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Add linux-next specific files for 20110421
[linux-2.6/next.git] / drivers / usb / musb / omap2430.c
blob57a27fa954b41fdd7b0fba880fd3c9da2b64b19c
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 pm_runtime_get_sync(musb->controller);
248 otg_init(musb->xceiv);
249 omap2430_musb_set_vbus(musb, 1);
250 }
251 #endif
252 } else {
253 pm_runtime_get_sync(musb->controller);
254 otg_init(musb->xceiv);
255 omap2430_musb_set_vbus(musb, 1);
256 }
257 break;
258
259 case USB_EVENT_VBUS:
260 DBG(4, "VBUS Connect\n");
261
262 #ifdef CONFIG_USB_GADGET_MUSB_HDRC
263 if (musb->gadget_driver)
264 pm_runtime_get_sync(musb->controller);
265 #endif
266 otg_init(musb->xceiv);
267 break;
268
269 case USB_EVENT_NONE:
270 DBG(4, "VBUS Disconnect\n");
271
272 #ifdef CONFIG_USB_GADGET_MUSB_HDRC
273 if (is_otg_enabled(musb))
274 if (musb->gadget_driver)
275 #endif
276 {
277 pm_runtime_mark_last_busy(musb->controller);
278 pm_runtime_put_autosuspend(musb->controller);
279 }
280
281 if (data->interface_type == MUSB_INTERFACE_UTMI) {
282 if (musb->xceiv->set_vbus)
283 otg_set_vbus(musb->xceiv, 0);
284 }
285 otg_shutdown(musb->xceiv);
286 break;
287 default:
288 DBG(4, "ID float\n");
289 return NOTIFY_DONE;
290 }
291
292 return NOTIFY_OK;
293 }
294
295 static int omap2430_musb_init(struct musb *musb)
296 {
297 u32 l, status = 0;
298 struct device *dev = musb->controller;
299 struct musb_hdrc_platform_data *plat = dev->platform_data;
300 struct omap_musb_board_data *data = plat->board_data;
301
302 /* We require some kind of external transceiver, hooked
303 * up through ULPI. TWL4030-family PMICs include one,
304 * which needs a driver, drivers aren't always needed.
305 */
306 musb->xceiv = otg_get_transceiver();
307 if (!musb->xceiv) {
308 pr_err("HS USB OTG: no transceiver configured\n");
309 return -ENODEV;
310 }
311
312 status = pm_runtime_get_sync(dev);
313 if (status < 0) {
314 dev_err(dev, "pm_runtime_get_sync FAILED");
315 goto err1;
316 }
317
318 l = musb_readl(musb->mregs, OTG_INTERFSEL);
319
320 if (data->interface_type == MUSB_INTERFACE_UTMI) {
321 /* OMAP4 uses Internal PHY GS70 which uses UTMI interface */
322 l &= ~ULPI_12PIN; /* Disable ULPI */
323 l |= UTMI_8BIT; /* Enable UTMI */
324 } else {
325 l |= ULPI_12PIN;
326 }
327
328 musb_writel(musb->mregs, OTG_INTERFSEL, l);
329
330 pr_debug("HS USB OTG: revision 0x%x, sysconfig 0x%02x, "
331 "sysstatus 0x%x, intrfsel 0x%x, simenable 0x%x\n",
332 musb_readl(musb->mregs, OTG_REVISION),
333 musb_readl(musb->mregs, OTG_SYSCONFIG),
334 musb_readl(musb->mregs, OTG_SYSSTATUS),
335 musb_readl(musb->mregs, OTG_INTERFSEL),
336 musb_readl(musb->mregs, OTG_SIMENABLE));
337
338 musb->nb.notifier_call = musb_otg_notifications;
339 status = otg_register_notifier(musb->xceiv, &musb->nb);
340
341 if (status)
342 DBG(1, "notification register failed\n");
343
344 setup_timer(&musb_idle_timer, musb_do_idle, (unsigned long) musb);
345
346 return 0;
347
348 err1:
349 pm_runtime_disable(dev);
350 return status;
351 }
352
353 static void omap2430_musb_enable(struct musb *musb)
354 {
355 u8 devctl;
356 unsigned long timeout = jiffies + msecs_to_jiffies(1000);
357 struct device *dev = musb->controller;
358 struct musb_hdrc_platform_data *pdata = dev->platform_data;
359 struct omap_musb_board_data *data = pdata->board_data;
360
361 switch (musb->xceiv->last_event) {
362
363 case USB_EVENT_ID:
364 otg_init(musb->xceiv);
365 if (data->interface_type == MUSB_INTERFACE_UTMI) {
366 devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
367 /* start the session */
368 devctl |= MUSB_DEVCTL_SESSION;
369 musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
370 while (musb_readb(musb->mregs, MUSB_DEVCTL) &
371 MUSB_DEVCTL_BDEVICE) {
372 cpu_relax();
373
374 if (time_after(jiffies, timeout)) {
375 dev_err(musb->controller,
376 "configured as A device timeout");
377 break;
378 }
379 }
380 }
381 break;
382
383 case USB_EVENT_VBUS:
384 otg_init(musb->xceiv);
385 break;
386
387 default:
388 break;
389 }
390 }
391
392 static void omap2430_musb_disable(struct musb *musb)
393 {
394 if (musb->xceiv->last_event)
395 otg_shutdown(musb->xceiv);
396 }
397
398 static int omap2430_musb_exit(struct musb *musb)
399 {
400 del_timer_sync(&musb_idle_timer);
401
402 omap2430_low_level_exit(musb);
403 otg_put_transceiver(musb->xceiv);
404
405 return 0;
406 }
407
408 static const struct musb_platform_ops omap2430_ops = {
409 .init = omap2430_musb_init,
410 .exit = omap2430_musb_exit,
411
412 .set_mode = omap2430_musb_set_mode,
413 .try_idle = omap2430_musb_try_idle,
414
415 .set_vbus = omap2430_musb_set_vbus,
416
417 .enable = omap2430_musb_enable,
418 .disable = omap2430_musb_disable,
419 };
420
421 static u64 omap2430_dmamask = DMA_BIT_MASK(32);
422
423 static int __init omap2430_probe(struct platform_device *pdev)
424 {
425 struct musb_hdrc_platform_data *pdata = pdev->dev.platform_data;
426 struct platform_device *musb;
427 struct omap2430_glue *glue;
428 int ret = -ENOMEM;
429
430 glue = kzalloc(sizeof(*glue), GFP_KERNEL);
431 if (!glue) {
432 dev_err(&pdev->dev, "failed to allocate glue context\n");
433 goto err0;
434 }
435
436 musb = platform_device_alloc("musb-hdrc", -1);
437 if (!musb) {
438 dev_err(&pdev->dev, "failed to allocate musb device\n");
439 goto err1;
440 }
441
442 musb->dev.parent = &pdev->dev;
443 musb->dev.dma_mask = &omap2430_dmamask;
444 musb->dev.coherent_dma_mask = omap2430_dmamask;
445
446 glue->dev = &pdev->dev;
447 glue->musb = musb;
448
449 pdata->platform_ops = &omap2430_ops;
450
451 platform_set_drvdata(pdev, glue);
452
453 ret = platform_device_add_resources(musb, pdev->resource,
454 pdev->num_resources);
455 if (ret) {
456 dev_err(&pdev->dev, "failed to add resources\n");
457 goto err2;
458 }
459
460 ret = platform_device_add_data(musb, pdata, sizeof(*pdata));
461 if (ret) {
462 dev_err(&pdev->dev, "failed to add platform_data\n");
463 goto err2;
464 }
465
466 ret = platform_device_add(musb);
467 if (ret) {
468 dev_err(&pdev->dev, "failed to register musb device\n");
469 goto err2;
470 }
471
472 pm_runtime_enable(&pdev->dev);
473
474 return 0;
475
476 err2:
477 platform_device_put(musb);
478
479 err1:
480 kfree(glue);
481
482 err0:
483 return ret;
484 }
485
486 static int __exit omap2430_remove(struct platform_device *pdev)
487 {
488 struct omap2430_glue *glue = platform_get_drvdata(pdev);
489
490 platform_device_del(glue->musb);
491 platform_device_put(glue->musb);
492 pm_runtime_put(&pdev->dev);
493 pm_runtime_disable(&pdev->dev);
494 kfree(glue);
495
496 return 0;
497 }
498
499 #ifdef CONFIG_PM
500
501 static int omap2430_runtime_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
509 return 0;
510 }
511
512 static int omap2430_runtime_resume(struct device *dev)
513 {
514 struct omap2430_glue *glue = dev_get_drvdata(dev);
515 struct musb *musb = glue_to_musb(glue);
516
517 omap2430_low_level_init(musb);
518 otg_set_suspend(musb->xceiv, 0);
519
520 return 0;
521 }
522
523 static struct dev_pm_ops omap2430_pm_ops = {
524 .runtime_suspend = omap2430_runtime_suspend,
525 .runtime_resume = omap2430_runtime_resume,
526 };
527
528 #define DEV_PM_OPS (&omap2430_pm_ops)
529 #else
530 #define DEV_PM_OPS NULL
531 #endif
532
533 static struct platform_driver omap2430_driver = {
534 .remove = __exit_p(omap2430_remove),
535 .driver = {
536 .name = "musb-omap2430",
537 .pm = DEV_PM_OPS,
538 },
539 };
540
541 MODULE_DESCRIPTION("OMAP2PLUS MUSB Glue Layer");
542 MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>");
543 MODULE_LICENSE("GPL v2");
544
545 static int __init omap2430_init(void)
546 {
547 return platform_driver_probe(&omap2430_driver, omap2430_probe);
548 }
549 subsys_initcall(omap2430_init);
550
551 static void __exit omap2430_exit(void)
552 {
553 platform_driver_unregister(&omap2430_driver);
554 }
555 module_exit(omap2430_exit);
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