arch/arm/cpu/arm920t/at91/reset.c

   1 /*
   2  * (C) Copyright 2002
   3  * Lineo, Inc. <www.lineo.com>
   4  * Bernhard Kuhn <bkuhn@lineo.com>
   5  *
   6  * (C) Copyright 2002
   7  * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
   8  * Marius Groeger <mgroeger@sysgo.de>
   9  *
  10  * (C) Copyright 2002
  11  * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
  12  * Alex Zuepke <azu@sysgo.de>
  13  *
  14  * SPDX-License-Identifier:     GPL-2.0+
  15  */
  16
  17 #include <common.h>
  18 #include <asm/io.h>
  19 #include <asm/arch/hardware.h>
  20 #include <asm/arch/at91_st.h>
  21
  22 void  __attribute__((weak)) board_reset(void)
  23 {
  24         /* true empty function for defining weak symbol */
  25 }
  26
  27 void reset_cpu(ulong ignored)
  28 {
  29         at91_st_t *st = (at91_st_t *) ATMEL_BASE_ST;
  30
  31         board_reset();
  32
  33         /* Reset the cpu by setting up the watchdog timer */
  34         writel(AT91_ST_WDMR_RSTEN | AT91_ST_WDMR_EXTEN | AT91_ST_WDMR_WDV(2),
  35                 &st->wdmr);
  36         writel(AT91_ST_CR_WDRST, &st->cr);
  37         /* and let it timeout */
  38         while (1)
  39                 ;
  40         /* Never reached */
  41 }