// SPDX-License-Identifier: GPL-2.0-only
// Copyright (C) 2017 Broadcom
#include <linux/delay.h>
#include <linux/extcon-provider.h>
#include <linux/gpio.h>
#include <linux/gpio/consumer.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/iopoll.h>
#include <linux/irq.h>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/phy/phy.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#include <linux/workqueue.h>
#define ICFG_DRD_AFE 0x0
#define ICFG_MISC_STAT 0x18
#define ICFG_DRD_P0CTL 0x1C
#define ICFG_STRAP_CTRL 0x20
#define ICFG_FSM_CTRL 0x24
#define ICFG_DEV_BIT BIT(2)
#define IDM_RST_BIT BIT(0)
#define AFE_CORERDY_VDDC BIT(18)
#define PHY_PLL_RESETB BIT(15)
#define PHY_RESETB BIT(14)
#define PHY_PLL_LOCK BIT(0)
#define DRD_DEV_MODE BIT(20)
#define OHCI_OVRCUR_POL BIT(11)
#define ICFG_OFF_MODE BIT(6)
#define PLL_LOCK_RETRY 1000
#define EVT_DEVICE 0
#define EVT_HOST 1
#define DRD_HOST_MODE (BIT(2) | BIT(3))
#define DRD_DEVICE_MODE (BIT(4) | BIT(5))
#define DRD_HOST_VAL 0x803
#define DRD_DEV_VAL 0x807
#define GPIO_DELAY 20
struct ns2_phy_data;
struct ns2_phy_driver {
void __iomem *icfgdrd_regs;
void __iomem *idmdrd_rst_ctrl;
void __iomem *crmu_usb2_ctrl;
void __iomem *usb2h_strap_reg;
struct ns2_phy_data *data;
struct extcon_dev *edev;
struct gpio_desc *vbus_gpiod;
struct gpio_desc *id_gpiod;
int id_irq;
int vbus_irq;
unsigned long debounce_jiffies;
struct delayed_work wq_extcon;
};
struct ns2_phy_data {
struct ns2_phy_driver *driver;
struct phy *phy;
int new_state;
};
static const unsigned int usb_extcon_cable[] = {
EXTCON_USB,
EXTCON_USB_HOST,
EXTCON_NONE,
};
static inline int pll_lock_stat(u32 usb_reg, int reg_mask,
struct ns2_phy_driver *driver)
{
u32 val;
return readl_poll_timeout_atomic(driver->icfgdrd_regs + usb_reg,
val, (val & reg_mask), 1,
PLL_LOCK_RETRY);
}
static int ns2_drd_phy_init(struct phy *phy)
{
struct ns2_phy_data *data = phy_get_drvdata(phy);
struct ns2_phy_driver *driver = data->driver;
u32 val;
val = readl(driver->icfgdrd_regs + ICFG_FSM_CTRL);
if (data->new_state == EVT_HOST) {
val &= ~DRD_DEVICE_MODE;
val |= DRD_HOST_MODE;
} else {
val &= ~DRD_HOST_MODE;
val |= DRD_DEVICE_MODE;
}
writel(val, driver->icfgdrd_regs + ICFG_FSM_CTRL);
return 0;
}
static int ns2_drd_phy_poweroff(struct phy *phy)
{
struct ns2_phy_data *data = phy_get_drvdata(phy);
struct ns2_phy_driver *driver = data->driver;
u32 val;
val = readl(driver->crmu_usb2_ctrl);
val &= ~AFE_CORERDY_VDDC;
writel(val, driver->crmu_usb2_ctrl);
val = readl(driver->crmu_usb2_ctrl);
val &= ~DRD_DEV_MODE;
writel(val, driver->crmu_usb2_ctrl);
/* Disable Host and Device Mode */
val = readl(driver->icfgdrd_regs + ICFG_FSM_CTRL);
val &= ~(DRD_HOST_MODE | DRD_DEVICE_MODE | ICFG_OFF_MODE);
writel(val, driver->icfgdrd_regs + ICFG_FSM_CTRL);
return 0;
}
static int ns2_drd_phy_poweron(struct phy *phy)
{
struct ns2_phy_data *data = phy_get_drvdata(phy);
struct ns2_phy_driver *driver = data->driver;
u32 extcon_event = data->new_state;
int ret;
u32 val;
if (extcon_event == EVT_DEVICE) {
writel(DRD_DEV_VAL, driver->icfgdrd_regs + ICFG_DRD_P0CTL);
val = readl(driver->idmdrd_rst_ctrl);
val &= ~IDM_RST_BIT;
writel(val, driver->idmdrd_rst_ctrl);
val = readl(driver->crmu_usb2_ctrl);
val |= (AFE_CORERDY_VDDC | DRD_DEV_MODE);
writel(val, driver->crmu_usb2_ctrl);
/* Bring PHY and PHY_PLL out of Reset */
val = readl(driver->crmu_usb2_ctrl);
val |= (PHY_PLL_RESETB | PHY_RESETB);
writel(val, driver->crmu_usb2_ctrl);
ret = pll_lock_stat(ICFG_MISC_STAT, PHY_PLL_LOCK, driver);
if (ret < 0) {
dev_err(&phy->dev, "Phy PLL lock failed\n");
return ret;
}
} else {
writel(DRD_HOST_VAL, driver->icfgdrd_regs + ICFG_DRD_P0CTL);
val = readl(driver->crmu_usb2_ctrl);
val |= AFE_CORERDY_VDDC;
writel(val, driver->crmu_usb2_ctrl);
ret = pll_lock_stat(ICFG_MISC_STAT, PHY_PLL_LOCK, driver);
if (ret < 0) {
dev_err(&phy->dev, "Phy PLL lock failed\n");
return ret;
}
val = readl(driver->idmdrd_rst_ctrl);
val &= ~IDM_RST_BIT;
writel(val, driver->idmdrd_rst_ctrl);
/* port over current Polarity */
val = readl(driver->usb2h_strap_reg);
val |= OHCI_OVRCUR_POL;
writel(val, driver->usb2h_strap_reg);
}
return 0;
}
static void connect_change(struct ns2_phy_driver *driver)
{
u32 extcon_event;
u32 val;
extcon_event = driver->data->new_state;
val = readl(driver->icfgdrd_regs + ICFG_FSM_CTRL);
switch (extcon_event) {
case EVT_DEVICE:
val &= ~(DRD_HOST_MODE | DRD_DEVICE_MODE);
writel(val, driver->icfgdrd_regs + ICFG_FSM_CTRL);
val = (val & ~DRD_HOST_MODE) | DRD_DEVICE_MODE;
writel(val, driver->icfgdrd_regs + ICFG_FSM_CTRL);
val = readl(driver->icfgdrd_regs + ICFG_DRD_P0CTL);
val |= ICFG_DEV_BIT;
writel(val, driver->icfgdrd_regs + ICFG_DRD_P0CTL);
break;
case EVT_HOST:
val &= ~(DRD_HOST_MODE | DRD_DEVICE_MODE);
writel(val, driver->icfgdrd_regs + ICFG_FSM_CTRL);
val = (val & ~DRD_DEVICE_MODE) | DRD_HOST_MODE;
writel(val, driver->icfgdrd_regs + ICFG_FSM_CTRL);
val = readl(driver->usb2h_strap_reg);
val |= OHCI_OVRCUR_POL;
writel(val, driver->usb2h_strap_reg);
val = readl(driver->icfgdrd_regs + ICFG_DRD_P0CTL);
val &= ~ICFG_DEV_BIT;
writel(val, driver->icfgdrd_regs + ICFG_DRD_P0CTL);
break;
default:
pr_err("Invalid extcon event\n");
break;
}
}
static void extcon_work(struct work_struct *work)
{
struct ns2_phy_driver *driver;
int vbus;
int id;
driver = container_of(to_delayed_work(work),
struct ns2_phy_driver, wq_extcon);
id = gpiod_get_value_cansleep(driver->id_gpiod);
vbus = gpiod_get_value_cansleep(driver->vbus_gpiod);
if (!id && vbus) { /* Host connected */
extcon_set_state_sync(driver->edev, EXTCON_USB_HOST, true);
pr_debug("Host cable connected\n");
driver->data->new_state = EVT_HOST;
connect_change(driver);
} else if (id && !vbus) { /* Disconnected */
extcon_set_state_sync(driver->edev, EXTCON_USB_HOST, false);
extcon_set_state_sync(driver->edev, EXTCON_USB, false);
pr_debug("Cable disconnected\n");
} else if (id && vbus) { /* Device connected */
extcon_set_state_sync(driver->edev, EXTCON_USB, true);
pr_debug("Device cable connected\n");
driver->data->new_state = EVT_DEVICE;
connect_change(driver);
}
}
static irqreturn_t gpio_irq_handler(int irq, void *dev_id)
{
struct ns2_phy_driver *driver = dev_id;
queue_delayed_work(system_power_efficient_wq, &driver->wq_extcon,
driver->debounce_jiffies);
return IRQ_HANDLED;
}
static const struct phy_ops ops = {
.init = ns2_drd_phy_init,
.power_on = ns2_drd_phy_poweron,
.power_off = ns2_drd_phy_poweroff,
.owner = THIS_MODULE,
};
static const struct of_device_id ns2_drd_phy_dt_ids[] = {
{ .compatible = "brcm,ns2-drd-phy", },
{ }
};
MODULE_DEVICE_TABLE(of, ns2_drd_phy_dt_ids);
static int ns2_drd_phy_probe(struct platform_device *pdev)
{
struct phy_provider *phy_provider;
struct device *dev = &pdev->dev;
struct ns2_phy_driver *driver;
struct ns2_phy_data *data;
int ret;
u32 val;
driver = devm_kzalloc(dev, sizeof(struct ns2_phy_driver),
GFP_KERNEL);
if (!driver)
return -ENOMEM;
driver->data = devm_kzalloc(dev, sizeof(struct ns2_phy_data),
GFP_KERNEL);
if (!driver->data)
return -ENOMEM;
driver->icfgdrd_regs = devm_platform_ioremap_resource_byname(pdev, "icfg");
if (IS_ERR(driver->icfgdrd_regs))
return PTR_ERR(driver->icfgdrd_regs);
driver->idmdrd_rst_ctrl = devm_platform_ioremap_resource_byname(pdev, "rst-ctrl");
if (IS_ERR(driver->idmdrd_rst_ctrl))
return PTR_ERR(driver->idmdrd_rst_ctrl);
driver->crmu_usb2_ctrl = devm_platform_ioremap_resource_byname(pdev, "crmu-ctrl");
if (IS_ERR(driver->crmu_usb2_ctrl))
return PTR_ERR(driver->crmu_usb2_ctrl);
driver->usb2h_strap_reg = devm_platform_ioremap_resource_byname(pdev, "usb2-strap");
if (IS_ERR(driver->usb2h_strap_reg))
return PTR_ERR(driver->usb2h_strap_reg);
/* create extcon */
driver->id_gpiod = devm_gpiod_get(&pdev->dev, "id", GPIOD_IN);
if (IS_ERR(driver->id_gpiod)) {
dev_err(dev, "failed to get ID GPIO\n");
return PTR_ERR(driver->id_gpiod);
}
driver->vbus_gpiod = devm_gpiod_get(&pdev->dev, "vbus", GPIOD_IN);
if (IS_ERR(driver->vbus_gpiod)) {
dev_err(dev, "failed to get VBUS GPIO\n");
return PTR_ERR(driver->vbus_gpiod);
}
driver->edev = devm_extcon_dev_allocate(dev, usb_extcon_cable);
if (IS_ERR(driver->edev)) {
dev_err(dev, "failed to allocate extcon device\n");
return -ENOMEM;
}
ret = devm_extcon_dev_register(dev, driver->edev);
if (ret < 0) {
dev_err(dev, "failed to register extcon device\n");
return ret;
}
ret = gpiod_set_debounce(driver->id_gpiod, GPIO_DELAY * 1000);
if (ret < 0)
driver->debounce_jiffies = msecs_to_jiffies(GPIO_DELAY);
INIT_DELAYED_WORK(&driver->wq_extcon, extcon_work);
driver->id_irq = gpiod_to_irq(driver->id_gpiod);
if (driver->id_irq < 0) {
dev_err(dev, "failed to get ID IRQ\n");
return driver->id_irq;
}
driver->vbus_irq = gpiod_to_irq(driver->vbus_gpiod);
if (driver->vbus_irq < 0) {
dev_err(dev, "failed to get ID IRQ\n");
return driver->vbus_irq;
}
ret = devm_request_irq(dev, driver->id_irq, gpio_irq_handler,
IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
"usb_id", driver);
if (ret < 0) {
dev_err(dev, "failed to request handler for ID IRQ\n");
return ret;
}
ret = devm_request_irq(dev, driver->vbus_irq, gpio_irq_handler,
IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
"usb_vbus", driver);
if (ret < 0) {
dev_err(dev, "failed to request handler for VBUS IRQ\n");
return ret;
}
dev_set_drvdata(dev, driver);
/* Shutdown all ports. They can be powered up as required */
val = readl(driver->crmu_usb2_ctrl);
val &= ~(AFE_CORERDY_VDDC | PHY_RESETB);
writel(val, driver->crmu_usb2_ctrl);
data = driver->data;
data->phy = devm_phy_create(dev, dev->of_node, &ops);
if (IS_ERR(data->phy)) {
dev_err(dev, "Failed to create usb drd phy\n");
return PTR_ERR(data->phy);
}
data->driver = driver;
phy_set_drvdata(data->phy, data);
phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
if (IS_ERR(phy_provider)) {
dev_err(dev, "Failed to register as phy provider\n");
return PTR_ERR(phy_provider);
}
platform_set_drvdata(pdev, driver);
dev_info(dev, "Registered NS2 DRD Phy device\n");
queue_delayed_work(system_power_efficient_wq, &driver->wq_extcon,
driver->debounce_jiffies);
return 0;
}
static struct platform_driver ns2_drd_phy_driver = {
.probe = ns2_drd_phy_probe,
.driver = {
.name = "bcm-ns2-usbphy",
.of_match_table = of_match_ptr(ns2_drd_phy_dt_ids),
},
};
module_platform_driver(ns2_drd_phy_driver);
MODULE_ALIAS("platform:bcm-ns2-drd-phy");
MODULE_AUTHOR("Broadcom");
MODULE_DESCRIPTION("Broadcom NS2 USB2 PHY driver");
MODULE_LICENSE("GPL v2");
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