blob: 3543267aa574341023a7764918488592e5eec98d [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2017 Theobroma Systems Design und Consulting GmbH
*/
#include <common.h>
#include <dm.h>
#include <fdt_support.h>
#include <log.h>
#include <mmc.h>
#include <spl.h>
#include <asm/global_data.h>
#include <dm/uclass-internal.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 success.
*/
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;
}
}
/*
* 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 %s to a boot-device\n",
__func__, conf);
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();
}
int spl_decode_boot_device(u32 boot_device, char *buf, size_t buflen)
{
struct udevice *dev;
#if CONFIG_IS_ENABLED(BLK)
int dev_num;
#endif
int ret;
if (boot_device == BOOT_DEVICE_SPI) {
/* Revert spl_node_to_boot_device() logic to find appropriate SPI flash device */
/*
* Devices with multiple SPI flash devices will take the first SPI flash found in
* /chosen/u-boot,spl-boot-order.
*/
const void *blob = gd->fdt_blob;
int chosen_node = fdt_path_offset(blob, "/chosen");
int elem;
int node;
const char *conf;
if (chosen_node < 0) {
debug("%s: /chosen not found\n", __func__);
return -ENODEV;
}
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;
}
ret = uclass_find_device_by_of_offset(UCLASS_SPI_FLASH, node, &dev);
if (ret) {
debug("%s: could not find udevice for %s\n", __func__, conf);
continue;
}
return ofnode_get_path(dev_ofnode(dev), buf, buflen);
}
return -ENODEV;
}
#if CONFIG_IS_ENABLED(BLK)
dev_num = (boot_device == BOOT_DEVICE_MMC1) ? 0 : 1;
ret = blk_find_device(UCLASS_MMC, dev_num, &dev);
if (ret) {
debug("%s: could not find blk device for MMC device %d: %d\n",
__func__, dev_num, ret);
return ret;
}
dev = dev_get_parent(dev);
return ofnode_get_path(dev_ofnode(dev), buf, buflen);
#else
return -ENODEV;
#endif
}
void spl_perform_fixups(struct spl_image_info *spl_image)
{
void *blob = spl_image_fdt_addr(spl_image);
char boot_ofpath[512];
int chosen, ret;
/*
* Inject the ofpath of the device the full U-Boot (or Linux in
* Falcon-mode) was booted from into the FDT, if a FDT has been
* loaded at the same time.
*/
if (!blob)
return;
ret = spl_decode_boot_device(spl_image->boot_device, boot_ofpath, sizeof(boot_ofpath));
if (ret) {
pr_err("%s: could not map boot_device to ofpath: %d\n", __func__, ret);
return;
}
chosen = fdt_find_or_add_subnode(blob, 0, "chosen");
if (chosen < 0) {
pr_err("%s: could not find/create '/chosen'\n", __func__);
return;
}
fdt_setprop_string(blob, chosen,
"u-boot,spl-boot-device", boot_ofpath);
}
#endif