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 handle_nested_irq(irq_find_mapping(arizona->virq, 0)); 114 115 /* 116 * Check if one of the main interrupts is asserted and only 117 * check that domain if it is. 118 */ 119 ret = regmap_read(arizona->regmap, ARIZONA_IRQ_PIN_STATUS, 120 &val); 121 if (ret == 0 && val & ARIZONA_IRQ1_STS) { 122 handle_nested_irq(irq_find_mapping(arizona->virq, 1)); 123 } else if (ret != 0) { 124 dev_err(arizona->dev, 125 "Failed to read main IRQ status: %d\n", ret); 126 } 127 128 /* 129 * Poll the IRQ pin status to see if we're really done 130 * if the interrupt controller can't do it for us. 131 */ 132 if (!arizona->pdata.irq_gpio) { 133 break; 134 } else if (arizona->pdata.irq_flags & IRQF_TRIGGER_RISING && 135 gpio_get_value_cansleep(arizona->pdata.irq_gpio)) { 136 poll = true; 137 } else if (arizona->pdata.irq_flags & IRQF_TRIGGER_FALLING && 138 !gpio_get_value_cansleep(arizona->pdata.irq_gpio)) { 139 poll = true; 140 } 141 } while (poll); 142 143 pm_runtime_mark_last_busy(arizona->dev); 144 pm_runtime_put_autosuspend(arizona->dev); 145 146 return IRQ_HANDLED; 147 } 148 149 static void arizona_irq_enable(struct irq_data *data) 150 { 151 } 152 153 static void arizona_irq_disable(struct irq_data *data) 154 { 155 } 156 157 static int arizona_irq_set_wake(struct irq_data *data, unsigned int on) 158 { 159 struct arizona *arizona = irq_data_get_irq_chip_data(data); 160 161 return irq_set_irq_wake(arizona->irq, on); 162 } 163 164 static struct irq_chip arizona_irq_chip = { 165 .name = "arizona", 166 .irq_disable = arizona_irq_disable, 167 .irq_enable = arizona_irq_enable, 168 .irq_set_wake = arizona_irq_set_wake, 169 }; 170 171 static struct lock_class_key arizona_irq_lock_class; 172 173 static int arizona_irq_map(struct irq_domain *h, unsigned int virq, 174 irq_hw_number_t hw) 175 { 176 struct arizona *data = h->host_data; 177 178 irq_set_chip_data(virq, data); 179 irq_set_lockdep_class(virq, &arizona_irq_lock_class); 180 irq_set_chip_and_handler(virq, &arizona_irq_chip, handle_simple_irq); 181 irq_set_nested_thread(virq, 1); 182 irq_set_noprobe(virq); 183 184 return 0; 185 } 186 187 static const struct irq_domain_ops arizona_domain_ops = { 188 .map = arizona_irq_map, 189 .xlate = irq_domain_xlate_twocell, 190 }; 191 192 int arizona_irq_init(struct arizona *arizona) 193 { 194 int flags = IRQF_ONESHOT; 195 int ret, i; 196 const struct regmap_irq_chip *aod, *irq; 197 struct irq_data *irq_data; 198 199 arizona->ctrlif_error = true; 200 201 switch (arizona->type) { 202 #ifdef CONFIG_MFD_WM5102 203 case WM5102: 204 aod = &wm5102_aod; 205 irq = &wm5102_irq; 206 207 arizona->ctrlif_error = false; 208 break; 209 #endif 210 #ifdef CONFIG_MFD_WM5110 211 case WM5110: 212 case WM8280: 213 aod = &wm5110_aod; 214 215 switch (arizona->rev) { 216 case 0 ... 2: 217 irq = &wm5110_irq; 218 break; 219 default: 220 irq = &wm5110_revd_irq; 221 break; 222 } 223 224 arizona->ctrlif_error = false; 225 break; 226 #endif 227 #ifdef CONFIG_MFD_CS47L24 228 case WM1831: 229 case CS47L24: 230 aod = NULL; 231 irq = &cs47l24_irq; 232 233 arizona->ctrlif_error = false; 234 break; 235 #endif 236 #ifdef CONFIG_MFD_WM8997 237 case WM8997: 238 aod = &wm8997_aod; 239 irq = &wm8997_irq; 240 241 arizona->ctrlif_error = false; 242 break; 243 #endif 244 #ifdef CONFIG_MFD_WM8998 245 case WM8998: 246 case WM1814: 247 aod = &wm8998_aod; 248 irq = &wm8998_irq; 249 250 arizona->ctrlif_error = false; 251 break; 252 #endif 253 default: 254 BUG_ON("Unknown Arizona class device" == NULL); 255 return -EINVAL; 256 } 257 258 /* Disable all wake sources by default */ 259 regmap_write(arizona->regmap, ARIZONA_WAKE_CONTROL, 0); 260 261 /* Read the flags from the interrupt controller if not specified */ 262 if (!arizona->pdata.irq_flags) { 263 irq_data = irq_get_irq_data(arizona->irq); 264 if (!irq_data) { 265 dev_err(arizona->dev, "Invalid IRQ: %d\n", 266 arizona->irq); 267 return -EINVAL; 268 } 269 270 arizona->pdata.irq_flags = irqd_get_trigger_type(irq_data); 271 switch (arizona->pdata.irq_flags) { 272 case IRQF_TRIGGER_LOW: 273 case IRQF_TRIGGER_HIGH: 274 case IRQF_TRIGGER_RISING: 275 case IRQF_TRIGGER_FALLING: 276 break; 277 278 case IRQ_TYPE_NONE: 279 default: 280 /* Device default */ 281 arizona->pdata.irq_flags = IRQF_TRIGGER_LOW; 282 break; 283 } 284 } 285 286 if (arizona->pdata.irq_flags & (IRQF_TRIGGER_HIGH | 287 IRQF_TRIGGER_RISING)) { 288 ret = regmap_update_bits(arizona->regmap, ARIZONA_IRQ_CTRL_1, 289 ARIZONA_IRQ_POL, 0); 290 if (ret != 0) { 291 dev_err(arizona->dev, "Couldn't set IRQ polarity: %d\n", 292 ret); 293 goto err; 294 } 295 } 296 297 flags |= arizona->pdata.irq_flags; 298 299 /* Allocate a virtual IRQ domain to distribute to the regmap domains */ 300 arizona->virq = irq_domain_add_linear(NULL, 2, &arizona_domain_ops, 301 arizona); 302 if (!arizona->virq) { 303 dev_err(arizona->dev, "Failed to add core IRQ domain\n"); 304 ret = -EINVAL; 305 goto err; 306 } 307 308 if (aod) { 309 ret = regmap_add_irq_chip(arizona->regmap, 310 irq_create_mapping(arizona->virq, 0), 311 IRQF_ONESHOT, 0, aod, 312 &arizona->aod_irq_chip); 313 if (ret != 0) { 314 dev_err(arizona->dev, 315 "Failed to add AOD IRQs: %d\n", ret); 316 goto err; 317 } 318 } 319 320 ret = regmap_add_irq_chip(arizona->regmap, 321 irq_create_mapping(arizona->virq, 1), 322 IRQF_ONESHOT, 0, irq, 323 &arizona->irq_chip); 324 if (ret != 0) { 325 dev_err(arizona->dev, "Failed to add main IRQs: %d\n", ret); 326 goto err_aod; 327 } 328 329 /* Used to emulate edge trigger and to work around broken pinmux */ 330 if (arizona->pdata.irq_gpio) { 331 if (gpio_to_irq(arizona->pdata.irq_gpio) != arizona->irq) { 332 dev_warn(arizona->dev, "IRQ %d is not GPIO %d (%d)\n", 333 arizona->irq, arizona->pdata.irq_gpio, 334 gpio_to_irq(arizona->pdata.irq_gpio)); 335 arizona->irq = gpio_to_irq(arizona->pdata.irq_gpio); 336 } 337 338 ret = devm_gpio_request_one(arizona->dev, 339 arizona->pdata.irq_gpio, 340 GPIOF_IN, "arizona IRQ"); 341 if (ret != 0) { 342 dev_err(arizona->dev, 343 "Failed to request IRQ GPIO %d:: %d\n", 344 arizona->pdata.irq_gpio, ret); 345 arizona->pdata.irq_gpio = 0; 346 } 347 } 348 349 ret = request_threaded_irq(arizona->irq, NULL, arizona_irq_thread, 350 flags, "arizona", arizona); 351 352 if (ret != 0) { 353 dev_err(arizona->dev, "Failed to request primary IRQ %d: %d\n", 354 arizona->irq, ret); 355 goto err_main_irq; 356 } 357 358 /* Make sure the boot done IRQ is unmasked for resumes */ 359 i = arizona_map_irq(arizona, ARIZONA_IRQ_BOOT_DONE); 360 ret = request_threaded_irq(i, NULL, arizona_boot_done, IRQF_ONESHOT, 361 "Boot done", arizona); 362 if (ret != 0) { 363 dev_err(arizona->dev, "Failed to request boot done %d: %d\n", 364 arizona->irq, ret); 365 goto err_boot_done; 366 } 367 368 /* Handle control interface errors in the core */ 369 if (arizona->ctrlif_error) { 370 i = arizona_map_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR); 371 ret = request_threaded_irq(i, NULL, arizona_ctrlif_err, 372 IRQF_ONESHOT, 373 "Control interface error", arizona); 374 if (ret != 0) { 375 dev_err(arizona->dev, 376 "Failed to request CTRLIF_ERR %d: %d\n", 377 arizona->irq, ret); 378 goto err_ctrlif; 379 } 380 } 381 382 return 0; 383 384 err_ctrlif: 385 free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_BOOT_DONE), arizona); 386 err_boot_done: 387 free_irq(arizona->irq, arizona); 388 err_main_irq: 389 regmap_del_irq_chip(irq_create_mapping(arizona->virq, 1), 390 arizona->irq_chip); 391 err_aod: 392 regmap_del_irq_chip(irq_create_mapping(arizona->virq, 0), 393 arizona->aod_irq_chip); 394 err: 395 return ret; 396 } 397 398 int arizona_irq_exit(struct arizona *arizona) 399 { 400 if (arizona->ctrlif_error) 401 free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR), 402 arizona); 403 free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_BOOT_DONE), arizona); 404 regmap_del_irq_chip(irq_create_mapping(arizona->virq, 1), 405 arizona->irq_chip); 406 regmap_del_irq_chip(irq_create_mapping(arizona->virq, 0), 407 arizona->aod_irq_chip); 408 free_irq(arizona->irq, arizona); 409 410 return 0; 411 } 412