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Merge tag 'v3.10.90' into update
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / usb / host / ohci-hub.c
CommitLineData
1da177e4
LT		 1/*
2 * OHCI HCD (Host Controller Driver) for USB.
dd9048af 3 *
1da177e4
LT		 4 * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
5 * (C) Copyright 2000-2004 David Brownell <dbrownell@users.sourceforge.net>
dd9048af 6 *
1da177e4
LT		 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" : "", \
dd9048af 26 \
1da177e4
LT		 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" : "", \
dd9048af 32 \
1da177e4
LT		 33 (temp & RH_PS_PES) ? " PES" : "", \
34 (temp & RH_PS_CCS) ? " CCS" : "" \
35 );
36
37/*-------------------------------------------------------------------------*/
38
1da177e4
LT		 39#define OHCI_SCHED_ENABLES \
40 (OHCI_CTRL_CLE|OHCI_CTRL_BLE|OHCI_CTRL_PLE|OHCI_CTRL_IE)
41
7d12e780
DH		 42static void dl_done_list (struct ohci_hcd *);
43static void finish_unlinks (struct ohci_hcd *, u16);
1da177e4 44
b1878440 45#ifdef CONFIG_PM
8d1a243b
AS		 46static int ohci_rh_suspend (struct ohci_hcd *ohci, int autostop)
47__releases(ohci->lock)
48__acquires(ohci->lock)
1da177e4 49{
1da177e4 50 int status = 0;
8de98402 51
1da177e4
LT		 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:
8d1a243b
AS		 66 if (!ohci->autostop) {
67 ohci_dbg (ohci, "already suspended\n");
68 goto done;
69 }
1da177e4 70 }
8d1a243b
AS		 71 ohci_dbg (ohci, "%s root hub\n",
72 autostop ? "auto-stop" : "suspend");
1da177e4
LT		 73
74 /* First stop any processing */
8d1a243b 75 if (!autostop && (ohci->hc_control & OHCI_SCHED_ENABLES)) {
1da177e4
LT		 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");
8d1a243b
AS		 85 ohci->autostop = 0;
86 spin_unlock_irq (&ohci->lock);
87 msleep (8);
88 spin_lock_irq (&ohci->lock);
1da177e4 89 }
7d12e780
DH		 90 dl_done_list (ohci);
91 finish_unlinks (ohci, ohci_frame_no(ohci));
1da177e4 92
dee03770
AS		 93 /*
94 * Some controllers don't handle "global" suspend properly if
95 * there are unsuspended ports. For these controllers, put all
96 * the enabled ports into suspend before suspending the root hub.
97 */
98 if (ohci->flags & OHCI_QUIRK_GLOBAL_SUSPEND) {
99 __hc32 __iomem *portstat = ohci->regs->roothub.portstatus;
100 int i;
101 unsigned temp;
102
103 for (i = 0; i < ohci->num_ports; (++i, ++portstat)) {
104 temp = ohci_readl(ohci, portstat);
105 if ((temp & (RH_PS_PES | RH_PS_PSS)) ==
106 RH_PS_PES)
107 ohci_writel(ohci, RH_PS_PSS, portstat);
108 }
109 }
110
1da177e4 111 /* maybe resume can wake root hub */
58a97ffe 112 if (ohci_to_hcd(ohci)->self.root_hub->do_remote_wakeup || autostop) {
1da177e4 113 ohci->hc_control |= OHCI_CTRL_RWE;
58a97ffe 114 } else {
5f47493c
AS		 115 ohci_writel(ohci, OHCI_INTR_RHSC | OHCI_INTR_RD,
116 &ohci->regs->intrdisable);
1da177e4 117 ohci->hc_control &= ~OHCI_CTRL_RWE;
1f7e1a3b 118 }
1da177e4 119
f197b2c5
DB		 120 /* Suspend hub ... this is the "global (to this bus) suspend" mode,
121 * which doesn't imply ports will first be individually suspended.
122 */
1da177e4
LT		 123 ohci->hc_control &= ~OHCI_CTRL_HCFS;
124 ohci->hc_control |= OHCI_USB_SUSPEND;
125 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
126 (void) ohci_readl (ohci, &ohci->regs->control);
127
128 /* no resumes until devices finish suspending */
8d1a243b
AS		 129 if (!autostop) {
130 ohci->next_statechange = jiffies + msecs_to_jiffies (5);
131 ohci->autostop = 0;
b7463c71 132 ohci->rh_state = OHCI_RH_SUSPENDED;
8d1a243b 133 }
d413984a 134
1da177e4 135done:
1da177e4
LT		 136 return status;
137}
138
139static inline struct ed *find_head (struct ed *ed)
140{
141 /* for bulk and control lists */
142 while (ed->ed_prev)
143 ed = ed->ed_prev;
144 return ed;
145}
146
147/* caller has locked the root hub */
8d1a243b
AS		 148static int ohci_rh_resume (struct ohci_hcd *ohci)
149__releases(ohci->lock)
150__acquires(ohci->lock)
1da177e4 151{
8d1a243b 152 struct usb_hcd *hcd = ohci_to_hcd (ohci);
1da177e4
LT		 153 u32 temp, enables;
154 int status = -EINPROGRESS;
8d1a243b 155 int autostopped = ohci->autostop;
8de98402 156
8d1a243b 157 ohci->autostop = 0;
1da177e4
LT		 158 ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
159
160 if (ohci->hc_control & (OHCI_CTRL_IR | OHCI_SCHED_ENABLES)) {
f197b2c5 161 /* this can happen after resuming a swsusp snapshot */
b7463c71 162 if (ohci->rh_state != OHCI_RH_RUNNING) {
1da177e4
LT		 163 ohci_dbg (ohci, "BIOS/SMM active, control %03x\n",
164 ohci->hc_control);
165 status = -EBUSY;
166 /* this happens when pmcore resumes HC then root */
167 } else {
168 ohci_dbg (ohci, "duplicate resume\n");
169 status = 0;
170 }
171 } else switch (ohci->hc_control & OHCI_CTRL_HCFS) {
172 case OHCI_USB_SUSPEND:
173 ohci->hc_control &= ~(OHCI_CTRL_HCFS|OHCI_SCHED_ENABLES);
174 ohci->hc_control |= OHCI_USB_RESUME;
175 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
176 (void) ohci_readl (ohci, &ohci->regs->control);
8d1a243b
AS		 177 ohci_dbg (ohci, "%s root hub\n",
178 autostopped ? "auto-start" : "resume");
1da177e4
LT		 179 break;
180 case OHCI_USB_RESUME:
181 /* HCFS changes sometime after INTR_RD */
1b7be3c0 182 ohci_dbg(ohci, "%swakeup root hub\n",
583ceada 183 autostopped ? "auto-" : "");
1da177e4
LT		 184 break;
185 case OHCI_USB_OPER:
f197b2c5
DB		 186 /* this can happen after resuming a swsusp snapshot */
187 ohci_dbg (ohci, "snapshot resume? reinit\n");
188 status = -EBUSY;
1da177e4
LT		 189 break;
190 default: /* RESET, we lost power */
f197b2c5 191 ohci_dbg (ohci, "lost power\n");
1da177e4
LT		 192 status = -EBUSY;
193 }
1da177e4 194 if (status == -EBUSY) {
8d1a243b 195 if (!autostopped) {
8d1a243b
AS		 196 spin_unlock_irq (&ohci->lock);
197 (void) ohci_init (ohci);
198 status = ohci_restart (ohci);
d576bb9f
MH		 199
200 usb_root_hub_lost_power(hcd->self.root_hub);
201
8d1a243b
AS		 202 spin_lock_irq (&ohci->lock);
203 }
204 return status;
1da177e4
LT		 205 }
206 if (status != -EINPROGRESS)
207 return status;
8d1a243b
AS		 208 if (autostopped)
209 goto skip_resume;
210 spin_unlock_irq (&ohci->lock);
1da177e4 211
1da177e4 212 /* Some controllers (lucent erratum) need extra-long delays */
f197b2c5 213 msleep (20 /* usb 11.5.1.10 */ + 12 /* 32 msec counter */ + 1);
1da177e4
LT		 214
215 temp = ohci_readl (ohci, &ohci->regs->control);
216 temp &= OHCI_CTRL_HCFS;
217 if (temp != OHCI_USB_RESUME) {
218 ohci_err (ohci, "controller won't resume\n");
565402ba 219 spin_lock_irq(&ohci->lock);
1da177e4
LT		 220 return -EBUSY;
221 }
222
223 /* disable old schedule state, reinit from scratch */
224 ohci_writel (ohci, 0, &ohci->regs->ed_controlhead);
225 ohci_writel (ohci, 0, &ohci->regs->ed_controlcurrent);
226 ohci_writel (ohci, 0, &ohci->regs->ed_bulkhead);
227 ohci_writel (ohci, 0, &ohci->regs->ed_bulkcurrent);
228 ohci_writel (ohci, 0, &ohci->regs->ed_periodcurrent);
229 ohci_writel (ohci, (u32) ohci->hcca_dma, &ohci->regs->hcca);
230
231 /* Sometimes PCI D3 suspend trashes frame timings ... */
232 periodic_reinit (ohci);
233
8d1a243b
AS		 234 /* the following code is executed with ohci->lock held and
235 * irqs disabled if and only if autostopped is true
236 */
237
238skip_resume:
1da177e4
LT		 239 /* interrupts might have been disabled */
240 ohci_writel (ohci, OHCI_INTR_INIT, &ohci->regs->intrenable);
241 if (ohci->ed_rm_list)
242 ohci_writel (ohci, OHCI_INTR_SF, &ohci->regs->intrenable);
1da177e4
LT		 243
244 /* Then re-enable operations */
245 ohci_writel (ohci, OHCI_USB_OPER, &ohci->regs->control);
246 (void) ohci_readl (ohci, &ohci->regs->control);
8d1a243b
AS		 247 if (!autostopped)
248 msleep (3);
1da177e4 249
6a9062f3
DB		 250 temp = ohci->hc_control;
251 temp &= OHCI_CTRL_RWC;
252 temp |= OHCI_CONTROL_INIT | OHCI_USB_OPER;
1da177e4
LT		 253 ohci->hc_control = temp;
254 ohci_writel (ohci, temp, &ohci->regs->control);
255 (void) ohci_readl (ohci, &ohci->regs->control);
256
257 /* TRSMRCY */
8d1a243b
AS		 258 if (!autostopped) {
259 msleep (10);
260 spin_lock_irq (&ohci->lock);
261 }
262 /* now ohci->lock is always held and irqs are always disabled */
1da177e4 263
d413984a
DB		 264 /* keep it alive for more than ~5x suspend + resume costs */
265 ohci->next_statechange = jiffies + STATECHANGE_DELAY;
1da177e4
LT		 266
267 /* maybe turn schedules back on */
268 enables = 0;
269 temp = 0;
270 if (!ohci->ed_rm_list) {
271 if (ohci->ed_controltail) {
272 ohci_writel (ohci,
273 find_head (ohci->ed_controltail)->dma,
274 &ohci->regs->ed_controlhead);
275 enables |= OHCI_CTRL_CLE;
276 temp |= OHCI_CLF;
277 }
278 if (ohci->ed_bulktail) {
279 ohci_writel (ohci, find_head (ohci->ed_bulktail)->dma,
280 &ohci->regs->ed_bulkhead);
281 enables |= OHCI_CTRL_BLE;
282 temp |= OHCI_BLF;
283 }
284 }
285 if (hcd->self.bandwidth_isoc_reqs || hcd->self.bandwidth_int_reqs)
286 enables |= OHCI_CTRL_PLE|OHCI_CTRL_IE;
287 if (enables) {
288 ohci_dbg (ohci, "restarting schedules ... %08x\n", enables);
289 ohci->hc_control |= enables;
290 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
291 if (temp)
292 ohci_writel (ohci, temp, &ohci->regs->cmdstatus);
293 (void) ohci_readl (ohci, &ohci->regs->control);
294 }
295
b7463c71 296 ohci->rh_state = OHCI_RH_RUNNING;
1da177e4
LT		 297 return 0;
298}
299
8d1a243b
AS		 300static int ohci_bus_suspend (struct usb_hcd *hcd)
301{
302 struct ohci_hcd *ohci = hcd_to_ohci (hcd);
303 int rc;
304
305 spin_lock_irq (&ohci->lock);
306
541c7d43 307 if (unlikely(!HCD_HW_ACCESSIBLE(hcd)))
8d1a243b
AS		 308 rc = -ESHUTDOWN;
309 else
310 rc = ohci_rh_suspend (ohci, 0);
311 spin_unlock_irq (&ohci->lock);
312 return rc;
313}
314
315static int ohci_bus_resume (struct usb_hcd *hcd)
316{
317 struct ohci_hcd *ohci = hcd_to_ohci (hcd);
318 int rc;
319
320 if (time_before (jiffies, ohci->next_statechange))
321 msleep(5);
322
323 spin_lock_irq (&ohci->lock);
324
541c7d43 325 if (unlikely(!HCD_HW_ACCESSIBLE(hcd)))
8d1a243b
AS		 326 rc = -ESHUTDOWN;
327 else
328 rc = ohci_rh_resume (ohci);
329 spin_unlock_irq (&ohci->lock);
330
331 /* poll until we know a device is connected or we autostop */
332 if (rc == 0)
333 usb_hcd_poll_rh_status(hcd);
334 return rc;
335}
336
1f9fc882
AS		 337/* Carry out polling-, autostop-, and autoresume-related state changes */
338static int ohci_root_hub_state_changes(struct ohci_hcd *ohci, int changed,
71b7497c 339 int any_connected, int rhsc_status)
1f9fc882
AS		 340{
341 int poll_rh = 1;
71b7497c 342 int rhsc_enable;
1f9fc882 343
ee0b9be8 344 /* Some broken controllers never turn off RHSC in the interrupt
4a511bc3
AS		 345 * status register. For their sake we won't re-enable RHSC
346 * interrupts if the interrupt bit is already active.
347 */
4a511bc3
AS		 348 rhsc_enable = ohci_readl(ohci, &ohci->regs->intrenable) &
349 OHCI_INTR_RHSC;
1f9fc882 350
4a511bc3 351 switch (ohci->hc_control & OHCI_CTRL_HCFS) {
1f9fc882 352 case OHCI_USB_OPER:
4a511bc3
AS		 353 /* If no status changes are pending, enable RHSC interrupts. */
354 if (!rhsc_enable && !rhsc_status && !changed) {
355 rhsc_enable = OHCI_INTR_RHSC;
356 ohci_writel(ohci, rhsc_enable, &ohci->regs->intrenable);
b5fb454f
AS		 357 }
358
359 /* Keep on polling until we know a device is connected
360 * and RHSC is enabled, or until we autostop.
361 */
1f9fc882
AS		 362 if (!ohci->autostop) {
363 if (any_connected ||
364 !device_may_wakeup(&ohci_to_hcd(ohci)
365 ->self.root_hub->dev)) {
4a511bc3 366 if (rhsc_enable)
1f9fc882
AS		 367 poll_rh = 0;
368 } else {
369 ohci->autostop = 1;
370 ohci->next_statechange = jiffies + HZ;
371 }
372
373 /* if no devices have been attached for one second, autostop */
374 } else {
375 if (changed || any_connected) {
376 ohci->autostop = 0;
377 ohci->next_statechange = jiffies +
378 STATECHANGE_DELAY;
4a511bc3 379 } else if (time_after_eq(jiffies,
1f9fc882
AS		 380 ohci->next_statechange)
381 && !ohci->ed_rm_list
382 && !(ohci->hc_control &
383 OHCI_SCHED_ENABLES)) {
384 ohci_rh_suspend(ohci, 1);
4a511bc3
AS		 385 if (rhsc_enable)
386 poll_rh = 0;
1f9fc882
AS		 387 }
388 }
389 break;
390
1f9fc882
AS		 391 case OHCI_USB_SUSPEND:
392 case OHCI_USB_RESUME:
4a511bc3 393 /* if there is a port change, autostart or ask to be resumed */
1f9fc882
AS		 394 if (changed) {
395 if (ohci->autostop)
396 ohci_rh_resume(ohci);
397 else
398 usb_hcd_resume_root_hub(ohci_to_hcd(ohci));
71b7497c
AS		 399
400 /* If remote wakeup is disabled, stop polling */
401 } else if (!ohci->autostop &&
402 !ohci_to_hcd(ohci)->self.root_hub->
403 do_remote_wakeup) {
404 poll_rh = 0;
405
1f9fc882 406 } else {
71b7497c
AS		 407 /* If no status changes are pending,
408 * enable RHSC interrupts
409 */
410 if (!rhsc_enable && !rhsc_status) {
4a511bc3
AS		 411 rhsc_enable = OHCI_INTR_RHSC;
412 ohci_writel(ohci, rhsc_enable,
b5fb454f 413 &ohci->regs->intrenable);
4a511bc3 414 }
71b7497c 415 /* Keep polling until RHSC is enabled */
4a511bc3
AS		 416 if (rhsc_enable)
417 poll_rh = 0;
1f9fc882
AS		 418 }
419 break;
420 }
421 return poll_rh;
422}
423
424#else /* CONFIG_PM */
425
426static inline int ohci_rh_resume(struct ohci_hcd *ohci)
427{
428 return 0;
429}
430
431/* Carry out polling-related state changes.
432 * autostop isn't used when CONFIG_PM is turned off.
433 */
434static int ohci_root_hub_state_changes(struct ohci_hcd *ohci, int changed,
71b7497c 435 int any_connected, int rhsc_status)
1f9fc882 436{
b5fb454f 437 /* If RHSC is enabled, don't poll */
09ca8adb 438 if (ohci_readl(ohci, &ohci->regs->intrenable) & OHCI_INTR_RHSC)
b5fb454f
AS		 439 return 0;
440
71b7497c
AS		 441 /* If status changes are pending, continue polling.
442 * Conversely, if no status changes are pending but the RHSC
443 * status bit was set, then RHSC may be broken so continue polling.
444 */
445 if (changed || rhsc_status)
446 return 1;
447
448 /* It's safe to re-enable RHSC interrupts */
449 ohci_writel(ohci, OHCI_INTR_RHSC, &ohci->regs->intrenable);
450 return 0;
1f9fc882
AS		 451}
452
8ad7fe16 453#endif /* CONFIG_PM */
1da177e4
LT		 454
455/*-------------------------------------------------------------------------*/
456
457/* build "status change" packet (one or two bytes) from HC registers */
458
459static int
460ohci_hub_status_data (struct usb_hcd *hcd, char *buf)
461{
462 struct ohci_hcd *ohci = hcd_to_ohci (hcd);
fdd13b36 463 int i, changed = 0, length = 1;
052ac01a 464 int any_connected = 0;
71b7497c 465 int rhsc_status;
1da177e4
LT		 466 unsigned long flags;
467
468 spin_lock_irqsave (&ohci->lock, flags);
541c7d43 469 if (!HCD_HW_ACCESSIBLE(hcd))
6fd75b19 470 goto done;
1da177e4 471
fdd13b36
DB		 472 /* undocumented erratum seen on at least rev D */
473 if ((ohci->flags & OHCI_QUIRK_AMD756)
474 && (roothub_a (ohci) & RH_A_NDP) > MAX_ROOT_PORTS) {
475 ohci_warn (ohci, "bogus NDP, rereads as NDP=%d\n",
1da177e4
LT		 476 ohci_readl (ohci, &ohci->regs->roothub.a) & RH_A_NDP);
477 /* retry later; "should not happen" */
478 goto done;
479 }
480
481 /* init status */
482 if (roothub_status (ohci) & (RH_HS_LPSC | RH_HS_OCIC))
483 buf [0] = changed = 1;
484 else
485 buf [0] = 0;
fdd13b36 486 if (ohci->num_ports > 7) {
1da177e4
LT		 487 buf [1] = 0;
488 length++;
489 }
490
71b7497c
AS		 491 /* Clear the RHSC status flag before reading the port statuses */
492 ohci_writel(ohci, OHCI_INTR_RHSC, &ohci->regs->intrstatus);
493 rhsc_status = ohci_readl(ohci, &ohci->regs->intrstatus) &
494 OHCI_INTR_RHSC;
495
1da177e4 496 /* look at each port */
fdd13b36 497 for (i = 0; i < ohci->num_ports; i++) {
1da177e4
LT		 498 u32 status = roothub_portstatus (ohci, i);
499
8d1a243b
AS		 500 /* can't autostop if ports are connected */
501 any_connected |= (status & RH_PS_CCS);
502
1da177e4
LT		 503 if (status & (RH_PS_CSC | RH_PS_PESC | RH_PS_PSSC
504 | RH_PS_OCIC | RH_PS_PRSC)) {
505 changed = 1;
506 if (i < 7)
507 buf [0] |= 1 << (i + 1);
508 else
509 buf [1] |= 1 << (i - 7);
1da177e4 510 }
d413984a 511 }
1da177e4 512
541c7d43
AS		 513 if (ohci_root_hub_state_changes(ohci, changed,
514 any_connected, rhsc_status))
515 set_bit(HCD_FLAG_POLL_RH, &hcd->flags);
516 else
517 clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
518
d413984a 519
1da177e4
LT		 520done:
521 spin_unlock_irqrestore (&ohci->lock, flags);
522
1da177e4
LT		 523 return changed ? length : 0;
524}
525
526/*-------------------------------------------------------------------------*/
527
528static void
529ohci_hub_descriptor (
530 struct ohci_hcd *ohci,
531 struct usb_hub_descriptor *desc
532) {
533 u32 rh = roothub_a (ohci);
1da177e4
LT		 534 u16 temp;
535
536 desc->bDescriptorType = 0x29;
537 desc->bPwrOn2PwrGood = (rh & RH_A_POTPGT) >> 24;
538 desc->bHubContrCurrent = 0;
539
fdd13b36
DB		 540 desc->bNbrPorts = ohci->num_ports;
541 temp = 1 + (ohci->num_ports / 8);
1da177e4
LT		 542 desc->bDescLength = 7 + 2 * temp;
543
544 temp = 0;
545 if (rh & RH_A_NPS) /* no power switching? */
546 temp |= 0x0002;
dd9048af 547 if (rh & RH_A_PSM) /* per-port power switching? */
1da177e4
LT		 548 temp |= 0x0001;
549 if (rh & RH_A_NOCP) /* no overcurrent reporting? */
550 temp |= 0x0010;
551 else if (rh & RH_A_OCPM) /* per-port overcurrent reporting? */
552 temp |= 0x0008;
553 desc->wHubCharacteristics = (__force __u16)cpu_to_hc16(ohci, temp);
554
da13051c 555 /* ports removable, and usb 1.0 legacy PortPwrCtrlMask */
1da177e4 556 rh = roothub_b (ohci);
dbe79bbe
JY		 557 memset(desc->u.hs.DeviceRemovable, 0xff,
558 sizeof(desc->u.hs.DeviceRemovable));
559 desc->u.hs.DeviceRemovable[0] = rh & RH_B_DR;
fdd13b36 560 if (ohci->num_ports > 7) {
dbe79bbe
JY		 561 desc->u.hs.DeviceRemovable[1] = (rh & RH_B_DR) >> 8;
562 desc->u.hs.DeviceRemovable[2] = 0xff;
1da177e4 563 } else
dbe79bbe 564 desc->u.hs.DeviceRemovable[1] = 0xff;
1da177e4
LT		 565}
566
567/*-------------------------------------------------------------------------*/
568
569#ifdef CONFIG_USB_OTG
570
571static int ohci_start_port_reset (struct usb_hcd *hcd, unsigned port)
572{
573 struct ohci_hcd *ohci = hcd_to_ohci (hcd);
574 u32 status;
575
576 if (!port)
577 return -EINVAL;
578 port--;
579
580 /* start port reset before HNP protocol times out */
581 status = ohci_readl(ohci, &ohci->regs->roothub.portstatus [port]);
582 if (!(status & RH_PS_CCS))
583 return -ENODEV;
584
585 /* khubd will finish the reset later */
586 ohci_writel(ohci, RH_PS_PRS, &ohci->regs->roothub.portstatus [port]);
587 return 0;
588}
589
1da177e4
LT		 590#else
591
592#define ohci_start_port_reset NULL
593
594#endif
595
596/*-------------------------------------------------------------------------*/
597
598
599/* See usb 7.1.7.5: root hubs must issue at least 50 msec reset signaling,
600 * not necessarily continuous ... to guard against resume signaling.
1da177e4 601 */
1da177e4 602#define PORT_RESET_MSEC 50
1da177e4
LT		 603
604/* this timer value might be vendor-specific ... */
605#define PORT_RESET_HW_MSEC 10
606
607/* wrap-aware logic morphed from <linux/jiffies.h> */
608#define tick_before(t1,t2) ((s16)(((s16)(t1))-((s16)(t2))) < 0)
609
610/* called from some task, normally khubd */
23d10a9e 611static inline int root_port_reset (struct ohci_hcd *ohci, unsigned port)
1da177e4
LT		 612{
613 __hc32 __iomem *portstat = &ohci->regs->roothub.portstatus [port];
1b7b61c5 614 u32 temp = 0;
1da177e4
LT		 615 u16 now = ohci_readl(ohci, &ohci->regs->fmnumber);
616 u16 reset_done = now + PORT_RESET_MSEC;
e01e7fe3 617 int limit_1 = DIV_ROUND_UP(PORT_RESET_MSEC, PORT_RESET_HW_MSEC);
1da177e4
LT		 618
619 /* build a "continuous enough" reset signal, with up to
620 * 3msec gap between pulses. scheduler HZ==100 must work;
621 * this might need to be deadline-scheduled.
622 */
623 do {
e01e7fe3
DB		 624 int limit_2;
625
1da177e4 626 /* spin until any current reset finishes */
e01e7fe3
DB		 627 limit_2 = PORT_RESET_HW_MSEC * 2;
628 while (--limit_2 >= 0) {
1da177e4 629 temp = ohci_readl (ohci, portstat);
23d10a9e
TO		 630 /* handle e.g. CardBus eject */
631 if (temp == ~(u32)0)
632 return -ESHUTDOWN;
1da177e4
LT		 633 if (!(temp & RH_PS_PRS))
634 break;
635 udelay (500);
dd9048af 636 }
1da177e4 637
e01e7fe3
DB		 638 /* timeout (a hardware error) has been observed when
639 * EHCI sets CF while this driver is resetting a port;
640 * presumably other disconnect paths might do it too.
641 */
642 if (limit_2 < 0) {
643 ohci_dbg(ohci,
644 "port[%d] reset timeout, stat %08x\n",
645 port, temp);
646 break;
647 }
648
1da177e4
LT		 649 if (!(temp & RH_PS_CCS))
650 break;
651 if (temp & RH_PS_PRSC)
652 ohci_writel (ohci, RH_PS_PRSC, portstat);
653
654 /* start the next reset, sleep till it's probably done */
655 ohci_writel (ohci, RH_PS_PRS, portstat);
656 msleep(PORT_RESET_HW_MSEC);
657 now = ohci_readl(ohci, &ohci->regs->fmnumber);
e01e7fe3
DB		 658 } while (tick_before(now, reset_done) && --limit_1 >= 0);
659
660 /* caller synchronizes using PRSC ... and handles PRS
661 * still being set when this returns.
662 */
23d10a9e
TO		 663
664 return 0;
1da177e4
LT		 665}
666
667static int ohci_hub_control (
668 struct usb_hcd *hcd,
669 u16 typeReq,
670 u16 wValue,
671 u16 wIndex,
672 char *buf,
673 u16 wLength
674) {
675 struct ohci_hcd *ohci = hcd_to_ohci (hcd);
fcf7d214 676 int ports = ohci->num_ports;
1da177e4
LT		 677 u32 temp;
678 int retval = 0;
679
541c7d43 680 if (unlikely(!HCD_HW_ACCESSIBLE(hcd)))
8de98402
BH		 681 return -ESHUTDOWN;
682
1da177e4
LT		 683 switch (typeReq) {
684 case ClearHubFeature:
685 switch (wValue) {
686 case C_HUB_OVER_CURRENT:
687 ohci_writel (ohci, RH_HS_OCIC,
688 &ohci->regs->roothub.status);
689 case C_HUB_LOCAL_POWER:
690 break;
691 default:
692 goto error;
693 }
694 break;
695 case ClearPortFeature:
696 if (!wIndex || wIndex > ports)
697 goto error;
698 wIndex--;
699
700 switch (wValue) {
701 case USB_PORT_FEAT_ENABLE:
702 temp = RH_PS_CCS;
703 break;
704 case USB_PORT_FEAT_C_ENABLE:
705 temp = RH_PS_PESC;
706 break;
707 case USB_PORT_FEAT_SUSPEND:
708 temp = RH_PS_POCI;
1da177e4
LT		 709 break;
710 case USB_PORT_FEAT_C_SUSPEND:
711 temp = RH_PS_PSSC;
712 break;
713 case USB_PORT_FEAT_POWER:
714 temp = RH_PS_LSDA;
715 break;
716 case USB_PORT_FEAT_C_CONNECTION:
717 temp = RH_PS_CSC;
718 break;
719 case USB_PORT_FEAT_C_OVER_CURRENT:
720 temp = RH_PS_OCIC;
721 break;
722 case USB_PORT_FEAT_C_RESET:
723 temp = RH_PS_PRSC;
724 break;
725 default:
726 goto error;
727 }
728 ohci_writel (ohci, temp,
729 &ohci->regs->roothub.portstatus [wIndex]);
730 // ohci_readl (ohci, &ohci->regs->roothub.portstatus [wIndex]);
731 break;
732 case GetHubDescriptor:
733 ohci_hub_descriptor (ohci, (struct usb_hub_descriptor *) buf);
734 break;
735 case GetHubStatus:
736 temp = roothub_status (ohci) & ~(RH_HS_CRWE | RH_HS_DRWE);
a5abdeaf 737 put_unaligned_le32(temp, buf);
1da177e4
LT		 738 break;
739 case GetPortStatus:
740 if (!wIndex || wIndex > ports)
741 goto error;
742 wIndex--;
743 temp = roothub_portstatus (ohci, wIndex);
a5abdeaf 744 put_unaligned_le32(temp, buf);
1da177e4
LT		 745
746#ifndef OHCI_VERBOSE_DEBUG
747 if (*(u16*)(buf+2)) /* only if wPortChange is interesting */
748#endif
749 dbg_port (ohci, "GetStatus", wIndex, temp);
750 break;
751 case SetHubFeature:
752 switch (wValue) {
753 case C_HUB_OVER_CURRENT:
754 // FIXME: this can be cleared, yes?
755 case C_HUB_LOCAL_POWER:
756 break;
757 default:
758 goto error;
759 }
760 break;
761 case SetPortFeature:
762 if (!wIndex || wIndex > ports)
763 goto error;
764 wIndex--;
765 switch (wValue) {
766 case USB_PORT_FEAT_SUSPEND:
767#ifdef CONFIG_USB_OTG
768 if (hcd->self.otg_port == (wIndex + 1)
769 && hcd->self.b_hnp_enable)
e8b24450 770 ohci->start_hnp(ohci);
1da177e4
LT		 771 else
772#endif
773 ohci_writel (ohci, RH_PS_PSS,
774 &ohci->regs->roothub.portstatus [wIndex]);
775 break;
776 case USB_PORT_FEAT_POWER:
777 ohci_writel (ohci, RH_PS_PPS,
778 &ohci->regs->roothub.portstatus [wIndex]);
779 break;
780 case USB_PORT_FEAT_RESET:
23d10a9e 781 retval = root_port_reset (ohci, wIndex);
1da177e4
LT		 782 break;
783 default:
784 goto error;
785 }
786 break;
787
788 default:
789error:
790 /* "protocol stall" on error */
791 retval = -EPIPE;
792 }
793 return retval;
794}
795
kernel source for telekom puls (alcatel/mediatek)