Commit | Line | Data |
---|---|---|
cf3d7c1e | 1 | /* time.c: UltraSparc timer and TOD clock support. |
1da177e4 | 2 | * |
cf3d7c1e | 3 | * Copyright (C) 1997, 2008 David S. Miller (davem@davemloft.net) |
1da177e4 LT |
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 | ||
1da177e4 LT |
11 | #include <linux/errno.h> |
12 | #include <linux/module.h> | |
13 | #include <linux/sched.h> | |
09de3613 | 14 | #include <linux/smp_lock.h> |
1da177e4 LT |
15 | #include <linux/kernel.h> |
16 | #include <linux/param.h> | |
17 | #include <linux/string.h> | |
18 | #include <linux/mm.h> | |
19 | #include <linux/interrupt.h> | |
20 | #include <linux/time.h> | |
21 | #include <linux/timex.h> | |
22 | #include <linux/init.h> | |
23 | #include <linux/ioport.h> | |
24 | #include <linux/mc146818rtc.h> | |
25 | #include <linux/delay.h> | |
26 | #include <linux/profile.h> | |
27 | #include <linux/bcd.h> | |
28 | #include <linux/jiffies.h> | |
29 | #include <linux/cpufreq.h> | |
30 | #include <linux/percpu.h> | |
8ba706a9 DM |
31 | #include <linux/miscdevice.h> |
32 | #include <linux/rtc.h> | |
1518e7ed | 33 | #include <linux/rtc/m48t59.h> |
777a4475 | 34 | #include <linux/kernel_stat.h> |
112f4871 DM |
35 | #include <linux/clockchips.h> |
36 | #include <linux/clocksource.h> | |
764f2579 | 37 | #include <linux/of_device.h> |
1518e7ed | 38 | #include <linux/platform_device.h> |
1da177e4 LT |
39 | |
40 | #include <asm/oplib.h> | |
1da177e4 LT |
41 | #include <asm/timer.h> |
42 | #include <asm/irq.h> | |
43 | #include <asm/io.h> | |
ff0d2fc6 | 44 | #include <asm/prom.h> |
1da177e4 LT |
45 | #include <asm/starfire.h> |
46 | #include <asm/smp.h> | |
47 | #include <asm/sections.h> | |
48 | #include <asm/cpudata.h> | |
8ba706a9 | 49 | #include <asm/uaccess.h> |
63540ba3 | 50 | #include <asm/irq_regs.h> |
1da177e4 | 51 | |
cf3d7c1e DM |
52 | #include "entry.h" |
53 | ||
1da177e4 | 54 | DEFINE_SPINLOCK(rtc_lock); |
1da177e4 | 55 | |
1da177e4 | 56 | #define TICK_PRIV_BIT (1UL << 63) |
112f4871 | 57 | #define TICKCMP_IRQ_BIT (1UL << 63) |
1da177e4 LT |
58 | |
59 | #ifdef CONFIG_SMP | |
60 | unsigned long profile_pc(struct pt_regs *regs) | |
61 | { | |
62 | unsigned long pc = instruction_pointer(regs); | |
63 | ||
64 | if (in_lock_functions(pc)) | |
65 | return regs->u_regs[UREG_RETPC]; | |
66 | return pc; | |
67 | } | |
68 | EXPORT_SYMBOL(profile_pc); | |
69 | #endif | |
70 | ||
71 | static void tick_disable_protection(void) | |
72 | { | |
73 | /* Set things up so user can access tick register for profiling | |
74 | * purposes. Also workaround BB_ERRATA_1 by doing a dummy | |
75 | * read back of %tick after writing it. | |
76 | */ | |
77 | __asm__ __volatile__( | |
78 | " ba,pt %%xcc, 1f\n" | |
79 | " nop\n" | |
80 | " .align 64\n" | |
81 | "1: rd %%tick, %%g2\n" | |
82 | " add %%g2, 6, %%g2\n" | |
83 | " andn %%g2, %0, %%g2\n" | |
84 | " wrpr %%g2, 0, %%tick\n" | |
85 | " rdpr %%tick, %%g0" | |
86 | : /* no outputs */ | |
87 | : "r" (TICK_PRIV_BIT) | |
88 | : "g2"); | |
89 | } | |
90 | ||
112f4871 | 91 | static void tick_disable_irq(void) |
1da177e4 | 92 | { |
1da177e4 | 93 | __asm__ __volatile__( |
1da177e4 | 94 | " ba,pt %%xcc, 1f\n" |
112f4871 | 95 | " nop\n" |
1da177e4 | 96 | " .align 64\n" |
112f4871 | 97 | "1: wr %0, 0x0, %%tick_cmpr\n" |
1da177e4 LT |
98 | " rd %%tick_cmpr, %%g0" |
99 | : /* no outputs */ | |
112f4871 DM |
100 | : "r" (TICKCMP_IRQ_BIT)); |
101 | } | |
102 | ||
103 | static void tick_init_tick(void) | |
104 | { | |
105 | tick_disable_protection(); | |
106 | tick_disable_irq(); | |
1da177e4 LT |
107 | } |
108 | ||
109 | static unsigned long tick_get_tick(void) | |
110 | { | |
111 | unsigned long ret; | |
112 | ||
113 | __asm__ __volatile__("rd %%tick, %0\n\t" | |
114 | "mov %0, %0" | |
115 | : "=r" (ret)); | |
116 | ||
117 | return ret & ~TICK_PRIV_BIT; | |
118 | } | |
119 | ||
112f4871 | 120 | static int tick_add_compare(unsigned long adj) |
1da177e4 | 121 | { |
112f4871 | 122 | unsigned long orig_tick, new_tick, new_compare; |
1da177e4 | 123 | |
112f4871 DM |
124 | __asm__ __volatile__("rd %%tick, %0" |
125 | : "=r" (orig_tick)); | |
1da177e4 | 126 | |
112f4871 | 127 | orig_tick &= ~TICKCMP_IRQ_BIT; |
1da177e4 LT |
128 | |
129 | /* Workaround for Spitfire Errata (#54 I think??), I discovered | |
130 | * this via Sun BugID 4008234, mentioned in Solaris-2.5.1 patch | |
131 | * number 103640. | |
132 | * | |
133 | * On Blackbird writes to %tick_cmpr can fail, the | |
134 | * workaround seems to be to execute the wr instruction | |
135 | * at the start of an I-cache line, and perform a dummy | |
136 | * read back from %tick_cmpr right after writing to it. -DaveM | |
137 | */ | |
112f4871 DM |
138 | __asm__ __volatile__("ba,pt %%xcc, 1f\n\t" |
139 | " add %1, %2, %0\n\t" | |
1da177e4 LT |
140 | ".align 64\n" |
141 | "1:\n\t" | |
142 | "wr %0, 0, %%tick_cmpr\n\t" | |
112f4871 DM |
143 | "rd %%tick_cmpr, %%g0\n\t" |
144 | : "=r" (new_compare) | |
145 | : "r" (orig_tick), "r" (adj)); | |
146 | ||
147 | __asm__ __volatile__("rd %%tick, %0" | |
148 | : "=r" (new_tick)); | |
149 | new_tick &= ~TICKCMP_IRQ_BIT; | |
1da177e4 | 150 | |
112f4871 | 151 | return ((long)(new_tick - (orig_tick+adj))) > 0L; |
1da177e4 LT |
152 | } |
153 | ||
112f4871 | 154 | static unsigned long tick_add_tick(unsigned long adj) |
1da177e4 | 155 | { |
112f4871 | 156 | unsigned long new_tick; |
1da177e4 LT |
157 | |
158 | /* Also need to handle Blackbird bug here too. */ | |
159 | __asm__ __volatile__("rd %%tick, %0\n\t" | |
112f4871 | 160 | "add %0, %1, %0\n\t" |
1da177e4 | 161 | "wrpr %0, 0, %%tick\n\t" |
112f4871 DM |
162 | : "=&r" (new_tick) |
163 | : "r" (adj)); | |
1da177e4 LT |
164 | |
165 | return new_tick; | |
166 | } | |
167 | ||
d369ddd2 | 168 | static struct sparc64_tick_ops tick_operations __read_mostly = { |
112f4871 | 169 | .name = "tick", |
1da177e4 | 170 | .init_tick = tick_init_tick, |
112f4871 | 171 | .disable_irq = tick_disable_irq, |
1da177e4 | 172 | .get_tick = tick_get_tick, |
1da177e4 LT |
173 | .add_tick = tick_add_tick, |
174 | .add_compare = tick_add_compare, | |
175 | .softint_mask = 1UL << 0, | |
176 | }; | |
177 | ||
fc321495 DM |
178 | struct sparc64_tick_ops *tick_ops __read_mostly = &tick_operations; |
179 | ||
112f4871 DM |
180 | static void stick_disable_irq(void) |
181 | { | |
182 | __asm__ __volatile__( | |
183 | "wr %0, 0x0, %%asr25" | |
184 | : /* no outputs */ | |
185 | : "r" (TICKCMP_IRQ_BIT)); | |
186 | } | |
187 | ||
188 | static void stick_init_tick(void) | |
1da177e4 | 189 | { |
7aa62645 DM |
190 | /* Writes to the %tick and %stick register are not |
191 | * allowed on sun4v. The Hypervisor controls that | |
192 | * bit, per-strand. | |
193 | */ | |
194 | if (tlb_type != hypervisor) { | |
195 | tick_disable_protection(); | |
112f4871 | 196 | tick_disable_irq(); |
7aa62645 DM |
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 | } | |
1da177e4 | 207 | |
112f4871 | 208 | stick_disable_irq(); |
1da177e4 LT |
209 | } |
210 | ||
211 | static unsigned long stick_get_tick(void) | |
212 | { | |
213 | unsigned long ret; | |
214 | ||
215 | __asm__ __volatile__("rd %%asr24, %0" | |
216 | : "=r" (ret)); | |
217 | ||
218 | return ret & ~TICK_PRIV_BIT; | |
219 | } | |
220 | ||
112f4871 | 221 | static unsigned long stick_add_tick(unsigned long adj) |
1da177e4 | 222 | { |
112f4871 | 223 | unsigned long new_tick; |
1da177e4 LT |
224 | |
225 | __asm__ __volatile__("rd %%asr24, %0\n\t" | |
112f4871 | 226 | "add %0, %1, %0\n\t" |
1da177e4 | 227 | "wr %0, 0, %%asr24\n\t" |
112f4871 DM |
228 | : "=&r" (new_tick) |
229 | : "r" (adj)); | |
1da177e4 LT |
230 | |
231 | return new_tick; | |
232 | } | |
233 | ||
112f4871 | 234 | static int stick_add_compare(unsigned long adj) |
1da177e4 | 235 | { |
112f4871 | 236 | unsigned long orig_tick, new_tick; |
1da177e4 | 237 | |
112f4871 DM |
238 | __asm__ __volatile__("rd %%asr24, %0" |
239 | : "=r" (orig_tick)); | |
240 | orig_tick &= ~TICKCMP_IRQ_BIT; | |
241 | ||
242 | __asm__ __volatile__("wr %0, 0, %%asr25" | |
243 | : /* no outputs */ | |
244 | : "r" (orig_tick + adj)); | |
245 | ||
246 | __asm__ __volatile__("rd %%asr24, %0" | |
247 | : "=r" (new_tick)); | |
248 | new_tick &= ~TICKCMP_IRQ_BIT; | |
1da177e4 | 249 | |
112f4871 | 250 | return ((long)(new_tick - (orig_tick+adj))) > 0L; |
1da177e4 LT |
251 | } |
252 | ||
d369ddd2 | 253 | static struct sparc64_tick_ops stick_operations __read_mostly = { |
112f4871 | 254 | .name = "stick", |
1da177e4 | 255 | .init_tick = stick_init_tick, |
112f4871 | 256 | .disable_irq = stick_disable_irq, |
1da177e4 | 257 | .get_tick = stick_get_tick, |
1da177e4 LT |
258 | .add_tick = stick_add_tick, |
259 | .add_compare = stick_add_compare, | |
260 | .softint_mask = 1UL << 16, | |
261 | }; | |
262 | ||
263 | /* On Hummingbird the STICK/STICK_CMPR register is implemented | |
264 | * in I/O space. There are two 64-bit registers each, the | |
265 | * first holds the low 32-bits of the value and the second holds | |
266 | * the high 32-bits. | |
267 | * | |
268 | * Since STICK is constantly updating, we have to access it carefully. | |
269 | * | |
270 | * The sequence we use to read is: | |
9eb3394b RM |
271 | * 1) read high |
272 | * 2) read low | |
273 | * 3) read high again, if it rolled re-read both low and high again. | |
1da177e4 LT |
274 | * |
275 | * Writing STICK safely is also tricky: | |
276 | * 1) write low to zero | |
277 | * 2) write high | |
278 | * 3) write low | |
279 | */ | |
280 | #define HBIRD_STICKCMP_ADDR 0x1fe0000f060UL | |
281 | #define HBIRD_STICK_ADDR 0x1fe0000f070UL | |
282 | ||
283 | static unsigned long __hbird_read_stick(void) | |
284 | { | |
285 | unsigned long ret, tmp1, tmp2, tmp3; | |
9eb3394b | 286 | unsigned long addr = HBIRD_STICK_ADDR+8; |
1da177e4 | 287 | |
9eb3394b RM |
288 | __asm__ __volatile__("ldxa [%1] %5, %2\n" |
289 | "1:\n\t" | |
1da177e4 | 290 | "sub %1, 0x8, %1\n\t" |
9eb3394b RM |
291 | "ldxa [%1] %5, %3\n\t" |
292 | "add %1, 0x8, %1\n\t" | |
1da177e4 LT |
293 | "ldxa [%1] %5, %4\n\t" |
294 | "cmp %4, %2\n\t" | |
9eb3394b RM |
295 | "bne,a,pn %%xcc, 1b\n\t" |
296 | " mov %4, %2\n\t" | |
297 | "sllx %4, 32, %4\n\t" | |
1da177e4 LT |
298 | "or %3, %4, %0\n\t" |
299 | : "=&r" (ret), "=&r" (addr), | |
300 | "=&r" (tmp1), "=&r" (tmp2), "=&r" (tmp3) | |
301 | : "i" (ASI_PHYS_BYPASS_EC_E), "1" (addr)); | |
302 | ||
303 | return ret; | |
304 | } | |
305 | ||
1da177e4 LT |
306 | static void __hbird_write_stick(unsigned long val) |
307 | { | |
308 | unsigned long low = (val & 0xffffffffUL); | |
309 | unsigned long high = (val >> 32UL); | |
310 | unsigned long addr = HBIRD_STICK_ADDR; | |
311 | ||
312 | __asm__ __volatile__("stxa %%g0, [%0] %4\n\t" | |
313 | "add %0, 0x8, %0\n\t" | |
314 | "stxa %3, [%0] %4\n\t" | |
315 | "sub %0, 0x8, %0\n\t" | |
316 | "stxa %2, [%0] %4" | |
317 | : "=&r" (addr) | |
318 | : "0" (addr), "r" (low), "r" (high), | |
319 | "i" (ASI_PHYS_BYPASS_EC_E)); | |
320 | } | |
321 | ||
322 | static void __hbird_write_compare(unsigned long val) | |
323 | { | |
324 | unsigned long low = (val & 0xffffffffUL); | |
325 | unsigned long high = (val >> 32UL); | |
326 | unsigned long addr = HBIRD_STICKCMP_ADDR + 0x8UL; | |
327 | ||
328 | __asm__ __volatile__("stxa %3, [%0] %4\n\t" | |
329 | "sub %0, 0x8, %0\n\t" | |
330 | "stxa %2, [%0] %4" | |
331 | : "=&r" (addr) | |
332 | : "0" (addr), "r" (low), "r" (high), | |
333 | "i" (ASI_PHYS_BYPASS_EC_E)); | |
334 | } | |
335 | ||
112f4871 | 336 | static void hbtick_disable_irq(void) |
1da177e4 | 337 | { |
112f4871 DM |
338 | __hbird_write_compare(TICKCMP_IRQ_BIT); |
339 | } | |
1da177e4 | 340 | |
112f4871 DM |
341 | static void hbtick_init_tick(void) |
342 | { | |
1da177e4 LT |
343 | tick_disable_protection(); |
344 | ||
345 | /* XXX This seems to be necessary to 'jumpstart' Hummingbird | |
346 | * XXX into actually sending STICK interrupts. I think because | |
347 | * XXX of how we store %tick_cmpr in head.S this somehow resets the | |
348 | * XXX {TICK + STICK} interrupt mux. -DaveM | |
349 | */ | |
350 | __hbird_write_stick(__hbird_read_stick()); | |
351 | ||
112f4871 | 352 | hbtick_disable_irq(); |
1da177e4 LT |
353 | } |
354 | ||
355 | static unsigned long hbtick_get_tick(void) | |
356 | { | |
357 | return __hbird_read_stick() & ~TICK_PRIV_BIT; | |
358 | } | |
359 | ||
112f4871 | 360 | static unsigned long hbtick_add_tick(unsigned long adj) |
1da177e4 LT |
361 | { |
362 | unsigned long val; | |
363 | ||
364 | val = __hbird_read_stick() + adj; | |
365 | __hbird_write_stick(val); | |
366 | ||
1da177e4 LT |
367 | return val; |
368 | } | |
369 | ||
112f4871 | 370 | static int hbtick_add_compare(unsigned long adj) |
1da177e4 | 371 | { |
112f4871 DM |
372 | unsigned long val = __hbird_read_stick(); |
373 | unsigned long val2; | |
1da177e4 | 374 | |
112f4871 DM |
375 | val &= ~TICKCMP_IRQ_BIT; |
376 | val += adj; | |
1da177e4 LT |
377 | __hbird_write_compare(val); |
378 | ||
112f4871 DM |
379 | val2 = __hbird_read_stick() & ~TICKCMP_IRQ_BIT; |
380 | ||
381 | return ((long)(val2 - val)) > 0L; | |
1da177e4 LT |
382 | } |
383 | ||
d369ddd2 | 384 | static struct sparc64_tick_ops hbtick_operations __read_mostly = { |
112f4871 | 385 | .name = "hbtick", |
1da177e4 | 386 | .init_tick = hbtick_init_tick, |
112f4871 | 387 | .disable_irq = hbtick_disable_irq, |
1da177e4 | 388 | .get_tick = hbtick_get_tick, |
1da177e4 LT |
389 | .add_tick = hbtick_add_tick, |
390 | .add_compare = hbtick_add_compare, | |
391 | .softint_mask = 1UL << 0, | |
392 | }; | |
393 | ||
d369ddd2 | 394 | static unsigned long timer_ticks_per_nsec_quotient __read_mostly; |
1da177e4 | 395 | |
82644459 | 396 | int update_persistent_clock(struct timespec now) |
a58c9f3c | 397 | { |
a0b31b57 | 398 | struct rtc_device *rtc = rtc_class_open("rtc0"); |
90158d84 | 399 | int err = -1; |
a0b31b57 | 400 | |
088a3962 DM |
401 | if (rtc) { |
402 | err = rtc_set_mmss(rtc, now.tv_sec); | |
403 | rtc_class_close(rtc); | |
404 | } | |
a0b31b57 | 405 | |
90158d84 | 406 | return err; |
1da177e4 LT |
407 | } |
408 | ||
da86783d DM |
409 | unsigned long cmos_regs; |
410 | EXPORT_SYMBOL(cmos_regs); | |
690c8fd3 | 411 | |
d8ada0a2 | 412 | static struct resource rtc_cmos_resource; |
da86783d DM |
413 | |
414 | static struct platform_device rtc_cmos_device = { | |
415 | .name = "rtc_cmos", | |
416 | .id = -1, | |
417 | .resource = &rtc_cmos_resource, | |
418 | .num_resources = 1, | |
419 | }; | |
690c8fd3 | 420 | |
1518e7ed | 421 | static int __devinit rtc_probe(struct of_device *op, const struct of_device_id *match) |
690c8fd3 | 422 | { |
da86783d | 423 | struct resource *r; |
690c8fd3 | 424 | |
da86783d DM |
425 | printk(KERN_INFO "%s: RTC regs at 0x%lx\n", |
426 | op->node->full_name, op->resource[0].start); | |
d037e053 | 427 | |
da86783d DM |
428 | /* The CMOS RTC driver only accepts IORESOURCE_IO, so cons |
429 | * up a fake resource so that the probe works for all cases. | |
430 | * When the RTC is behind an ISA bus it will have IORESOURCE_IO | |
431 | * already, whereas when it's behind EBUS is will be IORESOURCE_MEM. | |
432 | */ | |
433 | ||
434 | r = &rtc_cmos_resource; | |
435 | r->flags = IORESOURCE_IO; | |
436 | r->name = op->resource[0].name; | |
437 | r->start = op->resource[0].start; | |
438 | r->end = op->resource[0].end; | |
439 | ||
440 | cmos_regs = op->resource[0].start; | |
441 | return platform_device_register(&rtc_cmos_device); | |
442 | } | |
443 | ||
fd098316 | 444 | static struct of_device_id __initdata rtc_match[] = { |
da86783d DM |
445 | { |
446 | .name = "rtc", | |
447 | .compatible = "m5819", | |
448 | }, | |
449 | { | |
450 | .name = "rtc", | |
451 | .compatible = "isa-m5819p", | |
452 | }, | |
453 | { | |
454 | .name = "rtc", | |
455 | .compatible = "isa-m5823p", | |
456 | }, | |
457 | { | |
458 | .name = "rtc", | |
459 | .compatible = "ds1287", | |
460 | }, | |
461 | {}, | |
462 | }; | |
463 | ||
464 | static struct of_platform_driver rtc_driver = { | |
465 | .match_table = rtc_match, | |
466 | .probe = rtc_probe, | |
467 | .driver = { | |
468 | .name = "rtc", | |
469 | }, | |
470 | }; | |
91521485 | 471 | |
29b503f1 DM |
472 | static struct platform_device rtc_bq4802_device = { |
473 | .name = "rtc-bq4802", | |
474 | .id = -1, | |
475 | .num_resources = 1, | |
476 | }; | |
477 | ||
da86783d DM |
478 | static int __devinit bq4802_probe(struct of_device *op, const struct of_device_id *match) |
479 | { | |
690c8fd3 | 480 | |
29b503f1 DM |
481 | printk(KERN_INFO "%s: BQ4802 regs at 0x%lx\n", |
482 | op->node->full_name, op->resource[0].start); | |
690c8fd3 | 483 | |
29b503f1 DM |
484 | rtc_bq4802_device.resource = &op->resource[0]; |
485 | return platform_device_register(&rtc_bq4802_device); | |
690c8fd3 | 486 | } |
690c8fd3 | 487 | |
fd098316 | 488 | static struct of_device_id __initdata bq4802_match[] = { |
ee5caf0e | 489 | { |
1518e7ed | 490 | .name = "rtc", |
da86783d | 491 | .compatible = "bq4802", |
1518e7ed | 492 | }, |
1518e7ed DM |
493 | }; |
494 | ||
da86783d DM |
495 | static struct of_platform_driver bq4802_driver = { |
496 | .match_table = bq4802_match, | |
497 | .probe = bq4802_probe, | |
1518e7ed | 498 | .driver = { |
da86783d | 499 | .name = "bq4802", |
ee5caf0e | 500 | }, |
1518e7ed DM |
501 | }; |
502 | ||
503 | static unsigned char mostek_read_byte(struct device *dev, u32 ofs) | |
504 | { | |
505 | struct platform_device *pdev = to_platform_device(dev); | |
12a9ee3c KH |
506 | void __iomem *regs = (void __iomem *) pdev->resource[0].start; |
507 | ||
508 | return readb(regs + ofs); | |
1518e7ed DM |
509 | } |
510 | ||
511 | static void mostek_write_byte(struct device *dev, u32 ofs, u8 val) | |
512 | { | |
513 | struct platform_device *pdev = to_platform_device(dev); | |
12a9ee3c KH |
514 | void __iomem *regs = (void __iomem *) pdev->resource[0].start; |
515 | ||
1518e7ed DM |
516 | writeb(val, regs + ofs); |
517 | } | |
518 | ||
519 | static struct m48t59_plat_data m48t59_data = { | |
520 | .read_byte = mostek_read_byte, | |
521 | .write_byte = mostek_write_byte, | |
522 | }; | |
523 | ||
524 | static struct platform_device m48t59_rtc = { | |
525 | .name = "rtc-m48t59", | |
526 | .id = 0, | |
527 | .num_resources = 1, | |
528 | .dev = { | |
529 | .platform_data = &m48t59_data, | |
530 | }, | |
531 | }; | |
532 | ||
533 | static int __devinit mostek_probe(struct of_device *op, const struct of_device_id *match) | |
534 | { | |
535 | struct device_node *dp = op->node; | |
536 | ||
537 | /* On an Enterprise system there can be multiple mostek clocks. | |
538 | * We should only match the one that is on the central FHC bus. | |
539 | */ | |
540 | if (!strcmp(dp->parent->name, "fhc") && | |
541 | strcmp(dp->parent->parent->name, "central") != 0) | |
542 | return -ENODEV; | |
543 | ||
544 | printk(KERN_INFO "%s: Mostek regs at 0x%lx\n", | |
545 | dp->full_name, op->resource[0].start); | |
546 | ||
547 | m48t59_rtc.resource = &op->resource[0]; | |
548 | return platform_device_register(&m48t59_rtc); | |
549 | } | |
550 | ||
fd098316 | 551 | static struct of_device_id __initdata mostek_match[] = { |
ee5caf0e | 552 | { |
1518e7ed | 553 | .name = "eeprom", |
ee5caf0e DM |
554 | }, |
555 | {}, | |
556 | }; | |
690c8fd3 | 557 | |
1518e7ed DM |
558 | static struct of_platform_driver mostek_driver = { |
559 | .match_table = mostek_match, | |
560 | .probe = mostek_probe, | |
a2cd1558 | 561 | .driver = { |
1518e7ed | 562 | .name = "mostek", |
a2cd1558 | 563 | }, |
ee5caf0e | 564 | }; |
690c8fd3 | 565 | |
84d6bd5e DM |
566 | static struct platform_device rtc_sun4v_device = { |
567 | .name = "rtc-sun4v", | |
568 | .id = -1, | |
569 | }; | |
570 | ||
f2be6de8 DM |
571 | static struct platform_device rtc_starfire_device = { |
572 | .name = "rtc-starfire", | |
573 | .id = -1, | |
574 | }; | |
575 | ||
ee5caf0e | 576 | static int __init clock_init(void) |
690c8fd3 | 577 | { |
f2be6de8 DM |
578 | if (this_is_starfire) |
579 | return platform_device_register(&rtc_starfire_device); | |
580 | ||
84d6bd5e DM |
581 | if (tlb_type == hypervisor) |
582 | return platform_device_register(&rtc_sun4v_device); | |
1da177e4 | 583 | |
1518e7ed DM |
584 | (void) of_register_driver(&rtc_driver, &of_platform_bus_type); |
585 | (void) of_register_driver(&mostek_driver, &of_platform_bus_type); | |
da86783d | 586 | (void) of_register_driver(&bq4802_driver, &of_platform_bus_type); |
1518e7ed DM |
587 | |
588 | return 0; | |
1da177e4 LT |
589 | } |
590 | ||
ee5caf0e DM |
591 | /* Must be after subsys_initcall() so that busses are probed. Must |
592 | * be before device_initcall() because things like the RTC driver | |
593 | * need to see the clock registers. | |
594 | */ | |
595 | fs_initcall(clock_init); | |
596 | ||
1da177e4 LT |
597 | /* This is gets the master TICK_INT timer going. */ |
598 | static unsigned long sparc64_init_timers(void) | |
599 | { | |
07f8e5f3 | 600 | struct device_node *dp; |
d8ada0a2 | 601 | unsigned long freq; |
1da177e4 | 602 | |
07f8e5f3 | 603 | dp = of_find_node_by_path("/"); |
1da177e4 LT |
604 | if (tlb_type == spitfire) { |
605 | unsigned long ver, manuf, impl; | |
606 | ||
607 | __asm__ __volatile__ ("rdpr %%ver, %0" | |
608 | : "=&r" (ver)); | |
609 | manuf = ((ver >> 48) & 0xffff); | |
610 | impl = ((ver >> 32) & 0xffff); | |
611 | if (manuf == 0x17 && impl == 0x13) { | |
612 | /* Hummingbird, aka Ultra-IIe */ | |
613 | tick_ops = &hbtick_operations; | |
d8ada0a2 | 614 | freq = of_getintprop_default(dp, "stick-frequency", 0); |
1da177e4 LT |
615 | } else { |
616 | tick_ops = &tick_operations; | |
d8ada0a2 | 617 | freq = local_cpu_data().clock_tick; |
1da177e4 LT |
618 | } |
619 | } else { | |
620 | tick_ops = &stick_operations; | |
d8ada0a2 | 621 | freq = of_getintprop_default(dp, "stick-frequency", 0); |
1da177e4 | 622 | } |
1da177e4 | 623 | |
d8ada0a2 | 624 | return freq; |
1da177e4 LT |
625 | } |
626 | ||
1da177e4 | 627 | struct freq_table { |
1da177e4 LT |
628 | unsigned long clock_tick_ref; |
629 | unsigned int ref_freq; | |
630 | }; | |
3763be32 | 631 | static DEFINE_PER_CPU(struct freq_table, sparc64_freq_table) = { 0, 0 }; |
1da177e4 LT |
632 | |
633 | unsigned long sparc64_get_clock_tick(unsigned int cpu) | |
634 | { | |
635 | struct freq_table *ft = &per_cpu(sparc64_freq_table, cpu); | |
636 | ||
637 | if (ft->clock_tick_ref) | |
638 | return ft->clock_tick_ref; | |
639 | return cpu_data(cpu).clock_tick; | |
640 | } | |
641 | ||
642 | #ifdef CONFIG_CPU_FREQ | |
643 | ||
644 | static int sparc64_cpufreq_notifier(struct notifier_block *nb, unsigned long val, | |
645 | void *data) | |
646 | { | |
647 | struct cpufreq_freqs *freq = data; | |
648 | unsigned int cpu = freq->cpu; | |
649 | struct freq_table *ft = &per_cpu(sparc64_freq_table, cpu); | |
650 | ||
651 | if (!ft->ref_freq) { | |
652 | ft->ref_freq = freq->old; | |
1da177e4 LT |
653 | ft->clock_tick_ref = cpu_data(cpu).clock_tick; |
654 | } | |
655 | if ((val == CPUFREQ_PRECHANGE && freq->old < freq->new) || | |
656 | (val == CPUFREQ_POSTCHANGE && freq->old > freq->new) || | |
657 | (val == CPUFREQ_RESUMECHANGE)) { | |
1da177e4 LT |
658 | cpu_data(cpu).clock_tick = |
659 | cpufreq_scale(ft->clock_tick_ref, | |
660 | ft->ref_freq, | |
661 | freq->new); | |
662 | } | |
663 | ||
664 | return 0; | |
665 | } | |
666 | ||
667 | static struct notifier_block sparc64_cpufreq_notifier_block = { | |
668 | .notifier_call = sparc64_cpufreq_notifier | |
669 | }; | |
670 | ||
7ae93f51 DM |
671 | static int __init register_sparc64_cpufreq_notifier(void) |
672 | { | |
673 | ||
674 | cpufreq_register_notifier(&sparc64_cpufreq_notifier_block, | |
675 | CPUFREQ_TRANSITION_NOTIFIER); | |
676 | return 0; | |
677 | } | |
678 | ||
679 | core_initcall(register_sparc64_cpufreq_notifier); | |
680 | ||
1da177e4 LT |
681 | #endif /* CONFIG_CPU_FREQ */ |
682 | ||
112f4871 DM |
683 | static int sparc64_next_event(unsigned long delta, |
684 | struct clock_event_device *evt) | |
685 | { | |
d62c6f09 | 686 | return tick_ops->add_compare(delta) ? -ETIME : 0; |
112f4871 DM |
687 | } |
688 | ||
689 | static void sparc64_timer_setup(enum clock_event_mode mode, | |
690 | struct clock_event_device *evt) | |
691 | { | |
692 | switch (mode) { | |
693 | case CLOCK_EVT_MODE_ONESHOT: | |
18de5bc4 | 694 | case CLOCK_EVT_MODE_RESUME: |
112f4871 DM |
695 | break; |
696 | ||
697 | case CLOCK_EVT_MODE_SHUTDOWN: | |
698 | tick_ops->disable_irq(); | |
699 | break; | |
700 | ||
701 | case CLOCK_EVT_MODE_PERIODIC: | |
702 | case CLOCK_EVT_MODE_UNUSED: | |
703 | WARN_ON(1); | |
704 | break; | |
705 | }; | |
706 | } | |
707 | ||
708 | static struct clock_event_device sparc64_clockevent = { | |
709 | .features = CLOCK_EVT_FEAT_ONESHOT, | |
710 | .set_mode = sparc64_timer_setup, | |
711 | .set_next_event = sparc64_next_event, | |
712 | .rating = 100, | |
713 | .shift = 30, | |
714 | .irq = -1, | |
1da177e4 | 715 | }; |
112f4871 | 716 | static DEFINE_PER_CPU(struct clock_event_device, sparc64_events); |
1da177e4 | 717 | |
112f4871 | 718 | void timer_interrupt(int irq, struct pt_regs *regs) |
1da177e4 | 719 | { |
112f4871 DM |
720 | struct pt_regs *old_regs = set_irq_regs(regs); |
721 | unsigned long tick_mask = tick_ops->softint_mask; | |
722 | int cpu = smp_processor_id(); | |
723 | struct clock_event_device *evt = &per_cpu(sparc64_events, cpu); | |
724 | ||
725 | clear_softint(tick_mask); | |
726 | ||
727 | irq_enter(); | |
728 | ||
729 | kstat_this_cpu.irqs[0]++; | |
730 | ||
731 | if (unlikely(!evt->event_handler)) { | |
732 | printk(KERN_WARNING | |
733 | "Spurious SPARC64 timer interrupt on cpu %d\n", cpu); | |
734 | } else | |
735 | evt->event_handler(evt); | |
736 | ||
737 | irq_exit(); | |
738 | ||
739 | set_irq_regs(old_regs); | |
740 | } | |
1da177e4 | 741 | |
112f4871 DM |
742 | void __devinit setup_sparc64_timer(void) |
743 | { | |
744 | struct clock_event_device *sevt; | |
745 | unsigned long pstate; | |
1da177e4 | 746 | |
112f4871 DM |
747 | /* Guarantee that the following sequences execute |
748 | * uninterrupted. | |
1da177e4 | 749 | */ |
112f4871 DM |
750 | __asm__ __volatile__("rdpr %%pstate, %0\n\t" |
751 | "wrpr %0, %1, %%pstate" | |
752 | : "=r" (pstate) | |
753 | : "i" (PSTATE_IE)); | |
754 | ||
755 | tick_ops->init_tick(); | |
756 | ||
757 | /* Restore PSTATE_IE. */ | |
758 | __asm__ __volatile__("wrpr %0, 0x0, %%pstate" | |
759 | : /* no outputs */ | |
760 | : "r" (pstate)); | |
761 | ||
762 | sevt = &__get_cpu_var(sparc64_events); | |
763 | ||
764 | memcpy(sevt, &sparc64_clockevent, sizeof(*sevt)); | |
765 | sevt->cpumask = cpumask_of_cpu(smp_processor_id()); | |
766 | ||
767 | clockevents_register_device(sevt); | |
768 | } | |
769 | ||
03983ab8 | 770 | #define SPARC64_NSEC_PER_CYC_SHIFT 10UL |
112f4871 DM |
771 | |
772 | static struct clocksource clocksource_tick = { | |
773 | .rating = 100, | |
774 | .mask = CLOCKSOURCE_MASK(64), | |
775 | .shift = 16, | |
776 | .flags = CLOCK_SOURCE_IS_CONTINUOUS, | |
777 | }; | |
778 | ||
779 | static void __init setup_clockevent_multiplier(unsigned long hz) | |
780 | { | |
781 | unsigned long mult, shift = 32; | |
782 | ||
783 | while (1) { | |
784 | mult = div_sc(hz, NSEC_PER_SEC, shift); | |
785 | if (mult && (mult >> 32UL) == 0UL) | |
786 | break; | |
787 | ||
788 | shift--; | |
789 | } | |
790 | ||
791 | sparc64_clockevent.shift = shift; | |
792 | sparc64_clockevent.mult = mult; | |
793 | } | |
794 | ||
8b99cfb8 DM |
795 | static unsigned long tb_ticks_per_usec __read_mostly; |
796 | ||
797 | void __delay(unsigned long loops) | |
798 | { | |
799 | unsigned long bclock, now; | |
800 | ||
801 | bclock = tick_ops->get_tick(); | |
802 | do { | |
803 | now = tick_ops->get_tick(); | |
804 | } while ((now-bclock) < loops); | |
805 | } | |
806 | EXPORT_SYMBOL(__delay); | |
807 | ||
808 | void udelay(unsigned long usecs) | |
809 | { | |
810 | __delay(tb_ticks_per_usec * usecs); | |
811 | } | |
812 | EXPORT_SYMBOL(udelay); | |
813 | ||
112f4871 DM |
814 | void __init time_init(void) |
815 | { | |
d8ada0a2 | 816 | unsigned long freq = sparc64_init_timers(); |
1da177e4 | 817 | |
d8ada0a2 | 818 | tb_ticks_per_usec = freq / USEC_PER_SEC; |
8b99cfb8 | 819 | |
1da177e4 | 820 | timer_ticks_per_nsec_quotient = |
d8ada0a2 | 821 | clocksource_hz2mult(freq, SPARC64_NSEC_PER_CYC_SHIFT); |
112f4871 DM |
822 | |
823 | clocksource_tick.name = tick_ops->name; | |
824 | clocksource_tick.mult = | |
d8ada0a2 | 825 | clocksource_hz2mult(freq, |
112f4871 DM |
826 | clocksource_tick.shift); |
827 | clocksource_tick.read = tick_ops->get_tick; | |
828 | ||
829 | printk("clocksource: mult[%x] shift[%d]\n", | |
830 | clocksource_tick.mult, clocksource_tick.shift); | |
831 | ||
832 | clocksource_register(&clocksource_tick); | |
833 | ||
834 | sparc64_clockevent.name = tick_ops->name; | |
835 | ||
d8ada0a2 | 836 | setup_clockevent_multiplier(freq); |
112f4871 DM |
837 | |
838 | sparc64_clockevent.max_delta_ns = | |
cf3d7c1e | 839 | clockevent_delta2ns(0x7fffffffffffffffUL, &sparc64_clockevent); |
112f4871 DM |
840 | sparc64_clockevent.min_delta_ns = |
841 | clockevent_delta2ns(0xF, &sparc64_clockevent); | |
842 | ||
843 | printk("clockevent: mult[%lx] shift[%d]\n", | |
844 | sparc64_clockevent.mult, sparc64_clockevent.shift); | |
845 | ||
846 | setup_sparc64_timer(); | |
1da177e4 LT |
847 | } |
848 | ||
849 | unsigned long long sched_clock(void) | |
850 | { | |
851 | unsigned long ticks = tick_ops->get_tick(); | |
852 | ||
853 | return (ticks * timer_ticks_per_nsec_quotient) | |
854 | >> SPARC64_NSEC_PER_CYC_SHIFT; | |
855 | } | |
856 | ||
941e492b AM |
857 | int __devinit read_current_timer(unsigned long *timer_val) |
858 | { | |
859 | *timer_val = tick_ops->get_tick(); | |
860 | return 0; | |
861 | } |