/*
   * (C) Copyright 2008 Semihalf
   *
   * Written by: Rafal Czubak <rcz@semihalf.com>
   *             Bartlomiej Sieka <tur@semihalf.com>
   *
   * SPDX-License-Identifier:	GPL-2.0+
   */
  
  #include <common.h>
  
  #if !(defined(CONFIG_FIT) && defined(CONFIG_OF_LIBFDT))
  #error "CONFIG_FIT and CONFIG_OF_LIBFDT are required for auto-update feature"
  #endif
  
  #if defined(CONFIG_SYS_NO_FLASH)
  #error "CONFIG_SYS_NO_FLASH defined, but FLASH is required for auto-update feature"
  #endif
  
  #include <command.h>
  #include <flash.h>
  #include <net.h>
  #include <net/tftp.h>
  #include <malloc.h>
  
  /* env variable holding the location of the update file */
  #define UPDATE_FILE_ENV		"updatefile"
  
  /* set configuration defaults if needed */
  #ifndef CONFIG_UPDATE_LOAD_ADDR
  #define CONFIG_UPDATE_LOAD_ADDR	0x100000
  #endif
  
  #ifndef CONFIG_UPDATE_TFTP_MSEC_MAX
  #define CONFIG_UPDATE_TFTP_MSEC_MAX	100
  #endif
  
  #ifndef CONFIG_UPDATE_TFTP_CNT_MAX
  #define CONFIG_UPDATE_TFTP_CNT_MAX	0
  #endif
  
  extern ulong TftpRRQTimeoutMSecs;
  extern int TftpRRQTimeoutCountMax;
  extern flash_info_t flash_info[];
  extern ulong load_addr;
  
  static uchar *saved_prot_info;
  
  static int update_load(char *filename, ulong msec_max, int cnt_max, ulong addr)
  {
  	int size, rv;
  	ulong saved_timeout_msecs;
  	int saved_timeout_count;
  	char *saved_netretry, *saved_bootfile;
  
  	rv = 0;
  	/* save used globals and env variable */
  	saved_timeout_msecs = TftpRRQTimeoutMSecs;
  	saved_timeout_count = TftpRRQTimeoutCountMax;
  	saved_netretry = strdup(getenv("netretry"));
  	saved_bootfile = strdup(BootFile);
  
  	/* set timeouts for auto-update */
  	TftpRRQTimeoutMSecs = msec_max;
  	TftpRRQTimeoutCountMax = cnt_max;
  
  	/* we don't want to retry the connection if errors occur */
  	setenv("netretry", "no");
  
  	/* download the update file */
  	load_addr = addr;
  	copy_filename(BootFile, filename, sizeof(BootFile));
  	size = NetLoop(TFTPGET);
  
  	if (size < 0)
  		rv = 1;
  	else if (size > 0)
  		flush_cache(addr, size);
  
  	/* restore changed globals and env variable */
  	TftpRRQTimeoutMSecs = saved_timeout_msecs;
  	TftpRRQTimeoutCountMax = saved_timeout_count;
  
  	setenv("netretry", saved_netretry);
  	if (saved_netretry != NULL)
  		free(saved_netretry);
  
  	if (saved_bootfile != NULL) {
  		copy_filename(BootFile, saved_bootfile, sizeof(BootFile));
  		free(saved_bootfile);
  	}
  
  	return rv;
  }
  
  static int update_flash_protect(int prot, ulong addr_first, ulong addr_last)
  {
  	uchar *sp_info_ptr;
  	ulong s;
  	int i, bank, cnt;
  	flash_info_t *info;
  
  	sp_info_ptr = NULL;
  
  	if (prot == 0) {
  		saved_prot_info =
  			calloc(CONFIG_SYS_MAX_FLASH_BANKS * CONFIG_SYS_MAX_FLASH_SECT, 1);
  		if (!saved_prot_info)
  			return 1;
  	}
  
  	for (bank = 0; bank < CONFIG_SYS_MAX_FLASH_BANKS; ++bank) {
  		cnt = 0;
  		info = &flash_info[bank];
  
  		/* Nothing to do if the bank doesn't exist */
  		if (info->sector_count == 0)
  			return 0;
  
  		/* Point to current bank protection information */
  		sp_info_ptr = saved_prot_info + (bank * CONFIG_SYS_MAX_FLASH_SECT);
  
  		/*
  		 * Adjust addr_first or addr_last if we are on bank boundary.
  		 * Address space between banks must be continuous for other
  		 * flash functions (like flash_sect_erase or flash_write) to
  		 * succeed. Banks must also be numbered in correct order,
  		 * according to increasing addresses.
  		 */
  		if (addr_last > info->start[0] + info->size - 1)
  			addr_last = info->start[0] + info->size - 1;
  		if (addr_first < info->start[0])
  			addr_first = info->start[0];
  
  		for (i = 0; i < info->sector_count; i++) {
  			/* Save current information about protected sectors */
  			if (prot == 0) {
  				s = info->start[i];
  				if ((s >= addr_first) && (s <= addr_last))
  					sp_info_ptr[i] = info->protect[i];
  
  			}
  
  			/* Protect/unprotect sectors */
  			if (sp_info_ptr[i] == 1) {
  #if defined(CONFIG_SYS_FLASH_PROTECTION)
  				if (flash_real_protect(info, i, prot))
  					return 1;
  #else
  				info->protect[i] = prot;
  #endif
  				cnt++;
  			}
  		}
  
  		if (cnt) {
  			printf("%sProtected %d sectors
  ",
  						prot ? "": "Un-", cnt);
  		}
  	}
  
  	if((prot == 1) && saved_prot_info)
  		free(saved_prot_info);
  
  	return 0;
  }
  
  static int update_flash(ulong addr_source, ulong addr_first, ulong size)
  {
  	ulong addr_last = addr_first + size - 1;
  
  	/* round last address to the sector boundary */
  	if (flash_sect_roundb(&addr_last) > 0)
  		return 1;
  
  	if (addr_first >= addr_last) {
  		printf("Error: end address exceeds addressing space
  ");
  		return 1;
  	}
  
  	/* remove protection on processed sectors */
  	if (update_flash_protect(0, addr_first, addr_last) > 0) {
  		printf("Error: could not unprotect flash sectors
  ");
  		return 1;
  	}
  
  	printf("Erasing 0x%08lx - 0x%08lx", addr_first, addr_last);
  	if (flash_sect_erase(addr_first, addr_last) > 0) {
  		printf("Error: could not erase flash
  ");
  		return 1;
  	}
  
  	printf("Copying to flash...");
  	if (flash_write((char *)addr_source, addr_first, size) > 0) {
  		printf("Error: could not copy to flash
  ");
  		return 1;
  	}
  	printf("done
  ");
  
  	/* enable protection on processed sectors */
  	if (update_flash_protect(1, addr_first, addr_last) > 0) {
  		printf("Error: could not protect flash sectors
  ");
  		return 1;
  	}
  
  	return 0;
  }
  
  static int update_fit_getparams(const void *fit, int noffset, ulong *addr,
  						ulong *fladdr, ulong *size)
  {
  	const void *data;
  
  	if (fit_image_get_data(fit, noffset, &data, (size_t *)size))
  		return 1;
  
  	if (fit_image_get_load(fit, noffset, (ulong *)fladdr))
  		return 1;
  
  	*addr = (ulong)data;
  
  	return 0;
  }
  
  int update_tftp(ulong addr)
  {
  	char *filename, *env_addr;
  	int images_noffset, ndepth, noffset;
  	ulong update_addr, update_fladdr, update_size;
  	void *fit;
  	int ret = 0;
  
  	/* use already present image */
  	if (addr)
  		goto got_update_file;
  
  	printf("Auto-update from TFTP: ");
  
  	/* get the file name of the update file */
  	filename = getenv(UPDATE_FILE_ENV);
  	if (filename == NULL) {
  		printf("failed, env. variable '%s' not found
  ",
  							UPDATE_FILE_ENV);
  		return 1;
  	}
  
  	printf("trying update file '%s'
  ", filename);
  
  	/* get load address of downloaded update file */
  	if ((env_addr = getenv("loadaddr")) != NULL)
  		addr = simple_strtoul(env_addr, NULL, 16);
  	else
  		addr = CONFIG_UPDATE_LOAD_ADDR;
  
  
  	if (update_load(filename, CONFIG_UPDATE_TFTP_MSEC_MAX,
  					CONFIG_UPDATE_TFTP_CNT_MAX, addr)) {
  		printf("Can't load update file, aborting auto-update
  ");
  		return 1;
  	}
  
  got_update_file:
  	fit = (void *)addr;
  
  	if (!fit_check_format((void *)fit)) {
  		printf("Bad FIT format of the update file, aborting "
  							"auto-update
  ");
  		return 1;
  	}
  
  	/* process updates */
  	images_noffset = fdt_path_offset(fit, FIT_IMAGES_PATH);
  
  	ndepth = 0;
  	noffset = fdt_next_node(fit, images_noffset, &ndepth);
  	while (noffset >= 0 && ndepth > 0) {
  		if (ndepth != 1)
  			goto next_node;
  
  		printf("Processing update '%s' :",
  			fit_get_name(fit, noffset, NULL));
  
  		if (!fit_image_verify(fit, noffset)) {
  			printf("Error: invalid update hash, aborting
  ");
  			ret = 1;
  			goto next_node;
  		}
  
  		printf("
  ");
  		if (update_fit_getparams(fit, noffset, &update_addr,
  					&update_fladdr, &update_size)) {
  			printf("Error: can't get update parameteres, "
  								"aborting
  ");
  			ret = 1;
  			goto next_node;
  		}
  		if (update_flash(update_addr, update_fladdr, update_size)) {
  			printf("Error: can't flash update, aborting
  ");
  			ret = 1;
  			goto next_node;
  		}
  next_node:
  		noffset = fdt_next_node(fit, noffset, &ndepth);
  	}
  
  	return ret;
  }