SPARC: Added generic support for SPARC architecture.

Signed-off-by: Daniel Hellstrom <daniel@gaisler.com>

1 files changed, 122 insertions, 0 deletions

diff --git a/lib_sparc/interrupts.c b/lib_sparc/interrupts.c
new file mode 100644
index 0000000..4c73b82
--- /dev/null
+++ b/lib_sparc/interrupts.c
@@ -0,0 +1,122 @@
+/*
+ * (C) Copyright 2000-2002
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * (C) Copyright 2003
+ * Gleb Natapov <gnatapov@mrv.com>
+ *
+ * (C) Copyright 2007
+ * Daniel Hellstrom, Gaisler Research, daniel@gaisler.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/processor.h>
+#include <asm/irq.h>
+
+/* Implemented by SPARC CPUs */
+extern int interrupt_init_cpu(void);
+extern void timer_interrupt_cpu(void *arg);
+extern int timer_interrupt_init_cpu(void);
+
+int intLock(void)
+{
+	unsigned int pil;
+
+	pil = get_pil();
+
+	/* set PIL to 15 ==> no pending interrupts will interrupt CPU */
+	set_pil(15);
+
+	return pil;
+}
+
+void intUnlock(int oldLevel)
+{
+	set_pil(oldLevel);
+}
+
+void enable_interrupts(void)
+{
+	set_pil(0);		/* enable all interrupts */
+}
+
+int disable_interrupts(void)
+{
+	return intLock();
+}
+
+int interrupt_init(void)
+{
+	int ret;
+
+	/* call cpu specific function from $(CPU)/interrupts.c */
+	ret = interrupt_init_cpu();
+
+	/* enable global interrupts */
+	enable_interrupts();
+
+	return ret;
+}
+
+/* timer interrupt/overflow counter */
+static volatile ulong timestamp = 0;
+
+/* regs can not be used here! regs is actually the pointer given in
+ * irq_install_handler
+ */
+void timer_interrupt(struct pt_regs *regs)
+{
+	/* call cpu specific function from $(CPU)/interrupts.c */
+	timer_interrupt_cpu((void *)regs);
+
+	timestamp++;
+}
+
+void reset_timer(void)
+{
+	timestamp = 0;
+}
+
+ulong get_timer(ulong base)
+{
+	return (timestamp - base);
+}
+
+void set_timer(ulong t)
+{
+	timestamp = t;
+}
+
+void timer_interrupt_init(void)
+{
+	int irq;
+
+	reset_timer();
+
+	irq = timer_interrupt_init_cpu();
+
+	if (irq < 0) {
+		/* cpu specific code handled the interrupt registration it self */
+		return;
+	}
+	/* register interrupt handler for timer */
+	irq_install_handler(irq, (void (*)(void *))timer_interrupt, NULL);
+}