[linux.git] / drivers / irqchip / irq-st.c

/*
 *  Copyright (C) 2014 STMicroelectronics – All Rights Reserved
 *
 *  Author: Lee Jones <[email protected]>
 *
 *  This is a re-write of Christophe Kerello's PMU driver.
 *
 * 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 <dt-bindings/interrupt-controller/irq-st.h>
#include <linux/err.h>
#include <linux/mfd/syscon.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/slab.h>

#define STIH415_SYSCFG_642		0x0a8
#define STIH416_SYSCFG_7543		0x87c
#define STIH407_SYSCFG_5102		0x198
#define STID127_SYSCFG_734		0x088

#define ST_A9_IRQ_MASK			0x001FFFFF
#define ST_A9_IRQ_MAX_CHANS		2

#define ST_A9_IRQ_EN_CTI_0		BIT(0)
#define ST_A9_IRQ_EN_CTI_1		BIT(1)
#define ST_A9_IRQ_EN_PMU_0		BIT(2)
#define ST_A9_IRQ_EN_PMU_1		BIT(3)
#define ST_A9_IRQ_EN_PL310_L2		BIT(4)
#define ST_A9_IRQ_EN_EXT_0		BIT(5)
#define ST_A9_IRQ_EN_EXT_1		BIT(6)
#define ST_A9_IRQ_EN_EXT_2		BIT(7)

#define ST_A9_FIQ_N_SEL(dev, chan)	(dev << (8  + (chan * 3)))
#define ST_A9_IRQ_N_SEL(dev, chan)	(dev << (14 + (chan * 3)))
#define ST_A9_EXTIRQ_INV_SEL(dev)	(dev << 20)

struct st_irq_syscfg {
	struct regmap *regmap;
	unsigned int syscfg;
	unsigned int config;
	bool ext_inverted;
};

static const struct of_device_id st_irq_syscfg_match[] = {
	{
		.compatible = "st,stih415-irq-syscfg",
		.data = (void *)STIH415_SYSCFG_642,
	},
	{
		.compatible = "st,stih416-irq-syscfg",
		.data = (void *)STIH416_SYSCFG_7543,
	},
	{
		.compatible = "st,stih407-irq-syscfg",
		.data = (void *)STIH407_SYSCFG_5102,
	},
	{
		.compatible = "st,stid127-irq-syscfg",
		.data = (void *)STID127_SYSCFG_734,
	},
	{}
};

static int st_irq_xlate(struct platform_device *pdev,
			int device, int channel, bool irq)
{
	struct st_irq_syscfg *ddata = dev_get_drvdata(&pdev->dev);

	/* Set the device enable bit. */
	switch (device) {
	case ST_IRQ_SYSCFG_EXT_0:
		ddata->config |= ST_A9_IRQ_EN_EXT_0;
		break;
	case ST_IRQ_SYSCFG_EXT_1:
		ddata->config |= ST_A9_IRQ_EN_EXT_1;
		break;
	case ST_IRQ_SYSCFG_EXT_2:
		ddata->config |= ST_A9_IRQ_EN_EXT_2;
		break;
	case ST_IRQ_SYSCFG_CTI_0:
		ddata->config |= ST_A9_IRQ_EN_CTI_0;
		break;
	case ST_IRQ_SYSCFG_CTI_1:
		ddata->config |= ST_A9_IRQ_EN_CTI_1;
		break;
	case ST_IRQ_SYSCFG_PMU_0:
		ddata->config |= ST_A9_IRQ_EN_PMU_0;
		break;
	case ST_IRQ_SYSCFG_PMU_1:
		ddata->config |= ST_A9_IRQ_EN_PMU_1;
		break;
	case ST_IRQ_SYSCFG_pl310_L2:
		ddata->config |= ST_A9_IRQ_EN_PL310_L2;
		break;
	case ST_IRQ_SYSCFG_DISABLED:
		return 0;
	default:
		dev_err(&pdev->dev, "Unrecognised device %d\n", device);
		return -EINVAL;
	}

	/* Select IRQ/FIQ channel for device. */
	ddata->config |= irq ?
		ST_A9_IRQ_N_SEL(device, channel) :
		ST_A9_FIQ_N_SEL(device, channel);

	return 0;
}

static int st_irq_syscfg_enable(struct platform_device *pdev)
{
	struct device_node *np = pdev->dev.of_node;
	struct st_irq_syscfg *ddata = dev_get_drvdata(&pdev->dev);
	int channels, ret, i;
	u32 device, invert;

	channels = of_property_count_u32_elems(np, "st,irq-device");
	if (channels != ST_A9_IRQ_MAX_CHANS) {
		dev_err(&pdev->dev, "st,enable-irq-device must have 2 elems\n");
		return -EINVAL;
	}

	channels = of_property_count_u32_elems(np, "st,fiq-device");
	if (channels != ST_A9_IRQ_MAX_CHANS) {
		dev_err(&pdev->dev, "st,enable-fiq-device must have 2 elems\n");
		return -EINVAL;
	}

	for (i = 0; i < ST_A9_IRQ_MAX_CHANS; i++) {
		of_property_read_u32_index(np, "st,irq-device", i, &device);

		ret = st_irq_xlate(pdev, device, i, true);
		if (ret)
			return ret;

		of_property_read_u32_index(np, "st,fiq-device", i, &device);

		ret = st_irq_xlate(pdev, device, i, false);
		if (ret)
			return ret;
	}

	/* External IRQs may be inverted. */
	of_property_read_u32(np, "st,invert-ext", &invert);
	ddata->config |= ST_A9_EXTIRQ_INV_SEL(invert);

	return regmap_update_bits(ddata->regmap, ddata->syscfg,
				  ST_A9_IRQ_MASK, ddata->config);
}

static int st_irq_syscfg_probe(struct platform_device *pdev)
{
	struct device_node *np = pdev->dev.of_node;
	const struct of_device_id *match;
	struct st_irq_syscfg *ddata;

	ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
	if (!ddata)
		return -ENOMEM;

	match = of_match_device(st_irq_syscfg_match, &pdev->dev);
	if (!match)
		return -ENODEV;

	ddata->syscfg = (unsigned int)match->data;

	ddata->regmap = syscon_regmap_lookup_by_phandle(np, "st,syscfg");
	if (IS_ERR(ddata->regmap)) {
		dev_err(&pdev->dev, "syscfg phandle missing\n");
		return PTR_ERR(ddata->regmap);
	}

	dev_set_drvdata(&pdev->dev, ddata);

	return st_irq_syscfg_enable(pdev);
}

static int __maybe_unused st_irq_syscfg_resume(struct device *dev)
{
	struct st_irq_syscfg *ddata = dev_get_drvdata(dev);

	return regmap_update_bits(ddata->regmap, ddata->syscfg,
				  ST_A9_IRQ_MASK, ddata->config);
}

static SIMPLE_DEV_PM_OPS(st_irq_syscfg_pm_ops, NULL, st_irq_syscfg_resume);

static struct platform_driver st_irq_syscfg_driver = {
	.driver = {
		.name = "st_irq_syscfg",
		.pm = &st_irq_syscfg_pm_ops,
		.of_match_table = st_irq_syscfg_match,
	},
	.probe = st_irq_syscfg_probe,
};

static int __init st_irq_syscfg_init(void)
{
	return platform_driver_register(&st_irq_syscfg_driver);
}
core_initcall(st_irq_syscfg_init);
Commit	Line	Data
07088484 LJ	1	/*
	2	* Copyright (C) 2014 STMicroelectronics – All Rights Reserved
	3	*
	4	* Author: Lee Jones <[email protected]>
	5	*
	6	* This is a re-write of Christophe Kerello's PMU driver.
	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 <dt-bindings/interrupt-controller/irq-st.h>
	14	#include <linux/err.h>
	15	#include <linux/mfd/syscon.h>
	16	#include <linux/of_device.h>
	17	#include <linux/platform_device.h>
	18	#include <linux/regmap.h>
	19	#include <linux/slab.h>
	20
	21	#define STIH415_SYSCFG_642 0x0a8
	22	#define STIH416_SYSCFG_7543 0x87c
	23	#define STIH407_SYSCFG_5102 0x198
	24	#define STID127_SYSCFG_734 0x088
	25
	26	#define ST_A9_IRQ_MASK 0x001FFFFF
	27	#define ST_A9_IRQ_MAX_CHANS 2
	28
	29	#define ST_A9_IRQ_EN_CTI_0 BIT(0)
	30	#define ST_A9_IRQ_EN_CTI_1 BIT(1)
	31	#define ST_A9_IRQ_EN_PMU_0 BIT(2)
	32	#define ST_A9_IRQ_EN_PMU_1 BIT(3)
	33	#define ST_A9_IRQ_EN_PL310_L2 BIT(4)
	34	#define ST_A9_IRQ_EN_EXT_0 BIT(5)
	35	#define ST_A9_IRQ_EN_EXT_1 BIT(6)
	36	#define ST_A9_IRQ_EN_EXT_2 BIT(7)
	37
	38	#define ST_A9_FIQ_N_SEL(dev, chan) (dev << (8 + (chan * 3)))
	39	#define ST_A9_IRQ_N_SEL(dev, chan) (dev << (14 + (chan * 3)))
	40	#define ST_A9_EXTIRQ_INV_SEL(dev) (dev << 20)
	41
	42	struct st_irq_syscfg {
	43	struct regmap *regmap;
	44	unsigned int syscfg;
	45	unsigned int config;
	46	bool ext_inverted;
	47	};
	48
	49	static const struct of_device_id st_irq_syscfg_match[] = {
	50	{
	51	.compatible = "st,stih415-irq-syscfg",
	52	.data = (void *)STIH415_SYSCFG_642,
	53	},
	54	{
	55	.compatible = "st,stih416-irq-syscfg",
	56	.data = (void *)STIH416_SYSCFG_7543,
	57	},
	58	{
	59	.compatible = "st,stih407-irq-syscfg",
	60	.data = (void *)STIH407_SYSCFG_5102,
	61	},
	62	{
	63	.compatible = "st,stid127-irq-syscfg",
	64	.data = (void *)STID127_SYSCFG_734,
65	},
66	{}
67	};
68
69	static int st_irq_xlate(struct platform_device *pdev,
70	int device, int channel, bool irq)
71	{
72	struct st_irq_syscfg *ddata = dev_get_drvdata(&pdev->dev);
73
74	/* Set the device enable bit. */
75	switch (device) {
76	case ST_IRQ_SYSCFG_EXT_0:
77	ddata->config \|= ST_A9_IRQ_EN_EXT_0;
78	break;
79	case ST_IRQ_SYSCFG_EXT_1:
80	ddata->config \|= ST_A9_IRQ_EN_EXT_1;
81	break;
82	case ST_IRQ_SYSCFG_EXT_2:
83	ddata->config \|= ST_A9_IRQ_EN_EXT_2;
84	break;
85	case ST_IRQ_SYSCFG_CTI_0:
86	ddata->config \|= ST_A9_IRQ_EN_CTI_0;
87	break;
88	case ST_IRQ_SYSCFG_CTI_1:
89	ddata->config \|= ST_A9_IRQ_EN_CTI_1;
90	break;
91	case ST_IRQ_SYSCFG_PMU_0:
92	ddata->config \|= ST_A9_IRQ_EN_PMU_0;
93	break;
94	case ST_IRQ_SYSCFG_PMU_1:
95	ddata->config \|= ST_A9_IRQ_EN_PMU_1;
96	break;
97	case ST_IRQ_SYSCFG_pl310_L2:
98	ddata->config \|= ST_A9_IRQ_EN_PL310_L2;
99	break;
100	case ST_IRQ_SYSCFG_DISABLED:
101	return 0;
102	default:
103	dev_err(&pdev->dev, "Unrecognised device %d\n", device);
104	return -EINVAL;
105	}
106
107	/* Select IRQ/FIQ channel for device. */
108	ddata->config \|= irq ?
109	ST_A9_IRQ_N_SEL(device, channel) :
110	ST_A9_FIQ_N_SEL(device, channel);
111
112	return 0;
113	}
114
115	static int st_irq_syscfg_enable(struct platform_device *pdev)
116	{
117	struct device_node *np = pdev->dev.of_node;
118	struct st_irq_syscfg *ddata = dev_get_drvdata(&pdev->dev);
119	int channels, ret, i;
120	u32 device, invert;
121
122	channels = of_property_count_u32_elems(np, "st,irq-device");
123	if (channels != ST_A9_IRQ_MAX_CHANS) {
124	dev_err(&pdev->dev, "st,enable-irq-device must have 2 elems\n");
125	return -EINVAL;
126	}
127
128	channels = of_property_count_u32_elems(np, "st,fiq-device");
129	if (channels != ST_A9_IRQ_MAX_CHANS) {
130	dev_err(&pdev->dev, "st,enable-fiq-device must have 2 elems\n");
131	return -EINVAL;
132	}
133
134	for (i = 0; i < ST_A9_IRQ_MAX_CHANS; i++) {
135	of_property_read_u32_index(np, "st,irq-device", i, &device);
136
137	ret = st_irq_xlate(pdev, device, i, true);
138	if (ret)
139	return ret;
140
141	of_property_read_u32_index(np, "st,fiq-device", i, &device);
142
143	ret = st_irq_xlate(pdev, device, i, false);
144	if (ret)
145	return ret;
146	}
147
148	/* External IRQs may be inverted. */
149	of_property_read_u32(np, "st,invert-ext", &invert);
150	ddata->config \|= ST_A9_EXTIRQ_INV_SEL(invert);
151
152	return regmap_update_bits(ddata->regmap, ddata->syscfg,
153	ST_A9_IRQ_MASK, ddata->config);
154	}
155
156	static int st_irq_syscfg_probe(struct platform_device *pdev)
157	{
158	struct device_node *np = pdev->dev.of_node;
159	const struct of_device_id *match;
160	struct st_irq_syscfg *ddata;
161
162	ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
163	if (!ddata)
164	return -ENOMEM;
165
166	match = of_match_device(st_irq_syscfg_match, &pdev->dev);
167	if (!match)
168	return -ENODEV;
169
170	ddata->syscfg = (unsigned int)match->data;
171
172	ddata->regmap = syscon_regmap_lookup_by_phandle(np, "st,syscfg");
173	if (IS_ERR(ddata->regmap)) {
174	dev_err(&pdev->dev, "syscfg phandle missing\n");
175	return PTR_ERR(ddata->regmap);
176	}
177
178	dev_set_drvdata(&pdev->dev, ddata);
179
180	return st_irq_syscfg_enable(pdev);
181	}
182
f357563f	183	static int __maybe_unused st_irq_syscfg_resume(struct device *dev)
07088484 LJ	184	{
	185	struct st_irq_syscfg *ddata = dev_get_drvdata(dev);
	186
	187	return regmap_update_bits(ddata->regmap, ddata->syscfg,
	188	ST_A9_IRQ_MASK, ddata->config);
	189	}
	190
	191	static SIMPLE_DEV_PM_OPS(st_irq_syscfg_pm_ops, NULL, st_irq_syscfg_resume);
	192
	193	static struct platform_driver st_irq_syscfg_driver = {
	194	.driver = {
	195	.name = "st_irq_syscfg",
	196	.pm = &st_irq_syscfg_pm_ops,
	197	.of_match_table = st_irq_syscfg_match,
	198	},
	199	.probe = st_irq_syscfg_probe,
	200	};
	201
	202	static int __init st_irq_syscfg_init(void)
	203	{
	204	return platform_driver_register(&st_irq_syscfg_driver);
	205	}
	206	core_initcall(st_irq_syscfg_init);