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 */
bl2_plat_get_bl31_params(uintptr_t bl33_entry)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
raw_write_daif(unsigned int daif)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
bl31_entry(uintptr_t bl31_entry,uintptr_t bl33_entry,uintptr_t fdt_addr)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
spl_fit_images_find_uboot(void * blob)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
spl_fit_images_get_entry(void * blob,int node)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
spl_invoke_atf(struct spl_image_info * spl_image)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 }
176