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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
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
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
51
52
53 udc_mask_unused_interrupts(udc);
54
55
56 if (udc->driver) {
57 spin_unlock(&udc->lock);
58 udc->driver->disconnect(&udc->gadget);
59 spin_lock(&udc->lock);
60
61
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->regs))
118 return PTR_ERR(udc->regs);
119
120
121 udc->csr = udc->virt_addr + UDC_CSR_ADDR;
122
123
124 udc->regs = udc->virt_addr + UDC_DEVCFG_ADDR;
125
126
127 udc->ep_regs = udc->virt_addr + UDC_EPREGS_ADDR;
128
129
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
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
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
236 if (WARN_ON(dev->driver))
237 return 0;
238
239
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
