openwrt-xburst/target/linux/adm5120-2.6/files/arch/mips/adm5120/prom.c

/*****************************************************************************
 * Carsten Langgaard, carstenl@mips.com
 * Copyright (C) 1999,2000 MIPS Technologies, Inc.  All rights reserved.
 * Copyright (C) 2003 ADMtek Incorporated.
 *	daniell@admtek.com.tw
 * Copyright (C) 2007 OpenWrt.org
 *
 *  This program is free software; you can distribute it and/or modify it
 *  under the terms of the GNU General Public License (Version 2) as
 *  published by the Free Software Foundation.
 *
 *  This program is distributed in the hope 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 <linux/init.h>
#include <linux/autoconf.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/bootmem.h>

#include <asm/bootinfo.h>
#include <asm/addrspace.h>

#include <asm/mach-adm5120/adm5120_info.h>

static char **prom_envp = NULL;

void setup_prom_printf(int);
void prom_printf(char *, ...);
void prom_meminit(void);


#define READCSR(r)      *(volatile unsigned long *)(0xB2600000+(r))
#define WRITECSR(r,v)   *(volatile unsigned long *)(0xB2600000+(r)) = v

#define UART_DR_REG         0x00
#define UART_FR_REG         0x18
#define UART_TX_FIFO_FULL   0x20

int putPromChar(char c)
{
	WRITECSR(UART_DR_REG, c);
        while ( (READCSR(UART_FR_REG) & UART_TX_FIFO_FULL) );
        return 0;
}

/*
 * Ugly prom_printf used for debugging
 */

void prom_printf(char *fmt, ...)
{
        va_list args;
        int l;
        char *p, *buf_end;
        char buf[1024];

        va_start(args, fmt);
        l = vsprintf(buf, fmt, args); /* hopefully i < sizeof(buf) */
        va_end(args);

        buf_end = buf + l;

        for (p = buf; p < buf_end; p++) {
                /* Crude cr/nl handling is better than none */
                if (*p == '\n')
                        putPromChar('\r');
                putPromChar(*p);
        }
}

char *prom_getenv(char *envname)
{
	char **env;
	char *ret;

	ret = NULL;

	if (prom_envp== NULL)
		return NULL;

	for (env = prom_envp; *env != NULL; env++) {
		if (strcmp(envname, *env++) == 0) {
			ret = *env;
			break;
		}
	}

	return ret;
}

extern char _image_cmdline;
/*
 * initialize the prom module.
 */
void __init prom_init(void)
{
	char *cmd;

	if ((fw_arg2 & 3) == 0) {
		prom_envp = (char **)fw_arg2;
	}

	adm5120_info_init();

	/* you should these macros defined in include/asm/bootinfo.h */
	mips_machgroup = MACH_GROUP_ADM5120;
	mips_machtype = adm5120_board.mach_type;

	/* init command line, register a default kernel command line */
	cmd = &_image_cmdline + 8;
	if( strlen(cmd) > 0) strcpy( &(arcs_cmdline[0]), cmd);
		else strcpy(&(arcs_cmdline[0]), CONFIG_CMDLINE);

	/* init memory map */
	prom_meminit();
}