add ls3aserver timer irq process.

Change-Id: I1cd2a0f71d6b029f618681bcdce6399fec2cf358
Signed-off-by: qiaochong <qiaochong@loongson.cn>

Targets/Bonito3aserver/conf/files.Bonito3aserver

@@ -14,6 +14,7 @@ file    Targets/Bonito3aserver/pci/sb700_ide.c  amd_780e
 file    Targets/Bonito3aserver/pci/sb700_lpc.c  amd_780e
 file    Targets/Bonito3aserver/pci/sb700_sata.c  amd_780e
 file    Targets/Bonito3aserver/pci/sb700_usb.c  amd_780e
+file	Targets/Bonito3aserver/dev/irq.c	timer_irq needs-flag
 
 define  localbus { [base = -1 ] }
 device  localbus

Targets/Bonito3aserver/dev/irq.c

@@ -0,0 +1,36 @@
+#include <pmon.h>
+#include <errno.h>
+#include <asm/mipsregs.h>
+#define ST0_IM  0x0000ff00
+#define CAUSEF_IP7      ( 1 << 15)
+#define CAUSEF_IP6      ( 1 << 14)
+#define CAUSEF_IP5      ( 1 << 13)
+#define CAUSEF_IP4      ( 1 << 12)                                                                                                                     
+#define CAUSEF_IP3      ( 1 << 11)
+#define CAUSEF_IP2      ( 1 << 10)
+void plat_irq_dispatch(struct trapframe *frame)
+{
+        unsigned int cause = read_c0_cause() & ST0_IM;
+        unsigned int status = read_c0_status() & ST0_IM;
+        unsigned int pending = cause & status;
+        if(pending & CAUSEF_IP7)
+        {
+		static int cnt=0;
+		printf("cnt %d\n",cnt++);
+		write_c0_compare(read_c0_count()+100000000/100);
+        }
+        else
+        {
+                printf("spurious interrupt\n");
+        }
+
+}
+
+
+void init_IRQ()
+{
+	write_c0_compare(100000000/100);
+	write_c0_count(0);
+	set_c0_status(0x8001);
+}
+