From e4ab88fde5ad3dc273fcee66b03c2892a2d80dac Mon Sep 17 00:00:00 2001 From: Joel Sherrill Date: Thu, 2 Dec 1999 14:00:01 +0000 Subject: Merged of mcp750 and mvme2307 BSP by Eric Valette . As part of this effort, the mpc750 libcpu code is now shared with the ppc6xx. --- c/src/lib/libbsp/powerpc/mvme2307/clock/ckinit.c | 237 ----------------------- 1 file changed, 237 deletions(-) delete mode 100644 c/src/lib/libbsp/powerpc/mvme2307/clock/ckinit.c (limited to 'c/src/lib/libbsp/powerpc/mvme2307/clock/ckinit.c') diff --git a/c/src/lib/libbsp/powerpc/mvme2307/clock/ckinit.c b/c/src/lib/libbsp/powerpc/mvme2307/clock/ckinit.c deleted file mode 100644 index 6adcb73e16..0000000000 --- a/c/src/lib/libbsp/powerpc/mvme2307/clock/ckinit.c +++ /dev/null @@ -1,237 +0,0 @@ -/* ckinit.c - * - * This file provides a template for the clock device driver initialization. - * - * 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. - * - * $Id$ - */ - -#include - -#include -#include -#include - -void Clock_exit( void ); -rtems_isr Clock_isr( rtems_vector_number vector ); - - -/* - * The interrupt vector number associated with the clock tick device - * driver. - */ - -#define CLOCK_VECTOR PPC_IRQ_DECREMENTER - -/* - * 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; - -/* - * Clocks_per_tick is the number of clocks of the decrementer needed - * to fill BSP_Configuration.microseconds_per_tick. - * - * The clock rate is 1/4 the bus clock, or 16.666667 MHz, so: - * - * Clocks_per_tick = ((50/3)*1E6 clocks/sec) * (1 sec/1E6 us) * (X us/tick) - * = X * 50 / 3 clocks/tick - * where X = BSP_Configuration.microseconds_per_tick - */ - -rtems_signed32 Clocks_per_tick; - -/* - * These are set by clock driver during its init - */ - -rtems_device_major_number rtems_clock_major = ~0; -rtems_device_minor_number rtems_clock_minor; - -/* - * The previous ISR on this clock tick interrupt vector. - */ - -rtems_isr_entry Old_ticker; - -void Clock_exit( void ); - -/* - * Inline assembly routines to access the decrementer register - */ -static inline rtems_signed32 read_decrementer(void) { - rtems_signed32 result; - asm volatile ("mfdec %0" : "=r" (result) :); - return result; -} - -static inline void write_decrementer(rtems_signed32 value) { - asm volatile ("mtdec %0" : : "r" (value)); -} - - -/* - * Isr Handler - */ - -rtems_isr Clock_isr( - rtems_vector_number vector -) -{ - rtems_signed32 count, repeat = 0; - const rtems_signed32 period = Clocks_per_tick; - - /* - * bump the number of clock driver ticks since initialization - */ - Clock_driver_ticks++; - - /* - * be very paranoid and count number of "ticks" in case we missed some - * - * update the decrementer and signal rtems the appropriate number of times - */ - count = read_decrementer(); - while (count < 0) { - count += period; - repeat++; - } - write_decrementer(count); - - while (repeat-- > 0) { - rtems_clock_tick(); - } -} - -/* - * Install_clock - * - * Install a clock tick handler and reprograms the chip. This - * is used to initially establish the clock tick. - */ - -void Install_clock( - rtems_isr_entry clock_isr -) -{ - /* - * Initialize the clock tick device driver variables - */ - - Clock_driver_ticks = 0; - switch (Falcon_SYSCR.SystemClock) { - case SYSCLK_50_MHZ: - Clocks_per_tick = - (BSP_Configuration.microseconds_per_tick * 25 + 1) / 2; - break; - case SYSCLK_60_MHZ: - Clocks_per_tick = BSP_Configuration.microseconds_per_tick * 15; - break; - case SYSCLK_67_MHZ: - Clocks_per_tick = - (BSP_Configuration.microseconds_per_tick * 50 + 1) / 3; - break; - } - - /* - * If ticks_per_timeslice is configured as non-zero, then the user - * wants a clock tick. - */ - - if ( BSP_Configuration.ticks_per_timeslice ) { - Old_ticker = (rtems_isr_entry) set_vector( clock_isr, CLOCK_VECTOR, 1 ); - - /* - * Hardware specific initialize goes here - */ - write_decrementer(Clocks_per_tick); - } - - /* - * Schedule the clock cleanup routine to execute if the application exits. - */ - - atexit( Clock_exit ); -} - -/* - * Clean up before the application exits - */ - -void Clock_exit( void ) -{ - if ( BSP_Configuration.ticks_per_timeslice ) { - - /* XXX: turn off the timer interrupts */ - - /* we can't really disable the timer without disabling all external - interupts. we'll slow down the decrementer to it's minimum speed. */ - write_decrementer(~0); - - /* XXX: If necessary, restore the old vector */ - } -} - -/* - * Clock_initialize - * - * Device driver entry point for clock tick driver initialization. - */ - -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; -} -- cgit v1.2.3