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usb: musb: OMAP4430: Fix usb device detection if connected during boot
[deliverable/linux.git] / drivers / usb / musb / omap2430.c
1 /*
2 * Copyright (C) 2005-2007 by Texas Instruments
3 * Some code has been taken from tusb6010.c
4 * Copyrights for that are attributable to:
5 * Copyright (C) 2006 Nokia Corporation
6 * Tony Lindgren <tony@atomide.com>
7 *
8 * This file is part of the Inventra Controller Driver for Linux.
9 *
10 * The Inventra Controller Driver for Linux is free software; you
11 * can redistribute it and/or modify it under the terms of the GNU
12 * General Public License version 2 as published by the Free Software
13 * Foundation.
14 *
15 * The Inventra Controller Driver for Linux is distributed in
16 * the hope that it will be useful, but WITHOUT ANY WARRANTY;
17 * without even the implied warranty of MERCHANTABILITY or
18 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
19 * License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with The Inventra Controller Driver for Linux ; if not,
23 * write to the Free Software Foundation, Inc., 59 Temple Place,
24 * Suite 330, Boston, MA 02111-1307 USA
25 *
26 */
27 #include <linux/module.h>
28 #include <linux/kernel.h>
29 #include <linux/sched.h>
30 #include <linux/init.h>
31 #include <linux/list.h>
32 #include <linux/clk.h>
33 #include <linux/io.h>
34 #include <linux/platform_device.h>
35 #include <linux/dma-mapping.h>
36 #include <linux/pm_runtime.h>
37 #include <linux/err.h>
38
39 #include "musb_core.h"
40 #include "omap2430.h"
41
42 struct omap2430_glue {
43 struct device *dev;
44 struct platform_device *musb;
45 };
46 #define glue_to_musb(g) platform_get_drvdata(g->musb)
47
48 static struct timer_list musb_idle_timer;
49
50 static void musb_do_idle(unsigned long _musb)
51 {
52 struct musb *musb = (void *)_musb;
53 unsigned long flags;
54 #ifdef CONFIG_USB_MUSB_HDRC_HCD
55 u8 power;
56 #endif
57 u8 devctl;
58
59 spin_lock_irqsave(&musb->lock, flags);
60
61 switch (musb->xceiv->state) {
62 case OTG_STATE_A_WAIT_BCON:
63
64 devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
65 if (devctl & MUSB_DEVCTL_BDEVICE) {
66 musb->xceiv->state = OTG_STATE_B_IDLE;
67 MUSB_DEV_MODE(musb);
68 } else {
69 musb->xceiv->state = OTG_STATE_A_IDLE;
70 MUSB_HST_MODE(musb);
71 }
72 break;
73 #ifdef CONFIG_USB_MUSB_HDRC_HCD
74 case OTG_STATE_A_SUSPEND:
75 /* finish RESUME signaling? */
76 if (musb->port1_status & MUSB_PORT_STAT_RESUME) {
77 power = musb_readb(musb->mregs, MUSB_POWER);
78 power &= ~MUSB_POWER_RESUME;
79 DBG(1, "root port resume stopped, power %02x\n", power);
80 musb_writeb(musb->mregs, MUSB_POWER, power);
81 musb->is_active = 1;
82 musb->port1_status &= ~(USB_PORT_STAT_SUSPEND
83 | MUSB_PORT_STAT_RESUME);
84 musb->port1_status |= USB_PORT_STAT_C_SUSPEND << 16;
85 usb_hcd_poll_rh_status(musb_to_hcd(musb));
86 /* NOTE: it might really be A_WAIT_BCON ... */
87 musb->xceiv->state = OTG_STATE_A_HOST;
88 }
89 break;
90 #endif
91 #ifdef CONFIG_USB_MUSB_HDRC_HCD
92 case OTG_STATE_A_HOST:
93 devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
94 if (devctl & MUSB_DEVCTL_BDEVICE)
95 musb->xceiv->state = OTG_STATE_B_IDLE;
96 else
97 musb->xceiv->state = OTG_STATE_A_WAIT_BCON;
98 #endif
99 default:
100 break;
101 }
102 spin_unlock_irqrestore(&musb->lock, flags);
103 }
104
105
106 static void omap2430_musb_try_idle(struct musb *musb, unsigned long timeout)
107 {
108 unsigned long default_timeout = jiffies + msecs_to_jiffies(3);
109 static unsigned long last_timer;
110
111 if (timeout == 0)
112 timeout = default_timeout;
113
114 /* Never idle if active, or when VBUS timeout is not set as host */
115 if (musb->is_active || ((musb->a_wait_bcon == 0)
116 && (musb->xceiv->state == OTG_STATE_A_WAIT_BCON))) {
117 DBG(4, "%s active, deleting timer\n", otg_state_string(musb));
118 del_timer(&musb_idle_timer);
119 last_timer = jiffies;
120 return;
121 }
122
123 if (time_after(last_timer, timeout)) {
124 if (!timer_pending(&musb_idle_timer))
125 last_timer = timeout;
126 else {
127 DBG(4, "Longer idle timer already pending, ignoring\n");
128 return;
129 }
130 }
131 last_timer = timeout;
132
133 DBG(4, "%s inactive, for idle timer for %lu ms\n",
134 otg_state_string(musb),
135 (unsigned long)jiffies_to_msecs(timeout - jiffies));
136 mod_timer(&musb_idle_timer, timeout);
137 }
138
139 static void omap2430_musb_set_vbus(struct musb *musb, int is_on)
140 {
141 u8 devctl;
142 unsigned long timeout = jiffies + msecs_to_jiffies(1000);
143 int ret = 1;
144 /* HDRC controls CPEN, but beware current surges during device
145 * connect. They can trigger transient overcurrent conditions
146 * that must be ignored.
147 */
148
149 devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
150
151 if (is_on) {
152 if (musb->xceiv->state == OTG_STATE_A_IDLE) {
153 /* start the session */
154 devctl |= MUSB_DEVCTL_SESSION;
155 musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
156 /*
157 * Wait for the musb to set as A device to enable the
158 * VBUS
159 */
160 while (musb_readb(musb->mregs, MUSB_DEVCTL) & 0x80) {
161
162 cpu_relax();
163
164 if (time_after(jiffies, timeout)) {
165 dev_err(musb->controller,
166 "configured as A device timeout");
167 ret = -EINVAL;
168 break;
169 }
170 }
171
172 if (ret && musb->xceiv->set_vbus)
173 otg_set_vbus(musb->xceiv, 1);
174 } else {
175 musb->is_active = 1;
176 musb->xceiv->default_a = 1;
177 musb->xceiv->state = OTG_STATE_A_WAIT_VRISE;
178 devctl |= MUSB_DEVCTL_SESSION;
179 MUSB_HST_MODE(musb);
180 }
181 } else {
182 musb->is_active = 0;
183
184 /* NOTE: we're skipping A_WAIT_VFALL -> A_IDLE and
185 * jumping right to B_IDLE...
186 */
187
188 musb->xceiv->default_a = 0;
189 musb->xceiv->state = OTG_STATE_B_IDLE;
190 devctl &= ~MUSB_DEVCTL_SESSION;
191
192 MUSB_DEV_MODE(musb);
193 }
194 musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
195
196 DBG(1, "VBUS %s, devctl %02x "
197 /* otg %3x conf %08x prcm %08x */ "\n",
198 otg_state_string(musb),
199 musb_readb(musb->mregs, MUSB_DEVCTL));
200 }
201
202 static int omap2430_musb_set_mode(struct musb *musb, u8 musb_mode)
203 {
204 u8 devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
205
206 devctl |= MUSB_DEVCTL_SESSION;
207 musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
208
209 return 0;
210 }
211
212 static inline void omap2430_low_level_exit(struct musb *musb)
213 {
214 u32 l;
215
216 /* in any role */
217 l = musb_readl(musb->mregs, OTG_FORCESTDBY);
218 l |= ENABLEFORCE; /* enable MSTANDBY */
219 musb_writel(musb->mregs, OTG_FORCESTDBY, l);
220 }
221
222 static inline void omap2430_low_level_init(struct musb *musb)
223 {
224 u32 l;
225
226 l = musb_readl(musb->mregs, OTG_FORCESTDBY);
227 l &= ~ENABLEFORCE; /* disable MSTANDBY */
228 musb_writel(musb->mregs, OTG_FORCESTDBY, l);
229 }
230
231 /* blocking notifier support */
232 static int musb_otg_notifications(struct notifier_block *nb,
233 unsigned long event, void *unused)
234 {
235 struct musb *musb = container_of(nb, struct musb, nb);
236 struct device *dev = musb->controller;
237 struct musb_hdrc_platform_data *pdata = dev->platform_data;
238 struct omap_musb_board_data *data = pdata->board_data;
239
240 switch (event) {
241 case USB_EVENT_ID:
242 DBG(4, "ID GND\n");
243
244 if (is_otg_enabled(musb)) {
245 #ifdef CONFIG_USB_GADGET_MUSB_HDRC
246 if (musb->gadget_driver) {
247 otg_init(musb->xceiv);
248
249 if (data->interface_type ==
250 MUSB_INTERFACE_UTMI)
251 omap2430_musb_set_vbus(musb, 1);
252
253 }
254 #endif
255 } else {
256 otg_init(musb->xceiv);
257 if (data->interface_type ==
258 MUSB_INTERFACE_UTMI)
259 omap2430_musb_set_vbus(musb, 1);
260 }
261 break;
262
263 case USB_EVENT_VBUS:
264 DBG(4, "VBUS Connect\n");
265
266 otg_init(musb->xceiv);
267 break;
268
269 case USB_EVENT_NONE:
270 DBG(4, "VBUS Disconnect\n");
271
272 if (data->interface_type == MUSB_INTERFACE_UTMI) {
273 if (musb->xceiv->set_vbus)
274 otg_set_vbus(musb->xceiv, 0);
275 }
276 otg_shutdown(musb->xceiv);
277 break;
278 default:
279 DBG(4, "ID float\n");
280 return NOTIFY_DONE;
281 }
282
283 return NOTIFY_OK;
284 }
285
286 static int omap2430_musb_init(struct musb *musb)
287 {
288 u32 l, status = 0;
289 struct device *dev = musb->controller;
290 struct musb_hdrc_platform_data *plat = dev->platform_data;
291 struct omap_musb_board_data *data = plat->board_data;
292
293 /* We require some kind of external transceiver, hooked
294 * up through ULPI. TWL4030-family PMICs include one,
295 * which needs a driver, drivers aren't always needed.
296 */
297 musb->xceiv = otg_get_transceiver();
298 if (!musb->xceiv) {
299 pr_err("HS USB OTG: no transceiver configured\n");
300 return -ENODEV;
301 }
302
303 omap2430_low_level_init(musb);
304
305 l = musb_readl(musb->mregs, OTG_INTERFSEL);
306
307 if (data->interface_type == MUSB_INTERFACE_UTMI) {
308 /* OMAP4 uses Internal PHY GS70 which uses UTMI interface */
309 l &= ~ULPI_12PIN; /* Disable ULPI */
310 l |= UTMI_8BIT; /* Enable UTMI */
311 } else {
312 l |= ULPI_12PIN;
313 }
314
315 musb_writel(musb->mregs, OTG_INTERFSEL, l);
316
317 pr_debug("HS USB OTG: revision 0x%x, sysconfig 0x%02x, "
318 "sysstatus 0x%x, intrfsel 0x%x, simenable 0x%x\n",
319 musb_readl(musb->mregs, OTG_REVISION),
320 musb_readl(musb->mregs, OTG_SYSCONFIG),
321 musb_readl(musb->mregs, OTG_SYSSTATUS),
322 musb_readl(musb->mregs, OTG_INTERFSEL),
323 musb_readl(musb->mregs, OTG_SIMENABLE));
324
325 musb->nb.notifier_call = musb_otg_notifications;
326 status = otg_register_notifier(musb->xceiv, &musb->nb);
327
328 if (status)
329 DBG(1, "notification register failed\n");
330
331 setup_timer(&musb_idle_timer, musb_do_idle, (unsigned long) musb);
332
333 return 0;
334 }
335
336 static void omap2430_musb_enable(struct musb *musb)
337 {
338 u8 devctl;
339 unsigned long timeout = jiffies + msecs_to_jiffies(1000);
340 struct device *dev = musb->controller;
341 struct musb_hdrc_platform_data *pdata = dev->platform_data;
342 struct omap_musb_board_data *data = pdata->board_data;
343
344 switch (musb->xceiv->last_event) {
345
346 case USB_EVENT_ID:
347 otg_init(musb->xceiv);
348 if (data->interface_type == MUSB_INTERFACE_UTMI) {
349 devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
350 /* start the session */
351 devctl |= MUSB_DEVCTL_SESSION;
352 musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
353 while (musb_readb(musb->mregs, MUSB_DEVCTL) &
354 MUSB_DEVCTL_BDEVICE) {
355 cpu_relax();
356
357 if (time_after(jiffies, timeout)) {
358 dev_err(musb->controller,
359 "configured as A device timeout");
360 break;
361 }
362 }
363 }
364 break;
365
366 case USB_EVENT_VBUS:
367 otg_init(musb->xceiv);
368 break;
369
370 default:
371 break;
372 }
373 }
374
375 static void omap2430_musb_disable(struct musb *musb)
376 {
377 if (musb->xceiv->last_event)
378 otg_shutdown(musb->xceiv);
379 }
380
381 static int omap2430_musb_exit(struct musb *musb)
382 {
383
384 omap2430_low_level_exit(musb);
385 otg_put_transceiver(musb->xceiv);
386
387 return 0;
388 }
389
390 static const struct musb_platform_ops omap2430_ops = {
391 .init = omap2430_musb_init,
392 .exit = omap2430_musb_exit,
393
394 .set_mode = omap2430_musb_set_mode,
395 .try_idle = omap2430_musb_try_idle,
396
397 .set_vbus = omap2430_musb_set_vbus,
398
399 .enable = omap2430_musb_enable,
400 .disable = omap2430_musb_disable,
401 };
402
403 static u64 omap2430_dmamask = DMA_BIT_MASK(32);
404
405 static int __init omap2430_probe(struct platform_device *pdev)
406 {
407 struct musb_hdrc_platform_data *pdata = pdev->dev.platform_data;
408 struct platform_device *musb;
409 struct omap2430_glue *glue;
410 int status = 0;
411
412 int ret = -ENOMEM;
413
414 glue = kzalloc(sizeof(*glue), GFP_KERNEL);
415 if (!glue) {
416 dev_err(&pdev->dev, "failed to allocate glue context\n");
417 goto err0;
418 }
419
420 musb = platform_device_alloc("musb-hdrc", -1);
421 if (!musb) {
422 dev_err(&pdev->dev, "failed to allocate musb device\n");
423 goto err1;
424 }
425
426 musb->dev.parent = &pdev->dev;
427 musb->dev.dma_mask = &omap2430_dmamask;
428 musb->dev.coherent_dma_mask = omap2430_dmamask;
429
430 glue->dev = &pdev->dev;
431 glue->musb = musb;
432
433 pdata->platform_ops = &omap2430_ops;
434
435 platform_set_drvdata(pdev, glue);
436
437 ret = platform_device_add_resources(musb, pdev->resource,
438 pdev->num_resources);
439 if (ret) {
440 dev_err(&pdev->dev, "failed to add resources\n");
441 goto err2;
442 }
443
444 ret = platform_device_add_data(musb, pdata, sizeof(*pdata));
445 if (ret) {
446 dev_err(&pdev->dev, "failed to add platform_data\n");
447 goto err2;
448 }
449
450 ret = platform_device_add(musb);
451 if (ret) {
452 dev_err(&pdev->dev, "failed to register musb device\n");
453 goto err2;
454 }
455
456 pm_runtime_enable(&pdev->dev);
457 status = pm_runtime_get_sync(&pdev->dev);
458 if (status < 0) {
459 dev_err(&pdev->dev, "pm_runtime_get_sync FAILED");
460 goto err3;
461 }
462
463 return 0;
464
465 err3:
466 pm_runtime_disable(&pdev->dev);
467 err2:
468 platform_device_put(musb);
469
470 err1:
471 kfree(glue);
472
473 err0:
474 return ret;
475 }
476
477 static int __exit omap2430_remove(struct platform_device *pdev)
478 {
479 struct omap2430_glue *glue = platform_get_drvdata(pdev);
480
481 platform_device_del(glue->musb);
482 platform_device_put(glue->musb);
483 pm_runtime_put(&pdev->dev);
484 pm_runtime_disable(&pdev->dev);
485 kfree(glue);
486
487 return 0;
488 }
489
490 #ifdef CONFIG_PM
491 static void omap2430_save_context(struct musb *musb)
492 {
493 musb->context.otg_forcestandby = musb_readl(musb->mregs, OTG_FORCESTDBY);
494 }
495
496 static void omap2430_restore_context(struct musb *musb)
497 {
498 musb_writel(musb->mregs, OTG_FORCESTDBY, musb->context.otg_forcestandby);
499 }
500
501 static int omap2430_suspend(struct device *dev)
502 {
503 struct omap2430_glue *glue = dev_get_drvdata(dev);
504 struct musb *musb = glue_to_musb(glue);
505
506 omap2430_low_level_exit(musb);
507 otg_set_suspend(musb->xceiv, 1);
508 omap2430_save_context(musb);
509
510 if (!pm_runtime_suspended(dev) && dev->bus && dev->bus->pm &&
511 dev->bus->pm->runtime_suspend)
512 dev->bus->pm->runtime_suspend(dev);
513
514 return 0;
515 }
516
517 static int omap2430_resume(struct device *dev)
518 {
519 struct omap2430_glue *glue = dev_get_drvdata(dev);
520 struct musb *musb = glue_to_musb(glue);
521
522 if (!pm_runtime_suspended(dev) && dev->bus && dev->bus->pm &&
523 dev->bus->pm->runtime_resume)
524 dev->bus->pm->runtime_resume(dev);
525
526 omap2430_low_level_init(musb);
527 omap2430_restore_context(musb);
528 otg_set_suspend(musb->xceiv, 0);
529
530 return 0;
531 }
532
533 static struct dev_pm_ops omap2430_pm_ops = {
534 .suspend = omap2430_suspend,
535 .resume = omap2430_resume,
536 };
537
538 #define DEV_PM_OPS (&omap2430_pm_ops)
539 #else
540 #define DEV_PM_OPS NULL
541 #endif
542
543 static struct platform_driver omap2430_driver = {
544 .remove = __exit_p(omap2430_remove),
545 .driver = {
546 .name = "musb-omap2430",
547 .pm = DEV_PM_OPS,
548 },
549 };
550
551 MODULE_DESCRIPTION("OMAP2PLUS MUSB Glue Layer");
552 MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>");
553 MODULE_LICENSE("GPL v2");
554
555 static int __init omap2430_init(void)
556 {
557 return platform_driver_probe(&omap2430_driver, omap2430_probe);
558 }
559 subsys_initcall(omap2430_init);
560
561 static void __exit omap2430_exit(void)
562 {
563 platform_driver_unregister(&omap2430_driver);
564 }
565 module_exit(omap2430_exit);
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