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