1 files changed, 417 insertions, 0 deletions
diff --git a/drivers/usb/dwc3/dwc3-imx8mp.c b/drivers/usb/dwc3/dwc3-imx8mp.c
new file mode 100644
index 000000000000..0235ea22abbd
--- /dev/null
+++ b/drivers/usb/dwc3/dwc3-imx8mp.c
@@ -0,0 +1,417 @@
+// SPDX-License-Identifier: GPL-2.0
+/**
+ * dwc3-imx8mp.c - NXP imx8mp Specific Glue layer
+ *
+ * Copyright (c) 2020 NXP.
+ */
+
+#include <linux/clk.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+#include <linux/of_platform.h>
+#include <linux/pm_runtime.h>
+#include <linux/busfreq-imx.h>
+
+#include "core.h"
+
+/* USB wakeup registers */
+#define USB_WAKEUP_CTRL			0x00
+#define USB_WAKEUP_STATUS		0x04
+
+/* Global wakeup interrupt enable, also used to clear interrupt */
+#define USB_WAKEUP_EN			BIT(31)
+/* wakeup from connection or disconnection, only for superspeed */
+#define USB_WAKEUP_SS_CONN		BIT(5)
+/* 0 select vbus_valid, 1 select sessvld */
+#define USB_WAKEUP_VBUS_SRC_SESS_VAL	BIT(4)
+/* Enable signal for wake up from u3 state */
+#define USB_WAKEUP_U3_EN		BIT(3)
+/* Enable signal for wake up from id change */
+#define USB_WAKEUP_ID_EN		BIT(2)
+/* Enable signal for wake up from vbus change */
+#define	USB_WAKEUP_VBUS_EN		BIT(1)
+/* Enable signal for wake up from dp/dm change */
+#define USB_WAKEUP_DPDM_EN		BIT(0)
+
+#define USB_WAKEUP_EN_MASK		GENMASK(5, 0)
+
+struct dwc3_imx8mp {
+	struct device			*dev;
+	struct platform_device		*dwc3;
+	void __iomem			*glue_base;
+	struct clk			*hsio_clk;
+	struct clk			*suspend_clk;
+	int				irq;
+	bool				pm_suspended;
+	bool				wakeup_pending;
+};
+
+static void dwc_imx8mp_wakeup_enable(struct dwc3_imx8mp *dwc_imx)
+{
+	struct dwc3	*dwc = platform_get_drvdata(dwc_imx->dwc3);
+	u32		val;
+
+	if (!dwc)
+		return;
+
+	val = readl(dwc_imx->glue_base + USB_WAKEUP_CTRL);
+
+	if ((dwc->current_dr_role == DWC3_GCTL_PRTCAP_HOST) && dwc->xhci)
+		val |= USB_WAKEUP_EN | USB_WAKEUP_SS_CONN |
+		       USB_WAKEUP_U3_EN | USB_WAKEUP_DPDM_EN;
+	else if (dwc->current_dr_role == DWC3_GCTL_PRTCAP_DEVICE)
+		val |= USB_WAKEUP_EN | USB_WAKEUP_VBUS_EN |
+		       USB_WAKEUP_VBUS_SRC_SESS_VAL;
+
+	writel(val, dwc_imx->glue_base + USB_WAKEUP_CTRL);
+
+}
+
+static void dwc_imx8mp_wakeup_disable(struct dwc3_imx8mp *dwc_imx)
+{
+	u32 val;
+
+	val = readl(dwc_imx->glue_base + USB_WAKEUP_CTRL);
+	val &= ~(USB_WAKEUP_EN | USB_WAKEUP_EN_MASK);
+	writel(val, dwc_imx->glue_base + USB_WAKEUP_CTRL);
+}
+
+/* U3 wakeup enable only if hsiomix will not be off */
+static int dwc_imx8mp_wakeup_disable_u3(struct dwc3_imx8mp *dwc_imx)
+{
+	u32 val;
+
+	val = readl(dwc_imx->glue_base + USB_WAKEUP_CTRL);
+	val &= ~USB_WAKEUP_U3_EN;
+	writel(val, dwc_imx->glue_base + USB_WAKEUP_CTRL);
+
+	return 0;
+}
+
+static irqreturn_t dwc3_imx8mp_interrupt(int irq, void *_dwc_imx)
+{
+	struct dwc3_imx8mp	*dwc_imx = _dwc_imx;
+	struct dwc3		*dwc = platform_get_drvdata(dwc_imx->dwc3);
+
+	if (!dwc_imx->pm_suspended)
+		return IRQ_HANDLED;
+
+	disable_irq_nosync(dwc_imx->irq);
+	dwc_imx->wakeup_pending = true;
+
+	if (!dwc) {
+		pm_runtime_resume(dwc_imx->dev);
+		return IRQ_HANDLED;
+	}
+
+	/*
+	 * runtime resume xhci or gadget, dwc3_imx8mp itself
+	 * as parent device will be resumed firstly by pm core
+	 */
+	if ((dwc->current_dr_role == DWC3_GCTL_PRTCAP_HOST) && dwc->xhci)
+		pm_runtime_resume(&dwc->xhci->dev);
+	else if (dwc->current_dr_role == DWC3_GCTL_PRTCAP_DEVICE)
+		pm_runtime_get(dwc->dev);
+
+	return IRQ_HANDLED;
+}
+
+static void dwc3_imx8mp_set_role_post(struct dwc3 *dwc, u32 role)
+{
+	switch (role) {
+	case DWC3_GCTL_PRTCAP_HOST:
+		/*
+		 * For xhci host, we need disable dwc core auto
+		 * suspend, because during this auto suspend delay(5s),
+		 * xhci host RUN_STOP is cleared and wakeup is not
+		 * enabled, if device is inserted, xhci host can't
+		 * response the connection.
+		 */
+		pm_runtime_dont_use_autosuspend(dwc->dev);
+		break;
+	case DWC3_GCTL_PRTCAP_DEVICE:
+		pm_runtime_use_autosuspend(dwc->dev);
+		break;
+	default:
+		break;
+	}
+}
+
+static struct xhci_plat_priv dwc3_imx8mp_xhci_priv = {
+	.quirks = XHCI_NO_64BIT_SUPPORT |
+		  XHCI_MISSING_CAS |
+		  XHCI_SKIP_PHY_INIT,
+};
+
+static struct dwc3_platform_data dwc3_imx8mp_pdata = {
+	.xhci_priv = &dwc3_imx8mp_xhci_priv,
+	.set_role_post = dwc3_imx8mp_set_role_post,
+	.quirks = DWC3_SOFT_ITP_SYNC,
+};
+
+static struct of_dev_auxdata dwc3_imx8mp_auxdata[] = {
+	{
+	.compatible = "snps,dwc3",
+	.platform_data = &dwc3_imx8mp_pdata,
+	},
+	{},
+};
+
+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	*dwc_imx;
+	int			error, irq;
+
+	if (!node) {
+		dev_err(dev, "device node not found\n");
+		return -EINVAL;
+	}
+
+	dwc_imx = devm_kzalloc(dev, sizeof(*dwc_imx), GFP_KERNEL);
+	if (!dwc_imx)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, dwc_imx);
+
+	dwc_imx->dev = dev;
+
+	dwc_imx->glue_base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(dwc_imx->glue_base))
+		return PTR_ERR(dwc_imx->glue_base);
+
+	request_bus_freq(BUS_FREQ_HIGH);
+
+	dwc_imx->hsio_clk = devm_clk_get(dev, "hsio");
+	if (IS_ERR(dwc_imx->hsio_clk)) {
+		error = PTR_ERR(dwc_imx->hsio_clk);
+		dev_err(dev, "Failed to get hsio clk, err=%d\n", error);
+		goto rel_high_bus;
+	}
+
+	error = clk_prepare_enable(dwc_imx->hsio_clk);
+	if (error) {
+		dev_err(dev, "Failed to enable hsio clk, err=%d\n", error);
+		goto rel_high_bus;
+	}
+
+	dwc_imx->suspend_clk = devm_clk_get(dev, "suspend");
+	if (IS_ERR(dwc_imx->suspend_clk)) {
+		error = PTR_ERR(dwc_imx->suspend_clk);
+		dev_err(dev, "Failed to get suspend clk, err=%d\n", error);
+		goto disable_hsio_clk;
+	}
+
+	error = clk_prepare_enable(dwc_imx->suspend_clk);
+	if (error) {
+		dev_err(dev, "Failed to enable suspend clk, err=%d\n", error);
+		goto disable_hsio_clk;
+	}
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0) {
+		error = irq;
+		goto disable_clks;
+	}
+	dwc_imx->irq = irq;
+
+	error = devm_request_threaded_irq(dev, irq, NULL, dwc3_imx8mp_interrupt,
+					  IRQF_ONESHOT, dev_name(dev), dwc_imx);
+	if (error) {
+		dev_err(dev, "failed to request IRQ #%d --> %d\n",
+				irq, error);
+		goto disable_clks;
+	}
+
+	dwc3_np = of_get_child_by_name(node, "dwc3");
+	if (!dwc3_np) {
+		dev_err(dev, "failed to find dwc3 core child\n");
+		goto disable_clks;
+	}
+
+	error = of_platform_populate(node, NULL, dwc3_imx8mp_auxdata, dev);
+	if (error) {
+		dev_err(&pdev->dev, "failed to create dwc3 core\n");
+		goto disable_clks;
+	}
+
+	dwc_imx->dwc3 = of_find_device_by_node(dwc3_np);
+	if (!dwc_imx->dwc3) {
+		dev_err(dev, "failed to get dwc3 platform device\n");
+		error = -ENODEV;
+		goto depopulate;
+	}
+	of_node_put(dwc3_np);
+
+	device_set_wakeup_capable(dev, true);
+	pm_runtime_set_active(dev);
+	pm_runtime_enable(dev);
+
+	return 0;
+
+depopulate:
+	of_platform_depopulate(dev);
+disable_clks:
+	clk_disable_unprepare(dwc_imx->suspend_clk);
+disable_hsio_clk:
+	clk_disable_unprepare(dwc_imx->hsio_clk);
+rel_high_bus:
+	release_bus_freq(BUS_FREQ_HIGH);
+
+	return error;
+}
+
+static int dwc3_imx8mp_remove(struct platform_device *pdev)
+{
+	struct dwc3_imx8mp *dwc_imx = platform_get_drvdata(pdev);
+	struct device *dev = &pdev->dev;
+
+	pm_runtime_get_sync(dev);
+	of_platform_depopulate(dev);
+
+	clk_disable_unprepare(dwc_imx->hsio_clk);
+	release_bus_freq(BUS_FREQ_HIGH);
+
+	pm_runtime_disable(dev);
+	pm_runtime_put_noidle(dev);
+	platform_set_drvdata(pdev, NULL);
+
+	return 0;
+}
+
+static int dwc3_imx8mp_suspend(struct dwc3_imx8mp *dwc_imx, pm_message_t msg)
+{
+	if (dwc_imx->pm_suspended)
+		return 0;
+
+	/* Wakeup enable */
+	if (PMSG_IS_AUTO(msg) || device_may_wakeup(dwc_imx->dev))
+		dwc_imx8mp_wakeup_enable(dwc_imx);
+
+	release_bus_freq(BUS_FREQ_HIGH);
+	dwc_imx->pm_suspended = true;
+
+	return 0;
+}
+
+static int dwc3_imx8mp_resume(struct dwc3_imx8mp *dwc_imx, pm_message_t msg)
+{
+	struct dwc3	*dwc = platform_get_drvdata(dwc_imx->dwc3);
+	int ret = 0;
+
+	if (!dwc_imx->pm_suspended)
+		return 0;
+
+	request_bus_freq(BUS_FREQ_HIGH);
+
+	/* Wakeup disable */
+	dwc_imx8mp_wakeup_disable(dwc_imx);
+	dwc_imx->pm_suspended = false;
+
+	if (dwc_imx->wakeup_pending) {
+		dwc_imx->wakeup_pending = false;
+		if (dwc && dwc->current_dr_role == DWC3_GCTL_PRTCAP_DEVICE) {
+			pm_runtime_mark_last_busy(dwc->dev);
+			pm_runtime_put_autosuspend(dwc->dev);
+		}
+		enable_irq(dwc_imx->irq);
+	}
+
+	return ret;
+}
+
+static int __maybe_unused dwc3_imx8mp_pm_suspend(struct device *dev)
+{
+	struct dwc3_imx8mp *dwc_imx = dev_get_drvdata(dev);
+	int ret;
+
+	ret = dwc3_imx8mp_suspend(dwc_imx, PMSG_SUSPEND);
+
+	if (device_may_wakeup(dwc_imx->dev)) {
+		enable_irq_wake(dwc_imx->irq);
+	} else {
+		dwc_imx8mp_wakeup_disable_u3(dwc_imx);
+		clk_disable_unprepare(dwc_imx->suspend_clk);
+	}
+
+	clk_disable_unprepare(dwc_imx->hsio_clk);
+
+	return ret;
+}
+
+static int __maybe_unused dwc3_imx8mp_pm_resume(struct device *dev)
+{
+	struct dwc3_imx8mp *dwc_imx = dev_get_drvdata(dev);
+	int ret;
+
+	if (device_may_wakeup(dwc_imx->dev)) {
+		disable_irq_wake(dwc_imx->irq);
+	} else {
+		ret = clk_prepare_enable(dwc_imx->suspend_clk);
+		if (ret)
+			return ret;
+	}
+
+	ret = clk_prepare_enable(dwc_imx->hsio_clk);
+	if (ret)
+		return ret;
+
+	ret = dwc3_imx8mp_resume(dwc_imx, PMSG_RESUME);
+
+	pm_runtime_disable(dev);
+	pm_runtime_set_active(dev);
+	pm_runtime_enable(dev);
+
+	return ret;
+}
+
+static int __maybe_unused dwc3_imx8mp_runtime_suspend(struct device *dev)
+{
+	struct dwc3_imx8mp *dwc_imx = dev_get_drvdata(dev);
+
+	dev_dbg(dev, "dwc3 imx8mp runtime suspend.\n");
+
+	return dwc3_imx8mp_suspend(dwc_imx, PMSG_AUTO_SUSPEND);
+}
+
+static int __maybe_unused dwc3_imx8mp_runtime_resume(struct device *dev)
+{
+	struct dwc3_imx8mp *dwc_imx = dev_get_drvdata(dev);
+
+	dev_dbg(dev, "dwc3 imx8mp runtime resume.\n");
+
+	return dwc3_imx8mp_resume(dwc_imx, PMSG_AUTO_RESUME);
+}
+
+static const struct dev_pm_ops dwc3_imx8mp_dev_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(dwc3_imx8mp_pm_suspend, dwc3_imx8mp_pm_resume)
+	SET_RUNTIME_PM_OPS(dwc3_imx8mp_runtime_suspend,
+			   dwc3_imx8mp_runtime_resume, NULL)
+};
+
+static const struct of_device_id dwc_imx8mp_of_match[] = {
+	{ .compatible = "fsl,imx8mp-dwc3", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, dwc_imx8mp_of_match);
+
+static struct platform_driver dwc_imx8mp_driver = {
+	.probe		= dwc3_imx8mp_probe,
+	.remove		= dwc3_imx8mp_remove,
+	.driver		= {
+		.name	= "imx8mp-dwc3",
+		.pm	= &dwc3_imx8mp_dev_pm_ops,
+		.of_match_table	= dwc_imx8mp_of_match,
+	},
+};
+
+module_platform_driver(dwc_imx8mp_driver);
+
+MODULE_ALIAS("platform:imx8mp-dwc3");
+MODULE_AUTHOR("jun.li@nxp.com");
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("DesignWare USB3 imx8mp Glue Layer");