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 if (!uclass_get_device_by_of_offset(UCLASS_SPI, node, &parent)) 38 return BOOT_DEVICE_MTD_BLK_SPI_NAND; 39 40 #ifdef CONFIG_SPL_NAND_SUPPORT 41 if (!rk_nand_init()) 42 return BOOT_DEVICE_NAND; 43 #endif 44 45 /* 46 * This should eventually move into the SPL code, once SPL becomes 47 * aware of the block-device layer. Until then (and to avoid unneeded 48 * delays in getting this feature out, it lives at the board-level). 49 */ 50 if (!uclass_get_device_by_of_offset(UCLASS_MMC, node, &parent)) { 51 struct udevice *dev; 52 struct blk_desc *desc = NULL; 53 54 for (device_find_first_child(parent, &dev); 55 dev; 56 device_find_next_child(&dev)) { 57 if (device_get_uclass_id(dev) == UCLASS_BLK) { 58 desc = dev_get_uclass_platdata(dev); 59 break; 60 } 61 } 62 63 if (!desc) 64 return -ENOENT; 65 66 switch (desc->devnum) { 67 case 0: 68 return BOOT_DEVICE_MMC1; 69 case 1: 70 return BOOT_DEVICE_MMC2; 71 default: 72 return -ENOSYS; 73 } 74 } 75 76 /* 77 * SPL doesn't differentiate SPI flashes, so we keep the detection 78 * brief and inaccurate... hopefully, the common SPL layer can be 79 * extended with awareness of the BLK layer (and matching OF_CONTROL) 80 * soon. 81 */ 82 if (!uclass_get_device_by_of_offset(UCLASS_SPI_FLASH, node, &parent)) 83 return BOOT_DEVICE_SPI; 84 85 return -1; 86 } 87 88 /** 89 * board_spl_was_booted_from() - retrieves the of-path the SPL was loaded from 90 * 91 * To support a 'same-as-spl' specification in the search-order for the next 92 * stage, we need a SoC- or board-specific way to handshake with what 'came 93 * before us' (either a BROM or TPL stage) and map the info retrieved onto 94 * a OF path. 95 * 96 * Returns 97 * NULL, on failure or if the device could not be identified 98 * a of_path (a string), on success 99 */ 100 __weak const char *board_spl_was_booted_from(void) 101 { 102 debug("%s: no support for 'same-as-spl' for this board\n", __func__); 103 return NULL; 104 } 105 106 void board_boot_order(u32 *spl_boot_list) 107 { 108 const void *blob = gd->fdt_blob; 109 int chosen_node = fdt_path_offset(blob, "/chosen"); 110 int idx = 0; 111 int elem; 112 int boot_device; 113 int node; 114 const char *conf; 115 116 if (chosen_node < 0) { 117 debug("%s: /chosen not found, using spl_boot_device()\n", 118 __func__); 119 spl_boot_list[0] = spl_boot_device(); 120 return; 121 } 122 123 for (elem = 0; 124 (conf = fdt_stringlist_get(blob, chosen_node, 125 "u-boot,spl-boot-order", elem, NULL)); 126 elem++) { 127 const char *alias; 128 129 /* Handle the case of 'same device the SPL was loaded from' */ 130 if (strncmp(conf, "same-as-spl", 11) == 0) { 131 conf = board_spl_was_booted_from(); 132 if (!conf) 133 continue; 134 } 135 136 /* First check if the list element is an alias */ 137 alias = fdt_get_alias(blob, conf); 138 if (alias) 139 conf = alias; 140 141 /* Try to resolve the config item (or alias) as a path */ 142 node = fdt_path_offset(blob, conf); 143 if (node < 0) { 144 debug("%s: could not find %s in FDT", __func__, conf); 145 continue; 146 } 147 148 /* Try to map this back onto SPL boot devices */ 149 boot_device = spl_node_to_boot_device(node); 150 if (boot_device < 0) { 151 debug("%s: could not map node @%x to a boot-device\n", 152 __func__, node); 153 continue; 154 } 155 156 spl_boot_list[idx++] = boot_device; 157 } 158 159 /* If we had no matches, fall back to spl_boot_device */ 160 if (idx == 0) 161 spl_boot_list[0] = spl_boot_device(); 162 } 163 #endif 164