drivers/mtd/nand/nand-bb.c - barebox/mindspeed - Git at Google

 /*
  * Copyright (c) 2008 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
  *
  * 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 version 2
  * as published by the Free Software Foundation.
  *
  * 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 <command.h>
 #include <fs.h>
 #include <linux/stat.h>
 #include <errno.h>
 #include <malloc.h>
 #include <getopt.h>
 #include <xfuncs.h>
 #include <init.h>
 #include <ioctl.h>
 #include <nand.h>
 #include <linux/mtd/mtd-abi.h>
 #include <fcntl.h>
 #include <libgen.h>
 #include <linux/list.h>

 struct nand_bb {
 	char cdevname[MAX_DRIVER_NAME];
 	struct cdev *cdev_parent;
 	char *name;
 	int open;
 	int needs_write;

 	struct mtd_info_user info;

 	size_t raw_size;
 	size_t size;
 	off_t offset;
 	unsigned long flags;
 	void *writebuf;

 	struct cdev cdev;

 	struct list_head list;
 };

 static ssize_t nand_bb_read(struct cdev *cdev, void *buf, size_t count,
 	unsigned long offset, ulong flags)
 {
 	struct nand_bb *bb = cdev->priv;
 	struct cdev *parent = bb->cdev_parent;
 	int ret, bytes = 0, now;

 	debug("%s %d %d\n", __func__, offset, count);

 	while(count) {
 		ret = cdev_ioctl(parent, MEMGETBADBLOCK, (void *)bb->offset);
 		if (ret < 0)
 			return ret;

 		if (ret) {
 			printf("skipping bad block at 0x%08lx\n", bb->offset);
 			bb->offset += bb->info.erasesize;
 			continue;
 		}

 		now = min(count, (size_t)(bb->info.erasesize -
 				(bb->offset % bb->info.erasesize)));
 		ret = cdev_read(parent, buf, now, bb->offset, 0);
 		if (ret < 0)
 			return ret;
 		buf += now;
 		count -= now;
 		bb->offset += now;
 		bytes += now;
 	};

 	return bytes;
 }

 /* Must be a multiple of the largest NAND page size */
 #define BB_WRITEBUF_SIZE	4096

 #ifdef CONFIG_NAND_WRITE
 static int nand_bb_write_buf(struct nand_bb *bb, size_t count)
 {
 	int ret, now;
 	struct cdev *parent = bb->cdev_parent;
 	void *buf = bb->writebuf;
 	int cur_ofs = bb->offset & ~(BB_WRITEBUF_SIZE - 1);

 	while (count) {
 		ret = cdev_ioctl(parent, MEMGETBADBLOCK, (void *)cur_ofs);
 		if (ret < 0)
 			return ret;

 		if (ret) {
 			debug("skipping bad block at 0x%08x\n", cur_ofs);
 			bb->offset += bb->info.erasesize;
 			cur_ofs += bb->info.erasesize;
 			continue;
 		}

 		now = min(count, (size_t)(bb->info.erasesize));
 		ret = cdev_write(parent, buf, now, cur_ofs, 0);
 		if (ret < 0)
 			return ret;
 		buf += now;
 		count -= now;
 		cur_ofs += now;
 	};

 	return 0;
 }

 static ssize_t nand_bb_write(struct cdev *cdev, const void *buf, size_t count,
 	unsigned long offset, ulong flags)
 {
 	struct nand_bb *bb = cdev->priv;
 	int bytes = count, now, wroffs, ret;

 	debug("%s offset: 0x%08x count: 0x%08x\n", __func__, offset, count);

 	while (count) {
 		wroffs = bb->offset % BB_WRITEBUF_SIZE;
 		now = min((int)count, BB_WRITEBUF_SIZE - wroffs);
 		memcpy(bb->writebuf + wroffs, buf, now);

 		if (wroffs + now == BB_WRITEBUF_SIZE) {
 			bb->needs_write = 0;
 			ret = nand_bb_write_buf(bb, BB_WRITEBUF_SIZE);
 			if (ret)
 				return ret;
 		} else {
 			bb->needs_write = 1;
 		}

 		bb->offset += now;
 		count -= now;
 		buf += now;
 	}

 	return bytes;
 }

 static int nand_bb_erase(struct cdev *cdev, size_t count, unsigned long offset)
 {
 	struct nand_bb *bb = cdev->priv;

 	if (offset != 0) {
 		printf("can only erase from beginning of device\n");
 		return -EINVAL;
 	}

 	return cdev_erase(bb->cdev_parent, bb->raw_size, 0);
 }
 #endif

 static int nand_bb_open(struct cdev *cdev, unsigned long flags)
 {
 	struct nand_bb *bb = cdev->priv;

 	if (bb->open)
 		return -EBUSY;

 	bb->flags = flags;
 	bb->open = 1;
 	bb->offset = 0;
 	bb->needs_write = 0;
 	bb->writebuf = xmalloc(BB_WRITEBUF_SIZE);

 	return 0;
 }

 static int nand_bb_close(struct cdev *cdev)
 {
 	struct nand_bb *bb = cdev->priv;

 #ifdef CONFIG_NAND_WRITE
 	if (bb->needs_write)
 		nand_bb_write_buf(bb, bb->offset % BB_WRITEBUF_SIZE);
 #endif
 	bb->open = 0;
 	free(bb->writebuf);

 	return 0;
 }

 static int nand_bb_calc_size(struct nand_bb *bb)
 {
 	ulong pos = 0;
 	int ret;

 	while (pos < bb->raw_size) {
 		ret = cdev_ioctl(bb->cdev_parent, MEMGETBADBLOCK, (void *)pos);
 		if (ret < 0)
 			return ret;
 		if (!ret)
 			bb->cdev.size += bb->info.erasesize;

 		pos += bb->info.erasesize;
 	}

 	return 0;
 }

 static off_t nand_bb_lseek(struct cdev *cdev, off_t __offset)
 {
 	struct nand_bb *bb = cdev->priv;
 	unsigned long raw_pos = 0;
 	uint32_t offset = __offset;
 	int ret;

 	/* lseek only in readonly mode */
 	if (bb->flags & O_ACCMODE)
 		return -ENOSYS;
 	while (raw_pos < bb->raw_size) {
 		off_t now = min(offset, bb->info.erasesize);

 		ret = cdev_ioctl(bb->cdev_parent, MEMGETBADBLOCK, (void *)raw_pos);
 		if (ret < 0)
 			return ret;
 		if (!ret) {
 			offset -= now;
 			raw_pos += now;
 		} else {
 			raw_pos += bb->info.erasesize;
 		}

 		if (!offset) {
 			bb->offset = raw_pos;
 			return __offset;
 		}
 	}

 	return -EINVAL;
 }

 static struct file_operations nand_bb_ops = {
 	.open   = nand_bb_open,
 	.close  = nand_bb_close,
 	.read  	= nand_bb_read,
 	.lseek	= nand_bb_lseek,
 #ifdef CONFIG_NAND_WRITE
 	.write 	= nand_bb_write,
 	.erase	= nand_bb_erase,
 #endif
 };

 static LIST_HEAD(bb_list);

 /**
  * Add a bad block aware device ontop of another (NAND) device
  * @param[in] dev The device to add a partition on
  * @param[in] name Partition name (can be obtained with devinfo command)
  * @return The device representing the new partition.
  */
 int dev_add_bb_dev(char *path, const char *name)
 {
 	struct nand_bb *bb;
 	int ret = -ENOMEM;

 	bb = xzalloc(sizeof(*bb));

 	bb->cdev_parent = cdev_open(path, O_RDWR);
 	if (!bb->cdev_parent)
 		goto out1;

 	if (name) {
 		strcpy(bb->cdevname, name);
 	} else {
 		strcpy(bb->cdevname, path);
 		strcat(bb->cdevname, ".bb");
 	}

 	bb->cdev.name = bb->cdevname;

 	bb->raw_size = bb->cdev_parent->size;

 	ret = cdev_ioctl(bb->cdev_parent, MEMGETINFO, &bb->info);
 	if (ret)
 		goto out4;

 	nand_bb_calc_size(bb);
 	bb->cdev.ops = &nand_bb_ops;
 	bb->cdev.priv = bb;

 	ret = devfs_create(&bb->cdev);
 	if (ret)
 		goto out4;

 	list_add_tail(&bb->list, &bb_list);

 	return 0;

 out4:
 	cdev_close(bb->cdev_parent);
 out1:
 	free(bb);
 	return ret;
 }

 int dev_remove_bb_dev(const char *name)
 {
 	struct nand_bb *bb;

 	list_for_each_entry(bb, &bb_list, list) {
 		if (!strcmp(bb->cdev.name, name)) {
 			devfs_remove(&bb->cdev);
 			cdev_close(bb->cdev_parent);
 			free(bb);
 			return 0;
 		}
 	}

 	return -ENODEV;
 }
	/*
	* Copyright (c) 2008 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
	*
	* 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 version 2
	* as published by the Free Software Foundation.
	*
	* 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 <command.h>
	#include <fs.h>
	#include <linux/stat.h>
	#include <errno.h>
	#include <malloc.h>
	#include <getopt.h>
	#include <xfuncs.h>
	#include <init.h>
	#include <ioctl.h>
	#include <nand.h>
	#include <linux/mtd/mtd-abi.h>
	#include <fcntl.h>
	#include <libgen.h>
	#include <linux/list.h>

	struct nand_bb {
	char cdevname[MAX_DRIVER_NAME];
	struct cdev *cdev_parent;
	char *name;
	int open;
	int needs_write;

	struct mtd_info_user info;

	size_t raw_size;
	size_t size;
	off_t offset;
	unsigned long flags;
	void *writebuf;

	struct cdev cdev;

	struct list_head list;
	};

	static ssize_t nand_bb_read(struct cdev cdev, void buf, size_t count,
	unsigned long offset, ulong flags)
	{
	struct nand_bb *bb = cdev->priv;
	struct cdev *parent = bb->cdev_parent;
	int ret, bytes = 0, now;

	debug("%s %d %d\n", __func__, offset, count);

	while(count) {
	ret = cdev_ioctl(parent, MEMGETBADBLOCK, (void *)bb->offset);
	if (ret < 0)
	return ret;

	if (ret) {
	printf("skipping bad block at 0x%08lx\n", bb->offset);
	bb->offset += bb->info.erasesize;
	continue;
	}

	now = min(count, (size_t)(bb->info.erasesize -
	(bb->offset % bb->info.erasesize)));
	ret = cdev_read(parent, buf, now, bb->offset, 0);
	if (ret < 0)
	return ret;
	buf += now;
	count -= now;
	bb->offset += now;
	bytes += now;
	};

	return bytes;
	}

	/* Must be a multiple of the largest NAND page size */
	#define BB_WRITEBUF_SIZE 4096

	#ifdef CONFIG_NAND_WRITE
	static int nand_bb_write_buf(struct nand_bb *bb, size_t count)
	{
	int ret, now;
	struct cdev *parent = bb->cdev_parent;
	void *buf = bb->writebuf;
	int cur_ofs = bb->offset & ~(BB_WRITEBUF_SIZE - 1);

	while (count) {
	ret = cdev_ioctl(parent, MEMGETBADBLOCK, (void *)cur_ofs);
	if (ret < 0)
	return ret;

	if (ret) {
	debug("skipping bad block at 0x%08x\n", cur_ofs);
	bb->offset += bb->info.erasesize;
	cur_ofs += bb->info.erasesize;
	continue;
	}

	now = min(count, (size_t)(bb->info.erasesize));
	ret = cdev_write(parent, buf, now, cur_ofs, 0);
	if (ret < 0)
	return ret;
	buf += now;
	count -= now;
	cur_ofs += now;
	};

	return 0;
	}

	static ssize_t nand_bb_write(struct cdev cdev, const void buf, size_t count,
	unsigned long offset, ulong flags)
	{
	struct nand_bb *bb = cdev->priv;
	int bytes = count, now, wroffs, ret;

	debug("%s offset: 0x%08x count: 0x%08x\n", __func__, offset, count);

	while (count) {
	wroffs = bb->offset % BB_WRITEBUF_SIZE;
	now = min((int)count, BB_WRITEBUF_SIZE - wroffs);
	memcpy(bb->writebuf + wroffs, buf, now);

	if (wroffs + now == BB_WRITEBUF_SIZE) {
	bb->needs_write = 0;
	ret = nand_bb_write_buf(bb, BB_WRITEBUF_SIZE);
	if (ret)
	return ret;
	} else {
	bb->needs_write = 1;
	}

	bb->offset += now;
	count -= now;
	buf += now;
	}

	return bytes;
	}

	static int nand_bb_erase(struct cdev *cdev, size_t count, unsigned long offset)
	{
	struct nand_bb *bb = cdev->priv;

	if (offset != 0) {
	printf("can only erase from beginning of device\n");
	return -EINVAL;
	}

	return cdev_erase(bb->cdev_parent, bb->raw_size, 0);
	}
	#endif

	static int nand_bb_open(struct cdev *cdev, unsigned long flags)
	{
	struct nand_bb *bb = cdev->priv;

	if (bb->open)
	return -EBUSY;

	bb->flags = flags;
	bb->open = 1;
	bb->offset = 0;
	bb->needs_write = 0;
	bb->writebuf = xmalloc(BB_WRITEBUF_SIZE);

	return 0;
	}

	static int nand_bb_close(struct cdev *cdev)
	{
	struct nand_bb *bb = cdev->priv;

	#ifdef CONFIG_NAND_WRITE
	if (bb->needs_write)
	nand_bb_write_buf(bb, bb->offset % BB_WRITEBUF_SIZE);
	#endif
	bb->open = 0;
	free(bb->writebuf);

	return 0;
	}

	static int nand_bb_calc_size(struct nand_bb *bb)
	{
	ulong pos = 0;
	int ret;

	while (pos < bb->raw_size) {
	ret = cdev_ioctl(bb->cdev_parent, MEMGETBADBLOCK, (void *)pos);
	if (ret < 0)
	return ret;
	if (!ret)
	bb->cdev.size += bb->info.erasesize;

	pos += bb->info.erasesize;
	}

	return 0;
	}

	static off_t nand_bb_lseek(struct cdev *cdev, off_t __offset)
	{
	struct nand_bb *bb = cdev->priv;
	unsigned long raw_pos = 0;
	uint32_t offset = __offset;
	int ret;

	/* lseek only in readonly mode */
	if (bb->flags & O_ACCMODE)
	return -ENOSYS;
	while (raw_pos < bb->raw_size) {
	off_t now = min(offset, bb->info.erasesize);

	ret = cdev_ioctl(bb->cdev_parent, MEMGETBADBLOCK, (void *)raw_pos);
	if (ret < 0)
	return ret;
	if (!ret) {
	offset -= now;
	raw_pos += now;
	} else {
	raw_pos += bb->info.erasesize;
	}

	if (!offset) {
	bb->offset = raw_pos;
	return __offset;
	}
	}

	return -EINVAL;
	}

	static struct file_operations nand_bb_ops = {
	.open = nand_bb_open,
	.close = nand_bb_close,
	.read = nand_bb_read,
	.lseek = nand_bb_lseek,
	#ifdef CONFIG_NAND_WRITE
	.write = nand_bb_write,
	.erase = nand_bb_erase,
	#endif
	};

	static LIST_HEAD(bb_list);

	/**
	* Add a bad block aware device ontop of another (NAND) device
	* @param[in] dev The device to add a partition on
	* @param[in] name Partition name (can be obtained with devinfo command)
	* @return The device representing the new partition.
	*/
	int dev_add_bb_dev(char path, const char name)
	{
	struct nand_bb *bb;
	int ret = -ENOMEM;

	bb = xzalloc(sizeof(*bb));

	bb->cdev_parent = cdev_open(path, O_RDWR);
	if (!bb->cdev_parent)
	goto out1;

	if (name) {
	strcpy(bb->cdevname, name);
	} else {
	strcpy(bb->cdevname, path);
	strcat(bb->cdevname, ".bb");
	}

	bb->cdev.name = bb->cdevname;

	bb->raw_size = bb->cdev_parent->size;

	ret = cdev_ioctl(bb->cdev_parent, MEMGETINFO, &bb->info);
	if (ret)
	goto out4;

	nand_bb_calc_size(bb);
	bb->cdev.ops = &nand_bb_ops;
	bb->cdev.priv = bb;

	ret = devfs_create(&bb->cdev);
	if (ret)
	goto out4;

	list_add_tail(&bb->list, &bb_list);

	return 0;

	out4:
	cdev_close(bb->cdev_parent);
	out1:
	free(bb);
	return ret;
	}

	int dev_remove_bb_dev(const char *name)
	{
	struct nand_bb *bb;

	list_for_each_entry(bb, &bb_list, list) {
	if (!strcmp(bb->cdev.name, name)) {
	devfs_remove(&bb->cdev);
	cdev_close(bb->cdev_parent);
	free(bb);
	return 0;
	}
	}

	return -ENODEV;
	}