Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[platform/adaptation/renesas_rcar/renesas_kernel.git] / drivers / mfd / arizona-irq.c
1 /*
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
29 static 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
40 int 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 }
50 EXPORT_SYMBOL_GPL(arizona_request_irq);
51
52 void 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 }
60 EXPORT_SYMBOL_GPL(arizona_free_irq);
61
62 int 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 }
70 EXPORT_SYMBOL_GPL(arizona_set_irq_wake);
71
72 static 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
81 static 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
94 static irqreturn_t arizona_irq_thread(int irq, void *data)
95 {
96         struct arizona *arizona = data;
97         bool poll;
98         unsigned int val;
99         int ret;
100
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
107         do {
108                 poll = false;
109
110                 /* 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);
140
141         pm_runtime_mark_last_busy(arizona->dev);
142         pm_runtime_put_autosuspend(arizona->dev);
143
144         return IRQ_HANDLED;
145 }
146
147 static void arizona_irq_enable(struct irq_data *data)
148 {
149 }
150
151 static void arizona_irq_disable(struct irq_data *data)
152 {
153 }
154
155 static struct irq_chip arizona_irq_chip = {
156         .name                   = "arizona",
157         .irq_disable            = arizona_irq_disable,
158         .irq_enable             = arizona_irq_enable,
159 };
160
161 static 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
181 static struct irq_domain_ops arizona_domain_ops = {
182         .map    = arizona_irq_map,
183         .xlate  = irq_domain_xlate_twocell,
184 };
185
186 int arizona_irq_init(struct arizona *arizona)
187 {
188         int flags = IRQF_ONESHOT;
189         int ret, i;
190         const struct regmap_irq_chip *aod, *irq;
191         bool ctrlif_error = true;
192         struct irq_data *irq_data;
193
194         switch (arizona->type) {
195 #ifdef CONFIG_MFD_WM5102
196         case WM5102:
197                 aod = &wm5102_aod;
198                 irq = &wm5102_irq;
199
200                 ctrlif_error = false;
201                 break;
202 #endif
203 #ifdef CONFIG_MFD_WM5110
204         case WM5110:
205                 aod = &wm5110_aod;
206                 irq = &wm5110_irq;
207
208                 ctrlif_error = false;
209                 break;
210 #endif
211 #ifdef CONFIG_MFD_WM8997
212         case WM8997:
213                 aod = &wm8997_aod;
214                 irq = &wm8997_irq;
215
216                 ctrlif_error = false;
217                 break;
218 #endif
219         default:
220                 BUG_ON("Unknown Arizona class device" == NULL);
221                 return -EINVAL;
222         }
223
224         /* Disable all wake sources by default */
225         regmap_write(arizona->regmap, ARIZONA_WAKE_CONTROL, 0);
226
227         /* Read the flags from the interrupt controller if not specified */
228         if (!arizona->pdata.irq_flags) {
229                 irq_data = irq_get_irq_data(arizona->irq);
230                 if (!irq_data) {
231                         dev_err(arizona->dev, "Invalid IRQ: %d\n",
232                                 arizona->irq);
233                         return -EINVAL;
234                 }
235
236                 arizona->pdata.irq_flags = irqd_get_trigger_type(irq_data);
237                 switch (arizona->pdata.irq_flags) {
238                 case IRQF_TRIGGER_LOW:
239                 case IRQF_TRIGGER_HIGH:
240                 case IRQF_TRIGGER_RISING:
241                 case IRQF_TRIGGER_FALLING:
242                         break;
243
244                 case IRQ_TYPE_NONE:
245                 default:
246                         /* Device default */
247                         arizona->pdata.irq_flags = IRQF_TRIGGER_LOW;
248                         break;
249                 }
250         }
251
252         if (arizona->pdata.irq_flags & (IRQF_TRIGGER_HIGH |
253                                         IRQF_TRIGGER_RISING)) {
254                 ret = regmap_update_bits(arizona->regmap, ARIZONA_IRQ_CTRL_1,
255                                          ARIZONA_IRQ_POL, 0);
256                 if (ret != 0) {
257                         dev_err(arizona->dev, "Couldn't set IRQ polarity: %d\n",
258                                 ret);
259                         goto err;
260                 }
261         }
262
263         flags |= arizona->pdata.irq_flags;
264
265         /* Allocate a virtual IRQ domain to distribute to the regmap domains */
266         arizona->virq = irq_domain_add_linear(NULL, 2, &arizona_domain_ops,
267                                               arizona);
268         if (!arizona->virq) {
269                 dev_err(arizona->dev, "Failed to add core IRQ domain\n");
270                 ret = -EINVAL;
271                 goto err;
272         }
273
274         ret = regmap_add_irq_chip(arizona->regmap,
275                                   irq_create_mapping(arizona->virq, 0),
276                                   IRQF_ONESHOT, -1, aod,
277                                   &arizona->aod_irq_chip);
278         if (ret != 0) {
279                 dev_err(arizona->dev, "Failed to add AOD IRQs: %d\n", ret);
280                 goto err_domain;
281         }
282
283         ret = regmap_add_irq_chip(arizona->regmap,
284                                   irq_create_mapping(arizona->virq, 1),
285                                   IRQF_ONESHOT, -1, irq,
286                                   &arizona->irq_chip);
287         if (ret != 0) {
288                 dev_err(arizona->dev, "Failed to add AOD IRQs: %d\n", ret);
289                 goto err_aod;
290         }
291
292         /* Make sure the boot done IRQ is unmasked for resumes */
293         i = arizona_map_irq(arizona, ARIZONA_IRQ_BOOT_DONE);
294         ret = request_threaded_irq(i, NULL, arizona_boot_done, IRQF_ONESHOT,
295                                    "Boot done", arizona);
296         if (ret != 0) {
297                 dev_err(arizona->dev, "Failed to request boot done %d: %d\n",
298                         arizona->irq, ret);
299                 goto err_boot_done;
300         }
301
302         /* Handle control interface errors in the core */
303         if (ctrlif_error) {
304                 i = arizona_map_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR);
305                 ret = request_threaded_irq(i, NULL, arizona_ctrlif_err,
306                                            IRQF_ONESHOT,
307                                            "Control interface error", arizona);
308                 if (ret != 0) {
309                         dev_err(arizona->dev,
310                                 "Failed to request CTRLIF_ERR %d: %d\n",
311                                 arizona->irq, ret);
312                         goto err_ctrlif;
313                 }
314         }
315
316         /* Used to emulate edge trigger and to work around broken pinmux */
317         if (arizona->pdata.irq_gpio) {
318                 if (gpio_to_irq(arizona->pdata.irq_gpio) != arizona->irq) {
319                         dev_warn(arizona->dev, "IRQ %d is not GPIO %d (%d)\n",
320                                  arizona->irq, arizona->pdata.irq_gpio,
321                                  gpio_to_irq(arizona->pdata.irq_gpio));
322                         arizona->irq = gpio_to_irq(arizona->pdata.irq_gpio);
323                 }
324
325                 ret = devm_gpio_request_one(arizona->dev,
326                                             arizona->pdata.irq_gpio,
327                                             GPIOF_IN, "arizona IRQ");
328                 if (ret != 0) {
329                         dev_err(arizona->dev,
330                                 "Failed to request IRQ GPIO %d:: %d\n",
331                                 arizona->pdata.irq_gpio, ret);
332                         arizona->pdata.irq_gpio = 0;
333                 }
334         }
335
336         ret = request_threaded_irq(arizona->irq, NULL, arizona_irq_thread,
337                                    flags, "arizona", arizona);
338
339         if (ret != 0) {
340                 dev_err(arizona->dev, "Failed to request primary IRQ %d: %d\n",
341                         arizona->irq, ret);
342                 goto err_main_irq;
343         }
344
345         return 0;
346
347 err_main_irq:
348         free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR), arizona);
349 err_ctrlif:
350         free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_BOOT_DONE), arizona);
351 err_boot_done:
352         regmap_del_irq_chip(irq_create_mapping(arizona->virq, 1),
353                             arizona->irq_chip);
354 err_aod:
355         regmap_del_irq_chip(irq_create_mapping(arizona->virq, 0),
356                             arizona->aod_irq_chip);
357 err_domain:
358 err:
359         return ret;
360 }
361
362 int arizona_irq_exit(struct arizona *arizona)
363 {
364         free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR), arizona);
365         free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_BOOT_DONE), arizona);
366         regmap_del_irq_chip(irq_create_mapping(arizona->virq, 1),
367                             arizona->irq_chip);
368         regmap_del_irq_chip(irq_create_mapping(arizona->virq, 0),
369                             arizona->aod_irq_chip);
370         free_irq(arizona->irq, arizona);
371
372         return 0;
373 }