obio.c revision 1.2
1/* $NetBSD: obio.c,v 1.2 1997/01/25 21:48:49 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/pte.h> 45#include <machine/mon.h> 46#include <machine/obio.h> 47 48#include <sun3/sun3/sunmon.h> 49 50short *enable_reg; 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 57struct cfattach obio_ca = { 58 sizeof(struct device), obio_match, obio_attach 59}; 60 61struct cfdriver obio_cd = { 62 NULL, "obio", DV_DULL 63}; 64 65static int 66obio_match(parent, cf, aux) 67 struct device *parent; 68 struct cfdata *cf; 69 void *aux; 70{ 71 struct confargs *ca = aux; 72 73 if (ca->ca_bustype != BUS_OBIO) 74 return (0); 75 return(1); 76} 77 78/* 79 * We need some control over the order of attachment on OBIO, 80 * and all OBIO device addresses are known and fixed foerver. 81 * Therefore, this uses a list of addresses to attach. 82 * XXX - Any other way to control search/attach order? 83 */ 84static int obio_alist[] = { 85 OBIO_ZS_KBD_MS, 86 OBIO_ZS_TTY_AB, 87 88 OBIO_EEPROM, /* the next two are part of the eeprom */ 89 OBIO_IDPROM2, /* 3/80 only */ 90 OBIO_CLOCK2, /* 3/80 only */ 91 92 OBIO_CLOCK1, /* 3/470 only */ 93 94 /* These are all in the same page - could be just one driver... */ 95 OBIO_ENABLEREG, 96 OBIO_BUSERRREG, 97 OBIO_DIAGREG, 98 OBIO_IDPROM1, 99 OBIO_MEMREG, 100 OBIO_INTERREG, 101 102 OBIO_P4_REG, 103 OBIO_IOMMU, 104 105 OBIO_INTEL_ETHER, 106 OBIO_LANCE_ETHER, 107 108 /* ...todo... */ 109 OBIO_FDC, 110 OBIO_PRINTER_PORT, 111}; 112#define OBIO_ALIST_LEN (sizeof(obio_alist) / \ 113 sizeof(obio_alist[0])) 114 115static void 116obio_attach(parent, self, aux) 117 struct device *parent; 118 struct device *self; 119 void *aux; 120{ 121 struct confargs *ca = aux; 122 int i; 123 124 printf("\n"); 125 126 /* Configure these in order of address. */ 127 for (i = 0; i < OBIO_ALIST_LEN; i++) { 128 /* We know ca_bustype == BUS_OBIO */ 129 ca->ca_paddr = obio_alist[i]; 130 ca->ca_intpri = -1; 131 ca->ca_intvec = -1; 132 (void) config_found_sm(self, ca, obio_print, obio_submatch); 133 } 134} 135 136/* 137 * Print out the confargs. The (parent) name is non-NULL 138 * when there was no match found by config_found(). 139 */ 140static int 141obio_print(args, name) 142 void *args; 143 const char *name; 144{ 145 struct confargs *ca = args; 146 147 /* Be quiet about empty OBIO locations. */ 148 if (name) 149 return(QUIET); 150 151 if (ca->ca_paddr != -1) 152 printf(" addr 0x%x", ca->ca_paddr); 153 if (ca->ca_intpri != -1) 154 printf(" level %d", ca->ca_intpri); 155 156 return(UNCONF); 157} 158 159int 160obio_submatch(parent, cf, aux) 161 struct device *parent; 162 struct cfdata *cf; 163 void *aux; 164{ 165 struct confargs *ca = aux; 166 cfmatch_t submatch; 167 168 /* 169 * Default addresses are mostly useless for OBIO. 170 * The address assignments are fixed for all time, 171 * so our config files might as well reflect that. 172 */ 173#ifdef DIAGNOSTIC 174 if (cf->cf_paddr == -1) 175 panic("obio_submatch: invalid address for: %s%d\n", 176 cf->cf_driver->cd_name, cf->cf_unit); 177#endif 178 179 /* This enforces exact address match. */ 180 if (cf->cf_paddr != ca->ca_paddr) 181 return 0; 182 183 /* Now call the match function of the potential child. */ 184 submatch = cf->cf_attach->ca_match; 185 if (submatch == NULL) 186 panic("obio_submatch: no match function for: %s\n", 187 cf->cf_driver->cd_name); 188 189 return ((*submatch)(parent, cf, aux)); 190} 191 192 193/*****************************************************************/ 194 195/* 196 * This is our record of "interesting" OBIO mappings that 197 * the PROM has left in the virtual space reserved for it. 198 * Each non-null array element holds the virtual address 199 * of an OBIO mapping where the OBIO address mapped is: 200 * (array_index * SAVE_INCR) 201 * and the length of the mapping is one page. 202 */ 203static struct prom_map { 204 vm_offset_t pa, va; 205} prom_mappings[] = { 206 { OBIO_ZS_KBD_MS, 0 }, /* Keyboard and Mouse */ 207 { OBIO_ZS_TTY_AB, 0 }, /* Serial Ports */ 208 { OBIO_EEPROM, 0 }, /* EEPROM/IDPROM/clock */ 209 { OBIO_ENABLEREG, 0 }, /* regs: Sys ENA, Bus ERR, etc. */ 210}; 211#define PROM_MAP_CNT (sizeof(prom_mappings) / \ 212 sizeof(prom_mappings[0])) 213 214/* 215 * Find a virtual address for a device at physical address 'pa'. 216 * If one is found among the mappings already made by the PROM 217 * at power-up time, use it. Otherwise return 0 as a sign that 218 * a mapping will have to be created. 219 */ 220caddr_t 221obio_find_mapping(int pa, int size) 222{ 223 int i, off; 224 225 if (size >= NBPG) 226 return (caddr_t)0; 227 228 off = pa & PGOFSET; 229 pa -= off; 230 231 for (i = 0; i < PROM_MAP_CNT; i++) { 232 if (pa == prom_mappings[i].pa) { 233 return ((caddr_t)(prom_mappings[i].va + off)); 234 } 235 } 236 return (caddr_t)0; 237} 238 239/* 240 * Search the PROM page tables for OBIO mappings that 241 * we would like to borrow. 242 */ 243static void 244save_prom_mappings __P((void)) 245{ 246 int *mon_pte; 247 vm_offset_t va, pa; 248 int i; 249 250 /* Note: mon_ctbl[0] maps MON_KDB_START */ 251 mon_pte = *romVectorPtr->monptaddr; 252 253 for (va = MON_KDB_START; va < MONEND; 254 va += NBPG, mon_pte++) 255 { 256 /* Is this a valid mapping to OBIO? */ 257 /* XXX - Some macros would be nice... */ 258 if ((*mon_pte & 0xF0000003) != 0x60000001) 259 continue; 260 261 /* Yes it is. Is this a mapping we want? */ 262 pa = *mon_pte & MMU_SHORT_PTE_BASEADDR; 263 for (i = 0; i < PROM_MAP_CNT; i++) { 264 if (pa != prom_mappings[i].pa) 265 continue; 266 /* Yes, we want it. Save the va? */ 267 if (prom_mappings[i].va == 0) { 268 prom_mappings[i].va = va; 269 } 270 } 271 } 272 273} 274 275/* 276 * These are all the OBIO address that are required early in 277 * the life of the kernel. All are less than one page long. 278 * This function should make any required mappings that we 279 * were not able to find among the PROM monitor's mappings. 280 */ 281static void 282make_required_mappings __P((void)) 283{ 284 int i; 285 286 for (i = 0; i < PROM_MAP_CNT; i++) { 287 if (prom_mappings[i].va == 0) { 288 /* 289 * Actually, the PROM always has all the 290 * "required" mappings we need, (smile) 291 * but this makes sure that is true. 292 */ 293 mon_printf("obio: no mapping for pa=0x%x\n", 294 prom_mappings[i].pa); 295 sunmon_abort(); /* Ancient PROM? */ 296 } 297 } 298} 299 300 301/* 302 * Find mappings for devices that are needed before autoconfiguration. 303 * We first look for and record any useful PROM mappings, then call 304 * the "init" functions for drivers that we need to use before the 305 * normal autoconfiguration calls configure(). Warning: this is 306 * called before pmap_bootstrap, so no allocation allowed! 307 */ 308void 309obio_init() 310{ 311 save_prom_mappings(); 312 make_required_mappings(); 313 314 /* Init drivers that use the required OBIO mappings. */ 315 idprom_init(); 316 eeprom_init(); 317 zs_init(); 318 319 enable_reg = (short*) obio_find_mapping(OBIO_ENABLEREG, 2); 320 intreg_init(); 321 clock_init(); 322} 323 324caddr_t 325obio_alloc(obio_addr, obio_size) 326 int obio_addr, obio_size; 327{ 328 caddr_t cp; 329 330 cp = obio_find_mapping((vm_offset_t)obio_addr, obio_size); 331 if (cp) return (cp); 332 333 cp = bus_mapin(BUS_OBIO, obio_addr, obio_size); 334 return (cp); 335} 336