[MIPS] Fix the crime against humanity that mipsIRQ.S is.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/mips-boards/atlas/Makefile

@@ -16,5 +16,5 @@
 # 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
 #
 
-obj-y			:= atlas_int.o atlas_setup.o
+obj-y			:= atlas_int.o atlas-irq.o atlas_setup.o
 obj-$(CONFIG_KGDB)	+= atlas_gdb.o

arch/mips/mips-boards/atlas/atlas-irq.S

@@ -2,8 +2,6 @@
  * 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.
@@ -17,10 +15,7 @@
  *  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 <linux/config.h>
 
@@ -28,33 +23,9 @@
 #include <asm/mipsregs.h>
 #include <asm/regdef.h>
 #include <asm/stackframe.h>
-
-#ifdef CONFIG_MIPS_ATLAS
 #include <asm/mips-boards/atlasint.h>
-#define CASCADE_IRQ		MIPSCPU_INT_ATLAS
-#define CASCADE_DISPATCH	atlas_hw0_irqdispatch
-#endif
-#ifdef CONFIG_MIPS_MALTA
-#include <asm/mips-boards/maltaint.h>
-#define CASCADE_IRQ		MIPSCPU_INT_I8259A
-#define CASCADE_DISPATCH	malta_hw0_irqdispatch
-#endif
-#ifdef CONFIG_MIPS_SEAD
-#include <asm/mips-boards/seadint.h>
-#endif
 
-/* A lot of complication here is taken away because:
+/*
- *
- * 1) We handle one interrupt and return, sitting in a loop and moving across
- *    all the pending IRQ bits in the cause register is _NOT_ the answer, the
- *    common case is one pending IRQ so optimize in that direction.
- *
- * 2) We need not check against bits in the status register IRQ mask, that
- *    would make this routine slow as hell.
- *
- * 3) Linux only thinks in terms of all IRQs on or all IRQs off, nothing in
- *    between like BSD spl() brain-damage.
- *
  * Furthermore, the IRQs on the MIPS board look basically (barring software
  * IRQs which we don't use at all and all external interrupt sources are
  * combined together on hardware interrupt 0 (MIPS IRQ 2)) like:
@@ -127,31 +98,23 @@
 	# sll	s0, t0
 #endif
 
-#ifdef CASCADE_IRQ
+	 li	a1, MIPSCPU_INT_ATLAS
-	 li	a1, CASCADE_IRQ
 	bne	a0, a1, 1f
 	 addu	a0, MIPSCPU_INT_BASE
 
-	jal	CASCADE_DISPATCH
+	jal	atlas_hw0_irqdispatch
 	 move	 a0, sp
 
 	j	ret_from_irq
 	 nop
-1:
-#else
-	 addu	a0, MIPSCPU_INT_BASE
-#endif
 
-	jal	do_IRQ
+1:	jal	do_IRQ
 	 move	a1, sp
 
 	j	ret_from_irq
 	 nop
 
-
 spurious:
-	jal	spurious_interrupt
+	j	spurious_interrupt
-	 nop
-	j	ret_from_irq
 	 nop
 	END(mipsIRQ)

arch/mips/mips-boards/generic/Makefile

@@ -18,8 +18,8 @@
 # Makefile for the MIPS boards generic routines under Linux.
 #
 
-obj-y				:= mipsIRQ.o reset.o display.o init.o memory.o \
+obj-y				:= reset.o display.o init.o memory.o printf.o \
-				   printf.o cmdline.o time.o
+				   cmdline.o time.o
 obj-$(CONFIG_PCI)		+= pci.o
 obj-$(CONFIG_KGDB)		+= gdb_hook.o
 

arch/mips/mips-boards/malta/Makefile

@@ -19,4 +19,4 @@
 # under Linux.
 #
 
-obj-y := malta_int.o malta_setup.o
+obj-y := malta_int.o malta-irq.o malta_setup.o

arch/mips/mips-boards/malta/malta-irq.S

@@ -0,0 +1,122 @@
+/*
+ * 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 <linux/config.h>
+
+#include <asm/asm.h>
+#include <asm/mipsregs.h>
+#include <asm/regdef.h>
+#include <asm/stackframe.h>
+#include <asm/mips-boards/maltaint.h>
+
+/*
+ * IRQs on the Malta board look basically (barring software IRQs which we
+ * don't use at all and all external interrupt sources are combined together
+ * on hardware interrupt 0 (MIPS IRQ 2)) like:
+ *
+ *	MIPS IRQ	Source
+ *      --------        ------
+ *             0	Software (ignored)
+ *             1        Software (ignored)
+ *             2        Combined hardware interrupt (hw0)
+ *             3        Hardware (ignored)
+ *             4        Hardware (ignored)
+ *             5        Hardware (ignored)
+ *             6        Hardware (ignored)
+ *             7        R4k timer (what we use)
+ *
+ * We handle the IRQ according to _our_ priority which is:
+ *
+ * Highest ----     R4k Timer
+ * Lowest  ----     Combined hardware interrupt
+ *
+ * then we just return, if multiple IRQs are pending then we will just take
+ * another exception, big deal.
+ */
+
+	.text
+	.set	noreorder
+	.set	noat
+	.align	5
+	NESTED(mipsIRQ, PT_SIZE, sp)
+	SAVE_ALL
+	CLI
+	.set	at
+
+	mfc0	s0, CP0_CAUSE		# get irq bits
+	mfc0	s1, CP0_STATUS		# get irq mask
+	andi	s0, ST0_IM		# CAUSE.CE may be non-zero!
+	and	s0, s1
+
+#if defined(CONFIG_CPU_MIPS32) || defined(CONFIG_CPU_MIPS64)
+ 	.set	mips32
+	clz	a0, s0
+	.set	mips0
+	negu	a0
+	addu	a0, 31-CAUSEB_IP
+	bltz	a0, spurious
+#else
+	beqz	s0, spurious
+	 li	a0, 7
+
+	and	t0, s0, 0xf000
+	sltiu	t0, t0, 1
+	sll	t0, 2
+	subu	a0, t0
+	sll	s0, t0
+
+	and	t0, s0, 0xc000
+	sltiu	t0, t0, 1
+	sll	t0, 1
+	subu	a0, t0
+	sll	s0, t0
+
+	and	t0, s0, 0x8000
+	sltiu	t0, t0, 1
+	# sll	t0, 0
+	subu	a0, t0
+	# sll	s0, t0
+#endif
+
+	 li	a1, MIPSCPU_INT_I8259A
+	bne	a0, a1, 1f
+	 addu	a0, MIPSCPU_INT_BASE
+
+	jal	malta_hw0_irqdispatch
+	 move	 a0, sp
+
+	j	ret_from_irq
+	 nop
+1:
+
+	jal	do_IRQ
+	 move	a1, sp
+
+	j	ret_from_irq
+	 nop
+
+spurious:
+	j	spurious_interrupt
+	 nop
+	END(mipsIRQ)

arch/mips/mips-boards/sead/Makefile

@@ -23,4 +23,4 @@
 # under Linux.
 #
 
-obj-y		:= sead_int.o sead_setup.o
+obj-y		:= sead_int.o sead-irq.o sead_setup.o

arch/mips/mips-boards/sead/sead-irq.S

@@ -0,0 +1,111 @@
+/*
+ * 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 <linux/config.h>
+
+#include <asm/asm.h>
+#include <asm/mipsregs.h>
+#include <asm/regdef.h>
+#include <asm/stackframe.h>
+#include <asm/mips-boards/seadint.h>
+
+/*
+ * IRQs on the SEAD board look basically are combined together on hardware
+ * interrupt 0 (MIPS IRQ 2)) like:
+ *
+ *	MIPS IRQ	Source
+ *      --------        ------
+ *             0	Software (ignored)
+ *             1        Software (ignored)
+ *             2        UART0 (hw0)
+ *             3        UART1 (hw1)
+ *             4        Hardware (ignored)
+ *             5        Hardware (ignored)
+ *             6        Hardware (ignored)
+ *             7        R4k timer (what we use)
+ *
+ * We handle the IRQ according to _our_ priority which is:
+ *
+ * Highest ----     R4k Timer
+ * Lowest  ----     Combined hardware interrupt
+ *
+ * then we just return, if multiple IRQs are pending then we will just take
+ * another exception, big deal.
+ */
+
+	.text
+	.set	noreorder
+	.set	noat
+	.align	5
+	NESTED(mipsIRQ, PT_SIZE, sp)
+	SAVE_ALL
+	CLI
+	.set	at
+
+	mfc0	s0, CP0_CAUSE		# get irq bits
+	mfc0	s1, CP0_STATUS		# get irq mask
+	andi	s0, ST0_IM		# CAUSE.CE may be non-zero!
+	and	s0, s1
+
+#if defined(CONFIG_CPU_MIPS32) || defined(CONFIG_CPU_MIPS64)
+ 	.set	mips32
+	clz	a0, s0
+	.set	mips0
+	negu	a0
+	addu	a0, 31-CAUSEB_IP
+	bltz	a0, spurious
+#else
+	beqz	s0, spurious
+	 li	a0, 7
+
+	and	t0, s0, 0xf000
+	sltiu	t0, t0, 1
+	sll	t0, 2
+	subu	a0, t0
+	sll	s0, t0
+
+	and	t0, s0, 0xc000
+	sltiu	t0, t0, 1
+	sll	t0, 1
+	subu	a0, t0
+	sll	s0, t0
+
+	and	t0, s0, 0x8000
+	sltiu	t0, t0, 1
+	# sll	t0, 0
+	subu	a0, t0
+	# sll	s0, t0
+#endif
+
+	 addu	a0, MIPSCPU_INT_BASE
+	jal	do_IRQ
+	 move	a1, sp
+
+	j	ret_from_irq
+	 nop
+
+spurious:
+	j	spurious_interrupt
+	 nop
+	END(mipsIRQ)

include/asm-mips/mips-boards/atlas.h

@@ -33,12 +33,28 @@
 #define ATLAS_RTC_ADR_REG       0x1f000800
 #define ATLAS_RTC_DAT_REG       0x1f000808
 
-
 /*
  * Atlas interrupt controller register base.
  */
 #define ATLAS_ICTRL_REGS_BASE   0x1f000000
 
+/*
+ * Atlas registers are memory mapped on 64-bit aligned boundaries and
+ * only word access are allowed.
+ */
+struct atlas_ictrl_regs {
+	volatile unsigned int intraw;
+	int dummy1;
+	volatile unsigned int intseten;
+	int dummy2;
+	volatile unsigned int intrsten;
+	int dummy3;
+	volatile unsigned int intenable;
+	int dummy4;
+	volatile unsigned int intstatus;
+	int dummy5;
+};
+
 /*
  * Atlas UART register base.
  */

include/asm-mips/mips-boards/atlasint.h

@@ -62,23 +62,4 @@
 #define ATLASINT_RES31		(ATLASINT_BASE+31)
 #define ATLASINT_END		(ATLASINT_BASE+31)
 
-/*
- * Atlas registers are memory mapped on 64-bit aligned boundaries and
- * only word access are allowed.
- */
-struct atlas_ictrl_regs {
-        volatile unsigned int intraw;
-        int dummy1;
-        volatile unsigned int intseten;
-        int dummy2;
-        volatile unsigned int intrsten;
-        int dummy3;
-        volatile unsigned int intenable;
-        int dummy4;
-        volatile unsigned int intstatus;
-        int dummy5;
-};
-
-extern void atlasint_init(void);
-
 #endif /* !(_MIPS_ATLASINT_H) */