cpu/arm_intcm/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  * Gary Jennejohn, DENX Software Engineering, <gj@denx.de>
   8  *
   9  * See file CREDITS for list of people who contributed to this
  10  * project.
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License as
  14  * published by the Free Software Foundation; either version 2 of
  15  * the License, or (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  25  * MA 02111-1307 USA
  26  */
  27
  28 /*
  29  * CPU specific code for an unknown cpu
  30  * - hence fairly empty......
  31  */
  32
  33 #include <common.h>
  34 #include <command.h>
  35
  36 #ifdef CONFIG_USE_IRQ
  37 DECLARE_GLOBAL_DATA_PTR;
  38 #endif
  39
  40 int cpu_init (void)
  41 {
  42         /*
  43          * setup up stacks if necessary
  44          */
  45 #ifdef CONFIG_USE_IRQ
  46         IRQ_STACK_START = _armboot_start - CFG_MALLOC_LEN - CFG_GBL_DATA_SIZE - 4;
  47         FIQ_STACK_START = IRQ_STACK_START - CONFIG_STACKSIZE_IRQ;
  48 #endif
  49         return 0;
  50 }
  51
  52 int cleanup_before_linux (void)
  53 {
  54         /*
  55          * this function is called just before we call linux
  56          * it prepares the processor for linux
  57          *
  58          * we turn off caches etc ...
  59          */
  60
  61         disable_interrupts ();
  62
  63         /* Since the CM has unknown processor we do not support
  64          * cache operations
  65          */
  66
  67         return (0);
  68 }
  69
  70 int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
  71 {
  72         extern void reset_cpu (ulong addr);
  73
  74         disable_interrupts ();
  75         reset_cpu (0);
  76         /*NOTREACHED*/
  77         return (0);
  78 }
  79
  80 /* May not be cahed processor on the CM - do nothing */
  81 void icache_enable (void)
  82 {
  83 }
  84
  85 void icache_disable (void)
  86 {
  87 }
  88
  89 /* return "disabled" */
  90 int icache_status (void)
  91 {
  92         return 0;
  93 }