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
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
|
/*
* This file is part of the coreboot project.
*
* Copyright (C) 2010 Advanced Micro Devices, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc.
*/
#ifndef _HUDSON_SMBUS_C_
#define _HUDSON_SMBUS_C_
#include <io.h>
#include <stdint.h>
#include "smbus.h"
static int smbus_wait_until_ready(u32 smbus_io_base)
{
u32 loops;
loops = SMBUS_TIMEOUT;
do {
u8 val;
val = inb(smbus_io_base + SMBHSTSTAT);
val &= 0x1f;
if (val == 0) { /* ready now */
return 0;
}
outb(val, smbus_io_base + SMBHSTSTAT);
} while (--loops);
return -2; /* time out */
}
static int smbus_wait_until_done(u32 smbus_io_base)
{
u32 loops;
loops = SMBUS_TIMEOUT;
do {
u8 val;
val = inb(smbus_io_base + SMBHSTSTAT);
val &= 0x1f; /* mask off reserved bits */
if (val & 0x1c) {
return -5; /* error */
}
if (val == 0x02) {
outb(val, smbus_io_base + SMBHSTSTAT); /* clear status */
return 0;
}
} while (--loops);
return -3; /* timeout */
}
int do_smbus_recv_byte(u32 smbus_io_base, u32 device)
{
u8 byte;
if (smbus_wait_until_ready(smbus_io_base) < 0) {
return -2; /* not ready */
}
/* set the device I'm talking too */
outb(((device & 0x7f) << 1) | 1, smbus_io_base + SMBHSTADDR);
byte = inb(smbus_io_base + SMBHSTCTRL);
byte &= 0xe3; /* Clear [4:2] */
byte |= (1 << 2) | (1 << 6); /* Byte data read/write command, start the command */
outb(byte, smbus_io_base + SMBHSTCTRL);
/* poll for transaction completion */
if (smbus_wait_until_done(smbus_io_base) < 0) {
return -3; /* timeout or error */
}
/* read results of transaction */
byte = inb(smbus_io_base + SMBHSTCMD);
return byte;
}
int do_smbus_send_byte(u32 smbus_io_base, u32 device, u8 val)
{
u8 byte;
if (smbus_wait_until_ready(smbus_io_base) < 0) {
return -2; /* not ready */
}
/* set the command... */
outb(val, smbus_io_base + SMBHSTCMD);
/* set the device I'm talking too */
outb(((device & 0x7f) << 1) | 0, smbus_io_base + SMBHSTADDR);
byte = inb(smbus_io_base + SMBHSTCTRL);
byte &= 0xe3; /* Clear [4:2] */
byte |= (1 << 2) | (1 << 6); /* Byte data read/write command, start the command */
outb(byte, smbus_io_base + SMBHSTCTRL);
/* poll for transaction completion */
if (smbus_wait_until_done(smbus_io_base) < 0) {
return -3; /* timeout or error */
}
return 0;
}
int do_smbus_read_byte(u32 smbus_io_base, u32 device,
u32 address)
{
u8 byte;
if (smbus_wait_until_ready(smbus_io_base) < 0) {
return -2; /* not ready */
}
/* set the command/address... */
outb(address & 0xff, smbus_io_base + SMBHSTCMD);
/* set the device I'm talking too */
outb(((device & 0x7f) << 1) | 1, smbus_io_base + SMBHSTADDR);
byte = inb(smbus_io_base + SMBHSTCTRL);
byte &= 0xe3; /* Clear [4:2] */
byte |= (1 << 3) | (1 << 6); /* Byte data read/write command, start the command */
outb(byte, smbus_io_base + SMBHSTCTRL);
/* poll for transaction completion */
if (smbus_wait_until_done(smbus_io_base) < 0) {
return -3; /* timeout or error */
}
/* read results of transaction */
byte = inb(smbus_io_base + SMBHSTDAT0);
return byte;
}
int do_smbus_write_byte(u32 smbus_io_base, u32 device,
u32 address, u8 val)
{
u8 byte;
if (smbus_wait_until_ready(smbus_io_base) < 0) {
return -2; /* not ready */
}
/* set the command/address... */
outb(address & 0xff, smbus_io_base + SMBHSTCMD);
/* set the device I'm talking too */
outb(((device & 0x7f) << 1) | 0, smbus_io_base + SMBHSTADDR);
/* output value */
outb(val, smbus_io_base + SMBHSTDAT0);
byte = inb(smbus_io_base + SMBHSTCTRL);
byte &= 0xe3; /* Clear [4:2] */
byte |= (1 << 3) | (1 << 6); /* Byte data read/write command, start the command */
outb(byte, smbus_io_base + SMBHSTCTRL);
/* poll for transaction completion */
if (smbus_wait_until_done(smbus_io_base) < 0) {
return -3; /* timeout or error */
}
return 0;
}
void alink_ab_indx(u32 reg_space, u32 reg_addr,
u32 mask, u32 val)
{
u32 tmp;
outl((reg_space & 0x7) << 29 | reg_addr, AB_INDX);
tmp = inl(AB_DATA);
/* rpr 4.2
* For certain revisions of the chip, the ABCFG registers,
* with an address of 0x100NN (where 'N' is any hexadecimal
* number), require an extra programming step.*/
outl(0, AB_INDX);
tmp &= ~mask;
tmp |= val;
/* printk(BIOS_DEBUG, "about write %x, index=%x", tmp, (reg_space&0x3)<<29 | reg_addr); */
outl((reg_space & 0x7) << 29 | reg_addr, AB_INDX); /* probably we dont have to do it again. */
outl(tmp, AB_DATA);
outl(0, AB_INDX);
}
void alink_rc_indx(u32 reg_space, u32 reg_addr, u32 port,
u32 mask, u32 val)
{
u32 tmp;
outl((reg_space & 0x7) << 29 | (port & 3) << 24 | reg_addr, AB_INDX);
tmp = inl(AB_DATA);
/* rpr 4.2
* For certain revisions of the chip, the ABCFG registers,
* with an address of 0x100NN (where 'N' is any hexadecimal
* number), require an extra programming step.*/
outl(0, AB_INDX);
tmp &= ~mask;
tmp |= val;
//printk(BIOS_DEBUG, "about write %x, index=%x", tmp, (reg_space&0x3)<<29 | (port&3) << 24 | reg_addr);
outl((reg_space & 0x7) << 29 | (port & 3) << 24 | reg_addr, AB_INDX); /* probably we dont have to do it again. */
outl(tmp, AB_DATA);
outl(0, AB_INDX);
}
/* space = 0: AX_INDXC, AX_DATAC
* space = 1: AX_INDXP, AX_DATAP
*/
void alink_ax_indx(u32 space /*c or p? */ , u32 axindc,
u32 mask, u32 val)
{
u32 tmp;
/* read axindc to tmp */
outl(space << 29 | space << 3 | 0x30, AB_INDX);
outl(axindc, AB_DATA);
outl(0, AB_INDX);
outl(space << 29 | space << 3 | 0x34, AB_INDX);
tmp = inl(AB_DATA);
outl(0, AB_INDX);
tmp &= ~mask;
tmp |= val;
/* write tmp */
outl(space << 29 | space << 3 | 0x30, AB_INDX);
outl(axindc, AB_DATA);
outl(0, AB_INDX);
outl(space << 29 | space << 3 | 0x34, AB_INDX);
outl(tmp, AB_DATA);
outl(0, AB_INDX);
}
#endif
|
