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