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