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/platform_device.h>
12#include <linux/phy/phy.h>
13#include <linux/module.h>
14#include <linux/dmapool.h>
15#include <linux/interrupt.h>
16#include <linux/moduleparam.h>
17#include "amd5536udc.h"
18
19/* description */
20#define UDC_MOD_DESCRIPTION     "Synopsys UDC platform driver"
21
22static void start_udc(struct udc *udc)
23{
24	if (udc->driver) {
25		dev_info(udc->dev, "Connecting...\n");
26		udc_enable_dev_setup_interrupts(udc);
27		udc_basic_init(udc);
28		udc->connected = 1;
29	}
30}
31
32static void stop_udc(struct udc *udc)
33{
34	int tmp;
35	u32 reg;
36
37	spin_lock(&udc->lock);
38
39	/* Flush the receieve fifo */
40	reg = readl(&udc->regs->ctl);
41	reg |= AMD_BIT(UDC_DEVCTL_SRX_FLUSH);
42	writel(reg, &udc->regs->ctl);
43
44	reg = readl(&udc->regs->ctl);
45	reg &= ~(AMD_BIT(UDC_DEVCTL_SRX_FLUSH));
46	writel(reg, &udc->regs->ctl);
47	dev_dbg(udc->dev, "ep rx queue flushed\n");
48
49	/* Mask interrupts. Required more so when the
50	 * UDC is connected to a DRD phy.
51	 */
52	udc_mask_unused_interrupts(udc);
53
54	/* Disconnect gadget driver */
55	if (udc->driver) {
56		spin_unlock(&udc->lock);
57		udc->driver->disconnect(&udc->gadget);
58		spin_lock(&udc->lock);
59
60		/* empty queues */
61		for (tmp = 0; tmp < UDC_EP_NUM; tmp++)
62			empty_req_queue(&udc->ep[tmp]);
63	}
64	udc->connected = 0;
65
66	spin_unlock(&udc->lock);
67	dev_info(udc->dev, "Device disconnected\n");
68}
69
70static void udc_drd_work(struct work_struct *work)
71{
72	struct udc *udc;
73
74	udc = container_of(to_delayed_work(work),
75			   struct udc, drd_work);
76
77	if (udc->conn_type) {
78		dev_dbg(udc->dev, "idle -> device\n");
79		start_udc(udc);
80	} else {
81		dev_dbg(udc->dev, "device -> idle\n");
82		stop_udc(udc);
83	}
84}
85
86static int usbd_connect_notify(struct notifier_block *self,
87			       unsigned long event, void *ptr)
88{
89	struct udc *udc = container_of(self, struct udc, nb);
90
91	dev_dbg(udc->dev, "%s: event: %lu\n", __func__, event);
92
93	udc->conn_type = event;
94
95	schedule_delayed_work(&udc->drd_work, 0);
96
97	return NOTIFY_OK;
98}
99
100static int udc_plat_probe(struct platform_device *pdev)
101{
102	struct device *dev = &pdev->dev;
103	struct resource *res;
104	struct udc *udc;
105	int ret;
106
107	udc = devm_kzalloc(dev, sizeof(*udc), GFP_KERNEL);
108	if (!udc)
109		return -ENOMEM;
110
111	spin_lock_init(&udc->lock);
112	udc->dev = dev;
113
114	udc->virt_addr = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
115	if (IS_ERR(udc->virt_addr))
116		return PTR_ERR(udc->virt_addr);
117
118	/* udc csr registers base */
119	udc->csr = udc->virt_addr + UDC_CSR_ADDR;
120
121	/* dev registers base */
122	udc->regs = udc->virt_addr + UDC_DEVCFG_ADDR;
123
124	/* ep registers base */
125	udc->ep_regs = udc->virt_addr + UDC_EPREGS_ADDR;
126
127	/* fifo's base */
128	udc->rxfifo = (u32 __iomem *)(udc->virt_addr + UDC_RXFIFO_ADDR);
129	udc->txfifo = (u32 __iomem *)(udc->virt_addr + UDC_TXFIFO_ADDR);
130
131	udc->phys_addr = (unsigned long)res->start;
132
133	udc->irq = irq_of_parse_and_map(dev->of_node, 0);
134	if (udc->irq <= 0) {
135		dev_err(dev, "Can't parse and map interrupt\n");
136		return -EINVAL;
137	}
138
139	udc->udc_phy = devm_of_phy_get_by_index(dev, dev->of_node, 0);
140	if (IS_ERR(udc->udc_phy)) {
141		dev_err(dev, "Failed to obtain phy from device tree\n");
142		return PTR_ERR(udc->udc_phy);
143	}
144
145	ret = phy_init(udc->udc_phy);
146	if (ret) {
147		dev_err(dev, "UDC phy init failed");
148		return ret;
149	}
150
151	ret = phy_power_on(udc->udc_phy);
152	if (ret) {
153		dev_err(dev, "UDC phy power on failed");
154		phy_exit(udc->udc_phy);
155		return ret;
156	}
157
158	/* Register for extcon if supported */
159	if (of_property_present(dev->of_node, "extcon")) {
160		udc->edev = extcon_get_edev_by_phandle(dev, 0);
161		if (IS_ERR(udc->edev)) {
162			if (PTR_ERR(udc->edev) == -EPROBE_DEFER)
163				return -EPROBE_DEFER;
164			dev_err(dev, "Invalid or missing extcon\n");
165			ret = PTR_ERR(udc->edev);
166			goto exit_phy;
167		}
168
169		udc->nb.notifier_call = usbd_connect_notify;
170		ret = extcon_register_notifier(udc->edev, EXTCON_USB,
171					       &udc->nb);
172		if (ret < 0) {
173			dev_err(dev, "Can't register extcon device\n");
174			goto exit_phy;
175		}
176
177		ret = extcon_get_state(udc->edev, EXTCON_USB);
178		if (ret < 0) {
179			dev_err(dev, "Can't get cable state\n");
180			goto exit_extcon;
181		} else if (ret) {
182			udc->conn_type = ret;
183		}
184		INIT_DELAYED_WORK(&udc->drd_work, udc_drd_work);
185	}
186
187	/* init dma pools */
188	if (use_dma) {
189		ret = init_dma_pools(udc);
190		if (ret != 0)
191			goto exit_extcon;
192	}
193
194	ret = devm_request_irq(dev, udc->irq, udc_irq, IRQF_SHARED,
195			       "snps-udc", udc);
196	if (ret < 0) {
197		dev_err(dev, "Request irq %d failed for UDC\n", udc->irq);
198		goto exit_dma;
199	}
200
201	platform_set_drvdata(pdev, udc);
202	udc->chiprev = UDC_BCM_REV;
203
204	if (udc_probe(udc)) {
205		ret = -ENODEV;
206		goto exit_dma;
207	}
208	dev_info(dev, "Synopsys UDC platform driver probe successful\n");
209
210	return 0;
211
212exit_dma:
213	if (use_dma)
214		free_dma_pools(udc);
215exit_extcon:
216	if (udc->edev)
217		extcon_unregister_notifier(udc->edev, EXTCON_USB, &udc->nb);
218exit_phy:
219	if (udc->udc_phy) {
220		phy_power_off(udc->udc_phy);
221		phy_exit(udc->udc_phy);
222	}
223	return ret;
224}
225
226static void udc_plat_remove(struct platform_device *pdev)
227{
228	struct udc *dev;
229
230	dev = platform_get_drvdata(pdev);
231
232	usb_del_gadget_udc(&dev->gadget);
233	/* gadget driver must not be registered */
234	if (WARN_ON(dev->driver))
235		return;
236
237	/* dma pool cleanup */
238	free_dma_pools(dev);
239
240	udc_remove(dev);
241
242	platform_set_drvdata(pdev, NULL);
243
244	phy_power_off(dev->udc_phy);
245	phy_exit(dev->udc_phy);
246	extcon_unregister_notifier(dev->edev, EXTCON_USB, &dev->nb);
247
248	dev_info(&pdev->dev, "Synopsys UDC platform driver removed\n");
249}
250
251#ifdef CONFIG_PM_SLEEP
252static int udc_plat_suspend(struct device *dev)
253{
254	struct udc *udc;
255
256	udc = dev_get_drvdata(dev);
257	stop_udc(udc);
258
259	if (extcon_get_state(udc->edev, EXTCON_USB) > 0) {
260		dev_dbg(udc->dev, "device -> idle\n");
261		stop_udc(udc);
262	}
263	phy_power_off(udc->udc_phy);
264	phy_exit(udc->udc_phy);
265
266	return 0;
267}
268
269static int udc_plat_resume(struct device *dev)
270{
271	struct udc *udc;
272	int ret;
273
274	udc = dev_get_drvdata(dev);
275
276	ret = phy_init(udc->udc_phy);
277	if (ret) {
278		dev_err(udc->dev, "UDC phy init failure");
279		return ret;
280	}
281
282	ret = phy_power_on(udc->udc_phy);
283	if (ret) {
284		dev_err(udc->dev, "UDC phy power on failure");
285		phy_exit(udc->udc_phy);
286		return ret;
287	}
288
289	if (extcon_get_state(udc->edev, EXTCON_USB) > 0) {
290		dev_dbg(udc->dev, "idle -> device\n");
291		start_udc(udc);
292	}
293
294	return 0;
295}
296static const struct dev_pm_ops udc_plat_pm_ops = {
297	.suspend	= udc_plat_suspend,
298	.resume		= udc_plat_resume,
299};
300#endif
301
302static const struct of_device_id of_udc_match[] = {
303	{ .compatible = "brcm,ns2-udc", },
304	{ .compatible = "brcm,cygnus-udc", },
305	{ .compatible = "brcm,iproc-udc", },
306	{ }
307};
308MODULE_DEVICE_TABLE(of, of_udc_match);
309
310static struct platform_driver udc_plat_driver = {
311	.probe		= udc_plat_probe,
312	.remove_new	= udc_plat_remove,
313	.driver		= {
314		.name	= "snps-udc-plat",
315		.of_match_table = of_udc_match,
316#ifdef CONFIG_PM_SLEEP
317		.pm	= &udc_plat_pm_ops,
318#endif
319	},
320};
321module_platform_driver(udc_plat_driver);
322
323MODULE_DESCRIPTION(UDC_MOD_DESCRIPTION);
324MODULE_AUTHOR("Broadcom");
325MODULE_LICENSE("GPL v2");
326