blob: 2347ab83f046f7c7ce561aaec5562f47399efd59 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * OHCI HCD (Host Controller Driver) for USB.
David Brownelldd9048a2006-12-05 03:18:31 -08003 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
5 * (C) Copyright 2000-2004 David Brownell <dbrownell@users.sourceforge.net>
David Brownelldd9048a2006-12-05 03:18:31 -08006 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 * 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" : "", \
David Brownelldd9048a2006-12-05 03:18:31 -080026 \
Linus Torvalds1da177e2005-04-16 15:20:36 -070027 (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" : "", \
David Brownelldd9048a2006-12-05 03:18:31 -080032 \
Linus Torvalds1da177e2005-04-16 15:20:36 -070033 (temp & RH_PS_PES) ? " PES" : "", \
34 (temp & RH_PS_CCS) ? " CCS" : "" \
35 );
36
37/*-------------------------------------------------------------------------*/
38
Linus Torvalds1da177e2005-04-16 15:20:36 -070039#define OHCI_SCHED_ENABLES \
40 (OHCI_CTRL_CLE|OHCI_CTRL_BLE|OHCI_CTRL_PLE|OHCI_CTRL_IE)
41
David Howells7d12e782006-10-05 14:55:46 +010042static void dl_done_list (struct ohci_hcd *);
43static void finish_unlinks (struct ohci_hcd *, u16);
Linus Torvalds1da177e2005-04-16 15:20:36 -070044
Alan Sternb1878442006-10-24 12:02:31 -040045#ifdef CONFIG_PM
Alan Stern8d1a2432006-09-26 14:46:16 -040046static int ohci_rh_suspend (struct ohci_hcd *ohci, int autostop)
47__releases(ohci->lock)
48__acquires(ohci->lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -070049{
Linus Torvalds1da177e2005-04-16 15:20:36 -070050 int status = 0;
Benjamin Herrenschmidt8de98402005-11-25 09:59:46 +110051
Linus Torvalds1da177e2005-04-16 15:20:36 -070052 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:
Alan Stern8d1a2432006-09-26 14:46:16 -040066 if (!ohci->autostop) {
67 ohci_dbg (ohci, "already suspended\n");
68 goto done;
69 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070070 }
Alan Stern8d1a2432006-09-26 14:46:16 -040071 ohci_dbg (ohci, "%s root hub\n",
72 autostop ? "auto-stop" : "suspend");
Linus Torvalds1da177e2005-04-16 15:20:36 -070073
74 /* First stop any processing */
Alan Stern8d1a2432006-09-26 14:46:16 -040075 if (!autostop && (ohci->hc_control & OHCI_SCHED_ENABLES)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070076 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");
Alan Stern8d1a2432006-09-26 14:46:16 -040085 ohci->autostop = 0;
86 spin_unlock_irq (&ohci->lock);
87 msleep (8);
88 spin_lock_irq (&ohci->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070089 }
David Howells7d12e782006-10-05 14:55:46 +010090 dl_done_list (ohci);
91 finish_unlinks (ohci, ohci_frame_no(ohci));
Linus Torvalds1da177e2005-04-16 15:20:36 -070092
93 /* maybe resume can wake root hub */
Alan Stern58a97ff2008-04-14 12:17:10 -040094 if (ohci_to_hcd(ohci)->self.root_hub->do_remote_wakeup || autostop) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070095 ohci->hc_control |= OHCI_CTRL_RWE;
Alan Stern58a97ff2008-04-14 12:17:10 -040096 } else {
Alan Stern5f474932008-04-14 12:17:49 -040097 ohci_writel(ohci, OHCI_INTR_RHSC | OHCI_INTR_RD,
98 &ohci->regs->intrdisable);
Linus Torvalds1da177e2005-04-16 15:20:36 -070099 ohci->hc_control &= ~OHCI_CTRL_RWE;
Alan Stern1f7e1a32006-09-25 15:41:21 -0400100 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101
David Brownellf197b2c2005-09-22 22:42:53 -0700102 /* Suspend hub ... this is the "global (to this bus) suspend" mode,
103 * which doesn't imply ports will first be individually suspended.
104 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105 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 */
Alan Stern8d1a2432006-09-26 14:46:16 -0400111 if (!autostop) {
112 ohci->next_statechange = jiffies + msecs_to_jiffies (5);
113 ohci->autostop = 0;
Alan Sternb7463c72011-11-17 16:41:56 -0500114 ohci->rh_state = OHCI_RH_SUSPENDED;
Alan Stern8d1a2432006-09-26 14:46:16 -0400115 }
David Brownelld4139842006-08-04 11:31:55 -0700116
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117done:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118 return status;
119}
120
121static inline struct ed *find_head (struct ed *ed)
122{
123 /* for bulk and control lists */
124 while (ed->ed_prev)
125 ed = ed->ed_prev;
126 return ed;
127}
128
129/* caller has locked the root hub */
Alan Stern8d1a2432006-09-26 14:46:16 -0400130static int ohci_rh_resume (struct ohci_hcd *ohci)
131__releases(ohci->lock)
132__acquires(ohci->lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133{
Alan Stern8d1a2432006-09-26 14:46:16 -0400134 struct usb_hcd *hcd = ohci_to_hcd (ohci);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135 u32 temp, enables;
136 int status = -EINPROGRESS;
Alan Stern8d1a2432006-09-26 14:46:16 -0400137 int autostopped = ohci->autostop;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138
Alan Stern8d1a2432006-09-26 14:46:16 -0400139 ohci->autostop = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140 ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
141
142 if (ohci->hc_control & (OHCI_CTRL_IR | OHCI_SCHED_ENABLES)) {
David Brownellf197b2c2005-09-22 22:42:53 -0700143 /* this can happen after resuming a swsusp snapshot */
Alan Sternb7463c72011-11-17 16:41:56 -0500144 if (ohci->rh_state != OHCI_RH_RUNNING) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 ohci_dbg (ohci, "BIOS/SMM active, control %03x\n",
146 ohci->hc_control);
147 status = -EBUSY;
148 /* this happens when pmcore resumes HC then root */
149 } else {
150 ohci_dbg (ohci, "duplicate resume\n");
151 status = 0;
152 }
153 } else switch (ohci->hc_control & OHCI_CTRL_HCFS) {
154 case OHCI_USB_SUSPEND:
155 ohci->hc_control &= ~(OHCI_CTRL_HCFS|OHCI_SCHED_ENABLES);
156 ohci->hc_control |= OHCI_USB_RESUME;
157 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
158 (void) ohci_readl (ohci, &ohci->regs->control);
Alan Stern8d1a2432006-09-26 14:46:16 -0400159 ohci_dbg (ohci, "%s root hub\n",
160 autostopped ? "auto-start" : "resume");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161 break;
162 case OHCI_USB_RESUME:
163 /* HCFS changes sometime after INTR_RD */
Alan Stern1b7be3c2006-11-06 12:05:00 -0500164 ohci_dbg(ohci, "%swakeup root hub\n",
Alan Stern583cead2006-10-24 12:04:22 -0400165 autostopped ? "auto-" : "");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166 break;
167 case OHCI_USB_OPER:
David Brownellf197b2c2005-09-22 22:42:53 -0700168 /* this can happen after resuming a swsusp snapshot */
169 ohci_dbg (ohci, "snapshot resume? reinit\n");
170 status = -EBUSY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171 break;
172 default: /* RESET, we lost power */
David Brownellf197b2c2005-09-22 22:42:53 -0700173 ohci_dbg (ohci, "lost power\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174 status = -EBUSY;
175 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176 if (status == -EBUSY) {
Alan Stern8d1a2432006-09-26 14:46:16 -0400177 if (!autostopped) {
Alan Stern8d1a2432006-09-26 14:46:16 -0400178 spin_unlock_irq (&ohci->lock);
Alan Stern8d1a2432006-09-26 14:46:16 -0400179 status = ohci_restart (ohci);
Michael Hanselmannd576bb92007-05-31 23:34:27 +0200180
181 usb_root_hub_lost_power(hcd->self.root_hub);
182
Alan Stern8d1a2432006-09-26 14:46:16 -0400183 spin_lock_irq (&ohci->lock);
184 }
185 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 }
187 if (status != -EINPROGRESS)
188 return status;
Alan Stern8d1a2432006-09-26 14:46:16 -0400189 if (autostopped)
190 goto skip_resume;
191 spin_unlock_irq (&ohci->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 /* Some controllers (lucent erratum) need extra-long delays */
David Brownellf197b2c2005-09-22 22:42:53 -0700194 msleep (20 /* usb 11.5.1.10 */ + 12 /* 32 msec counter */ + 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195
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");
Alan Stern565402b2006-10-27 10:35:01 -0400200 spin_lock_irq(&ohci->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201 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
Alan Stern8d1a2432006-09-26 14:46:16 -0400215 /* the following code is executed with ohci->lock held and
216 * irqs disabled if and only if autostopped is true
217 */
218
219skip_resume:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220 /* 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224
225 /* Then re-enable operations */
226 ohci_writel (ohci, OHCI_USB_OPER, &ohci->regs->control);
227 (void) ohci_readl (ohci, &ohci->regs->control);
Alan Stern8d1a2432006-09-26 14:46:16 -0400228 if (!autostopped)
229 msleep (3);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230
David Brownell6a9062f2006-01-23 15:28:07 -0800231 temp = ohci->hc_control;
232 temp &= OHCI_CTRL_RWC;
233 temp |= OHCI_CONTROL_INIT | OHCI_USB_OPER;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234 ohci->hc_control = temp;
235 ohci_writel (ohci, temp, &ohci->regs->control);
236 (void) ohci_readl (ohci, &ohci->regs->control);
237
238 /* TRSMRCY */
Alan Stern8d1a2432006-09-26 14:46:16 -0400239 if (!autostopped) {
240 msleep (10);
241 spin_lock_irq (&ohci->lock);
242 }
243 /* now ohci->lock is always held and irqs are always disabled */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244
David Brownelld4139842006-08-04 11:31:55 -0700245 /* keep it alive for more than ~5x suspend + resume costs */
246 ohci->next_statechange = jiffies + STATECHANGE_DELAY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247
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
Alan Sternb7463c72011-11-17 16:41:56 -0500277 ohci->rh_state = OHCI_RH_RUNNING;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278 return 0;
279}
280
Alan Stern8d1a2432006-09-26 14:46:16 -0400281static int ohci_bus_suspend (struct usb_hcd *hcd)
282{
283 struct ohci_hcd *ohci = hcd_to_ohci (hcd);
284 int rc;
285
286 spin_lock_irq (&ohci->lock);
287
Alan Stern541c7d42010-06-22 16:39:10 -0400288 if (unlikely(!HCD_HW_ACCESSIBLE(hcd)))
Alan Stern8d1a2432006-09-26 14:46:16 -0400289 rc = -ESHUTDOWN;
290 else
291 rc = ohci_rh_suspend (ohci, 0);
292 spin_unlock_irq (&ohci->lock);
293 return rc;
294}
295
296static int ohci_bus_resume (struct usb_hcd *hcd)
297{
298 struct ohci_hcd *ohci = hcd_to_ohci (hcd);
299 int rc;
300
301 if (time_before (jiffies, ohci->next_statechange))
302 msleep(5);
303
304 spin_lock_irq (&ohci->lock);
305
Alan Stern541c7d42010-06-22 16:39:10 -0400306 if (unlikely(!HCD_HW_ACCESSIBLE(hcd)))
Alan Stern8d1a2432006-09-26 14:46:16 -0400307 rc = -ESHUTDOWN;
308 else
309 rc = ohci_rh_resume (ohci);
310 spin_unlock_irq (&ohci->lock);
311
312 /* poll until we know a device is connected or we autostop */
313 if (rc == 0)
314 usb_hcd_poll_rh_status(hcd);
315 return rc;
316}
317
Alan Stern1f9fc882006-11-20 11:06:59 -0500318/* Carry out polling-, autostop-, and autoresume-related state changes */
319static int ohci_root_hub_state_changes(struct ohci_hcd *ohci, int changed,
Alan Stern71b74972008-10-09 15:40:23 -0400320 int any_connected, int rhsc_status)
Alan Stern1f9fc882006-11-20 11:06:59 -0500321{
322 int poll_rh = 1;
Alan Stern71b74972008-10-09 15:40:23 -0400323 int rhsc_enable;
Alan Stern1f9fc882006-11-20 11:06:59 -0500324
Alan Sternee0b9be2010-06-25 14:02:24 -0400325 /* Some broken controllers never turn off RHSC in the interrupt
Alan Stern4a511bc2008-09-03 16:38:32 -0400326 * status register. For their sake we won't re-enable RHSC
327 * interrupts if the interrupt bit is already active.
328 */
Alan Stern4a511bc2008-09-03 16:38:32 -0400329 rhsc_enable = ohci_readl(ohci, &ohci->regs->intrenable) &
330 OHCI_INTR_RHSC;
331
Alan Stern1f9fc882006-11-20 11:06:59 -0500332 switch (ohci->hc_control & OHCI_CTRL_HCFS) {
Alan Stern1f9fc882006-11-20 11:06:59 -0500333 case OHCI_USB_OPER:
Alan Stern4a511bc2008-09-03 16:38:32 -0400334 /* If no status changes are pending, enable RHSC interrupts. */
335 if (!rhsc_enable && !rhsc_status && !changed) {
336 rhsc_enable = OHCI_INTR_RHSC;
337 ohci_writel(ohci, rhsc_enable, &ohci->regs->intrenable);
Alan Sternb5fb4542008-08-20 17:22:05 -0400338 }
339
340 /* Keep on polling until we know a device is connected
341 * and RHSC is enabled, or until we autostop.
342 */
Alan Stern1f9fc882006-11-20 11:06:59 -0500343 if (!ohci->autostop) {
344 if (any_connected ||
345 !device_may_wakeup(&ohci_to_hcd(ohci)
346 ->self.root_hub->dev)) {
Alan Stern4a511bc2008-09-03 16:38:32 -0400347 if (rhsc_enable)
Alan Stern1f9fc882006-11-20 11:06:59 -0500348 poll_rh = 0;
349 } else {
350 ohci->autostop = 1;
351 ohci->next_statechange = jiffies + HZ;
352 }
353
354 /* if no devices have been attached for one second, autostop */
355 } else {
356 if (changed || any_connected) {
357 ohci->autostop = 0;
358 ohci->next_statechange = jiffies +
359 STATECHANGE_DELAY;
Alan Stern4a511bc2008-09-03 16:38:32 -0400360 } else if (time_after_eq(jiffies,
Alan Stern1f9fc882006-11-20 11:06:59 -0500361 ohci->next_statechange)
362 && !ohci->ed_rm_list
363 && !(ohci->hc_control &
364 OHCI_SCHED_ENABLES)) {
365 ohci_rh_suspend(ohci, 1);
Alan Stern4a511bc2008-09-03 16:38:32 -0400366 if (rhsc_enable)
367 poll_rh = 0;
Alan Stern1f9fc882006-11-20 11:06:59 -0500368 }
369 }
370 break;
371
Alan Stern1f9fc882006-11-20 11:06:59 -0500372 case OHCI_USB_SUSPEND:
373 case OHCI_USB_RESUME:
Alan Stern4a511bc2008-09-03 16:38:32 -0400374 /* if there is a port change, autostart or ask to be resumed */
Alan Stern1f9fc882006-11-20 11:06:59 -0500375 if (changed) {
376 if (ohci->autostop)
377 ohci_rh_resume(ohci);
378 else
379 usb_hcd_resume_root_hub(ohci_to_hcd(ohci));
Alan Stern71b74972008-10-09 15:40:23 -0400380
381 /* If remote wakeup is disabled, stop polling */
382 } else if (!ohci->autostop &&
383 !ohci_to_hcd(ohci)->self.root_hub->
384 do_remote_wakeup) {
385 poll_rh = 0;
386
Alan Stern1f9fc882006-11-20 11:06:59 -0500387 } else {
Alan Stern71b74972008-10-09 15:40:23 -0400388 /* If no status changes are pending,
389 * enable RHSC interrupts
390 */
391 if (!rhsc_enable && !rhsc_status) {
Alan Stern4a511bc2008-09-03 16:38:32 -0400392 rhsc_enable = OHCI_INTR_RHSC;
393 ohci_writel(ohci, rhsc_enable,
Alan Sternb5fb4542008-08-20 17:22:05 -0400394 &ohci->regs->intrenable);
Alan Stern4a511bc2008-09-03 16:38:32 -0400395 }
Alan Stern71b74972008-10-09 15:40:23 -0400396 /* Keep polling until RHSC is enabled */
Alan Stern4a511bc2008-09-03 16:38:32 -0400397 if (rhsc_enable)
398 poll_rh = 0;
Alan Stern1f9fc882006-11-20 11:06:59 -0500399 }
400 break;
401 }
402 return poll_rh;
403}
404
405#else /* CONFIG_PM */
406
407static inline int ohci_rh_resume(struct ohci_hcd *ohci)
408{
409 return 0;
410}
411
412/* Carry out polling-related state changes.
413 * autostop isn't used when CONFIG_PM is turned off.
414 */
415static int ohci_root_hub_state_changes(struct ohci_hcd *ohci, int changed,
Alan Stern71b74972008-10-09 15:40:23 -0400416 int any_connected, int rhsc_status)
Alan Stern1f9fc882006-11-20 11:06:59 -0500417{
Alan Sternb5fb4542008-08-20 17:22:05 -0400418 /* If RHSC is enabled, don't poll */
Linus Torvalds09ca8ad2008-07-06 10:27:25 -0700419 if (ohci_readl(ohci, &ohci->regs->intrenable) & OHCI_INTR_RHSC)
Alan Sternb5fb4542008-08-20 17:22:05 -0400420 return 0;
421
Alan Stern71b74972008-10-09 15:40:23 -0400422 /* If status changes are pending, continue polling.
423 * Conversely, if no status changes are pending but the RHSC
424 * status bit was set, then RHSC may be broken so continue polling.
425 */
426 if (changed || rhsc_status)
427 return 1;
428
429 /* It's safe to re-enable RHSC interrupts */
430 ohci_writel(ohci, OHCI_INTR_RHSC, &ohci->regs->intrenable);
431 return 0;
Alan Stern1f9fc882006-11-20 11:06:59 -0500432}
433
David Brownell8ad7fe12005-09-13 19:59:11 -0700434#endif /* CONFIG_PM */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435
436/*-------------------------------------------------------------------------*/
437
438/* build "status change" packet (one or two bytes) from HC registers */
439
440static int
441ohci_hub_status_data (struct usb_hcd *hcd, char *buf)
442{
443 struct ohci_hcd *ohci = hcd_to_ohci (hcd);
David Brownellfdd13b32005-08-31 11:52:57 -0700444 int i, changed = 0, length = 1;
Alan Stern052ac012006-10-27 10:33:11 -0400445 int any_connected = 0;
Alan Stern71b74972008-10-09 15:40:23 -0400446 int rhsc_status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447 unsigned long flags;
448
449 spin_lock_irqsave (&ohci->lock, flags);
Alan Stern541c7d42010-06-22 16:39:10 -0400450 if (!HCD_HW_ACCESSIBLE(hcd))
Alan Stern6fd75b12007-05-04 11:57:00 -0400451 goto done;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452
David Brownellfdd13b32005-08-31 11:52:57 -0700453 /* undocumented erratum seen on at least rev D */
454 if ((ohci->flags & OHCI_QUIRK_AMD756)
455 && (roothub_a (ohci) & RH_A_NDP) > MAX_ROOT_PORTS) {
456 ohci_warn (ohci, "bogus NDP, rereads as NDP=%d\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457 ohci_readl (ohci, &ohci->regs->roothub.a) & RH_A_NDP);
458 /* retry later; "should not happen" */
459 goto done;
460 }
461
462 /* init status */
463 if (roothub_status (ohci) & (RH_HS_LPSC | RH_HS_OCIC))
464 buf [0] = changed = 1;
465 else
466 buf [0] = 0;
David Brownellfdd13b32005-08-31 11:52:57 -0700467 if (ohci->num_ports > 7) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468 buf [1] = 0;
469 length++;
470 }
471
Alan Stern71b74972008-10-09 15:40:23 -0400472 /* Clear the RHSC status flag before reading the port statuses */
473 ohci_writel(ohci, OHCI_INTR_RHSC, &ohci->regs->intrstatus);
474 rhsc_status = ohci_readl(ohci, &ohci->regs->intrstatus) &
475 OHCI_INTR_RHSC;
476
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477 /* look at each port */
David Brownellfdd13b32005-08-31 11:52:57 -0700478 for (i = 0; i < ohci->num_ports; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479 u32 status = roothub_portstatus (ohci, i);
480
Alan Stern8d1a2432006-09-26 14:46:16 -0400481 /* can't autostop if ports are connected */
482 any_connected |= (status & RH_PS_CCS);
483
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484 if (status & (RH_PS_CSC | RH_PS_PESC | RH_PS_PSSC
485 | RH_PS_OCIC | RH_PS_PRSC)) {
486 changed = 1;
487 if (i < 7)
488 buf [0] |= 1 << (i + 1);
489 else
490 buf [1] |= 1 << (i - 7);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493
Alan Stern541c7d42010-06-22 16:39:10 -0400494 if (ohci_root_hub_state_changes(ohci, changed,
495 any_connected, rhsc_status))
496 set_bit(HCD_FLAG_POLL_RH, &hcd->flags);
497 else
498 clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
499
David Brownelld4139842006-08-04 11:31:55 -0700500
501done:
502 spin_unlock_irqrestore (&ohci->lock, flags);
503
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504 return changed ? length : 0;
505}
506
507/*-------------------------------------------------------------------------*/
508
509static void
510ohci_hub_descriptor (
511 struct ohci_hcd *ohci,
512 struct usb_hub_descriptor *desc
513) {
514 u32 rh = roothub_a (ohci);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515 u16 temp;
516
517 desc->bDescriptorType = 0x29;
518 desc->bPwrOn2PwrGood = (rh & RH_A_POTPGT) >> 24;
519 desc->bHubContrCurrent = 0;
520
David Brownellfdd13b32005-08-31 11:52:57 -0700521 desc->bNbrPorts = ohci->num_ports;
522 temp = 1 + (ohci->num_ports / 8);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523 desc->bDescLength = 7 + 2 * temp;
524
525 temp = 0;
526 if (rh & RH_A_NPS) /* no power switching? */
527 temp |= 0x0002;
David Brownelldd9048a2006-12-05 03:18:31 -0800528 if (rh & RH_A_PSM) /* per-port power switching? */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529 temp |= 0x0001;
530 if (rh & RH_A_NOCP) /* no overcurrent reporting? */
531 temp |= 0x0010;
532 else if (rh & RH_A_OCPM) /* per-port overcurrent reporting? */
533 temp |= 0x0008;
534 desc->wHubCharacteristics = (__force __u16)cpu_to_hc16(ohci, temp);
535
Sarah Sharpda130512010-11-30 15:55:51 -0800536 /* ports removable, and usb 1.0 legacy PortPwrCtrlMask */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537 rh = roothub_b (ohci);
John Youndbe79bb2001-09-17 00:00:00 -0700538 memset(desc->u.hs.DeviceRemovable, 0xff,
539 sizeof(desc->u.hs.DeviceRemovable));
540 desc->u.hs.DeviceRemovable[0] = rh & RH_B_DR;
David Brownellfdd13b32005-08-31 11:52:57 -0700541 if (ohci->num_ports > 7) {
John Youndbe79bb2001-09-17 00:00:00 -0700542 desc->u.hs.DeviceRemovable[1] = (rh & RH_B_DR) >> 8;
543 desc->u.hs.DeviceRemovable[2] = 0xff;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544 } else
John Youndbe79bb2001-09-17 00:00:00 -0700545 desc->u.hs.DeviceRemovable[1] = 0xff;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546}
547
548/*-------------------------------------------------------------------------*/
549
550#ifdef CONFIG_USB_OTG
551
552static int ohci_start_port_reset (struct usb_hcd *hcd, unsigned port)
553{
554 struct ohci_hcd *ohci = hcd_to_ohci (hcd);
555 u32 status;
556
557 if (!port)
558 return -EINVAL;
559 port--;
560
561 /* start port reset before HNP protocol times out */
562 status = ohci_readl(ohci, &ohci->regs->roothub.portstatus [port]);
563 if (!(status & RH_PS_CCS))
564 return -ENODEV;
565
566 /* khubd will finish the reset later */
567 ohci_writel(ohci, RH_PS_PRS, &ohci->regs->roothub.portstatus [port]);
568 return 0;
569}
570
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571#else
572
573#define ohci_start_port_reset NULL
574
575#endif
576
577/*-------------------------------------------------------------------------*/
578
579
580/* See usb 7.1.7.5: root hubs must issue at least 50 msec reset signaling,
581 * not necessarily continuous ... to guard against resume signaling.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583#define PORT_RESET_MSEC 50
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584
585/* this timer value might be vendor-specific ... */
586#define PORT_RESET_HW_MSEC 10
587
588/* wrap-aware logic morphed from <linux/jiffies.h> */
589#define tick_before(t1,t2) ((s16)(((s16)(t1))-((s16)(t2))) < 0)
590
591/* called from some task, normally khubd */
Takamasa Ohtake23d10a92006-12-06 17:04:15 -0800592static inline int root_port_reset (struct ohci_hcd *ohci, unsigned port)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593{
594 __hc32 __iomem *portstat = &ohci->regs->roothub.portstatus [port];
Alan Stern1b7b61c2008-04-22 10:50:18 -0400595 u32 temp = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596 u16 now = ohci_readl(ohci, &ohci->regs->fmnumber);
597 u16 reset_done = now + PORT_RESET_MSEC;
David Brownelle01e7fe2008-02-02 02:42:52 -0800598 int limit_1 = DIV_ROUND_UP(PORT_RESET_MSEC, PORT_RESET_HW_MSEC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599
600 /* build a "continuous enough" reset signal, with up to
601 * 3msec gap between pulses. scheduler HZ==100 must work;
602 * this might need to be deadline-scheduled.
603 */
604 do {
David Brownelle01e7fe2008-02-02 02:42:52 -0800605 int limit_2;
606
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607 /* spin until any current reset finishes */
David Brownelle01e7fe2008-02-02 02:42:52 -0800608 limit_2 = PORT_RESET_HW_MSEC * 2;
609 while (--limit_2 >= 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610 temp = ohci_readl (ohci, portstat);
Takamasa Ohtake23d10a92006-12-06 17:04:15 -0800611 /* handle e.g. CardBus eject */
612 if (temp == ~(u32)0)
613 return -ESHUTDOWN;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614 if (!(temp & RH_PS_PRS))
615 break;
616 udelay (500);
David Brownelldd9048a2006-12-05 03:18:31 -0800617 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618
David Brownelle01e7fe2008-02-02 02:42:52 -0800619 /* timeout (a hardware error) has been observed when
620 * EHCI sets CF while this driver is resetting a port;
621 * presumably other disconnect paths might do it too.
622 */
623 if (limit_2 < 0) {
624 ohci_dbg(ohci,
625 "port[%d] reset timeout, stat %08x\n",
626 port, temp);
627 break;
628 }
629
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630 if (!(temp & RH_PS_CCS))
631 break;
632 if (temp & RH_PS_PRSC)
633 ohci_writel (ohci, RH_PS_PRSC, portstat);
634
635 /* start the next reset, sleep till it's probably done */
636 ohci_writel (ohci, RH_PS_PRS, portstat);
637 msleep(PORT_RESET_HW_MSEC);
638 now = ohci_readl(ohci, &ohci->regs->fmnumber);
David Brownelle01e7fe2008-02-02 02:42:52 -0800639 } while (tick_before(now, reset_done) && --limit_1 >= 0);
640
641 /* caller synchronizes using PRSC ... and handles PRS
642 * still being set when this returns.
643 */
Takamasa Ohtake23d10a92006-12-06 17:04:15 -0800644
645 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646}
647
648static int ohci_hub_control (
649 struct usb_hcd *hcd,
650 u16 typeReq,
651 u16 wValue,
652 u16 wIndex,
653 char *buf,
654 u16 wLength
655) {
656 struct ohci_hcd *ohci = hcd_to_ohci (hcd);
Alan Sternfcf7d212010-04-20 10:37:57 -0400657 int ports = ohci->num_ports;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700658 u32 temp;
659 int retval = 0;
660
Alan Stern541c7d42010-06-22 16:39:10 -0400661 if (unlikely(!HCD_HW_ACCESSIBLE(hcd)))
Benjamin Herrenschmidt8de98402005-11-25 09:59:46 +1100662 return -ESHUTDOWN;
663
Linus Torvalds1da177e2005-04-16 15:20:36 -0700664 switch (typeReq) {
665 case ClearHubFeature:
666 switch (wValue) {
667 case C_HUB_OVER_CURRENT:
668 ohci_writel (ohci, RH_HS_OCIC,
669 &ohci->regs->roothub.status);
670 case C_HUB_LOCAL_POWER:
671 break;
672 default:
673 goto error;
674 }
675 break;
676 case ClearPortFeature:
677 if (!wIndex || wIndex > ports)
678 goto error;
679 wIndex--;
680
681 switch (wValue) {
682 case USB_PORT_FEAT_ENABLE:
683 temp = RH_PS_CCS;
684 break;
685 case USB_PORT_FEAT_C_ENABLE:
686 temp = RH_PS_PESC;
687 break;
688 case USB_PORT_FEAT_SUSPEND:
689 temp = RH_PS_POCI;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700690 break;
691 case USB_PORT_FEAT_C_SUSPEND:
692 temp = RH_PS_PSSC;
693 break;
694 case USB_PORT_FEAT_POWER:
695 temp = RH_PS_LSDA;
696 break;
697 case USB_PORT_FEAT_C_CONNECTION:
698 temp = RH_PS_CSC;
699 break;
700 case USB_PORT_FEAT_C_OVER_CURRENT:
701 temp = RH_PS_OCIC;
702 break;
703 case USB_PORT_FEAT_C_RESET:
704 temp = RH_PS_PRSC;
705 break;
706 default:
707 goto error;
708 }
709 ohci_writel (ohci, temp,
710 &ohci->regs->roothub.portstatus [wIndex]);
711 // ohci_readl (ohci, &ohci->regs->roothub.portstatus [wIndex]);
712 break;
713 case GetHubDescriptor:
714 ohci_hub_descriptor (ohci, (struct usb_hub_descriptor *) buf);
715 break;
716 case GetHubStatus:
717 temp = roothub_status (ohci) & ~(RH_HS_CRWE | RH_HS_DRWE);
Harvey Harrisona5abdea2008-04-29 01:03:40 -0700718 put_unaligned_le32(temp, buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700719 break;
720 case GetPortStatus:
721 if (!wIndex || wIndex > ports)
722 goto error;
723 wIndex--;
724 temp = roothub_portstatus (ohci, wIndex);
Harvey Harrisona5abdea2008-04-29 01:03:40 -0700725 put_unaligned_le32(temp, buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700726
727#ifndef OHCI_VERBOSE_DEBUG
728 if (*(u16*)(buf+2)) /* only if wPortChange is interesting */
729#endif
730 dbg_port (ohci, "GetStatus", wIndex, temp);
731 break;
732 case SetHubFeature:
733 switch (wValue) {
734 case C_HUB_OVER_CURRENT:
735 // FIXME: this can be cleared, yes?
736 case C_HUB_LOCAL_POWER:
737 break;
738 default:
739 goto error;
740 }
741 break;
742 case SetPortFeature:
743 if (!wIndex || wIndex > ports)
744 goto error;
745 wIndex--;
746 switch (wValue) {
747 case USB_PORT_FEAT_SUSPEND:
748#ifdef CONFIG_USB_OTG
749 if (hcd->self.otg_port == (wIndex + 1)
750 && hcd->self.b_hnp_enable)
Dmitry Baryshkove8b24452008-07-06 14:26:30 +0400751 ohci->start_hnp(ohci);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752 else
753#endif
754 ohci_writel (ohci, RH_PS_PSS,
755 &ohci->regs->roothub.portstatus [wIndex]);
756 break;
757 case USB_PORT_FEAT_POWER:
758 ohci_writel (ohci, RH_PS_PPS,
759 &ohci->regs->roothub.portstatus [wIndex]);
760 break;
761 case USB_PORT_FEAT_RESET:
Takamasa Ohtake23d10a92006-12-06 17:04:15 -0800762 retval = root_port_reset (ohci, wIndex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763 break;
764 default:
765 goto error;
766 }
767 break;
768
769 default:
770error:
771 /* "protocol stall" on error */
772 retval = -EPIPE;
773 }
774 return retval;
775}
776