// SPDX-License-Identifier: GPL-2.0 /* * Copyright (C) 2018 Spreadtrum Communications Inc. * Copyright (C) 2018 Linaro Ltd. */ #include <linux/bitops.h> #include <linux/gpio/driver.h> #include <linux/interrupt.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/notifier.h> #include <linux/of.h> #include <linux/platform_device.h> #include <linux/spinlock.h> /* EIC registers definition */ #define SPRD_EIC_DBNC_DATA … #define SPRD_EIC_DBNC_DMSK … #define SPRD_EIC_DBNC_IEV … #define SPRD_EIC_DBNC_IE … #define SPRD_EIC_DBNC_RIS … #define SPRD_EIC_DBNC_MIS … #define SPRD_EIC_DBNC_IC … #define SPRD_EIC_DBNC_TRIG … #define SPRD_EIC_DBNC_CTRL0 … #define SPRD_EIC_LATCH_INTEN … #define SPRD_EIC_LATCH_INTRAW … #define SPRD_EIC_LATCH_INTMSK … #define SPRD_EIC_LATCH_INTCLR … #define SPRD_EIC_LATCH_INTPOL … #define SPRD_EIC_LATCH_INTMODE … #define SPRD_EIC_ASYNC_INTIE … #define SPRD_EIC_ASYNC_INTRAW … #define SPRD_EIC_ASYNC_INTMSK … #define SPRD_EIC_ASYNC_INTCLR … #define SPRD_EIC_ASYNC_INTMODE … #define SPRD_EIC_ASYNC_INTBOTH … #define SPRD_EIC_ASYNC_INTPOL … #define SPRD_EIC_ASYNC_DATA … #define SPRD_EIC_SYNC_INTIE … #define SPRD_EIC_SYNC_INTRAW … #define SPRD_EIC_SYNC_INTMSK … #define SPRD_EIC_SYNC_INTCLR … #define SPRD_EIC_SYNC_INTMODE … #define SPRD_EIC_SYNC_INTBOTH … #define SPRD_EIC_SYNC_INTPOL … #define SPRD_EIC_SYNC_DATA … /* * The digital-chip EIC controller can support maximum 3 banks, and each bank * contains 8 EICs. */ #define SPRD_EIC_MAX_BANK … #define SPRD_EIC_PER_BANK_NR … #define SPRD_EIC_DATA_MASK … #define SPRD_EIC_BIT(x) … #define SPRD_EIC_DBNC_MASK … /* * The Spreadtrum EIC (external interrupt controller) can be used only in * input mode to generate interrupts if detecting input signals. * * The Spreadtrum digital-chip EIC controller contains 4 sub-modules: * debounce EIC, latch EIC, async EIC and sync EIC, * * The debounce EIC is used to capture the input signals' stable status * (millisecond resolution) and a single-trigger mechanism is introduced * into this sub-module to enhance the input event detection reliability. * The debounce range is from 1ms to 4s with a step size of 1ms. * * The latch EIC is used to latch some special power down signals and * generate interrupts, since the latch EIC does not depend on the APB clock * to capture signals. * * The async EIC uses a 32k clock to capture the short signals (microsecond * resolution) to generate interrupts by level or edge trigger. * * The EIC-sync is similar with GPIO's input function, which is a synchronized * signal input register. */ enum sprd_eic_type { … }; struct sprd_eic { … }; static ATOMIC_NOTIFIER_HEAD(sprd_eic_irq_notifier); static struct sprd_eic *to_sprd_eic(struct notifier_block *nb) { … } struct sprd_eic_variant_data { … }; static const char *sprd_eic_label_name[SPRD_EIC_MAX] = …; static const struct sprd_eic_variant_data sc9860_eic_dbnc_data = …; static const struct sprd_eic_variant_data sc9860_eic_latch_data = …; static const struct sprd_eic_variant_data sc9860_eic_async_data = …; static const struct sprd_eic_variant_data sc9860_eic_sync_data = …; static inline void __iomem *sprd_eic_offset_base(struct sprd_eic *sprd_eic, unsigned int bank) { … } static void sprd_eic_update(struct gpio_chip *chip, unsigned int offset, u16 reg, unsigned int val) { … } static int sprd_eic_read(struct gpio_chip *chip, unsigned int offset, u16 reg) { … } static int sprd_eic_request(struct gpio_chip *chip, unsigned int offset) { … } static void sprd_eic_free(struct gpio_chip *chip, unsigned int offset) { … } static int sprd_eic_get(struct gpio_chip *chip, unsigned int offset) { … } static int sprd_eic_direction_input(struct gpio_chip *chip, unsigned int offset) { … } static void sprd_eic_set(struct gpio_chip *chip, unsigned int offset, int value) { … } static int sprd_eic_set_debounce(struct gpio_chip *chip, unsigned int offset, unsigned int debounce) { … } static int sprd_eic_set_config(struct gpio_chip *chip, unsigned int offset, unsigned long config) { … } static void sprd_eic_irq_mask(struct irq_data *data) { … } static void sprd_eic_irq_unmask(struct irq_data *data) { … } static void sprd_eic_irq_ack(struct irq_data *data) { … } static int sprd_eic_irq_set_type(struct irq_data *data, unsigned int flow_type) { … } static void sprd_eic_toggle_trigger(struct gpio_chip *chip, unsigned int irq, unsigned int offset) { … } static void sprd_eic_handle_one_type(struct gpio_chip *chip) { … } static void sprd_eic_irq_handler(struct irq_desc *desc) { … } static int sprd_eic_irq_notify(struct notifier_block *nb, unsigned long action, void *data) { … } static const struct irq_chip sprd_eic_irq = …; static void sprd_eic_unregister_notifier(void *data) { … } static int sprd_eic_probe(struct platform_device *pdev) { … } static const struct of_device_id sprd_eic_of_match[] = …; MODULE_DEVICE_TABLE(of, sprd_eic_of_match); static struct platform_driver sprd_eic_driver = …; module_platform_driver(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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