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