LXR uboot/cpu/ixp/cpu.c

   1/*
   2 * (C) Copyright 2002
   3 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
   4 * Marius Groeger <mgroeger@sysgo.de>
   5 *
   6 * (C) Copyright 2002
   7 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
   8 * Alex Zuepke <azu@sysgo.de>
   9 *
  10 * See file CREDITS for list of people who contributed to this
  11 * project.
  12 *
  13 * This program is free software; you can redistribute it and/or
  14 * modify it under the terms of the GNU General Public License as
  15 * published by the Free Software Foundation; either version 2 of
  16 * the License, or (at your option) any later version.
  17 *
  18 * This program is distributed in the hope that it will be useful,
  19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21 * GNU General Public License for more details.
  22 *
  23 * You should have received a copy of the GNU General Public License
  24 * along with this program; if not, write to the Free Software
  25 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  26 * MA 02111-1307 USA
  27 */
  28
  29/*
  30 * CPU specific code
  31 */
  32
  33#include <common.h>
  34#include <command.h>
  35#include <netdev.h>
  36#include <asm/arch/ixp425.h>
  37#include <asm/system.h>
  38
  39ulong loops_per_jiffy;
  40
  41static void cache_flush(void);
  42
  43#if defined(CONFIG_DISPLAY_CPUINFO)
  44int print_cpuinfo (void)
  45{
  46        unsigned long id;
  47        int speed = 0;
  48
  49        asm ("mrc p15, 0, %0, c0, c0, 0":"=r" (id));
  50
  51        puts("CPU:   Intel IXP425 at ");
  52        switch ((id & 0x000003f0) >> 4) {
  53        case 0x1c:
  54                loops_per_jiffy = 887467;
  55                speed = 533;
  56                break;
  57
  58        case 0x1d:
  59                loops_per_jiffy = 666016;
  60                speed = 400;
  61                break;
  62
  63        case 0x1f:
  64                loops_per_jiffy = 442901;
  65                speed = 266;
  66                break;
  67        }
  68
  69        if (speed)
  70                printf("%d MHz\n", speed);
  71        else
  72                puts("unknown revision\n");
  73
  74        return 0;
  75}
  76#endif /* CONFIG_DISPLAY_CPUINFO */
  77
  78int cleanup_before_linux (void)
  79{
  80        /*
  81         * this function is called just before we call linux
  82         * it prepares the processor for linux
  83         *
  84         * just disable everything that can disturb booting linux
  85         */
  86
  87        disable_interrupts ();
  88
  89        /* turn off I-cache */
  90        icache_disable();
  91        dcache_disable();
  92
  93        /* flush I-cache */
  94        cache_flush();
  95
  96        return 0;
  97}
  98
  99/* flush I/D-cache */
 100static void cache_flush (void)
 101{
 102        unsigned long i = 0;
 103
 104        asm ("mcr p15, 0, %0, c7, c5, 0": :"r" (i));
 105}
 106
 107/* FIXME */
 108/*
 109void pci_init(void)
 110{
 111        return;
 112}
 113*/
 114
 115#ifdef CONFIG_BOOTCOUNT_LIMIT
 116
 117void bootcount_store (ulong a)
 118{
 119        volatile ulong *save_addr = (volatile ulong *)(CONFIG_SYS_BOOTCOUNT_ADDR);
 120
 121        save_addr[0] = a;
 122        save_addr[1] = BOOTCOUNT_MAGIC;
 123}
 124
 125ulong bootcount_load (void)
 126{
 127        volatile ulong *save_addr = (volatile ulong *)(CONFIG_SYS_BOOTCOUNT_ADDR);
 128
 129        if (save_addr[1] != BOOTCOUNT_MAGIC)
 130                return 0;
 131        else
 132                return save_addr[0];
 133}
 134
 135#endif /* CONFIG_BOOTCOUNT_LIMIT */
 136
 137int cpu_eth_init(bd_t *bis)
 138{
 139#ifdef CONFIG_IXP4XX_NPE
 140        npe_initialize(bis);
 141#endif
 142        return 0;
 143}
 144