1 files changed, 115 insertions, 0 deletions
diff --git a/c/src/lib/libcpu/arm/at91rm9200/irq/irq.c b/c/src/lib/libcpu/arm/at91rm9200/irq/irq.c
new file mode 100644
index 0000000000..6bb7be4ac5
--- /dev/null
+++ b/c/src/lib/libcpu/arm/at91rm9200/irq/irq.c
@@ -0,0 +1,115 @@
+/*
+ * Atmel AT91RM9200 Interrupt handler
+ *
+ * Copyright (c) 2004 by Jay Monkman <jtm@lopingdog.com>
+ *      
+ *  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 <at91rm9200.h>
+
+/*
+ * This function check that the value given for the irq line
+ * is valid.
+ */
+static int isValidInterrupt(int irq)
+{
+    if ( (irq < 0) || (irq >= AT91RM9200_MAX_INT)) {
+        return 0;
+    }
+    return 1;
+}
+
+/*
+ * Installs the interrupt handler.
+ */
+int BSP_install_rtems_irq_handler  (const rtems_irq_connect_data* irq)
+{
+    rtems_interrupt_level level;
+    
+    if (!isValidInterrupt(irq->name)) {
+        return 0;
+    }
+    
+    /*
+     * Check if default handler is actually connected. If not, issue 
+     * an error. Note: irq->name is a number corresponding to the 
+     * sources PID (see the at91rm9200_pid for this mapping).  We 
+     * convert it to a long word offset to get source's vector register 
+     */
+    if (AIC_SVR_REG(irq->name * 4) != default_int_handler) {
+        return 0;
+    }
+    
+    _CPU_ISR_Disable(level);
+    
+    /*
+     * store the new handler
+     */
+    AIC_SVR_REG(irq->name * 4) = irq->hdl;
+    
+    /*
+     * unmask interrupt
+     */
+    AIC_CTL_REG(AIC_IECR) = 1 << irq->name;
+    
+    /*
+     * Enable interrupt on device
+     */
+    if(irq->on) {
+        irq->on(irq);
+    }
+    
+    _CPU_ISR_Enable(level);
+    
+    return 1;
+}
+
+/* 
+ * Remove and interrupt handler
+ */
+int BSP_remove_rtems_irq_handler  (const rtems_irq_connect_data* irq)
+{
+    rtems_interrupt_level level;
+  
+    if (!isValidInterrupt(irq->name)) {
+        return 0;
+    }
+
+    /*
+     * Check if the handler is actually connected. If not, issue an error.
+     */
+    if (AIC_SVR_REG(irq->name * 4) != irq->hdl) {
+      return 0;
+    }
+    _CPU_ISR_Disable(level);
+
+    /*
+     * mask interrupt
+     */
+    AIC_CTL_REG(AIC_IDCR) = 1 << irq->name;
+    
+    /*
+     * Disable interrupt on device
+     */
+    if(irq->off) {
+        irq->off(irq);
+    }
+
+    /*
+     * restore the default irq value
+     */
+    AIC_SVR_REG(irq->name * 4) = default_int_handler;
+    
+    _CPU_ISR_Enable(level);
+
+    return 1;
+}