1 | /* |
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2 | * Timer_init() |
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3 | * |
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4 | * ATTENTION: AS MC68349 has no built-in Timer, the following code doesn't work |
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5 | * in a MC68349. You can't use FIFO full mode for the moment, but |
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6 | * it should be easy to fix this by using an external timer |
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7 | * |
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8 | * Use TIMER 1 for TIMEOUT when using FIFO FULL mode in UART driver |
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9 | * Use TIMER 2 for timing test suites |
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10 | * |
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11 | * Geoffroy Montel |
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12 | * France Telecom - CNET/DSM/TAM/CAT |
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13 | * 4, rue du Clos Courtel |
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14 | * 35512 CESSON-SEVIGNE |
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15 | * FRANCE |
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16 | * |
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17 | * e-mail: g_montel@yahoo.com |
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18 | * |
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19 | * $Id$ |
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20 | */ |
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21 | |
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22 | /* |
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23 | * |
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24 | * Input parameters: NONE |
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25 | * |
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26 | * Output parameters: NONE |
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27 | * |
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28 | * NOTE: It is important that the timer start/stop overhead be |
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29 | * determined when porting or modifying this code. |
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30 | * |
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31 | * COPYRIGHT (c) 1989-1999. |
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32 | * On-Line Applications Research Corporation (OAR). |
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33 | * |
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34 | * The license and distribution terms for this file may be |
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35 | * found in the file LICENSE in this distribution or at |
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36 | * http://www.OARcorp.com/rtems/license.html. |
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37 | */ |
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38 | |
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39 | #include <rtems.h> |
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40 | #include <bsp.h> |
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41 | #include <m340uart.h> |
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42 | #include <m340timer.h> |
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43 | #include <m68340.h> |
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44 | |
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45 | #define TIMER1_VECTOR 122 |
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46 | #define TIMER1_IRQ_LEVEL 5 |
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47 | #define TIMER1_INTERRUPT_ARBITRATION 5 |
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48 | |
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49 | #define TIMER2_VECTOR 123 |
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50 | #define TIMER2_IRQ_LEVEL 4 |
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51 | #define TIMER2_INTERRUPT_ARBITRATION 4 |
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52 | |
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53 | #define CLOCK_SPEED 25 /* in Mhz */ |
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54 | |
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55 | #define max(a,b) (((a)>(b)) ? (a) : (b)) |
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56 | |
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57 | void (*Restart_Fifo_Full_A_Timer)(); |
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58 | void (*Restart_Check_A_Timer)(); |
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59 | void (*Restart_Fifo_Full_B_Timer)(); |
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60 | void (*Restart_Check_B_Timer)(); |
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61 | |
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62 | int preload = 0; |
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63 | |
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64 | /****************************************************** |
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65 | Name: __Restart_Fifo_Full_Timer |
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66 | Input parameters: - |
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67 | Output parameters: - |
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68 | Description: when a character is received, sets |
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69 | the TIMER to raise an interrupt at |
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70 | TIMEOUT. |
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71 | It's necessary to prevent from not |
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72 | getting n-1 characters (with n the |
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73 | Uart Fifo size) |
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74 | *****************************************************/ |
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75 | void __Restart_Fifo_Full_Timer (void) |
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76 | { |
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77 | TSR1 |= m340_TO; |
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78 | TCR1 &= ~m340_CPE; |
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79 | WPREL11 = preload; |
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80 | TCR1 |= m340_CPE; |
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81 | } |
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82 | |
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83 | /****************************************************** |
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84 | Name: __Restart_Fifo_Full_Timer |
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85 | Input parameters: - |
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86 | Output parameters: - |
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87 | Description: when no character has been received |
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88 | recently, check now and then if whether |
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89 | a there's a character in the FIFO |
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90 | *****************************************************/ |
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91 | void __Restart_Check_Timer (void) |
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92 | { |
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93 | TSR1 |= m340_TO; |
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94 | TCR1 &= ~m340_CPE; |
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95 | WPREL11 = 0xFFFF; |
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96 | TCR1 |= m340_CPE; |
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97 | } |
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98 | |
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99 | /****************************************************** |
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100 | Name: __do_nothing |
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101 | Input parameters: - |
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102 | Output parameters: - |
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103 | Description: we always restart the fifo full timer |
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104 | with a call to Restart_*_Timer |
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105 | if we do not use FIFO full, Restart_*_Timer |
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106 | are set to do __do_nothing |
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107 | *****************************************************/ |
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108 | void __do_nothing (void) |
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109 | { |
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110 | } |
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111 | |
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112 | #define Fifo_Full_on_A (m340_uart_config[UART_CHANNEL_A].rx_mode==UART_FIFO_FULL && m340_uart_config[UART_CHANNEL_A].enable && m340_uart_config[UART_CHANNEL_A].mode==UART_INTERRUPTS) |
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113 | #define Fifo_Full_on_B (m340_uart_config[UART_CHANNEL_B].rx_mode==UART_FIFO_FULL && m340_uart_config[UART_CHANNEL_B].enable && m340_uart_config[UART_CHANNEL_B].mode==UART_INTERRUPTS) |
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114 | |
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115 | /****************************************************** |
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116 | Name: Fifo_Full_Timer_initialize |
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117 | Input parameters: - |
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118 | Output parameters: - |
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119 | Description: initialize Timer 1 for FIFO full mode |
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120 | *****************************************************/ |
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121 | void Fifo_Full_Timer_initialize (void) |
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122 | { |
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123 | float max_baud_rate; |
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124 | int prescaler_output_tap = -1; |
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125 | int nb_of_clock_ticks = 0; |
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126 | |
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127 | /* |
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128 | * USE TIMER 1 for UART FIFO FULL mode |
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129 | */ |
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130 | |
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131 | if ( Fifo_Full_on_A || Fifo_Full_on_B ) |
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132 | { |
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133 | /* Disable the timer */ |
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134 | TCR1 &= ~m340_SWR; |
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135 | |
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136 | /* Reset the interrupts */ |
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137 | TSR1 &= ~(m340_TO | m340_TG | m340_TC); |
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138 | |
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139 | /* Init the stop bit for normal operation, ignore FREEZE, user privileges, |
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140 | set interrupt arbitration */ |
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141 | TMCR1 = TIMER1_INTERRUPT_ARBITRATION; |
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142 | |
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143 | /* interrupt priority level and interrupt vector */ |
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144 | TIR1 = TIMER1_VECTOR | (TIMER1_IRQ_LEVEL << 8); |
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145 | |
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146 | /* compute prescaler */ |
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147 | if ( Fifo_Full_on_A && Fifo_Full_on_B) |
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148 | max_baud_rate = max(m340_uart_config[UART_CHANNEL_A].rx_baudrate, m340_uart_config[UART_CHANNEL_B].rx_baudrate); |
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149 | else if ( Fifo_Full_on_A ) |
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150 | max_baud_rate = m340_uart_config[UART_CHANNEL_A].rx_baudrate; |
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151 | else max_baud_rate = m340_uart_config[UART_CHANNEL_B].rx_baudrate; |
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152 | |
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153 | /* find out config */ |
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154 | nb_of_clock_ticks = (10/max_baud_rate)*(CLOCK_SPEED*1000000)*1.2; |
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155 | if (nb_of_clock_ticks < 0xFFFF) { |
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156 | preload = nb_of_clock_ticks; |
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157 | prescaler_output_tap = -1; |
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158 | } else if (nb_of_clock_ticks/2 < 0xFFFF) { |
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159 | preload = nb_of_clock_ticks/2; |
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160 | prescaler_output_tap = m340_Divide_by_2; |
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161 | } else if (nb_of_clock_ticks/4 < 0xFFFF) { |
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162 | preload = nb_of_clock_ticks/4; |
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163 | prescaler_output_tap = m340_Divide_by_4; |
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164 | } else if (nb_of_clock_ticks/8 < 0xFFFF) { |
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165 | preload = nb_of_clock_ticks/8; |
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166 | prescaler_output_tap = m340_Divide_by_16; |
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167 | } else if (nb_of_clock_ticks/16 < 0xFFFF) { |
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168 | preload = nb_of_clock_ticks/16; |
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169 | prescaler_output_tap = m340_Divide_by_16; |
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170 | } else if (nb_of_clock_ticks/32 < 0xFFFF) { |
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171 | preload = nb_of_clock_ticks/32; |
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172 | prescaler_output_tap = m340_Divide_by_32; |
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173 | } else if (nb_of_clock_ticks/64 < 0xFFFF) { |
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174 | preload = nb_of_clock_ticks/64; |
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175 | prescaler_output_tap = m340_Divide_by_64; |
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176 | } else if (nb_of_clock_ticks/128 < 0xFFFF) { |
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177 | preload = nb_of_clock_ticks/128; |
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178 | prescaler_output_tap = m340_Divide_by_128; |
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179 | } else if (nb_of_clock_ticks/256 < 0xFFFF) { |
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180 | preload = nb_of_clock_ticks/256; |
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181 | prescaler_output_tap = m340_Divide_by_256; |
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182 | } |
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183 | |
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184 | /* Input Capture/Output Compare (ICOC) */ |
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185 | TCR1 = m340_SWR | m340_TO_Enabled | m340_ICOC; |
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186 | if (prescaler_output_tap!=-1) TCR1 |= prescaler_output_tap | m340_PSE; |
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187 | |
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188 | /* install interrupt vector */ |
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189 | { |
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190 | rtems_isr_entry old_handler; |
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191 | rtems_status_code sc; |
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192 | |
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193 | extern void _Debug_ISR_Handler_Console(void); |
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194 | |
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195 | sc = rtems_interrupt_catch (InterruptHandler, |
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196 | TIMER1_VECTOR, |
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197 | &old_handler); |
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198 | |
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199 | /* uncomment this if you want to pass control to your own ISR handler |
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200 | it may be usefull to do so to check for performances with an oscilloscope */ |
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201 | /* |
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202 | { |
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203 | proc_ptr ignored; |
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204 | _CPU_ISR_install_raw_handler( TIMER1_VECTOR, _Debug_ISR_Handler_Console, &ignored ); |
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205 | } |
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206 | */ |
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207 | } |
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208 | } /* fifo full mode on a uart */ |
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209 | |
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210 | /* install routines */ |
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211 | Restart_Check_A_Timer = Fifo_Full_on_A ? __Restart_Check_Timer : __do_nothing; |
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212 | Restart_Fifo_Full_A_Timer = Fifo_Full_on_A ? __Restart_Fifo_Full_Timer : __do_nothing; |
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213 | Restart_Check_B_Timer = Fifo_Full_on_B ? __Restart_Check_Timer : __do_nothing; |
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214 | Restart_Fifo_Full_B_Timer = Fifo_Full_on_B ? __Restart_Fifo_Full_Timer : __do_nothing; |
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215 | /* start checking timer */ |
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216 | Restart_Check_A_Timer(); |
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217 | Restart_Check_B_Timer(); |
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218 | } |
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219 | |
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220 | /****************************************************** |
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221 | Name: Timer_initialize |
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222 | Input parameters: - |
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223 | Output parameters: - |
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224 | Description: init Timer for timing test suites |
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225 | *****************************************************/ |
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226 | void Timer_initialize (void) |
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227 | { |
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228 | /* Disable the timer */ |
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229 | TCR2 &= ~m340_SWR; |
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230 | |
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231 | /* Reset the interrupts */ |
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232 | TSR2 &= ~(m340_TO | m340_TG | m340_TC); |
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233 | |
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234 | /* Init the stop bit for normal operation, ignore FREEZE, user privileges, |
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235 | set interrupt arbitration */ |
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236 | TMCR1 = TIMER2_INTERRUPT_ARBITRATION; |
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237 | |
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238 | /* interrupt priority level and interrupt vector */ |
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239 | TIR1 = TIMER2_VECTOR | (TIMER2_IRQ_LEVEL << 8); |
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240 | |
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241 | /* Init the stop bit for normal operation, ignore FREEZE, user privileges, |
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242 | set interrupt arbitration */ |
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243 | TMCR2 = TIMER2_INTERRUPT_ARBITRATION; |
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244 | |
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245 | /* Preload register 1 */ |
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246 | WPREL21 = 0xFFFF; |
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247 | |
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248 | /* Input Capture/Output Compare (ICOC) */ |
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249 | TCR2 = m340_SWR | m340_ICOC | m340_PSE | m340_Divide_by_16 | m340_CPE; |
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250 | } |
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251 | |
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252 | /****************************************************** |
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253 | Name: Read_timer |
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254 | Input parameters: - |
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255 | Output parameters: - |
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256 | Description: Return timer value in microsecond units |
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257 | *****************************************************/ |
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258 | int |
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259 | Read_timer (void) |
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260 | { |
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261 | /* there's CLOCK_SPEED / 16 micro seconds between two timer register decrement */ |
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262 | return (((0xFFFF - TCNTR2) * CLOCK_SPEED) / 16); |
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263 | } |
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264 | |
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265 | /****************************************************** |
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266 | Name: Empty_function |
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267 | Input parameters: - |
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268 | Output parameters: - |
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269 | Description: Empty function call used in loops to |
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270 | measure basic cost of looping |
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271 | in Timing Test Suite. |
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272 | *****************************************************/ |
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273 | rtems_status_code |
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274 | Empty_function (void) |
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275 | { |
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276 | return RTEMS_SUCCESSFUL; |
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277 | } |
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278 | |
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279 | /****************************************************** |
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280 | Name: Set_find_average_overhead |
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281 | Input parameters: - |
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282 | Output parameters: - |
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283 | Description: - |
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284 | *****************************************************/ |
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285 | void |
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286 | Set_find_average_overhead(rtems_boolean find_flag) |
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287 | { |
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288 | } |
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