diff options
Diffstat (limited to 'c/src/lib/libbsp/m68k/dmv152/clock/ckinit.c')
-rw-r--r-- | c/src/lib/libbsp/m68k/dmv152/clock/ckinit.c | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/c/src/lib/libbsp/m68k/dmv152/clock/ckinit.c b/c/src/lib/libbsp/m68k/dmv152/clock/ckinit.c new file mode 100644 index 0000000000..c9fa0b7efc --- /dev/null +++ b/c/src/lib/libbsp/m68k/dmv152/clock/ckinit.c @@ -0,0 +1,162 @@ +/* Clock_init() + * + * This routine initializes the Z80386 1 on the MVME136 board. + * The tick frequency is 1 millisecond. + * + * Input parameters: NONE + * + * Output parameters: NONE + * + * COPYRIGHT (c) 1989-1997. + * On-Line Applications Research Corporation (OAR). + * Copyright assigned to U.S. Government, 1994. + * + * The license and distribution terms for this file may in + * the file LICENSE in this distribution or at + * http://www.OARcorp.com/rtems/license.html. + * + * $Id$ + */ + +#include <stdlib.h> + +#include <bsp.h> +#include <rtems/libio.h> + +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 ); + +#define CLOCK_VECTOR TIMER_VECTOR + +/* + * 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; + + Z8x36_WRITE( TIMER, CT1_CMD_STATUS, 0xE2 ); + Z8x36_WRITE( TIMER, CT1_CMD_STATUS, 0x22 ); + Z8x36_WRITE( TIMER, CT1_CMD_STATUS, 0xC6 ); + + 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 +) +{ + rtems_unsigned8 data; + + 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, CLOCK_VECTOR, 1 ); + + Z8x36_WRITE( TIMER, MASTER_CFG, 0xd4 ); + Z8x36_READ ( TIMER, MASTER_INTR, data ); + Z8x36_WRITE( TIMER, MASTER_INTR, (data & 0x7E) ); + Z8x36_WRITE( TIMER, CT1_TIME_CONST_MSB, 0x04 ); + Z8x36_WRITE( TIMER, CT1_TIME_CONST_LSB, 0xCE ); + Z8x36_WRITE( TIMER, CT1_MODE_SPEC, 0x83 ); + Z8x36_WRITE( TIMER, CNT_TMR_VECTOR, CLOCK_VECTOR ); + Z8x36_WRITE( TIMER, CT1_CMD_STATUS, 0x20 ); + Z8x36_READ ( TIMER, MASTER_INTR, data ); + Z8x36_WRITE( TIMER, MASTER_INTR, (data & 0xDA) | 0x80 ); + + /* + * ACC_IC54 - interrupt 5 will be vectored and mapped to level 6 + */ + + data = (*(rtems_unsigned8 *)0x0D00000B); + (*(rtems_unsigned8 *)0x0D00000B) = (data & 0x7F) | 0x60; + + Z8x36_WRITE( TIMER, CT1_CMD_STATUS, 0xC6 ); + + atexit( Clock_exit ); + } +} + +void Clock_exit( void ) +{ + rtems_unsigned8 data; + + if ( BSP_Configuration.ticks_per_timeslice ) { + + Z8x36_READ ( TIMER, MASTER_INTR, data ); + Z8x36_WRITE( TIMER, MASTER_INTR, (data & 0x01) ); + /* do not restore old vector */ + + } +} + +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(CLOCK_VECTOR); + } + else if (args->command == rtems_build_name('N', 'E', 'W', ' ')) + { + rtems_interrupt_disable( isrlevel ); + (void) set_vector( args->buffer, CLOCK_VECTOR, 1 ); + rtems_interrupt_enable( isrlevel ); + } + +done: + return RTEMS_SUCCESSFUL; +} + |