diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/mfd/arizona-irq.c | 267 |
1 files changed, 267 insertions, 0 deletions
diff --git a/drivers/mfd/arizona-irq.c b/drivers/mfd/arizona-irq.c new file mode 100644 index 00000000000..4c7894046a3 --- /dev/null +++ b/drivers/mfd/arizona-irq.c @@ -0,0 +1,267 @@ +/* + * 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; + int i, 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; + } + + /* Check both domains */ + for (i = 0; i < 2; i++) + handle_nested_irq(irq_find_mapping(arizona->virq, i)); + + 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 struct irq_chip arizona_irq_chip = { + .name = "arizona", + .irq_disable = arizona_irq_disable, + .irq_enable = arizona_irq_enable, +}; + +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_edge_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; + + switch (arizona->type) { + case WM5102: + aod = &wm5102_aod; + irq = &wm5102_irq; + break; + default: + BUG_ON("Unknown Arizona class device" == NULL); + return -EINVAL; + } + + if (arizona->pdata.irq_active_high) { + 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 |= IRQF_TRIGGER_HIGH; + } else { + flags |= IRQF_TRIGGER_LOW; + } + + /* 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) { + ret = -EINVAL; + goto err; + } + + ret = regmap_add_irq_chip(arizona->regmap, + irq_create_mapping(arizona->virq, 0), + IRQF_ONESHOT, -1, 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, -1, irq, + &arizona->irq_chip); + if (ret != 0) { + dev_err(arizona->dev, "Failed to add AOD 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 */ + 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 boot done %d: %d\n", + arizona->irq, ret); + goto err_ctrlif; + } + + ret = request_threaded_irq(arizona->irq, NULL, arizona_irq_thread, + flags, "arizona", arizona); + + if (ret != 0) { + dev_err(arizona->dev, "Failed to request IRQ %d: %d\n", + arizona->irq, ret); + goto err_main_irq; + } + + return 0; + +err_main_irq: + 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) +{ + 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; +} |