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/*
* Control GPIO pins on the fly
*
* Copyright (c) 2008-2010 Analog Devices Inc.
*
* Licensed under the GPL-2 or later.
*/
#include <common.h>
#include <command.h>
#include <asm/blackfin.h>
#include <asm/gpio.h>
enum {
GPIO_INPUT,
GPIO_SET,
GPIO_CLEAR,
GPIO_TOGGLE,
};
int do_gpio(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
if (argc == 2 && !strcmp(argv[1], "status")) {
bfin_gpio_labels();
return 0;
}
if (argc != 3) {
show_usage:
printf("Usage:\n%s\n", cmdtp->usage);
return 1;
}
/* parse the behavior */
ulong sub_cmd;
switch (argv[1][0]) {
case 'i': sub_cmd = GPIO_INPUT; break;
case 's': sub_cmd = GPIO_SET; break;
case 'c': sub_cmd = GPIO_CLEAR; break;
case 't': sub_cmd = GPIO_TOGGLE; break;
default: goto show_usage;
}
/* parse the pin with format: [p][port]<#> */
const char *str_pin = argv[2];
/* grab the [p]<port> portion */
ulong port_base;
if (*str_pin == 'p') ++str_pin;
switch (*str_pin) {
#ifdef GPIO_PA0
case 'a': port_base = GPIO_PA0; break;
#endif
#ifdef GPIO_PB0
case 'b': port_base = GPIO_PB0; break;
#endif
#ifdef GPIO_PC0
case 'c': port_base = GPIO_PC0; break;
#endif
#ifdef GPIO_PD0
case 'd': port_base = GPIO_PD0; break;
#endif
#ifdef GPIO_PE0
case 'e': port_base = GPIO_PE0; break;
#endif
#ifdef GPIO_PF0
case 'f': port_base = GPIO_PF0; break;
#endif
#ifdef GPIO_PG0
case 'g': port_base = GPIO_PG0; break;
#endif
#ifdef GPIO_PH0
case 'h': port_base = GPIO_PH0; break;
#endif
#ifdef GPIO_PI0
case 'i': port_base = GPIO_PI0; break;
#endif
#ifdef GPIO_PJ
case 'j': port_base = GPIO_PJ0; break;
#endif
default: goto show_usage;
}
/* grab the <#> portion */
ulong pin = simple_strtoul(str_pin + 1, NULL, 10);
if (pin > 15)
goto show_usage;
/* grab the pin before we tweak it */
ulong gpio = port_base + pin;
gpio_request(gpio, "cmd_gpio");
/* finally, let's do it: set direction and exec command */
if (sub_cmd == GPIO_INPUT) {
gpio_direction_input(gpio);
printf("gpio: pin %lu on port %c set to input\n", pin, *str_pin);
return 0;
}
ulong value;
switch (sub_cmd) {
case GPIO_SET: value = 1; break;
case GPIO_CLEAR: value = 0; break;
case GPIO_TOGGLE: value = !gpio_get_value(gpio); break;
default: goto show_usage;
}
gpio_direction_output(gpio, value);
printf("gpio: pin %lu on port %c (gpio %lu) value is %lu\n",
pin, *str_pin, gpio, value);
gpio_free(gpio);
return 0;
}
U_BOOT_CMD(gpio, 3, 0, do_gpio,
"set/clear/toggle gpio output pins",
"<set|clear|toggle> <port><pin>\n"
" - set/clear/toggle the specified pin (e.g. PF10)");
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