usb: Add Cadence USB3 host and gadget driver

Add support for USB3 host and gadget driver. This is a direct sync of
Linux kernel Cadence USB stack that from v5.4-rc1 release.
Driver has been modified so that it compiles without errors against
U-Boot code base.
Features not required for U-Boot such as scatter-gather DMA and OTG
interrupt handling has been dropped.

Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
[jjhiblot@ti.com: Add PHY support]
Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>

1 files changed, 55 insertions, 0 deletions

diff --git a/drivers/usb/cdns3/host.c b/drivers/usb/cdns3/host.c
new file mode 100644
index 0000000000..79be63001d
--- /dev/null
+++ b/drivers/usb/cdns3/host.c
@@ -0,0 +1,55 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Cadence USBSS DRD Driver - host side
+ *
+ * Copyright (C) 2018-2019 Cadence Design Systems.
+ * Copyright (C) 2017-2018 NXP
+ *
+ * Authors: Peter Chen <peter.chen@nxp.com>
+ *          Pawel Laszczak <pawell@cadence.com>
+ */
+#include <dm.h>
+#include <linux/compat.h>
+#include <usb.h>
+#include "../host/xhci.h"
+
+#include "core.h"
+#include "drd.h"
+
+static int __cdns3_host_init(struct cdns3 *cdns)
+{
+	struct xhci_hcor *hcor;
+	struct xhci_hccr *hccr;
+
+	cdns3_drd_switch_host(cdns, 1);
+
+	hccr = (struct xhci_hccr *)cdns->xhci_regs;
+	hcor = (struct xhci_hcor *)(cdns->xhci_regs +
+			HC_LENGTH(xhci_readl(&(hccr)->cr_capbase)));
+
+	return xhci_register(cdns->dev, hccr, hcor);
+}
+
+static void cdns3_host_exit(struct cdns3 *cdns)
+{
+	xhci_deregister(cdns->dev);
+	cdns3_drd_switch_host(cdns, 0);
+}
+
+int cdns3_host_init(struct cdns3 *cdns)
+{
+	struct cdns3_role_driver *rdrv;
+
+	rdrv = devm_kzalloc(cdns->dev, sizeof(*rdrv), GFP_KERNEL);
+	if (!rdrv)
+		return -ENOMEM;
+
+	rdrv->start	= __cdns3_host_init;
+	rdrv->stop	= cdns3_host_exit;
+	rdrv->state	= CDNS3_ROLE_STATE_INACTIVE;
+	rdrv->name	= "host";
+
+	cdns->roles[USB_ROLE_HOST] = rdrv;
+
+	return 0;
+}