1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Miscellaneous Mac68K-specific stuff 4 */ 5 6 #include <linux/types.h> 7 #include <linux/errno.h> 8 #include <linux/kernel.h> 9 #include <linux/delay.h> 10 #include <linux/sched.h> 11 #include <linux/time.h> 12 #include <linux/rtc.h> 13 #include <linux/mm.h> 14 15 #include <linux/adb.h> 16 #include <linux/cuda.h> 17 #include <linux/pmu.h> 18 19 #include <linux/uaccess.h> 20 #include <asm/io.h> 21 #include <asm/segment.h> 22 #include <asm/setup.h> 23 #include <asm/macintosh.h> 24 #include <asm/mac_via.h> 25 #include <asm/mac_oss.h> 26 27 #include <asm/machdep.h> 28 29 /* 30 * Offset between Unix time (1970-based) and Mac time (1904-based). Cuda and PMU 31 * times wrap in 2040. If we need to handle later times, the read_time functions 32 * need to be changed to interpret wrapped times as post-2040. 33 */ 34 35 #define RTC_OFFSET 2082844800 36 37 static void (*rom_reset)(void); 38 39 #ifdef CONFIG_ADB_CUDA 40 static time64_t cuda_read_time(void) 41 { 42 struct adb_request req; 43 time64_t time; 44 45 if (cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_GET_TIME) < 0) 46 return 0; 47 while (!req.complete) 48 cuda_poll(); 49 50 time = (u32)((req.reply[3] << 24) | (req.reply[4] << 16) | 51 (req.reply[5] << 8) | req.reply[6]); 52 53 return time - RTC_OFFSET; 54 } 55 56 static void cuda_write_time(time64_t time) 57 { 58 struct adb_request req; 59 u32 data = lower_32_bits(time + RTC_OFFSET); 60 61 if (cuda_request(&req, NULL, 6, CUDA_PACKET, CUDA_SET_TIME, 62 (data >> 24) & 0xFF, (data >> 16) & 0xFF, 63 (data >> 8) & 0xFF, data & 0xFF) < 0) 64 return; 65 while (!req.complete) 66 cuda_poll(); 67 } 68 69 static __u8 cuda_read_pram(int offset) 70 { 71 struct adb_request req; 72 73 if (cuda_request(&req, NULL, 4, CUDA_PACKET, CUDA_GET_PRAM, 74 (offset >> 8) & 0xFF, offset & 0xFF) < 0) 75 return 0; 76 while (!req.complete) 77 cuda_poll(); 78 return req.reply[3]; 79 } 80 81 static void cuda_write_pram(int offset, __u8 data) 82 { 83 struct adb_request req; 84 85 if (cuda_request(&req, NULL, 5, CUDA_PACKET, CUDA_SET_PRAM, 86 (offset >> 8) & 0xFF, offset & 0xFF, data) < 0) 87 return; 88 while (!req.complete) 89 cuda_poll(); 90 } 91 #endif /* CONFIG_ADB_CUDA */ 92 93 #ifdef CONFIG_ADB_PMU 94 static time64_t pmu_read_time(void) 95 { 96 struct adb_request req; 97 time64_t time; 98 99 if (pmu_request(&req, NULL, 1, PMU_READ_RTC) < 0) 100 return 0; 101 pmu_wait_complete(&req); 102 103 time = (u32)((req.reply[0] << 24) | (req.reply[1] << 16) | 104 (req.reply[2] << 8) | req.reply[3]); 105 106 return time - RTC_OFFSET; 107 } 108 109 static void pmu_write_time(time64_t time) 110 { 111 struct adb_request req; 112 u32 data = lower_32_bits(time + RTC_OFFSET); 113 114 if (pmu_request(&req, NULL, 5, PMU_SET_RTC, 115 (data >> 24) & 0xFF, (data >> 16) & 0xFF, 116 (data >> 8) & 0xFF, data & 0xFF) < 0) 117 return; 118 pmu_wait_complete(&req); 119 } 120 121 static __u8 pmu_read_pram(int offset) 122 { 123 struct adb_request req; 124 125 if (pmu_request(&req, NULL, 3, PMU_READ_NVRAM, 126 (offset >> 8) & 0xFF, offset & 0xFF) < 0) 127 return 0; 128 while (!req.complete) 129 pmu_poll(); 130 return req.reply[3]; 131 } 132 133 static void pmu_write_pram(int offset, __u8 data) 134 { 135 struct adb_request req; 136 137 if (pmu_request(&req, NULL, 4, PMU_WRITE_NVRAM, 138 (offset >> 8) & 0xFF, offset & 0xFF, data) < 0) 139 return; 140 while (!req.complete) 141 pmu_poll(); 142 } 143 #endif /* CONFIG_ADB_PMU */ 144 145 /* 146 * VIA PRAM/RTC access routines 147 * 148 * Must be called with interrupts disabled and 149 * the RTC should be enabled. 150 */ 151 152 static __u8 via_pram_readbyte(void) 153 { 154 int i, reg; 155 __u8 data; 156 157 reg = via1[vBufB] & ~VIA1B_vRTCClk; 158 159 /* Set the RTC data line to be an input. */ 160 161 via1[vDirB] &= ~VIA1B_vRTCData; 162 163 /* The bits of the byte come out in MSB order */ 164 165 data = 0; 166 for (i = 0 ; i < 8 ; i++) { 167 via1[vBufB] = reg; 168 via1[vBufB] = reg | VIA1B_vRTCClk; 169 data = (data << 1) | (via1[vBufB] & VIA1B_vRTCData); 170 } 171 172 /* Return RTC data line to output state */ 173 174 via1[vDirB] |= VIA1B_vRTCData; 175 176 return data; 177 } 178 179 static void via_pram_writebyte(__u8 data) 180 { 181 int i, reg, bit; 182 183 reg = via1[vBufB] & ~(VIA1B_vRTCClk | VIA1B_vRTCData); 184 185 /* The bits of the byte go in in MSB order */ 186 187 for (i = 0 ; i < 8 ; i++) { 188 bit = data & 0x80? 1 : 0; 189 data <<= 1; 190 via1[vBufB] = reg | bit; 191 via1[vBufB] = reg | bit | VIA1B_vRTCClk; 192 } 193 } 194 195 /* 196 * Execute a VIA PRAM/RTC command. For read commands 197 * data should point to a one-byte buffer for the 198 * resulting data. For write commands it should point 199 * to the data byte to for the command. 200 * 201 * This function disables all interrupts while running. 202 */ 203 204 static void via_pram_command(int command, __u8 *data) 205 { 206 unsigned long flags; 207 int is_read; 208 209 local_irq_save(flags); 210 211 /* Enable the RTC and make sure the strobe line is high */ 212 213 via1[vBufB] = (via1[vBufB] | VIA1B_vRTCClk) & ~VIA1B_vRTCEnb; 214 215 if (command & 0xFF00) { /* extended (two-byte) command */ 216 via_pram_writebyte((command & 0xFF00) >> 8); 217 via_pram_writebyte(command & 0xFF); 218 is_read = command & 0x8000; 219 } else { /* one-byte command */ 220 via_pram_writebyte(command); 221 is_read = command & 0x80; 222 } 223 if (is_read) { 224 *data = via_pram_readbyte(); 225 } else { 226 via_pram_writebyte(*data); 227 } 228 229 /* All done, disable the RTC */ 230 231 via1[vBufB] |= VIA1B_vRTCEnb; 232 233 local_irq_restore(flags); 234 } 235 236 static __u8 via_read_pram(int offset) 237 { 238 return 0; 239 } 240 241 static void via_write_pram(int offset, __u8 data) 242 { 243 } 244 245 /* 246 * Return the current time in seconds since January 1, 1904. 247 * 248 * This only works on machines with the VIA-based PRAM/RTC, which 249 * is basically any machine with Mac II-style ADB. 250 */ 251 252 static time64_t via_read_time(void) 253 { 254 union { 255 __u8 cdata[4]; 256 __u32 idata; 257 } result, last_result; 258 int count = 1; 259 260 via_pram_command(0x81, &last_result.cdata[3]); 261 via_pram_command(0x85, &last_result.cdata[2]); 262 via_pram_command(0x89, &last_result.cdata[1]); 263 via_pram_command(0x8D, &last_result.cdata[0]); 264 265 /* 266 * The NetBSD guys say to loop until you get the same reading 267 * twice in a row. 268 */ 269 270 while (1) { 271 via_pram_command(0x81, &result.cdata[3]); 272 via_pram_command(0x85, &result.cdata[2]); 273 via_pram_command(0x89, &result.cdata[1]); 274 via_pram_command(0x8D, &result.cdata[0]); 275 276 if (result.idata == last_result.idata) 277 return (time64_t)result.idata - RTC_OFFSET; 278 279 if (++count > 10) 280 break; 281 282 last_result.idata = result.idata; 283 } 284 285 pr_err("%s: failed to read a stable value; got 0x%08x then 0x%08x\n", 286 __func__, 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(time64_t time) 299 { 300 union { 301 __u8 cdata[4]; 302 __u32 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 = lower_32_bits(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 static void oss_shutdown(void) 337 { 338 oss->rom_ctrl = OSS_POWEROFF; 339 } 340 341 #ifdef CONFIG_ADB_CUDA 342 static void cuda_restart(void) 343 { 344 struct adb_request req; 345 346 if (cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_RESET_SYSTEM) < 0) 347 return; 348 while (!req.complete) 349 cuda_poll(); 350 } 351 352 static void cuda_shutdown(void) 353 { 354 struct adb_request req; 355 356 if (cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_POWERDOWN) < 0) 357 return; 358 359 /* Avoid infinite polling loop when PSU is not under Cuda control */ 360 switch (macintosh_config->ident) { 361 case MAC_MODEL_C660: 362 case MAC_MODEL_Q605: 363 case MAC_MODEL_Q605_ACC: 364 case MAC_MODEL_P475: 365 case MAC_MODEL_P475F: 366 return; 367 } 368 369 while (!req.complete) 370 cuda_poll(); 371 } 372 #endif /* CONFIG_ADB_CUDA */ 373 374 /* 375 *------------------------------------------------------------------- 376 * Below this point are the generic routines; they'll dispatch to the 377 * correct routine for the hardware on which we're running. 378 *------------------------------------------------------------------- 379 */ 380 381 void mac_pram_read(int offset, __u8 *buffer, int len) 382 { 383 __u8 (*func)(int); 384 int i; 385 386 switch (macintosh_config->adb_type) { 387 case MAC_ADB_IOP: 388 case MAC_ADB_II: 389 case MAC_ADB_PB1: 390 func = via_read_pram; 391 break; 392 #ifdef CONFIG_ADB_CUDA 393 case MAC_ADB_EGRET: 394 case MAC_ADB_CUDA: 395 func = cuda_read_pram; 396 break; 397 #endif 398 #ifdef CONFIG_ADB_PMU 399 case MAC_ADB_PB2: 400 func = pmu_read_pram; 401 break; 402 #endif 403 default: 404 return; 405 } 406 for (i = 0 ; i < len ; i++) { 407 buffer[i] = (*func)(offset++); 408 } 409 } 410 411 void mac_pram_write(int offset, __u8 *buffer, int len) 412 { 413 void (*func)(int, __u8); 414 int i; 415 416 switch (macintosh_config->adb_type) { 417 case MAC_ADB_IOP: 418 case MAC_ADB_II: 419 case MAC_ADB_PB1: 420 func = via_write_pram; 421 break; 422 #ifdef CONFIG_ADB_CUDA 423 case MAC_ADB_EGRET: 424 case MAC_ADB_CUDA: 425 func = cuda_write_pram; 426 break; 427 #endif 428 #ifdef CONFIG_ADB_PMU 429 case MAC_ADB_PB2: 430 func = pmu_write_pram; 431 break; 432 #endif 433 default: 434 return; 435 } 436 for (i = 0 ; i < len ; i++) { 437 (*func)(offset++, buffer[i]); 438 } 439 } 440 441 void mac_poweroff(void) 442 { 443 if (oss_present) { 444 oss_shutdown(); 445 } else if (macintosh_config->adb_type == MAC_ADB_II) { 446 via_shutdown(); 447 #ifdef CONFIG_ADB_CUDA 448 } else if (macintosh_config->adb_type == MAC_ADB_EGRET || 449 macintosh_config->adb_type == MAC_ADB_CUDA) { 450 cuda_shutdown(); 451 #endif 452 #ifdef CONFIG_ADB_PMU 453 } else if (macintosh_config->adb_type == MAC_ADB_PB2) { 454 pmu_shutdown(); 455 #endif 456 } 457 458 pr_crit("It is now safe to turn off your Macintosh.\n"); 459 local_irq_disable(); 460 while(1); 461 } 462 463 void mac_reset(void) 464 { 465 if (macintosh_config->adb_type == MAC_ADB_II) { 466 unsigned long flags; 467 468 /* need ROMBASE in booter */ 469 /* indeed, plus need to MAP THE ROM !! */ 470 471 if (mac_bi_data.rombase == 0) 472 mac_bi_data.rombase = 0x40800000; 473 474 /* works on some */ 475 rom_reset = (void *) (mac_bi_data.rombase + 0xa); 476 477 if (macintosh_config->ident == MAC_MODEL_SE30) { 478 /* 479 * MSch: Machines known to crash on ROM reset ... 480 */ 481 } else { 482 local_irq_save(flags); 483 484 rom_reset(); 485 486 local_irq_restore(flags); 487 } 488 #ifdef CONFIG_ADB_CUDA 489 } else if (macintosh_config->adb_type == MAC_ADB_EGRET || 490 macintosh_config->adb_type == MAC_ADB_CUDA) { 491 cuda_restart(); 492 #endif 493 #ifdef CONFIG_ADB_PMU 494 } else if (macintosh_config->adb_type == MAC_ADB_PB2) { 495 pmu_restart(); 496 #endif 497 } else if (CPU_IS_030) { 498 499 /* 030-specific reset routine. The idea is general, but the 500 * specific registers to reset are '030-specific. Until I 501 * have a non-030 machine, I can't test anything else. 502 * -- C. Scott Ananian <cananian@alumni.princeton.edu> 503 */ 504 505 unsigned long rombase = 0x40000000; 506 507 /* make a 1-to-1 mapping, using the transparent tran. reg. */ 508 unsigned long virt = (unsigned long) mac_reset; 509 unsigned long phys = virt_to_phys(mac_reset); 510 unsigned long addr = (phys&0xFF000000)|0x8777; 511 unsigned long offset = phys-virt; 512 513 local_irq_disable(); /* lets not screw this up, ok? */ 514 __asm__ __volatile__(".chip 68030\n\t" 515 "pmove %0,%/tt0\n\t" 516 ".chip 68k" 517 : : "m" (addr)); 518 /* Now jump to physical address so we can disable MMU */ 519 __asm__ __volatile__( 520 ".chip 68030\n\t" 521 "lea %/pc@(1f),%/a0\n\t" 522 "addl %0,%/a0\n\t"/* fixup target address and stack ptr */ 523 "addl %0,%/sp\n\t" 524 "pflusha\n\t" 525 "jmp %/a0@\n\t" /* jump into physical memory */ 526 "0:.long 0\n\t" /* a constant zero. */ 527 /* OK. Now reset everything and jump to reset vector. */ 528 "1:\n\t" 529 "lea %/pc@(0b),%/a0\n\t" 530 "pmove %/a0@, %/tc\n\t" /* disable mmu */ 531 "pmove %/a0@, %/tt0\n\t" /* disable tt0 */ 532 "pmove %/a0@, %/tt1\n\t" /* disable tt1 */ 533 "movel #0, %/a0\n\t" 534 "movec %/a0, %/vbr\n\t" /* clear vector base register */ 535 "movec %/a0, %/cacr\n\t" /* disable caches */ 536 "movel #0x0808,%/a0\n\t" 537 "movec %/a0, %/cacr\n\t" /* flush i&d caches */ 538 "movew #0x2700,%/sr\n\t" /* set up status register */ 539 "movel %1@(0x0),%/a0\n\t"/* load interrupt stack pointer */ 540 "movec %/a0, %/isp\n\t" 541 "movel %1@(0x4),%/a0\n\t" /* load reset vector */ 542 "reset\n\t" /* reset external devices */ 543 "jmp %/a0@\n\t" /* jump to the reset vector */ 544 ".chip 68k" 545 : : "r" (offset), "a" (rombase) : "a0"); 546 } 547 548 /* should never get here */ 549 pr_crit("Restart failed. Please restart manually.\n"); 550 local_irq_disable(); 551 while(1); 552 } 553 554 /* 555 * This function translates seconds since 1970 into a proper date. 556 * 557 * Algorithm cribbed from glibc2.1, __offtime(). 558 * 559 * This is roughly same as rtc_time64_to_tm(), which we should probably 560 * use here, but it's only available when CONFIG_RTC_LIB is enabled. 561 */ 562 #define SECS_PER_MINUTE (60) 563 #define SECS_PER_HOUR (SECS_PER_MINUTE * 60) 564 #define SECS_PER_DAY (SECS_PER_HOUR * 24) 565 566 static void unmktime(time64_t time, long offset, 567 int *yearp, int *monp, int *dayp, 568 int *hourp, int *minp, int *secp) 569 { 570 /* How many days come before each month (0-12). */ 571 static const unsigned short int __mon_yday[2][13] = 572 { 573 /* Normal years. */ 574 { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 }, 575 /* Leap years. */ 576 { 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 } 577 }; 578 int days, rem, y, wday, yday; 579 const unsigned short int *ip; 580 581 days = div_u64_rem(time, SECS_PER_DAY, &rem); 582 rem += offset; 583 while (rem < 0) { 584 rem += SECS_PER_DAY; 585 --days; 586 } 587 while (rem >= SECS_PER_DAY) { 588 rem -= SECS_PER_DAY; 589 ++days; 590 } 591 *hourp = rem / SECS_PER_HOUR; 592 rem %= SECS_PER_HOUR; 593 *minp = rem / SECS_PER_MINUTE; 594 *secp = rem % SECS_PER_MINUTE; 595 /* January 1, 1970 was a Thursday. */ 596 wday = (4 + days) % 7; /* Day in the week. Not currently used */ 597 if (wday < 0) wday += 7; 598 y = 1970; 599 600 #define DIV(a, b) ((a) / (b) - ((a) % (b) < 0)) 601 #define LEAPS_THRU_END_OF(y) (DIV (y, 4) - DIV (y, 100) + DIV (y, 400)) 602 #define __isleap(year) \ 603 ((year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0)) 604 605 while (days < 0 || days >= (__isleap (y) ? 366 : 365)) 606 { 607 /* Guess a corrected year, assuming 365 days per year. */ 608 long int yg = y + days / 365 - (days % 365 < 0); 609 610 /* Adjust DAYS and Y to match the guessed year. */ 611 days -= (yg - y) * 365 + 612 LEAPS_THRU_END_OF(yg - 1) - LEAPS_THRU_END_OF(y - 1); 613 y = yg; 614 } 615 *yearp = y - 1900; 616 yday = days; /* day in the year. Not currently used. */ 617 ip = __mon_yday[__isleap(y)]; 618 for (y = 11; days < (long int) ip[y]; --y) 619 continue; 620 days -= ip[y]; 621 *monp = y; 622 *dayp = days + 1; /* day in the month */ 623 return; 624 } 625 626 /* 627 * Read/write the hardware clock. 628 */ 629 630 int mac_hwclk(int op, struct rtc_time *t) 631 { 632 time64_t now; 633 634 if (!op) { /* read */ 635 switch (macintosh_config->adb_type) { 636 case MAC_ADB_IOP: 637 case MAC_ADB_II: 638 case MAC_ADB_PB1: 639 now = via_read_time(); 640 break; 641 #ifdef CONFIG_ADB_CUDA 642 case MAC_ADB_EGRET: 643 case MAC_ADB_CUDA: 644 now = cuda_read_time(); 645 break; 646 #endif 647 #ifdef CONFIG_ADB_PMU 648 case MAC_ADB_PB2: 649 now = pmu_read_time(); 650 break; 651 #endif 652 default: 653 now = 0; 654 } 655 656 t->tm_wday = 0; 657 unmktime(now, 0, 658 &t->tm_year, &t->tm_mon, &t->tm_mday, 659 &t->tm_hour, &t->tm_min, &t->tm_sec); 660 pr_debug("%s: read %04d-%02d-%-2d %02d:%02d:%02d\n", 661 __func__, t->tm_year + 1900, t->tm_mon + 1, t->tm_mday, 662 t->tm_hour, t->tm_min, t->tm_sec); 663 } else { /* write */ 664 pr_debug("%s: tried to write %04d-%02d-%-2d %02d:%02d:%02d\n", 665 __func__, t->tm_year + 1900, t->tm_mon + 1, t->tm_mday, 666 t->tm_hour, t->tm_min, t->tm_sec); 667 668 now = mktime64(t->tm_year + 1900, t->tm_mon + 1, t->tm_mday, 669 t->tm_hour, t->tm_min, t->tm_sec); 670 671 switch (macintosh_config->adb_type) { 672 case MAC_ADB_IOP: 673 case MAC_ADB_II: 674 case MAC_ADB_PB1: 675 via_write_time(now); 676 break; 677 #ifdef CONFIG_ADB_CUDA 678 case MAC_ADB_EGRET: 679 case MAC_ADB_CUDA: 680 cuda_write_time(now); 681 break; 682 #endif 683 #ifdef CONFIG_ADB_PMU 684 case MAC_ADB_PB2: 685 pmu_write_time(now); 686 break; 687 #endif 688 default: 689 return -ENODEV; 690 } 691 } 692 return 0; 693 } 694