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