adm8668: add 3.18 support

Signed-off-by: Florian Fainelli <florian@openwrt.org>

SVN-Revision: 45094

1 files changed, 334 insertions, 0 deletions

diff --git a/target/linux/adm8668/files-3.18/drivers/mtd/maps/adm8668.c b/target/linux/adm8668/files-3.18/drivers/mtd/maps/adm8668.c
new file mode 100644
index 0000000..8737159
--- /dev/null
+++ b/target/linux/adm8668/files-3.18/drivers/mtd/maps/adm8668.c
@@ -0,0 +1,334 @@
+/*
+ *  Copyright (C) 2010 Scott Nicholas <neutronscott@scottn.us>
+ *  Copyright (C) 2006 Felix Fietkau <nbd@openwrt.org>
+ *  Copyright (C) 2005 Waldemar Brodkorb <wbx@openwrt.org>
+ *  Copyright (C) 2004 Florian Schirmer (jolt@tuxbox.org)
+ *
+ *  original functions for finding root filesystem from Mike Baker
+ *
+ *  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  SOFTWARE  IS PROVIDED   ``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 AUTHOR  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.
+ *
+ *  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.,
+ *  675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ *
+ * Copyright 2004, Broadcom Corporation
+ * All Rights Reserved.
+ *
+ * THIS SOFTWARE IS OFFERED "AS IS", AND BROADCOM GRANTS NO WARRANTIES OF ANY
+ * KIND, EXPRESS OR IMPLIED, BY STATUTE, COMMUNICATION OR OTHERWISE. BROADCOM
+ * SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A SPECIFIC PURPOSE OR NONINFRINGEMENT CONCERNING THIS SOFTWARE.
+ *
+ * Flash mapping for adm8668 boards
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/wait.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/map.h>
+#include <linux/slab.h>
+#include <linux/mtd/partitions.h>
+#include <linux/crc32.h>
+#include <linux/magic.h>
+#include <asm/io.h>
+
+#define WINDOW_ADDR	0x10000000
+#define WINDOW_SIZE	0x800000
+#define BANKWIDTH	2
+
+/* first a little bit about the headers i need.. */
+
+/* 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;
+};
+
+#define IH_MAGIC	0x56190527	/* Image Magic Number		*/
+struct uboot_header {
+	uint32_t	ih_magic;	/* Image Header Magic Number	*/
+	uint32_t	ih_hcrc;	/* Image Header CRC Checksum	*/
+	uint32_t	ih_time;	/* Image Creation Timestamp	*/
+	uint32_t	ih_size;	/* Image Data Size		*/
+	uint32_t	ih_load;	/* Data	 Load  Address		*/
+	uint32_t	ih_ep;		/* Entry Point Address		*/
+	uint32_t	ih_dcrc;	/* Image Data CRC Checksum	*/
+	uint8_t		ih_os;		/* Operating System		*/
+	uint8_t		ih_arch;	/* CPU architecture		*/
+	uint8_t		ih_type;	/* Image Type			*/
+	uint8_t		ih_comp;	/* Compression Type		*/
+	char		ih_name[32];	/* image name */
+};
+
+/************************************************/
+
+static struct mtd_info *adm8668_mtd;
+
+struct map_info adm8668_map = {
+	name: "adm8668-nor",
+	size: WINDOW_SIZE,
+	phys: WINDOW_ADDR,
+	bankwidth: BANKWIDTH,
+};
+
+/*
+ * Copied from mtdblock.c
+ *
+ * Cache stuff...
+ *
+ * Since typical flash erasable sectors are much larger than what Linux's
+ * buffer cache can handle, we must implement read-modify-write on flash
+ * sectors for each block write requests.  To avoid over-erasing flash sectors
+ * and to speed things up, we locally cache a whole flash sector while it is
+ * being written to until a different sector is required.
+ */
+
+static void erase_callback(struct erase_info *done)
+{
+	wait_queue_head_t *wait_q = (wait_queue_head_t *)done->priv;
+	wake_up(wait_q);
+}
+
+static int erase_write (struct mtd_info *mtd, unsigned long pos,
+			int len, const char *buf)
+{
+	struct erase_info erase;
+	DECLARE_WAITQUEUE(wait, current);
+	wait_queue_head_t wait_q;
+	size_t retlen;
+	int ret;
+
+	/*
+	 * First, let's erase the flash block.
+	 */
+
+	init_waitqueue_head(&wait_q);
+	erase.mtd = mtd;
+	erase.callback = erase_callback;
+	erase.addr = pos;
+	erase.len = len;
+	erase.priv = (u_long)&wait_q;
+
+	set_current_state(TASK_INTERRUPTIBLE);
+	add_wait_queue(&wait_q, &wait);
+
+	ret = mtd->_erase(mtd, &erase);
+	if (ret) {
+		set_current_state(TASK_RUNNING);
+		remove_wait_queue(&wait_q, &wait);
+		printk (KERN_WARNING "erase of region [0x%lx, 0x%x] "
+				     "on \"%s\" failed\n",
+			pos, len, mtd->name);
+		return ret;
+	}
+
+	schedule();  /* Wait for erase to finish. */
+	remove_wait_queue(&wait_q, &wait);
+
+	/*
+	 * Next, write data to flash.
+	 */
+
+	ret = mtd->_write (mtd, pos, len, &retlen, buf);
+	if (ret)
+		return ret;
+	if (retlen != len)
+		return -EIO;
+	return 0;
+}
+
+/* decent defaults in case... shrug */
+static struct mtd_partition adm8668_parts[] = {
+	{ name: "linux",	offset: 0x40000,	size: WINDOW_SIZE-0x40000, },
+	{ name: "rootfs",	offset: 0xe0000,	size: 0x140000, },
+	{ name: "uboot_env",	offset: 0x20000,	size: 0x20000, },
+	{ name: NULL, },
+};
+
+/* in case i wanna change stuff later, and to clarify the math section... */
+#define	PART_LINUX	0
+#define	PART_ROOTFS	1
+#define	NR_PARTS	3
+
+static int __init
+init_mtd_partitions(struct mtd_info *mtd, size_t size)
+{
+	struct uboot_header uhdr;
+	int off, blocksize;
+	size_t len, linux_len;
+	struct squashfs_super_block shdr;
+
+	blocksize = mtd->erasesize;
+	if (blocksize < 0x10000)
+		blocksize = 0x10000;
+
+	/* now find squashfs */
+	memset(&shdr, 0xe5, sizeof(shdr));
+	for (off = adm8668_parts[PART_LINUX].offset; off < size; off += blocksize) {
+		/*
+		 * Read into buffer
+		 */
+		if (mtd->_read(mtd, off, sizeof(shdr), &len, (char *)&shdr) ||
+		    len != sizeof(shdr))
+			continue;
+
+		if (shdr.s_magic == SQUASHFS_MAGIC) {
+			uint32_t fs_size = (uint32_t)shdr.bytes_used;
+
+			printk(KERN_INFO "%s: Filesystem type: squashfs, size=%dkB\n",
+				mtd->name, fs_size>>10);
+
+			/* Update rootfs based on the superblock info, and
+			 * stretch to end of MTD. rootfs_split will split it */
+			adm8668_parts[PART_ROOTFS].offset = off;
+			adm8668_parts[PART_ROOTFS].size = mtd->size -
+				adm8668_parts[PART_ROOTFS].offset;
+
+			/* kernel ends where rootfs starts
+			 * but we'll keep it full-length for upgrades */
+			linux_len = adm8668_parts[PART_LINUX+1].offset -
+				adm8668_parts[PART_LINUX].offset;
+#if 1
+			adm8668_parts[PART_LINUX].size = mtd->size -
+				adm8668_parts[PART_LINUX].offset;
+#else
+			adm8668_parts[PART_LINUX].size = linux_len;
+#endif
+			goto found;
+		}
+	}
+
+	printk(KERN_NOTICE
+	       "%s: Couldn't find root filesystem\n",
+	       mtd->name);
+	return NR_PARTS;
+
+ found:
+	if (mtd->_read(mtd, adm8668_parts[PART_LINUX].offset, sizeof(uhdr), &len, (char *)&uhdr) ||
+	    len != sizeof(uhdr))
+		return NR_PARTS;
+
+	/* that's odd. how'd ya boot it then */
+	if (uhdr.ih_magic != IH_MAGIC)
+		return NR_PARTS;
+
+	if (be32_to_cpu(uhdr.ih_size) != (linux_len - sizeof(uhdr))) {
+		unsigned char *block, *data;
+		unsigned int offset;
+
+		offset = adm8668_parts[PART_LINUX].offset +
+			 sizeof(struct uboot_header);
+		data = (unsigned char *)(WINDOW_ADDR | 0xA0000000 | offset);
+
+		printk(KERN_NOTICE "Updating U-boot image:\n");
+		printk(KERN_NOTICE "  old: [size: %8d crc32: 0x%08x]\n",
+			be32_to_cpu(uhdr.ih_size), be32_to_cpu(uhdr.ih_dcrc));
+
+		/* Update the data length & crc32 */
+		uhdr.ih_size = cpu_to_be32(linux_len - sizeof(uhdr));
+		uhdr.ih_dcrc = crc32_le(~0, data, linux_len - sizeof(uhdr)) ^ (~0);
+		uhdr.ih_dcrc = cpu_to_be32(uhdr.ih_dcrc);
+
+		printk(KERN_NOTICE "  new: [size: %8d crc32: 0x%08x]\n",
+			be32_to_cpu(uhdr.ih_size), be32_to_cpu(uhdr.ih_dcrc));
+
+		/* update header's crc... */
+		uhdr.ih_hcrc = 0;
+		uhdr.ih_hcrc = crc32_le(~0, (unsigned char *)&uhdr,
+				sizeof(uhdr)) ^ (~0);
+		uhdr.ih_hcrc = cpu_to_be32(uhdr.ih_hcrc);
+
+		/* read first eraseblock from the image */
+		block = kmalloc(mtd->erasesize, GFP_KERNEL);
+		if (mtd->_read(mtd, adm8668_parts[PART_LINUX].offset, mtd->erasesize, &len, block) || len != mtd->erasesize) {
+			printk("Error copying first eraseblock\n");
+			return 0;
+		}
+
+		/* Write updated header to the flash */
+		memcpy(block, &uhdr, sizeof(uhdr));
+		if (mtd->_unlock)
+			mtd->_unlock(mtd, off, mtd->erasesize);
+		erase_write(mtd, adm8668_parts[PART_LINUX].offset, mtd->erasesize, block);
+		if (mtd->_sync)
+			mtd->_sync(mtd);
+		kfree(block);
+		printk(KERN_NOTICE "Done\n");
+	}
+
+	return NR_PARTS;
+}
+
+int __init init_adm8668_map(void)
+{
+	int nr_parts, ret;
+
+	adm8668_map.virt = ioremap(WINDOW_ADDR, WINDOW_SIZE);
+
+	if (!adm8668_map.virt) {
+		printk(KERN_ERR "Failed to ioremap\n");
+		return -EIO;
+	}
+
+	simple_map_init(&adm8668_map);
+	if (!(adm8668_mtd = do_map_probe("cfi_probe", &adm8668_map))) {
+		printk(KERN_ERR "cfi_probe failed\n");
+		iounmap((void *)adm8668_map.virt);
+		return -ENXIO;
+	}
+
+	adm8668_mtd->owner = THIS_MODULE;
+
+	nr_parts = init_mtd_partitions(adm8668_mtd, adm8668_mtd->size);
+	ret = mtd_device_register(adm8668_mtd, adm8668_parts, nr_parts);
+	if (ret) {
+		printk(KERN_ERR "Flash: mtd_device_register failed\n");
+		goto fail;
+	}
+
+	return 0;
+
+ fail:
+	if (adm8668_mtd)
+		map_destroy(adm8668_mtd);
+	if (adm8668_map.virt)
+		iounmap((void *) adm8668_map.virt);
+	adm8668_map.virt = 0;
+	return ret;
+}
+
+void __exit cleanup_adm8668_map(void)
+{
+	mtd_device_unregister(adm8668_mtd);
+	map_destroy(adm8668_mtd);
+	iounmap((void *) adm8668_map.virt);
+	adm8668_map.virt = 0;
+}
+
+module_init(init_adm8668_map);
+module_exit(cleanup_adm8668_map);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Scott Nicholas <neutronscott@scottn.us>");
+MODULE_DESCRIPTION("MTD map driver for ADM8668 NOR Flash");