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-rw-r--r--Documentation/kernel-parameters.txt6
-rw-r--r--arch/i386/kernel/Makefile2
-rw-r--r--arch/i386/kernel/acpi/Makefile2
-rw-r--r--arch/i386/kernel/acpi/boot.c3
-rw-r--r--arch/i386/kernel/acpi/earlyquirk.c8
-rw-r--r--arch/i386/kernel/io_apic.c19
-rw-r--r--arch/i386/kernel/setup.c4
-rw-r--r--include/asm-i386/apic.h2
8 files changed, 40 insertions, 6 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index bad5987c472..fc99075e0af 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -335,6 +335,12 @@ running once the system is up.
timesource is not avalible, it defaults to PIT.
Format: { pit | tsc | cyclone | pmtmr }
+ disable_8254_timer
+ enable_8254_timer
+ [IA32/X86_64] Disable/Enable interrupt 0 timer routing
+ over the 8254 in addition to over the IO-APIC. The
+ kernel tries to set a sensible default.
+
hpet= [IA-32,HPET] option to disable HPET and use PIT.
Format: disable
diff --git a/arch/i386/kernel/Makefile b/arch/i386/kernel/Makefile
index 53bb9a79e27..65656c033d7 100644
--- a/arch/i386/kernel/Makefile
+++ b/arch/i386/kernel/Makefile
@@ -11,7 +11,7 @@ obj-y := process.o semaphore.o signal.o entry.o traps.o irq.o \
obj-y += cpu/
obj-y += timers/
-obj-$(CONFIG_ACPI) += acpi/
+obj-y += acpi/
obj-$(CONFIG_X86_BIOS_REBOOT) += reboot.o
obj-$(CONFIG_MCA) += mca.o
obj-$(CONFIG_X86_MSR) += msr.o
diff --git a/arch/i386/kernel/acpi/Makefile b/arch/i386/kernel/acpi/Makefile
index d51c7313cae..7e9ac99354f 100644
--- a/arch/i386/kernel/acpi/Makefile
+++ b/arch/i386/kernel/acpi/Makefile
@@ -1,4 +1,4 @@
-obj-y := boot.o
+obj-$(CONFIG_ACPI) += boot.o
obj-$(CONFIG_X86_IO_APIC) += earlyquirk.o
obj-$(CONFIG_ACPI_SLEEP) += sleep.o wakeup.o
diff --git a/arch/i386/kernel/acpi/boot.c b/arch/i386/kernel/acpi/boot.c
index 79577f0ace9..f1a21945963 100644
--- a/arch/i386/kernel/acpi/boot.c
+++ b/arch/i386/kernel/acpi/boot.c
@@ -1111,9 +1111,6 @@ int __init acpi_boot_table_init(void)
disable_acpi();
return error;
}
-#ifdef __i386__
- check_acpi_pci();
-#endif
acpi_table_parse(ACPI_BOOT, acpi_parse_sbf);
diff --git a/arch/i386/kernel/acpi/earlyquirk.c b/arch/i386/kernel/acpi/earlyquirk.c
index f1b9d2a46da..2e3b643a4dc 100644
--- a/arch/i386/kernel/acpi/earlyquirk.c
+++ b/arch/i386/kernel/acpi/earlyquirk.c
@@ -7,14 +7,22 @@
#include <linux/pci.h>
#include <asm/pci-direct.h>
#include <asm/acpi.h>
+#include <asm/apic.h>
static int __init check_bridge(int vendor, int device)
{
+#ifdef CONFIG_ACPI
/* According to Nvidia all timer overrides are bogus. Just ignore
them all. */
if (vendor == PCI_VENDOR_ID_NVIDIA) {
acpi_skip_timer_override = 1;
}
+#endif
+ if (vendor == PCI_VENDOR_ID_ATI && timer_over_8254 == 1) {
+ timer_over_8254 = 0;
+ printk(KERN_INFO "ATI board detected. Disabling timer routing "
+ "over 8254.\n");
+ }
return 0;
}
diff --git a/arch/i386/kernel/io_apic.c b/arch/i386/kernel/io_apic.c
index 235822b3f41..39d9a5fa907 100644
--- a/arch/i386/kernel/io_apic.c
+++ b/arch/i386/kernel/io_apic.c
@@ -51,6 +51,8 @@ static struct { int pin, apic; } ioapic_i8259 = { -1, -1 };
static DEFINE_SPINLOCK(ioapic_lock);
+int timer_over_8254 __initdata = 1;
+
/*
* Is the SiS APIC rmw bug present ?
* -1 = don't know, 0 = no, 1 = yes
@@ -2267,7 +2269,8 @@ static inline void check_timer(void)
apic_write_around(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_EXTINT);
init_8259A(1);
timer_ack = 1;
- enable_8259A_irq(0);
+ if (timer_over_8254 > 0)
+ enable_8259A_irq(0);
pin1 = find_isa_irq_pin(0, mp_INT);
apic1 = find_isa_irq_apic(0, mp_INT);
@@ -2392,6 +2395,20 @@ void __init setup_IO_APIC(void)
print_IO_APIC();
}
+static int __init setup_disable_8254_timer(char *s)
+{
+ timer_over_8254 = -1;
+ return 1;
+}
+static int __init setup_enable_8254_timer(char *s)
+{
+ timer_over_8254 = 2;
+ return 1;
+}
+
+__setup("disable_8254_timer", setup_disable_8254_timer);
+__setup("enable_8254_timer", setup_enable_8254_timer);
+
/*
* Called after all the initialization is done. If we didnt find any
* APIC bugs then we can allow the modify fast path
diff --git a/arch/i386/kernel/setup.c b/arch/i386/kernel/setup.c
index 51e513b4f72..ab62a9f4701 100644
--- a/arch/i386/kernel/setup.c
+++ b/arch/i386/kernel/setup.c
@@ -1599,6 +1599,10 @@ void __init setup_arch(char **cmdline_p)
if (efi_enabled)
efi_map_memmap();
+#ifdef CONFIG_X86_IO_APIC
+ check_acpi_pci(); /* Checks more than just ACPI actually */
+#endif
+
#ifdef CONFIG_ACPI
/*
* Parse the ACPI tables for possible boot-time SMP configuration.
diff --git a/include/asm-i386/apic.h b/include/asm-i386/apic.h
index d30b8571573..ff9ac8d19eb 100644
--- a/include/asm-i386/apic.h
+++ b/include/asm-i386/apic.h
@@ -137,6 +137,8 @@ void switch_APIC_timer_to_ipi(void *cpumask);
void switch_ipi_to_APIC_timer(void *cpumask);
#define ARCH_APICTIMER_STOPS_ON_C3 1
+extern int timer_over_8254;
+
#else /* !CONFIG_X86_LOCAL_APIC */
static inline void lapic_shutdown(void) { }