blob: 7dabe4dbd3732e1d75c396b9b1e01bdeafafa57c [file] [log] [blame]
Mark Brown7d4d0a32009-07-27 14:45:53 +01001/*
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>
Mark Brown5fb4d382009-11-11 16:10:22 +000018#include <linux/irq.h>
Mark Brown7d4d0a32009-07-27 14:45:53 +010019#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>
Mark Brown896060c2010-05-07 18:39:25 +010024#include <linux/mfd/wm831x/gpio.h>
Mark Brown7d4d0a32009-07-27 14:45:53 +010025#include <linux/mfd/wm831x/irq.h>
26
27#include <linux/delay.h>
28
29/*
30 * Since generic IRQs don't currently support interrupt controllers on
31 * interrupt driven buses we don't use genirq but instead provide an
32 * interface that looks very much like the standard ones. This leads
33 * to some bodges, including storing interrupt handler information in
34 * the static irq_data table we use to look up the data for individual
35 * interrupts, but hopefully won't last too long.
36 */
37
38struct wm831x_irq_data {
39 int primary;
40 int reg;
41 int mask;
Mark Brown7d4d0a32009-07-27 14:45:53 +010042};
43
44static struct wm831x_irq_data wm831x_irqs[] = {
45 [WM831X_IRQ_TEMP_THW] = {
46 .primary = WM831X_TEMP_INT,
47 .reg = 1,
48 .mask = WM831X_TEMP_THW_EINT,
49 },
50 [WM831X_IRQ_GPIO_1] = {
51 .primary = WM831X_GP_INT,
52 .reg = 5,
53 .mask = WM831X_GP1_EINT,
54 },
55 [WM831X_IRQ_GPIO_2] = {
56 .primary = WM831X_GP_INT,
57 .reg = 5,
58 .mask = WM831X_GP2_EINT,
59 },
60 [WM831X_IRQ_GPIO_3] = {
61 .primary = WM831X_GP_INT,
62 .reg = 5,
63 .mask = WM831X_GP3_EINT,
64 },
65 [WM831X_IRQ_GPIO_4] = {
66 .primary = WM831X_GP_INT,
67 .reg = 5,
68 .mask = WM831X_GP4_EINT,
69 },
70 [WM831X_IRQ_GPIO_5] = {
71 .primary = WM831X_GP_INT,
72 .reg = 5,
73 .mask = WM831X_GP5_EINT,
74 },
75 [WM831X_IRQ_GPIO_6] = {
76 .primary = WM831X_GP_INT,
77 .reg = 5,
78 .mask = WM831X_GP6_EINT,
79 },
80 [WM831X_IRQ_GPIO_7] = {
81 .primary = WM831X_GP_INT,
82 .reg = 5,
83 .mask = WM831X_GP7_EINT,
84 },
85 [WM831X_IRQ_GPIO_8] = {
86 .primary = WM831X_GP_INT,
87 .reg = 5,
88 .mask = WM831X_GP8_EINT,
89 },
90 [WM831X_IRQ_GPIO_9] = {
91 .primary = WM831X_GP_INT,
92 .reg = 5,
93 .mask = WM831X_GP9_EINT,
94 },
95 [WM831X_IRQ_GPIO_10] = {
96 .primary = WM831X_GP_INT,
97 .reg = 5,
98 .mask = WM831X_GP10_EINT,
99 },
100 [WM831X_IRQ_GPIO_11] = {
101 .primary = WM831X_GP_INT,
102 .reg = 5,
103 .mask = WM831X_GP11_EINT,
104 },
105 [WM831X_IRQ_GPIO_12] = {
106 .primary = WM831X_GP_INT,
107 .reg = 5,
108 .mask = WM831X_GP12_EINT,
109 },
110 [WM831X_IRQ_GPIO_13] = {
111 .primary = WM831X_GP_INT,
112 .reg = 5,
113 .mask = WM831X_GP13_EINT,
114 },
115 [WM831X_IRQ_GPIO_14] = {
116 .primary = WM831X_GP_INT,
117 .reg = 5,
118 .mask = WM831X_GP14_EINT,
119 },
120 [WM831X_IRQ_GPIO_15] = {
121 .primary = WM831X_GP_INT,
122 .reg = 5,
123 .mask = WM831X_GP15_EINT,
124 },
125 [WM831X_IRQ_GPIO_16] = {
126 .primary = WM831X_GP_INT,
127 .reg = 5,
128 .mask = WM831X_GP16_EINT,
129 },
130 [WM831X_IRQ_ON] = {
131 .primary = WM831X_ON_PIN_INT,
132 .reg = 1,
133 .mask = WM831X_ON_PIN_EINT,
134 },
135 [WM831X_IRQ_PPM_SYSLO] = {
136 .primary = WM831X_PPM_INT,
137 .reg = 1,
138 .mask = WM831X_PPM_SYSLO_EINT,
139 },
140 [WM831X_IRQ_PPM_PWR_SRC] = {
141 .primary = WM831X_PPM_INT,
142 .reg = 1,
143 .mask = WM831X_PPM_PWR_SRC_EINT,
144 },
145 [WM831X_IRQ_PPM_USB_CURR] = {
146 .primary = WM831X_PPM_INT,
147 .reg = 1,
148 .mask = WM831X_PPM_USB_CURR_EINT,
149 },
150 [WM831X_IRQ_WDOG_TO] = {
151 .primary = WM831X_WDOG_INT,
152 .reg = 1,
153 .mask = WM831X_WDOG_TO_EINT,
154 },
155 [WM831X_IRQ_RTC_PER] = {
156 .primary = WM831X_RTC_INT,
157 .reg = 1,
158 .mask = WM831X_RTC_PER_EINT,
159 },
160 [WM831X_IRQ_RTC_ALM] = {
161 .primary = WM831X_RTC_INT,
162 .reg = 1,
163 .mask = WM831X_RTC_ALM_EINT,
164 },
165 [WM831X_IRQ_CHG_BATT_HOT] = {
166 .primary = WM831X_CHG_INT,
167 .reg = 2,
168 .mask = WM831X_CHG_BATT_HOT_EINT,
169 },
170 [WM831X_IRQ_CHG_BATT_COLD] = {
171 .primary = WM831X_CHG_INT,
172 .reg = 2,
173 .mask = WM831X_CHG_BATT_COLD_EINT,
174 },
175 [WM831X_IRQ_CHG_BATT_FAIL] = {
176 .primary = WM831X_CHG_INT,
177 .reg = 2,
178 .mask = WM831X_CHG_BATT_FAIL_EINT,
179 },
180 [WM831X_IRQ_CHG_OV] = {
181 .primary = WM831X_CHG_INT,
182 .reg = 2,
183 .mask = WM831X_CHG_OV_EINT,
184 },
185 [WM831X_IRQ_CHG_END] = {
186 .primary = WM831X_CHG_INT,
187 .reg = 2,
188 .mask = WM831X_CHG_END_EINT,
189 },
190 [WM831X_IRQ_CHG_TO] = {
191 .primary = WM831X_CHG_INT,
192 .reg = 2,
193 .mask = WM831X_CHG_TO_EINT,
194 },
195 [WM831X_IRQ_CHG_MODE] = {
196 .primary = WM831X_CHG_INT,
197 .reg = 2,
198 .mask = WM831X_CHG_MODE_EINT,
199 },
200 [WM831X_IRQ_CHG_START] = {
201 .primary = WM831X_CHG_INT,
202 .reg = 2,
203 .mask = WM831X_CHG_START_EINT,
204 },
205 [WM831X_IRQ_TCHDATA] = {
206 .primary = WM831X_TCHDATA_INT,
207 .reg = 1,
208 .mask = WM831X_TCHDATA_EINT,
209 },
210 [WM831X_IRQ_TCHPD] = {
211 .primary = WM831X_TCHPD_INT,
212 .reg = 1,
213 .mask = WM831X_TCHPD_EINT,
214 },
215 [WM831X_IRQ_AUXADC_DATA] = {
216 .primary = WM831X_AUXADC_INT,
217 .reg = 1,
218 .mask = WM831X_AUXADC_DATA_EINT,
219 },
220 [WM831X_IRQ_AUXADC_DCOMP1] = {
221 .primary = WM831X_AUXADC_INT,
222 .reg = 1,
223 .mask = WM831X_AUXADC_DCOMP1_EINT,
224 },
225 [WM831X_IRQ_AUXADC_DCOMP2] = {
226 .primary = WM831X_AUXADC_INT,
227 .reg = 1,
228 .mask = WM831X_AUXADC_DCOMP2_EINT,
229 },
230 [WM831X_IRQ_AUXADC_DCOMP3] = {
231 .primary = WM831X_AUXADC_INT,
232 .reg = 1,
233 .mask = WM831X_AUXADC_DCOMP3_EINT,
234 },
235 [WM831X_IRQ_AUXADC_DCOMP4] = {
236 .primary = WM831X_AUXADC_INT,
237 .reg = 1,
238 .mask = WM831X_AUXADC_DCOMP4_EINT,
239 },
240 [WM831X_IRQ_CS1] = {
241 .primary = WM831X_CS_INT,
242 .reg = 2,
243 .mask = WM831X_CS1_EINT,
244 },
245 [WM831X_IRQ_CS2] = {
246 .primary = WM831X_CS_INT,
247 .reg = 2,
248 .mask = WM831X_CS2_EINT,
249 },
250 [WM831X_IRQ_HC_DC1] = {
251 .primary = WM831X_HC_INT,
252 .reg = 4,
253 .mask = WM831X_HC_DC1_EINT,
254 },
255 [WM831X_IRQ_HC_DC2] = {
256 .primary = WM831X_HC_INT,
257 .reg = 4,
258 .mask = WM831X_HC_DC2_EINT,
259 },
260 [WM831X_IRQ_UV_LDO1] = {
261 .primary = WM831X_UV_INT,
262 .reg = 3,
263 .mask = WM831X_UV_LDO1_EINT,
264 },
265 [WM831X_IRQ_UV_LDO2] = {
266 .primary = WM831X_UV_INT,
267 .reg = 3,
268 .mask = WM831X_UV_LDO2_EINT,
269 },
270 [WM831X_IRQ_UV_LDO3] = {
271 .primary = WM831X_UV_INT,
272 .reg = 3,
273 .mask = WM831X_UV_LDO3_EINT,
274 },
275 [WM831X_IRQ_UV_LDO4] = {
276 .primary = WM831X_UV_INT,
277 .reg = 3,
278 .mask = WM831X_UV_LDO4_EINT,
279 },
280 [WM831X_IRQ_UV_LDO5] = {
281 .primary = WM831X_UV_INT,
282 .reg = 3,
283 .mask = WM831X_UV_LDO5_EINT,
284 },
285 [WM831X_IRQ_UV_LDO6] = {
286 .primary = WM831X_UV_INT,
287 .reg = 3,
288 .mask = WM831X_UV_LDO6_EINT,
289 },
290 [WM831X_IRQ_UV_LDO7] = {
291 .primary = WM831X_UV_INT,
292 .reg = 3,
293 .mask = WM831X_UV_LDO7_EINT,
294 },
295 [WM831X_IRQ_UV_LDO8] = {
296 .primary = WM831X_UV_INT,
297 .reg = 3,
298 .mask = WM831X_UV_LDO8_EINT,
299 },
300 [WM831X_IRQ_UV_LDO9] = {
301 .primary = WM831X_UV_INT,
302 .reg = 3,
303 .mask = WM831X_UV_LDO9_EINT,
304 },
305 [WM831X_IRQ_UV_LDO10] = {
306 .primary = WM831X_UV_INT,
307 .reg = 3,
308 .mask = WM831X_UV_LDO10_EINT,
309 },
310 [WM831X_IRQ_UV_DC1] = {
311 .primary = WM831X_UV_INT,
312 .reg = 4,
313 .mask = WM831X_UV_DC1_EINT,
314 },
315 [WM831X_IRQ_UV_DC2] = {
316 .primary = WM831X_UV_INT,
317 .reg = 4,
318 .mask = WM831X_UV_DC2_EINT,
319 },
320 [WM831X_IRQ_UV_DC3] = {
321 .primary = WM831X_UV_INT,
322 .reg = 4,
323 .mask = WM831X_UV_DC3_EINT,
324 },
325 [WM831X_IRQ_UV_DC4] = {
326 .primary = WM831X_UV_INT,
327 .reg = 4,
328 .mask = WM831X_UV_DC4_EINT,
329 },
330};
331
332static inline int irq_data_to_status_reg(struct wm831x_irq_data *irq_data)
333{
334 return WM831X_INTERRUPT_STATUS_1 - 1 + irq_data->reg;
335}
336
337static inline int irq_data_to_mask_reg(struct wm831x_irq_data *irq_data)
338{
339 return WM831X_INTERRUPT_STATUS_1_MASK - 1 + irq_data->reg;
340}
341
Mark Brown5fb4d382009-11-11 16:10:22 +0000342static inline struct wm831x_irq_data *irq_to_wm831x_irq(struct wm831x *wm831x,
343 int irq)
Mark Brown7d4d0a32009-07-27 14:45:53 +0100344{
Mark Brown5fb4d382009-11-11 16:10:22 +0000345 return &wm831x_irqs[irq - wm831x->irq_base];
Mark Brown7d4d0a32009-07-27 14:45:53 +0100346}
347
Mark Brown5fb4d382009-11-11 16:10:22 +0000348static void wm831x_irq_lock(unsigned int irq)
Mark Brown7d4d0a32009-07-27 14:45:53 +0100349{
Mark Brown5fb4d382009-11-11 16:10:22 +0000350 struct wm831x *wm831x = get_irq_chip_data(irq);
Mark Brown7d4d0a32009-07-27 14:45:53 +0100351
352 mutex_lock(&wm831x->irq_lock);
Mark Brown5fb4d382009-11-11 16:10:22 +0000353}
Mark Brown7d4d0a32009-07-27 14:45:53 +0100354
Mark Brown5fb4d382009-11-11 16:10:22 +0000355static void wm831x_irq_sync_unlock(unsigned int irq)
356{
357 struct wm831x *wm831x = get_irq_chip_data(irq);
358 int i;
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 wm831x->irq_masks_cache[i] = wm831x->irq_masks_cur[i];
365 wm831x_reg_write(wm831x,
366 WM831X_INTERRUPT_STATUS_1_MASK + i,
367 wm831x->irq_masks_cur[i]);
368 }
Mark Brown7d4d0a32009-07-27 14:45:53 +0100369 }
370
Mark Brown7d4d0a32009-07-27 14:45:53 +0100371 mutex_unlock(&wm831x->irq_lock);
372}
Mark Brown7d4d0a32009-07-27 14:45:53 +0100373
Mark Brown5fb4d382009-11-11 16:10:22 +0000374static void wm831x_irq_unmask(unsigned int irq)
Mark Brown7d4d0a32009-07-27 14:45:53 +0100375{
Mark Brown5fb4d382009-11-11 16:10:22 +0000376 struct wm831x *wm831x = get_irq_chip_data(irq);
377 struct wm831x_irq_data *irq_data = irq_to_wm831x_irq(wm831x, irq);
Mark Brown7d4d0a32009-07-27 14:45:53 +0100378
Mark Brown5fb4d382009-11-11 16:10:22 +0000379 wm831x->irq_masks_cur[irq_data->reg - 1] &= ~irq_data->mask;
Mark Brown7d4d0a32009-07-27 14:45:53 +0100380}
381
Mark Brown5fb4d382009-11-11 16:10:22 +0000382static void wm831x_irq_mask(unsigned int irq)
Mark Brown7d4d0a32009-07-27 14:45:53 +0100383{
Mark Brown5fb4d382009-11-11 16:10:22 +0000384 struct wm831x *wm831x = get_irq_chip_data(irq);
385 struct wm831x_irq_data *irq_data = irq_to_wm831x_irq(wm831x, irq);
386
387 wm831x->irq_masks_cur[irq_data->reg - 1] |= irq_data->mask;
388}
389
Mark Brown896060c2010-05-07 18:39:25 +0100390static int wm831x_irq_set_type(unsigned int irq, unsigned int type)
391{
392 struct wm831x *wm831x = get_irq_chip_data(irq);
393 int val;
394
395 irq = irq - wm831x->irq_base;
396
397 if (irq < WM831X_IRQ_GPIO_1 || irq > WM831X_IRQ_GPIO_11)
398 return -EINVAL;
399
400 switch (type) {
401 case IRQ_TYPE_EDGE_BOTH:
402 val = WM831X_GPN_INT_MODE;
403 break;
404 case IRQ_TYPE_EDGE_RISING:
405 val = WM831X_GPN_POL;
406 break;
407 case IRQ_TYPE_EDGE_FALLING:
408 val = 0;
409 break;
410 default:
411 return -EINVAL;
412 }
413
414 return wm831x_set_bits(wm831x, WM831X_GPIO1_CONTROL + irq,
415 WM831X_GPN_INT_MODE | WM831X_GPN_POL, val);
416}
417
Mark Brown5fb4d382009-11-11 16:10:22 +0000418static struct irq_chip wm831x_irq_chip = {
419 .name = "wm831x",
420 .bus_lock = wm831x_irq_lock,
421 .bus_sync_unlock = wm831x_irq_sync_unlock,
422 .mask = wm831x_irq_mask,
423 .unmask = wm831x_irq_unmask,
Mark Brown896060c2010-05-07 18:39:25 +0100424 .set_type = wm831x_irq_set_type,
Mark Brown5fb4d382009-11-11 16:10:22 +0000425};
426
427/* The processing of the primary interrupt occurs in a thread so that
428 * we can interact with the device over I2C or SPI. */
429static irqreturn_t wm831x_irq_thread(int irq, void *data)
430{
431 struct wm831x *wm831x = data;
Mark Brown7d4d0a32009-07-27 14:45:53 +0100432 unsigned int i;
433 int primary;
Mark Brown5fb4d382009-11-11 16:10:22 +0000434 int status_regs[WM831X_NUM_IRQ_REGS] = { 0 };
435 int read[WM831X_NUM_IRQ_REGS] = { 0 };
Mark Brown7d4d0a32009-07-27 14:45:53 +0100436 int *status;
437
438 primary = wm831x_reg_read(wm831x, WM831X_SYSTEM_INTERRUPTS);
439 if (primary < 0) {
440 dev_err(wm831x->dev, "Failed to read system interrupt: %d\n",
441 primary);
442 goto out;
443 }
444
Mark Brown7d4d0a32009-07-27 14:45:53 +0100445 for (i = 0; i < ARRAY_SIZE(wm831x_irqs); i++) {
446 int offset = wm831x_irqs[i].reg - 1;
447
448 if (!(primary & wm831x_irqs[i].primary))
449 continue;
450
451 status = &status_regs[offset];
452
453 /* Hopefully there should only be one register to read
454 * each time otherwise we ought to do a block read. */
455 if (!read[offset]) {
456 *status = wm831x_reg_read(wm831x,
457 irq_data_to_status_reg(&wm831x_irqs[i]));
458 if (*status < 0) {
459 dev_err(wm831x->dev,
460 "Failed to read IRQ status: %d\n",
461 *status);
Mark Brown5fb4d382009-11-11 16:10:22 +0000462 goto out;
Mark Brown7d4d0a32009-07-27 14:45:53 +0100463 }
464
Mark Brown7d4d0a32009-07-27 14:45:53 +0100465 read[offset] = 1;
466 }
467
Mark Brown5fb4d382009-11-11 16:10:22 +0000468 /* Report it if it isn't masked, or forget the status. */
469 if ((*status & ~wm831x->irq_masks_cur[offset])
470 & wm831x_irqs[i].mask)
471 handle_nested_irq(wm831x->irq_base + i);
472 else
473 *status &= ~wm831x_irqs[i].mask;
Mark Brown7d4d0a32009-07-27 14:45:53 +0100474 }
475
Mark Brown7d4d0a32009-07-27 14:45:53 +0100476out:
Mark Brown5fb4d382009-11-11 16:10:22 +0000477 for (i = 0; i < ARRAY_SIZE(status_regs); i++) {
478 if (status_regs[i])
479 wm831x_reg_write(wm831x, WM831X_INTERRUPT_STATUS_1 + i,
480 status_regs[i]);
481 }
Mark Brown7d4d0a32009-07-27 14:45:53 +0100482
483 return IRQ_HANDLED;
484}
485
486int wm831x_irq_init(struct wm831x *wm831x, int irq)
487{
Mark Brown5fb4d382009-11-11 16:10:22 +0000488 struct wm831x_pdata *pdata = wm831x->dev->platform_data;
489 int i, cur_irq, ret;
Mark Brown7d4d0a32009-07-27 14:45:53 +0100490
Mark Brown14f572f2009-10-19 11:07:05 +0100491 mutex_init(&wm831x->irq_lock);
492
Mark Brown0d7e0e32010-04-05 16:14:17 +0100493 /* Mask the individual interrupt sources */
494 for (i = 0; i < ARRAY_SIZE(wm831x->irq_masks_cur); i++) {
495 wm831x->irq_masks_cur[i] = 0xffff;
496 wm831x->irq_masks_cache[i] = 0xffff;
497 wm831x_reg_write(wm831x, WM831X_INTERRUPT_STATUS_1_MASK + i,
498 0xffff);
499 }
500
Mark Brown7d4d0a32009-07-27 14:45:53 +0100501 if (!irq) {
502 dev_warn(wm831x->dev,
503 "No interrupt specified - functionality limited\n");
504 return 0;
505 }
506
Mark Brown5fb4d382009-11-11 16:10:22 +0000507 if (!pdata || !pdata->irq_base) {
508 dev_err(wm831x->dev,
509 "No interrupt base specified, no interrupts\n");
510 return 0;
Mark Brown7d4d0a32009-07-27 14:45:53 +0100511 }
512
513 wm831x->irq = irq;
Mark Brown5fb4d382009-11-11 16:10:22 +0000514 wm831x->irq_base = pdata->irq_base;
Mark Brown7d4d0a32009-07-27 14:45:53 +0100515
Mark Brown5fb4d382009-11-11 16:10:22 +0000516 /* Register them with genirq */
517 for (cur_irq = wm831x->irq_base;
518 cur_irq < ARRAY_SIZE(wm831x_irqs) + wm831x->irq_base;
519 cur_irq++) {
520 set_irq_chip_data(cur_irq, wm831x);
521 set_irq_chip_and_handler(cur_irq, &wm831x_irq_chip,
522 handle_edge_irq);
523 set_irq_nested_thread(cur_irq, 1);
Mark Brown7d4d0a32009-07-27 14:45:53 +0100524
Mark Brown5fb4d382009-11-11 16:10:22 +0000525 /* ARM needs us to explicitly flag the IRQ as valid
526 * and will set them noprobe when we do so. */
527#ifdef CONFIG_ARM
528 set_irq_flags(cur_irq, IRQF_VALID);
529#else
530 set_irq_noprobe(cur_irq);
531#endif
532 }
533
534 ret = request_threaded_irq(irq, NULL, wm831x_irq_thread,
535 IRQF_TRIGGER_LOW | IRQF_ONESHOT,
536 "wm831x", wm831x);
Mark Brown7d4d0a32009-07-27 14:45:53 +0100537 if (ret != 0) {
538 dev_err(wm831x->dev, "Failed to request IRQ %d: %d\n",
539 irq, ret);
540 return ret;
541 }
542
Mark Brown5fb4d382009-11-11 16:10:22 +0000543 /* Enable top level interrupts, we mask at secondary level */
544 wm831x_reg_write(wm831x, WM831X_SYSTEM_INTERRUPTS_MASK, 0);
545
Mark Brown7d4d0a32009-07-27 14:45:53 +0100546 return 0;
547}
548
549void wm831x_irq_exit(struct wm831x *wm831x)
550{
551 if (wm831x->irq)
552 free_irq(wm831x->irq, wm831x);
553}