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; 360 361 /* Avoid infinite polling loop when PSU is not under Cuda control */ 362 switch (macintosh_config->ident) { 363 case MAC_MODEL_C660: 364 case MAC_MODEL_Q605: 365 case MAC_MODEL_Q605_ACC: 366 case MAC_MODEL_P475: 367 case MAC_MODEL_P475F: 368 return; 369 } 370 371 while (!req.complete) 372 cuda_poll(); 373 } 374 375 #endif /* CONFIG_ADB_CUDA */ 376 377 #ifdef CONFIG_ADB_PMU68K 378 379 void pmu_restart(void) 380 { 381 struct adb_request req; 382 if (pmu_request(&req, NULL, 383 2, PMU_SET_INTR_MASK, PMU_INT_ADB|PMU_INT_TICK) < 0) 384 return; 385 while (!req.complete) 386 pmu_poll(); 387 if (pmu_request(&req, NULL, 1, PMU_RESET) < 0) 388 return; 389 while (!req.complete) 390 pmu_poll(); 391 } 392 393 void pmu_shutdown(void) 394 { 395 struct adb_request req; 396 if (pmu_request(&req, NULL, 397 2, PMU_SET_INTR_MASK, PMU_INT_ADB|PMU_INT_TICK) < 0) 398 return; 399 while (!req.complete) 400 pmu_poll(); 401 if (pmu_request(&req, NULL, 5, PMU_SHUTDOWN, 'M', 'A', 'T', 'T') < 0) 402 return; 403 while (!req.complete) 404 pmu_poll(); 405 } 406 407 #endif 408 409 /* 410 *------------------------------------------------------------------- 411 * Below this point are the generic routines; they'll dispatch to the 412 * correct routine for the hardware on which we're running. 413 *------------------------------------------------------------------- 414 */ 415 416 void mac_pram_read(int offset, __u8 *buffer, int len) 417 { 418 __u8 (*func)(int); 419 int i; 420 421 switch(macintosh_config->adb_type) { 422 case MAC_ADB_PB1: 423 case MAC_ADB_PB2: 424 func = pmu_read_pram; break; 425 case MAC_ADB_EGRET: 426 case MAC_ADB_CUDA: 427 func = cuda_read_pram; break; 428 default: 429 func = via_read_pram; 430 } 431 if (!func) 432 return; 433 for (i = 0 ; i < len ; i++) { 434 buffer[i] = (*func)(offset++); 435 } 436 } 437 438 void mac_pram_write(int offset, __u8 *buffer, int len) 439 { 440 void (*func)(int, __u8); 441 int i; 442 443 switch(macintosh_config->adb_type) { 444 case MAC_ADB_PB1: 445 case MAC_ADB_PB2: 446 func = pmu_write_pram; break; 447 case MAC_ADB_EGRET: 448 case MAC_ADB_CUDA: 449 func = cuda_write_pram; break; 450 default: 451 func = via_write_pram; 452 } 453 if (!func) 454 return; 455 for (i = 0 ; i < len ; i++) { 456 (*func)(offset++, buffer[i]); 457 } 458 } 459 460 void mac_poweroff(void) 461 { 462 if (oss_present) { 463 oss_shutdown(); 464 } else if (macintosh_config->adb_type == MAC_ADB_II) { 465 via_shutdown(); 466 #ifdef CONFIG_ADB_CUDA 467 } else if (macintosh_config->adb_type == MAC_ADB_EGRET || 468 macintosh_config->adb_type == MAC_ADB_CUDA) { 469 cuda_shutdown(); 470 #endif 471 #ifdef CONFIG_ADB_PMU68K 472 } else if (macintosh_config->adb_type == MAC_ADB_PB1 473 || macintosh_config->adb_type == MAC_ADB_PB2) { 474 pmu_shutdown(); 475 #endif 476 } 477 478 pr_crit("It is now safe to turn off your Macintosh.\n"); 479 local_irq_disable(); 480 while(1); 481 } 482 483 void mac_reset(void) 484 { 485 if (macintosh_config->adb_type == MAC_ADB_II) { 486 unsigned long flags; 487 488 /* need ROMBASE in booter */ 489 /* indeed, plus need to MAP THE ROM !! */ 490 491 if (mac_bi_data.rombase == 0) 492 mac_bi_data.rombase = 0x40800000; 493 494 /* works on some */ 495 rom_reset = (void *) (mac_bi_data.rombase + 0xa); 496 497 if (macintosh_config->ident == MAC_MODEL_SE30) { 498 /* 499 * MSch: Machines known to crash on ROM reset ... 500 */ 501 } else { 502 local_irq_save(flags); 503 504 rom_reset(); 505 506 local_irq_restore(flags); 507 } 508 #ifdef CONFIG_ADB_CUDA 509 } else if (macintosh_config->adb_type == MAC_ADB_EGRET || 510 macintosh_config->adb_type == MAC_ADB_CUDA) { 511 cuda_restart(); 512 #endif 513 #ifdef CONFIG_ADB_PMU68K 514 } else if (macintosh_config->adb_type == MAC_ADB_PB1 515 || macintosh_config->adb_type == MAC_ADB_PB2) { 516 pmu_restart(); 517 #endif 518 } else if (CPU_IS_030) { 519 520 /* 030-specific reset routine. The idea is general, but the 521 * specific registers to reset are '030-specific. Until I 522 * have a non-030 machine, I can't test anything else. 523 * -- C. Scott Ananian <cananian@alumni.princeton.edu> 524 */ 525 526 unsigned long rombase = 0x40000000; 527 528 /* make a 1-to-1 mapping, using the transparent tran. reg. */ 529 unsigned long virt = (unsigned long) mac_reset; 530 unsigned long phys = virt_to_phys(mac_reset); 531 unsigned long addr = (phys&0xFF000000)|0x8777; 532 unsigned long offset = phys-virt; 533 local_irq_disable(); /* lets not screw this up, ok? */ 534 __asm__ __volatile__(".chip 68030\n\t" 535 "pmove %0,%/tt0\n\t" 536 ".chip 68k" 537 : : "m" (addr)); 538 /* Now jump to physical address so we can disable MMU */ 539 __asm__ __volatile__( 540 ".chip 68030\n\t" 541 "lea %/pc@(1f),%/a0\n\t" 542 "addl %0,%/a0\n\t"/* fixup target address and stack ptr */ 543 "addl %0,%/sp\n\t" 544 "pflusha\n\t" 545 "jmp %/a0@\n\t" /* jump into physical memory */ 546 "0:.long 0\n\t" /* a constant zero. */ 547 /* OK. Now reset everything and jump to reset vector. */ 548 "1:\n\t" 549 "lea %/pc@(0b),%/a0\n\t" 550 "pmove %/a0@, %/tc\n\t" /* disable mmu */ 551 "pmove %/a0@, %/tt0\n\t" /* disable tt0 */ 552 "pmove %/a0@, %/tt1\n\t" /* disable tt1 */ 553 "movel #0, %/a0\n\t" 554 "movec %/a0, %/vbr\n\t" /* clear vector base register */ 555 "movec %/a0, %/cacr\n\t" /* disable caches */ 556 "movel #0x0808,%/a0\n\t" 557 "movec %/a0, %/cacr\n\t" /* flush i&d caches */ 558 "movew #0x2700,%/sr\n\t" /* set up status register */ 559 "movel %1@(0x0),%/a0\n\t"/* load interrupt stack pointer */ 560 "movec %/a0, %/isp\n\t" 561 "movel %1@(0x4),%/a0\n\t" /* load reset vector */ 562 "reset\n\t" /* reset external devices */ 563 "jmp %/a0@\n\t" /* jump to the reset vector */ 564 ".chip 68k" 565 : : "r" (offset), "a" (rombase) : "a0"); 566 } 567 568 /* should never get here */ 569 pr_crit("Restart failed. Please restart manually.\n"); 570 local_irq_disable(); 571 while(1); 572 } 573 574 /* 575 * This function translates seconds since 1970 into a proper date. 576 * 577 * Algorithm cribbed from glibc2.1, __offtime(). 578 */ 579 #define SECS_PER_MINUTE (60) 580 #define SECS_PER_HOUR (SECS_PER_MINUTE * 60) 581 #define SECS_PER_DAY (SECS_PER_HOUR * 24) 582 583 static void unmktime(unsigned long time, long offset, 584 int *yearp, int *monp, int *dayp, 585 int *hourp, int *minp, int *secp) 586 { 587 /* How many days come before each month (0-12). */ 588 static const unsigned short int __mon_yday[2][13] = 589 { 590 /* Normal years. */ 591 { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 }, 592 /* Leap years. */ 593 { 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 } 594 }; 595 long int days, rem, y, wday, yday; 596 const unsigned short int *ip; 597 598 days = time / SECS_PER_DAY; 599 rem = time % SECS_PER_DAY; 600 rem += offset; 601 while (rem < 0) { 602 rem += SECS_PER_DAY; 603 --days; 604 } 605 while (rem >= SECS_PER_DAY) { 606 rem -= SECS_PER_DAY; 607 ++days; 608 } 609 *hourp = rem / SECS_PER_HOUR; 610 rem %= SECS_PER_HOUR; 611 *minp = rem / SECS_PER_MINUTE; 612 *secp = rem % SECS_PER_MINUTE; 613 /* January 1, 1970 was a Thursday. */ 614 wday = (4 + days) % 7; /* Day in the week. Not currently used */ 615 if (wday < 0) wday += 7; 616 y = 1970; 617 618 #define DIV(a, b) ((a) / (b) - ((a) % (b) < 0)) 619 #define LEAPS_THRU_END_OF(y) (DIV (y, 4) - DIV (y, 100) + DIV (y, 400)) 620 #define __isleap(year) \ 621 ((year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0)) 622 623 while (days < 0 || days >= (__isleap (y) ? 366 : 365)) 624 { 625 /* Guess a corrected year, assuming 365 days per year. */ 626 long int yg = y + days / 365 - (days % 365 < 0); 627 628 /* Adjust DAYS and Y to match the guessed year. */ 629 days -= ((yg - y) * 365 630 + LEAPS_THRU_END_OF (yg - 1) 631 - LEAPS_THRU_END_OF (y - 1)); 632 y = yg; 633 } 634 *yearp = y - 1900; 635 yday = days; /* day in the year. Not currently used. */ 636 ip = __mon_yday[__isleap(y)]; 637 for (y = 11; days < (long int) ip[y]; --y) 638 continue; 639 days -= ip[y]; 640 *monp = y; 641 *dayp = days + 1; /* day in the month */ 642 return; 643 } 644 645 /* 646 * Read/write the hardware clock. 647 */ 648 649 int mac_hwclk(int op, struct rtc_time *t) 650 { 651 unsigned long now; 652 653 if (!op) { /* read */ 654 switch (macintosh_config->adb_type) { 655 case MAC_ADB_II: 656 case MAC_ADB_IOP: 657 now = via_read_time(); 658 break; 659 case MAC_ADB_PB1: 660 case MAC_ADB_PB2: 661 now = pmu_read_time(); 662 break; 663 case MAC_ADB_EGRET: 664 case MAC_ADB_CUDA: 665 now = cuda_read_time(); 666 break; 667 default: 668 now = 0; 669 } 670 671 t->tm_wday = 0; 672 unmktime(now, 0, 673 &t->tm_year, &t->tm_mon, &t->tm_mday, 674 &t->tm_hour, &t->tm_min, &t->tm_sec); 675 pr_debug("%s: read %04d-%02d-%-2d %02d:%02d:%02d\n", 676 __func__, t->tm_year + 1900, t->tm_mon + 1, t->tm_mday, 677 t->tm_hour, t->tm_min, t->tm_sec); 678 } else { /* write */ 679 pr_debug("%s: tried to write %04d-%02d-%-2d %02d:%02d:%02d\n", 680 __func__, t->tm_year + 1900, t->tm_mon + 1, t->tm_mday, 681 t->tm_hour, t->tm_min, t->tm_sec); 682 683 now = mktime(t->tm_year + 1900, t->tm_mon + 1, t->tm_mday, 684 t->tm_hour, t->tm_min, t->tm_sec); 685 686 switch (macintosh_config->adb_type) { 687 case MAC_ADB_II: 688 case MAC_ADB_IOP: 689 via_write_time(now); 690 break; 691 case MAC_ADB_EGRET: 692 case MAC_ADB_CUDA: 693 cuda_write_time(now); 694 break; 695 case MAC_ADB_PB1: 696 case MAC_ADB_PB2: 697 pmu_write_time(now); 698 break; 699 } 700 } 701 return 0; 702 } 703 704 /* 705 * Set minutes/seconds in the hardware clock 706 */ 707 708 int mac_set_clock_mmss (unsigned long nowtime) 709 { 710 struct rtc_time now; 711 712 mac_hwclk(0, &now); 713 now.tm_sec = nowtime % 60; 714 now.tm_min = (nowtime / 60) % 60; 715 mac_hwclk(1, &now); 716 717 return 0; 718 } 719