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 sectors = (size + info->bl_len - 1) / info->bl_len; 127 count = info->read(info, sector, sectors, fit); 128 debug("fit read sector %lx, sectors=%d, dst=%p, count=%lu\n", 129 sector, sectors, fit, count); 130 if (count == 0) 131 return -EIO; 132 133 /* find the firmware image to load */ 134 images = fdt_path_offset(fit, FIT_IMAGES_PATH); 135 if (images < 0) { 136 debug("%s: Cannot find /images node: %d\n", __func__, images); 137 return -1; 138 } 139 node = fdt_first_subnode(fit, images); 140 if (node < 0) { 141 debug("%s: Cannot find first image node: %d\n", __func__, node); 142 return -1; 143 } 144 145 /* Get its information and set up the spl_image structure */ 146 data_offset = fdt_getprop_u32(fit, node, "data-offset"); 147 data_size = fdt_getprop_u32(fit, node, "data-size"); 148 load = fdt_getprop_u32(fit, node, "load"); 149 debug("data_offset=%x, data_size=%x\n", data_offset, data_size); 150 spl_image.load_addr = load; 151 spl_image.entry_point = load; 152 spl_image.os = IH_OS_U_BOOT; 153 154 /* 155 * Work out where to place the image. We read it so that the first 156 * byte will be at 'load'. This may mean we need to load it starting 157 * before then, since we can only read whole blocks. 158 */ 159 sectors = (data_size + info->bl_len - 1) / info->bl_len; 160 data_offset += base_offset; 161 load_ptr = (void *)load; 162 debug("U-Boot size %x, data %p\n", data_size, load_ptr); 163 dst = load_ptr - (data_offset % info->bl_len); 164 165 /* Read the image */ 166 src_sector = sector + data_offset / info->bl_len; 167 debug("image: data_offset=%x, dst=%p, src_sector=%x, sectors=%x\n", 168 data_offset, dst, src_sector, sectors); 169 count = info->read(info, src_sector, sectors, dst); 170 if (count != sectors) 171 return -EIO; 172 173 /* Figure out which device tree the board wants to use */ 174 fdt_len = spl_fit_select_fdt(fit, images, &fdt_offset); 175 if (fdt_len < 0) 176 return fdt_len; 177 178 /* 179 * Read the device tree and place it after the image. There may be 180 * some extra data before it since we can only read entire blocks. 181 */ 182 dst = load_ptr + data_size; 183 fdt_offset += base_offset; 184 count = info->read(info, sector + fdt_offset / info->bl_len, sectors, 185 dst); 186 debug("fit read %x sectors to %x, dst %p, data_offset %x\n", 187 sectors, spl_image.load_addr, dst, fdt_offset); 188 if (count != sectors) 189 return -EIO; 190 191 /* 192 * Copy the device tree so that it starts immediately after the image. 193 * After this we will have the U-Boot image and its device tree ready 194 * for us to start. 195 */ 196 memcpy(dst, dst + fdt_offset % info->bl_len, fdt_len); 197 198 return 0; 199 } 200