obio.c revision 1.31
1/* $NetBSD: obio.c,v 1.31 2008/04/28 20:23:38 martin 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 and Gordon W. Ross. 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 1.31 2008/04/28 20:23:38 martin 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#define _SUN68K_BUS_DMA_PRIVATE 42#include <machine/autoconf.h> 43#include <machine/bus.h> 44#include <machine/dvma.h> 45#include <machine/mon.h> 46#include <machine/pte.h> 47 48#include <sun3/sun3/machdep.h> 49#include <sun3/sun3x/obio.h> 50 51static int obio_match(struct device *, struct cfdata *, void *); 52static void obio_attach(struct device *, struct device *, void *); 53static int obio_print(void *, const char *); 54static int obio_submatch(struct device *, struct cfdata *, 55 const int *, void *); 56 57struct obio_softc { 58 struct device sc_dev; 59 bus_space_tag_t sc_bustag; 60 bus_dma_tag_t sc_dmatag; 61}; 62CFATTACH_DECL(obio, sizeof(struct obio_softc), 63 obio_match, obio_attach, NULL, NULL); 64 65static int obio_attached; 66 67static 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 *); 69static paddr_t obio_bus_mmap(bus_space_tag_t, bus_type_t, bus_addr_t, 70 off_t, int, int); 71static int obio_dmamap_load(bus_dma_tag_t, bus_dmamap_t, void *, bus_size_t, 72 struct proc *, int); 73 74static struct sun68k_bus_space_tag obio_space_tag = { 75 NULL, /* cookie */ 76 NULL, /* parent bus space tag */ 77 obio_bus_map, /* bus_space_map */ 78 NULL, /* bus_space_unmap */ 79 NULL, /* bus_space_subregion */ 80 NULL, /* bus_space_barrier */ 81 obio_bus_mmap, /* bus_space_mmap */ 82 NULL, /* bus_intr_establish */ 83 NULL, /* bus_space_peek_N */ 84 NULL /* bus_space_poke_N */ 85}; 86 87static struct sun68k_bus_dma_tag obio_dma_tag; 88 89static int 90obio_match(struct device *parent, struct cfdata *cf, void *aux) 91{ 92 struct confargs *ca = aux; 93 94 if (obio_attached) 95 return 0; 96 97 if (ca->ca_bustype != BUS_OBIO) 98 return 0; 99 100 if (ca->ca_name != NULL && strcmp(cf->cf_name, ca->ca_name) != 0) 101 return 0; 102 103 return 1; 104} 105 106/* 107 * We need control over the order of attachment on OBIO, 108 * so do "direct" style autoconfiguration with addresses 109 * from the list below. OBIO addresses are fixed forever. 110 * 111 * Warning: This whole list is very carefully ordered! 112 * In general, anything not already shown here should 113 * be added at or near the end. 114 */ 115static paddr_t obio_alist[] = { 116 117 /* This is used by the Ethernet and SCSI drivers. */ 118 OBIO_IOMMU, 119 120 /* Misc. registers - needed by many things */ 121 OBIO_ENABLEREG, 122 OBIO_BUSERRREG, 123 OBIO_DIAGREG, /* leds.c */ 124 OBIO_IDPROM1, /* idprom.c (3/470) */ 125 OBIO_MEMREG, /* memerr.c */ 126 OBIO_INTERREG, /* intreg.c */ 127 128 /* Zilog UARTs */ 129 OBIO_ZS_KBD_MS, 130 OBIO_ZS_TTY_AB, 131 132 /* eeprom.c */ 133 OBIO_EEPROM, 134 135 /* Note: This must come after OBIO_IDPROM1. */ 136 OBIO_IDPROM2, /* idprom.c (3/80) */ 137 138 /* Note: Must probe for the Intersil first! */ 139 OBIO_CLOCK1, /* clock.c (3/470) */ 140 OBIO_CLOCK2, /* clock.c (3/80) */ 141 142 OBIO_INTEL_ETHER, 143 OBIO_LANCE_ETHER, 144 145 /* Need esp DMA before SCSI. */ 146 OBIO_EMULEX_DMA, /* 3/80 only */ 147 OBIO_EMULEX_SCSI, /* 3/80 only */ 148 149 /* Memory subsystem */ 150 OBIO_PCACHE_TAGS, 151 OBIO_ECCPARREG, 152 OBIO_IOC_TAGS, 153 OBIO_IOC_FLUSH, 154 155 OBIO_FDC, /* floppy disk (3/80) */ 156 OBIO_PRINTER_PORT, /* printer port (3/80) */ 157}; 158#define OBIO_ALIST_LEN __arraycount(obio_alist) 159 160static void 161obio_attach(struct device *parent, struct device *self, void *aux) 162{ 163 struct confargs *ca = aux; 164 struct obio_softc *sc = (void *)self; 165 struct confargs oba; 166 int i; 167 168 obio_attached = 1; 169 170 printf("\n"); 171 172 sc->sc_bustag = ca->ca_bustag; 173 sc->sc_dmatag = ca->ca_dmatag; 174 175 obio_space_tag.cookie = sc; 176 obio_space_tag.parent = sc->sc_bustag; 177 178 obio_dma_tag = *sc->sc_dmatag; 179 obio_dma_tag._cookie = sc; 180 obio_dma_tag._dmamap_load = obio_dmamap_load; 181 182 oba = *ca; 183 oba.ca_bustag = &obio_space_tag; 184 oba.ca_dmatag = &obio_dma_tag; 185 186 /* Configure these in the order listed above. */ 187 for (i = 0; i < OBIO_ALIST_LEN; i++) { 188 /* Our parent set ca->ca_bustype already. */ 189 oba.ca_paddr = obio_alist[i]; 190 /* These are filled-in by obio_submatch. */ 191 oba.ca_intpri = -1; 192 oba.ca_intvec = -1; 193 (void)config_found_sm_loc(self, "obio", NULL, &oba, obio_print, 194 obio_submatch); 195 } 196} 197 198/* 199 * Print out the confargs. The (parent) name is non-NULL 200 * when there was no match found by config_found(). 201 */ 202static int 203obio_print(void *args, const char *name) 204{ 205 206 /* Be quiet about empty OBIO locations. */ 207 if (name) 208 return QUIET; 209 210 /* Otherwise do the usual. */ 211 return bus_print(args, name); 212} 213 214int 215obio_submatch(struct device *parent, struct cfdata *cf, const int *ldesc, 216 void *aux) 217{ 218 struct confargs *ca = aux; 219 220 /* 221 * Note that a defaulted address locator can never match 222 * the value of ca->ca_paddr set by the obio_attach loop. 223 * Without this diagnostic, any device with a defaulted 224 * address locator would always be silently unmatched. 225 * Therefore, just disallow default addresses on OBIO. 226 */ 227#ifdef DIAGNOSTIC 228 if (cf->cf_paddr == -1) 229 panic("%s: invalid address for: %s%d", 230 __func__, cf->cf_name, cf->cf_unit); 231#endif 232 233 /* 234 * Note that obio_attach calls config_found_sm() with 235 * this function as the "submatch" and ca->ca_paddr 236 * set to each of the possible OBIO locations, so we 237 * want to reject any unmatched address here. 238 */ 239 if (cf->cf_paddr != ca->ca_paddr) 240 return 0; 241 242 /* 243 * Copy the locators into our confargs for the child. 244 * Note: ca->ca_bustype was set by our parent driver 245 * (mainbus) and ca->ca_paddr was set by obio_attach. 246 */ 247 ca->ca_intpri = cf->cf_intpri; 248 ca->ca_intvec = cf->cf_intvec; 249 250 /* Now call the match function of the potential child. */ 251 return config_match(parent, cf, aux); 252} 253 254 255/*****************************************************************/ 256 257/* 258 * This is our record of "interesting" OBIO mappings that 259 * the PROM has left in the virtual space reserved for it. 260 * Each row of the array holds a virtual address and the 261 * physical address it maps to (if found). 262 */ 263static struct prom_map { 264 paddr_t pa; 265 vaddr_t va; 266} prom_mappings[] = { 267 { OBIO_ENABLEREG, 0 }, /* regs: Sys ENA, Bus ERR, etc. */ 268 { OBIO_ZS_KBD_MS, 0 }, /* Keyboard and Mouse */ 269 { OBIO_ZS_TTY_AB, 0 }, /* Serial Ports */ 270 { OBIO_EEPROM, 0 }, /* EEPROM/IDPROM/clock */ 271}; 272#define PROM_MAP_CNT __arraycount(prom_mappings) 273 274/* 275 * Find a virtual address for a device at physical address 'pa'. 276 * If one is found among the mappings already made by the PROM 277 * at power-up time, use it and return 0. Otherwise return errno 278 * as a sign that a mapping will have to be created. 279 */ 280int 281find_prom_map(paddr_t pa, bus_type_t iospace, int sz, vaddr_t *vap) 282{ 283 int i; 284 vsize_t off; 285 286 off = pa & PGOFSET; 287 pa -= off; 288 sz += off; 289 290 /* The saved mappings are all one page long. */ 291 if (sz > PAGE_SIZE) 292 return EINVAL; 293 294 /* Linear search for it. The list is short. */ 295 for (i = 0; i < PROM_MAP_CNT; i++) { 296 if (pa == prom_mappings[i].pa) { 297 *vap = prom_mappings[i].va + off; 298 return 0; 299 } 300 } 301 return ENOENT; 302} 303 304/* 305 * Search the PROM page tables for OBIO mappings that 306 * we would like to borrow. 307 */ 308static void 309save_prom_mappings(void) 310{ 311 int *mon_pte; 312 vaddr_t va; 313 paddr_t pa; 314 int i; 315 316 /* Note: mon_ctbl[0] maps SUN3X_MON_KDB_BASE */ 317 mon_pte = *romVectorPtr->monptaddr; 318 319 for (va = SUN3X_MON_KDB_BASE; va < SUN3X_MONEND; 320 va += PAGE_SIZE, mon_pte++) { 321 /* Is this a valid mapping to OBIO? */ 322 /* XXX - Some macros would be nice... */ 323 if ((*mon_pte & 0xF0000003) != 0x60000001) 324 continue; 325 326 /* Yes it is. Is this a mapping we want? */ 327 pa = *mon_pte & MMU_SHORT_PTE_BASEADDR; 328 for (i = 0; i < PROM_MAP_CNT; i++) { 329 if (pa != prom_mappings[i].pa) 330 continue; 331 /* Yes, we want it. Save the va? */ 332 if (prom_mappings[i].va == 0) { 333 prom_mappings[i].va = va; 334 } 335 } 336 } 337} 338 339/* 340 * These are all the OBIO address that are required early in 341 * the life of the kernel. All are less than one page long. 342 * This function should make any required mappings that we 343 * were not able to find among the PROM monitor's mappings. 344 */ 345static void 346make_required_mappings(void) 347{ 348 int i; 349 350 for (i = 0; i < PROM_MAP_CNT; i++) { 351 if (prom_mappings[i].va == 0) { 352 /* 353 * Actually, the PROM always has all the 354 * "required" mappings we need, (smile) 355 * but this makes sure that is true. 356 */ 357 mon_printf("obio: no mapping for pa=0x%x\n", 358 prom_mappings[i].pa); 359 sunmon_abort(); /* Ancient PROM? */ 360 } 361 } 362} 363 364 365/* 366 * Find mappings for devices that are needed before autoconfiguration. 367 * We first look for and record any useful PROM mappings, then call 368 * the "init" functions for drivers that we need to use before the 369 * normal autoconfiguration calls configure(). Warning: this is 370 * called before pmap_bootstrap, so no allocation allowed! 371 */ 372void 373obio_init(void) 374{ 375 376 save_prom_mappings(); 377 make_required_mappings(); 378 379 enable_init(); 380 381 /* 382 * Find the interrupt reg mapping and turn off the 383 * interrupts, otherwise the PROM clock interrupt 384 * would poll the zs and toggle some LEDs... 385 */ 386 intreg_init(); 387} 388 389int 390obio_bus_map(bus_space_tag_t t, bus_type_t btype, bus_addr_t paddr, 391 bus_size_t size, int flags, vaddr_t vaddr, bus_space_handle_t *hp) 392{ 393 struct obio_softc *sc = t->cookie; 394 395 return bus_space_map2(sc->sc_bustag, PMAP_OBIO, paddr, size, 396 flags | _SUN68K_BUS_MAP_USE_PROM, vaddr, hp); 397} 398 399paddr_t 400obio_bus_mmap(bus_space_tag_t t, bus_type_t btype, bus_addr_t paddr, off_t off, 401 int prot, int flags) 402{ 403 struct obio_softc *sc = t->cookie; 404 405 return bus_space_mmap2(sc->sc_bustag, PMAP_OBIO, paddr, off, prot, 406 flags); 407} 408 409static int 410obio_dmamap_load(bus_dma_tag_t t, bus_dmamap_t map, void *buf, 411 bus_size_t buflen, struct proc *p, int flags) 412{ 413 int error; 414 415 error = _bus_dmamap_load(t, map, buf, buflen, p, flags); 416 if (error == 0) 417 map->dm_segs[0].ds_addr &= DVMA_OBIO_SLAVE_MASK; 418 return error; 419} 420 421