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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>
113 lines
2.6 KiB
C
113 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2020 Cortina-Access
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*
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* GPIO Driver for Cortina Access CAxxxx Line of SoCs
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*/
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#include <common.h>
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#include <dm.h>
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#include <log.h>
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#include <asm/io.h>
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#include <asm/gpio.h>
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#include <linux/bitops.h>
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#include <linux/compat.h>
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#include <linux/compiler.h>
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/* GPIO Register Map */
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#define CORTINA_GPIO_CFG 0x00
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#define CORTINA_GPIO_OUT 0x04
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#define CORTINA_GPIO_IN 0x08
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#define CORTINA_GPIO_LVL 0x0C
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#define CORTINA_GPIO_EDGE 0x10
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#define CORTINA_GPIO_BOTHEDGE 0x14
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#define CORTINA_GPIO_IE 0x18
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#define CORTINA_GPIO_INT 0x1C
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#define CORTINA_GPIO_STAT 0x20
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struct cortina_gpio_bank {
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void __iomem *base;
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};
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#ifdef CONFIG_DM_GPIO
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static int ca_gpio_direction_input(struct udevice *dev, unsigned int offset)
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{
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struct cortina_gpio_bank *priv = dev_get_priv(dev);
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setbits_32(priv->base, BIT(offset));
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return 0;
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}
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static int
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ca_gpio_direction_output(struct udevice *dev, unsigned int offset, int value)
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{
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struct cortina_gpio_bank *priv = dev_get_priv(dev);
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clrbits_32(priv->base, BIT(offset));
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return 0;
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}
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static int ca_gpio_get_value(struct udevice *dev, unsigned int offset)
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{
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struct cortina_gpio_bank *priv = dev_get_priv(dev);
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return readl(priv->base + CORTINA_GPIO_IN) & BIT(offset);
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}
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static int ca_gpio_set_value(struct udevice *dev, unsigned int offset,
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int value)
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{
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struct cortina_gpio_bank *priv = dev_get_priv(dev);
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setbits_32(priv->base + CORTINA_GPIO_OUT, BIT(offset));
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return 0;
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}
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static int ca_gpio_get_function(struct udevice *dev, unsigned int offset)
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{
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struct cortina_gpio_bank *priv = dev_get_priv(dev);
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if (readl(priv->base) & BIT(offset))
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return GPIOF_INPUT;
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else
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return GPIOF_OUTPUT;
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}
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static const struct dm_gpio_ops gpio_cortina_ops = {
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.direction_input = ca_gpio_direction_input,
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.direction_output = ca_gpio_direction_output,
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.get_value = ca_gpio_get_value,
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.set_value = ca_gpio_set_value,
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.get_function = ca_gpio_get_function,
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};
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static int ca_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 cortina_gpio_bank *priv = dev_get_priv(dev);
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priv->base = dev_remap_addr_index(dev, 0);
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if (!priv->base)
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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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debug("Done Cortina GPIO init\n");
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return 0;
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}
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static const struct udevice_id ca_gpio_ids[] = {
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{.compatible = "cortina,ca-gpio"},
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{}
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};
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U_BOOT_DRIVER(cortina_gpio) = {
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.name = "cortina-gpio",
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.id = UCLASS_GPIO,
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.ops = &gpio_cortina_ops,
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.probe = ca_gpio_probe,
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.priv_auto = sizeof(struct cortina_gpio_bank),
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.of_match = ca_gpio_ids,
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};
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#endif /* CONFIG_DM_GPIO */
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