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
|
/*
* This file is part of the coreboot project.
*
* Copyright (C) 2012 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.
*/
#include <device/pci_def.h>
#include <device/device.h>
/* warning: Porting.h includes an open #pragma pack(1) */
#include "Porting.h"
#include "AGESA.h"
#include "amdlib.h"
#include <northbridge/amd/agesa/dimmSpd.h>
/*-----------------------------------------------------------------------------
*
* readSmbusByteData - read a single SPD byte from any offset
*/
static int readSmbusByteData (int iobase, int address, char *buffer, int offset)
{
unsigned int status;
UINT64 limit;
address |= 1; // set read bit
__outbyte (iobase + 0, 0xFF); // clear error status
__outbyte (iobase + 1, 0x1F); // clear error status
__outbyte (iobase + 3, offset); // offset in eeprom
__outbyte (iobase + 4, address); // slave address and read bit
__outbyte (iobase + 2, 0x48); // read byte command
// time limit to avoid hanging for unexpected error status (should never happen)
limit = __rdtsc () + 2000000000 / 10;
for (;;)
{
status = __inbyte (iobase);
if (__rdtsc () > limit) break;
if ((status & 2) == 0) continue; // SMBusInterrupt not set, keep waiting
if ((status & 1) == 1) continue; // HostBusy set, keep waiting
break;
}
buffer [0] = __inbyte (iobase + 5);
if (status == 2) status = 0; // check for done with no errors
return status;
}
/*-----------------------------------------------------------------------------
*
* readSmbusByte - read a single SPD byte from the default offset
* this function is faster function readSmbusByteData
*/
static int readSmbusByte (int iobase, int address, char *buffer)
{
unsigned int status;
UINT64 limit;
__outbyte (iobase + 0, 0xFF); // clear error status
__outbyte (iobase + 2, 0x44); // read command
// time limit to avoid hanging for unexpected error status
limit = __rdtsc () + 2000000000 / 10;
for (;;)
{
status = __inbyte (iobase);
if (__rdtsc () > limit) break;
if ((status & 2) == 0) continue; // SMBusInterrupt not set, keep waiting
if ((status & 1) == 1) continue; // HostBusy set, keep waiting
break;
}
buffer [0] = __inbyte (iobase + 5);
if (status == 2) status = 0; // check for done with no errors
return status;
}
/*---------------------------------------------------------------------------
*
* readspd - Read one or more SPD bytes from a DIMM.
* Start with offset zero and read sequentially.
* Optimization relies on autoincrement to avoid
* sending offset for every byte.
* Reads 128 bytes in 7-8 ms at 400 KHz.
*/
static int readspd (int iobase, int SmbusSlaveAddress, char *buffer, int count)
{
int index, error;
printk(BIOS_SPEW, "-------------READING SPD-----------\n");
printk(BIOS_SPEW, "iobase: 0x%08X, SmbusSlave: 0x%08X, count: %d\n",
iobase, SmbusSlaveAddress, count);
/* read the first byte using offset zero */
error = readSmbusByteData (iobase, SmbusSlaveAddress, buffer, 0);
if (error) {
printk(BIOS_ERR, "-------------SPD READ ERROR-----------\n");
return error;
}
/* read the remaining bytes using auto-increment for speed */
for (index = 1; index < count; index++)
{
error = readSmbusByte (iobase, SmbusSlaveAddress, &buffer [index]);
if (error) {
printk(BIOS_ERR, "-------------SPD READ ERROR-----------\n");
return error;
}
}
printk(BIOS_SPEW, "\n");
printk(BIOS_SPEW, "-------------FINISHED READING SPD-----------\n");
return 0;
}
static void writePmReg (int reg, int data)
{
__outbyte (0xCD6, reg);
__outbyte (0xCD7, data);
}
static void setupFch (int ioBase)
{
writePmReg (0x2D, ioBase >> 8);
writePmReg (0x2C, ioBase | 1);
__outbyte (ioBase + 0x0E, 66000000 / 400000 / 4); // set SMBus clock to 400 KHz
}
int hudson_readSpd(int spdAddress, char *buf, size_t len)
{
int ioBase = 0xB00;
setupFch (ioBase);
return readspd (ioBase, spdAddress, buf, len);
}
|
