patch-2.4.22 linux-2.4.22/arch/mips/gt64120/ev64120/irq.c

• Lines: 146
• Date: 2003-08-25 04:44:40.000000000 -0700
• Orig file: linux-2.4.21/arch/mips/gt64120/ev64120/irq.c
• Orig date: 1969-12-31 16:00:00.000000000 -0800

diff -urN linux-2.4.21/arch/mips/gt64120/ev64120/irq.c linux-2.4.22/arch/mips/gt64120/ev64120/irq.c
@@ -0,0 +1,145 @@
+/*
+ * BRIEF MODULE DESCRIPTION
+ * Code to handle irqs on GT64120A boards
+ *  Derived from mips/orion and Cort <cort@fsmlabs.com>
+ *
+ * Copyright (C) 2000 RidgeRun, Inc.
+ * Author: RidgeRun, Inc.
+ *   glonnon@ridgerun.com, skranz@ridgerun.com, stevej@ridgerun.com
+ *
+ *  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/mipsregs.h>
+#include <asm/system.h>
+#include <asm/gt64120/gt64120.h>
+
+asmlinkage inline void pci_intA(struct pt_regs *regs)
+{
+	do_IRQ(GT_INTA, regs);
+}
+
+asmlinkage inline void pci_intD(struct pt_regs *regs)
+{
+	do_IRQ(GT_INTD, regs);
+}
+
+static void disable_ev64120_irq(unsigned int irq_nr)
+{
+	unsigned long flags;
+
+	local_irq_save(flags);
+	if (irq_nr >= 8) {	// All PCI interrupts are on line 5 or 2
+		clear_c0_status(9 << 10);
+	} else {
+		clear_c0_status(1 << (irq_nr + 8));
+	}
+	local_irq_restore(flags);
+}
+
+static void enable_ev64120_irq(unsigned int irq_nr)
+{
+	unsigned long flags;
+
+	local_irq_save(flags);
+	if (irq_nr >= 8)	// All PCI interrupts are on line 5 or 2
+		set_c0_status(9 << 10);
+	else
+		set_c0_status(1 << (irq_nr + 8));
+	local_irq_restore(flags);
+}
+
+static unsigned int startup_ev64120_irq(unsigned int irq)
+{
+	enable_ev64120_irq(irq);
+	return 0;		/* Never anything pending  */
+}
+
+#define shutdown_ev64120_irq     disable_ev64120_irq
+#define mask_and_ack_ev64120_irq disable_ev64120_irq
+
+static void end_ev64120_irq(unsigned int irq)
+{
+	if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
+		enable_ev64120_irq(irq);
+}
+
+static struct hw_interrupt_type ev64120_irq_type = {
+	.typename	= "EV64120",
+	.startup	= startup_ev64120_irq,
+	.shutdown	= shutdown_ev64120_irq,
+	.enable		= enable_ev64120_irq,
+	.disable	= disable_ev64120_irq,
+	.ack		= mask_and_ack_ev64120_irq,
+	.end		= end_ev64120_irq,
+	.set_affinity	= NULL
+};
+
+void gt64120_irq_setup(void)
+{
+	extern asmlinkage void galileo_handle_int(void);
+
+	/*
+	 * Clear all of the interrupts while we change the able around a bit.
+	 */
+	clear_c0_status(ST0_IM);
+
+	/* Sets the exception_handler array. */
+	set_except_vector(0, galileo_handle_int);
+
+	cli();
+
+	/*
+	 * Enable timer.  Other interrupts will be enabled as they are
+	 * registered.
+	 */
+	set_c0_status(IE_IRQ2);
+}
+
+void __init init_IRQ(void)
+{
+	int i;
+
+	/*  Let's initialize our IRQ descriptors  */
+	for (i = 0; i < NR_IRQS; i++) {
+		irq_desc[i].status = 0;
+		irq_desc[i].handler = &no_irq_type;
+		irq_desc[i].action = NULL;
+		irq_desc[i].depth = 0;
+		irq_desc[i].lock = SPIN_LOCK_UNLOCKED;
+	}
+
+	gt64120_irq_setup();
+}