2 * Copyright (c) 2000-2004 by David Brownell
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License as published by the
6 * Free Software Foundation; either version 2 of the License, or (at your
7 * option) any later version.
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
11 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software Foundation,
16 * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19 #include <linux/module.h>
20 #include <linux/pci.h>
21 #include <linux/dmapool.h>
22 #include <linux/kernel.h>
23 #include <linux/delay.h>
24 #include <linux/ioport.h>
25 #include <linux/sched.h>
26 #include <linux/slab.h>
27 #include <linux/errno.h>
28 #include <linux/init.h>
29 #include <linux/timer.h>
30 #include <linux/list.h>
31 #include <linux/interrupt.h>
32 #include <linux/reboot.h>
33 #include <linux/usb.h>
34 #include <linux/moduleparam.h>
35 #include <linux/dma-mapping.h>
36 #include <linux/debugfs.h>
38 #include "../core/hcd.h"
40 #include <asm/byteorder.h>
43 #include <asm/system.h>
44 #include <asm/unaligned.h>
46 /*-------------------------------------------------------------------------*/
49 * EHCI hc_driver implementation ... experimental, incomplete.
50 * Based on the final 1.0 register interface specification.
52 * USB 2.0 shows up in upcoming www.pcmcia.org technology.
53 * First was PCMCIA, like ISA; then CardBus, which is PCI.
54 * Next comes "CardBay", using USB 2.0 signals.
56 * Contains additional contributions by Brad Hards, Rory Bolt, and others.
57 * Special thanks to Intel and VIA for providing host controllers to
58 * test this driver on, and Cypress (including In-System Design) for
59 * providing early devices for those host controllers to talk to!
63 * 2004-05-10 Root hub and PCI suspend/resume support; remote wakeup. (db)
64 * 2004-02-24 Replace pci_* with generic dma_* API calls (dsaxena@plexity.net)
65 * 2003-12-29 Rewritten high speed iso transfer support (by Michal Sojka,
66 * <sojkam@centrum.cz>, updates by DB).
68 * 2002-11-29 Correct handling for hw async_next register.
69 * 2002-08-06 Handling for bulk and interrupt transfers is mostly shared;
70 * only scheduling is different, no arbitrary limitations.
71 * 2002-07-25 Sanity check PCI reads, mostly for better cardbus support,
72 * clean up HC run state handshaking.
73 * 2002-05-24 Preliminary FS/LS interrupts, using scheduling shortcuts
74 * 2002-05-11 Clear TT errors for FS/LS ctrl/bulk. Fill in some other
75 * missing pieces: enabling 64bit dma, handoff from BIOS/SMM.
76 * 2002-05-07 Some error path cleanups to report better errors; wmb();
77 * use non-CVS version id; better iso bandwidth claim.
78 * 2002-04-19 Control/bulk/interrupt submit no longer uses giveback() on
79 * errors in submit path. Bugfixes to interrupt scheduling/processing.
80 * 2002-03-05 Initial high-speed ISO support; reduce ITD memory; shift
81 * more checking to generic hcd framework (db). Make it work with
82 * Philips EHCI; reduce PCI traffic; shorten IRQ path (Rory Bolt).
83 * 2002-01-14 Minor cleanup; version synch.
84 * 2002-01-08 Fix roothub handoff of FS/LS to companion controllers.
85 * 2002-01-04 Control/Bulk queuing behaves.
87 * 2001-12-12 Initial patch version for Linux 2.5.1 kernel.
88 * 2001-June Works with usb-storage and NEC EHCI on 2.4
91 #define DRIVER_VERSION "10 Dec 2004"
92 #define DRIVER_AUTHOR "David Brownell"
93 #define DRIVER_DESC "USB 2.0 'Enhanced' Host Controller (EHCI) Driver"
95 static const char hcd_name [] = "ehci_hcd";
98 #undef EHCI_VERBOSE_DEBUG
105 /* magic numbers that can affect system performance */
106 #define EHCI_TUNE_CERR 3 /* 0-3 qtd retries; 0 == don't stop */
107 #define EHCI_TUNE_RL_HS 4 /* nak throttle; see 4.9 */
108 #define EHCI_TUNE_RL_TT 0
109 #define EHCI_TUNE_MULT_HS 1 /* 1-3 transactions/uframe; 4.10.3 */
110 #define EHCI_TUNE_MULT_TT 1
111 #define EHCI_TUNE_FLS 2 /* (small) 256 frame schedule */
113 #define EHCI_IAA_JIFFIES (HZ/100) /* arbitrary; ~10 msec */
114 #define EHCI_IO_JIFFIES (HZ/10) /* io watchdog > irq_thresh */
115 #define EHCI_ASYNC_JIFFIES (HZ/20) /* async idle timeout */
116 #define EHCI_SHRINK_JIFFIES (HZ/200) /* async qh unlink delay */
118 /* Initial IRQ latency: faster than hw default */
119 static int log2_irq_thresh = 0; // 0 to 6
120 module_param (log2_irq_thresh, int, S_IRUGO);
121 MODULE_PARM_DESC (log2_irq_thresh, "log2 IRQ latency, 1-64 microframes");
123 /* initial park setting: slower than hw default */
124 static unsigned park = 0;
125 module_param (park, uint, S_IRUGO);
126 MODULE_PARM_DESC (park, "park setting; 1-3 back-to-back async packets");
128 /* for flakey hardware, ignore overcurrent indicators */
129 static int ignore_oc = 0;
130 module_param (ignore_oc, bool, S_IRUGO);
131 MODULE_PARM_DESC (ignore_oc, "ignore bogus hardware overcurrent indications");
133 #define INTR_MASK (STS_IAA | STS_FATAL | STS_PCD | STS_ERR | STS_INT)
135 /*-------------------------------------------------------------------------*/
138 #include "ehci-dbg.c"
140 /*-------------------------------------------------------------------------*/
143 * handshake - spin reading hc until handshake completes or fails
144 * @ptr: address of hc register to be read
145 * @mask: bits to look at in result of read
146 * @done: value of those bits when handshake succeeds
147 * @usec: timeout in microseconds
149 * Returns negative errno, or zero on success
151 * Success happens when the "mask" bits have the specified value (hardware
152 * handshake done). There are two failure modes: "usec" have passed (major
153 * hardware flakeout), or the register reads as all-ones (hardware removed).
155 * That last failure should_only happen in cases like physical cardbus eject
156 * before driver shutdown. But it also seems to be caused by bugs in cardbus
157 * bridge shutdown: shutting down the bridge before the devices using it.
159 static int handshake (struct ehci_hcd *ehci, void __iomem *ptr,
160 u32 mask, u32 done, int usec)
165 result = ehci_readl(ehci, ptr);
166 if (result == ~(u32)0) /* card removed */
177 /* force HC to halt state from unknown (EHCI spec section 2.3) */
178 static int ehci_halt (struct ehci_hcd *ehci)
180 u32 temp = ehci_readl(ehci, &ehci->regs->status);
182 /* disable any irqs left enabled by previous code */
183 ehci_writel(ehci, 0, &ehci->regs->intr_enable);
185 if ((temp & STS_HALT) != 0)
188 temp = ehci_readl(ehci, &ehci->regs->command);
190 ehci_writel(ehci, temp, &ehci->regs->command);
191 return handshake (ehci, &ehci->regs->status,
192 STS_HALT, STS_HALT, 16 * 125);
195 /* put TDI/ARC silicon into EHCI mode */
196 static void tdi_reset (struct ehci_hcd *ehci)
198 u32 __iomem *reg_ptr;
201 reg_ptr = (u32 __iomem *)(((u8 __iomem *)ehci->regs) + USBMODE);
202 tmp = ehci_readl(ehci, reg_ptr);
203 tmp |= USBMODE_CM_HC;
204 /* The default byte access to MMR space is LE after
205 * controller reset. Set the required endian mode
206 * for transfer buffers to match the host microprocessor
208 if (ehci_big_endian_mmio(ehci))
210 ehci_writel(ehci, tmp, reg_ptr);
213 /* reset a non-running (STS_HALT == 1) controller */
214 static int ehci_reset (struct ehci_hcd *ehci)
217 u32 command = ehci_readl(ehci, &ehci->regs->command);
219 command |= CMD_RESET;
220 dbg_cmd (ehci, "reset", command);
221 ehci_writel(ehci, command, &ehci->regs->command);
222 ehci_to_hcd(ehci)->state = HC_STATE_HALT;
223 ehci->next_statechange = jiffies;
224 retval = handshake (ehci, &ehci->regs->command,
225 CMD_RESET, 0, 250 * 1000);
230 if (ehci_is_TDI(ehci))
236 /* idle the controller (from running) */
237 static void ehci_quiesce (struct ehci_hcd *ehci)
242 if (!HC_IS_RUNNING (ehci_to_hcd(ehci)->state))
246 /* wait for any schedule enables/disables to take effect */
247 temp = ehci_readl(ehci, &ehci->regs->command) << 10;
248 temp &= STS_ASS | STS_PSS;
249 if (handshake (ehci, &ehci->regs->status, STS_ASS | STS_PSS,
250 temp, 16 * 125) != 0) {
251 ehci_to_hcd(ehci)->state = HC_STATE_HALT;
255 /* then disable anything that's still active */
256 temp = ehci_readl(ehci, &ehci->regs->command);
257 temp &= ~(CMD_ASE | CMD_IAAD | CMD_PSE);
258 ehci_writel(ehci, temp, &ehci->regs->command);
260 /* hardware can take 16 microframes to turn off ... */
261 if (handshake (ehci, &ehci->regs->status, STS_ASS | STS_PSS,
263 ehci_to_hcd(ehci)->state = HC_STATE_HALT;
268 /*-------------------------------------------------------------------------*/
270 static void ehci_work(struct ehci_hcd *ehci);
272 #include "ehci-hub.c"
273 #include "ehci-mem.c"
275 #include "ehci-sched.c"
277 /*-------------------------------------------------------------------------*/
279 static void ehci_watchdog (unsigned long param)
281 struct ehci_hcd *ehci = (struct ehci_hcd *) param;
284 spin_lock_irqsave (&ehci->lock, flags);
286 /* lost IAA irqs wedge things badly; seen with a vt8235 */
288 u32 status = ehci_readl(ehci, &ehci->regs->status);
289 if (status & STS_IAA) {
290 ehci_vdbg (ehci, "lost IAA\n");
291 COUNT (ehci->stats.lost_iaa);
292 ehci_writel(ehci, STS_IAA, &ehci->regs->status);
293 ehci->reclaim_ready = 1;
297 /* stop async processing after it's idled a bit */
298 if (test_bit (TIMER_ASYNC_OFF, &ehci->actions))
299 start_unlink_async (ehci, ehci->async);
301 /* ehci could run by timer, without IRQs ... */
304 spin_unlock_irqrestore (&ehci->lock, flags);
307 /* On some systems, leaving remote wakeup enabled prevents system shutdown.
308 * The firmware seems to think that powering off is a wakeup event!
309 * This routine turns off remote wakeup and everything else, on all ports.
311 static void ehci_turn_off_all_ports(struct ehci_hcd *ehci)
313 int port = HCS_N_PORTS(ehci->hcs_params);
316 ehci_writel(ehci, PORT_RWC_BITS,
317 &ehci->regs->port_status[port]);
320 /* ehci_shutdown kick in for silicon on any bus (not just pci, etc).
321 * This forcibly disables dma and IRQs, helping kexec and other cases
322 * where the next system software may expect clean state.
325 ehci_shutdown (struct usb_hcd *hcd)
327 struct ehci_hcd *ehci;
329 ehci = hcd_to_ehci (hcd);
330 (void) ehci_halt (ehci);
331 ehci_turn_off_all_ports(ehci);
333 /* make BIOS/etc use companion controller during reboot */
334 ehci_writel(ehci, 0, &ehci->regs->configured_flag);
336 /* unblock posted writes */
337 ehci_readl(ehci, &ehci->regs->configured_flag);
340 static void ehci_port_power (struct ehci_hcd *ehci, int is_on)
344 if (!HCS_PPC (ehci->hcs_params))
347 ehci_dbg (ehci, "...power%s ports...\n", is_on ? "up" : "down");
348 for (port = HCS_N_PORTS (ehci->hcs_params); port > 0; )
349 (void) ehci_hub_control(ehci_to_hcd(ehci),
350 is_on ? SetPortFeature : ClearPortFeature,
353 /* Flush those writes */
354 ehci_readl(ehci, &ehci->regs->command);
358 /*-------------------------------------------------------------------------*/
361 * ehci_work is called from some interrupts, timers, and so on.
362 * it calls driver completion functions, after dropping ehci->lock.
364 static void ehci_work (struct ehci_hcd *ehci)
366 timer_action_done (ehci, TIMER_IO_WATCHDOG);
367 if (ehci->reclaim_ready)
368 end_unlink_async (ehci);
370 /* another CPU may drop ehci->lock during a schedule scan while
371 * it reports urb completions. this flag guards against bogus
372 * attempts at re-entrant schedule scanning.
378 if (ehci->next_uframe != -1)
379 scan_periodic (ehci);
382 /* the IO watchdog guards against hardware or driver bugs that
383 * misplace IRQs, and should let us run completely without IRQs.
384 * such lossage has been observed on both VT6202 and VT8235.
386 if (HC_IS_RUNNING (ehci_to_hcd(ehci)->state) &&
387 (ehci->async->qh_next.ptr != NULL ||
388 ehci->periodic_sched != 0))
389 timer_action (ehci, TIMER_IO_WATCHDOG);
392 static void ehci_stop (struct usb_hcd *hcd)
394 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
396 ehci_dbg (ehci, "stop\n");
398 /* Turn off port power on all root hub ports. */
399 ehci_port_power (ehci, 0);
401 /* no more interrupts ... */
402 del_timer_sync (&ehci->watchdog);
404 spin_lock_irq(&ehci->lock);
405 if (HC_IS_RUNNING (hcd->state))
409 ehci_writel(ehci, 0, &ehci->regs->intr_enable);
410 spin_unlock_irq(&ehci->lock);
412 /* let companion controllers work when we aren't */
413 ehci_writel(ehci, 0, &ehci->regs->configured_flag);
415 remove_companion_file(ehci);
416 remove_debug_files (ehci);
418 /* root hub is shut down separately (first, when possible) */
419 spin_lock_irq (&ehci->lock);
422 spin_unlock_irq (&ehci->lock);
423 ehci_mem_cleanup (ehci);
426 ehci_dbg (ehci, "irq normal %ld err %ld reclaim %ld (lost %ld)\n",
427 ehci->stats.normal, ehci->stats.error, ehci->stats.reclaim,
428 ehci->stats.lost_iaa);
429 ehci_dbg (ehci, "complete %ld unlink %ld\n",
430 ehci->stats.complete, ehci->stats.unlink);
433 dbg_status (ehci, "ehci_stop completed",
434 ehci_readl(ehci, &ehci->regs->status));
437 /* one-time init, only for memory state */
438 static int ehci_init(struct usb_hcd *hcd)
440 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
445 spin_lock_init(&ehci->lock);
447 init_timer(&ehci->watchdog);
448 ehci->watchdog.function = ehci_watchdog;
449 ehci->watchdog.data = (unsigned long) ehci;
452 * hw default: 1K periodic list heads, one per frame.
453 * periodic_size can shrink by USBCMD update if hcc_params allows.
455 ehci->periodic_size = DEFAULT_I_TDPS;
456 if ((retval = ehci_mem_init(ehci, GFP_KERNEL)) < 0)
459 /* controllers may cache some of the periodic schedule ... */
460 hcc_params = ehci_readl(ehci, &ehci->caps->hcc_params);
461 if (HCC_ISOC_CACHE(hcc_params)) // full frame cache
463 else // N microframes cached
464 ehci->i_thresh = 2 + HCC_ISOC_THRES(hcc_params);
466 ehci->reclaim = NULL;
467 ehci->reclaim_ready = 0;
468 ehci->next_uframe = -1;
471 * dedicate a qh for the async ring head, since we couldn't unlink
472 * a 'real' qh without stopping the async schedule [4.8]. use it
473 * as the 'reclamation list head' too.
474 * its dummy is used in hw_alt_next of many tds, to prevent the qh
475 * from automatically advancing to the next td after short reads.
477 ehci->async->qh_next.qh = NULL;
478 ehci->async->hw_next = QH_NEXT(ehci, ehci->async->qh_dma);
479 ehci->async->hw_info1 = cpu_to_hc32(ehci, QH_HEAD);
480 ehci->async->hw_token = cpu_to_hc32(ehci, QTD_STS_HALT);
481 ehci->async->hw_qtd_next = EHCI_LIST_END(ehci);
482 ehci->async->qh_state = QH_STATE_LINKED;
483 ehci->async->hw_alt_next = QTD_NEXT(ehci, ehci->async->dummy->qtd_dma);
485 /* clear interrupt enables, set irq latency */
486 if (log2_irq_thresh < 0 || log2_irq_thresh > 6)
488 temp = 1 << (16 + log2_irq_thresh);
489 if (HCC_CANPARK(hcc_params)) {
490 /* HW default park == 3, on hardware that supports it (like
491 * NVidia and ALI silicon), maximizes throughput on the async
492 * schedule by avoiding QH fetches between transfers.
494 * With fast usb storage devices and NForce2, "park" seems to
495 * make problems: throughput reduction (!), data errors...
498 park = min(park, (unsigned) 3);
502 ehci_dbg(ehci, "park %d\n", park);
504 if (HCC_PGM_FRAMELISTLEN(hcc_params)) {
505 /* periodic schedule size can be smaller than default */
507 temp |= (EHCI_TUNE_FLS << 2);
508 switch (EHCI_TUNE_FLS) {
509 case 0: ehci->periodic_size = 1024; break;
510 case 1: ehci->periodic_size = 512; break;
511 case 2: ehci->periodic_size = 256; break;
515 ehci->command = temp;
520 /* start HC running; it's halted, ehci_init() has been run (once) */
521 static int ehci_run (struct usb_hcd *hcd)
523 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
528 hcd->uses_new_polling = 1;
531 /* EHCI spec section 4.1 */
532 if ((retval = ehci_reset(ehci)) != 0) {
533 ehci_mem_cleanup(ehci);
536 ehci_writel(ehci, ehci->periodic_dma, &ehci->regs->frame_list);
537 ehci_writel(ehci, (u32)ehci->async->qh_dma, &ehci->regs->async_next);
540 * hcc_params controls whether ehci->regs->segment must (!!!)
541 * be used; it constrains QH/ITD/SITD and QTD locations.
542 * pci_pool consistent memory always uses segment zero.
543 * streaming mappings for I/O buffers, like pci_map_single(),
544 * can return segments above 4GB, if the device allows.
546 * NOTE: the dma mask is visible through dma_supported(), so
547 * drivers can pass this info along ... like NETIF_F_HIGHDMA,
548 * Scsi_Host.highmem_io, and so forth. It's readonly to all
549 * host side drivers though.
551 hcc_params = ehci_readl(ehci, &ehci->caps->hcc_params);
552 if (HCC_64BIT_ADDR(hcc_params)) {
553 ehci_writel(ehci, 0, &ehci->regs->segment);
555 // this is deeply broken on almost all architectures
556 if (!dma_set_mask(hcd->self.controller, DMA_64BIT_MASK))
557 ehci_info(ehci, "enabled 64bit DMA\n");
562 // Philips, Intel, and maybe others need CMD_RUN before the
563 // root hub will detect new devices (why?); NEC doesn't
564 ehci->command &= ~(CMD_LRESET|CMD_IAAD|CMD_PSE|CMD_ASE|CMD_RESET);
565 ehci->command |= CMD_RUN;
566 ehci_writel(ehci, ehci->command, &ehci->regs->command);
567 dbg_cmd (ehci, "init", ehci->command);
570 * Start, enabling full USB 2.0 functionality ... usb 1.1 devices
571 * are explicitly handed to companion controller(s), so no TT is
572 * involved with the root hub. (Except where one is integrated,
573 * and there's no companion controller unless maybe for USB OTG.)
575 * Turning on the CF flag will transfer ownership of all ports
576 * from the companions to the EHCI controller. If any of the
577 * companions are in the middle of a port reset at the time, it
578 * could cause trouble. Write-locking ehci_cf_port_reset_rwsem
579 * guarantees that no resets are in progress. After we set CF,
580 * a short delay lets the hardware catch up; new resets shouldn't
581 * be started before the port switching actions could complete.
583 down_write(&ehci_cf_port_reset_rwsem);
584 hcd->state = HC_STATE_RUNNING;
585 ehci_writel(ehci, FLAG_CF, &ehci->regs->configured_flag);
586 ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
588 up_write(&ehci_cf_port_reset_rwsem);
590 temp = HC_VERSION(ehci_readl(ehci, &ehci->caps->hc_capbase));
592 "USB %x.%x started, EHCI %x.%02x, driver %s%s\n",
593 ((ehci->sbrn & 0xf0)>>4), (ehci->sbrn & 0x0f),
594 temp >> 8, temp & 0xff, DRIVER_VERSION,
595 ignore_oc ? ", overcurrent ignored" : "");
597 ehci_writel(ehci, INTR_MASK,
598 &ehci->regs->intr_enable); /* Turn On Interrupts */
600 /* GRR this is run-once init(), being done every time the HC starts.
601 * So long as they're part of class devices, we can't do it init()
602 * since the class device isn't created that early.
604 create_debug_files(ehci);
605 create_companion_file(ehci);
610 /*-------------------------------------------------------------------------*/
612 static irqreturn_t ehci_irq (struct usb_hcd *hcd)
614 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
615 u32 status, pcd_status = 0;
618 spin_lock (&ehci->lock);
620 status = ehci_readl(ehci, &ehci->regs->status);
622 /* e.g. cardbus physical eject */
623 if (status == ~(u32) 0) {
624 ehci_dbg (ehci, "device removed\n");
629 if (!status) { /* irq sharing? */
630 spin_unlock(&ehci->lock);
634 /* clear (just) interrupts */
635 ehci_writel(ehci, status, &ehci->regs->status);
636 ehci_readl(ehci, &ehci->regs->command); /* unblock posted write */
639 #ifdef EHCI_VERBOSE_DEBUG
640 /* unrequested/ignored: Frame List Rollover */
641 dbg_status (ehci, "irq", status);
644 /* INT, ERR, and IAA interrupt rates can be throttled */
646 /* normal [4.15.1.2] or error [4.15.1.1] completion */
647 if (likely ((status & (STS_INT|STS_ERR)) != 0)) {
648 if (likely ((status & STS_ERR) == 0))
649 COUNT (ehci->stats.normal);
651 COUNT (ehci->stats.error);
655 /* complete the unlinking of some qh [4.15.2.3] */
656 if (status & STS_IAA) {
657 COUNT (ehci->stats.reclaim);
658 ehci->reclaim_ready = 1;
662 /* remote wakeup [4.3.1] */
663 if (status & STS_PCD) {
664 unsigned i = HCS_N_PORTS (ehci->hcs_params);
667 /* resume root hub? */
668 if (!(ehci_readl(ehci, &ehci->regs->command) & CMD_RUN))
669 usb_hcd_resume_root_hub(hcd);
672 int pstatus = ehci_readl(ehci,
673 &ehci->regs->port_status [i]);
675 if (pstatus & PORT_OWNER)
677 if (!(pstatus & PORT_RESUME)
678 || ehci->reset_done [i] != 0)
681 /* start 20 msec resume signaling from this port,
682 * and make khubd collect PORT_STAT_C_SUSPEND to
683 * stop that signaling.
685 ehci->reset_done [i] = jiffies + msecs_to_jiffies (20);
686 ehci_dbg (ehci, "port %d remote wakeup\n", i + 1);
687 mod_timer(&hcd->rh_timer, ehci->reset_done[i]);
691 /* PCI errors [4.15.2.4] */
692 if (unlikely ((status & STS_FATAL) != 0)) {
693 /* bogus "fatal" IRQs appear on some chips... why? */
694 status = ehci_readl(ehci, &ehci->regs->status);
695 dbg_cmd (ehci, "fatal", ehci_readl(ehci,
696 &ehci->regs->command));
697 dbg_status (ehci, "fatal", status);
698 if (status & STS_HALT) {
699 ehci_err (ehci, "fatal error\n");
702 ehci_writel(ehci, 0, &ehci->regs->configured_flag);
703 /* generic layer kills/unlinks all urbs, then
704 * uses ehci_stop to clean up the rest
712 spin_unlock (&ehci->lock);
713 if (pcd_status & STS_PCD)
714 usb_hcd_poll_rh_status(hcd);
718 /*-------------------------------------------------------------------------*/
721 * non-error returns are a promise to giveback() the urb later
722 * we drop ownership so next owner (or urb unlink) can get it
724 * urb + dev is in hcd.self.controller.urb_list
725 * we're queueing TDs onto software and hardware lists
727 * hcd-specific init for hcpriv hasn't been done yet
729 * NOTE: control, bulk, and interrupt share the same code to append TDs
730 * to a (possibly active) QH, and the same QH scanning code.
732 static int ehci_urb_enqueue (
737 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
738 struct list_head qtd_list;
740 INIT_LIST_HEAD (&qtd_list);
742 switch (usb_pipetype (urb->pipe)) {
743 // case PIPE_CONTROL:
746 if (!qh_urb_transaction (ehci, urb, &qtd_list, mem_flags))
748 return submit_async(ehci, urb, &qtd_list, mem_flags);
751 if (!qh_urb_transaction (ehci, urb, &qtd_list, mem_flags))
753 return intr_submit(ehci, urb, &qtd_list, mem_flags);
755 case PIPE_ISOCHRONOUS:
756 if (urb->dev->speed == USB_SPEED_HIGH)
757 return itd_submit (ehci, urb, mem_flags);
759 return sitd_submit (ehci, urb, mem_flags);
763 static void unlink_async (struct ehci_hcd *ehci, struct ehci_qh *qh)
765 /* if we need to use IAA and it's busy, defer */
766 if (qh->qh_state == QH_STATE_LINKED
768 && HC_IS_RUNNING (ehci_to_hcd(ehci)->state)) {
769 struct ehci_qh *last;
771 for (last = ehci->reclaim;
773 last = last->reclaim)
775 qh->qh_state = QH_STATE_UNLINK_WAIT;
778 /* bypass IAA if the hc can't care */
779 } else if (!HC_IS_RUNNING (ehci_to_hcd(ehci)->state) && ehci->reclaim)
780 end_unlink_async (ehci);
782 /* something else might have unlinked the qh by now */
783 if (qh->qh_state == QH_STATE_LINKED)
784 start_unlink_async (ehci, qh);
787 /* remove from hardware lists
788 * completions normally happen asynchronously
791 static int ehci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
793 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
798 spin_lock_irqsave (&ehci->lock, flags);
799 rc = usb_hcd_check_unlink_urb(hcd, urb, status);
803 switch (usb_pipetype (urb->pipe)) {
804 // case PIPE_CONTROL:
807 qh = (struct ehci_qh *) urb->hcpriv;
810 unlink_async (ehci, qh);
814 qh = (struct ehci_qh *) urb->hcpriv;
817 switch (qh->qh_state) {
818 case QH_STATE_LINKED:
819 intr_deschedule (ehci, qh);
822 qh_completions (ehci, qh);
825 ehci_dbg (ehci, "bogus qh %p state %d\n",
830 /* reschedule QH iff another request is queued */
831 if (!list_empty (&qh->qtd_list)
832 && HC_IS_RUNNING (hcd->state)) {
835 status = qh_schedule (ehci, qh);
836 spin_unlock_irqrestore (&ehci->lock, flags);
839 // shouldn't happen often, but ...
840 // FIXME kill those tds' urbs
841 err ("can't reschedule qh %p, err %d",
848 case PIPE_ISOCHRONOUS:
851 // wait till next completion, do it then.
852 // completion irqs can wait up to 1024 msec,
856 spin_unlock_irqrestore (&ehci->lock, flags);
860 /*-------------------------------------------------------------------------*/
862 // bulk qh holds the data toggle
865 ehci_endpoint_disable (struct usb_hcd *hcd, struct usb_host_endpoint *ep)
867 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
869 struct ehci_qh *qh, *tmp;
871 /* ASSERT: any requests/urbs are being unlinked */
872 /* ASSERT: nobody can be submitting urbs for this any more */
875 spin_lock_irqsave (&ehci->lock, flags);
880 /* endpoints can be iso streams. for now, we don't
881 * accelerate iso completions ... so spin a while.
883 if (qh->hw_info1 == 0) {
884 ehci_vdbg (ehci, "iso delay\n");
888 if (!HC_IS_RUNNING (hcd->state))
889 qh->qh_state = QH_STATE_IDLE;
890 switch (qh->qh_state) {
891 case QH_STATE_LINKED:
892 for (tmp = ehci->async->qh_next.qh;
894 tmp = tmp->qh_next.qh)
896 /* periodic qh self-unlinks on empty */
899 unlink_async (ehci, qh);
901 case QH_STATE_UNLINK: /* wait for hw to finish? */
903 spin_unlock_irqrestore (&ehci->lock, flags);
904 schedule_timeout_uninterruptible(1);
906 case QH_STATE_IDLE: /* fully unlinked */
907 if (list_empty (&qh->qtd_list)) {
911 /* else FALL THROUGH */
914 /* caller was supposed to have unlinked any requests;
915 * that's not our job. just leak this memory.
917 ehci_err (ehci, "qh %p (#%02x) state %d%s\n",
918 qh, ep->desc.bEndpointAddress, qh->qh_state,
919 list_empty (&qh->qtd_list) ? "" : "(has tds)");
924 spin_unlock_irqrestore (&ehci->lock, flags);
928 static int ehci_get_frame (struct usb_hcd *hcd)
930 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
931 return (ehci_readl(ehci, &ehci->regs->frame_index) >> 3) %
935 /*-------------------------------------------------------------------------*/
937 #define DRIVER_INFO DRIVER_VERSION " " DRIVER_DESC
939 MODULE_DESCRIPTION (DRIVER_INFO);
940 MODULE_AUTHOR (DRIVER_AUTHOR);
941 MODULE_LICENSE ("GPL");
944 #include "ehci-pci.c"
945 #define PCI_DRIVER ehci_pci_driver
948 #ifdef CONFIG_USB_EHCI_FSL
949 #include "ehci-fsl.c"
950 #define PLATFORM_DRIVER ehci_fsl_driver
953 #ifdef CONFIG_SOC_AU1200
954 #include "ehci-au1xxx.c"
955 #define PLATFORM_DRIVER ehci_hcd_au1xxx_driver
958 #ifdef CONFIG_PPC_PS3
959 #include "ehci-ps3.c"
960 #define PS3_SYSTEM_BUS_DRIVER ps3_ehci_driver
964 #include "ehci-ppc-soc.c"
965 #define PLATFORM_DRIVER ehci_ppc_soc_driver
968 #if !defined(PCI_DRIVER) && !defined(PLATFORM_DRIVER) && \
969 !defined(PS3_SYSTEM_BUS_DRIVER)
970 #error "missing bus glue for ehci-hcd"
973 static int __init ehci_hcd_init(void)
977 pr_debug("%s: block sizes: qh %Zd qtd %Zd itd %Zd sitd %Zd\n",
979 sizeof(struct ehci_qh), sizeof(struct ehci_qtd),
980 sizeof(struct ehci_itd), sizeof(struct ehci_sitd));
983 ehci_debug_root = debugfs_create_dir("ehci", NULL);
984 if (!ehci_debug_root)
988 #ifdef PLATFORM_DRIVER
989 retval = platform_driver_register(&PLATFORM_DRIVER);
992 debugfs_remove(ehci_debug_root);
993 ehci_debug_root = NULL;
1000 retval = pci_register_driver(&PCI_DRIVER);
1003 debugfs_remove(ehci_debug_root);
1004 ehci_debug_root = NULL;
1006 #ifdef PLATFORM_DRIVER
1007 platform_driver_unregister(&PLATFORM_DRIVER);
1013 #ifdef PS3_SYSTEM_BUS_DRIVER
1014 retval = ps3_ehci_driver_register(&PS3_SYSTEM_BUS_DRIVER);
1017 debugfs_remove(ehci_debug_root);
1018 ehci_debug_root = NULL;
1020 #ifdef PLATFORM_DRIVER
1021 platform_driver_unregister(&PLATFORM_DRIVER);
1024 pci_unregister_driver(&PCI_DRIVER);
1032 module_init(ehci_hcd_init);
1034 static void __exit ehci_hcd_cleanup(void)
1036 #ifdef PLATFORM_DRIVER
1037 platform_driver_unregister(&PLATFORM_DRIVER);
1040 pci_unregister_driver(&PCI_DRIVER);
1042 #ifdef PS3_SYSTEM_BUS_DRIVER
1043 ps3_ehci_driver_unregister(&PS3_SYSTEM_BUS_DRIVER);
1046 debugfs_remove(ehci_debug_root);
1049 module_exit(ehci_hcd_cleanup);