1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (C) 2020 Cortina-Access
5 * GPIO Driver for Cortina Access CAxxxx Line of SoCs
13 #include <linux/bitops.h>
14 #include <linux/compat.h>
15 #include <linux/compiler.h>
17 /* GPIO Register Map */
18 #define CORTINA_GPIO_CFG 0x00
19 #define CORTINA_GPIO_OUT 0x04
20 #define CORTINA_GPIO_IN 0x08
21 #define CORTINA_GPIO_LVL 0x0C
22 #define CORTINA_GPIO_EDGE 0x10
23 #define CORTINA_GPIO_BOTHEDGE 0x14
24 #define CORTINA_GPIO_IE 0x18
25 #define CORTINA_GPIO_INT 0x1C
26 #define CORTINA_GPIO_STAT 0x20
28 struct cortina_gpio_bank {
33 static int ca_gpio_direction_input(struct udevice *dev, unsigned int offset)
35 struct cortina_gpio_bank *priv = dev_get_priv(dev);
37 setbits_32(priv->base, BIT(offset));
42 ca_gpio_direction_output(struct udevice *dev, unsigned int offset, int value)
44 struct cortina_gpio_bank *priv = dev_get_priv(dev);
46 clrbits_32(priv->base, BIT(offset));
50 static int ca_gpio_get_value(struct udevice *dev, unsigned int offset)
52 struct cortina_gpio_bank *priv = dev_get_priv(dev);
54 return readl(priv->base + CORTINA_GPIO_IN) & BIT(offset);
57 static int ca_gpio_set_value(struct udevice *dev, unsigned int offset,
60 struct cortina_gpio_bank *priv = dev_get_priv(dev);
62 setbits_32(priv->base + CORTINA_GPIO_OUT, BIT(offset));
66 static int ca_gpio_get_function(struct udevice *dev, unsigned int offset)
68 struct cortina_gpio_bank *priv = dev_get_priv(dev);
70 if (readl(priv->base) & BIT(offset))
76 static const struct dm_gpio_ops gpio_cortina_ops = {
77 .direction_input = ca_gpio_direction_input,
78 .direction_output = ca_gpio_direction_output,
79 .get_value = ca_gpio_get_value,
80 .set_value = ca_gpio_set_value,
81 .get_function = ca_gpio_get_function,
84 static int ca_gpio_probe(struct udevice *dev)
86 struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
87 struct cortina_gpio_bank *priv = dev_get_priv(dev);
89 priv->base = dev_remap_addr_index(dev, 0);
93 uc_priv->gpio_count = dev_read_u32_default(dev, "ngpios", 32);
94 uc_priv->bank_name = dev->name;
96 debug("Done Cortina GPIO init\n");
100 static const struct udevice_id ca_gpio_ids[] = {
101 {.compatible = "cortina,ca-gpio"},
105 U_BOOT_DRIVER(cortina_gpio) = {
106 .name = "cortina-gpio",
108 .ops = &gpio_cortina_ops,
109 .probe = ca_gpio_probe,
110 .priv_auto_alloc_size = sizeof(struct cortina_gpio_bank),
111 .of_match = ca_gpio_ids,
113 #endif /* CONFIG_DM_GPIO */