133 * To work around this, we clear the CIA error register's PCI 134 * master abort bit before touching PCI configuration space and 135 * check it afterwards. If it indicates a master abort, 136 * the device wasn't there so we return 0xffffffff. 137 */ 138 /* clear the PCI master abort bit in CIA error register */ 139 REGVAL(CIA_CSR_CIA_ERR) = 0x00000080; /* XXX */ 140 alpha_mb(); 141 alpha_pal_draina(); 142 143 /* secondary if bus # != 0 */ 144 alpha_pci_decompose_tag(&ccp->cc_pc, tag, &secondary, 0, 0); 145 if (secondary) { 146 s = splhigh(); 147 old_haxr2 = REGVAL(CIA_CSRS + 0x480); /* XXX */ 148 alpha_mb(); 149 REGVAL(CIA_CSRS + 0x480) = old_haxr2 | 0x1; /* XXX */ 150 alpha_mb(); 151 } 152 153 datap = (pcireg_t *)ALPHA_PHYS_TO_K0SEG(CIA_PCI_CONF | 154 tag << 5UL | /* XXX */ 155 (offset & ~0x03) << 5 | /* XXX */ 156 0 << 5 | /* XXX */ 157 0x3 << 3); /* XXX */ 158 data = (pcireg_t)-1; 159 if (!(ba = badaddr(datap, sizeof *datap))) 160 data = *datap; 161 162 if (secondary) { 163 alpha_mb(); 164 REGVAL(CIA_CSRS + 0x480) = old_haxr2; /* XXX */ 165 alpha_mb(); 166 splx(s); 167 } 168 169 alpha_pal_draina(); 170 /* check CIA error register for PCI master abort */ 171 if (REGVAL(CIA_CSR_CIA_ERR) & 0x00000080) { /* XXX */ 172 ba = 1; 173 data = 0xffffffff; 174 } 175 176 #if 0 177 printf("cia_conf_read: tag 0x%lx, reg 0x%lx -> %x @ %p%s\n", tag, reg, 178 data, datap, ba ? " (badaddr)" : ""); 179 #endif 180 181 return data; 182 } 183 184 void 185 cia_conf_write(cpv, tag, offset, data) 186 void *cpv; 187 pcitag_t tag; 188 int offset; 189 pcireg_t data; 190 { 191 struct cia_config *ccp = cpv; 192 pcireg_t *datap; 193 int s, secondary; 194 int32_t old_haxr2; /* XXX */ 195 196 #ifdef DIAGNOSTIC 197 s = 0; /* XXX gcc -Wuninitialized */ 198 old_haxr2 = 0; /* XXX gcc -Wuninitialized */ 199 #endif 200 201 /* secondary if bus # != 0 */ 202 alpha_pci_decompose_tag(&ccp->cc_pc, tag, &secondary, 0, 0); 203 if (secondary) { 204 s = splhigh(); 205 old_haxr2 = REGVAL(CIA_CSRS + 0x480); /* XXX */ 206 alpha_mb(); 207 REGVAL(CIA_CSRS + 0x480) = old_haxr2 | 0x1; /* XXX */ 208 alpha_mb(); 209 } 210 211 datap = (pcireg_t *)ALPHA_PHYS_TO_K0SEG(CIA_PCI_CONF | 212 tag << 5UL | /* XXX */ 213 (offset & ~0x03) << 5 | /* XXX */ 214 0 << 5 | /* XXX */ 215 0x3 << 3); /* XXX */ 216 *datap = data; 217 218 if (secondary) { 219 alpha_mb(); 220 REGVAL(CIA_CSRS + 0x480) = old_haxr2; /* XXX */ 221 alpha_mb(); 222 splx(s); 223 } 224 225 #if 0 226 printf("cia_conf_write: tag 0x%lx, reg 0x%lx -> 0x%x @ %p\n", tag, 227 reg, data, datap); 228 #endif 229 } 230
Indexes created Tue Oct 28 07:09:57 GMT 2025