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Diffstat (limited to 'c/src/lib/libcpu/powerpc/ppc403/clock/clock.c')
-rw-r--r--c/src/lib/libcpu/powerpc/ppc403/clock/clock.c265
1 files changed, 0 insertions, 265 deletions
diff --git a/c/src/lib/libcpu/powerpc/ppc403/clock/clock.c b/c/src/lib/libcpu/powerpc/ppc403/clock/clock.c
deleted file mode 100644
index 068cf4f538..0000000000
--- a/c/src/lib/libcpu/powerpc/ppc403/clock/clock.c
+++ /dev/null
@@ -1,265 +0,0 @@
-/* clock.c
- *
- * This routine initializes the interval timer on the
- * PowerPC 403 CPU. The tick frequency is specified by the bsp.
- *
- * Author: Andrew Bray <andy@i-cubed.co.uk>
- *
- * COPYRIGHT (c) 1995 by i-cubed ltd.
- *
- * To anyone who acknowledges that this file is provided "AS IS"
- * without any express or implied warranty:
- * permission to use, copy, modify, and distribute this file
- * for any purpose is hereby granted without fee, provided that
- * the above copyright notice and this notice appears in all
- * copies, and that the name of i-cubed limited not be used in
- * advertising or publicity pertaining to distribution of the
- * software without specific, written prior permission.
- * i-cubed limited makes no representations about the suitability
- * of this software for any purpose.
- *
- * Derived from c/src/lib/libcpu/hppa1_1/clock/clock.c:
- *
- * 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 <bsp.h>
-#include <clockdrv.h>
-#include <rtems/libio.h>
-
-#include <stdlib.h> /* for atexit() */
-
-extern rtems_cpu_table Cpu_table; /* owned by BSP */
-
-volatile rtems_unsigned32 Clock_driver_ticks;
-static rtems_unsigned32 pit_value, tick_time;
-static rtems_boolean auto_restart;
-
-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;
-
-static INLINE rtems_unsigned32 get_itimer(void)
-{
- register rtems_unsigned32 rc;
-
- asm volatile ("mfspr %0, 0x3dd" : "=r" ((rc))); /* TBLO */
-
- return rc;
-}
-
-/*
- * ISR Handler
- */
-
-rtems_isr
-Clock_isr(rtems_vector_number vector)
-{
- if (!auto_restart)
- {
- rtems_unsigned32 clicks_til_next_interrupt;
- rtems_unsigned32 itimer_value;
-
- /*
- * setup for next interrupt; making sure the new value is reasonably
- * in the future.... in case we lost out on an interrupt somehow
- */
-
- itimer_value = get_itimer();
- tick_time += pit_value;
-
- /*
- * how far away is next interrupt *really*
- * It may be a long time; this subtraction works even if
- * Clock_clicks_interrupt < Clock_clicks_low_order via
- * the miracle of unsigned math.
- */
- clicks_til_next_interrupt = tick_time - itimer_value;
-
- /*
- * If it is too soon then bump it up.
- * This should only happen if CPU_HPPA_CLICKS_PER_TICK is too small.
- * But setting it low is useful for debug, so...
- */
-
- if (clicks_til_next_interrupt < 400)
- {
- tick_time = itimer_value + 1000;
- clicks_til_next_interrupt = 1000;
- /* XXX: count these! this should be rare */
- }
-
- /*
- * If it is too late, that means we missed the interrupt somehow.
- * Rather than wait 35-50s for a wrap, we just fudge it here.
- */
-
- if (clicks_til_next_interrupt > pit_value)
- {
- tick_time = itimer_value + 1000;
- clicks_til_next_interrupt = 1000;
- /* XXX: count these! this should never happen :-) */
- }
-
- asm volatile ("mtspr 0x3db, %0" :: "r"
- (clicks_til_next_interrupt)); /* PIT */
- }
-
- asm volatile ( "mtspr 0x3d8, %0" :: "r" (0x08000000)); /* TSR */
-
- Clock_driver_ticks++;
-
- rtems_clock_tick();
-}
-
-void Install_clock(rtems_isr_entry clock_isr)
-{
- rtems_isr_entry previous_isr;
- rtems_unsigned32 pvr, iocr;
-
- Clock_driver_ticks = 0;
-
- asm volatile ("mfdcr %0, 0xa0" : "=r" (iocr)); /* IOCR */
- iocr &= ~4;
- iocr |= 4; /* Select external timer clock */
- asm volatile ("mtdcr 0xa0, %0" : "=r" (iocr) : "0" (iocr)); /* IOCR */
-
- asm volatile ("mfspr %0, 0x11f" : "=r" ((pvr))); /* PVR */
-
- if (((pvr & 0xffff0000) >> 16) != 0x0020)
- return; /* Not a ppc403 */
-
- if ((pvr & 0xff00) == 0x0000) /* 403GA */
- auto_restart = (pvr & 0x00f0) > 0x0000 ? 1 : 0;
- else if ((pvr & 0xff00) == 0x0100) /* 403GB */
- auto_restart = 1;
-
- pit_value = BSP_Configuration.microseconds_per_tick *
- Cpu_table.clicks_per_usec;
-
- if (BSP_Configuration.ticks_per_timeslice)
- {
- register rtems_unsigned32 tcr;
-
- /*
- * initialize the interval here
- * First tick is set to right amount of time in the future
- * Future ticks will be incremented over last value set
- * in order to provide consistent clicks in the face of
- * interrupt overhead
- */
-
- rtems_interrupt_catch(clock_isr, PPC_IRQ_PIT, &previous_isr);
-
- asm volatile ("mtspr 0x3db, %0" : : "r" (pit_value)); /* PIT */
-
- asm volatile ("mfspr %0, 0x3da" : "=r" ((tcr))); /* TCR */
-
- tcr &= ~ 0x04400000;
-
- tcr |= (auto_restart ? 0x04400000 : 0x04000000);
-
- tick_time = get_itimer() + pit_value;
-
- asm volatile ("mtspr 0x3da, %0" : "=r" ((tcr)) : "0" ((tcr))); /* TCR */
- }
- atexit(Clock_exit);
-}
-
-void
-ReInstall_clock(rtems_isr_entry new_clock_isr)
-{
- rtems_isr_entry previous_isr;
- rtems_unsigned32 isrlevel = 0;
-
- rtems_interrupt_disable(isrlevel);
-
- rtems_interrupt_catch(new_clock_isr, PPC_IRQ_PIT, &previous_isr);
-
- rtems_interrupt_enable(isrlevel);
-}
-
-
-/*
- * Called via atexit()
- * Remove the clock interrupt handler by setting handler to NULL
- */
-
-void
-Clock_exit(void)
-{
- if ( BSP_Configuration.ticks_per_timeslice )
- {
- register rtems_unsigned32 tcr;
-
- asm volatile ("mfspr %0, 0x3da" : "=r" ((tcr))); /* TCR */
-
- tcr &= ~ 0x04400000;
-
- asm volatile ("mtspr 0x3da, %0" : "=r" ((tcr)) : "0" ((tcr))); /* TCR */
-
- (void) set_vector(0, PPC_IRQ_PIT, 1);
- }
-
-}
-
-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(PPC_IRQ_PIT);
- }
- else if (args->command == rtems_build_name('N', 'E', 'W', ' '))
- {
- ReInstall_clock(args->buffer);
- }
-
-done:
- return RTEMS_SUCCESSFUL;
-}
-
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