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Commit | Line | Data |
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5d0cf410 | 1 | #include <linux/clocksource.h> |
e9e2cdb4 | 2 | #include <linux/clockchips.h> |
4588c1f0 IM |
3 | #include <linux/interrupt.h> |
4 | #include <linux/sysdev.h> | |
28769149 | 5 | #include <linux/delay.h> |
5d0cf410 JS |
6 | #include <linux/errno.h> |
7 | #include <linux/hpet.h> | |
8 | #include <linux/init.h> | |
58ac1e76 | 9 | #include <linux/cpu.h> |
4588c1f0 IM |
10 | #include <linux/pm.h> |
11 | #include <linux/io.h> | |
5d0cf410 | 12 | |
28769149 | 13 | #include <asm/fixmap.h> |
06a24dec | 14 | #include <asm/i8253.h> |
4588c1f0 | 15 | #include <asm/hpet.h> |
5d0cf410 | 16 | |
4588c1f0 IM |
17 | #define HPET_MASK CLOCKSOURCE_MASK(32) |
18 | #define HPET_SHIFT 22 | |
5d0cf410 | 19 | |
b10db7f0 PM |
20 | /* FSEC = 10^-15 |
21 | NSEC = 10^-9 */ | |
4588c1f0 | 22 | #define FSEC_PER_NSEC 1000000L |
5d0cf410 | 23 | |
26afe5f2 | 24 | #define HPET_DEV_USED_BIT 2 |
25 | #define HPET_DEV_USED (1 << HPET_DEV_USED_BIT) | |
26 | #define HPET_DEV_VALID 0x8 | |
27 | #define HPET_DEV_FSB_CAP 0x1000 | |
28 | #define HPET_DEV_PERI_CAP 0x2000 | |
29 | ||
30 | #define EVT_TO_HPET_DEV(evt) container_of(evt, struct hpet_dev, evt) | |
31 | ||
e9e2cdb4 TG |
32 | /* |
33 | * HPET address is set in acpi/boot.c, when an ACPI entry exists | |
34 | */ | |
4588c1f0 | 35 | unsigned long hpet_address; |
e951e4af | 36 | #ifdef CONFIG_PCI_MSI |
3b71e9e3 | 37 | static unsigned long hpet_num_timers; |
e951e4af | 38 | #endif |
4588c1f0 | 39 | static void __iomem *hpet_virt_address; |
e9e2cdb4 | 40 | |
58ac1e76 | 41 | struct hpet_dev { |
4588c1f0 IM |
42 | struct clock_event_device evt; |
43 | unsigned int num; | |
44 | int cpu; | |
45 | unsigned int irq; | |
46 | unsigned int flags; | |
47 | char name[10]; | |
58ac1e76 | 48 | }; |
49 | ||
31c435d7 | 50 | unsigned long hpet_readl(unsigned long a) |
e9e2cdb4 TG |
51 | { |
52 | return readl(hpet_virt_address + a); | |
53 | } | |
54 | ||
55 | static inline void hpet_writel(unsigned long d, unsigned long a) | |
56 | { | |
57 | writel(d, hpet_virt_address + a); | |
58 | } | |
59 | ||
28769149 | 60 | #ifdef CONFIG_X86_64 |
28769149 | 61 | #include <asm/pgtable.h> |
2387ce57 | 62 | #endif |
28769149 | 63 | |
06a24dec TG |
64 | static inline void hpet_set_mapping(void) |
65 | { | |
66 | hpet_virt_address = ioremap_nocache(hpet_address, HPET_MMAP_SIZE); | |
2387ce57 YL |
67 | #ifdef CONFIG_X86_64 |
68 | __set_fixmap(VSYSCALL_HPET, hpet_address, PAGE_KERNEL_VSYSCALL_NOCACHE); | |
69 | #endif | |
06a24dec TG |
70 | } |
71 | ||
72 | static inline void hpet_clear_mapping(void) | |
73 | { | |
74 | iounmap(hpet_virt_address); | |
75 | hpet_virt_address = NULL; | |
76 | } | |
77 | ||
e9e2cdb4 TG |
78 | /* |
79 | * HPET command line enable / disable | |
80 | */ | |
81 | static int boot_hpet_disable; | |
b17530bd | 82 | int hpet_force_user; |
b98103a5 | 83 | static int hpet_verbose; |
e9e2cdb4 | 84 | |
4588c1f0 | 85 | static int __init hpet_setup(char *str) |
e9e2cdb4 TG |
86 | { |
87 | if (str) { | |
88 | if (!strncmp("disable", str, 7)) | |
89 | boot_hpet_disable = 1; | |
b17530bd TG |
90 | if (!strncmp("force", str, 5)) |
91 | hpet_force_user = 1; | |
b98103a5 AH |
92 | if (!strncmp("verbose", str, 7)) |
93 | hpet_verbose = 1; | |
e9e2cdb4 TG |
94 | } |
95 | return 1; | |
96 | } | |
97 | __setup("hpet=", hpet_setup); | |
98 | ||
28769149 TG |
99 | static int __init disable_hpet(char *str) |
100 | { | |
101 | boot_hpet_disable = 1; | |
102 | return 1; | |
103 | } | |
104 | __setup("nohpet", disable_hpet); | |
105 | ||
e9e2cdb4 TG |
106 | static inline int is_hpet_capable(void) |
107 | { | |
4588c1f0 | 108 | return !boot_hpet_disable && hpet_address; |
e9e2cdb4 TG |
109 | } |
110 | ||
111 | /* | |
112 | * HPET timer interrupt enable / disable | |
113 | */ | |
114 | static int hpet_legacy_int_enabled; | |
115 | ||
116 | /** | |
117 | * is_hpet_enabled - check whether the hpet timer interrupt is enabled | |
118 | */ | |
119 | int is_hpet_enabled(void) | |
120 | { | |
121 | return is_hpet_capable() && hpet_legacy_int_enabled; | |
122 | } | |
1bdbdaac | 123 | EXPORT_SYMBOL_GPL(is_hpet_enabled); |
e9e2cdb4 | 124 | |
b98103a5 AH |
125 | static void _hpet_print_config(const char *function, int line) |
126 | { | |
127 | u32 i, timers, l, h; | |
128 | printk(KERN_INFO "hpet: %s(%d):\n", function, line); | |
129 | l = hpet_readl(HPET_ID); | |
130 | h = hpet_readl(HPET_PERIOD); | |
131 | timers = ((l & HPET_ID_NUMBER) >> HPET_ID_NUMBER_SHIFT) + 1; | |
132 | printk(KERN_INFO "hpet: ID: 0x%x, PERIOD: 0x%x\n", l, h); | |
133 | l = hpet_readl(HPET_CFG); | |
134 | h = hpet_readl(HPET_STATUS); | |
135 | printk(KERN_INFO "hpet: CFG: 0x%x, STATUS: 0x%x\n", l, h); | |
136 | l = hpet_readl(HPET_COUNTER); | |
137 | h = hpet_readl(HPET_COUNTER+4); | |
138 | printk(KERN_INFO "hpet: COUNTER_l: 0x%x, COUNTER_h: 0x%x\n", l, h); | |
139 | ||
140 | for (i = 0; i < timers; i++) { | |
141 | l = hpet_readl(HPET_Tn_CFG(i)); | |
142 | h = hpet_readl(HPET_Tn_CFG(i)+4); | |
143 | printk(KERN_INFO "hpet: T%d: CFG_l: 0x%x, CFG_h: 0x%x\n", | |
144 | i, l, h); | |
145 | l = hpet_readl(HPET_Tn_CMP(i)); | |
146 | h = hpet_readl(HPET_Tn_CMP(i)+4); | |
147 | printk(KERN_INFO "hpet: T%d: CMP_l: 0x%x, CMP_h: 0x%x\n", | |
148 | i, l, h); | |
149 | l = hpet_readl(HPET_Tn_ROUTE(i)); | |
150 | h = hpet_readl(HPET_Tn_ROUTE(i)+4); | |
151 | printk(KERN_INFO "hpet: T%d ROUTE_l: 0x%x, ROUTE_h: 0x%x\n", | |
152 | i, l, h); | |
153 | } | |
154 | } | |
155 | ||
156 | #define hpet_print_config() \ | |
157 | do { \ | |
158 | if (hpet_verbose) \ | |
159 | _hpet_print_config(__FUNCTION__, __LINE__); \ | |
160 | } while (0) | |
161 | ||
e9e2cdb4 TG |
162 | /* |
163 | * When the hpet driver (/dev/hpet) is enabled, we need to reserve | |
164 | * timer 0 and timer 1 in case of RTC emulation. | |
165 | */ | |
166 | #ifdef CONFIG_HPET | |
f0ed4e69 | 167 | |
5f79f2f2 | 168 | static void hpet_reserve_msi_timers(struct hpet_data *hd); |
f0ed4e69 | 169 | |
e9e2cdb4 TG |
170 | static void hpet_reserve_platform_timers(unsigned long id) |
171 | { | |
172 | struct hpet __iomem *hpet = hpet_virt_address; | |
37a47db8 BR |
173 | struct hpet_timer __iomem *timer = &hpet->hpet_timers[2]; |
174 | unsigned int nrtimers, i; | |
e9e2cdb4 TG |
175 | struct hpet_data hd; |
176 | ||
177 | nrtimers = ((id & HPET_ID_NUMBER) >> HPET_ID_NUMBER_SHIFT) + 1; | |
178 | ||
4588c1f0 IM |
179 | memset(&hd, 0, sizeof(hd)); |
180 | hd.hd_phys_address = hpet_address; | |
181 | hd.hd_address = hpet; | |
182 | hd.hd_nirqs = nrtimers; | |
e9e2cdb4 TG |
183 | hpet_reserve_timer(&hd, 0); |
184 | ||
185 | #ifdef CONFIG_HPET_EMULATE_RTC | |
186 | hpet_reserve_timer(&hd, 1); | |
187 | #endif | |
5761d64b | 188 | |
64a76f66 DB |
189 | /* |
190 | * NOTE that hd_irq[] reflects IOAPIC input pins (LEGACY_8254 | |
191 | * is wrong for i8259!) not the output IRQ. Many BIOS writers | |
192 | * don't bother configuring *any* comparator interrupts. | |
193 | */ | |
e9e2cdb4 TG |
194 | hd.hd_irq[0] = HPET_LEGACY_8254; |
195 | hd.hd_irq[1] = HPET_LEGACY_RTC; | |
196 | ||
fc3fbc45 | 197 | for (i = 2; i < nrtimers; timer++, i++) { |
4588c1f0 IM |
198 | hd.hd_irq[i] = (readl(&timer->hpet_config) & |
199 | Tn_INT_ROUTE_CNF_MASK) >> Tn_INT_ROUTE_CNF_SHIFT; | |
fc3fbc45 | 200 | } |
5761d64b | 201 | |
f0ed4e69 | 202 | hpet_reserve_msi_timers(&hd); |
26afe5f2 | 203 | |
e9e2cdb4 | 204 | hpet_alloc(&hd); |
5761d64b | 205 | |
e9e2cdb4 TG |
206 | } |
207 | #else | |
208 | static void hpet_reserve_platform_timers(unsigned long id) { } | |
209 | #endif | |
210 | ||
211 | /* | |
212 | * Common hpet info | |
213 | */ | |
214 | static unsigned long hpet_period; | |
215 | ||
610bf2f1 | 216 | static void hpet_legacy_set_mode(enum clock_event_mode mode, |
e9e2cdb4 | 217 | struct clock_event_device *evt); |
610bf2f1 | 218 | static int hpet_legacy_next_event(unsigned long delta, |
e9e2cdb4 TG |
219 | struct clock_event_device *evt); |
220 | ||
221 | /* | |
222 | * The hpet clock event device | |
223 | */ | |
224 | static struct clock_event_device hpet_clockevent = { | |
225 | .name = "hpet", | |
226 | .features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT, | |
610bf2f1 VP |
227 | .set_mode = hpet_legacy_set_mode, |
228 | .set_next_event = hpet_legacy_next_event, | |
e9e2cdb4 TG |
229 | .shift = 32, |
230 | .irq = 0, | |
59c69f2a | 231 | .rating = 50, |
e9e2cdb4 TG |
232 | }; |
233 | ||
8d6f0c82 | 234 | static void hpet_stop_counter(void) |
e9e2cdb4 TG |
235 | { |
236 | unsigned long cfg = hpet_readl(HPET_CFG); | |
e9e2cdb4 TG |
237 | cfg &= ~HPET_CFG_ENABLE; |
238 | hpet_writel(cfg, HPET_CFG); | |
7a6f9cbb AH |
239 | } |
240 | ||
241 | static void hpet_reset_counter(void) | |
242 | { | |
e9e2cdb4 TG |
243 | hpet_writel(0, HPET_COUNTER); |
244 | hpet_writel(0, HPET_COUNTER + 4); | |
8d6f0c82 AH |
245 | } |
246 | ||
247 | static void hpet_start_counter(void) | |
248 | { | |
249 | unsigned long cfg = hpet_readl(HPET_CFG); | |
e9e2cdb4 TG |
250 | cfg |= HPET_CFG_ENABLE; |
251 | hpet_writel(cfg, HPET_CFG); | |
252 | } | |
253 | ||
8d6f0c82 AH |
254 | static void hpet_restart_counter(void) |
255 | { | |
256 | hpet_stop_counter(); | |
7a6f9cbb | 257 | hpet_reset_counter(); |
8d6f0c82 AH |
258 | hpet_start_counter(); |
259 | } | |
260 | ||
59c69f2a VP |
261 | static void hpet_resume_device(void) |
262 | { | |
bfe0c1cc | 263 | force_hpet_resume(); |
59c69f2a VP |
264 | } |
265 | ||
8d6f0c82 | 266 | static void hpet_resume_counter(void) |
59c69f2a VP |
267 | { |
268 | hpet_resume_device(); | |
8d6f0c82 | 269 | hpet_restart_counter(); |
59c69f2a VP |
270 | } |
271 | ||
610bf2f1 | 272 | static void hpet_enable_legacy_int(void) |
e9e2cdb4 TG |
273 | { |
274 | unsigned long cfg = hpet_readl(HPET_CFG); | |
275 | ||
276 | cfg |= HPET_CFG_LEGACY; | |
277 | hpet_writel(cfg, HPET_CFG); | |
278 | hpet_legacy_int_enabled = 1; | |
279 | } | |
280 | ||
610bf2f1 VP |
281 | static void hpet_legacy_clockevent_register(void) |
282 | { | |
610bf2f1 VP |
283 | /* Start HPET legacy interrupts */ |
284 | hpet_enable_legacy_int(); | |
285 | ||
286 | /* | |
6fd592da CM |
287 | * The mult factor is defined as (include/linux/clockchips.h) |
288 | * mult/2^shift = cyc/ns (in contrast to ns/cyc in clocksource.h) | |
289 | * hpet_period is in units of femtoseconds (per cycle), so | |
290 | * mult/2^shift = cyc/ns = 10^6/hpet_period | |
291 | * mult = (10^6 * 2^shift)/hpet_period | |
292 | * mult = (FSEC_PER_NSEC << hpet_clockevent.shift)/hpet_period | |
610bf2f1 | 293 | */ |
6fd592da CM |
294 | hpet_clockevent.mult = div_sc((unsigned long) FSEC_PER_NSEC, |
295 | hpet_period, hpet_clockevent.shift); | |
610bf2f1 VP |
296 | /* Calculate the min / max delta */ |
297 | hpet_clockevent.max_delta_ns = clockevent_delta2ns(0x7FFFFFFF, | |
298 | &hpet_clockevent); | |
7cfb0435 TG |
299 | /* 5 usec minimum reprogramming delta. */ |
300 | hpet_clockevent.min_delta_ns = 5000; | |
610bf2f1 VP |
301 | |
302 | /* | |
303 | * Start hpet with the boot cpu mask and make it | |
304 | * global after the IO_APIC has been initialized. | |
305 | */ | |
320ab2b0 | 306 | hpet_clockevent.cpumask = cpumask_of(smp_processor_id()); |
610bf2f1 VP |
307 | clockevents_register_device(&hpet_clockevent); |
308 | global_clock_event = &hpet_clockevent; | |
309 | printk(KERN_DEBUG "hpet clockevent registered\n"); | |
310 | } | |
311 | ||
26afe5f2 | 312 | static int hpet_setup_msi_irq(unsigned int irq); |
313 | ||
b40d575b | 314 | static void hpet_set_mode(enum clock_event_mode mode, |
315 | struct clock_event_device *evt, int timer) | |
e9e2cdb4 | 316 | { |
7a6f9cbb | 317 | unsigned long cfg, cmp, now; |
e9e2cdb4 TG |
318 | uint64_t delta; |
319 | ||
4588c1f0 | 320 | switch (mode) { |
e9e2cdb4 | 321 | case CLOCK_EVT_MODE_PERIODIC: |
c23e253e | 322 | hpet_stop_counter(); |
b40d575b | 323 | delta = ((uint64_t)(NSEC_PER_SEC/HZ)) * evt->mult; |
324 | delta >>= evt->shift; | |
7a6f9cbb AH |
325 | now = hpet_readl(HPET_COUNTER); |
326 | cmp = now + (unsigned long) delta; | |
b40d575b | 327 | cfg = hpet_readl(HPET_Tn_CFG(timer)); |
b13e2464 JS |
328 | /* Make sure we use edge triggered interrupts */ |
329 | cfg &= ~HPET_TN_LEVEL; | |
e9e2cdb4 TG |
330 | cfg |= HPET_TN_ENABLE | HPET_TN_PERIODIC | |
331 | HPET_TN_SETVAL | HPET_TN_32BIT; | |
b40d575b | 332 | hpet_writel(cfg, HPET_Tn_CFG(timer)); |
7a6f9cbb AH |
333 | hpet_writel(cmp, HPET_Tn_CMP(timer)); |
334 | udelay(1); | |
335 | /* | |
336 | * HPET on AMD 81xx needs a second write (with HPET_TN_SETVAL | |
337 | * cleared) to T0_CMP to set the period. The HPET_TN_SETVAL | |
338 | * bit is automatically cleared after the first write. | |
339 | * (See AMD-8111 HyperTransport I/O Hub Data Sheet, | |
340 | * Publication # 24674) | |
341 | */ | |
b40d575b | 342 | hpet_writel((unsigned long) delta, HPET_Tn_CMP(timer)); |
c23e253e | 343 | hpet_start_counter(); |
b98103a5 | 344 | hpet_print_config(); |
e9e2cdb4 TG |
345 | break; |
346 | ||
347 | case CLOCK_EVT_MODE_ONESHOT: | |
b40d575b | 348 | cfg = hpet_readl(HPET_Tn_CFG(timer)); |
e9e2cdb4 TG |
349 | cfg &= ~HPET_TN_PERIODIC; |
350 | cfg |= HPET_TN_ENABLE | HPET_TN_32BIT; | |
b40d575b | 351 | hpet_writel(cfg, HPET_Tn_CFG(timer)); |
e9e2cdb4 TG |
352 | break; |
353 | ||
354 | case CLOCK_EVT_MODE_UNUSED: | |
355 | case CLOCK_EVT_MODE_SHUTDOWN: | |
b40d575b | 356 | cfg = hpet_readl(HPET_Tn_CFG(timer)); |
e9e2cdb4 | 357 | cfg &= ~HPET_TN_ENABLE; |
b40d575b | 358 | hpet_writel(cfg, HPET_Tn_CFG(timer)); |
e9e2cdb4 | 359 | break; |
18de5bc4 TG |
360 | |
361 | case CLOCK_EVT_MODE_RESUME: | |
26afe5f2 | 362 | if (timer == 0) { |
363 | hpet_enable_legacy_int(); | |
364 | } else { | |
365 | struct hpet_dev *hdev = EVT_TO_HPET_DEV(evt); | |
366 | hpet_setup_msi_irq(hdev->irq); | |
367 | disable_irq(hdev->irq); | |
0de26520 | 368 | irq_set_affinity(hdev->irq, cpumask_of(hdev->cpu)); |
26afe5f2 | 369 | enable_irq(hdev->irq); |
370 | } | |
b98103a5 | 371 | hpet_print_config(); |
18de5bc4 | 372 | break; |
e9e2cdb4 TG |
373 | } |
374 | } | |
375 | ||
b40d575b | 376 | static int hpet_next_event(unsigned long delta, |
377 | struct clock_event_device *evt, int timer) | |
e9e2cdb4 | 378 | { |
f7676254 | 379 | u32 cnt; |
e9e2cdb4 TG |
380 | |
381 | cnt = hpet_readl(HPET_COUNTER); | |
f7676254 | 382 | cnt += (u32) delta; |
b40d575b | 383 | hpet_writel(cnt, HPET_Tn_CMP(timer)); |
e9e2cdb4 | 384 | |
72d43d9b TG |
385 | /* |
386 | * We need to read back the CMP register to make sure that | |
387 | * what we wrote hit the chip before we compare it to the | |
388 | * counter. | |
389 | */ | |
89d77a1e | 390 | WARN_ON_ONCE((u32)hpet_readl(HPET_Tn_CMP(timer)) != cnt); |
72d43d9b | 391 | |
f7676254 | 392 | return (s32)((u32)hpet_readl(HPET_COUNTER) - cnt) >= 0 ? -ETIME : 0; |
e9e2cdb4 TG |
393 | } |
394 | ||
b40d575b | 395 | static void hpet_legacy_set_mode(enum clock_event_mode mode, |
396 | struct clock_event_device *evt) | |
397 | { | |
398 | hpet_set_mode(mode, evt, 0); | |
399 | } | |
400 | ||
401 | static int hpet_legacy_next_event(unsigned long delta, | |
402 | struct clock_event_device *evt) | |
403 | { | |
404 | return hpet_next_event(delta, evt, 0); | |
405 | } | |
406 | ||
58ac1e76 | 407 | /* |
408 | * HPET MSI Support | |
409 | */ | |
26afe5f2 | 410 | #ifdef CONFIG_PCI_MSI |
5f79f2f2 VP |
411 | |
412 | static DEFINE_PER_CPU(struct hpet_dev *, cpu_hpet_dev); | |
413 | static struct hpet_dev *hpet_devs; | |
414 | ||
58ac1e76 | 415 | void hpet_msi_unmask(unsigned int irq) |
416 | { | |
417 | struct hpet_dev *hdev = get_irq_data(irq); | |
418 | unsigned long cfg; | |
419 | ||
420 | /* unmask it */ | |
421 | cfg = hpet_readl(HPET_Tn_CFG(hdev->num)); | |
422 | cfg |= HPET_TN_FSB; | |
423 | hpet_writel(cfg, HPET_Tn_CFG(hdev->num)); | |
424 | } | |
425 | ||
426 | void hpet_msi_mask(unsigned int irq) | |
427 | { | |
428 | unsigned long cfg; | |
429 | struct hpet_dev *hdev = get_irq_data(irq); | |
430 | ||
431 | /* mask it */ | |
432 | cfg = hpet_readl(HPET_Tn_CFG(hdev->num)); | |
433 | cfg &= ~HPET_TN_FSB; | |
434 | hpet_writel(cfg, HPET_Tn_CFG(hdev->num)); | |
435 | } | |
436 | ||
437 | void hpet_msi_write(unsigned int irq, struct msi_msg *msg) | |
438 | { | |
439 | struct hpet_dev *hdev = get_irq_data(irq); | |
440 | ||
441 | hpet_writel(msg->data, HPET_Tn_ROUTE(hdev->num)); | |
442 | hpet_writel(msg->address_lo, HPET_Tn_ROUTE(hdev->num) + 4); | |
443 | } | |
444 | ||
445 | void hpet_msi_read(unsigned int irq, struct msi_msg *msg) | |
446 | { | |
447 | struct hpet_dev *hdev = get_irq_data(irq); | |
448 | ||
449 | msg->data = hpet_readl(HPET_Tn_ROUTE(hdev->num)); | |
450 | msg->address_lo = hpet_readl(HPET_Tn_ROUTE(hdev->num) + 4); | |
451 | msg->address_hi = 0; | |
452 | } | |
453 | ||
26afe5f2 | 454 | static void hpet_msi_set_mode(enum clock_event_mode mode, |
455 | struct clock_event_device *evt) | |
456 | { | |
457 | struct hpet_dev *hdev = EVT_TO_HPET_DEV(evt); | |
458 | hpet_set_mode(mode, evt, hdev->num); | |
459 | } | |
460 | ||
461 | static int hpet_msi_next_event(unsigned long delta, | |
462 | struct clock_event_device *evt) | |
463 | { | |
464 | struct hpet_dev *hdev = EVT_TO_HPET_DEV(evt); | |
465 | return hpet_next_event(delta, evt, hdev->num); | |
466 | } | |
467 | ||
468 | static int hpet_setup_msi_irq(unsigned int irq) | |
469 | { | |
470 | if (arch_setup_hpet_msi(irq)) { | |
471 | destroy_irq(irq); | |
472 | return -EINVAL; | |
473 | } | |
474 | return 0; | |
475 | } | |
476 | ||
477 | static int hpet_assign_irq(struct hpet_dev *dev) | |
478 | { | |
479 | unsigned int irq; | |
480 | ||
481 | irq = create_irq(); | |
482 | if (!irq) | |
483 | return -EINVAL; | |
484 | ||
485 | set_irq_data(irq, dev); | |
486 | ||
487 | if (hpet_setup_msi_irq(irq)) | |
488 | return -EINVAL; | |
489 | ||
490 | dev->irq = irq; | |
491 | return 0; | |
492 | } | |
493 | ||
494 | static irqreturn_t hpet_interrupt_handler(int irq, void *data) | |
495 | { | |
496 | struct hpet_dev *dev = (struct hpet_dev *)data; | |
497 | struct clock_event_device *hevt = &dev->evt; | |
498 | ||
499 | if (!hevt->event_handler) { | |
500 | printk(KERN_INFO "Spurious HPET timer interrupt on HPET timer %d\n", | |
501 | dev->num); | |
502 | return IRQ_HANDLED; | |
503 | } | |
504 | ||
505 | hevt->event_handler(hevt); | |
506 | return IRQ_HANDLED; | |
507 | } | |
508 | ||
509 | static int hpet_setup_irq(struct hpet_dev *dev) | |
510 | { | |
511 | ||
512 | if (request_irq(dev->irq, hpet_interrupt_handler, | |
507fa3a3 TG |
513 | IRQF_TIMER | IRQF_DISABLED | IRQF_NOBALANCING, |
514 | dev->name, dev)) | |
26afe5f2 | 515 | return -1; |
516 | ||
517 | disable_irq(dev->irq); | |
0de26520 | 518 | irq_set_affinity(dev->irq, cpumask_of(dev->cpu)); |
26afe5f2 | 519 | enable_irq(dev->irq); |
520 | ||
c81bba49 YL |
521 | printk(KERN_DEBUG "hpet: %s irq %d for MSI\n", |
522 | dev->name, dev->irq); | |
523 | ||
26afe5f2 | 524 | return 0; |
525 | } | |
526 | ||
527 | /* This should be called in specific @cpu */ | |
528 | static void init_one_hpet_msi_clockevent(struct hpet_dev *hdev, int cpu) | |
529 | { | |
530 | struct clock_event_device *evt = &hdev->evt; | |
531 | uint64_t hpet_freq; | |
532 | ||
533 | WARN_ON(cpu != smp_processor_id()); | |
534 | if (!(hdev->flags & HPET_DEV_VALID)) | |
535 | return; | |
536 | ||
537 | if (hpet_setup_msi_irq(hdev->irq)) | |
538 | return; | |
539 | ||
540 | hdev->cpu = cpu; | |
541 | per_cpu(cpu_hpet_dev, cpu) = hdev; | |
542 | evt->name = hdev->name; | |
543 | hpet_setup_irq(hdev); | |
544 | evt->irq = hdev->irq; | |
545 | ||
546 | evt->rating = 110; | |
547 | evt->features = CLOCK_EVT_FEAT_ONESHOT; | |
548 | if (hdev->flags & HPET_DEV_PERI_CAP) | |
549 | evt->features |= CLOCK_EVT_FEAT_PERIODIC; | |
550 | ||
551 | evt->set_mode = hpet_msi_set_mode; | |
552 | evt->set_next_event = hpet_msi_next_event; | |
553 | evt->shift = 32; | |
554 | ||
555 | /* | |
556 | * The period is a femto seconds value. We need to calculate the | |
557 | * scaled math multiplication factor for nanosecond to hpet tick | |
558 | * conversion. | |
559 | */ | |
560 | hpet_freq = 1000000000000000ULL; | |
561 | do_div(hpet_freq, hpet_period); | |
562 | evt->mult = div_sc((unsigned long) hpet_freq, | |
563 | NSEC_PER_SEC, evt->shift); | |
564 | /* Calculate the max delta */ | |
565 | evt->max_delta_ns = clockevent_delta2ns(0x7FFFFFFF, evt); | |
566 | /* 5 usec minimum reprogramming delta. */ | |
567 | evt->min_delta_ns = 5000; | |
568 | ||
320ab2b0 | 569 | evt->cpumask = cpumask_of(hdev->cpu); |
26afe5f2 | 570 | clockevents_register_device(evt); |
571 | } | |
572 | ||
573 | #ifdef CONFIG_HPET | |
574 | /* Reserve at least one timer for userspace (/dev/hpet) */ | |
575 | #define RESERVE_TIMERS 1 | |
576 | #else | |
577 | #define RESERVE_TIMERS 0 | |
578 | #endif | |
5f79f2f2 VP |
579 | |
580 | static void hpet_msi_capability_lookup(unsigned int start_timer) | |
26afe5f2 | 581 | { |
582 | unsigned int id; | |
583 | unsigned int num_timers; | |
584 | unsigned int num_timers_used = 0; | |
585 | int i; | |
586 | ||
39fe05e5 SL |
587 | if (boot_cpu_has(X86_FEATURE_ARAT)) |
588 | return; | |
26afe5f2 | 589 | id = hpet_readl(HPET_ID); |
590 | ||
591 | num_timers = ((id & HPET_ID_NUMBER) >> HPET_ID_NUMBER_SHIFT); | |
592 | num_timers++; /* Value read out starts from 0 */ | |
b98103a5 | 593 | hpet_print_config(); |
26afe5f2 | 594 | |
595 | hpet_devs = kzalloc(sizeof(struct hpet_dev) * num_timers, GFP_KERNEL); | |
596 | if (!hpet_devs) | |
597 | return; | |
598 | ||
599 | hpet_num_timers = num_timers; | |
600 | ||
601 | for (i = start_timer; i < num_timers - RESERVE_TIMERS; i++) { | |
602 | struct hpet_dev *hdev = &hpet_devs[num_timers_used]; | |
603 | unsigned long cfg = hpet_readl(HPET_Tn_CFG(i)); | |
604 | ||
605 | /* Only consider HPET timer with MSI support */ | |
606 | if (!(cfg & HPET_TN_FSB_CAP)) | |
607 | continue; | |
608 | ||
609 | hdev->flags = 0; | |
610 | if (cfg & HPET_TN_PERIODIC_CAP) | |
611 | hdev->flags |= HPET_DEV_PERI_CAP; | |
612 | hdev->num = i; | |
613 | ||
614 | sprintf(hdev->name, "hpet%d", i); | |
615 | if (hpet_assign_irq(hdev)) | |
616 | continue; | |
617 | ||
618 | hdev->flags |= HPET_DEV_FSB_CAP; | |
619 | hdev->flags |= HPET_DEV_VALID; | |
620 | num_timers_used++; | |
621 | if (num_timers_used == num_possible_cpus()) | |
622 | break; | |
623 | } | |
624 | ||
625 | printk(KERN_INFO "HPET: %d timers in total, %d timers will be used for per-cpu timer\n", | |
626 | num_timers, num_timers_used); | |
627 | } | |
628 | ||
5f79f2f2 VP |
629 | #ifdef CONFIG_HPET |
630 | static void hpet_reserve_msi_timers(struct hpet_data *hd) | |
631 | { | |
632 | int i; | |
633 | ||
634 | if (!hpet_devs) | |
635 | return; | |
636 | ||
637 | for (i = 0; i < hpet_num_timers; i++) { | |
638 | struct hpet_dev *hdev = &hpet_devs[i]; | |
639 | ||
640 | if (!(hdev->flags & HPET_DEV_VALID)) | |
641 | continue; | |
642 | ||
643 | hd->hd_irq[hdev->num] = hdev->irq; | |
644 | hpet_reserve_timer(hd, hdev->num); | |
645 | } | |
646 | } | |
647 | #endif | |
648 | ||
26afe5f2 | 649 | static struct hpet_dev *hpet_get_unused_timer(void) |
650 | { | |
651 | int i; | |
652 | ||
653 | if (!hpet_devs) | |
654 | return NULL; | |
655 | ||
656 | for (i = 0; i < hpet_num_timers; i++) { | |
657 | struct hpet_dev *hdev = &hpet_devs[i]; | |
658 | ||
659 | if (!(hdev->flags & HPET_DEV_VALID)) | |
660 | continue; | |
661 | if (test_and_set_bit(HPET_DEV_USED_BIT, | |
662 | (unsigned long *)&hdev->flags)) | |
663 | continue; | |
664 | return hdev; | |
665 | } | |
666 | return NULL; | |
667 | } | |
668 | ||
669 | struct hpet_work_struct { | |
670 | struct delayed_work work; | |
671 | struct completion complete; | |
672 | }; | |
673 | ||
674 | static void hpet_work(struct work_struct *w) | |
675 | { | |
676 | struct hpet_dev *hdev; | |
677 | int cpu = smp_processor_id(); | |
678 | struct hpet_work_struct *hpet_work; | |
679 | ||
680 | hpet_work = container_of(w, struct hpet_work_struct, work.work); | |
681 | ||
682 | hdev = hpet_get_unused_timer(); | |
683 | if (hdev) | |
684 | init_one_hpet_msi_clockevent(hdev, cpu); | |
685 | ||
686 | complete(&hpet_work->complete); | |
687 | } | |
688 | ||
689 | static int hpet_cpuhp_notify(struct notifier_block *n, | |
690 | unsigned long action, void *hcpu) | |
691 | { | |
692 | unsigned long cpu = (unsigned long)hcpu; | |
693 | struct hpet_work_struct work; | |
694 | struct hpet_dev *hdev = per_cpu(cpu_hpet_dev, cpu); | |
695 | ||
696 | switch (action & 0xf) { | |
697 | case CPU_ONLINE: | |
336f6c32 | 698 | INIT_DELAYED_WORK_ON_STACK(&work.work, hpet_work); |
26afe5f2 | 699 | init_completion(&work.complete); |
700 | /* FIXME: add schedule_work_on() */ | |
701 | schedule_delayed_work_on(cpu, &work.work, 0); | |
702 | wait_for_completion(&work.complete); | |
336f6c32 | 703 | destroy_timer_on_stack(&work.work.timer); |
26afe5f2 | 704 | break; |
705 | case CPU_DEAD: | |
706 | if (hdev) { | |
707 | free_irq(hdev->irq, hdev); | |
708 | hdev->flags &= ~HPET_DEV_USED; | |
709 | per_cpu(cpu_hpet_dev, cpu) = NULL; | |
710 | } | |
711 | break; | |
712 | } | |
713 | return NOTIFY_OK; | |
714 | } | |
715 | #else | |
716 | ||
ba374c9b SN |
717 | static int hpet_setup_msi_irq(unsigned int irq) |
718 | { | |
719 | return 0; | |
720 | } | |
5f79f2f2 VP |
721 | static void hpet_msi_capability_lookup(unsigned int start_timer) |
722 | { | |
723 | return; | |
724 | } | |
725 | ||
726 | #ifdef CONFIG_HPET | |
727 | static void hpet_reserve_msi_timers(struct hpet_data *hd) | |
26afe5f2 | 728 | { |
729 | return; | |
730 | } | |
5f79f2f2 | 731 | #endif |
26afe5f2 | 732 | |
733 | static int hpet_cpuhp_notify(struct notifier_block *n, | |
734 | unsigned long action, void *hcpu) | |
735 | { | |
736 | return NOTIFY_OK; | |
737 | } | |
738 | ||
739 | #endif | |
740 | ||
6bb74df4 JS |
741 | /* |
742 | * Clock source related code | |
743 | */ | |
8e19608e | 744 | static cycle_t read_hpet(struct clocksource *cs) |
6bb74df4 JS |
745 | { |
746 | return (cycle_t)hpet_readl(HPET_COUNTER); | |
747 | } | |
748 | ||
28769149 TG |
749 | #ifdef CONFIG_X86_64 |
750 | static cycle_t __vsyscall_fn vread_hpet(void) | |
751 | { | |
752 | return readl((const void __iomem *)fix_to_virt(VSYSCALL_HPET) + 0xf0); | |
753 | } | |
754 | #endif | |
755 | ||
6bb74df4 JS |
756 | static struct clocksource clocksource_hpet = { |
757 | .name = "hpet", | |
758 | .rating = 250, | |
759 | .read = read_hpet, | |
760 | .mask = HPET_MASK, | |
761 | .shift = HPET_SHIFT, | |
762 | .flags = CLOCK_SOURCE_IS_CONTINUOUS, | |
8d6f0c82 | 763 | .resume = hpet_resume_counter, |
28769149 TG |
764 | #ifdef CONFIG_X86_64 |
765 | .vread = vread_hpet, | |
766 | #endif | |
6bb74df4 JS |
767 | }; |
768 | ||
610bf2f1 | 769 | static int hpet_clocksource_register(void) |
e9e2cdb4 | 770 | { |
6fd592da | 771 | u64 start, now; |
075bcd1f | 772 | cycle_t t1; |
e9e2cdb4 | 773 | |
e9e2cdb4 | 774 | /* Start the counter */ |
8d6f0c82 | 775 | hpet_restart_counter(); |
e9e2cdb4 | 776 | |
075bcd1f | 777 | /* Verify whether hpet counter works */ |
8e19608e | 778 | t1 = hpet_readl(HPET_COUNTER); |
075bcd1f TG |
779 | rdtscll(start); |
780 | ||
781 | /* | |
782 | * We don't know the TSC frequency yet, but waiting for | |
783 | * 200000 TSC cycles is safe: | |
784 | * 4 GHz == 50us | |
785 | * 1 GHz == 200us | |
786 | */ | |
787 | do { | |
788 | rep_nop(); | |
789 | rdtscll(now); | |
790 | } while ((now - start) < 200000UL); | |
791 | ||
8e19608e | 792 | if (t1 == hpet_readl(HPET_COUNTER)) { |
075bcd1f TG |
793 | printk(KERN_WARNING |
794 | "HPET counter not counting. HPET disabled\n"); | |
610bf2f1 | 795 | return -ENODEV; |
075bcd1f TG |
796 | } |
797 | ||
6fd592da CM |
798 | /* |
799 | * The definition of mult is (include/linux/clocksource.h) | |
800 | * mult/2^shift = ns/cyc and hpet_period is in units of fsec/cyc | |
801 | * so we first need to convert hpet_period to ns/cyc units: | |
802 | * mult/2^shift = ns/cyc = hpet_period/10^6 | |
803 | * mult = (hpet_period * 2^shift)/10^6 | |
804 | * mult = (hpet_period << shift)/FSEC_PER_NSEC | |
6bb74df4 | 805 | */ |
6fd592da | 806 | clocksource_hpet.mult = div_sc(hpet_period, FSEC_PER_NSEC, HPET_SHIFT); |
6bb74df4 JS |
807 | |
808 | clocksource_register(&clocksource_hpet); | |
809 | ||
610bf2f1 VP |
810 | return 0; |
811 | } | |
812 | ||
b02a7f22 PM |
813 | /** |
814 | * hpet_enable - Try to setup the HPET timer. Returns 1 on success. | |
610bf2f1 VP |
815 | */ |
816 | int __init hpet_enable(void) | |
817 | { | |
818 | unsigned long id; | |
a6825f1c | 819 | int i; |
610bf2f1 VP |
820 | |
821 | if (!is_hpet_capable()) | |
822 | return 0; | |
823 | ||
824 | hpet_set_mapping(); | |
825 | ||
826 | /* | |
827 | * Read the period and check for a sane value: | |
828 | */ | |
829 | hpet_period = hpet_readl(HPET_PERIOD); | |
a6825f1c TG |
830 | |
831 | /* | |
832 | * AMD SB700 based systems with spread spectrum enabled use a | |
833 | * SMM based HPET emulation to provide proper frequency | |
834 | * setting. The SMM code is initialized with the first HPET | |
835 | * register access and takes some time to complete. During | |
836 | * this time the config register reads 0xffffffff. We check | |
837 | * for max. 1000 loops whether the config register reads a non | |
838 | * 0xffffffff value to make sure that HPET is up and running | |
839 | * before we go further. A counting loop is safe, as the HPET | |
840 | * access takes thousands of CPU cycles. On non SB700 based | |
841 | * machines this check is only done once and has no side | |
842 | * effects. | |
843 | */ | |
844 | for (i = 0; hpet_readl(HPET_CFG) == 0xFFFFFFFF; i++) { | |
845 | if (i == 1000) { | |
846 | printk(KERN_WARNING | |
847 | "HPET config register value = 0xFFFFFFFF. " | |
848 | "Disabling HPET\n"); | |
849 | goto out_nohpet; | |
850 | } | |
851 | } | |
852 | ||
610bf2f1 VP |
853 | if (hpet_period < HPET_MIN_PERIOD || hpet_period > HPET_MAX_PERIOD) |
854 | goto out_nohpet; | |
855 | ||
856 | /* | |
857 | * Read the HPET ID register to retrieve the IRQ routing | |
858 | * information and the number of channels | |
859 | */ | |
860 | id = hpet_readl(HPET_ID); | |
b98103a5 | 861 | hpet_print_config(); |
610bf2f1 VP |
862 | |
863 | #ifdef CONFIG_HPET_EMULATE_RTC | |
864 | /* | |
865 | * The legacy routing mode needs at least two channels, tick timer | |
866 | * and the rtc emulation channel. | |
867 | */ | |
868 | if (!(id & HPET_ID_NUMBER)) | |
869 | goto out_nohpet; | |
870 | #endif | |
871 | ||
872 | if (hpet_clocksource_register()) | |
873 | goto out_nohpet; | |
874 | ||
e9e2cdb4 | 875 | if (id & HPET_ID_LEGSUP) { |
610bf2f1 | 876 | hpet_legacy_clockevent_register(); |
e9e2cdb4 TG |
877 | return 1; |
878 | } | |
879 | return 0; | |
5d0cf410 | 880 | |
e9e2cdb4 | 881 | out_nohpet: |
06a24dec | 882 | hpet_clear_mapping(); |
bacbe999 | 883 | hpet_address = 0; |
e9e2cdb4 TG |
884 | return 0; |
885 | } | |
886 | ||
28769149 TG |
887 | /* |
888 | * Needs to be late, as the reserve_timer code calls kalloc ! | |
889 | * | |
890 | * Not a problem on i386 as hpet_enable is called from late_time_init, | |
891 | * but on x86_64 it is necessary ! | |
892 | */ | |
893 | static __init int hpet_late_init(void) | |
894 | { | |
26afe5f2 | 895 | int cpu; |
896 | ||
59c69f2a | 897 | if (boot_hpet_disable) |
28769149 TG |
898 | return -ENODEV; |
899 | ||
59c69f2a VP |
900 | if (!hpet_address) { |
901 | if (!force_hpet_address) | |
902 | return -ENODEV; | |
903 | ||
904 | hpet_address = force_hpet_address; | |
905 | hpet_enable(); | |
59c69f2a VP |
906 | } |
907 | ||
39c04b55 JF |
908 | if (!hpet_virt_address) |
909 | return -ENODEV; | |
910 | ||
39fe05e5 SL |
911 | if (hpet_readl(HPET_ID) & HPET_ID_LEGSUP) |
912 | hpet_msi_capability_lookup(2); | |
913 | else | |
914 | hpet_msi_capability_lookup(0); | |
915 | ||
28769149 | 916 | hpet_reserve_platform_timers(hpet_readl(HPET_ID)); |
b98103a5 | 917 | hpet_print_config(); |
59c69f2a | 918 | |
39fe05e5 SL |
919 | if (boot_cpu_has(X86_FEATURE_ARAT)) |
920 | return 0; | |
921 | ||
26afe5f2 | 922 | for_each_online_cpu(cpu) { |
923 | hpet_cpuhp_notify(NULL, CPU_ONLINE, (void *)(long)cpu); | |
924 | } | |
925 | ||
926 | /* This notifier should be called after workqueue is ready */ | |
927 | hotcpu_notifier(hpet_cpuhp_notify, -20); | |
928 | ||
28769149 TG |
929 | return 0; |
930 | } | |
931 | fs_initcall(hpet_late_init); | |
932 | ||
c86c7fbc OH |
933 | void hpet_disable(void) |
934 | { | |
935 | if (is_hpet_capable()) { | |
936 | unsigned long cfg = hpet_readl(HPET_CFG); | |
937 | ||
938 | if (hpet_legacy_int_enabled) { | |
939 | cfg &= ~HPET_CFG_LEGACY; | |
940 | hpet_legacy_int_enabled = 0; | |
941 | } | |
942 | cfg &= ~HPET_CFG_ENABLE; | |
943 | hpet_writel(cfg, HPET_CFG); | |
944 | } | |
945 | } | |
946 | ||
e9e2cdb4 TG |
947 | #ifdef CONFIG_HPET_EMULATE_RTC |
948 | ||
949 | /* HPET in LegacyReplacement Mode eats up RTC interrupt line. When, HPET | |
950 | * is enabled, we support RTC interrupt functionality in software. | |
951 | * RTC has 3 kinds of interrupts: | |
952 | * 1) Update Interrupt - generate an interrupt, every sec, when RTC clock | |
953 | * is updated | |
954 | * 2) Alarm Interrupt - generate an interrupt at a specific time of day | |
955 | * 3) Periodic Interrupt - generate periodic interrupt, with frequencies | |
956 | * 2Hz-8192Hz (2Hz-64Hz for non-root user) (all freqs in powers of 2) | |
957 | * (1) and (2) above are implemented using polling at a frequency of | |
958 | * 64 Hz. The exact frequency is a tradeoff between accuracy and interrupt | |
959 | * overhead. (DEFAULT_RTC_INT_FREQ) | |
960 | * For (3), we use interrupts at 64Hz or user specified periodic | |
961 | * frequency, whichever is higher. | |
962 | */ | |
963 | #include <linux/mc146818rtc.h> | |
964 | #include <linux/rtc.h> | |
1bdbdaac | 965 | #include <asm/rtc.h> |
e9e2cdb4 TG |
966 | |
967 | #define DEFAULT_RTC_INT_FREQ 64 | |
968 | #define DEFAULT_RTC_SHIFT 6 | |
969 | #define RTC_NUM_INTS 1 | |
970 | ||
971 | static unsigned long hpet_rtc_flags; | |
7e2a31da | 972 | static int hpet_prev_update_sec; |
e9e2cdb4 TG |
973 | static struct rtc_time hpet_alarm_time; |
974 | static unsigned long hpet_pie_count; | |
ff08f76d | 975 | static u32 hpet_t1_cmp; |
e9e2cdb4 TG |
976 | static unsigned long hpet_default_delta; |
977 | static unsigned long hpet_pie_delta; | |
978 | static unsigned long hpet_pie_limit; | |
979 | ||
1bdbdaac BW |
980 | static rtc_irq_handler irq_handler; |
981 | ||
ff08f76d PE |
982 | /* |
983 | * Check that the hpet counter c1 is ahead of the c2 | |
984 | */ | |
985 | static inline int hpet_cnt_ahead(u32 c1, u32 c2) | |
986 | { | |
987 | return (s32)(c2 - c1) < 0; | |
988 | } | |
989 | ||
1bdbdaac BW |
990 | /* |
991 | * Registers a IRQ handler. | |
992 | */ | |
993 | int hpet_register_irq_handler(rtc_irq_handler handler) | |
994 | { | |
995 | if (!is_hpet_enabled()) | |
996 | return -ENODEV; | |
997 | if (irq_handler) | |
998 | return -EBUSY; | |
999 | ||
1000 | irq_handler = handler; | |
1001 | ||
1002 | return 0; | |
1003 | } | |
1004 | EXPORT_SYMBOL_GPL(hpet_register_irq_handler); | |
1005 | ||
1006 | /* | |
1007 | * Deregisters the IRQ handler registered with hpet_register_irq_handler() | |
1008 | * and does cleanup. | |
1009 | */ | |
1010 | void hpet_unregister_irq_handler(rtc_irq_handler handler) | |
1011 | { | |
1012 | if (!is_hpet_enabled()) | |
1013 | return; | |
1014 | ||
1015 | irq_handler = NULL; | |
1016 | hpet_rtc_flags = 0; | |
1017 | } | |
1018 | EXPORT_SYMBOL_GPL(hpet_unregister_irq_handler); | |
1019 | ||
e9e2cdb4 TG |
1020 | /* |
1021 | * Timer 1 for RTC emulation. We use one shot mode, as periodic mode | |
1022 | * is not supported by all HPET implementations for timer 1. | |
1023 | * | |
1024 | * hpet_rtc_timer_init() is called when the rtc is initialized. | |
1025 | */ | |
1026 | int hpet_rtc_timer_init(void) | |
1027 | { | |
1028 | unsigned long cfg, cnt, delta, flags; | |
1029 | ||
1030 | if (!is_hpet_enabled()) | |
1031 | return 0; | |
1032 | ||
1033 | if (!hpet_default_delta) { | |
1034 | uint64_t clc; | |
1035 | ||
1036 | clc = (uint64_t) hpet_clockevent.mult * NSEC_PER_SEC; | |
1037 | clc >>= hpet_clockevent.shift + DEFAULT_RTC_SHIFT; | |
1038 | hpet_default_delta = (unsigned long) clc; | |
1039 | } | |
1040 | ||
1041 | if (!(hpet_rtc_flags & RTC_PIE) || hpet_pie_limit) | |
1042 | delta = hpet_default_delta; | |
1043 | else | |
1044 | delta = hpet_pie_delta; | |
1045 | ||
1046 | local_irq_save(flags); | |
1047 | ||
1048 | cnt = delta + hpet_readl(HPET_COUNTER); | |
1049 | hpet_writel(cnt, HPET_T1_CMP); | |
1050 | hpet_t1_cmp = cnt; | |
1051 | ||
1052 | cfg = hpet_readl(HPET_T1_CFG); | |
1053 | cfg &= ~HPET_TN_PERIODIC; | |
1054 | cfg |= HPET_TN_ENABLE | HPET_TN_32BIT; | |
1055 | hpet_writel(cfg, HPET_T1_CFG); | |
1056 | ||
1057 | local_irq_restore(flags); | |
1058 | ||
1059 | return 1; | |
1060 | } | |
1bdbdaac | 1061 | EXPORT_SYMBOL_GPL(hpet_rtc_timer_init); |
e9e2cdb4 TG |
1062 | |
1063 | /* | |
1064 | * The functions below are called from rtc driver. | |
1065 | * Return 0 if HPET is not being used. | |
1066 | * Otherwise do the necessary changes and return 1. | |
1067 | */ | |
1068 | int hpet_mask_rtc_irq_bit(unsigned long bit_mask) | |
1069 | { | |
1070 | if (!is_hpet_enabled()) | |
1071 | return 0; | |
1072 | ||
1073 | hpet_rtc_flags &= ~bit_mask; | |
1074 | return 1; | |
1075 | } | |
1bdbdaac | 1076 | EXPORT_SYMBOL_GPL(hpet_mask_rtc_irq_bit); |
e9e2cdb4 TG |
1077 | |
1078 | int hpet_set_rtc_irq_bit(unsigned long bit_mask) | |
1079 | { | |
1080 | unsigned long oldbits = hpet_rtc_flags; | |
1081 | ||
1082 | if (!is_hpet_enabled()) | |
1083 | return 0; | |
1084 | ||
1085 | hpet_rtc_flags |= bit_mask; | |
1086 | ||
7e2a31da DB |
1087 | if ((bit_mask & RTC_UIE) && !(oldbits & RTC_UIE)) |
1088 | hpet_prev_update_sec = -1; | |
1089 | ||
e9e2cdb4 TG |
1090 | if (!oldbits) |
1091 | hpet_rtc_timer_init(); | |
1092 | ||
1093 | return 1; | |
1094 | } | |
1bdbdaac | 1095 | EXPORT_SYMBOL_GPL(hpet_set_rtc_irq_bit); |
e9e2cdb4 TG |
1096 | |
1097 | int hpet_set_alarm_time(unsigned char hrs, unsigned char min, | |
1098 | unsigned char sec) | |
1099 | { | |
1100 | if (!is_hpet_enabled()) | |
1101 | return 0; | |
1102 | ||
1103 | hpet_alarm_time.tm_hour = hrs; | |
1104 | hpet_alarm_time.tm_min = min; | |
1105 | hpet_alarm_time.tm_sec = sec; | |
1106 | ||
1107 | return 1; | |
1108 | } | |
1bdbdaac | 1109 | EXPORT_SYMBOL_GPL(hpet_set_alarm_time); |
e9e2cdb4 TG |
1110 | |
1111 | int hpet_set_periodic_freq(unsigned long freq) | |
1112 | { | |
1113 | uint64_t clc; | |
1114 | ||
1115 | if (!is_hpet_enabled()) | |
1116 | return 0; | |
1117 | ||
1118 | if (freq <= DEFAULT_RTC_INT_FREQ) | |
1119 | hpet_pie_limit = DEFAULT_RTC_INT_FREQ / freq; | |
1120 | else { | |
1121 | clc = (uint64_t) hpet_clockevent.mult * NSEC_PER_SEC; | |
1122 | do_div(clc, freq); | |
1123 | clc >>= hpet_clockevent.shift; | |
1124 | hpet_pie_delta = (unsigned long) clc; | |
1125 | } | |
1126 | return 1; | |
1127 | } | |
1bdbdaac | 1128 | EXPORT_SYMBOL_GPL(hpet_set_periodic_freq); |
e9e2cdb4 TG |
1129 | |
1130 | int hpet_rtc_dropped_irq(void) | |
1131 | { | |
1132 | return is_hpet_enabled(); | |
1133 | } | |
1bdbdaac | 1134 | EXPORT_SYMBOL_GPL(hpet_rtc_dropped_irq); |
e9e2cdb4 TG |
1135 | |
1136 | static void hpet_rtc_timer_reinit(void) | |
1137 | { | |
1138 | unsigned long cfg, delta; | |
1139 | int lost_ints = -1; | |
1140 | ||
1141 | if (unlikely(!hpet_rtc_flags)) { | |
1142 | cfg = hpet_readl(HPET_T1_CFG); | |
1143 | cfg &= ~HPET_TN_ENABLE; | |
1144 | hpet_writel(cfg, HPET_T1_CFG); | |
1145 | return; | |
1146 | } | |
1147 | ||
1148 | if (!(hpet_rtc_flags & RTC_PIE) || hpet_pie_limit) | |
1149 | delta = hpet_default_delta; | |
1150 | else | |
1151 | delta = hpet_pie_delta; | |
1152 | ||
1153 | /* | |
1154 | * Increment the comparator value until we are ahead of the | |
1155 | * current count. | |
1156 | */ | |
1157 | do { | |
1158 | hpet_t1_cmp += delta; | |
1159 | hpet_writel(hpet_t1_cmp, HPET_T1_CMP); | |
1160 | lost_ints++; | |
ff08f76d | 1161 | } while (!hpet_cnt_ahead(hpet_t1_cmp, hpet_readl(HPET_COUNTER))); |
e9e2cdb4 TG |
1162 | |
1163 | if (lost_ints) { | |
1164 | if (hpet_rtc_flags & RTC_PIE) | |
1165 | hpet_pie_count += lost_ints; | |
1166 | if (printk_ratelimit()) | |
7e2a31da | 1167 | printk(KERN_WARNING "hpet1: lost %d rtc interrupts\n", |
e9e2cdb4 TG |
1168 | lost_ints); |
1169 | } | |
1170 | } | |
1171 | ||
1172 | irqreturn_t hpet_rtc_interrupt(int irq, void *dev_id) | |
1173 | { | |
1174 | struct rtc_time curr_time; | |
1175 | unsigned long rtc_int_flag = 0; | |
1176 | ||
1177 | hpet_rtc_timer_reinit(); | |
1bdbdaac | 1178 | memset(&curr_time, 0, sizeof(struct rtc_time)); |
e9e2cdb4 TG |
1179 | |
1180 | if (hpet_rtc_flags & (RTC_UIE | RTC_AIE)) | |
1bdbdaac | 1181 | get_rtc_time(&curr_time); |
e9e2cdb4 TG |
1182 | |
1183 | if (hpet_rtc_flags & RTC_UIE && | |
1184 | curr_time.tm_sec != hpet_prev_update_sec) { | |
7e2a31da DB |
1185 | if (hpet_prev_update_sec >= 0) |
1186 | rtc_int_flag = RTC_UF; | |
e9e2cdb4 TG |
1187 | hpet_prev_update_sec = curr_time.tm_sec; |
1188 | } | |
1189 | ||
1190 | if (hpet_rtc_flags & RTC_PIE && | |
1191 | ++hpet_pie_count >= hpet_pie_limit) { | |
1192 | rtc_int_flag |= RTC_PF; | |
1193 | hpet_pie_count = 0; | |
1194 | } | |
1195 | ||
8ee291f8 | 1196 | if (hpet_rtc_flags & RTC_AIE && |
e9e2cdb4 TG |
1197 | (curr_time.tm_sec == hpet_alarm_time.tm_sec) && |
1198 | (curr_time.tm_min == hpet_alarm_time.tm_min) && | |
1199 | (curr_time.tm_hour == hpet_alarm_time.tm_hour)) | |
1200 | rtc_int_flag |= RTC_AF; | |
1201 | ||
1202 | if (rtc_int_flag) { | |
1203 | rtc_int_flag |= (RTC_IRQF | (RTC_NUM_INTS << 8)); | |
1bdbdaac BW |
1204 | if (irq_handler) |
1205 | irq_handler(rtc_int_flag, dev_id); | |
e9e2cdb4 TG |
1206 | } |
1207 | return IRQ_HANDLED; | |
1208 | } | |
1bdbdaac | 1209 | EXPORT_SYMBOL_GPL(hpet_rtc_interrupt); |
e9e2cdb4 | 1210 | #endif |