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277164f0 NZ |
1 | /* |
2 | * Copyright (C) 2011 Marvell International Ltd. All rights reserved. | |
3 | * Author: Chao Xie <chao.xie@marvell.com> | |
4 | * Neil Zhang <zhangwm@marvell.com> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License as published by the | |
8 | * Free Software Foundation; either version 2 of the License, or (at your | |
9 | * option) any later version. | |
10 | */ | |
11 | ||
12 | #include <linux/module.h> | |
13 | #include <linux/kernel.h> | |
14 | #include <linux/init.h> | |
15 | #include <linux/io.h> | |
16 | #include <linux/uaccess.h> | |
17 | #include <linux/device.h> | |
18 | #include <linux/proc_fs.h> | |
19 | #include <linux/clk.h> | |
20 | #include <linux/workqueue.h> | |
21 | #include <linux/platform_device.h> | |
22 | ||
23 | #include <linux/usb.h> | |
24 | #include <linux/usb/ch9.h> | |
25 | #include <linux/usb/otg.h> | |
26 | #include <linux/usb/gadget.h> | |
27 | #include <linux/usb/hcd.h> | |
28 | #include <linux/platform_data/mv_usb.h> | |
29 | ||
30 | #include "mv_otg.h" | |
31 | ||
32 | #define DRIVER_DESC "Marvell USB OTG transceiver driver" | |
33 | #define DRIVER_VERSION "Jan 20, 2010" | |
34 | ||
35 | MODULE_DESCRIPTION(DRIVER_DESC); | |
36 | MODULE_VERSION(DRIVER_VERSION); | |
37 | MODULE_LICENSE("GPL"); | |
38 | ||
39 | static const char driver_name[] = "mv-otg"; | |
40 | ||
41 | static char *state_string[] = { | |
42 | "undefined", | |
43 | "b_idle", | |
44 | "b_srp_init", | |
45 | "b_peripheral", | |
46 | "b_wait_acon", | |
47 | "b_host", | |
48 | "a_idle", | |
49 | "a_wait_vrise", | |
50 | "a_wait_bcon", | |
51 | "a_host", | |
52 | "a_suspend", | |
53 | "a_peripheral", | |
54 | "a_wait_vfall", | |
55 | "a_vbus_err" | |
56 | }; | |
57 | ||
b1c711d6 | 58 | static int mv_otg_set_vbus(struct usb_otg *otg, bool on) |
277164f0 | 59 | { |
b1c711d6 | 60 | struct mv_otg *mvotg = container_of(otg->phy, struct mv_otg, phy); |
277164f0 NZ |
61 | if (mvotg->pdata->set_vbus == NULL) |
62 | return -ENODEV; | |
63 | ||
64 | return mvotg->pdata->set_vbus(on); | |
65 | } | |
66 | ||
b1c711d6 | 67 | static int mv_otg_set_host(struct usb_otg *otg, |
277164f0 NZ |
68 | struct usb_bus *host) |
69 | { | |
70 | otg->host = host; | |
71 | ||
72 | return 0; | |
73 | } | |
74 | ||
b1c711d6 | 75 | static int mv_otg_set_peripheral(struct usb_otg *otg, |
277164f0 NZ |
76 | struct usb_gadget *gadget) |
77 | { | |
78 | otg->gadget = gadget; | |
79 | ||
80 | return 0; | |
81 | } | |
82 | ||
83 | static void mv_otg_run_state_machine(struct mv_otg *mvotg, | |
84 | unsigned long delay) | |
85 | { | |
86 | dev_dbg(&mvotg->pdev->dev, "transceiver is updated\n"); | |
87 | if (!mvotg->qwork) | |
88 | return; | |
89 | ||
90 | queue_delayed_work(mvotg->qwork, &mvotg->work, delay); | |
91 | } | |
92 | ||
93 | static void mv_otg_timer_await_bcon(unsigned long data) | |
94 | { | |
95 | struct mv_otg *mvotg = (struct mv_otg *) data; | |
96 | ||
97 | mvotg->otg_ctrl.a_wait_bcon_timeout = 1; | |
98 | ||
99 | dev_info(&mvotg->pdev->dev, "B Device No Response!\n"); | |
100 | ||
101 | if (spin_trylock(&mvotg->wq_lock)) { | |
102 | mv_otg_run_state_machine(mvotg, 0); | |
103 | spin_unlock(&mvotg->wq_lock); | |
104 | } | |
105 | } | |
106 | ||
107 | static int mv_otg_cancel_timer(struct mv_otg *mvotg, unsigned int id) | |
108 | { | |
109 | struct timer_list *timer; | |
110 | ||
111 | if (id >= OTG_TIMER_NUM) | |
112 | return -EINVAL; | |
113 | ||
114 | timer = &mvotg->otg_ctrl.timer[id]; | |
115 | ||
116 | if (timer_pending(timer)) | |
117 | del_timer(timer); | |
118 | ||
119 | return 0; | |
120 | } | |
121 | ||
122 | static int mv_otg_set_timer(struct mv_otg *mvotg, unsigned int id, | |
123 | unsigned long interval, | |
124 | void (*callback) (unsigned long)) | |
125 | { | |
126 | struct timer_list *timer; | |
127 | ||
128 | if (id >= OTG_TIMER_NUM) | |
129 | return -EINVAL; | |
130 | ||
131 | timer = &mvotg->otg_ctrl.timer[id]; | |
132 | if (timer_pending(timer)) { | |
133 | dev_err(&mvotg->pdev->dev, "Timer%d is already running\n", id); | |
134 | return -EBUSY; | |
135 | } | |
136 | ||
137 | init_timer(timer); | |
138 | timer->data = (unsigned long) mvotg; | |
139 | timer->function = callback; | |
140 | timer->expires = jiffies + interval; | |
141 | add_timer(timer); | |
142 | ||
143 | return 0; | |
144 | } | |
145 | ||
146 | static int mv_otg_reset(struct mv_otg *mvotg) | |
147 | { | |
148 | unsigned int loops; | |
149 | u32 tmp; | |
150 | ||
151 | /* Stop the controller */ | |
152 | tmp = readl(&mvotg->op_regs->usbcmd); | |
153 | tmp &= ~USBCMD_RUN_STOP; | |
154 | writel(tmp, &mvotg->op_regs->usbcmd); | |
155 | ||
156 | /* Reset the controller to get default values */ | |
157 | writel(USBCMD_CTRL_RESET, &mvotg->op_regs->usbcmd); | |
158 | ||
159 | loops = 500; | |
160 | while (readl(&mvotg->op_regs->usbcmd) & USBCMD_CTRL_RESET) { | |
161 | if (loops == 0) { | |
162 | dev_err(&mvotg->pdev->dev, | |
163 | "Wait for RESET completed TIMEOUT\n"); | |
164 | return -ETIMEDOUT; | |
165 | } | |
166 | loops--; | |
167 | udelay(20); | |
168 | } | |
169 | ||
170 | writel(0x0, &mvotg->op_regs->usbintr); | |
171 | tmp = readl(&mvotg->op_regs->usbsts); | |
172 | writel(tmp, &mvotg->op_regs->usbsts); | |
173 | ||
174 | return 0; | |
175 | } | |
176 | ||
177 | static void mv_otg_init_irq(struct mv_otg *mvotg) | |
178 | { | |
179 | u32 otgsc; | |
180 | ||
181 | mvotg->irq_en = OTGSC_INTR_A_SESSION_VALID | |
182 | | OTGSC_INTR_A_VBUS_VALID; | |
183 | mvotg->irq_status = OTGSC_INTSTS_A_SESSION_VALID | |
184 | | OTGSC_INTSTS_A_VBUS_VALID; | |
185 | ||
186 | if (mvotg->pdata->vbus == NULL) { | |
187 | mvotg->irq_en |= OTGSC_INTR_B_SESSION_VALID | |
188 | | OTGSC_INTR_B_SESSION_END; | |
189 | mvotg->irq_status |= OTGSC_INTSTS_B_SESSION_VALID | |
190 | | OTGSC_INTSTS_B_SESSION_END; | |
191 | } | |
192 | ||
193 | if (mvotg->pdata->id == NULL) { | |
194 | mvotg->irq_en |= OTGSC_INTR_USB_ID; | |
195 | mvotg->irq_status |= OTGSC_INTSTS_USB_ID; | |
196 | } | |
197 | ||
198 | otgsc = readl(&mvotg->op_regs->otgsc); | |
199 | otgsc |= mvotg->irq_en; | |
200 | writel(otgsc, &mvotg->op_regs->otgsc); | |
201 | } | |
202 | ||
203 | static void mv_otg_start_host(struct mv_otg *mvotg, int on) | |
204 | { | |
2053c2d1 | 205 | #ifdef CONFIG_USB |
b1c711d6 | 206 | struct usb_otg *otg = mvotg->phy.otg; |
277164f0 NZ |
207 | struct usb_hcd *hcd; |
208 | ||
209 | if (!otg->host) | |
210 | return; | |
211 | ||
212 | dev_info(&mvotg->pdev->dev, "%s host\n", on ? "start" : "stop"); | |
213 | ||
214 | hcd = bus_to_hcd(otg->host); | |
215 | ||
216 | if (on) | |
217 | usb_add_hcd(hcd, hcd->irq, IRQF_SHARED); | |
218 | else | |
219 | usb_remove_hcd(hcd); | |
2053c2d1 | 220 | #endif /* CONFIG_USB */ |
277164f0 NZ |
221 | } |
222 | ||
223 | static void mv_otg_start_periphrals(struct mv_otg *mvotg, int on) | |
224 | { | |
b1c711d6 | 225 | struct usb_otg *otg = mvotg->phy.otg; |
277164f0 NZ |
226 | |
227 | if (!otg->gadget) | |
228 | return; | |
229 | ||
b1c711d6 | 230 | dev_info(mvotg->phy.dev, "gadget %s\n", on ? "on" : "off"); |
277164f0 NZ |
231 | |
232 | if (on) | |
233 | usb_gadget_vbus_connect(otg->gadget); | |
234 | else | |
235 | usb_gadget_vbus_disconnect(otg->gadget); | |
236 | } | |
237 | ||
238 | static void otg_clock_enable(struct mv_otg *mvotg) | |
239 | { | |
240 | unsigned int i; | |
241 | ||
242 | for (i = 0; i < mvotg->clknum; i++) | |
243 | clk_enable(mvotg->clk[i]); | |
244 | } | |
245 | ||
246 | static void otg_clock_disable(struct mv_otg *mvotg) | |
247 | { | |
248 | unsigned int i; | |
249 | ||
250 | for (i = 0; i < mvotg->clknum; i++) | |
251 | clk_disable(mvotg->clk[i]); | |
252 | } | |
253 | ||
254 | static int mv_otg_enable_internal(struct mv_otg *mvotg) | |
255 | { | |
256 | int retval = 0; | |
257 | ||
258 | if (mvotg->active) | |
259 | return 0; | |
260 | ||
261 | dev_dbg(&mvotg->pdev->dev, "otg enabled\n"); | |
262 | ||
263 | otg_clock_enable(mvotg); | |
264 | if (mvotg->pdata->phy_init) { | |
265 | retval = mvotg->pdata->phy_init(mvotg->phy_regs); | |
266 | if (retval) { | |
267 | dev_err(&mvotg->pdev->dev, | |
268 | "init phy error %d\n", retval); | |
269 | otg_clock_disable(mvotg); | |
270 | return retval; | |
271 | } | |
272 | } | |
273 | mvotg->active = 1; | |
274 | ||
275 | return 0; | |
276 | ||
277 | } | |
278 | ||
279 | static int mv_otg_enable(struct mv_otg *mvotg) | |
280 | { | |
281 | if (mvotg->clock_gating) | |
282 | return mv_otg_enable_internal(mvotg); | |
283 | ||
284 | return 0; | |
285 | } | |
286 | ||
287 | static void mv_otg_disable_internal(struct mv_otg *mvotg) | |
288 | { | |
289 | if (mvotg->active) { | |
290 | dev_dbg(&mvotg->pdev->dev, "otg disabled\n"); | |
291 | if (mvotg->pdata->phy_deinit) | |
292 | mvotg->pdata->phy_deinit(mvotg->phy_regs); | |
293 | otg_clock_disable(mvotg); | |
294 | mvotg->active = 0; | |
295 | } | |
296 | } | |
297 | ||
298 | static void mv_otg_disable(struct mv_otg *mvotg) | |
299 | { | |
300 | if (mvotg->clock_gating) | |
301 | mv_otg_disable_internal(mvotg); | |
302 | } | |
303 | ||
304 | static void mv_otg_update_inputs(struct mv_otg *mvotg) | |
305 | { | |
306 | struct mv_otg_ctrl *otg_ctrl = &mvotg->otg_ctrl; | |
307 | u32 otgsc; | |
308 | ||
309 | otgsc = readl(&mvotg->op_regs->otgsc); | |
310 | ||
311 | if (mvotg->pdata->vbus) { | |
312 | if (mvotg->pdata->vbus->poll() == VBUS_HIGH) { | |
313 | otg_ctrl->b_sess_vld = 1; | |
314 | otg_ctrl->b_sess_end = 0; | |
315 | } else { | |
316 | otg_ctrl->b_sess_vld = 0; | |
317 | otg_ctrl->b_sess_end = 1; | |
318 | } | |
319 | } else { | |
320 | otg_ctrl->b_sess_vld = !!(otgsc & OTGSC_STS_B_SESSION_VALID); | |
321 | otg_ctrl->b_sess_end = !!(otgsc & OTGSC_STS_B_SESSION_END); | |
322 | } | |
323 | ||
324 | if (mvotg->pdata->id) | |
325 | otg_ctrl->id = !!mvotg->pdata->id->poll(); | |
326 | else | |
327 | otg_ctrl->id = !!(otgsc & OTGSC_STS_USB_ID); | |
328 | ||
329 | if (mvotg->pdata->otg_force_a_bus_req && !otg_ctrl->id) | |
330 | otg_ctrl->a_bus_req = 1; | |
331 | ||
332 | otg_ctrl->a_sess_vld = !!(otgsc & OTGSC_STS_A_SESSION_VALID); | |
333 | otg_ctrl->a_vbus_vld = !!(otgsc & OTGSC_STS_A_VBUS_VALID); | |
334 | ||
335 | dev_dbg(&mvotg->pdev->dev, "%s: ", __func__); | |
336 | dev_dbg(&mvotg->pdev->dev, "id %d\n", otg_ctrl->id); | |
337 | dev_dbg(&mvotg->pdev->dev, "b_sess_vld %d\n", otg_ctrl->b_sess_vld); | |
338 | dev_dbg(&mvotg->pdev->dev, "b_sess_end %d\n", otg_ctrl->b_sess_end); | |
339 | dev_dbg(&mvotg->pdev->dev, "a_vbus_vld %d\n", otg_ctrl->a_vbus_vld); | |
340 | dev_dbg(&mvotg->pdev->dev, "a_sess_vld %d\n", otg_ctrl->a_sess_vld); | |
341 | } | |
342 | ||
343 | static void mv_otg_update_state(struct mv_otg *mvotg) | |
344 | { | |
345 | struct mv_otg_ctrl *otg_ctrl = &mvotg->otg_ctrl; | |
b1c711d6 HK |
346 | struct usb_phy *phy = &mvotg->phy; |
347 | int old_state = phy->state; | |
277164f0 NZ |
348 | |
349 | switch (old_state) { | |
350 | case OTG_STATE_UNDEFINED: | |
b1c711d6 | 351 | phy->state = OTG_STATE_B_IDLE; |
277164f0 NZ |
352 | /* FALL THROUGH */ |
353 | case OTG_STATE_B_IDLE: | |
354 | if (otg_ctrl->id == 0) | |
b1c711d6 | 355 | phy->state = OTG_STATE_A_IDLE; |
277164f0 | 356 | else if (otg_ctrl->b_sess_vld) |
b1c711d6 | 357 | phy->state = OTG_STATE_B_PERIPHERAL; |
277164f0 NZ |
358 | break; |
359 | case OTG_STATE_B_PERIPHERAL: | |
360 | if (!otg_ctrl->b_sess_vld || otg_ctrl->id == 0) | |
b1c711d6 | 361 | phy->state = OTG_STATE_B_IDLE; |
277164f0 NZ |
362 | break; |
363 | case OTG_STATE_A_IDLE: | |
364 | if (otg_ctrl->id) | |
b1c711d6 | 365 | phy->state = OTG_STATE_B_IDLE; |
277164f0 NZ |
366 | else if (!(otg_ctrl->a_bus_drop) && |
367 | (otg_ctrl->a_bus_req || otg_ctrl->a_srp_det)) | |
b1c711d6 | 368 | phy->state = OTG_STATE_A_WAIT_VRISE; |
277164f0 NZ |
369 | break; |
370 | case OTG_STATE_A_WAIT_VRISE: | |
371 | if (otg_ctrl->a_vbus_vld) | |
b1c711d6 | 372 | phy->state = OTG_STATE_A_WAIT_BCON; |
277164f0 NZ |
373 | break; |
374 | case OTG_STATE_A_WAIT_BCON: | |
375 | if (otg_ctrl->id || otg_ctrl->a_bus_drop | |
376 | || otg_ctrl->a_wait_bcon_timeout) { | |
377 | mv_otg_cancel_timer(mvotg, A_WAIT_BCON_TIMER); | |
378 | mvotg->otg_ctrl.a_wait_bcon_timeout = 0; | |
b1c711d6 | 379 | phy->state = OTG_STATE_A_WAIT_VFALL; |
277164f0 NZ |
380 | otg_ctrl->a_bus_req = 0; |
381 | } else if (!otg_ctrl->a_vbus_vld) { | |
382 | mv_otg_cancel_timer(mvotg, A_WAIT_BCON_TIMER); | |
383 | mvotg->otg_ctrl.a_wait_bcon_timeout = 0; | |
b1c711d6 | 384 | phy->state = OTG_STATE_A_VBUS_ERR; |
277164f0 NZ |
385 | } else if (otg_ctrl->b_conn) { |
386 | mv_otg_cancel_timer(mvotg, A_WAIT_BCON_TIMER); | |
387 | mvotg->otg_ctrl.a_wait_bcon_timeout = 0; | |
b1c711d6 | 388 | phy->state = OTG_STATE_A_HOST; |
277164f0 NZ |
389 | } |
390 | break; | |
391 | case OTG_STATE_A_HOST: | |
392 | if (otg_ctrl->id || !otg_ctrl->b_conn | |
393 | || otg_ctrl->a_bus_drop) | |
b1c711d6 | 394 | phy->state = OTG_STATE_A_WAIT_BCON; |
277164f0 | 395 | else if (!otg_ctrl->a_vbus_vld) |
b1c711d6 | 396 | phy->state = OTG_STATE_A_VBUS_ERR; |
277164f0 NZ |
397 | break; |
398 | case OTG_STATE_A_WAIT_VFALL: | |
399 | if (otg_ctrl->id | |
400 | || (!otg_ctrl->b_conn && otg_ctrl->a_sess_vld) | |
401 | || otg_ctrl->a_bus_req) | |
b1c711d6 | 402 | phy->state = OTG_STATE_A_IDLE; |
277164f0 NZ |
403 | break; |
404 | case OTG_STATE_A_VBUS_ERR: | |
405 | if (otg_ctrl->id || otg_ctrl->a_clr_err | |
406 | || otg_ctrl->a_bus_drop) { | |
407 | otg_ctrl->a_clr_err = 0; | |
b1c711d6 | 408 | phy->state = OTG_STATE_A_WAIT_VFALL; |
277164f0 NZ |
409 | } |
410 | break; | |
411 | default: | |
412 | break; | |
413 | } | |
414 | } | |
415 | ||
416 | static void mv_otg_work(struct work_struct *work) | |
417 | { | |
418 | struct mv_otg *mvotg; | |
b1c711d6 HK |
419 | struct usb_phy *phy; |
420 | struct usb_otg *otg; | |
277164f0 NZ |
421 | int old_state; |
422 | ||
423 | mvotg = container_of((struct delayed_work *)work, struct mv_otg, work); | |
424 | ||
425 | run: | |
426 | /* work queue is single thread, or we need spin_lock to protect */ | |
b1c711d6 HK |
427 | phy = &mvotg->phy; |
428 | otg = phy->otg; | |
429 | old_state = phy->state; | |
277164f0 NZ |
430 | |
431 | if (!mvotg->active) | |
432 | return; | |
433 | ||
434 | mv_otg_update_inputs(mvotg); | |
435 | mv_otg_update_state(mvotg); | |
436 | ||
b1c711d6 | 437 | if (old_state != phy->state) { |
277164f0 NZ |
438 | dev_info(&mvotg->pdev->dev, "change from state %s to %s\n", |
439 | state_string[old_state], | |
b1c711d6 | 440 | state_string[phy->state]); |
277164f0 | 441 | |
b1c711d6 | 442 | switch (phy->state) { |
277164f0 | 443 | case OTG_STATE_B_IDLE: |
b1c711d6 | 444 | otg->default_a = 0; |
277164f0 NZ |
445 | if (old_state == OTG_STATE_B_PERIPHERAL) |
446 | mv_otg_start_periphrals(mvotg, 0); | |
447 | mv_otg_reset(mvotg); | |
448 | mv_otg_disable(mvotg); | |
449 | break; | |
450 | case OTG_STATE_B_PERIPHERAL: | |
451 | mv_otg_enable(mvotg); | |
452 | mv_otg_start_periphrals(mvotg, 1); | |
453 | break; | |
454 | case OTG_STATE_A_IDLE: | |
b1c711d6 | 455 | otg->default_a = 1; |
277164f0 NZ |
456 | mv_otg_enable(mvotg); |
457 | if (old_state == OTG_STATE_A_WAIT_VFALL) | |
458 | mv_otg_start_host(mvotg, 0); | |
459 | mv_otg_reset(mvotg); | |
460 | break; | |
461 | case OTG_STATE_A_WAIT_VRISE: | |
b1c711d6 | 462 | mv_otg_set_vbus(otg, 1); |
277164f0 NZ |
463 | break; |
464 | case OTG_STATE_A_WAIT_BCON: | |
465 | if (old_state != OTG_STATE_A_HOST) | |
466 | mv_otg_start_host(mvotg, 1); | |
467 | mv_otg_set_timer(mvotg, A_WAIT_BCON_TIMER, | |
468 | T_A_WAIT_BCON, | |
469 | mv_otg_timer_await_bcon); | |
470 | /* | |
471 | * Now, we directly enter A_HOST. So set b_conn = 1 | |
472 | * here. In fact, it need host driver to notify us. | |
473 | */ | |
474 | mvotg->otg_ctrl.b_conn = 1; | |
475 | break; | |
476 | case OTG_STATE_A_HOST: | |
477 | break; | |
478 | case OTG_STATE_A_WAIT_VFALL: | |
479 | /* | |
480 | * Now, we has exited A_HOST. So set b_conn = 0 | |
481 | * here. In fact, it need host driver to notify us. | |
482 | */ | |
483 | mvotg->otg_ctrl.b_conn = 0; | |
b1c711d6 | 484 | mv_otg_set_vbus(otg, 0); |
277164f0 NZ |
485 | break; |
486 | case OTG_STATE_A_VBUS_ERR: | |
487 | break; | |
488 | default: | |
489 | break; | |
490 | } | |
491 | goto run; | |
492 | } | |
493 | } | |
494 | ||
495 | static irqreturn_t mv_otg_irq(int irq, void *dev) | |
496 | { | |
497 | struct mv_otg *mvotg = dev; | |
498 | u32 otgsc; | |
499 | ||
500 | otgsc = readl(&mvotg->op_regs->otgsc); | |
501 | writel(otgsc, &mvotg->op_regs->otgsc); | |
502 | ||
503 | /* | |
504 | * if we have vbus, then the vbus detection for B-device | |
505 | * will be done by mv_otg_inputs_irq(). | |
506 | */ | |
507 | if (mvotg->pdata->vbus) | |
508 | if ((otgsc & OTGSC_STS_USB_ID) && | |
509 | !(otgsc & OTGSC_INTSTS_USB_ID)) | |
510 | return IRQ_NONE; | |
511 | ||
512 | if ((otgsc & mvotg->irq_status) == 0) | |
513 | return IRQ_NONE; | |
514 | ||
515 | mv_otg_run_state_machine(mvotg, 0); | |
516 | ||
517 | return IRQ_HANDLED; | |
518 | } | |
519 | ||
520 | static irqreturn_t mv_otg_inputs_irq(int irq, void *dev) | |
521 | { | |
522 | struct mv_otg *mvotg = dev; | |
523 | ||
524 | /* The clock may disabled at this time */ | |
525 | if (!mvotg->active) { | |
526 | mv_otg_enable(mvotg); | |
527 | mv_otg_init_irq(mvotg); | |
528 | } | |
529 | ||
530 | mv_otg_run_state_machine(mvotg, 0); | |
531 | ||
532 | return IRQ_HANDLED; | |
533 | } | |
534 | ||
535 | static ssize_t | |
536 | get_a_bus_req(struct device *dev, struct device_attribute *attr, char *buf) | |
537 | { | |
538 | struct mv_otg *mvotg = dev_get_drvdata(dev); | |
539 | return scnprintf(buf, PAGE_SIZE, "%d\n", | |
540 | mvotg->otg_ctrl.a_bus_req); | |
541 | } | |
542 | ||
543 | static ssize_t | |
544 | set_a_bus_req(struct device *dev, struct device_attribute *attr, | |
545 | const char *buf, size_t count) | |
546 | { | |
547 | struct mv_otg *mvotg = dev_get_drvdata(dev); | |
548 | ||
549 | if (count > 2) | |
550 | return -1; | |
551 | ||
552 | /* We will use this interface to change to A device */ | |
b1c711d6 HK |
553 | if (mvotg->phy.state != OTG_STATE_B_IDLE |
554 | && mvotg->phy.state != OTG_STATE_A_IDLE) | |
277164f0 NZ |
555 | return -1; |
556 | ||
557 | /* The clock may disabled and we need to set irq for ID detected */ | |
558 | mv_otg_enable(mvotg); | |
559 | mv_otg_init_irq(mvotg); | |
560 | ||
561 | if (buf[0] == '1') { | |
562 | mvotg->otg_ctrl.a_bus_req = 1; | |
563 | mvotg->otg_ctrl.a_bus_drop = 0; | |
564 | dev_dbg(&mvotg->pdev->dev, | |
565 | "User request: a_bus_req = 1\n"); | |
566 | ||
567 | if (spin_trylock(&mvotg->wq_lock)) { | |
568 | mv_otg_run_state_machine(mvotg, 0); | |
569 | spin_unlock(&mvotg->wq_lock); | |
570 | } | |
571 | } | |
572 | ||
573 | return count; | |
574 | } | |
575 | ||
576 | static DEVICE_ATTR(a_bus_req, S_IRUGO | S_IWUSR, get_a_bus_req, | |
577 | set_a_bus_req); | |
578 | ||
579 | static ssize_t | |
580 | set_a_clr_err(struct device *dev, struct device_attribute *attr, | |
581 | const char *buf, size_t count) | |
582 | { | |
583 | struct mv_otg *mvotg = dev_get_drvdata(dev); | |
b1c711d6 | 584 | if (!mvotg->phy.otg->default_a) |
277164f0 NZ |
585 | return -1; |
586 | ||
587 | if (count > 2) | |
588 | return -1; | |
589 | ||
590 | if (buf[0] == '1') { | |
591 | mvotg->otg_ctrl.a_clr_err = 1; | |
592 | dev_dbg(&mvotg->pdev->dev, | |
593 | "User request: a_clr_err = 1\n"); | |
594 | } | |
595 | ||
596 | if (spin_trylock(&mvotg->wq_lock)) { | |
597 | mv_otg_run_state_machine(mvotg, 0); | |
598 | spin_unlock(&mvotg->wq_lock); | |
599 | } | |
600 | ||
601 | return count; | |
602 | } | |
603 | ||
604 | static DEVICE_ATTR(a_clr_err, S_IWUSR, NULL, set_a_clr_err); | |
605 | ||
606 | static ssize_t | |
607 | get_a_bus_drop(struct device *dev, struct device_attribute *attr, | |
608 | char *buf) | |
609 | { | |
610 | struct mv_otg *mvotg = dev_get_drvdata(dev); | |
611 | return scnprintf(buf, PAGE_SIZE, "%d\n", | |
612 | mvotg->otg_ctrl.a_bus_drop); | |
613 | } | |
614 | ||
615 | static ssize_t | |
616 | set_a_bus_drop(struct device *dev, struct device_attribute *attr, | |
617 | const char *buf, size_t count) | |
618 | { | |
619 | struct mv_otg *mvotg = dev_get_drvdata(dev); | |
b1c711d6 | 620 | if (!mvotg->phy.otg->default_a) |
277164f0 NZ |
621 | return -1; |
622 | ||
623 | if (count > 2) | |
624 | return -1; | |
625 | ||
626 | if (buf[0] == '0') { | |
627 | mvotg->otg_ctrl.a_bus_drop = 0; | |
628 | dev_dbg(&mvotg->pdev->dev, | |
629 | "User request: a_bus_drop = 0\n"); | |
630 | } else if (buf[0] == '1') { | |
631 | mvotg->otg_ctrl.a_bus_drop = 1; | |
632 | mvotg->otg_ctrl.a_bus_req = 0; | |
633 | dev_dbg(&mvotg->pdev->dev, | |
634 | "User request: a_bus_drop = 1\n"); | |
635 | dev_dbg(&mvotg->pdev->dev, | |
636 | "User request: and a_bus_req = 0\n"); | |
637 | } | |
638 | ||
639 | if (spin_trylock(&mvotg->wq_lock)) { | |
640 | mv_otg_run_state_machine(mvotg, 0); | |
641 | spin_unlock(&mvotg->wq_lock); | |
642 | } | |
643 | ||
644 | return count; | |
645 | } | |
646 | ||
647 | static DEVICE_ATTR(a_bus_drop, S_IRUGO | S_IWUSR, | |
648 | get_a_bus_drop, set_a_bus_drop); | |
649 | ||
650 | static struct attribute *inputs_attrs[] = { | |
651 | &dev_attr_a_bus_req.attr, | |
652 | &dev_attr_a_clr_err.attr, | |
653 | &dev_attr_a_bus_drop.attr, | |
654 | NULL, | |
655 | }; | |
656 | ||
657 | static struct attribute_group inputs_attr_group = { | |
658 | .name = "inputs", | |
659 | .attrs = inputs_attrs, | |
660 | }; | |
661 | ||
662 | int mv_otg_remove(struct platform_device *pdev) | |
663 | { | |
664 | struct mv_otg *mvotg = platform_get_drvdata(pdev); | |
665 | int clk_i; | |
666 | ||
667 | sysfs_remove_group(&mvotg->pdev->dev.kobj, &inputs_attr_group); | |
668 | ||
669 | if (mvotg->irq) | |
670 | free_irq(mvotg->irq, mvotg); | |
671 | ||
672 | if (mvotg->pdata->vbus) | |
673 | free_irq(mvotg->pdata->vbus->irq, mvotg); | |
674 | if (mvotg->pdata->id) | |
675 | free_irq(mvotg->pdata->id->irq, mvotg); | |
676 | ||
677 | if (mvotg->qwork) { | |
678 | flush_workqueue(mvotg->qwork); | |
679 | destroy_workqueue(mvotg->qwork); | |
680 | } | |
681 | ||
682 | mv_otg_disable(mvotg); | |
683 | ||
684 | if (mvotg->cap_regs) | |
685 | iounmap(mvotg->cap_regs); | |
686 | ||
687 | if (mvotg->phy_regs) | |
688 | iounmap(mvotg->phy_regs); | |
689 | ||
690 | for (clk_i = 0; clk_i <= mvotg->clknum; clk_i++) | |
691 | clk_put(mvotg->clk[clk_i]); | |
692 | ||
662dca54 | 693 | usb_remove_phy(&mvotg->phy); |
277164f0 NZ |
694 | platform_set_drvdata(pdev, NULL); |
695 | ||
b1c711d6 | 696 | kfree(mvotg->phy.otg); |
277164f0 NZ |
697 | kfree(mvotg); |
698 | ||
699 | return 0; | |
700 | } | |
701 | ||
702 | static int mv_otg_probe(struct platform_device *pdev) | |
703 | { | |
704 | struct mv_usb_platform_data *pdata = pdev->dev.platform_data; | |
705 | struct mv_otg *mvotg; | |
b1c711d6 | 706 | struct usb_otg *otg; |
277164f0 NZ |
707 | struct resource *r; |
708 | int retval = 0, clk_i, i; | |
709 | size_t size; | |
710 | ||
711 | if (pdata == NULL) { | |
712 | dev_err(&pdev->dev, "failed to get platform data\n"); | |
713 | return -ENODEV; | |
714 | } | |
715 | ||
716 | size = sizeof(*mvotg) + sizeof(struct clk *) * pdata->clknum; | |
717 | mvotg = kzalloc(size, GFP_KERNEL); | |
718 | if (!mvotg) { | |
719 | dev_err(&pdev->dev, "failed to allocate memory!\n"); | |
720 | return -ENOMEM; | |
721 | } | |
722 | ||
b1c711d6 HK |
723 | otg = kzalloc(sizeof *otg, GFP_KERNEL); |
724 | if (!otg) { | |
725 | kfree(mvotg); | |
726 | return -ENOMEM; | |
727 | } | |
728 | ||
277164f0 NZ |
729 | platform_set_drvdata(pdev, mvotg); |
730 | ||
731 | mvotg->pdev = pdev; | |
732 | mvotg->pdata = pdata; | |
733 | ||
734 | mvotg->clknum = pdata->clknum; | |
735 | for (clk_i = 0; clk_i < mvotg->clknum; clk_i++) { | |
736 | mvotg->clk[clk_i] = clk_get(&pdev->dev, pdata->clkname[clk_i]); | |
737 | if (IS_ERR(mvotg->clk[clk_i])) { | |
738 | retval = PTR_ERR(mvotg->clk[clk_i]); | |
739 | goto err_put_clk; | |
740 | } | |
741 | } | |
742 | ||
743 | mvotg->qwork = create_singlethread_workqueue("mv_otg_queue"); | |
744 | if (!mvotg->qwork) { | |
745 | dev_dbg(&pdev->dev, "cannot create workqueue for OTG\n"); | |
746 | retval = -ENOMEM; | |
747 | goto err_put_clk; | |
748 | } | |
749 | ||
750 | INIT_DELAYED_WORK(&mvotg->work, mv_otg_work); | |
751 | ||
752 | /* OTG common part */ | |
753 | mvotg->pdev = pdev; | |
b1c711d6 HK |
754 | mvotg->phy.dev = &pdev->dev; |
755 | mvotg->phy.otg = otg; | |
756 | mvotg->phy.label = driver_name; | |
757 | mvotg->phy.state = OTG_STATE_UNDEFINED; | |
758 | ||
759 | otg->phy = &mvotg->phy; | |
760 | otg->set_host = mv_otg_set_host; | |
761 | otg->set_peripheral = mv_otg_set_peripheral; | |
762 | otg->set_vbus = mv_otg_set_vbus; | |
277164f0 NZ |
763 | |
764 | for (i = 0; i < OTG_TIMER_NUM; i++) | |
765 | init_timer(&mvotg->otg_ctrl.timer[i]); | |
766 | ||
767 | r = platform_get_resource_byname(mvotg->pdev, | |
768 | IORESOURCE_MEM, "phyregs"); | |
769 | if (r == NULL) { | |
770 | dev_err(&pdev->dev, "no phy I/O memory resource defined\n"); | |
771 | retval = -ENODEV; | |
772 | goto err_destroy_workqueue; | |
773 | } | |
774 | ||
775 | mvotg->phy_regs = ioremap(r->start, resource_size(r)); | |
776 | if (mvotg->phy_regs == NULL) { | |
777 | dev_err(&pdev->dev, "failed to map phy I/O memory\n"); | |
778 | retval = -EFAULT; | |
779 | goto err_destroy_workqueue; | |
780 | } | |
781 | ||
782 | r = platform_get_resource_byname(mvotg->pdev, | |
783 | IORESOURCE_MEM, "capregs"); | |
784 | if (r == NULL) { | |
785 | dev_err(&pdev->dev, "no I/O memory resource defined\n"); | |
786 | retval = -ENODEV; | |
787 | goto err_unmap_phyreg; | |
788 | } | |
789 | ||
790 | mvotg->cap_regs = ioremap(r->start, resource_size(r)); | |
791 | if (mvotg->cap_regs == NULL) { | |
792 | dev_err(&pdev->dev, "failed to map I/O memory\n"); | |
793 | retval = -EFAULT; | |
794 | goto err_unmap_phyreg; | |
795 | } | |
796 | ||
797 | /* we will acces controller register, so enable the udc controller */ | |
798 | retval = mv_otg_enable_internal(mvotg); | |
799 | if (retval) { | |
800 | dev_err(&pdev->dev, "mv otg enable error %d\n", retval); | |
801 | goto err_unmap_capreg; | |
802 | } | |
803 | ||
804 | mvotg->op_regs = | |
805 | (struct mv_otg_regs __iomem *) ((unsigned long) mvotg->cap_regs | |
806 | + (readl(mvotg->cap_regs) & CAPLENGTH_MASK)); | |
807 | ||
808 | if (pdata->id) { | |
809 | retval = request_threaded_irq(pdata->id->irq, NULL, | |
810 | mv_otg_inputs_irq, | |
811 | IRQF_ONESHOT, "id", mvotg); | |
812 | if (retval) { | |
813 | dev_info(&pdev->dev, | |
814 | "Failed to request irq for ID\n"); | |
815 | pdata->id = NULL; | |
816 | } | |
817 | } | |
818 | ||
819 | if (pdata->vbus) { | |
820 | mvotg->clock_gating = 1; | |
821 | retval = request_threaded_irq(pdata->vbus->irq, NULL, | |
822 | mv_otg_inputs_irq, | |
823 | IRQF_ONESHOT, "vbus", mvotg); | |
824 | if (retval) { | |
825 | dev_info(&pdev->dev, | |
826 | "Failed to request irq for VBUS, " | |
827 | "disable clock gating\n"); | |
828 | mvotg->clock_gating = 0; | |
829 | pdata->vbus = NULL; | |
830 | } | |
831 | } | |
832 | ||
833 | if (pdata->disable_otg_clock_gating) | |
834 | mvotg->clock_gating = 0; | |
835 | ||
836 | mv_otg_reset(mvotg); | |
837 | mv_otg_init_irq(mvotg); | |
838 | ||
839 | r = platform_get_resource(mvotg->pdev, IORESOURCE_IRQ, 0); | |
840 | if (r == NULL) { | |
841 | dev_err(&pdev->dev, "no IRQ resource defined\n"); | |
842 | retval = -ENODEV; | |
843 | goto err_disable_clk; | |
844 | } | |
845 | ||
846 | mvotg->irq = r->start; | |
847 | if (request_irq(mvotg->irq, mv_otg_irq, IRQF_SHARED, | |
848 | driver_name, mvotg)) { | |
849 | dev_err(&pdev->dev, "Request irq %d for OTG failed\n", | |
850 | mvotg->irq); | |
851 | mvotg->irq = 0; | |
852 | retval = -ENODEV; | |
853 | goto err_disable_clk; | |
854 | } | |
855 | ||
662dca54 | 856 | retval = usb_add_phy(&mvotg->phy, USB_PHY_TYPE_USB2); |
277164f0 NZ |
857 | if (retval < 0) { |
858 | dev_err(&pdev->dev, "can't register transceiver, %d\n", | |
859 | retval); | |
860 | goto err_free_irq; | |
861 | } | |
862 | ||
863 | retval = sysfs_create_group(&pdev->dev.kobj, &inputs_attr_group); | |
864 | if (retval < 0) { | |
865 | dev_dbg(&pdev->dev, | |
866 | "Can't register sysfs attr group: %d\n", retval); | |
867 | goto err_set_transceiver; | |
868 | } | |
869 | ||
870 | spin_lock_init(&mvotg->wq_lock); | |
871 | if (spin_trylock(&mvotg->wq_lock)) { | |
872 | mv_otg_run_state_machine(mvotg, 2 * HZ); | |
873 | spin_unlock(&mvotg->wq_lock); | |
874 | } | |
875 | ||
876 | dev_info(&pdev->dev, | |
877 | "successful probe OTG device %s clock gating.\n", | |
878 | mvotg->clock_gating ? "with" : "without"); | |
879 | ||
880 | return 0; | |
881 | ||
882 | err_set_transceiver: | |
662dca54 | 883 | usb_remove_phy(&mvotg->phy); |
277164f0 NZ |
884 | err_free_irq: |
885 | free_irq(mvotg->irq, mvotg); | |
886 | err_disable_clk: | |
887 | if (pdata->vbus) | |
888 | free_irq(pdata->vbus->irq, mvotg); | |
889 | if (pdata->id) | |
890 | free_irq(pdata->id->irq, mvotg); | |
891 | mv_otg_disable_internal(mvotg); | |
892 | err_unmap_capreg: | |
893 | iounmap(mvotg->cap_regs); | |
894 | err_unmap_phyreg: | |
895 | iounmap(mvotg->phy_regs); | |
896 | err_destroy_workqueue: | |
897 | flush_workqueue(mvotg->qwork); | |
898 | destroy_workqueue(mvotg->qwork); | |
899 | err_put_clk: | |
900 | for (clk_i--; clk_i >= 0; clk_i--) | |
901 | clk_put(mvotg->clk[clk_i]); | |
902 | ||
903 | platform_set_drvdata(pdev, NULL); | |
b1c711d6 | 904 | kfree(otg); |
277164f0 NZ |
905 | kfree(mvotg); |
906 | ||
907 | return retval; | |
908 | } | |
909 | ||
910 | #ifdef CONFIG_PM | |
911 | static int mv_otg_suspend(struct platform_device *pdev, pm_message_t state) | |
912 | { | |
913 | struct mv_otg *mvotg = platform_get_drvdata(pdev); | |
914 | ||
b1c711d6 | 915 | if (mvotg->phy.state != OTG_STATE_B_IDLE) { |
277164f0 NZ |
916 | dev_info(&pdev->dev, |
917 | "OTG state is not B_IDLE, it is %d!\n", | |
b1c711d6 | 918 | mvotg->phy.state); |
277164f0 NZ |
919 | return -EAGAIN; |
920 | } | |
921 | ||
922 | if (!mvotg->clock_gating) | |
923 | mv_otg_disable_internal(mvotg); | |
924 | ||
925 | return 0; | |
926 | } | |
927 | ||
928 | static int mv_otg_resume(struct platform_device *pdev) | |
929 | { | |
930 | struct mv_otg *mvotg = platform_get_drvdata(pdev); | |
931 | u32 otgsc; | |
932 | ||
933 | if (!mvotg->clock_gating) { | |
934 | mv_otg_enable_internal(mvotg); | |
935 | ||
936 | otgsc = readl(&mvotg->op_regs->otgsc); | |
937 | otgsc |= mvotg->irq_en; | |
938 | writel(otgsc, &mvotg->op_regs->otgsc); | |
939 | ||
940 | if (spin_trylock(&mvotg->wq_lock)) { | |
941 | mv_otg_run_state_machine(mvotg, 0); | |
942 | spin_unlock(&mvotg->wq_lock); | |
943 | } | |
944 | } | |
945 | return 0; | |
946 | } | |
947 | #endif | |
948 | ||
949 | static struct platform_driver mv_otg_driver = { | |
950 | .probe = mv_otg_probe, | |
951 | .remove = __exit_p(mv_otg_remove), | |
952 | .driver = { | |
953 | .owner = THIS_MODULE, | |
954 | .name = driver_name, | |
955 | }, | |
956 | #ifdef CONFIG_PM | |
957 | .suspend = mv_otg_suspend, | |
958 | .resume = mv_otg_resume, | |
959 | #endif | |
960 | }; | |
961 | ||
962 | static int __init mv_otg_init(void) | |
963 | { | |
964 | return platform_driver_register(&mv_otg_driver); | |
965 | } | |
966 | ||
967 | static void __exit mv_otg_exit(void) | |
968 | { | |
969 | platform_driver_unregister(&mv_otg_driver); | |
970 | } | |
971 | ||
972 | module_init(mv_otg_init); | |
973 | module_exit(mv_otg_exit); |