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https://github.com/AsahiLinux/u-boot
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83d290c56f
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
142 lines
3.6 KiB
C
142 lines
3.6 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2012 Vikram Narayananan
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* <vikram186@gmail.com>
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*/
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#include <common.h>
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#include <dm.h>
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#include <dm/pinctrl.h>
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#include <errno.h>
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#include <asm/gpio.h>
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#include <asm/io.h>
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#include <fdtdec.h>
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struct bcm2835_gpios {
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struct bcm2835_gpio_regs *reg;
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struct udevice *pinctrl;
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};
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static int bcm2835_gpio_direction_input(struct udevice *dev, unsigned gpio)
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{
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struct bcm2835_gpios *gpios = dev_get_priv(dev);
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unsigned val;
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val = readl(&gpios->reg->gpfsel[BCM2835_GPIO_FSEL_BANK(gpio)]);
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val &= ~(BCM2835_GPIO_FSEL_MASK << BCM2835_GPIO_FSEL_SHIFT(gpio));
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val |= (BCM2835_GPIO_INPUT << BCM2835_GPIO_FSEL_SHIFT(gpio));
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writel(val, &gpios->reg->gpfsel[BCM2835_GPIO_FSEL_BANK(gpio)]);
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return 0;
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}
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static int bcm2835_gpio_direction_output(struct udevice *dev, unsigned int gpio,
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int value)
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{
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struct bcm2835_gpios *gpios = dev_get_priv(dev);
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unsigned val;
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gpio_set_value(gpio, value);
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val = readl(&gpios->reg->gpfsel[BCM2835_GPIO_FSEL_BANK(gpio)]);
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val &= ~(BCM2835_GPIO_FSEL_MASK << BCM2835_GPIO_FSEL_SHIFT(gpio));
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val |= (BCM2835_GPIO_OUTPUT << BCM2835_GPIO_FSEL_SHIFT(gpio));
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writel(val, &gpios->reg->gpfsel[BCM2835_GPIO_FSEL_BANK(gpio)]);
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return 0;
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}
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static int bcm2835_get_value(const struct bcm2835_gpios *gpios, unsigned gpio)
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{
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unsigned val;
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val = readl(&gpios->reg->gplev[BCM2835_GPIO_COMMON_BANK(gpio)]);
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return (val >> BCM2835_GPIO_COMMON_SHIFT(gpio)) & 0x1;
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}
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static int bcm2835_gpio_get_value(struct udevice *dev, unsigned gpio)
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{
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const struct bcm2835_gpios *gpios = dev_get_priv(dev);
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return bcm2835_get_value(gpios, gpio);
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}
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static int bcm2835_gpio_set_value(struct udevice *dev, unsigned gpio,
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int value)
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{
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struct bcm2835_gpios *gpios = dev_get_priv(dev);
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u32 *output_reg = value ? gpios->reg->gpset : gpios->reg->gpclr;
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writel(1 << BCM2835_GPIO_COMMON_SHIFT(gpio),
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&output_reg[BCM2835_GPIO_COMMON_BANK(gpio)]);
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return 0;
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}
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static int bcm2835_gpio_get_function(struct udevice *dev, unsigned offset)
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{
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struct bcm2835_gpios *priv = dev_get_priv(dev);
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int funcid;
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funcid = pinctrl_get_gpio_mux(priv->pinctrl, 0, offset);
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switch (funcid) {
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case BCM2835_GPIO_OUTPUT:
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return GPIOF_OUTPUT;
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case BCM2835_GPIO_INPUT:
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return GPIOF_INPUT;
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default:
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return GPIOF_FUNC;
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}
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}
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static const struct dm_gpio_ops gpio_bcm2835_ops = {
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.direction_input = bcm2835_gpio_direction_input,
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.direction_output = bcm2835_gpio_direction_output,
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.get_value = bcm2835_gpio_get_value,
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.set_value = bcm2835_gpio_set_value,
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.get_function = bcm2835_gpio_get_function,
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};
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static int bcm2835_gpio_probe(struct udevice *dev)
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{
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struct bcm2835_gpios *gpios = dev_get_priv(dev);
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struct bcm2835_gpio_platdata *plat = dev_get_platdata(dev);
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struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
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uc_priv->bank_name = "GPIO";
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uc_priv->gpio_count = BCM2835_GPIO_COUNT;
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gpios->reg = (struct bcm2835_gpio_regs *)plat->base;
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/* We know we're spawned by the pinctrl driver */
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gpios->pinctrl = dev->parent;
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return 0;
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}
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#if CONFIG_IS_ENABLED(OF_CONTROL)
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static int bcm2835_gpio_ofdata_to_platdata(struct udevice *dev)
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{
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struct bcm2835_gpio_platdata *plat = dev_get_platdata(dev);
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fdt_addr_t addr;
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addr = devfdt_get_addr(dev);
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if (addr == FDT_ADDR_T_NONE)
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return -EINVAL;
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plat->base = addr;
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return 0;
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}
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#endif
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U_BOOT_DRIVER(gpio_bcm2835) = {
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.name = "gpio_bcm2835",
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.id = UCLASS_GPIO,
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.ofdata_to_platdata = of_match_ptr(bcm2835_gpio_ofdata_to_platdata),
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.platdata_auto_alloc_size = sizeof(struct bcm2835_gpio_platdata),
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.ops = &gpio_bcm2835_ops,
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.probe = bcm2835_gpio_probe,
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.flags = DM_FLAG_PRE_RELOC,
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.priv_auto_alloc_size = sizeof(struct bcm2835_gpios),
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};
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