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/* RTEMS Clock Tick Driver for Blackfin. Uses Blackfin Core Timer.
*
* Copyright (c) 2008 Kallisti Labs, Los Gatos, CA, USA
* written by Allan Hessenflow <allanh@kallisti.com>
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.com/license/LICENSE.
*
* $Id$
*/
#include <rtems.h>
#include <stdlib.h>
#include <rtems/libio.h>
#include <bsp.h>
#include <libcpu/cecRegs.h>
#include <libcpu/coreTimerRegs.h>
volatile uint32_t Clock_driver_ticks;
void Clock_exit(void);
/*
* Major and minor number.
*/
rtems_device_major_number rtems_clock_major = ~0;
rtems_device_minor_number rtems_clock_minor;
static rtems_isr clockISR(rtems_vector_number vector) {
Clock_driver_ticks += 1;
#ifdef CLOCK_DRIVER_USE_FAST_IDLE
do {
rtems_clock_tick();
} while (_Thread_Executing == _Thread_Idle &&
_Thread_Heir == _Thread_Executing);
#else
rtems_clock_tick();
#endif
}
/*
* Clock_exit
*
* This routine allows the clock driver to exit by masking the interrupt and
* disabling the clock's counter.
*
* Input parameters: NONE
*
* Output parameters: NONE
*
* Return values: NONE
*
*/
void Clock_exit(void) {
*(uint32_t volatile *) TCNTL = 0;
}
/*
* Clock_initialize
*
* This routine initializes the clock driver.
*
* Input parameters:
* major - clock device major number
* minor - clock device minor number
* parg - pointer to optional device driver arguments
*
* Output parameters: NONE
*
* Return values:
* rtems_device_driver status code
*/
rtems_device_driver Clock_initialize(rtems_device_major_number major,
rtems_device_minor_number minor,
void *pargp) {
Clock_driver_ticks = 0;
set_vector(clockISR, CEC_CORE_TIMER_VECTOR, 1);
*(uint32_t volatile *) TCNTL = TCNTL_TMPWR | TCNTL_TAUTORLD;
*(uint32_t volatile *) TSCALE = 0;
*(uint32_t volatile *) TPERIOD = CCLK / 1000000 *
rtems_configuration_get_microseconds_per_tick();
*(uint32_t volatile *) TCNTL = TCNTL_TMPWR | TCNTL_TAUTORLD | TCNTL_TMREN;
atexit(Clock_exit);
/*
* make major/minor avail to others such as shared memory driver
*/
rtems_clock_major = major;
rtems_clock_minor = minor;
return RTEMS_SUCCESSFUL;
}
/*
* Clock_control
*
* This routine is the clock device driver control entry point.
*
* Input parameters:
* major - clock device major number
* minor - clock device minor number
* parg - pointer to optional device driver arguments
*
* Output parameters: NONE
*
* Return values:
* rtems_device_driver status code
*/
rtems_device_driver Clock_control(rtems_device_major_number major,
rtems_device_minor_number minor,
void *pargp) {
rtems_interrupt_level 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', ' ')) {
clockISR(CEC_CORE_TIMER_VECTOR);
} else if (args->command == rtems_build_name('N', 'E', 'W', ' ')) {
rtems_interrupt_disable(isrLevel);
set_vector(args->buffer, CEC_CORE_TIMER_VECTOR, 1);
rtems_interrupt_enable(isrLevel);
}
done:
return RTEMS_SUCCESSFUL;
}
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