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f6d92a05 | 1 | /* |
f6d92a05 AKG |
2 | * NOP USB transceiver for all USB transceiver which are either built-in |
3 | * into USB IP or which are mostly autonomous. | |
4 | * | |
5 | * Copyright (C) 2009 Texas Instruments Inc | |
6 | * Author: Ajay Kumar Gupta <ajay.gupta@ti.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
21 | * | |
22 | * Current status: | |
cc835e32 DB |
23 | * This provides a "nop" transceiver for PHYs which are |
24 | * autonomous such as isp1504, isp1707, etc. | |
f6d92a05 AKG |
25 | */ |
26 | ||
27 | #include <linux/module.h> | |
28 | #include <linux/platform_device.h> | |
29 | #include <linux/dma-mapping.h> | |
7acc9973 | 30 | #include <linux/usb/gadget.h> |
f6d92a05 | 31 | #include <linux/usb/otg.h> |
d7078df6 | 32 | #include <linux/usb/usb_phy_generic.h> |
5a0e3ad6 | 33 | #include <linux/slab.h> |
2319fb88 | 34 | #include <linux/clk.h> |
58f735fe | 35 | #include <linux/regulator/consumer.h> |
0eba3879 | 36 | #include <linux/of.h> |
bd27fa44 RQ |
37 | #include <linux/of_gpio.h> |
38 | #include <linux/gpio.h> | |
39 | #include <linux/delay.h> | |
f6d92a05 | 40 | |
53b6fc28 | 41 | #include "phy-generic.h" |
f6d92a05 | 42 | |
7acc9973 RJ |
43 | #define VBUS_IRQ_FLAGS \ |
44 | (IRQF_SHARED | IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING) | |
45 | ||
2f36ff69 | 46 | struct platform_device *usb_phy_generic_register(void) |
f6d92a05 | 47 | { |
2f36ff69 FB |
48 | return platform_device_register_simple("usb_phy_generic", |
49 | PLATFORM_DEVID_AUTO, NULL, 0); | |
f6d92a05 | 50 | } |
4525beeb | 51 | EXPORT_SYMBOL_GPL(usb_phy_generic_register); |
f6d92a05 | 52 | |
2f36ff69 | 53 | void usb_phy_generic_unregister(struct platform_device *pdev) |
f6d92a05 | 54 | { |
2f36ff69 | 55 | platform_device_unregister(pdev); |
f6d92a05 | 56 | } |
4525beeb | 57 | EXPORT_SYMBOL_GPL(usb_phy_generic_unregister); |
f6d92a05 | 58 | |
86753811 | 59 | static int nop_set_suspend(struct usb_phy *x, int suspend) |
f6d92a05 AKG |
60 | { |
61 | return 0; | |
62 | } | |
63 | ||
4525beeb | 64 | static void nop_reset_set(struct usb_phy_generic *nop, int asserted) |
bd27fa44 | 65 | { |
e9f2cefb RJ |
66 | if (nop->gpiod_reset) |
67 | gpiod_set_value(nop->gpiod_reset, asserted); | |
bd27fa44 RQ |
68 | |
69 | if (!asserted) | |
70 | usleep_range(10000, 20000); | |
71 | } | |
72 | ||
7acc9973 RJ |
73 | /* interface to regulator framework */ |
74 | static void nop_set_vbus_draw(struct usb_phy_generic *nop, unsigned mA) | |
75 | { | |
76 | struct regulator *vbus_draw = nop->vbus_draw; | |
77 | int enabled; | |
78 | int ret; | |
79 | ||
80 | if (!vbus_draw) | |
81 | return; | |
82 | ||
83 | enabled = nop->vbus_draw_enabled; | |
84 | if (mA) { | |
85 | regulator_set_current_limit(vbus_draw, 0, 1000 * mA); | |
86 | if (!enabled) { | |
87 | ret = regulator_enable(vbus_draw); | |
88 | if (ret < 0) | |
89 | return; | |
90 | nop->vbus_draw_enabled = 1; | |
91 | } | |
92 | } else { | |
93 | if (enabled) { | |
94 | ret = regulator_disable(vbus_draw); | |
95 | if (ret < 0) | |
96 | return; | |
97 | nop->vbus_draw_enabled = 0; | |
98 | } | |
99 | } | |
100 | nop->mA = mA; | |
101 | } | |
102 | ||
103 | ||
104 | static irqreturn_t nop_gpio_vbus_thread(int irq, void *data) | |
105 | { | |
106 | struct usb_phy_generic *nop = data; | |
107 | struct usb_otg *otg = nop->phy.otg; | |
108 | int vbus, status; | |
109 | ||
110 | vbus = gpiod_get_value(nop->gpiod_vbus); | |
111 | if ((vbus ^ nop->vbus) == 0) | |
112 | return IRQ_HANDLED; | |
113 | nop->vbus = vbus; | |
114 | ||
115 | if (vbus) { | |
116 | status = USB_EVENT_VBUS; | |
117 | otg->state = OTG_STATE_B_PERIPHERAL; | |
118 | nop->phy.last_event = status; | |
119 | usb_gadget_vbus_connect(otg->gadget); | |
120 | ||
121 | /* drawing a "unit load" is *always* OK, except for OTG */ | |
122 | nop_set_vbus_draw(nop, 100); | |
123 | ||
124 | atomic_notifier_call_chain(&nop->phy.notifier, status, | |
125 | otg->gadget); | |
126 | } else { | |
127 | nop_set_vbus_draw(nop, 0); | |
128 | ||
129 | usb_gadget_vbus_disconnect(otg->gadget); | |
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 | ||
53b6fc28 | 140 | int usb_gen_phy_init(struct usb_phy *phy) |
2319fb88 | 141 | { |
4525beeb | 142 | struct usb_phy_generic *nop = dev_get_drvdata(phy->dev); |
2319fb88 | 143 | |
58f735fe RQ |
144 | if (!IS_ERR(nop->vcc)) { |
145 | if (regulator_enable(nop->vcc)) | |
146 | dev_err(phy->dev, "Failed to enable power\n"); | |
147 | } | |
148 | ||
2319fb88 | 149 | if (!IS_ERR(nop->clk)) |
4d175f34 | 150 | clk_prepare_enable(nop->clk); |
2319fb88 | 151 | |
bd27fa44 RQ |
152 | /* De-assert RESET */ |
153 | nop_reset_set(nop, 0); | |
ad63ebfc | 154 | |
2319fb88 RQ |
155 | return 0; |
156 | } | |
53b6fc28 | 157 | EXPORT_SYMBOL_GPL(usb_gen_phy_init); |
2319fb88 | 158 | |
53b6fc28 | 159 | void usb_gen_phy_shutdown(struct usb_phy *phy) |
2319fb88 | 160 | { |
4525beeb | 161 | struct usb_phy_generic *nop = dev_get_drvdata(phy->dev); |
2319fb88 | 162 | |
bd27fa44 RQ |
163 | /* Assert RESET */ |
164 | nop_reset_set(nop, 1); | |
ad63ebfc | 165 | |
2319fb88 | 166 | if (!IS_ERR(nop->clk)) |
4d175f34 | 167 | clk_disable_unprepare(nop->clk); |
58f735fe RQ |
168 | |
169 | if (!IS_ERR(nop->vcc)) { | |
170 | if (regulator_disable(nop->vcc)) | |
171 | dev_err(phy->dev, "Failed to disable power\n"); | |
172 | } | |
2319fb88 | 173 | } |
53b6fc28 | 174 | EXPORT_SYMBOL_GPL(usb_gen_phy_shutdown); |
2319fb88 | 175 | |
41adf109 | 176 | static int nop_set_peripheral(struct usb_otg *otg, struct usb_gadget *gadget) |
f6d92a05 | 177 | { |
41adf109 | 178 | if (!otg) |
f6d92a05 AKG |
179 | return -ENODEV; |
180 | ||
f6d92a05 | 181 | if (!gadget) { |
41adf109 | 182 | otg->gadget = NULL; |
f6d92a05 AKG |
183 | return -ENODEV; |
184 | } | |
185 | ||
41adf109 | 186 | otg->gadget = gadget; |
e47d9254 | 187 | otg->state = OTG_STATE_B_IDLE; |
f6d92a05 AKG |
188 | return 0; |
189 | } | |
190 | ||
41adf109 | 191 | static int nop_set_host(struct usb_otg *otg, struct usb_bus *host) |
f6d92a05 | 192 | { |
41adf109 | 193 | if (!otg) |
f6d92a05 AKG |
194 | return -ENODEV; |
195 | ||
f6d92a05 | 196 | if (!host) { |
41adf109 | 197 | otg->host = NULL; |
f6d92a05 AKG |
198 | return -ENODEV; |
199 | } | |
200 | ||
41adf109 | 201 | otg->host = host; |
f6d92a05 AKG |
202 | return 0; |
203 | } | |
204 | ||
4525beeb FB |
205 | int usb_phy_gen_create_phy(struct device *dev, struct usb_phy_generic *nop, |
206 | struct usb_phy_generic_platform_data *pdata) | |
f6d92a05 | 207 | { |
af9f51c5 | 208 | enum usb_phy_type type = USB_PHY_TYPE_USB2; |
e9f2cefb | 209 | int err = 0; |
f6d92a05 | 210 | |
af9f51c5 FB |
211 | u32 clk_rate = 0; |
212 | bool needs_vcc = false; | |
213 | ||
af9f51c5 FB |
214 | if (dev->of_node) { |
215 | struct device_node *node = dev->of_node; | |
af9f51c5 FB |
216 | |
217 | if (of_property_read_u32(node, "clock-frequency", &clk_rate)) | |
218 | clk_rate = 0; | |
219 | ||
220 | needs_vcc = of_property_read_bool(node, "vcc-supply"); | |
da89dba1 | 221 | nop->gpiod_reset = devm_gpiod_get_optional(dev, "reset-gpios"); |
e9f2cefb | 222 | err = PTR_ERR(nop->gpiod_reset); |
7acc9973 | 223 | if (!err) { |
da89dba1 | 224 | nop->gpiod_vbus = devm_gpiod_get_optional(dev, |
7acc9973 RJ |
225 | "vbus-detect-gpio"); |
226 | err = PTR_ERR(nop->gpiod_vbus); | |
227 | } | |
af9f51c5 FB |
228 | } else if (pdata) { |
229 | type = pdata->type; | |
230 | clk_rate = pdata->clk_rate; | |
231 | needs_vcc = pdata->needs_vcc; | |
7acc9973 | 232 | if (gpio_is_valid(pdata->gpio_reset)) { |
e9f2cefb RJ |
233 | err = devm_gpio_request_one(dev, pdata->gpio_reset, 0, |
234 | dev_name(dev)); | |
235 | if (!err) | |
236 | nop->gpiod_reset = | |
237 | gpio_to_desc(pdata->gpio_reset); | |
238 | } | |
7acc9973 | 239 | nop->gpiod_vbus = pdata->gpiod_vbus; |
e9f2cefb RJ |
240 | } |
241 | ||
242 | if (err == -EPROBE_DEFER) | |
243 | return -EPROBE_DEFER; | |
244 | if (err) { | |
245 | dev_err(dev, "Error requesting RESET GPIO\n"); | |
246 | return err; | |
af9f51c5 FB |
247 | } |
248 | ||
53b6fc28 SAS |
249 | nop->phy.otg = devm_kzalloc(dev, sizeof(*nop->phy.otg), |
250 | GFP_KERNEL); | |
e4d7dc66 | 251 | if (!nop->phy.otg) |
41adf109 | 252 | return -ENOMEM; |
41adf109 | 253 | |
53b6fc28 | 254 | nop->clk = devm_clk_get(dev, "main_clk"); |
2319fb88 | 255 | if (IS_ERR(nop->clk)) { |
53b6fc28 | 256 | dev_dbg(dev, "Can't get phy clock: %ld\n", |
2319fb88 RQ |
257 | PTR_ERR(nop->clk)); |
258 | } | |
259 | ||
0eba3879 RQ |
260 | if (!IS_ERR(nop->clk) && clk_rate) { |
261 | err = clk_set_rate(nop->clk, clk_rate); | |
2319fb88 | 262 | if (err) { |
53b6fc28 | 263 | dev_err(dev, "Error setting clock rate\n"); |
2319fb88 RQ |
264 | return err; |
265 | } | |
266 | } | |
267 | ||
53b6fc28 | 268 | nop->vcc = devm_regulator_get(dev, "vcc"); |
58f735fe | 269 | if (IS_ERR(nop->vcc)) { |
53b6fc28 | 270 | dev_dbg(dev, "Error getting vcc regulator: %ld\n", |
58f735fe | 271 | PTR_ERR(nop->vcc)); |
b54b5f56 RQ |
272 | if (needs_vcc) |
273 | return -EPROBE_DEFER; | |
58f735fe RQ |
274 | } |
275 | ||
53b6fc28 | 276 | nop->dev = dev; |
41adf109 HK |
277 | nop->phy.dev = nop->dev; |
278 | nop->phy.label = "nop-xceiv"; | |
279 | nop->phy.set_suspend = nop_set_suspend; | |
90f4232f | 280 | nop->phy.type = type; |
41adf109 | 281 | |
e47d9254 | 282 | nop->phy.otg->state = OTG_STATE_UNDEFINED; |
19c1eac2 | 283 | nop->phy.otg->usb_phy = &nop->phy; |
41adf109 HK |
284 | nop->phy.otg->set_host = nop_set_host; |
285 | nop->phy.otg->set_peripheral = nop_set_peripheral; | |
286 | ||
53b6fc28 SAS |
287 | return 0; |
288 | } | |
289 | EXPORT_SYMBOL_GPL(usb_phy_gen_create_phy); | |
290 | ||
4525beeb | 291 | static int usb_phy_generic_probe(struct platform_device *pdev) |
53b6fc28 SAS |
292 | { |
293 | struct device *dev = &pdev->dev; | |
4525beeb | 294 | struct usb_phy_generic *nop; |
53b6fc28 | 295 | int err; |
bd27fa44 RQ |
296 | |
297 | nop = devm_kzalloc(dev, sizeof(*nop), GFP_KERNEL); | |
298 | if (!nop) | |
299 | return -ENOMEM; | |
300 | ||
af9f51c5 | 301 | err = usb_phy_gen_create_phy(dev, nop, dev_get_platdata(&pdev->dev)); |
53b6fc28 SAS |
302 | if (err) |
303 | return err; | |
7acc9973 RJ |
304 | if (nop->gpiod_vbus) { |
305 | err = devm_request_threaded_irq(&pdev->dev, | |
306 | gpiod_to_irq(nop->gpiod_vbus), | |
307 | NULL, nop_gpio_vbus_thread, | |
308 | VBUS_IRQ_FLAGS, "vbus_detect", | |
309 | nop); | |
310 | if (err) { | |
311 | dev_err(&pdev->dev, "can't request irq %i, err: %d\n", | |
312 | gpiod_to_irq(nop->gpiod_vbus), err); | |
313 | return err; | |
314 | } | |
315 | } | |
53b6fc28 SAS |
316 | |
317 | nop->phy.init = usb_gen_phy_init; | |
318 | nop->phy.shutdown = usb_gen_phy_shutdown; | |
319 | ||
90f4232f | 320 | err = usb_add_phy_dev(&nop->phy); |
f6d92a05 AKG |
321 | if (err) { |
322 | dev_err(&pdev->dev, "can't register transceiver, err: %d\n", | |
323 | err); | |
4d175f34 | 324 | return err; |
f6d92a05 AKG |
325 | } |
326 | ||
327 | platform_set_drvdata(pdev, nop); | |
328 | ||
329 | return 0; | |
f6d92a05 AKG |
330 | } |
331 | ||
4525beeb | 332 | static int usb_phy_generic_remove(struct platform_device *pdev) |
f6d92a05 | 333 | { |
4525beeb | 334 | struct usb_phy_generic *nop = platform_get_drvdata(pdev); |
f6d92a05 | 335 | |
662dca54 | 336 | usb_remove_phy(&nop->phy); |
f6d92a05 | 337 | |
f6d92a05 AKG |
338 | return 0; |
339 | } | |
340 | ||
0eba3879 RQ |
341 | static const struct of_device_id nop_xceiv_dt_ids[] = { |
342 | { .compatible = "usb-nop-xceiv" }, | |
343 | { } | |
344 | }; | |
345 | ||
346 | MODULE_DEVICE_TABLE(of, nop_xceiv_dt_ids); | |
347 | ||
4525beeb FB |
348 | static struct platform_driver usb_phy_generic_driver = { |
349 | .probe = usb_phy_generic_probe, | |
350 | .remove = usb_phy_generic_remove, | |
f6d92a05 | 351 | .driver = { |
4525beeb | 352 | .name = "usb_phy_generic", |
5462b0db | 353 | .of_match_table = nop_xceiv_dt_ids, |
f6d92a05 AKG |
354 | }, |
355 | }; | |
356 | ||
4525beeb | 357 | static int __init usb_phy_generic_init(void) |
f6d92a05 | 358 | { |
4525beeb | 359 | return platform_driver_register(&usb_phy_generic_driver); |
f6d92a05 | 360 | } |
4525beeb | 361 | subsys_initcall(usb_phy_generic_init); |
f6d92a05 | 362 | |
4525beeb | 363 | static void __exit usb_phy_generic_exit(void) |
f6d92a05 | 364 | { |
4525beeb | 365 | platform_driver_unregister(&usb_phy_generic_driver); |
f6d92a05 | 366 | } |
4525beeb | 367 | module_exit(usb_phy_generic_exit); |
f6d92a05 | 368 | |
4525beeb | 369 | MODULE_ALIAS("platform:usb_phy_generic"); |
f6d92a05 AKG |
370 | MODULE_AUTHOR("Texas Instruments Inc"); |
371 | MODULE_DESCRIPTION("NOP USB Transceiver driver"); | |
372 | MODULE_LICENSE("GPL"); |