[PATCH] Time: i386 Conversion - part 4: Remove Old timer_opts Code

Remove the old timers/timer_opts infrastructure which has been disabled.  It
is a fairly straightforward set of deletions

Note that this does not provide any i386 clocksources, so you will only have
the jiffies clocksource.  To get full replacements for the code being removed
here, the timeofday-clocks-i386 patch will be needed.

Signed-off-by: John Stultz <johnstul@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 0 insertions, 164 deletions

diff --git a/arch/i386/kernel/timers/timer_pit.c b/arch/i386/kernel/timers/timer_pit.c
deleted file mode 100644
index 44cbdf9bda9df..0000000000000
--- a/arch/i386/kernel/timers/timer_pit.c
+++ /dev/null
@@ -1,164 +0,0 @@
-/*
- * This code largely moved from arch/i386/kernel/time.c.
- * See comments there for proper credits.
- */
-
-#include <linux/spinlock.h>
-#include <linux/module.h>
-#include <linux/device.h>
-#include <linux/sysdev.h>
-#include <linux/timex.h>
-#include <asm/delay.h>
-#include <asm/mpspec.h>
-#include <asm/timer.h>
-#include <asm/smp.h>
-#include <asm/io.h>
-#include <asm/arch_hooks.h>
-#include <asm/i8253.h>
-
-#include "do_timer.h"
-#include "io_ports.h"
-
-static int count_p; /* counter in get_offset_pit() */
-
-static int __init init_pit(char* override)
-{
- 	/* check clock override */
- 	if (override[0] && strncmp(override,"pit",3))
- 		printk(KERN_ERR "Warning: clock= override failed. Defaulting "
-				"to PIT\n");
- 	init_cpu_khz();
-	count_p = LATCH;
-	return 0;
-}
-
-static void mark_offset_pit(void)
-{
-	/* nothing needed */
-}
-
-static unsigned long long monotonic_clock_pit(void)
-{
-	return 0;
-}
-
-static void delay_pit(unsigned long loops)
-{
-	int d0;
-	__asm__ __volatile__(
-		"\tjmp 1f\n"
-		".align 16\n"
-		"1:\tjmp 2f\n"
-		".align 16\n"
-		"2:\tdecl %0\n\tjns 2b"
-		:"=&a" (d0)
-		:"0" (loops));
-}
-
-
-/* This function must be called with xtime_lock held.
- * It was inspired by Steve McCanne's microtime-i386 for BSD.  -- jrs
- * 
- * However, the pc-audio speaker driver changes the divisor so that
- * it gets interrupted rather more often - it loads 64 into the
- * counter rather than 11932! This has an adverse impact on
- * do_gettimeoffset() -- it stops working! What is also not
- * good is that the interval that our timer function gets called
- * is no longer 10.0002 ms, but 9.9767 ms. To get around this
- * would require using a different timing source. Maybe someone
- * could use the RTC - I know that this can interrupt at frequencies
- * ranging from 8192Hz to 2Hz. If I had the energy, I'd somehow fix
- * it so that at startup, the timer code in sched.c would select
- * using either the RTC or the 8253 timer. The decision would be
- * based on whether there was any other device around that needed
- * to trample on the 8253. I'd set up the RTC to interrupt at 1024 Hz,
- * and then do some jiggery to have a version of do_timer that 
- * advanced the clock by 1/1024 s. Every time that reached over 1/100
- * of a second, then do all the old code. If the time was kept correct
- * then do_gettimeoffset could just return 0 - there is no low order
- * divider that can be accessed.
- *
- * Ideally, you would be able to use the RTC for the speaker driver,
- * but it appears that the speaker driver really needs interrupt more
- * often than every 120 us or so.
- *
- * Anyway, this needs more thought....		pjsg (1993-08-28)
- * 
- * If you are really that interested, you should be reading
- * comp.protocols.time.ntp!
- */
-
-static unsigned long get_offset_pit(void)
-{
-	int count;
-	unsigned long flags;
-	static unsigned long jiffies_p = 0;
-
-	/*
-	 * cache volatile jiffies temporarily; we have xtime_lock. 
-	 */
-	unsigned long jiffies_t;
-
-	spin_lock_irqsave(&i8253_lock, flags);
-	/* timer count may underflow right here */
-	outb_p(0x00, PIT_MODE);	/* latch the count ASAP */
-
-	count = inb_p(PIT_CH0);	/* read the latched count */
-
-	/*
-	 * We do this guaranteed double memory access instead of a _p 
-	 * postfix in the previous port access. Wheee, hackady hack
-	 */
- 	jiffies_t = jiffies;
-
-	count |= inb_p(PIT_CH0) << 8;
-	
-        /* VIA686a test code... reset the latch if count > max + 1 */
-        if (count > LATCH) {
-                outb_p(0x34, PIT_MODE);
-                outb_p(LATCH & 0xff, PIT_CH0);
-                outb(LATCH >> 8, PIT_CH0);
-                count = LATCH - 1;
-        }
-	
-	/*
-	 * avoiding timer inconsistencies (they are rare, but they happen)...
-	 * there are two kinds of problems that must be avoided here:
-	 *  1. the timer counter underflows
-	 *  2. hardware problem with the timer, not giving us continuous time,
-	 *     the counter does small "jumps" upwards on some Pentium systems,
-	 *     (see c't 95/10 page 335 for Neptun bug.)
-	 */
-
-	if( jiffies_t == jiffies_p ) {
-		if( count > count_p ) {
-			/* the nutcase */
-			count = do_timer_overflow(count);
-		}
-	} else
-		jiffies_p = jiffies_t;
-
-	count_p = count;
-
-	spin_unlock_irqrestore(&i8253_lock, flags);
-
-	count = ((LATCH-1) - count) * TICK_SIZE;
-	count = (count + LATCH/2) / LATCH;
-
-	return count;
-}
-
-
-/* tsc timer_opts struct */
-struct timer_opts timer_pit = {
-	.name = "pit",
-	.mark_offset = mark_offset_pit, 
-	.get_offset = get_offset_pit,
-	.monotonic_clock = monotonic_clock_pit,
-	.delay = delay_pit,
-};
-
-struct init_timer_opts __initdata timer_pit_init = {
-	.init = init_pit, 
-	.opts = &timer_pit,
-};