LXR uboot/common/spl/spl

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * Copyright (C) 2019 Fraunhofer AISEC,
   4 * Lukas Auer <lukas.auer@aisec.fraunhofer.de>
   5 *
   6 * Based on common/spl/spl_atf.c
   7 */
   8#include <common.h>
   9#include <cpu_func.h>
  10#include <errno.h>
  11#include <hang.h>
  12#include <spl.h>
  13#include <asm/smp.h>
  14#include <opensbi.h>
  15
  16DECLARE_GLOBAL_DATA_PTR;
  17
  18struct fw_dynamic_info opensbi_info;
  19
  20static int spl_opensbi_find_uboot_node(void *blob, int *uboot_node)
  21{
  22        int fit_images_node, node;
  23        const char *fit_os;
  24
  25        fit_images_node = fdt_path_offset(blob, "/fit-images");
  26        if (fit_images_node < 0)
  27                return -ENODEV;
  28
  29        fdt_for_each_subnode(node, blob, fit_images_node) {
  30                fit_os = fdt_getprop(blob, node, FIT_OS_PROP, NULL);
  31                if (!fit_os)
  32                        continue;
  33
  34                if (genimg_get_os_id(fit_os) == IH_OS_U_BOOT) {
  35                        *uboot_node = node;
  36                        return 0;
  37                }
  38        }
  39
  40        return -ENODEV;
  41}
  42
  43void spl_invoke_opensbi(struct spl_image_info *spl_image)
  44{
  45        int ret, uboot_node;
  46        ulong uboot_entry;
  47        void (*opensbi_entry)(ulong hartid, ulong dtb, ulong info);
  48
  49        if (!spl_image->fdt_addr) {
  50                pr_err("No device tree specified in SPL image\n");
  51                hang();
  52        }
  53
  54        /* Find U-Boot image in /fit-images */
  55        ret = spl_opensbi_find_uboot_node(spl_image->fdt_addr, &uboot_node);
  56        if (ret) {
  57                pr_err("Can't find U-Boot node, %d", ret);
  58                hang();
  59        }
  60
  61        /* Get U-Boot entry point */
  62        uboot_entry = fdt_getprop_u32(spl_image->fdt_addr, uboot_node,
  63                                      "entry-point");
  64        if (uboot_entry == FDT_ERROR)
  65                uboot_entry = fdt_getprop_u32(spl_image->fdt_addr, uboot_node,
  66                                              "load-addr");
  67
  68        /* Prepare obensbi_info object */
  69        opensbi_info.magic = FW_DYNAMIC_INFO_MAGIC_VALUE;
  70        opensbi_info.version = FW_DYNAMIC_INFO_VERSION;
  71        opensbi_info.next_addr = uboot_entry;
  72        opensbi_info.next_mode = FW_DYNAMIC_INFO_NEXT_MODE_S;
  73        opensbi_info.options = SBI_SCRATCH_NO_BOOT_PRINTS;
  74        opensbi_info.boot_hart = gd->arch.boot_hart;
  75
  76        opensbi_entry = (void (*)(ulong, ulong, ulong))spl_image->entry_point;
  77        invalidate_icache_all();
  78
  79#ifdef CONFIG_SMP
  80        /*
  81         * Start OpenSBI on all secondary harts and wait for acknowledgment.
  82         *
  83         * OpenSBI first relocates itself to its link address. This is done by
  84         * the main hart. To make sure no hart is still running U-Boot SPL
  85         * during relocation, we wait for all secondary harts to acknowledge
  86         * the call-function request before entering OpenSBI on the main hart.
  87         * Otherwise, code corruption can occur if the link address ranges of
  88         * U-Boot SPL and OpenSBI overlap.
  89         */
  90        ret = smp_call_function((ulong)spl_image->entry_point,
  91                                (ulong)spl_image->fdt_addr,
  92                                (ulong)&opensbi_info, 1);
  93        if (ret)
  94                hang();
  95#endif
  96        opensbi_entry(gd->arch.boot_hart, (ulong)spl_image->fdt_addr,
  97                      (ulong)&opensbi_info);
  98}
  99