[132f194] | 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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[08311cc3] | 31 | * COPYRIGHT (c) 1989-1999. |
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[132f194] | 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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[b5bb3d6] | 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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[132f194] | 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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