blob: b60b5f7b6dff469b4376080a31c7061b7102b2b6 [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0
/*
* drd.c - DesignWare USB3 DRD Controller Dual-role support
*
* Copyright (C) 2017 Texas Instruments Incorporated - https://www.ti.com
*
* Authors: Roger Quadros <rogerq@ti.com>
*/
#include <linux/extcon.h>
#include <linux/of_graph.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/property.h>
#include "debug.h"
#include "core.h"
#include "gadget.h"
static void dwc3_otg_disable_events(struct dwc3 *dwc, u32 disable_mask)
{
u32 reg = dwc3_readl(dwc->regs, DWC3_OEVTEN);
reg &= ~(disable_mask);
dwc3_writel(dwc->regs, DWC3_OEVTEN, reg);
}
static void dwc3_otg_enable_events(struct dwc3 *dwc, u32 enable_mask)
{
u32 reg = dwc3_readl(dwc->regs, DWC3_OEVTEN);
reg |= (enable_mask);
dwc3_writel(dwc->regs, DWC3_OEVTEN, reg);
}
static void dwc3_otg_clear_events(struct dwc3 *dwc)
{
u32 reg = dwc3_readl(dwc->regs, DWC3_OEVT);
dwc3_writel(dwc->regs, DWC3_OEVTEN, reg);
}
#define DWC3_OTG_ALL_EVENTS (DWC3_OEVTEN_XHCIRUNSTPSETEN | \
DWC3_OEVTEN_DEVRUNSTPSETEN | DWC3_OEVTEN_HIBENTRYEN | \
DWC3_OEVTEN_CONIDSTSCHNGEN | DWC3_OEVTEN_HRRCONFNOTIFEN | \
DWC3_OEVTEN_HRRINITNOTIFEN | DWC3_OEVTEN_ADEVIDLEEN | \
DWC3_OEVTEN_ADEVBHOSTENDEN | DWC3_OEVTEN_ADEVHOSTEN | \
DWC3_OEVTEN_ADEVHNPCHNGEN | DWC3_OEVTEN_ADEVSRPDETEN | \
DWC3_OEVTEN_ADEVSESSENDDETEN | DWC3_OEVTEN_BDEVBHOSTENDEN | \
DWC3_OEVTEN_BDEVHNPCHNGEN | DWC3_OEVTEN_BDEVSESSVLDDETEN | \
DWC3_OEVTEN_BDEVVBUSCHNGEN)
static irqreturn_t dwc3_otg_thread_irq(int irq, void *_dwc)
{
struct dwc3 *dwc = _dwc;
spin_lock(&dwc->lock);
if (dwc->otg_restart_host) {
dwc3_otg_host_init(dwc);
dwc->otg_restart_host = false;
}
spin_unlock(&dwc->lock);
dwc3_set_mode(dwc, DWC3_GCTL_PRTCAP_OTG);
return IRQ_HANDLED;
}
static irqreturn_t dwc3_otg_irq(int irq, void *_dwc)
{
u32 reg;
struct dwc3 *dwc = _dwc;
irqreturn_t ret = IRQ_NONE;
reg = dwc3_readl(dwc->regs, DWC3_OEVT);
if (reg) {
/* ignore non OTG events, we can't disable them in OEVTEN */
if (!(reg & DWC3_OTG_ALL_EVENTS)) {
dwc3_writel(dwc->regs, DWC3_OEVT, reg);
return IRQ_NONE;
}
if (dwc->current_otg_role == DWC3_OTG_ROLE_HOST &&
!(reg & DWC3_OEVT_DEVICEMODE))
dwc->otg_restart_host = true;
dwc3_writel(dwc->regs, DWC3_OEVT, reg);
ret = IRQ_WAKE_THREAD;
}
return ret;
}
static void dwc3_otgregs_init(struct dwc3 *dwc)
{
u32 reg;
/*
* Prevent host/device reset from resetting OTG core.
* If we don't do this then xhci_reset (USBCMD.HCRST) will reset
* the signal outputs sent to the PHY, the OTG FSM logic of the
* core and also the resets to the VBUS filters inside the core.
*/
reg = dwc3_readl(dwc->regs, DWC3_OCFG);
reg |= DWC3_OCFG_SFTRSTMASK;
dwc3_writel(dwc->regs, DWC3_OCFG, reg);
/* Disable hibernation for simplicity */
reg = dwc3_readl(dwc->regs, DWC3_GCTL);
reg &= ~DWC3_GCTL_GBLHIBERNATIONEN;
dwc3_writel(dwc->regs, DWC3_GCTL, reg);
/*
* Initialize OTG registers as per
* Figure 11-4 OTG Driver Overall Programming Flow
*/
/* OCFG.SRPCap = 0, OCFG.HNPCap = 0 */
reg = dwc3_readl(dwc->regs, DWC3_OCFG);
reg &= ~(DWC3_OCFG_SRPCAP | DWC3_OCFG_HNPCAP);
dwc3_writel(dwc->regs, DWC3_OCFG, reg);
/* OEVT = FFFF */
dwc3_otg_clear_events(dwc);
/* OEVTEN = 0 */
dwc3_otg_disable_events(dwc, DWC3_OTG_ALL_EVENTS);
/* OEVTEN.ConIDStsChngEn = 1. Instead we enable all events */
dwc3_otg_enable_events(dwc, DWC3_OTG_ALL_EVENTS);
/*
* OCTL.PeriMode = 1, OCTL.DevSetHNPEn = 0, OCTL.HstSetHNPEn = 0,
* OCTL.HNPReq = 0
*/
reg = dwc3_readl(dwc->regs, DWC3_OCTL);
reg |= DWC3_OCTL_PERIMODE;
reg &= ~(DWC3_OCTL_DEVSETHNPEN | DWC3_OCTL_HSTSETHNPEN |
DWC3_OCTL_HNPREQ);
dwc3_writel(dwc->regs, DWC3_OCTL, reg);
}
static int dwc3_otg_get_irq(struct dwc3 *dwc)
{
struct platform_device *dwc3_pdev = to_platform_device(dwc->dev);
int irq;
irq = platform_get_irq_byname_optional(dwc3_pdev, "otg");
if (irq > 0)
goto out;
if (irq == -EPROBE_DEFER)
goto out;
irq = platform_get_irq_byname_optional(dwc3_pdev, "dwc_usb3");
if (irq > 0)
goto out;
if (irq == -EPROBE_DEFER)
goto out;
irq = platform_get_irq(dwc3_pdev, 0);
if (irq > 0)
goto out;
if (!irq)
irq = -EINVAL;
out:
return irq;
}
void dwc3_otg_init(struct dwc3 *dwc)
{
u32 reg;
/*
* As per Figure 11-4 OTG Driver Overall Programming Flow,
* block "Initialize GCTL for OTG operation".
*/
/* GCTL.PrtCapDir=2'b11 */
dwc3_set_prtcap(dwc, DWC3_GCTL_PRTCAP_OTG);
/* GUSB2PHYCFG0.SusPHY=0 */
reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));
reg &= ~DWC3_GUSB2PHYCFG_SUSPHY;
dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
/* Initialize OTG registers */
dwc3_otgregs_init(dwc);
}
void dwc3_otg_exit(struct dwc3 *dwc)
{
/* disable all OTG IRQs */
dwc3_otg_disable_events(dwc, DWC3_OTG_ALL_EVENTS);
/* clear all events */
dwc3_otg_clear_events(dwc);
}
/* should be called before Host controller driver is started */
void dwc3_otg_host_init(struct dwc3 *dwc)
{
u32 reg;
/* As per Figure 11-10 A-Device Flow Diagram */
/* OCFG.HNPCap = 0, OCFG.SRPCap = 0. Already 0 */
/*
* OCTL.PeriMode=0, OCTL.TermSelDLPulse = 0,
* OCTL.DevSetHNPEn = 0, OCTL.HstSetHNPEn = 0
*/
reg = dwc3_readl(dwc->regs, DWC3_OCTL);
reg &= ~(DWC3_OCTL_PERIMODE | DWC3_OCTL_TERMSELIDPULSE |
DWC3_OCTL_DEVSETHNPEN | DWC3_OCTL_HSTSETHNPEN);
dwc3_writel(dwc->regs, DWC3_OCTL, reg);
/*
* OCFG.DisPrtPwrCutoff = 0/1
*/
reg = dwc3_readl(dwc->regs, DWC3_OCFG);
reg &= ~DWC3_OCFG_DISPWRCUTTOFF;
dwc3_writel(dwc->regs, DWC3_OCFG, reg);
/*
* OCFG.SRPCap = 1, OCFG.HNPCap = GHWPARAMS6.HNP_CAP
* We don't want SRP/HNP for simple dual-role so leave
* these disabled.
*/
/*
* OEVTEN.OTGADevHostEvntEn = 1
* OEVTEN.OTGADevSessEndDetEvntEn = 1
* We don't want HNP/role-swap so leave these disabled.
*/
/* GUSB2PHYCFG.ULPIAutoRes = 1/0, GUSB2PHYCFG.SusPHY = 1 */
if (!dwc->dis_u2_susphy_quirk) {
reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));
reg |= DWC3_GUSB2PHYCFG_SUSPHY;
dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
}
/* Set Port Power to enable VBUS: OCTL.PrtPwrCtl = 1 */
reg = dwc3_readl(dwc->regs, DWC3_OCTL);
reg |= DWC3_OCTL_PRTPWRCTL;
dwc3_writel(dwc->regs, DWC3_OCTL, reg);
}
/* should be called after Host controller driver is stopped */
static void dwc3_otg_host_exit(struct dwc3 *dwc)
{
u32 reg;
/*
* Exit from A-device flow as per
* Figure 11-4 OTG Driver Overall Programming Flow
*/
/*
* OEVTEN.OTGADevBHostEndEvntEn=0, OEVTEN.OTGADevHNPChngEvntEn=0
* OEVTEN.OTGADevSessEndDetEvntEn=0,
* OEVTEN.OTGADevHostEvntEn = 0
* But we don't disable any OTG events
*/
/* OCTL.HstSetHNPEn = 0, OCTL.PrtPwrCtl=0 */
reg = dwc3_readl(dwc->regs, DWC3_OCTL);
reg &= ~(DWC3_OCTL_HSTSETHNPEN | DWC3_OCTL_PRTPWRCTL);
dwc3_writel(dwc->regs, DWC3_OCTL, reg);
}
/* should be called before the gadget controller driver is started */
static void dwc3_otg_device_init(struct dwc3 *dwc)
{
u32 reg;
/* As per Figure 11-20 B-Device Flow Diagram */
/*
* OCFG.HNPCap = GHWPARAMS6.HNP_CAP, OCFG.SRPCap = 1
* but we keep them 0 for simple dual-role operation.
*/
reg = dwc3_readl(dwc->regs, DWC3_OCFG);
/* OCFG.OTGSftRstMsk = 0/1 */
reg |= DWC3_OCFG_SFTRSTMASK;
dwc3_writel(dwc->regs, DWC3_OCFG, reg);
/*
* OCTL.PeriMode = 1
* OCTL.TermSelDLPulse = 0/1, OCTL.HNPReq = 0
* OCTL.DevSetHNPEn = 0, OCTL.HstSetHNPEn = 0
*/
reg = dwc3_readl(dwc->regs, DWC3_OCTL);
reg |= DWC3_OCTL_PERIMODE;
reg &= ~(DWC3_OCTL_TERMSELIDPULSE | DWC3_OCTL_HNPREQ |
DWC3_OCTL_DEVSETHNPEN | DWC3_OCTL_HSTSETHNPEN);
dwc3_writel(dwc->regs, DWC3_OCTL, reg);
/* OEVTEN.OTGBDevSesVldDetEvntEn = 1 */
dwc3_otg_enable_events(dwc, DWC3_OEVTEN_BDEVSESSVLDDETEN);
/* GUSB2PHYCFG.ULPIAutoRes = 0, GUSB2PHYCFG0.SusPHY = 1 */
if (!dwc->dis_u2_susphy_quirk) {
reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));
reg |= DWC3_GUSB2PHYCFG_SUSPHY;
dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
}
/* GCTL.GblHibernationEn = 0. Already 0. */
}
/* should be called after the gadget controller driver is stopped */
static void dwc3_otg_device_exit(struct dwc3 *dwc)
{
u32 reg;
/*
* Exit from B-device flow as per
* Figure 11-4 OTG Driver Overall Programming Flow
*/
/*
* OEVTEN.OTGBDevHNPChngEvntEn = 0
* OEVTEN.OTGBDevVBusChngEvntEn = 0
* OEVTEN.OTGBDevBHostEndEvntEn = 0
*/
dwc3_otg_disable_events(dwc, DWC3_OEVTEN_BDEVHNPCHNGEN |
DWC3_OEVTEN_BDEVVBUSCHNGEN |
DWC3_OEVTEN_BDEVBHOSTENDEN);
/* OCTL.DevSetHNPEn = 0, OCTL.HNPReq = 0, OCTL.PeriMode=1 */
reg = dwc3_readl(dwc->regs, DWC3_OCTL);
reg &= ~(DWC3_OCTL_DEVSETHNPEN | DWC3_OCTL_HNPREQ);
reg |= DWC3_OCTL_PERIMODE;
dwc3_writel(dwc->regs, DWC3_OCTL, reg);
}
void dwc3_otg_update(struct dwc3 *dwc, bool ignore_idstatus)
{
int ret;
u32 reg;
int id;
unsigned long flags;
if (dwc->dr_mode != USB_DR_MODE_OTG)
return;
/* don't do anything if debug user changed role to not OTG */
if (dwc->current_dr_role != DWC3_GCTL_PRTCAP_OTG)
return;
if (!ignore_idstatus) {
reg = dwc3_readl(dwc->regs, DWC3_OSTS);
id = !!(reg & DWC3_OSTS_CONIDSTS);
dwc->desired_otg_role = id ? DWC3_OTG_ROLE_DEVICE :
DWC3_OTG_ROLE_HOST;
}
if (dwc->desired_otg_role == dwc->current_otg_role)
return;
switch (dwc->current_otg_role) {
case DWC3_OTG_ROLE_HOST:
dwc3_host_exit(dwc);
spin_lock_irqsave(&dwc->lock, flags);
dwc3_otg_host_exit(dwc);
spin_unlock_irqrestore(&dwc->lock, flags);
break;
case DWC3_OTG_ROLE_DEVICE:
dwc3_gadget_exit(dwc);
spin_lock_irqsave(&dwc->lock, flags);
dwc3_event_buffers_cleanup(dwc);
dwc3_otg_device_exit(dwc);
spin_unlock_irqrestore(&dwc->lock, flags);
break;
default:
break;
}
spin_lock_irqsave(&dwc->lock, flags);
dwc->current_otg_role = dwc->desired_otg_role;
spin_unlock_irqrestore(&dwc->lock, flags);
switch (dwc->desired_otg_role) {
case DWC3_OTG_ROLE_HOST:
spin_lock_irqsave(&dwc->lock, flags);
dwc3_otgregs_init(dwc);
dwc3_otg_host_init(dwc);
spin_unlock_irqrestore(&dwc->lock, flags);
ret = dwc3_host_init(dwc);
if (ret) {
dev_err(dwc->dev, "failed to initialize host\n");
} else {
if (dwc->usb2_phy)
otg_set_vbus(dwc->usb2_phy->otg, true);
if (dwc->usb2_generic_phy)
phy_set_mode(dwc->usb2_generic_phy,
PHY_MODE_USB_HOST);
}
break;
case DWC3_OTG_ROLE_DEVICE:
spin_lock_irqsave(&dwc->lock, flags);
dwc3_otgregs_init(dwc);
dwc3_otg_device_init(dwc);
dwc3_event_buffers_setup(dwc);
spin_unlock_irqrestore(&dwc->lock, flags);
if (dwc->usb2_phy)
otg_set_vbus(dwc->usb2_phy->otg, false);
if (dwc->usb2_generic_phy)
phy_set_mode(dwc->usb2_generic_phy,
PHY_MODE_USB_DEVICE);
ret = dwc3_gadget_init(dwc);
if (ret)
dev_err(dwc->dev, "failed to initialize peripheral\n");
break;
default:
break;
}
}
static void dwc3_drd_update(struct dwc3 *dwc)
{
int id;
if (dwc->edev) {
id = extcon_get_state(dwc->edev, EXTCON_USB_HOST);
if (id < 0)
id = 0;
dwc3_set_mode(dwc, id ?
DWC3_GCTL_PRTCAP_HOST :
DWC3_GCTL_PRTCAP_DEVICE);
}
}
static int dwc3_drd_notifier(struct notifier_block *nb,
unsigned long event, void *ptr)
{
struct dwc3 *dwc = container_of(nb, struct dwc3, edev_nb);
dwc3_set_mode(dwc, event ?
DWC3_GCTL_PRTCAP_HOST :
DWC3_GCTL_PRTCAP_DEVICE);
return NOTIFY_DONE;
}
static struct extcon_dev *dwc3_get_extcon(struct dwc3 *dwc)
{
struct device *dev = dwc->dev;
struct device_node *np_phy;
struct extcon_dev *edev = NULL;
const char *name;
if (device_property_read_bool(dev, "extcon"))
return extcon_get_edev_by_phandle(dev, 0);
/*
* Device tree platforms should get extcon via phandle.
* On ACPI platforms, we get the name from a device property.
* This device property is for kernel internal use only and
* is expected to be set by the glue code.
*/
if (device_property_read_string(dev, "linux,extcon-name", &name) == 0) {
edev = extcon_get_extcon_dev(name);
if (!edev)
return ERR_PTR(-EPROBE_DEFER);
return edev;
}
/*
* Try to get an extcon device from the USB PHY controller's "port"
* node. Check if it has the "port" node first, to avoid printing the
* error message from underlying code, as it's a valid case: extcon
* device (and "port" node) may be missing in case of "usb-role-switch"
* or OTG mode.
*/
np_phy = of_parse_phandle(dev->of_node, "phys", 0);
if (of_graph_is_present(np_phy)) {
struct device_node *np_conn;
np_conn = of_graph_get_remote_node(np_phy, -1, -1);
if (np_conn)
edev = extcon_find_edev_by_node(np_conn);
of_node_put(np_conn);
}
of_node_put(np_phy);
return edev;
}
#if IS_ENABLED(CONFIG_USB_ROLE_SWITCH)
#define ROLE_SWITCH 1
static int dwc3_usb_role_switch_set(struct usb_role_switch *sw,
enum usb_role role)
{
struct dwc3 *dwc = usb_role_switch_get_drvdata(sw);
u32 mode;
switch (role) {
case USB_ROLE_HOST:
mode = DWC3_GCTL_PRTCAP_HOST;
break;
case USB_ROLE_DEVICE:
mode = DWC3_GCTL_PRTCAP_DEVICE;
break;
default:
if (dwc->role_switch_default_mode == USB_DR_MODE_HOST)
mode = DWC3_GCTL_PRTCAP_HOST;
else
mode = DWC3_GCTL_PRTCAP_DEVICE;
break;
}
dwc3_set_mode(dwc, mode);
return 0;
}
static enum usb_role dwc3_usb_role_switch_get(struct usb_role_switch *sw)
{
struct dwc3 *dwc = usb_role_switch_get_drvdata(sw);
unsigned long flags;
enum usb_role role;
spin_lock_irqsave(&dwc->lock, flags);
switch (dwc->current_dr_role) {
case DWC3_GCTL_PRTCAP_HOST:
role = USB_ROLE_HOST;
break;
case DWC3_GCTL_PRTCAP_DEVICE:
role = USB_ROLE_DEVICE;
break;
case DWC3_GCTL_PRTCAP_OTG:
role = dwc->current_otg_role;
break;
default:
if (dwc->role_switch_default_mode == USB_DR_MODE_HOST)
role = USB_ROLE_HOST;
else
role = USB_ROLE_DEVICE;
break;
}
spin_unlock_irqrestore(&dwc->lock, flags);
return role;
}
static int dwc3_setup_role_switch(struct dwc3 *dwc)
{
struct usb_role_switch_desc dwc3_role_switch = {NULL};
u32 mode;
dwc->role_switch_default_mode = usb_get_role_switch_default_mode(dwc->dev);
if (dwc->role_switch_default_mode == USB_DR_MODE_HOST) {
mode = DWC3_GCTL_PRTCAP_HOST;
} else {
dwc->role_switch_default_mode = USB_DR_MODE_PERIPHERAL;
mode = DWC3_GCTL_PRTCAP_DEVICE;
}
dwc3_role_switch.fwnode = dev_fwnode(dwc->dev);
dwc3_role_switch.set = dwc3_usb_role_switch_set;
dwc3_role_switch.get = dwc3_usb_role_switch_get;
dwc3_role_switch.driver_data = dwc;
dwc->role_sw = usb_role_switch_register(dwc->dev, &dwc3_role_switch);
if (IS_ERR(dwc->role_sw))
return PTR_ERR(dwc->role_sw);
if (dwc->dev->of_node) {
/* populate connector entry */
int ret = devm_of_platform_populate(dwc->dev);
if (ret) {
usb_role_switch_unregister(dwc->role_sw);
dwc->role_sw = NULL;
dev_err(dwc->dev, "DWC3 platform devices creation failed: %i\n", ret);
return ret;
}
}
dwc3_set_mode(dwc, mode);
return 0;
}
#else
#define ROLE_SWITCH 0
#define dwc3_setup_role_switch(x) 0
#endif
int dwc3_drd_init(struct dwc3 *dwc)
{
int ret, irq;
dwc->edev = dwc3_get_extcon(dwc);
if (IS_ERR(dwc->edev))
return PTR_ERR(dwc->edev);
if (ROLE_SWITCH &&
device_property_read_bool(dwc->dev, "usb-role-switch")) {
ret = dwc3_setup_role_switch(dwc);
if (ret < 0)
return ret;
} else if (dwc->edev) {
dwc->edev_nb.notifier_call = dwc3_drd_notifier;
ret = extcon_register_notifier(dwc->edev, EXTCON_USB_HOST,
&dwc->edev_nb);
if (ret < 0) {
dev_err(dwc->dev, "couldn't register cable notifier\n");
return ret;
}
dwc3_drd_update(dwc);
} else {
dwc3_set_prtcap(dwc, DWC3_GCTL_PRTCAP_OTG);
/* use OTG block to get ID event */
irq = dwc3_otg_get_irq(dwc);
if (irq < 0)
return irq;
dwc->otg_irq = irq;
/* disable all OTG IRQs */
dwc3_otg_disable_events(dwc, DWC3_OTG_ALL_EVENTS);
/* clear all events */
dwc3_otg_clear_events(dwc);
ret = request_threaded_irq(dwc->otg_irq, dwc3_otg_irq,
dwc3_otg_thread_irq,
IRQF_SHARED, "dwc3-otg", dwc);
if (ret) {
dev_err(dwc->dev, "failed to request irq #%d --> %d\n",
dwc->otg_irq, ret);
ret = -ENODEV;
return ret;
}
dwc3_otg_init(dwc);
dwc3_set_mode(dwc, DWC3_GCTL_PRTCAP_OTG);
}
return 0;
}
void dwc3_drd_exit(struct dwc3 *dwc)
{
unsigned long flags;
if (dwc->role_sw)
usb_role_switch_unregister(dwc->role_sw);
if (dwc->edev)
extcon_unregister_notifier(dwc->edev, EXTCON_USB_HOST,
&dwc->edev_nb);
cancel_work_sync(&dwc->drd_work);
/* debug user might have changed role, clean based on current role */
switch (dwc->current_dr_role) {
case DWC3_GCTL_PRTCAP_HOST:
dwc3_host_exit(dwc);
break;
case DWC3_GCTL_PRTCAP_DEVICE:
dwc3_gadget_exit(dwc);
dwc3_event_buffers_cleanup(dwc);
break;
case DWC3_GCTL_PRTCAP_OTG:
dwc3_otg_exit(dwc);
spin_lock_irqsave(&dwc->lock, flags);
dwc->desired_otg_role = DWC3_OTG_ROLE_IDLE;
spin_unlock_irqrestore(&dwc->lock, flags);
dwc3_otg_update(dwc, 1);
break;
default:
break;
}
if (dwc->otg_irq)
free_irq(dwc->otg_irq, dwc);
}