linux 2.6.16.38 w/ vs2.0.3-rc1
[linux-2.6.git] / drivers / usb / host / ehci-hub.c
1 /*
2  * Copyright (C) 2001-2004 by David Brownell
3  * 
4  * This program is free software; you can redistribute it and/or modify it
5  * under the terms of the GNU General Public License as published by the
6  * Free Software Foundation; either version 2 of the License, or (at your
7  * option) any later version.
8  *
9  * This program is distributed in the hope that it will be useful, but
10  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
11  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12  * for more details.
13  *
14  * You should have received a copy of the GNU General Public License
15  * along with this program; if not, write to the Free Software Foundation,
16  * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
17  */
18
19 /* this file is part of ehci-hcd.c */
20
21 /*-------------------------------------------------------------------------*/
22
23 /*
24  * EHCI Root Hub ... the nonsharable stuff
25  *
26  * Registers don't need cpu_to_le32, that happens transparently
27  */
28
29 /*-------------------------------------------------------------------------*/
30
31 #ifdef  CONFIG_PM
32
33 static int ehci_bus_suspend (struct usb_hcd *hcd)
34 {
35         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
36         int                     port;
37
38         if (time_before (jiffies, ehci->next_statechange))
39                 msleep(5);
40
41         port = HCS_N_PORTS (ehci->hcs_params);
42         spin_lock_irq (&ehci->lock);
43
44         /* stop schedules, clean any completed work */
45         if (HC_IS_RUNNING(hcd->state)) {
46                 ehci_quiesce (ehci);
47                 hcd->state = HC_STATE_QUIESCING;
48         }
49         ehci->command = readl (&ehci->regs->command);
50         if (ehci->reclaim)
51                 ehci->reclaim_ready = 1;
52         ehci_work(ehci, NULL);
53
54         /* suspend any active/unsuspended ports, maybe allow wakeup */
55         while (port--) {
56                 u32 __iomem     *reg = &ehci->regs->port_status [port];
57                 u32             t1 = readl (reg) & ~PORT_RWC_BITS;
58                 u32             t2 = t1;
59
60                 if ((t1 & PORT_PE) && !(t1 & PORT_OWNER))
61                         t2 |= PORT_SUSPEND;
62                 if (device_may_wakeup(&hcd->self.root_hub->dev))
63                         t2 |= PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E;
64                 else
65                         t2 &= ~(PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E);
66
67                 if (t1 != t2) {
68                         ehci_vdbg (ehci, "port %d, %08x -> %08x\n",
69                                 port + 1, t1, t2);
70                         writel (t2, reg);
71                 }
72         }
73
74         /* turn off now-idle HC */
75         del_timer_sync (&ehci->watchdog);
76         ehci_halt (ehci);
77         hcd->state = HC_STATE_SUSPENDED;
78
79         ehci->next_statechange = jiffies + msecs_to_jiffies(10);
80         spin_unlock_irq (&ehci->lock);
81         return 0;
82 }
83
84
85 /* caller has locked the root hub, and should reset/reinit on error */
86 static int ehci_bus_resume (struct usb_hcd *hcd)
87 {
88         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
89         u32                     temp;
90         int                     i;
91         int                     intr_enable;
92
93         if (time_before (jiffies, ehci->next_statechange))
94                 msleep(5);
95         spin_lock_irq (&ehci->lock);
96
97         /* Ideally and we've got a real resume here, and no port's power
98          * was lost.  (For PCI, that means Vaux was maintained.)  But we
99          * could instead be restoring a swsusp snapshot -- so that BIOS was
100          * the last user of the controller, not reset/pm hardware keeping
101          * state we gave to it.
102          */
103
104         /* re-init operational registers in case we lost power */
105         if (readl (&ehci->regs->intr_enable) == 0) {
106                 /* at least some APM implementations will try to deliver
107                  * IRQs right away, so delay them until we're ready.
108                  */
109                 intr_enable = 1;
110                 writel (0, &ehci->regs->segment);
111                 writel (ehci->periodic_dma, &ehci->regs->frame_list);
112                 writel ((u32)ehci->async->qh_dma, &ehci->regs->async_next);
113         } else
114                 intr_enable = 0;
115         ehci_dbg(ehci, "resume root hub%s\n",
116                         intr_enable ? " after power loss" : "");
117
118         /* restore CMD_RUN, framelist size, and irq threshold */
119         writel (ehci->command, &ehci->regs->command);
120
121         /* take ports out of suspend */
122         i = HCS_N_PORTS (ehci->hcs_params);
123         while (i--) {
124                 temp = readl (&ehci->regs->port_status [i]);
125                 temp &= ~(PORT_RWC_BITS
126                         | PORT_WKOC_E | PORT_WKDISC_E | PORT_WKCONN_E);
127                 if (temp & PORT_SUSPEND) {
128                         ehci->reset_done [i] = jiffies + msecs_to_jiffies (20);
129                         temp |= PORT_RESUME;
130                 }
131                 writel (temp, &ehci->regs->port_status [i]);
132         }
133         i = HCS_N_PORTS (ehci->hcs_params);
134         mdelay (20);
135         while (i--) {
136                 temp = readl (&ehci->regs->port_status [i]);
137                 if ((temp & PORT_SUSPEND) == 0)
138                         continue;
139                 temp &= ~(PORT_RWC_BITS | PORT_RESUME);
140                 writel (temp, &ehci->regs->port_status [i]);
141                 ehci_vdbg (ehci, "resumed port %d\n", i + 1);
142         }
143         (void) readl (&ehci->regs->command);
144
145         /* maybe re-activate the schedule(s) */
146         temp = 0;
147         if (ehci->async->qh_next.qh)
148                 temp |= CMD_ASE;
149         if (ehci->periodic_sched)
150                 temp |= CMD_PSE;
151         if (temp) {
152                 ehci->command |= temp;
153                 writel (ehci->command, &ehci->regs->command);
154         }
155
156         ehci->next_statechange = jiffies + msecs_to_jiffies(5);
157         hcd->state = HC_STATE_RUNNING;
158
159         /* Now we can safely re-enable irqs */
160         if (intr_enable)
161                 writel (INTR_MASK, &ehci->regs->intr_enable);
162
163         spin_unlock_irq (&ehci->lock);
164         return 0;
165 }
166
167 #else
168
169 #define ehci_bus_suspend        NULL
170 #define ehci_bus_resume         NULL
171
172 #endif  /* CONFIG_PM */
173
174 /*-------------------------------------------------------------------------*/
175
176 static int check_reset_complete (
177         struct ehci_hcd *ehci,
178         int             index,
179         int             port_status
180 ) {
181         if (!(port_status & PORT_CONNECT)) {
182                 ehci->reset_done [index] = 0;
183                 return port_status;
184         }
185
186         /* if reset finished and it's still not enabled -- handoff */
187         if (!(port_status & PORT_PE)) {
188
189                 /* with integrated TT, there's nobody to hand it to! */
190                 if (ehci_is_TDI(ehci)) {
191                         ehci_dbg (ehci,
192                                 "Failed to enable port %d on root hub TT\n",
193                                 index+1);
194                         return port_status;
195                 }
196
197                 ehci_dbg (ehci, "port %d full speed --> companion\n",
198                         index + 1);
199
200                 // what happens if HCS_N_CC(params) == 0 ?
201                 port_status |= PORT_OWNER;
202                 port_status &= ~PORT_RWC_BITS;
203                 writel (port_status, &ehci->regs->port_status [index]);
204
205         } else
206                 ehci_dbg (ehci, "port %d high speed\n", index + 1);
207
208         return port_status;
209 }
210
211 /*-------------------------------------------------------------------------*/
212
213
214 /* build "status change" packet (one or two bytes) from HC registers */
215
216 static int
217 ehci_hub_status_data (struct usb_hcd *hcd, char *buf)
218 {
219         struct ehci_hcd *ehci = hcd_to_ehci (hcd);
220         u32             temp, status = 0;
221         int             ports, i, retval = 1;
222         unsigned long   flags;
223
224         /* if !USB_SUSPEND, root hub timers won't get shut down ... */
225         if (!HC_IS_RUNNING(hcd->state))
226                 return 0;
227
228         /* init status to no-changes */
229         buf [0] = 0;
230         ports = HCS_N_PORTS (ehci->hcs_params);
231         if (ports > 7) {
232                 buf [1] = 0;
233                 retval++;
234         }
235         
236         /* no hub change reports (bit 0) for now (power, ...) */
237
238         /* port N changes (bit N)? */
239         spin_lock_irqsave (&ehci->lock, flags);
240         for (i = 0; i < ports; i++) {
241                 temp = readl (&ehci->regs->port_status [i]);
242                 if (temp & PORT_OWNER) {
243                         /* don't report this in GetPortStatus */
244                         if (temp & PORT_CSC) {
245                                 temp &= ~PORT_RWC_BITS;
246                                 temp |= PORT_CSC;
247                                 writel (temp, &ehci->regs->port_status [i]);
248                         }
249                         continue;
250                 }
251                 if (!(temp & PORT_CONNECT))
252                         ehci->reset_done [i] = 0;
253                 if ((temp & (PORT_CSC | PORT_PEC | PORT_OCC)) != 0
254                                 // PORT_STAT_C_SUSPEND?
255                                 || ((temp & PORT_RESUME) != 0
256                                         && time_after (jiffies,
257                                                 ehci->reset_done [i]))) {
258                         if (i < 7)
259                             buf [0] |= 1 << (i + 1);
260                         else
261                             buf [1] |= 1 << (i - 7);
262                         status = STS_PCD;
263                 }
264         }
265         /* FIXME autosuspend idle root hubs */
266         spin_unlock_irqrestore (&ehci->lock, flags);
267         return status ? retval : 0;
268 }
269
270 /*-------------------------------------------------------------------------*/
271
272 static void
273 ehci_hub_descriptor (
274         struct ehci_hcd                 *ehci,
275         struct usb_hub_descriptor       *desc
276 ) {
277         int             ports = HCS_N_PORTS (ehci->hcs_params);
278         u16             temp;
279
280         desc->bDescriptorType = 0x29;
281         desc->bPwrOn2PwrGood = 10;      /* ehci 1.0, 2.3.9 says 20ms max */
282         desc->bHubContrCurrent = 0;
283
284         desc->bNbrPorts = ports;
285         temp = 1 + (ports / 8);
286         desc->bDescLength = 7 + 2 * temp;
287
288         /* two bitmaps:  ports removable, and usb 1.0 legacy PortPwrCtrlMask */
289         memset (&desc->bitmap [0], 0, temp);
290         memset (&desc->bitmap [temp], 0xff, temp);
291
292         temp = 0x0008;                  /* per-port overcurrent reporting */
293         if (HCS_PPC (ehci->hcs_params))
294                 temp |= 0x0001;         /* per-port power control */
295         else
296                 temp |= 0x0002;         /* no power switching */
297 #if 0
298 // re-enable when we support USB_PORT_FEAT_INDICATOR below.
299         if (HCS_INDICATOR (ehci->hcs_params))
300                 temp |= 0x0080;         /* per-port indicators (LEDs) */
301 #endif
302         desc->wHubCharacteristics = (__force __u16)cpu_to_le16 (temp);
303 }
304
305 /*-------------------------------------------------------------------------*/
306
307 #define PORT_WAKE_BITS  (PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E)
308
309 static int ehci_hub_control (
310         struct usb_hcd  *hcd,
311         u16             typeReq,
312         u16             wValue,
313         u16             wIndex,
314         char            *buf,
315         u16             wLength
316 ) {
317         struct ehci_hcd *ehci = hcd_to_ehci (hcd);
318         int             ports = HCS_N_PORTS (ehci->hcs_params);
319         u32             temp, status;
320         unsigned long   flags;
321         int             retval = 0;
322
323         /*
324          * FIXME:  support SetPortFeatures USB_PORT_FEAT_INDICATOR.
325          * HCS_INDICATOR may say we can change LEDs to off/amber/green.
326          * (track current state ourselves) ... blink for diagnostics,
327          * power, "this is the one", etc.  EHCI spec supports this.
328          */
329
330         spin_lock_irqsave (&ehci->lock, flags);
331         switch (typeReq) {
332         case ClearHubFeature:
333                 switch (wValue) {
334                 case C_HUB_LOCAL_POWER:
335                 case C_HUB_OVER_CURRENT:
336                         /* no hub-wide feature/status flags */
337                         break;
338                 default:
339                         goto error;
340                 }
341                 break;
342         case ClearPortFeature:
343                 if (!wIndex || wIndex > ports)
344                         goto error;
345                 wIndex--;
346                 temp = readl (&ehci->regs->port_status [wIndex]);
347                 if (temp & PORT_OWNER)
348                         break;
349
350                 switch (wValue) {
351                 case USB_PORT_FEAT_ENABLE:
352                         writel (temp & ~PORT_PE,
353                                 &ehci->regs->port_status [wIndex]);
354                         break;
355                 case USB_PORT_FEAT_C_ENABLE:
356                         writel((temp & ~PORT_RWC_BITS) | PORT_PEC,
357                                 &ehci->regs->port_status [wIndex]);
358                         break;
359                 case USB_PORT_FEAT_SUSPEND:
360                         if (temp & PORT_RESET)
361                                 goto error;
362                         if (temp & PORT_SUSPEND) {
363                                 if ((temp & PORT_PE) == 0)
364                                         goto error;
365                                 /* resume signaling for 20 msec */
366                                 temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
367                                 writel (temp | PORT_RESUME,
368                                         &ehci->regs->port_status [wIndex]);
369                                 ehci->reset_done [wIndex] = jiffies
370                                                 + msecs_to_jiffies (20);
371                         }
372                         break;
373                 case USB_PORT_FEAT_C_SUSPEND:
374                         /* we auto-clear this feature */
375                         break;
376                 case USB_PORT_FEAT_POWER:
377                         if (HCS_PPC (ehci->hcs_params))
378                                 writel (temp & ~(PORT_RWC_BITS | PORT_POWER),
379                                         &ehci->regs->port_status [wIndex]);
380                         break;
381                 case USB_PORT_FEAT_C_CONNECTION:
382                         writel((temp & ~PORT_RWC_BITS) | PORT_CSC,
383                                 &ehci->regs->port_status [wIndex]);
384                         break;
385                 case USB_PORT_FEAT_C_OVER_CURRENT:
386                         writel((temp & ~PORT_RWC_BITS) | PORT_OCC,
387                                 &ehci->regs->port_status [wIndex]);
388                         break;
389                 case USB_PORT_FEAT_C_RESET:
390                         /* GetPortStatus clears reset */
391                         break;
392                 default:
393                         goto error;
394                 }
395                 readl (&ehci->regs->command);   /* unblock posted write */
396                 break;
397         case GetHubDescriptor:
398                 ehci_hub_descriptor (ehci, (struct usb_hub_descriptor *)
399                         buf);
400                 break;
401         case GetHubStatus:
402                 /* no hub-wide feature/status flags */
403                 memset (buf, 0, 4);
404                 //cpu_to_le32s ((u32 *) buf);
405                 break;
406         case GetPortStatus:
407                 if (!wIndex || wIndex > ports)
408                         goto error;
409                 wIndex--;
410                 status = 0;
411                 temp = readl (&ehci->regs->port_status [wIndex]);
412
413                 // wPortChange bits
414                 if (temp & PORT_CSC)
415                         status |= 1 << USB_PORT_FEAT_C_CONNECTION;
416                 if (temp & PORT_PEC)
417                         status |= 1 << USB_PORT_FEAT_C_ENABLE;
418                 if (temp & PORT_OCC)
419                         status |= 1 << USB_PORT_FEAT_C_OVER_CURRENT;
420
421                 /* whoever resumes must GetPortStatus to complete it!! */
422                 if ((temp & PORT_RESUME)
423                                 && time_after (jiffies,
424                                         ehci->reset_done [wIndex])) {
425                         status |= 1 << USB_PORT_FEAT_C_SUSPEND;
426                         ehci->reset_done [wIndex] = 0;
427
428                         /* stop resume signaling */
429                         temp = readl (&ehci->regs->port_status [wIndex]);
430                         writel (temp & ~(PORT_RWC_BITS | PORT_RESUME),
431                                 &ehci->regs->port_status [wIndex]);
432                         retval = handshake (
433                                         &ehci->regs->port_status [wIndex],
434                                         PORT_RESUME, 0, 2000 /* 2msec */);
435                         if (retval != 0) {
436                                 ehci_err (ehci, "port %d resume error %d\n",
437                                         wIndex + 1, retval);
438                                 goto error;
439                         }
440                         temp &= ~(PORT_SUSPEND|PORT_RESUME|(3<<10));
441                 }
442
443                 /* whoever resets must GetPortStatus to complete it!! */
444                 if ((temp & PORT_RESET)
445                                 && time_after (jiffies,
446                                         ehci->reset_done [wIndex])) {
447                         status |= 1 << USB_PORT_FEAT_C_RESET;
448                         ehci->reset_done [wIndex] = 0;
449
450                         /* force reset to complete */
451                         writel (temp & ~(PORT_RWC_BITS | PORT_RESET),
452                                         &ehci->regs->port_status [wIndex]);
453                         /* REVISIT:  some hardware needs 550+ usec to clear
454                          * this bit; seems too long to spin routinely...
455                          */
456                         retval = handshake (
457                                         &ehci->regs->port_status [wIndex],
458                                         PORT_RESET, 0, 750);
459                         if (retval != 0) {
460                                 ehci_err (ehci, "port %d reset error %d\n",
461                                         wIndex + 1, retval);
462                                 goto error;
463                         }
464
465                         /* see what we found out */
466                         temp = check_reset_complete (ehci, wIndex,
467                                 readl (&ehci->regs->port_status [wIndex]));
468                 }
469
470                 // don't show wPortStatus if it's owned by a companion hc
471                 if (!(temp & PORT_OWNER)) {
472                         if (temp & PORT_CONNECT) {
473                                 status |= 1 << USB_PORT_FEAT_CONNECTION;
474                                 // status may be from integrated TT
475                                 status |= ehci_port_speed(ehci, temp);
476                         }
477                         if (temp & PORT_PE)
478                                 status |= 1 << USB_PORT_FEAT_ENABLE;
479                         if (temp & (PORT_SUSPEND|PORT_RESUME))
480                                 status |= 1 << USB_PORT_FEAT_SUSPEND;
481                         if (temp & PORT_OC)
482                                 status |= 1 << USB_PORT_FEAT_OVER_CURRENT;
483                         if (temp & PORT_RESET)
484                                 status |= 1 << USB_PORT_FEAT_RESET;
485                         if (temp & PORT_POWER)
486                                 status |= 1 << USB_PORT_FEAT_POWER;
487                 }
488
489 #ifndef EHCI_VERBOSE_DEBUG
490         if (status & ~0xffff)   /* only if wPortChange is interesting */
491 #endif
492                 dbg_port (ehci, "GetStatus", wIndex + 1, temp);
493                 // we "know" this alignment is good, caller used kmalloc()...
494                 *((__le32 *) buf) = cpu_to_le32 (status);
495                 break;
496         case SetHubFeature:
497                 switch (wValue) {
498                 case C_HUB_LOCAL_POWER:
499                 case C_HUB_OVER_CURRENT:
500                         /* no hub-wide feature/status flags */
501                         break;
502                 default:
503                         goto error;
504                 }
505                 break;
506         case SetPortFeature:
507                 if (!wIndex || wIndex > ports)
508                         goto error;
509                 wIndex--;
510                 temp = readl (&ehci->regs->port_status [wIndex]);
511                 if (temp & PORT_OWNER)
512                         break;
513
514                 temp &= ~PORT_RWC_BITS;
515                 switch (wValue) {
516                 case USB_PORT_FEAT_SUSPEND:
517                         if ((temp & PORT_PE) == 0
518                                         || (temp & PORT_RESET) != 0)
519                                 goto error;
520                         if (device_may_wakeup(&hcd->self.root_hub->dev))
521                                 temp |= PORT_WAKE_BITS;
522                         writel (temp | PORT_SUSPEND,
523                                 &ehci->regs->port_status [wIndex]);
524                         break;
525                 case USB_PORT_FEAT_POWER:
526                         if (HCS_PPC (ehci->hcs_params))
527                                 writel (temp | PORT_POWER,
528                                         &ehci->regs->port_status [wIndex]);
529                         break;
530                 case USB_PORT_FEAT_RESET:
531                         if (temp & PORT_RESUME)
532                                 goto error;
533                         /* line status bits may report this as low speed,
534                          * which can be fine if this root hub has a
535                          * transaction translator built in.
536                          */
537                         if ((temp & (PORT_PE|PORT_CONNECT)) == PORT_CONNECT
538                                         && !ehci_is_TDI(ehci)
539                                         && PORT_USB11 (temp)) {
540                                 ehci_dbg (ehci,
541                                         "port %d low speed --> companion\n",
542                                         wIndex + 1);
543                                 temp |= PORT_OWNER;
544                         } else {
545                                 ehci_vdbg (ehci, "port %d reset\n", wIndex + 1);
546                                 temp |= PORT_RESET;
547                                 temp &= ~PORT_PE;
548
549                                 /*
550                                  * caller must wait, then call GetPortStatus
551                                  * usb 2.0 spec says 50 ms resets on root
552                                  */
553                                 ehci->reset_done [wIndex] = jiffies
554                                                 + msecs_to_jiffies (50);
555                         }
556                         writel (temp, &ehci->regs->port_status [wIndex]);
557                         break;
558                 default:
559                         goto error;
560                 }
561                 readl (&ehci->regs->command);   /* unblock posted writes */
562                 break;
563
564         default:
565 error:
566                 /* "stall" on error */
567                 retval = -EPIPE;
568         }
569         spin_unlock_irqrestore (&ehci->lock, flags);
570         return retval;
571 }