Add a flash_eraseall() function

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@3918 42af7a65-404d-4744-a932-0658087f49c3

ChangeLog

@@ -2036,3 +2036,8 @@
 	* Scripts/makefiles/documents.  Several adjustments, corrections and
 	  typo fixes so that NuttX will build correctly on FreeBSD using the
 	  ASH shell (submitted by Kurt Lidl).
+	* drivers/mtd/flash_eraseall.c:  Add a callable function that accepts
+	  the path to a block driver and then erases the underlying FLASH memory
+	  (assuming that the block driver is an MTD driver wrapped in the FTL
+	  layer).
+

drivers/mtd/Make.defs

@@ -36,7 +36,7 @@
 
 # Include MTD drivers
 
-CSRCS += ftl.c m25px.c at45db.c ramtron.c rammtd.c
+CSRCS += at45db.c flash_eraseall.c ftl.c m25px.c rammtd.c ramtron.c
 
 # Include MTD driver support
 

drivers/mtd/flash_eraseall.c

@@ -0,0 +1,113 @@
+/****************************************************************************
+ * drivers/mtd/flash_eraseall.c
+ *
+ *   Copyright (C) 2011 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 <errno.h>
+#include <debug.h>
+
+#include <nuttx/fs.h>
+#include <nuttx/ioctl.h>
+#include <nuttx/mtd.h>
+
+/****************************************************************************
+ * Private Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Types
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: flash_eraseall
+ *
+ * Description:
+ *   Call a block driver with the MDIOC_BULKERASE ioctl command.  This will
+ *   cause the MTD driver to erase all of the flash.
+ *
+ ****************************************************************************/
+
+int flash_eraseall(FAR const char *driver)
+{
+  FAR struct inode *inode;
+  FAR const struct block_operations *ops;
+  int ret;
+
+  /* Open the block driver */
+
+  ret = open_blockdriver(driver ,0, &inode);
+  if (ret < 0)
+    {
+      fdbg("ERROR:  Failed to open '%s': %d\n", driver, ret);
+      return ret;
+    }
+
+  /* Get the block operations */
+
+  ops = inode->u.i_bops;
+
+  /* Invoke the block driver ioctl method */
+
+  ret = -EPERM;
+  if (ops->ioctl)
+    {
+      ret = ops->ioctl(inode, MTDIOC_BULKERASE, 0);
+    }
+
+  /* Close the block driver */
+
+  close_blockdriver(inode);
+  return ret;
+}

drivers/mtd/ftl.c

@@ -420,21 +420,46 @@ static int ftl_geometry(FAR struct inode *inode, struct geometry *geometry)
 static int ftl_ioctl(FAR struct inode *inode, int cmd, unsigned long arg)
 {
   struct ftl_struct_s *dev ;
-  int ret = -ENOTTY;
+  int ret;
 
   fvdbg("Entry\n");
-
-  /* Only one ioctl command is supported (and that is just passed on to MTD */
-
   DEBUGASSERT(inode && inode->i_private);
-  if (cmd == BIOC_XIPBASE && arg != 0)
+
+  /* Only one block driver ioctl command is supported by this driver (and
+   * that command is just passed on to the MTD driver in a slightly
+   * different form).
+   */
+
+  if (cmd == BIOC_XIPBASE)
     {
+      /* The argument accompanying the BIOC_XIPBASE should be non-NULL.  If
+       * DEBUG is enabled, we will catch it here instead of in the MTD
+       * driver.
+       */
+
+#ifdef CONFIG_DEBUG
+      if (arg == 0)
+        {
+          fdbg("ERROR: BIOC_XIPBASE argument is NULL\n");
+          return -EINVAL;
+        }
+#endif
+
+      /* Just change the BIOC_XIPBASE command to the MTDIOC_XIPBASE command. */
+
+      cmd = MTDIOC_XIPBASE;
+    }
+
+  /* No other block driver ioctl commmands are not recognized by this
+   * driver.  Other possible MTD driver ioctl commands are passed through
+   * to the MTD driver (unchanged).
+   */
+
   dev = (struct ftl_struct_s *)inode->i_private;
-      ret = MTD_IOCTL(dev->mtd, MTDIOC_XIPBASE, arg);
+  ret = MTD_IOCTL(dev->mtd, cmd, arg);
   if (ret < 0)
     {
-          fdbg("MTD ioctl(MTDIOC_XIPBASE) failed: %d\n", ret);
+      fdbg("ERROR: MTD ioctl(%04x) failed: %d\n", cmd, ret);
-        }
     }
 
   return ret;

include/nuttx/mtd.h

@@ -147,6 +147,17 @@ extern "C" {
 
 EXTERN int ftl_initialize(int minor, FAR struct mtd_dev_s *mtd);
 
+/****************************************************************************
+ * Name: flash_eraseall
+ *
+ * Description:
+ *   Call a block driver with the MDIOC_BULKERASE ioctl command.  This will
+ *   cause the MTD driver to erase all of the flash.
+ *
+ ****************************************************************************/
+
+EXTERN int flash_eraseall(FAR const char *driver);
+
 /****************************************************************************
  * Name: rammtd_initialize
  *