Merge git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc
[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 /* A port that either is connected or has a changed-bit set will prevent
37  * us from AUTO_STOPPING.
38  */
39 static int any_ports_active(struct uhci_hcd *uhci)
40 {
41         int port;
42
43         for (port = 0; port < uhci->rh_numports; ++port) {
44                 if ((inw(uhci->io_addr + USBPORTSC1 + port * 2) &
45                                 (USBPORTSC_CCS | RWC_BITS)) ||
46                                 test_bit(port, &uhci->port_c_suspend))
47                         return 1;
48         }
49         return 0;
50 }
51
52 static inline int get_hub_status_data(struct uhci_hcd *uhci, char *buf)
53 {
54         int port;
55
56         *buf = 0;
57         for (port = 0; port < uhci->rh_numports; ++port) {
58                 if ((inw(uhci->io_addr + USBPORTSC1 + port * 2) & RWC_BITS) ||
59                                 test_bit(port, &uhci->port_c_suspend))
60                         *buf |= (1 << (port + 1));
61         }
62         return !!*buf;
63 }
64
65 #define OK(x)                   len = (x); break
66
67 #define CLR_RH_PORTSTAT(x) \
68         status = inw(port_addr); \
69         status &= ~(RWC_BITS|WZ_BITS); \
70         status &= ~(x); \
71         status |= RWC_BITS & (x); \
72         outw(status, port_addr)
73
74 #define SET_RH_PORTSTAT(x) \
75         status = inw(port_addr); \
76         status |= (x); \
77         status &= ~(RWC_BITS|WZ_BITS); \
78         outw(status, port_addr)
79
80 /* UHCI controllers don't automatically stop resume signalling after 20 msec,
81  * so we have to poll and check timeouts in order to take care of it.
82  */
83 static void uhci_finish_suspend(struct uhci_hcd *uhci, int port,
84                 unsigned long port_addr)
85 {
86         int status;
87
88         if (inw(port_addr) & (USBPORTSC_SUSP | USBPORTSC_RD)) {
89                 CLR_RH_PORTSTAT(USBPORTSC_SUSP | USBPORTSC_RD);
90                 if (test_bit(port, &uhci->resuming_ports))
91                         set_bit(port, &uhci->port_c_suspend);
92
93                 /* The controller won't actually turn off the RD bit until
94                  * it has had a chance to send a low-speed EOP sequence,
95                  * which takes 3 bit times (= 2 microseconds).  We'll delay
96                  * slightly longer for good luck. */
97                 udelay(4);
98         }
99         clear_bit(port, &uhci->resuming_ports);
100 }
101
102 /* Wait for the UHCI controller in HP's iLO2 server management chip.
103  * It can take up to 250 us to finish a reset and set the CSC bit.
104  */
105 static void wait_for_HP(unsigned long port_addr)
106 {
107         int i;
108
109         for (i = 10; i < 250; i += 10) {
110                 if (inw(port_addr) & USBPORTSC_CSC)
111                         return;
112                 udelay(10);
113         }
114         /* Log a warning? */
115 }
116
117 static void uhci_check_ports(struct uhci_hcd *uhci)
118 {
119         unsigned int port;
120         unsigned long port_addr;
121         int status;
122
123         for (port = 0; port < uhci->rh_numports; ++port) {
124                 port_addr = uhci->io_addr + USBPORTSC1 + 2 * port;
125                 status = inw(port_addr);
126                 if (unlikely(status & USBPORTSC_PR)) {
127                         if (time_after_eq(jiffies, uhci->ports_timeout)) {
128                                 CLR_RH_PORTSTAT(USBPORTSC_PR);
129                                 udelay(10);
130
131                                 /* HP's server management chip requires
132                                  * a longer delay. */
133                                 if (to_pci_dev(uhci_dev(uhci))->vendor ==
134                                                 PCI_VENDOR_ID_HP)
135                                         wait_for_HP(port_addr);
136
137                                 /* If the port was enabled before, turning
138                                  * reset on caused a port enable change.
139                                  * Turning reset off causes a port connect
140                                  * status change.  Clear these changes. */
141                                 CLR_RH_PORTSTAT(USBPORTSC_CSC | USBPORTSC_PEC);
142                                 SET_RH_PORTSTAT(USBPORTSC_PE);
143                         }
144                 }
145                 if (unlikely(status & USBPORTSC_RD)) {
146                         if (!test_bit(port, &uhci->resuming_ports)) {
147
148                                 /* Port received a wakeup request */
149                                 set_bit(port, &uhci->resuming_ports);
150                                 uhci->ports_timeout = jiffies +
151                                                 msecs_to_jiffies(20);
152
153                                 /* Make sure we see the port again
154                                  * after the resuming period is over. */
155                                 mod_timer(&uhci_to_hcd(uhci)->rh_timer,
156                                                 uhci->ports_timeout);
157                         } else if (time_after_eq(jiffies,
158                                                 uhci->ports_timeout)) {
159                                 uhci_finish_suspend(uhci, port, port_addr);
160                         }
161                 }
162         }
163 }
164
165 static int uhci_hub_status_data(struct usb_hcd *hcd, char *buf)
166 {
167         struct uhci_hcd *uhci = hcd_to_uhci(hcd);
168         unsigned long flags;
169         int status = 0;
170
171         spin_lock_irqsave(&uhci->lock, flags);
172
173         uhci_scan_schedule(uhci, NULL);
174         if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags) || uhci->dead)
175                 goto done;
176         uhci_check_ports(uhci);
177
178         status = get_hub_status_data(uhci, buf);
179
180         switch (uhci->rh_state) {
181             case UHCI_RH_SUSPENDING:
182             case UHCI_RH_SUSPENDED:
183                 /* if port change, ask to be resumed */
184                 if (status)
185                         usb_hcd_resume_root_hub(hcd);
186                 break;
187
188             case UHCI_RH_AUTO_STOPPED:
189                 /* if port change, auto start */
190                 if (status)
191                         wakeup_rh(uhci);
192                 break;
193
194             case UHCI_RH_RUNNING:
195                 /* are any devices attached? */
196                 if (!any_ports_active(uhci)) {
197                         uhci->rh_state = UHCI_RH_RUNNING_NODEVS;
198                         uhci->auto_stop_time = jiffies + HZ;
199                 }
200                 break;
201
202             case UHCI_RH_RUNNING_NODEVS:
203                 /* auto-stop if nothing connected for 1 second */
204                 if (any_ports_active(uhci))
205                         uhci->rh_state = UHCI_RH_RUNNING;
206                 else if (time_after_eq(jiffies, uhci->auto_stop_time))
207                         suspend_rh(uhci, UHCI_RH_AUTO_STOPPED);
208                 break;
209
210             default:
211                 break;
212         }
213
214 done:
215         spin_unlock_irqrestore(&uhci->lock, flags);
216         return status;
217 }
218
219 /* size of returned buffer is part of USB spec */
220 static int uhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
221                         u16 wIndex, char *buf, u16 wLength)
222 {
223         struct uhci_hcd *uhci = hcd_to_uhci(hcd);
224         int status, lstatus, retval = 0, len = 0;
225         unsigned int port = wIndex - 1;
226         unsigned long port_addr = uhci->io_addr + USBPORTSC1 + 2 * port;
227         u16 wPortChange, wPortStatus;
228         unsigned long flags;
229
230         if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags) || uhci->dead)
231                 return -ETIMEDOUT;
232
233         spin_lock_irqsave(&uhci->lock, flags);
234         switch (typeReq) {
235
236         case GetHubStatus:
237                 *(__le32 *)buf = cpu_to_le32(0);
238                 OK(4);          /* hub power */
239         case GetPortStatus:
240                 if (port >= uhci->rh_numports)
241                         goto err;
242
243                 uhci_check_ports(uhci);
244                 status = inw(port_addr);
245
246                 /* Intel controllers report the OverCurrent bit active on.
247                  * VIA controllers report it active off, so we'll adjust the
248                  * bit value.  (It's not standardized in the UHCI spec.)
249                  */
250                 if (to_pci_dev(hcd->self.controller)->vendor ==
251                                 PCI_VENDOR_ID_VIA)
252                         status ^= USBPORTSC_OC;
253
254                 /* UHCI doesn't support C_RESET (always false) */
255                 wPortChange = lstatus = 0;
256                 if (status & USBPORTSC_CSC)
257                         wPortChange |= USB_PORT_STAT_C_CONNECTION;
258                 if (status & USBPORTSC_PEC)
259                         wPortChange |= USB_PORT_STAT_C_ENABLE;
260                 if (status & USBPORTSC_OCC)
261                         wPortChange |= USB_PORT_STAT_C_OVERCURRENT;
262
263                 if (test_bit(port, &uhci->port_c_suspend)) {
264                         wPortChange |= USB_PORT_STAT_C_SUSPEND;
265                         lstatus |= 1;
266                 }
267                 if (test_bit(port, &uhci->resuming_ports))
268                         lstatus |= 4;
269
270                 /* UHCI has no power switching (always on) */
271                 wPortStatus = USB_PORT_STAT_POWER;
272                 if (status & USBPORTSC_CCS)
273                         wPortStatus |= USB_PORT_STAT_CONNECTION;
274                 if (status & USBPORTSC_PE) {
275                         wPortStatus |= USB_PORT_STAT_ENABLE;
276                         if (status & (USBPORTSC_SUSP | USBPORTSC_RD))
277                                 wPortStatus |= USB_PORT_STAT_SUSPEND;
278                 }
279                 if (status & USBPORTSC_OC)
280                         wPortStatus |= USB_PORT_STAT_OVERCURRENT;
281                 if (status & USBPORTSC_PR)
282                         wPortStatus |= USB_PORT_STAT_RESET;
283                 if (status & USBPORTSC_LSDA)
284                         wPortStatus |= USB_PORT_STAT_LOW_SPEED;
285
286                 if (wPortChange)
287                         dev_dbg(uhci_dev(uhci), "port %d portsc %04x,%02x\n",
288                                         wIndex, status, lstatus);
289
290                 *(__le16 *)buf = cpu_to_le16(wPortStatus);
291                 *(__le16 *)(buf + 2) = cpu_to_le16(wPortChange);
292                 OK(4);
293         case SetHubFeature:             /* We don't implement these */
294         case ClearHubFeature:
295                 switch (wValue) {
296                 case C_HUB_OVER_CURRENT:
297                 case C_HUB_LOCAL_POWER:
298                         OK(0);
299                 default:
300                         goto err;
301                 }
302                 break;
303         case SetPortFeature:
304                 if (port >= uhci->rh_numports)
305                         goto err;
306
307                 switch (wValue) {
308                 case USB_PORT_FEAT_SUSPEND:
309                         SET_RH_PORTSTAT(USBPORTSC_SUSP);
310                         OK(0);
311                 case USB_PORT_FEAT_RESET:
312                         SET_RH_PORTSTAT(USBPORTSC_PR);
313
314                         /* Reset terminates Resume signalling */
315                         uhci_finish_suspend(uhci, port, port_addr);
316
317                         /* USB v2.0 7.1.7.5 */
318                         uhci->ports_timeout = jiffies + msecs_to_jiffies(50);
319                         OK(0);
320                 case USB_PORT_FEAT_POWER:
321                         /* UHCI has no power switching */
322                         OK(0);
323                 default:
324                         goto err;
325                 }
326                 break;
327         case ClearPortFeature:
328                 if (port >= uhci->rh_numports)
329                         goto err;
330
331                 switch (wValue) {
332                 case USB_PORT_FEAT_ENABLE:
333                         CLR_RH_PORTSTAT(USBPORTSC_PE);
334
335                         /* Disable terminates Resume signalling */
336                         uhci_finish_suspend(uhci, port, port_addr);
337                         OK(0);
338                 case USB_PORT_FEAT_C_ENABLE:
339                         CLR_RH_PORTSTAT(USBPORTSC_PEC);
340                         OK(0);
341                 case USB_PORT_FEAT_SUSPEND:
342                         if (!(inw(port_addr) & USBPORTSC_SUSP)) {
343
344                                 /* Make certain the port isn't suspended */
345                                 uhci_finish_suspend(uhci, port, port_addr);
346                         } else if (!test_and_set_bit(port,
347                                                 &uhci->resuming_ports)) {
348                                 SET_RH_PORTSTAT(USBPORTSC_RD);
349
350                                 /* The controller won't allow RD to be set
351                                  * if the port is disabled.  When this happens
352                                  * just skip the Resume signalling.
353                                  */
354                                 if (!(inw(port_addr) & USBPORTSC_RD))
355                                         uhci_finish_suspend(uhci, port,
356                                                         port_addr);
357                                 else
358                                         /* USB v2.0 7.1.7.7 */
359                                         uhci->ports_timeout = jiffies +
360                                                 msecs_to_jiffies(20);
361                         }
362                         OK(0);
363                 case USB_PORT_FEAT_C_SUSPEND:
364                         clear_bit(port, &uhci->port_c_suspend);
365                         OK(0);
366                 case USB_PORT_FEAT_POWER:
367                         /* UHCI has no power switching */
368                         goto err;
369                 case USB_PORT_FEAT_C_CONNECTION:
370                         CLR_RH_PORTSTAT(USBPORTSC_CSC);
371                         OK(0);
372                 case USB_PORT_FEAT_C_OVER_CURRENT:
373                         CLR_RH_PORTSTAT(USBPORTSC_OCC);
374                         OK(0);
375                 case USB_PORT_FEAT_C_RESET:
376                         /* this driver won't report these */
377                         OK(0);
378                 default:
379                         goto err;
380                 }
381                 break;
382         case GetHubDescriptor:
383                 len = min_t(unsigned int, sizeof(root_hub_hub_des), wLength);
384                 memcpy(buf, root_hub_hub_des, len);
385                 if (len > 2)
386                         buf[2] = uhci->rh_numports;
387                 OK(len);
388         default:
389 err:
390                 retval = -EPIPE;
391         }
392         spin_unlock_irqrestore(&uhci->lock, flags);
393
394         return retval;
395 }