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iod: Enhance to support display of multiple values 

At present the 'iod' command differs from 'md' in that it only shows a
single value. It is useful to see a dump of multiple values, particularly
when x86 peripherals contain register sets accessible via I/O ports.

Enhance the command to match md.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Bin Meng <bmeng.cn@gmail.com>
[bmeng: correct multi-line comment format style]
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Simon Glass 2019-09-25 08:56:25 -06:00 committed by Bin Meng
parent e37d963ec8
commit 9da3776bf6
1 changed files with 62 additions and 15 deletions
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77
cmd/io.c
View File

@ -11,6 +11,13 @@
#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
*
@ -19,26 +26,66 @@
*/
int do_io_iod(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
{
ulong addr;
int size;
ulong addr, length, bytes;
u8 buf[DISP_LINE_LEN];
int size, todo;
if (argc != 2)
/*
* 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;
size = cmd_get_data_size(argv[0], 4);
if (size < 0)
return 1;
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;
addr = simple_strtoul(argv[1], NULL, 16);
/* Address is specified since argc > 1 */
addr = simple_strtoul(argv[1], NULL, 16);
addr += base_address;
printf("%04x: ", (u16) addr);
/*
* 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);
}
if (size == 4)
printf("%08x\n", inl(addr));
else if (size == 2)
printf("%04x\n", inw(addr));
else
printf("%02x\n", inb(addr));
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;
}
@ -69,7 +116,7 @@ int do_io_iow(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
}
/**************************************************/
U_BOOT_CMD(iod, 2, 0, do_io_iod,
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,