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