1 /* $NetBSD: gapspci_pci.c,v 1.12 2010/11/21 16:11:32 tsutsui 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 configuraiton 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 1.12 2010/11/21 16:11:32 tsutsui Exp $"); 42 43 #include <sys/param.h> 44 #include <sys/systm.h> 45 #include <sys/kernel.h> 46 #include <sys/device.h> 47 48 #include <machine/cpu.h> 49 #include <machine/bus.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(struct pci_attach_args *, pci_intr_handle_t *); 66 const char *gaps_intr_string(void *, pci_intr_handle_t); 67 void *gaps_intr_establish(void *, pci_intr_handle_t, 68 int, int (*)(void *), void *); 69 void gaps_intr_disestablish(void *, void *); 70 71 void 72 gaps_pci_init(struct gaps_softc *sc) 73 { 74 pci_chipset_tag_t pc = &sc->sc_pc; 75 76 memset(pc, 0, sizeof(*pc)); 77 78 pc->pc_attach_hook = gaps_attach_hook; 79 pc->pc_bus_maxdevs = gaps_bus_maxdevs; 80 pc->pc_make_tag = gaps_make_tag; 81 pc->pc_decompose_tag = gaps_decompose_tag; 82 pc->pc_conf_read = gaps_conf_read; 83 pc->pc_conf_write = gaps_conf_write; 84 pc->pc_conf_v = sc; 85 86 pc->pc_intr_map = gaps_intr_map; 87 pc->pc_intr_string = gaps_intr_string; 88 pc->pc_intr_establish = gaps_intr_establish; 89 pc->pc_intr_disestablish = gaps_intr_disestablish; 90 91 if (bus_space_map(sc->sc_memt, 0x01001600, 0x100, 92 0, &sc->sc_pci_memh) != 0) 93 panic("gaps_pci_init: can't map PCI configuration space"); 94 } 95 96 #define GAPS_PCITAG_MAGIC 0x022473 97 98 void 99 gaps_attach_hook(device_t parent, device_t pci, struct pcibus_attach_args *pba) 100 { 101 struct gaps_softc *sc = device_private(parent); 102 103 /* 104 * Now that we know there's a bus configured, go ahead and 105 * program the BAR on the device. 106 */ 107 pci_conf_write(&sc->sc_pc, GAPS_PCITAG_MAGIC, 108 PCI_MAPREG_START + 4, 0x01000000); 109 pci_conf_write(&sc->sc_pc, GAPS_PCITAG_MAGIC, PCI_COMMAND_STATUS_REG, 110 pci_conf_read(&sc->sc_pc, 0, PCI_COMMAND_STATUS_REG) | 111 PCI_COMMAND_MEM_ENABLE | PCI_COMMAND_MASTER_ENABLE); 112 } 113 114 int 115 gaps_bus_maxdevs(void *v, int bus) 116 { 117 118 return 1; 119 } 120 121 pcitag_t 122 gaps_make_tag(void *v, int bus, int dev, int func) 123 { 124 125 if (bus == 0 && dev == 0 && func == 0) 126 return GAPS_PCITAG_MAGIC; 127 128 return 0; 129 } 130 131 void 132 gaps_decompose_tag(void *v, pcitag_t tag, int *bp, int *dp, int *fp) 133 { 134 int b, d, f; 135 136 if (tag == GAPS_PCITAG_MAGIC) 137 b = d = f = 0; 138 else { 139 /* 140 * Invalid for GAPS. These values ensure that a valid 141 * tag cannot be built. 142 */ 143 b = 0xff; 144 d = 0x1f; 145 f = 0x7; 146 } 147 148 if (bp != NULL) 149 *bp = b; 150 if (dp != NULL) 151 *dp = d; 152 if (fp != NULL) 153 *fp = f; 154 } 155 156 pcireg_t 157 gaps_conf_read(void *v, pcitag_t tag, int reg) 158 { 159 struct gaps_softc *sc = v; 160 161 if (tag != GAPS_PCITAG_MAGIC) 162 return -1; 163 164 if (reg == (PCI_MAPREG_START + 4)) { 165 /* 166 * We fake the BAR -- just return the physical address 167 * to which the device is mapped. 168 */ 169 return 0x01001700; 170 } 171 172 return bus_space_read_4(sc->sc_memt, sc->sc_pci_memh, reg); 173 } 174 175 void 176 gaps_conf_write(void *v, pcitag_t tag, int reg, pcireg_t val) 177 { 178 struct gaps_softc *sc = v; 179 180 if (tag != GAPS_PCITAG_MAGIC) 181 return; 182 183 /* Disallow writing to the "BAR" ... it doesn't actually exist. */ 184 if (reg == (PCI_MAPREG_START + 4) && val != 0x01000000) 185 return; 186 187 bus_space_write_4(sc->sc_memt, sc->sc_pci_memh, reg, val); 188 } 189 190 int 191 gaps_intr_map(struct pci_attach_args *pa, pci_intr_handle_t *ihp) 192 { 193 194 *ihp = SYSASIC_EVENT_EXT; 195 return 0; 196 } 197 198 const char * 199 gaps_intr_string(void *v, pci_intr_handle_t ih) 200 { 201 202 return sysasic_intr_string(SYSASIC_IRL11); 203 } 204 205 void * 206 gaps_intr_establish(void *v, pci_intr_handle_t ih, int level, 207 int (*func)(void *), void *arg) 208 { 209 210 return sysasic_intr_establish(ih, level, SYSASIC_IRL11, func, arg); 211 } 212 213 void 214 gaps_intr_disestablish(void *v, void *ih) 215 { 216 217 return sysasic_intr_disestablish(ih); 218 } 219