// SPDX-License-Identifier: GPL-2.0 /* * Copyright (C) 2020-2021 NVIDIA CORPORATION & AFFILIATES */ #include <linux/bitfield.h> #include <linux/bitops.h> #include <linux/device.h> #include <linux/gpio/driver.h> #include <linux/interrupt.h> #include <linux/io.h> #include <linux/ioport.h> #include <linux/kernel.h> #include <linux/mod_devicetable.h> #include <linux/module.h> #include <linux/platform_device.h> #include <linux/pm.h> #include <linux/resource.h> #include <linux/seq_file.h> #include <linux/spinlock.h> #include <linux/types.h> /* * There are 3 YU GPIO blocks: * gpio[0]: HOST_GPIO0->HOST_GPIO31 * gpio[1]: HOST_GPIO32->HOST_GPIO63 * gpio[2]: HOST_GPIO64->HOST_GPIO69 */ #define MLXBF2_GPIO_MAX_PINS_PER_BLOCK … /* * arm_gpio_lock register: * bit[31] lock status: active if set * bit[15:0] set lock * The lock is enabled only if 0xd42f is written to this field */ #define YU_ARM_GPIO_LOCK_ADDR … #define YU_ARM_GPIO_LOCK_SIZE … #define YU_LOCK_ACTIVE_BIT(val) … #define YU_ARM_GPIO_LOCK_ACQUIRE … #define YU_ARM_GPIO_LOCK_RELEASE … /* * gpio[x] block registers and their offset */ #define YU_GPIO_DATAIN … #define YU_GPIO_MODE1 … #define YU_GPIO_MODE0 … #define YU_GPIO_DATASET … #define YU_GPIO_DATACLEAR … #define YU_GPIO_CAUSE_RISE_EN … #define YU_GPIO_CAUSE_FALL_EN … #define YU_GPIO_MODE1_CLEAR … #define YU_GPIO_MODE0_SET … #define YU_GPIO_MODE0_CLEAR … #define YU_GPIO_CAUSE_OR_CAUSE_EVTEN0 … #define YU_GPIO_CAUSE_OR_EVTEN0 … #define YU_GPIO_CAUSE_OR_CLRCAUSE … struct mlxbf2_gpio_context_save_regs { … }; /* BlueField-2 gpio block context structure. */ struct mlxbf2_gpio_context { … }; /* BlueField-2 gpio shared structure. */ struct mlxbf2_gpio_param { … }; static struct resource yu_arm_gpio_lock_res = …; static DEFINE_MUTEX(yu_arm_gpio_lock_mutex); static struct mlxbf2_gpio_param yu_arm_gpio_lock_param = …; /* Request memory region and map yu_arm_gpio_lock resource */ static int mlxbf2_gpio_get_lock_res(struct platform_device *pdev) { … } /* * Acquire the YU arm_gpio_lock to be able to change the direction * mode. If the lock_active bit is already set, return an error. */ static int mlxbf2_gpio_lock_acquire(struct mlxbf2_gpio_context *gs) { … } /* * Release the YU arm_gpio_lock after changing the direction mode. */ static void mlxbf2_gpio_lock_release(struct mlxbf2_gpio_context *gs) __releases(&gs->gc.bgpio_lock) __releases(yu_arm_gpio_lock_param.lock) { … } /* * mode0 and mode1 are both locked by the gpio_lock field. * * Together, mode0 and mode1 define the gpio Mode dependeing also * on Reg_DataOut. * * {mode1,mode0}:{Reg_DataOut=0,Reg_DataOut=1}->{DataOut=0,DataOut=1} * * {0,0}:Reg_DataOut{0,1}->{Z,Z} Input PAD * {0,1}:Reg_DataOut{0,1}->{0,1} Full drive Output PAD * {1,0}:Reg_DataOut{0,1}->{0,Z} 0-set PAD to low, 1-float * {1,1}:Reg_DataOut{0,1}->{Z,1} 0-float, 1-set PAD to high */ /* * Set input direction: * {mode1,mode0} = {0,0} */ static int mlxbf2_gpio_direction_input(struct gpio_chip *chip, unsigned int offset) { … } /* * Set output direction: * {mode1,mode0} = {0,1} */ static int mlxbf2_gpio_direction_output(struct gpio_chip *chip, unsigned int offset, int value) { … } static void mlxbf2_gpio_irq_enable(struct irq_data *irqd) { … } static void mlxbf2_gpio_irq_disable(struct irq_data *irqd) { … } static irqreturn_t mlxbf2_gpio_irq_handler(int irq, void *ptr) { … } static int mlxbf2_gpio_irq_set_type(struct irq_data *irqd, unsigned int type) { … } static void mlxbf2_gpio_irq_print_chip(struct irq_data *irqd, struct seq_file *p) { … } static const struct irq_chip mlxbf2_gpio_irq_chip = …; /* BlueField-2 GPIO driver initialization routine. */ static int mlxbf2_gpio_probe(struct platform_device *pdev) { … } static int __maybe_unused mlxbf2_gpio_suspend(struct device *dev) { … } static int __maybe_unused mlxbf2_gpio_resume(struct device *dev) { … } static SIMPLE_DEV_PM_OPS(mlxbf2_pm_ops, mlxbf2_gpio_suspend, mlxbf2_gpio_resume); static const struct acpi_device_id __maybe_unused mlxbf2_gpio_acpi_match[] = …; MODULE_DEVICE_TABLE(acpi, mlxbf2_gpio_acpi_match); static struct platform_driver mlxbf2_gpio_driver = …; module_platform_driver(…) …; MODULE_DESCRIPTION(…) …; MODULE_AUTHOR(…) …; MODULE_LICENSE(…) …;
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