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Stefan Roese2cb06a42012-02-14 14:01:36 +01001/*
2 * Copyright (C) 2012 Stefan Roese <sr@denx.de>
3 *
Wolfgang Denk1a459662013-07-08 09:37:19 +02004 * SPDX-License-Identifier: GPL-2.0+
Stefan Roese2cb06a42012-02-14 14:01:36 +01005 */
6
7/*
8 * Driver for SPEAr600 GPIO controller
9 */
10
11#include <common.h>
12#include <asm/arch/hardware.h>
13#include <asm/gpio.h>
14#include <asm/io.h>
15#include <errno.h>
16
17static int gpio_direction(unsigned gpio,
18 enum gpio_direction direction)
19{
20 struct gpio_regs *regs = (struct gpio_regs *)CONFIG_GPIO_BASE;
21 u32 val;
22
23 val = readl(&regs->gpiodir);
24
25 if (direction == GPIO_DIRECTION_OUT)
26 val |= 1 << gpio;
27 else
28 val &= ~(1 << gpio);
29
30 writel(val, &regs->gpiodir);
31
32 return 0;
33}
34
35int gpio_set_value(unsigned gpio, int value)
36{
37 struct gpio_regs *regs = (struct gpio_regs *)CONFIG_GPIO_BASE;
38
39 writel(1 << gpio, &regs->gpiodata[DATA_REG_ADDR(gpio)]);
40
41 return 0;
42}
43
44int gpio_get_value(unsigned gpio)
45{
46 struct gpio_regs *regs = (struct gpio_regs *)CONFIG_GPIO_BASE;
47 u32 val;
48
49 val = readl(&regs->gpiodata[DATA_REG_ADDR(gpio)]);
50
51 return !!val;
52}
53
54int gpio_request(unsigned gpio, const char *label)
55{
56 if (gpio >= SPEAR_GPIO_COUNT)
57 return -EINVAL;
58
59 return 0;
60}
61
62int gpio_free(unsigned gpio)
63{
64 return 0;
65}
66
67void gpio_toggle_value(unsigned gpio)
68{
69 gpio_set_value(gpio, !gpio_get_value(gpio));
70}
71
72int gpio_direction_input(unsigned gpio)
73{
74 return gpio_direction(gpio, GPIO_DIRECTION_IN);
75}
76
77int gpio_direction_output(unsigned gpio, int value)
78{
79 int ret = gpio_direction(gpio, GPIO_DIRECTION_OUT);
80
81 if (ret < 0)
82 return ret;
83
84 gpio_set_value(gpio, value);
85 return 0;
86}