patch-2.4.19 linux-2.4.19/arch/mips/galileo-boards/ev96100/irq.c

• Lines: 136
• Date: Fri Aug 2 17:39:43 2002
• Orig file: linux-2.4.18/arch/mips/galileo-boards/ev96100/irq.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -urN linux-2.4.18/arch/mips/galileo-boards/ev96100/irq.c linux-2.4.19/arch/mips/galileo-boards/ev96100/irq.c
@@ -0,0 +1,135 @@
+/*
+ * Copyright 2000 MontaVista Software Inc.
+ * Author: MontaVista Software, Inc.
+ *         	ppopov@mvista.com or source@mvista.com
+ *
+ * This file was derived from Carsten Langgaard's 
+ * arch/mips/mips-boards/atlas/atlas_int.c.
+ *
+ * Carsten Langgaard, carstenl@mips.com
+ * Copyright (C) 1999,2000 MIPS Technologies, Inc.  All rights reserved.
+ *
+ *  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  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
+ *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
+ *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
+ *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
+ *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
+ *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
+ *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ *  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.,
+ *  675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/kernel_stat.h>
+#include <linux/module.h>
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/types.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/timex.h>
+#include <linux/slab.h>
+#include <linux/random.h>
+
+#include <asm/bitops.h>
+#include <asm/bootinfo.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/mipsregs.h>
+#include <asm/system.h>
+#include <asm/galileo-boards/ev96100int.h>
+
+extern asmlinkage unsigned int do_IRQ(int irq, struct pt_regs *regs);
+
+extern void mips_timer_interrupt(int irq, struct pt_regs *regs);
+extern asmlinkage void ev96100IRQ(void);
+
+static void disable_ev96100_irq(unsigned int irq_nr)
+{
+	unsigned long flags;
+
+	save_and_cli(flags);
+	clear_cp0_status(0x100 << irq_nr);
+	restore_flags(flags);
+}
+
+static inline void enable_ev96100_irq(unsigned int irq_nr)
+{
+	unsigned long flags;
+
+	save_and_cli(flags);
+	set_cp0_status(0x100 << irq_nr);
+	restore_flags(flags);
+}
+
+static unsigned int startup_ev96100_irq(unsigned int irq)
+{
+	enable_ev96100_irq(irq);
+
+	return 0;	/* never anything pending */
+}
+
+#define shutdown_ev96100_irq		disable_ev96100_irq
+#define mask_and_ack_ev96100_irq	disable_ev96100_irq
+
+static void end_ev96100_irq (unsigned int irq)
+{
+	if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
+		enable_ev96100_irq(irq);
+}
+
+static inline unsigned int ffz8(unsigned int word)
+{
+	unsigned long k;
+
+	k = 7;
+	if (word & 0x0fUL) { k -= 4;  word <<= 4;  }
+	if (word & 0x30UL) { k -= 2;  word <<= 2;  }
+	if (word & 0x40UL) { k -= 1; }
+
+	return k;
+}
+
+asmlinkage void ev96100_cpu_irq(unsigned long cause, struct pt_regs * regs)
+{
+	if (!(cause & 0xff00))
+		return;
+
+	do_IRQ(ffz8((cause >> 8) & 0xff), regs);
+}
+
+static struct hw_interrupt_type ev96100_irq_type = {
+	"EV96100",
+	startup_ev96100_irq,
+	shutdown_ev96100_irq,
+	enable_ev96100_irq,
+	disable_ev96100_irq,
+	mask_and_ack_ev96100_irq,
+	end_ev96100_irq
+};
+
+void __init init_IRQ(void)
+{
+	int i;
+
+	set_except_vector(0, ev96100IRQ);
+	init_generic_irq();
+
+	for (i = 0; i < 8; i++) {
+		irq_desc[i].status	= IRQ_DISABLED;
+		irq_desc[i].action	= 0;
+		irq_desc[i].depth	= 1;
+		irq_desc[i].handler	= &ev96100_irq_type;
+	}
+}