1 files changed, 122 insertions, 0 deletions
diff --git a/bsps/arm/lpc32xx/nand/nand-mlc-erase-block-safe.c b/bsps/arm/lpc32xx/nand/nand-mlc-erase-block-safe.c
new file mode 100644
index 0000000000..b7e570e46d
--- /dev/null
+++ b/bsps/arm/lpc32xx/nand/nand-mlc-erase-block-safe.c
@@ -0,0 +1,122 @@
+/**
+ * @file
+ *
+ * @ingroup lpc32xx_nand_mlc
+ *
+ * @brief lpc32xx_mlc_erase_block_safe(), lpc32xx_mlc_erase_block_safe_3(), and
+ * lpc32xx_mlc_zero_block() implementation.
+ */
+
+/*
+ * Copyright (c) 2011 embedded brains GmbH.  All rights reserved.
+ *
+ *  embedded brains GmbH
+ *  Obere Lagerstr. 30
+ *  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.org/license/LICENSE.
+ */
+
+#include <bsp/nand-mlc.h>
+
+#include <string.h>
+
+#include <bsp.h>
+
+void lpc32xx_mlc_zero_pages(uint32_t page_begin, uint32_t page_end)
+{
+  uint32_t page = 0;
+
+  for (page = page_begin; page < page_end; ++page) {
+    lpc32xx_mlc_write_page_with_ecc(
+      page,
+      lpc32xx_magic_zero_begin,
+      lpc32xx_magic_zero_begin
+    );
+  }
+}
+
+static rtems_status_code is_valid_page(
+  uint32_t page_begin,
+  uint32_t page_offset
+)
+{
+  rtems_status_code sc = RTEMS_SUCCESSFUL;
+  uint32_t spare [MLC_LARGE_SPARE_WORD_COUNT];
+
+  memset(spare, 0, MLC_LARGE_SPARE_SIZE);
+
+  sc = lpc32xx_mlc_read_page(
+    page_begin + page_offset,
+    lpc32xx_magic_zero_begin,
+    spare,
+    NULL
+  );
+  if (sc == RTEMS_SUCCESSFUL) {
+    if (lpc32xx_mlc_is_bad_page(spare)) {
+      sc = RTEMS_INCORRECT_STATE;
+    }
+  }
+
+  return sc;
+}
+
+static rtems_status_code is_valid_block(uint32_t page_begin)
+{
+  rtems_status_code sc = RTEMS_SUCCESSFUL;
+
+  if (lpc32xx_mlc_page_size() == 512 && lpc32xx_mlc_io_width() == 8) {
+    sc = is_valid_page(page_begin, 0);
+    if (sc == RTEMS_SUCCESSFUL) {
+      sc = is_valid_page(page_begin, 1);
+    }
+  } else {
+    sc = RTEMS_NOT_IMPLEMENTED;
+  }
+
+  return sc;
+}
+
+rtems_status_code lpc32xx_mlc_is_valid_block(uint32_t block_index)
+{
+  uint32_t pages_per_block = lpc32xx_mlc_pages_per_block();
+  uint32_t page_begin = block_index * pages_per_block;
+
+  return is_valid_block(page_begin);
+}
+
+rtems_status_code lpc32xx_mlc_erase_block_safe_3(
+  uint32_t block_index,
+  uint32_t page_begin,
+  uint32_t page_end
+)
+{
+  rtems_status_code sc = RTEMS_SUCCESSFUL;
+
+  sc = is_valid_block(page_begin);
+  if (sc == RTEMS_SUCCESSFUL) {
+    sc = lpc32xx_mlc_erase_block(block_index);
+    if (sc == RTEMS_UNSATISFIED) {
+      lpc32xx_mlc_zero_pages(page_begin, page_end);
+    }
+  }
+
+  return sc;
+}
+
+rtems_status_code lpc32xx_mlc_erase_block_safe(uint32_t block_index)
+{
+  uint32_t pages_per_block = lpc32xx_mlc_pages_per_block();
+  uint32_t page_begin = block_index * pages_per_block;
+  uint32_t page_end = page_begin + pages_per_block;
+
+  return lpc32xx_mlc_erase_block_safe_3(
+    block_index,
+    page_begin,
+    page_end
+  );
+}