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[mirror_ubuntu-bionic-kernel.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
37 #include "musb_core.h"
38 #include "omap2430.h"
39
40 struct omap2430_glue {
41 struct device *dev;
42 struct platform_device *musb;
43 struct clk *clk;
44 };
45 #define glue_to_musb(g) platform_get_drvdata(g->musb)
46
47 static struct timer_list musb_idle_timer;
48
49 static void musb_do_idle(unsigned long _musb)
50 {
51 struct musb *musb = (void *)_musb;
52 unsigned long flags;
53 #ifdef CONFIG_USB_MUSB_HDRC_HCD
54 u8 power;
55 #endif
56 u8 devctl;
57
58 spin_lock_irqsave(&musb->lock, flags);
59
60 switch (musb->xceiv->state) {
61 case OTG_STATE_A_WAIT_BCON:
62
63 devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
64 if (devctl & MUSB_DEVCTL_BDEVICE) {
65 musb->xceiv->state = OTG_STATE_B_IDLE;
66 MUSB_DEV_MODE(musb);
67 } else {
68 musb->xceiv->state = OTG_STATE_A_IDLE;
69 MUSB_HST_MODE(musb);
70 }
71 break;
72 #ifdef CONFIG_USB_MUSB_HDRC_HCD
73 case OTG_STATE_A_SUSPEND:
74 /* finish RESUME signaling? */
75 if (musb->port1_status & MUSB_PORT_STAT_RESUME) {
76 power = musb_readb(musb->mregs, MUSB_POWER);
77 power &= ~MUSB_POWER_RESUME;
78 DBG(1, "root port resume stopped, power %02x\n", power);
79 musb_writeb(musb->mregs, MUSB_POWER, power);
80 musb->is_active = 1;
81 musb->port1_status &= ~(USB_PORT_STAT_SUSPEND
82 | MUSB_PORT_STAT_RESUME);
83 musb->port1_status |= USB_PORT_STAT_C_SUSPEND << 16;
84 usb_hcd_poll_rh_status(musb_to_hcd(musb));
85 /* NOTE: it might really be A_WAIT_BCON ... */
86 musb->xceiv->state = OTG_STATE_A_HOST;
87 }
88 break;
89 #endif
90 #ifdef CONFIG_USB_MUSB_HDRC_HCD
91 case OTG_STATE_A_HOST:
92 devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
93 if (devctl & MUSB_DEVCTL_BDEVICE)
94 musb->xceiv->state = OTG_STATE_B_IDLE;
95 else
96 musb->xceiv->state = OTG_STATE_A_WAIT_BCON;
97 #endif
98 default:
99 break;
100 }
101 spin_unlock_irqrestore(&musb->lock, flags);
102 }
103
104
105 static void omap2430_musb_try_idle(struct musb *musb, unsigned long timeout)
106 {
107 unsigned long default_timeout = jiffies + msecs_to_jiffies(3);
108 static unsigned long last_timer;
109
110 if (timeout == 0)
111 timeout = default_timeout;
112
113 /* Never idle if active, or when VBUS timeout is not set as host */
114 if (musb->is_active || ((musb->a_wait_bcon == 0)
115 && (musb->xceiv->state == OTG_STATE_A_WAIT_BCON))) {
116 DBG(4, "%s active, deleting timer\n", otg_state_string(musb));
117 del_timer(&musb_idle_timer);
118 last_timer = jiffies;
119 return;
120 }
121
122 if (time_after(last_timer, timeout)) {
123 if (!timer_pending(&musb_idle_timer))
124 last_timer = timeout;
125 else {
126 DBG(4, "Longer idle timer already pending, ignoring\n");
127 return;
128 }
129 }
130 last_timer = timeout;
131
132 DBG(4, "%s inactive, for idle timer for %lu ms\n",
133 otg_state_string(musb),
134 (unsigned long)jiffies_to_msecs(timeout - jiffies));
135 mod_timer(&musb_idle_timer, timeout);
136 }
137
138 static void omap2430_musb_set_vbus(struct musb *musb, int is_on)
139 {
140 u8 devctl;
141 unsigned long timeout = jiffies + msecs_to_jiffies(1000);
142 int ret = 1;
143 /* HDRC controls CPEN, but beware current surges during device
144 * connect. They can trigger transient overcurrent conditions
145 * that must be ignored.
146 */
147
148 devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
149
150 if (is_on) {
151 if (musb->xceiv->state == OTG_STATE_A_IDLE) {
152 /* start the session */
153 devctl |= MUSB_DEVCTL_SESSION;
154 musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
155 /*
156 * Wait for the musb to set as A device to enable the
157 * VBUS
158 */
159 while (musb_readb(musb->mregs, MUSB_DEVCTL) & 0x80) {
160
161 cpu_relax();
162
163 if (time_after(jiffies, timeout)) {
164 dev_err(musb->controller,
165 "configured as A device timeout");
166 ret = -EINVAL;
167 break;
168 }
169 }
170
171 if (ret && musb->xceiv->set_vbus)
172 otg_set_vbus(musb->xceiv, 1);
173 } else {
174 musb->is_active = 1;
175 musb->xceiv->default_a = 1;
176 musb->xceiv->state = OTG_STATE_A_WAIT_VRISE;
177 devctl |= MUSB_DEVCTL_SESSION;
178 MUSB_HST_MODE(musb);
179 }
180 } else {
181 musb->is_active = 0;
182
183 /* NOTE: we're skipping A_WAIT_VFALL -> A_IDLE and
184 * jumping right to B_IDLE...
185 */
186
187 musb->xceiv->default_a = 0;
188 musb->xceiv->state = OTG_STATE_B_IDLE;
189 devctl &= ~MUSB_DEVCTL_SESSION;
190
191 MUSB_DEV_MODE(musb);
192 }
193 musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
194
195 DBG(1, "VBUS %s, devctl %02x "
196 /* otg %3x conf %08x prcm %08x */ "\n",
197 otg_state_string(musb),
198 musb_readb(musb->mregs, MUSB_DEVCTL));
199 }
200
201 static int omap2430_musb_set_mode(struct musb *musb, u8 musb_mode)
202 {
203 u8 devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
204
205 devctl |= MUSB_DEVCTL_SESSION;
206 musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
207
208 return 0;
209 }
210
211 static inline void omap2430_low_level_exit(struct musb *musb)
212 {
213 u32 l;
214
215 /* in any role */
216 l = musb_readl(musb->mregs, OTG_FORCESTDBY);
217 l |= ENABLEFORCE; /* enable MSTANDBY */
218 musb_writel(musb->mregs, OTG_FORCESTDBY, l);
219
220 l = musb_readl(musb->mregs, OTG_SYSCONFIG);
221 l |= ENABLEWAKEUP; /* enable wakeup */
222 musb_writel(musb->mregs, OTG_SYSCONFIG, l);
223 }
224
225 static inline void omap2430_low_level_init(struct musb *musb)
226 {
227 u32 l;
228
229 l = musb_readl(musb->mregs, OTG_SYSCONFIG);
230 l &= ~ENABLEWAKEUP; /* disable wakeup */
231 musb_writel(musb->mregs, OTG_SYSCONFIG, l);
232
233 l = musb_readl(musb->mregs, OTG_FORCESTDBY);
234 l &= ~ENABLEFORCE; /* disable MSTANDBY */
235 musb_writel(musb->mregs, OTG_FORCESTDBY, l);
236 }
237
238 /* blocking notifier support */
239 static int musb_otg_notifications(struct notifier_block *nb,
240 unsigned long event, void *unused)
241 {
242 struct musb *musb = container_of(nb, struct musb, nb);
243 struct device *dev = musb->controller;
244 struct musb_hdrc_platform_data *pdata = dev->platform_data;
245 struct omap_musb_board_data *data = pdata->board_data;
246
247 switch (event) {
248 case USB_EVENT_ID:
249 DBG(4, "ID GND\n");
250
251 if (is_otg_enabled(musb)) {
252 #ifdef CONFIG_USB_GADGET_MUSB_HDRC
253 if (musb->gadget_driver) {
254 otg_init(musb->xceiv);
255
256 if (data->interface_type ==
257 MUSB_INTERFACE_UTMI)
258 omap2430_musb_set_vbus(musb, 1);
259
260 }
261 #endif
262 } else {
263 otg_init(musb->xceiv);
264 if (data->interface_type ==
265 MUSB_INTERFACE_UTMI)
266 omap2430_musb_set_vbus(musb, 1);
267 }
268 break;
269
270 case USB_EVENT_VBUS:
271 DBG(4, "VBUS Connect\n");
272
273 otg_init(musb->xceiv);
274 break;
275
276 case USB_EVENT_NONE:
277 DBG(4, "VBUS Disconnect\n");
278
279 if (data->interface_type == MUSB_INTERFACE_UTMI) {
280 if (musb->xceiv->set_vbus)
281 otg_set_vbus(musb->xceiv, 0);
282 }
283 otg_shutdown(musb->xceiv);
284 break;
285 default:
286 DBG(4, "ID float\n");
287 return NOTIFY_DONE;
288 }
289
290 return NOTIFY_OK;
291 }
292
293 static int omap2430_musb_init(struct musb *musb)
294 {
295 u32 l, status = 0;
296 struct device *dev = musb->controller;
297 struct musb_hdrc_platform_data *plat = dev->platform_data;
298 struct omap_musb_board_data *data = plat->board_data;
299
300 /* We require some kind of external transceiver, hooked
301 * up through ULPI. TWL4030-family PMICs include one,
302 * which needs a driver, drivers aren't always needed.
303 */
304 musb->xceiv = otg_get_transceiver();
305 if (!musb->xceiv) {
306 pr_err("HS USB OTG: no transceiver configured\n");
307 return -ENODEV;
308 }
309
310 omap2430_low_level_init(musb);
311
312 l = musb_readl(musb->mregs, OTG_SYSCONFIG);
313 l &= ~ENABLEWAKEUP; /* disable wakeup */
314 l &= ~NOSTDBY; /* remove possible nostdby */
315 l |= SMARTSTDBY; /* enable smart standby */
316 l &= ~AUTOIDLE; /* disable auto idle */
317 l &= ~NOIDLE; /* remove possible noidle */
318 l |= SMARTIDLE; /* enable smart idle */
319 /*
320 * MUSB AUTOIDLE don't work in 3430.
321 * Workaround by Richard Woodruff/TI
322 */
323 if (!cpu_is_omap3430())
324 l |= AUTOIDLE; /* enable auto idle */
325 musb_writel(musb->mregs, OTG_SYSCONFIG, l);
326
327 l = musb_readl(musb->mregs, OTG_INTERFSEL);
328
329 if (data->interface_type == MUSB_INTERFACE_UTMI) {
330 /* OMAP4 uses Internal PHY GS70 which uses UTMI interface */
331 l &= ~ULPI_12PIN; /* Disable ULPI */
332 l |= UTMI_8BIT; /* Enable UTMI */
333 } else {
334 l |= ULPI_12PIN;
335 }
336
337 musb_writel(musb->mregs, OTG_INTERFSEL, l);
338
339 pr_debug("HS USB OTG: revision 0x%x, sysconfig 0x%02x, "
340 "sysstatus 0x%x, intrfsel 0x%x, simenable 0x%x\n",
341 musb_readl(musb->mregs, OTG_REVISION),
342 musb_readl(musb->mregs, OTG_SYSCONFIG),
343 musb_readl(musb->mregs, OTG_SYSSTATUS),
344 musb_readl(musb->mregs, OTG_INTERFSEL),
345 musb_readl(musb->mregs, OTG_SIMENABLE));
346
347 musb->nb.notifier_call = musb_otg_notifications;
348 status = otg_register_notifier(musb->xceiv, &musb->nb);
349
350 if (status)
351 DBG(1, "notification register failed\n");
352
353 /* check whether cable is already connected */
354 if (musb->xceiv->state ==OTG_STATE_B_IDLE)
355 musb_otg_notifications(&musb->nb, 1,
356 musb->xceiv->gadget);
357
358 setup_timer(&musb_idle_timer, musb_do_idle, (unsigned long) musb);
359
360 return 0;
361 }
362
363 static int omap2430_musb_exit(struct musb *musb)
364 {
365
366 omap2430_low_level_exit(musb);
367 otg_put_transceiver(musb->xceiv);
368
369 return 0;
370 }
371
372 static const struct musb_platform_ops omap2430_ops = {
373 .init = omap2430_musb_init,
374 .exit = omap2430_musb_exit,
375
376 .set_mode = omap2430_musb_set_mode,
377 .try_idle = omap2430_musb_try_idle,
378
379 .set_vbus = omap2430_musb_set_vbus,
380 };
381
382 static u64 omap2430_dmamask = DMA_BIT_MASK(32);
383
384 static int __init omap2430_probe(struct platform_device *pdev)
385 {
386 struct musb_hdrc_platform_data *pdata = pdev->dev.platform_data;
387 struct platform_device *musb;
388 struct omap2430_glue *glue;
389 struct clk *clk;
390
391 int ret = -ENOMEM;
392
393 glue = kzalloc(sizeof(*glue), GFP_KERNEL);
394 if (!glue) {
395 dev_err(&pdev->dev, "failed to allocate glue context\n");
396 goto err0;
397 }
398
399 musb = platform_device_alloc("musb-hdrc", -1);
400 if (!musb) {
401 dev_err(&pdev->dev, "failed to allocate musb device\n");
402 goto err1;
403 }
404
405 clk = clk_get(&pdev->dev, "ick");
406 if (IS_ERR(clk)) {
407 dev_err(&pdev->dev, "failed to get clock\n");
408 ret = PTR_ERR(clk);
409 goto err2;
410 }
411
412 ret = clk_enable(clk);
413 if (ret) {
414 dev_err(&pdev->dev, "failed to enable clock\n");
415 goto err3;
416 }
417
418 musb->dev.parent = &pdev->dev;
419 musb->dev.dma_mask = &omap2430_dmamask;
420 musb->dev.coherent_dma_mask = omap2430_dmamask;
421
422 glue->dev = &pdev->dev;
423 glue->musb = musb;
424 glue->clk = clk;
425
426 pdata->platform_ops = &omap2430_ops;
427
428 platform_set_drvdata(pdev, glue);
429
430 ret = platform_device_add_resources(musb, pdev->resource,
431 pdev->num_resources);
432 if (ret) {
433 dev_err(&pdev->dev, "failed to add resources\n");
434 goto err4;
435 }
436
437 ret = platform_device_add_data(musb, pdata, sizeof(*pdata));
438 if (ret) {
439 dev_err(&pdev->dev, "failed to add platform_data\n");
440 goto err4;
441 }
442
443 ret = platform_device_add(musb);
444 if (ret) {
445 dev_err(&pdev->dev, "failed to register musb device\n");
446 goto err4;
447 }
448
449 return 0;
450
451 err4:
452 clk_disable(clk);
453
454 err3:
455 clk_put(clk);
456
457 err2:
458 platform_device_put(musb);
459
460 err1:
461 kfree(glue);
462
463 err0:
464 return ret;
465 }
466
467 static int __exit omap2430_remove(struct platform_device *pdev)
468 {
469 struct omap2430_glue *glue = platform_get_drvdata(pdev);
470
471 platform_device_del(glue->musb);
472 platform_device_put(glue->musb);
473 clk_disable(glue->clk);
474 clk_put(glue->clk);
475 kfree(glue);
476
477 return 0;
478 }
479
480 #ifdef CONFIG_PM
481 static void omap2430_save_context(struct musb *musb)
482 {
483 musb->context.otg_sysconfig = musb_readl(musb->mregs, OTG_SYSCONFIG);
484 musb->context.otg_forcestandby = musb_readl(musb->mregs, OTG_FORCESTDBY);
485 }
486
487 static void omap2430_restore_context(struct musb *musb)
488 {
489 musb_writel(musb->mregs, OTG_SYSCONFIG, musb->context.otg_sysconfig);
490 musb_writel(musb->mregs, OTG_FORCESTDBY, musb->context.otg_forcestandby);
491 }
492
493 static int omap2430_suspend(struct device *dev)
494 {
495 struct omap2430_glue *glue = dev_get_drvdata(dev);
496 struct musb *musb = glue_to_musb(glue);
497
498 omap2430_low_level_exit(musb);
499 otg_set_suspend(musb->xceiv, 1);
500 omap2430_save_context(musb);
501 clk_disable(glue->clk);
502
503 return 0;
504 }
505
506 static int omap2430_resume(struct device *dev)
507 {
508 struct omap2430_glue *glue = dev_get_drvdata(dev);
509 struct musb *musb = glue_to_musb(glue);
510 int ret;
511
512 ret = clk_enable(glue->clk);
513 if (ret) {
514 dev_err(dev, "faled to enable clock\n");
515 return ret;
516 }
517
518 omap2430_low_level_init(musb);
519 omap2430_restore_context(musb);
520 otg_set_suspend(musb->xceiv, 0);
521
522 return 0;
523 }
524
525 static struct dev_pm_ops omap2430_pm_ops = {
526 .suspend = omap2430_suspend,
527 .resume = omap2430_resume,
528 };
529
530 #define DEV_PM_OPS (&omap2430_pm_ops)
531 #else
532 #define DEV_PM_OPS NULL
533 #endif
534
535 static struct platform_driver omap2430_driver = {
536 .remove = __exit_p(omap2430_remove),
537 .driver = {
538 .name = "musb-omap2430",
539 .pm = DEV_PM_OPS,
540 },
541 };
542
543 MODULE_DESCRIPTION("OMAP2PLUS MUSB Glue Layer");
544 MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>");
545 MODULE_LICENSE("GPL v2");
546
547 static int __init omap2430_init(void)
548 {
549 return platform_driver_probe(&omap2430_driver, omap2430_probe);
550 }
551 subsys_initcall(omap2430_init);
552
553 static void __exit omap2430_exit(void)
554 {
555 platform_driver_unregister(&omap2430_driver);
556 }
557 module_exit(omap2430_exit);