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Blackfin arch: add functions for converting between sclks and usecs 

Signed-off-by: Mike Frysinger <michael.frysinger@analog.com>
Signed-off-by: Bryan Wu <bryan.wu@analog.com>
This commit is contained in:
Mike Frysinger 2007-10-21 22:59:49 +08:00 committed by Bryan Wu
parent b0a68dc07e
commit 2f6cf7bfc6
2 changed files with 15 additions and 1 deletions
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14
arch/blackfin/kernel/setup.c
View File

@ -459,7 +459,7 @@ static u_long get_vco(void)
return vco;
}
/*Get the Core clock*/
/* Get the Core clock */
u_long get_cclk(void)
{
u_long csel, ssel;
@ -493,6 +493,18 @@ u_long get_sclk(void)
}
EXPORT_SYMBOL(get_sclk);
unsigned long sclk_to_usecs(unsigned long sclk)
{
return (USEC_PER_SEC * (u64)sclk) / get_sclk();
}
EXPORT_SYMBOL(sclk_to_usecs);
unsigned long usecs_to_sclk(unsigned long usecs)
{
return get_sclk() / (USEC_PER_SEC * (u64)usecs);
}
EXPORT_SYMBOL(usecs_to_sclk);
/*
* Get CPU information for use by the procfs.
*/

2
include/asm-blackfin/bfin-global.h
View File

@ -47,6 +47,8 @@
extern unsigned long get_cclk(void);
extern unsigned long get_sclk(void);
extern unsigned long sclk_to_usecs(unsigned long sclk);
extern unsigned long usecs_to_sclk(unsigned long usecs);
extern void dump_thread(struct pt_regs *regs, struct user *dump);
extern void dump_bfin_regs(struct pt_regs *fp, void *retaddr);