1*4882a593Smuzhiyun /*
2*4882a593Smuzhiyun * Copyright (C) 2012 Stefan Roese <sr@denx.de>
3*4882a593Smuzhiyun *
4*4882a593Smuzhiyun * SPDX-License-Identifier: GPL-2.0+
5*4882a593Smuzhiyun */
6*4882a593Smuzhiyun
7*4882a593Smuzhiyun /*
8*4882a593Smuzhiyun * Driver for SPEAr600 GPIO controller
9*4882a593Smuzhiyun */
10*4882a593Smuzhiyun
11*4882a593Smuzhiyun #include <common.h>
12*4882a593Smuzhiyun #include <asm/arch/hardware.h>
13*4882a593Smuzhiyun #include <asm/gpio.h>
14*4882a593Smuzhiyun #include <asm/io.h>
15*4882a593Smuzhiyun #include <errno.h>
16*4882a593Smuzhiyun
gpio_direction(unsigned gpio,enum gpio_direction direction)17*4882a593Smuzhiyun static int gpio_direction(unsigned gpio,
18*4882a593Smuzhiyun enum gpio_direction direction)
19*4882a593Smuzhiyun {
20*4882a593Smuzhiyun struct gpio_regs *regs = (struct gpio_regs *)CONFIG_GPIO_BASE;
21*4882a593Smuzhiyun u32 val;
22*4882a593Smuzhiyun
23*4882a593Smuzhiyun val = readl(®s->gpiodir);
24*4882a593Smuzhiyun
25*4882a593Smuzhiyun if (direction == GPIO_DIRECTION_OUT)
26*4882a593Smuzhiyun val |= 1 << gpio;
27*4882a593Smuzhiyun else
28*4882a593Smuzhiyun val &= ~(1 << gpio);
29*4882a593Smuzhiyun
30*4882a593Smuzhiyun writel(val, ®s->gpiodir);
31*4882a593Smuzhiyun
32*4882a593Smuzhiyun return 0;
33*4882a593Smuzhiyun }
34*4882a593Smuzhiyun
gpio_set_value(unsigned gpio,int value)35*4882a593Smuzhiyun int gpio_set_value(unsigned gpio, int value)
36*4882a593Smuzhiyun {
37*4882a593Smuzhiyun struct gpio_regs *regs = (struct gpio_regs *)CONFIG_GPIO_BASE;
38*4882a593Smuzhiyun
39*4882a593Smuzhiyun if (value)
40*4882a593Smuzhiyun writel(1 << gpio, ®s->gpiodata[DATA_REG_ADDR(gpio)]);
41*4882a593Smuzhiyun else
42*4882a593Smuzhiyun writel(0, ®s->gpiodata[DATA_REG_ADDR(gpio)]);
43*4882a593Smuzhiyun
44*4882a593Smuzhiyun return 0;
45*4882a593Smuzhiyun }
46*4882a593Smuzhiyun
gpio_get_value(unsigned gpio)47*4882a593Smuzhiyun int gpio_get_value(unsigned gpio)
48*4882a593Smuzhiyun {
49*4882a593Smuzhiyun struct gpio_regs *regs = (struct gpio_regs *)CONFIG_GPIO_BASE;
50*4882a593Smuzhiyun u32 val;
51*4882a593Smuzhiyun
52*4882a593Smuzhiyun val = readl(®s->gpiodata[DATA_REG_ADDR(gpio)]);
53*4882a593Smuzhiyun
54*4882a593Smuzhiyun return !!val;
55*4882a593Smuzhiyun }
56*4882a593Smuzhiyun
gpio_request(unsigned gpio,const char * label)57*4882a593Smuzhiyun int gpio_request(unsigned gpio, const char *label)
58*4882a593Smuzhiyun {
59*4882a593Smuzhiyun if (gpio >= SPEAR_GPIO_COUNT)
60*4882a593Smuzhiyun return -EINVAL;
61*4882a593Smuzhiyun
62*4882a593Smuzhiyun return 0;
63*4882a593Smuzhiyun }
64*4882a593Smuzhiyun
gpio_free(unsigned gpio)65*4882a593Smuzhiyun int gpio_free(unsigned gpio)
66*4882a593Smuzhiyun {
67*4882a593Smuzhiyun return 0;
68*4882a593Smuzhiyun }
69*4882a593Smuzhiyun
gpio_toggle_value(unsigned gpio)70*4882a593Smuzhiyun void gpio_toggle_value(unsigned gpio)
71*4882a593Smuzhiyun {
72*4882a593Smuzhiyun gpio_set_value(gpio, !gpio_get_value(gpio));
73*4882a593Smuzhiyun }
74*4882a593Smuzhiyun
gpio_direction_input(unsigned gpio)75*4882a593Smuzhiyun int gpio_direction_input(unsigned gpio)
76*4882a593Smuzhiyun {
77*4882a593Smuzhiyun return gpio_direction(gpio, GPIO_DIRECTION_IN);
78*4882a593Smuzhiyun }
79*4882a593Smuzhiyun
gpio_direction_output(unsigned gpio,int value)80*4882a593Smuzhiyun int gpio_direction_output(unsigned gpio, int value)
81*4882a593Smuzhiyun {
82*4882a593Smuzhiyun int ret = gpio_direction(gpio, GPIO_DIRECTION_OUT);
83*4882a593Smuzhiyun
84*4882a593Smuzhiyun if (ret < 0)
85*4882a593Smuzhiyun return ret;
86*4882a593Smuzhiyun
87*4882a593Smuzhiyun gpio_set_value(gpio, value);
88*4882a593Smuzhiyun return 0;
89*4882a593Smuzhiyun }
90