1 | /** |
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2 | * @file |
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3 | * |
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4 | * @ingroup mpc55xx_dspi |
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5 | * |
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6 | * @brief Header file for the LibI2C bus driver for the Deserial Serial Peripheral Interface (DSPI). |
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7 | */ |
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8 | |
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9 | /* |
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10 | * Copyright (c) 2008 |
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11 | * Embedded Brains GmbH |
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12 | * Obere Lagerstr. 30 |
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13 | * D-82178 Puchheim |
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14 | * Germany |
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15 | * rtems@embedded-brains.de |
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16 | * |
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17 | * The license and distribution terms for this file may be found in the file |
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18 | * LICENSE in this distribution or at http://www.rtems.com/license/LICENSE. |
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19 | */ |
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20 | |
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21 | /** |
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22 | * @defgroup mpc55xx_dspi Deserial Serial Peripheral Interface (DSPI) |
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23 | * |
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24 | * @ingroup mpc55xx |
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25 | */ |
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26 | |
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27 | #ifndef LIBCPU_POWERPC_MPC55XX_DSPI_H |
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28 | #define LIBCPU_POWERPC_MPC55XX_DSPI_H |
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29 | |
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30 | #include <rtems/libi2c.h> |
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31 | |
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32 | #ifdef __cplusplus |
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33 | extern "C" { |
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34 | #endif /* __cplusplus */ |
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35 | |
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36 | struct DSPI_tag; |
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37 | |
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38 | /** |
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39 | * @brief LibI2C bus driver entry. |
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40 | */ |
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41 | typedef struct { |
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42 | /** |
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43 | * @brief Standard bus driver fields. |
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44 | */ |
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45 | rtems_libi2c_bus_t bus; |
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46 | |
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47 | /** |
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48 | * @brief Index in the bus table: @ref mpc55xx_dspi_bus_table. |
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49 | */ |
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50 | unsigned table_index; |
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51 | |
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52 | /** |
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53 | * @brief Bus number (available after rtems_libi2c_register_bus()). |
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54 | * |
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55 | * @note You must set it in the initialization code after the bus registration. |
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56 | */ |
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57 | unsigned bus_number; |
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58 | |
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59 | /** |
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60 | * @brief Hardware registers. |
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61 | */ |
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62 | volatile struct DSPI_tag *regs; |
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63 | |
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64 | /** |
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65 | * @brief Selects SPI master or slave mode. |
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66 | */ |
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67 | int master; |
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68 | |
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69 | /** |
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70 | * @brief Data for the Push Register. |
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71 | */ |
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72 | union DSPI_PUSHR_tag push_data; |
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73 | |
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74 | /** |
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75 | * @brief eDMA channel for transmission. |
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76 | * |
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77 | * The channel is fixed to particular DSPI. |
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78 | */ |
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79 | int edma_channel_transmit; |
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80 | |
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81 | /** |
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82 | * @brief eDMA channel to generate the push data. |
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83 | * |
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84 | * You can choose any available channel. |
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85 | */ |
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86 | int edma_channel_push; |
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87 | |
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88 | /** |
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89 | * @brief eDMA channel for receiving. |
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90 | * |
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91 | * The channel is fixed to particular DSPI. |
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92 | */ |
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93 | int edma_channel_receive; |
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94 | |
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95 | /** |
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96 | * @brief Semaphore ID for a transmit update. |
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97 | */ |
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98 | rtems_id edma_channel_transmit_update; |
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99 | |
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100 | /** |
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101 | * @brief Semaphore ID for a receive update. |
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102 | */ |
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103 | rtems_id edma_channel_receive_update; |
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104 | |
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105 | /** |
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106 | * @brief Transmit error status. |
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107 | */ |
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108 | uint32_t edma_channel_transmit_error; |
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109 | |
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110 | /** |
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111 | * @brief Receive error status. |
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112 | */ |
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113 | uint32_t edma_channel_receive_error; |
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114 | |
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115 | /** |
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116 | * @brief Idle character transmitted in read only mode. |
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117 | */ |
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118 | uint32_t idle_char; |
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119 | } mpc55xx_dspi_bus_entry; |
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120 | |
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121 | /** |
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122 | * @brief Number of DSPIs. |
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123 | */ |
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124 | #define MPC55XX_DSPI_NUMBER 4 |
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125 | |
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126 | /** |
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127 | * @brief Table with bus driver entries. |
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128 | */ |
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129 | extern mpc55xx_dspi_bus_entry mpc55xx_dspi_bus_table [ /* MPC55XX_DSPI_NUMBER */ ]; |
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130 | |
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131 | #ifdef __cplusplus |
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132 | } |
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133 | #endif /* __cplusplus */ |
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134 | |
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135 | #endif /* LIBCPU_POWERPC_MPC55XX_DSPI_H */ |
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