aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/mfd/tps65910-irq.c
blob: 95c0d7978bec4a67cfaa74d8c93b430dc715974b (plain) (blame)
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
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
/*
 * tps65910-irq.c  --  TI TPS6591x
 *
 * Copyright 2010 Texas Instruments Inc.
 *
 * Author: Graeme Gregory <gg@slimlogic.co.uk>
 * Author: Jorge Eduardo Candelaria <jedu@slimlogic.co.uk>
 *
 *  This program is free software; you can redistribute it and/or modify it
 *  under  the terms of the GNU General  Public License as published by the
 *  Free Software Foundation;  either version 2 of the License, or (at your
 *  option) any later version.
 *
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/bug.h>
#include <linux/device.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/gpio.h>
#include <linux/mfd/tps65910.h>

static inline int irq_to_tps65910_irq(struct tps65910 *tps65910,
							int irq)
{
	return (irq - tps65910->irq_base);
}

/*
 * This is a threaded IRQ handler so can access I2C/SPI.  Since all
 * interrupts are clear on read the IRQ line will be reasserted and
 * the physical IRQ will be handled again if another interrupt is
 * asserted while we run - in the normal course of events this is a
 * rare occurrence so we save I2C/SPI reads.  We're also assuming that
 * it's rare to get lots of interrupts firing simultaneously so try to
 * minimise I/O.
 */
static irqreturn_t tps65910_irq(int irq, void *irq_data)
{
	struct tps65910 *tps65910 = irq_data;
	u32 irq_sts;
	u32 irq_mask;
	u8 reg;
	int i;

	tps65910->read(tps65910, TPS65910_INT_STS, 1, &reg);
	irq_sts = reg;
	tps65910->read(tps65910, TPS65910_INT_STS2, 1, &reg);
	irq_sts |= reg << 8;
	switch (tps65910_chip_id(tps65910)) {
	case TPS65911:
		tps65910->read(tps65910, TPS65910_INT_STS3, 1, &reg);
		irq_sts |= reg << 16;
	}

	tps65910->read(tps65910, TPS65910_INT_MSK, 1, &reg);
	irq_mask = reg;
	tps65910->read(tps65910, TPS65910_INT_MSK2, 1, &reg);
	irq_mask |= reg << 8;
	switch (tps65910_chip_id(tps65910)) {
	case TPS65911:
		tps65910->read(tps65910, TPS65910_INT_MSK3, 1, &reg);
		irq_mask |= reg << 16;
	}

	irq_sts &= ~irq_mask;

	if (!irq_sts)
		return IRQ_NONE;

	for (i = 0; i < tps65910->irq_num; i++) {

		if (!(irq_sts & (1 << i)))
			continue;

		handle_nested_irq(tps65910->irq_base + i);
	}

	/* Write the STS register back to clear IRQs we handled */
	reg = irq_sts & 0xFF;
	irq_sts >>= 8;
	tps65910->write(tps65910, TPS65910_INT_STS, 1, &reg);
	reg = irq_sts & 0xFF;
	tps65910->write(tps65910, TPS65910_INT_STS2, 1, &reg);
	switch (tps65910_chip_id(tps65910)) {
	case TPS65911:
		reg = irq_sts >> 8;
		tps65910->write(tps65910, TPS65910_INT_STS3, 1, &reg);
	}

	return IRQ_HANDLED;
}

static void tps65910_irq_lock(struct irq_data *data)
{
	struct tps65910 *tps65910 = irq_data_get_irq_chip_data(data);

	mutex_lock(&tps65910->irq_lock);
}

static void tps65910_irq_sync_unlock(struct irq_data *data)
{
	struct tps65910 *tps65910 = irq_data_get_irq_chip_data(data);
	u32 reg_mask;
	u8 reg;

	tps65910->read(tps65910, TPS65910_INT_MSK, 1, &reg);
	reg_mask = reg;
	tps65910->read(tps65910, TPS65910_INT_MSK2, 1, &reg);
	reg_mask |= reg << 8;
	switch (tps65910_chip_id(tps65910)) {
	case TPS65911:
		tps65910->read(tps65910, TPS65910_INT_MSK3, 1, &reg);
		reg_mask |= reg << 16;
	}

	if (tps65910->irq_mask != reg_mask) {
		reg = tps65910->irq_mask & 0xFF;
		tps65910->write(tps65910, TPS65910_INT_MSK, 1, &reg);
		reg = tps65910->irq_mask >> 8 & 0xFF;
		tps65910->write(tps65910, TPS65910_INT_MSK2, 1, &reg);
		switch (tps65910_chip_id(tps65910)) {
		case TPS65911:
			reg = tps65910->irq_mask >> 16;
			tps65910->write(tps65910, TPS65910_INT_MSK3, 1, &reg);
		}
	}
	mutex_unlock(&tps65910->irq_lock);
}

static void tps65910_irq_enable(struct irq_data *data)
{
	struct tps65910 *tps65910 = irq_data_get_irq_chip_data(data);

	tps65910->irq_mask &= ~( 1 << irq_to_tps65910_irq(tps65910, data->irq));
}

static void tps65910_irq_disable(struct irq_data *data)
{
	struct tps65910 *tps65910 = irq_data_get_irq_chip_data(data);

	tps65910->irq_mask |= ( 1 << irq_to_tps65910_irq(tps65910, data->irq));
}

static struct irq_chip tps65910_irq_chip = {
	.name = "tps65910",
	.irq_bus_lock = tps65910_irq_lock,
	.irq_bus_sync_unlock = tps65910_irq_sync_unlock,
	.irq_disable = tps65910_irq_disable,
	.irq_enable = tps65910_irq_enable,
};

int tps65910_irq_init(struct tps65910 *tps65910, int irq,
		    struct tps65910_platform_data *pdata)
{
	int ret, cur_irq;
	int flags = IRQF_ONESHOT;

	if (!irq) {
		dev_warn(tps65910->dev, "No interrupt support, no core IRQ\n");
		return -EINVAL;
	}

	if (!pdata || !pdata->irq_base) {
		dev_warn(tps65910->dev, "No interrupt support, no IRQ base\n");
		return -EINVAL;
	}

	tps65910->irq_mask = 0xFFFFFF;

	mutex_init(&tps65910->irq_lock);
	tps65910->chip_irq = irq;
	tps65910->irq_base = pdata->irq_base;

	switch (tps65910_chip_id(tps65910)) {
	case TPS65910:
		tps65910->irq_num = TPS65910_NUM_IRQ;
		break;
	case TPS65911:
		tps65910->irq_num = TPS65911_NUM_IRQ;
		break;
	}

	/* Register with genirq */
	for (cur_irq = tps65910->irq_base;
	     cur_irq < tps65910->irq_num + tps65910->irq_base;
	     cur_irq++) {
		irq_set_chip_data(cur_irq, tps65910);
		irq_set_chip_and_handler(cur_irq, &tps65910_irq_chip,
					 handle_edge_irq);
		irq_set_nested_thread(cur_irq, 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(cur_irq, IRQF_VALID);
#else
		irq_set_noprobe(cur_irq);
#endif
	}

	ret = request_threaded_irq(irq, NULL, tps65910_irq, flags,
				   "tps65910", tps65910);

	irq_set_irq_type(irq, IRQ_TYPE_LEVEL_LOW);

	if (ret != 0)
		dev_err(tps65910->dev, "Failed to request IRQ: %d\n", ret);

	return ret;
}

int tps65910_irq_exit(struct tps65910 *tps65910)
{
	if (tps65910->chip_irq)
		free_irq(tps65910->chip_irq, tps65910);
	return 0;
}