1 | /** |
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2 | * @file clock.c |
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3 | * |
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4 | * @ingroup tms570 |
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5 | * |
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6 | * @brief clock functions definitions. |
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7 | */ |
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8 | |
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9 | /* |
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10 | * Copyright (c) 2014 Premysl Houdek <kom541000@gmail.com> |
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11 | * |
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12 | * Google Summer of Code 2014 at |
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13 | * Czech Technical University in Prague |
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14 | * Zikova 1903/4 |
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15 | * 166 36 Praha 6 |
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16 | * Czech Republic |
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17 | * |
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18 | * Based on LPC24xx and LPC1768 BSP |
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19 | * by embedded brains GmbH and others |
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20 | * |
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21 | * The license and distribution terms for this file may be |
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22 | * found in the file LICENSE in this distribution or at |
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23 | * http://www.rtems.org/license/LICENSE. |
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24 | */ |
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25 | |
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26 | #include <stdlib.h> |
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27 | |
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28 | #include <rtems.h> |
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29 | #include <bsp.h> |
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30 | #include <bsp/irq.h> |
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31 | #include <bsp/tms570-rti.h> |
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32 | |
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33 | /** |
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34 | * holds HW counter value since last interrupt event |
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35 | * sets in tms570_clock_driver_support_at_tick |
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36 | * used in tms570_clock_driver_nanoseconds_since_last_tick |
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37 | */ |
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38 | static uint32_t tms570_rti_last_tick_fcr0; |
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39 | |
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40 | /** |
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41 | * @brief Initialize the HW peripheral for clock driver |
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42 | * |
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43 | * Clock driver is implemented by RTI module |
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44 | * |
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45 | * @retval Void |
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46 | */ |
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47 | static void tms570_clock_driver_support_initialize_hardware( void ) |
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48 | { |
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49 | |
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50 | uint32_t microsec_per_tick = rtems_configuration_get_microseconds_per_tick(); |
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51 | |
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52 | /* Hardware specific initialize */ |
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53 | TMS570_RTI.RTIGCTRL = 0; |
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54 | TMS570_RTI.RTICPUC0 = BSP_PLL_OUT_CLOCK /1000000 / 2; /* prescaler */ |
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55 | TMS570_RTI.RTITBCTRL = 2; |
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56 | TMS570_RTI.RTICAPCTRL = 0; |
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57 | TMS570_RTI.RTICOMPCTRL = 0; |
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58 | /* set counter to zero */ |
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59 | TMS570_RTI.RTIUC0 = 0; |
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60 | TMS570_RTI.RTIFRC0 = 0; |
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61 | /* clear interrupts*/ |
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62 | TMS570_RTI.RTICLEARINTENA = 0x00070f0f; |
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63 | TMS570_RTI.RTIINTFLAG = 0x0007000f; |
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64 | /* set timer */ |
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65 | TMS570_RTI.RTICOMP0 = TMS570_RTI.RTIFRC0 + microsec_per_tick; |
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66 | TMS570_RTI.RTICOMP0CLR = TMS570_RTI.RTICOMP0 + microsec_per_tick / 2; |
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67 | TMS570_RTI.RTIUDCP0 = microsec_per_tick; |
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68 | /* enable interupt */ |
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69 | TMS570_RTI.RTISETINTENA = 0x1; |
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70 | /* enable timer */ |
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71 | TMS570_RTI.RTIGCTRL = 1; |
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72 | } |
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73 | |
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74 | /** |
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75 | * @brief Clears interrupt source |
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76 | * |
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77 | * @retval Void |
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78 | */ |
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79 | static void tms570_clock_driver_support_at_tick( void ) |
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80 | { |
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81 | TMS570_RTI.RTIINTFLAG = 0x00000001; |
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82 | tms570_rti_last_tick_fcr0 = TMS570_RTI.RTICOMP0 - TMS570_RTI.RTIUDCP0; |
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83 | /* TMS570_RTI.RTICOMP0 += 1000; */ |
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84 | } |
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85 | |
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86 | /** |
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87 | * @brief registers RTI interrupt handler |
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88 | * |
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89 | * @param[in] Clock_isr new ISR handler |
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90 | * @param[in] Old_ticker old ISR handler (unused and type broken) |
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91 | * |
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92 | * @retval Void |
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93 | */ |
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94 | static void tms570_clock_driver_support_install_isr( |
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95 | rtems_isr_entry Clock_isr |
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96 | ) |
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97 | { |
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98 | rtems_status_code sc = RTEMS_SUCCESSFUL; |
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99 | |
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100 | sc = rtems_interrupt_handler_install( |
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101 | TMS570_IRQ_TIMER_0, |
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102 | "Clock", |
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103 | RTEMS_INTERRUPT_UNIQUE, |
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104 | (rtems_interrupt_handler) Clock_isr, |
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105 | NULL |
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106 | ); |
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107 | if ( sc != RTEMS_SUCCESSFUL ) { |
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108 | rtems_fatal_error_occurred(0xdeadbeef); |
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109 | } |
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110 | } |
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111 | |
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112 | /** |
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113 | * @brief disables RTI interrupt |
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114 | * |
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115 | * Called when closing clock driver |
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116 | * |
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117 | * @retval Void |
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118 | */ |
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119 | static void tms570_clock_driver_support_shutdown_hardware( void ) |
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120 | { |
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121 | /* turn off the timer interrupts */ |
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122 | TMS570_RTI.RTICLEARINTENA = 0x20000; |
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123 | } |
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124 | |
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125 | /** |
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126 | * @brief returns the nanoseconds since last tick |
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127 | * |
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128 | * Return the nanoseconds since last tick |
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129 | * |
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130 | * @retval x nanoseconds |
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131 | * |
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132 | */ |
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133 | static uint32_t tms570_clock_driver_nanoseconds_since_last_tick( void ) |
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134 | { |
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135 | uint32_t actual_fcr0 = TMS570_RTI.RTIFRC0; |
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136 | uint32_t usec_since_tick; |
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137 | |
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138 | usec_since_tick = actual_fcr0 - tms570_rti_last_tick_fcr0; |
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139 | |
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140 | return usec_since_tick * 1000; |
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141 | } |
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142 | |
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143 | #define Clock_driver_support_initialize_hardware \ |
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144 | tms570_clock_driver_support_initialize_hardware |
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145 | #define Clock_driver_support_at_tick \ |
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146 | tms570_clock_driver_support_at_tick |
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147 | #define Clock_driver_support_initialize_hardware \ |
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148 | tms570_clock_driver_support_initialize_hardware |
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149 | #define Clock_driver_support_shutdown_hardware \ |
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150 | tms570_clock_driver_support_shutdown_hardware |
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151 | #define Clock_driver_nanoseconds_since_last_tick \ |
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152 | tms570_clock_driver_nanoseconds_since_last_tick |
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153 | |
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154 | #define Clock_driver_support_install_isr(Clock_isr, Old_ticker ) \ |
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155 | tms570_clock_driver_support_install_isr( Clock_isr ) |
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156 | |
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157 | void Clock_isr(void *arg); /* to supress warning */ |
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158 | |
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159 | #include "../../../shared/clockdrv_shell.h" |
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