cxgb3: Fix lockdep problems with sge.reg_lock
[linux-2.6] / drivers / usb / host / uhci-hub.c
1 /*
2  * Universal Host Controller Interface driver for USB.
3  *
4  * Maintainer: Alan Stern <stern@rowland.harvard.edu>
5  *
6  * (C) Copyright 1999 Linus Torvalds
7  * (C) Copyright 1999-2002 Johannes Erdfelt, johannes@erdfelt.com
8  * (C) Copyright 1999 Randy Dunlap
9  * (C) Copyright 1999 Georg Acher, acher@in.tum.de
10  * (C) Copyright 1999 Deti Fliegl, deti@fliegl.de
11  * (C) Copyright 1999 Thomas Sailer, sailer@ife.ee.ethz.ch
12  * (C) Copyright 2004 Alan Stern, stern@rowland.harvard.edu
13  */
14
15 static __u8 root_hub_hub_des[] =
16 {
17         0x09,                   /*  __u8  bLength; */
18         0x29,                   /*  __u8  bDescriptorType; Hub-descriptor */
19         0x02,                   /*  __u8  bNbrPorts; */
20         0x0a,                   /* __u16  wHubCharacteristics; */
21         0x00,                   /*   (per-port OC, no power switching) */
22         0x01,                   /*  __u8  bPwrOn2pwrGood; 2ms */
23         0x00,                   /*  __u8  bHubContrCurrent; 0 mA */
24         0x00,                   /*  __u8  DeviceRemovable; *** 7 Ports max *** */
25         0xff                    /*  __u8  PortPwrCtrlMask; *** 7 ports max *** */
26 };
27
28 #define UHCI_RH_MAXCHILD        7
29
30 /* must write as zeroes */
31 #define WZ_BITS         (USBPORTSC_RES2 | USBPORTSC_RES3 | USBPORTSC_RES4)
32
33 /* status change bits:  nonzero writes will clear */
34 #define RWC_BITS        (USBPORTSC_OCC | USBPORTSC_PEC | USBPORTSC_CSC)
35
36 /* suspend/resume bits: port suspended or port resuming */
37 #define SUSPEND_BITS    (USBPORTSC_SUSP | USBPORTSC_RD)
38
39 /* A port that either is connected or has a changed-bit set will prevent
40  * us from AUTO_STOPPING.
41  */
42 static int any_ports_active(struct uhci_hcd *uhci)
43 {
44         int port;
45
46         for (port = 0; port < uhci->rh_numports; ++port) {
47                 if ((inw(uhci->io_addr + USBPORTSC1 + port * 2) &
48                                 (USBPORTSC_CCS | RWC_BITS)) ||
49                                 test_bit(port, &uhci->port_c_suspend))
50                         return 1;
51         }
52         return 0;
53 }
54
55 static inline int get_hub_status_data(struct uhci_hcd *uhci, char *buf)
56 {
57         int port;
58         int mask = RWC_BITS;
59
60         /* Some boards (both VIA and Intel apparently) report bogus
61          * overcurrent indications, causing massive log spam unless
62          * we completely ignore them.  This doesn't seem to be a problem
63          * with the chipset so much as with the way it is connected on
64          * the motherboard; if the overcurrent input is left to float
65          * then it may constantly register false positives. */
66         if (ignore_oc)
67                 mask &= ~USBPORTSC_OCC;
68
69         *buf = 0;
70         for (port = 0; port < uhci->rh_numports; ++port) {
71                 if ((inw(uhci->io_addr + USBPORTSC1 + port * 2) & mask) ||
72                                 test_bit(port, &uhci->port_c_suspend))
73                         *buf |= (1 << (port + 1));
74         }
75         return !!*buf;
76 }
77
78 #define OK(x)                   len = (x); break
79
80 #define CLR_RH_PORTSTAT(x) \
81         status = inw(port_addr); \
82         status &= ~(RWC_BITS|WZ_BITS); \
83         status &= ~(x); \
84         status |= RWC_BITS & (x); \
85         outw(status, port_addr)
86
87 #define SET_RH_PORTSTAT(x) \
88         status = inw(port_addr); \
89         status |= (x); \
90         status &= ~(RWC_BITS|WZ_BITS); \
91         outw(status, port_addr)
92
93 /* UHCI controllers don't automatically stop resume signalling after 20 msec,
94  * so we have to poll and check timeouts in order to take care of it.
95  */
96 static void uhci_finish_suspend(struct uhci_hcd *uhci, int port,
97                 unsigned long port_addr)
98 {
99         int status;
100         int i;
101
102         if (inw(port_addr) & SUSPEND_BITS) {
103                 CLR_RH_PORTSTAT(SUSPEND_BITS);
104                 if (test_bit(port, &uhci->resuming_ports))
105                         set_bit(port, &uhci->port_c_suspend);
106
107                 /* The controller won't actually turn off the RD bit until
108                  * it has had a chance to send a low-speed EOP sequence,
109                  * which is supposed to take 3 bit times (= 2 microseconds).
110                  * Experiments show that some controllers take longer, so
111                  * we'll poll for completion. */
112                 for (i = 0; i < 10; ++i) {
113                         if (!(inw(port_addr) & SUSPEND_BITS))
114                                 break;
115                         udelay(1);
116                 }
117         }
118         clear_bit(port, &uhci->resuming_ports);
119 }
120
121 /* Wait for the UHCI controller in HP's iLO2 server management chip.
122  * It can take up to 250 us to finish a reset and set the CSC bit.
123  */
124 static void wait_for_HP(unsigned long port_addr)
125 {
126         int i;
127
128         for (i = 10; i < 250; i += 10) {
129                 if (inw(port_addr) & USBPORTSC_CSC)
130                         return;
131                 udelay(10);
132         }
133         /* Log a warning? */
134 }
135
136 static void uhci_check_ports(struct uhci_hcd *uhci)
137 {
138         unsigned int port;
139         unsigned long port_addr;
140         int status;
141
142         for (port = 0; port < uhci->rh_numports; ++port) {
143                 port_addr = uhci->io_addr + USBPORTSC1 + 2 * port;
144                 status = inw(port_addr);
145                 if (unlikely(status & USBPORTSC_PR)) {
146                         if (time_after_eq(jiffies, uhci->ports_timeout)) {
147                                 CLR_RH_PORTSTAT(USBPORTSC_PR);
148                                 udelay(10);
149
150                                 /* HP's server management chip requires
151                                  * a longer delay. */
152                                 if (to_pci_dev(uhci_dev(uhci))->vendor ==
153                                                 PCI_VENDOR_ID_HP)
154                                         wait_for_HP(port_addr);
155
156                                 /* If the port was enabled before, turning
157                                  * reset on caused a port enable change.
158                                  * Turning reset off causes a port connect
159                                  * status change.  Clear these changes. */
160                                 CLR_RH_PORTSTAT(USBPORTSC_CSC | USBPORTSC_PEC);
161                                 SET_RH_PORTSTAT(USBPORTSC_PE);
162                         }
163                 }
164                 if (unlikely(status & USBPORTSC_RD)) {
165                         if (!test_bit(port, &uhci->resuming_ports)) {
166
167                                 /* Port received a wakeup request */
168                                 set_bit(port, &uhci->resuming_ports);
169                                 uhci->ports_timeout = jiffies +
170                                                 msecs_to_jiffies(20);
171
172                                 /* Make sure we see the port again
173                                  * after the resuming period is over. */
174                                 mod_timer(&uhci_to_hcd(uhci)->rh_timer,
175                                                 uhci->ports_timeout);
176                         } else if (time_after_eq(jiffies,
177                                                 uhci->ports_timeout)) {
178                                 uhci_finish_suspend(uhci, port, port_addr);
179                         }
180                 }
181         }
182 }
183
184 static int uhci_hub_status_data(struct usb_hcd *hcd, char *buf)
185 {
186         struct uhci_hcd *uhci = hcd_to_uhci(hcd);
187         unsigned long flags;
188         int status = 0;
189
190         spin_lock_irqsave(&uhci->lock, flags);
191
192         uhci_scan_schedule(uhci);
193         if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags) || uhci->dead)
194                 goto done;
195         uhci_check_ports(uhci);
196
197         status = get_hub_status_data(uhci, buf);
198
199         switch (uhci->rh_state) {
200             case UHCI_RH_SUSPENDING:
201             case UHCI_RH_SUSPENDED:
202                 /* if port change, ask to be resumed */
203                 if (status)
204                         usb_hcd_resume_root_hub(hcd);
205                 break;
206
207             case UHCI_RH_AUTO_STOPPED:
208                 /* if port change, auto start */
209                 if (status)
210                         wakeup_rh(uhci);
211                 break;
212
213             case UHCI_RH_RUNNING:
214                 /* are any devices attached? */
215                 if (!any_ports_active(uhci)) {
216                         uhci->rh_state = UHCI_RH_RUNNING_NODEVS;
217                         uhci->auto_stop_time = jiffies + HZ;
218                 }
219                 break;
220
221             case UHCI_RH_RUNNING_NODEVS:
222                 /* auto-stop if nothing connected for 1 second */
223                 if (any_ports_active(uhci))
224                         uhci->rh_state = UHCI_RH_RUNNING;
225                 else if (time_after_eq(jiffies, uhci->auto_stop_time))
226                         suspend_rh(uhci, UHCI_RH_AUTO_STOPPED);
227                 break;
228
229             default:
230                 break;
231         }
232
233 done:
234         spin_unlock_irqrestore(&uhci->lock, flags);
235         return status;
236 }
237
238 /* size of returned buffer is part of USB spec */
239 static int uhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
240                         u16 wIndex, char *buf, u16 wLength)
241 {
242         struct uhci_hcd *uhci = hcd_to_uhci(hcd);
243         int status, lstatus, retval = 0, len = 0;
244         unsigned int port = wIndex - 1;
245         unsigned long port_addr = uhci->io_addr + USBPORTSC1 + 2 * port;
246         u16 wPortChange, wPortStatus;
247         unsigned long flags;
248
249         if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags) || uhci->dead)
250                 return -ETIMEDOUT;
251
252         spin_lock_irqsave(&uhci->lock, flags);
253         switch (typeReq) {
254
255         case GetHubStatus:
256                 *(__le32 *)buf = cpu_to_le32(0);
257                 OK(4);          /* hub power */
258         case GetPortStatus:
259                 if (port >= uhci->rh_numports)
260                         goto err;
261
262                 uhci_check_ports(uhci);
263                 status = inw(port_addr);
264
265                 /* Intel controllers report the OverCurrent bit active on.
266                  * VIA controllers report it active off, so we'll adjust the
267                  * bit value.  (It's not standardized in the UHCI spec.)
268                  */
269                 if (to_pci_dev(hcd->self.controller)->vendor ==
270                                 PCI_VENDOR_ID_VIA)
271                         status ^= USBPORTSC_OC;
272
273                 /* UHCI doesn't support C_RESET (always false) */
274                 wPortChange = lstatus = 0;
275                 if (status & USBPORTSC_CSC)
276                         wPortChange |= USB_PORT_STAT_C_CONNECTION;
277                 if (status & USBPORTSC_PEC)
278                         wPortChange |= USB_PORT_STAT_C_ENABLE;
279                 if ((status & USBPORTSC_OCC) && !ignore_oc)
280                         wPortChange |= USB_PORT_STAT_C_OVERCURRENT;
281
282                 if (test_bit(port, &uhci->port_c_suspend)) {
283                         wPortChange |= USB_PORT_STAT_C_SUSPEND;
284                         lstatus |= 1;
285                 }
286                 if (test_bit(port, &uhci->resuming_ports))
287                         lstatus |= 4;
288
289                 /* UHCI has no power switching (always on) */
290                 wPortStatus = USB_PORT_STAT_POWER;
291                 if (status & USBPORTSC_CCS)
292                         wPortStatus |= USB_PORT_STAT_CONNECTION;
293                 if (status & USBPORTSC_PE) {
294                         wPortStatus |= USB_PORT_STAT_ENABLE;
295                         if (status & SUSPEND_BITS)
296                                 wPortStatus |= USB_PORT_STAT_SUSPEND;
297                 }
298                 if (status & USBPORTSC_OC)
299                         wPortStatus |= USB_PORT_STAT_OVERCURRENT;
300                 if (status & USBPORTSC_PR)
301                         wPortStatus |= USB_PORT_STAT_RESET;
302                 if (status & USBPORTSC_LSDA)
303                         wPortStatus |= USB_PORT_STAT_LOW_SPEED;
304
305                 if (wPortChange)
306                         dev_dbg(uhci_dev(uhci), "port %d portsc %04x,%02x\n",
307                                         wIndex, status, lstatus);
308
309                 *(__le16 *)buf = cpu_to_le16(wPortStatus);
310                 *(__le16 *)(buf + 2) = cpu_to_le16(wPortChange);
311                 OK(4);
312         case SetHubFeature:             /* We don't implement these */
313         case ClearHubFeature:
314                 switch (wValue) {
315                 case C_HUB_OVER_CURRENT:
316                 case C_HUB_LOCAL_POWER:
317                         OK(0);
318                 default:
319                         goto err;
320                 }
321                 break;
322         case SetPortFeature:
323                 if (port >= uhci->rh_numports)
324                         goto err;
325
326                 switch (wValue) {
327                 case USB_PORT_FEAT_SUSPEND:
328                         SET_RH_PORTSTAT(USBPORTSC_SUSP);
329                         OK(0);
330                 case USB_PORT_FEAT_RESET:
331                         SET_RH_PORTSTAT(USBPORTSC_PR);
332
333                         /* Reset terminates Resume signalling */
334                         uhci_finish_suspend(uhci, port, port_addr);
335
336                         /* USB v2.0 7.1.7.5 */
337                         uhci->ports_timeout = jiffies + msecs_to_jiffies(50);
338                         OK(0);
339                 case USB_PORT_FEAT_POWER:
340                         /* UHCI has no power switching */
341                         OK(0);
342                 default:
343                         goto err;
344                 }
345                 break;
346         case ClearPortFeature:
347                 if (port >= uhci->rh_numports)
348                         goto err;
349
350                 switch (wValue) {
351                 case USB_PORT_FEAT_ENABLE:
352                         CLR_RH_PORTSTAT(USBPORTSC_PE);
353
354                         /* Disable terminates Resume signalling */
355                         uhci_finish_suspend(uhci, port, port_addr);
356                         OK(0);
357                 case USB_PORT_FEAT_C_ENABLE:
358                         CLR_RH_PORTSTAT(USBPORTSC_PEC);
359                         OK(0);
360                 case USB_PORT_FEAT_SUSPEND:
361                         if (!(inw(port_addr) & USBPORTSC_SUSP)) {
362
363                                 /* Make certain the port isn't suspended */
364                                 uhci_finish_suspend(uhci, port, port_addr);
365                         } else if (!test_and_set_bit(port,
366                                                 &uhci->resuming_ports)) {
367                                 SET_RH_PORTSTAT(USBPORTSC_RD);
368
369                                 /* The controller won't allow RD to be set
370                                  * if the port is disabled.  When this happens
371                                  * just skip the Resume signalling.
372                                  */
373                                 if (!(inw(port_addr) & USBPORTSC_RD))
374                                         uhci_finish_suspend(uhci, port,
375                                                         port_addr);
376                                 else
377                                         /* USB v2.0 7.1.7.7 */
378                                         uhci->ports_timeout = jiffies +
379                                                 msecs_to_jiffies(20);
380                         }
381                         OK(0);
382                 case USB_PORT_FEAT_C_SUSPEND:
383                         clear_bit(port, &uhci->port_c_suspend);
384                         OK(0);
385                 case USB_PORT_FEAT_POWER:
386                         /* UHCI has no power switching */
387                         goto err;
388                 case USB_PORT_FEAT_C_CONNECTION:
389                         CLR_RH_PORTSTAT(USBPORTSC_CSC);
390                         OK(0);
391                 case USB_PORT_FEAT_C_OVER_CURRENT:
392                         CLR_RH_PORTSTAT(USBPORTSC_OCC);
393                         OK(0);
394                 case USB_PORT_FEAT_C_RESET:
395                         /* this driver won't report these */
396                         OK(0);
397                 default:
398                         goto err;
399                 }
400                 break;
401         case GetHubDescriptor:
402                 len = min_t(unsigned int, sizeof(root_hub_hub_des), wLength);
403                 memcpy(buf, root_hub_hub_des, len);
404                 if (len > 2)
405                         buf[2] = uhci->rh_numports;
406                 OK(len);
407         default:
408 err:
409                 retval = -EPIPE;
410         }
411         spin_unlock_irqrestore(&uhci->lock, flags);
412
413         return retval;
414 }