drivers/staging/gdm72xx/gdm_sdio.c

   1 /*
   2  * Copyright (c) 2012 GCT Semiconductor, Inc. All rights reserved.
   3  *
   4  * This software is licensed under the terms of the GNU General Public
   5  * License version 2, as published by the Free Software Foundation, and
   6  * may be copied, distributed, and modified under those terms.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  11  * GNU General Public License for more details.
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/init.h>
  16 #include <linux/kernel.h>
  17
  18 #include <linux/mmc/core.h>
  19 #include <linux/mmc/card.h>
  20 #include <linux/mmc/sdio_func.h>
  21 #include <linux/mmc/sdio_ids.h>
  22
  23 #include "gdm_sdio.h"
  24 #include "gdm_wimax.h"
  25 #include "sdio_boot.h"
  26 #include "hci.h"
  27
  28 #define TYPE_A_HEADER_SIZE      4
  29 #define TYPE_A_LOOKAHEAD_SIZE   16
  30
  31 #define MAX_NR_RX_BUF   4
  32
  33 #define SDU_TX_BUF_SIZE 2048
  34 #define TX_BUF_SIZE             2048
  35 #define TX_CHUNK_SIZE   (2048 - TYPE_A_HEADER_SIZE)
  36 #define RX_BUF_SIZE             (25*1024)
  37
  38 #define TX_HZ   2000
  39 #define TX_INTERVAL     (1000000/TX_HZ)
  40
  41 /*#define DEBUG*/
  42
  43 static int init_sdio(struct sdiowm_dev *sdev);
  44 static void release_sdio(struct sdiowm_dev *sdev);
  45
  46 #ifdef DEBUG
  47 static void hexdump(char *title, u8 *data, int len)
  48 {
  49         int i;
  50
  51         printk(KERN_DEBUG "%s: length = %d\n", title, len);
  52         for (i = 0; i < len; i++) {
  53                 printk(KERN_DEBUG "%02x ", data[i]);
  54                 if ((i & 0xf) == 0xf)
  55                         printk(KERN_DEBUG "\n");
  56         }
  57         printk(KERN_DEBUG "\n");
  58 }
  59 #endif
  60
  61 static struct sdio_tx *alloc_tx_struct(struct tx_cxt *tx)
  62 {
  63         struct sdio_tx *t = kzalloc(sizeof(*t), GFP_ATOMIC);
  64
  65         if (!t)
  66                 return NULL;
  67
  68         t->buf = kmalloc(TX_BUF_SIZE, GFP_ATOMIC);
  69         if (!t->buf) {
  70                 kfree(t);
  71                 return NULL;
  72         }
  73
  74         t->tx_cxt = tx;
  75
  76         return t;
  77 }
  78
  79 static void free_tx_struct(struct sdio_tx *t)
  80 {
  81         if (t) {
  82                 kfree(t->buf);
  83                 kfree(t);
  84         }
  85 }
  86
  87 static struct sdio_rx *alloc_rx_struct(struct rx_cxt *rx)
  88 {
  89         struct sdio_rx *r = kzalloc(sizeof(*r), GFP_ATOMIC);
  90
  91         if (r)
  92                 r->rx_cxt = rx;
  93
  94         return r;
  95 }
  96
  97 static void free_rx_struct(struct sdio_rx *r)
  98 {
  99         kfree(r);
 100 }
 101
 102 /* Before this function is called, spin lock should be locked. */
 103 static struct sdio_tx *get_tx_struct(struct tx_cxt *tx, int *no_spc)
 104 {
 105         struct sdio_tx *t;
 106
 107         if (list_empty(&tx->free_list))
 108                 return NULL;
 109
 110         t = list_entry(tx->free_list.prev, struct sdio_tx, list);
 111         list_del(&t->list);
 112
 113         *no_spc = list_empty(&tx->free_list) ? 1 : 0;
 114
 115         return t;
 116 }
 117
 118 /* Before this function is called, spin lock should be locked. */
 119 static void put_tx_struct(struct tx_cxt *tx, struct sdio_tx *t)
 120 {
 121         list_add_tail(&t->list, &tx->free_list);
 122 }
 123
 124 /* Before this function is called, spin lock should be locked. */
 125 static struct sdio_rx *get_rx_struct(struct rx_cxt *rx)
 126 {
 127         struct sdio_rx *r;
 128
 129         if (list_empty(&rx->free_list))
 130                 return NULL;
 131
 132         r = list_entry(rx->free_list.prev, struct sdio_rx, list);
 133         list_del(&r->list);
 134
 135         return r;
 136 }
 137
 138 /* Before this function is called, spin lock should be locked. */
 139 static void put_rx_struct(struct rx_cxt *rx, struct sdio_rx *r)
 140 {
 141         list_add_tail(&r->list, &rx->free_list);
 142 }
 143
 144 static int init_sdio(struct sdiowm_dev *sdev)
 145 {
 146         int ret = 0, i;
 147         struct tx_cxt   *tx = &sdev->tx;
 148         struct rx_cxt   *rx = &sdev->rx;
 149         struct sdio_tx  *t;
 150         struct sdio_rx  *r;
 151
 152         INIT_LIST_HEAD(&tx->free_list);
 153         INIT_LIST_HEAD(&tx->sdu_list);
 154         INIT_LIST_HEAD(&tx->hci_list);
 155
 156         spin_lock_init(&tx->lock);
 157
 158         tx->sdu_buf = kmalloc(SDU_TX_BUF_SIZE, GFP_KERNEL);
 159         if (tx->sdu_buf == NULL) {
 160                 printk(KERN_ERR "Failed to allocate SDU tx buffer.\n");
 161                 goto fail;
 162         }
 163
 164         for (i = 0; i < MAX_NR_SDU_BUF; i++) {
 165                 t = alloc_tx_struct(tx);
 166                 if (t == NULL) {
 167                         ret = -ENOMEM;
 168                         goto fail;
 169                 }
 170                 list_add(&t->list, &tx->free_list);
 171         }
 172
 173         INIT_LIST_HEAD(&rx->free_list);
 174         INIT_LIST_HEAD(&rx->req_list);
 175
 176         spin_lock_init(&rx->lock);
 177
 178         for (i = 0; i < MAX_NR_RX_BUF; i++) {
 179                 r = alloc_rx_struct(rx);
 180                 if (r == NULL) {
 181                         ret = -ENOMEM;
 182                         goto fail;
 183                 }
 184                 list_add(&r->list, &rx->free_list);
 185         }
 186
 187         rx->rx_buf = kmalloc(RX_BUF_SIZE, GFP_KERNEL);
 188         if (rx->rx_buf == NULL) {
 189                 printk(KERN_ERR "Failed to allocate rx buffer.\n");
 190                 goto fail;
 191         }
 192
 193         return 0;
 194
 195 fail:
 196         release_sdio(sdev);
 197         return ret;
 198 }
 199
 200 static void release_sdio(struct sdiowm_dev *sdev)
 201 {
 202         struct tx_cxt   *tx = &sdev->tx;
 203         struct rx_cxt   *rx = &sdev->rx;
 204         struct sdio_tx  *t, *t_next;
 205         struct sdio_rx  *r, *r_next;
 206
 207         kfree(tx->sdu_buf);
 208
 209         list_for_each_entry_safe(t, t_next, &tx->free_list, list) {
 210                 list_del(&t->list);
 211                 free_tx_struct(t);
 212         }
 213
 214         list_for_each_entry_safe(t, t_next, &tx->sdu_list, list) {
 215                 list_del(&t->list);
 216                 free_tx_struct(t);
 217         }
 218
 219         list_for_each_entry_safe(t, t_next, &tx->hci_list, list) {
 220                 list_del(&t->list);
 221                 free_tx_struct(t);
 222         }
 223
 224         kfree(rx->rx_buf);
 225
 226         list_for_each_entry_safe(r, r_next, &rx->free_list, list) {
 227                 list_del(&r->list);
 228                 free_rx_struct(r);
 229         }
 230
 231         list_for_each_entry_safe(r, r_next, &rx->req_list, list) {
 232                 list_del(&r->list);
 233                 free_rx_struct(r);
 234         }
 235 }
 236
 237 static void send_sdio_pkt(struct sdio_func *func, u8 *data, int len)
 238 {
 239         int n, blocks, ret, remain;
 240
 241         sdio_claim_host(func);
 242
 243         blocks = len / func->cur_blksize;
 244         n = blocks * func->cur_blksize;
 245         if (blocks) {
 246                 ret = sdio_memcpy_toio(func, 0, data, n);
 247                 if (ret < 0) {
 248                         if (ret != -ENOMEDIUM)
 249                                 printk(KERN_ERR "gdmwms: %s error: ret = %d\n",
 250                                         __func__, ret);
 251                         goto end_io;
 252                 }
 253         }
 254
 255         remain = len - n;
 256         remain = (remain + 3) & ~3;
 257
 258         if (remain) {
 259                 ret = sdio_memcpy_toio(func, 0, data + n, remain);
 260                 if (ret < 0) {
 261                         if (ret != -ENOMEDIUM)
 262                                 printk(KERN_ERR "gdmwms: %s error: ret = %d\n",
 263                                         __func__, ret);
 264                         goto end_io;
 265                 }
 266         }
 267
 268 end_io:
 269         sdio_release_host(func);
 270 }
 271
 272 static void send_sdu(struct sdio_func *func, struct tx_cxt *tx)
 273 {
 274         struct list_head *l, *next;
 275         struct hci_s *hci;
 276         struct sdio_tx *t;
 277         int pos, len, i, estlen, aggr_num = 0, aggr_len;
 278         u8 *buf;
 279         unsigned long flags;
 280
 281         spin_lock_irqsave(&tx->lock, flags);
 282
 283         pos = TYPE_A_HEADER_SIZE + HCI_HEADER_SIZE;
 284         list_for_each_entry(t, &tx->sdu_list, list) {
 285                 estlen = ((t->len + 3) & ~3) + 4;
 286                 if ((pos + estlen) > SDU_TX_BUF_SIZE)
 287                         break;
 288
 289                 aggr_num++;
 290                 memcpy(tx->sdu_buf + pos, t->buf, t->len);
 291                 memset(tx->sdu_buf + pos + t->len, 0, estlen - t->len);
 292                 pos += estlen;
 293         }
 294         aggr_len = pos;
 295
 296         hci = (struct hci_s *)(tx->sdu_buf + TYPE_A_HEADER_SIZE);
 297         hci->cmd_evt = H2B(WIMAX_TX_SDU_AGGR);
 298         hci->length = H2B(aggr_len - TYPE_A_HEADER_SIZE - HCI_HEADER_SIZE);
 299
 300         spin_unlock_irqrestore(&tx->lock, flags);
 301
 302 #ifdef DEBUG
 303         hexdump("sdio_send", tx->sdu_buf + TYPE_A_HEADER_SIZE,
 304                 aggr_len - TYPE_A_HEADER_SIZE);
 305 #endif
 306
 307         for (pos = TYPE_A_HEADER_SIZE; pos < aggr_len; pos += TX_CHUNK_SIZE) {
 308                 len = aggr_len - pos;
 309                 len = len > TX_CHUNK_SIZE ? TX_CHUNK_SIZE : len;
 310                 buf = tx->sdu_buf + pos - TYPE_A_HEADER_SIZE;
 311
 312                 buf[0] = len & 0xff;
 313                 buf[1] = (len >> 8) & 0xff;
 314                 buf[2] = (len >> 16) & 0xff;
 315                 buf[3] = (pos + len) >= aggr_len ? 0 : 1;
 316                 send_sdio_pkt(func, buf, len + TYPE_A_HEADER_SIZE);
 317         }
 318
 319         spin_lock_irqsave(&tx->lock, flags);
 320
 321         for (l = tx->sdu_list.next, i = 0; i < aggr_num; i++, l = next) {
 322                 next = l->next;
 323                 t = list_entry(l, struct sdio_tx, list);
 324                 if (t->callback)
 325                         t->callback(t->cb_data);
 326
 327                 list_del(l);
 328                 put_tx_struct(t->tx_cxt, t);
 329         }
 330
 331         do_gettimeofday(&tx->sdu_stamp);
 332         spin_unlock_irqrestore(&tx->lock, flags);
 333 }
 334
 335 static void send_hci(struct sdio_func *func, struct tx_cxt *tx,
 336                         struct sdio_tx *t)
 337 {
 338         unsigned long flags;
 339
 340 #ifdef DEBUG
 341         hexdump("sdio_send", t->buf + TYPE_A_HEADER_SIZE,
 342                 t->len - TYPE_A_HEADER_SIZE);
 343 #endif
 344         send_sdio_pkt(func, t->buf, t->len);
 345
 346         spin_lock_irqsave(&tx->lock, flags);
 347         if (t->callback)
 348                 t->callback(t->cb_data);
 349         free_tx_struct(t);
 350         spin_unlock_irqrestore(&tx->lock, flags);
 351 }
 352
 353 static void do_tx(struct work_struct *work)
 354 {
 355         struct sdiowm_dev *sdev = container_of(work, struct sdiowm_dev, ws);
 356         struct sdio_func *func = sdev->func;
 357         struct tx_cxt *tx = &sdev->tx;
 358         struct sdio_tx *t = NULL;
 359         struct timeval now, *before;
 360         int is_sdu = 0;
 361         long diff;
 362         unsigned long flags;
 363
 364         spin_lock_irqsave(&tx->lock, flags);
 365         if (!tx->can_send) {
 366                 spin_unlock_irqrestore(&tx->lock, flags);
 367                 return;
 368         }
 369
 370         if (!list_empty(&tx->hci_list)) {
 371                 t = list_entry(tx->hci_list.next, struct sdio_tx, list);
 372                 list_del(&t->list);
 373                 is_sdu = 0;
 374         } else if (!tx->stop_sdu_tx && !list_empty(&tx->sdu_list)) {
 375                 do_gettimeofday(&now);
 376                 before = &tx->sdu_stamp;
 377
 378                 diff = (now.tv_sec - before->tv_sec) * 1000000 +
 379                         (now.tv_usec - before->tv_usec);
 380                 if (diff >= 0 && diff < TX_INTERVAL) {
 381                         schedule_work(&sdev->ws);
 382                         spin_unlock_irqrestore(&tx->lock, flags);
 383                         return;
 384                 }
 385                 is_sdu = 1;
 386         }
 387
 388         if (!is_sdu && t == NULL) {
 389                 spin_unlock_irqrestore(&tx->lock, flags);
 390                 return;
 391         }
 392
 393         tx->can_send = 0;
 394
 395         spin_unlock_irqrestore(&tx->lock, flags);
 396
 397         if (is_sdu)
 398                 send_sdu(func, tx);
 399         else
 400                 send_hci(func, tx, t);
 401 }
 402
 403 static int gdm_sdio_send(void *priv_dev, void *data, int len,
 404                         void (*cb)(void *data), void *cb_data)
 405 {
 406         struct sdiowm_dev *sdev = priv_dev;
 407         struct tx_cxt *tx = &sdev->tx;
 408         struct sdio_tx *t;
 409         u8 *pkt = data;
 410         int no_spc = 0;
 411         u16 cmd_evt;
 412         unsigned long flags;
 413
 414         BUG_ON(len > TX_BUF_SIZE - TYPE_A_HEADER_SIZE);
 415
 416         spin_lock_irqsave(&tx->lock, flags);
 417
 418         cmd_evt = (pkt[0] << 8) | pkt[1];
 419         if (cmd_evt == WIMAX_TX_SDU) {
 420                 t = get_tx_struct(tx, &no_spc);
 421                 if (t == NULL) {
 422                         /* This case must not happen. */
 423                         spin_unlock_irqrestore(&tx->lock, flags);
 424                         return -ENOSPC;
 425                 }
 426                 list_add_tail(&t->list, &tx->sdu_list);
 427
 428                 memcpy(t->buf, data, len);
 429
 430                 t->len = len;
 431                 t->callback = cb;
 432                 t->cb_data = cb_data;
 433         } else {
 434                 t = alloc_tx_struct(tx);
 435                 if (t == NULL) {
 436                         spin_unlock_irqrestore(&tx->lock, flags);
 437                         return -ENOMEM;
 438                 }
 439                 list_add_tail(&t->list, &tx->hci_list);
 440
 441                 t->buf[0] = len & 0xff;
 442                 t->buf[1] = (len >> 8) & 0xff;
 443                 t->buf[2] = (len >> 16) & 0xff;
 444                 t->buf[3] = 2;
 445                 memcpy(t->buf + TYPE_A_HEADER_SIZE, data, len);
 446
 447                 t->len = len + TYPE_A_HEADER_SIZE;
 448                 t->callback = cb;
 449                 t->cb_data = cb_data;
 450         }
 451
 452         if (tx->can_send)
 453                 schedule_work(&sdev->ws);
 454
 455         spin_unlock_irqrestore(&tx->lock, flags);
 456
 457         if (no_spc)
 458                 return -ENOSPC;
 459
 460         return 0;
 461 }
 462
 463 /*
 464  * Handle the HCI, WIMAX_SDU_TX_FLOW.
 465  */
 466 static int control_sdu_tx_flow(struct sdiowm_dev *sdev, u8 *hci_data, int len)
 467 {
 468         struct tx_cxt *tx = &sdev->tx;
 469         u16 cmd_evt;
 470         unsigned long flags;
 471
 472         spin_lock_irqsave(&tx->lock, flags);
 473
 474         cmd_evt = (hci_data[0] << 8) | (hci_data[1]);
 475         if (cmd_evt != WIMAX_SDU_TX_FLOW)
 476                 goto out;
 477
 478         if (hci_data[4] == 0) {
 479 #ifdef DEBUG
 480                 printk(KERN_DEBUG "WIMAX ==> STOP SDU TX\n");
 481 #endif
 482                 tx->stop_sdu_tx = 1;
 483         } else if (hci_data[4] == 1) {
 484 #ifdef DEBUG
 485                 printk(KERN_DEBUG "WIMAX ==> START SDU TX\n");
 486 #endif
 487                 tx->stop_sdu_tx = 0;
 488                 if (tx->can_send)
 489                         schedule_work(&sdev->ws);
 490                 /*
 491                  * If free buffer for sdu tx doesn't exist, then tx queue
 492                  * should not be woken. For this reason, don't pass the command,
 493                  * START_SDU_TX.
 494                  */
 495                 if (list_empty(&tx->free_list))
 496                         len = 0;
 497         }
 498
 499 out:
 500         spin_unlock_irqrestore(&tx->lock, flags);
 501         return len;
 502 }
 503
 504 static void gdm_sdio_irq(struct sdio_func *func)
 505 {
 506         struct phy_dev *phy_dev = sdio_get_drvdata(func);
 507         struct sdiowm_dev *sdev = phy_dev->priv_dev;
 508         struct tx_cxt *tx = &sdev->tx;
 509         struct rx_cxt *rx = &sdev->rx;
 510         struct sdio_rx *r;
 511         unsigned long flags;
 512         u8 val, hdr[TYPE_A_LOOKAHEAD_SIZE], *buf;
 513         u32 len, blocks, n;
 514         int ret, remain;
 515
 516         /* Check interrupt */
 517         val = sdio_readb(func, 0x13, &ret);
 518         if (val & 0x01)
 519                 sdio_writeb(func, 0x01, 0x13, &ret);    /* clear interrupt */
 520         else
 521                 return;
 522
 523         ret = sdio_memcpy_fromio(func, hdr, 0x0, TYPE_A_LOOKAHEAD_SIZE);
 524         if (ret) {
 525                 printk(KERN_ERR "Cannot read from function %d\n", func->num);
 526                 goto done;
 527         }
 528
 529         len = (hdr[2] << 16) | (hdr[1] << 8) | hdr[0];
 530         if (len > (RX_BUF_SIZE - TYPE_A_HEADER_SIZE)) {
 531                 printk(KERN_ERR "Too big Type-A size: %d\n", len);
 532                 goto done;
 533         }
 534
 535         if (hdr[3] == 1) {      /* Ack */
 536 #ifdef DEBUG
 537                 u32 *ack_seq = (u32 *)&hdr[4];
 538 #endif
 539                 spin_lock_irqsave(&tx->lock, flags);
 540                 tx->can_send = 1;
 541
 542                 if (!list_empty(&tx->sdu_list) || !list_empty(&tx->hci_list))
 543                         schedule_work(&sdev->ws);
 544                 spin_unlock_irqrestore(&tx->lock, flags);
 545 #ifdef DEBUG
 546                 printk(KERN_DEBUG "Ack... %0x\n", ntohl(*ack_seq));
 547 #endif
 548                 goto done;
 549         }
 550
 551         memcpy(rx->rx_buf, hdr + TYPE_A_HEADER_SIZE,
 552                         TYPE_A_LOOKAHEAD_SIZE - TYPE_A_HEADER_SIZE);
 553
 554         buf = rx->rx_buf + TYPE_A_LOOKAHEAD_SIZE - TYPE_A_HEADER_SIZE;
 555         remain = len - TYPE_A_LOOKAHEAD_SIZE + TYPE_A_HEADER_SIZE;
 556         if (remain <= 0)
 557                 goto end_io;
 558
 559         blocks = remain / func->cur_blksize;
 560
 561         if (blocks) {
 562                 n = blocks * func->cur_blksize;
 563                 ret = sdio_memcpy_fromio(func, buf, 0x0, n);
 564                 if (ret) {
 565                         printk(KERN_ERR "Cannot read from function %d\n",
 566                                 func->num);
 567                         goto done;
 568                 }
 569                 buf += n;
 570                 remain -= n;
 571         }
 572
 573         if (remain) {
 574                 ret = sdio_memcpy_fromio(func, buf, 0x0, remain);
 575                 if (ret) {
 576                         printk(KERN_ERR "Cannot read from function %d\n",
 577                                 func->num);
 578                         goto done;
 579                 }
 580         }
 581
 582 end_io:
 583 #ifdef DEBUG
 584         hexdump("sdio_receive", rx->rx_buf, len);
 585 #endif
 586         len = control_sdu_tx_flow(sdev, rx->rx_buf, len);
 587
 588         spin_lock_irqsave(&rx->lock, flags);
 589
 590         if (!list_empty(&rx->req_list)) {
 591                 r = list_entry(rx->req_list.next, struct sdio_rx, list);
 592                 spin_unlock_irqrestore(&rx->lock, flags);
 593                 if (r->callback)
 594                         r->callback(r->cb_data, rx->rx_buf, len);
 595                 spin_lock_irqsave(&rx->lock, flags);
 596                 list_del(&r->list);
 597                 put_rx_struct(rx, r);
 598         }
 599
 600         spin_unlock_irqrestore(&rx->lock, flags);
 601
 602 done:
 603         sdio_writeb(func, 0x00, 0x10, &ret);    /* PCRRT */
 604         if (!phy_dev->netdev)
 605                 register_wimax_device(phy_dev, &func->dev);
 606 }
 607
 608 static int gdm_sdio_receive(void *priv_dev,
 609                                 void (*cb)(void *cb_data, void *data, int len),
 610                                 void *cb_data)
 611 {
 612         struct sdiowm_dev *sdev = priv_dev;
 613         struct rx_cxt *rx = &sdev->rx;
 614         struct sdio_rx *r;
 615         unsigned long flags;
 616
 617         spin_lock_irqsave(&rx->lock, flags);
 618         r = get_rx_struct(rx);
 619         if (r == NULL) {
 620                 spin_unlock_irqrestore(&rx->lock, flags);
 621                 return -ENOMEM;
 622         }
 623
 624         r->callback = cb;
 625         r->cb_data = cb_data;
 626
 627         list_add_tail(&r->list, &rx->req_list);
 628         spin_unlock_irqrestore(&rx->lock, flags);
 629
 630         return 0;
 631 }
 632
 633 static int sdio_wimax_probe(struct sdio_func *func,
 634                                 const struct sdio_device_id *id)
 635 {
 636         int ret;
 637         struct phy_dev *phy_dev = NULL;
 638         struct sdiowm_dev *sdev = NULL;
 639
 640         printk(KERN_INFO "Found GDM SDIO VID = 0x%04x PID = 0x%04x...\n",
 641                         func->vendor, func->device);
 642         printk(KERN_INFO "GCT WiMax driver version %s\n", DRIVER_VERSION);
 643
 644         sdio_claim_host(func);
 645         sdio_enable_func(func);
 646         sdio_claim_irq(func, gdm_sdio_irq);
 647
 648         ret = sdio_boot(func);
 649         if (ret)
 650                 return ret;
 651
 652         phy_dev = kzalloc(sizeof(*phy_dev), GFP_KERNEL);
 653         if (phy_dev == NULL) {
 654                 ret = -ENOMEM;
 655                 goto out;
 656         }
 657         sdev = kzalloc(sizeof(*sdev), GFP_KERNEL);
 658         if (sdev == NULL) {
 659                 ret = -ENOMEM;
 660                 goto out;
 661         }
 662
 663         phy_dev->priv_dev = (void *)sdev;
 664         phy_dev->send_func = gdm_sdio_send;
 665         phy_dev->rcv_func = gdm_sdio_receive;
 666
 667         ret = init_sdio(sdev);
 668         if (ret < 0)
 669                 goto out;
 670
 671         sdev->func = func;
 672
 673         sdio_writeb(func, 1, 0x14, &ret);       /* Enable interrupt */
 674         sdio_release_host(func);
 675
 676         INIT_WORK(&sdev->ws, do_tx);
 677
 678         sdio_set_drvdata(func, phy_dev);
 679 out:
 680         if (ret) {
 681                 kfree(phy_dev);
 682                 kfree(sdev);
 683         }
 684
 685         return ret;
 686 }
 687
 688 static void sdio_wimax_remove(struct sdio_func *func)
 689 {
 690         struct phy_dev *phy_dev = sdio_get_drvdata(func);
 691         struct sdiowm_dev *sdev = phy_dev->priv_dev;
 692
 693         if (phy_dev->netdev)
 694                 unregister_wimax_device(phy_dev);
 695         sdio_claim_host(func);
 696         sdio_release_irq(func);
 697         sdio_disable_func(func);
 698         sdio_release_host(func);
 699         release_sdio(sdev);
 700
 701         kfree(sdev);
 702         kfree(phy_dev);
 703 }
 704
 705 static const struct sdio_device_id sdio_wimax_ids[] = {
 706         { SDIO_DEVICE(0x0296, 0x5347) },
 707         {0}
 708 };
 709
 710 MODULE_DEVICE_TABLE(sdio, sdio_wimax_ids);
 711
 712 static struct sdio_driver sdio_wimax_driver = {
 713         .probe          = sdio_wimax_probe,
 714         .remove         = sdio_wimax_remove,
 715         .name           = "sdio_wimax",
 716         .id_table       = sdio_wimax_ids,
 717 };
 718
 719 static int __init sdio_gdm_wimax_init(void)
 720 {
 721         return sdio_register_driver(&sdio_wimax_driver);
 722 }
 723
 724 static void __exit sdio_gdm_wimax_exit(void)
 725 {
 726         sdio_unregister_driver(&sdio_wimax_driver);
 727 }
 728
 729 module_init(sdio_gdm_wimax_init);
 730 module_exit(sdio_gdm_wimax_exit);
 731
 732 MODULE_VERSION(DRIVER_VERSION);
 733 MODULE_DESCRIPTION("GCT WiMax SDIO Device Driver");
 734 MODULE_AUTHOR("Ethan Park");
 735 MODULE_LICENSE("GPL");