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   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/config.h>
  13 #include <linux/errno.h>
  14 #include <linux/module.h>
  15 #include <linux/sched.h>
  16 #include <linux/kernel.h>
  17 #include <linux/param.h>
  18 #include <linux/string.h>
  19 #include <linux/mm.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/time.h>
  22 #include <linux/timex.h>
  23 #include <linux/init.h>
  24 #include <linux/ioport.h>
  25 #include <linux/mc146818rtc.h>
  26 #include <linux/delay.h>
  27 #include <linux/profile.h>
  28 #include <linux/bcd.h>
  29 #include <linux/jiffies.h>
  30 #include <linux/cpufreq.h>
  31 #include <linux/percpu.h>
  32 #include <linux/profile.h>
  33
  34 #include <asm/oplib.h>
  35 #include <asm/mostek.h>
  36 #include <asm/timer.h>
  37 #include <asm/irq.h>
  38 #include <asm/io.h>
  39 #include <asm/sbus.h>
  40 #include <asm/fhc.h>
  41 #include <asm/pbm.h>
  42 #include <asm/ebus.h>
  43 #include <asm/isa.h>
  44 #include <asm/starfire.h>
  45 #include <asm/smp.h>
  46 #include <asm/sections.h>
  47 #include <asm/cpudata.h>
  48
  49 DEFINE_SPINLOCK(mostek_lock);
  50 DEFINE_SPINLOCK(rtc_lock);
  51 void * __iomem mstk48t02_regs = 0UL;
  52 #ifdef CONFIG_PCI
  53 unsigned long ds1287_regs = 0UL;
  54 #endif
  55
  56 extern unsigned long wall_jiffies;
  57
  58 u64 jiffies_64 = INITIAL_JIFFIES;
  59
  60 EXPORT_SYMBOL(jiffies_64);
  61
  62 static void * __iomem mstk48t08_regs;
  63 static void * __iomem mstk48t59_regs;
  64
  65 static int set_rtc_mmss(unsigned long);
  66
  67 static __init unsigned long dummy_get_tick(void)
  68 {
  69         return 0;
  70 }
  71
  72 static __initdata struct sparc64_tick_ops dummy_tick_ops = {
  73         .get_tick       = dummy_get_tick,
  74 };
  75
  76 struct sparc64_tick_ops *tick_ops = &dummy_tick_ops;
  77
  78 #define TICK_PRIV_BIT   (1UL << 63)
  79
  80 #ifdef CONFIG_SMP
  81 unsigned long profile_pc(struct pt_regs *regs)
  82 {
  83         unsigned long pc = instruction_pointer(regs);
  84
  85         if (in_lock_functions(pc))
  86                 return regs->u_regs[UREG_RETPC];
  87         return pc;
  88 }
  89 EXPORT_SYMBOL(profile_pc);
  90 #endif
  91
  92 static void tick_disable_protection(void)
  93 {
  94         /* Set things up so user can access tick register for profiling
  95          * purposes.  Also workaround BB_ERRATA_1 by doing a dummy
  96          * read back of %tick after writing it.
  97          */
  98         __asm__ __volatile__(
  99         "       ba,pt   %%xcc, 1f\n"
 100         "        nop\n"
 101         "       .align  64\n"
 102         "1:     rd      %%tick, %%g2\n"
 103         "       add     %%g2, 6, %%g2\n"
 104         "       andn    %%g2, %0, %%g2\n"
 105         "       wrpr    %%g2, 0, %%tick\n"
 106         "       rdpr    %%tick, %%g0"
 107         : /* no outputs */
 108         : "r" (TICK_PRIV_BIT)
 109         : "g2");
 110 }
 111
 112 static void tick_init_tick(unsigned long offset)
 113 {
 114         tick_disable_protection();
 115
 116         __asm__ __volatile__(
 117         "       rd      %%tick, %%g1\n"
 118         "       andn    %%g1, %1, %%g1\n"
 119         "       ba,pt   %%xcc, 1f\n"
 120         "        add    %%g1, %0, %%g1\n"
 121         "       .align  64\n"
 122         "1:     wr      %%g1, 0x0, %%tick_cmpr\n"
 123         "       rd      %%tick_cmpr, %%g0"
 124         : /* no outputs */
 125         : "r" (offset), "r" (TICK_PRIV_BIT)
 126         : "g1");
 127 }
 128
 129 static unsigned long tick_get_tick(void)
 130 {
 131         unsigned long ret;
 132
 133         __asm__ __volatile__("rd        %%tick, %0\n\t"
 134                              "mov       %0, %0"
 135                              : "=r" (ret));
 136
 137         return ret & ~TICK_PRIV_BIT;
 138 }
 139
 140 static unsigned long tick_get_compare(void)
 141 {
 142         unsigned long ret;
 143
 144         __asm__ __volatile__("rd        %%tick_cmpr, %0\n\t"
 145                              "mov       %0, %0"
 146                              : "=r" (ret));
 147
 148         return ret;
 149 }
 150
 151 static unsigned long tick_add_compare(unsigned long adj)
 152 {
 153         unsigned long new_compare;
 154
 155         /* Workaround for Spitfire Errata (#54 I think??), I discovered
 156          * this via Sun BugID 4008234, mentioned in Solaris-2.5.1 patch
 157          * number 103640.
 158          *
 159          * On Blackbird writes to %tick_cmpr can fail, the
 160          * workaround seems to be to execute the wr instruction
 161          * at the start of an I-cache line, and perform a dummy
 162          * read back from %tick_cmpr right after writing to it. -DaveM
 163          */
 164         __asm__ __volatile__("rd        %%tick_cmpr, %0\n\t"
 165                              "ba,pt     %%xcc, 1f\n\t"
 166                              " add      %0, %1, %0\n\t"
 167                              ".align    64\n"
 168                              "1:\n\t"
 169                              "wr        %0, 0, %%tick_cmpr\n\t"
 170                              "rd        %%tick_cmpr, %%g0"
 171                              : "=&r" (new_compare)
 172                              : "r" (adj));
 173
 174         return new_compare;
 175 }
 176
 177 static unsigned long tick_add_tick(unsigned long adj, unsigned long offset)
 178 {
 179         unsigned long new_tick, tmp;
 180
 181         /* Also need to handle Blackbird bug here too. */
 182         __asm__ __volatile__("rd        %%tick, %0\n\t"
 183                              "add       %0, %2, %0\n\t"
 184                              "wrpr      %0, 0, %%tick\n\t"
 185                              "andn      %0, %4, %1\n\t"
 186                              "ba,pt     %%xcc, 1f\n\t"
 187                              " add      %1, %3, %1\n\t"
 188                              ".align    64\n"
 189                              "1:\n\t"
 190                              "wr        %1, 0, %%tick_cmpr\n\t"
 191                              "rd        %%tick_cmpr, %%g0"
 192                              : "=&r" (new_tick), "=&r" (tmp)
 193                              : "r" (adj), "r" (offset), "r" (TICK_PRIV_BIT));
 194
 195         return new_tick;
 196 }
 197
 198 static struct sparc64_tick_ops tick_operations = {
 199         .init_tick      =       tick_init_tick,
 200         .get_tick       =       tick_get_tick,
 201         .get_compare    =       tick_get_compare,
 202         .add_tick       =       tick_add_tick,
 203         .add_compare    =       tick_add_compare,
 204         .softint_mask   =       1UL << 0,
 205 };
 206
 207 static void stick_init_tick(unsigned long offset)
 208 {
 209         tick_disable_protection();
 210
 211         /* Let the user get at STICK too. */
 212         __asm__ __volatile__(
 213         "       rd      %%asr24, %%g2\n"
 214         "       andn    %%g2, %0, %%g2\n"
 215         "       wr      %%g2, 0, %%asr24"
 216         : /* no outputs */
 217         : "r" (TICK_PRIV_BIT)
 218         : "g1", "g2");
 219
 220         __asm__ __volatile__(
 221         "       rd      %%asr24, %%g1\n"
 222         "       andn    %%g1, %1, %%g1\n"
 223         "       add     %%g1, %0, %%g1\n"
 224         "       wr      %%g1, 0x0, %%asr25"
 225         : /* no outputs */
 226         : "r" (offset), "r" (TICK_PRIV_BIT)
 227         : "g1");
 228 }
 229
 230 static unsigned long stick_get_tick(void)
 231 {
 232         unsigned long ret;
 233
 234         __asm__ __volatile__("rd        %%asr24, %0"
 235                              : "=r" (ret));
 236
 237         return ret & ~TICK_PRIV_BIT;
 238 }
 239
 240 static unsigned long stick_get_compare(void)
 241 {
 242         unsigned long ret;
 243
 244         __asm__ __volatile__("rd        %%asr25, %0"
 245                              : "=r" (ret));
 246
 247         return ret;
 248 }
 249
 250 static unsigned long stick_add_tick(unsigned long adj, unsigned long offset)
 251 {
 252         unsigned long new_tick, tmp;
 253
 254         __asm__ __volatile__("rd        %%asr24, %0\n\t"
 255                              "add       %0, %2, %0\n\t"
 256                              "wr        %0, 0, %%asr24\n\t"
 257                              "andn      %0, %4, %1\n\t"
 258                              "add       %1, %3, %1\n\t"
 259                              "wr        %1, 0, %%asr25"
 260                              : "=&r" (new_tick), "=&r" (tmp)
 261                              : "r" (adj), "r" (offset), "r" (TICK_PRIV_BIT));
 262
 263         return new_tick;
 264 }
 265
 266 static unsigned long stick_add_compare(unsigned long adj)
 267 {
 268         unsigned long new_compare;
 269
 270         __asm__ __volatile__("rd        %%asr25, %0\n\t"
 271                              "add       %0, %1, %0\n\t"
 272                              "wr        %0, 0, %%asr25"
 273                              : "=&r" (new_compare)
 274                              : "r" (adj));
 275
 276         return new_compare;
 277 }
 278
 279 static struct sparc64_tick_ops stick_operations = {
 280         .init_tick      =       stick_init_tick,
 281         .get_tick       =       stick_get_tick,
 282         .get_compare    =       stick_get_compare,
 283         .add_tick       =       stick_add_tick,
 284         .add_compare    =       stick_add_compare,
 285         .softint_mask   =       1UL << 16,
 286 };
 287
 288 /* On Hummingbird the STICK/STICK_CMPR register is implemented
 289  * in I/O space.  There are two 64-bit registers each, the
 290  * first holds the low 32-bits of the value and the second holds
 291  * the high 32-bits.
 292  *
 293  * Since STICK is constantly updating, we have to access it carefully.
 294  *
 295  * The sequence we use to read is:
 296  * 1) read low
 297  * 2) read high
 298  * 3) read low again, if it rolled over increment high by 1
 299  *
 300  * Writing STICK safely is also tricky:
 301  * 1) write low to zero
 302  * 2) write high
 303  * 3) write low
 304  */
 305 #define HBIRD_STICKCMP_ADDR     0x1fe0000f060UL
 306 #define HBIRD_STICK_ADDR        0x1fe0000f070UL
 307
 308 static unsigned long __hbird_read_stick(void)
 309 {
 310         unsigned long ret, tmp1, tmp2, tmp3;
 311         unsigned long addr = HBIRD_STICK_ADDR;
 312
 313         __asm__ __volatile__("ldxa      [%1] %5, %2\n\t"
 314                              "add       %1, 0x8, %1\n\t"
 315                              "ldxa      [%1] %5, %3\n\t"
 316                              "sub       %1, 0x8, %1\n\t"
 317                              "ldxa      [%1] %5, %4\n\t"
 318                              "cmp       %4, %2\n\t"
 319                              "blu,a,pn  %%xcc, 1f\n\t"
 320                              " add      %3, 1, %3\n"
 321                              "1:\n\t"
 322                              "sllx      %3, 32, %3\n\t"
 323                              "or        %3, %4, %0\n\t"
 324                              : "=&r" (ret), "=&r" (addr),
 325                                "=&r" (tmp1), "=&r" (tmp2), "=&r" (tmp3)
 326                              : "i" (ASI_PHYS_BYPASS_EC_E), "1" (addr));
 327
 328         return ret;
 329 }
 330
 331 static unsigned long __hbird_read_compare(void)
 332 {
 333         unsigned long low, high;
 334         unsigned long addr = HBIRD_STICKCMP_ADDR;
 335
 336         __asm__ __volatile__("ldxa      [%2] %3, %0\n\t"
 337                              "add       %2, 0x8, %2\n\t"
 338                              "ldxa      [%2] %3, %1"
 339                              : "=&r" (low), "=&r" (high), "=&r" (addr)
 340                              : "i" (ASI_PHYS_BYPASS_EC_E), "2" (addr));
 341
 342         return (high << 32UL) | low;
 343 }
 344
 345 static void __hbird_write_stick(unsigned long val)
 346 {
 347         unsigned long low = (val & 0xffffffffUL);
 348         unsigned long high = (val >> 32UL);
 349         unsigned long addr = HBIRD_STICK_ADDR;
 350
 351         __asm__ __volatile__("stxa      %%g0, [%0] %4\n\t"
 352                              "add       %0, 0x8, %0\n\t"
 353                              "stxa      %3, [%0] %4\n\t"
 354                              "sub       %0, 0x8, %0\n\t"
 355                              "stxa      %2, [%0] %4"
 356                              : "=&r" (addr)
 357                              : "0" (addr), "r" (low), "r" (high),
 358                                "i" (ASI_PHYS_BYPASS_EC_E));
 359 }
 360
 361 static void __hbird_write_compare(unsigned long val)
 362 {
 363         unsigned long low = (val & 0xffffffffUL);
 364         unsigned long high = (val >> 32UL);
 365         unsigned long addr = HBIRD_STICKCMP_ADDR + 0x8UL;
 366
 367         __asm__ __volatile__("stxa      %3, [%0] %4\n\t"
 368                              "sub       %0, 0x8, %0\n\t"
 369                              "stxa      %2, [%0] %4"
 370                              : "=&r" (addr)
 371                              : "0" (addr), "r" (low), "r" (high),
 372                                "i" (ASI_PHYS_BYPASS_EC_E));
 373 }
 374
 375 static void hbtick_init_tick(unsigned long offset)
 376 {
 377         unsigned long val;
 378
 379         tick_disable_protection();
 380
 381         /* XXX This seems to be necessary to 'jumpstart' Hummingbird
 382          * XXX into actually sending STICK interrupts.  I think because
 383          * XXX of how we store %tick_cmpr in head.S this somehow resets the
 384          * XXX {TICK + STICK} interrupt mux.  -DaveM
 385          */
 386         __hbird_write_stick(__hbird_read_stick());
 387
 388         val = __hbird_read_stick() & ~TICK_PRIV_BIT;
 389         __hbird_write_compare(val + offset);
 390 }
 391
 392 static unsigned long hbtick_get_tick(void)
 393 {
 394         return __hbird_read_stick() & ~TICK_PRIV_BIT;
 395 }
 396
 397 static unsigned long hbtick_get_compare(void)
 398 {
 399         return __hbird_read_compare();
 400 }
 401
 402 static unsigned long hbtick_add_tick(unsigned long adj, unsigned long offset)
 403 {
 404         unsigned long val;
 405
 406         val = __hbird_read_stick() + adj;
 407         __hbird_write_stick(val);
 408
 409         val &= ~TICK_PRIV_BIT;
 410         __hbird_write_compare(val + offset);
 411
 412         return val;
 413 }
 414
 415 static unsigned long hbtick_add_compare(unsigned long adj)
 416 {
 417         unsigned long val = __hbird_read_compare() + adj;
 418
 419         val &= ~TICK_PRIV_BIT;
 420         __hbird_write_compare(val);
 421
 422         return val;
 423 }
 424
 425 static struct sparc64_tick_ops hbtick_operations = {
 426         .init_tick      =       hbtick_init_tick,
 427         .get_tick       =       hbtick_get_tick,
 428         .get_compare    =       hbtick_get_compare,
 429         .add_tick       =       hbtick_add_tick,
 430         .add_compare    =       hbtick_add_compare,
 431         .softint_mask   =       1UL << 0,
 432 };
 433
 434 /* timer_interrupt() needs to keep up the real-time clock,
 435  * as well as call the "do_timer()" routine every clocktick
 436  *
 437  * NOTE: On SUN5 systems the ticker interrupt comes in using 2
 438  *       interrupts, one at level14 and one with softint bit 0.
 439  */
 440 unsigned long timer_tick_offset;
 441 unsigned long timer_tick_compare;
 442
 443 static unsigned long timer_ticks_per_nsec_quotient;
 444
 445 #define TICK_SIZE (tick_nsec / 1000)
 446
 447 static inline void timer_check_rtc(void)
 448 {
 449         /* last time the cmos clock got updated */
 450         static long last_rtc_update;
 451
 452         /* Determine when to update the Mostek clock. */
 453         if ((time_status & STA_UNSYNC) == 0 &&
 454             xtime.tv_sec > last_rtc_update + 660 &&
 455             (xtime.tv_nsec / 1000) >= 500000 - ((unsigned) TICK_SIZE) / 2 &&
 456             (xtime.tv_nsec / 1000) <= 500000 + ((unsigned) TICK_SIZE) / 2) {
 457                 if (set_rtc_mmss(xtime.tv_sec) == 0)
 458                         last_rtc_update = xtime.tv_sec;
 459                 else
 460                         last_rtc_update = xtime.tv_sec - 600;
 461                         /* do it again in 60 s */
 462         }
 463 }
 464
 465 static irqreturn_t timer_interrupt(int irq, void *dev_id, struct pt_regs * regs)
 466 {
 467         unsigned long ticks, pstate;
 468
 469         write_seqlock(&xtime_lock);
 470
 471         do {
 472 #ifndef CONFIG_SMP
 473                 profile_tick(CPU_PROFILING, regs);
 474                 update_process_times(user_mode(regs));
 475 #endif
 476                 do_timer(regs);
 477
 478                 /* Guarantee that the following sequences execute
 479                  * uninterrupted.
 480                  */
 481                 __asm__ __volatile__("rdpr      %%pstate, %0\n\t"
 482                                      "wrpr      %0, %1, %%pstate"
 483                                      : "=r" (pstate)
 484                                      : "i" (PSTATE_IE));
 485
 486                 timer_tick_compare = tick_ops->add_compare(timer_tick_offset);
 487                 ticks = tick_ops->get_tick();
 488
 489                 /* Restore PSTATE_IE. */
 490                 __asm__ __volatile__("wrpr      %0, 0x0, %%pstate"
 491                                      : /* no outputs */
 492                                      : "r" (pstate));
 493         } while (time_after_eq(ticks, timer_tick_compare));
 494
 495         timer_check_rtc();
 496
 497         write_sequnlock(&xtime_lock);
 498
 499         return IRQ_HANDLED;
 500 }
 501
 502 #ifdef CONFIG_SMP
 503 void timer_tick_interrupt(struct pt_regs *regs)
 504 {
 505         write_seqlock(&xtime_lock);
 506
 507         do_timer(regs);
 508
 509         /*
 510          * Only keep timer_tick_offset uptodate, but don't set TICK_CMPR.
 511          */
 512         timer_tick_compare = tick_ops->get_compare() + timer_tick_offset;
 513
 514         timer_check_rtc();
 515
 516         write_sequnlock(&xtime_lock);
 517 }
 518 #endif
 519
 520 /* Kick start a stopped clock (procedure from the Sun NVRAM/hostid FAQ). */
 521 static void __init kick_start_clock(void)
 522 {
 523         void * __iomem regs = mstk48t02_regs;
 524         u8 sec, tmp;
 525         int i, count;
 526
 527         prom_printf("CLOCK: Clock was stopped. Kick start ");
 528
 529         spin_lock_irq(&mostek_lock);
 530
 531         /* Turn on the kick start bit to start the oscillator. */
 532         tmp = mostek_read(regs + MOSTEK_CREG);
 533         tmp |= MSTK_CREG_WRITE;
 534         mostek_write(regs + MOSTEK_CREG, tmp);
 535         tmp = mostek_read(regs + MOSTEK_SEC);
 536         tmp &= ~MSTK_STOP;
 537         mostek_write(regs + MOSTEK_SEC, tmp);
 538         tmp = mostek_read(regs + MOSTEK_HOUR);
 539         tmp |= MSTK_KICK_START;
 540         mostek_write(regs + MOSTEK_HOUR, tmp);
 541         tmp = mostek_read(regs + MOSTEK_CREG);
 542         tmp &= ~MSTK_CREG_WRITE;
 543         mostek_write(regs + MOSTEK_CREG, tmp);
 544
 545         spin_unlock_irq(&mostek_lock);
 546
 547         /* Delay to allow the clock oscillator to start. */
 548         sec = MSTK_REG_SEC(regs);
 549         for (i = 0; i < 3; i++) {
 550                 while (sec == MSTK_REG_SEC(regs))
 551                         for (count = 0; count < 100000; count++)
 552                                 /* nothing */ ;
 553                 prom_printf(".");
 554                 sec = MSTK_REG_SEC(regs);
 555         }
 556         prom_printf("\n");
 557
 558         spin_lock_irq(&mostek_lock);
 559
 560         /* Turn off kick start and set a "valid" time and date. */
 561         tmp = mostek_read(regs + MOSTEK_CREG);
 562         tmp |= MSTK_CREG_WRITE;
 563         mostek_write(regs + MOSTEK_CREG, tmp);
 564         tmp = mostek_read(regs + MOSTEK_HOUR);
 565         tmp &= ~MSTK_KICK_START;
 566         mostek_write(regs + MOSTEK_HOUR, tmp);
 567         MSTK_SET_REG_SEC(regs,0);
 568         MSTK_SET_REG_MIN(regs,0);
 569         MSTK_SET_REG_HOUR(regs,0);
 570         MSTK_SET_REG_DOW(regs,5);
 571         MSTK_SET_REG_DOM(regs,1);
 572         MSTK_SET_REG_MONTH(regs,8);
 573         MSTK_SET_REG_YEAR(regs,1996 - MSTK_YEAR_ZERO);
 574         tmp = mostek_read(regs + MOSTEK_CREG);
 575         tmp &= ~MSTK_CREG_WRITE;
 576         mostek_write(regs + MOSTEK_CREG, tmp);
 577
 578         spin_unlock_irq(&mostek_lock);
 579
 580         /* Ensure the kick start bit is off. If it isn't, turn it off. */
 581         while (mostek_read(regs + MOSTEK_HOUR) & MSTK_KICK_START) {
 582                 prom_printf("CLOCK: Kick start still on!\n");
 583
 584                 spin_lock_irq(&mostek_lock);
 585
 586                 tmp = mostek_read(regs + MOSTEK_CREG);
 587                 tmp |= MSTK_CREG_WRITE;
 588                 mostek_write(regs + MOSTEK_CREG, tmp);
 589
 590                 tmp = mostek_read(regs + MOSTEK_HOUR);
 591                 tmp &= ~MSTK_KICK_START;
 592                 mostek_write(regs + MOSTEK_HOUR, tmp);
 593
 594                 tmp = mostek_read(regs + MOSTEK_CREG);
 595                 tmp &= ~MSTK_CREG_WRITE;
 596                 mostek_write(regs + MOSTEK_CREG, tmp);
 597
 598                 spin_unlock_irq(&mostek_lock);
 599         }
 600
 601         prom_printf("CLOCK: Kick start procedure successful.\n");
 602 }
 603
 604 /* Return nonzero if the clock chip battery is low. */
 605 static int __init has_low_battery(void)
 606 {
 607         void * __iomem regs = mstk48t02_regs;
 608         u8 data1, data2;
 609
 610         spin_lock_irq(&mostek_lock);
 611
 612         data1 = mostek_read(regs + MOSTEK_EEPROM);      /* Read some data. */
 613         mostek_write(regs + MOSTEK_EEPROM, ~data1);     /* Write back the complement. */
 614         data2 = mostek_read(regs + MOSTEK_EEPROM);      /* Read back the complement. */
 615         mostek_write(regs + MOSTEK_EEPROM, data1);      /* Restore original value. */
 616
 617         spin_unlock_irq(&mostek_lock);
 618
 619         return (data1 == data2);        /* Was the write blocked? */
 620 }
 621
 622 /* Probe for the real time clock chip. */
 623 static void __init set_system_time(void)
 624 {
 625         unsigned int year, mon, day, hour, min, sec;
 626         void * __iomem mregs = mstk48t02_regs;
 627 #ifdef CONFIG_PCI
 628         unsigned long dregs = ds1287_regs;
 629 #else
 630         unsigned long dregs = 0UL;
 631 #endif
 632         u8 tmp;
 633
 634         if (!mregs && !dregs) {
 635                 prom_printf("Something wrong, clock regs not mapped yet.\n");
 636                 prom_halt();
 637         }
 638
 639         if (mregs) {
 640                 spin_lock_irq(&mostek_lock);
 641
 642                 /* Traditional Mostek chip. */
 643                 tmp = mostek_read(mregs + MOSTEK_CREG);
 644                 tmp |= MSTK_CREG_READ;
 645                 mostek_write(mregs + MOSTEK_CREG, tmp);
 646
 647                 sec = MSTK_REG_SEC(mregs);
 648                 min = MSTK_REG_MIN(mregs);
 649                 hour = MSTK_REG_HOUR(mregs);
 650                 day = MSTK_REG_DOM(mregs);
 651                 mon = MSTK_REG_MONTH(mregs);
 652                 year = MSTK_CVT_YEAR( MSTK_REG_YEAR(mregs) );
 653         } else {
 654                 int i;
 655
 656                 /* Dallas 12887 RTC chip. */
 657
 658                 /* Stolen from arch/i386/kernel/time.c, see there for
 659                  * credits and descriptive comments.
 660                  */
 661                 for (i = 0; i < 1000000; i++) {
 662                         if (CMOS_READ(RTC_FREQ_SELECT) & RTC_UIP)
 663                                 break;
 664                         udelay(10);
 665                 }
 666                 for (i = 0; i < 1000000; i++) {
 667                         if (!(CMOS_READ(RTC_FREQ_SELECT) & RTC_UIP))
 668                                 break;
 669                         udelay(10);
 670                 }
 671                 do {
 672                         sec  = CMOS_READ(RTC_SECONDS);
 673                         min  = CMOS_READ(RTC_MINUTES);
 674                         hour = CMOS_READ(RTC_HOURS);
 675                         day  = CMOS_READ(RTC_DAY_OF_MONTH);
 676                         mon  = CMOS_READ(RTC_MONTH);
 677                         year = CMOS_READ(RTC_YEAR);
 678                 } while (sec != CMOS_READ(RTC_SECONDS));
 679                 if (!(CMOS_READ(RTC_CONTROL) & RTC_DM_BINARY) || RTC_ALWAYS_BCD) {
 680                         BCD_TO_BIN(sec);
 681                         BCD_TO_BIN(min);
 682                         BCD_TO_BIN(hour);
 683                         BCD_TO_BIN(day);
 684                         BCD_TO_BIN(mon);
 685                         BCD_TO_BIN(year);
 686                 }
 687                 if ((year += 1900) < 1970)
 688                         year += 100;
 689         }
 690
 691         xtime.tv_sec = mktime(year, mon, day, hour, min, sec);
 692         xtime.tv_nsec = (INITIAL_JIFFIES % HZ) * (NSEC_PER_SEC / HZ);
 693         set_normalized_timespec(&wall_to_monotonic,
 694                                 -xtime.tv_sec, -xtime.tv_nsec);
 695
 696         if (mregs) {
 697                 tmp = mostek_read(mregs + MOSTEK_CREG);
 698                 tmp &= ~MSTK_CREG_READ;
 699                 mostek_write(mregs + MOSTEK_CREG, tmp);
 700
 701                 spin_unlock_irq(&mostek_lock);
 702         }
 703 }
 704
 705 void __init clock_probe(void)
 706 {
 707         struct linux_prom_registers clk_reg[2];
 708         char model[128];
 709         int node, busnd = -1, err;
 710         unsigned long flags;
 711         struct linux_central *cbus;
 712 #ifdef CONFIG_PCI
 713         struct linux_ebus *ebus = NULL;
 714         struct sparc_isa_bridge *isa_br = NULL;
 715 #endif
 716         static int invoked;
 717
 718         if (invoked)
 719                 return;
 720         invoked = 1;
 721
 722
 723         if (this_is_starfire) {
 724                 /* davem suggests we keep this within the 4M locked kernel image */
 725                 static char obp_gettod[256];
 726                 static u32 unix_tod;
 727
 728                 sprintf(obp_gettod, "h# %08x unix-gettod",
 729                         (unsigned int) (long) &unix_tod);
 730                 prom_feval(obp_gettod);
 731                 xtime.tv_sec = unix_tod;
 732                 xtime.tv_nsec = (INITIAL_JIFFIES % HZ) * (NSEC_PER_SEC / HZ);
 733                 set_normalized_timespec(&wall_to_monotonic,
 734                                         -xtime.tv_sec, -xtime.tv_nsec);
 735                 return;
 736         }
 737
 738         local_irq_save(flags);
 739
 740         cbus = central_bus;
 741         if (cbus != NULL)
 742                 busnd = central_bus->child->prom_node;
 743
 744         /* Check FHC Central then EBUSs then ISA bridges then SBUSs.
 745          * That way we handle the presence of multiple properly.
 746          *
 747          * As a special case, machines with Central must provide the
 748          * timer chip there.
 749          */
 750 #ifdef CONFIG_PCI
 751         if (ebus_chain != NULL) {
 752                 ebus = ebus_chain;
 753                 if (busnd == -1)
 754                         busnd = ebus->prom_node;
 755         }
 756         if (isa_chain != NULL) {
 757                 isa_br = isa_chain;
 758                 if (busnd == -1)
 759                         busnd = isa_br->prom_node;
 760         }
 761 #endif
 762         if (sbus_root != NULL && busnd == -1)
 763                 busnd = sbus_root->prom_node;
 764
 765         if (busnd == -1) {
 766                 prom_printf("clock_probe: problem, cannot find bus to search.\n");
 767                 prom_halt();
 768         }
 769
 770         node = prom_getchild(busnd);
 771
 772         while (1) {
 773                 if (!node)
 774                         model[0] = 0;
 775                 else
 776                         prom_getstring(node, "model", model, sizeof(model));
 777                 if (strcmp(model, "mk48t02") &&
 778                     strcmp(model, "mk48t08") &&
 779                     strcmp(model, "mk48t59") &&
 780                     strcmp(model, "m5819") &&
 781                     strcmp(model, "m5819p") &&
 782                     strcmp(model, "m5823") &&
 783                     strcmp(model, "ds1287")) {
 784                         if (cbus != NULL) {
 785                                 prom_printf("clock_probe: Central bus lacks timer chip.\n");
 786                                 prom_halt();
 787                         }
 788
 789                         if (node != 0)
 790                                 node = prom_getsibling(node);
 791 #ifdef CONFIG_PCI
 792                         while ((node == 0) && ebus != NULL) {
 793                                 ebus = ebus->next;
 794                                 if (ebus != NULL) {
 795                                         busnd = ebus->prom_node;
 796                                         node = prom_getchild(busnd);
 797                                 }
 798                         }
 799                         while ((node == 0) && isa_br != NULL) {
 800                                 isa_br = isa_br->next;
 801                                 if (isa_br != NULL) {
 802                                         busnd = isa_br->prom_node;
 803                                         node = prom_getchild(busnd);
 804                                 }
 805                         }
 806 #endif
 807                         if (node == 0) {
 808                                 prom_printf("clock_probe: Cannot find timer chip\n");
 809                                 prom_halt();
 810                         }
 811                         continue;
 812                 }
 813
 814                 err = prom_getproperty(node, "reg", (char *)clk_reg,
 815                                        sizeof(clk_reg));
 816                 if(err == -1) {
 817                         prom_printf("clock_probe: Cannot get Mostek reg property\n");
 818                         prom_halt();
 819                 }
 820
 821                 if (cbus != NULL) {
 822                         apply_fhc_ranges(central_bus->child, clk_reg, 1);
 823                         apply_central_ranges(central_bus, clk_reg, 1);
 824                 }
 825 #ifdef CONFIG_PCI
 826                 else if (ebus != NULL) {
 827                         struct linux_ebus_device *edev;
 828
 829                         for_each_ebusdev(edev, ebus)
 830                                 if (edev->prom_node == node)
 831                                         break;
 832                         if (edev == NULL) {
 833                                 if (isa_chain != NULL)
 834                                         goto try_isa_clock;
 835                                 prom_printf("%s: Mostek not probed by EBUS\n",
 836                                             __FUNCTION__);
 837                                 prom_halt();
 838                         }
 839
 840                         if (!strcmp(model, "ds1287") ||
 841                             !strcmp(model, "m5819") ||
 842                             !strcmp(model, "m5819p") ||
 843                             !strcmp(model, "m5823")) {
 844                                 ds1287_regs = edev->resource[0].start;
 845                         } else {
 846                                 mstk48t59_regs = (void * __iomem)
 847                                         edev->resource[0].start;
 848                                 mstk48t02_regs = mstk48t59_regs + MOSTEK_48T59_48T02;
 849                         }
 850                         break;
 851                 }
 852                 else if (isa_br != NULL) {
 853                         struct sparc_isa_device *isadev;
 854
 855 try_isa_clock:
 856                         for_each_isadev(isadev, isa_br)
 857                                 if (isadev->prom_node == node)
 858                                         break;
 859                         if (isadev == NULL) {
 860                                 prom_printf("%s: Mostek not probed by ISA\n");
 861                                 prom_halt();
 862                         }
 863                         if (!strcmp(model, "ds1287") ||
 864                             !strcmp(model, "m5819") ||
 865                             !strcmp(model, "m5819p") ||
 866                             !strcmp(model, "m5823")) {
 867                                 ds1287_regs = isadev->resource.start;
 868                         } else {
 869                                 mstk48t59_regs = (void * __iomem)
 870                                         isadev->resource.start;
 871                                 mstk48t02_regs = mstk48t59_regs + MOSTEK_48T59_48T02;
 872                         }
 873                         break;
 874                 }
 875 #endif
 876                 else {
 877                         if (sbus_root->num_sbus_ranges) {
 878                                 int nranges = sbus_root->num_sbus_ranges;
 879                                 int rngc;
 880
 881                                 for (rngc = 0; rngc < nranges; rngc++)
 882                                         if (clk_reg[0].which_io ==
 883                                             sbus_root->sbus_ranges[rngc].ot_child_space)
 884                                                 break;
 885                                 if (rngc == nranges) {
 886                                         prom_printf("clock_probe: Cannot find ranges for "
 887                                                     "clock regs.\n");
 888                                         prom_halt();
 889                                 }
 890                                 clk_reg[0].which_io =
 891                                         sbus_root->sbus_ranges[rngc].ot_parent_space;
 892                                 clk_reg[0].phys_addr +=
 893                                         sbus_root->sbus_ranges[rngc].ot_parent_base;
 894                         }
 895                 }
 896
 897                 if(model[5] == '0' && model[6] == '2') {
 898                         mstk48t02_regs = (void * __iomem)
 899                                 (((u64)clk_reg[0].phys_addr) |
 900                                  (((u64)clk_reg[0].which_io)<<32UL));
 901                 } else if(model[5] == '0' && model[6] == '8') {
 902                         mstk48t08_regs = (void * __iomem)
 903                                 (((u64)clk_reg[0].phys_addr) |
 904                                  (((u64)clk_reg[0].which_io)<<32UL));
 905                         mstk48t02_regs = mstk48t08_regs + MOSTEK_48T08_48T02;
 906                 } else {
 907                         mstk48t59_regs = (void * __iomem)
 908                                 (((u64)clk_reg[0].phys_addr) |
 909                                  (((u64)clk_reg[0].which_io)<<32UL));
 910                         mstk48t02_regs = mstk48t59_regs + MOSTEK_48T59_48T02;
 911                 }
 912                 break;
 913         }
 914
 915         if (mstk48t02_regs != NULL) {
 916                 /* Report a low battery voltage condition. */
 917                 if (has_low_battery())
 918                         prom_printf("NVRAM: Low battery voltage!\n");
 919
 920                 /* Kick start the clock if it is completely stopped. */
 921                 if (mostek_read(mstk48t02_regs + MOSTEK_SEC) & MSTK_STOP)
 922                         kick_start_clock();
 923         }
 924
 925         set_system_time();
 926
 927         local_irq_restore(flags);
 928 }
 929
 930 /* This is gets the master TICK_INT timer going. */
 931 static unsigned long sparc64_init_timers(void)
 932 {
 933         unsigned long clock;
 934         int node;
 935 #ifdef CONFIG_SMP
 936         extern void smp_tick_init(void);
 937 #endif
 938
 939         if (tlb_type == spitfire) {
 940                 unsigned long ver, manuf, impl;
 941
 942                 __asm__ __volatile__ ("rdpr %%ver, %0"
 943                                       : "=&r" (ver));
 944                 manuf = ((ver >> 48) & 0xffff);
 945                 impl = ((ver >> 32) & 0xffff);
 946                 if (manuf == 0x17 && impl == 0x13) {
 947                         /* Hummingbird, aka Ultra-IIe */
 948                         tick_ops = &hbtick_operations;
 949                         node = prom_root_node;
 950                         clock = prom_getint(node, "stick-frequency");
 951                 } else {
 952                         tick_ops = &tick_operations;
 953                         cpu_find_by_instance(0, &node, NULL);
 954                         clock = prom_getint(node, "clock-frequency");
 955                 }
 956         } else {
 957                 tick_ops = &stick_operations;
 958                 node = prom_root_node;
 959                 clock = prom_getint(node, "stick-frequency");
 960         }
 961         timer_tick_offset = clock / HZ;
 962
 963 #ifdef CONFIG_SMP
 964         smp_tick_init();
 965 #endif
 966
 967         return clock;
 968 }
 969
 970 static void sparc64_start_timers(irqreturn_t (*cfunc)(int, void *, struct pt_regs *))
 971 {
 972         unsigned long pstate;
 973         int err;
 974
 975         /* Register IRQ handler. */
 976         err = request_irq(build_irq(0, 0, 0UL, 0UL), cfunc, SA_STATIC_ALLOC,
 977                           "timer", NULL);
 978
 979         if (err) {
 980                 prom_printf("Serious problem, cannot register TICK_INT\n");
 981                 prom_halt();
 982         }
 983
 984         /* Guarantee that the following sequences execute
 985          * uninterrupted.
 986          */
 987         __asm__ __volatile__("rdpr      %%pstate, %0\n\t"
 988                              "wrpr      %0, %1, %%pstate"
 989                              : "=r" (pstate)
 990                              : "i" (PSTATE_IE));
 991
 992         tick_ops->init_tick(timer_tick_offset);
 993
 994         /* Restore PSTATE_IE. */
 995         __asm__ __volatile__("wrpr      %0, 0x0, %%pstate"
 996                              : /* no outputs */
 997                              : "r" (pstate));
 998
 999         local_irq_enable();
1000 }
1001
1002 struct freq_table {
1003         unsigned long udelay_val_ref;
1004         unsigned long clock_tick_ref;
1005         unsigned int ref_freq;
1006 };
1007 static DEFINE_PER_CPU(struct freq_table, sparc64_freq_table) = { 0, 0, 0 };
1008
1009 unsigned long sparc64_get_clock_tick(unsigned int cpu)
1010 {
1011         struct freq_table *ft = &per_cpu(sparc64_freq_table, cpu);
1012
1013         if (ft->clock_tick_ref)
1014                 return ft->clock_tick_ref;
1015         return cpu_data(cpu).clock_tick;
1016 }
1017
1018 #ifdef CONFIG_CPU_FREQ
1019
1020 static int sparc64_cpufreq_notifier(struct notifier_block *nb, unsigned long val,
1021                                     void *data)
1022 {
1023         struct cpufreq_freqs *freq = data;
1024         unsigned int cpu = freq->cpu;
1025         struct freq_table *ft = &per_cpu(sparc64_freq_table, cpu);
1026
1027         if (!ft->ref_freq) {
1028                 ft->ref_freq = freq->old;
1029                 ft->udelay_val_ref = cpu_data(cpu).udelay_val;
1030                 ft->clock_tick_ref = cpu_data(cpu).clock_tick;
1031         }
1032         if ((val == CPUFREQ_PRECHANGE  && freq->old < freq->new) ||
1033             (val == CPUFREQ_POSTCHANGE && freq->old > freq->new) ||
1034             (val == CPUFREQ_RESUMECHANGE)) {
1035                 cpu_data(cpu).udelay_val =
1036                         cpufreq_scale(ft->udelay_val_ref,
1037                                       ft->ref_freq,
1038                                       freq->new);
1039                 cpu_data(cpu).clock_tick =
1040                         cpufreq_scale(ft->clock_tick_ref,
1041                                       ft->ref_freq,
1042                                       freq->new);
1043         }
1044
1045         return 0;
1046 }
1047
1048 static struct notifier_block sparc64_cpufreq_notifier_block = {
1049         .notifier_call  = sparc64_cpufreq_notifier
1050 };
1051
1052 #endif /* CONFIG_CPU_FREQ */
1053
1054 static struct time_interpolator sparc64_cpu_interpolator = {
1055         .source         =       TIME_SOURCE_CPU,
1056         .shift          =       16,
1057         .mask           =       0xffffffffffffffffLL
1058 };
1059
1060 /* The quotient formula is taken from the IA64 port. */
1061 #define SPARC64_NSEC_PER_CYC_SHIFT      30UL
1062 void __init time_init(void)
1063 {
1064         unsigned long clock = sparc64_init_timers();
1065
1066         sparc64_cpu_interpolator.frequency = clock;
1067         register_time_interpolator(&sparc64_cpu_interpolator);
1068
1069         /* Now that the interpolator is registered, it is
1070          * safe to start the timer ticking.
1071          */
1072         sparc64_start_timers(timer_interrupt);
1073
1074         timer_ticks_per_nsec_quotient =
1075                 (((NSEC_PER_SEC << SPARC64_NSEC_PER_CYC_SHIFT) +
1076                   (clock / 2)) / clock);
1077
1078 #ifdef CONFIG_CPU_FREQ
1079         cpufreq_register_notifier(&sparc64_cpufreq_notifier_block,
1080                                   CPUFREQ_TRANSITION_NOTIFIER);
1081 #endif
1082 }
1083
1084 unsigned long long sched_clock(void)
1085 {
1086         unsigned long ticks = tick_ops->get_tick();
1087
1088         return (ticks * timer_ticks_per_nsec_quotient)
1089                 >> SPARC64_NSEC_PER_CYC_SHIFT;
1090 }
1091
1092 static int set_rtc_mmss(unsigned long nowtime)
1093 {
1094         int real_seconds, real_minutes, chip_minutes;
1095         void * __iomem mregs = mstk48t02_regs;
1096 #ifdef CONFIG_PCI
1097         unsigned long dregs = ds1287_regs;
1098 #else
1099         unsigned long dregs = 0UL;
1100 #endif
1101         unsigned long flags;
1102         u8 tmp;
1103
1104         /*
1105          * Not having a register set can lead to trouble.
1106          * Also starfire doesn't have a tod clock.
1107          */
1108         if (!mregs && !dregs)
1109                 return -1;
1110
1111         if (mregs) {
1112                 spin_lock_irqsave(&mostek_lock, flags);
1113
1114                 /* Read the current RTC minutes. */
1115                 tmp = mostek_read(mregs + MOSTEK_CREG);
1116                 tmp |= MSTK_CREG_READ;
1117                 mostek_write(mregs + MOSTEK_CREG, tmp);
1118
1119                 chip_minutes = MSTK_REG_MIN(mregs);
1120
1121                 tmp = mostek_read(mregs + MOSTEK_CREG);
1122                 tmp &= ~MSTK_CREG_READ;
1123                 mostek_write(mregs + MOSTEK_CREG, tmp);
1124
1125                 /*
1126                  * since we're only adjusting minutes and seconds,
1127                  * don't interfere with hour overflow. This avoids
1128                  * messing with unknown time zones but requires your
1129                  * RTC not to be off by more than 15 minutes
1130                  */
1131                 real_seconds = nowtime % 60;
1132                 real_minutes = nowtime / 60;
1133                 if (((abs(real_minutes - chip_minutes) + 15)/30) & 1)
1134                         real_minutes += 30;     /* correct for half hour time zone */
1135                 real_minutes %= 60;
1136
1137                 if (abs(real_minutes - chip_minutes) < 30) {
1138                         tmp = mostek_read(mregs + MOSTEK_CREG);
1139                         tmp |= MSTK_CREG_WRITE;
1140                         mostek_write(mregs + MOSTEK_CREG, tmp);
1141
1142                         MSTK_SET_REG_SEC(mregs,real_seconds);
1143                         MSTK_SET_REG_MIN(mregs,real_minutes);
1144
1145                         tmp = mostek_read(mregs + MOSTEK_CREG);
1146                         tmp &= ~MSTK_CREG_WRITE;
1147                         mostek_write(mregs + MOSTEK_CREG, tmp);
1148
1149                         spin_unlock_irqrestore(&mostek_lock, flags);
1150
1151                         return 0;
1152                 } else {
1153                         spin_unlock_irqrestore(&mostek_lock, flags);
1154
1155                         return -1;
1156                 }
1157         } else {
1158                 int retval = 0;
1159                 unsigned char save_control, save_freq_select;
1160
1161                 /* Stolen from arch/i386/kernel/time.c, see there for
1162                  * credits and descriptive comments.
1163                  */
1164                 spin_lock_irqsave(&rtc_lock, flags);
1165                 save_control = CMOS_READ(RTC_CONTROL); /* tell the clock it's being set */
1166                 CMOS_WRITE((save_control|RTC_SET), RTC_CONTROL);
1167
1168                 save_freq_select = CMOS_READ(RTC_FREQ_SELECT); /* stop and reset prescaler */
1169                 CMOS_WRITE((save_freq_select|RTC_DIV_RESET2), RTC_FREQ_SELECT);
1170
1171                 chip_minutes = CMOS_READ(RTC_MINUTES);
1172                 if (!(save_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD)
1173                         BCD_TO_BIN(chip_minutes);
1174                 real_seconds = nowtime % 60;
1175                 real_minutes = nowtime / 60;
1176                 if (((abs(real_minutes - chip_minutes) + 15)/30) & 1)
1177                         real_minutes += 30;
1178                 real_minutes %= 60;
1179
1180                 if (abs(real_minutes - chip_minutes) < 30) {
1181                         if (!(save_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD) {
1182                                 BIN_TO_BCD(real_seconds);
1183                                 BIN_TO_BCD(real_minutes);
1184                         }
1185                         CMOS_WRITE(real_seconds,RTC_SECONDS);
1186                         CMOS_WRITE(real_minutes,RTC_MINUTES);
1187                 } else {
1188                         printk(KERN_WARNING
1189                                "set_rtc_mmss: can't update from %d to %d\n",
1190                                chip_minutes, real_minutes);
1191                         retval = -1;
1192                 }
1193
1194                 CMOS_WRITE(save_control, RTC_CONTROL);
1195                 CMOS_WRITE(save_freq_select, RTC_FREQ_SELECT);
1196                 spin_unlock_irqrestore(&rtc_lock, flags);
1197
1198                 return retval;
1199         }
1200 }