[mirror_ubuntu-bionic-kernel.git] / drivers / mfd / arizona-irq.c

/*
 * Arizona interrupt support
 *
 * Copyright 2012 Wolfson Microelectronics plc
 *
 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/delay.h>
#include <linux/gpio.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/module.h>
#include <linux/pm_runtime.h>
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>

#include <linux/mfd/arizona/core.h>
#include <linux/mfd/arizona/registers.h>

#include "arizona.h"

static int arizona_map_irq(struct arizona *arizona, int irq)
{
	int ret;

	ret = regmap_irq_get_virq(arizona->aod_irq_chip, irq);
	if (ret < 0)
		ret = regmap_irq_get_virq(arizona->irq_chip, irq);

	return ret;
}

int arizona_request_irq(struct arizona *arizona, int irq, char *name,
			   irq_handler_t handler, void *data)
{
	irq = arizona_map_irq(arizona, irq);
	if (irq < 0)
		return irq;

	return request_threaded_irq(irq, NULL, handler, IRQF_ONESHOT,
				    name, data);
}
EXPORT_SYMBOL_GPL(arizona_request_irq);

void arizona_free_irq(struct arizona *arizona, int irq, void *data)
{
	irq = arizona_map_irq(arizona, irq);
	if (irq < 0)
		return;

	free_irq(irq, data);
}
EXPORT_SYMBOL_GPL(arizona_free_irq);

int arizona_set_irq_wake(struct arizona *arizona, int irq, int on)
{
	irq = arizona_map_irq(arizona, irq);
	if (irq < 0)
		return irq;

	return irq_set_irq_wake(irq, on);
}
EXPORT_SYMBOL_GPL(arizona_set_irq_wake);

static irqreturn_t arizona_boot_done(int irq, void *data)
{
	struct arizona *arizona = data;

	dev_dbg(arizona->dev, "Boot done\n");

	return IRQ_HANDLED;
}

static irqreturn_t arizona_ctrlif_err(int irq, void *data)
{
	struct arizona *arizona = data;

	/*
	 * For pretty much all potential sources a register cache sync
	 * won't help, we've just got a software bug somewhere.
	 */
	dev_err(arizona->dev, "Control interface error\n");

	return IRQ_HANDLED;
}

static irqreturn_t arizona_irq_thread(int irq, void *data)
{
	struct arizona *arizona = data;
	unsigned int val;
	int ret;

	ret = pm_runtime_get_sync(arizona->dev);
	if (ret < 0) {
		dev_err(arizona->dev, "Failed to resume device: %d\n", ret);
		return IRQ_NONE;
	}

	/* Always handle the AoD domain */
	handle_nested_irq(irq_find_mapping(arizona->virq, 0));

	/*
	 * Check if one of the main interrupts is asserted and only
	 * check that domain if it is.
	 */
	ret = regmap_read(arizona->regmap, ARIZONA_IRQ_PIN_STATUS, &val);
	if (ret == 0 && val & ARIZONA_IRQ1_STS) {
		handle_nested_irq(irq_find_mapping(arizona->virq, 1));
	} else if (ret != 0) {
		dev_err(arizona->dev, "Failed to read main IRQ status: %d\n",
			ret);
	}

	pm_runtime_mark_last_busy(arizona->dev);
	pm_runtime_put_autosuspend(arizona->dev);

	return IRQ_HANDLED;
}

static void arizona_irq_enable(struct irq_data *data)
{
}

static void arizona_irq_disable(struct irq_data *data)
{
}

static struct irq_chip arizona_irq_chip = {
	.name			= "arizona",
	.irq_disable		= arizona_irq_disable,
	.irq_enable		= arizona_irq_enable,
};

static int arizona_irq_map(struct irq_domain *h, unsigned int virq,
			      irq_hw_number_t hw)
{
	struct regmap_irq_chip_data *data = h->host_data;

	irq_set_chip_data(virq, data);
	irq_set_chip_and_handler(virq, &arizona_irq_chip, handle_edge_irq);
	irq_set_nested_thread(virq, 1);

	/* ARM needs us to explicitly flag the IRQ as valid
	 * and will set them noprobe when we do so. */
#ifdef CONFIG_ARM
	set_irq_flags(virq, IRQF_VALID);
#else
	irq_set_noprobe(virq);
#endif

	return 0;
}

static struct irq_domain_ops arizona_domain_ops = {
	.map	= arizona_irq_map,
	.xlate	= irq_domain_xlate_twocell,
};

int arizona_irq_init(struct arizona *arizona)
{
	int flags = IRQF_ONESHOT;
	int ret, i;
	const struct regmap_irq_chip *aod, *irq;
	bool ctrlif_error = true;

	switch (arizona->type) {
#ifdef CONFIG_MFD_WM5102
	case WM5102:
		aod = &wm5102_aod;
		irq = &wm5102_irq;

		ctrlif_error = false;
		break;
#endif
#ifdef CONFIG_MFD_WM5110
	case WM5110:
		aod = &wm5110_aod;
		irq = &wm5110_irq;

		ctrlif_error = false;
		break;
#endif
	default:
		BUG_ON("Unknown Arizona class device" == NULL);
		return -EINVAL;
	}

	/* Disable all wake sources by default */
	regmap_write(arizona->regmap, ARIZONA_WAKE_CONTROL, 0);

	if (arizona->pdata.irq_active_high) {
		ret = regmap_update_bits(arizona->regmap, ARIZONA_IRQ_CTRL_1,
					 ARIZONA_IRQ_POL, 0);
		if (ret != 0) {
			dev_err(arizona->dev, "Couldn't set IRQ polarity: %d\n",
				ret);
			goto err;
		}

		flags |= IRQF_TRIGGER_HIGH;
	} else {
		flags |= IRQF_TRIGGER_LOW;
	}

	/* Allocate a virtual IRQ domain to distribute to the regmap domains */
	arizona->virq = irq_domain_add_linear(NULL, 2, &arizona_domain_ops,
					      arizona);
	if (!arizona->virq) {
		dev_err(arizona->dev, "Failed to add core IRQ domain\n");
		ret = -EINVAL;
		goto err;
	}

	ret = regmap_add_irq_chip(arizona->regmap,
				  irq_create_mapping(arizona->virq, 0),
				  IRQF_ONESHOT, -1, aod,
				  &arizona->aod_irq_chip);
	if (ret != 0) {
		dev_err(arizona->dev, "Failed to add AOD IRQs: %d\n", ret);
		goto err_domain;
	}

	ret = regmap_add_irq_chip(arizona->regmap,
				  irq_create_mapping(arizona->virq, 1),
				  IRQF_ONESHOT, -1, irq,
				  &arizona->irq_chip);
	if (ret != 0) {
		dev_err(arizona->dev, "Failed to add AOD IRQs: %d\n", ret);
		goto err_aod;
	}

	/* Make sure the boot done IRQ is unmasked for resumes */
	i = arizona_map_irq(arizona, ARIZONA_IRQ_BOOT_DONE);
	ret = request_threaded_irq(i, NULL, arizona_boot_done, IRQF_ONESHOT,
				   "Boot done", arizona);
	if (ret != 0) {
		dev_err(arizona->dev, "Failed to request boot done %d: %d\n",
			arizona->irq, ret);
		goto err_boot_done;
	}

	/* Handle control interface errors in the core */
	if (ctrlif_error) {
		i = arizona_map_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR);
		ret = request_threaded_irq(i, NULL, arizona_ctrlif_err,
					   IRQF_ONESHOT,
					   "Control interface error", arizona);
		if (ret != 0) {
			dev_err(arizona->dev,
				"Failed to request CTRLIF_ERR %d: %d\n",
				arizona->irq, ret);
			goto err_ctrlif;
		}
	}

	ret = request_threaded_irq(arizona->irq, NULL, arizona_irq_thread,
				   flags, "arizona", arizona);

	if (ret != 0) {
		dev_err(arizona->dev, "Failed to request IRQ %d: %d\n",
			arizona->irq, ret);
		goto err_main_irq;
	}

	return 0;

err_main_irq:
	free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR), arizona);
err_ctrlif:
	free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_BOOT_DONE), arizona);
err_boot_done:
	regmap_del_irq_chip(irq_create_mapping(arizona->virq, 1),
			    arizona->irq_chip);
err_aod:
	regmap_del_irq_chip(irq_create_mapping(arizona->virq, 0),
			    arizona->aod_irq_chip);
err_domain:
err:
	return ret;
}

int arizona_irq_exit(struct arizona *arizona)
{
	free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR), arizona);
	free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_BOOT_DONE), arizona);
	regmap_del_irq_chip(irq_create_mapping(arizona->virq, 1),
			    arizona->irq_chip);
	regmap_del_irq_chip(irq_create_mapping(arizona->virq, 0),
			    arizona->aod_irq_chip);
	free_irq(arizona->irq, arizona);

	return 0;
}
Commit	Line	Data
966cdc96 MB	1	/*
	2	* Arizona interrupt support
	3	*
	4	* Copyright 2012 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
	9	* it under the terms of the GNU General Public License version 2 as
	10	* published by the Free Software Foundation.
	11	*/
	12
	13	#include <linux/delay.h>
	14	#include <linux/gpio.h>
	15	#include <linux/interrupt.h>
	16	#include <linux/irq.h>
	17	#include <linux/irqdomain.h>
	18	#include <linux/module.h>
	19	#include <linux/pm_runtime.h>
	20	#include <linux/regmap.h>
	21	#include <linux/regulator/consumer.h>
	22	#include <linux/slab.h>
	23
	24	#include <linux/mfd/arizona/core.h>
	25	#include <linux/mfd/arizona/registers.h>
	26
	27	#include "arizona.h"
	28
	29	static int arizona_map_irq(struct arizona *arizona, int irq)
	30	{
	31	int ret;
	32
	33	ret = regmap_irq_get_virq(arizona->aod_irq_chip, irq);
	34	if (ret < 0)
	35	ret = regmap_irq_get_virq(arizona->irq_chip, irq);
	36
	37	return ret;
	38	}
	39
	40	int arizona_request_irq(struct arizona arizona, int irq, char name,
	41	irq_handler_t handler, void *data)
	42	{
	43	irq = arizona_map_irq(arizona, irq);
	44	if (irq < 0)
	45	return irq;
	46
	47	return request_threaded_irq(irq, NULL, handler, IRQF_ONESHOT,
	48	name, data);
	49	}
	50	EXPORT_SYMBOL_GPL(arizona_request_irq);
	51
	52	void arizona_free_irq(struct arizona arizona, int irq, void data)
	53	{
	54	irq = arizona_map_irq(arizona, irq);
	55	if (irq < 0)
	56	return;
	57
	58	free_irq(irq, data);
	59	}
	60	EXPORT_SYMBOL_GPL(arizona_free_irq);
	61
	62	int arizona_set_irq_wake(struct arizona *arizona, int irq, int on)
	63	{
	64	irq = arizona_map_irq(arizona, irq);
65	if (irq < 0)
66	return irq;
67
68	return irq_set_irq_wake(irq, on);
69	}
70	EXPORT_SYMBOL_GPL(arizona_set_irq_wake);
71
72	static irqreturn_t arizona_boot_done(int irq, void *data)
73	{
74	struct arizona *arizona = data;
75
76	dev_dbg(arizona->dev, "Boot done\n");
77
78	return IRQ_HANDLED;
79	}
80
81	static irqreturn_t arizona_ctrlif_err(int irq, void *data)
82	{
83	struct arizona *arizona = data;
84
85	/*
86	* For pretty much all potential sources a register cache sync
87	* won't help, we've just got a software bug somewhere.
88	*/
89	dev_err(arizona->dev, "Control interface error\n");
90
91	return IRQ_HANDLED;
92	}
93
94	static irqreturn_t arizona_irq_thread(int irq, void *data)
95	{
96	struct arizona *arizona = data;
3080de4e	97	unsigned int val;
cdabc1c8	98	int ret;
966cdc96 MB	99
	100	ret = pm_runtime_get_sync(arizona->dev);
	101	if (ret < 0) {
	102	dev_err(arizona->dev, "Failed to resume device: %d\n", ret);
	103	return IRQ_NONE;
	104	}
	105
3080de4e MB	106	/* Always handle the AoD domain */
	107	handle_nested_irq(irq_find_mapping(arizona->virq, 0));
	108
	109	/*
	110	* Check if one of the main interrupts is asserted and only
	111	* check that domain if it is.
	112	*/
	113	ret = regmap_read(arizona->regmap, ARIZONA_IRQ_PIN_STATUS, &val);
	114	if (ret == 0 && val & ARIZONA_IRQ1_STS) {
	115	handle_nested_irq(irq_find_mapping(arizona->virq, 1));
	116	} else if (ret != 0) {
	117	dev_err(arizona->dev, "Failed to read main IRQ status: %d\n",
	118	ret);
	119	}
966cdc96 MB	120
	121	pm_runtime_mark_last_busy(arizona->dev);
	122	pm_runtime_put_autosuspend(arizona->dev);
	123
	124	return IRQ_HANDLED;
	125	}
	126
	127	static void arizona_irq_enable(struct irq_data *data)
	128	{
	129	}
	130
	131	static void arizona_irq_disable(struct irq_data *data)
	132	{
	133	}
	134
	135	static struct irq_chip arizona_irq_chip = {
	136	.name = "arizona",
	137	.irq_disable = arizona_irq_disable,
	138	.irq_enable = arizona_irq_enable,
	139	};
	140
	141	static int arizona_irq_map(struct irq_domain *h, unsigned int virq,
	142	irq_hw_number_t hw)
	143	{
	144	struct regmap_irq_chip_data *data = h->host_data;
	145
	146	irq_set_chip_data(virq, data);
	147	irq_set_chip_and_handler(virq, &arizona_irq_chip, handle_edge_irq);
	148	irq_set_nested_thread(virq, 1);
	149
	150	/* ARM needs us to explicitly flag the IRQ as valid
	151	* and will set them noprobe when we do so. */
	152	#ifdef CONFIG_ARM
	153	set_irq_flags(virq, IRQF_VALID);
	154	#else
	155	irq_set_noprobe(virq);
	156	#endif
	157
	158	return 0;
	159	}
	160
	161	static struct irq_domain_ops arizona_domain_ops = {
	162	.map = arizona_irq_map,
	163	.xlate = irq_domain_xlate_twocell,
	164	};
	165
	166	int arizona_irq_init(struct arizona *arizona)
	167	{
	168	int flags = IRQF_ONESHOT;
	169	int ret, i;
	170	const struct regmap_irq_chip aod, irq;
92d80139	171	bool ctrlif_error = true;
966cdc96 MB	172
966cdc96 MB	173	switch (arizona->type) {
863df8d5	174	#ifdef CONFIG_MFD_WM5102
966cdc96 MB	175	case WM5102:
	176	aod = &wm5102_aod;
	177	irq = &wm5102_irq;
92d80139	178
e1bfe75d	179	ctrlif_error = false;
966cdc96	180	break;
e102befe MB	181	#endif
	182	#ifdef CONFIG_MFD_WM5110
	183	case WM5110:
	184	aod = &wm5110_aod;
	185	irq = &wm5110_irq;
92d80139	186
e1bfe75d	187	ctrlif_error = false;
e102befe	188	break;
863df8d5	189	#endif
966cdc96 MB	190	default:
	191	BUG_ON("Unknown Arizona class device" == NULL);
	192	return -EINVAL;
	193	}
	194
1816cb34 MB	195	/* Disable all wake sources by default */
	196	regmap_write(arizona->regmap, ARIZONA_WAKE_CONTROL, 0);
	197
966cdc96 MB	198	if (arizona->pdata.irq_active_high) {
	199	ret = regmap_update_bits(arizona->regmap, ARIZONA_IRQ_CTRL_1,
	200	ARIZONA_IRQ_POL, 0);
	201	if (ret != 0) {
	202	dev_err(arizona->dev, "Couldn't set IRQ polarity: %d\n",
	203	ret);
	204	goto err;
	205	}
	206
	207	flags \|= IRQF_TRIGGER_HIGH;
	208	} else {
	209	flags \|= IRQF_TRIGGER_LOW;
	210	}
	211
	212	/* Allocate a virtual IRQ domain to distribute to the regmap domains */
	213	arizona->virq = irq_domain_add_linear(NULL, 2, &arizona_domain_ops,
	214	arizona);
	215	if (!arizona->virq) {
b7dea5dc	216	dev_err(arizona->dev, "Failed to add core IRQ domain\n");
966cdc96 MB	217	ret = -EINVAL;
	218	goto err;
	219	}
	220
	221	ret = regmap_add_irq_chip(arizona->regmap,
	222	irq_create_mapping(arizona->virq, 0),
	223	IRQF_ONESHOT, -1, aod,
	224	&arizona->aod_irq_chip);
	225	if (ret != 0) {
	226	dev_err(arizona->dev, "Failed to add AOD IRQs: %d\n", ret);
	227	goto err_domain;
	228	}
	229
	230	ret = regmap_add_irq_chip(arizona->regmap,
	231	irq_create_mapping(arizona->virq, 1),
	232	IRQF_ONESHOT, -1, irq,
	233	&arizona->irq_chip);
	234	if (ret != 0) {
	235	dev_err(arizona->dev, "Failed to add AOD IRQs: %d\n", ret);
	236	goto err_aod;
	237	}
	238
	239	/* Make sure the boot done IRQ is unmasked for resumes */
	240	i = arizona_map_irq(arizona, ARIZONA_IRQ_BOOT_DONE);
	241	ret = request_threaded_irq(i, NULL, arizona_boot_done, IRQF_ONESHOT,
	242	"Boot done", arizona);
	243	if (ret != 0) {
	244	dev_err(arizona->dev, "Failed to request boot done %d: %d\n",
	245	arizona->irq, ret);
	246	goto err_boot_done;
	247	}
	248
	249	/* Handle control interface errors in the core */
92d80139 MB	250	if (ctrlif_error) {
	251	i = arizona_map_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR);
	252	ret = request_threaded_irq(i, NULL, arizona_ctrlif_err,
	253	IRQF_ONESHOT,
	254	"Control interface error", arizona);
	255	if (ret != 0) {
	256	dev_err(arizona->dev,
	257	"Failed to request CTRLIF_ERR %d: %d\n",
	258	arizona->irq, ret);
	259	goto err_ctrlif;
	260	}
966cdc96 MB	261	}
	262
	263	ret = request_threaded_irq(arizona->irq, NULL, arizona_irq_thread,
	264	flags, "arizona", arizona);
	265
	266	if (ret != 0) {
	267	dev_err(arizona->dev, "Failed to request IRQ %d: %d\n",
	268	arizona->irq, ret);
	269	goto err_main_irq;
	270	}
	271
	272	return 0;
	273
	274	err_main_irq:
	275	free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR), arizona);
	276	err_ctrlif:
	277	free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_BOOT_DONE), arizona);
	278	err_boot_done:
	279	regmap_del_irq_chip(irq_create_mapping(arizona->virq, 1),
	280	arizona->irq_chip);
	281	err_aod:
	282	regmap_del_irq_chip(irq_create_mapping(arizona->virq, 0),
	283	arizona->aod_irq_chip);
	284	err_domain:
	285	err:
	286	return ret;
	287	}
	288
	289	int arizona_irq_exit(struct arizona *arizona)
	290	{
	291	free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR), arizona);
	292	free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_BOOT_DONE), arizona);
	293	regmap_del_irq_chip(irq_create_mapping(arizona->virq, 1),
	294	arizona->irq_chip);
	295	regmap_del_irq_chip(irq_create_mapping(arizona->virq, 0),
	296	arizona->aod_irq_chip);
	297	free_irq(arizona->irq, arizona);
	298
	299	return 0;
	300	}