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[S390] Move private simple udelay function to arch/s390/lib/delay.c.

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Move cio's private simple udelay function to lib/delay.c and turn it
into something much more readable. So we have all implementations
at one place.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens 2008-10-10 21:33:22 +02:00 committed by Martin Schwidefsky
parent b2300b9efe
commit 5a0d0e6537
3 changed files with 16 additions and 15 deletions
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1
arch/s390/include/asm/delay.h
View File

@ -15,6 +15,7 @@
#define _S390_DELAY_H
extern void __udelay(unsigned long usecs);
extern void udelay_simple(unsigned long usecs);
extern void __delay(unsigned long loops);
#define udelay(n) __udelay(n)

13
arch/s390/lib/delay.c
View File

@ -92,3 +92,16 @@ out:
local_irq_restore(flags);
preempt_enable();
}
/*
* Simple udelay variant. To be used on startup and reboot
* when the interrupt handler isn't working.
*/
void udelay_simple(unsigned long usecs)
{
u64 end;
end = get_clock() + ((u64) usecs << 12);
while (get_clock() < end)
cpu_relax();
}

17
drivers/s390/cio/cio.c
View File

@ -859,19 +859,6 @@ __disable_subchannel_easy(struct subchannel_id schid, struct schib *schib)
return -EBUSY; /* uhm... */
}
/* we can't use the normal udelay here, since it enables external interrupts */
static void udelay_reset(unsigned long usecs)
{
uint64_t start_cc, end_cc;
asm volatile ("STCK %0" : "=m" (start_cc));
do {
cpu_relax();
asm volatile ("STCK %0" : "=m" (end_cc));
} while (((end_cc - start_cc)/4096) < usecs);
}
static int
__clear_io_subchannel_easy(struct subchannel_id schid)
{
@ -887,7 +874,7 @@ __clear_io_subchannel_easy(struct subchannel_id schid)
if (schid_equal(&ti.schid, &schid))
return 0;
}
udelay_reset(100);
udelay_simple(100);
}
return -EBUSY;
}
@ -895,7 +882,7 @@ __clear_io_subchannel_easy(struct subchannel_id schid)
static void __clear_chsc_subchannel_easy(void)
{
/* It seems we can only wait for a bit here :/ */
udelay_reset(100);
udelay_simple(100);
}
static int pgm_check_occured;