arch/arm/mach-mvebu/spl.c

   1 /*
   2  * Copyright (C) 2014-2016 Stefan Roese <sr@denx.de>
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0+
   5  */
   6
   7 #include <common.h>
   8 #include <dm.h>
   9 #include <debug_uart.h>
  10 #include <fdtdec.h>
  11 #include <spl.h>
  12 #include <asm/io.h>
  13 #include <asm/arch/cpu.h>
  14 #include <asm/arch/soc.h>
  15
  16 static u32 get_boot_device(void)
  17 {
  18         u32 val;
  19         u32 boot_device;
  20
  21         /*
  22          * First check, if UART boot-mode is active. This can only
  23          * be done, via the bootrom error register. Here the
  24          * MSB marks if the UART mode is active.
  25          */
  26         val = readl(CONFIG_BOOTROM_ERR_REG);
  27         boot_device = (val & BOOTROM_ERR_MODE_MASK) >> BOOTROM_ERR_MODE_OFFS;
  28         debug("BOOTROM_REG=0x%08x boot_device=0x%x\n", val, boot_device);
  29 #if defined(CONFIG_ARMADA_38X)
  30         /*
  31          * If the bootrom error register contains any else than zeros
  32          * in the first 8 bits it's an error condition. And in that case
  33          * try to boot from UART.
  34          */
  35         if (boot_device)
  36 #else
  37         if (boot_device == BOOTROM_ERR_MODE_UART)
  38 #endif
  39                 return BOOT_DEVICE_UART;
  40
  41         /*
  42          * Now check the SAR register for the strapped boot-device
  43          */
  44         val = readl(CONFIG_SAR_REG);    /* SAR - Sample At Reset */
  45         boot_device = (val & BOOT_DEV_SEL_MASK) >> BOOT_DEV_SEL_OFFS;
  46         debug("SAR_REG=0x%08x boot_device=0x%x\n", val, boot_device);
  47         switch (boot_device) {
  48 #if defined(CONFIG_ARMADA_38X)
  49         case BOOT_FROM_NAND:
  50                 return BOOT_DEVICE_NAND;
  51 #endif
  52 #ifdef CONFIG_SPL_MMC_SUPPORT
  53         case BOOT_FROM_MMC:
  54         case BOOT_FROM_MMC_ALT:
  55                 return BOOT_DEVICE_MMC1;
  56 #endif
  57         case BOOT_FROM_UART:
  58 #ifdef BOOT_FROM_UART_ALT
  59         case BOOT_FROM_UART_ALT:
  60 #endif
  61                 return BOOT_DEVICE_UART;
  62         case BOOT_FROM_SPI:
  63         default:
  64                 return BOOT_DEVICE_SPI;
  65         };
  66 }
  67
  68 u32 spl_boot_device(void)
  69 {
  70         return get_boot_device();
  71 }
  72
  73 void board_init_f(ulong dummy)
  74 {
  75         int ret;
  76
  77         /*
  78          * Pin muxing needs to be done before UART output, since
  79          * on A38x the UART pins need some re-muxing for output
  80          * to work.
  81          */
  82         board_early_init_f();
  83
  84         /* Example code showing how to enable the debug UART on MVEBU */
  85 #ifdef EARLY_UART
  86         /*
  87          * Debug UART can be used from here if required:
  88          *
  89          * debug_uart_init();
  90          * printch('a');
  91          * printhex8(0x1234);
  92          * printascii("string");
  93          */
  94 #endif
  95
  96         ret = spl_init();
  97         if (ret) {
  98                 debug("spl_init() failed: %d\n", ret);
  99                 hang();
 100         }
 101
 102         /* Use special translation offset for SPL */
 103         dm_set_translation_offset(0xd0000000 - 0xf1000000);
 104
 105         preloader_console_init();
 106
 107         timer_init();
 108
 109         /* Armada 375 does not support SerDes and DDR3 init yet */
 110 #if !defined(CONFIG_ARMADA_375)
 111         /* First init the serdes PHY's */
 112         serdes_phy_config();
 113
 114         /* Setup DDR */
 115         ddr3_init();
 116 #endif
 117
 118         /*
 119          * Return to the BootROM to continue the Marvell xmodem
 120          * UART boot protocol. As initiated by the kwboot tool.
 121          *
 122          * This can only be done by the BootROM and not by the
 123          * U-Boot SPL infrastructure, since the beginning of the
 124          * image is already read and interpreted by the BootROM.
 125          * SPL has no chance to receive this information. So we
 126          * need to return to the BootROM to enable this xmodem
 127          * UART download.
 128          *
 129          * If booting from NAND lets let the BootROM load the
 130          * rest of the bootloader.
 131          */
 132         switch (get_boot_device()) {
 133                 case BOOT_DEVICE_UART:
 134 #if defined(CONFIG_ARMADA_38X)
 135                 case BOOT_DEVICE_NAND:
 136 #endif
 137                         return_to_bootrom();
 138         }
 139 }