spidernet : fix memory leak in spider_net_stop
[linux-2.6] / 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         int                     mask;
38
39         if (time_before (jiffies, ehci->next_statechange))
40                 msleep(5);
41
42         port = HCS_N_PORTS (ehci->hcs_params);
43         spin_lock_irq (&ehci->lock);
44
45         /* stop schedules, clean any completed work */
46         if (HC_IS_RUNNING(hcd->state)) {
47                 ehci_quiesce (ehci);
48                 hcd->state = HC_STATE_QUIESCING;
49         }
50         ehci->command = readl (&ehci->regs->command);
51         if (ehci->reclaim)
52                 ehci->reclaim_ready = 1;
53         ehci_work(ehci);
54
55         /* Unlike other USB host controller types, EHCI doesn't have
56          * any notion of "global" or bus-wide suspend.  The driver has
57          * to manually suspend all the active unsuspended ports, and
58          * then manually resume them in the bus_resume() routine.
59          */
60         ehci->bus_suspended = 0;
61         while (port--) {
62                 u32 __iomem     *reg = &ehci->regs->port_status [port];
63                 u32             t1 = readl (reg) & ~PORT_RWC_BITS;
64                 u32             t2 = t1;
65
66                 /* keep track of which ports we suspend */
67                 if ((t1 & PORT_PE) && !(t1 & PORT_OWNER) &&
68                                 !(t1 & PORT_SUSPEND)) {
69                         t2 |= PORT_SUSPEND;
70                         set_bit(port, &ehci->bus_suspended);
71                 }
72
73                 /* enable remote wakeup on all ports */
74                 if (device_may_wakeup(&hcd->self.root_hub->dev))
75                         t2 |= PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E;
76                 else
77                         t2 &= ~(PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E);
78
79                 if (t1 != t2) {
80                         ehci_vdbg (ehci, "port %d, %08x -> %08x\n",
81                                 port + 1, t1, t2);
82                         writel (t2, reg);
83                 }
84         }
85
86         /* turn off now-idle HC */
87         del_timer_sync (&ehci->watchdog);
88         ehci_halt (ehci);
89         hcd->state = HC_STATE_SUSPENDED;
90
91         /* allow remote wakeup */
92         mask = INTR_MASK;
93         if (!device_may_wakeup(&hcd->self.root_hub->dev))
94                 mask &= ~STS_PCD;
95         writel(mask, &ehci->regs->intr_enable);
96         readl(&ehci->regs->intr_enable);
97
98         ehci->next_statechange = jiffies + msecs_to_jiffies(10);
99         spin_unlock_irq (&ehci->lock);
100         return 0;
101 }
102
103
104 /* caller has locked the root hub, and should reset/reinit on error */
105 static int ehci_bus_resume (struct usb_hcd *hcd)
106 {
107         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
108         u32                     temp;
109         int                     i;
110
111         if (time_before (jiffies, ehci->next_statechange))
112                 msleep(5);
113         spin_lock_irq (&ehci->lock);
114
115         /* Ideally and we've got a real resume here, and no port's power
116          * was lost.  (For PCI, that means Vaux was maintained.)  But we
117          * could instead be restoring a swsusp snapshot -- so that BIOS was
118          * the last user of the controller, not reset/pm hardware keeping
119          * state we gave to it.
120          */
121         temp = readl(&ehci->regs->intr_enable);
122         ehci_dbg(ehci, "resume root hub%s\n", temp ? "" : " after power loss");
123
124         /* at least some APM implementations will try to deliver
125          * IRQs right away, so delay them until we're ready.
126          */
127         writel(0, &ehci->regs->intr_enable);
128
129         /* re-init operational registers */
130         writel(0, &ehci->regs->segment);
131         writel(ehci->periodic_dma, &ehci->regs->frame_list);
132         writel((u32) ehci->async->qh_dma, &ehci->regs->async_next);
133
134         /* restore CMD_RUN, framelist size, and irq threshold */
135         writel (ehci->command, &ehci->regs->command);
136
137         /* manually resume the ports we suspended during bus_suspend() */
138         i = HCS_N_PORTS (ehci->hcs_params);
139         while (i--) {
140                 temp = readl (&ehci->regs->port_status [i]);
141                 temp &= ~(PORT_RWC_BITS
142                         | PORT_WKOC_E | PORT_WKDISC_E | PORT_WKCONN_E);
143                 if (test_bit(i, &ehci->bus_suspended) &&
144                                 (temp & PORT_SUSPEND)) {
145                         ehci->reset_done [i] = jiffies + msecs_to_jiffies (20);
146                         temp |= PORT_RESUME;
147                 }
148                 writel (temp, &ehci->regs->port_status [i]);
149         }
150         i = HCS_N_PORTS (ehci->hcs_params);
151         mdelay (20);
152         while (i--) {
153                 temp = readl (&ehci->regs->port_status [i]);
154                 if (test_bit(i, &ehci->bus_suspended) &&
155                                 (temp & PORT_SUSPEND)) {
156                         temp &= ~(PORT_RWC_BITS | PORT_RESUME);
157                         writel (temp, &ehci->regs->port_status [i]);
158                         ehci_vdbg (ehci, "resumed port %d\n", i + 1);
159                 }
160         }
161         (void) readl (&ehci->regs->command);
162
163         /* maybe re-activate the schedule(s) */
164         temp = 0;
165         if (ehci->async->qh_next.qh)
166                 temp |= CMD_ASE;
167         if (ehci->periodic_sched)
168                 temp |= CMD_PSE;
169         if (temp) {
170                 ehci->command |= temp;
171                 writel (ehci->command, &ehci->regs->command);
172         }
173
174         ehci->next_statechange = jiffies + msecs_to_jiffies(5);
175         hcd->state = HC_STATE_RUNNING;
176
177         /* Now we can safely re-enable irqs */
178         writel(INTR_MASK, &ehci->regs->intr_enable);
179
180         spin_unlock_irq (&ehci->lock);
181         return 0;
182 }
183
184 #else
185
186 #define ehci_bus_suspend        NULL
187 #define ehci_bus_resume         NULL
188
189 #endif  /* CONFIG_PM */
190
191 /*-------------------------------------------------------------------------*/
192
193 static int check_reset_complete (
194         struct ehci_hcd *ehci,
195         int             index,
196         int             port_status
197 ) {
198         if (!(port_status & PORT_CONNECT)) {
199                 ehci->reset_done [index] = 0;
200                 return port_status;
201         }
202
203         /* if reset finished and it's still not enabled -- handoff */
204         if (!(port_status & PORT_PE)) {
205
206                 /* with integrated TT, there's nobody to hand it to! */
207                 if (ehci_is_TDI(ehci)) {
208                         ehci_dbg (ehci,
209                                 "Failed to enable port %d on root hub TT\n",
210                                 index+1);
211                         return port_status;
212                 }
213
214                 ehci_dbg (ehci, "port %d full speed --> companion\n",
215                         index + 1);
216
217                 // what happens if HCS_N_CC(params) == 0 ?
218                 port_status |= PORT_OWNER;
219                 port_status &= ~PORT_RWC_BITS;
220                 writel (port_status, &ehci->regs->port_status [index]);
221
222         } else
223                 ehci_dbg (ehci, "port %d high speed\n", index + 1);
224
225         return port_status;
226 }
227
228 /*-------------------------------------------------------------------------*/
229
230
231 /* build "status change" packet (one or two bytes) from HC registers */
232
233 static int
234 ehci_hub_status_data (struct usb_hcd *hcd, char *buf)
235 {
236         struct ehci_hcd *ehci = hcd_to_ehci (hcd);
237         u32             temp, status = 0;
238         u32             mask;
239         int             ports, i, retval = 1;
240         unsigned long   flags;
241
242         /* if !USB_SUSPEND, root hub timers won't get shut down ... */
243         if (!HC_IS_RUNNING(hcd->state))
244                 return 0;
245
246         /* init status to no-changes */
247         buf [0] = 0;
248         ports = HCS_N_PORTS (ehci->hcs_params);
249         if (ports > 7) {
250                 buf [1] = 0;
251                 retval++;
252         }
253
254         /* Some boards (mostly VIA?) report bogus overcurrent indications,
255          * causing massive log spam unless we completely ignore them.  It
256          * may be relevant that VIA VT8235 controlers, where PORT_POWER is
257          * always set, seem to clear PORT_OCC and PORT_CSC when writing to
258          * PORT_POWER; that's surprising, but maybe within-spec.
259          */
260         if (!ignore_oc)
261                 mask = PORT_CSC | PORT_PEC | PORT_OCC;
262         else
263                 mask = PORT_CSC | PORT_PEC;
264         // PORT_RESUME from hardware ~= PORT_STAT_C_SUSPEND
265
266         /* no hub change reports (bit 0) for now (power, ...) */
267
268         /* port N changes (bit N)? */
269         spin_lock_irqsave (&ehci->lock, flags);
270         for (i = 0; i < ports; i++) {
271                 temp = readl (&ehci->regs->port_status [i]);
272                 if (temp & PORT_OWNER) {
273                         /* don't report this in GetPortStatus */
274                         if (temp & PORT_CSC) {
275                                 temp &= ~PORT_RWC_BITS;
276                                 temp |= PORT_CSC;
277                                 writel (temp, &ehci->regs->port_status [i]);
278                         }
279                         continue;
280                 }
281                 if (!(temp & PORT_CONNECT))
282                         ehci->reset_done [i] = 0;
283                 if ((temp & mask) != 0
284                                 || ((temp & PORT_RESUME) != 0
285                                         && time_after (jiffies,
286                                                 ehci->reset_done [i]))) {
287                         if (i < 7)
288                             buf [0] |= 1 << (i + 1);
289                         else
290                             buf [1] |= 1 << (i - 7);
291                         status = STS_PCD;
292                 }
293         }
294         /* FIXME autosuspend idle root hubs */
295         spin_unlock_irqrestore (&ehci->lock, flags);
296         return status ? retval : 0;
297 }
298
299 /*-------------------------------------------------------------------------*/
300
301 static void
302 ehci_hub_descriptor (
303         struct ehci_hcd                 *ehci,
304         struct usb_hub_descriptor       *desc
305 ) {
306         int             ports = HCS_N_PORTS (ehci->hcs_params);
307         u16             temp;
308
309         desc->bDescriptorType = 0x29;
310         desc->bPwrOn2PwrGood = 10;      /* ehci 1.0, 2.3.9 says 20ms max */
311         desc->bHubContrCurrent = 0;
312
313         desc->bNbrPorts = ports;
314         temp = 1 + (ports / 8);
315         desc->bDescLength = 7 + 2 * temp;
316
317         /* two bitmaps:  ports removable, and usb 1.0 legacy PortPwrCtrlMask */
318         memset (&desc->bitmap [0], 0, temp);
319         memset (&desc->bitmap [temp], 0xff, temp);
320
321         temp = 0x0008;                  /* per-port overcurrent reporting */
322         if (HCS_PPC (ehci->hcs_params))
323                 temp |= 0x0001;         /* per-port power control */
324         else
325                 temp |= 0x0002;         /* no power switching */
326 #if 0
327 // re-enable when we support USB_PORT_FEAT_INDICATOR below.
328         if (HCS_INDICATOR (ehci->hcs_params))
329                 temp |= 0x0080;         /* per-port indicators (LEDs) */
330 #endif
331         desc->wHubCharacteristics = (__force __u16)cpu_to_le16 (temp);
332 }
333
334 /*-------------------------------------------------------------------------*/
335
336 #define PORT_WAKE_BITS  (PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E)
337
338 static int ehci_hub_control (
339         struct usb_hcd  *hcd,
340         u16             typeReq,
341         u16             wValue,
342         u16             wIndex,
343         char            *buf,
344         u16             wLength
345 ) {
346         struct ehci_hcd *ehci = hcd_to_ehci (hcd);
347         int             ports = HCS_N_PORTS (ehci->hcs_params);
348         u32             temp, status;
349         unsigned long   flags;
350         int             retval = 0;
351         unsigned        selector;
352
353         /*
354          * FIXME:  support SetPortFeatures USB_PORT_FEAT_INDICATOR.
355          * HCS_INDICATOR may say we can change LEDs to off/amber/green.
356          * (track current state ourselves) ... blink for diagnostics,
357          * power, "this is the one", etc.  EHCI spec supports this.
358          */
359
360         spin_lock_irqsave (&ehci->lock, flags);
361         switch (typeReq) {
362         case ClearHubFeature:
363                 switch (wValue) {
364                 case C_HUB_LOCAL_POWER:
365                 case C_HUB_OVER_CURRENT:
366                         /* no hub-wide feature/status flags */
367                         break;
368                 default:
369                         goto error;
370                 }
371                 break;
372         case ClearPortFeature:
373                 if (!wIndex || wIndex > ports)
374                         goto error;
375                 wIndex--;
376                 temp = readl (&ehci->regs->port_status [wIndex]);
377                 if (temp & PORT_OWNER)
378                         break;
379
380                 switch (wValue) {
381                 case USB_PORT_FEAT_ENABLE:
382                         writel (temp & ~PORT_PE,
383                                 &ehci->regs->port_status [wIndex]);
384                         break;
385                 case USB_PORT_FEAT_C_ENABLE:
386                         writel((temp & ~PORT_RWC_BITS) | PORT_PEC,
387                                 &ehci->regs->port_status [wIndex]);
388                         break;
389                 case USB_PORT_FEAT_SUSPEND:
390                         if (temp & PORT_RESET)
391                                 goto error;
392                         if (ehci->no_selective_suspend)
393                                 break;
394                         if (temp & PORT_SUSPEND) {
395                                 if ((temp & PORT_PE) == 0)
396                                         goto error;
397                                 /* resume signaling for 20 msec */
398                                 temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
399                                 writel (temp | PORT_RESUME,
400                                         &ehci->regs->port_status [wIndex]);
401                                 ehci->reset_done [wIndex] = jiffies
402                                                 + msecs_to_jiffies (20);
403                         }
404                         break;
405                 case USB_PORT_FEAT_C_SUSPEND:
406                         /* we auto-clear this feature */
407                         break;
408                 case USB_PORT_FEAT_POWER:
409                         if (HCS_PPC (ehci->hcs_params))
410                                 writel (temp & ~(PORT_RWC_BITS | PORT_POWER),
411                                         &ehci->regs->port_status [wIndex]);
412                         break;
413                 case USB_PORT_FEAT_C_CONNECTION:
414                         writel((temp & ~PORT_RWC_BITS) | PORT_CSC,
415                                 &ehci->regs->port_status [wIndex]);
416                         break;
417                 case USB_PORT_FEAT_C_OVER_CURRENT:
418                         writel((temp & ~PORT_RWC_BITS) | PORT_OCC,
419                                 &ehci->regs->port_status [wIndex]);
420                         break;
421                 case USB_PORT_FEAT_C_RESET:
422                         /* GetPortStatus clears reset */
423                         break;
424                 default:
425                         goto error;
426                 }
427                 readl (&ehci->regs->command);   /* unblock posted write */
428                 break;
429         case GetHubDescriptor:
430                 ehci_hub_descriptor (ehci, (struct usb_hub_descriptor *)
431                         buf);
432                 break;
433         case GetHubStatus:
434                 /* no hub-wide feature/status flags */
435                 memset (buf, 0, 4);
436                 //cpu_to_le32s ((u32 *) buf);
437                 break;
438         case GetPortStatus:
439                 if (!wIndex || wIndex > ports)
440                         goto error;
441                 wIndex--;
442                 status = 0;
443                 temp = readl (&ehci->regs->port_status [wIndex]);
444
445                 // wPortChange bits
446                 if (temp & PORT_CSC)
447                         status |= 1 << USB_PORT_FEAT_C_CONNECTION;
448                 if (temp & PORT_PEC)
449                         status |= 1 << USB_PORT_FEAT_C_ENABLE;
450                 if ((temp & PORT_OCC) && !ignore_oc)
451                         status |= 1 << USB_PORT_FEAT_C_OVER_CURRENT;
452
453                 /* whoever resumes must GetPortStatus to complete it!! */
454                 if ((temp & PORT_RESUME)
455                                 && time_after (jiffies,
456                                         ehci->reset_done [wIndex])) {
457                         status |= 1 << USB_PORT_FEAT_C_SUSPEND;
458                         ehci->reset_done [wIndex] = 0;
459
460                         /* stop resume signaling */
461                         temp = readl (&ehci->regs->port_status [wIndex]);
462                         writel (temp & ~(PORT_RWC_BITS | PORT_RESUME),
463                                 &ehci->regs->port_status [wIndex]);
464                         retval = handshake (
465                                         &ehci->regs->port_status [wIndex],
466                                         PORT_RESUME, 0, 2000 /* 2msec */);
467                         if (retval != 0) {
468                                 ehci_err (ehci, "port %d resume error %d\n",
469                                         wIndex + 1, retval);
470                                 goto error;
471                         }
472                         temp &= ~(PORT_SUSPEND|PORT_RESUME|(3<<10));
473                 }
474
475                 /* whoever resets must GetPortStatus to complete it!! */
476                 if ((temp & PORT_RESET)
477                                 && time_after (jiffies,
478                                         ehci->reset_done [wIndex])) {
479                         status |= 1 << USB_PORT_FEAT_C_RESET;
480                         ehci->reset_done [wIndex] = 0;
481
482                         /* force reset to complete */
483                         writel (temp & ~(PORT_RWC_BITS | PORT_RESET),
484                                         &ehci->regs->port_status [wIndex]);
485                         /* REVISIT:  some hardware needs 550+ usec to clear
486                          * this bit; seems too long to spin routinely...
487                          */
488                         retval = handshake (
489                                         &ehci->regs->port_status [wIndex],
490                                         PORT_RESET, 0, 750);
491                         if (retval != 0) {
492                                 ehci_err (ehci, "port %d reset error %d\n",
493                                         wIndex + 1, retval);
494                                 goto error;
495                         }
496
497                         /* see what we found out */
498                         temp = check_reset_complete (ehci, wIndex,
499                                 readl (&ehci->regs->port_status [wIndex]));
500                 }
501
502                 // don't show wPortStatus if it's owned by a companion hc
503                 if (!(temp & PORT_OWNER)) {
504                         if (temp & PORT_CONNECT) {
505                                 status |= 1 << USB_PORT_FEAT_CONNECTION;
506                                 // status may be from integrated TT
507                                 status |= ehci_port_speed(ehci, temp);
508                         }
509                         if (temp & PORT_PE)
510                                 status |= 1 << USB_PORT_FEAT_ENABLE;
511                         if (temp & (PORT_SUSPEND|PORT_RESUME))
512                                 status |= 1 << USB_PORT_FEAT_SUSPEND;
513                         if (temp & PORT_OC)
514                                 status |= 1 << USB_PORT_FEAT_OVER_CURRENT;
515                         if (temp & PORT_RESET)
516                                 status |= 1 << USB_PORT_FEAT_RESET;
517                         if (temp & PORT_POWER)
518                                 status |= 1 << USB_PORT_FEAT_POWER;
519                 }
520
521 #ifndef EHCI_VERBOSE_DEBUG
522         if (status & ~0xffff)   /* only if wPortChange is interesting */
523 #endif
524                 dbg_port (ehci, "GetStatus", wIndex + 1, temp);
525                 // we "know" this alignment is good, caller used kmalloc()...
526                 *((__le32 *) buf) = cpu_to_le32 (status);
527                 break;
528         case SetHubFeature:
529                 switch (wValue) {
530                 case C_HUB_LOCAL_POWER:
531                 case C_HUB_OVER_CURRENT:
532                         /* no hub-wide feature/status flags */
533                         break;
534                 default:
535                         goto error;
536                 }
537                 break;
538         case SetPortFeature:
539                 selector = wIndex >> 8;
540                 wIndex &= 0xff;
541                 if (!wIndex || wIndex > ports)
542                         goto error;
543                 wIndex--;
544                 temp = readl (&ehci->regs->port_status [wIndex]);
545                 if (temp & PORT_OWNER)
546                         break;
547
548                 temp &= ~PORT_RWC_BITS;
549                 switch (wValue) {
550                 case USB_PORT_FEAT_SUSPEND:
551                         if (ehci->no_selective_suspend)
552                                 break;
553                         if ((temp & PORT_PE) == 0
554                                         || (temp & PORT_RESET) != 0)
555                                 goto error;
556                         if (device_may_wakeup(&hcd->self.root_hub->dev))
557                                 temp |= PORT_WAKE_BITS;
558                         writel (temp | PORT_SUSPEND,
559                                 &ehci->regs->port_status [wIndex]);
560                         break;
561                 case USB_PORT_FEAT_POWER:
562                         if (HCS_PPC (ehci->hcs_params))
563                                 writel (temp | PORT_POWER,
564                                         &ehci->regs->port_status [wIndex]);
565                         break;
566                 case USB_PORT_FEAT_RESET:
567                         if (temp & PORT_RESUME)
568                                 goto error;
569                         /* line status bits may report this as low speed,
570                          * which can be fine if this root hub has a
571                          * transaction translator built in.
572                          */
573                         if ((temp & (PORT_PE|PORT_CONNECT)) == PORT_CONNECT
574                                         && !ehci_is_TDI(ehci)
575                                         && PORT_USB11 (temp)) {
576                                 ehci_dbg (ehci,
577                                         "port %d low speed --> companion\n",
578                                         wIndex + 1);
579                                 temp |= PORT_OWNER;
580                         } else {
581                                 ehci_vdbg (ehci, "port %d reset\n", wIndex + 1);
582                                 temp |= PORT_RESET;
583                                 temp &= ~PORT_PE;
584
585                                 /*
586                                  * caller must wait, then call GetPortStatus
587                                  * usb 2.0 spec says 50 ms resets on root
588                                  */
589                                 ehci->reset_done [wIndex] = jiffies
590                                                 + msecs_to_jiffies (50);
591                         }
592                         writel (temp, &ehci->regs->port_status [wIndex]);
593                         break;
594
595                 /* For downstream facing ports (these):  one hub port is put
596                  * into test mode according to USB2 11.24.2.13, then the hub
597                  * must be reset (which for root hub now means rmmod+modprobe,
598                  * or else system reboot).  See EHCI 2.3.9 and 4.14 for info
599                  * about the EHCI-specific stuff.
600                  */
601                 case USB_PORT_FEAT_TEST:
602                         if (!selector || selector > 5)
603                                 goto error;
604                         ehci_quiesce(ehci);
605                         ehci_halt(ehci);
606                         temp |= selector << 16;
607                         writel (temp, &ehci->regs->port_status [wIndex]);
608                         break;
609
610                 default:
611                         goto error;
612                 }
613                 readl (&ehci->regs->command);   /* unblock posted writes */
614                 break;
615
616         default:
617 error:
618                 /* "stall" on error */
619                 retval = -EPIPE;
620         }
621         spin_unlock_irqrestore (&ehci->lock, flags);
622         return retval;
623 }