1 /* 2 * Miscellaneous Mac68K-specific stuff 3 */ 4 5 #include <linux/types.h> 6 #include <linux/errno.h> 7 #include <linux/kernel.h> 8 #include <linux/delay.h> 9 #include <linux/sched.h> 10 #include <linux/time.h> 11 #include <linux/rtc.h> 12 #include <linux/mm.h> 13 14 #include <linux/adb.h> 15 #include <linux/cuda.h> 16 #include <linux/pmu.h> 17 18 #include <linux/uaccess.h> 19 #include <asm/io.h> 20 #include <asm/segment.h> 21 #include <asm/setup.h> 22 #include <asm/macintosh.h> 23 #include <asm/mac_via.h> 24 #include <asm/mac_oss.h> 25 26 #include <asm/machdep.h> 27 28 /* Offset between Unix time (1970-based) and Mac time (1904-based) */ 29 30 #define RTC_OFFSET 2082844800 31 32 static void (*rom_reset)(void); 33 34 #ifdef CONFIG_ADB_CUDA 35 static long cuda_read_time(void) 36 { 37 struct adb_request req; 38 long time; 39 40 if (cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_GET_TIME) < 0) 41 return 0; 42 while (!req.complete) 43 cuda_poll(); 44 45 time = (req.reply[3] << 24) | (req.reply[4] << 16) 46 | (req.reply[5] << 8) | req.reply[6]; 47 return time - RTC_OFFSET; 48 } 49 50 static void cuda_write_time(long data) 51 { 52 struct adb_request req; 53 data += RTC_OFFSET; 54 if (cuda_request(&req, NULL, 6, CUDA_PACKET, CUDA_SET_TIME, 55 (data >> 24) & 0xFF, (data >> 16) & 0xFF, 56 (data >> 8) & 0xFF, data & 0xFF) < 0) 57 return; 58 while (!req.complete) 59 cuda_poll(); 60 } 61 62 static __u8 cuda_read_pram(int offset) 63 { 64 struct adb_request req; 65 if (cuda_request(&req, NULL, 4, CUDA_PACKET, CUDA_GET_PRAM, 66 (offset >> 8) & 0xFF, offset & 0xFF) < 0) 67 return 0; 68 while (!req.complete) 69 cuda_poll(); 70 return req.reply[3]; 71 } 72 73 static void cuda_write_pram(int offset, __u8 data) 74 { 75 struct adb_request req; 76 if (cuda_request(&req, NULL, 5, CUDA_PACKET, CUDA_SET_PRAM, 77 (offset >> 8) & 0xFF, offset & 0xFF, data) < 0) 78 return; 79 while (!req.complete) 80 cuda_poll(); 81 } 82 #else 83 #define cuda_read_time() 0 84 #define cuda_write_time(n) 85 #define cuda_read_pram NULL 86 #define cuda_write_pram NULL 87 #endif 88 89 #ifdef CONFIG_ADB_PMU68K 90 static long pmu_read_time(void) 91 { 92 struct adb_request req; 93 long time; 94 95 if (pmu_request(&req, NULL, 1, PMU_READ_RTC) < 0) 96 return 0; 97 while (!req.complete) 98 pmu_poll(); 99 100 time = (req.reply[1] << 24) | (req.reply[2] << 16) 101 | (req.reply[3] << 8) | req.reply[4]; 102 return time - RTC_OFFSET; 103 } 104 105 static void pmu_write_time(long data) 106 { 107 struct adb_request req; 108 data += RTC_OFFSET; 109 if (pmu_request(&req, NULL, 5, PMU_SET_RTC, 110 (data >> 24) & 0xFF, (data >> 16) & 0xFF, 111 (data >> 8) & 0xFF, data & 0xFF) < 0) 112 return; 113 while (!req.complete) 114 pmu_poll(); 115 } 116 117 static __u8 pmu_read_pram(int offset) 118 { 119 struct adb_request req; 120 if (pmu_request(&req, NULL, 3, PMU_READ_NVRAM, 121 (offset >> 8) & 0xFF, offset & 0xFF) < 0) 122 return 0; 123 while (!req.complete) 124 pmu_poll(); 125 return req.reply[3]; 126 } 127 128 static void pmu_write_pram(int offset, __u8 data) 129 { 130 struct adb_request req; 131 if (pmu_request(&req, NULL, 4, PMU_WRITE_NVRAM, 132 (offset >> 8) & 0xFF, offset & 0xFF, data) < 0) 133 return; 134 while (!req.complete) 135 pmu_poll(); 136 } 137 #else 138 #define pmu_read_time() 0 139 #define pmu_write_time(n) 140 #define pmu_read_pram NULL 141 #define pmu_write_pram NULL 142 #endif 143 144 /* 145 * VIA PRAM/RTC access routines 146 * 147 * Must be called with interrupts disabled and 148 * the RTC should be enabled. 149 */ 150 151 static __u8 via_pram_readbyte(void) 152 { 153 int i,reg; 154 __u8 data; 155 156 reg = via1[vBufB] & ~VIA1B_vRTCClk; 157 158 /* Set the RTC data line to be an input. */ 159 160 via1[vDirB] &= ~VIA1B_vRTCData; 161 162 /* The bits of the byte come out in MSB order */ 163 164 data = 0; 165 for (i = 0 ; i < 8 ; i++) { 166 via1[vBufB] = reg; 167 via1[vBufB] = reg | VIA1B_vRTCClk; 168 data = (data << 1) | (via1[vBufB] & VIA1B_vRTCData); 169 } 170 171 /* Return RTC data line to output state */ 172 173 via1[vDirB] |= VIA1B_vRTCData; 174 175 return data; 176 } 177 178 static void via_pram_writebyte(__u8 data) 179 { 180 int i,reg,bit; 181 182 reg = via1[vBufB] & ~(VIA1B_vRTCClk | VIA1B_vRTCData); 183 184 /* The bits of the byte go in in MSB order */ 185 186 for (i = 0 ; i < 8 ; i++) { 187 bit = data & 0x80? 1 : 0; 188 data <<= 1; 189 via1[vBufB] = reg | bit; 190 via1[vBufB] = reg | bit | VIA1B_vRTCClk; 191 } 192 } 193 194 /* 195 * Execute a VIA PRAM/RTC command. For read commands 196 * data should point to a one-byte buffer for the 197 * resulting data. For write commands it should point 198 * to the data byte to for the command. 199 * 200 * This function disables all interrupts while running. 201 */ 202 203 static void via_pram_command(int command, __u8 *data) 204 { 205 unsigned long flags; 206 int is_read; 207 208 local_irq_save(flags); 209 210 /* Enable the RTC and make sure the strobe line is high */ 211 212 via1[vBufB] = (via1[vBufB] | VIA1B_vRTCClk) & ~VIA1B_vRTCEnb; 213 214 if (command & 0xFF00) { /* extended (two-byte) command */ 215 via_pram_writebyte((command & 0xFF00) >> 8); 216 via_pram_writebyte(command & 0xFF); 217 is_read = command & 0x8000; 218 } else { /* one-byte command */ 219 via_pram_writebyte(command); 220 is_read = command & 0x80; 221 } 222 if (is_read) { 223 *data = via_pram_readbyte(); 224 } else { 225 via_pram_writebyte(*data); 226 } 227 228 /* All done, disable the RTC */ 229 230 via1[vBufB] |= VIA1B_vRTCEnb; 231 232 local_irq_restore(flags); 233 } 234 235 static __u8 via_read_pram(int offset) 236 { 237 return 0; 238 } 239 240 static void via_write_pram(int offset, __u8 data) 241 { 242 } 243 244 /* 245 * Return the current time in seconds since January 1, 1904. 246 * 247 * This only works on machines with the VIA-based PRAM/RTC, which 248 * is basically any machine with Mac II-style ADB. 249 */ 250 251 static long via_read_time(void) 252 { 253 union { 254 __u8 cdata[4]; 255 long idata; 256 } result, last_result; 257 int count = 1; 258 259 via_pram_command(0x81, &last_result.cdata[3]); 260 via_pram_command(0x85, &last_result.cdata[2]); 261 via_pram_command(0x89, &last_result.cdata[1]); 262 via_pram_command(0x8D, &last_result.cdata[0]); 263 264 /* 265 * The NetBSD guys say to loop until you get the same reading 266 * twice in a row. 267 */ 268 269 while (1) { 270 via_pram_command(0x81, &result.cdata[3]); 271 via_pram_command(0x85, &result.cdata[2]); 272 via_pram_command(0x89, &result.cdata[1]); 273 via_pram_command(0x8D, &result.cdata[0]); 274 275 if (result.idata == last_result.idata) 276 return result.idata - RTC_OFFSET; 277 278 if (++count > 10) 279 break; 280 281 last_result.idata = result.idata; 282 } 283 284 pr_err("via_read_time: failed to read a stable value; got 0x%08lx then 0x%08lx\n", 285 last_result.idata, result.idata); 286 287 return 0; 288 } 289 290 /* 291 * Set the current time to a number of seconds since January 1, 1904. 292 * 293 * This only works on machines with the VIA-based PRAM/RTC, which 294 * is basically any machine with Mac II-style ADB. 295 */ 296 297 static void via_write_time(long time) 298 { 299 union { 300 __u8 cdata[4]; 301 long idata; 302 } data; 303 __u8 temp; 304 305 /* Clear the write protect bit */ 306 307 temp = 0x55; 308 via_pram_command(0x35, &temp); 309 310 data.idata = time + RTC_OFFSET; 311 via_pram_command(0x01, &data.cdata[3]); 312 via_pram_command(0x05, &data.cdata[2]); 313 via_pram_command(0x09, &data.cdata[1]); 314 via_pram_command(0x0D, &data.cdata[0]); 315 316 /* Set the write protect bit */ 317 318 temp = 0xD5; 319 via_pram_command(0x35, &temp); 320 } 321 322 static void via_shutdown(void) 323 { 324 if (rbv_present) { 325 via2[rBufB] &= ~0x04; 326 } else { 327 /* Direction of vDirB is output */ 328 via2[vDirB] |= 0x04; 329 /* Send a value of 0 on that line */ 330 via2[vBufB] &= ~0x04; 331 mdelay(1000); 332 } 333 } 334 335 /* 336 * FIXME: not sure how this is supposed to work exactly... 337 */ 338 339 static void oss_shutdown(void) 340 { 341 oss->rom_ctrl = OSS_POWEROFF; 342 } 343 344 #ifdef CONFIG_ADB_CUDA 345 346 static void cuda_restart(void) 347 { 348 struct adb_request req; 349 if (cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_RESET_SYSTEM) < 0) 350 return; 351 while (!req.complete) 352 cuda_poll(); 353 } 354 355 static void cuda_shutdown(void) 356 { 357 struct adb_request req; 358 if (cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_POWERDOWN) < 0) 359 return; 360 while (!req.complete) 361 cuda_poll(); 362 } 363 364 #endif /* CONFIG_ADB_CUDA */ 365 366 #ifdef CONFIG_ADB_PMU68K 367 368 void pmu_restart(void) 369 { 370 struct adb_request req; 371 if (pmu_request(&req, NULL, 372 2, PMU_SET_INTR_MASK, PMU_INT_ADB|PMU_INT_TICK) < 0) 373 return; 374 while (!req.complete) 375 pmu_poll(); 376 if (pmu_request(&req, NULL, 1, PMU_RESET) < 0) 377 return; 378 while (!req.complete) 379 pmu_poll(); 380 } 381 382 void pmu_shutdown(void) 383 { 384 struct adb_request req; 385 if (pmu_request(&req, NULL, 386 2, PMU_SET_INTR_MASK, PMU_INT_ADB|PMU_INT_TICK) < 0) 387 return; 388 while (!req.complete) 389 pmu_poll(); 390 if (pmu_request(&req, NULL, 5, PMU_SHUTDOWN, 'M', 'A', 'T', 'T') < 0) 391 return; 392 while (!req.complete) 393 pmu_poll(); 394 } 395 396 #endif 397 398 /* 399 *------------------------------------------------------------------- 400 * Below this point are the generic routines; they'll dispatch to the 401 * correct routine for the hardware on which we're running. 402 *------------------------------------------------------------------- 403 */ 404 405 void mac_pram_read(int offset, __u8 *buffer, int len) 406 { 407 __u8 (*func)(int); 408 int i; 409 410 switch(macintosh_config->adb_type) { 411 case MAC_ADB_PB1: 412 case MAC_ADB_PB2: 413 func = pmu_read_pram; break; 414 case MAC_ADB_EGRET: 415 case MAC_ADB_CUDA: 416 func = cuda_read_pram; break; 417 default: 418 func = via_read_pram; 419 } 420 if (!func) 421 return; 422 for (i = 0 ; i < len ; i++) { 423 buffer[i] = (*func)(offset++); 424 } 425 } 426 427 void mac_pram_write(int offset, __u8 *buffer, int len) 428 { 429 void (*func)(int, __u8); 430 int i; 431 432 switch(macintosh_config->adb_type) { 433 case MAC_ADB_PB1: 434 case MAC_ADB_PB2: 435 func = pmu_write_pram; break; 436 case MAC_ADB_EGRET: 437 case MAC_ADB_CUDA: 438 func = cuda_write_pram; break; 439 default: 440 func = via_write_pram; 441 } 442 if (!func) 443 return; 444 for (i = 0 ; i < len ; i++) { 445 (*func)(offset++, buffer[i]); 446 } 447 } 448 449 void mac_poweroff(void) 450 { 451 if (oss_present) { 452 oss_shutdown(); 453 } else if (macintosh_config->adb_type == MAC_ADB_II) { 454 via_shutdown(); 455 #ifdef CONFIG_ADB_CUDA 456 } else if (macintosh_config->adb_type == MAC_ADB_EGRET || 457 macintosh_config->adb_type == MAC_ADB_CUDA) { 458 cuda_shutdown(); 459 #endif 460 #ifdef CONFIG_ADB_PMU68K 461 } else if (macintosh_config->adb_type == MAC_ADB_PB1 462 || macintosh_config->adb_type == MAC_ADB_PB2) { 463 pmu_shutdown(); 464 #endif 465 } 466 local_irq_enable(); 467 pr_crit("It is now safe to turn off your Macintosh.\n"); 468 while(1); 469 } 470 471 void mac_reset(void) 472 { 473 if (macintosh_config->adb_type == MAC_ADB_II) { 474 unsigned long flags; 475 476 /* need ROMBASE in booter */ 477 /* indeed, plus need to MAP THE ROM !! */ 478 479 if (mac_bi_data.rombase == 0) 480 mac_bi_data.rombase = 0x40800000; 481 482 /* works on some */ 483 rom_reset = (void *) (mac_bi_data.rombase + 0xa); 484 485 if (macintosh_config->ident == MAC_MODEL_SE30) { 486 /* 487 * MSch: Machines known to crash on ROM reset ... 488 */ 489 } else { 490 local_irq_save(flags); 491 492 rom_reset(); 493 494 local_irq_restore(flags); 495 } 496 #ifdef CONFIG_ADB_CUDA 497 } else if (macintosh_config->adb_type == MAC_ADB_EGRET || 498 macintosh_config->adb_type == MAC_ADB_CUDA) { 499 cuda_restart(); 500 #endif 501 #ifdef CONFIG_ADB_PMU68K 502 } else if (macintosh_config->adb_type == MAC_ADB_PB1 503 || macintosh_config->adb_type == MAC_ADB_PB2) { 504 pmu_restart(); 505 #endif 506 } else if (CPU_IS_030) { 507 508 /* 030-specific reset routine. The idea is general, but the 509 * specific registers to reset are '030-specific. Until I 510 * have a non-030 machine, I can't test anything else. 511 * -- C. Scott Ananian <cananian@alumni.princeton.edu> 512 */ 513 514 unsigned long rombase = 0x40000000; 515 516 /* make a 1-to-1 mapping, using the transparent tran. reg. */ 517 unsigned long virt = (unsigned long) mac_reset; 518 unsigned long phys = virt_to_phys(mac_reset); 519 unsigned long addr = (phys&0xFF000000)|0x8777; 520 unsigned long offset = phys-virt; 521 local_irq_disable(); /* lets not screw this up, ok? */ 522 __asm__ __volatile__(".chip 68030\n\t" 523 "pmove %0,%/tt0\n\t" 524 ".chip 68k" 525 : : "m" (addr)); 526 /* Now jump to physical address so we can disable MMU */ 527 __asm__ __volatile__( 528 ".chip 68030\n\t" 529 "lea %/pc@(1f),%/a0\n\t" 530 "addl %0,%/a0\n\t"/* fixup target address and stack ptr */ 531 "addl %0,%/sp\n\t" 532 "pflusha\n\t" 533 "jmp %/a0@\n\t" /* jump into physical memory */ 534 "0:.long 0\n\t" /* a constant zero. */ 535 /* OK. Now reset everything and jump to reset vector. */ 536 "1:\n\t" 537 "lea %/pc@(0b),%/a0\n\t" 538 "pmove %/a0@, %/tc\n\t" /* disable mmu */ 539 "pmove %/a0@, %/tt0\n\t" /* disable tt0 */ 540 "pmove %/a0@, %/tt1\n\t" /* disable tt1 */ 541 "movel #0, %/a0\n\t" 542 "movec %/a0, %/vbr\n\t" /* clear vector base register */ 543 "movec %/a0, %/cacr\n\t" /* disable caches */ 544 "movel #0x0808,%/a0\n\t" 545 "movec %/a0, %/cacr\n\t" /* flush i&d caches */ 546 "movew #0x2700,%/sr\n\t" /* set up status register */ 547 "movel %1@(0x0),%/a0\n\t"/* load interrupt stack pointer */ 548 "movec %/a0, %/isp\n\t" 549 "movel %1@(0x4),%/a0\n\t" /* load reset vector */ 550 "reset\n\t" /* reset external devices */ 551 "jmp %/a0@\n\t" /* jump to the reset vector */ 552 ".chip 68k" 553 : : "r" (offset), "a" (rombase) : "a0"); 554 } 555 556 /* should never get here */ 557 local_irq_enable(); 558 pr_crit("Restart failed. Please restart manually.\n"); 559 while(1); 560 } 561 562 /* 563 * This function translates seconds since 1970 into a proper date. 564 * 565 * Algorithm cribbed from glibc2.1, __offtime(). 566 */ 567 #define SECS_PER_MINUTE (60) 568 #define SECS_PER_HOUR (SECS_PER_MINUTE * 60) 569 #define SECS_PER_DAY (SECS_PER_HOUR * 24) 570 571 static void unmktime(unsigned long time, long offset, 572 int *yearp, int *monp, int *dayp, 573 int *hourp, int *minp, int *secp) 574 { 575 /* How many days come before each month (0-12). */ 576 static const unsigned short int __mon_yday[2][13] = 577 { 578 /* Normal years. */ 579 { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 }, 580 /* Leap years. */ 581 { 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 } 582 }; 583 long int days, rem, y, wday, yday; 584 const unsigned short int *ip; 585 586 days = time / SECS_PER_DAY; 587 rem = time % SECS_PER_DAY; 588 rem += offset; 589 while (rem < 0) { 590 rem += SECS_PER_DAY; 591 --days; 592 } 593 while (rem >= SECS_PER_DAY) { 594 rem -= SECS_PER_DAY; 595 ++days; 596 } 597 *hourp = rem / SECS_PER_HOUR; 598 rem %= SECS_PER_HOUR; 599 *minp = rem / SECS_PER_MINUTE; 600 *secp = rem % SECS_PER_MINUTE; 601 /* January 1, 1970 was a Thursday. */ 602 wday = (4 + days) % 7; /* Day in the week. Not currently used */ 603 if (wday < 0) wday += 7; 604 y = 1970; 605 606 #define DIV(a, b) ((a) / (b) - ((a) % (b) < 0)) 607 #define LEAPS_THRU_END_OF(y) (DIV (y, 4) - DIV (y, 100) + DIV (y, 400)) 608 #define __isleap(year) \ 609 ((year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0)) 610 611 while (days < 0 || days >= (__isleap (y) ? 366 : 365)) 612 { 613 /* Guess a corrected year, assuming 365 days per year. */ 614 long int yg = y + days / 365 - (days % 365 < 0); 615 616 /* Adjust DAYS and Y to match the guessed year. */ 617 days -= ((yg - y) * 365 618 + LEAPS_THRU_END_OF (yg - 1) 619 - LEAPS_THRU_END_OF (y - 1)); 620 y = yg; 621 } 622 *yearp = y - 1900; 623 yday = days; /* day in the year. Not currently used. */ 624 ip = __mon_yday[__isleap(y)]; 625 for (y = 11; days < (long int) ip[y]; --y) 626 continue; 627 days -= ip[y]; 628 *monp = y; 629 *dayp = days + 1; /* day in the month */ 630 return; 631 } 632 633 /* 634 * Read/write the hardware clock. 635 */ 636 637 int mac_hwclk(int op, struct rtc_time *t) 638 { 639 unsigned long now; 640 641 if (!op) { /* read */ 642 switch (macintosh_config->adb_type) { 643 case MAC_ADB_II: 644 case MAC_ADB_IOP: 645 now = via_read_time(); 646 break; 647 case MAC_ADB_PB1: 648 case MAC_ADB_PB2: 649 now = pmu_read_time(); 650 break; 651 case MAC_ADB_EGRET: 652 case MAC_ADB_CUDA: 653 now = cuda_read_time(); 654 break; 655 default: 656 now = 0; 657 } 658 659 t->tm_wday = 0; 660 unmktime(now, 0, 661 &t->tm_year, &t->tm_mon, &t->tm_mday, 662 &t->tm_hour, &t->tm_min, &t->tm_sec); 663 pr_debug("%s: read %04d-%02d-%-2d %02d:%02d:%02d\n", 664 __func__, t->tm_year + 1900, t->tm_mon + 1, t->tm_mday, 665 t->tm_hour, t->tm_min, t->tm_sec); 666 } else { /* write */ 667 pr_debug("%s: tried to write %04d-%02d-%-2d %02d:%02d:%02d\n", 668 __func__, t->tm_year + 1900, t->tm_mon + 1, t->tm_mday, 669 t->tm_hour, t->tm_min, t->tm_sec); 670 671 now = mktime(t->tm_year + 1900, t->tm_mon + 1, t->tm_mday, 672 t->tm_hour, t->tm_min, t->tm_sec); 673 674 switch (macintosh_config->adb_type) { 675 case MAC_ADB_II: 676 case MAC_ADB_IOP: 677 via_write_time(now); 678 break; 679 case MAC_ADB_EGRET: 680 case MAC_ADB_CUDA: 681 cuda_write_time(now); 682 break; 683 case MAC_ADB_PB1: 684 case MAC_ADB_PB2: 685 pmu_write_time(now); 686 break; 687 } 688 } 689 return 0; 690 } 691 692 /* 693 * Set minutes/seconds in the hardware clock 694 */ 695 696 int mac_set_clock_mmss (unsigned long nowtime) 697 { 698 struct rtc_time now; 699 700 mac_hwclk(0, &now); 701 now.tm_sec = nowtime % 60; 702 now.tm_min = (nowtime / 60) % 60; 703 mac_hwclk(1, &now); 704 705 return 0; 706 } 707