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 struct irq_chip arizona_irq_chip = {
 156         .name                   = "arizona",
 157         .irq_disable            = arizona_irq_disable,
 158         .irq_enable             = arizona_irq_enable,
 159 };
 160
 161 static int arizona_irq_map(struct irq_domain *h, unsigned int virq,
 162                               irq_hw_number_t hw)
 163 {
 164         struct regmap_irq_chip_data *data = h->host_data;
 165
 166         irq_set_chip_data(virq, data);
 167         irq_set_chip_and_handler(virq, &arizona_irq_chip, handle_edge_irq);
 168         irq_set_nested_thread(virq, 1);
 169
 170         /* ARM needs us to explicitly flag the IRQ as valid
 171          * and will set them noprobe when we do so. */
 172 #ifdef CONFIG_ARM
 173         set_irq_flags(virq, IRQF_VALID);
 174 #else
 175         irq_set_noprobe(virq);
 176 #endif
 177
 178         return 0;
 179 }
 180
 181 static struct irq_domain_ops arizona_domain_ops = {
 182         .map    = arizona_irq_map,
 183         .xlate  = irq_domain_xlate_twocell,
 184 };
 185
 186 int arizona_irq_init(struct arizona *arizona)
 187 {
 188         int flags = IRQF_ONESHOT;
 189         int ret, i;
 190         const struct regmap_irq_chip *aod, *irq;
 191         bool ctrlif_error = true;
 192         struct irq_data *irq_data;
 193
 194         switch (arizona->type) {
 195 #ifdef CONFIG_MFD_WM5102
 196         case WM5102:
 197                 aod = &wm5102_aod;
 198                 irq = &wm5102_irq;
 199
 200                 ctrlif_error = false;
 201                 break;
 202 #endif
 203 #ifdef CONFIG_MFD_WM5110
 204         case WM5110:
 205                 aod = &wm5110_aod;
 206                 irq = &wm5110_irq;
 207
 208                 ctrlif_error = false;
 209                 break;
 210 #endif
 211         default:
 212                 BUG_ON("Unknown Arizona class device" == NULL);
 213                 return -EINVAL;
 214         }
 215
 216         /* Disable all wake sources by default */
 217         regmap_write(arizona->regmap, ARIZONA_WAKE_CONTROL, 0);
 218
 219         /* Read the flags from the interrupt controller if not specified */
 220         if (!arizona->pdata.irq_flags) {
 221                 irq_data = irq_get_irq_data(arizona->irq);
 222                 if (!irq_data) {
 223                         dev_err(arizona->dev, "Invalid IRQ: %d\n",
 224                                 arizona->irq);
 225                         return -EINVAL;
 226                 }
 227
 228                 arizona->pdata.irq_flags = irqd_get_trigger_type(irq_data);
 229                 switch (arizona->pdata.irq_flags) {
 230                 case IRQF_TRIGGER_LOW:
 231                 case IRQF_TRIGGER_HIGH:
 232                 case IRQF_TRIGGER_RISING:
 233                 case IRQF_TRIGGER_FALLING:
 234                         break;
 235
 236                 case IRQ_TYPE_NONE:
 237                 default:
 238                         /* Device default */
 239                         arizona->pdata.irq_flags = IRQF_TRIGGER_LOW;
 240                         break;
 241                 }
 242         }
 243
 244         if (arizona->pdata.irq_flags & (IRQF_TRIGGER_HIGH |
 245                                         IRQF_TRIGGER_RISING)) {
 246                 ret = regmap_update_bits(arizona->regmap, ARIZONA_IRQ_CTRL_1,
 247                                          ARIZONA_IRQ_POL, 0);
 248                 if (ret != 0) {
 249                         dev_err(arizona->dev, "Couldn't set IRQ polarity: %d\n",
 250                                 ret);
 251                         goto err;
 252                 }
 253         }
 254
 255         flags |= arizona->pdata.irq_flags;
 256
 257         /* Allocate a virtual IRQ domain to distribute to the regmap domains */
 258         arizona->virq = irq_domain_add_linear(NULL, 2, &arizona_domain_ops,
 259                                               arizona);
 260         if (!arizona->virq) {
 261                 dev_err(arizona->dev, "Failed to add core IRQ domain\n");
 262                 ret = -EINVAL;
 263                 goto err;
 264         }
 265
 266         ret = regmap_add_irq_chip(arizona->regmap,
 267                                   irq_create_mapping(arizona->virq, 0),
 268                                   IRQF_ONESHOT, -1, aod,
 269                                   &arizona->aod_irq_chip);
 270         if (ret != 0) {
 271                 dev_err(arizona->dev, "Failed to add AOD IRQs: %d\n", ret);
 272                 goto err_domain;
 273         }
 274
 275         ret = regmap_add_irq_chip(arizona->regmap,
 276                                   irq_create_mapping(arizona->virq, 1),
 277                                   IRQF_ONESHOT, -1, irq,
 278                                   &arizona->irq_chip);
 279         if (ret != 0) {
 280                 dev_err(arizona->dev, "Failed to add AOD IRQs: %d\n", ret);
 281                 goto err_aod;
 282         }
 283
 284         /* Make sure the boot done IRQ is unmasked for resumes */
 285         i = arizona_map_irq(arizona, ARIZONA_IRQ_BOOT_DONE);
 286         ret = request_threaded_irq(i, NULL, arizona_boot_done, IRQF_ONESHOT,
 287                                    "Boot done", arizona);
 288         if (ret != 0) {
 289                 dev_err(arizona->dev, "Failed to request boot done %d: %d\n",
 290                         arizona->irq, ret);
 291                 goto err_boot_done;
 292         }
 293
 294         /* Handle control interface errors in the core */
 295         if (ctrlif_error) {
 296                 i = arizona_map_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR);
 297                 ret = request_threaded_irq(i, NULL, arizona_ctrlif_err,
 298                                            IRQF_ONESHOT,
 299                                            "Control interface error", arizona);
 300                 if (ret != 0) {
 301                         dev_err(arizona->dev,
 302                                 "Failed to request CTRLIF_ERR %d: %d\n",
 303                                 arizona->irq, ret);
 304                         goto err_ctrlif;
 305                 }
 306         }
 307
 308         /* Used to emulate edge trigger and to work around broken pinmux */
 309         if (arizona->pdata.irq_gpio) {
 310                 if (gpio_to_irq(arizona->pdata.irq_gpio) != arizona->irq) {
 311                         dev_warn(arizona->dev, "IRQ %d is not GPIO %d (%d)\n",
 312                                  arizona->irq, arizona->pdata.irq_gpio,
 313                                  gpio_to_irq(arizona->pdata.irq_gpio));
 314                         arizona->irq = gpio_to_irq(arizona->pdata.irq_gpio);
 315                 }
 316
 317                 ret = devm_gpio_request_one(arizona->dev,
 318                                             arizona->pdata.irq_gpio,
 319                                             GPIOF_IN, "arizona IRQ");
 320                 if (ret != 0) {
 321                         dev_err(arizona->dev,
 322                                 "Failed to request IRQ GPIO %d:: %d\n",
 323                                 arizona->pdata.irq_gpio, ret);
 324                         arizona->pdata.irq_gpio = 0;
 325                 }
 326         }
 327
 328         ret = request_threaded_irq(arizona->irq, NULL, arizona_irq_thread,
 329                                    flags, "arizona", arizona);
 330
 331         if (ret != 0) {
 332                 dev_err(arizona->dev, "Failed to request primary IRQ %d: %d\n",
 333                         arizona->irq, ret);
 334                 goto err_main_irq;
 335         }
 336
 337         return 0;
 338
 339 err_main_irq:
 340         free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR), arizona);
 341 err_ctrlif:
 342         free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_BOOT_DONE), arizona);
 343 err_boot_done:
 344         regmap_del_irq_chip(irq_create_mapping(arizona->virq, 1),
 345                             arizona->irq_chip);
 346 err_aod:
 347         regmap_del_irq_chip(irq_create_mapping(arizona->virq, 0),
 348                             arizona->aod_irq_chip);
 349 err_domain:
 350 err:
 351         return ret;
 352 }
 353
 354 int arizona_irq_exit(struct arizona *arizona)
 355 {
 356         free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR), arizona);
 357         free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_BOOT_DONE), arizona);
 358         regmap_del_irq_chip(irq_create_mapping(arizona->virq, 1),
 359                             arizona->irq_chip);
 360         regmap_del_irq_chip(irq_create_mapping(arizona->virq, 0),
 361                             arizona->aod_irq_chip);
 362         free_irq(arizona->irq, arizona);
 363
 364         return 0;
 365 }