source: rtems/c/src/lib/libbsp/m68k/mcf52235/clock/clock.c @ f3b29236

Last change on this file since f3b29236 was f3b29236, checked in by Sebastian Huber <sebastian.huber@…>, on Sep 18, 2017 at 6:22:38 AM

bsps: Clock_driver_support_install_isr()

Remove old ISR parameter since is not used by the clock driver shell.
Make an implementation optional.

Update #3139.

  • Property mode set to 100644
File size: 2.3 KB
Line 
1/*
2 * Use the last periodic interval timer (PIT2) as the system clock.
3 */
4
5#include <rtems.h>
6#include <rtems/timecounter.h>
7#include <bsp.h>
8
9/*
10 * Use INTC0 base
11 */
12#define CLOCK_VECTOR (64+56)
13
14static rtems_timecounter_simple mcf52235_tc;
15
16static uint32_t mcf52235_tc_get(rtems_timecounter_simple *tc)
17{
18  return MCF_PIT1_PCNTR;
19}
20
21static bool mcf52235_tc_is_pending(rtems_timecounter_simple *tc)
22{
23  return (MCF_PIT1_PCSR & MCF_PIT_PCSR_PIF) != 0;
24}
25
26static uint32_t mcf52235_tc_get_timecount(struct timecounter *tc)
27{
28  return rtems_timecounter_simple_downcounter_get(
29    tc,
30    mcf52235_tc_get,
31    mcf52235_tc_is_pending
32  );
33}
34
35static void mcf52235_tc_at_tick(rtems_timecounter_simple *tc)
36{
37  MCF_PIT1_PCSR |= MCF_PIT_PCSR_PIF;
38}
39
40static void mcf52235_tc_tick(void)
41{
42  rtems_timecounter_simple_downcounter_tick(
43    &mcf52235_tc,
44    mcf52235_tc_get,
45    mcf52235_tc_at_tick
46  );
47}
48
49/*
50 * Attach clock interrupt handler
51 */
52#define Clock_driver_support_install_isr( _new ) \
53  set_vector(_new, CLOCK_VECTOR, 1)
54
55/*
56 * Turn off the clock
57 */
58#define Clock_driver_support_shutdown_hardware() \
59  do { \
60    MCF_PIT1_PCSR &= ~MCF_PIT_PCSR_EN; \
61  } while (0)
62
63/*
64 * Set up the clock hardware
65 *
66 * We need to have 1 interrupt every rtems_configuration_get_microseconds_per_tick()
67 */
68static void Clock_driver_support_initialize_hardware(void)
69{
70  int level;
71  uint32_t pmr;
72  uint32_t preScaleCode = 0;
73  uint32_t clk = bsp_get_CPU_clock_speed() >> 1;
74  uint32_t tps = 1000000 / rtems_configuration_get_microseconds_per_tick();
75
76  while (preScaleCode < 15) {
77    pmr = (clk >> preScaleCode) / tps;
78    if (pmr < (1 << 15))
79      break;
80    preScaleCode++;
81  }
82
83  MCF_INTC0_ICR56 = MCF_INTC_ICR_IL(PIT3_IRQ_LEVEL) |
84    MCF_INTC_ICR_IP(PIT3_IRQ_PRIORITY);
85  rtems_interrupt_disable(level);
86  MCF_INTC0_IMRH &= ~MCF_INTC_IMRH_MASK56;
87  MCF_PIT1_PCSR &= ~MCF_PIT_PCSR_EN;
88  rtems_interrupt_enable(level);
89
90  MCF_PIT1_PCSR = MCF_PIT_PCSR_PRE(preScaleCode) |
91    MCF_PIT_PCSR_OVW | MCF_PIT_PCSR_PIE | MCF_PIT_PCSR_RLD;
92  MCF_PIT1_PMR = pmr;
93  MCF_PIT1_PCSR = MCF_PIT_PCSR_PRE(preScaleCode) |
94    MCF_PIT_PCSR_PIE | MCF_PIT_PCSR_RLD | MCF_PIT_PCSR_EN;
95
96  rtems_timecounter_simple_install(
97    &mcf52235_tc,
98    clk >> preScaleCode,
99    pmr,
100    mcf52235_tc_get_timecount
101  );
102}
103
104#define Clock_driver_timecounter_tick() mcf52235_tc_tick()
105
106#include "../../../shared/clockdrv_shell.h"
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