| /* |
| * (C) Copyright 2017 Theobroma Systems Design und Consulting GmbH |
| * |
| * SPDX-License-Identifier: GPL-2.0+ |
| */ |
| |
| #include <common.h> |
| #include <dm.h> |
| #include <mmc.h> |
| #include <spl.h> |
| |
| #if CONFIG_IS_ENABLED(OF_CONTROL) |
| /** |
| * spl_node_to_boot_device() - maps from a DT-node to a SPL boot device |
| * @node: of_offset of the node |
| * |
| * The SPL framework uses BOOT_DEVICE_... constants to identify its boot |
| * sources. These may take on a device-specific meaning, depending on |
| * what nodes are enabled in a DTS (e.g. BOOT_DEVICE_MMC1 may refer to |
| * different controllers/block-devices, depending on which SD/MMC controllers |
| * are enabled in any given DTS). This function maps from a DT-node back |
| * onto a BOOT_DEVICE_... constant, considering the currently active devices. |
| * |
| * Returns |
| * -ENOENT, if no device matching the node could be found |
| * -ENOSYS, if the device matching the node can not be mapped onto a |
| * SPL boot device (e.g. the third MMC device) |
| * -1, for unspecified failures |
| * a positive integer (from the BOOT_DEVICE_... family) on succes. |
| */ |
| |
| static int spl_node_to_boot_device(int node) |
| { |
| struct udevice *parent; |
| |
| /* |
| * This should eventually move into the SPL code, once SPL becomes |
| * aware of the block-device layer. Until then (and to avoid unneeded |
| * delays in getting this feature out, it lives at the board-level). |
| */ |
| if (!uclass_get_device_by_of_offset(UCLASS_MMC, node, &parent)) { |
| struct udevice *dev; |
| struct blk_desc *desc = NULL; |
| |
| for (device_find_first_child(parent, &dev); |
| dev; |
| device_find_next_child(&dev)) { |
| if (device_get_uclass_id(dev) == UCLASS_BLK) { |
| desc = dev_get_uclass_platdata(dev); |
| break; |
| } |
| } |
| |
| if (!desc) |
| return -ENOENT; |
| |
| switch (desc->devnum) { |
| case 0: |
| return BOOT_DEVICE_MMC1; |
| case 1: |
| return BOOT_DEVICE_MMC2; |
| default: |
| return -ENOSYS; |
| } |
| } |
| |
| /* |
| * SPL doesn't differentiate SPI flashes, so we keep the detection |
| * brief and inaccurate... hopefully, the common SPL layer can be |
| * extended with awareness of the BLK layer (and matching OF_CONTROL) |
| * soon. |
| */ |
| if (!uclass_get_device_by_of_offset(UCLASS_SPI_FLASH, node, &parent)) |
| return BOOT_DEVICE_SPI; |
| |
| return -1; |
| } |
| |
| /** |
| * board_spl_was_booted_from() - retrieves the of-path the SPL was loaded from |
| * |
| * To support a 'same-as-spl' specification in the search-order for the next |
| * stage, we need a SoC- or board-specific way to handshake with what 'came |
| * before us' (either a BROM or TPL stage) and map the info retrieved onto |
| * a OF path. |
| * |
| * Returns |
| * NULL, on failure or if the device could not be identified |
| * a of_path (a string), on success |
| */ |
| __weak const char *board_spl_was_booted_from(void) |
| { |
| debug("%s: no support for 'same-as-spl' for this board\n", __func__); |
| return NULL; |
| } |
| |
| void board_boot_order(u32 *spl_boot_list) |
| { |
| const void *blob = gd->fdt_blob; |
| int chosen_node = fdt_path_offset(blob, "/chosen"); |
| int idx = 0; |
| int elem; |
| int boot_device; |
| int node; |
| const char *conf; |
| |
| if (chosen_node < 0) { |
| debug("%s: /chosen not found, using spl_boot_device()\n", |
| __func__); |
| spl_boot_list[0] = spl_boot_device(); |
| return; |
| } |
| |
| for (elem = 0; |
| (conf = fdt_stringlist_get(blob, chosen_node, |
| "u-boot,spl-boot-order", elem, NULL)); |
| elem++) { |
| const char *alias; |
| |
| /* Handle the case of 'same device the SPL was loaded from' */ |
| if (strncmp(conf, "same-as-spl", 11) == 0) { |
| conf = board_spl_was_booted_from(); |
| if (!conf) |
| continue; |
| } |
| |
| /* First check if the list element is an alias */ |
| alias = fdt_get_alias(blob, conf); |
| if (alias) |
| conf = alias; |
| |
| /* Try to resolve the config item (or alias) as a path */ |
| node = fdt_path_offset(blob, conf); |
| if (node < 0) { |
| debug("%s: could not find %s in FDT", __func__, conf); |
| continue; |
| } |
| |
| /* Try to map this back onto SPL boot devices */ |
| boot_device = spl_node_to_boot_device(node); |
| if (boot_device < 0) { |
| debug("%s: could not map node @%x to a boot-device\n", |
| __func__, node); |
| continue; |
| } |
| |
| spl_boot_list[idx++] = boot_device; |
| } |
| |
| /* If we had no matches, fall back to spl_boot_device */ |
| if (idx == 0) |
| spl_boot_list[0] = spl_boot_device(); |
| } |
| #endif |