arch/arm/cpu/pxa/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 <asm/arch/pxa-regs.h>
  36 #include <asm/system.h>
  37
  38 static void cache_flush(void);
  39
  40 int cleanup_before_linux (void)
  41 {
  42         /*
  43          * this function is called just before we call linux
  44          * it prepares the processor for linux
  45          *
  46          * just disable everything that can disturb booting linux
  47          */
  48
  49         disable_interrupts ();
  50
  51         /* turn off I-cache */
  52         icache_disable();
  53         dcache_disable();
  54
  55         /* flush I-cache */
  56         cache_flush();
  57
  58         return (0);
  59 }
  60
  61 /* flush I/D-cache */
  62 static void cache_flush (void)
  63 {
  64         unsigned long i = 0;
  65
  66         asm ("mcr p15, 0, %0, c7, c5, 0": :"r" (i));
  67 }
  68
  69 #ifndef CONFIG_CPU_MONAHANS
  70 void set_GPIO_mode(int gpio_mode)
  71 {
  72         int gpio = gpio_mode & GPIO_MD_MASK_NR;
  73         int fn = (gpio_mode & GPIO_MD_MASK_FN) >> 8;
  74         int gafr;
  75
  76         if (gpio_mode & GPIO_MD_MASK_DIR)
  77         {
  78                 GPDR(gpio) |= GPIO_bit(gpio);
  79         }
  80         else
  81         {
  82                 GPDR(gpio) &= ~GPIO_bit(gpio);
  83         }
  84         gafr = GAFR(gpio) & ~(0x3 << (((gpio) & 0xf)*2));
  85         GAFR(gpio) = gafr |  (fn  << (((gpio) & 0xf)*2));
  86 }
  87 #endif /* CONFIG_CPU_MONAHANS */