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/smp_lock.h>
28 #include <linux/errno.h>
29 #include <linux/init.h>
30 #include <linux/timer.h>
31 #include <linux/list.h>
32 #include <linux/interrupt.h>
33 #include <linux/reboot.h>
34 #include <linux/usb.h>
35 #include <linux/moduleparam.h>
36 #include <linux/dma-mapping.h>
38 #include "../core/hcd.h"
40 #include <asm/byteorder.h>
43 #include <asm/system.h>
44 #include <asm/unaligned.h>
46 #include <asm/firmware.h>
50 /*-------------------------------------------------------------------------*/
53 * EHCI hc_driver implementation ... experimental, incomplete.
54 * Based on the final 1.0 register interface specification.
56 * USB 2.0 shows up in upcoming www.pcmcia.org technology.
57 * First was PCMCIA, like ISA; then CardBus, which is PCI.
58 * Next comes "CardBay", using USB 2.0 signals.
60 * Contains additional contributions by Brad Hards, Rory Bolt, and others.
61 * Special thanks to Intel and VIA for providing host controllers to
62 * test this driver on, and Cypress (including In-System Design) for
63 * providing early devices for those host controllers to talk to!
67 * 2004-05-10 Root hub and PCI suspend/resume support; remote wakeup. (db)
68 * 2004-02-24 Replace pci_* with generic dma_* API calls (dsaxena@plexity.net)
69 * 2003-12-29 Rewritten high speed iso transfer support (by Michal Sojka,
70 * <sojkam@centrum.cz>, updates by DB).
72 * 2002-11-29 Correct handling for hw async_next register.
73 * 2002-08-06 Handling for bulk and interrupt transfers is mostly shared;
74 * only scheduling is different, no arbitrary limitations.
75 * 2002-07-25 Sanity check PCI reads, mostly for better cardbus support,
76 * clean up HC run state handshaking.
77 * 2002-05-24 Preliminary FS/LS interrupts, using scheduling shortcuts
78 * 2002-05-11 Clear TT errors for FS/LS ctrl/bulk. Fill in some other
79 * missing pieces: enabling 64bit dma, handoff from BIOS/SMM.
80 * 2002-05-07 Some error path cleanups to report better errors; wmb();
81 * use non-CVS version id; better iso bandwidth claim.
82 * 2002-04-19 Control/bulk/interrupt submit no longer uses giveback() on
83 * errors in submit path. Bugfixes to interrupt scheduling/processing.
84 * 2002-03-05 Initial high-speed ISO support; reduce ITD memory; shift
85 * more checking to generic hcd framework (db). Make it work with
86 * Philips EHCI; reduce PCI traffic; shorten IRQ path (Rory Bolt).
87 * 2002-01-14 Minor cleanup; version synch.
88 * 2002-01-08 Fix roothub handoff of FS/LS to companion controllers.
89 * 2002-01-04 Control/Bulk queuing behaves.
91 * 2001-12-12 Initial patch version for Linux 2.5.1 kernel.
92 * 2001-June Works with usb-storage and NEC EHCI on 2.4
95 #define DRIVER_VERSION "10 Dec 2004"
96 #define DRIVER_AUTHOR "David Brownell"
97 #define DRIVER_DESC "USB 2.0 'Enhanced' Host Controller (EHCI) Driver"
99 static const char hcd_name [] = "ehci_hcd";
102 #undef EHCI_VERBOSE_DEBUG
103 #undef EHCI_URB_TRACE
109 /* magic numbers that can affect system performance */
110 #define EHCI_TUNE_CERR 3 /* 0-3 qtd retries; 0 == don't stop */
111 #define EHCI_TUNE_RL_HS 4 /* nak throttle; see 4.9 */
112 #define EHCI_TUNE_RL_TT 0
113 #define EHCI_TUNE_MULT_HS 1 /* 1-3 transactions/uframe; 4.10.3 */
114 #define EHCI_TUNE_MULT_TT 1
115 #define EHCI_TUNE_FLS 2 /* (small) 256 frame schedule */
117 #define EHCI_IAA_JIFFIES (HZ/100) /* arbitrary; ~10 msec */
118 #define EHCI_IO_JIFFIES (HZ/10) /* io watchdog > irq_thresh */
119 #define EHCI_ASYNC_JIFFIES (HZ/20) /* async idle timeout */
120 #define EHCI_SHRINK_JIFFIES (HZ/200) /* async qh unlink delay */
122 /* Initial IRQ latency: faster than hw default */
123 static int log2_irq_thresh = 0; // 0 to 6
124 module_param (log2_irq_thresh, int, S_IRUGO);
125 MODULE_PARM_DESC (log2_irq_thresh, "log2 IRQ latency, 1-64 microframes");
127 /* initial park setting: slower than hw default */
128 static unsigned park = 0;
129 module_param (park, uint, S_IRUGO);
130 MODULE_PARM_DESC (park, "park setting; 1-3 back-to-back async packets");
132 /* for flakey hardware, ignore overcurrent indicators */
133 static int ignore_oc = 0;
134 module_param (ignore_oc, bool, S_IRUGO);
135 MODULE_PARM_DESC (ignore_oc, "ignore bogus hardware overcurrent indications");
137 #define INTR_MASK (STS_IAA | STS_FATAL | STS_PCD | STS_ERR | STS_INT)
139 /*-------------------------------------------------------------------------*/
142 #include "ehci-dbg.c"
144 /*-------------------------------------------------------------------------*/
147 * handshake - spin reading hc until handshake completes or fails
148 * @ptr: address of hc register to be read
149 * @mask: bits to look at in result of read
150 * @done: value of those bits when handshake succeeds
151 * @usec: timeout in microseconds
153 * Returns negative errno, or zero on success
155 * Success happens when the "mask" bits have the specified value (hardware
156 * handshake done). There are two failure modes: "usec" have passed (major
157 * hardware flakeout), or the register reads as all-ones (hardware removed).
159 * That last failure should_only happen in cases like physical cardbus eject
160 * before driver shutdown. But it also seems to be caused by bugs in cardbus
161 * bridge shutdown: shutting down the bridge before the devices using it.
163 static int handshake (struct ehci_hcd *ehci, void __iomem *ptr,
164 u32 mask, u32 done, int usec)
169 result = ehci_readl(ehci, ptr);
170 if (result == ~(u32)0) /* card removed */
181 /* force HC to halt state from unknown (EHCI spec section 2.3) */
182 static int ehci_halt (struct ehci_hcd *ehci)
184 u32 temp = ehci_readl(ehci, &ehci->regs->status);
186 /* disable any irqs left enabled by previous code */
187 ehci_writel(ehci, 0, &ehci->regs->intr_enable);
189 if ((temp & STS_HALT) != 0)
192 temp = ehci_readl(ehci, &ehci->regs->command);
194 ehci_writel(ehci, temp, &ehci->regs->command);
195 return handshake (ehci, &ehci->regs->status,
196 STS_HALT, STS_HALT, 16 * 125);
199 /* put TDI/ARC silicon into EHCI mode */
200 static void tdi_reset (struct ehci_hcd *ehci)
202 u32 __iomem *reg_ptr;
205 reg_ptr = (u32 __iomem *)(((u8 __iomem *)ehci->regs) + 0x68);
206 tmp = ehci_readl(ehci, reg_ptr);
208 ehci_writel(ehci, tmp, reg_ptr);
211 /* reset a non-running (STS_HALT == 1) controller */
212 static int ehci_reset (struct ehci_hcd *ehci)
215 u32 command = ehci_readl(ehci, &ehci->regs->command);
217 command |= CMD_RESET;
218 dbg_cmd (ehci, "reset", command);
219 ehci_writel(ehci, command, &ehci->regs->command);
220 ehci_to_hcd(ehci)->state = HC_STATE_HALT;
221 ehci->next_statechange = jiffies;
222 retval = handshake (ehci, &ehci->regs->command,
223 CMD_RESET, 0, 250 * 1000);
228 if (ehci_is_TDI(ehci))
234 /* idle the controller (from running) */
235 static void ehci_quiesce (struct ehci_hcd *ehci)
240 if (!HC_IS_RUNNING (ehci_to_hcd(ehci)->state))
244 /* wait for any schedule enables/disables to take effect */
245 temp = ehci_readl(ehci, &ehci->regs->command) << 10;
246 temp &= STS_ASS | STS_PSS;
247 if (handshake (ehci, &ehci->regs->status, STS_ASS | STS_PSS,
248 temp, 16 * 125) != 0) {
249 ehci_to_hcd(ehci)->state = HC_STATE_HALT;
253 /* then disable anything that's still active */
254 temp = ehci_readl(ehci, &ehci->regs->command);
255 temp &= ~(CMD_ASE | CMD_IAAD | CMD_PSE);
256 ehci_writel(ehci, temp, &ehci->regs->command);
258 /* hardware can take 16 microframes to turn off ... */
259 if (handshake (ehci, &ehci->regs->status, STS_ASS | STS_PSS,
261 ehci_to_hcd(ehci)->state = HC_STATE_HALT;
266 /*-------------------------------------------------------------------------*/
268 static void ehci_work(struct ehci_hcd *ehci);
270 #include "ehci-hub.c"
271 #include "ehci-mem.c"
273 #include "ehci-sched.c"
275 /*-------------------------------------------------------------------------*/
277 static void ehci_watchdog (unsigned long param)
279 struct ehci_hcd *ehci = (struct ehci_hcd *) param;
282 spin_lock_irqsave (&ehci->lock, flags);
284 /* lost IAA irqs wedge things badly; seen with a vt8235 */
286 u32 status = ehci_readl(ehci, &ehci->regs->status);
287 if (status & STS_IAA) {
288 ehci_vdbg (ehci, "lost IAA\n");
289 COUNT (ehci->stats.lost_iaa);
290 ehci_writel(ehci, STS_IAA, &ehci->regs->status);
291 ehci->reclaim_ready = 1;
295 /* stop async processing after it's idled a bit */
296 if (test_bit (TIMER_ASYNC_OFF, &ehci->actions))
297 start_unlink_async (ehci, ehci->async);
299 /* ehci could run by timer, without IRQs ... */
302 spin_unlock_irqrestore (&ehci->lock, flags);
305 /* On some systems, leaving remote wakeup enabled prevents system shutdown.
306 * The firmware seems to think that powering off is a wakeup event!
307 * This routine turns off remote wakeup and everything else, on all ports.
309 static void ehci_turn_off_all_ports(struct ehci_hcd *ehci)
311 int port = HCS_N_PORTS(ehci->hcs_params);
314 ehci_writel(ehci, PORT_RWC_BITS,
315 &ehci->regs->port_status[port]);
318 /* ehci_shutdown kick in for silicon on any bus (not just pci, etc).
319 * This forcibly disables dma and IRQs, helping kexec and other cases
320 * where the next system software may expect clean state.
323 ehci_shutdown (struct usb_hcd *hcd)
325 struct ehci_hcd *ehci;
327 ehci = hcd_to_ehci (hcd);
328 (void) ehci_halt (ehci);
329 ehci_turn_off_all_ports(ehci);
331 /* make BIOS/etc use companion controller during reboot */
332 ehci_writel(ehci, 0, &ehci->regs->configured_flag);
334 /* unblock posted writes */
335 ehci_readl(ehci, &ehci->regs->configured_flag);
338 static void ehci_port_power (struct ehci_hcd *ehci, int is_on)
342 if (!HCS_PPC (ehci->hcs_params))
345 ehci_dbg (ehci, "...power%s ports...\n", is_on ? "up" : "down");
346 for (port = HCS_N_PORTS (ehci->hcs_params); port > 0; )
347 (void) ehci_hub_control(ehci_to_hcd(ehci),
348 is_on ? SetPortFeature : ClearPortFeature,
354 /*-------------------------------------------------------------------------*/
357 * ehci_work is called from some interrupts, timers, and so on.
358 * it calls driver completion functions, after dropping ehci->lock.
360 static void ehci_work (struct ehci_hcd *ehci)
362 timer_action_done (ehci, TIMER_IO_WATCHDOG);
363 if (ehci->reclaim_ready)
364 end_unlink_async (ehci);
366 /* another CPU may drop ehci->lock during a schedule scan while
367 * it reports urb completions. this flag guards against bogus
368 * attempts at re-entrant schedule scanning.
374 if (ehci->next_uframe != -1)
375 scan_periodic (ehci);
378 /* the IO watchdog guards against hardware or driver bugs that
379 * misplace IRQs, and should let us run completely without IRQs.
380 * such lossage has been observed on both VT6202 and VT8235.
382 if (HC_IS_RUNNING (ehci_to_hcd(ehci)->state) &&
383 (ehci->async->qh_next.ptr != NULL ||
384 ehci->periodic_sched != 0))
385 timer_action (ehci, TIMER_IO_WATCHDOG);
388 static void ehci_stop (struct usb_hcd *hcd)
390 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
392 ehci_dbg (ehci, "stop\n");
394 /* Turn off port power on all root hub ports. */
395 ehci_port_power (ehci, 0);
397 /* no more interrupts ... */
398 del_timer_sync (&ehci->watchdog);
400 spin_lock_irq(&ehci->lock);
401 if (HC_IS_RUNNING (hcd->state))
405 ehci_writel(ehci, 0, &ehci->regs->intr_enable);
406 spin_unlock_irq(&ehci->lock);
408 /* let companion controllers work when we aren't */
409 ehci_writel(ehci, 0, &ehci->regs->configured_flag);
411 remove_companion_file(ehci);
412 remove_debug_files (ehci);
414 /* root hub is shut down separately (first, when possible) */
415 spin_lock_irq (&ehci->lock);
418 spin_unlock_irq (&ehci->lock);
419 ehci_mem_cleanup (ehci);
422 ehci_dbg (ehci, "irq normal %ld err %ld reclaim %ld (lost %ld)\n",
423 ehci->stats.normal, ehci->stats.error, ehci->stats.reclaim,
424 ehci->stats.lost_iaa);
425 ehci_dbg (ehci, "complete %ld unlink %ld\n",
426 ehci->stats.complete, ehci->stats.unlink);
429 dbg_status (ehci, "ehci_stop completed",
430 ehci_readl(ehci, &ehci->regs->status));
433 /* one-time init, only for memory state */
434 static int ehci_init(struct usb_hcd *hcd)
436 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
441 spin_lock_init(&ehci->lock);
443 init_timer(&ehci->watchdog);
444 ehci->watchdog.function = ehci_watchdog;
445 ehci->watchdog.data = (unsigned long) ehci;
448 * hw default: 1K periodic list heads, one per frame.
449 * periodic_size can shrink by USBCMD update if hcc_params allows.
451 ehci->periodic_size = DEFAULT_I_TDPS;
452 if ((retval = ehci_mem_init(ehci, GFP_KERNEL)) < 0)
455 /* controllers may cache some of the periodic schedule ... */
456 hcc_params = ehci_readl(ehci, &ehci->caps->hcc_params);
457 if (HCC_ISOC_CACHE(hcc_params)) // full frame cache
459 else // N microframes cached
460 ehci->i_thresh = 2 + HCC_ISOC_THRES(hcc_params);
462 ehci->reclaim = NULL;
463 ehci->reclaim_ready = 0;
464 ehci->next_uframe = -1;
467 * dedicate a qh for the async ring head, since we couldn't unlink
468 * a 'real' qh without stopping the async schedule [4.8]. use it
469 * as the 'reclamation list head' too.
470 * its dummy is used in hw_alt_next of many tds, to prevent the qh
471 * from automatically advancing to the next td after short reads.
473 ehci->async->qh_next.qh = NULL;
474 ehci->async->hw_next = QH_NEXT(ehci->async->qh_dma);
475 ehci->async->hw_info1 = cpu_to_le32(QH_HEAD);
476 ehci->async->hw_token = cpu_to_le32(QTD_STS_HALT);
477 ehci->async->hw_qtd_next = EHCI_LIST_END;
478 ehci->async->qh_state = QH_STATE_LINKED;
479 ehci->async->hw_alt_next = QTD_NEXT(ehci->async->dummy->qtd_dma);
481 /* clear interrupt enables, set irq latency */
482 if (log2_irq_thresh < 0 || log2_irq_thresh > 6)
484 temp = 1 << (16 + log2_irq_thresh);
485 if (HCC_CANPARK(hcc_params)) {
486 /* HW default park == 3, on hardware that supports it (like
487 * NVidia and ALI silicon), maximizes throughput on the async
488 * schedule by avoiding QH fetches between transfers.
490 * With fast usb storage devices and NForce2, "park" seems to
491 * make problems: throughput reduction (!), data errors...
494 park = min(park, (unsigned) 3);
498 ehci_dbg(ehci, "park %d\n", park);
500 if (HCC_PGM_FRAMELISTLEN(hcc_params)) {
501 /* periodic schedule size can be smaller than default */
503 temp |= (EHCI_TUNE_FLS << 2);
504 switch (EHCI_TUNE_FLS) {
505 case 0: ehci->periodic_size = 1024; break;
506 case 1: ehci->periodic_size = 512; break;
507 case 2: ehci->periodic_size = 256; break;
511 ehci->command = temp;
516 /* start HC running; it's halted, ehci_init() has been run (once) */
517 static int ehci_run (struct usb_hcd *hcd)
519 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
524 hcd->uses_new_polling = 1;
527 /* EHCI spec section 4.1 */
528 if ((retval = ehci_reset(ehci)) != 0) {
529 ehci_mem_cleanup(ehci);
532 ehci_writel(ehci, ehci->periodic_dma, &ehci->regs->frame_list);
533 ehci_writel(ehci, (u32)ehci->async->qh_dma, &ehci->regs->async_next);
536 * hcc_params controls whether ehci->regs->segment must (!!!)
537 * be used; it constrains QH/ITD/SITD and QTD locations.
538 * pci_pool consistent memory always uses segment zero.
539 * streaming mappings for I/O buffers, like pci_map_single(),
540 * can return segments above 4GB, if the device allows.
542 * NOTE: the dma mask is visible through dma_supported(), so
543 * drivers can pass this info along ... like NETIF_F_HIGHDMA,
544 * Scsi_Host.highmem_io, and so forth. It's readonly to all
545 * host side drivers though.
547 hcc_params = ehci_readl(ehci, &ehci->caps->hcc_params);
548 if (HCC_64BIT_ADDR(hcc_params)) {
549 ehci_writel(ehci, 0, &ehci->regs->segment);
551 // this is deeply broken on almost all architectures
552 if (!dma_set_mask(hcd->self.controller, DMA_64BIT_MASK))
553 ehci_info(ehci, "enabled 64bit DMA\n");
558 // Philips, Intel, and maybe others need CMD_RUN before the
559 // root hub will detect new devices (why?); NEC doesn't
560 ehci->command &= ~(CMD_LRESET|CMD_IAAD|CMD_PSE|CMD_ASE|CMD_RESET);
561 ehci->command |= CMD_RUN;
562 ehci_writel(ehci, ehci->command, &ehci->regs->command);
563 dbg_cmd (ehci, "init", ehci->command);
566 * Start, enabling full USB 2.0 functionality ... usb 1.1 devices
567 * are explicitly handed to companion controller(s), so no TT is
568 * involved with the root hub. (Except where one is integrated,
569 * and there's no companion controller unless maybe for USB OTG.)
571 hcd->state = HC_STATE_RUNNING;
572 ehci_writel(ehci, FLAG_CF, &ehci->regs->configured_flag);
573 ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
575 temp = HC_VERSION(ehci_readl(ehci, &ehci->caps->hc_capbase));
577 "USB %x.%x started, EHCI %x.%02x, driver %s%s\n",
578 ((ehci->sbrn & 0xf0)>>4), (ehci->sbrn & 0x0f),
579 temp >> 8, temp & 0xff, DRIVER_VERSION,
580 ignore_oc ? ", overcurrent ignored" : "");
582 ehci_writel(ehci, INTR_MASK,
583 &ehci->regs->intr_enable); /* Turn On Interrupts */
585 /* GRR this is run-once init(), being done every time the HC starts.
586 * So long as they're part of class devices, we can't do it init()
587 * since the class device isn't created that early.
589 create_debug_files(ehci);
590 create_companion_file(ehci);
595 /*-------------------------------------------------------------------------*/
597 static irqreturn_t ehci_irq (struct usb_hcd *hcd)
599 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
600 u32 status, pcd_status = 0;
603 spin_lock (&ehci->lock);
605 status = ehci_readl(ehci, &ehci->regs->status);
607 /* e.g. cardbus physical eject */
608 if (status == ~(u32) 0) {
609 ehci_dbg (ehci, "device removed\n");
614 if (!status) { /* irq sharing? */
615 spin_unlock(&ehci->lock);
619 /* clear (just) interrupts */
620 ehci_writel(ehci, status, &ehci->regs->status);
621 ehci_readl(ehci, &ehci->regs->command); /* unblock posted write */
624 #ifdef EHCI_VERBOSE_DEBUG
625 /* unrequested/ignored: Frame List Rollover */
626 dbg_status (ehci, "irq", status);
629 /* INT, ERR, and IAA interrupt rates can be throttled */
631 /* normal [4.15.1.2] or error [4.15.1.1] completion */
632 if (likely ((status & (STS_INT|STS_ERR)) != 0)) {
633 if (likely ((status & STS_ERR) == 0))
634 COUNT (ehci->stats.normal);
636 COUNT (ehci->stats.error);
640 /* complete the unlinking of some qh [4.15.2.3] */
641 if (status & STS_IAA) {
642 COUNT (ehci->stats.reclaim);
643 ehci->reclaim_ready = 1;
647 /* remote wakeup [4.3.1] */
648 if (status & STS_PCD) {
649 unsigned i = HCS_N_PORTS (ehci->hcs_params);
652 /* resume root hub? */
653 if (!(ehci_readl(ehci, &ehci->regs->command) & CMD_RUN))
654 usb_hcd_resume_root_hub(hcd);
657 int pstatus = ehci_readl(ehci,
658 &ehci->regs->port_status [i]);
660 if (pstatus & PORT_OWNER)
662 if (!(pstatus & PORT_RESUME)
663 || ehci->reset_done [i] != 0)
666 /* start 20 msec resume signaling from this port,
667 * and make khubd collect PORT_STAT_C_SUSPEND to
668 * stop that signaling.
670 ehci->reset_done [i] = jiffies + msecs_to_jiffies (20);
671 ehci_dbg (ehci, "port %d remote wakeup\n", i + 1);
672 mod_timer(&hcd->rh_timer, ehci->reset_done[i]);
676 /* PCI errors [4.15.2.4] */
677 if (unlikely ((status & STS_FATAL) != 0)) {
678 /* bogus "fatal" IRQs appear on some chips... why? */
679 status = ehci_readl(ehci, &ehci->regs->status);
680 dbg_cmd (ehci, "fatal", ehci_readl(ehci,
681 &ehci->regs->command));
682 dbg_status (ehci, "fatal", status);
683 if (status & STS_HALT) {
684 ehci_err (ehci, "fatal error\n");
687 ehci_writel(ehci, 0, &ehci->regs->configured_flag);
688 /* generic layer kills/unlinks all urbs, then
689 * uses ehci_stop to clean up the rest
697 spin_unlock (&ehci->lock);
698 if (pcd_status & STS_PCD)
699 usb_hcd_poll_rh_status(hcd);
703 /*-------------------------------------------------------------------------*/
706 * non-error returns are a promise to giveback() the urb later
707 * we drop ownership so next owner (or urb unlink) can get it
709 * urb + dev is in hcd.self.controller.urb_list
710 * we're queueing TDs onto software and hardware lists
712 * hcd-specific init for hcpriv hasn't been done yet
714 * NOTE: control, bulk, and interrupt share the same code to append TDs
715 * to a (possibly active) QH, and the same QH scanning code.
717 static int ehci_urb_enqueue (
719 struct usb_host_endpoint *ep,
723 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
724 struct list_head qtd_list;
726 INIT_LIST_HEAD (&qtd_list);
728 switch (usb_pipetype (urb->pipe)) {
729 // case PIPE_CONTROL:
732 if (!qh_urb_transaction (ehci, urb, &qtd_list, mem_flags))
734 return submit_async (ehci, ep, urb, &qtd_list, mem_flags);
737 if (!qh_urb_transaction (ehci, urb, &qtd_list, mem_flags))
739 return intr_submit (ehci, ep, urb, &qtd_list, mem_flags);
741 case PIPE_ISOCHRONOUS:
742 if (urb->dev->speed == USB_SPEED_HIGH)
743 return itd_submit (ehci, urb, mem_flags);
745 return sitd_submit (ehci, urb, mem_flags);
749 static void unlink_async (struct ehci_hcd *ehci, struct ehci_qh *qh)
751 /* if we need to use IAA and it's busy, defer */
752 if (qh->qh_state == QH_STATE_LINKED
754 && HC_IS_RUNNING (ehci_to_hcd(ehci)->state)) {
755 struct ehci_qh *last;
757 for (last = ehci->reclaim;
759 last = last->reclaim)
761 qh->qh_state = QH_STATE_UNLINK_WAIT;
764 /* bypass IAA if the hc can't care */
765 } else if (!HC_IS_RUNNING (ehci_to_hcd(ehci)->state) && ehci->reclaim)
766 end_unlink_async (ehci);
768 /* something else might have unlinked the qh by now */
769 if (qh->qh_state == QH_STATE_LINKED)
770 start_unlink_async (ehci, qh);
773 /* remove from hardware lists
774 * completions normally happen asynchronously
777 static int ehci_urb_dequeue (struct usb_hcd *hcd, struct urb *urb)
779 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
783 spin_lock_irqsave (&ehci->lock, flags);
784 switch (usb_pipetype (urb->pipe)) {
785 // case PIPE_CONTROL:
788 qh = (struct ehci_qh *) urb->hcpriv;
791 unlink_async (ehci, qh);
795 qh = (struct ehci_qh *) urb->hcpriv;
798 switch (qh->qh_state) {
799 case QH_STATE_LINKED:
800 intr_deschedule (ehci, qh);
803 qh_completions (ehci, qh);
806 ehci_dbg (ehci, "bogus qh %p state %d\n",
811 /* reschedule QH iff another request is queued */
812 if (!list_empty (&qh->qtd_list)
813 && HC_IS_RUNNING (hcd->state)) {
816 status = qh_schedule (ehci, qh);
817 spin_unlock_irqrestore (&ehci->lock, flags);
820 // shouldn't happen often, but ...
821 // FIXME kill those tds' urbs
822 err ("can't reschedule qh %p, err %d",
829 case PIPE_ISOCHRONOUS:
832 // wait till next completion, do it then.
833 // completion irqs can wait up to 1024 msec,
837 spin_unlock_irqrestore (&ehci->lock, flags);
841 /*-------------------------------------------------------------------------*/
843 // bulk qh holds the data toggle
846 ehci_endpoint_disable (struct usb_hcd *hcd, struct usb_host_endpoint *ep)
848 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
850 struct ehci_qh *qh, *tmp;
852 /* ASSERT: any requests/urbs are being unlinked */
853 /* ASSERT: nobody can be submitting urbs for this any more */
856 spin_lock_irqsave (&ehci->lock, flags);
861 /* endpoints can be iso streams. for now, we don't
862 * accelerate iso completions ... so spin a while.
864 if (qh->hw_info1 == 0) {
865 ehci_vdbg (ehci, "iso delay\n");
869 if (!HC_IS_RUNNING (hcd->state))
870 qh->qh_state = QH_STATE_IDLE;
871 switch (qh->qh_state) {
872 case QH_STATE_LINKED:
873 for (tmp = ehci->async->qh_next.qh;
875 tmp = tmp->qh_next.qh)
877 /* periodic qh self-unlinks on empty */
880 unlink_async (ehci, qh);
882 case QH_STATE_UNLINK: /* wait for hw to finish? */
884 spin_unlock_irqrestore (&ehci->lock, flags);
885 schedule_timeout_uninterruptible(1);
887 case QH_STATE_IDLE: /* fully unlinked */
888 if (list_empty (&qh->qtd_list)) {
892 /* else FALL THROUGH */
895 /* caller was supposed to have unlinked any requests;
896 * that's not our job. just leak this memory.
898 ehci_err (ehci, "qh %p (#%02x) state %d%s\n",
899 qh, ep->desc.bEndpointAddress, qh->qh_state,
900 list_empty (&qh->qtd_list) ? "" : "(has tds)");
905 spin_unlock_irqrestore (&ehci->lock, flags);
909 static int ehci_get_frame (struct usb_hcd *hcd)
911 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
912 return (ehci_readl(ehci, &ehci->regs->frame_index) >> 3) %
916 /*-------------------------------------------------------------------------*/
918 #define DRIVER_INFO DRIVER_VERSION " " DRIVER_DESC
920 MODULE_DESCRIPTION (DRIVER_INFO);
921 MODULE_AUTHOR (DRIVER_AUTHOR);
922 MODULE_LICENSE ("GPL");
925 #include "ehci-pci.c"
926 #define PCI_DRIVER ehci_pci_driver
929 #ifdef CONFIG_MPC834x
930 #include "ehci-fsl.c"
931 #define PLATFORM_DRIVER ehci_fsl_driver
934 #ifdef CONFIG_SOC_AU1200
935 #include "ehci-au1xxx.c"
936 #define PLATFORM_DRIVER ehci_hcd_au1xxx_driver
939 #ifdef CONFIG_PPC_PS3
940 #include "ehci-ps3.c"
941 #define PS3_SYSTEM_BUS_DRIVER ps3_ehci_sb_driver
944 #if !defined(PCI_DRIVER) && !defined(PLATFORM_DRIVER) && \
945 !defined(PS3_SYSTEM_BUS_DRIVER)
946 #error "missing bus glue for ehci-hcd"
949 static int __init ehci_hcd_init(void)
953 pr_debug("%s: block sizes: qh %Zd qtd %Zd itd %Zd sitd %Zd\n",
955 sizeof(struct ehci_qh), sizeof(struct ehci_qtd),
956 sizeof(struct ehci_itd), sizeof(struct ehci_sitd));
958 #ifdef PLATFORM_DRIVER
959 retval = platform_driver_register(&PLATFORM_DRIVER);
965 retval = pci_register_driver(&PCI_DRIVER);
967 #ifdef PLATFORM_DRIVER
968 platform_driver_unregister(&PLATFORM_DRIVER);
974 #ifdef PS3_SYSTEM_BUS_DRIVER
975 if (firmware_has_feature(FW_FEATURE_PS3_LV1)) {
976 retval = ps3_system_bus_driver_register(
977 &PS3_SYSTEM_BUS_DRIVER);
979 #ifdef PLATFORM_DRIVER
980 platform_driver_unregister(&PLATFORM_DRIVER);
983 pci_unregister_driver(&PCI_DRIVER);
992 module_init(ehci_hcd_init);
994 static void __exit ehci_hcd_cleanup(void)
996 #ifdef PLATFORM_DRIVER
997 platform_driver_unregister(&PLATFORM_DRIVER);
1000 pci_unregister_driver(&PCI_DRIVER);
1002 #ifdef PS3_SYSTEM_BUS_DRIVER
1003 if (firmware_has_feature(FW_FEATURE_PS3_LV1))
1004 ps3_system_bus_driver_unregister(&PS3_SYSTEM_BUS_DRIVER);
1007 module_exit(ehci_hcd_cleanup);