/*
 * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu>
 * Copyright (C) 2007-2009 PetaLogix
 * Copyright (C) 2006 Atmark Techno, Inc.
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License. See the file "COPYING" in the main directory of this archive
 * for more details.
 */

#include <linux/init.h>
#include <linux/string.h>
#include <linux/seq_file.h>
#include <linux/cpu.h>
#include <linux/initrd.h>
#include <linux/console.h>
#include <linux/debugfs.h>

#include <asm/setup.h>
#include <asm/sections.h>
#include <asm/page.h>
#include <linux/io.h>
#include <linux/bug.h>
#include <linux/param.h>
#include <linux/cache.h>
#include <asm/cacheflush.h>
#include <asm/entry.h>
#include <asm/cpuinfo.h>

#include <asm/system.h>
#include <asm/prom.h>
#include <asm/pgtable.h>

DEFINE_PER_CPU(unsigned int, KSP);	/* Saved kernel stack pointer */
DEFINE_PER_CPU(unsigned int, KM);	/* Kernel/user mode */
DEFINE_PER_CPU(unsigned int, ENTRY_SP);	/* Saved SP on kernel entry */
DEFINE_PER_CPU(unsigned int, R11_SAVE);	/* Temp variable for entry */
DEFINE_PER_CPU(unsigned int, CURRENT_SAVE);	/* Saved current pointer */

unsigned int boot_cpuid;
char cmd_line[COMMAND_LINE_SIZE];

void __init setup_arch(char **cmdline_p)
{
	*cmdline_p = cmd_line;

	console_verbose();

	unflatten_device_tree();

	/* NOTE I think that this function is not necessary to call */
	/* irq_early_init(); */
	setup_cpuinfo();

	microblaze_cache_init();

	enable_dcache();

	invalidate_icache();
	enable_icache();

	setup_memory();

#if defined(CONFIG_SELFMOD_INTC) || defined(CONFIG_SELFMOD_TIMER)
	printk(KERN_NOTICE "Self modified code enable\n");
#endif

#ifdef CONFIG_VT
#if defined(CONFIG_XILINX_CONSOLE)
	conswitchp = &xil_con;
#elif defined(CONFIG_DUMMY_CONSOLE)
	conswitchp = &dummy_con;
#endif
#endif
}

#ifdef CONFIG_MTD_UCLINUX
/* Handle both romfs and cramfs types, without generating unnecessary
 code (ie no point checking for CRAMFS if it's not even enabled) */
inline unsigned get_romfs_len(unsigned *addr)
{
#ifdef CONFIG_ROMFS_FS
	if (memcmp(&addr[0], "-rom1fs-", 8) == 0) /* romfs */
		return be32_to_cpu(addr[2]);
#endif

#ifdef CONFIG_CRAMFS
	if (addr[0] == le32_to_cpu(0x28cd3d45)) /* cramfs */
		return le32_to_cpu(addr[1]);
#endif
	return 0;
}
#endif	/* CONFIG_MTD_UCLINUX_EBSS */

void __init machine_early_init(const char *cmdline, unsigned int ram,
		unsigned int fdt, unsigned int msr)
{
	unsigned long *src, *dst = (unsigned long *)0x0;

	/* If CONFIG_MTD_UCLINUX is defined, assume ROMFS is at the
	 * end of kernel. There are two position which we want to check.
	 * The first is __init_end and the second __bss_start.
	 */
#ifdef CONFIG_MTD_UCLINUX
	int romfs_size;
	unsigned int romfs_base;
	char *old_klimit = klimit;

	romfs_base = (ram ? ram : (unsigned int)&__init_end);
	romfs_size = PAGE_ALIGN(get_romfs_len((unsigned *)romfs_base));
	if (!romfs_size) {
		romfs_base = (unsigned int)&__bss_start;
		romfs_size = PAGE_ALIGN(get_romfs_len((unsigned *)romfs_base));
	}

	/* Move ROMFS out of BSS before clearing it */
	if (romfs_size > 0) {
		memmove(&_ebss, (int *)romfs_base, romfs_size);
		klimit += romfs_size;
	}
#endif

/* clearing bss section */
	memset(__bss_start, 0, __bss_stop-__bss_start);
	memset(_ssbss, 0, _esbss-_ssbss);

	/* Copy command line passed from bootloader */
#ifndef CONFIG_CMDLINE_BOOL
	if (cmdline && cmdline[0] != '\0')
		strlcpy(cmd_line, cmdline, COMMAND_LINE_SIZE);
#endif

	lockdep_init();

/* initialize device tree for usage in early_printk */
	early_init_devtree((void *)_fdt_start);

#ifdef CONFIG_EARLY_PRINTK
	setup_early_printk(NULL);
#endif

	early_printk("Ramdisk addr 0x%08x, ", ram);
	if (fdt)
		early_printk("FDT at 0x%08x\n", fdt);
	else
		early_printk("Compiled-in FDT at 0x%08x\n",
					(unsigned int)_fdt_start);

#ifdef CONFIG_MTD_UCLINUX
	early_printk("Found romfs @ 0x%08x (0x%08x)\n",
			romfs_base, romfs_size);
	early_printk("#### klimit %p ####\n", old_klimit);
	BUG_ON(romfs_size < 0); /* What else can we do? */

	early_printk("Moved 0x%08x bytes from 0x%08x to 0x%08x\n",
			romfs_size, romfs_base, (unsigned)&_ebss);

	early_printk("New klimit: 0x%08x\n", (unsigned)klimit);
#endif

#if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR
	if (msr)
		early_printk("!!!Your kernel has setup MSR instruction but "
				"CPU don't have it %d\n", msr);
#else
	if (!msr)
		early_printk("!!!Your kernel not setup MSR instruction but "
				"CPU have it %d\n", msr);
#endif

	for (src = __ivt_start; src < __ivt_end; src++, dst++)
		*dst = *src;

	/* Initialize global data */
	per_cpu(KM, 0) = 0x1;	/* We start in kernel mode */
	per_cpu(CURRENT_SAVE, 0) = (unsigned long)current;
}

#ifdef CONFIG_DEBUG_FS
struct dentry *of_debugfs_root;

static int microblaze_debugfs_init(void)
{
	of_debugfs_root = debugfs_create_dir("microblaze", NULL);

	return of_debugfs_root == NULL;
}
arch_initcall(microblaze_debugfs_init);
#endif