[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, 16 insertions, 127 deletions

diff --git a/arch/mips/gt64120/ev64120/Makefile b/arch/mips/gt64120/ev64120/Makefile
index ebe91c57e173..b2c53a8f8718 100644
--- a/arch/mips/gt64120/ev64120/Makefile
+++ b/arch/mips/gt64120/ev64120/Makefile
@@ -6,6 +6,6 @@
 # Makefile for the Galileo EV64120 board.
 #
 
-obj-y   += int-handler.o irq.o promcon.o reset.o serialGT.o setup.o
+obj-y   += irq.o promcon.o reset.o serialGT.o setup.o
 
 EXTRA_AFLAGS := $(CFLAGS)
diff --git a/arch/mips/gt64120/ev64120/int-handler.S b/arch/mips/gt64120/ev64120/int-handler.S
deleted file mode 100644
index 9dda5b449522..000000000000
--- a/arch/mips/gt64120/ev64120/int-handler.S
+++ /dev/null
@@ -1,114 +0,0 @@
-/*
- * int-handler.S
- *
- * Based on the cobalt handler.
- */
-#include <asm/asm.h>
-#include <asm/mipsregs.h>
-#include <asm/addrspace.h>
-#include <asm/regdef.h>
-#include <asm/stackframe.h>
-
-/*
- * galileo_handle_int -
- *      We check for the timer first, then check PCI ints A and D.
- *      Then check for serial IRQ and fall through.
- */
-                .align  5
-                .set    reorder
-                .set    noat
-                NESTED(galileo_handle_int, PT_SIZE, sp)
-                SAVE_ALL
-                CLI
-                .set    at
-                mfc0    t0,CP0_CAUSE
-                mfc0    t2,CP0_STATUS
-
-                and     t0,t2
-
-                andi    t1,t0,STATUSF_IP4 /* int2 hardware line (timer) */
-                bnez    t1,ll_gt64120_irq
-                andi    t1,t0,STATUSF_IP2 /* int0 hardware line */
-                bnez    t1,ll_pci_intA
-                andi    t1,t0,STATUSF_IP5 /* int3 hardware line */
-                bnez    t1,ll_pci_intD
-                andi    t1,t0,STATUSF_IP6 /* int4 hardware line */
-                bnez    t1,ll_serial_irq
-                andi    t1,t0,STATUSF_IP7 /* compare int */
-                bnez    t1,ll_compare_irq
-                nop
-
-    /* wrong alarm or masked ... */
-                jal     spurious_interrupt
-                nop
-                j       ret_from_irq
-                END(galileo_handle_int)
-
-
-                .align  5
-                .set    reorder
-ll_gt64120_irq:
-                li      a0,4
-                move    a1,sp
-                jal     do_IRQ
-                nop
-                j       ret_from_irq
-                nop
-
-                .align  5
-                .set    reorder
-ll_compare_irq:
-                li      a0,7
-                move    a1,sp
-                jal     do_IRQ
-                nop
-                j       ret_from_irq
-                nop
-
-                .align  5
-                .set    reorder
-ll_pci_intA:
-                move    a0,sp
-                jal     pci_intA
-                nop
-                j       ret_from_irq
-                nop
-
-#if 0
-                .align  5
-                .set    reorder
-ll_pci_intB:
-                move    a0,sp
-                jal     pci_intB
-                nop
-                j       ret_from_irq
-                nop
-
-                .align  5
-                .set    reorder
-ll_pci_intC:
-                move    a0,sp
-                jal     pci_intC
-                nop
-                j       ret_from_irq
-                nop
-#endif
-
-                .align  5
-                .set    reorder
-ll_pci_intD:
-                move    a0,sp
-                jal     pci_intD
-                nop
-                j       ret_from_irq
-                nop
-
-                .align  5
-                .set    reorder
-ll_serial_irq:
-                li      a0,6
-                move    a1,sp
-                jal     do_IRQ
-                nop
-                j       ret_from_irq
-                nop
diff --git a/arch/mips/gt64120/ev64120/irq.c b/arch/mips/gt64120/ev64120/irq.c
index 3b186159b21a..46c468b26b30 100644
--- a/arch/mips/gt64120/ev64120/irq.c
+++ b/arch/mips/gt64120/ev64120/irq.c
@@ -46,14 +46,22 @@
 #include <asm/system.h>
 #include <asm/gt64120.h>
 
-asmlinkage inline void pci_intA(struct pt_regs *regs)
+asmlinkage void plat_irq_dispatch(struct pt_regs *regs)
 {
-        do_IRQ(GT_INTA, regs);
-}
-
-asmlinkage inline void pci_intD(struct pt_regs *regs)
-{
-        do_IRQ(GT_INTD, regs);
+        unsigned int pending = read_c0_status() & read_c0_cause();
+
+        if (pending & STATUSF_IP4)              /* int2 hardware line (timer) */
+                do_IRQ(4, regs);
+        else if (pending & STATUSF_IP2)         /* int0 hardware line */
+                do_IRQ(GT_INTA, regs);
+        else if (pending & STATUSF_IP5)         /* int3 hardware line */
+                do_IRQ(GT_INTD, regs);
+        else if (pending & STATUSF_IP6)         /* int4 hardware line */
+                do_IRQ(6, regs);
+        else if (pending & STATUSF_IP7)         /* compare int */
+                do_IRQ(7, regs);
+        else
+                spurious_interrupt(regs);
 }
 
 static void disable_ev64120_irq(unsigned int irq_nr)
@@ -109,16 +117,11 @@ static struct hw_interrupt_type ev64120_irq_type = {
 
 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);
-
         local_irq_disable();
 
         /*