time: move PIT_TICK_RATE to linux/timex.h

PIT_TICK_RATE is currently defined in four architectures, but in three
different places. While linux/timex.h is not the perfect place for it, it
is still a reasonable replacement for those drivers that traditionally use
asm/timex.h to get CLOCK_TICK_RATE and expect it to be the PIT frequency.

Note that for Alpha, the actual value changed from 1193182UL to 1193180UL.
This is unlikely to make a difference, and probably can only improve
accuracy. There was a discussion on the correct value of CLOCK_TICK_RATE
a few years ago, after which every existing instance was getting changed
to 1193182. According to the specification, it should be
1193181.818181...

Signed-off-by: Arnd Bergmann <[e-mail]>
Cc: Richard Henderson <[e-mail]>
Cc: Ivan Kokshaysky <[e-mail]>
Cc: Ralf Baechle <[e-mail]>
Cc: Benjamin Herrenschmidt <[e-mail]>
Cc: Ingo Molnar <[e-mail]>
Cc: Thomas Gleixner <[e-mail]>
Cc: "H. Peter Anvin" <[e-mail]>
Cc: Len Brown <[e-mail]>
Cc: john stultz <[e-mail]>
Cc: Dmitry Torokhov <[e-mail]>
Cc: Takashi Iwai <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

arch/alpha/include/asm/8253pit.h

···
 /*
  * 8253/8254 Programmable Interval Timer
  */
-
-#ifndef _8253PIT_H
-#define _8253PIT_H
-
-#define PIT_TICK_RATE 	1193180UL
-
-#endif

arch/alpha/kernel/sys_ruffian.c

···
 #include <linux/sched.h>
 #include <linux/pci.h>
 #include <linux/ioport.h>
+#include <linux/timex.h>
 #include <linux/init.h>
 
 #include <asm/ptrace.h>

arch/mips/include/asm/i8253.h

···
 #define PIT_CH0			0x40
 #define PIT_CH2			0x42
 
-#define PIT_TICK_RATE		1193182UL
-
 extern spinlock_t i8253_lock;
 
 extern void setup_pit_timer(void);

arch/powerpc/include/asm/8253pit.h

···
-#ifndef _ASM_POWERPC_8253PIT_H
-#define _ASM_POWERPC_8253PIT_H
-
 /*
  * 8253/8254 Programmable Interval Timer
  */
-
-#define PIT_TICK_RATE	1193182UL
-
-#endif	/* _ASM_POWERPC_8253PIT_H */

arch/x86/include/asm/timex.h

···
 #include <asm/processor.h>
 #include <asm/tsc.h>
 
-/* The PIT ticks at this frequency (in HZ): */
-#define PIT_TICK_RATE		1193182
-
+/* Assume we use the PIT time source for the clock tick */
 #define CLOCK_TICK_RATE		PIT_TICK_RATE
 
 #define ARCH_HAS_READ_CURRENT_TIMER

arch/x86/kernel/i8253.c

···
 #include <linux/spinlock.h>
 #include <linux/jiffies.h>
 #include <linux/module.h>
+#include <linux/timex.h>
 #include <linux/delay.h>
 #include <linux/init.h>
 #include <linux/io.h>

arch/x86/kernel/tsc.c

···
 #include <linux/delay.h>
 #include <linux/clocksource.h>
 #include <linux/percpu.h>
+#include <linux/timex.h>
 
 #include <asm/hpet.h>
 #include <asm/timer.h>

drivers/clocksource/acpi_pm.c

···
 
 #include <linux/acpi_pmtmr.h>
 #include <linux/clocksource.h>
+#include <linux/timex.h>
 #include <linux/errno.h>
 #include <linux/init.h>
 #include <linux/pci.h>

drivers/input/joystick/analog.c

···
 #include <linux/input.h>
 #include <linux/gameport.h>
 #include <linux/jiffies.h>
-#include <asm/timex.h>
+#include <linux/timex.h>
 
 #define DRIVER_DESC	"Analog joystick and gamepad driver"
 

drivers/input/misc/pcspkr.c

···
 #include <linux/init.h>
 #include <linux/input.h>
 #include <linux/platform_device.h>
+#include <linux/timex.h>
 #include <asm/io.h>
 
 MODULE_AUTHOR("Vojtech Pavlik <[e-mail]>");

include/linux/timex.h

···
 
 int read_current_timer(unsigned long *timer_val);
 
+/* The clock frequency of the i8253/i8254 PIT */
+#define PIT_TICK_RATE 1193182ul
+
 #endif /* KERNEL */
 
 #endif /* LINUX_TIMEX_H */

sound/drivers/pcsp/pcsp.h

···
 #define __PCSP_H__
 
 #include <linux/hrtimer.h>
+#include <linux/timex.h>
 #if defined(CONFIG_MIPS) || defined(CONFIG_X86)
 /* Use the global PIT lock ! */
 #include <asm/i8253.h>

sound/oss/pas2_pcm.c

···
 
 #include <linux/init.h>
 #include <linux/spinlock.h>
-#include <asm/timex.h>
+#include <linux/timex.h>
 #include "sound_config.h"
 
 #include "pas2.h"