[PATCH v2 2/3] drivers: phy: broadcom: Add driver for Cygnus USB phy controller
Raveendra Padasalagi
raveendra.padasalagi at broadcom.com
Tue Nov 7 23:46:42 PST 2017
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 at 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 at broadcom.com");
+MODULE_DESCRIPTION("Broadcom Cygnus USB PHY driver");
+MODULE_LICENSE("GPL v2");
--
1.9.1
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