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-rw-r--r--arch/mips/tx4938/common/irq_handler.S84
1 files changed, 84 insertions, 0 deletions
diff --git a/arch/mips/tx4938/common/irq_handler.S b/arch/mips/tx4938/common/irq_handler.S
new file mode 100644
index 00000000000..1b2f72bac42
--- /dev/null
+++ b/arch/mips/tx4938/common/irq_handler.S
@@ -0,0 +1,84 @@
+/*
+ * linux/arch/mips/tx4938/common/handler.S
+ *
+ * Primary interrupt handler for tx4938 based systems
+ * Copyright (C) 2000-2001 Toshiba Corporation
+ *
+ * 2003-2005 (c) MontaVista Software, Inc. This file is licensed under the
+ * terms of the GNU General Public License version 2. This program is
+ * licensed "as is" without any warranty of any kind, whether express
+ * or implied.
+ *
+ * Support for TX4938 in 2.6 - Manish Lachwani (mlachwani@mvista.com)
+ */
+#include <asm/asm.h>
+#include <asm/mipsregs.h>
+#include <asm/addrspace.h>
+#include <asm/regdef.h>
+#include <asm/stackframe.h>
+#include <asm/tx4938/rbtx4938.h>
+
+
+ .align 5
+ NESTED(tx4938_irq_handler, PT_SIZE, sp)
+ SAVE_ALL
+ CLI
+ .set at
+
+ mfc0 t0, CP0_CAUSE
+ mfc0 t1, CP0_STATUS
+ and t0, t1
+
+ andi t1, t0, STATUSF_IP7 /* cpu timer */
+ bnez t1, ll_ip7
+
+ /* IP6..IP3 multiplexed -- do not use */
+
+ andi t1, t0, STATUSF_IP2 /* tx4938 pic */
+ bnez t1, ll_ip2
+
+ andi t1, t0, STATUSF_IP1 /* user line 1 */
+ bnez t1, ll_ip1
+
+ andi t1, t0, STATUSF_IP0 /* user line 0 */
+ bnez t1, ll_ip0
+
+ .set reorder
+
+ nop
+ END(tx4938_irq_handler)
+
+ .align 5
+
+
+ll_ip7:
+ li a0, TX4938_IRQ_CPU_TIMER
+ move a1, sp
+ jal do_IRQ
+ j ret_from_irq
+
+
+ll_ip2:
+ jal tx4938_irq_nested
+ nop
+ beqz v0, goto_spurious_interrupt
+ nop
+ move a0, v0
+ move a1, sp
+ jal do_IRQ
+ j ret_from_irq
+
+goto_spurious_interrupt:
+ j ret_from_irq
+
+ll_ip1:
+ li a0, TX4938_IRQ_USER1
+ move a1, sp
+ jal do_IRQ
+ j ret_from_irq
+
+ll_ip0:
+ li a0, TX4938_IRQ_USER0
+ move a1, sp
+ jal do_IRQ
+ j ret_from_irq