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x86: HPET try to activate force detected hpet 

Enable HPET later during boot, after the force detect in PCI quirks.  Also add
a call to repeat the force enabling at resume time.

Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Cc: Andi Kleen <ak@suse.de>
Cc: john stultz <johnstul@us.ibm.com>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Venki Pallipadi 2007-10-12 23:04:23 +02:00 committed by Thomas Gleixner
parent d54bd57d65
commit 59c69f2a51
2 changed files with 26 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

27
arch/x86/kernel/hpet.c
View File

@ -164,6 +164,7 @@ static struct clock_event_device hpet_clockevent = {
.set_next_event = hpet_legacy_next_event,
.shift = 32,
.irq = 0,
.rating = 50,
};
static void hpet_start_counter(void)
@ -178,6 +179,17 @@ static void hpet_start_counter(void)
hpet_writel(cfg, HPET_CFG);
}
static void hpet_resume_device(void)
{
ich_force_hpet_resume();
}
static void hpet_restart_counter(void)
{
hpet_resume_device();
hpet_start_counter();
}
static void hpet_enable_legacy_int(void)
{
unsigned long cfg = hpet_readl(HPET_CFG);
@ -299,7 +311,7 @@ static struct clocksource clocksource_hpet = {
.mask = HPET_MASK,
.shift = HPET_SHIFT,
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
.resume = hpet_start_counter,
.resume = hpet_restart_counter,
#ifdef CONFIG_X86_64
.vread = vread_hpet,
#endif
@ -412,10 +424,21 @@ out_nohpet:
*/
static __init int hpet_late_init(void)
{
if (!is_hpet_capable())
if (boot_hpet_disable)
return -ENODEV;
if (!hpet_address) {
if (!force_hpet_address)
return -ENODEV;
hpet_address = force_hpet_address;
hpet_enable();
if (!hpet_virt_address)
return -ENODEV;
}
hpet_reserve_platform_timers(hpet_readl(HPET_ID));
return 0;
}
fs_initcall(hpet_late_init);

1
include/asm-x86/hpet.h
View File

@ -63,6 +63,7 @@
/* hpet memory map physical address */
extern unsigned long hpet_address;
extern unsigned long force_hpet_address;
extern int is_hpet_enabled(void);
extern int hpet_enable(void);
extern unsigned long hpet_readl(unsigned long a);