blob: 64cd9b6dac92df6a425fcbc74eef0f01f153100b [file] [log] [blame]
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 Brown3092f802013-03-24 23:05:58 +000097 bool poll;
Mark Brown3080de42012-08-21 20:02:03 +010098 unsigned int val;
Mark Browncdabc1c2012-09-08 09:00:59 +080099 int ret;
Mark Brown966cdc92012-06-19 16:34:23 +0100100
101 ret = pm_runtime_get_sync(arizona->dev);
102 if (ret < 0) {
103 dev_err(arizona->dev, "Failed to resume device: %d\n", ret);
104 return IRQ_NONE;
105 }
106
Mark Brown3092f802013-03-24 23:05:58 +0000107 do {
108 poll = false;
Mark Brown3080de42012-08-21 20:02:03 +0100109
Mark Brown3092f802013-03-24 23:05:58 +0000110 /* Always handle the AoD domain */
111 handle_nested_irq(irq_find_mapping(arizona->virq, 0));
112
113 /*
114 * Check if one of the main interrupts is asserted and only
115 * check that domain if it is.
116 */
117 ret = regmap_read(arizona->regmap, ARIZONA_IRQ_PIN_STATUS,
118 &val);
119 if (ret == 0 && val & ARIZONA_IRQ1_STS) {
120 handle_nested_irq(irq_find_mapping(arizona->virq, 1));
121 } else if (ret != 0) {
122 dev_err(arizona->dev,
123 "Failed to read main IRQ status: %d\n", ret);
124 }
125
126 /*
127 * Poll the IRQ pin status to see if we're really done
128 * if the interrupt controller can't do it for us.
129 */
130 if (!arizona->pdata.irq_gpio) {
131 break;
132 } else if (arizona->pdata.irq_flags & IRQF_TRIGGER_RISING &&
133 gpio_get_value_cansleep(arizona->pdata.irq_gpio)) {
134 poll = true;
135 } else if (arizona->pdata.irq_flags & IRQF_TRIGGER_FALLING &&
136 !gpio_get_value_cansleep(arizona->pdata.irq_gpio)) {
137 poll = true;
138 }
139 } while (poll);
Mark Brown966cdc92012-06-19 16:34:23 +0100140
141 pm_runtime_mark_last_busy(arizona->dev);
142 pm_runtime_put_autosuspend(arizona->dev);
143
144 return IRQ_HANDLED;
145}
146
147static void arizona_irq_enable(struct irq_data *data)
148{
149}
150
151static void arizona_irq_disable(struct irq_data *data)
152{
153}
154
155static struct irq_chip arizona_irq_chip = {
156 .name = "arizona",
157 .irq_disable = arizona_irq_disable,
158 .irq_enable = arizona_irq_enable,
159};
160
161static int arizona_irq_map(struct irq_domain *h, unsigned int virq,
162 irq_hw_number_t hw)
163{
164 struct regmap_irq_chip_data *data = h->host_data;
165
166 irq_set_chip_data(virq, data);
167 irq_set_chip_and_handler(virq, &arizona_irq_chip, handle_edge_irq);
168 irq_set_nested_thread(virq, 1);
169
170 /* ARM needs us to explicitly flag the IRQ as valid
171 * and will set them noprobe when we do so. */
172#ifdef CONFIG_ARM
173 set_irq_flags(virq, IRQF_VALID);
174#else
175 irq_set_noprobe(virq);
176#endif
177
178 return 0;
179}
180
181static struct irq_domain_ops arizona_domain_ops = {
182 .map = arizona_irq_map,
183 .xlate = irq_domain_xlate_twocell,
184};
185
186int arizona_irq_init(struct arizona *arizona)
187{
188 int flags = IRQF_ONESHOT;
189 int ret, i;
190 const struct regmap_irq_chip *aod, *irq;
Mark Brown92d80132012-08-07 19:57:53 +0100191 bool ctrlif_error = true;
Mark Brown22c75fe2013-03-24 23:16:56 +0000192 struct irq_data *irq_data;
Mark Brown966cdc92012-06-19 16:34:23 +0100193
194 switch (arizona->type) {
Mark Brown863df8d2012-07-05 20:35:31 +0100195#ifdef CONFIG_MFD_WM5102
Mark Brown966cdc92012-06-19 16:34:23 +0100196 case WM5102:
197 aod = &wm5102_aod;
198 irq = &wm5102_irq;
Mark Brown92d80132012-08-07 19:57:53 +0100199
Mark Browne1bfe752012-12-05 11:46:04 +0900200 ctrlif_error = false;
Mark Brown966cdc92012-06-19 16:34:23 +0100201 break;
Mark Brown863df8d2012-07-05 20:35:31 +0100202#endif
Mark Browne102bef2012-07-10 12:37:58 +0100203#ifdef CONFIG_MFD_WM5110
204 case WM5110:
205 aod = &wm5110_aod;
206 irq = &wm5110_irq;
Mark Brown92d80132012-08-07 19:57:53 +0100207
Mark Browne1bfe752012-12-05 11:46:04 +0900208 ctrlif_error = false;
Mark Browne102bef2012-07-10 12:37:58 +0100209 break;
210#endif
Mark Brown966cdc92012-06-19 16:34:23 +0100211 default:
212 BUG_ON("Unknown Arizona class device" == NULL);
213 return -EINVAL;
214 }
215
Mark Brown1816cb32013-01-17 16:54:18 +0900216 /* Disable all wake sources by default */
217 regmap_write(arizona->regmap, ARIZONA_WAKE_CONTROL, 0);
218
Mark Brown22c75fe2013-03-24 23:16:56 +0000219 /* Read the flags from the interrupt controller if not specified */
220 if (!arizona->pdata.irq_flags) {
221 irq_data = irq_get_irq_data(arizona->irq);
222 if (!irq_data) {
223 dev_err(arizona->dev, "Invalid IRQ: %d\n",
224 arizona->irq);
225 return -EINVAL;
226 }
227
228 arizona->pdata.irq_flags = irqd_get_trigger_type(irq_data);
229 switch (arizona->pdata.irq_flags) {
230 case IRQF_TRIGGER_LOW:
231 case IRQF_TRIGGER_HIGH:
232 case IRQF_TRIGGER_RISING:
233 case IRQF_TRIGGER_FALLING:
234 break;
235
236 case IRQ_TYPE_NONE:
237 default:
238 /* Device default */
239 arizona->pdata.irq_flags = IRQF_TRIGGER_LOW;
240 break;
241 }
242 }
Mark Brownf8a09412013-03-22 12:59:33 +0100243
244 if (arizona->pdata.irq_flags & (IRQF_TRIGGER_HIGH |
245 IRQF_TRIGGER_RISING)) {
Mark Brown966cdc92012-06-19 16:34:23 +0100246 ret = regmap_update_bits(arizona->regmap, ARIZONA_IRQ_CTRL_1,
247 ARIZONA_IRQ_POL, 0);
248 if (ret != 0) {
249 dev_err(arizona->dev, "Couldn't set IRQ polarity: %d\n",
250 ret);
251 goto err;
252 }
Mark Brown966cdc92012-06-19 16:34:23 +0100253 }
254
Mark Brownf8a09412013-03-22 12:59:33 +0100255 flags |= arizona->pdata.irq_flags;
256
Mark Brown966cdc92012-06-19 16:34:23 +0100257 /* Allocate a virtual IRQ domain to distribute to the regmap domains */
258 arizona->virq = irq_domain_add_linear(NULL, 2, &arizona_domain_ops,
259 arizona);
260 if (!arizona->virq) {
Mark Brownb7dea5d2012-12-05 11:46:26 +0900261 dev_err(arizona->dev, "Failed to add core IRQ domain\n");
Mark Brown966cdc92012-06-19 16:34:23 +0100262 ret = -EINVAL;
263 goto err;
264 }
265
266 ret = regmap_add_irq_chip(arizona->regmap,
267 irq_create_mapping(arizona->virq, 0),
268 IRQF_ONESHOT, -1, aod,
269 &arizona->aod_irq_chip);
270 if (ret != 0) {
271 dev_err(arizona->dev, "Failed to add AOD IRQs: %d\n", ret);
272 goto err_domain;
273 }
274
275 ret = regmap_add_irq_chip(arizona->regmap,
276 irq_create_mapping(arizona->virq, 1),
277 IRQF_ONESHOT, -1, irq,
278 &arizona->irq_chip);
279 if (ret != 0) {
280 dev_err(arizona->dev, "Failed to add AOD IRQs: %d\n", ret);
281 goto err_aod;
282 }
283
284 /* Make sure the boot done IRQ is unmasked for resumes */
285 i = arizona_map_irq(arizona, ARIZONA_IRQ_BOOT_DONE);
286 ret = request_threaded_irq(i, NULL, arizona_boot_done, IRQF_ONESHOT,
287 "Boot done", arizona);
288 if (ret != 0) {
289 dev_err(arizona->dev, "Failed to request boot done %d: %d\n",
290 arizona->irq, ret);
291 goto err_boot_done;
292 }
293
294 /* Handle control interface errors in the core */
Mark Brown92d80132012-08-07 19:57:53 +0100295 if (ctrlif_error) {
296 i = arizona_map_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR);
297 ret = request_threaded_irq(i, NULL, arizona_ctrlif_err,
298 IRQF_ONESHOT,
299 "Control interface error", arizona);
300 if (ret != 0) {
301 dev_err(arizona->dev,
302 "Failed to request CTRLIF_ERR %d: %d\n",
303 arizona->irq, ret);
304 goto err_ctrlif;
305 }
Mark Brown966cdc92012-06-19 16:34:23 +0100306 }
307
Mark Brown3092f802013-03-24 23:05:58 +0000308 /* Used to emulate edge trigger and to work around broken pinmux */
309 if (arizona->pdata.irq_gpio) {
310 if (gpio_to_irq(arizona->pdata.irq_gpio) != arizona->irq) {
311 dev_warn(arizona->dev, "IRQ %d is not GPIO %d (%d)\n",
312 arizona->irq, arizona->pdata.irq_gpio,
313 gpio_to_irq(arizona->pdata.irq_gpio));
314 arizona->irq = gpio_to_irq(arizona->pdata.irq_gpio);
315 }
316
317 ret = devm_gpio_request_one(arizona->dev,
318 arizona->pdata.irq_gpio,
319 GPIOF_IN, "arizona IRQ");
320 if (ret != 0) {
321 dev_err(arizona->dev,
322 "Failed to request IRQ GPIO %d:: %d\n",
323 arizona->pdata.irq_gpio, ret);
324 arizona->pdata.irq_gpio = 0;
325 }
326 }
327
Mark Brown966cdc92012-06-19 16:34:23 +0100328 ret = request_threaded_irq(arizona->irq, NULL, arizona_irq_thread,
329 flags, "arizona", arizona);
330
331 if (ret != 0) {
Mark Brown7994c662013-03-19 09:51:14 +0000332 dev_err(arizona->dev, "Failed to request primary IRQ %d: %d\n",
Mark Brown966cdc92012-06-19 16:34:23 +0100333 arizona->irq, ret);
334 goto err_main_irq;
335 }
336
337 return 0;
338
339err_main_irq:
340 free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR), arizona);
341err_ctrlif:
342 free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_BOOT_DONE), arizona);
343err_boot_done:
344 regmap_del_irq_chip(irq_create_mapping(arizona->virq, 1),
345 arizona->irq_chip);
346err_aod:
347 regmap_del_irq_chip(irq_create_mapping(arizona->virq, 0),
348 arizona->aod_irq_chip);
349err_domain:
350err:
351 return ret;
352}
353
354int arizona_irq_exit(struct arizona *arizona)
355{
356 free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR), arizona);
357 free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_BOOT_DONE), arizona);
358 regmap_del_irq_chip(irq_create_mapping(arizona->virq, 1),
359 arizona->irq_chip);
360 regmap_del_irq_chip(irq_create_mapping(arizona->virq, 0),
361 arizona->aod_irq_chip);
362 free_irq(arizona->irq, arizona);
363
364 return 0;
365}