forked from Imagelibrary/rtems
1eed6f8bfc
Pass the parameter of the clock interrupt handler to Clock_driver_support_at_tick() and Clock_driver_timecounter_tick(). This makes it possible to use the interrupt handler argument in clock drivers. Use the interrupt handler provided by Clock_driver_support_install_isr() to avoid local delarations of Clock_isr(). Update #4862.
112 lines
2.8 KiB
C
112 lines
2.8 KiB
C
/*
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* S3C2400 clock specific using the System Timer
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*/
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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 <bsp/irq.h>
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#include <bsp.h>
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#include <s3c24xx.h>
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void Clock_isr(rtems_irq_hdl_param arg);
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static void clock_isr_on(const rtems_irq_connect_data *unused);
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static void clock_isr_off(const rtems_irq_connect_data *unused);
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static int clock_isr_is_on(const rtems_irq_connect_data *irq);
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rtems_irq_connect_data clock_isr_data = {
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.name = BSP_INT_TIMER4,
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.hdl = Clock_isr,
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.handle = NULL,
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.on = clock_isr_on,
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.off = clock_isr_off,
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.isOn = clock_isr_is_on,
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};
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/**
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* When we get the clock interrupt
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* - clear the interrupt bit?
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* - restart the timer?
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*/
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#define Clock_driver_support_at_tick(arg) \
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do { \
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ClearPending(BIT_TIMER4); \
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} while(0)
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/**
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* Installs the clock ISR. You shouldn't need to change this.
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*/
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#define Clock_driver_support_install_isr( _new ) \
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BSP_install_rtems_irq_handler(&clock_isr_data)
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/**
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* Initialize the hardware for the clock
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* - Set the frequency
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* - enable it
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* - clear any pending interrupts
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*
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* Since you may want the clock always running, you can
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* enable interrupts here. If you do so, the clock_isr_on(),
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* clock_isr_off(), and clock_isr_is_on() functions can be
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* NOPs.
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*/
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#define Clock_driver_support_initialize_hardware() \
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do { \
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uint32_t cr; \
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uint32_t freq; \
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/* set MUX for Timer4 to 1/16 */ \
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cr=rTCFG1 & 0xFFF0FFFF; \
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rTCFG1=(cr | (3<<16)); \
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freq = get_PCLK(); \
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/* set TIMER4 counter, input freq=PLCK/16/16Mhz*/ \
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freq = (freq /16)/16; \
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rTCNTB4 = ((freq / 1000) * rtems_configuration_get_microseconds_per_tick()) / 1000; \
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/*unmask TIMER4 irq*/ \
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rINTMSK&=~BIT_TIMER4; \
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/* start TIMER4 with autoreload */ \
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cr=rTCON & 0xFF8FFFFF; \
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rTCON=(cr|(0x6<<20)); \
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rTCON=(cr|(0x5<<20)); \
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} while (0)
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/**
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* Enables clock interrupt.
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*
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* If the interrupt is always on, this can be a NOP.
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*/
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static void clock_isr_on(const rtems_irq_connect_data *unused)
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{
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}
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/**
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* Disables clock interrupts
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*
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* If the interrupt is always on, this can be a NOP.
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*/
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static void clock_isr_off(const rtems_irq_connect_data *unused)
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{
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return;
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}
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/**
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* Tests to see if clock interrupt is enabled, and returns 1 if so.
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* If interrupt is not enabled, returns 0.
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*
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* If the interrupt is always on, this always returns 1.
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*/
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static int clock_isr_is_on(const rtems_irq_connect_data *irq)
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{
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return 1;
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}
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#define CLOCK_DRIVER_USE_DUMMY_TIMECOUNTER
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/* Make sure to include this, and only at the end of the file */
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#include "../../../shared/dev/clock/clockimpl.h"
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