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1da177e4 LT |
1 | /* |
2 | * Copyright (c) 2001-2002 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_hub_suspend (struct usb_hcd *hcd) | |
34 | { | |
35 | struct ehci_hcd *ehci = hcd_to_ehci (hcd); | |
36 | int port; | |
37 | ||
38 | if (time_before (jiffies, ehci->next_statechange)) | |
39 | msleep(5); | |
40 | ||
41 | port = HCS_N_PORTS (ehci->hcs_params); | |
42 | spin_lock_irq (&ehci->lock); | |
43 | ||
44 | /* stop schedules, clean any completed work */ | |
45 | if (HC_IS_RUNNING(hcd->state)) { | |
46 | ehci_quiesce (ehci); | |
47 | hcd->state = HC_STATE_QUIESCING; | |
48 | } | |
49 | ehci->command = readl (&ehci->regs->command); | |
50 | if (ehci->reclaim) | |
51 | ehci->reclaim_ready = 1; | |
52 | ehci_work(ehci, NULL); | |
53 | ||
54 | /* suspend any active/unsuspended ports, maybe allow wakeup */ | |
55 | while (port--) { | |
56 | u32 __iomem *reg = &ehci->regs->port_status [port]; | |
57 | u32 t1 = readl (reg); | |
58 | u32 t2 = t1; | |
59 | ||
60 | if ((t1 & PORT_PE) && !(t1 & PORT_OWNER)) | |
61 | t2 |= PORT_SUSPEND; | |
62 | if (hcd->remote_wakeup) | |
63 | t2 |= PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E; | |
64 | else | |
65 | t2 &= ~(PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E); | |
66 | ||
67 | if (t1 != t2) { | |
68 | ehci_vdbg (ehci, "port %d, %08x -> %08x\n", | |
69 | port + 1, t1, t2); | |
70 | writel (t2, reg); | |
71 | } | |
72 | } | |
73 | ||
74 | /* turn off now-idle HC */ | |
75 | ehci_halt (ehci); | |
76 | hcd->state = HC_STATE_SUSPENDED; | |
77 | ||
78 | ehci->next_statechange = jiffies + msecs_to_jiffies(10); | |
79 | spin_unlock_irq (&ehci->lock); | |
80 | return 0; | |
81 | } | |
82 | ||
83 | ||
84 | /* caller has locked the root hub, and should reset/reinit on error */ | |
85 | static int ehci_hub_resume (struct usb_hcd *hcd) | |
86 | { | |
87 | struct ehci_hcd *ehci = hcd_to_ehci (hcd); | |
88 | u32 temp; | |
89 | int i; | |
90 | int intr_enable; | |
91 | ||
92 | if (time_before (jiffies, ehci->next_statechange)) | |
93 | msleep(5); | |
94 | spin_lock_irq (&ehci->lock); | |
95 | ||
96 | /* re-init operational registers in case we lost power */ | |
97 | if (readl (&ehci->regs->intr_enable) == 0) { | |
98 | /* at least some APM implementations will try to deliver | |
99 | * IRQs right away, so delay them until we're ready. | |
100 | */ | |
101 | intr_enable = 1; | |
102 | writel (0, &ehci->regs->segment); | |
103 | writel (ehci->periodic_dma, &ehci->regs->frame_list); | |
104 | writel ((u32)ehci->async->qh_dma, &ehci->regs->async_next); | |
105 | } else | |
106 | intr_enable = 0; | |
107 | ehci_dbg(ehci, "resume root hub%s\n", | |
108 | intr_enable ? " after power loss" : ""); | |
109 | ||
110 | /* restore CMD_RUN, framelist size, and irq threshold */ | |
111 | writel (ehci->command, &ehci->regs->command); | |
112 | ||
113 | /* take ports out of suspend */ | |
114 | i = HCS_N_PORTS (ehci->hcs_params); | |
115 | while (i--) { | |
116 | temp = readl (&ehci->regs->port_status [i]); | |
117 | temp &= ~(PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E); | |
118 | if (temp & PORT_SUSPEND) { | |
119 | ehci->reset_done [i] = jiffies + msecs_to_jiffies (20); | |
120 | temp |= PORT_RESUME; | |
121 | } | |
122 | writel (temp, &ehci->regs->port_status [i]); | |
123 | } | |
124 | i = HCS_N_PORTS (ehci->hcs_params); | |
125 | mdelay (20); | |
126 | while (i--) { | |
127 | temp = readl (&ehci->regs->port_status [i]); | |
128 | if ((temp & PORT_SUSPEND) == 0) | |
129 | continue; | |
130 | temp &= ~PORT_RESUME; | |
131 | writel (temp, &ehci->regs->port_status [i]); | |
132 | ehci_vdbg (ehci, "resumed port %d\n", i + 1); | |
133 | } | |
134 | (void) readl (&ehci->regs->command); | |
135 | ||
136 | /* maybe re-activate the schedule(s) */ | |
137 | temp = 0; | |
138 | if (ehci->async->qh_next.qh) | |
139 | temp |= CMD_ASE; | |
140 | if (ehci->periodic_sched) | |
141 | temp |= CMD_PSE; | |
142 | if (temp) { | |
143 | ehci->command |= temp; | |
144 | writel (ehci->command, &ehci->regs->command); | |
145 | } | |
146 | ||
147 | ehci->next_statechange = jiffies + msecs_to_jiffies(5); | |
148 | hcd->state = HC_STATE_RUNNING; | |
149 | ||
150 | /* Now we can safely re-enable irqs */ | |
151 | if (intr_enable) | |
152 | writel (INTR_MASK, &ehci->regs->intr_enable); | |
153 | ||
154 | spin_unlock_irq (&ehci->lock); | |
155 | return 0; | |
156 | } | |
157 | ||
158 | #else | |
159 | ||
160 | #define ehci_hub_suspend NULL | |
161 | #define ehci_hub_resume NULL | |
162 | ||
163 | #endif /* CONFIG_PM */ | |
164 | ||
165 | /*-------------------------------------------------------------------------*/ | |
166 | ||
167 | static int check_reset_complete ( | |
168 | struct ehci_hcd *ehci, | |
169 | int index, | |
170 | int port_status | |
171 | ) { | |
172 | if (!(port_status & PORT_CONNECT)) { | |
173 | ehci->reset_done [index] = 0; | |
174 | return port_status; | |
175 | } | |
176 | ||
177 | /* if reset finished and it's still not enabled -- handoff */ | |
178 | if (!(port_status & PORT_PE)) { | |
179 | ||
180 | /* with integrated TT, there's nobody to hand it to! */ | |
181 | if (ehci_is_TDI(ehci)) { | |
182 | ehci_dbg (ehci, | |
183 | "Failed to enable port %d on root hub TT\n", | |
184 | index+1); | |
185 | return port_status; | |
186 | } | |
187 | ||
188 | ehci_dbg (ehci, "port %d full speed --> companion\n", | |
189 | index + 1); | |
190 | ||
191 | // what happens if HCS_N_CC(params) == 0 ? | |
192 | port_status |= PORT_OWNER; | |
193 | writel (port_status, &ehci->regs->port_status [index]); | |
194 | ||
195 | } else | |
196 | ehci_dbg (ehci, "port %d high speed\n", index + 1); | |
197 | ||
198 | return port_status; | |
199 | } | |
200 | ||
201 | /*-------------------------------------------------------------------------*/ | |
202 | ||
203 | ||
204 | /* build "status change" packet (one or two bytes) from HC registers */ | |
205 | ||
206 | static int | |
207 | ehci_hub_status_data (struct usb_hcd *hcd, char *buf) | |
208 | { | |
209 | struct ehci_hcd *ehci = hcd_to_ehci (hcd); | |
210 | u32 temp, status = 0; | |
211 | int ports, i, retval = 1; | |
212 | unsigned long flags; | |
213 | ||
214 | /* if !USB_SUSPEND, root hub timers won't get shut down ... */ | |
215 | if (!HC_IS_RUNNING(hcd->state)) | |
216 | return 0; | |
217 | ||
218 | /* init status to no-changes */ | |
219 | buf [0] = 0; | |
220 | ports = HCS_N_PORTS (ehci->hcs_params); | |
221 | if (ports > 7) { | |
222 | buf [1] = 0; | |
223 | retval++; | |
224 | } | |
225 | ||
226 | /* no hub change reports (bit 0) for now (power, ...) */ | |
227 | ||
228 | /* port N changes (bit N)? */ | |
229 | spin_lock_irqsave (&ehci->lock, flags); | |
230 | for (i = 0; i < ports; i++) { | |
231 | temp = readl (&ehci->regs->port_status [i]); | |
232 | if (temp & PORT_OWNER) { | |
233 | /* don't report this in GetPortStatus */ | |
234 | if (temp & PORT_CSC) { | |
235 | temp &= ~PORT_CSC; | |
236 | writel (temp, &ehci->regs->port_status [i]); | |
237 | } | |
238 | continue; | |
239 | } | |
240 | if (!(temp & PORT_CONNECT)) | |
241 | ehci->reset_done [i] = 0; | |
242 | if ((temp & (PORT_CSC | PORT_PEC | PORT_OCC)) != 0 | |
243 | // PORT_STAT_C_SUSPEND? | |
244 | || ((temp & PORT_RESUME) != 0 | |
245 | && time_after (jiffies, | |
246 | ehci->reset_done [i]))) { | |
247 | if (i < 7) | |
248 | buf [0] |= 1 << (i + 1); | |
249 | else | |
250 | buf [1] |= 1 << (i - 7); | |
251 | status = STS_PCD; | |
252 | } | |
253 | } | |
254 | /* FIXME autosuspend idle root hubs */ | |
255 | spin_unlock_irqrestore (&ehci->lock, flags); | |
256 | return status ? retval : 0; | |
257 | } | |
258 | ||
259 | /*-------------------------------------------------------------------------*/ | |
260 | ||
261 | static void | |
262 | ehci_hub_descriptor ( | |
263 | struct ehci_hcd *ehci, | |
264 | struct usb_hub_descriptor *desc | |
265 | ) { | |
266 | int ports = HCS_N_PORTS (ehci->hcs_params); | |
267 | u16 temp; | |
268 | ||
269 | desc->bDescriptorType = 0x29; | |
270 | desc->bPwrOn2PwrGood = 10; /* ehci 1.0, 2.3.9 says 20ms max */ | |
271 | desc->bHubContrCurrent = 0; | |
272 | ||
273 | desc->bNbrPorts = ports; | |
274 | temp = 1 + (ports / 8); | |
275 | desc->bDescLength = 7 + 2 * temp; | |
276 | ||
277 | /* two bitmaps: ports removable, and usb 1.0 legacy PortPwrCtrlMask */ | |
278 | memset (&desc->bitmap [0], 0, temp); | |
279 | memset (&desc->bitmap [temp], 0xff, temp); | |
280 | ||
281 | temp = 0x0008; /* per-port overcurrent reporting */ | |
282 | if (HCS_PPC (ehci->hcs_params)) | |
283 | temp |= 0x0001; /* per-port power control */ | |
284 | #if 0 | |
285 | // re-enable when we support USB_PORT_FEAT_INDICATOR below. | |
286 | if (HCS_INDICATOR (ehci->hcs_params)) | |
287 | temp |= 0x0080; /* per-port indicators (LEDs) */ | |
288 | #endif | |
289 | desc->wHubCharacteristics = (__force __u16)cpu_to_le16 (temp); | |
290 | } | |
291 | ||
292 | /*-------------------------------------------------------------------------*/ | |
293 | ||
294 | #define PORT_WAKE_BITS (PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E) | |
295 | ||
296 | static int ehci_hub_control ( | |
297 | struct usb_hcd *hcd, | |
298 | u16 typeReq, | |
299 | u16 wValue, | |
300 | u16 wIndex, | |
301 | char *buf, | |
302 | u16 wLength | |
303 | ) { | |
304 | struct ehci_hcd *ehci = hcd_to_ehci (hcd); | |
305 | int ports = HCS_N_PORTS (ehci->hcs_params); | |
306 | u32 temp, status; | |
307 | unsigned long flags; | |
308 | int retval = 0; | |
309 | ||
310 | /* | |
311 | * FIXME: support SetPortFeatures USB_PORT_FEAT_INDICATOR. | |
312 | * HCS_INDICATOR may say we can change LEDs to off/amber/green. | |
313 | * (track current state ourselves) ... blink for diagnostics, | |
314 | * power, "this is the one", etc. EHCI spec supports this. | |
315 | */ | |
316 | ||
317 | spin_lock_irqsave (&ehci->lock, flags); | |
318 | switch (typeReq) { | |
319 | case ClearHubFeature: | |
320 | switch (wValue) { | |
321 | case C_HUB_LOCAL_POWER: | |
322 | case C_HUB_OVER_CURRENT: | |
323 | /* no hub-wide feature/status flags */ | |
324 | break; | |
325 | default: | |
326 | goto error; | |
327 | } | |
328 | break; | |
329 | case ClearPortFeature: | |
330 | if (!wIndex || wIndex > ports) | |
331 | goto error; | |
332 | wIndex--; | |
333 | temp = readl (&ehci->regs->port_status [wIndex]); | |
334 | if (temp & PORT_OWNER) | |
335 | break; | |
336 | ||
337 | switch (wValue) { | |
338 | case USB_PORT_FEAT_ENABLE: | |
339 | writel (temp & ~PORT_PE, | |
340 | &ehci->regs->port_status [wIndex]); | |
341 | break; | |
342 | case USB_PORT_FEAT_C_ENABLE: | |
343 | writel (temp | PORT_PEC, | |
344 | &ehci->regs->port_status [wIndex]); | |
345 | break; | |
346 | case USB_PORT_FEAT_SUSPEND: | |
347 | if (temp & PORT_RESET) | |
348 | goto error; | |
349 | if (temp & PORT_SUSPEND) { | |
350 | if ((temp & PORT_PE) == 0) | |
351 | goto error; | |
352 | /* resume signaling for 20 msec */ | |
353 | writel ((temp & ~PORT_WAKE_BITS) | PORT_RESUME, | |
354 | &ehci->regs->port_status [wIndex]); | |
355 | ehci->reset_done [wIndex] = jiffies | |
356 | + msecs_to_jiffies (20); | |
357 | } | |
358 | break; | |
359 | case USB_PORT_FEAT_C_SUSPEND: | |
360 | /* we auto-clear this feature */ | |
361 | break; | |
362 | case USB_PORT_FEAT_POWER: | |
363 | if (HCS_PPC (ehci->hcs_params)) | |
364 | writel (temp & ~PORT_POWER, | |
365 | &ehci->regs->port_status [wIndex]); | |
366 | break; | |
367 | case USB_PORT_FEAT_C_CONNECTION: | |
368 | writel (temp | PORT_CSC, | |
369 | &ehci->regs->port_status [wIndex]); | |
370 | break; | |
371 | case USB_PORT_FEAT_C_OVER_CURRENT: | |
372 | writel (temp | PORT_OCC, | |
373 | &ehci->regs->port_status [wIndex]); | |
374 | break; | |
375 | case USB_PORT_FEAT_C_RESET: | |
376 | /* GetPortStatus clears reset */ | |
377 | break; | |
378 | default: | |
379 | goto error; | |
380 | } | |
381 | readl (&ehci->regs->command); /* unblock posted write */ | |
382 | break; | |
383 | case GetHubDescriptor: | |
384 | ehci_hub_descriptor (ehci, (struct usb_hub_descriptor *) | |
385 | buf); | |
386 | break; | |
387 | case GetHubStatus: | |
388 | /* no hub-wide feature/status flags */ | |
389 | memset (buf, 0, 4); | |
390 | //cpu_to_le32s ((u32 *) buf); | |
391 | break; | |
392 | case GetPortStatus: | |
393 | if (!wIndex || wIndex > ports) | |
394 | goto error; | |
395 | wIndex--; | |
396 | status = 0; | |
397 | temp = readl (&ehci->regs->port_status [wIndex]); | |
398 | ||
399 | // wPortChange bits | |
400 | if (temp & PORT_CSC) | |
401 | status |= 1 << USB_PORT_FEAT_C_CONNECTION; | |
402 | if (temp & PORT_PEC) | |
403 | status |= 1 << USB_PORT_FEAT_C_ENABLE; | |
404 | if (temp & PORT_OCC) | |
405 | status |= 1 << USB_PORT_FEAT_C_OVER_CURRENT; | |
406 | ||
407 | /* whoever resumes must GetPortStatus to complete it!! */ | |
408 | if ((temp & PORT_RESUME) | |
409 | && time_after (jiffies, | |
410 | ehci->reset_done [wIndex])) { | |
411 | status |= 1 << USB_PORT_FEAT_C_SUSPEND; | |
412 | ehci->reset_done [wIndex] = 0; | |
413 | ||
414 | /* stop resume signaling */ | |
415 | temp = readl (&ehci->regs->port_status [wIndex]); | |
416 | writel (temp & ~PORT_RESUME, | |
417 | &ehci->regs->port_status [wIndex]); | |
418 | retval = handshake ( | |
419 | &ehci->regs->port_status [wIndex], | |
420 | PORT_RESUME, 0, 2000 /* 2msec */); | |
421 | if (retval != 0) { | |
422 | ehci_err (ehci, "port %d resume error %d\n", | |
423 | wIndex + 1, retval); | |
424 | goto error; | |
425 | } | |
426 | temp &= ~(PORT_SUSPEND|PORT_RESUME|(3<<10)); | |
427 | } | |
428 | ||
429 | /* whoever resets must GetPortStatus to complete it!! */ | |
430 | if ((temp & PORT_RESET) | |
431 | && time_after (jiffies, | |
432 | ehci->reset_done [wIndex])) { | |
433 | status |= 1 << USB_PORT_FEAT_C_RESET; | |
434 | ehci->reset_done [wIndex] = 0; | |
435 | ||
436 | /* force reset to complete */ | |
437 | writel (temp & ~PORT_RESET, | |
438 | &ehci->regs->port_status [wIndex]); | |
439 | retval = handshake ( | |
440 | &ehci->regs->port_status [wIndex], | |
441 | PORT_RESET, 0, 500); | |
442 | if (retval != 0) { | |
443 | ehci_err (ehci, "port %d reset error %d\n", | |
444 | wIndex + 1, retval); | |
445 | goto error; | |
446 | } | |
447 | ||
448 | /* see what we found out */ | |
449 | temp = check_reset_complete (ehci, wIndex, | |
450 | readl (&ehci->regs->port_status [wIndex])); | |
451 | } | |
452 | ||
453 | // don't show wPortStatus if it's owned by a companion hc | |
454 | if (!(temp & PORT_OWNER)) { | |
455 | if (temp & PORT_CONNECT) { | |
456 | status |= 1 << USB_PORT_FEAT_CONNECTION; | |
457 | // status may be from integrated TT | |
458 | status |= ehci_port_speed(ehci, temp); | |
459 | } | |
460 | if (temp & PORT_PE) | |
461 | status |= 1 << USB_PORT_FEAT_ENABLE; | |
462 | if (temp & (PORT_SUSPEND|PORT_RESUME)) | |
463 | status |= 1 << USB_PORT_FEAT_SUSPEND; | |
464 | if (temp & PORT_OC) | |
465 | status |= 1 << USB_PORT_FEAT_OVER_CURRENT; | |
466 | if (temp & PORT_RESET) | |
467 | status |= 1 << USB_PORT_FEAT_RESET; | |
468 | if (temp & PORT_POWER) | |
469 | status |= 1 << USB_PORT_FEAT_POWER; | |
470 | } | |
471 | ||
472 | #ifndef EHCI_VERBOSE_DEBUG | |
473 | if (status & ~0xffff) /* only if wPortChange is interesting */ | |
474 | #endif | |
475 | dbg_port (ehci, "GetStatus", wIndex + 1, temp); | |
476 | // we "know" this alignment is good, caller used kmalloc()... | |
477 | *((__le32 *) buf) = cpu_to_le32 (status); | |
478 | break; | |
479 | case SetHubFeature: | |
480 | switch (wValue) { | |
481 | case C_HUB_LOCAL_POWER: | |
482 | case C_HUB_OVER_CURRENT: | |
483 | /* no hub-wide feature/status flags */ | |
484 | break; | |
485 | default: | |
486 | goto error; | |
487 | } | |
488 | break; | |
489 | case SetPortFeature: | |
490 | if (!wIndex || wIndex > ports) | |
491 | goto error; | |
492 | wIndex--; | |
493 | temp = readl (&ehci->regs->port_status [wIndex]); | |
494 | if (temp & PORT_OWNER) | |
495 | break; | |
496 | ||
497 | switch (wValue) { | |
498 | case USB_PORT_FEAT_SUSPEND: | |
499 | if ((temp & PORT_PE) == 0 | |
500 | || (temp & PORT_RESET) != 0) | |
501 | goto error; | |
502 | if (hcd->remote_wakeup) | |
503 | temp |= PORT_WAKE_BITS; | |
504 | writel (temp | PORT_SUSPEND, | |
505 | &ehci->regs->port_status [wIndex]); | |
506 | break; | |
507 | case USB_PORT_FEAT_POWER: | |
508 | if (HCS_PPC (ehci->hcs_params)) | |
509 | writel (temp | PORT_POWER, | |
510 | &ehci->regs->port_status [wIndex]); | |
511 | break; | |
512 | case USB_PORT_FEAT_RESET: | |
513 | if (temp & PORT_RESUME) | |
514 | goto error; | |
515 | /* line status bits may report this as low speed, | |
516 | * which can be fine if this root hub has a | |
517 | * transaction translator built in. | |
518 | */ | |
519 | if ((temp & (PORT_PE|PORT_CONNECT)) == PORT_CONNECT | |
520 | && !ehci_is_TDI(ehci) | |
521 | && PORT_USB11 (temp)) { | |
522 | ehci_dbg (ehci, | |
523 | "port %d low speed --> companion\n", | |
524 | wIndex + 1); | |
525 | temp |= PORT_OWNER; | |
526 | } else { | |
527 | ehci_vdbg (ehci, "port %d reset\n", wIndex + 1); | |
528 | temp |= PORT_RESET; | |
529 | temp &= ~PORT_PE; | |
530 | ||
531 | /* | |
532 | * caller must wait, then call GetPortStatus | |
533 | * usb 2.0 spec says 50 ms resets on root | |
534 | */ | |
535 | ehci->reset_done [wIndex] = jiffies | |
536 | + msecs_to_jiffies (50); | |
537 | } | |
538 | writel (temp, &ehci->regs->port_status [wIndex]); | |
539 | break; | |
540 | default: | |
541 | goto error; | |
542 | } | |
543 | readl (&ehci->regs->command); /* unblock posted writes */ | |
544 | break; | |
545 | ||
546 | default: | |
547 | error: | |
548 | /* "stall" on error */ | |
549 | retval = -EPIPE; | |
550 | } | |
551 | spin_unlock_irqrestore (&ehci->lock, flags); | |
552 | return retval; | |
553 | } |