summaryrefslogtreecommitdiffstats
path: root/drivers/irqchip/irq-st.c
blob: 1b83512b29c62ae5e6bec5daf83faa85f2d358f7 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
// SPDX-License-Identifier: GPL-2.0-only
/*
 *  Copyright (C) 2014 STMicroelectronics – All Rights Reserved
 *
 *  Author: Lee Jones <lee.jones@linaro.org>
 *
 *  This is a re-write of Christophe Kerello's PMU driver.
 */

#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;
	struct st_irq_syscfg *ddata;

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

	ddata->syscfg = (unsigned int) device_get_match_data(&pdev->dev);

	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);