drivers/net/wireless/ath/ath6kl/sdio.c

   1 /*
   2  * Copyright (c) 2004-2011 Atheros Communications Inc.
   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
  11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  15  */
  16
  17 #include <linux/mmc/card.h>
  18 #include <linux/mmc/mmc.h>
  19 #include <linux/mmc/host.h>
  20 #include <linux/mmc/sdio_func.h>
  21 #include <linux/mmc/sdio_ids.h>
  22 #include <linux/mmc/sdio.h>
  23 #include <linux/mmc/sd.h>
  24 #include "htc_hif.h"
  25 #include "hif-ops.h"
  26 #include "target.h"
  27 #include "debug.h"
  28
  29 struct ath6kl_sdio {
  30         struct sdio_func *func;
  31
  32         spinlock_t lock;
  33
  34         /* free list */
  35         struct list_head bus_req_freeq;
  36
  37         /* available bus requests */
  38         struct bus_request bus_req[BUS_REQUEST_MAX_NUM];
  39
  40         struct ath6kl *ar;
  41         u8 *dma_buffer;
  42
  43         /* scatter request list head */
  44         struct list_head scat_req;
  45
  46         spinlock_t scat_lock;
  47         bool is_disabled;
  48         atomic_t irq_handling;
  49         const struct sdio_device_id *id;
  50         struct work_struct wr_async_work;
  51         struct list_head wr_asyncq;
  52         spinlock_t wr_async_lock;
  53 };
  54
  55 #define CMD53_ARG_READ          0
  56 #define CMD53_ARG_WRITE         1
  57 #define CMD53_ARG_BLOCK_BASIS   1
  58 #define CMD53_ARG_FIXED_ADDRESS 0
  59 #define CMD53_ARG_INCR_ADDRESS  1
  60
  61 static inline struct ath6kl_sdio *ath6kl_sdio_priv(struct ath6kl *ar)
  62 {
  63         return ar->hif_priv;
  64 }
  65
  66 /*
  67  * Macro to check if DMA buffer is WORD-aligned and DMA-able.
  68  * Most host controllers assume the buffer is DMA'able and will
  69  * bug-check otherwise (i.e. buffers on the stack). virt_addr_valid
  70  * check fails on stack memory.
  71  */
  72 static inline bool buf_needs_bounce(u8 *buf)
  73 {
  74         return ((unsigned long) buf & 0x3) || !virt_addr_valid(buf);
  75 }
  76
  77 static void ath6kl_sdio_set_mbox_info(struct ath6kl *ar)
  78 {
  79         struct ath6kl_mbox_info *mbox_info = &ar->mbox_info;
  80
  81         /* EP1 has an extended range */
  82         mbox_info->htc_addr = HIF_MBOX_BASE_ADDR;
  83         mbox_info->htc_ext_addr = HIF_MBOX0_EXT_BASE_ADDR;
  84         mbox_info->htc_ext_sz = HIF_MBOX0_EXT_WIDTH;
  85         mbox_info->block_size = HIF_MBOX_BLOCK_SIZE;
  86         mbox_info->gmbox_addr = HIF_GMBOX_BASE_ADDR;
  87         mbox_info->gmbox_sz = HIF_GMBOX_WIDTH;
  88 }
  89
  90 static inline void ath6kl_sdio_set_cmd53_arg(u32 *arg, u8 rw, u8 func,
  91                                              u8 mode, u8 opcode, u32 addr,
  92                                              u16 blksz)
  93 {
  94         *arg = (((rw & 1) << 31) |
  95                 ((func & 0x7) << 28) |
  96                 ((mode & 1) << 27) |
  97                 ((opcode & 1) << 26) |
  98                 ((addr & 0x1FFFF) << 9) |
  99                 (blksz & 0x1FF));
 100 }
 101
 102 static inline void ath6kl_sdio_set_cmd52_arg(u32 *arg, u8 write, u8 raw,
 103                                              unsigned int address,
 104                                              unsigned char val)
 105 {
 106         const u8 func = 0;
 107
 108         *arg = ((write & 1) << 31) |
 109                ((func & 0x7) << 28) |
 110                ((raw & 1) << 27) |
 111                (1 << 26) |
 112                ((address & 0x1FFFF) << 9) |
 113                (1 << 8) |
 114                (val & 0xFF);
 115 }
 116
 117 static int ath6kl_sdio_func0_cmd52_wr_byte(struct mmc_card *card,
 118                                            unsigned int address,
 119                                            unsigned char byte)
 120 {
 121         struct mmc_command io_cmd;
 122
 123         memset(&io_cmd, 0, sizeof(io_cmd));
 124         ath6kl_sdio_set_cmd52_arg(&io_cmd.arg, 1, 0, address, byte);
 125         io_cmd.opcode = SD_IO_RW_DIRECT;
 126         io_cmd.flags = MMC_RSP_R5 | MMC_CMD_AC;
 127
 128         return mmc_wait_for_cmd(card->host, &io_cmd, 0);
 129 }
 130
 131 static int ath6kl_sdio_io(struct sdio_func *func, u32 request, u32 addr,
 132                           u8 *buf, u32 len)
 133 {
 134         int ret = 0;
 135
 136         if (request & HIF_WRITE) {
 137                 if (addr >= HIF_MBOX_BASE_ADDR &&
 138                     addr <= HIF_MBOX_END_ADDR)
 139                         addr += (HIF_MBOX_WIDTH - len);
 140
 141                 if (addr == HIF_MBOX0_EXT_BASE_ADDR)
 142                         addr += HIF_MBOX0_EXT_WIDTH - len;
 143
 144                 if (request & HIF_FIXED_ADDRESS)
 145                         ret = sdio_writesb(func, addr, buf, len);
 146                 else
 147                         ret = sdio_memcpy_toio(func, addr, buf, len);
 148         } else {
 149                 if (request & HIF_FIXED_ADDRESS)
 150                         ret = sdio_readsb(func, buf, addr, len);
 151                 else
 152                         ret = sdio_memcpy_fromio(func, buf, addr, len);
 153         }
 154
 155         return ret;
 156 }
 157
 158 static struct bus_request *ath6kl_sdio_alloc_busreq(struct ath6kl_sdio *ar_sdio)
 159 {
 160         struct bus_request *bus_req;
 161         unsigned long flag;
 162
 163         spin_lock_irqsave(&ar_sdio->lock, flag);
 164
 165         if (list_empty(&ar_sdio->bus_req_freeq)) {
 166                 spin_unlock_irqrestore(&ar_sdio->lock, flag);
 167                 return NULL;
 168         }
 169
 170         bus_req = list_first_entry(&ar_sdio->bus_req_freeq,
 171                                    struct bus_request, list);
 172         list_del(&bus_req->list);
 173
 174         spin_unlock_irqrestore(&ar_sdio->lock, flag);
 175         ath6kl_dbg(ATH6KL_DBG_TRC, "%s: bus request 0x%p\n", __func__, bus_req);
 176
 177         return bus_req;
 178 }
 179
 180 static void ath6kl_sdio_free_bus_req(struct ath6kl_sdio *ar_sdio,
 181                                      struct bus_request *bus_req)
 182 {
 183         unsigned long flag;
 184
 185         ath6kl_dbg(ATH6KL_DBG_TRC, "%s: bus request 0x%p\n", __func__, bus_req);
 186
 187         spin_lock_irqsave(&ar_sdio->lock, flag);
 188         list_add_tail(&bus_req->list, &ar_sdio->bus_req_freeq);
 189         spin_unlock_irqrestore(&ar_sdio->lock, flag);
 190 }
 191
 192 static void ath6kl_sdio_setup_scat_data(struct hif_scatter_req *scat_req,
 193                                         struct mmc_data *data)
 194 {
 195         struct scatterlist *sg;
 196         int i;
 197
 198         data->blksz = HIF_MBOX_BLOCK_SIZE;
 199         data->blocks = scat_req->len / HIF_MBOX_BLOCK_SIZE;
 200
 201         ath6kl_dbg(ATH6KL_DBG_SCATTER,
 202                    "hif-scatter: (%s) addr: 0x%X, (block len: %d, block count: %d) , (tot:%d,sg:%d)\n",
 203                    (scat_req->req & HIF_WRITE) ? "WR" : "RD", scat_req->addr,
 204                    data->blksz, data->blocks, scat_req->len,
 205                    scat_req->scat_entries);
 206
 207         data->flags = (scat_req->req & HIF_WRITE) ? MMC_DATA_WRITE :
 208                                                     MMC_DATA_READ;
 209
 210         /* fill SG entries */
 211         sg = scat_req->sgentries;
 212         sg_init_table(sg, scat_req->scat_entries);
 213
 214         /* assemble SG list */
 215         for (i = 0; i < scat_req->scat_entries; i++, sg++) {
 216                 if ((unsigned long)scat_req->scat_list[i].buf & 0x3)
 217                         /*
 218                          * Some scatter engines can handle unaligned
 219                          * buffers, print this as informational only.
 220                          */
 221                         ath6kl_dbg(ATH6KL_DBG_SCATTER,
 222                                    "(%s) scatter buffer is unaligned 0x%p\n",
 223                                    scat_req->req & HIF_WRITE ? "WR" : "RD",
 224                                    scat_req->scat_list[i].buf);
 225
 226                 ath6kl_dbg(ATH6KL_DBG_SCATTER, "%d: addr:0x%p, len:%d\n",
 227                            i, scat_req->scat_list[i].buf,
 228                            scat_req->scat_list[i].len);
 229
 230                 sg_set_buf(sg, scat_req->scat_list[i].buf,
 231                            scat_req->scat_list[i].len);
 232         }
 233
 234         /* set scatter-gather table for request */
 235         data->sg = scat_req->sgentries;
 236         data->sg_len = scat_req->scat_entries;
 237 }
 238
 239 static int ath6kl_sdio_scat_rw(struct ath6kl_sdio *ar_sdio,
 240                                struct bus_request *req)
 241 {
 242         struct mmc_request mmc_req;
 243         struct mmc_command cmd;
 244         struct mmc_data data;
 245         struct hif_scatter_req *scat_req;
 246         u8 opcode, rw;
 247         int status, len;
 248
 249         scat_req = req->scat_req;
 250
 251         if (scat_req->virt_scat) {
 252                 len = scat_req->len;
 253                 if (scat_req->req & HIF_BLOCK_BASIS)
 254                         len = round_down(len, HIF_MBOX_BLOCK_SIZE);
 255
 256                 status = ath6kl_sdio_io(ar_sdio->func, scat_req->req,
 257                                         scat_req->addr, scat_req->virt_dma_buf,
 258                                         len);
 259                 goto scat_complete;
 260         }
 261
 262         memset(&mmc_req, 0, sizeof(struct mmc_request));
 263         memset(&cmd, 0, sizeof(struct mmc_command));
 264         memset(&data, 0, sizeof(struct mmc_data));
 265
 266         ath6kl_sdio_setup_scat_data(scat_req, &data);
 267
 268         opcode = (scat_req->req & HIF_FIXED_ADDRESS) ?
 269                   CMD53_ARG_FIXED_ADDRESS : CMD53_ARG_INCR_ADDRESS;
 270
 271         rw = (scat_req->req & HIF_WRITE) ? CMD53_ARG_WRITE : CMD53_ARG_READ;
 272
 273         /* Fixup the address so that the last byte will fall on MBOX EOM */
 274         if (scat_req->req & HIF_WRITE) {
 275                 if (scat_req->addr == HIF_MBOX_BASE_ADDR)
 276                         scat_req->addr += HIF_MBOX_WIDTH - scat_req->len;
 277                 else
 278                         /* Uses extended address range */
 279                         scat_req->addr += HIF_MBOX0_EXT_WIDTH - scat_req->len;
 280         }
 281
 282         /* set command argument */
 283         ath6kl_sdio_set_cmd53_arg(&cmd.arg, rw, ar_sdio->func->num,
 284                                   CMD53_ARG_BLOCK_BASIS, opcode, scat_req->addr,
 285                                   data.blocks);
 286
 287         cmd.opcode = SD_IO_RW_EXTENDED;
 288         cmd.flags = MMC_RSP_SPI_R5 | MMC_RSP_R5 | MMC_CMD_ADTC;
 289
 290         mmc_req.cmd = &cmd;
 291         mmc_req.data = &data;
 292
 293         mmc_set_data_timeout(&data, ar_sdio->func->card);
 294         /* synchronous call to process request */
 295         mmc_wait_for_req(ar_sdio->func->card->host, &mmc_req);
 296
 297         status = cmd.error ? cmd.error : data.error;
 298
 299 scat_complete:
 300         scat_req->status = status;
 301
 302         if (scat_req->status)
 303                 ath6kl_err("Scatter write request failed:%d\n",
 304                            scat_req->status);
 305
 306         if (scat_req->req & HIF_ASYNCHRONOUS)
 307                 scat_req->complete(ar_sdio->ar->htc_target, scat_req);
 308
 309         return status;
 310 }
 311
 312 static int ath6kl_sdio_alloc_prep_scat_req(struct ath6kl_sdio *ar_sdio,
 313                                            int n_scat_entry, int n_scat_req,
 314                                            bool virt_scat)
 315 {
 316         struct hif_scatter_req *s_req;
 317         struct bus_request *bus_req;
 318         int i, scat_req_sz, scat_list_sz, sg_sz, buf_sz;
 319         u8 *virt_buf;
 320
 321         scat_list_sz = (n_scat_entry - 1) * sizeof(struct hif_scatter_item);
 322         scat_req_sz = sizeof(*s_req) + scat_list_sz;
 323
 324         if (!virt_scat)
 325                 sg_sz = sizeof(struct scatterlist) * n_scat_entry;
 326         else
 327                 buf_sz =  2 * L1_CACHE_BYTES +
 328                           ATH6KL_MAX_TRANSFER_SIZE_PER_SCATTER;
 329
 330         for (i = 0; i < n_scat_req; i++) {
 331                 /* allocate the scatter request */
 332                 s_req = kzalloc(scat_req_sz, GFP_KERNEL);
 333                 if (!s_req)
 334                         return -ENOMEM;
 335
 336                 if (virt_scat) {
 337                         virt_buf = kzalloc(buf_sz, GFP_KERNEL);
 338                         if (!virt_buf) {
 339                                 kfree(s_req);
 340                                 return -ENOMEM;
 341                         }
 342
 343                         s_req->virt_dma_buf =
 344                                 (u8 *)L1_CACHE_ALIGN((unsigned long)virt_buf);
 345                 } else {
 346                         /* allocate sglist */
 347                         s_req->sgentries = kzalloc(sg_sz, GFP_KERNEL);
 348
 349                         if (!s_req->sgentries) {
 350                                 kfree(s_req);
 351                                 return -ENOMEM;
 352                         }
 353                 }
 354
 355                 /* allocate a bus request for this scatter request */
 356                 bus_req = ath6kl_sdio_alloc_busreq(ar_sdio);
 357                 if (!bus_req) {
 358                         kfree(s_req->sgentries);
 359                         kfree(s_req->virt_dma_buf);
 360                         kfree(s_req);
 361                         return -ENOMEM;
 362                 }
 363
 364                 /* assign the scatter request to this bus request */
 365                 bus_req->scat_req = s_req;
 366                 s_req->busrequest = bus_req;
 367
 368                 s_req->virt_scat = virt_scat;
 369
 370                 /* add it to the scatter pool */
 371                 hif_scatter_req_add(ar_sdio->ar, s_req);
 372         }
 373
 374         return 0;
 375 }
 376
 377 static int ath6kl_sdio_read_write_sync(struct ath6kl *ar, u32 addr, u8 *buf,
 378                                        u32 len, u32 request)
 379 {
 380         struct ath6kl_sdio *ar_sdio = ath6kl_sdio_priv(ar);
 381         u8  *tbuf = NULL;
 382         int ret;
 383         bool bounced = false;
 384
 385         if (request & HIF_BLOCK_BASIS)
 386                 len = round_down(len, HIF_MBOX_BLOCK_SIZE);
 387
 388         if (buf_needs_bounce(buf)) {
 389                 if (!ar_sdio->dma_buffer)
 390                         return -ENOMEM;
 391                 tbuf = ar_sdio->dma_buffer;
 392                 memcpy(tbuf, buf, len);
 393                 bounced = true;
 394         } else
 395                 tbuf = buf;
 396
 397         sdio_claim_host(ar_sdio->func);
 398         ret = ath6kl_sdio_io(ar_sdio->func, request, addr, tbuf, len);
 399         if ((request & HIF_READ) && bounced)
 400                 memcpy(buf, tbuf, len);
 401         sdio_release_host(ar_sdio->func);
 402
 403         return ret;
 404 }
 405
 406 static void __ath6kl_sdio_write_async(struct ath6kl_sdio *ar_sdio,
 407                                       struct bus_request *req)
 408 {
 409         if (req->scat_req)
 410                 ath6kl_sdio_scat_rw(ar_sdio, req);
 411         else {
 412                 void *context;
 413                 int status;
 414
 415                 status = ath6kl_sdio_read_write_sync(ar_sdio->ar, req->address,
 416                                                      req->buffer, req->length,
 417                                                      req->request);
 418                 context = req->packet;
 419                 ath6kl_sdio_free_bus_req(ar_sdio, req);
 420                 ath6kldev_rw_comp_handler(context, status);
 421         }
 422 }
 423
 424 static void ath6kl_sdio_write_async_work(struct work_struct *work)
 425 {
 426         struct ath6kl_sdio *ar_sdio;
 427         unsigned long flags;
 428         struct bus_request *req, *tmp_req;
 429
 430         ar_sdio = container_of(work, struct ath6kl_sdio, wr_async_work);
 431         sdio_claim_host(ar_sdio->func);
 432
 433         spin_lock_irqsave(&ar_sdio->wr_async_lock, flags);
 434         list_for_each_entry_safe(req, tmp_req, &ar_sdio->wr_asyncq, list) {
 435                 list_del(&req->list);
 436                 spin_unlock_irqrestore(&ar_sdio->wr_async_lock, flags);
 437                 __ath6kl_sdio_write_async(ar_sdio, req);
 438                 spin_lock_irqsave(&ar_sdio->wr_async_lock, flags);
 439         }
 440         spin_unlock_irqrestore(&ar_sdio->wr_async_lock, flags);
 441
 442         sdio_release_host(ar_sdio->func);
 443 }
 444
 445 static void ath6kl_sdio_irq_handler(struct sdio_func *func)
 446 {
 447         int status;
 448         struct ath6kl_sdio *ar_sdio;
 449
 450         ar_sdio = sdio_get_drvdata(func);
 451         atomic_set(&ar_sdio->irq_handling, 1);
 452
 453         /*
 454          * Release the host during interrups so we can pick it back up when
 455          * we process commands.
 456          */
 457         sdio_release_host(ar_sdio->func);
 458
 459         status = ath6kldev_intr_bh_handler(ar_sdio->ar);
 460         sdio_claim_host(ar_sdio->func);
 461         atomic_set(&ar_sdio->irq_handling, 0);
 462         WARN_ON(status && status != -ECANCELED);
 463 }
 464
 465 static int ath6kl_sdio_power_on(struct ath6kl_sdio *ar_sdio)
 466 {
 467         struct sdio_func *func = ar_sdio->func;
 468         int ret = 0;
 469
 470         if (!ar_sdio->is_disabled)
 471                 return 0;
 472
 473         sdio_claim_host(func);
 474
 475         ret = sdio_enable_func(func);
 476         if (ret) {
 477                 ath6kl_err("Unable to enable sdio func: %d)\n", ret);
 478                 sdio_release_host(func);
 479                 return ret;
 480         }
 481
 482         sdio_release_host(func);
 483
 484         /*
 485          * Wait for hardware to initialise. It should take a lot less than
 486          * 10 ms but let's be conservative here.
 487          */
 488         msleep(10);
 489
 490         ar_sdio->is_disabled = false;
 491
 492         return ret;
 493 }
 494
 495 static int ath6kl_sdio_power_off(struct ath6kl_sdio *ar_sdio)
 496 {
 497         int ret;
 498
 499         if (ar_sdio->is_disabled)
 500                 return 0;
 501
 502         /* Disable the card */
 503         sdio_claim_host(ar_sdio->func);
 504         ret = sdio_disable_func(ar_sdio->func);
 505         sdio_release_host(ar_sdio->func);
 506
 507         if (ret)
 508                 return ret;
 509
 510         ar_sdio->is_disabled = true;
 511
 512         return ret;
 513 }
 514
 515 static int ath6kl_sdio_write_async(struct ath6kl *ar, u32 address, u8 *buffer,
 516                                    u32 length, u32 request,
 517                                    struct htc_packet *packet)
 518 {
 519         struct ath6kl_sdio *ar_sdio = ath6kl_sdio_priv(ar);
 520         struct bus_request *bus_req;
 521         unsigned long flags;
 522
 523         bus_req = ath6kl_sdio_alloc_busreq(ar_sdio);
 524
 525         if (!bus_req)
 526                 return -ENOMEM;
 527
 528         bus_req->address = address;
 529         bus_req->buffer = buffer;
 530         bus_req->length = length;
 531         bus_req->request = request;
 532         bus_req->packet = packet;
 533
 534         spin_lock_irqsave(&ar_sdio->wr_async_lock, flags);
 535         list_add_tail(&bus_req->list, &ar_sdio->wr_asyncq);
 536         spin_unlock_irqrestore(&ar_sdio->wr_async_lock, flags);
 537         queue_work(ar->ath6kl_wq, &ar_sdio->wr_async_work);
 538
 539         return 0;
 540 }
 541
 542 static void ath6kl_sdio_irq_enable(struct ath6kl *ar)
 543 {
 544         struct ath6kl_sdio *ar_sdio = ath6kl_sdio_priv(ar);
 545         int ret;
 546
 547         sdio_claim_host(ar_sdio->func);
 548
 549         /* Register the isr */
 550         ret =  sdio_claim_irq(ar_sdio->func, ath6kl_sdio_irq_handler);
 551         if (ret)
 552                 ath6kl_err("Failed to claim sdio irq: %d\n", ret);
 553
 554         sdio_release_host(ar_sdio->func);
 555 }
 556
 557 static void ath6kl_sdio_irq_disable(struct ath6kl *ar)
 558 {
 559         struct ath6kl_sdio *ar_sdio = ath6kl_sdio_priv(ar);
 560         int ret;
 561
 562         sdio_claim_host(ar_sdio->func);
 563
 564         /* Mask our function IRQ */
 565         while (atomic_read(&ar_sdio->irq_handling)) {
 566                 sdio_release_host(ar_sdio->func);
 567                 schedule_timeout(HZ / 10);
 568                 sdio_claim_host(ar_sdio->func);
 569         }
 570
 571         ret = sdio_release_irq(ar_sdio->func);
 572         if (ret)
 573                 ath6kl_err("Failed to release sdio irq: %d\n", ret);
 574
 575         sdio_release_host(ar_sdio->func);
 576 }
 577
 578 static struct hif_scatter_req *ath6kl_sdio_scatter_req_get(struct ath6kl *ar)
 579 {
 580         struct ath6kl_sdio *ar_sdio = ath6kl_sdio_priv(ar);
 581         struct hif_scatter_req *node = NULL;
 582         unsigned long flag;
 583
 584         spin_lock_irqsave(&ar_sdio->scat_lock, flag);
 585
 586         if (!list_empty(&ar_sdio->scat_req)) {
 587                 node = list_first_entry(&ar_sdio->scat_req,
 588                                         struct hif_scatter_req, list);
 589                 list_del(&node->list);
 590         }
 591
 592         spin_unlock_irqrestore(&ar_sdio->scat_lock, flag);
 593
 594         return node;
 595 }
 596
 597 static void ath6kl_sdio_scatter_req_add(struct ath6kl *ar,
 598                                         struct hif_scatter_req *s_req)
 599 {
 600         struct ath6kl_sdio *ar_sdio = ath6kl_sdio_priv(ar);
 601         unsigned long flag;
 602
 603         spin_lock_irqsave(&ar_sdio->scat_lock, flag);
 604
 605         list_add_tail(&s_req->list, &ar_sdio->scat_req);
 606
 607         spin_unlock_irqrestore(&ar_sdio->scat_lock, flag);
 608
 609 }
 610
 611 /* scatter gather read write request */
 612 static int ath6kl_sdio_async_rw_scatter(struct ath6kl *ar,
 613                                         struct hif_scatter_req *scat_req)
 614 {
 615         struct ath6kl_sdio *ar_sdio = ath6kl_sdio_priv(ar);
 616         u32 request = scat_req->req;
 617         int status = 0;
 618         unsigned long flags;
 619
 620         if (!scat_req->len)
 621                 return -EINVAL;
 622
 623         ath6kl_dbg(ATH6KL_DBG_SCATTER,
 624                 "hif-scatter: total len: %d scatter entries: %d\n",
 625                 scat_req->len, scat_req->scat_entries);
 626
 627         if (request & HIF_SYNCHRONOUS) {
 628                 sdio_claim_host(ar_sdio->func);
 629                 status = ath6kl_sdio_scat_rw(ar_sdio, scat_req->busrequest);
 630                 sdio_release_host(ar_sdio->func);
 631         } else {
 632                 spin_lock_irqsave(&ar_sdio->wr_async_lock, flags);
 633                 list_add_tail(&scat_req->busrequest->list, &ar_sdio->wr_asyncq);
 634                 spin_unlock_irqrestore(&ar_sdio->wr_async_lock, flags);
 635                 queue_work(ar->ath6kl_wq, &ar_sdio->wr_async_work);
 636         }
 637
 638         return status;
 639 }
 640
 641 /* clean up scatter support */
 642 static void ath6kl_sdio_cleanup_scatter(struct ath6kl *ar)
 643 {
 644         struct ath6kl_sdio *ar_sdio = ath6kl_sdio_priv(ar);
 645         struct hif_scatter_req *s_req, *tmp_req;
 646         unsigned long flag;
 647
 648         /* empty the free list */
 649         spin_lock_irqsave(&ar_sdio->scat_lock, flag);
 650         list_for_each_entry_safe(s_req, tmp_req, &ar_sdio->scat_req, list) {
 651                 list_del(&s_req->list);
 652                 spin_unlock_irqrestore(&ar_sdio->scat_lock, flag);
 653
 654                 if (s_req->busrequest)
 655                         ath6kl_sdio_free_bus_req(ar_sdio, s_req->busrequest);
 656                 kfree(s_req->virt_dma_buf);
 657                 kfree(s_req->sgentries);
 658                 kfree(s_req);
 659
 660                 spin_lock_irqsave(&ar_sdio->scat_lock, flag);
 661         }
 662         spin_unlock_irqrestore(&ar_sdio->scat_lock, flag);
 663 }
 664
 665 /* setup of HIF scatter resources */
 666 static int ath6kl_sdio_enable_scatter(struct ath6kl *ar)
 667 {
 668         struct ath6kl_sdio *ar_sdio = ath6kl_sdio_priv(ar);
 669         struct htc_target *target = ar->htc_target;
 670         int ret;
 671         bool virt_scat = false;
 672
 673         /* check if host supports scatter and it meets our requirements */
 674         if (ar_sdio->func->card->host->max_segs < MAX_SCATTER_ENTRIES_PER_REQ) {
 675                 ath6kl_err("host only supports scatter of :%d entries, need: %d\n",
 676                            ar_sdio->func->card->host->max_segs,
 677                            MAX_SCATTER_ENTRIES_PER_REQ);
 678                 virt_scat = true;
 679         }
 680
 681         if (!virt_scat) {
 682                 ret = ath6kl_sdio_alloc_prep_scat_req(ar_sdio,
 683                                 MAX_SCATTER_ENTRIES_PER_REQ,
 684                                 MAX_SCATTER_REQUESTS, virt_scat);
 685
 686                 if (!ret) {
 687                         ath6kl_dbg(ATH6KL_DBG_ANY,
 688                                    "hif-scatter enabled: max scatter req : %d entries: %d\n",
 689                                    MAX_SCATTER_REQUESTS,
 690                                    MAX_SCATTER_ENTRIES_PER_REQ);
 691
 692                         target->max_scat_entries = MAX_SCATTER_ENTRIES_PER_REQ;
 693                         target->max_xfer_szper_scatreq =
 694                                                 MAX_SCATTER_REQ_TRANSFER_SIZE;
 695                 } else {
 696                         ath6kl_sdio_cleanup_scatter(ar);
 697                         ath6kl_warn("hif scatter resource setup failed, trying virtual scatter method\n");
 698                 }
 699         }
 700
 701         if (virt_scat || ret) {
 702                 ret = ath6kl_sdio_alloc_prep_scat_req(ar_sdio,
 703                                 ATH6KL_SCATTER_ENTRIES_PER_REQ,
 704                                 ATH6KL_SCATTER_REQS, virt_scat);
 705
 706                 if (ret) {
 707                         ath6kl_err("failed to alloc virtual scatter resources !\n");
 708                         ath6kl_sdio_cleanup_scatter(ar);
 709                         return ret;
 710                 }
 711
 712                 ath6kl_dbg(ATH6KL_DBG_ANY,
 713                            "Vitual scatter enabled, max_scat_req:%d, entries:%d\n",
 714                            ATH6KL_SCATTER_REQS, ATH6KL_SCATTER_ENTRIES_PER_REQ);
 715
 716                 target->max_scat_entries = ATH6KL_SCATTER_ENTRIES_PER_REQ;
 717                 target->max_xfer_szper_scatreq =
 718                                         ATH6KL_MAX_TRANSFER_SIZE_PER_SCATTER;
 719         }
 720
 721         return 0;
 722 }
 723
 724 static const struct ath6kl_hif_ops ath6kl_sdio_ops = {
 725         .read_write_sync = ath6kl_sdio_read_write_sync,
 726         .write_async = ath6kl_sdio_write_async,
 727         .irq_enable = ath6kl_sdio_irq_enable,
 728         .irq_disable = ath6kl_sdio_irq_disable,
 729         .scatter_req_get = ath6kl_sdio_scatter_req_get,
 730         .scatter_req_add = ath6kl_sdio_scatter_req_add,
 731         .enable_scatter = ath6kl_sdio_enable_scatter,
 732         .scat_req_rw = ath6kl_sdio_async_rw_scatter,
 733         .cleanup_scatter = ath6kl_sdio_cleanup_scatter,
 734 };
 735
 736 static int ath6kl_sdio_probe(struct sdio_func *func,
 737                              const struct sdio_device_id *id)
 738 {
 739         int ret;
 740         struct ath6kl_sdio *ar_sdio;
 741         struct ath6kl *ar;
 742         int count;
 743
 744         ath6kl_dbg(ATH6KL_DBG_TRC,
 745                    "%s: func: 0x%X, vendor id: 0x%X, dev id: 0x%X, block size: 0x%X/0x%X\n",
 746                    __func__, func->num, func->vendor,
 747                    func->device, func->max_blksize, func->cur_blksize);
 748
 749         ar_sdio = kzalloc(sizeof(struct ath6kl_sdio), GFP_KERNEL);
 750         if (!ar_sdio)
 751                 return -ENOMEM;
 752
 753         ar_sdio->dma_buffer = kzalloc(HIF_DMA_BUFFER_SIZE, GFP_KERNEL);
 754         if (!ar_sdio->dma_buffer) {
 755                 ret = -ENOMEM;
 756                 goto err_hif;
 757         }
 758
 759         ar_sdio->func = func;
 760         sdio_set_drvdata(func, ar_sdio);
 761
 762         ar_sdio->id = id;
 763         ar_sdio->is_disabled = true;
 764
 765         spin_lock_init(&ar_sdio->lock);
 766         spin_lock_init(&ar_sdio->scat_lock);
 767         spin_lock_init(&ar_sdio->wr_async_lock);
 768
 769         INIT_LIST_HEAD(&ar_sdio->scat_req);
 770         INIT_LIST_HEAD(&ar_sdio->bus_req_freeq);
 771         INIT_LIST_HEAD(&ar_sdio->wr_asyncq);
 772
 773         INIT_WORK(&ar_sdio->wr_async_work, ath6kl_sdio_write_async_work);
 774
 775         for (count = 0; count < BUS_REQUEST_MAX_NUM; count++)
 776                 ath6kl_sdio_free_bus_req(ar_sdio, &ar_sdio->bus_req[count]);
 777
 778         ar = ath6kl_core_alloc(&ar_sdio->func->dev);
 779         if (!ar) {
 780                 ath6kl_err("Failed to alloc ath6kl core\n");
 781                 ret = -ENOMEM;
 782                 goto err_dma;
 783         }
 784
 785         ar_sdio->ar = ar;
 786         ar->hif_priv = ar_sdio;
 787         ar->hif_ops = &ath6kl_sdio_ops;
 788
 789         ath6kl_sdio_set_mbox_info(ar);
 790
 791         sdio_claim_host(func);
 792
 793         if ((ar_sdio->id->device & MANUFACTURER_ID_ATH6KL_BASE_MASK) >=
 794             MANUFACTURER_ID_AR6003_BASE) {
 795                 /* enable 4-bit ASYNC interrupt on AR6003 or later */
 796                 ret = ath6kl_sdio_func0_cmd52_wr_byte(func->card,
 797                                                 CCCR_SDIO_IRQ_MODE_REG,
 798                                                 SDIO_IRQ_MODE_ASYNC_4BIT_IRQ);
 799                 if (ret) {
 800                         ath6kl_err("Failed to enable 4-bit async irq mode %d\n",
 801                                    ret);
 802                         sdio_release_host(func);
 803                         goto err_dma;
 804                 }
 805
 806                 ath6kl_dbg(ATH6KL_DBG_TRC, "4-bit async irq mode enabled\n");
 807         }
 808
 809         /* give us some time to enable, in ms */
 810         func->enable_timeout = 100;
 811
 812         sdio_release_host(func);
 813
 814         ret = ath6kl_sdio_power_on(ar_sdio);
 815         if (ret)
 816                 goto err_dma;
 817
 818         sdio_claim_host(func);
 819
 820         ret = sdio_set_block_size(func, HIF_MBOX_BLOCK_SIZE);
 821         if (ret) {
 822                 ath6kl_err("Set sdio block size %d failed: %d)\n",
 823                            HIF_MBOX_BLOCK_SIZE, ret);
 824                 sdio_release_host(func);
 825                 goto err_off;
 826         }
 827
 828         sdio_release_host(func);
 829
 830         ret = ath6kl_core_init(ar);
 831         if (ret) {
 832                 ath6kl_err("Failed to init ath6kl core\n");
 833                 goto err_off;
 834         }
 835
 836         return ret;
 837
 838 err_off:
 839         ath6kl_sdio_power_off(ar_sdio);
 840 err_dma:
 841         kfree(ar_sdio->dma_buffer);
 842 err_hif:
 843         kfree(ar_sdio);
 844
 845         return ret;
 846 }
 847
 848 static void ath6kl_sdio_remove(struct sdio_func *func)
 849 {
 850         struct ath6kl_sdio *ar_sdio;
 851
 852         ar_sdio = sdio_get_drvdata(func);
 853
 854         ath6kl_stop_txrx(ar_sdio->ar);
 855         cancel_work_sync(&ar_sdio->wr_async_work);
 856
 857         ath6kl_unavail_ev(ar_sdio->ar);
 858
 859         ath6kl_sdio_power_off(ar_sdio);
 860
 861         kfree(ar_sdio->dma_buffer);
 862         kfree(ar_sdio);
 863 }
 864
 865 static const struct sdio_device_id ath6kl_sdio_devices[] = {
 866         {SDIO_DEVICE(MANUFACTURER_CODE, (MANUFACTURER_ID_AR6003_BASE | 0x0))},
 867         {SDIO_DEVICE(MANUFACTURER_CODE, (MANUFACTURER_ID_AR6003_BASE | 0x1))},
 868         {},
 869 };
 870
 871 MODULE_DEVICE_TABLE(sdio, ath6kl_sdio_devices);
 872
 873 static struct sdio_driver ath6kl_sdio_driver = {
 874         .name = "ath6kl_sdio",
 875         .id_table = ath6kl_sdio_devices,
 876         .probe = ath6kl_sdio_probe,
 877         .remove = ath6kl_sdio_remove,
 878 };
 879
 880 static int __init ath6kl_sdio_init(void)
 881 {
 882         int ret;
 883
 884         ret = sdio_register_driver(&ath6kl_sdio_driver);
 885         if (ret)
 886                 ath6kl_err("sdio driver registration failed: %d\n", ret);
 887
 888         return ret;
 889 }
 890
 891 static void __exit ath6kl_sdio_exit(void)
 892 {
 893         sdio_unregister_driver(&ath6kl_sdio_driver);
 894 }
 895
 896 module_init(ath6kl_sdio_init);
 897 module_exit(ath6kl_sdio_exit);
 898
 899 MODULE_AUTHOR("Atheros Communications, Inc.");
 900 MODULE_DESCRIPTION("Driver support for Atheros AR600x SDIO devices");
 901 MODULE_LICENSE("Dual BSD/GPL");
 902
 903 MODULE_FIRMWARE(AR6003_REV2_OTP_FILE);
 904 MODULE_FIRMWARE(AR6003_REV2_FIRMWARE_FILE);
 905 MODULE_FIRMWARE(AR6003_REV2_PATCH_FILE);
 906 MODULE_FIRMWARE(AR6003_REV2_BOARD_DATA_FILE);
 907 MODULE_FIRMWARE(AR6003_REV2_DEFAULT_BOARD_DATA_FILE);
 908 MODULE_FIRMWARE(AR6003_REV3_OTP_FILE);
 909 MODULE_FIRMWARE(AR6003_REV3_FIRMWARE_FILE);
 910 MODULE_FIRMWARE(AR6003_REV3_PATCH_FILE);
 911 MODULE_FIRMWARE(AR6003_REV3_BOARD_DATA_FILE);
 912 MODULE_FIRMWARE(AR6003_REV3_DEFAULT_BOARD_DATA_FILE);