summaryrefslogtreecommitdiff
path: root/src/northbridge/amd/agesa/family12/dimmSpd.c
blob: 55fb2c3b2296c31b9c5b828591ced957247dc660 (plain)
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
/*****************************************************************************
 *
 * Copyright (c) 2011, Advanced Micro Devices, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of Advanced Micro Devices, Inc. nor the names of
 *       its contributors may be used to endorse or promote products derived
 *       from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL ADVANCED MICRO DEVICES, INC. BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 ***************************************************************************/

/*----------------------------------------------------------------------------------------
 *                             M O D U L E S    U S E D
 *----------------------------------------------------------------------------------------
 */

#include "Porting.h"
#include "AGESA.h"
#include "amdlib.h"
#include "dimmSpd.h"

/*----------------------------------------------------------------------------------------
 *                   D E F I N I T I O N S    A N D    M A C R O S
 *----------------------------------------------------------------------------------------
 */
#define SMBUS_BASE_ADDR  0xB00
#define DIMENSION(array)(sizeof (array)/ sizeof (array [0]))

/*----------------------------------------------------------------------------------------
 *                  T Y P E D E F S     A N D     S T R U C T U  R E S
 *----------------------------------------------------------------------------------------
 */

typedef struct _DIMM_INFO_SMBUS{
  UINT8   SocketId;
  UINT8   MemChannelId;
  UINT8   DimmId;
  UINT8   SmbusAddress;
} DIMM_INFO_SMBUS;
/*
* SPD address table - porting required
*/
STATIC CONST DIMM_INFO_SMBUS SpdAddrLookup [] =
{
  /* Socket, Channel, Dimm, Smbus */
  {0, 0, 0, 0xA0},
  {0, 1, 0, 0xA2}
};

/*----------------------------------------------------------------------------------------
 *           P R O T O T Y P E S     O F     L O C A L     F U  N C T I O N S
 *----------------------------------------------------------------------------------------
 */

/*----------------------------------------------------------------------------------------
 *                          E X P O R T E D    F U N C T I O N S
 *----------------------------------------------------------------------------------------
 */

/*---------------------------------------------------------------------------------------
 *                          L O C A L    F U N C T I O N S
 *---------------------------------------------------------------------------------------
 */

STATIC
VOID
WritePmReg (
  IN UINT8 Reg,
  IN UINT8 Data
  )
{
   __outbyte (0xCD6, Reg);
   __outbyte (0xCD7, Data);
}
STATIC
VOID
SetupFch (
  IN UINT16
  IN IoBase
  )
{
   WritePmReg (0x2D, IoBase >> 8);
   WritePmReg (0x2C, IoBase | 1);
   WritePmReg (0x29, 0x80);
   WritePmReg (0x28, 0x61);
   /* set SMBus clock to 400 KHz */
   __outbyte (IoBase + 0x0E, 66000000 / 400000 / 4);
}

/*
 *
 * ReadSmbusByteData - read a single SPD byte from any offset
 *
 */

STATIC
AGESA_STATUS
ReadSmbusByteData (
  IN UINT16 Iobase,
  IN UINT8  Address,
  OUT UINT8 *Buffer,
  IN UINTN  Offset
  )
{
   UINTN  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
AGESA_STATUS
ReadSmbusByte (
  IN UINT16 Iobase,
  IN UINT8  Address,
  OUT UINT8 *Buffer
  )
{
  UINTN   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
AGESA_STATUS
ReadSpd (
  IN UINT16 IoBase,
  IN UINT8  SmbusSlaveAddress,
  OUT UINT8 *Buffer,
  IN UINTN  Count
  )
{
  UINTN Index, Status;

  /* read the first byte using offset zero */
  Status = ReadSmbusByteData (IoBase, SmbusSlaveAddress, Buffer, 0);
  if (Status) return Status;

  /* read the remaining bytes using auto-increment for speed */
  for (Index = 1; Index < Count; Index++){
    Status = ReadSmbusByte (IoBase, SmbusSlaveAddress, &Buffer [Index]);
    if (Status) return Status;
  }
  return 0;
}

AGESA_STATUS
AmdMemoryReadSPD (
  IN UINT32 Func,
  IN UINT32 Data,
  IN OUT AGESA_READ_SPD_PARAMS *SpdData
  )
{
   UINT8  SmBusAddress = 0;
   UINTN  Index;
   UINTN  MaxSocket = DIMENSION (SpdAddrLookup);
   for (Index = 0; Index < MaxSocket; Index ++){
     if ((SpdData->SocketId     == SpdAddrLookup[Index].SocketId)     &&
         (SpdData->MemChannelId == SpdAddrLookup[Index].MemChannelId) &&
         (SpdData->DimmId       == SpdAddrLookup[Index].DimmId)) {
        SmBusAddress = SpdAddrLookup[Index].SmbusAddress;
        break;
      }
   }


   if (SmBusAddress == 0) return AGESA_ERROR;
   SetupFch (SMBUS_BASE_ADDR);
   return ReadSpd (SMBUS_BASE_ADDR, SmBusAddress, SpdData->Buffer, 128);
}