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MIPS: csrc-sb1250: Extract hpt cycle acquisition from sb1250_hpt_read 

This is to prepare for the upcoming read_sched_clock implementation, which
will also need to get cycles from the high precision timer.

Signed-off-by: Deng-Cheng Zhu <dengcheng.zhu@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: macro@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9486/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Deng-Cheng Zhu 2015-03-07 10:30:32 -08:00 committed by Ralf Baechle
parent 944081ac53
commit 02710fc851
1 changed files with 9 additions and 2 deletions
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11
arch/mips/kernel/csrc-sb1250.c
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@ -33,15 +33,22 @@
* The HPT is free running from SB1250_HPT_VALUE down to 0 then starts over
* again.
*/
static cycle_t sb1250_hpt_read(struct clocksource *cs)
static inline cycle_t sb1250_hpt_get_cycles(void)
{
unsigned int count;
void __iomem *addr;
count = G_SCD_TIMER_CNT(__raw_readq(IOADDR(A_SCD_TIMER_REGISTER(SB1250_HPT_NUM, R_SCD_TIMER_CNT))));
addr = IOADDR(A_SCD_TIMER_REGISTER(SB1250_HPT_NUM, R_SCD_TIMER_CNT));
count = G_SCD_TIMER_CNT(__raw_readq(addr));
return SB1250_HPT_VALUE - count;
}
static cycle_t sb1250_hpt_read(struct clocksource *cs)
{
return sb1250_hpt_get_cycles();
}
struct clocksource bcm1250_clocksource = {
.name = "bcm1250-counter-3",
.rating = 200,