drivers/net/wireless/microchip/wilc1000/wlan.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2012 - 2018 Microchip Technology Inc., and its subsidiaries.
   4  * All rights reserved.
   5  */
   6
   7 #include <linux/if_ether.h>
   8 #include <linux/ip.h>
   9 #include "cfg80211.h"
  10 #include "wlan_cfg.h"
  11
  12 static inline bool is_wilc1000(u32 id)
  13 {
  14         return (id & (~WILC_CHIP_REV_FIELD)) == WILC_1000_BASE_ID;
  15 }
  16
  17 static inline void acquire_bus(struct wilc *wilc, enum bus_acquire acquire)
  18 {
  19         mutex_lock(&wilc->hif_cs);
  20         if (acquire == WILC_BUS_ACQUIRE_AND_WAKEUP)
  21                 chip_wakeup(wilc);
  22 }
  23
  24 static inline void release_bus(struct wilc *wilc, enum bus_release release)
  25 {
  26         if (release == WILC_BUS_RELEASE_ALLOW_SLEEP)
  27                 chip_allow_sleep(wilc);
  28         mutex_unlock(&wilc->hif_cs);
  29 }
  30
  31 static void wilc_wlan_txq_remove(struct wilc *wilc, struct txq_entry_t *tqe)
  32 {
  33         list_del(&tqe->list);
  34         wilc->txq_entries -= 1;
  35 }
  36
  37 static struct txq_entry_t *
  38 wilc_wlan_txq_remove_from_head(struct net_device *dev)
  39 {
  40         struct txq_entry_t *tqe = NULL;
  41         unsigned long flags;
  42         struct wilc_vif *vif = netdev_priv(dev);
  43         struct wilc *wilc = vif->wilc;
  44
  45         spin_lock_irqsave(&wilc->txq_spinlock, flags);
  46
  47         if (!list_empty(&wilc->txq_head.list)) {
  48                 tqe = list_first_entry(&wilc->txq_head.list, struct txq_entry_t,
  49                                        list);
  50                 list_del(&tqe->list);
  51                 wilc->txq_entries -= 1;
  52         }
  53         spin_unlock_irqrestore(&wilc->txq_spinlock, flags);
  54         return tqe;
  55 }
  56
  57 static void wilc_wlan_txq_add_to_tail(struct net_device *dev,
  58                                       struct txq_entry_t *tqe)
  59 {
  60         unsigned long flags;
  61         struct wilc_vif *vif = netdev_priv(dev);
  62         struct wilc *wilc = vif->wilc;
  63
  64         spin_lock_irqsave(&wilc->txq_spinlock, flags);
  65
  66         list_add_tail(&tqe->list, &wilc->txq_head.list);
  67         wilc->txq_entries += 1;
  68
  69         spin_unlock_irqrestore(&wilc->txq_spinlock, flags);
  70
  71         complete(&wilc->txq_event);
  72 }
  73
  74 static void wilc_wlan_txq_add_to_head(struct wilc_vif *vif,
  75                                       struct txq_entry_t *tqe)
  76 {
  77         unsigned long flags;
  78         struct wilc *wilc = vif->wilc;
  79
  80         mutex_lock(&wilc->txq_add_to_head_cs);
  81
  82         spin_lock_irqsave(&wilc->txq_spinlock, flags);
  83
  84         list_add(&tqe->list, &wilc->txq_head.list);
  85         wilc->txq_entries += 1;
  86
  87         spin_unlock_irqrestore(&wilc->txq_spinlock, flags);
  88         mutex_unlock(&wilc->txq_add_to_head_cs);
  89         complete(&wilc->txq_event);
  90 }
  91
  92 #define NOT_TCP_ACK                     (-1)
  93
  94 static inline void add_tcp_session(struct wilc_vif *vif, u32 src_prt,
  95                                    u32 dst_prt, u32 seq)
  96 {
  97         struct tcp_ack_filter *f = &vif->ack_filter;
  98
  99         if (f->tcp_session < 2 * MAX_TCP_SESSION) {
 100                 f->ack_session_info[f->tcp_session].seq_num = seq;
 101                 f->ack_session_info[f->tcp_session].bigger_ack_num = 0;
 102                 f->ack_session_info[f->tcp_session].src_port = src_prt;
 103                 f->ack_session_info[f->tcp_session].dst_port = dst_prt;
 104                 f->tcp_session++;
 105         }
 106 }
 107
 108 static inline void update_tcp_session(struct wilc_vif *vif, u32 index, u32 ack)
 109 {
 110         struct tcp_ack_filter *f = &vif->ack_filter;
 111
 112         if (index < 2 * MAX_TCP_SESSION &&
 113             ack > f->ack_session_info[index].bigger_ack_num)
 114                 f->ack_session_info[index].bigger_ack_num = ack;
 115 }
 116
 117 static inline void add_tcp_pending_ack(struct wilc_vif *vif, u32 ack,
 118                                        u32 session_index,
 119                                        struct txq_entry_t *txqe)
 120 {
 121         struct tcp_ack_filter *f = &vif->ack_filter;
 122         u32 i = f->pending_base + f->pending_acks_idx;
 123
 124         if (i < MAX_PENDING_ACKS) {
 125                 f->pending_acks[i].ack_num = ack;
 126                 f->pending_acks[i].txqe = txqe;
 127                 f->pending_acks[i].session_index = session_index;
 128                 txqe->ack_idx = i;
 129                 f->pending_acks_idx++;
 130         }
 131 }
 132
 133 static inline void tcp_process(struct net_device *dev, struct txq_entry_t *tqe)
 134 {
 135         void *buffer = tqe->buffer;
 136         const struct ethhdr *eth_hdr_ptr = buffer;
 137         int i;
 138         unsigned long flags;
 139         struct wilc_vif *vif = netdev_priv(dev);
 140         struct wilc *wilc = vif->wilc;
 141         struct tcp_ack_filter *f = &vif->ack_filter;
 142         const struct iphdr *ip_hdr_ptr;
 143         const struct tcphdr *tcp_hdr_ptr;
 144         u32 ihl, total_length, data_offset;
 145
 146         spin_lock_irqsave(&wilc->txq_spinlock, flags);
 147
 148         if (eth_hdr_ptr->h_proto != htons(ETH_P_IP))
 149                 goto out;
 150
 151         ip_hdr_ptr = buffer + ETH_HLEN;
 152
 153         if (ip_hdr_ptr->protocol != IPPROTO_TCP)
 154                 goto out;
 155
 156         ihl = ip_hdr_ptr->ihl << 2;
 157         tcp_hdr_ptr = buffer + ETH_HLEN + ihl;
 158         total_length = ntohs(ip_hdr_ptr->tot_len);
 159
 160         data_offset = tcp_hdr_ptr->doff << 2;
 161         if (total_length == (ihl + data_offset)) {
 162                 u32 seq_no, ack_no;
 163
 164                 seq_no = ntohl(tcp_hdr_ptr->seq);
 165                 ack_no = ntohl(tcp_hdr_ptr->ack_seq);
 166                 for (i = 0; i < f->tcp_session; i++) {
 167                         u32 j = f->ack_session_info[i].seq_num;
 168
 169                         if (i < 2 * MAX_TCP_SESSION &&
 170                             j == seq_no) {
 171                                 update_tcp_session(vif, i, ack_no);
 172                                 break;
 173                         }
 174                 }
 175                 if (i == f->tcp_session)
 176                         add_tcp_session(vif, 0, 0, seq_no);
 177
 178                 add_tcp_pending_ack(vif, ack_no, i, tqe);
 179         }
 180
 181 out:
 182         spin_unlock_irqrestore(&wilc->txq_spinlock, flags);
 183 }
 184
 185 static void wilc_wlan_txq_filter_dup_tcp_ack(struct net_device *dev)
 186 {
 187         struct wilc_vif *vif = netdev_priv(dev);
 188         struct wilc *wilc = vif->wilc;
 189         struct tcp_ack_filter *f = &vif->ack_filter;
 190         u32 i = 0;
 191         u32 dropped = 0;
 192         unsigned long flags;
 193
 194         spin_lock_irqsave(&wilc->txq_spinlock, flags);
 195         for (i = f->pending_base;
 196              i < (f->pending_base + f->pending_acks_idx); i++) {
 197                 u32 index;
 198                 u32 bigger_ack_num;
 199
 200                 if (i >= MAX_PENDING_ACKS)
 201                         break;
 202
 203                 index = f->pending_acks[i].session_index;
 204
 205                 if (index >= 2 * MAX_TCP_SESSION)
 206                         break;
 207
 208                 bigger_ack_num = f->ack_session_info[index].bigger_ack_num;
 209
 210                 if (f->pending_acks[i].ack_num < bigger_ack_num) {
 211                         struct txq_entry_t *tqe;
 212
 213                         tqe = f->pending_acks[i].txqe;
 214                         if (tqe) {
 215                                 wilc_wlan_txq_remove(wilc, tqe);
 216                                 tqe->status = 1;
 217                                 if (tqe->tx_complete_func)
 218                                         tqe->tx_complete_func(tqe->priv,
 219                                                               tqe->status);
 220                                 kfree(tqe);
 221                                 dropped++;
 222                         }
 223                 }
 224         }
 225         f->pending_acks_idx = 0;
 226         f->tcp_session = 0;
 227
 228         if (f->pending_base == 0)
 229                 f->pending_base = MAX_TCP_SESSION;
 230         else
 231                 f->pending_base = 0;
 232
 233         spin_unlock_irqrestore(&wilc->txq_spinlock, flags);
 234
 235         while (dropped > 0) {
 236                 wait_for_completion_timeout(&wilc->txq_event,
 237                                             msecs_to_jiffies(1));
 238                 dropped--;
 239         }
 240 }
 241
 242 void wilc_enable_tcp_ack_filter(struct wilc_vif *vif, bool value)
 243 {
 244         vif->ack_filter.enabled = value;
 245 }
 246
 247 static int wilc_wlan_txq_add_cfg_pkt(struct wilc_vif *vif, u8 *buffer,
 248                                      u32 buffer_size)
 249 {
 250         struct txq_entry_t *tqe;
 251         struct wilc *wilc = vif->wilc;
 252
 253         netdev_dbg(vif->ndev, "Adding config packet ...\n");
 254         if (wilc->quit) {
 255                 netdev_dbg(vif->ndev, "Return due to clear function\n");
 256                 complete(&wilc->cfg_event);
 257                 return 0;
 258         }
 259
 260         tqe = kmalloc(sizeof(*tqe), GFP_ATOMIC);
 261         if (!tqe)
 262                 return 0;
 263
 264         tqe->type = WILC_CFG_PKT;
 265         tqe->buffer = buffer;
 266         tqe->buffer_size = buffer_size;
 267         tqe->tx_complete_func = NULL;
 268         tqe->priv = NULL;
 269         tqe->ack_idx = NOT_TCP_ACK;
 270         tqe->vif = vif;
 271
 272         wilc_wlan_txq_add_to_head(vif, tqe);
 273
 274         return 1;
 275 }
 276
 277 int wilc_wlan_txq_add_net_pkt(struct net_device *dev, void *priv, u8 *buffer,
 278                               u32 buffer_size,
 279                               void (*tx_complete_fn)(void *, int))
 280 {
 281         struct txq_entry_t *tqe;
 282         struct wilc_vif *vif = netdev_priv(dev);
 283         struct wilc *wilc;
 284
 285         wilc = vif->wilc;
 286
 287         if (wilc->quit)
 288                 return 0;
 289
 290         tqe = kmalloc(sizeof(*tqe), GFP_ATOMIC);
 291
 292         if (!tqe)
 293                 return 0;
 294         tqe->type = WILC_NET_PKT;
 295         tqe->buffer = buffer;
 296         tqe->buffer_size = buffer_size;
 297         tqe->tx_complete_func = tx_complete_fn;
 298         tqe->priv = priv;
 299         tqe->vif = vif;
 300
 301         tqe->ack_idx = NOT_TCP_ACK;
 302         if (vif->ack_filter.enabled)
 303                 tcp_process(dev, tqe);
 304         wilc_wlan_txq_add_to_tail(dev, tqe);
 305         return wilc->txq_entries;
 306 }
 307
 308 int wilc_wlan_txq_add_mgmt_pkt(struct net_device *dev, void *priv, u8 *buffer,
 309                                u32 buffer_size,
 310                                void (*tx_complete_fn)(void *, int))
 311 {
 312         struct txq_entry_t *tqe;
 313         struct wilc_vif *vif = netdev_priv(dev);
 314         struct wilc *wilc;
 315
 316         wilc = vif->wilc;
 317
 318         if (wilc->quit)
 319                 return 0;
 320
 321         tqe = kmalloc(sizeof(*tqe), GFP_ATOMIC);
 322
 323         if (!tqe)
 324                 return 0;
 325         tqe->type = WILC_MGMT_PKT;
 326         tqe->buffer = buffer;
 327         tqe->buffer_size = buffer_size;
 328         tqe->tx_complete_func = tx_complete_fn;
 329         tqe->priv = priv;
 330         tqe->ack_idx = NOT_TCP_ACK;
 331         tqe->vif = vif;
 332         wilc_wlan_txq_add_to_tail(dev, tqe);
 333         return 1;
 334 }
 335
 336 static struct txq_entry_t *wilc_wlan_txq_get_first(struct wilc *wilc)
 337 {
 338         struct txq_entry_t *tqe = NULL;
 339         unsigned long flags;
 340
 341         spin_lock_irqsave(&wilc->txq_spinlock, flags);
 342
 343         if (!list_empty(&wilc->txq_head.list))
 344                 tqe = list_first_entry(&wilc->txq_head.list, struct txq_entry_t,
 345                                        list);
 346
 347         spin_unlock_irqrestore(&wilc->txq_spinlock, flags);
 348
 349         return tqe;
 350 }
 351
 352 static struct txq_entry_t *wilc_wlan_txq_get_next(struct wilc *wilc,
 353                                                   struct txq_entry_t *tqe)
 354 {
 355         unsigned long flags;
 356
 357         spin_lock_irqsave(&wilc->txq_spinlock, flags);
 358
 359         if (!list_is_last(&tqe->list, &wilc->txq_head.list))
 360                 tqe = list_next_entry(tqe, list);
 361         else
 362                 tqe = NULL;
 363         spin_unlock_irqrestore(&wilc->txq_spinlock, flags);
 364
 365         return tqe;
 366 }
 367
 368 static void wilc_wlan_rxq_add(struct wilc *wilc, struct rxq_entry_t *rqe)
 369 {
 370         if (wilc->quit)
 371                 return;
 372
 373         mutex_lock(&wilc->rxq_cs);
 374         list_add_tail(&rqe->list, &wilc->rxq_head.list);
 375         mutex_unlock(&wilc->rxq_cs);
 376 }
 377
 378 static struct rxq_entry_t *wilc_wlan_rxq_remove(struct wilc *wilc)
 379 {
 380         struct rxq_entry_t *rqe = NULL;
 381
 382         mutex_lock(&wilc->rxq_cs);
 383         if (!list_empty(&wilc->rxq_head.list)) {
 384                 rqe = list_first_entry(&wilc->rxq_head.list, struct rxq_entry_t,
 385                                        list);
 386                 list_del(&rqe->list);
 387         }
 388         mutex_unlock(&wilc->rxq_cs);
 389         return rqe;
 390 }
 391
 392 void chip_allow_sleep(struct wilc *wilc)
 393 {
 394         u32 reg = 0;
 395
 396         wilc->hif_func->hif_read_reg(wilc, WILC_SDIO_WAKEUP_REG, &reg);
 397
 398         wilc->hif_func->hif_write_reg(wilc, WILC_SDIO_WAKEUP_REG,
 399                                       reg & ~WILC_SDIO_WAKEUP_BIT);
 400         wilc->hif_func->hif_write_reg(wilc, WILC_SDIO_HOST_TO_FW_REG, 0);
 401 }
 402 EXPORT_SYMBOL_GPL(chip_allow_sleep);
 403
 404 void chip_wakeup(struct wilc *wilc)
 405 {
 406         u32 reg, clk_status_reg;
 407         const struct wilc_hif_func *h = wilc->hif_func;
 408
 409         if (wilc->io_type == WILC_HIF_SPI) {
 410                 do {
 411                         h->hif_read_reg(wilc, WILC_SPI_WAKEUP_REG, &reg);
 412                         h->hif_write_reg(wilc, WILC_SPI_WAKEUP_REG,
 413                                          reg | WILC_SPI_WAKEUP_BIT);
 414                         h->hif_write_reg(wilc, WILC_SPI_WAKEUP_REG,
 415                                          reg & ~WILC_SPI_WAKEUP_BIT);
 416
 417                         do {
 418                                 usleep_range(2000, 2500);
 419                                 wilc_get_chipid(wilc, true);
 420                         } while (wilc_get_chipid(wilc, true) == 0);
 421                 } while (wilc_get_chipid(wilc, true) == 0);
 422         } else if (wilc->io_type == WILC_HIF_SDIO) {
 423                 h->hif_write_reg(wilc, WILC_SDIO_HOST_TO_FW_REG,
 424                                  WILC_SDIO_HOST_TO_FW_BIT);
 425                 usleep_range(200, 400);
 426                 h->hif_read_reg(wilc, WILC_SDIO_WAKEUP_REG, &reg);
 427                 do {
 428                         h->hif_write_reg(wilc, WILC_SDIO_WAKEUP_REG,
 429                                          reg | WILC_SDIO_WAKEUP_BIT);
 430                         h->hif_read_reg(wilc, WILC_SDIO_CLK_STATUS_REG,
 431                                         &clk_status_reg);
 432
 433                         while (!(clk_status_reg & WILC_SDIO_CLK_STATUS_BIT)) {
 434                                 usleep_range(2000, 2500);
 435
 436                                 h->hif_read_reg(wilc, WILC_SDIO_CLK_STATUS_REG,
 437                                                 &clk_status_reg);
 438                         }
 439                         if (!(clk_status_reg & WILC_SDIO_CLK_STATUS_BIT)) {
 440                                 h->hif_write_reg(wilc, WILC_SDIO_WAKEUP_REG,
 441                                                  reg & ~WILC_SDIO_WAKEUP_BIT);
 442                         }
 443                 } while (!(clk_status_reg & WILC_SDIO_CLK_STATUS_BIT));
 444         }
 445
 446         if (wilc->chip_ps_state == WILC_CHIP_SLEEPING_MANUAL) {
 447                 if (wilc_get_chipid(wilc, false) < WILC_1000_BASE_ID_2B) {
 448                         u32 val32;
 449
 450                         h->hif_read_reg(wilc, WILC_REG_4_TO_1_RX, &val32);
 451                         val32 |= BIT(6);
 452                         h->hif_write_reg(wilc, WILC_REG_4_TO_1_RX, val32);
 453
 454                         h->hif_read_reg(wilc, WILC_REG_4_TO_1_TX_BANK0, &val32);
 455                         val32 |= BIT(6);
 456                         h->hif_write_reg(wilc, WILC_REG_4_TO_1_TX_BANK0, val32);
 457                 }
 458         }
 459         wilc->chip_ps_state = WILC_CHIP_WAKEDUP;
 460 }
 461 EXPORT_SYMBOL_GPL(chip_wakeup);
 462
 463 void host_wakeup_notify(struct wilc *wilc)
 464 {
 465         acquire_bus(wilc, WILC_BUS_ACQUIRE_ONLY);
 466         wilc->hif_func->hif_write_reg(wilc, WILC_CORTUS_INTERRUPT_2, 1);
 467         release_bus(wilc, WILC_BUS_RELEASE_ONLY);
 468 }
 469 EXPORT_SYMBOL_GPL(host_wakeup_notify);
 470
 471 void host_sleep_notify(struct wilc *wilc)
 472 {
 473         acquire_bus(wilc, WILC_BUS_ACQUIRE_ONLY);
 474         wilc->hif_func->hif_write_reg(wilc, WILC_CORTUS_INTERRUPT_1, 1);
 475         release_bus(wilc, WILC_BUS_RELEASE_ONLY);
 476 }
 477 EXPORT_SYMBOL_GPL(host_sleep_notify);
 478
 479 int wilc_wlan_handle_txq(struct wilc *wilc, u32 *txq_count)
 480 {
 481         int i, entries = 0;
 482         u32 sum;
 483         u32 reg;
 484         u32 offset = 0;
 485         int vmm_sz = 0;
 486         struct txq_entry_t *tqe;
 487         int ret = 0;
 488         int counter;
 489         int timeout;
 490         u32 vmm_table[WILC_VMM_TBL_SIZE];
 491         const struct wilc_hif_func *func;
 492         u8 *txb = wilc->tx_buffer;
 493         struct net_device *dev;
 494         struct wilc_vif *vif;
 495
 496         if (wilc->quit)
 497                 goto out_update_cnt;
 498
 499         mutex_lock(&wilc->txq_add_to_head_cs);
 500         tqe = wilc_wlan_txq_get_first(wilc);
 501         if (!tqe)
 502                 goto out_unlock;
 503         dev = tqe->vif->ndev;
 504         wilc_wlan_txq_filter_dup_tcp_ack(dev);
 505         i = 0;
 506         sum = 0;
 507         while (tqe && (i < (WILC_VMM_TBL_SIZE - 1))) {
 508                 if (tqe->type == WILC_CFG_PKT)
 509                         vmm_sz = ETH_CONFIG_PKT_HDR_OFFSET;
 510                 else if (tqe->type == WILC_NET_PKT)
 511                         vmm_sz = ETH_ETHERNET_HDR_OFFSET;
 512                 else
 513                         vmm_sz = HOST_HDR_OFFSET;
 514
 515                 vmm_sz += tqe->buffer_size;
 516                 vmm_sz = ALIGN(vmm_sz, 4);
 517
 518                 if ((sum + vmm_sz) > WILC_TX_BUFF_SIZE)
 519                         break;
 520
 521                 vmm_table[i] = vmm_sz / 4;
 522                 if (tqe->type == WILC_CFG_PKT)
 523                         vmm_table[i] |= BIT(10);
 524                 cpu_to_le32s(&vmm_table[i]);
 525
 526                 i++;
 527                 sum += vmm_sz;
 528                 tqe = wilc_wlan_txq_get_next(wilc, tqe);
 529         }
 530
 531         if (i == 0)
 532                 goto out_unlock;
 533         vmm_table[i] = 0x0;
 534
 535         acquire_bus(wilc, WILC_BUS_ACQUIRE_AND_WAKEUP);
 536         counter = 0;
 537         func = wilc->hif_func;
 538         do {
 539                 ret = func->hif_read_reg(wilc, WILC_HOST_TX_CTRL, &reg);
 540                 if (ret)
 541                         break;
 542
 543                 if ((reg & 0x1) == 0)
 544                         break;
 545
 546                 counter++;
 547                 if (counter > 200) {
 548                         counter = 0;
 549                         ret = func->hif_write_reg(wilc, WILC_HOST_TX_CTRL, 0);
 550                         break;
 551                 }
 552         } while (!wilc->quit);
 553
 554         if (ret)
 555                 goto out_release_bus;
 556
 557         timeout = 200;
 558         do {
 559                 ret = func->hif_block_tx(wilc,
 560                                          WILC_VMM_TBL_RX_SHADOW_BASE,
 561                                          (u8 *)vmm_table,
 562                                          ((i + 1) * 4));
 563                 if (ret)
 564                         break;
 565
 566                 ret = func->hif_write_reg(wilc, WILC_HOST_VMM_CTL, 0x2);
 567                 if (ret)
 568                         break;
 569
 570                 do {
 571                         ret = func->hif_read_reg(wilc, WILC_HOST_VMM_CTL, &reg);
 572                         if (ret)
 573                                 break;
 574                         if (FIELD_GET(WILC_VMM_ENTRY_AVAILABLE, reg)) {
 575                                 entries = FIELD_GET(WILC_VMM_ENTRY_COUNT, reg);
 576                                 break;
 577                         }
 578                 } while (--timeout);
 579                 if (timeout <= 0) {
 580                         ret = func->hif_write_reg(wilc, WILC_HOST_VMM_CTL, 0x0);
 581                         break;
 582                 }
 583
 584                 if (ret)
 585                         break;
 586
 587                 if (entries == 0) {
 588                         ret = func->hif_read_reg(wilc, WILC_HOST_TX_CTRL, &reg);
 589                         if (ret)
 590                                 break;
 591                         reg &= ~BIT(0);
 592                         ret = func->hif_write_reg(wilc, WILC_HOST_TX_CTRL, reg);
 593                 }
 594         } while (0);
 595
 596         if (ret)
 597                 goto out_release_bus;
 598
 599         if (entries == 0) {
 600                 /*
 601                  * No VMM space available in firmware so retry to transmit
 602                  * the packet from tx queue.
 603                  */
 604                 ret = WILC_VMM_ENTRY_FULL_RETRY;
 605                 goto out_release_bus;
 606         }
 607
 608         release_bus(wilc, WILC_BUS_RELEASE_ALLOW_SLEEP);
 609
 610         offset = 0;
 611         i = 0;
 612         do {
 613                 u32 header, buffer_offset;
 614                 char *bssid;
 615                 u8 mgmt_ptk = 0;
 616
 617                 tqe = wilc_wlan_txq_remove_from_head(dev);
 618                 if (!tqe)
 619                         break;
 620
 621                 vif = tqe->vif;
 622                 if (vmm_table[i] == 0)
 623                         break;
 624
 625                 le32_to_cpus(&vmm_table[i]);
 626                 vmm_sz = FIELD_GET(WILC_VMM_BUFFER_SIZE, vmm_table[i]);
 627                 vmm_sz *= 4;
 628
 629                 if (tqe->type == WILC_MGMT_PKT)
 630                         mgmt_ptk = 1;
 631
 632                 header = (FIELD_PREP(WILC_VMM_HDR_TYPE, tqe->type) |
 633                           FIELD_PREP(WILC_VMM_HDR_MGMT_FIELD, mgmt_ptk) |
 634                           FIELD_PREP(WILC_VMM_HDR_PKT_SIZE, tqe->buffer_size) |
 635                           FIELD_PREP(WILC_VMM_HDR_BUFF_SIZE, vmm_sz));
 636
 637                 cpu_to_le32s(&header);
 638                 memcpy(&txb[offset], &header, 4);
 639                 if (tqe->type == WILC_CFG_PKT) {
 640                         buffer_offset = ETH_CONFIG_PKT_HDR_OFFSET;
 641                 } else if (tqe->type == WILC_NET_PKT) {
 642                         bssid = tqe->vif->bssid;
 643                         buffer_offset = ETH_ETHERNET_HDR_OFFSET;
 644                         memcpy(&txb[offset + 8], bssid, 6);
 645                 } else {
 646                         buffer_offset = HOST_HDR_OFFSET;
 647                 }
 648
 649                 memcpy(&txb[offset + buffer_offset],
 650                        tqe->buffer, tqe->buffer_size);
 651                 offset += vmm_sz;
 652                 i++;
 653                 tqe->status = 1;
 654                 if (tqe->tx_complete_func)
 655                         tqe->tx_complete_func(tqe->priv, tqe->status);
 656                 if (tqe->ack_idx != NOT_TCP_ACK &&
 657                     tqe->ack_idx < MAX_PENDING_ACKS)
 658                         vif->ack_filter.pending_acks[tqe->ack_idx].txqe = NULL;
 659                 kfree(tqe);
 660         } while (--entries);
 661
 662         acquire_bus(wilc, WILC_BUS_ACQUIRE_AND_WAKEUP);
 663
 664         ret = func->hif_clear_int_ext(wilc, ENABLE_TX_VMM);
 665         if (ret)
 666                 goto out_release_bus;
 667
 668         ret = func->hif_block_tx_ext(wilc, 0, txb, offset);
 669
 670 out_release_bus:
 671         release_bus(wilc, WILC_BUS_RELEASE_ALLOW_SLEEP);
 672
 673 out_unlock:
 674         mutex_unlock(&wilc->txq_add_to_head_cs);
 675
 676 out_update_cnt:
 677         *txq_count = wilc->txq_entries;
 678         return ret;
 679 }
 680
 681 static void wilc_wlan_handle_rx_buff(struct wilc *wilc, u8 *buffer, int size)
 682 {
 683         int offset = 0;
 684         u32 header;
 685         u32 pkt_len, pkt_offset, tp_len;
 686         int is_cfg_packet;
 687         u8 *buff_ptr;
 688
 689         do {
 690                 buff_ptr = buffer + offset;
 691                 header = get_unaligned_le32(buff_ptr);
 692
 693                 is_cfg_packet = FIELD_GET(WILC_PKT_HDR_CONFIG_FIELD, header);
 694                 pkt_offset = FIELD_GET(WILC_PKT_HDR_OFFSET_FIELD, header);
 695                 tp_len = FIELD_GET(WILC_PKT_HDR_TOTAL_LEN_FIELD, header);
 696                 pkt_len = FIELD_GET(WILC_PKT_HDR_LEN_FIELD, header);
 697
 698                 if (pkt_len == 0 || tp_len == 0)
 699                         break;
 700
 701                 if (pkt_offset & IS_MANAGMEMENT) {
 702                         buff_ptr += HOST_HDR_OFFSET;
 703                         wilc_wfi_mgmt_rx(wilc, buff_ptr, pkt_len);
 704                 } else {
 705                         if (!is_cfg_packet) {
 706                                 wilc_frmw_to_host(wilc, buff_ptr, pkt_len,
 707                                                   pkt_offset);
 708                         } else {
 709                                 struct wilc_cfg_rsp rsp;
 710
 711                                 buff_ptr += pkt_offset;
 712
 713                                 wilc_wlan_cfg_indicate_rx(wilc, buff_ptr,
 714                                                           pkt_len,
 715                                                           &rsp);
 716                                 if (rsp.type == WILC_CFG_RSP) {
 717                                         if (wilc->cfg_seq_no == rsp.seq_no)
 718                                                 complete(&wilc->cfg_event);
 719                                 } else if (rsp.type == WILC_CFG_RSP_STATUS) {
 720                                         wilc_mac_indicate(wilc);
 721                                 }
 722                         }
 723                 }
 724                 offset += tp_len;
 725         } while (offset < size);
 726 }
 727
 728 static void wilc_wlan_handle_rxq(struct wilc *wilc)
 729 {
 730         int size;
 731         u8 *buffer;
 732         struct rxq_entry_t *rqe;
 733
 734         while (!wilc->quit) {
 735                 rqe = wilc_wlan_rxq_remove(wilc);
 736                 if (!rqe)
 737                         break;
 738
 739                 buffer = rqe->buffer;
 740                 size = rqe->buffer_size;
 741                 wilc_wlan_handle_rx_buff(wilc, buffer, size);
 742
 743                 kfree(rqe);
 744         }
 745         if (wilc->quit)
 746                 complete(&wilc->cfg_event);
 747 }
 748
 749 static void wilc_unknown_isr_ext(struct wilc *wilc)
 750 {
 751         wilc->hif_func->hif_clear_int_ext(wilc, 0);
 752 }
 753
 754 static void wilc_wlan_handle_isr_ext(struct wilc *wilc, u32 int_status)
 755 {
 756         u32 offset = wilc->rx_buffer_offset;
 757         u8 *buffer = NULL;
 758         u32 size;
 759         u32 retries = 0;
 760         int ret = 0;
 761         struct rxq_entry_t *rqe;
 762
 763         size = FIELD_GET(WILC_INTERRUPT_DATA_SIZE, int_status) << 2;
 764
 765         while (!size && retries < 10) {
 766                 wilc->hif_func->hif_read_size(wilc, &size);
 767                 size = FIELD_GET(WILC_INTERRUPT_DATA_SIZE, size) << 2;
 768                 retries++;
 769         }
 770
 771         if (size <= 0)
 772                 return;
 773
 774         if (WILC_RX_BUFF_SIZE - offset < size)
 775                 offset = 0;
 776
 777         buffer = &wilc->rx_buffer[offset];
 778
 779         wilc->hif_func->hif_clear_int_ext(wilc, DATA_INT_CLR | ENABLE_RX_VMM);
 780         ret = wilc->hif_func->hif_block_rx_ext(wilc, 0, buffer, size);
 781         if (ret)
 782                 return;
 783
 784         offset += size;
 785         wilc->rx_buffer_offset = offset;
 786         rqe = kmalloc(sizeof(*rqe), GFP_KERNEL);
 787         if (!rqe)
 788                 return;
 789
 790         rqe->buffer = buffer;
 791         rqe->buffer_size = size;
 792         wilc_wlan_rxq_add(wilc, rqe);
 793         wilc_wlan_handle_rxq(wilc);
 794 }
 795
 796 void wilc_handle_isr(struct wilc *wilc)
 797 {
 798         u32 int_status;
 799
 800         acquire_bus(wilc, WILC_BUS_ACQUIRE_AND_WAKEUP);
 801         wilc->hif_func->hif_read_int(wilc, &int_status);
 802
 803         if (int_status & DATA_INT_EXT)
 804                 wilc_wlan_handle_isr_ext(wilc, int_status);
 805
 806         if (!(int_status & (ALL_INT_EXT)))
 807                 wilc_unknown_isr_ext(wilc);
 808
 809         release_bus(wilc, WILC_BUS_RELEASE_ALLOW_SLEEP);
 810 }
 811 EXPORT_SYMBOL_GPL(wilc_handle_isr);
 812
 813 int wilc_wlan_firmware_download(struct wilc *wilc, const u8 *buffer,
 814                                 u32 buffer_size)
 815 {
 816         u32 offset;
 817         u32 addr, size, size2, blksz;
 818         u8 *dma_buffer;
 819         int ret = 0;
 820
 821         blksz = BIT(12);
 822
 823         dma_buffer = kmalloc(blksz, GFP_KERNEL);
 824         if (!dma_buffer)
 825                 return -EIO;
 826
 827         offset = 0;
 828         do {
 829                 addr = get_unaligned_le32(&buffer[offset]);
 830                 size = get_unaligned_le32(&buffer[offset + 4]);
 831                 acquire_bus(wilc, WILC_BUS_ACQUIRE_ONLY);
 832                 offset += 8;
 833                 while (((int)size) && (offset < buffer_size)) {
 834                         if (size <= blksz)
 835                                 size2 = size;
 836                         else
 837                                 size2 = blksz;
 838
 839                         memcpy(dma_buffer, &buffer[offset], size2);
 840                         ret = wilc->hif_func->hif_block_tx(wilc, addr,
 841                                                            dma_buffer, size2);
 842                         if (ret)
 843                                 break;
 844
 845                         addr += size2;
 846                         offset += size2;
 847                         size -= size2;
 848                 }
 849                 release_bus(wilc, WILC_BUS_RELEASE_ONLY);
 850
 851                 if (ret)
 852                         goto fail;
 853         } while (offset < buffer_size);
 854
 855 fail:
 856
 857         kfree(dma_buffer);
 858
 859         return ret;
 860 }
 861
 862 int wilc_wlan_start(struct wilc *wilc)
 863 {
 864         u32 reg = 0;
 865         int ret;
 866         u32 chipid;
 867
 868         if (wilc->io_type == WILC_HIF_SDIO) {
 869                 reg = 0;
 870                 reg |= BIT(3);
 871         } else if (wilc->io_type == WILC_HIF_SPI) {
 872                 reg = 1;
 873         }
 874         acquire_bus(wilc, WILC_BUS_ACQUIRE_ONLY);
 875         ret = wilc->hif_func->hif_write_reg(wilc, WILC_VMM_CORE_CFG, reg);
 876         if (ret) {
 877                 release_bus(wilc, WILC_BUS_RELEASE_ONLY);
 878                 return ret;
 879         }
 880         reg = 0;
 881         if (wilc->io_type == WILC_HIF_SDIO && wilc->dev_irq_num)
 882                 reg |= WILC_HAVE_SDIO_IRQ_GPIO;
 883
 884         ret = wilc->hif_func->hif_write_reg(wilc, WILC_GP_REG_1, reg);
 885         if (ret) {
 886                 release_bus(wilc, WILC_BUS_RELEASE_ONLY);
 887                 return ret;
 888         }
 889
 890         wilc->hif_func->hif_sync_ext(wilc, NUM_INT_EXT);
 891
 892         ret = wilc->hif_func->hif_read_reg(wilc, WILC_CHIPID, &chipid);
 893         if (ret) {
 894                 release_bus(wilc, WILC_BUS_RELEASE_ONLY);
 895                 return ret;
 896         }
 897
 898         wilc->hif_func->hif_read_reg(wilc, WILC_GLB_RESET_0, &reg);
 899         if ((reg & BIT(10)) == BIT(10)) {
 900                 reg &= ~BIT(10);
 901                 wilc->hif_func->hif_write_reg(wilc, WILC_GLB_RESET_0, reg);
 902                 wilc->hif_func->hif_read_reg(wilc, WILC_GLB_RESET_0, &reg);
 903         }
 904
 905         reg |= BIT(10);
 906         ret = wilc->hif_func->hif_write_reg(wilc, WILC_GLB_RESET_0, reg);
 907         wilc->hif_func->hif_read_reg(wilc, WILC_GLB_RESET_0, &reg);
 908         release_bus(wilc, WILC_BUS_RELEASE_ONLY);
 909
 910         return ret;
 911 }
 912
 913 int wilc_wlan_stop(struct wilc *wilc, struct wilc_vif *vif)
 914 {
 915         u32 reg = 0;
 916         int ret;
 917
 918         acquire_bus(wilc, WILC_BUS_ACQUIRE_AND_WAKEUP);
 919
 920         ret = wilc->hif_func->hif_read_reg(wilc, WILC_GP_REG_0, &reg);
 921         if (ret) {
 922                 netdev_err(vif->ndev, "Error while reading reg\n");
 923                 release_bus(wilc, WILC_BUS_RELEASE_ALLOW_SLEEP);
 924                 return ret;
 925         }
 926
 927         ret = wilc->hif_func->hif_write_reg(wilc, WILC_GP_REG_0,
 928                                         (reg | WILC_ABORT_REQ_BIT));
 929         if (ret) {
 930                 netdev_err(vif->ndev, "Error while writing reg\n");
 931                 release_bus(wilc, WILC_BUS_RELEASE_ALLOW_SLEEP);
 932                 return ret;
 933         }
 934
 935         ret = wilc->hif_func->hif_read_reg(wilc, WILC_FW_HOST_COMM, &reg);
 936         if (ret) {
 937                 netdev_err(vif->ndev, "Error while reading reg\n");
 938                 release_bus(wilc, WILC_BUS_RELEASE_ALLOW_SLEEP);
 939                 return ret;
 940         }
 941         reg = BIT(0);
 942
 943         ret = wilc->hif_func->hif_write_reg(wilc, WILC_FW_HOST_COMM, reg);
 944         if (ret) {
 945                 netdev_err(vif->ndev, "Error while writing reg\n");
 946                 release_bus(wilc, WILC_BUS_RELEASE_ALLOW_SLEEP);
 947                 return ret;
 948         }
 949
 950         release_bus(wilc, WILC_BUS_RELEASE_ALLOW_SLEEP);
 951
 952         return 0;
 953 }
 954
 955 void wilc_wlan_cleanup(struct net_device *dev)
 956 {
 957         struct txq_entry_t *tqe;
 958         struct rxq_entry_t *rqe;
 959         struct wilc_vif *vif = netdev_priv(dev);
 960         struct wilc *wilc = vif->wilc;
 961
 962         wilc->quit = 1;
 963         while ((tqe = wilc_wlan_txq_remove_from_head(dev))) {
 964                 if (tqe->tx_complete_func)
 965                         tqe->tx_complete_func(tqe->priv, 0);
 966                 kfree(tqe);
 967         }
 968
 969         while ((rqe = wilc_wlan_rxq_remove(wilc)))
 970                 kfree(rqe);
 971
 972         kfree(wilc->rx_buffer);
 973         wilc->rx_buffer = NULL;
 974         kfree(wilc->tx_buffer);
 975         wilc->tx_buffer = NULL;
 976         wilc->hif_func->hif_deinit(NULL);
 977 }
 978
 979 static int wilc_wlan_cfg_commit(struct wilc_vif *vif, int type,
 980                                 u32 drv_handler)
 981 {
 982         struct wilc *wilc = vif->wilc;
 983         struct wilc_cfg_frame *cfg = &wilc->cfg_frame;
 984         int t_len = wilc->cfg_frame_offset + sizeof(struct wilc_cfg_cmd_hdr);
 985
 986         if (type == WILC_CFG_SET)
 987                 cfg->hdr.cmd_type = 'W';
 988         else
 989                 cfg->hdr.cmd_type = 'Q';
 990
 991         cfg->hdr.seq_no = wilc->cfg_seq_no % 256;
 992         cfg->hdr.total_len = cpu_to_le16(t_len);
 993         cfg->hdr.driver_handler = cpu_to_le32(drv_handler);
 994         wilc->cfg_seq_no = cfg->hdr.seq_no;
 995
 996         if (!wilc_wlan_txq_add_cfg_pkt(vif, (u8 *)&cfg->hdr, t_len))
 997                 return -1;
 998
 999         return 0;
1000 }
1001
1002 int wilc_wlan_cfg_set(struct wilc_vif *vif, int start, u16 wid, u8 *buffer,
1003                       u32 buffer_size, int commit, u32 drv_handler)
1004 {
1005         u32 offset;
1006         int ret_size;
1007         struct wilc *wilc = vif->wilc;
1008
1009         mutex_lock(&wilc->cfg_cmd_lock);
1010
1011         if (start)
1012                 wilc->cfg_frame_offset = 0;
1013
1014         offset = wilc->cfg_frame_offset;
1015         ret_size = wilc_wlan_cfg_set_wid(wilc->cfg_frame.frame, offset,
1016                                          wid, buffer, buffer_size);
1017         offset += ret_size;
1018         wilc->cfg_frame_offset = offset;
1019
1020         if (!commit) {
1021                 mutex_unlock(&wilc->cfg_cmd_lock);
1022                 return ret_size;
1023         }
1024
1025         netdev_dbg(vif->ndev, "%s: seqno[%d]\n", __func__, wilc->cfg_seq_no);
1026
1027         if (wilc_wlan_cfg_commit(vif, WILC_CFG_SET, drv_handler))
1028                 ret_size = 0;
1029
1030         if (!wait_for_completion_timeout(&wilc->cfg_event,
1031                                          WILC_CFG_PKTS_TIMEOUT)) {
1032                 netdev_dbg(vif->ndev, "%s: Timed Out\n", __func__);
1033                 ret_size = 0;
1034         }
1035
1036         wilc->cfg_frame_offset = 0;
1037         wilc->cfg_seq_no += 1;
1038         mutex_unlock(&wilc->cfg_cmd_lock);
1039
1040         return ret_size;
1041 }
1042
1043 int wilc_wlan_cfg_get(struct wilc_vif *vif, int start, u16 wid, int commit,
1044                       u32 drv_handler)
1045 {
1046         u32 offset;
1047         int ret_size;
1048         struct wilc *wilc = vif->wilc;
1049
1050         mutex_lock(&wilc->cfg_cmd_lock);
1051
1052         if (start)
1053                 wilc->cfg_frame_offset = 0;
1054
1055         offset = wilc->cfg_frame_offset;
1056         ret_size = wilc_wlan_cfg_get_wid(wilc->cfg_frame.frame, offset, wid);
1057         offset += ret_size;
1058         wilc->cfg_frame_offset = offset;
1059
1060         if (!commit) {
1061                 mutex_unlock(&wilc->cfg_cmd_lock);
1062                 return ret_size;
1063         }
1064
1065         if (wilc_wlan_cfg_commit(vif, WILC_CFG_QUERY, drv_handler))
1066                 ret_size = 0;
1067
1068         if (!wait_for_completion_timeout(&wilc->cfg_event,
1069                                          WILC_CFG_PKTS_TIMEOUT)) {
1070                 netdev_dbg(vif->ndev, "%s: Timed Out\n", __func__);
1071                 ret_size = 0;
1072         }
1073         wilc->cfg_frame_offset = 0;
1074         wilc->cfg_seq_no += 1;
1075         mutex_unlock(&wilc->cfg_cmd_lock);
1076
1077         return ret_size;
1078 }
1079
1080 int wilc_send_config_pkt(struct wilc_vif *vif, u8 mode, struct wid *wids,
1081                          u32 count)
1082 {
1083         int i;
1084         int ret = 0;
1085         u32 drv = wilc_get_vif_idx(vif);
1086
1087         if (mode == WILC_GET_CFG) {
1088                 for (i = 0; i < count; i++) {
1089                         if (!wilc_wlan_cfg_get(vif, !i,
1090                                                wids[i].id,
1091                                                (i == count - 1),
1092                                                drv)) {
1093                                 ret = -ETIMEDOUT;
1094                                 break;
1095                         }
1096                 }
1097                 for (i = 0; i < count; i++) {
1098                         wids[i].size = wilc_wlan_cfg_get_val(vif->wilc,
1099                                                              wids[i].id,
1100                                                              wids[i].val,
1101                                                              wids[i].size);
1102                 }
1103         } else if (mode == WILC_SET_CFG) {
1104                 for (i = 0; i < count; i++) {
1105                         if (!wilc_wlan_cfg_set(vif, !i,
1106                                                wids[i].id,
1107                                                wids[i].val,
1108                                                wids[i].size,
1109                                                (i == count - 1),
1110                                                drv)) {
1111                                 ret = -ETIMEDOUT;
1112                                 break;
1113                         }
1114                 }
1115         }
1116
1117         return ret;
1118 }
1119
1120 static int init_chip(struct net_device *dev)
1121 {
1122         u32 chipid;
1123         u32 reg;
1124         int ret = 0;
1125         struct wilc_vif *vif = netdev_priv(dev);
1126         struct wilc *wilc = vif->wilc;
1127
1128         acquire_bus(wilc, WILC_BUS_ACQUIRE_ONLY);
1129
1130         chipid = wilc_get_chipid(wilc, true);
1131
1132         if ((chipid & 0xfff) != 0xa0) {
1133                 ret = wilc->hif_func->hif_read_reg(wilc,
1134                                                    WILC_CORTUS_RESET_MUX_SEL,
1135                                                    &reg);
1136                 if (ret) {
1137                         netdev_err(dev, "fail read reg 0x1118\n");
1138                         goto release;
1139                 }
1140                 reg |= BIT(0);
1141                 ret = wilc->hif_func->hif_write_reg(wilc,
1142                                                     WILC_CORTUS_RESET_MUX_SEL,
1143                                                     reg);
1144                 if (ret) {
1145                         netdev_err(dev, "fail write reg 0x1118\n");
1146                         goto release;
1147                 }
1148                 ret = wilc->hif_func->hif_write_reg(wilc,
1149                                                     WILC_CORTUS_BOOT_REGISTER,
1150                                                     WILC_CORTUS_BOOT_FROM_IRAM);
1151                 if (ret) {
1152                         netdev_err(dev, "fail write reg 0xc0000\n");
1153                         goto release;
1154                 }
1155         }
1156
1157 release:
1158         release_bus(wilc, WILC_BUS_RELEASE_ONLY);
1159
1160         return ret;
1161 }
1162
1163 u32 wilc_get_chipid(struct wilc *wilc, bool update)
1164 {
1165         static u32 chipid;
1166         u32 tempchipid = 0;
1167         u32 rfrevid = 0;
1168
1169         if (chipid == 0 || update) {
1170                 wilc->hif_func->hif_read_reg(wilc, WILC_CHIPID, &tempchipid);
1171                 wilc->hif_func->hif_read_reg(wilc, WILC_RF_REVISION_ID,
1172                                              &rfrevid);
1173                 if (!is_wilc1000(tempchipid)) {
1174                         chipid = 0;
1175                         return chipid;
1176                 }
1177                 if (tempchipid == WILC_1000_BASE_ID_2A) { /* 0x1002A0 */
1178                         if (rfrevid != 0x1)
1179                                 tempchipid = WILC_1000_BASE_ID_2A_REV1;
1180                 } else if (tempchipid == WILC_1000_BASE_ID_2B) { /* 0x1002B0 */
1181                         if (rfrevid == 0x4)
1182                                 tempchipid = WILC_1000_BASE_ID_2B_REV1;
1183                         else if (rfrevid != 0x3)
1184                                 tempchipid = WILC_1000_BASE_ID_2B_REV2;
1185                 }
1186
1187                 chipid = tempchipid;
1188         }
1189         return chipid;
1190 }
1191
1192 int wilc_wlan_init(struct net_device *dev)
1193 {
1194         int ret = 0;
1195         struct wilc_vif *vif = netdev_priv(dev);
1196         struct wilc *wilc;
1197
1198         wilc = vif->wilc;
1199
1200         wilc->quit = 0;
1201
1202         if (wilc->hif_func->hif_init(wilc, false)) {
1203                 ret = -EIO;
1204                 goto fail;
1205         }
1206
1207         if (!wilc->tx_buffer)
1208                 wilc->tx_buffer = kmalloc(WILC_TX_BUFF_SIZE, GFP_KERNEL);
1209
1210         if (!wilc->tx_buffer) {
1211                 ret = -ENOBUFS;
1212                 goto fail;
1213         }
1214
1215         if (!wilc->rx_buffer)
1216                 wilc->rx_buffer = kmalloc(WILC_RX_BUFF_SIZE, GFP_KERNEL);
1217
1218         if (!wilc->rx_buffer) {
1219                 ret = -ENOBUFS;
1220                 goto fail;
1221         }
1222
1223         if (init_chip(dev)) {
1224                 ret = -EIO;
1225                 goto fail;
1226         }
1227
1228         return 0;
1229
1230 fail:
1231
1232         kfree(wilc->rx_buffer);
1233         wilc->rx_buffer = NULL;
1234         kfree(wilc->tx_buffer);
1235         wilc->tx_buffer = NULL;
1236
1237         return ret;
1238 }