2 * tps65910-irq.c -- TI TPS6591x
4 * Copyright 2010 Texas Instruments Inc.
6 * Author: Graeme Gregory <gg@slimlogic.co.uk>
7 * Author: Jorge Eduardo Candelaria <jedu@slimlogic.co.uk>
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2 of the License, or (at your
12 * option) any later version.
16 #include <linux/kernel.h>
17 #include <linux/module.h>
18 #include <linux/init.h>
19 #include <linux/bug.h>
20 #include <linux/device.h>
21 #include <linux/interrupt.h>
22 #include <linux/irq.h>
23 #include <linux/gpio.h>
24 #include <linux/mfd/tps65910.h>
26 static inline int irq_to_tps65910_irq(struct tps65910 *tps65910,
29 return (irq - tps65910->irq_base);
33 * This is a threaded IRQ handler so can access I2C/SPI. Since all
34 * interrupts are clear on read the IRQ line will be reasserted and
35 * the physical IRQ will be handled again if another interrupt is
36 * asserted while we run - in the normal course of events this is a
37 * rare occurrence so we save I2C/SPI reads. We're also assuming that
38 * it's rare to get lots of interrupts firing simultaneously so try to
41 static irqreturn_t tps65910_irq(int irq, void *irq_data)
43 struct tps65910 *tps65910 = irq_data;
49 tps65910->read(tps65910, TPS65910_INT_STS, 1, ®);
51 tps65910->read(tps65910, TPS65910_INT_STS2, 1, ®);
54 tps65910->read(tps65910, TPS65910_INT_MSK, 1, ®);
56 tps65910->read(tps65910, TPS65910_INT_MSK2, 1, ®);
64 for (i = 0; i < TPS65910_NUM_IRQ; i++) {
66 if (!(irq_sts & (1 << i)))
69 handle_nested_irq(tps65910->irq_base + i);
72 /* Write the STS register back to clear IRQs we handled */
74 tps65910->write(tps65910, TPS65910_INT_STS, 1, ®);
76 tps65910->write(tps65910, TPS65910_INT_STS2, 1, ®);
81 static void tps65910_irq_lock(struct irq_data *data)
83 struct tps65910 *tps65910 = irq_data_get_irq_chip_data(data);
85 mutex_lock(&tps65910->irq_lock);
88 static void tps65910_irq_sync_unlock(struct irq_data *data)
90 struct tps65910 *tps65910 = irq_data_get_irq_chip_data(data);
94 tps65910->read(tps65910, TPS65910_INT_MSK, 1, ®);
96 tps65910->read(tps65910, TPS65910_INT_MSK2, 1, ®);
99 if (tps65910->irq_mask != reg_mask) {
100 reg = tps65910->irq_mask & 0xFF;
101 tps65910->write(tps65910, TPS65910_INT_MSK, 1, ®);
102 reg = tps65910->irq_mask >> 8;
103 tps65910->write(tps65910, TPS65910_INT_MSK2, 1, ®);
105 mutex_unlock(&tps65910->irq_lock);
108 static void tps65910_irq_enable(struct irq_data *data)
110 struct tps65910 *tps65910 = irq_data_get_irq_chip_data(data);
112 tps65910->irq_mask &= ~( 1 << irq_to_tps65910_irq(tps65910, data->irq));
115 static void tps65910_irq_disable(struct irq_data *data)
117 struct tps65910 *tps65910 = irq_data_get_irq_chip_data(data);
119 tps65910->irq_mask |= ( 1 << irq_to_tps65910_irq(tps65910, data->irq));
122 static struct irq_chip tps65910_irq_chip = {
124 .irq_bus_lock = tps65910_irq_lock,
125 .irq_bus_sync_unlock = tps65910_irq_sync_unlock,
126 .irq_disable = tps65910_irq_disable,
127 .irq_enable = tps65910_irq_enable,
130 int tps65910_irq_init(struct tps65910 *tps65910, int irq,
131 struct tps65910_platform_data *pdata)
134 int flags = IRQF_ONESHOT;
138 dev_warn(tps65910->dev, "No interrupt support, no core IRQ\n");
142 if (!pdata || !pdata->irq_base) {
143 dev_warn(tps65910->dev, "No interrupt support, no IRQ base\n");
147 /* Mask top level interrupts */
149 tps65910->write(tps65910, TPS65910_INT_MSK, 1, ®);
151 tps65910->write(tps65910, TPS65910_INT_MSK2, 1, ®);
153 mutex_init(&tps65910->irq_lock);
154 tps65910->chip_irq = irq;
155 tps65910->irq_base = pdata->irq_base;
157 /* Register with genirq */
158 for (cur_irq = tps65910->irq_base;
159 cur_irq < TPS65910_NUM_IRQ + tps65910->irq_base;
161 irq_set_chip_data(cur_irq, tps65910);
162 irq_set_chip_and_handler(cur_irq, &tps65910_irq_chip,
164 irq_set_nested_thread(cur_irq, 1);
166 /* ARM needs us to explicitly flag the IRQ as valid
167 * and will set them noprobe when we do so. */
169 set_irq_flags(cur_irq, IRQF_VALID);
171 irq_set_noprobe(cur_irq);
175 ret = request_threaded_irq(irq, NULL, tps65910_irq, flags,
176 "tps65910", tps65910);
178 dev_err(tps65910->dev, "Failed to request IRQ: %d\n", ret);
183 int tps65910_irq_exit(struct tps65910 *tps65910)
185 free_irq(tps65910->chip_irq, tps65910);