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 <cpu_func.h>
  15 #include <errno.h>
  16 #include <spl.h>
  17 #include <asm/cache.h>
  18
  19 static struct bl2_to_bl31_params_mem bl31_params_mem;
  20 static struct bl31_params *bl2_to_bl31_params;
  21
  22 __weak struct bl31_params *bl2_plat_get_bl31_params(uintptr_t bl32_entry,
  23                                                     uintptr_t bl33_entry,
  24                                                     uintptr_t fdt_addr)
  25 {
  26         struct entry_point_info *bl32_ep_info;
  27         struct entry_point_info *bl33_ep_info;
  28
  29         /*
  30          * Initialise the memory for all the arguments that needs to
  31          * be passed to BL31
  32          */
  33         memset(&bl31_params_mem, 0, sizeof(struct bl2_to_bl31_params_mem));
  34
  35         /* Assign memory for TF related information */
  36         bl2_to_bl31_params = &bl31_params_mem.bl31_params;
  37         SET_PARAM_HEAD(bl2_to_bl31_params, ATF_PARAM_BL31, ATF_VERSION_1, 0);
  38
  39         /* Fill BL31 related information */
  40         bl2_to_bl31_params->bl31_image_info = &bl31_params_mem.bl31_image_info;
  41         SET_PARAM_HEAD(bl2_to_bl31_params->bl31_image_info,
  42                        ATF_PARAM_IMAGE_BINARY, ATF_VERSION_1, 0);
  43
  44         /* Fill BL32 related information */
  45         bl2_to_bl31_params->bl32_ep_info = &bl31_params_mem.bl32_ep_info;
  46         bl32_ep_info = &bl31_params_mem.bl32_ep_info;
  47         SET_PARAM_HEAD(bl32_ep_info, ATF_PARAM_EP, ATF_VERSION_1,
  48                        ATF_EP_SECURE);
  49
  50         /* secure payload is optional, so set pc to 0 if absent */
  51         bl32_ep_info->args.arg3 = fdt_addr;
  52         bl32_ep_info->pc = bl32_entry ? bl32_entry : 0;
  53         bl32_ep_info->spsr = SPSR_64(MODE_EL1, MODE_SP_ELX,
  54                                      DISABLE_ALL_EXECPTIONS);
  55
  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
  60         /* Fill BL33 related information */
  61         bl2_to_bl31_params->bl33_ep_info = &bl31_params_mem.bl33_ep_info;
  62         bl33_ep_info = &bl31_params_mem.bl33_ep_info;
  63         SET_PARAM_HEAD(bl33_ep_info, ATF_PARAM_EP, ATF_VERSION_1,
  64                        ATF_EP_NON_SECURE);
  65
  66         /* BL33 expects to receive the primary CPU MPID (through x0) */
  67         bl33_ep_info->args.arg0 = 0xffff & read_mpidr();
  68         bl33_ep_info->pc = bl33_entry;
  69         bl33_ep_info->spsr = SPSR_64(MODE_EL2, MODE_SP_ELX,
  70                                      DISABLE_ALL_EXECPTIONS);
  71
  72         bl2_to_bl31_params->bl33_image_info = &bl31_params_mem.bl33_image_info;
  73         SET_PARAM_HEAD(bl2_to_bl31_params->bl33_image_info,
  74                        ATF_PARAM_IMAGE_BINARY, ATF_VERSION_1, 0);
  75
  76         return bl2_to_bl31_params;
  77 }
  78
  79 static inline void raw_write_daif(unsigned int daif)
  80 {
  81         __asm__ __volatile__("msr DAIF, %0\n\t" : : "r" (daif) : "memory");
  82 }
  83
  84 typedef void (*atf_entry_t)(struct bl31_params *params, void *plat_params);
  85
  86 static void bl31_entry(uintptr_t bl31_entry, uintptr_t bl32_entry,
  87                        uintptr_t bl33_entry, uintptr_t fdt_addr)
  88 {
  89         struct bl31_params *bl31_params;
  90         atf_entry_t  atf_entry = (atf_entry_t)bl31_entry;
  91
  92         bl31_params = bl2_plat_get_bl31_params(bl32_entry, bl33_entry,
  93                                                fdt_addr);
  94
  95         raw_write_daif(SPSR_EXCEPTION_MASK);
  96         dcache_disable();
  97
  98         atf_entry((void *)bl31_params, (void *)fdt_addr);
  99 }
 100
 101 static int spl_fit_images_find(void *blob, int os)
 102 {
 103         int parent, node, ndepth = 0;
 104         const void *data;
 105
 106         if (!blob)
 107                 return -FDT_ERR_BADMAGIC;
 108
 109         parent = fdt_path_offset(blob, "/fit-images");
 110         if (parent < 0)
 111                 return -FDT_ERR_NOTFOUND;
 112
 113         for (node = fdt_next_node(blob, parent, &ndepth);
 114              (node >= 0) && (ndepth > 0);
 115              node = fdt_next_node(blob, node, &ndepth)) {
 116                 if (ndepth != 1)
 117                         continue;
 118
 119                 data = fdt_getprop(blob, node, FIT_OS_PROP, NULL);
 120                 if (!data)
 121                         continue;
 122
 123                 if (genimg_get_os_id(data) == os)
 124                         return node;
 125         };
 126
 127         return -FDT_ERR_NOTFOUND;
 128 }
 129
 130 uintptr_t spl_fit_images_get_entry(void *blob, int node)
 131 {
 132         ulong  val;
 133
 134         val = fdt_getprop_u32(blob, node, "entry-point");
 135         if (val == FDT_ERROR)
 136                 val = fdt_getprop_u32(blob, node, "load-addr");
 137
 138         debug("%s: entry point 0x%lx\n", __func__, val);
 139         return val;
 140 }
 141
 142 void spl_invoke_atf(struct spl_image_info *spl_image)
 143 {
 144         uintptr_t  bl32_entry = 0;
 145         uintptr_t  bl33_entry = CONFIG_SYS_TEXT_BASE;
 146         void *blob = spl_image->fdt_addr;
 147         uintptr_t platform_param = (uintptr_t)blob;
 148         int node;
 149
 150         /*
 151          * Find the OP-TEE binary (in /fit-images) load address or
 152          * entry point (if different) and pass it as the BL3-2 entry
 153          * point, this is optional.
 154          */
 155         node = spl_fit_images_find(blob, IH_OS_TEE);
 156         if (node >= 0)
 157                 bl32_entry = spl_fit_images_get_entry(blob, node);
 158
 159         /*
 160          * Find the U-Boot binary (in /fit-images) load addreess or
 161          * entry point (if different) and pass it as the BL3-3 entry
 162          * point.
 163          * This will need to be extended to support Falcon mode.
 164          */
 165
 166         node = spl_fit_images_find(blob, IH_OS_U_BOOT);
 167         if (node >= 0)
 168                 bl33_entry = spl_fit_images_get_entry(blob, node);
 169
 170         /*
 171          * If ATF_NO_PLATFORM_PARAM is set, we override the platform
 172          * parameter and always pass 0.  This is a workaround for
 173          * older ATF versions that have insufficiently robust (or
 174          * overzealous) argument validation.
 175          */
 176         if (CONFIG_IS_ENABLED(ATF_NO_PLATFORM_PARAM))
 177                 platform_param = 0;
 178
 179         /*
 180          * We don't provide a BL3-2 entry yet, but this will be possible
 181          * using similar logic.
 182          */
 183         bl31_entry(spl_image->entry_point, bl32_entry,
 184                    bl33_entry, platform_param);
 185 }