1 | /* |
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2 | * Cirrus EP7312 Clock driver |
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3 | * |
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4 | * Copyright (c) 2002 by Jay Monkman <jtm@smoothsmoothie.com> |
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5 | * |
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6 | * The license and distribution terms for this file may be |
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7 | * found in the file LICENSE in this distribution or at |
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8 | * |
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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 <ep7312.h> |
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16 | #include <bsp.h> |
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17 | #include <irq.h> |
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18 | |
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19 | #if ON_SKYEYE==1 |
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20 | #define CLOCK_DRIVER_USE_FAST_IDLE |
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21 | #endif |
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22 | |
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23 | rtems_isr Clock_isr(rtems_vector_number vector); |
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24 | static void clock_isr_on(const rtems_irq_connect_data *unused); |
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25 | static void clock_isr_off(const rtems_irq_connect_data *unused); |
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26 | static int clock_isr_is_on(const rtems_irq_connect_data *irq); |
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27 | |
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28 | rtems_irq_connect_data clock_isr_data = {BSP_TC1OI, |
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29 | (rtems_irq_hdl)Clock_isr, |
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30 | NULL, |
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31 | clock_isr_on, |
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32 | clock_isr_off, |
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33 | clock_isr_is_on}; |
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34 | |
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35 | #define CLOCK_VECTOR 0 |
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36 | |
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37 | #define Clock_driver_support_at_tick() \ |
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38 | do { \ |
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39 | *EP7312_TC1EOI = 0xffffffff; \ |
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40 | } while(0) |
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41 | |
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42 | #define Clock_driver_support_install_isr( _new, _old ) \ |
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43 | do { \ |
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44 | (_old) = NULL; /* avoid warning */; \ |
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45 | BSP_install_rtems_irq_handler(&clock_isr_data); \ |
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46 | } while(0) |
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47 | |
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48 | /* |
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49 | * Set up the clock hardware |
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50 | */ |
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51 | #if ON_SKYEYE |
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52 | #define TCD_VALUE \ |
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53 | (rtems_configuration_get_microseconds_per_tick() * 2000)/25000 |
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54 | #else |
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55 | #define TCD_VALUE \ |
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56 | (rtems_configuration_get_microseconds_per_tick() * 2000)/1000000 |
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57 | #endif |
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58 | |
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59 | #define Clock_driver_support_initialize_hardware() \ |
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60 | do { \ |
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61 | *EP7312_SYSCON1 |= EP7312_SYSCON1_TC1_PRESCALE; \ |
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62 | *EP7312_TC1D = TCD_VALUE; \ |
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63 | *EP7312_TC1EOI = 0xFFFFFFFF; \ |
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64 | } while (0) |
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65 | |
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66 | #define Clock_driver_support_shutdown_hardware() \ |
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67 | do { \ |
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68 | BSP_remove_rtems_irq_handler(&clock_isr_data); \ |
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69 | } while (0) |
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70 | |
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71 | /** |
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72 | * Return the nanoseconds since last tick |
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73 | */ |
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74 | uint32_t clock_driver_get_nanoseconds_since_last_tick(void) |
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75 | { |
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76 | return 0; |
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77 | } |
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78 | |
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79 | #define Clock_driver_nanoseconds_since_last_tick \ |
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80 | clock_driver_get_nanoseconds_since_last_tick |
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81 | |
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82 | static void clock_isr_on(const rtems_irq_connect_data *unused) |
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83 | { |
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84 | return; |
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85 | } |
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86 | |
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87 | static void clock_isr_off(const rtems_irq_connect_data *unused) |
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88 | { |
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89 | return; |
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90 | } |
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91 | |
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92 | static int clock_isr_is_on(const rtems_irq_connect_data *irq) |
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93 | { |
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94 | return 1; |
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95 | } |
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96 | |
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97 | #include "../../../shared/clockdrv_shell.h" |
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