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
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
|
/* SPDX-License-Identifier: GPL-2.0-only */
#include <console/console.h>
#include <device/device.h>
#include <arch/io.h>
#include <timer.h>
#include "ipmi_kcs.h"
#define IPMI_KCS_STATE(_x) ((_x) >> 6)
#define IPMI_KCS_GET_STATUS_ABORT 0x60
#define IPMI_KCS_START_WRITE 0x61
#define IPMI_KCS_END_WRITE 0x62
#define IPMI_KCS_READ_BYTE 0x68
#define IPMI_KCS_OBF 0x01
#define IPMI_KCS_IBF 0x02
#define IPMI_KCS_ATN 0x04
#define IPMI_KCS_STATE_IDLE 0x00
#define IPMI_KCS_STATE_READ 0x01
#define IPMI_KCS_STATE_WRITE 0x02
#define IPMI_KCS_STATE_ERROR 0x03
#define IPMI_CMD(_x) ((_x) + CONFIG_IPMI_KCS_REGISTER_SPACING)
#define IPMI_DATA(_x) ((_x))
#define IPMI_STAT(_x) ((_x) + CONFIG_IPMI_KCS_REGISTER_SPACING)
static unsigned char ipmi_kcs_status(int port)
{
unsigned char status = inb(IPMI_STAT(port));
printk(BIOS_SPEW, "%s: 0x%02x\n", __func__, status);
return status;
}
static int wait_ibf_timeout(int port)
{
if (!wait_ms(CONFIG_IPMI_KCS_TIMEOUT_MS, !(ipmi_kcs_status(port) & IPMI_KCS_IBF))) {
printk(BIOS_ERR, "wait_ibf timeout!\n");
return 1;
} else {
return 0;
}
}
static int wait_obf_timeout(int port)
{
if (!wait_ms(CONFIG_IPMI_KCS_TIMEOUT_MS, (ipmi_kcs_status(port) & IPMI_KCS_OBF))) {
printk(BIOS_ERR, "wait_obf timeout!\n");
return 1;
} else {
return 0;
}
}
static int ipmi_kcs_send_data_byte(int port, const unsigned char byte)
{
unsigned char status;
printk(BIOS_SPEW, "%s: 0x%02x\n", __func__, byte);
outb(byte, IPMI_DATA(port));
if (wait_ibf_timeout(port))
return 1;
status = ipmi_kcs_status(port);
if ((status & IPMI_KCS_OBF) &&
IPMI_KCS_STATE(status) != IPMI_KCS_STATE_WRITE) {
printk(BIOS_ERR, "%s: status %02x\n", __func__, status);
return 1;
}
if (ipmi_kcs_status(port) & IPMI_KCS_OBF)
inb(IPMI_DATA(port));
return 0;
}
static int ipmi_kcs_send_last_data_byte(int port, const unsigned char byte)
{
unsigned char status;
printk(BIOS_SPEW, "%s: 0x%02x\n", __func__, byte);
if (wait_ibf_timeout(port))
return 1;
status = ipmi_kcs_status(port);
if ((status & IPMI_KCS_OBF) &&
IPMI_KCS_STATE(status) != IPMI_KCS_STATE_WRITE) {
printk(BIOS_ERR, "%s: status %02x\n", __func__, status);
return 1;
}
if (ipmi_kcs_status(port) & IPMI_KCS_OBF)
inb(IPMI_DATA(port));
outb(byte, IPMI_DATA(port));
return 0;
}
static int ipmi_kcs_send_cmd_byte(int port, const unsigned char byte)
{
printk(BIOS_SPEW, "%s: 0x%02x\n", __func__, byte);
if (wait_ibf_timeout(port))
return 1;
if (ipmi_kcs_status(port) & IPMI_KCS_OBF)
inb(IPMI_DATA(port));
outb(byte, IPMI_CMD(port));
if (wait_ibf_timeout(port))
return 1;
if (ipmi_kcs_status(port) & IPMI_KCS_OBF)
inb(IPMI_DATA(port));
return 0;
}
static int ipmi_kcs_send_message(int port, int netfn, int lun, int cmd,
const unsigned char *msg, int len)
{
int ret;
ret = ipmi_kcs_send_cmd_byte(port, IPMI_KCS_START_WRITE);
if (ret) {
printk(BIOS_ERR, "IPMI START WRITE failed\n");
return ret;
}
ret = ipmi_kcs_send_data_byte(port, (netfn << 2) | (lun & 3));
if (ret) {
printk(BIOS_ERR, "IPMI NETFN failed\n");
return ret;
}
if (!len) {
ret = ipmi_kcs_send_cmd_byte(port, IPMI_KCS_END_WRITE);
if (ret) {
printk(BIOS_ERR, "IPMI END WRITE failed\n");
return ret;
}
ret = ipmi_kcs_send_last_data_byte(port, cmd);
if (ret) {
printk(BIOS_ERR, "IPMI BYTE WRITE failed\n");
return ret;
}
} else {
ret = ipmi_kcs_send_data_byte(port, cmd);
if (ret) {
printk(BIOS_ERR, "IPMI CMD failed\n");
return ret;
}
while (len > 1) {
ret = ipmi_kcs_send_data_byte(port, *msg++);
if (ret) {
printk(BIOS_ERR, "IPMI BYTE WRITE failed\n");
return ret;
}
len--;
}
ret = ipmi_kcs_send_cmd_byte(port, IPMI_KCS_END_WRITE);
if (ret) {
printk(BIOS_ERR, "IPMI END WRITE failed\n");
return ret;
}
ret = ipmi_kcs_send_last_data_byte(port, *msg);
if (ret) {
printk(BIOS_ERR, "IPMI BYTE WRITE failed\n");
return ret;
}
}
return 0;
}
static int ipmi_kcs_read_message(int port, unsigned char *msg, int len)
{
int status, ret = 0;
if (wait_ibf_timeout(port))
return 1;
for (;;) {
status = ipmi_kcs_status(port);
if (IPMI_KCS_STATE(status) == IPMI_KCS_STATE_IDLE)
return ret;
if (IPMI_KCS_STATE(status) != IPMI_KCS_STATE_READ) {
printk(BIOS_ERR, "%s: wrong state: 0x%02x\n", __func__,
status);
return -1;
}
if (wait_obf_timeout(port))
return -1;
if (msg && (ret < len)) {
*msg++ = inb(IPMI_DATA(port));
ret++;
}
if (wait_ibf_timeout(port))
return -1;
outb(IPMI_KCS_READ_BYTE, IPMI_DATA(port));
}
return ret;
}
int ipmi_kcs_message(int port, int netfn, int lun, int cmd,
const unsigned char *inmsg, int inlen,
unsigned char *outmsg, int outlen)
{
if (ipmi_kcs_send_message(port, netfn, lun, cmd, inmsg, inlen)) {
printk(BIOS_ERR, "ipmi_kcs_send_message failed\n");
return -1;
}
return ipmi_kcs_read_message(port, outmsg, outlen);
}
|
