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