2 * Copyright (C) 2012 Vikram Narayananan
3 * <vikram186@gmail.com>
5 * SPDX-License-Identifier: GPL-2.0+
14 struct bcm2835_gpios {
15 struct bcm2835_gpio_regs *reg;
18 static int bcm2835_gpio_direction_input(struct udevice *dev, unsigned gpio)
20 struct bcm2835_gpios *gpios = dev_get_priv(dev);
23 val = readl(&gpios->reg->gpfsel[BCM2835_GPIO_FSEL_BANK(gpio)]);
24 val &= ~(BCM2835_GPIO_FSEL_MASK << BCM2835_GPIO_FSEL_SHIFT(gpio));
25 val |= (BCM2835_GPIO_INPUT << BCM2835_GPIO_FSEL_SHIFT(gpio));
26 writel(val, &gpios->reg->gpfsel[BCM2835_GPIO_FSEL_BANK(gpio)]);
31 static int bcm2835_gpio_direction_output(struct udevice *dev, unsigned gpio,
34 struct bcm2835_gpios *gpios = dev_get_priv(dev);
37 gpio_set_value(gpio, value);
39 val = readl(&gpios->reg->gpfsel[BCM2835_GPIO_FSEL_BANK(gpio)]);
40 val &= ~(BCM2835_GPIO_FSEL_MASK << BCM2835_GPIO_FSEL_SHIFT(gpio));
41 val |= (BCM2835_GPIO_OUTPUT << BCM2835_GPIO_FSEL_SHIFT(gpio));
42 writel(val, &gpios->reg->gpfsel[BCM2835_GPIO_FSEL_BANK(gpio)]);
47 static bool bcm2835_gpio_is_output(const struct bcm2835_gpios *gpios, int gpio)
51 val = readl(&gpios->reg->gpfsel[BCM2835_GPIO_FSEL_BANK(gpio)]);
52 val &= BCM2835_GPIO_FSEL_MASK << BCM2835_GPIO_FSEL_SHIFT(gpio);
53 return val ? true : false;
56 static int bcm2835_get_value(const struct bcm2835_gpios *gpios, unsigned gpio)
60 val = readl(&gpios->reg->gplev[BCM2835_GPIO_COMMON_BANK(gpio)]);
62 return (val >> BCM2835_GPIO_COMMON_SHIFT(gpio)) & 0x1;
65 static int bcm2835_gpio_get_value(struct udevice *dev, unsigned gpio)
67 const struct bcm2835_gpios *gpios = dev_get_priv(dev);
69 return bcm2835_get_value(gpios, gpio);
72 static int bcm2835_gpio_set_value(struct udevice *dev, unsigned gpio,
75 struct bcm2835_gpios *gpios = dev_get_priv(dev);
76 u32 *output_reg = value ? gpios->reg->gpset : gpios->reg->gpclr;
78 writel(1 << BCM2835_GPIO_COMMON_SHIFT(gpio),
79 &output_reg[BCM2835_GPIO_COMMON_BANK(gpio)]);
84 static int bcm2835_gpio_get_function(struct udevice *dev, unsigned offset)
86 struct bcm2835_gpios *gpios = dev_get_priv(dev);
88 /* GPIOF_FUNC is not implemented yet */
89 if (bcm2835_gpio_is_output(gpios, offset))
96 static const struct dm_gpio_ops gpio_bcm2835_ops = {
97 .direction_input = bcm2835_gpio_direction_input,
98 .direction_output = bcm2835_gpio_direction_output,
99 .get_value = bcm2835_gpio_get_value,
100 .set_value = bcm2835_gpio_set_value,
101 .get_function = bcm2835_gpio_get_function,
104 static int bcm2835_gpio_probe(struct udevice *dev)
106 struct bcm2835_gpios *gpios = dev_get_priv(dev);
107 struct bcm2835_gpio_platdata *plat = dev_get_platdata(dev);
108 struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
110 uc_priv->bank_name = "GPIO";
111 uc_priv->gpio_count = BCM2835_GPIO_COUNT;
112 gpios->reg = (struct bcm2835_gpio_regs *)plat->base;
117 U_BOOT_DRIVER(gpio_bcm2835) = {
118 .name = "gpio_bcm2835",
120 .ops = &gpio_bcm2835_ops,
121 .probe = bcm2835_gpio_probe,
122 .priv_auto_alloc_size = sizeof(struct bcm2835_gpios),