Commit d0ed062a authored by Chunfeng Yun's avatar Chunfeng Yun Committed by Greg Kroah-Hartman
Browse files

usb: mtu3: dual-role mode support 



support dual-role mode; there are two ways to switch between
host and device modes, one is by idpin, another is by debugfs
which depends on user input.

Signed-off-by: default avatarChunfeng Yun <chunfeng.yun@mediatek.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent b3f4e727

drivers/usb/mtu3/Kconfig

+14 −1
Original line number Diff line number Diff line
@@ -2,7 +2,7 @@ 


config USB_MTU3

	tristate "MediaTek USB3 Dual Role controller"

	depends on (USB || USB_GADGET) && HAS_DMA

	depends on EXTCON && (USB || USB_GADGET) && HAS_DMA

	depends on ARCH_MEDIATEK || COMPILE_TEST

	select USB_XHCI_MTK if USB_SUPPORT && USB_XHCI_HCD

	help
@@ -19,6 +19,7 @@ config USB_MTU3 
if USB_MTU3

choice

	bool "MTU3 Mode Selection"

	default USB_MTU3_DUAL_ROLE if (USB && USB_GADGET)

	default USB_MTU3_HOST if (USB && !USB_GADGET)

	default USB_MTU3_GADGET if (!USB && USB_GADGET)
@@ -36,6 +37,18 @@ config USB_MTU3_GADGET 
	  Select this when you want to use MTU3 in gadget mode only,

	  thereby the host feature will be regressed.



config USB_MTU3_DUAL_ROLE

	bool "Dual Role mode"

	depends on ((USB=y || USB=USB_MTU3) && (USB_GADGET=y || USB_GADGET=USB_MTU3))

	help

	  This is the default mode of working of MTU3 controller where

	  both host and gadget features are enabled.



endchoice



config USB_MTU3_DEBUG

	bool "Enable Debugging Messages"

	help

	  Say Y here to enable debugging messages in the MTU3 Driver.



endif

drivers/usb/mtu3/Makefile

+9 −2
Original line number Diff line number Diff line 


ccflags-$(CONFIG_USB_MTU3_DEBUG)	+= -DDEBUG



obj-$(CONFIG_USB_MTU3)	+= mtu3.o



mtu3-y	:= mtu3_plat.o



ifneq ($(filter y,$(CONFIG_USB_MTU3_HOST)),)

ifneq ($(filter y,$(CONFIG_USB_MTU3_HOST) $(CONFIG_USB_MTU3_DUAL_ROLE)),)

	mtu3-y	+= mtu3_host.o

endif



ifneq ($(filter y,$(CONFIG_USB_MTU3_GADGET)),)

ifneq ($(filter y,$(CONFIG_USB_MTU3_GADGET) $(CONFIG_USB_MTU3_DUAL_ROLE)),)

	mtu3-y	+= mtu3_core.o mtu3_gadget_ep0.o mtu3_gadget.o mtu3_qmu.o

endif



ifneq ($(CONFIG_USB_MTU3_DUAL_ROLE),)

	mtu3-y	+= mtu3_dr.o

endif

drivers/usb/mtu3/mtu3.h

+33 −1
Original line number Diff line number Diff line
@@ -21,6 +21,7 @@ 


#include <linux/device.h>

#include <linux/dmapool.h>

#include <linux/extcon.h>

#include <linux/interrupt.h>

#include <linux/list.h>

#include <linux/phy/phy.h>
@@ -172,15 +173,44 @@ struct mtu3_gpd_ring { 
	struct qmu_gpd *enqueue;

	struct qmu_gpd *dequeue;

};



/**

* @vbus: vbus 5V used by host mode

* @edev: external connector used to detect vbus and iddig changes

* @vbus_nb: notifier for vbus detection

* @vbus_nb: notifier for iddig(idpin) detection

* @extcon_reg_dwork: delay work for extcon notifier register, waiting for

*		xHCI driver initialization, it's necessary for system bootup

*		as device.

* @is_u3_drd: whether port0 supports usb3.0 dual-role device or not

* @id_*: used to maually switch between host and device modes by idpin

* @manual_drd_enabled: it's true when supports dual-role device by debugfs

*		to switch host/device modes depending on user input.

*/

struct otg_switch_mtk {

	struct regulator *vbus;

	struct extcon_dev *edev;

	struct notifier_block vbus_nb;

	struct notifier_block id_nb;

	struct delayed_work extcon_reg_dwork;

	bool is_u3_drd;

	/* dual-role switch by debugfs */

	struct pinctrl *id_pinctrl;

	struct pinctrl_state *id_float;

	struct pinctrl_state *id_ground;

	bool manual_drd_enabled;

};



/**

 * @mac_base: register base address of device MAC, exclude xHCI's

 * @ippc_base: register base address of ip port controller interface (IPPC)

 * @ippc_base: register base address of IP Power and Clock 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

 * @dbgfs_root: only used when supports manual dual-role switch via debugfs

 * @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
@@ -196,10 +226,12 @@ struct ssusb_mtk { 
	struct regulator *vusb33;

	struct clk *sys_clk;

	/* otg */

	struct otg_switch_mtk otg_switch;

	enum usb_dr_mode dr_mode;

	bool is_host;

	int u2_ports;

	int u3_ports;

	struct dentry *dbgfs_root;

	/* usb wakeup for host mode */

	bool wakeup_en;

	struct clk *wk_deb_p0;

drivers/usb/mtu3/mtu3_core.c

+5 −9
Original line number Diff line number Diff line
@@ -150,7 +150,6 @@ static void mtu3_intr_disable(struct mtu3 *mtu) 


	/* Disable level 1 interrupts */

	mtu3_writel(mbase, U3D_LV1IECR, ~0x0);



	/* Disable endpoint interrupts */

	mtu3_writel(mbase, U3D_EPIECR, ~0x0);

}
@@ -161,13 +160,10 @@ static void mtu3_intr_status_clear(struct mtu3 *mtu) 


	/* Clear EP0 and Tx/Rx EPn interrupts status */

	mtu3_writel(mbase, U3D_EPISR, ~0x0);



	/* Clear U2 USB common interrupts status */

	mtu3_writel(mbase, U3D_COMMON_USB_INTR, ~0x0);



	/* Clear U3 LTSSM interrupts status */

	mtu3_writel(mbase, U3D_LTSSM_INTR, ~0x0);



	/* Clear speed change interrupt status */

	mtu3_writel(mbase, U3D_DEV_LINK_INTR, ~0x0);

}
@@ -268,7 +264,6 @@ void mtu3_start(struct mtu3 *mtu) 


	/* Initialize the default interrupts */

	mtu3_intr_enable(mtu);



	mtu->is_active = 1;



	if (mtu->softconnect)
@@ -516,7 +511,6 @@ static int mtu3_mem_alloc(struct mtu3 *mtu) 
	mtu->out_eps = &ep_array[mtu->num_eps];

	/* ep0 uses in_eps[0], out_eps[0] is reserved */

	mtu->ep0 = mtu->in_eps;



	mtu->ep0->mtu = mtu;

	mtu->ep0->epnum = 0;
@@ -560,6 +554,7 @@ static void mtu3_set_speed(struct mtu3 *mtu) 
		/* HS/FS detected by HW */

		mtu3_setbits(mbase, U3D_POWER_MANAGEMENT, HS_ENABLE);

	}



	dev_info(mtu->dev, "max_speed: %s\n",

		usb_speed_string(mtu->max_speed));

}
@@ -586,13 +581,10 @@ static void mtu3_regs_init(struct mtu3 *mtu) 


	/* delay about 0.1us from detecting reset to send chirp-K */

	mtu3_clrbits(mbase, U3D_LINK_RESET_INFO, WTCHRP_MSK);



	/* U2/U3 detected by HW */

	mtu3_writel(mbase, U3D_DEVICE_CONF, 0);



	/* enable QMU 16B checksum */

	mtu3_setbits(mbase, U3D_QCR0, QMU_CS16B_EN);



	/* vbus detected by HW */

	mtu3_clrbits(mbase, U3D_MISC_CTRL, VBUS_FRC_EN | VBUS_ON);

}
@@ -838,6 +830,10 @@ int ssusb_gadget_init(struct ssusb_mtk *ssusb) 
		goto gadget_err;

	}



	/* init as host mode, power down device IP for power saving */

	if (mtu->ssusb->dr_mode == USB_DR_MODE_OTG)

		mtu3_stop(mtu);



	dev_dbg(dev, " %s() done...\n", __func__);



	return 0;

drivers/usb/mtu3/mtu3_dr.c

0 → 100644
+379 −0
Original line number Diff line number Diff line 
/*

 * mtu3_dr.c - dual role switch and host glue layer

 *

 * 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.

 *

 */



#include <linux/debugfs.h>

#include <linux/irq.h>

#include <linux/kernel.h>

#include <linux/of_device.h>

#include <linux/pinctrl/consumer.h>

#include <linux/seq_file.h>

#include <linux/uaccess.h>



#include "mtu3.h"

#include "mtu3_dr.h"



#define USB2_PORT 2

#define USB3_PORT 3



enum mtu3_vbus_id_state {

	MTU3_ID_FLOAT = 1,

	MTU3_ID_GROUND,

	MTU3_VBUS_OFF,

	MTU3_VBUS_VALID,

};



static void toggle_opstate(struct ssusb_mtk *ssusb)

{

	if (!ssusb->otg_switch.is_u3_drd) {

		mtu3_setbits(ssusb->mac_base, U3D_DEVICE_CONTROL, DC_SESSION);

		mtu3_setbits(ssusb->mac_base, U3D_POWER_MANAGEMENT, SOFT_CONN);

	}

}



/* only port0 supports dual-role mode */

static int ssusb_port0_switch(struct ssusb_mtk *ssusb,

	int version, bool tohost)

{

	void __iomem *ibase = ssusb->ippc_base;

	u32 value;



	dev_dbg(ssusb->dev, "%s (switch u%d port0 to %s)\n", __func__,

		version, tohost ? "host" : "device");



	if (version == USB2_PORT) {

		/* 1. power off and disable u2 port0 */

		value = mtu3_readl(ibase, SSUSB_U2_CTRL(0));

		value |= SSUSB_U2_PORT_PDN | SSUSB_U2_PORT_DIS;

		mtu3_writel(ibase, SSUSB_U2_CTRL(0), value);



		/* 2. power on, enable u2 port0 and select its mode */

		value = mtu3_readl(ibase, SSUSB_U2_CTRL(0));

		value &= ~(SSUSB_U2_PORT_PDN | SSUSB_U2_PORT_DIS);

		value = tohost ? (value | SSUSB_U2_PORT_HOST_SEL) :

			(value & (~SSUSB_U2_PORT_HOST_SEL));

		mtu3_writel(ibase, SSUSB_U2_CTRL(0), value);

	} else {

		/* 1. power off and disable u3 port0 */

		value = mtu3_readl(ibase, SSUSB_U3_CTRL(0));

		value |= SSUSB_U3_PORT_PDN | SSUSB_U3_PORT_DIS;

		mtu3_writel(ibase, SSUSB_U3_CTRL(0), value);



		/* 2. power on, enable u3 port0 and select its mode */

		value = mtu3_readl(ibase, SSUSB_U3_CTRL(0));

		value &= ~(SSUSB_U3_PORT_PDN | SSUSB_U3_PORT_DIS);

		value = tohost ? (value | SSUSB_U3_PORT_HOST_SEL) :

			(value & (~SSUSB_U3_PORT_HOST_SEL));

		mtu3_writel(ibase, SSUSB_U3_CTRL(0), value);

	}



	return 0;

}



static void switch_port_to_host(struct ssusb_mtk *ssusb)

{

	u32 check_clk = 0;



	dev_dbg(ssusb->dev, "%s\n", __func__);



	ssusb_port0_switch(ssusb, USB2_PORT, true);



	if (ssusb->otg_switch.is_u3_drd) {

		ssusb_port0_switch(ssusb, USB3_PORT, true);

		check_clk = SSUSB_U3_MAC_RST_B_STS;

	}



	ssusb_check_clocks(ssusb, check_clk);



	/* after all clocks are stable */

	toggle_opstate(ssusb);

}



static void switch_port_to_device(struct ssusb_mtk *ssusb)

{

	u32 check_clk = 0;



	dev_dbg(ssusb->dev, "%s\n", __func__);



	ssusb_port0_switch(ssusb, USB2_PORT, false);



	if (ssusb->otg_switch.is_u3_drd) {

		ssusb_port0_switch(ssusb, USB3_PORT, false);

		check_clk = SSUSB_U3_MAC_RST_B_STS;

	}



	ssusb_check_clocks(ssusb, check_clk);

}



int ssusb_set_vbus(struct otg_switch_mtk *otg_sx, int is_on)

{

	struct ssusb_mtk *ssusb =

		container_of(otg_sx, struct ssusb_mtk, otg_switch);

	struct regulator *vbus = otg_sx->vbus;

	int ret;



	/* vbus is optional */

	if (!vbus)

		return 0;



	dev_dbg(ssusb->dev, "%s: turn %s\n", __func__, is_on ? "on" : "off");



	if (is_on) {

		ret = regulator_enable(vbus);

		if (ret) {

			dev_err(ssusb->dev, "vbus regulator enable failed\n");

			return ret;

		}

	} else {

		regulator_disable(vbus);

	}



	return 0;

}



/*

 * switch to host: -> MTU3_VBUS_OFF --> MTU3_ID_GROUND

 * switch to device: -> MTU3_ID_FLOAT --> MTU3_VBUS_VALID

 */

static void ssusb_set_mailbox(struct otg_switch_mtk *otg_sx,

	enum mtu3_vbus_id_state status)

{

	struct ssusb_mtk *ssusb =

		container_of(otg_sx, struct ssusb_mtk, otg_switch);

	struct mtu3 *mtu = ssusb->u3d;



	dev_dbg(ssusb->dev, "mailbox state(%d)\n", status);



	switch (status) {

	case MTU3_ID_GROUND:

		switch_port_to_host(ssusb);

		ssusb_set_vbus(otg_sx, 1);

		ssusb->is_host = true;

		break;

	case MTU3_ID_FLOAT:

		ssusb->is_host = false;

		ssusb_set_vbus(otg_sx, 0);

		switch_port_to_device(ssusb);

		break;

	case MTU3_VBUS_OFF:

		mtu3_stop(mtu);

		pm_relax(ssusb->dev);

		break;

	case MTU3_VBUS_VALID:

		/* avoid suspend when works as device */

		pm_stay_awake(ssusb->dev);

		mtu3_start(mtu);

		break;

	default:

		dev_err(ssusb->dev, "invalid state\n");

	}

}



static int ssusb_id_notifier(struct notifier_block *nb,

	unsigned long event, void *ptr)

{

	struct otg_switch_mtk *otg_sx =

		container_of(nb, struct otg_switch_mtk, id_nb);



	if (event)

		ssusb_set_mailbox(otg_sx, MTU3_ID_GROUND);

	else

		ssusb_set_mailbox(otg_sx, MTU3_ID_FLOAT);



	return NOTIFY_DONE;

}



static int ssusb_vbus_notifier(struct notifier_block *nb,

	unsigned long event, void *ptr)

{

	struct otg_switch_mtk *otg_sx =

		container_of(nb, struct otg_switch_mtk, vbus_nb);



	if (event)

		ssusb_set_mailbox(otg_sx, MTU3_VBUS_VALID);

	else

		ssusb_set_mailbox(otg_sx, MTU3_VBUS_OFF);



	return NOTIFY_DONE;

}



static int ssusb_extcon_register(struct otg_switch_mtk *otg_sx)

{

	struct ssusb_mtk *ssusb =

		container_of(otg_sx, struct ssusb_mtk, otg_switch);

	struct extcon_dev *edev = otg_sx->edev;

	int ret;



	/* extcon is optional */

	if (!edev)

		return 0;



	otg_sx->vbus_nb.notifier_call = ssusb_vbus_notifier;

	ret = extcon_register_notifier(edev, EXTCON_USB,

					&otg_sx->vbus_nb);

	if (ret < 0)

		dev_err(ssusb->dev, "failed to register notifier for USB\n");



	otg_sx->id_nb.notifier_call = ssusb_id_notifier;

	ret = extcon_register_notifier(edev, EXTCON_USB_HOST,

					&otg_sx->id_nb);

	if (ret < 0)

		dev_err(ssusb->dev, "failed to register notifier for USB-HOST\n");



	dev_dbg(ssusb->dev, "EXTCON_USB: %d, EXTCON_USB_HOST: %d\n",

		extcon_get_cable_state_(edev, EXTCON_USB),

		extcon_get_cable_state_(edev, EXTCON_USB_HOST));



	/* default as host, switch to device mode if needed */

	if (extcon_get_cable_state_(edev, EXTCON_USB_HOST) == false)

		ssusb_set_mailbox(otg_sx, MTU3_ID_FLOAT);

	if (extcon_get_cable_state_(edev, EXTCON_USB) == true)

		ssusb_set_mailbox(otg_sx, MTU3_VBUS_VALID);



	return 0;

}



static void extcon_register_dwork(struct work_struct *work)

{

	struct delayed_work *dwork = to_delayed_work(work);

	struct otg_switch_mtk *otg_sx =

	    container_of(dwork, struct otg_switch_mtk, extcon_reg_dwork);



	ssusb_extcon_register(otg_sx);

}



/*

 * We provide an interface via debugfs to switch between host and device modes

 * depending on user input.

 * This is useful in special cases, such as uses TYPE-A receptacle but also

 * wants to support dual-role mode.

 * It generates cable state changes by pulling up/down IDPIN and

 * notifies driver to switch mode by "extcon-usb-gpio".

 * NOTE: when use MICRO receptacle, should not enable this interface.

 */

static void ssusb_mode_manual_switch(struct ssusb_mtk *ssusb, int to_host)

{

	struct otg_switch_mtk *otg_sx = &ssusb->otg_switch;



	if (to_host)

		pinctrl_select_state(otg_sx->id_pinctrl, otg_sx->id_ground);

	else

		pinctrl_select_state(otg_sx->id_pinctrl, otg_sx->id_float);

}





static int ssusb_mode_show(struct seq_file *sf, void *unused)

{

	struct ssusb_mtk *ssusb = sf->private;



	seq_printf(sf, "current mode: %s(%s drd)\n(echo device/host)\n",

		ssusb->is_host ? "host" : "device",

		ssusb->otg_switch.manual_drd_enabled ? "manual" : "auto");



	return 0;

}



static int ssusb_mode_open(struct inode *inode, struct file *file)

{

	return single_open(file, ssusb_mode_show, inode->i_private);

}



static ssize_t ssusb_mode_write(struct file *file,

	const char __user *ubuf, size_t count, loff_t *ppos)

{

	struct seq_file *sf = file->private_data;

	struct ssusb_mtk *ssusb = sf->private;

	char buf[16];



	if (copy_from_user(&buf, ubuf, min_t(size_t, sizeof(buf) - 1, count)))

		return -EFAULT;



	if (!strncmp(buf, "host", 4) && !ssusb->is_host) {

		ssusb_mode_manual_switch(ssusb, 1);

	} else if (!strncmp(buf, "device", 6) && ssusb->is_host) {

		ssusb_mode_manual_switch(ssusb, 0);

	} else {

		dev_err(ssusb->dev, "wrong or duplicated setting\n");

		return -EINVAL;

	}



	return count;

}



static const struct file_operations ssusb_mode_fops = {

	.open = ssusb_mode_open,

	.write = ssusb_mode_write,

	.read = seq_read,

	.llseek = seq_lseek,

	.release = single_release,

};



static void ssusb_debugfs_init(struct ssusb_mtk *ssusb)

{

	struct dentry *root;

	struct dentry *file;



	root = debugfs_create_dir(dev_name(ssusb->dev), usb_debug_root);

	if (IS_ERR_OR_NULL(root)) {

		if (!root)

			dev_err(ssusb->dev, "create debugfs root failed\n");

		return;

	}

	ssusb->dbgfs_root = root;



	file = debugfs_create_file("mode", S_IRUGO | S_IWUSR, root,

			ssusb, &ssusb_mode_fops);

	if (!file)

		dev_dbg(ssusb->dev, "create debugfs mode failed\n");

}



static void ssusb_debugfs_exit(struct ssusb_mtk *ssusb)

{

	debugfs_remove_recursive(ssusb->dbgfs_root);

}



int ssusb_otg_switch_init(struct ssusb_mtk *ssusb)

{

	struct otg_switch_mtk *otg_sx = &ssusb->otg_switch;



	INIT_DELAYED_WORK(&otg_sx->extcon_reg_dwork, extcon_register_dwork);



	if (otg_sx->manual_drd_enabled)

		ssusb_debugfs_init(ssusb);



	/* It is enough to delay 1s for waiting for host initialization */

	schedule_delayed_work(&otg_sx->extcon_reg_dwork, HZ);



	return 0;

}



void ssusb_otg_switch_exit(struct ssusb_mtk *ssusb)

{

	struct otg_switch_mtk *otg_sx = &ssusb->otg_switch;



	cancel_delayed_work(&otg_sx->extcon_reg_dwork);



	if (otg_sx->edev) {

		extcon_unregister_notifier(otg_sx->edev,

			EXTCON_USB, &otg_sx->vbus_nb);

		extcon_unregister_notifier(otg_sx->edev,

			EXTCON_USB_HOST, &otg_sx->id_nb);

	}



	if (otg_sx->manual_drd_enabled)

		ssusb_debugfs_exit(ssusb);

}

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