Merge branch 'denx-coldfire' into coldfire-aug2007

1 files changed, 117 insertions, 0 deletions

diff --git a/lib_m68k/interrupts.c b/lib_m68k/interrupts.c
new file mode 100644
index 0000000..8919c0e
--- /dev/null
+++ b/lib_m68k/interrupts.c
@@ -0,0 +1,117 @@
+/*
+ * (C) Copyright 2000-2004
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * (C) Copyright 2007 Freescale Semiconductor Inc
+ * TsiChung Liew (Tsi-Chung.Liew@freescale.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 <watchdog.h>
+#include <asm/processor.h>
+#include <asm/immap.h>
+
+#define	NR_IRQS		(CFG_NUM_IRQS)
+
+/*
+ * Interrupt vector functions.
+ */
+struct interrupt_action {
+	interrupt_handler_t *handler;
+	void *arg;
+};
+
+static struct interrupt_action irq_vecs[NR_IRQS];
+
+static __inline__ unsigned short get_sr (void)
+{
+	unsigned short sr;
+
+	asm volatile ("move.w %%sr,%0":"=r" (sr):);
+
+	return sr;
+}
+
+static __inline__ void set_sr (unsigned short sr)
+{
+	asm volatile ("move.w %0,%%sr"::"r" (sr));
+}
+
+/************************************************************************/
+/*
+ * Install and free an interrupt handler
+ */
+void irq_install_handler (int vec, interrupt_handler_t * handler, void *arg)
+{
+	if ((vec < 0) || (vec > NR_IRQS)) {
+		printf ("irq_install_handler: wrong interrupt vector %d\n",
+			vec);
+		return;
+	}
+
+	irq_vecs[vec].handler = handler;
+	irq_vecs[vec].arg = arg;
+}
+
+void irq_free_handler (int vec)
+{
+	if ((vec < 0) || (vec > NR_IRQS)) {
+		return;
+	}
+
+	irq_vecs[vec].handler = NULL;
+	irq_vecs[vec].arg = NULL;
+}
+
+void enable_interrupts (void)
+{
+	unsigned short sr;
+
+	sr = get_sr ();
+	set_sr (sr & ~0x0700);
+}
+
+int disable_interrupts (void)
+{
+	unsigned short sr;
+
+	sr = get_sr ();
+	set_sr (sr | 0x0700);
+
+	return ((sr & 0x0700) == 0);	/* return TRUE, if interrupts were enabled before */
+}
+
+void int_handler (struct pt_regs *fp)
+{
+	int vec;
+
+	vec = (fp->vector >> 2) & 0xff;
+	if (vec > 0x40)
+		vec -= 0x40;
+	else
+		return;
+
+	if (irq_vecs[vec].handler != NULL) {
+		irq_vecs[vec].handler (irq_vecs[vec].arg);
+	} else {
+		printf ("\nBogus External Interrupt Vector %d\n", vec);
+	}
+}