/* * Copyright (C) 2012 Vikram Narayananan * <vikram186@gmail.com> * * SPDX-License-Identifier: GPL-2.0+ */ #include <common.h> #include <dm.h> #include <errno.h> #include <asm/gpio.h> #include <asm/io.h> struct bcm2835_gpios { struct bcm2835_gpio_regs *reg; }; static int bcm2835_gpio_direction_input(struct udevice *dev, unsigned gpio) { struct bcm2835_gpios *gpios = dev_get_priv(dev); unsigned val; val = readl(&gpios->reg->gpfsel[BCM2835_GPIO_FSEL_BANK(gpio)]); val &= ~(BCM2835_GPIO_FSEL_MASK << BCM2835_GPIO_FSEL_SHIFT(gpio)); val |= (BCM2835_GPIO_INPUT << BCM2835_GPIO_FSEL_SHIFT(gpio)); writel(val, &gpios->reg->gpfsel[BCM2835_GPIO_FSEL_BANK(gpio)]); return 0; } static int bcm2835_gpio_direction_output(struct udevice *dev, unsigned gpio, int value) { struct bcm2835_gpios *gpios = dev_get_priv(dev); unsigned val; gpio_set_value(gpio, value); val = readl(&gpios->reg->gpfsel[BCM2835_GPIO_FSEL_BANK(gpio)]); val &= ~(BCM2835_GPIO_FSEL_MASK << BCM2835_GPIO_FSEL_SHIFT(gpio)); val |= (BCM2835_GPIO_OUTPUT << BCM2835_GPIO_FSEL_SHIFT(gpio)); writel(val, &gpios->reg->gpfsel[BCM2835_GPIO_FSEL_BANK(gpio)]); return 0; } static bool bcm2835_gpio_is_output(const struct bcm2835_gpios *gpios, int gpio) { u32 val; val = readl(&gpios->reg->gpfsel[BCM2835_GPIO_FSEL_BANK(gpio)]); val &= BCM2835_GPIO_FSEL_MASK << BCM2835_GPIO_FSEL_SHIFT(gpio); return val ? true : false; } static int bcm2835_get_value(const struct bcm2835_gpios *gpios, unsigned gpio) { unsigned val; val = readl(&gpios->reg->gplev[BCM2835_GPIO_COMMON_BANK(gpio)]); return (val >> BCM2835_GPIO_COMMON_SHIFT(gpio)) & 0x1; } static int bcm2835_gpio_get_value(struct udevice *dev, unsigned gpio) { const struct bcm2835_gpios *gpios = dev_get_priv(dev); return bcm2835_get_value(gpios, gpio); } static int bcm2835_gpio_set_value(struct udevice *dev, unsigned gpio, int value) { struct bcm2835_gpios *gpios = dev_get_priv(dev); u32 *output_reg = value ? gpios->reg->gpset : gpios->reg->gpclr; writel(1 << BCM2835_GPIO_COMMON_SHIFT(gpio), &output_reg[BCM2835_GPIO_COMMON_BANK(gpio)]); return 0; } static int bcm2835_gpio_get_function(struct udevice *dev, unsigned offset) { struct bcm2835_gpios *gpios = dev_get_priv(dev); /* GPIOF_FUNC is not implemented yet */ if (bcm2835_gpio_is_output(gpios, offset)) return GPIOF_OUTPUT; else return GPIOF_INPUT; } static const struct dm_gpio_ops gpio_bcm2835_ops = { .direction_input = bcm2835_gpio_direction_input, .direction_output = bcm2835_gpio_direction_output, .get_value = bcm2835_gpio_get_value, .set_value = bcm2835_gpio_set_value, .get_function = bcm2835_gpio_get_function, }; static int bcm2835_gpio_probe(struct udevice *dev) { struct bcm2835_gpios *gpios = dev_get_priv(dev); struct bcm2835_gpio_platdata *plat = dev_get_platdata(dev); struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev); uc_priv->bank_name = "GPIO"; uc_priv->gpio_count = BCM2835_GPIO_COUNT; gpios->reg = (struct bcm2835_gpio_regs *)plat->base; return 0; } U_BOOT_DRIVER(gpio_bcm2835) = { .name = "gpio_bcm2835", .id = UCLASS_GPIO, .ops = &gpio_bcm2835_ops, .probe = bcm2835_gpio_probe, .priv_auto_alloc_size = sizeof(struct bcm2835_gpios), };