X-Git-Url: http://review.tizen.org/git/?a=blobdiff_plain;f=arch%2Farm%2Fcpu%2Fpxa%2Ftimer.c;h=c4717de6a9c4ccdd3d551c1e5acd8016d93f840a;hb=7f673c99c2d8d1aa21996c5b914f06d784b080ca;hp=ec950c79660ebb1e0c9816a6d0e24a3c9ca3293b;hpb=3ba8bf7c6d6c09b9823b08b03d2d155907313238;p=platform%2Fkernel%2Fu-boot.git

diff --git a/arch/arm/cpu/pxa/timer.c b/arch/arm/cpu/pxa/timer.c
index ec950c7..c4717de 100644
--- a/arch/arm/cpu/pxa/timer.c
+++ b/arch/arm/cpu/pxa/timer.c
@@ -1,29 +1,9 @@
 /*
- * (C) Copyright 2002
- * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
- * Marius Groeger <mgroeger@sysgo.de>
+ * Marvell PXA2xx/3xx timer driver
  *
- * (C) Copyright 2002
- * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
- * Alex Zuepke <azu@sysgo.de>
+ * Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
  *
- * 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 <asm/arch/pxa-regs.h>
@@ -31,71 +11,63 @@
 #include <common.h>
 #include <div64.h>
 
-#ifdef CONFIG_USE_IRQ
-#error: interrupts not implemented yet
-#endif
+DECLARE_GLOBAL_DATA_PTR;
 
-#if defined(CONFIG_PXA27X) || defined(CONFIG_CPU_MONAHANS)
-#define TIMER_FREQ_HZ 3250000
-#elif defined(CONFIG_PXA250)
-#define TIMER_FREQ_HZ 3686400
+#define	TIMER_LOAD_VAL	0xffffffff
+
+#define	timestamp	(gd->arch.tbl)
+#define	lastinc		(gd->arch.lastinc)
+
+#if defined(CONFIG_CPU_PXA27X) || defined(CONFIG_CPU_MONAHANS)
+#define	TIMER_FREQ_HZ	3250000
+#elif defined(CONFIG_CPU_PXA25X)
+#define	TIMER_FREQ_HZ	3686400
 #else
 #error "Timer frequency unknown - please config PXA CPU type"
 #endif
 
-static inline unsigned long long tick_to_time(unsigned long long tick)
+static unsigned long long tick_to_time(unsigned long long tick)
 {
-	tick *= CONFIG_SYS_HZ;
-	do_div(tick, TIMER_FREQ_HZ);
-	return tick;
+	return lldiv(tick * CONFIG_SYS_HZ, TIMER_FREQ_HZ);
 }
 
-static inline unsigned long long us_to_tick(unsigned long long us)
+static unsigned long long us_to_tick(unsigned long long us)
 {
-	us = us * TIMER_FREQ_HZ + 999999;
-	do_div(us, 1000000);
-	return us;
+	return lldiv(us * TIMER_FREQ_HZ, 1000000);
 }
 
-int timer_init (void)
+int timer_init(void)
 {
-	reset_timer();
-
+	writel(0, OSCR);
 	return 0;
 }
 
-void reset_timer (void)
-{
-	reset_timer_masked ();
-}
-
-ulong get_timer (ulong base)
-{
-	return get_timer_masked () - base;
-}
-
-void set_timer (ulong t)
-{
-	/* nop */
-}
-
-void __udelay (unsigned long usec)
-{
-	udelay_masked (usec);
-}
-
-
-void reset_timer_masked (void)
+unsigned long long get_ticks(void)
 {
-	writel(0, OSCR);
+	/* Current tick value */
+	uint32_t now = readl(OSCR);
+
+	if (now >= lastinc) {
+		/*
+		 * Normal mode (non roll)
+		 * Move stamp forward with absolute diff ticks
+		 */
+		timestamp += (now - lastinc);
+	} else {
+		/* We have rollover of incrementer */
+		timestamp += (TIMER_LOAD_VAL - lastinc) + now;
+	}
+
+	lastinc = now;
+	return timestamp;
 }
 
-ulong get_timer_masked (void)
+ulong get_timer(ulong base)
 {
-	return tick_to_time(get_ticks());
+	return tick_to_time(get_ticks()) - base;
 }
 
-void udelay_masked (unsigned long usec)
+void __udelay(unsigned long usec)
 {
 	unsigned long long tmp;
 	ulong tmo;
@@ -105,25 +77,9 @@ void udelay_masked (unsigned long usec)
 
 	while (get_ticks() < tmp)	/* loop till event */
 		 /*NOP*/;
-
 }
 
-/*
- * This function is derived from PowerPC code (read timebase as long long).
- * On ARM it just returns the timer value.
- */
-unsigned long long get_ticks(void)
-{
-	return readl(OSCR);
-}
-
-/*
- * This function is derived from PowerPC code (timebase clock frequency).
- * On ARM it returns the number of timer ticks per second.
- */
-ulong get_tbclk (void)
+ulong get_tbclk(void)
 {
-	ulong tbclk;
-	tbclk = TIMER_FREQ_HZ;
-	return tbclk;
+	return TIMER_FREQ_HZ;
 }