1 files changed, 120 insertions, 0 deletions
diff --git a/drivers/xen/pvblock.c b/drivers/xen/pvblock.c
new file mode 100644
index 0000000..d2b616b
--- /dev/null
+++ b/drivers/xen/pvblock.c
@@ -0,0 +1,120 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2020 EPAM Systems Inc.
+ */
+#include <blk.h>
+#include <common.h>
+#include <dm.h>
+#include <dm/device-internal.h>
+
+#define DRV_NAME	"pvblock"
+#define DRV_NAME_BLK	"pvblock_blk"
+
+struct blkfront_dev {
+	char dummy;
+};
+
+static int init_blkfront(unsigned int devid, struct blkfront_dev *dev)
+{
+	return 0;
+}
+
+static void shutdown_blkfront(struct blkfront_dev *dev)
+{
+}
+
+ulong pvblock_blk_read(struct udevice *udev, lbaint_t blknr, lbaint_t blkcnt,
+		       void *buffer)
+{
+	return 0;
+}
+
+ulong pvblock_blk_write(struct udevice *udev, lbaint_t blknr, lbaint_t blkcnt,
+			const void *buffer)
+{
+	return 0;
+}
+
+static int pvblock_blk_bind(struct udevice *udev)
+{
+	return 0;
+}
+
+static int pvblock_blk_probe(struct udevice *udev)
+{
+	struct blkfront_dev *blk_dev = dev_get_priv(udev);
+	int ret;
+
+	ret = init_blkfront(0, blk_dev);
+	if (ret < 0)
+		return ret;
+	return 0;
+}
+
+static int pvblock_blk_remove(struct udevice *udev)
+{
+	struct blkfront_dev *blk_dev = dev_get_priv(udev);
+
+	shutdown_blkfront(blk_dev);
+	return 0;
+}
+
+static const struct blk_ops pvblock_blk_ops = {
+	.read	= pvblock_blk_read,
+	.write	= pvblock_blk_write,
+};
+
+U_BOOT_DRIVER(pvblock_blk) = {
+	.name			= DRV_NAME_BLK,
+	.id			= UCLASS_BLK,
+	.ops			= &pvblock_blk_ops,
+	.bind			= pvblock_blk_bind,
+	.probe			= pvblock_blk_probe,
+	.remove			= pvblock_blk_remove,
+	.priv_auto_alloc_size	= sizeof(struct blkfront_dev),
+	.flags			= DM_FLAG_OS_PREPARE,
+};
+
+/*******************************************************************************
+ * Para-virtual block device class
+ *******************************************************************************/
+
+void pvblock_init(void)
+{
+	struct driver_info info;
+	struct udevice *udev;
+	struct uclass *uc;
+	int ret;
+
+	/*
+	 * At this point Xen drivers have already initialized,
+	 * so we can instantiate the class driver and enumerate
+	 * virtual block devices.
+	 */
+	info.name = DRV_NAME;
+	ret = device_bind_by_name(gd->dm_root, false, &info, &udev);
+	if (ret < 0)
+		printf("Failed to bind " DRV_NAME ", ret: %d\n", ret);
+
+	/* Bootstrap virtual block devices class driver */
+	ret = uclass_get(UCLASS_PVBLOCK, &uc);
+	if (ret)
+		return;
+	uclass_foreach_dev_probe(UCLASS_PVBLOCK, udev);
+}
+
+static int pvblock_probe(struct udevice *udev)
+{
+	return 0;
+}
+
+U_BOOT_DRIVER(pvblock_drv) = {
+	.name		= DRV_NAME,
+	.id		= UCLASS_PVBLOCK,
+	.probe		= pvblock_probe,
+};
+
+UCLASS_DRIVER(pvblock) = {
+	.name		= DRV_NAME,
+	.id		= UCLASS_PVBLOCK,
+};