cmd_portio.c
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/*
* (C) Copyright 2003
* Marc Singer, elf@buici.com
*
* SPDX-License-Identifier: GPL-2.0+
*/
/*
* Port I/O Functions
*
* Copied from FADS ROM, Dan Malek (dmalek@jlc.net)
*/
#include <common.h>
#include <command.h>
/* Display values from last command.
* Memory modify remembered values are different from display memory.
*/
static uint in_last_addr, in_last_size;
static uint out_last_addr, out_last_size, out_last_value;
int do_portio_out (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
{
uint addr = out_last_addr;
uint size = out_last_size;
uint value = out_last_value;
if (argc != 3)
return CMD_RET_USAGE;
if ((flag & CMD_FLAG_REPEAT) == 0) {
/*
* New command specified. Check for a size specification.
* Defaults to long if no or incorrect specification.
*/
size = cmd_get_data_size (argv[0], 1);
addr = simple_strtoul (argv[1], NULL, 16);
value = simple_strtoul (argv[2], NULL, 16);
}
#if defined (CONFIG_X86)
{
unsigned short port = addr;
switch (size) {
default:
case 1:
{
unsigned char ch = value;
__asm__ volatile ("out %0, %%dx"::"a" (ch), "d" (port));
}
break;
case 2:
{
unsigned short w = value;
__asm__ volatile ("out %0, %%dx"::"a" (w), "d" (port));
}
break;
case 4:
__asm__ volatile ("out %0, %%dx"::"a" (value), "d" (port));
break;
}
}
#endif /* CONFIG_X86 */
out_last_addr = addr;
out_last_size = size;
out_last_value = value;
return 0;
}
U_BOOT_CMD(
out, 3, 1, do_portio_out,
"write datum to IO port",
"[.b, .w, .l] port value\n - output to IO port"
);
int do_portio_in (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
{
uint addr = in_last_addr;
uint size = in_last_size;
if (argc != 2)
return CMD_RET_USAGE;
if ((flag & CMD_FLAG_REPEAT) == 0) {
/*
* New command specified. Check for a size specification.
* Defaults to long if no or incorrect specification.
*/
size = cmd_get_data_size (argv[0], 1);
addr = simple_strtoul (argv[1], NULL, 16);
}
#if defined (CONFIG_X86)
{
unsigned short port = addr;
switch (size) {
default:
case 1:
{
unsigned char ch;
__asm__ volatile ("in %%dx, %0":"=a" (ch):"d" (port));
printf (" %02x\n", ch);
}
break;
case 2:
{
unsigned short w;
__asm__ volatile ("in %%dx, %0":"=a" (w):"d" (port));
printf (" %04x\n", w);
}
break;
case 4:
{
unsigned long l;
__asm__ volatile ("in %%dx, %0":"=a" (l):"d" (port));
printf (" %08lx\n", l);
}
break;
}
}
#endif /* CONFIG_X86 */
in_last_addr = addr;
in_last_size = size;
return 0;
}
U_BOOT_CMD(
in, 2, 1, do_portio_in,
"read data from an IO port",
"[.b, .w, .l] port\n"
" - read datum from IO port"
);