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/ehci-hcd.c

  1 /*
  2  * Enhanced Host Controller Interface (EHCI) driver for USB.
  3  *
  4  * Maintainer: Alan Stern <stern@rowland.harvard.edu>
  5  *
  6  * Copyright (c) 2000-2004 by David Brownell
  7  *
  8  * This program is free software; you can redistribute it and/or modify it
  9  * under the terms of the GNU General Public License as published by the
 10  * Free Software Foundation; either version 2 of the License, or (at your
 11  * option) any later version.
 12  *
 13  * This program is distributed in the hope that it will be useful, but
 14  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 15  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 16  * for more details.
 17  *
 18  * You should have received a copy of the GNU General Public License
 19  * along with this program; if not, write to the Free Software Foundation,
 20  * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 21  */
 22 
 23 #include <linux/module.h>
 24 #include <linux/pci.h>
 25 #include <linux/dmapool.h>
 26 #include <linux/kernel.h>
 27 #include <linux/delay.h>
 28 #include <linux/ioport.h>
 29 #include <linux/sched.h>
 30 #include <linux/vmalloc.h>
 31 #include <linux/errno.h>
 32 #include <linux/init.h>
 33 #include <linux/hrtimer.h>
 34 #include <linux/list.h>
 35 #include <linux/interrupt.h>
 36 #include <linux/usb.h>
 37 #include <linux/usb/hcd.h>
 38 #include <linux/moduleparam.h>
 39 #include <linux/dma-mapping.h>
 40 #include <linux/debugfs.h>
 41 #include <linux/slab.h>
 42 
 43 #include <asm/byteorder.h>
 44 #include <asm/io.h>
 45 #include <asm/irq.h>
 46 #include <asm/unaligned.h>
 47 
 48 #if defined(CONFIG_PPC_PS3)
 49 #include <asm/firmware.h>
 50 #endif
 51 
 52 /*-------------------------------------------------------------------------*/
 53 
 54 /*
 55  * EHCI hc_driver implementation ... experimental, incomplete.
 56  * Based on the final 1.0 register interface specification.
 57  *
 58  * USB 2.0 shows up in upcoming www.pcmcia.org technology.
 59  * First was PCMCIA, like ISA; then CardBus, which is PCI.
 60  * Next comes "CardBay", using USB 2.0 signals.
 61  *
 62  * Contains additional contributions by Brad Hards, Rory Bolt, and others.
 63  * Special thanks to Intel and VIA for providing host controllers to
 64  * test this driver on, and Cypress (including In-System Design) for
 65  * providing early devices for those host controllers to talk to!
 66  */
 67 
 68 #define DRIVER_AUTHOR "David Brownell"
 69 #define DRIVER_DESC "USB 2.0 'Enhanced' Host Controller (EHCI) Driver"
 70 
 71 static const char       hcd_name [] = "ehci_hcd";
 72 
 73 
 74 #undef EHCI_URB_TRACE
 75 
 76 /* magic numbers that can affect system performance */
 77 #define EHCI_TUNE_CERR          3       /* 0-3 qtd retries; 0 == don't stop */
 78 #define EHCI_TUNE_RL_HS         4       /* nak throttle; see 4.9 */
 79 #define EHCI_TUNE_RL_TT         0
 80 #define EHCI_TUNE_MULT_HS       1       /* 1-3 transactions/uframe; 4.10.3 */
 81 #define EHCI_TUNE_MULT_TT       1
 82 /*
 83  * Some drivers think it's safe to schedule isochronous transfers more than
 84  * 256 ms into the future (partly as a result of an old bug in the scheduling
 85  * code).  In an attempt to avoid trouble, we will use a minimum scheduling
 86  * length of 512 frames instead of 256.
 87  */
 88 #define EHCI_TUNE_FLS           1       /* (medium) 512-frame schedule */
 89 
 90 /* Initial IRQ latency:  faster than hw default */
 91 static int log2_irq_thresh = 0;         // 0 to 6
 92 module_param (log2_irq_thresh, int, S_IRUGO);
 93 MODULE_PARM_DESC (log2_irq_thresh, "log2 IRQ latency, 1-64 microframes");
 94 
 95 /* initial park setting:  slower than hw default */
 96 static unsigned park = 0;
 97 module_param (park, uint, S_IRUGO);
 98 MODULE_PARM_DESC (park, "park setting; 1-3 back-to-back async packets");
 99 
100 /* for flakey hardware, ignore overcurrent indicators */
101 static bool ignore_oc = 0;
102 module_param (ignore_oc, bool, S_IRUGO);
103 MODULE_PARM_DESC (ignore_oc, "ignore bogus hardware overcurrent indications");
104 
105 #define INTR_MASK (STS_IAA | STS_FATAL | STS_PCD | STS_ERR | STS_INT)
106 
107 /*-------------------------------------------------------------------------*/
108 
109 #include "ehci.h"
110 #include "pci-quirks.h"
111 
112 static void compute_tt_budget(u8 budget_table[EHCI_BANDWIDTH_SIZE],
113                 struct ehci_tt *tt);
114 
115 /*
116  * The MosChip MCS9990 controller updates its microframe counter
117  * a little before the frame counter, and occasionally we will read
118  * the invalid intermediate value.  Avoid problems by checking the
119  * microframe number (the low-order 3 bits); if they are 0 then
120  * re-read the register to get the correct value.
121  */
122 static unsigned ehci_moschip_read_frame_index(struct ehci_hcd *ehci)
123 {
124         unsigned uf;
125 
126         uf = ehci_readl(ehci, &ehci->regs->frame_index);
127         if (unlikely((uf & 7) == 0))
128                 uf = ehci_readl(ehci, &ehci->regs->frame_index);
129         return uf;
130 }
131 
132 static inline unsigned ehci_read_frame_index(struct ehci_hcd *ehci)
133 {
134         if (ehci->frame_index_bug)
135                 return ehci_moschip_read_frame_index(ehci);
136         return ehci_readl(ehci, &ehci->regs->frame_index);
137 }
138 
139 #include "ehci-dbg.c"
140 
141 /*-------------------------------------------------------------------------*/
142 
143 /*
144  * ehci_handshake - spin reading hc until handshake completes or fails
145  * @ptr: address of hc register to be read
146  * @mask: bits to look at in result of read
147  * @done: value of those bits when handshake succeeds
148  * @usec: timeout in microseconds
149  *
150  * Returns negative errno, or zero on success
151  *
152  * Success happens when the "mask" bits have the specified value (hardware
153  * handshake done).  There are two failure modes:  "usec" have passed (major
154  * hardware flakeout), or the register reads as all-ones (hardware removed).
155  *
156  * That last failure should_only happen in cases like physical cardbus eject
157  * before driver shutdown. But it also seems to be caused by bugs in cardbus
158  * bridge shutdown:  shutting down the bridge before the devices using it.
159  */
160 int ehci_handshake(struct ehci_hcd *ehci, void __iomem *ptr,
161                    u32 mask, u32 done, int usec)
162 {
163         u32     result;
164 
165         do {
166                 result = ehci_readl(ehci, ptr);
167                 if (result == ~(u32)0)          /* card removed */
168                         return -ENODEV;
169                 result &= mask;
170                 if (result == done)
171                         return 0;
172                 udelay (1);
173                 usec--;
174         } while (usec > 0);
175         return -ETIMEDOUT;
176 }
177 EXPORT_SYMBOL_GPL(ehci_handshake);
178 
179 /* check TDI/ARC silicon is in host mode */
180 static int tdi_in_host_mode (struct ehci_hcd *ehci)
181 {
182         u32             tmp;
183 
184         tmp = ehci_readl(ehci, &ehci->regs->usbmode);
185         return (tmp & 3) == USBMODE_CM_HC;
186 }
187 
188 /*
189  * Force HC to halt state from unknown (EHCI spec section 2.3).
190  * Must be called with interrupts enabled and the lock not held.
191  */
192 static int ehci_halt (struct ehci_hcd *ehci)
193 {
194         u32     temp;
195 
196         spin_lock_irq(&ehci->lock);
197 
198         /* disable any irqs left enabled by previous code */
199         ehci_writel(ehci, 0, &ehci->regs->intr_enable);
200 
201         if (ehci_is_TDI(ehci) && !tdi_in_host_mode(ehci)) {
202                 spin_unlock_irq(&ehci->lock);
203                 return 0;
204         }
205 
206         /*
207          * This routine gets called during probe before ehci->command
208          * has been initialized, so we can't rely on its value.
209          */
210         ehci->command &= ~CMD_RUN;
211         temp = ehci_readl(ehci, &ehci->regs->command);
212         temp &= ~(CMD_RUN | CMD_IAAD);
213         ehci_writel(ehci, temp, &ehci->regs->command);
214 
215         spin_unlock_irq(&ehci->lock);
216         synchronize_irq(ehci_to_hcd(ehci)->irq);
217 
218         return ehci_handshake(ehci, &ehci->regs->status,
219                           STS_HALT, STS_HALT, 16 * 125);
220 }
221 
222 /* put TDI/ARC silicon into EHCI mode */
223 static void tdi_reset (struct ehci_hcd *ehci)
224 {
225         u32             tmp;
226 
227         tmp = ehci_readl(ehci, &ehci->regs->usbmode);
228         tmp |= USBMODE_CM_HC;
229         /* The default byte access to MMR space is LE after
230          * controller reset. Set the required endian mode
231          * for transfer buffers to match the host microprocessor
232          */
233         if (ehci_big_endian_mmio(ehci))
234                 tmp |= USBMODE_BE;
235         ehci_writel(ehci, tmp, &ehci->regs->usbmode);
236 }
237 
238 /*
239  * Reset a non-running (STS_HALT == 1) controller.
240  * Must be called with interrupts enabled and the lock not held.
241  */
242 static int ehci_reset (struct ehci_hcd *ehci)
243 {
244         int     retval;
245         u32     command = ehci_readl(ehci, &ehci->regs->command);
246 
247         /* If the EHCI debug controller is active, special care must be
248          * taken before and after a host controller reset */
249         if (ehci->debug && !dbgp_reset_prep(ehci_to_hcd(ehci)))
250                 ehci->debug = NULL;
251 
252         command |= CMD_RESET;
253         dbg_cmd (ehci, "reset", command);
254         ehci_writel(ehci, command, &ehci->regs->command);
255         ehci->rh_state = EHCI_RH_HALTED;
256         ehci->next_statechange = jiffies;
257         retval = ehci_handshake(ehci, &ehci->regs->command,
258                             CMD_RESET, 0, 250 * 1000);
259 
260         if (ehci->has_hostpc) {
261                 ehci_writel(ehci, USBMODE_EX_HC | USBMODE_EX_VBPS,
262                                 &ehci->regs->usbmode_ex);
263                 ehci_writel(ehci, TXFIFO_DEFAULT, &ehci->regs->txfill_tuning);
264         }
265         if (retval)
266                 return retval;
267 
268         if (ehci_is_TDI(ehci))
269                 tdi_reset (ehci);
270 
271         if (ehci->debug)
272                 dbgp_external_startup(ehci_to_hcd(ehci));
273 
274         ehci->port_c_suspend = ehci->suspended_ports =
275                         ehci->resuming_ports = 0;
276         return retval;
277 }
278 
279 /*
280  * Idle the controller (turn off the schedules).
281  * Must be called with interrupts enabled and the lock not held.
282  */
283 static void ehci_quiesce (struct ehci_hcd *ehci)
284 {
285         u32     temp;
286 
287         if (ehci->rh_state != EHCI_RH_RUNNING)
288                 return;
289 
290         /* wait for any schedule enables/disables to take effect */
291         temp = (ehci->command << 10) & (STS_ASS | STS_PSS);
292         ehci_handshake(ehci, &ehci->regs->status, STS_ASS | STS_PSS, temp,
293                         16 * 125);
294 
295         /* then disable anything that's still active */
296         spin_lock_irq(&ehci->lock);
297         ehci->command &= ~(CMD_ASE | CMD_PSE);
298         ehci_writel(ehci, ehci->command, &ehci->regs->command);
299         spin_unlock_irq(&ehci->lock);
300 
301         /* hardware can take 16 microframes to turn off ... */
302         ehci_handshake(ehci, &ehci->regs->status, STS_ASS | STS_PSS, 0,
303                         16 * 125);
304 }
305 
306 /*-------------------------------------------------------------------------*/
307 
308 static void end_unlink_async(struct ehci_hcd *ehci);
309 static void unlink_empty_async(struct ehci_hcd *ehci);
310 static void unlink_empty_async_suspended(struct ehci_hcd *ehci);
311 static void ehci_work(struct ehci_hcd *ehci);
312 static void start_unlink_intr(struct ehci_hcd *ehci, struct ehci_qh *qh);
313 static void end_unlink_intr(struct ehci_hcd *ehci, struct ehci_qh *qh);
314 
315 #include "ehci-timer.c"
316 #include "ehci-hub.c"
317 #include "ehci-mem.c"
318 #include "ehci-q.c"
319 #include "ehci-sched.c"
320 #include "ehci-sysfs.c"
321 
322 /*-------------------------------------------------------------------------*/
323 
324 /* On some systems, leaving remote wakeup enabled prevents system shutdown.
325  * The firmware seems to think that powering off is a wakeup event!
326  * This routine turns off remote wakeup and everything else, on all ports.
327  */
328 static void ehci_turn_off_all_ports(struct ehci_hcd *ehci)
329 {
330         int     port = HCS_N_PORTS(ehci->hcs_params);
331 
332         while (port--)
333                 ehci_writel(ehci, PORT_RWC_BITS,
334                                 &ehci->regs->port_status[port]);
335 }
336 
337 /*
338  * Halt HC, turn off all ports, and let the BIOS use the companion controllers.
339  * Must be called with interrupts enabled and the lock not held.
340  */
341 static void ehci_silence_controller(struct ehci_hcd *ehci)
342 {
343         ehci_halt(ehci);
344 
345         spin_lock_irq(&ehci->lock);
346         ehci->rh_state = EHCI_RH_HALTED;
347         ehci_turn_off_all_ports(ehci);
348 
349         /* make BIOS/etc use companion controller during reboot */
350         ehci_writel(ehci, 0, &ehci->regs->configured_flag);
351 
352         /* unblock posted writes */
353         ehci_readl(ehci, &ehci->regs->configured_flag);
354         spin_unlock_irq(&ehci->lock);
355 }
356 
357 /* ehci_shutdown kick in for silicon on any bus (not just pci, etc).
358  * This forcibly disables dma and IRQs, helping kexec and other cases
359  * where the next system software may expect clean state.
360  */
361 static void ehci_shutdown(struct usb_hcd *hcd)
362 {
363         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
364 
365         spin_lock_irq(&ehci->lock);
366         ehci->shutdown = true;
367         ehci->rh_state = EHCI_RH_STOPPING;
368         ehci->enabled_hrtimer_events = 0;
369         spin_unlock_irq(&ehci->lock);
370 
371         ehci_silence_controller(ehci);
372 
373         hrtimer_cancel(&ehci->hrtimer);
374 }
375 
376 /*-------------------------------------------------------------------------*/
377 
378 /*
379  * ehci_work is called from some interrupts, timers, and so on.
380  * it calls driver completion functions, after dropping ehci->lock.
381  */
382 static void ehci_work (struct ehci_hcd *ehci)
383 {
384         /* another CPU may drop ehci->lock during a schedule scan while
385          * it reports urb completions.  this flag guards against bogus
386          * attempts at re-entrant schedule scanning.
387          */
388         if (ehci->scanning) {
389                 ehci->need_rescan = true;
390                 return;
391         }
392         ehci->scanning = true;
393 
394  rescan:
395         ehci->need_rescan = false;
396         if (ehci->async_count)
397                 scan_async(ehci);
398         if (ehci->intr_count > 0)
399                 scan_intr(ehci);
400         if (ehci->isoc_count > 0)
401                 scan_isoc(ehci);
402         if (ehci->need_rescan)
403                 goto rescan;
404         ehci->scanning = false;
405 
406         /* the IO watchdog guards against hardware or driver bugs that
407          * misplace IRQs, and should let us run completely without IRQs.
408          * such lossage has been observed on both VT6202 and VT8235.
409          */
410         turn_on_io_watchdog(ehci);
411 }
412 
413 /*
414  * Called when the ehci_hcd module is removed.
415  */
416 static void ehci_stop (struct usb_hcd *hcd)
417 {
418         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
419 
420         ehci_dbg (ehci, "stop\n");
421 
422         /* no more interrupts ... */
423 
424         spin_lock_irq(&ehci->lock);
425         ehci->enabled_hrtimer_events = 0;
426         spin_unlock_irq(&ehci->lock);
427 
428         ehci_quiesce(ehci);
429         ehci_silence_controller(ehci);
430         ehci_reset (ehci);
431 
432         hrtimer_cancel(&ehci->hrtimer);
433         remove_sysfs_files(ehci);
434         remove_debug_files (ehci);
435 
436         /* root hub is shut down separately (first, when possible) */
437         spin_lock_irq (&ehci->lock);
438         end_free_itds(ehci);
439         spin_unlock_irq (&ehci->lock);
440         ehci_mem_cleanup (ehci);
441 
442         if (ehci->amd_pll_fix == 1)
443                 usb_amd_dev_put();
444 
445         dbg_status (ehci, "ehci_stop completed",
446                     ehci_readl(ehci, &ehci->regs->status));
447 }
448 
449 /* one-time init, only for memory state */
450 static int ehci_init(struct usb_hcd *hcd)
451 {
452         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
453         u32                     temp;
454         int                     retval;
455         u32                     hcc_params;
456         struct ehci_qh_hw       *hw;
457 
458         spin_lock_init(&ehci->lock);
459 
460         /*
461          * keep io watchdog by default, those good HCDs could turn off it later
462          */
463         ehci->need_io_watchdog = 1;
464 
465         hrtimer_init(&ehci->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
466         ehci->hrtimer.function = ehci_hrtimer_func;
467         ehci->next_hrtimer_event = EHCI_HRTIMER_NO_EVENT;
468 
469         hcc_params = ehci_readl(ehci, &ehci->caps->hcc_params);
470 
471         /*
472          * by default set standard 80% (== 100 usec/uframe) max periodic
473          * bandwidth as required by USB 2.0
474          */
475         ehci->uframe_periodic_max = 100;
476 
477         /*
478          * hw default: 1K periodic list heads, one per frame.
479          * periodic_size can shrink by USBCMD update if hcc_params allows.
480          */
481         ehci->periodic_size = DEFAULT_I_TDPS;
482         INIT_LIST_HEAD(&ehci->async_unlink);
483         INIT_LIST_HEAD(&ehci->async_idle);
484         INIT_LIST_HEAD(&ehci->intr_unlink_wait);
485         INIT_LIST_HEAD(&ehci->intr_unlink);
486         INIT_LIST_HEAD(&ehci->intr_qh_list);
487         INIT_LIST_HEAD(&ehci->cached_itd_list);
488         INIT_LIST_HEAD(&ehci->cached_sitd_list);
489         INIT_LIST_HEAD(&ehci->tt_list);
490 
491         if (HCC_PGM_FRAMELISTLEN(hcc_params)) {
492                 /* periodic schedule size can be smaller than default */
493                 switch (EHCI_TUNE_FLS) {
494                 case 0: ehci->periodic_size = 1024; break;
495                 case 1: ehci->periodic_size = 512; break;
496                 case 2: ehci->periodic_size = 256; break;
497                 default:        BUG();
498                 }
499         }
500         if ((retval = ehci_mem_init(ehci, GFP_KERNEL)) < 0)
501                 return retval;
502 
503         /* controllers may cache some of the periodic schedule ... */
504         if (HCC_ISOC_CACHE(hcc_params))         // full frame cache
505                 ehci->i_thresh = 0;
506         else                                    // N microframes cached
507                 ehci->i_thresh = 2 + HCC_ISOC_THRES(hcc_params);
508 
509         /*
510          * dedicate a qh for the async ring head, since we couldn't unlink
511          * a 'real' qh without stopping the async schedule [4.8].  use it
512          * as the 'reclamation list head' too.
513          * its dummy is used in hw_alt_next of many tds, to prevent the qh
514          * from automatically advancing to the next td after short reads.
515          */
516         ehci->async->qh_next.qh = NULL;
517         hw = ehci->async->hw;
518         hw->hw_next = QH_NEXT(ehci, ehci->async->qh_dma);
519         hw->hw_info1 = cpu_to_hc32(ehci, QH_HEAD);
520 #if defined(CONFIG_PPC_PS3)
521         hw->hw_info1 |= cpu_to_hc32(ehci, QH_INACTIVATE);
522 #endif
523         hw->hw_token = cpu_to_hc32(ehci, QTD_STS_HALT);
524         hw->hw_qtd_next = EHCI_LIST_END(ehci);
525         ehci->async->qh_state = QH_STATE_LINKED;
526         hw->hw_alt_next = QTD_NEXT(ehci, ehci->async->dummy->qtd_dma);
527 
528         /* clear interrupt enables, set irq latency */
529         if (log2_irq_thresh < 0 || log2_irq_thresh > 6)
530                 log2_irq_thresh = 0;
531         temp = 1 << (16 + log2_irq_thresh);
532         if (HCC_PER_PORT_CHANGE_EVENT(hcc_params)) {
533                 ehci->has_ppcd = 1;
534                 ehci_dbg(ehci, "enable per-port change event\n");
535                 temp |= CMD_PPCEE;
536         }
537         if (HCC_CANPARK(hcc_params)) {
538                 /* HW default park == 3, on hardware that supports it (like
539                  * NVidia and ALI silicon), maximizes throughput on the async
540                  * schedule by avoiding QH fetches between transfers.
541                  *
542                  * With fast usb storage devices and NForce2, "park" seems to
543                  * make problems:  throughput reduction (!), data errors...
544                  */
545                 if (park) {
546                         park = min(park, (unsigned) 3);
547                         temp |= CMD_PARK;
548                         temp |= park << 8;
549                 }
550                 ehci_dbg(ehci, "park %d\n", park);
551         }
552         if (HCC_PGM_FRAMELISTLEN(hcc_params)) {
553                 /* periodic schedule size can be smaller than default */
554                 temp &= ~(3 << 2);
555                 temp |= (EHCI_TUNE_FLS << 2);
556         }
557         ehci->command = temp;
558 
559         /* Accept arbitrarily long scatter-gather lists */
560         if (!(hcd->driver->flags & HCD_LOCAL_MEM))
561                 hcd->self.sg_tablesize = ~0;
562         return 0;
563 }
564 
565 /* start HC running; it's halted, ehci_init() has been run (once) */
566 static int ehci_run (struct usb_hcd *hcd)
567 {
568         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
569         u32                     temp;
570         u32                     hcc_params;
571 
572         hcd->uses_new_polling = 1;
573 
574         /* EHCI spec section 4.1 */
575 
576         ehci_writel(ehci, ehci->periodic_dma, &ehci->regs->frame_list);
577         ehci_writel(ehci, (u32)ehci->async->qh_dma, &ehci->regs->async_next);
578 
579         /*
580          * hcc_params controls whether ehci->regs->segment must (!!!)
581          * be used; it constrains QH/ITD/SITD and QTD locations.
582          * pci_pool consistent memory always uses segment zero.
583          * streaming mappings for I/O buffers, like pci_map_single(),
584          * can return segments above 4GB, if the device allows.
585          *
586          * NOTE:  the dma mask is visible through dma_supported(), so
587          * drivers can pass this info along ... like NETIF_F_HIGHDMA,
588          * Scsi_Host.highmem_io, and so forth.  It's readonly to all
589          * host side drivers though.
590          */
591         hcc_params = ehci_readl(ehci, &ehci->caps->hcc_params);
592         if (HCC_64BIT_ADDR(hcc_params)) {
593                 ehci_writel(ehci, 0, &ehci->regs->segment);
594 #if 0
595 // this is deeply broken on almost all architectures
596                 if (!dma_set_mask(hcd->self.controller, DMA_BIT_MASK(64)))
597                         ehci_info(ehci, "enabled 64bit DMA\n");
598 #endif
599         }
600 
601 
602         // Philips, Intel, and maybe others need CMD_RUN before the
603         // root hub will detect new devices (why?); NEC doesn't
604         ehci->command &= ~(CMD_LRESET|CMD_IAAD|CMD_PSE|CMD_ASE|CMD_RESET);
605         ehci->command |= CMD_RUN;
606         ehci_writel(ehci, ehci->command, &ehci->regs->command);
607         dbg_cmd (ehci, "init", ehci->command);
608 
609         /*
610          * Start, enabling full USB 2.0 functionality ... usb 1.1 devices
611          * are explicitly handed to companion controller(s), so no TT is
612          * involved with the root hub.  (Except where one is integrated,
613          * and there's no companion controller unless maybe for USB OTG.)
614          *
615          * Turning on the CF flag will transfer ownership of all ports
616          * from the companions to the EHCI controller.  If any of the
617          * companions are in the middle of a port reset at the time, it
618          * could cause trouble.  Write-locking ehci_cf_port_reset_rwsem
619          * guarantees that no resets are in progress.  After we set CF,
620          * a short delay lets the hardware catch up; new resets shouldn't
621          * be started before the port switching actions could complete.
622          */
623         down_write(&ehci_cf_port_reset_rwsem);
624         ehci->rh_state = EHCI_RH_RUNNING;
625         ehci_writel(ehci, FLAG_CF, &ehci->regs->configured_flag);
626         ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
627         msleep(5);
628         up_write(&ehci_cf_port_reset_rwsem);
629         ehci->last_periodic_enable = ktime_get_real();
630 
631         temp = HC_VERSION(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase));
632         ehci_info (ehci,
633                 "USB %x.%x started, EHCI %x.%02x%s\n",
634                 ((ehci->sbrn & 0xf0)>>4), (ehci->sbrn & 0x0f),
635                 temp >> 8, temp & 0xff,
636                 ignore_oc ? ", overcurrent ignored" : "");
637 
638         ehci_writel(ehci, INTR_MASK,
639                     &ehci->regs->intr_enable); /* Turn On Interrupts */
640 
641         /* GRR this is run-once init(), being done every time the HC starts.
642          * So long as they're part of class devices, we can't do it init()
643          * since the class device isn't created that early.
644          */
645         create_debug_files(ehci);
646         create_sysfs_files(ehci);
647 
648         return 0;
649 }
650 
651 int ehci_setup(struct usb_hcd *hcd)
652 {
653         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
654         int retval;
655 
656         ehci->regs = (void __iomem *)ehci->caps +
657             HC_LENGTH(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase));
658         dbg_hcs_params(ehci, "reset");
659         dbg_hcc_params(ehci, "reset");
660 
661         /* cache this readonly data; minimize chip reads */
662         ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
663 
664         ehci->sbrn = HCD_USB2;
665 
666         /* data structure init */
667         retval = ehci_init(hcd);
668         if (retval)
669                 return retval;
670 
671         retval = ehci_halt(ehci);
672         if (retval)
673                 return retval;
674 
675         ehci_reset(ehci);
676 
677         return 0;
678 }
679 EXPORT_SYMBOL_GPL(ehci_setup);
680 
681 /*-------------------------------------------------------------------------*/
682 
683 static irqreturn_t ehci_irq (struct usb_hcd *hcd)
684 {
685         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
686         u32                     status, masked_status, pcd_status = 0, cmd;
687         int                     bh;
688         unsigned long           flags;
689 
690         /*
691          * For threadirqs option we use spin_lock_irqsave() variant to prevent
692          * deadlock with ehci hrtimer callback, because hrtimer callbacks run
693          * in interrupt context even when threadirqs is specified. We can go
694          * back to spin_lock() variant when hrtimer callbacks become threaded.
695          */
696         spin_lock_irqsave(&ehci->lock, flags);
697 
698         status = ehci_readl(ehci, &ehci->regs->status);
699 
700         /* e.g. cardbus physical eject */
701         if (status == ~(u32) 0) {
702                 ehci_dbg (ehci, "device removed\n");
703                 goto dead;
704         }
705 
706         /*
707          * We don't use STS_FLR, but some controllers don't like it to
708          * remain on, so mask it out along with the other status bits.
709          */
710         masked_status = status & (INTR_MASK | STS_FLR);
711 
712         /* Shared IRQ? */
713         if (!masked_status || unlikely(ehci->rh_state == EHCI_RH_HALTED)) {
714                 spin_unlock_irqrestore(&ehci->lock, flags);
715                 return IRQ_NONE;
716         }
717 
718         /* clear (just) interrupts */
719         ehci_writel(ehci, masked_status, &ehci->regs->status);
720         cmd = ehci_readl(ehci, &ehci->regs->command);
721         bh = 0;
722 
723         /* normal [4.15.1.2] or error [4.15.1.1] completion */
724         if (likely ((status & (STS_INT|STS_ERR)) != 0)) {
725                 if (likely ((status & STS_ERR) == 0))
726                         COUNT (ehci->stats.normal);
727                 else
728                         COUNT (ehci->stats.error);
729                 bh = 1;
730         }
731 
732         /* complete the unlinking of some qh [4.15.2.3] */
733         if (status & STS_IAA) {
734 
735                 /* Turn off the IAA watchdog */
736                 ehci->enabled_hrtimer_events &= ~BIT(EHCI_HRTIMER_IAA_WATCHDOG);
737 
738                 /*
739                  * Mild optimization: Allow another IAAD to reset the
740                  * hrtimer, if one occurs before the next expiration.
741                  * In theory we could always cancel the hrtimer, but
742                  * tests show that about half the time it will be reset
743                  * for some other event anyway.
744                  */
745                 if (ehci->next_hrtimer_event == EHCI_HRTIMER_IAA_WATCHDOG)
746                         ++ehci->next_hrtimer_event;
747 
748                 /* guard against (alleged) silicon errata */
749                 if (cmd & CMD_IAAD)
750                         ehci_dbg(ehci, "IAA with IAAD still set?\n");
751                 if (ehci->iaa_in_progress)
752                         COUNT(ehci->stats.iaa);
753                 end_unlink_async(ehci);
754         }
755 
756         /* remote wakeup [4.3.1] */
757         if (status & STS_PCD) {
758                 unsigned        i = HCS_N_PORTS (ehci->hcs_params);
759                 u32             ppcd = ~0;
760 
761                 /* kick root hub later */
762                 pcd_status = status;
763 
764                 /* resume root hub? */
765                 if (ehci->rh_state == EHCI_RH_SUSPENDED)
766                         usb_hcd_resume_root_hub(hcd);
767 
768                 /* get per-port change detect bits */
769                 if (ehci->has_ppcd)
770                         ppcd = status >> 16;
771 
772                 while (i--) {
773                         int pstatus;
774 
775                         /* leverage per-port change bits feature */
776                         if (!(ppcd & (1 << i)))
777                                 continue;
778                         pstatus = ehci_readl(ehci,
779                                          &ehci->regs->port_status[i]);
780 
781                         if (pstatus & PORT_OWNER)
782                                 continue;
783                         if (!(test_bit(i, &ehci->suspended_ports) &&
784                                         ((pstatus & PORT_RESUME) ||
785                                                 !(pstatus & PORT_SUSPEND)) &&
786                                         (pstatus & PORT_PE) &&
787                                         ehci->reset_done[i] == 0))
788                                 continue;
789 
790                         /* start 20 msec resume signaling from this port,
791                          * and make khubd collect PORT_STAT_C_SUSPEND to
792                          * stop that signaling.  Use 5 ms extra for safety,
793                          * like usb_port_resume() does.
794                          */
795                         ehci->reset_done[i] = jiffies + msecs_to_jiffies(25);
796                         set_bit(i, &ehci->resuming_ports);
797                         ehci_dbg (ehci, "port %d remote wakeup\n", i + 1);
798                         usb_hcd_start_port_resume(&hcd->self, i);
799                         mod_timer(&hcd->rh_timer, ehci->reset_done[i]);
800                 }
801         }
802 
803         /* PCI errors [4.15.2.4] */
804         if (unlikely ((status & STS_FATAL) != 0)) {
805                 ehci_err(ehci, "fatal error\n");
806                 dbg_cmd(ehci, "fatal", cmd);
807                 dbg_status(ehci, "fatal", status);
808 dead:
809                 usb_hc_died(hcd);
810 
811                 /* Don't let the controller do anything more */
812                 ehci->shutdown = true;
813                 ehci->rh_state = EHCI_RH_STOPPING;
814                 ehci->command &= ~(CMD_RUN | CMD_ASE | CMD_PSE);
815                 ehci_writel(ehci, ehci->command, &ehci->regs->command);
816                 ehci_writel(ehci, 0, &ehci->regs->intr_enable);
817                 ehci_handle_controller_death(ehci);
818 
819                 /* Handle completions when the controller stops */
820                 bh = 0;
821         }
822 
823         if (bh)
824                 ehci_work (ehci);
825         spin_unlock_irqrestore(&ehci->lock, flags);
826         if (pcd_status)
827                 usb_hcd_poll_rh_status(hcd);
828         return IRQ_HANDLED;
829 }
830 
831 /*-------------------------------------------------------------------------*/
832 
833 /*
834  * non-error returns are a promise to giveback() the urb later
835  * we drop ownership so next owner (or urb unlink) can get it
836  *
837  * urb + dev is in hcd.self.controller.urb_list
838  * we're queueing TDs onto software and hardware lists
839  *
840  * hcd-specific init for hcpriv hasn't been done yet
841  *
842  * NOTE:  control, bulk, and interrupt share the same code to append TDs
843  * to a (possibly active) QH, and the same QH scanning code.
844  */
845 static int ehci_urb_enqueue (
846         struct usb_hcd  *hcd,
847         struct urb      *urb,
848         gfp_t           mem_flags
849 ) {
850         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
851         struct list_head        qtd_list;
852 
853         INIT_LIST_HEAD (&qtd_list);
854 
855         switch (usb_pipetype (urb->pipe)) {
856         case PIPE_CONTROL:
857                 /* qh_completions() code doesn't handle all the fault cases
858                  * in multi-TD control transfers.  Even 1KB is rare anyway.
859                  */
860                 if (urb->transfer_buffer_length > (16 * 1024))
861                         return -EMSGSIZE;
862                 /* FALLTHROUGH */
863         /* case PIPE_BULK: */
864         default:
865                 if (!qh_urb_transaction (ehci, urb, &qtd_list, mem_flags))
866                         return -ENOMEM;
867                 return submit_async(ehci, urb, &qtd_list, mem_flags);
868 
869         case PIPE_INTERRUPT:
870                 if (!qh_urb_transaction (ehci, urb, &qtd_list, mem_flags))
871                         return -ENOMEM;
872                 return intr_submit(ehci, urb, &qtd_list, mem_flags);
873 
874         case PIPE_ISOCHRONOUS:
875                 if (urb->dev->speed == USB_SPEED_HIGH)
876                         return itd_submit (ehci, urb, mem_flags);
877                 else
878                         return sitd_submit (ehci, urb, mem_flags);
879         }
880 }
881 
882 /* remove from hardware lists
883  * completions normally happen asynchronously
884  */
885 
886 static int ehci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
887 {
888         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
889         struct ehci_qh          *qh;
890         unsigned long           flags;
891         int                     rc;
892 
893         spin_lock_irqsave (&ehci->lock, flags);
894         rc = usb_hcd_check_unlink_urb(hcd, urb, status);
895         if (rc)
896                 goto done;
897 
898         if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
899                 /*
900                  * We don't expedite dequeue for isochronous URBs.
901                  * Just wait until they complete normally or their
902                  * time slot expires.
903                  */
904         } else {
905                 qh = (struct ehci_qh *) urb->hcpriv;
906                 qh->exception = 1;
907                 switch (qh->qh_state) {
908                 case QH_STATE_LINKED:
909                         if (usb_pipetype(urb->pipe) == PIPE_INTERRUPT)
910                                 start_unlink_intr(ehci, qh);
911                         else
912                                 start_unlink_async(ehci, qh);
913                         break;
914                 case QH_STATE_COMPLETING:
915                         qh->dequeue_during_giveback = 1;
916                         break;
917                 case QH_STATE_UNLINK:
918                 case QH_STATE_UNLINK_WAIT:
919                         /* already started */
920                         break;
921                 case QH_STATE_IDLE:
922                         /* QH might be waiting for a Clear-TT-Buffer */
923                         qh_completions(ehci, qh);
924                         break;
925                 }
926         }
927 done:
928         spin_unlock_irqrestore (&ehci->lock, flags);
929         return rc;
930 }
931 
932 /*-------------------------------------------------------------------------*/
933 
934 // bulk qh holds the data toggle
935 
936 static void
937 ehci_endpoint_disable (struct usb_hcd *hcd, struct usb_host_endpoint *ep)
938 {
939         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
940         unsigned long           flags;
941         struct ehci_qh          *qh;
942 
943         /* ASSERT:  any requests/urbs are being unlinked */
944         /* ASSERT:  nobody can be submitting urbs for this any more */
945 
946 rescan:
947         spin_lock_irqsave (&ehci->lock, flags);
948         qh = ep->hcpriv;
949         if (!qh)
950                 goto done;
951 
952         /* endpoints can be iso streams.  for now, we don't
953          * accelerate iso completions ... so spin a while.
954          */
955         if (qh->hw == NULL) {
956                 struct ehci_iso_stream  *stream = ep->hcpriv;
957 
958                 if (!list_empty(&stream->td_list))
959                         goto idle_timeout;
960 
961                 /* BUG_ON(!list_empty(&stream->free_list)); */
962                 reserve_release_iso_bandwidth(ehci, stream, -1);
963                 kfree(stream);
964                 goto done;
965         }
966 
967         qh->exception = 1;
968         switch (qh->qh_state) {
969         case QH_STATE_LINKED:
970                 WARN_ON(!list_empty(&qh->qtd_list));
971                 if (usb_endpoint_type(&ep->desc) != USB_ENDPOINT_XFER_INT)
972                         start_unlink_async(ehci, qh);
973                 else
974                         start_unlink_intr(ehci, qh);
975                 /* FALL THROUGH */
976         case QH_STATE_COMPLETING:       /* already in unlinking */
977         case QH_STATE_UNLINK:           /* wait for hw to finish? */
978         case QH_STATE_UNLINK_WAIT:
979 idle_timeout:
980                 spin_unlock_irqrestore (&ehci->lock, flags);
981                 schedule_timeout_uninterruptible(1);
982                 goto rescan;
983         case QH_STATE_IDLE:             /* fully unlinked */
984                 if (qh->clearing_tt)
985                         goto idle_timeout;
986                 if (list_empty (&qh->qtd_list)) {
987                         if (qh->ps.bw_uperiod)
988                                 reserve_release_intr_bandwidth(ehci, qh, -1);
989                         qh_destroy(ehci, qh);
990                         break;
991                 }
992                 /* else FALL THROUGH */
993         default:
994                 /* caller was supposed to have unlinked any requests;
995                  * that's not our job.  just leak this memory.
996                  */
997                 ehci_err (ehci, "qh %p (#%02x) state %d%s\n",
998                         qh, ep->desc.bEndpointAddress, qh->qh_state,
999                         list_empty (&qh->qtd_list) ? "" : "(has tds)");
1000                 break;
1001         }
1002  done:
1003         ep->hcpriv = NULL;
1004         spin_unlock_irqrestore (&ehci->lock, flags);
1005 }
1006 
1007 static void
1008 ehci_endpoint_reset(struct usb_hcd *hcd, struct usb_host_endpoint *ep)
1009 {
1010         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
1011         struct ehci_qh          *qh;
1012         int                     eptype = usb_endpoint_type(&ep->desc);
1013         int                     epnum = usb_endpoint_num(&ep->desc);
1014         int                     is_out = usb_endpoint_dir_out(&ep->desc);
1015         unsigned long           flags;
1016 
1017         if (eptype != USB_ENDPOINT_XFER_BULK && eptype != USB_ENDPOINT_XFER_INT)
1018                 return;
1019 
1020         spin_lock_irqsave(&ehci->lock, flags);
1021         qh = ep->hcpriv;
1022 
1023         /* For Bulk and Interrupt endpoints we maintain the toggle state
1024          * in the hardware; the toggle bits in udev aren't used at all.
1025          * When an endpoint is reset by usb_clear_halt() we must reset
1026          * the toggle bit in the QH.
1027          */
1028         if (qh) {
1029                 if (!list_empty(&qh->qtd_list)) {
1030                         WARN_ONCE(1, "clear_halt for a busy endpoint\n");
1031                 } else {
1032                         /* The toggle value in the QH can't be updated
1033                          * while the QH is active.  Unlink it now;
1034                          * re-linking will call qh_refresh().
1035                          */
1036                         usb_settoggle(qh->ps.udev, epnum, is_out, 0);
1037                         qh->exception = 1;
1038                         if (eptype == USB_ENDPOINT_XFER_BULK)
1039                                 start_unlink_async(ehci, qh);
1040                         else
1041                                 start_unlink_intr(ehci, qh);
1042                 }
1043         }
1044         spin_unlock_irqrestore(&ehci->lock, flags);
1045 }
1046 
1047 static int ehci_get_frame (struct usb_hcd *hcd)
1048 {
1049         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
1050         return (ehci_read_frame_index(ehci) >> 3) % ehci->periodic_size;
1051 }
1052 
1053 /*-------------------------------------------------------------------------*/
1054 
1055 /* Device addition and removal */
1056 
1057 static void ehci_remove_device(struct usb_hcd *hcd, struct usb_device *udev)
1058 {
1059         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
1060 
1061         spin_lock_irq(&ehci->lock);
1062         drop_tt(udev);
1063         spin_unlock_irq(&ehci->lock);
1064 }
1065 
1066 /*-------------------------------------------------------------------------*/
1067 
1068 #ifdef  CONFIG_PM
1069 
1070 /* suspend/resume, section 4.3 */
1071 
1072 /* These routines handle the generic parts of controller suspend/resume */
1073 
1074 int ehci_suspend(struct usb_hcd *hcd, bool do_wakeup)
1075 {
1076         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
1077 
1078         if (time_before(jiffies, ehci->next_statechange))
1079                 msleep(10);
1080 
1081         /*
1082          * Root hub was already suspended.  Disable IRQ emission and
1083          * mark HW unaccessible.  The PM and USB cores make sure that
1084          * the root hub is either suspended or stopped.
1085          */
1086         ehci_prepare_ports_for_controller_suspend(ehci, do_wakeup);
1087 
1088         spin_lock_irq(&ehci->lock);
1089         ehci_writel(ehci, 0, &ehci->regs->intr_enable);
1090         (void) ehci_readl(ehci, &ehci->regs->intr_enable);
1091 
1092         clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
1093         spin_unlock_irq(&ehci->lock);
1094 
1095         synchronize_irq(hcd->irq);
1096 
1097         /* Check for race with a wakeup request */
1098         if (do_wakeup && HCD_WAKEUP_PENDING(hcd)) {
1099                 ehci_resume(hcd, false);
1100                 return -EBUSY;
1101         }
1102 
1103         return 0;
1104 }
1105 EXPORT_SYMBOL_GPL(ehci_suspend);
1106 
1107 /* Returns 0 if power was preserved, 1 if power was lost */
1108 int ehci_resume(struct usb_hcd *hcd, bool hibernated)
1109 {
1110         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
1111 
1112         if (time_before(jiffies, ehci->next_statechange))
1113                 msleep(100);
1114 
1115         /* Mark hardware accessible again as we are back to full power by now */
1116         set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
1117 
1118         if (ehci->shutdown)
1119                 return 0;               /* Controller is dead */
1120 
1121         /*
1122          * If CF is still set and we aren't resuming from hibernation
1123          * then we maintained suspend power.
1124          * Just undo the effect of ehci_suspend().
1125          */
1126         if (ehci_readl(ehci, &ehci->regs->configured_flag) == FLAG_CF &&
1127                         !hibernated) {
1128                 int     mask = INTR_MASK;
1129 
1130                 ehci_prepare_ports_for_controller_resume(ehci);
1131 
1132                 spin_lock_irq(&ehci->lock);
1133                 if (ehci->shutdown)
1134                         goto skip;
1135 
1136                 if (!hcd->self.root_hub->do_remote_wakeup)
1137                         mask &= ~STS_PCD;
1138                 ehci_writel(ehci, mask, &ehci->regs->intr_enable);
1139                 ehci_readl(ehci, &ehci->regs->intr_enable);
1140  skip:
1141                 spin_unlock_irq(&ehci->lock);
1142                 return 0;
1143         }
1144 
1145         /*
1146          * Else reset, to cope with power loss or resume from hibernation
1147          * having let the firmware kick in during reboot.
1148          */
1149         usb_root_hub_lost_power(hcd->self.root_hub);
1150         (void) ehci_halt(ehci);
1151         (void) ehci_reset(ehci);
1152 
1153         spin_lock_irq(&ehci->lock);
1154         if (ehci->shutdown)
1155                 goto skip;
1156 
1157         ehci_writel(ehci, ehci->command, &ehci->regs->command);
1158         ehci_writel(ehci, FLAG_CF, &ehci->regs->configured_flag);
1159         ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
1160 
1161         ehci->rh_state = EHCI_RH_SUSPENDED;
1162         spin_unlock_irq(&ehci->lock);
1163 
1164         return 1;
1165 }
1166 EXPORT_SYMBOL_GPL(ehci_resume);
1167 
1168 #endif
1169 
1170 /*-------------------------------------------------------------------------*/
1171 
1172 /*
1173  * Generic structure: This gets copied for platform drivers so that
1174  * individual entries can be overridden as needed.
1175  */
1176 
1177 static const struct hc_driver ehci_hc_driver = {
1178         .description =          hcd_name,
1179         .product_desc =         "EHCI Host Controller",
1180         .hcd_priv_size =        sizeof(struct ehci_hcd),
1181 
1182         /*
1183          * generic hardware linkage
1184          */
1185         .irq =                  ehci_irq,
1186         .flags =                HCD_MEMORY | HCD_USB2 | HCD_BH,
1187 
1188         /*
1189          * basic lifecycle operations
1190          */
1191         .reset =                ehci_setup,
1192         .start =                ehci_run,
1193         .stop =                 ehci_stop,
1194         .shutdown =             ehci_shutdown,
1195 
1196         /*
1197          * managing i/o requests and associated device resources
1198          */
1199         .urb_enqueue =          ehci_urb_enqueue,
1200         .urb_dequeue =          ehci_urb_dequeue,
1201         .endpoint_disable =     ehci_endpoint_disable,
1202         .endpoint_reset =       ehci_endpoint_reset,
1203         .clear_tt_buffer_complete =     ehci_clear_tt_buffer_complete,
1204 
1205         /*
1206          * scheduling support
1207          */
1208         .get_frame_number =     ehci_get_frame,
1209 
1210         /*
1211          * root hub support
1212          */
1213         .hub_status_data =      ehci_hub_status_data,
1214         .hub_control =          ehci_hub_control,
1215         .bus_suspend =          ehci_bus_suspend,
1216         .bus_resume =           ehci_bus_resume,
1217         .relinquish_port =      ehci_relinquish_port,
1218         .port_handed_over =     ehci_port_handed_over,
1219 
1220         /*
1221          * device support
1222          */
1223         .free_dev =             ehci_remove_device,
1224 };
1225 
1226 void ehci_init_driver(struct hc_driver *drv,
1227                 const struct ehci_driver_overrides *over)
1228 {
1229         /* Copy the generic table to drv and then apply the overrides */
1230         *drv = ehci_hc_driver;
1231 
1232         if (over) {
1233                 drv->hcd_priv_size += over->extra_priv_size;
1234                 if (over->reset)
1235                         drv->reset = over->reset;
1236         }
1237 }
1238 EXPORT_SYMBOL_GPL(ehci_init_driver);
1239 
1240 /*-------------------------------------------------------------------------*/
1241 
1242 MODULE_DESCRIPTION(DRIVER_DESC);
1243 MODULE_AUTHOR (DRIVER_AUTHOR);
1244 MODULE_LICENSE ("GPL");
1245 
1246 #ifdef CONFIG_USB_EHCI_FSL
1247 #include "ehci-fsl.c"
1248 #define PLATFORM_DRIVER         ehci_fsl_driver
1249 #endif
1250 
1251 #ifdef CONFIG_USB_EHCI_SH
1252 #include "ehci-sh.c"
1253 #define PLATFORM_DRIVER         ehci_hcd_sh_driver
1254 #endif
1255 
1256 #ifdef CONFIG_PPC_PS3
1257 #include "ehci-ps3.c"
1258 #define PS3_SYSTEM_BUS_DRIVER   ps3_ehci_driver
1259 #endif
1260 
1261 #ifdef CONFIG_USB_EHCI_HCD_PPC_OF
1262 #include "ehci-ppc-of.c"
1263 #define OF_PLATFORM_DRIVER      ehci_hcd_ppc_of_driver
1264 #endif
1265 
1266 #ifdef CONFIG_XPS_USB_HCD_XILINX
1267 #include "ehci-xilinx-of.c"
1268 #define XILINX_OF_PLATFORM_DRIVER       ehci_hcd_xilinx_of_driver
1269 #endif
1270 
1271 #ifdef CONFIG_USB_OCTEON_EHCI
1272 #include "ehci-octeon.c"
1273 #define PLATFORM_DRIVER         ehci_octeon_driver
1274 #endif
1275 
1276 #ifdef CONFIG_TILE_USB
1277 #include "ehci-tilegx.c"
1278 #define PLATFORM_DRIVER         ehci_hcd_tilegx_driver
1279 #endif
1280 
1281 #ifdef CONFIG_USB_EHCI_HCD_PMC_MSP
1282 #include "ehci-pmcmsp.c"
1283 #define PLATFORM_DRIVER         ehci_hcd_msp_driver
1284 #endif
1285 
1286 #ifdef CONFIG_SPARC_LEON
1287 #include "ehci-grlib.c"
1288 #define PLATFORM_DRIVER         ehci_grlib_driver
1289 #endif
1290 
1291 #ifdef CONFIG_USB_EHCI_MV
1292 #include "ehci-mv.c"
1293 #define        PLATFORM_DRIVER         ehci_mv_driver
1294 #endif
1295 
1296 #ifdef CONFIG_MIPS_SEAD3
1297 #include "ehci-sead3.c"
1298 #define PLATFORM_DRIVER         ehci_hcd_sead3_driver
1299 #endif
1300 
1301 static int __init ehci_hcd_init(void)
1302 {
1303         int retval = 0;
1304 
1305         if (usb_disabled())
1306                 return -ENODEV;
1307 
1308         printk(KERN_INFO "%s: " DRIVER_DESC "\n", hcd_name);
1309         set_bit(USB_EHCI_LOADED, &usb_hcds_loaded);
1310         if (test_bit(USB_UHCI_LOADED, &usb_hcds_loaded) ||
1311                         test_bit(USB_OHCI_LOADED, &usb_hcds_loaded))
1312                 printk(KERN_WARNING "Warning! ehci_hcd should always be loaded"
1313                                 " before uhci_hcd and ohci_hcd, not after\n");
1314 
1315         pr_debug("%s: block sizes: qh %Zd qtd %Zd itd %Zd sitd %Zd\n",
1316                  hcd_name,
1317                  sizeof(struct ehci_qh), sizeof(struct ehci_qtd),
1318                  sizeof(struct ehci_itd), sizeof(struct ehci_sitd));
1319 
1320 #ifdef CONFIG_DYNAMIC_DEBUG
1321         ehci_debug_root = debugfs_create_dir("ehci", usb_debug_root);
1322         if (!ehci_debug_root) {
1323                 retval = -ENOENT;
1324                 goto err_debug;
1325         }
1326 #endif
1327 
1328 #ifdef PLATFORM_DRIVER
1329         retval = platform_driver_register(&PLATFORM_DRIVER);
1330         if (retval < 0)
1331                 goto clean0;
1332 #endif
1333 
1334 #ifdef PS3_SYSTEM_BUS_DRIVER
1335         retval = ps3_ehci_driver_register(&PS3_SYSTEM_BUS_DRIVER);
1336         if (retval < 0)
1337                 goto clean2;
1338 #endif
1339 
1340 #ifdef OF_PLATFORM_DRIVER
1341         retval = platform_driver_register(&OF_PLATFORM_DRIVER);
1342         if (retval < 0)
1343                 goto clean3;
1344 #endif
1345 
1346 #ifdef XILINX_OF_PLATFORM_DRIVER
1347         retval = platform_driver_register(&XILINX_OF_PLATFORM_DRIVER);
1348         if (retval < 0)
1349                 goto clean4;
1350 #endif
1351         return retval;
1352 
1353 #ifdef XILINX_OF_PLATFORM_DRIVER
1354         /* platform_driver_unregister(&XILINX_OF_PLATFORM_DRIVER); */
1355 clean4:
1356 #endif
1357 #ifdef OF_PLATFORM_DRIVER
1358         platform_driver_unregister(&OF_PLATFORM_DRIVER);
1359 clean3:
1360 #endif
1361 #ifdef PS3_SYSTEM_BUS_DRIVER
1362         ps3_ehci_driver_unregister(&PS3_SYSTEM_BUS_DRIVER);
1363 clean2:
1364 #endif
1365 #ifdef PLATFORM_DRIVER
1366         platform_driver_unregister(&PLATFORM_DRIVER);
1367 clean0:
1368 #endif
1369 #ifdef CONFIG_DYNAMIC_DEBUG
1370         debugfs_remove(ehci_debug_root);
1371         ehci_debug_root = NULL;
1372 err_debug:
1373 #endif
1374         clear_bit(USB_EHCI_LOADED, &usb_hcds_loaded);
1375         return retval;
1376 }
1377 module_init(ehci_hcd_init);
1378 
1379 static void __exit ehci_hcd_cleanup(void)
1380 {
1381 #ifdef XILINX_OF_PLATFORM_DRIVER
1382         platform_driver_unregister(&XILINX_OF_PLATFORM_DRIVER);
1383 #endif
1384 #ifdef OF_PLATFORM_DRIVER
1385         platform_driver_unregister(&OF_PLATFORM_DRIVER);
1386 #endif
1387 #ifdef PLATFORM_DRIVER
1388         platform_driver_unregister(&PLATFORM_DRIVER);
1389 #endif
1390 #ifdef PS3_SYSTEM_BUS_DRIVER
1391         ps3_ehci_driver_unregister(&PS3_SYSTEM_BUS_DRIVER);
1392 #endif
1393 #ifdef CONFIG_DYNAMIC_DEBUG
1394         debugfs_remove(ehci_debug_root);
1395 #endif
1396         clear_bit(USB_EHCI_LOADED, &usb_hcds_loaded);
1397 }
1398 module_exit(ehci_hcd_cleanup);
1399 

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