1 /*
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
irq_to_tps65910_irq(struct tps65910 * tps65910,int irq)26 static 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 */
tps65910_irq(int irq,void * irq_data)41 static irqreturn_t tps65910_irq(int irq, void *irq_data)
42 {
43 struct tps65910 *tps65910 = irq_data;
44 u32 irq_sts;
45 u32 irq_mask;
46 u8 reg;
47 int i;
48
49 tps65910->read(tps65910, TPS65910_INT_STS, 1, ®);
50 irq_sts = reg;
51 tps65910->read(tps65910, TPS65910_INT_STS2, 1, ®);
52 irq_sts |= reg << 8;
53 switch (tps65910_chip_id(tps65910)) {
54 case TPS65911:
55 tps65910->read(tps65910, TPS65910_INT_STS3, 1, ®);
56 irq_sts |= reg << 16;
57 }
58
59 tps65910->read(tps65910, TPS65910_INT_MSK, 1, ®);
60 irq_mask = reg;
61 tps65910->read(tps65910, TPS65910_INT_MSK2, 1, ®);
62 irq_mask |= reg << 8;
63 switch (tps65910_chip_id(tps65910)) {
64 case TPS65911:
65 tps65910->read(tps65910, TPS65910_INT_MSK3, 1, ®);
66 irq_mask |= reg << 16;
67 }
68
69 irq_sts &= ~irq_mask;
70
71 if (!irq_sts)
72 return IRQ_NONE;
73
74 for (i = 0; i < tps65910->irq_num; i++) {
75
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;
84 irq_sts >>= 8;
85 tps65910->write(tps65910, TPS65910_INT_STS, 1, ®);
86 reg = irq_sts & 0xFF;
87 tps65910->write(tps65910, TPS65910_INT_STS2, 1, ®);
88 switch (tps65910_chip_id(tps65910)) {
89 case TPS65911:
90 reg = irq_sts >> 8;
91 tps65910->write(tps65910, TPS65910_INT_STS3, 1, ®);
92 }
93
94 return IRQ_HANDLED;
95 }
96
tps65910_irq_lock(struct irq_data * data)97 static 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
tps65910_irq_sync_unlock(struct irq_data * data)104 static void tps65910_irq_sync_unlock(struct irq_data *data)
105 {
106 struct tps65910 *tps65910 = irq_data_get_irq_chip_data(data);
107 u32 reg_mask;
108 u8 reg;
109
110 tps65910->read(tps65910, TPS65910_INT_MSK, 1, ®);
111 reg_mask = reg;
112 tps65910->read(tps65910, TPS65910_INT_MSK2, 1, ®);
113 reg_mask |= reg << 8;
114 switch (tps65910_chip_id(tps65910)) {
115 case TPS65911:
116 tps65910->read(tps65910, TPS65910_INT_MSK3, 1, ®);
117 reg_mask |= reg << 16;
118 }
119
120 if (tps65910->irq_mask != reg_mask) {
121 reg = tps65910->irq_mask & 0xFF;
122 tps65910->write(tps65910, TPS65910_INT_MSK, 1, ®);
123 reg = tps65910->irq_mask >> 8 & 0xFF;
124 tps65910->write(tps65910, TPS65910_INT_MSK2, 1, ®);
125 switch (tps65910_chip_id(tps65910)) {
126 case TPS65911:
127 reg = tps65910->irq_mask >> 16;
128 tps65910->write(tps65910, TPS65910_INT_MSK3, 1, ®);
129 }
130 }
131 mutex_unlock(&tps65910->irq_lock);
132 }
133
tps65910_irq_enable(struct irq_data * data)134 static 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
tps65910_irq_disable(struct irq_data * data)141 static 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
148 static 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
tps65910_irq_init(struct tps65910 * tps65910,int irq,struct tps65910_platform_data * pdata)156 int 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;
161
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
172 tps65910->irq_mask = 0xFFFFFF;
173
174 mutex_init(&tps65910->irq_lock);
175 tps65910->chip_irq = irq;
176 tps65910->irq_base = pdata->irq_base;
177
178 switch (tps65910_chip_id(tps65910)) {
179 case TPS65910:
180 tps65910->irq_num = TPS65910_NUM_IRQ;
181 break;
182 case TPS65911:
183 tps65910->irq_num = TPS65911_NUM_IRQ;
184 break;
185 }
186
187 /* Register with genirq */
188 for (cur_irq = tps65910->irq_base;
189 cur_irq < tps65910->irq_num + tps65910->irq_base;
190 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);
207
208 irq_set_irq_type(irq, IRQ_TYPE_LEVEL_LOW);
209
210 if (ret != 0)
211 dev_err(tps65910->dev, "Failed to request IRQ: %d\n", ret);
212
213 return ret;
214 }
215
tps65910_irq_exit(struct tps65910 * tps65910)216 int tps65910_irq_exit(struct tps65910 *tps65910)
217 {
218 if (tps65910->chip_irq)
219 free_irq(tps65910->chip_irq, tps65910);
220 return 0;
221 }
222