1 // SPDX-License-Identifier: GPL-2.0
3 * Universal Host Controller Interface driver for USB.
5 * Maintainer: Alan Stern <stern@rowland.harvard.edu>
7 * (C) Copyright 1999 Linus Torvalds
8 * (C) Copyright 1999-2002 Johannes Erdfelt, johannes@erdfelt.com
9 * (C) Copyright 1999 Randy Dunlap
10 * (C) Copyright 1999 Georg Acher, acher@in.tum.de
11 * (C) Copyright 1999 Deti Fliegl, deti@fliegl.de
12 * (C) Copyright 1999 Thomas Sailer, sailer@ife.ee.ethz.ch
13 * (C) Copyright 1999 Roman Weissgaerber, weissg@vienna.at
14 * (C) Copyright 2000 Yggdrasil Computing, Inc. (port of new PCI interface
15 * support from usb-ohci.c by Adam Richter, adam@yggdrasil.com).
16 * (C) Copyright 1999 Gregory P. Smith (from usb-ohci.c)
17 * (C) Copyright 2004-2007 Alan Stern, stern@rowland.harvard.edu
19 * Intel documents this fairly well, and as far as I know there
20 * are no royalties or anything like that, but even so there are
21 * people who decided that they want to do the same thing in a
22 * completely different way.
26 #include <linux/module.h>
27 #include <linux/pci.h>
28 #include <linux/kernel.h>
29 #include <linux/init.h>
30 #include <linux/delay.h>
31 #include <linux/ioport.h>
32 #include <linux/slab.h>
33 #include <linux/errno.h>
34 #include <linux/unistd.h>
35 #include <linux/interrupt.h>
36 #include <linux/spinlock.h>
37 #include <linux/debugfs.h>
39 #include <linux/dmapool.h>
40 #include <linux/dma-mapping.h>
41 #include <linux/usb.h>
42 #include <linux/usb/hcd.h>
43 #include <linux/bitops.h>
44 #include <linux/dmi.h>
46 #include <linux/uaccess.h>
55 #define DRIVER_AUTHOR \
56 "Linus 'Frodo Rabbit' Torvalds, Johannes Erdfelt, " \
57 "Randy Dunlap, Georg Acher, Deti Fliegl, Thomas Sailer, " \
58 "Roman Weissgaerber, Alan Stern"
59 #define DRIVER_DESC "USB Universal Host Controller Interface driver"
61 /* for flakey hardware, ignore overcurrent indicators */
62 static bool ignore_oc
;
63 module_param(ignore_oc
, bool, S_IRUGO
);
64 MODULE_PARM_DESC(ignore_oc
, "ignore hardware overcurrent indications");
67 * debug = 0, no debugging messages
68 * debug = 1, dump failed URBs except for stalls
69 * debug = 2, dump all failed URBs (including stalls)
70 * show all queues in /sys/kernel/debug/uhci/[pci_addr]
71 * debug = 3, show all TDs in URBs when dumping
73 #ifdef CONFIG_DYNAMIC_DEBUG
76 module_param(debug
, int, S_IRUGO
| S_IWUSR
);
77 MODULE_PARM_DESC(debug
, "Debug level");
88 #define ERRBUF_LEN (32 * 1024)
90 static struct kmem_cache
*uhci_up_cachep
; /* urb_priv */
92 static void suspend_rh(struct uhci_hcd
*uhci
, enum uhci_rh_state new_state
);
93 static void wakeup_rh(struct uhci_hcd
*uhci
);
94 static void uhci_get_current_frame_number(struct uhci_hcd
*uhci
);
97 * Calculate the link pointer DMA value for the first Skeleton QH in a frame.
99 static __hc32
uhci_frame_skel_link(struct uhci_hcd
*uhci
, int frame
)
104 * The interrupt queues will be interleaved as evenly as possible.
105 * There's not much to be done about period-1 interrupts; they have
106 * to occur in every frame. But we can schedule period-2 interrupts
107 * in odd-numbered frames, period-4 interrupts in frames congruent
108 * to 2 (mod 4), and so on. This way each frame only has two
109 * interrupt QHs, which will help spread out bandwidth utilization.
111 * ffs (Find First bit Set) does exactly what we need:
112 * 1,3,5,... => ffs = 0 => use period-2 QH = skelqh[8],
113 * 2,6,10,... => ffs = 1 => use period-4 QH = skelqh[7], etc.
114 * ffs >= 7 => not on any high-period queue, so use
115 * period-1 QH = skelqh[9].
116 * Add in UHCI_NUMFRAMES to insure at least one bit is set.
118 skelnum
= 8 - (int) __ffs(frame
| UHCI_NUMFRAMES
);
121 return LINK_TO_QH(uhci
, uhci
->skelqh
[skelnum
]);
124 #include "uhci-debug.c"
126 #include "uhci-hub.c"
129 * Finish up a host controller reset and update the recorded state.
131 static void finish_reset(struct uhci_hcd
*uhci
)
135 /* HCRESET doesn't affect the Suspend, Reset, and Resume Detect
136 * bits in the port status and control registers.
137 * We have to clear them by hand.
139 for (port
= 0; port
< uhci
->rh_numports
; ++port
)
140 uhci_writew(uhci
, 0, USBPORTSC1
+ (port
* 2));
142 uhci
->port_c_suspend
= uhci
->resuming_ports
= 0;
143 uhci
->rh_state
= UHCI_RH_RESET
;
144 uhci
->is_stopped
= UHCI_IS_STOPPED
;
145 clear_bit(HCD_FLAG_POLL_RH
, &uhci_to_hcd(uhci
)->flags
);
149 * Last rites for a defunct/nonfunctional controller
150 * or one we don't want to use any more.
152 static void uhci_hc_died(struct uhci_hcd
*uhci
)
154 uhci_get_current_frame_number(uhci
);
155 uhci
->reset_hc(uhci
);
159 /* The current frame may already be partway finished */
160 ++uhci
->frame_number
;
164 * Initialize a controller that was newly discovered or has lost power
165 * or otherwise been reset while it was suspended. In none of these cases
166 * can we be sure of its previous state.
168 static void check_and_reset_hc(struct uhci_hcd
*uhci
)
170 if (uhci
->check_and_reset_hc(uhci
))
174 #if defined(CONFIG_USB_UHCI_SUPPORT_NON_PCI_HC)
176 * The two functions below are generic reset functions that are used on systems
177 * that do not have keyboard and mouse legacy support. We assume that we are
178 * running on such a system if CONFIG_USB_UHCI_SUPPORT_NON_PCI_HC is defined.
182 * Make sure the controller is completely inactive, unable to
183 * generate interrupts or do DMA.
185 static void uhci_generic_reset_hc(struct uhci_hcd
*uhci
)
187 /* Reset the HC - this will force us to get a
188 * new notification of any already connected
189 * ports due to the virtual disconnect that it
192 uhci_writew(uhci
, USBCMD_HCRESET
, USBCMD
);
195 if (uhci_readw(uhci
, USBCMD
) & USBCMD_HCRESET
)
196 dev_warn(uhci_dev(uhci
), "HCRESET not completed yet!\n");
198 /* Just to be safe, disable interrupt requests and
199 * make sure the controller is stopped.
201 uhci_writew(uhci
, 0, USBINTR
);
202 uhci_writew(uhci
, 0, USBCMD
);
206 * Initialize a controller that was newly discovered or has just been
207 * resumed. In either case we can't be sure of its previous state.
209 * Returns: 1 if the controller was reset, 0 otherwise.
211 static int uhci_generic_check_and_reset_hc(struct uhci_hcd
*uhci
)
213 unsigned int cmd
, intr
;
216 * When restarting a suspended controller, we expect all the
217 * settings to be the same as we left them:
219 * Controller is stopped and configured with EGSM set;
220 * No interrupts enabled except possibly Resume Detect.
222 * If any of these conditions are violated we do a complete reset.
225 cmd
= uhci_readw(uhci
, USBCMD
);
226 if ((cmd
& USBCMD_RS
) || !(cmd
& USBCMD_CF
) || !(cmd
& USBCMD_EGSM
)) {
227 dev_dbg(uhci_dev(uhci
), "%s: cmd = 0x%04x\n",
232 intr
= uhci_readw(uhci
, USBINTR
);
233 if (intr
& (~USBINTR_RESUME
)) {
234 dev_dbg(uhci_dev(uhci
), "%s: intr = 0x%04x\n",
241 dev_dbg(uhci_dev(uhci
), "Performing full reset\n");
242 uhci_generic_reset_hc(uhci
);
245 #endif /* CONFIG_USB_UHCI_SUPPORT_NON_PCI_HC */
248 * Store the basic register settings needed by the controller.
250 static void configure_hc(struct uhci_hcd
*uhci
)
252 /* Set the frame length to the default: 1 ms exactly */
253 uhci_writeb(uhci
, USBSOF_DEFAULT
, USBSOF
);
255 /* Store the frame list base address */
256 uhci_writel(uhci
, uhci
->frame_dma_handle
, USBFLBASEADD
);
258 /* Set the current frame number */
259 uhci_writew(uhci
, uhci
->frame_number
& UHCI_MAX_SOF_NUMBER
,
262 /* perform any arch/bus specific configuration */
263 if (uhci
->configure_hc
)
264 uhci
->configure_hc(uhci
);
267 static int resume_detect_interrupts_are_broken(struct uhci_hcd
*uhci
)
270 * If we have to ignore overcurrent events then almost by definition
271 * we can't depend on resume-detect interrupts.
273 * Those interrupts also don't seem to work on ASpeed SoCs.
275 if (ignore_oc
|| uhci_is_aspeed(uhci
))
278 return uhci
->resume_detect_interrupts_are_broken
?
279 uhci
->resume_detect_interrupts_are_broken(uhci
) : 0;
282 static int global_suspend_mode_is_broken(struct uhci_hcd
*uhci
)
284 return uhci
->global_suspend_mode_is_broken
?
285 uhci
->global_suspend_mode_is_broken(uhci
) : 0;
288 static void suspend_rh(struct uhci_hcd
*uhci
, enum uhci_rh_state new_state
)
289 __releases(uhci
->lock
)
290 __acquires(uhci
->lock
)
293 int int_enable
, egsm_enable
, wakeup_enable
;
294 struct usb_device
*rhdev
= uhci_to_hcd(uhci
)->self
.root_hub
;
296 auto_stop
= (new_state
== UHCI_RH_AUTO_STOPPED
);
297 dev_dbg(&rhdev
->dev
, "%s%s\n", __func__
,
298 (auto_stop
? " (auto-stop)" : ""));
300 /* Start off by assuming Resume-Detect interrupts and EGSM work
301 * and that remote wakeups should be enabled.
303 egsm_enable
= USBCMD_EGSM
;
304 int_enable
= USBINTR_RESUME
;
308 * In auto-stop mode, we must be able to detect new connections.
309 * The user can force us to poll by disabling remote wakeup;
310 * otherwise we will use the EGSM/RD mechanism.
313 if (!device_may_wakeup(&rhdev
->dev
))
314 egsm_enable
= int_enable
= 0;
319 * In bus-suspend mode, we use the wakeup setting specified
323 if (!rhdev
->do_remote_wakeup
)
329 * UHCI doesn't distinguish between wakeup requests from downstream
330 * devices and local connect/disconnect events. There's no way to
331 * enable one without the other; both are controlled by EGSM. Thus
332 * if wakeups are disallowed then EGSM must be turned off -- in which
333 * case remote wakeup requests from downstream during system sleep
336 * In addition, if EGSM is broken then we can't use it. Likewise,
337 * if Resume-Detect interrupts are broken then we can't use them.
339 * Finally, neither EGSM nor RD is useful by itself. Without EGSM,
340 * the RD status bit will never get set. Without RD, the controller
341 * won't generate interrupts to tell the system about wakeup events.
343 if (!wakeup_enable
|| global_suspend_mode_is_broken(uhci
) ||
344 resume_detect_interrupts_are_broken(uhci
))
345 egsm_enable
= int_enable
= 0;
347 uhci
->RD_enable
= !!int_enable
;
348 uhci_writew(uhci
, int_enable
, USBINTR
);
349 uhci_writew(uhci
, egsm_enable
| USBCMD_CF
, USBCMD
);
353 /* If we're auto-stopping then no devices have been attached
354 * for a while, so there shouldn't be any active URBs and the
355 * controller should stop after a few microseconds. Otherwise
356 * we will give the controller one frame to stop.
358 if (!auto_stop
&& !(uhci_readw(uhci
, USBSTS
) & USBSTS_HCH
)) {
359 uhci
->rh_state
= UHCI_RH_SUSPENDING
;
360 spin_unlock_irq(&uhci
->lock
);
362 spin_lock_irq(&uhci
->lock
);
366 if (!(uhci_readw(uhci
, USBSTS
) & USBSTS_HCH
))
367 dev_warn(uhci_dev(uhci
), "Controller not stopped yet!\n");
369 uhci_get_current_frame_number(uhci
);
371 uhci
->rh_state
= new_state
;
372 uhci
->is_stopped
= UHCI_IS_STOPPED
;
375 * If remote wakeup is enabled but either EGSM or RD interrupts
376 * doesn't work, then we won't get an interrupt when a wakeup event
377 * occurs. Thus the suspended root hub needs to be polled.
379 if (wakeup_enable
&& (!int_enable
|| !egsm_enable
))
380 set_bit(HCD_FLAG_POLL_RH
, &uhci_to_hcd(uhci
)->flags
);
382 clear_bit(HCD_FLAG_POLL_RH
, &uhci_to_hcd(uhci
)->flags
);
384 uhci_scan_schedule(uhci
);
388 static void start_rh(struct uhci_hcd
*uhci
)
390 uhci
->is_stopped
= 0;
393 * Clear stale status bits on Aspeed as we get a stale HCH
394 * which causes problems later on
396 if (uhci_is_aspeed(uhci
))
397 uhci_writew(uhci
, uhci_readw(uhci
, USBSTS
), USBSTS
);
399 /* Mark it configured and running with a 64-byte max packet.
400 * All interrupts are enabled, even though RESUME won't do anything.
402 uhci_writew(uhci
, USBCMD_RS
| USBCMD_CF
| USBCMD_MAXP
, USBCMD
);
403 uhci_writew(uhci
, USBINTR_TIMEOUT
| USBINTR_RESUME
|
404 USBINTR_IOC
| USBINTR_SP
, USBINTR
);
406 uhci
->rh_state
= UHCI_RH_RUNNING
;
407 set_bit(HCD_FLAG_POLL_RH
, &uhci_to_hcd(uhci
)->flags
);
410 static void wakeup_rh(struct uhci_hcd
*uhci
)
411 __releases(uhci
->lock
)
412 __acquires(uhci
->lock
)
414 dev_dbg(&uhci_to_hcd(uhci
)->self
.root_hub
->dev
,
416 uhci
->rh_state
== UHCI_RH_AUTO_STOPPED
?
417 " (auto-start)" : "");
419 /* If we are auto-stopped then no devices are attached so there's
420 * no need for wakeup signals. Otherwise we send Global Resume
423 if (uhci
->rh_state
== UHCI_RH_SUSPENDED
) {
426 /* Keep EGSM on if it was set before */
427 egsm
= uhci_readw(uhci
, USBCMD
) & USBCMD_EGSM
;
428 uhci
->rh_state
= UHCI_RH_RESUMING
;
429 uhci_writew(uhci
, USBCMD_FGR
| USBCMD_CF
| egsm
, USBCMD
);
430 spin_unlock_irq(&uhci
->lock
);
432 spin_lock_irq(&uhci
->lock
);
436 /* End Global Resume and wait for EOP to be sent */
437 uhci_writew(uhci
, USBCMD_CF
, USBCMD
);
440 if (uhci_readw(uhci
, USBCMD
) & USBCMD_FGR
)
441 dev_warn(uhci_dev(uhci
), "FGR not stopped yet!\n");
446 /* Restart root hub polling */
447 mod_timer(&uhci_to_hcd(uhci
)->rh_timer
, jiffies
);
450 static irqreturn_t
uhci_irq(struct usb_hcd
*hcd
)
452 struct uhci_hcd
*uhci
= hcd_to_uhci(hcd
);
453 unsigned short status
;
456 * Read the interrupt status, and write it back to clear the
457 * interrupt cause. Contrary to the UHCI specification, the
458 * "HC Halted" status bit is persistent: it is RO, not R/WC.
460 status
= uhci_readw(uhci
, USBSTS
);
461 if (!(status
& ~USBSTS_HCH
)) /* shared interrupt, not mine */
463 uhci_writew(uhci
, status
, USBSTS
); /* Clear it */
465 spin_lock(&uhci
->lock
);
466 if (unlikely(!uhci
->is_initialized
)) /* not yet configured */
469 if (status
& ~(USBSTS_USBINT
| USBSTS_ERROR
| USBSTS_RD
)) {
470 if (status
& USBSTS_HSE
)
471 dev_err(uhci_dev(uhci
),
472 "host system error, PCI problems?\n");
473 if (status
& USBSTS_HCPE
)
474 dev_err(uhci_dev(uhci
),
475 "host controller process error, something bad happened!\n");
476 if (status
& USBSTS_HCH
) {
477 if (uhci
->rh_state
>= UHCI_RH_RUNNING
) {
478 dev_err(uhci_dev(uhci
),
479 "host controller halted, very bad!\n");
480 if (debug
> 1 && errbuf
) {
481 /* Print the schedule for debugging */
482 uhci_sprint_schedule(uhci
, errbuf
,
483 ERRBUF_LEN
- EXTRA_SPACE
);
489 /* Force a callback in case there are
491 mod_timer(&hcd
->rh_timer
, jiffies
);
496 if (status
& USBSTS_RD
) {
497 spin_unlock(&uhci
->lock
);
498 usb_hcd_poll_rh_status(hcd
);
500 uhci_scan_schedule(uhci
);
502 spin_unlock(&uhci
->lock
);
509 * Store the current frame number in uhci->frame_number if the controller
510 * is running. Expand from 11 bits (of which we use only 10) to a
511 * full-sized integer.
513 * Like many other parts of the driver, this code relies on being polled
514 * more than once per second as long as the controller is running.
516 static void uhci_get_current_frame_number(struct uhci_hcd
*uhci
)
518 if (!uhci
->is_stopped
) {
521 delta
= (uhci_readw(uhci
, USBFRNUM
) - uhci
->frame_number
) &
522 (UHCI_NUMFRAMES
- 1);
523 uhci
->frame_number
+= delta
;
528 * De-allocate all resources
530 static void release_uhci(struct uhci_hcd
*uhci
)
535 spin_lock_irq(&uhci
->lock
);
536 uhci
->is_initialized
= 0;
537 spin_unlock_irq(&uhci
->lock
);
539 debugfs_remove(uhci
->dentry
);
541 for (i
= 0; i
< UHCI_NUM_SKELQH
; i
++)
542 uhci_free_qh(uhci
, uhci
->skelqh
[i
]);
544 uhci_free_td(uhci
, uhci
->term_td
);
546 dma_pool_destroy(uhci
->qh_pool
);
548 dma_pool_destroy(uhci
->td_pool
);
550 kfree(uhci
->frame_cpu
);
552 dma_free_coherent(uhci_dev(uhci
),
553 UHCI_NUMFRAMES
* sizeof(*uhci
->frame
),
554 uhci
->frame
, uhci
->frame_dma_handle
);
558 * Allocate a frame list, and then setup the skeleton
560 * The hardware doesn't really know any difference
561 * in the queues, but the order does matter for the
562 * protocols higher up. The order in which the queues
563 * are encountered by the hardware is:
565 * - All isochronous events are handled before any
566 * of the queues. We don't do that here, because
567 * we'll create the actual TD entries on demand.
568 * - The first queue is the high-period interrupt queue.
569 * - The second queue is the period-1 interrupt and async
570 * (low-speed control, full-speed control, then bulk) queue.
571 * - The third queue is the terminating bandwidth reclamation queue,
572 * which contains no members, loops back to itself, and is present
573 * only when FSBR is on and there are no full-speed control or bulk QHs.
575 static int uhci_start(struct usb_hcd
*hcd
)
577 struct uhci_hcd
*uhci
= hcd_to_uhci(hcd
);
580 struct dentry __maybe_unused
*dentry
;
582 hcd
->uses_new_polling
= 1;
583 /* Accept arbitrarily long scatter-gather lists */
584 if (!(hcd
->driver
->flags
& HCD_LOCAL_MEM
))
585 hcd
->self
.sg_tablesize
= ~0;
587 spin_lock_init(&uhci
->lock
);
588 timer_setup(&uhci
->fsbr_timer
, uhci_fsbr_timeout
, 0);
589 INIT_LIST_HEAD(&uhci
->idle_qh_list
);
590 init_waitqueue_head(&uhci
->waitqh
);
592 #ifdef UHCI_DEBUG_OPS
593 dentry
= debugfs_create_file(hcd
->self
.bus_name
,
594 S_IFREG
|S_IRUGO
|S_IWUSR
, uhci_debugfs_root
,
595 uhci
, &uhci_debug_operations
);
597 dev_err(uhci_dev(uhci
), "couldn't create uhci debugfs entry\n");
600 uhci
->dentry
= dentry
;
603 uhci
->frame
= dma_zalloc_coherent(uhci_dev(uhci
),
604 UHCI_NUMFRAMES
* sizeof(*uhci
->frame
),
605 &uhci
->frame_dma_handle
, GFP_KERNEL
);
607 dev_err(uhci_dev(uhci
),
608 "unable to allocate consistent memory for frame list\n");
609 goto err_alloc_frame
;
612 uhci
->frame_cpu
= kcalloc(UHCI_NUMFRAMES
, sizeof(*uhci
->frame_cpu
),
614 if (!uhci
->frame_cpu
)
615 goto err_alloc_frame_cpu
;
617 uhci
->td_pool
= dma_pool_create("uhci_td", uhci_dev(uhci
),
618 sizeof(struct uhci_td
), 16, 0);
619 if (!uhci
->td_pool
) {
620 dev_err(uhci_dev(uhci
), "unable to create td dma_pool\n");
621 goto err_create_td_pool
;
624 uhci
->qh_pool
= dma_pool_create("uhci_qh", uhci_dev(uhci
),
625 sizeof(struct uhci_qh
), 16, 0);
626 if (!uhci
->qh_pool
) {
627 dev_err(uhci_dev(uhci
), "unable to create qh dma_pool\n");
628 goto err_create_qh_pool
;
631 uhci
->term_td
= uhci_alloc_td(uhci
);
632 if (!uhci
->term_td
) {
633 dev_err(uhci_dev(uhci
), "unable to allocate terminating TD\n");
634 goto err_alloc_term_td
;
637 for (i
= 0; i
< UHCI_NUM_SKELQH
; i
++) {
638 uhci
->skelqh
[i
] = uhci_alloc_qh(uhci
, NULL
, NULL
);
639 if (!uhci
->skelqh
[i
]) {
640 dev_err(uhci_dev(uhci
), "unable to allocate QH\n");
641 goto err_alloc_skelqh
;
646 * 8 Interrupt queues; link all higher int queues to int1 = async
648 for (i
= SKEL_ISO
+ 1; i
< SKEL_ASYNC
; ++i
)
649 uhci
->skelqh
[i
]->link
= LINK_TO_QH(uhci
, uhci
->skel_async_qh
);
650 uhci
->skel_async_qh
->link
= UHCI_PTR_TERM(uhci
);
651 uhci
->skel_term_qh
->link
= LINK_TO_QH(uhci
, uhci
->skel_term_qh
);
653 /* This dummy TD is to work around a bug in Intel PIIX controllers */
654 uhci_fill_td(uhci
, uhci
->term_td
, 0, uhci_explen(0) |
655 (0x7f << TD_TOKEN_DEVADDR_SHIFT
) | USB_PID_IN
, 0);
656 uhci
->term_td
->link
= UHCI_PTR_TERM(uhci
);
657 uhci
->skel_async_qh
->element
= uhci
->skel_term_qh
->element
=
658 LINK_TO_TD(uhci
, uhci
->term_td
);
661 * Fill the frame list: make all entries point to the proper
664 for (i
= 0; i
< UHCI_NUMFRAMES
; i
++) {
666 /* Only place we don't use the frame list routines */
667 uhci
->frame
[i
] = uhci_frame_skel_link(uhci
, i
);
671 * Some architectures require a full mb() to enforce completion of
672 * the memory writes above before the I/O transfers in configure_hc().
676 spin_lock_irq(&uhci
->lock
);
678 uhci
->is_initialized
= 1;
680 spin_unlock_irq(&uhci
->lock
);
687 for (i
= 0; i
< UHCI_NUM_SKELQH
; i
++) {
689 uhci_free_qh(uhci
, uhci
->skelqh
[i
]);
692 uhci_free_td(uhci
, uhci
->term_td
);
695 dma_pool_destroy(uhci
->qh_pool
);
698 dma_pool_destroy(uhci
->td_pool
);
701 kfree(uhci
->frame_cpu
);
704 dma_free_coherent(uhci_dev(uhci
),
705 UHCI_NUMFRAMES
* sizeof(*uhci
->frame
),
706 uhci
->frame
, uhci
->frame_dma_handle
);
709 debugfs_remove(uhci
->dentry
);
714 static void uhci_stop(struct usb_hcd
*hcd
)
716 struct uhci_hcd
*uhci
= hcd_to_uhci(hcd
);
718 spin_lock_irq(&uhci
->lock
);
719 if (HCD_HW_ACCESSIBLE(hcd
) && !uhci
->dead
)
721 uhci_scan_schedule(uhci
);
722 spin_unlock_irq(&uhci
->lock
);
723 synchronize_irq(hcd
->irq
);
725 del_timer_sync(&uhci
->fsbr_timer
);
730 static int uhci_rh_suspend(struct usb_hcd
*hcd
)
732 struct uhci_hcd
*uhci
= hcd_to_uhci(hcd
);
735 spin_lock_irq(&uhci
->lock
);
736 if (!HCD_HW_ACCESSIBLE(hcd
))
739 ; /* Dead controllers tell no tales */
741 /* Once the controller is stopped, port resumes that are already
742 * in progress won't complete. Hence if remote wakeup is enabled
743 * for the root hub and any ports are in the middle of a resume or
744 * remote wakeup, we must fail the suspend.
746 else if (hcd
->self
.root_hub
->do_remote_wakeup
&&
747 uhci
->resuming_ports
) {
748 dev_dbg(uhci_dev(uhci
),
749 "suspend failed because a port is resuming\n");
752 suspend_rh(uhci
, UHCI_RH_SUSPENDED
);
753 spin_unlock_irq(&uhci
->lock
);
757 static int uhci_rh_resume(struct usb_hcd
*hcd
)
759 struct uhci_hcd
*uhci
= hcd_to_uhci(hcd
);
762 spin_lock_irq(&uhci
->lock
);
763 if (!HCD_HW_ACCESSIBLE(hcd
))
765 else if (!uhci
->dead
)
767 spin_unlock_irq(&uhci
->lock
);
773 /* Wait until a particular device/endpoint's QH is idle, and free it */
774 static void uhci_hcd_endpoint_disable(struct usb_hcd
*hcd
,
775 struct usb_host_endpoint
*hep
)
777 struct uhci_hcd
*uhci
= hcd_to_uhci(hcd
);
780 spin_lock_irq(&uhci
->lock
);
781 qh
= (struct uhci_qh
*) hep
->hcpriv
;
785 while (qh
->state
!= QH_STATE_IDLE
) {
787 spin_unlock_irq(&uhci
->lock
);
788 wait_event_interruptible(uhci
->waitqh
,
789 qh
->state
== QH_STATE_IDLE
);
790 spin_lock_irq(&uhci
->lock
);
794 uhci_free_qh(uhci
, qh
);
796 spin_unlock_irq(&uhci
->lock
);
799 static int uhci_hcd_get_frame_number(struct usb_hcd
*hcd
)
801 struct uhci_hcd
*uhci
= hcd_to_uhci(hcd
);
802 unsigned frame_number
;
805 /* Minimize latency by avoiding the spinlock */
806 frame_number
= uhci
->frame_number
;
808 delta
= (uhci_readw(uhci
, USBFRNUM
) - frame_number
) &
809 (UHCI_NUMFRAMES
- 1);
810 return frame_number
+ delta
;
813 /* Determines number of ports on controller */
814 static int uhci_count_ports(struct usb_hcd
*hcd
)
816 struct uhci_hcd
*uhci
= hcd_to_uhci(hcd
);
817 unsigned io_size
= (unsigned) hcd
->rsrc_len
;
820 /* The UHCI spec says devices must have 2 ports, and goes on to say
821 * they may have more but gives no way to determine how many there
822 * are. However according to the UHCI spec, Bit 7 of the port
823 * status and control register is always set to 1. So we try to
824 * use this to our advantage. Another common failure mode when
825 * a nonexistent register is addressed is to return all ones, so
826 * we test for that also.
828 for (port
= 0; port
< (io_size
- USBPORTSC1
) / 2; port
++) {
829 unsigned int portstatus
;
831 portstatus
= uhci_readw(uhci
, USBPORTSC1
+ (port
* 2));
832 if (!(portstatus
& 0x0080) || portstatus
== 0xffff)
836 dev_info(uhci_dev(uhci
), "detected %d ports\n", port
);
838 /* Anything greater than 7 is weird so we'll ignore it. */
839 if (port
> UHCI_RH_MAXCHILD
) {
840 dev_info(uhci_dev(uhci
),
841 "port count misdetected? forcing to 2 ports\n");
848 static const char hcd_name
[] = "uhci_hcd";
850 #ifdef CONFIG_USB_PCI
851 #include "uhci-pci.c"
852 #define PCI_DRIVER uhci_pci_driver
855 #ifdef CONFIG_SPARC_LEON
856 #include "uhci-grlib.c"
857 #define PLATFORM_DRIVER uhci_grlib_driver
860 #ifdef CONFIG_USB_UHCI_PLATFORM
861 #include "uhci-platform.c"
862 #define PLATFORM_DRIVER uhci_platform_driver
865 #if !defined(PCI_DRIVER) && !defined(PLATFORM_DRIVER)
866 #error "missing bus glue for uhci-hcd"
869 static int __init
uhci_hcd_init(void)
871 int retval
= -ENOMEM
;
876 printk(KERN_INFO
"uhci_hcd: " DRIVER_DESC
"%s\n",
877 ignore_oc
? ", overcurrent ignored" : "");
878 set_bit(USB_UHCI_LOADED
, &usb_hcds_loaded
);
880 #ifdef CONFIG_DYNAMIC_DEBUG
881 errbuf
= kmalloc(ERRBUF_LEN
, GFP_KERNEL
);
884 uhci_debugfs_root
= debugfs_create_dir("uhci", usb_debug_root
);
885 if (!uhci_debugfs_root
)
889 uhci_up_cachep
= kmem_cache_create("uhci_urb_priv",
890 sizeof(struct urb_priv
), 0, 0, NULL
);
894 #ifdef PLATFORM_DRIVER
895 retval
= platform_driver_register(&PLATFORM_DRIVER
);
901 retval
= pci_register_driver(&PCI_DRIVER
);
911 #ifdef PLATFORM_DRIVER
912 platform_driver_unregister(&PLATFORM_DRIVER
);
915 kmem_cache_destroy(uhci_up_cachep
);
918 #if defined(DEBUG) || defined(CONFIG_DYNAMIC_DEBUG)
919 debugfs_remove(uhci_debugfs_root
);
927 clear_bit(USB_UHCI_LOADED
, &usb_hcds_loaded
);
931 static void __exit
uhci_hcd_cleanup(void)
933 #ifdef PLATFORM_DRIVER
934 platform_driver_unregister(&PLATFORM_DRIVER
);
937 pci_unregister_driver(&PCI_DRIVER
);
939 kmem_cache_destroy(uhci_up_cachep
);
940 debugfs_remove(uhci_debugfs_root
);
941 #ifdef CONFIG_DYNAMIC_DEBUG
944 clear_bit(USB_UHCI_LOADED
, &usb_hcds_loaded
);
947 module_init(uhci_hcd_init
);
948 module_exit(uhci_hcd_cleanup
);
950 MODULE_AUTHOR(DRIVER_AUTHOR
);
951 MODULE_DESCRIPTION(DRIVER_DESC
);
952 MODULE_LICENSE("GPL");