With CONFIG_PARTITION_NEED_MTD enabled we use mtd rather than devfs
directly to create partitions on mtd devices. Since:
| commit b32cd8df87
| Author: Sascha Hauer <s.hauer@pengutronix.de>
| Date: Wed Apr 9 15:49:32 2014 +0200
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| mtd: nand: bb: use mtd api directly
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| The devfs layer just adds an addition indirection between mtd
| and the bb devices with no purpose. Drop it.
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| Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
The bad block aware device creation doesn't work if this option
is disabled. With this we remove CONFIG_PARTITION_NEED_MTD and always
use mtd partitions on mtd devices.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
399 lines
8.2 KiB
C
399 lines
8.2 KiB
C
/*
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* devfs.c - a device file system for barebox
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*
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* Copyright (c) 2011 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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*/
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#include <common.h>
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#include <complete.h>
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#include <driver.h>
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#include <errno.h>
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#include <malloc.h>
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#include <ioctl.h>
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#include <nand.h>
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#include <linux/err.h>
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#include <linux/mtd/mtd.h>
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LIST_HEAD(cdev_list);
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#ifdef CONFIG_AUTO_COMPLETE
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int devfs_partition_complete(struct string_list *sl, char *instr)
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{
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struct cdev *cdev;
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int len;
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len = strlen(instr);
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list_for_each_entry(cdev, &cdev_list, list) {
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if (cdev->flags & DEVFS_IS_PARTITION &&
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!strncmp(instr, cdev->name, len)) {
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string_list_add_asprintf(sl, "%s ", cdev->name);
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}
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}
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return COMPLETE_CONTINUE;
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}
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#endif
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struct cdev *cdev_by_name(const char *filename)
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{
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struct cdev *cdev;
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list_for_each_entry(cdev, &cdev_list, list) {
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if (!strcmp(cdev->name, filename))
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return cdev;
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}
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return NULL;
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}
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/**
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* device_find_partition - find a partition belonging to a physical device
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*
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* @dev: the device which should be searched for partitions
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* @name: the partition name
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*/
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struct cdev *device_find_partition(struct device_d *dev, const char *name)
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{
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struct cdev *cdev;
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struct device_d *child;
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list_for_each_entry(cdev, &dev->cdevs, devices_list) {
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if (!cdev->partname)
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continue;
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if (!strcmp(cdev->partname, name))
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return cdev;
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}
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device_for_each_child(dev, child) {
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cdev = device_find_partition(child, name);
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if (cdev)
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return cdev;
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}
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return NULL;
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}
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int cdev_find_free_index(const char *basename)
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{
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int i;
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char fname[100];
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for (i = 0; i < 1000; i++) {
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snprintf(fname, sizeof(fname), "%s%d", basename, i);
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if (cdev_by_name(fname) == NULL)
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return i;
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}
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return -EBUSY; /* all indexes are used */
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}
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int cdev_do_open(struct cdev *cdev, unsigned long flags)
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{
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if (cdev->ops->open)
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return cdev->ops->open(cdev, flags);
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return 0;
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}
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struct cdev *cdev_open(const char *name, unsigned long flags)
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{
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struct cdev *cdev = cdev_by_name(name);
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int ret;
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if (!cdev)
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return NULL;
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ret = cdev_do_open(cdev, flags);
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if (ret)
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return NULL;
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return cdev;
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}
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void cdev_close(struct cdev *cdev)
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{
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if (cdev->ops->close)
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cdev->ops->close(cdev);
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}
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ssize_t cdev_read(struct cdev *cdev, void *buf, size_t count, loff_t offset, ulong flags)
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{
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if (!cdev->ops->read)
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return -ENOSYS;
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return cdev->ops->read(cdev, buf, count, cdev->offset +offset, flags);
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}
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ssize_t cdev_write(struct cdev *cdev, const void *buf, size_t count, loff_t offset, ulong flags)
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{
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if (!cdev->ops->write)
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return -ENOSYS;
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return cdev->ops->write(cdev, buf, count, cdev->offset + offset, flags);
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}
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int cdev_flush(struct cdev *cdev)
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{
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if (!cdev->ops->flush)
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return 0;
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return cdev->ops->flush(cdev);
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}
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static int partition_ioctl(struct cdev *cdev, int request, void *buf)
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{
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int ret = 0;
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loff_t offset, *_buf = buf;
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struct mtd_info_user *user = buf;
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switch (request) {
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case MEMSETBADBLOCK:
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case MEMGETBADBLOCK:
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offset = *_buf;
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offset += cdev->offset;
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ret = cdev->ops->ioctl(cdev, request, &offset);
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break;
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case MEMGETINFO:
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if (cdev->mtd) {
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user->type = cdev->mtd->type;
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user->flags = cdev->mtd->flags;
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user->size = cdev->mtd->size;
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user->erasesize = cdev->mtd->erasesize;
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user->writesize = cdev->mtd->writesize;
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user->oobsize = cdev->mtd->oobsize;
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user->subpagesize = cdev->mtd->writesize >> cdev->mtd->subpage_sft;
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user->mtd = cdev->mtd;
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/* The below fields are obsolete */
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user->ecctype = -1;
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user->eccsize = 0;
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break;
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}
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if (!cdev->ops->ioctl) {
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ret = -EINVAL;
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break;
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}
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ret = cdev->ops->ioctl(cdev, request, buf);
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break;
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#if (defined(CONFIG_NAND_ECC_HW) || defined(CONFIG_NAND_ECC_SOFT))
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case ECCGETSTATS:
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#endif
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case MEMERASE:
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if (!cdev->ops->ioctl) {
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ret = -EINVAL;
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break;
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}
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ret = cdev->ops->ioctl(cdev, request, buf);
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break;
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#ifdef CONFIG_PARTITION
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case MEMGETREGIONINFO:
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if (cdev->mtd) {
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struct region_info_user *reg = buf;
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int erasesize_shift = ffs(cdev->mtd->erasesize) - 1;
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reg->offset = cdev->offset;
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reg->erasesize = cdev->mtd->erasesize;
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reg->numblocks = cdev->size >> erasesize_shift;
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reg->regionindex = cdev->mtd->index;
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}
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break;
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#endif
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default:
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ret = -EINVAL;
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}
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return ret;
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}
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int cdev_ioctl(struct cdev *cdev, int request, void *buf)
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{
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if (cdev->flags & DEVFS_IS_PARTITION)
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return partition_ioctl(cdev, request, buf);
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if (!cdev->ops->ioctl)
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return -EINVAL;
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return cdev->ops->ioctl(cdev, request, buf);
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}
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int cdev_erase(struct cdev *cdev, size_t count, loff_t offset)
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{
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if (!cdev->ops->erase)
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return -ENOSYS;
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return cdev->ops->erase(cdev, count, cdev->offset + offset);
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}
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int devfs_create(struct cdev *new)
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{
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struct cdev *cdev;
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cdev = cdev_by_name(new->name);
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if (cdev)
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return -EEXIST;
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list_add_tail(&new->list, &cdev_list);
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if (new->dev)
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list_add_tail(&new->devices_list, &new->dev->cdevs);
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return 0;
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}
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int devfs_remove(struct cdev *cdev)
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{
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if (cdev->open)
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return -EBUSY;
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list_del(&cdev->list);
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if (cdev->dev)
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list_del(&cdev->devices_list);
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return 0;
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}
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static struct cdev *__devfs_add_partition(struct cdev *cdev,
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const struct devfs_partition *partinfo, loff_t *end)
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{
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loff_t offset, size;
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static struct cdev *new;
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if (cdev_by_name(partinfo->name))
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return ERR_PTR(-EEXIST);
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if (partinfo->offset > 0)
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offset = partinfo->offset;
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else if (partinfo->offset == 0)
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/* append to previous partition */
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offset = *end;
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else
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/* relative to end of cdev */
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offset = cdev->size + partinfo->offset;
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if (partinfo->size > 0)
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size = partinfo->size;
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else
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size = cdev->size + partinfo->size - offset;
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if (offset >= 0 && offset < *end)
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pr_debug("partition %s not after previous partition\n",
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partinfo->name);
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*end = offset + size;
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if (offset < 0 || *end > cdev->size) {
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pr_warn("partition %s not completely inside device %s\n",
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partinfo->name, cdev->name);
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return ERR_PTR(-EINVAL);
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}
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if (IS_ENABLED(CONFIG_MTD) && cdev->mtd) {
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struct mtd_info *mtd;
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mtd = mtd_add_partition(cdev->mtd, offset, size,
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partinfo->flags, partinfo->name);
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if (IS_ERR(mtd))
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return (void *)mtd;
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return &mtd->cdev;
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}
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new = xzalloc(sizeof(*new));
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new->name = strdup(partinfo->name);
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if (!strncmp(cdev->name, partinfo->name, strlen(cdev->name)))
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new->partname = xstrdup(partinfo->name + strlen(cdev->name) + 1);
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new->ops = cdev->ops;
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new->priv = cdev->priv;
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new->size = size;
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new->offset = cdev->offset + offset;
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new->dev = cdev->dev;
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new->flags = partinfo->flags | DEVFS_IS_PARTITION;
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devfs_create(new);
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return new;
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}
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struct cdev *devfs_add_partition(const char *devname, loff_t offset,
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loff_t size, unsigned int flags, const char *name)
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{
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struct cdev *cdev;
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loff_t end = 0;
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const struct devfs_partition partinfo = {
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.offset = offset,
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.size = size,
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.flags = flags,
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.name = name,
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};
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cdev = cdev_by_name(devname);
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if (!cdev)
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return ERR_PTR(-ENOENT);
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return __devfs_add_partition(cdev, &partinfo, &end);
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}
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int devfs_del_partition(const char *name)
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{
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struct cdev *cdev;
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int ret;
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cdev = cdev_by_name(name);
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if (!cdev)
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return -ENOENT;
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if (IS_ENABLED(CONFIG_MTD) && cdev->mtd) {
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ret = mtd_del_partition(cdev->mtd);
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return ret;
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}
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if (!(cdev->flags & DEVFS_IS_PARTITION))
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return -EINVAL;
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if (cdev->flags & DEVFS_PARTITION_FIXED)
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return -EPERM;
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ret = devfs_remove(cdev);
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if (ret)
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return ret;
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free(cdev->name);
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free(cdev->partname);
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free(cdev);
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return 0;
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}
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int devfs_create_partitions(const char *devname,
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const struct devfs_partition partinfo[])
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{
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loff_t offset = 0;
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struct cdev *cdev;
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cdev = cdev_by_name(devname);
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if (!cdev)
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return -ENOENT;
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for (; partinfo->name; ++partinfo) {
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struct cdev *new;
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new = __devfs_add_partition(cdev, partinfo, &offset);
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if (IS_ERR(new))
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return PTR_ERR(new);
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if (partinfo->bbname)
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dev_add_bb_dev(partinfo->name, partinfo->bbname);
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}
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return 0;
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}
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