drivers/usb/gadget/udc/snps_udc_plat.c - arm/linux - Git at Google

 /*
  * snps_udc_plat.c - Synopsys UDC Platform Driver
  *
  * Copyright (C) 2016 Broadcom
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License as
  * published by the Free Software Foundation version 2.
  *
  * This program is distributed "as is" WITHOUT ANY WARRANTY of any
  * kind, whether express or implied; without even the implied warranty
  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  */

 #include <linux/extcon.h>
 #include <linux/of_address.h>
 #include <linux/of_irq.h>
 #include <linux/of_gpio.h>
 #include <linux/platform_device.h>
 #include <linux/phy/phy.h>
 #include <linux/module.h>
 #include <linux/dmapool.h>
 #include <linux/interrupt.h>
 #include <linux/moduleparam.h>
 #include "amd5536udc.h"

 /* description */
 #define UDC_MOD_DESCRIPTION     "Synopsys UDC platform driver"

 static void start_udc(struct udc *udc)
 {
 	if (udc->driver) {
 		dev_info(udc->dev, "Connecting...\n");
 		udc_enable_dev_setup_interrupts(udc);
 		udc_basic_init(udc);
 		udc->connected = 1;
 	}
 }

 static void stop_udc(struct udc *udc)
 {
 	int tmp;
 	u32 reg;

 	spin_lock(&udc->lock);

 	/* Flush the receieve fifo */
 	reg = readl(&udc->regs->ctl);
 	reg |= AMD_BIT(UDC_DEVCTL_SRX_FLUSH);
 	writel(reg, &udc->regs->ctl);

 	reg = readl(&udc->regs->ctl);
 	reg &= ~(AMD_BIT(UDC_DEVCTL_SRX_FLUSH));
 	writel(reg, &udc->regs->ctl);
 	dev_dbg(udc->dev, "ep rx queue flushed\n");

 	/* Mask interrupts. Required more so when the
 	 * UDC is connected to a DRD phy.
 	 */
 	udc_mask_unused_interrupts(udc);

 	/* Disconnect gadget driver */
 	if (udc->driver) {
 		spin_unlock(&udc->lock);
 		udc->driver->disconnect(&udc->gadget);
 		spin_lock(&udc->lock);

 		/* empty queues */
 		for (tmp = 0; tmp < UDC_EP_NUM; tmp++)
 			empty_req_queue(&udc->ep[tmp]);
 	}
 	udc->connected = 0;

 	spin_unlock(&udc->lock);
 	dev_info(udc->dev, "Device disconnected\n");
 }

 static void udc_drd_work(struct work_struct *work)
 {
 	struct udc *udc;

 	udc = container_of(to_delayed_work(work),
 			   struct udc, drd_work);

 	if (udc->conn_type) {
 		dev_dbg(udc->dev, "idle -> device\n");
 		start_udc(udc);
 	} else {
 		dev_dbg(udc->dev, "device -> idle\n");
 		stop_udc(udc);
 	}
 }

 static int usbd_connect_notify(struct notifier_block *self,
 			       unsigned long event, void *ptr)
 {
 	struct udc *udc = container_of(self, struct udc, nb);

 	dev_dbg(udc->dev, "%s: event: %lu\n", __func__, event);

 	udc->conn_type = event;

 	schedule_delayed_work(&udc->drd_work, 0);

 	return NOTIFY_OK;
 }

 static int udc_plat_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct resource *res;
 	struct udc *udc;
 	int ret;

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

 	spin_lock_init(&udc->lock);
 	udc->dev = dev;

 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	udc->virt_addr = devm_ioremap_resource(dev, res);
 	if (IS_ERR(udc->regs))
 		return PTR_ERR(udc->regs);

 	/* udc csr registers base */
 	udc->csr = udc->virt_addr + UDC_CSR_ADDR;

 	/* dev registers base */
 	udc->regs = udc->virt_addr + UDC_DEVCFG_ADDR;

 	/* ep registers base */
 	udc->ep_regs = udc->virt_addr + UDC_EPREGS_ADDR;

 	/* fifo's base */
 	udc->rxfifo = (u32 __iomem *)(udc->virt_addr + UDC_RXFIFO_ADDR);
 	udc->txfifo = (u32 __iomem *)(udc->virt_addr + UDC_TXFIFO_ADDR);

 	udc->phys_addr = (unsigned long)res->start;

 	udc->irq = irq_of_parse_and_map(dev->of_node, 0);
 	if (udc->irq <= 0) {
 		dev_err(dev, "Can't parse and map interrupt\n");
 		return -EINVAL;
 	}

 	udc->udc_phy = devm_of_phy_get_by_index(dev, dev->of_node, 0);
 	if (IS_ERR(udc->udc_phy)) {
 		dev_err(dev, "Failed to obtain phy from device tree\n");
 		return PTR_ERR(udc->udc_phy);
 	}

 	ret = phy_init(udc->udc_phy);
 	if (ret) {
 		dev_err(dev, "UDC phy init failed");
 		return ret;
 	}

 	ret = phy_power_on(udc->udc_phy);
 	if (ret) {
 		dev_err(dev, "UDC phy power on failed");
 		phy_exit(udc->udc_phy);
 		return ret;
 	}

 	/* Register for extcon if supported */
 	if (of_get_property(dev->of_node, "extcon", NULL)) {
 		udc->edev = extcon_get_edev_by_phandle(dev, 0);
 		if (IS_ERR(udc->edev)) {
 			if (PTR_ERR(udc->edev) == -EPROBE_DEFER)
 				return -EPROBE_DEFER;
 			dev_err(dev, "Invalid or missing extcon\n");
 			ret = PTR_ERR(udc->edev);
 			goto exit_phy;
 		}

 		udc->nb.notifier_call = usbd_connect_notify;
 		ret = extcon_register_notifier(udc->edev, EXTCON_USB,
 					       &udc->nb);
 		if (ret < 0) {
 			dev_err(dev, "Can't register extcon device\n");
 			goto exit_phy;
 		}

 		ret = extcon_get_state(udc->edev, EXTCON_USB);
 		if (ret < 0) {
 			dev_err(dev, "Can't get cable state\n");
 			goto exit_extcon;
 		} else if (ret) {
 			udc->conn_type = ret;
 		}
 		INIT_DELAYED_WORK(&udc->drd_work, udc_drd_work);
 	}

 	/* init dma pools */
 	if (use_dma) {
 		ret = init_dma_pools(udc);
 		if (ret != 0)
 			goto exit_extcon;
 	}

 	ret = devm_request_irq(dev, udc->irq, udc_irq, IRQF_SHARED,
 			       "snps-udc", udc);
 	if (ret < 0) {
 		dev_err(dev, "Request irq %d failed for UDC\n", udc->irq);
 		goto exit_dma;
 	}

 	platform_set_drvdata(pdev, udc);
 	udc->chiprev = UDC_BCM_REV;

 	if (udc_probe(udc)) {
 		ret = -ENODEV;
 		goto exit_dma;
 	}
 	dev_info(dev, "Synopsys UDC platform driver probe successful\n");

 	return 0;

 exit_dma:
 	if (use_dma)
 		free_dma_pools(udc);
 exit_extcon:
 	if (udc->edev)
 		extcon_unregister_notifier(udc->edev, EXTCON_USB, &udc->nb);
 exit_phy:
 	if (udc->udc_phy) {
 		phy_power_off(udc->udc_phy);
 		phy_exit(udc->udc_phy);
 	}
 	return ret;
 }

 static int udc_plat_remove(struct platform_device *pdev)
 {
 	struct udc *dev;

 	dev = platform_get_drvdata(pdev);

 	usb_del_gadget_udc(&dev->gadget);
 	/* gadget driver must not be registered */
 	if (WARN_ON(dev->driver))
 		return 0;

 	/* dma pool cleanup */
 	free_dma_pools(dev);

 	udc_remove(dev);

 	platform_set_drvdata(pdev, NULL);

 	if (dev->drd_wq) {
 		flush_workqueue(dev->drd_wq);
 		destroy_workqueue(dev->drd_wq);
 	}

 	phy_power_off(dev->udc_phy);
 	phy_exit(dev->udc_phy);
 	extcon_unregister_notifier(dev->edev, EXTCON_USB, &dev->nb);

 	dev_info(&pdev->dev, "Synopsys UDC platform driver removed\n");

 	return 0;
 }

 #ifdef CONFIG_PM_SLEEP
 static int udc_plat_suspend(struct device *dev)
 {
 	struct udc *udc;

 	udc = dev_get_drvdata(dev);
 	stop_udc(udc);

 	if (extcon_get_state(udc->edev, EXTCON_USB) > 0) {
 		dev_dbg(udc->dev, "device -> idle\n");
 		stop_udc(udc);
 	}
 	phy_power_off(udc->udc_phy);
 	phy_exit(udc->udc_phy);

 	return 0;
 }

 static int udc_plat_resume(struct device *dev)
 {
 	struct udc *udc;
 	int ret;

 	udc = dev_get_drvdata(dev);

 	ret = phy_init(udc->udc_phy);
 	if (ret) {
 		dev_err(udc->dev, "UDC phy init failure");
 		return ret;
 	}

 	ret = phy_power_on(udc->udc_phy);
 	if (ret) {
 		dev_err(udc->dev, "UDC phy power on failure");
 		phy_exit(udc->udc_phy);
 		return ret;
 	}

 	if (extcon_get_state(udc->edev, EXTCON_USB) > 0) {
 		dev_dbg(udc->dev, "idle -> device\n");
 		start_udc(udc);
 	}

 	return 0;
 }
 static const struct dev_pm_ops udc_plat_pm_ops = {
 	.suspend	= udc_plat_suspend,
 	.resume		= udc_plat_resume,
 };
 #endif

 #if defined(CONFIG_OF)
 static const struct of_device_id of_udc_match[] = {
 	{ .compatible = "brcm,ns2-udc", },
 	{ .compatible = "brcm,cygnus-udc", },
 	{ .compatible = "brcm,iproc-udc", },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, of_udc_match);
 #endif

 static struct platform_driver udc_plat_driver = {
 	.probe		= udc_plat_probe,
 	.remove		= udc_plat_remove,
 	.driver		= {
 		.name	= "snps-udc-plat",
 		.of_match_table = of_match_ptr(of_udc_match),
 #ifdef CONFIG_PM_SLEEP
 		.pm	= &udc_plat_pm_ops,
 #endif
 	},
 };
 module_platform_driver(udc_plat_driver);

 MODULE_DESCRIPTION(UDC_MOD_DESCRIPTION);
 MODULE_AUTHOR("Broadcom");
 MODULE_LICENSE("GPL v2");
	/*
	* snps_udc_plat.c - Synopsys UDC Platform Driver
	*
	* Copyright (C) 2016 Broadcom
	*
	* This program is free software; you can redistribute it and/or
	* modify it under the terms of the GNU General Public License as
	* published by the Free Software Foundation version 2.
	*
	* This program is distributed "as is" WITHOUT ANY WARRANTY of any
	* kind, whether express or implied; without even the implied warranty
	* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*/

	#include <linux/extcon.h>
	#include <linux/of_address.h>
	#include <linux/of_irq.h>
	#include <linux/of_gpio.h>
	#include <linux/platform_device.h>
	#include <linux/phy/phy.h>
	#include <linux/module.h>
	#include <linux/dmapool.h>
	#include <linux/interrupt.h>
	#include <linux/moduleparam.h>
	#include "amd5536udc.h"

	/* description */
	#define UDC_MOD_DESCRIPTION "Synopsys UDC platform driver"

	static void start_udc(struct udc *udc)
	{
	if (udc->driver) {
	dev_info(udc->dev, "Connecting...\n");
	udc_enable_dev_setup_interrupts(udc);
	udc_basic_init(udc);
	udc->connected = 1;
	}
	}

	static void stop_udc(struct udc *udc)
	{
	int tmp;
	u32 reg;

	spin_lock(&udc->lock);

	/* Flush the receieve fifo */
	reg = readl(&udc->regs->ctl);
	reg \|= AMD_BIT(UDC_DEVCTL_SRX_FLUSH);
	writel(reg, &udc->regs->ctl);

	reg = readl(&udc->regs->ctl);
	reg &= ~(AMD_BIT(UDC_DEVCTL_SRX_FLUSH));
	writel(reg, &udc->regs->ctl);
	dev_dbg(udc->dev, "ep rx queue flushed\n");

	/* Mask interrupts. Required more so when the
	* UDC is connected to a DRD phy.
	*/
	udc_mask_unused_interrupts(udc);

	/* Disconnect gadget driver */
	if (udc->driver) {
	spin_unlock(&udc->lock);
	udc->driver->disconnect(&udc->gadget);
	spin_lock(&udc->lock);

	/* empty queues */
	for (tmp = 0; tmp < UDC_EP_NUM; tmp++)
	empty_req_queue(&udc->ep[tmp]);
	}
	udc->connected = 0;

	spin_unlock(&udc->lock);
	dev_info(udc->dev, "Device disconnected\n");
	}

	static void udc_drd_work(struct work_struct *work)
	{
	struct udc *udc;

	udc = container_of(to_delayed_work(work),
	struct udc, drd_work);

	if (udc->conn_type) {
	dev_dbg(udc->dev, "idle -> device\n");
	start_udc(udc);
	} else {
	dev_dbg(udc->dev, "device -> idle\n");
	stop_udc(udc);
	}
	}

	static int usbd_connect_notify(struct notifier_block *self,
	unsigned long event, void *ptr)
	{
	struct udc *udc = container_of(self, struct udc, nb);

	dev_dbg(udc->dev, "%s: event: %lu\n", __func__, event);

	udc->conn_type = event;

	schedule_delayed_work(&udc->drd_work, 0);

	return NOTIFY_OK;
	}

	static int udc_plat_probe(struct platform_device *pdev)
	{
	struct device *dev = &pdev->dev;
	struct resource *res;
	struct udc *udc;
	int ret;

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

	spin_lock_init(&udc->lock);
	udc->dev = dev;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	udc->virt_addr = devm_ioremap_resource(dev, res);
	if (IS_ERR(udc->regs))
	return PTR_ERR(udc->regs);

	/* udc csr registers base */
	udc->csr = udc->virt_addr + UDC_CSR_ADDR;

	/* dev registers base */
	udc->regs = udc->virt_addr + UDC_DEVCFG_ADDR;

	/* ep registers base */
	udc->ep_regs = udc->virt_addr + UDC_EPREGS_ADDR;

	/* fifo's base */
	udc->rxfifo = (u32 __iomem *)(udc->virt_addr + UDC_RXFIFO_ADDR);
	udc->txfifo = (u32 __iomem *)(udc->virt_addr + UDC_TXFIFO_ADDR);

	udc->phys_addr = (unsigned long)res->start;

	udc->irq = irq_of_parse_and_map(dev->of_node, 0);
	if (udc->irq <= 0) {
	dev_err(dev, "Can't parse and map interrupt\n");
	return -EINVAL;
	}

	udc->udc_phy = devm_of_phy_get_by_index(dev, dev->of_node, 0);
	if (IS_ERR(udc->udc_phy)) {
	dev_err(dev, "Failed to obtain phy from device tree\n");
	return PTR_ERR(udc->udc_phy);
	}

	ret = phy_init(udc->udc_phy);
	if (ret) {
	dev_err(dev, "UDC phy init failed");
	return ret;
	}

	ret = phy_power_on(udc->udc_phy);
	if (ret) {
	dev_err(dev, "UDC phy power on failed");
	phy_exit(udc->udc_phy);
	return ret;
	}

	/* Register for extcon if supported */
	if (of_get_property(dev->of_node, "extcon", NULL)) {
	udc->edev = extcon_get_edev_by_phandle(dev, 0);
	if (IS_ERR(udc->edev)) {
	if (PTR_ERR(udc->edev) == -EPROBE_DEFER)
	return -EPROBE_DEFER;
	dev_err(dev, "Invalid or missing extcon\n");
	ret = PTR_ERR(udc->edev);
	goto exit_phy;
	}

	udc->nb.notifier_call = usbd_connect_notify;
	ret = extcon_register_notifier(udc->edev, EXTCON_USB,
	&udc->nb);
	if (ret < 0) {
	dev_err(dev, "Can't register extcon device\n");
	goto exit_phy;
	}

	ret = extcon_get_state(udc->edev, EXTCON_USB);
	if (ret < 0) {
	dev_err(dev, "Can't get cable state\n");
	goto exit_extcon;
	} else if (ret) {
	udc->conn_type = ret;
	}
	INIT_DELAYED_WORK(&udc->drd_work, udc_drd_work);
	}

	/* init dma pools */
	if (use_dma) {
	ret = init_dma_pools(udc);
	if (ret != 0)
	goto exit_extcon;
	}

	ret = devm_request_irq(dev, udc->irq, udc_irq, IRQF_SHARED,
	"snps-udc", udc);
	if (ret < 0) {
	dev_err(dev, "Request irq %d failed for UDC\n", udc->irq);
	goto exit_dma;
	}

	platform_set_drvdata(pdev, udc);
	udc->chiprev = UDC_BCM_REV;

	if (udc_probe(udc)) {
	ret = -ENODEV;
	goto exit_dma;
	}
	dev_info(dev, "Synopsys UDC platform driver probe successful\n");

	return 0;

	exit_dma:
	if (use_dma)
	free_dma_pools(udc);
	exit_extcon:
	if (udc->edev)
	extcon_unregister_notifier(udc->edev, EXTCON_USB, &udc->nb);
	exit_phy:
	if (udc->udc_phy) {
	phy_power_off(udc->udc_phy);
	phy_exit(udc->udc_phy);
	}
	return ret;
	}

	static int udc_plat_remove(struct platform_device *pdev)
	{
	struct udc *dev;

	dev = platform_get_drvdata(pdev);

	usb_del_gadget_udc(&dev->gadget);
	/* gadget driver must not be registered */
	if (WARN_ON(dev->driver))
	return 0;

	/* dma pool cleanup */
	free_dma_pools(dev);

	udc_remove(dev);

	platform_set_drvdata(pdev, NULL);

	if (dev->drd_wq) {
	flush_workqueue(dev->drd_wq);
	destroy_workqueue(dev->drd_wq);
	}

	phy_power_off(dev->udc_phy);
	phy_exit(dev->udc_phy);
	extcon_unregister_notifier(dev->edev, EXTCON_USB, &dev->nb);

	dev_info(&pdev->dev, "Synopsys UDC platform driver removed\n");

	return 0;
	}

	#ifdef CONFIG_PM_SLEEP
	static int udc_plat_suspend(struct device *dev)
	{
	struct udc *udc;

	udc = dev_get_drvdata(dev);
	stop_udc(udc);

	if (extcon_get_state(udc->edev, EXTCON_USB) > 0) {
	dev_dbg(udc->dev, "device -> idle\n");
	stop_udc(udc);
	}
	phy_power_off(udc->udc_phy);
	phy_exit(udc->udc_phy);

	return 0;
	}

	static int udc_plat_resume(struct device *dev)
	{
	struct udc *udc;
	int ret;

	udc = dev_get_drvdata(dev);

	ret = phy_init(udc->udc_phy);
	if (ret) {
	dev_err(udc->dev, "UDC phy init failure");
	return ret;
	}

	ret = phy_power_on(udc->udc_phy);
	if (ret) {
	dev_err(udc->dev, "UDC phy power on failure");
	phy_exit(udc->udc_phy);
	return ret;
	}

	if (extcon_get_state(udc->edev, EXTCON_USB) > 0) {
	dev_dbg(udc->dev, "idle -> device\n");
	start_udc(udc);
	}

	return 0;
	}
	static const struct dev_pm_ops udc_plat_pm_ops = {
	.suspend = udc_plat_suspend,
	.resume = udc_plat_resume,
	};
	#endif

	#if defined(CONFIG_OF)
	static const struct of_device_id of_udc_match[] = {
	{ .compatible = "brcm,ns2-udc", },
	{ .compatible = "brcm,cygnus-udc", },
	{ .compatible = "brcm,iproc-udc", },
	{ }
	};
	MODULE_DEVICE_TABLE(of, of_udc_match);
	#endif

	static struct platform_driver udc_plat_driver = {
	.probe = udc_plat_probe,
	.remove = udc_plat_remove,
	.driver = {
	.name = "snps-udc-plat",
	.of_match_table = of_match_ptr(of_udc_match),
	#ifdef CONFIG_PM_SLEEP
	.pm = &udc_plat_pm_ops,
	#endif
	},
	};
	module_platform_driver(udc_plat_driver);

	MODULE_DESCRIPTION(UDC_MOD_DESCRIPTION);
	MODULE_AUTHOR("Broadcom");
	MODULE_LICENSE("GPL v2");