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 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 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 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 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 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 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 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_put_autosuspend(arizona->dev); 156 157 return IRQ_HANDLED; 158 } 159 160 static void arizona_irq_enable(struct irq_data *data) 161 { 162 } 163 164 static void arizona_irq_disable(struct irq_data *data) 165 { 166 } 167 168 static int arizona_irq_set_wake(struct irq_data *data, unsigned int on) 169 { 170 struct arizona *arizona = irq_data_get_irq_chip_data(data); 171 172 return irq_set_irq_wake(arizona->irq, on); 173 } 174 175 static struct irq_chip arizona_irq_chip = { 176 .name = "arizona", 177 .irq_disable = arizona_irq_disable, 178 .irq_enable = arizona_irq_enable, 179 .irq_set_wake = arizona_irq_set_wake, 180 }; 181 182 static struct lock_class_key arizona_irq_lock_class; 183 static struct lock_class_key arizona_irq_request_class; 184 185 static int arizona_irq_map(struct irq_domain *h, unsigned int virq, 186 irq_hw_number_t hw) 187 { 188 struct arizona *data = h->host_data; 189 190 irq_set_chip_data(virq, data); 191 irq_set_lockdep_class(virq, &arizona_irq_lock_class, 192 &arizona_irq_request_class); 193 irq_set_chip_and_handler(virq, &arizona_irq_chip, handle_simple_irq); 194 irq_set_nested_thread(virq, 1); 195 irq_set_noprobe(virq); 196 197 return 0; 198 } 199 200 static const struct irq_domain_ops arizona_domain_ops = { 201 .map = arizona_irq_map, 202 .xlate = irq_domain_xlate_twocell, 203 }; 204 205 int arizona_irq_init(struct arizona *arizona) 206 { 207 int flags = IRQF_ONESHOT; 208 int ret; 209 const struct regmap_irq_chip *aod, *irq; 210 struct irq_data *irq_data; 211 unsigned int virq; 212 213 arizona->ctrlif_error = true; 214 215 switch (arizona->type) { 216 #ifdef CONFIG_MFD_WM5102 217 case WM5102: 218 aod = &wm5102_aod; 219 irq = &wm5102_irq; 220 221 arizona->ctrlif_error = false; 222 break; 223 #endif 224 #ifdef CONFIG_MFD_WM5110 225 case WM5110: 226 case WM8280: 227 aod = &wm5110_aod; 228 229 switch (arizona->rev) { 230 case 0 ... 2: 231 irq = &wm5110_irq; 232 break; 233 default: 234 irq = &wm5110_revd_irq; 235 break; 236 } 237 238 arizona->ctrlif_error = false; 239 break; 240 #endif 241 #ifdef CONFIG_MFD_CS47L24 242 case WM1831: 243 case CS47L24: 244 aod = NULL; 245 irq = &cs47l24_irq; 246 247 arizona->ctrlif_error = false; 248 break; 249 #endif 250 #ifdef CONFIG_MFD_WM8997 251 case WM8997: 252 aod = &wm8997_aod; 253 irq = &wm8997_irq; 254 255 arizona->ctrlif_error = false; 256 break; 257 #endif 258 #ifdef CONFIG_MFD_WM8998 259 case WM8998: 260 case WM1814: 261 aod = &wm8998_aod; 262 irq = &wm8998_irq; 263 264 arizona->ctrlif_error = false; 265 break; 266 #endif 267 default: 268 BUG_ON("Unknown Arizona class device" == NULL); 269 return -EINVAL; 270 } 271 272 /* Disable all wake sources by default */ 273 regmap_write(arizona->regmap, ARIZONA_WAKE_CONTROL, 0); 274 275 /* Read the flags from the interrupt controller if not specified */ 276 if (!arizona->pdata.irq_flags) { 277 irq_data = irq_get_irq_data(arizona->irq); 278 if (!irq_data) { 279 dev_err(arizona->dev, "Invalid IRQ: %d\n", 280 arizona->irq); 281 return -EINVAL; 282 } 283 284 arizona->pdata.irq_flags = irqd_get_trigger_type(irq_data); 285 switch (arizona->pdata.irq_flags) { 286 case IRQF_TRIGGER_LOW: 287 case IRQF_TRIGGER_HIGH: 288 case IRQF_TRIGGER_RISING: 289 case IRQF_TRIGGER_FALLING: 290 break; 291 292 case IRQ_TYPE_NONE: 293 default: 294 /* Device default */ 295 arizona->pdata.irq_flags = IRQF_TRIGGER_LOW; 296 break; 297 } 298 } 299 300 if (arizona->pdata.irq_flags & (IRQF_TRIGGER_HIGH | 301 IRQF_TRIGGER_RISING)) { 302 ret = regmap_update_bits(arizona->regmap, ARIZONA_IRQ_CTRL_1, 303 ARIZONA_IRQ_POL, 0); 304 if (ret != 0) { 305 dev_err(arizona->dev, "Couldn't set IRQ polarity: %d\n", 306 ret); 307 goto err; 308 } 309 } 310 311 flags |= arizona->pdata.irq_flags; 312 313 /* Allocate a virtual IRQ domain to distribute to the regmap domains */ 314 arizona->virq = irq_domain_create_linear(NULL, 2, &arizona_domain_ops, arizona); 315 if (!arizona->virq) { 316 dev_err(arizona->dev, "Failed to add core IRQ domain\n"); 317 ret = -EINVAL; 318 goto err; 319 } 320 321 if (aod) { 322 virq = irq_create_mapping(arizona->virq, ARIZONA_AOD_IRQ_INDEX); 323 if (!virq) { 324 dev_err(arizona->dev, "Failed to map AOD IRQs\n"); 325 ret = -EINVAL; 326 goto err_domain; 327 } 328 329 ret = regmap_add_irq_chip(arizona->regmap, virq, IRQF_ONESHOT, 330 0, aod, &arizona->aod_irq_chip); 331 if (ret != 0) { 332 dev_err(arizona->dev, 333 "Failed to add AOD IRQs: %d\n", ret); 334 goto err_map_aod; 335 } 336 } 337 338 virq = irq_create_mapping(arizona->virq, ARIZONA_MAIN_IRQ_INDEX); 339 if (!virq) { 340 dev_err(arizona->dev, "Failed to map main IRQs\n"); 341 ret = -EINVAL; 342 goto err_aod; 343 } 344 345 ret = regmap_add_irq_chip(arizona->regmap, virq, IRQF_ONESHOT, 346 0, irq, &arizona->irq_chip); 347 if (ret != 0) { 348 dev_err(arizona->dev, "Failed to add main IRQs: %d\n", ret); 349 goto err_map_main_irq; 350 } 351 352 /* Used to emulate edge trigger and to work around broken pinmux */ 353 if (arizona->pdata.irq_gpio) { 354 if (gpio_to_irq(arizona->pdata.irq_gpio) != arizona->irq) { 355 dev_warn(arizona->dev, "IRQ %d is not GPIO %d (%d)\n", 356 arizona->irq, arizona->pdata.irq_gpio, 357 gpio_to_irq(arizona->pdata.irq_gpio)); 358 arizona->irq = gpio_to_irq(arizona->pdata.irq_gpio); 359 } 360 361 ret = devm_gpio_request_one(arizona->dev, 362 arizona->pdata.irq_gpio, 363 GPIOF_IN, "arizona IRQ"); 364 if (ret != 0) { 365 dev_err(arizona->dev, 366 "Failed to request IRQ GPIO %d:: %d\n", 367 arizona->pdata.irq_gpio, ret); 368 arizona->pdata.irq_gpio = 0; 369 } 370 } 371 372 ret = request_threaded_irq(arizona->irq, NULL, arizona_irq_thread, 373 flags, "arizona", arizona); 374 375 if (ret != 0) { 376 dev_err(arizona->dev, "Failed to request primary IRQ %d: %d\n", 377 arizona->irq, ret); 378 goto err_main_irq; 379 } 380 381 /* Make sure the boot done IRQ is unmasked for resumes */ 382 ret = arizona_request_irq(arizona, ARIZONA_IRQ_BOOT_DONE, "Boot done", 383 arizona_boot_done, arizona); 384 if (ret != 0) { 385 dev_err(arizona->dev, "Failed to request boot done %d: %d\n", 386 arizona->irq, ret); 387 goto err_boot_done; 388 } 389 390 /* Handle control interface errors in the core */ 391 if (arizona->ctrlif_error) { 392 ret = arizona_request_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR, 393 "Control interface error", 394 arizona_ctrlif_err, arizona); 395 if (ret != 0) { 396 dev_err(arizona->dev, 397 "Failed to request CTRLIF_ERR %d: %d\n", 398 arizona->irq, ret); 399 goto err_ctrlif; 400 } 401 } 402 403 return 0; 404 405 err_ctrlif: 406 arizona_free_irq(arizona, ARIZONA_IRQ_BOOT_DONE, arizona); 407 err_boot_done: 408 free_irq(arizona->irq, arizona); 409 err_main_irq: 410 regmap_del_irq_chip(irq_find_mapping(arizona->virq, 411 ARIZONA_MAIN_IRQ_INDEX), 412 arizona->irq_chip); 413 err_map_main_irq: 414 irq_dispose_mapping(irq_find_mapping(arizona->virq, 415 ARIZONA_MAIN_IRQ_INDEX)); 416 err_aod: 417 regmap_del_irq_chip(irq_find_mapping(arizona->virq, 418 ARIZONA_AOD_IRQ_INDEX), 419 arizona->aod_irq_chip); 420 err_map_aod: 421 irq_dispose_mapping(irq_find_mapping(arizona->virq, 422 ARIZONA_AOD_IRQ_INDEX)); 423 err_domain: 424 irq_domain_remove(arizona->virq); 425 err: 426 return ret; 427 } 428 429 int arizona_irq_exit(struct arizona *arizona) 430 { 431 unsigned int virq; 432 433 if (arizona->ctrlif_error) 434 arizona_free_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR, arizona); 435 arizona_free_irq(arizona, ARIZONA_IRQ_BOOT_DONE, arizona); 436 437 virq = irq_find_mapping(arizona->virq, ARIZONA_MAIN_IRQ_INDEX); 438 regmap_del_irq_chip(virq, arizona->irq_chip); 439 irq_dispose_mapping(virq); 440 441 virq = irq_find_mapping(arizona->virq, ARIZONA_AOD_IRQ_INDEX); 442 regmap_del_irq_chip(virq, arizona->aod_irq_chip); 443 irq_dispose_mapping(virq); 444 445 irq_domain_remove(arizona->virq); 446 447 free_irq(arizona->irq, arizona); 448 449 return 0; 450 } 451