1 | // SPDX-License-Identifier: GPL-1.0+ |
2 | /* |
3 | * OHCI HCD (Host Controller Driver) for USB. |
4 | * |
5 | * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at> |
6 | * (C) Copyright 2000-2004 David Brownell <dbrownell@users.sourceforge.net> |
7 | * |
8 | * This file is licenced under GPL |
9 | */ |
10 | |
11 | /*-------------------------------------------------------------------------*/ |
12 | |
13 | /* |
14 | * OHCI Root Hub ... the nonsharable stuff |
15 | */ |
16 | |
17 | #define dbg_port(hc,label,num,value) \ |
18 | ohci_dbg (hc, \ |
19 | "%s roothub.portstatus [%d] " \ |
20 | "= 0x%08x%s%s%s%s%s%s%s%s%s%s%s%s\n", \ |
21 | label, num, value, \ |
22 | (value & RH_PS_PRSC) ? " PRSC" : "", \ |
23 | (value & RH_PS_OCIC) ? " OCIC" : "", \ |
24 | (value & RH_PS_PSSC) ? " PSSC" : "", \ |
25 | (value & RH_PS_PESC) ? " PESC" : "", \ |
26 | (value & RH_PS_CSC) ? " CSC" : "", \ |
27 | \ |
28 | (value & RH_PS_LSDA) ? " LSDA" : "", \ |
29 | (value & RH_PS_PPS) ? " PPS" : "", \ |
30 | (value & RH_PS_PRS) ? " PRS" : "", \ |
31 | (value & RH_PS_POCI) ? " POCI" : "", \ |
32 | (value & RH_PS_PSS) ? " PSS" : "", \ |
33 | \ |
34 | (value & RH_PS_PES) ? " PES" : "", \ |
35 | (value & RH_PS_CCS) ? " CCS" : "" \ |
36 | ); |
37 | |
38 | /*-------------------------------------------------------------------------*/ |
39 | |
40 | #define OHCI_SCHED_ENABLES \ |
41 | (OHCI_CTRL_CLE|OHCI_CTRL_BLE|OHCI_CTRL_PLE|OHCI_CTRL_IE) |
42 | |
43 | static void update_done_list(struct ohci_hcd *); |
44 | static void ohci_work(struct ohci_hcd *); |
45 | |
46 | #ifdef CONFIG_PM |
47 | static int ohci_rh_suspend (struct ohci_hcd *ohci, int autostop) |
48 | __releases(ohci->lock) |
49 | __acquires(ohci->lock) |
50 | { |
51 | int status = 0; |
52 | |
53 | ohci->hc_control = ohci_readl (ohci, &ohci->regs->control); |
54 | switch (ohci->hc_control & OHCI_CTRL_HCFS) { |
55 | case OHCI_USB_RESUME: |
56 | ohci_dbg (ohci, "resume/suspend?\n" ); |
57 | ohci->hc_control &= ~OHCI_CTRL_HCFS; |
58 | ohci->hc_control |= OHCI_USB_RESET; |
59 | ohci_writel (ohci, ohci->hc_control, &ohci->regs->control); |
60 | (void) ohci_readl (ohci, &ohci->regs->control); |
61 | fallthrough; |
62 | case OHCI_USB_RESET: |
63 | status = -EBUSY; |
64 | ohci_dbg (ohci, "needs reinit!\n" ); |
65 | goto done; |
66 | case OHCI_USB_SUSPEND: |
67 | if (!ohci->autostop) { |
68 | ohci_dbg (ohci, "already suspended\n" ); |
69 | goto done; |
70 | } |
71 | } |
72 | ohci_dbg (ohci, "%s root hub\n" , |
73 | autostop ? "auto-stop" : "suspend" ); |
74 | |
75 | /* First stop any processing */ |
76 | if (!autostop && (ohci->hc_control & OHCI_SCHED_ENABLES)) { |
77 | ohci->hc_control &= ~OHCI_SCHED_ENABLES; |
78 | ohci_writel (ohci, ohci->hc_control, &ohci->regs->control); |
79 | ohci->hc_control = ohci_readl (ohci, &ohci->regs->control); |
80 | ohci_writel (ohci, OHCI_INTR_SF, &ohci->regs->intrstatus); |
81 | |
82 | /* sched disables take effect on the next frame, |
83 | * then the last WDH could take 6+ msec |
84 | */ |
85 | ohci_dbg (ohci, "stopping schedules ...\n" ); |
86 | ohci->autostop = 0; |
87 | spin_unlock_irq (lock: &ohci->lock); |
88 | msleep (msecs: 8); |
89 | spin_lock_irq (lock: &ohci->lock); |
90 | } |
91 | update_done_list(ohci); |
92 | ohci_work(ohci); |
93 | |
94 | /* All ED unlinks should be finished, no need for SOF interrupts */ |
95 | ohci_writel(ohci, OHCI_INTR_SF, &ohci->regs->intrdisable); |
96 | |
97 | /* |
98 | * Some controllers don't handle "global" suspend properly if |
99 | * there are unsuspended ports. For these controllers, put all |
100 | * the enabled ports into suspend before suspending the root hub. |
101 | */ |
102 | if (ohci->flags & OHCI_QUIRK_GLOBAL_SUSPEND) { |
103 | __hc32 __iomem *portstat = ohci->regs->roothub.portstatus; |
104 | int i; |
105 | unsigned temp; |
106 | |
107 | for (i = 0; i < ohci->num_ports; (++i, ++portstat)) { |
108 | temp = ohci_readl(ohci, portstat); |
109 | if ((temp & (RH_PS_PES | RH_PS_PSS)) == |
110 | RH_PS_PES) |
111 | ohci_writel(ohci, RH_PS_PSS, portstat); |
112 | } |
113 | } |
114 | |
115 | /* maybe resume can wake root hub */ |
116 | if (ohci_to_hcd(ohci)->self.root_hub->do_remote_wakeup || autostop) { |
117 | ohci->hc_control |= OHCI_CTRL_RWE; |
118 | } else { |
119 | ohci_writel(ohci, OHCI_INTR_RHSC | OHCI_INTR_RD, |
120 | &ohci->regs->intrdisable); |
121 | ohci->hc_control &= ~OHCI_CTRL_RWE; |
122 | } |
123 | |
124 | /* Suspend hub ... this is the "global (to this bus) suspend" mode, |
125 | * which doesn't imply ports will first be individually suspended. |
126 | */ |
127 | ohci->hc_control &= ~OHCI_CTRL_HCFS; |
128 | ohci->hc_control |= OHCI_USB_SUSPEND; |
129 | ohci_writel (ohci, ohci->hc_control, &ohci->regs->control); |
130 | (void) ohci_readl (ohci, &ohci->regs->control); |
131 | |
132 | /* no resumes until devices finish suspending */ |
133 | if (!autostop) { |
134 | ohci->next_statechange = jiffies + msecs_to_jiffies (m: 5); |
135 | ohci->autostop = 0; |
136 | ohci->rh_state = OHCI_RH_SUSPENDED; |
137 | } |
138 | |
139 | done: |
140 | return status; |
141 | } |
142 | |
143 | static inline struct ed *find_head (struct ed *ed) |
144 | { |
145 | /* for bulk and control lists */ |
146 | while (ed->ed_prev) |
147 | ed = ed->ed_prev; |
148 | return ed; |
149 | } |
150 | |
151 | /* caller has locked the root hub */ |
152 | static int ohci_rh_resume (struct ohci_hcd *ohci) |
153 | __releases(ohci->lock) |
154 | __acquires(ohci->lock) |
155 | { |
156 | struct usb_hcd *hcd = ohci_to_hcd (ohci); |
157 | u32 temp, enables; |
158 | int status = -EINPROGRESS; |
159 | int autostopped = ohci->autostop; |
160 | |
161 | ohci->autostop = 0; |
162 | ohci->hc_control = ohci_readl (ohci, &ohci->regs->control); |
163 | |
164 | if (ohci->hc_control & (OHCI_CTRL_IR | OHCI_SCHED_ENABLES)) { |
165 | /* this can happen after resuming a swsusp snapshot */ |
166 | if (ohci->rh_state != OHCI_RH_RUNNING) { |
167 | ohci_dbg (ohci, "BIOS/SMM active, control %03x\n" , |
168 | ohci->hc_control); |
169 | status = -EBUSY; |
170 | /* this happens when pmcore resumes HC then root */ |
171 | } else { |
172 | ohci_dbg (ohci, "duplicate resume\n" ); |
173 | status = 0; |
174 | } |
175 | } else switch (ohci->hc_control & OHCI_CTRL_HCFS) { |
176 | case OHCI_USB_SUSPEND: |
177 | ohci->hc_control &= ~(OHCI_CTRL_HCFS|OHCI_SCHED_ENABLES); |
178 | ohci->hc_control |= OHCI_USB_RESUME; |
179 | ohci_writel (ohci, ohci->hc_control, &ohci->regs->control); |
180 | (void) ohci_readl (ohci, &ohci->regs->control); |
181 | ohci_dbg (ohci, "%s root hub\n" , |
182 | autostopped ? "auto-start" : "resume" ); |
183 | break; |
184 | case OHCI_USB_RESUME: |
185 | /* HCFS changes sometime after INTR_RD */ |
186 | ohci_dbg(ohci, "%swakeup root hub\n" , |
187 | autostopped ? "auto-" : "" ); |
188 | break; |
189 | case OHCI_USB_OPER: |
190 | /* this can happen after resuming a swsusp snapshot */ |
191 | ohci_dbg (ohci, "snapshot resume? reinit\n" ); |
192 | status = -EBUSY; |
193 | break; |
194 | default: /* RESET, we lost power */ |
195 | ohci_dbg (ohci, "lost power\n" ); |
196 | status = -EBUSY; |
197 | } |
198 | if (status == -EBUSY) { |
199 | if (!autostopped) { |
200 | spin_unlock_irq (lock: &ohci->lock); |
201 | status = ohci_restart (ohci); |
202 | |
203 | usb_root_hub_lost_power(rhdev: hcd->self.root_hub); |
204 | |
205 | spin_lock_irq (lock: &ohci->lock); |
206 | } |
207 | return status; |
208 | } |
209 | if (status != -EINPROGRESS) |
210 | return status; |
211 | if (autostopped) |
212 | goto skip_resume; |
213 | spin_unlock_irq (lock: &ohci->lock); |
214 | |
215 | /* Some controllers (lucent erratum) need extra-long delays */ |
216 | msleep (msecs: 20 /* usb 11.5.1.10 */ + 12 /* 32 msec counter */ + 1); |
217 | |
218 | temp = ohci_readl (ohci, &ohci->regs->control); |
219 | temp &= OHCI_CTRL_HCFS; |
220 | if (temp != OHCI_USB_RESUME) { |
221 | ohci_err (ohci, "controller won't resume\n" ); |
222 | spin_lock_irq(lock: &ohci->lock); |
223 | return -EBUSY; |
224 | } |
225 | |
226 | /* disable old schedule state, reinit from scratch */ |
227 | ohci_writel (ohci, 0, &ohci->regs->ed_controlhead); |
228 | ohci_writel (ohci, 0, &ohci->regs->ed_controlcurrent); |
229 | ohci_writel (ohci, 0, &ohci->regs->ed_bulkhead); |
230 | ohci_writel (ohci, 0, &ohci->regs->ed_bulkcurrent); |
231 | ohci_writel (ohci, 0, &ohci->regs->ed_periodcurrent); |
232 | ohci_writel (ohci, (u32) ohci->hcca_dma, &ohci->regs->hcca); |
233 | |
234 | /* Sometimes PCI D3 suspend trashes frame timings ... */ |
235 | periodic_reinit (ohci); |
236 | |
237 | /* |
238 | * The following code is executed with ohci->lock held and |
239 | * irqs disabled if and only if autostopped is true. This |
240 | * will cause sparse to warn about a "context imbalance". |
241 | */ |
242 | skip_resume: |
243 | /* interrupts might have been disabled */ |
244 | ohci_writel (ohci, OHCI_INTR_INIT, &ohci->regs->intrenable); |
245 | if (ohci->ed_rm_list) |
246 | ohci_writel (ohci, OHCI_INTR_SF, &ohci->regs->intrenable); |
247 | |
248 | /* Then re-enable operations */ |
249 | ohci_writel (ohci, OHCI_USB_OPER, &ohci->regs->control); |
250 | (void) ohci_readl (ohci, &ohci->regs->control); |
251 | if (!autostopped) |
252 | msleep (msecs: 3); |
253 | |
254 | temp = ohci->hc_control; |
255 | temp &= OHCI_CTRL_RWC; |
256 | temp |= OHCI_CONTROL_INIT | OHCI_USB_OPER; |
257 | ohci->hc_control = temp; |
258 | ohci_writel (ohci, temp, &ohci->regs->control); |
259 | (void) ohci_readl (ohci, &ohci->regs->control); |
260 | |
261 | /* TRSMRCY */ |
262 | if (!autostopped) { |
263 | msleep (msecs: 10); |
264 | spin_lock_irq (lock: &ohci->lock); |
265 | } |
266 | /* now ohci->lock is always held and irqs are always disabled */ |
267 | |
268 | /* keep it alive for more than ~5x suspend + resume costs */ |
269 | ohci->next_statechange = jiffies + STATECHANGE_DELAY; |
270 | |
271 | /* maybe turn schedules back on */ |
272 | enables = 0; |
273 | temp = 0; |
274 | if (!ohci->ed_rm_list) { |
275 | if (ohci->ed_controltail) { |
276 | ohci_writel (ohci, |
277 | find_head (ohci->ed_controltail)->dma, |
278 | &ohci->regs->ed_controlhead); |
279 | enables |= OHCI_CTRL_CLE; |
280 | temp |= OHCI_CLF; |
281 | } |
282 | if (ohci->ed_bulktail) { |
283 | ohci_writel (ohci, find_head (ohci->ed_bulktail)->dma, |
284 | &ohci->regs->ed_bulkhead); |
285 | enables |= OHCI_CTRL_BLE; |
286 | temp |= OHCI_BLF; |
287 | } |
288 | } |
289 | if (hcd->self.bandwidth_isoc_reqs || hcd->self.bandwidth_int_reqs) |
290 | enables |= OHCI_CTRL_PLE|OHCI_CTRL_IE; |
291 | if (enables) { |
292 | ohci_dbg (ohci, "restarting schedules ... %08x\n" , enables); |
293 | ohci->hc_control |= enables; |
294 | ohci_writel (ohci, ohci->hc_control, &ohci->regs->control); |
295 | if (temp) |
296 | ohci_writel (ohci, temp, &ohci->regs->cmdstatus); |
297 | (void) ohci_readl (ohci, &ohci->regs->control); |
298 | } |
299 | |
300 | ohci->rh_state = OHCI_RH_RUNNING; |
301 | return 0; |
302 | } |
303 | |
304 | static int ohci_bus_suspend (struct usb_hcd *hcd) |
305 | { |
306 | struct ohci_hcd *ohci = hcd_to_ohci (hcd); |
307 | int rc; |
308 | |
309 | spin_lock_irq (lock: &ohci->lock); |
310 | |
311 | if (unlikely(!HCD_HW_ACCESSIBLE(hcd))) |
312 | rc = -ESHUTDOWN; |
313 | else |
314 | rc = ohci_rh_suspend (ohci, autostop: 0); |
315 | spin_unlock_irq (lock: &ohci->lock); |
316 | |
317 | if (rc == 0) { |
318 | del_timer_sync(timer: &ohci->io_watchdog); |
319 | ohci->prev_frame_no = IO_WATCHDOG_OFF; |
320 | } |
321 | return rc; |
322 | } |
323 | |
324 | static int ohci_bus_resume (struct usb_hcd *hcd) |
325 | { |
326 | struct ohci_hcd *ohci = hcd_to_ohci (hcd); |
327 | int rc; |
328 | |
329 | if (time_before (jiffies, ohci->next_statechange)) |
330 | msleep(msecs: 5); |
331 | |
332 | spin_lock_irq (lock: &ohci->lock); |
333 | |
334 | if (unlikely(!HCD_HW_ACCESSIBLE(hcd))) |
335 | rc = -ESHUTDOWN; |
336 | else |
337 | rc = ohci_rh_resume (ohci); |
338 | spin_unlock_irq (lock: &ohci->lock); |
339 | |
340 | /* poll until we know a device is connected or we autostop */ |
341 | if (rc == 0) |
342 | usb_hcd_poll_rh_status(hcd); |
343 | return rc; |
344 | } |
345 | |
346 | /* Carry out polling-, autostop-, and autoresume-related state changes */ |
347 | static int ohci_root_hub_state_changes(struct ohci_hcd *ohci, int changed, |
348 | int any_connected, int rhsc_status) |
349 | { |
350 | int poll_rh = 1; |
351 | int rhsc_enable; |
352 | |
353 | /* Some broken controllers never turn off RHSC in the interrupt |
354 | * status register. For their sake we won't re-enable RHSC |
355 | * interrupts if the interrupt bit is already active. |
356 | */ |
357 | rhsc_enable = ohci_readl(ohci, &ohci->regs->intrenable) & |
358 | OHCI_INTR_RHSC; |
359 | |
360 | switch (ohci->hc_control & OHCI_CTRL_HCFS) { |
361 | case OHCI_USB_OPER: |
362 | /* If no status changes are pending, enable RHSC interrupts. */ |
363 | if (!rhsc_enable && !rhsc_status && !changed) { |
364 | rhsc_enable = OHCI_INTR_RHSC; |
365 | ohci_writel(ohci, rhsc_enable, &ohci->regs->intrenable); |
366 | } |
367 | |
368 | /* Keep on polling until we know a device is connected |
369 | * and RHSC is enabled, or until we autostop. |
370 | */ |
371 | if (!ohci->autostop) { |
372 | if (any_connected || |
373 | !device_may_wakeup(dev: &ohci_to_hcd(ohci) |
374 | ->self.root_hub->dev)) { |
375 | if (rhsc_enable) |
376 | poll_rh = 0; |
377 | } else { |
378 | ohci->autostop = 1; |
379 | ohci->next_statechange = jiffies + HZ; |
380 | } |
381 | |
382 | /* if no devices have been attached for one second, autostop */ |
383 | } else { |
384 | if (changed || any_connected) { |
385 | ohci->autostop = 0; |
386 | ohci->next_statechange = jiffies + |
387 | STATECHANGE_DELAY; |
388 | } else if (time_after_eq(jiffies, |
389 | ohci->next_statechange) |
390 | && !ohci->ed_rm_list |
391 | && !(ohci->hc_control & |
392 | OHCI_SCHED_ENABLES)) { |
393 | ohci_rh_suspend(ohci, autostop: 1); |
394 | if (rhsc_enable) |
395 | poll_rh = 0; |
396 | } |
397 | } |
398 | break; |
399 | |
400 | case OHCI_USB_SUSPEND: |
401 | case OHCI_USB_RESUME: |
402 | /* if there is a port change, autostart or ask to be resumed */ |
403 | if (changed) { |
404 | if (ohci->autostop) |
405 | ohci_rh_resume(ohci); |
406 | else |
407 | usb_hcd_resume_root_hub(hcd: ohci_to_hcd(ohci)); |
408 | |
409 | /* If remote wakeup is disabled, stop polling */ |
410 | } else if (!ohci->autostop && |
411 | !ohci_to_hcd(ohci)->self.root_hub-> |
412 | do_remote_wakeup) { |
413 | poll_rh = 0; |
414 | |
415 | } else { |
416 | /* If no status changes are pending, |
417 | * enable RHSC interrupts |
418 | */ |
419 | if (!rhsc_enable && !rhsc_status) { |
420 | rhsc_enable = OHCI_INTR_RHSC; |
421 | ohci_writel(ohci, rhsc_enable, |
422 | &ohci->regs->intrenable); |
423 | } |
424 | /* Keep polling until RHSC is enabled */ |
425 | if (rhsc_enable) |
426 | poll_rh = 0; |
427 | } |
428 | break; |
429 | } |
430 | return poll_rh; |
431 | } |
432 | |
433 | #else /* CONFIG_PM */ |
434 | |
435 | static inline int ohci_rh_resume(struct ohci_hcd *ohci) |
436 | { |
437 | return 0; |
438 | } |
439 | |
440 | /* Carry out polling-related state changes. |
441 | * autostop isn't used when CONFIG_PM is turned off. |
442 | */ |
443 | static int ohci_root_hub_state_changes(struct ohci_hcd *ohci, int changed, |
444 | int any_connected, int rhsc_status) |
445 | { |
446 | /* If RHSC is enabled, don't poll */ |
447 | if (ohci_readl(ohci, &ohci->regs->intrenable) & OHCI_INTR_RHSC) |
448 | return 0; |
449 | |
450 | /* If status changes are pending, continue polling. |
451 | * Conversely, if no status changes are pending but the RHSC |
452 | * status bit was set, then RHSC may be broken so continue polling. |
453 | */ |
454 | if (changed || rhsc_status) |
455 | return 1; |
456 | |
457 | /* It's safe to re-enable RHSC interrupts */ |
458 | ohci_writel(ohci, OHCI_INTR_RHSC, &ohci->regs->intrenable); |
459 | return 0; |
460 | } |
461 | |
462 | #endif /* CONFIG_PM */ |
463 | |
464 | /*-------------------------------------------------------------------------*/ |
465 | |
466 | /* build "status change" packet (one or two bytes) from HC registers */ |
467 | |
468 | int ohci_hub_status_data(struct usb_hcd *hcd, char *buf) |
469 | { |
470 | struct ohci_hcd *ohci = hcd_to_ohci (hcd); |
471 | int i, changed = 0, length = 1; |
472 | int any_connected = 0; |
473 | int rhsc_status; |
474 | unsigned long flags; |
475 | |
476 | spin_lock_irqsave (&ohci->lock, flags); |
477 | if (!HCD_HW_ACCESSIBLE(hcd)) |
478 | goto done; |
479 | |
480 | /* undocumented erratum seen on at least rev D */ |
481 | if ((ohci->flags & OHCI_QUIRK_AMD756) |
482 | && (roothub_a (hc: ohci) & RH_A_NDP) > MAX_ROOT_PORTS) { |
483 | ohci_warn (ohci, "bogus NDP, rereads as NDP=%d\n" , |
484 | ohci_readl (ohci, &ohci->regs->roothub.a) & RH_A_NDP); |
485 | /* retry later; "should not happen" */ |
486 | goto done; |
487 | } |
488 | |
489 | /* init status */ |
490 | if (roothub_status (hc: ohci) & (RH_HS_LPSC | RH_HS_OCIC)) |
491 | buf [0] = changed = 1; |
492 | else |
493 | buf [0] = 0; |
494 | if (ohci->num_ports > 7) { |
495 | buf [1] = 0; |
496 | length++; |
497 | } |
498 | |
499 | /* Clear the RHSC status flag before reading the port statuses */ |
500 | ohci_writel(ohci, OHCI_INTR_RHSC, &ohci->regs->intrstatus); |
501 | rhsc_status = ohci_readl(ohci, &ohci->regs->intrstatus) & |
502 | OHCI_INTR_RHSC; |
503 | |
504 | /* look at each port */ |
505 | for (i = 0; i < ohci->num_ports; i++) { |
506 | u32 status = roothub_portstatus (hc: ohci, i); |
507 | |
508 | /* can't autostop if ports are connected */ |
509 | any_connected |= (status & RH_PS_CCS); |
510 | |
511 | if (status & (RH_PS_CSC | RH_PS_PESC | RH_PS_PSSC |
512 | | RH_PS_OCIC | RH_PS_PRSC)) { |
513 | changed = 1; |
514 | if (i < 7) |
515 | buf [0] |= 1 << (i + 1); |
516 | else |
517 | buf [1] |= 1 << (i - 7); |
518 | } |
519 | } |
520 | |
521 | if (ohci_root_hub_state_changes(ohci, changed, |
522 | any_connected, rhsc_status)) |
523 | set_bit(HCD_FLAG_POLL_RH, addr: &hcd->flags); |
524 | else |
525 | clear_bit(HCD_FLAG_POLL_RH, addr: &hcd->flags); |
526 | |
527 | |
528 | done: |
529 | spin_unlock_irqrestore (lock: &ohci->lock, flags); |
530 | |
531 | return changed ? length : 0; |
532 | } |
533 | EXPORT_SYMBOL_GPL(ohci_hub_status_data); |
534 | |
535 | /*-------------------------------------------------------------------------*/ |
536 | |
537 | static void |
538 | ohci_hub_descriptor ( |
539 | struct ohci_hcd *ohci, |
540 | struct usb_hub_descriptor *desc |
541 | ) { |
542 | u32 rh = roothub_a (hc: ohci); |
543 | u16 temp; |
544 | |
545 | desc->bDescriptorType = USB_DT_HUB; |
546 | desc->bPwrOn2PwrGood = (rh & RH_A_POTPGT) >> 24; |
547 | desc->bHubContrCurrent = 0; |
548 | |
549 | desc->bNbrPorts = ohci->num_ports; |
550 | temp = 1 + (ohci->num_ports / 8); |
551 | desc->bDescLength = 7 + 2 * temp; |
552 | |
553 | temp = HUB_CHAR_COMMON_LPSM | HUB_CHAR_COMMON_OCPM; |
554 | if (rh & RH_A_NPS) /* no power switching? */ |
555 | temp |= HUB_CHAR_NO_LPSM; |
556 | if (rh & RH_A_PSM) /* per-port power switching? */ |
557 | temp |= HUB_CHAR_INDV_PORT_LPSM; |
558 | if (rh & RH_A_NOCP) /* no overcurrent reporting? */ |
559 | temp |= HUB_CHAR_NO_OCPM; |
560 | else if (rh & RH_A_OCPM) /* per-port overcurrent reporting? */ |
561 | temp |= HUB_CHAR_INDV_PORT_OCPM; |
562 | desc->wHubCharacteristics = cpu_to_le16(temp); |
563 | |
564 | /* ports removable, and usb 1.0 legacy PortPwrCtrlMask */ |
565 | rh = roothub_b (hc: ohci); |
566 | memset(desc->u.hs.DeviceRemovable, 0xff, |
567 | sizeof(desc->u.hs.DeviceRemovable)); |
568 | desc->u.hs.DeviceRemovable[0] = rh & RH_B_DR; |
569 | if (ohci->num_ports > 7) { |
570 | desc->u.hs.DeviceRemovable[1] = (rh & RH_B_DR) >> 8; |
571 | desc->u.hs.DeviceRemovable[2] = 0xff; |
572 | } else |
573 | desc->u.hs.DeviceRemovable[1] = 0xff; |
574 | } |
575 | |
576 | /*-------------------------------------------------------------------------*/ |
577 | |
578 | #ifdef CONFIG_USB_OTG |
579 | |
580 | static int ohci_start_port_reset (struct usb_hcd *hcd, unsigned port) |
581 | { |
582 | struct ohci_hcd *ohci = hcd_to_ohci (hcd); |
583 | u32 status; |
584 | |
585 | if (!port) |
586 | return -EINVAL; |
587 | port--; |
588 | |
589 | /* start port reset before HNP protocol times out */ |
590 | status = ohci_readl(ohci, &ohci->regs->roothub.portstatus [port]); |
591 | if (!(status & RH_PS_CCS)) |
592 | return -ENODEV; |
593 | |
594 | /* hub_wq will finish the reset later */ |
595 | ohci_writel(ohci, RH_PS_PRS, &ohci->regs->roothub.portstatus [port]); |
596 | return 0; |
597 | } |
598 | |
599 | #else |
600 | |
601 | #define ohci_start_port_reset NULL |
602 | |
603 | #endif |
604 | |
605 | /*-------------------------------------------------------------------------*/ |
606 | |
607 | |
608 | /* See usb 7.1.7.5: root hubs must issue at least 50 msec reset signaling, |
609 | * not necessarily continuous ... to guard against resume signaling. |
610 | */ |
611 | #define PORT_RESET_MSEC 50 |
612 | |
613 | /* this timer value might be vendor-specific ... */ |
614 | #define PORT_RESET_HW_MSEC 10 |
615 | |
616 | /* wrap-aware logic morphed from <linux/jiffies.h> */ |
617 | #define tick_before(t1,t2) ((s16)(((s16)(t1))-((s16)(t2))) < 0) |
618 | |
619 | /* called from some task, normally hub_wq */ |
620 | static inline int root_port_reset (struct ohci_hcd *ohci, unsigned port) |
621 | { |
622 | __hc32 __iomem *portstat = &ohci->regs->roothub.portstatus [port]; |
623 | u32 temp = 0; |
624 | u16 now = ohci_readl(ohci, &ohci->regs->fmnumber); |
625 | u16 reset_done = now + PORT_RESET_MSEC; |
626 | int limit_1 = DIV_ROUND_UP(PORT_RESET_MSEC, PORT_RESET_HW_MSEC); |
627 | |
628 | /* build a "continuous enough" reset signal, with up to |
629 | * 3msec gap between pulses. scheduler HZ==100 must work; |
630 | * this might need to be deadline-scheduled. |
631 | */ |
632 | do { |
633 | int limit_2; |
634 | |
635 | /* spin until any current reset finishes */ |
636 | limit_2 = PORT_RESET_HW_MSEC * 2; |
637 | while (--limit_2 >= 0) { |
638 | temp = ohci_readl (ohci, portstat); |
639 | /* handle e.g. CardBus eject */ |
640 | if (temp == ~(u32)0) |
641 | return -ESHUTDOWN; |
642 | if (!(temp & RH_PS_PRS)) |
643 | break; |
644 | udelay (500); |
645 | } |
646 | |
647 | /* timeout (a hardware error) has been observed when |
648 | * EHCI sets CF while this driver is resetting a port; |
649 | * presumably other disconnect paths might do it too. |
650 | */ |
651 | if (limit_2 < 0) { |
652 | ohci_dbg(ohci, |
653 | "port[%d] reset timeout, stat %08x\n" , |
654 | port, temp); |
655 | break; |
656 | } |
657 | |
658 | if (!(temp & RH_PS_CCS)) |
659 | break; |
660 | if (temp & RH_PS_PRSC) |
661 | ohci_writel (ohci, RH_PS_PRSC, portstat); |
662 | |
663 | /* start the next reset, sleep till it's probably done */ |
664 | ohci_writel (ohci, RH_PS_PRS, portstat); |
665 | msleep(PORT_RESET_HW_MSEC); |
666 | now = ohci_readl(ohci, &ohci->regs->fmnumber); |
667 | } while (tick_before(now, reset_done) && --limit_1 >= 0); |
668 | |
669 | /* caller synchronizes using PRSC ... and handles PRS |
670 | * still being set when this returns. |
671 | */ |
672 | |
673 | return 0; |
674 | } |
675 | |
676 | int ohci_hub_control( |
677 | struct usb_hcd *hcd, |
678 | u16 typeReq, |
679 | u16 wValue, |
680 | u16 wIndex, |
681 | char *buf, |
682 | u16 wLength |
683 | ) { |
684 | struct ohci_hcd *ohci = hcd_to_ohci (hcd); |
685 | int ports = ohci->num_ports; |
686 | u32 temp; |
687 | int retval = 0; |
688 | |
689 | if (unlikely(!HCD_HW_ACCESSIBLE(hcd))) |
690 | return -ESHUTDOWN; |
691 | |
692 | switch (typeReq) { |
693 | case ClearHubFeature: |
694 | switch (wValue) { |
695 | case C_HUB_OVER_CURRENT: |
696 | ohci_writel (ohci, RH_HS_OCIC, |
697 | &ohci->regs->roothub.status); |
698 | break; |
699 | case C_HUB_LOCAL_POWER: |
700 | break; |
701 | default: |
702 | goto error; |
703 | } |
704 | break; |
705 | case ClearPortFeature: |
706 | if (!wIndex || wIndex > ports) |
707 | goto error; |
708 | wIndex--; |
709 | |
710 | switch (wValue) { |
711 | case USB_PORT_FEAT_ENABLE: |
712 | temp = RH_PS_CCS; |
713 | break; |
714 | case USB_PORT_FEAT_C_ENABLE: |
715 | temp = RH_PS_PESC; |
716 | break; |
717 | case USB_PORT_FEAT_SUSPEND: |
718 | temp = RH_PS_POCI; |
719 | break; |
720 | case USB_PORT_FEAT_C_SUSPEND: |
721 | temp = RH_PS_PSSC; |
722 | break; |
723 | case USB_PORT_FEAT_POWER: |
724 | temp = RH_PS_LSDA; |
725 | break; |
726 | case USB_PORT_FEAT_C_CONNECTION: |
727 | temp = RH_PS_CSC; |
728 | break; |
729 | case USB_PORT_FEAT_C_OVER_CURRENT: |
730 | temp = RH_PS_OCIC; |
731 | break; |
732 | case USB_PORT_FEAT_C_RESET: |
733 | temp = RH_PS_PRSC; |
734 | break; |
735 | default: |
736 | goto error; |
737 | } |
738 | ohci_writel (ohci, temp, |
739 | &ohci->regs->roothub.portstatus [wIndex]); |
740 | // ohci_readl (ohci, &ohci->regs->roothub.portstatus [wIndex]); |
741 | break; |
742 | case GetHubDescriptor: |
743 | ohci_hub_descriptor (ohci, desc: (struct usb_hub_descriptor *) buf); |
744 | break; |
745 | case GetHubStatus: |
746 | temp = roothub_status (hc: ohci) & ~(RH_HS_CRWE | RH_HS_DRWE); |
747 | put_unaligned_le32(val: temp, p: buf); |
748 | break; |
749 | case GetPortStatus: |
750 | if (!wIndex || wIndex > ports) |
751 | goto error; |
752 | wIndex--; |
753 | temp = roothub_portstatus (hc: ohci, i: wIndex); |
754 | put_unaligned_le32(val: temp, p: buf); |
755 | |
756 | if (*(u16*)(buf+2)) /* only if wPortChange is interesting */ |
757 | dbg_port(ohci, "GetStatus" , wIndex, temp); |
758 | break; |
759 | case SetHubFeature: |
760 | switch (wValue) { |
761 | case C_HUB_OVER_CURRENT: |
762 | // FIXME: this can be cleared, yes? |
763 | case C_HUB_LOCAL_POWER: |
764 | break; |
765 | default: |
766 | goto error; |
767 | } |
768 | break; |
769 | case SetPortFeature: |
770 | if (!wIndex || wIndex > ports) |
771 | goto error; |
772 | wIndex--; |
773 | switch (wValue) { |
774 | case USB_PORT_FEAT_SUSPEND: |
775 | #ifdef CONFIG_USB_OTG |
776 | if (hcd->self.otg_port == (wIndex + 1) |
777 | && hcd->self.b_hnp_enable) |
778 | ohci->start_hnp(ohci); |
779 | else |
780 | #endif |
781 | ohci_writel (ohci, RH_PS_PSS, |
782 | &ohci->regs->roothub.portstatus [wIndex]); |
783 | break; |
784 | case USB_PORT_FEAT_POWER: |
785 | ohci_writel (ohci, RH_PS_PPS, |
786 | &ohci->regs->roothub.portstatus [wIndex]); |
787 | break; |
788 | case USB_PORT_FEAT_RESET: |
789 | retval = root_port_reset (ohci, port: wIndex); |
790 | break; |
791 | default: |
792 | goto error; |
793 | } |
794 | break; |
795 | |
796 | default: |
797 | error: |
798 | /* "protocol stall" on error */ |
799 | retval = -EPIPE; |
800 | } |
801 | return retval; |
802 | } |
803 | EXPORT_SYMBOL_GPL(ohci_hub_control); |
804 | |