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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * (C) Copyright 2017 Theobroma Systems Design und Consulting GmbH
- */
- #include <common.h>
- #include <dm.h>
- #include <log.h>
- #include <mmc.h>
- #include <spl.h>
- #if CONFIG_IS_ENABLED(OF_LIBFDT)
- /**
- * 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_plat(dev);
- break;
- }
- }
- if (!desc)
- return -ENOENT;
- switch (desc->devnum) {
- case 0:
- return BOOT_DEVICE_MMC1;
- case 1:
- return BOOT_DEVICE_MMC2;
- default:
- return -ENOSYS;
- }
- } else if (!uclass_get_device_by_of_offset(UCLASS_SPI_FLASH, node,
- &parent)) {
- return BOOT_DEVICE_SPI;
- }
- /*
- * 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)
- {
- /* In case of no fdt (or only plat), use spl_boot_device() */
- if (!CONFIG_IS_ENABLED(OF_CONTROL) || CONFIG_IS_ENABLED(OF_PLATDATA)) {
- spl_boot_list[0] = spl_boot_device();
- return;
- }
- 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\n", __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
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