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Subject[PATCH 4/7] ICH Force HPET: Late initialization of hpet after quirk


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>

---
arch/i386/kernel/hpet.c | 50 +++++++++++++++++++++++++++++++++++++++++++-----
include/asm-i386/hpet.h | 1
2 files changed, 46 insertions(+), 5 deletions(-)

Index: linux-2.6.22-rc5/include/asm-i386/hpet.h
===================================================================
--- linux-2.6.22-rc5.orig/include/asm-i386/hpet.h 2007-06-17 08:52:10.000000000 +0200
+++ linux-2.6.22-rc5/include/asm-i386/hpet.h 2007-06-17 08:52:10.000000000 +0200
@@ -64,6 +64,7 @@

/* 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);

Index: linux-2.6.22-rc5/arch/i386/kernel/hpet.c
===================================================================
--- linux-2.6.22-rc5.orig/arch/i386/kernel/hpet.c 2007-06-17 08:52:10.000000000 +0200
+++ linux-2.6.22-rc5/arch/i386/kernel/hpet.c 2007-06-17 08:52:10.000000000 +0200
@@ -25,6 +25,8 @@ extern struct clock_event_device *global
*/
unsigned long hpet_address;

+static void __iomem * hpet_virt_address;
+
#ifdef CONFIG_X86_64

#include <asm/pgtable.h>
@@ -34,19 +36,22 @@ static inline void hpet_set_mapping(void
{
set_fixmap_nocache(FIX_HPET_BASE, hpet_address);
__set_fixmap(VSYSCALL_HPET, hpet_address, PAGE_KERNEL_VSYSCALL_NOCACHE);
+ hpet_virt_address = (void __iomem *)fix_to_virt(FIX_HPET_BASE);
+
}

static inline void __iomem *hpet_get_virt_address(void)
{
- return (void __iomem *)fix_to_virt(FIX_HPET_BASE);
+ return hpet_virt_address;
}

-static inline void hpet_clear_mapping(void) { }
+static inline void hpet_clear_mapping(void)
+{
+ hpet_virt_address = NULL;
+}

#else

-static void __iomem * hpet_virt_address;
-
static inline unsigned long hpet_readl(unsigned long a)
{
return readl(hpet_virt_address + a);
@@ -173,6 +178,7 @@ static struct clock_event_device hpet_cl
.set_next_event = hpet_legacy_next_event,
.shift = 32,
.irq = 0,
+ .rating = 50,
};

static void hpet_start_counter(void)
@@ -187,6 +193,17 @@ 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);
@@ -308,7 +325,7 @@ static struct clocksource clocksource_hp
.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
@@ -372,6 +389,9 @@ int __init hpet_enable(void)
{
unsigned long id;

+ if (hpet_get_virt_address())
+ return 0;
+
if (!is_hpet_capable())
return 0;

@@ -416,6 +436,26 @@ out_nohpet:
}


+static int __init hpet_late_init(void)
+{
+ if (boot_hpet_disable)
+ return -ENODEV;
+
+ if (!hpet_address) {
+ if (!force_hpet_address)
+ return -ENODEV;
+
+ hpet_address = force_hpet_address;
+ hpet_enable();
+ if (!hpet_get_virt_address())
+ return -ENODEV;
+ }
+
+ return 0;
+}
+fs_initcall(hpet_late_init);
+
+
#ifdef CONFIG_HPET_EMULATE_RTC

/* HPET in LegacyReplacement Mode eats up RTC interrupt line. When, HPET
-
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