146 lines
2.7 KiB
C
146 lines
2.7 KiB
C
/*
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* (C) Copyright 2003
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* Marc Singer, elf@buici.com
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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/*
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* Port I/O Functions
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*
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* Copied from FADS ROM, Dan Malek (dmalek@jlc.net)
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*/
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#include <common.h>
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#include <command.h>
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/* Display values from last command.
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* Memory modify remembered values are different from display memory.
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*/
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static uint in_last_addr, in_last_size;
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static uint out_last_addr, out_last_size, out_last_value;
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int do_portio_out (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
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{
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uint addr = out_last_addr;
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uint size = out_last_size;
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uint value = out_last_value;
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if (argc != 3)
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return CMD_RET_USAGE;
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if ((flag & CMD_FLAG_REPEAT) == 0) {
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/*
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* New command specified. Check for a size specification.
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* Defaults to long if no or incorrect specification.
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*/
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size = cmd_get_data_size (argv[0], 1);
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addr = simple_strtoul (argv[1], NULL, 16);
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value = simple_strtoul (argv[2], NULL, 16);
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}
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#if defined (CONFIG_X86)
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{
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unsigned short port = addr;
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switch (size) {
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default:
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case 1:
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{
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unsigned char ch = value;
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__asm__ volatile ("out %0, %%dx"::"a" (ch), "d" (port));
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}
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break;
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case 2:
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{
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unsigned short w = value;
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__asm__ volatile ("out %0, %%dx"::"a" (w), "d" (port));
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}
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break;
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case 4:
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__asm__ volatile ("out %0, %%dx"::"a" (value), "d" (port));
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break;
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}
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}
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#endif /* CONFIG_X86 */
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out_last_addr = addr;
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out_last_size = size;
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out_last_value = value;
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return 0;
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}
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U_BOOT_CMD(
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out, 3, 1, do_portio_out,
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"write datum to IO port",
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"[.b, .w, .l] port value\n - output to IO port"
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);
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int do_portio_in (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
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{
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uint addr = in_last_addr;
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uint size = in_last_size;
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if (argc != 2)
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return CMD_RET_USAGE;
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if ((flag & CMD_FLAG_REPEAT) == 0) {
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/*
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* New command specified. Check for a size specification.
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* Defaults to long if no or incorrect specification.
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*/
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size = cmd_get_data_size (argv[0], 1);
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addr = simple_strtoul (argv[1], NULL, 16);
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}
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#if defined (CONFIG_X86)
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{
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unsigned short port = addr;
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switch (size) {
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default:
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case 1:
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{
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unsigned char ch;
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__asm__ volatile ("in %%dx, %0":"=a" (ch):"d" (port));
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printf (" %02x\n", ch);
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}
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break;
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case 2:
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{
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unsigned short w;
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__asm__ volatile ("in %%dx, %0":"=a" (w):"d" (port));
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printf (" %04x\n", w);
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}
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break;
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case 4:
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{
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unsigned long l;
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__asm__ volatile ("in %%dx, %0":"=a" (l):"d" (port));
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printf (" %08lx\n", l);
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}
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break;
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}
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}
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#endif /* CONFIG_X86 */
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in_last_addr = addr;
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in_last_size = size;
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return 0;
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}
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U_BOOT_CMD(
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in, 2, 1, do_portio_in,
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"read data from an IO port",
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"[.b, .w, .l] port\n"
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" - read datum from IO port"
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);
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