arch/sparc64/kernel/time.c

   1 /* $Id: time.c,v 1.42 2002/01/23 14:33:55 davem Exp $
   2  * time.c: UltraSparc timer and TOD clock support.
   3  *
   4  * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
   5  * Copyright (C) 1998 Eddie C. Dost   (ecd@skynet.be)
   6  *
   7  * Based largely on code which is:
   8  *
   9  * Copyright (C) 1996 Thomas K. Dyas (tdyas@eden.rutgers.edu)
  10  */
  11
  12 #include <linux/errno.h>
  13 #include <linux/module.h>
  14 #include <linux/sched.h>
  15 #include <linux/kernel.h>
  16 #include <linux/param.h>
  17 #include <linux/string.h>
  18 #include <linux/mm.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/time.h>
  21 #include <linux/timex.h>
  22 #include <linux/init.h>
  23 #include <linux/ioport.h>
  24 #include <linux/mc146818rtc.h>
  25 #include <linux/delay.h>
  26 #include <linux/profile.h>
  27 #include <linux/bcd.h>
  28 #include <linux/jiffies.h>
  29 #include <linux/cpufreq.h>
  30 #include <linux/percpu.h>
  31 #include <linux/profile.h>
  32 #include <linux/miscdevice.h>
  33 #include <linux/rtc.h>
  34 #include <linux/kernel_stat.h>
  35 #include <linux/clockchips.h>
  36 #include <linux/clocksource.h>
  37
  38 #include <asm/oplib.h>
  39 #include <asm/mostek.h>
  40 #include <asm/timer.h>
  41 #include <asm/irq.h>
  42 #include <asm/io.h>
  43 #include <asm/prom.h>
  44 #include <asm/of_device.h>
  45 #include <asm/starfire.h>
  46 #include <asm/smp.h>
  47 #include <asm/sections.h>
  48 #include <asm/cpudata.h>
  49 #include <asm/uaccess.h>
  50 #include <asm/prom.h>
  51 #include <asm/irq_regs.h>
  52
  53 DEFINE_SPINLOCK(mostek_lock);
  54 DEFINE_SPINLOCK(rtc_lock);
  55 void __iomem *mstk48t02_regs = NULL;
  56 #ifdef CONFIG_PCI
  57 unsigned long ds1287_regs = 0UL;
  58 static void __iomem *bq4802_regs;
  59 #endif
  60
  61 static void __iomem *mstk48t08_regs;
  62 static void __iomem *mstk48t59_regs;
  63
  64 static int set_rtc_mmss(unsigned long);
  65
  66 #define TICK_PRIV_BIT   (1UL << 63)
  67 #define TICKCMP_IRQ_BIT (1UL << 63)
  68
  69 #ifdef CONFIG_SMP
  70 unsigned long profile_pc(struct pt_regs *regs)
  71 {
  72         unsigned long pc = instruction_pointer(regs);
  73
  74         if (in_lock_functions(pc))
  75                 return regs->u_regs[UREG_RETPC];
  76         return pc;
  77 }
  78 EXPORT_SYMBOL(profile_pc);
  79 #endif
  80
  81 static void tick_disable_protection(void)
  82 {
  83         /* Set things up so user can access tick register for profiling
  84          * purposes.  Also workaround BB_ERRATA_1 by doing a dummy
  85          * read back of %tick after writing it.
  86          */
  87         __asm__ __volatile__(
  88         "       ba,pt   %%xcc, 1f\n"
  89         "        nop\n"
  90         "       .align  64\n"
  91         "1:     rd      %%tick, %%g2\n"
  92         "       add     %%g2, 6, %%g2\n"
  93         "       andn    %%g2, %0, %%g2\n"
  94         "       wrpr    %%g2, 0, %%tick\n"
  95         "       rdpr    %%tick, %%g0"
  96         : /* no outputs */
  97         : "r" (TICK_PRIV_BIT)
  98         : "g2");
  99 }
 100
 101 static void tick_disable_irq(void)
 102 {
 103         __asm__ __volatile__(
 104         "       ba,pt   %%xcc, 1f\n"
 105         "        nop\n"
 106         "       .align  64\n"
 107         "1:     wr      %0, 0x0, %%tick_cmpr\n"
 108         "       rd      %%tick_cmpr, %%g0"
 109         : /* no outputs */
 110         : "r" (TICKCMP_IRQ_BIT));
 111 }
 112
 113 static void tick_init_tick(void)
 114 {
 115         tick_disable_protection();
 116         tick_disable_irq();
 117 }
 118
 119 static unsigned long tick_get_tick(void)
 120 {
 121         unsigned long ret;
 122
 123         __asm__ __volatile__("rd        %%tick, %0\n\t"
 124                              "mov       %0, %0"
 125                              : "=r" (ret));
 126
 127         return ret & ~TICK_PRIV_BIT;
 128 }
 129
 130 static int tick_add_compare(unsigned long adj)
 131 {
 132         unsigned long orig_tick, new_tick, new_compare;
 133
 134         __asm__ __volatile__("rd        %%tick, %0"
 135                              : "=r" (orig_tick));
 136
 137         orig_tick &= ~TICKCMP_IRQ_BIT;
 138
 139         /* Workaround for Spitfire Errata (#54 I think??), I discovered
 140          * this via Sun BugID 4008234, mentioned in Solaris-2.5.1 patch
 141          * number 103640.
 142          *
 143          * On Blackbird writes to %tick_cmpr can fail, the
 144          * workaround seems to be to execute the wr instruction
 145          * at the start of an I-cache line, and perform a dummy
 146          * read back from %tick_cmpr right after writing to it. -DaveM
 147          */
 148         __asm__ __volatile__("ba,pt     %%xcc, 1f\n\t"
 149                              " add      %1, %2, %0\n\t"
 150                              ".align    64\n"
 151                              "1:\n\t"
 152                              "wr        %0, 0, %%tick_cmpr\n\t"
 153                              "rd        %%tick_cmpr, %%g0\n\t"
 154                              : "=r" (new_compare)
 155                              : "r" (orig_tick), "r" (adj));
 156
 157         __asm__ __volatile__("rd        %%tick, %0"
 158                              : "=r" (new_tick));
 159         new_tick &= ~TICKCMP_IRQ_BIT;
 160
 161         return ((long)(new_tick - (orig_tick+adj))) > 0L;
 162 }
 163
 164 static unsigned long tick_add_tick(unsigned long adj)
 165 {
 166         unsigned long new_tick;
 167
 168         /* Also need to handle Blackbird bug here too. */
 169         __asm__ __volatile__("rd        %%tick, %0\n\t"
 170                              "add       %0, %1, %0\n\t"
 171                              "wrpr      %0, 0, %%tick\n\t"
 172                              : "=&r" (new_tick)
 173                              : "r" (adj));
 174
 175         return new_tick;
 176 }
 177
 178 static struct sparc64_tick_ops tick_operations __read_mostly = {
 179         .name           =       "tick",
 180         .init_tick      =       tick_init_tick,
 181         .disable_irq    =       tick_disable_irq,
 182         .get_tick       =       tick_get_tick,
 183         .add_tick       =       tick_add_tick,
 184         .add_compare    =       tick_add_compare,
 185         .softint_mask   =       1UL << 0,
 186 };
 187
 188 struct sparc64_tick_ops *tick_ops __read_mostly = &tick_operations;
 189
 190 static void stick_disable_irq(void)
 191 {
 192         __asm__ __volatile__(
 193         "wr     %0, 0x0, %%asr25"
 194         : /* no outputs */
 195         : "r" (TICKCMP_IRQ_BIT));
 196 }
 197
 198 static void stick_init_tick(void)
 199 {
 200         /* Writes to the %tick and %stick register are not
 201          * allowed on sun4v.  The Hypervisor controls that
 202          * bit, per-strand.
 203          */
 204         if (tlb_type != hypervisor) {
 205                 tick_disable_protection();
 206                 tick_disable_irq();
 207
 208                 /* Let the user get at STICK too. */
 209                 __asm__ __volatile__(
 210                 "       rd      %%asr24, %%g2\n"
 211                 "       andn    %%g2, %0, %%g2\n"
 212                 "       wr      %%g2, 0, %%asr24"
 213                 : /* no outputs */
 214                 : "r" (TICK_PRIV_BIT)
 215                 : "g1", "g2");
 216         }
 217
 218         stick_disable_irq();
 219 }
 220
 221 static unsigned long stick_get_tick(void)
 222 {
 223         unsigned long ret;
 224
 225         __asm__ __volatile__("rd        %%asr24, %0"
 226                              : "=r" (ret));
 227
 228         return ret & ~TICK_PRIV_BIT;
 229 }
 230
 231 static unsigned long stick_add_tick(unsigned long adj)
 232 {
 233         unsigned long new_tick;
 234
 235         __asm__ __volatile__("rd        %%asr24, %0\n\t"
 236                              "add       %0, %1, %0\n\t"
 237                              "wr        %0, 0, %%asr24\n\t"
 238                              : "=&r" (new_tick)
 239                              : "r" (adj));
 240
 241         return new_tick;
 242 }
 243
 244 static int stick_add_compare(unsigned long adj)
 245 {
 246         unsigned long orig_tick, new_tick;
 247
 248         __asm__ __volatile__("rd        %%asr24, %0"
 249                              : "=r" (orig_tick));
 250         orig_tick &= ~TICKCMP_IRQ_BIT;
 251
 252         __asm__ __volatile__("wr        %0, 0, %%asr25"
 253                              : /* no outputs */
 254                              : "r" (orig_tick + adj));
 255
 256         __asm__ __volatile__("rd        %%asr24, %0"
 257                              : "=r" (new_tick));
 258         new_tick &= ~TICKCMP_IRQ_BIT;
 259
 260         return ((long)(new_tick - (orig_tick+adj))) > 0L;
 261 }
 262
 263 static struct sparc64_tick_ops stick_operations __read_mostly = {
 264         .name           =       "stick",
 265         .init_tick      =       stick_init_tick,
 266         .disable_irq    =       stick_disable_irq,
 267         .get_tick       =       stick_get_tick,
 268         .add_tick       =       stick_add_tick,
 269         .add_compare    =       stick_add_compare,
 270         .softint_mask   =       1UL << 16,
 271 };
 272
 273 /* On Hummingbird the STICK/STICK_CMPR register is implemented
 274  * in I/O space.  There are two 64-bit registers each, the
 275  * first holds the low 32-bits of the value and the second holds
 276  * the high 32-bits.
 277  *
 278  * Since STICK is constantly updating, we have to access it carefully.
 279  *
 280  * The sequence we use to read is:
 281  * 1) read high
 282  * 2) read low
 283  * 3) read high again, if it rolled re-read both low and high again.
 284  *
 285  * Writing STICK safely is also tricky:
 286  * 1) write low to zero
 287  * 2) write high
 288  * 3) write low
 289  */
 290 #define HBIRD_STICKCMP_ADDR     0x1fe0000f060UL
 291 #define HBIRD_STICK_ADDR        0x1fe0000f070UL
 292
 293 static unsigned long __hbird_read_stick(void)
 294 {
 295         unsigned long ret, tmp1, tmp2, tmp3;
 296         unsigned long addr = HBIRD_STICK_ADDR+8;
 297
 298         __asm__ __volatile__("ldxa      [%1] %5, %2\n"
 299                              "1:\n\t"
 300                              "sub       %1, 0x8, %1\n\t"
 301                              "ldxa      [%1] %5, %3\n\t"
 302                              "add       %1, 0x8, %1\n\t"
 303                              "ldxa      [%1] %5, %4\n\t"
 304                              "cmp       %4, %2\n\t"
 305                              "bne,a,pn  %%xcc, 1b\n\t"
 306                              " mov      %4, %2\n\t"
 307                              "sllx      %4, 32, %4\n\t"
 308                              "or        %3, %4, %0\n\t"
 309                              : "=&r" (ret), "=&r" (addr),
 310                                "=&r" (tmp1), "=&r" (tmp2), "=&r" (tmp3)
 311                              : "i" (ASI_PHYS_BYPASS_EC_E), "1" (addr));
 312
 313         return ret;
 314 }
 315
 316 static void __hbird_write_stick(unsigned long val)
 317 {
 318         unsigned long low = (val & 0xffffffffUL);
 319         unsigned long high = (val >> 32UL);
 320         unsigned long addr = HBIRD_STICK_ADDR;
 321
 322         __asm__ __volatile__("stxa      %%g0, [%0] %4\n\t"
 323                              "add       %0, 0x8, %0\n\t"
 324                              "stxa      %3, [%0] %4\n\t"
 325                              "sub       %0, 0x8, %0\n\t"
 326                              "stxa      %2, [%0] %4"
 327                              : "=&r" (addr)
 328                              : "0" (addr), "r" (low), "r" (high),
 329                                "i" (ASI_PHYS_BYPASS_EC_E));
 330 }
 331
 332 static void __hbird_write_compare(unsigned long val)
 333 {
 334         unsigned long low = (val & 0xffffffffUL);
 335         unsigned long high = (val >> 32UL);
 336         unsigned long addr = HBIRD_STICKCMP_ADDR + 0x8UL;
 337
 338         __asm__ __volatile__("stxa      %3, [%0] %4\n\t"
 339                              "sub       %0, 0x8, %0\n\t"
 340                              "stxa      %2, [%0] %4"
 341                              : "=&r" (addr)
 342                              : "0" (addr), "r" (low), "r" (high),
 343                                "i" (ASI_PHYS_BYPASS_EC_E));
 344 }
 345
 346 static void hbtick_disable_irq(void)
 347 {
 348         __hbird_write_compare(TICKCMP_IRQ_BIT);
 349 }
 350
 351 static void hbtick_init_tick(void)
 352 {
 353         tick_disable_protection();
 354
 355         /* XXX This seems to be necessary to 'jumpstart' Hummingbird
 356          * XXX into actually sending STICK interrupts.  I think because
 357          * XXX of how we store %tick_cmpr in head.S this somehow resets the
 358          * XXX {TICK + STICK} interrupt mux.  -DaveM
 359          */
 360         __hbird_write_stick(__hbird_read_stick());
 361
 362         hbtick_disable_irq();
 363 }
 364
 365 static unsigned long hbtick_get_tick(void)
 366 {
 367         return __hbird_read_stick() & ~TICK_PRIV_BIT;
 368 }
 369
 370 static unsigned long hbtick_add_tick(unsigned long adj)
 371 {
 372         unsigned long val;
 373
 374         val = __hbird_read_stick() + adj;
 375         __hbird_write_stick(val);
 376
 377         return val;
 378 }
 379
 380 static int hbtick_add_compare(unsigned long adj)
 381 {
 382         unsigned long val = __hbird_read_stick();
 383         unsigned long val2;
 384
 385         val &= ~TICKCMP_IRQ_BIT;
 386         val += adj;
 387         __hbird_write_compare(val);
 388
 389         val2 = __hbird_read_stick() & ~TICKCMP_IRQ_BIT;
 390
 391         return ((long)(val2 - val)) > 0L;
 392 }
 393
 394 static struct sparc64_tick_ops hbtick_operations __read_mostly = {
 395         .name           =       "hbtick",
 396         .init_tick      =       hbtick_init_tick,
 397         .disable_irq    =       hbtick_disable_irq,
 398         .get_tick       =       hbtick_get_tick,
 399         .add_tick       =       hbtick_add_tick,
 400         .add_compare    =       hbtick_add_compare,
 401         .softint_mask   =       1UL << 0,
 402 };
 403
 404 static unsigned long timer_ticks_per_nsec_quotient __read_mostly;
 405
 406 int update_persistent_clock(struct timespec now)
 407 {
 408         return set_rtc_mmss(now.tv_sec);
 409 }
 410
 411 /* Kick start a stopped clock (procedure from the Sun NVRAM/hostid FAQ). */
 412 static void __init kick_start_clock(void)
 413 {
 414         void __iomem *regs = mstk48t02_regs;
 415         u8 sec, tmp;
 416         int i, count;
 417
 418         prom_printf("CLOCK: Clock was stopped. Kick start ");
 419
 420         spin_lock_irq(&mostek_lock);
 421
 422         /* Turn on the kick start bit to start the oscillator. */
 423         tmp = mostek_read(regs + MOSTEK_CREG);
 424         tmp |= MSTK_CREG_WRITE;
 425         mostek_write(regs + MOSTEK_CREG, tmp);
 426         tmp = mostek_read(regs + MOSTEK_SEC);
 427         tmp &= ~MSTK_STOP;
 428         mostek_write(regs + MOSTEK_SEC, tmp);
 429         tmp = mostek_read(regs + MOSTEK_HOUR);
 430         tmp |= MSTK_KICK_START;
 431         mostek_write(regs + MOSTEK_HOUR, tmp);
 432         tmp = mostek_read(regs + MOSTEK_CREG);
 433         tmp &= ~MSTK_CREG_WRITE;
 434         mostek_write(regs + MOSTEK_CREG, tmp);
 435
 436         spin_unlock_irq(&mostek_lock);
 437
 438         /* Delay to allow the clock oscillator to start. */
 439         sec = MSTK_REG_SEC(regs);
 440         for (i = 0; i < 3; i++) {
 441                 while (sec == MSTK_REG_SEC(regs))
 442                         for (count = 0; count < 100000; count++)
 443                                 /* nothing */ ;
 444                 prom_printf(".");
 445                 sec = MSTK_REG_SEC(regs);
 446         }
 447         prom_printf("\n");
 448
 449         spin_lock_irq(&mostek_lock);
 450
 451         /* Turn off kick start and set a "valid" time and date. */
 452         tmp = mostek_read(regs + MOSTEK_CREG);
 453         tmp |= MSTK_CREG_WRITE;
 454         mostek_write(regs + MOSTEK_CREG, tmp);
 455         tmp = mostek_read(regs + MOSTEK_HOUR);
 456         tmp &= ~MSTK_KICK_START;
 457         mostek_write(regs + MOSTEK_HOUR, tmp);
 458         MSTK_SET_REG_SEC(regs,0);
 459         MSTK_SET_REG_MIN(regs,0);
 460         MSTK_SET_REG_HOUR(regs,0);
 461         MSTK_SET_REG_DOW(regs,5);
 462         MSTK_SET_REG_DOM(regs,1);
 463         MSTK_SET_REG_MONTH(regs,8);
 464         MSTK_SET_REG_YEAR(regs,1996 - MSTK_YEAR_ZERO);
 465         tmp = mostek_read(regs + MOSTEK_CREG);
 466         tmp &= ~MSTK_CREG_WRITE;
 467         mostek_write(regs + MOSTEK_CREG, tmp);
 468
 469         spin_unlock_irq(&mostek_lock);
 470
 471         /* Ensure the kick start bit is off. If it isn't, turn it off. */
 472         while (mostek_read(regs + MOSTEK_HOUR) & MSTK_KICK_START) {
 473                 prom_printf("CLOCK: Kick start still on!\n");
 474
 475                 spin_lock_irq(&mostek_lock);
 476
 477                 tmp = mostek_read(regs + MOSTEK_CREG);
 478                 tmp |= MSTK_CREG_WRITE;
 479                 mostek_write(regs + MOSTEK_CREG, tmp);
 480
 481                 tmp = mostek_read(regs + MOSTEK_HOUR);
 482                 tmp &= ~MSTK_KICK_START;
 483                 mostek_write(regs + MOSTEK_HOUR, tmp);
 484
 485                 tmp = mostek_read(regs + MOSTEK_CREG);
 486                 tmp &= ~MSTK_CREG_WRITE;
 487                 mostek_write(regs + MOSTEK_CREG, tmp);
 488
 489                 spin_unlock_irq(&mostek_lock);
 490         }
 491
 492         prom_printf("CLOCK: Kick start procedure successful.\n");
 493 }
 494
 495 /* Return nonzero if the clock chip battery is low. */
 496 static int __init has_low_battery(void)
 497 {
 498         void __iomem *regs = mstk48t02_regs;
 499         u8 data1, data2;
 500
 501         spin_lock_irq(&mostek_lock);
 502
 503         data1 = mostek_read(regs + MOSTEK_EEPROM);      /* Read some data. */
 504         mostek_write(regs + MOSTEK_EEPROM, ~data1);     /* Write back the complement. */
 505         data2 = mostek_read(regs + MOSTEK_EEPROM);      /* Read back the complement. */
 506         mostek_write(regs + MOSTEK_EEPROM, data1);      /* Restore original value. */
 507
 508         spin_unlock_irq(&mostek_lock);
 509
 510         return (data1 == data2);        /* Was the write blocked? */
 511 }
 512
 513 /* Probe for the real time clock chip. */
 514 static void __init set_system_time(void)
 515 {
 516         unsigned int year, mon, day, hour, min, sec;
 517         void __iomem *mregs = mstk48t02_regs;
 518 #ifdef CONFIG_PCI
 519         unsigned long dregs = ds1287_regs;
 520         void __iomem *bregs = bq4802_regs;
 521 #else
 522         unsigned long dregs = 0UL;
 523         void __iomem *bregs = 0UL;
 524 #endif
 525         u8 tmp;
 526
 527         if (!mregs && !dregs && !bregs) {
 528                 prom_printf("Something wrong, clock regs not mapped yet.\n");
 529                 prom_halt();
 530         }
 531
 532         if (mregs) {
 533                 spin_lock_irq(&mostek_lock);
 534
 535                 /* Traditional Mostek chip. */
 536                 tmp = mostek_read(mregs + MOSTEK_CREG);
 537                 tmp |= MSTK_CREG_READ;
 538                 mostek_write(mregs + MOSTEK_CREG, tmp);
 539
 540                 sec = MSTK_REG_SEC(mregs);
 541                 min = MSTK_REG_MIN(mregs);
 542                 hour = MSTK_REG_HOUR(mregs);
 543                 day = MSTK_REG_DOM(mregs);
 544                 mon = MSTK_REG_MONTH(mregs);
 545                 year = MSTK_CVT_YEAR( MSTK_REG_YEAR(mregs) );
 546         } else if (bregs) {
 547                 unsigned char val = readb(bregs + 0x0e);
 548                 unsigned int century;
 549
 550                 /* BQ4802 RTC chip. */
 551
 552                 writeb(val | 0x08, bregs + 0x0e);
 553
 554                 sec  = readb(bregs + 0x00);
 555                 min  = readb(bregs + 0x02);
 556                 hour = readb(bregs + 0x04);
 557                 day  = readb(bregs + 0x06);
 558                 mon  = readb(bregs + 0x09);
 559                 year = readb(bregs + 0x0a);
 560                 century = readb(bregs + 0x0f);
 561
 562                 writeb(val, bregs + 0x0e);
 563
 564                 BCD_TO_BIN(sec);
 565                 BCD_TO_BIN(min);
 566                 BCD_TO_BIN(hour);
 567                 BCD_TO_BIN(day);
 568                 BCD_TO_BIN(mon);
 569                 BCD_TO_BIN(year);
 570                 BCD_TO_BIN(century);
 571
 572                 year += (century * 100);
 573         } else {
 574                 /* Dallas 12887 RTC chip. */
 575
 576                 do {
 577                         sec  = CMOS_READ(RTC_SECONDS);
 578                         min  = CMOS_READ(RTC_MINUTES);
 579                         hour = CMOS_READ(RTC_HOURS);
 580                         day  = CMOS_READ(RTC_DAY_OF_MONTH);
 581                         mon  = CMOS_READ(RTC_MONTH);
 582                         year = CMOS_READ(RTC_YEAR);
 583                 } while (sec != CMOS_READ(RTC_SECONDS));
 584
 585                 if (!(CMOS_READ(RTC_CONTROL) & RTC_DM_BINARY) || RTC_ALWAYS_BCD) {
 586                         BCD_TO_BIN(sec);
 587                         BCD_TO_BIN(min);
 588                         BCD_TO_BIN(hour);
 589                         BCD_TO_BIN(day);
 590                         BCD_TO_BIN(mon);
 591                         BCD_TO_BIN(year);
 592                 }
 593                 if ((year += 1900) < 1970)
 594                         year += 100;
 595         }
 596
 597         xtime.tv_sec = mktime(year, mon, day, hour, min, sec);
 598         xtime.tv_nsec = (INITIAL_JIFFIES % HZ) * (NSEC_PER_SEC / HZ);
 599         set_normalized_timespec(&wall_to_monotonic,
 600                                 -xtime.tv_sec, -xtime.tv_nsec);
 601
 602         if (mregs) {
 603                 tmp = mostek_read(mregs + MOSTEK_CREG);
 604                 tmp &= ~MSTK_CREG_READ;
 605                 mostek_write(mregs + MOSTEK_CREG, tmp);
 606
 607                 spin_unlock_irq(&mostek_lock);
 608         }
 609 }
 610
 611 /* davem suggests we keep this within the 4M locked kernel image */
 612 static u32 starfire_get_time(void)
 613 {
 614         static char obp_gettod[32];
 615         static u32 unix_tod;
 616
 617         sprintf(obp_gettod, "h# %08x unix-gettod",
 618                 (unsigned int) (long) &unix_tod);
 619         prom_feval(obp_gettod);
 620
 621         return unix_tod;
 622 }
 623
 624 static int starfire_set_time(u32 val)
 625 {
 626         /* Do nothing, time is set using the service processor
 627          * console on this platform.
 628          */
 629         return 0;
 630 }
 631
 632 static u32 hypervisor_get_time(void)
 633 {
 634         unsigned long ret, time;
 635         int retries = 10000;
 636
 637 retry:
 638         ret = sun4v_tod_get(&time);
 639         if (ret == HV_EOK)
 640                 return time;
 641         if (ret == HV_EWOULDBLOCK) {
 642                 if (--retries > 0) {
 643                         udelay(100);
 644                         goto retry;
 645                 }
 646                 printk(KERN_WARNING "SUN4V: tod_get() timed out.\n");
 647                 return 0;
 648         }
 649         printk(KERN_WARNING "SUN4V: tod_get() not supported.\n");
 650         return 0;
 651 }
 652
 653 static int hypervisor_set_time(u32 secs)
 654 {
 655         unsigned long ret;
 656         int retries = 10000;
 657
 658 retry:
 659         ret = sun4v_tod_set(secs);
 660         if (ret == HV_EOK)
 661                 return 0;
 662         if (ret == HV_EWOULDBLOCK) {
 663                 if (--retries > 0) {
 664                         udelay(100);
 665                         goto retry;
 666                 }
 667                 printk(KERN_WARNING "SUN4V: tod_set() timed out.\n");
 668                 return -EAGAIN;
 669         }
 670         printk(KERN_WARNING "SUN4V: tod_set() not supported.\n");
 671         return -EOPNOTSUPP;
 672 }
 673
 674 static int __init clock_model_matches(const char *model)
 675 {
 676         if (strcmp(model, "mk48t02") &&
 677             strcmp(model, "mk48t08") &&
 678             strcmp(model, "mk48t59") &&
 679             strcmp(model, "m5819") &&
 680             strcmp(model, "m5819p") &&
 681             strcmp(model, "m5823") &&
 682             strcmp(model, "ds1287") &&
 683             strcmp(model, "bq4802"))
 684                 return 0;
 685
 686         return 1;
 687 }
 688
 689 static int __devinit clock_probe(struct of_device *op, const struct of_device_id *match)
 690 {
 691         struct device_node *dp = op->node;
 692         const char *model = of_get_property(dp, "model", NULL);
 693         const char *compat = of_get_property(dp, "compatible", NULL);
 694         unsigned long size, flags;
 695         void __iomem *regs;
 696
 697         if (!model)
 698                 model = compat;
 699
 700         if (!model || !clock_model_matches(model))
 701                 return -ENODEV;
 702
 703         /* On an Enterprise system there can be multiple mostek clocks.
 704          * We should only match the one that is on the central FHC bus.
 705          */
 706         if (!strcmp(dp->parent->name, "fhc") &&
 707             strcmp(dp->parent->parent->name, "central") != 0)
 708                 return -ENODEV;
 709
 710         size = (op->resource[0].end - op->resource[0].start) + 1;
 711         regs = of_ioremap(&op->resource[0], 0, size, "clock");
 712         if (!regs)
 713                 return -ENOMEM;
 714
 715 #ifdef CONFIG_PCI
 716         if (!strcmp(model, "ds1287") ||
 717             !strcmp(model, "m5819") ||
 718             !strcmp(model, "m5819p") ||
 719             !strcmp(model, "m5823")) {
 720                 ds1287_regs = (unsigned long) regs;
 721         } else if (!strcmp(model, "bq4802")) {
 722                 bq4802_regs = regs;
 723         } else
 724 #endif
 725         if (model[5] == '0' && model[6] == '2') {
 726                 mstk48t02_regs = regs;
 727         } else if(model[5] == '0' && model[6] == '8') {
 728                 mstk48t08_regs = regs;
 729                 mstk48t02_regs = mstk48t08_regs + MOSTEK_48T08_48T02;
 730         } else {
 731                 mstk48t59_regs = regs;
 732                 mstk48t02_regs = mstk48t59_regs + MOSTEK_48T59_48T02;
 733         }
 734
 735         printk(KERN_INFO "%s: Clock regs at %p\n", dp->full_name, regs);
 736
 737         local_irq_save(flags);
 738
 739         if (mstk48t02_regs != NULL) {
 740                 /* Report a low battery voltage condition. */
 741                 if (has_low_battery())
 742                         prom_printf("NVRAM: Low battery voltage!\n");
 743
 744                 /* Kick start the clock if it is completely stopped. */
 745                 if (mostek_read(mstk48t02_regs + MOSTEK_SEC) & MSTK_STOP)
 746                         kick_start_clock();
 747         }
 748
 749         set_system_time();
 750
 751         local_irq_restore(flags);
 752
 753         return 0;
 754 }
 755
 756 static struct of_device_id clock_match[] = {
 757         {
 758                 .name = "eeprom",
 759         },
 760         {
 761                 .name = "rtc",
 762         },
 763         {},
 764 };
 765
 766 static struct of_platform_driver clock_driver = {
 767         .name           = "clock",
 768         .match_table    = clock_match,
 769         .probe          = clock_probe,
 770 };
 771
 772 static int __init clock_init(void)
 773 {
 774         if (this_is_starfire) {
 775                 xtime.tv_sec = starfire_get_time();
 776                 xtime.tv_nsec = (INITIAL_JIFFIES % HZ) * (NSEC_PER_SEC / HZ);
 777                 set_normalized_timespec(&wall_to_monotonic,
 778                                         -xtime.tv_sec, -xtime.tv_nsec);
 779                 return 0;
 780         }
 781         if (tlb_type == hypervisor) {
 782                 xtime.tv_sec = hypervisor_get_time();
 783                 xtime.tv_nsec = (INITIAL_JIFFIES % HZ) * (NSEC_PER_SEC / HZ);
 784                 set_normalized_timespec(&wall_to_monotonic,
 785                                         -xtime.tv_sec, -xtime.tv_nsec);
 786                 return 0;
 787         }
 788
 789         return of_register_driver(&clock_driver, &of_platform_bus_type);
 790 }
 791
 792 /* Must be after subsys_initcall() so that busses are probed.  Must
 793  * be before device_initcall() because things like the RTC driver
 794  * need to see the clock registers.
 795  */
 796 fs_initcall(clock_init);
 797
 798 /* This is gets the master TICK_INT timer going. */
 799 static unsigned long sparc64_init_timers(void)
 800 {
 801         struct device_node *dp;
 802         unsigned long clock;
 803
 804         dp = of_find_node_by_path("/");
 805         if (tlb_type == spitfire) {
 806                 unsigned long ver, manuf, impl;
 807
 808                 __asm__ __volatile__ ("rdpr %%ver, %0"
 809                                       : "=&r" (ver));
 810                 manuf = ((ver >> 48) & 0xffff);
 811                 impl = ((ver >> 32) & 0xffff);
 812                 if (manuf == 0x17 && impl == 0x13) {
 813                         /* Hummingbird, aka Ultra-IIe */
 814                         tick_ops = &hbtick_operations;
 815                         clock = of_getintprop_default(dp, "stick-frequency", 0);
 816                 } else {
 817                         tick_ops = &tick_operations;
 818                         clock = local_cpu_data().clock_tick;
 819                 }
 820         } else {
 821                 tick_ops = &stick_operations;
 822                 clock = of_getintprop_default(dp, "stick-frequency", 0);
 823         }
 824
 825         return clock;
 826 }
 827
 828 struct freq_table {
 829         unsigned long clock_tick_ref;
 830         unsigned int ref_freq;
 831 };
 832 static DEFINE_PER_CPU(struct freq_table, sparc64_freq_table) = { 0, 0 };
 833
 834 unsigned long sparc64_get_clock_tick(unsigned int cpu)
 835 {
 836         struct freq_table *ft = &per_cpu(sparc64_freq_table, cpu);
 837
 838         if (ft->clock_tick_ref)
 839                 return ft->clock_tick_ref;
 840         return cpu_data(cpu).clock_tick;
 841 }
 842
 843 #ifdef CONFIG_CPU_FREQ
 844
 845 static int sparc64_cpufreq_notifier(struct notifier_block *nb, unsigned long val,
 846                                     void *data)
 847 {
 848         struct cpufreq_freqs *freq = data;
 849         unsigned int cpu = freq->cpu;
 850         struct freq_table *ft = &per_cpu(sparc64_freq_table, cpu);
 851
 852         if (!ft->ref_freq) {
 853                 ft->ref_freq = freq->old;
 854                 ft->clock_tick_ref = cpu_data(cpu).clock_tick;
 855         }
 856         if ((val == CPUFREQ_PRECHANGE  && freq->old < freq->new) ||
 857             (val == CPUFREQ_POSTCHANGE && freq->old > freq->new) ||
 858             (val == CPUFREQ_RESUMECHANGE)) {
 859                 cpu_data(cpu).clock_tick =
 860                         cpufreq_scale(ft->clock_tick_ref,
 861                                       ft->ref_freq,
 862                                       freq->new);
 863         }
 864
 865         return 0;
 866 }
 867
 868 static struct notifier_block sparc64_cpufreq_notifier_block = {
 869         .notifier_call  = sparc64_cpufreq_notifier
 870 };
 871
 872 #endif /* CONFIG_CPU_FREQ */
 873
 874 static int sparc64_next_event(unsigned long delta,
 875                               struct clock_event_device *evt)
 876 {
 877         return tick_ops->add_compare(delta) ? -ETIME : 0;
 878 }
 879
 880 static void sparc64_timer_setup(enum clock_event_mode mode,
 881                                 struct clock_event_device *evt)
 882 {
 883         switch (mode) {
 884         case CLOCK_EVT_MODE_ONESHOT:
 885         case CLOCK_EVT_MODE_RESUME:
 886                 break;
 887
 888         case CLOCK_EVT_MODE_SHUTDOWN:
 889                 tick_ops->disable_irq();
 890                 break;
 891
 892         case CLOCK_EVT_MODE_PERIODIC:
 893         case CLOCK_EVT_MODE_UNUSED:
 894                 WARN_ON(1);
 895                 break;
 896         };
 897 }
 898
 899 static struct clock_event_device sparc64_clockevent = {
 900         .features       = CLOCK_EVT_FEAT_ONESHOT,
 901         .set_mode       = sparc64_timer_setup,
 902         .set_next_event = sparc64_next_event,
 903         .rating         = 100,
 904         .shift          = 30,
 905         .irq            = -1,
 906 };
 907 static DEFINE_PER_CPU(struct clock_event_device, sparc64_events);
 908
 909 void timer_interrupt(int irq, struct pt_regs *regs)
 910 {
 911         struct pt_regs *old_regs = set_irq_regs(regs);
 912         unsigned long tick_mask = tick_ops->softint_mask;
 913         int cpu = smp_processor_id();
 914         struct clock_event_device *evt = &per_cpu(sparc64_events, cpu);
 915
 916         clear_softint(tick_mask);
 917
 918         irq_enter();
 919
 920         kstat_this_cpu.irqs[0]++;
 921
 922         if (unlikely(!evt->event_handler)) {
 923                 printk(KERN_WARNING
 924                        "Spurious SPARC64 timer interrupt on cpu %d\n", cpu);
 925         } else
 926                 evt->event_handler(evt);
 927
 928         irq_exit();
 929
 930         set_irq_regs(old_regs);
 931 }
 932
 933 void __devinit setup_sparc64_timer(void)
 934 {
 935         struct clock_event_device *sevt;
 936         unsigned long pstate;
 937
 938         /* Guarantee that the following sequences execute
 939          * uninterrupted.
 940          */
 941         __asm__ __volatile__("rdpr      %%pstate, %0\n\t"
 942                              "wrpr      %0, %1, %%pstate"
 943                              : "=r" (pstate)
 944                              : "i" (PSTATE_IE));
 945
 946         tick_ops->init_tick();
 947
 948         /* Restore PSTATE_IE. */
 949         __asm__ __volatile__("wrpr      %0, 0x0, %%pstate"
 950                              : /* no outputs */
 951                              : "r" (pstate));
 952
 953         sevt = &__get_cpu_var(sparc64_events);
 954
 955         memcpy(sevt, &sparc64_clockevent, sizeof(*sevt));
 956         sevt->cpumask = cpumask_of_cpu(smp_processor_id());
 957
 958         clockevents_register_device(sevt);
 959 }
 960
 961 #define SPARC64_NSEC_PER_CYC_SHIFT      10UL
 962
 963 static struct clocksource clocksource_tick = {
 964         .rating         = 100,
 965         .mask           = CLOCKSOURCE_MASK(64),
 966         .shift          = 16,
 967         .flags          = CLOCK_SOURCE_IS_CONTINUOUS,
 968 };
 969
 970 static void __init setup_clockevent_multiplier(unsigned long hz)
 971 {
 972         unsigned long mult, shift = 32;
 973
 974         while (1) {
 975                 mult = div_sc(hz, NSEC_PER_SEC, shift);
 976                 if (mult && (mult >> 32UL) == 0UL)
 977                         break;
 978
 979                 shift--;
 980         }
 981
 982         sparc64_clockevent.shift = shift;
 983         sparc64_clockevent.mult = mult;
 984 }
 985
 986 static unsigned long tb_ticks_per_usec __read_mostly;
 987
 988 void __delay(unsigned long loops)
 989 {
 990         unsigned long bclock, now;
 991
 992         bclock = tick_ops->get_tick();
 993         do {
 994                 now = tick_ops->get_tick();
 995         } while ((now-bclock) < loops);
 996 }
 997 EXPORT_SYMBOL(__delay);
 998
 999 void udelay(unsigned long usecs)
1000 {
1001         __delay(tb_ticks_per_usec * usecs);
1002 }
1003 EXPORT_SYMBOL(udelay);
1004
1005 void __init time_init(void)
1006 {
1007         unsigned long clock = sparc64_init_timers();
1008
1009         tb_ticks_per_usec = clock / USEC_PER_SEC;
1010
1011         timer_ticks_per_nsec_quotient =
1012                 clocksource_hz2mult(clock, SPARC64_NSEC_PER_CYC_SHIFT);
1013
1014         clocksource_tick.name = tick_ops->name;
1015         clocksource_tick.mult =
1016                 clocksource_hz2mult(clock,
1017                                     clocksource_tick.shift);
1018         clocksource_tick.read = tick_ops->get_tick;
1019
1020         printk("clocksource: mult[%x] shift[%d]\n",
1021                clocksource_tick.mult, clocksource_tick.shift);
1022
1023         clocksource_register(&clocksource_tick);
1024
1025         sparc64_clockevent.name = tick_ops->name;
1026
1027         setup_clockevent_multiplier(clock);
1028
1029         sparc64_clockevent.max_delta_ns =
1030                 clockevent_delta2ns(0x7fffffffffffffff, &sparc64_clockevent);
1031         sparc64_clockevent.min_delta_ns =
1032                 clockevent_delta2ns(0xF, &sparc64_clockevent);
1033
1034         printk("clockevent: mult[%lx] shift[%d]\n",
1035                sparc64_clockevent.mult, sparc64_clockevent.shift);
1036
1037         setup_sparc64_timer();
1038
1039 #ifdef CONFIG_CPU_FREQ
1040         cpufreq_register_notifier(&sparc64_cpufreq_notifier_block,
1041                                   CPUFREQ_TRANSITION_NOTIFIER);
1042 #endif
1043 }
1044
1045 unsigned long long sched_clock(void)
1046 {
1047         unsigned long ticks = tick_ops->get_tick();
1048
1049         return (ticks * timer_ticks_per_nsec_quotient)
1050                 >> SPARC64_NSEC_PER_CYC_SHIFT;
1051 }
1052
1053 static int set_rtc_mmss(unsigned long nowtime)
1054 {
1055         int real_seconds, real_minutes, chip_minutes;
1056         void __iomem *mregs = mstk48t02_regs;
1057 #ifdef CONFIG_PCI
1058         unsigned long dregs = ds1287_regs;
1059         void __iomem *bregs = bq4802_regs;
1060 #else
1061         unsigned long dregs = 0UL;
1062         void __iomem *bregs = 0UL;
1063 #endif
1064         unsigned long flags;
1065         u8 tmp;
1066
1067         /*
1068          * Not having a register set can lead to trouble.
1069          * Also starfire doesn't have a tod clock.
1070          */
1071         if (!mregs && !dregs & !bregs)
1072                 return -1;
1073
1074         if (mregs) {
1075                 spin_lock_irqsave(&mostek_lock, flags);
1076
1077                 /* Read the current RTC minutes. */
1078                 tmp = mostek_read(mregs + MOSTEK_CREG);
1079                 tmp |= MSTK_CREG_READ;
1080                 mostek_write(mregs + MOSTEK_CREG, tmp);
1081
1082                 chip_minutes = MSTK_REG_MIN(mregs);
1083
1084                 tmp = mostek_read(mregs + MOSTEK_CREG);
1085                 tmp &= ~MSTK_CREG_READ;
1086                 mostek_write(mregs + MOSTEK_CREG, tmp);
1087
1088                 /*
1089                  * since we're only adjusting minutes and seconds,
1090                  * don't interfere with hour overflow. This avoids
1091                  * messing with unknown time zones but requires your
1092                  * RTC not to be off by more than 15 minutes
1093                  */
1094                 real_seconds = nowtime % 60;
1095                 real_minutes = nowtime / 60;
1096                 if (((abs(real_minutes - chip_minutes) + 15)/30) & 1)
1097                         real_minutes += 30;     /* correct for half hour time zone */
1098                 real_minutes %= 60;
1099
1100                 if (abs(real_minutes - chip_minutes) < 30) {
1101                         tmp = mostek_read(mregs + MOSTEK_CREG);
1102                         tmp |= MSTK_CREG_WRITE;
1103                         mostek_write(mregs + MOSTEK_CREG, tmp);
1104
1105                         MSTK_SET_REG_SEC(mregs,real_seconds);
1106                         MSTK_SET_REG_MIN(mregs,real_minutes);
1107
1108                         tmp = mostek_read(mregs + MOSTEK_CREG);
1109                         tmp &= ~MSTK_CREG_WRITE;
1110                         mostek_write(mregs + MOSTEK_CREG, tmp);
1111
1112                         spin_unlock_irqrestore(&mostek_lock, flags);
1113
1114                         return 0;
1115                 } else {
1116                         spin_unlock_irqrestore(&mostek_lock, flags);
1117
1118                         return -1;
1119                 }
1120         } else if (bregs) {
1121                 int retval = 0;
1122                 unsigned char val = readb(bregs + 0x0e);
1123
1124                 /* BQ4802 RTC chip. */
1125
1126                 writeb(val | 0x08, bregs + 0x0e);
1127
1128                 chip_minutes = readb(bregs + 0x02);
1129                 BCD_TO_BIN(chip_minutes);
1130                 real_seconds = nowtime % 60;
1131                 real_minutes = nowtime / 60;
1132                 if (((abs(real_minutes - chip_minutes) + 15)/30) & 1)
1133                         real_minutes += 30;
1134                 real_minutes %= 60;
1135
1136                 if (abs(real_minutes - chip_minutes) < 30) {
1137                         BIN_TO_BCD(real_seconds);
1138                         BIN_TO_BCD(real_minutes);
1139                         writeb(real_seconds, bregs + 0x00);
1140                         writeb(real_minutes, bregs + 0x02);
1141                 } else {
1142                         printk(KERN_WARNING
1143                                "set_rtc_mmss: can't update from %d to %d\n",
1144                                chip_minutes, real_minutes);
1145                         retval = -1;
1146                 }
1147
1148                 writeb(val, bregs + 0x0e);
1149
1150                 return retval;
1151         } else {
1152                 int retval = 0;
1153                 unsigned char save_control, save_freq_select;
1154
1155                 /* Stolen from arch/i386/kernel/time.c, see there for
1156                  * credits and descriptive comments.
1157                  */
1158                 spin_lock_irqsave(&rtc_lock, flags);
1159                 save_control = CMOS_READ(RTC_CONTROL); /* tell the clock it's being set */
1160                 CMOS_WRITE((save_control|RTC_SET), RTC_CONTROL);
1161
1162                 save_freq_select = CMOS_READ(RTC_FREQ_SELECT); /* stop and reset prescaler */
1163                 CMOS_WRITE((save_freq_select|RTC_DIV_RESET2), RTC_FREQ_SELECT);
1164
1165                 chip_minutes = CMOS_READ(RTC_MINUTES);
1166                 if (!(save_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD)
1167                         BCD_TO_BIN(chip_minutes);
1168                 real_seconds = nowtime % 60;
1169                 real_minutes = nowtime / 60;
1170                 if (((abs(real_minutes - chip_minutes) + 15)/30) & 1)
1171                         real_minutes += 30;
1172                 real_minutes %= 60;
1173
1174                 if (abs(real_minutes - chip_minutes) < 30) {
1175                         if (!(save_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD) {
1176                                 BIN_TO_BCD(real_seconds);
1177                                 BIN_TO_BCD(real_minutes);
1178                         }
1179                         CMOS_WRITE(real_seconds,RTC_SECONDS);
1180                         CMOS_WRITE(real_minutes,RTC_MINUTES);
1181                 } else {
1182                         printk(KERN_WARNING
1183                                "set_rtc_mmss: can't update from %d to %d\n",
1184                                chip_minutes, real_minutes);
1185                         retval = -1;
1186                 }
1187
1188                 CMOS_WRITE(save_control, RTC_CONTROL);
1189                 CMOS_WRITE(save_freq_select, RTC_FREQ_SELECT);
1190                 spin_unlock_irqrestore(&rtc_lock, flags);
1191
1192                 return retval;
1193         }
1194 }
1195
1196 #define RTC_IS_OPEN             0x01    /* means /dev/rtc is in use     */
1197 static unsigned char mini_rtc_status;   /* bitmapped status byte.       */
1198
1199 #define FEBRUARY        2
1200 #define STARTOFTIME     1970
1201 #define SECDAY          86400L
1202 #define SECYR           (SECDAY * 365)
1203 #define leapyear(year)          ((year) % 4 == 0 && \
1204                                  ((year) % 100 != 0 || (year) % 400 == 0))
1205 #define days_in_year(a)         (leapyear(a) ? 366 : 365)
1206 #define days_in_month(a)        (month_days[(a) - 1])
1207
1208 static int month_days[12] = {
1209         31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
1210 };
1211
1212 /*
1213  * This only works for the Gregorian calendar - i.e. after 1752 (in the UK)
1214  */
1215 static void GregorianDay(struct rtc_time * tm)
1216 {
1217         int leapsToDate;
1218         int lastYear;
1219         int day;
1220         int MonthOffset[] = { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334 };
1221
1222         lastYear = tm->tm_year - 1;
1223
1224         /*
1225          * Number of leap corrections to apply up to end of last year
1226          */
1227         leapsToDate = lastYear / 4 - lastYear / 100 + lastYear / 400;
1228
1229         /*
1230          * This year is a leap year if it is divisible by 4 except when it is
1231          * divisible by 100 unless it is divisible by 400
1232          *
1233          * e.g. 1904 was a leap year, 1900 was not, 1996 is, and 2000 was
1234          */
1235         day = tm->tm_mon > 2 && leapyear(tm->tm_year);
1236
1237         day += lastYear*365 + leapsToDate + MonthOffset[tm->tm_mon-1] +
1238                    tm->tm_mday;
1239
1240         tm->tm_wday = day % 7;
1241 }
1242
1243 static void to_tm(int tim, struct rtc_time *tm)
1244 {
1245         register int    i;
1246         register long   hms, day;
1247
1248         day = tim / SECDAY;
1249         hms = tim % SECDAY;
1250
1251         /* Hours, minutes, seconds are easy */
1252         tm->tm_hour = hms / 3600;
1253         tm->tm_min = (hms % 3600) / 60;
1254         tm->tm_sec = (hms % 3600) % 60;
1255
1256         /* Number of years in days */
1257         for (i = STARTOFTIME; day >= days_in_year(i); i++)
1258                 day -= days_in_year(i);
1259         tm->tm_year = i;
1260
1261         /* Number of months in days left */
1262         if (leapyear(tm->tm_year))
1263                 days_in_month(FEBRUARY) = 29;
1264         for (i = 1; day >= days_in_month(i); i++)
1265                 day -= days_in_month(i);
1266         days_in_month(FEBRUARY) = 28;
1267         tm->tm_mon = i;
1268
1269         /* Days are what is left over (+1) from all that. */
1270         tm->tm_mday = day + 1;
1271
1272         /*
1273          * Determine the day of week
1274          */
1275         GregorianDay(tm);
1276 }
1277
1278 /* Both Starfire and SUN4V give us seconds since Jan 1st, 1970,
1279  * aka Unix time.  So we have to convert to/from rtc_time.
1280  */
1281 static void starfire_get_rtc_time(struct rtc_time *time)
1282 {
1283         u32 seconds = starfire_get_time();
1284
1285         to_tm(seconds, time);
1286         time->tm_year -= 1900;
1287         time->tm_mon -= 1;
1288 }
1289
1290 static int starfire_set_rtc_time(struct rtc_time *time)
1291 {
1292         u32 seconds = mktime(time->tm_year + 1900, time->tm_mon + 1,
1293                              time->tm_mday, time->tm_hour,
1294                              time->tm_min, time->tm_sec);
1295
1296         return starfire_set_time(seconds);
1297 }
1298
1299 static void hypervisor_get_rtc_time(struct rtc_time *time)
1300 {
1301         u32 seconds = hypervisor_get_time();
1302
1303         to_tm(seconds, time);
1304         time->tm_year -= 1900;
1305         time->tm_mon -= 1;
1306 }
1307
1308 static int hypervisor_set_rtc_time(struct rtc_time *time)
1309 {
1310         u32 seconds = mktime(time->tm_year + 1900, time->tm_mon + 1,
1311                              time->tm_mday, time->tm_hour,
1312                              time->tm_min, time->tm_sec);
1313
1314         return hypervisor_set_time(seconds);
1315 }
1316
1317 #ifdef CONFIG_PCI
1318 static void bq4802_get_rtc_time(struct rtc_time *time)
1319 {
1320         unsigned char val = readb(bq4802_regs + 0x0e);
1321         unsigned int century;
1322
1323         writeb(val | 0x08, bq4802_regs + 0x0e);
1324
1325         time->tm_sec = readb(bq4802_regs + 0x00);
1326         time->tm_min = readb(bq4802_regs + 0x02);
1327         time->tm_hour = readb(bq4802_regs + 0x04);
1328         time->tm_mday = readb(bq4802_regs + 0x06);
1329         time->tm_mon = readb(bq4802_regs + 0x09);
1330         time->tm_year = readb(bq4802_regs + 0x0a);
1331         time->tm_wday = readb(bq4802_regs + 0x08);
1332         century = readb(bq4802_regs + 0x0f);
1333
1334         writeb(val, bq4802_regs + 0x0e);
1335
1336         BCD_TO_BIN(time->tm_sec);
1337         BCD_TO_BIN(time->tm_min);
1338         BCD_TO_BIN(time->tm_hour);
1339         BCD_TO_BIN(time->tm_mday);
1340         BCD_TO_BIN(time->tm_mon);
1341         BCD_TO_BIN(time->tm_year);
1342         BCD_TO_BIN(time->tm_wday);
1343         BCD_TO_BIN(century);
1344
1345         time->tm_year += (century * 100);
1346         time->tm_year -= 1900;
1347
1348         time->tm_mon--;
1349 }
1350
1351 static int bq4802_set_rtc_time(struct rtc_time *time)
1352 {
1353         unsigned char val = readb(bq4802_regs + 0x0e);
1354         unsigned char sec, min, hrs, day, mon, yrs, century;
1355         unsigned int year;
1356
1357         year = time->tm_year + 1900;
1358         century = year / 100;
1359         yrs = year % 100;
1360
1361         mon = time->tm_mon + 1;   /* tm_mon starts at zero */
1362         day = time->tm_mday;
1363         hrs = time->tm_hour;
1364         min = time->tm_min;
1365         sec = time->tm_sec;
1366
1367         BIN_TO_BCD(sec);
1368         BIN_TO_BCD(min);
1369         BIN_TO_BCD(hrs);
1370         BIN_TO_BCD(day);
1371         BIN_TO_BCD(mon);
1372         BIN_TO_BCD(yrs);
1373         BIN_TO_BCD(century);
1374
1375         writeb(val | 0x08, bq4802_regs + 0x0e);
1376
1377         writeb(sec, bq4802_regs + 0x00);
1378         writeb(min, bq4802_regs + 0x02);
1379         writeb(hrs, bq4802_regs + 0x04);
1380         writeb(day, bq4802_regs + 0x06);
1381         writeb(mon, bq4802_regs + 0x09);
1382         writeb(yrs, bq4802_regs + 0x0a);
1383         writeb(century, bq4802_regs + 0x0f);
1384
1385         writeb(val, bq4802_regs + 0x0e);
1386
1387         return 0;
1388 }
1389
1390 static void cmos_get_rtc_time(struct rtc_time *rtc_tm)
1391 {
1392         unsigned char ctrl;
1393
1394         rtc_tm->tm_sec = CMOS_READ(RTC_SECONDS);
1395         rtc_tm->tm_min = CMOS_READ(RTC_MINUTES);
1396         rtc_tm->tm_hour = CMOS_READ(RTC_HOURS);
1397         rtc_tm->tm_mday = CMOS_READ(RTC_DAY_OF_MONTH);
1398         rtc_tm->tm_mon = CMOS_READ(RTC_MONTH);
1399         rtc_tm->tm_year = CMOS_READ(RTC_YEAR);
1400         rtc_tm->tm_wday = CMOS_READ(RTC_DAY_OF_WEEK);
1401
1402         ctrl = CMOS_READ(RTC_CONTROL);
1403         if (!(ctrl & RTC_DM_BINARY) || RTC_ALWAYS_BCD) {
1404                 BCD_TO_BIN(rtc_tm->tm_sec);
1405                 BCD_TO_BIN(rtc_tm->tm_min);
1406                 BCD_TO_BIN(rtc_tm->tm_hour);
1407                 BCD_TO_BIN(rtc_tm->tm_mday);
1408                 BCD_TO_BIN(rtc_tm->tm_mon);
1409                 BCD_TO_BIN(rtc_tm->tm_year);
1410                 BCD_TO_BIN(rtc_tm->tm_wday);
1411         }
1412
1413         if (rtc_tm->tm_year <= 69)
1414                 rtc_tm->tm_year += 100;
1415
1416         rtc_tm->tm_mon--;
1417 }
1418
1419 static int cmos_set_rtc_time(struct rtc_time *rtc_tm)
1420 {
1421         unsigned char mon, day, hrs, min, sec;
1422         unsigned char save_control, save_freq_select;
1423         unsigned int yrs;
1424
1425         yrs = rtc_tm->tm_year;
1426         mon = rtc_tm->tm_mon + 1;
1427         day = rtc_tm->tm_mday;
1428         hrs = rtc_tm->tm_hour;
1429         min = rtc_tm->tm_min;
1430         sec = rtc_tm->tm_sec;
1431
1432         if (yrs >= 100)
1433                 yrs -= 100;
1434
1435         if (!(CMOS_READ(RTC_CONTROL) & RTC_DM_BINARY) || RTC_ALWAYS_BCD) {
1436                 BIN_TO_BCD(sec);
1437                 BIN_TO_BCD(min);
1438                 BIN_TO_BCD(hrs);
1439                 BIN_TO_BCD(day);
1440                 BIN_TO_BCD(mon);
1441                 BIN_TO_BCD(yrs);
1442         }
1443
1444         save_control = CMOS_READ(RTC_CONTROL);
1445         CMOS_WRITE((save_control|RTC_SET), RTC_CONTROL);
1446         save_freq_select = CMOS_READ(RTC_FREQ_SELECT);
1447         CMOS_WRITE((save_freq_select|RTC_DIV_RESET2), RTC_FREQ_SELECT);
1448
1449         CMOS_WRITE(yrs, RTC_YEAR);
1450         CMOS_WRITE(mon, RTC_MONTH);
1451         CMOS_WRITE(day, RTC_DAY_OF_MONTH);
1452         CMOS_WRITE(hrs, RTC_HOURS);
1453         CMOS_WRITE(min, RTC_MINUTES);
1454         CMOS_WRITE(sec, RTC_SECONDS);
1455
1456         CMOS_WRITE(save_control, RTC_CONTROL);
1457         CMOS_WRITE(save_freq_select, RTC_FREQ_SELECT);
1458
1459         return 0;
1460 }
1461 #endif /* CONFIG_PCI */
1462
1463 struct mini_rtc_ops {
1464         void (*get_rtc_time)(struct rtc_time *);
1465         int (*set_rtc_time)(struct rtc_time *);
1466 };
1467
1468 static struct mini_rtc_ops starfire_rtc_ops = {
1469         .get_rtc_time = starfire_get_rtc_time,
1470         .set_rtc_time = starfire_set_rtc_time,
1471 };
1472
1473 static struct mini_rtc_ops hypervisor_rtc_ops = {
1474         .get_rtc_time = hypervisor_get_rtc_time,
1475         .set_rtc_time = hypervisor_set_rtc_time,
1476 };
1477
1478 #ifdef CONFIG_PCI
1479 static struct mini_rtc_ops bq4802_rtc_ops = {
1480         .get_rtc_time = bq4802_get_rtc_time,
1481         .set_rtc_time = bq4802_set_rtc_time,
1482 };
1483
1484 static struct mini_rtc_ops cmos_rtc_ops = {
1485         .get_rtc_time = cmos_get_rtc_time,
1486         .set_rtc_time = cmos_set_rtc_time,
1487 };
1488 #endif /* CONFIG_PCI */
1489
1490 static struct mini_rtc_ops *mini_rtc_ops;
1491
1492 static inline void mini_get_rtc_time(struct rtc_time *time)
1493 {
1494         unsigned long flags;
1495
1496         spin_lock_irqsave(&rtc_lock, flags);
1497         mini_rtc_ops->get_rtc_time(time);
1498         spin_unlock_irqrestore(&rtc_lock, flags);
1499 }
1500
1501 static inline int mini_set_rtc_time(struct rtc_time *time)
1502 {
1503         unsigned long flags;
1504         int err;
1505
1506         spin_lock_irqsave(&rtc_lock, flags);
1507         err = mini_rtc_ops->set_rtc_time(time);
1508         spin_unlock_irqrestore(&rtc_lock, flags);
1509
1510         return err;
1511 }
1512
1513 static int mini_rtc_ioctl(struct inode *inode, struct file *file,
1514                           unsigned int cmd, unsigned long arg)
1515 {
1516         struct rtc_time wtime;
1517         void __user *argp = (void __user *)arg;
1518
1519         switch (cmd) {
1520
1521         case RTC_PLL_GET:
1522                 return -EINVAL;
1523
1524         case RTC_PLL_SET:
1525                 return -EINVAL;
1526
1527         case RTC_UIE_OFF:       /* disable ints from RTC updates.       */
1528                 return 0;
1529
1530         case RTC_UIE_ON:        /* enable ints for RTC updates. */
1531                 return -EINVAL;
1532
1533         case RTC_RD_TIME:       /* Read the time/date from RTC  */
1534                 /* this doesn't get week-day, who cares */
1535                 memset(&wtime, 0, sizeof(wtime));
1536                 mini_get_rtc_time(&wtime);
1537
1538                 return copy_to_user(argp, &wtime, sizeof(wtime)) ? -EFAULT : 0;
1539
1540         case RTC_SET_TIME:      /* Set the RTC */
1541             {
1542                 int year, days;
1543
1544                 if (!capable(CAP_SYS_TIME))
1545                         return -EACCES;
1546
1547                 if (copy_from_user(&wtime, argp, sizeof(wtime)))
1548                         return -EFAULT;
1549
1550                 year = wtime.tm_year + 1900;
1551                 days = month_days[wtime.tm_mon] +
1552                        ((wtime.tm_mon == 1) && leapyear(year));
1553
1554                 if ((wtime.tm_mon < 0 || wtime.tm_mon > 11) ||
1555                     (wtime.tm_mday < 1))
1556                         return -EINVAL;
1557
1558                 if (wtime.tm_mday < 0 || wtime.tm_mday > days)
1559                         return -EINVAL;
1560
1561                 if (wtime.tm_hour < 0 || wtime.tm_hour >= 24 ||
1562                     wtime.tm_min < 0 || wtime.tm_min >= 60 ||
1563                     wtime.tm_sec < 0 || wtime.tm_sec >= 60)
1564                         return -EINVAL;
1565
1566                 return mini_set_rtc_time(&wtime);
1567             }
1568         }
1569
1570         return -EINVAL;
1571 }
1572
1573 static int mini_rtc_open(struct inode *inode, struct file *file)
1574 {
1575         if (mini_rtc_status & RTC_IS_OPEN)
1576                 return -EBUSY;
1577
1578         mini_rtc_status |= RTC_IS_OPEN;
1579
1580         return 0;
1581 }
1582
1583 static int mini_rtc_release(struct inode *inode, struct file *file)
1584 {
1585         mini_rtc_status &= ~RTC_IS_OPEN;
1586         return 0;
1587 }
1588
1589
1590 static const struct file_operations mini_rtc_fops = {
1591         .owner          = THIS_MODULE,
1592         .ioctl          = mini_rtc_ioctl,
1593         .open           = mini_rtc_open,
1594         .release        = mini_rtc_release,
1595 };
1596
1597 static struct miscdevice rtc_mini_dev =
1598 {
1599         .minor          = RTC_MINOR,
1600         .name           = "rtc",
1601         .fops           = &mini_rtc_fops,
1602 };
1603
1604 static int __init rtc_mini_init(void)
1605 {
1606         int retval;
1607
1608         if (tlb_type == hypervisor)
1609                 mini_rtc_ops = &hypervisor_rtc_ops;
1610         else if (this_is_starfire)
1611                 mini_rtc_ops = &starfire_rtc_ops;
1612 #ifdef CONFIG_PCI
1613         else if (bq4802_regs)
1614                 mini_rtc_ops = &bq4802_rtc_ops;
1615         else if (ds1287_regs)
1616                 mini_rtc_ops = &cmos_rtc_ops;
1617 #endif /* CONFIG_PCI */
1618         else
1619                 return -ENODEV;
1620
1621         printk(KERN_INFO "Mini RTC Driver\n");
1622
1623         retval = misc_register(&rtc_mini_dev);
1624         if (retval < 0)
1625                 return retval;
1626
1627         return 0;
1628 }
1629
1630 static void __exit rtc_mini_exit(void)
1631 {
1632         misc_deregister(&rtc_mini_dev);
1633 }
1634
1635
1636 module_init(rtc_mini_init);
1637 module_exit(rtc_mini_exit);