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x86: HPET_MSI Refactor code in preparation for HPET_MSI

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Preparatory patch before the actual HPET MSI changes. Sets up hpet_set_mode
and hpet_next_event for the MSI related changes. Just the code
refactoring and should be zero functional change.

Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Shaohua Li <shaohua.li@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
venkatesh.pallipadi@intel.com 2008-09-05 18:02:16 -07:00 committed by Ingo Molnar
parent 932775a4ab
commit b40d575bf0
1 changed files with 27 additions and 15 deletions
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42
arch/x86/kernel/hpet.c
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@ -227,44 +227,44 @@ static void hpet_legacy_clockevent_register(void)
printk(KERN_DEBUG "hpet clockevent registered\n");
}
static void hpet_legacy_set_mode(enum clock_event_mode mode,
struct clock_event_device *evt)
static void hpet_set_mode(enum clock_event_mode mode,
struct clock_event_device *evt, int timer)
{
unsigned long cfg, cmp, now;
uint64_t delta;
switch(mode) {
case CLOCK_EVT_MODE_PERIODIC:
delta = ((uint64_t)(NSEC_PER_SEC/HZ)) * hpet_clockevent.mult;
delta >>= hpet_clockevent.shift;
delta = ((uint64_t)(NSEC_PER_SEC/HZ)) * evt->mult;
delta >>= evt->shift;
now = hpet_readl(HPET_COUNTER);
cmp = now + (unsigned long) delta;
cfg = hpet_readl(HPET_T0_CFG);
cfg = hpet_readl(HPET_Tn_CFG(timer));
cfg |= HPET_TN_ENABLE | HPET_TN_PERIODIC |
HPET_TN_SETVAL | HPET_TN_32BIT;
hpet_writel(cfg, HPET_T0_CFG);
hpet_writel(cfg, HPET_Tn_CFG(timer));
/*
* The first write after writing TN_SETVAL to the
* config register sets the counter value, the second
* write sets the period.
*/
hpet_writel(cmp, HPET_T0_CMP);
hpet_writel(cmp, HPET_Tn_CMP(timer));
udelay(1);
hpet_writel((unsigned long) delta, HPET_T0_CMP);
hpet_writel((unsigned long) delta, HPET_Tn_CMP(timer));
break;
case CLOCK_EVT_MODE_ONESHOT:
cfg = hpet_readl(HPET_T0_CFG);
cfg = hpet_readl(HPET_Tn_CFG(timer));
cfg &= ~HPET_TN_PERIODIC;
cfg |= HPET_TN_ENABLE | HPET_TN_32BIT;
hpet_writel(cfg, HPET_T0_CFG);
hpet_writel(cfg, HPET_Tn_CFG(timer));
break;
case CLOCK_EVT_MODE_UNUSED:
case CLOCK_EVT_MODE_SHUTDOWN:
cfg = hpet_readl(HPET_T0_CFG);
cfg = hpet_readl(HPET_Tn_CFG(timer));
cfg &= ~HPET_TN_ENABLE;
hpet_writel(cfg, HPET_T0_CFG);
hpet_writel(cfg, HPET_Tn_CFG(timer));
break;
case CLOCK_EVT_MODE_RESUME:
@ -273,14 +273,14 @@ static void hpet_legacy_set_mode(enum clock_event_mode mode,
}
}
static int hpet_legacy_next_event(unsigned long delta,
struct clock_event_device *evt)
static int hpet_next_event(unsigned long delta,
struct clock_event_device *evt, int timer)
{
u32 cnt;
cnt = hpet_readl(HPET_COUNTER);
cnt += (u32) delta;
hpet_writel(cnt, HPET_T0_CMP);
hpet_writel(cnt, HPET_Tn_CMP(timer));
/*
* We need to read back the CMP register to make sure that
@ -292,6 +292,18 @@ static int hpet_legacy_next_event(unsigned long delta,
return (s32)((u32)hpet_readl(HPET_COUNTER) - cnt) >= 0 ? -ETIME : 0;
}
static void hpet_legacy_set_mode(enum clock_event_mode mode,
struct clock_event_device *evt)
{
hpet_set_mode(mode, evt, 0);
}
static int hpet_legacy_next_event(unsigned long delta,
struct clock_event_device *evt)
{
return hpet_next_event(delta, evt, 0);
}
/*
* Clock source related code
*/