drivers/mfd/arizona-irq.c

   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 }