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         ret = regmap_irq_get_virq(arizona->aod_irq_chip, irq);
  34         if (ret < 0)
  35                 ret = regmap_irq_get_virq(arizona->irq_chip, irq);
  36
  37         return ret;
  38 }
  39
  40 int arizona_request_irq(struct arizona *arizona, int irq, char *name,
  41                            irq_handler_t handler, void *data)
  42 {
  43         irq = arizona_map_irq(arizona, irq);
  44         if (irq < 0)
  45                 return irq;
  46
  47         return request_threaded_irq(irq, NULL, handler, IRQF_ONESHOT,
  48                                     name, data);
  49 }
  50 EXPORT_SYMBOL_GPL(arizona_request_irq);
  51
  52 void arizona_free_irq(struct arizona *arizona, int irq, void *data)
  53 {
  54         irq = arizona_map_irq(arizona, irq);
  55         if (irq < 0)
  56                 return;
  57
  58         free_irq(irq, data);
  59 }
  60 EXPORT_SYMBOL_GPL(arizona_free_irq);
  61
  62 int arizona_set_irq_wake(struct arizona *arizona, int irq, int on)
  63 {
  64         irq = arizona_map_irq(arizona, irq);
  65         if (irq < 0)
  66                 return irq;
  67
  68         return irq_set_irq_wake(irq, on);
  69 }
  70 EXPORT_SYMBOL_GPL(arizona_set_irq_wake);
  71
  72 static irqreturn_t arizona_boot_done(int irq, void *data)
  73 {
  74         struct arizona *arizona = data;
  75
  76         dev_dbg(arizona->dev, "Boot done\n");
  77
  78         return IRQ_HANDLED;
  79 }
  80
  81 static irqreturn_t arizona_ctrlif_err(int irq, void *data)
  82 {
  83         struct arizona *arizona = data;
  84
  85         /*
  86          * For pretty much all potential sources a register cache sync
  87          * won't help, we've just got a software bug somewhere.
  88          */
  89         dev_err(arizona->dev, "Control interface error\n");
  90
  91         return IRQ_HANDLED;
  92 }
  93
  94 static irqreturn_t arizona_irq_thread(int irq, void *data)
  95 {
  96         struct arizona *arizona = data;
  97         bool poll;
  98         unsigned int val;
  99         int ret;
 100
 101         ret = pm_runtime_get_sync(arizona->dev);
 102         if (ret < 0) {
 103                 dev_err(arizona->dev, "Failed to resume device: %d\n", ret);
 104                 return IRQ_NONE;
 105         }
 106
 107         do {
 108                 poll = false;
 109
 110                 /* Always handle the AoD domain */
 111                 handle_nested_irq(irq_find_mapping(arizona->virq, 0));
 112
 113                 /*
 114                  * Check if one of the main interrupts is asserted and only
 115                  * check that domain if it is.
 116                  */
 117                 ret = regmap_read(arizona->regmap, ARIZONA_IRQ_PIN_STATUS,
 118                                   &val);
 119                 if (ret == 0 && val & ARIZONA_IRQ1_STS) {
 120                         handle_nested_irq(irq_find_mapping(arizona->virq, 1));
 121                 } else if (ret != 0) {
 122                         dev_err(arizona->dev,
 123                                 "Failed to read main IRQ status: %d\n", ret);
 124                 }
 125
 126                 /*
 127                  * Poll the IRQ pin status to see if we're really done
 128                  * if the interrupt controller can't do it for us.
 129                  */
 130                 if (!arizona->pdata.irq_gpio) {
 131                         break;
 132                 } else if (arizona->pdata.irq_flags & IRQF_TRIGGER_RISING &&
 133                            gpio_get_value_cansleep(arizona->pdata.irq_gpio)) {
 134                         poll = true;
 135                 } else if (arizona->pdata.irq_flags & IRQF_TRIGGER_FALLING &&
 136                            !gpio_get_value_cansleep(arizona->pdata.irq_gpio)) {
 137                         poll = true;
 138                 }
 139         } while (poll);
 140
 141         pm_runtime_mark_last_busy(arizona->dev);
 142         pm_runtime_put_autosuspend(arizona->dev);
 143
 144         return IRQ_HANDLED;
 145 }
 146
 147 static void arizona_irq_enable(struct irq_data *data)
 148 {
 149 }
 150
 151 static void arizona_irq_disable(struct irq_data *data)
 152 {
 153 }
 154
 155 static int arizona_irq_set_wake(struct irq_data *data, unsigned int on)
 156 {
 157         struct arizona *arizona = irq_data_get_irq_chip_data(data);
 158
 159         return irq_set_irq_wake(arizona->irq, on);
 160 }
 161
 162 static struct irq_chip arizona_irq_chip = {
 163         .name                   = "arizona",
 164         .irq_disable            = arizona_irq_disable,
 165         .irq_enable             = arizona_irq_enable,
 166         .irq_set_wake           = arizona_irq_set_wake,
 167 };
 168
 169 static int arizona_irq_map(struct irq_domain *h, unsigned int virq,
 170                               irq_hw_number_t hw)
 171 {
 172         struct arizona *data = h->host_data;
 173
 174         irq_set_chip_data(virq, data);
 175         irq_set_chip_and_handler(virq, &arizona_irq_chip, handle_simple_irq);
 176         irq_set_nested_thread(virq, 1);
 177         irq_set_noprobe(virq);
 178
 179         return 0;
 180 }
 181
 182 static const struct irq_domain_ops arizona_domain_ops = {
 183         .map    = arizona_irq_map,
 184         .xlate  = irq_domain_xlate_twocell,
 185 };
 186
 187 int arizona_irq_init(struct arizona *arizona)
 188 {
 189         int flags = IRQF_ONESHOT;
 190         int ret, i;
 191         const struct regmap_irq_chip *aod, *irq;
 192         struct irq_data *irq_data;
 193
 194         arizona->ctrlif_error = true;
 195
 196         switch (arizona->type) {
 197 #ifdef CONFIG_MFD_WM5102
 198         case WM5102:
 199                 aod = &wm5102_aod;
 200                 irq = &wm5102_irq;
 201
 202                 arizona->ctrlif_error = false;
 203                 break;
 204 #endif
 205 #ifdef CONFIG_MFD_WM5110
 206         case WM5110:
 207         case WM8280:
 208                 aod = &wm5110_aod;
 209
 210                 switch (arizona->rev) {
 211                 case 0 ... 2:
 212                         irq = &wm5110_irq;
 213                         break;
 214                 default:
 215                         irq = &wm5110_revd_irq;
 216                         break;
 217                 }
 218
 219                 arizona->ctrlif_error = false;
 220                 break;
 221 #endif
 222 #ifdef CONFIG_MFD_WM8997
 223         case WM8997:
 224                 aod = &wm8997_aod;
 225                 irq = &wm8997_irq;
 226
 227                 arizona->ctrlif_error = false;
 228                 break;
 229 #endif
 230 #ifdef CONFIG_MFD_WM8998
 231         case WM8998:
 232         case WM1814:
 233                 aod = &wm8998_aod;
 234                 irq = &wm8998_irq;
 235
 236                 arizona->ctrlif_error = false;
 237                 break;
 238 #endif
 239         default:
 240                 BUG_ON("Unknown Arizona class device" == NULL);
 241                 return -EINVAL;
 242         }
 243
 244         /* Disable all wake sources by default */
 245         regmap_write(arizona->regmap, ARIZONA_WAKE_CONTROL, 0);
 246
 247         /* Read the flags from the interrupt controller if not specified */
 248         if (!arizona->pdata.irq_flags) {
 249                 irq_data = irq_get_irq_data(arizona->irq);
 250                 if (!irq_data) {
 251                         dev_err(arizona->dev, "Invalid IRQ: %d\n",
 252                                 arizona->irq);
 253                         return -EINVAL;
 254                 }
 255
 256                 arizona->pdata.irq_flags = irqd_get_trigger_type(irq_data);
 257                 switch (arizona->pdata.irq_flags) {
 258                 case IRQF_TRIGGER_LOW:
 259                 case IRQF_TRIGGER_HIGH:
 260                 case IRQF_TRIGGER_RISING:
 261                 case IRQF_TRIGGER_FALLING:
 262                         break;
 263
 264                 case IRQ_TYPE_NONE:
 265                 default:
 266                         /* Device default */
 267                         arizona->pdata.irq_flags = IRQF_TRIGGER_LOW;
 268                         break;
 269                 }
 270         }
 271
 272         if (arizona->pdata.irq_flags & (IRQF_TRIGGER_HIGH |
 273                                         IRQF_TRIGGER_RISING)) {
 274                 ret = regmap_update_bits(arizona->regmap, ARIZONA_IRQ_CTRL_1,
 275                                          ARIZONA_IRQ_POL, 0);
 276                 if (ret != 0) {
 277                         dev_err(arizona->dev, "Couldn't set IRQ polarity: %d\n",
 278                                 ret);
 279                         goto err;
 280                 }
 281         }
 282
 283         flags |= arizona->pdata.irq_flags;
 284
 285         /* Allocate a virtual IRQ domain to distribute to the regmap domains */
 286         arizona->virq = irq_domain_add_linear(NULL, 2, &arizona_domain_ops,
 287                                               arizona);
 288         if (!arizona->virq) {
 289                 dev_err(arizona->dev, "Failed to add core IRQ domain\n");
 290                 ret = -EINVAL;
 291                 goto err;
 292         }
 293
 294         ret = regmap_add_irq_chip(arizona->regmap,
 295                                   irq_create_mapping(arizona->virq, 0),
 296                                   IRQF_ONESHOT, 0, aod,
 297                                   &arizona->aod_irq_chip);
 298         if (ret != 0) {
 299                 dev_err(arizona->dev, "Failed to add AOD IRQs: %d\n", ret);
 300                 goto err_domain;
 301         }
 302
 303         ret = regmap_add_irq_chip(arizona->regmap,
 304                                   irq_create_mapping(arizona->virq, 1),
 305                                   IRQF_ONESHOT, 0, irq,
 306                                   &arizona->irq_chip);
 307         if (ret != 0) {
 308                 dev_err(arizona->dev, "Failed to add main IRQs: %d\n", ret);
 309                 goto err_aod;
 310         }
 311
 312         /* Make sure the boot done IRQ is unmasked for resumes */
 313         i = arizona_map_irq(arizona, ARIZONA_IRQ_BOOT_DONE);
 314         ret = request_threaded_irq(i, NULL, arizona_boot_done, IRQF_ONESHOT,
 315                                    "Boot done", arizona);
 316         if (ret != 0) {
 317                 dev_err(arizona->dev, "Failed to request boot done %d: %d\n",
 318                         arizona->irq, ret);
 319                 goto err_boot_done;
 320         }
 321
 322         /* Handle control interface errors in the core */
 323         if (arizona->ctrlif_error) {
 324                 i = arizona_map_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR);
 325                 ret = request_threaded_irq(i, NULL, arizona_ctrlif_err,
 326                                            IRQF_ONESHOT,
 327                                            "Control interface error", arizona);
 328                 if (ret != 0) {
 329                         dev_err(arizona->dev,
 330                                 "Failed to request CTRLIF_ERR %d: %d\n",
 331                                 arizona->irq, ret);
 332                         goto err_ctrlif;
 333                 }
 334         }
 335
 336         /* Used to emulate edge trigger and to work around broken pinmux */
 337         if (arizona->pdata.irq_gpio) {
 338                 if (gpio_to_irq(arizona->pdata.irq_gpio) != arizona->irq) {
 339                         dev_warn(arizona->dev, "IRQ %d is not GPIO %d (%d)\n",
 340                                  arizona->irq, arizona->pdata.irq_gpio,
 341                                  gpio_to_irq(arizona->pdata.irq_gpio));
 342                         arizona->irq = gpio_to_irq(arizona->pdata.irq_gpio);
 343                 }
 344
 345                 ret = devm_gpio_request_one(arizona->dev,
 346                                             arizona->pdata.irq_gpio,
 347                                             GPIOF_IN, "arizona IRQ");
 348                 if (ret != 0) {
 349                         dev_err(arizona->dev,
 350                                 "Failed to request IRQ GPIO %d:: %d\n",
 351                                 arizona->pdata.irq_gpio, ret);
 352                         arizona->pdata.irq_gpio = 0;
 353                 }
 354         }
 355
 356         ret = request_threaded_irq(arizona->irq, NULL, arizona_irq_thread,
 357                                    flags, "arizona", arizona);
 358
 359         if (ret != 0) {
 360                 dev_err(arizona->dev, "Failed to request primary IRQ %d: %d\n",
 361                         arizona->irq, ret);
 362                 goto err_main_irq;
 363         }
 364
 365         return 0;
 366
 367 err_main_irq:
 368         if (arizona->ctrlif_error)
 369                 free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR),
 370                          arizona);
 371 err_ctrlif:
 372         free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_BOOT_DONE), arizona);
 373 err_boot_done:
 374         regmap_del_irq_chip(irq_create_mapping(arizona->virq, 1),
 375                             arizona->irq_chip);
 376 err_aod:
 377         regmap_del_irq_chip(irq_create_mapping(arizona->virq, 0),
 378                             arizona->aod_irq_chip);
 379 err_domain:
 380 err:
 381         return ret;
 382 }
 383
 384 int arizona_irq_exit(struct arizona *arizona)
 385 {
 386         if (arizona->ctrlif_error)
 387                 free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR),
 388                          arizona);
 389         free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_BOOT_DONE), arizona);
 390         regmap_del_irq_chip(irq_create_mapping(arizona->virq, 1),
 391                             arizona->irq_chip);
 392         regmap_del_irq_chip(irq_create_mapping(arizona->virq, 0),
 393                             arizona->aod_irq_chip);
 394         free_irq(arizona->irq, arizona);
 395
 396         return 0;
 397 }