usb: mtu3: add feature to disable device's usb3 port

We may want to disable device's usb3 port when the combo phy is switched
from usb3 mode to pcie mode for some projects.
Meanwhile rename member @is_u3_ip to @u3_capable to avoid misleading, due
to the member's value may be changed when disable usb3 port, but the
controller is still a usb3 IP which also tells us how to manage the fifo.
Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Link: https://lore.kernel.org/r/20220708071903.25752-3-chunfeng.yun@mediatek.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/mtu3/mtu3.h

@@ -317,6 +317,7 @@ static inline struct ssusb_mtk *dev_to_ssusb(struct device *dev)
  * @ep0_req: dummy request used while handling standard USB requests
  *		for GET_STATUS and SET_SEL
  * @setup_buf: ep0 response buffer for GET_STATUS and SET_SEL requests
+ * @u3_capable: is capable of supporting USB3
  */
 struct mtu3 {
 	spinlock_t lock;
@@ -353,11 +354,12 @@ struct mtu3 {
 	unsigned softconnect:1;
 	unsigned u1_enable:1;
 	unsigned u2_enable:1;
-	unsigned is_u3_ip:1;
+	unsigned u3_capable:1;
 	unsigned delayed_status:1;
 	unsigned gen2cp:1;
 	unsigned connected:1;
 	unsigned async_callbacks:1;
+	unsigned separate_fifo:1;
 
 	u8 address;
 	u8 test_mode_nr;

drivers/usb/mtu3/mtu3_core.c

@@ -100,7 +100,7 @@ static int mtu3_device_enable(struct mtu3 *mtu)
 
 	mtu3_clrbits(ibase, U3D_SSUSB_IP_PW_CTRL2, SSUSB_IP_DEV_PDN);
 
-	if (mtu->is_u3_ip) {
+	if (mtu->u3_capable) {
 		check_clk = SSUSB_U3_MAC_RST_B_STS;
 		mtu3_clrbits(ibase, SSUSB_U3_CTRL(0),
 			(SSUSB_U3_PORT_DIS | SSUSB_U3_PORT_PDN |
@@ -112,7 +112,7 @@ static int mtu3_device_enable(struct mtu3 *mtu)
 
 	if (mtu->ssusb->dr_mode == USB_DR_MODE_OTG) {
 		mtu3_setbits(ibase, SSUSB_U2_CTRL(0), SSUSB_U2_PORT_OTG_SEL);
-		if (mtu->is_u3_ip)
+		if (mtu->u3_capable)
 			mtu3_setbits(ibase, SSUSB_U3_CTRL(0),
 				     SSUSB_U3_PORT_DUAL_MODE);
 	}
@@ -124,7 +124,7 @@ static void mtu3_device_disable(struct mtu3 *mtu)
 {
 	void __iomem *ibase = mtu->ippc_base;
 
-	if (mtu->is_u3_ip)
+	if (mtu->u3_capable)
 		mtu3_setbits(ibase, SSUSB_U3_CTRL(0),
 			(SSUSB_U3_PORT_DIS | SSUSB_U3_PORT_PDN));
 
@@ -133,7 +133,7 @@ static void mtu3_device_disable(struct mtu3 *mtu)
 
 	if (mtu->ssusb->dr_mode == USB_DR_MODE_OTG) {
 		mtu3_clrbits(ibase, SSUSB_U2_CTRL(0), SSUSB_U2_PORT_OTG_SEL);
-		if (mtu->is_u3_ip)
+		if (mtu->u3_capable)
 			mtu3_clrbits(ibase, SSUSB_U3_CTRL(0),
 				     SSUSB_U3_PORT_DUAL_MODE);
 	}
@@ -146,7 +146,7 @@ static void mtu3_dev_power_on(struct mtu3 *mtu)
 	void __iomem *ibase = mtu->ippc_base;
 
 	mtu3_clrbits(ibase, U3D_SSUSB_IP_PW_CTRL2, SSUSB_IP_DEV_PDN);
-	if (mtu->is_u3_ip)
+	if (mtu->u3_capable)
 		mtu3_clrbits(ibase, SSUSB_U3_CTRL(0), SSUSB_U3_PORT_PDN);
 
 	mtu3_clrbits(ibase, SSUSB_U2_CTRL(0), SSUSB_U2_PORT_PDN);
@@ -156,7 +156,7 @@ static void mtu3_dev_power_down(struct mtu3 *mtu)
 {
 	void __iomem *ibase = mtu->ippc_base;
 
-	if (mtu->is_u3_ip)
+	if (mtu->u3_capable)
 		mtu3_setbits(ibase, SSUSB_U3_CTRL(0), SSUSB_U3_PORT_PDN);
 
 	mtu3_setbits(ibase, SSUSB_U2_CTRL(0), SSUSB_U2_PORT_PDN);
@@ -213,7 +213,7 @@ static void mtu3_intr_enable(struct mtu3 *mtu)
 	value = SUSPEND_INTR | RESUME_INTR | RESET_INTR;
 	mtu3_writel(mbase, U3D_COMMON_USB_INTR_ENABLE, value);
 
-	if (mtu->is_u3_ip) {
+	if (mtu->u3_capable) {
 		/* Enable U3 LTSSM interrupts */
 		value = HOT_RST_INTR | WARM_RST_INTR |
 			ENTER_U3_INTR | EXIT_U3_INTR;
@@ -273,7 +273,7 @@ static void mtu3_csr_init(struct mtu3 *mtu)
 {
 	void __iomem *mbase = mtu->mac_base;
 
-	if (mtu->is_u3_ip) {
+	if (mtu->u3_capable) {
 		/* disable LGO_U1/U2 by default */
 		mtu3_clrbits(mbase, U3D_LINK_POWER_CONTROL,
 				SW_U1_REQUEST_ENABLE | SW_U2_REQUEST_ENABLE);
@@ -341,7 +341,7 @@ void mtu3_ep_stall_set(struct mtu3_ep *mep, bool set)
 
 void mtu3_dev_on_off(struct mtu3 *mtu, int is_on)
 {
-	if (mtu->is_u3_ip && mtu->speed >= USB_SPEED_SUPER)
+	if (mtu->u3_capable && mtu->speed >= USB_SPEED_SUPER)
 		mtu3_ss_func_set(mtu, is_on);
 	else
 		mtu3_hs_softconn_set(mtu, is_on);
@@ -544,7 +544,7 @@ static void get_ep_fifo_config(struct mtu3 *mtu)
 	struct mtu3_fifo_info *rx_fifo;
 	u32 fifosize;
 
-	if (mtu->is_u3_ip) {
+	if (mtu->separate_fifo) {
 		fifosize = mtu3_readl(mtu->mac_base, U3D_CAP_EPNTXFFSZ);
 		tx_fifo = &mtu->tx_fifo;
 		tx_fifo->base = 0;
@@ -821,6 +821,10 @@ static irqreturn_t mtu3_irq(int irq, void *data)
 
 static void mtu3_check_params(struct mtu3 *mtu)
 {
+	/* device's u3 port (port0) is disabled */
+	if (mtu->u3_capable && (mtu->ssusb->u3p_dis_msk & BIT(0)))
+		mtu->u3_capable = 0;
+
 	/* check the max_speed parameter */
 	switch (mtu->max_speed) {
 	case USB_SPEED_FULL:
@@ -838,7 +842,7 @@ static void mtu3_check_params(struct mtu3 *mtu)
 		break;
 	}
 
-	if (!mtu->is_u3_ip && (mtu->max_speed > USB_SPEED_HIGH))
+	if (!mtu->u3_capable && (mtu->max_speed > USB_SPEED_HIGH))
 		mtu->max_speed = USB_SPEED_HIGH;
 
 	mtu->speed = mtu->max_speed;
@@ -857,10 +861,12 @@ static int mtu3_hw_init(struct mtu3 *mtu)
 	mtu->gen2cp = !!(mtu->hw_version >= MTU3_TRUNK_VERS_1003);
 
 	value = mtu3_readl(mtu->ippc_base, U3D_SSUSB_IP_DEV_CAP);
-	mtu->is_u3_ip = !!SSUSB_IP_DEV_U3_PORT_NUM(value);
+	mtu->u3_capable = !!SSUSB_IP_DEV_U3_PORT_NUM(value);
+	/* usb3 ip uses separate fifo */
+	mtu->separate_fifo = mtu->u3_capable;
 
 	dev_info(mtu->dev, "IP version 0x%x(%s IP)\n", mtu->hw_version,
-		mtu->is_u3_ip ? "U3" : "U2");
+		mtu->u3_capable ? "U3" : "U2");
 
 	mtu3_check_params(mtu);
 

drivers/usb/mtu3/mtu3_plat.c

@@ -244,6 +244,8 @@ static int get_ssusb_rscs(struct platform_device *pdev, struct ssusb_mtk *ssusb)
 	if (ssusb->dr_mode == USB_DR_MODE_UNKNOWN)
 		ssusb->dr_mode = USB_DR_MODE_OTG;
 
+	of_property_read_u32(node, "mediatek,u3p-dis-msk", &ssusb->u3p_dis_msk);
+
 	if (ssusb->dr_mode == USB_DR_MODE_PERIPHERAL)
 		goto out;
 
@@ -255,8 +257,6 @@ static int get_ssusb_rscs(struct platform_device *pdev, struct ssusb_mtk *ssusb)
 	}
 
 	/* optional property, ignore the error if it does not exist */
-	of_property_read_u32(node, "mediatek,u3p-dis-msk",
-			     &ssusb->u3p_dis_msk);
 	of_property_read_u32(node, "mediatek,u2p-dis-msk",
 			     &ssusb->u2p_dis_msk);