From c32b1efa43e31bd9a8a7eae3623664d00c34d842 Mon Sep 17 00:00:00 2001
From: Alan Cudmore <alan.cudmore@gmail.com>
Date: Sat, 23 Mar 2013 19:13:07 +0100
Subject: bsp/raspberrypi: New BSP

---
 c/src/lib/libbsp/arm/raspberrypi/irq/irq.c | 124 +++++++++++++++++++++++++++++
 1 file changed, 124 insertions(+)
 create mode 100644 c/src/lib/libbsp/arm/raspberrypi/irq/irq.c

(limited to 'c/src/lib/libbsp/arm/raspberrypi/irq/irq.c')

diff --git a/c/src/lib/libbsp/arm/raspberrypi/irq/irq.c b/c/src/lib/libbsp/arm/raspberrypi/irq/irq.c
new file mode 100644
index 0000000000..fc0b74a92e
--- /dev/null
+++ b/c/src/lib/libbsp/arm/raspberrypi/irq/irq.c
@@ -0,0 +1,124 @@
+/**
+ * @file
+ *
+ * @ingroup bsp_interrupt
+ *
+ * @brief Interrupt support.
+ */
+
+/*
+ * Copyright (c) 2009
+ * embedded brains GmbH
+ * Obere Lagerstr. 30
+ * D-82178 Puchheim
+ * Germany
+ * <rtems@embedded-brains.de>
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rtems.com/license/LICENSE.
+ */
+
+#include <rtems/score/armv4.h>
+
+#include <bsp.h>
+#include <bsp/irq.h>
+#include <bsp/irq-generic.h>
+#include <bsp/raspberrypi.h>
+#include <bsp/linker-symbols.h>
+#include <bsp/mmu.h>
+
+/*
+** This sets the main exception vectors
+*/
+void raspberrypi_set_exception_handler(
+                        Arm_symbolic_exception_name exception,
+                        void (*handler)(void)
+                                       )
+{
+    if ((unsigned) exception < MAX_EXCEPTIONS)
+    {
+        uint32_t *table = (uint32_t *) bsp_section_vector_begin + MAX_EXCEPTIONS;
+        table [exception] = (uint32_t) handler;
+
+    }
+}
+
+/*
+** Determine the source of the interrupt and dispatch the correct handler.
+*/
+void bsp_interrupt_dispatch(void)
+{
+  rtems_vector_number vector = 255;
+
+  /* ARM timer */
+  if (BCM2835_REG(BCM2835_IRQ_BASIC) && 0x1)
+  {
+      vector = BCM2835_IRQ_ID_TIMER_0;
+
+  }
+  /* UART 0 */
+  else if ( BCM2835_REG(BCM2835_IRQ_BASIC) && BCM2835_BIT(19))
+  {
+      vector = BCM2835_IRQ_ID_UART;
+  }
+
+  if ( vector < 255 )
+  {
+      bsp_interrupt_handler_dispatch(vector);
+  }
+
+}
+
+rtems_status_code bsp_interrupt_vector_enable(rtems_vector_number vector)
+{
+  rtems_interrupt_level  level;
+
+  rtems_interrupt_disable(level);
+
+   /* ARM Timer */
+  if ( vector == BCM2835_IRQ_ID_TIMER_0 )
+  {
+      BCM2835_REG(BCM2835_IRQ_ENABLE_BASIC) = 0x1;
+  }
+  /* UART 0 */
+  else if ( vector == BCM2835_IRQ_ID_UART )
+  {
+      BCM2835_REG(BCM2835_IRQ_ENABLE2) =  BCM2835_BIT(25);
+
+  }
+  rtems_interrupt_enable(level);
+
+  return RTEMS_SUCCESSFUL;
+}
+
+rtems_status_code bsp_interrupt_vector_disable(rtems_vector_number vector)
+{
+  rtems_interrupt_level level;
+
+  rtems_interrupt_disable(level);
+
+  if ( vector == BCM2835_IRQ_ID_TIMER_0 )
+  {
+      BCM2835_REG(BCM2835_IRQ_DISABLE_BASIC) = 0x1;
+  }
+  else if ( vector == BCM2835_IRQ_ID_UART )
+  {
+      BCM2835_REG(BCM2835_IRQ_DISABLE2) = BCM2835_BIT(25);
+  }
+  rtems_interrupt_enable(level);
+
+  return RTEMS_SUCCESSFUL;
+}
+
+
+void bsp_interrupt_handler_default(rtems_vector_number vector)
+{
+    printk("spurious interrupt: %u\n", vector);
+}
+
+rtems_status_code bsp_interrupt_facility_initialize(void)
+{
+   raspberrypi_set_exception_handler(ARM_EXCEPTION_IRQ, _ARMV4_Exception_interrupt);
+   return RTEMS_SUCCESSFUL;
+}
-- 
cgit v1.2.3