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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * Copyright (C) 2020 Cortina-Access
- *
- * GPIO Driver for Cortina Access CAxxxx Line of SoCs
- */
- #include <common.h>
- #include <dm.h>
- #include <log.h>
- #include <asm/io.h>
- #include <asm/gpio.h>
- #include <linux/bitops.h>
- #include <linux/compat.h>
- #include <linux/compiler.h>
- /* GPIO Register Map */
- #define CORTINA_GPIO_CFG 0x00
- #define CORTINA_GPIO_OUT 0x04
- #define CORTINA_GPIO_IN 0x08
- #define CORTINA_GPIO_LVL 0x0C
- #define CORTINA_GPIO_EDGE 0x10
- #define CORTINA_GPIO_BOTHEDGE 0x14
- #define CORTINA_GPIO_IE 0x18
- #define CORTINA_GPIO_INT 0x1C
- #define CORTINA_GPIO_STAT 0x20
- struct cortina_gpio_bank {
- void __iomem *base;
- };
- #ifdef CONFIG_DM_GPIO
- static int ca_gpio_direction_input(struct udevice *dev, unsigned int offset)
- {
- struct cortina_gpio_bank *priv = dev_get_priv(dev);
- setbits_32(priv->base, BIT(offset));
- return 0;
- }
- static int
- ca_gpio_direction_output(struct udevice *dev, unsigned int offset, int value)
- {
- struct cortina_gpio_bank *priv = dev_get_priv(dev);
- clrbits_32(priv->base, BIT(offset));
- return 0;
- }
- static int ca_gpio_get_value(struct udevice *dev, unsigned int offset)
- {
- struct cortina_gpio_bank *priv = dev_get_priv(dev);
- return readl(priv->base + CORTINA_GPIO_IN) & BIT(offset);
- }
- static int ca_gpio_set_value(struct udevice *dev, unsigned int offset,
- int value)
- {
- struct cortina_gpio_bank *priv = dev_get_priv(dev);
- setbits_32(priv->base + CORTINA_GPIO_OUT, BIT(offset));
- return 0;
- }
- static int ca_gpio_get_function(struct udevice *dev, unsigned int offset)
- {
- struct cortina_gpio_bank *priv = dev_get_priv(dev);
- if (readl(priv->base) & BIT(offset))
- return GPIOF_INPUT;
- else
- return GPIOF_OUTPUT;
- }
- static const struct dm_gpio_ops gpio_cortina_ops = {
- .direction_input = ca_gpio_direction_input,
- .direction_output = ca_gpio_direction_output,
- .get_value = ca_gpio_get_value,
- .set_value = ca_gpio_set_value,
- .get_function = ca_gpio_get_function,
- };
- static int ca_gpio_probe(struct udevice *dev)
- {
- struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
- struct cortina_gpio_bank *priv = dev_get_priv(dev);
- priv->base = dev_remap_addr_index(dev, 0);
- if (!priv->base)
- return -EINVAL;
- uc_priv->gpio_count = dev_read_u32_default(dev, "ngpios", 32);
- uc_priv->bank_name = dev->name;
- debug("Done Cortina GPIO init\n");
- return 0;
- }
- static const struct udevice_id ca_gpio_ids[] = {
- {.compatible = "cortina,ca-gpio"},
- {}
- };
- U_BOOT_DRIVER(cortina_gpio) = {
- .name = "cortina-gpio",
- .id = UCLASS_GPIO,
- .ops = &gpio_cortina_ops,
- .probe = ca_gpio_probe,
- .priv_auto = sizeof(struct cortina_gpio_bank),
- .of_match = ca_gpio_ids,
- };
- #endif /* CONFIG_DM_GPIO */
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