1 // SPDX-License-Identifier: GPL-2.0
3 * snps_udc_plat.c - Synopsys UDC Platform Driver
5 * Copyright (C) 2016 Broadcom
8 #include <linux/extcon.h>
9 #include <linux/of_address.h>
10 #include <linux/of_irq.h>
11 #include <linux/of_gpio.h>
12 #include <linux/platform_device.h>
13 #include <linux/phy/phy.h>
14 #include <linux/module.h>
15 #include <linux/dmapool.h>
16 #include <linux/interrupt.h>
17 #include <linux/moduleparam.h>
18 #include "amd5536udc.h"
21 #define UDC_MOD_DESCRIPTION "Synopsys UDC platform driver"
23 static void start_udc(struct udc *udc)
26 dev_info(udc->dev, "Connecting...\n");
27 udc_enable_dev_setup_interrupts(udc);
33 static void stop_udc(struct udc *udc)
38 spin_lock(&udc->lock);
40 /* Flush the receieve fifo */
41 reg = readl(&udc->regs->ctl);
42 reg |= AMD_BIT(UDC_DEVCTL_SRX_FLUSH);
43 writel(reg, &udc->regs->ctl);
45 reg = readl(&udc->regs->ctl);
46 reg &= ~(AMD_BIT(UDC_DEVCTL_SRX_FLUSH));
47 writel(reg, &udc->regs->ctl);
48 dev_dbg(udc->dev, "ep rx queue flushed\n");
50 /* Mask interrupts. Required more so when the
51 * UDC is connected to a DRD phy.
53 udc_mask_unused_interrupts(udc);
55 /* Disconnect gadget driver */
57 spin_unlock(&udc->lock);
58 udc->driver->disconnect(&udc->gadget);
59 spin_lock(&udc->lock);
62 for (tmp = 0; tmp < UDC_EP_NUM; tmp++)
63 empty_req_queue(&udc->ep[tmp]);
67 spin_unlock(&udc->lock);
68 dev_info(udc->dev, "Device disconnected\n");
71 static void udc_drd_work(struct work_struct *work)
75 udc = container_of(to_delayed_work(work),
76 struct udc, drd_work);
79 dev_dbg(udc->dev, "idle -> device\n");
82 dev_dbg(udc->dev, "device -> idle\n");
87 static int usbd_connect_notify(struct notifier_block *self,
88 unsigned long event, void *ptr)
90 struct udc *udc = container_of(self, struct udc, nb);
92 dev_dbg(udc->dev, "%s: event: %lu\n", __func__, event);
94 udc->conn_type = event;
96 schedule_delayed_work(&udc->drd_work, 0);
101 static int udc_plat_probe(struct platform_device *pdev)
103 struct device *dev = &pdev->dev;
104 struct resource *res;
108 udc = devm_kzalloc(dev, sizeof(*udc), GFP_KERNEL);
112 spin_lock_init(&udc->lock);
115 udc->virt_addr = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
116 if (IS_ERR(udc->virt_addr))
117 return PTR_ERR(udc->virt_addr);
119 /* udc csr registers base */
120 udc->csr = udc->virt_addr + UDC_CSR_ADDR;
122 /* dev registers base */
123 udc->regs = udc->virt_addr + UDC_DEVCFG_ADDR;
125 /* ep registers base */
126 udc->ep_regs = udc->virt_addr + UDC_EPREGS_ADDR;
129 udc->rxfifo = (u32 __iomem *)(udc->virt_addr + UDC_RXFIFO_ADDR);
130 udc->txfifo = (u32 __iomem *)(udc->virt_addr + UDC_TXFIFO_ADDR);
132 udc->phys_addr = (unsigned long)res->start;
134 udc->irq = irq_of_parse_and_map(dev->of_node, 0);
136 dev_err(dev, "Can't parse and map interrupt\n");
140 udc->udc_phy = devm_of_phy_get_by_index(dev, dev->of_node, 0);
141 if (IS_ERR(udc->udc_phy)) {
142 dev_err(dev, "Failed to obtain phy from device tree\n");
143 return PTR_ERR(udc->udc_phy);
146 ret = phy_init(udc->udc_phy);
148 dev_err(dev, "UDC phy init failed");
152 ret = phy_power_on(udc->udc_phy);
154 dev_err(dev, "UDC phy power on failed");
155 phy_exit(udc->udc_phy);
159 /* Register for extcon if supported */
160 if (of_property_present(dev->of_node, "extcon")) {
161 udc->edev = extcon_get_edev_by_phandle(dev, 0);
162 if (IS_ERR(udc->edev)) {
163 if (PTR_ERR(udc->edev) == -EPROBE_DEFER)
164 return -EPROBE_DEFER;
165 dev_err(dev, "Invalid or missing extcon\n");
166 ret = PTR_ERR(udc->edev);
170 udc->nb.notifier_call = usbd_connect_notify;
171 ret = extcon_register_notifier(udc->edev, EXTCON_USB,
174 dev_err(dev, "Can't register extcon device\n");
178 ret = extcon_get_state(udc->edev, EXTCON_USB);
180 dev_err(dev, "Can't get cable state\n");
183 udc->conn_type = ret;
185 INIT_DELAYED_WORK(&udc->drd_work, udc_drd_work);
190 ret = init_dma_pools(udc);
195 ret = devm_request_irq(dev, udc->irq, udc_irq, IRQF_SHARED,
198 dev_err(dev, "Request irq %d failed for UDC\n", udc->irq);
202 platform_set_drvdata(pdev, udc);
203 udc->chiprev = UDC_BCM_REV;
205 if (udc_probe(udc)) {
209 dev_info(dev, "Synopsys UDC platform driver probe successful\n");
218 extcon_unregister_notifier(udc->edev, EXTCON_USB, &udc->nb);
221 phy_power_off(udc->udc_phy);
222 phy_exit(udc->udc_phy);
227 static void udc_plat_remove(struct platform_device *pdev)
231 dev = platform_get_drvdata(pdev);
233 usb_del_gadget_udc(&dev->gadget);
234 /* gadget driver must not be registered */
235 if (WARN_ON(dev->driver))
238 /* dma pool cleanup */
243 platform_set_drvdata(pdev, NULL);
245 phy_power_off(dev->udc_phy);
246 phy_exit(dev->udc_phy);
247 extcon_unregister_notifier(dev->edev, EXTCON_USB, &dev->nb);
249 dev_info(&pdev->dev, "Synopsys UDC platform driver removed\n");
252 #ifdef CONFIG_PM_SLEEP
253 static int udc_plat_suspend(struct device *dev)
257 udc = dev_get_drvdata(dev);
260 if (extcon_get_state(udc->edev, EXTCON_USB) > 0) {
261 dev_dbg(udc->dev, "device -> idle\n");
264 phy_power_off(udc->udc_phy);
265 phy_exit(udc->udc_phy);
270 static int udc_plat_resume(struct device *dev)
275 udc = dev_get_drvdata(dev);
277 ret = phy_init(udc->udc_phy);
279 dev_err(udc->dev, "UDC phy init failure");
283 ret = phy_power_on(udc->udc_phy);
285 dev_err(udc->dev, "UDC phy power on failure");
286 phy_exit(udc->udc_phy);
290 if (extcon_get_state(udc->edev, EXTCON_USB) > 0) {
291 dev_dbg(udc->dev, "idle -> device\n");
297 static const struct dev_pm_ops udc_plat_pm_ops = {
298 .suspend = udc_plat_suspend,
299 .resume = udc_plat_resume,
303 static const struct of_device_id of_udc_match[] = {
304 { .compatible = "brcm,ns2-udc", },
305 { .compatible = "brcm,cygnus-udc", },
306 { .compatible = "brcm,iproc-udc", },
309 MODULE_DEVICE_TABLE(of, of_udc_match);
311 static struct platform_driver udc_plat_driver = {
312 .probe = udc_plat_probe,
313 .remove_new = udc_plat_remove,
315 .name = "snps-udc-plat",
316 .of_match_table = of_udc_match,
317 #ifdef CONFIG_PM_SLEEP
318 .pm = &udc_plat_pm_ops,
322 module_platform_driver(udc_plat_driver);
324 MODULE_DESCRIPTION(UDC_MOD_DESCRIPTION);
325 MODULE_AUTHOR("Broadcom");
326 MODULE_LICENSE("GPL v2");