[3d6669cc] | 1 | /* |
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| 2 | * Cirrus EP7312 Intererrupt handler |
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| 3 | * |
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| 4 | * Copyright (c) 2002 by Jay Monkman <jtm@smoothsmoothie.com> |
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[6128a4a] | 5 | * |
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[3d6669cc] | 6 | * Copyright (c) 2002 by Charlie Steader <charlies@poliac.com> |
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| 7 | * |
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| 8 | * The license and distribution terms for this file may be |
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| 9 | * found in the file LICENSE in this distribution or at |
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| 10 | * |
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[f2f11abe] | 11 | * http://www.rtems.com/license/LICENSE. |
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[3d6669cc] | 12 | * |
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| 13 | * |
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| 14 | * $Id$ |
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| 15 | */ |
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| 16 | |
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| 17 | #ifndef __IRQ_H__ |
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| 18 | #define __IRQ_H__ |
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| 19 | |
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| 20 | #ifdef __cplusplus |
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| 21 | extern "C" { |
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| 22 | #endif |
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| 23 | |
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| 24 | /* define that can be useful (the values are just examples) */ |
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| 25 | #define VECTOR_TABLE 0x40 |
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| 26 | |
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| 27 | #ifndef __asm__ |
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| 28 | |
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| 29 | /* |
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| 30 | * Include some preprocessor value also used by assember code |
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| 31 | */ |
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[6128a4a] | 32 | |
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[3d6669cc] | 33 | #include <rtems.h> |
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| 34 | |
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| 35 | extern void default_int_handler(); |
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| 36 | /*-------------------------------------------------------------------------+ |
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| 37 | | Constants |
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| 38 | +--------------------------------------------------------------------------*/ |
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| 39 | |
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| 40 | /* enum of the possible interrupt sources */ |
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[309775c] | 41 | typedef unsigned int rtems_irq_number; |
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[3d6669cc] | 42 | /* int interrupt status/mask register 1 */ |
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[309775c] | 43 | #define BSP_EXTFIQ 0 |
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| 44 | #define BSP_BLINT 1 |
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| 45 | #define BSP_WEINT 2 |
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| 46 | #define BSP_MCINT 3 |
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| 47 | #define BSP_CSINT 4 |
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| 48 | #define BSP_EINT1 5 |
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| 49 | #define BSP_EINT2 6 |
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| 50 | #define BSP_EINT3 7 |
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| 51 | #define BSP_TC1OI 8 |
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| 52 | #define BSP_TC2OI 9 |
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| 53 | #define BSP_RTCMI 10 |
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| 54 | #define BSP_TINT 11 |
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| 55 | #define BSP_UTXINT1 12 |
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| 56 | #define BSP_URXINT1 13 |
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| 57 | #define BSP_UMSINT 14 |
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| 58 | #define BSP_SSEOTI 15 |
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| 59 | /* int interrupt status/mask register 2 */ |
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| 60 | #define BSP_KBDINT 16 |
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| 61 | #define BSP_SS2RX 17 |
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| 62 | #define BSP_SS2TX 18 |
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| 63 | #define BSP_UTXINT2 19 |
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| 64 | #define BSP_URXINT2 20 |
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| 65 | /* int interrupt status/mask register 3 */ |
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| 66 | #define BSP_DAIINT 21 |
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| 67 | #define BSP_MAX_INT 22 |
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[3d6669cc] | 68 | |
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| 69 | /* |
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| 70 | * Type definition for RTEMS managed interrupts |
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| 71 | */ |
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| 72 | typedef unsigned char rtems_irq_level; |
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| 73 | typedef unsigned char rtems_irq_trigger; |
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| 74 | |
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| 75 | struct __rtems_irq_connect_data__; /* forward declaratiuon */ |
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| 76 | |
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| 77 | typedef void (*rtems_irq_hdl) (void); |
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| 78 | typedef void (*rtems_irq_enable) (const struct __rtems_irq_connect_data__*); |
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| 79 | typedef void (*rtems_irq_disable) (const struct __rtems_irq_connect_data__*); |
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| 80 | typedef int (*rtems_irq_is_enabled)(const struct __rtems_irq_connect_data__*); |
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| 81 | |
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| 82 | typedef struct __rtems_irq_connect_data__ { |
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| 83 | /* |
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| 84 | * IRQ line |
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| 85 | */ |
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[309775c] | 86 | rtems_irq_number name; |
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[3d6669cc] | 87 | /* |
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| 88 | * handler. See comment on handler properties below in function prototype. |
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| 89 | */ |
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| 90 | rtems_irq_hdl hdl; |
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| 91 | /* |
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| 92 | * function for enabling interrupts at device level (ONLY!). |
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| 93 | * The BSP code will automatically enable it at i8259s level. |
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| 94 | * RATIONALE : anyway such code has to exist in current driver code. |
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| 95 | * It is usually called immediately AFTER connecting the interrupt handler. |
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| 96 | * RTEMS may well need such a function when restoring normal interrupt |
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| 97 | * processing after a debug session. |
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[6128a4a] | 98 | * |
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[3d6669cc] | 99 | */ |
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[6128a4a] | 100 | rtems_irq_enable on; |
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[3d6669cc] | 101 | /* |
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| 102 | * function for disabling interrupts at device level (ONLY!). |
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| 103 | * The code will disable it at i8259s level. RATIONALE : anyway |
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| 104 | * such code has to exist for clean shutdown. It is usually called |
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| 105 | * BEFORE disconnecting the interrupt. RTEMS may well need such |
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| 106 | * a function when disabling normal interrupt processing for |
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| 107 | * a debug session. May well be a NOP function. |
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| 108 | */ |
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| 109 | rtems_irq_disable off; |
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| 110 | /* |
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| 111 | * function enabling to know what interrupt may currently occur |
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| 112 | * if someone manipulates the i8259s interrupt mask without care... |
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| 113 | */ |
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| 114 | rtems_irq_is_enabled isOn; |
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| 115 | /* |
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| 116 | * priority level at the vplus level |
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| 117 | */ |
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| 118 | rtems_irq_level irqLevel; |
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| 119 | /* |
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| 120 | * Trigger way : Rising or falling edge or High or low level |
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| 121 | */ |
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| 122 | rtems_irq_trigger irqTrigger; |
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| 123 | } rtems_irq_connect_data; |
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| 124 | |
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| 125 | /*-------------------------------------------------------------------------+ |
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| 126 | | Function Prototypes. |
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| 127 | +--------------------------------------------------------------------------*/ |
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| 128 | /* |
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| 129 | * ------------------- RTEMS Single Irq Handler Mngt Routines ---------------- |
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| 130 | */ |
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| 131 | |
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| 132 | /* |
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| 133 | * function to initialize the interrupt for a specific BSP |
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| 134 | */ |
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| 135 | void BSP_rtems_irq_mngt_init(); |
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| 136 | |
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| 137 | /* |
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| 138 | * function to connect a particular irq handler. This hanlder will NOT be called |
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| 139 | * directly as the result of the corresponding interrupt. Instead, a RTEMS |
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| 140 | * irq prologue will be called that will : |
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| 141 | * |
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| 142 | * 1) save the C scratch registers, |
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| 143 | * 2) switch to a interrupt stack if the interrupt is not nested, |
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| 144 | * 3) store the current i8259s' interrupt masks |
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| 145 | * 4) modify them to disable the current interrupt at 8259 level (and may |
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| 146 | * be others depending on software priorities) |
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| 147 | * 5) aknowledge the i8259s', |
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| 148 | * 6) demask the processor, |
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| 149 | * 7) call the application handler |
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| 150 | * |
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| 151 | * As a result the hdl function provided |
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| 152 | * |
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| 153 | * a) can perfectly be written is C, |
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| 154 | * b) may also well directly call the part of the RTEMS API that can be used |
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| 155 | * from interrupt level, |
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| 156 | * c) It only responsible for handling the jobs that need to be done at |
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| 157 | * the device level including (aknowledging/re-enabling the interrupt at device, |
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| 158 | * level, getting the data,...) |
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| 159 | * |
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| 160 | * When returning from the function, the following will be performed by |
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| 161 | * the RTEMS irq epilogue : |
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| 162 | * |
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| 163 | * 1) masks the interrupts again, |
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| 164 | * 2) restore the original i8259s' interrupt masks |
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| 165 | * 3) switch back on the orinal stack if needed, |
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| 166 | * 4) perform rescheduling when necessary, |
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| 167 | * 5) restore the C scratch registers... |
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| 168 | * 6) restore initial execution flow |
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[6128a4a] | 169 | * |
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[3d6669cc] | 170 | */ |
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| 171 | |
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| 172 | int BSP_install_rtems_irq_handler (const rtems_irq_connect_data*); |
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| 173 | /* |
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| 174 | * function to get the current RTEMS irq handler for ptr->name. It enables to |
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| 175 | * define hanlder chain... |
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| 176 | */ |
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| 177 | int BSP_get_current_rtems_irq_handler (rtems_irq_connect_data* ptr); |
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| 178 | /* |
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| 179 | * function to get disconnect the RTEMS irq handler for ptr->name. |
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| 180 | * This function checks that the value given is the current one for safety reason. |
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| 181 | * The user can use the previous function to get it. |
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| 182 | */ |
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| 183 | int BSP_remove_rtems_irq_handler (const rtems_irq_connect_data*); |
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| 184 | |
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| 185 | #endif /* __asm__ */ |
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| 186 | |
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| 187 | #ifdef __cplusplus |
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| 188 | } |
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| 189 | #endif |
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| 190 | |
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| 191 | #endif /* __IRQ_H__ */ |
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