forked from Imagelibrary/rtems
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/* clock.c
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*
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* This routine initializes the PIT on the MPC8xx.
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* The tick frequency is specified by the bsp.
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*/
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/*
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* Author: Jay Monkman (jmonkman@frasca.com)
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* Copyright (C) 1998 by Frasca International, Inc.
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*
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* Derived from c/src/lib/libcpu/ppc/ppc403/clock/clock.c:
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*
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* Author: Andrew Bray <andy@i-cubed.co.uk>
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*
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* COPYRIGHT (c) 1995 by i-cubed ltd.
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*
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* To anyone who acknowledges that this file is provided "AS IS"
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* without any express or implied warranty:
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* permission to use, copy, modify, and distribute this file
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* for any purpose is hereby granted without fee, provided that
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* the above copyright notice and this notice appears in all
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* copies, and that the name of i-cubed limited not be used in
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* advertising or publicity pertaining to distribution of the
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* software without specific, written prior permission.
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* i-cubed limited makes no representations about the suitability
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* of this software for any purpose.
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*
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* Derived from c/src/lib/libcpu/hppa1_1/clock/clock.c:
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*
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* COPYRIGHT (c) 1989-2007.
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* On-Line Applications Research Corporation (OAR).
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rtems.org/license/LICENSE.
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*/
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#include <rtems.h>
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#include <rtems/clockdrv.h>
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#include <rtems/libio.h>
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#include <rtems/powerpc/powerpc.h>
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#include <stdlib.h> /* for atexit() */
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#include <mpc8xx.h>
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#include <bsp.h>
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volatile uint32_t Clock_driver_ticks;
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extern volatile m8xx_t m8xx;
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extern int BSP_get_clock_irq_level(void);
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extern uint32_t bsp_clicks_per_usec;
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/*
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* Prototypes
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*/
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rtems_isr Clock_isr(rtems_vector_number vector);
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void Clock_exit( void );
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void clockOn(void* unused);
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void clockOff(void* unused);
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int clockIsOn(void* unused);
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void Install_clock(rtems_isr_entry clock_isr);
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void ReInstall_clock(rtems_isr_entry new_clock_isr);
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/*
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* ISR Handler
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*/
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rtems_isr Clock_isr(rtems_vector_number vector)
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{
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m8xx.piscr |= M8xx_PISCR_PS;
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Clock_driver_ticks++;
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rtems_clock_tick();
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}
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void clockOn(void* unused)
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{
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unsigned desiredLevel;
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uint32_t pit_value;
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uint32_t extclk;
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bool force_prescaler = false;
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uint32_t immr_val;
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if (bsp_clicks_per_usec == 0) {
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/*
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* oscclk is too low for PIT, compute extclk and derive PIT from there
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*/
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/*
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* determine external input clock by examining the PLL settings
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* this must be done differently depending on type of PLL
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*/
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_mfspr(immr_val,M8xx_IMMR);
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if (8 == ((immr_val & 0x0000FF00) >> 8)) {
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/*
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* for MPC866: complex PLL
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*/
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uint32_t plprcr_val;
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uint32_t mfn_value;
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uint32_t mfd_value;
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uint32_t mfi_value;
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uint32_t pdf_value;
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uint32_t s_value;
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plprcr_val = m8xx.plprcr;
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mfn_value = (plprcr_val & (0xf8000000)) >> (31- 4);
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mfd_value = (plprcr_val & (0x07c00000)) >> (31- 9);
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s_value = (plprcr_val & (0x00300000)) >> (31-11);
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mfi_value = (plprcr_val & (0x000f0000)) >> (31-15);
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pdf_value = (plprcr_val & (0x00000006)) >> (31-30);
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extclk = (((uint64_t)bsp_clock_speed)
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* ((pdf_value + 1) * (mfd_value + 1))
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/ (mfi_value * (mfd_value + 1) + mfn_value)
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* (1 << s_value));
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}
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else {
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/*
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* for MPC860/850 etc: simple PLL
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*/
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uint32_t mf_value;
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mf_value = m8xx.plprcr >> 20;
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extclk = bsp_clock_speed / (mf_value+1);
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}
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pit_value = (extclk
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/ 1000
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/ 4
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* rtems_configuration_get_microseconds_per_tick()
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/ 1000);
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m8xx.sccr |= (1<<23);
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force_prescaler = true;
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}
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else {
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pit_value = (rtems_configuration_get_microseconds_per_tick() *
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bsp_clicks_per_usec);
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m8xx.sccr &= ~(1<<23);
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}
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if ((pit_value > 0xffff) || force_prescaler) {
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/*
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* try to activate prescaler
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* NOTE: divider generates odd values now...
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*/
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pit_value = pit_value / 128;
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m8xx.sccr |= (1<<24);
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}
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else {
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m8xx.sccr &= ~(1<<24);
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}
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if (pit_value > 0xffff) { /* pit is only 16 bits long */
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rtems_fatal_error_occurred(-1);
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}
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m8xx.pitc = pit_value - 1;
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desiredLevel = BSP_get_clock_irq_level();
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/* set PIT irq level, enable PIT, PIT interrupts */
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/* and clear int. status */
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m8xx.piscr = M8xx_PISCR_PIRQ(desiredLevel) |
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M8xx_PISCR_PTE | M8xx_PISCR_PS | M8xx_PISCR_PIE;
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}
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/*
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* Called via atexit()
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* Remove the clock interrupt handler by setting handler to NULL
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*/
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void clockOff(void* unused)
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{
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/* disable PIT and PIT interrupts */
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m8xx.piscr &= ~(M8xx_PISCR_PTE | M8xx_PISCR_PIE);
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}
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int clockIsOn(void* unused)
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{
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if (m8xx.piscr & M8xx_PISCR_PIE)
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return 1;
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return 0;
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}
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/*
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* Called via atexit()
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* Remove the clock interrupt handler by setting handler to NULL
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*/
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void Clock_exit(void)
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{
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(void) BSP_disconnect_clock_handler ();
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}
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void Install_clock(rtems_isr_entry clock_isr)
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{
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Clock_driver_ticks = 0;
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BSP_connect_clock_handler (clock_isr);
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atexit(Clock_exit);
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}
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void ReInstall_clock(rtems_isr_entry new_clock_isr)
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{
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BSP_connect_clock_handler (new_clock_isr);
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}
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rtems_device_driver Clock_initialize(
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rtems_device_major_number major,
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rtems_device_minor_number minor,
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void *pargp
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)
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{
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Install_clock( Clock_isr );
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return RTEMS_SUCCESSFUL;
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}
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File diff suppressed because it is too large
Load Diff
@@ -56,7 +56,6 @@ endif
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librtemsbsp_a_SOURCES += ../../../../../../bsps/powerpc/shared/cache/cache.c
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librtemsbsp_a_SOURCES += ../../../../../../bsps/powerpc/shared/cache/cache.c
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librtemsbsp_a_SOURCES += ../../../../../../bsps/powerpc/shared/btimer/btimer-ppc-dec.c
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librtemsbsp_a_SOURCES += ../../../../../../bsps/powerpc/shared/btimer/btimer-ppc-dec.c
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librtemsbsp_a_SOURCES += ../../../../../../bsps/powerpc/tqm8xx/dev/console-generic.c
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librtemsbsp_a_SOURCES += ../../../../../../bsps/powerpc/tqm8xx/start/cp.c
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librtemsbsp_a_SOURCES += ../../../../../../bsps/powerpc/tqm8xx/start/cp.c
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librtemsbsp_a_SOURCES += ../../../../../../bsps/powerpc/tqm8xx/start/dpram.c
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librtemsbsp_a_SOURCES += ../../../../../../bsps/powerpc/tqm8xx/start/dpram.c
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librtemsbsp_a_SOURCES += ../../../../../../bsps/powerpc/tqm8xx/start/mmu.c
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librtemsbsp_a_SOURCES += ../../../../../../bsps/powerpc/tqm8xx/start/mmu.c
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Reference in New Issue
Block a user