aboutsummaryrefslogtreecommitdiff
path: root/arch/mips/mips-boards/sead
diff options
context:
space:
mode:
authorRalf Baechle <ralf@linux-mips.org>2006-04-03 13:17:41 +0100
committerRalf Baechle <ralf@linux-mips.org>2006-04-19 04:14:21 +0200
commitd35d473c25d43d7db3e5e18b66d558d2a631cca8 (patch)
tree2351622ad74bb5f09ee2faf0daf6581e7b9e47c5 /arch/mips/mips-boards/sead
parentfde3505c695e0de8ae7504b58d373db2d0ba498a (diff)
[MIPS] Fix the crime against humanity that mipsIRQ.S is.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/mips-boards/sead')
-rw-r--r--arch/mips/mips-boards/sead/Makefile2
-rw-r--r--arch/mips/mips-boards/sead/sead-irq.S111
2 files changed, 112 insertions, 1 deletions
diff --git a/arch/mips/mips-boards/sead/Makefile b/arch/mips/mips-boards/sead/Makefile
index 224bb848f16..01780b60534 100644
--- a/arch/mips/mips-boards/sead/Makefile
+++ b/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
diff --git a/arch/mips/mips-boards/sead/sead-irq.S b/arch/mips/mips-boards/sead/sead-irq.S
new file mode 100644
index 00000000000..d5dea1d2e22
--- /dev/null
+++ b/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)