git.sur5r.net Git - u-boot/blob - 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 static void switch_to_main_crystal_osc(void)
  19 {
  20         struct at91_pmc *pmc = (struct at91_pmc *)ATMEL_BASE_PMC;
  21         u32 tmp;
  22
  23         tmp = readl(&pmc->mor);
  24         tmp &= ~AT91_PMC_MOR_OSCOUNT(0xff);
  25         tmp &= ~AT91_PMC_MOR_KEY(0xff);
  26         tmp |= AT91_PMC_MOR_MOSCEN;
  27         tmp |= AT91_PMC_MOR_OSCOUNT(8);
  28         tmp |= AT91_PMC_MOR_KEY(0x37);
  29         writel(tmp, &pmc->mor);
  30         while (!(readl(&pmc->sr) & AT91_PMC_IXR_MOSCS))
  31                 ;
  32
  33 #if defined(CONFIG_SAMA5D2)
  34         /* Enable a measurement of the external oscillator */
  35         tmp = readl(&pmc->mcfr);
  36         tmp |= AT91_PMC_MCFR_CCSS_XTAL_OSC;
  37         tmp |= AT91_PMC_MCFR_RCMEAS;
  38         writel(tmp, &pmc->mcfr);
  39
  40         while (!(readl(&pmc->mcfr) & AT91_PMC_MCFR_MAINRDY))
  41                 ;
  42
  43         if (!(readl(&pmc->mcfr) & AT91_PMC_MCFR_MAINF_MASK))
  44                 hang();
  45 #endif
  46
  47         tmp = readl(&pmc->mor);
  48         tmp &= ~AT91_PMC_MOR_OSCBYPASS;
  49         tmp &= ~AT91_PMC_MOR_KEY(0xff);
  50         tmp |= AT91_PMC_MOR_KEY(0x37);
  51         writel(tmp, &pmc->mor);
  52
  53         tmp = readl(&pmc->mor);
  54         tmp |= AT91_PMC_MOR_MOSCSEL;
  55         tmp &= ~AT91_PMC_MOR_KEY(0xff);
  56         tmp |= AT91_PMC_MOR_KEY(0x37);
  57         writel(tmp, &pmc->mor);
  58
  59         while (!(readl(&pmc->sr) & AT91_PMC_IXR_MOSCSELS))
  60                 ;
  61
  62 #if !defined(CONFIG_SAMA5D2)
  63         /* Wait until MAINRDY field is set to make sure main clock is stable */
  64         while (!(readl(&pmc->mcfr) & AT91_PMC_MAINRDY))
  65                 ;
  66 #endif
  67
  68 #if !defined(CONFIG_SAMA5D4) && !defined(CONFIG_SAMA5D2)
  69         tmp = readl(&pmc->mor);
  70         tmp &= ~AT91_PMC_MOR_MOSCRCEN;
  71         tmp &= ~AT91_PMC_MOR_KEY(0xff);
  72         tmp |= AT91_PMC_MOR_KEY(0x37);
  73         writel(tmp, &pmc->mor);
  74 #endif
  75 }
  76
  77 __weak void matrix_init(void)
  78 {
  79         /* This only be used for sama5d4 soc now */
  80 }
  81
  82 __weak void redirect_int_from_saic_to_aic(void)
  83 {
  84         /* This only be used for sama5d4 soc now */
  85 }
  86
  87 /* empty stub to satisfy current lowlevel_init, can be removed any time */
  88 void s_init(void)
  89 {
  90 }
  91
  92 void board_init_f(ulong dummy)
  93 {
  94         int ret;
  95
  96         switch_to_main_crystal_osc();
  97
  98 #ifdef CONFIG_SAMA5D2
  99         configure_2nd_sram_as_l2_cache();
 100 #endif
 101
 102         /* disable watchdog */
 103         at91_disable_wdt();
 104
 105         /* PMC configuration */
 106         at91_pmc_init();
 107
 108         at91_clock_init(CONFIG_SYS_AT91_MAIN_CLOCK);
 109
 110         matrix_init();
 111
 112         redirect_int_from_saic_to_aic();
 113
 114         timer_init();
 115
 116         board_early_init_f();
 117
 118         mem_init();
 119
 120         ret = spl_init();
 121         if (ret) {
 122                 debug("spl_init() failed: %d\n", ret);
 123                 hang();
 124         }
 125
 126         preloader_console_init();
 127
 128 }