Version:  2.0.40 2.2.26 2.4.37 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6

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;
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 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 EXPORT_SYMBOL_GPL(ehci_reset);
279 
280 /*
281  * Idle the controller (turn off the schedules).
282  * Must be called with interrupts enabled and the lock not held.
283  */
284 static void ehci_quiesce (struct ehci_hcd *ehci)
285 {
286         u32     temp;
287 
288         if (ehci->rh_state != EHCI_RH_RUNNING)
289                 return;
290 
291         /* wait for any schedule enables/disables to take effect */
292         temp = (ehci->command << 10) & (STS_ASS | STS_PSS);
293         ehci_handshake(ehci, &ehci->regs->status, STS_ASS | STS_PSS, temp,
294                         16 * 125);
295 
296         /* then disable anything that's still active */
297         spin_lock_irq(&ehci->lock);
298         ehci->command &= ~(CMD_ASE | CMD_PSE);
299         ehci_writel(ehci, ehci->command, &ehci->regs->command);
300         spin_unlock_irq(&ehci->lock);
301 
302         /* hardware can take 16 microframes to turn off ... */
303         ehci_handshake(ehci, &ehci->regs->status, STS_ASS | STS_PSS, 0,
304                         16 * 125);
305 }
306 
307 /*-------------------------------------------------------------------------*/
308 
309 static void end_iaa_cycle(struct ehci_hcd *ehci);
310 static void end_unlink_async(struct ehci_hcd *ehci);
311 static void unlink_empty_async(struct ehci_hcd *ehci);
312 static void ehci_work(struct ehci_hcd *ehci);
313 static void start_unlink_intr(struct ehci_hcd *ehci, struct ehci_qh *qh);
314 static void end_unlink_intr(struct ehci_hcd *ehci, struct ehci_qh *qh);
315 static int ehci_port_power(struct ehci_hcd *ehci, int portnum, bool enable);
316 
317 #include "ehci-timer.c"
318 #include "ehci-hub.c"
319 #include "ehci-mem.c"
320 #include "ehci-q.c"
321 #include "ehci-sched.c"
322 #include "ehci-sysfs.c"
323 
324 /*-------------------------------------------------------------------------*/
325 
326 /* On some systems, leaving remote wakeup enabled prevents system shutdown.
327  * The firmware seems to think that powering off is a wakeup event!
328  * This routine turns off remote wakeup and everything else, on all ports.
329  */
330 static void ehci_turn_off_all_ports(struct ehci_hcd *ehci)
331 {
332         int     port = HCS_N_PORTS(ehci->hcs_params);
333 
334         while (port--) {
335                 ehci_writel(ehci, PORT_RWC_BITS,
336                                 &ehci->regs->port_status[port]);
337                 spin_unlock_irq(&ehci->lock);
338                 ehci_port_power(ehci, port, false);
339                 spin_lock_irq(&ehci->lock);
340         }
341 }
342 
343 /*
344  * Halt HC, turn off all ports, and let the BIOS use the companion controllers.
345  * Must be called with interrupts enabled and the lock not held.
346  */
347 static void ehci_silence_controller(struct ehci_hcd *ehci)
348 {
349         ehci_halt(ehci);
350 
351         spin_lock_irq(&ehci->lock);
352         ehci->rh_state = EHCI_RH_HALTED;
353         ehci_turn_off_all_ports(ehci);
354 
355         /* make BIOS/etc use companion controller during reboot */
356         ehci_writel(ehci, 0, &ehci->regs->configured_flag);
357 
358         /* unblock posted writes */
359         ehci_readl(ehci, &ehci->regs->configured_flag);
360         spin_unlock_irq(&ehci->lock);
361 }
362 
363 /* ehci_shutdown kick in for silicon on any bus (not just pci, etc).
364  * This forcibly disables dma and IRQs, helping kexec and other cases
365  * where the next system software may expect clean state.
366  */
367 static void ehci_shutdown(struct usb_hcd *hcd)
368 {
369         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
370 
371         spin_lock_irq(&ehci->lock);
372         ehci->shutdown = true;
373         ehci->rh_state = EHCI_RH_STOPPING;
374         ehci->enabled_hrtimer_events = 0;
375         spin_unlock_irq(&ehci->lock);
376 
377         ehci_silence_controller(ehci);
378 
379         hrtimer_cancel(&ehci->hrtimer);
380 }
381 
382 /*-------------------------------------------------------------------------*/
383 
384 /*
385  * ehci_work is called from some interrupts, timers, and so on.
386  * it calls driver completion functions, after dropping ehci->lock.
387  */
388 static void ehci_work (struct ehci_hcd *ehci)
389 {
390         /* another CPU may drop ehci->lock during a schedule scan while
391          * it reports urb completions.  this flag guards against bogus
392          * attempts at re-entrant schedule scanning.
393          */
394         if (ehci->scanning) {
395                 ehci->need_rescan = true;
396                 return;
397         }
398         ehci->scanning = true;
399 
400  rescan:
401         ehci->need_rescan = false;
402         if (ehci->async_count)
403                 scan_async(ehci);
404         if (ehci->intr_count > 0)
405                 scan_intr(ehci);
406         if (ehci->isoc_count > 0)
407                 scan_isoc(ehci);
408         if (ehci->need_rescan)
409                 goto rescan;
410         ehci->scanning = false;
411 
412         /* the IO watchdog guards against hardware or driver bugs that
413          * misplace IRQs, and should let us run completely without IRQs.
414          * such lossage has been observed on both VT6202 and VT8235.
415          */
416         turn_on_io_watchdog(ehci);
417 }
418 
419 /*
420  * Called when the ehci_hcd module is removed.
421  */
422 static void ehci_stop (struct usb_hcd *hcd)
423 {
424         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
425 
426         ehci_dbg (ehci, "stop\n");
427 
428         /* no more interrupts ... */
429 
430         spin_lock_irq(&ehci->lock);
431         ehci->enabled_hrtimer_events = 0;
432         spin_unlock_irq(&ehci->lock);
433 
434         ehci_quiesce(ehci);
435         ehci_silence_controller(ehci);
436         ehci_reset (ehci);
437 
438         hrtimer_cancel(&ehci->hrtimer);
439         remove_sysfs_files(ehci);
440         remove_debug_files (ehci);
441 
442         /* root hub is shut down separately (first, when possible) */
443         spin_lock_irq (&ehci->lock);
444         end_free_itds(ehci);
445         spin_unlock_irq (&ehci->lock);
446         ehci_mem_cleanup (ehci);
447 
448         if (ehci->amd_pll_fix == 1)
449                 usb_amd_dev_put();
450 
451         dbg_status (ehci, "ehci_stop completed",
452                     ehci_readl(ehci, &ehci->regs->status));
453 }
454 
455 /* one-time init, only for memory state */
456 static int ehci_init(struct usb_hcd *hcd)
457 {
458         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
459         u32                     temp;
460         int                     retval;
461         u32                     hcc_params;
462         struct ehci_qh_hw       *hw;
463 
464         spin_lock_init(&ehci->lock);
465 
466         /*
467          * keep io watchdog by default, those good HCDs could turn off it later
468          */
469         ehci->need_io_watchdog = 1;
470 
471         hrtimer_init(&ehci->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
472         ehci->hrtimer.function = ehci_hrtimer_func;
473         ehci->next_hrtimer_event = EHCI_HRTIMER_NO_EVENT;
474 
475         hcc_params = ehci_readl(ehci, &ehci->caps->hcc_params);
476 
477         /*
478          * by default set standard 80% (== 100 usec/uframe) max periodic
479          * bandwidth as required by USB 2.0
480          */
481         ehci->uframe_periodic_max = 100;
482 
483         /*
484          * hw default: 1K periodic list heads, one per frame.
485          * periodic_size can shrink by USBCMD update if hcc_params allows.
486          */
487         ehci->periodic_size = DEFAULT_I_TDPS;
488         INIT_LIST_HEAD(&ehci->async_unlink);
489         INIT_LIST_HEAD(&ehci->async_idle);
490         INIT_LIST_HEAD(&ehci->intr_unlink_wait);
491         INIT_LIST_HEAD(&ehci->intr_unlink);
492         INIT_LIST_HEAD(&ehci->intr_qh_list);
493         INIT_LIST_HEAD(&ehci->cached_itd_list);
494         INIT_LIST_HEAD(&ehci->cached_sitd_list);
495         INIT_LIST_HEAD(&ehci->tt_list);
496 
497         if (HCC_PGM_FRAMELISTLEN(hcc_params)) {
498                 /* periodic schedule size can be smaller than default */
499                 switch (EHCI_TUNE_FLS) {
500                 case 0: ehci->periodic_size = 1024; break;
501                 case 1: ehci->periodic_size = 512; break;
502                 case 2: ehci->periodic_size = 256; break;
503                 default:        BUG();
504                 }
505         }
506         if ((retval = ehci_mem_init(ehci, GFP_KERNEL)) < 0)
507                 return retval;
508 
509         /* controllers may cache some of the periodic schedule ... */
510         if (HCC_ISOC_CACHE(hcc_params))         // full frame cache
511                 ehci->i_thresh = 0;
512         else                                    // N microframes cached
513                 ehci->i_thresh = 2 + HCC_ISOC_THRES(hcc_params);
514 
515         /*
516          * dedicate a qh for the async ring head, since we couldn't unlink
517          * a 'real' qh without stopping the async schedule [4.8].  use it
518          * as the 'reclamation list head' too.
519          * its dummy is used in hw_alt_next of many tds, to prevent the qh
520          * from automatically advancing to the next td after short reads.
521          */
522         ehci->async->qh_next.qh = NULL;
523         hw = ehci->async->hw;
524         hw->hw_next = QH_NEXT(ehci, ehci->async->qh_dma);
525         hw->hw_info1 = cpu_to_hc32(ehci, QH_HEAD);
526 #if defined(CONFIG_PPC_PS3)
527         hw->hw_info1 |= cpu_to_hc32(ehci, QH_INACTIVATE);
528 #endif
529         hw->hw_token = cpu_to_hc32(ehci, QTD_STS_HALT);
530         hw->hw_qtd_next = EHCI_LIST_END(ehci);
531         ehci->async->qh_state = QH_STATE_LINKED;
532         hw->hw_alt_next = QTD_NEXT(ehci, ehci->async->dummy->qtd_dma);
533 
534         /* clear interrupt enables, set irq latency */
535         if (log2_irq_thresh < 0 || log2_irq_thresh > 6)
536                 log2_irq_thresh = 0;
537         temp = 1 << (16 + log2_irq_thresh);
538         if (HCC_PER_PORT_CHANGE_EVENT(hcc_params)) {
539                 ehci->has_ppcd = 1;
540                 ehci_dbg(ehci, "enable per-port change event\n");
541                 temp |= CMD_PPCEE;
542         }
543         if (HCC_CANPARK(hcc_params)) {
544                 /* HW default park == 3, on hardware that supports it (like
545                  * NVidia and ALI silicon), maximizes throughput on the async
546                  * schedule by avoiding QH fetches between transfers.
547                  *
548                  * With fast usb storage devices and NForce2, "park" seems to
549                  * make problems:  throughput reduction (!), data errors...
550                  */
551                 if (park) {
552                         park = min(park, (unsigned) 3);
553                         temp |= CMD_PARK;
554                         temp |= park << 8;
555                 }
556                 ehci_dbg(ehci, "park %d\n", park);
557         }
558         if (HCC_PGM_FRAMELISTLEN(hcc_params)) {
559                 /* periodic schedule size can be smaller than default */
560                 temp &= ~(3 << 2);
561                 temp |= (EHCI_TUNE_FLS << 2);
562         }
563         ehci->command = temp;
564 
565         /* Accept arbitrarily long scatter-gather lists */
566         if (!(hcd->driver->flags & HCD_LOCAL_MEM))
567                 hcd->self.sg_tablesize = ~0;
568 
569         /* Prepare for unlinking active QHs */
570         ehci->old_current = ~0;
571         return 0;
572 }
573 
574 /* start HC running; it's halted, ehci_init() has been run (once) */
575 static int ehci_run (struct usb_hcd *hcd)
576 {
577         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
578         u32                     temp;
579         u32                     hcc_params;
580 
581         hcd->uses_new_polling = 1;
582 
583         /* EHCI spec section 4.1 */
584 
585         ehci_writel(ehci, ehci->periodic_dma, &ehci->regs->frame_list);
586         ehci_writel(ehci, (u32)ehci->async->qh_dma, &ehci->regs->async_next);
587 
588         /*
589          * hcc_params controls whether ehci->regs->segment must (!!!)
590          * be used; it constrains QH/ITD/SITD and QTD locations.
591          * pci_pool consistent memory always uses segment zero.
592          * streaming mappings for I/O buffers, like pci_map_single(),
593          * can return segments above 4GB, if the device allows.
594          *
595          * NOTE:  the dma mask is visible through dev->dma_mask, so
596          * drivers can pass this info along ... like NETIF_F_HIGHDMA,
597          * Scsi_Host.highmem_io, and so forth.  It's readonly to all
598          * host side drivers though.
599          */
600         hcc_params = ehci_readl(ehci, &ehci->caps->hcc_params);
601         if (HCC_64BIT_ADDR(hcc_params)) {
602                 ehci_writel(ehci, 0, &ehci->regs->segment);
603 #if 0
604 // this is deeply broken on almost all architectures
605                 if (!dma_set_mask(hcd->self.controller, DMA_BIT_MASK(64)))
606                         ehci_info(ehci, "enabled 64bit DMA\n");
607 #endif
608         }
609 
610 
611         // Philips, Intel, and maybe others need CMD_RUN before the
612         // root hub will detect new devices (why?); NEC doesn't
613         ehci->command &= ~(CMD_LRESET|CMD_IAAD|CMD_PSE|CMD_ASE|CMD_RESET);
614         ehci->command |= CMD_RUN;
615         ehci_writel(ehci, ehci->command, &ehci->regs->command);
616         dbg_cmd (ehci, "init", ehci->command);
617 
618         /*
619          * Start, enabling full USB 2.0 functionality ... usb 1.1 devices
620          * are explicitly handed to companion controller(s), so no TT is
621          * involved with the root hub.  (Except where one is integrated,
622          * and there's no companion controller unless maybe for USB OTG.)
623          *
624          * Turning on the CF flag will transfer ownership of all ports
625          * from the companions to the EHCI controller.  If any of the
626          * companions are in the middle of a port reset at the time, it
627          * could cause trouble.  Write-locking ehci_cf_port_reset_rwsem
628          * guarantees that no resets are in progress.  After we set CF,
629          * a short delay lets the hardware catch up; new resets shouldn't
630          * be started before the port switching actions could complete.
631          */
632         down_write(&ehci_cf_port_reset_rwsem);
633         ehci->rh_state = EHCI_RH_RUNNING;
634         ehci_writel(ehci, FLAG_CF, &ehci->regs->configured_flag);
635         ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
636         msleep(5);
637         up_write(&ehci_cf_port_reset_rwsem);
638         ehci->last_periodic_enable = ktime_get_real();
639 
640         temp = HC_VERSION(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase));
641         ehci_info (ehci,
642                 "USB %x.%x started, EHCI %x.%02x%s\n",
643                 ((ehci->sbrn & 0xf0)>>4), (ehci->sbrn & 0x0f),
644                 temp >> 8, temp & 0xff,
645                 ignore_oc ? ", overcurrent ignored" : "");
646 
647         ehci_writel(ehci, INTR_MASK,
648                     &ehci->regs->intr_enable); /* Turn On Interrupts */
649 
650         /* GRR this is run-once init(), being done every time the HC starts.
651          * So long as they're part of class devices, we can't do it init()
652          * since the class device isn't created that early.
653          */
654         create_debug_files(ehci);
655         create_sysfs_files(ehci);
656 
657         return 0;
658 }
659 
660 int ehci_setup(struct usb_hcd *hcd)
661 {
662         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
663         int retval;
664 
665         ehci->regs = (void __iomem *)ehci->caps +
666             HC_LENGTH(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase));
667         dbg_hcs_params(ehci, "reset");
668         dbg_hcc_params(ehci, "reset");
669 
670         /* cache this readonly data; minimize chip reads */
671         ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
672 
673         ehci->sbrn = HCD_USB2;
674 
675         /* data structure init */
676         retval = ehci_init(hcd);
677         if (retval)
678                 return retval;
679 
680         retval = ehci_halt(ehci);
681         if (retval) {
682                 ehci_mem_cleanup(ehci);
683                 return retval;
684         }
685 
686         ehci_reset(ehci);
687 
688         return 0;
689 }
690 EXPORT_SYMBOL_GPL(ehci_setup);
691 
692 /*-------------------------------------------------------------------------*/
693 
694 static irqreturn_t ehci_irq (struct usb_hcd *hcd)
695 {
696         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
697         u32                     status, masked_status, pcd_status = 0, cmd;
698         int                     bh;
699         unsigned long           flags;
700 
701         /*
702          * For threadirqs option we use spin_lock_irqsave() variant to prevent
703          * deadlock with ehci hrtimer callback, because hrtimer callbacks run
704          * in interrupt context even when threadirqs is specified. We can go
705          * back to spin_lock() variant when hrtimer callbacks become threaded.
706          */
707         spin_lock_irqsave(&ehci->lock, flags);
708 
709         status = ehci_readl(ehci, &ehci->regs->status);
710 
711         /* e.g. cardbus physical eject */
712         if (status == ~(u32) 0) {
713                 ehci_dbg (ehci, "device removed\n");
714                 goto dead;
715         }
716 
717         /*
718          * We don't use STS_FLR, but some controllers don't like it to
719          * remain on, so mask it out along with the other status bits.
720          */
721         masked_status = status & (INTR_MASK | STS_FLR);
722 
723         /* Shared IRQ? */
724         if (!masked_status || unlikely(ehci->rh_state == EHCI_RH_HALTED)) {
725                 spin_unlock_irqrestore(&ehci->lock, flags);
726                 return IRQ_NONE;
727         }
728 
729         /* clear (just) interrupts */
730         ehci_writel(ehci, masked_status, &ehci->regs->status);
731         cmd = ehci_readl(ehci, &ehci->regs->command);
732         bh = 0;
733 
734         /* normal [4.15.1.2] or error [4.15.1.1] completion */
735         if (likely ((status & (STS_INT|STS_ERR)) != 0)) {
736                 if (likely ((status & STS_ERR) == 0))
737                         COUNT (ehci->stats.normal);
738                 else
739                         COUNT (ehci->stats.error);
740                 bh = 1;
741         }
742 
743         /* complete the unlinking of some qh [4.15.2.3] */
744         if (status & STS_IAA) {
745 
746                 /* Turn off the IAA watchdog */
747                 ehci->enabled_hrtimer_events &= ~BIT(EHCI_HRTIMER_IAA_WATCHDOG);
748 
749                 /*
750                  * Mild optimization: Allow another IAAD to reset the
751                  * hrtimer, if one occurs before the next expiration.
752                  * In theory we could always cancel the hrtimer, but
753                  * tests show that about half the time it will be reset
754                  * for some other event anyway.
755                  */
756                 if (ehci->next_hrtimer_event == EHCI_HRTIMER_IAA_WATCHDOG)
757                         ++ehci->next_hrtimer_event;
758 
759                 /* guard against (alleged) silicon errata */
760                 if (cmd & CMD_IAAD)
761                         ehci_dbg(ehci, "IAA with IAAD still set?\n");
762                 if (ehci->iaa_in_progress)
763                         COUNT(ehci->stats.iaa);
764                 end_iaa_cycle(ehci);
765         }
766 
767         /* remote wakeup [4.3.1] */
768         if (status & STS_PCD) {
769                 unsigned        i = HCS_N_PORTS (ehci->hcs_params);
770                 u32             ppcd = ~0;
771 
772                 /* kick root hub later */
773                 pcd_status = status;
774 
775                 /* resume root hub? */
776                 if (ehci->rh_state == EHCI_RH_SUSPENDED)
777                         usb_hcd_resume_root_hub(hcd);
778 
779                 /* get per-port change detect bits */
780                 if (ehci->has_ppcd)
781                         ppcd = status >> 16;
782 
783                 while (i--) {
784                         int pstatus;
785 
786                         /* leverage per-port change bits feature */
787                         if (!(ppcd & (1 << i)))
788                                 continue;
789                         pstatus = ehci_readl(ehci,
790                                          &ehci->regs->port_status[i]);
791 
792                         if (pstatus & PORT_OWNER)
793                                 continue;
794                         if (!(test_bit(i, &ehci->suspended_ports) &&
795                                         ((pstatus & PORT_RESUME) ||
796                                                 !(pstatus & PORT_SUSPEND)) &&
797                                         (pstatus & PORT_PE) &&
798                                         ehci->reset_done[i] == 0))
799                                 continue;
800 
801                         /* start USB_RESUME_TIMEOUT msec resume signaling from
802                          * this port, and make hub_wq collect
803                          * PORT_STAT_C_SUSPEND to stop that signaling.
804                          */
805                         ehci->reset_done[i] = jiffies +
806                                 msecs_to_jiffies(USB_RESUME_TIMEOUT);
807                         set_bit(i, &ehci->resuming_ports);
808                         ehci_dbg (ehci, "port %d remote wakeup\n", i + 1);
809                         usb_hcd_start_port_resume(&hcd->self, i);
810                         mod_timer(&hcd->rh_timer, ehci->reset_done[i]);
811                 }
812         }
813 
814         /* PCI errors [4.15.2.4] */
815         if (unlikely ((status & STS_FATAL) != 0)) {
816                 ehci_err(ehci, "fatal error\n");
817                 dbg_cmd(ehci, "fatal", cmd);
818                 dbg_status(ehci, "fatal", status);
819 dead:
820                 usb_hc_died(hcd);
821 
822                 /* Don't let the controller do anything more */
823                 ehci->shutdown = true;
824                 ehci->rh_state = EHCI_RH_STOPPING;
825                 ehci->command &= ~(CMD_RUN | CMD_ASE | CMD_PSE);
826                 ehci_writel(ehci, ehci->command, &ehci->regs->command);
827                 ehci_writel(ehci, 0, &ehci->regs->intr_enable);
828                 ehci_handle_controller_death(ehci);
829 
830                 /* Handle completions when the controller stops */
831                 bh = 0;
832         }
833 
834         if (bh)
835                 ehci_work (ehci);
836         spin_unlock_irqrestore(&ehci->lock, flags);
837         if (pcd_status)
838                 usb_hcd_poll_rh_status(hcd);
839         return IRQ_HANDLED;
840 }
841 
842 /*-------------------------------------------------------------------------*/
843 
844 /*
845  * non-error returns are a promise to giveback() the urb later
846  * we drop ownership so next owner (or urb unlink) can get it
847  *
848  * urb + dev is in hcd.self.controller.urb_list
849  * we're queueing TDs onto software and hardware lists
850  *
851  * hcd-specific init for hcpriv hasn't been done yet
852  *
853  * NOTE:  control, bulk, and interrupt share the same code to append TDs
854  * to a (possibly active) QH, and the same QH scanning code.
855  */
856 static int ehci_urb_enqueue (
857         struct usb_hcd  *hcd,
858         struct urb      *urb,
859         gfp_t           mem_flags
860 ) {
861         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
862         struct list_head        qtd_list;
863 
864         INIT_LIST_HEAD (&qtd_list);
865 
866         switch (usb_pipetype (urb->pipe)) {
867         case PIPE_CONTROL:
868                 /* qh_completions() code doesn't handle all the fault cases
869                  * in multi-TD control transfers.  Even 1KB is rare anyway.
870                  */
871                 if (urb->transfer_buffer_length > (16 * 1024))
872                         return -EMSGSIZE;
873                 /* FALLTHROUGH */
874         /* case PIPE_BULK: */
875         default:
876                 if (!qh_urb_transaction (ehci, urb, &qtd_list, mem_flags))
877                         return -ENOMEM;
878                 return submit_async(ehci, urb, &qtd_list, mem_flags);
879 
880         case PIPE_INTERRUPT:
881                 if (!qh_urb_transaction (ehci, urb, &qtd_list, mem_flags))
882                         return -ENOMEM;
883                 return intr_submit(ehci, urb, &qtd_list, mem_flags);
884 
885         case PIPE_ISOCHRONOUS:
886                 if (urb->dev->speed == USB_SPEED_HIGH)
887                         return itd_submit (ehci, urb, mem_flags);
888                 else
889                         return sitd_submit (ehci, urb, mem_flags);
890         }
891 }
892 
893 /* remove from hardware lists
894  * completions normally happen asynchronously
895  */
896 
897 static int ehci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
898 {
899         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
900         struct ehci_qh          *qh;
901         unsigned long           flags;
902         int                     rc;
903 
904         spin_lock_irqsave (&ehci->lock, flags);
905         rc = usb_hcd_check_unlink_urb(hcd, urb, status);
906         if (rc)
907                 goto done;
908 
909         if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
910                 /*
911                  * We don't expedite dequeue for isochronous URBs.
912                  * Just wait until they complete normally or their
913                  * time slot expires.
914                  */
915         } else {
916                 qh = (struct ehci_qh *) urb->hcpriv;
917                 qh->unlink_reason |= QH_UNLINK_REQUESTED;
918                 switch (qh->qh_state) {
919                 case QH_STATE_LINKED:
920                         if (usb_pipetype(urb->pipe) == PIPE_INTERRUPT)
921                                 start_unlink_intr(ehci, qh);
922                         else
923                                 start_unlink_async(ehci, qh);
924                         break;
925                 case QH_STATE_COMPLETING:
926                         qh->dequeue_during_giveback = 1;
927                         break;
928                 case QH_STATE_UNLINK:
929                 case QH_STATE_UNLINK_WAIT:
930                         /* already started */
931                         break;
932                 case QH_STATE_IDLE:
933                         /* QH might be waiting for a Clear-TT-Buffer */
934                         qh_completions(ehci, qh);
935                         break;
936                 }
937         }
938 done:
939         spin_unlock_irqrestore (&ehci->lock, flags);
940         return rc;
941 }
942 
943 /*-------------------------------------------------------------------------*/
944 
945 // bulk qh holds the data toggle
946 
947 static void
948 ehci_endpoint_disable (struct usb_hcd *hcd, struct usb_host_endpoint *ep)
949 {
950         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
951         unsigned long           flags;
952         struct ehci_qh          *qh;
953 
954         /* ASSERT:  any requests/urbs are being unlinked */
955         /* ASSERT:  nobody can be submitting urbs for this any more */
956 
957 rescan:
958         spin_lock_irqsave (&ehci->lock, flags);
959         qh = ep->hcpriv;
960         if (!qh)
961                 goto done;
962 
963         /* endpoints can be iso streams.  for now, we don't
964          * accelerate iso completions ... so spin a while.
965          */
966         if (qh->hw == NULL) {
967                 struct ehci_iso_stream  *stream = ep->hcpriv;
968 
969                 if (!list_empty(&stream->td_list))
970                         goto idle_timeout;
971 
972                 /* BUG_ON(!list_empty(&stream->free_list)); */
973                 reserve_release_iso_bandwidth(ehci, stream, -1);
974                 kfree(stream);
975                 goto done;
976         }
977 
978         qh->unlink_reason |= QH_UNLINK_REQUESTED;
979         switch (qh->qh_state) {
980         case QH_STATE_LINKED:
981                 if (list_empty(&qh->qtd_list))
982                         qh->unlink_reason |= QH_UNLINK_QUEUE_EMPTY;
983                 else
984                         WARN_ON(1);
985                 if (usb_endpoint_type(&ep->desc) != USB_ENDPOINT_XFER_INT)
986                         start_unlink_async(ehci, qh);
987                 else
988                         start_unlink_intr(ehci, qh);
989                 /* FALL THROUGH */
990         case QH_STATE_COMPLETING:       /* already in unlinking */
991         case QH_STATE_UNLINK:           /* wait for hw to finish? */
992         case QH_STATE_UNLINK_WAIT:
993 idle_timeout:
994                 spin_unlock_irqrestore (&ehci->lock, flags);
995                 schedule_timeout_uninterruptible(1);
996                 goto rescan;
997         case QH_STATE_IDLE:             /* fully unlinked */
998                 if (qh->clearing_tt)
999                         goto idle_timeout;
1000                 if (list_empty (&qh->qtd_list)) {
1001                         if (qh->ps.bw_uperiod)
1002                                 reserve_release_intr_bandwidth(ehci, qh, -1);
1003                         qh_destroy(ehci, qh);
1004                         break;
1005                 }
1006                 /* else FALL THROUGH */
1007         default:
1008                 /* caller was supposed to have unlinked any requests;
1009                  * that's not our job.  just leak this memory.
1010                  */
1011                 ehci_err (ehci, "qh %p (#%02x) state %d%s\n",
1012                         qh, ep->desc.bEndpointAddress, qh->qh_state,
1013                         list_empty (&qh->qtd_list) ? "" : "(has tds)");
1014                 break;
1015         }
1016  done:
1017         ep->hcpriv = NULL;
1018         spin_unlock_irqrestore (&ehci->lock, flags);
1019 }
1020 
1021 static void
1022 ehci_endpoint_reset(struct usb_hcd *hcd, struct usb_host_endpoint *ep)
1023 {
1024         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
1025         struct ehci_qh          *qh;
1026         int                     eptype = usb_endpoint_type(&ep->desc);
1027         int                     epnum = usb_endpoint_num(&ep->desc);
1028         int                     is_out = usb_endpoint_dir_out(&ep->desc);
1029         unsigned long           flags;
1030 
1031         if (eptype != USB_ENDPOINT_XFER_BULK && eptype != USB_ENDPOINT_XFER_INT)
1032                 return;
1033 
1034         spin_lock_irqsave(&ehci->lock, flags);
1035         qh = ep->hcpriv;
1036 
1037         /* For Bulk and Interrupt endpoints we maintain the toggle state
1038          * in the hardware; the toggle bits in udev aren't used at all.
1039          * When an endpoint is reset by usb_clear_halt() we must reset
1040          * the toggle bit in the QH.
1041          */
1042         if (qh) {
1043                 if (!list_empty(&qh->qtd_list)) {
1044                         WARN_ONCE(1, "clear_halt for a busy endpoint\n");
1045                 } else {
1046                         /* The toggle value in the QH can't be updated
1047                          * while the QH is active.  Unlink it now;
1048                          * re-linking will call qh_refresh().
1049                          */
1050                         usb_settoggle(qh->ps.udev, epnum, is_out, 0);
1051                         qh->unlink_reason |= QH_UNLINK_REQUESTED;
1052                         if (eptype == USB_ENDPOINT_XFER_BULK)
1053                                 start_unlink_async(ehci, qh);
1054                         else
1055                                 start_unlink_intr(ehci, qh);
1056                 }
1057         }
1058         spin_unlock_irqrestore(&ehci->lock, flags);
1059 }
1060 
1061 static int ehci_get_frame (struct usb_hcd *hcd)
1062 {
1063         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
1064         return (ehci_read_frame_index(ehci) >> 3) % ehci->periodic_size;
1065 }
1066 
1067 /*-------------------------------------------------------------------------*/
1068 
1069 /* Device addition and removal */
1070 
1071 static void ehci_remove_device(struct usb_hcd *hcd, struct usb_device *udev)
1072 {
1073         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
1074 
1075         spin_lock_irq(&ehci->lock);
1076         drop_tt(udev);
1077         spin_unlock_irq(&ehci->lock);
1078 }
1079 
1080 /*-------------------------------------------------------------------------*/
1081 
1082 #ifdef  CONFIG_PM
1083 
1084 /* suspend/resume, section 4.3 */
1085 
1086 /* These routines handle the generic parts of controller suspend/resume */
1087 
1088 int ehci_suspend(struct usb_hcd *hcd, bool do_wakeup)
1089 {
1090         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
1091 
1092         if (time_before(jiffies, ehci->next_statechange))
1093                 msleep(10);
1094 
1095         /*
1096          * Root hub was already suspended.  Disable IRQ emission and
1097          * mark HW unaccessible.  The PM and USB cores make sure that
1098          * the root hub is either suspended or stopped.
1099          */
1100         ehci_prepare_ports_for_controller_suspend(ehci, do_wakeup);
1101 
1102         spin_lock_irq(&ehci->lock);
1103         ehci_writel(ehci, 0, &ehci->regs->intr_enable);
1104         (void) ehci_readl(ehci, &ehci->regs->intr_enable);
1105 
1106         clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
1107         spin_unlock_irq(&ehci->lock);
1108 
1109         synchronize_irq(hcd->irq);
1110 
1111         /* Check for race with a wakeup request */
1112         if (do_wakeup && HCD_WAKEUP_PENDING(hcd)) {
1113                 ehci_resume(hcd, false);
1114                 return -EBUSY;
1115         }
1116 
1117         return 0;
1118 }
1119 EXPORT_SYMBOL_GPL(ehci_suspend);
1120 
1121 /* Returns 0 if power was preserved, 1 if power was lost */
1122 int ehci_resume(struct usb_hcd *hcd, bool force_reset)
1123 {
1124         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
1125 
1126         if (time_before(jiffies, ehci->next_statechange))
1127                 msleep(100);
1128 
1129         /* Mark hardware accessible again as we are back to full power by now */
1130         set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
1131 
1132         if (ehci->shutdown)
1133                 return 0;               /* Controller is dead */
1134 
1135         /*
1136          * If CF is still set and reset isn't forced
1137          * then we maintained suspend power.
1138          * Just undo the effect of ehci_suspend().
1139          */
1140         if (ehci_readl(ehci, &ehci->regs->configured_flag) == FLAG_CF &&
1141                         !force_reset) {
1142                 int     mask = INTR_MASK;
1143 
1144                 ehci_prepare_ports_for_controller_resume(ehci);
1145 
1146                 spin_lock_irq(&ehci->lock);
1147                 if (ehci->shutdown)
1148                         goto skip;
1149 
1150                 if (!hcd->self.root_hub->do_remote_wakeup)
1151                         mask &= ~STS_PCD;
1152                 ehci_writel(ehci, mask, &ehci->regs->intr_enable);
1153                 ehci_readl(ehci, &ehci->regs->intr_enable);
1154  skip:
1155                 spin_unlock_irq(&ehci->lock);
1156                 return 0;
1157         }
1158 
1159         /*
1160          * Else reset, to cope with power loss or resume from hibernation
1161          * having let the firmware kick in during reboot.
1162          */
1163         usb_root_hub_lost_power(hcd->self.root_hub);
1164         (void) ehci_halt(ehci);
1165         (void) ehci_reset(ehci);
1166 
1167         spin_lock_irq(&ehci->lock);
1168         if (ehci->shutdown)
1169                 goto skip;
1170 
1171         ehci_writel(ehci, ehci->command, &ehci->regs->command);
1172         ehci_writel(ehci, FLAG_CF, &ehci->regs->configured_flag);
1173         ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
1174 
1175         ehci->rh_state = EHCI_RH_SUSPENDED;
1176         spin_unlock_irq(&ehci->lock);
1177 
1178         return 1;
1179 }
1180 EXPORT_SYMBOL_GPL(ehci_resume);
1181 
1182 #endif
1183 
1184 /*-------------------------------------------------------------------------*/
1185 
1186 /*
1187  * Generic structure: This gets copied for platform drivers so that
1188  * individual entries can be overridden as needed.
1189  */
1190 
1191 static const struct hc_driver ehci_hc_driver = {
1192         .description =          hcd_name,
1193         .product_desc =         "EHCI Host Controller",
1194         .hcd_priv_size =        sizeof(struct ehci_hcd),
1195 
1196         /*
1197          * generic hardware linkage
1198          */
1199         .irq =                  ehci_irq,
1200         .flags =                HCD_MEMORY | HCD_USB2 | HCD_BH,
1201 
1202         /*
1203          * basic lifecycle operations
1204          */
1205         .reset =                ehci_setup,
1206         .start =                ehci_run,
1207         .stop =                 ehci_stop,
1208         .shutdown =             ehci_shutdown,
1209 
1210         /*
1211          * managing i/o requests and associated device resources
1212          */
1213         .urb_enqueue =          ehci_urb_enqueue,
1214         .urb_dequeue =          ehci_urb_dequeue,
1215         .endpoint_disable =     ehci_endpoint_disable,
1216         .endpoint_reset =       ehci_endpoint_reset,
1217         .clear_tt_buffer_complete =     ehci_clear_tt_buffer_complete,
1218 
1219         /*
1220          * scheduling support
1221          */
1222         .get_frame_number =     ehci_get_frame,
1223 
1224         /*
1225          * root hub support
1226          */
1227         .hub_status_data =      ehci_hub_status_data,
1228         .hub_control =          ehci_hub_control,
1229         .bus_suspend =          ehci_bus_suspend,
1230         .bus_resume =           ehci_bus_resume,
1231         .relinquish_port =      ehci_relinquish_port,
1232         .port_handed_over =     ehci_port_handed_over,
1233 
1234         /*
1235          * device support
1236          */
1237         .free_dev =             ehci_remove_device,
1238 };
1239 
1240 void ehci_init_driver(struct hc_driver *drv,
1241                 const struct ehci_driver_overrides *over)
1242 {
1243         /* Copy the generic table to drv and then apply the overrides */
1244         *drv = ehci_hc_driver;
1245 
1246         if (over) {
1247                 drv->hcd_priv_size += over->extra_priv_size;
1248                 if (over->reset)
1249                         drv->reset = over->reset;
1250                 if (over->port_power)
1251                         drv->port_power = over->port_power;
1252         }
1253 }
1254 EXPORT_SYMBOL_GPL(ehci_init_driver);
1255 
1256 /*-------------------------------------------------------------------------*/
1257 
1258 MODULE_DESCRIPTION(DRIVER_DESC);
1259 MODULE_AUTHOR (DRIVER_AUTHOR);
1260 MODULE_LICENSE ("GPL");
1261 
1262 #ifdef CONFIG_USB_EHCI_SH
1263 #include "ehci-sh.c"
1264 #define PLATFORM_DRIVER         ehci_hcd_sh_driver
1265 #endif
1266 
1267 #ifdef CONFIG_PPC_PS3
1268 #include "ehci-ps3.c"
1269 #define PS3_SYSTEM_BUS_DRIVER   ps3_ehci_driver
1270 #endif
1271 
1272 #ifdef CONFIG_USB_EHCI_HCD_PPC_OF
1273 #include "ehci-ppc-of.c"
1274 #define OF_PLATFORM_DRIVER      ehci_hcd_ppc_of_driver
1275 #endif
1276 
1277 #ifdef CONFIG_XPS_USB_HCD_XILINX
1278 #include "ehci-xilinx-of.c"
1279 #define XILINX_OF_PLATFORM_DRIVER       ehci_hcd_xilinx_of_driver
1280 #endif
1281 
1282 #ifdef CONFIG_TILE_USB
1283 #include "ehci-tilegx.c"
1284 #define PLATFORM_DRIVER         ehci_hcd_tilegx_driver
1285 #endif
1286 
1287 #ifdef CONFIG_USB_EHCI_HCD_PMC_MSP
1288 #include "ehci-pmcmsp.c"
1289 #define PLATFORM_DRIVER         ehci_hcd_msp_driver
1290 #endif
1291 
1292 #ifdef CONFIG_SPARC_LEON
1293 #include "ehci-grlib.c"
1294 #define PLATFORM_DRIVER         ehci_grlib_driver
1295 #endif
1296 
1297 #ifdef CONFIG_USB_EHCI_MV
1298 #include "ehci-mv.c"
1299 #define        PLATFORM_DRIVER         ehci_mv_driver
1300 #endif
1301 
1302 #ifdef CONFIG_MIPS_SEAD3
1303 #include "ehci-sead3.c"
1304 #define PLATFORM_DRIVER         ehci_hcd_sead3_driver
1305 #endif
1306 
1307 static int __init ehci_hcd_init(void)
1308 {
1309         int retval = 0;
1310 
1311         if (usb_disabled())
1312                 return -ENODEV;
1313 
1314         printk(KERN_INFO "%s: " DRIVER_DESC "\n", hcd_name);
1315         set_bit(USB_EHCI_LOADED, &usb_hcds_loaded);
1316         if (test_bit(USB_UHCI_LOADED, &usb_hcds_loaded) ||
1317                         test_bit(USB_OHCI_LOADED, &usb_hcds_loaded))
1318                 printk(KERN_WARNING "Warning! ehci_hcd should always be loaded"
1319                                 " before uhci_hcd and ohci_hcd, not after\n");
1320 
1321         pr_debug("%s: block sizes: qh %Zd qtd %Zd itd %Zd sitd %Zd\n",
1322                  hcd_name,
1323                  sizeof(struct ehci_qh), sizeof(struct ehci_qtd),
1324                  sizeof(struct ehci_itd), sizeof(struct ehci_sitd));
1325 
1326 #ifdef CONFIG_DYNAMIC_DEBUG
1327         ehci_debug_root = debugfs_create_dir("ehci", usb_debug_root);
1328         if (!ehci_debug_root) {
1329                 retval = -ENOENT;
1330                 goto err_debug;
1331         }
1332 #endif
1333 
1334 #ifdef PLATFORM_DRIVER
1335         retval = platform_driver_register(&PLATFORM_DRIVER);
1336         if (retval < 0)
1337                 goto clean0;
1338 #endif
1339 
1340 #ifdef PS3_SYSTEM_BUS_DRIVER
1341         retval = ps3_ehci_driver_register(&PS3_SYSTEM_BUS_DRIVER);
1342         if (retval < 0)
1343                 goto clean2;
1344 #endif
1345 
1346 #ifdef OF_PLATFORM_DRIVER
1347         retval = platform_driver_register(&OF_PLATFORM_DRIVER);
1348         if (retval < 0)
1349                 goto clean3;
1350 #endif
1351 
1352 #ifdef XILINX_OF_PLATFORM_DRIVER
1353         retval = platform_driver_register(&XILINX_OF_PLATFORM_DRIVER);
1354         if (retval < 0)
1355                 goto clean4;
1356 #endif
1357         return retval;
1358 
1359 #ifdef XILINX_OF_PLATFORM_DRIVER
1360         /* platform_driver_unregister(&XILINX_OF_PLATFORM_DRIVER); */
1361 clean4:
1362 #endif
1363 #ifdef OF_PLATFORM_DRIVER
1364         platform_driver_unregister(&OF_PLATFORM_DRIVER);
1365 clean3:
1366 #endif
1367 #ifdef PS3_SYSTEM_BUS_DRIVER
1368         ps3_ehci_driver_unregister(&PS3_SYSTEM_BUS_DRIVER);
1369 clean2:
1370 #endif
1371 #ifdef PLATFORM_DRIVER
1372         platform_driver_unregister(&PLATFORM_DRIVER);
1373 clean0:
1374 #endif
1375 #ifdef CONFIG_DYNAMIC_DEBUG
1376         debugfs_remove(ehci_debug_root);
1377         ehci_debug_root = NULL;
1378 err_debug:
1379 #endif
1380         clear_bit(USB_EHCI_LOADED, &usb_hcds_loaded);
1381         return retval;
1382 }
1383 module_init(ehci_hcd_init);
1384 
1385 static void __exit ehci_hcd_cleanup(void)
1386 {
1387 #ifdef XILINX_OF_PLATFORM_DRIVER
1388         platform_driver_unregister(&XILINX_OF_PLATFORM_DRIVER);
1389 #endif
1390 #ifdef OF_PLATFORM_DRIVER
1391         platform_driver_unregister(&OF_PLATFORM_DRIVER);
1392 #endif
1393 #ifdef PLATFORM_DRIVER
1394         platform_driver_unregister(&PLATFORM_DRIVER);
1395 #endif
1396 #ifdef PS3_SYSTEM_BUS_DRIVER
1397         ps3_ehci_driver_unregister(&PS3_SYSTEM_BUS_DRIVER);
1398 #endif
1399 #ifdef CONFIG_DYNAMIC_DEBUG
1400         debugfs_remove(ehci_debug_root);
1401 #endif
1402         clear_bit(USB_EHCI_LOADED, &usb_hcds_loaded);
1403 }
1404 module_exit(ehci_hcd_cleanup);
1405 

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