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9ba96ae5 AK |
1 | /* |
2 | * Tahvo USB transceiver driver | |
3 | * | |
4 | * Copyright (C) 2005-2006 Nokia Corporation | |
5 | * | |
6 | * Parts copied from isp1301_omap.c. | |
7 | * Copyright (C) 2004 Texas Instruments | |
8 | * Copyright (C) 2004 David Brownell | |
9 | * | |
10 | * Original driver written by Juha Yrjölä, Tony Lindgren and Timo Teräs. | |
11 | * Modified for Retu/Tahvo MFD by Aaro Koskinen. | |
12 | * | |
13 | * This file is subject to the terms and conditions of the GNU General | |
14 | * Public License. See the file "COPYING" in the main directory of this | |
15 | * archive for more details. | |
16 | * | |
17 | * This program is distributed in the hope that it will be useful, | |
18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | * GNU General Public License for more details. | |
21 | */ | |
22 | ||
23 | #include <linux/io.h> | |
24 | #include <linux/clk.h> | |
25 | #include <linux/usb.h> | |
26 | #include <linux/extcon.h> | |
27 | #include <linux/kernel.h> | |
28 | #include <linux/module.h> | |
29 | #include <linux/usb/otg.h> | |
30 | #include <linux/mfd/retu.h> | |
31 | #include <linux/usb/gadget.h> | |
32 | #include <linux/platform_device.h> | |
33 | ||
34 | #define DRIVER_NAME "tahvo-usb" | |
35 | ||
36 | #define TAHVO_REG_IDSR 0x02 | |
37 | #define TAHVO_REG_USBR 0x06 | |
38 | ||
39 | #define USBR_SLAVE_CONTROL (1 << 8) | |
40 | #define USBR_VPPVIO_SW (1 << 7) | |
41 | #define USBR_SPEED (1 << 6) | |
42 | #define USBR_REGOUT (1 << 5) | |
43 | #define USBR_MASTER_SW2 (1 << 4) | |
44 | #define USBR_MASTER_SW1 (1 << 3) | |
45 | #define USBR_SLAVE_SW (1 << 2) | |
46 | #define USBR_NSUSPEND (1 << 1) | |
47 | #define USBR_SEMODE (1 << 0) | |
48 | ||
49 | #define TAHVO_MODE_HOST 0 | |
50 | #define TAHVO_MODE_PERIPHERAL 1 | |
51 | ||
52 | struct tahvo_usb { | |
53 | struct platform_device *pt_dev; | |
54 | struct usb_phy phy; | |
55 | int vbus_state; | |
56 | struct mutex serialize; | |
57 | struct clk *ick; | |
58 | int irq; | |
59 | int tahvo_mode; | |
60 | struct extcon_dev extcon; | |
61 | }; | |
62 | ||
63 | static const char *tahvo_cable[] = { | |
64 | "USB-HOST", | |
65 | "USB", | |
66 | NULL, | |
67 | }; | |
68 | ||
69 | static ssize_t vbus_state_show(struct device *device, | |
70 | struct device_attribute *attr, char *buf) | |
71 | { | |
72 | struct tahvo_usb *tu = dev_get_drvdata(device); | |
73 | return sprintf(buf, "%s\n", tu->vbus_state ? "on" : "off"); | |
74 | } | |
75 | static DEVICE_ATTR(vbus, 0444, vbus_state_show, NULL); | |
76 | ||
77 | static void check_vbus_state(struct tahvo_usb *tu) | |
78 | { | |
79 | struct retu_dev *rdev = dev_get_drvdata(tu->pt_dev->dev.parent); | |
80 | int reg, prev_state; | |
81 | ||
82 | reg = retu_read(rdev, TAHVO_REG_IDSR); | |
83 | if (reg & TAHVO_STAT_VBUS) { | |
e47d9254 | 84 | switch (tu->phy.otg->state) { |
9ba96ae5 AK |
85 | case OTG_STATE_B_IDLE: |
86 | /* Enable the gadget driver */ | |
87 | if (tu->phy.otg->gadget) | |
88 | usb_gadget_vbus_connect(tu->phy.otg->gadget); | |
e47d9254 | 89 | tu->phy.otg->state = OTG_STATE_B_PERIPHERAL; |
b20f3f9e | 90 | usb_phy_set_event(&tu->phy, USB_EVENT_ENUMERATED); |
9ba96ae5 AK |
91 | break; |
92 | case OTG_STATE_A_IDLE: | |
93 | /* | |
94 | * Session is now valid assuming the USB hub is driving | |
95 | * Vbus. | |
96 | */ | |
e47d9254 | 97 | tu->phy.otg->state = OTG_STATE_A_HOST; |
9ba96ae5 AK |
98 | break; |
99 | default: | |
100 | break; | |
101 | } | |
102 | dev_info(&tu->pt_dev->dev, "USB cable connected\n"); | |
103 | } else { | |
e47d9254 | 104 | switch (tu->phy.otg->state) { |
9ba96ae5 AK |
105 | case OTG_STATE_B_PERIPHERAL: |
106 | if (tu->phy.otg->gadget) | |
107 | usb_gadget_vbus_disconnect(tu->phy.otg->gadget); | |
e47d9254 | 108 | tu->phy.otg->state = OTG_STATE_B_IDLE; |
b20f3f9e | 109 | usb_phy_set_event(&tu->phy, USB_EVENT_NONE); |
9ba96ae5 AK |
110 | break; |
111 | case OTG_STATE_A_HOST: | |
e47d9254 | 112 | tu->phy.otg->state = OTG_STATE_A_IDLE; |
9ba96ae5 AK |
113 | break; |
114 | default: | |
115 | break; | |
116 | } | |
117 | dev_info(&tu->pt_dev->dev, "USB cable disconnected\n"); | |
118 | } | |
119 | ||
120 | prev_state = tu->vbus_state; | |
121 | tu->vbus_state = reg & TAHVO_STAT_VBUS; | |
122 | if (prev_state != tu->vbus_state) { | |
123 | extcon_set_cable_state(&tu->extcon, "USB", tu->vbus_state); | |
124 | sysfs_notify(&tu->pt_dev->dev.kobj, NULL, "vbus_state"); | |
125 | } | |
126 | } | |
127 | ||
128 | static void tahvo_usb_become_host(struct tahvo_usb *tu) | |
129 | { | |
130 | struct retu_dev *rdev = dev_get_drvdata(tu->pt_dev->dev.parent); | |
131 | ||
132 | extcon_set_cable_state(&tu->extcon, "USB-HOST", true); | |
133 | ||
134 | /* Power up the transceiver in USB host mode */ | |
135 | retu_write(rdev, TAHVO_REG_USBR, USBR_REGOUT | USBR_NSUSPEND | | |
136 | USBR_MASTER_SW2 | USBR_MASTER_SW1); | |
e47d9254 | 137 | tu->phy.otg->state = OTG_STATE_A_IDLE; |
9ba96ae5 AK |
138 | |
139 | check_vbus_state(tu); | |
140 | } | |
141 | ||
142 | static void tahvo_usb_stop_host(struct tahvo_usb *tu) | |
143 | { | |
e47d9254 | 144 | tu->phy.otg->state = OTG_STATE_A_IDLE; |
9ba96ae5 AK |
145 | } |
146 | ||
147 | static void tahvo_usb_become_peripheral(struct tahvo_usb *tu) | |
148 | { | |
149 | struct retu_dev *rdev = dev_get_drvdata(tu->pt_dev->dev.parent); | |
150 | ||
151 | extcon_set_cable_state(&tu->extcon, "USB-HOST", false); | |
152 | ||
153 | /* Power up transceiver and set it in USB peripheral mode */ | |
154 | retu_write(rdev, TAHVO_REG_USBR, USBR_SLAVE_CONTROL | USBR_REGOUT | | |
155 | USBR_NSUSPEND | USBR_SLAVE_SW); | |
e47d9254 | 156 | tu->phy.otg->state = OTG_STATE_B_IDLE; |
9ba96ae5 AK |
157 | |
158 | check_vbus_state(tu); | |
159 | } | |
160 | ||
161 | static void tahvo_usb_stop_peripheral(struct tahvo_usb *tu) | |
162 | { | |
163 | if (tu->phy.otg->gadget) | |
164 | usb_gadget_vbus_disconnect(tu->phy.otg->gadget); | |
e47d9254 | 165 | tu->phy.otg->state = OTG_STATE_B_IDLE; |
9ba96ae5 AK |
166 | } |
167 | ||
168 | static void tahvo_usb_power_off(struct tahvo_usb *tu) | |
169 | { | |
170 | struct retu_dev *rdev = dev_get_drvdata(tu->pt_dev->dev.parent); | |
171 | ||
172 | /* Disable gadget controller if any */ | |
173 | if (tu->phy.otg->gadget) | |
174 | usb_gadget_vbus_disconnect(tu->phy.otg->gadget); | |
175 | ||
176 | /* Power off transceiver */ | |
177 | retu_write(rdev, TAHVO_REG_USBR, 0); | |
e47d9254 | 178 | tu->phy.otg->state = OTG_STATE_UNDEFINED; |
9ba96ae5 AK |
179 | } |
180 | ||
181 | static int tahvo_usb_set_suspend(struct usb_phy *dev, int suspend) | |
182 | { | |
183 | struct tahvo_usb *tu = container_of(dev, struct tahvo_usb, phy); | |
184 | struct retu_dev *rdev = dev_get_drvdata(tu->pt_dev->dev.parent); | |
185 | u16 w; | |
186 | ||
187 | dev_dbg(&tu->pt_dev->dev, "%s\n", __func__); | |
188 | ||
189 | w = retu_read(rdev, TAHVO_REG_USBR); | |
190 | if (suspend) | |
191 | w &= ~USBR_NSUSPEND; | |
192 | else | |
193 | w |= USBR_NSUSPEND; | |
194 | retu_write(rdev, TAHVO_REG_USBR, w); | |
195 | ||
196 | return 0; | |
197 | } | |
198 | ||
199 | static int tahvo_usb_set_host(struct usb_otg *otg, struct usb_bus *host) | |
200 | { | |
19c1eac2 AT |
201 | struct tahvo_usb *tu = container_of(otg->usb_phy, struct tahvo_usb, |
202 | phy); | |
9ba96ae5 AK |
203 | |
204 | dev_dbg(&tu->pt_dev->dev, "%s %p\n", __func__, host); | |
205 | ||
9ba96ae5 AK |
206 | mutex_lock(&tu->serialize); |
207 | ||
208 | if (host == NULL) { | |
209 | if (tu->tahvo_mode == TAHVO_MODE_HOST) | |
210 | tahvo_usb_power_off(tu); | |
211 | otg->host = NULL; | |
212 | mutex_unlock(&tu->serialize); | |
213 | return 0; | |
214 | } | |
215 | ||
216 | if (tu->tahvo_mode == TAHVO_MODE_HOST) { | |
217 | otg->host = NULL; | |
218 | tahvo_usb_become_host(tu); | |
219 | } | |
220 | ||
221 | otg->host = host; | |
222 | ||
223 | mutex_unlock(&tu->serialize); | |
224 | ||
225 | return 0; | |
226 | } | |
227 | ||
228 | static int tahvo_usb_set_peripheral(struct usb_otg *otg, | |
229 | struct usb_gadget *gadget) | |
230 | { | |
19c1eac2 AT |
231 | struct tahvo_usb *tu = container_of(otg->usb_phy, struct tahvo_usb, |
232 | phy); | |
9ba96ae5 AK |
233 | |
234 | dev_dbg(&tu->pt_dev->dev, "%s %p\n", __func__, gadget); | |
235 | ||
9ba96ae5 AK |
236 | mutex_lock(&tu->serialize); |
237 | ||
238 | if (!gadget) { | |
239 | if (tu->tahvo_mode == TAHVO_MODE_PERIPHERAL) | |
240 | tahvo_usb_power_off(tu); | |
241 | tu->phy.otg->gadget = NULL; | |
242 | mutex_unlock(&tu->serialize); | |
243 | return 0; | |
244 | } | |
245 | ||
246 | tu->phy.otg->gadget = gadget; | |
247 | if (tu->tahvo_mode == TAHVO_MODE_PERIPHERAL) | |
248 | tahvo_usb_become_peripheral(tu); | |
249 | ||
250 | mutex_unlock(&tu->serialize); | |
251 | ||
252 | return 0; | |
253 | } | |
254 | ||
255 | static irqreturn_t tahvo_usb_vbus_interrupt(int irq, void *_tu) | |
256 | { | |
257 | struct tahvo_usb *tu = _tu; | |
258 | ||
259 | mutex_lock(&tu->serialize); | |
260 | check_vbus_state(tu); | |
261 | mutex_unlock(&tu->serialize); | |
262 | ||
263 | return IRQ_HANDLED; | |
264 | } | |
265 | ||
266 | static ssize_t otg_mode_show(struct device *device, | |
267 | struct device_attribute *attr, char *buf) | |
268 | { | |
269 | struct tahvo_usb *tu = dev_get_drvdata(device); | |
270 | ||
271 | switch (tu->tahvo_mode) { | |
272 | case TAHVO_MODE_HOST: | |
273 | return sprintf(buf, "host\n"); | |
274 | case TAHVO_MODE_PERIPHERAL: | |
275 | return sprintf(buf, "peripheral\n"); | |
276 | } | |
277 | ||
278 | return -EINVAL; | |
279 | } | |
280 | ||
281 | static ssize_t otg_mode_store(struct device *device, | |
282 | struct device_attribute *attr, | |
283 | const char *buf, size_t count) | |
284 | { | |
285 | struct tahvo_usb *tu = dev_get_drvdata(device); | |
286 | int r; | |
287 | ||
288 | mutex_lock(&tu->serialize); | |
289 | if (count >= 4 && strncmp(buf, "host", 4) == 0) { | |
290 | if (tu->tahvo_mode == TAHVO_MODE_PERIPHERAL) | |
291 | tahvo_usb_stop_peripheral(tu); | |
292 | tu->tahvo_mode = TAHVO_MODE_HOST; | |
293 | if (tu->phy.otg->host) { | |
294 | dev_info(device, "HOST mode: host controller present\n"); | |
295 | tahvo_usb_become_host(tu); | |
296 | } else { | |
297 | dev_info(device, "HOST mode: no host controller, powering off\n"); | |
298 | tahvo_usb_power_off(tu); | |
299 | } | |
300 | r = strlen(buf); | |
301 | } else if (count >= 10 && strncmp(buf, "peripheral", 10) == 0) { | |
302 | if (tu->tahvo_mode == TAHVO_MODE_HOST) | |
303 | tahvo_usb_stop_host(tu); | |
304 | tu->tahvo_mode = TAHVO_MODE_PERIPHERAL; | |
305 | if (tu->phy.otg->gadget) { | |
306 | dev_info(device, "PERIPHERAL mode: gadget driver present\n"); | |
307 | tahvo_usb_become_peripheral(tu); | |
308 | } else { | |
309 | dev_info(device, "PERIPHERAL mode: no gadget driver, powering off\n"); | |
310 | tahvo_usb_power_off(tu); | |
311 | } | |
312 | r = strlen(buf); | |
313 | } else { | |
314 | r = -EINVAL; | |
315 | } | |
316 | mutex_unlock(&tu->serialize); | |
317 | ||
318 | return r; | |
319 | } | |
320 | static DEVICE_ATTR(otg_mode, 0644, otg_mode_show, otg_mode_store); | |
321 | ||
322 | static struct attribute *tahvo_attributes[] = { | |
323 | &dev_attr_vbus.attr, | |
324 | &dev_attr_otg_mode.attr, | |
325 | NULL | |
326 | }; | |
327 | ||
328 | static struct attribute_group tahvo_attr_group = { | |
329 | .attrs = tahvo_attributes, | |
330 | }; | |
331 | ||
332 | static int tahvo_usb_probe(struct platform_device *pdev) | |
333 | { | |
334 | struct retu_dev *rdev = dev_get_drvdata(pdev->dev.parent); | |
335 | struct tahvo_usb *tu; | |
336 | int ret; | |
337 | ||
338 | tu = devm_kzalloc(&pdev->dev, sizeof(*tu), GFP_KERNEL); | |
339 | if (!tu) | |
340 | return -ENOMEM; | |
341 | ||
342 | tu->phy.otg = devm_kzalloc(&pdev->dev, sizeof(*tu->phy.otg), | |
343 | GFP_KERNEL); | |
344 | if (!tu->phy.otg) | |
345 | return -ENOMEM; | |
346 | ||
347 | tu->pt_dev = pdev; | |
348 | ||
349 | /* Default mode */ | |
350 | #ifdef CONFIG_TAHVO_USB_HOST_BY_DEFAULT | |
351 | tu->tahvo_mode = TAHVO_MODE_HOST; | |
352 | #else | |
353 | tu->tahvo_mode = TAHVO_MODE_PERIPHERAL; | |
354 | #endif | |
355 | ||
356 | mutex_init(&tu->serialize); | |
357 | ||
358 | tu->ick = devm_clk_get(&pdev->dev, "usb_l4_ick"); | |
359 | if (!IS_ERR(tu->ick)) | |
360 | clk_enable(tu->ick); | |
361 | ||
362 | /* | |
363 | * Set initial state, so that we generate kevents only on state changes. | |
364 | */ | |
365 | tu->vbus_state = retu_read(rdev, TAHVO_REG_IDSR) & TAHVO_STAT_VBUS; | |
366 | ||
367 | tu->extcon.name = DRIVER_NAME; | |
368 | tu->extcon.supported_cable = tahvo_cable; | |
369 | tu->extcon.dev.parent = &pdev->dev; | |
370 | ||
371 | ret = extcon_dev_register(&tu->extcon); | |
372 | if (ret) { | |
373 | dev_err(&pdev->dev, "could not register extcon device: %d\n", | |
374 | ret); | |
375 | goto err_disable_clk; | |
376 | } | |
377 | ||
378 | /* Set the initial cable state. */ | |
379 | extcon_set_cable_state(&tu->extcon, "USB-HOST", | |
380 | tu->tahvo_mode == TAHVO_MODE_HOST); | |
381 | extcon_set_cable_state(&tu->extcon, "USB", tu->vbus_state); | |
382 | ||
383 | /* Create OTG interface */ | |
384 | tahvo_usb_power_off(tu); | |
385 | tu->phy.dev = &pdev->dev; | |
e47d9254 | 386 | tu->phy.otg->state = OTG_STATE_UNDEFINED; |
9ba96ae5 AK |
387 | tu->phy.label = DRIVER_NAME; |
388 | tu->phy.set_suspend = tahvo_usb_set_suspend; | |
389 | ||
19c1eac2 | 390 | tu->phy.otg->usb_phy = &tu->phy; |
9ba96ae5 AK |
391 | tu->phy.otg->set_host = tahvo_usb_set_host; |
392 | tu->phy.otg->set_peripheral = tahvo_usb_set_peripheral; | |
393 | ||
394 | ret = usb_add_phy(&tu->phy, USB_PHY_TYPE_USB2); | |
395 | if (ret < 0) { | |
396 | dev_err(&pdev->dev, "cannot register USB transceiver: %d\n", | |
397 | ret); | |
398 | goto err_extcon_unreg; | |
399 | } | |
400 | ||
401 | dev_set_drvdata(&pdev->dev, tu); | |
402 | ||
403 | tu->irq = platform_get_irq(pdev, 0); | |
a81df9ee FE |
404 | ret = request_threaded_irq(tu->irq, NULL, tahvo_usb_vbus_interrupt, |
405 | IRQF_ONESHOT, | |
9ba96ae5 AK |
406 | "tahvo-vbus", tu); |
407 | if (ret) { | |
408 | dev_err(&pdev->dev, "could not register tahvo-vbus irq: %d\n", | |
409 | ret); | |
410 | goto err_remove_phy; | |
411 | } | |
412 | ||
413 | /* Attributes */ | |
414 | ret = sysfs_create_group(&pdev->dev.kobj, &tahvo_attr_group); | |
415 | if (ret) { | |
416 | dev_err(&pdev->dev, "cannot create sysfs group: %d\n", ret); | |
417 | goto err_free_irq; | |
418 | } | |
419 | ||
420 | return 0; | |
421 | ||
422 | err_free_irq: | |
423 | free_irq(tu->irq, tu); | |
424 | err_remove_phy: | |
425 | usb_remove_phy(&tu->phy); | |
426 | err_extcon_unreg: | |
427 | extcon_dev_unregister(&tu->extcon); | |
428 | err_disable_clk: | |
429 | if (!IS_ERR(tu->ick)) | |
430 | clk_disable(tu->ick); | |
431 | ||
432 | return ret; | |
433 | } | |
434 | ||
435 | static int tahvo_usb_remove(struct platform_device *pdev) | |
436 | { | |
437 | struct tahvo_usb *tu = platform_get_drvdata(pdev); | |
438 | ||
439 | sysfs_remove_group(&pdev->dev.kobj, &tahvo_attr_group); | |
440 | free_irq(tu->irq, tu); | |
441 | usb_remove_phy(&tu->phy); | |
442 | extcon_dev_unregister(&tu->extcon); | |
443 | if (!IS_ERR(tu->ick)) | |
444 | clk_disable(tu->ick); | |
445 | ||
446 | return 0; | |
447 | } | |
448 | ||
449 | static struct platform_driver tahvo_usb_driver = { | |
450 | .probe = tahvo_usb_probe, | |
451 | .remove = tahvo_usb_remove, | |
452 | .driver = { | |
453 | .name = "tahvo-usb", | |
9ba96ae5 AK |
454 | }, |
455 | }; | |
456 | module_platform_driver(tahvo_usb_driver); | |
457 | ||
458 | MODULE_DESCRIPTION("Tahvo USB transceiver driver"); | |
459 | MODULE_LICENSE("GPL"); | |
460 | MODULE_AUTHOR("Juha Yrjölä, Tony Lindgren, and Timo Teräs"); | |
461 | MODULE_AUTHOR("Aaro Koskinen <aaro.koskinen@iki.fi>"); |