1 // SPDX-License-Identifier: GPL-2.0-only
5 * Linux architectural port borrowing liberally from similar works of
6 * others. All original copyrights apply as per the original source
9 * Modifications for the OpenRISC architecture:
10 * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
15 #include <linux/kernel.h>
16 #include <linux/export.h>
17 #include <linux/init.h>
18 #include <linux/timex.h>
19 #include <asm/param.h>
20 #include <asm/delay.h>
21 #include <asm/timex.h>
22 #include <asm/processor.h>
24 int read_current_timer(unsigned long *timer_value
)
26 *timer_value
= get_cycles();
30 void __delay(unsigned long cycles
)
32 cycles_t start
= get_cycles();
34 while ((get_cycles() - start
) < cycles
)
37 EXPORT_SYMBOL(__delay
);
39 inline void __const_udelay(unsigned long xloops
)
41 unsigned long long loops
;
43 loops
= (unsigned long long)xloops
* loops_per_jiffy
* HZ
;
47 EXPORT_SYMBOL(__const_udelay
);
49 void __udelay(unsigned long usecs
)
51 __const_udelay(usecs
* 0x10C7UL
); /* 2**32 / 1000000 (rounded up) */
53 EXPORT_SYMBOL(__udelay
);
55 void __ndelay(unsigned long nsecs
)
57 __const_udelay(nsecs
* 0x5UL
); /* 2**32 / 1000000000 (rounded up) */
59 EXPORT_SYMBOL(__ndelay
);