diff options
author | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2018-04-19 06:35:52 +0200 |
---|---|---|
committer | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2018-04-20 09:57:01 +0200 |
commit | 7632906fc290b652416ab59eb5fb49356c064ed6 (patch) | |
tree | ac036b1f95637e044e10138ceea8d2b56d80ec97 /bsps/no_cpu | |
parent | bsps: Move bspsmpgetcurrentprocessor.c to bsps (diff) | |
download | rtems-7632906fc290b652416ab59eb5fb49356c064ed6.tar.bz2 |
bsps: Move clock drivers to bsps
This patch is a part of the BSP source reorganization.
Update #3285.
Diffstat (limited to 'bsps/no_cpu')
-rw-r--r-- | bsps/no_cpu/no_bsp/clock/ckinit.c | 127 |
1 files changed, 127 insertions, 0 deletions
diff --git a/bsps/no_cpu/no_bsp/clock/ckinit.c b/bsps/no_cpu/no_bsp/clock/ckinit.c new file mode 100644 index 0000000000..eb0867a895 --- /dev/null +++ b/bsps/no_cpu/no_bsp/clock/ckinit.c @@ -0,0 +1,127 @@ +/* + * This file provides a template for the clock device driver initialization. + * + * If possible, please use the dev/clock/clockimpl.h method for instantiating + * a clock driver. + */ + +/* + * COPYRIGHT (c) 1989-2014. + * On-Line Applications Research Corporation (OAR). + * + * 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. + */ + +#include <stdlib.h> + +#include <rtems.h> +#include <bsp.h> + +void Clock_exit( void ); +rtems_isr Clock_isr( rtems_vector_number vector ); + +/* + * The interrupt vector number associated with the clock tick device + * driver. + */ +#define CLOCK_VECTOR 4 + +/* + * Clock_driver_ticks is a monotonically increasing counter of the + * number of clock ticks since the driver was initialized. + */ +volatile uint32_t Clock_driver_ticks; + +/* + * Clock_isrs is the number of clock ISRs until the next invocation of + * the RTEMS clock tick routine. The clock tick device driver + * gets an interrupt once a millisecond and counts down until the + * length of time between the user configured microseconds per tick + * has passed. + */ +uint32_t Clock_isrs; /* ISRs until next tick */ + +/* + * The previous ISR on this clock tick interrupt vector. + */ +rtems_isr_entry Old_ticker; + +void Clock_exit( void ); + +/* + * Isr Handler + */ +static rtems_isr Clock_isr( + rtems_vector_number vector +) +{ + /* + * bump the number of clock driver ticks since initialization + * + * determine if it is time to announce the passing of tick as configured + * to RTEMS through the rtems_clock_tick directive + * + * perform any timer dependent tasks + */ +} + +/* + * Install_clock + * + * Install a clock tick handler and reprograms the chip. This + * is used to initially establish the clock tick. + */ +void Install_clock( + rtems_isr_entry clock_isr +) +{ + /* + * Initialize the clock tick device driver variables + */ + + Clock_driver_ticks = 0; + Clock_isrs = rtems_configuration_get_microseconds_per_tick() / 1000; + + Old_ticker = (rtems_isr_entry) set_vector( clock_isr, CLOCK_VECTOR, 1 ); + /* + * Hardware specific initialize goes here + */ + + /* XXX */ + + /* + * Schedule the clock cleanup routine to execute if the application exits. + */ + + atexit( Clock_exit ); +} + +/* + * Clean up before the application exits + */ + +void Clock_exit( void ) +{ + /* XXX: turn off the timer interrupts */ + + /* XXX: If necessary, restore the old vector */ +} + +/* + * Clock_initialize + * + * Device driver entry point for clock tick driver initialization. + */ +rtems_device_driver Clock_initialize( + rtems_device_major_number major, + rtems_device_minor_number minor, + void *pargp +) +{ + Install_clock( Clock_isr ); + + return RTEMS_SUCCESSFUL; +} + |