Version:  2.0.40 2.2.26 2.4.37 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17

Linux/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 2004-2007 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/usb/hcd.h>
 42 #include <linux/bitops.h>
 43 #include <linux/dmi.h>
 44 
 45 #include <asm/uaccess.h>
 46 #include <asm/io.h>
 47 #include <asm/irq.h>
 48 
 49 #include "uhci-hcd.h"
 50 
 51 /*
 52  * Version Information
 53  */
 54 #define DRIVER_AUTHOR                                                   \
 55         "Linus 'Frodo Rabbit' Torvalds, Johannes Erdfelt, "             \
 56         "Randy Dunlap, Georg Acher, Deti Fliegl, Thomas Sailer, "       \
 57         "Roman Weissgaerber, Alan Stern"
 58 #define DRIVER_DESC "USB Universal Host Controller Interface driver"
 59 
 60 /* for flakey hardware, ignore overcurrent indicators */
 61 static bool ignore_oc;
 62 module_param(ignore_oc, bool, S_IRUGO);
 63 MODULE_PARM_DESC(ignore_oc, "ignore hardware overcurrent indications");
 64 
 65 /*
 66  * debug = 0, no debugging messages
 67  * debug = 1, dump failed URBs except for stalls
 68  * debug = 2, dump all failed URBs (including stalls)
 69  *            show all queues in /sys/kernel/debug/uhci/[pci_addr]
 70  * debug = 3, show all TDs in URBs when dumping
 71  */
 72 #ifdef CONFIG_DYNAMIC_DEBUG
 73 
 74 static int debug = 1;
 75 module_param(debug, int, S_IRUGO | S_IWUSR);
 76 MODULE_PARM_DESC(debug, "Debug level");
 77 static char *errbuf;
 78 
 79 #else
 80 
 81 #define debug 0
 82 #define errbuf NULL
 83 
 84 #endif
 85 
 86 
 87 #define ERRBUF_LEN    (32 * 1024)
 88 
 89 static struct kmem_cache *uhci_up_cachep;       /* urb_priv */
 90 
 91 static void suspend_rh(struct uhci_hcd *uhci, enum uhci_rh_state new_state);
 92 static void wakeup_rh(struct uhci_hcd *uhci);
 93 static void uhci_get_current_frame_number(struct uhci_hcd *uhci);
 94 
 95 /*
 96  * Calculate the link pointer DMA value for the first Skeleton QH in a frame.
 97  */
 98 static __hc32 uhci_frame_skel_link(struct uhci_hcd *uhci, int frame)
 99 {
100         int skelnum;
101 
102         /*
103          * The interrupt queues will be interleaved as evenly as possible.
104          * There's not much to be done about period-1 interrupts; they have
105          * to occur in every frame.  But we can schedule period-2 interrupts
106          * in odd-numbered frames, period-4 interrupts in frames congruent
107          * to 2 (mod 4), and so on.  This way each frame only has two
108          * interrupt QHs, which will help spread out bandwidth utilization.
109          *
110          * ffs (Find First bit Set) does exactly what we need:
111          * 1,3,5,...  => ffs = 0 => use period-2 QH = skelqh[8],
112          * 2,6,10,... => ffs = 1 => use period-4 QH = skelqh[7], etc.
113          * ffs >= 7 => not on any high-period queue, so use
114          *      period-1 QH = skelqh[9].
115          * Add in UHCI_NUMFRAMES to insure at least one bit is set.
116          */
117         skelnum = 8 - (int) __ffs(frame | UHCI_NUMFRAMES);
118         if (skelnum <= 1)
119                 skelnum = 9;
120         return LINK_TO_QH(uhci, uhci->skelqh[skelnum]);
121 }
122 
123 #include "uhci-debug.c"
124 #include "uhci-q.c"
125 #include "uhci-hub.c"
126 
127 /*
128  * Finish up a host controller reset and update the recorded state.
129  */
130 static void finish_reset(struct uhci_hcd *uhci)
131 {
132         int port;
133 
134         /* HCRESET doesn't affect the Suspend, Reset, and Resume Detect
135          * bits in the port status and control registers.
136          * We have to clear them by hand.
137          */
138         for (port = 0; port < uhci->rh_numports; ++port)
139                 uhci_writew(uhci, 0, USBPORTSC1 + (port * 2));
140 
141         uhci->port_c_suspend = uhci->resuming_ports = 0;
142         uhci->rh_state = UHCI_RH_RESET;
143         uhci->is_stopped = UHCI_IS_STOPPED;
144         clear_bit(HCD_FLAG_POLL_RH, &uhci_to_hcd(uhci)->flags);
145 }
146 
147 /*
148  * Last rites for a defunct/nonfunctional controller
149  * or one we don't want to use any more.
150  */
151 static void uhci_hc_died(struct uhci_hcd *uhci)
152 {
153         uhci_get_current_frame_number(uhci);
154         uhci->reset_hc(uhci);
155         finish_reset(uhci);
156         uhci->dead = 1;
157 
158         /* The current frame may already be partway finished */
159         ++uhci->frame_number;
160 }
161 
162 /*
163  * Initialize a controller that was newly discovered or has lost power
164  * or otherwise been reset while it was suspended.  In none of these cases
165  * can we be sure of its previous state.
166  */
167 static void check_and_reset_hc(struct uhci_hcd *uhci)
168 {
169         if (uhci->check_and_reset_hc(uhci))
170                 finish_reset(uhci);
171 }
172 
173 #if defined(CONFIG_USB_UHCI_SUPPORT_NON_PCI_HC)
174 /*
175  * The two functions below are generic reset functions that are used on systems
176  * that do not have keyboard and mouse legacy support. We assume that we are
177  * running on such a system if CONFIG_USB_UHCI_SUPPORT_NON_PCI_HC is defined.
178  */
179 
180 /*
181  * Make sure the controller is completely inactive, unable to
182  * generate interrupts or do DMA.
183  */
184 static void uhci_generic_reset_hc(struct uhci_hcd *uhci)
185 {
186         /* Reset the HC - this will force us to get a
187          * new notification of any already connected
188          * ports due to the virtual disconnect that it
189          * implies.
190          */
191         uhci_writew(uhci, USBCMD_HCRESET, USBCMD);
192         mb();
193         udelay(5);
194         if (uhci_readw(uhci, USBCMD) & USBCMD_HCRESET)
195                 dev_warn(uhci_dev(uhci), "HCRESET not completed yet!\n");
196 
197         /* Just to be safe, disable interrupt requests and
198          * make sure the controller is stopped.
199          */
200         uhci_writew(uhci, 0, USBINTR);
201         uhci_writew(uhci, 0, USBCMD);
202 }
203 
204 /*
205  * Initialize a controller that was newly discovered or has just been
206  * resumed.  In either case we can't be sure of its previous state.
207  *
208  * Returns: 1 if the controller was reset, 0 otherwise.
209  */
210 static int uhci_generic_check_and_reset_hc(struct uhci_hcd *uhci)
211 {
212         unsigned int cmd, intr;
213 
214         /*
215          * When restarting a suspended controller, we expect all the
216          * settings to be the same as we left them:
217          *
218          *      Controller is stopped and configured with EGSM set;
219          *      No interrupts enabled except possibly Resume Detect.
220          *
221          * If any of these conditions are violated we do a complete reset.
222          */
223 
224         cmd = uhci_readw(uhci, USBCMD);
225         if ((cmd & USBCMD_RS) || !(cmd & USBCMD_CF) || !(cmd & USBCMD_EGSM)) {
226                 dev_dbg(uhci_dev(uhci), "%s: cmd = 0x%04x\n",
227                                 __func__, cmd);
228                 goto reset_needed;
229         }
230 
231         intr = uhci_readw(uhci, USBINTR);
232         if (intr & (~USBINTR_RESUME)) {
233                 dev_dbg(uhci_dev(uhci), "%s: intr = 0x%04x\n",
234                                 __func__, intr);
235                 goto reset_needed;
236         }
237         return 0;
238 
239 reset_needed:
240         dev_dbg(uhci_dev(uhci), "Performing full reset\n");
241         uhci_generic_reset_hc(uhci);
242         return 1;
243 }
244 #endif /* CONFIG_USB_UHCI_SUPPORT_NON_PCI_HC */
245 
246 /*
247  * Store the basic register settings needed by the controller.
248  */
249 static void configure_hc(struct uhci_hcd *uhci)
250 {
251         /* Set the frame length to the default: 1 ms exactly */
252         uhci_writeb(uhci, USBSOF_DEFAULT, USBSOF);
253 
254         /* Store the frame list base address */
255         uhci_writel(uhci, uhci->frame_dma_handle, USBFLBASEADD);
256 
257         /* Set the current frame number */
258         uhci_writew(uhci, uhci->frame_number & UHCI_MAX_SOF_NUMBER,
259                         USBFRNUM);
260 
261         /* perform any arch/bus specific configuration */
262         if (uhci->configure_hc)
263                 uhci->configure_hc(uhci);
264 }
265 
266 static int resume_detect_interrupts_are_broken(struct uhci_hcd *uhci)
267 {
268         /* If we have to ignore overcurrent events then almost by definition
269          * we can't depend on resume-detect interrupts. */
270         if (ignore_oc)
271                 return 1;
272 
273         return uhci->resume_detect_interrupts_are_broken ?
274                 uhci->resume_detect_interrupts_are_broken(uhci) : 0;
275 }
276 
277 static int global_suspend_mode_is_broken(struct uhci_hcd *uhci)
278 {
279         return uhci->global_suspend_mode_is_broken ?
280                 uhci->global_suspend_mode_is_broken(uhci) : 0;
281 }
282 
283 static void suspend_rh(struct uhci_hcd *uhci, enum uhci_rh_state new_state)
284 __releases(uhci->lock)
285 __acquires(uhci->lock)
286 {
287         int auto_stop;
288         int int_enable, egsm_enable, wakeup_enable;
289         struct usb_device *rhdev = uhci_to_hcd(uhci)->self.root_hub;
290 
291         auto_stop = (new_state == UHCI_RH_AUTO_STOPPED);
292         dev_dbg(&rhdev->dev, "%s%s\n", __func__,
293                         (auto_stop ? " (auto-stop)" : ""));
294 
295         /* Start off by assuming Resume-Detect interrupts and EGSM work
296          * and that remote wakeups should be enabled.
297          */
298         egsm_enable = USBCMD_EGSM;
299         int_enable = USBINTR_RESUME;
300         wakeup_enable = 1;
301 
302         /*
303          * In auto-stop mode, we must be able to detect new connections.
304          * The user can force us to poll by disabling remote wakeup;
305          * otherwise we will use the EGSM/RD mechanism.
306          */
307         if (auto_stop) {
308                 if (!device_may_wakeup(&rhdev->dev))
309                         egsm_enable = int_enable = 0;
310         }
311 
312 #ifdef CONFIG_PM
313         /*
314          * In bus-suspend mode, we use the wakeup setting specified
315          * for the root hub.
316          */
317         else {
318                 if (!rhdev->do_remote_wakeup)
319                         wakeup_enable = 0;
320         }
321 #endif
322 
323         /*
324          * UHCI doesn't distinguish between wakeup requests from downstream
325          * devices and local connect/disconnect events.  There's no way to
326          * enable one without the other; both are controlled by EGSM.  Thus
327          * if wakeups are disallowed then EGSM must be turned off -- in which
328          * case remote wakeup requests from downstream during system sleep
329          * will be lost.
330          *
331          * In addition, if EGSM is broken then we can't use it.  Likewise,
332          * if Resume-Detect interrupts are broken then we can't use them.
333          *
334          * Finally, neither EGSM nor RD is useful by itself.  Without EGSM,
335          * the RD status bit will never get set.  Without RD, the controller
336          * won't generate interrupts to tell the system about wakeup events.
337          */
338         if (!wakeup_enable || global_suspend_mode_is_broken(uhci) ||
339                         resume_detect_interrupts_are_broken(uhci))
340                 egsm_enable = int_enable = 0;
341 
342         uhci->RD_enable = !!int_enable;
343         uhci_writew(uhci, int_enable, USBINTR);
344         uhci_writew(uhci, egsm_enable | USBCMD_CF, USBCMD);
345         mb();
346         udelay(5);
347 
348         /* If we're auto-stopping then no devices have been attached
349          * for a while, so there shouldn't be any active URBs and the
350          * controller should stop after a few microseconds.  Otherwise
351          * we will give the controller one frame to stop.
352          */
353         if (!auto_stop && !(uhci_readw(uhci, USBSTS) & USBSTS_HCH)) {
354                 uhci->rh_state = UHCI_RH_SUSPENDING;
355                 spin_unlock_irq(&uhci->lock);
356                 msleep(1);
357                 spin_lock_irq(&uhci->lock);
358                 if (uhci->dead)
359                         return;
360         }
361         if (!(uhci_readw(uhci, USBSTS) & USBSTS_HCH))
362                 dev_warn(uhci_dev(uhci), "Controller not stopped yet!\n");
363 
364         uhci_get_current_frame_number(uhci);
365 
366         uhci->rh_state = new_state;
367         uhci->is_stopped = UHCI_IS_STOPPED;
368 
369         /*
370          * If remote wakeup is enabled but either EGSM or RD interrupts
371          * doesn't work, then we won't get an interrupt when a wakeup event
372          * occurs.  Thus the suspended root hub needs to be polled.
373          */
374         if (wakeup_enable && (!int_enable || !egsm_enable))
375                 set_bit(HCD_FLAG_POLL_RH, &uhci_to_hcd(uhci)->flags);
376         else
377                 clear_bit(HCD_FLAG_POLL_RH, &uhci_to_hcd(uhci)->flags);
378 
379         uhci_scan_schedule(uhci);
380         uhci_fsbr_off(uhci);
381 }
382 
383 static void start_rh(struct uhci_hcd *uhci)
384 {
385         uhci->is_stopped = 0;
386 
387         /* Mark it configured and running with a 64-byte max packet.
388          * All interrupts are enabled, even though RESUME won't do anything.
389          */
390         uhci_writew(uhci, USBCMD_RS | USBCMD_CF | USBCMD_MAXP, USBCMD);
391         uhci_writew(uhci, USBINTR_TIMEOUT | USBINTR_RESUME |
392                 USBINTR_IOC | USBINTR_SP, USBINTR);
393         mb();
394         uhci->rh_state = UHCI_RH_RUNNING;
395         set_bit(HCD_FLAG_POLL_RH, &uhci_to_hcd(uhci)->flags);
396 }
397 
398 static void wakeup_rh(struct uhci_hcd *uhci)
399 __releases(uhci->lock)
400 __acquires(uhci->lock)
401 {
402         dev_dbg(&uhci_to_hcd(uhci)->self.root_hub->dev,
403                         "%s%s\n", __func__,
404                         uhci->rh_state == UHCI_RH_AUTO_STOPPED ?
405                                 " (auto-start)" : "");
406 
407         /* If we are auto-stopped then no devices are attached so there's
408          * no need for wakeup signals.  Otherwise we send Global Resume
409          * for 20 ms.
410          */
411         if (uhci->rh_state == UHCI_RH_SUSPENDED) {
412                 unsigned egsm;
413 
414                 /* Keep EGSM on if it was set before */
415                 egsm = uhci_readw(uhci, USBCMD) & USBCMD_EGSM;
416                 uhci->rh_state = UHCI_RH_RESUMING;
417                 uhci_writew(uhci, USBCMD_FGR | USBCMD_CF | egsm, USBCMD);
418                 spin_unlock_irq(&uhci->lock);
419                 msleep(20);
420                 spin_lock_irq(&uhci->lock);
421                 if (uhci->dead)
422                         return;
423 
424                 /* End Global Resume and wait for EOP to be sent */
425                 uhci_writew(uhci, USBCMD_CF, USBCMD);
426                 mb();
427                 udelay(4);
428                 if (uhci_readw(uhci, USBCMD) & USBCMD_FGR)
429                         dev_warn(uhci_dev(uhci), "FGR not stopped yet!\n");
430         }
431 
432         start_rh(uhci);
433 
434         /* Restart root hub polling */
435         mod_timer(&uhci_to_hcd(uhci)->rh_timer, jiffies);
436 }
437 
438 static irqreturn_t uhci_irq(struct usb_hcd *hcd)
439 {
440         struct uhci_hcd *uhci = hcd_to_uhci(hcd);
441         unsigned short status;
442 
443         /*
444          * Read the interrupt status, and write it back to clear the
445          * interrupt cause.  Contrary to the UHCI specification, the
446          * "HC Halted" status bit is persistent: it is RO, not R/WC.
447          */
448         status = uhci_readw(uhci, USBSTS);
449         if (!(status & ~USBSTS_HCH))    /* shared interrupt, not mine */
450                 return IRQ_NONE;
451         uhci_writew(uhci, status, USBSTS);              /* Clear it */
452 
453         spin_lock(&uhci->lock);
454         if (unlikely(!uhci->is_initialized))    /* not yet configured */
455                 goto done;
456 
457         if (status & ~(USBSTS_USBINT | USBSTS_ERROR | USBSTS_RD)) {
458                 if (status & USBSTS_HSE)
459                         dev_err(uhci_dev(uhci),
460                                 "host system error, PCI problems?\n");
461                 if (status & USBSTS_HCPE)
462                         dev_err(uhci_dev(uhci),
463                                 "host controller process error, something bad happened!\n");
464                 if (status & USBSTS_HCH) {
465                         if (uhci->rh_state >= UHCI_RH_RUNNING) {
466                                 dev_err(uhci_dev(uhci),
467                                         "host controller halted, very bad!\n");
468                                 if (debug > 1 && errbuf) {
469                                         /* Print the schedule for debugging */
470                                         uhci_sprint_schedule(uhci, errbuf,
471                                                 ERRBUF_LEN - EXTRA_SPACE);
472                                         lprintk(errbuf);
473                                 }
474                                 uhci_hc_died(uhci);
475                                 usb_hc_died(hcd);
476 
477                                 /* Force a callback in case there are
478                                  * pending unlinks */
479                                 mod_timer(&hcd->rh_timer, jiffies);
480                         }
481                 }
482         }
483 
484         if (status & USBSTS_RD) {
485                 spin_unlock(&uhci->lock);
486                 usb_hcd_poll_rh_status(hcd);
487         } else {
488                 uhci_scan_schedule(uhci);
489  done:
490                 spin_unlock(&uhci->lock);
491         }
492 
493         return IRQ_HANDLED;
494 }
495 
496 /*
497  * Store the current frame number in uhci->frame_number if the controller
498  * is running.  Expand from 11 bits (of which we use only 10) to a
499  * full-sized integer.
500  *
501  * Like many other parts of the driver, this code relies on being polled
502  * more than once per second as long as the controller is running.
503  */
504 static void uhci_get_current_frame_number(struct uhci_hcd *uhci)
505 {
506         if (!uhci->is_stopped) {
507                 unsigned delta;
508 
509                 delta = (uhci_readw(uhci, USBFRNUM) - uhci->frame_number) &
510                                 (UHCI_NUMFRAMES - 1);
511                 uhci->frame_number += delta;
512         }
513 }
514 
515 /*
516  * De-allocate all resources
517  */
518 static void release_uhci(struct uhci_hcd *uhci)
519 {
520         int i;
521 
522 
523         spin_lock_irq(&uhci->lock);
524         uhci->is_initialized = 0;
525         spin_unlock_irq(&uhci->lock);
526 
527         debugfs_remove(uhci->dentry);
528 
529         for (i = 0; i < UHCI_NUM_SKELQH; i++)
530                 uhci_free_qh(uhci, uhci->skelqh[i]);
531 
532         uhci_free_td(uhci, uhci->term_td);
533 
534         dma_pool_destroy(uhci->qh_pool);
535 
536         dma_pool_destroy(uhci->td_pool);
537 
538         kfree(uhci->frame_cpu);
539 
540         dma_free_coherent(uhci_dev(uhci),
541                         UHCI_NUMFRAMES * sizeof(*uhci->frame),
542                         uhci->frame, uhci->frame_dma_handle);
543 }
544 
545 /*
546  * Allocate a frame list, and then setup the skeleton
547  *
548  * The hardware doesn't really know any difference
549  * in the queues, but the order does matter for the
550  * protocols higher up.  The order in which the queues
551  * are encountered by the hardware is:
552  *
553  *  - All isochronous events are handled before any
554  *    of the queues. We don't do that here, because
555  *    we'll create the actual TD entries on demand.
556  *  - The first queue is the high-period interrupt queue.
557  *  - The second queue is the period-1 interrupt and async
558  *    (low-speed control, full-speed control, then bulk) queue.
559  *  - The third queue is the terminating bandwidth reclamation queue,
560  *    which contains no members, loops back to itself, and is present
561  *    only when FSBR is on and there are no full-speed control or bulk QHs.
562  */
563 static int uhci_start(struct usb_hcd *hcd)
564 {
565         struct uhci_hcd *uhci = hcd_to_uhci(hcd);
566         int retval = -EBUSY;
567         int i;
568         struct dentry __maybe_unused *dentry;
569 
570         hcd->uses_new_polling = 1;
571         /* Accept arbitrarily long scatter-gather lists */
572         if (!(hcd->driver->flags & HCD_LOCAL_MEM))
573                 hcd->self.sg_tablesize = ~0;
574 
575         spin_lock_init(&uhci->lock);
576         setup_timer(&uhci->fsbr_timer, uhci_fsbr_timeout,
577                         (unsigned long) uhci);
578         INIT_LIST_HEAD(&uhci->idle_qh_list);
579         init_waitqueue_head(&uhci->waitqh);
580 
581 #ifdef UHCI_DEBUG_OPS
582         dentry = debugfs_create_file(hcd->self.bus_name,
583                         S_IFREG|S_IRUGO|S_IWUSR, uhci_debugfs_root,
584                         uhci, &uhci_debug_operations);
585         if (!dentry) {
586                 dev_err(uhci_dev(uhci), "couldn't create uhci debugfs entry\n");
587                 return -ENOMEM;
588         }
589         uhci->dentry = dentry;
590 #endif
591 
592         uhci->frame = dma_alloc_coherent(uhci_dev(uhci),
593                         UHCI_NUMFRAMES * sizeof(*uhci->frame),
594                         &uhci->frame_dma_handle, GFP_KERNEL);
595         if (!uhci->frame) {
596                 dev_err(uhci_dev(uhci),
597                         "unable to allocate consistent memory for frame list\n");
598                 goto err_alloc_frame;
599         }
600         memset(uhci->frame, 0, UHCI_NUMFRAMES * sizeof(*uhci->frame));
601 
602         uhci->frame_cpu = kcalloc(UHCI_NUMFRAMES, sizeof(*uhci->frame_cpu),
603                         GFP_KERNEL);
604         if (!uhci->frame_cpu) {
605                 dev_err(uhci_dev(uhci),
606                         "unable to allocate memory for frame pointers\n");
607                 goto err_alloc_frame_cpu;
608         }
609 
610         uhci->td_pool = dma_pool_create("uhci_td", uhci_dev(uhci),
611                         sizeof(struct uhci_td), 16, 0);
612         if (!uhci->td_pool) {
613                 dev_err(uhci_dev(uhci), "unable to create td dma_pool\n");
614                 goto err_create_td_pool;
615         }
616 
617         uhci->qh_pool = dma_pool_create("uhci_qh", uhci_dev(uhci),
618                         sizeof(struct uhci_qh), 16, 0);
619         if (!uhci->qh_pool) {
620                 dev_err(uhci_dev(uhci), "unable to create qh dma_pool\n");
621                 goto err_create_qh_pool;
622         }
623 
624         uhci->term_td = uhci_alloc_td(uhci);
625         if (!uhci->term_td) {
626                 dev_err(uhci_dev(uhci), "unable to allocate terminating TD\n");
627                 goto err_alloc_term_td;
628         }
629 
630         for (i = 0; i < UHCI_NUM_SKELQH; i++) {
631                 uhci->skelqh[i] = uhci_alloc_qh(uhci, NULL, NULL);
632                 if (!uhci->skelqh[i]) {
633                         dev_err(uhci_dev(uhci), "unable to allocate QH\n");
634                         goto err_alloc_skelqh;
635                 }
636         }
637 
638         /*
639          * 8 Interrupt queues; link all higher int queues to int1 = async
640          */
641         for (i = SKEL_ISO + 1; i < SKEL_ASYNC; ++i)
642                 uhci->skelqh[i]->link = LINK_TO_QH(uhci, uhci->skel_async_qh);
643         uhci->skel_async_qh->link = UHCI_PTR_TERM(uhci);
644         uhci->skel_term_qh->link = LINK_TO_QH(uhci, uhci->skel_term_qh);
645 
646         /* This dummy TD is to work around a bug in Intel PIIX controllers */
647         uhci_fill_td(uhci, uhci->term_td, 0, uhci_explen(0) |
648                         (0x7f << TD_TOKEN_DEVADDR_SHIFT) | USB_PID_IN, 0);
649         uhci->term_td->link = UHCI_PTR_TERM(uhci);
650         uhci->skel_async_qh->element = uhci->skel_term_qh->element =
651                 LINK_TO_TD(uhci, uhci->term_td);
652 
653         /*
654          * Fill the frame list: make all entries point to the proper
655          * interrupt queue.
656          */
657         for (i = 0; i < UHCI_NUMFRAMES; i++) {
658 
659                 /* Only place we don't use the frame list routines */
660                 uhci->frame[i] = uhci_frame_skel_link(uhci, i);
661         }
662 
663         /*
664          * Some architectures require a full mb() to enforce completion of
665          * the memory writes above before the I/O transfers in configure_hc().
666          */
667         mb();
668 
669         spin_lock_irq(&uhci->lock);
670         configure_hc(uhci);
671         uhci->is_initialized = 1;
672         start_rh(uhci);
673         spin_unlock_irq(&uhci->lock);
674         return 0;
675 
676 /*
677  * error exits:
678  */
679 err_alloc_skelqh:
680         for (i = 0; i < UHCI_NUM_SKELQH; i++) {
681                 if (uhci->skelqh[i])
682                         uhci_free_qh(uhci, uhci->skelqh[i]);
683         }
684 
685         uhci_free_td(uhci, uhci->term_td);
686 
687 err_alloc_term_td:
688         dma_pool_destroy(uhci->qh_pool);
689 
690 err_create_qh_pool:
691         dma_pool_destroy(uhci->td_pool);
692 
693 err_create_td_pool:
694         kfree(uhci->frame_cpu);
695 
696 err_alloc_frame_cpu:
697         dma_free_coherent(uhci_dev(uhci),
698                         UHCI_NUMFRAMES * sizeof(*uhci->frame),
699                         uhci->frame, uhci->frame_dma_handle);
700 
701 err_alloc_frame:
702         debugfs_remove(uhci->dentry);
703 
704         return retval;
705 }
706 
707 static void uhci_stop(struct usb_hcd *hcd)
708 {
709         struct uhci_hcd *uhci = hcd_to_uhci(hcd);
710 
711         spin_lock_irq(&uhci->lock);
712         if (HCD_HW_ACCESSIBLE(hcd) && !uhci->dead)
713                 uhci_hc_died(uhci);
714         uhci_scan_schedule(uhci);
715         spin_unlock_irq(&uhci->lock);
716         synchronize_irq(hcd->irq);
717 
718         del_timer_sync(&uhci->fsbr_timer);
719         release_uhci(uhci);
720 }
721 
722 #ifdef CONFIG_PM
723 static int uhci_rh_suspend(struct usb_hcd *hcd)
724 {
725         struct uhci_hcd *uhci = hcd_to_uhci(hcd);
726         int rc = 0;
727 
728         spin_lock_irq(&uhci->lock);
729         if (!HCD_HW_ACCESSIBLE(hcd))
730                 rc = -ESHUTDOWN;
731         else if (uhci->dead)
732                 ;               /* Dead controllers tell no tales */
733 
734         /* Once the controller is stopped, port resumes that are already
735          * in progress won't complete.  Hence if remote wakeup is enabled
736          * for the root hub and any ports are in the middle of a resume or
737          * remote wakeup, we must fail the suspend.
738          */
739         else if (hcd->self.root_hub->do_remote_wakeup &&
740                         uhci->resuming_ports) {
741                 dev_dbg(uhci_dev(uhci),
742                         "suspend failed because a port is resuming\n");
743                 rc = -EBUSY;
744         } else
745                 suspend_rh(uhci, UHCI_RH_SUSPENDED);
746         spin_unlock_irq(&uhci->lock);
747         return rc;
748 }
749 
750 static int uhci_rh_resume(struct usb_hcd *hcd)
751 {
752         struct uhci_hcd *uhci = hcd_to_uhci(hcd);
753         int rc = 0;
754 
755         spin_lock_irq(&uhci->lock);
756         if (!HCD_HW_ACCESSIBLE(hcd))
757                 rc = -ESHUTDOWN;
758         else if (!uhci->dead)
759                 wakeup_rh(uhci);
760         spin_unlock_irq(&uhci->lock);
761         return rc;
762 }
763 
764 #endif
765 
766 /* Wait until a particular device/endpoint's QH is idle, and free it */
767 static void uhci_hcd_endpoint_disable(struct usb_hcd *hcd,
768                 struct usb_host_endpoint *hep)
769 {
770         struct uhci_hcd *uhci = hcd_to_uhci(hcd);
771         struct uhci_qh *qh;
772 
773         spin_lock_irq(&uhci->lock);
774         qh = (struct uhci_qh *) hep->hcpriv;
775         if (qh == NULL)
776                 goto done;
777 
778         while (qh->state != QH_STATE_IDLE) {
779                 ++uhci->num_waiting;
780                 spin_unlock_irq(&uhci->lock);
781                 wait_event_interruptible(uhci->waitqh,
782                                 qh->state == QH_STATE_IDLE);
783                 spin_lock_irq(&uhci->lock);
784                 --uhci->num_waiting;
785         }
786 
787         uhci_free_qh(uhci, qh);
788 done:
789         spin_unlock_irq(&uhci->lock);
790 }
791 
792 static int uhci_hcd_get_frame_number(struct usb_hcd *hcd)
793 {
794         struct uhci_hcd *uhci = hcd_to_uhci(hcd);
795         unsigned frame_number;
796         unsigned delta;
797 
798         /* Minimize latency by avoiding the spinlock */
799         frame_number = uhci->frame_number;
800         barrier();
801         delta = (uhci_readw(uhci, USBFRNUM) - frame_number) &
802                         (UHCI_NUMFRAMES - 1);
803         return frame_number + delta;
804 }
805 
806 /* Determines number of ports on controller */
807 static int uhci_count_ports(struct usb_hcd *hcd)
808 {
809         struct uhci_hcd *uhci = hcd_to_uhci(hcd);
810         unsigned io_size = (unsigned) hcd->rsrc_len;
811         int port;
812 
813         /* The UHCI spec says devices must have 2 ports, and goes on to say
814          * they may have more but gives no way to determine how many there
815          * are.  However according to the UHCI spec, Bit 7 of the port
816          * status and control register is always set to 1.  So we try to
817          * use this to our advantage.  Another common failure mode when
818          * a nonexistent register is addressed is to return all ones, so
819          * we test for that also.
820          */
821         for (port = 0; port < (io_size - USBPORTSC1) / 2; port++) {
822                 unsigned int portstatus;
823 
824                 portstatus = uhci_readw(uhci, USBPORTSC1 + (port * 2));
825                 if (!(portstatus & 0x0080) || portstatus == 0xffff)
826                         break;
827         }
828         if (debug)
829                 dev_info(uhci_dev(uhci), "detected %d ports\n", port);
830 
831         /* Anything greater than 7 is weird so we'll ignore it. */
832         if (port > UHCI_RH_MAXCHILD) {
833                 dev_info(uhci_dev(uhci),
834                         "port count misdetected? forcing to 2 ports\n");
835                 port = 2;
836         }
837 
838         return port;
839 }
840 
841 static const char hcd_name[] = "uhci_hcd";
842 
843 #ifdef CONFIG_PCI
844 #include "uhci-pci.c"
845 #define PCI_DRIVER              uhci_pci_driver
846 #endif
847 
848 #ifdef CONFIG_SPARC_LEON
849 #include "uhci-grlib.c"
850 #define PLATFORM_DRIVER         uhci_grlib_driver
851 #endif
852 
853 #ifdef CONFIG_USB_UHCI_PLATFORM
854 #include "uhci-platform.c"
855 #define PLATFORM_DRIVER         uhci_platform_driver
856 #endif
857 
858 #if !defined(PCI_DRIVER) && !defined(PLATFORM_DRIVER)
859 #error "missing bus glue for uhci-hcd"
860 #endif
861 
862 static int __init uhci_hcd_init(void)
863 {
864         int retval = -ENOMEM;
865 
866         if (usb_disabled())
867                 return -ENODEV;
868 
869         printk(KERN_INFO "uhci_hcd: " DRIVER_DESC "%s\n",
870                         ignore_oc ? ", overcurrent ignored" : "");
871         set_bit(USB_UHCI_LOADED, &usb_hcds_loaded);
872 
873 #ifdef CONFIG_DYNAMIC_DEBUG
874         errbuf = kmalloc(ERRBUF_LEN, GFP_KERNEL);
875         if (!errbuf)
876                 goto errbuf_failed;
877         uhci_debugfs_root = debugfs_create_dir("uhci", usb_debug_root);
878         if (!uhci_debugfs_root)
879                 goto debug_failed;
880 #endif
881 
882         uhci_up_cachep = kmem_cache_create("uhci_urb_priv",
883                 sizeof(struct urb_priv), 0, 0, NULL);
884         if (!uhci_up_cachep)
885                 goto up_failed;
886 
887 #ifdef PLATFORM_DRIVER
888         retval = platform_driver_register(&PLATFORM_DRIVER);
889         if (retval < 0)
890                 goto clean0;
891 #endif
892 
893 #ifdef PCI_DRIVER
894         retval = pci_register_driver(&PCI_DRIVER);
895         if (retval < 0)
896                 goto clean1;
897 #endif
898 
899         return 0;
900 
901 #ifdef PCI_DRIVER
902 clean1:
903 #endif
904 #ifdef PLATFORM_DRIVER
905         platform_driver_unregister(&PLATFORM_DRIVER);
906 clean0:
907 #endif
908         kmem_cache_destroy(uhci_up_cachep);
909 
910 up_failed:
911 #if defined(DEBUG) || defined(CONFIG_DYNAMIC_DEBUG)
912         debugfs_remove(uhci_debugfs_root);
913 
914 debug_failed:
915         kfree(errbuf);
916 
917 errbuf_failed:
918 #endif
919 
920         clear_bit(USB_UHCI_LOADED, &usb_hcds_loaded);
921         return retval;
922 }
923 
924 static void __exit uhci_hcd_cleanup(void) 
925 {
926 #ifdef PLATFORM_DRIVER
927         platform_driver_unregister(&PLATFORM_DRIVER);
928 #endif
929 #ifdef PCI_DRIVER
930         pci_unregister_driver(&PCI_DRIVER);
931 #endif
932         kmem_cache_destroy(uhci_up_cachep);
933         debugfs_remove(uhci_debugfs_root);
934 #ifdef CONFIG_DYNAMIC_DEBUG
935         kfree(errbuf);
936 #endif
937         clear_bit(USB_UHCI_LOADED, &usb_hcds_loaded);
938 }
939 
940 module_init(uhci_hcd_init);
941 module_exit(uhci_hcd_cleanup);
942 
943 MODULE_AUTHOR(DRIVER_AUTHOR);
944 MODULE_DESCRIPTION(DRIVER_DESC);
945 MODULE_LICENSE("GPL");
946 

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