1// SPDX-License-Identifier: GPL-2.0
2/*
3 * snps_udc_plat.c - Synopsys UDC Platform Driver
4 *
5 * Copyright (C) 2016 Broadcom
6 */
7
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"
19
20/* description */
21#define UDC_MOD_DESCRIPTION     "Synopsys UDC platform driver"
22
23static void start_udc(struct udc *udc)
24{
25	if (udc->driver) {
26		dev_info(udc->dev, "Connecting...\n");
27		udc_enable_dev_setup_interrupts(udc);
28		udc_basic_init(udc);
29		udc->connected = 1;
30	}
31}
32
33static void stop_udc(struct udc *udc)
34{
35	int tmp;
36	u32 reg;
37
38	spin_lock(&udc->lock);
39
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);
44
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");
49
50	/* Mask interrupts. Required more so when the
51	 * UDC is connected to a DRD phy.
52	 */
53	udc_mask_unused_interrupts(udc);
54
55	/* Disconnect gadget driver */
56	if (udc->driver) {
57		spin_unlock(&udc->lock);
58		udc->driver->disconnect(&udc->gadget);
59		spin_lock(&udc->lock);
60
61		/* empty queues */
62		for (tmp = 0; tmp < UDC_EP_NUM; tmp++)
63			empty_req_queue(&udc->ep[tmp]);
64	}
65	udc->connected = 0;
66
67	spin_unlock(&udc->lock);
68	dev_info(udc->dev, "Device disconnected\n");
69}
70
71static void udc_drd_work(struct work_struct *work)
72{
73	struct udc *udc;
74
75	udc = container_of(to_delayed_work(work),
76			   struct udc, drd_work);
77
78	if (udc->conn_type) {
79		dev_dbg(udc->dev, "idle -> device\n");
80		start_udc(udc);
81	} else {
82		dev_dbg(udc->dev, "device -> idle\n");
83		stop_udc(udc);
84	}
85}
86
87static int usbd_connect_notify(struct notifier_block *self,
88			       unsigned long event, void *ptr)
89{
90	struct udc *udc = container_of(self, struct udc, nb);
91
92	dev_dbg(udc->dev, "%s: event: %lu\n", __func__, event);
93
94	udc->conn_type = event;
95
96	schedule_delayed_work(&udc->drd_work, 0);
97
98	return NOTIFY_OK;
99}
100
101static int udc_plat_probe(struct platform_device *pdev)
102{
103	struct device *dev = &pdev->dev;
104	struct resource *res;
105	struct udc *udc;
106	int ret;
107
108	udc = devm_kzalloc(dev, sizeof(*udc), GFP_KERNEL);
109	if (!udc)
110		return -ENOMEM;
111
112	spin_lock_init(&udc->lock);
113	udc->dev = dev;
114
115	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
116	udc->virt_addr = devm_ioremap_resource(dev, res);
117	if (IS_ERR(udc->virt_addr))
118		return PTR_ERR(udc->virt_addr);
119
120	/* udc csr registers base */
121	udc->csr = udc->virt_addr + UDC_CSR_ADDR;
122
123	/* dev registers base */
124	udc->regs = udc->virt_addr + UDC_DEVCFG_ADDR;
125
126	/* ep registers base */
127	udc->ep_regs = udc->virt_addr + UDC_EPREGS_ADDR;
128
129	/* fifo's base */
130	udc->rxfifo = (u32 __iomem *)(udc->virt_addr + UDC_RXFIFO_ADDR);
131	udc->txfifo = (u32 __iomem *)(udc->virt_addr + UDC_TXFIFO_ADDR);
132
133	udc->phys_addr = (unsigned long)res->start;
134
135	udc->irq = irq_of_parse_and_map(dev->of_node, 0);
136	if (udc->irq <= 0) {
137		dev_err(dev, "Can't parse and map interrupt\n");
138		return -EINVAL;
139	}
140
141	udc->udc_phy = devm_of_phy_get_by_index(dev, dev->of_node, 0);
142	if (IS_ERR(udc->udc_phy)) {
143		dev_err(dev, "Failed to obtain phy from device tree\n");
144		return PTR_ERR(udc->udc_phy);
145	}
146
147	ret = phy_init(udc->udc_phy);
148	if (ret) {
149		dev_err(dev, "UDC phy init failed");
150		return ret;
151	}
152
153	ret = phy_power_on(udc->udc_phy);
154	if (ret) {
155		dev_err(dev, "UDC phy power on failed");
156		phy_exit(udc->udc_phy);
157		return ret;
158	}
159
160	/* Register for extcon if supported */
161	if (of_get_property(dev->of_node, "extcon", NULL)) {
162		udc->edev = extcon_get_edev_by_phandle(dev, 0);
163		if (IS_ERR(udc->edev)) {
164			if (PTR_ERR(udc->edev) == -EPROBE_DEFER)
165				return -EPROBE_DEFER;
166			dev_err(dev, "Invalid or missing extcon\n");
167			ret = PTR_ERR(udc->edev);
168			goto exit_phy;
169		}
170
171		udc->nb.notifier_call = usbd_connect_notify;
172		ret = extcon_register_notifier(udc->edev, EXTCON_USB,
173					       &udc->nb);
174		if (ret < 0) {
175			dev_err(dev, "Can't register extcon device\n");
176			goto exit_phy;
177		}
178
179		ret = extcon_get_state(udc->edev, EXTCON_USB);
180		if (ret < 0) {
181			dev_err(dev, "Can't get cable state\n");
182			goto exit_extcon;
183		} else if (ret) {
184			udc->conn_type = ret;
185		}
186		INIT_DELAYED_WORK(&udc->drd_work, udc_drd_work);
187	}
188
189	/* init dma pools */
190	if (use_dma) {
191		ret = init_dma_pools(udc);
192		if (ret != 0)
193			goto exit_extcon;
194	}
195
196	ret = devm_request_irq(dev, udc->irq, udc_irq, IRQF_SHARED,
197			       "snps-udc", udc);
198	if (ret < 0) {
199		dev_err(dev, "Request irq %d failed for UDC\n", udc->irq);
200		goto exit_dma;
201	}
202
203	platform_set_drvdata(pdev, udc);
204	udc->chiprev = UDC_BCM_REV;
205
206	if (udc_probe(udc)) {
207		ret = -ENODEV;
208		goto exit_dma;
209	}
210	dev_info(dev, "Synopsys UDC platform driver probe successful\n");
211
212	return 0;
213
214exit_dma:
215	if (use_dma)
216		free_dma_pools(udc);
217exit_extcon:
218	if (udc->edev)
219		extcon_unregister_notifier(udc->edev, EXTCON_USB, &udc->nb);
220exit_phy:
221	if (udc->udc_phy) {
222		phy_power_off(udc->udc_phy);
223		phy_exit(udc->udc_phy);
224	}
225	return ret;
226}
227
228static int udc_plat_remove(struct platform_device *pdev)
229{
230	struct udc *dev;
231
232	dev = platform_get_drvdata(pdev);
233
234	usb_del_gadget_udc(&dev->gadget);
235	/* gadget driver must not be registered */
236	if (WARN_ON(dev->driver))
237		return 0;
238
239	/* dma pool cleanup */
240	free_dma_pools(dev);
241
242	udc_remove(dev);
243
244	platform_set_drvdata(pdev, NULL);
245
246	if (dev->drd_wq) {
247		flush_workqueue(dev->drd_wq);
248		destroy_workqueue(dev->drd_wq);
249	}
250
251	phy_power_off(dev->udc_phy);
252	phy_exit(dev->udc_phy);
253	extcon_unregister_notifier(dev->edev, EXTCON_USB, &dev->nb);
254
255	dev_info(&pdev->dev, "Synopsys UDC platform driver removed\n");
256
257	return 0;
258}
259
260#ifdef CONFIG_PM_SLEEP
261static int udc_plat_suspend(struct device *dev)
262{
263	struct udc *udc;
264
265	udc = dev_get_drvdata(dev);
266	stop_udc(udc);
267
268	if (extcon_get_state(udc->edev, EXTCON_USB) > 0) {
269		dev_dbg(udc->dev, "device -> idle\n");
270		stop_udc(udc);
271	}
272	phy_power_off(udc->udc_phy);
273	phy_exit(udc->udc_phy);
274
275	return 0;
276}
277
278static int udc_plat_resume(struct device *dev)
279{
280	struct udc *udc;
281	int ret;
282
283	udc = dev_get_drvdata(dev);
284
285	ret = phy_init(udc->udc_phy);
286	if (ret) {
287		dev_err(udc->dev, "UDC phy init failure");
288		return ret;
289	}
290
291	ret = phy_power_on(udc->udc_phy);
292	if (ret) {
293		dev_err(udc->dev, "UDC phy power on failure");
294		phy_exit(udc->udc_phy);
295		return ret;
296	}
297
298	if (extcon_get_state(udc->edev, EXTCON_USB) > 0) {
299		dev_dbg(udc->dev, "idle -> device\n");
300		start_udc(udc);
301	}
302
303	return 0;
304}
305static const struct dev_pm_ops udc_plat_pm_ops = {
306	.suspend	= udc_plat_suspend,
307	.resume		= udc_plat_resume,
308};
309#endif
310
311#if defined(CONFIG_OF)
312static const struct of_device_id of_udc_match[] = {
313	{ .compatible = "brcm,ns2-udc", },
314	{ .compatible = "brcm,cygnus-udc", },
315	{ .compatible = "brcm,iproc-udc", },
316	{ }
317};
318MODULE_DEVICE_TABLE(of, of_udc_match);
319#endif
320
321static struct platform_driver udc_plat_driver = {
322	.probe		= udc_plat_probe,
323	.remove		= udc_plat_remove,
324	.driver		= {
325		.name	= "snps-udc-plat",
326		.of_match_table = of_match_ptr(of_udc_match),
327#ifdef CONFIG_PM_SLEEP
328		.pm	= &udc_plat_pm_ops,
329#endif
330	},
331};
332module_platform_driver(udc_plat_driver);
333
334MODULE_DESCRIPTION(UDC_MOD_DESCRIPTION);
335MODULE_AUTHOR("Broadcom");
336MODULE_LICENSE("GPL v2");
337