cpu/x86: Move calibrate_tsc_with_pit() to drivers/pc80

Change-Id: Ia8d8dc23ee0b51d62c83f5ba640b3a9aea4e744b
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/36507
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Marshall Dawson <marshalldawson3rd@gmail.com>

1 files changed, 1 insertions, 77 deletions

diff --git a/src/cpu/x86/tsc/delay_tsc.c b/src/cpu/x86/tsc/delay_tsc.c
index 0784822b30..afcd1d1f7d 100644
--- a/src/cpu/x86/tsc/delay_tsc.c
+++ b/src/cpu/x86/tsc/delay_tsc.c
@@ -12,90 +12,14 @@
  */
 
 #include <arch/early_variables.h>
-#include <console/console.h>
-#include <arch/io.h>
 #include <cpu/x86/tsc.h>
+#include <pc80/i8254.h>
 #include <smp/spinlock.h>
 #include <delay.h>
 #include <thread.h>
 
 static unsigned long clocks_per_usec CAR_GLOBAL;
 
-#define CLOCK_TICK_RATE	1193180U /* Underlying HZ */
-
-/* ------ Calibrate the TSC -------
- * Too much 64-bit arithmetic here to do this cleanly in C, and for
- * accuracy's sake we want to keep the overhead on the CTC speaker (channel 2)
- * output busy loop as low as possible. We avoid reading the CTC registers
- * directly because of the awkward 8-bit access mechanism of the 82C54
- * device.
- */
-
-#define CALIBRATE_INTERVAL ((2*CLOCK_TICK_RATE)/1000) /* 2ms */
-#define CALIBRATE_DIVISOR  (2*1000) /* 2ms / 2000 == 1usec */
-
-static unsigned long calibrate_tsc_with_pit(void)
-{
-	/* Set the Gate high, disable speaker */
-	outb((inb(0x61) & ~0x02) | 0x01, 0x61);
-
-	/*
-	 * Now let's take care of CTC channel 2
-	 *
-	 * Set the Gate high, program CTC channel 2 for mode 0,
-	 * (interrupt on terminal count mode), binary count,
-	 * load 5 * LATCH count, (LSB and MSB) to begin countdown.
-	 */
-	outb(0xb0, 0x43);	/* binary, mode 0, LSB/MSB, Ch 2 */
-
-	outb(CALIBRATE_INTERVAL	& 0xff, 0x42);	/* LSB of count */
-	outb(CALIBRATE_INTERVAL	>> 8, 0x42);	/* MSB of count */
-
-	{
-		tsc_t start;
-		tsc_t end;
-		unsigned long count;
-
-		start = rdtsc();
-		count = 0;
-		do {
-			count++;
-		} while ((inb(0x61) & 0x20) == 0);
-		end = rdtsc();
-
-		/* Error: ECTCNEVERSET */
-		if (count <= 1)
-			goto bad_ctc;
-
-		/* 64-bit subtract - gcc just messes up with long longs */
-		__asm__("subl %2,%0\n\t"
-			"sbbl %3,%1"
-			: "=a" (end.lo), "=d" (end.hi)
-			: "g" (start.lo), "g" (start.hi),
-			 "0" (end.lo), "1" (end.hi));
-
-		/* Error: ECPUTOOFAST */
-		if (end.hi)
-			goto bad_ctc;
-
-
-		/* Error: ECPUTOOSLOW */
-		if (end.lo <= CALIBRATE_DIVISOR)
-			goto bad_ctc;
-
-		return DIV_ROUND_UP(end.lo, CALIBRATE_DIVISOR);
-	}
-
-	/*
-	 * The CTC wasn't reliable: we got a hit on the very first read,
-	 * or the CPU was so fast/slow that the quotient wouldn't fit in
-	 * 32 bits..
-	 */
-bad_ctc:
-	printk(BIOS_ERR, "bad_ctc\n");
-	return 0;
-}
-
 static unsigned long calibrate_tsc(void)
 {
 	if (CONFIG(TSC_CONSTANT_RATE))