1 /* $NetBSD: obio.c,v 1.21 2021/08/07 16:19:06 thorpej Exp $ */ 2 3 /*- 4 * Copyright (c) 1996 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Adam Glass, Gordon W. Ross, and Matthew Fredette. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __KERNEL_RCSID(0, "$NetBSD: obio.c,v 1.21 2021/08/07 16:19:06 thorpej Exp $"); 34 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/device.h> 38 39 #include <uvm/uvm_extern.h> 40 41 #include <machine/autoconf.h> 42 #include <machine/pmap.h> 43 #include <machine/pte.h> 44 45 #include <sun2/sun2/control.h> 46 #include <sun2/sun2/machdep.h> 47 48 /* Does this machine have a Multibus? */ 49 extern int cpu_has_multibus; 50 51 static int obio_match(device_t, cfdata_t, void *); 52 static void obio_attach(device_t, device_t, void *); 53 54 struct obio_softc { 55 device_t sc_dev; /* base device */ 56 bus_space_tag_t sc_bustag; /* parent bus tag */ 57 bus_dma_tag_t sc_dmatag; /* parent bus dma tag */ 58 }; 59 60 CFATTACH_DECL_NEW(obio, sizeof(struct obio_softc), 61 obio_match, obio_attach, NULL, NULL); 62 63 static int obio_attached; 64 65 static paddr_t obio_bus_mmap(bus_space_tag_t, bus_type_t, bus_addr_t, off_t, 66 int, int); 67 static int _obio_bus_map(bus_space_tag_t, bus_type_t, bus_addr_t, bus_size_t, 68 int, vaddr_t, bus_space_handle_t *); 69 static int _obio_addr_bad(bus_space_tag_t, bus_space_handle_t, bus_size_t, 70 size_t); 71 static int _obio_bus_peek(bus_space_tag_t, bus_space_handle_t, bus_size_t, 72 size_t, void *); 73 static int _obio_bus_poke(bus_space_tag_t, bus_space_handle_t, bus_size_t, 74 size_t, uint32_t); 75 76 static struct sun68k_bus_space_tag obio_space_tag = { 77 NULL, /* cookie */ 78 NULL, /* parent bus tag */ 79 _obio_bus_map, /* bus_space_map */ 80 NULL, /* bus_space_unmap */ 81 NULL, /* bus_space_subregion */ 82 NULL, /* bus_space_barrier */ 83 obio_bus_mmap, /* bus_space_mmap */ 84 NULL, /* bus_intr_establish */ 85 _obio_bus_peek, /* bus_space_peek_N */ 86 _obio_bus_poke /* bus_space_poke_N */ 87 }; 88 89 static int 90 obio_match(device_t parent, cfdata_t cf, void *aux) 91 { 92 struct mainbus_attach_args *ma = aux; 93 94 if (obio_attached) 95 return 0; 96 97 return ma->ma_name == NULL || strcmp(cf->cf_name, ma->ma_name) == 0; 98 } 99 100 static void 101 obio_attach(device_t parent, device_t self, void *aux) 102 { 103 struct mainbus_attach_args *ma = aux; 104 struct obio_softc *sc = device_private(self); 105 struct obio_attach_args oba; 106 const char *const *cpp; 107 static const char *const special[] = { 108 /* find these first */ 109 NULL 110 }; 111 112 obio_attached = 1; 113 114 sc->sc_dev = self; 115 aprint_normal("\n"); 116 117 sc->sc_bustag = ma->ma_bustag; 118 sc->sc_dmatag = ma->ma_dmatag; 119 120 obio_space_tag.cookie = sc; 121 obio_space_tag.parent = sc->sc_bustag; 122 123 /* 124 * Prepare the skeleton attach arguments for our devices. 125 * The values we give in the locators are indications to 126 * sun68k_bus_search about which locators must and must not 127 * be defined. 128 */ 129 oba = *ma; 130 oba.oba_bustag = &obio_space_tag; 131 oba.oba_paddr = LOCATOR_REQUIRED; 132 oba.oba_pri = LOCATOR_OPTIONAL; 133 134 /* Find all `early' obio devices */ 135 for (cpp = special; *cpp != NULL; cpp++) { 136 oba.oba_name = *cpp; 137 config_search(self, &oba, 138 CFARGS(.search = sun68k_bus_search)); 139 } 140 141 /* Find all other obio devices */ 142 oba.oba_name = NULL; 143 config_search(self, &oba, 144 CFARGS(.search = sun68k_bus_search)); 145 } 146 147 int 148 _obio_bus_map(bus_space_tag_t t, bus_type_t btype, bus_addr_t paddr, 149 bus_size_t size, int flags, vaddr_t vaddr, bus_space_handle_t *hp) 150 { 151 struct obio_softc *sc = t->cookie; 152 153 return bus_space_map2(sc->sc_bustag, PMAP_OBIO, paddr, size, 154 flags | _SUN68K_BUS_MAP_USE_PROM, vaddr, hp); 155 } 156 157 paddr_t 158 obio_bus_mmap(bus_space_tag_t t, bus_type_t btype, bus_addr_t paddr, off_t off, 159 int prot, int flags) 160 { 161 struct obio_softc *sc = t->cookie; 162 163 return bus_space_mmap2(sc->sc_bustag, PMAP_OBIO, paddr, off, 164 prot, flags); 165 } 166 167 /* 168 * The sun2 obio bus doesn't give bus errors, so we check on 169 * probed obio physical addresses to make sure they're ok. 170 */ 171 int 172 _obio_addr_bad(bus_space_tag_t t, bus_space_handle_t h, bus_size_t o, size_t s) 173 { 174 u_int pte; 175 paddr_t pa; 176 177 /* Get the physical address for this page. */ 178 pte = get_pte((vaddr_t) (h + o)); 179 if ((pte & PG_VALID) == 0) 180 return -1; 181 pa = PG_PA(pte); 182 183 /* 184 * Return nonzero if it's bad. All sun2 Multibus 185 * machines have all obio devices between 0x2000 186 * and 0x4000, and all sun2 VME machines have all 187 * obio devices outside of this range. 188 */ 189 return (!!cpu_has_multibus) != (pa >= 0x2000 && pa < 0x4000); 190 } 191 192 int 193 _obio_bus_peek(bus_space_tag_t t, bus_space_handle_t h, bus_size_t o, size_t s, 194 void *vp) 195 { 196 struct obio_softc *sc = t->cookie; 197 198 return _obio_addr_bad(t, h, o, s) || 199 _bus_space_peek(sc->sc_bustag, h, o, s, vp); 200 } 201 202 int 203 _obio_bus_poke(bus_space_tag_t t, bus_space_handle_t h, bus_size_t o, size_t s, 204 uint32_t v) 205 { 206 struct obio_softc *sc = t->cookie; 207 208 return _obio_addr_bad(t, h, o, s) || 209 _bus_space_poke(sc->sc_bustag, h, o, s, v); 210 } 211
Indexes created Sun Oct 25 00:26:45 UTC 2026