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Graeme Gregorye3471bd2011-05-02 16:20:04 -05001/*
2 * tps65910-irq.c -- TI TPS6591x
3 *
4 * Copyright 2010 Texas Instruments Inc.
5 *
6 * Author: Graeme Gregory <gg@slimlogic.co.uk>
7 * Author: Jorge Eduardo Candelaria <jedu@slimlogic.co.uk>
8 *
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.
13 *
14 */
15
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>
25
26static inline int irq_to_tps65910_irq(struct tps65910 *tps65910,
27 int irq)
28{
29 return (irq - tps65910->irq_base);
30}
31
32/*
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
39 * minimise I/O.
40 */
41static irqreturn_t tps65910_irq(int irq, void *irq_data)
42{
43 struct tps65910 *tps65910 = irq_data;
Jorge Eduardo Candelariaa2974732011-05-16 18:35:07 -050044 u32 irq_sts;
45 u32 irq_mask;
Graeme Gregorye3471bd2011-05-02 16:20:04 -050046 u8 reg;
47 int i;
48
49 tps65910->read(tps65910, TPS65910_INT_STS, 1, &reg);
50 irq_sts = reg;
51 tps65910->read(tps65910, TPS65910_INT_STS2, 1, &reg);
52 irq_sts |= reg << 8;
Jorge Eduardo Candelariaa2974732011-05-16 18:35:07 -050053 switch (tps65910_chip_id(tps65910)) {
54 case TPS65911:
55 tps65910->read(tps65910, TPS65910_INT_STS3, 1, &reg);
56 irq_sts |= reg << 16;
57 }
Graeme Gregorye3471bd2011-05-02 16:20:04 -050058
59 tps65910->read(tps65910, TPS65910_INT_MSK, 1, &reg);
60 irq_mask = reg;
61 tps65910->read(tps65910, TPS65910_INT_MSK2, 1, &reg);
62 irq_mask |= reg << 8;
Jorge Eduardo Candelariaa2974732011-05-16 18:35:07 -050063 switch (tps65910_chip_id(tps65910)) {
64 case TPS65911:
65 tps65910->read(tps65910, TPS65910_INT_MSK3, 1, &reg);
66 irq_mask |= reg << 16;
67 }
Graeme Gregorye3471bd2011-05-02 16:20:04 -050068
69 irq_sts &= ~irq_mask;
70
71 if (!irq_sts)
72 return IRQ_NONE;
73
Jorge Eduardo Candelariaa2974732011-05-16 18:35:07 -050074 for (i = 0; i < tps65910->irq_num; i++) {
Graeme Gregorye3471bd2011-05-02 16:20:04 -050075
76 if (!(irq_sts & (1 << i)))
77 continue;
78
79 handle_nested_irq(tps65910->irq_base + i);
80 }
81
82 /* Write the STS register back to clear IRQs we handled */
83 reg = irq_sts & 0xFF;
Jorge Eduardo Candelariaa2974732011-05-16 18:35:07 -050084 irq_sts >>= 8;
Graeme Gregorye3471bd2011-05-02 16:20:04 -050085 tps65910->write(tps65910, TPS65910_INT_STS, 1, &reg);
Jorge Eduardo Candelariaa2974732011-05-16 18:35:07 -050086 reg = irq_sts & 0xFF;
Graeme Gregorye3471bd2011-05-02 16:20:04 -050087 tps65910->write(tps65910, TPS65910_INT_STS2, 1, &reg);
Jorge Eduardo Candelariaa2974732011-05-16 18:35:07 -050088 switch (tps65910_chip_id(tps65910)) {
89 case TPS65911:
90 reg = irq_sts >> 8;
91 tps65910->write(tps65910, TPS65910_INT_STS3, 1, &reg);
92 }
Graeme Gregorye3471bd2011-05-02 16:20:04 -050093
94 return IRQ_HANDLED;
95}
96
97static void tps65910_irq_lock(struct irq_data *data)
98{
99 struct tps65910 *tps65910 = irq_data_get_irq_chip_data(data);
100
101 mutex_lock(&tps65910->irq_lock);
102}
103
104static void tps65910_irq_sync_unlock(struct irq_data *data)
105{
106 struct tps65910 *tps65910 = irq_data_get_irq_chip_data(data);
Jorge Eduardo Candelariaa2974732011-05-16 18:35:07 -0500107 u32 reg_mask;
Graeme Gregorye3471bd2011-05-02 16:20:04 -0500108 u8 reg;
109
110 tps65910->read(tps65910, TPS65910_INT_MSK, 1, &reg);
111 reg_mask = reg;
112 tps65910->read(tps65910, TPS65910_INT_MSK2, 1, &reg);
113 reg_mask |= reg << 8;
Jorge Eduardo Candelariaa2974732011-05-16 18:35:07 -0500114 switch (tps65910_chip_id(tps65910)) {
115 case TPS65911:
116 tps65910->read(tps65910, TPS65910_INT_MSK3, 1, &reg);
117 reg_mask |= reg << 16;
118 }
Graeme Gregorye3471bd2011-05-02 16:20:04 -0500119
120 if (tps65910->irq_mask != reg_mask) {
121 reg = tps65910->irq_mask & 0xFF;
122 tps65910->write(tps65910, TPS65910_INT_MSK, 1, &reg);
Jorge Eduardo Candelariaa2974732011-05-16 18:35:07 -0500123 reg = tps65910->irq_mask >> 8 & 0xFF;
Graeme Gregorye3471bd2011-05-02 16:20:04 -0500124 tps65910->write(tps65910, TPS65910_INT_MSK2, 1, &reg);
Jorge Eduardo Candelariaa2974732011-05-16 18:35:07 -0500125 switch (tps65910_chip_id(tps65910)) {
126 case TPS65911:
127 reg = tps65910->irq_mask >> 16;
128 tps65910->write(tps65910, TPS65910_INT_MSK3, 1, &reg);
129 }
Graeme Gregorye3471bd2011-05-02 16:20:04 -0500130 }
131 mutex_unlock(&tps65910->irq_lock);
132}
133
134static void tps65910_irq_enable(struct irq_data *data)
135{
136 struct tps65910 *tps65910 = irq_data_get_irq_chip_data(data);
137
138 tps65910->irq_mask &= ~( 1 << irq_to_tps65910_irq(tps65910, data->irq));
139}
140
141static void tps65910_irq_disable(struct irq_data *data)
142{
143 struct tps65910 *tps65910 = irq_data_get_irq_chip_data(data);
144
145 tps65910->irq_mask |= ( 1 << irq_to_tps65910_irq(tps65910, data->irq));
146}
147
148static struct irq_chip tps65910_irq_chip = {
149 .name = "tps65910",
150 .irq_bus_lock = tps65910_irq_lock,
151 .irq_bus_sync_unlock = tps65910_irq_sync_unlock,
152 .irq_disable = tps65910_irq_disable,
153 .irq_enable = tps65910_irq_enable,
154};
155
156int tps65910_irq_init(struct tps65910 *tps65910, int irq,
157 struct tps65910_platform_data *pdata)
158{
159 int ret, cur_irq;
160 int flags = IRQF_ONESHOT;
Graeme Gregorye3471bd2011-05-02 16:20:04 -0500161
162 if (!irq) {
163 dev_warn(tps65910->dev, "No interrupt support, no core IRQ\n");
164 return -EINVAL;
165 }
166
167 if (!pdata || !pdata->irq_base) {
168 dev_warn(tps65910->dev, "No interrupt support, no IRQ base\n");
169 return -EINVAL;
170 }
171
Jorge Eduardo Candelariaa2974732011-05-16 18:35:07 -0500172 tps65910->irq_mask = 0xFFFFFF;
Graeme Gregorye3471bd2011-05-02 16:20:04 -0500173
174 mutex_init(&tps65910->irq_lock);
175 tps65910->chip_irq = irq;
176 tps65910->irq_base = pdata->irq_base;
177
Jorge Eduardo Candelariaa2974732011-05-16 18:35:07 -0500178 switch (tps65910_chip_id(tps65910)) {
179 case TPS65910:
180 tps65910->irq_num = TPS65910_NUM_IRQ;
Johan Hovoldfa948762011-08-15 12:42:03 +0200181 break;
Jorge Eduardo Candelariaa2974732011-05-16 18:35:07 -0500182 case TPS65911:
183 tps65910->irq_num = TPS65911_NUM_IRQ;
Johan Hovoldfa948762011-08-15 12:42:03 +0200184 break;
Jorge Eduardo Candelariaa2974732011-05-16 18:35:07 -0500185 }
186
Graeme Gregorye3471bd2011-05-02 16:20:04 -0500187 /* Register with genirq */
188 for (cur_irq = tps65910->irq_base;
Jorge Eduardo Candelariaa2974732011-05-16 18:35:07 -0500189 cur_irq < tps65910->irq_num + tps65910->irq_base;
Graeme Gregorye3471bd2011-05-02 16:20:04 -0500190 cur_irq++) {
191 irq_set_chip_data(cur_irq, tps65910);
192 irq_set_chip_and_handler(cur_irq, &tps65910_irq_chip,
193 handle_edge_irq);
194 irq_set_nested_thread(cur_irq, 1);
195
196 /* ARM needs us to explicitly flag the IRQ as valid
197 * and will set them noprobe when we do so. */
198#ifdef CONFIG_ARM
199 set_irq_flags(cur_irq, IRQF_VALID);
200#else
201 irq_set_noprobe(cur_irq);
202#endif
203 }
204
205 ret = request_threaded_irq(irq, NULL, tps65910_irq, flags,
206 "tps65910", tps65910);
Jorge Eduardo Candelariaa2974732011-05-16 18:35:07 -0500207
208 irq_set_irq_type(irq, IRQ_TYPE_LEVEL_LOW);
209
Graeme Gregorye3471bd2011-05-02 16:20:04 -0500210 if (ret != 0)
211 dev_err(tps65910->dev, "Failed to request IRQ: %d\n", ret);
212
213 return ret;
214}
215
216int tps65910_irq_exit(struct tps65910 *tps65910)
217{
Afzal Mohammed1e351a92011-12-14 16:05:35 +0530218 if (tps65910->chip_irq)
219 free_irq(tps65910->chip_irq, tps65910);
Graeme Gregorye3471bd2011-05-02 16:20:04 -0500220 return 0;
221}