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27#include <linux/module.h>
28#include <linux/platform_device.h>
29#include <linux/dma-mapping.h>
30#include <linux/usb/gadget.h>
31#include <linux/usb/otg.h>
32#include <linux/usb/usb_phy_generic.h>
33#include <linux/slab.h>
34#include <linux/clk.h>
35#include <linux/regulator/consumer.h>
36#include <linux/of.h>
37#include <linux/of_gpio.h>
38#include <linux/gpio.h>
39#include <linux/delay.h>
40
41#include "phy-generic.h"
42
43#define VBUS_IRQ_FLAGS \
44 (IRQF_SHARED | IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | \
45 IRQF_ONESHOT)
46
47struct platform_device *usb_phy_generic_register(void)
48{
49 return platform_device_register_simple("usb_phy_generic",
50 PLATFORM_DEVID_AUTO, NULL, 0);
51}
52EXPORT_SYMBOL_GPL(usb_phy_generic_register);
53
54void usb_phy_generic_unregister(struct platform_device *pdev)
55{
56 platform_device_unregister(pdev);
57}
58EXPORT_SYMBOL_GPL(usb_phy_generic_unregister);
59
60static int nop_set_suspend(struct usb_phy *x, int suspend)
61{
62 struct usb_phy_generic *nop = dev_get_drvdata(x->dev);
63
64 if (!IS_ERR(nop->clk)) {
65 if (suspend)
66 clk_disable_unprepare(nop->clk);
67 else
68 clk_prepare_enable(nop->clk);
69 }
70
71 return 0;
72}
73
74static void nop_reset(struct usb_phy_generic *nop)
75{
76 if (!nop->gpiod_reset)
77 return;
78
79 gpiod_set_value(nop->gpiod_reset, 1);
80 usleep_range(10000, 20000);
81 gpiod_set_value(nop->gpiod_reset, 0);
82}
83
84
85static void nop_set_vbus_draw(struct usb_phy_generic *nop, unsigned mA)
86{
87 struct regulator *vbus_draw = nop->vbus_draw;
88 int enabled;
89 int ret;
90
91 if (!vbus_draw)
92 return;
93
94 enabled = nop->vbus_draw_enabled;
95 if (mA) {
96 regulator_set_current_limit(vbus_draw, 0, 1000 * mA);
97 if (!enabled) {
98 ret = regulator_enable(vbus_draw);
99 if (ret < 0)
100 return;
101 nop->vbus_draw_enabled = 1;
102 }
103 } else {
104 if (enabled) {
105 ret = regulator_disable(vbus_draw);
106 if (ret < 0)
107 return;
108 nop->vbus_draw_enabled = 0;
109 }
110 }
111 nop->mA = mA;
112}
113
114
115static irqreturn_t nop_gpio_vbus_thread(int irq, void *data)
116{
117 struct usb_phy_generic *nop = data;
118 struct usb_otg *otg = nop->phy.otg;
119 int vbus, status;
120
121 vbus = gpiod_get_value(nop->gpiod_vbus);
122 if ((vbus ^ nop->vbus) == 0)
123 return IRQ_HANDLED;
124 nop->vbus = vbus;
125
126 if (vbus) {
127 status = USB_EVENT_VBUS;
128 otg->state = OTG_STATE_B_PERIPHERAL;
129 nop->phy.last_event = status;
130
131
132 nop_set_vbus_draw(nop, 100);
133
134 atomic_notifier_call_chain(&nop->phy.notifier, status,
135 otg->gadget);
136 } else {
137 nop_set_vbus_draw(nop, 0);
138
139 status = USB_EVENT_NONE;
140 otg->state = OTG_STATE_B_IDLE;
141 nop->phy.last_event = status;
142
143 atomic_notifier_call_chain(&nop->phy.notifier, status,
144 otg->gadget);
145 }
146 return IRQ_HANDLED;
147}
148
149int usb_gen_phy_init(struct usb_phy *phy)
150{
151 struct usb_phy_generic *nop = dev_get_drvdata(phy->dev);
152 int ret;
153
154 if (!IS_ERR(nop->vcc)) {
155 if (regulator_enable(nop->vcc))
156 dev_err(phy->dev, "Failed to enable power\n");
157 }
158
159 if (!IS_ERR(nop->clk)) {
160 ret = clk_prepare_enable(nop->clk);
161 if (ret)
162 return ret;
163 }
164
165 nop_reset(nop);
166
167 return 0;
168}
169EXPORT_SYMBOL_GPL(usb_gen_phy_init);
170
171void usb_gen_phy_shutdown(struct usb_phy *phy)
172{
173 struct usb_phy_generic *nop = dev_get_drvdata(phy->dev);
174
175 gpiod_set_value(nop->gpiod_reset, 1);
176
177 if (!IS_ERR(nop->clk))
178 clk_disable_unprepare(nop->clk);
179
180 if (!IS_ERR(nop->vcc)) {
181 if (regulator_disable(nop->vcc))
182 dev_err(phy->dev, "Failed to disable power\n");
183 }
184}
185EXPORT_SYMBOL_GPL(usb_gen_phy_shutdown);
186
187static int nop_set_peripheral(struct usb_otg *otg, struct usb_gadget *gadget)
188{
189 if (!otg)
190 return -ENODEV;
191
192 if (!gadget) {
193 otg->gadget = NULL;
194 return -ENODEV;
195 }
196
197 otg->gadget = gadget;
198 if (otg->state == OTG_STATE_B_PERIPHERAL)
199 atomic_notifier_call_chain(&otg->usb_phy->notifier,
200 USB_EVENT_VBUS, otg->gadget);
201 else
202 otg->state = OTG_STATE_B_IDLE;
203 return 0;
204}
205
206static int nop_set_host(struct usb_otg *otg, struct usb_bus *host)
207{
208 if (!otg)
209 return -ENODEV;
210
211 if (!host) {
212 otg->host = NULL;
213 return -ENODEV;
214 }
215
216 otg->host = host;
217 return 0;
218}
219
220int usb_phy_gen_create_phy(struct device *dev, struct usb_phy_generic *nop,
221 struct usb_phy_generic_platform_data *pdata)
222{
223 enum usb_phy_type type = USB_PHY_TYPE_USB2;
224 int err = 0;
225
226 u32 clk_rate = 0;
227 bool needs_vcc = false;
228
229 if (dev->of_node) {
230 struct device_node *node = dev->of_node;
231
232 if (of_property_read_u32(node, "clock-frequency", &clk_rate))
233 clk_rate = 0;
234
235 needs_vcc = of_property_read_bool(node, "vcc-supply");
236 nop->gpiod_reset = devm_gpiod_get_optional(dev, "reset",
237 GPIOD_ASIS);
238 err = PTR_ERR_OR_ZERO(nop->gpiod_reset);
239 if (!err) {
240 nop->gpiod_vbus = devm_gpiod_get_optional(dev,
241 "vbus-detect",
242 GPIOD_ASIS);
243 err = PTR_ERR_OR_ZERO(nop->gpiod_vbus);
244 }
245 } else if (pdata) {
246 type = pdata->type;
247 clk_rate = pdata->clk_rate;
248 needs_vcc = pdata->needs_vcc;
249 if (gpio_is_valid(pdata->gpio_reset)) {
250 err = devm_gpio_request_one(dev, pdata->gpio_reset,
251 GPIOF_ACTIVE_LOW,
252 dev_name(dev));
253 if (!err)
254 nop->gpiod_reset =
255 gpio_to_desc(pdata->gpio_reset);
256 }
257 nop->gpiod_vbus = pdata->gpiod_vbus;
258 }
259
260 if (err == -EPROBE_DEFER)
261 return -EPROBE_DEFER;
262 if (err) {
263 dev_err(dev, "Error requesting RESET or VBUS GPIO\n");
264 return err;
265 }
266 if (nop->gpiod_reset)
267 gpiod_direction_output(nop->gpiod_reset, 1);
268
269 nop->phy.otg = devm_kzalloc(dev, sizeof(*nop->phy.otg),
270 GFP_KERNEL);
271 if (!nop->phy.otg)
272 return -ENOMEM;
273
274 nop->clk = devm_clk_get(dev, "main_clk");
275 if (IS_ERR(nop->clk)) {
276 dev_dbg(dev, "Can't get phy clock: %ld\n",
277 PTR_ERR(nop->clk));
278 }
279
280 if (!IS_ERR(nop->clk) && clk_rate) {
281 err = clk_set_rate(nop->clk, clk_rate);
282 if (err) {
283 dev_err(dev, "Error setting clock rate\n");
284 return err;
285 }
286 }
287
288 nop->vcc = devm_regulator_get(dev, "vcc");
289 if (IS_ERR(nop->vcc)) {
290 dev_dbg(dev, "Error getting vcc regulator: %ld\n",
291 PTR_ERR(nop->vcc));
292 if (needs_vcc)
293 return -EPROBE_DEFER;
294 }
295
296 nop->dev = dev;
297 nop->phy.dev = nop->dev;
298 nop->phy.label = "nop-xceiv";
299 nop->phy.set_suspend = nop_set_suspend;
300 nop->phy.type = type;
301
302 nop->phy.otg->state = OTG_STATE_UNDEFINED;
303 nop->phy.otg->usb_phy = &nop->phy;
304 nop->phy.otg->set_host = nop_set_host;
305 nop->phy.otg->set_peripheral = nop_set_peripheral;
306
307 return 0;
308}
309EXPORT_SYMBOL_GPL(usb_phy_gen_create_phy);
310
311static int usb_phy_generic_probe(struct platform_device *pdev)
312{
313 struct device *dev = &pdev->dev;
314 struct usb_phy_generic *nop;
315 int err;
316
317 nop = devm_kzalloc(dev, sizeof(*nop), GFP_KERNEL);
318 if (!nop)
319 return -ENOMEM;
320
321 err = usb_phy_gen_create_phy(dev, nop, dev_get_platdata(&pdev->dev));
322 if (err)
323 return err;
324 if (nop->gpiod_vbus) {
325 err = devm_request_threaded_irq(&pdev->dev,
326 gpiod_to_irq(nop->gpiod_vbus),
327 NULL, nop_gpio_vbus_thread,
328 VBUS_IRQ_FLAGS, "vbus_detect",
329 nop);
330 if (err) {
331 dev_err(&pdev->dev, "can't request irq %i, err: %d\n",
332 gpiod_to_irq(nop->gpiod_vbus), err);
333 return err;
334 }
335 nop->phy.otg->state = gpiod_get_value(nop->gpiod_vbus) ?
336 OTG_STATE_B_PERIPHERAL : OTG_STATE_B_IDLE;
337 }
338
339 nop->phy.init = usb_gen_phy_init;
340 nop->phy.shutdown = usb_gen_phy_shutdown;
341
342 err = usb_add_phy_dev(&nop->phy);
343 if (err) {
344 dev_err(&pdev->dev, "can't register transceiver, err: %d\n",
345 err);
346 return err;
347 }
348
349 platform_set_drvdata(pdev, nop);
350
351 return 0;
352}
353
354static int usb_phy_generic_remove(struct platform_device *pdev)
355{
356 struct usb_phy_generic *nop = platform_get_drvdata(pdev);
357
358 usb_remove_phy(&nop->phy);
359
360 return 0;
361}
362
363static const struct of_device_id nop_xceiv_dt_ids[] = {
364 { .compatible = "usb-nop-xceiv" },
365 { }
366};
367
368MODULE_DEVICE_TABLE(of, nop_xceiv_dt_ids);
369
370static struct platform_driver usb_phy_generic_driver = {
371 .probe = usb_phy_generic_probe,
372 .remove = usb_phy_generic_remove,
373 .driver = {
374 .name = "usb_phy_generic",
375 .of_match_table = nop_xceiv_dt_ids,
376 },
377};
378
379static int __init usb_phy_generic_init(void)
380{
381 return platform_driver_register(&usb_phy_generic_driver);
382}
383subsys_initcall(usb_phy_generic_init);
384
385static void __exit usb_phy_generic_exit(void)
386{
387 platform_driver_unregister(&usb_phy_generic_driver);
388}
389module_exit(usb_phy_generic_exit);
390
391MODULE_ALIAS("platform:usb_phy_generic");
392MODULE_AUTHOR("Texas Instruments Inc");
393MODULE_DESCRIPTION("NOP USB Transceiver driver");
394MODULE_LICENSE("GPL");
395
