1 /* $NetBSD: gapspci_pci.c,v 1.19 2025/11/24 13:28:58 thorpej Exp $ */ 2 3 /*- 4 * Copyright (c) 2001 Marcus Comstedt. 5 * Copyright (c) 2001 Jason R. Thorpe. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of The NetBSD Foundation nor the names of its 17 * contributors may be used to endorse or promote products derived 18 * from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 /* 34 * PCI configuration space implementation for the SEGA GAPS PCI bridge. 35 */ 36 37 #include <sys/cdefs.h> /* RCS ID & Copyright macro defns */ 38 __KERNEL_RCSID(0, "$NetBSD: gapspci_pci.c,v 1.19 2025/11/24 13:28:58 thorpej Exp $"); 39 40 #include <sys/param.h> 41 #include <sys/systm.h> 42 #include <sys/kernel.h> 43 #include <sys/device.h> 44 #include <sys/bus.h> 45 46 #include <machine/cpu.h> 47 #include <machine/sysasicvar.h> 48 49 #include <dev/pci/pcivar.h> 50 #include <dev/pci/pcireg.h> 51 52 #include <dreamcast/dev/g2/gapspcivar.h> 53 54 void gaps_attach_hook(device_t, device_t, 55 struct pcibus_attach_args *); 56 int gaps_bus_maxdevs(void *, int); 57 pcitag_t gaps_make_tag(void *, int, int, int); 58 void gaps_decompose_tag(void *, pcitag_t, int *, int *, int *); 59 pcireg_t gaps_conf_read(void *, pcitag_t, int); 60 void gaps_conf_write(void *, pcitag_t, int, pcireg_t); 61 62 int gaps_intr_map(const struct pci_attach_args *, pci_intr_handle_t *); 63 const char *gaps_intr_string(void *, pci_intr_handle_t, 64 char *buf, size_t len); 65 void *gaps_intr_establish(void *, pci_intr_handle_t, 66 int, int (*)(void *), void *); 67 void gaps_intr_disestablish(void *, void *); 68 69 void 70 gaps_pci_init(struct gaps_softc *sc) 71 { 72 pci_chipset_tag_t pc = &sc->sc_pc; 73 74 memset(pc, 0, sizeof(*pc)); 75 76 pc->pc_attach_hook = gaps_attach_hook; 77 pc->pc_bus_maxdevs = gaps_bus_maxdevs; 78 pc->pc_make_tag = gaps_make_tag; 79 pc->pc_decompose_tag = gaps_decompose_tag; 80 pc->pc_conf_read = gaps_conf_read; 81 pc->pc_conf_write = gaps_conf_write; 82 pc->pc_conf_v = sc; 83 84 pc->pc_intr_map = gaps_intr_map; 85 pc->pc_intr_string = gaps_intr_string; 86 pc->pc_intr_establish = gaps_intr_establish; 87 pc->pc_intr_disestablish = gaps_intr_disestablish; 88 89 if (bus_space_map(sc->sc_memt, 0x01001600, 0x100, 90 0, &sc->sc_pci_memh) != 0) 91 panic("gaps_pci_init: can't map PCI configuration space"); 92 } 93 94 #define GAPS_PCITAG_MAGIC 0x022473 95 96 void 97 gaps_attach_hook(device_t parent, device_t pci, struct pcibus_attach_args *pba) 98 { 99 struct gaps_softc *sc = device_private(parent); 100 101 /* 102 * Now that we know there's a bus configured, go ahead and 103 * program the BAR on the device. 104 */ 105 pci_conf_write(&sc->sc_pc, GAPS_PCITAG_MAGIC, 106 PCI_MAPREG_START + 4, 0x01000000); 107 pci_conf_write(&sc->sc_pc, GAPS_PCITAG_MAGIC, PCI_COMMAND_STATUS_REG, 108 pci_conf_read(&sc->sc_pc, 0, PCI_COMMAND_STATUS_REG) | 109 PCI_COMMAND_MEM_ENABLE | PCI_COMMAND_MASTER_ENABLE); 110 } 111 112 int 113 gaps_bus_maxdevs(void *v, int bus) 114 { 115 116 return 1; 117 } 118 119 pcitag_t 120 gaps_make_tag(void *v, int bus, int dev, int func) 121 { 122 123 if (bus == 0 && dev == 0 && func == 0) 124 return GAPS_PCITAG_MAGIC; 125 126 return 0; 127 } 128 129 void 130 gaps_decompose_tag(void *v, pcitag_t tag, int *bp, int *dp, int *fp) 131 { 132 int b, d, f; 133 134 if (tag == GAPS_PCITAG_MAGIC) 135 b = d = f = 0; 136 else { 137 /* 138 * Invalid for GAPS. These values ensure that a valid 139 * tag cannot be built. 140 */ 141 b = 0xff; 142 d = 0x1f; 143 f = 0x7; 144 } 145 146 if (bp != NULL) 147 *bp = b; 148 if (dp != NULL) 149 *dp = d; 150 if (fp != NULL) 151 *fp = f; 152 } 153 154 pcireg_t 155 gaps_conf_read(void *v, pcitag_t tag, int reg) 156 { 157 struct gaps_softc *sc = v; 158 159 if (tag != GAPS_PCITAG_MAGIC) 160 return -1; 161 162 if ((unsigned int)reg >= PCI_CONF_SIZE) 163 return -1; 164 165 if (reg == (PCI_MAPREG_START + 4)) { 166 /* 167 * We fake the BAR -- just return the physical address 168 * to which the device is mapped. 169 */ 170 return 0x01001700; 171 } 172 173 return bus_space_read_4(sc->sc_memt, sc->sc_pci_memh, reg); 174 } 175 176 void 177 gaps_conf_write(void *v, pcitag_t tag, int reg, pcireg_t val) 178 { 179 struct gaps_softc *sc = v; 180 181 if (tag != GAPS_PCITAG_MAGIC) 182 return; 183 184 if ((unsigned int)reg >= PCI_CONF_SIZE) 185 return; 186 187 /* Disallow writing to the "BAR" ... it doesn't actually exist. */ 188 if (reg == (PCI_MAPREG_START + 4) && val != 0x01000000) 189 return; 190 191 bus_space_write_4(sc->sc_memt, sc->sc_pci_memh, reg, val); 192 } 193 194 int 195 gaps_intr_map(const struct pci_attach_args *pa, pci_intr_handle_t *ihp) 196 { 197 198 *ihp = SYSASIC_EVENT_EXT; 199 return 0; 200 } 201 202 const char * 203 gaps_intr_string(void *v, pci_intr_handle_t ih, 204 char *buf, size_t len) 205 { 206 207 strlcpy(buf, sysasic_intr_string(SYSASIC_IRL11), len); 208 return buf; 209 } 210 211 void * 212 gaps_intr_establish(void *v, pci_intr_handle_t ih, int level, 213 int (*func)(void *), void *arg) 214 { 215 216 return sysasic_intr_establish(ih, level, SYSASIC_IRL11, func, arg); 217 } 218 219 void 220 gaps_intr_disestablish(void *v, void *ih) 221 { 222 223 return sysasic_intr_disestablish(ih); 224 } 225
Indexes created Sun Oct 25 00:26:45 UTC 2026