common/spl/spl_atf.c

   1 // SPDX-License-Identifier: BSD-3-Clause
   2 /*
   3  * Reference to the ARM TF Project,
   4  * plat/arm/common/arm_bl2_setup.c
   5  * Portions copyright (c) 2013-2016, ARM Limited and Contributors. All rights
   6  * reserved.
   7  * Copyright (C) 2016 Rockchip Electronic Co.,Ltd
   8  * Written by Kever Yang <kever.yang@rock-chips.com>
   9  * Copyright (C) 2017 Theobroma Systems Design und Consulting GmbH
  10  */
  11
  12 #include <common.h>
  13 #include <atf_common.h>
  14 #include <errno.h>
  15 #include <spl.h>
  16
  17 static struct bl2_to_bl31_params_mem bl31_params_mem;
  18 static struct bl31_params *bl2_to_bl31_params;
  19
  20 /**
  21  * bl2_plat_get_bl31_params() - prepare params for bl31.
  22  *
  23  * This function assigns a pointer to the memory that the platform has kept
  24  * aside to pass platform specific and trusted firmware related information
  25  * to BL31. This memory is allocated by allocating memory to
  26  * bl2_to_bl31_params_mem structure which is a superset of all the
  27  * structure whose information is passed to BL31
  28  * NOTE: This function should be called only once and should be done
  29  * before generating params to BL31
  30  *
  31  * @return bl31 params structure pointer
  32  */
  33 static struct bl31_params *bl2_plat_get_bl31_params(uintptr_t bl33_entry)
  34 {
  35         struct entry_point_info *bl33_ep_info;
  36
  37         /*
  38          * Initialise the memory for all the arguments that needs to
  39          * be passed to BL31
  40          */
  41         memset(&bl31_params_mem, 0, sizeof(struct bl2_to_bl31_params_mem));
  42
  43         /* Assign memory for TF related information */
  44         bl2_to_bl31_params = &bl31_params_mem.bl31_params;
  45         SET_PARAM_HEAD(bl2_to_bl31_params, ATF_PARAM_BL31, ATF_VERSION_1, 0);
  46
  47         /* Fill BL31 related information */
  48         bl2_to_bl31_params->bl31_image_info = &bl31_params_mem.bl31_image_info;
  49         SET_PARAM_HEAD(bl2_to_bl31_params->bl31_image_info,
  50                        ATF_PARAM_IMAGE_BINARY, ATF_VERSION_1, 0);
  51
  52         /* Fill BL32 related information if it exists */
  53         bl2_to_bl31_params->bl32_ep_info = &bl31_params_mem.bl32_ep_info;
  54         SET_PARAM_HEAD(bl2_to_bl31_params->bl32_ep_info, ATF_PARAM_EP,
  55                        ATF_VERSION_1, 0);
  56         bl2_to_bl31_params->bl32_image_info = &bl31_params_mem.bl32_image_info;
  57         SET_PARAM_HEAD(bl2_to_bl31_params->bl32_image_info,
  58                        ATF_PARAM_IMAGE_BINARY, ATF_VERSION_1, 0);
  59 #ifndef BL32_BASE
  60         bl2_to_bl31_params->bl32_ep_info->pc = 0;
  61 #endif /* BL32_BASE */
  62
  63         /* Fill BL33 related information */
  64         bl2_to_bl31_params->bl33_ep_info = &bl31_params_mem.bl33_ep_info;
  65         bl33_ep_info = &bl31_params_mem.bl33_ep_info;
  66         SET_PARAM_HEAD(bl33_ep_info, ATF_PARAM_EP, ATF_VERSION_1,
  67                        ATF_EP_NON_SECURE);
  68
  69         /* BL33 expects to receive the primary CPU MPID (through x0) */
  70         bl33_ep_info->args.arg0 = 0xffff & read_mpidr();
  71         bl33_ep_info->pc = bl33_entry;
  72         bl33_ep_info->spsr = SPSR_64(MODE_EL2, MODE_SP_ELX,
  73                                      DISABLE_ALL_EXECPTIONS);
  74
  75         bl2_to_bl31_params->bl33_image_info = &bl31_params_mem.bl33_image_info;
  76         SET_PARAM_HEAD(bl2_to_bl31_params->bl33_image_info,
  77                        ATF_PARAM_IMAGE_BINARY, ATF_VERSION_1, 0);
  78
  79         return bl2_to_bl31_params;
  80 }
  81
  82 static inline void raw_write_daif(unsigned int daif)
  83 {
  84         __asm__ __volatile__("msr DAIF, %0\n\t" : : "r" (daif) : "memory");
  85 }
  86
  87 typedef void (*atf_entry_t)(struct bl31_params *params, void *plat_params);
  88
  89 static void bl31_entry(uintptr_t bl31_entry, uintptr_t bl33_entry,
  90                        uintptr_t fdt_addr)
  91 {
  92         struct bl31_params *bl31_params;
  93         atf_entry_t  atf_entry = (atf_entry_t)bl31_entry;
  94
  95         bl31_params = bl2_plat_get_bl31_params(bl33_entry);
  96
  97         raw_write_daif(SPSR_EXCEPTION_MASK);
  98         dcache_disable();
  99
 100         atf_entry((void *)bl31_params, (void *)fdt_addr);
 101 }
 102
 103 static int spl_fit_images_find_uboot(void *blob)
 104 {
 105         int parent, node, ndepth;
 106         const void *data;
 107
 108         if (!blob)
 109                 return -FDT_ERR_BADMAGIC;
 110
 111         parent = fdt_path_offset(blob, "/fit-images");
 112         if (parent < 0)
 113                 return -FDT_ERR_NOTFOUND;
 114
 115         for (node = fdt_next_node(blob, parent, &ndepth);
 116              (node >= 0) && (ndepth > 0);
 117              node = fdt_next_node(blob, node, &ndepth)) {
 118                 if (ndepth != 1)
 119                         continue;
 120
 121                 data = fdt_getprop(blob, node, FIT_OS_PROP, NULL);
 122                 if (!data)
 123                         continue;
 124
 125                 if (genimg_get_os_id(data) == IH_OS_U_BOOT)
 126                         return node;
 127         };
 128
 129         return -FDT_ERR_NOTFOUND;
 130 }
 131
 132 uintptr_t spl_fit_images_get_entry(void *blob, int node)
 133 {
 134         ulong  val;
 135
 136         val = fdt_getprop_u32(blob, node, "entry-point");
 137         if (val == FDT_ERROR)
 138                 val = fdt_getprop_u32(blob, node, "load-addr");
 139
 140         debug("%s: entry point 0x%lx\n", __func__, val);
 141         return val;
 142 }
 143
 144 void spl_invoke_atf(struct spl_image_info *spl_image)
 145 {
 146         uintptr_t  bl33_entry = CONFIG_SYS_TEXT_BASE;
 147         void *blob = spl_image->fdt_addr;
 148         uintptr_t platform_param = (uintptr_t)blob;
 149         int node;
 150
 151         /*
 152          * Find the U-Boot binary (in /fit-images) load addreess or
 153          * entry point (if different) and pass it as the BL3-3 entry
 154          * point.
 155          * This will need to be extended to support Falcon mode.
 156          */
 157
 158         node = spl_fit_images_find_uboot(blob);
 159         if (node >= 0)
 160                 bl33_entry = spl_fit_images_get_entry(blob, node);
 161
 162         /*
 163          * If ATF_NO_PLATFORM_PARAM is set, we override the platform
 164          * parameter and always pass 0.  This is a workaround for
 165          * older ATF versions that have insufficiently robust (or
 166          * overzealous) argument validation.
 167          */
 168         if (CONFIG_IS_ENABLED(ATF_NO_PLATFORM_PARAM))
 169                 platform_param = 0;
 170
 171         /*
 172          * We don't provide a BL3-2 entry yet, but this will be possible
 173          * using similar logic.
 174          */
 175         bl31_entry(spl_image->entry_point, bl33_entry, platform_param);
 176 }