1 | /** |
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2 | * @file clockdrv.c |
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3 | * |
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4 | * Game Boy Advance Clock driver. |
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5 | */ |
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6 | /* |
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7 | * RTEMS GBA BSP |
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8 | * |
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9 | * Copyright (c) 2004 Markku Puro <markku.puro@kopteri.net> |
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10 | * |
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11 | * The license and distribution terms for this file may be |
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12 | * found in found in the file LICENSE in this distribution or at |
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13 | * http://www.rtems.com/license/LICENSE. |
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14 | * |
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15 | * $Id$ |
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16 | */ |
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17 | |
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18 | #include <rtems.h> |
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19 | #include <bsp.h> |
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20 | #include <irq.h> |
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21 | #include <gba.h> |
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22 | |
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23 | |
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24 | /*-------------------------------------------------------------------------+ |
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25 | | Clock isr variables |
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26 | +--------------------------------------------------------------------------*/ |
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27 | rtems_isr Clock_isr(rtems_vector_number vector); |
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28 | static void clock_isr_on(const rtems_irq_connect_data *unused); |
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29 | static void clock_isr_off(const rtems_irq_connect_data *unused); |
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30 | static int clock_isr_is_on(const rtems_irq_connect_data *irq); |
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31 | |
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32 | rtems_irq_connect_data clock_isr_data = {BSP_IRQ_TIMER3, |
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33 | (rtems_irq_hdl)Clock_isr, |
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34 | clock_isr_on, |
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35 | clock_isr_off, |
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36 | clock_isr_is_on, |
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37 | 0, |
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38 | 0 }; |
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39 | |
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40 | #define CLOCK_VECTOR 0 |
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41 | |
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42 | #define Clock_driver_support_at_tick() |
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43 | |
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44 | #define Clock_driver_support_install_isr( _new, _old ) \ |
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45 | do { \ |
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46 | BSP_install_rtems_irq_handler(&clock_isr_data); \ |
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47 | } while(0) |
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48 | |
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49 | #define Clock_driver_support_shutdown_hardware() \ |
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50 | do { \ |
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51 | BSP_remove_rtems_irq_handler(&clock_isr_data); \ |
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52 | } while (0) |
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53 | |
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54 | |
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55 | /*-------------------------------------------------------------------------+ |
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56 | | Calculate Tick Times |
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57 | | 1 / 16.78Mhz => 59.595 ns |
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58 | | 64 / 16.78Mhz => 3.814 us |
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59 | | 256 / 16.78Mhz => 15.256 us |
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60 | | 1024 / 16.78Mhz => 61.025 us |
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61 | +--------------------------------------------------------------------------*/ |
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62 | #define __TimTickTime_us ((1000000L/__ClockFrequency)*__TimPreScaler) |
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63 | #define __TimTickTime_ns ((1000000000L/__ClockFrequency)*__TimPreScaler) |
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64 | |
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65 | #if (__TimPreScaler==1) |
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66 | #define GBA_TMCNT_PS 0x0000 |
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67 | #elif (__TimPreScaler==64) |
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68 | #define GBA_TMCNT_PS 0x0001 |
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69 | #elif (__TimPreScaler==256) |
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70 | #define GBA_TMCNT_PS 0x0002 |
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71 | #elif (__TimPreScaler==1024) |
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72 | #define GBA_TMCNT_PS 0x0003 |
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73 | #else |
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74 | #define GBA_TMCNT_PS 0x0003 |
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75 | #endif |
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76 | |
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77 | /** |
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78 | * @brief This function set up the clock hardware |
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79 | * |
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80 | * @param None |
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81 | * @return None |
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82 | */ |
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83 | void Clock_driver_support_initialize_hardware(void) |
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84 | { |
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85 | int tmreload = ((rtems_configuration_get_microseconds_per_tick()*1000)/__TimTickTime_ns); |
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86 | |
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87 | if (tmreload>0xFFFF) tmreload = 0xFFFF; |
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88 | GBA_REG_TM3CNT = (GBA_TMCNT_PS); |
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89 | GBA_REG_TM3D = (0x0000-tmreload); |
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90 | GBA_REG_TM3CNT = (0x00c0|GBA_TMCNT_PS); |
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91 | } |
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92 | |
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93 | /** |
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94 | * @brief This function is empty |
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95 | * |
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96 | * @param unused an unused parameter |
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97 | * @return None |
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98 | */ |
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99 | static void clock_isr_on(const rtems_irq_connect_data *unused) |
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100 | { |
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101 | return; |
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102 | } |
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103 | |
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104 | /** |
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105 | * @brief This function is empty |
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106 | * |
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107 | * @param unused an unused parameter |
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108 | * @return None |
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109 | */ |
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110 | static void clock_isr_off(const rtems_irq_connect_data *unused) |
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111 | { |
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112 | return; |
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113 | } |
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114 | |
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115 | /** |
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116 | * @brief This function is empty |
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117 | * |
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118 | * @param irq unused |
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119 | * @return constant 1 |
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120 | */ |
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121 | static int clock_isr_is_on(const rtems_irq_connect_data *irq) |
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122 | { |
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123 | return 1; |
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124 | } |
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125 | |
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126 | |
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127 | #include "../../../shared/clockdrv_shell.c" |
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