Merge git://git.denx.de/u-boot-rockchip
[platform/kernel/u-boot.git] / common / spl / spl_atf.c
1 /*
2  * Reference to the ARM TF Project,
3  * plat/arm/common/arm_bl2_setup.c
4  * Portions copyright (c) 2013-2016, ARM Limited and Contributors. All rights
5  * reserved.
6  * Copyright (C) 2016 Rockchip Electronic Co.,Ltd
7  * Written by Kever Yang <kever.yang@rock-chips.com>
8  * Copyright (C) 2017 Theobroma Systems Design und Consulting GmbH
9  *
10  * SPDX-License-Identifier:     BSD-3-Clause
11  */
12
13 #include <common.h>
14 #include <atf_common.h>
15 #include <errno.h>
16 #include <spl.h>
17
18 static struct bl2_to_bl31_params_mem bl31_params_mem;
19 static struct bl31_params *bl2_to_bl31_params;
20
21 /**
22  * bl2_plat_get_bl31_params() - prepare params for bl31.
23  *
24  * This function assigns a pointer to the memory that the platform has kept
25  * aside to pass platform specific and trusted firmware related information
26  * to BL31. This memory is allocated by allocating memory to
27  * bl2_to_bl31_params_mem structure which is a superset of all the
28  * structure whose information is passed to BL31
29  * NOTE: This function should be called only once and should be done
30  * before generating params to BL31
31  *
32  * @return bl31 params structure pointer
33  */
34 static struct bl31_params *bl2_plat_get_bl31_params(uintptr_t bl33_entry)
35 {
36         struct entry_point_info *bl33_ep_info;
37
38         /*
39          * Initialise the memory for all the arguments that needs to
40          * be passed to BL31
41          */
42         memset(&bl31_params_mem, 0, sizeof(struct bl2_to_bl31_params_mem));
43
44         /* Assign memory for TF related information */
45         bl2_to_bl31_params = &bl31_params_mem.bl31_params;
46         SET_PARAM_HEAD(bl2_to_bl31_params, ATF_PARAM_BL31, ATF_VERSION_1, 0);
47
48         /* Fill BL31 related information */
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 #ifdef BL32_BASE
54         bl2_to_bl31_params->bl32_ep_info = &bl31_params_mem.bl32_ep_info;
55         SET_PARAM_HEAD(bl2_to_bl31_params->bl32_ep_info, ATF_PARAM_EP,
56                        ATF_VERSION_1, 0);
57         bl2_to_bl31_params->bl32_image_info = &bl31_params_mem.bl32_image_info;
58         SET_PARAM_HEAD(bl2_to_bl31_params->bl32_image_info,
59                        ATF_PARAM_IMAGE_BINARY, ATF_VERSION_1, 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 }