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
  39 ulong loops_per_jiffy;
  40
  41 #ifdef CONFIG_USE_IRQ
  42 DECLARE_GLOBAL_DATA_PTR;
  43 #endif
  44
  45 static void cache_flush(void);
  46
  47 #if defined(CONFIG_DISPLAY_CPUINFO)
  48 int print_cpuinfo (void)
  49 {
  50         unsigned long id;
  51         int speed = 0;
  52
  53         asm ("mrc p15, 0, %0, c0, c0, 0":"=r" (id));
  54
  55         puts("CPU:   Intel IXP425 at ");
  56         switch ((id & 0x000003f0) >> 4) {
  57         case 0x1c:
  58                 loops_per_jiffy = 887467;
  59                 speed = 533;
  60                 break;
  61
  62         case 0x1d:
  63                 loops_per_jiffy = 666016;
  64                 speed = 400;
  65                 break;
  66
  67         case 0x1f:
  68                 loops_per_jiffy = 442901;
  69                 speed = 266;
  70                 break;
  71         }
  72
  73         if (speed)
  74                 printf("%d MHz\n", speed);
  75         else
  76                 puts("unknown revision\n");
  77
  78         return 0;
  79 }
  80 #endif /* CONFIG_DISPLAY_CPUINFO */
  81
  82 int cpu_init (void)
  83 {
  84         /*
  85          * setup up stacks if necessary
  86          */
  87 #ifdef CONFIG_USE_IRQ
  88         IRQ_STACK_START = _armboot_start - CONFIG_SYS_MALLOC_LEN - CONFIG_SYS_GBL_DATA_SIZE - 4;
  89         FIQ_STACK_START = IRQ_STACK_START - CONFIG_STACKSIZE_IRQ;
  90 #endif
  91
  92         return 0;
  93 }
  94
  95 int cleanup_before_linux (void)
  96 {
  97         /*
  98          * this function is called just before we call linux
  99          * it prepares the processor for linux
 100          *
 101          * just disable everything that can disturb booting linux
 102          */
 103
 104         disable_interrupts ();
 105
 106         /* turn off I-cache */
 107         icache_disable();
 108         dcache_disable();
 109
 110         /* flush I-cache */
 111         cache_flush();
 112
 113         return 0;
 114 }
 115
 116 /* flush I/D-cache */
 117 static void cache_flush (void)
 118 {
 119         unsigned long i = 0;
 120
 121         asm ("mcr p15, 0, %0, c7, c5, 0": :"r" (i));
 122 }
 123
 124 /* FIXME */
 125 /*
 126 void pci_init(void)
 127 {
 128         return;
 129 }
 130 */
 131
 132 #ifdef CONFIG_BOOTCOUNT_LIMIT
 133
 134 void bootcount_store (ulong a)
 135 {
 136         volatile ulong *save_addr = (volatile ulong *)(CONFIG_SYS_BOOTCOUNT_ADDR);
 137
 138         save_addr[0] = a;
 139         save_addr[1] = BOOTCOUNT_MAGIC;
 140 }
 141
 142 ulong bootcount_load (void)
 143 {
 144         volatile ulong *save_addr = (volatile ulong *)(CONFIG_SYS_BOOTCOUNT_ADDR);
 145
 146         if (save_addr[1] != BOOTCOUNT_MAGIC)
 147                 return 0;
 148         else
 149                 return save_addr[0];
 150 }
 151
 152 #endif /* CONFIG_BOOTCOUNT_LIMIT */
 153
 154 int cpu_eth_init(bd_t *bis)
 155 {
 156 #ifdef CONFIG_IXP4XX_NPE
 157         npe_initialize(bis);
 158 #endif
 159         return 0;
 160 }