arch/m68k/mac/misc.c

   1 /*
   2  * Miscellaneous Mac68K-specific stuff
   3  */
   4
   5 #include <linux/types.h>
   6 #include <linux/errno.h>
   7 #include <linux/miscdevice.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 /* Offset between Unix time (1970-based) and Mac time (1904-based) */
  30
  31 #define RTC_OFFSET 2082844800
  32
  33 static void (*rom_reset)(void);
  34
  35 #ifdef CONFIG_ADB_CUDA
  36 static long cuda_read_time(void)
  37 {
  38         struct adb_request req;
  39         long time;
  40
  41         if (cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_GET_TIME) < 0)
  42                 return 0;
  43         while (!req.complete)
  44                 cuda_poll();
  45
  46         time = (req.reply[3] << 24) | (req.reply[4] << 16)
  47                 | (req.reply[5] << 8) | req.reply[6];
  48         return time - RTC_OFFSET;
  49 }
  50
  51 static void cuda_write_time(long data)
  52 {
  53         struct adb_request req;
  54         data += RTC_OFFSET;
  55         if (cuda_request(&req, NULL, 6, CUDA_PACKET, CUDA_SET_TIME,
  56                         (data >> 24) & 0xFF, (data >> 16) & 0xFF,
  57                         (data >> 8) & 0xFF, data & 0xFF) < 0)
  58                 return;
  59         while (!req.complete)
  60                 cuda_poll();
  61 }
  62
  63 static __u8 cuda_read_pram(int offset)
  64 {
  65         struct adb_request req;
  66         if (cuda_request(&req, NULL, 4, CUDA_PACKET, CUDA_GET_PRAM,
  67                         (offset >> 8) & 0xFF, offset & 0xFF) < 0)
  68                 return 0;
  69         while (!req.complete)
  70                 cuda_poll();
  71         return req.reply[3];
  72 }
  73
  74 static void cuda_write_pram(int offset, __u8 data)
  75 {
  76         struct adb_request req;
  77         if (cuda_request(&req, NULL, 5, CUDA_PACKET, CUDA_SET_PRAM,
  78                         (offset >> 8) & 0xFF, offset & 0xFF, data) < 0)
  79                 return;
  80         while (!req.complete)
  81                 cuda_poll();
  82 }
  83 #else
  84 #define cuda_read_time() 0
  85 #define cuda_write_time(n)
  86 #define cuda_read_pram NULL
  87 #define cuda_write_pram NULL
  88 #endif
  89
  90 #ifdef CONFIG_ADB_PMU68K
  91 static long pmu_read_time(void)
  92 {
  93         struct adb_request req;
  94         long time;
  95
  96         if (pmu_request(&req, NULL, 1, PMU_READ_RTC) < 0)
  97                 return 0;
  98         while (!req.complete)
  99                 pmu_poll();
 100
 101         time = (req.reply[1] << 24) | (req.reply[2] << 16)
 102                 | (req.reply[3] << 8) | req.reply[4];
 103         return time - RTC_OFFSET;
 104 }
 105
 106 static void pmu_write_time(long data)
 107 {
 108         struct adb_request req;
 109         data += RTC_OFFSET;
 110         if (pmu_request(&req, NULL, 5, PMU_SET_RTC,
 111                         (data >> 24) & 0xFF, (data >> 16) & 0xFF,
 112                         (data >> 8) & 0xFF, data & 0xFF) < 0)
 113                 return;
 114         while (!req.complete)
 115                 pmu_poll();
 116 }
 117
 118 static __u8 pmu_read_pram(int offset)
 119 {
 120         struct adb_request req;
 121         if (pmu_request(&req, NULL, 3, PMU_READ_NVRAM,
 122                         (offset >> 8) & 0xFF, offset & 0xFF) < 0)
 123                 return 0;
 124         while (!req.complete)
 125                 pmu_poll();
 126         return req.reply[3];
 127 }
 128
 129 static void pmu_write_pram(int offset, __u8 data)
 130 {
 131         struct adb_request req;
 132         if (pmu_request(&req, NULL, 4, PMU_WRITE_NVRAM,
 133                         (offset >> 8) & 0xFF, offset & 0xFF, data) < 0)
 134                 return;
 135         while (!req.complete)
 136                 pmu_poll();
 137 }
 138 #else
 139 #define pmu_read_time() 0
 140 #define pmu_write_time(n)
 141 #define pmu_read_pram NULL
 142 #define pmu_write_pram NULL
 143 #endif
 144
 145 #if 0 /* def CONFIG_ADB_MACIISI */
 146 extern int maciisi_request(struct adb_request *req,
 147                         void (*done)(struct adb_request *), int nbytes, ...);
 148
 149 static long maciisi_read_time(void)
 150 {
 151         struct adb_request req;
 152         long time;
 153
 154         if (maciisi_request(&req, NULL, 2, CUDA_PACKET, CUDA_GET_TIME))
 155                 return 0;
 156
 157         time = (req.reply[3] << 24) | (req.reply[4] << 16)
 158                 | (req.reply[5] << 8) | req.reply[6];
 159         return time - RTC_OFFSET;
 160 }
 161
 162 static void maciisi_write_time(long data)
 163 {
 164         struct adb_request req;
 165         data += RTC_OFFSET;
 166         maciisi_request(&req, NULL, 6, CUDA_PACKET, CUDA_SET_TIME,
 167                         (data >> 24) & 0xFF, (data >> 16) & 0xFF,
 168                         (data >> 8) & 0xFF, data & 0xFF);
 169 }
 170
 171 static __u8 maciisi_read_pram(int offset)
 172 {
 173         struct adb_request req;
 174         if (maciisi_request(&req, NULL, 4, CUDA_PACKET, CUDA_GET_PRAM,
 175                         (offset >> 8) & 0xFF, offset & 0xFF))
 176                 return 0;
 177         return req.reply[3];
 178 }
 179
 180 static void maciisi_write_pram(int offset, __u8 data)
 181 {
 182         struct adb_request req;
 183         maciisi_request(&req, NULL, 5, CUDA_PACKET, CUDA_SET_PRAM,
 184                         (offset >> 8) & 0xFF, offset & 0xFF, data);
 185 }
 186 #else
 187 #define maciisi_read_time() 0
 188 #define maciisi_write_time(n)
 189 #define maciisi_read_pram NULL
 190 #define maciisi_write_pram NULL
 191 #endif
 192
 193 /*
 194  * VIA PRAM/RTC access routines
 195  *
 196  * Must be called with interrupts disabled and
 197  * the RTC should be enabled.
 198  */
 199
 200 static __u8 via_pram_readbyte(void)
 201 {
 202         int     i,reg;
 203         __u8    data;
 204
 205         reg = via1[vBufB] & ~VIA1B_vRTCClk;
 206
 207         /* Set the RTC data line to be an input. */
 208
 209         via1[vDirB] &= ~VIA1B_vRTCData;
 210
 211         /* The bits of the byte come out in MSB order */
 212
 213         data = 0;
 214         for (i = 0 ; i < 8 ; i++) {
 215                 via1[vBufB] = reg;
 216                 via1[vBufB] = reg | VIA1B_vRTCClk;
 217                 data = (data << 1) | (via1[vBufB] & VIA1B_vRTCData);
 218         }
 219
 220         /* Return RTC data line to output state */
 221
 222         via1[vDirB] |= VIA1B_vRTCData;
 223
 224         return data;
 225 }
 226
 227 static void via_pram_writebyte(__u8 data)
 228 {
 229         int     i,reg,bit;
 230
 231         reg = via1[vBufB] & ~(VIA1B_vRTCClk | VIA1B_vRTCData);
 232
 233         /* The bits of the byte go in in MSB order */
 234
 235         for (i = 0 ; i < 8 ; i++) {
 236                 bit = data & 0x80? 1 : 0;
 237                 data <<= 1;
 238                 via1[vBufB] = reg | bit;
 239                 via1[vBufB] = reg | bit | VIA1B_vRTCClk;
 240         }
 241 }
 242
 243 /*
 244  * Execute a VIA PRAM/RTC command. For read commands
 245  * data should point to a one-byte buffer for the
 246  * resulting data. For write commands it should point
 247  * to the data byte to for the command.
 248  *
 249  * This function disables all interrupts while running.
 250  */
 251
 252 static void via_pram_command(int command, __u8 *data)
 253 {
 254         unsigned long flags;
 255         int     is_read;
 256
 257         local_irq_save(flags);
 258
 259         /* Enable the RTC and make sure the strobe line is high */
 260
 261         via1[vBufB] = (via1[vBufB] | VIA1B_vRTCClk) & ~VIA1B_vRTCEnb;
 262
 263         if (command & 0xFF00) {         /* extended (two-byte) command */
 264                 via_pram_writebyte((command & 0xFF00) >> 8);
 265                 via_pram_writebyte(command & 0xFF);
 266                 is_read = command & 0x8000;
 267         } else {                        /* one-byte command */
 268                 via_pram_writebyte(command);
 269                 is_read = command & 0x80;
 270         }
 271         if (is_read) {
 272                 *data = via_pram_readbyte();
 273         } else {
 274                 via_pram_writebyte(*data);
 275         }
 276
 277         /* All done, disable the RTC */
 278
 279         via1[vBufB] |= VIA1B_vRTCEnb;
 280
 281         local_irq_restore(flags);
 282 }
 283
 284 static __u8 via_read_pram(int offset)
 285 {
 286         return 0;
 287 }
 288
 289 static void via_write_pram(int offset, __u8 data)
 290 {
 291 }
 292
 293 /*
 294  * Return the current time in seconds since January 1, 1904.
 295  *
 296  * This only works on machines with the VIA-based PRAM/RTC, which
 297  * is basically any machine with Mac II-style ADB.
 298  */
 299
 300 static long via_read_time(void)
 301 {
 302         union {
 303                 __u8 cdata[4];
 304                 long idata;
 305         } result, last_result;
 306         int count = 1;
 307
 308         via_pram_command(0x81, &last_result.cdata[3]);
 309         via_pram_command(0x85, &last_result.cdata[2]);
 310         via_pram_command(0x89, &last_result.cdata[1]);
 311         via_pram_command(0x8D, &last_result.cdata[0]);
 312
 313         /*
 314          * The NetBSD guys say to loop until you get the same reading
 315          * twice in a row.
 316          */
 317
 318         while (1) {
 319                 via_pram_command(0x81, &result.cdata[3]);
 320                 via_pram_command(0x85, &result.cdata[2]);
 321                 via_pram_command(0x89, &result.cdata[1]);
 322                 via_pram_command(0x8D, &result.cdata[0]);
 323
 324                 if (result.idata == last_result.idata)
 325                         return result.idata - RTC_OFFSET;
 326
 327                 if (++count > 10)
 328                         break;
 329
 330                 last_result.idata = result.idata;
 331         }
 332
 333         pr_err("via_read_time: failed to read a stable value; "
 334                "got 0x%08lx then 0x%08lx\n",
 335                last_result.idata, result.idata);
 336
 337         return 0;
 338 }
 339
 340 /*
 341  * Set the current time to a number of seconds since January 1, 1904.
 342  *
 343  * This only works on machines with the VIA-based PRAM/RTC, which
 344  * is basically any machine with Mac II-style ADB.
 345  */
 346
 347 static void via_write_time(long time)
 348 {
 349         union {
 350                 __u8  cdata[4];
 351                 long  idata;
 352         } data;
 353         __u8    temp;
 354
 355         /* Clear the write protect bit */
 356
 357         temp = 0x55;
 358         via_pram_command(0x35, &temp);
 359
 360         data.idata = time + RTC_OFFSET;
 361         via_pram_command(0x01, &data.cdata[3]);
 362         via_pram_command(0x05, &data.cdata[2]);
 363         via_pram_command(0x09, &data.cdata[1]);
 364         via_pram_command(0x0D, &data.cdata[0]);
 365
 366         /* Set the write protect bit */
 367
 368         temp = 0xD5;
 369         via_pram_command(0x35, &temp);
 370 }
 371
 372 static void via_shutdown(void)
 373 {
 374         if (rbv_present) {
 375                 via2[rBufB] &= ~0x04;
 376         } else {
 377                 /* Direction of vDirB is output */
 378                 via2[vDirB] |= 0x04;
 379                 /* Send a value of 0 on that line */
 380                 via2[vBufB] &= ~0x04;
 381                 mdelay(1000);
 382         }
 383 }
 384
 385 /*
 386  * FIXME: not sure how this is supposed to work exactly...
 387  */
 388
 389 static void oss_shutdown(void)
 390 {
 391         oss->rom_ctrl = OSS_POWEROFF;
 392 }
 393
 394 #ifdef CONFIG_ADB_CUDA
 395
 396 static void cuda_restart(void)
 397 {
 398         struct adb_request req;
 399         if (cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_RESET_SYSTEM) < 0)
 400                 return;
 401         while (!req.complete)
 402                 cuda_poll();
 403 }
 404
 405 static void cuda_shutdown(void)
 406 {
 407         struct adb_request req;
 408         if (cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_POWERDOWN) < 0)
 409                 return;
 410         while (!req.complete)
 411                 cuda_poll();
 412 }
 413
 414 #endif /* CONFIG_ADB_CUDA */
 415
 416 #ifdef CONFIG_ADB_PMU68K
 417
 418 void pmu_restart(void)
 419 {
 420         struct adb_request req;
 421         if (pmu_request(&req, NULL,
 422                         2, PMU_SET_INTR_MASK, PMU_INT_ADB|PMU_INT_TICK) < 0)
 423                 return;
 424         while (!req.complete)
 425                 pmu_poll();
 426         if (pmu_request(&req, NULL, 1, PMU_RESET) < 0)
 427                 return;
 428         while (!req.complete)
 429                 pmu_poll();
 430 }
 431
 432 void pmu_shutdown(void)
 433 {
 434         struct adb_request req;
 435         if (pmu_request(&req, NULL,
 436                         2, PMU_SET_INTR_MASK, PMU_INT_ADB|PMU_INT_TICK) < 0)
 437                 return;
 438         while (!req.complete)
 439                 pmu_poll();
 440         if (pmu_request(&req, NULL, 5, PMU_SHUTDOWN, 'M', 'A', 'T', 'T') < 0)
 441                 return;
 442         while (!req.complete)
 443                 pmu_poll();
 444 }
 445
 446 #endif
 447
 448 /*
 449  *-------------------------------------------------------------------
 450  * Below this point are the generic routines; they'll dispatch to the
 451  * correct routine for the hardware on which we're running.
 452  *-------------------------------------------------------------------
 453  */
 454
 455 void mac_pram_read(int offset, __u8 *buffer, int len)
 456 {
 457         __u8 (*func)(int);
 458         int i;
 459
 460         switch(macintosh_config->adb_type) {
 461         case MAC_ADB_IISI:
 462                 func = maciisi_read_pram; break;
 463         case MAC_ADB_PB1:
 464         case MAC_ADB_PB2:
 465                 func = pmu_read_pram; break;
 466         case MAC_ADB_CUDA:
 467                 func = cuda_read_pram; break;
 468         default:
 469                 func = via_read_pram;
 470         }
 471         if (!func)
 472                 return;
 473         for (i = 0 ; i < len ; i++) {
 474                 buffer[i] = (*func)(offset++);
 475         }
 476 }
 477
 478 void mac_pram_write(int offset, __u8 *buffer, int len)
 479 {
 480         void (*func)(int, __u8);
 481         int i;
 482
 483         switch(macintosh_config->adb_type) {
 484         case MAC_ADB_IISI:
 485                 func = maciisi_write_pram; break;
 486         case MAC_ADB_PB1:
 487         case MAC_ADB_PB2:
 488                 func = pmu_write_pram; break;
 489         case MAC_ADB_CUDA:
 490                 func = cuda_write_pram; break;
 491         default:
 492                 func = via_write_pram;
 493         }
 494         if (!func)
 495                 return;
 496         for (i = 0 ; i < len ; i++) {
 497                 (*func)(offset++, buffer[i]);
 498         }
 499 }
 500
 501 void mac_poweroff(void)
 502 {
 503         /*
 504          * MAC_ADB_IISI may need to be moved up here if it doesn't actually
 505          * work using the ADB packet method.  --David Kilzer
 506          */
 507
 508         if (oss_present) {
 509                 oss_shutdown();
 510         } else if (macintosh_config->adb_type == MAC_ADB_II) {
 511                 via_shutdown();
 512 #ifdef CONFIG_ADB_CUDA
 513         } else if (macintosh_config->adb_type == MAC_ADB_CUDA) {
 514                 cuda_shutdown();
 515 #endif
 516 #ifdef CONFIG_ADB_PMU68K
 517         } else if (macintosh_config->adb_type == MAC_ADB_PB1
 518                 || macintosh_config->adb_type == MAC_ADB_PB2) {
 519                 pmu_shutdown();
 520 #endif
 521         }
 522         local_irq_enable();
 523         printk("It is now safe to turn off your Macintosh.\n");
 524         while(1);
 525 }
 526
 527 void mac_reset(void)
 528 {
 529         if (macintosh_config->adb_type == MAC_ADB_II) {
 530                 unsigned long flags;
 531
 532                 /* need ROMBASE in booter */
 533                 /* indeed, plus need to MAP THE ROM !! */
 534
 535                 if (mac_bi_data.rombase == 0)
 536                         mac_bi_data.rombase = 0x40800000;
 537
 538                 /* works on some */
 539                 rom_reset = (void *) (mac_bi_data.rombase + 0xa);
 540
 541                 if (macintosh_config->ident == MAC_MODEL_SE30) {
 542                         /*
 543                          * MSch: Machines known to crash on ROM reset ...
 544                          */
 545                 } else {
 546                         local_irq_save(flags);
 547
 548                         rom_reset();
 549
 550                         local_irq_restore(flags);
 551                 }
 552 #ifdef CONFIG_ADB_CUDA
 553         } else if (macintosh_config->adb_type == MAC_ADB_CUDA) {
 554                 cuda_restart();
 555 #endif
 556 #ifdef CONFIG_ADB_PMU68K
 557         } else if (macintosh_config->adb_type == MAC_ADB_PB1
 558                 || macintosh_config->adb_type == MAC_ADB_PB2) {
 559                 pmu_restart();
 560 #endif
 561         } else if (CPU_IS_030) {
 562
 563                 /* 030-specific reset routine.  The idea is general, but the
 564                  * specific registers to reset are '030-specific.  Until I
 565                  * have a non-030 machine, I can't test anything else.
 566                  *  -- C. Scott Ananian <cananian@alumni.princeton.edu>
 567                  */
 568
 569                 unsigned long rombase = 0x40000000;
 570
 571                 /* make a 1-to-1 mapping, using the transparent tran. reg. */
 572                 unsigned long virt = (unsigned long) mac_reset;
 573                 unsigned long phys = virt_to_phys(mac_reset);
 574                 unsigned long addr = (phys&0xFF000000)|0x8777;
 575                 unsigned long offset = phys-virt;
 576                 local_irq_disable(); /* lets not screw this up, ok? */
 577                 __asm__ __volatile__(".chip 68030\n\t"
 578                                      "pmove %0,%/tt0\n\t"
 579                                      ".chip 68k"
 580                                      : : "m" (addr));
 581                 /* Now jump to physical address so we can disable MMU */
 582                 __asm__ __volatile__(
 583                     ".chip 68030\n\t"
 584                     "lea %/pc@(1f),%/a0\n\t"
 585                     "addl %0,%/a0\n\t"/* fixup target address and stack ptr */
 586                     "addl %0,%/sp\n\t"
 587                     "pflusha\n\t"
 588                     "jmp %/a0@\n\t" /* jump into physical memory */
 589                     "0:.long 0\n\t" /* a constant zero. */
 590                     /* OK.  Now reset everything and jump to reset vector. */
 591                     "1:\n\t"
 592                     "lea %/pc@(0b),%/a0\n\t"
 593                     "pmove %/a0@, %/tc\n\t" /* disable mmu */
 594                     "pmove %/a0@, %/tt0\n\t" /* disable tt0 */
 595                     "pmove %/a0@, %/tt1\n\t" /* disable tt1 */
 596                     "movel #0, %/a0\n\t"
 597                     "movec %/a0, %/vbr\n\t" /* clear vector base register */
 598                     "movec %/a0, %/cacr\n\t" /* disable caches */
 599                     "movel #0x0808,%/a0\n\t"
 600                     "movec %/a0, %/cacr\n\t" /* flush i&d caches */
 601                     "movew #0x2700,%/sr\n\t" /* set up status register */
 602                     "movel %1@(0x0),%/a0\n\t"/* load interrupt stack pointer */
 603                     "movec %/a0, %/isp\n\t"
 604                     "movel %1@(0x4),%/a0\n\t" /* load reset vector */
 605                     "reset\n\t" /* reset external devices */
 606                     "jmp %/a0@\n\t" /* jump to the reset vector */
 607                     ".chip 68k"
 608                     : : "r" (offset), "a" (rombase) : "a0");
 609         }
 610
 611         /* should never get here */
 612         local_irq_enable();
 613         printk ("Restart failed.  Please restart manually.\n");
 614         while(1);
 615 }
 616
 617 /*
 618  * This function translates seconds since 1970 into a proper date.
 619  *
 620  * Algorithm cribbed from glibc2.1, __offtime().
 621  */
 622 #define SECS_PER_MINUTE (60)
 623 #define SECS_PER_HOUR  (SECS_PER_MINUTE * 60)
 624 #define SECS_PER_DAY   (SECS_PER_HOUR * 24)
 625
 626 static void unmktime(unsigned long time, long offset,
 627                      int *yearp, int *monp, int *dayp,
 628                      int *hourp, int *minp, int *secp)
 629 {
 630         /* How many days come before each month (0-12).  */
 631         static const unsigned short int __mon_yday[2][13] =
 632         {
 633                 /* Normal years.  */
 634                 { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 },
 635                 /* Leap years.  */
 636                 { 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 }
 637         };
 638         long int days, rem, y, wday, yday;
 639         const unsigned short int *ip;
 640
 641         days = time / SECS_PER_DAY;
 642         rem = time % SECS_PER_DAY;
 643         rem += offset;
 644         while (rem < 0) {
 645                 rem += SECS_PER_DAY;
 646                 --days;
 647         }
 648         while (rem >= SECS_PER_DAY) {
 649                 rem -= SECS_PER_DAY;
 650                 ++days;
 651         }
 652         *hourp = rem / SECS_PER_HOUR;
 653         rem %= SECS_PER_HOUR;
 654         *minp = rem / SECS_PER_MINUTE;
 655         *secp = rem % SECS_PER_MINUTE;
 656         /* January 1, 1970 was a Thursday. */
 657         wday = (4 + days) % 7; /* Day in the week. Not currently used */
 658         if (wday < 0) wday += 7;
 659         y = 1970;
 660
 661 #define DIV(a, b) ((a) / (b) - ((a) % (b) < 0))
 662 #define LEAPS_THRU_END_OF(y) (DIV (y, 4) - DIV (y, 100) + DIV (y, 400))
 663 #define __isleap(year)  \
 664   ((year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0))
 665
 666         while (days < 0 || days >= (__isleap (y) ? 366 : 365))
 667         {
 668                 /* Guess a corrected year, assuming 365 days per year.  */
 669                 long int yg = y + days / 365 - (days % 365 < 0);
 670
 671                 /* Adjust DAYS and Y to match the guessed year.  */
 672                 days -= ((yg - y) * 365
 673                          + LEAPS_THRU_END_OF (yg - 1)
 674                          - LEAPS_THRU_END_OF (y - 1));
 675                 y = yg;
 676         }
 677         *yearp = y - 1900;
 678         yday = days; /* day in the year.  Not currently used. */
 679         ip = __mon_yday[__isleap(y)];
 680         for (y = 11; days < (long int) ip[y]; --y)
 681                 continue;
 682         days -= ip[y];
 683         *monp = y;
 684         *dayp = days + 1; /* day in the month */
 685         return;
 686 }
 687
 688 /*
 689  * Read/write the hardware clock.
 690  */
 691
 692 int mac_hwclk(int op, struct rtc_time *t)
 693 {
 694         unsigned long now;
 695
 696         if (!op) { /* read */
 697                 switch (macintosh_config->adb_type) {
 698                 case MAC_ADB_II:
 699                 case MAC_ADB_IOP:
 700                         now = via_read_time();
 701                         break;
 702                 case MAC_ADB_IISI:
 703                         now = maciisi_read_time();
 704                         break;
 705                 case MAC_ADB_PB1:
 706                 case MAC_ADB_PB2:
 707                         now = pmu_read_time();
 708                         break;
 709                 case MAC_ADB_CUDA:
 710                         now = cuda_read_time();
 711                         break;
 712                 default:
 713                         now = 0;
 714                 }
 715
 716                 t->tm_wday = 0;
 717                 unmktime(now, 0,
 718                          &t->tm_year, &t->tm_mon, &t->tm_mday,
 719                          &t->tm_hour, &t->tm_min, &t->tm_sec);
 720 #if 0
 721                 printk("mac_hwclk: read %04d-%02d-%-2d %02d:%02d:%02d\n",
 722                         t->tm_year + 1900, t->tm_mon + 1, t->tm_mday,
 723                         t->tm_hour, t->tm_min, t->tm_sec);
 724 #endif
 725         } else { /* write */
 726 #if 0
 727                 printk("mac_hwclk: tried to write %04d-%02d-%-2d %02d:%02d:%02d\n",
 728                         t->tm_year + 1900, t->tm_mon + 1, t->tm_mday,
 729                         t->tm_hour, t->tm_min, t->tm_sec);
 730 #endif
 731
 732                 now = mktime(t->tm_year + 1900, t->tm_mon + 1, t->tm_mday,
 733                              t->tm_hour, t->tm_min, t->tm_sec);
 734
 735                 switch (macintosh_config->adb_type) {
 736                 case MAC_ADB_II:
 737                 case MAC_ADB_IOP:
 738                         via_write_time(now);
 739                         break;
 740                 case MAC_ADB_CUDA:
 741                         cuda_write_time(now);
 742                         break;
 743                 case MAC_ADB_PB1:
 744                 case MAC_ADB_PB2:
 745                         pmu_write_time(now);
 746                         break;
 747                 case MAC_ADB_IISI:
 748                         maciisi_write_time(now);
 749                 }
 750         }
 751         return 0;
 752 }
 753
 754 /*
 755  * Set minutes/seconds in the hardware clock
 756  */
 757
 758 int mac_set_clock_mmss (unsigned long nowtime)
 759 {
 760         struct rtc_time now;
 761
 762         mac_hwclk(0, &now);
 763         now.tm_sec = nowtime % 60;
 764         now.tm_min = (nowtime / 60) % 60;
 765         mac_hwclk(1, &now);
 766
 767         return 0;
 768 }