374 lines
9.0 KiB
C
374 lines
9.0 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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struct irq_data *irq_data;
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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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#ifdef CONFIG_MFD_WM8997
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case WM8997:
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aod = &wm8997_aod;
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irq = &wm8997_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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/* Read the flags from the interrupt controller if not specified */
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if (!arizona->pdata.irq_flags) {
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irq_data = irq_get_irq_data(arizona->irq);
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if (!irq_data) {
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dev_err(arizona->dev, "Invalid IRQ: %d\n",
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arizona->irq);
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return -EINVAL;
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}
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arizona->pdata.irq_flags = irqd_get_trigger_type(irq_data);
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switch (arizona->pdata.irq_flags) {
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case IRQF_TRIGGER_LOW:
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case IRQF_TRIGGER_HIGH:
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case IRQF_TRIGGER_RISING:
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case IRQF_TRIGGER_FALLING:
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break;
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case IRQ_TYPE_NONE:
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default:
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/* Device default */
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arizona->pdata.irq_flags = IRQF_TRIGGER_LOW;
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break;
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}
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}
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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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