aboutsummaryrefslogtreecommitdiffstats
path: root/include/memory/jedec_ddr.h
blob: ddad0f870e5d38375f9ba550cb05d37f42142459 (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
/*
 * Definitions for DDR memories based on JEDEC specs
 *
 * Copyright (C) 2012 Texas Instruments, Inc.
 *
 * Aneesh V <aneesh@ti.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#ifndef __LINUX_JEDEC_DDR_H
#define __LINUX_JEDEC_DDR_H

#include <linux/types.h>

/* DDR Densities */
#define DDR_DENSITY_64Mb	1
#define DDR_DENSITY_128Mb	2
#define DDR_DENSITY_256Mb	3
#define DDR_DENSITY_512Mb	4
#define DDR_DENSITY_1Gb		5
#define DDR_DENSITY_2Gb		6
#define DDR_DENSITY_4Gb		7
#define DDR_DENSITY_8Gb		8
#define DDR_DENSITY_16Gb	9
#define DDR_DENSITY_32Gb	10

/* DDR type */
#define DDR_TYPE_DDR2		1
#define DDR_TYPE_DDR3		2
#define DDR_TYPE_LPDDR2_S4	3
#define DDR_TYPE_LPDDR2_S2	4
#define DDR_TYPE_LPDDR2_NVM	5

/* DDR IO width */
#define DDR_IO_WIDTH_4		1
#define DDR_IO_WIDTH_8		2
#define DDR_IO_WIDTH_16		3
#define DDR_IO_WIDTH_32		4

/* Number of Row bits */
#define R9			9
#define R10			10
#define R11			11
#define R12			12
#define R13			13
#define R14			14
#define R15			15
#define R16			16

/* Number of Column bits */
#define C7			7
#define C8			8
#define C9			9
#define C10			10
#define C11			11
#define C12			12

/* Number of Banks */
#define B1			0
#define B2			1
#define B4			2
#define B8			3

/* Refresh rate in nano-seconds */
#define T_REFI_15_6		15600
#define T_REFI_7_8		7800
#define T_REFI_3_9		3900

/* tRFC values */
#define T_RFC_90		90000
#define T_RFC_110		110000
#define T_RFC_130		130000
#define T_RFC_160		160000
#define T_RFC_210		210000
#define T_RFC_300		300000
#define T_RFC_350		350000

/* Mode register numbers */
#define DDR_MR0			0
#define DDR_MR1			1
#define DDR_MR2			2
#define DDR_MR3			3
#define DDR_MR4			4
#define DDR_MR5			5
#define DDR_MR6			6
#define DDR_MR7			7
#define DDR_MR8			8
#define DDR_MR9			9
#define DDR_MR10		10
#define DDR_MR11		11
#define DDR_MR16		16
#define DDR_MR17		17
#define DDR_MR18		18

/*
 * LPDDR2 related defines
 */

/* MR4 register fields */
#define MR4_SDRAM_REF_RATE_SHIFT			0
#define MR4_SDRAM_REF_RATE_MASK				7
#define MR4_TUF_SHIFT					7
#define MR4_TUF_MASK					(1 << 7)

/* MR4 SDRAM Refresh Rate field values */
#define SDRAM_TEMP_NOMINAL				0x3
#define SDRAM_TEMP_RESERVED_4				0x4
#define SDRAM_TEMP_HIGH_DERATE_REFRESH			0x5
#define SDRAM_TEMP_HIGH_DERATE_REFRESH_AND_TIMINGS	0x6
#define SDRAM_TEMP_VERY_HIGH_SHUTDOWN			0x7

#define NUM_DDR_ADDR_TABLE_ENTRIES			11
#define NUM_DDR_TIMING_TABLE_ENTRIES			4

/* Structure for DDR addressing info from the JEDEC spec */
struct lpddr2_addressing {
	u32 num_banks;
	u32 tREFI_ns;
	u32 tRFCab_ps;
};

/*
 * Structure for timings from the LPDDR2 datasheet
 * All parameters are in pico seconds(ps) unless explicitly indicated
 * with a suffix like tRAS_max_ns below
 */
struct lpddr2_timings {
	u32 max_freq;
	u32 min_freq;
	u32 tRPab;
	u32 tRCD;
	u32 tWR;
	u32 tRAS_min;
	u32 tRRD;
	u32 tWTR;
	u32 tXP;
	u32 tRTP;
	u32 tCKESR;
	u32 tDQSCK_max;
	u32 tDQSCK_max_derated;
	u32 tFAW;
	u32 tZQCS;
	u32 tZQCL;
	u32 tZQinit;
	u32 tRAS_max_ns;
};

/*
 * Min value for some parameters in terms of number of tCK cycles(nCK)
 * Please set to zero parameters that are not valid for a given memory
 * type
 */
struct lpddr2_min_tck {
	u32 tRPab;
	u32 tRCD;
	u32 tWR;
	u32 tRASmin;
	u32 tRRD;
	u32 tWTR;
	u32 tXP;
	u32 tRTP;
	u32 tCKE;
	u32 tCKESR;
	u32 tFAW;
};

extern const struct lpddr2_addressing
	lpddr2_jedec_addressing_table[NUM_DDR_ADDR_TABLE_ENTRIES];
extern const struct lpddr2_timings
	lpddr2_jedec_timings[NUM_DDR_TIMING_TABLE_ENTRIES];
extern const struct lpddr2_min_tck lpddr2_jedec_min_tck;

#endif /* __LINUX_JEDEC_DDR_H */

Privacy Policy