[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, 217 deletions

diff --git a/arch/i386/kernel/timers/timer_hpet.c b/arch/i386/kernel/timers/timer_hpet.c
deleted file mode 100644
index 17a6fe7166e7b..0000000000000
--- a/arch/i386/kernel/timers/timer_hpet.c
+++ /dev/null
@@ -1,217 +0,0 @@
-/*
- * This code largely moved from arch/i386/kernel/time.c.
- * See comments there for proper credits.
- */
-
-#include <linux/spinlock.h>
-#include <linux/init.h>
-#include <linux/timex.h>
-#include <linux/errno.h>
-#include <linux/string.h>
-#include <linux/jiffies.h>
-
-#include <asm/timer.h>
-#include <asm/io.h>
-#include <asm/processor.h>
-
-#include "io_ports.h"
-#include "mach_timer.h"
-#include <asm/hpet.h>
-
-static unsigned long hpet_usec_quotient __read_mostly;	/* convert hpet clks to usec */
-static unsigned long tsc_hpet_quotient __read_mostly;	/* convert tsc to hpet clks */
-static unsigned long hpet_last; 	/* hpet counter value at last tick*/
-static unsigned long last_tsc_low;	/* lsb 32 bits of Time Stamp Counter */
-static unsigned long last_tsc_high; 	/* msb 32 bits of Time Stamp Counter */
-static unsigned long long monotonic_base;
-static seqlock_t monotonic_lock = SEQLOCK_UNLOCKED;
-
-/* convert from cycles(64bits) => nanoseconds (64bits)
- *  basic equation:
- *		ns = cycles / (freq / ns_per_sec)
- *		ns = cycles * (ns_per_sec / freq)
- *		ns = cycles * (10^9 / (cpu_khz * 10^3))
- *		ns = cycles * (10^6 / cpu_khz)
- *
- *	Then we use scaling math (suggested by george@mvista.com) to get:
- *		ns = cycles * (10^6 * SC / cpu_khz) / SC
- *		ns = cycles * cyc2ns_scale / SC
- *
- *	And since SC is a constant power of two, we can convert the div
- *  into a shift.
- *
- *  We can use khz divisor instead of mhz to keep a better percision, since
- *  cyc2ns_scale is limited to 10^6 * 2^10, which fits in 32 bits.
- *  (mathieu.desnoyers@polymtl.ca)
- *
- *			-johnstul@us.ibm.com "math is hard, lets go shopping!"
- */
-static unsigned long cyc2ns_scale __read_mostly;
-#define CYC2NS_SCALE_FACTOR 10 /* 2^10, carefully chosen */
-
-static inline void set_cyc2ns_scale(unsigned long cpu_khz)
-{
-	cyc2ns_scale = (1000000 << CYC2NS_SCALE_FACTOR)/cpu_khz;
-}
-
-static inline unsigned long long cycles_2_ns(unsigned long long cyc)
-{
-	return (cyc * cyc2ns_scale) >> CYC2NS_SCALE_FACTOR;
-}
-
-static unsigned long long monotonic_clock_hpet(void)
-{
-	unsigned long long last_offset, this_offset, base;
-	unsigned seq;
-
-	/* atomically read monotonic base & last_offset */
-	do {
-		seq = read_seqbegin(&monotonic_lock);
-		last_offset = ((unsigned long long)last_tsc_high<<32)|last_tsc_low;
-		base = monotonic_base;
-	} while (read_seqretry(&monotonic_lock, seq));
-
-	/* Read the Time Stamp Counter */
-	rdtscll(this_offset);
-
-	/* return the value in ns */
-	return base + cycles_2_ns(this_offset - last_offset);
-}
-
-static unsigned long get_offset_hpet(void)
-{
-	register unsigned long eax, edx;
-
-	eax = hpet_readl(HPET_COUNTER);
-	eax -= hpet_last;	/* hpet delta */
-	eax = min(hpet_tick, eax);
-	/*
-         * Time offset = (hpet delta) * ( usecs per HPET clock )
-	 *             = (hpet delta) * ( usecs per tick / HPET clocks per tick)
-	 *             = (hpet delta) * ( hpet_usec_quotient ) / (2^32)
-	 *
-	 * Where,
-	 * hpet_usec_quotient = (2^32 * usecs per tick)/HPET clocks per tick
-	 *
-	 * Using a mull instead of a divl saves some cycles in critical path.
-         */
-	ASM_MUL64_REG(eax, edx, hpet_usec_quotient, eax);
-
-	/* our adjusted time offset in microseconds */
-	return edx;
-}
-
-static void mark_offset_hpet(void)
-{
-	unsigned long long this_offset, last_offset;
-	unsigned long offset;
-
-	write_seqlock(&monotonic_lock);
-	last_offset = ((unsigned long long)last_tsc_high<<32)|last_tsc_low;
-	rdtsc(last_tsc_low, last_tsc_high);
-
-	if (hpet_use_timer)
-		offset = hpet_readl(HPET_T0_CMP) - hpet_tick;
-	else
-		offset = hpet_readl(HPET_COUNTER);
-	if (unlikely(((offset - hpet_last) >= (2*hpet_tick)) && (hpet_last != 0))) {
-		int lost_ticks = ((offset - hpet_last) / hpet_tick) - 1;
-		jiffies_64 += lost_ticks;
-	}
-	hpet_last = offset;
-
-	/* update the monotonic base value */
-	this_offset = ((unsigned long long)last_tsc_high<<32)|last_tsc_low;
-	monotonic_base += cycles_2_ns(this_offset - last_offset);
-	write_sequnlock(&monotonic_lock);
-}
-
-static void delay_hpet(unsigned long loops)
-{
-	unsigned long hpet_start, hpet_end;
-	unsigned long eax;
-
-	/* loops is the number of cpu cycles. Convert it to hpet clocks */
-	ASM_MUL64_REG(eax, loops, tsc_hpet_quotient, loops);
-
-	hpet_start = hpet_readl(HPET_COUNTER);
-	do {
-		rep_nop();
-		hpet_end = hpet_readl(HPET_COUNTER);
-	} while ((hpet_end - hpet_start) < (loops));
-}
-
-static struct timer_opts timer_hpet;
-
-static int __init init_hpet(char* override)
-{
-	unsigned long result, remain;
-
-	/* check clock override */
-	if (override[0] && strncmp(override,"hpet",4))
-		return -ENODEV;
-
-	if (!is_hpet_enabled())
-		return -ENODEV;
-
-	printk("Using HPET for gettimeofday\n");
-	if (cpu_has_tsc) {
-		unsigned long tsc_quotient = calibrate_tsc_hpet(&tsc_hpet_quotient);
-		if (tsc_quotient) {
-			/* report CPU clock rate in Hz.
-			 * The formula is (10^6 * 2^32) / (2^32 * 1 / (clocks/us)) =
-			 * clock/second. Our precision is about 100 ppm.
-			 */
-			{	unsigned long eax=0, edx=1000;
-				ASM_DIV64_REG(cpu_khz, edx, tsc_quotient,
-						eax, edx);
-				printk("Detected %u.%03u MHz processor.\n",
-					cpu_khz / 1000, cpu_khz % 1000);
-			}
-			set_cyc2ns_scale(cpu_khz);
-		}
-		/* set this only when cpu_has_tsc */
-		timer_hpet.read_timer = read_timer_tsc;
-	}
-
-	/*
-	 * Math to calculate hpet to usec multiplier
-	 * Look for the comments at get_offset_hpet()
-	 */
-	ASM_DIV64_REG(result, remain, hpet_tick, 0, KERNEL_TICK_USEC);
-	if (remain > (hpet_tick >> 1))
-		result++; /* rounding the result */
-	hpet_usec_quotient = result;
-
-	return 0;
-}
-
-static int hpet_resume(void)
-{
-	write_seqlock(&monotonic_lock);
-	/* Assume this is the last mark offset time */
-	rdtsc(last_tsc_low, last_tsc_high);
-
-	if (hpet_use_timer)
-		hpet_last = hpet_readl(HPET_T0_CMP) - hpet_tick;
-	else
-		hpet_last = hpet_readl(HPET_COUNTER);
-	write_sequnlock(&monotonic_lock);
-	return 0;
-}
-/************************************************************/
-
-/* tsc timer_opts struct */
-static struct timer_opts timer_hpet __read_mostly = {
-	.name = 		"hpet",
-	.mark_offset =		mark_offset_hpet,
-	.get_offset =		get_offset_hpet,
-	.monotonic_clock =	monotonic_clock_hpet,
-	.delay = 		delay_hpet,
-	.resume	=		hpet_resume,
-};
-
-struct init_timer_opts __initdata timer_hpet_init = {
-	.init =	init_hpet,
-	.opts = &timer_hpet,
-};