2 * Universal Host Controller Interface driver for USB.
4 * Maintainer: Alan Stern <stern@rowland.harvard.edu>
6 * (C) Copyright 1999 Linus Torvalds
7 * (C) Copyright 1999-2002 Johannes Erdfelt, johannes@erdfelt.com
8 * (C) Copyright 1999 Randy Dunlap
9 * (C) Copyright 1999 Georg Acher, acher@in.tum.de
10 * (C) Copyright 1999 Deti Fliegl, deti@fliegl.de
11 * (C) Copyright 1999 Thomas Sailer, sailer@ife.ee.ethz.ch
12 * (C) Copyright 1999 Roman Weissgaerber, weissg@vienna.at
13 * (C) Copyright 2000 Yggdrasil Computing, Inc. (port of new PCI interface
14 * support from usb-ohci.c by Adam Richter, adam@yggdrasil.com).
15 * (C) Copyright 1999 Gregory P. Smith (from usb-ohci.c)
16 * (C) Copyright 2004-2007 Alan Stern, stern@rowland.harvard.edu
18 * Intel documents this fairly well, and as far as I know there
19 * are no royalties or anything like that, but even so there are
20 * people who decided that they want to do the same thing in a
21 * completely different way.
25 #include <linux/module.h>
26 #include <linux/pci.h>
27 #include <linux/kernel.h>
28 #include <linux/init.h>
29 #include <linux/delay.h>
30 #include <linux/ioport.h>
31 #include <linux/slab.h>
32 #include <linux/errno.h>
33 #include <linux/unistd.h>
34 #include <linux/interrupt.h>
35 #include <linux/spinlock.h>
36 #include <linux/debugfs.h>
38 #include <linux/dmapool.h>
39 #include <linux/dma-mapping.h>
40 #include <linux/usb.h>
41 #include <linux/bitops.h>
42 #include <linux/dmi.h>
44 #include <asm/uaccess.h>
47 #include <asm/system.h>
49 #include "../core/hcd.h"
51 #include "pci-quirks.h"
56 #define DRIVER_VERSION "v3.0"
57 #define DRIVER_AUTHOR "Linus 'Frodo Rabbit' Torvalds, Johannes Erdfelt, \
58 Randy Dunlap, Georg Acher, Deti Fliegl, Thomas Sailer, Roman Weissgaerber, \
60 #define DRIVER_DESC "USB Universal Host Controller Interface driver"
62 /* for flakey hardware, ignore overcurrent indicators */
64 module_param(ignore_oc, bool, S_IRUGO);
65 MODULE_PARM_DESC(ignore_oc, "ignore hardware overcurrent indications");
68 * debug = 0, no debugging messages
69 * debug = 1, dump failed URBs except for stalls
70 * debug = 2, dump all failed URBs (including stalls)
71 * show all queues in /debug/uhci/[pci_addr]
72 * debug = 3, show all TDs in URBs when dumping
75 #define DEBUG_CONFIGURED 1
77 module_param(debug, int, S_IRUGO | S_IWUSR);
78 MODULE_PARM_DESC(debug, "Debug level");
81 #define DEBUG_CONFIGURED 0
86 #define ERRBUF_LEN (32 * 1024)
88 static struct kmem_cache *uhci_up_cachep; /* urb_priv */
90 static void suspend_rh(struct uhci_hcd *uhci, enum uhci_rh_state new_state);
91 static void wakeup_rh(struct uhci_hcd *uhci);
92 static void uhci_get_current_frame_number(struct uhci_hcd *uhci);
95 * Calculate the link pointer DMA value for the first Skeleton QH in a frame.
97 static __le32 uhci_frame_skel_link(struct uhci_hcd *uhci, int frame)
102 * The interrupt queues will be interleaved as evenly as possible.
103 * There's not much to be done about period-1 interrupts; they have
104 * to occur in every frame. But we can schedule period-2 interrupts
105 * in odd-numbered frames, period-4 interrupts in frames congruent
106 * to 2 (mod 4), and so on. This way each frame only has two
107 * interrupt QHs, which will help spread out bandwidth utilization.
109 * ffs (Find First bit Set) does exactly what we need:
110 * 1,3,5,... => ffs = 0 => use period-2 QH = skelqh[8],
111 * 2,6,10,... => ffs = 1 => use period-4 QH = skelqh[7], etc.
112 * ffs >= 7 => not on any high-period queue, so use
113 * period-1 QH = skelqh[9].
114 * Add in UHCI_NUMFRAMES to insure at least one bit is set.
116 skelnum = 8 - (int) __ffs(frame | UHCI_NUMFRAMES);
119 return LINK_TO_QH(uhci->skelqh[skelnum]);
122 #include "uhci-debug.c"
124 #include "uhci-hub.c"
127 * Finish up a host controller reset and update the recorded state.
129 static void finish_reset(struct uhci_hcd *uhci)
133 /* HCRESET doesn't affect the Suspend, Reset, and Resume Detect
134 * bits in the port status and control registers.
135 * We have to clear them by hand.
137 for (port = 0; port < uhci->rh_numports; ++port)
138 outw(0, uhci->io_addr + USBPORTSC1 + (port * 2));
140 uhci->port_c_suspend = uhci->resuming_ports = 0;
141 uhci->rh_state = UHCI_RH_RESET;
142 uhci->is_stopped = UHCI_IS_STOPPED;
143 uhci_to_hcd(uhci)->state = HC_STATE_HALT;
144 uhci_to_hcd(uhci)->poll_rh = 0;
146 uhci->dead = 0; /* Full reset resurrects the controller */
150 * Last rites for a defunct/nonfunctional controller
151 * or one we don't want to use any more.
153 static void uhci_hc_died(struct uhci_hcd *uhci)
155 uhci_get_current_frame_number(uhci);
156 uhci_reset_hc(to_pci_dev(uhci_dev(uhci)), uhci->io_addr);
160 /* The current frame may already be partway finished */
161 ++uhci->frame_number;
165 * Initialize a controller that was newly discovered or has lost power
166 * or otherwise been reset while it was suspended. In none of these cases
167 * can we be sure of its previous state.
169 static void check_and_reset_hc(struct uhci_hcd *uhci)
171 if (uhci_check_and_reset_hc(to_pci_dev(uhci_dev(uhci)), uhci->io_addr))
176 * Store the basic register settings needed by the controller.
178 static void configure_hc(struct uhci_hcd *uhci)
180 /* Set the frame length to the default: 1 ms exactly */
181 outb(USBSOF_DEFAULT, uhci->io_addr + USBSOF);
183 /* Store the frame list base address */
184 outl(uhci->frame_dma_handle, uhci->io_addr + USBFLBASEADD);
186 /* Set the current frame number */
187 outw(uhci->frame_number & UHCI_MAX_SOF_NUMBER,
188 uhci->io_addr + USBFRNUM);
190 /* Mark controller as not halted before we enable interrupts */
191 uhci_to_hcd(uhci)->state = HC_STATE_SUSPENDED;
195 pci_write_config_word(to_pci_dev(uhci_dev(uhci)), USBLEGSUP,
200 static int resume_detect_interrupts_are_broken(struct uhci_hcd *uhci)
204 /* If we have to ignore overcurrent events then almost by definition
205 * we can't depend on resume-detect interrupts. */
209 switch (to_pci_dev(uhci_dev(uhci))->vendor) {
213 case PCI_VENDOR_ID_GENESYS:
214 /* Genesys Logic's GL880S controllers don't generate
215 * resume-detect interrupts.
219 case PCI_VENDOR_ID_INTEL:
220 /* Some of Intel's USB controllers have a bug that causes
221 * resume-detect interrupts if any port has an over-current
222 * condition. To make matters worse, some motherboards
223 * hardwire unused USB ports' over-current inputs active!
224 * To prevent problems, we will not enable resume-detect
225 * interrupts if any ports are OC.
227 for (port = 0; port < uhci->rh_numports; ++port) {
228 if (inw(uhci->io_addr + USBPORTSC1 + port * 2) &
237 static int global_suspend_mode_is_broken(struct uhci_hcd *uhci)
240 const char *sys_info;
241 static char bad_Asus_board[] = "A7V8X";
243 /* One of Asus's motherboards has a bug which causes it to
244 * wake up immediately from suspend-to-RAM if any of the ports
245 * are connected. In such cases we will not set EGSM.
247 sys_info = dmi_get_system_info(DMI_BOARD_NAME);
248 if (sys_info && !strcmp(sys_info, bad_Asus_board)) {
249 for (port = 0; port < uhci->rh_numports; ++port) {
250 if (inw(uhci->io_addr + USBPORTSC1 + port * 2) &
259 static void suspend_rh(struct uhci_hcd *uhci, enum uhci_rh_state new_state)
260 __releases(uhci->lock)
261 __acquires(uhci->lock)
264 int int_enable, egsm_enable, wakeup_enable;
265 struct usb_device *rhdev = uhci_to_hcd(uhci)->self.root_hub;
267 auto_stop = (new_state == UHCI_RH_AUTO_STOPPED);
268 dev_dbg(&rhdev->dev, "%s%s\n", __func__,
269 (auto_stop ? " (auto-stop)" : ""));
271 /* Start off by assuming Resume-Detect interrupts and EGSM work
272 * and that remote wakeups should be enabled.
274 egsm_enable = USBCMD_EGSM;
276 int_enable = USBINTR_RESUME;
279 /* In auto-stop mode wakeups must always be detected, but
280 * Resume-Detect interrupts may be prohibited. (In the absence
281 * of CONFIG_PM, they are always disallowed.)
284 if (!device_may_wakeup(&rhdev->dev))
287 /* In bus-suspend mode wakeups may be disabled, but if they are
288 * allowed then so are Resume-Detect interrupts.
292 if (!rhdev->do_remote_wakeup)
297 /* EGSM causes the root hub to echo a 'K' signal (resume) out any
298 * port which requests a remote wakeup. According to the USB spec,
299 * every hub is supposed to do this. But if we are ignoring
300 * remote-wakeup requests anyway then there's no point to it.
301 * We also shouldn't enable EGSM if it's broken.
303 if (!wakeup_enable || global_suspend_mode_is_broken(uhci))
306 /* If we're ignoring wakeup events then there's no reason to
307 * enable Resume-Detect interrupts. We also shouldn't enable
308 * them if they are broken or disallowed.
310 * This logic may lead us to enabling RD but not EGSM. The UHCI
311 * spec foolishly says that RD works only when EGSM is on, but
312 * there's no harm in enabling it anyway -- perhaps some chips
315 if (!wakeup_enable || resume_detect_interrupts_are_broken(uhci) ||
317 uhci->RD_enable = int_enable = 0;
319 outw(int_enable, uhci->io_addr + USBINTR);
320 outw(egsm_enable | USBCMD_CF, uhci->io_addr + USBCMD);
324 /* If we're auto-stopping then no devices have been attached
325 * for a while, so there shouldn't be any active URBs and the
326 * controller should stop after a few microseconds. Otherwise
327 * we will give the controller one frame to stop.
329 if (!auto_stop && !(inw(uhci->io_addr + USBSTS) & USBSTS_HCH)) {
330 uhci->rh_state = UHCI_RH_SUSPENDING;
331 spin_unlock_irq(&uhci->lock);
333 spin_lock_irq(&uhci->lock);
337 if (!(inw(uhci->io_addr + USBSTS) & USBSTS_HCH))
338 dev_warn(uhci_dev(uhci), "Controller not stopped yet!\n");
340 uhci_get_current_frame_number(uhci);
342 uhci->rh_state = new_state;
343 uhci->is_stopped = UHCI_IS_STOPPED;
345 /* If interrupts don't work and remote wakeup is enabled then
346 * the suspended root hub needs to be polled.
348 uhci_to_hcd(uhci)->poll_rh = (!int_enable && wakeup_enable);
350 uhci_scan_schedule(uhci);
354 static void start_rh(struct uhci_hcd *uhci)
356 uhci_to_hcd(uhci)->state = HC_STATE_RUNNING;
357 uhci->is_stopped = 0;
359 /* Mark it configured and running with a 64-byte max packet.
360 * All interrupts are enabled, even though RESUME won't do anything.
362 outw(USBCMD_RS | USBCMD_CF | USBCMD_MAXP, uhci->io_addr + USBCMD);
363 outw(USBINTR_TIMEOUT | USBINTR_RESUME | USBINTR_IOC | USBINTR_SP,
364 uhci->io_addr + USBINTR);
366 uhci->rh_state = UHCI_RH_RUNNING;
367 uhci_to_hcd(uhci)->poll_rh = 1;
370 static void wakeup_rh(struct uhci_hcd *uhci)
371 __releases(uhci->lock)
372 __acquires(uhci->lock)
374 dev_dbg(&uhci_to_hcd(uhci)->self.root_hub->dev,
376 uhci->rh_state == UHCI_RH_AUTO_STOPPED ?
377 " (auto-start)" : "");
379 /* If we are auto-stopped then no devices are attached so there's
380 * no need for wakeup signals. Otherwise we send Global Resume
383 if (uhci->rh_state == UHCI_RH_SUSPENDED) {
386 /* Keep EGSM on if it was set before */
387 egsm = inw(uhci->io_addr + USBCMD) & USBCMD_EGSM;
388 uhci->rh_state = UHCI_RH_RESUMING;
389 outw(USBCMD_FGR | USBCMD_CF | egsm, uhci->io_addr + USBCMD);
390 spin_unlock_irq(&uhci->lock);
392 spin_lock_irq(&uhci->lock);
396 /* End Global Resume and wait for EOP to be sent */
397 outw(USBCMD_CF, uhci->io_addr + USBCMD);
400 if (inw(uhci->io_addr + USBCMD) & USBCMD_FGR)
401 dev_warn(uhci_dev(uhci), "FGR not stopped yet!\n");
406 /* Restart root hub polling */
407 mod_timer(&uhci_to_hcd(uhci)->rh_timer, jiffies);
410 static irqreturn_t uhci_irq(struct usb_hcd *hcd)
412 struct uhci_hcd *uhci = hcd_to_uhci(hcd);
413 unsigned short status;
416 * Read the interrupt status, and write it back to clear the
417 * interrupt cause. Contrary to the UHCI specification, the
418 * "HC Halted" status bit is persistent: it is RO, not R/WC.
420 status = inw(uhci->io_addr + USBSTS);
421 if (!(status & ~USBSTS_HCH)) /* shared interrupt, not mine */
423 outw(status, uhci->io_addr + USBSTS); /* Clear it */
425 if (status & ~(USBSTS_USBINT | USBSTS_ERROR | USBSTS_RD)) {
426 if (status & USBSTS_HSE)
427 dev_err(uhci_dev(uhci), "host system error, "
429 if (status & USBSTS_HCPE)
430 dev_err(uhci_dev(uhci), "host controller process "
431 "error, something bad happened!\n");
432 if (status & USBSTS_HCH) {
433 spin_lock(&uhci->lock);
434 if (uhci->rh_state >= UHCI_RH_RUNNING) {
435 dev_err(uhci_dev(uhci),
436 "host controller halted, "
438 if (debug > 1 && errbuf) {
439 /* Print the schedule for debugging */
440 uhci_sprint_schedule(uhci,
446 /* Force a callback in case there are
448 mod_timer(&hcd->rh_timer, jiffies);
450 spin_unlock(&uhci->lock);
454 if (status & USBSTS_RD)
455 usb_hcd_poll_rh_status(hcd);
457 spin_lock(&uhci->lock);
458 uhci_scan_schedule(uhci);
459 spin_unlock(&uhci->lock);
466 * Store the current frame number in uhci->frame_number if the controller
467 * is runnning. Expand from 11 bits (of which we use only 10) to a
468 * full-sized integer.
470 * Like many other parts of the driver, this code relies on being polled
471 * more than once per second as long as the controller is running.
473 static void uhci_get_current_frame_number(struct uhci_hcd *uhci)
475 if (!uhci->is_stopped) {
478 delta = (inw(uhci->io_addr + USBFRNUM) - uhci->frame_number) &
479 (UHCI_NUMFRAMES - 1);
480 uhci->frame_number += delta;
485 * De-allocate all resources
487 static void release_uhci(struct uhci_hcd *uhci)
491 if (DEBUG_CONFIGURED) {
492 spin_lock_irq(&uhci->lock);
493 uhci->is_initialized = 0;
494 spin_unlock_irq(&uhci->lock);
496 debugfs_remove(uhci->dentry);
499 for (i = 0; i < UHCI_NUM_SKELQH; i++)
500 uhci_free_qh(uhci, uhci->skelqh[i]);
502 uhci_free_td(uhci, uhci->term_td);
504 dma_pool_destroy(uhci->qh_pool);
506 dma_pool_destroy(uhci->td_pool);
508 kfree(uhci->frame_cpu);
510 dma_free_coherent(uhci_dev(uhci),
511 UHCI_NUMFRAMES * sizeof(*uhci->frame),
512 uhci->frame, uhci->frame_dma_handle);
515 static int uhci_init(struct usb_hcd *hcd)
517 struct uhci_hcd *uhci = hcd_to_uhci(hcd);
518 unsigned io_size = (unsigned) hcd->rsrc_len;
521 uhci->io_addr = (unsigned long) hcd->rsrc_start;
523 /* The UHCI spec says devices must have 2 ports, and goes on to say
524 * they may have more but gives no way to determine how many there
525 * are. However according to the UHCI spec, Bit 7 of the port
526 * status and control register is always set to 1. So we try to
527 * use this to our advantage. Another common failure mode when
528 * a nonexistent register is addressed is to return all ones, so
529 * we test for that also.
531 for (port = 0; port < (io_size - USBPORTSC1) / 2; port++) {
532 unsigned int portstatus;
534 portstatus = inw(uhci->io_addr + USBPORTSC1 + (port * 2));
535 if (!(portstatus & 0x0080) || portstatus == 0xffff)
539 dev_info(uhci_dev(uhci), "detected %d ports\n", port);
541 /* Anything greater than 7 is weird so we'll ignore it. */
542 if (port > UHCI_RH_MAXCHILD) {
543 dev_info(uhci_dev(uhci), "port count misdetected? "
544 "forcing to 2 ports\n");
547 uhci->rh_numports = port;
549 /* Kick BIOS off this hardware and reset if the controller
550 * isn't already safely quiescent.
552 check_and_reset_hc(uhci);
556 /* Make sure the controller is quiescent and that we're not using it
557 * any more. This is mainly for the benefit of programs which, like kexec,
558 * expect the hardware to be idle: not doing DMA or generating IRQs.
560 * This routine may be called in a damaged or failing kernel. Hence we
561 * do not acquire the spinlock before shutting down the controller.
563 static void uhci_shutdown(struct pci_dev *pdev)
565 struct usb_hcd *hcd = (struct usb_hcd *) pci_get_drvdata(pdev);
567 uhci_hc_died(hcd_to_uhci(hcd));
571 * Allocate a frame list, and then setup the skeleton
573 * The hardware doesn't really know any difference
574 * in the queues, but the order does matter for the
575 * protocols higher up. The order in which the queues
576 * are encountered by the hardware is:
578 * - All isochronous events are handled before any
579 * of the queues. We don't do that here, because
580 * we'll create the actual TD entries on demand.
581 * - The first queue is the high-period interrupt queue.
582 * - The second queue is the period-1 interrupt and async
583 * (low-speed control, full-speed control, then bulk) queue.
584 * - The third queue is the terminating bandwidth reclamation queue,
585 * which contains no members, loops back to itself, and is present
586 * only when FSBR is on and there are no full-speed control or bulk QHs.
588 static int uhci_start(struct usb_hcd *hcd)
590 struct uhci_hcd *uhci = hcd_to_uhci(hcd);
593 struct dentry *dentry;
595 hcd->uses_new_polling = 1;
597 spin_lock_init(&uhci->lock);
598 setup_timer(&uhci->fsbr_timer, uhci_fsbr_timeout,
599 (unsigned long) uhci);
600 INIT_LIST_HEAD(&uhci->idle_qh_list);
601 init_waitqueue_head(&uhci->waitqh);
603 if (DEBUG_CONFIGURED) {
604 dentry = debugfs_create_file(hcd->self.bus_name,
605 S_IFREG|S_IRUGO|S_IWUSR, uhci_debugfs_root,
606 uhci, &uhci_debug_operations);
608 dev_err(uhci_dev(uhci), "couldn't create uhci "
611 goto err_create_debug_entry;
613 uhci->dentry = dentry;
616 uhci->frame = dma_alloc_coherent(uhci_dev(uhci),
617 UHCI_NUMFRAMES * sizeof(*uhci->frame),
618 &uhci->frame_dma_handle, 0);
620 dev_err(uhci_dev(uhci), "unable to allocate "
621 "consistent memory for frame list\n");
622 goto err_alloc_frame;
624 memset(uhci->frame, 0, UHCI_NUMFRAMES * sizeof(*uhci->frame));
626 uhci->frame_cpu = kcalloc(UHCI_NUMFRAMES, sizeof(*uhci->frame_cpu),
628 if (!uhci->frame_cpu) {
629 dev_err(uhci_dev(uhci), "unable to allocate "
630 "memory for frame pointers\n");
631 goto err_alloc_frame_cpu;
634 uhci->td_pool = dma_pool_create("uhci_td", uhci_dev(uhci),
635 sizeof(struct uhci_td), 16, 0);
636 if (!uhci->td_pool) {
637 dev_err(uhci_dev(uhci), "unable to create td dma_pool\n");
638 goto err_create_td_pool;
641 uhci->qh_pool = dma_pool_create("uhci_qh", uhci_dev(uhci),
642 sizeof(struct uhci_qh), 16, 0);
643 if (!uhci->qh_pool) {
644 dev_err(uhci_dev(uhci), "unable to create qh dma_pool\n");
645 goto err_create_qh_pool;
648 uhci->term_td = uhci_alloc_td(uhci);
649 if (!uhci->term_td) {
650 dev_err(uhci_dev(uhci), "unable to allocate terminating TD\n");
651 goto err_alloc_term_td;
654 for (i = 0; i < UHCI_NUM_SKELQH; i++) {
655 uhci->skelqh[i] = uhci_alloc_qh(uhci, NULL, NULL);
656 if (!uhci->skelqh[i]) {
657 dev_err(uhci_dev(uhci), "unable to allocate QH\n");
658 goto err_alloc_skelqh;
663 * 8 Interrupt queues; link all higher int queues to int1 = async
665 for (i = SKEL_ISO + 1; i < SKEL_ASYNC; ++i)
666 uhci->skelqh[i]->link = LINK_TO_QH(uhci->skel_async_qh);
667 uhci->skel_async_qh->link = UHCI_PTR_TERM;
668 uhci->skel_term_qh->link = LINK_TO_QH(uhci->skel_term_qh);
670 /* This dummy TD is to work around a bug in Intel PIIX controllers */
671 uhci_fill_td(uhci->term_td, 0, uhci_explen(0) |
672 (0x7f << TD_TOKEN_DEVADDR_SHIFT) | USB_PID_IN, 0);
673 uhci->term_td->link = UHCI_PTR_TERM;
674 uhci->skel_async_qh->element = uhci->skel_term_qh->element =
675 LINK_TO_TD(uhci->term_td);
678 * Fill the frame list: make all entries point to the proper
681 for (i = 0; i < UHCI_NUMFRAMES; i++) {
683 /* Only place we don't use the frame list routines */
684 uhci->frame[i] = uhci_frame_skel_link(uhci, i);
688 * Some architectures require a full mb() to enforce completion of
689 * the memory writes above before the I/O transfers in configure_hc().
694 uhci->is_initialized = 1;
702 for (i = 0; i < UHCI_NUM_SKELQH; i++) {
704 uhci_free_qh(uhci, uhci->skelqh[i]);
707 uhci_free_td(uhci, uhci->term_td);
710 dma_pool_destroy(uhci->qh_pool);
713 dma_pool_destroy(uhci->td_pool);
716 kfree(uhci->frame_cpu);
719 dma_free_coherent(uhci_dev(uhci),
720 UHCI_NUMFRAMES * sizeof(*uhci->frame),
721 uhci->frame, uhci->frame_dma_handle);
724 debugfs_remove(uhci->dentry);
726 err_create_debug_entry:
730 static void uhci_stop(struct usb_hcd *hcd)
732 struct uhci_hcd *uhci = hcd_to_uhci(hcd);
734 spin_lock_irq(&uhci->lock);
735 if (test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags) && !uhci->dead)
737 uhci_scan_schedule(uhci);
738 spin_unlock_irq(&uhci->lock);
740 del_timer_sync(&uhci->fsbr_timer);
745 static int uhci_rh_suspend(struct usb_hcd *hcd)
747 struct uhci_hcd *uhci = hcd_to_uhci(hcd);
750 spin_lock_irq(&uhci->lock);
751 if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags))
753 else if (!uhci->dead)
754 suspend_rh(uhci, UHCI_RH_SUSPENDED);
755 spin_unlock_irq(&uhci->lock);
759 static int uhci_rh_resume(struct usb_hcd *hcd)
761 struct uhci_hcd *uhci = hcd_to_uhci(hcd);
764 spin_lock_irq(&uhci->lock);
765 if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags))
767 else if (!uhci->dead)
769 spin_unlock_irq(&uhci->lock);
773 static int uhci_pci_suspend(struct usb_hcd *hcd, pm_message_t message)
775 struct uhci_hcd *uhci = hcd_to_uhci(hcd);
778 dev_dbg(uhci_dev(uhci), "%s\n", __func__);
780 spin_lock_irq(&uhci->lock);
781 if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags) || uhci->dead)
782 goto done_okay; /* Already suspended or dead */
784 if (uhci->rh_state > UHCI_RH_SUSPENDED) {
785 dev_warn(uhci_dev(uhci), "Root hub isn't suspended!\n");
790 /* All PCI host controllers are required to disable IRQ generation
791 * at the source, so we must turn off PIRQ.
793 pci_write_config_word(to_pci_dev(uhci_dev(uhci)), USBLEGSUP, 0);
797 /* FIXME: Enable non-PME# remote wakeup? */
799 /* make sure snapshot being resumed re-enumerates everything */
800 if (message.event == PM_EVENT_PRETHAW)
804 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
806 spin_unlock_irq(&uhci->lock);
810 static int uhci_pci_resume(struct usb_hcd *hcd)
812 struct uhci_hcd *uhci = hcd_to_uhci(hcd);
814 dev_dbg(uhci_dev(uhci), "%s\n", __func__);
816 /* Since we aren't in D3 any more, it's safe to set this flag
817 * even if the controller was dead.
819 set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
822 spin_lock_irq(&uhci->lock);
824 /* FIXME: Disable non-PME# remote wakeup? */
826 /* The firmware or a boot kernel may have changed the controller
827 * settings during a system wakeup. Check it and reconfigure
830 check_and_reset_hc(uhci);
832 /* If the controller was dead before, it's back alive now */
835 if (uhci->rh_state == UHCI_RH_RESET) {
837 /* The controller had to be reset */
838 usb_root_hub_lost_power(hcd->self.root_hub);
839 suspend_rh(uhci, UHCI_RH_SUSPENDED);
842 spin_unlock_irq(&uhci->lock);
844 /* If interrupts don't work and remote wakeup is enabled then
845 * the suspended root hub needs to be polled.
847 if (!uhci->RD_enable && hcd->self.root_hub->do_remote_wakeup) {
849 usb_hcd_poll_rh_status(hcd);
855 /* Wait until a particular device/endpoint's QH is idle, and free it */
856 static void uhci_hcd_endpoint_disable(struct usb_hcd *hcd,
857 struct usb_host_endpoint *hep)
859 struct uhci_hcd *uhci = hcd_to_uhci(hcd);
862 spin_lock_irq(&uhci->lock);
863 qh = (struct uhci_qh *) hep->hcpriv;
867 while (qh->state != QH_STATE_IDLE) {
869 spin_unlock_irq(&uhci->lock);
870 wait_event_interruptible(uhci->waitqh,
871 qh->state == QH_STATE_IDLE);
872 spin_lock_irq(&uhci->lock);
876 uhci_free_qh(uhci, qh);
878 spin_unlock_irq(&uhci->lock);
881 static int uhci_hcd_get_frame_number(struct usb_hcd *hcd)
883 struct uhci_hcd *uhci = hcd_to_uhci(hcd);
884 unsigned frame_number;
887 /* Minimize latency by avoiding the spinlock */
888 frame_number = uhci->frame_number;
890 delta = (inw(uhci->io_addr + USBFRNUM) - frame_number) &
891 (UHCI_NUMFRAMES - 1);
892 return frame_number + delta;
895 static const char hcd_name[] = "uhci_hcd";
897 static const struct hc_driver uhci_driver = {
898 .description = hcd_name,
899 .product_desc = "UHCI Host Controller",
900 .hcd_priv_size = sizeof(struct uhci_hcd),
902 /* Generic hardware linkage */
906 /* Basic lifecycle operations */
910 .pci_suspend = uhci_pci_suspend,
911 .pci_resume = uhci_pci_resume,
912 .bus_suspend = uhci_rh_suspend,
913 .bus_resume = uhci_rh_resume,
917 .urb_enqueue = uhci_urb_enqueue,
918 .urb_dequeue = uhci_urb_dequeue,
920 .endpoint_disable = uhci_hcd_endpoint_disable,
921 .get_frame_number = uhci_hcd_get_frame_number,
923 .hub_status_data = uhci_hub_status_data,
924 .hub_control = uhci_hub_control,
927 static const struct pci_device_id uhci_pci_ids[] = { {
928 /* handle any USB UHCI controller */
929 PCI_DEVICE_CLASS(PCI_CLASS_SERIAL_USB_UHCI, ~0),
930 .driver_data = (unsigned long) &uhci_driver,
931 }, { /* end: all zeroes */ }
934 MODULE_DEVICE_TABLE(pci, uhci_pci_ids);
936 static struct pci_driver uhci_pci_driver = {
937 .name = (char *)hcd_name,
938 .id_table = uhci_pci_ids,
940 .probe = usb_hcd_pci_probe,
941 .remove = usb_hcd_pci_remove,
942 .shutdown = uhci_shutdown,
945 .suspend = usb_hcd_pci_suspend,
946 .resume = usb_hcd_pci_resume,
950 static int __init uhci_hcd_init(void)
952 int retval = -ENOMEM;
954 printk(KERN_INFO DRIVER_DESC " " DRIVER_VERSION "%s\n",
955 ignore_oc ? ", overcurrent ignored" : "");
960 if (DEBUG_CONFIGURED) {
961 errbuf = kmalloc(ERRBUF_LEN, GFP_KERNEL);
964 uhci_debugfs_root = debugfs_create_dir("uhci", NULL);
965 if (!uhci_debugfs_root)
969 uhci_up_cachep = kmem_cache_create("uhci_urb_priv",
970 sizeof(struct urb_priv), 0, 0, NULL);
974 retval = pci_register_driver(&uhci_pci_driver);
981 kmem_cache_destroy(uhci_up_cachep);
984 debugfs_remove(uhci_debugfs_root);
994 static void __exit uhci_hcd_cleanup(void)
996 pci_unregister_driver(&uhci_pci_driver);
997 kmem_cache_destroy(uhci_up_cachep);
998 debugfs_remove(uhci_debugfs_root);
1002 module_init(uhci_hcd_init);
1003 module_exit(uhci_hcd_cleanup);
1005 MODULE_AUTHOR(DRIVER_AUTHOR);
1006 MODULE_DESCRIPTION(DRIVER_DESC);
1007 MODULE_LICENSE("GPL");