arm: timer and interrupt init rework

actually the timer init use the interrupt_init as init callback
which make the interrupt and timer implementation difficult to follow

so now rename it as int timer_init(void) and use interrupt_init for interrupt

btw also remane the corresponding file to the functionnality implemented

as ixp arch implement two timer - one based on interrupt - so all the timer
related code is moved to timer.c

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>

1 files changed, 128 insertions, 0 deletions

diff --git a/cpu/pxa/timer.c b/cpu/pxa/timer.c
new file mode 100644
index 0000000..e2df3a5
--- /dev/null
+++ b/cpu/pxa/timer.c
@@ -0,0 +1,128 @@
+/*
+ * (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>
+ *
+ * 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/pxa-regs.h>
+#include <div64.h>
+
+#ifdef CONFIG_USE_IRQ
+#error: interrupts not implemented yet
+#endif
+
+#if defined(CONFIG_PXA27X) || defined(CONFIG_CPU_MONAHANS)
+#define TIMER_FREQ_HZ 3250000
+#elif defined(CONFIG_PXA250)
+#define TIMER_FREQ_HZ 3686400
+#else
+#error "Timer frequency unknown - please config PXA CPU type"
+#endif
+
+static inline unsigned long long tick_to_time(unsigned long long tick)
+{
+	tick *= CONFIG_SYS_HZ;
+	do_div(tick, TIMER_FREQ_HZ);
+	return tick;
+}
+
+static inline unsigned long long us_to_tick(unsigned long long us)
+{
+	us = us * TIMER_FREQ_HZ + 999999;
+	do_div(us, 1000000);
+	return us;
+}
+
+int timer_init (void)
+{
+	reset_timer();
+
+	return 0;
+}
+
+void reset_timer (void)
+{
+	reset_timer_masked ();
+}
+
+ulong get_timer (ulong base)
+{
+	return get_timer_masked () - base;
+}
+
+void set_timer (ulong t)
+{
+	/* nop */
+}
+
+void udelay (unsigned long usec)
+{
+	udelay_masked (usec);
+}
+
+
+void reset_timer_masked (void)
+{
+	OSCR = 0;
+}
+
+ulong get_timer_masked (void)
+{
+	return tick_to_time(get_ticks());
+}
+
+void udelay_masked (unsigned long usec)
+{
+	unsigned long long tmp;
+	ulong tmo;
+
+	tmo = us_to_tick(usec);
+	tmp = get_ticks() + tmo;	/* get current timestamp */
+
+	while (get_ticks() < tmp)	/* loop till event */
+		 /*NOP*/;
+
+}
+
+/*
+ * 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 OSCR;
+}
+
+/*
+ * 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 = TIMER_FREQ_HZ;
+	return tbclk;
+}