1 | /** |
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2 | * @file |
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3 | * |
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4 | * @ingroup arm_beagle |
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5 | * |
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6 | * @brief SPI support API. |
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7 | * |
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8 | * Based on bsps/m68k/gen68360/spi/m360_spi.h |
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9 | */ |
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10 | |
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11 | /* |
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12 | * Copyright (c) 2018 Pierre-Louis Garnier <garnie_a@epita.fr> |
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13 | * |
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14 | * The license and distribution terms for this file may be |
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15 | * found in the file LICENSE in this distribution or at |
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16 | * http://www.rtems.org/license/LICENSE. |
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17 | */ |
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18 | |
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19 | #ifndef LIBBSP_ARM_BEAGLE_SPI_H |
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20 | #define LIBBSP_ARM_BEAGLE_SPI_H |
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21 | |
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22 | #include <bsp.h> |
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23 | #include <rtems/libi2c.h> |
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24 | #include <rtems/irq.h> |
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25 | |
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26 | #ifdef __cplusplus |
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27 | extern "C" { |
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28 | #endif /* __cplusplus */ |
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29 | |
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30 | #define BBB_SPI_TIMEOUT 1000 |
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31 | |
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32 | #define BBB_SPI_0_BUS_PATH "/dev/spi-0" |
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33 | |
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34 | #define BBB_SPI_0_IRQ AM335X_INT_SPI0INT |
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35 | |
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36 | typedef enum { |
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37 | SPI0, |
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38 | SPI1, |
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39 | SPI_COUNT |
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40 | } bbb_spi_id_t; |
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41 | |
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42 | |
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43 | |
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44 | typedef struct BEAGLE_SPI_BufferDescriptor_ { |
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45 | unsigned short status; |
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46 | unsigned short length; |
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47 | volatile void *buffer; |
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48 | } BEAGLE_SPI_BufferDescriptor_t; |
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49 | |
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50 | typedef struct beagle_spi_softc { |
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51 | int initialized; |
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52 | rtems_id task_id; |
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53 | uintptr_t regs_base; |
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54 | rtems_vector_number irq; |
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55 | } beagle_spi_softc_t; |
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56 | |
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57 | typedef struct { |
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58 | rtems_libi2c_bus_t bus_desc; |
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59 | beagle_spi_softc_t softc; |
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60 | } beagle_spi_desc_t; |
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61 | |
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62 | /* |
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63 | * Initialize the driver |
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64 | * |
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65 | * Returns: o = ok or error code |
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66 | */ |
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67 | rtems_status_code beagle_spi_init |
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68 | ( |
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69 | rtems_libi2c_bus_t *bh /* bus specifier structure */ |
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70 | ); |
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71 | |
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72 | /* |
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73 | * Receive some bytes from SPI device |
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74 | * |
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75 | * Returns: number of bytes received or (negative) error code |
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76 | */ |
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77 | int beagle_spi_read_bytes |
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78 | ( |
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79 | rtems_libi2c_bus_t *bh, /* bus specifier structure */ |
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80 | unsigned char *buf, /* buffer to store bytes */ |
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81 | int len /* number of bytes to receive */ |
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82 | ); |
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83 | |
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84 | /* |
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85 | * Send some bytes to SPI device |
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86 | * |
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87 | * Returns: number of bytes sent or (negative) error code |
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88 | */ |
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89 | int beagle_spi_write_bytes |
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90 | ( |
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91 | rtems_libi2c_bus_t *bh, /* bus specifier structure */ |
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92 | unsigned char *buf, /* buffer to send */ |
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93 | int len /* number of bytes to send */ |
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94 | ); |
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95 | |
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96 | /* |
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97 | * Set SPI to desired baudrate/clock mode/character mode |
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98 | * |
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99 | * Returns: rtems_status_code |
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100 | */ |
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101 | rtems_status_code beagle_spi_set_tfr_mode |
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102 | ( |
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103 | rtems_libi2c_bus_t *bh, /* bus specifier structure */ |
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104 | const rtems_libi2c_tfr_mode_t *tfr_mode /* transfer mode info */ |
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105 | ); |
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106 | |
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107 | /* |
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108 | * Perform selected ioctl function for SPI |
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109 | * |
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110 | * Returns: rtems_status_code |
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111 | */ |
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112 | int beagle_spi_ioctl |
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113 | ( |
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114 | rtems_libi2c_bus_t *bh, /* bus specifier structure */ |
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115 | int cmd, /* ioctl command code */ |
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116 | void *arg /* additional argument array */ |
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117 | ); |
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118 | |
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119 | /* |
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120 | * Register SPI bus and devices |
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121 | * |
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122 | * Returns: Bus number or error code |
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123 | */ |
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124 | rtems_status_code bsp_register_spi |
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125 | ( |
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126 | const char *bus_path, |
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127 | uintptr_t register_base, |
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128 | rtems_vector_number irq |
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129 | ); |
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130 | |
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131 | static inline rtems_status_code bbb_register_spi_0(void) |
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132 | { |
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133 | return bsp_register_spi( |
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134 | BBB_SPI_0_BUS_PATH, |
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135 | AM335X_SPI0_BASE, |
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136 | BBB_SPI_0_IRQ |
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137 | ); |
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138 | } |
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139 | |
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140 | #ifdef __cplusplus |
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141 | } |
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142 | #endif /* __cplusplus */ |
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143 | |
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144 | #endif /* LIBBSP_ARM_BEAGLE_SPI_H */ |
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