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https://github.com/brain-hackers/u-boot-brain
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dbad01cab5
In the expectation that the spl-boot-order code will eventually gain use outside of mach-rockchip: let's add documentation on the spl_node_to_boot_device() function, which is likely to become a publicly exported function. Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com> Reviewed-by: Simon Glass <sjg@chromium.org>
128 lines
3.3 KiB
C
128 lines
3.3 KiB
C
/*
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* (C) Copyright 2017 Theobroma Systems Design und Consulting GmbH
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <dm.h>
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#include <mmc.h>
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#include <spl.h>
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#if CONFIG_IS_ENABLED(OF_CONTROL)
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/**
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* spl_node_to_boot_device() - maps from a DT-node to a SPL boot device
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* @node: of_offset of the node
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*
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* The SPL framework uses BOOT_DEVICE_... constants to identify its boot
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* sources. These may take on a device-specific meaning, depending on
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* what nodes are enabled in a DTS (e.g. BOOT_DEVICE_MMC1 may refer to
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* different controllers/block-devices, depending on which SD/MMC controllers
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* are enabled in any given DTS). This function maps from a DT-node back
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* onto a BOOT_DEVICE_... constant, considering the currently active devices.
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*
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* Returns
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* -ENOENT, if no device matching the node could be found
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* -ENOSYS, if the device matching the node can not be mapped onto a
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* SPL boot device (e.g. the third MMC device)
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* -1, for unspecified failures
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* a positive integer (from the BOOT_DEVICE_... family) on succes.
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*/
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static int spl_node_to_boot_device(int node)
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{
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struct udevice *parent;
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/*
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* This should eventually move into the SPL code, once SPL becomes
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* aware of the block-device layer. Until then (and to avoid unneeded
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* delays in getting this feature out, it lives at the board-level).
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*/
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if (!uclass_get_device_by_of_offset(UCLASS_MMC, node, &parent)) {
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struct udevice *dev;
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struct blk_desc *desc = NULL;
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for (device_find_first_child(parent, &dev);
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dev;
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device_find_next_child(&dev)) {
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if (device_get_uclass_id(dev) == UCLASS_BLK) {
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desc = dev_get_uclass_platdata(dev);
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break;
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}
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}
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if (!desc)
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return -ENOENT;
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switch (desc->devnum) {
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case 0:
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return BOOT_DEVICE_MMC1;
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case 1:
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return BOOT_DEVICE_MMC2;
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default:
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return -ENOSYS;
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}
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}
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/*
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* SPL doesn't differentiate SPI flashes, so we keep the detection
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* brief and inaccurate... hopefully, the common SPL layer can be
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* extended with awareness of the BLK layer (and matching OF_CONTROL)
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* soon.
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*/
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if (!uclass_get_device_by_of_offset(UCLASS_SPI_FLASH, node, &parent))
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return BOOT_DEVICE_SPI;
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return -1;
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}
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void board_boot_order(u32 *spl_boot_list)
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{
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const void *blob = gd->fdt_blob;
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int chosen_node = fdt_path_offset(blob, "/chosen");
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int idx = 0;
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int elem;
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int boot_device;
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int node;
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const char *conf;
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if (chosen_node < 0) {
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debug("%s: /chosen not found, using spl_boot_device()\n",
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__func__);
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spl_boot_list[0] = spl_boot_device();
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return;
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}
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for (elem = 0;
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(conf = fdt_stringlist_get(blob, chosen_node,
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"u-boot,spl-boot-order", elem, NULL));
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elem++) {
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/* First check if the list element is an alias */
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const char *alias = fdt_get_alias(blob, conf);
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if (alias)
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conf = alias;
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/* Try to resolve the config item (or alias) as a path */
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node = fdt_path_offset(blob, conf);
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if (node < 0) {
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debug("%s: could not find %s in FDT", __func__, conf);
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continue;
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}
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/* Try to map this back onto SPL boot devices */
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boot_device = spl_node_to_boot_device(node);
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if (boot_device < 0) {
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debug("%s: could not map node @%x to a boot-device\n",
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__func__, node);
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continue;
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}
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spl_boot_list[idx++] = boot_device;
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}
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/* If we had no matches, fall back to spl_boot_device */
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if (idx == 0)
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spl_boot_list[0] = spl_boot_device();
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}
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#endif
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