Merge remote-tracking branch 'jk/vfs' into work.misc
[cascardo/linux.git] / drivers / usb / musb / musb_virthub.c
1 /*
2  * MUSB OTG driver virtual root hub support
3  *
4  * Copyright 2005 Mentor Graphics Corporation
5  * Copyright (C) 2005-2006 by Texas Instruments
6  * Copyright (C) 2006-2007 Nokia Corporation
7  *
8  * This program is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU General Public License
10  * version 2 as published by the Free Software Foundation.
11  *
12  * This program is distributed in the hope that it will be useful, but
13  * WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15  * General Public License for more details.
16  *
17  * You should have received a copy of the GNU General Public License
18  * along with this program; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20  * 02110-1301 USA
21  *
22  * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
23  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
24  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
25  * NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
27  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
28  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
29  * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
31  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32  *
33  */
34
35 #include <linux/module.h>
36 #include <linux/kernel.h>
37 #include <linux/sched.h>
38 #include <linux/errno.h>
39 #include <linux/time.h>
40 #include <linux/timer.h>
41
42 #include <asm/unaligned.h>
43
44 #include "musb_core.h"
45
46 void musb_host_finish_resume(struct work_struct *work)
47 {
48         struct musb *musb;
49         unsigned long flags;
50         u8 power;
51
52         musb = container_of(work, struct musb, finish_resume_work.work);
53
54         spin_lock_irqsave(&musb->lock, flags);
55
56         power = musb_readb(musb->mregs, MUSB_POWER);
57         power &= ~MUSB_POWER_RESUME;
58         musb_dbg(musb, "root port resume stopped, power %02x", power);
59         musb_writeb(musb->mregs, MUSB_POWER, power);
60
61         /*
62          * ISSUE:  DaVinci (RTL 1.300) disconnects after
63          * resume of high speed peripherals (but not full
64          * speed ones).
65          */
66         musb->is_active = 1;
67         musb->port1_status &= ~(USB_PORT_STAT_SUSPEND | MUSB_PORT_STAT_RESUME);
68         musb->port1_status |= USB_PORT_STAT_C_SUSPEND << 16;
69         usb_hcd_poll_rh_status(musb->hcd);
70         /* NOTE: it might really be A_WAIT_BCON ... */
71         musb->xceiv->otg->state = OTG_STATE_A_HOST;
72
73         spin_unlock_irqrestore(&musb->lock, flags);
74 }
75
76 void musb_port_suspend(struct musb *musb, bool do_suspend)
77 {
78         struct usb_otg  *otg = musb->xceiv->otg;
79         u8              power;
80         void __iomem    *mbase = musb->mregs;
81
82         if (!is_host_active(musb))
83                 return;
84
85         /* NOTE:  this doesn't necessarily put PHY into low power mode,
86          * turning off its clock; that's a function of PHY integration and
87          * MUSB_POWER_ENSUSPEND.  PHY may need a clock (sigh) to detect
88          * SE0 changing to connect (J) or wakeup (K) states.
89          */
90         power = musb_readb(mbase, MUSB_POWER);
91         if (do_suspend) {
92                 int retries = 10000;
93
94                 power &= ~MUSB_POWER_RESUME;
95                 power |= MUSB_POWER_SUSPENDM;
96                 musb_writeb(mbase, MUSB_POWER, power);
97
98                 /* Needed for OPT A tests */
99                 power = musb_readb(mbase, MUSB_POWER);
100                 while (power & MUSB_POWER_SUSPENDM) {
101                         power = musb_readb(mbase, MUSB_POWER);
102                         if (retries-- < 1)
103                                 break;
104                 }
105
106                 musb_dbg(musb, "Root port suspended, power %02x", power);
107
108                 musb->port1_status |= USB_PORT_STAT_SUSPEND;
109                 switch (musb->xceiv->otg->state) {
110                 case OTG_STATE_A_HOST:
111                         musb->xceiv->otg->state = OTG_STATE_A_SUSPEND;
112                         musb->is_active = otg->host->b_hnp_enable;
113                         if (musb->is_active)
114                                 mod_timer(&musb->otg_timer, jiffies
115                                         + msecs_to_jiffies(
116                                                 OTG_TIME_A_AIDL_BDIS));
117                         musb_platform_try_idle(musb, 0);
118                         break;
119                 case OTG_STATE_B_HOST:
120                         musb->xceiv->otg->state = OTG_STATE_B_WAIT_ACON;
121                         musb->is_active = otg->host->b_hnp_enable;
122                         musb_platform_try_idle(musb, 0);
123                         break;
124                 default:
125                         musb_dbg(musb, "bogus rh suspend? %s",
126                                 usb_otg_state_string(musb->xceiv->otg->state));
127                 }
128         } else if (power & MUSB_POWER_SUSPENDM) {
129                 power &= ~MUSB_POWER_SUSPENDM;
130                 power |= MUSB_POWER_RESUME;
131                 musb_writeb(mbase, MUSB_POWER, power);
132
133                 musb_dbg(musb, "Root port resuming, power %02x", power);
134
135                 /* later, GetPortStatus will stop RESUME signaling */
136                 musb->port1_status |= MUSB_PORT_STAT_RESUME;
137                 schedule_delayed_work(&musb->finish_resume_work,
138                                       msecs_to_jiffies(USB_RESUME_TIMEOUT));
139         }
140 }
141
142 void musb_port_reset(struct musb *musb, bool do_reset)
143 {
144         u8              power;
145         void __iomem    *mbase = musb->mregs;
146
147         if (musb->xceiv->otg->state == OTG_STATE_B_IDLE) {
148                 musb_dbg(musb, "HNP: Returning from HNP; no hub reset from b_idle");
149                 musb->port1_status &= ~USB_PORT_STAT_RESET;
150                 return;
151         }
152
153         if (!is_host_active(musb))
154                 return;
155
156         /* NOTE:  caller guarantees it will turn off the reset when
157          * the appropriate amount of time has passed
158          */
159         power = musb_readb(mbase, MUSB_POWER);
160         if (do_reset) {
161                 /*
162                  * If RESUME is set, we must make sure it stays minimum 20 ms.
163                  * Then we must clear RESUME and wait a bit to let musb start
164                  * generating SOFs. If we don't do this, OPT HS A 6.8 tests
165                  * fail with "Error! Did not receive an SOF before suspend
166                  * detected".
167                  */
168                 if (power &  MUSB_POWER_RESUME) {
169                         long remain = (unsigned long) musb->rh_timer - jiffies;
170
171                         if (musb->rh_timer > 0 && remain > 0) {
172                                 /* take into account the minimum delay after resume */
173                                 schedule_delayed_work(
174                                         &musb->deassert_reset_work, remain);
175                                 return;
176                         }
177
178                         musb_writeb(mbase, MUSB_POWER,
179                                     power & ~MUSB_POWER_RESUME);
180
181                         /* Give the core 1 ms to clear MUSB_POWER_RESUME */
182                         schedule_delayed_work(&musb->deassert_reset_work,
183                                               msecs_to_jiffies(1));
184                         return;
185                 }
186
187                 power &= 0xf0;
188                 musb_writeb(mbase, MUSB_POWER,
189                                 power | MUSB_POWER_RESET);
190
191                 musb->port1_status |= USB_PORT_STAT_RESET;
192                 musb->port1_status &= ~USB_PORT_STAT_ENABLE;
193                 schedule_delayed_work(&musb->deassert_reset_work,
194                                       msecs_to_jiffies(50));
195         } else {
196                 musb_dbg(musb, "root port reset stopped");
197                 musb_platform_pre_root_reset_end(musb);
198                 musb_writeb(mbase, MUSB_POWER,
199                                 power & ~MUSB_POWER_RESET);
200                 musb_platform_post_root_reset_end(musb);
201
202                 power = musb_readb(mbase, MUSB_POWER);
203                 if (power & MUSB_POWER_HSMODE) {
204                         musb_dbg(musb, "high-speed device connected");
205                         musb->port1_status |= USB_PORT_STAT_HIGH_SPEED;
206                 }
207
208                 musb->port1_status &= ~USB_PORT_STAT_RESET;
209                 musb->port1_status |= USB_PORT_STAT_ENABLE
210                                         | (USB_PORT_STAT_C_RESET << 16)
211                                         | (USB_PORT_STAT_C_ENABLE << 16);
212                 usb_hcd_poll_rh_status(musb->hcd);
213
214                 musb->vbuserr_retry = VBUSERR_RETRY_COUNT;
215         }
216 }
217
218 void musb_root_disconnect(struct musb *musb)
219 {
220         struct usb_otg  *otg = musb->xceiv->otg;
221
222         musb->port1_status = USB_PORT_STAT_POWER
223                         | (USB_PORT_STAT_C_CONNECTION << 16);
224
225         usb_hcd_poll_rh_status(musb->hcd);
226         musb->is_active = 0;
227
228         switch (musb->xceiv->otg->state) {
229         case OTG_STATE_A_SUSPEND:
230                 if (otg->host->b_hnp_enable) {
231                         musb->xceiv->otg->state = OTG_STATE_A_PERIPHERAL;
232                         musb->g.is_a_peripheral = 1;
233                         break;
234                 }
235                 /* FALLTHROUGH */
236         case OTG_STATE_A_HOST:
237                 musb->xceiv->otg->state = OTG_STATE_A_WAIT_BCON;
238                 musb->is_active = 0;
239                 break;
240         case OTG_STATE_A_WAIT_VFALL:
241                 musb->xceiv->otg->state = OTG_STATE_B_IDLE;
242                 break;
243         default:
244                 musb_dbg(musb, "host disconnect (%s)",
245                         usb_otg_state_string(musb->xceiv->otg->state));
246         }
247 }
248
249
250 /*---------------------------------------------------------------------*/
251
252 /* Caller may or may not hold musb->lock */
253 int musb_hub_status_data(struct usb_hcd *hcd, char *buf)
254 {
255         struct musb     *musb = hcd_to_musb(hcd);
256         int             retval = 0;
257
258         /* called in_irq() via usb_hcd_poll_rh_status() */
259         if (musb->port1_status & 0xffff0000) {
260                 *buf = 0x02;
261                 retval = 1;
262         }
263         return retval;
264 }
265
266 static int musb_has_gadget(struct musb *musb)
267 {
268         /*
269          * In host-only mode we start a connection right away. In OTG mode
270          * we have to wait until we loaded a gadget. We don't really need a
271          * gadget if we operate as a host but we should not start a session
272          * as a device without a gadget or else we explode.
273          */
274 #ifdef CONFIG_USB_MUSB_HOST
275         return 1;
276 #else
277         return musb->port_mode == MUSB_PORT_MODE_HOST;
278 #endif
279 }
280
281 int musb_hub_control(
282         struct usb_hcd  *hcd,
283         u16             typeReq,
284         u16             wValue,
285         u16             wIndex,
286         char            *buf,
287         u16             wLength)
288 {
289         struct musb     *musb = hcd_to_musb(hcd);
290         u32             temp;
291         int             retval = 0;
292         unsigned long   flags;
293         bool            start_musb = false;
294
295         spin_lock_irqsave(&musb->lock, flags);
296
297         if (unlikely(!HCD_HW_ACCESSIBLE(hcd))) {
298                 spin_unlock_irqrestore(&musb->lock, flags);
299                 return -ESHUTDOWN;
300         }
301
302         /* hub features:  always zero, setting is a NOP
303          * port features: reported, sometimes updated when host is active
304          * no indicators
305          */
306         switch (typeReq) {
307         case ClearHubFeature:
308         case SetHubFeature:
309                 switch (wValue) {
310                 case C_HUB_OVER_CURRENT:
311                 case C_HUB_LOCAL_POWER:
312                         break;
313                 default:
314                         goto error;
315                 }
316                 break;
317         case ClearPortFeature:
318                 if ((wIndex & 0xff) != 1)
319                         goto error;
320
321                 switch (wValue) {
322                 case USB_PORT_FEAT_ENABLE:
323                         break;
324                 case USB_PORT_FEAT_SUSPEND:
325                         musb_port_suspend(musb, false);
326                         break;
327                 case USB_PORT_FEAT_POWER:
328                         if (!hcd->self.is_b_host)
329                                 musb_platform_set_vbus(musb, 0);
330                         break;
331                 case USB_PORT_FEAT_C_CONNECTION:
332                 case USB_PORT_FEAT_C_ENABLE:
333                 case USB_PORT_FEAT_C_OVER_CURRENT:
334                 case USB_PORT_FEAT_C_RESET:
335                 case USB_PORT_FEAT_C_SUSPEND:
336                         break;
337                 default:
338                         goto error;
339                 }
340                 musb_dbg(musb, "clear feature %d", wValue);
341                 musb->port1_status &= ~(1 << wValue);
342                 break;
343         case GetHubDescriptor:
344                 {
345                 struct usb_hub_descriptor *desc = (void *)buf;
346
347                 desc->bDescLength = 9;
348                 desc->bDescriptorType = USB_DT_HUB;
349                 desc->bNbrPorts = 1;
350                 desc->wHubCharacteristics = cpu_to_le16(
351                         HUB_CHAR_INDV_PORT_LPSM /* per-port power switching */
352                         | HUB_CHAR_NO_OCPM      /* no overcurrent reporting */
353                         );
354                 desc->bPwrOn2PwrGood = 5;       /* msec/2 */
355                 desc->bHubContrCurrent = 0;
356
357                 /* workaround bogus struct definition */
358                 desc->u.hs.DeviceRemovable[0] = 0x02;   /* port 1 */
359                 desc->u.hs.DeviceRemovable[1] = 0xff;
360                 }
361                 break;
362         case GetHubStatus:
363                 temp = 0;
364                 *(__le32 *) buf = cpu_to_le32(temp);
365                 break;
366         case GetPortStatus:
367                 if (wIndex != 1)
368                         goto error;
369
370                 put_unaligned(cpu_to_le32(musb->port1_status
371                                         & ~MUSB_PORT_STAT_RESUME),
372                                 (__le32 *) buf);
373
374                 /* port change status is more interesting */
375                 musb_dbg(musb, "port status %08x", musb->port1_status);
376                 break;
377         case SetPortFeature:
378                 if ((wIndex & 0xff) != 1)
379                         goto error;
380
381                 switch (wValue) {
382                 case USB_PORT_FEAT_POWER:
383                         /* NOTE: this controller has a strange state machine
384                          * that involves "requesting sessions" according to
385                          * magic side effects from incompletely-described
386                          * rules about startup...
387                          *
388                          * This call is what really starts the host mode; be
389                          * very careful about side effects if you reorder any
390                          * initialization logic, e.g. for OTG, or change any
391                          * logic relating to VBUS power-up.
392                          */
393                         if (!hcd->self.is_b_host && musb_has_gadget(musb))
394                                 start_musb = true;
395                         break;
396                 case USB_PORT_FEAT_RESET:
397                         musb_port_reset(musb, true);
398                         break;
399                 case USB_PORT_FEAT_SUSPEND:
400                         musb_port_suspend(musb, true);
401                         break;
402                 case USB_PORT_FEAT_TEST:
403                         if (unlikely(is_host_active(musb)))
404                                 goto error;
405
406                         wIndex >>= 8;
407                         switch (wIndex) {
408                         case 1:
409                                 pr_debug("TEST_J\n");
410                                 temp = MUSB_TEST_J;
411                                 break;
412                         case 2:
413                                 pr_debug("TEST_K\n");
414                                 temp = MUSB_TEST_K;
415                                 break;
416                         case 3:
417                                 pr_debug("TEST_SE0_NAK\n");
418                                 temp = MUSB_TEST_SE0_NAK;
419                                 break;
420                         case 4:
421                                 pr_debug("TEST_PACKET\n");
422                                 temp = MUSB_TEST_PACKET;
423                                 musb_load_testpacket(musb);
424                                 break;
425                         case 5:
426                                 pr_debug("TEST_FORCE_ENABLE\n");
427                                 temp = MUSB_TEST_FORCE_HOST
428                                         | MUSB_TEST_FORCE_HS;
429
430                                 musb_writeb(musb->mregs, MUSB_DEVCTL,
431                                                 MUSB_DEVCTL_SESSION);
432                                 break;
433                         case 6:
434                                 pr_debug("TEST_FIFO_ACCESS\n");
435                                 temp = MUSB_TEST_FIFO_ACCESS;
436                                 break;
437                         default:
438                                 goto error;
439                         }
440                         musb_writeb(musb->mregs, MUSB_TESTMODE, temp);
441                         break;
442                 default:
443                         goto error;
444                 }
445                 musb_dbg(musb, "set feature %d", wValue);
446                 musb->port1_status |= 1 << wValue;
447                 break;
448
449         default:
450 error:
451                 /* "protocol stall" on error */
452                 retval = -EPIPE;
453         }
454         spin_unlock_irqrestore(&musb->lock, flags);
455
456         if (start_musb)
457                 musb_start(musb);
458
459         return retval;
460 }