git.sur5r.net Git - u-boot/blob - 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 <asm/io.h>
   9 #include <asm/arch/at91_common.h>
  10 #include <asm/arch/at91_pit.h>
  11 #include <asm/arch/at91_pmc.h>
  12 #include <asm/arch/at91_rstc.h>
  13 #include <asm/arch/at91_wdt.h>
  14 #include <asm/arch/clk.h>
  15 #include <spl.h>
  16
  17 static void switch_to_main_crystal_osc(void)
  18 {
  19         struct at91_pmc *pmc = (struct at91_pmc *)ATMEL_BASE_PMC;
  20         u32 tmp;
  21
  22         tmp = readl(&pmc->mor);
  23         tmp &= ~AT91_PMC_MOR_OSCOUNT(0xff);
  24         tmp &= ~AT91_PMC_MOR_KEY(0xff);
  25         tmp |= AT91_PMC_MOR_MOSCEN;
  26         tmp |= AT91_PMC_MOR_OSCOUNT(8);
  27         tmp |= AT91_PMC_MOR_KEY(0x37);
  28         writel(tmp, &pmc->mor);
  29         while (!(readl(&pmc->sr) & AT91_PMC_IXR_MOSCS))
  30                 ;
  31
  32 #if defined(CONFIG_SAMA5D2)
  33         /* Enable a measurement of the external oscillator */
  34         tmp = readl(&pmc->mcfr);
  35         tmp |= AT91_PMC_MCFR_CCSS_XTAL_OSC;
  36         tmp |= AT91_PMC_MCFR_RCMEAS;
  37         writel(tmp, &pmc->mcfr);
  38
  39         while (!(readl(&pmc->mcfr) & AT91_PMC_MCFR_MAINRDY))
  40                 ;
  41
  42         if (!(readl(&pmc->mcfr) & AT91_PMC_MCFR_MAINF_MASK))
  43                 hang();
  44 #endif
  45
  46         tmp = readl(&pmc->mor);
  47         tmp &= ~AT91_PMC_MOR_OSCBYPASS;
  48         tmp &= ~AT91_PMC_MOR_KEY(0xff);
  49         tmp |= AT91_PMC_MOR_KEY(0x37);
  50         writel(tmp, &pmc->mor);
  51
  52         tmp = readl(&pmc->mor);
  53         tmp |= AT91_PMC_MOR_MOSCSEL;
  54         tmp &= ~AT91_PMC_MOR_KEY(0xff);
  55         tmp |= AT91_PMC_MOR_KEY(0x37);
  56         writel(tmp, &pmc->mor);
  57
  58         while (!(readl(&pmc->sr) & AT91_PMC_IXR_MOSCSELS))
  59                 ;
  60
  61 #if !defined(CONFIG_SAMA5D2)
  62         /* Wait until MAINRDY field is set to make sure main clock is stable */
  63         while (!(readl(&pmc->mcfr) & AT91_PMC_MAINRDY))
  64                 ;
  65 #endif
  66
  67 #if !defined(CONFIG_SAMA5D4) && !defined(CONFIG_SAMA5D2)
  68         tmp = readl(&pmc->mor);
  69         tmp &= ~AT91_PMC_MOR_MOSCRCEN;
  70         tmp &= ~AT91_PMC_MOR_KEY(0xff);
  71         tmp |= AT91_PMC_MOR_KEY(0x37);
  72         writel(tmp, &pmc->mor);
  73 #endif
  74 }
  75
  76 __weak void matrix_init(void)
  77 {
  78         /* This only be used for sama5d4 soc now */
  79 }
  80
  81 __weak void redirect_int_from_saic_to_aic(void)
  82 {
  83         /* This only be used for sama5d4 soc now */
  84 }
  85
  86 /* empty stub to satisfy current lowlevel_init, can be removed any time */
  87 void s_init(void)
  88 {
  89 }
  90
  91 void board_init_f(ulong dummy)
  92 {
  93         int ret;
  94
  95         switch_to_main_crystal_osc();
  96
  97 #ifdef CONFIG_SAMA5D2
  98         configure_2nd_sram_as_l2_cache();
  99 #endif
 100
 101         /* disable watchdog */
 102         at91_disable_wdt();
 103
 104         /* PMC configuration */
 105         at91_pmc_init();
 106
 107         at91_clock_init(CONFIG_SYS_AT91_MAIN_CLOCK);
 108
 109         matrix_init();
 110
 111         redirect_int_from_saic_to_aic();
 112
 113         timer_init();
 114
 115         board_early_init_f();
 116
 117         mem_init();
 118
 119         ret = spl_init();
 120         if (ret) {
 121                 debug("spl_init() failed: %d\n", ret);
 122                 hang();
 123         }
 124
 125         preloader_console_init();
 126
 127 }