openwrt-xburst/target/linux/xburst/files-2.6.31/arch/mips/jz4740/prom.c

/*
 *
 * BRIEF MODULE DESCRIPTION
 *    PROM library initialisation code, supports YAMON and U-Boot.
 *
 * Copyright 2000, 2001, 2006 MontaVista Software Inc.
 * Author: MontaVista Software, Inc.
 *         	ppopov@mvista.com or source@mvista.com
 *
 * This file was derived from Carsten Langgaard's
 * arch/mips/mips-boards/xx files.
 *
 * Carsten Langgaard, carstenl@mips.com
 * Copyright (C) 1999,2000 MIPS Technologies, Inc.  All rights reserved.
 *
 *  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  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
 *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
 *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
 *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
 *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
 *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *  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.,
 *  675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/string.h>

#include <asm/bootinfo.h>
#include <asm/mach-jz4740/regs.h>

/* #define DEBUG_CMDLINE */

int prom_argc;
char **prom_argv, **prom_envp;

char *prom_getcmdline(void)
{
	return &(arcs_cmdline[0]);
}

void prom_init_cmdline(void)
{
	char *cp, *c;
	size_t i = 1;

	cp = &(arcs_cmdline[0]);
	while(i < prom_argc) {
		c = prom_argv[i];
		while (*c) {
			*cp++ = *c++;
		}
		*cp++ = ' ';
		i++;
	}
	if (i > 1) {
		*(cp - 1) = '\0';
	}

}

void __init prom_init(void)
{
	unsigned long memsize;

	prom_argc = (int) fw_arg0;
	prom_argv = (char **) fw_arg1;
	prom_envp = (char **) fw_arg2;

	mips_machtype = MACH_INGENIC_JZ4740;

	prom_init_cmdline();
	memsize = 0x04000000;
	add_memory_region(0, memsize, BOOT_MEM_RAM);
}

void __init prom_free_prom_memory(void)
{
}

/* used by early printk */
void prom_putchar(char c)
{
	volatile u8 *uart_lsr = (volatile u8 *)(UART0_BASE + OFF_LSR);
	volatile u8 *uart_tdr = (volatile u8 *)(UART0_BASE + OFF_TDR);

	/* Wait for fifo to shift out some bytes */
	while ( !((*uart_lsr & (UARTLSR_TDRQ | UARTLSR_TEMT)) == 0x60) );

	*uart_tdr = (u8)c;
}

const char *get_system_type(void)
{
	return "JZ4740";
}

EXPORT_SYMBOL(prom_getcmdline);