[mirror_ubuntu-zesty-kernel.git] / arch / mips / powertv / init.c

/*
 * Copyright (C) 1999, 2000, 2004, 2005	 MIPS Technologies, Inc.
 *	All rights reserved.
 *	Authors: Carsten Langgaard <carstenl@mips.com>
 *		 Maciej W. Rozycki <macro@mips.com>
 * Portions copyright (C) 2009 Cisco Systems, Inc.
 *
 *  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.
 *
 * PROM library initialisation code.
 */
#include <linux/init.h>
#include <linux/string.h>
#include <linux/kernel.h>

#include <asm/bootinfo.h>
#include <linux/io.h>
#include <asm/cacheflush.h>
#include <asm/traps.h>

#include <asm/mips-boards/prom.h>
#include <asm/mips-boards/generic.h>
#include <asm/mach-powertv/asic.h>

static int *_prom_envp;
unsigned long _prom_memsize;

/*
 * YAMON (32-bit PROM) pass arguments and environment as 32-bit pointer.
 * This macro take care of sign extension, if running in 64-bit mode.
 */
#define prom_envp(index) ((char *)(long)_prom_envp[(index)])

char *prom_getenv(char *envname)
{
	char *result = NULL;

	if (_prom_envp != NULL) {
		/*
		 * Return a pointer to the given environment variable.
		 * In 64-bit mode: we're using 64-bit pointers, but all pointers
		 * in the PROM structures are only 32-bit, so we need some
		 * workarounds, if we are running in 64-bit mode.
		 */
		int i, index = 0;

		i = strlen(envname);

		while (prom_envp(index)) {
			if (strncmp(envname, prom_envp(index), i) == 0) {
				result = prom_envp(index + 1);
				break;
			}
			index += 2;
		}
	}

	return result;
}

void __init prom_init(void)
{
	int prom_argc;
	char *prom_argv;

	prom_argc = fw_arg0;
	prom_argv = (char *) fw_arg1;
	_prom_envp = (int *) fw_arg2;
	_prom_memsize = (unsigned long) fw_arg3;

	if (prom_argc == 1) {
		strlcat(arcs_cmdline, " ", COMMAND_LINE_SIZE);
		strlcat(arcs_cmdline, prom_argv, COMMAND_LINE_SIZE);
	}

	configure_platform();
	prom_meminit();

#ifndef CONFIG_BOOTLOADER_DRIVER
	pr_info("\nBootloader driver isn't loaded...\n");
#endif
}
Commit	Line	Data
a3a0f8c8	1	/*
70342287	2	* Copyright (C) 1999, 2000, 2004, 2005 MIPS Technologies, Inc.
a3a0f8c8 DV	3	* All rights reserved.
	4	* Authors: Carsten Langgaard <carstenl@mips.com>
	5	* Maciej W. Rozycki <macro@mips.com>
	6	* Portions copyright (C) 2009 Cisco Systems, Inc.
	7	*
	8	* This program is free software; you can distribute it and/or modify it
	9	* under the terms of the GNU General Public License (Version 2) as
	10	* published by the Free Software Foundation.
	11	*
	12	* This program is distributed in the hope it will be useful, but WITHOUT
	13	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	14	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	15	* for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License along
	18	* with this program; if not, write to the Free Software Foundation, Inc.,
	19	* 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
	20	*
	21	* PROM library initialisation code.
	22	*/
	23	#include <linux/init.h>
	24	#include <linux/string.h>
	25	#include <linux/kernel.h>
	26
	27	#include <asm/bootinfo.h>
	28	#include <linux/io.h>
a3a0f8c8 DV	29	#include <asm/cacheflush.h>
	30	#include <asm/traps.h>
	31
	32	#include <asm/mips-boards/prom.h>
	33	#include <asm/mips-boards/generic.h>
	34	#include <asm/mach-powertv/asic.h>
	35
7e326d68	36	static int *_prom_envp;
a3a0f8c8 DV	37	unsigned long _prom_memsize;
	38
	39	/*
	40	* YAMON (32-bit PROM) pass arguments and environment as 32-bit pointer.
	41	* This macro take care of sign extension, if running in 64-bit mode.
	42	*/
	43	#define prom_envp(index) ((char *)(long)_prom_envp[(index)])
	44
	45	char prom_getenv(char envname)
	46	{
	47	char *result = NULL;
	48
	49	if (_prom_envp != NULL) {
	50	/*
	51	* Return a pointer to the given environment variable.
	52	* In 64-bit mode: we're using 64-bit pointers, but all pointers
	53	* in the PROM structures are only 32-bit, so we need some
	54	* workarounds, if we are running in 64-bit mode.
	55	*/
	56	int i, index = 0;
	57
	58	i = strlen(envname);
	59
	60	while (prom_envp(index)) {
	61	if (strncmp(envname, prom_envp(index), i) == 0) {
	62	result = prom_envp(index + 1);
	63	break;
	64	}
	65	index += 2;
	66	}
	67	}
	68
	69	return result;
	70	}
	71
a3a0f8c8 DV	72	void __init prom_init(void)
a3a0f8c8 DV	73	{
7e326d68 YY	74	int prom_argc;
	75	char *prom_argv;
	76
a3a0f8c8	77	prom_argc = fw_arg0;
7e326d68	78	prom_argv = (char *) fw_arg1;
a3a0f8c8 DV	79	_prom_envp = (int *) fw_arg2;
	80	_prom_memsize = (unsigned long) fw_arg3;
	81
0d590504 DV	82	if (prom_argc == 1) {
0d590504 DV	83	strlcat(arcs_cmdline, " ", COMMAND_LINE_SIZE);
7e326d68	84	strlcat(arcs_cmdline, prom_argv, COMMAND_LINE_SIZE);
0d590504	85	}
7e326d68	86
a3a0f8c8 DV	87	configure_platform();
	88	prom_meminit();
	89
	90	#ifndef CONFIG_BOOTLOADER_DRIVER
	91	pr_info("\nBootloader driver isn't loaded...\n");
	92	#endif
	93	}