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         SET_PARAM_HEAD(bl2_to_bl31_params->bl31_image_info,
  49                        ATF_PARAM_IMAGE_BINARY, ATF_VERSION_1, 0);
  50
  51         /* Fill BL32 related information if it exists */
  52         bl2_to_bl31_params->bl32_ep_info = &bl31_params_mem.bl32_ep_info;
  53         SET_PARAM_HEAD(bl2_to_bl31_params->bl32_ep_info, ATF_PARAM_EP,
  54                        ATF_VERSION_1, 0);
  55         bl2_to_bl31_params->bl32_image_info = &bl31_params_mem.bl32_image_info;
  56         SET_PARAM_HEAD(bl2_to_bl31_params->bl32_image_info,
  57                        ATF_PARAM_IMAGE_BINARY, ATF_VERSION_1, 0);
  58 #ifndef BL32_BASE
  59         bl2_to_bl31_params->bl32_ep_info->pc = 0;
  60 #endif /* BL32_BASE */
  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 bl33_entry,
  89                        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(bl33_entry);
  95
  96         raw_write_daif(SPSR_EXCEPTION_MASK);
  97         dcache_disable();
  98
  99         atf_entry((void *)bl31_params, (void *)fdt_addr);
 100 }
 101
 102 static int spl_fit_images_find_uboot(void *blob)
 103 {
 104         int parent, node, ndepth;
 105         const void *data;
 106
 107         if (!blob)
 108                 return -FDT_ERR_BADMAGIC;
 109
 110         parent = fdt_path_offset(blob, "/fit-images");
 111         if (parent < 0)
 112                 return -FDT_ERR_NOTFOUND;
 113
 114         for (node = fdt_next_node(blob, parent, &ndepth);
 115              (node >= 0) && (ndepth > 0);
 116              node = fdt_next_node(blob, node, &ndepth)) {
 117                 if (ndepth != 1)
 118                         continue;
 119
 120                 data = fdt_getprop(blob, node, FIT_OS_PROP, NULL);
 121                 if (!data)
 122                         continue;
 123
 124                 if (genimg_get_os_id(data) == IH_OS_U_BOOT)
 125                         return node;
 126         };
 127
 128         return -FDT_ERR_NOTFOUND;
 129 }
 130
 131 uintptr_t spl_fit_images_get_entry(void *blob, int node)
 132 {
 133         ulong  val;
 134
 135         val = fdt_getprop_u32(blob, node, "entry-point");
 136         if (val == FDT_ERROR)
 137                 val = fdt_getprop_u32(blob, node, "load-addr");
 138
 139         debug("%s: entry point 0x%lx\n", __func__, val);
 140         return val;
 141 }
 142
 143 void spl_invoke_atf(struct spl_image_info *spl_image)
 144 {
 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 U-Boot binary (in /fit-images) load addreess or
 152          * entry point (if different) and pass it as the BL3-3 entry
 153          * point.
 154          * This will need to be extended to support Falcon mode.
 155          */
 156
 157         node = spl_fit_images_find_uboot(blob);
 158         if (node >= 0)
 159                 bl33_entry = spl_fit_images_get_entry(blob, node);
 160
 161         /*
 162          * If ATF_NO_PLATFORM_PARAM is set, we override the platform
 163          * parameter and always pass 0.  This is a workaround for
 164          * older ATF versions that have insufficiently robust (or
 165          * overzealous) argument validation.
 166          */
 167         if (CONFIG_IS_ENABLED(ATF_NO_PLATFORM_PARAM))
 168                 platform_param = 0;
 169
 170         /*
 171          * We don't provide a BL3-2 entry yet, but this will be possible
 172          * using similar logic.
 173          */
 174         bl31_entry(spl_image->entry_point, bl33_entry, platform_param);
 175 }