arch/arm/mach-at91/spl_atmel.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2013 Atmel Corporation
   4  *                    Bo Shen <voice.shen@atmel.com>
   5  */
   6
   7 #include <common.h>
   8 #include <hang.h>
   9 #include <init.h>
  10 #include <log.h>
  11 #include <asm/io.h>
  12 #include <asm/arch/at91_common.h>
  13 #include <asm/arch/at91_pit.h>
  14 #include <asm/arch/at91_pmc.h>
  15 #include <asm/arch/at91_rstc.h>
  16 #include <asm/arch/at91_wdt.h>
  17 #include <asm/arch/clk.h>
  18 #include <spl.h>
  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 /*
  51  * some boards have an external oscillator with driving.
  52  * in this case we need to disable the internal SoC driving (bypass mode)
  53  */
  54 #if defined(CONFIG_SPL_AT91_MCK_BYPASS)
  55         tmp |= AT91_PMC_MOR_OSCBYPASS;
  56 #else
  57         tmp &= ~AT91_PMC_MOR_OSCBYPASS;
  58 #endif
  59         tmp &= ~AT91_PMC_MOR_KEY(0xff);
  60         tmp |= AT91_PMC_MOR_KEY(0x37);
  61         writel(tmp, &pmc->mor);
  62
  63         tmp = readl(&pmc->mor);
  64         tmp |= AT91_PMC_MOR_MOSCSEL;
  65         tmp &= ~AT91_PMC_MOR_KEY(0xff);
  66         tmp |= AT91_PMC_MOR_KEY(0x37);
  67         writel(tmp, &pmc->mor);
  68
  69         while (!(readl(&pmc->sr) & AT91_PMC_IXR_MOSCSELS))
  70                 ;
  71
  72 #if !defined(CONFIG_SAMA5D2)
  73         /* Wait until MAINRDY field is set to make sure main clock is stable */
  74         while (!(readl(&pmc->mcfr) & AT91_PMC_MAINRDY))
  75                 ;
  76 #endif
  77
  78 #if !defined(CONFIG_SAMA5D4) && !defined(CONFIG_SAMA5D2)
  79         tmp = readl(&pmc->mor);
  80         tmp &= ~AT91_PMC_MOR_MOSCRCEN;
  81         tmp &= ~AT91_PMC_MOR_KEY(0xff);
  82         tmp |= AT91_PMC_MOR_KEY(0x37);
  83         writel(tmp, &pmc->mor);
  84 #endif
  85 }
  86
  87 __weak void matrix_init(void)
  88 {
  89         /* This only be used for sama5d4 soc now */
  90 }
  91
  92 __weak void redirect_int_from_saic_to_aic(void)
  93 {
  94         /* This only be used for sama5d4 soc now */
  95 }
  96
  97 /* empty stub to satisfy current lowlevel_init, can be removed any time */
  98 void s_init(void)
  99 {
 100 }
 101
 102 void board_init_f(ulong dummy)
 103 {
 104         int ret;
 105
 106         switch_to_main_crystal_osc();
 107
 108 #ifdef CONFIG_SAMA5D2
 109         configure_2nd_sram_as_l2_cache();
 110 #endif
 111
 112 #if !defined(CONFIG_WDT_AT91)
 113         /* disable watchdog */
 114         at91_disable_wdt();
 115 #endif
 116
 117         /* PMC configuration */
 118         at91_pmc_init();
 119
 120         at91_clock_init(CONFIG_SYS_AT91_MAIN_CLOCK);
 121
 122         matrix_init();
 123
 124         redirect_int_from_saic_to_aic();
 125
 126         timer_init();
 127
 128         board_early_init_f();
 129
 130         mem_init();
 131
 132         ret = spl_init();
 133         if (ret) {
 134                 debug("spl_init() failed: %d\n", ret);
 135                 hang();
 136         }
 137
 138         preloader_console_init();
 139
 140 }