From 7d0478d241703b50e88736f3774deb5472418b58 Mon Sep 17 00:00:00 2001
From: Simon Glass <sjg@chromium.org>
Date: Sun, 24 Apr 2022 23:31:21 -0600
Subject: [PATCH] bootstd: sandbox: Add a hostfs bootdev

It is helpful to be able to try out bootstd on sandbox, using host files.
This is easier than using a block device, which must have a filesystem,
partition table, etc.

Add a new driver which provides this feature. For now it is not used in
tests, but it is likely to be useful.

Add notes in the devicetree also, but don't disturb the tests.

Signed-off-by: Simon Glass <sjg@chromium.org>
---
 arch/sandbox/dts/sandbox.dts  |  4 +++
 arch/sandbox/dts/sandbox.dtsi |  5 ++++
 fs/Kconfig                    |  2 ++
 fs/sandbox/Kconfig            |  2 ++
 fs/sandbox/Makefile           |  1 +
 fs/sandbox/host_bootdev.c     | 56 +++++++++++++++++++++++++++++++++++
 6 files changed, 70 insertions(+)
 create mode 100644 fs/sandbox/Kconfig
 create mode 100644 fs/sandbox/host_bootdev.c

diff --git a/arch/sandbox/dts/sandbox.dts b/arch/sandbox/dts/sandbox.dts
index 127f168f02..18fde1c8c6 100644
--- a/arch/sandbox/dts/sandbox.dts
+++ b/arch/sandbox/dts/sandbox.dts
@@ -66,6 +66,10 @@
 		fake-host-hwaddr = [00 00 66 44 22 00];
 	};
 
+	host-fs {
+		compatible = "sandbox,bootdev-host";
+	};
+
 	i2c_0: i2c@0 {
 		#address-cells = <1>;
 		#size-cells = <0>;
diff --git a/arch/sandbox/dts/sandbox.dtsi b/arch/sandbox/dts/sandbox.dtsi
index 826db26fc2..29306ac04d 100644
--- a/arch/sandbox/dts/sandbox.dtsi
+++ b/arch/sandbox/dts/sandbox.dtsi
@@ -19,6 +19,11 @@
 		#sound-dai-cells = <1>;
 	};
 
+	bootstd {
+		compatible = "u-boot,boot-std";
+		filename-prefixes = "./";
+	};
+
 	buttons {
 		compatible = "gpio-keys";
 
diff --git a/fs/Kconfig b/fs/Kconfig
index cda9f66cc9..aa13d4faa7 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -16,6 +16,8 @@ source "fs/fat/Kconfig"
 
 source "fs/jffs2/Kconfig"
 
+source "fs/sandbox/Kconfig"
+
 source "fs/ubifs/Kconfig"
 
 source "fs/cramfs/Kconfig"
diff --git a/fs/sandbox/Kconfig b/fs/sandbox/Kconfig
new file mode 100644
index 0000000000..b2af848242
--- /dev/null
+++ b/fs/sandbox/Kconfig
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0+
+#
diff --git a/fs/sandbox/Makefile b/fs/sandbox/Makefile
index 06090519bf..880d59dd69 100644
--- a/fs/sandbox/Makefile
+++ b/fs/sandbox/Makefile
@@ -9,3 +9,4 @@
 # Pavel Bartusek, Sysgo Real-Time Solutions AG, pba@sysgo.de
 
 obj-y := sandboxfs.o
+obj-$(CONFIG_$(SPL_TPL_)BOOTSTD) += host_bootdev.o
diff --git a/fs/sandbox/host_bootdev.c b/fs/sandbox/host_bootdev.c
new file mode 100644
index 0000000000..0d12ee4ef7
--- /dev/null
+++ b/fs/sandbox/host_bootdev.c
@@ -0,0 +1,56 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Bootdevice for MMC
+ *
+ * Copyright 2021 Google LLC
+ * Written by Simon Glass <sjg@chromium.org>
+ */
+
+#include <common.h>
+#include <bootdev.h>
+#include <bootflow.h>
+#include <bootmeth.h>
+#include <dm.h>
+#include <fs.h>
+
+static int host_get_bootflow(struct udevice *dev, struct bootflow_iter *iter,
+			     struct bootflow *bflow)
+{
+	int ret;
+
+	if (iter->part)
+		return log_msg_ret("max", -ESHUTDOWN);
+
+	bflow->name = strdup(dev->name);
+	if (!bflow->name)
+		return log_msg_ret("name", -ENOMEM);
+
+	ret = bootmeth_check(bflow->method, iter);
+	if (ret)
+		return log_msg_ret("check", ret);
+
+	bflow->state = BOOTFLOWST_MEDIA;
+	bflow->fs_type = FS_TYPE_SANDBOX;
+
+	ret = bootmeth_read_bootflow(bflow->method, bflow);
+	if (ret)
+		return log_msg_ret("method", ret);
+
+	return 0;
+}
+
+struct bootdev_ops host_bootdev_ops = {
+	.get_bootflow	= host_get_bootflow,
+};
+
+static const struct udevice_id host_bootdev_ids[] = {
+	{ .compatible = "sandbox,bootdev-host" },
+	{ }
+};
+
+U_BOOT_DRIVER(host_bootdev) = {
+	.name		= "host_bootdev",
+	.id		= UCLASS_BOOTDEV,
+	.ops		= &host_bootdev_ops,
+	.of_match	= host_bootdev_ids,
+};