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block, cfq: misc updates to cfq_io_context
[linux-2.6.git] / drivers / mfd / wm831x-irq.c
blobf4747a4a9a93fb8d3c906d5060442117860ddaf7
1 /*
2 * wm831x-irq.c -- Interrupt controller support for Wolfson WM831x PMICs
3 *
4 * Copyright 2009 Wolfson Microelectronics PLC.
5 *
6 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
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/i2c.h>
18 #include <linux/irq.h>
19 #include <linux/mfd/core.h>
20 #include <linux/interrupt.h>
21
22 #include <linux/mfd/wm831x/core.h>
23 #include <linux/mfd/wm831x/pdata.h>
24 #include <linux/mfd/wm831x/gpio.h>
25 #include <linux/mfd/wm831x/irq.h>
26
27 #include <linux/delay.h>
28
29 struct wm831x_irq_data {
30 int primary;
31 int reg;
32 int mask;
33 };
34
35 static struct wm831x_irq_data wm831x_irqs[] = {
36 [WM831X_IRQ_TEMP_THW] = {
37 .primary = WM831X_TEMP_INT,
38 .reg = 1,
39 .mask = WM831X_TEMP_THW_EINT,
40 },
41 [WM831X_IRQ_GPIO_1] = {
42 .primary = WM831X_GP_INT,
43 .reg = 5,
44 .mask = WM831X_GP1_EINT,
45 },
46 [WM831X_IRQ_GPIO_2] = {
47 .primary = WM831X_GP_INT,
48 .reg = 5,
49 .mask = WM831X_GP2_EINT,
50 },
51 [WM831X_IRQ_GPIO_3] = {
52 .primary = WM831X_GP_INT,
53 .reg = 5,
54 .mask = WM831X_GP3_EINT,
55 },
56 [WM831X_IRQ_GPIO_4] = {
57 .primary = WM831X_GP_INT,
58 .reg = 5,
59 .mask = WM831X_GP4_EINT,
60 },
61 [WM831X_IRQ_GPIO_5] = {
62 .primary = WM831X_GP_INT,
63 .reg = 5,
64 .mask = WM831X_GP5_EINT,
65 },
66 [WM831X_IRQ_GPIO_6] = {
67 .primary = WM831X_GP_INT,
68 .reg = 5,
69 .mask = WM831X_GP6_EINT,
70 },
71 [WM831X_IRQ_GPIO_7] = {
72 .primary = WM831X_GP_INT,
73 .reg = 5,
74 .mask = WM831X_GP7_EINT,
75 },
76 [WM831X_IRQ_GPIO_8] = {
77 .primary = WM831X_GP_INT,
78 .reg = 5,
79 .mask = WM831X_GP8_EINT,
80 },
81 [WM831X_IRQ_GPIO_9] = {
82 .primary = WM831X_GP_INT,
83 .reg = 5,
84 .mask = WM831X_GP9_EINT,
85 },
86 [WM831X_IRQ_GPIO_10] = {
87 .primary = WM831X_GP_INT,
88 .reg = 5,
89 .mask = WM831X_GP10_EINT,
90 },
91 [WM831X_IRQ_GPIO_11] = {
92 .primary = WM831X_GP_INT,
93 .reg = 5,
94 .mask = WM831X_GP11_EINT,
95 },
96 [WM831X_IRQ_GPIO_12] = {
97 .primary = WM831X_GP_INT,
98 .reg = 5,
99 .mask = WM831X_GP12_EINT,
100 },
101 [WM831X_IRQ_GPIO_13] = {
102 .primary = WM831X_GP_INT,
103 .reg = 5,
104 .mask = WM831X_GP13_EINT,
105 },
106 [WM831X_IRQ_GPIO_14] = {
107 .primary = WM831X_GP_INT,
108 .reg = 5,
109 .mask = WM831X_GP14_EINT,
110 },
111 [WM831X_IRQ_GPIO_15] = {
112 .primary = WM831X_GP_INT,
113 .reg = 5,
114 .mask = WM831X_GP15_EINT,
115 },
116 [WM831X_IRQ_GPIO_16] = {
117 .primary = WM831X_GP_INT,
118 .reg = 5,
119 .mask = WM831X_GP16_EINT,
120 },
121 [WM831X_IRQ_ON] = {
122 .primary = WM831X_ON_PIN_INT,
123 .reg = 1,
124 .mask = WM831X_ON_PIN_EINT,
125 },
126 [WM831X_IRQ_PPM_SYSLO] = {
127 .primary = WM831X_PPM_INT,
128 .reg = 1,
129 .mask = WM831X_PPM_SYSLO_EINT,
130 },
131 [WM831X_IRQ_PPM_PWR_SRC] = {
132 .primary = WM831X_PPM_INT,
133 .reg = 1,
134 .mask = WM831X_PPM_PWR_SRC_EINT,
135 },
136 [WM831X_IRQ_PPM_USB_CURR] = {
137 .primary = WM831X_PPM_INT,
138 .reg = 1,
139 .mask = WM831X_PPM_USB_CURR_EINT,
140 },
141 [WM831X_IRQ_WDOG_TO] = {
142 .primary = WM831X_WDOG_INT,
143 .reg = 1,
144 .mask = WM831X_WDOG_TO_EINT,
145 },
146 [WM831X_IRQ_RTC_PER] = {
147 .primary = WM831X_RTC_INT,
148 .reg = 1,
149 .mask = WM831X_RTC_PER_EINT,
150 },
151 [WM831X_IRQ_RTC_ALM] = {
152 .primary = WM831X_RTC_INT,
153 .reg = 1,
154 .mask = WM831X_RTC_ALM_EINT,
155 },
156 [WM831X_IRQ_CHG_BATT_HOT] = {
157 .primary = WM831X_CHG_INT,
158 .reg = 2,
159 .mask = WM831X_CHG_BATT_HOT_EINT,
160 },
161 [WM831X_IRQ_CHG_BATT_COLD] = {
162 .primary = WM831X_CHG_INT,
163 .reg = 2,
164 .mask = WM831X_CHG_BATT_COLD_EINT,
165 },
166 [WM831X_IRQ_CHG_BATT_FAIL] = {
167 .primary = WM831X_CHG_INT,
168 .reg = 2,
169 .mask = WM831X_CHG_BATT_FAIL_EINT,
170 },
171 [WM831X_IRQ_CHG_OV] = {
172 .primary = WM831X_CHG_INT,
173 .reg = 2,
174 .mask = WM831X_CHG_OV_EINT,
175 },
176 [WM831X_IRQ_CHG_END] = {
177 .primary = WM831X_CHG_INT,
178 .reg = 2,
179 .mask = WM831X_CHG_END_EINT,
180 },
181 [WM831X_IRQ_CHG_TO] = {
182 .primary = WM831X_CHG_INT,
183 .reg = 2,
184 .mask = WM831X_CHG_TO_EINT,
185 },
186 [WM831X_IRQ_CHG_MODE] = {
187 .primary = WM831X_CHG_INT,
188 .reg = 2,
189 .mask = WM831X_CHG_MODE_EINT,
190 },
191 [WM831X_IRQ_CHG_START] = {
192 .primary = WM831X_CHG_INT,
193 .reg = 2,
194 .mask = WM831X_CHG_START_EINT,
195 },
196 [WM831X_IRQ_TCHDATA] = {
197 .primary = WM831X_TCHDATA_INT,
198 .reg = 1,
199 .mask = WM831X_TCHDATA_EINT,
200 },
201 [WM831X_IRQ_TCHPD] = {
202 .primary = WM831X_TCHPD_INT,
203 .reg = 1,
204 .mask = WM831X_TCHPD_EINT,
205 },
206 [WM831X_IRQ_AUXADC_DATA] = {
207 .primary = WM831X_AUXADC_INT,
208 .reg = 1,
209 .mask = WM831X_AUXADC_DATA_EINT,
210 },
211 [WM831X_IRQ_AUXADC_DCOMP1] = {
212 .primary = WM831X_AUXADC_INT,
213 .reg = 1,
214 .mask = WM831X_AUXADC_DCOMP1_EINT,
215 },
216 [WM831X_IRQ_AUXADC_DCOMP2] = {
217 .primary = WM831X_AUXADC_INT,
218 .reg = 1,
219 .mask = WM831X_AUXADC_DCOMP2_EINT,
220 },
221 [WM831X_IRQ_AUXADC_DCOMP3] = {
222 .primary = WM831X_AUXADC_INT,
223 .reg = 1,
224 .mask = WM831X_AUXADC_DCOMP3_EINT,
225 },
226 [WM831X_IRQ_AUXADC_DCOMP4] = {
227 .primary = WM831X_AUXADC_INT,
228 .reg = 1,
229 .mask = WM831X_AUXADC_DCOMP4_EINT,
230 },
231 [WM831X_IRQ_CS1] = {
232 .primary = WM831X_CS_INT,
233 .reg = 2,
234 .mask = WM831X_CS1_EINT,
235 },
236 [WM831X_IRQ_CS2] = {
237 .primary = WM831X_CS_INT,
238 .reg = 2,
239 .mask = WM831X_CS2_EINT,
240 },
241 [WM831X_IRQ_HC_DC1] = {
242 .primary = WM831X_HC_INT,
243 .reg = 4,
244 .mask = WM831X_HC_DC1_EINT,
245 },
246 [WM831X_IRQ_HC_DC2] = {
247 .primary = WM831X_HC_INT,
248 .reg = 4,
249 .mask = WM831X_HC_DC2_EINT,
250 },
251 [WM831X_IRQ_UV_LDO1] = {
252 .primary = WM831X_UV_INT,
253 .reg = 3,
254 .mask = WM831X_UV_LDO1_EINT,
255 },
256 [WM831X_IRQ_UV_LDO2] = {
257 .primary = WM831X_UV_INT,
258 .reg = 3,
259 .mask = WM831X_UV_LDO2_EINT,
260 },
261 [WM831X_IRQ_UV_LDO3] = {
262 .primary = WM831X_UV_INT,
263 .reg = 3,
264 .mask = WM831X_UV_LDO3_EINT,
265 },
266 [WM831X_IRQ_UV_LDO4] = {
267 .primary = WM831X_UV_INT,
268 .reg = 3,
269 .mask = WM831X_UV_LDO4_EINT,
270 },
271 [WM831X_IRQ_UV_LDO5] = {
272 .primary = WM831X_UV_INT,
273 .reg = 3,
274 .mask = WM831X_UV_LDO5_EINT,
275 },
276 [WM831X_IRQ_UV_LDO6] = {
277 .primary = WM831X_UV_INT,
278 .reg = 3,
279 .mask = WM831X_UV_LDO6_EINT,
280 },
281 [WM831X_IRQ_UV_LDO7] = {
282 .primary = WM831X_UV_INT,
283 .reg = 3,
284 .mask = WM831X_UV_LDO7_EINT,
285 },
286 [WM831X_IRQ_UV_LDO8] = {
287 .primary = WM831X_UV_INT,
288 .reg = 3,
289 .mask = WM831X_UV_LDO8_EINT,
290 },
291 [WM831X_IRQ_UV_LDO9] = {
292 .primary = WM831X_UV_INT,
293 .reg = 3,
294 .mask = WM831X_UV_LDO9_EINT,
295 },
296 [WM831X_IRQ_UV_LDO10] = {
297 .primary = WM831X_UV_INT,
298 .reg = 3,
299 .mask = WM831X_UV_LDO10_EINT,
300 },
301 [WM831X_IRQ_UV_DC1] = {
302 .primary = WM831X_UV_INT,
303 .reg = 4,
304 .mask = WM831X_UV_DC1_EINT,
305 },
306 [WM831X_IRQ_UV_DC2] = {
307 .primary = WM831X_UV_INT,
308 .reg = 4,
309 .mask = WM831X_UV_DC2_EINT,
310 },
311 [WM831X_IRQ_UV_DC3] = {
312 .primary = WM831X_UV_INT,
313 .reg = 4,
314 .mask = WM831X_UV_DC3_EINT,
315 },
316 [WM831X_IRQ_UV_DC4] = {
317 .primary = WM831X_UV_INT,
318 .reg = 4,
319 .mask = WM831X_UV_DC4_EINT,
320 },
321 };
322
323 static inline int irq_data_to_status_reg(struct wm831x_irq_data *irq_data)
324 {
325 return WM831X_INTERRUPT_STATUS_1 - 1 + irq_data->reg;
326 }
327
328 static inline int irq_data_to_mask_reg(struct wm831x_irq_data *irq_data)
329 {
330 return WM831X_INTERRUPT_STATUS_1_MASK - 1 + irq_data->reg;
331 }
332
333 static inline struct wm831x_irq_data *irq_to_wm831x_irq(struct wm831x *wm831x,
334 int irq)
335 {
336 return &wm831x_irqs[irq - wm831x->irq_base];
337 }
338
339 static void wm831x_irq_lock(struct irq_data *data)
340 {
341 struct wm831x *wm831x = irq_data_get_irq_chip_data(data);
342
343 mutex_lock(&wm831x->irq_lock);
344 }
345
346 static void wm831x_irq_sync_unlock(struct irq_data *data)
347 {
348 struct wm831x *wm831x = irq_data_get_irq_chip_data(data);
349 int i;
350
351 for (i = 0; i < ARRAY_SIZE(wm831x->gpio_update); i++) {
352 if (wm831x->gpio_update[i]) {
353 wm831x_set_bits(wm831x, WM831X_GPIO1_CONTROL + i,
354 WM831X_GPN_INT_MODE | WM831X_GPN_POL,
355 wm831x->gpio_update[i]);
356 wm831x->gpio_update[i] = 0;
357 }
358 }
359
360 for (i = 0; i < ARRAY_SIZE(wm831x->irq_masks_cur); i++) {
361 /* If there's been a change in the mask write it back
362 * to the hardware. */
363 if (wm831x->irq_masks_cur[i] != wm831x->irq_masks_cache[i]) {
364 dev_dbg(wm831x->dev, "IRQ mask sync: %x = %x\n",
365 WM831X_INTERRUPT_STATUS_1_MASK + i,
366 wm831x->irq_masks_cur[i]);
367
368 wm831x->irq_masks_cache[i] = wm831x->irq_masks_cur[i];
369 wm831x_reg_write(wm831x,
370 WM831X_INTERRUPT_STATUS_1_MASK + i,
371 wm831x->irq_masks_cur[i]);
372 }
373 }
374
375 mutex_unlock(&wm831x->irq_lock);
376 }
377
378 static void wm831x_irq_enable(struct irq_data *data)
379 {
380 struct wm831x *wm831x = irq_data_get_irq_chip_data(data);
381 struct wm831x_irq_data *irq_data = irq_to_wm831x_irq(wm831x,
382 data->irq);
383
384 wm831x->irq_masks_cur[irq_data->reg - 1] &= ~irq_data->mask;
385 }
386
387 static void wm831x_irq_disable(struct irq_data *data)
388 {
389 struct wm831x *wm831x = irq_data_get_irq_chip_data(data);
390 struct wm831x_irq_data *irq_data = irq_to_wm831x_irq(wm831x,
391 data->irq);
392
393 wm831x->irq_masks_cur[irq_data->reg - 1] |= irq_data->mask;
394 }
395
396 static int wm831x_irq_set_type(struct irq_data *data, unsigned int type)
397 {
398 struct wm831x *wm831x = irq_data_get_irq_chip_data(data);
399 int irq;
400
401 irq = data->irq - wm831x->irq_base;
402
403 if (irq < WM831X_IRQ_GPIO_1 || irq > WM831X_IRQ_GPIO_11) {
404 /* Ignore internal-only IRQs */
405 if (irq >= 0 && irq < WM831X_NUM_IRQS)
406 return 0;
407 else
408 return -EINVAL;
409 }
410
411 /* Rebase the IRQ into the GPIO range so we've got a sensible array
412 * index.
413 */
414 irq -= WM831X_IRQ_GPIO_1;
415
416 /* We set the high bit to flag that we need an update; don't
417 * do the update here as we can be called with the bus lock
418 * held.
419 */
420 switch (type) {
421 case IRQ_TYPE_EDGE_BOTH:
422 wm831x->gpio_update[irq] = 0x10000 | WM831X_GPN_INT_MODE;
423 wm831x->gpio_level[irq] = false;
424 break;
425 case IRQ_TYPE_EDGE_RISING:
426 wm831x->gpio_update[irq] = 0x10000 | WM831X_GPN_POL;
427 wm831x->gpio_level[irq] = false;
428 break;
429 case IRQ_TYPE_EDGE_FALLING:
430 wm831x->gpio_update[irq] = 0x10000;
431 wm831x->gpio_level[irq] = false;
432 break;
433 case IRQ_TYPE_LEVEL_HIGH:
434 wm831x->gpio_update[irq] = 0x10000 | WM831X_GPN_POL;
435 wm831x->gpio_level[irq] = true;
436 break;
437 default:
438 return -EINVAL;
439 }
440
441 return 0;
442 }
443
444 static struct irq_chip wm831x_irq_chip = {
445 .name = "wm831x",
446 .irq_bus_lock = wm831x_irq_lock,
447 .irq_bus_sync_unlock = wm831x_irq_sync_unlock,
448 .irq_disable = wm831x_irq_disable,
449 .irq_enable = wm831x_irq_enable,
450 .irq_set_type = wm831x_irq_set_type,
451 };
452
453 /* The processing of the primary interrupt occurs in a thread so that
454 * we can interact with the device over I2C or SPI. */
455 static irqreturn_t wm831x_irq_thread(int irq, void *data)
456 {
457 struct wm831x *wm831x = data;
458 unsigned int i;
459 int primary, status_addr, ret;
460 int status_regs[WM831X_NUM_IRQ_REGS] = { 0 };
461 int read[WM831X_NUM_IRQ_REGS] = { 0 };
462 int *status;
463
464 primary = wm831x_reg_read(wm831x, WM831X_SYSTEM_INTERRUPTS);
465 if (primary < 0) {
466 dev_err(wm831x->dev, "Failed to read system interrupt: %d\n",
467 primary);
468 goto out;
469 }
470
471 /* The touch interrupts are visible in the primary register as
472 * an optimisation; open code this to avoid complicating the
473 * main handling loop and so we can also skip iterating the
474 * descriptors.
475 */
476 if (primary & WM831X_TCHPD_INT)
477 handle_nested_irq(wm831x->irq_base + WM831X_IRQ_TCHPD);
478 if (primary & WM831X_TCHDATA_INT)
479 handle_nested_irq(wm831x->irq_base + WM831X_IRQ_TCHDATA);
480 if (primary & (WM831X_TCHDATA_EINT | WM831X_TCHPD_EINT))
481 goto out;
482
483 for (i = 0; i < ARRAY_SIZE(wm831x_irqs); i++) {
484 int offset = wm831x_irqs[i].reg - 1;
485
486 if (!(primary & wm831x_irqs[i].primary))
487 continue;
488
489 status = &status_regs[offset];
490
491 /* Hopefully there should only be one register to read
492 * each time otherwise we ought to do a block read. */
493 if (!read[offset]) {
494 status_addr = irq_data_to_status_reg(&wm831x_irqs[i]);
495
496 *status = wm831x_reg_read(wm831x, status_addr);
497 if (*status < 0) {
498 dev_err(wm831x->dev,
499 "Failed to read IRQ status: %d\n",
500 *status);
501 goto out;
502 }
503
504 read[offset] = 1;
505
506 /* Ignore any bits that we don't think are masked */
507 *status &= ~wm831x->irq_masks_cur[offset];
508
509 /* Acknowledge now so we don't miss
510 * notifications while we handle.
511 */
512 wm831x_reg_write(wm831x, status_addr, *status);
513 }
514
515 if (*status & wm831x_irqs[i].mask)
516 handle_nested_irq(wm831x->irq_base + i);
517
518 /* Simulate an edge triggered IRQ by polling the input
519 * status. This is sucky but improves interoperability.
520 */
521 if (primary == WM831X_GP_INT &&
522 wm831x->gpio_level[i - WM831X_IRQ_GPIO_1]) {
523 ret = wm831x_reg_read(wm831x, WM831X_GPIO_LEVEL);
524 while (ret & 1 << (i - WM831X_IRQ_GPIO_1)) {
525 handle_nested_irq(wm831x->irq_base + i);
526 ret = wm831x_reg_read(wm831x,
527 WM831X_GPIO_LEVEL);
528 }
529 }
530 }
531
532 out:
533 return IRQ_HANDLED;
534 }
535
536 int wm831x_irq_init(struct wm831x *wm831x, int irq)
537 {
538 struct wm831x_pdata *pdata = wm831x->dev->platform_data;
539 int i, cur_irq, ret;
540
541 mutex_init(&wm831x->irq_lock);
542
543 /* Mask the individual interrupt sources */
544 for (i = 0; i < ARRAY_SIZE(wm831x->irq_masks_cur); i++) {
545 wm831x->irq_masks_cur[i] = 0xffff;
546 wm831x->irq_masks_cache[i] = 0xffff;
547 wm831x_reg_write(wm831x, WM831X_INTERRUPT_STATUS_1_MASK + i,
548 0xffff);
549 }
550
551 /* Try to dynamically allocate IRQs if no base is specified */
552 if (!pdata || !pdata->irq_base)
553 wm831x->irq_base = -1;
554 else
555 wm831x->irq_base = pdata->irq_base;
556
557 wm831x->irq_base = irq_alloc_descs(wm831x->irq_base, 0,
558 WM831X_NUM_IRQS, 0);
559 if (wm831x->irq_base < 0) {
560 dev_warn(wm831x->dev, "Failed to allocate IRQs: %d\n",
561 wm831x->irq_base);
562 wm831x->irq_base = 0;
563 return 0;
564 }
565
566 if (pdata && pdata->irq_cmos)
567 i = 0;
568 else
569 i = WM831X_IRQ_OD;
570
571 wm831x_set_bits(wm831x, WM831X_IRQ_CONFIG,
572 WM831X_IRQ_OD, i);
573
574 /* Try to flag /IRQ as a wake source; there are a number of
575 * unconditional wake sources in the PMIC so this isn't
576 * conditional but we don't actually care *too* much if it
577 * fails.
578 */
579 ret = enable_irq_wake(irq);
580 if (ret != 0) {
581 dev_warn(wm831x->dev, "Can't enable IRQ as wake source: %d\n",
582 ret);
583 }
584
585 wm831x->irq = irq;
586
587 /* Register them with genirq */
588 for (cur_irq = wm831x->irq_base;
589 cur_irq < ARRAY_SIZE(wm831x_irqs) + wm831x->irq_base;
590 cur_irq++) {
591 irq_set_chip_data(cur_irq, wm831x);
592 irq_set_chip_and_handler(cur_irq, &wm831x_irq_chip,
593 handle_edge_irq);
594 irq_set_nested_thread(cur_irq, 1);
595
596 /* ARM needs us to explicitly flag the IRQ as valid
597 * and will set them noprobe when we do so. */
598 #ifdef CONFIG_ARM
599 set_irq_flags(cur_irq, IRQF_VALID);
600 #else
601 irq_set_noprobe(cur_irq);
602 #endif
603 }
604
605 if (irq) {
606 ret = request_threaded_irq(irq, NULL, wm831x_irq_thread,
607 IRQF_TRIGGER_LOW | IRQF_ONESHOT,
608 "wm831x", wm831x);
609 if (ret != 0) {
610 dev_err(wm831x->dev, "Failed to request IRQ %d: %d\n",
611 irq, ret);
612 return ret;
613 }
614 } else {
615 dev_warn(wm831x->dev,
616 "No interrupt specified - functionality limited\n");
617 }
618
619 /* Enable top level interrupts, we mask at secondary level */
620 wm831x_reg_write(wm831x, WM831X_SYSTEM_INTERRUPTS_MASK, 0);
621
622 return 0;
623 }
624
625 void wm831x_irq_exit(struct wm831x *wm831x)
626 {
627 if (wm831x->irq)
628 free_irq(wm831x->irq, wm831x);
629 }
Linus' kernel tree