arch/m68k/mac/misc.c

   1 /*
   2  * Miscellaneous Mac68K-specific stuff
   3  */
   4
   5 #include <linux/config.h>
   6 #include <linux/types.h>
   7 #include <linux/errno.h>
   8 #include <linux/miscdevice.h>
   9 #include <linux/kernel.h>
  10 #include <linux/delay.h>
  11 #include <linux/sched.h>
  12 #include <linux/slab.h>
  13 #include <linux/time.h>
  14 #include <linux/rtc.h>
  15 #include <linux/mm.h>
  16
  17 #include <linux/adb.h>
  18 #include <linux/cuda.h>
  19 #include <linux/pmu.h>
  20
  21 #include <asm/uaccess.h>
  22 #include <asm/io.h>
  23 #include <asm/rtc.h>
  24 #include <asm/system.h>
  25 #include <asm/segment.h>
  26 #include <asm/setup.h>
  27 #include <asm/macintosh.h>
  28 #include <asm/mac_via.h>
  29 #include <asm/mac_oss.h>
  30
  31 #define BOOTINFO_COMPAT_1_0
  32 #include <asm/bootinfo.h>
  33 #include <asm/machdep.h>
  34
  35 /* Offset between Unix time (1970-based) and Mac time (1904-based) */
  36
  37 #define RTC_OFFSET 2082844800
  38
  39 extern struct mac_booter_data mac_bi_data;
  40 static void (*rom_reset)(void);
  41
  42 #ifdef CONFIG_ADB
  43 /*
  44  * Return the current time as the number of seconds since January 1, 1904.
  45  */
  46
  47 static long adb_read_time(void)
  48 {
  49         volatile struct adb_request req;
  50         long time;
  51
  52         adb_request((struct adb_request *) &req, NULL,
  53                         ADBREQ_RAW|ADBREQ_SYNC,
  54                         2, CUDA_PACKET, CUDA_GET_TIME);
  55
  56         time = (req.reply[3] << 24) | (req.reply[4] << 16)
  57                 | (req.reply[5] << 8) | req.reply[6];
  58         return time - RTC_OFFSET;
  59 }
  60
  61 /*
  62  * Set the current system time
  63  */
  64
  65 static void adb_write_time(long data)
  66 {
  67         volatile struct adb_request req;
  68
  69         data += RTC_OFFSET;
  70
  71         adb_request((struct adb_request *) &req, NULL,
  72                         ADBREQ_RAW|ADBREQ_SYNC,
  73                         6, CUDA_PACKET, CUDA_SET_TIME,
  74                         (data >> 24) & 0xFF, (data >> 16) & 0xFF,
  75                         (data >> 8) & 0xFF, data & 0xFF);
  76 }
  77
  78 /*
  79  * Get a byte from the NVRAM
  80  */
  81
  82 static __u8 adb_read_pram(int offset)
  83 {
  84         volatile struct adb_request req;
  85
  86         adb_request((struct adb_request *) &req, NULL,
  87                         ADBREQ_RAW|ADBREQ_SYNC,
  88                         4, CUDA_PACKET, CUDA_GET_PRAM,
  89                         (offset >> 8) & 0xFF, offset & 0xFF);
  90         return req.reply[3];
  91 }
  92
  93 /*
  94  * Write a byte to the NVRAM
  95  */
  96
  97 static void adb_write_pram(int offset, __u8 data)
  98 {
  99         volatile struct adb_request req;
 100
 101         adb_request((struct adb_request *) &req, NULL,
 102                         ADBREQ_RAW|ADBREQ_SYNC,
 103                         5, CUDA_PACKET, CUDA_SET_PRAM,
 104                         (offset >> 8) & 0xFF, offset & 0xFF,
 105                         data);
 106 }
 107 #endif /* CONFIG_ADB */
 108
 109 /*
 110  * VIA PRAM/RTC access routines
 111  *
 112  * Must be called with interrupts disabled and
 113  * the RTC should be enabled.
 114  */
 115
 116 static __u8 via_pram_readbyte(void)
 117 {
 118         int     i,reg;
 119         __u8    data;
 120
 121         reg = via1[vBufB] & ~VIA1B_vRTCClk;
 122
 123         /* Set the RTC data line to be an input. */
 124
 125         via1[vDirB] &= ~VIA1B_vRTCData;
 126
 127         /* The bits of the byte come out in MSB order */
 128
 129         data = 0;
 130         for (i = 0 ; i < 8 ; i++) {
 131                 via1[vBufB] = reg;
 132                 via1[vBufB] = reg | VIA1B_vRTCClk;
 133                 data = (data << 1) | (via1[vBufB] & VIA1B_vRTCData);
 134         }
 135
 136         /* Return RTC data line to output state */
 137
 138         via1[vDirB] |= VIA1B_vRTCData;
 139
 140         return data;
 141 }
 142
 143 static void via_pram_writebyte(__u8 data)
 144 {
 145         int     i,reg,bit;
 146
 147         reg = via1[vBufB] & ~(VIA1B_vRTCClk | VIA1B_vRTCData);
 148
 149         /* The bits of the byte go in in MSB order */
 150
 151         for (i = 0 ; i < 8 ; i++) {
 152                 bit = data & 0x80? 1 : 0;
 153                 data <<= 1;
 154                 via1[vBufB] = reg | bit;
 155                 via1[vBufB] = reg | bit | VIA1B_vRTCClk;
 156         }
 157 }
 158
 159 /*
 160  * Execute a VIA PRAM/RTC command. For read commands
 161  * data should point to a one-byte buffer for the
 162  * resulting data. For write commands it should point
 163  * to the data byte to for the command.
 164  *
 165  * This function disables all interrupts while running.
 166  */
 167
 168 static void via_pram_command(int command, __u8 *data)
 169 {
 170         unsigned long flags;
 171         int     is_read;
 172
 173         local_irq_save(flags);
 174
 175         /* Enable the RTC and make sure the strobe line is high */
 176
 177         via1[vBufB] = (via1[vBufB] | VIA1B_vRTCClk) & ~VIA1B_vRTCEnb;
 178
 179         if (command & 0xFF00) {         /* extended (two-byte) command */
 180                 via_pram_writebyte((command & 0xFF00) >> 8);
 181                 via_pram_writebyte(command & 0xFF);
 182                 is_read = command & 0x8000;
 183         } else {                        /* one-byte command */
 184                 via_pram_writebyte(command);
 185                 is_read = command & 0x80;
 186         }
 187         if (is_read) {
 188                 *data = via_pram_readbyte();
 189         } else {
 190                 via_pram_writebyte(*data);
 191         }
 192
 193         /* All done, disable the RTC */
 194
 195         via1[vBufB] |= VIA1B_vRTCEnb;
 196
 197         local_irq_restore(flags);
 198 }
 199
 200 static __u8 via_read_pram(int offset)
 201 {
 202         return 0;
 203 }
 204
 205 static void via_write_pram(int offset, __u8 data)
 206 {
 207 }
 208
 209 /*
 210  * Return the current time in seconds since January 1, 1904.
 211  *
 212  * This only works on machines with the VIA-based PRAM/RTC, which
 213  * is basically any machine with Mac II-style ADB.
 214  */
 215
 216 static long via_read_time(void)
 217 {
 218         union {
 219                 __u8  cdata[4];
 220                 long  idata;
 221         } result, last_result;
 222         int     ct;
 223
 224         /*
 225          * The NetBSD guys say to loop until you get the same reading
 226          * twice in a row.
 227          */
 228
 229         ct = 0;
 230         do {
 231                 if (++ct > 10) {
 232                         printk("via_read_time: couldn't get valid time, "
 233                                "last read = 0x%08lx and 0x%08lx\n",
 234                                last_result.idata, result.idata);
 235                         break;
 236                 }
 237
 238                 last_result.idata = result.idata;
 239                 result.idata = 0;
 240
 241                 via_pram_command(0x81, &result.cdata[3]);
 242                 via_pram_command(0x85, &result.cdata[2]);
 243                 via_pram_command(0x89, &result.cdata[1]);
 244                 via_pram_command(0x8D, &result.cdata[0]);
 245         } while (result.idata != last_result.idata);
 246
 247         return result.idata - RTC_OFFSET;
 248 }
 249
 250 /*
 251  * Set the current time to a number of seconds since January 1, 1904.
 252  *
 253  * This only works on machines with the VIA-based PRAM/RTC, which
 254  * is basically any machine with Mac II-style ADB.
 255  */
 256
 257 static void via_write_time(long time)
 258 {
 259         union {
 260                 __u8  cdata[4];
 261                 long  idata;
 262         } data;
 263         __u8    temp;
 264
 265         /* Clear the write protect bit */
 266
 267         temp = 0x55;
 268         via_pram_command(0x35, &temp);
 269
 270         data.idata = time + RTC_OFFSET;
 271         via_pram_command(0x01, &data.cdata[3]);
 272         via_pram_command(0x05, &data.cdata[2]);
 273         via_pram_command(0x09, &data.cdata[1]);
 274         via_pram_command(0x0D, &data.cdata[0]);
 275
 276         /* Set the write protect bit */
 277
 278         temp = 0xD5;
 279         via_pram_command(0x35, &temp);
 280 }
 281
 282 static void via_shutdown(void)
 283 {
 284         if (rbv_present) {
 285                 via2[rBufB] &= ~0x04;
 286         } else {
 287                 /* Direction of vDirB is output */
 288                 via2[vDirB] |= 0x04;
 289                 /* Send a value of 0 on that line */
 290                 via2[vBufB] &= ~0x04;
 291                 mdelay(1000);
 292         }
 293 }
 294
 295 /*
 296  * FIXME: not sure how this is supposed to work exactly...
 297  */
 298
 299 static void oss_shutdown(void)
 300 {
 301         oss->rom_ctrl = OSS_POWEROFF;
 302 }
 303
 304 #ifdef CONFIG_ADB_CUDA
 305
 306 static void cuda_restart(void)
 307 {
 308         adb_request(NULL, NULL, ADBREQ_RAW|ADBREQ_SYNC,
 309                         2, CUDA_PACKET, CUDA_RESET_SYSTEM);
 310 }
 311
 312 static void cuda_shutdown(void)
 313 {
 314         adb_request(NULL, NULL, ADBREQ_RAW|ADBREQ_SYNC,
 315                         2, CUDA_PACKET, CUDA_POWERDOWN);
 316 }
 317
 318 #endif /* CONFIG_ADB_CUDA */
 319
 320 #ifdef CONFIG_ADB_PMU
 321
 322 void pmu_restart(void)
 323 {
 324         adb_request(NULL, NULL, ADBREQ_RAW|ADBREQ_SYNC,
 325                         3, PMU_PACKET, PMU_SET_INTR_MASK,
 326                         PMU_INT_ADB|PMU_INT_TICK);
 327
 328         adb_request(NULL, NULL, ADBREQ_RAW|ADBREQ_SYNC,
 329                         2, PMU_PACKET, PMU_RESET);
 330 }
 331
 332 void pmu_shutdown(void)
 333 {
 334         adb_request(NULL, NULL, ADBREQ_RAW|ADBREQ_SYNC,
 335                         3, PMU_PACKET, PMU_SET_INTR_MASK,
 336                         PMU_INT_ADB|PMU_INT_TICK);
 337
 338         adb_request(NULL, NULL, ADBREQ_RAW|ADBREQ_SYNC,
 339                         6, PMU_PACKET, PMU_SHUTDOWN,
 340                         'M', 'A', 'T', 'T');
 341 }
 342
 343 #endif /* CONFIG_ADB_PMU */
 344
 345 /*
 346  *-------------------------------------------------------------------
 347  * Below this point are the generic routines; they'll dispatch to the
 348  * correct routine for the hardware on which we're running.
 349  *-------------------------------------------------------------------
 350  */
 351
 352 void mac_pram_read(int offset, __u8 *buffer, int len)
 353 {
 354         __u8 (*func)(int) = NULL;
 355         int i;
 356
 357         if (macintosh_config->adb_type == MAC_ADB_IISI ||
 358             macintosh_config->adb_type == MAC_ADB_PB1 ||
 359             macintosh_config->adb_type == MAC_ADB_PB2 ||
 360             macintosh_config->adb_type == MAC_ADB_CUDA) {
 361 #ifdef CONFIG_ADB
 362                 func = adb_read_pram;
 363 #else
 364                 return;
 365 #endif
 366         } else {
 367                 func = via_read_pram;
 368         }
 369         for (i = 0 ; i < len ; i++) {
 370                 buffer[i] = (*func)(offset++);
 371         }
 372 }
 373
 374 void mac_pram_write(int offset, __u8 *buffer, int len)
 375 {
 376         void (*func)(int, __u8) = NULL;
 377         int i;
 378
 379         if (macintosh_config->adb_type == MAC_ADB_IISI ||
 380             macintosh_config->adb_type == MAC_ADB_PB1 ||
 381             macintosh_config->adb_type == MAC_ADB_PB2 ||
 382             macintosh_config->adb_type == MAC_ADB_CUDA) {
 383 #ifdef CONFIG_ADB
 384                 func = adb_write_pram;
 385 #else
 386                 return;
 387 #endif
 388         } else {
 389                 func = via_write_pram;
 390         }
 391         for (i = 0 ; i < len ; i++) {
 392                 (*func)(offset++, buffer[i]);
 393         }
 394 }
 395
 396 void mac_poweroff(void)
 397 {
 398         /*
 399          * MAC_ADB_IISI may need to be moved up here if it doesn't actually
 400          * work using the ADB packet method.  --David Kilzer
 401          */
 402
 403         if (oss_present) {
 404                 oss_shutdown();
 405         } else if (macintosh_config->adb_type == MAC_ADB_II) {
 406                 via_shutdown();
 407 #ifdef CONFIG_ADB_CUDA
 408         } else if (macintosh_config->adb_type == MAC_ADB_CUDA) {
 409                 cuda_shutdown();
 410 #endif
 411 #ifdef CONFIG_ADB_PMU
 412         } else if (macintosh_config->adb_type == MAC_ADB_PB1
 413                 || macintosh_config->adb_type == MAC_ADB_PB2) {
 414                 pmu_shutdown();
 415 #endif
 416         }
 417         local_irq_enable();
 418         printk("It is now safe to turn off your Macintosh.\n");
 419         while(1);
 420 }
 421
 422 void mac_reset(void)
 423 {
 424         if (macintosh_config->adb_type == MAC_ADB_II) {
 425                 unsigned long flags;
 426
 427                 /* need ROMBASE in booter */
 428                 /* indeed, plus need to MAP THE ROM !! */
 429
 430                 if (mac_bi_data.rombase == 0)
 431                         mac_bi_data.rombase = 0x40800000;
 432
 433                 /* works on some */
 434                 rom_reset = (void *) (mac_bi_data.rombase + 0xa);
 435
 436                 if (macintosh_config->ident == MAC_MODEL_SE30) {
 437                         /*
 438                          * MSch: Machines known to crash on ROM reset ...
 439                          */
 440                 } else {
 441                         local_irq_save(flags);
 442
 443                         rom_reset();
 444
 445                         local_irq_restore(flags);
 446                 }
 447 #ifdef CONFIG_ADB_CUDA
 448         } else if (macintosh_config->adb_type == MAC_ADB_CUDA) {
 449                 cuda_restart();
 450 #endif
 451 #ifdef CONFIG_ADB_PMU
 452         } else if (macintosh_config->adb_type == MAC_ADB_PB1
 453                 || macintosh_config->adb_type == MAC_ADB_PB2) {
 454                 pmu_restart();
 455 #endif
 456         } else if (CPU_IS_030) {
 457
 458                 /* 030-specific reset routine.  The idea is general, but the
 459                  * specific registers to reset are '030-specific.  Until I
 460                  * have a non-030 machine, I can't test anything else.
 461                  *  -- C. Scott Ananian <cananian@alumni.princeton.edu>
 462                  */
 463
 464                 unsigned long rombase = 0x40000000;
 465
 466                 /* make a 1-to-1 mapping, using the transparent tran. reg. */
 467                 unsigned long virt = (unsigned long) mac_reset;
 468                 unsigned long phys = virt_to_phys(mac_reset);
 469                 unsigned long offset = phys-virt;
 470                 local_irq_disable(); /* lets not screw this up, ok? */
 471                 __asm__ __volatile__(".chip 68030\n\t"
 472                                      "pmove %0,%/tt0\n\t"
 473                                      ".chip 68k"
 474                                      : : "m" ((phys&0xFF000000)|0x8777));
 475                 /* Now jump to physical address so we can disable MMU */
 476                 __asm__ __volatile__(
 477                     ".chip 68030\n\t"
 478                     "lea %/pc@(1f),%/a0\n\t"
 479                     "addl %0,%/a0\n\t"/* fixup target address and stack ptr */
 480                     "addl %0,%/sp\n\t"
 481                     "pflusha\n\t"
 482                     "jmp %/a0@\n\t" /* jump into physical memory */
 483                     "0:.long 0\n\t" /* a constant zero. */
 484                     /* OK.  Now reset everything and jump to reset vector. */
 485                     "1:\n\t"
 486                     "lea %/pc@(0b),%/a0\n\t"
 487                     "pmove %/a0@, %/tc\n\t" /* disable mmu */
 488                     "pmove %/a0@, %/tt0\n\t" /* disable tt0 */
 489                     "pmove %/a0@, %/tt1\n\t" /* disable tt1 */
 490                     "movel #0, %/a0\n\t"
 491                     "movec %/a0, %/vbr\n\t" /* clear vector base register */
 492                     "movec %/a0, %/cacr\n\t" /* disable caches */
 493                     "movel #0x0808,%/a0\n\t"
 494                     "movec %/a0, %/cacr\n\t" /* flush i&d caches */
 495                     "movew #0x2700,%/sr\n\t" /* set up status register */
 496                     "movel %1@(0x0),%/a0\n\t"/* load interrupt stack pointer */
 497                     "movec %/a0, %/isp\n\t"
 498                     "movel %1@(0x4),%/a0\n\t" /* load reset vector */
 499                     "reset\n\t" /* reset external devices */
 500                     "jmp %/a0@\n\t" /* jump to the reset vector */
 501                     ".chip 68k"
 502                     : : "r" (offset), "a" (rombase) : "a0");
 503         }
 504
 505         /* should never get here */
 506         local_irq_enable();
 507         printk ("Restart failed.  Please restart manually.\n");
 508         while(1);
 509 }
 510
 511 /*
 512  * This function translates seconds since 1970 into a proper date.
 513  *
 514  * Algorithm cribbed from glibc2.1, __offtime().
 515  */
 516 #define SECS_PER_MINUTE (60)
 517 #define SECS_PER_HOUR  (SECS_PER_MINUTE * 60)
 518 #define SECS_PER_DAY   (SECS_PER_HOUR * 24)
 519
 520 static void unmktime(unsigned long time, long offset,
 521                      int *yearp, int *monp, int *dayp,
 522                      int *hourp, int *minp, int *secp)
 523 {
 524         /* How many days come before each month (0-12).  */
 525         static const unsigned short int __mon_yday[2][13] =
 526         {
 527                 /* Normal years.  */
 528                 { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 },
 529                 /* Leap years.  */
 530                 { 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 }
 531         };
 532         long int days, rem, y, wday, yday;
 533         const unsigned short int *ip;
 534
 535         days = time / SECS_PER_DAY;
 536         rem = time % SECS_PER_DAY;
 537         rem += offset;
 538         while (rem < 0) {
 539                 rem += SECS_PER_DAY;
 540                 --days;
 541         }
 542         while (rem >= SECS_PER_DAY) {
 543                 rem -= SECS_PER_DAY;
 544                 ++days;
 545         }
 546         *hourp = rem / SECS_PER_HOUR;
 547         rem %= SECS_PER_HOUR;
 548         *minp = rem / SECS_PER_MINUTE;
 549         *secp = rem % SECS_PER_MINUTE;
 550         /* January 1, 1970 was a Thursday. */
 551         wday = (4 + days) % 7; /* Day in the week. Not currently used */
 552         if (wday < 0) wday += 7;
 553         y = 1970;
 554
 555 #define DIV(a, b) ((a) / (b) - ((a) % (b) < 0))
 556 #define LEAPS_THRU_END_OF(y) (DIV (y, 4) - DIV (y, 100) + DIV (y, 400))
 557 #define __isleap(year)  \
 558   ((year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0))
 559
 560         while (days < 0 || days >= (__isleap (y) ? 366 : 365))
 561         {
 562                 /* Guess a corrected year, assuming 365 days per year.  */
 563                 long int yg = y + days / 365 - (days % 365 < 0);
 564
 565                 /* Adjust DAYS and Y to match the guessed year.  */
 566                 days -= ((yg - y) * 365
 567                          + LEAPS_THRU_END_OF (yg - 1)
 568                          - LEAPS_THRU_END_OF (y - 1));
 569                 y = yg;
 570         }
 571         *yearp = y - 1900;
 572         yday = days; /* day in the year.  Not currently used. */
 573         ip = __mon_yday[__isleap(y)];
 574         for (y = 11; days < (long int) ip[y]; --y)
 575                 continue;
 576         days -= ip[y];
 577         *monp = y;
 578         *dayp = days + 1; /* day in the month */
 579         return;
 580 }
 581
 582 /*
 583  * Read/write the hardware clock.
 584  */
 585
 586 int mac_hwclk(int op, struct rtc_time *t)
 587 {
 588         unsigned long now;
 589
 590         if (!op) { /* read */
 591                 if (macintosh_config->adb_type == MAC_ADB_II) {
 592                         now = via_read_time();
 593                 } else
 594 #ifdef CONFIG_ADB
 595                 if ((macintosh_config->adb_type == MAC_ADB_IISI) ||
 596                            (macintosh_config->adb_type == MAC_ADB_PB1) ||
 597                            (macintosh_config->adb_type == MAC_ADB_PB2) ||
 598                            (macintosh_config->adb_type == MAC_ADB_CUDA)) {
 599                         now = adb_read_time();
 600                 } else
 601 #endif
 602                 if (macintosh_config->adb_type == MAC_ADB_IOP) {
 603                         now = via_read_time();
 604                 } else {
 605                         now = 0;
 606                 }
 607
 608                 t->tm_wday = 0;
 609                 unmktime(now, 0,
 610                          &t->tm_year, &t->tm_mon, &t->tm_mday,
 611                          &t->tm_hour, &t->tm_min, &t->tm_sec);
 612                 printk("mac_hwclk: read %04d-%02d-%-2d %02d:%02d:%02d\n",
 613                         t->tm_year + 1900, t->tm_mon + 1, t->tm_mday, t->tm_hour, t->tm_min, t->tm_sec);
 614         } else { /* write */
 615                 printk("mac_hwclk: tried to write %04d-%02d-%-2d %02d:%02d:%02d\n",
 616                         t->tm_year + 1900, t->tm_mon + 1, t->tm_mday, t->tm_hour, t->tm_min, t->tm_sec);
 617
 618 #if 0   /* it trashes my rtc */
 619                 now = mktime(t->tm_year + 1900, t->tm_mon + 1, t->tm_mday,
 620                              t->tm_hour, t->tm_min, t->tm_sec);
 621
 622                 if (macintosh_config->adb_type == MAC_ADB_II) {
 623                         via_write_time(now);
 624                 } else if ((macintosh_config->adb_type == MAC_ADB_IISI) ||
 625                            (macintosh_config->adb_type == MAC_ADB_PB1) ||
 626                            (macintosh_config->adb_type == MAC_ADB_PB2) ||
 627                            (macintosh_config->adb_type == MAC_ADB_CUDA)) {
 628                         adb_write_time(now);
 629                 } else if (macintosh_config->adb_type == MAC_ADB_IOP) {
 630                         via_write_time(now);
 631                 }
 632 #endif
 633         }
 634         return 0;
 635 }
 636
 637 /*
 638  * Set minutes/seconds in the hardware clock
 639  */
 640
 641 int mac_set_clock_mmss (unsigned long nowtime)
 642 {
 643         struct rtc_time now;
 644
 645         mac_hwclk(0, &now);
 646         now.tm_sec = nowtime % 60;
 647         now.tm_min = (nowtime / 60) % 60;
 648         mac_hwclk(1, &now);
 649
 650         return 0;
 651 }