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https://github.com/AsahiLinux/u-boot
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41575d8e4c
This construct is quite long-winded. In earlier days it made some sense since auto-allocation was a strange concept. But with driver model now used pretty universally, we can shorten this to 'auto'. This reduces verbosity and makes it easier to read. Coincidentally it also ensures that every declaration is on one line, thus making dtoc's job easier. Signed-off-by: Simon Glass <sjg@chromium.org>
119 lines
2.8 KiB
C
119 lines
2.8 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2017 Álvaro Fernández Rojas <noltari@gmail.com>
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*
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* Derived from linux/arch/mips/bcm63xx/gpio.c:
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* Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr>
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* Copyright (C) 2008-2011 Florian Fainelli <florian@openwrt.org>
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*/
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#include <common.h>
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#include <dm.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 <linux/bitops.h>
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struct bcm6345_gpio_priv {
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void __iomem *reg_dirout;
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void __iomem *reg_data;
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};
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static int bcm6345_gpio_get_value(struct udevice *dev, unsigned offset)
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{
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struct bcm6345_gpio_priv *priv = dev_get_priv(dev);
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return !!(readl(priv->reg_data) & BIT(offset));
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}
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static int bcm6345_gpio_set_value(struct udevice *dev, unsigned offset,
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int value)
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{
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struct bcm6345_gpio_priv *priv = dev_get_priv(dev);
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if (value)
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setbits_32(priv->reg_data, BIT(offset));
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else
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clrbits_32(priv->reg_data, BIT(offset));
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return 0;
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}
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static int bcm6345_gpio_set_direction(void __iomem *dirout, unsigned offset,
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bool input)
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{
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if (input)
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clrbits_32(dirout, BIT(offset));
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else
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setbits_32(dirout, BIT(offset));
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return 0;
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}
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static int bcm6345_gpio_direction_input(struct udevice *dev, unsigned offset)
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{
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struct bcm6345_gpio_priv *priv = dev_get_priv(dev);
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return bcm6345_gpio_set_direction(priv->reg_dirout, offset, 1);
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}
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static int bcm6345_gpio_direction_output(struct udevice *dev, unsigned offset,
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int value)
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{
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struct bcm6345_gpio_priv *priv = dev_get_priv(dev);
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bcm6345_gpio_set_value(dev, offset, value);
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return bcm6345_gpio_set_direction(priv->reg_dirout, offset, 0);
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}
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static int bcm6345_gpio_get_function(struct udevice *dev, unsigned offset)
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{
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struct bcm6345_gpio_priv *priv = dev_get_priv(dev);
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if (readl(priv->reg_dirout) & BIT(offset))
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return GPIOF_OUTPUT;
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else
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return GPIOF_INPUT;
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}
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static const struct dm_gpio_ops bcm6345_gpio_ops = {
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.direction_input = bcm6345_gpio_direction_input,
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.direction_output = bcm6345_gpio_direction_output,
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.get_value = bcm6345_gpio_get_value,
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.set_value = bcm6345_gpio_set_value,
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.get_function = bcm6345_gpio_get_function,
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};
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static int bcm6345_gpio_probe(struct udevice *dev)
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{
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struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
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struct bcm6345_gpio_priv *priv = dev_get_priv(dev);
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priv->reg_dirout = dev_remap_addr_index(dev, 0);
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if (!priv->reg_dirout)
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return -EINVAL;
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priv->reg_data = dev_remap_addr_index(dev, 1);
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if (!priv->reg_data)
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return -EINVAL;
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uc_priv->gpio_count = dev_read_u32_default(dev, "ngpios", 32);
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uc_priv->bank_name = dev->name;
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return 0;
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}
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static const struct udevice_id bcm6345_gpio_ids[] = {
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{ .compatible = "brcm,bcm6345-gpio" },
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{ /* sentinel */ }
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};
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U_BOOT_DRIVER(bcm6345_gpio) = {
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.name = "bcm6345-gpio",
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.id = UCLASS_GPIO,
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.of_match = bcm6345_gpio_ids,
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.ops = &bcm6345_gpio_ops,
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.priv_auto = sizeof(struct bcm6345_gpio_priv),
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.probe = bcm6345_gpio_probe,
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};
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