1 /*
2 * (C) Copyright 2003
3 * Marc Singer, elf@buici.com
4 *
5 * See file CREDITS for list of people who contributed to this
6 * project.
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of
11 * the License, or (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
21 * MA 02111-1307 USA
22 */
23
24 /*
25 * Port I/O Functions
26 *
27 * Copied from FADS ROM, Dan Malek (dmalek@jlc.net)
28 */
29
30 #include <common.h>
31 #include <command.h>
32
33 /* Display values from last command.
34 * Memory modify remembered values are different from display memory.
35 */
36 static uint in_last_addr, in_last_size;
37 static uint out_last_addr, out_last_size, out_last_value;
38
39
do_portio_out(cmd_tbl_t * cmdtp,int flag,int argc,char * argv[])40 int do_portio_out (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
41 {
42 uint addr = out_last_addr;
43 uint size = out_last_size;
44 uint value = out_last_value;
45
46 if (argc != 3) {
47 cmd_usage(cmdtp);
48 return 1;
49 }
50
51 if ((flag & CMD_FLAG_REPEAT) == 0) {
52 /* New command specified. Check for a size specification.
53 * Defaults to long if no or incorrect specification.
54 */
55 size = cmd_get_data_size (argv[0], 1);
56 addr = simple_strtoul (argv[1], NULL, 16);
57 value = simple_strtoul (argv[2], NULL, 16);
58 }
59 #if defined (CONFIG_X86)
60
61 {
62 unsigned short port = addr;
63
64 switch (size) {
65 default:
66 case 1:
67 {
68 unsigned char ch = value;
69 __asm__ volatile ("out %0, %%dx"::"a" (ch), "d" (port));
70 }
71 break;
72 case 2:
73 {
74 unsigned short w = value;
75 __asm__ volatile ("out %0, %%dx"::"a" (w), "d" (port));
76 }
77 break;
78 case 4:
79 __asm__ volatile ("out %0, %%dx"::"a" (value), "d" (port));
80
81 break;
82 }
83 }
84
85 #endif /* CONFIG_X86 */
86
87 out_last_addr = addr;
88 out_last_size = size;
89 out_last_value = value;
90
91 return 0;
92 }
93
94 U_BOOT_CMD(
95 out, 3, 1, do_portio_out,
96 "write datum to IO port",
97 "[.b, .w, .l] port value\n - output to IO port"
98 );
99
do_portio_in(cmd_tbl_t * cmdtp,int flag,int argc,char * argv[])100 int do_portio_in (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
101 {
102 uint addr = in_last_addr;
103 uint size = in_last_size;
104
105 if (argc != 2) {
106 cmd_usage(cmdtp);
107 return 1;
108 }
109
110 if ((flag & CMD_FLAG_REPEAT) == 0) {
111 /* New command specified. Check for a size specification.
112 * Defaults to long if no or incorrect specification.
113 */
114 size = cmd_get_data_size (argv[0], 1);
115 addr = simple_strtoul (argv[1], NULL, 16);
116 }
117 #if defined (CONFIG_X86)
118
119 {
120 unsigned short port = addr;
121
122 switch (size) {
123 default:
124 case 1:
125 {
126 unsigned char ch;
127 __asm__ volatile ("in %%dx, %0":"=a" (ch):"d" (port));
128
129 printf (" %02x\n", ch);
130 }
131 break;
132 case 2:
133 {
134 unsigned short w;
135 __asm__ volatile ("in %%dx, %0":"=a" (w):"d" (port));
136
137 printf (" %04x\n", w);
138 }
139 break;
140 case 4:
141 {
142 unsigned long l;
143 __asm__ volatile ("in %%dx, %0":"=a" (l):"d" (port));
144
145 printf (" %08lx\n", l);
146 }
147 break;
148 }
149 }
150 #endif /* CONFIG_X86 */
151
152 in_last_addr = addr;
153 in_last_size = size;
154
155 return 0;
156 }
157
158 U_BOOT_CMD(
159 in, 2, 1, do_portio_in,
160 "read data from an IO port",
161 "[.b, .w, .l] port\n"
162 " - read datum from IO port"
163 );
164