URL
https://opencores.org/ocsvn/openrisc/openrisc/trunk
Subversion Repositories openrisc
[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [lib/] [libbsp/] [m68k/] [gen68302/] [clock/] [ckinit.c] - Rev 214
Go to most recent revision | Compare with Previous | Blame | View Log
/* Clock_init() * * This routine initializes Timer 1 for an MC68302. * The tick frequency is 1 millisecond. * * Input parameters: NONE * * Output parameters: NONE * * COPYRIGHT (c) 1989-1999. * On-Line Applications Research Corporation (OAR). * * The license and distribution terms for this file may be * found in the file LICENSE in this distribution or at * http://www.OARcorp.com/rtems/license.html. * * $Id: ckinit.c,v 1.2 2001-09-27 12:00:04 chris Exp $ */ #include <stdlib.h> /* for atexit() */ #include <bsp.h> #include <rtems/libio.h> #include "m68302.h" #define CLOCK_VECTOR 137 #define TMR1_VAL ( RBIT_TMR_RST /* software reset the timer */\ | RBIT_TMR_ICLK_MASTER16 /* master clock divided by 16 */\ | RBIT_TMR_FRR /* restart timer after ref reached */\ | RBIT_TMR_ORI) /* enable interrupt when ref reached */ #define TRR1_VAL 1000 /* 1000 ticks @ 16MHz/16 * = 1 millisecond tick. */ /* * Clock_driver_ticks is a monotonically increasing counter of the * number of clock ticks since the driver was initialized. */ volatile rtems_unsigned32 Clock_driver_ticks; /* * Clock_isrs is the number of clock ISRs until the next invocation of * the RTEMS clock tick routine. The clock tick device driver * gets an interrupt once a millisecond and counts down until the * length of time between the user configured microseconds per tick * has passed. */ rtems_unsigned32 Clock_isrs; 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; m302.reg.isr = RBIT_ISR_TIMER1; /* clear in-service bit */ m302.reg.ter1 = (RBIT_TER_REF | RBIT_TER_CAP); /* clear timer intr request */ 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; set_vector( clock_isr, CLOCK_VECTOR, 1 ); m302.reg.trr1 = TRR1_VAL; /* set timer reference register */ m302.reg.tmr1 = TMR1_VAL; /* set timer mode register & enable */ /* * Enable TIMER1 interrupts only. */ m302.reg.imr = RBIT_IMR_TIMER1; /* set 68302 int-mask to allow ints */ atexit( Clock_exit ); } void Clock_exit( void ) { /* TODO: figure out what to do here */ /* 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; }
Go to most recent revision | Compare with Previous | Blame | View Log