drivers/staging/ath6kl/htc2/AR6000/ar6k_gmbox.c

   1 //------------------------------------------------------------------------------
   2 // <copyright file="ar6k_gmbox.c" company="Atheros">
   3 //    Copyright (c) 2007-2010 Atheros Corporation.  All rights reserved.
   4 //
   5 //
   6 // Permission to use, copy, modify, and/or distribute this software for any
   7 // purpose with or without fee is hereby granted, provided that the above
   8 // copyright notice and this permission notice appear in all copies.
   9 //
  10 // THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  11 // WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  12 // MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  13 // ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  14 // WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  15 // ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  16 // OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  17 //
  18 //
  19 //------------------------------------------------------------------------------
  20 //==============================================================================
  21 // Generic MBOX API implementation
  22 //
  23 // Author(s): ="Atheros"
  24 //==============================================================================
  25 #include "a_config.h"
  26 #include "athdefs.h"
  27 #include "a_types.h"
  28 #include "a_osapi.h"
  29 #include "../htc_debug.h"
  30 #include "hif.h"
  31 #include "htc_packet.h"
  32 #include "ar6k.h"
  33 #include "hw/mbox_host_reg.h"
  34 #include "gmboxif.h"
  35
  36 /*
  37  * This file provides management functions and a toolbox for GMBOX protocol modules.
  38  * Only one protocol module can be installed at a time. The determination of which protocol
  39  * module is installed is determined at compile time.
  40  *
  41  */
  42 #ifdef ATH_AR6K_ENABLE_GMBOX
  43      /* GMBOX definitions */
  44 #define GMBOX_INT_STATUS_ENABLE_REG     0x488
  45 #define GMBOX_INT_STATUS_RX_DATA        (1 << 0)
  46 #define GMBOX_INT_STATUS_TX_OVERFLOW    (1 << 1)
  47 #define GMBOX_INT_STATUS_RX_OVERFLOW    (1 << 2)
  48
  49 #define GMBOX_LOOKAHEAD_MUX_REG         0x498
  50 #define GMBOX_LA_MUX_OVERRIDE_2_3       (1 << 0)
  51
  52 #define AR6K_GMBOX_CREDIT_DEC_ADDRESS   (COUNT_DEC_ADDRESS + 4 * AR6K_GMBOX_CREDIT_COUNTER)
  53 #define AR6K_GMBOX_CREDIT_SIZE_ADDRESS  (COUNT_ADDRESS     + AR6K_GMBOX_CREDIT_SIZE_COUNTER)
  54
  55
  56     /* external APIs for allocating and freeing internal I/O packets to handle ASYNC I/O */
  57 extern void AR6KFreeIOPacket(AR6K_DEVICE *pDev, HTC_PACKET *pPacket);
  58 extern HTC_PACKET *AR6KAllocIOPacket(AR6K_DEVICE *pDev);
  59
  60
  61 /* callback when our fetch to enable/disable completes */
  62 static void DevGMboxIRQActionAsyncHandler(void *Context, HTC_PACKET *pPacket)
  63 {
  64     AR6K_DEVICE *pDev = (AR6K_DEVICE *)Context;
  65
  66     AR_DEBUG_PRINTF(ATH_DEBUG_IRQ,("+DevGMboxIRQActionAsyncHandler: (dev: 0x%lX)\n", (unsigned long)pDev));
  67
  68     if (A_FAILED(pPacket->Status)) {
  69         AR_DEBUG_PRINTF(ATH_DEBUG_ERR,
  70                 ("IRQAction Operation (%d) failed! status:%d \n", pPacket->PktInfo.AsRx.HTCRxFlags,pPacket->Status));
  71     }
  72         /* free this IO packet */
  73     AR6KFreeIOPacket(pDev,pPacket);
  74     AR_DEBUG_PRINTF(ATH_DEBUG_IRQ,("-DevGMboxIRQActionAsyncHandler \n"));
  75 }
  76
  77 static A_STATUS DevGMboxCounterEnableDisable(AR6K_DEVICE *pDev, GMBOX_IRQ_ACTION_TYPE IrqAction, A_BOOL AsyncMode)
  78 {
  79     A_STATUS                  status = A_OK;
  80     AR6K_IRQ_ENABLE_REGISTERS regs;
  81     HTC_PACKET                *pIOPacket = NULL;
  82
  83     LOCK_AR6K(pDev);
  84
  85     if (GMBOX_CREDIT_IRQ_ENABLE == IrqAction) {
  86         pDev->GMboxInfo.CreditCountIRQEnabled = TRUE;
  87         pDev->IrqEnableRegisters.counter_int_status_enable |=
  88             COUNTER_INT_STATUS_ENABLE_BIT_SET(1 << AR6K_GMBOX_CREDIT_COUNTER);
  89         pDev->IrqEnableRegisters.int_status_enable |= INT_STATUS_ENABLE_COUNTER_SET(0x01);
  90     } else {
  91         pDev->GMboxInfo.CreditCountIRQEnabled = FALSE;
  92         pDev->IrqEnableRegisters.counter_int_status_enable &=
  93             ~(COUNTER_INT_STATUS_ENABLE_BIT_SET(1 << AR6K_GMBOX_CREDIT_COUNTER));
  94     }
  95         /* copy into our temp area */
  96     A_MEMCPY(&regs,&pDev->IrqEnableRegisters,AR6K_IRQ_ENABLE_REGS_SIZE);
  97
  98     UNLOCK_AR6K(pDev);
  99
 100     do {
 101
 102         if (AsyncMode) {
 103
 104             pIOPacket = AR6KAllocIOPacket(pDev);
 105
 106             if (NULL == pIOPacket) {
 107                 status = A_NO_MEMORY;
 108                 A_ASSERT(FALSE);
 109                 break;
 110             }
 111
 112                 /* copy values to write to our async I/O buffer */
 113             A_MEMCPY(pIOPacket->pBuffer,&pDev->IrqEnableRegisters,AR6K_IRQ_ENABLE_REGS_SIZE);
 114
 115                 /* stick in our completion routine when the I/O operation completes */
 116             pIOPacket->Completion = DevGMboxIRQActionAsyncHandler;
 117             pIOPacket->pContext = pDev;
 118             pIOPacket->PktInfo.AsRx.HTCRxFlags = IrqAction;
 119                 /* write it out asynchronously */
 120             HIFReadWrite(pDev->HIFDevice,
 121                          INT_STATUS_ENABLE_ADDRESS,
 122                          pIOPacket->pBuffer,
 123                          AR6K_IRQ_ENABLE_REGS_SIZE,
 124                          HIF_WR_ASYNC_BYTE_INC,
 125                          pIOPacket);
 126
 127             pIOPacket = NULL;
 128             break;
 129         }
 130
 131             /* if we get here we are doing it synchronously */
 132         status = HIFReadWrite(pDev->HIFDevice,
 133                               INT_STATUS_ENABLE_ADDRESS,
 134                               &regs.int_status_enable,
 135                               AR6K_IRQ_ENABLE_REGS_SIZE,
 136                               HIF_WR_SYNC_BYTE_INC,
 137                               NULL);
 138     } while (FALSE);
 139
 140     if (A_FAILED(status)) {
 141         AR_DEBUG_PRINTF(ATH_DEBUG_ERR,
 142                 (" IRQAction Operation (%d) failed! status:%d \n", IrqAction, status));
 143     } else {
 144         if (!AsyncMode) {
 145             AR_DEBUG_PRINTF(ATH_DEBUG_IRQ,
 146                     (" IRQAction Operation (%d) success \n", IrqAction));
 147         }
 148     }
 149
 150     if (pIOPacket != NULL) {
 151         AR6KFreeIOPacket(pDev,pIOPacket);
 152     }
 153
 154     return status;
 155 }
 156
 157
 158 A_STATUS DevGMboxIRQAction(AR6K_DEVICE *pDev, GMBOX_IRQ_ACTION_TYPE IrqAction, A_BOOL AsyncMode)
 159 {
 160     A_STATUS      status = A_OK;
 161     HTC_PACKET    *pIOPacket = NULL;
 162     A_UINT8       GMboxIntControl[4];
 163
 164     if (GMBOX_CREDIT_IRQ_ENABLE == IrqAction) {
 165         return DevGMboxCounterEnableDisable(pDev, GMBOX_CREDIT_IRQ_ENABLE, AsyncMode);
 166     } else if(GMBOX_CREDIT_IRQ_DISABLE == IrqAction) {
 167         return DevGMboxCounterEnableDisable(pDev, GMBOX_CREDIT_IRQ_DISABLE, AsyncMode);
 168     }
 169
 170     if (GMBOX_DISABLE_ALL == IrqAction) {
 171             /* disable credit IRQ, those are on a different set of registers */
 172         DevGMboxCounterEnableDisable(pDev, GMBOX_CREDIT_IRQ_DISABLE, AsyncMode);
 173     }
 174
 175         /* take the lock to protect interrupt enable shadows */
 176     LOCK_AR6K(pDev);
 177
 178     switch (IrqAction) {
 179
 180         case GMBOX_DISABLE_ALL:
 181             pDev->GMboxControlRegisters.int_status_enable = 0;
 182             break;
 183         case GMBOX_ERRORS_IRQ_ENABLE:
 184             pDev->GMboxControlRegisters.int_status_enable |= GMBOX_INT_STATUS_TX_OVERFLOW |
 185                                                              GMBOX_INT_STATUS_RX_OVERFLOW;
 186             break;
 187         case GMBOX_RECV_IRQ_ENABLE:
 188             pDev->GMboxControlRegisters.int_status_enable |= GMBOX_INT_STATUS_RX_DATA;
 189             break;
 190         case GMBOX_RECV_IRQ_DISABLE:
 191             pDev->GMboxControlRegisters.int_status_enable &= ~GMBOX_INT_STATUS_RX_DATA;
 192             break;
 193         case GMBOX_ACTION_NONE:
 194         default:
 195             A_ASSERT(FALSE);
 196             break;
 197     }
 198
 199     GMboxIntControl[0] = pDev->GMboxControlRegisters.int_status_enable;
 200     GMboxIntControl[1] = GMboxIntControl[0];
 201     GMboxIntControl[2] = GMboxIntControl[0];
 202     GMboxIntControl[3] = GMboxIntControl[0];
 203
 204     UNLOCK_AR6K(pDev);
 205
 206     do {
 207
 208         if (AsyncMode) {
 209
 210             pIOPacket = AR6KAllocIOPacket(pDev);
 211
 212             if (NULL == pIOPacket) {
 213                 status = A_NO_MEMORY;
 214                 A_ASSERT(FALSE);
 215                 break;
 216             }
 217
 218                 /* copy values to write to our async I/O buffer */
 219             A_MEMCPY(pIOPacket->pBuffer,GMboxIntControl,sizeof(GMboxIntControl));
 220
 221                 /* stick in our completion routine when the I/O operation completes */
 222             pIOPacket->Completion = DevGMboxIRQActionAsyncHandler;
 223             pIOPacket->pContext = pDev;
 224             pIOPacket->PktInfo.AsRx.HTCRxFlags = IrqAction;
 225                 /* write it out asynchronously */
 226             HIFReadWrite(pDev->HIFDevice,
 227                          GMBOX_INT_STATUS_ENABLE_REG,
 228                          pIOPacket->pBuffer,
 229                          sizeof(GMboxIntControl),
 230                          HIF_WR_ASYNC_BYTE_FIX,
 231                          pIOPacket);
 232             pIOPacket = NULL;
 233             break;
 234         }
 235
 236         /* if we get here we are doing it synchronously */
 237
 238         status = HIFReadWrite(pDev->HIFDevice,
 239                               GMBOX_INT_STATUS_ENABLE_REG,
 240                               GMboxIntControl,
 241                               sizeof(GMboxIntControl),
 242                               HIF_WR_SYNC_BYTE_FIX,
 243                               NULL);
 244
 245     } while (FALSE);
 246
 247     if (A_FAILED(status)) {
 248         AR_DEBUG_PRINTF(ATH_DEBUG_ERR,
 249                 (" IRQAction Operation (%d) failed! status:%d \n", IrqAction, status));
 250     } else {
 251         if (!AsyncMode) {
 252             AR_DEBUG_PRINTF(ATH_DEBUG_IRQ,
 253                     (" IRQAction Operation (%d) success \n", IrqAction));
 254         }
 255     }
 256
 257     if (pIOPacket != NULL) {
 258         AR6KFreeIOPacket(pDev,pIOPacket);
 259     }
 260
 261     return status;
 262 }
 263
 264 void DevCleanupGMbox(AR6K_DEVICE *pDev)
 265 {
 266     if (pDev->GMboxEnabled) {
 267         pDev->GMboxEnabled = FALSE;
 268         GMboxProtocolUninstall(pDev);
 269     }
 270 }
 271
 272 A_STATUS DevSetupGMbox(AR6K_DEVICE *pDev)
 273 {
 274     A_STATUS    status = A_OK;
 275     A_UINT8     muxControl[4];
 276
 277     do {
 278
 279         if (0 == pDev->MailBoxInfo.GMboxAddress) {
 280             break;
 281         }
 282
 283         AR_DEBUG_PRINTF(ATH_DEBUG_ANY,(" GMBOX Advertised: Address:0x%X , size:%d \n",
 284                     pDev->MailBoxInfo.GMboxAddress, pDev->MailBoxInfo.GMboxSize));
 285
 286         status = DevGMboxIRQAction(pDev, GMBOX_DISABLE_ALL, PROC_IO_SYNC);
 287
 288         if (A_FAILED(status)) {
 289             break;
 290         }
 291
 292             /* write to mailbox look ahead mux control register, we want the
 293              * GMBOX lookaheads to appear on lookaheads 2 and 3
 294              * the register is 1-byte wide so we need to hit it 4 times to align the operation
 295              * to 4-bytes */
 296         muxControl[0] = GMBOX_LA_MUX_OVERRIDE_2_3;
 297         muxControl[1] = GMBOX_LA_MUX_OVERRIDE_2_3;
 298         muxControl[2] = GMBOX_LA_MUX_OVERRIDE_2_3;
 299         muxControl[3] = GMBOX_LA_MUX_OVERRIDE_2_3;
 300
 301         status = HIFReadWrite(pDev->HIFDevice,
 302                               GMBOX_LOOKAHEAD_MUX_REG,
 303                               muxControl,
 304                               sizeof(muxControl),
 305                               HIF_WR_SYNC_BYTE_FIX,  /* hit this register 4 times */
 306                               NULL);
 307
 308         if (A_FAILED(status)) {
 309             break;
 310         }
 311
 312         status = GMboxProtocolInstall(pDev);
 313
 314         if (A_FAILED(status)) {
 315             break;
 316         }
 317
 318         pDev->GMboxEnabled = TRUE;
 319
 320     } while (FALSE);
 321
 322     return status;
 323 }
 324
 325 A_STATUS DevCheckGMboxInterrupts(AR6K_DEVICE *pDev)
 326 {
 327     A_STATUS status = A_OK;
 328     A_UINT8  counter_int_status;
 329     int      credits;
 330     A_UINT8  host_int_status2;
 331
 332     AR_DEBUG_PRINTF(ATH_DEBUG_IRQ, ("+DevCheckGMboxInterrupts \n"));
 333
 334     /* the caller guarantees that this is a context that allows for blocking I/O */
 335
 336     do {
 337
 338         host_int_status2 = pDev->IrqProcRegisters.host_int_status2 &
 339                            pDev->GMboxControlRegisters.int_status_enable;
 340
 341         if (host_int_status2 & GMBOX_INT_STATUS_TX_OVERFLOW) {
 342             AR_DEBUG_PRINTF(ATH_DEBUG_ERR, ("GMBOX : TX Overflow \n"));
 343             status = A_ECOMM;
 344         }
 345
 346         if (host_int_status2 & GMBOX_INT_STATUS_RX_OVERFLOW) {
 347             AR_DEBUG_PRINTF(ATH_DEBUG_ERR, ("GMBOX : RX Overflow \n"));
 348             status = A_ECOMM;
 349         }
 350
 351         if (A_FAILED(status)) {
 352             if (pDev->GMboxInfo.pTargetFailureCallback != NULL) {
 353                 pDev->GMboxInfo.pTargetFailureCallback(pDev->GMboxInfo.pProtocolContext, status);
 354             }
 355             break;
 356         }
 357
 358         if (host_int_status2 & GMBOX_INT_STATUS_RX_DATA) {
 359             if (pDev->IrqProcRegisters.gmbox_rx_avail > 0) {
 360                 A_ASSERT(pDev->GMboxInfo.pMessagePendingCallBack != NULL);
 361                 status = pDev->GMboxInfo.pMessagePendingCallBack(
 362                                 pDev->GMboxInfo.pProtocolContext,
 363                                 (A_UINT8 *)&pDev->IrqProcRegisters.rx_gmbox_lookahead_alias[0],
 364                                 pDev->IrqProcRegisters.gmbox_rx_avail);
 365             }
 366         }
 367
 368         if (A_FAILED(status)) {
 369            break;
 370         }
 371
 372         counter_int_status = pDev->IrqProcRegisters.counter_int_status &
 373                              pDev->IrqEnableRegisters.counter_int_status_enable;
 374
 375             /* check if credit interrupt is pending */
 376         if (counter_int_status & (COUNTER_INT_STATUS_ENABLE_BIT_SET(1 << AR6K_GMBOX_CREDIT_COUNTER))) {
 377
 378                 /* do synchronous read */
 379             status = DevGMboxReadCreditCounter(pDev, PROC_IO_SYNC, &credits);
 380
 381             if (A_FAILED(status)) {
 382                 break;
 383             }
 384
 385             A_ASSERT(pDev->GMboxInfo.pCreditsPendingCallback != NULL);
 386             status = pDev->GMboxInfo.pCreditsPendingCallback(pDev->GMboxInfo.pProtocolContext,
 387                                                              credits,
 388                                                              pDev->GMboxInfo.CreditCountIRQEnabled);
 389         }
 390
 391     } while (FALSE);
 392
 393     AR_DEBUG_PRINTF(ATH_DEBUG_IRQ, ("-DevCheckGMboxInterrupts (%d) \n",status));
 394
 395     return status;
 396 }
 397
 398
 399 A_STATUS DevGMboxWrite(AR6K_DEVICE *pDev, HTC_PACKET *pPacket, A_UINT32 WriteLength)
 400 {
 401     A_UINT32 paddedLength;
 402     A_BOOL   sync = (pPacket->Completion == NULL) ? TRUE : FALSE;
 403     A_STATUS status;
 404     A_UINT32 address;
 405
 406        /* adjust the length to be a multiple of block size if appropriate */
 407     paddedLength = DEV_CALC_SEND_PADDED_LEN(pDev, WriteLength);
 408
 409     AR_DEBUG_PRINTF(ATH_DEBUG_SEND,
 410                 ("DevGMboxWrite, Padded Length: %d Mbox:0x%X (mode:%s)\n",
 411                 WriteLength,
 412                 pDev->MailBoxInfo.GMboxAddress,
 413                 sync ? "SYNC" : "ASYNC"));
 414
 415         /* last byte of packet has to hit the EOM marker */
 416     address = pDev->MailBoxInfo.GMboxAddress + pDev->MailBoxInfo.GMboxSize - paddedLength;
 417
 418     status = HIFReadWrite(pDev->HIFDevice,
 419                           address,
 420                           pPacket->pBuffer,
 421                           paddedLength,     /* the padded length */
 422                           sync ? HIF_WR_SYNC_BLOCK_INC : HIF_WR_ASYNC_BLOCK_INC,
 423                           sync ? NULL : pPacket);  /* pass the packet as the context to the HIF request */
 424
 425     if (sync) {
 426         pPacket->Status = status;
 427     } else {
 428         if (status == A_PENDING) {
 429             status = A_OK;
 430         }
 431     }
 432
 433     return status;
 434 }
 435
 436 A_STATUS DevGMboxRead(AR6K_DEVICE *pDev, HTC_PACKET *pPacket, A_UINT32 ReadLength)
 437 {
 438
 439     A_UINT32 paddedLength;
 440     A_STATUS status;
 441     A_BOOL   sync = (pPacket->Completion == NULL) ? TRUE : FALSE;
 442
 443         /* adjust the length to be a multiple of block size if appropriate */
 444     paddedLength = DEV_CALC_RECV_PADDED_LEN(pDev, ReadLength);
 445
 446     if (paddedLength > pPacket->BufferLength) {
 447         A_ASSERT(FALSE);
 448         AR_DEBUG_PRINTF(ATH_DEBUG_ERR,
 449                 ("DevGMboxRead, Not enough space for padlen:%d recvlen:%d bufferlen:%d \n",
 450                     paddedLength,ReadLength,pPacket->BufferLength));
 451         if (pPacket->Completion != NULL) {
 452             COMPLETE_HTC_PACKET(pPacket,A_EINVAL);
 453             return A_OK;
 454         }
 455         return A_EINVAL;
 456     }
 457
 458     AR_DEBUG_PRINTF(ATH_DEBUG_RECV,
 459                 ("DevGMboxRead (0x%lX : hdr:0x%X) Padded Length: %d Mbox:0x%X (mode:%s)\n",
 460                 (unsigned long)pPacket, pPacket->PktInfo.AsRx.ExpectedHdr,
 461                 paddedLength,
 462                 pDev->MailBoxInfo.GMboxAddress,
 463                 sync ? "SYNC" : "ASYNC"));
 464
 465     status = HIFReadWrite(pDev->HIFDevice,
 466                           pDev->MailBoxInfo.GMboxAddress,
 467                           pPacket->pBuffer,
 468                           paddedLength,
 469                           sync ? HIF_RD_SYNC_BLOCK_FIX : HIF_RD_ASYNC_BLOCK_FIX,
 470                           sync ? NULL : pPacket);  /* pass the packet as the context to the HIF request */
 471
 472     if (sync) {
 473         pPacket->Status = status;
 474     }
 475
 476     return status;
 477 }
 478
 479
 480 static int ProcessCreditCounterReadBuffer(A_UINT8 *pBuffer, int Length)
 481 {
 482     int     credits = 0;
 483
 484     /* theory of how this works:
 485      * We read the credit decrement register multiple times on a byte-wide basis.
 486      * The number of times (32) aligns the I/O operation to be a multiple of 4 bytes and provides a
 487      * reasonable chance to acquire "all" pending credits in a single I/O operation.
 488      *
 489      * Once we obtain the filled buffer, we can walk through it looking for credit decrement transitions.
 490      * Each non-zero byte represents a single credit decrement (which is a credit given back to the host)
 491      * For example if the target provides 3 credits and added 4 more during the 32-byte read operation the following
 492      * pattern "could" appear:
 493      *
 494      *    0x3 0x2 0x1 0x0 0x0 0x0 0x0 0x0 0x1 0x0 0x1 0x0 0x1 0x0 0x1 0x0 ......rest zeros
 495      *    <--------->                     <----------------------------->
 496      *         \_ credits aleady there              \_ target adding 4 more credits
 497      *
 498      *    The total available credits would be 7, since there are 7 non-zero bytes in the buffer.
 499      *
 500      * */
 501
 502     if (AR_DEBUG_LVL_CHECK(ATH_DEBUG_RECV)) {
 503         DebugDumpBytes(pBuffer, Length, "GMBOX Credit read buffer");
 504     }
 505
 506     while (Length) {
 507         if (*pBuffer != 0) {
 508             credits++;
 509         }
 510         Length--;
 511         pBuffer++;
 512     }
 513
 514     return credits;
 515 }
 516
 517
 518 /* callback when our fetch to enable/disable completes */
 519 static void DevGMboxReadCreditsAsyncHandler(void *Context, HTC_PACKET *pPacket)
 520 {
 521     AR6K_DEVICE *pDev = (AR6K_DEVICE *)Context;
 522
 523     AR_DEBUG_PRINTF(ATH_DEBUG_IRQ,("+DevGMboxReadCreditsAsyncHandler: (dev: 0x%lX)\n", (unsigned long)pDev));
 524
 525     if (A_FAILED(pPacket->Status)) {
 526         AR_DEBUG_PRINTF(ATH_DEBUG_ERR,
 527                 ("Read Credit Operation failed! status:%d \n", pPacket->Status));
 528     } else {
 529         int credits = 0;
 530         credits = ProcessCreditCounterReadBuffer(pPacket->pBuffer, AR6K_REG_IO_BUFFER_SIZE);
 531         pDev->GMboxInfo.pCreditsPendingCallback(pDev->GMboxInfo.pProtocolContext,
 532                                                 credits,
 533                                                 pDev->GMboxInfo.CreditCountIRQEnabled);
 534
 535
 536     }
 537         /* free this IO packet */
 538     AR6KFreeIOPacket(pDev,pPacket);
 539     AR_DEBUG_PRINTF(ATH_DEBUG_IRQ,("-DevGMboxReadCreditsAsyncHandler \n"));
 540 }
 541
 542 A_STATUS DevGMboxReadCreditCounter(AR6K_DEVICE *pDev, A_BOOL AsyncMode, int *pCredits)
 543 {
 544     A_STATUS    status = A_OK;
 545     HTC_PACKET  *pIOPacket = NULL;
 546
 547     AR_DEBUG_PRINTF(ATH_DEBUG_SEND,("+DevGMboxReadCreditCounter (%s) \n", AsyncMode ? "ASYNC" : "SYNC"));
 548
 549     do {
 550
 551         pIOPacket = AR6KAllocIOPacket(pDev);
 552
 553         if (NULL == pIOPacket) {
 554             status = A_NO_MEMORY;
 555             A_ASSERT(FALSE);
 556             break;
 557         }
 558
 559         A_MEMZERO(pIOPacket->pBuffer,AR6K_REG_IO_BUFFER_SIZE);
 560
 561         if (AsyncMode) {
 562                 /* stick in our completion routine when the I/O operation completes */
 563             pIOPacket->Completion = DevGMboxReadCreditsAsyncHandler;
 564             pIOPacket->pContext = pDev;
 565                 /* read registers asynchronously */
 566             HIFReadWrite(pDev->HIFDevice,
 567                          AR6K_GMBOX_CREDIT_DEC_ADDRESS,
 568                          pIOPacket->pBuffer,
 569                          AR6K_REG_IO_BUFFER_SIZE,  /* hit the register multiple times */
 570                          HIF_RD_ASYNC_BYTE_FIX,
 571                          pIOPacket);
 572             pIOPacket = NULL;
 573             break;
 574         }
 575
 576         pIOPacket->Completion = NULL;
 577             /* if we get here we are doing it synchronously */
 578         status = HIFReadWrite(pDev->HIFDevice,
 579                               AR6K_GMBOX_CREDIT_DEC_ADDRESS,
 580                               pIOPacket->pBuffer,
 581                               AR6K_REG_IO_BUFFER_SIZE,
 582                               HIF_RD_SYNC_BYTE_FIX,
 583                               NULL);
 584     } while (FALSE);
 585
 586     if (A_FAILED(status)) {
 587         AR_DEBUG_PRINTF(ATH_DEBUG_ERR,
 588                 (" DevGMboxReadCreditCounter failed! status:%d \n", status));
 589     }
 590
 591     if (pIOPacket != NULL) {
 592         if (A_SUCCESS(status)) {
 593                 /* sync mode processing */
 594             *pCredits = ProcessCreditCounterReadBuffer(pIOPacket->pBuffer, AR6K_REG_IO_BUFFER_SIZE);
 595         }
 596         AR6KFreeIOPacket(pDev,pIOPacket);
 597     }
 598
 599     AR_DEBUG_PRINTF(ATH_DEBUG_SEND,("-DevGMboxReadCreditCounter (%s) (%d) \n",
 600             AsyncMode ? "ASYNC" : "SYNC", status));
 601
 602     return status;
 603 }
 604
 605 A_STATUS DevGMboxReadCreditSize(AR6K_DEVICE *pDev, int *pCreditSize)
 606 {
 607     A_STATUS    status;
 608     A_UINT8     buffer[4];
 609
 610     status = HIFReadWrite(pDev->HIFDevice,
 611                           AR6K_GMBOX_CREDIT_SIZE_ADDRESS,
 612                           buffer,
 613                           sizeof(buffer),
 614                           HIF_RD_SYNC_BYTE_FIX, /* hit the register 4 times to align the I/O */
 615                           NULL);
 616
 617     if (A_SUCCESS(status)) {
 618         if (buffer[0] == 0) {
 619             *pCreditSize = 256;
 620         } else {
 621             *pCreditSize = buffer[0];
 622         }
 623
 624     }
 625
 626     return status;
 627 }
 628
 629 void DevNotifyGMboxTargetFailure(AR6K_DEVICE *pDev)
 630 {
 631         /* Target ASSERTED!!! */
 632     if (pDev->GMboxInfo.pTargetFailureCallback != NULL) {
 633         pDev->GMboxInfo.pTargetFailureCallback(pDev->GMboxInfo.pProtocolContext, A_HARDWARE);
 634     }
 635 }
 636
 637 A_STATUS DevGMboxRecvLookAheadPeek(AR6K_DEVICE *pDev, A_UINT8 *pLookAheadBuffer, int *pLookAheadBytes)
 638 {
 639
 640     A_STATUS                    status = A_OK;
 641     AR6K_IRQ_PROC_REGISTERS     procRegs;
 642     int                         maxCopy;
 643
 644     do {
 645             /* on entry the caller provides the length of the lookahead buffer */
 646         if (*pLookAheadBytes > sizeof(procRegs.rx_gmbox_lookahead_alias)) {
 647             A_ASSERT(FALSE);
 648             status = A_EINVAL;
 649             break;
 650         }
 651
 652         maxCopy = *pLookAheadBytes;
 653         *pLookAheadBytes = 0;
 654             /* load the register table from the device */
 655         status = HIFReadWrite(pDev->HIFDevice,
 656                               HOST_INT_STATUS_ADDRESS,
 657                               (A_UINT8 *)&procRegs,
 658                               AR6K_IRQ_PROC_REGS_SIZE,
 659                               HIF_RD_SYNC_BYTE_INC,
 660                               NULL);
 661
 662         if (A_FAILED(status)) {
 663             AR_DEBUG_PRINTF(ATH_DEBUG_ERR,
 664                 ("DevGMboxRecvLookAheadPeek : Failed to read register table (%d) \n",status));
 665             break;
 666         }
 667
 668         if (procRegs.gmbox_rx_avail > 0) {
 669             int bytes = procRegs.gmbox_rx_avail > maxCopy ? maxCopy : procRegs.gmbox_rx_avail;
 670             A_MEMCPY(pLookAheadBuffer,&procRegs.rx_gmbox_lookahead_alias[0],bytes);
 671             *pLookAheadBytes = bytes;
 672         }
 673
 674     } while (FALSE);
 675
 676     return status;
 677 }
 678
 679 A_STATUS DevGMboxSetTargetInterrupt(AR6K_DEVICE *pDev, int Signal, int AckTimeoutMS)
 680 {
 681     A_STATUS status = A_OK;
 682     int      i;
 683     A_UINT8  buffer[4];
 684
 685     A_MEMZERO(buffer, sizeof(buffer));
 686
 687     do {
 688
 689         if (Signal >= MBOX_SIG_HCI_BRIDGE_MAX) {
 690             status = A_EINVAL;
 691             break;
 692         }
 693
 694             /* set the last buffer to do the actual signal trigger */
 695         buffer[3] = (1 << Signal);
 696
 697         status = HIFReadWrite(pDev->HIFDevice,
 698                               INT_WLAN_ADDRESS,
 699                               buffer,
 700                               sizeof(buffer),
 701                               HIF_WR_SYNC_BYTE_FIX, /* hit the register 4 times to align the I/O */
 702                               NULL);
 703
 704         if (A_FAILED(status)) {
 705             break;
 706         }
 707
 708     } while (FALSE);
 709
 710
 711     if (A_SUCCESS(status)) {
 712             /* now read back the register to see if the bit cleared */
 713         while (AckTimeoutMS) {
 714             status = HIFReadWrite(pDev->HIFDevice,
 715                                   INT_WLAN_ADDRESS,
 716                                   buffer,
 717                                   sizeof(buffer),
 718                                   HIF_RD_SYNC_BYTE_FIX,
 719                                   NULL);
 720
 721             if (A_FAILED(status)) {
 722                 break;
 723             }
 724
 725             for (i = 0; i < sizeof(buffer); i++) {
 726                 if (buffer[i] & (1 << Signal)) {
 727                     /* bit is still set */
 728                     break;
 729                 }
 730             }
 731
 732             if (i >= sizeof(buffer)) {
 733                 /* done */
 734                 break;
 735             }
 736
 737             AckTimeoutMS--;
 738             A_MDELAY(1);
 739         }
 740
 741         if (0 == AckTimeoutMS) {
 742             AR_DEBUG_PRINTF(ATH_DEBUG_ERR,
 743                 ("DevGMboxSetTargetInterrupt : Ack Timed-out (sig:%d) \n",Signal));
 744             status = A_ERROR;
 745         }
 746     }
 747
 748     return status;
 749
 750 }
 751
 752 #endif  //ATH_AR6K_ENABLE_GMBOX
 753
 754
 755
 756