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 #if IS_ENABLED(CONFIG_NVRAM) 40 #ifdef CONFIG_ADB_CUDA 41 static unsigned char cuda_pram_read_byte(int offset) 42 { 43 struct adb_request req; 44 45 if (cuda_request(&req, NULL, 4, CUDA_PACKET, CUDA_GET_PRAM, 46 (offset >> 8) & 0xFF, offset & 0xFF) < 0) 47 return 0; 48 while (!req.complete) 49 cuda_poll(); 50 return req.reply[3]; 51 } 52 53 static void cuda_pram_write_byte(unsigned char data, int offset) 54 { 55 struct adb_request req; 56 57 if (cuda_request(&req, NULL, 5, CUDA_PACKET, CUDA_SET_PRAM, 58 (offset >> 8) & 0xFF, offset & 0xFF, data) < 0) 59 return; 60 while (!req.complete) 61 cuda_poll(); 62 } 63 #endif /* CONFIG_ADB_CUDA */ 64 65 #ifdef CONFIG_ADB_PMU 66 static unsigned char pmu_pram_read_byte(int offset) 67 { 68 struct adb_request req; 69 70 if (pmu_request(&req, NULL, 3, PMU_READ_XPRAM, 71 offset & 0xFF, 1) < 0) 72 return 0; 73 pmu_wait_complete(&req); 74 75 return req.reply[0]; 76 } 77 78 static void pmu_pram_write_byte(unsigned char data, int offset) 79 { 80 struct adb_request req; 81 82 if (pmu_request(&req, NULL, 4, PMU_WRITE_XPRAM, 83 offset & 0xFF, 1, data) < 0) 84 return; 85 pmu_wait_complete(&req); 86 } 87 #endif /* CONFIG_ADB_PMU */ 88 #endif /* CONFIG_NVRAM */ 89 90 /* 91 * VIA PRAM/RTC access routines 92 * 93 * Must be called with interrupts disabled and 94 * the RTC should be enabled. 95 */ 96 97 static __u8 via_rtc_recv(void) 98 { 99 int i, reg; 100 __u8 data; 101 102 reg = via1[vBufB] & ~VIA1B_vRTCClk; 103 104 /* Set the RTC data line to be an input. */ 105 106 via1[vDirB] &= ~VIA1B_vRTCData; 107 108 /* The bits of the byte come out in MSB order */ 109 110 data = 0; 111 for (i = 0 ; i < 8 ; i++) { 112 via1[vBufB] = reg; 113 via1[vBufB] = reg | VIA1B_vRTCClk; 114 data = (data << 1) | (via1[vBufB] & VIA1B_vRTCData); 115 } 116 117 /* Return RTC data line to output state */ 118 119 via1[vDirB] |= VIA1B_vRTCData; 120 121 return data; 122 } 123 124 static void via_rtc_send(__u8 data) 125 { 126 int i, reg, bit; 127 128 reg = via1[vBufB] & ~(VIA1B_vRTCClk | VIA1B_vRTCData); 129 130 /* The bits of the byte go in in MSB order */ 131 132 for (i = 0 ; i < 8 ; i++) { 133 bit = data & 0x80? 1 : 0; 134 data <<= 1; 135 via1[vBufB] = reg | bit; 136 via1[vBufB] = reg | bit | VIA1B_vRTCClk; 137 } 138 } 139 140 /* 141 * These values can be found in Inside Macintosh vol. III ch. 2 142 * which has a description of the RTC chip in the original Mac. 143 */ 144 145 #define RTC_FLG_READ BIT(7) 146 #define RTC_FLG_WRITE_PROTECT BIT(7) 147 #define RTC_CMD_READ(r) (RTC_FLG_READ | (r << 2)) 148 #define RTC_CMD_WRITE(r) (r << 2) 149 #define RTC_REG_SECONDS_0 0 150 #define RTC_REG_SECONDS_1 1 151 #define RTC_REG_SECONDS_2 2 152 #define RTC_REG_SECONDS_3 3 153 #define RTC_REG_WRITE_PROTECT 13 154 155 /* 156 * Inside Mac has no information about two-byte RTC commands but 157 * the MAME/MESS source code has the essentials. 158 */ 159 160 #define RTC_REG_XPRAM 14 161 #define RTC_CMD_XPRAM_READ (RTC_CMD_READ(RTC_REG_XPRAM) << 8) 162 #define RTC_CMD_XPRAM_WRITE (RTC_CMD_WRITE(RTC_REG_XPRAM) << 8) 163 #define RTC_CMD_XPRAM_ARG(a) (((a & 0xE0) << 3) | ((a & 0x1F) << 2)) 164 165 /* 166 * Execute a VIA PRAM/RTC command. For read commands 167 * data should point to a one-byte buffer for the 168 * resulting data. For write commands it should point 169 * to the data byte to for the command. 170 * 171 * This function disables all interrupts while running. 172 */ 173 174 static void via_rtc_command(int command, __u8 *data) 175 { 176 unsigned long flags; 177 int is_read; 178 179 local_irq_save(flags); 180 181 /* The least significant bits must be 0b01 according to Inside Mac */ 182 183 command = (command & ~3) | 1; 184 185 /* Enable the RTC and make sure the strobe line is high */ 186 187 via1[vBufB] = (via1[vBufB] | VIA1B_vRTCClk) & ~VIA1B_vRTCEnb; 188 189 if (command & 0xFF00) { /* extended (two-byte) command */ 190 via_rtc_send((command & 0xFF00) >> 8); 191 via_rtc_send(command & 0xFF); 192 is_read = command & (RTC_FLG_READ << 8); 193 } else { /* one-byte command */ 194 via_rtc_send(command); 195 is_read = command & RTC_FLG_READ; 196 } 197 if (is_read) { 198 *data = via_rtc_recv(); 199 } else { 200 via_rtc_send(*data); 201 } 202 203 /* All done, disable the RTC */ 204 205 via1[vBufB] |= VIA1B_vRTCEnb; 206 207 local_irq_restore(flags); 208 } 209 210 #if IS_ENABLED(CONFIG_NVRAM) 211 static unsigned char via_pram_read_byte(int offset) 212 { 213 unsigned char temp; 214 215 via_rtc_command(RTC_CMD_XPRAM_READ | RTC_CMD_XPRAM_ARG(offset), &temp); 216 217 return temp; 218 } 219 220 static void via_pram_write_byte(unsigned char data, int offset) 221 { 222 unsigned char temp; 223 224 temp = 0x55; 225 via_rtc_command(RTC_CMD_WRITE(RTC_REG_WRITE_PROTECT), &temp); 226 227 temp = data; 228 via_rtc_command(RTC_CMD_XPRAM_WRITE | RTC_CMD_XPRAM_ARG(offset), &temp); 229 230 temp = 0x55 | RTC_FLG_WRITE_PROTECT; 231 via_rtc_command(RTC_CMD_WRITE(RTC_REG_WRITE_PROTECT), &temp); 232 } 233 #endif /* CONFIG_NVRAM */ 234 235 /* 236 * Return the current time in seconds since January 1, 1904. 237 * 238 * This only works on machines with the VIA-based PRAM/RTC, which 239 * is basically any machine with Mac II-style ADB. 240 */ 241 242 static time64_t via_read_time(void) 243 { 244 union { 245 __u8 cdata[4]; 246 __u32 idata; 247 } result, last_result; 248 int count = 1; 249 250 via_rtc_command(RTC_CMD_READ(RTC_REG_SECONDS_0), &last_result.cdata[3]); 251 via_rtc_command(RTC_CMD_READ(RTC_REG_SECONDS_1), &last_result.cdata[2]); 252 via_rtc_command(RTC_CMD_READ(RTC_REG_SECONDS_2), &last_result.cdata[1]); 253 via_rtc_command(RTC_CMD_READ(RTC_REG_SECONDS_3), &last_result.cdata[0]); 254 255 /* 256 * The NetBSD guys say to loop until you get the same reading 257 * twice in a row. 258 */ 259 260 while (1) { 261 via_rtc_command(RTC_CMD_READ(RTC_REG_SECONDS_0), 262 &result.cdata[3]); 263 via_rtc_command(RTC_CMD_READ(RTC_REG_SECONDS_1), 264 &result.cdata[2]); 265 via_rtc_command(RTC_CMD_READ(RTC_REG_SECONDS_2), 266 &result.cdata[1]); 267 via_rtc_command(RTC_CMD_READ(RTC_REG_SECONDS_3), 268 &result.cdata[0]); 269 270 if (result.idata == last_result.idata) 271 return (time64_t)result.idata - RTC_OFFSET; 272 273 if (++count > 10) 274 break; 275 276 last_result.idata = result.idata; 277 } 278 279 pr_err("%s: failed to read a stable value; got 0x%08x then 0x%08x\n", 280 __func__, last_result.idata, result.idata); 281 282 return 0; 283 } 284 285 /* 286 * Set the current time to a number of seconds since January 1, 1904. 287 * 288 * This only works on machines with the VIA-based PRAM/RTC, which 289 * is basically any machine with Mac II-style ADB. 290 */ 291 292 static void via_set_rtc_time(struct rtc_time *tm) 293 { 294 union { 295 __u8 cdata[4]; 296 __u32 idata; 297 } data; 298 __u8 temp; 299 time64_t time; 300 301 time = mktime64(tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday, 302 tm->tm_hour, tm->tm_min, tm->tm_sec); 303 304 /* Clear the write protect bit */ 305 306 temp = 0x55; 307 via_rtc_command(RTC_CMD_WRITE(RTC_REG_WRITE_PROTECT), &temp); 308 309 data.idata = lower_32_bits(time + RTC_OFFSET); 310 via_rtc_command(RTC_CMD_WRITE(RTC_REG_SECONDS_0), &data.cdata[3]); 311 via_rtc_command(RTC_CMD_WRITE(RTC_REG_SECONDS_1), &data.cdata[2]); 312 via_rtc_command(RTC_CMD_WRITE(RTC_REG_SECONDS_2), &data.cdata[1]); 313 via_rtc_command(RTC_CMD_WRITE(RTC_REG_SECONDS_3), &data.cdata[0]); 314 315 /* Set the write protect bit */ 316 317 temp = 0x55 | RTC_FLG_WRITE_PROTECT; 318 via_rtc_command(RTC_CMD_WRITE(RTC_REG_WRITE_PROTECT), &temp); 319 } 320 321 static void via_shutdown(void) 322 { 323 if (rbv_present) { 324 via2[rBufB] &= ~0x04; 325 } else { 326 /* Direction of vDirB is output */ 327 via2[vDirB] |= 0x04; 328 /* Send a value of 0 on that line */ 329 via2[vBufB] &= ~0x04; 330 mdelay(1000); 331 } 332 } 333 334 static void oss_shutdown(void) 335 { 336 oss->rom_ctrl = OSS_POWEROFF; 337 } 338 339 #ifdef CONFIG_ADB_CUDA 340 static void cuda_restart(void) 341 { 342 struct adb_request req; 343 344 if (cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_RESET_SYSTEM) < 0) 345 return; 346 while (!req.complete) 347 cuda_poll(); 348 } 349 350 static void cuda_shutdown(void) 351 { 352 struct adb_request req; 353 354 if (cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_POWERDOWN) < 0) 355 return; 356 357 /* Avoid infinite polling loop when PSU is not under Cuda control */ 358 switch (macintosh_config->ident) { 359 case MAC_MODEL_C660: 360 case MAC_MODEL_Q605: 361 case MAC_MODEL_Q605_ACC: 362 case MAC_MODEL_P475: 363 case MAC_MODEL_P475F: 364 return; 365 } 366 367 while (!req.complete) 368 cuda_poll(); 369 } 370 #endif /* CONFIG_ADB_CUDA */ 371 372 /* 373 *------------------------------------------------------------------- 374 * Below this point are the generic routines; they'll dispatch to the 375 * correct routine for the hardware on which we're running. 376 *------------------------------------------------------------------- 377 */ 378 379 #if IS_ENABLED(CONFIG_NVRAM) 380 unsigned char mac_pram_read_byte(int addr) 381 { 382 switch (macintosh_config->adb_type) { 383 case MAC_ADB_IOP: 384 case MAC_ADB_II: 385 case MAC_ADB_PB1: 386 return via_pram_read_byte(addr); 387 #ifdef CONFIG_ADB_CUDA 388 case MAC_ADB_EGRET: 389 case MAC_ADB_CUDA: 390 return cuda_pram_read_byte(addr); 391 #endif 392 #ifdef CONFIG_ADB_PMU 393 case MAC_ADB_PB2: 394 return pmu_pram_read_byte(addr); 395 #endif 396 default: 397 return 0xFF; 398 } 399 } 400 401 void mac_pram_write_byte(unsigned char val, int addr) 402 { 403 switch (macintosh_config->adb_type) { 404 case MAC_ADB_IOP: 405 case MAC_ADB_II: 406 case MAC_ADB_PB1: 407 via_pram_write_byte(val, addr); 408 break; 409 #ifdef CONFIG_ADB_CUDA 410 case MAC_ADB_EGRET: 411 case MAC_ADB_CUDA: 412 cuda_pram_write_byte(val, addr); 413 break; 414 #endif 415 #ifdef CONFIG_ADB_PMU 416 case MAC_ADB_PB2: 417 pmu_pram_write_byte(val, addr); 418 break; 419 #endif 420 default: 421 break; 422 } 423 } 424 425 ssize_t mac_pram_get_size(void) 426 { 427 return 256; 428 } 429 #endif /* CONFIG_NVRAM */ 430 431 void mac_poweroff(void) 432 { 433 if (oss_present) { 434 oss_shutdown(); 435 } else if (macintosh_config->adb_type == MAC_ADB_II) { 436 via_shutdown(); 437 #ifdef CONFIG_ADB_CUDA 438 } else if (macintosh_config->adb_type == MAC_ADB_EGRET || 439 macintosh_config->adb_type == MAC_ADB_CUDA) { 440 cuda_shutdown(); 441 #endif 442 #ifdef CONFIG_ADB_PMU 443 } else if (macintosh_config->adb_type == MAC_ADB_PB2) { 444 pmu_shutdown(); 445 #endif 446 } 447 448 pr_crit("It is now safe to turn off your Macintosh.\n"); 449 local_irq_disable(); 450 while(1); 451 } 452 453 void mac_reset(void) 454 { 455 if (macintosh_config->adb_type == MAC_ADB_II && 456 macintosh_config->ident != MAC_MODEL_SE30) { 457 /* need ROMBASE in booter */ 458 /* indeed, plus need to MAP THE ROM !! */ 459 460 if (mac_bi_data.rombase == 0) 461 mac_bi_data.rombase = 0x40800000; 462 463 /* works on some */ 464 rom_reset = (void *) (mac_bi_data.rombase + 0xa); 465 466 local_irq_disable(); 467 rom_reset(); 468 #ifdef CONFIG_ADB_CUDA 469 } else if (macintosh_config->adb_type == MAC_ADB_EGRET || 470 macintosh_config->adb_type == MAC_ADB_CUDA) { 471 cuda_restart(); 472 #endif 473 #ifdef CONFIG_ADB_PMU 474 } else if (macintosh_config->adb_type == MAC_ADB_PB2) { 475 pmu_restart(); 476 #endif 477 } else if (CPU_IS_030) { 478 479 /* 030-specific reset routine. The idea is general, but the 480 * specific registers to reset are '030-specific. Until I 481 * have a non-030 machine, I can't test anything else. 482 * -- C. Scott Ananian <cananian@alumni.princeton.edu> 483 */ 484 485 unsigned long rombase = 0x40000000; 486 487 /* make a 1-to-1 mapping, using the transparent tran. reg. */ 488 unsigned long virt = (unsigned long) mac_reset; 489 unsigned long phys = virt_to_phys(mac_reset); 490 unsigned long addr = (phys&0xFF000000)|0x8777; 491 unsigned long offset = phys-virt; 492 493 local_irq_disable(); /* lets not screw this up, ok? */ 494 __asm__ __volatile__(".chip 68030\n\t" 495 "pmove %0,%/tt0\n\t" 496 ".chip 68k" 497 : : "m" (addr)); 498 /* Now jump to physical address so we can disable MMU */ 499 __asm__ __volatile__( 500 ".chip 68030\n\t" 501 "lea %/pc@(1f),%/a0\n\t" 502 "addl %0,%/a0\n\t"/* fixup target address and stack ptr */ 503 "addl %0,%/sp\n\t" 504 "pflusha\n\t" 505 "jmp %/a0@\n\t" /* jump into physical memory */ 506 "0:.long 0\n\t" /* a constant zero. */ 507 /* OK. Now reset everything and jump to reset vector. */ 508 "1:\n\t" 509 "lea %/pc@(0b),%/a0\n\t" 510 "pmove %/a0@, %/tc\n\t" /* disable mmu */ 511 "pmove %/a0@, %/tt0\n\t" /* disable tt0 */ 512 "pmove %/a0@, %/tt1\n\t" /* disable tt1 */ 513 "movel #0, %/a0\n\t" 514 "movec %/a0, %/vbr\n\t" /* clear vector base register */ 515 "movec %/a0, %/cacr\n\t" /* disable caches */ 516 "movel #0x0808,%/a0\n\t" 517 "movec %/a0, %/cacr\n\t" /* flush i&d caches */ 518 "movew #0x2700,%/sr\n\t" /* set up status register */ 519 "movel %1@(0x0),%/a0\n\t"/* load interrupt stack pointer */ 520 "movec %/a0, %/isp\n\t" 521 "movel %1@(0x4),%/a0\n\t" /* load reset vector */ 522 "reset\n\t" /* reset external devices */ 523 "jmp %/a0@\n\t" /* jump to the reset vector */ 524 ".chip 68k" 525 : : "r" (offset), "a" (rombase) : "a0"); 526 } 527 528 /* should never get here */ 529 pr_crit("Restart failed. Please restart manually.\n"); 530 local_irq_disable(); 531 while(1); 532 } 533 534 /* 535 * This function translates seconds since 1970 into a proper date. 536 * 537 * Algorithm cribbed from glibc2.1, __offtime(). 538 * 539 * This is roughly same as rtc_time64_to_tm(), which we should probably 540 * use here, but it's only available when CONFIG_RTC_LIB is enabled. 541 */ 542 #define SECS_PER_MINUTE (60) 543 #define SECS_PER_HOUR (SECS_PER_MINUTE * 60) 544 #define SECS_PER_DAY (SECS_PER_HOUR * 24) 545 546 static void unmktime(time64_t time, long offset, 547 int *yearp, int *monp, int *dayp, 548 int *hourp, int *minp, int *secp) 549 { 550 /* How many days come before each month (0-12). */ 551 static const unsigned short int __mon_yday[2][13] = 552 { 553 /* Normal years. */ 554 { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 }, 555 /* Leap years. */ 556 { 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 } 557 }; 558 int days, rem, y, wday, yday; 559 const unsigned short int *ip; 560 561 days = div_u64_rem(time, SECS_PER_DAY, &rem); 562 rem += offset; 563 while (rem < 0) { 564 rem += SECS_PER_DAY; 565 --days; 566 } 567 while (rem >= SECS_PER_DAY) { 568 rem -= SECS_PER_DAY; 569 ++days; 570 } 571 *hourp = rem / SECS_PER_HOUR; 572 rem %= SECS_PER_HOUR; 573 *minp = rem / SECS_PER_MINUTE; 574 *secp = rem % SECS_PER_MINUTE; 575 /* January 1, 1970 was a Thursday. */ 576 wday = (4 + days) % 7; /* Day in the week. Not currently used */ 577 if (wday < 0) wday += 7; 578 y = 1970; 579 580 #define DIV(a, b) ((a) / (b) - ((a) % (b) < 0)) 581 #define LEAPS_THRU_END_OF(y) (DIV (y, 4) - DIV (y, 100) + DIV (y, 400)) 582 #define __isleap(year) \ 583 ((year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0)) 584 585 while (days < 0 || days >= (__isleap (y) ? 366 : 365)) 586 { 587 /* Guess a corrected year, assuming 365 days per year. */ 588 long int yg = y + days / 365 - (days % 365 < 0); 589 590 /* Adjust DAYS and Y to match the guessed year. */ 591 days -= (yg - y) * 365 + 592 LEAPS_THRU_END_OF(yg - 1) - LEAPS_THRU_END_OF(y - 1); 593 y = yg; 594 } 595 *yearp = y - 1900; 596 yday = days; /* day in the year. Not currently used. */ 597 ip = __mon_yday[__isleap(y)]; 598 for (y = 11; days < (long int) ip[y]; --y) 599 continue; 600 days -= ip[y]; 601 *monp = y; 602 *dayp = days + 1; /* day in the month */ 603 return; 604 } 605 606 /* 607 * Read/write the hardware clock. 608 */ 609 610 int mac_hwclk(int op, struct rtc_time *t) 611 { 612 time64_t now; 613 614 if (!op) { /* read */ 615 switch (macintosh_config->adb_type) { 616 case MAC_ADB_IOP: 617 case MAC_ADB_II: 618 case MAC_ADB_PB1: 619 now = via_read_time(); 620 break; 621 #ifdef CONFIG_ADB_CUDA 622 case MAC_ADB_EGRET: 623 case MAC_ADB_CUDA: 624 now = cuda_get_time(); 625 break; 626 #endif 627 #ifdef CONFIG_ADB_PMU 628 case MAC_ADB_PB2: 629 now = pmu_get_time(); 630 break; 631 #endif 632 default: 633 now = 0; 634 } 635 636 t->tm_wday = 0; 637 unmktime(now, 0, 638 &t->tm_year, &t->tm_mon, &t->tm_mday, 639 &t->tm_hour, &t->tm_min, &t->tm_sec); 640 pr_debug("%s: read %ptR\n", __func__, t); 641 } else { /* write */ 642 pr_debug("%s: tried to write %ptR\n", __func__, t); 643 644 switch (macintosh_config->adb_type) { 645 case MAC_ADB_IOP: 646 case MAC_ADB_II: 647 case MAC_ADB_PB1: 648 via_set_rtc_time(t); 649 break; 650 #ifdef CONFIG_ADB_CUDA 651 case MAC_ADB_EGRET: 652 case MAC_ADB_CUDA: 653 cuda_set_rtc_time(t); 654 break; 655 #endif 656 #ifdef CONFIG_ADB_PMU 657 case MAC_ADB_PB2: 658 pmu_set_rtc_time(t); 659 break; 660 #endif 661 default: 662 return -ENODEV; 663 } 664 } 665 return 0; 666 } 667