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