Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/roland...
[linux-2.6] / arch / sparc64 / kernel / time.c
1 /* time.c: UltraSparc timer and TOD clock support.
2  *
3  * Copyright (C) 1997, 2008 David S. Miller (davem@davemloft.net)
4  * Copyright (C) 1998 Eddie C. Dost   (ecd@skynet.be)
5  *
6  * Based largely on code which is:
7  *
8  * Copyright (C) 1996 Thomas K. Dyas (tdyas@eden.rutgers.edu)
9  */
10
11 #include <linux/errno.h>
12 #include <linux/module.h>
13 #include <linux/sched.h>
14 #include <linux/kernel.h>
15 #include <linux/param.h>
16 #include <linux/string.h>
17 #include <linux/mm.h>
18 #include <linux/interrupt.h>
19 #include <linux/time.h>
20 #include <linux/timex.h>
21 #include <linux/init.h>
22 #include <linux/ioport.h>
23 #include <linux/mc146818rtc.h>
24 #include <linux/delay.h>
25 #include <linux/profile.h>
26 #include <linux/bcd.h>
27 #include <linux/jiffies.h>
28 #include <linux/cpufreq.h>
29 #include <linux/percpu.h>
30 #include <linux/miscdevice.h>
31 #include <linux/rtc.h>
32 #include <linux/kernel_stat.h>
33 #include <linux/clockchips.h>
34 #include <linux/clocksource.h>
35
36 #include <asm/oplib.h>
37 #include <asm/mostek.h>
38 #include <asm/timer.h>
39 #include <asm/irq.h>
40 #include <asm/io.h>
41 #include <asm/prom.h>
42 #include <asm/of_device.h>
43 #include <asm/starfire.h>
44 #include <asm/smp.h>
45 #include <asm/sections.h>
46 #include <asm/cpudata.h>
47 #include <asm/uaccess.h>
48 #include <asm/irq_regs.h>
49
50 #include "entry.h"
51
52 DEFINE_SPINLOCK(mostek_lock);
53 DEFINE_SPINLOCK(rtc_lock);
54 void __iomem *mstk48t02_regs = NULL;
55 #ifdef CONFIG_PCI
56 unsigned long ds1287_regs = 0UL;
57 static void __iomem *bq4802_regs;
58 #endif
59
60 static void __iomem *mstk48t08_regs;
61 static void __iomem *mstk48t59_regs;
62
63 static int set_rtc_mmss(unsigned long);
64
65 #define TICK_PRIV_BIT   (1UL << 63)
66 #define TICKCMP_IRQ_BIT (1UL << 63)
67
68 #ifdef CONFIG_SMP
69 unsigned long profile_pc(struct pt_regs *regs)
70 {
71         unsigned long pc = instruction_pointer(regs);
72
73         if (in_lock_functions(pc))
74                 return regs->u_regs[UREG_RETPC];
75         return pc;
76 }
77 EXPORT_SYMBOL(profile_pc);
78 #endif
79
80 static void tick_disable_protection(void)
81 {
82         /* Set things up so user can access tick register for profiling
83          * purposes.  Also workaround BB_ERRATA_1 by doing a dummy
84          * read back of %tick after writing it.
85          */
86         __asm__ __volatile__(
87         "       ba,pt   %%xcc, 1f\n"
88         "        nop\n"
89         "       .align  64\n"
90         "1:     rd      %%tick, %%g2\n"
91         "       add     %%g2, 6, %%g2\n"
92         "       andn    %%g2, %0, %%g2\n"
93         "       wrpr    %%g2, 0, %%tick\n"
94         "       rdpr    %%tick, %%g0"
95         : /* no outputs */
96         : "r" (TICK_PRIV_BIT)
97         : "g2");
98 }
99
100 static void tick_disable_irq(void)
101 {
102         __asm__ __volatile__(
103         "       ba,pt   %%xcc, 1f\n"
104         "        nop\n"
105         "       .align  64\n"
106         "1:     wr      %0, 0x0, %%tick_cmpr\n"
107         "       rd      %%tick_cmpr, %%g0"
108         : /* no outputs */
109         : "r" (TICKCMP_IRQ_BIT));
110 }
111
112 static void tick_init_tick(void)
113 {
114         tick_disable_protection();
115         tick_disable_irq();
116 }
117
118 static unsigned long tick_get_tick(void)
119 {
120         unsigned long ret;
121
122         __asm__ __volatile__("rd        %%tick, %0\n\t"
123                              "mov       %0, %0"
124                              : "=r" (ret));
125
126         return ret & ~TICK_PRIV_BIT;
127 }
128
129 static int tick_add_compare(unsigned long adj)
130 {
131         unsigned long orig_tick, new_tick, new_compare;
132
133         __asm__ __volatile__("rd        %%tick, %0"
134                              : "=r" (orig_tick));
135
136         orig_tick &= ~TICKCMP_IRQ_BIT;
137
138         /* Workaround for Spitfire Errata (#54 I think??), I discovered
139          * this via Sun BugID 4008234, mentioned in Solaris-2.5.1 patch
140          * number 103640.
141          *
142          * On Blackbird writes to %tick_cmpr can fail, the
143          * workaround seems to be to execute the wr instruction
144          * at the start of an I-cache line, and perform a dummy
145          * read back from %tick_cmpr right after writing to it. -DaveM
146          */
147         __asm__ __volatile__("ba,pt     %%xcc, 1f\n\t"
148                              " add      %1, %2, %0\n\t"
149                              ".align    64\n"
150                              "1:\n\t"
151                              "wr        %0, 0, %%tick_cmpr\n\t"
152                              "rd        %%tick_cmpr, %%g0\n\t"
153                              : "=r" (new_compare)
154                              : "r" (orig_tick), "r" (adj));
155
156         __asm__ __volatile__("rd        %%tick, %0"
157                              : "=r" (new_tick));
158         new_tick &= ~TICKCMP_IRQ_BIT;
159
160         return ((long)(new_tick - (orig_tick+adj))) > 0L;
161 }
162
163 static unsigned long tick_add_tick(unsigned long adj)
164 {
165         unsigned long new_tick;
166
167         /* Also need to handle Blackbird bug here too. */
168         __asm__ __volatile__("rd        %%tick, %0\n\t"
169                              "add       %0, %1, %0\n\t"
170                              "wrpr      %0, 0, %%tick\n\t"
171                              : "=&r" (new_tick)
172                              : "r" (adj));
173
174         return new_tick;
175 }
176
177 static struct sparc64_tick_ops tick_operations __read_mostly = {
178         .name           =       "tick",
179         .init_tick      =       tick_init_tick,
180         .disable_irq    =       tick_disable_irq,
181         .get_tick       =       tick_get_tick,
182         .add_tick       =       tick_add_tick,
183         .add_compare    =       tick_add_compare,
184         .softint_mask   =       1UL << 0,
185 };
186
187 struct sparc64_tick_ops *tick_ops __read_mostly = &tick_operations;
188
189 static void stick_disable_irq(void)
190 {
191         __asm__ __volatile__(
192         "wr     %0, 0x0, %%asr25"
193         : /* no outputs */
194         : "r" (TICKCMP_IRQ_BIT));
195 }
196
197 static void stick_init_tick(void)
198 {
199         /* Writes to the %tick and %stick register are not
200          * allowed on sun4v.  The Hypervisor controls that
201          * bit, per-strand.
202          */
203         if (tlb_type != hypervisor) {
204                 tick_disable_protection();
205                 tick_disable_irq();
206
207                 /* Let the user get at STICK too. */
208                 __asm__ __volatile__(
209                 "       rd      %%asr24, %%g2\n"
210                 "       andn    %%g2, %0, %%g2\n"
211                 "       wr      %%g2, 0, %%asr24"
212                 : /* no outputs */
213                 : "r" (TICK_PRIV_BIT)
214                 : "g1", "g2");
215         }
216
217         stick_disable_irq();
218 }
219
220 static unsigned long stick_get_tick(void)
221 {
222         unsigned long ret;
223
224         __asm__ __volatile__("rd        %%asr24, %0"
225                              : "=r" (ret));
226
227         return ret & ~TICK_PRIV_BIT;
228 }
229
230 static unsigned long stick_add_tick(unsigned long adj)
231 {
232         unsigned long new_tick;
233
234         __asm__ __volatile__("rd        %%asr24, %0\n\t"
235                              "add       %0, %1, %0\n\t"
236                              "wr        %0, 0, %%asr24\n\t"
237                              : "=&r" (new_tick)
238                              : "r" (adj));
239
240         return new_tick;
241 }
242
243 static int stick_add_compare(unsigned long adj)
244 {
245         unsigned long orig_tick, new_tick;
246
247         __asm__ __volatile__("rd        %%asr24, %0"
248                              : "=r" (orig_tick));
249         orig_tick &= ~TICKCMP_IRQ_BIT;
250
251         __asm__ __volatile__("wr        %0, 0, %%asr25"
252                              : /* no outputs */
253                              : "r" (orig_tick + adj));
254
255         __asm__ __volatile__("rd        %%asr24, %0"
256                              : "=r" (new_tick));
257         new_tick &= ~TICKCMP_IRQ_BIT;
258
259         return ((long)(new_tick - (orig_tick+adj))) > 0L;
260 }
261
262 static struct sparc64_tick_ops stick_operations __read_mostly = {
263         .name           =       "stick",
264         .init_tick      =       stick_init_tick,
265         .disable_irq    =       stick_disable_irq,
266         .get_tick       =       stick_get_tick,
267         .add_tick       =       stick_add_tick,
268         .add_compare    =       stick_add_compare,
269         .softint_mask   =       1UL << 16,
270 };
271
272 /* On Hummingbird the STICK/STICK_CMPR register is implemented
273  * in I/O space.  There are two 64-bit registers each, the
274  * first holds the low 32-bits of the value and the second holds
275  * the high 32-bits.
276  *
277  * Since STICK is constantly updating, we have to access it carefully.
278  *
279  * The sequence we use to read is:
280  * 1) read high
281  * 2) read low
282  * 3) read high again, if it rolled re-read both low and high again.
283  *
284  * Writing STICK safely is also tricky:
285  * 1) write low to zero
286  * 2) write high
287  * 3) write low
288  */
289 #define HBIRD_STICKCMP_ADDR     0x1fe0000f060UL
290 #define HBIRD_STICK_ADDR        0x1fe0000f070UL
291
292 static unsigned long __hbird_read_stick(void)
293 {
294         unsigned long ret, tmp1, tmp2, tmp3;
295         unsigned long addr = HBIRD_STICK_ADDR+8;
296
297         __asm__ __volatile__("ldxa      [%1] %5, %2\n"
298                              "1:\n\t"
299                              "sub       %1, 0x8, %1\n\t"
300                              "ldxa      [%1] %5, %3\n\t"
301                              "add       %1, 0x8, %1\n\t"
302                              "ldxa      [%1] %5, %4\n\t"
303                              "cmp       %4, %2\n\t"
304                              "bne,a,pn  %%xcc, 1b\n\t"
305                              " mov      %4, %2\n\t"
306                              "sllx      %4, 32, %4\n\t"
307                              "or        %3, %4, %0\n\t"
308                              : "=&r" (ret), "=&r" (addr),
309                                "=&r" (tmp1), "=&r" (tmp2), "=&r" (tmp3)
310                              : "i" (ASI_PHYS_BYPASS_EC_E), "1" (addr));
311
312         return ret;
313 }
314
315 static void __hbird_write_stick(unsigned long val)
316 {
317         unsigned long low = (val & 0xffffffffUL);
318         unsigned long high = (val >> 32UL);
319         unsigned long addr = HBIRD_STICK_ADDR;
320
321         __asm__ __volatile__("stxa      %%g0, [%0] %4\n\t"
322                              "add       %0, 0x8, %0\n\t"
323                              "stxa      %3, [%0] %4\n\t"
324                              "sub       %0, 0x8, %0\n\t"
325                              "stxa      %2, [%0] %4"
326                              : "=&r" (addr)
327                              : "0" (addr), "r" (low), "r" (high),
328                                "i" (ASI_PHYS_BYPASS_EC_E));
329 }
330
331 static void __hbird_write_compare(unsigned long val)
332 {
333         unsigned long low = (val & 0xffffffffUL);
334         unsigned long high = (val >> 32UL);
335         unsigned long addr = HBIRD_STICKCMP_ADDR + 0x8UL;
336
337         __asm__ __volatile__("stxa      %3, [%0] %4\n\t"
338                              "sub       %0, 0x8, %0\n\t"
339                              "stxa      %2, [%0] %4"
340                              : "=&r" (addr)
341                              : "0" (addr), "r" (low), "r" (high),
342                                "i" (ASI_PHYS_BYPASS_EC_E));
343 }
344
345 static void hbtick_disable_irq(void)
346 {
347         __hbird_write_compare(TICKCMP_IRQ_BIT);
348 }
349
350 static void hbtick_init_tick(void)
351 {
352         tick_disable_protection();
353
354         /* XXX This seems to be necessary to 'jumpstart' Hummingbird
355          * XXX into actually sending STICK interrupts.  I think because
356          * XXX of how we store %tick_cmpr in head.S this somehow resets the
357          * XXX {TICK + STICK} interrupt mux.  -DaveM
358          */
359         __hbird_write_stick(__hbird_read_stick());
360
361         hbtick_disable_irq();
362 }
363
364 static unsigned long hbtick_get_tick(void)
365 {
366         return __hbird_read_stick() & ~TICK_PRIV_BIT;
367 }
368
369 static unsigned long hbtick_add_tick(unsigned long adj)
370 {
371         unsigned long val;
372
373         val = __hbird_read_stick() + adj;
374         __hbird_write_stick(val);
375
376         return val;
377 }
378
379 static int hbtick_add_compare(unsigned long adj)
380 {
381         unsigned long val = __hbird_read_stick();
382         unsigned long val2;
383
384         val &= ~TICKCMP_IRQ_BIT;
385         val += adj;
386         __hbird_write_compare(val);
387
388         val2 = __hbird_read_stick() & ~TICKCMP_IRQ_BIT;
389
390         return ((long)(val2 - val)) > 0L;
391 }
392
393 static struct sparc64_tick_ops hbtick_operations __read_mostly = {
394         .name           =       "hbtick",
395         .init_tick      =       hbtick_init_tick,
396         .disable_irq    =       hbtick_disable_irq,
397         .get_tick       =       hbtick_get_tick,
398         .add_tick       =       hbtick_add_tick,
399         .add_compare    =       hbtick_add_compare,
400         .softint_mask   =       1UL << 0,
401 };
402
403 static unsigned long timer_ticks_per_nsec_quotient __read_mostly;
404
405 int update_persistent_clock(struct timespec now)
406 {
407         return set_rtc_mmss(now.tv_sec);
408 }
409
410 /* Kick start a stopped clock (procedure from the Sun NVRAM/hostid FAQ). */
411 static void __init kick_start_clock(void)
412 {
413         void __iomem *regs = mstk48t02_regs;
414         u8 sec, tmp;
415         int i, count;
416
417         prom_printf("CLOCK: Clock was stopped. Kick start ");
418
419         spin_lock_irq(&mostek_lock);
420
421         /* Turn on the kick start bit to start the oscillator. */
422         tmp = mostek_read(regs + MOSTEK_CREG);
423         tmp |= MSTK_CREG_WRITE;
424         mostek_write(regs + MOSTEK_CREG, tmp);
425         tmp = mostek_read(regs + MOSTEK_SEC);
426         tmp &= ~MSTK_STOP;
427         mostek_write(regs + MOSTEK_SEC, tmp);
428         tmp = mostek_read(regs + MOSTEK_HOUR);
429         tmp |= MSTK_KICK_START;
430         mostek_write(regs + MOSTEK_HOUR, tmp);
431         tmp = mostek_read(regs + MOSTEK_CREG);
432         tmp &= ~MSTK_CREG_WRITE;
433         mostek_write(regs + MOSTEK_CREG, tmp);
434
435         spin_unlock_irq(&mostek_lock);
436
437         /* Delay to allow the clock oscillator to start. */
438         sec = MSTK_REG_SEC(regs);
439         for (i = 0; i < 3; i++) {
440                 while (sec == MSTK_REG_SEC(regs))
441                         for (count = 0; count < 100000; count++)
442                                 /* nothing */ ;
443                 prom_printf(".");
444                 sec = MSTK_REG_SEC(regs);
445         }
446         prom_printf("\n");
447
448         spin_lock_irq(&mostek_lock);
449
450         /* Turn off kick start and set a "valid" time and date. */
451         tmp = mostek_read(regs + MOSTEK_CREG);
452         tmp |= MSTK_CREG_WRITE;
453         mostek_write(regs + MOSTEK_CREG, tmp);
454         tmp = mostek_read(regs + MOSTEK_HOUR);
455         tmp &= ~MSTK_KICK_START;
456         mostek_write(regs + MOSTEK_HOUR, tmp);
457         MSTK_SET_REG_SEC(regs,0);
458         MSTK_SET_REG_MIN(regs,0);
459         MSTK_SET_REG_HOUR(regs,0);
460         MSTK_SET_REG_DOW(regs,5);
461         MSTK_SET_REG_DOM(regs,1);
462         MSTK_SET_REG_MONTH(regs,8);
463         MSTK_SET_REG_YEAR(regs,1996 - MSTK_YEAR_ZERO);
464         tmp = mostek_read(regs + MOSTEK_CREG);
465         tmp &= ~MSTK_CREG_WRITE;
466         mostek_write(regs + MOSTEK_CREG, tmp);
467
468         spin_unlock_irq(&mostek_lock);
469
470         /* Ensure the kick start bit is off. If it isn't, turn it off. */
471         while (mostek_read(regs + MOSTEK_HOUR) & MSTK_KICK_START) {
472                 prom_printf("CLOCK: Kick start still on!\n");
473
474                 spin_lock_irq(&mostek_lock);
475
476                 tmp = mostek_read(regs + MOSTEK_CREG);
477                 tmp |= MSTK_CREG_WRITE;
478                 mostek_write(regs + MOSTEK_CREG, tmp);
479
480                 tmp = mostek_read(regs + MOSTEK_HOUR);
481                 tmp &= ~MSTK_KICK_START;
482                 mostek_write(regs + MOSTEK_HOUR, tmp);
483
484                 tmp = mostek_read(regs + MOSTEK_CREG);
485                 tmp &= ~MSTK_CREG_WRITE;
486                 mostek_write(regs + MOSTEK_CREG, tmp);
487
488                 spin_unlock_irq(&mostek_lock);
489         }
490
491         prom_printf("CLOCK: Kick start procedure successful.\n");
492 }
493
494 /* Return nonzero if the clock chip battery is low. */
495 static int __init has_low_battery(void)
496 {
497         void __iomem *regs = mstk48t02_regs;
498         u8 data1, data2;
499
500         spin_lock_irq(&mostek_lock);
501
502         data1 = mostek_read(regs + MOSTEK_EEPROM);      /* Read some data. */
503         mostek_write(regs + MOSTEK_EEPROM, ~data1);     /* Write back the complement. */
504         data2 = mostek_read(regs + MOSTEK_EEPROM);      /* Read back the complement. */
505         mostek_write(regs + MOSTEK_EEPROM, data1);      /* Restore original value. */
506
507         spin_unlock_irq(&mostek_lock);
508
509         return (data1 == data2);        /* Was the write blocked? */
510 }
511
512 static void __init mostek_set_system_time(void __iomem *mregs)
513 {
514         unsigned int year, mon, day, hour, min, sec;
515         u8 tmp;
516
517         spin_lock_irq(&mostek_lock);
518
519         /* Traditional Mostek chip. */
520         tmp = mostek_read(mregs + MOSTEK_CREG);
521         tmp |= MSTK_CREG_READ;
522         mostek_write(mregs + MOSTEK_CREG, tmp);
523
524         sec = MSTK_REG_SEC(mregs);
525         min = MSTK_REG_MIN(mregs);
526         hour = MSTK_REG_HOUR(mregs);
527         day = MSTK_REG_DOM(mregs);
528         mon = MSTK_REG_MONTH(mregs);
529         year = MSTK_CVT_YEAR( MSTK_REG_YEAR(mregs) );
530
531         xtime.tv_sec = mktime(year, mon, day, hour, min, sec);
532         xtime.tv_nsec = (INITIAL_JIFFIES % HZ) * (NSEC_PER_SEC / HZ);
533         set_normalized_timespec(&wall_to_monotonic,
534                                 -xtime.tv_sec, -xtime.tv_nsec);
535
536         tmp = mostek_read(mregs + MOSTEK_CREG);
537         tmp &= ~MSTK_CREG_READ;
538         mostek_write(mregs + MOSTEK_CREG, tmp);
539
540         spin_unlock_irq(&mostek_lock);
541 }
542
543 /* Probe for the real time clock chip. */
544 static void __init set_system_time(void)
545 {
546         unsigned int year, mon, day, hour, min, sec;
547         void __iomem *mregs = mstk48t02_regs;
548 #ifdef CONFIG_PCI
549         unsigned long dregs = ds1287_regs;
550         void __iomem *bregs = bq4802_regs;
551 #else
552         unsigned long dregs = 0UL;
553         void __iomem *bregs = 0UL;
554 #endif
555
556         if (!mregs && !dregs && !bregs) {
557                 prom_printf("Something wrong, clock regs not mapped yet.\n");
558                 prom_halt();
559         }               
560
561         if (mregs) {
562                 mostek_set_system_time(mregs);
563                 return;
564         }
565
566         if (bregs) {
567                 unsigned char val = readb(bregs + 0x0e);
568                 unsigned int century;
569
570                 /* BQ4802 RTC chip. */
571
572                 writeb(val | 0x08, bregs + 0x0e);
573
574                 sec  = readb(bregs + 0x00);
575                 min  = readb(bregs + 0x02);
576                 hour = readb(bregs + 0x04);
577                 day  = readb(bregs + 0x06);
578                 mon  = readb(bregs + 0x09);
579                 year = readb(bregs + 0x0a);
580                 century = readb(bregs + 0x0f);
581
582                 writeb(val, bregs + 0x0e);
583
584                 BCD_TO_BIN(sec);
585                 BCD_TO_BIN(min);
586                 BCD_TO_BIN(hour);
587                 BCD_TO_BIN(day);
588                 BCD_TO_BIN(mon);
589                 BCD_TO_BIN(year);
590                 BCD_TO_BIN(century);
591
592                 year += (century * 100);
593         } else {
594                 /* Dallas 12887 RTC chip. */
595
596                 do {
597                         sec  = CMOS_READ(RTC_SECONDS);
598                         min  = CMOS_READ(RTC_MINUTES);
599                         hour = CMOS_READ(RTC_HOURS);
600                         day  = CMOS_READ(RTC_DAY_OF_MONTH);
601                         mon  = CMOS_READ(RTC_MONTH);
602                         year = CMOS_READ(RTC_YEAR);
603                 } while (sec != CMOS_READ(RTC_SECONDS));
604
605                 if (!(CMOS_READ(RTC_CONTROL) & RTC_DM_BINARY) || RTC_ALWAYS_BCD) {
606                         BCD_TO_BIN(sec);
607                         BCD_TO_BIN(min);
608                         BCD_TO_BIN(hour);
609                         BCD_TO_BIN(day);
610                         BCD_TO_BIN(mon);
611                         BCD_TO_BIN(year);
612                 }
613                 if ((year += 1900) < 1970)
614                         year += 100;
615         }
616
617         xtime.tv_sec = mktime(year, mon, day, hour, min, sec);
618         xtime.tv_nsec = (INITIAL_JIFFIES % HZ) * (NSEC_PER_SEC / HZ);
619         set_normalized_timespec(&wall_to_monotonic,
620                                 -xtime.tv_sec, -xtime.tv_nsec);
621 }
622
623 /* davem suggests we keep this within the 4M locked kernel image */
624 static u32 starfire_get_time(void)
625 {
626         static char obp_gettod[32];
627         static u32 unix_tod;
628
629         sprintf(obp_gettod, "h# %08x unix-gettod",
630                 (unsigned int) (long) &unix_tod);
631         prom_feval(obp_gettod);
632
633         return unix_tod;
634 }
635
636 static int starfire_set_time(u32 val)
637 {
638         /* Do nothing, time is set using the service processor
639          * console on this platform.
640          */
641         return 0;
642 }
643
644 static u32 hypervisor_get_time(void)
645 {
646         unsigned long ret, time;
647         int retries = 10000;
648
649 retry:
650         ret = sun4v_tod_get(&time);
651         if (ret == HV_EOK)
652                 return time;
653         if (ret == HV_EWOULDBLOCK) {
654                 if (--retries > 0) {
655                         udelay(100);
656                         goto retry;
657                 }
658                 printk(KERN_WARNING "SUN4V: tod_get() timed out.\n");
659                 return 0;
660         }
661         printk(KERN_WARNING "SUN4V: tod_get() not supported.\n");
662         return 0;
663 }
664
665 static int hypervisor_set_time(u32 secs)
666 {
667         unsigned long ret;
668         int retries = 10000;
669
670 retry:
671         ret = sun4v_tod_set(secs);
672         if (ret == HV_EOK)
673                 return 0;
674         if (ret == HV_EWOULDBLOCK) {
675                 if (--retries > 0) {
676                         udelay(100);
677                         goto retry;
678                 }
679                 printk(KERN_WARNING "SUN4V: tod_set() timed out.\n");
680                 return -EAGAIN;
681         }
682         printk(KERN_WARNING "SUN4V: tod_set() not supported.\n");
683         return -EOPNOTSUPP;
684 }
685
686 static int __init clock_model_matches(const char *model)
687 {
688         if (strcmp(model, "mk48t02") &&
689             strcmp(model, "mk48t08") &&
690             strcmp(model, "mk48t59") &&
691             strcmp(model, "m5819") &&
692             strcmp(model, "m5819p") &&
693             strcmp(model, "m5823") &&
694             strcmp(model, "ds1287") &&
695             strcmp(model, "bq4802"))
696                 return 0;
697
698         return 1;
699 }
700
701 static int __devinit clock_probe(struct of_device *op, const struct of_device_id *match)
702 {
703         struct device_node *dp = op->node;
704         const char *model = of_get_property(dp, "model", NULL);
705         const char *compat = of_get_property(dp, "compatible", NULL);
706         unsigned long size, flags;
707         void __iomem *regs;
708
709         if (!model)
710                 model = compat;
711
712         if (!model || !clock_model_matches(model))
713                 return -ENODEV;
714
715         /* On an Enterprise system there can be multiple mostek clocks.
716          * We should only match the one that is on the central FHC bus.
717          */
718         if (!strcmp(dp->parent->name, "fhc") &&
719             strcmp(dp->parent->parent->name, "central") != 0)
720                 return -ENODEV;
721
722         size = (op->resource[0].end - op->resource[0].start) + 1;
723         regs = of_ioremap(&op->resource[0], 0, size, "clock");
724         if (!regs)
725                 return -ENOMEM;
726
727 #ifdef CONFIG_PCI
728         if (!strcmp(model, "ds1287") ||
729             !strcmp(model, "m5819") ||
730             !strcmp(model, "m5819p") ||
731             !strcmp(model, "m5823")) {
732                 ds1287_regs = (unsigned long) regs;
733         } else if (!strcmp(model, "bq4802")) {
734                 bq4802_regs = regs;
735         } else
736 #endif
737         if (model[5] == '0' && model[6] == '2') {
738                 mstk48t02_regs = regs;
739         } else if(model[5] == '0' && model[6] == '8') {
740                 mstk48t08_regs = regs;
741                 mstk48t02_regs = mstk48t08_regs + MOSTEK_48T08_48T02;
742         } else {
743                 mstk48t59_regs = regs;
744                 mstk48t02_regs = mstk48t59_regs + MOSTEK_48T59_48T02;
745         }
746
747         printk(KERN_INFO "%s: Clock regs at %p\n", dp->full_name, regs);
748
749         local_irq_save(flags);
750
751         if (mstk48t02_regs != NULL) {
752                 /* Report a low battery voltage condition. */
753                 if (has_low_battery())
754                         prom_printf("NVRAM: Low battery voltage!\n");
755
756                 /* Kick start the clock if it is completely stopped. */
757                 if (mostek_read(mstk48t02_regs + MOSTEK_SEC) & MSTK_STOP)
758                         kick_start_clock();
759         }
760
761         set_system_time();
762         
763         local_irq_restore(flags);
764
765         return 0;
766 }
767
768 static struct of_device_id clock_match[] = {
769         {
770                 .name = "eeprom",
771         },
772         {
773                 .name = "rtc",
774         },
775         {},
776 };
777
778 static struct of_platform_driver clock_driver = {
779         .match_table    = clock_match,
780         .probe          = clock_probe,
781         .driver         = {
782                 .name   = "clock",
783         },
784 };
785
786 static int __init clock_init(void)
787 {
788         if (this_is_starfire) {
789                 xtime.tv_sec = starfire_get_time();
790                 xtime.tv_nsec = (INITIAL_JIFFIES % HZ) * (NSEC_PER_SEC / HZ);
791                 set_normalized_timespec(&wall_to_monotonic,
792                                         -xtime.tv_sec, -xtime.tv_nsec);
793                 return 0;
794         }
795         if (tlb_type == hypervisor) {
796                 xtime.tv_sec = hypervisor_get_time();
797                 xtime.tv_nsec = (INITIAL_JIFFIES % HZ) * (NSEC_PER_SEC / HZ);
798                 set_normalized_timespec(&wall_to_monotonic,
799                                         -xtime.tv_sec, -xtime.tv_nsec);
800                 return 0;
801         }
802
803         return of_register_driver(&clock_driver, &of_platform_bus_type);
804 }
805
806 /* Must be after subsys_initcall() so that busses are probed.  Must
807  * be before device_initcall() because things like the RTC driver
808  * need to see the clock registers.
809  */
810 fs_initcall(clock_init);
811
812 /* This is gets the master TICK_INT timer going. */
813 static unsigned long sparc64_init_timers(void)
814 {
815         struct device_node *dp;
816         unsigned long clock;
817
818         dp = of_find_node_by_path("/");
819         if (tlb_type == spitfire) {
820                 unsigned long ver, manuf, impl;
821
822                 __asm__ __volatile__ ("rdpr %%ver, %0"
823                                       : "=&r" (ver));
824                 manuf = ((ver >> 48) & 0xffff);
825                 impl = ((ver >> 32) & 0xffff);
826                 if (manuf == 0x17 && impl == 0x13) {
827                         /* Hummingbird, aka Ultra-IIe */
828                         tick_ops = &hbtick_operations;
829                         clock = of_getintprop_default(dp, "stick-frequency", 0);
830                 } else {
831                         tick_ops = &tick_operations;
832                         clock = local_cpu_data().clock_tick;
833                 }
834         } else {
835                 tick_ops = &stick_operations;
836                 clock = of_getintprop_default(dp, "stick-frequency", 0);
837         }
838
839         return clock;
840 }
841
842 struct freq_table {
843         unsigned long clock_tick_ref;
844         unsigned int ref_freq;
845 };
846 static DEFINE_PER_CPU(struct freq_table, sparc64_freq_table) = { 0, 0 };
847
848 unsigned long sparc64_get_clock_tick(unsigned int cpu)
849 {
850         struct freq_table *ft = &per_cpu(sparc64_freq_table, cpu);
851
852         if (ft->clock_tick_ref)
853                 return ft->clock_tick_ref;
854         return cpu_data(cpu).clock_tick;
855 }
856
857 #ifdef CONFIG_CPU_FREQ
858
859 static int sparc64_cpufreq_notifier(struct notifier_block *nb, unsigned long val,
860                                     void *data)
861 {
862         struct cpufreq_freqs *freq = data;
863         unsigned int cpu = freq->cpu;
864         struct freq_table *ft = &per_cpu(sparc64_freq_table, cpu);
865
866         if (!ft->ref_freq) {
867                 ft->ref_freq = freq->old;
868                 ft->clock_tick_ref = cpu_data(cpu).clock_tick;
869         }
870         if ((val == CPUFREQ_PRECHANGE  && freq->old < freq->new) ||
871             (val == CPUFREQ_POSTCHANGE && freq->old > freq->new) ||
872             (val == CPUFREQ_RESUMECHANGE)) {
873                 cpu_data(cpu).clock_tick =
874                         cpufreq_scale(ft->clock_tick_ref,
875                                       ft->ref_freq,
876                                       freq->new);
877         }
878
879         return 0;
880 }
881
882 static struct notifier_block sparc64_cpufreq_notifier_block = {
883         .notifier_call  = sparc64_cpufreq_notifier
884 };
885
886 #endif /* CONFIG_CPU_FREQ */
887
888 static int sparc64_next_event(unsigned long delta,
889                               struct clock_event_device *evt)
890 {
891         return tick_ops->add_compare(delta) ? -ETIME : 0;
892 }
893
894 static void sparc64_timer_setup(enum clock_event_mode mode,
895                                 struct clock_event_device *evt)
896 {
897         switch (mode) {
898         case CLOCK_EVT_MODE_ONESHOT:
899         case CLOCK_EVT_MODE_RESUME:
900                 break;
901
902         case CLOCK_EVT_MODE_SHUTDOWN:
903                 tick_ops->disable_irq();
904                 break;
905
906         case CLOCK_EVT_MODE_PERIODIC:
907         case CLOCK_EVT_MODE_UNUSED:
908                 WARN_ON(1);
909                 break;
910         };
911 }
912
913 static struct clock_event_device sparc64_clockevent = {
914         .features       = CLOCK_EVT_FEAT_ONESHOT,
915         .set_mode       = sparc64_timer_setup,
916         .set_next_event = sparc64_next_event,
917         .rating         = 100,
918         .shift          = 30,
919         .irq            = -1,
920 };
921 static DEFINE_PER_CPU(struct clock_event_device, sparc64_events);
922
923 void timer_interrupt(int irq, struct pt_regs *regs)
924 {
925         struct pt_regs *old_regs = set_irq_regs(regs);
926         unsigned long tick_mask = tick_ops->softint_mask;
927         int cpu = smp_processor_id();
928         struct clock_event_device *evt = &per_cpu(sparc64_events, cpu);
929
930         clear_softint(tick_mask);
931
932         irq_enter();
933
934         kstat_this_cpu.irqs[0]++;
935
936         if (unlikely(!evt->event_handler)) {
937                 printk(KERN_WARNING
938                        "Spurious SPARC64 timer interrupt on cpu %d\n", cpu);
939         } else
940                 evt->event_handler(evt);
941
942         irq_exit();
943
944         set_irq_regs(old_regs);
945 }
946
947 void __devinit setup_sparc64_timer(void)
948 {
949         struct clock_event_device *sevt;
950         unsigned long pstate;
951
952         /* Guarantee that the following sequences execute
953          * uninterrupted.
954          */
955         __asm__ __volatile__("rdpr      %%pstate, %0\n\t"
956                              "wrpr      %0, %1, %%pstate"
957                              : "=r" (pstate)
958                              : "i" (PSTATE_IE));
959
960         tick_ops->init_tick();
961
962         /* Restore PSTATE_IE. */
963         __asm__ __volatile__("wrpr      %0, 0x0, %%pstate"
964                              : /* no outputs */
965                              : "r" (pstate));
966
967         sevt = &__get_cpu_var(sparc64_events);
968
969         memcpy(sevt, &sparc64_clockevent, sizeof(*sevt));
970         sevt->cpumask = cpumask_of_cpu(smp_processor_id());
971
972         clockevents_register_device(sevt);
973 }
974
975 #define SPARC64_NSEC_PER_CYC_SHIFT      10UL
976
977 static struct clocksource clocksource_tick = {
978         .rating         = 100,
979         .mask           = CLOCKSOURCE_MASK(64),
980         .shift          = 16,
981         .flags          = CLOCK_SOURCE_IS_CONTINUOUS,
982 };
983
984 static void __init setup_clockevent_multiplier(unsigned long hz)
985 {
986         unsigned long mult, shift = 32;
987
988         while (1) {
989                 mult = div_sc(hz, NSEC_PER_SEC, shift);
990                 if (mult && (mult >> 32UL) == 0UL)
991                         break;
992
993                 shift--;
994         }
995
996         sparc64_clockevent.shift = shift;
997         sparc64_clockevent.mult = mult;
998 }
999
1000 static unsigned long tb_ticks_per_usec __read_mostly;
1001
1002 void __delay(unsigned long loops)
1003 {
1004         unsigned long bclock, now;
1005
1006         bclock = tick_ops->get_tick();
1007         do {
1008                 now = tick_ops->get_tick();
1009         } while ((now-bclock) < loops);
1010 }
1011 EXPORT_SYMBOL(__delay);
1012
1013 void udelay(unsigned long usecs)
1014 {
1015         __delay(tb_ticks_per_usec * usecs);
1016 }
1017 EXPORT_SYMBOL(udelay);
1018
1019 void __init time_init(void)
1020 {
1021         unsigned long clock = sparc64_init_timers();
1022
1023         tb_ticks_per_usec = clock / USEC_PER_SEC;
1024
1025         timer_ticks_per_nsec_quotient =
1026                 clocksource_hz2mult(clock, SPARC64_NSEC_PER_CYC_SHIFT);
1027
1028         clocksource_tick.name = tick_ops->name;
1029         clocksource_tick.mult =
1030                 clocksource_hz2mult(clock,
1031                                     clocksource_tick.shift);
1032         clocksource_tick.read = tick_ops->get_tick;
1033
1034         printk("clocksource: mult[%x] shift[%d]\n",
1035                clocksource_tick.mult, clocksource_tick.shift);
1036
1037         clocksource_register(&clocksource_tick);
1038
1039         sparc64_clockevent.name = tick_ops->name;
1040
1041         setup_clockevent_multiplier(clock);
1042
1043         sparc64_clockevent.max_delta_ns =
1044                 clockevent_delta2ns(0x7fffffffffffffffUL, &sparc64_clockevent);
1045         sparc64_clockevent.min_delta_ns =
1046                 clockevent_delta2ns(0xF, &sparc64_clockevent);
1047
1048         printk("clockevent: mult[%lx] shift[%d]\n",
1049                sparc64_clockevent.mult, sparc64_clockevent.shift);
1050
1051         setup_sparc64_timer();
1052
1053 #ifdef CONFIG_CPU_FREQ
1054         cpufreq_register_notifier(&sparc64_cpufreq_notifier_block,
1055                                   CPUFREQ_TRANSITION_NOTIFIER);
1056 #endif
1057 }
1058
1059 unsigned long long sched_clock(void)
1060 {
1061         unsigned long ticks = tick_ops->get_tick();
1062
1063         return (ticks * timer_ticks_per_nsec_quotient)
1064                 >> SPARC64_NSEC_PER_CYC_SHIFT;
1065 }
1066
1067 static int set_rtc_mmss(unsigned long nowtime)
1068 {
1069         int real_seconds, real_minutes, chip_minutes;
1070         void __iomem *mregs = mstk48t02_regs;
1071 #ifdef CONFIG_PCI
1072         unsigned long dregs = ds1287_regs;
1073         void __iomem *bregs = bq4802_regs;
1074 #else
1075         unsigned long dregs = 0UL;
1076         void __iomem *bregs = 0UL;
1077 #endif
1078         unsigned long flags;
1079         u8 tmp;
1080
1081         /* 
1082          * Not having a register set can lead to trouble.
1083          * Also starfire doesn't have a tod clock.
1084          */
1085         if (!mregs && !dregs && !bregs)
1086                 return -1;
1087
1088         if (mregs) {
1089                 spin_lock_irqsave(&mostek_lock, flags);
1090
1091                 /* Read the current RTC minutes. */
1092                 tmp = mostek_read(mregs + MOSTEK_CREG);
1093                 tmp |= MSTK_CREG_READ;
1094                 mostek_write(mregs + MOSTEK_CREG, tmp);
1095
1096                 chip_minutes = MSTK_REG_MIN(mregs);
1097
1098                 tmp = mostek_read(mregs + MOSTEK_CREG);
1099                 tmp &= ~MSTK_CREG_READ;
1100                 mostek_write(mregs + MOSTEK_CREG, tmp);
1101
1102                 /*
1103                  * since we're only adjusting minutes and seconds,
1104                  * don't interfere with hour overflow. This avoids
1105                  * messing with unknown time zones but requires your
1106                  * RTC not to be off by more than 15 minutes
1107                  */
1108                 real_seconds = nowtime % 60;
1109                 real_minutes = nowtime / 60;
1110                 if (((abs(real_minutes - chip_minutes) + 15)/30) & 1)
1111                         real_minutes += 30;     /* correct for half hour time zone */
1112                 real_minutes %= 60;
1113
1114                 if (abs(real_minutes - chip_minutes) < 30) {
1115                         tmp = mostek_read(mregs + MOSTEK_CREG);
1116                         tmp |= MSTK_CREG_WRITE;
1117                         mostek_write(mregs + MOSTEK_CREG, tmp);
1118
1119                         MSTK_SET_REG_SEC(mregs,real_seconds);
1120                         MSTK_SET_REG_MIN(mregs,real_minutes);
1121
1122                         tmp = mostek_read(mregs + MOSTEK_CREG);
1123                         tmp &= ~MSTK_CREG_WRITE;
1124                         mostek_write(mregs + MOSTEK_CREG, tmp);
1125
1126                         spin_unlock_irqrestore(&mostek_lock, flags);
1127
1128                         return 0;
1129                 } else {
1130                         spin_unlock_irqrestore(&mostek_lock, flags);
1131
1132                         return -1;
1133                 }
1134         } else if (bregs) {
1135                 int retval = 0;
1136                 unsigned char val = readb(bregs + 0x0e);
1137
1138                 /* BQ4802 RTC chip. */
1139
1140                 writeb(val | 0x08, bregs + 0x0e);
1141
1142                 chip_minutes = readb(bregs + 0x02);
1143                 BCD_TO_BIN(chip_minutes);
1144                 real_seconds = nowtime % 60;
1145                 real_minutes = nowtime / 60;
1146                 if (((abs(real_minutes - chip_minutes) + 15)/30) & 1)
1147                         real_minutes += 30;
1148                 real_minutes %= 60;
1149
1150                 if (abs(real_minutes - chip_minutes) < 30) {
1151                         BIN_TO_BCD(real_seconds);
1152                         BIN_TO_BCD(real_minutes);
1153                         writeb(real_seconds, bregs + 0x00);
1154                         writeb(real_minutes, bregs + 0x02);
1155                 } else {
1156                         printk(KERN_WARNING
1157                                "set_rtc_mmss: can't update from %d to %d\n",
1158                                chip_minutes, real_minutes);
1159                         retval = -1;
1160                 }
1161
1162                 writeb(val, bregs + 0x0e);
1163
1164                 return retval;
1165         } else {
1166                 int retval = 0;
1167                 unsigned char save_control, save_freq_select;
1168
1169                 /* Stolen from arch/i386/kernel/time.c, see there for
1170                  * credits and descriptive comments.
1171                  */
1172                 spin_lock_irqsave(&rtc_lock, flags);
1173                 save_control = CMOS_READ(RTC_CONTROL); /* tell the clock it's being set */
1174                 CMOS_WRITE((save_control|RTC_SET), RTC_CONTROL);
1175
1176                 save_freq_select = CMOS_READ(RTC_FREQ_SELECT); /* stop and reset prescaler */
1177                 CMOS_WRITE((save_freq_select|RTC_DIV_RESET2), RTC_FREQ_SELECT);
1178
1179                 chip_minutes = CMOS_READ(RTC_MINUTES);
1180                 if (!(save_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD)
1181                         BCD_TO_BIN(chip_minutes);
1182                 real_seconds = nowtime % 60;
1183                 real_minutes = nowtime / 60;
1184                 if (((abs(real_minutes - chip_minutes) + 15)/30) & 1)
1185                         real_minutes += 30;
1186                 real_minutes %= 60;
1187
1188                 if (abs(real_minutes - chip_minutes) < 30) {
1189                         if (!(save_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD) {
1190                                 BIN_TO_BCD(real_seconds);
1191                                 BIN_TO_BCD(real_minutes);
1192                         }
1193                         CMOS_WRITE(real_seconds,RTC_SECONDS);
1194                         CMOS_WRITE(real_minutes,RTC_MINUTES);
1195                 } else {
1196                         printk(KERN_WARNING
1197                                "set_rtc_mmss: can't update from %d to %d\n",
1198                                chip_minutes, real_minutes);
1199                         retval = -1;
1200                 }
1201
1202                 CMOS_WRITE(save_control, RTC_CONTROL);
1203                 CMOS_WRITE(save_freq_select, RTC_FREQ_SELECT);
1204                 spin_unlock_irqrestore(&rtc_lock, flags);
1205
1206                 return retval;
1207         }
1208 }
1209
1210 #define RTC_IS_OPEN             0x01    /* means /dev/rtc is in use     */
1211 static unsigned char mini_rtc_status;   /* bitmapped status byte.       */
1212
1213 #define FEBRUARY        2
1214 #define STARTOFTIME     1970
1215 #define SECDAY          86400L
1216 #define SECYR           (SECDAY * 365)
1217 #define leapyear(year)          ((year) % 4 == 0 && \
1218                                  ((year) % 100 != 0 || (year) % 400 == 0))
1219 #define days_in_year(a)         (leapyear(a) ? 366 : 365)
1220 #define days_in_month(a)        (month_days[(a) - 1])
1221
1222 static int month_days[12] = {
1223         31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
1224 };
1225
1226 /*
1227  * This only works for the Gregorian calendar - i.e. after 1752 (in the UK)
1228  */
1229 static void GregorianDay(struct rtc_time * tm)
1230 {
1231         int leapsToDate;
1232         int lastYear;
1233         int day;
1234         int MonthOffset[] = { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334 };
1235
1236         lastYear = tm->tm_year - 1;
1237
1238         /*
1239          * Number of leap corrections to apply up to end of last year
1240          */
1241         leapsToDate = lastYear / 4 - lastYear / 100 + lastYear / 400;
1242
1243         /*
1244          * This year is a leap year if it is divisible by 4 except when it is
1245          * divisible by 100 unless it is divisible by 400
1246          *
1247          * e.g. 1904 was a leap year, 1900 was not, 1996 is, and 2000 was
1248          */
1249         day = tm->tm_mon > 2 && leapyear(tm->tm_year);
1250
1251         day += lastYear*365 + leapsToDate + MonthOffset[tm->tm_mon-1] +
1252                    tm->tm_mday;
1253
1254         tm->tm_wday = day % 7;
1255 }
1256
1257 static void to_tm(int tim, struct rtc_time *tm)
1258 {
1259         register int    i;
1260         register long   hms, day;
1261
1262         day = tim / SECDAY;
1263         hms = tim % SECDAY;
1264
1265         /* Hours, minutes, seconds are easy */
1266         tm->tm_hour = hms / 3600;
1267         tm->tm_min = (hms % 3600) / 60;
1268         tm->tm_sec = (hms % 3600) % 60;
1269
1270         /* Number of years in days */
1271         for (i = STARTOFTIME; day >= days_in_year(i); i++)
1272                 day -= days_in_year(i);
1273         tm->tm_year = i;
1274
1275         /* Number of months in days left */
1276         if (leapyear(tm->tm_year))
1277                 days_in_month(FEBRUARY) = 29;
1278         for (i = 1; day >= days_in_month(i); i++)
1279                 day -= days_in_month(i);
1280         days_in_month(FEBRUARY) = 28;
1281         tm->tm_mon = i;
1282
1283         /* Days are what is left over (+1) from all that. */
1284         tm->tm_mday = day + 1;
1285
1286         /*
1287          * Determine the day of week
1288          */
1289         GregorianDay(tm);
1290 }
1291
1292 /* Both Starfire and SUN4V give us seconds since Jan 1st, 1970,
1293  * aka Unix time.  So we have to convert to/from rtc_time.
1294  */
1295 static void starfire_get_rtc_time(struct rtc_time *time)
1296 {
1297         u32 seconds = starfire_get_time();
1298
1299         to_tm(seconds, time);
1300         time->tm_year -= 1900;
1301         time->tm_mon -= 1;
1302 }
1303
1304 static int starfire_set_rtc_time(struct rtc_time *time)
1305 {
1306         u32 seconds = mktime(time->tm_year + 1900, time->tm_mon + 1,
1307                              time->tm_mday, time->tm_hour,
1308                              time->tm_min, time->tm_sec);
1309
1310         return starfire_set_time(seconds);
1311 }
1312
1313 static void hypervisor_get_rtc_time(struct rtc_time *time)
1314 {
1315         u32 seconds = hypervisor_get_time();
1316
1317         to_tm(seconds, time);
1318         time->tm_year -= 1900;
1319         time->tm_mon -= 1;
1320 }
1321
1322 static int hypervisor_set_rtc_time(struct rtc_time *time)
1323 {
1324         u32 seconds = mktime(time->tm_year + 1900, time->tm_mon + 1,
1325                              time->tm_mday, time->tm_hour,
1326                              time->tm_min, time->tm_sec);
1327
1328         return hypervisor_set_time(seconds);
1329 }
1330
1331 #ifdef CONFIG_PCI
1332 static void bq4802_get_rtc_time(struct rtc_time *time)
1333 {
1334         unsigned char val = readb(bq4802_regs + 0x0e);
1335         unsigned int century;
1336
1337         writeb(val | 0x08, bq4802_regs + 0x0e);
1338
1339         time->tm_sec = readb(bq4802_regs + 0x00);
1340         time->tm_min = readb(bq4802_regs + 0x02);
1341         time->tm_hour = readb(bq4802_regs + 0x04);
1342         time->tm_mday = readb(bq4802_regs + 0x06);
1343         time->tm_mon = readb(bq4802_regs + 0x09);
1344         time->tm_year = readb(bq4802_regs + 0x0a);
1345         time->tm_wday = readb(bq4802_regs + 0x08);
1346         century = readb(bq4802_regs + 0x0f);
1347
1348         writeb(val, bq4802_regs + 0x0e);
1349
1350         BCD_TO_BIN(time->tm_sec);
1351         BCD_TO_BIN(time->tm_min);
1352         BCD_TO_BIN(time->tm_hour);
1353         BCD_TO_BIN(time->tm_mday);
1354         BCD_TO_BIN(time->tm_mon);
1355         BCD_TO_BIN(time->tm_year);
1356         BCD_TO_BIN(time->tm_wday);
1357         BCD_TO_BIN(century);
1358
1359         time->tm_year += (century * 100);
1360         time->tm_year -= 1900;
1361
1362         time->tm_mon--;
1363 }
1364
1365 static int bq4802_set_rtc_time(struct rtc_time *time)
1366 {
1367         unsigned char val = readb(bq4802_regs + 0x0e);
1368         unsigned char sec, min, hrs, day, mon, yrs, century;
1369         unsigned int year;
1370
1371         year = time->tm_year + 1900;
1372         century = year / 100;
1373         yrs = year % 100;
1374
1375         mon = time->tm_mon + 1;   /* tm_mon starts at zero */
1376         day = time->tm_mday;
1377         hrs = time->tm_hour;
1378         min = time->tm_min;
1379         sec = time->tm_sec;
1380
1381         BIN_TO_BCD(sec);
1382         BIN_TO_BCD(min);
1383         BIN_TO_BCD(hrs);
1384         BIN_TO_BCD(day);
1385         BIN_TO_BCD(mon);
1386         BIN_TO_BCD(yrs);
1387         BIN_TO_BCD(century);
1388
1389         writeb(val | 0x08, bq4802_regs + 0x0e);
1390
1391         writeb(sec, bq4802_regs + 0x00);
1392         writeb(min, bq4802_regs + 0x02);
1393         writeb(hrs, bq4802_regs + 0x04);
1394         writeb(day, bq4802_regs + 0x06);
1395         writeb(mon, bq4802_regs + 0x09);
1396         writeb(yrs, bq4802_regs + 0x0a);
1397         writeb(century, bq4802_regs + 0x0f);
1398
1399         writeb(val, bq4802_regs + 0x0e);
1400
1401         return 0;
1402 }
1403
1404 static void cmos_get_rtc_time(struct rtc_time *rtc_tm)
1405 {
1406         unsigned char ctrl;
1407
1408         rtc_tm->tm_sec = CMOS_READ(RTC_SECONDS);
1409         rtc_tm->tm_min = CMOS_READ(RTC_MINUTES);
1410         rtc_tm->tm_hour = CMOS_READ(RTC_HOURS);
1411         rtc_tm->tm_mday = CMOS_READ(RTC_DAY_OF_MONTH);
1412         rtc_tm->tm_mon = CMOS_READ(RTC_MONTH);
1413         rtc_tm->tm_year = CMOS_READ(RTC_YEAR);
1414         rtc_tm->tm_wday = CMOS_READ(RTC_DAY_OF_WEEK);
1415
1416         ctrl = CMOS_READ(RTC_CONTROL);
1417         if (!(ctrl & RTC_DM_BINARY) || RTC_ALWAYS_BCD) {
1418                 BCD_TO_BIN(rtc_tm->tm_sec);
1419                 BCD_TO_BIN(rtc_tm->tm_min);
1420                 BCD_TO_BIN(rtc_tm->tm_hour);
1421                 BCD_TO_BIN(rtc_tm->tm_mday);
1422                 BCD_TO_BIN(rtc_tm->tm_mon);
1423                 BCD_TO_BIN(rtc_tm->tm_year);
1424                 BCD_TO_BIN(rtc_tm->tm_wday);
1425         }
1426
1427         if (rtc_tm->tm_year <= 69)
1428                 rtc_tm->tm_year += 100;
1429
1430         rtc_tm->tm_mon--;
1431 }
1432
1433 static int cmos_set_rtc_time(struct rtc_time *rtc_tm)
1434 {
1435         unsigned char mon, day, hrs, min, sec;
1436         unsigned char save_control, save_freq_select;
1437         unsigned int yrs;
1438
1439         yrs = rtc_tm->tm_year;
1440         mon = rtc_tm->tm_mon + 1;
1441         day = rtc_tm->tm_mday;
1442         hrs = rtc_tm->tm_hour;
1443         min = rtc_tm->tm_min;
1444         sec = rtc_tm->tm_sec;
1445
1446         if (yrs >= 100)
1447                 yrs -= 100;
1448
1449         if (!(CMOS_READ(RTC_CONTROL) & RTC_DM_BINARY) || RTC_ALWAYS_BCD) {
1450                 BIN_TO_BCD(sec);
1451                 BIN_TO_BCD(min);
1452                 BIN_TO_BCD(hrs);
1453                 BIN_TO_BCD(day);
1454                 BIN_TO_BCD(mon);
1455                 BIN_TO_BCD(yrs);
1456         }
1457
1458         save_control = CMOS_READ(RTC_CONTROL);
1459         CMOS_WRITE((save_control|RTC_SET), RTC_CONTROL);
1460         save_freq_select = CMOS_READ(RTC_FREQ_SELECT);
1461         CMOS_WRITE((save_freq_select|RTC_DIV_RESET2), RTC_FREQ_SELECT);
1462
1463         CMOS_WRITE(yrs, RTC_YEAR);
1464         CMOS_WRITE(mon, RTC_MONTH);
1465         CMOS_WRITE(day, RTC_DAY_OF_MONTH);
1466         CMOS_WRITE(hrs, RTC_HOURS);
1467         CMOS_WRITE(min, RTC_MINUTES);
1468         CMOS_WRITE(sec, RTC_SECONDS);
1469
1470         CMOS_WRITE(save_control, RTC_CONTROL);
1471         CMOS_WRITE(save_freq_select, RTC_FREQ_SELECT);
1472
1473         return 0;
1474 }
1475 #endif /* CONFIG_PCI */
1476
1477 static void mostek_get_rtc_time(struct rtc_time *rtc_tm)
1478 {
1479         void __iomem *regs = mstk48t02_regs;
1480         u8 tmp;
1481
1482         spin_lock_irq(&mostek_lock);
1483
1484         tmp = mostek_read(regs + MOSTEK_CREG);
1485         tmp |= MSTK_CREG_READ;
1486         mostek_write(regs + MOSTEK_CREG, tmp);
1487
1488         rtc_tm->tm_sec = MSTK_REG_SEC(regs);
1489         rtc_tm->tm_min = MSTK_REG_MIN(regs);
1490         rtc_tm->tm_hour = MSTK_REG_HOUR(regs);
1491         rtc_tm->tm_mday = MSTK_REG_DOM(regs);
1492         rtc_tm->tm_mon = MSTK_REG_MONTH(regs);
1493         rtc_tm->tm_year = MSTK_CVT_YEAR( MSTK_REG_YEAR(regs) );
1494         rtc_tm->tm_wday = MSTK_REG_DOW(regs);
1495
1496         tmp = mostek_read(regs + MOSTEK_CREG);
1497         tmp &= ~MSTK_CREG_READ;
1498         mostek_write(regs + MOSTEK_CREG, tmp);
1499
1500         spin_unlock_irq(&mostek_lock);
1501
1502         rtc_tm->tm_mon--;
1503         rtc_tm->tm_wday--;
1504         rtc_tm->tm_year -= 1900;
1505 }
1506
1507 static int mostek_set_rtc_time(struct rtc_time *rtc_tm)
1508 {
1509         unsigned char mon, day, hrs, min, sec, wday;
1510         void __iomem *regs = mstk48t02_regs;
1511         unsigned int yrs;
1512         u8 tmp;
1513
1514         yrs = rtc_tm->tm_year + 1900;
1515         mon = rtc_tm->tm_mon + 1;
1516         day = rtc_tm->tm_mday;
1517         wday = rtc_tm->tm_wday + 1;
1518         hrs = rtc_tm->tm_hour;
1519         min = rtc_tm->tm_min;
1520         sec = rtc_tm->tm_sec;
1521
1522         spin_lock_irq(&mostek_lock);
1523
1524         tmp = mostek_read(regs + MOSTEK_CREG);
1525         tmp |= MSTK_CREG_WRITE;
1526         mostek_write(regs + MOSTEK_CREG, tmp);
1527
1528         MSTK_SET_REG_SEC(regs, sec);
1529         MSTK_SET_REG_MIN(regs, min);
1530         MSTK_SET_REG_HOUR(regs, hrs);
1531         MSTK_SET_REG_DOW(regs, wday);
1532         MSTK_SET_REG_DOM(regs, day);
1533         MSTK_SET_REG_MONTH(regs, mon);
1534         MSTK_SET_REG_YEAR(regs, yrs - MSTK_YEAR_ZERO);
1535
1536         tmp = mostek_read(regs + MOSTEK_CREG);
1537         tmp &= ~MSTK_CREG_WRITE;
1538         mostek_write(regs + MOSTEK_CREG, tmp);
1539
1540         spin_unlock_irq(&mostek_lock);
1541
1542         return 0;
1543 }
1544
1545 struct mini_rtc_ops {
1546         void (*get_rtc_time)(struct rtc_time *);
1547         int (*set_rtc_time)(struct rtc_time *);
1548 };
1549
1550 static struct mini_rtc_ops starfire_rtc_ops = {
1551         .get_rtc_time = starfire_get_rtc_time,
1552         .set_rtc_time = starfire_set_rtc_time,
1553 };
1554
1555 static struct mini_rtc_ops hypervisor_rtc_ops = {
1556         .get_rtc_time = hypervisor_get_rtc_time,
1557         .set_rtc_time = hypervisor_set_rtc_time,
1558 };
1559
1560 #ifdef CONFIG_PCI
1561 static struct mini_rtc_ops bq4802_rtc_ops = {
1562         .get_rtc_time = bq4802_get_rtc_time,
1563         .set_rtc_time = bq4802_set_rtc_time,
1564 };
1565
1566 static struct mini_rtc_ops cmos_rtc_ops = {
1567         .get_rtc_time = cmos_get_rtc_time,
1568         .set_rtc_time = cmos_set_rtc_time,
1569 };
1570 #endif /* CONFIG_PCI */
1571
1572 static struct mini_rtc_ops mostek_rtc_ops = {
1573         .get_rtc_time = mostek_get_rtc_time,
1574         .set_rtc_time = mostek_set_rtc_time,
1575 };
1576
1577 static struct mini_rtc_ops *mini_rtc_ops;
1578
1579 static inline void mini_get_rtc_time(struct rtc_time *time)
1580 {
1581         unsigned long flags;
1582
1583         spin_lock_irqsave(&rtc_lock, flags);
1584         mini_rtc_ops->get_rtc_time(time);
1585         spin_unlock_irqrestore(&rtc_lock, flags);
1586 }
1587
1588 static inline int mini_set_rtc_time(struct rtc_time *time)
1589 {
1590         unsigned long flags;
1591         int err;
1592
1593         spin_lock_irqsave(&rtc_lock, flags);
1594         err = mini_rtc_ops->set_rtc_time(time);
1595         spin_unlock_irqrestore(&rtc_lock, flags);
1596
1597         return err;
1598 }
1599
1600 static int mini_rtc_ioctl(struct inode *inode, struct file *file,
1601                           unsigned int cmd, unsigned long arg)
1602 {
1603         struct rtc_time wtime;
1604         void __user *argp = (void __user *)arg;
1605
1606         switch (cmd) {
1607
1608         case RTC_PLL_GET:
1609                 return -EINVAL;
1610
1611         case RTC_PLL_SET:
1612                 return -EINVAL;
1613
1614         case RTC_UIE_OFF:       /* disable ints from RTC updates.       */
1615                 return 0;
1616
1617         case RTC_UIE_ON:        /* enable ints for RTC updates. */
1618                 return -EINVAL;
1619
1620         case RTC_RD_TIME:       /* Read the time/date from RTC  */
1621                 /* this doesn't get week-day, who cares */
1622                 memset(&wtime, 0, sizeof(wtime));
1623                 mini_get_rtc_time(&wtime);
1624
1625                 return copy_to_user(argp, &wtime, sizeof(wtime)) ? -EFAULT : 0;
1626
1627         case RTC_SET_TIME:      /* Set the RTC */
1628             {
1629                 int year, days;
1630
1631                 if (!capable(CAP_SYS_TIME))
1632                         return -EACCES;
1633
1634                 if (copy_from_user(&wtime, argp, sizeof(wtime)))
1635                         return -EFAULT;
1636
1637                 year = wtime.tm_year + 1900;
1638                 days = month_days[wtime.tm_mon] +
1639                        ((wtime.tm_mon == 1) && leapyear(year));
1640
1641                 if ((wtime.tm_mon < 0 || wtime.tm_mon > 11) ||
1642                     (wtime.tm_mday < 1))
1643                         return -EINVAL;
1644
1645                 if (wtime.tm_mday < 0 || wtime.tm_mday > days)
1646                         return -EINVAL;
1647
1648                 if (wtime.tm_hour < 0 || wtime.tm_hour >= 24 ||
1649                     wtime.tm_min < 0 || wtime.tm_min >= 60 ||
1650                     wtime.tm_sec < 0 || wtime.tm_sec >= 60)
1651                         return -EINVAL;
1652
1653                 return mini_set_rtc_time(&wtime);
1654             }
1655         }
1656
1657         return -EINVAL;
1658 }
1659
1660 static int mini_rtc_open(struct inode *inode, struct file *file)
1661 {
1662         if (mini_rtc_status & RTC_IS_OPEN)
1663                 return -EBUSY;
1664
1665         mini_rtc_status |= RTC_IS_OPEN;
1666
1667         return 0;
1668 }
1669
1670 static int mini_rtc_release(struct inode *inode, struct file *file)
1671 {
1672         mini_rtc_status &= ~RTC_IS_OPEN;
1673         return 0;
1674 }
1675
1676
1677 static const struct file_operations mini_rtc_fops = {
1678         .owner          = THIS_MODULE,
1679         .ioctl          = mini_rtc_ioctl,
1680         .open           = mini_rtc_open,
1681         .release        = mini_rtc_release,
1682 };
1683
1684 static struct miscdevice rtc_mini_dev =
1685 {
1686         .minor          = RTC_MINOR,
1687         .name           = "rtc",
1688         .fops           = &mini_rtc_fops,
1689 };
1690
1691 static int __init rtc_mini_init(void)
1692 {
1693         int retval;
1694
1695         if (tlb_type == hypervisor)
1696                 mini_rtc_ops = &hypervisor_rtc_ops;
1697         else if (this_is_starfire)
1698                 mini_rtc_ops = &starfire_rtc_ops;
1699 #ifdef CONFIG_PCI
1700         else if (bq4802_regs)
1701                 mini_rtc_ops = &bq4802_rtc_ops;
1702         else if (ds1287_regs)
1703                 mini_rtc_ops = &cmos_rtc_ops;
1704 #endif /* CONFIG_PCI */
1705         else if (mstk48t02_regs)
1706                 mini_rtc_ops = &mostek_rtc_ops;
1707         else
1708                 return -ENODEV;
1709
1710         printk(KERN_INFO "Mini RTC Driver\n");
1711
1712         retval = misc_register(&rtc_mini_dev);
1713         if (retval < 0)
1714                 return retval;
1715
1716         return 0;
1717 }
1718
1719 static void __exit rtc_mini_exit(void)
1720 {
1721         misc_deregister(&rtc_mini_dev);
1722 }
1723
1724 int __devinit read_current_timer(unsigned long *timer_val)
1725 {
1726         *timer_val = tick_ops->get_tick();
1727         return 0;
1728 }
1729
1730 module_init(rtc_mini_init);
1731 module_exit(rtc_mini_exit);