arch/arm/mach-at91/spl_atmel.c

   1 /*
   2  * Copyright (C) 2013 Atmel Corporation
   3  *                    Bo Shen <voice.shen@atmel.com>
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <common.h>
   9 #include <asm/io.h>
  10 #include <asm/arch/at91_common.h>
  11 #include <asm/arch/at91_pit.h>
  12 #include <asm/arch/at91_pmc.h>
  13 #include <asm/arch/at91_rstc.h>
  14 #include <asm/arch/at91_wdt.h>
  15 #include <asm/arch/clk.h>
  16 #include <spl.h>
  17
  18 DECLARE_GLOBAL_DATA_PTR;
  19
  20 static void switch_to_main_crystal_osc(void)
  21 {
  22         struct at91_pmc *pmc = (struct at91_pmc *)ATMEL_BASE_PMC;
  23         u32 tmp;
  24
  25         tmp = readl(&pmc->mor);
  26         tmp &= ~AT91_PMC_MOR_OSCOUNT(0xff);
  27         tmp &= ~AT91_PMC_MOR_KEY(0xff);
  28         tmp |= AT91_PMC_MOR_MOSCEN;
  29         tmp |= AT91_PMC_MOR_OSCOUNT(8);
  30         tmp |= AT91_PMC_MOR_KEY(0x37);
  31         writel(tmp, &pmc->mor);
  32         while (!(readl(&pmc->sr) & AT91_PMC_IXR_MOSCS))
  33                 ;
  34
  35         tmp = readl(&pmc->mor);
  36         tmp &= ~AT91_PMC_MOR_OSCBYPASS;
  37         tmp &= ~AT91_PMC_MOR_KEY(0xff);
  38         tmp |= AT91_PMC_MOR_KEY(0x37);
  39         writel(tmp, &pmc->mor);
  40
  41         tmp = readl(&pmc->mor);
  42         tmp |= AT91_PMC_MOR_MOSCSEL;
  43         tmp &= ~AT91_PMC_MOR_KEY(0xff);
  44         tmp |= AT91_PMC_MOR_KEY(0x37);
  45         writel(tmp, &pmc->mor);
  46
  47         while (!(readl(&pmc->sr) & AT91_PMC_IXR_MOSCSELS))
  48                 ;
  49
  50         /* Wait until MAINRDY field is set to make sure main clock is stable */
  51         while (!(readl(&pmc->mcfr) & AT91_PMC_MAINRDY))
  52                 ;
  53
  54 #ifndef CONFIG_SOC_SAMA5D4
  55         tmp = readl(&pmc->mor);
  56         tmp &= ~AT91_PMC_MOR_MOSCRCEN;
  57         tmp &= ~AT91_PMC_MOR_KEY(0xff);
  58         tmp |= AT91_PMC_MOR_KEY(0x37);
  59         writel(tmp, &pmc->mor);
  60 #endif
  61 }
  62
  63 __weak void matrix_init(void)
  64 {
  65         /* This only be used for sama5d4 soc now */
  66 }
  67
  68 __weak void redirect_int_from_saic_to_aic(void)
  69 {
  70         /* This only be used for sama5d4 soc now */
  71 }
  72
  73 /* empty stub to satisfy current lowlevel_init, can be removed any time */
  74 void s_init(void)
  75 {
  76 }
  77
  78 void board_init_f(ulong dummy)
  79 {
  80         switch_to_main_crystal_osc();
  81
  82         /* disable watchdog */
  83         at91_disable_wdt();
  84
  85         /* PMC configuration */
  86         at91_pmc_init();
  87
  88         at91_clock_init(CONFIG_SYS_AT91_MAIN_CLOCK);
  89
  90         matrix_init();
  91
  92         redirect_int_from_saic_to_aic();
  93
  94         timer_init();
  95
  96         board_early_init_f();
  97
  98         preloader_console_init();
  99
 100         mem_init();
 101
 102         /* Clear the BSS. */
 103         memset(__bss_start, 0, __bss_end - __bss_start);
 104
 105         board_init_r(NULL, 0);
 106 }