Line data Source code
1 : /*
2 : * OHCI HCD (Host Controller Driver) for USB.
3 : *
4 : * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
5 : * (C) Copyright 2000-2004 David Brownell <dbrownell@users.sourceforge.net>
6 : *
7 : * This file is licenced under GPL
8 : */
9 :
10 : /*-------------------------------------------------------------------------*/
11 :
12 : /*
13 : * OHCI Root Hub ... the nonsharable stuff
14 : */
15 :
16 : #define dbg_port(hc,label,num,value) \
17 : ohci_dbg (hc, \
18 : "%s roothub.portstatus [%d] " \
19 : "= 0x%08x%s%s%s%s%s%s%s%s%s%s%s%s\n", \
20 : label, num, temp, \
21 : (temp & RH_PS_PRSC) ? " PRSC" : "", \
22 : (temp & RH_PS_OCIC) ? " OCIC" : "", \
23 : (temp & RH_PS_PSSC) ? " PSSC" : "", \
24 : (temp & RH_PS_PESC) ? " PESC" : "", \
25 : (temp & RH_PS_CSC) ? " CSC" : "", \
26 : \
27 : (temp & RH_PS_LSDA) ? " LSDA" : "", \
28 : (temp & RH_PS_PPS) ? " PPS" : "", \
29 : (temp & RH_PS_PRS) ? " PRS" : "", \
30 : (temp & RH_PS_POCI) ? " POCI" : "", \
31 : (temp & RH_PS_PSS) ? " PSS" : "", \
32 : \
33 : (temp & RH_PS_PES) ? " PES" : "", \
34 : (temp & RH_PS_CCS) ? " CCS" : "" \
35 : );
36 :
37 : /*-------------------------------------------------------------------------*/
38 :
39 : #define OHCI_SCHED_ENABLES \
40 : (OHCI_CTRL_CLE|OHCI_CTRL_BLE|OHCI_CTRL_PLE|OHCI_CTRL_IE)
41 :
42 : static void dl_done_list (struct ohci_hcd *);
43 : static void finish_unlinks (struct ohci_hcd *, u16);
44 :
45 : #ifdef CONFIG_PM
46 : static int ohci_rh_suspend (struct ohci_hcd *ohci, int autostop)
47 : __releases(ohci->lock)
48 : __acquires(ohci->lock)
49 : {
50 : int status = 0;
51 :
52 : ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
53 : switch (ohci->hc_control & OHCI_CTRL_HCFS) {
54 : case OHCI_USB_RESUME:
55 : ohci_dbg (ohci, "resume/suspend?\n");
56 : ohci->hc_control &= ~OHCI_CTRL_HCFS;
57 : ohci->hc_control |= OHCI_USB_RESET;
58 : ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
59 : (void) ohci_readl (ohci, &ohci->regs->control);
60 : /* FALL THROUGH */
61 : case OHCI_USB_RESET:
62 : status = -EBUSY;
63 : ohci_dbg (ohci, "needs reinit!\n");
64 : goto done;
65 : case OHCI_USB_SUSPEND:
66 : if (!ohci->autostop) {
67 : ohci_dbg (ohci, "already suspended\n");
68 : goto done;
69 : }
70 : }
71 : ohci_dbg (ohci, "%s root hub\n",
72 : autostop ? "auto-stop" : "suspend");
73 :
74 : /* First stop any processing */
75 : if (!autostop && (ohci->hc_control & OHCI_SCHED_ENABLES)) {
76 : ohci->hc_control &= ~OHCI_SCHED_ENABLES;
77 : ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
78 : ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
79 : ohci_writel (ohci, OHCI_INTR_SF, &ohci->regs->intrstatus);
80 :
81 : /* sched disables take effect on the next frame,
82 : * then the last WDH could take 6+ msec
83 : */
84 : ohci_dbg (ohci, "stopping schedules ...\n");
85 : ohci->autostop = 0;
86 : spin_unlock_irq (&ohci->lock);
87 : msleep (8);
88 : spin_lock_irq (&ohci->lock);
89 : }
90 : dl_done_list (ohci);
91 : finish_unlinks (ohci, ohci_frame_no(ohci));
92 :
93 : /* maybe resume can wake root hub */
94 : if (ohci_to_hcd(ohci)->self.root_hub->do_remote_wakeup || autostop) {
95 : ohci->hc_control |= OHCI_CTRL_RWE;
96 : } else {
97 : ohci_writel(ohci, OHCI_INTR_RHSC | OHCI_INTR_RD,
98 : &ohci->regs->intrdisable);
99 : ohci->hc_control &= ~OHCI_CTRL_RWE;
100 : }
101 :
102 : /* Suspend hub ... this is the "global (to this bus) suspend" mode,
103 : * which doesn't imply ports will first be individually suspended.
104 : */
105 : ohci->hc_control &= ~OHCI_CTRL_HCFS;
106 : ohci->hc_control |= OHCI_USB_SUSPEND;
107 : ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
108 : (void) ohci_readl (ohci, &ohci->regs->control);
109 :
110 : /* no resumes until devices finish suspending */
111 : if (!autostop) {
112 : ohci->next_statechange = jiffies + msecs_to_jiffies (5);
113 : ohci->autostop = 0;
114 : }
115 :
116 : done:
117 : return status;
118 : }
119 :
120 : static inline struct ed *find_head (struct ed *ed)
121 : {
122 : /* for bulk and control lists */
123 : while (ed->ed_prev)
124 : ed = ed->ed_prev;
125 : return ed;
126 : }
127 :
128 : /* caller has locked the root hub */
129 : static int ohci_rh_resume (struct ohci_hcd *ohci)
130 : __releases(ohci->lock)
131 : __acquires(ohci->lock)
132 : {
133 : struct usb_hcd *hcd = ohci_to_hcd (ohci);
134 : u32 temp, enables;
135 : int status = -EINPROGRESS;
136 : int autostopped = ohci->autostop;
137 :
138 : ohci->autostop = 0;
139 : ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
140 :
141 : if (ohci->hc_control & (OHCI_CTRL_IR | OHCI_SCHED_ENABLES)) {
142 : /* this can happen after resuming a swsusp snapshot */
143 : if (hcd->state == HC_STATE_RESUMING) {
144 : ohci_dbg (ohci, "BIOS/SMM active, control %03x\n",
145 : ohci->hc_control);
146 : status = -EBUSY;
147 : /* this happens when pmcore resumes HC then root */
148 : } else {
149 : ohci_dbg (ohci, "duplicate resume\n");
150 : status = 0;
151 : }
152 : } else switch (ohci->hc_control & OHCI_CTRL_HCFS) {
153 : case OHCI_USB_SUSPEND:
154 : ohci->hc_control &= ~(OHCI_CTRL_HCFS|OHCI_SCHED_ENABLES);
155 : ohci->hc_control |= OHCI_USB_RESUME;
156 : ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
157 : (void) ohci_readl (ohci, &ohci->regs->control);
158 : ohci_dbg (ohci, "%s root hub\n",
159 : autostopped ? "auto-start" : "resume");
160 : break;
161 : case OHCI_USB_RESUME:
162 : /* HCFS changes sometime after INTR_RD */
163 : ohci_dbg(ohci, "%swakeup root hub\n",
164 : autostopped ? "auto-" : "");
165 : break;
166 : case OHCI_USB_OPER:
167 : /* this can happen after resuming a swsusp snapshot */
168 : ohci_dbg (ohci, "snapshot resume? reinit\n");
169 : status = -EBUSY;
170 : break;
171 : default: /* RESET, we lost power */
172 : ohci_dbg (ohci, "lost power\n");
173 : status = -EBUSY;
174 : }
175 : if (status == -EBUSY) {
176 : if (!autostopped) {
177 : spin_unlock_irq (&ohci->lock);
178 : (void) ohci_init (ohci);
179 : status = ohci_restart (ohci);
180 :
181 : usb_root_hub_lost_power(hcd->self.root_hub);
182 :
183 : spin_lock_irq (&ohci->lock);
184 : }
185 : return status;
186 : }
187 : if (status != -EINPROGRESS)
188 : return status;
189 : if (autostopped)
190 : goto skip_resume;
191 : spin_unlock_irq (&ohci->lock);
192 :
193 : /* Some controllers (lucent erratum) need extra-long delays */
194 : msleep (20 /* usb 11.5.1.10 */ + 12 /* 32 msec counter */ + 1);
195 :
196 : temp = ohci_readl (ohci, &ohci->regs->control);
197 : temp &= OHCI_CTRL_HCFS;
198 : if (temp != OHCI_USB_RESUME) {
199 : ohci_err (ohci, "controller won't resume\n");
200 : spin_lock_irq(&ohci->lock);
201 : return -EBUSY;
202 : }
203 :
204 : /* disable old schedule state, reinit from scratch */
205 : ohci_writel (ohci, 0, &ohci->regs->ed_controlhead);
206 : ohci_writel (ohci, 0, &ohci->regs->ed_controlcurrent);
207 : ohci_writel (ohci, 0, &ohci->regs->ed_bulkhead);
208 : ohci_writel (ohci, 0, &ohci->regs->ed_bulkcurrent);
209 : ohci_writel (ohci, 0, &ohci->regs->ed_periodcurrent);
210 : ohci_writel (ohci, (u32) ohci->hcca_dma, &ohci->regs->hcca);
211 :
212 : /* Sometimes PCI D3 suspend trashes frame timings ... */
213 : periodic_reinit (ohci);
214 :
215 : /* the following code is executed with ohci->lock held and
216 : * irqs disabled if and only if autostopped is true
217 : */
218 :
219 : skip_resume:
220 : /* interrupts might have been disabled */
221 : ohci_writel (ohci, OHCI_INTR_INIT, &ohci->regs->intrenable);
222 : if (ohci->ed_rm_list)
223 : ohci_writel (ohci, OHCI_INTR_SF, &ohci->regs->intrenable);
224 :
225 : /* Then re-enable operations */
226 : ohci_writel (ohci, OHCI_USB_OPER, &ohci->regs->control);
227 : (void) ohci_readl (ohci, &ohci->regs->control);
228 : if (!autostopped)
229 : msleep (3);
230 :
231 : temp = ohci->hc_control;
232 : temp &= OHCI_CTRL_RWC;
233 : temp |= OHCI_CONTROL_INIT | OHCI_USB_OPER;
234 : ohci->hc_control = temp;
235 : ohci_writel (ohci, temp, &ohci->regs->control);
236 : (void) ohci_readl (ohci, &ohci->regs->control);
237 :
238 : /* TRSMRCY */
239 : if (!autostopped) {
240 : msleep (10);
241 : spin_lock_irq (&ohci->lock);
242 : }
243 : /* now ohci->lock is always held and irqs are always disabled */
244 :
245 : /* keep it alive for more than ~5x suspend + resume costs */
246 : ohci->next_statechange = jiffies + STATECHANGE_DELAY;
247 :
248 : /* maybe turn schedules back on */
249 : enables = 0;
250 : temp = 0;
251 : if (!ohci->ed_rm_list) {
252 : if (ohci->ed_controltail) {
253 : ohci_writel (ohci,
254 : find_head (ohci->ed_controltail)->dma,
255 : &ohci->regs->ed_controlhead);
256 : enables |= OHCI_CTRL_CLE;
257 : temp |= OHCI_CLF;
258 : }
259 : if (ohci->ed_bulktail) {
260 : ohci_writel (ohci, find_head (ohci->ed_bulktail)->dma,
261 : &ohci->regs->ed_bulkhead);
262 : enables |= OHCI_CTRL_BLE;
263 : temp |= OHCI_BLF;
264 : }
265 : }
266 : if (hcd->self.bandwidth_isoc_reqs || hcd->self.bandwidth_int_reqs)
267 : enables |= OHCI_CTRL_PLE|OHCI_CTRL_IE;
268 : if (enables) {
269 : ohci_dbg (ohci, "restarting schedules ... %08x\n", enables);
270 : ohci->hc_control |= enables;
271 : ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
272 : if (temp)
273 : ohci_writel (ohci, temp, &ohci->regs->cmdstatus);
274 : (void) ohci_readl (ohci, &ohci->regs->control);
275 : }
276 :
277 : return 0;
278 : }
279 :
280 : static int ohci_bus_suspend (struct usb_hcd *hcd)
281 : {
282 : struct ohci_hcd *ohci = hcd_to_ohci (hcd);
283 : int rc;
284 :
285 : spin_lock_irq (&ohci->lock);
286 :
287 : if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)))
288 : rc = -ESHUTDOWN;
289 : else
290 : rc = ohci_rh_suspend (ohci, 0);
291 : spin_unlock_irq (&ohci->lock);
292 : return rc;
293 : }
294 :
295 : static int ohci_bus_resume (struct usb_hcd *hcd)
296 : {
297 : struct ohci_hcd *ohci = hcd_to_ohci (hcd);
298 : int rc;
299 :
300 : if (time_before (jiffies, ohci->next_statechange))
301 : msleep(5);
302 :
303 : spin_lock_irq (&ohci->lock);
304 :
305 : if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)))
306 : rc = -ESHUTDOWN;
307 : else
308 : rc = ohci_rh_resume (ohci);
309 : spin_unlock_irq (&ohci->lock);
310 :
311 : /* poll until we know a device is connected or we autostop */
312 : if (rc == 0)
313 : usb_hcd_poll_rh_status(hcd);
314 : return rc;
315 : }
316 :
317 : /* Carry out the final steps of resuming the controller device */
318 : static void ohci_finish_controller_resume(struct usb_hcd *hcd)
319 : {
320 : struct ohci_hcd *ohci = hcd_to_ohci(hcd);
321 : int port;
322 : bool need_reinit = false;
323 :
324 : /* See if the controller is already running or has been reset */
325 : ohci->hc_control = ohci_readl(ohci, &ohci->regs->control);
326 : if (ohci->hc_control & (OHCI_CTRL_IR | OHCI_SCHED_ENABLES)) {
327 : need_reinit = true;
328 : } else {
329 : switch (ohci->hc_control & OHCI_CTRL_HCFS) {
330 : case OHCI_USB_OPER:
331 : case OHCI_USB_RESET:
332 : need_reinit = true;
333 : }
334 : }
335 :
336 : /* If needed, reinitialize and suspend the root hub */
337 : if (need_reinit) {
338 : spin_lock_irq(&ohci->lock);
339 : hcd->state = HC_STATE_RESUMING;
340 : ohci_rh_resume(ohci);
341 : hcd->state = HC_STATE_QUIESCING;
342 : ohci_rh_suspend(ohci, 0);
343 : hcd->state = HC_STATE_SUSPENDED;
344 : spin_unlock_irq(&ohci->lock);
345 : }
346 :
347 : /* Normally just turn on port power and enable interrupts */
348 : else {
349 : ohci_dbg(ohci, "powerup ports\n");
350 : for (port = 0; port < ohci->num_ports; port++)
351 : ohci_writel(ohci, RH_PS_PPS,
352 : &ohci->regs->roothub.portstatus[port]);
353 :
354 : ohci_writel(ohci, OHCI_INTR_MIE, &ohci->regs->intrenable);
355 : ohci_readl(ohci, &ohci->regs->intrenable);
356 : msleep(20);
357 : }
358 : }
359 :
360 : /* Carry out polling-, autostop-, and autoresume-related state changes */
361 : static int ohci_root_hub_state_changes(struct ohci_hcd *ohci, int changed,
362 : int any_connected, int rhsc_status)
363 : {
364 : int poll_rh = 1;
365 : int rhsc_enable;
366 :
367 : /* Some broken controllers never turn off RHCS in the interrupt
368 : * status register. For their sake we won't re-enable RHSC
369 : * interrupts if the interrupt bit is already active.
370 : */
371 : rhsc_enable = ohci_readl(ohci, &ohci->regs->intrenable) &
372 : OHCI_INTR_RHSC;
373 :
374 : switch (ohci->hc_control & OHCI_CTRL_HCFS) {
375 : case OHCI_USB_OPER:
376 : /* If no status changes are pending, enable RHSC interrupts. */
377 : if (!rhsc_enable && !rhsc_status && !changed) {
378 : rhsc_enable = OHCI_INTR_RHSC;
379 : ohci_writel(ohci, rhsc_enable, &ohci->regs->intrenable);
380 : }
381 :
382 : /* Keep on polling until we know a device is connected
383 : * and RHSC is enabled, or until we autostop.
384 : */
385 : if (!ohci->autostop) {
386 : if (any_connected ||
387 : !device_may_wakeup(&ohci_to_hcd(ohci)
388 : ->self.root_hub->dev)) {
389 : if (rhsc_enable)
390 : poll_rh = 0;
391 : } else {
392 : ohci->autostop = 1;
393 : ohci->next_statechange = jiffies + HZ;
394 : }
395 :
396 : /* if no devices have been attached for one second, autostop */
397 : } else {
398 : if (changed || any_connected) {
399 : ohci->autostop = 0;
400 : ohci->next_statechange = jiffies +
401 : STATECHANGE_DELAY;
402 : } else if (time_after_eq(jiffies,
403 : ohci->next_statechange)
404 : && !ohci->ed_rm_list
405 : && !(ohci->hc_control &
406 : OHCI_SCHED_ENABLES)) {
407 : ohci_rh_suspend(ohci, 1);
408 : if (rhsc_enable)
409 : poll_rh = 0;
410 : }
411 : }
412 : break;
413 :
414 : case OHCI_USB_SUSPEND:
415 : case OHCI_USB_RESUME:
416 : /* if there is a port change, autostart or ask to be resumed */
417 : if (changed) {
418 : if (ohci->autostop)
419 : ohci_rh_resume(ohci);
420 : else
421 : usb_hcd_resume_root_hub(ohci_to_hcd(ohci));
422 :
423 : /* If remote wakeup is disabled, stop polling */
424 : } else if (!ohci->autostop &&
425 : !ohci_to_hcd(ohci)->self.root_hub->
426 : do_remote_wakeup) {
427 : poll_rh = 0;
428 :
429 : } else {
430 : /* If no status changes are pending,
431 : * enable RHSC interrupts
432 : */
433 : if (!rhsc_enable && !rhsc_status) {
434 : rhsc_enable = OHCI_INTR_RHSC;
435 : ohci_writel(ohci, rhsc_enable,
436 : &ohci->regs->intrenable);
437 : }
438 : /* Keep polling until RHSC is enabled */
439 : if (rhsc_enable)
440 : poll_rh = 0;
441 : }
442 : break;
443 : }
444 : return poll_rh;
445 : }
446 :
447 : #else /* CONFIG_PM */
448 :
449 : static inline int ohci_rh_resume(struct ohci_hcd *ohci)
450 : {
451 1 : return 0;
452 : }
453 :
454 : /* Carry out polling-related state changes.
455 : * autostop isn't used when CONFIG_PM is turned off.
456 : */
457 : static int ohci_root_hub_state_changes(struct ohci_hcd *ohci, int changed,
458 : int any_connected, int rhsc_status)
459 : {
460 1 : /* If RHSC is enabled, don't poll */
461 4 : if (ohci_readl(ohci, &ohci->regs->intrenable) & OHCI_INTR_RHSC)
462 1 : return 0;
463 :
464 : /* If status changes are pending, continue polling.
465 : * Conversely, if no status changes are pending but the RHSC
466 : * status bit was set, then RHSC may be broken so continue polling.
467 : */
468 2 : if (changed || rhsc_status)
469 1 : return 1;
470 :
471 : /* It's safe to re-enable RHSC interrupts */
472 2 : ohci_writel(ohci, OHCI_INTR_RHSC, &ohci->regs->intrenable);
473 1 : return 0;
474 : }
475 :
476 : #endif /* CONFIG_PM */
477 :
478 : /*-------------------------------------------------------------------------*/
479 :
480 : /* build "status change" packet (one or two bytes) from HC registers */
481 :
482 : static int
483 : ohci_hub_status_data (struct usb_hcd *hcd, char *buf)
484 : {
485 4 : struct ohci_hcd *ohci = hcd_to_ohci (hcd);
486 3 : int i, changed = 0, length = 1;
487 2 : int any_connected = 0;
488 1 : int rhsc_status;
489 1 : unsigned long flags;
490 1 :
491 4 : spin_lock_irqsave (&ohci->lock, flags);
492 5 : if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags))
493 2 : goto done;
494 1 :
495 1 : /* undocumented erratum seen on at least rev D */
496 10 : if ((ohci->flags & OHCI_QUIRK_AMD756)
497 1 : && (roothub_a (ohci) & RH_A_NDP) > MAX_ROOT_PORTS) {
498 11 : ohci_warn (ohci, "bogus NDP, rereads as NDP=%d\n",
499 1 : ohci_readl (ohci, &ohci->regs->roothub.a) & RH_A_NDP);
500 1 : /* retry later; "should not happen" */
501 2 : goto done;
502 1 : }
503 1 :
504 1 : /* init status */
505 7 : if (roothub_status (ohci) & (RH_HS_LPSC | RH_HS_OCIC))
506 2 : buf [0] = changed = 1;
507 : else
508 1 : buf [0] = 0;
509 2 : if (ohci->num_ports > 7) {
510 1 : buf [1] = 0;
511 1 : length++;
512 : }
513 :
514 : /* Clear the RHSC status flag before reading the port statuses */
515 2 : ohci_writel(ohci, OHCI_INTR_RHSC, &ohci->regs->intrstatus);
516 3 : rhsc_status = ohci_readl(ohci, &ohci->regs->intrstatus) &
517 : OHCI_INTR_RHSC;
518 :
519 : /* look at each port */
520 5 : for (i = 0; i < ohci->num_ports; i++) {
521 7 : u32 status = roothub_portstatus (ohci, i);
522 1 :
523 : /* can't autostop if ports are connected */
524 1 : any_connected |= (status & RH_PS_CCS);
525 :
526 2 : if (status & (RH_PS_CSC | RH_PS_PESC | RH_PS_PSSC
527 : | RH_PS_OCIC | RH_PS_PRSC)) {
528 1 : changed = 1;
529 2 : if (i < 7)
530 1 : buf [0] |= 1 << (i + 1);
531 : else
532 1 : buf [1] |= 1 << (i - 7);
533 : }
534 : }
535 :
536 4 : hcd->poll_rh = ohci_root_hub_state_changes(ohci, changed,
537 : any_connected, rhsc_status);
538 1 :
539 : done:
540 6 : spin_unlock_irqrestore (&ohci->lock, flags);
541 :
542 6 : return changed ? length : 0;
543 : }
544 :
545 : /*-------------------------------------------------------------------------*/
546 :
547 : static void
548 : ohci_hub_descriptor (
549 : struct ohci_hcd *ohci,
550 1 : struct usb_hub_descriptor *desc
551 1 : ) {
552 6 : u32 rh = roothub_a (ohci);
553 : u16 temp;
554 :
555 1 : desc->bDescriptorType = 0x29;
556 1 : desc->bPwrOn2PwrGood = (rh & RH_A_POTPGT) >> 24;
557 1 : desc->bHubContrCurrent = 0;
558 :
559 2 : desc->bNbrPorts = ohci->num_ports;
560 1 : temp = 1 + (ohci->num_ports / 8);
561 1 : desc->bDescLength = 7 + 2 * temp;
562 :
563 1 : temp = 0;
564 2 : if (rh & RH_A_NPS) /* no power switching? */
565 1 : temp |= 0x0002;
566 2 : if (rh & RH_A_PSM) /* per-port power switching? */
567 1 : temp |= 0x0001;
568 2 : if (rh & RH_A_NOCP) /* no overcurrent reporting? */
569 1 : temp |= 0x0010;
570 2 : else if (rh & RH_A_OCPM) /* per-port overcurrent reporting? */
571 1 : temp |= 0x0008;
572 2 : desc->wHubCharacteristics = (__force __u16)cpu_to_hc16(ohci, temp);
573 :
574 : /* two bitmaps: ports removable, and usb 1.0 legacy PortPwrCtrlMask */
575 2 : rh = roothub_b (ohci);
576 1 : memset(desc->bitmap, 0xff, sizeof(desc->bitmap));
577 1 : desc->bitmap [0] = rh & RH_B_DR;
578 2 : if (ohci->num_ports > 7) {
579 1 : desc->bitmap [1] = (rh & RH_B_DR) >> 8;
580 1 : desc->bitmap [2] = 0xff;
581 : } else
582 1 : desc->bitmap [1] = 0xff;
583 1 : }
584 :
585 : /*-------------------------------------------------------------------------*/
586 :
587 : #ifdef CONFIG_USB_OTG
588 :
589 : static int ohci_start_port_reset (struct usb_hcd *hcd, unsigned port)
590 : {
591 : struct ohci_hcd *ohci = hcd_to_ohci (hcd);
592 : u32 status;
593 :
594 : if (!port)
595 : return -EINVAL;
596 : port--;
597 :
598 : /* start port reset before HNP protocol times out */
599 : status = ohci_readl(ohci, &ohci->regs->roothub.portstatus [port]);
600 : if (!(status & RH_PS_CCS))
601 : return -ENODEV;
602 :
603 : /* khubd will finish the reset later */
604 : ohci_writel(ohci, RH_PS_PRS, &ohci->regs->roothub.portstatus [port]);
605 : return 0;
606 : }
607 :
608 : #else
609 :
610 : #define ohci_start_port_reset NULL
611 :
612 : #endif
613 :
614 : /*-------------------------------------------------------------------------*/
615 :
616 :
617 : /* See usb 7.1.7.5: root hubs must issue at least 50 msec reset signaling,
618 : * not necessarily continuous ... to guard against resume signaling.
619 : * The short timeout is safe for non-root hubs, and is backward-compatible
620 : * with earlier Linux hosts.
621 : */
622 : #ifdef CONFIG_USB_SUSPEND
623 : #define PORT_RESET_MSEC 50
624 : #else
625 : #define PORT_RESET_MSEC 10
626 : #endif
627 :
628 : /* this timer value might be vendor-specific ... */
629 : #define PORT_RESET_HW_MSEC 10
630 :
631 : /* wrap-aware logic morphed from <linux/jiffies.h> */
632 : #define tick_before(t1,t2) ((s16)(((s16)(t1))-((s16)(t2))) < 0)
633 :
634 : /* called from some task, normally khubd */
635 : static inline int root_port_reset (struct ohci_hcd *ohci, unsigned port)
636 : {
637 2 : __hc32 __iomem *portstat = &ohci->regs->roothub.portstatus [port];
638 2 : u32 temp = 0;
639 4 : u16 now = ohci_readl(ohci, &ohci->regs->fmnumber);
640 2 : u16 reset_done = now + PORT_RESET_MSEC;
641 2 : int limit_1 = DIV_ROUND_UP(PORT_RESET_MSEC, PORT_RESET_HW_MSEC);
642 1 :
643 2 : /* build a "continuous enough" reset signal, with up to
644 1 : * 3msec gap between pulses. scheduler HZ==100 must work;
645 : * this might need to be deadline-scheduled.
646 : */
647 : do {
648 : int limit_2;
649 :
650 : /* spin until any current reset finishes */
651 1 : limit_2 = PORT_RESET_HW_MSEC * 2;
652 4 : while (--limit_2 >= 0) {
653 3 : temp = ohci_readl (ohci, portstat);
654 1 : /* handle e.g. CardBus eject */
655 2 : if (temp == ~(u32)0)
656 1 : return -ESHUTDOWN;
657 2 : if (!(temp & RH_PS_PRS))
658 2 : break;
659 1 : udelay (500);
660 : }
661 1 :
662 : /* timeout (a hardware error) has been observed when
663 : * EHCI sets CF while this driver is resetting a port;
664 : * presumably other disconnect paths might do it too.
665 : */
666 4 : if (limit_2 < 0) {
667 : ohci_dbg(ohci,
668 : "port[%d] reset timeout, stat %08x\n",
669 : port, temp);
670 2 : break;
671 : }
672 :
673 4 : if (!(temp & RH_PS_CCS))
674 2 : break;
675 4 : if (temp & RH_PS_PRSC)
676 4 : ohci_writel (ohci, RH_PS_PRSC, portstat);
677 :
678 : /* start the next reset, sleep till it's probably done */
679 6 : ohci_writel (ohci, RH_PS_PRS, portstat);
680 1 : msleep(PORT_RESET_HW_MSEC);
681 3 : now = ohci_readl(ohci, &ohci->regs->fmnumber);
682 5 : } while (tick_before(now, reset_done) && --limit_1 >= 0);
683 :
684 1 : /* caller synchronizes using PRSC ... and handles PRS
685 : * still being set when this returns.
686 : */
687 1 :
688 3 : return 0;
689 : }
690 :
691 : static int ohci_hub_control (
692 1 : struct usb_hcd *hcd,
693 : u16 typeReq,
694 1 : u16 wValue,
695 1 : u16 wIndex,
696 1 : char *buf,
697 1 : u16 wLength
698 1 : ) {
699 4 : struct ohci_hcd *ohci = hcd_to_ohci (hcd);
700 2 : int ports = ohci->num_ports;
701 1 : u32 temp;
702 1 : int retval = 0;
703 :
704 6 : if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)))
705 1 : return -ESHUTDOWN;
706 :
707 : switch (typeReq) {
708 3 : case ClearHubFeature:
709 : switch (wValue) {
710 3 : case C_HUB_OVER_CURRENT:
711 2 : ohci_writel (ohci, RH_HS_OCIC,
712 : &ohci->regs->roothub.status);
713 4 : case C_HUB_LOCAL_POWER:
714 2 : break;
715 2 : default:
716 2 : goto error;
717 : }
718 2 : break;
719 4 : case ClearPortFeature:
720 4 : if (!wIndex || wIndex > ports)
721 1 : goto error;
722 1 : wIndex--;
723 :
724 : switch (wValue) {
725 3 : case USB_PORT_FEAT_ENABLE:
726 1 : temp = RH_PS_CCS;
727 1 : break;
728 4 : case USB_PORT_FEAT_C_ENABLE:
729 1 : temp = RH_PS_PESC;
730 1 : break;
731 4 : case USB_PORT_FEAT_SUSPEND:
732 1 : temp = RH_PS_POCI;
733 1 : break;
734 4 : case USB_PORT_FEAT_C_SUSPEND:
735 1 : temp = RH_PS_PSSC;
736 1 : break;
737 4 : case USB_PORT_FEAT_POWER:
738 1 : temp = RH_PS_LSDA;
739 1 : break;
740 4 : case USB_PORT_FEAT_C_CONNECTION:
741 1 : temp = RH_PS_CSC;
742 1 : break;
743 4 : case USB_PORT_FEAT_C_OVER_CURRENT:
744 1 : temp = RH_PS_OCIC;
745 1 : break;
746 4 : case USB_PORT_FEAT_C_RESET:
747 1 : temp = RH_PS_PRSC;
748 1 : break;
749 2 : default:
750 2 : goto error;
751 : }
752 2 : ohci_writel (ohci, temp,
753 : &ohci->regs->roothub.portstatus [wIndex]);
754 : // ohci_readl (ohci, &ohci->regs->roothub.portstatus [wIndex]);
755 1 : break;
756 4 : case GetHubDescriptor:
757 2 : ohci_hub_descriptor (ohci, (struct usb_hub_descriptor *) buf);
758 1 : break;
759 4 : case GetHubStatus:
760 3 : temp = roothub_status (ohci) & ~(RH_HS_CRWE | RH_HS_DRWE);
761 2 : put_unaligned_le32(temp, buf);
762 1 : break;
763 4 : case GetPortStatus:
764 4 : if (!wIndex || wIndex > ports)
765 1 : goto error;
766 1 : wIndex--;
767 4 : temp = roothub_portstatus (ohci, wIndex);
768 2 : put_unaligned_le32(temp, buf);
769 :
770 : #ifndef OHCI_VERBOSE_DEBUG
771 : if (*(u16*)(buf+2)) /* only if wPortChange is interesting */
772 : #endif
773 : dbg_port (ohci, "GetStatus", wIndex, temp);
774 1 : break;
775 4 : case SetHubFeature:
776 : switch (wValue) {
777 3 : case C_HUB_OVER_CURRENT:
778 : // FIXME: this can be cleared, yes?
779 3 : case C_HUB_LOCAL_POWER:
780 1 : break;
781 2 : default:
782 2 : goto error;
783 1 : }
784 1 : break;
785 4 : case SetPortFeature:
786 4 : if (!wIndex || wIndex > ports)
787 1 : goto error;
788 1 : wIndex--;
789 : switch (wValue) {
790 3 : case USB_PORT_FEAT_SUSPEND:
791 : #ifdef CONFIG_USB_OTG
792 : if (hcd->self.otg_port == (wIndex + 1)
793 : && hcd->self.b_hnp_enable)
794 : ohci->start_hnp(ohci);
795 : else
796 : #endif
797 2 : ohci_writel (ohci, RH_PS_PSS,
798 : &ohci->regs->roothub.portstatus [wIndex]);
799 1 : break;
800 4 : case USB_PORT_FEAT_POWER:
801 2 : ohci_writel (ohci, RH_PS_PPS,
802 : &ohci->regs->roothub.portstatus [wIndex]);
803 1 : break;
804 4 : case USB_PORT_FEAT_RESET:
805 4 : retval = root_port_reset (ohci, wIndex);
806 1 : break;
807 2 : default:
808 2 : goto error;
809 : }
810 3 : break;
811 1 :
812 2 : default:
813 1 : error:
814 : /* "protocol stall" on error */
815 1 : retval = -EPIPE;
816 1 : }
817 9 : return retval;
818 1 : }
819 :
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