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2cb06a4f SR |
1 | /* |
2 | * Copyright (C) 2012 Stefan Roese <sr@denx.de> | |
3 | * | |
1a459660 | 4 | * SPDX-License-Identifier: GPL-2.0+ |
2cb06a4f SR |
5 | */ |
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 | ||
17 | static 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(®s->gpiodir); | |
24 | ||
25 | if (direction == GPIO_DIRECTION_OUT) | |
26 | val |= 1 << gpio; | |
27 | else | |
28 | val &= ~(1 << gpio); | |
29 | ||
30 | writel(val, ®s->gpiodir); | |
31 | ||
32 | return 0; | |
33 | } | |
34 | ||
35 | int gpio_set_value(unsigned gpio, int value) | |
36 | { | |
37 | struct gpio_regs *regs = (struct gpio_regs *)CONFIG_GPIO_BASE; | |
38 | ||
c0c37402 AL |
39 | if (value) |
40 | writel(1 << gpio, ®s->gpiodata[DATA_REG_ADDR(gpio)]); | |
41 | else | |
42 | writel(0, ®s->gpiodata[DATA_REG_ADDR(gpio)]); | |
2cb06a4f SR |
43 | |
44 | return 0; | |
45 | } | |
46 | ||
47 | int gpio_get_value(unsigned gpio) | |
48 | { | |
49 | struct gpio_regs *regs = (struct gpio_regs *)CONFIG_GPIO_BASE; | |
50 | u32 val; | |
51 | ||
52 | val = readl(®s->gpiodata[DATA_REG_ADDR(gpio)]); | |
53 | ||
54 | return !!val; | |
55 | } | |
56 | ||
57 | int gpio_request(unsigned gpio, const char *label) | |
58 | { | |
59 | if (gpio >= SPEAR_GPIO_COUNT) | |
60 | return -EINVAL; | |
61 | ||
62 | return 0; | |
63 | } | |
64 | ||
65 | int gpio_free(unsigned gpio) | |
66 | { | |
67 | return 0; | |
68 | } | |
69 | ||
70 | void gpio_toggle_value(unsigned gpio) | |
71 | { | |
72 | gpio_set_value(gpio, !gpio_get_value(gpio)); | |
73 | } | |
74 | ||
75 | int gpio_direction_input(unsigned gpio) | |
76 | { | |
77 | return gpio_direction(gpio, GPIO_DIRECTION_IN); | |
78 | } | |
79 | ||
80 | int gpio_direction_output(unsigned gpio, int value) | |
81 | { | |
82 | int ret = gpio_direction(gpio, GPIO_DIRECTION_OUT); | |
83 | ||
84 | if (ret < 0) | |
85 | return ret; | |
86 | ||
87 | gpio_set_value(gpio, value); | |
88 | return 0; | |
89 | } |