Make the TSC a run-time specifier only

Also localises the parameters and setup into kernel/timers

Adds an external flag so that the tsc can be disabled from the
machine specific setup (used by voyager)

arch/i386/Kconfig

@@ -280,11 +280,6 @@ config X86_ALIGNMENT_16
 	depends on MWINCHIP3D || MWINCHIP2 || MWINCHIPC6 || MCYRIXIII || MELAN || MK6 || M586MMX || M586TSC || M586 || M486
 	default y
 
-config X86_TSC
-	bool
-	depends on MWINCHIP3D || MWINCHIP2 || MCRUSOE || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMIII || M686 || M586MMX || M586TSC
-	default y
-
 config X86_GOOD_APIC
 	bool
 	depends on MK7 || MPENTIUM4 || MPENTIUMIII || M686 || M586MMX

arch/i386/kernel/cpu/common.c

@@ -45,25 +45,6 @@ static int __init cachesize_setup(char *str)
 }
 __setup("cachesize=", cachesize_setup);
 
-#ifndef CONFIG_X86_TSC
-static int tsc_disable __initdata = 0;
-
-static int __init tsc_setup(char *str)
-{
-	tsc_disable = 1;
-	return 1;
-}
-#else
-#define tsc_disable 0
-
-static int __init tsc_setup(char *str)
-{
-	printk("notsc: Kernel compiled with CONFIG_X86_TSC, cannot disable TSC.\n");
-	return 1;
-}
-#endif
-__setup("notsc", tsc_setup);
-
 int __init get_model_name(struct cpuinfo_x86 *c)
 {
 	unsigned int *v;

arch/i386/kernel/timers/Makefile

@@ -2,8 +2,6 @@
 # Makefile for x86 timers
 #
 
-obj-y := timer.o
+obj-y := timer.o timer_tsc.o timer_pit.o
 
-obj-y += timer_tsc.o
-obj-y += timer_pit.o
-obj-$(CONFIG_X86_CYCLONE)   += timer_cyclone.o
+obj-$(CONFIG_X86_CYCLONE)	+= timer_cyclone.o

arch/i386/kernel/timers/timer.c

@@ -8,9 +8,7 @@ extern struct timer_opts timer_tsc;
 /* list of timers, ordered by preference, NULL terminated */
 static struct timer_opts* timers[] = {
 	&timer_tsc,
-#ifndef CONFIG_X86_TSC
 	&timer_pit,
-#endif
 	NULL,
 };
 

arch/i386/kernel/timers/timer_pit.c

@@ -9,7 +9,9 @@
 #include <linux/irq.h>
 #include <asm/mpspec.h>
 #include <asm/timer.h>
+#include <asm/smp.h>
 #include <asm/io.h>
+#include <asm/arch_hooks.h>
 
 extern spinlock_t i8259A_lock;
 extern spinlock_t i8253_lock;

arch/i386/kernel/timers/timer_tsc.c

@@ -11,6 +11,10 @@
 
 #include <asm/timer.h>
 #include <asm/io.h>
+/* processor.h for distable_tsc flag */
+#include <asm/processor.h>
+
+int tsc_disable __initdata = 0;
 
 extern int x86_udelay_tsc;
 extern spinlock_t i8253_lock;
@@ -287,6 +291,18 @@ static int init_tsc(void)
 	return -ENODEV;
 }
 
+/* disable flag for tsc.  Takes effect by clearing the TSC cpu flag
+ * in cpu/common.c */
+static int __init tsc_setup(char *str)
+{
+	tsc_disable = 1;
+	return 1;
+}
+
+__setup("notsc", tsc_setup);
+
+
+
 /************************************************************/
 
 /* tsc timer_opts struct */

arch/i386/mach-voyager/setup.c

@@ -29,6 +29,9 @@ void __init intr_init_hook(void)
 
 void __init pre_setup_arch_hook(void)
 {
+	/* Voyagers run their CPUs from independent clocks, so disable
+	 * the TSC code because we can't sync them */
+	tsc_disable = 1;
 }
 
 void __init trap_init_hook(void)

include/asm-i386/processor.h

@@ -19,6 +19,9 @@
 #include <linux/config.h>
 #include <linux/threads.h>
 
+/* flag for disabling the tsc */
+extern int tsc_disable;
+
 struct desc_struct {
 	unsigned long a,b;
 };