obio.c revision 1.19
1/* $NetBSD: obio.c,v 1.19 2002/10/01 05:32:47 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 55CFATTACH_DECL(obio, sizeof(struct device), 56 obio_match, obio_attach, NULL, NULL) 57 58static int 59obio_match(parent, cf, aux) 60 struct device *parent; 61 struct cfdata *cf; 62 void *aux; 63{ 64 struct confargs *ca = aux; 65 66 if (ca->ca_bustype != BUS_OBIO) 67 return (0); 68 return(1); 69} 70 71/* 72 * We need control over the order of attachment on OBIO, 73 * so do "direct" style autoconfiguration with addresses 74 * from the list below. OBIO addresses are fixed forever. 75 * 76 * Warning: This whole list is very carefully ordered! 77 * In general, anything not already shown here should 78 * be added at or near the end. 79 */ 80static int obio_alist[] = { 81 82 /* This is used by the Ethernet and SCSI drivers. */ 83 OBIO_IOMMU, 84 85 /* Misc. registers - needed by many things */ 86 OBIO_ENABLEREG, 87 OBIO_BUSERRREG, 88 OBIO_DIAGREG, /* leds.c */ 89 OBIO_IDPROM1, /* idprom.c (3/470) */ 90 OBIO_MEMREG, /* memerr.c */ 91 OBIO_INTERREG, /* intreg.c */ 92 93 /* Zilog UARTs */ 94 OBIO_ZS_KBD_MS, 95 OBIO_ZS_TTY_AB, 96 97 /* eeprom.c */ 98 OBIO_EEPROM, 99 100 /* Note: This must come after OBIO_IDPROM1. */ 101 OBIO_IDPROM2, /* idprom.c (3/80) */ 102 103 /* Note: Must probe for the Intersil first! */ 104 OBIO_CLOCK1, /* clock.c (3/470) */ 105 OBIO_CLOCK2, /* clock.c (3/80) */ 106 107 OBIO_INTEL_ETHER, 108 OBIO_LANCE_ETHER, 109 110 /* Need esp DMA before SCSI. */ 111 OBIO_EMULEX_DMA, /* 3/80 only */ 112 OBIO_EMULEX_SCSI, /* 3/80 only */ 113 114 /* Memory subsystem */ 115 OBIO_PCACHE_TAGS, 116 OBIO_ECCPARREG, 117 OBIO_IOC_TAGS, 118 OBIO_IOC_FLUSH, 119 120 OBIO_FDC, /* floppy disk (3/80) */ 121 OBIO_PRINTER_PORT, /* printer port (3/80) */ 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; 173 174 /* 175 * Note that a defaulted address locator can never match 176 * the value of ca->ca_paddr set by the obio_attach loop. 177 * Without this diagnostic, any device with a defaulted 178 * address locator would always be silently unmatched. 179 * Therefore, just disallow default addresses on OBIO. 180 */ 181#ifdef DIAGNOSTIC 182 if (cf->cf_paddr == -1) 183 panic("obio_submatch: invalid address for: %s%d", 184 cf->cf_name, cf->cf_unit); 185#endif 186 187 /* 188 * Note that obio_attach calls config_found_sm() with 189 * this function as the "submatch" and ca->ca_paddr 190 * set to each of the possible OBIO locations, so we 191 * want to reject any unmatched address here. 192 */ 193 if (cf->cf_paddr != ca->ca_paddr) 194 return 0; 195 196 /* 197 * Copy the locators into our confargs for the child. 198 * Note: ca->ca_bustype was set by our parent driver 199 * (mainbus) and ca->ca_paddr was set by obio_attach. 200 */ 201 ca->ca_intpri = cf->cf_intpri; 202 ca->ca_intvec = cf->cf_intvec; 203 204 /* Now call the match function of the potential child. */ 205 return (config_match(parent, cf, aux)); 206} 207 208 209/*****************************************************************/ 210 211/* 212 * This is our record of "interesting" OBIO mappings that 213 * the PROM has left in the virtual space reserved for it. 214 * Each row of the array holds a virtual address and the 215 * physical address it maps to (if found). 216 */ 217static struct prom_map { 218 paddr_t pa; 219 vaddr_t va; 220} prom_mappings[] = { 221 { OBIO_ENABLEREG, 0 }, /* regs: Sys ENA, Bus ERR, etc. */ 222 { OBIO_ZS_KBD_MS, 0 }, /* Keyboard and Mouse */ 223 { OBIO_ZS_TTY_AB, 0 }, /* Serial Ports */ 224 { OBIO_EEPROM, 0 }, /* EEPROM/IDPROM/clock */ 225}; 226#define PROM_MAP_CNT (sizeof(prom_mappings) / \ 227 sizeof(prom_mappings[0])) 228 229/* 230 * Find a virtual address for a device at physical address 'pa'. 231 * If one is found among the mappings already made by the PROM 232 * at power-up time, use it. Otherwise return 0 as a sign that 233 * a mapping will have to be created. 234 */ 235caddr_t 236obio_find_mapping(paddr_t pa, psize_t sz) 237{ 238 int i; 239 vsize_t off; 240 241 off = pa & PGOFSET; 242 pa -= off; 243 sz += off; 244 245 /* The saved mappings are all one page long. */ 246 if (sz > NBPG) 247 return (caddr_t)0; 248 249 /* Linear search for it. The list is short. */ 250 for (i = 0; i < PROM_MAP_CNT; i++) { 251 if (pa == prom_mappings[i].pa) { 252 return ((caddr_t)(prom_mappings[i].va + off)); 253 } 254 } 255 return (caddr_t)0; 256} 257 258/* 259 * Search the PROM page tables for OBIO mappings that 260 * we would like to borrow. 261 */ 262static void 263save_prom_mappings __P((void)) 264{ 265 int *mon_pte; 266 vaddr_t va; 267 paddr_t pa; 268 int i; 269 270 /* Note: mon_ctbl[0] maps SUN3X_MON_KDB_BASE */ 271 mon_pte = *romVectorPtr->monptaddr; 272 273 for (va = SUN3X_MON_KDB_BASE; va < SUN3X_MONEND; 274 va += NBPG, mon_pte++) 275 { 276 /* Is this a valid mapping to OBIO? */ 277 /* XXX - Some macros would be nice... */ 278 if ((*mon_pte & 0xF0000003) != 0x60000001) 279 continue; 280 281 /* Yes it is. Is this a mapping we want? */ 282 pa = *mon_pte & MMU_SHORT_PTE_BASEADDR; 283 for (i = 0; i < PROM_MAP_CNT; i++) { 284 if (pa != prom_mappings[i].pa) 285 continue; 286 /* Yes, we want it. Save the va? */ 287 if (prom_mappings[i].va == 0) { 288 prom_mappings[i].va = va; 289 } 290 } 291 } 292 293} 294 295/* 296 * These are all the OBIO address that are required early in 297 * the life of the kernel. All are less than one page long. 298 * This function should make any required mappings that we 299 * were not able to find among the PROM monitor's mappings. 300 */ 301static void 302make_required_mappings __P((void)) 303{ 304 int i; 305 306 for (i = 0; i < PROM_MAP_CNT; i++) { 307 if (prom_mappings[i].va == 0) { 308 /* 309 * Actually, the PROM always has all the 310 * "required" mappings we need, (smile) 311 * but this makes sure that is true. 312 */ 313 mon_printf("obio: no mapping for pa=0x%x\n", 314 prom_mappings[i].pa); 315 sunmon_abort(); /* Ancient PROM? */ 316 } 317 } 318} 319 320 321/* 322 * Find mappings for devices that are needed before autoconfiguration. 323 * We first look for and record any useful PROM mappings, then call 324 * the "init" functions for drivers that we need to use before the 325 * normal autoconfiguration calls configure(). Warning: this is 326 * called before pmap_bootstrap, so no allocation allowed! 327 */ 328void 329obio_init() 330{ 331 save_prom_mappings(); 332 make_required_mappings(); 333 334 enable_init(); 335 336 /* 337 * Find the interrupt reg mapping and turn off the 338 * interrupts, otherwise the PROM clock interrupt 339 * would poll the zs and toggle some LEDs... 340 */ 341 intreg_init(); 342} 343