text: /*
   * Copyright (C) 2013 Atmel Corporation
   *		      Bo Shen <voice.shen@atmel.com>
   *
   * SPDX-License-Identifier:	GPL-2.0+
   */
  
  #include <common.h>
  #include <asm/io.h>
  #include <asm/arch/at91_common.h>
  #include <asm/arch/at91_pit.h>
  #include <asm/arch/at91_pmc.h>
  #include <asm/arch/at91_rstc.h>
  #include <asm/arch/at91_wdt.h>
  #include <asm/arch/clk.h>
  #include <spl.h>
  
  DECLARE_GLOBAL_DATA_PTR;
  
  static void switch_to_main_crystal_osc(void)
  {
  	struct at91_pmc *pmc = (struct at91_pmc *)ATMEL_BASE_PMC;
  	u32 tmp;
  
  	tmp = readl(&pmc->mor);
  	tmp &= ~AT91_PMC_MOR_OSCOUNT(0xff);
  	tmp &= ~AT91_PMC_MOR_KEY(0xff);
  	tmp |= AT91_PMC_MOR_MOSCEN;
  	tmp |= AT91_PMC_MOR_OSCOUNT(8);
  	tmp |= AT91_PMC_MOR_KEY(0x37);
  	writel(tmp, &pmc->mor);
  	while (!(readl(&pmc->sr) & AT91_PMC_IXR_MOSCS))
  		;
  
  	tmp = readl(&pmc->mor);
  	tmp &= ~AT91_PMC_MOR_OSCBYPASS;
  	tmp &= ~AT91_PMC_MOR_KEY(0xff);
  	tmp |= AT91_PMC_MOR_KEY(0x37);
  	writel(tmp, &pmc->mor);
  
  	tmp = readl(&pmc->mor);
  	tmp |= AT91_PMC_MOR_MOSCSEL;
  	tmp &= ~AT91_PMC_MOR_KEY(0xff);
  	tmp |= AT91_PMC_MOR_KEY(0x37);
  	writel(tmp, &pmc->mor);
  
  	while (!(readl(&pmc->sr) & AT91_PMC_IXR_MOSCSELS))
  		;
  
  	/* Wait until MAINRDY field is set to make sure main clock is stable */
  	while (!(readl(&pmc->mcfr) & AT91_PMC_MAINRDY))
  		;
  
  #ifndef CONFIG_SAMA5D4
  	tmp = readl(&pmc->mor);
  	tmp &= ~AT91_PMC_MOR_MOSCRCEN;
  	tmp &= ~AT91_PMC_MOR_KEY(0xff);
  	tmp |= AT91_PMC_MOR_KEY(0x37);
  	writel(tmp, &pmc->mor);
  #endif
  }
  
  __weak void matrix_init(void)
  {
  	/* This only be used for sama5d4 soc now */
  }
  
  __weak void redirect_int_from_saic_to_aic(void)
  {
  	/* This only be used for sama5d4 soc now */
  }
  
  /* empty stub to satisfy current lowlevel_init, can be removed any time */
  void s_init(void)
  {
  }
  
  void board_init_f(ulong dummy)
  {
  	int ret;
  
  	switch_to_main_crystal_osc();
  
  #ifdef CONFIG_SAMA5D2
  	configure_2nd_sram_as_l2_cache();
  #endif
  
  	/* disable watchdog */
  	at91_disable_wdt();
  
  	/* PMC configuration */
  	at91_pmc_init();
  
  	at91_clock_init(CONFIG_SYS_AT91_MAIN_CLOCK);
  
  	matrix_init();
  
  	redirect_int_from_saic_to_aic();
  
  	timer_init();
  
  	board_early_init_f();
  
  	mem_init();
  
  	ret = spl_init();
  	if (ret) {
  		debug("spl_init() failed: %d\n", ret);
  		hang();
  	}
  
  	preloader_console_init();
  
  }
  