1 | /*===============================================================*\ |
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2 | | Project: RTEMS TQM8xx BSP | |
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3 | +-----------------------------------------------------------------+ |
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4 | | This file has been adapted to MPC8xx by | |
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5 | | Thomas Doerfler <Thomas.Doerfler@embedded-brains.de> | |
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6 | | Copyright (c) 2008 | |
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7 | | Embedded Brains GmbH | |
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8 | | Obere Lagerstr. 30 | |
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9 | | D-82178 Puchheim | |
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10 | | Germany | |
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11 | | rtems@embedded-brains.de | |
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12 | | | |
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13 | | See the other copyright notice below for the original parts. | |
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14 | +-----------------------------------------------------------------+ |
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15 | | The license and distribution terms for this file may be | |
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16 | | found in the file LICENSE in this distribution or at | |
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17 | | | |
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18 | | http://www.rtems.org/license/LICENSE. | |
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19 | | | |
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20 | +-----------------------------------------------------------------+ |
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21 | | this file contains the console driver | |
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22 | \*===============================================================*/ |
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23 | /* |
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24 | * benchmark_timer_initialize() |
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25 | * |
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26 | * Use TIMER 1 and TIMER 2 for Timing Test Suite |
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27 | * |
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28 | * this is derived from "timer.c" available in the m68k/gen68360 BSP |
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29 | * adapted by Thomas Doerfler <Thomas.Doerfler@embedded-brains.de> |
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30 | */ |
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31 | |
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32 | /* |
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33 | * |
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34 | * Input parameters: NONE |
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35 | * |
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36 | * Output parameters: NONE |
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37 | * |
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38 | * NOTE: It is important that the timer start/stop overhead be |
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39 | * determined when porting or modifying this code. |
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40 | * |
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41 | * COPYRIGHT (c) 1989-1999. |
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42 | * On-Line Applications Research Corporation (OAR). |
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43 | * |
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44 | * The license and distribution terms for this file may be |
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45 | * found in the file LICENSE in this distribution or at |
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46 | * http://www.rtems.org/license/LICENSE. |
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47 | */ |
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48 | |
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49 | #include <rtems.h> |
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50 | #include <bsp.h> |
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51 | #include <rtems/btimer.h> |
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52 | #include <mpc8xx.h> |
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53 | |
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54 | bool benchmark_timer_find_average_overhead; |
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55 | |
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56 | void |
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57 | benchmark_timer_initialize (void) |
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58 | { |
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59 | /* |
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60 | * Reset timers 1 and 2 |
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61 | */ |
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62 | m8xx.tgcr &= ~0x00FF; |
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63 | m8xx.tcn1 = 0; |
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64 | m8xx.tcn2 = 0; |
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65 | m8xx.ter1 = 0xFFFF; |
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66 | m8xx.ter2 = 0xFFFF; |
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67 | |
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68 | /* |
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69 | * Cascade timers 1 and 2 |
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70 | */ |
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71 | m8xx.tgcr |= M8xx_TGCR_CAS2; |
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72 | |
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73 | /* |
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74 | * Configure timers 1 and 2 to a single 32-bit, BUS_clock timer. |
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75 | */ |
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76 | m8xx.tmr2 = (0 << 8) | 0x2; |
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77 | m8xx.tmr1 = 0; |
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78 | |
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79 | /* |
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80 | * Start the timers |
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81 | */ |
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82 | m8xx.tgcr |= 0x0011; |
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83 | } |
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84 | |
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85 | /* |
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86 | * Return timer value in microsecond units |
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87 | */ |
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88 | benchmark_timer_t benchmark_timer_read(void) |
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89 | { |
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90 | uint32_t retval; |
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91 | retval = *(uint32_t*)&m8xx.tcn1; |
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92 | retval = retval * 1000000LL / BSP_bus_frequency; |
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93 | return retval; |
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94 | } |
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95 | |
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96 | void benchmark_timer_disable_subtracting_average_overhead( |
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97 | bool find_flag |
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98 | ) |
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99 | { |
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100 | benchmark_timer_find_average_overhead = find_flag; |
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101 | } |
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