Commit 802fde98 authored by Paul Zimmerman's avatar Paul Zimmerman Committed by Felipe Balbi
Browse files

usb: dwc3: support new revisions of DWC3 core 



Recent cores (>= 1.94a) have a set of new features,
commands and a slightly different programming model.

This patch aims to support those changes.

Signed-off-by: default avatarPaul Zimmerman <paulz@synopsys.com>
Signed-off-by: default avatarFelipe Balbi <balbi@ti.com>
parent d7a46a8d

drivers/usb/dwc3/gadget.c

+70 −13
Original line number Diff line number Diff line
@@ -100,6 +100,23 @@ int dwc3_gadget_set_link_state(struct dwc3 *dwc, enum dwc3_link_state state) 
	int		retries = 10000;

	u32		reg;



	/*

	 * Wait until device controller is ready. Only applies to 1.94a and

	 * later RTL.

	 */

	if (dwc->revision >= DWC3_REVISION_194A) {

		while (--retries) {

			reg = dwc3_readl(dwc->regs, DWC3_DSTS);

			if (reg & DWC3_DSTS_DCNRD)

				udelay(5);

			else

				break;

		}



		if (retries <= 0)

			return -ETIMEDOUT;

	}



	reg = dwc3_readl(dwc->regs, DWC3_DCTL);

	reg &= ~DWC3_DCTL_ULSTCHNGREQ_MASK;
@@ -107,6 +124,13 @@ int dwc3_gadget_set_link_state(struct dwc3 *dwc, enum dwc3_link_state state) 
	reg |= DWC3_DCTL_ULSTCHNGREQ(state);

	dwc3_writel(dwc->regs, DWC3_DCTL, reg);



	/*

	 * The following code is racy when called from dwc3_gadget_wakeup,

	 * and is not needed, at least on newer versions

	 */

	if (dwc->revision >= DWC3_REVISION_194A)

		return 0;



	/* wait for a change in DSTS */

	retries = 10000;

	while (--retries) {
@@ -266,8 +290,8 @@ static const char *dwc3_gadget_ep_cmd_string(u8 cmd) 
		return "Clear Stall";

	case DWC3_DEPCMD_SETSTALL:

		return "Set Stall";

	case DWC3_DEPCMD_GETSEQNUMBER:

		return "Get Data Sequence Number";

	case DWC3_DEPCMD_GETEPSTATE:

		return "Get Endpoint State";

	case DWC3_DEPCMD_SETTRANSFRESOURCE:

		return "Set Endpoint Transfer Resource";

	case DWC3_DEPCMD_SETEPCONFIG:
@@ -1280,9 +1304,12 @@ static int dwc3_gadget_wakeup(struct usb_gadget *g) 
		goto out;

	}



	/* Recent versions do this automatically */

	if (dwc->revision < DWC3_REVISION_194A) {

		/* write zeroes to Link Change Request */

		reg &= ~DWC3_DCTL_ULSTCHNGREQ_MASK;

		dwc3_writel(dwc->regs, DWC3_DCTL, reg);

	}



	/* poll until Link State changes to ON */

	timeout = jiffies + msecs_to_jiffies(100);
@@ -1326,9 +1353,14 @@ static void dwc3_gadget_run_stop(struct dwc3 *dwc, int is_on) 


	reg = dwc3_readl(dwc->regs, DWC3_DCTL);

	if (is_on) {

		if (dwc->revision <= DWC3_REVISION_187A) {

			reg &= ~DWC3_DCTL_TRGTULST_MASK;

		reg |= (DWC3_DCTL_RUN_STOP

				| DWC3_DCTL_TRGTULST_RX_DET);

			reg |= DWC3_DCTL_TRGTULST_RX_DET;

		}



		if (dwc->revision >= DWC3_REVISION_194A)

			reg &= ~DWC3_DCTL_KEEP_CONNECT;

		reg |= DWC3_DCTL_RUN_STOP;

	} else {

		reg &= ~DWC3_DCTL_RUN_STOP;

	}
@@ -1468,6 +1500,7 @@ static int dwc3_gadget_stop(struct usb_gadget *g, 


	return 0;

}



static const struct usb_gadget_ops dwc3_gadget_ops = {

	.get_frame		= dwc3_gadget_get_frame,

	.wakeup			= dwc3_gadget_wakeup,
@@ -1962,9 +1995,12 @@ static void dwc3_gadget_reset_interrupt(struct dwc3 *dwc) 
	/* after reset -> Default State */

	dwc->dev_state = DWC3_DEFAULT_STATE;



	/* Recent versions support automatic phy suspend and don't need this */

	if (dwc->revision < DWC3_REVISION_194A) {

		/* Resume PHYs */

		dwc3_gadget_usb2_phy_suspend(dwc, false);

		dwc3_gadget_usb3_phy_suspend(dwc, false);

	}



	if (dwc->gadget.speed != USB_SPEED_UNKNOWN)

		dwc3_disconnect_gadget(dwc);
@@ -2082,8 +2118,11 @@ static void dwc3_gadget_conndone_interrupt(struct dwc3 *dwc) 
		break;

	}



	/* Suspend unneded PHY */

	/* Recent versions support automatic phy suspend and don't need this */

	if (dwc->revision < DWC3_REVISION_194A) {

		/* Suspend unneeded PHY */

		dwc3_gadget_phy_suspend(dwc, dwc->gadget.speed);

	}



	dep = dwc->eps[0];

	ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL);
@@ -2389,6 +2428,24 @@ int __devinit dwc3_gadget_init(struct dwc3 *dwc) 
			DWC3_DEVTEN_DISCONNEVTEN);

	dwc3_writel(dwc->regs, DWC3_DEVTEN, reg);



	/* Enable USB2 LPM and automatic phy suspend only on recent versions */

	if (dwc->revision >= DWC3_REVISION_194A) {

		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_HIRD_THRES_MASK | DWC3_DCTL_L1_HIBER_EN);



		/* TODO: This should be configurable */

		reg |= DWC3_DCTL_HIRD_THRES(31);



		dwc3_writel(dwc->regs, DWC3_DCTL, reg);



		dwc3_gadget_usb2_phy_suspend(dwc, true);

		dwc3_gadget_usb3_phy_suspend(dwc, true);

	}



	ret = device_register(&dwc->gadget.dev);

	if (ret) {

		dev_err(dwc->dev, "failed to register gadget device\n");