arch/arm/cpu/arm920t/ep93xx/lowlevel_init.S

   1 /*
   2  * Low-level initialization for EP93xx
   3  *
   4  * Copyright (C) 2009 Matthias Kaehlcke <matthias@kaehlcke.net>
   5  *
   6  * Copyright (C) 2006 Dominic Rath <Dominic.Rath@gmx.de>
   7  *
   8  * SPDX-License-Identifier:     GPL-2.0+
   9  */
  10
  11 #include <version.h>
  12 #include <asm/arch/ep93xx.h>
  13
  14 .globl lowlevel_init
  15 lowlevel_init:
  16         /* backup return address */
  17         ldr r1, =SYSCON_SCRATCH0
  18         str lr, [r1]
  19
  20         /* Turn on both LEDs */
  21         bl red_led_on
  22         bl green_led_on
  23
  24         /* Configure flash wait states before we switch to the PLL */
  25         bl flash_cfg
  26
  27         /* Set up PLL */
  28         bl pll_cfg
  29
  30         /* Turn off the Green LED and leave the Red LED on */
  31         bl green_led_off
  32
  33         /* Setup SDRAM */
  34         bl sdram_cfg
  35
  36         /* Turn on Green LED, Turn off the Red LED */
  37         bl green_led_on
  38         bl red_led_off
  39
  40         /* FIXME: we use async mode for now */
  41         mrc p15, 0, r0, c1, c0, 0
  42         orr r0, r0, #0xc0000000
  43         mcr p15, 0, r0, c1, c0, 0
  44
  45         /* restore return address */
  46         ldr r1, =SYSCON_SCRATCH0
  47         ldr lr, [r1]
  48
  49         mov pc, lr