drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcdc.c

   1 /*
   2  * Copyright (c) 2010 Broadcom Corporation
   3  *
   4  * Permission to use, copy, modify, and/or distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice appear in all copies.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
  11  * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
  13  * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
  14  * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  15  */
  16
  17 /*******************************************************************************
  18  * Communicates with the dongle by using dcmd codes.
  19  * For certain dcmd codes, the dongle interprets string data from the host.
  20  ******************************************************************************/
  21
  22 #include <linux/types.h>
  23 #include <linux/netdevice.h>
  24
  25 #include <brcmu_utils.h>
  26 #include <brcmu_wifi.h>
  27
  28 #include "core.h"
  29 #include "bus.h"
  30 #include "fwsignal.h"
  31 #include "debug.h"
  32 #include "tracepoint.h"
  33 #include "proto.h"
  34 #include "bcdc.h"
  35
  36 struct brcmf_proto_bcdc_dcmd {
  37         __le32 cmd;     /* dongle command value */
  38         __le32 len;     /* lower 16: output buflen;
  39                          * upper 16: input buflen (excludes header) */
  40         __le32 flags;   /* flag defns given below */
  41         __le32 status;  /* status code returned from the device */
  42 };
  43
  44 /* BCDC flag definitions */
  45 #define BCDC_DCMD_ERROR         0x01            /* 1=cmd failed */
  46 #define BCDC_DCMD_SET           0x02            /* 0=get, 1=set cmd */
  47 #define BCDC_DCMD_IF_MASK       0xF000          /* I/F index */
  48 #define BCDC_DCMD_IF_SHIFT      12
  49 #define BCDC_DCMD_ID_MASK       0xFFFF0000      /* id an cmd pairing */
  50 #define BCDC_DCMD_ID_SHIFT      16              /* ID Mask shift bits */
  51 #define BCDC_DCMD_ID(flags)     \
  52         (((flags) & BCDC_DCMD_ID_MASK) >> BCDC_DCMD_ID_SHIFT)
  53
  54 /*
  55  * BCDC header - Broadcom specific extension of CDC.
  56  * Used on data packets to convey priority across USB.
  57  */
  58 #define BCDC_HEADER_LEN         4
  59 #define BCDC_PROTO_VER          2       /* Protocol version */
  60 #define BCDC_FLAG_VER_MASK      0xf0    /* Protocol version mask */
  61 #define BCDC_FLAG_VER_SHIFT     4       /* Protocol version shift */
  62 #define BCDC_FLAG_SUM_GOOD      0x04    /* Good RX checksums */
  63 #define BCDC_FLAG_SUM_NEEDED    0x08    /* Dongle needs to do TX checksums */
  64 #define BCDC_PRIORITY_MASK      0x7
  65 #define BCDC_FLAG2_IF_MASK      0x0f    /* packet rx interface in APSTA */
  66 #define BCDC_FLAG2_IF_SHIFT     0
  67
  68 #define BCDC_GET_IF_IDX(hdr) \
  69         ((int)((((hdr)->flags2) & BCDC_FLAG2_IF_MASK) >> BCDC_FLAG2_IF_SHIFT))
  70 #define BCDC_SET_IF_IDX(hdr, idx) \
  71         ((hdr)->flags2 = (((hdr)->flags2 & ~BCDC_FLAG2_IF_MASK) | \
  72         ((idx) << BCDC_FLAG2_IF_SHIFT)))
  73
  74 /**
  75  * struct brcmf_proto_bcdc_header - BCDC header format
  76  *
  77  * @flags: flags contain protocol and checksum info.
  78  * @priority: 802.1d priority and USB flow control info (bit 4:7).
  79  * @flags2: additional flags containing dongle interface index.
  80  * @data_offset: start of packet data. header is following by firmware signals.
  81  */
  82 struct brcmf_proto_bcdc_header {
  83         u8 flags;
  84         u8 priority;
  85         u8 flags2;
  86         u8 data_offset;
  87 };
  88
  89 /*
  90  * maximum length of firmware signal data between
  91  * the BCDC header and packet data in the tx path.
  92  */
  93 #define BRCMF_PROT_FW_SIGNAL_MAX_TXBYTES        12
  94
  95 #define RETRIES 2 /* # of retries to retrieve matching dcmd response */
  96 #define BUS_HEADER_LEN  (16+64)         /* Must be atleast SDPCM_RESERVE
  97                                          * (amount of header tha might be added)
  98                                          * plus any space that might be needed
  99                                          * for bus alignment padding.
 100                                          */
 101 struct brcmf_bcdc {
 102         u16 reqid;
 103         u8 bus_header[BUS_HEADER_LEN];
 104         struct brcmf_proto_bcdc_dcmd msg;
 105         unsigned char buf[BRCMF_DCMD_MAXLEN];
 106         struct brcmf_fws_info *fws;
 107 };
 108
 109
 110 struct brcmf_fws_info *drvr_to_fws(struct brcmf_pub *drvr)
 111 {
 112         struct brcmf_bcdc *bcdc = drvr->proto->pd;
 113
 114         return bcdc->fws;
 115 }
 116
 117 static int
 118 brcmf_proto_bcdc_msg(struct brcmf_pub *drvr, int ifidx, uint cmd, void *buf,
 119                      uint len, bool set)
 120 {
 121         struct brcmf_bcdc *bcdc = (struct brcmf_bcdc *)drvr->proto->pd;
 122         struct brcmf_proto_bcdc_dcmd *msg = &bcdc->msg;
 123         u32 flags;
 124
 125         brcmf_dbg(BCDC, "Enter\n");
 126
 127         memset(msg, 0, sizeof(struct brcmf_proto_bcdc_dcmd));
 128
 129         msg->cmd = cpu_to_le32(cmd);
 130         msg->len = cpu_to_le32(len);
 131         flags = (++bcdc->reqid << BCDC_DCMD_ID_SHIFT);
 132         if (set)
 133                 flags |= BCDC_DCMD_SET;
 134         flags = (flags & ~BCDC_DCMD_IF_MASK) |
 135                 (ifidx << BCDC_DCMD_IF_SHIFT);
 136         msg->flags = cpu_to_le32(flags);
 137
 138         if (buf)
 139                 memcpy(bcdc->buf, buf, len);
 140
 141         len += sizeof(*msg);
 142         if (len > BRCMF_TX_IOCTL_MAX_MSG_SIZE)
 143                 len = BRCMF_TX_IOCTL_MAX_MSG_SIZE;
 144
 145         /* Send request */
 146         return brcmf_bus_txctl(drvr->bus_if, (unsigned char *)&bcdc->msg, len);
 147 }
 148
 149 static int brcmf_proto_bcdc_cmplt(struct brcmf_pub *drvr, u32 id, u32 len)
 150 {
 151         int ret;
 152         struct brcmf_bcdc *bcdc = (struct brcmf_bcdc *)drvr->proto->pd;
 153
 154         brcmf_dbg(BCDC, "Enter\n");
 155         len += sizeof(struct brcmf_proto_bcdc_dcmd);
 156         do {
 157                 ret = brcmf_bus_rxctl(drvr->bus_if, (unsigned char *)&bcdc->msg,
 158                                       len);
 159                 if (ret < 0)
 160                         break;
 161         } while (BCDC_DCMD_ID(le32_to_cpu(bcdc->msg.flags)) != id);
 162
 163         return ret;
 164 }
 165
 166 static int
 167 brcmf_proto_bcdc_query_dcmd(struct brcmf_pub *drvr, int ifidx, uint cmd,
 168                             void *buf, uint len, int *fwerr)
 169 {
 170         struct brcmf_bcdc *bcdc = (struct brcmf_bcdc *)drvr->proto->pd;
 171         struct brcmf_proto_bcdc_dcmd *msg = &bcdc->msg;
 172         void *info;
 173         int ret = 0, retries = 0;
 174         u32 id, flags;
 175
 176         brcmf_dbg(BCDC, "Enter, cmd %d len %d\n", cmd, len);
 177
 178         *fwerr = 0;
 179         ret = brcmf_proto_bcdc_msg(drvr, ifidx, cmd, buf, len, false);
 180         if (ret < 0) {
 181                 brcmf_err("brcmf_proto_bcdc_msg failed w/status %d\n",
 182                           ret);
 183                 goto done;
 184         }
 185
 186 retry:
 187         /* wait for interrupt and get first fragment */
 188         ret = brcmf_proto_bcdc_cmplt(drvr, bcdc->reqid, len);
 189         if (ret < 0)
 190                 goto done;
 191
 192         flags = le32_to_cpu(msg->flags);
 193         id = (flags & BCDC_DCMD_ID_MASK) >> BCDC_DCMD_ID_SHIFT;
 194
 195         if ((id < bcdc->reqid) && (++retries < RETRIES))
 196                 goto retry;
 197         if (id != bcdc->reqid) {
 198                 brcmf_err("%s: unexpected request id %d (expected %d)\n",
 199                           brcmf_ifname(brcmf_get_ifp(drvr, ifidx)), id,
 200                           bcdc->reqid);
 201                 ret = -EINVAL;
 202                 goto done;
 203         }
 204
 205         /* Check info buffer */
 206         info = (void *)&bcdc->buf[0];
 207
 208         /* Copy info buffer */
 209         if (buf) {
 210                 if (ret < (int)len)
 211                         len = ret;
 212                 memcpy(buf, info, len);
 213         }
 214
 215         ret = 0;
 216
 217         /* Check the ERROR flag */
 218         if (flags & BCDC_DCMD_ERROR)
 219                 *fwerr = le32_to_cpu(msg->status);
 220 done:
 221         return ret;
 222 }
 223
 224 static int
 225 brcmf_proto_bcdc_set_dcmd(struct brcmf_pub *drvr, int ifidx, uint cmd,
 226                           void *buf, uint len, int *fwerr)
 227 {
 228         struct brcmf_bcdc *bcdc = (struct brcmf_bcdc *)drvr->proto->pd;
 229         struct brcmf_proto_bcdc_dcmd *msg = &bcdc->msg;
 230         int ret;
 231         u32 flags, id;
 232
 233         brcmf_dbg(BCDC, "Enter, cmd %d len %d\n", cmd, len);
 234
 235         *fwerr = 0;
 236         ret = brcmf_proto_bcdc_msg(drvr, ifidx, cmd, buf, len, true);
 237         if (ret < 0)
 238                 goto done;
 239
 240         ret = brcmf_proto_bcdc_cmplt(drvr, bcdc->reqid, len);
 241         if (ret < 0)
 242                 goto done;
 243
 244         flags = le32_to_cpu(msg->flags);
 245         id = (flags & BCDC_DCMD_ID_MASK) >> BCDC_DCMD_ID_SHIFT;
 246
 247         if (id != bcdc->reqid) {
 248                 brcmf_err("%s: unexpected request id %d (expected %d)\n",
 249                           brcmf_ifname(brcmf_get_ifp(drvr, ifidx)), id,
 250                           bcdc->reqid);
 251                 ret = -EINVAL;
 252                 goto done;
 253         }
 254
 255         ret = 0;
 256
 257         /* Check the ERROR flag */
 258         if (flags & BCDC_DCMD_ERROR)
 259                 *fwerr = le32_to_cpu(msg->status);
 260
 261 done:
 262         return ret;
 263 }
 264
 265 static void
 266 brcmf_proto_bcdc_hdrpush(struct brcmf_pub *drvr, int ifidx, u8 offset,
 267                          struct sk_buff *pktbuf)
 268 {
 269         struct brcmf_proto_bcdc_header *h;
 270
 271         brcmf_dbg(BCDC, "Enter\n");
 272
 273         /* Push BDC header used to convey priority for buses that don't */
 274         skb_push(pktbuf, BCDC_HEADER_LEN);
 275
 276         h = (struct brcmf_proto_bcdc_header *)(pktbuf->data);
 277
 278         h->flags = (BCDC_PROTO_VER << BCDC_FLAG_VER_SHIFT);
 279         if (pktbuf->ip_summed == CHECKSUM_PARTIAL)
 280                 h->flags |= BCDC_FLAG_SUM_NEEDED;
 281
 282         h->priority = (pktbuf->priority & BCDC_PRIORITY_MASK);
 283         h->flags2 = 0;
 284         h->data_offset = offset;
 285         BCDC_SET_IF_IDX(h, ifidx);
 286         trace_brcmf_bcdchdr(pktbuf->data);
 287 }
 288
 289 static int
 290 brcmf_proto_bcdc_hdrpull(struct brcmf_pub *drvr, bool do_fws,
 291                          struct sk_buff *pktbuf, struct brcmf_if **ifp)
 292 {
 293         struct brcmf_proto_bcdc_header *h;
 294         struct brcmf_if *tmp_if;
 295
 296         brcmf_dbg(BCDC, "Enter\n");
 297
 298         /* Pop BCDC header used to convey priority for buses that don't */
 299         if (pktbuf->len <= BCDC_HEADER_LEN) {
 300                 brcmf_dbg(INFO, "rx data too short (%d <= %d)\n",
 301                           pktbuf->len, BCDC_HEADER_LEN);
 302                 return -EBADE;
 303         }
 304
 305         trace_brcmf_bcdchdr(pktbuf->data);
 306         h = (struct brcmf_proto_bcdc_header *)(pktbuf->data);
 307
 308         tmp_if = brcmf_get_ifp(drvr, BCDC_GET_IF_IDX(h));
 309         if (!tmp_if) {
 310                 brcmf_dbg(INFO, "no matching ifp found\n");
 311                 return -EBADE;
 312         }
 313         if (((h->flags & BCDC_FLAG_VER_MASK) >> BCDC_FLAG_VER_SHIFT) !=
 314             BCDC_PROTO_VER) {
 315                 brcmf_err("%s: non-BCDC packet received, flags 0x%x\n",
 316                           brcmf_ifname(tmp_if), h->flags);
 317                 return -EBADE;
 318         }
 319
 320         if (h->flags & BCDC_FLAG_SUM_GOOD) {
 321                 brcmf_dbg(BCDC, "%s: BDC rcv, good checksum, flags 0x%x\n",
 322                           brcmf_ifname(tmp_if), h->flags);
 323                 pktbuf->ip_summed = CHECKSUM_UNNECESSARY;
 324         }
 325
 326         pktbuf->priority = h->priority & BCDC_PRIORITY_MASK;
 327
 328         skb_pull(pktbuf, BCDC_HEADER_LEN);
 329         if (do_fws)
 330                 brcmf_fws_hdrpull(tmp_if, h->data_offset << 2, pktbuf);
 331         else
 332                 skb_pull(pktbuf, h->data_offset << 2);
 333
 334         if (pktbuf->len == 0)
 335                 return -ENODATA;
 336
 337         if (ifp != NULL)
 338                 *ifp = tmp_if;
 339         return 0;
 340 }
 341
 342 static int brcmf_proto_bcdc_tx_queue_data(struct brcmf_pub *drvr, int ifidx,
 343                                           struct sk_buff *skb)
 344 {
 345         struct brcmf_if *ifp = brcmf_get_ifp(drvr, ifidx);
 346         struct brcmf_bcdc *bcdc = drvr->proto->pd;
 347
 348         if (!brcmf_fws_queue_skbs(bcdc->fws))
 349                 return brcmf_proto_txdata(drvr, ifidx, 0, skb);
 350
 351         return brcmf_fws_process_skb(ifp, skb);
 352 }
 353
 354 static int
 355 brcmf_proto_bcdc_txdata(struct brcmf_pub *drvr, int ifidx, u8 offset,
 356                         struct sk_buff *pktbuf)
 357 {
 358         brcmf_proto_bcdc_hdrpush(drvr, ifidx, offset, pktbuf);
 359         return brcmf_bus_txdata(drvr->bus_if, pktbuf);
 360 }
 361
 362 void brcmf_proto_bcdc_txflowblock(struct device *dev, bool state)
 363 {
 364         struct brcmf_bus *bus_if = dev_get_drvdata(dev);
 365         struct brcmf_pub *drvr = bus_if->drvr;
 366
 367         brcmf_dbg(TRACE, "Enter\n");
 368
 369         brcmf_fws_bus_blocked(drvr, state);
 370 }
 371
 372 void
 373 brcmf_proto_bcdc_txcomplete(struct device *dev, struct sk_buff *txp,
 374                             bool success)
 375 {
 376         struct brcmf_bus *bus_if = dev_get_drvdata(dev);
 377         struct brcmf_bcdc *bcdc = bus_if->drvr->proto->pd;
 378         struct brcmf_if *ifp;
 379
 380         /* await txstatus signal for firmware if active */
 381         if (brcmf_fws_fc_active(bcdc->fws)) {
 382                 if (!success)
 383                         brcmf_fws_bustxfail(bcdc->fws, txp);
 384         } else {
 385                 if (brcmf_proto_bcdc_hdrpull(bus_if->drvr, false, txp, &ifp))
 386                         brcmu_pkt_buf_free_skb(txp);
 387                 else
 388                         brcmf_txfinalize(ifp, txp, success);
 389         }
 390 }
 391
 392 static void
 393 brcmf_proto_bcdc_configure_addr_mode(struct brcmf_pub *drvr, int ifidx,
 394                                      enum proto_addr_mode addr_mode)
 395 {
 396 }
 397
 398 static void
 399 brcmf_proto_bcdc_delete_peer(struct brcmf_pub *drvr, int ifidx,
 400                              u8 peer[ETH_ALEN])
 401 {
 402 }
 403
 404 static void
 405 brcmf_proto_bcdc_add_tdls_peer(struct brcmf_pub *drvr, int ifidx,
 406                                u8 peer[ETH_ALEN])
 407 {
 408 }
 409
 410 static void brcmf_proto_bcdc_rxreorder(struct brcmf_if *ifp,
 411                                        struct sk_buff *skb)
 412 {
 413         brcmf_fws_rxreorder(ifp, skb);
 414 }
 415
 416 static void
 417 brcmf_proto_bcdc_add_if(struct brcmf_if *ifp)
 418 {
 419         brcmf_fws_add_interface(ifp);
 420 }
 421
 422 static void
 423 brcmf_proto_bcdc_del_if(struct brcmf_if *ifp)
 424 {
 425         brcmf_fws_del_interface(ifp);
 426 }
 427
 428 static void
 429 brcmf_proto_bcdc_reset_if(struct brcmf_if *ifp)
 430 {
 431         brcmf_fws_reset_interface(ifp);
 432 }
 433
 434 static int
 435 brcmf_proto_bcdc_init_done(struct brcmf_pub *drvr)
 436 {
 437         struct brcmf_bcdc *bcdc = drvr->proto->pd;
 438         struct brcmf_fws_info *fws;
 439
 440         fws = brcmf_fws_attach(drvr);
 441         if (IS_ERR(fws))
 442                 return PTR_ERR(fws);
 443
 444         bcdc->fws = fws;
 445         return 0;
 446 }
 447
 448 static void brcmf_proto_bcdc_debugfs_create(struct brcmf_pub *drvr)
 449 {
 450         brcmf_fws_debugfs_create(drvr);
 451 }
 452
 453 int brcmf_proto_bcdc_attach(struct brcmf_pub *drvr)
 454 {
 455         struct brcmf_bcdc *bcdc;
 456
 457         bcdc = kzalloc(sizeof(*bcdc), GFP_ATOMIC);
 458         if (!bcdc)
 459                 goto fail;
 460
 461         /* ensure that the msg buf directly follows the cdc msg struct */
 462         if ((unsigned long)(&bcdc->msg + 1) != (unsigned long)bcdc->buf) {
 463                 brcmf_err("struct brcmf_proto_bcdc is not correctly defined\n");
 464                 goto fail;
 465         }
 466
 467         drvr->proto->hdrpull = brcmf_proto_bcdc_hdrpull;
 468         drvr->proto->query_dcmd = brcmf_proto_bcdc_query_dcmd;
 469         drvr->proto->set_dcmd = brcmf_proto_bcdc_set_dcmd;
 470         drvr->proto->tx_queue_data = brcmf_proto_bcdc_tx_queue_data;
 471         drvr->proto->txdata = brcmf_proto_bcdc_txdata;
 472         drvr->proto->configure_addr_mode = brcmf_proto_bcdc_configure_addr_mode;
 473         drvr->proto->delete_peer = brcmf_proto_bcdc_delete_peer;
 474         drvr->proto->add_tdls_peer = brcmf_proto_bcdc_add_tdls_peer;
 475         drvr->proto->rxreorder = brcmf_proto_bcdc_rxreorder;
 476         drvr->proto->add_if = brcmf_proto_bcdc_add_if;
 477         drvr->proto->del_if = brcmf_proto_bcdc_del_if;
 478         drvr->proto->reset_if = brcmf_proto_bcdc_reset_if;
 479         drvr->proto->init_done = brcmf_proto_bcdc_init_done;
 480         drvr->proto->debugfs_create = brcmf_proto_bcdc_debugfs_create;
 481         drvr->proto->pd = bcdc;
 482
 483         drvr->hdrlen += BCDC_HEADER_LEN + BRCMF_PROT_FW_SIGNAL_MAX_TXBYTES;
 484         drvr->bus_if->maxctl = BRCMF_DCMD_MAXLEN +
 485                         sizeof(struct brcmf_proto_bcdc_dcmd);
 486         return 0;
 487
 488 fail:
 489         kfree(bcdc);
 490         return -ENOMEM;
 491 }
 492
 493 void brcmf_proto_bcdc_detach_pre_delif(struct brcmf_pub *drvr)
 494 {
 495         struct brcmf_bcdc *bcdc = drvr->proto->pd;
 496
 497         brcmf_fws_detach_pre_delif(bcdc->fws);
 498 }
 499
 500 void brcmf_proto_bcdc_detach_post_delif(struct brcmf_pub *drvr)
 501 {
 502         struct brcmf_bcdc *bcdc = drvr->proto->pd;
 503
 504         drvr->proto->pd = NULL;
 505         brcmf_fws_detach_post_delif(bcdc->fws);
 506         kfree(bcdc);
 507 }