cia_pci.c revision 1.33
1 /* $NetBSD: cia_pci.c,v 1.33 2015/10/02 05:22:49 msaitoh 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 1.33 2015/10/02 05:22:49 msaitoh 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(device_t, device_t, 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 *, int *); 49 pcireg_t cia_conf_read(void *, pcitag_t, int); 50 void cia_conf_write(void *, pcitag_t, int, pcireg_t); 51 52 void 53 cia_pci_init(pci_chipset_tag_t pc, void *v) 54 { 55 56 pc->pc_conf_v = v; 57 pc->pc_attach_hook = cia_attach_hook; 58 pc->pc_bus_maxdevs = cia_bus_maxdevs; 59 pc->pc_make_tag = cia_make_tag; 60 pc->pc_decompose_tag = cia_decompose_tag; 61 pc->pc_conf_read = cia_conf_read; 62 pc->pc_conf_write = cia_conf_write; 63 } 64 65 void 66 cia_attach_hook(device_t parent, device_t self, struct pcibus_attach_args *pba) 67 { 68 } 69 70 int 71 cia_bus_maxdevs(void *cpv, int busno) 72 { 73 74 return 32; 75 } 76 77 pcitag_t 78 cia_make_tag(void *cpv, int b, int d, int f) 79 { 80 81 return (b << 16) | (d << 11) | (f << 8); 82 } 83 84 void 85 cia_decompose_tag(void *cpv, pcitag_t tag, int *bp, int *dp, int *fp) 86 { 87 88 if (bp != NULL) 89 *bp = (tag >> 16) & 0xff; 90 if (dp != NULL) 91 *dp = (tag >> 11) & 0x1f; 92 if (fp != NULL) 93 *fp = (tag >> 8) & 0x7; 94 } 95 96 pcireg_t 97 cia_conf_read(void *cpv, pcitag_t tag, int offset) 98 { 99 struct cia_config *ccp = cpv; 100 pcireg_t *datap, data; 101 int s, secondary, ba; 102 uint32_t old_cfg, errbits; 103 104 if ((unsigned int)offset >= PCI_CONF_SIZE) 105 return (pcireg_t) -1; 106 107 #ifdef __GNUC__ 108 s = 0; /* XXX gcc -Wuninitialized */ 109 old_cfg = 0; /* XXX gcc -Wuninitialized */ 110 #endif 111 112 /* 113 * Some (apparently-common) revisions of EB164 and AlphaStation 114 * firmware do the Wrong thing with PCI master and target aborts, 115 * which are caused by accesing the configuration space of devices 116 * that don't exist (for example). 117 * 118 * To work around this, we clear the CIA error register's PCI 119 * master and target abort bits before touching PCI configuration 120 * space and check it afterwards. If it indicates a master or target 121 * abort, the device wasn't there so we return 0xffffffff. 122 */ 123 REGVAL(CIA_CSR_CIA_ERR) = CIA_ERR_RCVD_MAS_ABT|CIA_ERR_RCVD_TAR_ABT; 124 alpha_mb(); 125 alpha_pal_draina(); 126 127 /* secondary if bus # != 0 */ 128 pci_decompose_tag(&ccp->cc_pc, tag, &secondary, 0, 0); 129 if (secondary) { 130 s = splhigh(); 131 old_cfg = REGVAL(CIA_CSR_CFG); 132 alpha_mb(); 133 REGVAL(CIA_CSR_CFG) = old_cfg | 0x1; 134 alpha_mb(); 135 } 136 137 /* 138 * We just inline the BWX support, since this is the only 139 * difference between BWX and swiz for config space. 140 */ 141 if (ccp->cc_flags & CCF_PCI_USE_BWX) { 142 if (secondary) { 143 datap = 144 (pcireg_t *)ALPHA_PHYS_TO_K0SEG(CIA_EV56_BWCONF1 | 145 tag | (offset & ~0x03)); 146 } else { 147 datap = 148 (pcireg_t *)ALPHA_PHYS_TO_K0SEG(CIA_EV56_BWCONF0 | 149 tag | (offset & ~0x03)); 150 } 151 } else { 152 datap = (pcireg_t *)ALPHA_PHYS_TO_K0SEG(CIA_PCI_CONF | 153 tag << 5UL | /* XXX */ 154 (offset & ~0x03) << 5 | /* XXX */ 155 0 << 5 | /* XXX */ 156 0x3 << 3); /* XXX */ 157 } 158 data = (pcireg_t)-1; 159 alpha_mb(); 160 if (!(ba = badaddr(datap, sizeof *datap))) 161 data = *datap; 162 alpha_mb(); 163 alpha_mb(); 164 165 if (secondary) { 166 alpha_mb(); 167 REGVAL(CIA_CSR_CFG) = old_cfg; 168 alpha_mb(); 169 splx(s); 170 } 171 172 alpha_pal_draina(); 173 alpha_mb(); 174 errbits = REGVAL(CIA_CSR_CIA_ERR); 175 if (errbits & (CIA_ERR_RCVD_MAS_ABT|CIA_ERR_RCVD_TAR_ABT)) { 176 ba = 1; 177 data = 0xffffffff; 178 } 179 180 if (errbits) { 181 REGVAL(CIA_CSR_CIA_ERR) = errbits; 182 alpha_mb(); 183 alpha_pal_draina(); 184 } 185 186 #if 0 187 printf("cia_conf_read: tag 0x%lx, reg 0x%lx -> %x @ %p%s\n", tag, reg, 188 data, datap, ba ? " (badaddr)" : ""); 189 #endif 190 191 return data; 192 } 193 194 void 195 cia_conf_write(void *cpv, pcitag_t tag, int offset, pcireg_t data) 196 { 197 struct cia_config *ccp = cpv; 198 pcireg_t *datap; 199 int s, secondary; 200 uint32_t old_cfg; 201 202 if ((unsigned int)offset >= PCI_CONF_SIZE) 203 return; 204 205 #ifdef __GNUC__ 206 s = 0; /* XXX gcc -Wuninitialized */ 207 old_cfg = 0; /* XXX gcc -Wuninitialized */ 208 #endif 209 210 /* secondary if bus # != 0 */ 211 pci_decompose_tag(&ccp->cc_pc, tag, &secondary, 0, 0); 212 if (secondary) { 213 s = splhigh(); 214 old_cfg = REGVAL(CIA_CSR_CFG); 215 alpha_mb(); 216 REGVAL(CIA_CSR_CFG) = old_cfg | 0x1; 217 alpha_mb(); 218 } 219 220 /* 221 * We just inline the BWX support, since this is the only 222 * difference between BWX and swiz for config space. 223 */ 224 if (ccp->cc_flags & CCF_PCI_USE_BWX) { 225 if (secondary) { 226 datap = 227 (pcireg_t *)ALPHA_PHYS_TO_K0SEG(CIA_EV56_BWCONF1 | 228 tag | (offset & ~0x03)); 229 } else { 230 datap = 231 (pcireg_t *)ALPHA_PHYS_TO_K0SEG(CIA_EV56_BWCONF0 | 232 tag | (offset & ~0x03)); 233 } 234 } else { 235 datap = (pcireg_t *)ALPHA_PHYS_TO_K0SEG(CIA_PCI_CONF | 236 tag << 5UL | /* XXX */ 237 (offset & ~0x03) << 5 | /* XXX */ 238 0 << 5 | /* XXX */ 239 0x3 << 3); /* XXX */ 240 } 241 alpha_mb(); 242 *datap = data; 243 alpha_mb(); 244 alpha_mb(); 245 246 if (secondary) { 247 alpha_mb(); 248 REGVAL(CIA_CSR_CFG) = old_cfg; 249 alpha_mb(); 250 splx(s); 251 } 252 253 #if 0 254 printf("cia_conf_write: tag 0x%lx, reg 0x%lx -> 0x%x @ %p\n", tag, 255 reg, data, datap); 256 #endif 257 } 258
Indexes created Tue Sep 30 11:09:46 GMT 2025