From 28fa54d9b9e30d782115d65456e4cd3d8b8fb6f2 Mon Sep 17 00:00:00 2001 From: Joel Sherrill Date: Fri, 24 May 1996 20:34:49 +0000 Subject: added Motorola MVME147 BSP submitted by Dominique le Campion (Dominique.LECAMPION@enst-bretagne.fr), for Telecom Bretagne and T.N.I. (Brest, France) --- c/src/lib/libbsp/m68k/mvme147/clock/ckinit.c | 142 +++++++++++++++++++++++++++ 1 file changed, 142 insertions(+) create mode 100644 c/src/lib/libbsp/m68k/mvme147/clock/ckinit.c (limited to 'c/src/lib/libbsp/m68k/mvme147/clock/ckinit.c') diff --git a/c/src/lib/libbsp/m68k/mvme147/clock/ckinit.c b/c/src/lib/libbsp/m68k/mvme147/clock/ckinit.c new file mode 100644 index 0000000000..d7fd5ddff2 --- /dev/null +++ b/c/src/lib/libbsp/m68k/mvme147/clock/ckinit.c @@ -0,0 +1,142 @@ +/* Clock_init() + * + * This routine initializes the Tick Timer 2 on the MVME147 board. + * The tick frequency is 1 millisecond. + * + * Input parameters: NONE + * + * Output parameters: NONE + * + * COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994. + * On-Line Applications Research Corporation (OAR). + * All rights assigned to U.S. Government, 1994. + * + * This material may be reproduced by or for the U.S. Government pursuant + * to the copyright license under the clause at DFARS 252.227-7013. This + * notice must appear in all copies of this file and its derivatives. + * + * MVME147 port for TNI - Telecom Bretagne + * by Dominique LE CAMPION (Dominique.LECAMPION@enst-bretagne.fr) + * May 1996 + * + * $Id$ + */ + +#include + +#include +#include + +#define MS_COUNT 65376 /* 1ms */ +/* MS_COUNT = 0x10000 - 1e-3/6.25e-6 */ +#define CLOCK_INT_LEVEL 6 /* T2's interrupt level */ + +rtems_unsigned32 Clock_isrs; /* ISRs until next tick */ +volatile rtems_unsigned32 Clock_driver_ticks; /* ticks since initialization */ +rtems_isr_entry Old_ticker; + +void Clock_exit( void ); + +/* + * These are set by clock driver during its init + */ + +rtems_device_major_number rtems_clock_major = ~0; +rtems_device_minor_number rtems_clock_minor; + + +/* + * ISR Handler + */ + +rtems_isr Clock_isr(rtems_vector_number vector) +{ + Clock_driver_ticks += 1; + pcc->timer2_int_control |= 0x80; /* Acknowledge interr. */ + + if (Clock_isrs == 1) { + rtems_clock_tick(); + Clock_isrs = BSP_Configuration.microseconds_per_tick / 1000; + } + else + Clock_isrs -= 1; +} + +void Install_clock(rtems_isr_entry clock_isr ) +{ + + Clock_driver_ticks = 0; + Clock_isrs = BSP_Configuration.microseconds_per_tick / 1000; + + if ( BSP_Configuration.ticks_per_timeslice ) { + Old_ticker = + (rtems_isr_entry) set_vector( clock_isr, TIMER_2_VECTOR, 1 ); + + pcc->timer2_int_control = 0x00; /* Disable T2 Interr. */ + pcc->timer2_preload = MS_COUNT; + /* write preload value */ + pcc->timer2_control = 0x07; /* clear T2 overflow counter, enable counter */ + pcc->timer2_int_control = CLOCK_INT_LEVEL|0x08; + /* Enable Timer 2 and set its int. level */ + + atexit( Clock_exit ); + } +} + +void Clock_exit( void ) +{ + if ( BSP_Configuration.ticks_per_timeslice ) { + pcc->timer2_int_control = 0x00; /* Disable T2 Interr. */ + } +} + +rtems_device_driver Clock_initialize( + rtems_device_major_number major, + rtems_device_minor_number minor, + void *pargp +) +{ + Install_clock( Clock_isr ); + + /* + * make major/minor avail to others such as shared memory driver + */ + + rtems_clock_major = major; + rtems_clock_minor = minor; + + return RTEMS_SUCCESSFUL; +} + +rtems_device_driver Clock_control( + rtems_device_major_number major, + rtems_device_minor_number minor, + void *pargp +) +{ + rtems_unsigned32 isrlevel; + rtems_libio_ioctl_args_t *args = pargp; + + if (args == 0) + goto done; + + /* + * This is hokey, but until we get a defined interface + * to do this, it will just be this simple... + */ + + if (args->command == rtems_build_name('I', 'S', 'R', ' ')) + { + Clock_isr(TIMER_2_VECTOR); + } + else if (args->command == rtems_build_name('N', 'E', 'W', ' ')) + { + rtems_interrupt_disable( isrlevel ); + (void) set_vector( args->buffer, TIMER_2_VECTOR, 1 ); + rtems_interrupt_enable( isrlevel ); + } + +done: + return RTEMS_SUCCESSFUL; +} + -- cgit v1.2.3