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_MSECS 10 /* arbitrary */
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 end_unlink_async(struct ehci_hcd *ehci);
271 static void ehci_work(struct ehci_hcd *ehci);
273 #include "ehci-hub.c"
274 #include "ehci-mem.c"
276 #include "ehci-sched.c"
278 /*-------------------------------------------------------------------------*/
280 static void ehci_iaa_watchdog(unsigned long param)
282 struct ehci_hcd *ehci = (struct ehci_hcd *) param;
285 spin_lock_irqsave (&ehci->lock, flags);
287 /* Lost IAA irqs wedge things badly; seen first with a vt8235.
288 * So we need this watchdog, but must protect it against both
289 * (a) SMP races against real IAA firing and retriggering, and
290 * (b) clean HC shutdown, when IAA watchdog was pending.
293 && !timer_pending(&ehci->iaa_watchdog)
294 && HC_IS_RUNNING(ehci_to_hcd(ehci)->state)) {
297 /* If we get here, IAA is *REALLY* late. It's barely
298 * conceivable that the system is so busy that CMD_IAAD
299 * is still legitimately set, so let's be sure it's
300 * clear before we read STS_IAA. (The HC should clear
301 * CMD_IAAD when it sets STS_IAA.)
303 cmd = ehci_readl(ehci, &ehci->regs->command);
305 ehci_writel(ehci, cmd & ~CMD_IAAD,
306 &ehci->regs->command);
308 /* If IAA is set here it either legitimately triggered
309 * before we cleared IAAD above (but _way_ late, so we'll
310 * still count it as lost) ... or a silicon erratum:
311 * - VIA seems to set IAA without triggering the IRQ;
312 * - IAAD potentially cleared without setting IAA.
314 status = ehci_readl(ehci, &ehci->regs->status);
315 if ((status & STS_IAA) || !(cmd & CMD_IAAD)) {
316 COUNT (ehci->stats.lost_iaa);
317 ehci_writel(ehci, STS_IAA, &ehci->regs->status);
320 ehci_vdbg(ehci, "IAA watchdog: status %x cmd %x\n",
322 end_unlink_async(ehci);
325 spin_unlock_irqrestore(&ehci->lock, flags);
328 static void ehci_watchdog(unsigned long param)
330 struct ehci_hcd *ehci = (struct ehci_hcd *) param;
333 spin_lock_irqsave(&ehci->lock, flags);
335 /* stop async processing after it's idled a bit */
336 if (test_bit (TIMER_ASYNC_OFF, &ehci->actions))
337 start_unlink_async (ehci, ehci->async);
339 /* ehci could run by timer, without IRQs ... */
342 spin_unlock_irqrestore (&ehci->lock, flags);
345 /* On some systems, leaving remote wakeup enabled prevents system shutdown.
346 * The firmware seems to think that powering off is a wakeup event!
347 * This routine turns off remote wakeup and everything else, on all ports.
349 static void ehci_turn_off_all_ports(struct ehci_hcd *ehci)
351 int port = HCS_N_PORTS(ehci->hcs_params);
354 ehci_writel(ehci, PORT_RWC_BITS,
355 &ehci->regs->port_status[port]);
358 /* ehci_shutdown kick in for silicon on any bus (not just pci, etc).
359 * This forcibly disables dma and IRQs, helping kexec and other cases
360 * where the next system software may expect clean state.
363 ehci_shutdown (struct usb_hcd *hcd)
365 struct ehci_hcd *ehci;
367 ehci = hcd_to_ehci (hcd);
368 (void) ehci_halt (ehci);
369 ehci_turn_off_all_ports(ehci);
371 /* make BIOS/etc use companion controller during reboot */
372 ehci_writel(ehci, 0, &ehci->regs->configured_flag);
374 /* unblock posted writes */
375 ehci_readl(ehci, &ehci->regs->configured_flag);
378 static void ehci_port_power (struct ehci_hcd *ehci, int is_on)
382 if (!HCS_PPC (ehci->hcs_params))
385 ehci_dbg (ehci, "...power%s ports...\n", is_on ? "up" : "down");
386 for (port = HCS_N_PORTS (ehci->hcs_params); port > 0; )
387 (void) ehci_hub_control(ehci_to_hcd(ehci),
388 is_on ? SetPortFeature : ClearPortFeature,
391 /* Flush those writes */
392 ehci_readl(ehci, &ehci->regs->command);
396 /*-------------------------------------------------------------------------*/
399 * ehci_work is called from some interrupts, timers, and so on.
400 * it calls driver completion functions, after dropping ehci->lock.
402 static void ehci_work (struct ehci_hcd *ehci)
404 timer_action_done (ehci, TIMER_IO_WATCHDOG);
406 /* another CPU may drop ehci->lock during a schedule scan while
407 * it reports urb completions. this flag guards against bogus
408 * attempts at re-entrant schedule scanning.
414 if (ehci->next_uframe != -1)
415 scan_periodic (ehci);
418 /* the IO watchdog guards against hardware or driver bugs that
419 * misplace IRQs, and should let us run completely without IRQs.
420 * such lossage has been observed on both VT6202 and VT8235.
422 if (HC_IS_RUNNING (ehci_to_hcd(ehci)->state) &&
423 (ehci->async->qh_next.ptr != NULL ||
424 ehci->periodic_sched != 0))
425 timer_action (ehci, TIMER_IO_WATCHDOG);
428 static void ehci_stop (struct usb_hcd *hcd)
430 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
432 ehci_dbg (ehci, "stop\n");
434 /* Turn off port power on all root hub ports. */
435 ehci_port_power (ehci, 0);
437 /* no more interrupts ... */
438 del_timer_sync (&ehci->watchdog);
439 del_timer_sync(&ehci->iaa_watchdog);
441 spin_lock_irq(&ehci->lock);
442 if (HC_IS_RUNNING (hcd->state))
446 ehci_writel(ehci, 0, &ehci->regs->intr_enable);
447 spin_unlock_irq(&ehci->lock);
449 /* let companion controllers work when we aren't */
450 ehci_writel(ehci, 0, &ehci->regs->configured_flag);
452 remove_companion_file(ehci);
453 remove_debug_files (ehci);
455 /* root hub is shut down separately (first, when possible) */
456 spin_lock_irq (&ehci->lock);
459 spin_unlock_irq (&ehci->lock);
460 ehci_mem_cleanup (ehci);
463 ehci_dbg (ehci, "irq normal %ld err %ld reclaim %ld (lost %ld)\n",
464 ehci->stats.normal, ehci->stats.error, ehci->stats.reclaim,
465 ehci->stats.lost_iaa);
466 ehci_dbg (ehci, "complete %ld unlink %ld\n",
467 ehci->stats.complete, ehci->stats.unlink);
470 dbg_status (ehci, "ehci_stop completed",
471 ehci_readl(ehci, &ehci->regs->status));
474 /* one-time init, only for memory state */
475 static int ehci_init(struct usb_hcd *hcd)
477 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
482 spin_lock_init(&ehci->lock);
484 init_timer(&ehci->watchdog);
485 ehci->watchdog.function = ehci_watchdog;
486 ehci->watchdog.data = (unsigned long) ehci;
488 init_timer(&ehci->iaa_watchdog);
489 ehci->iaa_watchdog.function = ehci_iaa_watchdog;
490 ehci->iaa_watchdog.data = (unsigned long) ehci;
493 * hw default: 1K periodic list heads, one per frame.
494 * periodic_size can shrink by USBCMD update if hcc_params allows.
496 ehci->periodic_size = DEFAULT_I_TDPS;
497 if ((retval = ehci_mem_init(ehci, GFP_KERNEL)) < 0)
500 /* controllers may cache some of the periodic schedule ... */
501 hcc_params = ehci_readl(ehci, &ehci->caps->hcc_params);
502 if (HCC_ISOC_CACHE(hcc_params)) // full frame cache
504 else // N microframes cached
505 ehci->i_thresh = 2 + HCC_ISOC_THRES(hcc_params);
507 ehci->reclaim = NULL;
508 ehci->next_uframe = -1;
511 * dedicate a qh for the async ring head, since we couldn't unlink
512 * a 'real' qh without stopping the async schedule [4.8]. use it
513 * as the 'reclamation list head' too.
514 * its dummy is used in hw_alt_next of many tds, to prevent the qh
515 * from automatically advancing to the next td after short reads.
517 ehci->async->qh_next.qh = NULL;
518 ehci->async->hw_next = QH_NEXT(ehci, ehci->async->qh_dma);
519 ehci->async->hw_info1 = cpu_to_hc32(ehci, QH_HEAD);
520 ehci->async->hw_token = cpu_to_hc32(ehci, QTD_STS_HALT);
521 ehci->async->hw_qtd_next = EHCI_LIST_END(ehci);
522 ehci->async->qh_state = QH_STATE_LINKED;
523 ehci->async->hw_alt_next = QTD_NEXT(ehci, ehci->async->dummy->qtd_dma);
525 /* clear interrupt enables, set irq latency */
526 if (log2_irq_thresh < 0 || log2_irq_thresh > 6)
528 temp = 1 << (16 + log2_irq_thresh);
529 if (HCC_CANPARK(hcc_params)) {
530 /* HW default park == 3, on hardware that supports it (like
531 * NVidia and ALI silicon), maximizes throughput on the async
532 * schedule by avoiding QH fetches between transfers.
534 * With fast usb storage devices and NForce2, "park" seems to
535 * make problems: throughput reduction (!), data errors...
538 park = min(park, (unsigned) 3);
542 ehci_dbg(ehci, "park %d\n", park);
544 if (HCC_PGM_FRAMELISTLEN(hcc_params)) {
545 /* periodic schedule size can be smaller than default */
547 temp |= (EHCI_TUNE_FLS << 2);
548 switch (EHCI_TUNE_FLS) {
549 case 0: ehci->periodic_size = 1024; break;
550 case 1: ehci->periodic_size = 512; break;
551 case 2: ehci->periodic_size = 256; break;
555 ehci->command = temp;
560 /* start HC running; it's halted, ehci_init() has been run (once) */
561 static int ehci_run (struct usb_hcd *hcd)
563 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
568 hcd->uses_new_polling = 1;
571 /* EHCI spec section 4.1 */
572 if ((retval = ehci_reset(ehci)) != 0) {
573 ehci_mem_cleanup(ehci);
576 ehci_writel(ehci, ehci->periodic_dma, &ehci->regs->frame_list);
577 ehci_writel(ehci, (u32)ehci->async->qh_dma, &ehci->regs->async_next);
580 * hcc_params controls whether ehci->regs->segment must (!!!)
581 * be used; it constrains QH/ITD/SITD and QTD locations.
582 * pci_pool consistent memory always uses segment zero.
583 * streaming mappings for I/O buffers, like pci_map_single(),
584 * can return segments above 4GB, if the device allows.
586 * NOTE: the dma mask is visible through dma_supported(), so
587 * drivers can pass this info along ... like NETIF_F_HIGHDMA,
588 * Scsi_Host.highmem_io, and so forth. It's readonly to all
589 * host side drivers though.
591 hcc_params = ehci_readl(ehci, &ehci->caps->hcc_params);
592 if (HCC_64BIT_ADDR(hcc_params)) {
593 ehci_writel(ehci, 0, &ehci->regs->segment);
595 // this is deeply broken on almost all architectures
596 if (!dma_set_mask(hcd->self.controller, DMA_64BIT_MASK))
597 ehci_info(ehci, "enabled 64bit DMA\n");
602 // Philips, Intel, and maybe others need CMD_RUN before the
603 // root hub will detect new devices (why?); NEC doesn't
604 ehci->command &= ~(CMD_LRESET|CMD_IAAD|CMD_PSE|CMD_ASE|CMD_RESET);
605 ehci->command |= CMD_RUN;
606 ehci_writel(ehci, ehci->command, &ehci->regs->command);
607 dbg_cmd (ehci, "init", ehci->command);
610 * Start, enabling full USB 2.0 functionality ... usb 1.1 devices
611 * are explicitly handed to companion controller(s), so no TT is
612 * involved with the root hub. (Except where one is integrated,
613 * and there's no companion controller unless maybe for USB OTG.)
615 * Turning on the CF flag will transfer ownership of all ports
616 * from the companions to the EHCI controller. If any of the
617 * companions are in the middle of a port reset at the time, it
618 * could cause trouble. Write-locking ehci_cf_port_reset_rwsem
619 * guarantees that no resets are in progress. After we set CF,
620 * a short delay lets the hardware catch up; new resets shouldn't
621 * be started before the port switching actions could complete.
623 down_write(&ehci_cf_port_reset_rwsem);
624 hcd->state = HC_STATE_RUNNING;
625 ehci_writel(ehci, FLAG_CF, &ehci->regs->configured_flag);
626 ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
628 up_write(&ehci_cf_port_reset_rwsem);
630 temp = HC_VERSION(ehci_readl(ehci, &ehci->caps->hc_capbase));
632 "USB %x.%x started, EHCI %x.%02x, driver %s%s\n",
633 ((ehci->sbrn & 0xf0)>>4), (ehci->sbrn & 0x0f),
634 temp >> 8, temp & 0xff, DRIVER_VERSION,
635 ignore_oc ? ", overcurrent ignored" : "");
637 ehci_writel(ehci, INTR_MASK,
638 &ehci->regs->intr_enable); /* Turn On Interrupts */
640 /* GRR this is run-once init(), being done every time the HC starts.
641 * So long as they're part of class devices, we can't do it init()
642 * since the class device isn't created that early.
644 create_debug_files(ehci);
645 create_companion_file(ehci);
650 /*-------------------------------------------------------------------------*/
652 static irqreturn_t ehci_irq (struct usb_hcd *hcd)
654 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
655 u32 status, pcd_status = 0, cmd;
658 spin_lock (&ehci->lock);
660 status = ehci_readl(ehci, &ehci->regs->status);
662 /* e.g. cardbus physical eject */
663 if (status == ~(u32) 0) {
664 ehci_dbg (ehci, "device removed\n");
669 if (!status) { /* irq sharing? */
670 spin_unlock(&ehci->lock);
674 /* clear (just) interrupts */
675 ehci_writel(ehci, status, &ehci->regs->status);
676 cmd = ehci_readl(ehci, &ehci->regs->command);
679 #ifdef EHCI_VERBOSE_DEBUG
680 /* unrequested/ignored: Frame List Rollover */
681 dbg_status (ehci, "irq", status);
684 /* INT, ERR, and IAA interrupt rates can be throttled */
686 /* normal [4.15.1.2] or error [4.15.1.1] completion */
687 if (likely ((status & (STS_INT|STS_ERR)) != 0)) {
688 if (likely ((status & STS_ERR) == 0))
689 COUNT (ehci->stats.normal);
691 COUNT (ehci->stats.error);
695 /* complete the unlinking of some qh [4.15.2.3] */
696 if (status & STS_IAA) {
697 /* guard against (alleged) silicon errata */
698 if (cmd & CMD_IAAD) {
699 ehci_writel(ehci, cmd & ~CMD_IAAD,
700 &ehci->regs->command);
701 ehci_dbg(ehci, "IAA with IAAD still set?\n");
704 COUNT(ehci->stats.reclaim);
705 end_unlink_async(ehci);
707 ehci_dbg(ehci, "IAA with nothing to reclaim?\n");
710 /* remote wakeup [4.3.1] */
711 if (status & STS_PCD) {
712 unsigned i = HCS_N_PORTS (ehci->hcs_params);
715 /* resume root hub? */
716 if (!(ehci_readl(ehci, &ehci->regs->command) & CMD_RUN))
717 usb_hcd_resume_root_hub(hcd);
720 int pstatus = ehci_readl(ehci,
721 &ehci->regs->port_status [i]);
723 if (pstatus & PORT_OWNER)
725 if (!(pstatus & PORT_RESUME)
726 || ehci->reset_done [i] != 0)
729 /* start 20 msec resume signaling from this port,
730 * and make khubd collect PORT_STAT_C_SUSPEND to
731 * stop that signaling.
733 ehci->reset_done [i] = jiffies + msecs_to_jiffies (20);
734 ehci_dbg (ehci, "port %d remote wakeup\n", i + 1);
735 mod_timer(&hcd->rh_timer, ehci->reset_done[i]);
739 /* PCI errors [4.15.2.4] */
740 if (unlikely ((status & STS_FATAL) != 0)) {
741 /* bogus "fatal" IRQs appear on some chips... why? */
742 status = ehci_readl(ehci, &ehci->regs->status);
743 dbg_cmd (ehci, "fatal", ehci_readl(ehci,
744 &ehci->regs->command));
745 dbg_status (ehci, "fatal", status);
746 if (status & STS_HALT) {
747 ehci_err (ehci, "fatal error\n");
750 ehci_writel(ehci, 0, &ehci->regs->configured_flag);
751 /* generic layer kills/unlinks all urbs, then
752 * uses ehci_stop to clean up the rest
760 spin_unlock (&ehci->lock);
761 if (pcd_status & STS_PCD)
762 usb_hcd_poll_rh_status(hcd);
766 /*-------------------------------------------------------------------------*/
769 * non-error returns are a promise to giveback() the urb later
770 * we drop ownership so next owner (or urb unlink) can get it
772 * urb + dev is in hcd.self.controller.urb_list
773 * we're queueing TDs onto software and hardware lists
775 * hcd-specific init for hcpriv hasn't been done yet
777 * NOTE: control, bulk, and interrupt share the same code to append TDs
778 * to a (possibly active) QH, and the same QH scanning code.
780 static int ehci_urb_enqueue (
785 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
786 struct list_head qtd_list;
788 INIT_LIST_HEAD (&qtd_list);
790 switch (usb_pipetype (urb->pipe)) {
791 // case PIPE_CONTROL:
794 if (!qh_urb_transaction (ehci, urb, &qtd_list, mem_flags))
796 return submit_async(ehci, urb, &qtd_list, mem_flags);
799 if (!qh_urb_transaction (ehci, urb, &qtd_list, mem_flags))
801 return intr_submit(ehci, urb, &qtd_list, mem_flags);
803 case PIPE_ISOCHRONOUS:
804 if (urb->dev->speed == USB_SPEED_HIGH)
805 return itd_submit (ehci, urb, mem_flags);
807 return sitd_submit (ehci, urb, mem_flags);
811 static void unlink_async (struct ehci_hcd *ehci, struct ehci_qh *qh)
814 if (!HC_IS_RUNNING(ehci_to_hcd(ehci)->state) && ehci->reclaim)
815 end_unlink_async(ehci);
817 /* if it's not linked then there's nothing to do */
818 if (qh->qh_state != QH_STATE_LINKED)
821 /* defer till later if busy */
822 else if (ehci->reclaim) {
823 struct ehci_qh *last;
825 for (last = ehci->reclaim;
827 last = last->reclaim)
829 qh->qh_state = QH_STATE_UNLINK_WAIT;
832 /* start IAA cycle */
834 start_unlink_async (ehci, qh);
837 /* remove from hardware lists
838 * completions normally happen asynchronously
841 static int ehci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
843 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
848 spin_lock_irqsave (&ehci->lock, flags);
849 rc = usb_hcd_check_unlink_urb(hcd, urb, status);
853 switch (usb_pipetype (urb->pipe)) {
854 // case PIPE_CONTROL:
857 qh = (struct ehci_qh *) urb->hcpriv;
860 switch (qh->qh_state) {
861 case QH_STATE_LINKED:
862 case QH_STATE_COMPLETING:
863 unlink_async(ehci, qh);
865 case QH_STATE_UNLINK:
866 case QH_STATE_UNLINK_WAIT:
867 /* already started */
876 qh = (struct ehci_qh *) urb->hcpriv;
879 switch (qh->qh_state) {
880 case QH_STATE_LINKED:
881 intr_deschedule (ehci, qh);
884 qh_completions (ehci, qh);
887 ehci_dbg (ehci, "bogus qh %p state %d\n",
892 /* reschedule QH iff another request is queued */
893 if (!list_empty (&qh->qtd_list)
894 && HC_IS_RUNNING (hcd->state)) {
895 rc = qh_schedule(ehci, qh);
897 /* An error here likely indicates handshake failure
898 * or no space left in the schedule. Neither fault
899 * should happen often ...
901 * FIXME kill the now-dysfunctional queued urbs
905 "can't reschedule qh %p, err %d",
910 case PIPE_ISOCHRONOUS:
913 // wait till next completion, do it then.
914 // completion irqs can wait up to 1024 msec,
918 spin_unlock_irqrestore (&ehci->lock, flags);
922 /*-------------------------------------------------------------------------*/
924 // bulk qh holds the data toggle
927 ehci_endpoint_disable (struct usb_hcd *hcd, struct usb_host_endpoint *ep)
929 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
931 struct ehci_qh *qh, *tmp;
933 /* ASSERT: any requests/urbs are being unlinked */
934 /* ASSERT: nobody can be submitting urbs for this any more */
937 spin_lock_irqsave (&ehci->lock, flags);
942 /* endpoints can be iso streams. for now, we don't
943 * accelerate iso completions ... so spin a while.
945 if (qh->hw_info1 == 0) {
946 ehci_vdbg (ehci, "iso delay\n");
950 if (!HC_IS_RUNNING (hcd->state))
951 qh->qh_state = QH_STATE_IDLE;
952 switch (qh->qh_state) {
953 case QH_STATE_LINKED:
954 for (tmp = ehci->async->qh_next.qh;
956 tmp = tmp->qh_next.qh)
958 /* periodic qh self-unlinks on empty */
961 unlink_async (ehci, qh);
963 case QH_STATE_UNLINK: /* wait for hw to finish? */
964 case QH_STATE_UNLINK_WAIT:
966 spin_unlock_irqrestore (&ehci->lock, flags);
967 schedule_timeout_uninterruptible(1);
969 case QH_STATE_IDLE: /* fully unlinked */
970 if (list_empty (&qh->qtd_list)) {
974 /* else FALL THROUGH */
977 /* caller was supposed to have unlinked any requests;
978 * that's not our job. just leak this memory.
980 ehci_err (ehci, "qh %p (#%02x) state %d%s\n",
981 qh, ep->desc.bEndpointAddress, qh->qh_state,
982 list_empty (&qh->qtd_list) ? "" : "(has tds)");
987 spin_unlock_irqrestore (&ehci->lock, flags);
991 static int ehci_get_frame (struct usb_hcd *hcd)
993 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
994 return (ehci_readl(ehci, &ehci->regs->frame_index) >> 3) %
998 /*-------------------------------------------------------------------------*/
1000 #define DRIVER_INFO DRIVER_VERSION " " DRIVER_DESC
1002 MODULE_DESCRIPTION (DRIVER_INFO);
1003 MODULE_AUTHOR (DRIVER_AUTHOR);
1004 MODULE_LICENSE ("GPL");
1007 #include "ehci-pci.c"
1008 #define PCI_DRIVER ehci_pci_driver
1011 #ifdef CONFIG_USB_EHCI_FSL
1012 #include "ehci-fsl.c"
1013 #define PLATFORM_DRIVER ehci_fsl_driver
1016 #ifdef CONFIG_SOC_AU1200
1017 #include "ehci-au1xxx.c"
1018 #define PLATFORM_DRIVER ehci_hcd_au1xxx_driver
1021 #ifdef CONFIG_PPC_PS3
1022 #include "ehci-ps3.c"
1023 #define PS3_SYSTEM_BUS_DRIVER ps3_ehci_driver
1026 #if defined(CONFIG_440EPX) && !defined(CONFIG_PPC_MERGE)
1027 #include "ehci-ppc-soc.c"
1028 #define PLATFORM_DRIVER ehci_ppc_soc_driver
1031 #ifdef CONFIG_USB_EHCI_HCD_PPC_OF
1032 #include "ehci-ppc-of.c"
1033 #define OF_PLATFORM_DRIVER ehci_hcd_ppc_of_driver
1036 #ifdef CONFIG_ARCH_ORION
1037 #include "ehci-orion.c"
1038 #define PLATFORM_DRIVER ehci_orion_driver
1041 #ifdef CONFIG_ARCH_IXP4XX
1042 #include "ehci-ixp4xx.c"
1043 #define PLATFORM_DRIVER ixp4xx_ehci_driver
1046 #if !defined(PCI_DRIVER) && !defined(PLATFORM_DRIVER) && \
1047 !defined(PS3_SYSTEM_BUS_DRIVER) && !defined(OF_PLATFORM_DRIVER)
1048 #error "missing bus glue for ehci-hcd"
1051 static int __init ehci_hcd_init(void)
1055 pr_debug("%s: block sizes: qh %Zd qtd %Zd itd %Zd sitd %Zd\n",
1057 sizeof(struct ehci_qh), sizeof(struct ehci_qtd),
1058 sizeof(struct ehci_itd), sizeof(struct ehci_sitd));
1061 ehci_debug_root = debugfs_create_dir("ehci", NULL);
1062 if (!ehci_debug_root)
1066 #ifdef PLATFORM_DRIVER
1067 retval = platform_driver_register(&PLATFORM_DRIVER);
1073 retval = pci_register_driver(&PCI_DRIVER);
1078 #ifdef PS3_SYSTEM_BUS_DRIVER
1079 retval = ps3_ehci_driver_register(&PS3_SYSTEM_BUS_DRIVER);
1084 #ifdef OF_PLATFORM_DRIVER
1085 retval = of_register_platform_driver(&OF_PLATFORM_DRIVER);
1091 #ifdef OF_PLATFORM_DRIVER
1092 /* of_unregister_platform_driver(&OF_PLATFORM_DRIVER); */
1095 #ifdef PS3_SYSTEM_BUS_DRIVER
1096 ps3_ehci_driver_unregister(&PS3_SYSTEM_BUS_DRIVER);
1100 pci_unregister_driver(&PCI_DRIVER);
1103 #ifdef PLATFORM_DRIVER
1104 platform_driver_unregister(&PLATFORM_DRIVER);
1108 debugfs_remove(ehci_debug_root);
1109 ehci_debug_root = NULL;
1113 module_init(ehci_hcd_init);
1115 static void __exit ehci_hcd_cleanup(void)
1117 #ifdef OF_PLATFORM_DRIVER
1118 of_unregister_platform_driver(&OF_PLATFORM_DRIVER);
1120 #ifdef PLATFORM_DRIVER
1121 platform_driver_unregister(&PLATFORM_DRIVER);
1124 pci_unregister_driver(&PCI_DRIVER);
1126 #ifdef PS3_SYSTEM_BUS_DRIVER
1127 ps3_ehci_driver_unregister(&PS3_SYSTEM_BUS_DRIVER);
1130 debugfs_remove(ehci_debug_root);
1133 module_exit(ehci_hcd_cleanup);