1 /* 2 * (C) Copyright 2017 Theobroma Systems Design und Consulting GmbH 3 * 4 * SPDX-License-Identifier: GPL-2.0+ 5 */ 6 7 #include <common.h> 8 #include <dm.h> 9 #include <mmc.h> 10 #include <nand.h> 11 #include <spl.h> 12 13 #ifdef CONFIG_SPL_RAM_DEVICE 14 void board_boot_order(u32 *spl_boot_list) 15 { 16 spl_boot_list[0] = BOOT_DEVICE_RAM; 17 } 18 #else 19 20 #if CONFIG_IS_ENABLED(OF_CONTROL) && ! CONFIG_IS_ENABLED(OF_PLATDATA) 21 /** 22 * spl_node_to_boot_device() - maps from a DT-node to a SPL boot device 23 * @node: of_offset of the node 24 * 25 * The SPL framework uses BOOT_DEVICE_... constants to identify its boot 26 * sources. These may take on a device-specific meaning, depending on 27 * what nodes are enabled in a DTS (e.g. BOOT_DEVICE_MMC1 may refer to 28 * different controllers/block-devices, depending on which SD/MMC controllers 29 * are enabled in any given DTS). This function maps from a DT-node back 30 * onto a BOOT_DEVICE_... constant, considering the currently active devices. 31 * 32 * Returns 33 * -ENOENT, if no device matching the node could be found 34 * -ENOSYS, if the device matching the node can not be mapped onto a 35 * SPL boot device (e.g. the third MMC device) 36 * -1, for unspecified failures 37 * a positive integer (from the BOOT_DEVICE_... family) on succes. 38 */ 39 static int spl_node_to_boot_device(int node) 40 { 41 struct udevice *parent; 42 43 if (!uclass_get_device_by_of_offset(UCLASS_UFS, node, &parent)) 44 return BOOT_DEVICE_UFS; 45 46 /* 47 * This should eventually move into the SPL code, once SPL becomes 48 * aware of the block-device layer. Until then (and to avoid unneeded 49 * delays in getting this feature out, it lives at the board-level). 50 */ 51 if (!uclass_get_device_by_of_offset(UCLASS_MMC, node, &parent)) { 52 struct udevice *dev; 53 struct blk_desc *desc = NULL; 54 55 for (device_find_first_child(parent, &dev); 56 dev; 57 device_find_next_child(&dev)) { 58 if (device_get_uclass_id(dev) == UCLASS_BLK) { 59 desc = dev_get_uclass_platdata(dev); 60 break; 61 } 62 } 63 64 if (!desc) 65 return -ENOENT; 66 67 switch (desc->devnum) { 68 case 0: 69 return BOOT_DEVICE_MMC1; 70 case 1: 71 return BOOT_DEVICE_MMC2; 72 default: 73 return -ENOSYS; 74 } 75 } 76 77 /* 78 * SPL doesn't differentiate SPI flashes, so we keep the detection 79 * brief and inaccurate... hopefully, the common SPL layer can be 80 * extended with awareness of the BLK layer (and matching OF_CONTROL) 81 * soon. 82 */ 83 if (!uclass_get_device_by_of_offset(UCLASS_SPI_FLASH, node, &parent)) 84 #ifndef CONFIG_SPL_MTD_SUPPORT 85 return BOOT_DEVICE_SPI; 86 #else 87 return BOOT_DEVICE_MTD_BLK_SPI_NOR; 88 89 if (!uclass_get_device_by_of_offset(UCLASS_MTD, node, &parent)) { 90 struct udevice *dev; 91 struct blk_desc *desc = NULL; 92 93 for (device_find_first_child(parent, &dev); 94 dev; 95 device_find_next_child(&dev)) { 96 if (device_get_uclass_id(dev) == UCLASS_BLK) { 97 desc = dev_get_uclass_platdata(dev); 98 break; 99 } 100 } 101 102 if (!desc) 103 return -ENOENT; 104 105 switch (desc->devnum) { 106 case 0: 107 return BOOT_DEVICE_MTD_BLK_NAND; 108 case 1: 109 return BOOT_DEVICE_MTD_BLK_SPI_NAND; 110 default: 111 return -ENOSYS; 112 } 113 } 114 #endif 115 116 /* 117 * This should eventually move into the SPL code, once SPL becomes 118 * aware of the block-device layer. Until then (and to avoid unneeded 119 * delays in getting this feature out, it lives at the board-level). 120 */ 121 if (!uclass_get_device_by_of_offset(UCLASS_RKNAND, node, &parent)) 122 return BOOT_DEVICE_RKNAND; 123 124 return -1; 125 } 126 127 /** 128 * board_spl_was_booted_from() - retrieves the of-path the SPL was loaded from 129 * 130 * To support a 'same-as-spl' specification in the search-order for the next 131 * stage, we need a SoC- or board-specific way to handshake with what 'came 132 * before us' (either a BROM or TPL stage) and map the info retrieved onto 133 * a OF path. 134 * 135 * Returns 136 * NULL, on failure or if the device could not be identified 137 * a of_path (a string), on success 138 */ 139 __weak const char *board_spl_was_booted_from(void) 140 { 141 debug("%s: no support for 'same-as-spl' for this board\n", __func__); 142 return NULL; 143 } 144 145 void board_boot_order(u32 *spl_boot_list) 146 { 147 const void *blob = gd->fdt_blob; 148 int chosen_node = fdt_path_offset(blob, "/chosen"); 149 int idx = 0; 150 int elem; 151 int boot_device; 152 int node; 153 const char *conf; 154 155 if (chosen_node < 0) { 156 debug("%s: /chosen not found, using spl_boot_device()\n", 157 __func__); 158 spl_boot_list[0] = spl_boot_device(); 159 return; 160 } 161 162 for (elem = 0; 163 (conf = fdt_stringlist_get(blob, chosen_node, 164 "u-boot,spl-boot-order", elem, NULL)); 165 elem++) { 166 const char *alias; 167 168 /* Handle the case of 'same device the SPL was loaded from' */ 169 if (strncmp(conf, "same-as-spl", 11) == 0) { 170 conf = board_spl_was_booted_from(); 171 if (!conf) 172 continue; 173 } 174 175 /* First check if the list element is an alias */ 176 alias = fdt_get_alias(blob, conf); 177 if (alias) 178 conf = alias; 179 180 /* Try to resolve the config item (or alias) as a path */ 181 node = fdt_path_offset(blob, conf); 182 if (node < 0) { 183 debug("%s: could not find %s in FDT", __func__, conf); 184 continue; 185 } 186 187 /* Try to map this back onto SPL boot devices */ 188 boot_device = spl_node_to_boot_device(node); 189 if (boot_device < 0) { 190 debug("%s: could not map node @%x to a boot-device\n", 191 __func__, node); 192 continue; 193 } 194 195 spl_boot_list[idx++] = boot_device; 196 } 197 198 /* If we had no matches, fall back to spl_boot_device */ 199 if (idx == 0) 200 spl_boot_list[0] = spl_boot_device(); 201 } 202 #endif 203 #endif 204