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/vmalloc.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>
37 #include <linux/debugfs.h>
39 #include "../core/hcd.h"
41 #include <asm/byteorder.h>
44 #include <asm/system.h>
45 #include <asm/unaligned.h>
47 /*-------------------------------------------------------------------------*/
50 * EHCI hc_driver implementation ... experimental, incomplete.
51 * Based on the final 1.0 register interface specification.
53 * USB 2.0 shows up in upcoming www.pcmcia.org technology.
54 * First was PCMCIA, like ISA; then CardBus, which is PCI.
55 * Next comes "CardBay", using USB 2.0 signals.
57 * Contains additional contributions by Brad Hards, Rory Bolt, and others.
58 * Special thanks to Intel and VIA for providing host controllers to
59 * test this driver on, and Cypress (including In-System Design) for
60 * providing early devices for those host controllers to talk to!
63 #define DRIVER_AUTHOR "David Brownell"
64 #define DRIVER_DESC "USB 2.0 'Enhanced' Host Controller (EHCI) Driver"
66 static const char hcd_name [] = "ehci_hcd";
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 #define EHCI_TUNE_FLS 2 /* (small) 256 frame schedule */
84 #define EHCI_IAA_MSECS 10 /* arbitrary */
85 #define EHCI_IO_JIFFIES (HZ/10) /* io watchdog > irq_thresh */
86 #define EHCI_ASYNC_JIFFIES (HZ/20) /* async idle timeout */
87 #define EHCI_SHRINK_FRAMES 5 /* async qh unlink delay */
89 /* Initial IRQ latency: faster than hw default */
90 static int log2_irq_thresh = 0; // 0 to 6
91 module_param (log2_irq_thresh, int, S_IRUGO);
92 MODULE_PARM_DESC (log2_irq_thresh, "log2 IRQ latency, 1-64 microframes");
94 /* initial park setting: slower than hw default */
95 static unsigned park = 0;
96 module_param (park, uint, S_IRUGO);
97 MODULE_PARM_DESC (park, "park setting; 1-3 back-to-back async packets");
99 /* for flakey hardware, ignore overcurrent indicators */
100 static int ignore_oc = 0;
101 module_param (ignore_oc, bool, S_IRUGO);
102 MODULE_PARM_DESC (ignore_oc, "ignore bogus hardware overcurrent indications");
104 #define INTR_MASK (STS_IAA | STS_FATAL | STS_PCD | STS_ERR | STS_INT)
106 /*-------------------------------------------------------------------------*/
109 #include "ehci-dbg.c"
111 /*-------------------------------------------------------------------------*/
114 * handshake - spin reading hc until handshake completes or fails
115 * @ptr: address of hc register to be read
116 * @mask: bits to look at in result of read
117 * @done: value of those bits when handshake succeeds
118 * @usec: timeout in microseconds
120 * Returns negative errno, or zero on success
122 * Success happens when the "mask" bits have the specified value (hardware
123 * handshake done). There are two failure modes: "usec" have passed (major
124 * hardware flakeout), or the register reads as all-ones (hardware removed).
126 * That last failure should_only happen in cases like physical cardbus eject
127 * before driver shutdown. But it also seems to be caused by bugs in cardbus
128 * bridge shutdown: shutting down the bridge before the devices using it.
130 static int handshake (struct ehci_hcd *ehci, void __iomem *ptr,
131 u32 mask, u32 done, int usec)
136 result = ehci_readl(ehci, ptr);
137 if (result == ~(u32)0) /* card removed */
148 /* force HC to halt state from unknown (EHCI spec section 2.3) */
149 static int ehci_halt (struct ehci_hcd *ehci)
151 u32 temp = ehci_readl(ehci, &ehci->regs->status);
153 /* disable any irqs left enabled by previous code */
154 ehci_writel(ehci, 0, &ehci->regs->intr_enable);
156 if ((temp & STS_HALT) != 0)
159 temp = ehci_readl(ehci, &ehci->regs->command);
161 ehci_writel(ehci, temp, &ehci->regs->command);
162 return handshake (ehci, &ehci->regs->status,
163 STS_HALT, STS_HALT, 16 * 125);
166 static int handshake_on_error_set_halt(struct ehci_hcd *ehci, void __iomem *ptr,
167 u32 mask, u32 done, int usec)
171 error = handshake(ehci, ptr, mask, done, usec);
174 ehci_to_hcd(ehci)->state = HC_STATE_HALT;
175 ehci_err(ehci, "force halt; handhake %p %08x %08x -> %d\n",
176 ptr, mask, done, error);
182 /* put TDI/ARC silicon into EHCI mode */
183 static void tdi_reset (struct ehci_hcd *ehci)
185 u32 __iomem *reg_ptr;
188 reg_ptr = (u32 __iomem *)(((u8 __iomem *)ehci->regs) + USBMODE);
189 tmp = ehci_readl(ehci, reg_ptr);
190 tmp |= USBMODE_CM_HC;
191 /* The default byte access to MMR space is LE after
192 * controller reset. Set the required endian mode
193 * for transfer buffers to match the host microprocessor
195 if (ehci_big_endian_mmio(ehci))
197 ehci_writel(ehci, tmp, reg_ptr);
200 /* reset a non-running (STS_HALT == 1) controller */
201 static int ehci_reset (struct ehci_hcd *ehci)
204 u32 command = ehci_readl(ehci, &ehci->regs->command);
206 command |= CMD_RESET;
207 dbg_cmd (ehci, "reset", command);
208 ehci_writel(ehci, command, &ehci->regs->command);
209 ehci_to_hcd(ehci)->state = HC_STATE_HALT;
210 ehci->next_statechange = jiffies;
211 retval = handshake (ehci, &ehci->regs->command,
212 CMD_RESET, 0, 250 * 1000);
217 if (ehci_is_TDI(ehci))
223 /* idle the controller (from running) */
224 static void ehci_quiesce (struct ehci_hcd *ehci)
229 if (!HC_IS_RUNNING (ehci_to_hcd(ehci)->state))
233 /* wait for any schedule enables/disables to take effect */
234 temp = ehci_readl(ehci, &ehci->regs->command) << 10;
235 temp &= STS_ASS | STS_PSS;
236 if (handshake_on_error_set_halt(ehci, &ehci->regs->status,
237 STS_ASS | STS_PSS, temp, 16 * 125))
240 /* then disable anything that's still active */
241 temp = ehci_readl(ehci, &ehci->regs->command);
242 temp &= ~(CMD_ASE | CMD_IAAD | CMD_PSE);
243 ehci_writel(ehci, temp, &ehci->regs->command);
245 /* hardware can take 16 microframes to turn off ... */
246 handshake_on_error_set_halt(ehci, &ehci->regs->status,
247 STS_ASS | STS_PSS, 0, 16 * 125);
250 /*-------------------------------------------------------------------------*/
252 static void end_unlink_async(struct ehci_hcd *ehci);
253 static void ehci_work(struct ehci_hcd *ehci);
255 #include "ehci-hub.c"
256 #include "ehci-mem.c"
258 #include "ehci-sched.c"
260 /*-------------------------------------------------------------------------*/
262 static void ehci_iaa_watchdog(unsigned long param)
264 struct ehci_hcd *ehci = (struct ehci_hcd *) param;
267 spin_lock_irqsave (&ehci->lock, flags);
269 /* Lost IAA irqs wedge things badly; seen first with a vt8235.
270 * So we need this watchdog, but must protect it against both
271 * (a) SMP races against real IAA firing and retriggering, and
272 * (b) clean HC shutdown, when IAA watchdog was pending.
275 && !timer_pending(&ehci->iaa_watchdog)
276 && HC_IS_RUNNING(ehci_to_hcd(ehci)->state)) {
279 /* If we get here, IAA is *REALLY* late. It's barely
280 * conceivable that the system is so busy that CMD_IAAD
281 * is still legitimately set, so let's be sure it's
282 * clear before we read STS_IAA. (The HC should clear
283 * CMD_IAAD when it sets STS_IAA.)
285 cmd = ehci_readl(ehci, &ehci->regs->command);
287 ehci_writel(ehci, cmd & ~CMD_IAAD,
288 &ehci->regs->command);
290 /* If IAA is set here it either legitimately triggered
291 * before we cleared IAAD above (but _way_ late, so we'll
292 * still count it as lost) ... or a silicon erratum:
293 * - VIA seems to set IAA without triggering the IRQ;
294 * - IAAD potentially cleared without setting IAA.
296 status = ehci_readl(ehci, &ehci->regs->status);
297 if ((status & STS_IAA) || !(cmd & CMD_IAAD)) {
298 COUNT (ehci->stats.lost_iaa);
299 ehci_writel(ehci, STS_IAA, &ehci->regs->status);
302 ehci_vdbg(ehci, "IAA watchdog: status %x cmd %x\n",
304 end_unlink_async(ehci);
307 spin_unlock_irqrestore(&ehci->lock, flags);
310 static void ehci_watchdog(unsigned long param)
312 struct ehci_hcd *ehci = (struct ehci_hcd *) param;
315 spin_lock_irqsave(&ehci->lock, flags);
317 /* stop async processing after it's idled a bit */
318 if (test_bit (TIMER_ASYNC_OFF, &ehci->actions))
319 start_unlink_async (ehci, ehci->async);
321 /* ehci could run by timer, without IRQs ... */
324 spin_unlock_irqrestore (&ehci->lock, flags);
327 /* On some systems, leaving remote wakeup enabled prevents system shutdown.
328 * The firmware seems to think that powering off is a wakeup event!
329 * This routine turns off remote wakeup and everything else, on all ports.
331 static void ehci_turn_off_all_ports(struct ehci_hcd *ehci)
333 int port = HCS_N_PORTS(ehci->hcs_params);
336 ehci_writel(ehci, PORT_RWC_BITS,
337 &ehci->regs->port_status[port]);
341 * Halt HC, turn off all ports, and let the BIOS use the companion controllers.
342 * Should be called with ehci->lock held.
344 static void ehci_silence_controller(struct ehci_hcd *ehci)
347 ehci_turn_off_all_ports(ehci);
349 /* make BIOS/etc use companion controller during reboot */
350 ehci_writel(ehci, 0, &ehci->regs->configured_flag);
352 /* unblock posted writes */
353 ehci_readl(ehci, &ehci->regs->configured_flag);
356 /* ehci_shutdown kick in for silicon on any bus (not just pci, etc).
357 * This forcibly disables dma and IRQs, helping kexec and other cases
358 * where the next system software may expect clean state.
360 static void ehci_shutdown(struct usb_hcd *hcd)
362 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
364 del_timer_sync(&ehci->watchdog);
365 del_timer_sync(&ehci->iaa_watchdog);
367 spin_lock_irq(&ehci->lock);
368 ehci_silence_controller(ehci);
369 spin_unlock_irq(&ehci->lock);
372 static void ehci_port_power (struct ehci_hcd *ehci, int is_on)
376 if (!HCS_PPC (ehci->hcs_params))
379 ehci_dbg (ehci, "...power%s ports...\n", is_on ? "up" : "down");
380 for (port = HCS_N_PORTS (ehci->hcs_params); port > 0; )
381 (void) ehci_hub_control(ehci_to_hcd(ehci),
382 is_on ? SetPortFeature : ClearPortFeature,
385 /* Flush those writes */
386 ehci_readl(ehci, &ehci->regs->command);
390 /*-------------------------------------------------------------------------*/
393 * ehci_work is called from some interrupts, timers, and so on.
394 * it calls driver completion functions, after dropping ehci->lock.
396 static void ehci_work (struct ehci_hcd *ehci)
398 timer_action_done (ehci, TIMER_IO_WATCHDOG);
400 /* another CPU may drop ehci->lock during a schedule scan while
401 * it reports urb completions. this flag guards against bogus
402 * attempts at re-entrant schedule scanning.
408 if (ehci->next_uframe != -1)
409 scan_periodic (ehci);
412 /* the IO watchdog guards against hardware or driver bugs that
413 * misplace IRQs, and should let us run completely without IRQs.
414 * such lossage has been observed on both VT6202 and VT8235.
416 if (HC_IS_RUNNING (ehci_to_hcd(ehci)->state) &&
417 (ehci->async->qh_next.ptr != NULL ||
418 ehci->periodic_sched != 0))
419 timer_action (ehci, TIMER_IO_WATCHDOG);
423 * Called when the ehci_hcd module is removed.
425 static void ehci_stop (struct usb_hcd *hcd)
427 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
429 ehci_dbg (ehci, "stop\n");
431 /* no more interrupts ... */
432 del_timer_sync (&ehci->watchdog);
433 del_timer_sync(&ehci->iaa_watchdog);
435 spin_lock_irq(&ehci->lock);
436 if (HC_IS_RUNNING (hcd->state))
439 ehci_silence_controller(ehci);
441 spin_unlock_irq(&ehci->lock);
443 remove_companion_file(ehci);
444 remove_debug_files (ehci);
446 /* root hub is shut down separately (first, when possible) */
447 spin_lock_irq (&ehci->lock);
450 spin_unlock_irq (&ehci->lock);
451 ehci_mem_cleanup (ehci);
454 ehci_dbg (ehci, "irq normal %ld err %ld reclaim %ld (lost %ld)\n",
455 ehci->stats.normal, ehci->stats.error, ehci->stats.reclaim,
456 ehci->stats.lost_iaa);
457 ehci_dbg (ehci, "complete %ld unlink %ld\n",
458 ehci->stats.complete, ehci->stats.unlink);
461 dbg_status (ehci, "ehci_stop completed",
462 ehci_readl(ehci, &ehci->regs->status));
465 /* one-time init, only for memory state */
466 static int ehci_init(struct usb_hcd *hcd)
468 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
473 spin_lock_init(&ehci->lock);
475 init_timer(&ehci->watchdog);
476 ehci->watchdog.function = ehci_watchdog;
477 ehci->watchdog.data = (unsigned long) ehci;
479 init_timer(&ehci->iaa_watchdog);
480 ehci->iaa_watchdog.function = ehci_iaa_watchdog;
481 ehci->iaa_watchdog.data = (unsigned long) ehci;
484 * hw default: 1K periodic list heads, one per frame.
485 * periodic_size can shrink by USBCMD update if hcc_params allows.
487 ehci->periodic_size = DEFAULT_I_TDPS;
488 if ((retval = ehci_mem_init(ehci, GFP_KERNEL)) < 0)
491 /* controllers may cache some of the periodic schedule ... */
492 hcc_params = ehci_readl(ehci, &ehci->caps->hcc_params);
493 if (HCC_ISOC_CACHE(hcc_params)) // full frame cache
495 else // N microframes cached
496 ehci->i_thresh = 2 + HCC_ISOC_THRES(hcc_params);
498 ehci->reclaim = NULL;
499 ehci->next_uframe = -1;
502 * dedicate a qh for the async ring head, since we couldn't unlink
503 * a 'real' qh without stopping the async schedule [4.8]. use it
504 * as the 'reclamation list head' too.
505 * its dummy is used in hw_alt_next of many tds, to prevent the qh
506 * from automatically advancing to the next td after short reads.
508 ehci->async->qh_next.qh = NULL;
509 ehci->async->hw_next = QH_NEXT(ehci, ehci->async->qh_dma);
510 ehci->async->hw_info1 = cpu_to_hc32(ehci, QH_HEAD);
511 ehci->async->hw_token = cpu_to_hc32(ehci, QTD_STS_HALT);
512 ehci->async->hw_qtd_next = EHCI_LIST_END(ehci);
513 ehci->async->qh_state = QH_STATE_LINKED;
514 ehci->async->hw_alt_next = QTD_NEXT(ehci, ehci->async->dummy->qtd_dma);
516 /* clear interrupt enables, set irq latency */
517 if (log2_irq_thresh < 0 || log2_irq_thresh > 6)
519 temp = 1 << (16 + log2_irq_thresh);
520 if (HCC_CANPARK(hcc_params)) {
521 /* HW default park == 3, on hardware that supports it (like
522 * NVidia and ALI silicon), maximizes throughput on the async
523 * schedule by avoiding QH fetches between transfers.
525 * With fast usb storage devices and NForce2, "park" seems to
526 * make problems: throughput reduction (!), data errors...
529 park = min(park, (unsigned) 3);
533 ehci_dbg(ehci, "park %d\n", park);
535 if (HCC_PGM_FRAMELISTLEN(hcc_params)) {
536 /* periodic schedule size can be smaller than default */
538 temp |= (EHCI_TUNE_FLS << 2);
539 switch (EHCI_TUNE_FLS) {
540 case 0: ehci->periodic_size = 1024; break;
541 case 1: ehci->periodic_size = 512; break;
542 case 2: ehci->periodic_size = 256; break;
546 ehci->command = temp;
551 /* start HC running; it's halted, ehci_init() has been run (once) */
552 static int ehci_run (struct usb_hcd *hcd)
554 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
559 hcd->uses_new_polling = 1;
562 /* EHCI spec section 4.1 */
563 if ((retval = ehci_reset(ehci)) != 0) {
564 ehci_mem_cleanup(ehci);
567 ehci_writel(ehci, ehci->periodic_dma, &ehci->regs->frame_list);
568 ehci_writel(ehci, (u32)ehci->async->qh_dma, &ehci->regs->async_next);
571 * hcc_params controls whether ehci->regs->segment must (!!!)
572 * be used; it constrains QH/ITD/SITD and QTD locations.
573 * pci_pool consistent memory always uses segment zero.
574 * streaming mappings for I/O buffers, like pci_map_single(),
575 * can return segments above 4GB, if the device allows.
577 * NOTE: the dma mask is visible through dma_supported(), so
578 * drivers can pass this info along ... like NETIF_F_HIGHDMA,
579 * Scsi_Host.highmem_io, and so forth. It's readonly to all
580 * host side drivers though.
582 hcc_params = ehci_readl(ehci, &ehci->caps->hcc_params);
583 if (HCC_64BIT_ADDR(hcc_params)) {
584 ehci_writel(ehci, 0, &ehci->regs->segment);
586 // this is deeply broken on almost all architectures
587 if (!dma_set_mask(hcd->self.controller, DMA_64BIT_MASK))
588 ehci_info(ehci, "enabled 64bit DMA\n");
593 // Philips, Intel, and maybe others need CMD_RUN before the
594 // root hub will detect new devices (why?); NEC doesn't
595 ehci->command &= ~(CMD_LRESET|CMD_IAAD|CMD_PSE|CMD_ASE|CMD_RESET);
596 ehci->command |= CMD_RUN;
597 ehci_writel(ehci, ehci->command, &ehci->regs->command);
598 dbg_cmd (ehci, "init", ehci->command);
601 * Start, enabling full USB 2.0 functionality ... usb 1.1 devices
602 * are explicitly handed to companion controller(s), so no TT is
603 * involved with the root hub. (Except where one is integrated,
604 * and there's no companion controller unless maybe for USB OTG.)
606 * Turning on the CF flag will transfer ownership of all ports
607 * from the companions to the EHCI controller. If any of the
608 * companions are in the middle of a port reset at the time, it
609 * could cause trouble. Write-locking ehci_cf_port_reset_rwsem
610 * guarantees that no resets are in progress. After we set CF,
611 * a short delay lets the hardware catch up; new resets shouldn't
612 * be started before the port switching actions could complete.
614 down_write(&ehci_cf_port_reset_rwsem);
615 hcd->state = HC_STATE_RUNNING;
616 ehci_writel(ehci, FLAG_CF, &ehci->regs->configured_flag);
617 ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
619 up_write(&ehci_cf_port_reset_rwsem);
621 temp = HC_VERSION(ehci_readl(ehci, &ehci->caps->hc_capbase));
623 "USB %x.%x started, EHCI %x.%02x%s\n",
624 ((ehci->sbrn & 0xf0)>>4), (ehci->sbrn & 0x0f),
625 temp >> 8, temp & 0xff,
626 ignore_oc ? ", overcurrent ignored" : "");
628 ehci_writel(ehci, INTR_MASK,
629 &ehci->regs->intr_enable); /* Turn On Interrupts */
631 /* GRR this is run-once init(), being done every time the HC starts.
632 * So long as they're part of class devices, we can't do it init()
633 * since the class device isn't created that early.
635 create_debug_files(ehci);
636 create_companion_file(ehci);
641 /*-------------------------------------------------------------------------*/
643 static irqreturn_t ehci_irq (struct usb_hcd *hcd)
645 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
646 u32 status, masked_status, pcd_status = 0, cmd;
649 spin_lock (&ehci->lock);
651 status = ehci_readl(ehci, &ehci->regs->status);
653 /* e.g. cardbus physical eject */
654 if (status == ~(u32) 0) {
655 ehci_dbg (ehci, "device removed\n");
659 masked_status = status & INTR_MASK;
660 if (!masked_status) { /* irq sharing? */
661 spin_unlock(&ehci->lock);
665 /* clear (just) interrupts */
666 ehci_writel(ehci, masked_status, &ehci->regs->status);
667 cmd = ehci_readl(ehci, &ehci->regs->command);
671 /* unrequested/ignored: Frame List Rollover */
672 dbg_status (ehci, "irq", status);
675 /* INT, ERR, and IAA interrupt rates can be throttled */
677 /* normal [4.15.1.2] or error [4.15.1.1] completion */
678 if (likely ((status & (STS_INT|STS_ERR)) != 0)) {
679 if (likely ((status & STS_ERR) == 0))
680 COUNT (ehci->stats.normal);
682 COUNT (ehci->stats.error);
686 /* complete the unlinking of some qh [4.15.2.3] */
687 if (status & STS_IAA) {
688 /* guard against (alleged) silicon errata */
689 if (cmd & CMD_IAAD) {
690 ehci_writel(ehci, cmd & ~CMD_IAAD,
691 &ehci->regs->command);
692 ehci_dbg(ehci, "IAA with IAAD still set?\n");
695 COUNT(ehci->stats.reclaim);
696 end_unlink_async(ehci);
698 ehci_dbg(ehci, "IAA with nothing to reclaim?\n");
701 /* remote wakeup [4.3.1] */
702 if (status & STS_PCD) {
703 unsigned i = HCS_N_PORTS (ehci->hcs_params);
705 /* kick root hub later */
708 /* resume root hub? */
709 if (!(cmd & CMD_RUN))
710 usb_hcd_resume_root_hub(hcd);
713 int pstatus = ehci_readl(ehci,
714 &ehci->regs->port_status [i]);
716 if (pstatus & PORT_OWNER)
718 if (!(test_bit(i, &ehci->suspended_ports) &&
719 ((pstatus & PORT_RESUME) ||
720 !(pstatus & PORT_SUSPEND)) &&
721 (pstatus & PORT_PE) &&
722 ehci->reset_done[i] == 0))
725 /* start 20 msec resume signaling from this port,
726 * and make khubd collect PORT_STAT_C_SUSPEND to
727 * stop that signaling.
729 ehci->reset_done [i] = jiffies + msecs_to_jiffies (20);
730 ehci_dbg (ehci, "port %d remote wakeup\n", i + 1);
731 mod_timer(&hcd->rh_timer, ehci->reset_done[i]);
735 /* PCI errors [4.15.2.4] */
736 if (unlikely ((status & STS_FATAL) != 0)) {
737 ehci_err(ehci, "fatal error\n");
738 dbg_cmd(ehci, "fatal", cmd);
739 dbg_status(ehci, "fatal", status);
743 ehci_writel(ehci, 0, &ehci->regs->configured_flag);
744 /* generic layer kills/unlinks all urbs, then
745 * uses ehci_stop to clean up the rest
752 spin_unlock (&ehci->lock);
754 usb_hcd_poll_rh_status(hcd);
758 /*-------------------------------------------------------------------------*/
761 * non-error returns are a promise to giveback() the urb later
762 * we drop ownership so next owner (or urb unlink) can get it
764 * urb + dev is in hcd.self.controller.urb_list
765 * we're queueing TDs onto software and hardware lists
767 * hcd-specific init for hcpriv hasn't been done yet
769 * NOTE: control, bulk, and interrupt share the same code to append TDs
770 * to a (possibly active) QH, and the same QH scanning code.
772 static int ehci_urb_enqueue (
777 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
778 struct list_head qtd_list;
780 INIT_LIST_HEAD (&qtd_list);
782 switch (usb_pipetype (urb->pipe)) {
784 /* qh_completions() code doesn't handle all the fault cases
785 * in multi-TD control transfers. Even 1KB is rare anyway.
787 if (urb->transfer_buffer_length > (16 * 1024))
790 /* case PIPE_BULK: */
792 if (!qh_urb_transaction (ehci, urb, &qtd_list, mem_flags))
794 return submit_async(ehci, urb, &qtd_list, mem_flags);
797 if (!qh_urb_transaction (ehci, urb, &qtd_list, mem_flags))
799 return intr_submit(ehci, urb, &qtd_list, mem_flags);
801 case PIPE_ISOCHRONOUS:
802 if (urb->dev->speed == USB_SPEED_HIGH)
803 return itd_submit (ehci, urb, mem_flags);
805 return sitd_submit (ehci, urb, mem_flags);
809 static void unlink_async (struct ehci_hcd *ehci, struct ehci_qh *qh)
812 if (!HC_IS_RUNNING(ehci_to_hcd(ehci)->state) && ehci->reclaim)
813 end_unlink_async(ehci);
815 /* if it's not linked then there's nothing to do */
816 if (qh->qh_state != QH_STATE_LINKED)
819 /* defer till later if busy */
820 else if (ehci->reclaim) {
821 struct ehci_qh *last;
823 for (last = ehci->reclaim;
825 last = last->reclaim)
827 qh->qh_state = QH_STATE_UNLINK_WAIT;
830 /* start IAA cycle */
832 start_unlink_async (ehci, qh);
835 /* remove from hardware lists
836 * completions normally happen asynchronously
839 static int ehci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
841 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
846 spin_lock_irqsave (&ehci->lock, flags);
847 rc = usb_hcd_check_unlink_urb(hcd, urb, status);
851 switch (usb_pipetype (urb->pipe)) {
852 // case PIPE_CONTROL:
855 qh = (struct ehci_qh *) urb->hcpriv;
858 switch (qh->qh_state) {
859 case QH_STATE_LINKED:
860 case QH_STATE_COMPLETING:
861 unlink_async(ehci, qh);
863 case QH_STATE_UNLINK:
864 case QH_STATE_UNLINK_WAIT:
865 /* already started */
874 qh = (struct ehci_qh *) urb->hcpriv;
877 switch (qh->qh_state) {
878 case QH_STATE_LINKED:
879 intr_deschedule (ehci, qh);
882 qh_completions (ehci, qh);
885 ehci_dbg (ehci, "bogus qh %p state %d\n",
890 /* reschedule QH iff another request is queued */
891 if (!list_empty (&qh->qtd_list)
892 && HC_IS_RUNNING (hcd->state)) {
893 rc = qh_schedule(ehci, qh);
895 /* An error here likely indicates handshake failure
896 * or no space left in the schedule. Neither fault
897 * should happen often ...
899 * FIXME kill the now-dysfunctional queued urbs
903 "can't reschedule qh %p, err %d",
908 case PIPE_ISOCHRONOUS:
911 // wait till next completion, do it then.
912 // completion irqs can wait up to 1024 msec,
916 spin_unlock_irqrestore (&ehci->lock, flags);
920 /*-------------------------------------------------------------------------*/
922 // bulk qh holds the data toggle
925 ehci_endpoint_disable (struct usb_hcd *hcd, struct usb_host_endpoint *ep)
927 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
929 struct ehci_qh *qh, *tmp;
931 /* ASSERT: any requests/urbs are being unlinked */
932 /* ASSERT: nobody can be submitting urbs for this any more */
935 spin_lock_irqsave (&ehci->lock, flags);
940 /* endpoints can be iso streams. for now, we don't
941 * accelerate iso completions ... so spin a while.
943 if (qh->hw_info1 == 0) {
944 ehci_vdbg (ehci, "iso delay\n");
948 if (!HC_IS_RUNNING (hcd->state))
949 qh->qh_state = QH_STATE_IDLE;
950 switch (qh->qh_state) {
951 case QH_STATE_LINKED:
952 for (tmp = ehci->async->qh_next.qh;
954 tmp = tmp->qh_next.qh)
956 /* periodic qh self-unlinks on empty */
959 unlink_async (ehci, qh);
961 case QH_STATE_UNLINK: /* wait for hw to finish? */
962 case QH_STATE_UNLINK_WAIT:
964 spin_unlock_irqrestore (&ehci->lock, flags);
965 schedule_timeout_uninterruptible(1);
967 case QH_STATE_IDLE: /* fully unlinked */
968 if (list_empty (&qh->qtd_list)) {
972 /* else FALL THROUGH */
975 /* caller was supposed to have unlinked any requests;
976 * that's not our job. just leak this memory.
978 ehci_err (ehci, "qh %p (#%02x) state %d%s\n",
979 qh, ep->desc.bEndpointAddress, qh->qh_state,
980 list_empty (&qh->qtd_list) ? "" : "(has tds)");
985 spin_unlock_irqrestore (&ehci->lock, flags);
989 static int ehci_get_frame (struct usb_hcd *hcd)
991 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
992 return (ehci_readl(ehci, &ehci->regs->frame_index) >> 3) %
996 /*-------------------------------------------------------------------------*/
998 MODULE_DESCRIPTION(DRIVER_DESC);
999 MODULE_AUTHOR (DRIVER_AUTHOR);
1000 MODULE_LICENSE ("GPL");
1003 #include "ehci-pci.c"
1004 #define PCI_DRIVER ehci_pci_driver
1007 #ifdef CONFIG_USB_EHCI_FSL
1008 #include "ehci-fsl.c"
1009 #define PLATFORM_DRIVER ehci_fsl_driver
1012 #ifdef CONFIG_SOC_AU1200
1013 #include "ehci-au1xxx.c"
1014 #define PLATFORM_DRIVER ehci_hcd_au1xxx_driver
1017 #ifdef CONFIG_PPC_PS3
1018 #include "ehci-ps3.c"
1019 #define PS3_SYSTEM_BUS_DRIVER ps3_ehci_driver
1022 #ifdef CONFIG_USB_EHCI_HCD_PPC_OF
1023 #include "ehci-ppc-of.c"
1024 #define OF_PLATFORM_DRIVER ehci_hcd_ppc_of_driver
1027 #ifdef CONFIG_PLAT_ORION
1028 #include "ehci-orion.c"
1029 #define PLATFORM_DRIVER ehci_orion_driver
1032 #ifdef CONFIG_ARCH_IXP4XX
1033 #include "ehci-ixp4xx.c"
1034 #define PLATFORM_DRIVER ixp4xx_ehci_driver
1037 #if !defined(PCI_DRIVER) && !defined(PLATFORM_DRIVER) && \
1038 !defined(PS3_SYSTEM_BUS_DRIVER) && !defined(OF_PLATFORM_DRIVER)
1039 #error "missing bus glue for ehci-hcd"
1042 static int __init ehci_hcd_init(void)
1049 printk(KERN_INFO "%s: " DRIVER_DESC "\n", hcd_name);
1050 set_bit(USB_EHCI_LOADED, &usb_hcds_loaded);
1051 if (test_bit(USB_UHCI_LOADED, &usb_hcds_loaded) ||
1052 test_bit(USB_OHCI_LOADED, &usb_hcds_loaded))
1053 printk(KERN_WARNING "Warning! ehci_hcd should always be loaded"
1054 " before uhci_hcd and ohci_hcd, not after\n");
1056 pr_debug("%s: block sizes: qh %Zd qtd %Zd itd %Zd sitd %Zd\n",
1058 sizeof(struct ehci_qh), sizeof(struct ehci_qtd),
1059 sizeof(struct ehci_itd), sizeof(struct ehci_sitd));
1062 ehci_debug_root = debugfs_create_dir("ehci", NULL);
1063 if (!ehci_debug_root) {
1069 #ifdef PLATFORM_DRIVER
1070 retval = platform_driver_register(&PLATFORM_DRIVER);
1076 retval = pci_register_driver(&PCI_DRIVER);
1081 #ifdef PS3_SYSTEM_BUS_DRIVER
1082 retval = ps3_ehci_driver_register(&PS3_SYSTEM_BUS_DRIVER);
1087 #ifdef OF_PLATFORM_DRIVER
1088 retval = of_register_platform_driver(&OF_PLATFORM_DRIVER);
1094 #ifdef OF_PLATFORM_DRIVER
1095 /* of_unregister_platform_driver(&OF_PLATFORM_DRIVER); */
1098 #ifdef PS3_SYSTEM_BUS_DRIVER
1099 ps3_ehci_driver_unregister(&PS3_SYSTEM_BUS_DRIVER);
1103 pci_unregister_driver(&PCI_DRIVER);
1106 #ifdef PLATFORM_DRIVER
1107 platform_driver_unregister(&PLATFORM_DRIVER);
1111 debugfs_remove(ehci_debug_root);
1112 ehci_debug_root = NULL;
1115 clear_bit(USB_EHCI_LOADED, &usb_hcds_loaded);
1118 module_init(ehci_hcd_init);
1120 static void __exit ehci_hcd_cleanup(void)
1122 #ifdef OF_PLATFORM_DRIVER
1123 of_unregister_platform_driver(&OF_PLATFORM_DRIVER);
1125 #ifdef PLATFORM_DRIVER
1126 platform_driver_unregister(&PLATFORM_DRIVER);
1129 pci_unregister_driver(&PCI_DRIVER);
1131 #ifdef PS3_SYSTEM_BUS_DRIVER
1132 ps3_ehci_driver_unregister(&PS3_SYSTEM_BUS_DRIVER);
1135 debugfs_remove(ehci_debug_root);
1137 clear_bit(USB_EHCI_LOADED, &usb_hcds_loaded);
1139 module_exit(ehci_hcd_cleanup);