[c32b1ef] | 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 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.com/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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