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 } 65 66 /* 67 * SPL doesn't differentiate SPI flashes, so we keep the detection 68 * brief and inaccurate... hopefully, the common SPL layer can be 69 * extended with awareness of the BLK layer (and matching OF_CONTROL) 70 * soon. 71 */ 72 if (!uclass_get_device_by_of_offset(UCLASS_SPI_FLASH, node, &parent)) 73 return BOOT_DEVICE_SPI; 74 75 return -1; 76 } 77 78 /** 79 * board_spl_was_booted_from() - retrieves the of-path the SPL was loaded from 80 * 81 * To support a 'same-as-spl' specification in the search-order for the next 82 * stage, we need a SoC- or board-specific way to handshake with what 'came 83 * before us' (either a BROM or TPL stage) and map the info retrieved onto 84 * a OF path. 85 * 86 * Returns 87 * NULL, on failure or if the device could not be identified 88 * a of_path (a string), on success 89 */ 90 __weak const char *board_spl_was_booted_from(void) 91 { 92 debug("%s: no support for 'same-as-spl' for this board\n", __func__); 93 return NULL; 94 } 95 96 void board_boot_order(u32 *spl_boot_list) 97 { 98 const void *blob = gd->fdt_blob; 99 int chosen_node = fdt_path_offset(blob, "/chosen"); 100 int idx = 0; 101 int elem; 102 int boot_device; 103 int node; 104 const char *conf; 105 106 if (chosen_node < 0) { 107 debug("%s: /chosen not found, using spl_boot_device()\n", 108 __func__); 109 spl_boot_list[0] = spl_boot_device(); 110 return; 111 } 112 113 for (elem = 0; 114 (conf = fdt_stringlist_get(blob, chosen_node, 115 "u-boot,spl-boot-order", elem, NULL)); 116 elem++) { 117 const char *alias; 118 119 /* Handle the case of 'same device the SPL was loaded from' */ 120 if (strncmp(conf, "same-as-spl", 11) == 0) { 121 conf = board_spl_was_booted_from(); 122 if (!conf) 123 continue; 124 } 125 126 /* First check if the list element is an alias */ 127 alias = fdt_get_alias(blob, conf); 128 if (alias) 129 conf = alias; 130 131 /* Try to resolve the config item (or alias) as a path */ 132 node = fdt_path_offset(blob, conf); 133 if (node < 0) { 134 debug("%s: could not find %s in FDT", __func__, conf); 135 continue; 136 } 137 138 /* Try to map this back onto SPL boot devices */ 139 boot_device = spl_node_to_boot_device(node); 140 if (boot_device < 0) { 141 debug("%s: could not map node @%x to a boot-device\n", 142 __func__, node); 143 continue; 144 } 145 146 spl_boot_list[idx++] = boot_device; 147 } 148 149 /* If we had no matches, fall back to spl_boot_device */ 150 if (idx == 0) 151 spl_boot_list[0] = spl_boot_device(); 152 } 153 #endif 154