portio.c 2.71 KB
Newer Older
1 2 3 4
/*
 * (C) Copyright 2003
 * Marc Singer, elf@buici.com
 *
5
 * SPDX-License-Identifier:	GPL-2.0+
6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
 */

/*
 * 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;


24
int do_portio_out (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
25 26 27 28 29
{
	uint addr = out_last_addr;
	uint size = out_last_size;
	uint value = out_last_value;

30
	if (argc != 3)
31
		return CMD_RET_USAGE;
32 33

	if ((flag & CMD_FLAG_REPEAT) == 0) {
34 35
		/*
		 * New command specified.  Check for a size specification.
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
		 * 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;
}

77 78
U_BOOT_CMD(
	out,	3,	1,	do_portio_out,
Peter Tyser's avatar
Peter Tyser committed
79
	"write datum to IO port",
80
	"[.b, .w, .l] port value\n    - output to IO port"
81 82
);

83
int do_portio_in (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
84 85 86 87
{
	uint addr = in_last_addr;
	uint size = in_last_size;

88
	if (argc != 2)
89
		return CMD_RET_USAGE;
90 91

	if ((flag & CMD_FLAG_REPEAT) == 0) {
92 93
		/*
		 * New command specified.  Check for a size specification.
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
		 * 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;
}

140 141
U_BOOT_CMD(
	in,	2,	1,	do_portio_in,
Peter Tyser's avatar
Peter Tyser committed
142
	"read data from an IO port",
143
	"[.b, .w, .l] port\n"
144
	"    - read datum from IO port"
145
);