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i386: prepare sharing the hpet code with x86_64 

Add the x8664 specific bits (mapping) to share the hpet code later.

Move the reserve_platform_timer call to late init. This is necessary
for x86_64, as hpet enable() is called before memory is setup. i386
calls it in late_time_init, but it does not hurt to do it later for
both.

Pull in the x8664 hpet disable command line option as well.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
This commit is contained in:
Thomas Gleixner 2007-10-12 23:04:06 +02:00 committed by Thomas Gleixner
parent 06a24dec10
commit 28769149c2
1 changed files with 58 additions and 1 deletions
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59
arch/x86/kernel/hpet_32.c
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@ -1,5 +1,6 @@
#include <linux/clocksource.h>
#include <linux/clockchips.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/hpet.h>
#include <linux/init.h>
@ -7,6 +8,7 @@
#include <linux/pm.h>
#include <linux/delay.h>
#include <asm/fixmap.h>
#include <asm/hpet.h>
#include <asm/i8253.h>
#include <asm/io.h>
@ -23,6 +25,10 @@
unsigned long hpet_address;
static void __iomem *hpet_virt_address;
/* Temporary hack. Cleanup after x86_64 clock events conversion */
#undef hpet_readl
#undef hpet_writel
static inline unsigned long hpet_readl(unsigned long a)
{
return readl(hpet_virt_address + a);
@ -33,6 +39,24 @@ static inline void hpet_writel(unsigned long d, unsigned long a)
writel(d, hpet_virt_address + a);
}
#ifdef CONFIG_X86_64
#include <asm/pgtable.h>
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 hpet_clear_mapping(void)
{
hpet_virt_address = NULL;
}
#else
static inline void hpet_set_mapping(void)
{
hpet_virt_address = ioremap_nocache(hpet_address, HPET_MMAP_SIZE);
@ -43,6 +67,7 @@ static inline void hpet_clear_mapping(void)
iounmap(hpet_virt_address);
hpet_virt_address = NULL;
}
#endif
/*
* HPET command line enable / disable
@ -59,6 +84,13 @@ static int __init hpet_setup(char* str)
}
__setup("hpet=", hpet_setup);
static int __init disable_hpet(char *str)
{
boot_hpet_disable = 1;
return 1;
}
__setup("nohpet", disable_hpet);
static inline int is_hpet_capable(void)
{
return (!boot_hpet_disable && hpet_address);
@ -225,6 +257,13 @@ static cycle_t read_hpet(void)
return (cycle_t)hpet_readl(HPET_COUNTER);
}
#ifdef CONFIG_X86_64
static cycle_t __vsyscall_fn vread_hpet(void)
{
return readl((const void __iomem *)fix_to_virt(VSYSCALL_HPET) + 0xf0);
}
#endif
static struct clocksource clocksource_hpet = {
.name = "hpet",
.rating = 250,
@ -233,6 +272,9 @@ static struct clocksource clocksource_hpet = {
.shift = HPET_SHIFT,
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
.resume = hpet_start_counter,
#ifdef CONFIG_X86_64
.vread = vread_hpet,
#endif
};
/*
@ -331,7 +373,6 @@ int __init hpet_enable(void)
if (id & HPET_ID_LEGSUP) {
hpet_enable_int();
hpet_reserve_platform_timers(id);
/*
* Start hpet with the boot cpu mask and make it
* global after the IO_APIC has been initialized.
@ -349,6 +390,22 @@ out_nohpet:
return 0;
}
/*
* Needs to be late, as the reserve_timer code calls kalloc !
*
* Not a problem on i386 as hpet_enable is called from late_time_init,
* but on x86_64 it is necessary !
*/
static __init int hpet_late_init(void)
{
if (!is_hpet_capable())
return -ENODEV;
hpet_reserve_platform_timers(hpet_readl(HPET_ID));
return 0;
}
fs_initcall(hpet_late_init);
#ifdef CONFIG_HPET_EMULATE_RTC
/* HPET in LegacyReplacement Mode eats up RTC interrupt line. When, HPET