1 /* $NetBSD: cia_pci.c,v 1.32 2012/02/06 02:14:14 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@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 1.32 2012/02/06 02:14:14 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(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 #ifdef __GNUC__ 105 s = 0; /* XXX gcc -Wuninitialized */ 106 old_cfg = 0; /* XXX gcc -Wuninitialized */ 107 #endif 108 109 /* 110 * Some (apparently-common) revisions of EB164 and AlphaStation 111 * firmware do the Wrong thing with PCI master and target aborts, 112 * which are caused by accesing the configuration space of devices 113 * that don't exist (for example). 114 * 115 * To work around this, we clear the CIA error register's PCI 116 * master and target abort bits before touching PCI configuration 117 * space and check it afterwards. If it indicates a master or target 118 * abort, the device wasn't there so we return 0xffffffff. 119 */ 120 REGVAL(CIA_CSR_CIA_ERR) = CIA_ERR_RCVD_MAS_ABT|CIA_ERR_RCVD_TAR_ABT; 121 alpha_mb(); 122 alpha_pal_draina(); 123 124 /* secondary if bus # != 0 */ 125 pci_decompose_tag(&ccp->cc_pc, tag, &secondary, 0, 0); 126 if (secondary) { 127 s = splhigh(); 128 old_cfg = REGVAL(CIA_CSR_CFG); 129 alpha_mb(); 130 REGVAL(CIA_CSR_CFG) = old_cfg | 0x1; 131 alpha_mb(); 132 } 133 134 /* 135 * We just inline the BWX support, since this is the only 136 * difference between BWX and swiz for config space. 137 */ 138 if (ccp->cc_flags & CCF_PCI_USE_BWX) { 139 if (secondary) { 140 datap = 141 (pcireg_t *)ALPHA_PHYS_TO_K0SEG(CIA_EV56_BWCONF1 | 142 tag | (offset & ~0x03)); 143 } else { 144 datap = 145 (pcireg_t *)ALPHA_PHYS_TO_K0SEG(CIA_EV56_BWCONF0 | 146 tag | (offset & ~0x03)); 147 } 148 } else { 149 datap = (pcireg_t *)ALPHA_PHYS_TO_K0SEG(CIA_PCI_CONF | 150 tag << 5UL | /* XXX */ 151 (offset & ~0x03) << 5 | /* XXX */ 152 0 << 5 | /* XXX */ 153 0x3 << 3); /* XXX */ 154 } 155 data = (pcireg_t)-1; 156 alpha_mb(); 157 if (!(ba = badaddr(datap, sizeof *datap))) 158 data = *datap; 159 alpha_mb(); 160 alpha_mb(); 161 162 if (secondary) { 163 alpha_mb(); 164 REGVAL(CIA_CSR_CFG) = old_cfg; 165 alpha_mb(); 166 splx(s); 167 } 168 169 alpha_pal_draina(); 170 alpha_mb(); 171 errbits = REGVAL(CIA_CSR_CIA_ERR); 172 if (errbits & (CIA_ERR_RCVD_MAS_ABT|CIA_ERR_RCVD_TAR_ABT)) { 173 ba = 1; 174 data = 0xffffffff; 175 } 176 177 if (errbits) { 178 REGVAL(CIA_CSR_CIA_ERR) = errbits; 179 alpha_mb(); 180 alpha_pal_draina(); 181 } 182 183 #if 0 184 printf("cia_conf_read: tag 0x%lx, reg 0x%lx -> %x @ %p%s\n", tag, reg, 185 data, datap, ba ? " (badaddr)" : ""); 186 #endif 187 188 return data; 189 } 190 191 void 192 cia_conf_write(void *cpv, pcitag_t tag, int offset, pcireg_t data) 193 { 194 struct cia_config *ccp = cpv; 195 pcireg_t *datap; 196 int s, secondary; 197 uint32_t old_cfg; 198 199 #ifdef __GNUC__ 200 s = 0; /* XXX gcc -Wuninitialized */ 201 old_cfg = 0; /* XXX gcc -Wuninitialized */ 202 #endif 203 204 /* secondary if bus # != 0 */ 205 pci_decompose_tag(&ccp->cc_pc, tag, &secondary, 0, 0); 206 if (secondary) { 207 s = splhigh(); 208 old_cfg = REGVAL(CIA_CSR_CFG); 209 alpha_mb(); 210 REGVAL(CIA_CSR_CFG) = old_cfg | 0x1; 211 alpha_mb(); 212 } 213 214 /* 215 * We just inline the BWX support, since this is the only 216 * difference between BWX and swiz for config space. 217 */ 218 if (ccp->cc_flags & CCF_PCI_USE_BWX) { 219 if (secondary) { 220 datap = 221 (pcireg_t *)ALPHA_PHYS_TO_K0SEG(CIA_EV56_BWCONF1 | 222 tag | (offset & ~0x03)); 223 } else { 224 datap = 225 (pcireg_t *)ALPHA_PHYS_TO_K0SEG(CIA_EV56_BWCONF0 | 226 tag | (offset & ~0x03)); 227 } 228 } else { 229 datap = (pcireg_t *)ALPHA_PHYS_TO_K0SEG(CIA_PCI_CONF | 230 tag << 5UL | /* XXX */ 231 (offset & ~0x03) << 5 | /* XXX */ 232 0 << 5 | /* XXX */ 233 0x3 << 3); /* XXX */ 234 } 235 alpha_mb(); 236 *datap = data; 237 alpha_mb(); 238 alpha_mb(); 239 240 if (secondary) { 241 alpha_mb(); 242 REGVAL(CIA_CSR_CFG) = old_cfg; 243 alpha_mb(); 244 splx(s); 245 } 246 247 #if 0 248 printf("cia_conf_write: tag 0x%lx, reg 0x%lx -> 0x%x @ %p\n", tag, 249 reg, data, datap); 250 #endif 251 } 252