From cbb675b0c2f7ad6849fa04295d6fc94991004240 Mon Sep 17 00:00:00 2001
From: patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3>
Date: Mon, 13 Apr 2009 23:24:37 +0000
Subject: [PATCH] Add interrupt decode logic for i.MX

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@1701 42af7a65-404d-4744-a932-0658087f49c3
---
 Documentation/NuttX.html             |  23 ++++-
 arch/arm/src/dm320/dm320_decodeirq.c |  10 ++-
 arch/arm/src/imx/Make.defs           |   2 +-
 arch/arm/src/imx/imx_aitc.h          |   6 ++
 arch/arm/src/imx/imx_decodeirq.c     | 123 +++++++++++++++++++++++++++
 5 files changed, 158 insertions(+), 6 deletions(-)
 create mode 100644 arch/arm/src/imx/imx_decodeirq.c

diff --git a/Documentation/NuttX.html b/Documentation/NuttX.html
index 17f79e23ca1..bb5c3eac7ae 100644
--- a/Documentation/NuttX.html
+++ b/Documentation/NuttX.html
@@ -790,6 +790,27 @@
      </p>
   </td>
 </tr>
+<tr>
+  <td valign="top"><img height="20" width="20" src="favicon.ico"></td>
+  <td bgcolor="#5eaee1">
+    <b>ARM920T</b>.
+  </td>
+</tr>
+<tr>
+  <td><br></td>
+  <td>
+    <p>
+      <b>Freescale MC9328MX1</b> or <b>i.MX1</b>.
+      This port uses the Freescale MX1ADS development board with a GNU arm-elf toolchain*
+      under either Linux or Cygwin.
+    </p>
+    <p>
+      <b>STATUS:</b>
+        This port is in progress.  Coding is complete on the basic port (timer, serial console).
+        Verified support for the i.MX1 will be announced in a future release of NuttX.
+    </p>
+   </td>
+</tr>
 <tr>
   <td valign="top"><img height="20" width="20" src="favicon.ico"></td>
   <td bgcolor="#5eaee1">
@@ -1433,7 +1454,7 @@ buildroot-0.1.4 2009-xx-xx &lt;spudmonkey@racsa.co.cr&gt;
   </tr>
 </table>
 <ul>
-  <li>ARM, ARM7 ARM7TDMI, ARM9, ARM926EJS are trademarks of Advanced RISC Machines, Limited.</li>
+  <li>ARM, ARM7 ARM7TDMI, ARM9, ARM920T, ARM926EJS are trademarks of Advanced RISC Machines, Limited.</li>
   <li>Cygwin is a trademark of Red Hat, Incorporated.</li>
   <li>Linux is a registered trademark of Linus Torvalds.</li>
   <li>LPC2148 is a trademark of NXP Semiconductors.</li>
diff --git a/arch/arm/src/dm320/dm320_decodeirq.c b/arch/arm/src/dm320/dm320_decodeirq.c
index fad9f0faf44..1b5ac401fcd 100644
--- a/arch/arm/src/dm320/dm320_decodeirq.c
+++ b/arch/arm/src/dm320/dm320_decodeirq.c
@@ -1,7 +1,8 @@
 /********************************************************************************
- * dm320/dm320_decodeirq.c
+ * arch/arm/src/dm320/dm320_decodeirq.c
+ * arch/arm/src/chip/dm320_decodeirq.c
  *
- *   Copyright (C) 2007 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2007, 2009 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -14,7 +15,7 @@
  *    notice, this list of conditions and the following disclaimer in
  *    the documentation and/or other materials provided with the
  *    distribution.
- * 3. Neither the name Gregory Nutt nor the names of its contributors may be
+ * 3. Neither the name NuttX nor the names of its contributors may be
  *    used to endorse or promote products derived from this software
  *    without specific prior written permission.
  *
@@ -43,6 +44,7 @@
 #include <nuttx/arch.h>
 #include <assert.h>
 #include <debug.h>
+
 #include "up_arch.h"
 #include "os_internal.h"
 #include "up_internal.h"
@@ -86,7 +88,7 @@ void up_decodeirq(uint32* regs)
 
       int irq = (irqentry >> 2) - 1;
 
-      /* Verify that the resulting IRQ number is valie */
+      /* Verify that the resulting IRQ number is valid */
 
       if ((unsigned)irq < NR_IRQS)
         {
diff --git a/arch/arm/src/imx/Make.defs b/arch/arm/src/imx/Make.defs
index 60250c47378..b7019260cbc 100644
--- a/arch/arm/src/imx/Make.defs
+++ b/arch/arm/src/imx/Make.defs
@@ -47,7 +47,7 @@ CMN_CSRCS	= up_assert.c up_blocktask.c up_copystate.c up_createstack.c \
 
 CHIP_ASRCS	= imx_lowputc.S
 CHIP_CSRCS	= imx_boot.c imx_gpio.c imx_allocateheap.c imx_irq.c \
-		  imx_serial.c imx_timerisr.c  # imx_decodeirq.c imx_framebuffer.c
+		  imx_serial.c imx_timerisr.c  imx_decodeirq.c #imx_framebuffer.c
 
 ifeq ($(CONFIG_USBDEV),y)
 CHIP_CSRCS	+= imx_usbdev.c
diff --git a/arch/arm/src/imx/imx_aitc.h b/arch/arm/src/imx/imx_aitc.h
index b73e70fa9eb..fdd8a5cf352 100644
--- a/arch/arm/src/imx/imx_aitc.h
+++ b/arch/arm/src/imx/imx_aitc.h
@@ -106,6 +106,12 @@
 
 /* AITC Register Bit Definitions ****************************************************/
 
+
+#define AITC_NIVECSR_NIPRILVL_SHIFT  0  /* Bits 15–0: Priority of highest priority interrupt */
+#define AITC_NIVECSR_NIPRILVL_MASK   (0x0000ffff << AITC_NIVECSR_NIPRILVL_SHIFT);
+#define AITC_NIVECSR_NIVECTOR_SHIFT  16 /* Bits 31–16: Vector index of highest priority interrupt */
+#define AITC_NIVECSR_NIVECTOR_MASK   (0x0000ffff << AITC_NIVECSR_NIVECTOR_SHIFT);
+
 /************************************************************************************
  * Inline Functions
  ************************************************************************************/
diff --git a/arch/arm/src/imx/imx_decodeirq.c b/arch/arm/src/imx/imx_decodeirq.c
new file mode 100644
index 00000000000..f6a38b934ba
--- /dev/null
+++ b/arch/arm/src/imx/imx_decodeirq.c
@@ -0,0 +1,123 @@
+/********************************************************************************
+ * arch/arm/src/imx/imx_decodeirq.c
+ * arch/arm/src/chip/imx_decodeirq.c
+ *
+ *   Copyright (C) 2009 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ********************************************************************************/
+
+/********************************************************************************
+ * Included Files
+ ********************************************************************************/
+
+#include <nuttx/config.h>
+#include <sys/types.h>
+#include <nuttx/irq.h>
+#include <nuttx/arch.h>
+#include <assert.h>
+#include <debug.h>
+
+#include "up_arch.h"
+#include "os_internal.h"
+#include "up_internal.h"
+
+/********************************************************************************
+ * Definitions
+ ********************************************************************************/
+
+/********************************************************************************
+ * Public Data
+ ********************************************************************************/
+
+/********************************************************************************
+ * Private Data
+ ********************************************************************************/
+
+/********************************************************************************
+ * Private Functions
+ ********************************************************************************/
+
+/********************************************************************************
+ * Public Funtions
+ ********************************************************************************/
+
+void up_decodeirq(uint32* regs)
+{
+#ifdef CONFIG_SUPPRESS_INTERRUPTS
+  lib_lowprintf("Unexpected IRQ\n");
+  current_regs = regs;
+  PANIC(OSERR_ERREXCEPTION);
+#else
+  uint32 regval;
+  int    irq;
+
+  /* Decode the interrupt.  First, fetch the NIVECSR register. */
+
+  regval = getreg32(IMX_AITC_NIVECSR);
+
+  /* The MS 16 bits of the NIVECSR register contains vector index for the
+   * highest pending normal interrupt.
+   */
+
+  irq = regval >> AITC_NIVECSR_NIVECTOR_SHIFT;
+
+  /* If irq < 64, then this is the IRQ.  If there is no pending interrupt,
+   * then irq will be >= 64 (it will be 0xffff for illegal source).
+   */
+
+  if (irq < NR_IRQS)
+    {
+      /* Mask and acknowledge the interrupt */
+
+      up_maskack_irq(irq);
+
+      /* Current regs non-zero indicates that we are processing an interrupt;
+       * current_regs is also used to manage interrupt level context switches.
+       */
+
+      current_regs = regs;
+
+      /* Deliver the IRQ */
+
+      irq_dispatch(irq, regs);
+
+      /* Indicate that we are no long in an interrupt handler */
+
+      current_regs = NULL;
+
+      /* Unmask the last interrupt (global interrupts are still
+       * disabled.
+       */
+
+      up_enable_irq(irq);
+    }
+#endif
+}