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linux-next/drivers/mfd/arizona-irq.c
Andrew Lunn 39c3fd5895 kernel/irq: Extend lockdep class for request mutex 
The IRQ code already has support for lockdep class for the lock mutex
in an interrupt descriptor. Extend this to add a second class for the
request mutex in the descriptor. Not having a class is resulting in
false positive splats in some code paths.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: linus.walleij@linaro.org
Cc: grygorii.strashko@ti.com
Cc: f.fainelli@gmail.com
Link: https://lkml.kernel.org/r/1512234664-21555-1-git-send-email-andrew@lunn.ch
2017-12-28 12:26:35 +01:00

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/*
* Arizona interrupt support
*
* Copyright 2012 Wolfson Microelectronics plc
*
* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
*
* 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"
#define ARIZONA_AOD_IRQ_INDEX 0
#define ARIZONA_MAIN_IRQ_INDEX 1
static int arizona_map_irq(struct arizona *arizona, int irq)
{
int ret;
if (arizona->aod_irq_chip) {
ret = regmap_irq_get_virq(arizona->aod_irq_chip, irq);
if (ret >= 0)
return ret;
}
return regmap_irq_get_virq(arizona->irq_chip, irq);
}
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;
bool poll;
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;
}
do {
poll = false;
if (arizona->aod_irq_chip) {
/*
* Check the AOD status register to determine whether
* the nested IRQ handler should be called.
*/
ret = regmap_read(arizona->regmap,
ARIZONA_AOD_IRQ1, &val);
if (ret)
dev_warn(arizona->dev,
"Failed to read AOD IRQ1 %d\n", ret);
else if (val)
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);
}
/*
* Poll the IRQ pin status to see if we're really done
* if the interrupt controller can't do it for us.
*/
if (!arizona->pdata.irq_gpio) {
break;
} else if (arizona->pdata.irq_flags & IRQF_TRIGGER_RISING &&
gpio_get_value_cansleep(arizona->pdata.irq_gpio)) {
poll = true;
} else if (arizona->pdata.irq_flags & IRQF_TRIGGER_FALLING &&
!gpio_get_value_cansleep(arizona->pdata.irq_gpio)) {
poll = true;
}
} while (poll);
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 int arizona_irq_set_wake(struct irq_data *data, unsigned int on)
{
struct arizona *arizona = irq_data_get_irq_chip_data(data);
return irq_set_irq_wake(arizona->irq, on);
}
static struct irq_chip arizona_irq_chip = {
.name = "arizona",
.irq_disable = arizona_irq_disable,
.irq_enable = arizona_irq_enable,
.irq_set_wake = arizona_irq_set_wake,
};
static struct lock_class_key arizona_irq_lock_class;
static struct lock_class_key arizona_irq_request_class;
static int arizona_irq_map(struct irq_domain *h, unsigned int virq,
irq_hw_number_t hw)
{
struct arizona *data = h->host_data;
irq_set_chip_data(virq, data);
irq_set_lockdep_class(virq, &arizona_irq_lock_class,
&arizona_irq_request_class);
irq_set_chip_and_handler(virq, &arizona_irq_chip, handle_simple_irq);
irq_set_nested_thread(virq, 1);
irq_set_noprobe(virq);
return 0;
}
static const 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;
const struct regmap_irq_chip *aod, *irq;
struct irq_data *irq_data;
unsigned int virq;
arizona->ctrlif_error = true;
switch (arizona->type) {
#ifdef CONFIG_MFD_WM5102
case WM5102:
aod = &wm5102_aod;
irq = &wm5102_irq;
arizona->ctrlif_error = false;
break;
#endif
#ifdef CONFIG_MFD_WM5110
case WM5110:
case WM8280:
aod = &wm5110_aod;
switch (arizona->rev) {
case 0 ... 2:
irq = &wm5110_irq;
break;
default:
irq = &wm5110_revd_irq;
break;
}
arizona->ctrlif_error = false;
break;
#endif
#ifdef CONFIG_MFD_CS47L24
case WM1831:
case CS47L24:
aod = NULL;
irq = &cs47l24_irq;
arizona->ctrlif_error = false;
break;
#endif
#ifdef CONFIG_MFD_WM8997
case WM8997:
aod = &wm8997_aod;
irq = &wm8997_irq;
arizona->ctrlif_error = false;
break;
#endif
#ifdef CONFIG_MFD_WM8998
case WM8998:
case WM1814:
aod = &wm8998_aod;
irq = &wm8998_irq;
arizona->ctrlif_error = false;
break;
#endif
default:
BUG_ON("Unknown Arizona class device" == NULL);
return -EINVAL;
}
/* Disable all wake sources by default */
regmap_write(arizona->regmap, ARIZONA_WAKE_CONTROL, 0);
/* Read the flags from the interrupt controller if not specified */
if (!arizona->pdata.irq_flags) {
irq_data = irq_get_irq_data(arizona->irq);
if (!irq_data) {
dev_err(arizona->dev, "Invalid IRQ: %d\n",
arizona->irq);
return -EINVAL;
}
arizona->pdata.irq_flags = irqd_get_trigger_type(irq_data);
switch (arizona->pdata.irq_flags) {
case IRQF_TRIGGER_LOW:
case IRQF_TRIGGER_HIGH:
case IRQF_TRIGGER_RISING:
case IRQF_TRIGGER_FALLING:
break;
case IRQ_TYPE_NONE:
default:
/* Device default */
arizona->pdata.irq_flags = IRQF_TRIGGER_LOW;
break;
}
}
if (arizona->pdata.irq_flags & (IRQF_TRIGGER_HIGH |
IRQF_TRIGGER_RISING)) {
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 |= arizona->pdata.irq_flags;
/* 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) {
dev_err(arizona->dev, "Failed to add core IRQ domain\n");
ret = -EINVAL;
goto err;
}
if (aod) {
virq = irq_create_mapping(arizona->virq, ARIZONA_AOD_IRQ_INDEX);
if (!virq) {
dev_err(arizona->dev, "Failed to map AOD IRQs\n");
ret = -EINVAL;
goto err_domain;
}
ret = regmap_add_irq_chip(arizona->regmap, virq, IRQF_ONESHOT,
0, aod, &arizona->aod_irq_chip);
if (ret != 0) {
dev_err(arizona->dev,
"Failed to add AOD IRQs: %d\n", ret);
goto err_map_aod;
}
}
virq = irq_create_mapping(arizona->virq, ARIZONA_MAIN_IRQ_INDEX);
if (!virq) {
dev_err(arizona->dev, "Failed to map main IRQs\n");
ret = -EINVAL;
goto err_aod;
}
ret = regmap_add_irq_chip(arizona->regmap, virq, IRQF_ONESHOT,
0, irq, &arizona->irq_chip);
if (ret != 0) {
dev_err(arizona->dev, "Failed to add main IRQs: %d\n", ret);
goto err_map_main_irq;
}
/* Used to emulate edge trigger and to work around broken pinmux */
if (arizona->pdata.irq_gpio) {
if (gpio_to_irq(arizona->pdata.irq_gpio) != arizona->irq) {
dev_warn(arizona->dev, "IRQ %d is not GPIO %d (%d)\n",
arizona->irq, arizona->pdata.irq_gpio,
gpio_to_irq(arizona->pdata.irq_gpio));
arizona->irq = gpio_to_irq(arizona->pdata.irq_gpio);
}
ret = devm_gpio_request_one(arizona->dev,
arizona->pdata.irq_gpio,
GPIOF_IN, "arizona IRQ");
if (ret != 0) {
dev_err(arizona->dev,
"Failed to request IRQ GPIO %d:: %d\n",
arizona->pdata.irq_gpio, ret);
arizona->pdata.irq_gpio = 0;
}
}
ret = request_threaded_irq(arizona->irq, NULL, arizona_irq_thread,
flags, "arizona", arizona);
if (ret != 0) {
dev_err(arizona->dev, "Failed to request primary IRQ %d: %d\n",
arizona->irq, ret);
goto err_main_irq;
}
/* Make sure the boot done IRQ is unmasked for resumes */
ret = arizona_request_irq(arizona, ARIZONA_IRQ_BOOT_DONE, "Boot done",
arizona_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 (arizona->ctrlif_error) {
ret = arizona_request_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR,
"Control interface error",
arizona_ctrlif_err, arizona);
if (ret != 0) {
dev_err(arizona->dev,
"Failed to request CTRLIF_ERR %d: %d\n",
arizona->irq, ret);
goto err_ctrlif;
}
}
return 0;
err_ctrlif:
arizona_free_irq(arizona, ARIZONA_IRQ_BOOT_DONE, arizona);
err_boot_done:
free_irq(arizona->irq, arizona);
err_main_irq:
regmap_del_irq_chip(irq_find_mapping(arizona->virq,
ARIZONA_MAIN_IRQ_INDEX),
arizona->irq_chip);
err_map_main_irq:
irq_dispose_mapping(irq_find_mapping(arizona->virq,
ARIZONA_MAIN_IRQ_INDEX));
err_aod:
regmap_del_irq_chip(irq_find_mapping(arizona->virq,
ARIZONA_AOD_IRQ_INDEX),
arizona->aod_irq_chip);
err_map_aod:
irq_dispose_mapping(irq_find_mapping(arizona->virq,
ARIZONA_AOD_IRQ_INDEX));
err_domain:
irq_domain_remove(arizona->virq);
err:
return ret;
}
int arizona_irq_exit(struct arizona *arizona)
{
unsigned int virq;
if (arizona->ctrlif_error)
arizona_free_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR, arizona);
arizona_free_irq(arizona, ARIZONA_IRQ_BOOT_DONE, arizona);
virq = irq_find_mapping(arizona->virq, ARIZONA_MAIN_IRQ_INDEX);
regmap_del_irq_chip(virq, arizona->irq_chip);
irq_dispose_mapping(virq);
virq = irq_find_mapping(arizona->virq, ARIZONA_AOD_IRQ_INDEX);
regmap_del_irq_chip(virq, arizona->aod_irq_chip);
irq_dispose_mapping(virq);
irq_domain_remove(arizona->virq);
free_irq(arizona->irq, arizona);
return 0;
}
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