patch-2.4.20 linux-2.4.20/arch/mips/mips-boards/sead/sead_int.c

• Lines: 117
• Date: Thu Nov 28 15:53:10 2002
• Orig file: linux-2.4.19/arch/mips/mips-boards/sead/sead_int.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -urN linux-2.4.19/arch/mips/mips-boards/sead/sead_int.c linux-2.4.20/arch/mips/mips-boards/sead/sead_int.c
@@ -0,0 +1,116 @@
+/*
+ * Carsten Langgaard, carstenl@mips.com
+ * Copyright (C) 2002 MIPS Technologies, Inc.  All rights reserved.
+ *
+ * ########################################################################
+ *
+ *  This program is free software; you can distribute it and/or modify it
+ *  under the terms of the GNU General Public License (Version 2) as
+ *  published by the Free Software Foundation.
+ *
+ *  This program is distributed in the hope 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.
+ *
+ * ########################################################################
+ *
+ * Routines for generic manipulation of the interrupts found on the MIPS
+ * Sead board.
+ *
+ */
+#include <linux/config.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/kernel_stat.h>
+
+#include <asm/irq.h>
+#include <asm/mips-boards/sead.h>
+#include <asm/mips-boards/seadint.h>
+
+extern asmlinkage void mipsIRQ(void);
+extern void do_IRQ(int irq, struct pt_regs *regs);
+
+void disable_sead_irq(unsigned int irq_nr)
+{
+	if (irq_nr == SEADINT_UART0)
+		clear_cp0_status(0x00000400);
+	else
+		if (irq_nr == SEADINT_UART1)
+			clear_cp0_status(0x00000800);
+}
+
+void enable_sead_irq(unsigned int irq_nr)
+{
+	if (irq_nr == SEADINT_UART0)
+		set_cp0_status(0x00000400);
+	else
+		if (irq_nr == SEADINT_UART1)
+			set_cp0_status(0x00000800);
+}
+
+static unsigned int startup_sead_irq(unsigned int irq)
+{
+	enable_sead_irq(irq);
+	return 0; /* never anything pending */
+}
+
+#define shutdown_sead_irq	disable_sead_irq
+
+#define mask_and_ack_sead_irq disable_sead_irq
+
+static void end_sead_irq(unsigned int irq)
+{
+	if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
+		enable_sead_irq(irq);
+}
+
+static struct hw_interrupt_type sead_irq_type = {
+	"SEAD",
+	startup_sead_irq,
+	shutdown_sead_irq,
+	enable_sead_irq,
+	disable_sead_irq,
+	mask_and_ack_sead_irq,
+	end_sead_irq,
+	NULL
+};
+
+void sead_hw0_irqdispatch(struct pt_regs *regs)
+{
+	do_IRQ(0, regs);
+}
+
+void sead_hw1_irqdispatch(struct pt_regs *regs)
+{
+	do_IRQ(1, regs);
+}
+
+void __init init_IRQ(void)
+{
+	int i;
+
+        /*
+         * Mask out all interrupt
+	 */
+	clear_cp0_status(0x0000ff00);
+
+	/* Now safe to set the exception vector. */
+	set_except_vector(0, mipsIRQ);
+
+	init_generic_irq();
+
+	for (i = 0; i <= SEADINT_END; i++) {
+		irq_desc[i].status	= IRQ_DISABLED;
+		irq_desc[i].action	= NULL;
+		irq_desc[i].depth	= 1;
+		irq_desc[i].lock	= SPIN_LOCK_UNLOCKED;
+		irq_desc[i].handler	= &sead_irq_type;
+	}
+}