source: rtems/bsps/arm/gumstix/clock/clock.c @ 350b07a

Last change on this file since 350b07a was 7ee59313, checked in by Sebastian Huber <sebastian.huber@…>, on Jun 1, 2018 at 5:11:12 AM

Remove Clock_driver_support_shutdown_hardware()

The aim of this clock driver hook was to stop clock tick interrupts at
some late point in the exit() procedure.

The use of atexit() pulls in malloc() which pulls in errno. It is
incompatible with the intention of the
CONFIGURE_DISABLE_NEWLIB_REENTRANCY configuration option.

The exit() function must be called from thread context, so accompanied
clock tick interrupts should cause no harm. On the contrary, someone
may assume a normal operating system operation, e.g. working timeouts.

Remove the Clock_driver_support_shutdown_hardware() clock driver hook.

Close #3436.

  • Property mode set to 100644
File size: 2.5 KB
Line 
1/*
2 *  PXA255 clock specific using the System Timer
3 *
4 *  RTEMS uses IRQ 26 as Clock Source
5 */
6
7/*
8 *  By Yang Xi <hiyangxi@gmail.com>
9 *
10 *  The license and distribution terms for this file may be
11 *  found in the file LICENSE in this distribution or at
12 *  http://www.rtems.org/license/LICENSE.
13 */
14
15#include <rtems.h>
16#include <rtems/clockdrv.h>
17#include <rtems/libio.h>
18
19#include <stdlib.h>
20#include <bsp.h>
21#include <bspopts.h>
22#include <bsp/irq.h>
23#include <pxa255.h>
24
25#if ON_SKYEYE==1
26  #define CLOCK_DRIVER_USE_FAST_IDLE 1
27#endif
28
29static unsigned long period_num;
30
31/**
32 * Enables clock interrupt.
33 *
34 * If the interrupt is always on, this can be a NOP.
35 */
36static void clock_isr_on(const rtems_irq_connect_data *unused)
37{
38  /*Clear the interrupt bit */
39  XSCALE_OS_TIMER_TSR = 0x1;
40
41  /* enable timer interrupt */
42  XSCALE_OS_TIMER_IER |= 0x1;
43
44#if ON_SKYEYE==1
45  period_num = (TIMER_RATE* rtems_configuration_get_microseconds_per_tick())/100000;
46#else
47  period_num = (TIMER_RATE* rtems_configuration_get_microseconds_per_tick())/10000;
48#endif
49
50  XSCALE_OS_TIMER_MR0 = XSCALE_OS_TIMER_TCR + period_num;
51}
52
53/**
54 * Disables clock interrupts
55 *
56 * If the interrupt is always on, this can be a NOP.
57 */
58static void clock_isr_off(const rtems_irq_connect_data *unused)
59{
60  /*Clear the interrupt bit */
61  XSCALE_OS_TIMER_TSR = 0x1;
62  /* disable timer interrupt*/
63  XSCALE_OS_TIMER_IER &= ~0x1;
64}
65
66/**
67 * Tests to see if clock interrupt is enabled, and returns 1 if so.
68 * If interrupt is not enabled, returns 0.
69 *
70 * If the interrupt is always on, this always returns 1.
71 */
72static int clock_isr_is_on(const rtems_irq_connect_data *irq)
73{
74  /* check timer interrupt */
75  return XSCALE_OS_TIMER_IER & 0x1;
76}
77
78void Clock_isr(rtems_irq_hdl_param arg);
79
80rtems_irq_connect_data clock_isr_data = {
81  .name   = XSCALE_IRQ_OS_TIMER,
82  .hdl    = Clock_isr,
83  .handle = NULL,
84  .on     = clock_isr_on,
85  .off    = clock_isr_off,
86  .isOn   = clock_isr_is_on,
87};
88
89#define Clock_driver_support_install_isr( _new ) \
90  BSP_install_rtems_irq_handler(&clock_isr_data)
91
92static void Clock_driver_support_initialize_hardware(void)
93{
94  period_num = TIMER_RATE* rtems_configuration_get_microseconds_per_tick();
95#if ON_SKYEYE==1
96  period_num /= 100000;
97#else
98  period_num /= 10000;
99#endif
100}
101
102#define Clock_driver_support_at_tick() \
103  do { \
104    /* read the status to clear the int */ \
105    XSCALE_OS_TIMER_TSR = 0x1; \
106    \
107    /*Add the match register*/ \
108    XSCALE_OS_TIMER_MR0 = XSCALE_OS_TIMER_TCR + period_num; \
109  } while (0)
110
111#define CLOCK_DRIVER_USE_DUMMY_TIMECOUNTER
112
113#include "../../../shared/dev/clock/clockimpl.h"
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