1 | /* SPDX-License-Identifier: BSD-2-Clause */ |
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2 | |
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3 | /** |
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4 | * @file |
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5 | * |
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6 | * @ingroup RTEMSBSPsPowerPC |
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7 | * |
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8 | * @brief Generic Interrupt suppoer |
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9 | */ |
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10 | |
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11 | /* |
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12 | * Copyright (C) 2021 Chris Johns. All rights reserved. |
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13 | * |
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14 | * Redistribution and use in source and binary forms, with or without |
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15 | * modification, are permitted provided that the following conditions |
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16 | * are met: |
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17 | * 1. Redistributions of source code must retain the above copyright |
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18 | * notice, this list of conditions and the following disclaimer. |
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19 | * 2. Redistributions in binary form must reproduce the above copyright |
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20 | * notice, this list of conditions and the following disclaimer in the |
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21 | * documentation and/or other materials provided with the distribution. |
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22 | * |
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23 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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24 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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25 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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26 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
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27 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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28 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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29 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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30 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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31 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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32 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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33 | * POSSIBILITY OF SUCH DAMAGE. |
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34 | */ |
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35 | |
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36 | #include <stdlib.h> |
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37 | |
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38 | #include <rtems.h> |
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39 | #include <stdlib.h> |
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40 | #include <rtems/bspIo.h> /* for printk */ |
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41 | #include <libcpu/spr.h> |
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42 | #include <bsp/irq_supp.h> |
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43 | #include <bsp/irq-generic.h> |
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44 | #include <bsp/vectors.h> |
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45 | |
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46 | SPR_RW(BOOKE_TSR) |
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47 | SPR_RW(PPC405_TSR) |
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48 | |
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49 | /* legacy mode for bookE DEC exception; |
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50 | * to avoid the double layer of function calls |
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51 | * (dec_handler_bookE -> C_dispatch_irq_handler -> user handler) |
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52 | * it is preferrable for the user to hook the DEC |
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53 | * exception directly. |
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54 | * However, the legacy mode works with less modifications |
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55 | * of user code. |
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56 | */ |
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57 | static int C_dispatch_dec_handler_bookE (BSP_Exception_frame *frame, unsigned int excNum) |
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58 | { |
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59 | /* clear interrupt; we must do this |
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60 | * before C_dispatch_irq_handler() |
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61 | * re-enables MSR_EE. |
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62 | * Note that PPC405 uses a different SPR# for TSR |
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63 | */ |
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64 | if (ppc_cpu_is_bookE()==PPC_BOOKE_405) |
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65 | _write_PPC405_TSR( BOOKE_TSR_DIS ); |
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66 | else |
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67 | _write_BOOKE_TSR( BOOKE_TSR_DIS ); |
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68 | return C_dispatch_irq_handler(frame, ASM_DEC_VECTOR); |
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69 | } |
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70 | |
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71 | /* |
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72 | * RTEMS Global Interrupt Handler Management Routines |
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73 | */ |
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74 | int BSP_rtems_irq_generic_set(rtems_irq_global_settings* config) |
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75 | { |
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76 | int r; |
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77 | |
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78 | r = BSP_setup_the_pic(config); |
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79 | if (!r) |
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80 | return r; |
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81 | |
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82 | ppc_exc_set_handler(ASM_EXT_VECTOR, C_dispatch_irq_handler); |
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83 | if ( ppc_cpu_is_bookE() ) { |
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84 | /* bookE decrementer interrupt needs to be cleared BEFORE |
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85 | * dispatching the user ISR (because the user ISR is called |
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86 | * with EE enabled) |
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87 | * We do this so that existing DEC handlers can be used |
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88 | * with minor modifications. |
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89 | */ |
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90 | ppc_exc_set_handler(ASM_BOOKE_DEC_VECTOR, C_dispatch_dec_handler_bookE); |
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91 | } else { |
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92 | ppc_exc_set_handler(ASM_DEC_VECTOR, C_dispatch_irq_handler); |
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93 | } |
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94 | |
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95 | return 1; |
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96 | } |
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97 | |
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98 | void bsp_interrupt_vector_enable(rtems_vector_number vector) |
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99 | { |
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100 | bsp_interrupt_assert(bsp_interrupt_is_valid_vector(vector)); |
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101 | BSP_enable_irq_at_pic(vector); |
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102 | } |
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103 | |
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104 | void bsp_interrupt_vector_disable(rtems_vector_number vector) |
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105 | { |
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106 | bsp_interrupt_assert(bsp_interrupt_is_valid_vector(vector)); |
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107 | BSP_disable_irq_at_pic(vector); |
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108 | } |
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109 | |
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110 | rtems_status_code bsp_interrupt_facility_initialize(void) |
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111 | { |
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112 | /* |
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113 | * Initialize RTEMS IRQ system |
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114 | */ |
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115 | BSP_rtems_irq_mng_init(0); |
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116 | return RTEMS_SUCCESSFUL; |
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117 | } |
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