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        unsigned int val;
  98        int ret;
  99
 100        ret = pm_runtime_get_sync(arizona->dev);
 101        if (ret < 0) {
 102                dev_err(arizona->dev, "Failed to resume device: %d\n", ret);
 103                return IRQ_NONE;
 104        }
 105
 106        /* Always handle the AoD domain */
 107        handle_nested_irq(irq_find_mapping(arizona->virq, 0));
 108
 109        /*
 110         * Check if one of the main interrupts is asserted and only
 111         * check that domain if it is.
 112         */
 113        ret = regmap_read(arizona->regmap, ARIZONA_IRQ_PIN_STATUS, &val);
 114        if (ret == 0 && val & ARIZONA_IRQ1_STS) {
 115                handle_nested_irq(irq_find_mapping(arizona->virq, 1));
 116        } else if (ret != 0) {
 117                dev_err(arizona->dev, "Failed to read main IRQ status: %d\n",
 118                        ret);
 119        }
 120
 121        pm_runtime_mark_last_busy(arizona->dev);
 122        pm_runtime_put_autosuspend(arizona->dev);
 123
 124        return IRQ_HANDLED;
 125}
 126
 127static void arizona_irq_enable(struct irq_data *data)
 128{
 129}
 130
 131static void arizona_irq_disable(struct irq_data *data)
 132{
 133}
 134
 135static struct irq_chip arizona_irq_chip = {
 136        .name                   = "arizona",
 137        .irq_disable            = arizona_irq_disable,
 138        .irq_enable             = arizona_irq_enable,
 139};
 140
 141static int arizona_irq_map(struct irq_domain *h, unsigned int virq,
 142                              irq_hw_number_t hw)
 143{
 144        struct regmap_irq_chip_data *data = h->host_data;
 145
 146        irq_set_chip_data(virq, data);
 147        irq_set_chip_and_handler(virq, &arizona_irq_chip, handle_edge_irq);
 148        irq_set_nested_thread(virq, 1);
 149
 150        /* ARM needs us to explicitly flag the IRQ as valid
 151         * and will set them noprobe when we do so. */
 152#ifdef CONFIG_ARM
 153        set_irq_flags(virq, IRQF_VALID);
 154#else
 155        irq_set_noprobe(virq);
 156#endif
 157
 158        return 0;
 159}
 160
 161static struct irq_domain_ops arizona_domain_ops = {
 162        .map    = arizona_irq_map,
 163        .xlate  = irq_domain_xlate_twocell,
 164};
 165
 166int arizona_irq_init(struct arizona *arizona)
 167{
 168        int flags = IRQF_ONESHOT;
 169        int ret, i;
 170        const struct regmap_irq_chip *aod, *irq;
 171        bool ctrlif_error = true;
 172
 173        switch (arizona->type) {
 174#ifdef CONFIG_MFD_WM5102
 175        case WM5102:
 176                aod = &wm5102_aod;
 177                irq = &wm5102_irq;
 178
 179                switch (arizona->rev) {
 180                case 0:
 181                case 1:
 182                        ctrlif_error = false;
 183                        break;
 184                default:
 185                        break;
 186                }
 187                break;
 188#endif
 189#ifdef CONFIG_MFD_WM5110
 190        case WM5110:
 191                aod = &wm5110_aod;
 192                irq = &wm5110_irq;
 193
 194                switch (arizona->rev) {
 195                case 0:
 196                case 1:
 197                        ctrlif_error = false;
 198                        break;
 199                default:
 200                        break;
 201                }
 202                break;
 203#endif
 204        default:
 205                BUG_ON("Unknown Arizona class device" == NULL);
 206                return -EINVAL;
 207        }
 208
 209        if (arizona->pdata.irq_active_high) {
 210                ret = regmap_update_bits(arizona->regmap, ARIZONA_IRQ_CTRL_1,
 211                                         ARIZONA_IRQ_POL, 0);
 212                if (ret != 0) {
 213                        dev_err(arizona->dev, "Couldn't set IRQ polarity: %d\n",
 214                                ret);
 215                        goto err;
 216                }
 217
 218                flags |= IRQF_TRIGGER_HIGH;
 219        } else {
 220                flags |= IRQF_TRIGGER_LOW;
 221        }
 222
 223        /* Allocate a virtual IRQ domain to distribute to the regmap domains */
 224        arizona->virq = irq_domain_add_linear(NULL, 2, &arizona_domain_ops,
 225                                              arizona);
 226        if (!arizona->virq) {
 227                ret = -EINVAL;
 228                goto err;
 229        }
 230
 231        ret = regmap_add_irq_chip(arizona->regmap,
 232                                  irq_create_mapping(arizona->virq, 0),
 233                                  IRQF_ONESHOT, -1, aod,
 234                                  &arizona->aod_irq_chip);
 235        if (ret != 0) {
 236                dev_err(arizona->dev, "Failed to add AOD IRQs: %d\n", ret);
 237                goto err_domain;
 238        }
 239
 240        ret = regmap_add_irq_chip(arizona->regmap,
 241                                  irq_create_mapping(arizona->virq, 1),
 242                                  IRQF_ONESHOT, -1, irq,
 243                                  &arizona->irq_chip);
 244        if (ret != 0) {
 245                dev_err(arizona->dev, "Failed to add AOD IRQs: %d\n", ret);
 246                goto err_aod;
 247        }
 248
 249        /* Make sure the boot done IRQ is unmasked for resumes */
 250        i = arizona_map_irq(arizona, ARIZONA_IRQ_BOOT_DONE);
 251        ret = request_threaded_irq(i, NULL, arizona_boot_done, IRQF_ONESHOT,
 252                                   "Boot done", arizona);
 253        if (ret != 0) {
 254                dev_err(arizona->dev, "Failed to request boot done %d: %d\n",
 255                        arizona->irq, ret);
 256                goto err_boot_done;
 257        }
 258
 259        /* Handle control interface errors in the core */
 260        if (ctrlif_error) {
 261                i = arizona_map_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR);
 262                ret = request_threaded_irq(i, NULL, arizona_ctrlif_err,
 263                                           IRQF_ONESHOT,
 264                                           "Control interface error", arizona);
 265                if (ret != 0) {
 266                        dev_err(arizona->dev,
 267                                "Failed to request CTRLIF_ERR %d: %d\n",
 268                                arizona->irq, ret);
 269                        goto err_ctrlif;
 270                }
 271        }
 272
 273        ret = request_threaded_irq(arizona->irq, NULL, arizona_irq_thread,
 274                                   flags, "arizona", arizona);
 275
 276        if (ret != 0) {
 277                dev_err(arizona->dev, "Failed to request IRQ %d: %d\n",
 278                        arizona->irq, ret);
 279                goto err_main_irq;
 280        }
 281
 282        return 0;
 283
 284err_main_irq:
 285        free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR), arizona);
 286err_ctrlif:
 287        free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_BOOT_DONE), arizona);
 288err_boot_done:
 289        regmap_del_irq_chip(irq_create_mapping(arizona->virq, 1),
 290                            arizona->irq_chip);
 291err_aod:
 292        regmap_del_irq_chip(irq_create_mapping(arizona->virq, 0),
 293                            arizona->aod_irq_chip);
 294err_domain:
 295err:
 296        return ret;
 297}
 298
 299int arizona_irq_exit(struct arizona *arizona)
 300{
 301        free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR), arizona);
 302        free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_BOOT_DONE), arizona);
 303        regmap_del_irq_chip(irq_create_mapping(arizona->virq, 1),
 304                            arizona->irq_chip);
 305        regmap_del_irq_chip(irq_create_mapping(arizona->virq, 0),
 306                            arizona->aod_irq_chip);
 307        free_irq(arizona->irq, arizona);
 308
 309        return 0;
 310}
 311
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