1 | /** |
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2 | * @file |
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3 | * |
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4 | * @ingroup raspberrypi_interrupt |
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5 | * |
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6 | * @brief Interrupt support. |
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7 | */ |
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8 | |
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9 | /* |
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10 | * Copyright (c) 2009 |
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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 |
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18 | * found in the file LICENSE in this distribution or at |
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19 | * http://www.rtems.org/license/LICENSE. |
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20 | */ |
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21 | |
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22 | #include <rtems/score/armv4.h> |
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23 | |
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24 | #include <bsp.h> |
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25 | #include <bsp/irq.h> |
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26 | #include <bsp/irq-generic.h> |
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27 | #include <bsp/raspberrypi.h> |
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28 | #include <bsp/linker-symbols.h> |
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29 | #include <bsp/mmu.h> |
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30 | |
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31 | /* |
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32 | ** This sets the main exception vectors |
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33 | */ |
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34 | void raspberrypi_set_exception_handler( |
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35 | Arm_symbolic_exception_name exception, |
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36 | void (*handler)(void) |
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37 | ) |
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38 | { |
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39 | if ((unsigned) exception < MAX_EXCEPTIONS) |
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40 | { |
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41 | uint32_t *table = (uint32_t *) bsp_section_vector_begin + MAX_EXCEPTIONS; |
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42 | table [exception] = (uint32_t) handler; |
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43 | |
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44 | } |
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45 | } |
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46 | |
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47 | /* |
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48 | ** Determine the source of the interrupt and dispatch the correct handler. |
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49 | */ |
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50 | void bsp_interrupt_dispatch(void) |
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51 | { |
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52 | rtems_vector_number vector = 255; |
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53 | |
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54 | /* ARM timer */ |
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55 | if (BCM2835_REG(BCM2835_IRQ_BASIC) && 0x1) |
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56 | { |
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57 | vector = BCM2835_IRQ_ID_TIMER_0; |
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58 | |
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59 | } |
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60 | /* UART 0 */ |
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61 | else if ( BCM2835_REG(BCM2835_IRQ_BASIC) && BCM2835_BIT(19)) |
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62 | { |
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63 | vector = BCM2835_IRQ_ID_UART; |
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64 | } |
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65 | |
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66 | if ( vector < 255 ) |
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67 | { |
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68 | bsp_interrupt_handler_dispatch(vector); |
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69 | } |
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70 | |
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71 | } |
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72 | |
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73 | rtems_status_code bsp_interrupt_vector_enable(rtems_vector_number vector) |
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74 | { |
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75 | rtems_interrupt_level level; |
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76 | |
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77 | rtems_interrupt_disable(level); |
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78 | |
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79 | /* ARM Timer */ |
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80 | if ( vector == BCM2835_IRQ_ID_TIMER_0 ) |
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81 | { |
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82 | BCM2835_REG(BCM2835_IRQ_ENABLE_BASIC) = 0x1; |
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83 | } |
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84 | /* UART 0 */ |
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85 | else if ( vector == BCM2835_IRQ_ID_UART ) |
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86 | { |
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87 | BCM2835_REG(BCM2835_IRQ_ENABLE2) = BCM2835_BIT(25); |
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88 | |
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89 | } |
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90 | rtems_interrupt_enable(level); |
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91 | |
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92 | return RTEMS_SUCCESSFUL; |
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93 | } |
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94 | |
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95 | rtems_status_code bsp_interrupt_vector_disable(rtems_vector_number vector) |
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96 | { |
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97 | rtems_interrupt_level level; |
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98 | |
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99 | rtems_interrupt_disable(level); |
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100 | |
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101 | if ( vector == BCM2835_IRQ_ID_TIMER_0 ) |
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102 | { |
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103 | BCM2835_REG(BCM2835_IRQ_DISABLE_BASIC) = 0x1; |
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104 | } |
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105 | else if ( vector == BCM2835_IRQ_ID_UART ) |
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106 | { |
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107 | BCM2835_REG(BCM2835_IRQ_DISABLE2) = BCM2835_BIT(25); |
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108 | } |
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109 | rtems_interrupt_enable(level); |
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110 | |
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111 | return RTEMS_SUCCESSFUL; |
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112 | } |
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113 | |
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114 | |
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115 | void bsp_interrupt_handler_default(rtems_vector_number vector) |
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116 | { |
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117 | printk("spurious interrupt: %u\n", vector); |
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118 | } |
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119 | |
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120 | rtems_status_code bsp_interrupt_facility_initialize(void) |
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121 | { |
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122 | raspberrypi_set_exception_handler(ARM_EXCEPTION_IRQ, _ARMV4_Exception_interrupt); |
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123 | return RTEMS_SUCCESSFUL; |
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124 | } |
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