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                         /*
 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_find_mapping(arizona->virq, 1),
 402                             arizona->irq_chip);
 403 err_aod:
 404         regmap_del_irq_chip(irq_find_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_find_mapping(arizona->virq, 1),
 417                             arizona->irq_chip);
 418         regmap_del_irq_chip(irq_find_mapping(arizona->virq, 0),
 419                             arizona->aod_irq_chip);
 420         free_irq(arizona->irq, arizona);
 421
 422         return 0;
 423 }