From 0c04c377bc8ac177d28bd0e0096d7c6940d33cd4 Mon Sep 17 00:00:00 2001 From: Joel Sherrill Date: Thu, 18 Feb 1999 16:48:14 +0000 Subject: ./clock/Makefile.in,v ./clock/clock.c,v ./console/Makefile.in,v ./console/config.c,v ./console/console.c,v ./console/console.h,v ./console/debugio.c,v ./console/i8042.c,v ./console/i8042_p.h,v ./console/i8042vga.c,v ./console/i8042vga.h,v ./console/ns16550.c,v ./console/ns16550.h,v ./console/ns16550_p.h,v ./console/ns16550cfg.c,v ./console/ns16550cfg.h,v ./console/vga.c,v ./console/vga_p.h,v ./console/z85c30.c,v ./console/z85c30.h,v ./console/z85c30_p.h,v ./console/z85c30cfg.c,v ./console/z85c30cfg.h,v ./include/Makefile.in,v ./include/bsp.h,v ./include/chain.h,v ./include/coverhd.h,v ./include/extisrdrv.h,v ./include/nvram.h,v ./include/pci.h,v ./include/tod.h,v ./network/Makefile.in,v ./network/amd79c970.c,v ./network/amd79c970.h,v ./nvram/Makefile.in,v ./nvram/ds1385.h,v ./nvram/mk48t18.h,v ./nvram/nvram.c,v ./nvram/prepnvr.h,v ./nvram/stk11c68.h,v ./pci/Makefile.in,v ./pci/pci.c,v ./start/Makefile.in,v ./start/start.s,v ./startup/Makefile.in,v ./startup/bspclean.c,v ./startup/bspstart.c,v ./startup/bsptrap.s,v ./startup/device-tree,v ./startup/genpvec.c,v ./startup/linkcmds,v ./startup/rtems-ctor.cc,v ./startup/sbrk.c,v ./startup/setvec.c,v ./startup/spurious.c,v ./startup/swap.c,v ./timer/Makefile.in,v ./timer/timer.c,v ./tod/Makefile.in,v ./tod/cmos.h,v ./tod/tod.c,v ./universe/Makefile.in,v ./universe/universe.c,v ./vectors/Makefile.in,v ./vectors/README,v ./vectors/align_h.s,v ./vectors/vectors.s,v ./wrapup/Makefile.in,v ./Makefile.in,v ./README,v ./STATUS,v ./bsp_specs,v --- c/src/lib/libbsp/powerpc/ppcn_60x/clock/clock.c | 241 ++++++++++++++++++++++++ 1 file changed, 241 insertions(+) create mode 100644 c/src/lib/libbsp/powerpc/ppcn_60x/clock/clock.c (limited to 'c/src/lib/libbsp/powerpc/ppcn_60x/clock/clock.c') diff --git a/c/src/lib/libbsp/powerpc/ppcn_60x/clock/clock.c b/c/src/lib/libbsp/powerpc/ppcn_60x/clock/clock.c new file mode 100644 index 0000000000..29ca97be32 --- /dev/null +++ b/c/src/lib/libbsp/powerpc/ppcn_60x/clock/clock.c @@ -0,0 +1,241 @@ +/* + * Clock Tick Device Driver + * + * This routine utilizes the Decrementer Register common to the PPC family. + * + * The tick frequency is directly programmed to the configured number of + * microseconds per tick. + * + * 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 + +#include +#include +#include + +/* + * The Real Time Clock Counter Timer uses this trap type. + */ + +#define CLOCK_VECTOR PPC_IRQ_DECREMENTER + +/* + * Clock ticks since initialization + */ + +volatile rtems_unsigned32 Clock_driver_ticks; + +/* + * This is the value programmed into the count down timer. + */ + +rtems_unsigned32 Clock_Decrementer_value; + +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; + +#define PPC_Set_decrementer( _clicks ) \ + do { \ + asm volatile( "mtdec %0" : "=r" ((_clicks)) : "r" ((_clicks)) ); \ + } while (0) + + +/* + * Clock_isr + * + * This is the clock tick interrupt handler. + * + * Input parameters: + * vector - vector number + * + * Output parameters: NONE + * + * Return values: NONE + * + */ +rtems_isr Clock_isr( + rtems_vector_number vector, + CPU_Interrupt_frame *frame +) +{ + /* + * Set the decrementer. + */ + + PPC_Set_decrementer( Clock_Decrementer_value ); + + /* + * The driver has seen another tick. + */ + + Clock_driver_ticks += 1; + + /* + * Real Time Clock counter/timer is set to automatically reload. + */ + + rtems_clock_tick(); +} + +/* + * Install_clock + * + * This routine actually performs the hardware initialization for the clock. + * + * Input parameters: + * clock_isr - clock interrupt service routine entry point + * + * Output parameters: NONE + * + * Return values: NONE + * + */ + +extern int CLOCK_SPEED; + +void Install_clock( + rtems_isr_entry clock_isr +) +{ + Clock_driver_ticks = 0; + + if ( BSP_Configuration.ticks_per_timeslice ) { + Old_ticker = (rtems_isr_entry) set_vector( clock_isr, CLOCK_VECTOR, 1 ); + + PPC_Set_decrementer( Clock_Decrementer_value ); + + atexit( Clock_exit ); + } +} + +/* + * Clock_exit + * + * This routine allows the clock driver to exit by masking the interrupt and + * disabling the clock's counter. + * + * Input parameters: NONE + * + * Output parameters: NONE + * + * Return values: NONE + * + */ + +void Clock_exit( void ) +{ + if ( BSP_Configuration.ticks_per_timeslice ) { + + /* nothing to do */; + + /* do not restore old vector */ + } +} + +/* + * Clock_initialize + * + * This routine initializes the clock driver. + * + * Input parameters: + * major - clock device major number + * minor - clock device minor number + * parg - pointer to optional device driver arguments + * + * Output parameters: NONE + * + * Return values: + * rtems_device_driver status code + */ + +rtems_device_driver Clock_initialize( + rtems_device_major_number major, + rtems_device_minor_number minor, + void *pargp +) +{ + Clock_Decrementer_value = (ulCpuBusClock/4000)* + (BSP_Configuration.microseconds_per_tick/1000); + + Install_clock((rtems_isr_entry)Clock_isr); + + /* + * make major/minor avail to others such as shared memory driver + */ + + rtems_clock_major = major; + rtems_clock_minor = minor; + + return RTEMS_SUCCESSFUL; +} + +/* + * Clock_control + * + * This routine is the clock device driver control entry point. + * + * Input parameters: + * major - clock device major number + * minor - clock device minor number + * parg - pointer to optional device driver arguments + * + * Output parameters: NONE + * + * Return values: + * rtems_device_driver status code + */ + +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, pargp ); + } + 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; +} + + + + + -- cgit v1.2.3