]>
git.ipfire.org Git - people/ms/u-boot.git/blob - cmd/portio.c
3 * Marc Singer, elf@buici.com
5 * SPDX-License-Identifier: GPL-2.0+
11 * Copied from FADS ROM, Dan Malek (dmalek@jlc.net)
17 /* Display values from last command.
18 * Memory modify remembered values are different from display memory.
20 static uint in_last_addr
, in_last_size
;
21 static uint out_last_addr
, out_last_size
, out_last_value
;
24 int do_portio_out (cmd_tbl_t
* cmdtp
, int flag
, int argc
, char * const argv
[])
26 uint addr
= out_last_addr
;
27 uint size
= out_last_size
;
28 uint value
= out_last_value
;
33 if ((flag
& CMD_FLAG_REPEAT
) == 0) {
35 * New command specified. Check for a size specification.
36 * Defaults to long if no or incorrect specification.
38 size
= cmd_get_data_size (argv
[0], 1);
39 addr
= simple_strtoul (argv
[1], NULL
, 16);
40 value
= simple_strtoul (argv
[2], NULL
, 16);
42 #if defined (CONFIG_X86)
45 unsigned short port
= addr
;
51 unsigned char ch
= value
;
52 __asm__
volatile ("out %0, %%dx"::"a" (ch
), "d" (port
));
57 unsigned short w
= value
;
58 __asm__
volatile ("out %0, %%dx"::"a" (w
), "d" (port
));
62 __asm__
volatile ("out %0, %%dx"::"a" (value
), "d" (port
));
68 #endif /* CONFIG_X86 */
72 out_last_value
= value
;
78 out
, 3, 1, do_portio_out
,
79 "write datum to IO port",
80 "[.b, .w, .l] port value\n - output to IO port"
83 int do_portio_in (cmd_tbl_t
* cmdtp
, int flag
, int argc
, char * const argv
[])
85 uint addr
= in_last_addr
;
86 uint size
= in_last_size
;
91 if ((flag
& CMD_FLAG_REPEAT
) == 0) {
93 * New command specified. Check for a size specification.
94 * Defaults to long if no or incorrect specification.
96 size
= cmd_get_data_size (argv
[0], 1);
97 addr
= simple_strtoul (argv
[1], NULL
, 16);
99 #if defined (CONFIG_X86)
102 unsigned short port
= addr
;
109 __asm__
volatile ("in %%dx, %0":"=a" (ch
):"d" (port
));
111 printf (" %02x\n", ch
);
117 __asm__
volatile ("in %%dx, %0":"=a" (w
):"d" (port
));
119 printf (" %04x\n", w
);
125 __asm__
volatile ("in %%dx, %0":"=a" (l
):"d" (port
));
127 printf (" %08lx\n", l
);
132 #endif /* CONFIG_X86 */
141 in
, 2, 1, do_portio_in
,
142 "read data from an IO port",
143 "[.b, .w, .l] port\n"
144 " - read datum from IO port"