arizona-irq.c

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/*
 * Arizona interrupt support
 *
 * Copyright 2012 Wolfson Microelectronics plc
 *
 * Author: Mark Brown <[email protected]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/delay.h>
#include <linux/gpio.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/module.h>
#include <linux/pm_runtime.h>
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>

#include <linux/mfd/arizona/core.h>
#include <linux/mfd/arizona/registers.h>

#include "arizona.h"

static int arizona_map_irq(struct arizona *arizona, int irq)
{
    int ret;

    ret = regmap_irq_get_virq(arizona->aod_irq_chip, irq);
    if (ret < 0)
        ret = regmap_irq_get_virq(arizona->irq_chip, irq);

    return ret;
}

int arizona_request_irq(struct arizona *arizona, int irq, char *name,
               irq_handler_t handler, void *data)
{
    irq = arizona_map_irq(arizona, irq);
    if (irq < 0)
        return irq;

    return request_threaded_irq(irq, NULL, handler, IRQF_ONESHOT,
                    name, data);
}
EXPORT_SYMBOL_GPL(arizona_request_irq);

void arizona_free_irq(struct arizona *arizona, int irq, void *data)
{
    irq = arizona_map_irq(arizona, irq);
    if (irq < 0)
        return;

    free_irq(irq, data);
}
EXPORT_SYMBOL_GPL(arizona_free_irq);

int arizona_set_irq_wake(struct arizona *arizona, int irq, int on)
{
    irq = arizona_map_irq(arizona, irq);
    if (irq < 0)
        return irq;

    return irq_set_irq_wake(irq, on);
}
EXPORT_SYMBOL_GPL(arizona_set_irq_wake);

static irqreturn_t arizona_boot_done(int irq, void *data)
{
    struct arizona *arizona = data;

    dev_dbg(arizona->dev, "Boot done\n");

    return IRQ_HANDLED;
}

static irqreturn_t arizona_ctrlif_err(int irq, void *data)
{
    struct arizona *arizona = data;

    /*
     * For pretty much all potential sources a register cache sync
     * won't help, we've just got a software bug somewhere.
     */
    dev_err(arizona->dev, "Control interface error\n");

    return IRQ_HANDLED;
}

static irqreturn_t arizona_irq_thread(int irq, void *data)
{
    struct arizona *arizona = data;
    unsigned int val;
    int ret;

    ret = pm_runtime_get_sync(arizona->dev);
    if (ret < 0) {
        dev_err(arizona->dev, "Failed to resume device: %d\n", ret);
        return IRQ_NONE;
    }

    /* Always handle the AoD domain */
    handle_nested_irq(irq_find_mapping(arizona->virq, 0));

    /*
     * Check if one of the main interrupts is asserted and only
     * check that domain if it is.
     */
    ret = regmap_read(arizona->regmap, ARIZONA_IRQ_PIN_STATUS, &val);
    if (ret == 0 && val & ARIZONA_IRQ1_STS) {
        handle_nested_irq(irq_find_mapping(arizona->virq, 1));
    } else if (ret != 0) {
        dev_err(arizona->dev, "Failed to read main IRQ status: %d\n",
            ret);
    }

    pm_runtime_mark_last_busy(arizona->dev);
    pm_runtime_put_autosuspend(arizona->dev);

    return IRQ_HANDLED;
}

static void arizona_irq_enable(struct irq_data *data)
{
}

static void arizona_irq_disable(struct irq_data *data)
{
}

static struct irq_chip arizona_irq_chip = {
    .name           = "arizona",
    .irq_disable        = arizona_irq_disable,
    .irq_enable     = arizona_irq_enable,
};

static int arizona_irq_map(struct irq_domain *h, unsigned int virq,
                  irq_hw_number_t hw)
{
    struct regmap_irq_chip_data *data = h->host_data;

    irq_set_chip_data(virq, data);
    irq_set_chip_and_handler(virq, &arizona_irq_chip, handle_edge_irq);
    irq_set_nested_thread(virq, 1);

    /* ARM needs us to explicitly flag the IRQ as valid
     * and will set them noprobe when we do so. */
#ifdef CONFIG_ARM
    set_irq_flags(virq, IRQF_VALID);
#else
    irq_set_noprobe(virq);
#endif

    return 0;
}

static struct irq_domain_ops arizona_domain_ops = {
    .map    = arizona_irq_map,
    .xlate  = irq_domain_xlate_twocell,
};

int arizona_irq_init(struct arizona *arizona)
{
    int flags = IRQF_ONESHOT;
    int ret, i;
    const struct regmap_irq_chip *aod, *irq;
    bool ctrlif_error = true;

    switch (arizona->type) {
#ifdef CONFIG_MFD_WM5102
    case WM5102:
        aod = &wm5102_aod;
        irq = &wm5102_irq;

        switch (arizona->rev) {
        case 0:
        case 1:
            ctrlif_error = false;
            break;
        default:
            break;
        }
        break;
#endif
#ifdef CONFIG_MFD_WM5110
    case WM5110:
        aod = &wm5110_aod;
        irq = &wm5110_irq;

        switch (arizona->rev) {
        case 0:
        case 1:
            ctrlif_error = false;
            break;
        default:
            break;
        }
        break;
#endif
    default:
        BUG_ON("Unknown Arizona class device" == NULL);
        return -EINVAL;
    }

    if (arizona->pdata.irq_active_high) {
        ret = regmap_update_bits(arizona->regmap, ARIZONA_IRQ_CTRL_1,
                     ARIZONA_IRQ_POL, 0);
        if (ret != 0) {
            dev_err(arizona->dev, "Couldn't set IRQ polarity: %d\n",
                ret);
            goto err;
        }

        flags |= IRQF_TRIGGER_HIGH;
    } else {
        flags |= IRQF_TRIGGER_LOW;
    }

    /* Allocate a virtual IRQ domain to distribute to the regmap domains */
    arizona->virq = irq_domain_add_linear(NULL, 2, &arizona_domain_ops,
                          arizona);
    if (!arizona->virq) {
        ret = -EINVAL;
        goto err;
    }

    ret = regmap_add_irq_chip(arizona->regmap,
                  irq_create_mapping(arizona->virq, 0),
                  IRQF_ONESHOT, -1, aod,
                  &arizona->aod_irq_chip);
    if (ret != 0) {
        dev_err(arizona->dev, "Failed to add AOD IRQs: %d\n", ret);
        goto err_domain;
    }

    ret = regmap_add_irq_chip(arizona->regmap,
                  irq_create_mapping(arizona->virq, 1),
                  IRQF_ONESHOT, -1, irq,
                  &arizona->irq_chip);
    if (ret != 0) {
        dev_err(arizona->dev, "Failed to add AOD IRQs: %d\n", ret);
        goto err_aod;
    }

    /* Make sure the boot done IRQ is unmasked for resumes */
    i = arizona_map_irq(arizona, ARIZONA_IRQ_BOOT_DONE);
    ret = request_threaded_irq(i, NULL, arizona_boot_done, IRQF_ONESHOT,
                   "Boot done", arizona);
    if (ret != 0) {
        dev_err(arizona->dev, "Failed to request boot done %d: %d\n",
            arizona->irq, ret);
        goto err_boot_done;
    }

    /* Handle control interface errors in the core */
    if (ctrlif_error) {
        i = arizona_map_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR);
        ret = request_threaded_irq(i, NULL, arizona_ctrlif_err,
                       IRQF_ONESHOT,
                       "Control interface error", arizona);
        if (ret != 0) {
            dev_err(arizona->dev,
                "Failed to request CTRLIF_ERR %d: %d\n",
                arizona->irq, ret);
            goto err_ctrlif;
        }
    }

    ret = request_threaded_irq(arizona->irq, NULL, arizona_irq_thread,
                   flags, "arizona", arizona);

    if (ret != 0) {
        dev_err(arizona->dev, "Failed to request IRQ %d: %d\n",
            arizona->irq, ret);
        goto err_main_irq;
    }

    return 0;

err_main_irq:
    free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR), arizona);
err_ctrlif:
    free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_BOOT_DONE), arizona);
err_boot_done:
    regmap_del_irq_chip(irq_create_mapping(arizona->virq, 1),
                arizona->irq_chip);
err_aod:
    regmap_del_irq_chip(irq_create_mapping(arizona->virq, 0),
                arizona->aod_irq_chip);
err_domain:
err:
    return ret;
}

int arizona_irq_exit(struct arizona *arizona)
{
    free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR), arizona);
    free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_BOOT_DONE), arizona);
    regmap_del_irq_chip(irq_create_mapping(arizona->virq, 1),
                arizona->irq_chip);
    regmap_del_irq_chip(irq_create_mapping(arizona->virq, 0),
                arizona->aod_irq_chip);
    free_irq(arizona->irq, arizona);

    return 0;
}