blob: d5e18175363b455e8b5bbcdd93d6fc6ca49dd7af (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
|
/*
* Use the last periodic interval timer (PIT2) as the system clock.
*/
#include <rtems.h>
#include <rtems/timecounter.h>
#include <bsp.h>
/*
* Use INTC0 base
*/
#define CLOCK_VECTOR (64+56)
static rtems_timecounter_simple mcf52235_tc;
static uint32_t mcf52235_tc_get(rtems_timecounter_simple *tc)
{
return MCF_PIT1_PCNTR;
}
static bool mcf52235_tc_is_pending(rtems_timecounter_simple *tc)
{
return (MCF_PIT1_PCSR & MCF_PIT_PCSR_PIF) != 0;
}
static uint32_t mcf52235_tc_get_timecount(struct timecounter *tc)
{
return rtems_timecounter_simple_downcounter_get(
tc,
mcf52235_tc_get,
mcf52235_tc_is_pending
);
}
static void mcf52235_tc_at_tick(rtems_timecounter_simple *tc)
{
MCF_PIT1_PCSR |= MCF_PIT_PCSR_PIF;
}
static void mcf52235_tc_tick(void)
{
rtems_timecounter_simple_downcounter_tick(
&mcf52235_tc,
mcf52235_tc_get,
mcf52235_tc_at_tick
);
}
/*
* Attach clock interrupt handler
*/
#define Clock_driver_support_install_isr( _new ) \
set_vector(_new, CLOCK_VECTOR, 1)
/*
* Set up the clock hardware
*
* We need to have 1 interrupt every rtems_configuration_get_microseconds_per_tick()
*/
static void Clock_driver_support_initialize_hardware(void)
{
int level;
uint32_t pmr;
uint32_t preScaleCode = 0;
uint32_t clk = bsp_get_CPU_clock_speed() >> 1;
uint32_t tps = 1000000 / rtems_configuration_get_microseconds_per_tick();
while (preScaleCode < 15) {
pmr = (clk >> preScaleCode) / tps;
if (pmr < (1 << 15))
break;
preScaleCode++;
}
MCF_INTC0_ICR56 = MCF_INTC_ICR_IL(PIT3_IRQ_LEVEL) |
MCF_INTC_ICR_IP(PIT3_IRQ_PRIORITY);
rtems_interrupt_disable(level);
MCF_INTC0_IMRH &= ~MCF_INTC_IMRH_MASK56;
MCF_PIT1_PCSR &= ~MCF_PIT_PCSR_EN;
rtems_interrupt_enable(level);
MCF_PIT1_PCSR = MCF_PIT_PCSR_PRE(preScaleCode) |
MCF_PIT_PCSR_OVW | MCF_PIT_PCSR_PIE | MCF_PIT_PCSR_RLD;
MCF_PIT1_PMR = pmr;
MCF_PIT1_PCSR = MCF_PIT_PCSR_PRE(preScaleCode) |
MCF_PIT_PCSR_PIE | MCF_PIT_PCSR_RLD | MCF_PIT_PCSR_EN;
rtems_timecounter_simple_install(
&mcf52235_tc,
clk >> preScaleCode,
pmr,
mcf52235_tc_get_timecount
);
}
#define Clock_driver_timecounter_tick() mcf52235_tc_tick()
#include "../../../shared/dev/clock/clockimpl.h"
|