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
|
/* IBM_PROLOG_BEGIN_TAG */
/* This is an automatically generated prolog. */
/* */
/* $Source: chips/p9/procedures/hwp/memory/p9_mss_freq.H $ */
/* */
/* IBM CONFIDENTIAL */
/* */
/* EKB Project */
/* */
/* COPYRIGHT 2015,2016 */
/* [+] International Business Machines Corp. */
/* */
/* */
/* The source code for this program is not published or otherwise */
/* divested of its trade secrets, irrespective of what has been */
/* deposited with the U.S. Copyright Office. */
/* */
/* IBM_PROLOG_END_TAG */
///
/// @file p9_mss_freq.H
/// @brief Calculate and save off DIMM frequencies
///
// *HWP HWP Owner: Andre Marin <aamarin@us.ibm.com>
// *HWP HWP Backup: Brian Silver <bsilver@us.ibm.com>
// *HWP Team: Memory
// *HWP Level: 2
// *HWP Consumed by: FSP:HB
#ifndef __P9_MSS_FREQ__
#define __P9_MSS_FREQ__
#include <fapi2.H>
namespace mss
{
enum constants : std::uint64_t
{
TAA_MAX_DDR4 = 18000,
TWO_MHZ = 2000000,
DMI_9_6GB = 0x01,
DMI_16_0GB = 0x02,
LR_MIN_DDR4_CL = 7,
LR_MAX_DDR4_CL = 36,
HR_MIN_DDR4_CL = 23,
HR_MAX_DDR4_CL = 52,
};
enum frequencies : std::uint64_t
{
FREQ_2667 = 2667,
FREQ_2400 = 2400,
FREQ_2133 = 2133,
FREQ_1867 = 1867,
FREQ_1600 = 1600,
};
///
/// @brief Calculate frequency
/// @tparam T input
/// @param[in] i_clock T
/// @return T (frequency)
///
template<typename T>
inline T calc_freq(T i_clock)
{
// Casted so compiler performs operations on equivalent data types
T frequency = TWO_MHZ / i_clock;
// Round-up if division leaves remainder
frequency += ( (TWO_MHZ % i_clock) == 0 ? 0 : 1 );
return frequency;
}
///
/// @brief Calculate timing value (e.g.tCK, tAA, etc.)
/// @tparam T input
/// @param[in] i_freq T
/// @return T (timing)
///
template<typename T>
inline T calc_clock (T i_freq)
{
T timing = TWO_MHZ / i_freq;
// Round-up if division leaves remainder
timing += ( (TWO_MHZ % i_freq) == 0 ? 0 : 1 );
return timing;
}
///
/// @brief Calculate CAS latency
/// @tparam[in] T
/// @param[in] tAA_max T,tCKmax T
/// @return T cas_latency
///
template<typename T>
inline T calc_cas_latency(T tAA_max, T tCKmax)
{
T cas_latency = tAA_max / tCKmax;
// Increment if division leaves remainder
cas_latency += ( (tAA_max % tCKmax) == 0 ? 0 : 1 );
return cas_latency;
}
}// mss namespace
typedef fapi2::ReturnCode (*p9_mss_freq_FP_t) (const fapi2::Target<fapi2::TARGET_TYPE_MCS>&);
extern "C"
{
///
/// @brief Calculate and save off DIMM frequencies
/// @param[in] i_target the controller (e.g., MCS)
/// @return FAPI2_RC_SUCCESS iff ok
///
fapi2::ReturnCode p9_mss_freq( const fapi2::Target<fapi2::TARGET_TYPE_MCS>& i_target );
}
#endif
|
