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From:   Raveendra Padasalagi <raveendra.padasalagi@broadcom.com>
To:     Rob Herring <robh+dt@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Kishon Vijay Abraham I <kishon@ti.com>,
        Russell King <linux@armlinux.org.uk>,
        Scott Branden <sbranden@broadcom.com>,
        Ray Jui <rjui@broadcom.com>,
        Srinath Mannam <srinath.mannam@broadcom.com>,
        Vikram Prakash <vikram.prakash@broadcom.com>,
        Jon Mason <jonmason@broadcom.com>,
        Florian Fainelli <f.fainelli@gmail.com>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>,
        Raviteja Garimella <raviteja.garimella@broadcom.com>,
        Rafal Milecki <rafal@milecki.pl>,
        Arnd Bergmann <arnd@arndb.de>,
        Viresh Kumar <viresh.kumar@linaro.org>,
        Jaehoon Chung <jh80.chung@samsung.com>
Cc:     devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-kernel@vger.kernel.org,
        bcm-kernel-feedback-list@broadcom.com,
        Raveendra Padasalagi <raveendra.padasalagi@broadcom.com>
Subject: [PATCH v2 2/3] drivers: phy: broadcom: Add driver for Cygnus USB phy controller
Date:   Wed,  8 Nov 2017 13:16:42 +0530
Message-Id: <1510127203-5815-3-git-send-email-raveendra.padasalagi@broadcom.com>
In-Reply-To: <1510127203-5815-1-git-send-email-raveendra.padasalagi@broadcom.com>
References: <1510127203-5815-1-git-send-email-raveendra.padasalagi@broadcom.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Add driver for Broadcom's USB phy controller's used in Cygnus
familyof SoC. Cygnus has three USB phy controller's, port 0,
port 1 provides USB host functionality and port 2 can be configured
for host/device role.

Configuration of host/device role for port 2 is achieved based on
the extcon events, the driver registers to extcon framework to get
appropriate connect events for Host/Device cables connect/disconnect
states based on VBUS and ID interrupts.

Signed-off-by: Raveendra Padasalagi <raveendra.padasalagi@broadcom.com>
---
 drivers/phy/broadcom/Kconfig              |  14 +
 drivers/phy/broadcom/Makefile             |   1 +
 drivers/phy/broadcom/phy-bcm-cygnus-usb.c | 690 ++++++++++++++++++++++++++++++
 3 files changed, 705 insertions(+)
 create mode 100644 drivers/phy/broadcom/phy-bcm-cygnus-usb.c

diff --git a/drivers/phy/broadcom/Kconfig b/drivers/phy/broadcom/Kconfig
index 64fc59c..3179daf 100644
--- a/drivers/phy/broadcom/Kconfig
+++ b/drivers/phy/broadcom/Kconfig
@@ -1,6 +1,20 @@
 #
 # Phy drivers for Broadcom platforms
 #
+config PHY_BCM_CYGNUS_USB
+	tristate "Broadcom Cygnus USB PHY support"
+	depends on OF
+	depends on ARCH_BCM_CYGNUS || COMPILE_TEST
+	select GENERIC_PHY
+	select EXTCON_USB_GPIO
+	default ARCH_BCM_CYGNUS
+	help
+	  Enable this to support three USB PHY's present in Broadcom's
+	  Cygnus chip.
+
+	  The phys are capable of supporting host mode on all ports and
+	  device mode for port 2.
+
 config PHY_CYGNUS_PCIE
 	tristate "Broadcom Cygnus PCIe PHY driver"
 	depends on OF && (ARCH_BCM_CYGNUS || COMPILE_TEST)
diff --git a/drivers/phy/broadcom/Makefile b/drivers/phy/broadcom/Makefile
index 4eb82ec..3dec23c 100644
--- a/drivers/phy/broadcom/Makefile
+++ b/drivers/phy/broadcom/Makefile
@@ -1,4 +1,5 @@
 obj-$(CONFIG_PHY_CYGNUS_PCIE)		+= phy-bcm-cygnus-pcie.o
+obj-$(CONFIG_PHY_BCM_CYGNUS_USB)	+= phy-bcm-cygnus-usb.o
 obj-$(CONFIG_BCM_KONA_USB2_PHY)		+= phy-bcm-kona-usb2.o
 obj-$(CONFIG_PHY_BCM_NS_USB2)		+= phy-bcm-ns-usb2.o
 obj-$(CONFIG_PHY_BCM_NS_USB3)		+= phy-bcm-ns-usb3.o
diff --git a/drivers/phy/broadcom/phy-bcm-cygnus-usb.c b/drivers/phy/broadcom/phy-bcm-cygnus-usb.c
new file mode 100644
index 0000000..cf957d4
--- /dev/null
+++ b/drivers/phy/broadcom/phy-bcm-cygnus-usb.c
@@ -0,0 +1,690 @@
+/*
+ * Copyright 2017 Broadcom
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation (the "GPL").
+ *
+ * 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 version 2 (GPLv2) for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * version 2 (GPLv2) along with this source code.
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/phy/phy.h>
+#include <linux/delay.h>
+#include <linux/regulator/consumer.h>
+#include <linux/extcon.h>
+#include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
+#include <linux/interrupt.h>
+
+/* CDRU Block Register Offsets and bit definitions */
+#define CDRU_USBPHY_CLK_RST_SEL_OFFSET			0x0
+#define CDRU_USBPHY2_HOST_DEV_SEL_OFFSET		0x4
+#define CDRU_USB_DEV_SUSPEND_RESUME_CTRL_OFFSET		0x5C
+#define CDRU_USBPHY_P0_STATUS_OFFSET			0x1C
+#define CDRU_USBPHY_P1_STATUS_OFFSET			0x34
+#define CDRU_USBPHY_P2_STATUS_OFFSET			0x4C
+
+#define CDRU_USBPHY_USBPHY_ILDO_ON_FLAG			BIT(1)
+#define CDRU_USBPHY_USBPHY_PLL_LOCK			BIT(0)
+#define CDRU_USB_DEV_SUSPEND_RESUME_CTRL_DISABLE	BIT(0)
+
+/* CRMU Block Register Offsets and bit definitions */
+#define CRMU_USB_PHY_AON_CTRL_OFFSET			0x0
+#define CRMU_USBPHY_P0_AFE_CORERDY_VDDC			BIT(1)
+#define CRMU_USBPHY_P0_RESETB				BIT(2)
+#define CRMU_USBPHY_P1_AFE_CORERDY_VDDC			BIT(9)
+#define CRMU_USBPHY_P1_RESETB				BIT(10)
+#define CRMU_USBPHY_P2_AFE_CORERDY_VDDC			BIT(17)
+#define CRMU_USBPHY_P2_RESETB				BIT(18)
+
+/* USB2 IDM Block register Offset and bit definitions */
+#define USB2_IDM_IDM_IO_CONTROL_DIRECT_OFFSET		0x0408
+#define USB2_IDM_IDM_IO_CONTROL_DIRECT_CLK_ENABLE	BIT(0)
+#define SUSPEND_OVERRIDE_0				BIT(13)
+#define SUSPEND_OVERRIDE_0_POS				13
+#define SUSPEND_OVERRIDE_1				BIT(14)
+#define SUSPEND_OVERRIDE_1_POS				14
+#define SUSPEND_OVERRIDE_2				BIT(15)
+#define SUSPEND_OVERRIDE_2_POS				15
+
+#define USB2_IDM_IDM_RESET_CONTROL_OFFSET		0x0800
+#define USB2_IDM_IDM_RESET_CONTROL__RESET		BIT(0)
+#define USB2D_IDM_IDM_IO_SS_CLEAR_NAK_NEMPTY_EN_I	BIT(24)
+
+#define PHY2_DEV_HOST_CTRL_SEL_DEVICE			0
+#define PHY2_DEV_HOST_CTRL_SEL_HOST			1
+#define PHY2_DEV_HOST_CTRL_SEL_IDLE			2
+
+#define PLL_LOCK_RETRY_COUNT				1000
+#define MAX_REGULATOR_NAME_LEN				25
+#define DUAL_ROLE_PHY					2
+
+#define USBPHY_WQ_DELAY_MS		msecs_to_jiffies(500)
+#define USB2_SEL_DEVICE			0
+#define USB2_SEL_HOST			1
+#define USB2_SEL_IDLE			2
+#define USB_CONNECTED			1
+#define USB_DISCONNECTED		0
+#define MAX_NUM_PHYS			3
+
+static const int status_reg[] = {CDRU_USBPHY_P0_STATUS_OFFSET,
+				CDRU_USBPHY_P1_STATUS_OFFSET,
+				CDRU_USBPHY_P2_STATUS_OFFSET};
+
+struct cygnus_phy_instance;
+
+struct cygnus_phy_driver {
+	void __iomem *cdru_usbphy_regs;
+	void __iomem *crmu_usbphy_aon_ctrl_regs;
+	void __iomem *usb2h_idm_regs;
+	void __iomem *usb2d_idm_regs;
+	int num_phys;
+	bool idm_host_enabled;
+	struct cygnus_phy_instance *instances;
+	int phyto_src_clk;
+	struct platform_device *pdev;
+};
+
+struct cygnus_phy_instance {
+	struct cygnus_phy_driver *driver;
+	struct phy *generic_phy;
+	int port;
+	int new_state;		/* 1 - Host, 0 - device, 2 - idle*/
+	bool power;		/* 1 - powered_on 0 - powered off */
+	struct regulator *vbus_supply;
+	spinlock_t lock;
+	struct extcon_dev *edev;
+	struct notifier_block	device_nb;
+	struct notifier_block	host_nb;
+};
+
+static inline int phy_pll_lock_stat(u32 usb_reg, int bit_mask,
+				    struct cygnus_phy_driver *phy_driver)
+{
+	/* Wait for the PLL lock status */
+	int retry = PLL_LOCK_RETRY_COUNT;
+	u32 reg_val;
+
+	do {
+		udelay(1);
+		reg_val = readl(phy_driver->cdru_usbphy_regs +
+				usb_reg);
+		if (reg_val & bit_mask)
+			return 0;
+	} while (--retry > 0);
+
+	return -EBUSY;
+}
+
+static struct phy *cygnus_phy_xlate(struct device *dev,
+				    struct of_phandle_args *args)
+{
+	struct cygnus_phy_driver *phy_driver = dev_get_drvdata(dev);
+	struct cygnus_phy_instance *instance_ptr;
+
+	if (!phy_driver)
+		return ERR_PTR(-EINVAL);
+
+	if (WARN_ON(args->args[0] >= phy_driver->num_phys))
+		return ERR_PTR(-ENODEV);
+
+	if (WARN_ON(args->args_count < 1))
+		return ERR_PTR(-EINVAL);
+
+	instance_ptr = &phy_driver->instances[args->args[0]];
+	if (instance_ptr->port > phy_driver->phyto_src_clk)
+		phy_driver->phyto_src_clk = instance_ptr->port;
+
+	if (instance_ptr->port == DUAL_ROLE_PHY)
+		goto ret_p2;
+	phy_driver->instances[instance_ptr->port].new_state =
+						PHY2_DEV_HOST_CTRL_SEL_HOST;
+
+ret_p2:
+	return phy_driver->instances[instance_ptr->port].generic_phy;
+}
+
+static void cygnus_usbp2_dev_clock_init(struct phy *generic_phy, bool enable)
+{
+	u32 reg_val;
+	struct cygnus_phy_instance *instance_ptr = phy_get_drvdata(generic_phy);
+	struct cygnus_phy_driver *phy_driver = instance_ptr->driver;
+
+	reg_val = readl(phy_driver->usb2d_idm_regs +
+			USB2_IDM_IDM_IO_CONTROL_DIRECT_OFFSET);
+
+	if (enable)
+		reg_val |= USB2_IDM_IDM_IO_CONTROL_DIRECT_CLK_ENABLE;
+	else
+		reg_val &= ~USB2_IDM_IDM_IO_CONTROL_DIRECT_CLK_ENABLE;
+
+	writel(reg_val, phy_driver->usb2d_idm_regs +
+		USB2_IDM_IDM_IO_CONTROL_DIRECT_OFFSET);
+
+	reg_val = readl(phy_driver->usb2d_idm_regs +
+			USB2_IDM_IDM_RESET_CONTROL_OFFSET);
+
+	if (enable)
+		reg_val &= ~USB2_IDM_IDM_RESET_CONTROL__RESET;
+	else
+		reg_val |= USB2_IDM_IDM_RESET_CONTROL__RESET;
+
+	writel(reg_val, phy_driver->usb2d_idm_regs +
+		USB2_IDM_IDM_RESET_CONTROL_OFFSET);
+}
+
+static void cygnus_phy_clk_reset_src_switch(struct phy *generic_phy,
+					    u32 src_phy)
+{
+	u32 reg_val;
+	struct cygnus_phy_instance *instance_ptr = phy_get_drvdata(generic_phy);
+	struct cygnus_phy_driver *phy_driver = instance_ptr->driver;
+
+	writel(src_phy, phy_driver->cdru_usbphy_regs +
+		CDRU_USBPHY_CLK_RST_SEL_OFFSET);
+
+	/* Force the clock/reset source phy to not suspend */
+	reg_val = readl(phy_driver->usb2h_idm_regs +
+			USB2_IDM_IDM_IO_CONTROL_DIRECT_OFFSET);
+	reg_val &= ~(SUSPEND_OVERRIDE_0 | SUSPEND_OVERRIDE_1 |
+			SUSPEND_OVERRIDE_2);
+
+	reg_val |= BIT(SUSPEND_OVERRIDE_0_POS + src_phy);
+
+	writel(reg_val, phy_driver->usb2h_idm_regs +
+		USB2_IDM_IDM_IO_CONTROL_DIRECT_OFFSET);
+}
+
+static void cygnus_phy_dual_role_init(struct cygnus_phy_instance *instance_ptr)
+{
+	u32 reg_val;
+	struct cygnus_phy_driver *phy_driver = instance_ptr->driver;
+
+	if (instance_ptr->new_state == PHY2_DEV_HOST_CTRL_SEL_HOST) {
+		writel(PHY2_DEV_HOST_CTRL_SEL_HOST,
+			phy_driver->cdru_usbphy_regs +
+			CDRU_USBPHY2_HOST_DEV_SEL_OFFSET);
+		return;
+	}
+
+	/*
+	 * Disable suspend/resume signals to device controller
+	 * when a port is in device mode
+	 */
+	writel(PHY2_DEV_HOST_CTRL_SEL_DEVICE,
+		phy_driver->cdru_usbphy_regs +
+		CDRU_USBPHY2_HOST_DEV_SEL_OFFSET);
+	reg_val = readl(phy_driver->cdru_usbphy_regs +
+			CDRU_USB_DEV_SUSPEND_RESUME_CTRL_OFFSET);
+	reg_val |= CDRU_USB_DEV_SUSPEND_RESUME_CTRL_DISABLE;
+	writel(reg_val, phy_driver->cdru_usbphy_regs +
+			CDRU_USB_DEV_SUSPEND_RESUME_CTRL_OFFSET);
+}
+
+static int cygnus_phy_init(struct phy *generic_phy)
+{
+	struct cygnus_phy_instance *instance_ptr = phy_get_drvdata(generic_phy);
+
+	if (instance_ptr->port == DUAL_ROLE_PHY)
+		cygnus_phy_dual_role_init(instance_ptr);
+
+	return 0;
+}
+
+static int cygnus_phy_shutdown(struct phy *generic_phy)
+{
+	u32 reg_val;
+	int i, ret;
+	unsigned long flags;
+	bool power_off_flag = true;
+	struct cygnus_phy_instance *instance_ptr = phy_get_drvdata(generic_phy);
+	struct cygnus_phy_driver *phy_driver = instance_ptr->driver;
+
+	if (instance_ptr->vbus_supply) {
+		ret = regulator_disable(instance_ptr->vbus_supply);
+		if (ret) {
+			dev_err(&generic_phy->dev,
+					"Failed to disable regulator\n");
+			return ret;
+		}
+	}
+
+	spin_lock_irqsave(&instance_ptr->lock, flags);
+
+	/* power down the phy */
+	reg_val = readl(phy_driver->crmu_usbphy_aon_ctrl_regs +
+			CRMU_USB_PHY_AON_CTRL_OFFSET);
+	if (instance_ptr->port == 0) {
+		reg_val &= ~CRMU_USBPHY_P0_AFE_CORERDY_VDDC;
+		reg_val &= ~CRMU_USBPHY_P0_RESETB;
+	} else if (instance_ptr->port == 1) {
+		reg_val &= ~CRMU_USBPHY_P1_AFE_CORERDY_VDDC;
+		reg_val &= ~CRMU_USBPHY_P1_RESETB;
+	} else if (instance_ptr->port == 2) {
+		reg_val &= ~CRMU_USBPHY_P2_AFE_CORERDY_VDDC;
+		reg_val &= ~CRMU_USBPHY_P2_RESETB;
+	}
+	writel(reg_val, phy_driver->crmu_usbphy_aon_ctrl_regs +
+		CRMU_USB_PHY_AON_CTRL_OFFSET);
+
+	instance_ptr->power = false;
+
+	/* Determine whether all the phy's are powered off */
+	for (i = 0; i < phy_driver->num_phys; i++) {
+		if (phy_driver->instances[i].power == true) {
+			power_off_flag = false;
+			break;
+		}
+	}
+
+	/* Disable clock to USB device and keep the USB device in reset */
+	if (instance_ptr->port == DUAL_ROLE_PHY)
+		cygnus_usbp2_dev_clock_init(instance_ptr->generic_phy,
+					    false);
+
+	/*
+	 * Put the host controller into reset state and
+	 * disable clock if all the phy's are powered off
+	 */
+	if (power_off_flag) {
+		reg_val = readl(phy_driver->usb2h_idm_regs +
+			USB2_IDM_IDM_IO_CONTROL_DIRECT_OFFSET);
+		reg_val &= ~USB2_IDM_IDM_IO_CONTROL_DIRECT_CLK_ENABLE;
+		writel(reg_val, phy_driver->usb2h_idm_regs +
+				USB2_IDM_IDM_IO_CONTROL_DIRECT_OFFSET);
+
+		reg_val = readl(phy_driver->usb2h_idm_regs +
+				 USB2_IDM_IDM_RESET_CONTROL_OFFSET);
+		reg_val |= USB2_IDM_IDM_RESET_CONTROL__RESET;
+		writel(reg_val, phy_driver->usb2h_idm_regs +
+				USB2_IDM_IDM_RESET_CONTROL_OFFSET);
+		phy_driver->idm_host_enabled = false;
+	}
+	spin_unlock_irqrestore(&instance_ptr->lock, flags);
+	return 0;
+}
+
+static int cygnus_phy_poweron(struct phy *generic_phy)
+{
+	int ret;
+	unsigned long flags;
+	u32 reg_val;
+	struct cygnus_phy_instance *instance_ptr = phy_get_drvdata(generic_phy);
+	struct cygnus_phy_driver *phy_driver = instance_ptr->driver;
+	u32 extcon_event = instance_ptr->new_state;
+
+	/*
+	 * Switch on the regulator only if in HOST mode
+	 */
+	if (instance_ptr->vbus_supply) {
+		ret = regulator_enable(instance_ptr->vbus_supply);
+		if (ret) {
+			dev_err(&generic_phy->dev,
+				"Failed to enable regulator\n");
+			goto err_shutdown;
+		}
+	}
+
+	spin_lock_irqsave(&instance_ptr->lock, flags);
+	/* Bring the AFE block out of reset to start powering up the PHY */
+	reg_val = readl(phy_driver->crmu_usbphy_aon_ctrl_regs +
+			CRMU_USB_PHY_AON_CTRL_OFFSET);
+	if (instance_ptr->port == 0)
+		reg_val |= CRMU_USBPHY_P0_AFE_CORERDY_VDDC;
+	else if (instance_ptr->port == 1)
+		reg_val |= CRMU_USBPHY_P1_AFE_CORERDY_VDDC;
+	else if (instance_ptr->port == 2)
+		reg_val |= CRMU_USBPHY_P2_AFE_CORERDY_VDDC;
+	writel(reg_val, phy_driver->crmu_usbphy_aon_ctrl_regs +
+		CRMU_USB_PHY_AON_CTRL_OFFSET);
+
+	/* Check for power on and PLL lock */
+	ret = phy_pll_lock_stat(status_reg[instance_ptr->port],
+				CDRU_USBPHY_USBPHY_ILDO_ON_FLAG, phy_driver);
+	if (ret < 0) {
+		dev_err(&generic_phy->dev,
+			"Timed out waiting for USBPHY_ILDO_ON_FLAG on port %d",
+			instance_ptr->port);
+		spin_unlock_irqrestore(&instance_ptr->lock, flags);
+		goto err_shutdown;
+	}
+	ret = phy_pll_lock_stat(status_reg[instance_ptr->port],
+				CDRU_USBPHY_USBPHY_PLL_LOCK, phy_driver);
+	if (ret < 0) {
+		dev_err(&generic_phy->dev,
+			"Timed out waiting for USBPHY_PLL_LOCK on port %d",
+			instance_ptr->port);
+		spin_unlock_irqrestore(&instance_ptr->lock, flags);
+		goto err_shutdown;
+	}
+
+	instance_ptr->power = true;
+
+	/* Enable clock to USB device and take the USB device out of reset */
+	if (instance_ptr->port == DUAL_ROLE_PHY)
+		cygnus_usbp2_dev_clock_init(instance_ptr->generic_phy, true);
+
+	/* Set clock source provider to be the last powered on phy */
+	if (instance_ptr->port == phy_driver->phyto_src_clk)
+		cygnus_phy_clk_reset_src_switch(generic_phy,
+				instance_ptr->port);
+
+	if (phy_driver->idm_host_enabled != true &&
+		extcon_event == PHY2_DEV_HOST_CTRL_SEL_HOST) {
+		/* Enable clock to USB host and take the host out of reset */
+		reg_val = readl(phy_driver->usb2h_idm_regs +
+				USB2_IDM_IDM_IO_CONTROL_DIRECT_OFFSET);
+		reg_val |= USB2_IDM_IDM_IO_CONTROL_DIRECT_CLK_ENABLE;
+		writel(reg_val, phy_driver->usb2h_idm_regs +
+				USB2_IDM_IDM_IO_CONTROL_DIRECT_OFFSET);
+
+		reg_val = readl(phy_driver->usb2h_idm_regs +
+				USB2_IDM_IDM_RESET_CONTROL_OFFSET);
+		reg_val &= ~USB2_IDM_IDM_RESET_CONTROL__RESET;
+		writel(reg_val, phy_driver->usb2h_idm_regs +
+				 USB2_IDM_IDM_RESET_CONTROL_OFFSET);
+		phy_driver->idm_host_enabled = true;
+	}
+	spin_unlock_irqrestore(&instance_ptr->lock, flags);
+
+	return 0;
+err_shutdown:
+	cygnus_phy_shutdown(generic_phy);
+	return ret;
+}
+
+static int usbd_connect_notify(struct notifier_block *self,
+			       unsigned long event, void *ptr)
+{
+	struct cygnus_phy_instance *instance_ptr = container_of(self,
+					struct cygnus_phy_instance, device_nb);
+
+	if (event) {
+		instance_ptr->new_state = PHY2_DEV_HOST_CTRL_SEL_DEVICE;
+		cygnus_phy_dual_role_init(instance_ptr);
+	}
+
+	return NOTIFY_OK;
+}
+
+static int usbh_connect_notify(struct notifier_block *self,
+			       unsigned long event, void *ptr)
+{
+	struct cygnus_phy_instance *instance_ptr = container_of(self,
+					struct cygnus_phy_instance, host_nb);
+	if (event) {
+		instance_ptr->new_state = PHY2_DEV_HOST_CTRL_SEL_HOST;
+		cygnus_phy_dual_role_init(instance_ptr);
+	}
+
+	return NOTIFY_OK;
+}
+
+static int cygnus_register_extcon_notifiers(
+				struct cygnus_phy_instance *instance_ptr)
+{
+	int ret = 0;
+	struct device *dev = &instance_ptr->generic_phy->dev;
+
+	if (of_property_read_bool(dev->of_node, "extcon")) {
+		instance_ptr->edev = extcon_get_edev_by_phandle(dev, 0);
+		if (IS_ERR(instance_ptr->edev)) {
+			if (PTR_ERR(instance_ptr->edev) == -EPROBE_DEFER)
+				return -EPROBE_DEFER;
+			ret = PTR_ERR(instance_ptr->edev);
+			goto err;
+		}
+
+		instance_ptr->device_nb.notifier_call = usbd_connect_notify;
+		ret = devm_extcon_register_notifier(dev,
+						instance_ptr->edev,
+						EXTCON_USB,
+						&instance_ptr->device_nb);
+		if (ret < 0) {
+			dev_err(dev, "Can't register extcon notifier\n");
+			goto err;
+		}
+
+		if (extcon_get_state(instance_ptr->edev, EXTCON_USB) == true) {
+			instance_ptr->new_state = PHY2_DEV_HOST_CTRL_SEL_DEVICE;
+			cygnus_phy_dual_role_init(instance_ptr);
+		}
+
+		instance_ptr->host_nb.notifier_call = usbh_connect_notify;
+		ret = devm_extcon_register_notifier(dev,
+						instance_ptr->edev,
+						EXTCON_USB_HOST,
+						&instance_ptr->host_nb);
+		if (ret < 0) {
+			dev_err(dev, "Can't register extcon notifier\n");
+			goto err;
+		}
+
+		if (extcon_get_state(instance_ptr->edev, EXTCON_USB_HOST)
+					== true) {
+			instance_ptr->new_state = PHY2_DEV_HOST_CTRL_SEL_HOST;
+			cygnus_phy_dual_role_init(instance_ptr);
+		}
+	} else {
+		dev_err(dev, "Extcon device handle not found\n");
+		return -EINVAL;
+	}
+
+	return 0;
+err:
+	return ret;
+}
+
+static const struct phy_ops ops = {
+	.init		= cygnus_phy_init,
+	.power_on	= cygnus_phy_poweron,
+	.power_off	= cygnus_phy_shutdown,
+	.owner = THIS_MODULE,
+};
+
+static void cygnus_phy_shutdown_all(struct cygnus_phy_driver *phy_driver)
+{
+	u32 reg_val;
+
+	/*
+	 * Shutdown all ports. They can be powered up as
+	 * required
+	 */
+	reg_val = readl(phy_driver->crmu_usbphy_aon_ctrl_regs +
+			CRMU_USB_PHY_AON_CTRL_OFFSET);
+	reg_val &= ~CRMU_USBPHY_P0_AFE_CORERDY_VDDC;
+	reg_val &= ~CRMU_USBPHY_P0_RESETB;
+	reg_val &= ~CRMU_USBPHY_P1_AFE_CORERDY_VDDC;
+	reg_val &= ~CRMU_USBPHY_P1_RESETB;
+	reg_val &= ~CRMU_USBPHY_P2_AFE_CORERDY_VDDC;
+	reg_val &= ~CRMU_USBPHY_P2_RESETB;
+	writel(reg_val, phy_driver->crmu_usbphy_aon_ctrl_regs +
+		CRMU_USB_PHY_AON_CTRL_OFFSET);
+}
+
+static int cygnus_phy_instance_create(struct cygnus_phy_driver *phy_driver)
+{
+	struct device_node *child;
+	char *vbus_name;
+	struct platform_device *pdev = phy_driver->pdev;
+	struct device *dev = &pdev->dev;
+	struct device_node *node = dev->of_node;
+	struct cygnus_phy_instance *instance_ptr;
+	unsigned int id, ret;
+
+	for_each_available_child_of_node(node, child) {
+		if (of_property_read_u32(child, "reg", &id)) {
+			dev_err(dev, "missing reg property for %s\n",
+				child->name);
+			ret = -EINVAL;
+			goto put_child;
+		}
+
+		if (id >= MAX_NUM_PHYS) {
+			dev_err(dev, "invalid PHY id: %u\n", id);
+			ret = -EINVAL;
+			goto put_child;
+		}
+
+		instance_ptr = &phy_driver->instances[id];
+		instance_ptr->driver = phy_driver;
+		instance_ptr->port = id;
+		spin_lock_init(&instance_ptr->lock);
+
+		if (instance_ptr->generic_phy) {
+			dev_err(dev, "duplicated PHY id: %u\n", id);
+			ret = -EINVAL;
+			goto put_child;
+		}
+
+		instance_ptr->generic_phy =
+				devm_phy_create(dev, child, &ops);
+		if (IS_ERR(instance_ptr->generic_phy)) {
+			dev_err(dev, "Failed to create usb phy %d", id);
+			ret = PTR_ERR(instance_ptr->generic_phy);
+			goto put_child;
+		}
+
+		vbus_name = devm_kzalloc(&instance_ptr->generic_phy->dev,
+					MAX_REGULATOR_NAME_LEN,
+					GFP_KERNEL);
+		if (!vbus_name) {
+			ret = -ENOMEM;
+			goto put_child;
+		}
+
+		/* regulator use is optional */
+		sprintf(vbus_name, "vbus-p%d", id);
+		instance_ptr->vbus_supply =
+			devm_regulator_get(&instance_ptr->generic_phy->dev,
+					vbus_name);
+		if (IS_ERR(instance_ptr->vbus_supply))
+			instance_ptr->vbus_supply = NULL;
+		devm_kfree(&instance_ptr->generic_phy->dev, vbus_name);
+		phy_set_drvdata(instance_ptr->generic_phy, instance_ptr);
+	}
+
+	return 0;
+
+put_child:
+	of_node_put(child);
+	return ret;
+}
+
+static int cygnus_phy_probe(struct platform_device *pdev)
+{
+	struct resource *res;
+	struct cygnus_phy_driver *phy_driver;
+	struct phy_provider *phy_provider;
+	int i, ret;
+	u32 reg_val;
+	struct device *dev = &pdev->dev;
+	struct device_node *node = dev->of_node;
+
+	/* allocate memory for each phy instance */
+	phy_driver = devm_kzalloc(dev, sizeof(struct cygnus_phy_driver),
+				  GFP_KERNEL);
+	if (!phy_driver)
+		return -ENOMEM;
+
+	phy_driver->num_phys = of_get_child_count(node);
+
+	if (phy_driver->num_phys == 0) {
+		dev_err(dev, "PHY no child node\n");
+		return -ENODEV;
+	}
+
+	phy_driver->instances = devm_kzalloc(dev, phy_driver->num_phys *
+					     sizeof(struct cygnus_phy_instance),
+					     GFP_KERNEL);
+	if (!phy_driver->instances)
+		return -ENOMEM;
+
+	phy_driver->pdev = pdev;
+	platform_set_drvdata(pdev, phy_driver);
+
+	ret = cygnus_phy_instance_create(phy_driver);
+	if (ret)
+		return ret;
+
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
+					   "crmu-usbphy-aon-ctrl");
+	phy_driver->crmu_usbphy_aon_ctrl_regs = devm_ioremap_resource(dev, res);
+	if (IS_ERR(phy_driver->crmu_usbphy_aon_ctrl_regs))
+		return PTR_ERR(phy_driver->crmu_usbphy_aon_ctrl_regs);
+
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
+					   "cdru-usbphy");
+	phy_driver->cdru_usbphy_regs = devm_ioremap_resource(dev, res);
+	if (IS_ERR(phy_driver->cdru_usbphy_regs))
+		return PTR_ERR(phy_driver->cdru_usbphy_regs);
+
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "usb2h-idm");
+	phy_driver->usb2h_idm_regs = devm_ioremap_resource(dev, res);
+	if (IS_ERR(phy_driver->usb2h_idm_regs))
+		return PTR_ERR(phy_driver->usb2h_idm_regs);
+
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "usb2d-idm");
+	phy_driver->usb2d_idm_regs = devm_ioremap_resource(dev, res);
+	if (IS_ERR(phy_driver->usb2d_idm_regs))
+		return PTR_ERR(phy_driver->usb2d_idm_regs);
+
+	reg_val = readl(phy_driver->usb2d_idm_regs);
+	writel((reg_val | USB2D_IDM_IDM_IO_SS_CLEAR_NAK_NEMPTY_EN_I),
+		   phy_driver->usb2d_idm_regs);
+	phy_driver->idm_host_enabled = false;
+
+	/* Shutdown all ports. They can be powered up as required */
+	cygnus_phy_shutdown_all(phy_driver);
+
+	phy_provider = devm_of_phy_provider_register(dev, cygnus_phy_xlate);
+	if (IS_ERR(phy_provider)) {
+		dev_err(dev, "Failed to register as phy provider\n");
+		ret = PTR_ERR(phy_provider);
+		return ret;
+	}
+
+	for (i = 0; i < phy_driver->num_phys; i++) {
+		if (phy_driver->instances[i].port == DUAL_ROLE_PHY) {
+			ret = cygnus_register_extcon_notifiers(
+				&phy_driver->instances[DUAL_ROLE_PHY]);
+			if (ret) {
+				dev_err(dev, "Failed to register notifier\n");
+				return ret;
+			}
+		}
+	}
+
+	return 0;
+}
+
+static const struct of_device_id cygnus_phy_dt_ids[] = {
+	{ .compatible = "brcm,cygnus-usb-phy", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, cygnus_phy_dt_ids);
+
+static struct platform_driver cygnus_phy_driver = {
+	.probe = cygnus_phy_probe,
+	.driver = {
+		.name = "bcm-cygnus-usbphy",
+		.of_match_table = of_match_ptr(cygnus_phy_dt_ids),
+	},
+};
+module_platform_driver(cygnus_phy_driver);
+
+MODULE_ALIAS("platform:bcm-cygnus-usbphy");
+MODULE_AUTHOR("Raveendra Padasalagi <Raveendra.padasalagi@broadcom.com");
+MODULE_DESCRIPTION("Broadcom Cygnus USB PHY driver");
+MODULE_LICENSE("GPL v2");
-- 
1.9.1


From 1583574480326298347@xxx Thu Nov 09 07:58:30 +0000 2017
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