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                 ath6kl_dbg(ATH6KL_DBG_SCATTER, "%d: addr:0x%p, len:%d\n",
 217                            i, scat_req->scat_list[i].buf,
 218                            scat_req->scat_list[i].len);
 219
 220                 sg_set_buf(sg, scat_req->scat_list[i].buf,
 221                            scat_req->scat_list[i].len);
 222         }
 223
 224         /* set scatter-gather table for request */
 225         data->sg = scat_req->sgentries;
 226         data->sg_len = scat_req->scat_entries;
 227 }
 228
 229 static int ath6kl_sdio_scat_rw(struct ath6kl_sdio *ar_sdio,
 230                                struct bus_request *req)
 231 {
 232         struct mmc_request mmc_req;
 233         struct mmc_command cmd;
 234         struct mmc_data data;
 235         struct hif_scatter_req *scat_req;
 236         u8 opcode, rw;
 237         int status, len;
 238
 239         scat_req = req->scat_req;
 240
 241         if (scat_req->virt_scat) {
 242                 len = scat_req->len;
 243                 if (scat_req->req & HIF_BLOCK_BASIS)
 244                         len = round_down(len, HIF_MBOX_BLOCK_SIZE);
 245
 246                 status = ath6kl_sdio_io(ar_sdio->func, scat_req->req,
 247                                         scat_req->addr, scat_req->virt_dma_buf,
 248                                         len);
 249                 goto scat_complete;
 250         }
 251
 252         memset(&mmc_req, 0, sizeof(struct mmc_request));
 253         memset(&cmd, 0, sizeof(struct mmc_command));
 254         memset(&data, 0, sizeof(struct mmc_data));
 255
 256         ath6kl_sdio_setup_scat_data(scat_req, &data);
 257
 258         opcode = (scat_req->req & HIF_FIXED_ADDRESS) ?
 259                   CMD53_ARG_FIXED_ADDRESS : CMD53_ARG_INCR_ADDRESS;
 260
 261         rw = (scat_req->req & HIF_WRITE) ? CMD53_ARG_WRITE : CMD53_ARG_READ;
 262
 263         /* Fixup the address so that the last byte will fall on MBOX EOM */
 264         if (scat_req->req & HIF_WRITE) {
 265                 if (scat_req->addr == HIF_MBOX_BASE_ADDR)
 266                         scat_req->addr += HIF_MBOX_WIDTH - scat_req->len;
 267                 else
 268                         /* Uses extended address range */
 269                         scat_req->addr += HIF_MBOX0_EXT_WIDTH - scat_req->len;
 270         }
 271
 272         /* set command argument */
 273         ath6kl_sdio_set_cmd53_arg(&cmd.arg, rw, ar_sdio->func->num,
 274                                   CMD53_ARG_BLOCK_BASIS, opcode, scat_req->addr,
 275                                   data.blocks);
 276
 277         cmd.opcode = SD_IO_RW_EXTENDED;
 278         cmd.flags = MMC_RSP_SPI_R5 | MMC_RSP_R5 | MMC_CMD_ADTC;
 279
 280         mmc_req.cmd = &cmd;
 281         mmc_req.data = &data;
 282
 283         mmc_set_data_timeout(&data, ar_sdio->func->card);
 284         /* synchronous call to process request */
 285         mmc_wait_for_req(ar_sdio->func->card->host, &mmc_req);
 286
 287         status = cmd.error ? cmd.error : data.error;
 288
 289 scat_complete:
 290         scat_req->status = status;
 291
 292         if (scat_req->status)
 293                 ath6kl_err("Scatter write request failed:%d\n",
 294                            scat_req->status);
 295
 296         if (scat_req->req & HIF_ASYNCHRONOUS)
 297                 scat_req->complete(ar_sdio->ar->htc_target, scat_req);
 298
 299         return status;
 300 }
 301
 302 static int ath6kl_sdio_alloc_prep_scat_req(struct ath6kl_sdio *ar_sdio,
 303                                            int n_scat_entry, int n_scat_req,
 304                                            bool virt_scat)
 305 {
 306         struct hif_scatter_req *s_req;
 307         struct bus_request *bus_req;
 308         int i, scat_req_sz, scat_list_sz, sg_sz, buf_sz;
 309         u8 *virt_buf;
 310
 311         scat_list_sz = (n_scat_entry - 1) * sizeof(struct hif_scatter_item);
 312         scat_req_sz = sizeof(*s_req) + scat_list_sz;
 313
 314         if (!virt_scat)
 315                 sg_sz = sizeof(struct scatterlist) * n_scat_entry;
 316         else
 317                 buf_sz =  2 * L1_CACHE_BYTES +
 318                           ATH6KL_MAX_TRANSFER_SIZE_PER_SCATTER;
 319
 320         for (i = 0; i < n_scat_req; i++) {
 321                 /* allocate the scatter request */
 322                 s_req = kzalloc(scat_req_sz, GFP_KERNEL);
 323                 if (!s_req)
 324                         return -ENOMEM;
 325
 326                 if (virt_scat) {
 327                         virt_buf = kzalloc(buf_sz, GFP_KERNEL);
 328                         if (!virt_buf) {
 329                                 kfree(s_req);
 330                                 return -ENOMEM;
 331                         }
 332
 333                         s_req->virt_dma_buf =
 334                                 (u8 *)L1_CACHE_ALIGN((unsigned long)virt_buf);
 335                 } else {
 336                         /* allocate sglist */
 337                         s_req->sgentries = kzalloc(sg_sz, GFP_KERNEL);
 338
 339                         if (!s_req->sgentries) {
 340                                 kfree(s_req);
 341                                 return -ENOMEM;
 342                         }
 343                 }
 344
 345                 /* allocate a bus request for this scatter request */
 346                 bus_req = ath6kl_sdio_alloc_busreq(ar_sdio);
 347                 if (!bus_req) {
 348                         kfree(s_req->sgentries);
 349                         kfree(s_req->virt_dma_buf);
 350                         kfree(s_req);
 351                         return -ENOMEM;
 352                 }
 353
 354                 /* assign the scatter request to this bus request */
 355                 bus_req->scat_req = s_req;
 356                 s_req->busrequest = bus_req;
 357
 358                 s_req->virt_scat = virt_scat;
 359
 360                 /* add it to the scatter pool */
 361                 hif_scatter_req_add(ar_sdio->ar, s_req);
 362         }
 363
 364         return 0;
 365 }
 366
 367 static int ath6kl_sdio_read_write_sync(struct ath6kl *ar, u32 addr, u8 *buf,
 368                                        u32 len, u32 request)
 369 {
 370         struct ath6kl_sdio *ar_sdio = ath6kl_sdio_priv(ar);
 371         u8  *tbuf = NULL;
 372         int ret;
 373         bool bounced = false;
 374
 375         if (request & HIF_BLOCK_BASIS)
 376                 len = round_down(len, HIF_MBOX_BLOCK_SIZE);
 377
 378         if (buf_needs_bounce(buf)) {
 379                 if (!ar_sdio->dma_buffer)
 380                         return -ENOMEM;
 381                 tbuf = ar_sdio->dma_buffer;
 382                 memcpy(tbuf, buf, len);
 383                 bounced = true;
 384         } else
 385                 tbuf = buf;
 386
 387         sdio_claim_host(ar_sdio->func);
 388         ret = ath6kl_sdio_io(ar_sdio->func, request, addr, tbuf, len);
 389         if ((request & HIF_READ) && bounced)
 390                 memcpy(buf, tbuf, len);
 391         sdio_release_host(ar_sdio->func);
 392
 393         return ret;
 394 }
 395
 396 static void __ath6kl_sdio_write_async(struct ath6kl_sdio *ar_sdio,
 397                                       struct bus_request *req)
 398 {
 399         if (req->scat_req)
 400                 ath6kl_sdio_scat_rw(ar_sdio, req);
 401         else {
 402                 void *context;
 403                 int status;
 404
 405                 status = ath6kl_sdio_read_write_sync(ar_sdio->ar, req->address,
 406                                                      req->buffer, req->length,
 407                                                      req->request);
 408                 context = req->packet;
 409                 ath6kl_sdio_free_bus_req(ar_sdio, req);
 410                 ath6kldev_rw_comp_handler(context, status);
 411         }
 412 }
 413
 414 static void ath6kl_sdio_write_async_work(struct work_struct *work)
 415 {
 416         struct ath6kl_sdio *ar_sdio;
 417         unsigned long flags;
 418         struct bus_request *req, *tmp_req;
 419
 420         ar_sdio = container_of(work, struct ath6kl_sdio, wr_async_work);
 421         sdio_claim_host(ar_sdio->func);
 422
 423         spin_lock_irqsave(&ar_sdio->wr_async_lock, flags);
 424         list_for_each_entry_safe(req, tmp_req, &ar_sdio->wr_asyncq, list) {
 425                 list_del(&req->list);
 426                 spin_unlock_irqrestore(&ar_sdio->wr_async_lock, flags);
 427                 __ath6kl_sdio_write_async(ar_sdio, req);
 428                 spin_lock_irqsave(&ar_sdio->wr_async_lock, flags);
 429         }
 430         spin_unlock_irqrestore(&ar_sdio->wr_async_lock, flags);
 431
 432         sdio_release_host(ar_sdio->func);
 433 }
 434
 435 static void ath6kl_sdio_irq_handler(struct sdio_func *func)
 436 {
 437         int status;
 438         struct ath6kl_sdio *ar_sdio;
 439
 440         ar_sdio = sdio_get_drvdata(func);
 441         atomic_set(&ar_sdio->irq_handling, 1);
 442
 443         /*
 444          * Release the host during interrups so we can pick it back up when
 445          * we process commands.
 446          */
 447         sdio_release_host(ar_sdio->func);
 448
 449         status = ath6kldev_intr_bh_handler(ar_sdio->ar);
 450         sdio_claim_host(ar_sdio->func);
 451         atomic_set(&ar_sdio->irq_handling, 0);
 452         WARN_ON(status && status != -ECANCELED);
 453 }
 454
 455 static int ath6kl_sdio_power_on(struct ath6kl_sdio *ar_sdio)
 456 {
 457         struct sdio_func *func = ar_sdio->func;
 458         int ret = 0;
 459
 460         if (!ar_sdio->is_disabled)
 461                 return 0;
 462
 463         sdio_claim_host(func);
 464
 465         ret = sdio_enable_func(func);
 466         if (ret) {
 467                 ath6kl_err("Unable to enable sdio func: %d)\n", ret);
 468                 sdio_release_host(func);
 469                 return ret;
 470         }
 471
 472         sdio_release_host(func);
 473
 474         /*
 475          * Wait for hardware to initialise. It should take a lot less than
 476          * 10 ms but let's be conservative here.
 477          */
 478         msleep(10);
 479
 480         ar_sdio->is_disabled = false;
 481
 482         return ret;
 483 }
 484
 485 static int ath6kl_sdio_power_off(struct ath6kl_sdio *ar_sdio)
 486 {
 487         int ret;
 488
 489         if (ar_sdio->is_disabled)
 490                 return 0;
 491
 492         /* Disable the card */
 493         sdio_claim_host(ar_sdio->func);
 494         ret = sdio_disable_func(ar_sdio->func);
 495         sdio_release_host(ar_sdio->func);
 496
 497         if (ret)
 498                 return ret;
 499
 500         ar_sdio->is_disabled = true;
 501
 502         return ret;
 503 }
 504
 505 static int ath6kl_sdio_write_async(struct ath6kl *ar, u32 address, u8 *buffer,
 506                                    u32 length, u32 request,
 507                                    struct htc_packet *packet)
 508 {
 509         struct ath6kl_sdio *ar_sdio = ath6kl_sdio_priv(ar);
 510         struct bus_request *bus_req;
 511         unsigned long flags;
 512
 513         bus_req = ath6kl_sdio_alloc_busreq(ar_sdio);
 514
 515         if (!bus_req)
 516                 return -ENOMEM;
 517
 518         bus_req->address = address;
 519         bus_req->buffer = buffer;
 520         bus_req->length = length;
 521         bus_req->request = request;
 522         bus_req->packet = packet;
 523
 524         spin_lock_irqsave(&ar_sdio->wr_async_lock, flags);
 525         list_add_tail(&bus_req->list, &ar_sdio->wr_asyncq);
 526         spin_unlock_irqrestore(&ar_sdio->wr_async_lock, flags);
 527         queue_work(ar->ath6kl_wq, &ar_sdio->wr_async_work);
 528
 529         return 0;
 530 }
 531
 532 static void ath6kl_sdio_irq_enable(struct ath6kl *ar)
 533 {
 534         struct ath6kl_sdio *ar_sdio = ath6kl_sdio_priv(ar);
 535         int ret;
 536
 537         sdio_claim_host(ar_sdio->func);
 538
 539         /* Register the isr */
 540         ret =  sdio_claim_irq(ar_sdio->func, ath6kl_sdio_irq_handler);
 541         if (ret)
 542                 ath6kl_err("Failed to claim sdio irq: %d\n", ret);
 543
 544         sdio_release_host(ar_sdio->func);
 545 }
 546
 547 static void ath6kl_sdio_irq_disable(struct ath6kl *ar)
 548 {
 549         struct ath6kl_sdio *ar_sdio = ath6kl_sdio_priv(ar);
 550         int ret;
 551
 552         sdio_claim_host(ar_sdio->func);
 553
 554         /* Mask our function IRQ */
 555         while (atomic_read(&ar_sdio->irq_handling)) {
 556                 sdio_release_host(ar_sdio->func);
 557                 schedule_timeout(HZ / 10);
 558                 sdio_claim_host(ar_sdio->func);
 559         }
 560
 561         ret = sdio_release_irq(ar_sdio->func);
 562         if (ret)
 563                 ath6kl_err("Failed to release sdio irq: %d\n", ret);
 564
 565         sdio_release_host(ar_sdio->func);
 566 }
 567
 568 static struct hif_scatter_req *ath6kl_sdio_scatter_req_get(struct ath6kl *ar)
 569 {
 570         struct ath6kl_sdio *ar_sdio = ath6kl_sdio_priv(ar);
 571         struct hif_scatter_req *node = NULL;
 572         unsigned long flag;
 573
 574         spin_lock_irqsave(&ar_sdio->scat_lock, flag);
 575
 576         if (!list_empty(&ar_sdio->scat_req)) {
 577                 node = list_first_entry(&ar_sdio->scat_req,
 578                                         struct hif_scatter_req, list);
 579                 list_del(&node->list);
 580         }
 581
 582         spin_unlock_irqrestore(&ar_sdio->scat_lock, flag);
 583
 584         return node;
 585 }
 586
 587 static void ath6kl_sdio_scatter_req_add(struct ath6kl *ar,
 588                                         struct hif_scatter_req *s_req)
 589 {
 590         struct ath6kl_sdio *ar_sdio = ath6kl_sdio_priv(ar);
 591         unsigned long flag;
 592
 593         spin_lock_irqsave(&ar_sdio->scat_lock, flag);
 594
 595         list_add_tail(&s_req->list, &ar_sdio->scat_req);
 596
 597         spin_unlock_irqrestore(&ar_sdio->scat_lock, flag);
 598
 599 }
 600
 601 /* scatter gather read write request */
 602 static int ath6kl_sdio_async_rw_scatter(struct ath6kl *ar,
 603                                         struct hif_scatter_req *scat_req)
 604 {
 605         struct ath6kl_sdio *ar_sdio = ath6kl_sdio_priv(ar);
 606         u32 request = scat_req->req;
 607         int status = 0;
 608         unsigned long flags;
 609
 610         if (!scat_req->len)
 611                 return -EINVAL;
 612
 613         ath6kl_dbg(ATH6KL_DBG_SCATTER,
 614                 "hif-scatter: total len: %d scatter entries: %d\n",
 615                 scat_req->len, scat_req->scat_entries);
 616
 617         if (request & HIF_SYNCHRONOUS) {
 618                 sdio_claim_host(ar_sdio->func);
 619                 status = ath6kl_sdio_scat_rw(ar_sdio, scat_req->busrequest);
 620                 sdio_release_host(ar_sdio->func);
 621         } else {
 622                 spin_lock_irqsave(&ar_sdio->wr_async_lock, flags);
 623                 list_add_tail(&scat_req->busrequest->list, &ar_sdio->wr_asyncq);
 624                 spin_unlock_irqrestore(&ar_sdio->wr_async_lock, flags);
 625                 queue_work(ar->ath6kl_wq, &ar_sdio->wr_async_work);
 626         }
 627
 628         return status;
 629 }
 630
 631 /* clean up scatter support */
 632 static void ath6kl_sdio_cleanup_scatter(struct ath6kl *ar)
 633 {
 634         struct ath6kl_sdio *ar_sdio = ath6kl_sdio_priv(ar);
 635         struct hif_scatter_req *s_req, *tmp_req;
 636         unsigned long flag;
 637
 638         /* empty the free list */
 639         spin_lock_irqsave(&ar_sdio->scat_lock, flag);
 640         list_for_each_entry_safe(s_req, tmp_req, &ar_sdio->scat_req, list) {
 641                 list_del(&s_req->list);
 642                 spin_unlock_irqrestore(&ar_sdio->scat_lock, flag);
 643
 644                 if (s_req->busrequest)
 645                         ath6kl_sdio_free_bus_req(ar_sdio, s_req->busrequest);
 646                 kfree(s_req->virt_dma_buf);
 647                 kfree(s_req->sgentries);
 648                 kfree(s_req);
 649
 650                 spin_lock_irqsave(&ar_sdio->scat_lock, flag);
 651         }
 652         spin_unlock_irqrestore(&ar_sdio->scat_lock, flag);
 653 }
 654
 655 /* setup of HIF scatter resources */
 656 static int ath6kl_sdio_enable_scatter(struct ath6kl *ar)
 657 {
 658         struct ath6kl_sdio *ar_sdio = ath6kl_sdio_priv(ar);
 659         struct htc_target *target = ar->htc_target;
 660         int ret;
 661         bool virt_scat = false;
 662
 663         /* check if host supports scatter and it meets our requirements */
 664         if (ar_sdio->func->card->host->max_segs < MAX_SCATTER_ENTRIES_PER_REQ) {
 665                 ath6kl_err("host only supports scatter of :%d entries, need: %d\n",
 666                            ar_sdio->func->card->host->max_segs,
 667                            MAX_SCATTER_ENTRIES_PER_REQ);
 668                 virt_scat = true;
 669         }
 670
 671         if (!virt_scat) {
 672                 ret = ath6kl_sdio_alloc_prep_scat_req(ar_sdio,
 673                                 MAX_SCATTER_ENTRIES_PER_REQ,
 674                                 MAX_SCATTER_REQUESTS, virt_scat);
 675
 676                 if (!ret) {
 677                         ath6kl_dbg(ATH6KL_DBG_ANY,
 678                                    "hif-scatter enabled: max scatter req : %d entries: %d\n",
 679                                    MAX_SCATTER_REQUESTS,
 680                                    MAX_SCATTER_ENTRIES_PER_REQ);
 681
 682                         target->max_scat_entries = MAX_SCATTER_ENTRIES_PER_REQ;
 683                         target->max_xfer_szper_scatreq =
 684                                                 MAX_SCATTER_REQ_TRANSFER_SIZE;
 685                 } else {
 686                         ath6kl_sdio_cleanup_scatter(ar);
 687                         ath6kl_warn("hif scatter resource setup failed, trying virtual scatter method\n");
 688                 }
 689         }
 690
 691         if (virt_scat || ret) {
 692                 ret = ath6kl_sdio_alloc_prep_scat_req(ar_sdio,
 693                                 ATH6KL_SCATTER_ENTRIES_PER_REQ,
 694                                 ATH6KL_SCATTER_REQS, virt_scat);
 695
 696                 if (ret) {
 697                         ath6kl_err("failed to alloc virtual scatter resources !\n");
 698                         ath6kl_sdio_cleanup_scatter(ar);
 699                         return ret;
 700                 }
 701
 702                 ath6kl_dbg(ATH6KL_DBG_ANY,
 703                            "Vitual scatter enabled, max_scat_req:%d, entries:%d\n",
 704                            ATH6KL_SCATTER_REQS, ATH6KL_SCATTER_ENTRIES_PER_REQ);
 705
 706                 target->max_scat_entries = ATH6KL_SCATTER_ENTRIES_PER_REQ;
 707                 target->max_xfer_szper_scatreq =
 708                                         ATH6KL_MAX_TRANSFER_SIZE_PER_SCATTER;
 709         }
 710
 711         return 0;
 712 }
 713
 714 static int ath6kl_sdio_suspend(struct ath6kl *ar)
 715 {
 716         struct ath6kl_sdio *ar_sdio = ath6kl_sdio_priv(ar);
 717         struct sdio_func *func = ar_sdio->func;
 718         mmc_pm_flag_t flags;
 719         int ret;
 720
 721         flags = sdio_get_host_pm_caps(func);
 722
 723         if (!(flags & MMC_PM_KEEP_POWER))
 724                 /* as host doesn't support keep power we need to bail out */
 725                 return -EINVAL;
 726
 727         ret = sdio_set_host_pm_flags(func, MMC_PM_KEEP_POWER);
 728         if (ret) {
 729                 printk(KERN_ERR "ath6kl: set sdio pm flags failed: %d\n",
 730                        ret);
 731                 return ret;
 732         }
 733
 734         ath6kl_deep_sleep_enable(ar);
 735
 736         return 0;
 737 }
 738
 739 static const struct ath6kl_hif_ops ath6kl_sdio_ops = {
 740         .read_write_sync = ath6kl_sdio_read_write_sync,
 741         .write_async = ath6kl_sdio_write_async,
 742         .irq_enable = ath6kl_sdio_irq_enable,
 743         .irq_disable = ath6kl_sdio_irq_disable,
 744         .scatter_req_get = ath6kl_sdio_scatter_req_get,
 745         .scatter_req_add = ath6kl_sdio_scatter_req_add,
 746         .enable_scatter = ath6kl_sdio_enable_scatter,
 747         .scat_req_rw = ath6kl_sdio_async_rw_scatter,
 748         .cleanup_scatter = ath6kl_sdio_cleanup_scatter,
 749         .suspend = ath6kl_sdio_suspend,
 750 };
 751
 752 static int ath6kl_sdio_probe(struct sdio_func *func,
 753                              const struct sdio_device_id *id)
 754 {
 755         int ret;
 756         struct ath6kl_sdio *ar_sdio;
 757         struct ath6kl *ar;
 758         int count;
 759
 760         ath6kl_dbg(ATH6KL_DBG_TRC,
 761                    "%s: func: 0x%X, vendor id: 0x%X, dev id: 0x%X, block size: 0x%X/0x%X\n",
 762                    __func__, func->num, func->vendor,
 763                    func->device, func->max_blksize, func->cur_blksize);
 764
 765         ar_sdio = kzalloc(sizeof(struct ath6kl_sdio), GFP_KERNEL);
 766         if (!ar_sdio)
 767                 return -ENOMEM;
 768
 769         ar_sdio->dma_buffer = kzalloc(HIF_DMA_BUFFER_SIZE, GFP_KERNEL);
 770         if (!ar_sdio->dma_buffer) {
 771                 ret = -ENOMEM;
 772                 goto err_hif;
 773         }
 774
 775         ar_sdio->func = func;
 776         sdio_set_drvdata(func, ar_sdio);
 777
 778         ar_sdio->id = id;
 779         ar_sdio->is_disabled = true;
 780
 781         spin_lock_init(&ar_sdio->lock);
 782         spin_lock_init(&ar_sdio->scat_lock);
 783         spin_lock_init(&ar_sdio->wr_async_lock);
 784
 785         INIT_LIST_HEAD(&ar_sdio->scat_req);
 786         INIT_LIST_HEAD(&ar_sdio->bus_req_freeq);
 787         INIT_LIST_HEAD(&ar_sdio->wr_asyncq);
 788
 789         INIT_WORK(&ar_sdio->wr_async_work, ath6kl_sdio_write_async_work);
 790
 791         for (count = 0; count < BUS_REQUEST_MAX_NUM; count++)
 792                 ath6kl_sdio_free_bus_req(ar_sdio, &ar_sdio->bus_req[count]);
 793
 794         ar = ath6kl_core_alloc(&ar_sdio->func->dev);
 795         if (!ar) {
 796                 ath6kl_err("Failed to alloc ath6kl core\n");
 797                 ret = -ENOMEM;
 798                 goto err_dma;
 799         }
 800
 801         ar_sdio->ar = ar;
 802         ar->hif_priv = ar_sdio;
 803         ar->hif_ops = &ath6kl_sdio_ops;
 804
 805         ath6kl_sdio_set_mbox_info(ar);
 806
 807         sdio_claim_host(func);
 808
 809         if ((ar_sdio->id->device & MANUFACTURER_ID_ATH6KL_BASE_MASK) >=
 810             MANUFACTURER_ID_AR6003_BASE) {
 811                 /* enable 4-bit ASYNC interrupt on AR6003 or later */
 812                 ret = ath6kl_sdio_func0_cmd52_wr_byte(func->card,
 813                                                 CCCR_SDIO_IRQ_MODE_REG,
 814                                                 SDIO_IRQ_MODE_ASYNC_4BIT_IRQ);
 815                 if (ret) {
 816                         ath6kl_err("Failed to enable 4-bit async irq mode %d\n",
 817                                    ret);
 818                         sdio_release_host(func);
 819                         goto err_dma;
 820                 }
 821
 822                 ath6kl_dbg(ATH6KL_DBG_TRC, "4-bit async irq mode enabled\n");
 823         }
 824
 825         /* give us some time to enable, in ms */
 826         func->enable_timeout = 100;
 827
 828         sdio_release_host(func);
 829
 830         ret = ath6kl_sdio_power_on(ar_sdio);
 831         if (ret)
 832                 goto err_dma;
 833
 834         sdio_claim_host(func);
 835
 836         ret = sdio_set_block_size(func, HIF_MBOX_BLOCK_SIZE);
 837         if (ret) {
 838                 ath6kl_err("Set sdio block size %d failed: %d)\n",
 839                            HIF_MBOX_BLOCK_SIZE, ret);
 840                 sdio_release_host(func);
 841                 goto err_off;
 842         }
 843
 844         sdio_release_host(func);
 845
 846         ret = ath6kl_core_init(ar);
 847         if (ret) {
 848                 ath6kl_err("Failed to init ath6kl core\n");
 849                 goto err_off;
 850         }
 851
 852         return ret;
 853
 854 err_off:
 855         ath6kl_sdio_power_off(ar_sdio);
 856 err_dma:
 857         kfree(ar_sdio->dma_buffer);
 858 err_hif:
 859         kfree(ar_sdio);
 860
 861         return ret;
 862 }
 863
 864 static void ath6kl_sdio_remove(struct sdio_func *func)
 865 {
 866         struct ath6kl_sdio *ar_sdio;
 867
 868         ar_sdio = sdio_get_drvdata(func);
 869
 870         ath6kl_stop_txrx(ar_sdio->ar);
 871         cancel_work_sync(&ar_sdio->wr_async_work);
 872
 873         ath6kl_unavail_ev(ar_sdio->ar);
 874
 875         ath6kl_sdio_power_off(ar_sdio);
 876
 877         kfree(ar_sdio->dma_buffer);
 878         kfree(ar_sdio);
 879 }
 880
 881 static const struct sdio_device_id ath6kl_sdio_devices[] = {
 882         {SDIO_DEVICE(MANUFACTURER_CODE, (MANUFACTURER_ID_AR6003_BASE | 0x0))},
 883         {SDIO_DEVICE(MANUFACTURER_CODE, (MANUFACTURER_ID_AR6003_BASE | 0x1))},
 884         {},
 885 };
 886
 887 MODULE_DEVICE_TABLE(sdio, ath6kl_sdio_devices);
 888
 889 static struct sdio_driver ath6kl_sdio_driver = {
 890         .name = "ath6kl_sdio",
 891         .id_table = ath6kl_sdio_devices,
 892         .probe = ath6kl_sdio_probe,
 893         .remove = ath6kl_sdio_remove,
 894 };
 895
 896 static int __init ath6kl_sdio_init(void)
 897 {
 898         int ret;
 899
 900         ret = sdio_register_driver(&ath6kl_sdio_driver);
 901         if (ret)
 902                 ath6kl_err("sdio driver registration failed: %d\n", ret);
 903
 904         return ret;
 905 }
 906
 907 static void __exit ath6kl_sdio_exit(void)
 908 {
 909         sdio_unregister_driver(&ath6kl_sdio_driver);
 910 }
 911
 912 module_init(ath6kl_sdio_init);
 913 module_exit(ath6kl_sdio_exit);
 914
 915 MODULE_AUTHOR("Atheros Communications, Inc.");
 916 MODULE_DESCRIPTION("Driver support for Atheros AR600x SDIO devices");
 917 MODULE_LICENSE("Dual BSD/GPL");
 918
 919 MODULE_FIRMWARE(AR6003_REV2_OTP_FILE);
 920 MODULE_FIRMWARE(AR6003_REV2_FIRMWARE_FILE);
 921 MODULE_FIRMWARE(AR6003_REV2_PATCH_FILE);
 922 MODULE_FIRMWARE(AR6003_REV2_BOARD_DATA_FILE);
 923 MODULE_FIRMWARE(AR6003_REV2_DEFAULT_BOARD_DATA_FILE);
 924 MODULE_FIRMWARE(AR6003_REV3_OTP_FILE);
 925 MODULE_FIRMWARE(AR6003_REV3_FIRMWARE_FILE);
 926 MODULE_FIRMWARE(AR6003_REV3_PATCH_FILE);
 927 MODULE_FIRMWARE(AR6003_REV3_BOARD_DATA_FILE);
 928 MODULE_FIRMWARE(AR6003_REV3_DEFAULT_BOARD_DATA_FILE);