// SPDX-License-Identifier: GPL-2.0+ // // MXC GPIO support. (c) 2008 Daniel Mack <[email protected]> // Copyright 2008 Juergen Beisert, [email protected] // // Based on code from Freescale Semiconductor, // Authors: Daniel Mack, Juergen Beisert. // Copyright (C) 2004-2010 Freescale Semiconductor, Inc. All Rights Reserved. #include <linux/clk.h> #include <linux/err.h> #include <linux/init.h> #include <linux/interrupt.h> #include <linux/io.h> #include <linux/irq.h> #include <linux/irqdomain.h> #include <linux/irqchip/chained_irq.h> #include <linux/module.h> #include <linux/platform_device.h> #include <linux/pm_runtime.h> #include <linux/slab.h> #include <linux/spinlock.h> #include <linux/syscore_ops.h> #include <linux/gpio/driver.h> #include <linux/of.h> #include <linux/bug.h> #define IMX_SCU_WAKEUP_OFF … #define IMX_SCU_WAKEUP_LOW_LVL … #define IMX_SCU_WAKEUP_FALL_EDGE … #define IMX_SCU_WAKEUP_RISE_EDGE … #define IMX_SCU_WAKEUP_HIGH_LVL … /* device type dependent stuff */ struct mxc_gpio_hwdata { … }; struct mxc_gpio_reg_saved { … }; struct mxc_gpio_port { … }; static struct mxc_gpio_hwdata imx1_imx21_gpio_hwdata = …; static struct mxc_gpio_hwdata imx31_gpio_hwdata = …; static struct mxc_gpio_hwdata imx35_gpio_hwdata = …; #define GPIO_DR … #define GPIO_GDIR … #define GPIO_PSR … #define GPIO_ICR1 … #define GPIO_ICR2 … #define GPIO_IMR … #define GPIO_ISR … #define GPIO_EDGE_SEL … #define GPIO_INT_LOW_LEV … #define GPIO_INT_HIGH_LEV … #define GPIO_INT_RISE_EDGE … #define GPIO_INT_FALL_EDGE … #define GPIO_INT_BOTH_EDGES … static const struct of_device_id mxc_gpio_dt_ids[] = …; MODULE_DEVICE_TABLE(of, mxc_gpio_dt_ids); /* * MX2 has one interrupt *for all* gpio ports. The list is used * to save the references to all ports, so that mx2_gpio_irq_handler * can walk through all interrupt status registers. */ static LIST_HEAD(mxc_gpio_ports); /* Note: This driver assumes 32 GPIOs are handled in one register */ static int gpio_set_irq_type(struct irq_data *d, u32 type) { … } static void mxc_flip_edge(struct mxc_gpio_port *port, u32 gpio) { … } /* handle 32 interrupts in one status register */ static void mxc_gpio_irq_handler(struct mxc_gpio_port *port, u32 irq_stat) { … } /* MX1 and MX3 has one interrupt *per* gpio port */ static void mx3_gpio_irq_handler(struct irq_desc *desc) { … } /* MX2 has one interrupt *for all* gpio ports */ static void mx2_gpio_irq_handler(struct irq_desc *desc) { … } /* * Set interrupt number "irq" in the GPIO as a wake-up source. * While system is running, all registered GPIO interrupts need to have * wake-up enabled. When system is suspended, only selected GPIO interrupts * need to have wake-up enabled. * @param irq interrupt source number * @param enable enable as wake-up if equal to non-zero * @return This function returns 0 on success. */ static int gpio_set_wake_irq(struct irq_data *d, u32 enable) { … } static int mxc_gpio_init_gc(struct mxc_gpio_port *port, int irq_base) { … } static int mxc_gpio_to_irq(struct gpio_chip *gc, unsigned offset) { … } static int mxc_gpio_request(struct gpio_chip *chip, unsigned int offset) { … } static void mxc_gpio_free(struct gpio_chip *chip, unsigned int offset) { … } static void mxc_update_irq_chained_handler(struct mxc_gpio_port *port, bool enable) { … } static int mxc_gpio_probe(struct platform_device *pdev) { … } static void mxc_gpio_save_regs(struct mxc_gpio_port *port) { … } static void mxc_gpio_restore_regs(struct mxc_gpio_port *port) { … } static bool mxc_gpio_generic_config(struct mxc_gpio_port *port, unsigned int offset, unsigned long conf) { … } static bool mxc_gpio_set_pad_wakeup(struct mxc_gpio_port *port, bool enable) { … } static int mxc_gpio_runtime_suspend(struct device *dev) { … } static int mxc_gpio_runtime_resume(struct device *dev) { … } static int mxc_gpio_noirq_suspend(struct device *dev) { … } static int mxc_gpio_noirq_resume(struct device *dev) { … } static const struct dev_pm_ops mxc_gpio_dev_pm_ops = …; static int mxc_gpio_syscore_suspend(void) { … } static void mxc_gpio_syscore_resume(void) { … } static struct syscore_ops mxc_gpio_syscore_ops = …; static struct platform_driver mxc_gpio_driver = …; static int __init gpio_mxc_init(void) { … } subsys_initcall(gpio_mxc_init); MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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