diff options
Diffstat (limited to 'drivers/gpio/gpio-gemini.c')
| -rw-r--r-- | drivers/gpio/gpio-gemini.c | 236 |
1 files changed, 0 insertions, 236 deletions
diff --git a/drivers/gpio/gpio-gemini.c b/drivers/gpio/gpio-gemini.c deleted file mode 100644 index 962485163b7f..000000000000 --- a/drivers/gpio/gpio-gemini.c +++ /dev/null @@ -1,236 +0,0 @@ -/* - * Gemini gpiochip and interrupt routines - * Copyright (C) 2017 Linus Walleij <linus.walleij@linaro.org> - * - * Based on arch/arm/mach-gemini/gpio.c: - * Copyright (C) 2008-2009 Paulius Zaleckas <paulius.zaleckas@teltonika.lt> - * - * Based on plat-mxc/gpio.c: - * MXC GPIO support. (c) 2008 Daniel Mack <daniel@caiaq.de> - * Copyright 2008 Juergen Beisert, kernel@pengutronix.de - */ -#include <linux/gpio/driver.h> -#include <linux/io.h> -#include <linux/interrupt.h> -#include <linux/platform_device.h> -#include <linux/of_gpio.h> -#include <linux/bitops.h> - -/* GPIO registers definition */ -#define GPIO_DATA_OUT 0x00 -#define GPIO_DATA_IN 0x04 -#define GPIO_DIR 0x08 -#define GPIO_DATA_SET 0x10 -#define GPIO_DATA_CLR 0x14 -#define GPIO_PULL_EN 0x18 -#define GPIO_PULL_TYPE 0x1C -#define GPIO_INT_EN 0x20 -#define GPIO_INT_STAT 0x24 -#define GPIO_INT_MASK 0x2C -#define GPIO_INT_CLR 0x30 -#define GPIO_INT_TYPE 0x34 -#define GPIO_INT_BOTH_EDGE 0x38 -#define GPIO_INT_LEVEL 0x3C -#define GPIO_DEBOUNCE_EN 0x40 -#define GPIO_DEBOUNCE_PRESCALE 0x44 - -/** - * struct gemini_gpio - Gemini GPIO state container - * @dev: containing device for this instance - * @gc: gpiochip for this instance - */ -struct gemini_gpio { - struct device *dev; - struct gpio_chip gc; - void __iomem *base; -}; - -static void gemini_gpio_ack_irq(struct irq_data *d) -{ - struct gpio_chip *gc = irq_data_get_irq_chip_data(d); - struct gemini_gpio *g = gpiochip_get_data(gc); - - writel(BIT(irqd_to_hwirq(d)), g->base + GPIO_INT_CLR); -} - -static void gemini_gpio_mask_irq(struct irq_data *d) -{ - struct gpio_chip *gc = irq_data_get_irq_chip_data(d); - struct gemini_gpio *g = gpiochip_get_data(gc); - u32 val; - - val = readl(g->base + GPIO_INT_EN); - val &= ~BIT(irqd_to_hwirq(d)); - writel(val, g->base + GPIO_INT_EN); -} - -static void gemini_gpio_unmask_irq(struct irq_data *d) -{ - struct gpio_chip *gc = irq_data_get_irq_chip_data(d); - struct gemini_gpio *g = gpiochip_get_data(gc); - u32 val; - - val = readl(g->base + GPIO_INT_EN); - val |= BIT(irqd_to_hwirq(d)); - writel(val, g->base + GPIO_INT_EN); -} - -static int gemini_gpio_set_irq_type(struct irq_data *d, unsigned int type) -{ - struct gpio_chip *gc = irq_data_get_irq_chip_data(d); - struct gemini_gpio *g = gpiochip_get_data(gc); - u32 mask = BIT(irqd_to_hwirq(d)); - u32 reg_both, reg_level, reg_type; - - reg_type = readl(g->base + GPIO_INT_TYPE); - reg_level = readl(g->base + GPIO_INT_LEVEL); - reg_both = readl(g->base + GPIO_INT_BOTH_EDGE); - - switch (type) { - case IRQ_TYPE_EDGE_BOTH: - irq_set_handler_locked(d, handle_edge_irq); - reg_type &= ~mask; - reg_both |= mask; - break; - case IRQ_TYPE_EDGE_RISING: - irq_set_handler_locked(d, handle_edge_irq); - reg_type &= ~mask; - reg_both &= ~mask; - reg_level &= ~mask; - break; - case IRQ_TYPE_EDGE_FALLING: - irq_set_handler_locked(d, handle_edge_irq); - reg_type &= ~mask; - reg_both &= ~mask; - reg_level |= mask; - break; - case IRQ_TYPE_LEVEL_HIGH: - irq_set_handler_locked(d, handle_level_irq); - reg_type |= mask; - reg_level &= ~mask; - break; - case IRQ_TYPE_LEVEL_LOW: - irq_set_handler_locked(d, handle_level_irq); - reg_type |= mask; - reg_level |= mask; - break; - default: - irq_set_handler_locked(d, handle_bad_irq); - return -EINVAL; - } - - writel(reg_type, g->base + GPIO_INT_TYPE); - writel(reg_level, g->base + GPIO_INT_LEVEL); - writel(reg_both, g->base + GPIO_INT_BOTH_EDGE); - - gemini_gpio_ack_irq(d); - - return 0; -} - -static struct irq_chip gemini_gpio_irqchip = { - .name = "GPIO", - .irq_ack = gemini_gpio_ack_irq, - .irq_mask = gemini_gpio_mask_irq, - .irq_unmask = gemini_gpio_unmask_irq, - .irq_set_type = gemini_gpio_set_irq_type, -}; - -static void gemini_gpio_irq_handler(struct irq_desc *desc) -{ - struct gpio_chip *gc = irq_desc_get_handler_data(desc); - struct gemini_gpio *g = gpiochip_get_data(gc); - struct irq_chip *irqchip = irq_desc_get_chip(desc); - int offset; - unsigned long stat; - - chained_irq_enter(irqchip, desc); - - stat = readl(g->base + GPIO_INT_STAT); - if (stat) - for_each_set_bit(offset, &stat, gc->ngpio) - generic_handle_irq(irq_find_mapping(gc->irqdomain, - offset)); - - chained_irq_exit(irqchip, desc); -} - -static int gemini_gpio_probe(struct platform_device *pdev) -{ - struct device *dev = &pdev->dev; - struct resource *res; - struct gemini_gpio *g; - int irq; - int ret; - - g = devm_kzalloc(dev, sizeof(*g), GFP_KERNEL); - if (!g) - return -ENOMEM; - - g->dev = dev; - - res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - g->base = devm_ioremap_resource(dev, res); - if (IS_ERR(g->base)) - return PTR_ERR(g->base); - - irq = platform_get_irq(pdev, 0); - if (!irq) - return -EINVAL; - - ret = bgpio_init(&g->gc, dev, 4, - g->base + GPIO_DATA_IN, - g->base + GPIO_DATA_SET, - g->base + GPIO_DATA_CLR, - g->base + GPIO_DIR, - NULL, - 0); - if (ret) { - dev_err(dev, "unable to init generic GPIO\n"); - return ret; - } - g->gc.label = "Gemini"; - g->gc.base = -1; - g->gc.parent = dev; - g->gc.owner = THIS_MODULE; - /* ngpio is set by bgpio_init() */ - - ret = devm_gpiochip_add_data(dev, &g->gc, g); - if (ret) - return ret; - - /* Disable, unmask and clear all interrupts */ - writel(0x0, g->base + GPIO_INT_EN); - writel(0x0, g->base + GPIO_INT_MASK); - writel(~0x0, g->base + GPIO_INT_CLR); - - ret = gpiochip_irqchip_add(&g->gc, &gemini_gpio_irqchip, - 0, handle_bad_irq, - IRQ_TYPE_NONE); - if (ret) { - dev_info(dev, "could not add irqchip\n"); - return ret; - } - gpiochip_set_chained_irqchip(&g->gc, &gemini_gpio_irqchip, - irq, gemini_gpio_irq_handler); - - dev_info(dev, "Gemini GPIO @%p registered\n", g->base); - - return 0; -} - -static const struct of_device_id gemini_gpio_of_match[] = { - { - .compatible = "cortina,gemini-gpio", - }, - {}, -}; - -static struct platform_driver gemini_gpio_driver = { - .driver = { - .name = "gemini-gpio", - .of_match_table = of_match_ptr(gemini_gpio_of_match), - }, - .probe = gemini_gpio_probe, -}; -builtin_platform_driver(gemini_gpio_driver); |