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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/mips/sgi-ip32/ip32-setup.c
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/*

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 * IP32 basic setup

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 *

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 * This file is subject to the terms and conditions of the GNU General Public

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 * License.  See the file "COPYING" in the main directory of this archive

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 * for more details.

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 *

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 * Copyright (C) 2000 Harald Koerfgen

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 * Copyright (C) 2002, 2003, 2005 Ilya A. Volynets

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 * Copyright (C) 2006 Ralf Baechle <[email protected]>

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 */

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#include <linux/console.h>

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#include <linux/init.h>

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#include <linux/interrupt.h>

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#include <linux/param.h>

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#include <linux/sched.h>

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#include <asm/bootinfo.h>

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#include <asm/mipsregs.h>

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#include <asm/mmu_context.h>

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#include <asm/sgialib.h>

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#include <asm/time.h>

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#include <asm/traps.h>

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#include <asm/io.h>

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#include <asm/ip32/crime.h>

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#include <asm/ip32/mace.h>

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#include <asm/ip32/ip32_ints.h>

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#include "ip32-common.h"

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#ifdef CONFIG_SGI_O2MACE_ETH

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/*

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 * This is taken care of in here 'cause they say using Arc later on is

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 * problematic

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 */

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extern char o2meth_eaddr[8];

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static inline unsigned char str2hexnum(unsigned char c)

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{

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	if (c >= '0' && c <= '9')

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		return c - '0';

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	if (c >= 'a' && c <= 'f')

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		return c - 'a' + 10;

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	return 0; /* foo */

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}

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static inline void str2eaddr(unsigned char *ea, unsigned char *str)

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{

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	int i;

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	for (i = 0; i < 6; i++) {

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		unsigned char num;

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		if(*str == ':')

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			str++;

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		num = str2hexnum(*str++) << 4;

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		num |= (str2hexnum(*str++));

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		ea[i] = num;

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	}

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}

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#endif

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/* An arbitrary time; this can be decreased if reliability looks good */

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#define WAIT_MS 10

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void __init plat_time_init(void)

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{

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	printk(KERN_INFO "Calibrating system timer... ");

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	write_c0_count(0);

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	crime->timer = 0;

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	while (crime->timer < CRIME_MASTER_FREQ * WAIT_MS / 1000) ;

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	mips_hpt_frequency = read_c0_count() * 1000 / WAIT_MS;

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	printk("%d MHz CPU detected\n", mips_hpt_frequency * 2 / 1000000);

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}

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void __init plat_mem_setup(void)

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{

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	board_be_init = ip32_be_init;

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#ifdef CONFIG_SGI_O2MACE_ETH

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	{

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		char *mac = ArcGetEnvironmentVariable("eaddr");

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		str2eaddr(o2meth_eaddr, mac);

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	}

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#endif

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#if defined(CONFIG_SERIAL_CORE_CONSOLE)

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	{

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		char* con = ArcGetEnvironmentVariable("console");

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		if (con && *con == 'd') {

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			static char options[8] __initdata;

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			char *baud = ArcGetEnvironmentVariable("dbaud");

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			if (baud)

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				strcpy(options, baud);

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			add_preferred_console("ttyS", *(con + 1) == '2' ? 1 : 0,

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					      baud ? options : NULL);

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		}

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	}

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#endif

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}

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