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         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
 127 static void arizona_irq_enable(struct irq_data *data)
 128 {
 129 }
 130
 131 static void arizona_irq_disable(struct irq_data *data)
 132 {
 133 }
 134
 135 static struct irq_chip arizona_irq_chip = {
 136         .name                   = "arizona",
 137         .irq_disable            = arizona_irq_disable,
 138         .irq_enable             = arizona_irq_enable,
 139 };
 140
 141 static 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
 161 static struct irq_domain_ops arizona_domain_ops = {
 162         .map    = arizona_irq_map,
 163         .xlate  = irq_domain_xlate_twocell,
 164 };
 165
 166 int 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                 ctrlif_error = false;
 180                 break;
 181 #endif
 182 #ifdef CONFIG_MFD_WM5110
 183         case WM5110:
 184                 aod = &wm5110_aod;
 185                 irq = &wm5110_irq;
 186
 187                 ctrlif_error = false;
 188                 break;
 189 #endif
 190         default:
 191                 BUG_ON("Unknown Arizona class device" == NULL);
 192                 return -EINVAL;
 193         }
 194
 195         if (arizona->pdata.irq_active_high) {
 196                 ret = regmap_update_bits(arizona->regmap, ARIZONA_IRQ_CTRL_1,
 197                                          ARIZONA_IRQ_POL, 0);
 198                 if (ret != 0) {
 199                         dev_err(arizona->dev, "Couldn't set IRQ polarity: %d\n",
 200                                 ret);
 201                         goto err;
 202                 }
 203
 204                 flags |= IRQF_TRIGGER_HIGH;
 205         } else {
 206                 flags |= IRQF_TRIGGER_LOW;
 207         }
 208
 209         /* Allocate a virtual IRQ domain to distribute to the regmap domains */
 210         arizona->virq = irq_domain_add_linear(NULL, 2, &arizona_domain_ops,
 211                                               arizona);
 212         if (!arizona->virq) {
 213                 dev_err(arizona->dev, "Failed to add core IRQ domain\n");
 214                 ret = -EINVAL;
 215                 goto err;
 216         }
 217
 218         ret = regmap_add_irq_chip(arizona->regmap,
 219                                   irq_create_mapping(arizona->virq, 0),
 220                                   IRQF_ONESHOT, -1, aod,
 221                                   &arizona->aod_irq_chip);
 222         if (ret != 0) {
 223                 dev_err(arizona->dev, "Failed to add AOD IRQs: %d\n", ret);
 224                 goto err_domain;
 225         }
 226
 227         ret = regmap_add_irq_chip(arizona->regmap,
 228                                   irq_create_mapping(arizona->virq, 1),
 229                                   IRQF_ONESHOT, -1, irq,
 230                                   &arizona->irq_chip);
 231         if (ret != 0) {
 232                 dev_err(arizona->dev, "Failed to add AOD IRQs: %d\n", ret);
 233                 goto err_aod;
 234         }
 235
 236         /* Make sure the boot done IRQ is unmasked for resumes */
 237         i = arizona_map_irq(arizona, ARIZONA_IRQ_BOOT_DONE);
 238         ret = request_threaded_irq(i, NULL, arizona_boot_done, IRQF_ONESHOT,
 239                                    "Boot done", arizona);
 240         if (ret != 0) {
 241                 dev_err(arizona->dev, "Failed to request boot done %d: %d\n",
 242                         arizona->irq, ret);
 243                 goto err_boot_done;
 244         }
 245
 246         /* Handle control interface errors in the core */
 247         if (ctrlif_error) {
 248                 i = arizona_map_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR);
 249                 ret = request_threaded_irq(i, NULL, arizona_ctrlif_err,
 250                                            IRQF_ONESHOT,
 251                                            "Control interface error", arizona);
 252                 if (ret != 0) {
 253                         dev_err(arizona->dev,
 254                                 "Failed to request CTRLIF_ERR %d: %d\n",
 255                                 arizona->irq, ret);
 256                         goto err_ctrlif;
 257                 }
 258         }
 259
 260         ret = request_threaded_irq(arizona->irq, NULL, arizona_irq_thread,
 261                                    flags, "arizona", arizona);
 262
 263         if (ret != 0) {
 264                 dev_err(arizona->dev, "Failed to request IRQ %d: %d\n",
 265                         arizona->irq, ret);
 266                 goto err_main_irq;
 267         }
 268
 269         return 0;
 270
 271 err_main_irq:
 272         free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR), arizona);
 273 err_ctrlif:
 274         free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_BOOT_DONE), arizona);
 275 err_boot_done:
 276         regmap_del_irq_chip(irq_create_mapping(arizona->virq, 1),
 277                             arizona->irq_chip);
 278 err_aod:
 279         regmap_del_irq_chip(irq_create_mapping(arizona->virq, 0),
 280                             arizona->aod_irq_chip);
 281 err_domain:
 282 err:
 283         return ret;
 284 }
 285
 286 int arizona_irq_exit(struct arizona *arizona)
 287 {
 288         free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR), arizona);
 289         free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_BOOT_DONE), arizona);
 290         regmap_del_irq_chip(irq_create_mapping(arizona->virq, 1),
 291                             arizona->irq_chip);
 292         regmap_del_irq_chip(irq_create_mapping(arizona->virq, 0),
 293                             arizona->aod_irq_chip);
 294         free_irq(arizona->irq, arizona);
 295
 296         return 0;
 297 }