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; " 285 "got 0x%08lx then 0x%08lx\n", 286 last_result.idata, result.idata); 287 288 return 0; 289 } 290 291 /* 292 * Set the current time to a number of seconds since January 1, 1904. 293 * 294 * This only works on machines with the VIA-based PRAM/RTC, which 295 * is basically any machine with Mac II-style ADB. 296 */ 297 298 static void via_write_time(long time) 299 { 300 union { 301 __u8 cdata[4]; 302 long idata; 303 } data; 304 __u8 temp; 305 306 /* Clear the write protect bit */ 307 308 temp = 0x55; 309 via_pram_command(0x35, &temp); 310 311 data.idata = time + RTC_OFFSET; 312 via_pram_command(0x01, &data.cdata[3]); 313 via_pram_command(0x05, &data.cdata[2]); 314 via_pram_command(0x09, &data.cdata[1]); 315 via_pram_command(0x0D, &data.cdata[0]); 316 317 /* Set the write protect bit */ 318 319 temp = 0xD5; 320 via_pram_command(0x35, &temp); 321 } 322 323 static void via_shutdown(void) 324 { 325 if (rbv_present) { 326 via2[rBufB] &= ~0x04; 327 } else { 328 /* Direction of vDirB is output */ 329 via2[vDirB] |= 0x04; 330 /* Send a value of 0 on that line */ 331 via2[vBufB] &= ~0x04; 332 mdelay(1000); 333 } 334 } 335 336 /* 337 * FIXME: not sure how this is supposed to work exactly... 338 */ 339 340 static void oss_shutdown(void) 341 { 342 oss->rom_ctrl = OSS_POWEROFF; 343 } 344 345 #ifdef CONFIG_ADB_CUDA 346 347 static void cuda_restart(void) 348 { 349 struct adb_request req; 350 if (cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_RESET_SYSTEM) < 0) 351 return; 352 while (!req.complete) 353 cuda_poll(); 354 } 355 356 static void cuda_shutdown(void) 357 { 358 struct adb_request req; 359 if (cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_POWERDOWN) < 0) 360 return; 361 while (!req.complete) 362 cuda_poll(); 363 } 364 365 #endif /* CONFIG_ADB_CUDA */ 366 367 #ifdef CONFIG_ADB_PMU68K 368 369 void pmu_restart(void) 370 { 371 struct adb_request req; 372 if (pmu_request(&req, NULL, 373 2, PMU_SET_INTR_MASK, PMU_INT_ADB|PMU_INT_TICK) < 0) 374 return; 375 while (!req.complete) 376 pmu_poll(); 377 if (pmu_request(&req, NULL, 1, PMU_RESET) < 0) 378 return; 379 while (!req.complete) 380 pmu_poll(); 381 } 382 383 void pmu_shutdown(void) 384 { 385 struct adb_request req; 386 if (pmu_request(&req, NULL, 387 2, PMU_SET_INTR_MASK, PMU_INT_ADB|PMU_INT_TICK) < 0) 388 return; 389 while (!req.complete) 390 pmu_poll(); 391 if (pmu_request(&req, NULL, 5, PMU_SHUTDOWN, 'M', 'A', 'T', 'T') < 0) 392 return; 393 while (!req.complete) 394 pmu_poll(); 395 } 396 397 #endif 398 399 /* 400 *------------------------------------------------------------------- 401 * Below this point are the generic routines; they'll dispatch to the 402 * correct routine for the hardware on which we're running. 403 *------------------------------------------------------------------- 404 */ 405 406 void mac_pram_read(int offset, __u8 *buffer, int len) 407 { 408 __u8 (*func)(int); 409 int i; 410 411 switch(macintosh_config->adb_type) { 412 case MAC_ADB_PB1: 413 case MAC_ADB_PB2: 414 func = pmu_read_pram; break; 415 case MAC_ADB_EGRET: 416 case MAC_ADB_CUDA: 417 func = cuda_read_pram; break; 418 default: 419 func = via_read_pram; 420 } 421 if (!func) 422 return; 423 for (i = 0 ; i < len ; i++) { 424 buffer[i] = (*func)(offset++); 425 } 426 } 427 428 void mac_pram_write(int offset, __u8 *buffer, int len) 429 { 430 void (*func)(int, __u8); 431 int i; 432 433 switch(macintosh_config->adb_type) { 434 case MAC_ADB_PB1: 435 case MAC_ADB_PB2: 436 func = pmu_write_pram; break; 437 case MAC_ADB_EGRET: 438 case MAC_ADB_CUDA: 439 func = cuda_write_pram; break; 440 default: 441 func = via_write_pram; 442 } 443 if (!func) 444 return; 445 for (i = 0 ; i < len ; i++) { 446 (*func)(offset++, buffer[i]); 447 } 448 } 449 450 void mac_poweroff(void) 451 { 452 if (oss_present) { 453 oss_shutdown(); 454 } else if (macintosh_config->adb_type == MAC_ADB_II) { 455 via_shutdown(); 456 #ifdef CONFIG_ADB_CUDA 457 } else if (macintosh_config->adb_type == MAC_ADB_EGRET || 458 macintosh_config->adb_type == MAC_ADB_CUDA) { 459 cuda_shutdown(); 460 #endif 461 #ifdef CONFIG_ADB_PMU68K 462 } else if (macintosh_config->adb_type == MAC_ADB_PB1 463 || macintosh_config->adb_type == MAC_ADB_PB2) { 464 pmu_shutdown(); 465 #endif 466 } 467 local_irq_enable(); 468 printk("It is now safe to turn off your Macintosh.\n"); 469 while(1); 470 } 471 472 void mac_reset(void) 473 { 474 if (macintosh_config->adb_type == MAC_ADB_II) { 475 unsigned long flags; 476 477 /* need ROMBASE in booter */ 478 /* indeed, plus need to MAP THE ROM !! */ 479 480 if (mac_bi_data.rombase == 0) 481 mac_bi_data.rombase = 0x40800000; 482 483 /* works on some */ 484 rom_reset = (void *) (mac_bi_data.rombase + 0xa); 485 486 if (macintosh_config->ident == MAC_MODEL_SE30) { 487 /* 488 * MSch: Machines known to crash on ROM reset ... 489 */ 490 } else { 491 local_irq_save(flags); 492 493 rom_reset(); 494 495 local_irq_restore(flags); 496 } 497 #ifdef CONFIG_ADB_CUDA 498 } else if (macintosh_config->adb_type == MAC_ADB_EGRET || 499 macintosh_config->adb_type == MAC_ADB_CUDA) { 500 cuda_restart(); 501 #endif 502 #ifdef CONFIG_ADB_PMU68K 503 } else if (macintosh_config->adb_type == MAC_ADB_PB1 504 || macintosh_config->adb_type == MAC_ADB_PB2) { 505 pmu_restart(); 506 #endif 507 } else if (CPU_IS_030) { 508 509 /* 030-specific reset routine. The idea is general, but the 510 * specific registers to reset are '030-specific. Until I 511 * have a non-030 machine, I can't test anything else. 512 * -- C. Scott Ananian <cananian@alumni.princeton.edu> 513 */ 514 515 unsigned long rombase = 0x40000000; 516 517 /* make a 1-to-1 mapping, using the transparent tran. reg. */ 518 unsigned long virt = (unsigned long) mac_reset; 519 unsigned long phys = virt_to_phys(mac_reset); 520 unsigned long addr = (phys&0xFF000000)|0x8777; 521 unsigned long offset = phys-virt; 522 local_irq_disable(); /* lets not screw this up, ok? */ 523 __asm__ __volatile__(".chip 68030\n\t" 524 "pmove %0,%/tt0\n\t" 525 ".chip 68k" 526 : : "m" (addr)); 527 /* Now jump to physical address so we can disable MMU */ 528 __asm__ __volatile__( 529 ".chip 68030\n\t" 530 "lea %/pc@(1f),%/a0\n\t" 531 "addl %0,%/a0\n\t"/* fixup target address and stack ptr */ 532 "addl %0,%/sp\n\t" 533 "pflusha\n\t" 534 "jmp %/a0@\n\t" /* jump into physical memory */ 535 "0:.long 0\n\t" /* a constant zero. */ 536 /* OK. Now reset everything and jump to reset vector. */ 537 "1:\n\t" 538 "lea %/pc@(0b),%/a0\n\t" 539 "pmove %/a0@, %/tc\n\t" /* disable mmu */ 540 "pmove %/a0@, %/tt0\n\t" /* disable tt0 */ 541 "pmove %/a0@, %/tt1\n\t" /* disable tt1 */ 542 "movel #0, %/a0\n\t" 543 "movec %/a0, %/vbr\n\t" /* clear vector base register */ 544 "movec %/a0, %/cacr\n\t" /* disable caches */ 545 "movel #0x0808,%/a0\n\t" 546 "movec %/a0, %/cacr\n\t" /* flush i&d caches */ 547 "movew #0x2700,%/sr\n\t" /* set up status register */ 548 "movel %1@(0x0),%/a0\n\t"/* load interrupt stack pointer */ 549 "movec %/a0, %/isp\n\t" 550 "movel %1@(0x4),%/a0\n\t" /* load reset vector */ 551 "reset\n\t" /* reset external devices */ 552 "jmp %/a0@\n\t" /* jump to the reset vector */ 553 ".chip 68k" 554 : : "r" (offset), "a" (rombase) : "a0"); 555 } 556 557 /* should never get here */ 558 local_irq_enable(); 559 printk ("Restart failed. Please restart manually.\n"); 560 while(1); 561 } 562 563 /* 564 * This function translates seconds since 1970 into a proper date. 565 * 566 * Algorithm cribbed from glibc2.1, __offtime(). 567 */ 568 #define SECS_PER_MINUTE (60) 569 #define SECS_PER_HOUR (SECS_PER_MINUTE * 60) 570 #define SECS_PER_DAY (SECS_PER_HOUR * 24) 571 572 static void unmktime(unsigned long time, long offset, 573 int *yearp, int *monp, int *dayp, 574 int *hourp, int *minp, int *secp) 575 { 576 /* How many days come before each month (0-12). */ 577 static const unsigned short int __mon_yday[2][13] = 578 { 579 /* Normal years. */ 580 { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 }, 581 /* Leap years. */ 582 { 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 } 583 }; 584 long int days, rem, y, wday, yday; 585 const unsigned short int *ip; 586 587 days = time / SECS_PER_DAY; 588 rem = time % SECS_PER_DAY; 589 rem += offset; 590 while (rem < 0) { 591 rem += SECS_PER_DAY; 592 --days; 593 } 594 while (rem >= SECS_PER_DAY) { 595 rem -= SECS_PER_DAY; 596 ++days; 597 } 598 *hourp = rem / SECS_PER_HOUR; 599 rem %= SECS_PER_HOUR; 600 *minp = rem / SECS_PER_MINUTE; 601 *secp = rem % SECS_PER_MINUTE; 602 /* January 1, 1970 was a Thursday. */ 603 wday = (4 + days) % 7; /* Day in the week. Not currently used */ 604 if (wday < 0) wday += 7; 605 y = 1970; 606 607 #define DIV(a, b) ((a) / (b) - ((a) % (b) < 0)) 608 #define LEAPS_THRU_END_OF(y) (DIV (y, 4) - DIV (y, 100) + DIV (y, 400)) 609 #define __isleap(year) \ 610 ((year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0)) 611 612 while (days < 0 || days >= (__isleap (y) ? 366 : 365)) 613 { 614 /* Guess a corrected year, assuming 365 days per year. */ 615 long int yg = y + days / 365 - (days % 365 < 0); 616 617 /* Adjust DAYS and Y to match the guessed year. */ 618 days -= ((yg - y) * 365 619 + LEAPS_THRU_END_OF (yg - 1) 620 - LEAPS_THRU_END_OF (y - 1)); 621 y = yg; 622 } 623 *yearp = y - 1900; 624 yday = days; /* day in the year. Not currently used. */ 625 ip = __mon_yday[__isleap(y)]; 626 for (y = 11; days < (long int) ip[y]; --y) 627 continue; 628 days -= ip[y]; 629 *monp = y; 630 *dayp = days + 1; /* day in the month */ 631 return; 632 } 633 634 /* 635 * Read/write the hardware clock. 636 */ 637 638 int mac_hwclk(int op, struct rtc_time *t) 639 { 640 unsigned long now; 641 642 if (!op) { /* read */ 643 switch (macintosh_config->adb_type) { 644 case MAC_ADB_II: 645 case MAC_ADB_IOP: 646 now = via_read_time(); 647 break; 648 case MAC_ADB_PB1: 649 case MAC_ADB_PB2: 650 now = pmu_read_time(); 651 break; 652 case MAC_ADB_EGRET: 653 case MAC_ADB_CUDA: 654 now = cuda_read_time(); 655 break; 656 default: 657 now = 0; 658 } 659 660 t->tm_wday = 0; 661 unmktime(now, 0, 662 &t->tm_year, &t->tm_mon, &t->tm_mday, 663 &t->tm_hour, &t->tm_min, &t->tm_sec); 664 #if 0 665 printk("mac_hwclk: read %04d-%02d-%-2d %02d:%02d:%02d\n", 666 t->tm_year + 1900, t->tm_mon + 1, t->tm_mday, 667 t->tm_hour, t->tm_min, t->tm_sec); 668 #endif 669 } else { /* write */ 670 #if 0 671 printk("mac_hwclk: tried to write %04d-%02d-%-2d %02d:%02d:%02d\n", 672 t->tm_year + 1900, t->tm_mon + 1, t->tm_mday, 673 t->tm_hour, t->tm_min, t->tm_sec); 674 #endif 675 676 now = mktime(t->tm_year + 1900, t->tm_mon + 1, t->tm_mday, 677 t->tm_hour, t->tm_min, t->tm_sec); 678 679 switch (macintosh_config->adb_type) { 680 case MAC_ADB_II: 681 case MAC_ADB_IOP: 682 via_write_time(now); 683 break; 684 case MAC_ADB_EGRET: 685 case MAC_ADB_CUDA: 686 cuda_write_time(now); 687 break; 688 case MAC_ADB_PB1: 689 case MAC_ADB_PB2: 690 pmu_write_time(now); 691 break; 692 } 693 } 694 return 0; 695 } 696 697 /* 698 * Set minutes/seconds in the hardware clock 699 */ 700 701 int mac_set_clock_mmss (unsigned long nowtime) 702 { 703 struct rtc_time now; 704 705 mac_hwclk(0, &now); 706 now.tm_sec = nowtime % 60; 707 now.tm_min = (nowtime / 60) % 60; 708 mac_hwclk(1, &now); 709 710 return 0; 711 } 712