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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [lib/] [libbsp/] [m68k/] [efi68k/] [clock/] [ckinit.c] - Rev 594
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/* Clock_init() * * This routine initializes the DP8570A periodic interrupt on the * efi68k board. 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 12:00:02 chris Exp $ */ #include <stdlib.h> #include <bsp.h> #include <rtems/libio.h> #define CLOCK_VECTOR (TCP_ISR_LEVEL+24) 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; void per_interrupt(void) { Clock_driver_ticks += 1; *MSR = PER; if ( Clock_isrs == 1 ) { rtems_clock_tick(); Clock_isrs = BSP_Configuration.microseconds_per_tick / 1000; } else Clock_isrs -= 1; } rtems_isr Clock_isr( rtems_vector_number vector ) { unsigned char entry_msr, msr; entry_msr = *MSR; *MSR = 0; while ( (msr=*MSR) & INT ) /* test enabled interrupt bits */ if (msr & PER) per_interrupt(); else if (msr & T0) { *MSR = T0; /* reset interrupt */ Timer_interrupts++; /* inc wrap around counter */ } else /* there has been an error if we reach this point */ /* default action: reset all the interrupts */ *MSR = ( PER | AL | T0 | T1 ); *MSR = entry_msr & (RS | PS); } void Install_clock( rtems_isr_entry clock_isr ) { Clock_driver_ticks = 0; Clock_isrs = BSP_Configuration.microseconds_per_tick / 1000; Old_ticker = (rtems_isr_entry) set_vector( clock_isr, CLOCK_VECTOR, 1 ); *MSR = RS; /* enable 1mS interrupts */ *ICR0 |= OME; atexit( Clock_exit ); } void Clock_exit( void ) { /* shutdown periodic interrupt */ *MSR = RS; *ICR0 &= 0xc0; /* 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; }
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