summaryrefslogtreecommitdiffstats
path: root/cmd/portio.c
blob: bf3a99791ce2d8a7f924c74a4b7c5fb308623535 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
/*
 * (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"
);
OpenPOWER on IntegriCloud