1 | /* |
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2 | * Clock Tick Device Driver |
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3 | * |
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4 | * This routine initializes LEON timer 1 which used for the clock tick. |
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5 | * |
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6 | * The tick frequency is directly programmed to the configured number of |
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7 | * microseconds per tick. |
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8 | * |
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9 | * COPYRIGHT (c) 1989-2006. |
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10 | * On-Line Applications Research Corporation (OAR). |
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11 | * |
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12 | * Modified for LEON3 BSP. |
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13 | * COPYRIGHT (c) 2004. |
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14 | * Gaisler Research. |
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15 | * |
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16 | * The license and distribution terms for this file may be |
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17 | * found in the file LICENSE in this distribution or at |
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18 | * http://www.rtems.com/license/LICENSE. |
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19 | */ |
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20 | |
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21 | #include <bsp.h> |
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22 | #include <bspopts.h> |
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23 | #include <ambapp.h> |
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24 | |
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25 | #if SIMSPARC_FAST_IDLE==1 |
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26 | #define CLOCK_DRIVER_USE_FAST_IDLE 1 |
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27 | #endif |
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28 | |
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29 | /* |
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30 | * The Real Time Clock Counter Timer uses this trap type. |
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31 | */ |
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32 | |
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33 | #if defined(RTEMS_MULTIPROCESSING) |
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34 | #define LEON3_CLOCK_INDEX \ |
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35 | (rtems_configuration_get_user_multiprocessing_table() ? LEON3_Cpu_Index : 0) |
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36 | #else |
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37 | #define LEON3_CLOCK_INDEX 0 |
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38 | #endif |
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39 | |
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40 | volatile struct gptimer_regs *LEON3_Timer_Regs = 0; |
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41 | static int clkirq; |
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42 | |
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43 | #define CLOCK_VECTOR LEON_TRAP_TYPE( clkirq ) |
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44 | |
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45 | #define Clock_driver_support_at_tick() |
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46 | |
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47 | #if defined(RTEMS_MULTIPROCESSING) |
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48 | #define Adjust_clkirq_for_node() \ |
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49 | do { \ |
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50 | if (rtems_configuration_get_user_multiprocessing_table() != NULL) { \ |
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51 | clkirq += LEON3_Cpu_Index; \ |
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52 | } \ |
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53 | } while(0) |
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54 | #else |
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55 | #define Adjust_clkirq_for_node() do { clkirq += LEON3_CLOCK_INDEX; } while(0) |
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56 | #endif |
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57 | |
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58 | #define Clock_driver_support_find_timer() \ |
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59 | do { \ |
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60 | struct ambapp_dev *adev; \ |
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61 | \ |
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62 | /* Find first LEON3 GP Timer */ \ |
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63 | adev = (void *)ambapp_for_each(&ambapp_plb, (OPTIONS_ALL|OPTIONS_APB_SLVS),\ |
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64 | VENDOR_GAISLER, GAISLER_GPTIMER, ambapp_find_by_idx, NULL); \ |
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65 | if (adev) { \ |
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66 | /* Found APB GPTIMER Timer */ \ |
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67 | LEON3_Timer_Regs = (volatile struct gptimer_regs *) \ |
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68 | DEV_TO_APB(adev)->start; \ |
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69 | clkirq = (LEON3_Timer_Regs->cfg & 0xf8) >> 3; \ |
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70 | \ |
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71 | Adjust_clkirq_for_node(); \ |
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72 | } \ |
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73 | } while (0) |
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74 | |
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75 | #define Clock_driver_support_install_isr( _new, _old ) \ |
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76 | do { \ |
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77 | _old = set_vector( _new, CLOCK_VECTOR, 1 ); \ |
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78 | } while(0) |
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79 | |
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80 | #define Clock_driver_support_initialize_hardware() \ |
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81 | do { \ |
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82 | LEON3_Timer_Regs->timer[LEON3_CLOCK_INDEX].reload = \ |
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83 | rtems_configuration_get_microseconds_per_tick() - 1; \ |
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84 | \ |
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85 | LEON3_Timer_Regs->timer[LEON3_CLOCK_INDEX].ctrl = \ |
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86 | LEON3_GPTIMER_EN | LEON3_GPTIMER_RL | \ |
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87 | LEON3_GPTIMER_LD | LEON3_GPTIMER_IRQEN; \ |
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88 | } while (0) |
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89 | |
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90 | #define Clock_driver_support_shutdown_hardware() \ |
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91 | do { \ |
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92 | LEON_Mask_interrupt(LEON_TRAP_TYPE(clkirq)); \ |
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93 | LEON3_Timer_Regs->timer[LEON3_CLOCK_INDEX].ctrl = 0; \ |
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94 | } while (0) |
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95 | |
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96 | static uint32_t bsp_clock_nanoseconds_since_last_tick(void) |
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97 | { |
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98 | uint32_t clicks; |
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99 | uint32_t usecs; |
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100 | |
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101 | if ( !LEON3_Timer_Regs ) |
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102 | return 0; |
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103 | |
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104 | clicks = LEON3_Timer_Regs->timer[LEON3_CLOCK_INDEX].value; |
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105 | |
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106 | if ( LEON_Is_interrupt_pending( clkirq ) ) { |
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107 | clicks = LEON3_Timer_Regs->timer[LEON3_CLOCK_INDEX].value; |
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108 | usecs = (2*rtems_configuration_get_microseconds_per_tick() - clicks); |
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109 | } else { |
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110 | usecs = (rtems_configuration_get_microseconds_per_tick() - clicks); |
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111 | } |
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112 | return usecs * 1000; |
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113 | } |
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114 | |
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115 | #define Clock_driver_nanoseconds_since_last_tick \ |
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116 | bsp_clock_nanoseconds_since_last_tick |
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117 | |
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118 | #include "../../../shared/clockdrv_shell.h" |
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