linux/drivers/mfd/arizona-irq.c
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   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
  29static 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
  40int 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}
  50EXPORT_SYMBOL_GPL(arizona_request_irq);
  51
  52void 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}
  60EXPORT_SYMBOL_GPL(arizona_free_irq);
  61
  62int 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}
  70EXPORT_SYMBOL_GPL(arizona_set_irq_wake);
  71
  72static 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
  81static 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
  94static 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
 147static void arizona_irq_enable(struct irq_data *data)
 148{
 149}
 150
 151static void arizona_irq_disable(struct irq_data *data)
 152{
 153}
 154
 155static struct irq_chip arizona_irq_chip = {
 156        .name                   = "arizona",
 157        .irq_disable            = arizona_irq_disable,
 158        .irq_enable             = arizona_irq_enable,
 159};
 160
 161static 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
 181static struct irq_domain_ops arizona_domain_ops = {
 182        .map    = arizona_irq_map,
 183        .xlate  = irq_domain_xlate_twocell,
 184};
 185
 186int 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
 339err_main_irq:
 340        free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR), arizona);
 341err_ctrlif:
 342        free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_BOOT_DONE), arizona);
 343err_boot_done:
 344        regmap_del_irq_chip(irq_create_mapping(arizona->virq, 1),
 345                            arizona->irq_chip);
 346err_aod:
 347        regmap_del_irq_chip(irq_create_mapping(arizona->virq, 0),
 348                            arizona->aod_irq_chip);
 349err_domain:
 350err:
 351        return ret;
 352}
 353
 354int 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}
 366
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