/*
 * (C) Copyright 2008 Semihalf
 *
 * (C) Copyright 2000-2006
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that 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, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */


#include <common.h>
#include <watchdog.h>
#include <command.h>
#include <image.h>
#include <malloc.h>
#include <zlib.h>
#include <bzlib.h>
#include <environment.h>
#include <asm/byteorder.h>

#if defined(CONFIG_OF_LIBFDT)
#include <fdt.h>
#include <libfdt.h>
#include <fdt_support.h>

static void fdt_error (const char *msg);
static int boot_get_fdt (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[],
		bootm_headers_t *images, char **of_flat_tree, ulong *of_size);
static int boot_relocate_fdt (struct lmb *lmb, ulong bootmap_base,
		cmd_tbl_t *cmdtp, int flag, int argc, char *argv[],
		char **of_flat_tree, ulong *of_size);
#endif

#ifdef CFG_INIT_RAM_LOCK
#include <asm/cache.h>
#endif

DECLARE_GLOBAL_DATA_PTR;

extern int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]);
extern ulong get_effective_memsize(void);
static ulong get_sp (void);
static void set_clocks_in_mhz (bd_t *kbd);

#ifndef CFG_LINUX_LOWMEM_MAX_SIZE
#define CFG_LINUX_LOWMEM_MAX_SIZE	(768*1024*1024)
#endif

void  __attribute__((noinline))
do_bootm_linux(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[],
		bootm_headers_t *images)
{
	ulong	sp;

	ulong	initrd_start, initrd_end;
	ulong	rd_data_start, rd_data_end, rd_len;
	ulong	size;
	phys_size_t bootm_size;

	ulong	cmd_start, cmd_end, bootmap_base;
	bd_t	*kbd;
	ulong	ep = 0;
	void	(*kernel)(bd_t *, ulong, ulong, ulong, ulong);
	int	ret;
	ulong	of_size = 0;
	struct lmb *lmb = images->lmb;

#if defined(CONFIG_OF_LIBFDT)
	char	*of_flat_tree = NULL;
#endif

	bootmap_base = getenv_bootm_low();
	bootm_size = getenv_bootm_size();

#ifdef DEBUG
	if (((u64)bootmap_base + bootm_size) >
	    (CFG_SDRAM_BASE + (u64)gd->ram_size))
		puts("WARNING: bootm_low + bootm_size exceed total memory\n");
	if ((bootmap_base + bootm_size) > get_effective_memsize())
		puts("WARNING: bootm_low + bootm_size exceed eff. memory\n");
#endif

	size = min(bootm_size, get_effective_memsize());
	size = min(size, CFG_LINUX_LOWMEM_MAX_SIZE);

	if (size < bootm_size) {
		ulong base = bootmap_base + size;
		printf("WARNING: adjusting available memory to %x\n", size);
		lmb_reserve(lmb, base, bootm_size - size);
	}

	/*
	 * Booting a (Linux) kernel image
	 *
	 * Allocate space for command line and board info - the
	 * address should be as high as possible within the reach of
	 * the kernel (see CFG_BOOTMAPSZ settings), but in unused
	 * memory, which means far enough below the current stack
	 * pointer.
	 */
	sp = get_sp();
	debug ("## Current stack ends at 0x%08lx\n", sp);

	/* adjust sp by 1K to be safe */
	sp -= 1024;
	lmb_reserve(lmb, sp, (CFG_SDRAM_BASE + get_effective_memsize() - sp));

#if defined(CONFIG_OF_LIBFDT)
	/* find flattened device tree */
	ret = boot_get_fdt (cmdtp, flag, argc, argv, images, &of_flat_tree, &of_size);

	if (ret)
		goto error;
#endif

	if (!of_size) {
		/* allocate space and init command line */
		ret = boot_get_cmdline (lmb, &cmd_start, &cmd_end, bootmap_base);
		if (ret) {
			puts("ERROR with allocation of cmdline\n");
			goto error;
		}

		/* allocate space for kernel copy of board info */
		ret = boot_get_kbd (lmb, &kbd, bootmap_base);
		if (ret) {
			puts("ERROR with allocation of kernel bd\n");
			goto error;
		}
		set_clocks_in_mhz(kbd);
	}

	/* find kernel entry point */
	if (images->legacy_hdr_valid) {
		ep = image_get_ep (&images->legacy_hdr_os_copy);
#if defined(CONFIG_FIT)
	} else if (images->fit_uname_os) {
		ret = fit_image_get_entry (images->fit_hdr_os,
				images->fit_noffset_os, &ep);
		if (ret) {
			puts ("Can't get entry point property!\n");
			goto error;
		}
#endif
	} else {
		puts ("Could not find kernel entry point!\n");
		goto error;
	}
	kernel = (void (*)(bd_t *, ulong, ulong, ulong, ulong))ep;

	/* find ramdisk */
	ret = boot_get_ramdisk (argc, argv, images, IH_ARCH_PPC,
			&rd_data_start, &rd_data_end);
	if (ret)
		goto error;

	rd_len = rd_data_end - rd_data_start;

#if defined(CONFIG_OF_LIBFDT)
	ret = boot_relocate_fdt (lmb, bootmap_base,
		cmdtp, flag, argc, argv, &of_flat_tree, &of_size);

	/*
	 * Add the chosen node if it doesn't exist, add the env and bd_t
	 * if the user wants it (the logic is in the subroutines).
	 */
	if (of_size) {
		/* pass in dummy initrd info, we'll fix up later */
		if (fdt_chosen(of_flat_tree, rd_data_start, rd_data_end, 0) < 0) {
			fdt_error ("/chosen node create failed");
			goto error;
		}
#ifdef CONFIG_OF_BOARD_SETUP
		/* Call the board-specific fixup routine */
		ft_board_setup(of_flat_tree, gd->bd);
#endif
	}
#endif	/* CONFIG_OF_LIBFDT */

	ret = boot_ramdisk_high (lmb, rd_data_start, rd_len, &initrd_start, &initrd_end);
	if (ret)
		goto error;

#if defined(CONFIG_OF_LIBFDT)
	/* fixup the initrd now that we know where it should be */
	if ((of_flat_tree) && (initrd_start && initrd_end)) {
		uint64_t addr, size;
		int  total = fdt_num_mem_rsv(of_flat_tree);
		int  j;

		/* Look for the dummy entry and delete it */
		for (j = 0; j < total; j++) {
			fdt_get_mem_rsv(of_flat_tree, j, &addr, &size);
			if (addr == rd_data_start) {
				fdt_del_mem_rsv(of_flat_tree, j);
				break;
			}
		}

		ret = fdt_add_mem_rsv(of_flat_tree, initrd_start,
					initrd_end - initrd_start + 1);
		if (ret < 0) {
			printf("fdt_chosen: %s\n", fdt_strerror(ret));
			goto error;
		}

		do_fixup_by_path_u32(of_flat_tree, "/chosen",
					"linux,initrd-start", initrd_start, 0);
		do_fixup_by_path_u32(of_flat_tree, "/chosen",
					"linux,initrd-end", initrd_end, 0);
	}
#endif
	debug ("## Transferring control to Linux (at address %08lx) ...\n",
		(ulong)kernel);

	show_boot_progress (15);

#if defined(CFG_INIT_RAM_LOCK) && !defined(CONFIG_E500)
	unlock_ram_in_cache();
#endif
	if (!images->autostart)
		return ;

#if defined(CONFIG_OF_LIBFDT)
	if (of_flat_tree) {	/* device tree; boot new style */
		/*
		 * Linux Kernel Parameters (passing device tree):
		 *   r3: pointer to the fdt, followed by the board info data
		 *   r4: physical pointer to the kernel itself
		 *   r5: NULL
		 *   r6: NULL
		 *   r7: NULL
		 */
		debug ("   Booting using OF flat tree...\n");
		(*kernel) ((bd_t *)of_flat_tree, (ulong)kernel, 0, 0, 0);
		/* does not return */
	} else
#endif
	{
		/*
		 * Linux Kernel Parameters (passing board info data):
		 *   r3: ptr to board info data
		 *   r4: initrd_start or 0 if no initrd
		 *   r5: initrd_end - unused if r4 is 0
		 *   r6: Start of command line string
		 *   r7: End   of command line string
		 */
		debug ("   Booting using board info...\n");
		(*kernel) (kbd, initrd_start, initrd_end, cmd_start, cmd_end);
		/* does not return */
	}
	return ;

error:
	if (images->autostart)
		do_reset (cmdtp, flag, argc, argv);
	return ;
}

static ulong get_sp (void)
{
	ulong sp;

	asm( "mr %0,1": "=r"(sp) : );
	return sp;
}

static void set_clocks_in_mhz (bd_t *kbd)
{
	char	*s;

	if ((s = getenv ("clocks_in_mhz")) != NULL) {
		/* convert all clock information to MHz */
		kbd->bi_intfreq /= 1000000L;
		kbd->bi_busfreq /= 1000000L;
#if defined(CONFIG_MPC8220)
		kbd->bi_inpfreq /= 1000000L;
		kbd->bi_pcifreq /= 1000000L;
		kbd->bi_pevfreq /= 1000000L;
		kbd->bi_flbfreq /= 1000000L;
		kbd->bi_vcofreq /= 1000000L;
#endif
#if defined(CONFIG_CPM2)
		kbd->bi_cpmfreq /= 1000000L;
		kbd->bi_brgfreq /= 1000000L;
		kbd->bi_sccfreq /= 1000000L;
		kbd->bi_vco	/= 1000000L;
#endif
#if defined(CONFIG_MPC5xxx)
		kbd->bi_ipbfreq /= 1000000L;
		kbd->bi_pcifreq /= 1000000L;
#endif /* CONFIG_MPC5xxx */
	}
}

#if defined(CONFIG_OF_LIBFDT)
static void fdt_error (const char *msg)
{
	puts ("ERROR: ");
	puts (msg);
	puts (" - must RESET the board to recover.\n");
}

static image_header_t *image_get_fdt (ulong fdt_addr)
{
	image_header_t *fdt_hdr = (image_header_t *)fdt_addr;

	image_print_contents (fdt_hdr);

	puts ("   Verifying Checksum ... ");
	if (!image_check_hcrc (fdt_hdr)) {
		fdt_error ("fdt header checksum invalid");
		return NULL;
	}

	if (!image_check_dcrc (fdt_hdr)) {
		fdt_error ("fdt checksum invalid");
		return NULL;
	}
	puts ("OK\n");

	if (!image_check_type (fdt_hdr, IH_TYPE_FLATDT)) {
		fdt_error ("uImage is not a fdt");
		return NULL;
	}
	if (image_get_comp (fdt_hdr) != IH_COMP_NONE) {
		fdt_error ("uImage is compressed");
		return NULL;
	}
	if (fdt_check_header ((char *)image_get_data (fdt_hdr)) != 0) {
		fdt_error ("uImage data is not a fdt");
		return NULL;
	}
	return fdt_hdr;
}

/**
 * fit_check_fdt - verify FIT format FDT subimage
 * @fit_hdr: pointer to the FIT  header
 * fdt_noffset: FDT subimage node offset within FIT image
 * @verify: data CRC verification flag
 *
 * fit_check_fdt() verifies integrity of the FDT subimage and from
 * specified FIT image.
 *
 * returns:
 *     1, on success
 *     0, on failure
 */
#if defined(CONFIG_FIT)
static int fit_check_fdt (const void *fit, int fdt_noffset, int verify)
{
	fit_image_print (fit, fdt_noffset, "   ");

	if (verify) {
		puts ("   Verifying Hash Integrity ... ");
		if (!fit_image_check_hashes (fit, fdt_noffset)) {
			fdt_error ("Bad Data Hash");
			return 0;
		}
		puts ("OK\n");
	}

	if (!fit_image_check_type (fit, fdt_noffset, IH_TYPE_FLATDT)) {
		fdt_error ("Not a FDT image");
		return 0;
	}

	if (!fit_image_check_comp (fit, fdt_noffset, IH_COMP_NONE)) {
		fdt_error ("FDT image is compressed");
		return 0;
	}

	return 1;
}
#endif /* CONFIG_FIT */

static int boot_get_fdt (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[],
		bootm_headers_t *images, char **of_flat_tree, ulong *of_size)
{
	ulong		fdt_addr;
	image_header_t	*fdt_hdr;
	char		*fdt_blob = NULL;
	ulong		image_start, image_end;
	ulong		load_start, load_end;
#if defined(CONFIG_FIT)
	void		*fit_hdr;
	const char	*fit_uname_config = NULL;
	const char	*fit_uname_fdt = NULL;
	ulong		default_addr;
	int		cfg_noffset;
	int		fdt_noffset;
	const void	*data;
	size_t		size;
#endif

	*of_flat_tree = NULL;
	*of_size = 0;

	if (argc > 3 || genimg_has_config (images)) {
#if defined(CONFIG_FIT)
		if (argc > 3) {
			/*
			 * If the FDT blob comes from the FIT image and the
			 * FIT image address is omitted in the command line
			 * argument, try to use ramdisk or os FIT image
			 * address or default load address.
			 */
			if (images->fit_uname_rd)
				default_addr = (ulong)images->fit_hdr_rd;
			else if (images->fit_uname_os)
				default_addr = (ulong)images->fit_hdr_os;
			else
				default_addr = load_addr;

			if (fit_parse_conf (argv[3], default_addr,
						&fdt_addr, &fit_uname_config)) {
				debug ("*  fdt: config '%s' from image at 0x%08lx\n",
						fit_uname_config, fdt_addr);
			} else if (fit_parse_subimage (argv[3], default_addr,
						&fdt_addr, &fit_uname_fdt)) {
				debug ("*  fdt: subimage '%s' from image at 0x%08lx\n",
						fit_uname_fdt, fdt_addr);
			} else
#endif
			{
				fdt_addr = simple_strtoul(argv[3], NULL, 16);
				debug ("*  fdt: cmdline image address = 0x%08lx\n",
						fdt_addr);
			}
#if defined(CONFIG_FIT)
		} else {
			/* use FIT configuration provided in first bootm
			 * command argument
			 */
			fdt_addr = (ulong)images->fit_hdr_os;
			fit_uname_config = images->fit_uname_cfg;
			debug ("*  fdt: using config '%s' from image at 0x%08lx\n",
					fit_uname_config, fdt_addr);

			/*
			 * Check whether configuration has FDT blob defined,
			 * if not quit silently.
			 */
			fit_hdr = (void *)fdt_addr;
			cfg_noffset = fit_conf_get_node (fit_hdr,
					fit_uname_config);
			if (cfg_noffset < 0) {
				debug ("*  fdt: no such config\n");
				return 0;
			}

			fdt_noffset = fit_conf_get_fdt_node (fit_hdr,
					cfg_noffset);
			if (fdt_noffset < 0) {
				debug ("*  fdt: no fdt in config\n");
				return 0;
			}
		}
#endif

		debug ("## Checking for 'FDT'/'FDT Image' at %08lx\n",
				fdt_addr);

		/* copy from dataflash if needed */
		fdt_addr = genimg_get_image (fdt_addr);

		/*
		 * Check if there is an FDT image at the
		 * address provided in the second bootm argument
		 * check image type, for FIT images get a FIT node.
		 */
		switch (genimg_get_format ((void *)fdt_addr)) {
		case IMAGE_FORMAT_LEGACY:
			/* verify fdt_addr points to a valid image header */
			printf ("## Flattened Device Tree from Legacy Image at %08lx\n",
					fdt_addr);
			fdt_hdr = image_get_fdt (fdt_addr);
			if (!fdt_hdr)
				goto error;

			/*
			 * move image data to the load address,
			 * make sure we don't overwrite initial image
			 */
			image_start = (ulong)fdt_hdr;
			image_end = image_get_image_end (fdt_hdr);

			load_start = image_get_load (fdt_hdr);
			load_end = load_start + image_get_data_size (fdt_hdr);

			if ((load_start < image_end) && (load_end > image_start)) {
				fdt_error ("fdt overwritten");
				goto error;
			}

			debug ("   Loading FDT from 0x%08lx to 0x%08lx\n",
					image_get_data (fdt_hdr), load_start);

			memmove ((void *)load_start,
					(void *)image_get_data (fdt_hdr),
					image_get_data_size (fdt_hdr));

			fdt_blob = (char *)load_start;
			break;
		case IMAGE_FORMAT_FIT:
			/*
			 * This case will catch both: new uImage format
			 * (libfdt based) and raw FDT blob (also libfdt
			 * based).
			 */
#if defined(CONFIG_FIT)
			/* check FDT blob vs FIT blob */
			if (fit_check_format ((const void *)fdt_addr)) {
				/*
				 * FIT image
				 */
				fit_hdr = (void *)fdt_addr;
				printf ("## Flattened Device Tree from FIT Image at %08lx\n",
						fdt_addr);

				if (!fit_uname_fdt) {
					/*
					 * no FDT blob image node unit name,
					 * try to get config node first. If
					 * config unit node name is NULL
					 * fit_conf_get_node() will try to
					 * find default config node
					 */
					cfg_noffset = fit_conf_get_node (fit_hdr,
							fit_uname_config);

					if (cfg_noffset < 0) {
						fdt_error ("Could not find configuration node\n");
						goto error;
					}

					fit_uname_config = fdt_get_name (fit_hdr,
							cfg_noffset, NULL);
					printf ("   Using '%s' configuration\n",
							fit_uname_config);

					fdt_noffset = fit_conf_get_fdt_node (fit_hdr,
							cfg_noffset);
					fit_uname_fdt = fit_get_name (fit_hdr,
							fdt_noffset, NULL);
				} else {
					/* get FDT component image node offset */
					fdt_noffset = fit_image_get_node (fit_hdr,
							fit_uname_fdt);
				}
				if (fdt_noffset < 0) {
					fdt_error ("Could not find subimage node\n");
					goto error;
				}

				printf ("   Trying '%s' FDT blob subimage\n",
						fit_uname_fdt);

				if (!fit_check_fdt (fit_hdr, fdt_noffset,
							images->verify))
					goto error;

				/* get ramdisk image data address and length */
				if (fit_image_get_data (fit_hdr, fdt_noffset,
							&data, &size)) {
					fdt_error ("Could not find FDT subimage data");
					goto error;
				}

				/* verift that image data is a proper FDT blob */
				if (fdt_check_header ((char *)data) != 0) {
					fdt_error ("Subimage data is not a FTD");
					goto error;
				}

				/*
				 * move image data to the load address,
				 * make sure we don't overwrite initial image
				 */
				image_start = (ulong)fit_hdr;
				image_end = fit_get_end (fit_hdr);

				if (fit_image_get_load (fit_hdr, fdt_noffset,
							&load_start) == 0) {
					load_end = load_start + size;

					if ((load_start < image_end) &&
							(load_end > image_start)) {
						fdt_error ("FDT overwritten");
						goto error;
					}

					printf ("   Loading FDT from 0x%08lx to 0x%08lx\n",
							(ulong)data, load_start);

					memmove ((void *)load_start,
							(void *)data, size);

					fdt_blob = (char *)load_start;
				} else {
					fdt_blob = (char *)data;
				}

				images->fit_hdr_fdt = fit_hdr;
				images->fit_uname_fdt = fit_uname_fdt;
				images->fit_noffset_fdt = fdt_noffset;
				break;
			} else
#endif
			{
				/*
				 * FDT blob
				 */
				fdt_blob = (char *)fdt_addr;
				debug ("*  fdt: raw FDT blob\n");
				printf ("## Flattened Device Tree blob at %08lx\n", fdt_blob);
			}
			break;
		default:
			fdt_error ("Did not find a cmdline Flattened Device Tree");
			goto error;
		}

		printf ("   Booting using the fdt blob at 0x%x\n", fdt_blob);

	} else if (images->legacy_hdr_valid &&
			image_check_type (&images->legacy_hdr_os_copy, IH_TYPE_MULTI)) {

		ulong fdt_data, fdt_len;

		/*
		 * Now check if we have a legacy multi-component image,
		 * get second entry data start address and len.
		 */
		printf ("## Flattened Device Tree from multi "
			"component Image at %08lX\n",
			(ulong)images->legacy_hdr_os);

		image_multi_getimg (images->legacy_hdr_os, 2, &fdt_data, &fdt_len);
		if (fdt_len) {

			fdt_blob = (char *)fdt_data;
			printf ("   Booting using the fdt at 0x%x\n", fdt_blob);

			if (fdt_check_header (fdt_blob) != 0) {
				fdt_error ("image is not a fdt");
				goto error;
			}

			if (be32_to_cpu (fdt_totalsize (fdt_blob)) != fdt_len) {
				fdt_error ("fdt size != image size");
				goto error;
			}
		} else {
			debug ("## No Flattened Device Tree\n");
			return 0;
		}
	} else {
		debug ("## No Flattened Device Tree\n");
		return 0;
	}

	*of_flat_tree = fdt_blob;
	*of_size = be32_to_cpu (fdt_totalsize (fdt_blob));
	debug ("   of_flat_tree at 0x%08lx size 0x%08lx\n",
			*of_flat_tree, *of_size);

	return 0;

error:
	do_reset (cmdtp, flag, argc, argv);
	return 1;
}

static int boot_relocate_fdt (struct lmb *lmb, ulong bootmap_base,
		cmd_tbl_t *cmdtp, int flag, int argc, char *argv[],
		char **of_flat_tree, ulong *of_size)
{
	char	*fdt_blob = *of_flat_tree;
	ulong	relocate = 0;
	ulong	of_len = 0;

	/* nothing to do */
	if (*of_size == 0)
		return 0;

	if (fdt_check_header (fdt_blob) != 0) {
		fdt_error ("image is not a fdt");
		goto error;
	}

#ifndef CFG_NO_FLASH
	/* move the blob if it is in flash (set relocate) */
	if (addr2info ((ulong)fdt_blob) != NULL)
		relocate = 1;
#endif

	/*
	 * The blob must be within CFG_BOOTMAPSZ,
	 * so we flag it to be copied if it is not.
	 */
	if (fdt_blob >= (char *)CFG_BOOTMAPSZ)
		relocate = 1;

	of_len = be32_to_cpu (fdt_totalsize (fdt_blob));

	/* move flattend device tree if needed */
	if (relocate) {
		int err;
		ulong of_start;

		/* position on a 4K boundary before the alloc_current */
		of_start = (unsigned long)lmb_alloc_base(lmb, of_len, 0x1000,
					 (CFG_BOOTMAPSZ + bootmap_base));

		if (of_start == 0) {
			puts("device tree - allocation error\n");
			goto error;
		}

		debug ("## device tree at 0x%08lX ... 0x%08lX (len=%ld=0x%lX)\n",
			(ulong)fdt_blob, (ulong)fdt_blob + of_len - 1,
			of_len, of_len);

		printf ("   Loading Device Tree to %08lx, end %08lx ... ",
			of_start, of_start + of_len - 1);

		err = fdt_open_into (fdt_blob, (void *)of_start, of_len);
		if (err != 0) {
			fdt_error ("fdt move failed");
			goto error;
		}
		puts ("OK\n");

		*of_flat_tree = (char *)of_start;
	} else {
		*of_flat_tree = fdt_blob;
		lmb_reserve(lmb, (ulong)working_fdt, of_len);
	}

	return 0;

error:
	return 1;
}
#endif