/*
   * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.
   *
   * This program is free software; you can redistribute it and/or modify it
   * under the terms and conditions of the GNU General Public License,
   * version 2, as published by the Free Software Foundation.
   *
   * This program is distributed in the hope 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, see <http://www.gnu.org/licenses/>.
   */
  
  #include <config.h>
  #include <common.h>
  #include <part.h>
  #include <ext4fs.h>
  #include <fat.h>
  #include <fs.h>

  #include <sandboxfs.h>

  #include <asm/io.h>

  DECLARE_GLOBAL_DATA_PTR;

  static block_dev_desc_t *fs_dev_desc;
  static disk_partition_t fs_partition;
  static int fs_type = FS_TYPE_ANY;

  static inline int fs_probe_unsupported(block_dev_desc_t *fs_dev_desc,
  				      disk_partition_t *fs_partition)

  {
  	printf("** Unrecognized filesystem type **
  ");
  	return -1;
  }

  static inline int fs_ls_unsupported(const char *dirname)
  {

  	return -1;
  }

  static inline int fs_exists_unsupported(const char *filename)
  {
  	return 0;
  }

  static inline int fs_read_unsupported(const char *filename, void *buf,

  				      int offset, int len)
  {

  	return -1;
  }

  static inline int fs_write_unsupported(const char *filename, void *buf,
  				      int offset, int len)
  {
  	return -1;
  }

  static inline void fs_close_unsupported(void)
  {
  }

  struct fstype_info {

  	int fstype;

  	/*
  	 * Is it legal to pass NULL as .probe()'s  fs_dev_desc parameter? This
  	 * should be false in most cases. For "virtual" filesystems which
  	 * aren't based on a U-Boot block device (e.g. sandbox), this can be
  	 * set to true. This should also be true for the dumm entry at the end
  	 * of fstypes[], since that is essentially a "virtual" (non-existent)
  	 * filesystem.
  	 */
  	bool null_dev_desc_ok;

  	int (*probe)(block_dev_desc_t *fs_dev_desc,
  		     disk_partition_t *fs_partition);

  	int (*ls)(const char *dirname);

  	int (*exists)(const char *filename);

  	int (*read)(const char *filename, void *buf, int offset, int len);

  	int (*write)(const char *filename, void *buf, int offset, int len);

  	void (*close)(void);
  };
  
  static struct fstype_info fstypes[] = {
  #ifdef CONFIG_FS_FAT

  	{
  		.fstype = FS_TYPE_FAT,

  		.null_dev_desc_ok = false,

  		.probe = fat_set_blk_dev,
  		.close = fat_close,

  		.ls = file_fat_ls,

  		.exists = fat_exists,

  		.read = fat_read_file,

  		.write = fs_write_unsupported,

  	},

  #endif
  #ifdef CONFIG_FS_EXT4

  	{
  		.fstype = FS_TYPE_EXT,

  		.null_dev_desc_ok = false,

  		.probe = ext4fs_probe,
  		.close = ext4fs_close,

  		.ls = ext4fs_ls,

  		.exists = ext4fs_exists,

  		.read = ext4_read_file,

  		.write = fs_write_unsupported,

  	},
  #endif

  #ifdef CONFIG_SANDBOX
  	{
  		.fstype = FS_TYPE_SANDBOX,

  		.null_dev_desc_ok = true,

  		.probe = sandbox_fs_set_blk_dev,
  		.close = sandbox_fs_close,
  		.ls = sandbox_fs_ls,

  		.exists = sandbox_fs_exists,

  		.read = fs_read_sandbox,

  		.write = fs_write_sandbox,

  	},
  #endif

  	{
  		.fstype = FS_TYPE_ANY,

  		.null_dev_desc_ok = true,

  		.probe = fs_probe_unsupported,
  		.close = fs_close_unsupported,
  		.ls = fs_ls_unsupported,

  		.exists = fs_exists_unsupported,

  		.read = fs_read_unsupported,

  		.write = fs_write_unsupported,

  	},
  };

  static struct fstype_info *fs_get_info(int fstype)
  {
  	struct fstype_info *info;
  	int i;
  
  	for (i = 0, info = fstypes; i < ARRAY_SIZE(fstypes) - 1; i++, info++) {
  		if (fstype == info->fstype)
  			return info;
  	}
  
  	/* Return the 'unsupported' sentinel */
  	return info;
  }

  int fs_set_blk_dev(const char *ifname, const char *dev_part_str, int fstype)
  {

  	struct fstype_info *info;

  	int part, i;

  #ifdef CONFIG_NEEDS_MANUAL_RELOC
  	static int relocated;
  
  	if (!relocated) {

  		for (i = 0, info = fstypes; i < ARRAY_SIZE(fstypes);
  				i++, info++) {
  			info->probe += gd->reloc_off;
  			info->close += gd->reloc_off;
  			info->ls += gd->reloc_off;
  			info->read += gd->reloc_off;

  			info->write += gd->reloc_off;

  		}

  		relocated = 1;
  	}
  #endif

  
  	part = get_device_and_partition(ifname, dev_part_str, &fs_dev_desc,
  					&fs_partition, 1);
  	if (part < 0)
  		return -1;

  	for (i = 0, info = fstypes; i < ARRAY_SIZE(fstypes); i++, info++) {
  		if (fstype != FS_TYPE_ANY && info->fstype != FS_TYPE_ANY &&
  				fstype != info->fstype)

  			continue;

  		if (!fs_dev_desc && !info->null_dev_desc_ok)
  			continue;

  		if (!info->probe(fs_dev_desc, &fs_partition)) {

  			fs_type = info->fstype;

  			return 0;
  		}
  	}

  	return -1;
  }
  
  static void fs_close(void)
  {

  	struct fstype_info *info = fs_get_info(fs_type);

  	info->close();

  	fs_type = FS_TYPE_ANY;
  }
  
  int fs_ls(const char *dirname)
  {
  	int ret;

  	struct fstype_info *info = fs_get_info(fs_type);
  
  	ret = info->ls(dirname);

  	fs_type = FS_TYPE_ANY;

  	fs_close();
  
  	return ret;
  }

  int fs_exists(const char *filename)
  {
  	int ret;
  
  	struct fstype_info *info = fs_get_info(fs_type);
  
  	ret = info->exists(filename);
  
  	fs_close();
  
  	return ret;
  }

  int fs_read(const char *filename, ulong addr, int offset, int len)
  {

  	struct fstype_info *info = fs_get_info(fs_type);

  	void *buf;

  	int ret;

  	/*
  	 * We don't actually know how many bytes are being read, since len==0
  	 * means read the whole file.
  	 */
  	buf = map_sysmem(addr, len);
  	ret = info->read(filename, buf, offset, len);
  	unmap_sysmem(buf);

  	/* If we requested a specific number of bytes, check we got it */
  	if (ret >= 0 && len && ret != len) {
  		printf("** Unable to read file %s **
  ", filename);
  		ret = -1;
  	}

  	fs_close();
  
  	return ret;
  }

  int fs_write(const char *filename, ulong addr, int offset, int len)
  {
  	struct fstype_info *info = fs_get_info(fs_type);
  	void *buf;
  	int ret;

  	buf = map_sysmem(addr, len);
  	ret = info->write(filename, buf, offset, len);
  	unmap_sysmem(buf);

  	if (ret >= 0 && ret != len) {

  		printf("** Unable to write file %s **
  ", filename);
  		ret = -1;
  	}
  	fs_close();
  
  	return ret;
  }

  int do_load(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[],

  		int fstype)

  {
  	unsigned long addr;
  	const char *addr_str;
  	const char *filename;
  	unsigned long bytes;
  	unsigned long pos;
  	int len_read;

  	unsigned long time;

  	if (argc < 2)
  		return CMD_RET_USAGE;
  	if (argc > 7)

  		return CMD_RET_USAGE;

  	if (fs_set_blk_dev(argv[1], (argc >= 3) ? argv[2] : NULL, fstype))

  		return 1;
  
  	if (argc >= 4) {

  		addr = simple_strtoul(argv[3], NULL, 16);

  	} else {
  		addr_str = getenv("loadaddr");
  		if (addr_str != NULL)
  			addr = simple_strtoul(addr_str, NULL, 16);
  		else
  			addr = CONFIG_SYS_LOAD_ADDR;
  	}
  	if (argc >= 5) {
  		filename = argv[4];
  	} else {
  		filename = getenv("bootfile");
  		if (!filename) {
  			puts("** No boot file defined **
  ");
  			return 1;
  		}
  	}
  	if (argc >= 6)

  		bytes = simple_strtoul(argv[5], NULL, 16);

  	else
  		bytes = 0;
  	if (argc >= 7)

  		pos = simple_strtoul(argv[6], NULL, 16);

  	else
  		pos = 0;

  	time = get_timer(0);

  	len_read = fs_read(filename, addr, pos, bytes);

  	time = get_timer(time);

  	if (len_read <= 0)
  		return 1;

  	printf("%d bytes read in %lu ms", len_read, time);
  	if (time > 0) {
  		puts(" (");
  		print_size(len_read / time * 1000, "/s");
  		puts(")");
  	}
  	puts("
  ");

  	setenv_hex("filesize", len_read);

  
  	return 0;
  }
  
  int do_ls(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[],
  	int fstype)
  {
  	if (argc < 2)
  		return CMD_RET_USAGE;

  	if (argc > 4)
  		return CMD_RET_USAGE;

  
  	if (fs_set_blk_dev(argv[1], (argc >= 3) ? argv[2] : NULL, fstype))
  		return 1;

  	if (fs_ls(argc >= 4 ? argv[3] : "/"))

  		return 1;
  
  	return 0;
  }

  int file_exists(const char *dev_type, const char *dev_part, const char *file,
  		int fstype)
  {
  	if (fs_set_blk_dev(dev_type, dev_part, fstype))
  		return 0;
  
  	return fs_exists(file);
  }

  int do_save(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[],

  		int fstype)

  {
  	unsigned long addr;
  	const char *filename;
  	unsigned long bytes;
  	unsigned long pos;
  	int len;
  	unsigned long time;
  
  	if (argc < 6 || argc > 7)
  		return CMD_RET_USAGE;
  
  	if (fs_set_blk_dev(argv[1], argv[2], fstype))
  		return 1;
  
  	filename = argv[3];

  	addr = simple_strtoul(argv[4], NULL, 16);
  	bytes = simple_strtoul(argv[5], NULL, 16);

  	if (argc >= 7)

  		pos = simple_strtoul(argv[6], NULL, 16);

  	else
  		pos = 0;
  
  	time = get_timer(0);
  	len = fs_write(filename, addr, pos, bytes);
  	time = get_timer(time);
  	if (len <= 0)
  		return 1;
  
  	printf("%d bytes written in %lu ms", len, time);
  	if (time > 0) {
  		puts(" (");
  		print_size(len / time * 1000, "/s");
  		puts(")");
  	}
  	puts("
  ");
  
  	return 0;
  }