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2cb06a4f SR |
1 | /* |
2 | * Copyright (C) 2012 Stefan Roese <sr@denx.de> | |
3 | * | |
4 | * See file CREDITS for list of people who contributed to this | |
5 | * project. | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License as | |
9 | * published by the Free Software Foundation; either version 2 of | |
10 | * the License, or (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, | |
20 | * MA 02111-1307 USA | |
21 | */ | |
22 | ||
23 | /* | |
24 | * Driver for SPEAr600 GPIO controller | |
25 | */ | |
26 | ||
27 | #include <common.h> | |
28 | #include <asm/arch/hardware.h> | |
29 | #include <asm/gpio.h> | |
30 | #include <asm/io.h> | |
31 | #include <errno.h> | |
32 | ||
33 | static int gpio_direction(unsigned gpio, | |
34 | enum gpio_direction direction) | |
35 | { | |
36 | struct gpio_regs *regs = (struct gpio_regs *)CONFIG_GPIO_BASE; | |
37 | u32 val; | |
38 | ||
39 | val = readl(®s->gpiodir); | |
40 | ||
41 | if (direction == GPIO_DIRECTION_OUT) | |
42 | val |= 1 << gpio; | |
43 | else | |
44 | val &= ~(1 << gpio); | |
45 | ||
46 | writel(val, ®s->gpiodir); | |
47 | ||
48 | return 0; | |
49 | } | |
50 | ||
51 | int gpio_set_value(unsigned gpio, int value) | |
52 | { | |
53 | struct gpio_regs *regs = (struct gpio_regs *)CONFIG_GPIO_BASE; | |
54 | ||
55 | writel(1 << gpio, ®s->gpiodata[DATA_REG_ADDR(gpio)]); | |
56 | ||
57 | return 0; | |
58 | } | |
59 | ||
60 | int gpio_get_value(unsigned gpio) | |
61 | { | |
62 | struct gpio_regs *regs = (struct gpio_regs *)CONFIG_GPIO_BASE; | |
63 | u32 val; | |
64 | ||
65 | val = readl(®s->gpiodata[DATA_REG_ADDR(gpio)]); | |
66 | ||
67 | return !!val; | |
68 | } | |
69 | ||
70 | int gpio_request(unsigned gpio, const char *label) | |
71 | { | |
72 | if (gpio >= SPEAR_GPIO_COUNT) | |
73 | return -EINVAL; | |
74 | ||
75 | return 0; | |
76 | } | |
77 | ||
78 | int gpio_free(unsigned gpio) | |
79 | { | |
80 | return 0; | |
81 | } | |
82 | ||
83 | void gpio_toggle_value(unsigned gpio) | |
84 | { | |
85 | gpio_set_value(gpio, !gpio_get_value(gpio)); | |
86 | } | |
87 | ||
88 | int gpio_direction_input(unsigned gpio) | |
89 | { | |
90 | return gpio_direction(gpio, GPIO_DIRECTION_IN); | |
91 | } | |
92 | ||
93 | int gpio_direction_output(unsigned gpio, int value) | |
94 | { | |
95 | int ret = gpio_direction(gpio, GPIO_DIRECTION_OUT); | |
96 | ||
97 | if (ret < 0) | |
98 | return ret; | |
99 | ||
100 | gpio_set_value(gpio, value); | |
101 | return 0; | |
102 | } |