diff options
| author | OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> | 2007-12-03 17:17:10 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2007-12-03 17:17:10 +0100 |
| commit | c86c7fbc829e27e2a4093f98ded9fbd75e515adb (patch) | |
| tree | 310d217b4b2e582d84798e65dac309f1d173f1ad /arch/x86/kernel | |
| parent | 92d499d991ec4f5cbd00d6f33967eab9d3ee8d6c (diff) | |
x86: disable hpet on shutdown
If HPET was enabled by pci quirks, we use i8253 as initial clockevent
because pci quirks doesn't run until pci is initialized.
The above means the kernel (or something) is assuming HPET legacy
replacement is disabled and can use i8253 at boot.
If we used kexec, it isn't true. So, this patch disables HPET legacy
replacement for kexec in machine_shutdown().
Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Acked-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86/kernel')
| -rw-r--r-- | arch/x86/kernel/hpet.c | 14 | ||||
| -rw-r--r-- | arch/x86/kernel/reboot_32.c | 4 | ||||
| -rw-r--r-- | arch/x86/kernel/reboot_64.c | 4 |
3 files changed, 22 insertions, 0 deletions
diff --git a/arch/x86/kernel/hpet.c b/arch/x86/kernel/hpet.c index 53303f2e547..4a86ffd67ec 100644 --- a/arch/x86/kernel/hpet.c +++ b/arch/x86/kernel/hpet.c @@ -446,6 +446,20 @@ static __init int hpet_late_init(void) } fs_initcall(hpet_late_init); +void hpet_disable(void) +{ + if (is_hpet_capable()) { + unsigned long cfg = hpet_readl(HPET_CFG); + + if (hpet_legacy_int_enabled) { + cfg &= ~HPET_CFG_LEGACY; + hpet_legacy_int_enabled = 0; + } + cfg &= ~HPET_CFG_ENABLE; + hpet_writel(cfg, HPET_CFG); + } +} + #ifdef CONFIG_HPET_EMULATE_RTC /* HPET in LegacyReplacement Mode eats up RTC interrupt line. When, HPET diff --git a/arch/x86/kernel/reboot_32.c b/arch/x86/kernel/reboot_32.c index 9e2269d0091..bb1a0f889c5 100644 --- a/arch/x86/kernel/reboot_32.c +++ b/arch/x86/kernel/reboot_32.c @@ -11,6 +11,7 @@ #include <linux/reboot.h> #include <asm/uaccess.h> #include <asm/apic.h> +#include <asm/hpet.h> #include <asm/desc.h> #include "mach_reboot.h" #include <asm/reboot_fixups.h> @@ -326,6 +327,9 @@ static void native_machine_shutdown(void) #ifdef CONFIG_X86_IO_APIC disable_IO_APIC(); #endif +#ifdef CONFIG_HPET_TIMER + hpet_disable(); +#endif } void __attribute__((weak)) mach_reboot_fixups(void) diff --git a/arch/x86/kernel/reboot_64.c b/arch/x86/kernel/reboot_64.c index 71b13c5f581..53620a92a8f 100644 --- a/arch/x86/kernel/reboot_64.c +++ b/arch/x86/kernel/reboot_64.c @@ -17,6 +17,7 @@ #include <asm/pgtable.h> #include <asm/tlbflush.h> #include <asm/apic.h> +#include <asm/hpet.h> #include <asm/gart.h> /* @@ -113,6 +114,9 @@ void machine_shutdown(void) disable_IO_APIC(); +#ifdef CONFIG_HPET_TIMER + hpet_disable(); +#endif local_irq_restore(flags); pci_iommu_shutdown(); |