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[S390] kvm-s390: Fix host crash on misbehaving guests
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / mfd / wm8350-irq.c
blobed4b22a167b30104d3628bed7d3ee34753dd867b
1 /*
2 * wm8350-irq.c -- IRQ support for Wolfson WM8350
3 *
4 * Copyright 2007, 2008, 2009 Wolfson Microelectronics PLC.
5 *
6 * Author: Liam Girdwood, Mark Brown
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version.
12 *
13 */
14
15 #include <linux/kernel.h>
16 #include <linux/module.h>
17 #include <linux/init.h>
18 #include <linux/bug.h>
19 #include <linux/device.h>
20 #include <linux/interrupt.h>
21 #include <linux/irq.h>
22
23 #include <linux/mfd/wm8350/core.h>
24 #include <linux/mfd/wm8350/audio.h>
25 #include <linux/mfd/wm8350/comparator.h>
26 #include <linux/mfd/wm8350/gpio.h>
27 #include <linux/mfd/wm8350/pmic.h>
28 #include <linux/mfd/wm8350/rtc.h>
29 #include <linux/mfd/wm8350/supply.h>
30 #include <linux/mfd/wm8350/wdt.h>
31
32 #define WM8350_INT_OFFSET_1 0
33 #define WM8350_INT_OFFSET_2 1
34 #define WM8350_POWER_UP_INT_OFFSET 2
35 #define WM8350_UNDER_VOLTAGE_INT_OFFSET 3
36 #define WM8350_OVER_CURRENT_INT_OFFSET 4
37 #define WM8350_GPIO_INT_OFFSET 5
38 #define WM8350_COMPARATOR_INT_OFFSET 6
39
40 struct wm8350_irq_data {
41 int primary;
42 int reg;
43 int mask;
44 int primary_only;
45 };
46
47 static struct wm8350_irq_data wm8350_irqs[] = {
48 [WM8350_IRQ_OC_LS] = {
49 .primary = WM8350_OC_INT,
50 .reg = WM8350_OVER_CURRENT_INT_OFFSET,
51 .mask = WM8350_OC_LS_EINT,
52 .primary_only = 1,
53 },
54 [WM8350_IRQ_UV_DC1] = {
55 .primary = WM8350_UV_INT,
56 .reg = WM8350_UNDER_VOLTAGE_INT_OFFSET,
57 .mask = WM8350_UV_DC1_EINT,
58 },
59 [WM8350_IRQ_UV_DC2] = {
60 .primary = WM8350_UV_INT,
61 .reg = WM8350_UNDER_VOLTAGE_INT_OFFSET,
62 .mask = WM8350_UV_DC2_EINT,
63 },
64 [WM8350_IRQ_UV_DC3] = {
65 .primary = WM8350_UV_INT,
66 .reg = WM8350_UNDER_VOLTAGE_INT_OFFSET,
67 .mask = WM8350_UV_DC3_EINT,
68 },
69 [WM8350_IRQ_UV_DC4] = {
70 .primary = WM8350_UV_INT,
71 .reg = WM8350_UNDER_VOLTAGE_INT_OFFSET,
72 .mask = WM8350_UV_DC4_EINT,
73 },
74 [WM8350_IRQ_UV_DC5] = {
75 .primary = WM8350_UV_INT,
76 .reg = WM8350_UNDER_VOLTAGE_INT_OFFSET,
77 .mask = WM8350_UV_DC5_EINT,
78 },
79 [WM8350_IRQ_UV_DC6] = {
80 .primary = WM8350_UV_INT,
81 .reg = WM8350_UNDER_VOLTAGE_INT_OFFSET,
82 .mask = WM8350_UV_DC6_EINT,
83 },
84 [WM8350_IRQ_UV_LDO1] = {
85 .primary = WM8350_UV_INT,
86 .reg = WM8350_UNDER_VOLTAGE_INT_OFFSET,
87 .mask = WM8350_UV_LDO1_EINT,
88 },
89 [WM8350_IRQ_UV_LDO2] = {
90 .primary = WM8350_UV_INT,
91 .reg = WM8350_UNDER_VOLTAGE_INT_OFFSET,
92 .mask = WM8350_UV_LDO2_EINT,
93 },
94 [WM8350_IRQ_UV_LDO3] = {
95 .primary = WM8350_UV_INT,
96 .reg = WM8350_UNDER_VOLTAGE_INT_OFFSET,
97 .mask = WM8350_UV_LDO3_EINT,
98 },
99 [WM8350_IRQ_UV_LDO4] = {
100 .primary = WM8350_UV_INT,
101 .reg = WM8350_UNDER_VOLTAGE_INT_OFFSET,
102 .mask = WM8350_UV_LDO4_EINT,
103 },
104 [WM8350_IRQ_CHG_BAT_HOT] = {
105 .primary = WM8350_CHG_INT,
106 .reg = WM8350_INT_OFFSET_1,
107 .mask = WM8350_CHG_BAT_HOT_EINT,
108 },
109 [WM8350_IRQ_CHG_BAT_COLD] = {
110 .primary = WM8350_CHG_INT,
111 .reg = WM8350_INT_OFFSET_1,
112 .mask = WM8350_CHG_BAT_COLD_EINT,
113 },
114 [WM8350_IRQ_CHG_BAT_FAIL] = {
115 .primary = WM8350_CHG_INT,
116 .reg = WM8350_INT_OFFSET_1,
117 .mask = WM8350_CHG_BAT_FAIL_EINT,
118 },
119 [WM8350_IRQ_CHG_TO] = {
120 .primary = WM8350_CHG_INT,
121 .reg = WM8350_INT_OFFSET_1,
122 .mask = WM8350_CHG_TO_EINT,
123 },
124 [WM8350_IRQ_CHG_END] = {
125 .primary = WM8350_CHG_INT,
126 .reg = WM8350_INT_OFFSET_1,
127 .mask = WM8350_CHG_END_EINT,
128 },
129 [WM8350_IRQ_CHG_START] = {
130 .primary = WM8350_CHG_INT,
131 .reg = WM8350_INT_OFFSET_1,
132 .mask = WM8350_CHG_START_EINT,
133 },
134 [WM8350_IRQ_CHG_FAST_RDY] = {
135 .primary = WM8350_CHG_INT,
136 .reg = WM8350_INT_OFFSET_1,
137 .mask = WM8350_CHG_FAST_RDY_EINT,
138 },
139 [WM8350_IRQ_CHG_VBATT_LT_3P9] = {
140 .primary = WM8350_CHG_INT,
141 .reg = WM8350_INT_OFFSET_1,
142 .mask = WM8350_CHG_VBATT_LT_3P9_EINT,
143 },
144 [WM8350_IRQ_CHG_VBATT_LT_3P1] = {
145 .primary = WM8350_CHG_INT,
146 .reg = WM8350_INT_OFFSET_1,
147 .mask = WM8350_CHG_VBATT_LT_3P1_EINT,
148 },
149 [WM8350_IRQ_CHG_VBATT_LT_2P85] = {
150 .primary = WM8350_CHG_INT,
151 .reg = WM8350_INT_OFFSET_1,
152 .mask = WM8350_CHG_VBATT_LT_2P85_EINT,
153 },
154 [WM8350_IRQ_RTC_ALM] = {
155 .primary = WM8350_RTC_INT,
156 .reg = WM8350_INT_OFFSET_1,
157 .mask = WM8350_RTC_ALM_EINT,
158 },
159 [WM8350_IRQ_RTC_SEC] = {
160 .primary = WM8350_RTC_INT,
161 .reg = WM8350_INT_OFFSET_1,
162 .mask = WM8350_RTC_SEC_EINT,
163 },
164 [WM8350_IRQ_RTC_PER] = {
165 .primary = WM8350_RTC_INT,
166 .reg = WM8350_INT_OFFSET_1,
167 .mask = WM8350_RTC_PER_EINT,
168 },
169 [WM8350_IRQ_CS1] = {
170 .primary = WM8350_CS_INT,
171 .reg = WM8350_INT_OFFSET_2,
172 .mask = WM8350_CS1_EINT,
173 },
174 [WM8350_IRQ_CS2] = {
175 .primary = WM8350_CS_INT,
176 .reg = WM8350_INT_OFFSET_2,
177 .mask = WM8350_CS2_EINT,
178 },
179 [WM8350_IRQ_SYS_HYST_COMP_FAIL] = {
180 .primary = WM8350_SYS_INT,
181 .reg = WM8350_INT_OFFSET_2,
182 .mask = WM8350_SYS_HYST_COMP_FAIL_EINT,
183 },
184 [WM8350_IRQ_SYS_CHIP_GT115] = {
185 .primary = WM8350_SYS_INT,
186 .reg = WM8350_INT_OFFSET_2,
187 .mask = WM8350_SYS_CHIP_GT115_EINT,
188 },
189 [WM8350_IRQ_SYS_CHIP_GT140] = {
190 .primary = WM8350_SYS_INT,
191 .reg = WM8350_INT_OFFSET_2,
192 .mask = WM8350_SYS_CHIP_GT140_EINT,
193 },
194 [WM8350_IRQ_SYS_WDOG_TO] = {
195 .primary = WM8350_SYS_INT,
196 .reg = WM8350_INT_OFFSET_2,
197 .mask = WM8350_SYS_WDOG_TO_EINT,
198 },
199 [WM8350_IRQ_AUXADC_DATARDY] = {
200 .primary = WM8350_AUXADC_INT,
201 .reg = WM8350_INT_OFFSET_2,
202 .mask = WM8350_AUXADC_DATARDY_EINT,
203 },
204 [WM8350_IRQ_AUXADC_DCOMP4] = {
205 .primary = WM8350_AUXADC_INT,
206 .reg = WM8350_INT_OFFSET_2,
207 .mask = WM8350_AUXADC_DCOMP4_EINT,
208 },
209 [WM8350_IRQ_AUXADC_DCOMP3] = {
210 .primary = WM8350_AUXADC_INT,
211 .reg = WM8350_INT_OFFSET_2,
212 .mask = WM8350_AUXADC_DCOMP3_EINT,
213 },
214 [WM8350_IRQ_AUXADC_DCOMP2] = {
215 .primary = WM8350_AUXADC_INT,
216 .reg = WM8350_INT_OFFSET_2,
217 .mask = WM8350_AUXADC_DCOMP2_EINT,
218 },
219 [WM8350_IRQ_AUXADC_DCOMP1] = {
220 .primary = WM8350_AUXADC_INT,
221 .reg = WM8350_INT_OFFSET_2,
222 .mask = WM8350_AUXADC_DCOMP1_EINT,
223 },
224 [WM8350_IRQ_USB_LIMIT] = {
225 .primary = WM8350_USB_INT,
226 .reg = WM8350_INT_OFFSET_2,
227 .mask = WM8350_USB_LIMIT_EINT,
228 .primary_only = 1,
229 },
230 [WM8350_IRQ_WKUP_OFF_STATE] = {
231 .primary = WM8350_WKUP_INT,
232 .reg = WM8350_COMPARATOR_INT_OFFSET,
233 .mask = WM8350_WKUP_OFF_STATE_EINT,
234 },
235 [WM8350_IRQ_WKUP_HIB_STATE] = {
236 .primary = WM8350_WKUP_INT,
237 .reg = WM8350_COMPARATOR_INT_OFFSET,
238 .mask = WM8350_WKUP_HIB_STATE_EINT,
239 },
240 [WM8350_IRQ_WKUP_CONV_FAULT] = {
241 .primary = WM8350_WKUP_INT,
242 .reg = WM8350_COMPARATOR_INT_OFFSET,
243 .mask = WM8350_WKUP_CONV_FAULT_EINT,
244 },
245 [WM8350_IRQ_WKUP_WDOG_RST] = {
246 .primary = WM8350_WKUP_INT,
247 .reg = WM8350_COMPARATOR_INT_OFFSET,
248 .mask = WM8350_WKUP_WDOG_RST_EINT,
249 },
250 [WM8350_IRQ_WKUP_GP_PWR_ON] = {
251 .primary = WM8350_WKUP_INT,
252 .reg = WM8350_COMPARATOR_INT_OFFSET,
253 .mask = WM8350_WKUP_GP_PWR_ON_EINT,
254 },
255 [WM8350_IRQ_WKUP_ONKEY] = {
256 .primary = WM8350_WKUP_INT,
257 .reg = WM8350_COMPARATOR_INT_OFFSET,
258 .mask = WM8350_WKUP_ONKEY_EINT,
259 },
260 [WM8350_IRQ_WKUP_GP_WAKEUP] = {
261 .primary = WM8350_WKUP_INT,
262 .reg = WM8350_COMPARATOR_INT_OFFSET,
263 .mask = WM8350_WKUP_GP_WAKEUP_EINT,
264 },
265 [WM8350_IRQ_CODEC_JCK_DET_L] = {
266 .primary = WM8350_CODEC_INT,
267 .reg = WM8350_COMPARATOR_INT_OFFSET,
268 .mask = WM8350_CODEC_JCK_DET_L_EINT,
269 },
270 [WM8350_IRQ_CODEC_JCK_DET_R] = {
271 .primary = WM8350_CODEC_INT,
272 .reg = WM8350_COMPARATOR_INT_OFFSET,
273 .mask = WM8350_CODEC_JCK_DET_R_EINT,
274 },
275 [WM8350_IRQ_CODEC_MICSCD] = {
276 .primary = WM8350_CODEC_INT,
277 .reg = WM8350_COMPARATOR_INT_OFFSET,
278 .mask = WM8350_CODEC_MICSCD_EINT,
279 },
280 [WM8350_IRQ_CODEC_MICD] = {
281 .primary = WM8350_CODEC_INT,
282 .reg = WM8350_COMPARATOR_INT_OFFSET,
283 .mask = WM8350_CODEC_MICD_EINT,
284 },
285 [WM8350_IRQ_EXT_USB_FB] = {
286 .primary = WM8350_EXT_INT,
287 .reg = WM8350_COMPARATOR_INT_OFFSET,
288 .mask = WM8350_EXT_USB_FB_EINT,
289 },
290 [WM8350_IRQ_EXT_WALL_FB] = {
291 .primary = WM8350_EXT_INT,
292 .reg = WM8350_COMPARATOR_INT_OFFSET,
293 .mask = WM8350_EXT_WALL_FB_EINT,
294 },
295 [WM8350_IRQ_EXT_BAT_FB] = {
296 .primary = WM8350_EXT_INT,
297 .reg = WM8350_COMPARATOR_INT_OFFSET,
298 .mask = WM8350_EXT_BAT_FB_EINT,
299 },
300 [WM8350_IRQ_GPIO(0)] = {
301 .primary = WM8350_GP_INT,
302 .reg = WM8350_GPIO_INT_OFFSET,
303 .mask = WM8350_GP0_EINT,
304 },
305 [WM8350_IRQ_GPIO(1)] = {
306 .primary = WM8350_GP_INT,
307 .reg = WM8350_GPIO_INT_OFFSET,
308 .mask = WM8350_GP1_EINT,
309 },
310 [WM8350_IRQ_GPIO(2)] = {
311 .primary = WM8350_GP_INT,
312 .reg = WM8350_GPIO_INT_OFFSET,
313 .mask = WM8350_GP2_EINT,
314 },
315 [WM8350_IRQ_GPIO(3)] = {
316 .primary = WM8350_GP_INT,
317 .reg = WM8350_GPIO_INT_OFFSET,
318 .mask = WM8350_GP3_EINT,
319 },
320 [WM8350_IRQ_GPIO(4)] = {
321 .primary = WM8350_GP_INT,
322 .reg = WM8350_GPIO_INT_OFFSET,
323 .mask = WM8350_GP4_EINT,
324 },
325 [WM8350_IRQ_GPIO(5)] = {
326 .primary = WM8350_GP_INT,
327 .reg = WM8350_GPIO_INT_OFFSET,
328 .mask = WM8350_GP5_EINT,
329 },
330 [WM8350_IRQ_GPIO(6)] = {
331 .primary = WM8350_GP_INT,
332 .reg = WM8350_GPIO_INT_OFFSET,
333 .mask = WM8350_GP6_EINT,
334 },
335 [WM8350_IRQ_GPIO(7)] = {
336 .primary = WM8350_GP_INT,
337 .reg = WM8350_GPIO_INT_OFFSET,
338 .mask = WM8350_GP7_EINT,
339 },
340 [WM8350_IRQ_GPIO(8)] = {
341 .primary = WM8350_GP_INT,
342 .reg = WM8350_GPIO_INT_OFFSET,
343 .mask = WM8350_GP8_EINT,
344 },
345 [WM8350_IRQ_GPIO(9)] = {
346 .primary = WM8350_GP_INT,
347 .reg = WM8350_GPIO_INT_OFFSET,
348 .mask = WM8350_GP9_EINT,
349 },
350 [WM8350_IRQ_GPIO(10)] = {
351 .primary = WM8350_GP_INT,
352 .reg = WM8350_GPIO_INT_OFFSET,
353 .mask = WM8350_GP10_EINT,
354 },
355 [WM8350_IRQ_GPIO(11)] = {
356 .primary = WM8350_GP_INT,
357 .reg = WM8350_GPIO_INT_OFFSET,
358 .mask = WM8350_GP11_EINT,
359 },
360 [WM8350_IRQ_GPIO(12)] = {
361 .primary = WM8350_GP_INT,
362 .reg = WM8350_GPIO_INT_OFFSET,
363 .mask = WM8350_GP12_EINT,
364 },
365 };
366
367 static inline struct wm8350_irq_data *irq_to_wm8350_irq(struct wm8350 *wm8350,
368 int irq)
369 {
370 return &wm8350_irqs[irq - wm8350->irq_base];
371 }
372
373 /*
374 * This is a threaded IRQ handler so can access I2C/SPI. Since all
375 * interrupts are clear on read the IRQ line will be reasserted and
376 * the physical IRQ will be handled again if another interrupt is
377 * asserted while we run - in the normal course of events this is a
378 * rare occurrence so we save I2C/SPI reads. We're also assuming that
379 * it's rare to get lots of interrupts firing simultaneously so try to
380 * minimise I/O.
381 */
382 static irqreturn_t wm8350_irq(int irq, void *irq_data)
383 {
384 struct wm8350 *wm8350 = irq_data;
385 u16 level_one;
386 u16 sub_reg[WM8350_NUM_IRQ_REGS];
387 int read_done[WM8350_NUM_IRQ_REGS];
388 struct wm8350_irq_data *data;
389 int i;
390
391 level_one = wm8350_reg_read(wm8350, WM8350_SYSTEM_INTERRUPTS)
392 & ~wm8350_reg_read(wm8350, WM8350_SYSTEM_INTERRUPTS_MASK);
393
394 if (!level_one)
395 return IRQ_NONE;
396
397 memset(&read_done, 0, sizeof(read_done));
398
399 for (i = 0; i < ARRAY_SIZE(wm8350_irqs); i++) {
400 data = &wm8350_irqs[i];
401
402 if (!(level_one & data->primary))
403 continue;
404
405 if (!read_done[data->reg]) {
406 sub_reg[data->reg] =
407 wm8350_reg_read(wm8350, WM8350_INT_STATUS_1 +
408 data->reg);
409 sub_reg[data->reg] &= ~wm8350->irq_masks[data->reg];
410 read_done[data->reg] = 1;
411 }
412
413 if (sub_reg[data->reg] & data->mask)
414 handle_nested_irq(wm8350->irq_base + i);
415 }
416
417 return IRQ_HANDLED;
418 }
419
420 static void wm8350_irq_lock(struct irq_data *data)
421 {
422 struct wm8350 *wm8350 = irq_data_get_irq_chip_data(data);
423
424 mutex_lock(&wm8350->irq_lock);
425 }
426
427 static void wm8350_irq_sync_unlock(struct irq_data *data)
428 {
429 struct wm8350 *wm8350 = irq_data_get_irq_chip_data(data);
430 int i;
431
432 for (i = 0; i < ARRAY_SIZE(wm8350->irq_masks); i++) {
433 /* If there's been a change in the mask write it back
434 * to the hardware. */
435 if (wm8350->irq_masks[i] !=
436 wm8350->reg_cache[WM8350_INT_STATUS_1_MASK + i])
437 WARN_ON(wm8350_reg_write(wm8350,
438 WM8350_INT_STATUS_1_MASK + i,
439 wm8350->irq_masks[i]));
440 }
441
442 mutex_unlock(&wm8350->irq_lock);
443 }
444
445 static void wm8350_irq_enable(struct irq_data *data)
446 {
447 struct wm8350 *wm8350 = irq_data_get_irq_chip_data(data);
448 struct wm8350_irq_data *irq_data = irq_to_wm8350_irq(wm8350,
449 data->irq);
450
451 wm8350->irq_masks[irq_data->reg] &= ~irq_data->mask;
452 }
453
454 static void wm8350_irq_disable(struct irq_data *data)
455 {
456 struct wm8350 *wm8350 = irq_data_get_irq_chip_data(data);
457 struct wm8350_irq_data *irq_data = irq_to_wm8350_irq(wm8350,
458 data->irq);
459
460 wm8350->irq_masks[irq_data->reg] |= irq_data->mask;
461 }
462
463 static struct irq_chip wm8350_irq_chip = {
464 .name = "wm8350",
465 .irq_bus_lock = wm8350_irq_lock,
466 .irq_bus_sync_unlock = wm8350_irq_sync_unlock,
467 .irq_disable = wm8350_irq_disable,
468 .irq_enable = wm8350_irq_enable,
469 };
470
471 int wm8350_irq_init(struct wm8350 *wm8350, int irq,
472 struct wm8350_platform_data *pdata)
473 {
474 int ret, cur_irq, i;
475 int flags = IRQF_ONESHOT;
476
477 if (!irq) {
478 dev_warn(wm8350->dev, "No interrupt support, no core IRQ\n");
479 return 0;
480 }
481
482 if (!pdata || !pdata->irq_base) {
483 dev_warn(wm8350->dev, "No interrupt support, no IRQ base\n");
484 return 0;
485 }
486
487 /* Mask top level interrupts */
488 wm8350_reg_write(wm8350, WM8350_SYSTEM_INTERRUPTS_MASK, 0xFFFF);
489
490 /* Mask all individual interrupts by default and cache the
491 * masks. We read the masks back since there are unwritable
492 * bits in the mask registers. */
493 for (i = 0; i < ARRAY_SIZE(wm8350->irq_masks); i++) {
494 wm8350_reg_write(wm8350, WM8350_INT_STATUS_1_MASK + i,
495 0xFFFF);
496 wm8350->irq_masks[i] =
497 wm8350_reg_read(wm8350,
498 WM8350_INT_STATUS_1_MASK + i);
499 }
500
501 mutex_init(&wm8350->irq_lock);
502 wm8350->chip_irq = irq;
503 wm8350->irq_base = pdata->irq_base;
504
505 if (pdata->irq_high) {
506 flags |= IRQF_TRIGGER_HIGH;
507
508 wm8350_set_bits(wm8350, WM8350_SYSTEM_CONTROL_1,
509 WM8350_IRQ_POL);
510 } else {
511 flags |= IRQF_TRIGGER_LOW;
512
513 wm8350_clear_bits(wm8350, WM8350_SYSTEM_CONTROL_1,
514 WM8350_IRQ_POL);
515 }
516
517 /* Register with genirq */
518 for (cur_irq = wm8350->irq_base;
519 cur_irq < ARRAY_SIZE(wm8350_irqs) + wm8350->irq_base;
520 cur_irq++) {
521 irq_set_chip_data(cur_irq, wm8350);
522 irq_set_chip_and_handler(cur_irq, &wm8350_irq_chip,
523 handle_edge_irq);
524 irq_set_nested_thread(cur_irq, 1);
525
526 /* ARM needs us to explicitly flag the IRQ as valid
527 * and will set them noprobe when we do so. */
528 #ifdef CONFIG_ARM
529 set_irq_flags(cur_irq, IRQF_VALID);
530 #else
531 irq_set_noprobe(cur_irq);
532 #endif
533 }
534
535 ret = request_threaded_irq(irq, NULL, wm8350_irq, flags,
536 "wm8350", wm8350);
537 if (ret != 0)
538 dev_err(wm8350->dev, "Failed to request IRQ: %d\n", ret);
539
540 /* Allow interrupts to fire */
541 wm8350_reg_write(wm8350, WM8350_SYSTEM_INTERRUPTS_MASK, 0);
542
543 return ret;
544 }
545
546 int wm8350_irq_exit(struct wm8350 *wm8350)
547 {
548 free_irq(wm8350->chip_irq, wm8350);
549 return 0;
550 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree