Merge branch 'adm8668'

SVN-Revision: 23900

1 files changed, 126 insertions, 0 deletions

diff --git a/target/linux/adm8668/files/drivers/mtd/maps/adm8668.c b/target/linux/adm8668/files/drivers/mtd/maps/adm8668.c
new file mode 100644
index 0000000000..903decc7b1
--- /dev/null
+++ b/target/linux/adm8668/files/drivers/mtd/maps/adm8668.c
@@ -0,0 +1,126 @@
+/*
+ * Copyright (C) 2010 Scott Nicholas <neutronscott@scottn.us>
+ *
+ * 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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/map.h>
+#include <linux/mtd/partitions.h>
+#include <linux/magic.h>
+#include <asm/io.h>
+
+#define	FLASH_SIZE	0x800000
+#define	FLASH_PHYS_ADDR	0x10000000
+
+/* just interested in part of the full struct */
+struct squashfs_super_block {
+	__le32	s_magic;
+	__le32	pad0[9];	/* it's not really padding */
+	__le64	bytes_used;
+};
+
+static struct mtd_info *mymtd;
+
+static struct map_info nor_map = {
+	name:		"adm8668-nor",
+	size:		FLASH_SIZE,
+	phys:		FLASH_PHYS_ADDR,
+	bankwidth:	2,
+};
+
+static struct mtd_partition nor_parts[] = {
+	{ name: "linux",  offset: 0x40000,  size: FLASH_SIZE - 0x40000, },
+	{ name: "rootfs", offset: 0x200000, size: 0x400000, },
+	{ name: NULL, },
+};
+
+int __init init_mtd_partitions(struct mtd_info *mtd, size_t size)
+{
+	int blocksize, off;
+	size_t len;
+	struct squashfs_super_block hdr;
+
+	blocksize = mtd->erasesize;
+	if (blocksize < 0x10000)
+		blocksize = 0x10000;
+
+	memset(&hdr, 0xe5, sizeof(hdr));
+	/* find and size squashfs */
+	for (off = (128*1024); off < size; off += blocksize) {
+		if (mtd->read(mtd, off, sizeof(hdr), &len, (char *)&hdr) ||
+		    len != sizeof(hdr))
+			continue;
+
+		if (hdr.s_magic == SQUASHFS_MAGIC) {
+			printk(KERN_INFO "%s: Filesystem type: squashfs, off=%#x size=%#x\n",
+				mtd->name, off, (unsigned int)hdr.bytes_used);
+			/* Update the squashfs start address only! */
+			nor_parts[1].offset = off;
+			nor_parts[1].size = FLASH_SIZE - off;
+			return 2;
+		}
+	}
+	return 2;
+}
+
+int __init init_nor(void)
+{
+	int nr_parts;
+
+	printk(KERN_NOTICE "ADM8668 NOR flash device: %#x at %#x\n",
+			FLASH_SIZE, FLASH_PHYS_ADDR);
+
+	nor_map.virt = ioremap(FLASH_PHYS_ADDR,	FLASH_SIZE);
+	if (!nor_map.virt) {
+		printk("Failed to ioremap\n");
+		return -EIO;
+	}
+
+	simple_map_init(&nor_map);
+	mymtd = do_map_probe("cfi_probe", &nor_map);
+	if (!mymtd) {
+		iounmap((void *)nor_map.virt);
+		return -ENXIO;
+	}
+	mymtd->owner = THIS_MODULE;
+	nr_parts = init_mtd_partitions(mymtd, mymtd->size);
+	add_mtd_partitions(mymtd, nor_parts, nr_parts);
+
+	return 0;
+}
+
+static void __exit cleanup_nor(void)
+{
+	if (mymtd) {
+		del_mtd_partitions(mymtd);
+		map_destroy(mymtd);
+	}
+	if (nor_map.virt) {
+		iounmap((void *)nor_map.virt);
+		nor_map.virt = 0;
+	}
+}
+
+module_init(init_nor);
+module_exit(cleanup_nor);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Scott Nicholas <neutronscott@scottn.us>");
+MODULE_DESCRIPTION("MTD map driver for ADM8668 NOR Flash");