linux_dsm_epyc7002/drivers/usb/host/ehci-rtk.c

// SPDX-License-Identifier: GPL-1.0+
/*
 *  ehic-rtk.c RTK EHCI HCD (Host Controller Driver)
 *
 * Copyright (C) 2017 Realtek Semiconductor Corporation
 *
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/mbus.h>
#include <linux/clk.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_irq.h>
#include <linux/of_address.h>
#include <linux/usb.h>
#include <linux/usb/hcd.h>
#include <linux/io.h>
#include <linux/dma-mapping.h>
#include <linux/usb/phy.h>
#include <linux/of_gpio.h>
#include <linux/suspend.h>
#include <soc/realtek/rtk-usb-manager.h>

#include "ehci.h"

#define DRIVER_DESC "EHCI realtek driver"

static const char hcd_name[] = "ehci-rtk";

static struct hc_driver __read_mostly ehci_rtk_hc_driver;

static struct ehci_rtk {
	struct device *dev;
	struct usb_phy *phy;
	struct ehci_hcd *ehci;
	int irq;

	struct work_struct work;
};

#ifdef CONFIG_USB_PATCH_ON_RTK
#ifdef CONFIG_RTK_USB_RLE0599_PHY
extern void rtk_rle0599_phy_toggle(struct usb_phy *usb2_phy, bool isConnect);
#endif

int RTK_ehci_usb2_phy_toggle(struct device *hcd_dev, bool isConnect)
{
	struct usb_phy *phy = NULL;

	if (hcd_dev == NULL)
		return -ENODEV;

	phy = devm_usb_get_phy_by_phandle(hcd_dev, "usb-phy", 0);
	if (IS_ERR(phy)) {
		dev_err(hcd_dev, "No usb phy found\n");
		return -ENODEV;
	}

	dev_dbg(hcd_dev, "%s\n", __func__);
#ifdef CONFIG_RTK_USB_RLE0599_PHY
	if (phy != NULL)
		rtk_rle0599_phy_toggle(phy, isConnect);
#endif
	return 0;
}
#endif // CONFIG_USB_PATCH_ON_RTK

static void ehci_rtk_probe_work(struct work_struct *work)
{
	struct ehci_rtk *rtk = container_of(work, struct ehci_rtk, work);
	struct device		*dev = rtk->dev;
	struct usb_hcd *hcd = ehci_to_hcd(rtk->ehci);
	struct usb_phy *phy = rtk->phy;

	int irq = rtk->irq;
	int ret = 0;

	unsigned long probe_time = jiffies;

	dev_info(dev, "%s Start ...\n", __func__);

	usb_phy_init(phy);

	ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
	if (ret) {
		dev_err(dev, "%s: error add hcd\n", __func__);
		usb_put_hcd(hcd);
	}

	rtk_usb_init_port_power_on(dev);

	dev_info(dev, "%s End ... ok! (take %d ms)\n", __func__,
			jiffies_to_msecs(jiffies - probe_time));
}

static int ehci_rtk_drv_probe(struct platform_device *pdev)
{
	struct resource res;
	struct usb_hcd *hcd;
	struct ehci_hcd *ehci;
	void __iomem *regs;
	int irq, err = 0;
	struct usb_phy *phy;
	unsigned long probe_time = jiffies;

	if (usb_disabled())
		return -ENODEV;

	dev_info(&pdev->dev, "Probe Realtek-SoC USB EHCI Host Controller\n");

	//phy = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2);
	phy = devm_usb_get_phy_by_phandle(&pdev->dev, "usb-phy", 0);
	if (IS_ERR(phy)) {
		dev_err(&pdev->dev, "No usb phy found\n");
		return -ENODEV;
	}

	irq = irq_of_parse_and_map(pdev->dev.of_node, 0);
	if (irq <= 0) {
		dev_err(&pdev->dev,
			"Found HC with no IRQ. Check %s setup!\n",
			dev_name(&pdev->dev));
		err = -ENODEV;
		goto err1;
	}

	if (of_address_to_resource(pdev->dev.of_node, 0, &res)) {
		dev_err(&pdev->dev,
			"Found HC with no register addr. Check %s setup!\n",
			dev_name(&pdev->dev));
		err = -ENODEV;
		goto err1;
	}

	/*
	 * Right now device-tree probed devices don't get dma_mask
	 * set. Since shared usb code relies on it, set it here for
	 * now. Once we have dma capability bindings this can go away.
	 */
	if (!pdev->dev.dma_mask)
		pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
	if (!pdev->dev.coherent_dma_mask)
		pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);

	regs = of_iomap(pdev->dev.of_node, 0);
	if (regs == NULL) {
		dev_err(&pdev->dev, "error mapping memory\n");
		err = -EFAULT;
		goto err3;
	}

	if (readl(regs) == 0xdeadbeef) {
		dev_err(&pdev->dev, "%s error read ehci registers\n", __func__);
		err = -ENODEV;
		goto err3;
	}

	hcd = usb_create_hcd(&ehci_rtk_hc_driver,
			&pdev->dev, dev_name(&pdev->dev));
	if (!hcd) {
		err = -ENOMEM;
		goto err3;
	}

	hcd->rsrc_start = res.start;
	hcd->rsrc_len = resource_size(&res);
	hcd->regs = regs;

	ehci = hcd_to_ehci(hcd);
	ehci->caps = hcd->regs;

#ifdef CONFIG_USB_PATCH_ON_RTK
	if (of_property_read_bool(pdev->dev.of_node,
		    "fixed_async_list_addr_bug")) {
		dev_info(&pdev->dev, "%s Enable fixed_async_list_addr_bug\n",
			    __func__);
		ehci->fixed_async_list_addr_bug  = 1;
	}
#endif // CONFIG_USB_PATCH_ON_RTK

	if (of_property_read_bool(pdev->dev.of_node, "delay_probe_work")) {
		struct ehci_rtk *rtk;

		rtk = devm_kzalloc(&pdev->dev, sizeof(*rtk), GFP_KERNEL);
		if (!rtk) {
			err = -ENOMEM;
			goto err4;
		}
		rtk->dev = &pdev->dev;
		rtk->ehci = ehci;
		rtk->irq = irq;
		rtk->phy = phy;
		INIT_WORK(&rtk->work, ehci_rtk_probe_work);
		if (of_property_read_bool(pdev->dev.of_node, "ordered_probe"))
			rtk_usb_manager_schedule_work(&pdev->dev, &rtk->work);
		else
			schedule_work(&rtk->work);
	} else {
		usb_phy_init(phy);

		err = usb_add_hcd(hcd, irq, IRQF_SHARED);
		if (err) {
			dev_err(&pdev->dev, "error add hcd\n");
			goto err4;
		}
	}

	dev_info(&pdev->dev, "%s OK (take %d ms)\n", __func__,
		    jiffies_to_msecs(jiffies - probe_time));
	return 0;

err4:
	usb_put_hcd(hcd);
err3:
	irq_dispose_mapping(irq);
err1:
	dev_err(&pdev->dev, "%s: Probe %s fail, %d\n", __func__,
		dev_name(&pdev->dev), err);

	return err;

}

static int ehci_rtk_drv_remove(struct platform_device *pdev)
{
	struct usb_hcd *hcd = platform_get_drvdata(pdev);

	dev_set_drvdata(&pdev->dev, NULL);

	usb_remove_hcd(hcd);
	irq_dispose_mapping(hcd->irq);
	usb_put_hcd(hcd);

	return 0;
}

#ifdef CONFIG_USB_PATCH_ON_RTK
/* Add Workaround to fixed EHCI/OHCI Wrapper can't work simultaneously */
bool RTK_ehci_check_schedule_actived(const char *func)
{
	static struct ehci_hcd *ehci;
	struct device_node *node = NULL;
	struct platform_device *pdev = NULL;
	struct usb_hcd *hcd = NULL;
	bool connected = false;
	u32 status;

	if (ehci == NULL) {
		node = of_find_compatible_node(NULL, NULL,
			    "realtek,rtd129x-ehci");
		if (node != NULL)
			pdev = of_find_device_by_node(node);
		if (pdev != NULL) {
			hcd = platform_get_drvdata(pdev);
			ehci = hcd_to_ehci(hcd);
		}
	}
	if (ehci == NULL) {
		pr_debug("%s NO EHCI\n", __func__);
		return false;
	}
	status = ehci_readl(ehci, &ehci->regs->status);
	if (status & (STS_PSS | STS_ASS))
		connected = true;
	return connected;
}
#endif // CONFIG_USB_PATCH_ON_RTK

#ifdef CONFIG_SUSPEND
#ifdef CONFIG_USB_PATCH_ON_RTK
static int rtk_ehci_suspend(struct device *dev);
int RTK_rtk_ehci_suspend(struct device *dev)
{
	return rtk_ehci_suspend(dev);
}
#endif // CONFIG_USB_PATCH_ON_RTK

static int rtk_ehci_suspend(struct device *dev)
{
	struct usb_hcd *hcd = dev_get_drvdata(dev);
	struct platform_device *pdev = to_platform_device(dev);
	struct usb_phy *phy;
	bool do_wakeup = device_may_wakeup(dev);
	int rc = 0;

	dev_info(dev, "[USB] Enter %s", __func__);

#ifdef CONFIG_USB_PATCH_ON_RTK
#ifdef CONFIG_RTK_PLATFORM
	if (RTK_PM_STATE == PM_SUSPEND_STANDBY) {
		//For idle mode
		dev_info(dev, "[USB] %s Idle mode\n", __func__);
		goto out;
	}
	dev_info(dev, "[USB] %s Suspend mode\n", __func__);
#endif
#endif // CONFIG_USB_PATCH_ON_RTK

	rc = ehci_suspend(hcd, do_wakeup);

	phy = devm_usb_get_phy_by_phandle(&pdev->dev, "usb-phy", 0);
	if (IS_ERR(phy)) {
		dev_err(&pdev->dev, "No usb phy found\n");
		return -ENODEV;
	}

	usb_phy_shutdown(phy);

out:
	dev_info(dev, "[USB] Exit %s", __func__);
	return rc;
}

#ifdef CONFIG_USB_PATCH_ON_RTK
static int rtk_ehci_resume(struct device *dev);
int RTK_rtk_ehci_resume(struct device *dev)
{
	return rtk_ehci_resume(dev);
}
#endif // CONFIG_USB_PATCH_ON_RTK

static int rtk_ehci_resume(struct device *dev)
{
	struct usb_hcd *hcd = dev_get_drvdata(dev);
	struct platform_device *pdev = to_platform_device(dev);
	struct usb_phy *phy;

	dev_info(dev, "[USB] Enter %s", __func__);

#ifdef CONFIG_USB_PATCH_ON_RTK
#ifdef CONFIG_RTK_PLATFORM
	if (RTK_PM_STATE == PM_SUSPEND_STANDBY) {
		//For idle mode
		dev_info(dev, "[USB] %s Idle mode\n", __func__);
		goto out;
	}
	dev_info(dev, "[USB] %s Suspend mode\n", __func__);
#endif
#endif // CONFIG_USB_PATCH_ON_RTK

	phy = devm_usb_get_phy_by_phandle(&pdev->dev, "usb-phy", 0);
	if (IS_ERR(phy)) {
		dev_err(&pdev->dev, "No usb phy found\n");
		return -ENODEV;
	}

	usb_phy_init(phy);

	ehci_resume(hcd, false);

out:
	dev_info(dev, "[USB] Exit %s", __func__);
	return 0;
}

#else
#define rtk_ehci_suspend	NULL
#define rtk_ehci_resume		NULL
#endif

static const struct dev_pm_ops rtk_ehci_pm_ops = {
	SET_SYSTEM_SLEEP_PM_OPS(rtk_ehci_suspend, rtk_ehci_resume)
	//SET_LATE_SYSTEM_SLEEP_PM_OPS(rtk_ehci_suspend, rtk_ehci_resume)
};

static const struct of_device_id ehci_rtk_dt_ids[] = {
	{ .compatible = "realtek,rtk119x-ehci", },
	{ .compatible = "realtek,rtd129x-ehci", },
	{},
};
MODULE_DEVICE_TABLE(of, ehci_rtk_dt_ids);

static struct platform_driver ehci_rtk_driver = {
	.probe		= ehci_rtk_drv_probe,
	.remove		= ehci_rtk_drv_remove,
	.shutdown	= usb_hcd_platform_shutdown,
	.driver = {
		.name	= "rtk-ehci",
		.owner  = THIS_MODULE,
		.pm		= &rtk_ehci_pm_ops,
		.of_match_table = of_match_ptr(ehci_rtk_dt_ids),
	},
};

static int __init ehci_rtk_init(void)
{
	if (usb_disabled())
		return -ENODEV;

	pr_info("%s: " DRIVER_DESC " init\n", hcd_name);

	ehci_init_driver(&ehci_rtk_hc_driver, NULL);
	return platform_driver_register(&ehci_rtk_driver);
}
module_init(ehci_rtk_init);
//late_initcall_sync(ehci_rtk_init);

static void __exit ehci_rtk_cleanup(void)
{
	platform_driver_unregister(&ehci_rtk_driver);
}
module_exit(ehci_rtk_cleanup);

MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_ALIAS("platform:rtk-ehci");
MODULE_LICENSE("GPL");