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 /* 44 * This should eventually move into the SPL code, once SPL becomes 45 * aware of the block-device layer. Until then (and to avoid unneeded 46 * delays in getting this feature out, it lives at the board-level). 47 */ 48 if (!uclass_get_device_by_of_offset(UCLASS_MMC, node, &parent)) { 49 struct udevice *dev; 50 struct blk_desc *desc = NULL; 51 52 for (device_find_first_child(parent, &dev); 53 dev; 54 device_find_next_child(&dev)) { 55 if (device_get_uclass_id(dev) == UCLASS_BLK) { 56 desc = dev_get_uclass_platdata(dev); 57 break; 58 } 59 } 60 61 if (!desc) 62 return -ENOENT; 63 64 switch (desc->devnum) { 65 case 0: 66 return BOOT_DEVICE_MMC1; 67 case 1: 68 return BOOT_DEVICE_MMC2; 69 default: 70 return -ENOSYS; 71 } 72 } 73 74 /* 75 * SPL doesn't differentiate SPI flashes, so we keep the detection 76 * brief and inaccurate... hopefully, the common SPL layer can be 77 * extended with awareness of the BLK layer (and matching OF_CONTROL) 78 * soon. 79 */ 80 if (!uclass_get_device_by_of_offset(UCLASS_SPI_FLASH, node, &parent)) 81 #ifndef CONFIG_SPL_MTD_SUPPORT 82 return BOOT_DEVICE_SPI; 83 #else 84 return BOOT_DEVICE_MTD_BLK_SPI_NOR; 85 86 if (!uclass_get_device_by_of_offset(UCLASS_MTD, node, &parent)) { 87 struct udevice *dev; 88 struct blk_desc *desc = NULL; 89 90 for (device_find_first_child(parent, &dev); 91 dev; 92 device_find_next_child(&dev)) { 93 if (device_get_uclass_id(dev) == UCLASS_BLK) { 94 desc = dev_get_uclass_platdata(dev); 95 break; 96 } 97 } 98 99 if (!desc) 100 return -ENOENT; 101 102 switch (desc->devnum) { 103 case 0: 104 return BOOT_DEVICE_MTD_BLK_NAND; 105 case 1: 106 return BOOT_DEVICE_MTD_BLK_SPI_NAND; 107 default: 108 return -ENOSYS; 109 } 110 } 111 #endif 112 113 /* 114 * This should eventually move into the SPL code, once SPL becomes 115 * aware of the block-device layer. Until then (and to avoid unneeded 116 * delays in getting this feature out, it lives at the board-level). 117 */ 118 if (!uclass_get_device_by_of_offset(UCLASS_RKNAND, node, &parent)) 119 return BOOT_DEVICE_RKNAND; 120 121 return -1; 122 } 123 124 /** 125 * board_spl_was_booted_from() - retrieves the of-path the SPL was loaded from 126 * 127 * To support a 'same-as-spl' specification in the search-order for the next 128 * stage, we need a SoC- or board-specific way to handshake with what 'came 129 * before us' (either a BROM or TPL stage) and map the info retrieved onto 130 * a OF path. 131 * 132 * Returns 133 * NULL, on failure or if the device could not be identified 134 * a of_path (a string), on success 135 */ 136 __weak const char *board_spl_was_booted_from(void) 137 { 138 debug("%s: no support for 'same-as-spl' for this board\n", __func__); 139 return NULL; 140 } 141 142 void board_boot_order(u32 *spl_boot_list) 143 { 144 const void *blob = gd->fdt_blob; 145 int chosen_node = fdt_path_offset(blob, "/chosen"); 146 int idx = 0; 147 int elem; 148 int boot_device; 149 int node; 150 const char *conf; 151 152 if (chosen_node < 0) { 153 debug("%s: /chosen not found, using spl_boot_device()\n", 154 __func__); 155 spl_boot_list[0] = spl_boot_device(); 156 return; 157 } 158 159 for (elem = 0; 160 (conf = fdt_stringlist_get(blob, chosen_node, 161 "u-boot,spl-boot-order", elem, NULL)); 162 elem++) { 163 const char *alias; 164 165 /* Handle the case of 'same device the SPL was loaded from' */ 166 if (strncmp(conf, "same-as-spl", 11) == 0) { 167 conf = board_spl_was_booted_from(); 168 if (!conf) 169 continue; 170 } 171 172 /* First check if the list element is an alias */ 173 alias = fdt_get_alias(blob, conf); 174 if (alias) 175 conf = alias; 176 177 /* Try to resolve the config item (or alias) as a path */ 178 node = fdt_path_offset(blob, conf); 179 if (node < 0) { 180 debug("%s: could not find %s in FDT", __func__, conf); 181 continue; 182 } 183 184 /* Try to map this back onto SPL boot devices */ 185 boot_device = spl_node_to_boot_device(node); 186 if (boot_device < 0) { 187 debug("%s: could not map node @%x to a boot-device\n", 188 __func__, node); 189 continue; 190 } 191 192 spl_boot_list[idx++] = boot_device; 193 } 194 195 /* If we had no matches, fall back to spl_boot_device */ 196 if (idx == 0) 197 spl_boot_list[0] = spl_boot_device(); 198 } 199 #endif 200 #endif 201