obio.c revision 1.22
1/* $NetBSD: obio.c,v 1.22 2003/07/15 03:36:20 lukem 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/cdefs.h> 40__KERNEL_RCSID(0, "$NetBSD: obio.c,v 1.22 2003/07/15 03:36:20 lukem Exp $"); 41 42#include <sys/param.h> 43#include <sys/systm.h> 44#include <sys/device.h> 45 46#include <uvm/uvm_extern.h> 47 48#include <machine/autoconf.h> 49#include <machine/mon.h> 50#include <machine/pte.h> 51 52#include <sun3/sun3/machdep.h> 53#include <sun3/sun3x/obio.h> 54 55static int obio_match __P((struct device *, struct cfdata *, void *)); 56static void obio_attach __P((struct device *, struct device *, void *)); 57static int obio_print __P((void *, const char *parentname)); 58static int obio_submatch __P((struct device *, struct cfdata *, void *)); 59 60CFATTACH_DECL(obio, sizeof(struct device), 61 obio_match, obio_attach, NULL, NULL); 62 63static int 64obio_match(parent, cf, aux) 65 struct device *parent; 66 struct cfdata *cf; 67 void *aux; 68{ 69 struct confargs *ca = aux; 70 71 if (ca->ca_bustype != BUS_OBIO) 72 return (0); 73 return(1); 74} 75 76/* 77 * We need control over the order of attachment on OBIO, 78 * so do "direct" style autoconfiguration with addresses 79 * from the list below. OBIO addresses are fixed forever. 80 * 81 * Warning: This whole list is very carefully ordered! 82 * In general, anything not already shown here should 83 * be added at or near the end. 84 */ 85static int obio_alist[] = { 86 87 /* This is used by the Ethernet and SCSI drivers. */ 88 OBIO_IOMMU, 89 90 /* Misc. registers - needed by many things */ 91 OBIO_ENABLEREG, 92 OBIO_BUSERRREG, 93 OBIO_DIAGREG, /* leds.c */ 94 OBIO_IDPROM1, /* idprom.c (3/470) */ 95 OBIO_MEMREG, /* memerr.c */ 96 OBIO_INTERREG, /* intreg.c */ 97 98 /* Zilog UARTs */ 99 OBIO_ZS_KBD_MS, 100 OBIO_ZS_TTY_AB, 101 102 /* eeprom.c */ 103 OBIO_EEPROM, 104 105 /* Note: This must come after OBIO_IDPROM1. */ 106 OBIO_IDPROM2, /* idprom.c (3/80) */ 107 108 /* Note: Must probe for the Intersil first! */ 109 OBIO_CLOCK1, /* clock.c (3/470) */ 110 OBIO_CLOCK2, /* clock.c (3/80) */ 111 112 OBIO_INTEL_ETHER, 113 OBIO_LANCE_ETHER, 114 115 /* Need esp DMA before SCSI. */ 116 OBIO_EMULEX_DMA, /* 3/80 only */ 117 OBIO_EMULEX_SCSI, /* 3/80 only */ 118 119 /* Memory subsystem */ 120 OBIO_PCACHE_TAGS, 121 OBIO_ECCPARREG, 122 OBIO_IOC_TAGS, 123 OBIO_IOC_FLUSH, 124 125 OBIO_FDC, /* floppy disk (3/80) */ 126 OBIO_PRINTER_PORT, /* printer port (3/80) */ 127}; 128#define OBIO_ALIST_LEN (sizeof(obio_alist) / \ 129 sizeof(obio_alist[0])) 130 131static void 132obio_attach(parent, self, aux) 133 struct device *parent; 134 struct device *self; 135 void *aux; 136{ 137 struct confargs *ca = aux; 138 int i; 139 140 printf("\n"); 141 142 /* Configure these in the order listed above. */ 143 for (i = 0; i < OBIO_ALIST_LEN; i++) { 144 /* Our parent set ca->ca_bustype already. */ 145 ca->ca_paddr = obio_alist[i]; 146 /* These are filled-in by obio_submatch. */ 147 ca->ca_intpri = -1; 148 ca->ca_intvec = -1; 149 (void) config_found_sm(self, ca, obio_print, obio_submatch); 150 } 151} 152 153/* 154 * Print out the confargs. The (parent) name is non-NULL 155 * when there was no match found by config_found(). 156 */ 157static int 158obio_print(args, name) 159 void *args; 160 const char *name; 161{ 162 163 /* Be quiet about empty OBIO locations. */ 164 if (name) 165 return(QUIET); 166 167 /* Otherwise do the usual. */ 168 return(bus_print(args, name)); 169} 170 171int 172obio_submatch(parent, cf, aux) 173 struct device *parent; 174 struct cfdata *cf; 175 void *aux; 176{ 177 struct confargs *ca = aux; 178 179 /* 180 * Note that a defaulted address locator can never match 181 * the value of ca->ca_paddr set by the obio_attach loop. 182 * Without this diagnostic, any device with a defaulted 183 * address locator would always be silently unmatched. 184 * Therefore, just disallow default addresses on OBIO. 185 */ 186#ifdef DIAGNOSTIC 187 if (cf->cf_paddr == -1) 188 panic("obio_submatch: invalid address for: %s%d", 189 cf->cf_name, cf->cf_unit); 190#endif 191 192 /* 193 * Note that obio_attach calls config_found_sm() with 194 * this function as the "submatch" and ca->ca_paddr 195 * set to each of the possible OBIO locations, so we 196 * want to reject any unmatched address here. 197 */ 198 if (cf->cf_paddr != ca->ca_paddr) 199 return 0; 200 201 /* 202 * Copy the locators into our confargs for the child. 203 * Note: ca->ca_bustype was set by our parent driver 204 * (mainbus) and ca->ca_paddr was set by obio_attach. 205 */ 206 ca->ca_intpri = cf->cf_intpri; 207 ca->ca_intvec = cf->cf_intvec; 208 209 /* Now call the match function of the potential child. */ 210 return (config_match(parent, cf, aux)); 211} 212 213 214/*****************************************************************/ 215 216/* 217 * This is our record of "interesting" OBIO mappings that 218 * the PROM has left in the virtual space reserved for it. 219 * Each row of the array holds a virtual address and the 220 * physical address it maps to (if found). 221 */ 222static struct prom_map { 223 paddr_t pa; 224 vaddr_t va; 225} prom_mappings[] = { 226 { OBIO_ENABLEREG, 0 }, /* regs: Sys ENA, Bus ERR, etc. */ 227 { OBIO_ZS_KBD_MS, 0 }, /* Keyboard and Mouse */ 228 { OBIO_ZS_TTY_AB, 0 }, /* Serial Ports */ 229 { OBIO_EEPROM, 0 }, /* EEPROM/IDPROM/clock */ 230}; 231#define PROM_MAP_CNT (sizeof(prom_mappings) / \ 232 sizeof(prom_mappings[0])) 233 234/* 235 * Find a virtual address for a device at physical address 'pa'. 236 * If one is found among the mappings already made by the PROM 237 * at power-up time, use it. Otherwise return 0 as a sign that 238 * a mapping will have to be created. 239 */ 240caddr_t 241obio_find_mapping(paddr_t pa, psize_t sz) 242{ 243 int i; 244 vsize_t off; 245 246 off = pa & PGOFSET; 247 pa -= off; 248 sz += off; 249 250 /* The saved mappings are all one page long. */ 251 if (sz > PAGE_SIZE) 252 return (caddr_t)0; 253 254 /* Linear search for it. The list is short. */ 255 for (i = 0; i < PROM_MAP_CNT; i++) { 256 if (pa == prom_mappings[i].pa) { 257 return ((caddr_t)(prom_mappings[i].va + off)); 258 } 259 } 260 return (caddr_t)0; 261} 262 263/* 264 * Search the PROM page tables for OBIO mappings that 265 * we would like to borrow. 266 */ 267static void 268save_prom_mappings __P((void)) 269{ 270 int *mon_pte; 271 vaddr_t va; 272 paddr_t pa; 273 int i; 274 275 /* Note: mon_ctbl[0] maps SUN3X_MON_KDB_BASE */ 276 mon_pte = *romVectorPtr->monptaddr; 277 278 for (va = SUN3X_MON_KDB_BASE; va < SUN3X_MONEND; 279 va += PAGE_SIZE, mon_pte++) 280 { 281 /* Is this a valid mapping to OBIO? */ 282 /* XXX - Some macros would be nice... */ 283 if ((*mon_pte & 0xF0000003) != 0x60000001) 284 continue; 285 286 /* Yes it is. Is this a mapping we want? */ 287 pa = *mon_pte & MMU_SHORT_PTE_BASEADDR; 288 for (i = 0; i < PROM_MAP_CNT; i++) { 289 if (pa != prom_mappings[i].pa) 290 continue; 291 /* Yes, we want it. Save the va? */ 292 if (prom_mappings[i].va == 0) { 293 prom_mappings[i].va = va; 294 } 295 } 296 } 297 298} 299 300/* 301 * These are all the OBIO address that are required early in 302 * the life of the kernel. All are less than one page long. 303 * This function should make any required mappings that we 304 * were not able to find among the PROM monitor's mappings. 305 */ 306static void 307make_required_mappings __P((void)) 308{ 309 int i; 310 311 for (i = 0; i < PROM_MAP_CNT; i++) { 312 if (prom_mappings[i].va == 0) { 313 /* 314 * Actually, the PROM always has all the 315 * "required" mappings we need, (smile) 316 * but this makes sure that is true. 317 */ 318 mon_printf("obio: no mapping for pa=0x%x\n", 319 prom_mappings[i].pa); 320 sunmon_abort(); /* Ancient PROM? */ 321 } 322 } 323} 324 325 326/* 327 * Find mappings for devices that are needed before autoconfiguration. 328 * We first look for and record any useful PROM mappings, then call 329 * the "init" functions for drivers that we need to use before the 330 * normal autoconfiguration calls configure(). Warning: this is 331 * called before pmap_bootstrap, so no allocation allowed! 332 */ 333void 334obio_init() 335{ 336 save_prom_mappings(); 337 make_required_mappings(); 338 339 enable_init(); 340 341 /* 342 * Find the interrupt reg mapping and turn off the 343 * interrupts, otherwise the PROM clock interrupt 344 * would poll the zs and toggle some LEDs... 345 */ 346 intreg_init(); 347} 348