arch/arm/mach-at91/spl_at91.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * (C) Copyright 2014 DENX Software Engineering
   4  *     Heiko Schocher <hs@denx.de>
   5  *
   6  * Based on:
   7  * Copyright (C) 2013 Atmel Corporation
   8  *                    Bo Shen <voice.shen@atmel.com>
   9  */
  10
  11 #include <common.h>
  12 #include <hang.h>
  13 #include <asm/io.h>
  14 #include <asm/arch/at91_common.h>
  15 #include <asm/arch/at91sam9_matrix.h>
  16 #include <asm/arch/at91_pit.h>
  17 #include <asm/arch/at91_rstc.h>
  18 #include <asm/arch/at91_wdt.h>
  19 #include <asm/arch/clk.h>
  20 #include <spl.h>
  21
  22 DECLARE_GLOBAL_DATA_PTR;
  23
  24 static void enable_ext_reset(void)
  25 {
  26         struct at91_rstc *rstc = (struct at91_rstc *)ATMEL_BASE_RSTC;
  27
  28         writel(AT91_RSTC_KEY | AT91_RSTC_MR_URSTEN, &rstc->mr);
  29 }
  30
  31 void lowlevel_clock_init(void)
  32 {
  33         struct at91_pmc *pmc = (struct at91_pmc *)ATMEL_BASE_PMC;
  34
  35         if (!(readl(&pmc->sr) & AT91_PMC_MOSCS)) {
  36                 /* Enable Main Oscillator */
  37                 writel(AT91_PMC_MOSCS | (0x40 << 8), &pmc->mor);
  38
  39                 /* Wait until Main Oscillator is stable */
  40                 while (!(readl(&pmc->sr) & AT91_PMC_MOSCS))
  41                         ;
  42         }
  43
  44         /* After stabilization, switch to Main Oscillator */
  45         if ((readl(&pmc->mckr) & AT91_PMC_CSS) == AT91_PMC_CSS_SLOW) {
  46                 unsigned long tmp;
  47
  48                 tmp = readl(&pmc->mckr);
  49                 tmp &= ~AT91_PMC_CSS;
  50                 tmp |= AT91_PMC_CSS_MAIN;
  51                 writel(tmp, &pmc->mckr);
  52                 while (!(readl(&pmc->sr) & AT91_PMC_MCKRDY))
  53                         ;
  54
  55                 tmp &= ~AT91_PMC_PRES;
  56                 tmp |= AT91_PMC_PRES_1;
  57                 writel(tmp, &pmc->mckr);
  58                 while (!(readl(&pmc->sr) & AT91_PMC_MCKRDY))
  59                         ;
  60         }
  61
  62         return;
  63 }
  64
  65 void __weak matrix_init(void)
  66 {
  67 }
  68
  69 void __weak at91_spl_board_init(void)
  70 {
  71 }
  72
  73 void __weak spl_board_init(void)
  74 {
  75 }
  76
  77 void board_init_f(ulong dummy)
  78 {
  79 #if CONFIG_IS_ENABLED(OF_CONTROL)
  80         int ret;
  81
  82         ret = spl_early_init();
  83         if (ret) {
  84                 debug("spl_early_init() failed: %d\n", ret);
  85                 hang();
  86         }
  87 #endif
  88
  89         lowlevel_clock_init();
  90 #if !defined(CONFIG_WDT_AT91)
  91         at91_disable_wdt();
  92 #endif
  93
  94         /*
  95          * At this stage the main oscillator is supposed to be enabled
  96          * PCK = MCK = MOSC
  97          */
  98         at91_pllicpr_init(0x00);
  99
 100         /* Configure PLLA = MOSC * (PLL_MULA + 1) / PLL_DIVA */
 101         at91_plla_init(CONFIG_SYS_AT91_PLLA);
 102
 103         /* PCK = PLLA = 2 * MCK */
 104         at91_mck_init(CONFIG_SYS_MCKR);
 105
 106         /* Switch MCK on PLLA output */
 107         at91_mck_init(CONFIG_SYS_MCKR_CSS);
 108
 109 #if defined(CONFIG_SYS_AT91_PLLB)
 110         /* Configure PLLB */
 111         at91_pllb_init(CONFIG_SYS_AT91_PLLB);
 112 #endif
 113
 114         /* Enable External Reset */
 115         enable_ext_reset();
 116
 117         /* Initialize matrix */
 118         matrix_init();
 119
 120         gd->arch.mck_rate_hz = CONFIG_SYS_MASTER_CLOCK;
 121         /*
 122          * init timer long enough for using in spl.
 123          */
 124         timer_init();
 125
 126         /* enable clocks for all PIOs */
 127 #if defined(CONFIG_AT91SAM9X5) || defined(CONFIG_AT91SAM9N12)
 128         at91_periph_clk_enable(ATMEL_ID_PIOAB);
 129         at91_periph_clk_enable(ATMEL_ID_PIOCD);
 130 #else
 131         at91_periph_clk_enable(ATMEL_ID_PIOA);
 132         at91_periph_clk_enable(ATMEL_ID_PIOB);
 133         at91_periph_clk_enable(ATMEL_ID_PIOC);
 134 #endif
 135
 136 #if defined(CONFIG_SPL_SERIAL_SUPPORT)
 137         /* init console */
 138         at91_seriald_hw_init();
 139         preloader_console_init();
 140 #endif
 141
 142         mem_init();
 143
 144         at91_spl_board_init();
 145 }