[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, 32 insertions, 133 deletions

diff --git a/arch/mips/momentum/jaguar_atx/Makefile b/arch/mips/momentum/jaguar_atx/Makefile
index 20bbd3ea44a..67372f3f965 100644
--- a/arch/mips/momentum/jaguar_atx/Makefile
+++ b/arch/mips/momentum/jaguar_atx/Makefile
@@ -6,7 +6,7 @@
 # unless it's something special (ie not a .c file).
 #
 
-obj-y += int-handler.o irq.o prom.o reset.o setup.o
+obj-y += irq.o prom.o reset.o setup.o
 
 obj-$(CONFIG_SERIAL_8250_CONSOLE) += ja-console.o
 obj-$(CONFIG_REMOTE_DEBUG) += dbg_io.o
diff --git a/arch/mips/momentum/jaguar_atx/int-handler.S b/arch/mips/momentum/jaguar_atx/int-handler.S
deleted file mode 100644
index 55bc789733f..00000000000
--- a/arch/mips/momentum/jaguar_atx/int-handler.S
+++ /dev/null
@@ -1,128 +0,0 @@
-/*
- * Copyright 2002 Momentum Computer Inc.
- * Author: Matthew Dharm <mdharm@momenco.com>
- *
- * Based on work:
- *   Copyright 2001 MontaVista Software Inc.
- *   Author: jsun@mvista.com or jsun@junsun.net
- *
- * First-level interrupt dispatcher for Jaguar-ATX board.
- *
- * 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.
- */
-#include <asm/asm.h>
-#include <asm/mipsregs.h>
-#include <asm/addrspace.h>
-#include <asm/regdef.h>
-#include <asm/stackframe.h>
-
-/*
- * First level interrupt dispatcher for Ocelot-CS board
- */
-		.align	5
-		NESTED(jaguar_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_IP0	/* sw0 software interrupt */
-		bnez	t1, ll_sw0_irq
-		andi	t1, t0, STATUSF_IP1	/* sw1 software interrupt */
-		bnez	t1, ll_sw1_irq
-		andi	t1, t0, STATUSF_IP2	/* int0 hardware line */
-		bnez	t1, ll_pcixa_irq
-		andi	t1, t0, STATUSF_IP3	/* int1 hardware line */
-		bnez	t1, ll_pcixb_irq
-		andi	t1, t0, STATUSF_IP4	/* int2 hardware line */
-		bnez	t1, ll_pcia_irq
-		andi	t1, t0, STATUSF_IP5	/* int3 hardware line */
-		bnez	t1, ll_pcib_irq
-		andi	t1, t0, STATUSF_IP6	/* int4 hardware line */
-		bnez	t1, ll_uart_irq
-		andi	t1, t0, STATUSF_IP7	/* cpu timer */
-		bnez	t1, ll_cputimer_irq
-
-		nop
-		nop
-
-		/* now look at extended interrupts */
-		mfc0	t0, CP0_CAUSE
-		cfc0	t1, CP0_S1_INTCONTROL
-
-		/* shift the mask 8 bits left to line up the bits */
-		sll	t2, t1, 8
-
-		and	t0, t2
-		srl	t0, t0, 16
-
-		andi	t1, t0, STATUSF_IP8	/* int6 hardware line */
-		bnez	t1, ll_mv64340_decode_irq
-
-		nop
-		nop
-
-		.set	reorder
-
-		/* wrong alarm or masked ... */
-		j	spurious_interrupt
-		nop
-		END(jaguar_handle_int)
-
-		.align	5
-ll_sw0_irq:
-		li	a0, 0
-		move	a1, sp
-		jal	do_IRQ
-		j	ret_from_irq
-ll_sw1_irq:
-		li	a0, 1
-		move	a1, sp
-		jal	do_IRQ
-		j	ret_from_irq
-ll_pcixa_irq:
-		li	a0, 2
-		move	a1, sp
-		jal	do_IRQ
-		j	ret_from_irq
-
-ll_pcixb_irq:
-		li	a0, 3
-		move	a1, sp
-		jal	do_IRQ
-		j	ret_from_irq
-
-ll_pcia_irq:
-		li	a0, 4
-		move	a1, sp
-		jal	do_IRQ
-		j	ret_from_irq
-
-ll_pcib_irq:
-		li	a0, 5
-		move	a1, sp
-		jal	do_IRQ
-		j	ret_from_irq
-
-ll_uart_irq:
-		li	a0, 6
-		move	a1, sp
-		jal	do_IRQ
-		j	ret_from_irq
-
-ll_cputimer_irq:
-		li	a0, 7
-		move	a1, sp
-		jal	ll_timer_interrupt
-		j	ret_from_irq
-
-ll_mv64340_decode_irq:
-		move	a0, sp
-		jal	ll_mv64340_irq
-		j	ret_from_irq
diff --git a/arch/mips/momentum/jaguar_atx/irq.c b/arch/mips/momentum/jaguar_atx/irq.c
index 15588f91ace..ec4032b38f1 100644
--- a/arch/mips/momentum/jaguar_atx/irq.c
+++ b/arch/mips/momentum/jaguar_atx/irq.c
@@ -10,7 +10,7 @@
  *   Copyright 2001 MontaVista Software Inc.
  *   Author: Jun Sun, jsun@mvista.com or jsun@junsun.net
  *
- *   Copyright (C) 2000, 2001 Ralf Baechle (ralf@gnu.org)
+ *   Copyright (C) 2000, 01, 06 Ralf Baechle (ralf@linux-mips.org)
  *
  *  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
@@ -38,8 +38,37 @@
 #include <linux/types.h>
 #include <asm/irq_cpu.h>
 #include <asm/mipsregs.h>
+#include <asm/time.h>
 
-extern asmlinkage void jaguar_handle_int(void);
+asmlinkage void plat_irq_dispatch(struct pt_regs *regs)
+{
+	unsigned int pending = read_c0_cause() & read_c0_status();
+
+	if (pending & STATUSF_IP0)
+		do_IRQ(0, regs);
+	else if (pending & STATUSF_IP1)
+		do_IRQ(1, regs);
+	else if (pending & STATUSF_IP2)
+		do_IRQ(2, regs);
+	else if (pending & STATUSF_IP3)
+		do_IRQ(3, regs);
+	else if (pending & STATUSF_IP4)
+		do_IRQ(4, regs);
+	else if (pending & STATUSF_IP5)
+		do_IRQ(5, regs);
+	else if (pending & STATUSF_IP6)
+		do_IRQ(6, regs);
+	else if (pending & STATUSF_IP7)
+		ll_timer_interrupt(7, regs);
+	else {
+		/*
+		 * Now look at the extended interrupts
+		 */
+		pending = (read_c0_cause() & (read_c0_intcontrol() << 8)) >> 16;
+		if (pending & STATUSF_IP8)
+			ll_mv64340_irq(regs);
+	}
+}
 
 static struct irqaction cascade_mv64340 = {
 	no_action, SA_INTERRUPT, CPU_MASK_NONE, "MV64340-Cascade", NULL, NULL
@@ -53,8 +82,6 @@ void __init arch_init_irq(void)
 	 */
 	clear_c0_status(ST0_IM);
 
-	/* Sets the first-level interrupt dispatcher. */
-	set_except_vector(0, jaguar_handle_int);
 	mips_cpu_irq_init(0);
 	rm7k_cpu_irq_init(8);