Pull bugzilla-7200 into release branch
[linux-2.6] / drivers / usb / host / uhci-hcd.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 1999 Roman Weissgaerber, weissg@vienna.at
13  * (C) Copyright 2000 Yggdrasil Computing, Inc. (port of new PCI interface
14  *               support from usb-ohci.c by Adam Richter, adam@yggdrasil.com).
15  * (C) Copyright 1999 Gregory P. Smith (from usb-ohci.c)
16  * (C) Copyright 2004-2006 Alan Stern, stern@rowland.harvard.edu
17  *
18  * Intel documents this fairly well, and as far as I know there
19  * are no royalties or anything like that, but even so there are
20  * people who decided that they want to do the same thing in a
21  * completely different way.
22  *
23  */
24
25 #include <linux/module.h>
26 #include <linux/pci.h>
27 #include <linux/kernel.h>
28 #include <linux/init.h>
29 #include <linux/delay.h>
30 #include <linux/ioport.h>
31 #include <linux/slab.h>
32 #include <linux/errno.h>
33 #include <linux/unistd.h>
34 #include <linux/interrupt.h>
35 #include <linux/spinlock.h>
36 #include <linux/debugfs.h>
37 #include <linux/pm.h>
38 #include <linux/dmapool.h>
39 #include <linux/dma-mapping.h>
40 #include <linux/usb.h>
41 #include <linux/bitops.h>
42 #include <linux/dmi.h>
43
44 #include <asm/uaccess.h>
45 #include <asm/io.h>
46 #include <asm/irq.h>
47 #include <asm/system.h>
48
49 #include "../core/hcd.h"
50 #include "uhci-hcd.h"
51 #include "pci-quirks.h"
52
53 /*
54  * Version Information
55  */
56 #define DRIVER_VERSION "v3.0"
57 #define DRIVER_AUTHOR "Linus 'Frodo Rabbit' Torvalds, Johannes Erdfelt, \
58 Randy Dunlap, Georg Acher, Deti Fliegl, Thomas Sailer, Roman Weissgaerber, \
59 Alan Stern"
60 #define DRIVER_DESC "USB Universal Host Controller Interface driver"
61
62 /* for flakey hardware, ignore overcurrent indicators */
63 static int ignore_oc;
64 module_param(ignore_oc, bool, S_IRUGO);
65 MODULE_PARM_DESC(ignore_oc, "ignore hardware overcurrent indications");
66
67 /*
68  * debug = 0, no debugging messages
69  * debug = 1, dump failed URBs except for stalls
70  * debug = 2, dump all failed URBs (including stalls)
71  *            show all queues in /debug/uhci/[pci_addr]
72  * debug = 3, show all TDs in URBs when dumping
73  */
74 #ifdef DEBUG
75 #define DEBUG_CONFIGURED        1
76 static int debug = 1;
77 module_param(debug, int, S_IRUGO | S_IWUSR);
78 MODULE_PARM_DESC(debug, "Debug level");
79
80 #else
81 #define DEBUG_CONFIGURED        0
82 #define debug                   0
83 #endif
84
85 static char *errbuf;
86 #define ERRBUF_LEN    (32 * 1024)
87
88 static struct kmem_cache *uhci_up_cachep;       /* urb_priv */
89
90 static void suspend_rh(struct uhci_hcd *uhci, enum uhci_rh_state new_state);
91 static void wakeup_rh(struct uhci_hcd *uhci);
92 static void uhci_get_current_frame_number(struct uhci_hcd *uhci);
93
94 /*
95  * Calculate the link pointer DMA value for the first Skeleton QH in a frame.
96  */
97 static __le32 uhci_frame_skel_link(struct uhci_hcd *uhci, int frame)
98 {
99         int skelnum;
100
101         /*
102          * The interrupt queues will be interleaved as evenly as possible.
103          * There's not much to be done about period-1 interrupts; they have
104          * to occur in every frame.  But we can schedule period-2 interrupts
105          * in odd-numbered frames, period-4 interrupts in frames congruent
106          * to 2 (mod 4), and so on.  This way each frame only has two
107          * interrupt QHs, which will help spread out bandwidth utilization.
108          *
109          * ffs (Find First bit Set) does exactly what we need:
110          * 1,3,5,...  => ffs = 0 => use skel_int2_qh = skelqh[8],
111          * 2,6,10,... => ffs = 1 => use skel_int4_qh = skelqh[7], etc.
112          * ffs >= 7 => not on any high-period queue, so use
113          *      skel_int1_qh = skelqh[9].
114          * Add in UHCI_NUMFRAMES to insure at least one bit is set.
115          */
116         skelnum = 8 - (int) __ffs(frame | UHCI_NUMFRAMES);
117         if (skelnum <= 1)
118                 skelnum = 9;
119         return UHCI_PTR_QH | cpu_to_le32(uhci->skelqh[skelnum]->dma_handle);
120 }
121
122 #include "uhci-debug.c"
123 #include "uhci-q.c"
124 #include "uhci-hub.c"
125
126 /*
127  * Finish up a host controller reset and update the recorded state.
128  */
129 static void finish_reset(struct uhci_hcd *uhci)
130 {
131         int port;
132
133         /* HCRESET doesn't affect the Suspend, Reset, and Resume Detect
134          * bits in the port status and control registers.
135          * We have to clear them by hand.
136          */
137         for (port = 0; port < uhci->rh_numports; ++port)
138                 outw(0, uhci->io_addr + USBPORTSC1 + (port * 2));
139
140         uhci->port_c_suspend = uhci->resuming_ports = 0;
141         uhci->rh_state = UHCI_RH_RESET;
142         uhci->is_stopped = UHCI_IS_STOPPED;
143         uhci_to_hcd(uhci)->state = HC_STATE_HALT;
144         uhci_to_hcd(uhci)->poll_rh = 0;
145
146         uhci->dead = 0;         /* Full reset resurrects the controller */
147 }
148
149 /*
150  * Last rites for a defunct/nonfunctional controller
151  * or one we don't want to use any more.
152  */
153 static void uhci_hc_died(struct uhci_hcd *uhci)
154 {
155         uhci_get_current_frame_number(uhci);
156         uhci_reset_hc(to_pci_dev(uhci_dev(uhci)), uhci->io_addr);
157         finish_reset(uhci);
158         uhci->dead = 1;
159
160         /* The current frame may already be partway finished */
161         ++uhci->frame_number;
162 }
163
164 /*
165  * Initialize a controller that was newly discovered or has lost power
166  * or otherwise been reset while it was suspended.  In none of these cases
167  * can we be sure of its previous state.
168  */
169 static void check_and_reset_hc(struct uhci_hcd *uhci)
170 {
171         if (uhci_check_and_reset_hc(to_pci_dev(uhci_dev(uhci)), uhci->io_addr))
172                 finish_reset(uhci);
173 }
174
175 /*
176  * Store the basic register settings needed by the controller.
177  */
178 static void configure_hc(struct uhci_hcd *uhci)
179 {
180         /* Set the frame length to the default: 1 ms exactly */
181         outb(USBSOF_DEFAULT, uhci->io_addr + USBSOF);
182
183         /* Store the frame list base address */
184         outl(uhci->frame_dma_handle, uhci->io_addr + USBFLBASEADD);
185
186         /* Set the current frame number */
187         outw(uhci->frame_number & UHCI_MAX_SOF_NUMBER,
188                         uhci->io_addr + USBFRNUM);
189
190         /* Mark controller as not halted before we enable interrupts */
191         uhci_to_hcd(uhci)->state = HC_STATE_SUSPENDED;
192         mb();
193
194         /* Enable PIRQ */
195         pci_write_config_word(to_pci_dev(uhci_dev(uhci)), USBLEGSUP,
196                         USBLEGSUP_DEFAULT);
197 }
198
199
200 static int resume_detect_interrupts_are_broken(struct uhci_hcd *uhci)
201 {
202         int port;
203
204         /* If we have to ignore overcurrent events then almost by definition
205          * we can't depend on resume-detect interrupts. */
206         if (ignore_oc)
207                 return 1;
208
209         switch (to_pci_dev(uhci_dev(uhci))->vendor) {
210             default:
211                 break;
212
213             case PCI_VENDOR_ID_GENESYS:
214                 /* Genesys Logic's GL880S controllers don't generate
215                  * resume-detect interrupts.
216                  */
217                 return 1;
218
219             case PCI_VENDOR_ID_INTEL:
220                 /* Some of Intel's USB controllers have a bug that causes
221                  * resume-detect interrupts if any port has an over-current
222                  * condition.  To make matters worse, some motherboards
223                  * hardwire unused USB ports' over-current inputs active!
224                  * To prevent problems, we will not enable resume-detect
225                  * interrupts if any ports are OC.
226                  */
227                 for (port = 0; port < uhci->rh_numports; ++port) {
228                         if (inw(uhci->io_addr + USBPORTSC1 + port * 2) &
229                                         USBPORTSC_OC)
230                                 return 1;
231                 }
232                 break;
233         }
234         return 0;
235 }
236
237 static int remote_wakeup_is_broken(struct uhci_hcd *uhci)
238 {
239         int port;
240         char *sys_info;
241         static char bad_Asus_board[] = "A7V8X";
242
243         /* One of Asus's motherboards has a bug which causes it to
244          * wake up immediately from suspend-to-RAM if any of the ports
245          * are connected.  In such cases we will not set EGSM.
246          */
247         sys_info = dmi_get_system_info(DMI_BOARD_NAME);
248         if (sys_info && !strcmp(sys_info, bad_Asus_board)) {
249                 for (port = 0; port < uhci->rh_numports; ++port) {
250                         if (inw(uhci->io_addr + USBPORTSC1 + port * 2) &
251                                         USBPORTSC_CCS)
252                                 return 1;
253                 }
254         }
255
256         return 0;
257 }
258
259 static void suspend_rh(struct uhci_hcd *uhci, enum uhci_rh_state new_state)
260 __releases(uhci->lock)
261 __acquires(uhci->lock)
262 {
263         int auto_stop;
264         int int_enable, egsm_enable;
265
266         auto_stop = (new_state == UHCI_RH_AUTO_STOPPED);
267         dev_dbg(&uhci_to_hcd(uhci)->self.root_hub->dev,
268                         "%s%s\n", __FUNCTION__,
269                         (auto_stop ? " (auto-stop)" : ""));
270
271         /* If we get a suspend request when we're already auto-stopped
272          * then there's nothing to do.
273          */
274         if (uhci->rh_state == UHCI_RH_AUTO_STOPPED) {
275                 uhci->rh_state = new_state;
276                 return;
277         }
278
279         /* Enable resume-detect interrupts if they work.
280          * Then enter Global Suspend mode if _it_ works, still configured.
281          */
282         egsm_enable = USBCMD_EGSM;
283         uhci->working_RD = 1;
284         int_enable = USBINTR_RESUME;
285         if (remote_wakeup_is_broken(uhci))
286                 egsm_enable = 0;
287         if (resume_detect_interrupts_are_broken(uhci) || !egsm_enable ||
288                         !device_may_wakeup(
289                                 &uhci_to_hcd(uhci)->self.root_hub->dev))
290                 uhci->working_RD = int_enable = 0;
291
292         outw(int_enable, uhci->io_addr + USBINTR);
293         outw(egsm_enable | USBCMD_CF, uhci->io_addr + USBCMD);
294         mb();
295         udelay(5);
296
297         /* If we're auto-stopping then no devices have been attached
298          * for a while, so there shouldn't be any active URBs and the
299          * controller should stop after a few microseconds.  Otherwise
300          * we will give the controller one frame to stop.
301          */
302         if (!auto_stop && !(inw(uhci->io_addr + USBSTS) & USBSTS_HCH)) {
303                 uhci->rh_state = UHCI_RH_SUSPENDING;
304                 spin_unlock_irq(&uhci->lock);
305                 msleep(1);
306                 spin_lock_irq(&uhci->lock);
307                 if (uhci->dead)
308                         return;
309         }
310         if (!(inw(uhci->io_addr + USBSTS) & USBSTS_HCH))
311                 dev_warn(&uhci_to_hcd(uhci)->self.root_hub->dev,
312                         "Controller not stopped yet!\n");
313
314         uhci_get_current_frame_number(uhci);
315
316         uhci->rh_state = new_state;
317         uhci->is_stopped = UHCI_IS_STOPPED;
318         uhci_to_hcd(uhci)->poll_rh = !int_enable;
319
320         uhci_scan_schedule(uhci);
321         uhci_fsbr_off(uhci);
322 }
323
324 static void start_rh(struct uhci_hcd *uhci)
325 {
326         uhci_to_hcd(uhci)->state = HC_STATE_RUNNING;
327         uhci->is_stopped = 0;
328
329         /* Mark it configured and running with a 64-byte max packet.
330          * All interrupts are enabled, even though RESUME won't do anything.
331          */
332         outw(USBCMD_RS | USBCMD_CF | USBCMD_MAXP, uhci->io_addr + USBCMD);
333         outw(USBINTR_TIMEOUT | USBINTR_RESUME | USBINTR_IOC | USBINTR_SP,
334                         uhci->io_addr + USBINTR);
335         mb();
336         uhci->rh_state = UHCI_RH_RUNNING;
337         uhci_to_hcd(uhci)->poll_rh = 1;
338 }
339
340 static void wakeup_rh(struct uhci_hcd *uhci)
341 __releases(uhci->lock)
342 __acquires(uhci->lock)
343 {
344         dev_dbg(&uhci_to_hcd(uhci)->self.root_hub->dev,
345                         "%s%s\n", __FUNCTION__,
346                         uhci->rh_state == UHCI_RH_AUTO_STOPPED ?
347                                 " (auto-start)" : "");
348
349         /* If we are auto-stopped then no devices are attached so there's
350          * no need for wakeup signals.  Otherwise we send Global Resume
351          * for 20 ms.
352          */
353         if (uhci->rh_state == UHCI_RH_SUSPENDED) {
354                 uhci->rh_state = UHCI_RH_RESUMING;
355                 outw(USBCMD_FGR | USBCMD_EGSM | USBCMD_CF,
356                                 uhci->io_addr + USBCMD);
357                 spin_unlock_irq(&uhci->lock);
358                 msleep(20);
359                 spin_lock_irq(&uhci->lock);
360                 if (uhci->dead)
361                         return;
362
363                 /* End Global Resume and wait for EOP to be sent */
364                 outw(USBCMD_CF, uhci->io_addr + USBCMD);
365                 mb();
366                 udelay(4);
367                 if (inw(uhci->io_addr + USBCMD) & USBCMD_FGR)
368                         dev_warn(uhci_dev(uhci), "FGR not stopped yet!\n");
369         }
370
371         start_rh(uhci);
372
373         /* Restart root hub polling */
374         mod_timer(&uhci_to_hcd(uhci)->rh_timer, jiffies);
375 }
376
377 static irqreturn_t uhci_irq(struct usb_hcd *hcd)
378 {
379         struct uhci_hcd *uhci = hcd_to_uhci(hcd);
380         unsigned short status;
381         unsigned long flags;
382
383         /*
384          * Read the interrupt status, and write it back to clear the
385          * interrupt cause.  Contrary to the UHCI specification, the
386          * "HC Halted" status bit is persistent: it is RO, not R/WC.
387          */
388         status = inw(uhci->io_addr + USBSTS);
389         if (!(status & ~USBSTS_HCH))    /* shared interrupt, not mine */
390                 return IRQ_NONE;
391         outw(status, uhci->io_addr + USBSTS);           /* Clear it */
392
393         if (status & ~(USBSTS_USBINT | USBSTS_ERROR | USBSTS_RD)) {
394                 if (status & USBSTS_HSE)
395                         dev_err(uhci_dev(uhci), "host system error, "
396                                         "PCI problems?\n");
397                 if (status & USBSTS_HCPE)
398                         dev_err(uhci_dev(uhci), "host controller process "
399                                         "error, something bad happened!\n");
400                 if (status & USBSTS_HCH) {
401                         spin_lock_irqsave(&uhci->lock, flags);
402                         if (uhci->rh_state >= UHCI_RH_RUNNING) {
403                                 dev_err(uhci_dev(uhci),
404                                         "host controller halted, "
405                                         "very bad!\n");
406                                 if (debug > 1 && errbuf) {
407                                         /* Print the schedule for debugging */
408                                         uhci_sprint_schedule(uhci,
409                                                         errbuf, ERRBUF_LEN);
410                                         lprintk(errbuf);
411                                 }
412                                 uhci_hc_died(uhci);
413
414                                 /* Force a callback in case there are
415                                  * pending unlinks */
416                                 mod_timer(&hcd->rh_timer, jiffies);
417                         }
418                         spin_unlock_irqrestore(&uhci->lock, flags);
419                 }
420         }
421
422         if (status & USBSTS_RD)
423                 usb_hcd_poll_rh_status(hcd);
424         else {
425                 spin_lock_irqsave(&uhci->lock, flags);
426                 uhci_scan_schedule(uhci);
427                 spin_unlock_irqrestore(&uhci->lock, flags);
428         }
429
430         return IRQ_HANDLED;
431 }
432
433 /*
434  * Store the current frame number in uhci->frame_number if the controller
435  * is runnning.  Expand from 11 bits (of which we use only 10) to a
436  * full-sized integer.
437  *
438  * Like many other parts of the driver, this code relies on being polled
439  * more than once per second as long as the controller is running.
440  */
441 static void uhci_get_current_frame_number(struct uhci_hcd *uhci)
442 {
443         if (!uhci->is_stopped) {
444                 unsigned delta;
445
446                 delta = (inw(uhci->io_addr + USBFRNUM) - uhci->frame_number) &
447                                 (UHCI_NUMFRAMES - 1);
448                 uhci->frame_number += delta;
449         }
450 }
451
452 /*
453  * De-allocate all resources
454  */
455 static void release_uhci(struct uhci_hcd *uhci)
456 {
457         int i;
458
459         if (DEBUG_CONFIGURED) {
460                 spin_lock_irq(&uhci->lock);
461                 uhci->is_initialized = 0;
462                 spin_unlock_irq(&uhci->lock);
463
464                 debugfs_remove(uhci->dentry);
465         }
466
467         for (i = 0; i < UHCI_NUM_SKELQH; i++)
468                 uhci_free_qh(uhci, uhci->skelqh[i]);
469
470         uhci_free_td(uhci, uhci->term_td);
471
472         dma_pool_destroy(uhci->qh_pool);
473
474         dma_pool_destroy(uhci->td_pool);
475
476         kfree(uhci->frame_cpu);
477
478         dma_free_coherent(uhci_dev(uhci),
479                         UHCI_NUMFRAMES * sizeof(*uhci->frame),
480                         uhci->frame, uhci->frame_dma_handle);
481 }
482
483 static int uhci_init(struct usb_hcd *hcd)
484 {
485         struct uhci_hcd *uhci = hcd_to_uhci(hcd);
486         unsigned io_size = (unsigned) hcd->rsrc_len;
487         int port;
488
489         uhci->io_addr = (unsigned long) hcd->rsrc_start;
490
491         /* The UHCI spec says devices must have 2 ports, and goes on to say
492          * they may have more but gives no way to determine how many there
493          * are.  However according to the UHCI spec, Bit 7 of the port
494          * status and control register is always set to 1.  So we try to
495          * use this to our advantage.  Another common failure mode when
496          * a nonexistent register is addressed is to return all ones, so
497          * we test for that also.
498          */
499         for (port = 0; port < (io_size - USBPORTSC1) / 2; port++) {
500                 unsigned int portstatus;
501
502                 portstatus = inw(uhci->io_addr + USBPORTSC1 + (port * 2));
503                 if (!(portstatus & 0x0080) || portstatus == 0xffff)
504                         break;
505         }
506         if (debug)
507                 dev_info(uhci_dev(uhci), "detected %d ports\n", port);
508
509         /* Anything greater than 7 is weird so we'll ignore it. */
510         if (port > UHCI_RH_MAXCHILD) {
511                 dev_info(uhci_dev(uhci), "port count misdetected? "
512                                 "forcing to 2 ports\n");
513                 port = 2;
514         }
515         uhci->rh_numports = port;
516
517         /* Kick BIOS off this hardware and reset if the controller
518          * isn't already safely quiescent.
519          */
520         check_and_reset_hc(uhci);
521         return 0;
522 }
523
524 /* Make sure the controller is quiescent and that we're not using it
525  * any more.  This is mainly for the benefit of programs which, like kexec,
526  * expect the hardware to be idle: not doing DMA or generating IRQs.
527  *
528  * This routine may be called in a damaged or failing kernel.  Hence we
529  * do not acquire the spinlock before shutting down the controller.
530  */
531 static void uhci_shutdown(struct pci_dev *pdev)
532 {
533         struct usb_hcd *hcd = (struct usb_hcd *) pci_get_drvdata(pdev);
534
535         uhci_hc_died(hcd_to_uhci(hcd));
536 }
537
538 /*
539  * Allocate a frame list, and then setup the skeleton
540  *
541  * The hardware doesn't really know any difference
542  * in the queues, but the order does matter for the
543  * protocols higher up. The order is:
544  *
545  *  - any isochronous events handled before any
546  *    of the queues. We don't do that here, because
547  *    we'll create the actual TD entries on demand.
548  *  - The first queue is the interrupt queue.
549  *  - The second queue is the control queue, split into low- and full-speed
550  *  - The third queue is bulk queue.
551  *  - The fourth queue is the bandwidth reclamation queue, which loops back
552  *    to the full-speed control queue.
553  */
554 static int uhci_start(struct usb_hcd *hcd)
555 {
556         struct uhci_hcd *uhci = hcd_to_uhci(hcd);
557         int retval = -EBUSY;
558         int i;
559         struct dentry *dentry;
560
561         hcd->uses_new_polling = 1;
562
563         spin_lock_init(&uhci->lock);
564         setup_timer(&uhci->fsbr_timer, uhci_fsbr_timeout,
565                         (unsigned long) uhci);
566         INIT_LIST_HEAD(&uhci->idle_qh_list);
567         init_waitqueue_head(&uhci->waitqh);
568
569         if (DEBUG_CONFIGURED) {
570                 dentry = debugfs_create_file(hcd->self.bus_name,
571                                 S_IFREG|S_IRUGO|S_IWUSR, uhci_debugfs_root,
572                                 uhci, &uhci_debug_operations);
573                 if (!dentry) {
574                         dev_err(uhci_dev(uhci), "couldn't create uhci "
575                                         "debugfs entry\n");
576                         retval = -ENOMEM;
577                         goto err_create_debug_entry;
578                 }
579                 uhci->dentry = dentry;
580         }
581
582         uhci->frame = dma_alloc_coherent(uhci_dev(uhci),
583                         UHCI_NUMFRAMES * sizeof(*uhci->frame),
584                         &uhci->frame_dma_handle, 0);
585         if (!uhci->frame) {
586                 dev_err(uhci_dev(uhci), "unable to allocate "
587                                 "consistent memory for frame list\n");
588                 goto err_alloc_frame;
589         }
590         memset(uhci->frame, 0, UHCI_NUMFRAMES * sizeof(*uhci->frame));
591
592         uhci->frame_cpu = kcalloc(UHCI_NUMFRAMES, sizeof(*uhci->frame_cpu),
593                         GFP_KERNEL);
594         if (!uhci->frame_cpu) {
595                 dev_err(uhci_dev(uhci), "unable to allocate "
596                                 "memory for frame pointers\n");
597                 goto err_alloc_frame_cpu;
598         }
599
600         uhci->td_pool = dma_pool_create("uhci_td", uhci_dev(uhci),
601                         sizeof(struct uhci_td), 16, 0);
602         if (!uhci->td_pool) {
603                 dev_err(uhci_dev(uhci), "unable to create td dma_pool\n");
604                 goto err_create_td_pool;
605         }
606
607         uhci->qh_pool = dma_pool_create("uhci_qh", uhci_dev(uhci),
608                         sizeof(struct uhci_qh), 16, 0);
609         if (!uhci->qh_pool) {
610                 dev_err(uhci_dev(uhci), "unable to create qh dma_pool\n");
611                 goto err_create_qh_pool;
612         }
613
614         uhci->term_td = uhci_alloc_td(uhci);
615         if (!uhci->term_td) {
616                 dev_err(uhci_dev(uhci), "unable to allocate terminating TD\n");
617                 goto err_alloc_term_td;
618         }
619
620         for (i = 0; i < UHCI_NUM_SKELQH; i++) {
621                 uhci->skelqh[i] = uhci_alloc_qh(uhci, NULL, NULL);
622                 if (!uhci->skelqh[i]) {
623                         dev_err(uhci_dev(uhci), "unable to allocate QH\n");
624                         goto err_alloc_skelqh;
625                 }
626         }
627
628         /*
629          * 8 Interrupt queues; link all higher int queues to int1,
630          * then link int1 to control and control to bulk
631          */
632         uhci->skel_int128_qh->link =
633                         uhci->skel_int64_qh->link =
634                         uhci->skel_int32_qh->link =
635                         uhci->skel_int16_qh->link =
636                         uhci->skel_int8_qh->link =
637                         uhci->skel_int4_qh->link =
638                         uhci->skel_int2_qh->link = UHCI_PTR_QH |
639                         cpu_to_le32(uhci->skel_int1_qh->dma_handle);
640
641         uhci->skel_int1_qh->link = UHCI_PTR_QH |
642                         cpu_to_le32(uhci->skel_ls_control_qh->dma_handle);
643         uhci->skel_ls_control_qh->link = UHCI_PTR_QH |
644                         cpu_to_le32(uhci->skel_fs_control_qh->dma_handle);
645         uhci->skel_fs_control_qh->link = UHCI_PTR_QH |
646                         cpu_to_le32(uhci->skel_bulk_qh->dma_handle);
647         uhci->skel_bulk_qh->link = UHCI_PTR_QH |
648                         cpu_to_le32(uhci->skel_term_qh->dma_handle);
649
650         /* This dummy TD is to work around a bug in Intel PIIX controllers */
651         uhci_fill_td(uhci->term_td, 0, uhci_explen(0) |
652                 (0x7f << TD_TOKEN_DEVADDR_SHIFT) | USB_PID_IN, 0);
653         uhci->term_td->link = cpu_to_le32(uhci->term_td->dma_handle);
654
655         uhci->skel_term_qh->link = UHCI_PTR_TERM;
656         uhci->skel_term_qh->element = cpu_to_le32(uhci->term_td->dma_handle);
657
658         /*
659          * Fill the frame list: make all entries point to the proper
660          * interrupt queue.
661          */
662         for (i = 0; i < UHCI_NUMFRAMES; i++) {
663
664                 /* Only place we don't use the frame list routines */
665                 uhci->frame[i] = uhci_frame_skel_link(uhci, i);
666         }
667
668         /*
669          * Some architectures require a full mb() to enforce completion of
670          * the memory writes above before the I/O transfers in configure_hc().
671          */
672         mb();
673
674         configure_hc(uhci);
675         uhci->is_initialized = 1;
676         start_rh(uhci);
677         return 0;
678
679 /*
680  * error exits:
681  */
682 err_alloc_skelqh:
683         for (i = 0; i < UHCI_NUM_SKELQH; i++) {
684                 if (uhci->skelqh[i])
685                         uhci_free_qh(uhci, uhci->skelqh[i]);
686         }
687
688         uhci_free_td(uhci, uhci->term_td);
689
690 err_alloc_term_td:
691         dma_pool_destroy(uhci->qh_pool);
692
693 err_create_qh_pool:
694         dma_pool_destroy(uhci->td_pool);
695
696 err_create_td_pool:
697         kfree(uhci->frame_cpu);
698
699 err_alloc_frame_cpu:
700         dma_free_coherent(uhci_dev(uhci),
701                         UHCI_NUMFRAMES * sizeof(*uhci->frame),
702                         uhci->frame, uhci->frame_dma_handle);
703
704 err_alloc_frame:
705         debugfs_remove(uhci->dentry);
706
707 err_create_debug_entry:
708         return retval;
709 }
710
711 static void uhci_stop(struct usb_hcd *hcd)
712 {
713         struct uhci_hcd *uhci = hcd_to_uhci(hcd);
714
715         spin_lock_irq(&uhci->lock);
716         if (test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags) && !uhci->dead)
717                 uhci_hc_died(uhci);
718         uhci_scan_schedule(uhci);
719         spin_unlock_irq(&uhci->lock);
720
721         del_timer_sync(&uhci->fsbr_timer);
722         release_uhci(uhci);
723 }
724
725 #ifdef CONFIG_PM
726 static int uhci_rh_suspend(struct usb_hcd *hcd)
727 {
728         struct uhci_hcd *uhci = hcd_to_uhci(hcd);
729         int rc = 0;
730
731         spin_lock_irq(&uhci->lock);
732         if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags))
733                 rc = -ESHUTDOWN;
734         else if (!uhci->dead)
735                 suspend_rh(uhci, UHCI_RH_SUSPENDED);
736         spin_unlock_irq(&uhci->lock);
737         return rc;
738 }
739
740 static int uhci_rh_resume(struct usb_hcd *hcd)
741 {
742         struct uhci_hcd *uhci = hcd_to_uhci(hcd);
743         int rc = 0;
744
745         spin_lock_irq(&uhci->lock);
746         if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)) {
747                 dev_warn(&hcd->self.root_hub->dev, "HC isn't running!\n");
748                 rc = -ESHUTDOWN;
749         } else if (!uhci->dead)
750                 wakeup_rh(uhci);
751         spin_unlock_irq(&uhci->lock);
752         return rc;
753 }
754
755 static int uhci_suspend(struct usb_hcd *hcd, pm_message_t message)
756 {
757         struct uhci_hcd *uhci = hcd_to_uhci(hcd);
758         int rc = 0;
759
760         dev_dbg(uhci_dev(uhci), "%s\n", __FUNCTION__);
761
762         spin_lock_irq(&uhci->lock);
763         if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags) || uhci->dead)
764                 goto done_okay;         /* Already suspended or dead */
765
766         if (uhci->rh_state > UHCI_RH_SUSPENDED) {
767                 dev_warn(uhci_dev(uhci), "Root hub isn't suspended!\n");
768                 rc = -EBUSY;
769                 goto done;
770         };
771
772         /* All PCI host controllers are required to disable IRQ generation
773          * at the source, so we must turn off PIRQ.
774          */
775         pci_write_config_word(to_pci_dev(uhci_dev(uhci)), USBLEGSUP, 0);
776         mb();
777         hcd->poll_rh = 0;
778
779         /* FIXME: Enable non-PME# remote wakeup? */
780
781         /* make sure snapshot being resumed re-enumerates everything */
782         if (message.event == PM_EVENT_PRETHAW)
783                 uhci_hc_died(uhci);
784
785 done_okay:
786         clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
787 done:
788         spin_unlock_irq(&uhci->lock);
789         return rc;
790 }
791
792 static int uhci_resume(struct usb_hcd *hcd)
793 {
794         struct uhci_hcd *uhci = hcd_to_uhci(hcd);
795
796         dev_dbg(uhci_dev(uhci), "%s\n", __FUNCTION__);
797
798         /* Since we aren't in D3 any more, it's safe to set this flag
799          * even if the controller was dead.
800          */
801         set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
802         mb();
803
804         spin_lock_irq(&uhci->lock);
805
806         /* FIXME: Disable non-PME# remote wakeup? */
807
808         /* The firmware or a boot kernel may have changed the controller
809          * settings during a system wakeup.  Check it and reconfigure
810          * to avoid problems.
811          */
812         check_and_reset_hc(uhci);
813
814         /* If the controller was dead before, it's back alive now */
815         configure_hc(uhci);
816
817         if (uhci->rh_state == UHCI_RH_RESET) {
818
819                 /* The controller had to be reset */
820                 usb_root_hub_lost_power(hcd->self.root_hub);
821                 suspend_rh(uhci, UHCI_RH_SUSPENDED);
822         }
823
824         spin_unlock_irq(&uhci->lock);
825
826         if (!uhci->working_RD) {
827                 /* Suspended root hub needs to be polled */
828                 hcd->poll_rh = 1;
829                 usb_hcd_poll_rh_status(hcd);
830         }
831         return 0;
832 }
833 #endif
834
835 /* Wait until a particular device/endpoint's QH is idle, and free it */
836 static void uhci_hcd_endpoint_disable(struct usb_hcd *hcd,
837                 struct usb_host_endpoint *hep)
838 {
839         struct uhci_hcd *uhci = hcd_to_uhci(hcd);
840         struct uhci_qh *qh;
841
842         spin_lock_irq(&uhci->lock);
843         qh = (struct uhci_qh *) hep->hcpriv;
844         if (qh == NULL)
845                 goto done;
846
847         while (qh->state != QH_STATE_IDLE) {
848                 ++uhci->num_waiting;
849                 spin_unlock_irq(&uhci->lock);
850                 wait_event_interruptible(uhci->waitqh,
851                                 qh->state == QH_STATE_IDLE);
852                 spin_lock_irq(&uhci->lock);
853                 --uhci->num_waiting;
854         }
855
856         uhci_free_qh(uhci, qh);
857 done:
858         spin_unlock_irq(&uhci->lock);
859 }
860
861 static int uhci_hcd_get_frame_number(struct usb_hcd *hcd)
862 {
863         struct uhci_hcd *uhci = hcd_to_uhci(hcd);
864         unsigned frame_number;
865         unsigned delta;
866
867         /* Minimize latency by avoiding the spinlock */
868         frame_number = uhci->frame_number;
869         barrier();
870         delta = (inw(uhci->io_addr + USBFRNUM) - frame_number) &
871                         (UHCI_NUMFRAMES - 1);
872         return frame_number + delta;
873 }
874
875 static const char hcd_name[] = "uhci_hcd";
876
877 static const struct hc_driver uhci_driver = {
878         .description =          hcd_name,
879         .product_desc =         "UHCI Host Controller",
880         .hcd_priv_size =        sizeof(struct uhci_hcd),
881
882         /* Generic hardware linkage */
883         .irq =                  uhci_irq,
884         .flags =                HCD_USB11,
885
886         /* Basic lifecycle operations */
887         .reset =                uhci_init,
888         .start =                uhci_start,
889 #ifdef CONFIG_PM
890         .suspend =              uhci_suspend,
891         .resume =               uhci_resume,
892         .bus_suspend =          uhci_rh_suspend,
893         .bus_resume =           uhci_rh_resume,
894 #endif
895         .stop =                 uhci_stop,
896
897         .urb_enqueue =          uhci_urb_enqueue,
898         .urb_dequeue =          uhci_urb_dequeue,
899
900         .endpoint_disable =     uhci_hcd_endpoint_disable,
901         .get_frame_number =     uhci_hcd_get_frame_number,
902
903         .hub_status_data =      uhci_hub_status_data,
904         .hub_control =          uhci_hub_control,
905 };
906
907 static const struct pci_device_id uhci_pci_ids[] = { {
908         /* handle any USB UHCI controller */
909         PCI_DEVICE_CLASS(PCI_CLASS_SERIAL_USB_UHCI, ~0),
910         .driver_data =  (unsigned long) &uhci_driver,
911         }, { /* end: all zeroes */ }
912 };
913
914 MODULE_DEVICE_TABLE(pci, uhci_pci_ids);
915
916 static struct pci_driver uhci_pci_driver = {
917         .name =         (char *)hcd_name,
918         .id_table =     uhci_pci_ids,
919
920         .probe =        usb_hcd_pci_probe,
921         .remove =       usb_hcd_pci_remove,
922         .shutdown =     uhci_shutdown,
923
924 #ifdef  CONFIG_PM
925         .suspend =      usb_hcd_pci_suspend,
926         .resume =       usb_hcd_pci_resume,
927 #endif  /* PM */
928 };
929  
930 static int __init uhci_hcd_init(void)
931 {
932         int retval = -ENOMEM;
933
934         printk(KERN_INFO DRIVER_DESC " " DRIVER_VERSION "%s\n",
935                         ignore_oc ? ", overcurrent ignored" : "");
936
937         if (usb_disabled())
938                 return -ENODEV;
939
940         if (DEBUG_CONFIGURED) {
941                 errbuf = kmalloc(ERRBUF_LEN, GFP_KERNEL);
942                 if (!errbuf)
943                         goto errbuf_failed;
944                 uhci_debugfs_root = debugfs_create_dir("uhci", NULL);
945                 if (!uhci_debugfs_root)
946                         goto debug_failed;
947         }
948
949         uhci_up_cachep = kmem_cache_create("uhci_urb_priv",
950                 sizeof(struct urb_priv), 0, 0, NULL, NULL);
951         if (!uhci_up_cachep)
952                 goto up_failed;
953
954         retval = pci_register_driver(&uhci_pci_driver);
955         if (retval)
956                 goto init_failed;
957
958         return 0;
959
960 init_failed:
961         kmem_cache_destroy(uhci_up_cachep);
962
963 up_failed:
964         debugfs_remove(uhci_debugfs_root);
965
966 debug_failed:
967         kfree(errbuf);
968
969 errbuf_failed:
970
971         return retval;
972 }
973
974 static void __exit uhci_hcd_cleanup(void) 
975 {
976         pci_unregister_driver(&uhci_pci_driver);
977         kmem_cache_destroy(uhci_up_cachep);
978         debugfs_remove(uhci_debugfs_root);
979         kfree(errbuf);
980 }
981
982 module_init(uhci_hcd_init);
983 module_exit(uhci_hcd_cleanup);
984
985 MODULE_AUTHOR(DRIVER_AUTHOR);
986 MODULE_DESCRIPTION(DRIVER_DESC);
987 MODULE_LICENSE("GPL");