3 * Guennadi Liakhovetski, DENX Software Engineering, <lg@denx.de>
6 * Stefano Babic, DENX Software Engineering, <sbabic@denx.de>
8 * See file CREDITS for list of people who contributed to this
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License as
13 * published by the Free Software Foundation; either version 2 of
14 * the License, or (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
27 #include <asm/arch/imx-regs.h>
32 enum mxc_gpio_direction {
33 MXC_GPIO_DIRECTION_IN,
34 MXC_GPIO_DIRECTION_OUT,
37 #define GPIO_TO_PORT(n) (n / 32)
39 /* GPIO port description */
40 static unsigned long gpio_ports[] = {
41 [0] = GPIO1_BASE_ADDR,
42 [1] = GPIO2_BASE_ADDR,
43 [2] = GPIO3_BASE_ADDR,
44 #if defined(CONFIG_MX51) || defined(CONFIG_MX53) || defined(CONFIG_MX6Q)
45 [3] = GPIO4_BASE_ADDR,
47 #if defined(CONFIG_MX53) || defined(CONFIG_MX6Q)
48 [4] = GPIO5_BASE_ADDR,
49 [5] = GPIO6_BASE_ADDR,
50 [6] = GPIO7_BASE_ADDR,
54 static int mxc_gpio_direction(unsigned int gpio,
55 enum mxc_gpio_direction direction)
57 unsigned int port = GPIO_TO_PORT(gpio);
58 struct gpio_regs *regs;
61 if (port >= ARRAY_SIZE(gpio_ports))
66 regs = (struct gpio_regs *)gpio_ports[port];
68 l = readl(®s->gpio_dir);
71 case MXC_GPIO_DIRECTION_OUT:
74 case MXC_GPIO_DIRECTION_IN:
77 writel(l, ®s->gpio_dir);
82 int gpio_set_value(unsigned gpio, int value)
84 unsigned int port = GPIO_TO_PORT(gpio);
85 struct gpio_regs *regs;
88 if (port >= ARRAY_SIZE(gpio_ports))
93 regs = (struct gpio_regs *)gpio_ports[port];
95 l = readl(®s->gpio_dr);
100 writel(l, ®s->gpio_dr);
105 int gpio_get_value(unsigned gpio)
107 unsigned int port = GPIO_TO_PORT(gpio);
108 struct gpio_regs *regs;
111 if (port >= ARRAY_SIZE(gpio_ports))
116 regs = (struct gpio_regs *)gpio_ports[port];
118 val = (readl(®s->gpio_dr) >> gpio) & 0x01;
123 int gpio_request(unsigned gpio, const char *label)
125 unsigned int port = GPIO_TO_PORT(gpio);
126 if (port >= ARRAY_SIZE(gpio_ports))
131 int gpio_free(unsigned gpio)
136 int gpio_direction_input(unsigned gpio)
138 return mxc_gpio_direction(gpio, MXC_GPIO_DIRECTION_IN);
141 int gpio_direction_output(unsigned gpio, int value)
143 int ret = mxc_gpio_direction(gpio, MXC_GPIO_DIRECTION_OUT);
148 return gpio_set_value(gpio, value);