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/bug.h>
18#include <linux/device.h>
19#include <linux/interrupt.h>
20#include <linux/irq.h>
21
22#include <linux/mfd/wm8350/core.h>
23#include <linux/mfd/wm8350/audio.h>
24#include <linux/mfd/wm8350/comparator.h>
25#include <linux/mfd/wm8350/gpio.h>
26#include <linux/mfd/wm8350/pmic.h>
27#include <linux/mfd/wm8350/rtc.h>
28#include <linux/mfd/wm8350/supply.h>
29#include <linux/mfd/wm8350/wdt.h>
30
31#define WM8350_INT_OFFSET_1                     0
32#define WM8350_INT_OFFSET_2                     1
33#define WM8350_POWER_UP_INT_OFFSET              2
34#define WM8350_UNDER_VOLTAGE_INT_OFFSET         3
35#define WM8350_OVER_CURRENT_INT_OFFSET          4
36#define WM8350_GPIO_INT_OFFSET                  5
37#define WM8350_COMPARATOR_INT_OFFSET            6
38
39struct wm8350_irq_data {
40	int primary;
41	int reg;
42	int mask;
43	int primary_only;
44};
45
46static struct wm8350_irq_data wm8350_irqs[] = {
47	[WM8350_IRQ_OC_LS] = {
48		.primary = WM8350_OC_INT,
49		.reg = WM8350_OVER_CURRENT_INT_OFFSET,
50		.mask = WM8350_OC_LS_EINT,
51		.primary_only = 1,
52	},
53	[WM8350_IRQ_UV_DC1] = {
54		.primary = WM8350_UV_INT,
55		.reg = WM8350_UNDER_VOLTAGE_INT_OFFSET,
56		.mask = WM8350_UV_DC1_EINT,
57	},
58	[WM8350_IRQ_UV_DC2] = {
59		.primary = WM8350_UV_INT,
60		.reg = WM8350_UNDER_VOLTAGE_INT_OFFSET,
61		.mask = WM8350_UV_DC2_EINT,
62	},
63	[WM8350_IRQ_UV_DC3] = {
64		.primary = WM8350_UV_INT,
65		.reg = WM8350_UNDER_VOLTAGE_INT_OFFSET,
66		.mask = WM8350_UV_DC3_EINT,
67	},
68	[WM8350_IRQ_UV_DC4] = {
69		.primary = WM8350_UV_INT,
70		.reg = WM8350_UNDER_VOLTAGE_INT_OFFSET,
71		.mask = WM8350_UV_DC4_EINT,
72	},
73	[WM8350_IRQ_UV_DC5] = {
74		.primary = WM8350_UV_INT,
75		.reg = WM8350_UNDER_VOLTAGE_INT_OFFSET,
76		.mask = WM8350_UV_DC5_EINT,
77	},
78	[WM8350_IRQ_UV_DC6] = {
79		.primary = WM8350_UV_INT,
80		.reg = WM8350_UNDER_VOLTAGE_INT_OFFSET,
81		.mask = WM8350_UV_DC6_EINT,
82	},
83	[WM8350_IRQ_UV_LDO1] = {
84		.primary = WM8350_UV_INT,
85		.reg = WM8350_UNDER_VOLTAGE_INT_OFFSET,
86		.mask = WM8350_UV_LDO1_EINT,
87	},
88	[WM8350_IRQ_UV_LDO2] = {
89		.primary = WM8350_UV_INT,
90		.reg = WM8350_UNDER_VOLTAGE_INT_OFFSET,
91		.mask = WM8350_UV_LDO2_EINT,
92	},
93	[WM8350_IRQ_UV_LDO3] = {
94		.primary = WM8350_UV_INT,
95		.reg = WM8350_UNDER_VOLTAGE_INT_OFFSET,
96		.mask = WM8350_UV_LDO3_EINT,
97	},
98	[WM8350_IRQ_UV_LDO4] = {
99		.primary = WM8350_UV_INT,
100		.reg = WM8350_UNDER_VOLTAGE_INT_OFFSET,
101		.mask = WM8350_UV_LDO4_EINT,
102	},
103	[WM8350_IRQ_CHG_BAT_HOT] = {
104		.primary = WM8350_CHG_INT,
105		.reg = WM8350_INT_OFFSET_1,
106		.mask = WM8350_CHG_BAT_HOT_EINT,
107	},
108	[WM8350_IRQ_CHG_BAT_COLD] = {
109		.primary = WM8350_CHG_INT,
110		.reg = WM8350_INT_OFFSET_1,
111		.mask = WM8350_CHG_BAT_COLD_EINT,
112	},
113	[WM8350_IRQ_CHG_BAT_FAIL] = {
114		.primary = WM8350_CHG_INT,
115		.reg = WM8350_INT_OFFSET_1,
116		.mask = WM8350_CHG_BAT_FAIL_EINT,
117	},
118	[WM8350_IRQ_CHG_TO] = {
119		.primary = WM8350_CHG_INT,
120		.reg = WM8350_INT_OFFSET_1,
121		.mask = WM8350_CHG_TO_EINT,
122	},
123	[WM8350_IRQ_CHG_END] = {
124		.primary = WM8350_CHG_INT,
125		.reg = WM8350_INT_OFFSET_1,
126		.mask = WM8350_CHG_END_EINT,
127	},
128	[WM8350_IRQ_CHG_START] = {
129		.primary = WM8350_CHG_INT,
130		.reg = WM8350_INT_OFFSET_1,
131		.mask = WM8350_CHG_START_EINT,
132	},
133	[WM8350_IRQ_CHG_FAST_RDY] = {
134		.primary = WM8350_CHG_INT,
135		.reg = WM8350_INT_OFFSET_1,
136		.mask = WM8350_CHG_FAST_RDY_EINT,
137	},
138	[WM8350_IRQ_CHG_VBATT_LT_3P9] = {
139		.primary = WM8350_CHG_INT,
140		.reg = WM8350_INT_OFFSET_1,
141		.mask = WM8350_CHG_VBATT_LT_3P9_EINT,
142	},
143	[WM8350_IRQ_CHG_VBATT_LT_3P1] = {
144		.primary = WM8350_CHG_INT,
145		.reg = WM8350_INT_OFFSET_1,
146		.mask = WM8350_CHG_VBATT_LT_3P1_EINT,
147	},
148	[WM8350_IRQ_CHG_VBATT_LT_2P85] = {
149		.primary = WM8350_CHG_INT,
150		.reg = WM8350_INT_OFFSET_1,
151		.mask = WM8350_CHG_VBATT_LT_2P85_EINT,
152	},
153	[WM8350_IRQ_RTC_ALM] = {
154		.primary = WM8350_RTC_INT,
155		.reg = WM8350_INT_OFFSET_1,
156		.mask = WM8350_RTC_ALM_EINT,
157	},
158	[WM8350_IRQ_RTC_SEC] = {
159		.primary = WM8350_RTC_INT,
160		.reg = WM8350_INT_OFFSET_1,
161		.mask = WM8350_RTC_SEC_EINT,
162	},
163	[WM8350_IRQ_RTC_PER] = {
164		.primary = WM8350_RTC_INT,
165		.reg = WM8350_INT_OFFSET_1,
166		.mask = WM8350_RTC_PER_EINT,
167	},
168	[WM8350_IRQ_CS1] = {
169		.primary = WM8350_CS_INT,
170		.reg = WM8350_INT_OFFSET_2,
171		.mask = WM8350_CS1_EINT,
172	},
173	[WM8350_IRQ_CS2] = {
174		.primary = WM8350_CS_INT,
175		.reg = WM8350_INT_OFFSET_2,
176		.mask = WM8350_CS2_EINT,
177	},
178	[WM8350_IRQ_SYS_HYST_COMP_FAIL] = {
179		.primary = WM8350_SYS_INT,
180		.reg = WM8350_INT_OFFSET_2,
181		.mask = WM8350_SYS_HYST_COMP_FAIL_EINT,
182	},
183	[WM8350_IRQ_SYS_CHIP_GT115] = {
184		.primary = WM8350_SYS_INT,
185		.reg = WM8350_INT_OFFSET_2,
186		.mask = WM8350_SYS_CHIP_GT115_EINT,
187	},
188	[WM8350_IRQ_SYS_CHIP_GT140] = {
189		.primary = WM8350_SYS_INT,
190		.reg = WM8350_INT_OFFSET_2,
191		.mask = WM8350_SYS_CHIP_GT140_EINT,
192	},
193	[WM8350_IRQ_SYS_WDOG_TO] = {
194		.primary = WM8350_SYS_INT,
195		.reg = WM8350_INT_OFFSET_2,
196		.mask = WM8350_SYS_WDOG_TO_EINT,
197	},
198	[WM8350_IRQ_AUXADC_DATARDY] = {
199		.primary = WM8350_AUXADC_INT,
200		.reg = WM8350_INT_OFFSET_2,
201		.mask = WM8350_AUXADC_DATARDY_EINT,
202	},
203	[WM8350_IRQ_AUXADC_DCOMP4] = {
204		.primary = WM8350_AUXADC_INT,
205		.reg = WM8350_INT_OFFSET_2,
206		.mask = WM8350_AUXADC_DCOMP4_EINT,
207	},
208	[WM8350_IRQ_AUXADC_DCOMP3] = {
209		.primary = WM8350_AUXADC_INT,
210		.reg = WM8350_INT_OFFSET_2,
211		.mask = WM8350_AUXADC_DCOMP3_EINT,
212	},
213	[WM8350_IRQ_AUXADC_DCOMP2] = {
214		.primary = WM8350_AUXADC_INT,
215		.reg = WM8350_INT_OFFSET_2,
216		.mask = WM8350_AUXADC_DCOMP2_EINT,
217	},
218	[WM8350_IRQ_AUXADC_DCOMP1] = {
219		.primary = WM8350_AUXADC_INT,
220		.reg = WM8350_INT_OFFSET_2,
221		.mask = WM8350_AUXADC_DCOMP1_EINT,
222	},
223	[WM8350_IRQ_USB_LIMIT] = {
224		.primary = WM8350_USB_INT,
225		.reg = WM8350_INT_OFFSET_2,
226		.mask = WM8350_USB_LIMIT_EINT,
227		.primary_only = 1,
228	},
229	[WM8350_IRQ_WKUP_OFF_STATE] = {
230		.primary = WM8350_WKUP_INT,
231		.reg = WM8350_COMPARATOR_INT_OFFSET,
232		.mask = WM8350_WKUP_OFF_STATE_EINT,
233	},
234	[WM8350_IRQ_WKUP_HIB_STATE] = {
235		.primary = WM8350_WKUP_INT,
236		.reg = WM8350_COMPARATOR_INT_OFFSET,
237		.mask = WM8350_WKUP_HIB_STATE_EINT,
238	},
239	[WM8350_IRQ_WKUP_CONV_FAULT] = {
240		.primary = WM8350_WKUP_INT,
241		.reg = WM8350_COMPARATOR_INT_OFFSET,
242		.mask = WM8350_WKUP_CONV_FAULT_EINT,
243	},
244	[WM8350_IRQ_WKUP_WDOG_RST] = {
245		.primary = WM8350_WKUP_INT,
246		.reg = WM8350_COMPARATOR_INT_OFFSET,
247		.mask = WM8350_WKUP_WDOG_RST_EINT,
248	},
249	[WM8350_IRQ_WKUP_GP_PWR_ON] = {
250		.primary = WM8350_WKUP_INT,
251		.reg = WM8350_COMPARATOR_INT_OFFSET,
252		.mask = WM8350_WKUP_GP_PWR_ON_EINT,
253	},
254	[WM8350_IRQ_WKUP_ONKEY] = {
255		.primary = WM8350_WKUP_INT,
256		.reg = WM8350_COMPARATOR_INT_OFFSET,
257		.mask = WM8350_WKUP_ONKEY_EINT,
258	},
259	[WM8350_IRQ_WKUP_GP_WAKEUP] = {
260		.primary = WM8350_WKUP_INT,
261		.reg = WM8350_COMPARATOR_INT_OFFSET,
262		.mask = WM8350_WKUP_GP_WAKEUP_EINT,
263	},
264	[WM8350_IRQ_CODEC_JCK_DET_L] = {
265		.primary = WM8350_CODEC_INT,
266		.reg = WM8350_COMPARATOR_INT_OFFSET,
267		.mask = WM8350_CODEC_JCK_DET_L_EINT,
268	},
269	[WM8350_IRQ_CODEC_JCK_DET_R] = {
270		.primary = WM8350_CODEC_INT,
271		.reg = WM8350_COMPARATOR_INT_OFFSET,
272		.mask = WM8350_CODEC_JCK_DET_R_EINT,
273	},
274	[WM8350_IRQ_CODEC_MICSCD] = {
275		.primary = WM8350_CODEC_INT,
276		.reg = WM8350_COMPARATOR_INT_OFFSET,
277		.mask = WM8350_CODEC_MICSCD_EINT,
278	},
279	[WM8350_IRQ_CODEC_MICD] = {
280		.primary = WM8350_CODEC_INT,
281		.reg = WM8350_COMPARATOR_INT_OFFSET,
282		.mask = WM8350_CODEC_MICD_EINT,
283	},
284	[WM8350_IRQ_EXT_USB_FB] = {
285		.primary = WM8350_EXT_INT,
286		.reg = WM8350_COMPARATOR_INT_OFFSET,
287		.mask = WM8350_EXT_USB_FB_EINT,
288	},
289	[WM8350_IRQ_EXT_WALL_FB] = {
290		.primary = WM8350_EXT_INT,
291		.reg = WM8350_COMPARATOR_INT_OFFSET,
292		.mask = WM8350_EXT_WALL_FB_EINT,
293	},
294	[WM8350_IRQ_EXT_BAT_FB] = {
295		.primary = WM8350_EXT_INT,
296		.reg = WM8350_COMPARATOR_INT_OFFSET,
297		.mask = WM8350_EXT_BAT_FB_EINT,
298	},
299	[WM8350_IRQ_GPIO(0)] = {
300		.primary = WM8350_GP_INT,
301		.reg = WM8350_GPIO_INT_OFFSET,
302		.mask = WM8350_GP0_EINT,
303	},
304	[WM8350_IRQ_GPIO(1)] = {
305		.primary = WM8350_GP_INT,
306		.reg = WM8350_GPIO_INT_OFFSET,
307		.mask = WM8350_GP1_EINT,
308	},
309	[WM8350_IRQ_GPIO(2)] = {
310		.primary = WM8350_GP_INT,
311		.reg = WM8350_GPIO_INT_OFFSET,
312		.mask = WM8350_GP2_EINT,
313	},
314	[WM8350_IRQ_GPIO(3)] = {
315		.primary = WM8350_GP_INT,
316		.reg = WM8350_GPIO_INT_OFFSET,
317		.mask = WM8350_GP3_EINT,
318	},
319	[WM8350_IRQ_GPIO(4)] = {
320		.primary = WM8350_GP_INT,
321		.reg = WM8350_GPIO_INT_OFFSET,
322		.mask = WM8350_GP4_EINT,
323	},
324	[WM8350_IRQ_GPIO(5)] = {
325		.primary = WM8350_GP_INT,
326		.reg = WM8350_GPIO_INT_OFFSET,
327		.mask = WM8350_GP5_EINT,
328	},
329	[WM8350_IRQ_GPIO(6)] = {
330		.primary = WM8350_GP_INT,
331		.reg = WM8350_GPIO_INT_OFFSET,
332		.mask = WM8350_GP6_EINT,
333	},
334	[WM8350_IRQ_GPIO(7)] = {
335		.primary = WM8350_GP_INT,
336		.reg = WM8350_GPIO_INT_OFFSET,
337		.mask = WM8350_GP7_EINT,
338	},
339	[WM8350_IRQ_GPIO(8)] = {
340		.primary = WM8350_GP_INT,
341		.reg = WM8350_GPIO_INT_OFFSET,
342		.mask = WM8350_GP8_EINT,
343	},
344	[WM8350_IRQ_GPIO(9)] = {
345		.primary = WM8350_GP_INT,
346		.reg = WM8350_GPIO_INT_OFFSET,
347		.mask = WM8350_GP9_EINT,
348	},
349	[WM8350_IRQ_GPIO(10)] = {
350		.primary = WM8350_GP_INT,
351		.reg = WM8350_GPIO_INT_OFFSET,
352		.mask = WM8350_GP10_EINT,
353	},
354	[WM8350_IRQ_GPIO(11)] = {
355		.primary = WM8350_GP_INT,
356		.reg = WM8350_GPIO_INT_OFFSET,
357		.mask = WM8350_GP11_EINT,
358	},
359	[WM8350_IRQ_GPIO(12)] = {
360		.primary = WM8350_GP_INT,
361		.reg = WM8350_GPIO_INT_OFFSET,
362		.mask = WM8350_GP12_EINT,
363	},
364};
365
366static inline struct wm8350_irq_data *irq_to_wm8350_irq(struct wm8350 *wm8350,
367							int irq)
368{
369	return &wm8350_irqs[irq - wm8350->irq_base];
370}
371
372/*
373 * This is a threaded IRQ handler so can access I2C/SPI.  Since all
374 * interrupts are clear on read the IRQ line will be reasserted and
375 * the physical IRQ will be handled again if another interrupt is
376 * asserted while we run - in the normal course of events this is a
377 * rare occurrence so we save I2C/SPI reads.  We're also assuming that
378 * it's rare to get lots of interrupts firing simultaneously so try to
379 * minimise I/O.
380 */
381static irqreturn_t wm8350_irq(int irq, void *irq_data)
382{
383	struct wm8350 *wm8350 = irq_data;
384	u16 level_one;
385	u16 sub_reg[WM8350_NUM_IRQ_REGS];
386	int read_done[WM8350_NUM_IRQ_REGS];
387	struct wm8350_irq_data *data;
388	int i;
389
390	level_one = wm8350_reg_read(wm8350, WM8350_SYSTEM_INTERRUPTS)
391		& ~wm8350_reg_read(wm8350, WM8350_SYSTEM_INTERRUPTS_MASK);
392
393	if (!level_one)
394		return IRQ_NONE;
395
396	memset(&read_done, 0, sizeof(read_done));
397
398	for (i = 0; i < ARRAY_SIZE(wm8350_irqs); i++) {
399		data = &wm8350_irqs[i];
400
401		if (!(level_one & data->primary))
402			continue;
403
404		if (!read_done[data->reg]) {
405			sub_reg[data->reg] =
406				wm8350_reg_read(wm8350, WM8350_INT_STATUS_1 +
407						data->reg);
408			sub_reg[data->reg] &= ~wm8350->irq_masks[data->reg];
409			read_done[data->reg] = 1;
410		}
411
412		if (sub_reg[data->reg] & data->mask)
413			handle_nested_irq(wm8350->irq_base + i);
414	}
415
416	return IRQ_HANDLED;
417}
418
419static void wm8350_irq_lock(struct irq_data *data)
420{
421	struct wm8350 *wm8350 = irq_data_get_irq_chip_data(data);
422
423	mutex_lock(&wm8350->irq_lock);
424}
425
426static void wm8350_irq_sync_unlock(struct irq_data *data)
427{
428	struct wm8350 *wm8350 = irq_data_get_irq_chip_data(data);
429	int i;
430
431	for (i = 0; i < ARRAY_SIZE(wm8350->irq_masks); i++) {
432		/* If there's been a change in the mask write it back
433		 * to the hardware. */
434		WARN_ON(regmap_update_bits(wm8350->regmap,
435					   WM8350_INT_STATUS_1_MASK + i,
436					   0xffff, wm8350->irq_masks[i]));
437	}
438
439	mutex_unlock(&wm8350->irq_lock);
440}
441
442static void wm8350_irq_enable(struct irq_data *data)
443{
444	struct wm8350 *wm8350 = irq_data_get_irq_chip_data(data);
445	struct wm8350_irq_data *irq_data = irq_to_wm8350_irq(wm8350,
446							     data->irq);
447
448	wm8350->irq_masks[irq_data->reg] &= ~irq_data->mask;
449}
450
451static void wm8350_irq_disable(struct irq_data *data)
452{
453	struct wm8350 *wm8350 = irq_data_get_irq_chip_data(data);
454	struct wm8350_irq_data *irq_data = irq_to_wm8350_irq(wm8350,
455							     data->irq);
456
457	wm8350->irq_masks[irq_data->reg] |= irq_data->mask;
458}
459
460static struct irq_chip wm8350_irq_chip = {
461	.name			= "wm8350",
462	.irq_bus_lock		= wm8350_irq_lock,
463	.irq_bus_sync_unlock	= wm8350_irq_sync_unlock,
464	.irq_disable		= wm8350_irq_disable,
465	.irq_enable		= wm8350_irq_enable,
466};
467
468int wm8350_irq_init(struct wm8350 *wm8350, int irq,
469		    struct wm8350_platform_data *pdata)
470{
471	int ret, cur_irq, i;
472	int flags = IRQF_ONESHOT;
473	int irq_base = -1;
474
475	if (!irq) {
476		dev_warn(wm8350->dev, "No interrupt support, no core IRQ\n");
477		return 0;
478	}
479
480	/* Mask top level interrupts */
481	wm8350_reg_write(wm8350, WM8350_SYSTEM_INTERRUPTS_MASK, 0xFFFF);
482
483	/* Mask all individual interrupts by default and cache the
484	 * masks.  We read the masks back since there are unwritable
485	 * bits in the mask registers. */
486	for (i = 0; i < ARRAY_SIZE(wm8350->irq_masks); i++) {
487		wm8350_reg_write(wm8350, WM8350_INT_STATUS_1_MASK + i,
488				 0xFFFF);
489		wm8350->irq_masks[i] =
490			wm8350_reg_read(wm8350,
491					WM8350_INT_STATUS_1_MASK + i);
492	}
493
494	mutex_init(&wm8350->irq_lock);
495	wm8350->chip_irq = irq;
496
497	if (pdata && pdata->irq_base > 0)
498		irq_base = pdata->irq_base;
499
500	wm8350->irq_base =
501		irq_alloc_descs(irq_base, 0, ARRAY_SIZE(wm8350_irqs), 0);
502	if (wm8350->irq_base < 0) {
503		dev_warn(wm8350->dev, "Allocating irqs failed with %d\n",
504			wm8350->irq_base);
505		return 0;
506	}
507
508	if (pdata && pdata->irq_high) {
509		flags |= IRQF_TRIGGER_HIGH;
510
511		wm8350_set_bits(wm8350, WM8350_SYSTEM_CONTROL_1,
512				WM8350_IRQ_POL);
513	} else {
514		flags |= IRQF_TRIGGER_LOW;
515
516		wm8350_clear_bits(wm8350, WM8350_SYSTEM_CONTROL_1,
517				  WM8350_IRQ_POL);
518	}
519
520	/* Register with genirq */
521	for (cur_irq = wm8350->irq_base;
522	     cur_irq < ARRAY_SIZE(wm8350_irqs) + wm8350->irq_base;
523	     cur_irq++) {
524		irq_set_chip_data(cur_irq, wm8350);
525		irq_set_chip_and_handler(cur_irq, &wm8350_irq_chip,
526					 handle_edge_irq);
527		irq_set_nested_thread(cur_irq, 1);
528
529		/* ARM needs us to explicitly flag the IRQ as valid
530		 * and will set them noprobe when we do so. */
531#ifdef CONFIG_ARM
532		set_irq_flags(cur_irq, IRQF_VALID);
533#else
534		irq_set_noprobe(cur_irq);
535#endif
536	}
537
538	ret = request_threaded_irq(irq, NULL, wm8350_irq, flags,
539				   "wm8350", wm8350);
540	if (ret != 0)
541		dev_err(wm8350->dev, "Failed to request IRQ: %d\n", ret);
542
543	/* Allow interrupts to fire */
544	wm8350_reg_write(wm8350, WM8350_SYSTEM_INTERRUPTS_MASK, 0);
545
546	return ret;
547}
548
549int wm8350_irq_exit(struct wm8350 *wm8350)
550{
551	free_irq(wm8350->chip_irq, wm8350);
552	return 0;
553}
554