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|
/*===============================================================*\
| Project: RTEMS generic mcf548x BSP |
+-----------------------------------------------------------------+
| File: clock.c |
+-----------------------------------------------------------------+
| The file contains the clock driver code of generic MCF548x BSP. |
+-----------------------------------------------------------------+
| Copyright (c) 2007 |
| Embedded Brains GmbH |
| Obere Lagerstr. 30 |
| D-82178 Puchheim |
| Germany |
| rtems@embedded-brains.de |
+-----------------------------------------------------------------+
| |
| 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 |
| |
| Freescale_license.txt |
| |
+-----------------------------------------------------------------+
| |
| The generic mcf548x BSP has been developed on the basic |
| structures and modules of the av5282 BSP. |
| |
+-----------------------------------------------------------------+
| |
| 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. |
| |
+-----------------------------------------------------------------+
| |
| date history ID |
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| 12.11.07 1.0 ras |
| |
\*===============================================================*/
/*
* 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, _old ) \
do { \
_old = (rtems_isr_entry)set_vector(_new, CLOCK_IRQ + 64, 1); \
} while(0)
/*
* Turn off the clock
*/
#define Clock_driver_support_shutdown_hardware() \
do { \
MCF548X_SLT_SCR0 &= ~(MCF548X_SLT_SCR_TEN | MCF548X_SLT_SCR_RUN | MCF548X_SLT_SCR_IEN); \
} while(0)
/*
* 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/clockdrv_shell.h"
|
