drivers/usb/cdns3/cdns3-plat.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 /*
  * Cadence USBSS DRD Driver.
  *
  * Copyright (C) 2018-2020 Cadence.
  * Copyright (C) 2017-2018 NXP
  * Copyright (C) 2019 Texas Instruments
  *
  *
  * Author: Peter Chen <peter.chen@nxp.com>
  *         Pawel Laszczak <pawell@cadence.com>
  *         Roger Quadros <rogerq@ti.com>
  */

 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>

 #include "core.h"
 #include "gadget-export.h"
 #include "drd.h"

 static int set_phy_power_on(struct cdns *cdns)
 {
 	int ret;

 	ret = phy_power_on(cdns->usb2_phy);
 	if (ret)
 		return ret;

 	ret = phy_power_on(cdns->usb3_phy);
 	if (ret)
 		phy_power_off(cdns->usb2_phy);

 	return ret;
 }

 static void set_phy_power_off(struct cdns *cdns)
 {
 	phy_power_off(cdns->usb3_phy);
 	phy_power_off(cdns->usb2_phy);
 }

 /**
  * cdns3_plat_probe - probe for cdns3 core device
  * @pdev: Pointer to cdns3 core platform device
  *
  * Returns 0 on success otherwise negative errno
  */
 static int cdns3_plat_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct resource	*res;
 	struct cdns *cdns;
 	void __iomem *regs;
 	int ret;

 	cdns = devm_kzalloc(dev, sizeof(*cdns), GFP_KERNEL);
 	if (!cdns)
 		return -ENOMEM;

 	cdns->dev = dev;
 	cdns->pdata = dev_get_platdata(dev);

 	platform_set_drvdata(pdev, cdns);

 	res = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "host");
 	if (!res) {
 		dev_err(dev, "missing host IRQ\n");
 		return -ENODEV;
 	}

 	cdns->xhci_res[0] = *res;

 	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "xhci");
 	if (!res) {
 		dev_err(dev, "couldn't get xhci resource\n");
 		return -ENXIO;
 	}

 	cdns->xhci_res[1] = *res;

 	cdns->dev_irq = platform_get_irq_byname(pdev, "peripheral");

 	if (cdns->dev_irq < 0)
 		return cdns->dev_irq;

 	regs = devm_platform_ioremap_resource_byname(pdev, "dev");
 	if (IS_ERR(regs))
 		return PTR_ERR(regs);
 	cdns->dev_regs	= regs;

 	cdns->otg_irq = platform_get_irq_byname(pdev, "otg");
 	if (cdns->otg_irq < 0)
 		return cdns->otg_irq;

 	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "otg");
 	if (!res) {
 		dev_err(dev, "couldn't get otg resource\n");
 		return -ENXIO;
 	}

 	cdns->phyrst_a_enable = device_property_read_bool(dev, "cdns,phyrst-a-enable");

 	cdns->otg_res = *res;

 	cdns->wakeup_irq = platform_get_irq_byname_optional(pdev, "wakeup");
 	if (cdns->wakeup_irq == -EPROBE_DEFER)
 		return cdns->wakeup_irq;
 	else if (cdns->wakeup_irq == 0)
 		return -EINVAL;

 	if (cdns->wakeup_irq < 0) {
 		dev_dbg(dev, "couldn't get wakeup irq\n");
 		cdns->wakeup_irq = 0x0;
 	}

 	cdns->usb2_phy = devm_phy_optional_get(dev, "cdns3,usb2-phy");
 	if (IS_ERR(cdns->usb2_phy))
 		return PTR_ERR(cdns->usb2_phy);

 	ret = phy_init(cdns->usb2_phy);
 	if (ret)
 		return ret;

 	cdns->usb3_phy = devm_phy_optional_get(dev, "cdns3,usb3-phy");
 	if (IS_ERR(cdns->usb3_phy))
 		return PTR_ERR(cdns->usb3_phy);

 	ret = phy_init(cdns->usb3_phy);
 	if (ret)
 		goto err_phy3_init;

 	ret = set_phy_power_on(cdns);
 	if (ret)
 		goto err_phy_power_on;

 	cdns->gadget_init = cdns3_gadget_init;

 	ret = cdns_init(cdns);
 	if (ret)
 		goto err_cdns_init;

 	device_set_wakeup_capable(dev, true);
 	pm_runtime_set_active(dev);
 	pm_runtime_enable(dev);
 	if (!(cdns->pdata && (cdns->pdata->quirks & CDNS3_DEFAULT_PM_RUNTIME_ALLOW)))
 		pm_runtime_forbid(dev);

 	/*
 	 * The controller needs less time between bus and controller suspend,
 	 * and we also needs a small delay to avoid frequently entering low
 	 * power mode.
 	 */
 	pm_runtime_set_autosuspend_delay(dev, 20);
 	pm_runtime_mark_last_busy(dev);
 	pm_runtime_use_autosuspend(dev);

 	return 0;

 err_cdns_init:
 	set_phy_power_off(cdns);
 err_phy_power_on:
 	phy_exit(cdns->usb3_phy);
 err_phy3_init:
 	phy_exit(cdns->usb2_phy);

 	return ret;
 }

 /**
  * cdns3_plat_remove() - unbind drd driver and clean up
  * @pdev: Pointer to Linux platform device
  *
  * Returns 0 on success otherwise negative errno
  */
 static int cdns3_plat_remove(struct platform_device *pdev)
 {
 	struct cdns *cdns = platform_get_drvdata(pdev);
 	struct device *dev = cdns->dev;

 	pm_runtime_get_sync(dev);
 	pm_runtime_disable(dev);
 	pm_runtime_put_noidle(dev);
 	cdns_remove(cdns);
 	set_phy_power_off(cdns);
 	phy_exit(cdns->usb2_phy);
 	phy_exit(cdns->usb3_phy);
 	return 0;
 }

 #ifdef CONFIG_PM

 static int cdns3_set_platform_suspend(struct device *dev,
 				      bool suspend, bool wakeup)
 {
 	struct cdns *cdns = dev_get_drvdata(dev);
 	int ret = 0;

 	if (cdns->pdata && cdns->pdata->platform_suspend)
 		ret = cdns->pdata->platform_suspend(dev, suspend, wakeup);

 	return ret;
 }

 static int cdns3_controller_suspend(struct device *dev, pm_message_t msg)
 {
 	struct cdns *cdns = dev_get_drvdata(dev);
 	bool wakeup;
 	unsigned long flags;

 	if (cdns->in_lpm)
 		return 0;

 	if (PMSG_IS_AUTO(msg))
 		wakeup = true;
 	else
 		wakeup = device_may_wakeup(dev);

 	cdns3_set_platform_suspend(cdns->dev, true, wakeup);
 	set_phy_power_off(cdns);
 	spin_lock_irqsave(&cdns->lock, flags);
 	cdns->in_lpm = true;
 	spin_unlock_irqrestore(&cdns->lock, flags);
 	dev_dbg(cdns->dev, "%s ends\n", __func__);

 	return 0;
 }

 static int cdns3_controller_resume(struct device *dev, pm_message_t msg)
 {
 	struct cdns *cdns = dev_get_drvdata(dev);
 	int ret;
 	unsigned long flags;

 	if (!cdns->in_lpm)
 		return 0;

 	if (cdns_power_is_lost(cdns)) {
 		phy_exit(cdns->usb2_phy);
 		ret = phy_init(cdns->usb2_phy);
 		if (ret)
 			return ret;

 		phy_exit(cdns->usb3_phy);
 		ret = phy_init(cdns->usb3_phy);
 		if (ret)
 			return ret;
 	}

 	ret = set_phy_power_on(cdns);
 	if (ret)
 		return ret;

 	cdns3_set_platform_suspend(cdns->dev, false, false);

 	spin_lock_irqsave(&cdns->lock, flags);
 	cdns_resume(cdns, !PMSG_IS_AUTO(msg));
 	cdns->in_lpm = false;
 	spin_unlock_irqrestore(&cdns->lock, flags);
 	if (cdns->wakeup_pending) {
 		cdns->wakeup_pending = false;
 		enable_irq(cdns->wakeup_irq);
 	}
 	dev_dbg(cdns->dev, "%s ends\n", __func__);

 	return ret;
 }

 static int cdns3_plat_runtime_suspend(struct device *dev)
 {
 	return cdns3_controller_suspend(dev, PMSG_AUTO_SUSPEND);
 }

 static int cdns3_plat_runtime_resume(struct device *dev)
 {
 	return cdns3_controller_resume(dev, PMSG_AUTO_RESUME);
 }

 #ifdef CONFIG_PM_SLEEP

 static int cdns3_plat_suspend(struct device *dev)
 {
 	struct cdns *cdns = dev_get_drvdata(dev);
 	int ret;

 	cdns_suspend(cdns);

 	ret = cdns3_controller_suspend(dev, PMSG_SUSPEND);
 	if (ret)
 		return ret;

 	if (device_may_wakeup(dev) && cdns->wakeup_irq)
 		enable_irq_wake(cdns->wakeup_irq);

 	return ret;
 }

 static int cdns3_plat_resume(struct device *dev)
 {
 	return cdns3_controller_resume(dev, PMSG_RESUME);
 }
 #endif /* CONFIG_PM_SLEEP */
 #endif /* CONFIG_PM */

 static const struct dev_pm_ops cdns3_pm_ops = {
 	SET_SYSTEM_SLEEP_PM_OPS(cdns3_plat_suspend, cdns3_plat_resume)
 	SET_RUNTIME_PM_OPS(cdns3_plat_runtime_suspend,
 			   cdns3_plat_runtime_resume, NULL)
 };

 #ifdef CONFIG_OF
 static const struct of_device_id of_cdns3_match[] = {
 	{ .compatible = "cdns,usb3" },
 	{ },
 };
 MODULE_DEVICE_TABLE(of, of_cdns3_match);
 #endif

 static struct platform_driver cdns3_driver = {
 	.probe		= cdns3_plat_probe,
 	.remove		= cdns3_plat_remove,
 	.driver		= {
 		.name	= "cdns-usb3",
 		.of_match_table	= of_match_ptr(of_cdns3_match),
 		.pm	= &cdns3_pm_ops,
 	},
 };

 module_platform_driver(cdns3_driver);

 MODULE_ALIAS("platform:cdns3");
 MODULE_AUTHOR("Pawel Laszczak <pawell@cadence.com>");
 MODULE_LICENSE("GPL v2");
 MODULE_DESCRIPTION("Cadence USB3 DRD Controller Driver");
	// SPDX-License-Identifier: GPL-2.0
	/*
	* Cadence USBSS DRD Driver.
	*
	* Copyright (C) 2018-2020 Cadence.
	* Copyright (C) 2017-2018 NXP
	* Copyright (C) 2019 Texas Instruments
	*
	*
	* Author: Peter Chen <peter.chen@nxp.com>
	* Pawel Laszczak <pawell@cadence.com>
	* Roger Quadros <rogerq@ti.com>
	*/

	#include <linux/module.h>
	#include <linux/kernel.h>
	#include <linux/platform_device.h>
	#include <linux/pm_runtime.h>

	#include "core.h"
	#include "gadget-export.h"
	#include "drd.h"

	static int set_phy_power_on(struct cdns *cdns)
	{
	int ret;

	ret = phy_power_on(cdns->usb2_phy);
	if (ret)
	return ret;

	ret = phy_power_on(cdns->usb3_phy);
	if (ret)
	phy_power_off(cdns->usb2_phy);

	return ret;
	}

	static void set_phy_power_off(struct cdns *cdns)
	{
	phy_power_off(cdns->usb3_phy);
	phy_power_off(cdns->usb2_phy);
	}

	/**
	* cdns3_plat_probe - probe for cdns3 core device
	* @pdev: Pointer to cdns3 core platform device
	*
	* Returns 0 on success otherwise negative errno
	*/
	static int cdns3_plat_probe(struct platform_device *pdev)
	{
	struct device *dev = &pdev->dev;
	struct resource *res;
	struct cdns *cdns;
	void __iomem *regs;
	int ret;

	cdns = devm_kzalloc(dev, sizeof(*cdns), GFP_KERNEL);
	if (!cdns)
	return -ENOMEM;

	cdns->dev = dev;
	cdns->pdata = dev_get_platdata(dev);

	platform_set_drvdata(pdev, cdns);

	res = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "host");
	if (!res) {
	dev_err(dev, "missing host IRQ\n");
	return -ENODEV;
	}

	cdns->xhci_res[0] = *res;

	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "xhci");
	if (!res) {
	dev_err(dev, "couldn't get xhci resource\n");
	return -ENXIO;
	}

	cdns->xhci_res[1] = *res;

	cdns->dev_irq = platform_get_irq_byname(pdev, "peripheral");

	if (cdns->dev_irq < 0)
	return cdns->dev_irq;

	regs = devm_platform_ioremap_resource_byname(pdev, "dev");
	if (IS_ERR(regs))
	return PTR_ERR(regs);
	cdns->dev_regs = regs;

	cdns->otg_irq = platform_get_irq_byname(pdev, "otg");
	if (cdns->otg_irq < 0)
	return cdns->otg_irq;

	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "otg");
	if (!res) {
	dev_err(dev, "couldn't get otg resource\n");
	return -ENXIO;
	}

	cdns->phyrst_a_enable = device_property_read_bool(dev, "cdns,phyrst-a-enable");

	cdns->otg_res = *res;

	cdns->wakeup_irq = platform_get_irq_byname_optional(pdev, "wakeup");
	if (cdns->wakeup_irq == -EPROBE_DEFER)
	return cdns->wakeup_irq;
	else if (cdns->wakeup_irq == 0)
	return -EINVAL;

	if (cdns->wakeup_irq < 0) {
	dev_dbg(dev, "couldn't get wakeup irq\n");
	cdns->wakeup_irq = 0x0;
	}

	cdns->usb2_phy = devm_phy_optional_get(dev, "cdns3,usb2-phy");
	if (IS_ERR(cdns->usb2_phy))
	return PTR_ERR(cdns->usb2_phy);

	ret = phy_init(cdns->usb2_phy);
	if (ret)
	return ret;

	cdns->usb3_phy = devm_phy_optional_get(dev, "cdns3,usb3-phy");
	if (IS_ERR(cdns->usb3_phy))
	return PTR_ERR(cdns->usb3_phy);

	ret = phy_init(cdns->usb3_phy);
	if (ret)
	goto err_phy3_init;

	ret = set_phy_power_on(cdns);
	if (ret)
	goto err_phy_power_on;

	cdns->gadget_init = cdns3_gadget_init;

	ret = cdns_init(cdns);
	if (ret)
	goto err_cdns_init;

	device_set_wakeup_capable(dev, true);
	pm_runtime_set_active(dev);
	pm_runtime_enable(dev);
	if (!(cdns->pdata && (cdns->pdata->quirks & CDNS3_DEFAULT_PM_RUNTIME_ALLOW)))
	pm_runtime_forbid(dev);

	/*
	* The controller needs less time between bus and controller suspend,
	* and we also needs a small delay to avoid frequently entering low
	* power mode.
	*/
	pm_runtime_set_autosuspend_delay(dev, 20);
	pm_runtime_mark_last_busy(dev);
	pm_runtime_use_autosuspend(dev);

	return 0;

	err_cdns_init:
	set_phy_power_off(cdns);
	err_phy_power_on:
	phy_exit(cdns->usb3_phy);
	err_phy3_init:
	phy_exit(cdns->usb2_phy);

	return ret;
	}

	/**
	* cdns3_plat_remove() - unbind drd driver and clean up
	* @pdev: Pointer to Linux platform device
	*
	* Returns 0 on success otherwise negative errno
	*/
	static int cdns3_plat_remove(struct platform_device *pdev)
	{
	struct cdns *cdns = platform_get_drvdata(pdev);
	struct device *dev = cdns->dev;

	pm_runtime_get_sync(dev);
	pm_runtime_disable(dev);
	pm_runtime_put_noidle(dev);
	cdns_remove(cdns);
	set_phy_power_off(cdns);
	phy_exit(cdns->usb2_phy);
	phy_exit(cdns->usb3_phy);
	return 0;
	}

	#ifdef CONFIG_PM

	static int cdns3_set_platform_suspend(struct device *dev,
	bool suspend, bool wakeup)
	{
	struct cdns *cdns = dev_get_drvdata(dev);
	int ret = 0;

	if (cdns->pdata && cdns->pdata->platform_suspend)
	ret = cdns->pdata->platform_suspend(dev, suspend, wakeup);

	return ret;
	}

	static int cdns3_controller_suspend(struct device *dev, pm_message_t msg)
	{
	struct cdns *cdns = dev_get_drvdata(dev);
	bool wakeup;
	unsigned long flags;

	if (cdns->in_lpm)
	return 0;

	if (PMSG_IS_AUTO(msg))
	wakeup = true;
	else
	wakeup = device_may_wakeup(dev);

	cdns3_set_platform_suspend(cdns->dev, true, wakeup);
	set_phy_power_off(cdns);
	spin_lock_irqsave(&cdns->lock, flags);
	cdns->in_lpm = true;
	spin_unlock_irqrestore(&cdns->lock, flags);
	dev_dbg(cdns->dev, "%s ends\n", __func__);

	return 0;
	}

	static int cdns3_controller_resume(struct device *dev, pm_message_t msg)
	{
	struct cdns *cdns = dev_get_drvdata(dev);
	int ret;
	unsigned long flags;

	if (!cdns->in_lpm)
	return 0;

	if (cdns_power_is_lost(cdns)) {
	phy_exit(cdns->usb2_phy);
	ret = phy_init(cdns->usb2_phy);
	if (ret)
	return ret;

	phy_exit(cdns->usb3_phy);
	ret = phy_init(cdns->usb3_phy);
	if (ret)
	return ret;
	}

	ret = set_phy_power_on(cdns);
	if (ret)
	return ret;

	cdns3_set_platform_suspend(cdns->dev, false, false);

	spin_lock_irqsave(&cdns->lock, flags);
	cdns_resume(cdns, !PMSG_IS_AUTO(msg));
	cdns->in_lpm = false;
	spin_unlock_irqrestore(&cdns->lock, flags);
	if (cdns->wakeup_pending) {
	cdns->wakeup_pending = false;
	enable_irq(cdns->wakeup_irq);
	}
	dev_dbg(cdns->dev, "%s ends\n", __func__);

	return ret;
	}

	static int cdns3_plat_runtime_suspend(struct device *dev)
	{
	return cdns3_controller_suspend(dev, PMSG_AUTO_SUSPEND);
	}

	static int cdns3_plat_runtime_resume(struct device *dev)
	{
	return cdns3_controller_resume(dev, PMSG_AUTO_RESUME);
	}

	#ifdef CONFIG_PM_SLEEP

	static int cdns3_plat_suspend(struct device *dev)
	{
	struct cdns *cdns = dev_get_drvdata(dev);
	int ret;

	cdns_suspend(cdns);

	ret = cdns3_controller_suspend(dev, PMSG_SUSPEND);
	if (ret)
	return ret;

	if (device_may_wakeup(dev) && cdns->wakeup_irq)
	enable_irq_wake(cdns->wakeup_irq);

	return ret;
	}

	static int cdns3_plat_resume(struct device *dev)
	{
	return cdns3_controller_resume(dev, PMSG_RESUME);
	}
	#endif /* CONFIG_PM_SLEEP */
	#endif /* CONFIG_PM */

	static const struct dev_pm_ops cdns3_pm_ops = {
	SET_SYSTEM_SLEEP_PM_OPS(cdns3_plat_suspend, cdns3_plat_resume)
	SET_RUNTIME_PM_OPS(cdns3_plat_runtime_suspend,
	cdns3_plat_runtime_resume, NULL)
	};

	#ifdef CONFIG_OF
	static const struct of_device_id of_cdns3_match[] = {
	{ .compatible = "cdns,usb3" },
	{ },
	};
	MODULE_DEVICE_TABLE(of, of_cdns3_match);
	#endif

	static struct platform_driver cdns3_driver = {
	.probe = cdns3_plat_probe,
	.remove = cdns3_plat_remove,
	.driver = {
	.name = "cdns-usb3",
	.of_match_table = of_match_ptr(of_cdns3_match),
	.pm = &cdns3_pm_ops,
	},
	};

	module_platform_driver(cdns3_driver);

	MODULE_ALIAS("platform:cdns3");
	MODULE_AUTHOR("Pawel Laszczak <pawell@cadence.com>");
	MODULE_LICENSE("GPL v2");
	MODULE_DESCRIPTION("Cadence USB3 DRD Controller Driver");