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/*
* RTEMS generic mcf548x BSP
*
* The file contains the clock driver code of generic MCF548x BSP. |
*
* Parts of the code has been derived from the "dBUG source code"
* package Freescale is providing for M548X EVBs. The usage of
* the modified or unmodified code and it's integration into the
* generic mcf548x BSP has been done according to the Freescale
* license terms.
*
* The Freescale license terms can be reviewed in the file
*
* LICENSE.Freescale
*
* The generic mcf548x BSP has been developed on the basic
* structures and modules of the av5282 BSP.
*/
/*
* Copyright (c) 2008 embedded brains GmbH. All rights reserved.
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
/*
* Use first slice timer (SLT0) as the system clock.
*
*/
#include <rtems.h>
#include <bsp.h>
#include <bsp/irq-generic.h>
#include <mcf548x/mcf548x.h>
/*
* Use SLT 0
*/
#define CLOCK_IRQ MCF548X_IRQ_SLT0
/*
* Periodic interval timer interrupt handler
*/
#define Clock_driver_support_at_tick() \
do { \
MCF548X_SLT_SSR0 = MCF548X_SLT_SSR_ST; \
} while (0) \
/*
* Attach clock interrupt handler
*/
#define Clock_driver_support_install_isr( _new ) \
set_vector(_new, CLOCK_IRQ + 64, 1)
/*
* Set up the clock hardware
*
* We need to have 1 interrupt every 10,000 microseconds
* XLB clock 100 MHz / MCF548X_SLT_SLTCNT0 = XLB clock/100
*/
#define Clock_driver_support_initialize_hardware() \
do { \
bsp_interrupt_vector_enable(CLOCK_IRQ); \
MCF548X_SLT_SLTCNT0 = get_CPU_clock_speed() \
/ 1000 \
* rtems_configuration_get_microseconds_per_tick() \
/ 1000; \
MCF548X_SLT_SCR0 |= (MCF548X_SLT_SCR_TEN | MCF548X_SLT_SCR_RUN | MCF548X_SLT_SCR_IEN); \
} while (0)
#define CLOCK_DRIVER_USE_DUMMY_TIMECOUNTER
#include "../../../shared/dev/clock/clockimpl.h"
|
