summaryrefslogtreecommitdiff
path: root/src/mainboard/asrock/e350m1/dimmSpd.c
blob: 3295bf6589c8303beb9163421ca2a223c5d07683 (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
/*
 * This file is part of the coreboot project.
 *
 * Copyright (C) 2011 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include "Porting.h"
#include "AGESA.h"
#include "amdlib.h"
#include "OEM.h" /* SMBUS0_BASE_ADDRESS */

AGESA_STATUS AmdMemoryReadSPD (UINT32 unused1, UINT32 unused2, AGESA_READ_SPD_PARAMS *info);
#define DIMENSION(array)(sizeof (array)/ sizeof (array [0]))

/*#pragma optimize ("", off) // for source level debug
*---------------------------------------------------------------------------
*
* SPD address table - porting required
*/

static const UINT8 spdAddressLookup [2] [2] [4] =  // socket, channel, dimm
   {
   // socket 0
      {
         {0xA0, 0xA4},  // channel 0 dimms
         {0x00, 0x00},  // channel 1 dimms
      },
   // socket 1
      {
         {0x00, 0x00},  // channel 0 dimms
         {0x00, 0x00},  // channel 1 dimms
      },
   };

/*-----------------------------------------------------------------------------
 *
 * 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;

   /* read the first byte using offset zero */
   error = readSmbusByteData (iobase, SmbusSlaveAddress, buffer, 0);
   if (error) 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) return error;
      }

   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);
   writePmReg (0x29, 0x80);
   writePmReg (0x28, 0x61);
   __outbyte (ioBase + 0x0E, 66000000 / 400000 / 4); // set SMBus clock to 400 KHz
   }

AGESA_STATUS AmdMemoryReadSPD (UINT32 unused1, UINT32 unused2, AGESA_READ_SPD_PARAMS *info)
   {
   int spdAddress, ioBase;

   if (info->SocketId     >= DIMENSION (spdAddressLookup      )) return AGESA_ERROR;
   if (info->MemChannelId >= DIMENSION (spdAddressLookup[0]   )) return AGESA_ERROR;
   if (info->DimmId       >= DIMENSION (spdAddressLookup[0][0])) return AGESA_ERROR;

   spdAddress = spdAddressLookup [info->SocketId] [info->MemChannelId] [info->DimmId];
   if (spdAddress == 0) return AGESA_ERROR;
   ioBase = SMBUS0_BASE_ADDRESS;
   setupFch (ioBase);
   return readspd (ioBase, spdAddress, (void *) info->Buffer, 128);
   }