obio.c revision 1.21
1/* $NetBSD: obio.c,v 1.21 2003/04/01 15:28:41 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 <uvm/uvm_extern.h> 44 45#include <machine/autoconf.h> 46#include <machine/mon.h> 47#include <machine/pte.h> 48 49#include <sun3/sun3/machdep.h> 50#include <sun3/sun3x/obio.h> 51 52static int obio_match __P((struct device *, struct cfdata *, void *)); 53static void obio_attach __P((struct device *, struct device *, void *)); 54static int obio_print __P((void *, const char *parentname)); 55static int obio_submatch __P((struct device *, struct cfdata *, void *)); 56 57CFATTACH_DECL(obio, sizeof(struct device), 58 obio_match, obio_attach, NULL, NULL); 59 60static int 61obio_match(parent, cf, aux) 62 struct device *parent; 63 struct cfdata *cf; 64 void *aux; 65{ 66 struct confargs *ca = aux; 67 68 if (ca->ca_bustype != BUS_OBIO) 69 return (0); 70 return(1); 71} 72 73/* 74 * We need control over the order of attachment on OBIO, 75 * so do "direct" style autoconfiguration with addresses 76 * from the list below. OBIO addresses are fixed forever. 77 * 78 * Warning: This whole list is very carefully ordered! 79 * In general, anything not already shown here should 80 * be added at or near the end. 81 */ 82static int obio_alist[] = { 83 84 /* This is used by the Ethernet and SCSI drivers. */ 85 OBIO_IOMMU, 86 87 /* Misc. registers - needed by many things */ 88 OBIO_ENABLEREG, 89 OBIO_BUSERRREG, 90 OBIO_DIAGREG, /* leds.c */ 91 OBIO_IDPROM1, /* idprom.c (3/470) */ 92 OBIO_MEMREG, /* memerr.c */ 93 OBIO_INTERREG, /* intreg.c */ 94 95 /* Zilog UARTs */ 96 OBIO_ZS_KBD_MS, 97 OBIO_ZS_TTY_AB, 98 99 /* eeprom.c */ 100 OBIO_EEPROM, 101 102 /* Note: This must come after OBIO_IDPROM1. */ 103 OBIO_IDPROM2, /* idprom.c (3/80) */ 104 105 /* Note: Must probe for the Intersil first! */ 106 OBIO_CLOCK1, /* clock.c (3/470) */ 107 OBIO_CLOCK2, /* clock.c (3/80) */ 108 109 OBIO_INTEL_ETHER, 110 OBIO_LANCE_ETHER, 111 112 /* Need esp DMA before SCSI. */ 113 OBIO_EMULEX_DMA, /* 3/80 only */ 114 OBIO_EMULEX_SCSI, /* 3/80 only */ 115 116 /* Memory subsystem */ 117 OBIO_PCACHE_TAGS, 118 OBIO_ECCPARREG, 119 OBIO_IOC_TAGS, 120 OBIO_IOC_FLUSH, 121 122 OBIO_FDC, /* floppy disk (3/80) */ 123 OBIO_PRINTER_PORT, /* printer port (3/80) */ 124}; 125#define OBIO_ALIST_LEN (sizeof(obio_alist) / \ 126 sizeof(obio_alist[0])) 127 128static void 129obio_attach(parent, self, aux) 130 struct device *parent; 131 struct device *self; 132 void *aux; 133{ 134 struct confargs *ca = aux; 135 int i; 136 137 printf("\n"); 138 139 /* Configure these in the order listed above. */ 140 for (i = 0; i < OBIO_ALIST_LEN; i++) { 141 /* Our parent set ca->ca_bustype already. */ 142 ca->ca_paddr = obio_alist[i]; 143 /* These are filled-in by obio_submatch. */ 144 ca->ca_intpri = -1; 145 ca->ca_intvec = -1; 146 (void) config_found_sm(self, ca, obio_print, obio_submatch); 147 } 148} 149 150/* 151 * Print out the confargs. The (parent) name is non-NULL 152 * when there was no match found by config_found(). 153 */ 154static int 155obio_print(args, name) 156 void *args; 157 const char *name; 158{ 159 160 /* Be quiet about empty OBIO locations. */ 161 if (name) 162 return(QUIET); 163 164 /* Otherwise do the usual. */ 165 return(bus_print(args, name)); 166} 167 168int 169obio_submatch(parent, cf, aux) 170 struct device *parent; 171 struct cfdata *cf; 172 void *aux; 173{ 174 struct confargs *ca = aux; 175 176 /* 177 * Note that a defaulted address locator can never match 178 * the value of ca->ca_paddr set by the obio_attach loop. 179 * Without this diagnostic, any device with a defaulted 180 * address locator would always be silently unmatched. 181 * Therefore, just disallow default addresses on OBIO. 182 */ 183#ifdef DIAGNOSTIC 184 if (cf->cf_paddr == -1) 185 panic("obio_submatch: invalid address for: %s%d", 186 cf->cf_name, cf->cf_unit); 187#endif 188 189 /* 190 * Note that obio_attach calls config_found_sm() with 191 * this function as the "submatch" and ca->ca_paddr 192 * set to each of the possible OBIO locations, so we 193 * want to reject any unmatched address here. 194 */ 195 if (cf->cf_paddr != ca->ca_paddr) 196 return 0; 197 198 /* 199 * Copy the locators into our confargs for the child. 200 * Note: ca->ca_bustype was set by our parent driver 201 * (mainbus) and ca->ca_paddr was set by obio_attach. 202 */ 203 ca->ca_intpri = cf->cf_intpri; 204 ca->ca_intvec = cf->cf_intvec; 205 206 /* Now call the match function of the potential child. */ 207 return (config_match(parent, cf, aux)); 208} 209 210 211/*****************************************************************/ 212 213/* 214 * This is our record of "interesting" OBIO mappings that 215 * the PROM has left in the virtual space reserved for it. 216 * Each row of the array holds a virtual address and the 217 * physical address it maps to (if found). 218 */ 219static struct prom_map { 220 paddr_t pa; 221 vaddr_t va; 222} prom_mappings[] = { 223 { OBIO_ENABLEREG, 0 }, /* regs: Sys ENA, Bus ERR, etc. */ 224 { OBIO_ZS_KBD_MS, 0 }, /* Keyboard and Mouse */ 225 { OBIO_ZS_TTY_AB, 0 }, /* Serial Ports */ 226 { OBIO_EEPROM, 0 }, /* EEPROM/IDPROM/clock */ 227}; 228#define PROM_MAP_CNT (sizeof(prom_mappings) / \ 229 sizeof(prom_mappings[0])) 230 231/* 232 * Find a virtual address for a device at physical address 'pa'. 233 * If one is found among the mappings already made by the PROM 234 * at power-up time, use it. Otherwise return 0 as a sign that 235 * a mapping will have to be created. 236 */ 237caddr_t 238obio_find_mapping(paddr_t pa, psize_t sz) 239{ 240 int i; 241 vsize_t off; 242 243 off = pa & PGOFSET; 244 pa -= off; 245 sz += off; 246 247 /* The saved mappings are all one page long. */ 248 if (sz > PAGE_SIZE) 249 return (caddr_t)0; 250 251 /* Linear search for it. The list is short. */ 252 for (i = 0; i < PROM_MAP_CNT; i++) { 253 if (pa == prom_mappings[i].pa) { 254 return ((caddr_t)(prom_mappings[i].va + off)); 255 } 256 } 257 return (caddr_t)0; 258} 259 260/* 261 * Search the PROM page tables for OBIO mappings that 262 * we would like to borrow. 263 */ 264static void 265save_prom_mappings __P((void)) 266{ 267 int *mon_pte; 268 vaddr_t va; 269 paddr_t pa; 270 int i; 271 272 /* Note: mon_ctbl[0] maps SUN3X_MON_KDB_BASE */ 273 mon_pte = *romVectorPtr->monptaddr; 274 275 for (va = SUN3X_MON_KDB_BASE; va < SUN3X_MONEND; 276 va += PAGE_SIZE, 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_init(); 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