320 lines
6.4 KiB
C
320 lines
6.4 KiB
C
/*
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* Copyright (c) 2008 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <common.h>
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#include <command.h>
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#include <fs.h>
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#include <linux/stat.h>
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#include <errno.h>
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#include <malloc.h>
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#include <getopt.h>
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#include <xfuncs.h>
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#include <init.h>
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#include <ioctl.h>
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#include <nand.h>
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#include <linux/mtd/mtd-abi.h>
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#include <fcntl.h>
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#include <libgen.h>
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struct nand_bb {
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char *devname;
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char *name;
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int open;
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struct mtd_info_user info;
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size_t raw_size;
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size_t size;
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int fd;
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off_t offset;
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struct cdev cdev;
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};
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static ssize_t nand_bb_read(struct cdev *cdev, void *buf, size_t count,
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unsigned long offset, ulong flags)
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{
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struct nand_bb *bb = cdev->priv;
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int ret, bytes = 0, now;
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debug("%s %d %d\n", __func__, offset, count);
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while(count) {
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ret = ioctl(bb->fd, MEMGETBADBLOCK, (void *)bb->offset);
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if (ret < 0)
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return ret;
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if (ret) {
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printf("skipping bad block at 0x%08x\n", bb->offset);
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bb->offset += bb->info.erasesize;
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}
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now = min(count, (size_t)(bb->info.erasesize -
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(bb->offset % bb->info.erasesize)));
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lseek(bb->fd, bb->offset, SEEK_SET);
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ret = read(bb->fd, buf, now);
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if (ret < 0)
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return ret;
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buf += now;
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count -= now;
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bb->offset += now;
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bytes += now;
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};
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return bytes;
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}
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static ssize_t nand_bb_write(struct cdev *cdev, const void *buf, size_t count,
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unsigned long offset, ulong flags)
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{
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struct nand_bb *bb = cdev->priv;
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int ret, bytes = 0, now;
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debug("%s offset: 0x%08x count: 0x%08x\n", __func__, offset, count);
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while(count) {
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ret = ioctl(bb->fd, MEMGETBADBLOCK, (void *)bb->offset);
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if (ret < 0)
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return ret;
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if (ret) {
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debug("skipping bad block at 0x%08x\n", bb->offset);
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bb->offset += bb->info.erasesize;
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}
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now = min(count, (size_t)(bb->info.erasesize -
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(bb->offset % bb->info.erasesize)));
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lseek(bb->fd, offset, SEEK_SET);
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ret = write(bb->fd, buf, now);
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if (ret < 0)
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return ret;
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buf += now;
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count -= now;
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bb->offset += now;
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bytes += now;
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};
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return bytes;
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}
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static int nand_bb_erase(struct cdev *cdev, size_t count, unsigned long offset)
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{
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struct nand_bb *bb = cdev->priv;
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if (offset != 0 || count != bb->raw_size) {
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printf("can only erase whole device\n");
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return -EINVAL;
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}
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return erase(bb->fd, bb->raw_size, 0);
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}
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static int nand_bb_open(struct cdev *cdev, struct filep *f)
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{
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struct nand_bb *bb = cdev->priv;
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if (bb->open)
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return -EBUSY;
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bb->open = 1;
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bb->offset = 0;
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return 0;
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}
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static int nand_bb_close(struct cdev *cdev, struct filep *f)
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{
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struct nand_bb *bb = cdev->priv;
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bb->open = 0;
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return 0;
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}
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static int nand_bb_calc_size(struct nand_bb *bb)
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{
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ulong pos = 0;
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int ret;
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while (pos < bb->raw_size) {
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ret = ioctl(bb->fd, MEMGETBADBLOCK, (void *)pos);
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if (ret < 0)
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return ret;
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if (!ret)
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bb->cdev.size += bb->info.erasesize;
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pos += bb->info.erasesize;
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}
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return 0;
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}
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static struct file_operations nand_bb_ops = {
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.open = nand_bb_open,
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.close = nand_bb_close,
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.read = nand_bb_read,
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.write = nand_bb_write,
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.erase = nand_bb_erase,
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};
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/**
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* Add a bad block aware device ontop of another (NAND) device
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* @param[in] dev The device to add a partition on
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* @param[in] name Partition name (can be obtained with devinfo command)
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* @return The device representing the new partition.
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*/
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int dev_add_bb_dev(char *path, const char *name)
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{
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struct nand_bb *bb;
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int ret;
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struct stat s;
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bb = xzalloc(sizeof(*bb));
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bb->devname = asprintf("/dev/%s", basename(path));
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if (name)
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bb->cdev.name = strdup(name);
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else
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bb->cdev.name = asprintf("%s.bb", basename(path));
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ret = stat(bb->devname, &s);
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if (ret)
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goto free_out;
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bb->raw_size = s.st_size;
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bb->fd = open(bb->devname, O_RDWR);
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if (bb->fd < 0) {
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ret = -ENODEV;
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goto free_out;
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}
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ret = ioctl(bb->fd, MEMGETINFO, &bb->info);
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if (ret)
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goto free_out;
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nand_bb_calc_size(bb);
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bb->cdev.ops = &nand_bb_ops;
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bb->cdev.priv = bb;
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devfs_create(&bb->cdev);
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return 0;
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free_out:
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free(bb);
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return ret;
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}
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#define NAND_ADD (1 << 0)
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#define NAND_DEL (1 << 1)
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#define NAND_MARKBAD (1 << 2)
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static int do_nand(cmd_tbl_t *cmdtp, int argc, char *argv[])
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{
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int opt;
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struct device_d *dev;
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struct nand_bb *bb;
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int command = 0, badblock = 0;
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getopt_reset();
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while((opt = getopt(argc, argv, "adb:")) > 0) {
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if (command) {
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printf("only one command may be given\n");
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return 1;
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}
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switch (opt) {
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case 'a':
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command = NAND_ADD;
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break;
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case 'd':
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command = NAND_DEL;
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break;
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case 'b':
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command = NAND_MARKBAD;
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badblock = simple_strtoul(optarg, NULL, 0);
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}
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}
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if (command & NAND_ADD) {
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while (optind < argc) {
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if (dev_add_bb_dev(argv[optind], NULL))
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return 1;
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optind++;
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}
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}
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if (command & NAND_DEL) {
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while (optind < argc) {
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struct cdev *cdev;
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cdev = cdev_by_name(basename(argv[optind]));
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if (!cdev) {
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printf("no such device: %s\n", argv[optind]);
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return 1;
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}
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dev = cdev->dev;
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bb = dev->priv;
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close(bb->fd);
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unregister_device(dev);
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free(bb);
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optind++;
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}
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}
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if (command & NAND_MARKBAD) {
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if (optind < argc) {
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int ret = 0, fd;
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printf("marking block at 0x%08x on %s as bad\n", badblock, argv[optind]);
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fd = open(argv[optind], O_RDWR);
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if (fd < 0) {
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perror("open");
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return 1;
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}
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ret = ioctl(fd, MEMSETBADBLOCK, (void *)badblock);
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if (ret)
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perror("ioctl");
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close(fd);
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return ret;
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}
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}
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return 0;
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}
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static const __maybe_unused char cmd_nand_help[] =
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"Usage: nand [OPTION]...\n"
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"nand related commands\n"
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" -a <dev> register a bad block aware device ontop of a normal nand device\n"
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" -d <dev> deregister a bad block aware device\n"
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" -b <ofs> <dev> mark block at offset ofs as bad\n";
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U_BOOT_CMD_START(nand)
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.maxargs = CONFIG_MAXARGS,
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.cmd = do_nand,
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.usage = "",
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U_BOOT_CMD_HELP(cmd_nand_help)
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U_BOOT_CMD_END
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