1 | /* |
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2 | * By Yang Xi <hiyangxi@gmail.com> |
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3 | * PXA255 clock specific using the System Timer |
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4 | * |
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5 | * RTEMS uses IRQ 26 as Clock Source |
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6 | * |
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7 | * The license and distribution terms for this file may be |
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8 | * found in the file LICENSE in this distribution or at |
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9 | * http://www.rtems.com/license/LICENSE. |
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10 | * |
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11 | * |
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12 | * $Id$ |
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13 | */ |
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14 | #include <rtems.h> |
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15 | #include <rtems/clockdrv.h> |
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16 | #include <rtems/libio.h> |
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17 | |
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18 | #include <stdlib.h> |
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19 | #include <bsp.h> |
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20 | #include <irq.h> |
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21 | #include <pxa255.h> |
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22 | |
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23 | |
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24 | |
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25 | static unsigned long period_num; |
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26 | |
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27 | |
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28 | |
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29 | |
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30 | |
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31 | /** |
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32 | * Enables clock interrupt. |
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33 | * |
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34 | * If the interrupt is always on, this can be a NOP. |
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35 | */ |
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36 | static void clock_isr_on(const rtems_irq_connect_data *unused) |
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37 | { |
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38 | |
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39 | /*Clear the interrupt bit */ |
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40 | XSCALE_OS_TIMER_TSR = 0x1; |
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41 | |
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42 | |
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43 | /* enable timer interrupt */ |
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44 | XSCALE_OS_TIMER_IER |= 0x1; |
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45 | |
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46 | period_num = TIMER_RATE*(Configuration.microseconds_per_tick/10000); |
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47 | |
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48 | XSCALE_OS_TIMER_MR0 = XSCALE_OS_TIMER_TCR + period_num; |
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49 | |
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50 | } |
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51 | |
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52 | /** |
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53 | * Disables clock interrupts |
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54 | * |
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55 | * If the interrupt is always on, this can be a NOP. |
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56 | */ |
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57 | static void clock_isr_off(const rtems_irq_connect_data *unused) |
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58 | { |
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59 | /*Clear the interrupt bit */ |
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60 | XSCALE_OS_TIMER_TSR = 0x1; |
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61 | /* disable timer interrupt*/ |
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62 | XSCALE_OS_TIMER_IER &= ~0x1; |
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63 | return; |
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64 | } |
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65 | |
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66 | /** |
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67 | * Tests to see if clock interrupt is enabled, and returns 1 if so. |
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68 | * If interrupt is not enabled, returns 0. |
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69 | * |
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70 | * If the interrupt is always on, this always returns 1. |
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71 | */ |
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72 | static int clock_isr_is_on(const rtems_irq_connect_data *irq) |
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73 | { |
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74 | /* check timer interrupt */ |
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75 | return XSCALE_OS_TIMER_IER & 0x1; |
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76 | } |
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77 | |
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78 | rtems_isr Clock_isr(rtems_vector_number vector); |
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79 | |
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80 | /* Replace the first value with the clock's interrupt name. */ |
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81 | rtems_irq_connect_data clock_isr_data = {XSCALE_IRQ_OS_TIMER, |
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82 | (rtems_irq_hdl)Clock_isr, |
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83 | clock_isr_on, |
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84 | clock_isr_off, |
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85 | clock_isr_is_on, |
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86 | 3, /* unused for ARM cpus */ |
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87 | 0 }; /* unused for ARM cpus */ |
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88 | |
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89 | |
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90 | #define Clock_driver_support_install_isr( _new, _old ) \ |
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91 | BSP_install_rtems_irq_handler(&clock_isr_data) |
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92 | |
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93 | void Clock_driver_support_initialize_hardware(void) |
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94 | { |
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95 | |
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96 | |
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97 | period_num = TIMER_RATE*(Configuration.microseconds_per_tick/10000); |
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98 | |
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99 | } |
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100 | |
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101 | |
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102 | #define CLOCK_VECTOR 0 |
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103 | |
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104 | #define Clock_driver_support_at_tick() \ |
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105 | do { \ |
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106 | ;\ |
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107 | XSCALE_OS_TIMER_TSR = 0x1;/* read the status to clear the int */ \ |
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108 | XSCALE_OS_TIMER_MR0 = XSCALE_OS_TIMER_TCR + period_num;/*Add the match register*/ \ |
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109 | ;\ |
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110 | } while (0) |
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111 | |
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112 | void Clock_driver_support_shutdown_hardware( void ) |
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113 | { |
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114 | BSP_remove_rtems_irq_handler(&clock_isr_data); |
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115 | } |
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116 | |
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117 | #include "../../../../libbsp/shared/clockdrv_shell.h" |
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