Initial import

1 files changed, 395 insertions, 0 deletions

diff --git a/drivers/mfd/arizona-irq.c b/drivers/mfd/arizona-irq.c
new file mode 100644
index 000000000..d063b94b9
--- /dev/null
+++ b/drivers/mfd/arizona-irq.c
@@ -0,0 +1,395 @@
+/*
+ * 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"
+
+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;
+	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;
+
+		/* 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);
+		}
+
+		/*
+		 * 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 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_simple_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;
+	struct irq_data *irq_data;
+
+	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_WM8997
+	case WM8997:
+		aod = &wm8997_aod;
+		irq = &wm8997_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;
+	}
+
+	ret = regmap_add_irq_chip(arizona->regmap,
+				  irq_create_mapping(arizona->virq, 0),
+				  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_domain;
+	}
+
+	ret = regmap_add_irq_chip(arizona->regmap,
+				  irq_create_mapping(arizona->virq, 1),
+				  IRQF_ONESHOT, 0, irq,
+				  &arizona->irq_chip);
+	if (ret != 0) {
+		dev_err(arizona->dev, "Failed to add main 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 (arizona->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;
+		}
+	}
+
+	/* 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;
+	}
+
+	return 0;
+
+err_main_irq:
+	if (arizona->ctrlif_error)
+		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)
+{
+	if (arizona->ctrlif_error)
+		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;
+}