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 <image.h>
  13 #include <spl.h>
  14 #include <asm/smp.h>
  15 #include <opensbi.h>
  16 #include <linux/libfdt.h>
  17
  18 DECLARE_GLOBAL_DATA_PTR;
  19
  20 struct fw_dynamic_info opensbi_info;
  21
  22 static int spl_opensbi_find_uboot_node(void *blob, int *uboot_node)
  23 {
  24         int fit_images_node, node;
  25         const char *fit_os;
  26
  27         fit_images_node = fdt_path_offset(blob, "/fit-images");
  28         if (fit_images_node < 0)
  29                 return -ENODEV;
  30
  31         fdt_for_each_subnode(node, blob, fit_images_node) {
  32                 fit_os = fdt_getprop(blob, node, FIT_OS_PROP, NULL);
  33                 if (!fit_os)
  34                         continue;
  35
  36                 if (genimg_get_os_id(fit_os) == IH_OS_U_BOOT) {
  37                         *uboot_node = node;
  38                         return 0;
  39                 }
  40         }
  41
  42         return -ENODEV;
  43 }
  44
  45 void spl_invoke_opensbi(struct spl_image_info *spl_image)
  46 {
  47         int ret, uboot_node;
  48         ulong uboot_entry;
  49         void (*opensbi_entry)(ulong hartid, ulong dtb, ulong info);
  50
  51         if (!spl_image->fdt_addr) {
  52                 pr_err("No device tree specified in SPL image\n");
  53                 hang();
  54         }
  55
  56         /* Find U-Boot image in /fit-images */
  57         ret = spl_opensbi_find_uboot_node(spl_image->fdt_addr, &uboot_node);
  58         if (ret) {
  59                 pr_err("Can't find U-Boot node, %d", ret);
  60                 hang();
  61         }
  62
  63         /* Get U-Boot entry point */
  64         uboot_entry = fdt_getprop_u32(spl_image->fdt_addr, uboot_node,
  65                                       "entry-point");
  66         if (uboot_entry == FDT_ERROR)
  67                 uboot_entry = fdt_getprop_u32(spl_image->fdt_addr, uboot_node,
  68                                               "load-addr");
  69
  70         /* Prepare obensbi_info object */
  71         opensbi_info.magic = FW_DYNAMIC_INFO_MAGIC_VALUE;
  72         opensbi_info.version = FW_DYNAMIC_INFO_VERSION;
  73         opensbi_info.next_addr = uboot_entry;
  74         opensbi_info.next_mode = FW_DYNAMIC_INFO_NEXT_MODE_S;
  75         opensbi_info.options = SBI_SCRATCH_NO_BOOT_PRINTS;
  76         opensbi_info.boot_hart = gd->arch.boot_hart;
  77
  78         opensbi_entry = (void (*)(ulong, ulong, ulong))spl_image->entry_point;
  79         invalidate_icache_all();
  80
  81 #ifdef CONFIG_SPL_SMP
  82         /*
  83          * Start OpenSBI on all secondary harts and wait for acknowledgment.
  84          *
  85          * OpenSBI first relocates itself to its link address. This is done by
  86          * the main hart. To make sure no hart is still running U-Boot SPL
  87          * during relocation, we wait for all secondary harts to acknowledge
  88          * the call-function request before entering OpenSBI on the main hart.
  89          * Otherwise, code corruption can occur if the link address ranges of
  90          * U-Boot SPL and OpenSBI overlap.
  91          */
  92         ret = smp_call_function((ulong)spl_image->entry_point,
  93                                 (ulong)spl_image->fdt_addr,
  94                                 (ulong)&opensbi_info, 1);
  95         if (ret)
  96                 hang();
  97 #endif
  98         opensbi_entry(gd->arch.boot_hart, (ulong)spl_image->fdt_addr,
  99                       (ulong)&opensbi_info);
 100 }