common/spl/spl_opensbi.c

   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
  16 DECLARE_GLOBAL_DATA_PTR;
  17
  18 struct fw_dynamic_info opensbi_info;
  19
  20 static 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
  43 void 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_SPL_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 }