[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)