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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: Alexander 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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -36,10 +36,22 @@
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#define USB_WAKEUP_EN_MASK GENMASK(5, 0)
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/* USB glue registers */
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#define USB_CTRL0 0x00
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#define USB_CTRL1 0x04
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#define USB_CTRL0_PORTPWR_EN BIT(12) /* 1 - PPC enabled (default) */
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#define USB_CTRL0_USB3_FIXED BIT(22) /* 1 - USB3 permanent attached */
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#define USB_CTRL0_USB2_FIXED BIT(23) /* 1 - USB2 permanent attached */
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#define USB_CTRL1_OC_POLARITY BIT(16) /* 0 - HIGH / 1 - LOW */
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#define USB_CTRL1_PWR_POLARITY BIT(17) /* 0 - HIGH / 1 - LOW */
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struct dwc3_imx8mp {
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struct device *dev;
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struct platform_device *dwc3;
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void __iomem *hsio_blk_base;
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void __iomem *glue_base;
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struct clk *hsio_clk;
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struct clk *suspend_clk;
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int irq;
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@ -47,6 +59,42 @@ struct dwc3_imx8mp {
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bool wakeup_pending;
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};
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static void imx8mp_configure_glue(struct dwc3_imx8mp *dwc3_imx)
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{
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struct device *dev = dwc3_imx->dev;
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u32 value;
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if (!dwc3_imx->glue_base)
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return;
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value = readl(dwc3_imx->glue_base + USB_CTRL0);
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if (device_property_read_bool(dev, "fsl,permanently-attached"))
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value |= (USB_CTRL0_USB2_FIXED | USB_CTRL0_USB3_FIXED);
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else
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value &= ~(USB_CTRL0_USB2_FIXED | USB_CTRL0_USB3_FIXED);
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if (device_property_read_bool(dev, "fsl,disable-port-power-control"))
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value &= ~(USB_CTRL0_PORTPWR_EN);
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else
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value |= USB_CTRL0_PORTPWR_EN;
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writel(value, dwc3_imx->glue_base + USB_CTRL0);
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value = readl(dwc3_imx->glue_base + USB_CTRL1);
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if (device_property_read_bool(dev, "fsl,over-current-active-low"))
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value |= USB_CTRL1_OC_POLARITY;
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else
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value &= ~USB_CTRL1_OC_POLARITY;
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if (device_property_read_bool(dev, "fsl,power-active-low"))
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value |= USB_CTRL1_PWR_POLARITY;
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else
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value &= ~USB_CTRL1_PWR_POLARITY;
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writel(value, dwc3_imx->glue_base + USB_CTRL1);
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}
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static void dwc3_imx8mp_wakeup_enable(struct dwc3_imx8mp *dwc3_imx)
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{
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struct dwc3 *dwc3 = platform_get_drvdata(dwc3_imx->dwc3);
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@ -100,6 +148,7 @@ static int dwc3_imx8mp_probe(struct platform_device *pdev)
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struct device *dev = &pdev->dev;
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struct device_node *dwc3_np, *node = dev->of_node;
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struct dwc3_imx8mp *dwc3_imx;
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struct resource *res;
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int err, irq;
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if (!node) {
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@ -119,6 +168,15 @@ static int dwc3_imx8mp_probe(struct platform_device *pdev)
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if (IS_ERR(dwc3_imx->hsio_blk_base))
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return PTR_ERR(dwc3_imx->hsio_blk_base);
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res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
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if (!res) {
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dev_warn(dev, "Base address for glue layer missing. Continuing without, some features are missing though.");
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} else {
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dwc3_imx->glue_base = devm_ioremap_resource(dev, res);
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if (IS_ERR(dwc3_imx->glue_base))
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return PTR_ERR(dwc3_imx->glue_base);
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}
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dwc3_imx->hsio_clk = devm_clk_get(dev, "hsio");
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if (IS_ERR(dwc3_imx->hsio_clk)) {
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err = PTR_ERR(dwc3_imx->hsio_clk);
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@ -152,6 +210,8 @@ static int dwc3_imx8mp_probe(struct platform_device *pdev)
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}
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dwc3_imx->irq = irq;
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imx8mp_configure_glue(dwc3_imx);
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pm_runtime_set_active(dev);
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pm_runtime_enable(dev);
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err = pm_runtime_get_sync(dev);
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@ -252,6 +312,9 @@ static int __maybe_unused dwc3_imx8mp_resume(struct dwc3_imx8mp *dwc3_imx,
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dwc3_imx8mp_wakeup_disable(dwc3_imx);
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dwc3_imx->pm_suspended = false;
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/* Upon power loss any previous configuration is lost, restore it */
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imx8mp_configure_glue(dwc3_imx);
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if (dwc3_imx->wakeup_pending) {
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dwc3_imx->wakeup_pending = false;
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if (dwc->current_dr_role == DWC3_GCTL_PRTCAP_DEVICE) {
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