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_mark_last_busy(arizona->dev); 156 pm_runtime_put_autosuspend(arizona->dev); 157 158 return IRQ_HANDLED; 159 } 160 161 static void arizona_irq_enable(struct irq_data *data) 162 { 163 } 164 165 static void arizona_irq_disable(struct irq_data *data) 166 { 167 } 168 169 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; 185 186 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 }; 205 206 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 } 430 431 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