drivers/staging/ath6kl/hif/sdio/linux_sdio/src/hif_scatter.c

   1 //------------------------------------------------------------------------------
   2 // Copyright (c) 2009-2010 Atheros Corporation.  All rights reserved.
   3 //
   4 //
   5 // Permission to use, copy, modify, and/or distribute this software for any
   6 // purpose with or without fee is hereby granted, provided that the above
   7 // copyright notice and this permission notice appear in all copies.
   8 //
   9 // THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  10 // WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  11 // MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  12 // ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  13 // WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  14 // ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  15 // OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  16 //
  17 //
  18 //------------------------------------------------------------------------------
  19 //==============================================================================
  20 // HIF scatter implementation
  21 //
  22 // Author(s): ="Atheros"
  23 //==============================================================================
  24
  25 #include <linux/mmc/card.h>
  26 #include <linux/mmc/host.h>
  27 #include <linux/mmc/sdio_func.h>
  28 #include <linux/mmc/sdio_ids.h>
  29 #include <linux/mmc/sdio.h>
  30 #include <linux/kthread.h>
  31 #include "hif_internal.h"
  32 #define ATH_MODULE_NAME hif
  33 #include "a_debug.h"
  34
  35 #ifdef HIF_LINUX_MMC_SCATTER_SUPPORT
  36
  37 #define _CMD53_ARG_READ          0
  38 #define _CMD53_ARG_WRITE         1
  39 #define _CMD53_ARG_BLOCK_BASIS   1
  40 #define _CMD53_ARG_FIXED_ADDRESS 0
  41 #define _CMD53_ARG_INCR_ADDRESS  1
  42
  43 #define SDIO_SET_CMD53_ARG(arg,rw,func,mode,opcode,address,bytes_blocks) \
  44     (arg) = (((rw) & 1) << 31)                  | \
  45             (((func) & 0x7) << 28)              | \
  46             (((mode) & 1) << 27)                | \
  47             (((opcode) & 1) << 26)              | \
  48             (((address) & 0x1FFFF) << 9)        | \
  49             ((bytes_blocks) & 0x1FF)
  50
  51 static void FreeScatterReq(HIF_DEVICE *device, HIF_SCATTER_REQ *pReq)
  52 {
  53     unsigned long flag;
  54
  55     spin_lock_irqsave(&device->lock, flag);
  56
  57     DL_ListInsertTail(&device->ScatterReqHead, &pReq->ListLink);
  58
  59     spin_unlock_irqrestore(&device->lock, flag);
  60
  61 }
  62
  63 static HIF_SCATTER_REQ *AllocScatterReq(HIF_DEVICE *device)
  64 {
  65     DL_LIST       *pItem;
  66     unsigned long flag;
  67
  68     spin_lock_irqsave(&device->lock, flag);
  69
  70     pItem = DL_ListRemoveItemFromHead(&device->ScatterReqHead);
  71
  72     spin_unlock_irqrestore(&device->lock, flag);
  73
  74     if (pItem != NULL) {
  75         return A_CONTAINING_STRUCT(pItem, HIF_SCATTER_REQ, ListLink);
  76     }
  77
  78     return NULL;
  79 }
  80
  81     /* called by async task to perform the operation synchronously using direct MMC APIs  */
  82 A_STATUS DoHifReadWriteScatter(HIF_DEVICE *device, BUS_REQUEST *busrequest)
  83 {
  84     int                     i;
  85     A_UINT8                 rw;
  86     A_UINT8                 opcode;
  87     struct mmc_request      mmcreq;
  88     struct mmc_command      cmd;
  89     struct mmc_data         data;
  90     HIF_SCATTER_REQ_PRIV   *pReqPriv;
  91     HIF_SCATTER_REQ        *pReq;
  92     A_STATUS                status = A_OK;
  93     struct                  scatterlist *pSg;
  94
  95     pReqPriv = busrequest->pScatterReq;
  96
  97     A_ASSERT(pReqPriv != NULL);
  98
  99     pReq = pReqPriv->pHifScatterReq;
 100
 101     memset(&mmcreq, 0, sizeof(struct mmc_request));
 102     memset(&cmd, 0, sizeof(struct mmc_command));
 103     memset(&data, 0, sizeof(struct mmc_data));
 104
 105     data.blksz = HIF_MBOX_BLOCK_SIZE;
 106     data.blocks = pReq->TotalLength / HIF_MBOX_BLOCK_SIZE;
 107
 108     AR_DEBUG_PRINTF(ATH_DEBUG_SCATTER, ("HIF-SCATTER: (%s) Address: 0x%X, (BlockLen: %d, BlockCount: %d) , (tot:%d,sg:%d)\n",
 109               (pReq->Request & HIF_WRITE) ? "WRITE":"READ", pReq->Address, data.blksz, data.blocks,
 110               pReq->TotalLength,pReq->ValidScatterEntries));
 111
 112     if (pReq->Request  & HIF_WRITE) {
 113         rw = _CMD53_ARG_WRITE;
 114         data.flags = MMC_DATA_WRITE;
 115     } else {
 116         rw = _CMD53_ARG_READ;
 117         data.flags = MMC_DATA_READ;
 118     }
 119
 120     if (pReq->Request & HIF_FIXED_ADDRESS) {
 121         opcode = _CMD53_ARG_FIXED_ADDRESS;
 122     } else {
 123         opcode = _CMD53_ARG_INCR_ADDRESS;
 124     }
 125
 126         /* fill SG entries */
 127     pSg = pReqPriv->sgentries;
 128     sg_init_table(pSg, pReq->ValidScatterEntries);
 129
 130         /* assemble SG list */
 131     for (i = 0 ; i < pReq->ValidScatterEntries ; i++, pSg++) {
 132             /* setup each sg entry */
 133         if ((unsigned long)pReq->ScatterList[i].pBuffer & 0x3) {
 134                 /* note some scatter engines can handle unaligned buffers, print this
 135                  * as informational only */
 136             AR_DEBUG_PRINTF(ATH_DEBUG_SCATTER,
 137                             ("HIF: (%s) Scatter Buffer is unaligned 0x%lx\n",
 138                             pReq->Request & HIF_WRITE ? "WRITE":"READ",
 139                             (unsigned long)pReq->ScatterList[i].pBuffer));
 140         }
 141
 142         AR_DEBUG_PRINTF(ATH_DEBUG_SCATTER, ("  %d:  Addr:0x%lX, Len:%d \n",
 143             i,(unsigned long)pReq->ScatterList[i].pBuffer,pReq->ScatterList[i].Length));
 144
 145         sg_set_buf(pSg, pReq->ScatterList[i].pBuffer, pReq->ScatterList[i].Length);
 146     }
 147         /* set scatter-gather table for request */
 148     data.sg = pReqPriv->sgentries;
 149     data.sg_len = pReq->ValidScatterEntries;
 150         /* set command argument */
 151     SDIO_SET_CMD53_ARG(cmd.arg,
 152                        rw,
 153                        device->func->num,
 154                        _CMD53_ARG_BLOCK_BASIS,
 155                        opcode,
 156                        pReq->Address,
 157                        data.blocks);
 158
 159     cmd.opcode = SD_IO_RW_EXTENDED;
 160     cmd.flags = MMC_RSP_SPI_R5 | MMC_RSP_R5 | MMC_CMD_ADTC;
 161
 162     mmcreq.cmd = &cmd;
 163     mmcreq.data = &data;
 164
 165     mmc_set_data_timeout(&data, device->func->card);
 166         /* synchronous call to process request */
 167     mmc_wait_for_req(device->func->card->host, &mmcreq);
 168
 169     if (cmd.error) {
 170         status = A_ERROR;
 171         AR_DEBUG_PRINTF(ATH_DEBUG_ERROR, ("HIF-SCATTER: cmd error: %d \n",cmd.error));
 172     }
 173
 174     if (data.error) {
 175         status = A_ERROR;
 176         AR_DEBUG_PRINTF(ATH_DEBUG_ERROR, ("HIF-SCATTER: data error: %d \n",data.error));
 177     }
 178
 179     if (A_FAILED(status)) {
 180         AR_DEBUG_PRINTF(ATH_DEBUG_ERROR, ("HIF-SCATTER: FAILED!!! (%s) Address: 0x%X, Block mode (BlockLen: %d, BlockCount: %d)\n",
 181               (pReq->Request & HIF_WRITE) ? "WRITE":"READ",pReq->Address, data.blksz, data.blocks));
 182     }
 183
 184         /* set completion status, fail or success */
 185     pReq->CompletionStatus = status;
 186
 187     if (pReq->Request & HIF_ASYNCHRONOUS) {
 188         AR_DEBUG_PRINTF(ATH_DEBUG_SCATTER, ("HIF-SCATTER: async_task completion routine req: 0x%lX (%d)\n",(unsigned long)busrequest, status));
 189             /* complete the request */
 190         A_ASSERT(pReq->CompletionRoutine != NULL);
 191         pReq->CompletionRoutine(pReq);
 192     } else {
 193         AR_DEBUG_PRINTF(ATH_DEBUG_SCATTER, ("HIF-SCATTER async_task upping busrequest : 0x%lX (%d)\n", (unsigned long)busrequest,status));
 194             /* signal wait */
 195         up(&busrequest->sem_req);
 196     }
 197
 198     return status;
 199 }
 200
 201     /* callback to issue a read-write scatter request */
 202 static A_STATUS HifReadWriteScatter(HIF_DEVICE *device, HIF_SCATTER_REQ *pReq)
 203 {
 204     A_STATUS             status = A_EINVAL;
 205     A_UINT32             request = pReq->Request;
 206     HIF_SCATTER_REQ_PRIV *pReqPriv = (HIF_SCATTER_REQ_PRIV *)pReq->HIFPrivate[0];
 207
 208     do {
 209
 210         A_ASSERT(pReqPriv != NULL);
 211
 212         AR_DEBUG_PRINTF(ATH_DEBUG_SCATTER, ("HIF-SCATTER: total len: %d Scatter Entries: %d\n",
 213                             pReq->TotalLength, pReq->ValidScatterEntries));
 214
 215         if (!(request & HIF_EXTENDED_IO)) {
 216             AR_DEBUG_PRINTF(ATH_DEBUG_ERROR,
 217                             ("HIF-SCATTER: Invalid command type: 0x%08x\n", request));
 218             break;
 219         }
 220
 221         if (!(request & (HIF_SYNCHRONOUS | HIF_ASYNCHRONOUS))) {
 222             AR_DEBUG_PRINTF(ATH_DEBUG_ERROR,
 223                             ("HIF-SCATTER: Invalid execution mode: 0x%08x\n", request));
 224             break;
 225         }
 226
 227         if (!(request & HIF_BLOCK_BASIS)) {
 228             AR_DEBUG_PRINTF(ATH_DEBUG_ERROR,
 229                             ("HIF-SCATTER: Invalid data mode: 0x%08x\n", request));
 230             break;
 231         }
 232
 233         if (pReq->TotalLength > MAX_SCATTER_REQ_TRANSFER_SIZE) {
 234             AR_DEBUG_PRINTF(ATH_DEBUG_ERROR,
 235                             ("HIF-SCATTER: Invalid length: %d \n", pReq->TotalLength));
 236             break;
 237         }
 238
 239         if (pReq->TotalLength == 0) {
 240             A_ASSERT(FALSE);
 241             break;
 242         }
 243
 244             /* add bus request to the async list for the async I/O thread to process */
 245         AddToAsyncList(device, pReqPriv->busrequest);
 246
 247         if (request & HIF_SYNCHRONOUS) {
 248             AR_DEBUG_PRINTF(ATH_DEBUG_SCATTER, ("HIF-SCATTER: queued sync req: 0x%lX\n", (unsigned long)pReqPriv->busrequest));
 249             /* signal thread and wait */
 250             up(&device->sem_async);
 251             if (down_interruptible(&pReqPriv->busrequest->sem_req) != 0) {
 252                 AR_DEBUG_PRINTF(ATH_DEBUG_ERROR,("HIF-SCATTER: interrupted! \n"));
 253                 /* interrupted, exit */
 254                 status = A_ERROR;
 255                 break;
 256             } else {
 257                 status = pReq->CompletionStatus;
 258             }
 259         } else {
 260             AR_DEBUG_PRINTF(ATH_DEBUG_SCATTER, ("HIF-SCATTER: queued async req: 0x%lX\n", (unsigned long)pReqPriv->busrequest));
 261                 /* wake thread, it will process and then take care of the async callback */
 262             up(&device->sem_async);
 263             status = A_OK;
 264         }
 265
 266     } while (FALSE);
 267
 268     if (A_FAILED(status) && (request & HIF_ASYNCHRONOUS)) {
 269         pReq->CompletionStatus = status;
 270         pReq->CompletionRoutine(pReq);
 271         status = A_OK;
 272     }
 273
 274     return status;
 275 }
 276
 277     /* setup of HIF scatter resources */
 278 A_STATUS SetupHIFScatterSupport(HIF_DEVICE *device, HIF_DEVICE_SCATTER_SUPPORT_INFO *pInfo)
 279 {
 280     A_STATUS              status = A_ERROR;
 281     int                   i;
 282     HIF_SCATTER_REQ_PRIV *pReqPriv;
 283     BUS_REQUEST          *busrequest;
 284
 285     do {
 286
 287             /* check if host supports scatter requests and it meets our requirements */
 288         if (device->func->card->host->max_hw_segs < MAX_SCATTER_ENTRIES_PER_REQ) {
 289             AR_DEBUG_PRINTF(ATH_DEBUG_ERR,("HIF-SCATTER : host only supports scatter of : %d entries, need: %d \n",
 290                     device->func->card->host->max_hw_segs, MAX_SCATTER_ENTRIES_PER_REQ));
 291             status = A_ENOTSUP;
 292             break;
 293         }
 294
 295         AR_DEBUG_PRINTF(ATH_DEBUG_ANY,("HIF-SCATTER Enabled: max scatter req : %d entries: %d \n",
 296                 MAX_SCATTER_REQUESTS, MAX_SCATTER_ENTRIES_PER_REQ));
 297
 298         for (i = 0; i < MAX_SCATTER_REQUESTS; i++) {
 299                 /* allocate the private request blob */
 300             pReqPriv = (HIF_SCATTER_REQ_PRIV *)A_MALLOC(sizeof(HIF_SCATTER_REQ_PRIV));
 301             if (NULL == pReqPriv) {
 302                 break;
 303             }
 304             A_MEMZERO(pReqPriv, sizeof(HIF_SCATTER_REQ_PRIV));
 305                 /* save the device instance*/
 306             pReqPriv->device = device;
 307                 /* allocate the scatter request */
 308             pReqPriv->pHifScatterReq = (HIF_SCATTER_REQ *)A_MALLOC(sizeof(HIF_SCATTER_REQ) +
 309                                          (MAX_SCATTER_ENTRIES_PER_REQ - 1) * (sizeof(HIF_SCATTER_ITEM)));
 310
 311             if (NULL == pReqPriv->pHifScatterReq) {
 312                 A_FREE(pReqPriv);
 313                 break;
 314             }
 315                 /* just zero the main part of the scatter request */
 316             A_MEMZERO(pReqPriv->pHifScatterReq, sizeof(HIF_SCATTER_REQ));
 317                 /* back pointer to the private struct */
 318             pReqPriv->pHifScatterReq->HIFPrivate[0] = pReqPriv;
 319                 /* allocate a bus request for this scatter request */
 320             busrequest = hifAllocateBusRequest(device);
 321             if (NULL == busrequest) {
 322                 A_FREE(pReqPriv->pHifScatterReq);
 323                 A_FREE(pReqPriv);
 324                 break;
 325             }
 326                 /* assign the scatter request to this bus request */
 327             busrequest->pScatterReq = pReqPriv;
 328                 /* point back to the request */
 329             pReqPriv->busrequest = busrequest;
 330                 /* add it to the scatter pool */
 331             FreeScatterReq(device,pReqPriv->pHifScatterReq);
 332         }
 333
 334         if (i != MAX_SCATTER_REQUESTS) {
 335             status = A_NO_MEMORY;
 336             AR_DEBUG_PRINTF(ATH_DEBUG_ERR,("HIF-SCATTER : failed to alloc scatter resources !\n"));
 337             break;
 338         }
 339
 340             /* set scatter function pointers */
 341         pInfo->pAllocateReqFunc = AllocScatterReq;
 342         pInfo->pFreeReqFunc = FreeScatterReq;
 343         pInfo->pReadWriteScatterFunc = HifReadWriteScatter;
 344         pInfo->MaxScatterEntries = MAX_SCATTER_ENTRIES_PER_REQ;
 345         pInfo->MaxTransferSizePerScatterReq = MAX_SCATTER_REQ_TRANSFER_SIZE;
 346
 347         status = A_OK;
 348
 349     } while (FALSE);
 350
 351     if (A_FAILED(status)) {
 352         CleanupHIFScatterResources(device);
 353     }
 354
 355     return status;
 356 }
 357
 358     /* clean up scatter support */
 359 void CleanupHIFScatterResources(HIF_DEVICE *device)
 360 {
 361     HIF_SCATTER_REQ_PRIV    *pReqPriv;
 362     HIF_SCATTER_REQ         *pReq;
 363
 364         /* empty the free list */
 365
 366     while (1) {
 367
 368         pReq = AllocScatterReq(device);
 369
 370         if (NULL == pReq) {
 371             break;
 372         }
 373
 374         pReqPriv = (HIF_SCATTER_REQ_PRIV *)pReq->HIFPrivate[0];
 375         A_ASSERT(pReqPriv != NULL);
 376
 377         if (pReqPriv->busrequest != NULL) {
 378             pReqPriv->busrequest->pScatterReq = NULL;
 379                 /* free bus request */
 380             hifFreeBusRequest(device, pReqPriv->busrequest);
 381             pReqPriv->busrequest = NULL;
 382         }
 383
 384         if (pReqPriv->pHifScatterReq != NULL) {
 385             A_FREE(pReqPriv->pHifScatterReq);
 386             pReqPriv->pHifScatterReq = NULL;
 387         }
 388
 389         A_FREE(pReqPriv);
 390     }
 391 }
 392
 393 #endif // HIF_LINUX_MMC_SCATTER_SUPPORT