1 files changed, 149 insertions, 0 deletions
diff --git a/cpu/arm926ejs/at91sam9/timer.c b/cpu/arm926ejs/at91sam9/timer.c
new file mode 100644
index 0000000..4e79466
--- /dev/null
+++ b/cpu/arm926ejs/at91sam9/timer.c
@@ -0,0 +1,149 @@
+/*
+ * (C) Copyright 2007-2008
+ * Stelian Pop <stelian.pop <at> leadtechdesign.com>
+ * Lead Tech Design <www.leadtechdesign.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/arch/hardware.h>
+#include <asm/arch/at91_pit.h>
+#include <asm/arch/at91_pmc.h>
+#include <asm/arch/at91_rstc.h>
+#include <asm/arch/io.h>
+
+/*
+ * We're using the AT91CAP9/SAM9 PITC in 32 bit mode, by
+ * setting the 20 bit counter period to its maximum (0xfffff).
+ */
+#define TIMER_LOAD_VAL	0xfffff
+#define READ_RESET_TIMER at91_sys_read(AT91_PIT_PIVR)
+#define READ_TIMER at91_sys_read(AT91_PIT_PIIR)
+#define TIMER_FREQ (AT91C_MASTER_CLOCK << 4)
+#define TICKS_TO_USEC(ticks) ((ticks) / 6)
+
+ulong get_timer_masked(void);
+ulong resettime;
+
+/* nothing really to do with interrupts, just starts up a counter. */
+int timer_init(void)
+{
+	/*
+	 * Enable PITC Clock
+	 * The clock is already enabled for system controller in boot
+	 */
+	at91_sys_write(AT91_PMC_PCER, 1 << AT91_ID_SYS);
+
+	/* Enable PITC */
+	at91_sys_write(AT91_PIT_MR, TIMER_LOAD_VAL | AT91_PIT_PITEN);
+
+	reset_timer_masked();
+
+	return 0;
+}
+
+/*
+ * timer without interrupts
+ */
+
+static inline ulong get_timer_raw(void)
+{
+	ulong now = READ_TIMER;
+
+	if (now >= resettime)
+		return now - resettime;
+	else
+		return 0xFFFFFFFFUL - (resettime - now) ;
+}
+
+void reset_timer_masked(void)
+{
+	resettime = READ_TIMER;
+}
+
+ulong get_timer_masked(void)
+{
+	return TICKS_TO_USEC(get_timer_raw());
+
+}
+
+void udelay_masked(unsigned long usec)
+{
+	ulong tmp;
+
+	tmp = get_timer(0);
+	while (get_timer(tmp) < usec)	/* our timer works in usecs */
+		; /* NOP */
+}
+
+void reset_timer(void)
+{
+	reset_timer_masked();
+}
+
+ulong get_timer(ulong base)
+{
+	ulong now = get_timer_masked();
+
+	if (now >= base)
+		return now - base;
+	else
+		return TICKS_TO_USEC(0xFFFFFFFFUL) - (base - now) ;
+}
+
+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 = CFG_HZ;
+	return tbclk;
+}
+
+/*
+ * Reset the cpu by setting up the watchdog timer and let him time out.
+ */
+void reset_cpu(ulong ignored)
+{
+	/* this is the way Linux does it */
+	at91_sys_write(AT91_RSTC_CR, AT91_RSTC_KEY |
+				     AT91_RSTC_PROCRST |
+				     AT91_RSTC_PERRST);
+
+	while (1);
+	/* Never reached */
+}