1 | /* |
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2 | * Copyright (c) 2016 embedded brains GmbH. All rights reserved. |
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3 | * |
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4 | * embedded brains GmbH |
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5 | * Dornierstr. 4 |
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6 | * 82178 Puchheim |
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7 | * Germany |
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8 | * <rtems@embedded-brains.de> |
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9 | * |
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10 | * The license and distribution terms for this file may be |
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11 | * found in the file LICENSE in this distribution or at |
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12 | * http://www.rtems.org/license/LICENSE. |
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13 | */ |
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14 | |
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15 | #include <bspopts.h> |
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16 | #include <chip.h> |
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17 | #include <include/board_memories.h> |
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18 | |
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19 | #if defined ATSAM_SDRAM_IS42S16100E_7BLI |
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20 | |
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21 | #if ATSAM_MCK != 123000000 |
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22 | #error Please check SDRAM settings for this clock frequency. |
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23 | #endif |
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24 | |
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25 | const struct BOARD_Sdram_Config BOARD_Sdram_Config = { |
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26 | /* FIXME: a lot of these values should be calculated using CPU frequency */ |
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27 | .sdramc_tr = 1562, |
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28 | .sdramc_cr = |
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29 | SDRAMC_CR_NC_COL8 /* 8 column bits */ |
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30 | | SDRAMC_CR_NR_ROW11 /* 12 row bits (4K) */ |
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31 | | SDRAMC_CR_CAS_LATENCY3 /* CAS Latency 3 */ |
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32 | | SDRAMC_CR_NB_BANK2 /* 2 banks */ |
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33 | | SDRAMC_CR_DBW /* 16 bit */ |
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34 | | SDRAMC_CR_TWR(5) |
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35 | | SDRAMC_CR_TRC_TRFC(13) /* 63ns min */ |
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36 | | SDRAMC_CR_TRP(5) /* Command period (PRE to ACT) 21 ns min */ |
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37 | | SDRAMC_CR_TRCD(5) /* Active Command to R/W Cmd delay time 21ns min */ |
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38 | | SDRAMC_CR_TRAS(9) /* Command period (ACT to PRE) 42ns min */ |
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39 | | SDRAMC_CR_TXSR(15U), /* Exit self-refresh to active time 70ns Min */ |
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40 | .sdramc_mdr = SDRAMC_MDR_MD_SDRAM, |
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41 | .sdramc_cfr1 = SDRAMC_CFR1_UNAL_SUPPORTED | SDRAMC_CFR1_TMRD(2) |
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42 | }; |
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43 | |
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44 | #elif defined ATSAM_SDRAM_IS42S16320F_7BL |
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45 | |
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46 | #if ATSAM_MCK != 123000000 |
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47 | #error Please check SDRAM settings for this clock frequency. |
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48 | #endif |
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49 | |
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50 | #define CLOCK_CYCLES_FROM_NS_MAX(ns) \ |
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51 | (((ns) * (ATSAM_MCK / 1000ul / 1000ul)) / 1000ul) |
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52 | #define CLOCK_CYCLES_FROM_NS_MIN(ns) (CLOCK_CYCLES_FROM_NS_MAX(ns) + 1) |
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53 | |
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54 | const struct BOARD_Sdram_Config BOARD_Sdram_Config = { |
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55 | /* 8k refresh cycles every 64ms => 7.8125us */ |
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56 | .sdramc_tr = CLOCK_CYCLES_FROM_NS_MAX(7812ul), |
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57 | .sdramc_cr = |
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58 | SDRAMC_CR_NC_COL10 |
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59 | | SDRAMC_CR_NR_ROW13 |
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60 | | SDRAMC_CR_CAS_LATENCY3 |
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61 | | SDRAMC_CR_NB_BANK4 |
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62 | | SDRAMC_CR_DBW |
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63 | /* t_WR = 30ns min (t_RC - t_RP - t_RCD; |
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64 | * see data sheet November 2015 page 55); |
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65 | * add some security margin */ |
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66 | | SDRAMC_CR_TWR(CLOCK_CYCLES_FROM_NS_MIN(40)) |
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67 | | SDRAMC_CR_TRC_TRFC(CLOCK_CYCLES_FROM_NS_MIN(60)) |
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68 | | SDRAMC_CR_TRP(CLOCK_CYCLES_FROM_NS_MIN(15)) |
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69 | | SDRAMC_CR_TRCD(CLOCK_CYCLES_FROM_NS_MIN(15)) |
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70 | | SDRAMC_CR_TRAS(CLOCK_CYCLES_FROM_NS_MIN(37)) |
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71 | | SDRAMC_CR_TXSR(CLOCK_CYCLES_FROM_NS_MIN(67)), |
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72 | .sdramc_mdr = SDRAMC_MDR_MD_SDRAM, |
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73 | .sdramc_cfr1 = SDRAMC_CFR1_UNAL_SUPPORTED | |
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74 | SDRAMC_CFR1_TMRD(CLOCK_CYCLES_FROM_NS_MIN(14)) |
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75 | }; |
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76 | |
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77 | #elif defined ATSAM_SDRAM_MT48LC16M16A2P_6A |
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78 | |
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79 | /* |
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80 | * Refresh: 7.81 us |
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81 | * TWR: 12 ns |
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82 | * TRC_TRFC: 60 ns |
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83 | * TRP: 15 ns |
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84 | * TRCD: 18 ns |
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85 | * TRAS: 42 ns |
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86 | * TXSR: 67 ns |
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87 | * TMRD: 2 clock cycles |
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88 | */ |
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89 | |
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90 | #if ATSAM_MCK == 60000000 |
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91 | const struct BOARD_Sdram_Config BOARD_Sdram_Config = { |
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92 | .sdramc_tr = 0x1D4, |
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93 | .sdramc_cr = |
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94 | SDRAMC_CR_NC_COL9 |
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95 | | SDRAMC_CR_NR_ROW13 |
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96 | | SDRAMC_CR_NB_BANK4 |
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97 | | SDRAMC_CR_CAS_LATENCY3 |
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98 | | SDRAMC_CR_DBW |
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99 | | SDRAMC_CR_TWR(3) |
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100 | | SDRAMC_CR_TRC_TRFC(8) |
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101 | | SDRAMC_CR_TRP(3) |
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102 | | SDRAMC_CR_TRCD(3) |
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103 | | SDRAMC_CR_TRAS(5) |
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104 | | SDRAMC_CR_TXSR(9), |
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105 | .sdramc_mdr = SDRAMC_MDR_MD_SDRAM, |
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106 | .sdramc_cfr1 = SDRAMC_CFR1_UNAL_SUPPORTED | |
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107 | SDRAMC_CFR1_TMRD(2) |
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108 | }; |
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109 | |
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110 | #elif ATSAM_MCK == 123000000 |
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111 | const struct BOARD_Sdram_Config BOARD_Sdram_Config = { |
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112 | .sdramc_tr = 960, |
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113 | .sdramc_cr = |
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114 | SDRAMC_CR_NC_COL9 |
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115 | | SDRAMC_CR_NR_ROW13 |
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116 | | SDRAMC_CR_NB_BANK4 |
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117 | | SDRAMC_CR_CAS_LATENCY3 |
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118 | | SDRAMC_CR_DBW |
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119 | | SDRAMC_CR_TWR(2) |
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120 | | SDRAMC_CR_TRC_TRFC(8) |
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121 | | SDRAMC_CR_TRP(2) |
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122 | | SDRAMC_CR_TRCD(3) |
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123 | | SDRAMC_CR_TRAS(6) |
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124 | | SDRAMC_CR_TXSR(9), |
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125 | .sdramc_mdr = SDRAMC_MDR_MD_SDRAM, |
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126 | .sdramc_cfr1 = SDRAMC_CFR1_UNAL_SUPPORTED | |
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127 | SDRAMC_CFR1_TMRD(2) |
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128 | }; |
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129 | |
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130 | #else /* ATSAM_MCK unknown */ |
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131 | #error Please check SDRAM settings for this frequency. |
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132 | #endif |
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133 | |
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134 | #else |
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135 | #error SDRAM not supported. |
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136 | #endif |
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