Commit | Line | Data |
---|---|---|
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 |
42 | static void dl_done_list (struct ohci_hcd *); |
43 | static void finish_unlinks (struct ohci_hcd *, u16); | |
1da177e4 | 44 | |
b1878440 | 45 | #ifdef CONFIG_PM |
8d1a243b AS |
46 | static 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 LT |
92 | |
93 | /* maybe resume can wake root hub */ | |
58a97ffe | 94 | if (ohci_to_hcd(ohci)->self.root_hub->do_remote_wakeup || autostop) { |
1da177e4 | 95 | ohci->hc_control |= OHCI_CTRL_RWE; |
58a97ffe | 96 | } else { |
5f47493c AS |
97 | ohci_writel(ohci, OHCI_INTR_RHSC | OHCI_INTR_RD, |
98 | &ohci->regs->intrdisable); | |
1da177e4 | 99 | ohci->hc_control &= ~OHCI_CTRL_RWE; |
1f7e1a3b | 100 | } |
1da177e4 | 101 | |
f197b2c5 DB |
102 | /* Suspend hub ... this is the "global (to this bus) suspend" mode, |
103 | * which doesn't imply ports will first be individually suspended. | |
104 | */ | |
1da177e4 LT |
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 */ | |
8d1a243b AS |
111 | if (!autostop) { |
112 | ohci->next_statechange = jiffies + msecs_to_jiffies (5); | |
113 | ohci->autostop = 0; | |
114 | } | |
d413984a | 115 | |
1da177e4 | 116 | done: |
1da177e4 LT |
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 */ | |
8d1a243b AS |
129 | static int ohci_rh_resume (struct ohci_hcd *ohci) |
130 | __releases(ohci->lock) | |
131 | __acquires(ohci->lock) | |
1da177e4 | 132 | { |
8d1a243b | 133 | struct usb_hcd *hcd = ohci_to_hcd (ohci); |
1da177e4 LT |
134 | u32 temp, enables; |
135 | int status = -EINPROGRESS; | |
8d1a243b | 136 | int autostopped = ohci->autostop; |
8de98402 | 137 | |
8d1a243b | 138 | ohci->autostop = 0; |
1da177e4 LT |
139 | ohci->hc_control = ohci_readl (ohci, &ohci->regs->control); |
140 | ||
141 | if (ohci->hc_control & (OHCI_CTRL_IR | OHCI_SCHED_ENABLES)) { | |
f197b2c5 | 142 | /* this can happen after resuming a swsusp snapshot */ |
1da177e4 LT |
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); | |
8d1a243b AS |
158 | ohci_dbg (ohci, "%s root hub\n", |
159 | autostopped ? "auto-start" : "resume"); | |
1da177e4 LT |
160 | break; |
161 | case OHCI_USB_RESUME: | |
162 | /* HCFS changes sometime after INTR_RD */ | |
1b7be3c0 | 163 | ohci_dbg(ohci, "%swakeup root hub\n", |
583ceada | 164 | autostopped ? "auto-" : ""); |
1da177e4 LT |
165 | break; |
166 | case OHCI_USB_OPER: | |
f197b2c5 DB |
167 | /* this can happen after resuming a swsusp snapshot */ |
168 | ohci_dbg (ohci, "snapshot resume? reinit\n"); | |
169 | status = -EBUSY; | |
1da177e4 LT |
170 | break; |
171 | default: /* RESET, we lost power */ | |
f197b2c5 | 172 | ohci_dbg (ohci, "lost power\n"); |
1da177e4 LT |
173 | status = -EBUSY; |
174 | } | |
1da177e4 | 175 | if (status == -EBUSY) { |
8d1a243b | 176 | if (!autostopped) { |
8d1a243b AS |
177 | spin_unlock_irq (&ohci->lock); |
178 | (void) ohci_init (ohci); | |
179 | status = ohci_restart (ohci); | |
d576bb9f MH |
180 | |
181 | usb_root_hub_lost_power(hcd->self.root_hub); | |
182 | ||
8d1a243b AS |
183 | spin_lock_irq (&ohci->lock); |
184 | } | |
185 | return status; | |
1da177e4 LT |
186 | } |
187 | if (status != -EINPROGRESS) | |
188 | return status; | |
8d1a243b AS |
189 | if (autostopped) |
190 | goto skip_resume; | |
191 | spin_unlock_irq (&ohci->lock); | |
1da177e4 | 192 | |
1da177e4 | 193 | /* Some controllers (lucent erratum) need extra-long delays */ |
f197b2c5 | 194 | msleep (20 /* usb 11.5.1.10 */ + 12 /* 32 msec counter */ + 1); |
1da177e4 LT |
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"); | |
565402ba | 200 | spin_lock_irq(&ohci->lock); |
1da177e4 LT |
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 | ||
8d1a243b AS |
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: | |
1da177e4 LT |
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); | |
1da177e4 LT |
224 | |
225 | /* Then re-enable operations */ | |
226 | ohci_writel (ohci, OHCI_USB_OPER, &ohci->regs->control); | |
227 | (void) ohci_readl (ohci, &ohci->regs->control); | |
8d1a243b AS |
228 | if (!autostopped) |
229 | msleep (3); | |
1da177e4 | 230 | |
6a9062f3 DB |
231 | temp = ohci->hc_control; |
232 | temp &= OHCI_CTRL_RWC; | |
233 | temp |= OHCI_CONTROL_INIT | OHCI_USB_OPER; | |
1da177e4 LT |
234 | ohci->hc_control = temp; |
235 | ohci_writel (ohci, temp, &ohci->regs->control); | |
236 | (void) ohci_readl (ohci, &ohci->regs->control); | |
237 | ||
238 | /* TRSMRCY */ | |
8d1a243b AS |
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 */ | |
1da177e4 | 244 | |
d413984a DB |
245 | /* keep it alive for more than ~5x suspend + resume costs */ |
246 | ohci->next_statechange = jiffies + STATECHANGE_DELAY; | |
1da177e4 LT |
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 | ||
1da177e4 LT |
277 | return 0; |
278 | } | |
279 | ||
8d1a243b AS |
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 | ||
43bbb7e0 AS |
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 | ||
1f9fc882 AS |
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) | |
363 | { | |
364 | int poll_rh = 1; | |
b5fb454f | 365 | int rhsc; |
1f9fc882 | 366 | |
b5fb454f | 367 | rhsc = ohci_readl(ohci, &ohci->regs->intrenable) & OHCI_INTR_RHSC; |
1f9fc882 AS |
368 | switch (ohci->hc_control & OHCI_CTRL_HCFS) { |
369 | ||
370 | case OHCI_USB_OPER: | |
b5fb454f AS |
371 | /* If no status changes are pending, enable status-change |
372 | * interrupts. | |
373 | */ | |
374 | if (!rhsc && !changed) { | |
375 | rhsc = OHCI_INTR_RHSC; | |
376 | ohci_writel(ohci, rhsc, &ohci->regs->intrenable); | |
377 | } | |
378 | ||
379 | /* Keep on polling until we know a device is connected | |
380 | * and RHSC is enabled, or until we autostop. | |
381 | */ | |
1f9fc882 AS |
382 | if (!ohci->autostop) { |
383 | if (any_connected || | |
384 | !device_may_wakeup(&ohci_to_hcd(ohci) | |
385 | ->self.root_hub->dev)) { | |
b5fb454f | 386 | if (rhsc) |
1f9fc882 AS |
387 | poll_rh = 0; |
388 | } else { | |
389 | ohci->autostop = 1; | |
390 | ohci->next_statechange = jiffies + HZ; | |
391 | } | |
392 | ||
393 | /* if no devices have been attached for one second, autostop */ | |
394 | } else { | |
395 | if (changed || any_connected) { | |
396 | ohci->autostop = 0; | |
397 | ohci->next_statechange = jiffies + | |
398 | STATECHANGE_DELAY; | |
b5fb454f | 399 | } else if (rhsc && time_after_eq(jiffies, |
1f9fc882 AS |
400 | ohci->next_statechange) |
401 | && !ohci->ed_rm_list | |
402 | && !(ohci->hc_control & | |
403 | OHCI_SCHED_ENABLES)) { | |
404 | ohci_rh_suspend(ohci, 1); | |
b5fb454f | 405 | poll_rh = 0; |
1f9fc882 AS |
406 | } |
407 | } | |
408 | break; | |
409 | ||
410 | /* if there is a port change, autostart or ask to be resumed */ | |
411 | case OHCI_USB_SUSPEND: | |
412 | case OHCI_USB_RESUME: | |
413 | if (changed) { | |
414 | if (ohci->autostop) | |
415 | ohci_rh_resume(ohci); | |
416 | else | |
417 | usb_hcd_resume_root_hub(ohci_to_hcd(ohci)); | |
418 | } else { | |
b5fb454f AS |
419 | if (!rhsc && (ohci->autostop || |
420 | ohci_to_hcd(ohci)->self.root_hub-> | |
421 | do_remote_wakeup)) | |
422 | ohci_writel(ohci, OHCI_INTR_RHSC, | |
423 | &ohci->regs->intrenable); | |
424 | ||
1f9fc882 AS |
425 | /* everything is idle, no need for polling */ |
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) | |
445 | { | |
b5fb454f | 446 | /* If RHSC is enabled, don't poll */ |
09ca8adb | 447 | if (ohci_readl(ohci, &ohci->regs->intrenable) & OHCI_INTR_RHSC) |
b5fb454f AS |
448 | return 0; |
449 | ||
450 | /* If no status changes are pending, enable status-change interrupts */ | |
451 | if (!changed) { | |
452 | ohci_writel(ohci, OHCI_INTR_RHSC, &ohci->regs->intrenable); | |
453 | return 0; | |
454 | } | |
455 | return 1; | |
1f9fc882 AS |
456 | } |
457 | ||
8ad7fe16 | 458 | #endif /* CONFIG_PM */ |
1da177e4 LT |
459 | |
460 | /*-------------------------------------------------------------------------*/ | |
461 | ||
462 | /* build "status change" packet (one or two bytes) from HC registers */ | |
463 | ||
464 | static int | |
465 | ohci_hub_status_data (struct usb_hcd *hcd, char *buf) | |
466 | { | |
467 | struct ohci_hcd *ohci = hcd_to_ohci (hcd); | |
fdd13b36 | 468 | int i, changed = 0, length = 1; |
052ac01a | 469 | int any_connected = 0; |
1da177e4 LT |
470 | unsigned long flags; |
471 | ||
472 | spin_lock_irqsave (&ohci->lock, flags); | |
6fd75b19 AS |
473 | if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)) |
474 | goto done; | |
1da177e4 | 475 | |
fdd13b36 DB |
476 | /* undocumented erratum seen on at least rev D */ |
477 | if ((ohci->flags & OHCI_QUIRK_AMD756) | |
478 | && (roothub_a (ohci) & RH_A_NDP) > MAX_ROOT_PORTS) { | |
479 | ohci_warn (ohci, "bogus NDP, rereads as NDP=%d\n", | |
1da177e4 LT |
480 | ohci_readl (ohci, &ohci->regs->roothub.a) & RH_A_NDP); |
481 | /* retry later; "should not happen" */ | |
482 | goto done; | |
483 | } | |
484 | ||
485 | /* init status */ | |
486 | if (roothub_status (ohci) & (RH_HS_LPSC | RH_HS_OCIC)) | |
487 | buf [0] = changed = 1; | |
488 | else | |
489 | buf [0] = 0; | |
fdd13b36 | 490 | if (ohci->num_ports > 7) { |
1da177e4 LT |
491 | buf [1] = 0; |
492 | length++; | |
493 | } | |
494 | ||
38b375d9 AS |
495 | /* Some broken controllers never turn off RHCS in the interrupt |
496 | * status register. For their sake we won't re-enable RHSC | |
497 | * interrupts if the flag is already set. | |
498 | */ | |
499 | if (ohci_readl(ohci, &ohci->regs->intrstatus) & OHCI_INTR_RHSC) | |
500 | changed = 1; | |
501 | ||
1da177e4 | 502 | /* look at each port */ |
fdd13b36 | 503 | for (i = 0; i < ohci->num_ports; i++) { |
1da177e4 LT |
504 | u32 status = roothub_portstatus (ohci, i); |
505 | ||
8d1a243b AS |
506 | /* can't autostop if ports are connected */ |
507 | any_connected |= (status & RH_PS_CCS); | |
508 | ||
1da177e4 LT |
509 | if (status & (RH_PS_CSC | RH_PS_PESC | RH_PS_PSSC |
510 | | RH_PS_OCIC | RH_PS_PRSC)) { | |
511 | changed = 1; | |
512 | if (i < 7) | |
513 | buf [0] |= 1 << (i + 1); | |
514 | else | |
515 | buf [1] |= 1 << (i - 7); | |
1da177e4 | 516 | } |
d413984a | 517 | } |
1da177e4 | 518 | |
1f9fc882 AS |
519 | hcd->poll_rh = ohci_root_hub_state_changes(ohci, changed, |
520 | any_connected); | |
d413984a | 521 | |
1da177e4 LT |
522 | done: |
523 | spin_unlock_irqrestore (&ohci->lock, flags); | |
524 | ||
1da177e4 LT |
525 | return changed ? length : 0; |
526 | } | |
527 | ||
528 | /*-------------------------------------------------------------------------*/ | |
529 | ||
530 | static void | |
531 | ohci_hub_descriptor ( | |
532 | struct ohci_hcd *ohci, | |
533 | struct usb_hub_descriptor *desc | |
534 | ) { | |
535 | u32 rh = roothub_a (ohci); | |
1da177e4 LT |
536 | u16 temp; |
537 | ||
538 | desc->bDescriptorType = 0x29; | |
539 | desc->bPwrOn2PwrGood = (rh & RH_A_POTPGT) >> 24; | |
540 | desc->bHubContrCurrent = 0; | |
541 | ||
fdd13b36 DB |
542 | desc->bNbrPorts = ohci->num_ports; |
543 | temp = 1 + (ohci->num_ports / 8); | |
1da177e4 LT |
544 | desc->bDescLength = 7 + 2 * temp; |
545 | ||
546 | temp = 0; | |
547 | if (rh & RH_A_NPS) /* no power switching? */ | |
548 | temp |= 0x0002; | |
dd9048af | 549 | if (rh & RH_A_PSM) /* per-port power switching? */ |
1da177e4 LT |
550 | temp |= 0x0001; |
551 | if (rh & RH_A_NOCP) /* no overcurrent reporting? */ | |
552 | temp |= 0x0010; | |
553 | else if (rh & RH_A_OCPM) /* per-port overcurrent reporting? */ | |
554 | temp |= 0x0008; | |
555 | desc->wHubCharacteristics = (__force __u16)cpu_to_hc16(ohci, temp); | |
556 | ||
557 | /* two bitmaps: ports removable, and usb 1.0 legacy PortPwrCtrlMask */ | |
558 | rh = roothub_b (ohci); | |
b2134bcd | 559 | memset(desc->bitmap, 0xff, sizeof(desc->bitmap)); |
1da177e4 | 560 | desc->bitmap [0] = rh & RH_B_DR; |
fdd13b36 | 561 | if (ohci->num_ports > 7) { |
1da177e4 | 562 | desc->bitmap [1] = (rh & RH_B_DR) >> 8; |
b2134bcd | 563 | desc->bitmap [2] = 0xff; |
1da177e4 LT |
564 | } else |
565 | desc->bitmap [1] = 0xff; | |
566 | } | |
567 | ||
568 | /*-------------------------------------------------------------------------*/ | |
569 | ||
570 | #ifdef CONFIG_USB_OTG | |
571 | ||
572 | static int ohci_start_port_reset (struct usb_hcd *hcd, unsigned port) | |
573 | { | |
574 | struct ohci_hcd *ohci = hcd_to_ohci (hcd); | |
575 | u32 status; | |
576 | ||
577 | if (!port) | |
578 | return -EINVAL; | |
579 | port--; | |
580 | ||
581 | /* start port reset before HNP protocol times out */ | |
582 | status = ohci_readl(ohci, &ohci->regs->roothub.portstatus [port]); | |
583 | if (!(status & RH_PS_CCS)) | |
584 | return -ENODEV; | |
585 | ||
586 | /* khubd will finish the reset later */ | |
587 | ohci_writel(ohci, RH_PS_PRS, &ohci->regs->roothub.portstatus [port]); | |
588 | return 0; | |
589 | } | |
590 | ||
1da177e4 LT |
591 | #else |
592 | ||
593 | #define ohci_start_port_reset NULL | |
594 | ||
595 | #endif | |
596 | ||
597 | /*-------------------------------------------------------------------------*/ | |
598 | ||
599 | ||
600 | /* See usb 7.1.7.5: root hubs must issue at least 50 msec reset signaling, | |
601 | * not necessarily continuous ... to guard against resume signaling. | |
602 | * The short timeout is safe for non-root hubs, and is backward-compatible | |
603 | * with earlier Linux hosts. | |
604 | */ | |
605 | #ifdef CONFIG_USB_SUSPEND | |
606 | #define PORT_RESET_MSEC 50 | |
607 | #else | |
608 | #define PORT_RESET_MSEC 10 | |
609 | #endif | |
610 | ||
611 | /* this timer value might be vendor-specific ... */ | |
612 | #define PORT_RESET_HW_MSEC 10 | |
613 | ||
614 | /* wrap-aware logic morphed from <linux/jiffies.h> */ | |
615 | #define tick_before(t1,t2) ((s16)(((s16)(t1))-((s16)(t2))) < 0) | |
616 | ||
617 | /* called from some task, normally khubd */ | |
23d10a9e | 618 | static inline int root_port_reset (struct ohci_hcd *ohci, unsigned port) |
1da177e4 LT |
619 | { |
620 | __hc32 __iomem *portstat = &ohci->regs->roothub.portstatus [port]; | |
1b7b61c5 | 621 | u32 temp = 0; |
1da177e4 LT |
622 | u16 now = ohci_readl(ohci, &ohci->regs->fmnumber); |
623 | u16 reset_done = now + PORT_RESET_MSEC; | |
e01e7fe3 | 624 | int limit_1 = DIV_ROUND_UP(PORT_RESET_MSEC, PORT_RESET_HW_MSEC); |
1da177e4 LT |
625 | |
626 | /* build a "continuous enough" reset signal, with up to | |
627 | * 3msec gap between pulses. scheduler HZ==100 must work; | |
628 | * this might need to be deadline-scheduled. | |
629 | */ | |
630 | do { | |
e01e7fe3 DB |
631 | int limit_2; |
632 | ||
1da177e4 | 633 | /* spin until any current reset finishes */ |
e01e7fe3 DB |
634 | limit_2 = PORT_RESET_HW_MSEC * 2; |
635 | while (--limit_2 >= 0) { | |
1da177e4 | 636 | temp = ohci_readl (ohci, portstat); |
23d10a9e TO |
637 | /* handle e.g. CardBus eject */ |
638 | if (temp == ~(u32)0) | |
639 | return -ESHUTDOWN; | |
1da177e4 LT |
640 | if (!(temp & RH_PS_PRS)) |
641 | break; | |
642 | udelay (500); | |
dd9048af | 643 | } |
1da177e4 | 644 | |
e01e7fe3 DB |
645 | /* timeout (a hardware error) has been observed when |
646 | * EHCI sets CF while this driver is resetting a port; | |
647 | * presumably other disconnect paths might do it too. | |
648 | */ | |
649 | if (limit_2 < 0) { | |
650 | ohci_dbg(ohci, | |
651 | "port[%d] reset timeout, stat %08x\n", | |
652 | port, temp); | |
653 | break; | |
654 | } | |
655 | ||
1da177e4 LT |
656 | if (!(temp & RH_PS_CCS)) |
657 | break; | |
658 | if (temp & RH_PS_PRSC) | |
659 | ohci_writel (ohci, RH_PS_PRSC, portstat); | |
660 | ||
661 | /* start the next reset, sleep till it's probably done */ | |
662 | ohci_writel (ohci, RH_PS_PRS, portstat); | |
663 | msleep(PORT_RESET_HW_MSEC); | |
664 | now = ohci_readl(ohci, &ohci->regs->fmnumber); | |
e01e7fe3 DB |
665 | } while (tick_before(now, reset_done) && --limit_1 >= 0); |
666 | ||
667 | /* caller synchronizes using PRSC ... and handles PRS | |
668 | * still being set when this returns. | |
669 | */ | |
23d10a9e TO |
670 | |
671 | return 0; | |
1da177e4 LT |
672 | } |
673 | ||
674 | static int ohci_hub_control ( | |
675 | struct usb_hcd *hcd, | |
676 | u16 typeReq, | |
677 | u16 wValue, | |
678 | u16 wIndex, | |
679 | char *buf, | |
680 | u16 wLength | |
681 | ) { | |
682 | struct ohci_hcd *ohci = hcd_to_ohci (hcd); | |
683 | int ports = hcd_to_bus (hcd)->root_hub->maxchild; | |
684 | u32 temp; | |
685 | int retval = 0; | |
686 | ||
8de98402 BH |
687 | if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags))) |
688 | return -ESHUTDOWN; | |
689 | ||
1da177e4 LT |
690 | switch (typeReq) { |
691 | case ClearHubFeature: | |
692 | switch (wValue) { | |
693 | case C_HUB_OVER_CURRENT: | |
694 | ohci_writel (ohci, RH_HS_OCIC, | |
695 | &ohci->regs->roothub.status); | |
696 | case C_HUB_LOCAL_POWER: | |
697 | break; | |
698 | default: | |
699 | goto error; | |
700 | } | |
701 | break; | |
702 | case ClearPortFeature: | |
703 | if (!wIndex || wIndex > ports) | |
704 | goto error; | |
705 | wIndex--; | |
706 | ||
707 | switch (wValue) { | |
708 | case USB_PORT_FEAT_ENABLE: | |
709 | temp = RH_PS_CCS; | |
710 | break; | |
711 | case USB_PORT_FEAT_C_ENABLE: | |
712 | temp = RH_PS_PESC; | |
713 | break; | |
714 | case USB_PORT_FEAT_SUSPEND: | |
715 | temp = RH_PS_POCI; | |
1da177e4 LT |
716 | break; |
717 | case USB_PORT_FEAT_C_SUSPEND: | |
718 | temp = RH_PS_PSSC; | |
719 | break; | |
720 | case USB_PORT_FEAT_POWER: | |
721 | temp = RH_PS_LSDA; | |
722 | break; | |
723 | case USB_PORT_FEAT_C_CONNECTION: | |
724 | temp = RH_PS_CSC; | |
725 | break; | |
726 | case USB_PORT_FEAT_C_OVER_CURRENT: | |
727 | temp = RH_PS_OCIC; | |
728 | break; | |
729 | case USB_PORT_FEAT_C_RESET: | |
730 | temp = RH_PS_PRSC; | |
731 | break; | |
732 | default: | |
733 | goto error; | |
734 | } | |
735 | ohci_writel (ohci, temp, | |
736 | &ohci->regs->roothub.portstatus [wIndex]); | |
737 | // ohci_readl (ohci, &ohci->regs->roothub.portstatus [wIndex]); | |
738 | break; | |
739 | case GetHubDescriptor: | |
740 | ohci_hub_descriptor (ohci, (struct usb_hub_descriptor *) buf); | |
741 | break; | |
742 | case GetHubStatus: | |
743 | temp = roothub_status (ohci) & ~(RH_HS_CRWE | RH_HS_DRWE); | |
a5abdeaf | 744 | put_unaligned_le32(temp, buf); |
1da177e4 LT |
745 | break; |
746 | case GetPortStatus: | |
747 | if (!wIndex || wIndex > ports) | |
748 | goto error; | |
749 | wIndex--; | |
750 | temp = roothub_portstatus (ohci, wIndex); | |
a5abdeaf | 751 | put_unaligned_le32(temp, buf); |
1da177e4 LT |
752 | |
753 | #ifndef OHCI_VERBOSE_DEBUG | |
754 | if (*(u16*)(buf+2)) /* only if wPortChange is interesting */ | |
755 | #endif | |
756 | dbg_port (ohci, "GetStatus", wIndex, temp); | |
757 | break; | |
758 | case SetHubFeature: | |
759 | switch (wValue) { | |
760 | case C_HUB_OVER_CURRENT: | |
761 | // FIXME: this can be cleared, yes? | |
762 | case C_HUB_LOCAL_POWER: | |
763 | break; | |
764 | default: | |
765 | goto error; | |
766 | } | |
767 | break; | |
768 | case SetPortFeature: | |
769 | if (!wIndex || wIndex > ports) | |
770 | goto error; | |
771 | wIndex--; | |
772 | switch (wValue) { | |
773 | case USB_PORT_FEAT_SUSPEND: | |
774 | #ifdef CONFIG_USB_OTG | |
775 | if (hcd->self.otg_port == (wIndex + 1) | |
776 | && hcd->self.b_hnp_enable) | |
e8b24450 | 777 | ohci->start_hnp(ohci); |
1da177e4 LT |
778 | else |
779 | #endif | |
780 | ohci_writel (ohci, RH_PS_PSS, | |
781 | &ohci->regs->roothub.portstatus [wIndex]); | |
782 | break; | |
783 | case USB_PORT_FEAT_POWER: | |
784 | ohci_writel (ohci, RH_PS_PPS, | |
785 | &ohci->regs->roothub.portstatus [wIndex]); | |
786 | break; | |
787 | case USB_PORT_FEAT_RESET: | |
23d10a9e | 788 | retval = root_port_reset (ohci, wIndex); |
1da177e4 LT |
789 | break; |
790 | default: | |
791 | goto error; | |
792 | } | |
793 | break; | |
794 | ||
795 | default: | |
796 | error: | |
797 | /* "protocol stall" on error */ | |
798 | retval = -EPIPE; | |
799 | } | |
800 | return retval; | |
801 | } | |
802 |