1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Arizona interrupt support
4 *
5 * Copyright 2012 Wolfson Microelectronics plc
6 *
7 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
8 */
9
10 #include <linux/delay.h>
11 #include <linux/gpio.h>
12 #include <linux/interrupt.h>
13 #include <linux/irq.h>
14 #include <linux/irqdomain.h>
15 #include <linux/module.h>
16 #include <linux/pm_runtime.h>
17 #include <linux/regmap.h>
18 #include <linux/regulator/consumer.h>
19 #include <linux/slab.h>
20
21 #include <linux/mfd/arizona/core.h>
22 #include <linux/mfd/arizona/registers.h>
23
24 #include "arizona.h"
25
26 #define ARIZONA_AOD_IRQ_INDEX 0
27 #define ARIZONA_MAIN_IRQ_INDEX 1
28
arizona_map_irq(struct arizona * arizona,int irq)29 static int arizona_map_irq(struct arizona *arizona, int irq)
30 {
31 int ret;
32
33 if (arizona->aod_irq_chip) {
34 ret = regmap_irq_get_virq(arizona->aod_irq_chip, irq);
35 if (ret >= 0)
36 return ret;
37 }
38
39 return regmap_irq_get_virq(arizona->irq_chip, irq);
40 }
41
arizona_request_irq(struct arizona * arizona,int irq,char * name,irq_handler_t handler,void * data)42 int arizona_request_irq(struct arizona *arizona, int irq, char *name,
43 irq_handler_t handler, void *data)
44 {
45 irq = arizona_map_irq(arizona, irq);
46 if (irq < 0)
47 return irq;
48
49 return request_threaded_irq(irq, NULL, handler, IRQF_ONESHOT,
50 name, data);
51 }
52 EXPORT_SYMBOL_GPL(arizona_request_irq);
53
arizona_free_irq(struct arizona * arizona,int irq,void * data)54 void arizona_free_irq(struct arizona *arizona, int irq, void *data)
55 {
56 irq = arizona_map_irq(arizona, irq);
57 if (irq < 0)
58 return;
59
60 free_irq(irq, data);
61 }
62 EXPORT_SYMBOL_GPL(arizona_free_irq);
63
arizona_set_irq_wake(struct arizona * arizona,int irq,int on)64 int arizona_set_irq_wake(struct arizona *arizona, int irq, int on)
65 {
66 irq = arizona_map_irq(arizona, irq);
67 if (irq < 0)
68 return irq;
69
70 return irq_set_irq_wake(irq, on);
71 }
72 EXPORT_SYMBOL_GPL(arizona_set_irq_wake);
73
arizona_boot_done(int irq,void * data)74 static irqreturn_t arizona_boot_done(int irq, void *data)
75 {
76 struct arizona *arizona = data;
77
78 dev_dbg(arizona->dev, "Boot done\n");
79
80 return IRQ_HANDLED;
81 }
82
arizona_ctrlif_err(int irq,void * data)83 static irqreturn_t arizona_ctrlif_err(int irq, void *data)
84 {
85 struct arizona *arizona = data;
86
87 /*
88 * For pretty much all potential sources a register cache sync
89 * won't help, we've just got a software bug somewhere.
90 */
91 dev_err(arizona->dev, "Control interface error\n");
92
93 return IRQ_HANDLED;
94 }
95
arizona_irq_thread(int irq,void * data)96 static irqreturn_t arizona_irq_thread(int irq, void *data)
97 {
98 struct arizona *arizona = data;
99 bool poll;
100 unsigned int val;
101 int ret;
102
103 ret = pm_runtime_resume_and_get(arizona->dev);
104 if (ret < 0) {
105 dev_err(arizona->dev, "Failed to resume device: %d\n", ret);
106 return IRQ_NONE;
107 }
108
109 do {
110 poll = false;
111
112 if (arizona->aod_irq_chip) {
113 /*
114 * Check the AOD status register to determine whether
115 * the nested IRQ handler should be called.
116 */
117 ret = regmap_read(arizona->regmap,
118 ARIZONA_AOD_IRQ1, &val);
119 if (ret)
120 dev_warn(arizona->dev,
121 "Failed to read AOD IRQ1 %d\n", ret);
122 else if (val)
123 handle_nested_irq(
124 irq_find_mapping(arizona->virq, 0));
125 }
126
127 /*
128 * Check if one of the main interrupts is asserted and only
129 * check that domain if it is.
130 */
131 ret = regmap_read(arizona->regmap, ARIZONA_IRQ_PIN_STATUS,
132 &val);
133 if (ret == 0 && val & ARIZONA_IRQ1_STS) {
134 handle_nested_irq(irq_find_mapping(arizona->virq, 1));
135 } else if (ret != 0) {
136 dev_err(arizona->dev,
137 "Failed to read main IRQ status: %d\n", ret);
138 }
139
140 /*
141 * Poll the IRQ pin status to see if we're really done
142 * if the interrupt controller can't do it for us.
143 */
144 if (!arizona->pdata.irq_gpio) {
145 break;
146 } else if (arizona->pdata.irq_flags & IRQF_TRIGGER_RISING &&
147 gpio_get_value_cansleep(arizona->pdata.irq_gpio)) {
148 poll = true;
149 } else if (arizona->pdata.irq_flags & IRQF_TRIGGER_FALLING &&
150 !gpio_get_value_cansleep(arizona->pdata.irq_gpio)) {
151 poll = true;
152 }
153 } while (poll);
154
155 pm_runtime_mark_last_busy(arizona->dev);
156 pm_runtime_put_autosuspend(arizona->dev);
157
158 return IRQ_HANDLED;
159 }
160
arizona_irq_enable(struct irq_data * data)161 static void arizona_irq_enable(struct irq_data *data)
162 {
163 }
164
arizona_irq_disable(struct irq_data * data)165 static void arizona_irq_disable(struct irq_data *data)
166 {
167 }
168
arizona_irq_set_wake(struct irq_data * data,unsigned int on)169 static int arizona_irq_set_wake(struct irq_data *data, unsigned int on)
170 {
171 struct arizona *arizona = irq_data_get_irq_chip_data(data);
172
173 return irq_set_irq_wake(arizona->irq, on);
174 }
175
176 static struct irq_chip arizona_irq_chip = {
177 .name = "arizona",
178 .irq_disable = arizona_irq_disable,
179 .irq_enable = arizona_irq_enable,
180 .irq_set_wake = arizona_irq_set_wake,
181 };
182
183 static struct lock_class_key arizona_irq_lock_class;
184 static struct lock_class_key arizona_irq_request_class;
185
arizona_irq_map(struct irq_domain * h,unsigned int virq,irq_hw_number_t hw)186 static int arizona_irq_map(struct irq_domain *h, unsigned int virq,
187 irq_hw_number_t hw)
188 {
189 struct arizona *data = h->host_data;
190
191 irq_set_chip_data(virq, data);
192 irq_set_lockdep_class(virq, &arizona_irq_lock_class,
193 &arizona_irq_request_class);
194 irq_set_chip_and_handler(virq, &arizona_irq_chip, handle_simple_irq);
195 irq_set_nested_thread(virq, 1);
196 irq_set_noprobe(virq);
197
198 return 0;
199 }
200
201 static const struct irq_domain_ops arizona_domain_ops = {
202 .map = arizona_irq_map,
203 .xlate = irq_domain_xlate_twocell,
204 };
205
arizona_irq_init(struct arizona * arizona)206 int arizona_irq_init(struct arizona *arizona)
207 {
208 int flags = IRQF_ONESHOT;
209 int ret;
210 const struct regmap_irq_chip *aod, *irq;
211 struct irq_data *irq_data;
212 unsigned int virq;
213
214 arizona->ctrlif_error = true;
215
216 switch (arizona->type) {
217 #ifdef CONFIG_MFD_WM5102
218 case WM5102:
219 aod = &wm5102_aod;
220 irq = &wm5102_irq;
221
222 arizona->ctrlif_error = false;
223 break;
224 #endif
225 #ifdef CONFIG_MFD_WM5110
226 case WM5110:
227 case WM8280:
228 aod = &wm5110_aod;
229
230 switch (arizona->rev) {
231 case 0 ... 2:
232 irq = &wm5110_irq;
233 break;
234 default:
235 irq = &wm5110_revd_irq;
236 break;
237 }
238
239 arizona->ctrlif_error = false;
240 break;
241 #endif
242 #ifdef CONFIG_MFD_CS47L24
243 case WM1831:
244 case CS47L24:
245 aod = NULL;
246 irq = &cs47l24_irq;
247
248 arizona->ctrlif_error = false;
249 break;
250 #endif
251 #ifdef CONFIG_MFD_WM8997
252 case WM8997:
253 aod = &wm8997_aod;
254 irq = &wm8997_irq;
255
256 arizona->ctrlif_error = false;
257 break;
258 #endif
259 #ifdef CONFIG_MFD_WM8998
260 case WM8998:
261 case WM1814:
262 aod = &wm8998_aod;
263 irq = &wm8998_irq;
264
265 arizona->ctrlif_error = false;
266 break;
267 #endif
268 default:
269 BUG_ON("Unknown Arizona class device" == NULL);
270 return -EINVAL;
271 }
272
273 /* Disable all wake sources by default */
274 regmap_write(arizona->regmap, ARIZONA_WAKE_CONTROL, 0);
275
276 /* Read the flags from the interrupt controller if not specified */
277 if (!arizona->pdata.irq_flags) {
278 irq_data = irq_get_irq_data(arizona->irq);
279 if (!irq_data) {
280 dev_err(arizona->dev, "Invalid IRQ: %d\n",
281 arizona->irq);
282 return -EINVAL;
283 }
284
285 arizona->pdata.irq_flags = irqd_get_trigger_type(irq_data);
286 switch (arizona->pdata.irq_flags) {
287 case IRQF_TRIGGER_LOW:
288 case IRQF_TRIGGER_HIGH:
289 case IRQF_TRIGGER_RISING:
290 case IRQF_TRIGGER_FALLING:
291 break;
292
293 case IRQ_TYPE_NONE:
294 default:
295 /* Device default */
296 arizona->pdata.irq_flags = IRQF_TRIGGER_LOW;
297 break;
298 }
299 }
300
301 if (arizona->pdata.irq_flags & (IRQF_TRIGGER_HIGH |
302 IRQF_TRIGGER_RISING)) {
303 ret = regmap_update_bits(arizona->regmap, ARIZONA_IRQ_CTRL_1,
304 ARIZONA_IRQ_POL, 0);
305 if (ret != 0) {
306 dev_err(arizona->dev, "Couldn't set IRQ polarity: %d\n",
307 ret);
308 goto err;
309 }
310 }
311
312 flags |= arizona->pdata.irq_flags;
313
314 /* Allocate a virtual IRQ domain to distribute to the regmap domains */
315 arizona->virq = irq_domain_add_linear(NULL, 2, &arizona_domain_ops,
316 arizona);
317 if (!arizona->virq) {
318 dev_err(arizona->dev, "Failed to add core IRQ domain\n");
319 ret = -EINVAL;
320 goto err;
321 }
322
323 if (aod) {
324 virq = irq_create_mapping(arizona->virq, ARIZONA_AOD_IRQ_INDEX);
325 if (!virq) {
326 dev_err(arizona->dev, "Failed to map AOD IRQs\n");
327 ret = -EINVAL;
328 goto err_domain;
329 }
330
331 ret = regmap_add_irq_chip(arizona->regmap, virq, IRQF_ONESHOT,
332 0, aod, &arizona->aod_irq_chip);
333 if (ret != 0) {
334 dev_err(arizona->dev,
335 "Failed to add AOD IRQs: %d\n", ret);
336 goto err_map_aod;
337 }
338 }
339
340 virq = irq_create_mapping(arizona->virq, ARIZONA_MAIN_IRQ_INDEX);
341 if (!virq) {
342 dev_err(arizona->dev, "Failed to map main IRQs\n");
343 ret = -EINVAL;
344 goto err_aod;
345 }
346
347 ret = regmap_add_irq_chip(arizona->regmap, virq, IRQF_ONESHOT,
348 0, irq, &arizona->irq_chip);
349 if (ret != 0) {
350 dev_err(arizona->dev, "Failed to add main IRQs: %d\n", ret);
351 goto err_map_main_irq;
352 }
353
354 /* Used to emulate edge trigger and to work around broken pinmux */
355 if (arizona->pdata.irq_gpio) {
356 if (gpio_to_irq(arizona->pdata.irq_gpio) != arizona->irq) {
357 dev_warn(arizona->dev, "IRQ %d is not GPIO %d (%d)\n",
358 arizona->irq, arizona->pdata.irq_gpio,
359 gpio_to_irq(arizona->pdata.irq_gpio));
360 arizona->irq = gpio_to_irq(arizona->pdata.irq_gpio);
361 }
362
363 ret = devm_gpio_request_one(arizona->dev,
364 arizona->pdata.irq_gpio,
365 GPIOF_IN, "arizona IRQ");
366 if (ret != 0) {
367 dev_err(arizona->dev,
368 "Failed to request IRQ GPIO %d:: %d\n",
369 arizona->pdata.irq_gpio, ret);
370 arizona->pdata.irq_gpio = 0;
371 }
372 }
373
374 ret = request_threaded_irq(arizona->irq, NULL, arizona_irq_thread,
375 flags, "arizona", arizona);
376
377 if (ret != 0) {
378 dev_err(arizona->dev, "Failed to request primary IRQ %d: %d\n",
379 arizona->irq, ret);
380 goto err_main_irq;
381 }
382
383 /* Make sure the boot done IRQ is unmasked for resumes */
384 ret = arizona_request_irq(arizona, ARIZONA_IRQ_BOOT_DONE, "Boot done",
385 arizona_boot_done, arizona);
386 if (ret != 0) {
387 dev_err(arizona->dev, "Failed to request boot done %d: %d\n",
388 arizona->irq, ret);
389 goto err_boot_done;
390 }
391
392 /* Handle control interface errors in the core */
393 if (arizona->ctrlif_error) {
394 ret = arizona_request_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR,
395 "Control interface error",
396 arizona_ctrlif_err, arizona);
397 if (ret != 0) {
398 dev_err(arizona->dev,
399 "Failed to request CTRLIF_ERR %d: %d\n",
400 arizona->irq, ret);
401 goto err_ctrlif;
402 }
403 }
404
405 return 0;
406
407 err_ctrlif:
408 arizona_free_irq(arizona, ARIZONA_IRQ_BOOT_DONE, arizona);
409 err_boot_done:
410 free_irq(arizona->irq, arizona);
411 err_main_irq:
412 regmap_del_irq_chip(irq_find_mapping(arizona->virq,
413 ARIZONA_MAIN_IRQ_INDEX),
414 arizona->irq_chip);
415 err_map_main_irq:
416 irq_dispose_mapping(irq_find_mapping(arizona->virq,
417 ARIZONA_MAIN_IRQ_INDEX));
418 err_aod:
419 regmap_del_irq_chip(irq_find_mapping(arizona->virq,
420 ARIZONA_AOD_IRQ_INDEX),
421 arizona->aod_irq_chip);
422 err_map_aod:
423 irq_dispose_mapping(irq_find_mapping(arizona->virq,
424 ARIZONA_AOD_IRQ_INDEX));
425 err_domain:
426 irq_domain_remove(arizona->virq);
427 err:
428 return ret;
429 }
430
arizona_irq_exit(struct arizona * arizona)431 int arizona_irq_exit(struct arizona *arizona)
432 {
433 unsigned int virq;
434
435 if (arizona->ctrlif_error)
436 arizona_free_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR, arizona);
437 arizona_free_irq(arizona, ARIZONA_IRQ_BOOT_DONE, arizona);
438
439 virq = irq_find_mapping(arizona->virq, ARIZONA_MAIN_IRQ_INDEX);
440 regmap_del_irq_chip(virq, arizona->irq_chip);
441 irq_dispose_mapping(virq);
442
443 virq = irq_find_mapping(arizona->virq, ARIZONA_AOD_IRQ_INDEX);
444 regmap_del_irq_chip(virq, arizona->aod_irq_chip);
445 irq_dispose_mapping(virq);
446
447 irq_domain_remove(arizona->virq);
448
449 free_irq(arizona->irq, arizona);
450
451 return 0;
452 }
453