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3092f8050e
If a GPIO is specified for the chip IRQ line then request it. This improves support for systems that do not put pins into input mode when used as interrupts. Also use this GPIO when the primary IRQ is in edge triggered mode to detect if we have handled pending interrupts in order to improve robustness. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
343 lines
8.4 KiB
C
343 lines
8.4 KiB
C
/*
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* Arizona interrupt support
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*
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* Copyright 2012 Wolfson Microelectronics plc
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*
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* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/delay.h>
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#include <linux/gpio.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/irqdomain.h>
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#include <linux/module.h>
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#include <linux/pm_runtime.h>
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#include <linux/regmap.h>
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#include <linux/regulator/consumer.h>
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#include <linux/slab.h>
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#include <linux/mfd/arizona/core.h>
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#include <linux/mfd/arizona/registers.h>
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#include "arizona.h"
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static int arizona_map_irq(struct arizona *arizona, int irq)
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{
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int ret;
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ret = regmap_irq_get_virq(arizona->aod_irq_chip, irq);
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if (ret < 0)
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ret = regmap_irq_get_virq(arizona->irq_chip, irq);
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return ret;
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}
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int arizona_request_irq(struct arizona *arizona, int irq, char *name,
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irq_handler_t handler, void *data)
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{
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irq = arizona_map_irq(arizona, irq);
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if (irq < 0)
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return irq;
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return request_threaded_irq(irq, NULL, handler, IRQF_ONESHOT,
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name, data);
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}
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EXPORT_SYMBOL_GPL(arizona_request_irq);
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void arizona_free_irq(struct arizona *arizona, int irq, void *data)
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{
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irq = arizona_map_irq(arizona, irq);
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if (irq < 0)
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return;
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free_irq(irq, data);
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}
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EXPORT_SYMBOL_GPL(arizona_free_irq);
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int arizona_set_irq_wake(struct arizona *arizona, int irq, int on)
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{
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irq = arizona_map_irq(arizona, irq);
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if (irq < 0)
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return irq;
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return irq_set_irq_wake(irq, on);
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}
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EXPORT_SYMBOL_GPL(arizona_set_irq_wake);
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static irqreturn_t arizona_boot_done(int irq, void *data)
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{
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struct arizona *arizona = data;
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dev_dbg(arizona->dev, "Boot done\n");
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return IRQ_HANDLED;
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}
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static irqreturn_t arizona_ctrlif_err(int irq, void *data)
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{
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struct arizona *arizona = data;
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/*
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* For pretty much all potential sources a register cache sync
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* won't help, we've just got a software bug somewhere.
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*/
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dev_err(arizona->dev, "Control interface error\n");
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return IRQ_HANDLED;
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}
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static irqreturn_t arizona_irq_thread(int irq, void *data)
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{
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struct arizona *arizona = data;
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bool poll;
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unsigned int val;
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int ret;
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ret = pm_runtime_get_sync(arizona->dev);
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if (ret < 0) {
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dev_err(arizona->dev, "Failed to resume device: %d\n", ret);
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return IRQ_NONE;
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}
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do {
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poll = false;
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/* Always handle the AoD domain */
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handle_nested_irq(irq_find_mapping(arizona->virq, 0));
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/*
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* Check if one of the main interrupts is asserted and only
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* check that domain if it is.
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*/
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ret = regmap_read(arizona->regmap, ARIZONA_IRQ_PIN_STATUS,
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&val);
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if (ret == 0 && val & ARIZONA_IRQ1_STS) {
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handle_nested_irq(irq_find_mapping(arizona->virq, 1));
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} else if (ret != 0) {
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dev_err(arizona->dev,
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"Failed to read main IRQ status: %d\n", ret);
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}
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/*
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* Poll the IRQ pin status to see if we're really done
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* if the interrupt controller can't do it for us.
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*/
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if (!arizona->pdata.irq_gpio) {
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break;
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} else if (arizona->pdata.irq_flags & IRQF_TRIGGER_RISING &&
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gpio_get_value_cansleep(arizona->pdata.irq_gpio)) {
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poll = true;
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} else if (arizona->pdata.irq_flags & IRQF_TRIGGER_FALLING &&
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!gpio_get_value_cansleep(arizona->pdata.irq_gpio)) {
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poll = true;
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}
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} while (poll);
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pm_runtime_mark_last_busy(arizona->dev);
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pm_runtime_put_autosuspend(arizona->dev);
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return IRQ_HANDLED;
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}
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static void arizona_irq_enable(struct irq_data *data)
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{
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}
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static void arizona_irq_disable(struct irq_data *data)
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{
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}
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static struct irq_chip arizona_irq_chip = {
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.name = "arizona",
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.irq_disable = arizona_irq_disable,
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.irq_enable = arizona_irq_enable,
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};
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static int arizona_irq_map(struct irq_domain *h, unsigned int virq,
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irq_hw_number_t hw)
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{
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struct regmap_irq_chip_data *data = h->host_data;
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irq_set_chip_data(virq, data);
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irq_set_chip_and_handler(virq, &arizona_irq_chip, handle_edge_irq);
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irq_set_nested_thread(virq, 1);
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/* ARM needs us to explicitly flag the IRQ as valid
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* and will set them noprobe when we do so. */
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#ifdef CONFIG_ARM
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set_irq_flags(virq, IRQF_VALID);
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#else
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irq_set_noprobe(virq);
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#endif
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return 0;
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}
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static struct irq_domain_ops arizona_domain_ops = {
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.map = arizona_irq_map,
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.xlate = irq_domain_xlate_twocell,
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};
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int arizona_irq_init(struct arizona *arizona)
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{
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int flags = IRQF_ONESHOT;
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int ret, i;
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const struct regmap_irq_chip *aod, *irq;
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bool ctrlif_error = true;
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switch (arizona->type) {
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#ifdef CONFIG_MFD_WM5102
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case WM5102:
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aod = &wm5102_aod;
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irq = &wm5102_irq;
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ctrlif_error = false;
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break;
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#endif
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#ifdef CONFIG_MFD_WM5110
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case WM5110:
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aod = &wm5110_aod;
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irq = &wm5110_irq;
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ctrlif_error = false;
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break;
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#endif
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default:
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BUG_ON("Unknown Arizona class device" == NULL);
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return -EINVAL;
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}
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/* Disable all wake sources by default */
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regmap_write(arizona->regmap, ARIZONA_WAKE_CONTROL, 0);
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if (!arizona->pdata.irq_flags)
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arizona->pdata.irq_flags = IRQF_TRIGGER_LOW;
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if (arizona->pdata.irq_flags & (IRQF_TRIGGER_HIGH |
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IRQF_TRIGGER_RISING)) {
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ret = regmap_update_bits(arizona->regmap, ARIZONA_IRQ_CTRL_1,
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ARIZONA_IRQ_POL, 0);
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if (ret != 0) {
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dev_err(arizona->dev, "Couldn't set IRQ polarity: %d\n",
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ret);
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goto err;
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}
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}
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flags |= arizona->pdata.irq_flags;
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/* Allocate a virtual IRQ domain to distribute to the regmap domains */
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arizona->virq = irq_domain_add_linear(NULL, 2, &arizona_domain_ops,
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arizona);
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if (!arizona->virq) {
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dev_err(arizona->dev, "Failed to add core IRQ domain\n");
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ret = -EINVAL;
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goto err;
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}
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ret = regmap_add_irq_chip(arizona->regmap,
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irq_create_mapping(arizona->virq, 0),
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IRQF_ONESHOT, -1, aod,
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&arizona->aod_irq_chip);
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if (ret != 0) {
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dev_err(arizona->dev, "Failed to add AOD IRQs: %d\n", ret);
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goto err_domain;
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}
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ret = regmap_add_irq_chip(arizona->regmap,
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irq_create_mapping(arizona->virq, 1),
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IRQF_ONESHOT, -1, irq,
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&arizona->irq_chip);
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if (ret != 0) {
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dev_err(arizona->dev, "Failed to add AOD IRQs: %d\n", ret);
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goto err_aod;
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}
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/* Make sure the boot done IRQ is unmasked for resumes */
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i = arizona_map_irq(arizona, ARIZONA_IRQ_BOOT_DONE);
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ret = request_threaded_irq(i, NULL, arizona_boot_done, IRQF_ONESHOT,
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"Boot done", arizona);
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if (ret != 0) {
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dev_err(arizona->dev, "Failed to request boot done %d: %d\n",
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arizona->irq, ret);
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goto err_boot_done;
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}
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/* Handle control interface errors in the core */
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if (ctrlif_error) {
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i = arizona_map_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR);
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ret = request_threaded_irq(i, NULL, arizona_ctrlif_err,
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IRQF_ONESHOT,
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"Control interface error", arizona);
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if (ret != 0) {
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dev_err(arizona->dev,
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"Failed to request CTRLIF_ERR %d: %d\n",
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arizona->irq, ret);
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goto err_ctrlif;
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}
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}
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/* Used to emulate edge trigger and to work around broken pinmux */
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if (arizona->pdata.irq_gpio) {
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if (gpio_to_irq(arizona->pdata.irq_gpio) != arizona->irq) {
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dev_warn(arizona->dev, "IRQ %d is not GPIO %d (%d)\n",
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arizona->irq, arizona->pdata.irq_gpio,
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gpio_to_irq(arizona->pdata.irq_gpio));
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arizona->irq = gpio_to_irq(arizona->pdata.irq_gpio);
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}
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ret = devm_gpio_request_one(arizona->dev,
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arizona->pdata.irq_gpio,
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GPIOF_IN, "arizona IRQ");
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if (ret != 0) {
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dev_err(arizona->dev,
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"Failed to request IRQ GPIO %d:: %d\n",
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arizona->pdata.irq_gpio, ret);
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arizona->pdata.irq_gpio = 0;
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}
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}
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ret = request_threaded_irq(arizona->irq, NULL, arizona_irq_thread,
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flags, "arizona", arizona);
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if (ret != 0) {
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dev_err(arizona->dev, "Failed to request primary IRQ %d: %d\n",
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arizona->irq, ret);
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goto err_main_irq;
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}
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return 0;
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err_main_irq:
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free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR), arizona);
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err_ctrlif:
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free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_BOOT_DONE), arizona);
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err_boot_done:
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regmap_del_irq_chip(irq_create_mapping(arizona->virq, 1),
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arizona->irq_chip);
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err_aod:
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regmap_del_irq_chip(irq_create_mapping(arizona->virq, 0),
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arizona->aod_irq_chip);
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err_domain:
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err:
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return ret;
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}
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int arizona_irq_exit(struct arizona *arizona)
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{
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free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR), arizona);
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free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_BOOT_DONE), arizona);
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regmap_del_irq_chip(irq_create_mapping(arizona->virq, 1),
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arizona->irq_chip);
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regmap_del_irq_chip(irq_create_mapping(arizona->virq, 0),
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arizona->aod_irq_chip);
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free_irq(arizona->irq, arizona);
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return 0;
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}
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