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/*
* Control GPIO pins on the fly
*
* Copyright (c) 2008 Analog Devices Inc.
*
* Licensed under the GPL-2 or later.
*/
#include <common.h>
#include <command.h>
#include <asm/blackfin.h>
int do_gpio(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
if (argc != 3) {
show_usage:
printf("Usage:\n%s\n", cmdtp->usage);
return 1;
}
/* parse the behavior */
ulong port_cmd = 0;
switch (argv[1][0]) {
case 'i': break;
case 's': port_cmd = (PORTFIO_SET - PORTFIO); break;
case 'c': port_cmd = (PORTFIO_CLEAR - PORTFIO); break;
case 't': port_cmd = (PORTFIO_TOGGLE - PORTFIO); break;
default: goto show_usage;
}
/* parse the pin with format: [p]<fgh><#> */
const char *str_pin = argv[2];
/* grab the [p]<fgh> portion */
ulong port_base;
if (*str_pin == 'p') ++str_pin;
switch (*str_pin) {
case 'f': port_base = PORTFIO; break;
case 'g': port_base = PORTGIO; break;
case 'h': port_base = PORTHIO; break;
default: goto show_usage;
}
/* grab the <#> portion */
ulong pin = simple_strtoul(str_pin+1, NULL, 10);
ulong pin_mask = (1 << pin);
if (pin > 15)
goto show_usage;
/* finally, let's do it: set direction and exec command */
switch (*str_pin) {
case 'f': bfin_write_PORTF_FER(bfin_read_PORTF_FER() & ~pin_mask); break;
case 'g': bfin_write_PORTG_FER(bfin_read_PORTG_FER() & ~pin_mask); break;
case 'h': bfin_write_PORTH_FER(bfin_read_PORTH_FER() & ~pin_mask); break;
}
ulong port_dir = port_base + (PORTFIO_DIR - PORTFIO);
if (argv[1][0] == 'i')
bfin_write16(port_dir, bfin_read16(port_dir) & ~pin_mask);
else {
bfin_write16(port_dir, bfin_read16(port_dir) | pin_mask);
bfin_write16(port_base + port_cmd, pin_mask);
}
printf("gpio: pin %li on port %c has been %c\n", pin, *str_pin, argv[1][0]);
return 0;
}
U_BOOT_CMD(gpio, 3, 0, do_gpio,
"gpio - set/clear/toggle gpio output pins\n",
"<s|c|t> <port><pin>\n"
" - set/clear/toggle the specified pin\n");
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