--- /dev/null
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Capsule update support for Qualcomm boards.
+ *
+ * Copyright (c) 2024 Linaro Ltd.
+ * Author: Caleb Connolly <caleb.connolly@linaro.org>
+ */
+
+#define pr_fmt(fmt) "QCOM-FMP: " fmt
+
+#include <dm/device.h>
+#include <dm/uclass.h>
+#include <efi.h>
+#include <efi_loader.h>
+#include <malloc.h>
+#include <scsi.h>
+#include <part.h>
+#include <linux/err.h>
+
+#include "qcom-priv.h"
+
+/*
+ * NOTE: for now this implementation only supports the rb3gen2. Supporting other
+ * boards that boot in different ways (e.g. chainloaded from ABL) will require
+ * additional complexity to properly create the dfu string and fw_images array.
+ */
+
+/*
+ * To handle different variants like chainloaded U-Boot here we'll need to
+ * build the fw_images array dynamically at runtime. It looks like
+ * mach-rockchip is a good example for how to do this.
+ * Detecting which image types a board uses is TBD, hence for now we only
+ * support the one new board that runs U-Boot as its primary bootloader.
+ */
+struct efi_fw_image fw_images[] = {
+ {
+ /* U-Boot flashed to the uefi_X partition (e.g. rb3gen2) */
+ .fw_name = u"UBOOT_UEFI_PARTITION",
+ .image_index = 1,
+ },
+};
+
+struct efi_capsule_update_info update_info = {
+ /* Filled in by configure_dfu_string() */
+ .dfu_string = NULL,
+ .num_images = ARRAY_SIZE(fw_images),
+ .images = fw_images,
+};
+
+/* LSB first */
+struct part_slot_status {
+ u16: 2;
+ u16 active : 1;
+ u16: 3;
+ u16 successful : 1;
+ u16 unbootable : 1;
+ u16 tries_remaining : 4;
+};
+
+static int find_boot_partition(const char *partname, struct blk_desc *blk_dev, char *name)
+{
+ int ret;
+ int partnum;
+ struct disk_partition info;
+ struct part_slot_status *slot_status;
+
+ for (partnum = 1;; partnum++) {
+ ret = part_get_info(blk_dev, partnum, &info);
+ if (ret)
+ return ret;
+
+ slot_status = (struct part_slot_status *)&info.type_flags;
+ log_io("%16s: Active: %1d, Successful: %1d, Unbootable: %1d, Tries left: %1d\n",
+ info.name, slot_status->active,
+ slot_status->successful, slot_status->unbootable,
+ slot_status->tries_remaining);
+ /*
+ * FIXME: eventually we'll want to find the active/inactive variant of the partition
+ * but on the rb3gen2 these values might all be 0
+ */
+ if (!strncmp(info.name, partname, strlen(partname))) {
+ log_debug("Found active %s partition: '%s'!\n", partname, info.name);
+ strlcpy(name, info.name, sizeof(info.name));
+ return partnum;
+ }
+ }
+
+ return -1;
+}
+
+/**
+ * qcom_configure_capsule_updates() - Configure the DFU string for capsule updates
+ *
+ * U-Boot is flashed to the boot partition on Qualcomm boards. In most cases there
+ * are two boot partitions, boot_a and boot_b. As we don't currently support doing
+ * full A/B updates, we only support updating the currently active boot partition.
+ *
+ * So we need to find the current slot suffix and the associated boot partition.
+ * We do this by looking for the boot partition that has the 'active' flag set
+ * in the GPT partition vendor attribute bits.
+ */
+void qcom_configure_capsule_updates(void)
+{
+ struct blk_desc *desc;
+ int ret = 0, partnum = -1, devnum;
+ static char dfu_string[32] = { 0 };
+ char name[32]; /* GPT partition name */
+ char *partname = "uefi_a";
+ struct udevice *dev = NULL;
+
+ if (IS_ENABLED(CONFIG_SCSI)) {
+ /* Scan for SCSI devices */
+ ret = scsi_scan(false);
+ if (ret) {
+ debug("Failed to scan SCSI devices: %d\n", ret);
+ return;
+ }
+ }
+
+ uclass_foreach_dev_probe(UCLASS_BLK, dev) {
+ if (device_get_uclass_id(dev) != UCLASS_BLK)
+ continue;
+
+ desc = dev_get_uclass_plat(dev);
+ if (!desc || desc->part_type == PART_TYPE_UNKNOWN)
+ continue;
+ devnum = desc->devnum;
+ partnum = find_boot_partition(partname, desc,
+ name);
+ if (partnum >= 0)
+ break;
+ }
+
+ if (partnum < 0) {
+ log_err("Failed to find boot partition\n");
+ return;
+ }
+
+ switch (desc->uclass_id) {
+ case UCLASS_SCSI:
+ snprintf(dfu_string, 32, "scsi %d=u-boot.bin part %d", devnum, partnum);
+ break;
+ case UCLASS_MMC:
+ snprintf(dfu_string, 32, "mmc 0=u-boot.bin part %d %d", devnum, partnum);
+ break;
+ default:
+ debug("Unsupported storage uclass: %d\n", desc->uclass_id);
+ return;
+ }
+ log_debug("boot partition is %s, DFU string: '%s'\n", name, dfu_string);
+
+ update_info.dfu_string = dfu_string;
+}
projects / u-boot.git / commitdiff