175 lines
3.9 KiB
C
175 lines
3.9 KiB
C
/*
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* Copyright (c) 2010, The Linux Foundation. All rights reserved.
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* Copyright (C) 2006-2008 Nokia Corporation
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; see the file COPYING. If not, write to the Free Software
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* Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* Erase the given MTD partition.
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*
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*/
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#include <asm/div64.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/err.h>
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#include <linux/mtd/mtd.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#define PRINT_PREF KERN_INFO "mtd_erasepart: "
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static int dev;
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module_param(dev, int, S_IRUGO);
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MODULE_PARM_DESC(dev, "MTD device number to use");
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static struct mtd_info *mtd;
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static unsigned char *bbt;
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static int ebcnt;
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static int erase_eraseblock(int ebnum)
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{
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int err;
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struct erase_info ei;
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loff_t addr = ebnum * mtd->erasesize;
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memset(&ei, 0, sizeof(struct erase_info));
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ei.mtd = mtd;
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ei.addr = addr;
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ei.len = mtd->erasesize;
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err = mtd_erase(mtd, &ei);
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if (err) {
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printk(PRINT_PREF "error %d while erasing EB %d\n", err, ebnum);
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return err;
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}
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if (ei.state == MTD_ERASE_FAILED) {
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printk(PRINT_PREF "some erase error occurred at EB %d\n",
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ebnum);
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return -EIO;
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}
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return 0;
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}
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static int erase_whole_device(void)
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{
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int err;
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unsigned int i;
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printk(PRINT_PREF "erasing whole device\n");
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for (i = 0; i < ebcnt; ++i) {
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if (bbt[i])
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continue;
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err = erase_eraseblock(i);
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if (err)
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return err;
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cond_resched();
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}
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printk(PRINT_PREF "erased %u eraseblocks\n", i);
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return 0;
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}
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static int is_block_bad(int ebnum)
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{
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int ret;
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loff_t addr = ebnum * mtd->erasesize;
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ret = mtd_block_isbad(mtd, addr);
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if (ret)
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printk(PRINT_PREF "block %d is bad\n", ebnum);
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return ret;
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}
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static int scan_for_bad_eraseblocks(void)
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{
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int i, bad = 0;
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bbt = kmalloc(ebcnt, GFP_KERNEL);
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if (!bbt) {
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printk(PRINT_PREF "error: cannot allocate memory\n");
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return -ENOMEM;
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}
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memset(bbt, 0 , ebcnt);
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printk(PRINT_PREF "scanning for bad eraseblocks\n");
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for (i = 0; i < ebcnt; ++i) {
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bbt[i] = is_block_bad(i) ? 1 : 0;
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if (bbt[i])
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bad += 1;
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cond_resched();
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}
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printk(PRINT_PREF "scanned %d eraseblocks, %d are bad\n", i, bad);
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return 0;
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}
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static int __init mtd_erasepart_init(void)
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{
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int err = 0;
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uint64_t tmp;
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printk(KERN_INFO "\n");
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printk(KERN_INFO "=================================================\n");
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printk(PRINT_PREF "MTD device: %d\n", dev);
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mtd = get_mtd_device(NULL, dev);
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if (IS_ERR(mtd)) {
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err = PTR_ERR(mtd);
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printk(PRINT_PREF "error: cannot get MTD device\n");
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return err;
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}
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if (mtd->type != MTD_NANDFLASH) {
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printk(PRINT_PREF "this test requires NAND flash\n");
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err = -ENODEV;
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goto out2;
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}
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tmp = mtd->size;
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do_div(tmp, mtd->erasesize);
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ebcnt = tmp;
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printk(PRINT_PREF "MTD device size %llu, eraseblock size %u, "
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"page size %u, count of eraseblocks %u",
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(unsigned long long)mtd->size, mtd->erasesize,
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mtd->writesize, ebcnt);
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err = scan_for_bad_eraseblocks();
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if (err)
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goto out1;
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printk(PRINT_PREF "Erasing the whole mtd partition\n");
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err = erase_whole_device();
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out1:
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kfree(bbt);
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out2:
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put_mtd_device(mtd);
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if (err)
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printk(PRINT_PREF "error %d occurred\n", err);
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printk(KERN_INFO "=================================================\n");
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return err;
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}
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module_init(mtd_erasepart_init);
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static void __exit mtd_erasepart_exit(void)
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{
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return;
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}
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module_exit(mtd_erasepart_exit);
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MODULE_DESCRIPTION("Erase a given MTD partition");
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MODULE_LICENSE("GPL v2");
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