Commit 9d521071 authored by Alexander Stein's avatar Alexander Stein Committed by Greg Kroah-Hartman
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usb: dwc3: imx8mp: Add support for setting SOC specific flags 



The i.MX8MP glue layer has support for the following flags:
* over-current polarity
* PWR pad polarity
* controlling PPC flag in HCCPARAMS register
* permanent port attach for usb2 & usb3 port

Allow setting these flags by supporting specific flags in the glue node.
In order to get this to work an additional IORESOURCE_MEM and clock is
necessary. For backward compatibility this is purely optional.

Signed-off-by: default avatarAlexander Stein <alexander.stein@ew.tq-group.com>
Link: https://lore.kernel.org/r/20220218152707.2198357-4-alexander.stein@ew.tq-group.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent d600d31e

drivers/usb/dwc3/dwc3-imx8mp.c

+63 −0
Original line number Diff line number Diff line
@@ -36,10 +36,22 @@ 


#define USB_WAKEUP_EN_MASK		GENMASK(5, 0)



/* USB glue registers */

#define USB_CTRL0		0x00

#define USB_CTRL1		0x04



#define USB_CTRL0_PORTPWR_EN	BIT(12) /* 1 - PPC enabled (default) */

#define USB_CTRL0_USB3_FIXED	BIT(22) /* 1 - USB3 permanent attached */

#define USB_CTRL0_USB2_FIXED	BIT(23) /* 1 - USB2 permanent attached */



#define USB_CTRL1_OC_POLARITY	BIT(16) /* 0 - HIGH / 1 - LOW */

#define USB_CTRL1_PWR_POLARITY	BIT(17) /* 0 - HIGH / 1 - LOW */



struct dwc3_imx8mp {

	struct device			*dev;

	struct platform_device		*dwc3;

	void __iomem			*hsio_blk_base;

	void __iomem			*glue_base;

	struct clk			*hsio_clk;

	struct clk			*suspend_clk;

	int				irq;
@@ -47,6 +59,42 @@ struct dwc3_imx8mp { 
	bool				wakeup_pending;

};



static void imx8mp_configure_glue(struct dwc3_imx8mp *dwc3_imx)

{

	struct device *dev = dwc3_imx->dev;

	u32 value;



	if (!dwc3_imx->glue_base)

		return;



	value = readl(dwc3_imx->glue_base + USB_CTRL0);



	if (device_property_read_bool(dev, "fsl,permanently-attached"))

		value |= (USB_CTRL0_USB2_FIXED | USB_CTRL0_USB3_FIXED);

	else

		value &= ~(USB_CTRL0_USB2_FIXED | USB_CTRL0_USB3_FIXED);



	if (device_property_read_bool(dev, "fsl,disable-port-power-control"))

		value &= ~(USB_CTRL0_PORTPWR_EN);

	else

		value |= USB_CTRL0_PORTPWR_EN;



	writel(value, dwc3_imx->glue_base + USB_CTRL0);



	value = readl(dwc3_imx->glue_base + USB_CTRL1);

	if (device_property_read_bool(dev, "fsl,over-current-active-low"))

		value |= USB_CTRL1_OC_POLARITY;

	else

		value &= ~USB_CTRL1_OC_POLARITY;



	if (device_property_read_bool(dev, "fsl,power-active-low"))

		value |= USB_CTRL1_PWR_POLARITY;

	else

		value &= ~USB_CTRL1_PWR_POLARITY;



	writel(value, dwc3_imx->glue_base + USB_CTRL1);

}



static void dwc3_imx8mp_wakeup_enable(struct dwc3_imx8mp *dwc3_imx)

{

	struct dwc3	*dwc3 = platform_get_drvdata(dwc3_imx->dwc3);
@@ -100,6 +148,7 @@ static int dwc3_imx8mp_probe(struct platform_device *pdev) 
	struct device		*dev = &pdev->dev;

	struct device_node	*dwc3_np, *node = dev->of_node;

	struct dwc3_imx8mp	*dwc3_imx;

	struct resource		*res;

	int			err, irq;



	if (!node) {
@@ -119,6 +168,15 @@ static int dwc3_imx8mp_probe(struct platform_device *pdev) 
	if (IS_ERR(dwc3_imx->hsio_blk_base))

		return PTR_ERR(dwc3_imx->hsio_blk_base);



	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);

	if (!res) {

		dev_warn(dev, "Base address for glue layer missing. Continuing without, some features are missing though.");

	} else {

		dwc3_imx->glue_base = devm_ioremap_resource(dev, res);

		if (IS_ERR(dwc3_imx->glue_base))

			return PTR_ERR(dwc3_imx->glue_base);

	}



	dwc3_imx->hsio_clk = devm_clk_get(dev, "hsio");

	if (IS_ERR(dwc3_imx->hsio_clk)) {

		err = PTR_ERR(dwc3_imx->hsio_clk);
@@ -152,6 +210,8 @@ static int dwc3_imx8mp_probe(struct platform_device *pdev) 
	}

	dwc3_imx->irq = irq;



	imx8mp_configure_glue(dwc3_imx);



	pm_runtime_set_active(dev);

	pm_runtime_enable(dev);

	err = pm_runtime_get_sync(dev);
@@ -252,6 +312,9 @@ static int __maybe_unused dwc3_imx8mp_resume(struct dwc3_imx8mp *dwc3_imx, 
	dwc3_imx8mp_wakeup_disable(dwc3_imx);

	dwc3_imx->pm_suspended = false;



	/* Upon power loss any previous configuration is lost, restore it */

	imx8mp_configure_glue(dwc3_imx);



	if (dwc3_imx->wakeup_pending) {

		dwc3_imx->wakeup_pending = false;

		if (dwc->current_dr_role == DWC3_GCTL_PRTCAP_DEVICE) {