[MIPS] Rewrite all the assembler interrupt handlers to C.

Saves like 1,600 lines of code, is way easier to debug, compilers
frequently do a better job than the cut and paste type of handlers many
boards had.  And finally having all the stuff done in a single place
also means alot of bug potencial for the MT ASE is gone.

The only surviving handler in assembler is the DECstation one; I hope
Maciej will rewrite it.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

3 files changed, 26 insertions, 121 deletions

diff --git a/arch/mips/vr41xx/common/Makefile b/arch/mips/vr41xx/common/Makefile
index 9096302a7ec..aa373974c80 100644
--- a/arch/mips/vr41xx/common/Makefile
+++ b/arch/mips/vr41xx/common/Makefile
@@ -2,7 +2,7 @@
 # Makefile for common code of the NEC VR4100 series.
 #
 
-obj-y				+= bcu.o cmu.o icu.o init.o int-handler.o irq.o pmu.o type.o
+obj-y				+= bcu.o cmu.o icu.o init.o irq.o pmu.o type.o
 obj-$(CONFIG_VRC4173)		+= vrc4173.o
 
 EXTRA_AFLAGS := $(CFLAGS)
diff --git a/arch/mips/vr41xx/common/int-handler.S b/arch/mips/vr41xx/common/int-handler.S
deleted file mode 100644
index e8652348fef..00000000000
--- a/arch/mips/vr41xx/common/int-handler.S
+++ /dev/null
@@ -1,116 +0,0 @@
-/*
- * FILE NAME
- *	arch/mips/vr41xx/common/int-handler.S
- *
- * BRIEF MODULE DESCRIPTION
- *	Interrupt dispatcher for the NEC VR4100 series.
- *
- * Author: Yoichi Yuasa
- *         yyuasa@mvista.com or source@mvista.com
- *
- * Copyright 2001 MontaVista Software Inc.
- *
- *  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.
- */
-/*
- * Changes:
- *  MontaVista Software Inc. <yyuasa@mvista.com> or <source@mvista.com>
- *  - New creation, NEC VR4100 series are supported.
- *
- *  Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
- *  - Coped with INTASSIGN of NEC VR4133.
- */
-#include <asm/asm.h>
-#include <asm/regdef.h>
-#include <asm/mipsregs.h>
-#include <asm/stackframe.h>
-
-		.text
-		.set	noreorder
-
-		.align	5
-		NESTED(vr41xx_handle_interrupt, PT_SIZE, ra)
-		.set	noat
-		SAVE_ALL
-		CLI
-		.set	at
-		.set	noreorder
-
-		/*
-		 * Get the pending interrupts
-		 */
-		mfc0	t0, CP0_CAUSE
-		mfc0	t1, CP0_STATUS
-		andi	t0, 0xff00
-		and	t0, t0, t1
-
-		andi	t1, t0, CAUSEF_IP7	# MIPS timer interrupt
-		bnez	t1, handle_irq
-		li	a0, 7
-
-		andi	t1, t0, 0x7800		# check for Int1-4
-		beqz	t1, 1f
-
-		andi	t1, t0, CAUSEF_IP3	# check for Int1
-		bnez	t1, handle_int
-		li	a0, 3
-
-		andi	t1, t0, CAUSEF_IP4	# check for Int2
-		bnez	t1, handle_int
-		li	a0, 4
-
-		andi	t1, t0, CAUSEF_IP5	# check for Int3
-		bnez	t1, handle_int
-		li	a0, 5
-
-		andi	t1, t0, CAUSEF_IP6	# check for Int4
-		bnez	t1, handle_int
-		li	a0, 6
-
-1:
-		andi	t1, t0, CAUSEF_IP2	# check for Int0
-		bnez	t1, handle_int
-		li	a0, 2
-
-		andi	t1, t0, CAUSEF_IP0	# check for IP0
-		bnez	t1, handle_irq
-		li	a0, 0
-
-		andi	t1, t0, CAUSEF_IP1	# check for IP1
-		bnez	t1, handle_irq
-		li	a0, 1
-
-		jal	spurious_interrupt
-		nop
-		j	ret_from_irq
-		 nop
-
-handle_int:
-		jal	irq_dispatch
-		move	a1, sp
-		j	ret_from_irq
-		nop
-
-handle_irq:
-		jal	do_IRQ
-		move	a1, sp
-		j	ret_from_irq
-		END(vr41xx_handle_interrupt)
diff --git a/arch/mips/vr41xx/common/irq.c b/arch/mips/vr41xx/common/irq.c
index 61aa264275f..86796bb63c3 100644
--- a/arch/mips/vr41xx/common/irq.c
+++ b/arch/mips/vr41xx/common/irq.c
@@ -59,7 +59,7 @@ int cascade_irq(unsigned int irq, int (*get_irq)(unsigned int, struct pt_regs *)
 
 EXPORT_SYMBOL_GPL(cascade_irq);
 
-asmlinkage void irq_dispatch(unsigned int irq, struct pt_regs *regs)
+static void irq_dispatch(unsigned int irq, struct pt_regs *regs)
 {
 	irq_cascade_t *cascade;
 	irq_desc_t *desc;
@@ -84,11 +84,32 @@ asmlinkage void irq_dispatch(unsigned int irq, struct pt_regs *regs)
 		do_IRQ(irq, regs);
 }
 
-extern asmlinkage void vr41xx_handle_interrupt(void);
+asmlinkage void plat_irq_dispatch(struct pt_regs *regs)
+{
+	unsigned int pending = read_c0_cause() & read_c0_status() & ST0_IM;
+
+	if (pending & CAUSEF_IP7)
+		do_IRQ(7, regs);
+	else if (pending & 0x7800) {
+		if (pending & CAUSEF_IP3)
+			irq_dispatch(3, regs);
+		else if (pending & CAUSEF_IP4)
+			irq_dispatch(4, regs);
+		else if (pending & CAUSEF_IP5)
+			irq_dispatch(5, regs);
+		else if (pending & CAUSEF_IP6)
+			irq_dispatch(6, regs);
+	} else if (pending & CAUSEF_IP2)
+		irq_dispatch(2, regs);
+	else if (pending & CAUSEF_IP0)
+		do_IRQ(0, regs);
+	else if (pending & CAUSEF_IP1)
+		do_IRQ(1, regs);
+	else
+		spurious_interrupt(regs);
+}
 
 void __init arch_init_irq(void)
 {
 	mips_cpu_irq_init(MIPS_CPU_IRQ_BASE);
-
-	set_except_vector(0, vr41xx_handle_interrupt);
 }