[28fa54d9] | 1 | /* Clock_init() |
---|
| 2 | * |
---|
| 3 | * This routine initializes the Tick Timer 2 on the MVME147 board. |
---|
| 4 | * The tick frequency is 1 millisecond. |
---|
| 5 | * |
---|
| 6 | * Input parameters: NONE |
---|
| 7 | * |
---|
| 8 | * Output parameters: NONE |
---|
| 9 | * |
---|
[08311cc3] | 10 | * COPYRIGHT (c) 1989-1999. |
---|
[28fa54d9] | 11 | * On-Line Applications Research Corporation (OAR). |
---|
| 12 | * |
---|
[98e4ebf5] | 13 | * The license and distribution terms for this file may be |
---|
| 14 | * found in the file LICENSE in this distribution or at |
---|
[03f2154e] | 15 | * http://www.OARcorp.com/rtems/license.html. |
---|
[28fa54d9] | 16 | * |
---|
| 17 | * MVME147 port for TNI - Telecom Bretagne |
---|
| 18 | * by Dominique LE CAMPION (Dominique.LECAMPION@enst-bretagne.fr) |
---|
| 19 | * May 1996 |
---|
| 20 | * |
---|
| 21 | * $Id$ |
---|
| 22 | */ |
---|
| 23 | |
---|
| 24 | #include <stdlib.h> |
---|
| 25 | |
---|
| 26 | #include <bsp.h> |
---|
| 27 | #include <rtems/libio.h> |
---|
| 28 | |
---|
| 29 | #define MS_COUNT 65376 /* 1ms */ |
---|
| 30 | /* MS_COUNT = 0x10000 - 1e-3/6.25e-6 */ |
---|
| 31 | #define CLOCK_INT_LEVEL 6 /* T2's interrupt level */ |
---|
| 32 | |
---|
| 33 | rtems_unsigned32 Clock_isrs; /* ISRs until next tick */ |
---|
| 34 | volatile rtems_unsigned32 Clock_driver_ticks; /* ticks since initialization */ |
---|
| 35 | rtems_isr_entry Old_ticker; |
---|
| 36 | |
---|
| 37 | void Clock_exit( void ); |
---|
| 38 | |
---|
| 39 | /* |
---|
| 40 | * These are set by clock driver during its init |
---|
| 41 | */ |
---|
| 42 | |
---|
| 43 | rtems_device_major_number rtems_clock_major = ~0; |
---|
| 44 | rtems_device_minor_number rtems_clock_minor; |
---|
| 45 | |
---|
| 46 | |
---|
| 47 | /* |
---|
| 48 | * ISR Handler |
---|
| 49 | */ |
---|
| 50 | |
---|
| 51 | rtems_isr Clock_isr(rtems_vector_number vector) |
---|
| 52 | { |
---|
| 53 | Clock_driver_ticks += 1; |
---|
| 54 | pcc->timer2_int_control |= 0x80; /* Acknowledge interr. */ |
---|
| 55 | |
---|
| 56 | if (Clock_isrs == 1) { |
---|
| 57 | rtems_clock_tick(); |
---|
| 58 | Clock_isrs = BSP_Configuration.microseconds_per_tick / 1000; |
---|
| 59 | } |
---|
| 60 | else |
---|
| 61 | Clock_isrs -= 1; |
---|
| 62 | } |
---|
| 63 | |
---|
| 64 | void Install_clock(rtems_isr_entry clock_isr ) |
---|
| 65 | { |
---|
| 66 | |
---|
| 67 | Clock_driver_ticks = 0; |
---|
| 68 | Clock_isrs = BSP_Configuration.microseconds_per_tick / 1000; |
---|
| 69 | |
---|
[0dd1d44] | 70 | Old_ticker = (rtems_isr_entry) set_vector( clock_isr, TIMER_2_VECTOR, 1 ); |
---|
[28fa54d9] | 71 | |
---|
[0dd1d44] | 72 | pcc->timer2_int_control = 0x00; /* Disable T2 Interr. */ |
---|
| 73 | pcc->timer2_preload = MS_COUNT; |
---|
| 74 | /* write preload value */ |
---|
| 75 | pcc->timer2_control = 0x07; /* clear T2 overflow counter, enable counter */ |
---|
| 76 | pcc->timer2_int_control = CLOCK_INT_LEVEL|0x08; |
---|
| 77 | /* Enable Timer 2 and set its int. level */ |
---|
[28fa54d9] | 78 | |
---|
[0dd1d44] | 79 | atexit( Clock_exit ); |
---|
[28fa54d9] | 80 | } |
---|
| 81 | |
---|
| 82 | void Clock_exit( void ) |
---|
| 83 | { |
---|
[0dd1d44] | 84 | pcc->timer2_int_control = 0x00; /* Disable T2 Interr. */ |
---|
[28fa54d9] | 85 | } |
---|
| 86 | |
---|
| 87 | rtems_device_driver Clock_initialize( |
---|
| 88 | rtems_device_major_number major, |
---|
| 89 | rtems_device_minor_number minor, |
---|
| 90 | void *pargp |
---|
| 91 | ) |
---|
| 92 | { |
---|
| 93 | Install_clock( Clock_isr ); |
---|
| 94 | |
---|
| 95 | /* |
---|
| 96 | * make major/minor avail to others such as shared memory driver |
---|
| 97 | */ |
---|
| 98 | |
---|
| 99 | rtems_clock_major = major; |
---|
| 100 | rtems_clock_minor = minor; |
---|
| 101 | |
---|
| 102 | return RTEMS_SUCCESSFUL; |
---|
| 103 | } |
---|
| 104 | |
---|
| 105 | rtems_device_driver Clock_control( |
---|
| 106 | rtems_device_major_number major, |
---|
| 107 | rtems_device_minor_number minor, |
---|
| 108 | void *pargp |
---|
| 109 | ) |
---|
| 110 | { |
---|
| 111 | rtems_unsigned32 isrlevel; |
---|
| 112 | rtems_libio_ioctl_args_t *args = pargp; |
---|
| 113 | |
---|
| 114 | if (args == 0) |
---|
| 115 | goto done; |
---|
| 116 | |
---|
| 117 | /* |
---|
| 118 | * This is hokey, but until we get a defined interface |
---|
| 119 | * to do this, it will just be this simple... |
---|
| 120 | */ |
---|
| 121 | |
---|
| 122 | if (args->command == rtems_build_name('I', 'S', 'R', ' ')) |
---|
| 123 | { |
---|
| 124 | Clock_isr(TIMER_2_VECTOR); |
---|
| 125 | } |
---|
| 126 | else if (args->command == rtems_build_name('N', 'E', 'W', ' ')) |
---|
| 127 | { |
---|
| 128 | rtems_interrupt_disable( isrlevel ); |
---|
| 129 | (void) set_vector( args->buffer, TIMER_2_VECTOR, 1 ); |
---|
| 130 | rtems_interrupt_enable( isrlevel ); |
---|
| 131 | } |
---|
| 132 | |
---|
| 133 | done: |
---|
| 134 | return RTEMS_SUCCESSFUL; |
---|
| 135 | } |
---|
| 136 | |
---|