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
start_udc(struct udc * udc)23 static 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
stop_udc(struct udc * udc)33 static 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
udc_drd_work(struct work_struct * work)71 static 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
usbd_connect_notify(struct notifier_block * self,unsigned long event,void * ptr)87 static 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
udc_plat_probe(struct platform_device * pdev)101 static 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
214 exit_dma:
215 if (use_dma)
216 free_dma_pools(udc);
217 exit_extcon:
218 if (udc->edev)
219 extcon_unregister_notifier(udc->edev, EXTCON_USB, &udc->nb);
220 exit_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
udc_plat_remove(struct platform_device * pdev)228 static 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 phy_power_off(dev->udc_phy);
247 phy_exit(dev->udc_phy);
248 extcon_unregister_notifier(dev->edev, EXTCON_USB, &dev->nb);
249
250 dev_info(&pdev->dev, "Synopsys UDC platform driver removed\n");
251
252 return 0;
253 }
254
255 #ifdef CONFIG_PM_SLEEP
udc_plat_suspend(struct device * dev)256 static int udc_plat_suspend(struct device *dev)
257 {
258 struct udc *udc;
259
260 udc = dev_get_drvdata(dev);
261 stop_udc(udc);
262
263 if (extcon_get_state(udc->edev, EXTCON_USB) > 0) {
264 dev_dbg(udc->dev, "device -> idle\n");
265 stop_udc(udc);
266 }
267 phy_power_off(udc->udc_phy);
268 phy_exit(udc->udc_phy);
269
270 return 0;
271 }
272
udc_plat_resume(struct device * dev)273 static int udc_plat_resume(struct device *dev)
274 {
275 struct udc *udc;
276 int ret;
277
278 udc = dev_get_drvdata(dev);
279
280 ret = phy_init(udc->udc_phy);
281 if (ret) {
282 dev_err(udc->dev, "UDC phy init failure");
283 return ret;
284 }
285
286 ret = phy_power_on(udc->udc_phy);
287 if (ret) {
288 dev_err(udc->dev, "UDC phy power on failure");
289 phy_exit(udc->udc_phy);
290 return ret;
291 }
292
293 if (extcon_get_state(udc->edev, EXTCON_USB) > 0) {
294 dev_dbg(udc->dev, "idle -> device\n");
295 start_udc(udc);
296 }
297
298 return 0;
299 }
300 static const struct dev_pm_ops udc_plat_pm_ops = {
301 .suspend = udc_plat_suspend,
302 .resume = udc_plat_resume,
303 };
304 #endif
305
306 #if defined(CONFIG_OF)
307 static const struct of_device_id of_udc_match[] = {
308 { .compatible = "brcm,ns2-udc", },
309 { .compatible = "brcm,cygnus-udc", },
310 { .compatible = "brcm,iproc-udc", },
311 { }
312 };
313 MODULE_DEVICE_TABLE(of, of_udc_match);
314 #endif
315
316 static struct platform_driver udc_plat_driver = {
317 .probe = udc_plat_probe,
318 .remove = udc_plat_remove,
319 .driver = {
320 .name = "snps-udc-plat",
321 .of_match_table = of_match_ptr(of_udc_match),
322 #ifdef CONFIG_PM_SLEEP
323 .pm = &udc_plat_pm_ops,
324 #endif
325 },
326 };
327 module_platform_driver(udc_plat_driver);
328
329 MODULE_DESCRIPTION(UDC_MOD_DESCRIPTION);
330 MODULE_AUTHOR("Broadcom");
331 MODULE_LICENSE("GPL v2");
332