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