aboutsummaryrefslogtreecommitdiff
path: root/drivers/mfd/twl6040-irq.c
blob: 4b42543da2282cae615fbc77583491b486903542 (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
199
200
201
202
203
204
205
/*
 * Interrupt controller support for TWL6040
 *
 * Author:     Misael Lopez Cruz <misael.lopez@ti.com>
 *
 * Copyright:   (C) 2011 Texas Instruments, Inc.
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 *
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/err.h>
#include <linux/irq.h>
#include <linux/of.h>
#include <linux/irqdomain.h>
#include <linux/interrupt.h>
#include <linux/mfd/core.h>
#include <linux/mfd/twl6040.h>

struct twl6040_irq_data {
	int mask;
	int status;
};

static struct twl6040_irq_data twl6040_irqs[] = {
	{
		.mask = TWL6040_THMSK,
		.status = TWL6040_THINT,
	},
	{
		.mask = TWL6040_PLUGMSK,
		.status = TWL6040_PLUGINT | TWL6040_UNPLUGINT,
	},
	{
		.mask = TWL6040_HOOKMSK,
		.status = TWL6040_HOOKINT,
	},
	{
		.mask = TWL6040_HFMSK,
		.status = TWL6040_HFINT,
	},
	{
		.mask = TWL6040_VIBMSK,
		.status = TWL6040_VIBINT,
	},
	{
		.mask = TWL6040_READYMSK,
		.status = TWL6040_READYINT,
	},
};

static inline
struct twl6040_irq_data *irq_to_twl6040_irq(struct twl6040 *twl6040,
					    int irq)
{
	return &twl6040_irqs[irq - twl6040->irq_base];
}

static void twl6040_irq_lock(struct irq_data *data)
{
	struct twl6040 *twl6040 = irq_data_get_irq_chip_data(data);

	mutex_lock(&twl6040->irq_mutex);
}

static void twl6040_irq_sync_unlock(struct irq_data *data)
{
	struct twl6040 *twl6040 = irq_data_get_irq_chip_data(data);

	/* write back to hardware any change in irq mask */
	if (twl6040->irq_masks_cur != twl6040->irq_masks_cache) {
		twl6040->irq_masks_cache = twl6040->irq_masks_cur;
		twl6040_reg_write(twl6040, TWL6040_REG_INTMR,
				  twl6040->irq_masks_cur);
	}

	mutex_unlock(&twl6040->irq_mutex);
}

static void twl6040_irq_enable(struct irq_data *data)
{
	struct twl6040 *twl6040 = irq_data_get_irq_chip_data(data);
	struct twl6040_irq_data *irq_data = irq_to_twl6040_irq(twl6040,
							       data->irq);

	twl6040->irq_masks_cur &= ~irq_data->mask;
}

static void twl6040_irq_disable(struct irq_data *data)
{
	struct twl6040 *twl6040 = irq_data_get_irq_chip_data(data);
	struct twl6040_irq_data *irq_data = irq_to_twl6040_irq(twl6040,
							       data->irq);

	twl6040->irq_masks_cur |= irq_data->mask;
}

static struct irq_chip twl6040_irq_chip = {
	.name			= "twl6040",
	.irq_bus_lock		= twl6040_irq_lock,
	.irq_bus_sync_unlock	= twl6040_irq_sync_unlock,
	.irq_enable		= twl6040_irq_enable,
	.irq_disable		= twl6040_irq_disable,
};

static irqreturn_t twl6040_irq_thread(int irq, void *data)
{
	struct twl6040 *twl6040 = data;
	u8 intid;
	int i;

	intid = twl6040_reg_read(twl6040, TWL6040_REG_INTID);

	/* apply masking and report (backwards to handle READYINT first) */
	for (i = ARRAY_SIZE(twl6040_irqs) - 1; i >= 0; i--) {
		if (twl6040->irq_masks_cur & twl6040_irqs[i].mask)
			intid &= ~twl6040_irqs[i].status;
		if (intid & twl6040_irqs[i].status)
			handle_nested_irq(twl6040->irq_base + i);
	}

	/* ack unmasked irqs */
	twl6040_reg_write(twl6040, TWL6040_REG_INTID, intid);

	return IRQ_HANDLED;
}

int twl6040_irq_init(struct twl6040 *twl6040)
{
	struct device_node *node = twl6040->dev->of_node;
	int i, nr_irqs, irq_base, ret;
	u8 val;

	mutex_init(&twl6040->irq_mutex);

	/* mask the individual interrupt sources */
	twl6040->irq_masks_cur = TWL6040_ALLINT_MSK;
	twl6040->irq_masks_cache = TWL6040_ALLINT_MSK;
	twl6040_reg_write(twl6040, TWL6040_REG_INTMR, TWL6040_ALLINT_MSK);

	nr_irqs = ARRAY_SIZE(twl6040_irqs);

	irq_base = irq_alloc_descs(-1, 0, nr_irqs, 0);
	if (IS_ERR_VALUE(irq_base)) {
		dev_err(twl6040->dev, "Fail to allocate IRQ descs\n");
		return irq_base;
	}
	twl6040->irq_base = irq_base;

	irq_domain_add_legacy(node, ARRAY_SIZE(twl6040_irqs), irq_base, 0,
			      &irq_domain_simple_ops, NULL);

	/* Register them with genirq */
	for (i = irq_base; i < irq_base + nr_irqs; i++) {
		irq_set_chip_data(i, twl6040);
		irq_set_chip_and_handler(i, &twl6040_irq_chip,
					 handle_level_irq);
		irq_set_nested_thread(i, 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(i, IRQF_VALID);
#else
		irq_set_noprobe(i);
#endif
	}

	ret = request_threaded_irq(twl6040->irq, NULL, twl6040_irq_thread,
				   IRQF_ONESHOT, "twl6040", twl6040);
	if (ret) {
		dev_err(twl6040->dev, "failed to request IRQ %d: %d\n",
			twl6040->irq, ret);
		return ret;
	}

	/* reset interrupts */
	val = twl6040_reg_read(twl6040, TWL6040_REG_INTID);

	/* interrupts cleared on write */
	twl6040_clear_bits(twl6040, TWL6040_REG_ACCCTL, TWL6040_INTCLRMODE);

	return 0;
}
EXPORT_SYMBOL(twl6040_irq_init);

void twl6040_irq_exit(struct twl6040 *twl6040)
{
	free_irq(twl6040->irq, twl6040);
}
EXPORT_SYMBOL(twl6040_irq_exit);