Version:  2.0.40 2.2.26 2.4.37 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19

Linux/drivers/usb/host/ehci-hcd.c

  1 /*
  2  * Enhanced Host Controller Interface (EHCI) driver for USB.
  3  *
  4  * Maintainer: Alan Stern <stern@rowland.harvard.edu>
  5  *
  6  * Copyright (c) 2000-2004 by David Brownell
  7  *
  8  * This program is free software; you can redistribute it and/or modify it
  9  * under the terms of the GNU General Public License as published by the
 10  * Free Software Foundation; either version 2 of the License, or (at your
 11  * option) any later version.
 12  *
 13  * This program is distributed in the hope that it will be useful, but
 14  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 15  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 16  * for more details.
 17  *
 18  * You should have received a copy of the GNU General Public License
 19  * along with this program; if not, write to the Free Software Foundation,
 20  * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 21  */
 22 
 23 #include <linux/module.h>
 24 #include <linux/pci.h>
 25 #include <linux/dmapool.h>
 26 #include <linux/kernel.h>
 27 #include <linux/delay.h>
 28 #include <linux/ioport.h>
 29 #include <linux/sched.h>
 30 #include <linux/vmalloc.h>
 31 #include <linux/errno.h>
 32 #include <linux/init.h>
 33 #include <linux/hrtimer.h>
 34 #include <linux/list.h>
 35 #include <linux/interrupt.h>
 36 #include <linux/usb.h>
 37 #include <linux/usb/hcd.h>
 38 #include <linux/moduleparam.h>
 39 #include <linux/dma-mapping.h>
 40 #include <linux/debugfs.h>
 41 #include <linux/slab.h>
 42 
 43 #include <asm/byteorder.h>
 44 #include <asm/io.h>
 45 #include <asm/irq.h>
 46 #include <asm/unaligned.h>
 47 
 48 #if defined(CONFIG_PPC_PS3)
 49 #include <asm/firmware.h>
 50 #endif
 51 
 52 /*-------------------------------------------------------------------------*/
 53 
 54 /*
 55  * EHCI hc_driver implementation ... experimental, incomplete.
 56  * Based on the final 1.0 register interface specification.
 57  *
 58  * USB 2.0 shows up in upcoming www.pcmcia.org technology.
 59  * First was PCMCIA, like ISA; then CardBus, which is PCI.
 60  * Next comes "CardBay", using USB 2.0 signals.
 61  *
 62  * Contains additional contributions by Brad Hards, Rory Bolt, and others.
 63  * Special thanks to Intel and VIA for providing host controllers to
 64  * test this driver on, and Cypress (including In-System Design) for
 65  * providing early devices for those host controllers to talk to!
 66  */
 67 
 68 #define DRIVER_AUTHOR "David Brownell"
 69 #define DRIVER_DESC "USB 2.0 'Enhanced' Host Controller (EHCI) Driver"
 70 
 71 static const char       hcd_name [] = "ehci_hcd";
 72 
 73 
 74 #undef EHCI_URB_TRACE
 75 
 76 /* magic numbers that can affect system performance */
 77 #define EHCI_TUNE_CERR          3       /* 0-3 qtd retries; 0 == don't stop */
 78 #define EHCI_TUNE_RL_HS         4       /* nak throttle; see 4.9 */
 79 #define EHCI_TUNE_RL_TT         0
 80 #define EHCI_TUNE_MULT_HS       1       /* 1-3 transactions/uframe; 4.10.3 */
 81 #define EHCI_TUNE_MULT_TT       1
 82 /*
 83  * Some drivers think it's safe to schedule isochronous transfers more than
 84  * 256 ms into the future (partly as a result of an old bug in the scheduling
 85  * code).  In an attempt to avoid trouble, we will use a minimum scheduling
 86  * length of 512 frames instead of 256.
 87  */
 88 #define EHCI_TUNE_FLS           1       /* (medium) 512-frame schedule */
 89 
 90 /* Initial IRQ latency:  faster than hw default */
 91 static int log2_irq_thresh = 0;         // 0 to 6
 92 module_param (log2_irq_thresh, int, S_IRUGO);
 93 MODULE_PARM_DESC (log2_irq_thresh, "log2 IRQ latency, 1-64 microframes");
 94 
 95 /* initial park setting:  slower than hw default */
 96 static unsigned park = 0;
 97 module_param (park, uint, S_IRUGO);
 98 MODULE_PARM_DESC (park, "park setting; 1-3 back-to-back async packets");
 99 
100 /* for flakey hardware, ignore overcurrent indicators */
101 static bool ignore_oc = 0;
102 module_param (ignore_oc, bool, S_IRUGO);
103 MODULE_PARM_DESC (ignore_oc, "ignore bogus hardware overcurrent indications");
104 
105 #define INTR_MASK (STS_IAA | STS_FATAL | STS_PCD | STS_ERR | STS_INT)
106 
107 /*-------------------------------------------------------------------------*/
108 
109 #include "ehci.h"
110 #include "pci-quirks.h"
111 
112 static void compute_tt_budget(u8 budget_table[EHCI_BANDWIDTH_SIZE],
113                 struct ehci_tt *tt);
114 
115 /*
116  * The MosChip MCS9990 controller updates its microframe counter
117  * a little before the frame counter, and occasionally we will read
118  * the invalid intermediate value.  Avoid problems by checking the
119  * microframe number (the low-order 3 bits); if they are 0 then
120  * re-read the register to get the correct value.
121  */
122 static unsigned ehci_moschip_read_frame_index(struct ehci_hcd *ehci)
123 {
124         unsigned uf;
125 
126         uf = ehci_readl(ehci, &ehci->regs->frame_index);
127         if (unlikely((uf & 7) == 0))
128                 uf = ehci_readl(ehci, &ehci->regs->frame_index);
129         return uf;
130 }
131 
132 static inline unsigned ehci_read_frame_index(struct ehci_hcd *ehci)
133 {
134         if (ehci->frame_index_bug)
135                 return ehci_moschip_read_frame_index(ehci);
136         return ehci_readl(ehci, &ehci->regs->frame_index);
137 }
138 
139 #include "ehci-dbg.c"
140 
141 /*-------------------------------------------------------------------------*/
142 
143 /*
144  * ehci_handshake - spin reading hc until handshake completes or fails
145  * @ptr: address of hc register to be read
146  * @mask: bits to look at in result of read
147  * @done: value of those bits when handshake succeeds
148  * @usec: timeout in microseconds
149  *
150  * Returns negative errno, or zero on success
151  *
152  * Success happens when the "mask" bits have the specified value (hardware
153  * handshake done).  There are two failure modes:  "usec" have passed (major
154  * hardware flakeout), or the register reads as all-ones (hardware removed).
155  *
156  * That last failure should_only happen in cases like physical cardbus eject
157  * before driver shutdown. But it also seems to be caused by bugs in cardbus
158  * bridge shutdown:  shutting down the bridge before the devices using it.
159  */
160 int ehci_handshake(struct ehci_hcd *ehci, void __iomem *ptr,
161                    u32 mask, u32 done, int usec)
162 {
163         u32     result;
164 
165         do {
166                 result = ehci_readl(ehci, ptr);
167                 if (result == ~(u32)0)          /* card removed */
168                         return -ENODEV;
169                 result &= mask;
170                 if (result == done)
171                         return 0;
172                 udelay (1);
173                 usec--;
174         } while (usec > 0);
175         return -ETIMEDOUT;
176 }
177 EXPORT_SYMBOL_GPL(ehci_handshake);
178 
179 /* check TDI/ARC silicon is in host mode */
180 static int tdi_in_host_mode (struct ehci_hcd *ehci)
181 {
182         u32             tmp;
183 
184         tmp = ehci_readl(ehci, &ehci->regs->usbmode);
185         return (tmp & 3) == USBMODE_CM_HC;
186 }
187 
188 /*
189  * Force HC to halt state from unknown (EHCI spec section 2.3).
190  * Must be called with interrupts enabled and the lock not held.
191  */
192 static int ehci_halt (struct ehci_hcd *ehci)
193 {
194         u32     temp;
195 
196         spin_lock_irq(&ehci->lock);
197 
198         /* disable any irqs left enabled by previous code */
199         ehci_writel(ehci, 0, &ehci->regs->intr_enable);
200 
201         if (ehci_is_TDI(ehci) && !tdi_in_host_mode(ehci)) {
202                 spin_unlock_irq(&ehci->lock);
203                 return 0;
204         }
205 
206         /*
207          * This routine gets called during probe before ehci->command
208          * has been initialized, so we can't rely on its value.
209          */
210         ehci->command &= ~CMD_RUN;
211         temp = ehci_readl(ehci, &ehci->regs->command);
212         temp &= ~(CMD_RUN | CMD_IAAD);
213         ehci_writel(ehci, temp, &ehci->regs->command);
214 
215         spin_unlock_irq(&ehci->lock);
216         synchronize_irq(ehci_to_hcd(ehci)->irq);
217 
218         return ehci_handshake(ehci, &ehci->regs->status,
219                           STS_HALT, STS_HALT, 16 * 125);
220 }
221 
222 /* put TDI/ARC silicon into EHCI mode */
223 static void tdi_reset (struct ehci_hcd *ehci)
224 {
225         u32             tmp;
226 
227         tmp = ehci_readl(ehci, &ehci->regs->usbmode);
228         tmp |= USBMODE_CM_HC;
229         /* The default byte access to MMR space is LE after
230          * controller reset. Set the required endian mode
231          * for transfer buffers to match the host microprocessor
232          */
233         if (ehci_big_endian_mmio(ehci))
234                 tmp |= USBMODE_BE;
235         ehci_writel(ehci, tmp, &ehci->regs->usbmode);
236 }
237 
238 /*
239  * Reset a non-running (STS_HALT == 1) controller.
240  * Must be called with interrupts enabled and the lock not held.
241  */
242 static int ehci_reset (struct ehci_hcd *ehci)
243 {
244         int     retval;
245         u32     command = ehci_readl(ehci, &ehci->regs->command);
246 
247         /* If the EHCI debug controller is active, special care must be
248          * taken before and after a host controller reset */
249         if (ehci->debug && !dbgp_reset_prep(ehci_to_hcd(ehci)))
250                 ehci->debug = NULL;
251 
252         command |= CMD_RESET;
253         dbg_cmd (ehci, "reset", command);
254         ehci_writel(ehci, command, &ehci->regs->command);
255         ehci->rh_state = EHCI_RH_HALTED;
256         ehci->next_statechange = jiffies;
257         retval = ehci_handshake(ehci, &ehci->regs->command,
258                             CMD_RESET, 0, 250 * 1000);
259 
260         if (ehci->has_hostpc) {
261                 ehci_writel(ehci, USBMODE_EX_HC | USBMODE_EX_VBPS,
262                                 &ehci->regs->usbmode_ex);
263                 ehci_writel(ehci, TXFIFO_DEFAULT, &ehci->regs->txfill_tuning);
264         }
265         if (retval)
266                 return retval;
267 
268         if (ehci_is_TDI(ehci))
269                 tdi_reset (ehci);
270 
271         if (ehci->debug)
272                 dbgp_external_startup(ehci_to_hcd(ehci));
273 
274         ehci->port_c_suspend = ehci->suspended_ports =
275                         ehci->resuming_ports = 0;
276         return retval;
277 }
278 
279 /*
280  * Idle the controller (turn off the schedules).
281  * Must be called with interrupts enabled and the lock not held.
282  */
283 static void ehci_quiesce (struct ehci_hcd *ehci)
284 {
285         u32     temp;
286 
287         if (ehci->rh_state != EHCI_RH_RUNNING)
288                 return;
289 
290         /* wait for any schedule enables/disables to take effect */
291         temp = (ehci->command << 10) & (STS_ASS | STS_PSS);
292         ehci_handshake(ehci, &ehci->regs->status, STS_ASS | STS_PSS, temp,
293                         16 * 125);
294 
295         /* then disable anything that's still active */
296         spin_lock_irq(&ehci->lock);
297         ehci->command &= ~(CMD_ASE | CMD_PSE);
298         ehci_writel(ehci, ehci->command, &ehci->regs->command);
299         spin_unlock_irq(&ehci->lock);
300 
301         /* hardware can take 16 microframes to turn off ... */
302         ehci_handshake(ehci, &ehci->regs->status, STS_ASS | STS_PSS, 0,
303                         16 * 125);
304 }
305 
306 /*-------------------------------------------------------------------------*/
307 
308 static void end_unlink_async(struct ehci_hcd *ehci);
309 static void unlink_empty_async(struct ehci_hcd *ehci);
310 static void unlink_empty_async_suspended(struct ehci_hcd *ehci);
311 static void ehci_work(struct ehci_hcd *ehci);
312 static void start_unlink_intr(struct ehci_hcd *ehci, struct ehci_qh *qh);
313 static void end_unlink_intr(struct ehci_hcd *ehci, struct ehci_qh *qh);
314 static int ehci_port_power(struct ehci_hcd *ehci, int portnum, bool enable);
315 
316 #include "ehci-timer.c"
317 #include "ehci-hub.c"
318 #include "ehci-mem.c"
319 #include "ehci-q.c"
320 #include "ehci-sched.c"
321 #include "ehci-sysfs.c"
322 
323 /*-------------------------------------------------------------------------*/
324 
325 /* On some systems, leaving remote wakeup enabled prevents system shutdown.
326  * The firmware seems to think that powering off is a wakeup event!
327  * This routine turns off remote wakeup and everything else, on all ports.
328  */
329 static void ehci_turn_off_all_ports(struct ehci_hcd *ehci)
330 {
331         int     port = HCS_N_PORTS(ehci->hcs_params);
332 
333         while (port--) {
334                 ehci_writel(ehci, PORT_RWC_BITS,
335                                 &ehci->regs->port_status[port]);
336                 spin_unlock_irq(&ehci->lock);
337                 ehci_port_power(ehci, port, false);
338                 spin_lock_irq(&ehci->lock);
339         }
340 }
341 
342 /*
343  * Halt HC, turn off all ports, and let the BIOS use the companion controllers.
344  * Must be called with interrupts enabled and the lock not held.
345  */
346 static void ehci_silence_controller(struct ehci_hcd *ehci)
347 {
348         ehci_halt(ehci);
349 
350         spin_lock_irq(&ehci->lock);
351         ehci->rh_state = EHCI_RH_HALTED;
352         ehci_turn_off_all_ports(ehci);
353 
354         /* make BIOS/etc use companion controller during reboot */
355         ehci_writel(ehci, 0, &ehci->regs->configured_flag);
356 
357         /* unblock posted writes */
358         ehci_readl(ehci, &ehci->regs->configured_flag);
359         spin_unlock_irq(&ehci->lock);
360 }
361 
362 /* ehci_shutdown kick in for silicon on any bus (not just pci, etc).
363  * This forcibly disables dma and IRQs, helping kexec and other cases
364  * where the next system software may expect clean state.
365  */
366 static void ehci_shutdown(struct usb_hcd *hcd)
367 {
368         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
369 
370         spin_lock_irq(&ehci->lock);
371         ehci->shutdown = true;
372         ehci->rh_state = EHCI_RH_STOPPING;
373         ehci->enabled_hrtimer_events = 0;
374         spin_unlock_irq(&ehci->lock);
375 
376         ehci_silence_controller(ehci);
377 
378         hrtimer_cancel(&ehci->hrtimer);
379 }
380 
381 /*-------------------------------------------------------------------------*/
382 
383 /*
384  * ehci_work is called from some interrupts, timers, and so on.
385  * it calls driver completion functions, after dropping ehci->lock.
386  */
387 static void ehci_work (struct ehci_hcd *ehci)
388 {
389         /* another CPU may drop ehci->lock during a schedule scan while
390          * it reports urb completions.  this flag guards against bogus
391          * attempts at re-entrant schedule scanning.
392          */
393         if (ehci->scanning) {
394                 ehci->need_rescan = true;
395                 return;
396         }
397         ehci->scanning = true;
398 
399  rescan:
400         ehci->need_rescan = false;
401         if (ehci->async_count)
402                 scan_async(ehci);
403         if (ehci->intr_count > 0)
404                 scan_intr(ehci);
405         if (ehci->isoc_count > 0)
406                 scan_isoc(ehci);
407         if (ehci->need_rescan)
408                 goto rescan;
409         ehci->scanning = false;
410 
411         /* the IO watchdog guards against hardware or driver bugs that
412          * misplace IRQs, and should let us run completely without IRQs.
413          * such lossage has been observed on both VT6202 and VT8235.
414          */
415         turn_on_io_watchdog(ehci);
416 }
417 
418 /*
419  * Called when the ehci_hcd module is removed.
420  */
421 static void ehci_stop (struct usb_hcd *hcd)
422 {
423         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
424 
425         ehci_dbg (ehci, "stop\n");
426 
427         /* no more interrupts ... */
428 
429         spin_lock_irq(&ehci->lock);
430         ehci->enabled_hrtimer_events = 0;
431         spin_unlock_irq(&ehci->lock);
432 
433         ehci_quiesce(ehci);
434         ehci_silence_controller(ehci);
435         ehci_reset (ehci);
436 
437         hrtimer_cancel(&ehci->hrtimer);
438         remove_sysfs_files(ehci);
439         remove_debug_files (ehci);
440 
441         /* root hub is shut down separately (first, when possible) */
442         spin_lock_irq (&ehci->lock);
443         end_free_itds(ehci);
444         spin_unlock_irq (&ehci->lock);
445         ehci_mem_cleanup (ehci);
446 
447         if (ehci->amd_pll_fix == 1)
448                 usb_amd_dev_put();
449 
450         dbg_status (ehci, "ehci_stop completed",
451                     ehci_readl(ehci, &ehci->regs->status));
452 }
453 
454 /* one-time init, only for memory state */
455 static int ehci_init(struct usb_hcd *hcd)
456 {
457         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
458         u32                     temp;
459         int                     retval;
460         u32                     hcc_params;
461         struct ehci_qh_hw       *hw;
462 
463         spin_lock_init(&ehci->lock);
464 
465         /*
466          * keep io watchdog by default, those good HCDs could turn off it later
467          */
468         ehci->need_io_watchdog = 1;
469 
470         hrtimer_init(&ehci->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
471         ehci->hrtimer.function = ehci_hrtimer_func;
472         ehci->next_hrtimer_event = EHCI_HRTIMER_NO_EVENT;
473 
474         hcc_params = ehci_readl(ehci, &ehci->caps->hcc_params);
475 
476         /*
477          * by default set standard 80% (== 100 usec/uframe) max periodic
478          * bandwidth as required by USB 2.0
479          */
480         ehci->uframe_periodic_max = 100;
481 
482         /*
483          * hw default: 1K periodic list heads, one per frame.
484          * periodic_size can shrink by USBCMD update if hcc_params allows.
485          */
486         ehci->periodic_size = DEFAULT_I_TDPS;
487         INIT_LIST_HEAD(&ehci->async_unlink);
488         INIT_LIST_HEAD(&ehci->async_idle);
489         INIT_LIST_HEAD(&ehci->intr_unlink_wait);
490         INIT_LIST_HEAD(&ehci->intr_unlink);
491         INIT_LIST_HEAD(&ehci->intr_qh_list);
492         INIT_LIST_HEAD(&ehci->cached_itd_list);
493         INIT_LIST_HEAD(&ehci->cached_sitd_list);
494         INIT_LIST_HEAD(&ehci->tt_list);
495 
496         if (HCC_PGM_FRAMELISTLEN(hcc_params)) {
497                 /* periodic schedule size can be smaller than default */
498                 switch (EHCI_TUNE_FLS) {
499                 case 0: ehci->periodic_size = 1024; break;
500                 case 1: ehci->periodic_size = 512; break;
501                 case 2: ehci->periodic_size = 256; break;
502                 default:        BUG();
503                 }
504         }
505         if ((retval = ehci_mem_init(ehci, GFP_KERNEL)) < 0)
506                 return retval;
507 
508         /* controllers may cache some of the periodic schedule ... */
509         if (HCC_ISOC_CACHE(hcc_params))         // full frame cache
510                 ehci->i_thresh = 0;
511         else                                    // N microframes cached
512                 ehci->i_thresh = 2 + HCC_ISOC_THRES(hcc_params);
513 
514         /*
515          * dedicate a qh for the async ring head, since we couldn't unlink
516          * a 'real' qh without stopping the async schedule [4.8].  use it
517          * as the 'reclamation list head' too.
518          * its dummy is used in hw_alt_next of many tds, to prevent the qh
519          * from automatically advancing to the next td after short reads.
520          */
521         ehci->async->qh_next.qh = NULL;
522         hw = ehci->async->hw;
523         hw->hw_next = QH_NEXT(ehci, ehci->async->qh_dma);
524         hw->hw_info1 = cpu_to_hc32(ehci, QH_HEAD);
525 #if defined(CONFIG_PPC_PS3)
526         hw->hw_info1 |= cpu_to_hc32(ehci, QH_INACTIVATE);
527 #endif
528         hw->hw_token = cpu_to_hc32(ehci, QTD_STS_HALT);
529         hw->hw_qtd_next = EHCI_LIST_END(ehci);
530         ehci->async->qh_state = QH_STATE_LINKED;
531         hw->hw_alt_next = QTD_NEXT(ehci, ehci->async->dummy->qtd_dma);
532 
533         /* clear interrupt enables, set irq latency */
534         if (log2_irq_thresh < 0 || log2_irq_thresh > 6)
535                 log2_irq_thresh = 0;
536         temp = 1 << (16 + log2_irq_thresh);
537         if (HCC_PER_PORT_CHANGE_EVENT(hcc_params)) {
538                 ehci->has_ppcd = 1;
539                 ehci_dbg(ehci, "enable per-port change event\n");
540                 temp |= CMD_PPCEE;
541         }
542         if (HCC_CANPARK(hcc_params)) {
543                 /* HW default park == 3, on hardware that supports it (like
544                  * NVidia and ALI silicon), maximizes throughput on the async
545                  * schedule by avoiding QH fetches between transfers.
546                  *
547                  * With fast usb storage devices and NForce2, "park" seems to
548                  * make problems:  throughput reduction (!), data errors...
549                  */
550                 if (park) {
551                         park = min(park, (unsigned) 3);
552                         temp |= CMD_PARK;
553                         temp |= park << 8;
554                 }
555                 ehci_dbg(ehci, "park %d\n", park);
556         }
557         if (HCC_PGM_FRAMELISTLEN(hcc_params)) {
558                 /* periodic schedule size can be smaller than default */
559                 temp &= ~(3 << 2);
560                 temp |= (EHCI_TUNE_FLS << 2);
561         }
562         ehci->command = temp;
563 
564         /* Accept arbitrarily long scatter-gather lists */
565         if (!(hcd->driver->flags & HCD_LOCAL_MEM))
566                 hcd->self.sg_tablesize = ~0;
567         return 0;
568 }
569 
570 /* start HC running; it's halted, ehci_init() has been run (once) */
571 static int ehci_run (struct usb_hcd *hcd)
572 {
573         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
574         u32                     temp;
575         u32                     hcc_params;
576 
577         hcd->uses_new_polling = 1;
578 
579         /* EHCI spec section 4.1 */
580 
581         ehci_writel(ehci, ehci->periodic_dma, &ehci->regs->frame_list);
582         ehci_writel(ehci, (u32)ehci->async->qh_dma, &ehci->regs->async_next);
583 
584         /*
585          * hcc_params controls whether ehci->regs->segment must (!!!)
586          * be used; it constrains QH/ITD/SITD and QTD locations.
587          * pci_pool consistent memory always uses segment zero.
588          * streaming mappings for I/O buffers, like pci_map_single(),
589          * can return segments above 4GB, if the device allows.
590          *
591          * NOTE:  the dma mask is visible through dma_supported(), so
592          * drivers can pass this info along ... like NETIF_F_HIGHDMA,
593          * Scsi_Host.highmem_io, and so forth.  It's readonly to all
594          * host side drivers though.
595          */
596         hcc_params = ehci_readl(ehci, &ehci->caps->hcc_params);
597         if (HCC_64BIT_ADDR(hcc_params)) {
598                 ehci_writel(ehci, 0, &ehci->regs->segment);
599 #if 0
600 // this is deeply broken on almost all architectures
601                 if (!dma_set_mask(hcd->self.controller, DMA_BIT_MASK(64)))
602                         ehci_info(ehci, "enabled 64bit DMA\n");
603 #endif
604         }
605 
606 
607         // Philips, Intel, and maybe others need CMD_RUN before the
608         // root hub will detect new devices (why?); NEC doesn't
609         ehci->command &= ~(CMD_LRESET|CMD_IAAD|CMD_PSE|CMD_ASE|CMD_RESET);
610         ehci->command |= CMD_RUN;
611         ehci_writel(ehci, ehci->command, &ehci->regs->command);
612         dbg_cmd (ehci, "init", ehci->command);
613 
614         /*
615          * Start, enabling full USB 2.0 functionality ... usb 1.1 devices
616          * are explicitly handed to companion controller(s), so no TT is
617          * involved with the root hub.  (Except where one is integrated,
618          * and there's no companion controller unless maybe for USB OTG.)
619          *
620          * Turning on the CF flag will transfer ownership of all ports
621          * from the companions to the EHCI controller.  If any of the
622          * companions are in the middle of a port reset at the time, it
623          * could cause trouble.  Write-locking ehci_cf_port_reset_rwsem
624          * guarantees that no resets are in progress.  After we set CF,
625          * a short delay lets the hardware catch up; new resets shouldn't
626          * be started before the port switching actions could complete.
627          */
628         down_write(&ehci_cf_port_reset_rwsem);
629         ehci->rh_state = EHCI_RH_RUNNING;
630         ehci_writel(ehci, FLAG_CF, &ehci->regs->configured_flag);
631         ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
632         msleep(5);
633         up_write(&ehci_cf_port_reset_rwsem);
634         ehci->last_periodic_enable = ktime_get_real();
635 
636         temp = HC_VERSION(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase));
637         ehci_info (ehci,
638                 "USB %x.%x started, EHCI %x.%02x%s\n",
639                 ((ehci->sbrn & 0xf0)>>4), (ehci->sbrn & 0x0f),
640                 temp >> 8, temp & 0xff,
641                 ignore_oc ? ", overcurrent ignored" : "");
642 
643         ehci_writel(ehci, INTR_MASK,
644                     &ehci->regs->intr_enable); /* Turn On Interrupts */
645 
646         /* GRR this is run-once init(), being done every time the HC starts.
647          * So long as they're part of class devices, we can't do it init()
648          * since the class device isn't created that early.
649          */
650         create_debug_files(ehci);
651         create_sysfs_files(ehci);
652 
653         return 0;
654 }
655 
656 int ehci_setup(struct usb_hcd *hcd)
657 {
658         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
659         int retval;
660 
661         ehci->regs = (void __iomem *)ehci->caps +
662             HC_LENGTH(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase));
663         dbg_hcs_params(ehci, "reset");
664         dbg_hcc_params(ehci, "reset");
665 
666         /* cache this readonly data; minimize chip reads */
667         ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
668 
669         ehci->sbrn = HCD_USB2;
670 
671         /* data structure init */
672         retval = ehci_init(hcd);
673         if (retval)
674                 return retval;
675 
676         retval = ehci_halt(ehci);
677         if (retval)
678                 return retval;
679 
680         ehci_reset(ehci);
681 
682         return 0;
683 }
684 EXPORT_SYMBOL_GPL(ehci_setup);
685 
686 /*-------------------------------------------------------------------------*/
687 
688 static irqreturn_t ehci_irq (struct usb_hcd *hcd)
689 {
690         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
691         u32                     status, masked_status, pcd_status = 0, cmd;
692         int                     bh;
693         unsigned long           flags;
694 
695         /*
696          * For threadirqs option we use spin_lock_irqsave() variant to prevent
697          * deadlock with ehci hrtimer callback, because hrtimer callbacks run
698          * in interrupt context even when threadirqs is specified. We can go
699          * back to spin_lock() variant when hrtimer callbacks become threaded.
700          */
701         spin_lock_irqsave(&ehci->lock, flags);
702 
703         status = ehci_readl(ehci, &ehci->regs->status);
704 
705         /* e.g. cardbus physical eject */
706         if (status == ~(u32) 0) {
707                 ehci_dbg (ehci, "device removed\n");
708                 goto dead;
709         }
710 
711         /*
712          * We don't use STS_FLR, but some controllers don't like it to
713          * remain on, so mask it out along with the other status bits.
714          */
715         masked_status = status & (INTR_MASK | STS_FLR);
716 
717         /* Shared IRQ? */
718         if (!masked_status || unlikely(ehci->rh_state == EHCI_RH_HALTED)) {
719                 spin_unlock_irqrestore(&ehci->lock, flags);
720                 return IRQ_NONE;
721         }
722 
723         /* clear (just) interrupts */
724         ehci_writel(ehci, masked_status, &ehci->regs->status);
725         cmd = ehci_readl(ehci, &ehci->regs->command);
726         bh = 0;
727 
728         /* normal [4.15.1.2] or error [4.15.1.1] completion */
729         if (likely ((status & (STS_INT|STS_ERR)) != 0)) {
730                 if (likely ((status & STS_ERR) == 0))
731                         COUNT (ehci->stats.normal);
732                 else
733                         COUNT (ehci->stats.error);
734                 bh = 1;
735         }
736 
737         /* complete the unlinking of some qh [4.15.2.3] */
738         if (status & STS_IAA) {
739 
740                 /* Turn off the IAA watchdog */
741                 ehci->enabled_hrtimer_events &= ~BIT(EHCI_HRTIMER_IAA_WATCHDOG);
742 
743                 /*
744                  * Mild optimization: Allow another IAAD to reset the
745                  * hrtimer, if one occurs before the next expiration.
746                  * In theory we could always cancel the hrtimer, but
747                  * tests show that about half the time it will be reset
748                  * for some other event anyway.
749                  */
750                 if (ehci->next_hrtimer_event == EHCI_HRTIMER_IAA_WATCHDOG)
751                         ++ehci->next_hrtimer_event;
752 
753                 /* guard against (alleged) silicon errata */
754                 if (cmd & CMD_IAAD)
755                         ehci_dbg(ehci, "IAA with IAAD still set?\n");
756                 if (ehci->iaa_in_progress)
757                         COUNT(ehci->stats.iaa);
758                 end_unlink_async(ehci);
759         }
760 
761         /* remote wakeup [4.3.1] */
762         if (status & STS_PCD) {
763                 unsigned        i = HCS_N_PORTS (ehci->hcs_params);
764                 u32             ppcd = ~0;
765 
766                 /* kick root hub later */
767                 pcd_status = status;
768 
769                 /* resume root hub? */
770                 if (ehci->rh_state == EHCI_RH_SUSPENDED)
771                         usb_hcd_resume_root_hub(hcd);
772 
773                 /* get per-port change detect bits */
774                 if (ehci->has_ppcd)
775                         ppcd = status >> 16;
776 
777                 while (i--) {
778                         int pstatus;
779 
780                         /* leverage per-port change bits feature */
781                         if (!(ppcd & (1 << i)))
782                                 continue;
783                         pstatus = ehci_readl(ehci,
784                                          &ehci->regs->port_status[i]);
785 
786                         if (pstatus & PORT_OWNER)
787                                 continue;
788                         if (!(test_bit(i, &ehci->suspended_ports) &&
789                                         ((pstatus & PORT_RESUME) ||
790                                                 !(pstatus & PORT_SUSPEND)) &&
791                                         (pstatus & PORT_PE) &&
792                                         ehci->reset_done[i] == 0))
793                                 continue;
794 
795                         /* start 20 msec resume signaling from this port,
796                          * and make hub_wq collect PORT_STAT_C_SUSPEND to
797                          * stop that signaling.  Use 5 ms extra for safety,
798                          * like usb_port_resume() does.
799                          */
800                         ehci->reset_done[i] = jiffies + msecs_to_jiffies(25);
801                         set_bit(i, &ehci->resuming_ports);
802                         ehci_dbg (ehci, "port %d remote wakeup\n", i + 1);
803                         usb_hcd_start_port_resume(&hcd->self, i);
804                         mod_timer(&hcd->rh_timer, ehci->reset_done[i]);
805                 }
806         }
807 
808         /* PCI errors [4.15.2.4] */
809         if (unlikely ((status & STS_FATAL) != 0)) {
810                 ehci_err(ehci, "fatal error\n");
811                 dbg_cmd(ehci, "fatal", cmd);
812                 dbg_status(ehci, "fatal", status);
813 dead:
814                 usb_hc_died(hcd);
815 
816                 /* Don't let the controller do anything more */
817                 ehci->shutdown = true;
818                 ehci->rh_state = EHCI_RH_STOPPING;
819                 ehci->command &= ~(CMD_RUN | CMD_ASE | CMD_PSE);
820                 ehci_writel(ehci, ehci->command, &ehci->regs->command);
821                 ehci_writel(ehci, 0, &ehci->regs->intr_enable);
822                 ehci_handle_controller_death(ehci);
823 
824                 /* Handle completions when the controller stops */
825                 bh = 0;
826         }
827 
828         if (bh)
829                 ehci_work (ehci);
830         spin_unlock_irqrestore(&ehci->lock, flags);
831         if (pcd_status)
832                 usb_hcd_poll_rh_status(hcd);
833         return IRQ_HANDLED;
834 }
835 
836 /*-------------------------------------------------------------------------*/
837 
838 /*
839  * non-error returns are a promise to giveback() the urb later
840  * we drop ownership so next owner (or urb unlink) can get it
841  *
842  * urb + dev is in hcd.self.controller.urb_list
843  * we're queueing TDs onto software and hardware lists
844  *
845  * hcd-specific init for hcpriv hasn't been done yet
846  *
847  * NOTE:  control, bulk, and interrupt share the same code to append TDs
848  * to a (possibly active) QH, and the same QH scanning code.
849  */
850 static int ehci_urb_enqueue (
851         struct usb_hcd  *hcd,
852         struct urb      *urb,
853         gfp_t           mem_flags
854 ) {
855         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
856         struct list_head        qtd_list;
857 
858         INIT_LIST_HEAD (&qtd_list);
859 
860         switch (usb_pipetype (urb->pipe)) {
861         case PIPE_CONTROL:
862                 /* qh_completions() code doesn't handle all the fault cases
863                  * in multi-TD control transfers.  Even 1KB is rare anyway.
864                  */
865                 if (urb->transfer_buffer_length > (16 * 1024))
866                         return -EMSGSIZE;
867                 /* FALLTHROUGH */
868         /* case PIPE_BULK: */
869         default:
870                 if (!qh_urb_transaction (ehci, urb, &qtd_list, mem_flags))
871                         return -ENOMEM;
872                 return submit_async(ehci, urb, &qtd_list, mem_flags);
873 
874         case PIPE_INTERRUPT:
875                 if (!qh_urb_transaction (ehci, urb, &qtd_list, mem_flags))
876                         return -ENOMEM;
877                 return intr_submit(ehci, urb, &qtd_list, mem_flags);
878 
879         case PIPE_ISOCHRONOUS:
880                 if (urb->dev->speed == USB_SPEED_HIGH)
881                         return itd_submit (ehci, urb, mem_flags);
882                 else
883                         return sitd_submit (ehci, urb, mem_flags);
884         }
885 }
886 
887 /* remove from hardware lists
888  * completions normally happen asynchronously
889  */
890 
891 static int ehci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
892 {
893         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
894         struct ehci_qh          *qh;
895         unsigned long           flags;
896         int                     rc;
897 
898         spin_lock_irqsave (&ehci->lock, flags);
899         rc = usb_hcd_check_unlink_urb(hcd, urb, status);
900         if (rc)
901                 goto done;
902 
903         if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
904                 /*
905                  * We don't expedite dequeue for isochronous URBs.
906                  * Just wait until they complete normally or their
907                  * time slot expires.
908                  */
909         } else {
910                 qh = (struct ehci_qh *) urb->hcpriv;
911                 qh->exception = 1;
912                 switch (qh->qh_state) {
913                 case QH_STATE_LINKED:
914                         if (usb_pipetype(urb->pipe) == PIPE_INTERRUPT)
915                                 start_unlink_intr(ehci, qh);
916                         else
917                                 start_unlink_async(ehci, qh);
918                         break;
919                 case QH_STATE_COMPLETING:
920                         qh->dequeue_during_giveback = 1;
921                         break;
922                 case QH_STATE_UNLINK:
923                 case QH_STATE_UNLINK_WAIT:
924                         /* already started */
925                         break;
926                 case QH_STATE_IDLE:
927                         /* QH might be waiting for a Clear-TT-Buffer */
928                         qh_completions(ehci, qh);
929                         break;
930                 }
931         }
932 done:
933         spin_unlock_irqrestore (&ehci->lock, flags);
934         return rc;
935 }
936 
937 /*-------------------------------------------------------------------------*/
938 
939 // bulk qh holds the data toggle
940 
941 static void
942 ehci_endpoint_disable (struct usb_hcd *hcd, struct usb_host_endpoint *ep)
943 {
944         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
945         unsigned long           flags;
946         struct ehci_qh          *qh;
947 
948         /* ASSERT:  any requests/urbs are being unlinked */
949         /* ASSERT:  nobody can be submitting urbs for this any more */
950 
951 rescan:
952         spin_lock_irqsave (&ehci->lock, flags);
953         qh = ep->hcpriv;
954         if (!qh)
955                 goto done;
956 
957         /* endpoints can be iso streams.  for now, we don't
958          * accelerate iso completions ... so spin a while.
959          */
960         if (qh->hw == NULL) {
961                 struct ehci_iso_stream  *stream = ep->hcpriv;
962 
963                 if (!list_empty(&stream->td_list))
964                         goto idle_timeout;
965 
966                 /* BUG_ON(!list_empty(&stream->free_list)); */
967                 reserve_release_iso_bandwidth(ehci, stream, -1);
968                 kfree(stream);
969                 goto done;
970         }
971 
972         qh->exception = 1;
973         switch (qh->qh_state) {
974         case QH_STATE_LINKED:
975                 WARN_ON(!list_empty(&qh->qtd_list));
976                 if (usb_endpoint_type(&ep->desc) != USB_ENDPOINT_XFER_INT)
977                         start_unlink_async(ehci, qh);
978                 else
979                         start_unlink_intr(ehci, qh);
980                 /* FALL THROUGH */
981         case QH_STATE_COMPLETING:       /* already in unlinking */
982         case QH_STATE_UNLINK:           /* wait for hw to finish? */
983         case QH_STATE_UNLINK_WAIT:
984 idle_timeout:
985                 spin_unlock_irqrestore (&ehci->lock, flags);
986                 schedule_timeout_uninterruptible(1);
987                 goto rescan;
988         case QH_STATE_IDLE:             /* fully unlinked */
989                 if (qh->clearing_tt)
990                         goto idle_timeout;
991                 if (list_empty (&qh->qtd_list)) {
992                         if (qh->ps.bw_uperiod)
993                                 reserve_release_intr_bandwidth(ehci, qh, -1);
994                         qh_destroy(ehci, qh);
995                         break;
996                 }
997                 /* else FALL THROUGH */
998         default:
999                 /* caller was supposed to have unlinked any requests;
1000                  * that's not our job.  just leak this memory.
1001                  */
1002                 ehci_err (ehci, "qh %p (#%02x) state %d%s\n",
1003                         qh, ep->desc.bEndpointAddress, qh->qh_state,
1004                         list_empty (&qh->qtd_list) ? "" : "(has tds)");
1005                 break;
1006         }
1007  done:
1008         ep->hcpriv = NULL;
1009         spin_unlock_irqrestore (&ehci->lock, flags);
1010 }
1011 
1012 static void
1013 ehci_endpoint_reset(struct usb_hcd *hcd, struct usb_host_endpoint *ep)
1014 {
1015         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
1016         struct ehci_qh          *qh;
1017         int                     eptype = usb_endpoint_type(&ep->desc);
1018         int                     epnum = usb_endpoint_num(&ep->desc);
1019         int                     is_out = usb_endpoint_dir_out(&ep->desc);
1020         unsigned long           flags;
1021 
1022         if (eptype != USB_ENDPOINT_XFER_BULK && eptype != USB_ENDPOINT_XFER_INT)
1023                 return;
1024 
1025         spin_lock_irqsave(&ehci->lock, flags);
1026         qh = ep->hcpriv;
1027 
1028         /* For Bulk and Interrupt endpoints we maintain the toggle state
1029          * in the hardware; the toggle bits in udev aren't used at all.
1030          * When an endpoint is reset by usb_clear_halt() we must reset
1031          * the toggle bit in the QH.
1032          */
1033         if (qh) {
1034                 if (!list_empty(&qh->qtd_list)) {
1035                         WARN_ONCE(1, "clear_halt for a busy endpoint\n");
1036                 } else {
1037                         /* The toggle value in the QH can't be updated
1038                          * while the QH is active.  Unlink it now;
1039                          * re-linking will call qh_refresh().
1040                          */
1041                         usb_settoggle(qh->ps.udev, epnum, is_out, 0);
1042                         qh->exception = 1;
1043                         if (eptype == USB_ENDPOINT_XFER_BULK)
1044                                 start_unlink_async(ehci, qh);
1045                         else
1046                                 start_unlink_intr(ehci, qh);
1047                 }
1048         }
1049         spin_unlock_irqrestore(&ehci->lock, flags);
1050 }
1051 
1052 static int ehci_get_frame (struct usb_hcd *hcd)
1053 {
1054         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
1055         return (ehci_read_frame_index(ehci) >> 3) % ehci->periodic_size;
1056 }
1057 
1058 /*-------------------------------------------------------------------------*/
1059 
1060 /* Device addition and removal */
1061 
1062 static void ehci_remove_device(struct usb_hcd *hcd, struct usb_device *udev)
1063 {
1064         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
1065 
1066         spin_lock_irq(&ehci->lock);
1067         drop_tt(udev);
1068         spin_unlock_irq(&ehci->lock);
1069 }
1070 
1071 /*-------------------------------------------------------------------------*/
1072 
1073 #ifdef  CONFIG_PM
1074 
1075 /* suspend/resume, section 4.3 */
1076 
1077 /* These routines handle the generic parts of controller suspend/resume */
1078 
1079 int ehci_suspend(struct usb_hcd *hcd, bool do_wakeup)
1080 {
1081         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
1082 
1083         if (time_before(jiffies, ehci->next_statechange))
1084                 msleep(10);
1085 
1086         /*
1087          * Root hub was already suspended.  Disable IRQ emission and
1088          * mark HW unaccessible.  The PM and USB cores make sure that
1089          * the root hub is either suspended or stopped.
1090          */
1091         ehci_prepare_ports_for_controller_suspend(ehci, do_wakeup);
1092 
1093         spin_lock_irq(&ehci->lock);
1094         ehci_writel(ehci, 0, &ehci->regs->intr_enable);
1095         (void) ehci_readl(ehci, &ehci->regs->intr_enable);
1096 
1097         clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
1098         spin_unlock_irq(&ehci->lock);
1099 
1100         synchronize_irq(hcd->irq);
1101 
1102         /* Check for race with a wakeup request */
1103         if (do_wakeup && HCD_WAKEUP_PENDING(hcd)) {
1104                 ehci_resume(hcd, false);
1105                 return -EBUSY;
1106         }
1107 
1108         return 0;
1109 }
1110 EXPORT_SYMBOL_GPL(ehci_suspend);
1111 
1112 /* Returns 0 if power was preserved, 1 if power was lost */
1113 int ehci_resume(struct usb_hcd *hcd, bool hibernated)
1114 {
1115         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
1116 
1117         if (time_before(jiffies, ehci->next_statechange))
1118                 msleep(100);
1119 
1120         /* Mark hardware accessible again as we are back to full power by now */
1121         set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
1122 
1123         if (ehci->shutdown)
1124                 return 0;               /* Controller is dead */
1125 
1126         /*
1127          * If CF is still set and we aren't resuming from hibernation
1128          * then we maintained suspend power.
1129          * Just undo the effect of ehci_suspend().
1130          */
1131         if (ehci_readl(ehci, &ehci->regs->configured_flag) == FLAG_CF &&
1132                         !hibernated) {
1133                 int     mask = INTR_MASK;
1134 
1135                 ehci_prepare_ports_for_controller_resume(ehci);
1136 
1137                 spin_lock_irq(&ehci->lock);
1138                 if (ehci->shutdown)
1139                         goto skip;
1140 
1141                 if (!hcd->self.root_hub->do_remote_wakeup)
1142                         mask &= ~STS_PCD;
1143                 ehci_writel(ehci, mask, &ehci->regs->intr_enable);
1144                 ehci_readl(ehci, &ehci->regs->intr_enable);
1145  skip:
1146                 spin_unlock_irq(&ehci->lock);
1147                 return 0;
1148         }
1149 
1150         /*
1151          * Else reset, to cope with power loss or resume from hibernation
1152          * having let the firmware kick in during reboot.
1153          */
1154         usb_root_hub_lost_power(hcd->self.root_hub);
1155         (void) ehci_halt(ehci);
1156         (void) ehci_reset(ehci);
1157 
1158         spin_lock_irq(&ehci->lock);
1159         if (ehci->shutdown)
1160                 goto skip;
1161 
1162         ehci_writel(ehci, ehci->command, &ehci->regs->command);
1163         ehci_writel(ehci, FLAG_CF, &ehci->regs->configured_flag);
1164         ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
1165 
1166         ehci->rh_state = EHCI_RH_SUSPENDED;
1167         spin_unlock_irq(&ehci->lock);
1168 
1169         return 1;
1170 }
1171 EXPORT_SYMBOL_GPL(ehci_resume);
1172 
1173 #endif
1174 
1175 /*-------------------------------------------------------------------------*/
1176 
1177 /*
1178  * Generic structure: This gets copied for platform drivers so that
1179  * individual entries can be overridden as needed.
1180  */
1181 
1182 static const struct hc_driver ehci_hc_driver = {
1183         .description =          hcd_name,
1184         .product_desc =         "EHCI Host Controller",
1185         .hcd_priv_size =        sizeof(struct ehci_hcd),
1186 
1187         /*
1188          * generic hardware linkage
1189          */
1190         .irq =                  ehci_irq,
1191         .flags =                HCD_MEMORY | HCD_USB2 | HCD_BH,
1192 
1193         /*
1194          * basic lifecycle operations
1195          */
1196         .reset =                ehci_setup,
1197         .start =                ehci_run,
1198         .stop =                 ehci_stop,
1199         .shutdown =             ehci_shutdown,
1200 
1201         /*
1202          * managing i/o requests and associated device resources
1203          */
1204         .urb_enqueue =          ehci_urb_enqueue,
1205         .urb_dequeue =          ehci_urb_dequeue,
1206         .endpoint_disable =     ehci_endpoint_disable,
1207         .endpoint_reset =       ehci_endpoint_reset,
1208         .clear_tt_buffer_complete =     ehci_clear_tt_buffer_complete,
1209 
1210         /*
1211          * scheduling support
1212          */
1213         .get_frame_number =     ehci_get_frame,
1214 
1215         /*
1216          * root hub support
1217          */
1218         .hub_status_data =      ehci_hub_status_data,
1219         .hub_control =          ehci_hub_control,
1220         .bus_suspend =          ehci_bus_suspend,
1221         .bus_resume =           ehci_bus_resume,
1222         .relinquish_port =      ehci_relinquish_port,
1223         .port_handed_over =     ehci_port_handed_over,
1224 
1225         /*
1226          * device support
1227          */
1228         .free_dev =             ehci_remove_device,
1229 };
1230 
1231 void ehci_init_driver(struct hc_driver *drv,
1232                 const struct ehci_driver_overrides *over)
1233 {
1234         /* Copy the generic table to drv and then apply the overrides */
1235         *drv = ehci_hc_driver;
1236 
1237         if (over) {
1238                 drv->hcd_priv_size += over->extra_priv_size;
1239                 if (over->reset)
1240                         drv->reset = over->reset;
1241                 if (over->port_power)
1242                         drv->port_power = over->port_power;
1243         }
1244 }
1245 EXPORT_SYMBOL_GPL(ehci_init_driver);
1246 
1247 /*-------------------------------------------------------------------------*/
1248 
1249 MODULE_DESCRIPTION(DRIVER_DESC);
1250 MODULE_AUTHOR (DRIVER_AUTHOR);
1251 MODULE_LICENSE ("GPL");
1252 
1253 #ifdef CONFIG_USB_EHCI_FSL
1254 #include "ehci-fsl.c"
1255 #define PLATFORM_DRIVER         ehci_fsl_driver
1256 #endif
1257 
1258 #ifdef CONFIG_USB_EHCI_SH
1259 #include "ehci-sh.c"
1260 #define PLATFORM_DRIVER         ehci_hcd_sh_driver
1261 #endif
1262 
1263 #ifdef CONFIG_PPC_PS3
1264 #include "ehci-ps3.c"
1265 #define PS3_SYSTEM_BUS_DRIVER   ps3_ehci_driver
1266 #endif
1267 
1268 #ifdef CONFIG_USB_EHCI_HCD_PPC_OF
1269 #include "ehci-ppc-of.c"
1270 #define OF_PLATFORM_DRIVER      ehci_hcd_ppc_of_driver
1271 #endif
1272 
1273 #ifdef CONFIG_XPS_USB_HCD_XILINX
1274 #include "ehci-xilinx-of.c"
1275 #define XILINX_OF_PLATFORM_DRIVER       ehci_hcd_xilinx_of_driver
1276 #endif
1277 
1278 #ifdef CONFIG_TILE_USB
1279 #include "ehci-tilegx.c"
1280 #define PLATFORM_DRIVER         ehci_hcd_tilegx_driver
1281 #endif
1282 
1283 #ifdef CONFIG_USB_EHCI_HCD_PMC_MSP
1284 #include "ehci-pmcmsp.c"
1285 #define PLATFORM_DRIVER         ehci_hcd_msp_driver
1286 #endif
1287 
1288 #ifdef CONFIG_SPARC_LEON
1289 #include "ehci-grlib.c"
1290 #define PLATFORM_DRIVER         ehci_grlib_driver
1291 #endif
1292 
1293 #ifdef CONFIG_USB_EHCI_MV
1294 #include "ehci-mv.c"
1295 #define        PLATFORM_DRIVER         ehci_mv_driver
1296 #endif
1297 
1298 #ifdef CONFIG_MIPS_SEAD3
1299 #include "ehci-sead3.c"
1300 #define PLATFORM_DRIVER         ehci_hcd_sead3_driver
1301 #endif
1302 
1303 static int __init ehci_hcd_init(void)
1304 {
1305         int retval = 0;
1306 
1307         if (usb_disabled())
1308                 return -ENODEV;
1309 
1310         printk(KERN_INFO "%s: " DRIVER_DESC "\n", hcd_name);
1311         set_bit(USB_EHCI_LOADED, &usb_hcds_loaded);
1312         if (test_bit(USB_UHCI_LOADED, &usb_hcds_loaded) ||
1313                         test_bit(USB_OHCI_LOADED, &usb_hcds_loaded))
1314                 printk(KERN_WARNING "Warning! ehci_hcd should always be loaded"
1315                                 " before uhci_hcd and ohci_hcd, not after\n");
1316 
1317         pr_debug("%s: block sizes: qh %Zd qtd %Zd itd %Zd sitd %Zd\n",
1318                  hcd_name,
1319                  sizeof(struct ehci_qh), sizeof(struct ehci_qtd),
1320                  sizeof(struct ehci_itd), sizeof(struct ehci_sitd));
1321 
1322 #ifdef CONFIG_DYNAMIC_DEBUG
1323         ehci_debug_root = debugfs_create_dir("ehci", usb_debug_root);
1324         if (!ehci_debug_root) {
1325                 retval = -ENOENT;
1326                 goto err_debug;
1327         }
1328 #endif
1329 
1330 #ifdef PLATFORM_DRIVER
1331         retval = platform_driver_register(&PLATFORM_DRIVER);
1332         if (retval < 0)
1333                 goto clean0;
1334 #endif
1335 
1336 #ifdef PS3_SYSTEM_BUS_DRIVER
1337         retval = ps3_ehci_driver_register(&PS3_SYSTEM_BUS_DRIVER);
1338         if (retval < 0)
1339                 goto clean2;
1340 #endif
1341 
1342 #ifdef OF_PLATFORM_DRIVER
1343         retval = platform_driver_register(&OF_PLATFORM_DRIVER);
1344         if (retval < 0)
1345                 goto clean3;
1346 #endif
1347 
1348 #ifdef XILINX_OF_PLATFORM_DRIVER
1349         retval = platform_driver_register(&XILINX_OF_PLATFORM_DRIVER);
1350         if (retval < 0)
1351                 goto clean4;
1352 #endif
1353         return retval;
1354 
1355 #ifdef XILINX_OF_PLATFORM_DRIVER
1356         /* platform_driver_unregister(&XILINX_OF_PLATFORM_DRIVER); */
1357 clean4:
1358 #endif
1359 #ifdef OF_PLATFORM_DRIVER
1360         platform_driver_unregister(&OF_PLATFORM_DRIVER);
1361 clean3:
1362 #endif
1363 #ifdef PS3_SYSTEM_BUS_DRIVER
1364         ps3_ehci_driver_unregister(&PS3_SYSTEM_BUS_DRIVER);
1365 clean2:
1366 #endif
1367 #ifdef PLATFORM_DRIVER
1368         platform_driver_unregister(&PLATFORM_DRIVER);
1369 clean0:
1370 #endif
1371 #ifdef CONFIG_DYNAMIC_DEBUG
1372         debugfs_remove(ehci_debug_root);
1373         ehci_debug_root = NULL;
1374 err_debug:
1375 #endif
1376         clear_bit(USB_EHCI_LOADED, &usb_hcds_loaded);
1377         return retval;
1378 }
1379 module_init(ehci_hcd_init);
1380 
1381 static void __exit ehci_hcd_cleanup(void)
1382 {
1383 #ifdef XILINX_OF_PLATFORM_DRIVER
1384         platform_driver_unregister(&XILINX_OF_PLATFORM_DRIVER);
1385 #endif
1386 #ifdef OF_PLATFORM_DRIVER
1387         platform_driver_unregister(&OF_PLATFORM_DRIVER);
1388 #endif
1389 #ifdef PLATFORM_DRIVER
1390         platform_driver_unregister(&PLATFORM_DRIVER);
1391 #endif
1392 #ifdef PS3_SYSTEM_BUS_DRIVER
1393         ps3_ehci_driver_unregister(&PS3_SYSTEM_BUS_DRIVER);
1394 #endif
1395 #ifdef CONFIG_DYNAMIC_DEBUG
1396         debugfs_remove(ehci_debug_root);
1397 #endif
1398         clear_bit(USB_EHCI_LOADED, &usb_hcds_loaded);
1399 }
1400 module_exit(ehci_hcd_cleanup);
1401 

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us