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Message-ID: <CAAFb_vrE=hg2aRvyAv=KCQaoVYqi0EszQ3NsmmRX+xKypVmiUg@mail.gmail.com>
Date: Wed, 8 Nov 2017 13:22:32 +0530
From: Raveendra Padasalagi <raveendra.padasalagi@...adcom.com>
To: Rob Herring <robh+dt@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Kishon Vijay Abraham I <kishon@...com>,
Russell King <linux@...linux.org.uk>,
Scott Branden <sbranden@...adcom.com>,
Ray Jui <rjui@...adcom.com>,
Srinath Mannam <srinath.mannam@...adcom.com>,
Vikram Prakash <vikram.prakash@...adcom.com>,
Jon Mason <jonmason@...adcom.com>,
Florian Fainelli <f.fainelli@...il.com>,
Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
Raviteja Garimella <raviteja.garimella@...adcom.com>,
Rafal Milecki <rafal@...ecki.pl>,
Arnd Bergmann <arnd@...db.de>,
Viresh Kumar <viresh.kumar@...aro.org>,
Jaehoon Chung <jh80.chung@...sung.com>,
Chanwoo Choi <cw00.choi@...sung.com>
Cc: devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-kernel@...r.kernel.org,
bcm-kernel-feedback-list <bcm-kernel-feedback-list@...adcom.com>,
Raveendra Padasalagi <raveendra.padasalagi@...adcom.com>
Subject: Re: [PATCH v2 2/3] drivers: phy: broadcom: Add driver for Cygnus USB
phy controller
Hi,
Adding Chanwoo Choi to review extcon API's.
-Raveendra
On Wed, Nov 8, 2017 at 1:16 PM, Raveendra Padasalagi
<raveendra.padasalagi@...adcom.com> wrote:
> 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@...adcom.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@...adcom.com");
> +MODULE_DESCRIPTION("Broadcom Cygnus USB PHY driver");
> +MODULE_LICENSE("GPL v2");
> --
> 1.9.1
>
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