summaryrefslogtreecommitdiff
path: root/cpu/arm920t/imx/timer.c
diff options
context:
space:
mode:
authorWolfgang Denk <wd@denx.de>2009-06-14 22:05:42 +0200
committerWolfgang Denk <wd@denx.de>2009-06-14 22:05:42 +0200
commit92afd368bba7d98b2b7bfb51082c3639bb2119b3 (patch)
tree74ffc8a3f4980f7c6bad6bf80bb41d3974eff685 /cpu/arm920t/imx/timer.c
parent6b1f78ae6ad037382ad430b07064105c88f7ac02 (diff)
parent388517e4b745b00256c2fa201ce7bccb67b4f245 (diff)
downloadu-boot-imx-92afd368bba7d98b2b7bfb51082c3639bb2119b3.zip
u-boot-imx-92afd368bba7d98b2b7bfb51082c3639bb2119b3.tar.gz
u-boot-imx-92afd368bba7d98b2b7bfb51082c3639bb2119b3.tar.bz2
Merge branch 'next' of ../master
Diffstat (limited to 'cpu/arm920t/imx/timer.c')
-rw-r--r--cpu/arm920t/imx/timer.c138
1 files changed, 138 insertions, 0 deletions
diff --git a/cpu/arm920t/imx/timer.c b/cpu/arm920t/imx/timer.c
new file mode 100644
index 0000000..31ec588
--- /dev/null
+++ b/cpu/arm920t/imx/timer.c
@@ -0,0 +1,138 @@
+/*
+ * (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
+ * Gary Jennejohn, DENX Software Engineering, <garyj@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>
+#if defined (CONFIG_IMX)
+
+#include <asm/arch/imx-regs.h>
+
+int timer_init (void)
+{
+ int i;
+ /* setup GP Timer 1 */
+ TCTL1 = TCTL_SWR;
+ for ( i=0; i<100; i++) TCTL1 = 0; /* We have no udelay by now */
+ TPRER1 = get_PERCLK1() / 1000000; /* 1 MHz */
+ TCTL1 |= TCTL_FRR | (1<<1); /* Freerun Mode, PERCLK1 input */
+
+ 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)
+{
+ /* nop */
+}
+
+void reset_timer_masked (void)
+{
+ TCTL1 &= ~TCTL_TEN;
+ TCTL1 |= TCTL_TEN; /* Enable timer */
+}
+
+ulong get_timer_masked (void)
+{
+ return TCN1;
+}
+
+void udelay_masked (unsigned long usec)
+{
+ ulong endtime = get_timer_masked() + usec;
+ signed long diff;
+
+ do {
+ ulong now = get_timer_masked ();
+ diff = endtime - now;
+ } while (diff >= 0);
+}
+
+void udelay (unsigned long usec)
+{
+ udelay_masked(usec);
+}
+
+/*
+ * 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;
+}
+
+/*
+ * Reset the cpu by setting up the watchdog timer and let him time out
+ */
+void reset_cpu (ulong ignored)
+{
+ /* Disable watchdog and set Time-Out field to 0 */
+ WCR = 0x00000000;
+
+ /* Write Service Sequence */
+ WSR = 0x00005555;
+ WSR = 0x0000AAAA;
+
+ /* Enable watchdog */
+ WCR = 0x00000001;
+
+ while (1);
+ /*NOTREACHED*/
+}
+
+#endif /* defined (CONFIG_IMX) */