[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, 9 insertions, 76 deletions

diff --git a/arch/mips/lasat/Makefile b/arch/mips/lasat/Makefile
index 0d5aec436725..99f5046fdf49 100644
--- a/arch/mips/lasat/Makefile
+++ b/arch/mips/lasat/Makefile
@@ -3,7 +3,7 @@
 #
 
 obj-y	 			+= reset.o setup.o prom.o lasat_board.o \
-				   at93c.o interrupt.o lasatIRQ.o
+				   at93c.o interrupt.o
 
 obj-$(CONFIG_LASAT_SYSCTL)	+= sysctl.o
 obj-$(CONFIG_DS1603)		+= ds1603.o
diff --git a/arch/mips/lasat/interrupt.c b/arch/mips/lasat/interrupt.c
index 852a41901a5e..2d3472b21ebb 100644
--- a/arch/mips/lasat/interrupt.c
+++ b/arch/mips/lasat/interrupt.c
@@ -27,14 +27,13 @@
 #include <asm/bootinfo.h>
 #include <asm/irq.h>
 #include <asm/lasat/lasatint.h>
+#include <asm/time.h>
 #include <asm/gdb-stub.h>
 
 static volatile int *lasat_int_status = NULL;
 static volatile int *lasat_int_mask = NULL;
 static volatile int lasat_int_mask_shift;
 
-extern asmlinkage void lasatIRQ(void);
-
 void disable_lasat_irq(unsigned int irq_nr)
 {
 	unsigned long flags;
@@ -109,11 +108,17 @@ static unsigned long get_int_status_200(void)
 	return int_status;
 }
 
-void lasat_hw0_irqdispatch(struct pt_regs *regs)
+asmlinkage void plat_irq_dispatch(struct pt_regs *regs)
 {
 	unsigned long int_status;
+	unsigned int cause = read_c0_cause();
 	int irq;
 
+	if (cause & CAUSEF_IP7) {	/* R4000 count / compare IRQ */
+		ll_timer_interrupt(7, regs);
+		return;
+	}
+
 	int_status = get_int_status();
 
 	/* if int_status == 0, then the interrupt has already been cleared */
@@ -147,9 +152,6 @@ void __init arch_init_irq(void)
 		panic("arch_init_irq: mips_machtype incorrect");
 	}
 
-	/* Now safe to set the exception vector. */
-	set_except_vector(0, lasatIRQ);
-
 	for (i = 0; i <= LASATINT_END; i++) {
 		irq_desc[i].status	= IRQ_DISABLED;
 		irq_desc[i].action	= 0;
diff --git a/arch/mips/lasat/lasatIRQ.S b/arch/mips/lasat/lasatIRQ.S
deleted file mode 100644
index 2a2b0d056561..000000000000
--- a/arch/mips/lasat/lasatIRQ.S
+++ /dev/null
@@ -1,69 +0,0 @@
-/*
- * Carsten Langgaard, carstenl@mips.com
- * Copyright (C) 1999, 2000 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.
- *
- * Interrupt exception dispatch code.
- */
-#include <asm/asm.h>
-#include <asm/mipsregs.h>
-#include <asm/regdef.h>
-#include <asm/stackframe.h>
-
-	.text
-	.set	noreorder
-	.align	5
-	NESTED(lasatIRQ, PT_SIZE, sp)
-	.set	noat
-	SAVE_ALL
-	CLI
-	.set	at
-	.set	noreorder
-
-	mfc0	s0, CP0_CAUSE		# get irq mask
-
-	/* First we check for r4k counter/timer IRQ. */
-	andi	a0, s0, CAUSEF_IP7
-	beq	a0, zero, 1f
-	 andi	a0, s0, CAUSEF_IP2	# delay slot, check hw0 interrupt
-
-	/* Wheee, a timer interrupt. */
-	li	a0, 7
-	jal	ll_timer_interrupt
-	 move	a1, sp
-
-	j	ret_from_irq
-	 nop
-
-1:
-	/* Wheee, combined hardware level zero interrupt. */
-	jal	lasat_hw0_irqdispatch
-	 move	a0, sp			# delay slot
-
-	j	ret_from_irq
-	 nop				# delay slot
-
-1:
-	/*
-	 * Here by mistake?  This is possible, what can happen is that by the
-	 * time we take the exception the IRQ pin goes low, so just leave if
-	 * this is the case.
-	 */
-	move	a1,s0
-	mfc0	a1, CP0_EPC
-
-	j	ret_from_irq
-	 nop
-	END(lasatIRQ)