/* * Xilinx Zynq GPIO device driver * * Copyright (C) 2009 - 2014 Xilinx, Inc. * * This program is free software; you can redistribute it and/or modify it under * the terms of the GNU General Public License as published by the Free Software * Foundation; either version 2 of the License, or (at your option) any later * version. */ #include #include #include #include #include #include #include #include #include #define DRIVER_NAME "zynq-gpio" /* Maximum banks */ #define ZYNQ_GPIO_MAX_BANK 4 #define ZYNQ_GPIO_BANK0_NGPIO 32 #define ZYNQ_GPIO_BANK1_NGPIO 22 #define ZYNQ_GPIO_BANK2_NGPIO 32 #define ZYNQ_GPIO_BANK3_NGPIO 32 #define ZYNQ_GPIO_NR_GPIOS (ZYNQ_GPIO_BANK0_NGPIO + \ ZYNQ_GPIO_BANK1_NGPIO + \ ZYNQ_GPIO_BANK2_NGPIO + \ ZYNQ_GPIO_BANK3_NGPIO) #define ZYNQ_GPIO_BANK0_PIN_MIN 0 #define ZYNQ_GPIO_BANK0_PIN_MAX (ZYNQ_GPIO_BANK0_PIN_MIN + \ ZYNQ_GPIO_BANK0_NGPIO - 1) #define ZYNQ_GPIO_BANK1_PIN_MIN (ZYNQ_GPIO_BANK0_PIN_MAX + 1) #define ZYNQ_GPIO_BANK1_PIN_MAX (ZYNQ_GPIO_BANK1_PIN_MIN + \ ZYNQ_GPIO_BANK1_NGPIO - 1) #define ZYNQ_GPIO_BANK2_PIN_MIN (ZYNQ_GPIO_BANK1_PIN_MAX + 1) #define ZYNQ_GPIO_BANK2_PIN_MAX (ZYNQ_GPIO_BANK2_PIN_MIN + \ ZYNQ_GPIO_BANK2_NGPIO - 1) #define ZYNQ_GPIO_BANK3_PIN_MIN (ZYNQ_GPIO_BANK2_PIN_MAX + 1) #define ZYNQ_GPIO_BANK3_PIN_MAX (ZYNQ_GPIO_BANK3_PIN_MIN + \ ZYNQ_GPIO_BANK3_NGPIO - 1) /* Register offsets for the GPIO device */ /* LSW Mask & Data -WO */ #define ZYNQ_GPIO_DATA_LSW_OFFSET(BANK) (0x000 + (8 * BANK)) /* MSW Mask & Data -WO */ #define ZYNQ_GPIO_DATA_MSW_OFFSET(BANK) (0x004 + (8 * BANK)) /* Data Register-RW */ #define ZYNQ_GPIO_DATA_RO_OFFSET(BANK) (0x060 + (4 * BANK)) /* Direction mode reg-RW */ #define ZYNQ_GPIO_DIRM_OFFSET(BANK) (0x204 + (0x40 * BANK)) /* Output enable reg-RW */ #define ZYNQ_GPIO_OUTEN_OFFSET(BANK) (0x208 + (0x40 * BANK)) /* Interrupt mask reg-RO */ #define ZYNQ_GPIO_INTMASK_OFFSET(BANK) (0x20C + (0x40 * BANK)) /* Interrupt enable reg-WO */ #define ZYNQ_GPIO_INTEN_OFFSET(BANK) (0x210 + (0x40 * BANK)) /* Interrupt disable reg-WO */ #define ZYNQ_GPIO_INTDIS_OFFSET(BANK) (0x214 + (0x40 * BANK)) /* Interrupt status reg-RO */ #define ZYNQ_GPIO_INTSTS_OFFSET(BANK) (0x218 + (0x40 * BANK)) /* Interrupt type reg-RW */ #define ZYNQ_GPIO_INTTYPE_OFFSET(BANK) (0x21C + (0x40 * BANK)) /* Interrupt polarity reg-RW */ #define ZYNQ_GPIO_INTPOL_OFFSET(BANK) (0x220 + (0x40 * BANK)) /* Interrupt on any, reg-RW */ #define ZYNQ_GPIO_INTANY_OFFSET(BANK) (0x224 + (0x40 * BANK)) /* Disable all interrupts mask */ #define ZYNQ_GPIO_IXR_DISABLE_ALL 0xFFFFFFFF /* Mid pin number of a bank */ #define ZYNQ_GPIO_MID_PIN_NUM 16 /* GPIO upper 16 bit mask */ #define ZYNQ_GPIO_UPPER_MASK 0xFFFF0000 /** * struct zynq_gpio - gpio device private data structure * @chip: instance of the gpio_chip * @base_addr: base address of the GPIO device * @clk: clock resource for this controller * @irq: interrupt for the GPIO device */ struct zynq_gpio { struct gpio_chip chip; void __iomem *base_addr; struct clk *clk; int irq; }; static struct irq_chip zynq_gpio_level_irqchip; static struct irq_chip zynq_gpio_edge_irqchip; /** * zynq_gpio_get_bank_pin - Get the bank number and pin number within that bank * for a given pin in the GPIO device * @pin_num: gpio pin number within the device * @bank_num: an output parameter used to return the bank number of the gpio * pin * @bank_pin_num: an output parameter used to return pin number within a bank * for the given gpio pin * * Returns the bank number and pin offset within the bank. */ static inline void zynq_gpio_get_bank_pin(unsigned int pin_num, unsigned int *bank_num, unsigned int *bank_pin_num) { switch (pin_num) { case ZYNQ_GPIO_BANK0_PIN_MIN ... ZYNQ_GPIO_BANK0_PIN_MAX: *bank_num = 0; *bank_pin_num = pin_num; break; case ZYNQ_GPIO_BANK1_PIN_MIN ... ZYNQ_GPIO_BANK1_PIN_MAX: *bank_num = 1; *bank_pin_num = pin_num - ZYNQ_GPIO_BANK1_PIN_MIN; break; case ZYNQ_GPIO_BANK2_PIN_MIN ... ZYNQ_GPIO_BANK2_PIN_MAX: *bank_num = 2; *bank_pin_num = pin_num - ZYNQ_GPIO_BANK2_PIN_MIN; break; case ZYNQ_GPIO_BANK3_PIN_MIN ... ZYNQ_GPIO_BANK3_PIN_MAX: *bank_num = 3; *bank_pin_num = pin_num - ZYNQ_GPIO_BANK3_PIN_MIN; break; default: WARN(true, "invalid GPIO pin number: %u", pin_num); *bank_num = 0; *bank_pin_num = 0; break; } } static const unsigned int zynq_gpio_bank_offset[] = { ZYNQ_GPIO_BANK0_PIN_MIN, ZYNQ_GPIO_BANK1_PIN_MIN, ZYNQ_GPIO_BANK2_PIN_MIN, ZYNQ_GPIO_BANK3_PIN_MIN, }; /** * zynq_gpio_get_value - Get the state of the specified pin of GPIO device * @chip: gpio_chip instance to be worked on * @pin: gpio pin number within the device * * This function reads the state of the specified pin of the GPIO device. * * Return: 0 if the pin is low, 1 if pin is high. */ static int zynq_gpio_get_value(struct gpio_chip *chip, unsigned int pin) { u32 data; unsigned int bank_num, bank_pin_num; struct zynq_gpio *gpio = container_of(chip, struct zynq_gpio, chip); zynq_gpio_get_bank_pin(pin, &bank_num, &bank_pin_num); data = readl_relaxed(gpio->base_addr + ZYNQ_GPIO_DATA_RO_OFFSET(bank_num)); return (data >> bank_pin_num) & 1; } /** * zynq_gpio_set_value - Modify the state of the pin with specified value * @chip: gpio_chip instance to be worked on * @pin: gpio pin number within the device * @state: value used to modify the state of the specified pin * * This function calculates the register offset (i.e to lower 16 bits or * upper 16 bits) based on the given pin number and sets the state of a * gpio pin to the specified value. The state is either 0 or non-zero. */ static void zynq_gpio_set_value(struct gpio_chip *chip, unsigned int pin, int state) { unsigned int reg_offset, bank_num, bank_pin_num; struct zynq_gpio *gpio = container_of(chip, struct zynq_gpio, chip); zynq_gpio_get_bank_pin(pin, &bank_num, &bank_pin_num); if (bank_pin_num >= ZYNQ_GPIO_MID_PIN_NUM) { /* only 16 data bits in bit maskable reg */ bank_pin_num -= ZYNQ_GPIO_MID_PIN_NUM; reg_offset = ZYNQ_GPIO_DATA_MSW_OFFSET(bank_num); } else { reg_offset = ZYNQ_GPIO_DATA_LSW_OFFSET(bank_num); } /* * get the 32 bit value to be written to the mask/data register where * the upper 16 bits is the mask and lower 16 bits is the data */ state = !!state; state = ~(1 << (bank_pin_num + ZYNQ_GPIO_MID_PIN_NUM)) & ((state << bank_pin_num) | ZYNQ_GPIO_UPPER_MASK); writel_relaxed(state, gpio->base_addr + reg_offset); } /** * zynq_gpio_dir_in - Set the direction of the specified GPIO pin as input * @chip: gpio_chip instance to be worked on * @pin: gpio pin number within the device * * This function uses the read-modify-write sequence to set the direction of * the gpio pin as input. * * Return: 0 always */ static int zynq_gpio_dir_in(struct gpio_chip *chip, unsigned int pin) { u32 reg; unsigned int bank_num, bank_pin_num; struct zynq_gpio *gpio = container_of(chip, struct zynq_gpio, chip); zynq_gpio_get_bank_pin(pin, &bank_num, &bank_pin_num); /* bank 0 pins 7 and 8 are special and cannot be used as inputs */ if (bank_num == 0 && (bank_pin_num == 7 || bank_pin_num == 8)) return -EINVAL; /* clear the bit in direction mode reg to set the pin as input */ reg = readl_relaxed(gpio->base_addr + ZYNQ_GPIO_DIRM_OFFSET(bank_num)); reg &= ~BIT(bank_pin_num); writel_relaxed(reg, gpio->base_addr + ZYNQ_GPIO_DIRM_OFFSET(bank_num)); return 0; } /** * zynq_gpio_dir_out - Set the direction of the specified GPIO pin as output * @chip: gpio_chip instance to be worked on * @pin: gpio pin number within the device * @state: value to be written to specified pin * * This function sets the direction of specified GPIO pin as output, configures * the Output Enable register for the pin and uses zynq_gpio_set to set * the state of the pin to the value specified. * * Return: 0 always */ static int zynq_gpio_dir_out(struct gpio_chip *chip, unsigned int pin, int state) { u32 reg; unsigned int bank_num, bank_pin_num; struct zynq_gpio *gpio = container_of(chip, struct zynq_gpio, chip); zynq_gpio_get_bank_pin(pin, &bank_num, &bank_pin_num); /* set the GPIO pin as output */ reg = readl_relaxed(gpio->base_addr + ZYNQ_GPIO_DIRM_OFFSET(bank_num)); reg |= BIT(bank_pin_num); writel_relaxed(reg, gpio->base_addr + ZYNQ_GPIO_DIRM_OFFSET(bank_num)); /* configure the output enable reg for the pin */ reg = readl_relaxed(gpio->base_addr + ZYNQ_GPIO_OUTEN_OFFSET(bank_num)); reg |= BIT(bank_pin_num); writel_relaxed(reg, gpio->base_addr + ZYNQ_GPIO_OUTEN_OFFSET(bank_num)); /* set the state of the pin */ zynq_gpio_set_value(chip, pin, state); return 0; } /** * zynq_gpio_irq_mask - Disable the interrupts for a gpio pin * @irq_data: per irq and chip data passed down to chip functions * * This function calculates gpio pin number from irq number and sets the * bit in the Interrupt Disable register of the corresponding bank to disable * interrupts for that pin. */ static void zynq_gpio_irq_mask(struct irq_data *irq_data) { unsigned int device_pin_num, bank_num, bank_pin_num; struct zynq_gpio *gpio = irq_data_get_irq_chip_data(irq_data); device_pin_num = irq_data->hwirq; zynq_gpio_get_bank_pin(device_pin_num, &bank_num, &bank_pin_num); writel_relaxed(BIT(bank_pin_num), gpio->base_addr + ZYNQ_GPIO_INTDIS_OFFSET(bank_num)); } /** * zynq_gpio_irq_unmask - Enable the interrupts for a gpio pin * @irq_data: irq data containing irq number of gpio pin for the interrupt * to enable * * This function calculates the gpio pin number from irq number and sets the * bit in the Interrupt Enable register of the corresponding bank to enable * interrupts for that pin. */ static void zynq_gpio_irq_unmask(struct irq_data *irq_data) { unsigned int device_pin_num, bank_num, bank_pin_num; struct zynq_gpio *gpio = irq_data_get_irq_chip_data(irq_data); device_pin_num = irq_data->hwirq; zynq_gpio_get_bank_pin(device_pin_num, &bank_num, &bank_pin_num); writel_relaxed(BIT(bank_pin_num), gpio->base_addr + ZYNQ_GPIO_INTEN_OFFSET(bank_num)); } /** * zynq_gpio_irq_ack - Acknowledge the interrupt of a gpio pin * @irq_data: irq data containing irq number of gpio pin for the interrupt * to ack * * This function calculates gpio pin number from irq number and sets the bit * in the Interrupt Status Register of the corresponding bank, to ACK the irq. */ static void zynq_gpio_irq_ack(struct irq_data *irq_data) { unsigned int device_pin_num, bank_num, bank_pin_num; struct zynq_gpio *gpio = irq_data_get_irq_chip_data(irq_data); device_pin_num = irq_data->hwirq; zynq_gpio_get_bank_pin(device_pin_num, &bank_num, &bank_pin_num); writel_relaxed(BIT(bank_pin_num), gpio->base_addr + ZYNQ_GPIO_INTSTS_OFFSET(bank_num)); } /** * zynq_gpio_irq_enable - Enable the interrupts for a gpio pin * @irq_data: irq data containing irq number of gpio pin for the interrupt * to enable * * Clears the INTSTS bit and unmasks the given interrrupt. */ static void zynq_gpio_irq_enable(struct irq_data *irq_data) { /* * The Zynq GPIO controller does not disable interrupt detection when * the interrupt is masked and only disables the propagation of the * interrupt. This means when the controller detects an interrupt * condition while the interrupt is logically disabled it will propagate * that interrupt event once the interrupt is enabled. This will cause * the interrupt consumer to see spurious interrupts to prevent this * first make sure that the interrupt is not asserted and then enable * it. */ zynq_gpio_irq_ack(irq_data); zynq_gpio_irq_unmask(irq_data); } /** * zynq_gpio_set_irq_type - Set the irq type for a gpio pin * @irq_data: irq data containing irq number of gpio pin * @type: interrupt type that is to be set for the gpio pin * * This function gets the gpio pin number and its bank from the gpio pin number * and configures the INT_TYPE, INT_POLARITY and INT_ANY registers. * * Return: 0, negative error otherwise. * TYPE-EDGE_RISING, INT_TYPE - 1, INT_POLARITY - 1, INT_ANY - 0; * TYPE-EDGE_FALLING, INT_TYPE - 1, INT_POLARITY - 0, INT_ANY - 0; * TYPE-EDGE_BOTH, INT_TYPE - 1, INT_POLARITY - NA, INT_ANY - 1; * TYPE-LEVEL_HIGH, INT_TYPE - 0, INT_POLARITY - 1, INT_ANY - NA; * TYPE-LEVEL_LOW, INT_TYPE - 0, INT_POLARITY - 0, INT_ANY - NA */ static int zynq_gpio_set_irq_type(struct irq_data *irq_data, unsigned int type) { u32 int_type, int_pol, int_any; unsigned int device_pin_num, bank_num, bank_pin_num; struct zynq_gpio *gpio = irq_data_get_irq_chip_data(irq_data); device_pin_num = irq_data->hwirq; zynq_gpio_get_bank_pin(device_pin_num, &bank_num, &bank_pin_num); int_type = readl_relaxed(gpio->base_addr + ZYNQ_GPIO_INTTYPE_OFFSET(bank_num)); int_pol = readl_relaxed(gpio->base_addr + ZYNQ_GPIO_INTPOL_OFFSET(bank_num)); int_any = readl_relaxed(gpio->base_addr + ZYNQ_GPIO_INTANY_OFFSET(bank_num)); /* * based on the type requested, configure the INT_TYPE, INT_POLARITY * and INT_ANY registers */ switch (type) { case IRQ_TYPE_EDGE_RISING: int_type |= BIT(bank_pin_num); int_pol |= BIT(bank_pin_num); int_any &= ~BIT(bank_pin_num); break; case IRQ_TYPE_EDGE_FALLING: int_type |= BIT(bank_pin_num); int_pol &= ~BIT(bank_pin_num); int_any &= ~BIT(bank_pin_num); break; case IRQ_TYPE_EDGE_BOTH: int_type |= BIT(bank_pin_num); int_any |= BIT(bank_pin_num); break; case IRQ_TYPE_LEVEL_HIGH: int_type &= ~BIT(bank_pin_num); int_pol |= BIT(bank_pin_num); break; case IRQ_TYPE_LEVEL_LOW: int_type &= ~BIT(bank_pin_num); int_pol &= ~BIT(bank_pin_num); break; default: return -EINVAL; } writel_relaxed(int_type, gpio->base_addr + ZYNQ_GPIO_INTTYPE_OFFSET(bank_num)); writel_relaxed(int_pol, gpio->base_addr + ZYNQ_GPIO_INTPOL_OFFSET(bank_num)); writel_relaxed(int_any, gpio->base_addr + ZYNQ_GPIO_INTANY_OFFSET(bank_num)); if (type & IRQ_TYPE_LEVEL_MASK) { __irq_set_chip_handler_name_locked(irq_data->irq, &zynq_gpio_level_irqchip, handle_fasteoi_irq, NULL); } else { __irq_set_chip_handler_name_locked(irq_data->irq, &zynq_gpio_edge_irqchip, handle_level_irq, NULL); } return 0; } static int zynq_gpio_set_wake(struct irq_data *data, unsigned int on) { struct zynq_gpio *gpio = irq_data_get_irq_chip_data(data); irq_set_irq_wake(gpio->irq, on); return 0; } /* irq chip descriptor */ static struct irq_chip zynq_gpio_level_irqchip = { .name = DRIVER_NAME, .irq_enable = zynq_gpio_irq_enable, .irq_eoi = zynq_gpio_irq_ack, .irq_mask = zynq_gpio_irq_mask, .irq_unmask = zynq_gpio_irq_unmask, .irq_set_type = zynq_gpio_set_irq_type, .irq_set_wake = zynq_gpio_set_wake, .flags = IRQCHIP_EOI_THREADED | IRQCHIP_EOI_IF_HANDLED | IRQCHIP_MASK_ON_SUSPEND, }; static struct irq_chip zynq_gpio_edge_irqchip = { .name = DRIVER_NAME, .irq_enable = zynq_gpio_irq_enable, .irq_ack = zynq_gpio_irq_ack, .irq_mask = zynq_gpio_irq_mask, .irq_unmask = zynq_gpio_irq_unmask, .irq_set_type = zynq_gpio_set_irq_type, .irq_set_wake = zynq_gpio_set_wake, .flags = IRQCHIP_MASK_ON_SUSPEND, }; static void zynq_gpio_handle_bank_irq(struct zynq_gpio *gpio, unsigned int bank_num, unsigned long pending) { unsigned int bank_offset = zynq_gpio_bank_offset[bank_num]; struct irq_domain *irqdomain = gpio->chip.irqdomain; int offset; if (!pending) return; for_each_set_bit(offset, &pending, 32) { unsigned int gpio_irq; gpio_irq = irq_find_mapping(irqdomain, offset + bank_offset); generic_handle_irq(gpio_irq); } } /** * zynq_gpio_irqhandler - IRQ handler for the gpio banks of a gpio device * @irq: irq number of the gpio bank where interrupt has occurred * @desc: irq descriptor instance of the 'irq' * * This function reads the Interrupt Status Register of each bank to get the * gpio pin number which has triggered an interrupt. It then acks the triggered * interrupt and calls the pin specific handler set by the higher layer * application for that pin. * Note: A bug is reported if no handler is set for the gpio pin. */ static void zynq_gpio_irqhandler(unsigned int irq, struct irq_desc *desc) { u32 int_sts, int_enb; unsigned int bank_num; struct zynq_gpio *gpio = irq_get_handler_data(irq); struct irq_chip *irqchip = irq_desc_get_chip(desc); chained_irq_enter(irqchip, desc); for (bank_num = 0; bank_num < ZYNQ_GPIO_MAX_BANK; bank_num++) { int_sts = readl_relaxed(gpio->base_addr + ZYNQ_GPIO_INTSTS_OFFSET(bank_num)); int_enb = readl_relaxed(gpio->base_addr + ZYNQ_GPIO_INTMASK_OFFSET(bank_num)); zynq_gpio_handle_bank_irq(gpio, bank_num, int_sts & ~int_enb); } chained_irq_exit(irqchip, desc); } static int __maybe_unused zynq_gpio_suspend(struct device *dev) { struct platform_device *pdev = to_platform_device(dev); int irq = platform_get_irq(pdev, 0); struct irq_data *data = irq_get_irq_data(irq); if (!irqd_is_wakeup_set(data)) return pm_runtime_force_suspend(dev); return 0; } static int __maybe_unused zynq_gpio_resume(struct device *dev) { struct platform_device *pdev = to_platform_device(dev); int irq = platform_get_irq(pdev, 0); struct irq_data *data = irq_get_irq_data(irq); if (!irqd_is_wakeup_set(data)) return pm_runtime_force_resume(dev); return 0; } static int __maybe_unused zynq_gpio_runtime_suspend(struct device *dev) { struct platform_device *pdev = to_platform_device(dev); struct zynq_gpio *gpio = platform_get_drvdata(pdev); clk_disable_unprepare(gpio->clk); return 0; } static int __maybe_unused zynq_gpio_runtime_resume(struct device *dev) { struct platform_device *pdev = to_platform_device(dev); struct zynq_gpio *gpio = platform_get_drvdata(pdev); return clk_prepare_enable(gpio->clk); } static int zynq_gpio_request(struct gpio_chip *chip, unsigned offset) { int ret; ret = pm_runtime_get_sync(chip->dev); /* * If the device is already active pm_runtime_get() will return 1 on * success, but gpio_request still needs to return 0. */ return ret < 0 ? ret : 0; } static void zynq_gpio_free(struct gpio_chip *chip, unsigned offset) { pm_runtime_put(chip->dev); } static const struct dev_pm_ops zynq_gpio_dev_pm_ops = { SET_SYSTEM_SLEEP_PM_OPS(zynq_gpio_suspend, zynq_gpio_resume) SET_PM_RUNTIME_PM_OPS(zynq_gpio_runtime_suspend, zynq_gpio_runtime_resume, NULL) }; /** * zynq_gpio_probe - Initialization method for a zynq_gpio device * @pdev: platform device instance * * This function allocates memory resources for the gpio device and registers * all the banks of the device. It will also set up interrupts for the gpio * pins. * Note: Interrupts are disabled for all the banks during initialization. * * Return: 0 on success, negative error otherwise. */ static int zynq_gpio_probe(struct platform_device *pdev) { int ret, bank_num; struct zynq_gpio *gpio; struct gpio_chip *chip; struct resource *res; gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL); if (!gpio) return -ENOMEM; platform_set_drvdata(pdev, gpio); res = platform_get_resource(pdev, IORESOURCE_MEM, 0); gpio->base_addr = devm_ioremap_resource(&pdev->dev, res); if (IS_ERR(gpio->base_addr)) return PTR_ERR(gpio->base_addr); gpio->irq = platform_get_irq(pdev, 0); if (gpio->irq < 0) { dev_err(&pdev->dev, "invalid IRQ\n"); return gpio->irq; } /* configure the gpio chip */ chip = &gpio->chip; chip->label = "zynq_gpio"; chip->owner = THIS_MODULE; chip->dev = &pdev->dev; chip->get = zynq_gpio_get_value; chip->set = zynq_gpio_set_value; chip->request = zynq_gpio_request; chip->free = zynq_gpio_free; chip->direction_input = zynq_gpio_dir_in; chip->direction_output = zynq_gpio_dir_out; chip->base = -1; chip->ngpio = ZYNQ_GPIO_NR_GPIOS; /* Enable GPIO clock */ gpio->clk = devm_clk_get(&pdev->dev, NULL); if (IS_ERR(gpio->clk)) { dev_err(&pdev->dev, "input clock not found.\n"); return PTR_ERR(gpio->clk); } ret = clk_prepare_enable(gpio->clk); if (ret) { dev_err(&pdev->dev, "Unable to enable clock.\n"); return ret; } /* report a bug if gpio chip registration fails */ ret = gpiochip_add(chip); if (ret) { dev_err(&pdev->dev, "Failed to add gpio chip\n"); goto err_disable_clk; } /* disable interrupts for all banks */ for (bank_num = 0; bank_num < ZYNQ_GPIO_MAX_BANK; bank_num++) writel_relaxed(ZYNQ_GPIO_IXR_DISABLE_ALL, gpio->base_addr + ZYNQ_GPIO_INTDIS_OFFSET(bank_num)); ret = gpiochip_irqchip_add(chip, &zynq_gpio_edge_irqchip, 0, handle_level_irq, IRQ_TYPE_NONE); if (ret) { dev_err(&pdev->dev, "Failed to add irq chip\n"); goto err_rm_gpiochip; } gpiochip_set_chained_irqchip(chip, &zynq_gpio_edge_irqchip, gpio->irq, zynq_gpio_irqhandler); pm_runtime_set_active(&pdev->dev); pm_runtime_enable(&pdev->dev); return 0; err_rm_gpiochip: gpiochip_remove(chip); err_disable_clk: clk_disable_unprepare(gpio->clk); return ret; } /** * zynq_gpio_remove - Driver removal function * @pdev: platform device instance * * Return: 0 always */ static int zynq_gpio_remove(struct platform_device *pdev) { int ret; struct zynq_gpio *gpio = platform_get_drvdata(pdev); pm_runtime_get_sync(&pdev->dev); ret = gpiochip_remove(&gpio->chip); if (ret) { dev_err(&pdev->dev, "Failed to remove gpio chip\n"); return ret; } clk_disable_unprepare(gpio->clk); device_set_wakeup_capable(&pdev->dev, 0); return 0; } static struct of_device_id zynq_gpio_of_match[] = { { .compatible = "xlnx,zynq-gpio-1.0", }, { /* end of table */ } }; MODULE_DEVICE_TABLE(of, zynq_gpio_of_match); static struct platform_driver zynq_gpio_driver = { .driver = { .name = DRIVER_NAME, .pm = &zynq_gpio_dev_pm_ops, .of_match_table = zynq_gpio_of_match, }, .probe = zynq_gpio_probe, .remove = zynq_gpio_remove, }; /** * zynq_gpio_init - Initial driver registration call * * Return: value from platform_driver_register */ static int __init zynq_gpio_init(void) { return platform_driver_register(&zynq_gpio_driver); } postcore_initcall(zynq_gpio_init); MODULE_AUTHOR("Xilinx Inc."); MODULE_DESCRIPTION("Zynq GPIO driver"); MODULE_LICENSE("GPL");