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From:   JC Kuo <jckuo@nvidia.com>
To:     <gregkh@linuxfoundation.org>, <thierry.reding@gmail.com>,
        <robh@kernel.org>, <jonathanh@nvidia.com>, <kishon@ti.com>
CC:     <linux-tegra@vger.kernel.org>, <linux-usb@vger.kernel.org>,
        <linux-kernel@vger.kernel.org>, <devicetree@vger.kernel.org>,
        <nkristam@nvidia.com>, JC Kuo <jckuo@nvidia.com>
Subject: [PATCH v3 07/15] phy: tegra: xusb: Add sleepwalk and suspend/resume
Date:   Wed, 9 Sep 2020 16:10:33 +0800
Message-ID: <20200909081041.3190157-8-jckuo@nvidia.com>
In-Reply-To: <20200909081041.3190157-1-jckuo@nvidia.com>
References: <20200909081041.3190157-1-jckuo@nvidia.com>
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Sender: linux-kernel-owner@vger.kernel.org
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This commit adds sleepwalk/wake and suspend/resume interfaces
to Tegra XUSB PHY driver.

Tegra XUSB host controller driver makes use of sleepwalk functions
to enable/disable sleepwalk circuit which is in always-on partition
and can respond to USB resume signals when controller is not powered.
Sleepwalk can be enabled/disabled for any USB UPHY individually.

  - tegra_xusb_padctl_enable_phy_sleepwalk()
  - tegra_xusb_padctl_disable_phy_sleepwalk()

Tegra XUSB host controller driver makes use of wake functions to
enable/disable/query wake circuit which is in always-on partition
can wake system up when USB resume happens.
Wake circuit can be enabled/disabled for any USB PHY individually.

  - tegra_xusb_padctl_enable_phy_wake()
  - tegra_xusb_padctl_disable_phy_wake()
  - tegra_xusb_padctl_remote_wake_detected()

This commit also adds two system suspend stubs that can be used to
save and restore XUSB PADCTL context during system suspend and
resume.
  - tegra_xusb_padctl_suspend_noirq()
  - tegra_xusb_padctl_resume_noirq()

Signed-off-by: JC Kuo <jckuo@nvidia.com>
---
v3:
   commit message improvement, no change in code

 drivers/phy/tegra/xusb.c       | 73 ++++++++++++++++++++++++++++++++++
 drivers/phy/tegra/xusb.h       |  9 +++++
 include/linux/phy/tegra/xusb.h |  8 ++++
 3 files changed, 90 insertions(+)

diff --git a/drivers/phy/tegra/xusb.c b/drivers/phy/tegra/xusb.c
index b92478a350df..bc700e6a5519 100644
--- a/drivers/phy/tegra/xusb.c
+++ b/drivers/phy/tegra/xusb.c
@@ -1274,10 +1274,36 @@ static int tegra_xusb_padctl_remove(struct platform=
_device *pdev)
 	return err;
 }
=20
+static int tegra_xusb_padctl_suspend_noirq(struct device *dev)
+{
+	struct tegra_xusb_padctl *padctl =3D dev_get_drvdata(dev);
+
+	if (padctl->soc && padctl->soc->ops && padctl->soc->ops->suspend_noirq)
+		return padctl->soc->ops->suspend_noirq(padctl);
+
+	return 0;
+}
+
+static int tegra_xusb_padctl_resume_noirq(struct device *dev)
+{
+	struct tegra_xusb_padctl *padctl =3D dev_get_drvdata(dev);
+
+	if (padctl->soc && padctl->soc->ops && padctl->soc->ops->resume_noirq)
+		return padctl->soc->ops->resume_noirq(padctl);
+
+	return 0;
+}
+
+static const struct dev_pm_ops tegra_xusb_padctl_pm_ops =3D {
+	SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(tegra_xusb_padctl_suspend_noirq,
+				      tegra_xusb_padctl_resume_noirq)
+};
+
 static struct platform_driver tegra_xusb_padctl_driver =3D {
 	.driver =3D {
 		.name =3D "tegra-xusb-padctl",
 		.of_match_table =3D tegra_xusb_padctl_of_match,
+		.pm =3D &tegra_xusb_padctl_pm_ops,
 	},
 	.probe =3D tegra_xusb_padctl_probe,
 	.remove =3D tegra_xusb_padctl_remove,
@@ -1344,6 +1370,53 @@ int tegra_xusb_padctl_hsic_set_idle(struct tegra_xus=
b_padctl *padctl,
 }
 EXPORT_SYMBOL_GPL(tegra_xusb_padctl_hsic_set_idle);
=20
+int tegra_xusb_padctl_enable_phy_sleepwalk(struct tegra_xusb_padctl *padct=
l, struct phy *phy,
+					   enum usb_device_speed speed)
+{
+	if (padctl->soc->ops->enable_phy_sleepwalk)
+		return padctl->soc->ops->enable_phy_sleepwalk(padctl, phy,
+							      speed);
+
+	return -ENOTSUPP;
+}
+EXPORT_SYMBOL_GPL(tegra_xusb_padctl_enable_phy_sleepwalk);
+
+int tegra_xusb_padctl_disable_phy_sleepwalk(struct tegra_xusb_padctl *padc=
tl, struct phy *phy)
+{
+	if (padctl->soc->ops->disable_phy_sleepwalk)
+		return padctl->soc->ops->disable_phy_sleepwalk(padctl, phy);
+
+	return -ENOTSUPP;
+}
+EXPORT_SYMBOL_GPL(tegra_xusb_padctl_disable_phy_sleepwalk);
+
+int tegra_xusb_padctl_enable_phy_wake(struct tegra_xusb_padctl *padctl, st=
ruct phy *phy)
+{
+	if (padctl->soc->ops->enable_phy_wake)
+		return padctl->soc->ops->enable_phy_wake(padctl, phy);
+
+	return -ENOTSUPP;
+}
+EXPORT_SYMBOL_GPL(tegra_xusb_padctl_enable_phy_wake);
+
+int tegra_xusb_padctl_disable_phy_wake(struct tegra_xusb_padctl *padctl, s=
truct phy *phy)
+{
+	if (padctl->soc->ops->disable_phy_wake)
+		return padctl->soc->ops->disable_phy_wake(padctl, phy);
+
+	return -ENOTSUPP;
+}
+EXPORT_SYMBOL_GPL(tegra_xusb_padctl_disable_phy_wake);
+
+bool tegra_xusb_padctl_remote_wake_detected(struct tegra_xusb_padctl *padc=
tl, struct phy *phy)
+{
+	if (padctl->soc->ops->remote_wake_detected)
+		return padctl->soc->ops->remote_wake_detected(phy);
+
+	return false;
+}
+EXPORT_SYMBOL_GPL(tegra_xusb_padctl_remote_wake_detected);
+
 int tegra_xusb_padctl_usb3_set_lfps_detect(struct tegra_xusb_padctl *padct=
l,
 					   unsigned int port, bool enable)
 {
diff --git a/drivers/phy/tegra/xusb.h b/drivers/phy/tegra/xusb.h
index 9463bc74729e..c796344e3062 100644
--- a/drivers/phy/tegra/xusb.h
+++ b/drivers/phy/tegra/xusb.h
@@ -11,6 +11,7 @@
 #include <linux/mutex.h>
 #include <linux/workqueue.h>
=20
+#include <linux/usb/ch9.h>
 #include <linux/usb/otg.h>
 #include <linux/usb/role.h>
=20
@@ -396,6 +397,8 @@ struct tegra_xusb_padctl_ops {
 			 const struct tegra_xusb_padctl_soc *soc);
 	void (*remove)(struct tegra_xusb_padctl *padctl);
=20
+	int (*suspend_noirq)(struct tegra_xusb_padctl *padctl);
+	int (*resume_noirq)(struct tegra_xusb_padctl *padctl);
 	int (*usb3_save_context)(struct tegra_xusb_padctl *padctl,
 				 unsigned int index);
 	int (*hsic_set_idle)(struct tegra_xusb_padctl *padctl,
@@ -404,6 +407,12 @@ struct tegra_xusb_padctl_ops {
 				    unsigned int index, bool enable);
 	int (*vbus_override)(struct tegra_xusb_padctl *padctl, bool set);
 	int (*utmi_port_reset)(struct phy *phy);
+	int (*enable_phy_sleepwalk)(struct tegra_xusb_padctl *padctl, struct phy =
*phy,
+				    enum usb_device_speed speed);
+	int (*disable_phy_sleepwalk)(struct tegra_xusb_padctl *padctl, struct phy=
 *phy);
+	int (*enable_phy_wake)(struct tegra_xusb_padctl *padctl, struct phy *phy)=
;
+	int (*disable_phy_wake)(struct tegra_xusb_padctl *padctl, struct phy *phy=
);
+	bool (*remote_wake_detected)(struct phy *phy);
 };
=20
 struct tegra_xusb_padctl_soc {
diff --git a/include/linux/phy/tegra/xusb.h b/include/linux/phy/tegra/xusb.=
h
index 71d956935405..f24d4744db17 100644
--- a/include/linux/phy/tegra/xusb.h
+++ b/include/linux/phy/tegra/xusb.h
@@ -8,6 +8,7 @@
=20
 struct tegra_xusb_padctl;
 struct device;
+enum usb_device_speed;
=20
 struct tegra_xusb_padctl *tegra_xusb_padctl_get(struct device *dev);
 void tegra_xusb_padctl_put(struct tegra_xusb_padctl *padctl);
@@ -23,4 +24,11 @@ int tegra_xusb_padctl_set_vbus_override(struct tegra_xus=
b_padctl *padctl,
 int tegra_phy_xusb_utmi_port_reset(struct phy *phy);
 int tegra_xusb_padctl_get_usb3_companion(struct tegra_xusb_padctl *padctl,
 					 unsigned int port);
+int tegra_xusb_padctl_enable_phy_sleepwalk(struct tegra_xusb_padctl *padct=
l, struct phy *phy,
+					   enum usb_device_speed speed);
+int tegra_xusb_padctl_disable_phy_sleepwalk(struct tegra_xusb_padctl *padc=
tl, struct phy *phy);
+int tegra_xusb_padctl_enable_phy_wake(struct tegra_xusb_padctl *padctl, st=
ruct phy *phy);
+int tegra_xusb_padctl_disable_phy_wake(struct tegra_xusb_padctl *padctl, s=
truct phy *phy);
+bool tegra_xusb_padctl_remote_wake_detected(struct tegra_xusb_padctl *padc=
tl, struct phy *phy);
+
 #endif /* PHY_TEGRA_XUSB_H */
--=20
2.25.1