OneNAND Initial Program Loader (IPL) support

[u-boot] / onenand_ipl / onenand_read.c

diff --git a/onenand_ipl/onenand_read.c b/onenand_ipl/onenand_read.c
new file mode 100644 (file)
index 0000000..f553220
--- /dev/null
+++ b/onenand_ipl/onenand_read.c
@@ -0,0 +1,105 @@
+/*
+ * (C) Copyright 2005-2008 Samsung Electronis
+ * Kyungmin Park <kyungmin.park@samsung.com>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+
+#include <asm/io.h>
+#include <asm/string.h>
+
+#include "onenand_ipl.h"
+
+#define onenand_block_address(block)           (block)
+#define onenand_sector_address(page)           (page << 2)
+#define onenand_buffer_address()               ((1 << 3) << 8)
+#define onenand_bufferram_address(block)       (0)
+
+/* read a page with ECC */
+static inline int onenand_read_page(ulong block, ulong page, u_char *buf)
+{
+       unsigned long *base;
+
+#ifndef __HAVE_ARCH_MEMCPY32
+       unsigned int offset, value;
+       unsigned long *p;
+#endif
+
+       onenand_writew(onenand_block_address(block),
+               THIS_ONENAND(ONENAND_REG_START_ADDRESS1));
+
+       onenand_writew(onenand_sector_address(page),
+               THIS_ONENAND(ONENAND_REG_START_ADDRESS8));
+
+       onenand_writew(onenand_buffer_address(),
+               THIS_ONENAND(ONENAND_REG_START_BUFFER));
+
+       onenand_writew(onenand_bufferram_address(block),
+               THIS_ONENAND(ONENAND_REG_START_ADDRESS2));
+
+       onenand_writew(ONENAND_INT_CLEAR, THIS_ONENAND(ONENAND_REG_INTERRUPT));
+
+       onenand_writew(ONENAND_CMD_READ, THIS_ONENAND(ONENAND_REG_COMMAND));
+
+#ifndef __HAVE_ARCH_MEMCPY32
+       p = (unsigned long *) buf;
+#endif
+       base = (unsigned long *) (CFG_ONENAND_BASE + ONENAND_DATARAM);
+
+       while (!(READ_INTERRUPT() & ONENAND_INT_READ))
+               continue;
+
+#ifdef __HAVE_ARCH_MEMCPY32
+       /* 32 bytes boundary memory copy */
+       memcpy32(buf, base, ONENAND_PAGE_SIZE);
+#else
+       for (offset = 0; offset < (ONENAND_PAGE_SIZE >> 2); offset++) {
+               value = *(base + offset);
+               *p++ = value;
+       }
+#endif
+
+       return 0;
+}
+
+#define ONENAND_START_PAGE             1
+#define ONENAND_PAGES_PER_BLOCK                64
+
+/**
+ * onenand_read_block - Read a block data to buf
+ * @return 0 on success
+ */
+int onenand_read_block(unsigned char *buf, ulong block)
+{
+       int page, offset = 0;
+
+       /* NOTE: you must read page from page 1 of block 0 */
+       /* read the block page by page*/
+       for (page = ONENAND_START_PAGE;
+           page < ONENAND_PAGES_PER_BLOCK; page++) {
+
+               onenand_read_page(block, page, buf + offset);
+
+               offset += ONENAND_PAGE_SIZE;
+       }
+
+       return 0;
+}