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 <asm/arch/hardware.h>
12 #include <asm/gpio.h>
13 #include <asm/io.h>
14 #include <errno.h>
15
gpio_direction(unsigned gpio,enum gpio_direction direction)16 static int gpio_direction(unsigned gpio,
17 enum gpio_direction direction)
18 {
19 struct gpio_regs *regs = (struct gpio_regs *)CONFIG_GPIO_BASE;
20 u32 val;
21
22 val = readl(®s->gpiodir);
23
24 if (direction == GPIO_DIRECTION_OUT)
25 val |= 1 << gpio;
26 else
27 val &= ~(1 << gpio);
28
29 writel(val, ®s->gpiodir);
30
31 return 0;
32 }
33
gpio_set_value(unsigned gpio,int value)34 int gpio_set_value(unsigned gpio, int value)
35 {
36 struct gpio_regs *regs = (struct gpio_regs *)CONFIG_GPIO_BASE;
37
38 if (value)
39 writel(1 << gpio, ®s->gpiodata[DATA_REG_ADDR(gpio)]);
40 else
41 writel(0, ®s->gpiodata[DATA_REG_ADDR(gpio)]);
42
43 return 0;
44 }
45
gpio_get_value(unsigned gpio)46 int gpio_get_value(unsigned gpio)
47 {
48 struct gpio_regs *regs = (struct gpio_regs *)CONFIG_GPIO_BASE;
49 u32 val;
50
51 val = readl(®s->gpiodata[DATA_REG_ADDR(gpio)]);
52
53 return !!val;
54 }
55
gpio_request(unsigned gpio,const char * label)56 int gpio_request(unsigned gpio, const char *label)
57 {
58 if (gpio >= SPEAR_GPIO_COUNT)
59 return -EINVAL;
60
61 return 0;
62 }
63
gpio_free(unsigned gpio)64 int gpio_free(unsigned gpio)
65 {
66 return 0;
67 }
68
gpio_toggle_value(unsigned gpio)69 void gpio_toggle_value(unsigned gpio)
70 {
71 gpio_set_value(gpio, !gpio_get_value(gpio));
72 }
73
gpio_direction_input(unsigned gpio)74 int gpio_direction_input(unsigned gpio)
75 {
76 return gpio_direction(gpio, GPIO_DIRECTION_IN);
77 }
78
gpio_direction_output(unsigned gpio,int value)79 int gpio_direction_output(unsigned gpio, int value)
80 {
81 int ret = gpio_direction(gpio, GPIO_DIRECTION_OUT);
82
83 if (ret < 0)
84 return ret;
85
86 gpio_set_value(gpio, value);
87 return 0;
88 }
89