1 /* $NetBSD: obio.c,v 1.76 2021/08/07 16:19:05 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 1.76 2021/08/07 16:19:05 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 #include <sys/malloc.h> 45 46 #ifdef DEBUG 47 #include <sys/proc.h> 48 #include <sys/syslog.h> 49 #endif 50 51 #include <uvm/uvm_extern.h> 52 53 #include <sys/bus.h> 54 #if NSBUS > 0 55 #include <sparc/dev/sbusvar.h> 56 #endif 57 #include <machine/autoconf.h> 58 #include <machine/oldmon.h> 59 #include <machine/cpu.h> 60 #include <machine/ctlreg.h> 61 #include <sparc/sparc/asm.h> 62 #include <sparc/sparc/vaddrs.h> 63 #include <sparc/sparc/cpuvar.h> 64 65 struct obio4_softc { 66 device_t sc_dev; /* base device */ 67 bus_space_tag_t sc_bustag; /* parent bus tag */ 68 bus_dma_tag_t sc_dmatag; /* parent bus DMA tag */ 69 }; 70 71 union obio_softc { 72 struct obio4_softc sc_obio; /* sun4 obio */ 73 #if NSBUS > 0 74 struct sbus_softc sc_sbus; /* sun4m obio is another sbus slot */ 75 #endif 76 }; 77 78 79 /* autoconfiguration driver */ 80 static int obiomatch(device_t, cfdata_t, void *); 81 static void obioattach(device_t, device_t, void *); 82 83 CFATTACH_DECL_NEW(obio, sizeof(union obio_softc), 84 obiomatch, obioattach, NULL, NULL); 85 86 static int obio_attached; 87 88 /* 89 * This `obio4_busattachargs' data structure only exists to pass down 90 * to obiosearch() the name of a device that must be configured early. 91 */ 92 struct obio4_busattachargs { 93 struct mainbus_attach_args *ma; 94 const char *name; 95 }; 96 97 #if defined(SUN4) 98 static int obioprint(void *, const char *); 99 static int obiosearch(device_t, struct cfdata *, const int *, void *); 100 static paddr_t obio_bus_mmap(bus_space_tag_t, bus_addr_t, off_t, int, int); 101 static int _obio_bus_map(bus_space_tag_t, bus_addr_t, bus_size_t, int, 102 vaddr_t, bus_space_handle_t *); 103 104 /* There's at most one obio bus, so we can allocate the bus tag statically */ 105 static struct sparc_bus_space_tag obio_space_tag; 106 #endif 107 108 #if NSBUS > 0 109 /* 110 * Translate obio `interrupts' property value to processor IPL (see sbus.c) 111 * Apparently, the `interrupts' property on obio devices is just 112 * the processor IPL. 113 */ 114 static int intr_obio2ipl[] = { 115 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 116 }; 117 #endif 118 119 static int 120 obiomatch(device_t parent, struct cfdata *cf, void *aux) 121 { 122 struct mainbus_attach_args *ma = aux; 123 124 if (obio_attached) 125 return 0; 126 127 return (strcmp(cf->cf_name, ma->ma_name) == 0); 128 } 129 130 static void 131 obioattach(device_t parent, device_t self, void *aux) 132 { 133 struct mainbus_attach_args *ma = aux; 134 135 obio_attached = 1; 136 137 printf("\n"); 138 139 if (CPU_ISSUN4) { 140 #if defined(SUN4) 141 union obio_softc *usc = device_private(self); 142 struct obio4_softc *sc = &usc->sc_obio; 143 struct obio4_busattachargs oa; 144 const char *const *cpp; 145 static const char *const special4[] = { 146 /* find these first */ 147 "timer", 148 "dma", /* need this before `esp', if any */ 149 NULL 150 }; 151 152 sc->sc_dev = self; 153 sc->sc_bustag = ma->ma_bustag; 154 sc->sc_dmatag = ma->ma_dmatag; 155 156 memcpy(&obio_space_tag, sc->sc_bustag, sizeof(obio_space_tag)); 157 obio_space_tag.cookie = sc; 158 obio_space_tag.parent = sc->sc_bustag; 159 obio_space_tag.sparc_bus_map = _obio_bus_map; 160 obio_space_tag.sparc_bus_mmap = obio_bus_mmap; 161 162 oa.ma = ma; 163 164 /* Find all `early' obio devices */ 165 for (cpp = special4; *cpp != NULL; cpp++) { 166 oa.name = *cpp; 167 config_search(self, &oa, 168 CFARGS(.search = obiosearch)); 169 } 170 171 /* Find all other obio devices */ 172 oa.name = NULL; 173 config_search(self, &oa, 174 CFARGS(.search = obiosearch)); 175 #endif 176 return; 177 } else if (CPU_ISSUN4M) { 178 #if NSBUS > 0 179 /* 180 * Attach the on-board I/O bus at on a sun4m. 181 * In this case we treat the obio bus as another sbus slot. 182 */ 183 union obio_softc *usc = device_private(self); 184 struct sbus_softc *sc = &usc->sc_sbus; 185 186 static const char *const special4m[] = { 187 /* find these first */ 188 "eeprom", 189 "counter", 190 #if 0 /* Not all sun4m's have an `auxio' */ 191 "auxio", 192 #endif 193 "", 194 /* place device to ignore here */ 195 "interrupt", 196 NULL 197 }; 198 199 sc->sc_dev = self; 200 sc->sc_bustag = ma->ma_bustag; 201 sc->sc_dmatag = ma->ma_dmatag; 202 sc->sc_intr2ipl = intr_obio2ipl; 203 204 sbus_attach_common(sc, "obio", ma->ma_node, special4m); 205 #endif 206 } else { 207 printf("obio on this machine?\n"); 208 } 209 } 210 211 #if defined(SUN4) 212 static int 213 obioprint(void *args, const char *busname) 214 { 215 union obio_attach_args *uoba = args; 216 struct obio4_attach_args *oba = &uoba->uoba_oba4; 217 218 aprint_normal(" addr 0x%lx", (u_long)BUS_ADDR_PADDR(oba->oba_paddr)); 219 if (oba->oba_pri != -1) 220 aprint_normal(" level %d", oba->oba_pri); 221 222 return (UNCONF); 223 } 224 225 static int 226 _obio_bus_map(bus_space_tag_t t, bus_addr_t ba, bus_size_t size, int flags, 227 vaddr_t va, bus_space_handle_t *hp) 228 { 229 230 if ((flags & OBIO_BUS_MAP_USE_ROM) != 0 && 231 obio_find_rom_map(ba, size, hp) == 0) 232 return (0); 233 234 return (bus_space_map2(t->parent, ba, size, flags, va, hp)); 235 } 236 237 static paddr_t 238 obio_bus_mmap(bus_space_tag_t t, bus_addr_t ba, off_t off, int prot, int flags) 239 { 240 241 return (bus_space_mmap(t->parent, ba, off, prot, flags)); 242 } 243 244 static int 245 obiosearch(device_t parent, struct cfdata *cf, const int *ldesc, 246 void *aux) 247 { 248 struct obio4_busattachargs *oap = aux; 249 union obio_attach_args uoba; 250 struct obio4_attach_args *oba = &uoba.uoba_oba4; 251 int addr; 252 253 /* Check whether we're looking for a specifically named device */ 254 if (oap->name != NULL && strcmp(oap->name, cf->cf_name) != 0) 255 return (0); 256 257 /* 258 * Avoid sun4m entries which don't have valid PAs. 259 * no point in even probing them. 260 */ 261 addr = cf->cf_loc[OBIOCF_ADDR]; 262 if (addr == -1) 263 return (0); 264 265 /* 266 * On the 4/100 obio addresses must be mapped at 267 * 0x0YYYYYYY, but alias higher up (we avoid the 268 * alias condition because it causes pmap difficulties) 269 * XXX: We also assume that 4/[23]00 obio addresses 270 * must be 0xZYYYYYYY, where (Z != 0) 271 */ 272 if (cpuinfo.cpu_type == CPUTYP_4_100 && (addr & 0xf0000000)) 273 return (0); 274 if (cpuinfo.cpu_type != CPUTYP_4_100 && !(addr & 0xf0000000)) 275 return (0); 276 277 uoba.uoba_isobio4 = 1; 278 oba->oba_bustag = &obio_space_tag; 279 oba->oba_dmatag = oap->ma->ma_dmatag; 280 oba->oba_paddr = BUS_ADDR(PMAP_OBIO, addr); 281 oba->oba_pri = cf->cf_loc[OBIOCF_LEVEL]; 282 283 if (!config_probe(parent, cf, &uoba)) 284 return (0); 285 286 config_attach(parent, cf, &uoba, obioprint, CFARGS_NONE); 287 return (1); 288 } 289 290 291 /* 292 * If we can find a mapping that was established by the rom, use it. 293 * Else, create a new mapping. 294 */ 295 int 296 obio_find_rom_map(bus_addr_t ba, int len, bus_space_handle_t *hp) 297 { 298 #define getpte(va) lda(va, ASI_PTE) 299 300 u_long pa, pf; 301 int pgtype; 302 u_long va, pte; 303 304 if (len > PAGE_SIZE) 305 return (EINVAL); 306 307 pa = BUS_ADDR_PADDR(ba); 308 pf = pa >> PGSHIFT; 309 pgtype = PMAP_T2PTE_4(PMAP_OBIO); 310 311 for (va = OLDMON_STARTVADDR; va < OLDMON_ENDVADDR; va += PAGE_SIZE) { 312 pte = getpte(va); 313 if ((pte & PG_V) == 0 || (pte & PG_TYPE) != pgtype || 314 (pte & PG_PFNUM) != pf) 315 continue; 316 317 /* 318 * Found entry in PROM's pagetable 319 * note: preserve page offset 320 */ 321 *hp = (bus_space_handle_t)(va | (pa & PGOFSET)); 322 return (0); 323 } 324 325 return (ENOENT); 326 } 327 #endif /* SUN4 */ 328