1 /* $NetBSD: gapspci_pci.c,v 1.18 2021/08/07 19:41:13 andvar 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. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by Marcus Comstedt. 19 * 4. Neither the name of The NetBSD Foundation nor the names of its 20 * contributors may be used to endorse or promote products derived 21 * from this software without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 24 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 25 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 26 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 27 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 28 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 29 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 30 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 31 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 32 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 33 * POSSIBILITY OF SUCH DAMAGE. 34 */ 35 36 /* 37 * PCI configuration space implementation for the SEGA GAPS PCI bridge. 38 */ 39 40 #include <sys/cdefs.h> /* RCS ID & Copyright macro defns */ 41 __KERNEL_RCSID(0, "$NetBSD: gapspci_pci.c,v 1.18 2021/08/07 19:41:13 andvar Exp $"); 42 43 #include <sys/param.h> 44 #include <sys/systm.h> 45 #include <sys/kernel.h> 46 #include <sys/device.h> 47 #include <sys/bus.h> 48 49 #include <machine/cpu.h> 50 #include <machine/sysasicvar.h> 51 52 #include <dev/pci/pcivar.h> 53 #include <dev/pci/pcireg.h> 54 55 #include <dreamcast/dev/g2/gapspcivar.h> 56 57 void gaps_attach_hook(device_t, device_t, 58 struct pcibus_attach_args *); 59 int gaps_bus_maxdevs(void *, int); 60 pcitag_t gaps_make_tag(void *, int, int, int); 61 void gaps_decompose_tag(void *, pcitag_t, int *, int *, int *); 62 pcireg_t gaps_conf_read(void *, pcitag_t, int); 63 void gaps_conf_write(void *, pcitag_t, int, pcireg_t); 64 65 int gaps_intr_map(const struct pci_attach_args *, pci_intr_handle_t *); 66 const char *gaps_intr_string(void *, pci_intr_handle_t, 67 char *buf, size_t len); 68 void *gaps_intr_establish(void *, pci_intr_handle_t, 69 int, int (*)(void *), void *); 70 void gaps_intr_disestablish(void *, void *); 71 72 void 73 gaps_pci_init(struct gaps_softc *sc) 74 { 75 pci_chipset_tag_t pc = &sc->sc_pc; 76 77 memset(pc, 0, sizeof(*pc)); 78 79 pc->pc_attach_hook = gaps_attach_hook; 80 pc->pc_bus_maxdevs = gaps_bus_maxdevs; 81 pc->pc_make_tag = gaps_make_tag; 82 pc->pc_decompose_tag = gaps_decompose_tag; 83 pc->pc_conf_read = gaps_conf_read; 84 pc->pc_conf_write = gaps_conf_write; 85 pc->pc_conf_v = sc; 86 87 pc->pc_intr_map = gaps_intr_map; 88 pc->pc_intr_string = gaps_intr_string; 89 pc->pc_intr_establish = gaps_intr_establish; 90 pc->pc_intr_disestablish = gaps_intr_disestablish; 91 92 if (bus_space_map(sc->sc_memt, 0x01001600, 0x100, 93 0, &sc->sc_pci_memh) != 0) 94 panic("gaps_pci_init: can't map PCI configuration space"); 95 } 96 97 #define GAPS_PCITAG_MAGIC 0x022473 98 99 void 100 gaps_attach_hook(device_t parent, device_t pci, struct pcibus_attach_args *pba) 101 { 102 struct gaps_softc *sc = device_private(parent); 103 104 /* 105 * Now that we know there's a bus configured, go ahead and 106 * program the BAR on the device. 107 */ 108 pci_conf_write(&sc->sc_pc, GAPS_PCITAG_MAGIC, 109 PCI_MAPREG_START + 4, 0x01000000); 110 pci_conf_write(&sc->sc_pc, GAPS_PCITAG_MAGIC, PCI_COMMAND_STATUS_REG, 111 pci_conf_read(&sc->sc_pc, 0, PCI_COMMAND_STATUS_REG) | 112 PCI_COMMAND_MEM_ENABLE | PCI_COMMAND_MASTER_ENABLE); 113 } 114 115 int 116 gaps_bus_maxdevs(void *v, int bus) 117 { 118 119 return 1; 120 } 121 122 pcitag_t 123 gaps_make_tag(void *v, int bus, int dev, int func) 124 { 125 126 if (bus == 0 && dev == 0 && func == 0) 127 return GAPS_PCITAG_MAGIC; 128 129 return 0; 130 } 131 132 void 133 gaps_decompose_tag(void *v, pcitag_t tag, int *bp, int *dp, int *fp) 134 { 135 int b, d, f; 136 137 if (tag == GAPS_PCITAG_MAGIC) 138 b = d = f = 0; 139 else { 140 /* 141 * Invalid for GAPS. These values ensure that a valid 142 * tag cannot be built. 143 */ 144 b = 0xff; 145 d = 0x1f; 146 f = 0x7; 147 } 148 149 if (bp != NULL) 150 *bp = b; 151 if (dp != NULL) 152 *dp = d; 153 if (fp != NULL) 154 *fp = f; 155 } 156 157 pcireg_t 158 gaps_conf_read(void *v, pcitag_t tag, int reg) 159 { 160 struct gaps_softc *sc = v; 161 162 if (tag != GAPS_PCITAG_MAGIC) 163 return -1; 164 165 if ((unsigned int)reg >= PCI_CONF_SIZE) 166 return -1; 167 168 if (reg == (PCI_MAPREG_START + 4)) { 169 /* 170 * We fake the BAR -- just return the physical address 171 * to which the device is mapped. 172 */ 173 return 0x01001700; 174 } 175 176 return bus_space_read_4(sc->sc_memt, sc->sc_pci_memh, reg); 177 } 178 179 void 180 gaps_conf_write(void *v, pcitag_t tag, int reg, pcireg_t val) 181 { 182 struct gaps_softc *sc = v; 183 184 if (tag != GAPS_PCITAG_MAGIC) 185 return; 186 187 if ((unsigned int)reg >= PCI_CONF_SIZE) 188 return; 189 190 /* Disallow writing to the "BAR" ... it doesn't actually exist. */ 191 if (reg == (PCI_MAPREG_START + 4) && val != 0x01000000) 192 return; 193 194 bus_space_write_4(sc->sc_memt, sc->sc_pci_memh, reg, val); 195 } 196 197 int 198 gaps_intr_map(const struct pci_attach_args *pa, pci_intr_handle_t *ihp) 199 { 200 201 *ihp = SYSASIC_EVENT_EXT; 202 return 0; 203 } 204 205 const char * 206 gaps_intr_string(void *v, pci_intr_handle_t ih, 207 char *buf, size_t len) 208 { 209 210 strlcpy(buf, sysasic_intr_string(SYSASIC_IRL11), len); 211 return buf; 212 } 213 214 void * 215 gaps_intr_establish(void *v, pci_intr_handle_t ih, int level, 216 int (*func)(void *), void *arg) 217 { 218 219 return sysasic_intr_establish(ih, level, SYSASIC_IRL11, func, arg); 220 } 221 222 void 223 gaps_intr_disestablish(void *v, void *ih) 224 { 225 226 return sysasic_intr_disestablish(ih); 227 } 228
Indexes created Mon Sep 22 21:09:42 GMT 2025