@@ -0,0 +1,352 @@
+// 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 "core.h"
+
+/* USB wakeup registers */
+#define USB_WAKEUP_CTRL 0x00
+
+/* Global wakeup interrupt enable, also used to clear interrupt */
+#define USB_WAKEUP_EN BIT(31)
+/* Wakeup from connect or disconnect, 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_bulk_data *clks;
+ int num_clks;
+ int irq;
+ bool pm_suspended;
+ bool wakeup_pending;
+};
+
+static const struct clk_bulk_data dwc3_imx8mp_clks[] = {
+ { .id = "hsio" },
+ { .id = "bus" },
+ { .id = "suspend" },
+};
+
+static void dwc3_imx8mp_wakeup_enable(struct dwc3_imx8mp *dwc3_imx)
+{
+ struct dwc3 *dwc3 = platform_get_drvdata(dwc3_imx->dwc3);
+ u32 val;
+
+ if (!dwc3)
+ return;
+
+ val = readl(dwc3_imx->glue_base + USB_WAKEUP_CTRL);
+
+ if ((dwc3->current_dr_role == DWC3_GCTL_PRTCAP_HOST) && dwc3->xhci)
+ val |= USB_WAKEUP_EN | USB_WAKEUP_SS_CONN |
+ USB_WAKEUP_U3_EN | USB_WAKEUP_DPDM_EN;
+ else if (dwc3->current_dr_role == DWC3_GCTL_PRTCAP_DEVICE)
+ val |= USB_WAKEUP_EN | USB_WAKEUP_VBUS_EN |
+ USB_WAKEUP_VBUS_SRC_SESS_VAL;
+
+ writel(val, dwc3_imx->glue_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 &= ~(USB_WAKEUP_EN | USB_WAKEUP_EN_MASK);
+ writel(val, dwc3_imx->glue_base + USB_WAKEUP_CTRL);
+}
+
+static irqreturn_t dwc3_imx8mp_interrupt(int irq, void *_dwc3_imx)
+{
+ struct dwc3_imx8mp *dwc3_imx = _dwc3_imx;
+ struct dwc3 *dwc = platform_get_drvdata(dwc3_imx->dwc3);
+
+ if (!dwc3_imx->pm_suspended)
+ return IRQ_HANDLED;
+
+ disable_irq_nosync(dwc3_imx->irq);
+ dwc3_imx->wakeup_pending = true;
+
+ 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 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;
+ int err, irq;
+
+ if (!node) {
+ dev_err(dev, "device node not found\n");
+ return -EINVAL;
+ }
+
+ dwc3_imx = devm_kzalloc(dev, sizeof(*dwc3_imx), GFP_KERNEL);
+ if (!dwc3_imx)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, dwc3_imx);
+
+ 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->clks = devm_kmemdup(dev, dwc3_imx8mp_clks,
+ sizeof(dwc3_imx8mp_clks), GFP_KERNEL);
+ if (!dwc3_imx->clks)
+ return -ENOMEM;
+
+ dwc3_imx->num_clks = ARRAY_SIZE(dwc3_imx8mp_clks);
+ err = devm_clk_bulk_get(dev, dwc3_imx->num_clks, dwc3_imx->clks);
+ if (err) {
+ dev_err(dev, "Failed to request all necessary clocks\n");
+ return err;
+ }
+
+ err = clk_bulk_prepare_enable(dwc3_imx->num_clks, dwc3_imx->clks);
+ if (err)
+ return err;
+
+ /* Double enable suspend clk to keep it always on */
+ err = clk_prepare_enable(dwc3_imx->clks[dwc3_imx->num_clks-1].clk);
+ if (err)
+ goto disable_bulk_clk;
+
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0) {
+ err = irq;
+ goto disable_clks;
+ }
+ dwc3_imx->irq = irq;
+
+ err = devm_request_threaded_irq(dev, irq, NULL, dwc3_imx8mp_interrupt,
+ IRQF_ONESHOT, dev_name(dev), dwc3_imx);
+ if (err) {
+ dev_err(dev, "failed to request IRQ #%d --> %d\n", irq, err);
+ goto disable_clks;
+ }
+
+ pm_runtime_set_active(dev);
+ pm_runtime_enable(dev);
+ err = pm_runtime_get_sync(dev);
+ if (err < 0)
+ goto disable_rpm;
+
+ dwc3_np = of_get_child_by_name(node, "dwc3");
+ if (!dwc3_np) {
+ dev_err(dev, "failed to find dwc3 core child\n");
+ goto disable_rpm;
+ }
+
+ err = of_platform_populate(node, NULL, NULL, dev);
+ if (err) {
+ dev_err(&pdev->dev, "failed to create dwc3 core\n");
+ goto disable_rpm;
+ }
+
+ dwc3_imx->dwc3 = of_find_device_by_node(dwc3_np);
+ if (!dwc3_imx->dwc3) {
+ dev_err(dev, "failed to get dwc3 platform device\n");
+ err = -ENODEV;
+ goto depopulate;
+ }
+
+ device_set_wakeup_capable(dev, true);
+ pm_runtime_put(dev);
+
+ return 0;
+
+depopulate:
+ of_platform_depopulate(dev);
+disable_rpm:
+ pm_runtime_disable(dev);
+ pm_runtime_put_noidle(dev);
+disable_clks:
+ clk_disable_unprepare(dwc3_imx->clks[dwc3_imx->num_clks-1].clk);
+disable_bulk_clk:
+ clk_bulk_disable_unprepare(dwc3_imx->num_clks, dwc3_imx->clks);
+
+ return err;
+}
+
+static int dwc3_imx8mp_remove(struct platform_device *pdev)
+{
+ struct dwc3_imx8mp *dwc3_imx = platform_get_drvdata(pdev);
+ struct device *dev = &pdev->dev;
+
+ pm_runtime_get_sync(dev);
+ of_platform_depopulate(dev);
+
+ clk_bulk_disable_unprepare(dwc3_imx->num_clks, dwc3_imx->clks);
+ clk_disable_unprepare(dwc3_imx->clks[dwc3_imx->num_clks-1].clk);
+
+ pm_runtime_disable(dev);
+ pm_runtime_put_noidle(dev);
+ platform_set_drvdata(pdev, NULL);
+
+ return 0;
+}
+
+static int dwc3_imx8mp_suspend(struct dwc3_imx8mp *dwc3_imx, pm_message_t msg)
+{
+ if (dwc3_imx->pm_suspended)
+ return 0;
+
+ /* Wakeup enable */
+ if (PMSG_IS_AUTO(msg) || device_may_wakeup(dwc3_imx->dev))
+ dwc3_imx8mp_wakeup_enable(dwc3_imx);
+
+ clk_bulk_disable_unprepare(dwc3_imx->num_clks, dwc3_imx->clks);
+ dwc3_imx->pm_suspended = true;
+
+ return 0;
+}
+
+static int dwc3_imx8mp_resume(struct dwc3_imx8mp *dwc3_imx, pm_message_t msg)
+{
+ struct dwc3 *dwc = platform_get_drvdata(dwc3_imx->dwc3);
+ int ret = 0;
+
+ if (!dwc3_imx->pm_suspended)
+ return 0;
+
+ ret = clk_bulk_prepare_enable(dwc3_imx->num_clks, dwc3_imx->clks);
+ if (ret)
+ return ret;
+
+ /* Wakeup disable */
+ dwc3_imx8mp_wakeup_disable(dwc3_imx);
+ dwc3_imx->pm_suspended = false;
+
+ if (dwc3_imx->wakeup_pending) {
+ dwc3_imx->wakeup_pending = false;
+ if (dwc->current_dr_role == DWC3_GCTL_PRTCAP_DEVICE) {
+ pm_runtime_mark_last_busy(dwc->dev);
+ pm_runtime_put_autosuspend(dwc->dev);
+ } else {
+ /*
+ * Add wait for xhci switch from suspend
+ * clock to normal clock to detect connection.
+ */
+ usleep_range(9000, 10000);
+ }
+ enable_irq(dwc3_imx->irq);
+ }
+
+ return ret;
+}
+
+static int __maybe_unused dwc3_imx8mp_pm_suspend(struct device *dev)
+{
+ struct dwc3_imx8mp *dwc3_imx = dev_get_drvdata(dev);
+ int ret;
+
+ ret = dwc3_imx8mp_suspend(dwc3_imx, PMSG_SUSPEND);
+
+ if (device_may_wakeup(dwc3_imx->dev))
+ enable_irq_wake(dwc3_imx->irq);
+
+ dev_dbg(dev, "dwc3 imx8mp pm suspend.\n");
+
+ return ret;
+}
+
+static int __maybe_unused dwc3_imx8mp_pm_resume(struct device *dev)
+{
+ struct dwc3_imx8mp *dwc3_imx = dev_get_drvdata(dev);
+ int ret;
+
+ if (device_may_wakeup(dwc3_imx->dev))
+ disable_irq_wake(dwc3_imx->irq);
+
+ ret = dwc3_imx8mp_resume(dwc3_imx, PMSG_RESUME);
+
+ pm_runtime_disable(dev);
+ pm_runtime_set_active(dev);
+ pm_runtime_enable(dev);
+
+ dev_dbg(dev, "dwc3 imx8mp pm resume.\n");
+
+ return ret;
+}
+
+static int __maybe_unused dwc3_imx8mp_runtime_suspend(struct device *dev)
+{
+ struct dwc3_imx8mp *dwc3_imx = dev_get_drvdata(dev);
+
+ dev_dbg(dev, "dwc3 imx8mp runtime suspend.\n");
+
+ return dwc3_imx8mp_suspend(dwc3_imx, PMSG_AUTO_SUSPEND);
+}
+
+static int __maybe_unused dwc3_imx8mp_runtime_resume(struct device *dev)
+{
+ struct dwc3_imx8mp *dwc3_imx = dev_get_drvdata(dev);
+
+ dev_dbg(dev, "dwc3 imx8mp runtime resume.\n");
+
+ return dwc3_imx8mp_resume(dwc3_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 dwc3_imx8mp_of_match[] = {
+ { .compatible = "fsl,imx8mp-dwc3", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, dwc3_imx8mp_of_match);
+
+static struct platform_driver dwc3_imx8mp_driver = {
+ .probe = dwc3_imx8mp_probe,
+ .remove = dwc3_imx8mp_remove,
+ .driver = {
+ .name = "imx8mp-dwc3",
+ .pm = &dwc3_imx8mp_dev_pm_ops,
+ .of_match_table = dwc3_imx8mp_of_match,
+ },
+};
+
+module_platform_driver(dwc3_imx8mp_driver);
+
+MODULE_ALIAS("platform:imx8mp-dwc3");
+MODULE_AUTHOR("jun.li@nxp.com");
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("DesignWare USB3 imx8mp Glue Layer");