/*
   * Copyright 2012-2014 Freescale Semiconductor, Inc.
   *
   * SPDX-License-Identifier:	GPL-2.0+
   */
  #include "imagetool.h"
  #include <image.h>
  #include "pblimage.h"
  #include "pbl_crc32.h"
  
  #define roundup(x, y)		((((x) + ((y) - 1)) / (y)) * (y))
  #define PBL_ACS_CONT_CMD	0x81000000
  #define PBL_ADDR_24BIT_MASK	0x00ffffff
  
  /*
   * Initialize to an invalid value.
   */
  static uint32_t next_pbl_cmd = 0x82000000;
  /*
   * need to store all bytes in memory for calculating crc32, then write the
   * bytes to image file for PBL boot.
   */
  static unsigned char mem_buf[1000000];
  static unsigned char *pmem_buf = mem_buf;
  static int pbl_size;
  static char *fname = "Unknown";
  static int lineno = -1;
  static struct pbl_header pblimage_header;
  static int uboot_size;
  static int arch_flag;
  
  static uint32_t pbl_cmd_initaddr;
  static uint32_t pbi_crc_cmd1;
  static uint32_t pbi_crc_cmd2;
  static uint32_t pbl_end_cmd[4];
  
  static union
  {
  	char c[4];
  	unsigned char l;
  } endian_test = { {'l', '?', '?', 'b'} };
  
  #define ENDIANNESS ((char)endian_test.l)
  
  /*
   * The PBL can load up to 64 bytes at a time, so we split the U-Boot
   * image into 64 byte chunks. PBL needs a command for each piece, of
   * the form "81xxxxxx", where "xxxxxx" is the offset. Calculate the
   * start offset by subtracting the size of the u-boot image from the
   * top of the allowable 24-bit range.
   */
  static void generate_pbl_cmd(void)
  {
  	uint32_t val = next_pbl_cmd;
  	next_pbl_cmd += 0x40;
  	int i;
  
  	for (i = 3; i >= 0; i--) {
  		*pmem_buf++ = (val >> (i * 8)) & 0xff;
  		pbl_size++;
  	}
  }
  
  static void pbl_fget(size_t size, FILE *stream)
  {
  	unsigned char c = 0xff;
  	int c_temp;
  
  	while (size) {
  		c_temp = fgetc(stream);
  		if (c_temp != EOF)
  			c = (unsigned char)c_temp;
  		else if ((c_temp == EOF) && (arch_flag == IH_ARCH_ARM))
  			c = 0xff;
  		*pmem_buf++ = c;
  		pbl_size++;
  		size--;
  	}
  }
  
  /* load split u-boot with PBI command 81xxxxxx. */
  static void load_uboot(FILE *fp_uboot)
  {
  	next_pbl_cmd = pbl_cmd_initaddr - uboot_size;
  	while (next_pbl_cmd < pbl_cmd_initaddr) {
  		generate_pbl_cmd();
  		pbl_fget(64, fp_uboot);
  	}
  }
  
  static void check_get_hexval(char *token)
  {
  	uint32_t hexval;
  	int i;
  
  	if (!sscanf(token, "%x", &hexval)) {
  		printf("Error:%s[%d] - Invalid hex data(%s)
  ", fname,
  			lineno, token);
  		exit(EXIT_FAILURE);
  	}
  	for (i = 3; i >= 0; i--) {
  		*pmem_buf++ = (hexval >> (i * 8)) & 0xff;
  		pbl_size++;
  	}
  }
  
  static void pbl_parser(char *name)
  {
  	FILE *fd = NULL;
  	char *line = NULL;
  	char *token, *saveptr1, *saveptr2;
  	size_t len = 0;
  
  	fname = name;
  	fd = fopen(name, "r");
  	if (fd == NULL) {
  		printf("Error:%s - Can't open
  ", fname);
  		exit(EXIT_FAILURE);
  	}
  
  	while ((getline(&line, &len, fd)) > 0) {
  		lineno++;
  		token = strtok_r(line, "\r
  ", &saveptr1);
  		/* drop all lines with zero tokens (= empty lines) */
  		if (token == NULL)
  			continue;
  		for (line = token;; line = NULL) {
  			token = strtok_r(line, " \t", &saveptr2);
  			if (token == NULL)
  				break;
  			/* Drop all text starting with '#' as comments */
  			if (token[0] == '#')
  				break;
  			check_get_hexval(token);
  		}
  	}
  	if (line)
  		free(line);
  	fclose(fd);
  }
  
  static uint32_t reverse_byte(uint32_t val)
  {
  	uint32_t temp;
  	unsigned char *p1;
  	int j;
  
  	temp = val;
  	p1 = (unsigned char *)&temp;
  	for (j = 3; j >= 0; j--)
  		*p1++ = (val >> (j * 8)) & 0xff;
  	return temp;
  }
  
  /* write end command and crc command to memory. */
  static void add_end_cmd(void)
  {
  	uint32_t crc32_pbl;
  	int i;
  	unsigned char *p = (unsigned char *)&pbl_end_cmd;
  
  	if (ENDIANNESS == 'l') {
  		for (i = 0; i < 4; i++)
  			pbl_end_cmd[i] = reverse_byte(pbl_end_cmd[i]);
  	}
  
  	for (i = 0; i < 16; i++) {
  		*pmem_buf++ = *p++;
  		pbl_size++;
  	}
  
  	/* Add PBI CRC command. */
  	*pmem_buf++ = 0x08;
  	*pmem_buf++ = pbi_crc_cmd1;
  	*pmem_buf++ = pbi_crc_cmd2;
  	*pmem_buf++ = 0x40;
  	pbl_size += 4;
  
  	/* calculated CRC32 and write it to memory. */
  	crc32_pbl = pbl_crc32(0, (const char *)mem_buf, pbl_size);
  	*pmem_buf++ = (crc32_pbl >> 24) & 0xff;
  	*pmem_buf++ = (crc32_pbl >> 16) & 0xff;
  	*pmem_buf++ = (crc32_pbl >> 8) & 0xff;
  	*pmem_buf++ = (crc32_pbl) & 0xff;
  	pbl_size += 4;
  }
  
  void pbl_load_uboot(int ifd, struct image_tool_params *params)
  {
  	FILE *fp_uboot;
  	int size;
  
  	/* parse the rcw.cfg file. */
  	pbl_parser(params->imagename);
  
  	/* parse the pbi.cfg file. */
  	pbl_parser(params->imagename2);
  
  	fp_uboot = fopen(params->datafile, "r");
  	if (fp_uboot == NULL) {
  		printf("Error: %s open failed
  ", params->datafile);
  		exit(EXIT_FAILURE);
  	}
  
  	load_uboot(fp_uboot);
  	add_end_cmd();
  	fclose(fp_uboot);
  	lseek(ifd, 0, SEEK_SET);
  
  	size = pbl_size;
  	if (write(ifd, (const void *)&mem_buf, size) != size) {
  		fprintf(stderr, "Write error on %s: %s
  ",
  			params->imagefile, strerror(errno));
  		exit(EXIT_FAILURE);
  	}
  }
  
  static int pblimage_check_image_types(uint8_t type)
  {
  	if (type == IH_TYPE_PBLIMAGE)
  		return EXIT_SUCCESS;
  	else
  		return EXIT_FAILURE;
  }
  
  static int pblimage_verify_header(unsigned char *ptr, int image_size,
  			struct image_tool_params *params)
  {
  	struct pbl_header *pbl_hdr = (struct pbl_header *) ptr;
  
  	/* Only a few checks can be done: search for magic numbers */
  	if (ENDIANNESS == 'l') {
  		if (pbl_hdr->preamble != reverse_byte(RCW_PREAMBLE))
  			return -FDT_ERR_BADSTRUCTURE;
  
  		if (pbl_hdr->rcwheader != reverse_byte(RCW_HEADER))
  			return -FDT_ERR_BADSTRUCTURE;
  	} else {
  		if (pbl_hdr->preamble != RCW_PREAMBLE)
  			return -FDT_ERR_BADSTRUCTURE;
  
  		if (pbl_hdr->rcwheader != RCW_HEADER)
  			return -FDT_ERR_BADSTRUCTURE;
  	}
  	return 0;
  }
  
  static void pblimage_print_header(const void *ptr)
  {
  	printf("Image Type:   Freescale PBL Boot Image
  ");
  }
  
  static void pblimage_set_header(void *ptr, struct stat *sbuf, int ifd,
  				struct image_tool_params *params)
  {
  	/*nothing need to do, pbl_load_uboot takes care of whole file. */
  }
  
  int pblimage_check_params(struct image_tool_params *params)
  {
  	FILE *fp_uboot;
  	int fd;
  	struct stat st;
  
  	if (!params)
  		return EXIT_FAILURE;
  
  	fp_uboot = fopen(params->datafile, "r");
  	if (fp_uboot == NULL) {
  		printf("Error: %s open failed
  ", params->datafile);
  		exit(EXIT_FAILURE);
  	}
  	fd = fileno(fp_uboot);
  
  	if (fstat(fd, &st) == -1) {
  		printf("Error: Could not determine u-boot image size. %s
  ",
  		       strerror(errno));
  		exit(EXIT_FAILURE);
  	}
  
  	/* For the variable size, we need to pad it to 64 byte boundary */
  	uboot_size = roundup(st.st_size, 64);
  
  	if (params->arch == IH_ARCH_ARM) {
  		arch_flag = IH_ARCH_ARM;
  		pbi_crc_cmd1 = 0x61;
  		pbi_crc_cmd2 = 0;
  		pbl_cmd_initaddr = params->addr & PBL_ADDR_24BIT_MASK;
  		pbl_cmd_initaddr |= PBL_ACS_CONT_CMD;
  		pbl_cmd_initaddr |= uboot_size;
  		pbl_end_cmd[0] = 0x09610000;
  		pbl_end_cmd[1] = 0x00000000;
  		pbl_end_cmd[2] = 0x096100c0;
  		pbl_end_cmd[3] = 0x00000000;
  	} else if (params->arch == IH_ARCH_PPC) {
  		arch_flag = IH_ARCH_PPC;
  		pbi_crc_cmd1 = 0x13;
  		pbi_crc_cmd2 = 0x80;
  		pbl_cmd_initaddr = 0x82000000;
  		pbl_end_cmd[0] = 0x09138000;
  		pbl_end_cmd[1] = 0x00000000;
  		pbl_end_cmd[2] = 0x091380c0;
  		pbl_end_cmd[3] = 0x00000000;
  	}
  
  	next_pbl_cmd = pbl_cmd_initaddr;
  	return 0;
  };
  
  /* pblimage parameters */
  U_BOOT_IMAGE_TYPE(
  	pblimage,
  	"Freescale PBL Boot Image support",
  	sizeof(struct pbl_header),
  	(void *)&pblimage_header,
  	pblimage_check_params,
  	pblimage_verify_header,
  	pblimage_print_header,
  	pblimage_set_header,
  	NULL,
  	pblimage_check_image_types,
  	NULL,
  	NULL
  );