1 /* $NetBSD: apecs_pci.c,v 1.27 2021/05/07 16:58:34 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@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: apecs_pci.c,v 1.27 2021/05/07 16:58:34 thorpej 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/apecsreg.h> 42 #include <alpha/pci/apecsvar.h> 43 44 static void apecs_attach_hook(device_t, device_t, 45 struct pcibus_attach_args *); 46 static int apecs_bus_maxdevs(void *, int); 47 static pcitag_t apecs_make_tag(void *, int, int, int); 48 static void apecs_decompose_tag(void *, pcitag_t, int *, int *, int *); 49 static pcireg_t apecs_conf_read(void *, pcitag_t, int); 50 static void apecs_conf_write(void *, pcitag_t, int, pcireg_t); 51 52 void 53 apecs_pci_init(pci_chipset_tag_t pc, void *v) 54 { 55 56 pc->pc_conf_v = v; 57 pc->pc_attach_hook = apecs_attach_hook; 58 pc->pc_bus_maxdevs = apecs_bus_maxdevs; 59 pc->pc_make_tag = apecs_make_tag; 60 pc->pc_decompose_tag = apecs_decompose_tag; 61 pc->pc_conf_read = apecs_conf_read; 62 pc->pc_conf_write = apecs_conf_write; 63 } 64 65 static void 66 apecs_attach_hook(device_t parent, device_t self, struct pcibus_attach_args *pba) 67 { 68 } 69 70 static int 71 apecs_bus_maxdevs(void *cpv, int busno) 72 { 73 74 return 32; 75 } 76 77 static pcitag_t 78 apecs_make_tag(void *cpv, int b, int d, int f) 79 { 80 81 return (b << 16) | (d << 11) | (f << 8); 82 } 83 84 static void 85 apecs_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 static pcireg_t 97 apecs_conf_read(void *cpv, pcitag_t tag, int offset) 98 { 99 struct apecs_config *acp = cpv; 100 pcireg_t *datap, data; 101 int s, secondary, ba; 102 int32_t old_haxr2; /* XXX */ 103 104 if ((unsigned int)offset >= PCI_CONF_SIZE) 105 return (pcireg_t) -1; 106 107 s = 0; /* XXX gcc -Wuninitialized */ 108 old_haxr2 = 0; /* XXX gcc -Wuninitialized */ 109 110 /* secondary if bus # != 0 */ 111 pci_decompose_tag(&acp->ac_pc, tag, &secondary, 0, 0); 112 if (secondary) { 113 s = splhigh(); 114 old_haxr2 = REGVAL(EPIC_HAXR2); 115 alpha_mb(); 116 REGVAL(EPIC_HAXR2) = old_haxr2 | 0x1; 117 alpha_mb(); 118 } 119 120 datap = (pcireg_t *)ALPHA_PHYS_TO_K0SEG(APECS_PCI_CONF | 121 tag << 5UL | /* XXX */ 122 (offset & ~0x03) << 5 | /* XXX */ 123 0 << 5 | /* XXX */ 124 0x3 << 3); /* XXX */ 125 data = (pcireg_t)-1; 126 if (!(ba = badaddr(datap, sizeof *datap))) 127 data = *datap; 128 129 if (secondary) { 130 alpha_mb(); 131 REGVAL(EPIC_HAXR2) = old_haxr2; 132 alpha_mb(); 133 splx(s); 134 } 135 136 #if 0 137 printf("apecs_conf_read: tag 0x%lx, reg 0x%lx -> %x @ %p%s\n", tag, reg, 138 data, datap, ba ? " (badaddr)" : ""); 139 #endif 140 141 return data; 142 } 143 144 static void 145 apecs_conf_write(void *cpv, pcitag_t tag, int offset, pcireg_t data) 146 { 147 struct apecs_config *acp = cpv; 148 pcireg_t *datap; 149 int s, secondary; 150 int32_t old_haxr2; /* XXX */ 151 152 if ((unsigned int)offset >= PCI_CONF_SIZE) 153 return; 154 155 s = 0; /* XXX gcc -Wuninitialized */ 156 old_haxr2 = 0; /* XXX gcc -Wuninitialized */ 157 158 /* secondary if bus # != 0 */ 159 pci_decompose_tag(&acp->ac_pc, tag, &secondary, 0, 0); 160 if (secondary) { 161 s = splhigh(); 162 old_haxr2 = REGVAL(EPIC_HAXR2); 163 alpha_mb(); 164 REGVAL(EPIC_HAXR2) = old_haxr2 | 0x1; 165 alpha_mb(); 166 } 167 168 datap = (pcireg_t *)ALPHA_PHYS_TO_K0SEG(APECS_PCI_CONF | 169 tag << 5UL | /* XXX */ 170 (offset & ~0x03) << 5 | /* XXX */ 171 0 << 5 | /* XXX */ 172 0x3 << 3); /* XXX */ 173 174 alpha_mb(); 175 *datap = data; 176 alpha_mb(); 177 alpha_mb(); 178 179 if (secondary) { 180 alpha_mb(); 181 REGVAL(EPIC_HAXR2) = old_haxr2; 182 alpha_mb(); 183 splx(s); 184 } 185 186 #if 0 187 printf("apecs_conf_write: tag 0x%lx, reg 0x%lx -> 0x%x @ %p\n", tag, 188 reg, data, datap); 189 #endif 190 } 191