[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, 25 insertions, 96 deletions

diff --git a/arch/mips/sgi-ip32/Makefile b/arch/mips/sgi-ip32/Makefile
index 470898f4afe1..530bf848c3d0 100644
--- a/arch/mips/sgi-ip32/Makefile
+++ b/arch/mips/sgi-ip32/Makefile
@@ -3,7 +3,7 @@
 # under Linux.
 #
 
-obj-y   += ip32-berr.o ip32-irq.o ip32-irq-glue.o ip32-setup.o ip32-reset.o \
+obj-y   += ip32-berr.o ip32-irq.o ip32-setup.o ip32-reset.o \
            crime.o ip32-memory.o
 
 EXTRA_AFLAGS := $(CFLAGS)
diff --git a/arch/mips/sgi-ip32/ip32-irq-glue.S b/arch/mips/sgi-ip32/ip32-irq-glue.S
deleted file mode 100644
index 200924e1c4f5..000000000000
--- a/arch/mips/sgi-ip32/ip32-irq-glue.S
+++ /dev/null
@@ -1,86 +0,0 @@
-/*
- * Low level interrupt handler for the SGI O2 aka IP32 aka Moosehead
- *
- * This file is subject to the terms and conditions of the GNU General Public
- * License.  See the file "COPYING" in the main directory of this archive
- * for more details.
- *
- * Copyright (C) 2000 Harald Koerfgen
- * Copyright (C) 2001 Keith M Wesolowski
- */
-#include <asm/asm.h>
-#include <asm/regdef.h>
-#include <asm/mipsregs.h>
-#include <asm/stackframe.h>
-#include <asm/addrspace.h>
-
-                .text
-                .set    noreorder
-                .set    noat
-                .align  5
-                NESTED(ip32_handle_int, PT_SIZE, ra)
-                .set    noat
-                SAVE_ALL
-                CLI                     # TEST: interrupts should be off
-                .set    at
-                .set    noreorder
-
-                mfc0    s0,CP0_CAUSE
-
-                andi    t1, s0, IE_IRQ0
-                bnez    t1, handle_irq0
-                 andi   t1, s0, IE_IRQ1
-                bnez    t1, handle_irq1
-                 andi   t1, s0, IE_IRQ2
-                bnez    t1, handle_irq2
-                 andi   t1, s0, IE_IRQ3
-                bnez    t1, handle_irq3
-                 andi   t1, s0, IE_IRQ4
-                bnez    t1, handle_irq4
-                 andi   t1, s0, IE_IRQ5
-                bnez    t1, handle_irq5
-                 nop
-
-                /* Either someone has triggered the "software interrupts"
-                 * or we lost an interrupt somehow.  Ignore it.
-                 */
-                j       ret_from_irq
-                 nop
-
-handle_irq0:
-                jal     ip32_irq0
-                 move   a0, sp
-                j       ret_from_irq
-                 nop
-
-handle_irq1:
-                jal     ip32_irq1
-                 move   a0, sp
-                j       ret_from_irq
-                 nop
-
-handle_irq2:
-                jal     ip32_irq2
-                 move   a0, sp
-                j       ret_from_irq
-                 nop
-
-handle_irq3:
-                jal     ip32_irq3
-                 move   a0, sp
-                j       ret_from_irq
-                 nop
-
-handle_irq4:
-                jal     ip32_irq4
-                 move   a0, sp
-                j       ret_from_irq
-                 nop
-
-handle_irq5:
-                jal     ip32_irq5
-                move    a0, sp
-                j       ret_from_irq
-                 nop
-
-                END(ip32_handle_int)
diff --git a/arch/mips/sgi-ip32/ip32-irq.c b/arch/mips/sgi-ip32/ip32-irq.c
index 2eb22d692ed9..22a6df94b4a1 100644
--- a/arch/mips/sgi-ip32/ip32-irq.c
+++ b/arch/mips/sgi-ip32/ip32-irq.c
@@ -130,8 +130,6 @@ struct irqaction memerr_irq = { crime_memerr_intr, SA_INTERRUPT,
 struct irqaction cpuerr_irq = { crime_cpuerr_intr, SA_INTERRUPT,
                         CPU_MASK_NONE, "CRIME CPU error", NULL, NULL };
 
-extern void ip32_handle_int(void);
-
 /*
  * For interrupts wired from a single device to the CPU.  Only the clock
  * uses this it seems, which is IRQ 0 and IP7.
@@ -503,7 +501,7 @@ static void ip32_unknown_interrupt(struct pt_regs *regs)
 
 /* CRIME 1.1 appears to deliver all interrupts to this one pin. */
 /* change this to loop over all edge-triggered irqs, exception masked out ones */
-void ip32_irq0(struct pt_regs *regs)
+static void ip32_irq0(struct pt_regs *regs)
 {
         uint64_t crime_int;
         int irq = 0;
@@ -520,31 +518,49 @@ void ip32_irq0(struct pt_regs *regs)
         do_IRQ(irq, regs);
 }
 
-void ip32_irq1(struct pt_regs *regs)
+static void ip32_irq1(struct pt_regs *regs)
 {
         ip32_unknown_interrupt(regs);
 }
 
-void ip32_irq2(struct pt_regs *regs)
+static void ip32_irq2(struct pt_regs *regs)
 {
         ip32_unknown_interrupt(regs);
 }
 
-void ip32_irq3(struct pt_regs *regs)
+static void ip32_irq3(struct pt_regs *regs)
 {
         ip32_unknown_interrupt(regs);
 }
 
-void ip32_irq4(struct pt_regs *regs)
+static void ip32_irq4(struct pt_regs *regs)
 {
         ip32_unknown_interrupt(regs);
 }
 
-void ip32_irq5(struct pt_regs *regs)
+static void ip32_irq5(struct pt_regs *regs)
 {
         ll_timer_interrupt(IP32_R4K_TIMER_IRQ, regs);
 }
 
+asmlinkage void plat_irq_dispatch(struct pt_regs *regs)
+{
+        unsigned int pending = read_c0_cause();
+
+        if (likely(pending & IE_IRQ0))
+                ip32_irq0(regs);
+        else if (unlikely(pending & IE_IRQ1))
+                ip32_irq1(regs);
+        else if (unlikely(pending & IE_IRQ2))
+                ip32_irq2(regs);
+        else if (unlikely(pending & IE_IRQ3))
+                ip32_irq3(regs);
+        else if (unlikely(pending & IE_IRQ4))
+                ip32_irq4(regs);
+        else if (likely(pending & IE_IRQ5))
+                ip32_irq5(regs);
+}
+
 void __init arch_init_irq(void)
 {
         unsigned int irq;
@@ -556,7 +572,6 @@ void __init arch_init_irq(void)
         crime->soft_int = 0;
         mace->perif.ctrl.istat = 0;
         mace->perif.ctrl.imask = 0;
-        set_except_vector(0, ip32_handle_int);
 
         for (irq = 0; irq <= IP32_IRQ_MAX; irq++) {
                 hw_irq_controller *controller;