/*
   * Unsorted Block Image commands
   *
   *  Copyright (C) 2008 Samsung Electronics
   *  Kyungmin Park <kyungmin.park@samsung.com>
   *

   * Copyright 2008-2009 Stefan Roese <sr@denx.de>, DENX Software Engineering

   *
   * 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.
   */
  
  #include <common.h>
  #include <command.h>

  #include <env.h>

  #include <exports.h>

  #include <malloc.h>

  #include <memalign.h>

  #include <mtd.h>

  #include <nand.h>
  #include <onenand_uboot.h>

  #include <dm/devres.h>

  #include <linux/mtd/mtd.h>
  #include <linux/mtd/partitions.h>

  #include <linux/err.h>

  #include <ubi_uboot.h>

  #include <linux/errno.h>

  #include <jffs2/load_kernel.h>

  #undef ubi_msg
  #define ubi_msg(fmt, ...) printf("UBI: " fmt "
  ", ##__VA_ARGS__)

  /* Private own data */
  static struct ubi_device *ubi;

  #ifdef CONFIG_CMD_UBIFS

  #include <ubifs_uboot.h>

  #endif

  static void display_volume_info(struct ubi_device *ubi)
  {
  	int i;
  
  	for (i = 0; i < (ubi->vtbl_slots + 1); i++) {
  		if (!ubi->volumes[i])
  			continue;	/* Empty record */
  		ubi_dump_vol_info(ubi->volumes[i]);
  	}
  }
  
  static void display_ubi_info(struct ubi_device *ubi)
  {
  	ubi_msg("MTD device name:            \"%s\"", ubi->mtd->name);
  	ubi_msg("MTD device size:            %llu MiB", ubi->flash_size >> 20);
  	ubi_msg("physical eraseblock size:   %d bytes (%d KiB)",
  			ubi->peb_size, ubi->peb_size >> 10);
  	ubi_msg("logical eraseblock size:    %d bytes", ubi->leb_size);
  	ubi_msg("number of good PEBs:        %d", ubi->good_peb_count);
  	ubi_msg("number of bad PEBs:         %d", ubi->bad_peb_count);
  	ubi_msg("smallest flash I/O unit:    %d", ubi->min_io_size);
  	ubi_msg("VID header offset:          %d (aligned %d)",
  			ubi->vid_hdr_offset, ubi->vid_hdr_aloffset);
  	ubi_msg("data offset:                %d", ubi->leb_start);
  	ubi_msg("max. allowed volumes:       %d", ubi->vtbl_slots);
  	ubi_msg("wear-leveling threshold:    %d", CONFIG_MTD_UBI_WL_THRESHOLD);
  	ubi_msg("number of internal volumes: %d", UBI_INT_VOL_COUNT);
  	ubi_msg("number of user volumes:     %d",
  			ubi->vol_count - UBI_INT_VOL_COUNT);
  	ubi_msg("available PEBs:             %d", ubi->avail_pebs);
  	ubi_msg("total number of reserved PEBs: %d", ubi->rsvd_pebs);
  	ubi_msg("number of PEBs reserved for bad PEB handling: %d",
  			ubi->beb_rsvd_pebs);
  	ubi_msg("max/mean erase counter: %d/%d", ubi->max_ec, ubi->mean_ec);
  }
  
  static int ubi_info(int layout)
  {
  	if (layout)
  		display_volume_info(ubi);
  	else
  		display_ubi_info(ubi);
  
  	return 0;
  }

  static int ubi_check_volumename(const struct ubi_volume *vol, char *name)
  {
  	return strcmp(vol->name, name);
  }
  
  static int ubi_check(char *name)
  {
  	int i;
  
  	for (i = 0; i < (ubi->vtbl_slots + 1); i++) {
  		if (!ubi->volumes[i])
  			continue;	/* Empty record */
  
  		if (!ubi_check_volumename(ubi->volumes[i], name))
  			return 0;
  	}

  	return 1;

  }

  static int verify_mkvol_req(const struct ubi_device *ubi,
  			    const struct ubi_mkvol_req *req)
  {

  	int n, err = EINVAL;

  
  	if (req->bytes < 0 || req->alignment < 0 || req->vol_type < 0 ||
  	    req->name_len < 0)
  		goto bad;
  
  	if ((req->vol_id < 0 || req->vol_id >= ubi->vtbl_slots) &&
  	    req->vol_id != UBI_VOL_NUM_AUTO)
  		goto bad;
  
  	if (req->alignment == 0)
  		goto bad;

  	if (req->bytes == 0) {
  		printf("No space left in UBI device!
  ");
  		err = ENOMEM;

  		goto bad;

  	}

  
  	if (req->vol_type != UBI_DYNAMIC_VOLUME &&
  	    req->vol_type != UBI_STATIC_VOLUME)
  		goto bad;
  
  	if (req->alignment > ubi->leb_size)
  		goto bad;
  
  	n = req->alignment % ubi->min_io_size;
  	if (req->alignment != 1 && n)
  		goto bad;
  
  	if (req->name_len > UBI_VOL_NAME_MAX) {

  		printf("Name too long!
  ");
  		err = ENAMETOOLONG;

  		goto bad;
  	}
  
  	return 0;
  bad:

  	return err;
  }

  static int ubi_create_vol(char *volume, int64_t size, int dynamic, int vol_id,
  			  bool skipcheck)

  {
  	struct ubi_mkvol_req req;
  	int err;
  
  	if (dynamic)
  		req.vol_type = UBI_DYNAMIC_VOLUME;
  	else
  		req.vol_type = UBI_STATIC_VOLUME;

  	req.vol_id = vol_id;

  	req.alignment = 1;
  	req.bytes = size;
  
  	strcpy(req.name, volume);
  	req.name_len = strlen(volume);
  	req.name[req.name_len] = '\0';

  	req.flags = 0;
  	if (skipcheck)
  		req.flags |= UBI_VOL_SKIP_CRC_CHECK_FLG;

  	/* It's duplicated at drivers/mtd/ubi/cdev.c */
  	err = verify_mkvol_req(ubi, &req);
  	if (err) {
  		printf("verify_mkvol_req failed %d
  ", err);
  		return err;
  	}

  	printf("Creating %s volume %s of size %lld
  ",

  		dynamic ? "dynamic" : "static", volume, size);
  	/* Call real ubi create volume */
  	return ubi_create_volume(ubi, &req);
  }

  static struct ubi_volume *ubi_find_volume(char *volume)

  {

  	struct ubi_volume *vol = NULL;

  	int i;

  
  	for (i = 0; i < ubi->vtbl_slots; i++) {
  		vol = ubi->volumes[i];

  		if (vol && !strcmp(vol->name, volume))
  			return vol;

  	}

  
  	printf("Volume %s not found!
  ", volume);
  	return NULL;
  }
  
  static int ubi_remove_vol(char *volume)
  {
  	int err, reserved_pebs, i;
  	struct ubi_volume *vol;
  
  	vol = ubi_find_volume(volume);
  	if (vol == NULL)
  		return ENODEV;
  
  	printf("Remove UBI volume %s (id %d)
  ", vol->name, vol->vol_id);

  
  	if (ubi->ro_mode) {
  		printf("It's read-only mode
  ");

  		err = EROFS;

  		goto out_err;
  	}

  	err = ubi_change_vtbl_record(ubi, vol->vol_id, NULL);

  	if (err) {
  		printf("Error changing Vol tabel record err=%x
  ", err);
  		goto out_err;
  	}
  	reserved_pebs = vol->reserved_pebs;
  	for (i = 0; i < vol->reserved_pebs; i++) {
  		err = ubi_eba_unmap_leb(ubi, vol, i);
  		if (err)
  			goto out_err;
  	}
  
  	kfree(vol->eba_tbl);

  	ubi->volumes[vol->vol_id]->eba_tbl = NULL;
  	ubi->volumes[vol->vol_id] = NULL;

  
  	ubi->rsvd_pebs -= reserved_pebs;
  	ubi->avail_pebs += reserved_pebs;
  	i = ubi->beb_rsvd_level - ubi->beb_rsvd_pebs;
  	if (i > 0) {
  		i = ubi->avail_pebs >= i ? i : ubi->avail_pebs;
  		ubi->avail_pebs -= i;
  		ubi->rsvd_pebs += i;
  		ubi->beb_rsvd_pebs += i;
  		if (i > 0)
  			ubi_msg("reserve more %d PEBs", i);
  	}
  	ubi->vol_count -= 1;
  
  	return 0;
  out_err:

  	ubi_err(ubi, "cannot remove volume %s, error %d", volume, err);

  	if (err < 0)
  		err = -err;

  	return err;
  }

  static int ubi_volume_continue_write(char *volume, void *buf, size_t size)

  {

  	int err = 1;

  	struct ubi_volume *vol;

  	vol = ubi_find_volume(volume);
  	if (vol == NULL)
  		return ENODEV;

  	err = ubi_more_update_data(ubi, vol, buf, size);
  	if (err < 0) {

  		printf("Couldnt or partially wrote data
  ");
  		return -err;

  	}
  
  	if (err) {
  		size = err;
  
  		err = ubi_check_volume(ubi, vol->vol_id);

  		if (err < 0)
  			return -err;

  
  		if (err) {

  			ubi_warn(ubi, "volume %d on UBI device %d is corrupt",
  				 vol->vol_id, ubi->ubi_num);

  			vol->corrupted = 1;
  		}
  
  		vol->checked = 1;
  		ubi_gluebi_updated(vol);
  	}
  
  	return 0;
  }

  int ubi_volume_begin_write(char *volume, void *buf, size_t size,
  	size_t full_size)
  {
  	int err = 1;
  	int rsvd_bytes = 0;
  	struct ubi_volume *vol;
  
  	vol = ubi_find_volume(volume);
  	if (vol == NULL)
  		return ENODEV;
  
  	rsvd_bytes = vol->reserved_pebs * (ubi->leb_size - vol->data_pad);

  	if (size > rsvd_bytes) {

  		printf("size > volume size! Aborting!
  ");
  		return EINVAL;
  	}
  
  	err = ubi_start_update(ubi, vol, full_size);
  	if (err < 0) {
  		printf("Cannot start volume update
  ");
  		return -err;
  	}
  
  	return ubi_volume_continue_write(volume, buf, size);
  }
  
  int ubi_volume_write(char *volume, void *buf, size_t size)
  {
  	return ubi_volume_begin_write(volume, buf, size, size);
  }

  int ubi_volume_read(char *volume, char *buf, size_t size)

  {

  	int err, lnum, off, len, tbuf_size;

  	void *tbuf;
  	unsigned long long tmp;

  	struct ubi_volume *vol;

  	loff_t offp = 0;

  	size_t len_read;

  	vol = ubi_find_volume(volume);
  	if (vol == NULL)
  		return ENODEV;

  	if (vol->updating) {
  		printf("updating");

  		return EBUSY;

  	}
  	if (vol->upd_marker) {
  		printf("damaged volume, update marker is set");

  		return EBADF;

  	}
  	if (offp == vol->used_bytes)
  		return 0;
  
  	if (size == 0) {

  		printf("No size specified -> Using max size (%lld)
  ", vol->used_bytes);

  		size = vol->used_bytes;
  	}

  	printf("Read %zu bytes from volume %s to %p
  ", size, volume, buf);

  	if (vol->corrupted)
  		printf("read from corrupted volume %d", vol->vol_id);
  	if (offp + size > vol->used_bytes)

  		size = vol->used_bytes - offp;

  
  	tbuf_size = vol->usable_leb_size;
  	if (size < tbuf_size)
  		tbuf_size = ALIGN(size, ubi->min_io_size);

  	tbuf = malloc_cache_aligned(tbuf_size);

  	if (!tbuf) {
  		printf("NO MEM
  ");

  		return ENOMEM;

  	}
  	len = size > tbuf_size ? tbuf_size : size;
  
  	tmp = offp;
  	off = do_div(tmp, vol->usable_leb_size);
  	lnum = tmp;

  	len_read = size;

  	do {
  		if (off + len >= vol->usable_leb_size)
  			len = vol->usable_leb_size - off;
  
  		err = ubi_eba_read_leb(ubi, vol, lnum, tbuf, off, len, 0);
  		if (err) {
  			printf("read err %x
  ", err);

  			err = -err;

  			break;
  		}
  		off += len;
  		if (off == vol->usable_leb_size) {
  			lnum += 1;
  			off -= vol->usable_leb_size;
  		}
  
  		size -= len;
  		offp += len;

  		memcpy(buf, tbuf, len);

  
  		buf += len;
  		len = size > tbuf_size ? tbuf_size : size;
  	} while (size);

  	if (!size)
  		env_set_hex("filesize", len_read);

  	free(tbuf);

  	return err;

  }

  static int ubi_dev_scan(struct mtd_info *info, const char *vid_header_offset)

  {

  	char ubi_mtd_param_buffer[80];

  	int err;

  	if (!vid_header_offset)
  		sprintf(ubi_mtd_param_buffer, "%s", info->name);
  	else
  		sprintf(ubi_mtd_param_buffer, "%s,%s", info->name,
  			vid_header_offset);

  	err = ubi_mtd_param_parse(ubi_mtd_param_buffer, NULL);

  	if (err)

  		return -err;

  
  	err = ubi_init();

  	if (err)

  		return -err;

  	return 0;
  }

  static int ubi_set_skip_check(char *volume, bool skip_check)
  {
  	struct ubi_vtbl_record vtbl_rec;
  	struct ubi_volume *vol;
  
  	vol = ubi_find_volume(volume);
  	if (!vol)
  		return ENODEV;
  
  	printf("%sing skip_check on volume %s
  ",
  	       skip_check ? "Sett" : "Clear", volume);
  
  	vtbl_rec = ubi->vtbl[vol->vol_id];
  	if (skip_check) {
  		vtbl_rec.flags |= UBI_VTBL_SKIP_CRC_CHECK_FLG;
  		vol->skip_check = 1;
  	} else {
  		vtbl_rec.flags &= ~UBI_VTBL_SKIP_CRC_CHECK_FLG;
  		vol->skip_check = 0;
  	}
  
  	return ubi_change_vtbl_record(ubi, vol->vol_id, &vtbl_rec);
  }

  static int ubi_detach(void)

  {

  #ifdef CONFIG_CMD_UBIFS
  	/*
  	 * Automatically unmount UBIFS partition when user
  	 * changes the UBI device. Otherwise the following
  	 * UBIFS commands will crash.
  	 */
  	if (ubifs_is_mounted())
  		cmd_ubifs_umount();
  #endif

  	/*
  	 * Call ubi_exit() before re-initializing the UBI subsystem
  	 */

  	if (ubi)

  		ubi_exit();

  	ubi = NULL;

  	return 0;
  }
  
  int ubi_part(char *part_name, const char *vid_header_offset)
  {

  	struct mtd_info *mtd;

  	int err = 0;

  
  	ubi_detach();

  
  	mtd_probe_devices();
  	mtd = get_mtd_device_nm(part_name);
  	if (IS_ERR(mtd)) {

  		printf("Partition %s not found!
  ", part_name);
  		return 1;
  	}

  	put_mtd_device(mtd);

  	err = ubi_dev_scan(mtd, vid_header_offset);

  	if (err) {
  		printf("UBI init error %d
  ", err);

  		printf("Please check, if the correct MTD partition is used (size big enough?)
  ");

  		return err;
  	}
  
  	ubi = ubi_devices[0];
  
  	return 0;
  }
  
  static int do_ubi(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
  {

  	int64_t size = 0;

  	ulong addr = 0;

  	bool skipcheck = false;

  
  	if (argc < 2)
  		return CMD_RET_USAGE;

  	if (strcmp(argv[1], "detach") == 0)

  		return ubi_detach();

  	if (strcmp(argv[1], "part") == 0) {

  		const char *vid_header_offset = NULL;

  		/* Print current partition */
  		if (argc == 2) {

  			if (!ubi) {
  				printf("Error, no UBI device selected!
  ");

  				return 1;
  			}

  			printf("Device %d: %s, MTD partition %s
  ",
  			       ubi->ubi_num, ubi->ubi_name, ubi->mtd->name);

  			return 0;
  		}

  		if (argc < 3)

  			return CMD_RET_USAGE;

  		if (argc > 3)
  			vid_header_offset = argv[3];

  		return ubi_part(argv[2], vid_header_offset);

  	}

  	if ((strcmp(argv[1], "part") != 0) && !ubi) {
  		printf("Error, no UBI device selected!
  ");

  		return 1;
  	}
  
  	if (strcmp(argv[1], "info") == 0) {
  		int layout = 0;
  		if (argc > 2 && !strncmp(argv[2], "l", 1))
  			layout = 1;
  		return ubi_info(layout);
  	}

  	if (strcmp(argv[1], "check") == 0) {
  		if (argc > 2)
  			return ubi_check(argv[2]);
  
  		printf("Error, no volume name passed
  ");
  		return 1;
  	}

  	if (strncmp(argv[1], "create", 6) == 0) {
  		int dynamic = 1;	/* default: dynamic volume */

  		int id = UBI_VOL_NUM_AUTO;

  
  		/* Use maximum available size */
  		size = 0;

  		/* E.g., create volume with "skipcheck" bit set */
  		if (argc == 7) {
  			skipcheck = strncmp(argv[6], "--skipcheck", 11) == 0;
  			argc--;
  		}

  		/* E.g., create volume size type vol_id */
  		if (argc == 6) {
  			id = simple_strtoull(argv[5], NULL, 16);
  			argc--;
  		}

  		/* E.g., create volume size type */
  		if (argc == 5) {
  			if (strncmp(argv[4], "s", 1) == 0)
  				dynamic = 0;
  			else if (strncmp(argv[4], "d", 1) != 0) {
  				printf("Incorrect type
  ");
  				return 1;
  			}
  			argc--;
  		}
  		/* E.g., create volume size */
  		if (argc == 4) {

  			if (argv[3][0] != '-')
  				size = simple_strtoull(argv[3], NULL, 16);

  			argc--;
  		}
  		/* Use maximum available size */

  		if (!size) {

  			size = (int64_t)ubi->avail_pebs * ubi->leb_size;
  			printf("No size specified -> Using max size (%lld)
  ", size);

  		}

  		/* E.g., create volume */

  		if (argc == 3) {
  			return ubi_create_vol(argv[2], size, dynamic, id,
  					      skipcheck);
  		}

  	}
  
  	if (strncmp(argv[1], "remove", 6) == 0) {
  		/* E.g., remove volume */
  		if (argc == 3)
  			return ubi_remove_vol(argv[2]);
  	}

  	if (strncmp(argv[1], "skipcheck", 9) == 0) {
  		/* E.g., change skip_check flag */
  		if (argc == 4) {
  			skipcheck = strncmp(argv[3], "on", 2) == 0;
  			return ubi_set_skip_check(argv[2], skipcheck);
  		}
  	}

  	if (strncmp(argv[1], "write", 5) == 0) {

  		int ret;

  		if (argc < 5) {
  			printf("Please see usage
  ");
  			return 1;
  		}
  
  		addr = simple_strtoul(argv[2], NULL, 16);

  		size = simple_strtoul(argv[4], NULL, 16);

  		if (strlen(argv[1]) == 10 &&
  		    strncmp(argv[1] + 5, ".part", 5) == 0) {
  			if (argc < 6) {
  				ret = ubi_volume_continue_write(argv[3],
  						(void *)addr, size);
  			} else {
  				size_t full_size;
  				full_size = simple_strtoul(argv[5], NULL, 16);
  				ret = ubi_volume_begin_write(argv[3],
  						(void *)addr, size, full_size);
  			}
  		} else {
  			ret = ubi_volume_write(argv[3], (void *)addr, size);
  		}

  		if (!ret) {

  			printf("%lld bytes written to volume %s
  ", size,

  			       argv[3]);
  		}
  
  		return ret;

  	}
  
  	if (strncmp(argv[1], "read", 4) == 0) {
  		size = 0;
  
  		/* E.g., read volume size */
  		if (argc == 5) {

  			size = simple_strtoul(argv[4], NULL, 16);

  			argc--;
  		}
  
  		/* E.g., read volume */
  		if (argc == 4) {
  			addr = simple_strtoul(argv[2], NULL, 16);
  			argc--;
  		}

  		if (argc == 3) {

  			return ubi_volume_read(argv[3], (char *)addr, size);

  		}

  	}
  
  	printf("Please see usage
  ");

  	return 1;

  }

  U_BOOT_CMD(

  	ubi, 7, 1, do_ubi,

  	"ubi commands",

  	"detach"
  		" - detach ubi from a mtd partition
  "
  	"ubi part [part] [offset]
  "

  		" - Show or set current partition (with optional VID"
  		" header offset)
  "

  	"ubi info [l[ayout]]"
  		" - Display volume and ubi layout information
  "

  	"ubi check volumename"
  		" - check if volumename exists
  "

  	"ubi create[vol] volume [size] [type] [id] [--skipcheck]
  "

  		" - create volume name with size ('-' for maximum"
  		" available size)
  "

  	"ubi write[vol] address volume size"
  		" - Write volume from address with size
  "

  	"ubi write.part address volume size [fullsize]
  "
  		" - Write part of a volume from address
  "

  	"ubi read[vol] address volume [size]"
  		" - Read volume to address with size
  "
  	"ubi remove[vol] volume"
  		" - Remove volume
  "

  	"ubi skipcheck volume on/off - Set or clear skip_check flag in volume header
  "

  	"[Legends]
  "

  	" volume: character name
  "
  	" size: specified in bytes
  "

  	" type: s[tatic] or d[ynamic] (default=dynamic)"

  );