diff options
Diffstat (limited to 'drivers/gpio/gpio-vf610.c')
| -rw-r--r-- | drivers/gpio/gpio-vf610.c | 361 |
1 files changed, 361 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-vf610.c b/drivers/gpio/gpio-vf610.c new file mode 100644 index 0000000000..656d6b1ddd --- /dev/null +++ b/drivers/gpio/gpio-vf610.c @@ -0,0 +1,361 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Freescale vf610 GPIO support through PORT and GPIO + * + * Copyright (c) 2014 Toradex AG. + * + * Author: Stefan Agner <stefan@agner.ch>. + */ +#include <linux/bitops.h> +#include <linux/clk.h> +#include <linux/err.h> +#include <linux/gpio/driver.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/ioport.h> +#include <linux/irq.h> +#include <linux/platform_device.h> +#include <linux/of.h> +#include <linux/of_irq.h> +#include <linux/pinctrl/consumer.h> + +#define VF610_GPIO_PER_PORT 32 + +struct fsl_gpio_soc_data { + /* SoCs has a Port Data Direction Register (PDDR) */ + bool have_paddr; +}; + +struct vf610_gpio_port { + struct gpio_chip gc; + void __iomem *base; + void __iomem *gpio_base; + const struct fsl_gpio_soc_data *sdata; + u8 irqc[VF610_GPIO_PER_PORT]; + struct clk *clk_port; + struct clk *clk_gpio; + int irq; +}; + +#define GPIO_PDOR 0x00 +#define GPIO_PSOR 0x04 +#define GPIO_PCOR 0x08 +#define GPIO_PTOR 0x0c +#define GPIO_PDIR 0x10 +#define GPIO_PDDR 0x14 + +#define PORT_PCR(n) ((n) * 0x4) +#define PORT_PCR_IRQC_OFFSET 16 + +#define PORT_ISFR 0xa0 +#define PORT_DFER 0xc0 +#define PORT_DFCR 0xc4 +#define PORT_DFWR 0xc8 + +#define PORT_INT_OFF 0x0 +#define PORT_INT_LOGIC_ZERO 0x8 +#define PORT_INT_RISING_EDGE 0x9 +#define PORT_INT_FALLING_EDGE 0xa +#define PORT_INT_EITHER_EDGE 0xb +#define PORT_INT_LOGIC_ONE 0xc + +static const struct fsl_gpio_soc_data imx_data = { + .have_paddr = true, +}; + +static const struct of_device_id vf610_gpio_dt_ids[] = { + { .compatible = "fsl,vf610-gpio", .data = NULL, }, + { .compatible = "fsl,imx7ulp-gpio", .data = &imx_data, }, + { /* sentinel */ } +}; + +static inline void vf610_gpio_writel(u32 val, void __iomem *reg) +{ + writel_relaxed(val, reg); +} + +static inline u32 vf610_gpio_readl(void __iomem *reg) +{ + return readl_relaxed(reg); +} + +static int vf610_gpio_get(struct gpio_chip *gc, unsigned int gpio) +{ + struct vf610_gpio_port *port = gpiochip_get_data(gc); + unsigned long mask = BIT(gpio); + unsigned long offset = GPIO_PDIR; + + if (port->sdata && port->sdata->have_paddr) { + mask &= vf610_gpio_readl(port->gpio_base + GPIO_PDDR); + if (mask) + offset = GPIO_PDOR; + } + + return !!(vf610_gpio_readl(port->gpio_base + offset) & BIT(gpio)); +} + +static void vf610_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val) +{ + struct vf610_gpio_port *port = gpiochip_get_data(gc); + unsigned long mask = BIT(gpio); + unsigned long offset = val ? GPIO_PSOR : GPIO_PCOR; + + vf610_gpio_writel(mask, port->gpio_base + offset); +} + +static int vf610_gpio_direction_input(struct gpio_chip *chip, unsigned gpio) +{ + struct vf610_gpio_port *port = gpiochip_get_data(chip); + unsigned long mask = BIT(gpio); + u32 val; + + if (port->sdata && port->sdata->have_paddr) { + val = vf610_gpio_readl(port->gpio_base + GPIO_PDDR); + val &= ~mask; + vf610_gpio_writel(val, port->gpio_base + GPIO_PDDR); + } + + return pinctrl_gpio_direction_input(chip->base + gpio); +} + +static int vf610_gpio_direction_output(struct gpio_chip *chip, unsigned gpio, + int value) +{ + struct vf610_gpio_port *port = gpiochip_get_data(chip); + unsigned long mask = BIT(gpio); + u32 val; + + vf610_gpio_set(chip, gpio, value); + + if (port->sdata && port->sdata->have_paddr) { + val = vf610_gpio_readl(port->gpio_base + GPIO_PDDR); + val |= mask; + vf610_gpio_writel(val, port->gpio_base + GPIO_PDDR); + } + + return pinctrl_gpio_direction_output(chip->base + gpio); +} + +static void vf610_gpio_irq_handler(struct irq_desc *desc) +{ + struct vf610_gpio_port *port = + gpiochip_get_data(irq_desc_get_handler_data(desc)); + struct irq_chip *chip = irq_desc_get_chip(desc); + int pin; + unsigned long irq_isfr; + + chained_irq_enter(chip, desc); + + irq_isfr = vf610_gpio_readl(port->base + PORT_ISFR); + + for_each_set_bit(pin, &irq_isfr, VF610_GPIO_PER_PORT) { + vf610_gpio_writel(BIT(pin), port->base + PORT_ISFR); + + generic_handle_domain_irq(port->gc.irq.domain, pin); + } + + chained_irq_exit(chip, desc); +} + +static void vf610_gpio_irq_ack(struct irq_data *d) +{ + struct vf610_gpio_port *port = + gpiochip_get_data(irq_data_get_irq_chip_data(d)); + int gpio = d->hwirq; + + vf610_gpio_writel(BIT(gpio), port->base + PORT_ISFR); +} + +static int vf610_gpio_irq_set_type(struct irq_data *d, u32 type) +{ + struct vf610_gpio_port *port = + gpiochip_get_data(irq_data_get_irq_chip_data(d)); + u8 irqc; + + switch (type) { + case IRQ_TYPE_EDGE_RISING: + irqc = PORT_INT_RISING_EDGE; + break; + case IRQ_TYPE_EDGE_FALLING: + irqc = PORT_INT_FALLING_EDGE; + break; + case IRQ_TYPE_EDGE_BOTH: + irqc = PORT_INT_EITHER_EDGE; + break; + case IRQ_TYPE_LEVEL_LOW: + irqc = PORT_INT_LOGIC_ZERO; + break; + case IRQ_TYPE_LEVEL_HIGH: + irqc = PORT_INT_LOGIC_ONE; + break; + default: + return -EINVAL; + } + + port->irqc[d->hwirq] = irqc; + + if (type & IRQ_TYPE_LEVEL_MASK) + irq_set_handler_locked(d, handle_level_irq); + else + irq_set_handler_locked(d, handle_edge_irq); + + return 0; +} + +static void vf610_gpio_irq_mask(struct irq_data *d) +{ + struct gpio_chip *gc = irq_data_get_irq_chip_data(d); + struct vf610_gpio_port *port = gpiochip_get_data(gc); + irq_hw_number_t gpio_num = irqd_to_hwirq(d); + void __iomem *pcr_base = port->base + PORT_PCR(gpio_num); + + vf610_gpio_writel(0, pcr_base); + gpiochip_disable_irq(gc, gpio_num); +} + +static void vf610_gpio_irq_unmask(struct irq_data *d) +{ + struct gpio_chip *gc = irq_data_get_irq_chip_data(d); + struct vf610_gpio_port *port = gpiochip_get_data(gc); + irq_hw_number_t gpio_num = irqd_to_hwirq(d); + void __iomem *pcr_base = port->base + PORT_PCR(gpio_num); + + gpiochip_enable_irq(gc, gpio_num); + vf610_gpio_writel(port->irqc[gpio_num] << PORT_PCR_IRQC_OFFSET, + pcr_base); +} + +static int vf610_gpio_irq_set_wake(struct irq_data *d, u32 enable) +{ + struct vf610_gpio_port *port = + gpiochip_get_data(irq_data_get_irq_chip_data(d)); + + if (enable) + enable_irq_wake(port->irq); + else + disable_irq_wake(port->irq); + + return 0; +} + +static const struct irq_chip vf610_irqchip = { + .name = "gpio-vf610", + .irq_ack = vf610_gpio_irq_ack, + .irq_mask = vf610_gpio_irq_mask, + .irq_unmask = vf610_gpio_irq_unmask, + .irq_set_type = vf610_gpio_irq_set_type, + .irq_set_wake = vf610_gpio_irq_set_wake, + .flags = IRQCHIP_IMMUTABLE | IRQCHIP_MASK_ON_SUSPEND + | IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND, + GPIOCHIP_IRQ_RESOURCE_HELPERS, +}; + +static void vf610_gpio_disable_clk(void *data) +{ + clk_disable_unprepare(data); +} + +static int vf610_gpio_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct vf610_gpio_port *port; + struct gpio_chip *gc; + struct gpio_irq_chip *girq; + int i; + int ret; + + port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL); + if (!port) + return -ENOMEM; + + port->sdata = of_device_get_match_data(dev); + port->base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(port->base)) + return PTR_ERR(port->base); + + port->gpio_base = devm_platform_ioremap_resource(pdev, 1); + if (IS_ERR(port->gpio_base)) + return PTR_ERR(port->gpio_base); + + port->irq = platform_get_irq(pdev, 0); + if (port->irq < 0) + return port->irq; + + port->clk_port = devm_clk_get(dev, "port"); + ret = PTR_ERR_OR_ZERO(port->clk_port); + if (!ret) { + ret = clk_prepare_enable(port->clk_port); + if (ret) + return ret; + ret = devm_add_action_or_reset(dev, vf610_gpio_disable_clk, + port->clk_port); + if (ret) + return ret; + } else if (ret == -EPROBE_DEFER) { + /* + * Percolate deferrals, for anything else, + * just live without the clocking. + */ + return ret; + } + + port->clk_gpio = devm_clk_get(dev, "gpio"); + ret = PTR_ERR_OR_ZERO(port->clk_gpio); + if (!ret) { + ret = clk_prepare_enable(port->clk_gpio); + if (ret) + return ret; + ret = devm_add_action_or_reset(dev, vf610_gpio_disable_clk, + port->clk_gpio); + if (ret) + return ret; + } else if (ret == -EPROBE_DEFER) { + return ret; + } + + gc = &port->gc; + gc->parent = dev; + gc->label = dev_name(dev); + gc->ngpio = VF610_GPIO_PER_PORT; + gc->base = -1; + + gc->request = gpiochip_generic_request; + gc->free = gpiochip_generic_free; + gc->direction_input = vf610_gpio_direction_input; + gc->get = vf610_gpio_get; + gc->direction_output = vf610_gpio_direction_output; + gc->set = vf610_gpio_set; + + /* Mask all GPIO interrupts */ + for (i = 0; i < gc->ngpio; i++) + vf610_gpio_writel(0, port->base + PORT_PCR(i)); + + /* Clear the interrupt status register for all GPIO's */ + vf610_gpio_writel(~0, port->base + PORT_ISFR); + + girq = &gc->irq; + gpio_irq_chip_set_chip(girq, &vf610_irqchip); + girq->parent_handler = vf610_gpio_irq_handler; + girq->num_parents = 1; + girq->parents = devm_kcalloc(&pdev->dev, 1, + sizeof(*girq->parents), + GFP_KERNEL); + if (!girq->parents) + return -ENOMEM; + girq->parents[0] = port->irq; + girq->default_type = IRQ_TYPE_NONE; + girq->handler = handle_edge_irq; + + return devm_gpiochip_add_data(dev, gc, port); +} + +static struct platform_driver vf610_gpio_driver = { + .driver = { + .name = "gpio-vf610", + .of_match_table = vf610_gpio_dt_ids, + }, + .probe = vf610_gpio_probe, +}; + +builtin_platform_driver(vf610_gpio_driver); |