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Subject[x86-64 patch 8/11] Joystick timing for x86-64
Hi!

This patch adds support for timing on x86-64 in the joystick drivers. It
also changes the compile-time configuration of TSC vs PIT timing to
runtime - PIT is too slow to notice the extra check and TSC processors
are fast enough to make it non-noticeable (and TSC precision is much
much more than we need anyway in the joystick drivers).

diff -urN linux-x86_64/drivers/char/joystick/analog.c linux-64-latest/drivers/char/joystick/analog.c
--- linux-x86_64/drivers/char/joystick/analog.c Thu Sep 13 15:17:33 2001
+++ linux-64-latest/drivers/char/joystick/analog.c Thu Sep 13 16:55:10 2001
@@ -39,6 +39,7 @@
#include <linux/init.h>
#include <linux/input.h>
#include <linux/gameport.h>
+#include <asm/timex.h>

MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
MODULE_DESCRIPTION("Analog joystick and gamepad driver for Linux");
@@ -135,27 +136,25 @@
*/

#ifdef __i386__
-#ifdef CONFIG_X86_TSC
-#define GET_TIME(x) __asm__ __volatile__ ( "rdtsc" : "=a" (x) : : "dx" )
+#define TSC_PRESENT (test_bit(X86_FEATURE_TSC, &boot_cpu_data.x86_capability))
+#define GET_TIME(x) do { if (TSC_PRESENT) rdtscl(x); else outb(0, 0x43); x = inb(0x40); x |= inb(0x40) << 8; } while (0)
+#define DELTA(x,y) (TSC_PRESENT?((y)-(x)):((x)-(y)+((x)<(y)?1193180L/HZ:0)))
+#define TIME_NAME (TSC_PRESENT?"TSC":"PIT")
+#elif __x86_64__
+#define GET_TIME(x) rdtscl(x)
#define DELTA(x,y) ((y)-(x))
-#define TIME_NAME "TSC"
-#else
-#define GET_TIME(x) do { outb(0, 0x43); x = inb(0x40); x |= inb(0x40) << 8; } while (0)
-#define DELTA(x,y) ((x)-(y)+((x)<(y)?1193180L/HZ:0))
-#define TIME_NAME "PIT"
-#endif
+#define TIME_NAME "TSC"
#elif __alpha__
-#define GET_TIME(x) __asm__ __volatile__ ( "rpcc %0" : "=r" (x) )
+#define GET_TIME(x) get_cycles(x)
#define DELTA(x,y) ((y)-(x))
-#define TIME_NAME "PCC"
-#endif
-
-#ifndef GET_TIME
+#define TIME_NAME "PCC"
+#else
#define FAKE_TIME
static unsigned long analog_faketime = 0;
#define GET_TIME(x) do { x = analog_faketime++; } while(0)
#define DELTA(x,y) ((y)-(x))
-#define TIME_NAME "Unreliable"
+#define TIME_NAME "Unreliable"
+#warning Precise timer not defined for this architecture.
#endif

/*
@@ -497,7 +496,7 @@
if (port->cooked)
printk(" [ADC port]\n");
else
- printk(" ["TIME_NAME" timer, %d %sHz clock, %d ns res]\n",
+ printk(" [%s timer, %d %sHz clock, %d ns res]\n", TIME_NAME,
port->speed > 10000 ? (port->speed + 800) / 1000 : port->speed,
port->speed > 10000 ? "M" : "k", (port->loop * 1000000) / port->speed);
}
diff -urN linux-x86_64/drivers/char/joystick/gameport.c linux-64-latest/drivers/char/joystick/gameport.c
--- linux-x86_64/drivers/char/joystick/gameport.c Thu Sep 13 15:17:33 2001
+++ linux-64-latest/drivers/char/joystick/gameport.c Thu Sep 13 15:54:50 2001
@@ -61,7 +61,7 @@

static int gameport_measure_speed(struct gameport *gameport)
{
-#ifdef __i386__
+#if defined(__i386__) || defined(__x86_64__)

#define GET_TIME(x) do { outb(0, 0x43); x = inb(0x40); x |= inb(0x40) << 8; } while (0)
#define DELTA(x,y) ((y)-(x)+((y)<(x)?1193180L/HZ:0))
--
Vojtech Pavlik
SuSE Labs
-
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