1 files changed, 183 insertions, 0 deletions
diff --git a/cpu/arm926ejs/nomadik/timer.c b/cpu/arm926ejs/nomadik/timer.c
new file mode 100644
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+++ b/cpu/arm926ejs/nomadik/timer.c
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+/*
+ * (C) Copyright 2003
+ * Texas Instruments <www.ti.com>
+ *
+ * (C) Copyright 2002
+ * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
+ * Marius Groeger <mgroeger@sysgo.de>
+ *
+ * (C) Copyright 2002
+ * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
+ * Alex Zuepke <azu@sysgo.de>
+ *
+ * (C) Copyright 2002-2004
+ * Gary Jennejohn, DENX Software Engineering, <gj@denx.de>
+ *
+ * (C) Copyright 2004
+ * Philippe Robin, ARM Ltd. <philippe.robin@arm.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
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <arm926ejs.h>
+
+#define TIMER_LOAD_VAL 0xffffffff
+
+/* macro to read the 32 bit timer */
+#define READ_TIMER readl(CONFIG_SYS_TIMERBASE + 20)
+
+static ulong timestamp;
+static ulong lastdec;
+
+/* nothing really to do with interrupts, just starts up a counter. */
+int timer_init(void)
+{
+	/* Load timer with initial value */
+	writel(TIMER_LOAD_VAL, CONFIG_SYS_TIMERBASE + 16);
+
+	/*
+	 * Set timer to be enabled, free-running, no interrupts, 256 divider,
+	 * 32-bit, wrap-mode
+	 */
+	writel(0x8a, CONFIG_SYS_TIMERBASE + 24);
+
+	/* init the timestamp and lastdec value */
+	reset_timer_masked();
+
+	return 0;
+}
+
+/*
+ * timer without interrupts
+ */
+void reset_timer(void)
+{
+	reset_timer_masked();
+}
+
+ulong get_timer(ulong base)
+{
+	return get_timer_masked() - base;
+}
+
+void set_timer(ulong t)
+{
+	timestamp = t;
+}
+
+/* delay x useconds AND perserve advance timstamp value */
+void udelay(unsigned long usec)
+{
+	ulong tmo, tmp;
+
+	if (usec >= 1000) {
+		/* if "big" number, spread normalization to seconds */
+		tmo = usec / 1000;	/* start to normalize */
+		tmo *= CONFIG_SYS_HZ;	/* find number of "ticks" */
+		tmo /= 1000;		/* finish normalize. */
+	} else {
+		/* small number, don't kill it prior to HZ multiply */
+		tmo = usec * CONFIG_SYS_HZ;
+		tmo /= (1000 * 1000);
+	}
+
+	tmp = get_timer(0);		/* get current timestamp */
+	if ((tmo + tmp + 1) < tmp)	/* will roll time stamp? */
+		reset_timer_masked();	/* reset to 0, set lastdec value */
+	else
+		tmo += tmp;
+
+	while (get_timer_masked() < tmo)
+		/* nothing */ ;
+}
+
+void reset_timer_masked(void)
+{
+	/* reset time */
+	lastdec = READ_TIMER;	/* capure current decrementer value time */
+	timestamp = 0;		/* start "advancing" time stamp from 0 */
+}
+
+ulong get_timer_masked(void)
+{
+	ulong now = READ_TIMER;		/* current tick value */
+
+	if (lastdec >= now) {		/* normal mode (non roll) */
+		/* move stamp fordward */
+		timestamp += lastdec - now;
+	} else {
+		/*
+		 * An overflow is expected.
+		 * nts = ts + ld + (TLV - now)
+		 * ts=old stamp, ld=time that passed before passing through -1
+		 * (TLV-now) amount of time after passing though -1
+		 * nts = new "advancing time stamp"...it could also roll
+		 */
+		timestamp += lastdec + TIMER_LOAD_VAL - now;
+	}
+	lastdec = now;
+
+	return timestamp;
+}
+
+/* waits specified delay value and resets timestamp */
+void udelay_masked(unsigned long usec)
+{
+	ulong tmo;
+
+	if (usec >= 1000) {
+		/* if "big" number, spread normalization to seconds */
+		tmo = usec / 1000;	/* start to normalize */
+		tmo *= CONFIG_SYS_HZ;	/* find number of "ticks" */
+		tmo /= 1000;		/* finish normalize. */
+	} else {
+		/* else small number, don't kill it prior to HZ multiply */
+		tmo = usec * CONFIG_SYS_HZ;
+		tmo /= (1000*1000);
+	}
+
+	reset_timer_masked();
+	/* set "advancing" timestamp to 0, set lastdec vaule */
+
+	while (get_timer_masked() < tmo)
+		/* nothing */ ;
+}
+
+/*
+ * 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 get_timer(0);
+}
+
+/*
+ * 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 tbclk;
+
+	tbclk = CONFIG_SYS_HZ;
+	return tbclk;
+}