[adm8668] replace the custom mtd driver with a partition parser

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

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@34554 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 130 insertions, 201 deletions

diff --git a/target/linux/adm8668/files/drivers/mtd/maps/adm8668.c b/target/linux/adm8668/files/drivers/mtd/maps/adm8668.c
index e360a0d78c..7ef0adac4b 100644
--- a/target/linux/adm8668/files/drivers/mtd/maps/adm8668.c
+++ b/target/linux/adm8668/files/drivers/mtd/maps/adm8668.c
@@ -1,30 +1,30 @@
 /*
- *  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)
+ * Infineon/ADMTek ADM8668 (WildPass) partition parser support
  *
- *  original functions for finding root filesystem from Mike Baker
+ * Copyright (C) 2010 Scott Nicholas <neutronscott@scottn.us>
+ * Copyright (C) 2012 Florian Fainelli <florian@openwrt.org>
  *
- *  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.
+ * original functions for finding root filesystem from Mike Baker
  *
- *  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.
+ * 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.
  *
- *  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.
+ * 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
@@ -34,9 +34,6 @@
  * 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>
@@ -45,16 +42,13 @@
 #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/vmalloc.h>
+#include <linux/slab.h>
 #include <linux/crc32.h>
 #include <linux/magic.h>
-#include <asm/io.h>
 
-#define WINDOW_ADDR	0x10000000
-#define WINDOW_SIZE	0x800000
-#define BANKWIDTH	2
+#define PFX	"adm8668-part: "
 
 /* first a little bit about the headers i need.. */
 
@@ -81,176 +75,122 @@ struct uboot_header {
 	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 PART_UBOOT_ENV	2
 #define	NR_PARTS	3
 
-static int __init
-init_mtd_partitions(struct mtd_info *mtd, size_t size)
+static int adm8668_parse_partitions(struct mtd_info *master,
+				    struct mtd_partition **pparts,
+				    struct mtd_part_parser_data *data)
 {
+	int ret;
 	struct uboot_header uhdr;
 	int off, blocksize;
 	size_t len, linux_len;
 	struct squashfs_super_block shdr;
+	struct erase_info erase_info;
+	struct mtd_partition *adm8668_parts;
+
+	memset(&erase_info, 0, sizeof(erase_info));
+
+	blocksize = master->erasesize;
 
-	blocksize = mtd->erasesize;
 	if (blocksize < 0x10000)
 		blocksize = 0x10000;
 
+	adm8668_parts = kzalloc(sizeof(*adm8668_parts) * NR_PARTS, GFP_KERNEL);
+	if (!adm8668_parts)
+		return -ENOMEM;
+
+	adm8668_parts[PART_LINUX].name = kstrdup("linux", GFP_KERNEL);
+	adm8668_parts[PART_LINUX].offset = 0x40000;
+	adm8668_parts[PART_LINUX].size = master->size - 0x40000;
+	adm8668_parts[PART_ROOTFS].name = kstrdup("rootfs", GFP_KERNEL);
+	adm8668_parts[PART_ROOTFS].offset = 0xe0000;
+	adm8668_parts[PART_ROOTFS].size = 0x140000;
+	adm8668_parts[PART_UBOOT_ENV].name = kstrdup("uboot_env", GFP_KERNEL);
+	adm8668_parts[PART_UBOOT_ENV].offset = 0x20000;
+	adm8668_parts[PART_UBOOT_ENV].size = 0x20000;
+
 	/* now find squashfs */
 	memset(&shdr, 0xe5, sizeof(shdr));
-	for (off = adm8668_parts[PART_LINUX].offset; off < size; off += blocksize) {
+
+	for (off = 0x40000; off < master->size; off += blocksize) {
 		/*
 		 * Read into buffer
 		 */
-		if (mtd->read(mtd, off, sizeof(shdr), &len, (char *)&shdr) ||
+		if (mtd_read(master, 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);
+			pr_info(PFX "filesystem type: squashfs, size=%dkB\n",
+				fs_size >> 10);
 
-			/* Update rootfs based on the superblock info, and
-			 * stretch to end of MTD. rootfs_split will split it */
+			/*
+			 * 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].size = master->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 -
+			/*
+			 * 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].size = master->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);
+	pr_err(PFX "could't find root filesystem\n");
 	return NR_PARTS;
 
- found:
-	if (mtd->read(mtd, adm8668_parts[PART_LINUX].offset, sizeof(uhdr), &len, (char *)&uhdr) ||
-	    len != sizeof(uhdr))
+found:
+	if (mtd_read(master, adm8668_parts[PART_LINUX].offset, sizeof(uhdr), &len, (char *)&uhdr) ||
+	    len != sizeof(uhdr)) {
+		pr_err(PFX "failed to read u-boot header\n");
 		return NR_PARTS;
+	}
 
-	/* that's odd. how'd ya boot it then */
-	if (uhdr.ih_magic != IH_MAGIC)
+	if (uhdr.ih_magic != IH_MAGIC) {
+		pr_info(PFX "invalid u-boot magic detected?!?!\n");
 		return NR_PARTS;
+	}
 
 	if (be32_to_cpu(uhdr.ih_size) != (linux_len - sizeof(uhdr))) {
-		unsigned char *block, *data;
+		u32 data;
+		size_t data_len = 0;
+		unsigned char *block;
 		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",
+		pr_info(PFX "Updating U-boot image:\n");
+		pr_info(PFX "  old: [size: %8d crc32: 0x%08x]\n",
 			be32_to_cpu(uhdr.ih_size), be32_to_cpu(uhdr.ih_dcrc));
 
+		if (mtd_read(master, offset, sizeof(data), &data_len, (char *)&data)) {
+			pr_err(PFX "failed to read data\n");
+			goto out;
+		}
+
 		/* 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 = crc32_le(~0, (char *)&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",
+		pr_info(PFX "  new: [size: %8d crc32: 0x%08x]\n",
 			be32_to_cpu(uhdr.ih_size), be32_to_cpu(uhdr.ih_dcrc));
 
 		/* update header's crc... */
@@ -260,75 +200,64 @@ init_mtd_partitions(struct mtd_info *mtd, size_t size)
 		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");
+		block = vmalloc(master->erasesize);
+		if (!block)
+			return -ENOMEM;
+
+		if (mtd_read(master, adm8668_parts[PART_LINUX].offset, master->erasesize, &len, block)
+				|| len != master->erasesize) {
+			pr_err(PFX "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");
+		if (master->unlock)
+			master->unlock(master, off, master->erasesize);
+
+		erase_info.mtd = master;
+		erase_info.addr = (uint64_t)adm8668_parts[PART_LINUX].offset;
+		erase_info.len = master->erasesize;
+		ret = mtd_erase(master, &erase_info);
+		if (!ret) {
+			if (mtd_write(master, adm8668_parts[PART_LINUX].offset, master->erasesize,
+					&len, block))
+				pr_err(PFX "write failed");
+		} else
+			pr_err(PFX "erase failed");
+
+		mtd_sync(master);
+out:
+		if (block)
+			vfree(block);
+		pr_info(PFX "done\n");
 	}
 
+	*pparts = adm8668_parts;
+
 	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;
+static struct mtd_part_parser adm8668_parser = {
+	.owner	= THIS_MODULE,
+	.parse_fn = adm8668_parse_partitions,
+	.name = "adm8668part",
+};
 
- fail:
-	if (adm8668_mtd)
-		map_destroy(adm8668_mtd);
-	if (adm8668_map.virt)
-		iounmap((void *) adm8668_map.virt);
-	adm8668_map.virt = 0;
-	return ret;
+static int __init adm8668_parser_init(void)
+{
+	return register_mtd_parser(&adm8668_parser);
 }
 
-void __exit cleanup_adm8668_map(void)
+static void __exit adm8668_parser_exit(void)
 {
-	mtd_device_unregister(adm8668_mtd);
-	map_destroy(adm8668_mtd);
-	iounmap((void *) adm8668_map.virt);
-	adm8668_map.virt = 0;
+	deregister_mtd_parser(&adm8668_parser);
 }
 
-module_init(init_adm8668_map);
-module_exit(cleanup_adm8668_map);
+module_init(adm8668_parser_init);
+module_exit(adm8668_parser_exit);
 
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Scott Nicholas <neutronscott@scottn.us>");
-MODULE_DESCRIPTION("MTD map driver for ADM8668 NOR Flash");
+MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
+MODULE_DESCRIPTION("MTD partition parser for ADM8668");