1 | /** |
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2 | * @file |
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3 | * |
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4 | * @ingroup bsp_interrupt |
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5 | * |
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6 | * @brief LPC24XX interrupt support. |
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7 | */ |
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8 | |
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9 | /* |
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10 | * Copyright (c) 2008, 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 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 | #include <bsp.h> |
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22 | #include <bsp/irq.h> |
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23 | #include <bsp/irq-generic.h> |
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24 | #include <bsp/lpc24xx.h> |
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25 | |
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26 | static inline bool lpc24xx_irq_is_valid( rtems_vector_number vector) |
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27 | { |
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28 | return vector <= BSP_INTERRUPT_VECTOR_MAX; |
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29 | } |
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30 | |
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31 | void lpc24xx_irq_set_priority( rtems_vector_number vector, unsigned priority) |
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32 | { |
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33 | if (lpc24xx_irq_is_valid( vector)) { |
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34 | if (priority > LPC24XX_IRQ_PRIORITY_VALUE_MAX) { |
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35 | priority = LPC24XX_IRQ_PRIORITY_VALUE_MAX; |
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36 | } |
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37 | |
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38 | VICVectPriorityBase [vector] = priority; |
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39 | } |
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40 | } |
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41 | |
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42 | unsigned lpc24xx_irq_priority( rtems_vector_number vector) |
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43 | { |
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44 | if (lpc24xx_irq_is_valid( vector)) { |
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45 | return VICVectPriorityBase [vector]; |
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46 | } else { |
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47 | return LPC24XX_IRQ_PRIORITY_VALUE_MIN - 1U; |
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48 | } |
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49 | } |
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50 | |
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51 | void bsp_interrupt_dispatch( void) |
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52 | { |
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53 | /* Read current vector number */ |
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54 | rtems_vector_number vector = VICVectAddr; |
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55 | |
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56 | /* Enable interrupts in program status register */ |
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57 | uint32_t psr = arm_status_irq_enable(); |
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58 | |
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59 | /* Dispatch interrupt handlers */ |
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60 | bsp_interrupt_handler_dispatch( vector); |
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61 | |
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62 | /* Restore program status register */ |
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63 | arm_status_restore( psr); |
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64 | |
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65 | /* Acknowledge interrupt */ |
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66 | VICVectAddr = 0; |
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67 | } |
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68 | |
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69 | rtems_status_code bsp_interrupt_vector_enable( rtems_vector_number vector) |
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70 | { |
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71 | if (lpc24xx_irq_is_valid( vector)) { |
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72 | VICIntEnable = 1U << vector; |
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73 | } |
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74 | |
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75 | return RTEMS_SUCCESSFUL; |
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76 | } |
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77 | |
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78 | rtems_status_code bsp_interrupt_vector_disable( rtems_vector_number vector) |
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79 | { |
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80 | if (lpc24xx_irq_is_valid( vector)) { |
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81 | VICIntEnClear = 1U << vector; |
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82 | } |
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83 | |
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84 | return RTEMS_SUCCESSFUL; |
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85 | } |
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86 | |
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87 | /* FIXME */ |
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88 | void arm_exc_interrupt( void); |
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89 | |
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90 | rtems_status_code bsp_interrupt_facility_initialize( void) |
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91 | { |
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92 | volatile uint32_t *addr = VICVectAddrBase; |
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93 | volatile uint32_t *prio = VICVectPriorityBase; |
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94 | rtems_vector_number i = 0; |
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95 | |
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96 | /* Disable all interrupts */ |
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97 | VICIntEnClear = 0xffffffff; |
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98 | |
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99 | /* Clear all software interrupts */ |
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100 | VICSoftIntClear = 0xffffffff; |
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101 | |
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102 | /* Use IRQ category */ |
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103 | VICIntSelect = 0; |
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104 | |
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105 | for (i = BSP_INTERRUPT_VECTOR_MIN; i <= BSP_INTERRUPT_VECTOR_MAX; ++i) { |
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106 | /* Use the vector address register to store the vector number */ |
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107 | addr [i] = i; |
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108 | |
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109 | /* Give vector lowest priority */ |
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110 | prio [i] = 15; |
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111 | } |
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112 | |
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113 | /* Reset priority mask register */ |
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114 | VICSWPrioMask = 0xffff; |
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115 | |
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116 | /* Acknowledge interrupt */ |
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117 | VICVectAddr = 0; |
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118 | |
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119 | /* Install the IRQ exception handler */ |
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120 | _CPU_ISR_install_vector( ARM_EXCEPTION_IRQ, arm_exc_interrupt, NULL); |
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121 | |
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122 | return RTEMS_SUCCESSFUL; |
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123 | } |
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124 | |
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125 | void bsp_interrupt_handler_default( rtems_vector_number vector) |
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126 | { |
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127 | printk( "spurious interrupt: %u\n", vector); |
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128 | } |
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