summaryrefslogtreecommitdiff
path: root/cpu/sh4/time.c
diff options
context:
space:
mode:
authorJon Loeliger <jdl@freescale.com>2008-01-03 09:46:55 -0600
committerJon Loeliger <jdl@freescale.com>2008-01-03 09:46:55 -0600
commit2c3536425d987bf079258973e2acebaaef3e16b6 (patch)
tree659d06dd33eca4888e1f6d01d046507b76dc2d27 /cpu/sh4/time.c
parentf743931f9b4d4e15c9bdfe726bef033ea1f1402c (diff)
parentce37422d0002e10490e268392e0c4e3028e52cec (diff)
downloadu-boot-imx-2c3536425d987bf079258973e2acebaaef3e16b6.zip
u-boot-imx-2c3536425d987bf079258973e2acebaaef3e16b6.tar.gz
u-boot-imx-2c3536425d987bf079258973e2acebaaef3e16b6.tar.bz2
Merge commit 'wd/master'
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
new file mode 100644
index 0000000..5f8a3a0
--- /dev/null
+++ b/cpu/sh4/time.c
@@ -0,0 +1,98 @@
+/*
+ * (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;
+}