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 <image.h>
  17 #include <log.h>
  18 #include <spl.h>
  19 #include <asm/cache.h>
  20
  21 static struct bl2_to_bl31_params_mem bl31_params_mem;
  22 static struct bl31_params *bl2_to_bl31_params;
  23
  24 __weak struct bl31_params *bl2_plat_get_bl31_params(uintptr_t bl32_entry,
  25                                                     uintptr_t bl33_entry,
  26                                                     uintptr_t fdt_addr)
  27 {
  28         struct entry_point_info *bl32_ep_info;
  29         struct entry_point_info *bl33_ep_info;
  30
  31         /*
  32          * Initialise the memory for all the arguments that needs to
  33          * be passed to BL31
  34          */
  35         memset(&bl31_params_mem, 0, sizeof(struct bl2_to_bl31_params_mem));
  36
  37         /* Assign memory for TF related information */
  38         bl2_to_bl31_params = &bl31_params_mem.bl31_params;
  39         SET_PARAM_HEAD(bl2_to_bl31_params, ATF_PARAM_BL31, ATF_VERSION_1, 0);
  40
  41         /* Fill BL31 related information */
  42         bl2_to_bl31_params->bl31_image_info = &bl31_params_mem.bl31_image_info;
  43         SET_PARAM_HEAD(bl2_to_bl31_params->bl31_image_info,
  44                        ATF_PARAM_IMAGE_BINARY, ATF_VERSION_1, 0);
  45
  46         /* Fill BL32 related information */
  47         bl2_to_bl31_params->bl32_ep_info = &bl31_params_mem.bl32_ep_info;
  48         bl32_ep_info = &bl31_params_mem.bl32_ep_info;
  49         SET_PARAM_HEAD(bl32_ep_info, ATF_PARAM_EP, ATF_VERSION_1,
  50                        ATF_EP_SECURE);
  51
  52         /* secure payload is optional, so set pc to 0 if absent */
  53         bl32_ep_info->args.arg3 = fdt_addr;
  54         bl32_ep_info->pc = bl32_entry ? bl32_entry : 0;
  55         bl32_ep_info->spsr = SPSR_64(MODE_EL1, MODE_SP_ELX,
  56                                      DISABLE_ALL_EXECPTIONS);
  57
  58         bl2_to_bl31_params->bl32_image_info = &bl31_params_mem.bl32_image_info;
  59         SET_PARAM_HEAD(bl2_to_bl31_params->bl32_image_info,
  60                        ATF_PARAM_IMAGE_BINARY, ATF_VERSION_1, 0);
  61
  62         /* Fill BL33 related information */
  63         bl2_to_bl31_params->bl33_ep_info = &bl31_params_mem.bl33_ep_info;
  64         bl33_ep_info = &bl31_params_mem.bl33_ep_info;
  65         SET_PARAM_HEAD(bl33_ep_info, ATF_PARAM_EP, ATF_VERSION_1,
  66                        ATF_EP_NON_SECURE);
  67
  68         /* BL33 expects to receive the primary CPU MPID (through x0) */
  69         bl33_ep_info->args.arg0 = 0xffff & read_mpidr();
  70         bl33_ep_info->pc = bl33_entry;
  71         bl33_ep_info->spsr = SPSR_64(MODE_EL2, MODE_SP_ELX,
  72                                      DISABLE_ALL_EXECPTIONS);
  73
  74         bl2_to_bl31_params->bl33_image_info = &bl31_params_mem.bl33_image_info;
  75         SET_PARAM_HEAD(bl2_to_bl31_params->bl33_image_info,
  76                        ATF_PARAM_IMAGE_BINARY, ATF_VERSION_1, 0);
  77
  78         return bl2_to_bl31_params;
  79 }
  80
  81 static inline void raw_write_daif(unsigned int daif)
  82 {
  83         __asm__ __volatile__("msr DAIF, %0\n\t" : : "r" (daif) : "memory");
  84 }
  85
  86 typedef void (*atf_entry_t)(struct bl31_params *params, void *plat_params);
  87
  88 static void bl31_entry(uintptr_t bl31_entry, uintptr_t bl32_entry,
  89                        uintptr_t bl33_entry, uintptr_t fdt_addr)
  90 {
  91         struct bl31_params *bl31_params;
  92         atf_entry_t  atf_entry = (atf_entry_t)bl31_entry;
  93
  94         bl31_params = bl2_plat_get_bl31_params(bl32_entry, bl33_entry,
  95                                                fdt_addr);
  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(void *blob, int os)
 104 {
 105         int parent, node, ndepth = 0;
 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) == os)
 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  bl32_entry = 0;
 147         uintptr_t  bl33_entry = CONFIG_SYS_TEXT_BASE;
 148         void *blob = spl_image->fdt_addr;
 149         uintptr_t platform_param = (uintptr_t)blob;
 150         int node;
 151
 152         /*
 153          * Find the OP-TEE binary (in /fit-images) load address or
 154          * entry point (if different) and pass it as the BL3-2 entry
 155          * point, this is optional.
 156          */
 157         node = spl_fit_images_find(blob, IH_OS_TEE);
 158         if (node >= 0)
 159                 bl32_entry = spl_fit_images_get_entry(blob, node);
 160
 161         /*
 162          * Find the U-Boot binary (in /fit-images) load addreess or
 163          * entry point (if different) and pass it as the BL3-3 entry
 164          * point.
 165          * This will need to be extended to support Falcon mode.
 166          */
 167
 168         node = spl_fit_images_find(blob, IH_OS_U_BOOT);
 169         if (node >= 0)
 170                 bl33_entry = spl_fit_images_get_entry(blob, node);
 171
 172         /*
 173          * If ATF_NO_PLATFORM_PARAM is set, we override the platform
 174          * parameter and always pass 0.  This is a workaround for
 175          * older ATF versions that have insufficiently robust (or
 176          * overzealous) argument validation.
 177          */
 178         if (CONFIG_IS_ENABLED(ATF_NO_PLATFORM_PARAM))
 179                 platform_param = 0;
 180
 181         /*
 182          * We don't provide a BL3-2 entry yet, but this will be possible
 183          * using similar logic.
 184          */
 185         bl31_entry(spl_image->entry_point, bl32_entry,
 186                    bl33_entry, platform_param);
 187 }