obio.c revision 1.18
1/* $NetBSD: obio.c,v 1.18 2002/09/27 20:36:41 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 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/mon.h> 45#include <machine/pte.h> 46 47#include <sun3/sun3/machdep.h> 48#include <sun3/sun3x/obio.h> 49 50static int obio_match __P((struct device *, struct cfdata *, void *)); 51static void obio_attach __P((struct device *, struct device *, void *)); 52static int obio_print __P((void *, const char *parentname)); 53static int obio_submatch __P((struct device *, struct cfdata *, void *)); 54 55const struct cfattach obio_ca = { 56 sizeof(struct device), obio_match, obio_attach 57}; 58 59static int 60obio_match(parent, cf, aux) 61 struct device *parent; 62 struct cfdata *cf; 63 void *aux; 64{ 65 struct confargs *ca = aux; 66 67 if (ca->ca_bustype != BUS_OBIO) 68 return (0); 69 return(1); 70} 71 72/* 73 * We need control over the order of attachment on OBIO, 74 * so do "direct" style autoconfiguration with addresses 75 * from the list below. OBIO addresses are fixed forever. 76 * 77 * Warning: This whole list is very carefully ordered! 78 * In general, anything not already shown here should 79 * be added at or near the end. 80 */ 81static int obio_alist[] = { 82 83 /* This is used by the Ethernet and SCSI drivers. */ 84 OBIO_IOMMU, 85 86 /* Misc. registers - needed by many things */ 87 OBIO_ENABLEREG, 88 OBIO_BUSERRREG, 89 OBIO_DIAGREG, /* leds.c */ 90 OBIO_IDPROM1, /* idprom.c (3/470) */ 91 OBIO_MEMREG, /* memerr.c */ 92 OBIO_INTERREG, /* intreg.c */ 93 94 /* Zilog UARTs */ 95 OBIO_ZS_KBD_MS, 96 OBIO_ZS_TTY_AB, 97 98 /* eeprom.c */ 99 OBIO_EEPROM, 100 101 /* Note: This must come after OBIO_IDPROM1. */ 102 OBIO_IDPROM2, /* idprom.c (3/80) */ 103 104 /* Note: Must probe for the Intersil first! */ 105 OBIO_CLOCK1, /* clock.c (3/470) */ 106 OBIO_CLOCK2, /* clock.c (3/80) */ 107 108 OBIO_INTEL_ETHER, 109 OBIO_LANCE_ETHER, 110 111 /* Need esp DMA before SCSI. */ 112 OBIO_EMULEX_DMA, /* 3/80 only */ 113 OBIO_EMULEX_SCSI, /* 3/80 only */ 114 115 /* Memory subsystem */ 116 OBIO_PCACHE_TAGS, 117 OBIO_ECCPARREG, 118 OBIO_IOC_TAGS, 119 OBIO_IOC_FLUSH, 120 121 OBIO_FDC, /* floppy disk (3/80) */ 122 OBIO_PRINTER_PORT, /* printer port (3/80) */ 123}; 124#define OBIO_ALIST_LEN (sizeof(obio_alist) / \ 125 sizeof(obio_alist[0])) 126 127static void 128obio_attach(parent, self, aux) 129 struct device *parent; 130 struct device *self; 131 void *aux; 132{ 133 struct confargs *ca = aux; 134 int i; 135 136 printf("\n"); 137 138 /* Configure these in the order listed above. */ 139 for (i = 0; i < OBIO_ALIST_LEN; i++) { 140 /* Our parent set ca->ca_bustype already. */ 141 ca->ca_paddr = obio_alist[i]; 142 /* These are filled-in by obio_submatch. */ 143 ca->ca_intpri = -1; 144 ca->ca_intvec = -1; 145 (void) config_found_sm(self, ca, obio_print, obio_submatch); 146 } 147} 148 149/* 150 * Print out the confargs. The (parent) name is non-NULL 151 * when there was no match found by config_found(). 152 */ 153static int 154obio_print(args, name) 155 void *args; 156 const char *name; 157{ 158 159 /* Be quiet about empty OBIO locations. */ 160 if (name) 161 return(QUIET); 162 163 /* Otherwise do the usual. */ 164 return(bus_print(args, name)); 165} 166 167int 168obio_submatch(parent, cf, aux) 169 struct device *parent; 170 struct cfdata *cf; 171 void *aux; 172{ 173 struct confargs *ca = aux; 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", 185 cf->cf_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 return (config_match(parent, cf, aux)); 207} 208 209 210/*****************************************************************/ 211 212/* 213 * This is our record of "interesting" OBIO mappings that 214 * the PROM has left in the virtual space reserved for it. 215 * Each row of the array holds a virtual address and the 216 * physical address it maps to (if found). 217 */ 218static struct prom_map { 219 paddr_t pa; 220 vaddr_t va; 221} prom_mappings[] = { 222 { OBIO_ENABLEREG, 0 }, /* regs: Sys ENA, Bus ERR, etc. */ 223 { OBIO_ZS_KBD_MS, 0 }, /* Keyboard and Mouse */ 224 { OBIO_ZS_TTY_AB, 0 }, /* Serial Ports */ 225 { OBIO_EEPROM, 0 }, /* EEPROM/IDPROM/clock */ 226}; 227#define PROM_MAP_CNT (sizeof(prom_mappings) / \ 228 sizeof(prom_mappings[0])) 229 230/* 231 * Find a virtual address for a device at physical address 'pa'. 232 * If one is found among the mappings already made by the PROM 233 * at power-up time, use it. Otherwise return 0 as a sign that 234 * a mapping will have to be created. 235 */ 236caddr_t 237obio_find_mapping(paddr_t pa, psize_t sz) 238{ 239 int i; 240 vsize_t off; 241 242 off = pa & PGOFSET; 243 pa -= off; 244 sz += off; 245 246 /* The saved mappings are all one page long. */ 247 if (sz > NBPG) 248 return (caddr_t)0; 249 250 /* Linear search for it. The list is short. */ 251 for (i = 0; i < PROM_MAP_CNT; i++) { 252 if (pa == prom_mappings[i].pa) { 253 return ((caddr_t)(prom_mappings[i].va + off)); 254 } 255 } 256 return (caddr_t)0; 257} 258 259/* 260 * Search the PROM page tables for OBIO mappings that 261 * we would like to borrow. 262 */ 263static void 264save_prom_mappings __P((void)) 265{ 266 int *mon_pte; 267 vaddr_t va; 268 paddr_t pa; 269 int i; 270 271 /* Note: mon_ctbl[0] maps SUN3X_MON_KDB_BASE */ 272 mon_pte = *romVectorPtr->monptaddr; 273 274 for (va = SUN3X_MON_KDB_BASE; va < SUN3X_MONEND; 275 va += NBPG, mon_pte++) 276 { 277 /* Is this a valid mapping to OBIO? */ 278 /* XXX - Some macros would be nice... */ 279 if ((*mon_pte & 0xF0000003) != 0x60000001) 280 continue; 281 282 /* Yes it is. Is this a mapping we want? */ 283 pa = *mon_pte & MMU_SHORT_PTE_BASEADDR; 284 for (i = 0; i < PROM_MAP_CNT; i++) { 285 if (pa != prom_mappings[i].pa) 286 continue; 287 /* Yes, we want it. Save the va? */ 288 if (prom_mappings[i].va == 0) { 289 prom_mappings[i].va = va; 290 } 291 } 292 } 293 294} 295 296/* 297 * These are all the OBIO address that are required early in 298 * the life of the kernel. All are less than one page long. 299 * This function should make any required mappings that we 300 * were not able to find among the PROM monitor's mappings. 301 */ 302static void 303make_required_mappings __P((void)) 304{ 305 int i; 306 307 for (i = 0; i < PROM_MAP_CNT; i++) { 308 if (prom_mappings[i].va == 0) { 309 /* 310 * Actually, the PROM always has all the 311 * "required" mappings we need, (smile) 312 * but this makes sure that is true. 313 */ 314 mon_printf("obio: no mapping for pa=0x%x\n", 315 prom_mappings[i].pa); 316 sunmon_abort(); /* Ancient PROM? */ 317 } 318 } 319} 320 321 322/* 323 * Find mappings for devices that are needed before autoconfiguration. 324 * We first look for and record any useful PROM mappings, then call 325 * the "init" functions for drivers that we need to use before the 326 * normal autoconfiguration calls configure(). Warning: this is 327 * called before pmap_bootstrap, so no allocation allowed! 328 */ 329void 330obio_init() 331{ 332 save_prom_mappings(); 333 make_required_mappings(); 334 335 enable_init(); 336 337 /* 338 * Find the interrupt reg mapping and turn off the 339 * interrupts, otherwise the PROM clock interrupt 340 * would poll the zs and toggle some LEDs... 341 */ 342 intreg_init(); 343} 344