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usb: dwc3: add dual role support using OTG block

Browse source 
This is useful on platforms (e.g. TI AM437x) that don't
have ID available on a GPIO but do have the OTG block.

We can obtain the ID state via the OTG block and use it
for dual-role switching.

Signed-off-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
This commit is contained in:
Roger Quadros 2018-02-27 13:30:19 +02:00 committed by Felipe Balbi
parent 43bcf64e5c
commit f09cc79b4b
3 changed files with 557 additions and 28 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

67
drivers/usb/dwc3/core.c
View file

@ -89,10 +89,7 @@ static int dwc3_get_dr_mode(struct dwc3 *dwc)
return 0;
}
static void dwc3_event_buffers_cleanup(struct dwc3 *dwc);
static int dwc3_event_buffers_setup(struct dwc3 *dwc);
static void dwc3_set_prtcap(struct dwc3 *dwc, u32 mode)
void dwc3_set_prtcap(struct dwc3 *dwc, u32 mode)
{
u32 reg;
@ -110,16 +107,19 @@ static void __dwc3_set_mode(struct work_struct *work)
unsigned long flags;
int ret;
if (dwc->dr_mode != USB_DR_MODE_OTG)
return;
if (dwc->current_dr_role == DWC3_GCTL_PRTCAP_OTG)
dwc3_otg_update(dwc, 0);
if (!dwc->desired_dr_role)
return;
if (dwc->desired_dr_role == dwc->current_dr_role)
return;
if (dwc->dr_mode != USB_DR_MODE_OTG)
return;
if (dwc->desired_dr_role == DWC3_GCTL_PRTCAP_OTG)
if (dwc->desired_dr_role == DWC3_GCTL_PRTCAP_OTG && dwc->edev)
return;
switch (dwc->current_dr_role) {
@ -130,6 +130,13 @@ static void __dwc3_set_mode(struct work_struct *work)
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;
}
@ -165,9 +172,14 @@ static void __dwc3_set_mode(struct work_struct *work)
if (ret)
dev_err(dwc->dev, "failed to initialize peripheral\n");
break;
case DWC3_GCTL_PRTCAP_OTG:
dwc3_otg_init(dwc);
dwc3_otg_update(dwc, 0);
break;
default:
break;
}
}
void dwc3_set_mode(struct dwc3 *dwc, u32 mode)
@ -351,7 +363,7 @@ static int dwc3_alloc_event_buffers(struct dwc3 *dwc, unsigned length)
*
* Returns 0 on success otherwise negative errno.
*/
static int dwc3_event_buffers_setup(struct dwc3 *dwc)
int dwc3_event_buffers_setup(struct dwc3 *dwc)
{
struct dwc3_event_buffer *evt;
@ -368,7 +380,7 @@ static int dwc3_event_buffers_setup(struct dwc3 *dwc)
return 0;
}
static void dwc3_event_buffers_cleanup(struct dwc3 *dwc)
void dwc3_event_buffers_cleanup(struct dwc3 *dwc)
{
struct dwc3_event_buffer *evt;
@ -1329,6 +1341,20 @@ static int dwc3_suspend_common(struct dwc3 *dwc, pm_message_t msg)
if (!PMSG_IS_AUTO(msg))
dwc3_core_exit(dwc);
break;
case DWC3_GCTL_PRTCAP_OTG:
/* do nothing during runtime_suspend */
if (PMSG_IS_AUTO(msg))
break;
if (dwc->current_otg_role == DWC3_OTG_ROLE_DEVICE) {
spin_lock_irqsave(&dwc->lock, flags);
dwc3_gadget_suspend(dwc);
spin_unlock_irqrestore(&dwc->lock, flags);
}
dwc3_otg_exit(dwc);
dwc3_core_exit(dwc);
break;
default:
/* do nothing */
break;
@ -1359,6 +1385,27 @@ static int dwc3_resume_common(struct dwc3 *dwc, pm_message_t msg)
if (ret)
return ret;
}
break;
case DWC3_GCTL_PRTCAP_OTG:
/* nothing to do on runtime_resume */
if (PMSG_IS_AUTO(msg))
break;
ret = dwc3_core_init(dwc);
if (ret)
return ret;
dwc3_set_prtcap(dwc, dwc->current_dr_role);
dwc3_otg_init(dwc);
if (dwc->current_otg_role == DWC3_OTG_ROLE_HOST) {
dwc3_otg_host_init(dwc);
} else if (dwc->current_otg_role == DWC3_OTG_ROLE_DEVICE) {
spin_lock_irqsave(&dwc->lock, flags);
dwc3_gadget_resume(dwc);
spin_unlock_irqrestore(&dwc->lock, flags);
}
break;
default:
/* do nothing */

29
drivers/usb/dwc3/core.h
View file

@ -58,6 +58,11 @@
#define DWC3_DEVICE_EVENT_CMD_CMPL 10
#define DWC3_DEVICE_EVENT_OVERFLOW 11
/* Controller's role while using the OTG block */
#define DWC3_OTG_ROLE_IDLE 0
#define DWC3_OTG_ROLE_HOST 1
#define DWC3_OTG_ROLE_DEVICE 2
#define DWC3_GEVNTCOUNT_MASK 0xfffc
#define DWC3_GEVNTCOUNT_EHB BIT(31)
#define DWC3_GSNPSID_MASK 0xffff0000
@ -863,6 +868,10 @@ struct dwc3_scratchpad_array {
* @regs_size: address space size
* @fladj: frame length adjustment
* @irq_gadget: peripheral controller's IRQ number
* @otg_irq: IRQ number for OTG IRQs
* @current_otg_role: current role of operation while using the OTG block
* @desired_otg_role: desired role of operation while using the OTG block
* @otg_restart_host: flag that OTG controller needs to restart host
* @nr_scratch: number of scratch buffers
* @u1u2: only used on revisions <1.83a for workaround
* @maximum_speed: maximum speed requested (mainly for testing purposes)
@ -996,6 +1005,10 @@ struct dwc3 {
u32 fladj;
u32 irq_gadget;
u32 otg_irq;
u32 current_otg_role;
u32 desired_otg_role;
bool otg_restart_host;
u32 nr_scratch;
u32 u1u2;
u32 maximum_speed;
@ -1257,6 +1270,7 @@ struct dwc3_gadget_ep_cmd_params {
#define DWC3_HAS_OTG BIT(3)
/* prototypes */
void dwc3_set_prtcap(struct dwc3 *dwc, u32 mode);
void dwc3_set_mode(struct dwc3 *dwc, u32 mode);
u32 dwc3_core_fifo_space(struct dwc3_ep *dep, u8 type);
@ -1274,6 +1288,9 @@ static inline bool dwc3_is_usb31(struct dwc3 *dwc)
bool dwc3_has_imod(struct dwc3 *dwc);
int dwc3_event_buffers_setup(struct dwc3 *dwc);
void dwc3_event_buffers_cleanup(struct dwc3 *dwc);
#if IS_ENABLED(CONFIG_USB_DWC3_HOST) || IS_ENABLED(CONFIG_USB_DWC3_DUAL_ROLE)
int dwc3_host_init(struct dwc3 *dwc);
void dwc3_host_exit(struct dwc3 *dwc);
@ -1317,11 +1334,23 @@ static inline int dwc3_send_gadget_generic_command(struct dwc3 *dwc,
#if IS_ENABLED(CONFIG_USB_DWC3_DUAL_ROLE)
int dwc3_drd_init(struct dwc3 *dwc);
void dwc3_drd_exit(struct dwc3 *dwc);
void dwc3_otg_init(struct dwc3 *dwc);
void dwc3_otg_exit(struct dwc3 *dwc);
void dwc3_otg_update(struct dwc3 *dwc, bool ignore_idstatus);
void dwc3_otg_host_init(struct dwc3 *dwc);
#else
static inline int dwc3_drd_init(struct dwc3 *dwc)
{ return 0; }
static inline void dwc3_drd_exit(struct dwc3 *dwc)
{ }
static inline void dwc3_otg_init(struct dwc3 *dwc)
{ }
static inline void dwc3_otg_exit(struct dwc3 *dwc)
{ }
static inline void dwc3_otg_update(struct dwc3 *dwc, bool ignore_idstatus)
{ }
static inline void dwc3_otg_host_init(struct dwc3 *dwc)
{ }
#endif
/* power management interface */

489
drivers/usb/dwc3/drd.c
View file

@ -8,22 +8,423 @@
*/
#include <linux/extcon.h>
#include <linux/platform_device.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 = 0;
}
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 = 1;
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(dwc3_pdev, "otg");
if (irq > 0)
goto out;
if (irq == -EPROBE_DEFER)
goto out;
irq = platform_get_irq_byname(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 != -EPROBE_DEFER)
dev_err(dwc->dev, "missing OTG IRQ\n");
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;
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);
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,
@ -40,11 +441,11 @@ static int dwc3_drd_notifier(struct notifier_block *nb,
int dwc3_drd_init(struct dwc3 *dwc)
{
int ret;
int ret, irq;
if (dwc->dev->of_node) {
if (of_property_read_bool(dwc->dev->of_node, "extcon"))
dwc->edev = extcon_get_edev_by_phandle(dwc->dev, 0);
if (dwc->dev->of_node &&
of_property_read_bool(dwc->dev->of_node, "extcon")) {
dwc->edev = extcon_get_edev_by_phandle(dwc->dev, 0);
if (IS_ERR(dwc->edev))
return PTR_ERR(dwc->edev);
@ -56,19 +457,71 @@ int dwc3_drd_init(struct dwc3 *dwc)
dev_err(dwc->dev, "couldn't register cable notifier\n");
return ret;
}
}
dwc3_drd_update(dwc);
dwc3_drd_update(dwc);
} else {
dwc3_set_prtcap(dwc, DWC3_GCTL_PRTCAP_OTG);
dwc->current_dr_role = 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)
{
extcon_unregister_notifier(dwc->edev, EXTCON_USB_HOST,
&dwc->edev_nb);
unsigned long flags;
dwc3_set_mode(dwc, DWC3_GCTL_PRTCAP_DEVICE);
flush_work(&dwc->drd_work);
dwc3_gadget_exit(dwc);
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->edev)
free_irq(dwc->otg_irq, dwc);
}