Initial revision

1 files changed, 185 insertions, 0 deletions

diff --git a/cpu/mpc824x/interrupts.c b/cpu/mpc824x/interrupts.c
new file mode 100644
index 0000000..2011671
--- /dev/null
+++ b/cpu/mpc824x/interrupts.c
@@ -0,0 +1,185 @@
+/*
+ * (C) Copyright 2000-2002
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ * Rob Taylor, Flying Pig Systems. robt@flyingpig.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 <mpc824x.h>
+#include <asm/processor.h>
+#include <asm/pci_io.h>
+#include <commproc.h>
+#include "drivers/epic.h"
+
+/****************************************************************************/
+
+unsigned decrementer_count;		/* count val for 1e6/HZ microseconds */
+
+static __inline__ unsigned long get_msr (void)
+{
+	unsigned long msr;
+
+	asm volatile ("mfmsr %0":"=r" (msr):);
+
+	return msr;
+}
+
+static __inline__ void set_msr (unsigned long msr)
+{
+	asm volatile ("mtmsr %0"::"r" (msr));
+}
+
+static __inline__ unsigned long get_dec (void)
+{
+	unsigned long val;
+
+	asm volatile ("mfdec %0":"=r" (val):);
+
+	return val;
+}
+
+
+static __inline__ void set_dec (unsigned long val)
+{
+	asm volatile ("mtdec %0"::"r" (val));
+}
+
+
+void enable_interrupts (void)
+{
+	set_msr (get_msr () | MSR_EE);
+}
+
+/* returns flag if MSR_EE was set before */
+int disable_interrupts (void)
+{
+	ulong msr = get_msr ();
+
+	set_msr (msr & ~MSR_EE);
+	return ((msr & MSR_EE) != 0);
+}
+
+/****************************************************************************/
+
+int interrupt_init (void)
+{
+	decrementer_count = (get_bus_freq (0) / 4) / CFG_HZ;
+
+        /*
+         * It's all broken at the moment and I currently don't need
+         * interrupts. If you want to fix it, have a look at the epic
+         * drivers in dink32 v12. They do everthing and Motorola said
+         * I could use the dink source in this project as long as
+         * copyright notices remain intact.
+	 */
+
+	epicInit (EPIC_DIRECT_IRQ, 0);
+
+	set_dec (decrementer_count);
+
+	set_msr (get_msr () | MSR_EE);
+
+	return (0);
+}
+
+/****************************************************************************/
+
+/*
+ * Handle external interrupts
+ */
+void external_interrupt (struct pt_regs *regs)
+{
+	register unsigned long temp;
+
+	pci_readl (CFG_EUMB_ADDR + EPIC_PROC_INT_ACK_REG, temp);
+	sync ();					/* i'm not convinced this is needed, but dink source has it */
+	temp &= 0xff;				/*get vector */
+
+	/*TODO: handle them -... */
+	epicEOI ();
+}
+
+/****************************************************************************/
+
+/*
+ * blank int handlers.
+ */
+
+void
+irq_install_handler (int vec, interrupt_handler_t * handler, void *arg)
+{
+}
+
+void irq_free_handler (int vec)
+{
+
+}
+
+/*TODO: some handlers for winbond and 87308 interrupts
+ and what about generic pci inteerupts?
+ vga?
+ */
+
+volatile ulong timestamp = 0;
+
+void timer_interrupt (struct pt_regs *regs)
+{
+	/* Restore Decrementer Count */
+	set_dec (decrementer_count);
+
+	timestamp++;
+
+#if defined(CONFIG_WATCHDOG)
+	if ((timestamp % (CFG_HZ / 2)) == 0) {
+#if defined(CONFIG_OXC)
+		{
+			extern void oxc_wdt_reset (void);
+
+			oxc_wdt_reset ();
+		}
+#endif
+	}
+#endif							/* CONFIG_WATCHDOG */
+#if defined(CONFIG_SHOW_ACTIVITY) && defined(CONFIG_OXC)
+	if ((timestamp % (CFG_HZ / 10)) == 0) {
+		{
+			extern void oxc_toggle_activeled (void);
+
+			oxc_toggle_activeled ();
+		}
+	}
+#endif
+}
+
+void reset_timer (void)
+{
+	timestamp = 0;
+}
+
+ulong get_timer (ulong base)
+{
+	return (timestamp - base);
+}
+
+void set_timer (ulong t)
+{
+	timestamp = t;
+}