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1 /* $FreeBSD$ */
2 /*-
3  * Copyright (c) 2008 Hans Petter Selasky. All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  *
14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24  * SUCH DAMAGE.
25  */
26
27 #include <sys/stdint.h>
28 #include <sys/stddef.h>
29 #include <sys/param.h>
30 #include <sys/queue.h>
31 #include <sys/types.h>
32 #include <sys/systm.h>
33 #include <sys/kernel.h>
34 #include <sys/bus.h>
35 #include <sys/linker_set.h>
36 #include <sys/module.h>
37 #include <sys/lock.h>
38 #include <sys/mutex.h>
39 #include <sys/condvar.h>
40 #include <sys/sysctl.h>
41 #include <sys/sx.h>
42 #include <sys/unistd.h>
43 #include <sys/callout.h>
44 #include <sys/malloc.h>
45 #include <sys/priv.h>
46
47 #include <dev/usb/usb.h>
48 #include <dev/usb/usbdi.h>
49
50 #define USB_DEBUG_VAR usb_ctrl_debug
51
52 #include <dev/usb/usb_core.h>
53 #include <dev/usb/usb_debug.h>
54 #include <dev/usb/usb_process.h>
55 #include <dev/usb/usb_busdma.h>
56 #include <dev/usb/usb_dynamic.h>
57 #include <dev/usb/usb_device.h>
58 #include <dev/usb/usb_hub.h>
59
60 #include <dev/usb/usb_controller.h>
61 #include <dev/usb/usb_bus.h>
62
63 /* function prototypes  */
64
65 static device_probe_t usb_probe;
66 static device_attach_t usb_attach;
67 static device_detach_t usb_detach;
68
69 static void     usb_attach_sub(device_t, struct usb_bus *);
70 static void     usb_post_init(void *);
71
72 /* static variables */
73
74 #ifdef USB_DEBUG
75 static int usb_ctrl_debug = 0;
76
77 SYSCTL_NODE(_hw_usb, OID_AUTO, ctrl, CTLFLAG_RW, 0, "USB controller");
78 SYSCTL_INT(_hw_usb_ctrl, OID_AUTO, debug, CTLFLAG_RW, &usb_ctrl_debug, 0,
79     "Debug level");
80 #endif
81
82 static int usb_no_boot_wait = 0;
83 TUNABLE_INT("hw.usb.no_boot_wait", &usb_no_boot_wait);
84 SYSCTL_INT(_hw_usb, OID_AUTO, no_boot_wait, CTLFLAG_RDTUN, &usb_no_boot_wait, 0,
85     "No device enumerate waiting at boot.");
86
87 static uint8_t usb_post_init_called = 0;
88
89 static devclass_t usb_devclass;
90
91 static device_method_t usb_methods[] = {
92         DEVMETHOD(device_probe, usb_probe),
93         DEVMETHOD(device_attach, usb_attach),
94         DEVMETHOD(device_detach, usb_detach),
95         DEVMETHOD(device_suspend, bus_generic_suspend),
96         DEVMETHOD(device_resume, bus_generic_resume),
97         DEVMETHOD(device_shutdown, bus_generic_shutdown),
98         {0, 0}
99 };
100
101 static driver_t usb_driver = {
102         .name = "usbus",
103         .methods = usb_methods,
104         .size = 0,
105 };
106
107 DRIVER_MODULE(usbus, ohci, usb_driver, usb_devclass, 0, 0);
108 DRIVER_MODULE(usbus, uhci, usb_driver, usb_devclass, 0, 0);
109 DRIVER_MODULE(usbus, ehci, usb_driver, usb_devclass, 0, 0);
110 DRIVER_MODULE(usbus, at91_udp, usb_driver, usb_devclass, 0, 0);
111 DRIVER_MODULE(usbus, uss820, usb_driver, usb_devclass, 0, 0);
112
113 /*------------------------------------------------------------------------*
114  *      usb_probe
115  *
116  * This function is called from "{ehci,ohci,uhci}_pci_attach()".
117  *------------------------------------------------------------------------*/
118 static int
119 usb_probe(device_t dev)
120 {
121         DPRINTF("\n");
122         return (0);
123 }
124
125 /*------------------------------------------------------------------------*
126  *      usb_attach
127  *------------------------------------------------------------------------*/
128 static int
129 usb_attach(device_t dev)
130 {
131         struct usb_bus *bus = device_get_ivars(dev);
132
133         DPRINTF("\n");
134
135         if (bus == NULL) {
136                 DPRINTFN(0, "USB device has no ivars\n");
137                 return (ENXIO);
138         }
139
140         if (usb_no_boot_wait == 0) {
141                 /* delay vfs_mountroot until the bus is explored */
142                 bus->bus_roothold = root_mount_hold(device_get_nameunit(dev));
143         }
144
145         if (usb_post_init_called) {
146                 mtx_lock(&Giant);
147                 usb_attach_sub(dev, bus);
148                 mtx_unlock(&Giant);
149                 usb_needs_explore(bus, 1);
150         }
151         return (0);                     /* return success */
152 }
153
154 /*------------------------------------------------------------------------*
155  *      usb_detach
156  *------------------------------------------------------------------------*/
157 static int
158 usb_detach(device_t dev)
159 {
160         struct usb_bus *bus = device_get_softc(dev);
161
162         DPRINTF("\n");
163
164         if (bus == NULL) {
165                 /* was never setup properly */
166                 return (0);
167         }
168         /* Stop power watchdog */
169         usb_callout_drain(&bus->power_wdog);
170
171         /* Let the USB explore process detach all devices. */
172         if (bus->bus_roothold != NULL) {
173                 root_mount_rel(bus->bus_roothold);
174                 bus->bus_roothold = NULL;
175         }
176
177         USB_BUS_LOCK(bus);
178         if (usb_proc_msignal(&bus->explore_proc,
179             &bus->detach_msg[0], &bus->detach_msg[1])) {
180                 /* ignore */
181         }
182         /* Wait for detach to complete */
183
184         usb_proc_mwait(&bus->explore_proc,
185             &bus->detach_msg[0], &bus->detach_msg[1]);
186
187         USB_BUS_UNLOCK(bus);
188
189         /* Get rid of USB callback processes */
190
191         usb_proc_free(&bus->giant_callback_proc);
192         usb_proc_free(&bus->non_giant_callback_proc);
193
194         /* Get rid of USB explore process */
195
196         usb_proc_free(&bus->explore_proc);
197
198         /* Get rid of control transfer process */
199
200         usb_proc_free(&bus->control_xfer_proc);
201
202         return (0);
203 }
204
205 /*------------------------------------------------------------------------*
206  *      usb_bus_explore
207  *
208  * This function is used to explore the device tree from the root.
209  *------------------------------------------------------------------------*/
210 static void
211 usb_bus_explore(struct usb_proc_msg *pm)
212 {
213         struct usb_bus *bus;
214         struct usb_device *udev;
215
216         bus = ((struct usb_bus_msg *)pm)->bus;
217         udev = bus->devices[USB_ROOT_HUB_ADDR];
218
219         if (udev && udev->hub) {
220
221                 if (bus->do_probe) {
222                         bus->do_probe = 0;
223                         bus->driver_added_refcount++;
224                 }
225                 if (bus->driver_added_refcount == 0) {
226                         /* avoid zero, hence that is memory default */
227                         bus->driver_added_refcount = 1;
228                 }
229                 USB_BUS_UNLOCK(bus);
230
231                 mtx_lock(&Giant);
232
233                 /*
234                  * First update the USB power state!
235                  */
236                 usb_bus_powerd(bus);
237                 /*
238                  * Explore the Root USB HUB. This call can sleep,
239                  * exiting Giant, which is actually Giant.
240                  */
241                 (udev->hub->explore) (udev);
242
243                 mtx_unlock(&Giant);
244
245                 USB_BUS_LOCK(bus);
246         }
247         if (bus->bus_roothold != NULL) {
248                 root_mount_rel(bus->bus_roothold);
249                 bus->bus_roothold = NULL;
250         }
251 }
252
253 /*------------------------------------------------------------------------*
254  *      usb_bus_detach
255  *
256  * This function is used to detach the device tree from the root.
257  *------------------------------------------------------------------------*/
258 static void
259 usb_bus_detach(struct usb_proc_msg *pm)
260 {
261         struct usb_bus *bus;
262         struct usb_device *udev;
263         device_t dev;
264
265         bus = ((struct usb_bus_msg *)pm)->bus;
266         udev = bus->devices[USB_ROOT_HUB_ADDR];
267         dev = bus->bdev;
268         /* clear the softc */
269         device_set_softc(dev, NULL);
270         USB_BUS_UNLOCK(bus);
271
272         mtx_lock(&Giant);
273
274         /* detach children first */
275         bus_generic_detach(dev);
276
277         /*
278          * Free USB Root device, but not any sub-devices, hence they
279          * are freed by the caller of this function:
280          */
281         usb_free_device(udev,
282             USB_UNCFG_FLAG_FREE_EP0);
283
284         mtx_unlock(&Giant);
285         USB_BUS_LOCK(bus);
286         /* clear bdev variable last */
287         bus->bdev = NULL;
288 }
289
290 static void
291 usb_power_wdog(void *arg)
292 {
293         struct usb_bus *bus = arg;
294
295         USB_BUS_LOCK_ASSERT(bus, MA_OWNED);
296
297         usb_callout_reset(&bus->power_wdog,
298             4 * hz, usb_power_wdog, arg);
299
300         USB_BUS_UNLOCK(bus);
301
302         usb_bus_power_update(bus);
303
304         USB_BUS_LOCK(bus);
305 }
306
307 /*------------------------------------------------------------------------*
308  *      usb_bus_attach
309  *
310  * This function attaches USB in context of the explore thread.
311  *------------------------------------------------------------------------*/
312 static void
313 usb_bus_attach(struct usb_proc_msg *pm)
314 {
315         struct usb_bus *bus;
316         struct usb_device *child;
317         device_t dev;
318         usb_error_t err;
319         enum usb_dev_speed speed;
320
321         bus = ((struct usb_bus_msg *)pm)->bus;
322         dev = bus->bdev;
323
324         DPRINTF("\n");
325
326         switch (bus->usbrev) {
327         case USB_REV_1_0:
328                 speed = USB_SPEED_FULL;
329                 device_printf(bus->bdev, "12Mbps Full Speed USB v1.0\n");
330                 break;
331
332         case USB_REV_1_1:
333                 speed = USB_SPEED_FULL;
334                 device_printf(bus->bdev, "12Mbps Full Speed USB v1.1\n");
335                 break;
336
337         case USB_REV_2_0:
338                 speed = USB_SPEED_HIGH;
339                 device_printf(bus->bdev, "480Mbps High Speed USB v2.0\n");
340                 break;
341
342         case USB_REV_2_5:
343                 speed = USB_SPEED_VARIABLE;
344                 device_printf(bus->bdev, "480Mbps Wireless USB v2.5\n");
345                 break;
346
347         default:
348                 device_printf(bus->bdev, "Unsupported USB revision!\n");
349                 return;
350         }
351
352         USB_BUS_UNLOCK(bus);
353         mtx_lock(&Giant);               /* XXX not required by USB */
354
355         /* default power_mask value */
356         bus->hw_power_state =
357           USB_HW_POWER_CONTROL |
358           USB_HW_POWER_BULK |
359           USB_HW_POWER_INTERRUPT |
360           USB_HW_POWER_ISOC |
361           USB_HW_POWER_NON_ROOT_HUB;
362
363         /* make sure power is set at least once */
364
365         if (bus->methods->set_hw_power != NULL) {
366                 (bus->methods->set_hw_power) (bus);
367         }
368
369         /* Allocate the Root USB device */
370
371         child = usb_alloc_device(bus->bdev, bus, NULL, 0, 0, 1,
372             speed, USB_MODE_HOST);
373         if (child) {
374                 err = usb_probe_and_attach(child,
375                     USB_IFACE_INDEX_ANY);
376                 if (!err) {
377                         if ((bus->devices[USB_ROOT_HUB_ADDR] == NULL) ||
378                             (bus->devices[USB_ROOT_HUB_ADDR]->hub == NULL)) {
379                                 err = USB_ERR_NO_ROOT_HUB;
380                         }
381                 }
382         } else {
383                 err = USB_ERR_NOMEM;
384         }
385
386         mtx_unlock(&Giant);
387         USB_BUS_LOCK(bus);
388
389         if (err) {
390                 device_printf(bus->bdev, "Root HUB problem, error=%s\n",
391                     usbd_errstr(err));
392         }
393
394         /* set softc - we are ready */
395         device_set_softc(dev, bus);
396
397         /* start watchdog */
398         usb_power_wdog(bus);
399 }
400
401 /*------------------------------------------------------------------------*
402  *      usb_attach_sub
403  *
404  * This function creates a thread which runs the USB attach code. It
405  * is factored out, hence it can be called at two different places in
406  * time. During bootup this function is called from
407  * "usb_post_init". During hot-plug it is called directly from the
408  * "usb_attach()" method.
409  *------------------------------------------------------------------------*/
410 static void
411 usb_attach_sub(device_t dev, struct usb_bus *bus)
412 {
413         const char *pname = device_get_nameunit(dev);
414
415         /* Initialise USB process messages */
416         bus->explore_msg[0].hdr.pm_callback = &usb_bus_explore;
417         bus->explore_msg[0].bus = bus;
418         bus->explore_msg[1].hdr.pm_callback = &usb_bus_explore;
419         bus->explore_msg[1].bus = bus;
420
421         bus->detach_msg[0].hdr.pm_callback = &usb_bus_detach;
422         bus->detach_msg[0].bus = bus;
423         bus->detach_msg[1].hdr.pm_callback = &usb_bus_detach;
424         bus->detach_msg[1].bus = bus;
425
426         bus->attach_msg[0].hdr.pm_callback = &usb_bus_attach;
427         bus->attach_msg[0].bus = bus;
428         bus->attach_msg[1].hdr.pm_callback = &usb_bus_attach;
429         bus->attach_msg[1].bus = bus;
430
431         /* Create USB explore and callback processes */
432
433         if (usb_proc_create(&bus->giant_callback_proc,
434             &bus->bus_mtx, pname, USB_PRI_MED)) {
435                 printf("WARNING: Creation of USB Giant "
436                     "callback process failed.\n");
437         } else if (usb_proc_create(&bus->non_giant_callback_proc,
438             &bus->bus_mtx, pname, USB_PRI_HIGH)) {
439                 printf("WARNING: Creation of USB non-Giant "
440                     "callback process failed.\n");
441         } else if (usb_proc_create(&bus->explore_proc,
442             &bus->bus_mtx, pname, USB_PRI_MED)) {
443                 printf("WARNING: Creation of USB explore "
444                     "process failed.\n");
445         } else if (usb_proc_create(&bus->control_xfer_proc,
446             &bus->bus_mtx, pname, USB_PRI_MED)) {
447                 printf("WARNING: Creation of USB control transfer "
448                     "process failed.\n");
449         } else {
450                 /* Get final attach going */
451                 USB_BUS_LOCK(bus);
452                 if (usb_proc_msignal(&bus->explore_proc,
453                     &bus->attach_msg[0], &bus->attach_msg[1])) {
454                         /* ignore */
455                 }
456                 USB_BUS_UNLOCK(bus);
457         }
458 }
459
460 /*------------------------------------------------------------------------*
461  *      usb_post_init
462  *
463  * This function is called to attach all USB busses that were found
464  * during bootup.
465  *------------------------------------------------------------------------*/
466 static void
467 usb_post_init(void *arg)
468 {
469         struct usb_bus *bus;
470         devclass_t dc;
471         device_t dev;
472         int max;
473         int n;
474
475         mtx_lock(&Giant);
476
477         usb_devclass_ptr = devclass_find("usbus");
478
479         dc = usb_devclass_ptr;
480         if (dc) {
481                 max = devclass_get_maxunit(dc) + 1;
482                 for (n = 0; n != max; n++) {
483                         dev = devclass_get_device(dc, n);
484                         if (dev && device_is_attached(dev)) {
485                                 bus = device_get_ivars(dev);
486                                 if (bus) {
487                                         mtx_lock(&Giant);
488                                         usb_attach_sub(dev, bus);
489                                         mtx_unlock(&Giant);
490                                 }
491                         }
492                 }
493         } else {
494                 DPRINTFN(0, "no devclass\n");
495         }
496         usb_post_init_called = 1;
497
498         /* explore all USB busses in parallell */
499
500         usb_needs_explore_all();
501
502         mtx_unlock(&Giant);
503 }
504
505 SYSINIT(usb_post_init, SI_SUB_KICK_SCHEDULER, SI_ORDER_ANY, usb_post_init, NULL);
506 SYSUNINIT(usb_bus_unload, SI_SUB_KLD, SI_ORDER_ANY, usb_bus_unload, NULL);
507
508 /*------------------------------------------------------------------------*
509  *      usb_bus_mem_flush_all_cb
510  *------------------------------------------------------------------------*/
511 #if USB_HAVE_BUSDMA
512 static void
513 usb_bus_mem_flush_all_cb(struct usb_bus *bus, struct usb_page_cache *pc,
514     struct usb_page *pg, usb_size_t size, usb_size_t align)
515 {
516         usb_pc_cpu_flush(pc);
517 }
518 #endif
519
520 /*------------------------------------------------------------------------*
521  *      usb_bus_mem_flush_all - factored out code
522  *------------------------------------------------------------------------*/
523 #if USB_HAVE_BUSDMA
524 void
525 usb_bus_mem_flush_all(struct usb_bus *bus, usb_bus_mem_cb_t *cb)
526 {
527         if (cb) {
528                 cb(bus, &usb_bus_mem_flush_all_cb);
529         }
530 }
531 #endif
532
533 /*------------------------------------------------------------------------*
534  *      usb_bus_mem_alloc_all_cb
535  *------------------------------------------------------------------------*/
536 #if USB_HAVE_BUSDMA
537 static void
538 usb_bus_mem_alloc_all_cb(struct usb_bus *bus, struct usb_page_cache *pc,
539     struct usb_page *pg, usb_size_t size, usb_size_t align)
540 {
541         /* need to initialize the page cache */
542         pc->tag_parent = bus->dma_parent_tag;
543
544         if (usb_pc_alloc_mem(pc, pg, size, align)) {
545                 bus->alloc_failed = 1;
546         }
547 }
548 #endif
549
550 /*------------------------------------------------------------------------*
551  *      usb_bus_mem_alloc_all - factored out code
552  *
553  * Returns:
554  *    0: Success
555  * Else: Failure
556  *------------------------------------------------------------------------*/
557 uint8_t
558 usb_bus_mem_alloc_all(struct usb_bus *bus, bus_dma_tag_t dmat,
559     usb_bus_mem_cb_t *cb)
560 {
561         bus->alloc_failed = 0;
562
563         mtx_init(&bus->bus_mtx, device_get_nameunit(bus->parent),
564             NULL, MTX_DEF | MTX_RECURSE);
565
566         usb_callout_init_mtx(&bus->power_wdog,
567             &bus->bus_mtx, 0);
568
569         TAILQ_INIT(&bus->intr_q.head);
570
571 #if USB_HAVE_BUSDMA
572         usb_dma_tag_setup(bus->dma_parent_tag, bus->dma_tags,
573             dmat, &bus->bus_mtx, NULL, 32, USB_BUS_DMA_TAG_MAX);
574 #endif
575         if ((bus->devices_max > USB_MAX_DEVICES) ||
576             (bus->devices_max < USB_MIN_DEVICES) ||
577             (bus->devices == NULL)) {
578                 DPRINTFN(0, "Devices field has not been "
579                     "initialised properly!\n");
580                 bus->alloc_failed = 1;          /* failure */
581         }
582 #if USB_HAVE_BUSDMA
583         if (cb) {
584                 cb(bus, &usb_bus_mem_alloc_all_cb);
585         }
586 #endif
587         if (bus->alloc_failed) {
588                 usb_bus_mem_free_all(bus, cb);
589         }
590         return (bus->alloc_failed);
591 }
592
593 /*------------------------------------------------------------------------*
594  *      usb_bus_mem_free_all_cb
595  *------------------------------------------------------------------------*/
596 #if USB_HAVE_BUSDMA
597 static void
598 usb_bus_mem_free_all_cb(struct usb_bus *bus, struct usb_page_cache *pc,
599     struct usb_page *pg, usb_size_t size, usb_size_t align)
600 {
601         usb_pc_free_mem(pc);
602 }
603 #endif
604
605 /*------------------------------------------------------------------------*
606  *      usb_bus_mem_free_all - factored out code
607  *------------------------------------------------------------------------*/
608 void
609 usb_bus_mem_free_all(struct usb_bus *bus, usb_bus_mem_cb_t *cb)
610 {
611 #if USB_HAVE_BUSDMA
612         if (cb) {
613                 cb(bus, &usb_bus_mem_free_all_cb);
614         }
615         usb_dma_tag_unsetup(bus->dma_parent_tag);
616 #endif
617
618         mtx_destroy(&bus->bus_mtx);
619 }