123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336 |
- // SPDX-License-Identifier: GPL-2.0
- /*
- * snps_udc_plat.c - Synopsys UDC Platform Driver
- *
- * Copyright (C) 2016 Broadcom
- */
- #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->virt_addr))
- return PTR_ERR(udc->virt_addr);
- /* 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");
|