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 DECLARE_GLOBAL_DATA_PTR;
  17
  18 static u32 get_boot_device(void)
  19 {
  20         u32 val;
  21         u32 boot_device;
  22
  23         /*
  24          * First check, if UART boot-mode is active. This can only
  25          * be done, via the bootrom error register. Here the
  26          * MSB marks if the UART mode is active.
  27          */
  28         val = readl(CONFIG_BOOTROM_ERR_REG);
  29         boot_device = (val & BOOTROM_ERR_MODE_MASK) >> BOOTROM_ERR_MODE_OFFS;
  30         debug("BOOTROM_REG=0x%08x boot_device=0x%x\n", val, boot_device);
  31         if (boot_device == BOOTROM_ERR_MODE_UART)
  32                 return BOOT_DEVICE_UART;
  33
  34         /*
  35          * Now check the SAR register for the strapped boot-device
  36          */
  37         val = readl(CONFIG_SAR_REG);    /* SAR - Sample At Reset */
  38         boot_device = (val & BOOT_DEV_SEL_MASK) >> BOOT_DEV_SEL_OFFS;
  39         debug("SAR_REG=0x%08x boot_device=0x%x\n", val, boot_device);
  40         switch (boot_device) {
  41 #ifdef CONFIG_SPL_MMC_SUPPORT
  42         case BOOT_FROM_MMC:
  43         case BOOT_FROM_MMC_ALT:
  44                 return BOOT_DEVICE_MMC1;
  45 #endif
  46         case BOOT_FROM_UART:
  47                 return BOOT_DEVICE_UART;
  48         case BOOT_FROM_SPI:
  49         default:
  50                 return BOOT_DEVICE_SPI;
  51         };
  52 }
  53
  54 u32 spl_boot_device(void)
  55 {
  56         return get_boot_device();
  57 }
  58
  59 #ifdef CONFIG_SPL_MMC_SUPPORT
  60 u32 spl_boot_mode(const u32 boot_device)
  61 {
  62         return MMCSD_MODE_RAW;
  63 }
  64 #endif
  65
  66 void board_init_f(ulong dummy)
  67 {
  68         int ret;
  69
  70         /*
  71          * Pin muxing needs to be done before UART output, since
  72          * on A38x the UART pins need some re-muxing for output
  73          * to work.
  74          */
  75         board_early_init_f();
  76
  77         /* Example code showing how to enable the debug UART on MVEBU */
  78 #ifdef EARLY_UART
  79         /*
  80          * Debug UART can be used from here if required:
  81          *
  82          * debug_uart_init();
  83          * printch('a');
  84          * printhex8(0x1234);
  85          * printascii("string");
  86          */
  87 #endif
  88
  89         ret = spl_init();
  90         if (ret) {
  91                 debug("spl_init() failed: %d\n", ret);
  92                 hang();
  93         }
  94
  95         /* Use special translation offset for SPL */
  96         dm_set_translation_offset(0xd0000000 - 0xf1000000);
  97
  98         preloader_console_init();
  99
 100         timer_init();
 101
 102         /* Armada 375 does not support SerDes and DDR3 init yet */
 103 #if !defined(CONFIG_ARMADA_375)
 104         /* First init the serdes PHY's */
 105         serdes_phy_config();
 106
 107         /* Setup DDR */
 108         ddr3_init();
 109 #endif
 110
 111         /*
 112          * Return to the BootROM to continue the Marvell xmodem
 113          * UART boot protocol. As initiated by the kwboot tool.
 114          *
 115          * This can only be done by the BootROM and not by the
 116          * U-Boot SPL infrastructure, since the beginning of the
 117          * image is already read and interpreted by the BootROM.
 118          * SPL has no chance to receive this information. So we
 119          * need to return to the BootROM to enable this xmodem
 120          * UART download.
 121          */
 122         if (get_boot_device() == BOOT_DEVICE_UART)
 123                 return_to_bootrom();
 124 }