[PATCH v4 30/33] bootstd: usb: Add a bootdev driver

Simon Glass
2022-03-06T12:54:33Z

Add a bootdev driver for USB host. It can use the distro boot mechanism to
locate a file, or any other available bootmeth.

Signed-off-by: Simon Glass <sjg@chromium.org>
---

(no changes since v1)

common/usb_storage.c | 12 +++++++
drivers/usb/host/Makefile | 4 +++
drivers/usb/host/usb_bootdev.c | 61 ++++++++++++++++++++++++++++++++++
3 files changed, 77 insertions(+)
create mode 100644 drivers/usb/host/usb_bootdev.c

diff --git a/common/usb_storage.c b/common/usb_storage.c
index c9e2d7343c..24ccb21701 100644
--- a/common/usb_storage.c
+++ b/common/usb_storage.c
@@ -34,6 +34,7 @@

#include <common.h>
#include <blk.h>
+#include <bootdev.h>
#include <command.h>
#include <dm.h>
#include <errno.h>
@@ -239,6 +240,17 @@ static int usb_stor_probe_device(struct usb_device *udev)
if (ret)
return ret;
}
+
+ ret = bootdev_setup_sibling_blk(dev, "usb_bootdev");
+ if (ret) {
+ int ret2;
+
+ ret2 = device_unbind(dev);
+ if (ret2)
+ return log_msg_ret("bootdev", ret2);
+ return log_msg_ret("bootdev", ret);
+ }
+
}
#else
/* We don't have space to even probe if we hit the maximum */
diff --git a/drivers/usb/host/Makefile b/drivers/usb/host/Makefile
index eb6fe9f6b3..742957d199 100644
--- a/drivers/usb/host/Makefile
+++ b/drivers/usb/host/Makefile
@@ -8,6 +8,10 @@ obj-y += usb-uclass.o
obj-$(CONFIG_SANDBOX) += usb-sandbox.o
endif

+ifdef CONFIG_$(SPL_TPL_)USB_STORAGE
+obj-$(CONFIG_$(SPL_TPL_)BOOTSTD) += usb_bootdev.o
+endif
+
# ohci
obj-$(CONFIG_USB_OHCI_NEW) += ohci-hcd.o
obj-$(CONFIG_USB_ATMEL) += ohci-at91.o
diff --git a/drivers/usb/host/usb_bootdev.c b/drivers/usb/host/usb_bootdev.c
new file mode 100644
index 0000000000..b85f699933
--- /dev/null
+++ b/drivers/usb/host/usb_bootdev.c
@@ -0,0 +1,61 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Bootdevice for USB
+ *
+ * Copyright 2021 Google LLC
+ * Written by Simon Glass <sjg@chromium.org>
+ */
+
+#include <common.h>
+#include <bootdev.h>
+#include <dm.h>
+#include <usb.h>
+
+static int usb_get_bootflow(struct udevice *dev, struct bootflow_iter *iter,
+ struct bootflow *bflow)
+{
+ struct udevice *blk;
+ int ret;
+
+ ret = bootdev_get_sibling_blk(dev, &blk);
+ /*
+ * If there is no media, indicate that no more partitions should be
+ * checked
+ */
+ if (ret == -EOPNOTSUPP)
+ ret = -ESHUTDOWN;
+ if (ret)
+ return log_msg_ret("blk", ret);
+ assert(blk);
+ ret = bootdev_find_in_blk(dev, blk, iter, bflow);
+ if (ret)
+ return log_msg_ret("find", ret);
+
+ return 0;
+}
+
+static int usb_bootdev_bind(struct udevice *dev)
+{
+ struct bootdev_uc_plat *ucp = dev_get_uclass_plat(dev);
+
+ ucp->prio = BOOTDEVP_3_SCAN_SLOW;
+
+ return 0;
+}
+
+struct bootdev_ops usb_bootdev_ops = {
+ .get_bootflow = usb_get_bootflow,
+};
+
+static const struct udevice_id usb_bootdev_ids[] = {
+ { .compatible = "u-boot,bootdev-usb" },
+ { }
+};
+
+U_BOOT_DRIVER(usb_bootdev) = {
+ .name = "usb_bootdev",
+ .id = UCLASS_BOOTDEV,
+ .ops = &usb_bootdev_ops,
+ .bind = usb_bootdev_bind,
+ .of_match = usb_bootdev_ids,
+};
--
2.35.1.616.g0bdcbb4464-goog