linux/include/memory/jedec_ddr.h
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   1/*
   2 * Definitions for DDR memories based on JEDEC specs
   3 *
   4 * Copyright (C) 2012 Texas Instruments, Inc.
   5 *
   6 * Aneesh V <aneesh@ti.com>
   7 *
   8 * This program is free software; you can redistribute it and/or modify
   9 * it under the terms of the GNU General Public License version 2 as
  10 * published by the Free Software Foundation.
  11 */
  12#ifndef __LINUX_JEDEC_DDR_H
  13#define __LINUX_JEDEC_DDR_H
  14
  15#include <linux/types.h>
  16
  17/* DDR Densities */
  18#define DDR_DENSITY_64Mb        1
  19#define DDR_DENSITY_128Mb       2
  20#define DDR_DENSITY_256Mb       3
  21#define DDR_DENSITY_512Mb       4
  22#define DDR_DENSITY_1Gb         5
  23#define DDR_DENSITY_2Gb         6
  24#define DDR_DENSITY_4Gb         7
  25#define DDR_DENSITY_8Gb         8
  26#define DDR_DENSITY_16Gb        9
  27#define DDR_DENSITY_32Gb        10
  28
  29/* DDR type */
  30#define DDR_TYPE_DDR2           1
  31#define DDR_TYPE_DDR3           2
  32#define DDR_TYPE_LPDDR2_S4      3
  33#define DDR_TYPE_LPDDR2_S2      4
  34#define DDR_TYPE_LPDDR2_NVM     5
  35
  36/* DDR IO width */
  37#define DDR_IO_WIDTH_4          1
  38#define DDR_IO_WIDTH_8          2
  39#define DDR_IO_WIDTH_16         3
  40#define DDR_IO_WIDTH_32         4
  41
  42/* Number of Row bits */
  43#define R9                      9
  44#define R10                     10
  45#define R11                     11
  46#define R12                     12
  47#define R13                     13
  48#define R14                     14
  49#define R15                     15
  50#define R16                     16
  51
  52/* Number of Column bits */
  53#define C7                      7
  54#define C8                      8
  55#define C9                      9
  56#define C10                     10
  57#define C11                     11
  58#define C12                     12
  59
  60/* Number of Banks */
  61#define B1                      0
  62#define B2                      1
  63#define B4                      2
  64#define B8                      3
  65
  66/* Refresh rate in nano-seconds */
  67#define T_REFI_15_6             15600
  68#define T_REFI_7_8              7800
  69#define T_REFI_3_9              3900
  70
  71/* tRFC values */
  72#define T_RFC_90                90000
  73#define T_RFC_110               110000
  74#define T_RFC_130               130000
  75#define T_RFC_160               160000
  76#define T_RFC_210               210000
  77#define T_RFC_300               300000
  78#define T_RFC_350               350000
  79
  80/* Mode register numbers */
  81#define DDR_MR0                 0
  82#define DDR_MR1                 1
  83#define DDR_MR2                 2
  84#define DDR_MR3                 3
  85#define DDR_MR4                 4
  86#define DDR_MR5                 5
  87#define DDR_MR6                 6
  88#define DDR_MR7                 7
  89#define DDR_MR8                 8
  90#define DDR_MR9                 9
  91#define DDR_MR10                10
  92#define DDR_MR11                11
  93#define DDR_MR16                16
  94#define DDR_MR17                17
  95#define DDR_MR18                18
  96
  97/*
  98 * LPDDR2 related defines
  99 */
 100
 101/* MR4 register fields */
 102#define MR4_SDRAM_REF_RATE_SHIFT                        0
 103#define MR4_SDRAM_REF_RATE_MASK                         7
 104#define MR4_TUF_SHIFT                                   7
 105#define MR4_TUF_MASK                                    (1 << 7)
 106
 107/* MR4 SDRAM Refresh Rate field values */
 108#define SDRAM_TEMP_NOMINAL                              0x3
 109#define SDRAM_TEMP_RESERVED_4                           0x4
 110#define SDRAM_TEMP_HIGH_DERATE_REFRESH                  0x5
 111#define SDRAM_TEMP_HIGH_DERATE_REFRESH_AND_TIMINGS      0x6
 112#define SDRAM_TEMP_VERY_HIGH_SHUTDOWN                   0x7
 113
 114#define NUM_DDR_ADDR_TABLE_ENTRIES                      11
 115#define NUM_DDR_TIMING_TABLE_ENTRIES                    4
 116
 117/* Structure for DDR addressing info from the JEDEC spec */
 118struct lpddr2_addressing {
 119        u32 num_banks;
 120        u32 tREFI_ns;
 121        u32 tRFCab_ps;
 122};
 123
 124/*
 125 * Structure for timings from the LPDDR2 datasheet
 126 * All parameters are in pico seconds(ps) unless explicitly indicated
 127 * with a suffix like tRAS_max_ns below
 128 */
 129struct lpddr2_timings {
 130        u32 max_freq;
 131        u32 min_freq;
 132        u32 tRPab;
 133        u32 tRCD;
 134        u32 tWR;
 135        u32 tRAS_min;
 136        u32 tRRD;
 137        u32 tWTR;
 138        u32 tXP;
 139        u32 tRTP;
 140        u32 tCKESR;
 141        u32 tDQSCK_max;
 142        u32 tDQSCK_max_derated;
 143        u32 tFAW;
 144        u32 tZQCS;
 145        u32 tZQCL;
 146        u32 tZQinit;
 147        u32 tRAS_max_ns;
 148};
 149
 150/*
 151 * Min value for some parameters in terms of number of tCK cycles(nCK)
 152 * Please set to zero parameters that are not valid for a given memory
 153 * type
 154 */
 155struct lpddr2_min_tck {
 156        u32 tRPab;
 157        u32 tRCD;
 158        u32 tWR;
 159        u32 tRASmin;
 160        u32 tRRD;
 161        u32 tWTR;
 162        u32 tXP;
 163        u32 tRTP;
 164        u32 tCKE;
 165        u32 tCKESR;
 166        u32 tFAW;
 167};
 168
 169extern const struct lpddr2_addressing
 170        lpddr2_jedec_addressing_table[NUM_DDR_ADDR_TABLE_ENTRIES];
 171extern const struct lpddr2_timings
 172        lpddr2_jedec_timings[NUM_DDR_TIMING_TABLE_ENTRIES];
 173extern const struct lpddr2_min_tck lpddr2_jedec_min_tck;
 174
 175#endif /* __LINUX_JEDEC_DDR_H */
 176
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