v4.19.13 snapshot.
diff --git a/drivers/usb/mtu3/mtu3_dr.c b/drivers/usb/mtu3/mtu3_dr.c
new file mode 100644
index 0000000..ac60e9c
--- /dev/null
+++ b/drivers/usb/mtu3/mtu3_dr.c
@@ -0,0 +1,439 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * mtu3_dr.c - dual role switch and host glue layer
+ *
+ * Copyright (C) 2016 MediaTek Inc.
+ *
+ * Author: Chunfeng Yun <chunfeng.yun@mediatek.com>
+ */
+
+#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 void ssusb_id_work(struct work_struct *work)
+{
+ struct otg_switch_mtk *otg_sx =
+ container_of(work, struct otg_switch_mtk, id_work);
+
+ if (otg_sx->id_event)
+ ssusb_set_mailbox(otg_sx, MTU3_ID_GROUND);
+ else
+ ssusb_set_mailbox(otg_sx, MTU3_ID_FLOAT);
+}
+
+static void ssusb_vbus_work(struct work_struct *work)
+{
+ struct otg_switch_mtk *otg_sx =
+ container_of(work, struct otg_switch_mtk, vbus_work);
+
+ if (otg_sx->vbus_event)
+ ssusb_set_mailbox(otg_sx, MTU3_VBUS_VALID);
+ else
+ ssusb_set_mailbox(otg_sx, MTU3_VBUS_OFF);
+}
+
+/*
+ * @ssusb_id_notifier is called in atomic context, but @ssusb_set_mailbox
+ * may sleep, so use work queue here
+ */
+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);
+
+ otg_sx->id_event = event;
+ schedule_work(&otg_sx->id_work);
+
+ 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);
+
+ otg_sx->vbus_event = event;
+ schedule_work(&otg_sx->vbus_work);
+
+ 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 = devm_extcon_register_notifier(ssusb->dev, 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 = devm_extcon_register_notifier(ssusb->dev, 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_state(edev, EXTCON_USB),
+ extcon_get_state(edev, EXTCON_USB_HOST));
+
+ /* default as host, switch to device mode if needed */
+ if (extcon_get_state(edev, EXTCON_USB_HOST) == false)
+ ssusb_set_mailbox(otg_sx, MTU3_ID_FLOAT);
+ if (extcon_get_state(edev, EXTCON_USB) == true)
+ ssusb_set_mailbox(otg_sx, MTU3_VBUS_VALID);
+
+ return 0;
+}
+
+/*
+ * 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.
+ */
+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) {
+ ssusb_set_force_mode(ssusb, MTU3_DR_FORCE_HOST);
+ ssusb_set_mailbox(otg_sx, MTU3_VBUS_OFF);
+ ssusb_set_mailbox(otg_sx, MTU3_ID_GROUND);
+ } else {
+ ssusb_set_force_mode(ssusb, MTU3_DR_FORCE_DEVICE);
+ ssusb_set_mailbox(otg_sx, MTU3_ID_FLOAT);
+ ssusb_set_mailbox(otg_sx, MTU3_VBUS_VALID);
+ }
+}
+
+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 int ssusb_vbus_show(struct seq_file *sf, void *unused)
+{
+ struct ssusb_mtk *ssusb = sf->private;
+ struct otg_switch_mtk *otg_sx = &ssusb->otg_switch;
+
+ seq_printf(sf, "vbus state: %s\n(echo on/off)\n",
+ regulator_is_enabled(otg_sx->vbus) ? "on" : "off");
+
+ return 0;
+}
+
+static int ssusb_vbus_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, ssusb_vbus_show, inode->i_private);
+}
+
+static ssize_t ssusb_vbus_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;
+ struct otg_switch_mtk *otg_sx = &ssusb->otg_switch;
+ char buf[16];
+ bool enable;
+
+ if (copy_from_user(&buf, ubuf, min_t(size_t, sizeof(buf) - 1, count)))
+ return -EFAULT;
+
+ if (kstrtobool(buf, &enable)) {
+ dev_err(ssusb->dev, "wrong setting\n");
+ return -EINVAL;
+ }
+
+ ssusb_set_vbus(otg_sx, enable);
+
+ return count;
+}
+
+static const struct file_operations ssusb_vbus_fops = {
+ .open = ssusb_vbus_open,
+ .write = ssusb_vbus_write,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+static void ssusb_debugfs_init(struct ssusb_mtk *ssusb)
+{
+ struct dentry *root;
+
+ root = debugfs_create_dir(dev_name(ssusb->dev), usb_debug_root);
+ ssusb->dbgfs_root = root;
+
+ debugfs_create_file("mode", 0644, root, ssusb, &ssusb_mode_fops);
+ debugfs_create_file("vbus", 0644, root, ssusb, &ssusb_vbus_fops);
+}
+
+static void ssusb_debugfs_exit(struct ssusb_mtk *ssusb)
+{
+ debugfs_remove_recursive(ssusb->dbgfs_root);
+}
+
+void ssusb_set_force_mode(struct ssusb_mtk *ssusb,
+ enum mtu3_dr_force_mode mode)
+{
+ u32 value;
+
+ value = mtu3_readl(ssusb->ippc_base, SSUSB_U2_CTRL(0));
+ switch (mode) {
+ case MTU3_DR_FORCE_DEVICE:
+ value |= SSUSB_U2_PORT_FORCE_IDDIG | SSUSB_U2_PORT_RG_IDDIG;
+ break;
+ case MTU3_DR_FORCE_HOST:
+ value |= SSUSB_U2_PORT_FORCE_IDDIG;
+ value &= ~SSUSB_U2_PORT_RG_IDDIG;
+ break;
+ case MTU3_DR_FORCE_NONE:
+ value &= ~(SSUSB_U2_PORT_FORCE_IDDIG | SSUSB_U2_PORT_RG_IDDIG);
+ break;
+ default:
+ return;
+ }
+ mtu3_writel(ssusb->ippc_base, SSUSB_U2_CTRL(0), value);
+}
+
+int ssusb_otg_switch_init(struct ssusb_mtk *ssusb)
+{
+ struct otg_switch_mtk *otg_sx = &ssusb->otg_switch;
+
+ INIT_WORK(&otg_sx->id_work, ssusb_id_work);
+ INIT_WORK(&otg_sx->vbus_work, ssusb_vbus_work);
+
+ if (otg_sx->manual_drd_enabled)
+ ssusb_debugfs_init(ssusb);
+ else
+ ssusb_extcon_register(otg_sx);
+
+ return 0;
+}
+
+void ssusb_otg_switch_exit(struct ssusb_mtk *ssusb)
+{
+ struct otg_switch_mtk *otg_sx = &ssusb->otg_switch;
+
+ if (otg_sx->manual_drd_enabled)
+ ssusb_debugfs_exit(ssusb);
+
+ cancel_work_sync(&otg_sx->id_work);
+ cancel_work_sync(&otg_sx->vbus_work);
+}