[94e1931c] | 1 | /* |
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| 2 | * |
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| 3 | * This file contains the PIC-independent implementation of the functions described in irq.h |
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| 4 | * |
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| 5 | * Copyright (C) 1998, 1999 valette@crf.canon.fr |
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| 6 | * |
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| 7 | * The license and distribution terms for this file may be |
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[e71a3a84] | 8 | * found in the file LICENSE in this distribution or at |
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[c499856] | 9 | * http://www.rtems.org/license/LICENSE. |
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[94e1931c] | 10 | */ |
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| 11 | |
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| 12 | #include <stdlib.h> |
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| 13 | |
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| 14 | #include <rtems.h> |
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| 15 | #include <stdlib.h> |
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| 16 | #include <rtems/bspIo.h> /* for printk */ |
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| 17 | #include <libcpu/spr.h> |
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[010bf86] | 18 | #include <bsp/irq_supp.h> |
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| 19 | #include <bsp/vectors.h> |
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[94e1931c] | 20 | |
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| 21 | /* |
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| 22 | * default handler connected on each irq after bsp initialization |
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| 23 | */ |
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| 24 | static rtems_irq_connect_data default_rtems_entry; |
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| 25 | |
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| 26 | /* |
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| 27 | * location used to store initial tables used for interrupt |
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| 28 | * management. |
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| 29 | */ |
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| 30 | static rtems_irq_global_settings* internal_config; |
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| 31 | static rtems_irq_connect_data* rtems_hdl_tbl; |
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| 32 | |
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| 33 | |
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| 34 | SPR_RW(BOOKE_TSR) |
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[3c6fe2e] | 35 | SPR_RW(PPC405_TSR) |
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[94e1931c] | 36 | |
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| 37 | /* legacy mode for bookE DEC exception; |
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| 38 | * to avoid the double layer of function calls |
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| 39 | * (dec_handler_bookE -> C_dispatch_irq_handler -> user handler) |
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[359e537] | 40 | * it is preferrable for the user to hook the DEC |
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[94e1931c] | 41 | * exception directly. |
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| 42 | * However, the legacy mode works with less modifications |
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| 43 | * of user code. |
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| 44 | */ |
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[602d5ba] | 45 | static int C_dispatch_dec_handler_bookE (BSP_Exception_frame *frame, unsigned int excNum) |
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[94e1931c] | 46 | { |
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| 47 | /* clear interrupt; we must do this |
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| 48 | * before C_dispatch_irq_handler() |
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| 49 | * re-enables MSR_EE. |
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[3c6fe2e] | 50 | * Note that PPC405 uses a different SPR# for TSR |
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[94e1931c] | 51 | */ |
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[359e537] | 52 | if ( ppc_cpu_is_bookE()==PPC_BOOKE_405) |
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[3c6fe2e] | 53 | _write_PPC405_TSR( BOOKE_TSR_DIS ); |
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| 54 | else |
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| 55 | _write_BOOKE_TSR( BOOKE_TSR_DIS ); |
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[359e537] | 56 | return C_dispatch_irq_handler(frame, ASM_DEC_VECTOR); |
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[94e1931c] | 57 | } |
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| 58 | |
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| 59 | /* |
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| 60 | * ------------------------ RTEMS Irq helper functions ---------------- |
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| 61 | */ |
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| 62 | |
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| 63 | /* |
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| 64 | * This function check that the value given for the irq line |
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| 65 | * is valid. |
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| 66 | */ |
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| 67 | |
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| 68 | static int isValidInterrupt(int irq) |
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| 69 | { |
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| 70 | if ( (irq < internal_config->irqBase) || (irq >= internal_config->irqBase + internal_config->irqNb)) |
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| 71 | return 0; |
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| 72 | return 1; |
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| 73 | } |
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| 74 | |
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| 75 | /* |
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| 76 | * ------------------------ RTEMS Shared Irq Handler Mngt Routines ---------------- |
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| 77 | */ |
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| 78 | int BSP_install_rtems_shared_irq_handler (const rtems_irq_connect_data* irq) |
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| 79 | { |
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| 80 | rtems_interrupt_level level; |
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| 81 | rtems_irq_connect_data* vchain; |
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| 82 | |
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| 83 | if (!isValidInterrupt(irq->name)) { |
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| 84 | printk("Invalid interrupt vector %d\n",irq->name); |
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| 85 | return 0; |
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| 86 | } |
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| 87 | |
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[21637fd] | 88 | /* pre-allocate memory outside of critical section */ |
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| 89 | vchain = (rtems_irq_connect_data*)malloc(sizeof(rtems_irq_connect_data)); |
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| 90 | |
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[94e1931c] | 91 | rtems_interrupt_disable(level); |
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| 92 | |
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[910adc3] | 93 | if ( (intptr_t)rtems_hdl_tbl[irq->name].next_handler == -1 ) { |
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[94e1931c] | 94 | rtems_interrupt_enable(level); |
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| 95 | printk("IRQ vector %d already connected to an unshared handler\n",irq->name); |
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[21637fd] | 96 | free(vchain); |
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[94e1931c] | 97 | return 0; |
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| 98 | } |
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| 99 | |
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| 100 | /* save off topmost handler */ |
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| 101 | vchain[0]= rtems_hdl_tbl[irq->name]; |
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| 102 | |
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| 103 | /* |
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| 104 | * store the data provided by user |
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| 105 | */ |
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| 106 | rtems_hdl_tbl[irq->name] = *irq; |
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| 107 | |
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| 108 | /* link chain to new topmost handler */ |
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| 109 | rtems_hdl_tbl[irq->name].next_handler = (void *)vchain; |
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| 110 | |
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| 111 | /* |
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| 112 | * enable_irq_at_pic is supposed to ignore |
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| 113 | * requests to disable interrupts outside |
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| 114 | * of the range handled by the PIC |
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| 115 | */ |
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| 116 | BSP_enable_irq_at_pic(irq->name); |
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| 117 | |
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| 118 | /* |
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| 119 | * Enable interrupt on device |
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| 120 | */ |
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| 121 | if (irq->on) |
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| 122 | irq->on(irq); |
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| 123 | |
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| 124 | rtems_interrupt_enable(level); |
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| 125 | |
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| 126 | return 1; |
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| 127 | } |
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| 128 | |
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| 129 | /* |
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| 130 | * ------------------------ RTEMS Single Irq Handler Mngt Routines ---------------- |
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| 131 | */ |
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| 132 | |
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| 133 | int BSP_install_rtems_irq_handler (const rtems_irq_connect_data* irq) |
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| 134 | { |
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| 135 | rtems_interrupt_level level; |
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| 136 | |
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| 137 | if (!isValidInterrupt(irq->name)) { |
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| 138 | printk("Invalid interrupt vector %d\n",irq->name); |
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| 139 | return 0; |
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| 140 | } |
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| 141 | /* |
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| 142 | * Check if default handler is actually connected. If not issue an error. |
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| 143 | * You must first get the current handler via i386_get_current_idt_entry |
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| 144 | * and then disconnect it using i386_delete_idt_entry. |
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| 145 | * RATIONALE : to always have the same transition by forcing the user |
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| 146 | * to get the previous handler before accepting to disconnect. |
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| 147 | */ |
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| 148 | rtems_interrupt_disable(level); |
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| 149 | if (rtems_hdl_tbl[irq->name].hdl != default_rtems_entry.hdl) { |
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| 150 | rtems_interrupt_enable(level); |
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| 151 | printk("IRQ vector %d already connected\n",irq->name); |
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| 152 | return 0; |
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| 153 | } |
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| 154 | |
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| 155 | /* |
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| 156 | * store the data provided by user |
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| 157 | */ |
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| 158 | rtems_hdl_tbl[irq->name] = *irq; |
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| 159 | rtems_hdl_tbl[irq->name].next_handler = (void *)-1; |
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| 160 | |
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| 161 | /* |
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| 162 | * enable_irq_at_pic is supposed to ignore |
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| 163 | * requests to disable interrupts outside |
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| 164 | * of the range handled by the PIC |
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| 165 | */ |
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| 166 | BSP_enable_irq_at_pic(irq->name); |
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| 167 | |
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| 168 | /* |
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| 169 | * Enable interrupt on device |
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| 170 | */ |
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| 171 | if (irq->on) |
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| 172 | irq->on(irq); |
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| 173 | |
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| 174 | rtems_interrupt_enable(level); |
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| 175 | |
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| 176 | return 1; |
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| 177 | } |
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| 178 | |
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| 179 | int BSP_get_current_rtems_irq_handler (rtems_irq_connect_data* irq) |
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| 180 | { |
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| 181 | rtems_interrupt_level level; |
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| 182 | |
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| 183 | if (!isValidInterrupt(irq->name)) { |
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| 184 | return 0; |
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| 185 | } |
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| 186 | rtems_interrupt_disable(level); |
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| 187 | *irq = rtems_hdl_tbl[irq->name]; |
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| 188 | rtems_interrupt_enable(level); |
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| 189 | return 1; |
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| 190 | } |
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| 191 | |
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| 192 | int BSP_remove_rtems_irq_handler (const rtems_irq_connect_data* irq) |
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| 193 | { |
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| 194 | rtems_irq_connect_data *pchain= NULL, *vchain = NULL; |
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| 195 | rtems_interrupt_level level; |
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| 196 | |
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| 197 | if (!isValidInterrupt(irq->name)) { |
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| 198 | return 0; |
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| 199 | } |
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| 200 | /* |
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| 201 | * Check if default handler is actually connected. If not issue an error. |
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| 202 | * You must first get the current handler via i386_get_current_idt_entry |
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| 203 | * and then disconnect it using i386_delete_idt_entry. |
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| 204 | * RATIONALE : to always have the same transition by forcing the user |
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| 205 | * to get the previous handler before accepting to disconnect. |
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| 206 | */ |
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| 207 | rtems_interrupt_disable(level); |
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| 208 | if (rtems_hdl_tbl[irq->name].hdl != irq->hdl) { |
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| 209 | rtems_interrupt_enable(level); |
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| 210 | return 0; |
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| 211 | } |
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| 212 | |
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[910adc3] | 213 | if( (intptr_t)rtems_hdl_tbl[irq->name].next_handler != -1 ) |
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[94e1931c] | 214 | { |
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| 215 | int found = 0; |
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| 216 | |
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| 217 | for( (pchain= NULL, vchain = &rtems_hdl_tbl[irq->name]); |
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| 218 | (vchain->hdl != default_rtems_entry.hdl); |
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| 219 | (pchain= vchain, vchain = (rtems_irq_connect_data*)vchain->next_handler) ) |
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| 220 | { |
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| 221 | if( vchain->hdl == irq->hdl ) |
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| 222 | { |
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| 223 | found= -1; break; |
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| 224 | } |
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| 225 | } |
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| 226 | |
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| 227 | if( !found ) |
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| 228 | { |
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| 229 | rtems_interrupt_enable(level); |
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| 230 | return 0; |
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| 231 | } |
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| 232 | } |
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| 233 | else |
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[bc0ff47] | 234 | { |
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| 235 | if (rtems_hdl_tbl[irq->name].hdl != irq->hdl) |
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| 236 | { |
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| 237 | rtems_interrupt_enable(level); |
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| 238 | return 0; |
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| 239 | } |
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| 240 | } |
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[94e1931c] | 241 | |
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| 242 | /* |
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| 243 | * Disable interrupt on device |
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| 244 | */ |
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| 245 | if (irq->off) |
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| 246 | irq->off(irq); |
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| 247 | |
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| 248 | /* |
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| 249 | * restore the default irq value |
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| 250 | */ |
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| 251 | if( !vchain ) |
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| 252 | { |
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| 253 | /* single handler vector... */ |
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| 254 | rtems_hdl_tbl[irq->name] = default_rtems_entry; |
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| 255 | } |
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| 256 | else |
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| 257 | { |
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| 258 | if( pchain ) |
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| 259 | { |
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| 260 | /* non-first handler being removed */ |
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| 261 | pchain->next_handler = vchain->next_handler; |
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| 262 | } |
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| 263 | else |
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| 264 | { |
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| 265 | /* first handler isn't malloc'ed, so just overwrite it. Since |
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| 266 | the contents of vchain are being struct copied, vchain itself |
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| 267 | goes away */ |
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| 268 | vchain = vchain->next_handler; |
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| 269 | rtems_hdl_tbl[irq->name]= *vchain; |
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| 270 | } |
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| 271 | } |
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| 272 | |
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[bc0ff47] | 273 | /* Only disable at PIC if we removed the last handler */ |
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| 274 | if ( rtems_hdl_tbl[irq->name].hdl == default_rtems_entry.hdl ) { |
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| 275 | /* |
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| 276 | * disable_irq_at_pic is supposed to ignore |
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| 277 | * requests to disable interrupts outside |
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| 278 | * of the range handled by the PIC; |
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| 279 | */ |
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| 280 | BSP_disable_irq_at_pic(irq->name); |
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| 281 | } |
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| 282 | |
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[94e1931c] | 283 | rtems_interrupt_enable(level); |
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| 284 | |
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[21637fd] | 285 | free(vchain); |
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| 286 | |
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[94e1931c] | 287 | return 1; |
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| 288 | } |
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| 289 | |
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| 290 | /* |
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| 291 | * Less cumbersome, alternate entry points; |
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| 292 | * RETURNS: more traditional, 0 on success, nonzero on error |
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| 293 | */ |
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| 294 | |
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| 295 | static int doit( |
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| 296 | int (*p)(const rtems_irq_connect_data*), |
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| 297 | rtems_irq_number n, |
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| 298 | rtems_irq_hdl hdl, |
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| 299 | rtems_irq_hdl_param prm) |
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| 300 | { |
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| 301 | rtems_irq_connect_data xx; |
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| 302 | xx.name = n; |
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| 303 | xx.hdl = hdl; |
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| 304 | xx.handle = prm; |
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| 305 | xx.on = 0; |
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| 306 | xx.off = 0; |
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| 307 | xx.isOn = 0; |
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| 308 | return ! p(&xx); |
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| 309 | } |
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| 310 | |
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| 311 | int BSP_rtems_int_connect(rtems_irq_number n, rtems_irq_hdl hdl, rtems_irq_hdl_param p) |
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| 312 | { |
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| 313 | return doit(BSP_install_rtems_shared_irq_handler, n, hdl, p); |
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| 314 | } |
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| 315 | |
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| 316 | int BSP_rtems_int_disconnect(rtems_irq_number n, rtems_irq_hdl hdl, rtems_irq_hdl_param p) |
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| 317 | { |
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| 318 | return doit(BSP_remove_rtems_irq_handler, n, hdl, p); |
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| 319 | } |
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| 320 | |
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| 321 | |
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| 322 | /* |
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| 323 | * RTEMS Global Interrupt Handler Management Routines |
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| 324 | */ |
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| 325 | |
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| 326 | int BSP_rtems_irq_mngt_set(rtems_irq_global_settings* config) |
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| 327 | { |
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| 328 | int i; |
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| 329 | rtems_interrupt_level level; |
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| 330 | rtems_irq_connect_data* vchain; |
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| 331 | |
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| 332 | /* |
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| 333 | * Store various code accelerators |
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| 334 | */ |
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| 335 | internal_config = config; |
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| 336 | default_rtems_entry = config->defaultEntry; |
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| 337 | rtems_hdl_tbl = config->irqHdlTbl; |
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| 338 | |
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| 339 | rtems_interrupt_disable(level); |
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| 340 | |
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| 341 | if ( !BSP_setup_the_pic(config) ) { |
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| 342 | printk("PIC setup failed; leaving IRQs OFF\n"); |
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| 343 | return 0; |
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| 344 | } |
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| 345 | |
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| 346 | for ( i = config->irqBase; i < config->irqBase + config->irqNb; i++ ) { |
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| 347 | for( vchain = &rtems_hdl_tbl[i]; |
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[910adc3] | 348 | ((intptr_t)vchain != -1 && vchain->hdl != default_rtems_entry.hdl); |
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[94e1931c] | 349 | vchain = (rtems_irq_connect_data*)vchain->next_handler ) |
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| 350 | { |
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| 351 | if (vchain->on) |
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| 352 | vchain->on(vchain); |
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| 353 | } |
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[8d2487f] | 354 | if ( vchain != &rtems_hdl_tbl[i] ) { |
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| 355 | /* at least one handler registered */ |
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| 356 | BSP_enable_irq_at_pic(i); |
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| 357 | } else { |
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[d56c678] | 358 | /* Do NOT disable; there might be boards with cascaded |
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| 359 | * interrupt controllers where the BSP (incorrectly) does |
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| 360 | * not ignore the cascaded interrupts in BSP_disable_irq_at_pic()! |
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[359e537] | 361 | * Instead, we rely on BSP_setup_the_pic() for a good |
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| 362 | * initial configuration. |
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| 363 | * |
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[8d2487f] | 364 | BSP_disable_irq_at_pic(i); |
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[d56c678] | 365 | */ |
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[8d2487f] | 366 | } |
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[94e1931c] | 367 | } |
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| 368 | |
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| 369 | rtems_interrupt_enable(level); |
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| 370 | |
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| 371 | { |
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| 372 | ppc_exc_set_handler(ASM_EXT_VECTOR, C_dispatch_irq_handler); |
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| 373 | |
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[359e537] | 374 | if ( ppc_cpu_is_bookE() ) { |
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[94e1931c] | 375 | /* bookE decrementer interrupt needs to be cleared BEFORE |
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| 376 | * dispatching the user ISR (because the user ISR is called |
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| 377 | * with EE enabled) |
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| 378 | * We do this so that existing DEC handlers can be used |
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| 379 | * with minor modifications. |
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| 380 | */ |
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[4dd7d3d] | 381 | ppc_exc_set_handler(ASM_BOOKE_DEC_VECTOR, C_dispatch_dec_handler_bookE); |
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[94e1931c] | 382 | } else { |
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| 383 | ppc_exc_set_handler(ASM_DEC_VECTOR, C_dispatch_irq_handler); |
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| 384 | } |
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| 385 | } |
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| 386 | return 1; |
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| 387 | } |
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| 388 | |
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| 389 | int BSP_rtems_irq_mngt_get(rtems_irq_global_settings** config) |
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| 390 | { |
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| 391 | *config = internal_config; |
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| 392 | return 0; |
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| 393 | } |
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