[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>
diff --git a/arch/mips/lasat/Makefile b/arch/mips/lasat/Makefile
index 0d5aec4..99f5046 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 852a419..2d3472b 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 @@
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 @@
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 2a2b0d0..0000000
--- 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)