cpu/arm1136/cpu.c

   1 /*
   2  * (C) Copyright 2004 Texas Insturments
   3  *
   4  * (C) Copyright 2002
   5  * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
   6  * Marius Groeger <mgroeger@sysgo.de>
   7  *
   8  * (C) Copyright 2002
   9  * Gary Jennejohn, DENX Software Engineering, <garyj@denx.de>
  10  *
  11  * See file CREDITS for list of people who contributed to this
  12  * project.
  13  *
  14  * This program is free software; you can redistribute it and/or
  15  * modify it under the terms of the GNU General Public License as
  16  * published by the Free Software Foundation; either version 2 of
  17  * the License, or (at your option) any later version.
  18  *
  19  * This program is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with this program; if not, write to the Free Software
  26  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  27  * MA 02111-1307 USA
  28  */
  29
  30 /*
  31  * CPU specific code
  32  */
  33
  34 #include <common.h>
  35 #include <command.h>
  36 #include <asm/system.h>
  37
  38 #ifdef CONFIG_USE_IRQ
  39 DECLARE_GLOBAL_DATA_PTR;
  40 #endif
  41
  42 static void cache_flush(void);
  43
  44 int cpu_init (void)
  45 {
  46         /*
  47          * setup up stacks if necessary
  48          */
  49 #ifdef CONFIG_USE_IRQ
  50         IRQ_STACK_START = _armboot_start - CONFIG_SYS_MALLOC_LEN - CONFIG_SYS_GBL_DATA_SIZE - 4;
  51         FIQ_STACK_START = IRQ_STACK_START - CONFIG_STACKSIZE_IRQ;
  52 #endif
  53         return 0;
  54 }
  55
  56 int cleanup_before_linux (void)
  57 {
  58         /*
  59          * this function is called just before we call linux
  60          * it prepares the processor for linux
  61          *
  62          * we turn off caches etc ...
  63          */
  64
  65         disable_interrupts ();
  66
  67 #ifdef CONFIG_LCD
  68         {
  69                 extern void lcd_disable(void);
  70                 extern void lcd_panel_disable(void);
  71
  72                 lcd_disable(); /* proper disable of lcd & panel */
  73                 lcd_panel_disable();
  74         }
  75 #endif
  76
  77         /* turn off I/D-cache */
  78         icache_disable();
  79         dcache_disable();
  80         /* flush I/D-cache */
  81         cache_flush();
  82
  83         return 0;
  84 }
  85
  86 static void cache_flush(void)
  87 {
  88         unsigned long i = 0;
  89
  90         asm ("mcr p15, 0, %0, c7, c7, 0": :"r" (i));  /* invalidate both caches and flush btb */
  91         asm ("mcr p15, 0, %0, c7, c10, 4": :"r" (i)); /* mem barrier to sync things */
  92 }