1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Copyright (C) 2015 Linaro
4 * Peter Griffin <peter.griffin@linaro.org>
5 */
6
7#include <dm.h>
8#include <asm/gpio.h>
9#include <asm/io.h>
10#include <errno.h>
11#include <linux/bitops.h>
12
13static int hi6220_gpio_direction_input(struct udevice *dev, unsigned int gpio)
14{
15	struct gpio_bank *bank = dev_get_priv(dev);
16	u8 data;
17
18	data = readb(bank->base + HI6220_GPIO_DIR);
19	data &= ~(1 << gpio);
20	writeb(data, bank->base + HI6220_GPIO_DIR);
21
22	return 0;
23}
24
25static int hi6220_gpio_set_value(struct udevice *dev, unsigned gpio,
26				  int value)
27{
28	struct gpio_bank *bank = dev_get_priv(dev);
29
30	writeb(!!value << gpio, bank->base + (BIT(gpio + 2)));
31	return 0;
32}
33
34static int hi6220_gpio_direction_output(struct udevice *dev, unsigned gpio,
35					int value)
36{
37	struct gpio_bank *bank = dev_get_priv(dev);
38	u8 data;
39
40	data = readb(bank->base + HI6220_GPIO_DIR);
41	data |= 1 << gpio;
42	writeb(data, bank->base + HI6220_GPIO_DIR);
43
44	hi6220_gpio_set_value(dev, gpio, value);
45
46	return 0;
47}
48
49static int hi6220_gpio_get_value(struct udevice *dev, unsigned gpio)
50{
51	struct gpio_bank *bank = dev_get_priv(dev);
52
53	return !!readb(bank->base + (BIT(gpio + 2)));
54}
55
56static const struct dm_gpio_ops gpio_hi6220_ops = {
57	.direction_input	= hi6220_gpio_direction_input,
58	.direction_output	= hi6220_gpio_direction_output,
59	.get_value		= hi6220_gpio_get_value,
60	.set_value		= hi6220_gpio_set_value,
61};
62
63static int hi6220_gpio_probe(struct udevice *dev)
64{
65	struct gpio_bank *bank = dev_get_priv(dev);
66	struct hikey_gpio_plat *plat = dev_get_plat(dev);
67	struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
68	char name[18], *str;
69
70	sprintf(name, "GPIO%d_", plat->bank_index);
71
72	str = strdup(name);
73	if (!str)
74		return -ENOMEM;
75
76	uc_priv->bank_name = str;
77	uc_priv->gpio_count = HI6220_GPIO_PER_BANK;
78
79	bank->base = (u8 *)plat->base;
80
81	return 0;
82}
83
84U_BOOT_DRIVER(gpio_hi6220) = {
85	.name	= "gpio_hi6220",
86	.id	= UCLASS_GPIO,
87	.ops	= &gpio_hi6220_ops,
88	.probe	= hi6220_gpio_probe,
89	.priv_auto	= sizeof(struct gpio_bank),
90};
91