io.c
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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2012 The Chromium OS Authors.
*/
/*
* IO space access commands.
*/
#include <common.h>
#include <command.h>
#include <asm/io.h>
/* Display values from last command */
static ulong last_addr, last_size;
static ulong last_length = 0x40;
static ulong base_address;
#define DISP_LINE_LEN 16
/*
* IO Display
*
* Syntax:
* iod{.b, .w, .l} {addr}
*/
int do_io_iod(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
{
ulong addr, length, bytes;
u8 buf[DISP_LINE_LEN];
int size, todo;
/*
* We use the last specified parameters, unless new ones are
* entered.
*/
addr = last_addr;
size = last_size;
length = last_length;
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], 4);
if (size < 0)
return 1;
/* Address is specified since argc > 1 */
addr = simple_strtoul(argv[1], NULL, 16);
addr += base_address;
/*
* If another parameter, it is the length to display.
* Length is the number of objects, not number of bytes.
*/
if (argc > 2)
length = simple_strtoul(argv[2], NULL, 16);
}
bytes = size * length;
/* Print the lines */
for (; bytes > 0; addr += todo) {
u8 *ptr = buf;
int i;
todo = min(bytes, (ulong)DISP_LINE_LEN);
for (i = 0; i < todo; i += size, ptr += size) {
if (size == 4)
*(u32 *)ptr = inl(addr + i);
else if (size == 2)
*(u16 *)ptr = inw(addr + i);
else
*ptr = inb(addr + i);
}
print_buffer(addr, buf, size, todo / size,
DISP_LINE_LEN / size);
bytes -= todo;
}
last_addr = addr;
last_length = length;
last_size = size;
return 0;
}
int do_io_iow(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
{
ulong addr, val;
int size;
if (argc != 3)
return CMD_RET_USAGE;
size = cmd_get_data_size(argv[0], 4);
if (size < 0)
return 1;
addr = simple_strtoul(argv[1], NULL, 16);
val = simple_strtoul(argv[2], NULL, 16);
if (size == 4)
outl((u32) val, addr);
else if (size == 2)
outw((u16) val, addr);
else
outb((u8) val, addr);
return 0;
}
/**************************************************/
U_BOOT_CMD(iod, 3, 1, do_io_iod,
"IO space display", "[.b, .w, .l] address");
U_BOOT_CMD(iow, 3, 0, do_io_iow,
"IO space modify",
"[.b, .w, .l] address value");