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git.ipfire.org Git - people/ms/u-boot.git/blob - cpu/s3c44b0/interrupts.c
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28 #include <asm/hardware.h>
30 /* we always count down the max. */
31 #define TIMER_LOAD_VAL 0xffff
33 /* macro to read the 16 bit timer */
34 #define READ_TIMER (TCNTO1 & 0xffff)
37 #error CONFIG_USE_IRQ NOT supported
40 static ulong timestamp
;
43 int interrupt_init (void)
48 TCNTB1
= TIMER_LOAD_VAL
;
54 lastdec
= TCNTB1
= TIMER_LOAD_VAL
;
60 * timer without interrupts
63 void reset_timer (void)
65 reset_timer_masked ();
68 ulong
get_timer (ulong base
)
70 return get_timer_masked () - base
;
73 void set_timer (ulong t
)
78 void udelay (unsigned long usec
)
88 while (get_timer_masked () < tmo
)
92 void reset_timer_masked (void)
99 ulong
get_timer_masked (void)
101 ulong now
= READ_TIMER
;
103 if (lastdec
>= now
) {
105 timestamp
+= lastdec
- now
;
107 /* we have an overflow ... */
108 timestamp
+= lastdec
+ TIMER_LOAD_VAL
- now
;
115 void udelay_masked (unsigned long usec
)
123 tmo
*= CONFIG_SYS_HZ
;
126 tmo
= usec
* CONFIG_SYS_HZ
;
130 endtime
= get_timer(0) + tmo
;
133 ulong now
= get_timer_masked ();
134 diff
= endtime
- now
;