Version:  2.0.40 2.2.26 2.4.37 3.6 3.7 3.8 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

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 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_unlink_async(struct ehci_hcd *ehci);
310 static void unlink_empty_async(struct ehci_hcd *ehci);
311 static void unlink_empty_async_suspended(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         return 0;
569 }
570 
571 /* start HC running; it's halted, ehci_init() has been run (once) */
572 static int ehci_run (struct usb_hcd *hcd)
573 {
574         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
575         u32                     temp;
576         u32                     hcc_params;
577 
578         hcd->uses_new_polling = 1;
579 
580         /* EHCI spec section 4.1 */
581 
582         ehci_writel(ehci, ehci->periodic_dma, &ehci->regs->frame_list);
583         ehci_writel(ehci, (u32)ehci->async->qh_dma, &ehci->regs->async_next);
584 
585         /*
586          * hcc_params controls whether ehci->regs->segment must (!!!)
587          * be used; it constrains QH/ITD/SITD and QTD locations.
588          * pci_pool consistent memory always uses segment zero.
589          * streaming mappings for I/O buffers, like pci_map_single(),
590          * can return segments above 4GB, if the device allows.
591          *
592          * NOTE:  the dma mask is visible through dma_supported(), so
593          * drivers can pass this info along ... like NETIF_F_HIGHDMA,
594          * Scsi_Host.highmem_io, and so forth.  It's readonly to all
595          * host side drivers though.
596          */
597         hcc_params = ehci_readl(ehci, &ehci->caps->hcc_params);
598         if (HCC_64BIT_ADDR(hcc_params)) {
599                 ehci_writel(ehci, 0, &ehci->regs->segment);
600 #if 0
601 // this is deeply broken on almost all architectures
602                 if (!dma_set_mask(hcd->self.controller, DMA_BIT_MASK(64)))
603                         ehci_info(ehci, "enabled 64bit DMA\n");
604 #endif
605         }
606 
607 
608         // Philips, Intel, and maybe others need CMD_RUN before the
609         // root hub will detect new devices (why?); NEC doesn't
610         ehci->command &= ~(CMD_LRESET|CMD_IAAD|CMD_PSE|CMD_ASE|CMD_RESET);
611         ehci->command |= CMD_RUN;
612         ehci_writel(ehci, ehci->command, &ehci->regs->command);
613         dbg_cmd (ehci, "init", ehci->command);
614 
615         /*
616          * Start, enabling full USB 2.0 functionality ... usb 1.1 devices
617          * are explicitly handed to companion controller(s), so no TT is
618          * involved with the root hub.  (Except where one is integrated,
619          * and there's no companion controller unless maybe for USB OTG.)
620          *
621          * Turning on the CF flag will transfer ownership of all ports
622          * from the companions to the EHCI controller.  If any of the
623          * companions are in the middle of a port reset at the time, it
624          * could cause trouble.  Write-locking ehci_cf_port_reset_rwsem
625          * guarantees that no resets are in progress.  After we set CF,
626          * a short delay lets the hardware catch up; new resets shouldn't
627          * be started before the port switching actions could complete.
628          */
629         down_write(&ehci_cf_port_reset_rwsem);
630         ehci->rh_state = EHCI_RH_RUNNING;
631         ehci_writel(ehci, FLAG_CF, &ehci->regs->configured_flag);
632         ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
633         msleep(5);
634         up_write(&ehci_cf_port_reset_rwsem);
635         ehci->last_periodic_enable = ktime_get_real();
636 
637         temp = HC_VERSION(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase));
638         ehci_info (ehci,
639                 "USB %x.%x started, EHCI %x.%02x%s\n",
640                 ((ehci->sbrn & 0xf0)>>4), (ehci->sbrn & 0x0f),
641                 temp >> 8, temp & 0xff,
642                 ignore_oc ? ", overcurrent ignored" : "");
643 
644         ehci_writel(ehci, INTR_MASK,
645                     &ehci->regs->intr_enable); /* Turn On Interrupts */
646 
647         /* GRR this is run-once init(), being done every time the HC starts.
648          * So long as they're part of class devices, we can't do it init()
649          * since the class device isn't created that early.
650          */
651         create_debug_files(ehci);
652         create_sysfs_files(ehci);
653 
654         return 0;
655 }
656 
657 int ehci_setup(struct usb_hcd *hcd)
658 {
659         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
660         int retval;
661 
662         ehci->regs = (void __iomem *)ehci->caps +
663             HC_LENGTH(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase));
664         dbg_hcs_params(ehci, "reset");
665         dbg_hcc_params(ehci, "reset");
666 
667         /* cache this readonly data; minimize chip reads */
668         ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
669 
670         ehci->sbrn = HCD_USB2;
671 
672         /* data structure init */
673         retval = ehci_init(hcd);
674         if (retval)
675                 return retval;
676 
677         retval = ehci_halt(ehci);
678         if (retval)
679                 return retval;
680 
681         ehci_reset(ehci);
682 
683         return 0;
684 }
685 EXPORT_SYMBOL_GPL(ehci_setup);
686 
687 /*-------------------------------------------------------------------------*/
688 
689 static irqreturn_t ehci_irq (struct usb_hcd *hcd)
690 {
691         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
692         u32                     status, masked_status, pcd_status = 0, cmd;
693         int                     bh;
694         unsigned long           flags;
695 
696         /*
697          * For threadirqs option we use spin_lock_irqsave() variant to prevent
698          * deadlock with ehci hrtimer callback, because hrtimer callbacks run
699          * in interrupt context even when threadirqs is specified. We can go
700          * back to spin_lock() variant when hrtimer callbacks become threaded.
701          */
702         spin_lock_irqsave(&ehci->lock, flags);
703 
704         status = ehci_readl(ehci, &ehci->regs->status);
705 
706         /* e.g. cardbus physical eject */
707         if (status == ~(u32) 0) {
708                 ehci_dbg (ehci, "device removed\n");
709                 goto dead;
710         }
711 
712         /*
713          * We don't use STS_FLR, but some controllers don't like it to
714          * remain on, so mask it out along with the other status bits.
715          */
716         masked_status = status & (INTR_MASK | STS_FLR);
717 
718         /* Shared IRQ? */
719         if (!masked_status || unlikely(ehci->rh_state == EHCI_RH_HALTED)) {
720                 spin_unlock_irqrestore(&ehci->lock, flags);
721                 return IRQ_NONE;
722         }
723 
724         /* clear (just) interrupts */
725         ehci_writel(ehci, masked_status, &ehci->regs->status);
726         cmd = ehci_readl(ehci, &ehci->regs->command);
727         bh = 0;
728 
729         /* normal [4.15.1.2] or error [4.15.1.1] completion */
730         if (likely ((status & (STS_INT|STS_ERR)) != 0)) {
731                 if (likely ((status & STS_ERR) == 0))
732                         COUNT (ehci->stats.normal);
733                 else
734                         COUNT (ehci->stats.error);
735                 bh = 1;
736         }
737 
738         /* complete the unlinking of some qh [4.15.2.3] */
739         if (status & STS_IAA) {
740 
741                 /* Turn off the IAA watchdog */
742                 ehci->enabled_hrtimer_events &= ~BIT(EHCI_HRTIMER_IAA_WATCHDOG);
743 
744                 /*
745                  * Mild optimization: Allow another IAAD to reset the
746                  * hrtimer, if one occurs before the next expiration.
747                  * In theory we could always cancel the hrtimer, but
748                  * tests show that about half the time it will be reset
749                  * for some other event anyway.
750                  */
751                 if (ehci->next_hrtimer_event == EHCI_HRTIMER_IAA_WATCHDOG)
752                         ++ehci->next_hrtimer_event;
753 
754                 /* guard against (alleged) silicon errata */
755                 if (cmd & CMD_IAAD)
756                         ehci_dbg(ehci, "IAA with IAAD still set?\n");
757                 if (ehci->iaa_in_progress)
758                         COUNT(ehci->stats.iaa);
759                 end_unlink_async(ehci);
760         }
761 
762         /* remote wakeup [4.3.1] */
763         if (status & STS_PCD) {
764                 unsigned        i = HCS_N_PORTS (ehci->hcs_params);
765                 u32             ppcd = ~0;
766 
767                 /* kick root hub later */
768                 pcd_status = status;
769 
770                 /* resume root hub? */
771                 if (ehci->rh_state == EHCI_RH_SUSPENDED)
772                         usb_hcd_resume_root_hub(hcd);
773 
774                 /* get per-port change detect bits */
775                 if (ehci->has_ppcd)
776                         ppcd = status >> 16;
777 
778                 while (i--) {
779                         int pstatus;
780 
781                         /* leverage per-port change bits feature */
782                         if (!(ppcd & (1 << i)))
783                                 continue;
784                         pstatus = ehci_readl(ehci,
785                                          &ehci->regs->port_status[i]);
786 
787                         if (pstatus & PORT_OWNER)
788                                 continue;
789                         if (!(test_bit(i, &ehci->suspended_ports) &&
790                                         ((pstatus & PORT_RESUME) ||
791                                                 !(pstatus & PORT_SUSPEND)) &&
792                                         (pstatus & PORT_PE) &&
793                                         ehci->reset_done[i] == 0))
794                                 continue;
795 
796                         /* start USB_RESUME_TIMEOUT msec resume signaling from
797                          * this port, and make hub_wq collect
798                          * PORT_STAT_C_SUSPEND to stop that signaling.
799                          */
800                         ehci->reset_done[i] = jiffies +
801                                 msecs_to_jiffies(USB_RESUME_TIMEOUT);
802                         set_bit(i, &ehci->resuming_ports);
803                         ehci_dbg (ehci, "port %d remote wakeup\n", i + 1);
804                         usb_hcd_start_port_resume(&hcd->self, i);
805                         mod_timer(&hcd->rh_timer, ehci->reset_done[i]);
806                 }
807         }
808 
809         /* PCI errors [4.15.2.4] */
810         if (unlikely ((status & STS_FATAL) != 0)) {
811                 ehci_err(ehci, "fatal error\n");
812                 dbg_cmd(ehci, "fatal", cmd);
813                 dbg_status(ehci, "fatal", status);
814 dead:
815                 usb_hc_died(hcd);
816 
817                 /* Don't let the controller do anything more */
818                 ehci->shutdown = true;
819                 ehci->rh_state = EHCI_RH_STOPPING;
820                 ehci->command &= ~(CMD_RUN | CMD_ASE | CMD_PSE);
821                 ehci_writel(ehci, ehci->command, &ehci->regs->command);
822                 ehci_writel(ehci, 0, &ehci->regs->intr_enable);
823                 ehci_handle_controller_death(ehci);
824 
825                 /* Handle completions when the controller stops */
826                 bh = 0;
827         }
828 
829         if (bh)
830                 ehci_work (ehci);
831         spin_unlock_irqrestore(&ehci->lock, flags);
832         if (pcd_status)
833                 usb_hcd_poll_rh_status(hcd);
834         return IRQ_HANDLED;
835 }
836 
837 /*-------------------------------------------------------------------------*/
838 
839 /*
840  * non-error returns are a promise to giveback() the urb later
841  * we drop ownership so next owner (or urb unlink) can get it
842  *
843  * urb + dev is in hcd.self.controller.urb_list
844  * we're queueing TDs onto software and hardware lists
845  *
846  * hcd-specific init for hcpriv hasn't been done yet
847  *
848  * NOTE:  control, bulk, and interrupt share the same code to append TDs
849  * to a (possibly active) QH, and the same QH scanning code.
850  */
851 static int ehci_urb_enqueue (
852         struct usb_hcd  *hcd,
853         struct urb      *urb,
854         gfp_t           mem_flags
855 ) {
856         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
857         struct list_head        qtd_list;
858 
859         INIT_LIST_HEAD (&qtd_list);
860 
861         switch (usb_pipetype (urb->pipe)) {
862         case PIPE_CONTROL:
863                 /* qh_completions() code doesn't handle all the fault cases
864                  * in multi-TD control transfers.  Even 1KB is rare anyway.
865                  */
866                 if (urb->transfer_buffer_length > (16 * 1024))
867                         return -EMSGSIZE;
868                 /* FALLTHROUGH */
869         /* case PIPE_BULK: */
870         default:
871                 if (!qh_urb_transaction (ehci, urb, &qtd_list, mem_flags))
872                         return -ENOMEM;
873                 return submit_async(ehci, urb, &qtd_list, mem_flags);
874 
875         case PIPE_INTERRUPT:
876                 if (!qh_urb_transaction (ehci, urb, &qtd_list, mem_flags))
877                         return -ENOMEM;
878                 return intr_submit(ehci, urb, &qtd_list, mem_flags);
879 
880         case PIPE_ISOCHRONOUS:
881                 if (urb->dev->speed == USB_SPEED_HIGH)
882                         return itd_submit (ehci, urb, mem_flags);
883                 else
884                         return sitd_submit (ehci, urb, mem_flags);
885         }
886 }
887 
888 /* remove from hardware lists
889  * completions normally happen asynchronously
890  */
891 
892 static int ehci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
893 {
894         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
895         struct ehci_qh          *qh;
896         unsigned long           flags;
897         int                     rc;
898 
899         spin_lock_irqsave (&ehci->lock, flags);
900         rc = usb_hcd_check_unlink_urb(hcd, urb, status);
901         if (rc)
902                 goto done;
903 
904         if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
905                 /*
906                  * We don't expedite dequeue for isochronous URBs.
907                  * Just wait until they complete normally or their
908                  * time slot expires.
909                  */
910         } else {
911                 qh = (struct ehci_qh *) urb->hcpriv;
912                 qh->exception = 1;
913                 switch (qh->qh_state) {
914                 case QH_STATE_LINKED:
915                         if (usb_pipetype(urb->pipe) == PIPE_INTERRUPT)
916                                 start_unlink_intr(ehci, qh);
917                         else
918                                 start_unlink_async(ehci, qh);
919                         break;
920                 case QH_STATE_COMPLETING:
921                         qh->dequeue_during_giveback = 1;
922                         break;
923                 case QH_STATE_UNLINK:
924                 case QH_STATE_UNLINK_WAIT:
925                         /* already started */
926                         break;
927                 case QH_STATE_IDLE:
928                         /* QH might be waiting for a Clear-TT-Buffer */
929                         qh_completions(ehci, qh);
930                         break;
931                 }
932         }
933 done:
934         spin_unlock_irqrestore (&ehci->lock, flags);
935         return rc;
936 }
937 
938 /*-------------------------------------------------------------------------*/
939 
940 // bulk qh holds the data toggle
941 
942 static void
943 ehci_endpoint_disable (struct usb_hcd *hcd, struct usb_host_endpoint *ep)
944 {
945         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
946         unsigned long           flags;
947         struct ehci_qh          *qh;
948 
949         /* ASSERT:  any requests/urbs are being unlinked */
950         /* ASSERT:  nobody can be submitting urbs for this any more */
951 
952 rescan:
953         spin_lock_irqsave (&ehci->lock, flags);
954         qh = ep->hcpriv;
955         if (!qh)
956                 goto done;
957 
958         /* endpoints can be iso streams.  for now, we don't
959          * accelerate iso completions ... so spin a while.
960          */
961         if (qh->hw == NULL) {
962                 struct ehci_iso_stream  *stream = ep->hcpriv;
963 
964                 if (!list_empty(&stream->td_list))
965                         goto idle_timeout;
966 
967                 /* BUG_ON(!list_empty(&stream->free_list)); */
968                 reserve_release_iso_bandwidth(ehci, stream, -1);
969                 kfree(stream);
970                 goto done;
971         }
972 
973         qh->exception = 1;
974         switch (qh->qh_state) {
975         case QH_STATE_LINKED:
976                 WARN_ON(!list_empty(&qh->qtd_list));
977                 if (usb_endpoint_type(&ep->desc) != USB_ENDPOINT_XFER_INT)
978                         start_unlink_async(ehci, qh);
979                 else
980                         start_unlink_intr(ehci, qh);
981                 /* FALL THROUGH */
982         case QH_STATE_COMPLETING:       /* already in unlinking */
983         case QH_STATE_UNLINK:           /* wait for hw to finish? */
984         case QH_STATE_UNLINK_WAIT:
985 idle_timeout:
986                 spin_unlock_irqrestore (&ehci->lock, flags);
987                 schedule_timeout_uninterruptible(1);
988                 goto rescan;
989         case QH_STATE_IDLE:             /* fully unlinked */
990                 if (qh->clearing_tt)
991                         goto idle_timeout;
992                 if (list_empty (&qh->qtd_list)) {
993                         if (qh->ps.bw_uperiod)
994                                 reserve_release_intr_bandwidth(ehci, qh, -1);
995                         qh_destroy(ehci, qh);
996                         break;
997                 }
998                 /* else FALL THROUGH */
999         default:
1000                 /* caller was supposed to have unlinked any requests;
1001                  * that's not our job.  just leak this memory.
1002                  */
1003                 ehci_err (ehci, "qh %p (#%02x) state %d%s\n",
1004                         qh, ep->desc.bEndpointAddress, qh->qh_state,
1005                         list_empty (&qh->qtd_list) ? "" : "(has tds)");
1006                 break;
1007         }
1008  done:
1009         ep->hcpriv = NULL;
1010         spin_unlock_irqrestore (&ehci->lock, flags);
1011 }
1012 
1013 static void
1014 ehci_endpoint_reset(struct usb_hcd *hcd, struct usb_host_endpoint *ep)
1015 {
1016         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
1017         struct ehci_qh          *qh;
1018         int                     eptype = usb_endpoint_type(&ep->desc);
1019         int                     epnum = usb_endpoint_num(&ep->desc);
1020         int                     is_out = usb_endpoint_dir_out(&ep->desc);
1021         unsigned long           flags;
1022 
1023         if (eptype != USB_ENDPOINT_XFER_BULK && eptype != USB_ENDPOINT_XFER_INT)
1024                 return;
1025 
1026         spin_lock_irqsave(&ehci->lock, flags);
1027         qh = ep->hcpriv;
1028 
1029         /* For Bulk and Interrupt endpoints we maintain the toggle state
1030          * in the hardware; the toggle bits in udev aren't used at all.
1031          * When an endpoint is reset by usb_clear_halt() we must reset
1032          * the toggle bit in the QH.
1033          */
1034         if (qh) {
1035                 if (!list_empty(&qh->qtd_list)) {
1036                         WARN_ONCE(1, "clear_halt for a busy endpoint\n");
1037                 } else {
1038                         /* The toggle value in the QH can't be updated
1039                          * while the QH is active.  Unlink it now;
1040                          * re-linking will call qh_refresh().
1041                          */
1042                         usb_settoggle(qh->ps.udev, epnum, is_out, 0);
1043                         qh->exception = 1;
1044                         if (eptype == USB_ENDPOINT_XFER_BULK)
1045                                 start_unlink_async(ehci, qh);
1046                         else
1047                                 start_unlink_intr(ehci, qh);
1048                 }
1049         }
1050         spin_unlock_irqrestore(&ehci->lock, flags);
1051 }
1052 
1053 static int ehci_get_frame (struct usb_hcd *hcd)
1054 {
1055         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
1056         return (ehci_read_frame_index(ehci) >> 3) % ehci->periodic_size;
1057 }
1058 
1059 /*-------------------------------------------------------------------------*/
1060 
1061 /* Device addition and removal */
1062 
1063 static void ehci_remove_device(struct usb_hcd *hcd, struct usb_device *udev)
1064 {
1065         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
1066 
1067         spin_lock_irq(&ehci->lock);
1068         drop_tt(udev);
1069         spin_unlock_irq(&ehci->lock);
1070 }
1071 
1072 /*-------------------------------------------------------------------------*/
1073 
1074 #ifdef  CONFIG_PM
1075 
1076 /* suspend/resume, section 4.3 */
1077 
1078 /* These routines handle the generic parts of controller suspend/resume */
1079 
1080 int ehci_suspend(struct usb_hcd *hcd, bool do_wakeup)
1081 {
1082         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
1083 
1084         if (time_before(jiffies, ehci->next_statechange))
1085                 msleep(10);
1086 
1087         /*
1088          * Root hub was already suspended.  Disable IRQ emission and
1089          * mark HW unaccessible.  The PM and USB cores make sure that
1090          * the root hub is either suspended or stopped.
1091          */
1092         ehci_prepare_ports_for_controller_suspend(ehci, do_wakeup);
1093 
1094         spin_lock_irq(&ehci->lock);
1095         ehci_writel(ehci, 0, &ehci->regs->intr_enable);
1096         (void) ehci_readl(ehci, &ehci->regs->intr_enable);
1097 
1098         clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
1099         spin_unlock_irq(&ehci->lock);
1100 
1101         synchronize_irq(hcd->irq);
1102 
1103         /* Check for race with a wakeup request */
1104         if (do_wakeup && HCD_WAKEUP_PENDING(hcd)) {
1105                 ehci_resume(hcd, false);
1106                 return -EBUSY;
1107         }
1108 
1109         return 0;
1110 }
1111 EXPORT_SYMBOL_GPL(ehci_suspend);
1112 
1113 /* Returns 0 if power was preserved, 1 if power was lost */
1114 int ehci_resume(struct usb_hcd *hcd, bool force_reset)
1115 {
1116         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
1117 
1118         if (time_before(jiffies, ehci->next_statechange))
1119                 msleep(100);
1120 
1121         /* Mark hardware accessible again as we are back to full power by now */
1122         set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
1123 
1124         if (ehci->shutdown)
1125                 return 0;               /* Controller is dead */
1126 
1127         /*
1128          * If CF is still set and reset isn't forced
1129          * then we maintained suspend power.
1130          * Just undo the effect of ehci_suspend().
1131          */
1132         if (ehci_readl(ehci, &ehci->regs->configured_flag) == FLAG_CF &&
1133                         !force_reset) {
1134                 int     mask = INTR_MASK;
1135 
1136                 ehci_prepare_ports_for_controller_resume(ehci);
1137 
1138                 spin_lock_irq(&ehci->lock);
1139                 if (ehci->shutdown)
1140                         goto skip;
1141 
1142                 if (!hcd->self.root_hub->do_remote_wakeup)
1143                         mask &= ~STS_PCD;
1144                 ehci_writel(ehci, mask, &ehci->regs->intr_enable);
1145                 ehci_readl(ehci, &ehci->regs->intr_enable);
1146  skip:
1147                 spin_unlock_irq(&ehci->lock);
1148                 return 0;
1149         }
1150 
1151         /*
1152          * Else reset, to cope with power loss or resume from hibernation
1153          * having let the firmware kick in during reboot.
1154          */
1155         usb_root_hub_lost_power(hcd->self.root_hub);
1156         (void) ehci_halt(ehci);
1157         (void) ehci_reset(ehci);
1158 
1159         spin_lock_irq(&ehci->lock);
1160         if (ehci->shutdown)
1161                 goto skip;
1162 
1163         ehci_writel(ehci, ehci->command, &ehci->regs->command);
1164         ehci_writel(ehci, FLAG_CF, &ehci->regs->configured_flag);
1165         ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
1166 
1167         ehci->rh_state = EHCI_RH_SUSPENDED;
1168         spin_unlock_irq(&ehci->lock);
1169 
1170         return 1;
1171 }
1172 EXPORT_SYMBOL_GPL(ehci_resume);
1173 
1174 #endif
1175 
1176 /*-------------------------------------------------------------------------*/
1177 
1178 /*
1179  * Generic structure: This gets copied for platform drivers so that
1180  * individual entries can be overridden as needed.
1181  */
1182 
1183 static const struct hc_driver ehci_hc_driver = {
1184         .description =          hcd_name,
1185         .product_desc =         "EHCI Host Controller",
1186         .hcd_priv_size =        sizeof(struct ehci_hcd),
1187 
1188         /*
1189          * generic hardware linkage
1190          */
1191         .irq =                  ehci_irq,
1192         .flags =                HCD_MEMORY | HCD_USB2 | HCD_BH,
1193 
1194         /*
1195          * basic lifecycle operations
1196          */
1197         .reset =                ehci_setup,
1198         .start =                ehci_run,
1199         .stop =                 ehci_stop,
1200         .shutdown =             ehci_shutdown,
1201 
1202         /*
1203          * managing i/o requests and associated device resources
1204          */
1205         .urb_enqueue =          ehci_urb_enqueue,
1206         .urb_dequeue =          ehci_urb_dequeue,
1207         .endpoint_disable =     ehci_endpoint_disable,
1208         .endpoint_reset =       ehci_endpoint_reset,
1209         .clear_tt_buffer_complete =     ehci_clear_tt_buffer_complete,
1210 
1211         /*
1212          * scheduling support
1213          */
1214         .get_frame_number =     ehci_get_frame,
1215 
1216         /*
1217          * root hub support
1218          */
1219         .hub_status_data =      ehci_hub_status_data,
1220         .hub_control =          ehci_hub_control,
1221         .bus_suspend =          ehci_bus_suspend,
1222         .bus_resume =           ehci_bus_resume,
1223         .relinquish_port =      ehci_relinquish_port,
1224         .port_handed_over =     ehci_port_handed_over,
1225 
1226         /*
1227          * device support
1228          */
1229         .free_dev =             ehci_remove_device,
1230 };
1231 
1232 void ehci_init_driver(struct hc_driver *drv,
1233                 const struct ehci_driver_overrides *over)
1234 {
1235         /* Copy the generic table to drv and then apply the overrides */
1236         *drv = ehci_hc_driver;
1237 
1238         if (over) {
1239                 drv->hcd_priv_size += over->extra_priv_size;
1240                 if (over->reset)
1241                         drv->reset = over->reset;
1242                 if (over->port_power)
1243                         drv->port_power = over->port_power;
1244         }
1245 }
1246 EXPORT_SYMBOL_GPL(ehci_init_driver);
1247 
1248 /*-------------------------------------------------------------------------*/
1249 
1250 MODULE_DESCRIPTION(DRIVER_DESC);
1251 MODULE_AUTHOR (DRIVER_AUTHOR);
1252 MODULE_LICENSE ("GPL");
1253 
1254 #ifdef CONFIG_USB_EHCI_SH
1255 #include "ehci-sh.c"
1256 #define PLATFORM_DRIVER         ehci_hcd_sh_driver
1257 #endif
1258 
1259 #ifdef CONFIG_PPC_PS3
1260 #include "ehci-ps3.c"
1261 #define PS3_SYSTEM_BUS_DRIVER   ps3_ehci_driver
1262 #endif
1263 
1264 #ifdef CONFIG_USB_EHCI_HCD_PPC_OF
1265 #include "ehci-ppc-of.c"
1266 #define OF_PLATFORM_DRIVER      ehci_hcd_ppc_of_driver
1267 #endif
1268 
1269 #ifdef CONFIG_XPS_USB_HCD_XILINX
1270 #include "ehci-xilinx-of.c"
1271 #define XILINX_OF_PLATFORM_DRIVER       ehci_hcd_xilinx_of_driver
1272 #endif
1273 
1274 #ifdef CONFIG_TILE_USB
1275 #include "ehci-tilegx.c"
1276 #define PLATFORM_DRIVER         ehci_hcd_tilegx_driver
1277 #endif
1278 
1279 #ifdef CONFIG_USB_EHCI_HCD_PMC_MSP
1280 #include "ehci-pmcmsp.c"
1281 #define PLATFORM_DRIVER         ehci_hcd_msp_driver
1282 #endif
1283 
1284 #ifdef CONFIG_SPARC_LEON
1285 #include "ehci-grlib.c"
1286 #define PLATFORM_DRIVER         ehci_grlib_driver
1287 #endif
1288 
1289 #ifdef CONFIG_USB_EHCI_MV
1290 #include "ehci-mv.c"
1291 #define        PLATFORM_DRIVER         ehci_mv_driver
1292 #endif
1293 
1294 #ifdef CONFIG_MIPS_SEAD3
1295 #include "ehci-sead3.c"
1296 #define PLATFORM_DRIVER         ehci_hcd_sead3_driver
1297 #endif
1298 
1299 static int __init ehci_hcd_init(void)
1300 {
1301         int retval = 0;
1302 
1303         if (usb_disabled())
1304                 return -ENODEV;
1305 
1306         printk(KERN_INFO "%s: " DRIVER_DESC "\n", hcd_name);
1307         set_bit(USB_EHCI_LOADED, &usb_hcds_loaded);
1308         if (test_bit(USB_UHCI_LOADED, &usb_hcds_loaded) ||
1309                         test_bit(USB_OHCI_LOADED, &usb_hcds_loaded))
1310                 printk(KERN_WARNING "Warning! ehci_hcd should always be loaded"
1311                                 " before uhci_hcd and ohci_hcd, not after\n");
1312 
1313         pr_debug("%s: block sizes: qh %Zd qtd %Zd itd %Zd sitd %Zd\n",
1314                  hcd_name,
1315                  sizeof(struct ehci_qh), sizeof(struct ehci_qtd),
1316                  sizeof(struct ehci_itd), sizeof(struct ehci_sitd));
1317 
1318 #ifdef CONFIG_DYNAMIC_DEBUG
1319         ehci_debug_root = debugfs_create_dir("ehci", usb_debug_root);
1320         if (!ehci_debug_root) {
1321                 retval = -ENOENT;
1322                 goto err_debug;
1323         }
1324 #endif
1325 
1326 #ifdef PLATFORM_DRIVER
1327         retval = platform_driver_register(&PLATFORM_DRIVER);
1328         if (retval < 0)
1329                 goto clean0;
1330 #endif
1331 
1332 #ifdef PS3_SYSTEM_BUS_DRIVER
1333         retval = ps3_ehci_driver_register(&PS3_SYSTEM_BUS_DRIVER);
1334         if (retval < 0)
1335                 goto clean2;
1336 #endif
1337 
1338 #ifdef OF_PLATFORM_DRIVER
1339         retval = platform_driver_register(&OF_PLATFORM_DRIVER);
1340         if (retval < 0)
1341                 goto clean3;
1342 #endif
1343 
1344 #ifdef XILINX_OF_PLATFORM_DRIVER
1345         retval = platform_driver_register(&XILINX_OF_PLATFORM_DRIVER);
1346         if (retval < 0)
1347                 goto clean4;
1348 #endif
1349         return retval;
1350 
1351 #ifdef XILINX_OF_PLATFORM_DRIVER
1352         /* platform_driver_unregister(&XILINX_OF_PLATFORM_DRIVER); */
1353 clean4:
1354 #endif
1355 #ifdef OF_PLATFORM_DRIVER
1356         platform_driver_unregister(&OF_PLATFORM_DRIVER);
1357 clean3:
1358 #endif
1359 #ifdef PS3_SYSTEM_BUS_DRIVER
1360         ps3_ehci_driver_unregister(&PS3_SYSTEM_BUS_DRIVER);
1361 clean2:
1362 #endif
1363 #ifdef PLATFORM_DRIVER
1364         platform_driver_unregister(&PLATFORM_DRIVER);
1365 clean0:
1366 #endif
1367 #ifdef CONFIG_DYNAMIC_DEBUG
1368         debugfs_remove(ehci_debug_root);
1369         ehci_debug_root = NULL;
1370 err_debug:
1371 #endif
1372         clear_bit(USB_EHCI_LOADED, &usb_hcds_loaded);
1373         return retval;
1374 }
1375 module_init(ehci_hcd_init);
1376 
1377 static void __exit ehci_hcd_cleanup(void)
1378 {
1379 #ifdef XILINX_OF_PLATFORM_DRIVER
1380         platform_driver_unregister(&XILINX_OF_PLATFORM_DRIVER);
1381 #endif
1382 #ifdef OF_PLATFORM_DRIVER
1383         platform_driver_unregister(&OF_PLATFORM_DRIVER);
1384 #endif
1385 #ifdef PLATFORM_DRIVER
1386         platform_driver_unregister(&PLATFORM_DRIVER);
1387 #endif
1388 #ifdef PS3_SYSTEM_BUS_DRIVER
1389         ps3_ehci_driver_unregister(&PS3_SYSTEM_BUS_DRIVER);
1390 #endif
1391 #ifdef CONFIG_DYNAMIC_DEBUG
1392         debugfs_remove(ehci_debug_root);
1393 #endif
1394         clear_bit(USB_EHCI_LOADED, &usb_hcds_loaded);
1395 }
1396 module_exit(ehci_hcd_cleanup);
1397 

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