1 /* 2 * Copyright (C) 2016 Google, Inc 3 * Written by Simon Glass <sjg@chromium.org> 4 * 5 * SPDX-License-Identifier: GPL-2.0+ 6 */ 7 8 #include <common.h> 9 #include <errno.h> 10 #include <image.h> 11 #include <libfdt.h> 12 #include <spl.h> 13 14 static ulong fdt_getprop_u32(const void *fdt, int node, const char *prop) 15 { 16 const u32 *cell; 17 int len; 18 19 cell = fdt_getprop(fdt, node, prop, &len); 20 if (len != sizeof(*cell)) 21 return -1U; 22 return fdt32_to_cpu(*cell); 23 } 24 25 static int spl_fit_select_fdt(const void *fdt, int images, int *fdt_offsetp) 26 { 27 const char *name, *fdt_name; 28 int conf, node, fdt_node; 29 int len; 30 31 *fdt_offsetp = 0; 32 conf = fdt_path_offset(fdt, FIT_CONFS_PATH); 33 if (conf < 0) { 34 debug("%s: Cannot find /configurations node: %d\n", __func__, 35 conf); 36 return -EINVAL; 37 } 38 for (node = fdt_first_subnode(fdt, conf); 39 node >= 0; 40 node = fdt_next_subnode(fdt, node)) { 41 name = fdt_getprop(fdt, node, "description", &len); 42 if (!name) { 43 #ifdef CONFIG_SPL_LIBCOMMON_SUPPORT 44 printf("%s: Missing FDT description in DTB\n", 45 __func__); 46 #endif 47 return -EINVAL; 48 } 49 if (board_fit_config_name_match(name)) 50 continue; 51 52 debug("Selecting config '%s'", name); 53 fdt_name = fdt_getprop(fdt, node, FIT_FDT_PROP, &len); 54 if (!fdt_name) { 55 debug("%s: Cannot find fdt name property: %d\n", 56 __func__, len); 57 return -EINVAL; 58 } 59 60 debug(", fdt '%s'\n", fdt_name); 61 fdt_node = fdt_subnode_offset(fdt, images, fdt_name); 62 if (fdt_node < 0) { 63 debug("%s: Cannot find fdt node '%s': %d\n", 64 __func__, fdt_name, fdt_node); 65 return -EINVAL; 66 } 67 68 *fdt_offsetp = fdt_getprop_u32(fdt, fdt_node, "data-offset"); 69 len = fdt_getprop_u32(fdt, fdt_node, "data-size"); 70 #ifdef CONFIG_SPL_LIBCOMMON_SUPPORT 71 printf("FIT: Selected '%s'\n", name); 72 #endif 73 74 return len; 75 } 76 77 #ifdef CONFIG_SPL_LIBCOMMON_SUPPORT 78 printf("No matching DT out of these options:\n"); 79 for (node = fdt_first_subnode(fdt, conf); 80 node >= 0; 81 node = fdt_next_subnode(fdt, node)) { 82 name = fdt_getprop(fdt, node, "name", &len); 83 printf(" %s\n", name); 84 } 85 #endif 86 87 return -ENOENT; 88 } 89 90 int spl_load_simple_fit(struct spl_load_info *info, ulong sector, void *fit) 91 { 92 int sectors; 93 ulong size, load; 94 unsigned long count; 95 int node, images; 96 void *load_ptr; 97 int fdt_offset, fdt_len; 98 int data_offset, data_size; 99 int base_offset; 100 int src_sector; 101 void *dst; 102 103 /* 104 * Figure out where the external images start. This is the base for the 105 * data-offset properties in each image. 106 */ 107 size = fdt_totalsize(fit); 108 size = (size + 3) & ~3; 109 base_offset = (size + 3) & ~3; 110 111 /* 112 * So far we only have one block of data from the FIT. Read the entire 113 * thing, including that first block, placing it so it finishes before 114 * where we will load the image. 115 * 116 * Note that we will load the image such that its first byte will be 117 * at the load address. Since that byte may be part-way through a 118 * block, we may load the image up to one block before the load 119 * address. So take account of that here by subtracting an addition 120 * block length from the FIT start position. 121 * 122 * In fact the FIT has its own load address, but we assume it cannot 123 * be before CONFIG_SYS_TEXT_BASE. 124 */ 125 fit = (void *)(CONFIG_SYS_TEXT_BASE - size - info->bl_len); 126 fit = (void *)ALIGN((ulong)fit, 8); 127 sectors = (size + info->bl_len - 1) / info->bl_len; 128 count = info->read(info, sector, sectors, fit); 129 debug("fit read sector %lx, sectors=%d, dst=%p, count=%lu\n", 130 sector, sectors, fit, count); 131 if (count == 0) 132 return -EIO; 133 134 /* find the firmware image to load */ 135 images = fdt_path_offset(fit, FIT_IMAGES_PATH); 136 if (images < 0) { 137 debug("%s: Cannot find /images node: %d\n", __func__, images); 138 return -1; 139 } 140 node = fdt_first_subnode(fit, images); 141 if (node < 0) { 142 debug("%s: Cannot find first image node: %d\n", __func__, node); 143 return -1; 144 } 145 146 /* Get its information and set up the spl_image structure */ 147 data_offset = fdt_getprop_u32(fit, node, "data-offset"); 148 data_size = fdt_getprop_u32(fit, node, "data-size"); 149 load = fdt_getprop_u32(fit, node, "load"); 150 debug("data_offset=%x, data_size=%x\n", data_offset, data_size); 151 spl_image.load_addr = load; 152 spl_image.entry_point = load; 153 spl_image.os = IH_OS_U_BOOT; 154 155 /* 156 * Work out where to place the image. We read it so that the first 157 * byte will be at 'load'. This may mean we need to load it starting 158 * before then, since we can only read whole blocks. 159 */ 160 sectors = (data_size + info->bl_len - 1) / info->bl_len; 161 data_offset += base_offset; 162 load_ptr = (void *)load; 163 debug("U-Boot size %x, data %p\n", data_size, load_ptr); 164 dst = load_ptr - (data_offset % info->bl_len); 165 166 /* Read the image */ 167 src_sector = sector + data_offset / info->bl_len; 168 debug("image: data_offset=%x, dst=%p, src_sector=%x, sectors=%x\n", 169 data_offset, dst, src_sector, sectors); 170 count = info->read(info, src_sector, sectors, dst); 171 if (count != sectors) 172 return -EIO; 173 174 /* Figure out which device tree the board wants to use */ 175 fdt_len = spl_fit_select_fdt(fit, images, &fdt_offset); 176 if (fdt_len < 0) 177 return fdt_len; 178 179 /* 180 * Read the device tree and place it after the image. There may be 181 * some extra data before it since we can only read entire blocks. 182 */ 183 dst = load_ptr + data_size; 184 fdt_offset += base_offset; 185 count = info->read(info, sector + fdt_offset / info->bl_len, sectors, 186 dst); 187 debug("fit read %x sectors to %x, dst %p, data_offset %x\n", 188 sectors, spl_image.load_addr, dst, fdt_offset); 189 if (count != sectors) 190 return -EIO; 191 192 /* 193 * Copy the device tree so that it starts immediately after the image. 194 * After this we will have the U-Boot image and its device tree ready 195 * for us to start. 196 */ 197 memcpy(dst, dst + fdt_offset % info->bl_len, fdt_len); 198 199 return 0; 200 } 201