obio.c revision 1.7
1/* $NetBSD: obio.c,v 1.7 1997/10/04 19:48:36 gwr 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 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39#include <sys/param.h> 40#include <sys/systm.h> 41#include <sys/device.h> 42 43#include <machine/autoconf.h> 44#include <machine/machdep.h> 45#include <machine/mon.h> 46#include <machine/obio.h> 47#include <machine/pte.h> 48 49short *enable_reg; 50 51static int obio_match __P((struct device *, struct cfdata *, void *)); 52static void obio_attach __P((struct device *, struct device *, void *)); 53static int obio_print __P((void *, const char *parentname)); 54static int obio_submatch __P((struct device *, struct cfdata *, void *)); 55 56struct cfattach obio_ca = { 57 sizeof(struct device), obio_match, obio_attach 58}; 59 60struct cfdriver obio_cd = { 61 NULL, "obio", DV_DULL 62}; 63 64static int 65obio_match(parent, cf, aux) 66 struct device *parent; 67 struct cfdata *cf; 68 void *aux; 69{ 70 struct confargs *ca = aux; 71 72 if (ca->ca_bustype != BUS_OBIO) 73 return (0); 74 return(1); 75} 76 77/* 78 * We need some control over the order of attachment on OBIO, 79 * and all OBIO device addresses are known and fixed foerver. 80 * Therefore, this uses a list of addresses to attach. 81 * XXX - Any other way to control search/attach order? 82 * 83 * Warning: This whole list is very carefully ordered! 84 * In general, anything not already shown here should 85 * be added at or near the end. 86 */ 87static int obio_alist[] = { 88 89 /* Misc. registers - needed by many things */ 90 OBIO_ENABLEREG, 91 OBIO_BUSERRREG, 92 OBIO_DIAGREG, /* leds.c */ 93 OBIO_IDPROM1, /* idprom.c (3/470) */ 94 OBIO_MEMREG, /* memerr.c */ 95 OBIO_INTERREG, /* intreg.c */ 96 97 /* Zilog UARTs */ 98 OBIO_ZS_KBD_MS, 99 OBIO_ZS_TTY_AB, 100 101 /* eeprom.c */ 102 OBIO_EEPROM, 103 104 /* Note: This must come after OBIO_IDPROM1. */ 105 OBIO_IDPROM2, /* idprom.c (3/80) */ 106 107 /* Note: Must probe for the Intersil first! */ 108 OBIO_CLOCK1, /* clock.c (3/470) */ 109 OBIO_CLOCK2, /* clock.c (3/80) */ 110 111 /* This is used by the Ethernet and SCSI drivers. */ 112 OBIO_IOMMU, 113 114 OBIO_INTEL_ETHER, 115 OBIO_LANCE_ETHER, 116 117 OBIO_EMULEX_SCSI, /* 3/80 only */ 118 119 /* ...todo... */ 120 OBIO_FDC, 121 OBIO_PRINTER_PORT, 122}; 123#define OBIO_ALIST_LEN (sizeof(obio_alist) / \ 124 sizeof(obio_alist[0])) 125 126static void 127obio_attach(parent, self, aux) 128 struct device *parent; 129 struct device *self; 130 void *aux; 131{ 132 struct confargs *ca = aux; 133 int i; 134 135 printf("\n"); 136 137 /* Configure these in the order listed above. */ 138 for (i = 0; i < OBIO_ALIST_LEN; i++) { 139 /* Our parent set ca->ca_bustype already. */ 140 ca->ca_paddr = obio_alist[i]; 141 /* These are filled-in by obio_submatch. */ 142 ca->ca_intpri = -1; 143 ca->ca_intvec = -1; 144 (void) config_found_sm(self, ca, obio_print, obio_submatch); 145 } 146} 147 148/* 149 * Print out the confargs. The (parent) name is non-NULL 150 * when there was no match found by config_found(). 151 */ 152static int 153obio_print(args, name) 154 void *args; 155 const char *name; 156{ 157 158 /* Be quiet about empty OBIO locations. */ 159 if (name) 160 return(QUIET); 161 162 /* Otherwise do the usual. */ 163 return(bus_print(args, name)); 164} 165 166int 167obio_submatch(parent, cf, aux) 168 struct device *parent; 169 struct cfdata *cf; 170 void *aux; 171{ 172 struct confargs *ca = aux; 173 cfmatch_t submatch; 174 175 /* 176 * Note that a defaulted address locator can never match 177 * the value of ca->ca_paddr set by the obio_attach loop. 178 * Without this diagnostic, any device with a defaulted 179 * address locator would always be silently unmatched. 180 * Therefore, just disallow default addresses on OBIO. 181 */ 182#ifdef DIAGNOSTIC 183 if (cf->cf_paddr == -1) 184 panic("obio_submatch: invalid address for: %s%d\n", 185 cf->cf_driver->cd_name, cf->cf_unit); 186#endif 187 188 /* 189 * Note that obio_attach calls config_found_sm() with 190 * this function as the "submatch" and ca->ca_paddr 191 * set to each of the possible OBIO locations, so we 192 * want to reject any unmatched address here. 193 */ 194 if (cf->cf_paddr != ca->ca_paddr) 195 return 0; 196 197 /* 198 * Copy the locators into our confargs for the child. 199 * Note: ca->ca_bustype was set by our parent driver 200 * (mainbus) and ca->ca_paddr was set by obio_attach. 201 */ 202 ca->ca_intpri = cf->cf_intpri; 203 ca->ca_intvec = cf->cf_intvec; 204 205 /* Now call the match function of the potential child. */ 206 submatch = cf->cf_attach->ca_match; 207 if (submatch == NULL) 208 panic("obio_submatch: no match function for: %s\n", 209 cf->cf_driver->cd_name); 210 211 return ((*submatch)(parent, cf, aux)); 212} 213 214 215/*****************************************************************/ 216 217/* 218 * This is our record of "interesting" OBIO mappings that 219 * the PROM has left in the virtual space reserved for it. 220 * Each non-null array element holds the virtual address 221 * of an OBIO mapping where the OBIO address mapped is: 222 * (array_index * SAVE_INCR) 223 * and the length of the mapping is one page. 224 */ 225static struct prom_map { 226 vm_offset_t pa, va; 227} prom_mappings[] = { 228 { OBIO_ENABLEREG, 0 }, /* regs: Sys ENA, Bus ERR, etc. */ 229 { OBIO_ZS_KBD_MS, 0 }, /* Keyboard and Mouse */ 230 { OBIO_ZS_TTY_AB, 0 }, /* Serial Ports */ 231 { OBIO_EEPROM, 0 }, /* EEPROM/IDPROM/clock */ 232}; 233#define PROM_MAP_CNT (sizeof(prom_mappings) / \ 234 sizeof(prom_mappings[0])) 235 236/* 237 * Find a virtual address for a device at physical address 'pa'. 238 * If one is found among the mappings already made by the PROM 239 * at power-up time, use it. Otherwise return 0 as a sign that 240 * a mapping will have to be created. 241 */ 242caddr_t 243obio_find_mapping(int pa, int size) 244{ 245 int i, off; 246 247 if (size >= NBPG) 248 return (caddr_t)0; 249 250 off = pa & PGOFSET; 251 pa -= off; 252 253 for (i = 0; i < PROM_MAP_CNT; i++) { 254 if (pa == prom_mappings[i].pa) { 255 return ((caddr_t)(prom_mappings[i].va + off)); 256 } 257 } 258 return (caddr_t)0; 259} 260 261/* 262 * Search the PROM page tables for OBIO mappings that 263 * we would like to borrow. 264 */ 265static void 266save_prom_mappings __P((void)) 267{ 268 int *mon_pte; 269 vm_offset_t va, pa; 270 int i; 271 272 /* Note: mon_ctbl[0] maps MON_KDB_START */ 273 mon_pte = *romVectorPtr->monptaddr; 274 275 for (va = MON_KDB_START; va < MONEND; 276 va += NBPG, mon_pte++) 277 { 278 /* Is this a valid mapping to OBIO? */ 279 /* XXX - Some macros would be nice... */ 280 if ((*mon_pte & 0xF0000003) != 0x60000001) 281 continue; 282 283 /* Yes it is. Is this a mapping we want? */ 284 pa = *mon_pte & MMU_SHORT_PTE_BASEADDR; 285 for (i = 0; i < PROM_MAP_CNT; i++) { 286 if (pa != prom_mappings[i].pa) 287 continue; 288 /* Yes, we want it. Save the va? */ 289 if (prom_mappings[i].va == 0) { 290 prom_mappings[i].va = va; 291 } 292 } 293 } 294 295} 296 297/* 298 * These are all the OBIO address that are required early in 299 * the life of the kernel. All are less than one page long. 300 * This function should make any required mappings that we 301 * were not able to find among the PROM monitor's mappings. 302 */ 303static void 304make_required_mappings __P((void)) 305{ 306 int i; 307 308 for (i = 0; i < PROM_MAP_CNT; i++) { 309 if (prom_mappings[i].va == 0) { 310 /* 311 * Actually, the PROM always has all the 312 * "required" mappings we need, (smile) 313 * but this makes sure that is true. 314 */ 315 mon_printf("obio: no mapping for pa=0x%x\n", 316 prom_mappings[i].pa); 317 sunmon_abort(); /* Ancient PROM? */ 318 } 319 } 320} 321 322 323/* 324 * Find mappings for devices that are needed before autoconfiguration. 325 * We first look for and record any useful PROM mappings, then call 326 * the "init" functions for drivers that we need to use before the 327 * normal autoconfiguration calls configure(). Warning: this is 328 * called before pmap_bootstrap, so no allocation allowed! 329 */ 330void 331obio_init() 332{ 333 save_prom_mappings(); 334 make_required_mappings(); 335 336 enable_reg = (short*) obio_find_mapping(OBIO_ENABLEREG, 2); 337 338 /* 339 * Find the interrupt reg mapping and turn off the 340 * interrupts, otherwise the PROM clock interrupt 341 * would poll the zs and toggle some LEDs... 342 */ 343 intreg_init(); 344 345 /* Turn on the LEDs so we know power is on. */ 346 leds_init(); 347 348 /* Make the zs driver ready for console duty. */ 349 zs_init(); 350} 351 352/* 353 * This function is used by some OBIO drivers to conserve 354 * kernel virtual space by sharing mappings made by the 355 * PROM monitor. If we could not find any mapping made by 356 * the PROM monitor, then make our own as usual. 357 */ 358caddr_t 359obio_mapin(obio_addr, obio_size) 360 int obio_addr, obio_size; 361{ 362 caddr_t cp; 363 364 cp = obio_find_mapping((vm_offset_t)obio_addr, obio_size); 365 if (cp) 366 return (cp); 367 368 cp = bus_mapin(BUS_OBIO, obio_addr, obio_size); 369 return (cp); 370} 371