1 | /* |
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2 | * S3C2400 clock specific using the System Timer |
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3 | * |
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4 | * This is hardware specific part of the clock driver. At the end of this |
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5 | * file, the generic part of the driver is #included. |
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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 | * |
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10 | * http://www.OARcorp.com/rtems/license.html. |
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11 | * |
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12 | * |
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13 | * $Id$ |
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14 | */ |
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15 | #include <rtems.h> |
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16 | #include <irq.h> |
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17 | #include <bsp.h> |
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18 | #include <s3c2400.h> |
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19 | |
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20 | /* this is defined in ../../../shared/clockdrv_shell.c */ |
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21 | rtems_isr Clock_isr(rtems_vector_number vector); |
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22 | static void clock_isr_on(const rtems_irq_connect_data *unused); |
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23 | static void clock_isr_off(const rtems_irq_connect_data *unused); |
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24 | static int clock_isr_is_on(const rtems_irq_connect_data *irq); |
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25 | |
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26 | /* Replace the first value with the clock's interrupt name. */ |
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27 | rtems_irq_connect_data clock_isr_data = {BSP_INT_TIMER4, |
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28 | (rtems_irq_hdl)Clock_isr, |
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29 | clock_isr_on, |
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30 | clock_isr_off, |
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31 | clock_isr_is_on, |
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32 | 3, /* unused for ARM cpus */ |
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33 | 0 }; /* unused for ARM cpus */ |
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34 | |
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35 | /* If you follow the code, this is never used, so any value |
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36 | * should work |
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37 | */ |
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38 | #define CLOCK_VECTOR 0 |
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39 | |
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40 | |
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41 | /** |
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42 | * When we get the clock interrupt |
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43 | * - clear the interrupt bit? |
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44 | * - restart the timer? |
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45 | */ |
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46 | #define Clock_driver_support_at_tick() \ |
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47 | do { \ |
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48 | ClearPending(BIT_TIMER4); \ |
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49 | } while(0) |
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50 | |
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51 | |
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52 | /** |
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53 | * Installs the clock ISR. You shouldn't need to change this. |
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54 | */ |
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55 | #define Clock_driver_support_install_isr( _new, _old ) \ |
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56 | do { \ |
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57 | BSP_install_rtems_irq_handler(&clock_isr_data); \ |
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58 | } while(0) |
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59 | |
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60 | |
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61 | /** |
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62 | * Initialize the hardware for the clock |
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63 | * - Set the frequency |
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64 | * - enable it |
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65 | * - clear any pending interrupts |
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66 | * |
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67 | * Since you may want the clock always running, you can |
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68 | * enable interrupts here. If you do so, the clock_isr_on(), |
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69 | * clock_isr_off(), and clock_isr_is_on() functions can be |
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70 | * NOPs. |
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71 | */ |
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72 | #define Clock_driver_support_initialize_hardware() \ |
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73 | do { \ |
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74 | uint32_t cr; \ |
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75 | uint32_t freq,m,p,s; \ |
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76 | /* set MUX for Timer4 to 1/16 */ \ |
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77 | cr=rTCFG1 & 0xFFF0FFFF; \ |
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78 | rTCFG1=(cr | (3<<16)); \ |
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79 | /* compute MPLL freq */ \ |
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80 | m = M_MDIV + 8; \ |
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81 | p = M_PDIV + 2; \ |
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82 | s = M_SDIV; \ |
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83 | freq =(BSP_OSC_FREQ * m) / (p << s); \ |
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84 | /* PCLK = MPLL/4 */ \ |
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85 | freq = freq / 4; \ |
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86 | /* set TIMER4 counter, input freq=PLCK/16/16Mhz*/ \ |
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87 | freq = (freq /16)/16; \ |
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88 | rTCNTB4 = ((freq / 1000) * BSP_Configuration.microseconds_per_tick) / 1000; \ |
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89 | /*unmask TIMER4 irq*/ \ |
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90 | rINTMSK&=~BIT_TIMER4; \ |
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91 | /* start TIMER4 with autoreload */ \ |
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92 | cr=rTCON & 0xFF8FFFFF; \ |
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93 | rTCON=(cr|(0x6<<20)); \ |
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94 | rTCON=(cr|(0x5<<20)); \ |
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95 | } while (0) |
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96 | |
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97 | /** |
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98 | * Do whatever you need to shut the clock down and remove the |
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99 | * interrupt handler. Since this normally only gets called on |
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100 | * RTEMS shutdown, you may not need to do anything other than |
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101 | * remove the ISR. |
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102 | */ |
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103 | #define Clock_driver_support_shutdown_hardware() \ |
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104 | do { \ |
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105 | /* Disable timer */ \ |
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106 | BSP_remove_rtems_irq_handler(&clock_isr_data); \ |
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107 | } while (0) |
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108 | |
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109 | /** |
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110 | * Enables clock interrupt. |
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111 | * |
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112 | * If the interrupt is always on, this can be a NOP. |
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113 | */ |
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114 | static void clock_isr_on(const rtems_irq_connect_data *unused) |
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115 | { |
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116 | return; |
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117 | } |
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118 | |
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119 | /** |
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120 | * Disables clock interrupts |
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121 | * |
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122 | * If the interrupt is always on, this can be a NOP. |
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123 | */ |
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124 | static void clock_isr_off(const rtems_irq_connect_data *unused) |
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125 | { |
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126 | return; |
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127 | } |
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128 | |
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129 | /** |
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130 | * Tests to see if clock interrupt is enabled, and returns 1 if so. |
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131 | * If interrupt is not enabled, returns 0. |
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132 | * |
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133 | * If the interrupt is always on, this always returns 1. |
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134 | */ |
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135 | static int clock_isr_is_on(const rtems_irq_connect_data *irq) |
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136 | { |
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137 | return 1; |
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138 | } |
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139 | |
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140 | |
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141 | /* Make sure to include this, and only at the end of the file */ |
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142 | #include "../../../../libbsp/shared/clockdrv_shell.c" |
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