wlan - Sync dev/netif/ath from FreeBSD part 4/N
[dragonfly.git] / sys / dev / netif / ath / ath / if_ath_descdma.c
1 /*-
2  * Copyright (c) 2002-2009 Sam Leffler, Errno Consulting
3  * 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  *    without modification.
11  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
12  *    similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any
13  *    redistribution must be conditioned upon including a substantially
14  *    similar Disclaimer requirement for further binary redistribution.
15  *
16  * NO WARRANTY
17  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
18  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
19  * LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY
20  * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
21  * THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY,
22  * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
23  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
24  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
25  * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
26  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
27  * THE POSSIBILITY OF SUCH DAMAGES.
28  */
29
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD$");
32
33 /*
34  * Driver for the Atheros Wireless LAN controller.
35  *
36  * This software is derived from work of Atsushi Onoe; his contribution
37  * is greatly appreciated.
38  */
39
40 #include "opt_inet.h"
41 #include "opt_ath.h"
42 /*
43  * This is needed for register operations which are performed
44  * by the driver - eg, calls to ath_hal_gettsf32().
45  *
46  * It's also required for any AH_DEBUG checks in here, eg the
47  * module dependencies.
48  */
49 #include "opt_ah.h"
50 #include "opt_wlan.h"
51
52 #include <sys/param.h>
53 #include <sys/systm.h>
54 #include <sys/sysctl.h>
55 #include <sys/mbuf.h>
56 #include <sys/malloc.h>
57 #include <sys/lock.h>
58 #include <sys/mutex.h>
59 #include <sys/kernel.h>
60 #include <sys/socket.h>
61 #include <sys/sockio.h>
62 #include <sys/errno.h>
63 #include <sys/callout.h>
64 #include <sys/bus.h>
65 #include <sys/endian.h>
66 #include <sys/kthread.h>
67 #include <sys/taskqueue.h>
68 #include <sys/priv.h>
69 #include <sys/module.h>
70 #include <sys/ktr.h>
71 #include <sys/smp.h>    /* for mp_ncpus */
72
73 #include <machine/bus.h>
74
75 #include <net/if.h>
76 #include <net/if_var.h>
77 #include <net/if_dl.h>
78 #include <net/if_media.h>
79 #include <net/if_types.h>
80 #include <net/if_arp.h>
81 #include <net/ethernet.h>
82 #include <net/if_llc.h>
83
84 #include <net80211/ieee80211_var.h>
85 #include <net80211/ieee80211_regdomain.h>
86 #ifdef IEEE80211_SUPPORT_SUPERG
87 #include <net80211/ieee80211_superg.h>
88 #endif
89 #ifdef IEEE80211_SUPPORT_TDMA
90 #include <net80211/ieee80211_tdma.h>
91 #endif
92
93 #include <net/bpf.h>
94
95 #ifdef INET
96 #include <netinet/in.h>
97 #include <netinet/if_ether.h>
98 #endif
99
100 #include <dev/ath/if_athvar.h>
101 #include <dev/ath/ath_hal/ah_devid.h>           /* XXX for softled */
102 #include <dev/ath/ath_hal/ah_diagcodes.h>
103
104 #include <dev/ath/if_ath_debug.h>
105 #include <dev/ath/if_ath_misc.h>
106 #if 0
107 #include <dev/ath/if_ath_tsf.h>
108 #include <dev/ath/if_ath_tx.h>
109 #include <dev/ath/if_ath_sysctl.h>
110 #include <dev/ath/if_ath_led.h>
111 #include <dev/ath/if_ath_keycache.h>
112 #include <dev/ath/if_ath_rx.h>
113 #include <dev/ath/if_ath_rx_edma.h>
114 #include <dev/ath/if_ath_tx_edma.h>
115 #include <dev/ath/if_ath_beacon.h>
116 #include <dev/ath/if_ath_btcoex.h>
117 #include <dev/ath/if_ath_spectral.h>
118 #include <dev/ath/if_ath_lna_div.h>
119 #include <dev/ath/if_athdfs.h>
120 #endif
121 #include <dev/ath/if_ath_descdma.h>
122
123 MALLOC_DECLARE(M_ATHDEV);
124
125 /*
126  * This is the descriptor setup / busdma memory intialisation and
127  * teardown routines.
128  */
129
130 static void
131 ath_load_cb(void *arg, bus_dma_segment_t *segs, int nsegs, int error)
132 {
133         bus_addr_t *paddr = (bus_addr_t*) arg;
134         KASSERT(error == 0, ("error %u on bus_dma callback", error));
135         *paddr = segs->ds_addr;
136 }
137
138 /*
139  * Allocate the descriptors and appropriate DMA tag/setup.
140  *
141  * For some situations (eg EDMA TX completion), there isn't a requirement
142  * for the ath_buf entries to be allocated.
143  */
144 int
145 ath_descdma_alloc_desc(struct ath_softc *sc,
146         struct ath_descdma *dd, ath_bufhead *head,
147         const char *name, int ds_size, int ndesc)
148 {
149 #define DS2PHYS(_dd, _ds) \
150         ((_dd)->dd_desc_paddr + ((caddr_t)(_ds) - (caddr_t)(_dd)->dd_desc))
151 #define ATH_DESC_4KB_BOUND_CHECK(_daddr, _len) \
152         ((((u_int32_t)(_daddr) & 0xFFF) > (0x1000 - (_len))) ? 1 : 0)
153         int error;
154
155         dd->dd_descsize = ds_size;
156
157         DPRINTF(sc, ATH_DEBUG_RESET,
158             "%s: %s DMA: %u desc, %d bytes per descriptor\n",
159             __func__, name, ndesc, dd->dd_descsize);
160
161         dd->dd_name = name;
162         dd->dd_desc_len = dd->dd_descsize * ndesc;
163
164         /*
165          * Merlin work-around:
166          * Descriptors that cross the 4KB boundary can't be used.
167          * Assume one skipped descriptor per 4KB page.
168          */
169         if (! ath_hal_split4ktrans(sc->sc_ah)) {
170                 int numpages = dd->dd_desc_len / 4096;
171                 dd->dd_desc_len += ds_size * numpages;
172         }
173
174         /*
175          * Setup DMA descriptor area.
176          *
177          * BUS_DMA_ALLOCNOW is not used; we never use bounce
178          * buffers for the descriptors themselves.
179          */
180         error = bus_dma_tag_create(bus_get_dma_tag(sc->sc_dev), /* parent */
181                        PAGE_SIZE, 0,            /* alignment, bounds */
182                        BUS_SPACE_MAXADDR_32BIT, /* lowaddr */
183                        BUS_SPACE_MAXADDR,       /* highaddr */
184                        NULL, NULL,              /* filter, filterarg */
185                        dd->dd_desc_len,         /* maxsize */
186                        1,                       /* nsegments */
187                        dd->dd_desc_len,         /* maxsegsize */
188                        0,                       /* flags */
189                        NULL,                    /* lockfunc */
190                        NULL,                    /* lockarg */
191                        &dd->dd_dmat);
192         if (error != 0) {
193                 device_printf(sc->sc_dev,
194                     "cannot allocate %s DMA tag\n", dd->dd_name);
195                 return error;
196         }
197
198         /* allocate descriptors */
199         error = bus_dmamem_alloc(dd->dd_dmat, (void**) &dd->dd_desc,
200                                  BUS_DMA_NOWAIT | BUS_DMA_COHERENT,
201                                  &dd->dd_dmamap);
202         if (error != 0) {
203                 device_printf(sc->sc_dev,
204                     "unable to alloc memory for %u %s descriptors, error %u\n",
205                     ndesc, dd->dd_name, error);
206                 goto fail1;
207         }
208
209         error = bus_dmamap_load(dd->dd_dmat, dd->dd_dmamap,
210                                 dd->dd_desc, dd->dd_desc_len,
211                                 ath_load_cb, &dd->dd_desc_paddr,
212                                 BUS_DMA_NOWAIT);
213         if (error != 0) {
214                 device_printf(sc->sc_dev,
215                     "unable to map %s descriptors, error %u\n",
216                     dd->dd_name, error);
217                 goto fail2;
218         }
219
220         DPRINTF(sc, ATH_DEBUG_RESET, "%s: %s DMA map: %p (%lu) -> %p (%lu)\n",
221             __func__, dd->dd_name, (uint8_t *) dd->dd_desc,
222             (u_long) dd->dd_desc_len, (caddr_t) dd->dd_desc_paddr,
223             /*XXX*/ (u_long) dd->dd_desc_len);
224
225         return (0);
226
227 fail2:
228         bus_dmamem_free(dd->dd_dmat, dd->dd_desc, dd->dd_dmamap);
229 fail1:
230         bus_dma_tag_destroy(dd->dd_dmat);
231         memset(dd, 0, sizeof(*dd));
232         return error;
233 #undef DS2PHYS
234 #undef ATH_DESC_4KB_BOUND_CHECK
235 }
236
237 int
238 ath_descdma_setup(struct ath_softc *sc,
239         struct ath_descdma *dd, ath_bufhead *head,
240         const char *name, int ds_size, int nbuf, int ndesc)
241 {
242 #define DS2PHYS(_dd, _ds) \
243         ((_dd)->dd_desc_paddr + ((caddr_t)(_ds) - (caddr_t)(_dd)->dd_desc))
244 #define ATH_DESC_4KB_BOUND_CHECK(_daddr, _len) \
245         ((((u_int32_t)(_daddr) & 0xFFF) > (0x1000 - (_len))) ? 1 : 0)
246         uint8_t *ds;
247         struct ath_buf *bf;
248         int i, bsize, error;
249
250         /* Allocate descriptors */
251         error = ath_descdma_alloc_desc(sc, dd, head, name, ds_size,
252             nbuf * ndesc);
253
254         /* Assume any errors during allocation were dealt with */
255         if (error != 0) {
256                 return (error);
257         }
258
259         ds = (uint8_t *) dd->dd_desc;
260
261         /* allocate rx buffers */
262         bsize = sizeof(struct ath_buf) * nbuf;
263         bf = malloc(bsize, M_ATHDEV, M_NOWAIT | M_ZERO);
264         if (bf == NULL) {
265                 device_printf(sc->sc_dev,
266                     "malloc of %s buffers failed, size %u\n",
267                     dd->dd_name, bsize);
268                 goto fail3;
269         }
270         dd->dd_bufptr = bf;
271
272         TAILQ_INIT(head);
273         for (i = 0; i < nbuf; i++, bf++, ds += (ndesc * dd->dd_descsize)) {
274                 bf->bf_desc = (struct ath_desc *) ds;
275                 bf->bf_daddr = DS2PHYS(dd, ds);
276                 if (! ath_hal_split4ktrans(sc->sc_ah)) {
277                         /*
278                          * Merlin WAR: Skip descriptor addresses which
279                          * cause 4KB boundary crossing along any point
280                          * in the descriptor.
281                          */
282                          if (ATH_DESC_4KB_BOUND_CHECK(bf->bf_daddr,
283                              dd->dd_descsize)) {
284                                 /* Start at the next page */
285                                 ds += 0x1000 - (bf->bf_daddr & 0xFFF);
286                                 bf->bf_desc = (struct ath_desc *) ds;
287                                 bf->bf_daddr = DS2PHYS(dd, ds);
288                         }
289                 }
290                 error = bus_dmamap_create(sc->sc_dmat, BUS_DMA_NOWAIT,
291                                 &bf->bf_dmamap);
292                 if (error != 0) {
293                         device_printf(sc->sc_dev, "unable to create dmamap "
294                             "for %s buffer %u, error %u\n",
295                             dd->dd_name, i, error);
296                         ath_descdma_cleanup(sc, dd, head);
297                         return error;
298                 }
299                 bf->bf_lastds = bf->bf_desc;    /* Just an initial value */
300                 TAILQ_INSERT_TAIL(head, bf, bf_list);
301         }
302
303         /*
304          * XXX TODO: ensure that ds doesn't overflow the descriptor
305          * allocation otherwise weird stuff will occur and crash your
306          * machine.
307          */
308         return 0;
309         /* XXX this should likely just call ath_descdma_cleanup() */
310 fail3:
311         bus_dmamap_unload(dd->dd_dmat, dd->dd_dmamap);
312         bus_dmamem_free(dd->dd_dmat, dd->dd_desc, dd->dd_dmamap);
313         bus_dma_tag_destroy(dd->dd_dmat);
314         memset(dd, 0, sizeof(*dd));
315         return error;
316 #undef DS2PHYS
317 #undef ATH_DESC_4KB_BOUND_CHECK
318 }
319
320 /*
321  * Allocate ath_buf entries but no descriptor contents.
322  *
323  * This is for RX EDMA where the descriptors are the header part of
324  * the RX buffer.
325  */
326 int
327 ath_descdma_setup_rx_edma(struct ath_softc *sc,
328         struct ath_descdma *dd, ath_bufhead *head,
329         const char *name, int nbuf, int rx_status_len)
330 {
331         struct ath_buf *bf;
332         int i, bsize, error;
333
334         DPRINTF(sc, ATH_DEBUG_RESET, "%s: %s DMA: %u buffers\n",
335             __func__, name, nbuf);
336
337         dd->dd_name = name;
338         /*
339          * This is (mostly) purely for show.  We're not allocating any actual
340          * descriptors here as EDMA RX has the descriptor be part
341          * of the RX buffer.
342          *
343          * However, dd_desc_len is used by ath_descdma_free() to determine
344          * whether we have already freed this DMA mapping.
345          */
346         dd->dd_desc_len = rx_status_len * nbuf;
347         dd->dd_descsize = rx_status_len;
348
349         /* allocate rx buffers */
350         bsize = sizeof(struct ath_buf) * nbuf;
351         bf = malloc(bsize, M_ATHDEV, M_NOWAIT | M_ZERO);
352         if (bf == NULL) {
353                 device_printf(sc->sc_dev,
354                     "malloc of %s buffers failed, size %u\n",
355                     dd->dd_name, bsize);
356                 error = ENOMEM;
357                 goto fail3;
358         }
359         dd->dd_bufptr = bf;
360
361         TAILQ_INIT(head);
362         for (i = 0; i < nbuf; i++, bf++) {
363                 bf->bf_desc = NULL;
364                 bf->bf_daddr = 0;
365                 bf->bf_lastds = NULL;   /* Just an initial value */
366
367                 error = bus_dmamap_create(sc->sc_dmat, BUS_DMA_NOWAIT,
368                                 &bf->bf_dmamap);
369                 if (error != 0) {
370                         device_printf(sc->sc_dev, "unable to create dmamap "
371                             "for %s buffer %u, error %u\n",
372                             dd->dd_name, i, error);
373                         ath_descdma_cleanup(sc, dd, head);
374                         return error;
375                 }
376                 TAILQ_INSERT_TAIL(head, bf, bf_list);
377         }
378         return 0;
379 fail3:
380         memset(dd, 0, sizeof(*dd));
381         return error;
382 }
383
384 void
385 ath_descdma_cleanup(struct ath_softc *sc,
386         struct ath_descdma *dd, ath_bufhead *head)
387 {
388         struct ath_buf *bf;
389         struct ieee80211_node *ni;
390         int do_warning = 0;
391
392         if (dd->dd_dmamap != 0) {
393                 bus_dmamap_unload(dd->dd_dmat, dd->dd_dmamap);
394                 bus_dmamem_free(dd->dd_dmat, dd->dd_desc, dd->dd_dmamap);
395                 bus_dma_tag_destroy(dd->dd_dmat);
396         }
397
398         if (head != NULL) {
399                 TAILQ_FOREACH(bf, head, bf_list) {
400                         if (bf->bf_m) {
401                                 /*
402                                  * XXX warn if there's buffers here.
403                                  * XXX it should have been freed by the
404                                  * owner!
405                                  */
406                                 
407                                 if (do_warning == 0) {
408                                         do_warning = 1;
409                                         device_printf(sc->sc_dev,
410                                             "%s: %s: mbuf should've been"
411                                             " unmapped/freed!\n",
412                                             __func__,
413                                             dd->dd_name);
414                                 }
415                                 bus_dmamap_sync(sc->sc_dmat, bf->bf_dmamap,
416                                     BUS_DMASYNC_POSTREAD);
417                                 bus_dmamap_unload(sc->sc_dmat, bf->bf_dmamap);
418                                 m_freem(bf->bf_m);
419                                 bf->bf_m = NULL;
420                         }
421                         if (bf->bf_dmamap != NULL) {
422                                 bus_dmamap_destroy(sc->sc_dmat, bf->bf_dmamap);
423                                 bf->bf_dmamap = NULL;
424                         }
425                         ni = bf->bf_node;
426                         bf->bf_node = NULL;
427                         if (ni != NULL) {
428                                 /*
429                                  * Reclaim node reference.
430                                  */
431                                 ieee80211_free_node(ni);
432                         }
433                 }
434         }
435
436         if (head != NULL)
437                 TAILQ_INIT(head);
438
439         if (dd->dd_bufptr != NULL)
440                 free(dd->dd_bufptr, M_ATHDEV);
441         memset(dd, 0, sizeof(*dd));
442 }