path: root/lib_arm/armlinux.c

/*
 * (C) Copyright 2002
 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
 * Marius Groeger <mgroeger@sysgo.de>
 *
 * Copyright (C) 2001  Erik Mouw (J.A.K.Mouw@its.tudelft.nl)
 *
 * Copyright (c) 2008 WonderMedia Technologies, Inc.
 *
 * 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, see <http://www.gnu.org/licenses/>.
 *
 * WonderMedia Technologies, Inc.
 * 10F, 529, Chung-Cheng Road, Hsin-Tien, Taipei 231, R.O.C.
 */

#include <common.h>
#include <command.h>
#include <image.h>
#include <zlib.h>
#include <asm/byteorder.h>
#ifdef CONFIG_HAS_DATAFLASH
#include <dataflash.h>
#endif

DECLARE_GLOBAL_DATA_PTR;

/* cmd_boot.c*/
extern int do_reset(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]);

#if defined(CONFIG_SETUP_MEMORY_TAGS) || \
    defined(CONFIG_CMDLINE_TAG) || \
    defined(CONFIG_INITRD_TAG) || \
    defined(CONFIG_SERIAL_TAG) || \
    defined(CONFIG_REVISION_TAG) || \
    defined(CONFIG_VFD) || \
    defined(CONFIG_LCD)
static void setup_start_tag(bd_t *bd);

# ifdef CONFIG_SETUP_MEMORY_TAGS
static void setup_memory_tags(bd_t *bd);
# endif
static void setup_commandline_tag(bd_t *bd, char *commandline);

#if 0
static void setup_ramdisk_tag(bd_t *bd);
#endif
# ifdef CONFIG_INITRD_TAG
static void setup_initrd_tag(bd_t *bd, ulong initrd_start,
			      ulong initrd_end);
# endif
static void setup_end_tag(bd_t *bd);

# if defined(CONFIG_VFD) || defined(CONFIG_LCD)
static void setup_videolfb_tag(gd_t *gd);
# endif


static struct tag *params;
#endif /* CONFIG_SETUP_MEMORY_TAGS || CONFIG_CMDLINE_TAG || CONFIG_INITRD_TAG */

#ifdef CONFIG_SHOW_BOOT_PROGRESS
# include <status_led.h>
# define SHOW_BOOT_PROGRESS(arg)	show_boot_progress(arg)
#else
# define SHOW_BOOT_PROGRESS(arg)
#endif

#if defined(CONFIG_WMT) && defined(CONFIG_ZDE_KERNEL_DEBUG)
extern void semi_bootloados(void);
#endif

extern image_header_t header;	/* from cmd_bootm.c */


void do_bootm_linux(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[],
		     ulong addr, ulong *len_ptr, int verify)
{
	ulong len = 0, checksum;
	ulong initrd_start, initrd_end;
	ulong data;
	void(*theKernel)(int zero, int arch, uint params);
	image_header_t *hdr = &header;
	bd_t *bd = gd->bd;

#ifdef CONFIG_CMDLINE_TAG
	char *commandline = getenv("bootargs");
#endif

	theKernel = (void(*)(int, int, uint))ntohl(hdr->ih_ep);

	/*
	 * Check if there is an initrd image
	 */
	if (argc >= 3) {
		SHOW_BOOT_PROGRESS(9);

		addr = simple_strtoul(argv[2], NULL, 16);

		printf("## Loading Ramdisk Image at %08lx ...\n", addr);

		/* Copy header so we can blank CRC field for re-calculation */
#ifdef CONFIG_HAS_DATAFLASH
		if (addr_dataflash(addr)) {
			read_dataflash(addr, sizeof(image_header_t),
					(char *) &header);
		} else
#endif
			memcpy(&header, (char *) addr,
				sizeof(image_header_t));

		if (ntohl(hdr->ih_magic) != IH_MAGIC) {
			printf("Bad Magic Number\n");
			SHOW_BOOT_PROGRESS(-10);
			do_reset(cmdtp, flag, argc, argv);
		}

		data = (ulong)&header;
		len = sizeof(image_header_t);

		checksum = ntohl(hdr->ih_hcrc);
		hdr->ih_hcrc = 0;

		if (crc32(0, (const Bytef *)data, len) != checksum) {
			printf("Bad Header Checksum\n");
			SHOW_BOOT_PROGRESS(-11);
			do_reset(cmdtp, flag, argc, argv);
		}

		SHOW_BOOT_PROGRESS(10);

		print_image_hdr(hdr);

		data = addr + sizeof(image_header_t);
		len = ntohl(hdr->ih_size);

#ifdef CONFIG_HAS_DATAFLASH
		if (addr_dataflash(addr)) {
			read_dataflash(data, len, (char *) CFG_LOAD_ADDR);
			data = CFG_LOAD_ADDR;
		}
#endif

		if (verify) {
			ulong csum = 0;

			printf("   Verifying Checksum ... ");
			csum = crc32(0, (const Bytef *)data, len);
			if (csum != ntohl(hdr->ih_dcrc)) {
				printf("Bad Data CRC\n");
				SHOW_BOOT_PROGRESS(-12);
				do_reset(cmdtp, flag, argc, argv);
			}
			printf("OK\n");
		}

		SHOW_BOOT_PROGRESS(11);

		if ((hdr->ih_os != IH_OS_LINUX) ||
		    (hdr->ih_arch != IH_CPU_ARM) ||
		    (hdr->ih_type != IH_TYPE_RAMDISK)) {
			printf("No Linux ARM Ramdisk Image\n");
			SHOW_BOOT_PROGRESS(-13);
			do_reset(cmdtp, flag, argc, argv);
		}

#if defined(CONFIG_B2) || defined(CONFIG_EVB4510) || defined(CONFIG_ARMADILLO)
		/*
		 *we need to copy the ramdisk to SRAM to let Linux boot
		 */
		memmove((void *) ntohl(hdr->ih_load), (uchar *)data, len);
		data = ntohl(hdr->ih_load);
#endif /* CONFIG_B2 || CONFIG_EVB4510 */

		/*
		 * Now check if we have a multifile image
		 */
	} else if ((hdr->ih_type == IH_TYPE_MULTI) && (len_ptr[1])) {
		ulong tail = ntohl(len_ptr[0]) % 4;
		int i;

		SHOW_BOOT_PROGRESS(13);

		/* skip kernel length and terminator */
		data = (ulong)(&len_ptr[2]);
		/* skip any additional image length fields */
		for (i = 1; len_ptr[i]; ++i)
			data += 4;
		/* add kernel length, and align */
		data += ntohl(len_ptr[0]);
		if (tail)
			data += 4 - tail;

		len = ntohl(len_ptr[1]);

	} else {
		/*
		 * no initrd image
		 */
		SHOW_BOOT_PROGRESS(14);

		len = data = 0;
	}

#ifdef	DEBUG
	if (!data)
		printf("No initrd\n");
#endif

	if (data) {
		initrd_start = data;
		initrd_end = initrd_start + len;
	} else {
		initrd_start = 0;
		initrd_end = 0;
	}

	SHOW_BOOT_PROGRESS(15);

#if defined(CONFIG_WMT) && defined(CONFIG_ZDE_KERNEL_DEBUG)

	char *s;
	int ch;

	s = getenv("zdekerneldebug");

	if ((s != NULL) && (strcmp(s, "yes") == 0)) {
	#if defined(CONFIG_SETUP_MEMORY_TAGS) || \
	    defined(CONFIG_CMDLINE_TAG) || \
	    defined(CONFIG_INITRD_TAG) || \
	    defined(CONFIG_SERIAL_TAG) || \
	    defined(CONFIG_REVISION_TAG) || \
	    defined(CONFIG_LCD) || \
	    defined(CONFIG_VFD)
		setup_start_tag(bd);
	#ifdef CONFIG_SERIAL_TAG
		setup_serial_tag(&params);
	#endif
	#ifdef CONFIG_REVISION_TAG
		setup_revision_tag(&params);
	#endif
	#ifdef CONFIG_SETUP_MEMORY_TAGS
		setup_memory_tags(bd);
	#endif
	#ifdef CONFIG_CMDLINE_TAG
		setup_commandline_tag(bd, commandline);
	#endif
	#ifdef CONFIG_INITRD_TAG
		if (initrd_start && initrd_end)
			setup_initrd_tag(bd, initrd_start, initrd_end);
	#endif
	#if defined(CONFIG_VFD) || defined(CONFIG_LCD)
		setup_videolfb_tag((gd_t *) gd);
	#endif
		setup_end_tag(bd);
	#endif

	#ifdef CONFIG_USB_DEVICE
		{
			extern void udc_disconnect(void);
			udc_disconnect();
		}
	#endif

		cleanup_before_linux();

		printf("Jump to kernel directly without ZDE debug support ? [y/n]\n");
		printf("Input: ");
		ch = getc();
		if (ch == 'n' || ch == 'N')
			semi_bootloados();
		else {
			printf("\n");
			cleanup_before_linux();
			theKernel(0, bd->bi_arch_number, bd->bi_boot_params);
		}
	}

	udelay(1000);

#endif /* CONFIG_WMT && CONFIG_ZDE_KERNEL_DEBUG */


	debug("## Transferring control to Linux (at address %08lx) ...\n",
	       (ulong) theKernel);

#if defined(CONFIG_SETUP_MEMORY_TAGS) || \
    defined(CONFIG_CMDLINE_TAG) || \
    defined(CONFIG_INITRD_TAG) || \
    defined(CONFIG_SERIAL_TAG) || \
    defined(CONFIG_REVISION_TAG) || \
    defined(CONFIG_LCD) || \
    defined(CONFIG_VFD)
	setup_start_tag(bd);
#ifdef CONFIG_SERIAL_TAG
	setup_serial_tag(&params);
#endif
#ifdef CONFIG_REVISION_TAG
	setup_revision_tag(&params);
#endif
#ifdef CONFIG_SETUP_MEMORY_TAGS
	setup_memory_tags(bd);
#endif
#ifdef CONFIG_CMDLINE_TAG
	setup_commandline_tag(bd, commandline);
#endif
#ifdef CONFIG_INITRD_TAG
	if (initrd_start && initrd_end)
		setup_initrd_tag(bd, initrd_start, initrd_end);
#endif
#if defined(CONFIG_VFD) || defined(CONFIG_LCD)
	setup_videolfb_tag((gd_t *) gd);
#endif
	setup_end_tag(bd);
#endif

	/* we assume that the kernel is in place */
	printf("\nStarting kernel ...\n\n");

#ifdef CONFIG_USB_DEVICE
	{
		extern void udc_disconnect(void);
		udc_disconnect();
	}
#endif

	s = getenv("kerneldebug");
	if ((s != NULL) && (strcmp(s, "yes") == 0)) {
		printf("Jump to kernel directly without kernel debug support ? [y/n]\n");
		printf("Input: ");
		ch = getc();
		if (ch == 'n' || ch == 'N') {
			printf("Please load the symbol with ICE\n");
			cleanup_before_linux();
			asm volatile("mov 	r0,#0x0");
			/* bd->bi_arch_number */
			asm volatile("mov 	r1,#0x2d8");
			/* bd->bd->bi_boot_params */
			asm volatile("mov 	r2,#0x0");
			while (1)
				;
		}
	}

	cleanup_before_linux();
	theKernel(0, bd->bi_arch_number, bd->bi_boot_params);
}


#if defined(CONFIG_SETUP_MEMORY_TAGS) || \
    defined(CONFIG_CMDLINE_TAG) || \
    defined(CONFIG_INITRD_TAG) || \
    defined(CONFIG_SERIAL_TAG) || \
    defined(CONFIG_REVISION_TAG) || \
    defined(CONFIG_LCD) || \
    defined(CONFIG_VFD)
static void setup_start_tag(bd_t *bd)
{
	params = (struct tag *) bd->bi_boot_params;

	params->hdr.tag = ATAG_CORE;
	params->hdr.size = tag_size(tag_core);

	params->u.core.flags = 0;
	params->u.core.pagesize = 0;
	params->u.core.rootdev = 0;

	params = tag_next(params);
}


#ifdef CONFIG_SETUP_MEMORY_TAGS
static void setup_memory_tags(bd_t *bd)
{
	int i;

	for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
		params->hdr.tag = ATAG_MEM;
		params->hdr.size = tag_size(tag_mem32);

		params->u.mem.start = bd->bi_dram[i].start;
		params->u.mem.size = bd->bi_dram[i].size;

		params = tag_next(params);
	}
}
#endif /* CONFIG_SETUP_MEMORY_TAGS */


static void setup_commandline_tag(bd_t *bd, char *commandline)
{
	char *p;

	if (!commandline)
		return;

	/* eat leading white space */
	for (p = commandline; *p == ' '; p++)
		;

	/* skip non-existent command lines so the kernel will still
	 * use its default command line.
	 */
	if (*p == '\0')
		return;

	params->hdr.tag = ATAG_CMDLINE;
	params->hdr.size =
		(sizeof(struct tag_header) + strlen(p) + 1 + 4) >> 2;

	strcpy(params->u.cmdline.cmdline, p);

	params = tag_next(params);
}


#ifdef CONFIG_INITRD_TAG
static void setup_initrd_tag(bd_t *bd, ulong initrd_start, ulong initrd_end)
{
	/* an ATAG_INITRD node tells the kernel where the compressed
	 * ramdisk can be found. ATAG_RDIMG is a better name, actually.
	 */
	params->hdr.tag = ATAG_INITRD2;
	params->hdr.size = tag_size(tag_initrd);

	params->u.initrd.start = initrd_start;
	params->u.initrd.size = initrd_end - initrd_start;

	params = tag_next(params);
}
#endif /* CONFIG_INITRD_TAG */


#if defined(CONFIG_VFD) || defined(CONFIG_LCD)
extern ulong calc_fbsize(void);
static void setup_videolfb_tag(gd_t *gd)
{
	/* An ATAG_VIDEOLFB node tells the kernel where and how large
	 * the framebuffer for video was allocated (among other things).
	 * Note that a _physical_ address is passed !
	 *
	 * We only use it to pass the address and size, the other entries
	 * in the tag_videolfb are not of interest.
	 */
	params->hdr.tag = ATAG_VIDEOLFB;
	params->hdr.size = tag_size(tag_videolfb);

	params->u.videolfb.lfb_base = (u32) gd->fb_base;
	/* Fb size is calculated according to parameters for our panel
	 */
	params->u.videolfb.lfb_size = calc_fbsize();

	params = tag_next(params);
}
#endif /* CONFIG_VFD || CONFIG_LCD */

#ifdef CONFIG_SERIAL_TAG
void setup_serial_tag(struct tag **tmp)
{
	struct tag *params = *tmp;
	struct tag_serialnr serialnr;
	void get_board_serial(struct tag_serialnr *serialnr);

	get_board_serial(&serialnr);
	params->hdr.tag = ATAG_SERIAL;
	params->hdr.size = tag_size(tag_serialnr);
	params->u.serialnr.low = serialnr.low;
	params->u.serialnr.high = serialnr.high;
	params = tag_next(params);
	*tmp = params;
}
#endif

#ifdef CONFIG_REVISION_TAG
void setup_revision_tag(struct tag **in_params)
{
	u32 rev = 0;
	u32 get_board_rev(void);

	rev = get_board_rev();
	params->hdr.tag = ATAG_REVISION;
	params->hdr.size = tag_size(tag_revision);
	params->u.revision.rev = rev;
	params = tag_next(params);
}
#endif  /* CONFIG_REVISION_TAG */


static void setup_end_tag(bd_t *bd)
{
	params->hdr.tag = ATAG_NONE;
	params->hdr.size = 0;
}

#endif /* CONFIG_SETUP_MEMORY_TAGS || CONFIG_CMDLINE_TAG || CONFIG_INITRD_TAG */