ip32-setup.c

  1/*
  2 * IP32 basic setup
  3 *
  4 * This file is subject to the terms and conditions of the GNU General Public
  5 * License.  See the file "COPYING" in the main directory of this archive
  6 * for more details.
  7 *
  8 * Copyright (C) 2000 Harald Koerfgen
  9 * Copyright (C) 2002, 2003, 2005 Ilya A. Volynets
 10 * Copyright (C) 2006 Ralf Baechle <ralf@linux-mips.org>
 11 */
 12#include <linux/console.h>
 13#include <linux/init.h>
 14#include <linux/interrupt.h>
 15#include <linux/param.h>
 16#include <linux/sched.h>
 17#include <linux/string.h>
 18
 19#include <asm/bootinfo.h>
 20#include <asm/mipsregs.h>
 21#include <asm/mmu_context.h>
 22#include <asm/sgialib.h>
 23#include <asm/time.h>
 24#include <asm/traps.h>
 25#include <asm/io.h>
 26#include <asm/ip32/crime.h>
 27#include <asm/ip32/mace.h>
 28#include <asm/ip32/ip32_ints.h>
 29
 30#include "ip32-common.h"
 31
 32#ifdef CONFIG_SGI_O2MACE_ETH
 33/*
 34 * This is taken care of in here 'cause they say using Arc later on is
 35 * problematic
 36 */
 37extern char o2meth_eaddr[8];
 38static inline unsigned char str2hexnum(unsigned char c)
 39{
 40	if (c >= '0' && c <= '9')
 41		return c - '0';
 42	if (c >= 'a' && c <= 'f')
 43		return c - 'a' + 10;
 44	return 0; /* foo */
 45}
 46
 47static inline void str2eaddr(unsigned char *ea, unsigned char *str)
 48{
 49	int i;
 50
 51	for (i = 0; i < 6; i++) {
 52		unsigned char num;
 53
 54		if(*str == ':')
 55			str++;
 56		num = str2hexnum(*str++) << 4;
 57		num |= (str2hexnum(*str++));
 58		ea[i] = num;
 59	}
 60}
 61#endif
 62
 63/* An arbitrary time; this can be decreased if reliability looks good */
 64#define WAIT_MS 10
 65
 66void __init plat_time_init(void)
 67{
 68	printk(KERN_INFO "Calibrating system timer... ");
 69	write_c0_count(0);
 70	crime->timer = 0;
 71	while (crime->timer < CRIME_MASTER_FREQ * WAIT_MS / 1000) ;
 72	mips_hpt_frequency = read_c0_count() * 1000 / WAIT_MS;
 73	printk("%d MHz CPU detected\n", mips_hpt_frequency * 2 / 1000000);
 74}
 75
 76void __init plat_mem_setup(void)
 77{
 78	board_be_init = ip32_be_init;
 79
 80#ifdef CONFIG_SGI_O2MACE_ETH
 81	{
 82		char *mac = ArcGetEnvironmentVariable("eaddr");
 83		str2eaddr(o2meth_eaddr, mac);
 84	}
 85#endif
 86
 87#if defined(CONFIG_SERIAL_CORE_CONSOLE)
 88	{
 89		char* con = ArcGetEnvironmentVariable("console");
 90		if (con && *con == 'd') {
 91			static char options[8] __initdata;
 92			char *baud = ArcGetEnvironmentVariable("dbaud");
 93			if (baud)
 94				strscpy(options, baud);
 95			add_preferred_console("ttyS", *(con + 1) == '2' ? 1 : 0,
 96					      baud ? options : NULL);
 97		}
 98	}
 99#endif
100}