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Mark Brown966cdc92012-06-19 16:34:23 +01001/*
2 * Arizona interrupt support
3 *
4 * Copyright 2012 Wolfson Microelectronics plc
5 *
6 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12
13#include <linux/delay.h>
14#include <linux/gpio.h>
15#include <linux/interrupt.h>
16#include <linux/irq.h>
17#include <linux/irqdomain.h>
18#include <linux/module.h>
19#include <linux/pm_runtime.h>
20#include <linux/regmap.h>
21#include <linux/regulator/consumer.h>
22#include <linux/slab.h>
23
24#include <linux/mfd/arizona/core.h>
25#include <linux/mfd/arizona/registers.h>
26
27#include "arizona.h"
28
29static int arizona_map_irq(struct arizona *arizona, int irq)
30{
31 int ret;
32
33 ret = regmap_irq_get_virq(arizona->aod_irq_chip, irq);
34 if (ret < 0)
35 ret = regmap_irq_get_virq(arizona->irq_chip, irq);
36
37 return ret;
38}
39
40int arizona_request_irq(struct arizona *arizona, int irq, char *name,
41 irq_handler_t handler, void *data)
42{
43 irq = arizona_map_irq(arizona, irq);
44 if (irq < 0)
45 return irq;
46
47 return request_threaded_irq(irq, NULL, handler, IRQF_ONESHOT,
48 name, data);
49}
50EXPORT_SYMBOL_GPL(arizona_request_irq);
51
52void arizona_free_irq(struct arizona *arizona, int irq, void *data)
53{
54 irq = arizona_map_irq(arizona, irq);
55 if (irq < 0)
56 return;
57
58 free_irq(irq, data);
59}
60EXPORT_SYMBOL_GPL(arizona_free_irq);
61
62int arizona_set_irq_wake(struct arizona *arizona, int irq, int on)
63{
64 irq = arizona_map_irq(arizona, irq);
65 if (irq < 0)
66 return irq;
67
68 return irq_set_irq_wake(irq, on);
69}
70EXPORT_SYMBOL_GPL(arizona_set_irq_wake);
71
72static irqreturn_t arizona_boot_done(int irq, void *data)
73{
74 struct arizona *arizona = data;
75
76 dev_dbg(arizona->dev, "Boot done\n");
77
78 return IRQ_HANDLED;
79}
80
81static irqreturn_t arizona_ctrlif_err(int irq, void *data)
82{
83 struct arizona *arizona = data;
84
85 /*
86 * For pretty much all potential sources a register cache sync
87 * won't help, we've just got a software bug somewhere.
88 */
89 dev_err(arizona->dev, "Control interface error\n");
90
91 return IRQ_HANDLED;
92}
93
94static irqreturn_t arizona_irq_thread(int irq, void *data)
95{
96 struct arizona *arizona = data;
Mark Brown3080de42012-08-21 20:02:03 +010097 unsigned int val;
Mark Browncdabc1c2012-09-08 09:00:59 +080098 int ret;
Mark Brown966cdc92012-06-19 16:34:23 +010099
100 ret = pm_runtime_get_sync(arizona->dev);
101 if (ret < 0) {
102 dev_err(arizona->dev, "Failed to resume device: %d\n", ret);
103 return IRQ_NONE;
104 }
105
Mark Brown3080de42012-08-21 20:02:03 +0100106 /* Always handle the AoD domain */
107 handle_nested_irq(irq_find_mapping(arizona->virq, 0));
108
109 /*
110 * Check if one of the main interrupts is asserted and only
111 * check that domain if it is.
112 */
113 ret = regmap_read(arizona->regmap, ARIZONA_IRQ_PIN_STATUS, &val);
114 if (ret == 0 && val & ARIZONA_IRQ1_STS) {
115 handle_nested_irq(irq_find_mapping(arizona->virq, 1));
116 } else if (ret != 0) {
117 dev_err(arizona->dev, "Failed to read main IRQ status: %d\n",
118 ret);
119 }
Mark Brown966cdc92012-06-19 16:34:23 +0100120
121 pm_runtime_mark_last_busy(arizona->dev);
122 pm_runtime_put_autosuspend(arizona->dev);
123
124 return IRQ_HANDLED;
125}
126
127static void arizona_irq_enable(struct irq_data *data)
128{
129}
130
131static void arizona_irq_disable(struct irq_data *data)
132{
133}
134
135static struct irq_chip arizona_irq_chip = {
136 .name = "arizona",
137 .irq_disable = arizona_irq_disable,
138 .irq_enable = arizona_irq_enable,
139};
140
141static int arizona_irq_map(struct irq_domain *h, unsigned int virq,
142 irq_hw_number_t hw)
143{
144 struct regmap_irq_chip_data *data = h->host_data;
145
146 irq_set_chip_data(virq, data);
147 irq_set_chip_and_handler(virq, &arizona_irq_chip, handle_edge_irq);
148 irq_set_nested_thread(virq, 1);
149
150 /* ARM needs us to explicitly flag the IRQ as valid
151 * and will set them noprobe when we do so. */
152#ifdef CONFIG_ARM
153 set_irq_flags(virq, IRQF_VALID);
154#else
155 irq_set_noprobe(virq);
156#endif
157
158 return 0;
159}
160
161static struct irq_domain_ops arizona_domain_ops = {
162 .map = arizona_irq_map,
163 .xlate = irq_domain_xlate_twocell,
164};
165
166int arizona_irq_init(struct arizona *arizona)
167{
168 int flags = IRQF_ONESHOT;
169 int ret, i;
170 const struct regmap_irq_chip *aod, *irq;
Mark Brown92d80132012-08-07 19:57:53 +0100171 bool ctrlif_error = true;
Mark Brown966cdc92012-06-19 16:34:23 +0100172
173 switch (arizona->type) {
Mark Brown863df8d2012-07-05 20:35:31 +0100174#ifdef CONFIG_MFD_WM5102
Mark Brown966cdc92012-06-19 16:34:23 +0100175 case WM5102:
176 aod = &wm5102_aod;
177 irq = &wm5102_irq;
Mark Brown92d80132012-08-07 19:57:53 +0100178
Mark Browne1bfe752012-12-05 11:46:04 +0900179 ctrlif_error = false;
Mark Brown966cdc92012-06-19 16:34:23 +0100180 break;
Mark Brown863df8d2012-07-05 20:35:31 +0100181#endif
Mark Browne102bef2012-07-10 12:37:58 +0100182#ifdef CONFIG_MFD_WM5110
183 case WM5110:
184 aod = &wm5110_aod;
185 irq = &wm5110_irq;
Mark Brown92d80132012-08-07 19:57:53 +0100186
Mark Browne1bfe752012-12-05 11:46:04 +0900187 ctrlif_error = false;
Mark Browne102bef2012-07-10 12:37:58 +0100188 break;
189#endif
Mark Brown966cdc92012-06-19 16:34:23 +0100190 default:
191 BUG_ON("Unknown Arizona class device" == NULL);
192 return -EINVAL;
193 }
194
195 if (arizona->pdata.irq_active_high) {
196 ret = regmap_update_bits(arizona->regmap, ARIZONA_IRQ_CTRL_1,
197 ARIZONA_IRQ_POL, 0);
198 if (ret != 0) {
199 dev_err(arizona->dev, "Couldn't set IRQ polarity: %d\n",
200 ret);
201 goto err;
202 }
203
204 flags |= IRQF_TRIGGER_HIGH;
205 } else {
206 flags |= IRQF_TRIGGER_LOW;
207 }
208
209 /* Allocate a virtual IRQ domain to distribute to the regmap domains */
210 arizona->virq = irq_domain_add_linear(NULL, 2, &arizona_domain_ops,
211 arizona);
212 if (!arizona->virq) {
Mark Brownb7dea5d2012-12-05 11:46:26 +0900213 dev_err(arizona->dev, "Failed to add core IRQ domain\n");
Mark Brown966cdc92012-06-19 16:34:23 +0100214 ret = -EINVAL;
215 goto err;
216 }
217
218 ret = regmap_add_irq_chip(arizona->regmap,
219 irq_create_mapping(arizona->virq, 0),
220 IRQF_ONESHOT, -1, aod,
221 &arizona->aod_irq_chip);
222 if (ret != 0) {
223 dev_err(arizona->dev, "Failed to add AOD IRQs: %d\n", ret);
224 goto err_domain;
225 }
226
227 ret = regmap_add_irq_chip(arizona->regmap,
228 irq_create_mapping(arizona->virq, 1),
229 IRQF_ONESHOT, -1, irq,
230 &arizona->irq_chip);
231 if (ret != 0) {
232 dev_err(arizona->dev, "Failed to add AOD IRQs: %d\n", ret);
233 goto err_aod;
234 }
235
236 /* Make sure the boot done IRQ is unmasked for resumes */
237 i = arizona_map_irq(arizona, ARIZONA_IRQ_BOOT_DONE);
238 ret = request_threaded_irq(i, NULL, arizona_boot_done, IRQF_ONESHOT,
239 "Boot done", arizona);
240 if (ret != 0) {
241 dev_err(arizona->dev, "Failed to request boot done %d: %d\n",
242 arizona->irq, ret);
243 goto err_boot_done;
244 }
245
246 /* Handle control interface errors in the core */
Mark Brown92d80132012-08-07 19:57:53 +0100247 if (ctrlif_error) {
248 i = arizona_map_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR);
249 ret = request_threaded_irq(i, NULL, arizona_ctrlif_err,
250 IRQF_ONESHOT,
251 "Control interface error", arizona);
252 if (ret != 0) {
253 dev_err(arizona->dev,
254 "Failed to request CTRLIF_ERR %d: %d\n",
255 arizona->irq, ret);
256 goto err_ctrlif;
257 }
Mark Brown966cdc92012-06-19 16:34:23 +0100258 }
259
260 ret = request_threaded_irq(arizona->irq, NULL, arizona_irq_thread,
261 flags, "arizona", arizona);
262
263 if (ret != 0) {
264 dev_err(arizona->dev, "Failed to request IRQ %d: %d\n",
265 arizona->irq, ret);
266 goto err_main_irq;
267 }
268
269 return 0;
270
271err_main_irq:
272 free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR), arizona);
273err_ctrlif:
274 free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_BOOT_DONE), arizona);
275err_boot_done:
276 regmap_del_irq_chip(irq_create_mapping(arizona->virq, 1),
277 arizona->irq_chip);
278err_aod:
279 regmap_del_irq_chip(irq_create_mapping(arizona->virq, 0),
280 arizona->aod_irq_chip);
281err_domain:
282err:
283 return ret;
284}
285
286int arizona_irq_exit(struct arizona *arizona)
287{
288 free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR), arizona);
289 free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_BOOT_DONE), arizona);
290 regmap_del_irq_chip(irq_create_mapping(arizona->virq, 1),
291 arizona->irq_chip);
292 regmap_del_irq_chip(irq_create_mapping(arizona->virq, 0),
293 arizona->aod_irq_chip);
294 free_irq(arizona->irq, arizona);
295
296 return 0;
297}