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 #ifdef CONFIG_MFD_WM8997
 212         case WM8997:
 213                 aod = &wm8997_aod;
 214                 irq = &wm8997_irq;
 215
 216                 ctrlif_error = false;
 217                 break;
 218 #endif
 219         default:
 220                 BUG_ON("Unknown Arizona class device" == NULL);
 221                 return -EINVAL;
 222         }
 223
 224         /* Disable all wake sources by default */
 225         regmap_write(arizona->regmap, ARIZONA_WAKE_CONTROL, 0);
 226
 227         /* Read the flags from the interrupt controller if not specified */
 228         if (!arizona->pdata.irq_flags) {
 229                 irq_data = irq_get_irq_data(arizona->irq);
 230                 if (!irq_data) {
 231                         dev_err(arizona->dev, "Invalid IRQ: %d\n",
 232                                 arizona->irq);
 233                         return -EINVAL;
 234                 }
 235
 236                 arizona->pdata.irq_flags = irqd_get_trigger_type(irq_data);
 237                 switch (arizona->pdata.irq_flags) {
 238                 case IRQF_TRIGGER_LOW:
 239                 case IRQF_TRIGGER_HIGH:
 240                 case IRQF_TRIGGER_RISING:
 241                 case IRQF_TRIGGER_FALLING:
 242                         break;
 243
 244                 case IRQ_TYPE_NONE:
 245                 default:
 246                         /* Device default */
 247                         arizona->pdata.irq_flags = IRQF_TRIGGER_LOW;
 248                         break;
 249                 }
 250         }
 251
 252         if (arizona->pdata.irq_flags & (IRQF_TRIGGER_HIGH |
 253                                         IRQF_TRIGGER_RISING)) {
 254                 ret = regmap_update_bits(arizona->regmap, ARIZONA_IRQ_CTRL_1,
 255                                          ARIZONA_IRQ_POL, 0);
 256                 if (ret != 0) {
 257                         dev_err(arizona->dev, "Couldn't set IRQ polarity: %d\n",
 258                                 ret);
 259                         goto err;
 260                 }
 261         }
 262
 263         flags |= arizona->pdata.irq_flags;
 264
 265         /* Allocate a virtual IRQ domain to distribute to the regmap domains */
 266         arizona->virq = irq_domain_add_linear(NULL, 2, &arizona_domain_ops,
 267                                               arizona);
 268         if (!arizona->virq) {
 269                 dev_err(arizona->dev, "Failed to add core IRQ domain\n");
 270                 ret = -EINVAL;
 271                 goto err;
 272         }
 273
 274         ret = regmap_add_irq_chip(arizona->regmap,
 275                                   irq_create_mapping(arizona->virq, 0),
 276                                   IRQF_ONESHOT, -1, aod,
 277                                   &arizona->aod_irq_chip);
 278         if (ret != 0) {
 279                 dev_err(arizona->dev, "Failed to add AOD IRQs: %d\n", ret);
 280                 goto err_domain;
 281         }
 282
 283         ret = regmap_add_irq_chip(arizona->regmap,
 284                                   irq_create_mapping(arizona->virq, 1),
 285                                   IRQF_ONESHOT, -1, irq,
 286                                   &arizona->irq_chip);
 287         if (ret != 0) {
 288                 dev_err(arizona->dev, "Failed to add AOD IRQs: %d\n", ret);
 289                 goto err_aod;
 290         }
 291
 292         /* Make sure the boot done IRQ is unmasked for resumes */
 293         i = arizona_map_irq(arizona, ARIZONA_IRQ_BOOT_DONE);
 294         ret = request_threaded_irq(i, NULL, arizona_boot_done, IRQF_ONESHOT,
 295                                    "Boot done", arizona);
 296         if (ret != 0) {
 297                 dev_err(arizona->dev, "Failed to request boot done %d: %d\n",
 298                         arizona->irq, ret);
 299                 goto err_boot_done;
 300         }
 301
 302         /* Handle control interface errors in the core */
 303         if (ctrlif_error) {
 304                 i = arizona_map_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR);
 305                 ret = request_threaded_irq(i, NULL, arizona_ctrlif_err,
 306                                            IRQF_ONESHOT,
 307                                            "Control interface error", arizona);
 308                 if (ret != 0) {
 309                         dev_err(arizona->dev,
 310                                 "Failed to request CTRLIF_ERR %d: %d\n",
 311                                 arizona->irq, ret);
 312                         goto err_ctrlif;
 313                 }
 314         }
 315
 316         /* Used to emulate edge trigger and to work around broken pinmux */
 317         if (arizona->pdata.irq_gpio) {
 318                 if (gpio_to_irq(arizona->pdata.irq_gpio) != arizona->irq) {
 319                         dev_warn(arizona->dev, "IRQ %d is not GPIO %d (%d)\n",
 320                                  arizona->irq, arizona->pdata.irq_gpio,
 321                                  gpio_to_irq(arizona->pdata.irq_gpio));
 322                         arizona->irq = gpio_to_irq(arizona->pdata.irq_gpio);
 323                 }
 324
 325                 ret = devm_gpio_request_one(arizona->dev,
 326                                             arizona->pdata.irq_gpio,
 327                                             GPIOF_IN, "arizona IRQ");
 328                 if (ret != 0) {
 329                         dev_err(arizona->dev,
 330                                 "Failed to request IRQ GPIO %d:: %d\n",
 331                                 arizona->pdata.irq_gpio, ret);
 332                         arizona->pdata.irq_gpio = 0;
 333                 }
 334         }
 335
 336         ret = request_threaded_irq(arizona->irq, NULL, arizona_irq_thread,
 337                                    flags, "arizona", arizona);
 338
 339         if (ret != 0) {
 340                 dev_err(arizona->dev, "Failed to request primary IRQ %d: %d\n",
 341                         arizona->irq, ret);
 342                 goto err_main_irq;
 343         }
 344
 345         return 0;
 346
 347 err_main_irq:
 348         free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR), arizona);
 349 err_ctrlif:
 350         free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_BOOT_DONE), arizona);
 351 err_boot_done:
 352         regmap_del_irq_chip(irq_create_mapping(arizona->virq, 1),
 353                             arizona->irq_chip);
 354 err_aod:
 355         regmap_del_irq_chip(irq_create_mapping(arizona->virq, 0),
 356                             arizona->aod_irq_chip);
 357 err_domain:
 358 err:
 359         return ret;
 360 }
 361
 362 int arizona_irq_exit(struct arizona *arizona)
 363 {
 364         free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR), arizona);
 365         free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_BOOT_DONE), arizona);
 366         regmap_del_irq_chip(irq_create_mapping(arizona->virq, 1),
 367                             arizona->irq_chip);
 368         regmap_del_irq_chip(irq_create_mapping(arizona->virq, 0),
 369                             arizona->aod_irq_chip);
 370         free_irq(arizona->irq, arizona);
 371
 372         return 0;
 373 }