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authorWolfgang Denk <wd@denx.de>2007-12-27 01:12:56 +0100
committerWolfgang Denk <wd@denx.de>2007-12-27 01:12:56 +0100
commit81b38be8631a0b809c97ab3d929f491373d7314f (patch)
tree0dd6444e2b602dcd06524f57c234b1f3b18ceb83 /cpu/sh4/time.c
parentf77ac3d657e9b1d40012153e872a2118cca10a3d (diff)
parent29592ecba3b932b9b152bcec6c0c0806412db4a3 (diff)
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Merge branch 'master' of git://www.denx.de/git/u-boot-sh
Conflicts: MAINTAINERS Signed-off-by: Wolfgang Denk <wd@denx.de>
Diffstat (limited to 'cpu/sh4/time.c')
-rw-r--r--cpu/sh4/time.c98
1 files changed, 98 insertions, 0 deletions
diff --git a/cpu/sh4/time.c b/cpu/sh4/time.c
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+/*
+ * (C) Copyright 2007
+ * Nobobuhiro Iwamatsu <iwamatsu@nigauri.org>
+ *
+ * (C) Copyright 2003
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * 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/processor.h>
+
+#define TMU_MAX_COUNTER (~0UL)
+
+static void tmu_timer_start (unsigned int timer)
+{
+ if (timer > 2)
+ return;
+
+ *((volatile unsigned char *) TSTR) |= (1 << timer);
+}
+
+static void tmu_timer_stop (unsigned int timer)
+{
+ u8 val = *((volatile u8 *)TSTR);
+ if (timer > 2)
+ return;
+ *((volatile unsigned char *)TSTR) = val &~(1 << timer);
+}
+
+int timer_init (void)
+{
+ /* Divide clock by 4 */
+ *(volatile u16 *)TCR0 = 0;
+
+ tmu_timer_stop(0);
+ tmu_timer_start(0);
+ return 0;
+}
+
+/*
+ In theory we should return a true 64bit value (ie something that doesn't
+ overflow). However, we don't. Therefore if TMU runs at fastest rate of
+ 6.75 MHz this value will wrap after u-boot has been running for approx
+ 10 minutes.
+*/
+unsigned long long get_ticks (void)
+{
+ return (0 - *((volatile u32 *) TCNT0));
+}
+
+unsigned long get_timer (unsigned long base)
+{
+ return ((0 - *((volatile u32 *) TCNT0)) - base);
+}
+
+void set_timer (unsigned long t)
+{
+ *((volatile unsigned int *) TCNT0) = (0 - t);
+}
+
+void reset_timer (void)
+{
+ tmu_timer_stop(0);
+ set_timer (0);
+ tmu_timer_start(0);
+}
+
+void udelay (unsigned long usec)
+{
+ unsigned int start = get_timer (0);
+ unsigned int end = start + (usec * ((CFG_HZ + 500000) / 1000000));
+
+ while (get_timer (0) < end)
+ continue;
+}
+
+unsigned long get_tbclk (void)
+{
+ return CFG_HZ;
+}