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