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author | Joel Sherrill <joel.sherrill@OARcorp.com> | 1995-09-20 15:05:19 +0000 |
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committer | Joel Sherrill <joel.sherrill@OARcorp.com> | 1995-09-20 15:05:19 +0000 |
commit | 486c329f2b4f95dbfefdcbefbe6b25adf7895a94 (patch) | |
tree | e98ee376985db23cf7f6f7da3ba5fe5e63327dbb /c/src/lib/libbsp/m68k/efi332/clock | |
parent | Heap changes required some changes in this screen. (diff) | |
download | rtems-486c329f2b4f95dbfefdcbefbe6b25adf7895a94.tar.bz2 |
Actually adding efi bsp's from John Gwynne after forgetting to
commit them.
Diffstat (limited to 'c/src/lib/libbsp/m68k/efi332/clock')
-rw-r--r-- | c/src/lib/libbsp/m68k/efi332/clock/ckinit.c | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/c/src/lib/libbsp/m68k/efi332/clock/ckinit.c b/c/src/lib/libbsp/m68k/efi332/clock/ckinit.c new file mode 100644 index 0000000000..2bfa34d32d --- /dev/null +++ b/c/src/lib/libbsp/m68k/efi332/clock/ckinit.c @@ -0,0 +1,145 @@ +/* Clock_init() + * + * This routine initailizes the periodic interrupt timer on + * the Motorola 68332. + * + * 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. + * + * $Id$ + */ + +#include <stdlib.h> +#include <bsp.h> +#include <rtems/libio.h> +#include <efi332.h> + +#define CLOCK_VECTOR EFI_PIV + +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; + +rtems_isr Clock_isr(rtems_vector_number vector) +{ + Clock_driver_ticks += 1; + + 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, CLOCK_VECTOR, 1 ); + + /* enable 1mS interrupts */ + *PITR = (unsigned short int)( SAM(0x09,0,PITM) );/* load counter */ + *PICR = (unsigned short int) /* enable interrupt */ + ( SAM(ISRL_PIT,8,PIRQL) | SAM(CLOCK_VECTOR,0,PIV) ); + + atexit( Clock_exit ); + } +} + +void ReInstall_clock( + rtems_isr_entry clock_isr +) +{ + rtems_unsigned32 isrlevel = 0 ; + + rtems_interrupt_disable( isrlevel ); + (void) set_vector( clock_isr, CLOCK_VECTOR, 1 ); + rtems_interrupt_enable( isrlevel ); +} + +void Clock_exit( void ) +{ + + if ( BSP_Configuration.ticks_per_timeslice ) { + + /* shutdown the periodic interrupt */ + *PICR = (unsigned short int) + ( SAM(0,8,PIRQL) | SAM(CLOCK_VECTOR,0,PIV) ); + /* ^^ zero disables interrupt */ + + /* 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_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', ' ')) + { + ReInstall_clock(args->buffer); + } + +done: + return RTEMS_SUCCESSFUL; +} + |