usb: mtu3: host only mode support

supports host only mode and the code is ported from
host/xhci-mtk.c
IPPC register shared between host and device is moved
into common glue layer.

Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/mtu3/Kconfig

@@ -4,6 +4,7 @@ config USB_MTU3
 	tristate "MediaTek USB3 Dual Role controller"
 	depends on (USB || USB_GADGET) && HAS_DMA
 	depends on ARCH_MEDIATEK || COMPILE_TEST
+	select USB_XHCI_MTK if USB_SUPPORT && USB_XHCI_HCD
 	help
 	  Say Y or M here if your system runs on MediaTek SoCs with
 	  Dual Role SuperSpeed USB controller. You can select usb
@@ -18,8 +19,16 @@ config USB_MTU3
 if USB_MTU3
 choice
 	bool "MTU3 Mode Selection"
+	default USB_MTU3_HOST if (USB && !USB_GADGET)
 	default USB_MTU3_GADGET if (!USB && USB_GADGET)
 
+config USB_MTU3_HOST
+	bool "Host only mode"
+	depends on USB=y || USB=USB_MTU3
+	help
+	  Select this when you want to use MTU3 in host mode only,
+	  thereby the gadget feature will be regressed.
+
 config USB_MTU3_GADGET
 	bool "Gadget only mode"
 	depends on USB_GADGET=y || USB_GADGET=USB_MTU3

drivers/usb/mtu3/Makefile

@@ -1,2 +1,11 @@
 obj-$(CONFIG_USB_MTU3)	+= mtu3.o
-mtu3-y	:= mtu3_plat.o mtu3_core.o mtu3_gadget_ep0.o mtu3_gadget.o mtu3_qmu.o
+
+mtu3-y	:= mtu3_plat.o
+
+ifneq ($(filter y,$(CONFIG_USB_MTU3_HOST)),)
+	mtu3-y	+= mtu3_host.o
+endif
+
+ifneq ($(filter y,$(CONFIG_USB_MTU3_GADGET)),)
+	mtu3-y	+= mtu3_core.o mtu3_gadget_ep0.o mtu3_gadget.o mtu3_qmu.o
+endif

drivers/usb/mtu3/mtu3.h

@@ -172,6 +172,40 @@ struct mtu3_gpd_ring {
 	struct qmu_gpd *enqueue;
 	struct qmu_gpd *dequeue;
 };
+/**
+ * @mac_base: register base address of device MAC, exclude xHCI's
+ * @ippc_base: register base address of ip port controller interface (IPPC)
+ * @vusb33: usb3.3V shared by device/host IP
+ * @sys_clk: system clock of mtu3, shared by device/host IP
+ * @dr_mode: works in which mode:
+ *		host only, device only or dual-role mode
+ * @u2_ports: number of usb2.0 host ports
+ * @u3_ports: number of usb3.0 host ports
+ * @wakeup_en: it's true when supports remote wakeup in host mode
+ * @wk_deb_p0: port0's wakeup debounce clock
+ * @wk_deb_p1: it's optional, and depends on port1 is supported or not
+ */
+struct ssusb_mtk {
+	struct device *dev;
+	struct mtu3 *u3d;
+	void __iomem *mac_base;
+	void __iomem *ippc_base;
+	struct phy **phys;
+	int num_phys;
+	/* common power & clock */
+	struct regulator *vusb33;
+	struct clk *sys_clk;
+	/* otg */
+	enum usb_dr_mode dr_mode;
+	bool is_host;
+	int u2_ports;
+	int u3_ports;
+	/* usb wakeup for host mode */
+	bool wakeup_en;
+	struct clk *wk_deb_p0;
+	struct clk *wk_deb_p1;
+	struct regmap *pericfg;
+};
 
 /**
  * @fifo_size: it is (@slot + 1) * @fifo_seg_size
@@ -210,6 +244,11 @@ struct mtu3_request {
 	int epnum;
 };
 
+static inline struct ssusb_mtk *dev_to_ssusb(struct device *dev)
+{
+	return dev_get_drvdata(dev);
+}
+
 /**
  * struct mtu3 - device driver instance data.
  * @slot: MTU3_U2_IP_SLOT_DEFAULT for U2 IP only,
@@ -222,12 +261,10 @@ struct mtu3_request {
  */
 struct mtu3 {
 	spinlock_t lock;
+	struct ssusb_mtk *ssusb;
 	struct device *dev;
 	void __iomem *mac_base;
 	void __iomem *ippc_base;
-	struct phy *phy;
-	struct regulator *vusb33;
-	struct clk *sys_clk;
 	int irq;
 
 	struct mtu3_fifo_info tx_fifo;
@@ -320,7 +357,7 @@ static inline void mtu3_clrbits(void __iomem *base, u32 offset, u32 bits)
 	writel((tmp & ~(bits)), addr);
 }
 
-int ssusb_check_clocks(struct mtu3 *mtu, u32 ex_clks);
+int ssusb_check_clocks(struct ssusb_mtk *ssusb, u32 ex_clks);
 struct usb_request *mtu3_alloc_request(struct usb_ep *ep, gfp_t gfp_flags);
 void mtu3_free_request(struct usb_ep *ep, struct usb_request *req);
 void mtu3_req_complete(struct mtu3_ep *mep,
@@ -341,8 +378,6 @@ void mtu3_gadget_reset(struct mtu3 *mtu);
 void mtu3_gadget_suspend(struct mtu3 *mtu);
 void mtu3_gadget_resume(struct mtu3 *mtu);
 void mtu3_gadget_disconnect(struct mtu3 *mtu);
-int ssusb_gadget_init(struct mtu3 *mtu);
-void ssusb_gadget_exit(struct mtu3 *mtu);
 
 irqreturn_t mtu3_ep0_isr(struct mtu3 *mtu);
 extern const struct usb_ep_ops mtu3_ep0_ops;

drivers/usb/mtu3/mtu3_core.c

@@ -116,7 +116,7 @@ static int mtu3_device_enable(struct mtu3 *mtu)
 		SSUSB_U2_PORT_HOST_SEL));
 	mtu3_setbits(ibase, SSUSB_U2_CTRL(0), SSUSB_U2_PORT_OTG_SEL);
 
-	return ssusb_check_clocks(mtu, check_clk);
+	return ssusb_check_clocks(mtu->ssusb, check_clk);
 }
 
 static void mtu3_device_disable(struct mtu3 *mtu)
@@ -765,11 +765,38 @@ static void mtu3_hw_exit(struct mtu3 *mtu)
 
 /*-------------------------------------------------------------------------*/
 
-int ssusb_gadget_init(struct mtu3 *mtu)
+int ssusb_gadget_init(struct ssusb_mtk *ssusb)
 {
-	struct device *dev = mtu->dev;
-	int ret;
+	struct device *dev = ssusb->dev;
+	struct platform_device *pdev = to_platform_device(dev);
+	struct mtu3 *mtu = NULL;
+	struct resource *res;
+	int ret = -ENOMEM;
+
+	mtu = devm_kzalloc(dev, sizeof(struct mtu3), GFP_KERNEL);
+	if (mtu == NULL)
+		return -ENOMEM;
+
+	mtu->irq = platform_get_irq(pdev, 0);
+	if (mtu->irq <= 0) {
+		dev_err(dev, "fail to get irq number\n");
+		return -ENODEV;
+	}
+	dev_info(dev, "irq %d\n", mtu->irq);
 
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mac");
+	mtu->mac_base = devm_ioremap_resource(dev, res);
+	if (IS_ERR(mtu->mac_base)) {
+		dev_err(dev, "error mapping memory for dev mac\n");
+		return PTR_ERR(mtu->mac_base);
+	}
+
+	spin_lock_init(&mtu->lock);
+	mtu->dev = dev;
+	mtu->ippc_base = ssusb->ippc_base;
+	ssusb->mac_base	= mtu->mac_base;
+	ssusb->u3d = mtu;
+	mtu->ssusb = ssusb;
 	mtu->max_speed = usb_get_maximum_speed(dev);
 
 	/* check the max_speed parameter */
@@ -820,14 +847,17 @@ int ssusb_gadget_init(struct mtu3 *mtu)
 
 irq_err:
 	mtu3_hw_exit(mtu);
+	ssusb->u3d = NULL;
 	dev_err(dev, " %s() fail...\n", __func__);
 
 	return ret;
 }
 
-void ssusb_gadget_exit(struct mtu3 *mtu)
+void ssusb_gadget_exit(struct ssusb_mtk *ssusb)
 {
+	struct mtu3 *mtu = ssusb->u3d;
+
 	mtu3_gadget_cleanup(mtu);
-	device_init_wakeup(mtu->dev, false);
+	device_init_wakeup(ssusb->dev, false);
 	mtu3_hw_exit(mtu);
 }

drivers/usb/mtu3/mtu3_dr.h

@@ -0,0 +1,85 @@
+/*
+ * mtu3_dr.h - dual role switch and host glue layer header
+ *
+ * Copyright (C) 2016 MediaTek Inc.
+ *
+ * Author: Chunfeng Yun <chunfeng.yun@mediatek.com>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#ifndef _MTU3_DR_H_
+#define _MTU3_DR_H_
+
+#if IS_ENABLED(CONFIG_USB_MTU3_HOST)
+
+int ssusb_host_init(struct ssusb_mtk *ssusb, struct device_node *parent_dn);
+void ssusb_host_exit(struct ssusb_mtk *ssusb);
+int ssusb_wakeup_of_property_parse(struct ssusb_mtk *ssusb,
+				struct device_node *dn);
+int ssusb_host_enable(struct ssusb_mtk *ssusb);
+int ssusb_host_disable(struct ssusb_mtk *ssusb, bool suspend);
+int ssusb_wakeup_enable(struct ssusb_mtk *ssusb);
+void ssusb_wakeup_disable(struct ssusb_mtk *ssusb);
+
+#else
+
+static inline int ssusb_host_init(struct ssusb_mtk *ssusb,
+
+	struct device_node *parent_dn)
+{
+	return 0;
+}
+
+static inline void ssusb_host_exit(struct ssusb_mtk *ssusb)
+{}
+
+static inline int ssusb_wakeup_of_property_parse(
+	struct ssusb_mtk *ssusb, struct device_node *dn)
+{
+	return 0;
+}
+
+static inline int ssusb_host_enable(struct ssusb_mtk *ssusb)
+{
+	return 0;
+}
+
+static inline int ssusb_host_disable(struct ssusb_mtk *ssusb, bool suspend)
+{
+	return 0;
+}
+
+static inline int ssusb_wakeup_enable(struct ssusb_mtk *ssusb)
+{
+	return 0;
+}
+
+static inline void ssusb_wakeup_disable(struct ssusb_mtk *ssusb)
+{}
+
+#endif
+
+
+#if IS_ENABLED(CONFIG_USB_MTU3_GADGET)
+int ssusb_gadget_init(struct ssusb_mtk *ssusb);
+void ssusb_gadget_exit(struct ssusb_mtk *ssusb);
+#else
+static inline int ssusb_gadget_init(struct ssusb_mtk *ssusb)
+{
+	return 0;
+}
+
+static inline void ssusb_gadget_exit(struct ssusb_mtk *ssusb)
+{}
+#endif
+
+#endif		/* _MTU3_DR_H_ */