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 #if defined(CONFIG_SAMA5D2)
  36         /* Enable a measurement of the external oscillator */
  37         tmp = readl(&pmc->mcfr);
  38         tmp |= AT91_PMC_MCFR_CCSS_XTAL_OSC;
  39         tmp |= AT91_PMC_MCFR_RCMEAS;
  40         writel(tmp, &pmc->mcfr);
  41
  42         while (!(readl(&pmc->mcfr) & AT91_PMC_MCFR_MAINRDY))
  43                 ;
  44
  45         if (!(readl(&pmc->mcfr) & AT91_PMC_MCFR_MAINF_MASK))
  46                 hang();
  47 #endif
  48
  49         tmp = readl(&pmc->mor);
  50         tmp &= ~AT91_PMC_MOR_OSCBYPASS;
  51         tmp &= ~AT91_PMC_MOR_KEY(0xff);
  52         tmp |= AT91_PMC_MOR_KEY(0x37);
  53         writel(tmp, &pmc->mor);
  54
  55         tmp = readl(&pmc->mor);
  56         tmp |= AT91_PMC_MOR_MOSCSEL;
  57         tmp &= ~AT91_PMC_MOR_KEY(0xff);
  58         tmp |= AT91_PMC_MOR_KEY(0x37);
  59         writel(tmp, &pmc->mor);
  60
  61         while (!(readl(&pmc->sr) & AT91_PMC_IXR_MOSCSELS))
  62                 ;
  63
  64 #if !defined(CONFIG_SAMA5D2)
  65         /* Wait until MAINRDY field is set to make sure main clock is stable */
  66         while (!(readl(&pmc->mcfr) & AT91_PMC_MAINRDY))
  67                 ;
  68 #endif
  69
  70 #if !defined(CONFIG_SAMA5D4) && !defined(CONFIG_SAMA5D2)
  71         tmp = readl(&pmc->mor);
  72         tmp &= ~AT91_PMC_MOR_MOSCRCEN;
  73         tmp &= ~AT91_PMC_MOR_KEY(0xff);
  74         tmp |= AT91_PMC_MOR_KEY(0x37);
  75         writel(tmp, &pmc->mor);
  76 #endif
  77 }
  78
  79 __weak void matrix_init(void)
  80 {
  81         /* This only be used for sama5d4 soc now */
  82 }
  83
  84 __weak void redirect_int_from_saic_to_aic(void)
  85 {
  86         /* This only be used for sama5d4 soc now */
  87 }
  88
  89 /* empty stub to satisfy current lowlevel_init, can be removed any time */
  90 void s_init(void)
  91 {
  92 }
  93
  94 void board_init_f(ulong dummy)
  95 {
  96         int ret;
  97
  98         switch_to_main_crystal_osc();
  99
 100 #ifdef CONFIG_SAMA5D2
 101         configure_2nd_sram_as_l2_cache();
 102 #endif
 103
 104         /* disable watchdog */
 105         at91_disable_wdt();
 106
 107         /* PMC configuration */
 108         at91_pmc_init();
 109
 110         at91_clock_init(CONFIG_SYS_AT91_MAIN_CLOCK);
 111
 112         matrix_init();
 113
 114         redirect_int_from_saic_to_aic();
 115
 116         timer_init();
 117
 118         board_early_init_f();
 119
 120         mem_init();
 121
 122         ret = spl_init();
 123         if (ret) {
 124                 debug("spl_init() failed: %d\n", ret);
 125                 hang();
 126         }
 127
 128         preloader_console_init();
 129
 130 }