1 /* $NetBSD: obio.c,v 1.77 2023/12/20 05:33:18 thorpej Exp $ */ 2 3 /*- 4 * Copyright (c) 1997,1998 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Paul Kranenburg. 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 1.77 2023/12/20 05:33:18 thorpej Exp $"); 34 35 #include "locators.h" 36 37 #ifdef _KERNEL_OPT 38 #include "sbus.h" 39 #endif 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/device.h> 44 45 #ifdef DEBUG 46 #include <sys/proc.h> 47 #include <sys/syslog.h> 48 #endif 49 50 #include <uvm/uvm_extern.h> 51 52 #include <sys/bus.h> 53 #if NSBUS > 0 54 #include <sparc/dev/sbusvar.h> 55 #endif 56 #include <machine/autoconf.h> 57 #include <machine/oldmon.h> 58 #include <machine/cpu.h> 59 #include <machine/ctlreg.h> 60 #include <sparc/sparc/asm.h> 61 #include <sparc/sparc/vaddrs.h> 62 #include <sparc/sparc/cpuvar.h> 63 64 struct obio4_softc { 65 device_t sc_dev; /* base device */ 66 bus_space_tag_t sc_bustag; /* parent bus tag */ 67 bus_dma_tag_t sc_dmatag; /* parent bus DMA tag */ 68 }; 69 70 union obio_softc { 71 struct obio4_softc sc_obio; /* sun4 obio */ 72 #if NSBUS > 0 73 struct sbus_softc sc_sbus; /* sun4m obio is another sbus slot */ 74 #endif 75 }; 76 77 78 /* autoconfiguration driver */ 79 static int obiomatch(device_t, cfdata_t, void *); 80 static void obioattach(device_t, device_t, void *); 81 82 CFATTACH_DECL_NEW(obio, sizeof(union obio_softc), 83 obiomatch, obioattach, NULL, NULL); 84 85 static int obio_attached; 86 87 /* 88 * This `obio4_busattachargs' data structure only exists to pass down 89 * to obiosearch() the name of a device that must be configured early. 90 */ 91 struct obio4_busattachargs { 92 struct mainbus_attach_args *ma; 93 const char *name; 94 }; 95 96 #if defined(SUN4) 97 static int obioprint(void *, const char *); 98 static int obiosearch(device_t, struct cfdata *, const int *, void *); 99 static paddr_t obio_bus_mmap(bus_space_tag_t, bus_addr_t, off_t, int, int); 100 static int _obio_bus_map(bus_space_tag_t, bus_addr_t, bus_size_t, int, 101 vaddr_t, bus_space_handle_t *); 102 103 /* There's at most one obio bus, so we can allocate the bus tag statically */ 104 static struct sparc_bus_space_tag obio_space_tag; 105 #endif 106 107 #if NSBUS > 0 108 /* 109 * Translate obio `interrupts' property value to processor IPL (see sbus.c) 110 * Apparently, the `interrupts' property on obio devices is just 111 * the processor IPL. 112 */ 113 static int intr_obio2ipl[] = { 114 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 115 }; 116 #endif 117 118 static int 119 obiomatch(device_t parent, struct cfdata *cf, void *aux) 120 { 121 struct mainbus_attach_args *ma = aux; 122 123 if (obio_attached) 124 return 0; 125 126 return (strcmp(cf->cf_name, ma->ma_name) == 0); 127 } 128 129 static void 130 obioattach(device_t parent, device_t self, void *aux) 131 { 132 struct mainbus_attach_args *ma = aux; 133 134 obio_attached = 1; 135 136 printf("\n"); 137 138 if (CPU_ISSUN4) { 139 #if defined(SUN4) 140 union obio_softc *usc = device_private(self); 141 struct obio4_softc *sc = &usc->sc_obio; 142 struct obio4_busattachargs oa; 143 const char *const *cpp; 144 static const char *const special4[] = { 145 /* find these first */ 146 "timer", 147 "dma", /* need this before `esp', if any */ 148 NULL 149 }; 150 151 sc->sc_dev = self; 152 sc->sc_bustag = ma->ma_bustag; 153 sc->sc_dmatag = ma->ma_dmatag; 154 155 memcpy(&obio_space_tag, sc->sc_bustag, sizeof(obio_space_tag)); 156 obio_space_tag.cookie = sc; 157 obio_space_tag.parent = sc->sc_bustag; 158 obio_space_tag.sparc_bus_map = _obio_bus_map; 159 obio_space_tag.sparc_bus_mmap = obio_bus_mmap; 160 161 oa.ma = ma; 162 163 /* Find all `early' obio devices */ 164 for (cpp = special4; *cpp != NULL; cpp++) { 165 oa.name = *cpp; 166 config_search(self, &oa, 167 CFARGS(.search = obiosearch)); 168 } 169 170 /* Find all other obio devices */ 171 oa.name = NULL; 172 config_search(self, &oa, 173 CFARGS(.search = obiosearch)); 174 #endif 175 return; 176 } else if (CPU_ISSUN4M) { 177 #if NSBUS > 0 178 /* 179 * Attach the on-board I/O bus at on a sun4m. 180 * In this case we treat the obio bus as another sbus slot. 181 */ 182 union obio_softc *usc = device_private(self); 183 struct sbus_softc *sc = &usc->sc_sbus; 184 185 static const char *const special4m[] = { 186 /* find these first */ 187 "eeprom", 188 "counter", 189 #if 0 /* Not all sun4m's have an `auxio' */ 190 "auxio", 191 #endif 192 "", 193 /* place device to ignore here */ 194 "interrupt", 195 NULL 196 }; 197 198 sc->sc_dev = self; 199 sc->sc_bustag = ma->ma_bustag; 200 sc->sc_dmatag = ma->ma_dmatag; 201 sc->sc_intr2ipl = intr_obio2ipl; 202 203 sbus_attach_common(sc, "obio", ma->ma_node, special4m); 204 #endif 205 } else { 206 printf("obio on this machine?\n"); 207 } 208 } 209 210 #if defined(SUN4) 211 static int 212 obioprint(void *args, const char *busname) 213 { 214 union obio_attach_args *uoba = args; 215 struct obio4_attach_args *oba = &uoba->uoba_oba4; 216 217 aprint_normal(" addr 0x%lx", (u_long)BUS_ADDR_PADDR(oba->oba_paddr)); 218 if (oba->oba_pri != -1) 219 aprint_normal(" level %d", oba->oba_pri); 220 221 return (UNCONF); 222 } 223 224 static int 225 _obio_bus_map(bus_space_tag_t t, bus_addr_t ba, bus_size_t size, int flags, 226 vaddr_t va, bus_space_handle_t *hp) 227 { 228 229 if ((flags & OBIO_BUS_MAP_USE_ROM) != 0 && 230 obio_find_rom_map(ba, size, hp) == 0) 231 return (0); 232 233 return (bus_space_map2(t->parent, ba, size, flags, va, hp)); 234 } 235 236 static paddr_t 237 obio_bus_mmap(bus_space_tag_t t, bus_addr_t ba, off_t off, int prot, int flags) 238 { 239 240 return (bus_space_mmap(t->parent, ba, off, prot, flags)); 241 } 242 243 static int 244 obiosearch(device_t parent, struct cfdata *cf, const int *ldesc, 245 void *aux) 246 { 247 struct obio4_busattachargs *oap = aux; 248 union obio_attach_args uoba; 249 struct obio4_attach_args *oba = &uoba.uoba_oba4; 250 int addr; 251 252 /* Check whether we're looking for a specifically named device */ 253 if (oap->name != NULL && strcmp(oap->name, cf->cf_name) != 0) 254 return (0); 255 256 /* 257 * Avoid sun4m entries which don't have valid PAs. 258 * no point in even probing them. 259 */ 260 addr = cf->cf_loc[OBIOCF_ADDR]; 261 if (addr == -1) 262 return (0); 263 264 /* 265 * On the 4/100 obio addresses must be mapped at 266 * 0x0YYYYYYY, but alias higher up (we avoid the 267 * alias condition because it causes pmap difficulties) 268 * XXX: We also assume that 4/[23]00 obio addresses 269 * must be 0xZYYYYYYY, where (Z != 0) 270 */ 271 if (cpuinfo.cpu_type == CPUTYP_4_100 && (addr & 0xf0000000)) 272 return (0); 273 if (cpuinfo.cpu_type != CPUTYP_4_100 && !(addr & 0xf0000000)) 274 return (0); 275 276 uoba.uoba_isobio4 = 1; 277 oba->oba_bustag = &obio_space_tag; 278 oba->oba_dmatag = oap->ma->ma_dmatag; 279 oba->oba_paddr = BUS_ADDR(PMAP_OBIO, addr); 280 oba->oba_pri = cf->cf_loc[OBIOCF_LEVEL]; 281 282 if (!config_probe(parent, cf, &uoba)) 283 return (0); 284 285 config_attach(parent, cf, &uoba, obioprint, CFARGS_NONE); 286 return (1); 287 } 288 289 290 /* 291 * If we can find a mapping that was established by the rom, use it. 292 * Else, create a new mapping. 293 */ 294 int 295 obio_find_rom_map(bus_addr_t ba, int len, bus_space_handle_t *hp) 296 { 297 #define getpte(va) lda(va, ASI_PTE) 298 299 u_long pa, pf; 300 int pgtype; 301 u_long va, pte; 302 303 if (len > PAGE_SIZE) 304 return (EINVAL); 305 306 pa = BUS_ADDR_PADDR(ba); 307 pf = pa >> PGSHIFT; 308 pgtype = PMAP_T2PTE_4(PMAP_OBIO); 309 310 for (va = OLDMON_STARTVADDR; va < OLDMON_ENDVADDR; va += PAGE_SIZE) { 311 pte = getpte(va); 312 if ((pte & PG_V) == 0 || (pte & PG_TYPE) != pgtype || 313 (pte & PG_PFNUM) != pf) 314 continue; 315 316 /* 317 * Found entry in PROM's pagetable 318 * note: preserve page offset 319 */ 320 *hp = (bus_space_handle_t)(va | (pa & PGOFSET)); 321 return (0); 322 } 323 324 return (ENOENT); 325 } 326 #endif /* SUN4 */ 327
Indexes created Sat Sep 20 22:09:52 GMT 2025