1 | /** |
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2 | * @file irq.c |
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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) 2014 Andre Marques <andre.lousa.marques at gmail.com> |
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11 | * |
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12 | * Copyright (c) 2009 |
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13 | * embedded brains GmbH |
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14 | * Obere Lagerstr. 30 |
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15 | * D-82178 Puchheim |
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16 | * Germany |
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17 | * <rtems@embedded-brains.de> |
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18 | * |
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19 | * The license and distribution terms for this file may be |
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20 | * found in the file LICENSE in this distribution or at |
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21 | * http://www.rtems.org/license/LICENSE. |
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22 | */ |
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23 | |
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24 | #include <rtems/score/armv4.h> |
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25 | |
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26 | #include <bsp.h> |
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27 | #include <bsp/irq.h> |
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28 | #include <bsp/irq-generic.h> |
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29 | #include <bsp/raspberrypi.h> |
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30 | #include <bsp/linker-symbols.h> |
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31 | #include <bsp/mmu.h> |
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32 | #include <rtems/bspIo.h> |
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33 | #include <strings.h> |
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34 | |
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35 | typedef struct { |
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36 | unsigned long enable_reg_addr; |
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37 | unsigned long disable_reg_addr; |
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38 | } bcm2835_irq_ctrl_reg_t; |
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39 | |
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40 | static const bcm2835_irq_ctrl_reg_t bcm2835_irq_ctrl_reg_table[] = { |
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41 | { BCM2835_IRQ_ENABLE1, BCM2835_IRQ_DISABLE1 }, |
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42 | { BCM2835_IRQ_ENABLE2, BCM2835_IRQ_DISABLE2 }, |
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43 | { BCM2835_IRQ_ENABLE_BASIC, BCM2835_IRQ_DISABLE_BASIC } |
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44 | }; |
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45 | |
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46 | static inline const bcm2835_irq_ctrl_reg_t * |
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47 | bsp_vector_to_reg(rtems_vector_number vector) |
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48 | { |
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49 | return bcm2835_irq_ctrl_reg_table + (vector >> 5); |
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50 | } |
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51 | |
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52 | static inline uint32_t |
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53 | bsp_vector_to_mask(rtems_vector_number vector) |
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54 | { |
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55 | return 1 << (vector & 0x1f); |
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56 | } |
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57 | |
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58 | static const int bcm2835_irq_speedup_table[] = |
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59 | { |
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60 | /* 0 */ BCM2835_IRQ_ID_BASIC_BASE_ID + 0, |
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61 | /* 1 */ BCM2835_IRQ_ID_BASIC_BASE_ID + 1, |
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62 | /* 2 */ BCM2835_IRQ_ID_BASIC_BASE_ID + 2, |
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63 | /* 3 */ BCM2835_IRQ_ID_BASIC_BASE_ID + 3, |
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64 | /* 4 */ BCM2835_IRQ_ID_BASIC_BASE_ID + 4, |
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65 | /* 5 */ BCM2835_IRQ_ID_BASIC_BASE_ID + 5, |
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66 | /* 6 */ BCM2835_IRQ_ID_BASIC_BASE_ID + 6, |
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67 | /* 7 */ BCM2835_IRQ_ID_BASIC_BASE_ID + 7, |
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68 | /* 8 */ -1, /* One or more bits set in pending register 1 */ |
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69 | /* 9 */ -2, /* One or more bits set in pending register 2 */ |
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70 | /* 10 */ 7, /* GPU IRQ 7 */ |
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71 | /* 11 */ 9, /* GPU IRQ 9 */ |
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72 | /* 12 */ 10, /* GPU IRQ 10 */ |
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73 | /* 13 */ 18, /* GPU IRQ 18 */ |
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74 | /* 14 */ 19, /* GPU IRQ 19 */ |
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75 | /* 15 */ 53, /* GPU IRQ 53 */ |
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76 | /* 16 */ 54, /* GPU IRQ 54 */ |
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77 | /* 17 */ 55, /* GPU IRQ 55 */ |
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78 | /* 18 */ 56, /* GPU IRQ 56 */ |
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79 | /* 19 */ 57, /* GPU IRQ 57 */ |
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80 | /* 20 */ 62, /* GPU IRQ 62 */ |
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81 | }; |
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82 | |
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83 | /* |
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84 | * Define which basic peding register (BCM2835_IRQ_BASIC) bits |
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85 | * should be processed through bcm2835_irq_speedup_table |
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86 | */ |
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87 | |
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88 | #define BCM2835_IRQ_BASIC_SPEEDUP_USED_BITS 0x1ffcff |
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89 | |
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90 | /* |
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91 | * Determine the source of the interrupt and dispatch the correct handler. |
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92 | */ |
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93 | void bsp_interrupt_dispatch(void) |
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94 | { |
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95 | unsigned int pend; |
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96 | unsigned int pend_bit; |
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97 | |
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98 | rtems_vector_number vector = 255; |
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99 | |
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100 | pend = BCM2835_REG(BCM2835_IRQ_BASIC); |
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101 | if ( pend & BCM2835_IRQ_BASIC_SPEEDUP_USED_BITS ) { |
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102 | pend_bit = ffs(pend) - 1; |
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103 | vector = bcm2835_irq_speedup_table[pend_bit]; |
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104 | } else { |
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105 | pend = BCM2835_REG(BCM2835_IRQ_PENDING1); |
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106 | if ( pend != 0 ) { |
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107 | pend_bit = ffs(pend) - 1; |
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108 | vector = pend_bit; |
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109 | } else { |
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110 | pend = BCM2835_REG(BCM2835_IRQ_PENDING2); |
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111 | if ( pend != 0 ) { |
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112 | pend_bit = ffs(pend) - 1; |
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113 | vector = pend_bit + 32; |
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114 | } |
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115 | } |
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116 | } |
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117 | |
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118 | if ( vector < 255 ) |
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119 | { |
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120 | bsp_interrupt_handler_dispatch(vector); |
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121 | } |
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122 | } |
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123 | |
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124 | rtems_status_code bsp_interrupt_vector_enable(rtems_vector_number vector) |
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125 | { |
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126 | if ( vector > BSP_INTERRUPT_VECTOR_MAX ) |
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127 | return RTEMS_INVALID_ID; |
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128 | |
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129 | BCM2835_REG(bsp_vector_to_reg(vector)->enable_reg_addr) = |
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130 | bsp_vector_to_mask(vector); |
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131 | |
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132 | return RTEMS_SUCCESSFUL; |
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133 | } |
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134 | |
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135 | rtems_status_code bsp_interrupt_vector_disable(rtems_vector_number vector) |
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136 | { |
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137 | if ( vector > BSP_INTERRUPT_VECTOR_MAX ) |
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138 | return RTEMS_INVALID_ID; |
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139 | |
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140 | BCM2835_REG(bsp_vector_to_reg(vector)->disable_reg_addr) = |
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141 | bsp_vector_to_mask(vector); |
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142 | |
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143 | return RTEMS_SUCCESSFUL; |
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144 | } |
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145 | |
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146 | void bsp_interrupt_handler_default(rtems_vector_number vector) |
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147 | { |
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148 | printk("spurious interrupt: %lu\n", vector); |
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149 | } |
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150 | |
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151 | rtems_status_code bsp_interrupt_facility_initialize(void) |
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152 | { |
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153 | BCM2835_REG(BCM2835_IRQ_DISABLE1) = 0xffffffff; |
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154 | BCM2835_REG(BCM2835_IRQ_DISABLE2) = 0xffffffff; |
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155 | BCM2835_REG(BCM2835_IRQ_DISABLE_BASIC) = 0xffffffff; |
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156 | BCM2835_REG(BCM2835_IRQ_FIQ_CTRL) = 0; |
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157 | return RTEMS_SUCCESSFUL; |
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158 | } |
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