1 /*
2 * (C) Copyright 2003
3 * Marc Singer, elf@buici.com
4 *
5 * SPDX-License-Identifier: GPL-2.0+
6 */
7
8 /*
9 * Port I/O Functions
10 *
11 * Copied from FADS ROM, Dan Malek (dmalek@jlc.net)
12 */
13
14 #include <common.h>
15 #include <command.h>
16
17 /* Display values from last command.
18 * Memory modify remembered values are different from display memory.
19 */
20 static uint in_last_addr, in_last_size;
21 static uint out_last_addr, out_last_size, out_last_value;
22
23
do_portio_out(cmd_tbl_t * cmdtp,int flag,int argc,char * const argv[])24 int do_portio_out (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
25 {
26 uint addr = out_last_addr;
27 uint size = out_last_size;
28 uint value = out_last_value;
29
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 * Defaults to long if no or incorrect specification.
37 */
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);
41 }
42 #if defined (CONFIG_X86)
43
44 {
45 unsigned short port = addr;
46
47 switch (size) {
48 default:
49 case 1:
50 {
51 unsigned char ch = value;
52 __asm__ volatile ("out %0, %%dx"::"a" (ch), "d" (port));
53 }
54 break;
55 case 2:
56 {
57 unsigned short w = value;
58 __asm__ volatile ("out %0, %%dx"::"a" (w), "d" (port));
59 }
60 break;
61 case 4:
62 __asm__ volatile ("out %0, %%dx"::"a" (value), "d" (port));
63
64 break;
65 }
66 }
67
68 #endif /* CONFIG_X86 */
69
70 out_last_addr = addr;
71 out_last_size = size;
72 out_last_value = value;
73
74 return 0;
75 }
76
77 U_BOOT_CMD(
78 out, 3, 1, do_portio_out,
79 "write datum to IO port",
80 "[.b, .w, .l] port value\n - output to IO port"
81 );
82
do_portio_in(cmd_tbl_t * cmdtp,int flag,int argc,char * const argv[])83 int do_portio_in (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
84 {
85 uint addr = in_last_addr;
86 uint size = in_last_size;
87
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 * Defaults to long if no or incorrect specification.
95 */
96 size = cmd_get_data_size (argv[0], 1);
97 addr = simple_strtoul (argv[1], NULL, 16);
98 }
99 #if defined (CONFIG_X86)
100
101 {
102 unsigned short port = addr;
103
104 switch (size) {
105 default:
106 case 1:
107 {
108 unsigned char ch;
109 __asm__ volatile ("in %%dx, %0":"=a" (ch):"d" (port));
110
111 printf (" %02x\n", ch);
112 }
113 break;
114 case 2:
115 {
116 unsigned short w;
117 __asm__ volatile ("in %%dx, %0":"=a" (w):"d" (port));
118
119 printf (" %04x\n", w);
120 }
121 break;
122 case 4:
123 {
124 unsigned long l;
125 __asm__ volatile ("in %%dx, %0":"=a" (l):"d" (port));
126
127 printf (" %08lx\n", l);
128 }
129 break;
130 }
131 }
132 #endif /* CONFIG_X86 */
133
134 in_last_addr = addr;
135 in_last_size = size;
136
137 return 0;
138 }
139
140 U_BOOT_CMD(
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"
145 );
146