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usb: dwc3: ep0: add LPM handling 

On device loading the driver enables LPM and the acceptance of U1 and U2
states. The [Set|Clear]Feature requests for "U1/U2" are forwarded
directly to the hardware and allow / forbid the initiation of the low
power links.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Felipe Balbi <balbi@ti.com>
hifive-unleashed-5.1
Sebastian Andrzej Siewior 2011-09-13 17:54:39 +02:00 committed by Felipe Balbi
parent 51249dca62
commit e6a3b5e288
3 changed files with 45 additions and 11 deletions
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1
drivers/usb/dwc3/core.h
View File

@ -194,6 +194,7 @@
#define DWC3_GHWPARAMS1_EN_PWROPT_CLK 1
/* Device Configuration Register */
#define DWC3_DCFG_LPM_CAP (1 << 22)
#define DWC3_DCFG_DEVADDR(addr) ((addr) << 3)
#define DWC3_DCFG_DEVADDR_MASK DWC3_DCFG_DEVADDR(0x7f)

46
drivers/usb/dwc3/ep0.c
View File

@ -261,6 +261,7 @@ static int dwc3_ep0_handle_status(struct dwc3 *dwc,
{
struct dwc3_ep *dep;
u32 recip;
u32 reg;
u16 usb_status = 0;
__le16 *response_pkt;
@ -268,10 +269,18 @@ static int dwc3_ep0_handle_status(struct dwc3 *dwc,
switch (recip) {
case USB_RECIP_DEVICE:
/*
* We are self-powered. U1/U2/LTM will be set later
* once we handle this states. RemoteWakeup is 0 on SS
* LTM will be set once we know how to set this in HW.
*/
usb_status |= dwc->is_selfpowered << USB_DEVICE_SELF_POWERED;
if (dwc->speed == DWC3_DSTS_SUPERSPEED) {
reg = dwc3_readl(dwc->regs, DWC3_DCTL);
if (reg & DWC3_DCTL_INITU1ENA)
usb_status |= 1 << USB_DEV_STAT_U1_ENABLED;
if (reg & DWC3_DCTL_INITU2ENA)
usb_status |= 1 << USB_DEV_STAT_U2_ENABLED;
}
break;
case USB_RECIP_INTERFACE:
@ -312,6 +321,7 @@ static int dwc3_ep0_handle_feature(struct dwc3 *dwc,
u32 recip;
u32 wValue;
u32 wIndex;
u32 reg;
int ret;
wValue = le16_to_cpu(ctrl->wValue);
@ -320,29 +330,43 @@ static int dwc3_ep0_handle_feature(struct dwc3 *dwc,
switch (recip) {
case USB_RECIP_DEVICE:
switch (wValue) {
case USB_DEVICE_REMOTE_WAKEUP:
break;
/*
* 9.4.1 says only only for SS, in AddressState only for
* default control pipe
*/
switch (wValue) {
case USB_DEVICE_U1_ENABLE:
case USB_DEVICE_U2_ENABLE:
case USB_DEVICE_LTM_ENABLE:
if (dwc->dev_state != DWC3_CONFIGURED_STATE)
return -EINVAL;
if (dwc->speed != DWC3_DSTS_SUPERSPEED)
return -EINVAL;
}
/* XXX add U[12] & LTM */
switch (wValue) {
case USB_DEVICE_REMOTE_WAKEUP:
break;
case USB_DEVICE_U1_ENABLE:
reg = dwc3_readl(dwc->regs, DWC3_DCTL);
if (set)
reg |= DWC3_DCTL_INITU1ENA;
else
reg &= ~DWC3_DCTL_INITU1ENA;
dwc3_writel(dwc->regs, DWC3_DCTL, reg);
break;
case USB_DEVICE_U2_ENABLE:
if (dwc->dev_state != DWC3_CONFIGURED_STATE)
return -EINVAL;
if (dwc->speed != DWC3_DSTS_SUPERSPEED)
return -EINVAL;
reg = dwc3_readl(dwc->regs, DWC3_DCTL);
if (set)
reg |= DWC3_DCTL_INITU2ENA;
else
reg &= ~DWC3_DCTL_INITU2ENA;
dwc3_writel(dwc->regs, DWC3_DCTL, reg);
break;
case USB_DEVICE_LTM_ENABLE:
return -EINVAL;
break;
case USB_DEVICE_TEST_MODE:

9
drivers/usb/dwc3/gadget.c
View File

@ -1933,6 +1933,7 @@ static void dwc3_gadget_reset_interrupt(struct dwc3 *dwc)
reg = dwc3_readl(dwc->regs, DWC3_DCTL);
reg &= ~DWC3_DCTL_TSTCTRL_MASK;
reg &= ~(DWC3_DCTL_INITU1ENA | DWC3_DCTL_INITU2ENA);
dwc3_writel(dwc->regs, DWC3_DCTL, reg);
dwc->test_mode = false;
@ -2330,6 +2331,14 @@ int __devinit dwc3_gadget_init(struct dwc3 *dwc)
goto err5;
}
reg = dwc3_readl(dwc->regs, DWC3_DCFG);
reg |= DWC3_DCFG_LPM_CAP;
dwc3_writel(dwc->regs, DWC3_DCFG, reg);
reg = dwc3_readl(dwc->regs, DWC3_DCTL);
reg |= DWC3_DCTL_ACCEPTU1ENA | DWC3_DCTL_ACCEPTU2ENA;
dwc3_writel(dwc->regs, DWC3_DCTL, reg);
/* Enable all but Start and End of Frame IRQs */
reg = (DWC3_DEVTEN_VNDRDEVTSTRCVEDEN |
DWC3_DEVTEN_EVNTOVERFLOWEN |