--- /dev/null
+/*
+ * 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;
+}
Code Review / kvmfornfv.git / blobdiff