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authorHaavard Skinnemoen <hskinnemoen@atmel.com>2007-08-13 16:34:33 +0200
committerHaavard Skinnemoen <hskinnemoen@atmel.com>2007-08-13 16:34:33 +0200
commit375c2c9e57ea5b8d678475379378f4774aa9cb88 (patch)
treec8499eaec089c8fe7c9eda562131f45b4a7738c6 /cpu/arm926ejs/davinci/timer.c
parentf0d1246ed7cb5a88522244c596d7ae7e6f161283 (diff)
parent9986bc3e40e899bea372a99a2bca4071bdf2e24b (diff)
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Merge commit 'upstream/master'
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diff --git a/cpu/arm926ejs/davinci/timer.c b/cpu/arm926ejs/davinci/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>
+ *
+ * Copyright (C) 2007 Sergey Kubushyn <ksi@koi8.net>
+ *
+ * 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 <arm926ejs.h>
+
+typedef volatile struct {
+ u_int32_t pid12;
+ u_int32_t emumgt_clksped;
+ u_int32_t gpint_en;
+ u_int32_t gpdir_dat;
+ u_int32_t tim12;
+ u_int32_t tim34;
+ u_int32_t prd12;
+ u_int32_t prd34;
+ u_int32_t tcr;
+ u_int32_t tgcr;
+ u_int32_t wdtcr;
+ u_int32_t tlgc;
+ u_int32_t tlmr;
+} davinci_timer;
+
+davinci_timer *timer = (davinci_timer *)CFG_TIMERBASE;
+
+#define TIMER_LOAD_VAL (CFG_HZ_CLOCK / CFG_HZ)
+#define READ_TIMER timer->tim34
+
+static ulong timestamp;
+static ulong lastinc;
+
+int timer_init(void)
+{
+ /* We are using timer34 in unchained 32-bit mode, full speed */
+ timer->tcr = 0x0;
+ timer->tgcr = 0x0;
+ timer->tgcr = 0x06;
+ timer->tim34 = 0x0;
+ timer->prd34 = TIMER_LOAD_VAL;
+ lastinc = 0;
+ timer->tcr = 0x80 << 16;
+ timestamp = 0;
+
+ return(0);
+}
+
+void reset_timer(void)
+{
+ reset_timer_masked();
+}
+
+ulong get_timer(ulong base)
+{
+ return(get_timer_masked() - base);
+}
+
+void set_timer(ulong t)
+{
+ timestamp = t;
+}
+
+void udelay(unsigned long usec)
+{
+ udelay_masked(usec);
+}
+
+void reset_timer_masked(void)
+{
+ lastinc = READ_TIMER;
+ timestamp = 0;
+}
+
+ulong get_timer_raw(void)
+{
+ ulong now = READ_TIMER;
+
+ if (now >= lastinc) {
+ /* normal mode */
+ timestamp += now - lastinc;
+ } else {
+ /* overflow ... */
+ timestamp += now + TIMER_LOAD_VAL - lastinc;
+ }
+ lastinc = now;
+ return timestamp;
+}
+
+ulong get_timer_masked(void)
+{
+ return(get_timer_raw() / TIMER_LOAD_VAL);
+}
+
+void udelay_masked(unsigned long usec)
+{
+ ulong tmo;
+ ulong endtime;
+ signed long diff;
+
+ tmo = CFG_HZ_CLOCK / 1000;
+ tmo *= usec;
+ tmo /= 1000;
+
+ endtime = get_timer_raw() + tmo;
+
+ do {
+ ulong now = get_timer_raw();
+ diff = endtime - now;
+ } while (diff >= 0);
+}
+
+/*
+ * 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 = CFG_HZ;
+ return(tbclk);
+}