X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=arch%2Fx86%2Flib%2Fpcat_timer.c;h=3545a5048e0c9f883263eed8a6a20bf1d9fc1b9a;hb=e94019ede750f2807b5a211ba39beb05bba5714d;hp=6b3db69447009d711b43e66dedbffbd2e77fd0c1;hpb=7708d8b352e9e595f6f08afd3206af6495c7dc09;p=oweals%2Fu-boot.git

diff --git a/arch/x86/lib/pcat_timer.c b/arch/x86/lib/pcat_timer.c
index 6b3db69447..3545a5048e 100644
--- a/arch/x86/lib/pcat_timer.c
+++ b/arch/x86/lib/pcat_timer.c
@@ -2,105 +2,26 @@
  * (C) Copyright 2002
  * Daniel Engström, Omicron Ceti AB, <daniel@omicron.se>
  *
- * See file CREDITS for list of people who contributed to this
- * project.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of
- * the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
- * MA 02111-1307 USA
+ * SPDX-License-Identifier:	GPL-2.0+
  */
 
 #include <common.h>
 #include <asm/io.h>
 #include <asm/i8254.h>
-#include <asm/ibmpc.h>
-#include <asm/interrupt.h>
 
-#define TIMER0_VALUE 0x04aa /* 1kHz 1.9318MHz / 1000 */
 #define TIMER2_VALUE 0x0a8e /* 440Hz */
 
-static int timer_init_done;
-
-int timer_init(void)
+int pcat_timer_init(void)
 {
-	/* initialize timer 0 and 2
-	 *
-	 * Timer 0 is used to increment system_tick 1000 times/sec
-	 * Timer 1 was used for DRAM refresh in early PC's
-	 * Timer 2 is used to drive the speaker
-	 * (to stasrt a beep: write 3 to port 0x61,
+	/*
+	 * initialize 2, used to drive the speaker
+	 * (to start a beep: write 3 to port 0x61,
 	 * to stop it again: write 0)
 	 */
-	outb(PIT_CMD_CTR0 | PIT_CMD_BOTH | PIT_CMD_MODE2,
-			PIT_BASE + PIT_COMMAND);
-	outb(TIMER0_VALUE & 0xff, PIT_BASE + PIT_T0);
-	outb(TIMER0_VALUE >> 8, PIT_BASE + PIT_T0);
-
 	outb(PIT_CMD_CTR2 | PIT_CMD_BOTH | PIT_CMD_MODE3,
 			PIT_BASE + PIT_COMMAND);
 	outb(TIMER2_VALUE & 0xff, PIT_BASE + PIT_T2);
 	outb(TIMER2_VALUE >> 8, PIT_BASE + PIT_T2);
 
-	irq_install_handler(0, timer_isr, NULL);
-	unmask_irq(0);
-
-	timer_init_done = 1;
-
 	return 0;
 }
-
-static u16 read_pit(void)
-{
-	u8 low;
-
-	outb(PIT_CMD_LATCH, PIT_BASE + PIT_COMMAND);
-	low = inb(PIT_BASE + PIT_T0);
-
-	return (inb(PIT_BASE + PIT_T0) << 8) | low;
-}
-
-/* this is not very exact */
-void __udelay(unsigned long usec)
-{
-	int counter;
-	int wraps;
-
-	if (timer_init_done) {
-		counter = read_pit();
-		wraps = usec / 1000;
-		usec = usec % 1000;
-
-		usec *= 1194;
-		usec /= 1000;
-		usec += counter;
-
-		while (usec > 1194) {
-			usec -= 1194;
-			wraps++;
-		}
-
-		while (1) {
-			int new_count = read_pit();
-
-			if (((new_count < usec) && !wraps) || wraps < 0)
-				break;
-
-			if (new_count > counter)
-				wraps--;
-
-			counter = new_count;
-		}
-	}
-
-}