arch/arm/cpu/arm720t/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 <clps7111.h>
  36 #include <asm/hardware.h>
  37 #include <asm/system.h>
  38
  39 #if defined(CONFIG_IMPA7) || defined(CONFIG_EP7312) || defined(CONFIG_ARMADILLO)
  40 static void cache_flush(void);
  41 #endif
  42
  43 int cleanup_before_linux (void)
  44 {
  45         /*
  46          * this function is called just before we call linux
  47          * it prepares the processor for linux
  48          *
  49          * we turn off caches etc ...
  50          * and we set the CPU-speed to 73 MHz - see start.S for details
  51          */
  52
  53 #if defined(CONFIG_IMPA7) || defined(CONFIG_EP7312) || defined(CONFIG_ARMADILLO)
  54         disable_interrupts ();
  55
  56         /* turn off I-cache */
  57         icache_disable();
  58         dcache_disable();
  59
  60         /* flush I-cache */
  61         cache_flush();
  62 #ifdef CONFIG_ARM7_REVD
  63         /* go to high speed */
  64         IO_SYSCON3 = (IO_SYSCON3 & ~CLKCTL) | CLKCTL_73;
  65 #endif
  66 #elif defined(CONFIG_NETARM) || defined(CONFIG_S3C4510B) || defined(CONFIG_LPC2292)
  67         disable_interrupts ();
  68         /* Nothing more needed */
  69 #elif defined(CONFIG_INTEGRATOR) && defined(CONFIG_ARCH_INTEGRATOR)
  70         /* No cleanup before linux for IntegratorAP/CM720T as yet */
  71 #else
  72 #error No cleanup_before_linux() defined for this CPU type
  73 #endif
  74         return 0;
  75 }
  76
  77 #if defined(CONFIG_IMPA7) || defined(CONFIG_EP7312) || defined(CONFIG_ARMADILLO)
  78 /* flush I/D-cache */
  79 static void cache_flush (void)
  80 {
  81         unsigned long i = 0;
  82
  83         asm ("mcr p15, 0, %0, c7, c5, 0": :"r" (i));
  84 }
  85 #elif defined(CONFIG_INTEGRATOR) && defined(CONFIG_ARCH_INTEGRATOR)
  86         /* No specific cache setup for IntegratorAP/CM720T as yet */
  87         void icache_enable (void)
  88         {
  89         }
  90 #endif