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git.ipfire.org Git - thirdparty/u-boot.git/blob - arch/avr32/cpu/interrupts.c
2 * Copyright (C) 2004-2006 Atmel Corporation
4 * SPDX-License-Identifier: GPL-2.0+
11 #include <asm/processor.h>
12 #include <asm/sysreg.h>
14 #include <asm/arch/hardware.h>
16 #define HANDLER_MASK 0x00ffffff
17 #define INTLEV_SHIFT 30
18 #define INTLEV_MASK 0x00000003
20 DECLARE_GLOBAL_DATA_PTR
;
22 /* Incremented whenever COUNT reaches 0xffffffff by timer_interrupt_handler */
23 volatile unsigned long timer_overflow
;
26 * Instead of dividing by get_tbclk(), multiply by this constant and
27 * right-shift the result by 32 bits.
29 static unsigned long tb_factor
;
31 unsigned long get_tbclk(void)
33 return gd
->arch
.cpu_hz
;
36 unsigned long long get_ticks(void)
38 unsigned long lo
, hi_now
, hi_prev
;
41 hi_prev
= timer_overflow
;
42 lo
= sysreg_read(COUNT
);
43 hi_now
= timer_overflow
;
44 } while (hi_prev
!= hi_now
);
46 return ((unsigned long long)hi_now
<< 32) | lo
;
49 unsigned long get_timer(unsigned long base
)
51 u64 now
= get_ticks();
54 return (unsigned long)(now
>> 32) - base
;
58 * For short delays only. It will overflow after a few seconds.
60 void __udelay(unsigned long usec
)
66 base
= sysreg_read(COUNT
);
67 cycles
= ((usec
* (get_tbclk() / 10000)) + 50) / 100;
70 now
= sysreg_read(COUNT
);
71 } while ((now
- base
) < cycles
);
74 static int set_interrupt_handler(unsigned int nr
, void (*handler
)(void),
75 unsigned int priority
)
77 extern void _evba(void);
79 unsigned long handler_addr
= (unsigned long)handler
;
81 handler_addr
-= (unsigned long)&_evba
;
83 if ((handler_addr
& HANDLER_MASK
) != handler_addr
84 || (priority
& INTLEV_MASK
) != priority
)
87 intpr
= (handler_addr
& HANDLER_MASK
);
88 intpr
|= (priority
& INTLEV_MASK
) << INTLEV_SHIFT
;
89 writel(intpr
, (void *)ATMEL_BASE_INTC
+ 4 * nr
);
96 extern void timer_interrupt_handler(void);
99 sysreg_write(COUNT
, 0);
101 tmp
= (u64
)CONFIG_SYS_HZ
<< 32;
102 tmp
+= gd
->arch
.cpu_hz
/ 2;
103 do_div(tmp
, gd
->arch
.cpu_hz
);
104 tb_factor
= (u32
)tmp
;
106 if (set_interrupt_handler(0, &timer_interrupt_handler
, 3))
109 /* For all practical purposes, this gives us an overflow interrupt */
110 sysreg_write(COMPARE
, 0xffffffff);