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Commit | Line | Data |
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5d0cf410 | 1 | #include <linux/clocksource.h> |
e9e2cdb4 | 2 | #include <linux/clockchips.h> |
4588c1f0 | 3 | #include <linux/interrupt.h> |
69c60c88 | 4 | #include <linux/export.h> |
28769149 | 5 | #include <linux/delay.h> |
5d0cf410 | 6 | #include <linux/errno.h> |
334955ef | 7 | #include <linux/i8253.h> |
5a0e3ad6 | 8 | #include <linux/slab.h> |
5d0cf410 JS |
9 | #include <linux/hpet.h> |
10 | #include <linux/init.h> | |
58ac1e76 | 11 | #include <linux/cpu.h> |
4588c1f0 IM |
12 | #include <linux/pm.h> |
13 | #include <linux/io.h> | |
5d0cf410 | 14 | |
cd4d09ec | 15 | #include <asm/cpufeature.h> |
d746d1eb | 16 | #include <asm/irqdomain.h> |
28769149 | 17 | #include <asm/fixmap.h> |
4588c1f0 | 18 | #include <asm/hpet.h> |
16f871bc | 19 | #include <asm/time.h> |
5d0cf410 | 20 | |
4588c1f0 | 21 | #define HPET_MASK CLOCKSOURCE_MASK(32) |
5d0cf410 | 22 | |
b10db7f0 PM |
23 | /* FSEC = 10^-15 |
24 | NSEC = 10^-9 */ | |
4588c1f0 | 25 | #define FSEC_PER_NSEC 1000000L |
5d0cf410 | 26 | |
26afe5f2 | 27 | #define HPET_DEV_USED_BIT 2 |
28 | #define HPET_DEV_USED (1 << HPET_DEV_USED_BIT) | |
29 | #define HPET_DEV_VALID 0x8 | |
30 | #define HPET_DEV_FSB_CAP 0x1000 | |
31 | #define HPET_DEV_PERI_CAP 0x2000 | |
32 | ||
f1c18071 TG |
33 | #define HPET_MIN_CYCLES 128 |
34 | #define HPET_MIN_PROG_DELTA (HPET_MIN_CYCLES + (HPET_MIN_CYCLES >> 1)) | |
35 | ||
e9e2cdb4 TG |
36 | /* |
37 | * HPET address is set in acpi/boot.c, when an ACPI entry exists | |
38 | */ | |
4588c1f0 | 39 | unsigned long hpet_address; |
c8bc6f3c | 40 | u8 hpet_blockid; /* OS timer block num */ |
3d45ac4b | 41 | bool hpet_msi_disable; |
73472a46 | 42 | |
e951e4af | 43 | #ifdef CONFIG_PCI_MSI |
3d45ac4b | 44 | static unsigned int hpet_num_timers; |
e951e4af | 45 | #endif |
4588c1f0 | 46 | static void __iomem *hpet_virt_address; |
e9e2cdb4 | 47 | |
58ac1e76 | 48 | struct hpet_dev { |
4588c1f0 IM |
49 | struct clock_event_device evt; |
50 | unsigned int num; | |
51 | int cpu; | |
52 | unsigned int irq; | |
53 | unsigned int flags; | |
54 | char name[10]; | |
58ac1e76 | 55 | }; |
56 | ||
a3819e3e | 57 | static inline struct hpet_dev *EVT_TO_HPET_DEV(struct clock_event_device *evtdev) |
3f7787b3 FW |
58 | { |
59 | return container_of(evtdev, struct hpet_dev, evt); | |
60 | } | |
61 | ||
5946fa3d | 62 | inline unsigned int hpet_readl(unsigned int a) |
e9e2cdb4 TG |
63 | { |
64 | return readl(hpet_virt_address + a); | |
65 | } | |
66 | ||
5946fa3d | 67 | static inline void hpet_writel(unsigned int d, unsigned int a) |
e9e2cdb4 TG |
68 | { |
69 | writel(d, hpet_virt_address + a); | |
70 | } | |
71 | ||
28769149 | 72 | #ifdef CONFIG_X86_64 |
28769149 | 73 | #include <asm/pgtable.h> |
2387ce57 | 74 | #endif |
28769149 | 75 | |
06a24dec TG |
76 | static inline void hpet_set_mapping(void) |
77 | { | |
78 | hpet_virt_address = ioremap_nocache(hpet_address, HPET_MMAP_SIZE); | |
79 | } | |
80 | ||
81 | static inline void hpet_clear_mapping(void) | |
82 | { | |
83 | iounmap(hpet_virt_address); | |
84 | hpet_virt_address = NULL; | |
85 | } | |
86 | ||
e9e2cdb4 TG |
87 | /* |
88 | * HPET command line enable / disable | |
89 | */ | |
3d45ac4b JB |
90 | bool boot_hpet_disable; |
91 | bool hpet_force_user; | |
92 | static bool hpet_verbose; | |
e9e2cdb4 | 93 | |
4588c1f0 | 94 | static int __init hpet_setup(char *str) |
e9e2cdb4 | 95 | { |
b2d6aba9 JB |
96 | while (str) { |
97 | char *next = strchr(str, ','); | |
98 | ||
99 | if (next) | |
100 | *next++ = 0; | |
e9e2cdb4 | 101 | if (!strncmp("disable", str, 7)) |
3d45ac4b | 102 | boot_hpet_disable = true; |
b17530bd | 103 | if (!strncmp("force", str, 5)) |
3d45ac4b | 104 | hpet_force_user = true; |
b98103a5 | 105 | if (!strncmp("verbose", str, 7)) |
3d45ac4b | 106 | hpet_verbose = true; |
b2d6aba9 | 107 | str = next; |
e9e2cdb4 TG |
108 | } |
109 | return 1; | |
110 | } | |
111 | __setup("hpet=", hpet_setup); | |
112 | ||
28769149 TG |
113 | static int __init disable_hpet(char *str) |
114 | { | |
3d45ac4b | 115 | boot_hpet_disable = true; |
28769149 TG |
116 | return 1; |
117 | } | |
118 | __setup("nohpet", disable_hpet); | |
119 | ||
e9e2cdb4 TG |
120 | static inline int is_hpet_capable(void) |
121 | { | |
4588c1f0 | 122 | return !boot_hpet_disable && hpet_address; |
e9e2cdb4 TG |
123 | } |
124 | ||
125 | /* | |
126 | * HPET timer interrupt enable / disable | |
127 | */ | |
3d45ac4b | 128 | static bool hpet_legacy_int_enabled; |
e9e2cdb4 TG |
129 | |
130 | /** | |
131 | * is_hpet_enabled - check whether the hpet timer interrupt is enabled | |
132 | */ | |
133 | int is_hpet_enabled(void) | |
134 | { | |
135 | return is_hpet_capable() && hpet_legacy_int_enabled; | |
136 | } | |
1bdbdaac | 137 | EXPORT_SYMBOL_GPL(is_hpet_enabled); |
e9e2cdb4 | 138 | |
b98103a5 AH |
139 | static void _hpet_print_config(const char *function, int line) |
140 | { | |
141 | u32 i, timers, l, h; | |
142 | printk(KERN_INFO "hpet: %s(%d):\n", function, line); | |
143 | l = hpet_readl(HPET_ID); | |
144 | h = hpet_readl(HPET_PERIOD); | |
145 | timers = ((l & HPET_ID_NUMBER) >> HPET_ID_NUMBER_SHIFT) + 1; | |
146 | printk(KERN_INFO "hpet: ID: 0x%x, PERIOD: 0x%x\n", l, h); | |
147 | l = hpet_readl(HPET_CFG); | |
148 | h = hpet_readl(HPET_STATUS); | |
149 | printk(KERN_INFO "hpet: CFG: 0x%x, STATUS: 0x%x\n", l, h); | |
150 | l = hpet_readl(HPET_COUNTER); | |
151 | h = hpet_readl(HPET_COUNTER+4); | |
152 | printk(KERN_INFO "hpet: COUNTER_l: 0x%x, COUNTER_h: 0x%x\n", l, h); | |
153 | ||
154 | for (i = 0; i < timers; i++) { | |
155 | l = hpet_readl(HPET_Tn_CFG(i)); | |
156 | h = hpet_readl(HPET_Tn_CFG(i)+4); | |
157 | printk(KERN_INFO "hpet: T%d: CFG_l: 0x%x, CFG_h: 0x%x\n", | |
158 | i, l, h); | |
159 | l = hpet_readl(HPET_Tn_CMP(i)); | |
160 | h = hpet_readl(HPET_Tn_CMP(i)+4); | |
161 | printk(KERN_INFO "hpet: T%d: CMP_l: 0x%x, CMP_h: 0x%x\n", | |
162 | i, l, h); | |
163 | l = hpet_readl(HPET_Tn_ROUTE(i)); | |
164 | h = hpet_readl(HPET_Tn_ROUTE(i)+4); | |
165 | printk(KERN_INFO "hpet: T%d ROUTE_l: 0x%x, ROUTE_h: 0x%x\n", | |
166 | i, l, h); | |
167 | } | |
168 | } | |
169 | ||
170 | #define hpet_print_config() \ | |
171 | do { \ | |
172 | if (hpet_verbose) \ | |
02f1f217 | 173 | _hpet_print_config(__func__, __LINE__); \ |
b98103a5 AH |
174 | } while (0) |
175 | ||
e9e2cdb4 TG |
176 | /* |
177 | * When the hpet driver (/dev/hpet) is enabled, we need to reserve | |
178 | * timer 0 and timer 1 in case of RTC emulation. | |
179 | */ | |
180 | #ifdef CONFIG_HPET | |
f0ed4e69 | 181 | |
5f79f2f2 | 182 | static void hpet_reserve_msi_timers(struct hpet_data *hd); |
f0ed4e69 | 183 | |
5946fa3d | 184 | static void hpet_reserve_platform_timers(unsigned int id) |
e9e2cdb4 TG |
185 | { |
186 | struct hpet __iomem *hpet = hpet_virt_address; | |
37a47db8 BR |
187 | struct hpet_timer __iomem *timer = &hpet->hpet_timers[2]; |
188 | unsigned int nrtimers, i; | |
e9e2cdb4 TG |
189 | struct hpet_data hd; |
190 | ||
191 | nrtimers = ((id & HPET_ID_NUMBER) >> HPET_ID_NUMBER_SHIFT) + 1; | |
192 | ||
4588c1f0 IM |
193 | memset(&hd, 0, sizeof(hd)); |
194 | hd.hd_phys_address = hpet_address; | |
195 | hd.hd_address = hpet; | |
196 | hd.hd_nirqs = nrtimers; | |
e9e2cdb4 TG |
197 | hpet_reserve_timer(&hd, 0); |
198 | ||
199 | #ifdef CONFIG_HPET_EMULATE_RTC | |
200 | hpet_reserve_timer(&hd, 1); | |
201 | #endif | |
5761d64b | 202 | |
64a76f66 DB |
203 | /* |
204 | * NOTE that hd_irq[] reflects IOAPIC input pins (LEGACY_8254 | |
205 | * is wrong for i8259!) not the output IRQ. Many BIOS writers | |
206 | * don't bother configuring *any* comparator interrupts. | |
207 | */ | |
e9e2cdb4 TG |
208 | hd.hd_irq[0] = HPET_LEGACY_8254; |
209 | hd.hd_irq[1] = HPET_LEGACY_RTC; | |
210 | ||
fc3fbc45 | 211 | for (i = 2; i < nrtimers; timer++, i++) { |
4588c1f0 IM |
212 | hd.hd_irq[i] = (readl(&timer->hpet_config) & |
213 | Tn_INT_ROUTE_CNF_MASK) >> Tn_INT_ROUTE_CNF_SHIFT; | |
fc3fbc45 | 214 | } |
5761d64b | 215 | |
f0ed4e69 | 216 | hpet_reserve_msi_timers(&hd); |
26afe5f2 | 217 | |
e9e2cdb4 | 218 | hpet_alloc(&hd); |
5761d64b | 219 | |
e9e2cdb4 TG |
220 | } |
221 | #else | |
5946fa3d | 222 | static void hpet_reserve_platform_timers(unsigned int id) { } |
e9e2cdb4 TG |
223 | #endif |
224 | ||
225 | /* | |
226 | * Common hpet info | |
227 | */ | |
ab0e08f1 | 228 | static unsigned long hpet_freq; |
e9e2cdb4 | 229 | |
c8b5db7d | 230 | static struct clock_event_device hpet_clockevent; |
e9e2cdb4 | 231 | |
8d6f0c82 | 232 | static void hpet_stop_counter(void) |
e9e2cdb4 | 233 | { |
3d45ac4b | 234 | u32 cfg = hpet_readl(HPET_CFG); |
e9e2cdb4 TG |
235 | cfg &= ~HPET_CFG_ENABLE; |
236 | hpet_writel(cfg, HPET_CFG); | |
7a6f9cbb AH |
237 | } |
238 | ||
239 | static void hpet_reset_counter(void) | |
240 | { | |
e9e2cdb4 TG |
241 | hpet_writel(0, HPET_COUNTER); |
242 | hpet_writel(0, HPET_COUNTER + 4); | |
8d6f0c82 AH |
243 | } |
244 | ||
245 | static void hpet_start_counter(void) | |
246 | { | |
5946fa3d | 247 | unsigned int cfg = hpet_readl(HPET_CFG); |
e9e2cdb4 TG |
248 | cfg |= HPET_CFG_ENABLE; |
249 | hpet_writel(cfg, HPET_CFG); | |
250 | } | |
251 | ||
8d6f0c82 AH |
252 | static void hpet_restart_counter(void) |
253 | { | |
254 | hpet_stop_counter(); | |
7a6f9cbb | 255 | hpet_reset_counter(); |
8d6f0c82 AH |
256 | hpet_start_counter(); |
257 | } | |
258 | ||
59c69f2a VP |
259 | static void hpet_resume_device(void) |
260 | { | |
bfe0c1cc | 261 | force_hpet_resume(); |
59c69f2a VP |
262 | } |
263 | ||
17622339 | 264 | static void hpet_resume_counter(struct clocksource *cs) |
59c69f2a VP |
265 | { |
266 | hpet_resume_device(); | |
8d6f0c82 | 267 | hpet_restart_counter(); |
59c69f2a VP |
268 | } |
269 | ||
610bf2f1 | 270 | static void hpet_enable_legacy_int(void) |
e9e2cdb4 | 271 | { |
5946fa3d | 272 | unsigned int cfg = hpet_readl(HPET_CFG); |
e9e2cdb4 TG |
273 | |
274 | cfg |= HPET_CFG_LEGACY; | |
275 | hpet_writel(cfg, HPET_CFG); | |
3d45ac4b | 276 | hpet_legacy_int_enabled = true; |
e9e2cdb4 TG |
277 | } |
278 | ||
610bf2f1 VP |
279 | static void hpet_legacy_clockevent_register(void) |
280 | { | |
610bf2f1 VP |
281 | /* Start HPET legacy interrupts */ |
282 | hpet_enable_legacy_int(); | |
283 | ||
610bf2f1 VP |
284 | /* |
285 | * Start hpet with the boot cpu mask and make it | |
286 | * global after the IO_APIC has been initialized. | |
287 | */ | |
320ab2b0 | 288 | hpet_clockevent.cpumask = cpumask_of(smp_processor_id()); |
ab0e08f1 TG |
289 | clockevents_config_and_register(&hpet_clockevent, hpet_freq, |
290 | HPET_MIN_PROG_DELTA, 0x7FFFFFFF); | |
610bf2f1 VP |
291 | global_clock_event = &hpet_clockevent; |
292 | printk(KERN_DEBUG "hpet clockevent registered\n"); | |
293 | } | |
294 | ||
c8b5db7d | 295 | static int hpet_set_periodic(struct clock_event_device *evt, int timer) |
e9e2cdb4 | 296 | { |
5946fa3d | 297 | unsigned int cfg, cmp, now; |
e9e2cdb4 TG |
298 | uint64_t delta; |
299 | ||
c8b5db7d VK |
300 | hpet_stop_counter(); |
301 | delta = ((uint64_t)(NSEC_PER_SEC / HZ)) * evt->mult; | |
302 | delta >>= evt->shift; | |
303 | now = hpet_readl(HPET_COUNTER); | |
304 | cmp = now + (unsigned int)delta; | |
305 | cfg = hpet_readl(HPET_Tn_CFG(timer)); | |
306 | cfg |= HPET_TN_ENABLE | HPET_TN_PERIODIC | HPET_TN_SETVAL | | |
307 | HPET_TN_32BIT; | |
308 | hpet_writel(cfg, HPET_Tn_CFG(timer)); | |
309 | hpet_writel(cmp, HPET_Tn_CMP(timer)); | |
310 | udelay(1); | |
311 | /* | |
312 | * HPET on AMD 81xx needs a second write (with HPET_TN_SETVAL | |
313 | * cleared) to T0_CMP to set the period. The HPET_TN_SETVAL | |
314 | * bit is automatically cleared after the first write. | |
315 | * (See AMD-8111 HyperTransport I/O Hub Data Sheet, | |
316 | * Publication # 24674) | |
317 | */ | |
318 | hpet_writel((unsigned int)delta, HPET_Tn_CMP(timer)); | |
319 | hpet_start_counter(); | |
320 | hpet_print_config(); | |
321 | ||
322 | return 0; | |
323 | } | |
324 | ||
325 | static int hpet_set_oneshot(struct clock_event_device *evt, int timer) | |
326 | { | |
327 | unsigned int cfg; | |
328 | ||
329 | cfg = hpet_readl(HPET_Tn_CFG(timer)); | |
330 | cfg &= ~HPET_TN_PERIODIC; | |
331 | cfg |= HPET_TN_ENABLE | HPET_TN_32BIT; | |
332 | hpet_writel(cfg, HPET_Tn_CFG(timer)); | |
333 | ||
334 | return 0; | |
335 | } | |
336 | ||
337 | static int hpet_shutdown(struct clock_event_device *evt, int timer) | |
338 | { | |
339 | unsigned int cfg; | |
340 | ||
341 | cfg = hpet_readl(HPET_Tn_CFG(timer)); | |
342 | cfg &= ~HPET_TN_ENABLE; | |
343 | hpet_writel(cfg, HPET_Tn_CFG(timer)); | |
344 | ||
345 | return 0; | |
346 | } | |
347 | ||
348 | static int hpet_resume(struct clock_event_device *evt, int timer) | |
349 | { | |
350 | if (!timer) { | |
351 | hpet_enable_legacy_int(); | |
352 | } else { | |
353 | struct hpet_dev *hdev = EVT_TO_HPET_DEV(evt); | |
354 | ||
355 | irq_domain_activate_irq(irq_get_irq_data(hdev->irq)); | |
356 | disable_irq(hdev->irq); | |
357 | irq_set_affinity(hdev->irq, cpumask_of(hdev->cpu)); | |
358 | enable_irq(hdev->irq); | |
e9e2cdb4 | 359 | } |
c8b5db7d VK |
360 | hpet_print_config(); |
361 | ||
362 | return 0; | |
e9e2cdb4 TG |
363 | } |
364 | ||
b40d575b | 365 | static int hpet_next_event(unsigned long delta, |
366 | struct clock_event_device *evt, int timer) | |
e9e2cdb4 | 367 | { |
f7676254 | 368 | u32 cnt; |
995bd3bb | 369 | s32 res; |
e9e2cdb4 TG |
370 | |
371 | cnt = hpet_readl(HPET_COUNTER); | |
f7676254 | 372 | cnt += (u32) delta; |
b40d575b | 373 | hpet_writel(cnt, HPET_Tn_CMP(timer)); |
e9e2cdb4 | 374 | |
72d43d9b | 375 | /* |
995bd3bb TG |
376 | * HPETs are a complete disaster. The compare register is |
377 | * based on a equal comparison and neither provides a less | |
378 | * than or equal functionality (which would require to take | |
379 | * the wraparound into account) nor a simple count down event | |
380 | * mode. Further the write to the comparator register is | |
381 | * delayed internally up to two HPET clock cycles in certain | |
f1c18071 TG |
382 | * chipsets (ATI, ICH9,10). Some newer AMD chipsets have even |
383 | * longer delays. We worked around that by reading back the | |
384 | * compare register, but that required another workaround for | |
385 | * ICH9,10 chips where the first readout after write can | |
386 | * return the old stale value. We already had a minimum | |
387 | * programming delta of 5us enforced, but a NMI or SMI hitting | |
995bd3bb TG |
388 | * between the counter readout and the comparator write can |
389 | * move us behind that point easily. Now instead of reading | |
390 | * the compare register back several times, we make the ETIME | |
391 | * decision based on the following: Return ETIME if the | |
f1c18071 | 392 | * counter value after the write is less than HPET_MIN_CYCLES |
995bd3bb | 393 | * away from the event or if the counter is already ahead of |
f1c18071 TG |
394 | * the event. The minimum programming delta for the generic |
395 | * clockevents code is set to 1.5 * HPET_MIN_CYCLES. | |
72d43d9b | 396 | */ |
995bd3bb | 397 | res = (s32)(cnt - hpet_readl(HPET_COUNTER)); |
72d43d9b | 398 | |
f1c18071 | 399 | return res < HPET_MIN_CYCLES ? -ETIME : 0; |
e9e2cdb4 TG |
400 | } |
401 | ||
c8b5db7d | 402 | static int hpet_legacy_shutdown(struct clock_event_device *evt) |
b40d575b | 403 | { |
c8b5db7d VK |
404 | return hpet_shutdown(evt, 0); |
405 | } | |
406 | ||
407 | static int hpet_legacy_set_oneshot(struct clock_event_device *evt) | |
408 | { | |
409 | return hpet_set_oneshot(evt, 0); | |
410 | } | |
411 | ||
412 | static int hpet_legacy_set_periodic(struct clock_event_device *evt) | |
413 | { | |
414 | return hpet_set_periodic(evt, 0); | |
415 | } | |
416 | ||
417 | static int hpet_legacy_resume(struct clock_event_device *evt) | |
418 | { | |
419 | return hpet_resume(evt, 0); | |
b40d575b | 420 | } |
421 | ||
422 | static int hpet_legacy_next_event(unsigned long delta, | |
423 | struct clock_event_device *evt) | |
424 | { | |
425 | return hpet_next_event(delta, evt, 0); | |
426 | } | |
427 | ||
c8b5db7d VK |
428 | /* |
429 | * The hpet clock event device | |
430 | */ | |
431 | static struct clock_event_device hpet_clockevent = { | |
432 | .name = "hpet", | |
433 | .features = CLOCK_EVT_FEAT_PERIODIC | | |
434 | CLOCK_EVT_FEAT_ONESHOT, | |
435 | .set_state_periodic = hpet_legacy_set_periodic, | |
436 | .set_state_oneshot = hpet_legacy_set_oneshot, | |
437 | .set_state_shutdown = hpet_legacy_shutdown, | |
438 | .tick_resume = hpet_legacy_resume, | |
439 | .set_next_event = hpet_legacy_next_event, | |
440 | .irq = 0, | |
441 | .rating = 50, | |
442 | }; | |
443 | ||
58ac1e76 | 444 | /* |
445 | * HPET MSI Support | |
446 | */ | |
26afe5f2 | 447 | #ifdef CONFIG_PCI_MSI |
5f79f2f2 VP |
448 | |
449 | static DEFINE_PER_CPU(struct hpet_dev *, cpu_hpet_dev); | |
450 | static struct hpet_dev *hpet_devs; | |
3cb96f0c | 451 | static struct irq_domain *hpet_domain; |
5f79f2f2 | 452 | |
d0fbca8f | 453 | void hpet_msi_unmask(struct irq_data *data) |
58ac1e76 | 454 | { |
ff96b4d0 | 455 | struct hpet_dev *hdev = irq_data_get_irq_handler_data(data); |
5946fa3d | 456 | unsigned int cfg; |
58ac1e76 | 457 | |
458 | /* unmask it */ | |
459 | cfg = hpet_readl(HPET_Tn_CFG(hdev->num)); | |
6acf5a8c | 460 | cfg |= HPET_TN_ENABLE | HPET_TN_FSB; |
58ac1e76 | 461 | hpet_writel(cfg, HPET_Tn_CFG(hdev->num)); |
462 | } | |
463 | ||
d0fbca8f | 464 | void hpet_msi_mask(struct irq_data *data) |
58ac1e76 | 465 | { |
ff96b4d0 | 466 | struct hpet_dev *hdev = irq_data_get_irq_handler_data(data); |
5946fa3d | 467 | unsigned int cfg; |
58ac1e76 | 468 | |
469 | /* mask it */ | |
470 | cfg = hpet_readl(HPET_Tn_CFG(hdev->num)); | |
6acf5a8c | 471 | cfg &= ~(HPET_TN_ENABLE | HPET_TN_FSB); |
58ac1e76 | 472 | hpet_writel(cfg, HPET_Tn_CFG(hdev->num)); |
473 | } | |
474 | ||
d0fbca8f | 475 | void hpet_msi_write(struct hpet_dev *hdev, struct msi_msg *msg) |
58ac1e76 | 476 | { |
58ac1e76 | 477 | hpet_writel(msg->data, HPET_Tn_ROUTE(hdev->num)); |
478 | hpet_writel(msg->address_lo, HPET_Tn_ROUTE(hdev->num) + 4); | |
479 | } | |
480 | ||
d0fbca8f | 481 | void hpet_msi_read(struct hpet_dev *hdev, struct msi_msg *msg) |
58ac1e76 | 482 | { |
58ac1e76 | 483 | msg->data = hpet_readl(HPET_Tn_ROUTE(hdev->num)); |
484 | msg->address_lo = hpet_readl(HPET_Tn_ROUTE(hdev->num) + 4); | |
485 | msg->address_hi = 0; | |
486 | } | |
487 | ||
c8b5db7d | 488 | static int hpet_msi_shutdown(struct clock_event_device *evt) |
26afe5f2 | 489 | { |
490 | struct hpet_dev *hdev = EVT_TO_HPET_DEV(evt); | |
c8b5db7d VK |
491 | |
492 | return hpet_shutdown(evt, hdev->num); | |
493 | } | |
494 | ||
495 | static int hpet_msi_set_oneshot(struct clock_event_device *evt) | |
496 | { | |
497 | struct hpet_dev *hdev = EVT_TO_HPET_DEV(evt); | |
498 | ||
499 | return hpet_set_oneshot(evt, hdev->num); | |
500 | } | |
501 | ||
502 | static int hpet_msi_set_periodic(struct clock_event_device *evt) | |
503 | { | |
504 | struct hpet_dev *hdev = EVT_TO_HPET_DEV(evt); | |
505 | ||
506 | return hpet_set_periodic(evt, hdev->num); | |
507 | } | |
508 | ||
509 | static int hpet_msi_resume(struct clock_event_device *evt) | |
510 | { | |
511 | struct hpet_dev *hdev = EVT_TO_HPET_DEV(evt); | |
512 | ||
513 | return hpet_resume(evt, hdev->num); | |
26afe5f2 | 514 | } |
515 | ||
516 | static int hpet_msi_next_event(unsigned long delta, | |
517 | struct clock_event_device *evt) | |
518 | { | |
519 | struct hpet_dev *hdev = EVT_TO_HPET_DEV(evt); | |
520 | return hpet_next_event(delta, evt, hdev->num); | |
521 | } | |
522 | ||
26afe5f2 | 523 | static irqreturn_t hpet_interrupt_handler(int irq, void *data) |
524 | { | |
525 | struct hpet_dev *dev = (struct hpet_dev *)data; | |
526 | struct clock_event_device *hevt = &dev->evt; | |
527 | ||
528 | if (!hevt->event_handler) { | |
529 | printk(KERN_INFO "Spurious HPET timer interrupt on HPET timer %d\n", | |
530 | dev->num); | |
531 | return IRQ_HANDLED; | |
532 | } | |
533 | ||
534 | hevt->event_handler(hevt); | |
535 | return IRQ_HANDLED; | |
536 | } | |
537 | ||
538 | static int hpet_setup_irq(struct hpet_dev *dev) | |
539 | { | |
540 | ||
541 | if (request_irq(dev->irq, hpet_interrupt_handler, | |
d20d2efb | 542 | IRQF_TIMER | IRQF_NOBALANCING, |
507fa3a3 | 543 | dev->name, dev)) |
26afe5f2 | 544 | return -1; |
545 | ||
546 | disable_irq(dev->irq); | |
0de26520 | 547 | irq_set_affinity(dev->irq, cpumask_of(dev->cpu)); |
26afe5f2 | 548 | enable_irq(dev->irq); |
549 | ||
c81bba49 YL |
550 | printk(KERN_DEBUG "hpet: %s irq %d for MSI\n", |
551 | dev->name, dev->irq); | |
552 | ||
26afe5f2 | 553 | return 0; |
554 | } | |
555 | ||
556 | /* This should be called in specific @cpu */ | |
557 | static void init_one_hpet_msi_clockevent(struct hpet_dev *hdev, int cpu) | |
558 | { | |
559 | struct clock_event_device *evt = &hdev->evt; | |
26afe5f2 | 560 | |
561 | WARN_ON(cpu != smp_processor_id()); | |
562 | if (!(hdev->flags & HPET_DEV_VALID)) | |
563 | return; | |
564 | ||
26afe5f2 | 565 | hdev->cpu = cpu; |
566 | per_cpu(cpu_hpet_dev, cpu) = hdev; | |
567 | evt->name = hdev->name; | |
568 | hpet_setup_irq(hdev); | |
569 | evt->irq = hdev->irq; | |
570 | ||
571 | evt->rating = 110; | |
572 | evt->features = CLOCK_EVT_FEAT_ONESHOT; | |
c8b5db7d | 573 | if (hdev->flags & HPET_DEV_PERI_CAP) { |
26afe5f2 | 574 | evt->features |= CLOCK_EVT_FEAT_PERIODIC; |
c8b5db7d VK |
575 | evt->set_state_periodic = hpet_msi_set_periodic; |
576 | } | |
26afe5f2 | 577 | |
c8b5db7d VK |
578 | evt->set_state_shutdown = hpet_msi_shutdown; |
579 | evt->set_state_oneshot = hpet_msi_set_oneshot; | |
580 | evt->tick_resume = hpet_msi_resume; | |
26afe5f2 | 581 | evt->set_next_event = hpet_msi_next_event; |
320ab2b0 | 582 | evt->cpumask = cpumask_of(hdev->cpu); |
ab0e08f1 TG |
583 | |
584 | clockevents_config_and_register(evt, hpet_freq, HPET_MIN_PROG_DELTA, | |
585 | 0x7FFFFFFF); | |
26afe5f2 | 586 | } |
587 | ||
588 | #ifdef CONFIG_HPET | |
589 | /* Reserve at least one timer for userspace (/dev/hpet) */ | |
590 | #define RESERVE_TIMERS 1 | |
591 | #else | |
592 | #define RESERVE_TIMERS 0 | |
593 | #endif | |
5f79f2f2 VP |
594 | |
595 | static void hpet_msi_capability_lookup(unsigned int start_timer) | |
26afe5f2 | 596 | { |
597 | unsigned int id; | |
598 | unsigned int num_timers; | |
599 | unsigned int num_timers_used = 0; | |
3cb96f0c | 600 | int i, irq; |
26afe5f2 | 601 | |
73472a46 PV |
602 | if (hpet_msi_disable) |
603 | return; | |
604 | ||
39fe05e5 SL |
605 | if (boot_cpu_has(X86_FEATURE_ARAT)) |
606 | return; | |
26afe5f2 | 607 | id = hpet_readl(HPET_ID); |
608 | ||
609 | num_timers = ((id & HPET_ID_NUMBER) >> HPET_ID_NUMBER_SHIFT); | |
610 | num_timers++; /* Value read out starts from 0 */ | |
b98103a5 | 611 | hpet_print_config(); |
26afe5f2 | 612 | |
3cb96f0c JL |
613 | hpet_domain = hpet_create_irq_domain(hpet_blockid); |
614 | if (!hpet_domain) | |
615 | return; | |
616 | ||
26afe5f2 | 617 | hpet_devs = kzalloc(sizeof(struct hpet_dev) * num_timers, GFP_KERNEL); |
618 | if (!hpet_devs) | |
619 | return; | |
620 | ||
621 | hpet_num_timers = num_timers; | |
622 | ||
623 | for (i = start_timer; i < num_timers - RESERVE_TIMERS; i++) { | |
624 | struct hpet_dev *hdev = &hpet_devs[num_timers_used]; | |
5946fa3d | 625 | unsigned int cfg = hpet_readl(HPET_Tn_CFG(i)); |
26afe5f2 | 626 | |
627 | /* Only consider HPET timer with MSI support */ | |
628 | if (!(cfg & HPET_TN_FSB_CAP)) | |
629 | continue; | |
630 | ||
cb17b2a6 TG |
631 | hdev->flags = 0; |
632 | if (cfg & HPET_TN_PERIODIC_CAP) | |
633 | hdev->flags |= HPET_DEV_PERI_CAP; | |
634 | sprintf(hdev->name, "hpet%d", i); | |
635 | hdev->num = i; | |
636 | ||
3cb96f0c | 637 | irq = hpet_assign_irq(hpet_domain, hdev, hdev->num); |
bafac298 | 638 | if (irq <= 0) |
3cb96f0c JL |
639 | continue; |
640 | ||
3cb96f0c | 641 | hdev->irq = irq; |
26afe5f2 | 642 | hdev->flags |= HPET_DEV_FSB_CAP; |
643 | hdev->flags |= HPET_DEV_VALID; | |
644 | num_timers_used++; | |
645 | if (num_timers_used == num_possible_cpus()) | |
646 | break; | |
647 | } | |
648 | ||
649 | printk(KERN_INFO "HPET: %d timers in total, %d timers will be used for per-cpu timer\n", | |
650 | num_timers, num_timers_used); | |
651 | } | |
652 | ||
5f79f2f2 VP |
653 | #ifdef CONFIG_HPET |
654 | static void hpet_reserve_msi_timers(struct hpet_data *hd) | |
655 | { | |
656 | int i; | |
657 | ||
658 | if (!hpet_devs) | |
659 | return; | |
660 | ||
661 | for (i = 0; i < hpet_num_timers; i++) { | |
662 | struct hpet_dev *hdev = &hpet_devs[i]; | |
663 | ||
664 | if (!(hdev->flags & HPET_DEV_VALID)) | |
665 | continue; | |
666 | ||
667 | hd->hd_irq[hdev->num] = hdev->irq; | |
668 | hpet_reserve_timer(hd, hdev->num); | |
669 | } | |
670 | } | |
671 | #endif | |
672 | ||
26afe5f2 | 673 | static struct hpet_dev *hpet_get_unused_timer(void) |
674 | { | |
675 | int i; | |
676 | ||
677 | if (!hpet_devs) | |
678 | return NULL; | |
679 | ||
680 | for (i = 0; i < hpet_num_timers; i++) { | |
681 | struct hpet_dev *hdev = &hpet_devs[i]; | |
682 | ||
683 | if (!(hdev->flags & HPET_DEV_VALID)) | |
684 | continue; | |
685 | if (test_and_set_bit(HPET_DEV_USED_BIT, | |
686 | (unsigned long *)&hdev->flags)) | |
687 | continue; | |
688 | return hdev; | |
689 | } | |
690 | return NULL; | |
691 | } | |
692 | ||
693 | struct hpet_work_struct { | |
694 | struct delayed_work work; | |
695 | struct completion complete; | |
696 | }; | |
697 | ||
698 | static void hpet_work(struct work_struct *w) | |
699 | { | |
700 | struct hpet_dev *hdev; | |
701 | int cpu = smp_processor_id(); | |
702 | struct hpet_work_struct *hpet_work; | |
703 | ||
704 | hpet_work = container_of(w, struct hpet_work_struct, work.work); | |
705 | ||
706 | hdev = hpet_get_unused_timer(); | |
707 | if (hdev) | |
708 | init_one_hpet_msi_clockevent(hdev, cpu); | |
709 | ||
710 | complete(&hpet_work->complete); | |
711 | } | |
712 | ||
48d7f6c7 | 713 | static int hpet_cpuhp_online(unsigned int cpu) |
26afe5f2 | 714 | { |
26afe5f2 | 715 | struct hpet_work_struct work; |
48d7f6c7 SAS |
716 | |
717 | INIT_DELAYED_WORK_ONSTACK(&work.work, hpet_work); | |
718 | init_completion(&work.complete); | |
719 | /* FIXME: add schedule_work_on() */ | |
720 | schedule_delayed_work_on(cpu, &work.work, 0); | |
721 | wait_for_completion(&work.complete); | |
722 | destroy_delayed_work_on_stack(&work.work); | |
723 | return 0; | |
724 | } | |
725 | ||
726 | static int hpet_cpuhp_dead(unsigned int cpu) | |
727 | { | |
26afe5f2 | 728 | struct hpet_dev *hdev = per_cpu(cpu_hpet_dev, cpu); |
729 | ||
48d7f6c7 SAS |
730 | if (!hdev) |
731 | return 0; | |
732 | free_irq(hdev->irq, hdev); | |
733 | hdev->flags &= ~HPET_DEV_USED; | |
734 | per_cpu(cpu_hpet_dev, cpu) = NULL; | |
735 | return 0; | |
26afe5f2 | 736 | } |
737 | #else | |
738 | ||
5f79f2f2 VP |
739 | static void hpet_msi_capability_lookup(unsigned int start_timer) |
740 | { | |
741 | return; | |
742 | } | |
743 | ||
744 | #ifdef CONFIG_HPET | |
745 | static void hpet_reserve_msi_timers(struct hpet_data *hd) | |
26afe5f2 | 746 | { |
747 | return; | |
748 | } | |
5f79f2f2 | 749 | #endif |
26afe5f2 | 750 | |
48d7f6c7 SAS |
751 | #define hpet_cpuhp_online NULL |
752 | #define hpet_cpuhp_dead NULL | |
26afe5f2 | 753 | |
754 | #endif | |
755 | ||
6bb74df4 JS |
756 | /* |
757 | * Clock source related code | |
758 | */ | |
8e19608e | 759 | static cycle_t read_hpet(struct clocksource *cs) |
6bb74df4 JS |
760 | { |
761 | return (cycle_t)hpet_readl(HPET_COUNTER); | |
762 | } | |
763 | ||
764 | static struct clocksource clocksource_hpet = { | |
765 | .name = "hpet", | |
766 | .rating = 250, | |
767 | .read = read_hpet, | |
768 | .mask = HPET_MASK, | |
6bb74df4 | 769 | .flags = CLOCK_SOURCE_IS_CONTINUOUS, |
8d6f0c82 | 770 | .resume = hpet_resume_counter, |
6bb74df4 JS |
771 | }; |
772 | ||
610bf2f1 | 773 | static int hpet_clocksource_register(void) |
e9e2cdb4 | 774 | { |
6fd592da | 775 | u64 start, now; |
075bcd1f | 776 | cycle_t t1; |
e9e2cdb4 | 777 | |
e9e2cdb4 | 778 | /* Start the counter */ |
8d6f0c82 | 779 | hpet_restart_counter(); |
e9e2cdb4 | 780 | |
075bcd1f | 781 | /* Verify whether hpet counter works */ |
8e19608e | 782 | t1 = hpet_readl(HPET_COUNTER); |
4ea1636b | 783 | start = rdtsc(); |
075bcd1f TG |
784 | |
785 | /* | |
786 | * We don't know the TSC frequency yet, but waiting for | |
787 | * 200000 TSC cycles is safe: | |
788 | * 4 GHz == 50us | |
789 | * 1 GHz == 200us | |
790 | */ | |
791 | do { | |
792 | rep_nop(); | |
4ea1636b | 793 | now = rdtsc(); |
075bcd1f TG |
794 | } while ((now - start) < 200000UL); |
795 | ||
8e19608e | 796 | if (t1 == hpet_readl(HPET_COUNTER)) { |
075bcd1f TG |
797 | printk(KERN_WARNING |
798 | "HPET counter not counting. HPET disabled\n"); | |
610bf2f1 | 799 | return -ENODEV; |
075bcd1f TG |
800 | } |
801 | ||
f12a15be | 802 | clocksource_register_hz(&clocksource_hpet, (u32)hpet_freq); |
610bf2f1 VP |
803 | return 0; |
804 | } | |
805 | ||
396e2c6f JB |
806 | static u32 *hpet_boot_cfg; |
807 | ||
b02a7f22 PM |
808 | /** |
809 | * hpet_enable - Try to setup the HPET timer. Returns 1 on success. | |
610bf2f1 VP |
810 | */ |
811 | int __init hpet_enable(void) | |
812 | { | |
396e2c6f | 813 | u32 hpet_period, cfg, id; |
ab0e08f1 | 814 | u64 freq; |
396e2c6f | 815 | unsigned int i, last; |
610bf2f1 VP |
816 | |
817 | if (!is_hpet_capable()) | |
818 | return 0; | |
819 | ||
820 | hpet_set_mapping(); | |
821 | ||
822 | /* | |
823 | * Read the period and check for a sane value: | |
824 | */ | |
825 | hpet_period = hpet_readl(HPET_PERIOD); | |
a6825f1c TG |
826 | |
827 | /* | |
828 | * AMD SB700 based systems with spread spectrum enabled use a | |
829 | * SMM based HPET emulation to provide proper frequency | |
830 | * setting. The SMM code is initialized with the first HPET | |
831 | * register access and takes some time to complete. During | |
832 | * this time the config register reads 0xffffffff. We check | |
833 | * for max. 1000 loops whether the config register reads a non | |
834 | * 0xffffffff value to make sure that HPET is up and running | |
835 | * before we go further. A counting loop is safe, as the HPET | |
836 | * access takes thousands of CPU cycles. On non SB700 based | |
837 | * machines this check is only done once and has no side | |
838 | * effects. | |
839 | */ | |
840 | for (i = 0; hpet_readl(HPET_CFG) == 0xFFFFFFFF; i++) { | |
841 | if (i == 1000) { | |
842 | printk(KERN_WARNING | |
843 | "HPET config register value = 0xFFFFFFFF. " | |
844 | "Disabling HPET\n"); | |
845 | goto out_nohpet; | |
846 | } | |
847 | } | |
848 | ||
610bf2f1 VP |
849 | if (hpet_period < HPET_MIN_PERIOD || hpet_period > HPET_MAX_PERIOD) |
850 | goto out_nohpet; | |
851 | ||
ab0e08f1 TG |
852 | /* |
853 | * The period is a femto seconds value. Convert it to a | |
854 | * frequency. | |
855 | */ | |
856 | freq = FSEC_PER_SEC; | |
857 | do_div(freq, hpet_period); | |
858 | hpet_freq = freq; | |
859 | ||
610bf2f1 VP |
860 | /* |
861 | * Read the HPET ID register to retrieve the IRQ routing | |
862 | * information and the number of channels | |
863 | */ | |
864 | id = hpet_readl(HPET_ID); | |
b98103a5 | 865 | hpet_print_config(); |
610bf2f1 | 866 | |
396e2c6f JB |
867 | last = (id & HPET_ID_NUMBER) >> HPET_ID_NUMBER_SHIFT; |
868 | ||
610bf2f1 VP |
869 | #ifdef CONFIG_HPET_EMULATE_RTC |
870 | /* | |
871 | * The legacy routing mode needs at least two channels, tick timer | |
872 | * and the rtc emulation channel. | |
873 | */ | |
396e2c6f | 874 | if (!last) |
610bf2f1 VP |
875 | goto out_nohpet; |
876 | #endif | |
877 | ||
396e2c6f JB |
878 | cfg = hpet_readl(HPET_CFG); |
879 | hpet_boot_cfg = kmalloc((last + 2) * sizeof(*hpet_boot_cfg), | |
880 | GFP_KERNEL); | |
881 | if (hpet_boot_cfg) | |
882 | *hpet_boot_cfg = cfg; | |
883 | else | |
884 | pr_warn("HPET initial state will not be saved\n"); | |
885 | cfg &= ~(HPET_CFG_ENABLE | HPET_CFG_LEGACY); | |
1b38a3a1 | 886 | hpet_writel(cfg, HPET_CFG); |
396e2c6f JB |
887 | if (cfg) |
888 | pr_warn("HPET: Unrecognized bits %#x set in global cfg\n", | |
889 | cfg); | |
890 | ||
891 | for (i = 0; i <= last; ++i) { | |
892 | cfg = hpet_readl(HPET_Tn_CFG(i)); | |
893 | if (hpet_boot_cfg) | |
894 | hpet_boot_cfg[i + 1] = cfg; | |
895 | cfg &= ~(HPET_TN_ENABLE | HPET_TN_LEVEL | HPET_TN_FSB); | |
896 | hpet_writel(cfg, HPET_Tn_CFG(i)); | |
897 | cfg &= ~(HPET_TN_PERIODIC | HPET_TN_PERIODIC_CAP | |
898 | | HPET_TN_64BIT_CAP | HPET_TN_32BIT | HPET_TN_ROUTE | |
899 | | HPET_TN_FSB | HPET_TN_FSB_CAP); | |
900 | if (cfg) | |
901 | pr_warn("HPET: Unrecognized bits %#x set in cfg#%u\n", | |
902 | cfg, i); | |
903 | } | |
904 | hpet_print_config(); | |
905 | ||
610bf2f1 VP |
906 | if (hpet_clocksource_register()) |
907 | goto out_nohpet; | |
908 | ||
e9e2cdb4 | 909 | if (id & HPET_ID_LEGSUP) { |
610bf2f1 | 910 | hpet_legacy_clockevent_register(); |
e9e2cdb4 TG |
911 | return 1; |
912 | } | |
913 | return 0; | |
5d0cf410 | 914 | |
e9e2cdb4 | 915 | out_nohpet: |
06a24dec | 916 | hpet_clear_mapping(); |
bacbe999 | 917 | hpet_address = 0; |
e9e2cdb4 TG |
918 | return 0; |
919 | } | |
920 | ||
28769149 TG |
921 | /* |
922 | * Needs to be late, as the reserve_timer code calls kalloc ! | |
923 | * | |
924 | * Not a problem on i386 as hpet_enable is called from late_time_init, | |
925 | * but on x86_64 it is necessary ! | |
926 | */ | |
927 | static __init int hpet_late_init(void) | |
928 | { | |
48d7f6c7 | 929 | int ret; |
26afe5f2 | 930 | |
59c69f2a | 931 | if (boot_hpet_disable) |
28769149 TG |
932 | return -ENODEV; |
933 | ||
59c69f2a VP |
934 | if (!hpet_address) { |
935 | if (!force_hpet_address) | |
936 | return -ENODEV; | |
937 | ||
938 | hpet_address = force_hpet_address; | |
939 | hpet_enable(); | |
59c69f2a VP |
940 | } |
941 | ||
39c04b55 JF |
942 | if (!hpet_virt_address) |
943 | return -ENODEV; | |
944 | ||
39fe05e5 SL |
945 | if (hpet_readl(HPET_ID) & HPET_ID_LEGSUP) |
946 | hpet_msi_capability_lookup(2); | |
947 | else | |
948 | hpet_msi_capability_lookup(0); | |
949 | ||
28769149 | 950 | hpet_reserve_platform_timers(hpet_readl(HPET_ID)); |
b98103a5 | 951 | hpet_print_config(); |
59c69f2a | 952 | |
73472a46 PV |
953 | if (hpet_msi_disable) |
954 | return 0; | |
955 | ||
39fe05e5 SL |
956 | if (boot_cpu_has(X86_FEATURE_ARAT)) |
957 | return 0; | |
958 | ||
26afe5f2 | 959 | /* This notifier should be called after workqueue is ready */ |
48d7f6c7 SAS |
960 | ret = cpuhp_setup_state(CPUHP_AP_X86_HPET_ONLINE, "AP_X86_HPET_ONLINE", |
961 | hpet_cpuhp_online, NULL); | |
962 | if (ret) | |
963 | return ret; | |
964 | ret = cpuhp_setup_state(CPUHP_X86_HPET_DEAD, "X86_HPET_DEAD", NULL, | |
965 | hpet_cpuhp_dead); | |
966 | if (ret) | |
967 | goto err_cpuhp; | |
28769149 | 968 | return 0; |
48d7f6c7 SAS |
969 | |
970 | err_cpuhp: | |
971 | cpuhp_remove_state(CPUHP_AP_X86_HPET_ONLINE); | |
972 | return ret; | |
28769149 TG |
973 | } |
974 | fs_initcall(hpet_late_init); | |
975 | ||
c86c7fbc OH |
976 | void hpet_disable(void) |
977 | { | |
ff487808 | 978 | if (is_hpet_capable() && hpet_virt_address) { |
396e2c6f | 979 | unsigned int cfg = hpet_readl(HPET_CFG), id, last; |
c86c7fbc | 980 | |
396e2c6f JB |
981 | if (hpet_boot_cfg) |
982 | cfg = *hpet_boot_cfg; | |
983 | else if (hpet_legacy_int_enabled) { | |
c86c7fbc | 984 | cfg &= ~HPET_CFG_LEGACY; |
3d45ac4b | 985 | hpet_legacy_int_enabled = false; |
c86c7fbc OH |
986 | } |
987 | cfg &= ~HPET_CFG_ENABLE; | |
988 | hpet_writel(cfg, HPET_CFG); | |
396e2c6f JB |
989 | |
990 | if (!hpet_boot_cfg) | |
991 | return; | |
992 | ||
993 | id = hpet_readl(HPET_ID); | |
994 | last = ((id & HPET_ID_NUMBER) >> HPET_ID_NUMBER_SHIFT); | |
995 | ||
996 | for (id = 0; id <= last; ++id) | |
997 | hpet_writel(hpet_boot_cfg[id + 1], HPET_Tn_CFG(id)); | |
998 | ||
999 | if (*hpet_boot_cfg & HPET_CFG_ENABLE) | |
1000 | hpet_writel(*hpet_boot_cfg, HPET_CFG); | |
c86c7fbc OH |
1001 | } |
1002 | } | |
1003 | ||
e9e2cdb4 TG |
1004 | #ifdef CONFIG_HPET_EMULATE_RTC |
1005 | ||
1006 | /* HPET in LegacyReplacement Mode eats up RTC interrupt line. When, HPET | |
1007 | * is enabled, we support RTC interrupt functionality in software. | |
1008 | * RTC has 3 kinds of interrupts: | |
1009 | * 1) Update Interrupt - generate an interrupt, every sec, when RTC clock | |
1010 | * is updated | |
1011 | * 2) Alarm Interrupt - generate an interrupt at a specific time of day | |
1012 | * 3) Periodic Interrupt - generate periodic interrupt, with frequencies | |
1013 | * 2Hz-8192Hz (2Hz-64Hz for non-root user) (all freqs in powers of 2) | |
1014 | * (1) and (2) above are implemented using polling at a frequency of | |
1015 | * 64 Hz. The exact frequency is a tradeoff between accuracy and interrupt | |
1016 | * overhead. (DEFAULT_RTC_INT_FREQ) | |
1017 | * For (3), we use interrupts at 64Hz or user specified periodic | |
1018 | * frequency, whichever is higher. | |
1019 | */ | |
1020 | #include <linux/mc146818rtc.h> | |
1021 | #include <linux/rtc.h> | |
1bdbdaac | 1022 | #include <asm/rtc.h> |
e9e2cdb4 TG |
1023 | |
1024 | #define DEFAULT_RTC_INT_FREQ 64 | |
1025 | #define DEFAULT_RTC_SHIFT 6 | |
1026 | #define RTC_NUM_INTS 1 | |
1027 | ||
1028 | static unsigned long hpet_rtc_flags; | |
7e2a31da | 1029 | static int hpet_prev_update_sec; |
e9e2cdb4 TG |
1030 | static struct rtc_time hpet_alarm_time; |
1031 | static unsigned long hpet_pie_count; | |
ff08f76d | 1032 | static u32 hpet_t1_cmp; |
5946fa3d JB |
1033 | static u32 hpet_default_delta; |
1034 | static u32 hpet_pie_delta; | |
e9e2cdb4 TG |
1035 | static unsigned long hpet_pie_limit; |
1036 | ||
1bdbdaac BW |
1037 | static rtc_irq_handler irq_handler; |
1038 | ||
ff08f76d PE |
1039 | /* |
1040 | * Check that the hpet counter c1 is ahead of the c2 | |
1041 | */ | |
1042 | static inline int hpet_cnt_ahead(u32 c1, u32 c2) | |
1043 | { | |
1044 | return (s32)(c2 - c1) < 0; | |
1045 | } | |
1046 | ||
1bdbdaac BW |
1047 | /* |
1048 | * Registers a IRQ handler. | |
1049 | */ | |
1050 | int hpet_register_irq_handler(rtc_irq_handler handler) | |
1051 | { | |
1052 | if (!is_hpet_enabled()) | |
1053 | return -ENODEV; | |
1054 | if (irq_handler) | |
1055 | return -EBUSY; | |
1056 | ||
1057 | irq_handler = handler; | |
1058 | ||
1059 | return 0; | |
1060 | } | |
1061 | EXPORT_SYMBOL_GPL(hpet_register_irq_handler); | |
1062 | ||
1063 | /* | |
1064 | * Deregisters the IRQ handler registered with hpet_register_irq_handler() | |
1065 | * and does cleanup. | |
1066 | */ | |
1067 | void hpet_unregister_irq_handler(rtc_irq_handler handler) | |
1068 | { | |
1069 | if (!is_hpet_enabled()) | |
1070 | return; | |
1071 | ||
1072 | irq_handler = NULL; | |
1073 | hpet_rtc_flags = 0; | |
1074 | } | |
1075 | EXPORT_SYMBOL_GPL(hpet_unregister_irq_handler); | |
1076 | ||
e9e2cdb4 TG |
1077 | /* |
1078 | * Timer 1 for RTC emulation. We use one shot mode, as periodic mode | |
1079 | * is not supported by all HPET implementations for timer 1. | |
1080 | * | |
1081 | * hpet_rtc_timer_init() is called when the rtc is initialized. | |
1082 | */ | |
1083 | int hpet_rtc_timer_init(void) | |
1084 | { | |
5946fa3d JB |
1085 | unsigned int cfg, cnt, delta; |
1086 | unsigned long flags; | |
e9e2cdb4 TG |
1087 | |
1088 | if (!is_hpet_enabled()) | |
1089 | return 0; | |
1090 | ||
1091 | if (!hpet_default_delta) { | |
1092 | uint64_t clc; | |
1093 | ||
1094 | clc = (uint64_t) hpet_clockevent.mult * NSEC_PER_SEC; | |
1095 | clc >>= hpet_clockevent.shift + DEFAULT_RTC_SHIFT; | |
5946fa3d | 1096 | hpet_default_delta = clc; |
e9e2cdb4 TG |
1097 | } |
1098 | ||
1099 | if (!(hpet_rtc_flags & RTC_PIE) || hpet_pie_limit) | |
1100 | delta = hpet_default_delta; | |
1101 | else | |
1102 | delta = hpet_pie_delta; | |
1103 | ||
1104 | local_irq_save(flags); | |
1105 | ||
1106 | cnt = delta + hpet_readl(HPET_COUNTER); | |
1107 | hpet_writel(cnt, HPET_T1_CMP); | |
1108 | hpet_t1_cmp = cnt; | |
1109 | ||
1110 | cfg = hpet_readl(HPET_T1_CFG); | |
1111 | cfg &= ~HPET_TN_PERIODIC; | |
1112 | cfg |= HPET_TN_ENABLE | HPET_TN_32BIT; | |
1113 | hpet_writel(cfg, HPET_T1_CFG); | |
1114 | ||
1115 | local_irq_restore(flags); | |
1116 | ||
1117 | return 1; | |
1118 | } | |
1bdbdaac | 1119 | EXPORT_SYMBOL_GPL(hpet_rtc_timer_init); |
e9e2cdb4 | 1120 | |
2ded6e6a ML |
1121 | static void hpet_disable_rtc_channel(void) |
1122 | { | |
3d45ac4b | 1123 | u32 cfg = hpet_readl(HPET_T1_CFG); |
2ded6e6a ML |
1124 | cfg &= ~HPET_TN_ENABLE; |
1125 | hpet_writel(cfg, HPET_T1_CFG); | |
1126 | } | |
1127 | ||
e9e2cdb4 TG |
1128 | /* |
1129 | * The functions below are called from rtc driver. | |
1130 | * Return 0 if HPET is not being used. | |
1131 | * Otherwise do the necessary changes and return 1. | |
1132 | */ | |
1133 | int hpet_mask_rtc_irq_bit(unsigned long bit_mask) | |
1134 | { | |
1135 | if (!is_hpet_enabled()) | |
1136 | return 0; | |
1137 | ||
1138 | hpet_rtc_flags &= ~bit_mask; | |
2ded6e6a ML |
1139 | if (unlikely(!hpet_rtc_flags)) |
1140 | hpet_disable_rtc_channel(); | |
1141 | ||
e9e2cdb4 TG |
1142 | return 1; |
1143 | } | |
1bdbdaac | 1144 | EXPORT_SYMBOL_GPL(hpet_mask_rtc_irq_bit); |
e9e2cdb4 TG |
1145 | |
1146 | int hpet_set_rtc_irq_bit(unsigned long bit_mask) | |
1147 | { | |
1148 | unsigned long oldbits = hpet_rtc_flags; | |
1149 | ||
1150 | if (!is_hpet_enabled()) | |
1151 | return 0; | |
1152 | ||
1153 | hpet_rtc_flags |= bit_mask; | |
1154 | ||
7e2a31da DB |
1155 | if ((bit_mask & RTC_UIE) && !(oldbits & RTC_UIE)) |
1156 | hpet_prev_update_sec = -1; | |
1157 | ||
e9e2cdb4 TG |
1158 | if (!oldbits) |
1159 | hpet_rtc_timer_init(); | |
1160 | ||
1161 | return 1; | |
1162 | } | |
1bdbdaac | 1163 | EXPORT_SYMBOL_GPL(hpet_set_rtc_irq_bit); |
e9e2cdb4 TG |
1164 | |
1165 | int hpet_set_alarm_time(unsigned char hrs, unsigned char min, | |
1166 | unsigned char sec) | |
1167 | { | |
1168 | if (!is_hpet_enabled()) | |
1169 | return 0; | |
1170 | ||
1171 | hpet_alarm_time.tm_hour = hrs; | |
1172 | hpet_alarm_time.tm_min = min; | |
1173 | hpet_alarm_time.tm_sec = sec; | |
1174 | ||
1175 | return 1; | |
1176 | } | |
1bdbdaac | 1177 | EXPORT_SYMBOL_GPL(hpet_set_alarm_time); |
e9e2cdb4 TG |
1178 | |
1179 | int hpet_set_periodic_freq(unsigned long freq) | |
1180 | { | |
1181 | uint64_t clc; | |
1182 | ||
1183 | if (!is_hpet_enabled()) | |
1184 | return 0; | |
1185 | ||
1186 | if (freq <= DEFAULT_RTC_INT_FREQ) | |
1187 | hpet_pie_limit = DEFAULT_RTC_INT_FREQ / freq; | |
1188 | else { | |
1189 | clc = (uint64_t) hpet_clockevent.mult * NSEC_PER_SEC; | |
1190 | do_div(clc, freq); | |
1191 | clc >>= hpet_clockevent.shift; | |
5946fa3d | 1192 | hpet_pie_delta = clc; |
b4a5e8a1 | 1193 | hpet_pie_limit = 0; |
e9e2cdb4 TG |
1194 | } |
1195 | return 1; | |
1196 | } | |
1bdbdaac | 1197 | EXPORT_SYMBOL_GPL(hpet_set_periodic_freq); |
e9e2cdb4 TG |
1198 | |
1199 | int hpet_rtc_dropped_irq(void) | |
1200 | { | |
1201 | return is_hpet_enabled(); | |
1202 | } | |
1bdbdaac | 1203 | EXPORT_SYMBOL_GPL(hpet_rtc_dropped_irq); |
e9e2cdb4 TG |
1204 | |
1205 | static void hpet_rtc_timer_reinit(void) | |
1206 | { | |
2ded6e6a | 1207 | unsigned int delta; |
e9e2cdb4 TG |
1208 | int lost_ints = -1; |
1209 | ||
2ded6e6a ML |
1210 | if (unlikely(!hpet_rtc_flags)) |
1211 | hpet_disable_rtc_channel(); | |
e9e2cdb4 TG |
1212 | |
1213 | if (!(hpet_rtc_flags & RTC_PIE) || hpet_pie_limit) | |
1214 | delta = hpet_default_delta; | |
1215 | else | |
1216 | delta = hpet_pie_delta; | |
1217 | ||
1218 | /* | |
1219 | * Increment the comparator value until we are ahead of the | |
1220 | * current count. | |
1221 | */ | |
1222 | do { | |
1223 | hpet_t1_cmp += delta; | |
1224 | hpet_writel(hpet_t1_cmp, HPET_T1_CMP); | |
1225 | lost_ints++; | |
ff08f76d | 1226 | } while (!hpet_cnt_ahead(hpet_t1_cmp, hpet_readl(HPET_COUNTER))); |
e9e2cdb4 TG |
1227 | |
1228 | if (lost_ints) { | |
1229 | if (hpet_rtc_flags & RTC_PIE) | |
1230 | hpet_pie_count += lost_ints; | |
1231 | if (printk_ratelimit()) | |
7e2a31da | 1232 | printk(KERN_WARNING "hpet1: lost %d rtc interrupts\n", |
e9e2cdb4 TG |
1233 | lost_ints); |
1234 | } | |
1235 | } | |
1236 | ||
1237 | irqreturn_t hpet_rtc_interrupt(int irq, void *dev_id) | |
1238 | { | |
1239 | struct rtc_time curr_time; | |
1240 | unsigned long rtc_int_flag = 0; | |
1241 | ||
1242 | hpet_rtc_timer_reinit(); | |
1bdbdaac | 1243 | memset(&curr_time, 0, sizeof(struct rtc_time)); |
e9e2cdb4 TG |
1244 | |
1245 | if (hpet_rtc_flags & (RTC_UIE | RTC_AIE)) | |
1bdbdaac | 1246 | get_rtc_time(&curr_time); |
e9e2cdb4 TG |
1247 | |
1248 | if (hpet_rtc_flags & RTC_UIE && | |
1249 | curr_time.tm_sec != hpet_prev_update_sec) { | |
7e2a31da DB |
1250 | if (hpet_prev_update_sec >= 0) |
1251 | rtc_int_flag = RTC_UF; | |
e9e2cdb4 TG |
1252 | hpet_prev_update_sec = curr_time.tm_sec; |
1253 | } | |
1254 | ||
1255 | if (hpet_rtc_flags & RTC_PIE && | |
1256 | ++hpet_pie_count >= hpet_pie_limit) { | |
1257 | rtc_int_flag |= RTC_PF; | |
1258 | hpet_pie_count = 0; | |
1259 | } | |
1260 | ||
8ee291f8 | 1261 | if (hpet_rtc_flags & RTC_AIE && |
e9e2cdb4 TG |
1262 | (curr_time.tm_sec == hpet_alarm_time.tm_sec) && |
1263 | (curr_time.tm_min == hpet_alarm_time.tm_min) && | |
1264 | (curr_time.tm_hour == hpet_alarm_time.tm_hour)) | |
1265 | rtc_int_flag |= RTC_AF; | |
1266 | ||
1267 | if (rtc_int_flag) { | |
1268 | rtc_int_flag |= (RTC_IRQF | (RTC_NUM_INTS << 8)); | |
1bdbdaac BW |
1269 | if (irq_handler) |
1270 | irq_handler(rtc_int_flag, dev_id); | |
e9e2cdb4 TG |
1271 | } |
1272 | return IRQ_HANDLED; | |
1273 | } | |
1bdbdaac | 1274 | EXPORT_SYMBOL_GPL(hpet_rtc_interrupt); |
e9e2cdb4 | 1275 | #endif |