1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (C) 2012 Stefan Roese <sr@denx.de>
4 */
5
6 /*
7 * Driver for SPEAr600 GPIO controller
8 */
9
10 #include <common.h>
11 #include <malloc.h>
12 #include <asm/arch/hardware.h>
13 #include <asm/gpio.h>
14 #include <asm/io.h>
15 #include <errno.h>
16
gpio_direction(unsigned gpio,enum gpio_direction direction)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
gpio_set_value(unsigned gpio,int value)35 int gpio_set_value(unsigned gpio, int value)
36 {
37 struct gpio_regs *regs = (struct gpio_regs *)CONFIG_GPIO_BASE;
38
39 if (value)
40 writel(1 << gpio, ®s->gpiodata[DATA_REG_ADDR(gpio)]);
41 else
42 writel(0, ®s->gpiodata[DATA_REG_ADDR(gpio)]);
43
44 return 0;
45 }
46
gpio_get_value(unsigned gpio)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
gpio_request(unsigned gpio,const char * label)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
gpio_free(unsigned gpio)65 int gpio_free(unsigned gpio)
66 {
67 return 0;
68 }
69
gpio_toggle_value(unsigned gpio)70 void gpio_toggle_value(unsigned gpio)
71 {
72 gpio_set_value(gpio, !gpio_get_value(gpio));
73 }
74
gpio_direction_input(unsigned gpio)75 int gpio_direction_input(unsigned gpio)
76 {
77 return gpio_direction(gpio, GPIO_DIRECTION_IN);
78 }
79
gpio_direction_output(unsigned gpio,int value)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 }
90