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Commit | Line | Data |
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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 | ||
39 | writel(1 << gpio, ®s->gpiodata[DATA_REG_ADDR(gpio)]); | |
40 | ||
41 | return 0; | |
42 | } | |
43 | ||
44 | int gpio_get_value(unsigned gpio) | |
45 | { | |
46 | struct gpio_regs *regs = (struct gpio_regs *)CONFIG_GPIO_BASE; | |
47 | u32 val; | |
48 | ||
49 | val = readl(®s->gpiodata[DATA_REG_ADDR(gpio)]); | |
50 | ||
51 | return !!val; | |
52 | } | |
53 | ||
54 | int gpio_request(unsigned gpio, const char *label) | |
55 | { | |
56 | if (gpio >= SPEAR_GPIO_COUNT) | |
57 | return -EINVAL; | |
58 | ||
59 | return 0; | |
60 | } | |
61 | ||
62 | int gpio_free(unsigned gpio) | |
63 | { | |
64 | return 0; | |
65 | } | |
66 | ||
67 | void gpio_toggle_value(unsigned gpio) | |
68 | { | |
69 | gpio_set_value(gpio, !gpio_get_value(gpio)); | |
70 | } | |
71 | ||
72 | int gpio_direction_input(unsigned gpio) | |
73 | { | |
74 | return gpio_direction(gpio, GPIO_DIRECTION_IN); | |
75 | } | |
76 | ||
77 | int 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 | } |