root/drivers/memory/jedec_ddr.h

INCLUDED FROM

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Definitions for DDR memories based on JEDEC specs
   4  *
   5  * Copyright (C) 2012 Texas Instruments, Inc.
   6  *
   7  * Aneesh V <aneesh@ti.com>
   8  */
   9 #ifndef __JEDEC_DDR_H
  10 #define __JEDEC_DDR_H
  11 
  12 #include <linux/types.h>
  13 
  14 /* DDR Densities */
  15 #define DDR_DENSITY_64Mb        1
  16 #define DDR_DENSITY_128Mb       2
  17 #define DDR_DENSITY_256Mb       3
  18 #define DDR_DENSITY_512Mb       4
  19 #define DDR_DENSITY_1Gb         5
  20 #define DDR_DENSITY_2Gb         6
  21 #define DDR_DENSITY_4Gb         7
  22 #define DDR_DENSITY_8Gb         8
  23 #define DDR_DENSITY_16Gb        9
  24 #define DDR_DENSITY_32Gb        10
  25 
  26 /* DDR type */
  27 #define DDR_TYPE_DDR2           1
  28 #define DDR_TYPE_DDR3           2
  29 #define DDR_TYPE_LPDDR2_S4      3
  30 #define DDR_TYPE_LPDDR2_S2      4
  31 #define DDR_TYPE_LPDDR2_NVM     5
  32 
  33 /* DDR IO width */
  34 #define DDR_IO_WIDTH_4          1
  35 #define DDR_IO_WIDTH_8          2
  36 #define DDR_IO_WIDTH_16         3
  37 #define DDR_IO_WIDTH_32         4
  38 
  39 /* Number of Row bits */
  40 #define R9                      9
  41 #define R10                     10
  42 #define R11                     11
  43 #define R12                     12
  44 #define R13                     13
  45 #define R14                     14
  46 #define R15                     15
  47 #define R16                     16
  48 
  49 /* Number of Column bits */
  50 #define C7                      7
  51 #define C8                      8
  52 #define C9                      9
  53 #define C10                     10
  54 #define C11                     11
  55 #define C12                     12
  56 
  57 /* Number of Banks */
  58 #define B1                      0
  59 #define B2                      1
  60 #define B4                      2
  61 #define B8                      3
  62 
  63 /* Refresh rate in nano-seconds */
  64 #define T_REFI_15_6             15600
  65 #define T_REFI_7_8              7800
  66 #define T_REFI_3_9              3900
  67 
  68 /* tRFC values */
  69 #define T_RFC_90                90000
  70 #define T_RFC_110               110000
  71 #define T_RFC_130               130000
  72 #define T_RFC_160               160000
  73 #define T_RFC_210               210000
  74 #define T_RFC_300               300000
  75 #define T_RFC_350               350000
  76 
  77 /* Mode register numbers */
  78 #define DDR_MR0                 0
  79 #define DDR_MR1                 1
  80 #define DDR_MR2                 2
  81 #define DDR_MR3                 3
  82 #define DDR_MR4                 4
  83 #define DDR_MR5                 5
  84 #define DDR_MR6                 6
  85 #define DDR_MR7                 7
  86 #define DDR_MR8                 8
  87 #define DDR_MR9                 9
  88 #define DDR_MR10                10
  89 #define DDR_MR11                11
  90 #define DDR_MR16                16
  91 #define DDR_MR17                17
  92 #define DDR_MR18                18
  93 
  94 /*
  95  * LPDDR2 related defines
  96  */
  97 
  98 /* MR4 register fields */
  99 #define MR4_SDRAM_REF_RATE_SHIFT                        0
 100 #define MR4_SDRAM_REF_RATE_MASK                         7
 101 #define MR4_TUF_SHIFT                                   7
 102 #define MR4_TUF_MASK                                    (1 << 7)
 103 
 104 /* MR4 SDRAM Refresh Rate field values */
 105 #define SDRAM_TEMP_NOMINAL                              0x3
 106 #define SDRAM_TEMP_RESERVED_4                           0x4
 107 #define SDRAM_TEMP_HIGH_DERATE_REFRESH                  0x5
 108 #define SDRAM_TEMP_HIGH_DERATE_REFRESH_AND_TIMINGS      0x6
 109 #define SDRAM_TEMP_VERY_HIGH_SHUTDOWN                   0x7
 110 
 111 #define NUM_DDR_ADDR_TABLE_ENTRIES                      11
 112 #define NUM_DDR_TIMING_TABLE_ENTRIES                    4
 113 
 114 /* Structure for DDR addressing info from the JEDEC spec */
 115 struct lpddr2_addressing {
 116         u32 num_banks;
 117         u32 tREFI_ns;
 118         u32 tRFCab_ps;
 119 };
 120 
 121 /*
 122  * Structure for timings from the LPDDR2 datasheet
 123  * All parameters are in pico seconds(ps) unless explicitly indicated
 124  * with a suffix like tRAS_max_ns below
 125  */
 126 struct lpddr2_timings {
 127         u32 max_freq;
 128         u32 min_freq;
 129         u32 tRPab;
 130         u32 tRCD;
 131         u32 tWR;
 132         u32 tRAS_min;
 133         u32 tRRD;
 134         u32 tWTR;
 135         u32 tXP;
 136         u32 tRTP;
 137         u32 tCKESR;
 138         u32 tDQSCK_max;
 139         u32 tDQSCK_max_derated;
 140         u32 tFAW;
 141         u32 tZQCS;
 142         u32 tZQCL;
 143         u32 tZQinit;
 144         u32 tRAS_max_ns;
 145 };
 146 
 147 /*
 148  * Min value for some parameters in terms of number of tCK cycles(nCK)
 149  * Please set to zero parameters that are not valid for a given memory
 150  * type
 151  */
 152 struct lpddr2_min_tck {
 153         u32 tRPab;
 154         u32 tRCD;
 155         u32 tWR;
 156         u32 tRASmin;
 157         u32 tRRD;
 158         u32 tWTR;
 159         u32 tXP;
 160         u32 tRTP;
 161         u32 tCKE;
 162         u32 tCKESR;
 163         u32 tFAW;
 164 };
 165 
 166 extern const struct lpddr2_addressing
 167         lpddr2_jedec_addressing_table[NUM_DDR_ADDR_TABLE_ENTRIES];
 168 extern const struct lpddr2_timings
 169         lpddr2_jedec_timings[NUM_DDR_TIMING_TABLE_ENTRIES];
 170 extern const struct lpddr2_min_tck lpddr2_jedec_min_tck;
 171 
 172 #endif /* __JEDEC_DDR_H */