diff options
Diffstat (limited to 'drivers/usb/dwc3/dwc3-imx8mp.c')
| -rw-r--r-- | drivers/usb/dwc3/dwc3-imx8mp.c | 77 |
1 files changed, 70 insertions, 7 deletions
diff --git a/drivers/usb/dwc3/dwc3-imx8mp.c b/drivers/usb/dwc3/dwc3-imx8mp.c index d328d20abfbc..174f07614318 100644 --- a/drivers/usb/dwc3/dwc3-imx8mp.c +++ b/drivers/usb/dwc3/dwc3-imx8mp.c @@ -36,9 +36,21 @@ #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; @@ -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); @@ -55,7 +103,7 @@ static void dwc3_imx8mp_wakeup_enable(struct dwc3_imx8mp *dwc3_imx) if (!dwc3) return; - val = readl(dwc3_imx->glue_base + USB_WAKEUP_CTRL); + val = readl(dwc3_imx->hsio_blk_base + USB_WAKEUP_CTRL); if ((dwc3->current_dr_role == DWC3_GCTL_PRTCAP_HOST) && dwc3->xhci) val |= USB_WAKEUP_EN | USB_WAKEUP_SS_CONN | @@ -64,16 +112,16 @@ static void dwc3_imx8mp_wakeup_enable(struct dwc3_imx8mp *dwc3_imx) val |= USB_WAKEUP_EN | USB_WAKEUP_VBUS_EN | USB_WAKEUP_VBUS_SRC_SESS_VAL; - writel(val, dwc3_imx->glue_base + USB_WAKEUP_CTRL); + writel(val, dwc3_imx->hsio_blk_base + USB_WAKEUP_CTRL); } static void dwc3_imx8mp_wakeup_disable(struct dwc3_imx8mp *dwc3_imx) { u32 val; - val = readl(dwc3_imx->glue_base + USB_WAKEUP_CTRL); + val = readl(dwc3_imx->hsio_blk_base + USB_WAKEUP_CTRL); val &= ~(USB_WAKEUP_EN | USB_WAKEUP_EN_MASK); - writel(val, dwc3_imx->glue_base + USB_WAKEUP_CTRL); + writel(val, dwc3_imx->hsio_blk_base + USB_WAKEUP_CTRL); } static irqreturn_t dwc3_imx8mp_interrupt(int irq, void *_dwc3_imx) @@ -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) { @@ -115,9 +164,18 @@ static int dwc3_imx8mp_probe(struct platform_device *pdev) dwc3_imx->dev = dev; - dwc3_imx->glue_base = devm_platform_ioremap_resource(pdev, 0); - if (IS_ERR(dwc3_imx->glue_base)) - return PTR_ERR(dwc3_imx->glue_base); + dwc3_imx->hsio_blk_base = devm_platform_ioremap_resource(pdev, 0); + 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)) { @@ -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) { |