2007-04-25 Ray Xu <xr@trasin.net>

	* lpc22xx/irq/bsp_irq_init.c
	lpc22xx/irq/irq.c, lpc22xx/irq/irq.h: New (Initial submission).

1 files changed, 129 insertions, 0 deletions

diff --git a/c/src/lib/libcpu/arm/lpc22xx/irq/irq.c b/c/src/lib/libcpu/arm/lpc22xx/irq/irq.c
new file mode 100644
index 0000000000..9738042b43
--- /dev/null
+++ b/c/src/lib/libcpu/arm/lpc22xx/irq/irq.c
@@ -0,0 +1,129 @@
+/*
+ * Philps LPC22XX Interrupt handler
+ * 
+ * Copyright (c) 2004 by Jay Monkman <jtm@lopingdog.com>
+ * Modified by ray     
+ *  The license and distribution terms for this file may be
+ *  found in the file LICENSE in this distribution or at
+ *
+ *  http://www.OARcorp.com/rtems/license.html.
+ *
+ *  $Id$
+ */
+#include <bsp.h>
+#include <irq.h>
+#include <rtems/score/thread.h>
+#include <rtems/score/apiext.h>
+#include <lpc22xx.h>
+
+/*
+ * This function check that the value given for the irq line
+ * is valid.
+ */
+static int isValidInterrupt(int irq)
+{
+  if ( (irq < 0) || (irq >= BSP_MAX_INT))
+    return 0;
+  return 1;
+}
+
+/*
+ * Installs the interrupt handler.
+ *
+ * You should only have to add the code to unmask the interrupt.
+ *
+ */
+int BSP_install_rtems_irq_handler  (const rtems_irq_connect_data* irq)
+{
+    rtems_interrupt_level level;
+    rtems_irq_hdl *bsp_tbl;
+    int *vic_cntl;
+    static int     irq_counter=0;
+    
+    bsp_tbl = (rtems_irq_hdl *)VICVectAddrBase;
+
+    vic_cntl=(int *)VICVectCntlBase;
+    
+    if (!isValidInterrupt(irq->name)) {
+      return 0;
+    }
+
+    /*
+     * Check if default handler is actually connected. If not issue an error.
+     */
+
+    if (bsp_tbl[irq_counter] != default_int_handler) {
+      return 0;
+    }
+
+    _CPU_ISR_Disable(level);
+
+    /*
+     * store the new handler
+     */
+    bsp_tbl[irq_counter] = irq->hdl;
+    /* *(volatile unsigned long*)(VICVectAddr0+(irq->name * 4)&0x7c )= (uint32_t) irq->hdl;*/
+    /*
+     * Enable interrupt on device
+     */
+    vic_cntl[irq_counter] = 0x20 | irq->name;
+
+    VICIntEnable |= 1 << irq->name; 
+    
+    if(irq->on)
+    {
+    	irq->on(irq);
+    }
+
+    irq_counter++;    
+
+    _CPU_ISR_Enable(level);
+    
+    return 1;
+}
+
+/* 
+ * Remove and interrupt handler
+ *
+ * You should only have to add the code to mask the interrupt.
+ *
+ */
+int BSP_remove_rtems_irq_handler  (const rtems_irq_connect_data* irq)
+{
+    rtems_interrupt_level level;
+    rtems_irq_hdl *bsp_tbl;
+
+    bsp_tbl = (rtems_irq_hdl *)&VICVectAddr0;
+  
+    if (!isValidInterrupt(irq->name)) {
+      return 0;
+    }
+    /*
+     * Check if the handler is actually connected. If not issue an error.
+     */
+    if (bsp_tbl[irq->name] != irq->hdl) {
+      return 0;
+    }
+
+    _CPU_ISR_Disable(level);
+
+    VICIntEnClr = 1 << irq->name;
+
+    /*
+     * Disable interrupt on device
+     */
+    if(irq->off) {
+        irq->off(irq);
+    }
+    /*
+     * restore the default irq value
+     */
+    bsp_tbl[irq->name] = default_int_handler;
+    
+
+    _CPU_ISR_Enable(level);
+
+    return 1;
+}
+
+