//------------------------------------------------------------------------------ // ISC License (ISC) // // Copyright (c) 2007-2010, The Linux Foundation // All rights reserved. // Software was previously licensed under ISC license by Qualcomm Atheros, Inc. // // // Permission to use, copy, modify, and/or distribute this software for any // purpose with or without fee is hereby granted, provided that the above // copyright notice and this permission notice appear in all copies. // // THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES // WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF // MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR // ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES // WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN // ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF // OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. // // //------------------------------------------------------------------------------ //============================================================================== // AR6K Driver layer event handling (i.e. interrupts, message polling) // // Author(s): ="Atheros" //============================================================================== #include "a_config.h" #include "athdefs.h" #include "a_types.h" #include "a_osapi.h" #include "../htc_debug.h" #include "hif.h" #include "htc_packet.h" #include "ar6k.h" #include "target_reg_table.h" #include "host_reg_table.h" extern void AR6KFreeIOPacket(AR6K_DEVICE *pDev, HTC_PACKET *pPacket); extern HTC_PACKET *AR6KAllocIOPacket(AR6K_DEVICE *pDev); static A_STATUS DevServiceDebugInterrupt(AR6K_DEVICE *pDev); #define DELAY_PER_INTERVAL_MS 10 /* 10 MS delay per polling interval */ /* completion routine for ALL HIF layer async I/O */ A_STATUS DevRWCompletionHandler(void *context, A_STATUS status) { HTC_PACKET *pPacket = (HTC_PACKET *)context; AR_DEBUG_PRINTF(ATH_DEBUG_RECV, ("+DevRWCompletionHandler (Pkt:0x%lX) , Status: %d \n", (unsigned long)pPacket, status)); COMPLETE_HTC_PACKET(pPacket,status); AR_DEBUG_PRINTF(ATH_DEBUG_RECV, ("-DevRWCompletionHandler\n")); return A_OK; } /* mailbox recv message polling */ A_STATUS DevPollMboxMsgRecv(AR6K_DEVICE *pDev, A_UINT32 *pLookAhead, int TimeoutMS) { A_STATUS status = A_OK; int timeout = TimeoutMS/DELAY_PER_INTERVAL_MS; A_ASSERT(timeout > 0); AR_DEBUG_PRINTF(ATH_DEBUG_RECV,("+DevPollMboxMsgRecv \n")); while (TRUE) { if (pDev->GetPendingEventsFunc != NULL) { HIF_PENDING_EVENTS_INFO events; /* the HIF layer uses a special mechanism to get events, do this * synchronously */ status = pDev->GetPendingEventsFunc(pDev->HIFDevice, &events, NULL); if (A_FAILED(status)) { AR_DEBUG_PRINTF(ATH_DEBUG_ERR,("Failed to get pending events \n")); break; } if (events.Events & HIF_RECV_MSG_AVAIL) { /* there is a message available, the lookahead should be valid now */ *pLookAhead = events.LookAhead; break; } } else { /* this is the standard HIF way.... */ /* load the register table */ status = HIFReadWrite(pDev->HIFDevice, HOST_INT_STATUS_ADDRESS, (A_UINT8 *)&pDev->IrqProcRegisters, AR6K_IRQ_PROC_REGS_SIZE, HIF_RD_SYNC_BYTE_INC, NULL); if (A_FAILED(status)){ AR_DEBUG_PRINTF(ATH_DEBUG_ERR,("Failed to read register table \n")); break; } /* check for MBOX data and valid lookahead */ if (pDev->IrqProcRegisters.host_int_status & (1 << HTC_MAILBOX)) { if (pDev->IrqProcRegisters.rx_lookahead_valid & (1 << HTC_MAILBOX)) { /* mailbox has a message and the look ahead is valid */ *pLookAhead = pDev->IrqProcRegisters.rx_lookahead[HTC_MAILBOX]; break; } } } timeout--; if (timeout <= 0) { AR_DEBUG_PRINTF(ATH_DEBUG_ERR, (" Timeout waiting for recv message \n")); status = A_ERROR; /* check if the target asserted */ if ( pDev->IrqProcRegisters.counter_int_status & AR6K_TARGET_DEBUG_INTR_MASK) { /* target signaled an assert, process this pending interrupt * this will call the target failure handler */ DevServiceDebugInterrupt(pDev); } break; } /* delay a little */ A_MDELAY(DELAY_PER_INTERVAL_MS); AR_DEBUG_PRINTF(ATH_DEBUG_RECV,(" Retry Mbox Poll : %d \n",timeout)); } AR_DEBUG_PRINTF(ATH_DEBUG_RECV,("-DevPollMboxMsgRecv \n")); return status; } static A_STATUS DevServiceCPUInterrupt(AR6K_DEVICE *pDev) { A_STATUS status; A_UINT8 cpu_int_status; A_UINT8 regBuffer[4]; AR_DEBUG_PRINTF(ATH_DEBUG_IRQ, ("CPU Interrupt\n")); cpu_int_status = pDev->IrqProcRegisters.cpu_int_status & pDev->IrqEnableRegisters.cpu_int_status_enable; A_ASSERT(cpu_int_status); AR_DEBUG_PRINTF(ATH_DEBUG_IRQ, ("Valid interrupt source(s) in CPU_INT_STATUS: 0x%x\n", cpu_int_status)); /* Clear the interrupt */ pDev->IrqProcRegisters.cpu_int_status &= ~cpu_int_status; /* W1C */ /* set up the register transfer buffer to hit the register 4 times , this is done * to make the access 4-byte aligned to mitigate issues with host bus interconnects that * restrict bus transfer lengths to be a multiple of 4-bytes */ /* set W1C value to clear the interrupt, this hits the register first */ regBuffer[0] = cpu_int_status; /* the remaining 4 values are set to zero which have no-effect */ regBuffer[1] = 0; regBuffer[2] = 0; regBuffer[3] = 0; status = HIFReadWrite(pDev->HIFDevice, CPU_INT_STATUS_ADDRESS, regBuffer, 4, HIF_WR_SYNC_BYTE_FIX, NULL); A_ASSERT(status == A_OK); return status; } static A_STATUS DevServiceErrorInterrupt(AR6K_DEVICE *pDev) { A_STATUS status; A_UINT8 error_int_status; A_UINT8 regBuffer[4]; AR_DEBUG_PRINTF(ATH_DEBUG_IRQ, ("Error Interrupt\n")); error_int_status = pDev->IrqProcRegisters.error_int_status & 0x0F; A_ASSERT(error_int_status); AR_DEBUG_PRINTF(ATH_DEBUG_IRQ, ("Valid interrupt source(s) in ERROR_INT_STATUS: 0x%x\n", error_int_status)); if (ERROR_INT_STATUS_WAKEUP_GET(error_int_status)) { /* Wakeup */ AR_DEBUG_PRINTF(ATH_DEBUG_IRQ, ("Error : Wakeup\n")); } if (ERROR_INT_STATUS_RX_UNDERFLOW_GET(error_int_status)) { /* Rx Underflow */ AR_DEBUG_PRINTF(ATH_DEBUG_ERR, ("Error : Rx Underflow\n")); } if (ERROR_INT_STATUS_TX_OVERFLOW_GET(error_int_status)) { /* Tx Overflow */ AR_DEBUG_PRINTF(ATH_DEBUG_ERR, ("Error : Tx Overflow\n")); } /* Clear the interrupt */ pDev->IrqProcRegisters.error_int_status &= ~error_int_status; /* W1C */ /* set up the register transfer buffer to hit the register 4 times , this is done * to make the access 4-byte aligned to mitigate issues with host bus interconnects that * restrict bus transfer lengths to be a multiple of 4-bytes */ /* set W1C value to clear the interrupt, this hits the register first */ regBuffer[0] = error_int_status; /* the remaining 4 values are set to zero which have no-effect */ regBuffer[1] = 0; regBuffer[2] = 0; regBuffer[3] = 0; status = HIFReadWrite(pDev->HIFDevice, ERROR_INT_STATUS_ADDRESS, regBuffer, 4, HIF_WR_SYNC_BYTE_FIX, NULL); A_ASSERT(status == A_OK); return status; } static A_STATUS DevServiceDebugInterrupt(AR6K_DEVICE *pDev) { A_UINT32 dummy; A_STATUS status; /* Send a target failure event to the application */ AR_DEBUG_PRINTF(ATH_DEBUG_ERR, ("Target debug interrupt\n")); if (pDev->TargetFailureCallback != NULL) { pDev->TargetFailureCallback(pDev->HTCContext); } if (pDev->GMboxEnabled) { DevNotifyGMboxTargetFailure(pDev); } /* clear the interrupt , the debug error interrupt is * counter 0 */ /* read counter to clear interrupt */ status = HIFReadWrite(pDev->HIFDevice, COUNT_DEC_ADDRESS, (A_UINT8 *)&dummy, 4, HIF_RD_SYNC_BYTE_INC, NULL); A_ASSERT(status == A_OK); return status; } static A_STATUS DevServiceCounterInterrupt(AR6K_DEVICE *pDev) { A_UINT8 counter_int_status; AR_DEBUG_PRINTF(ATH_DEBUG_IRQ, ("Counter Interrupt\n")); counter_int_status = pDev->IrqProcRegisters.counter_int_status & pDev->IrqEnableRegisters.counter_int_status_enable; AR_DEBUG_PRINTF(ATH_DEBUG_IRQ, ("Valid interrupt source(s) in COUNTER_INT_STATUS: 0x%x\n", counter_int_status)); /* Check if the debug interrupt is pending * NOTE: other modules like GMBOX may use the counter interrupt for * credit flow control on other counters, we only need to check for the debug assertion * counter interrupt */ if (counter_int_status & AR6K_TARGET_DEBUG_INTR_MASK) { return DevServiceDebugInterrupt(pDev); } return A_OK; } /* callback when our fetch to get interrupt status registers completes */ static void DevGetEventAsyncHandler(void *Context, HTC_PACKET *pPacket) { AR6K_DEVICE *pDev = (AR6K_DEVICE *)Context; A_UINT32 lookAhead = 0; A_BOOL otherInts = FALSE; AR_DEBUG_PRINTF(ATH_DEBUG_IRQ,("+DevGetEventAsyncHandler: (dev: 0x%lX)\n", (unsigned long)pDev)); do { if (A_FAILED(pPacket->Status)) { AR_DEBUG_PRINTF(ATH_DEBUG_ERR, (" GetEvents I/O request failed, status:%d \n", pPacket->Status)); /* bail out, don't unmask HIF interrupt */ break; } if (pDev->GetPendingEventsFunc != NULL) { /* the HIF layer collected the information for us */ HIF_PENDING_EVENTS_INFO *pEvents = (HIF_PENDING_EVENTS_INFO *)pPacket->pBuffer; if (pEvents->Events & HIF_RECV_MSG_AVAIL) { lookAhead = pEvents->LookAhead; if (0 == lookAhead) { AR_DEBUG_PRINTF(ATH_DEBUG_ERR,(" DevGetEventAsyncHandler1, lookAhead is zero! \n")); } } if (pEvents->Events & HIF_OTHER_EVENTS) { otherInts = TRUE; } } else { /* standard interrupt table handling.... */ AR6K_IRQ_PROC_REGISTERS *pReg = (AR6K_IRQ_PROC_REGISTERS *)pPacket->pBuffer; A_UINT8 host_int_status; host_int_status = pReg->host_int_status & pDev->IrqEnableRegisters.int_status_enable; if (host_int_status & (1 << HTC_MAILBOX)) { host_int_status &= ~(1 << HTC_MAILBOX); if (pReg->rx_lookahead_valid & (1 << HTC_MAILBOX)) { /* mailbox has a message and the look ahead is valid */ lookAhead = pReg->rx_lookahead[HTC_MAILBOX]; if (0 == lookAhead) { AR_DEBUG_PRINTF(ATH_DEBUG_ERR,(" DevGetEventAsyncHandler2, lookAhead is zero! \n")); } } } if (host_int_status) { /* there are other interrupts to handle */ otherInts = TRUE; } } if (otherInts || (lookAhead == 0)) { /* if there are other interrupts to process, we cannot do this in the async handler so * ack the interrupt which will cause our sync handler to run again * if however there are no more messages, we can now ack the interrupt */ AR_DEBUG_PRINTF(ATH_DEBUG_IRQ, (" Acking interrupt from DevGetEventAsyncHandler (otherints:%d, lookahead:0x%X)\n", otherInts, lookAhead)); HIFAckInterrupt(pDev->HIFDevice); } else { int fetched = 0; A_STATUS status; AR_DEBUG_PRINTF(ATH_DEBUG_IRQ, (" DevGetEventAsyncHandler : detected another message, lookahead :0x%X \n", lookAhead)); /* lookahead is non-zero and there are no other interrupts to service, * go get the next message */ status = pDev->MessagePendingCallback(pDev->HTCContext, &lookAhead, 1, NULL, &fetched); if (A_SUCCESS(status) && !fetched) { /* HTC layer could not pull out messages due to lack of resources, stop IRQ processing */ AR_DEBUG_PRINTF(ATH_DEBUG_IRQ,("MessagePendingCallback did not pull any messages, force-ack \n")); DevAsyncIrqProcessComplete(pDev); } } } while (FALSE); /* free this IO packet */ AR6KFreeIOPacket(pDev,pPacket); AR_DEBUG_PRINTF(ATH_DEBUG_IRQ,("-DevGetEventAsyncHandler \n")); } /* called by the HTC layer when it wants us to check if the device has any more pending * recv messages, this starts off a series of async requests to read interrupt registers */ A_STATUS DevCheckPendingRecvMsgsAsync(void *context) { AR6K_DEVICE *pDev = (AR6K_DEVICE *)context; A_STATUS status = A_OK; HTC_PACKET *pIOPacket; /* this is called in an ASYNC only context, we may NOT block, sleep or call any apis that can * cause us to switch contexts */ AR_DEBUG_PRINTF(ATH_DEBUG_IRQ,("+DevCheckPendingRecvMsgsAsync: (dev: 0x%lX)\n", (unsigned long)pDev)); do { if (HIF_DEVICE_IRQ_SYNC_ONLY == pDev->HifIRQProcessingMode) { /* break the async processing chain right here, no need to continue. * The DevDsrHandler() will handle things in a loop when things are driven * synchronously */ break; } /* an optimization to bypass reading the IRQ status registers unecessarily which can re-wake * the target, if upper layers determine that we are in a low-throughput mode, we can * rely on taking another interrupt rather than re-checking the status registers which can * re-wake the target */ if (pDev->RecheckIRQStatusCnt == 0) { AR_DEBUG_PRINTF(ATH_DEBUG_IRQ,("Bypassing IRQ Status re-check, re-acking HIF interrupts\n")); /* ack interrupt */ HIFAckInterrupt(pDev->HIFDevice); break; } /* first allocate one of our HTC packets we created for async I/O * we reuse HTC packet definitions so that we can use the completion mechanism * in DevRWCompletionHandler() */ pIOPacket = AR6KAllocIOPacket(pDev); if (NULL == pIOPacket) { /* there should be only 1 asynchronous request out at a time to read these registers * so this should actually never happen */ status = A_NO_MEMORY; A_ASSERT(FALSE); break; } /* stick in our completion routine when the I/O operation completes */ pIOPacket->Completion = DevGetEventAsyncHandler; pIOPacket->pContext = pDev; if (pDev->GetPendingEventsFunc) { /* HIF layer has it's own mechanism, pass the IO to it.. */ status = pDev->GetPendingEventsFunc(pDev->HIFDevice, (HIF_PENDING_EVENTS_INFO *)pIOPacket->pBuffer, pIOPacket); } else { /* standard way, read the interrupt register table asynchronously again */ status = HIFReadWrite(pDev->HIFDevice, HOST_INT_STATUS_ADDRESS, pIOPacket->pBuffer, AR6K_IRQ_PROC_REGS_SIZE, HIF_RD_ASYNC_BYTE_INC, pIOPacket); } AR_DEBUG_PRINTF(ATH_DEBUG_IRQ,(" Async IO issued to get interrupt status...\n")); } while (FALSE); AR_DEBUG_PRINTF(ATH_DEBUG_IRQ,("-DevCheckPendingRecvMsgsAsync \n")); return status; } void DevAsyncIrqProcessComplete(AR6K_DEVICE *pDev) { AR_DEBUG_PRINTF(ATH_DEBUG_IRQ,("DevAsyncIrqProcessComplete - forcing HIF IRQ ACK \n")); HIFAckInterrupt(pDev->HIFDevice); } /* process pending interrupts synchronously */ static A_STATUS ProcessPendingIRQs(AR6K_DEVICE *pDev, A_BOOL *pDone, A_BOOL *pASyncProcessing) { A_STATUS status = A_OK; A_UINT8 host_int_status = 0; A_UINT32 lookAhead = 0; AR_DEBUG_PRINTF(ATH_DEBUG_IRQ,("+ProcessPendingIRQs: (dev: 0x%lX)\n", (unsigned long)pDev)); /*** NOTE: the HIF implementation guarantees that the context of this call allows * us to perform SYNCHRONOUS I/O, that is we can block, sleep or call any API that * can block or switch thread/task ontexts. * This is a fully schedulable context. * */ do { if (pDev->IrqEnableRegisters.int_status_enable == 0) { /* interrupt enables have been cleared, do not try to process any pending interrupts that * may result in more bus transactions. The target may be unresponsive at this * point. */ break; } if (pDev->GetPendingEventsFunc != NULL) { HIF_PENDING_EVENTS_INFO events; /* the HIF layer uses a special mechanism to get events * get this synchronously */ status = pDev->GetPendingEventsFunc(pDev->HIFDevice, &events, NULL); if (A_FAILED(status)) { break; } if (events.Events & HIF_RECV_MSG_AVAIL) { lookAhead = events.LookAhead; if (0 == lookAhead) { AR_DEBUG_PRINTF(ATH_DEBUG_ERR,(" ProcessPendingIRQs1 lookAhead is zero! \n")); } } if (!(events.Events & HIF_OTHER_EVENTS) || !(pDev->IrqEnableRegisters.int_status_enable & OTHER_INTS_ENABLED)) { /* no need to read the register table, no other interesting interrupts. * Some interfaces (like SPI) can shadow interrupt sources without * requiring the host to do a full table read */ break; } /* otherwise fall through and read the register table */ } /* * Read the first 28 bytes of the HTC register table. This will yield us * the value of different int status registers and the lookahead * registers. * length = sizeof(int_status) + sizeof(cpu_int_status) + * sizeof(error_int_status) + sizeof(counter_int_status) + * sizeof(mbox_frame) + sizeof(rx_lookahead_valid) + * sizeof(hole) + sizeof(rx_lookahead) + * sizeof(int_status_enable) + sizeof(cpu_int_status_enable) + * sizeof(error_status_enable) + * sizeof(counter_int_status_enable); * */ status = HIFReadWrite(pDev->HIFDevice, HOST_INT_STATUS_ADDRESS, (A_UINT8 *)&pDev->IrqProcRegisters, AR6K_IRQ_PROC_REGS_SIZE, HIF_RD_SYNC_BYTE_INC, NULL); if (A_FAILED(status)) { break; } if (AR_DEBUG_LVL_CHECK(ATH_DEBUG_IRQ)) { DevDumpRegisters(pDev, &pDev->IrqProcRegisters, &pDev->IrqEnableRegisters); } /* Update only those registers that are enabled */ host_int_status = pDev->IrqProcRegisters.host_int_status & pDev->IrqEnableRegisters.int_status_enable; if (NULL == pDev->GetPendingEventsFunc) { /* only look at mailbox status if the HIF layer did not provide this function, * on some HIF interfaces reading the RX lookahead is not valid to do */ if (host_int_status & (1 << HTC_MAILBOX)) { /* mask out pending mailbox value, we use "lookAhead" as the real flag for * mailbox processing below */ host_int_status &= ~(1 << HTC_MAILBOX); if (pDev->IrqProcRegisters.rx_lookahead_valid & (1 << HTC_MAILBOX)) { /* mailbox has a message and the look ahead is valid */ lookAhead = pDev->IrqProcRegisters.rx_lookahead[HTC_MAILBOX]; if (0 == lookAhead) { AR_DEBUG_PRINTF(ATH_DEBUG_ERR,(" ProcessPendingIRQs2, lookAhead is zero! \n")); } } } } else { /* not valid to check if the HIF has another mechanism for reading mailbox pending status*/ host_int_status &= ~(1 << HTC_MAILBOX); } if (pDev->GMboxEnabled) { /*call GMBOX layer to process any interrupts of interest */ status = DevCheckGMboxInterrupts(pDev); } } while (FALSE); do { /* did the interrupt status fetches succeed? */ if (A_FAILED(status)) { break; } if ((0 == host_int_status) && (0 == lookAhead)) { /* nothing to process, the caller can use this to break out of a loop */ *pDone = TRUE; break; } if (lookAhead != 0) { int fetched = 0; AR_DEBUG_PRINTF(ATH_DEBUG_IRQ,("Pending mailbox message, LookAhead: 0x%X\n",lookAhead)); /* Mailbox Interrupt, the HTC layer may issue async requests to empty the * mailbox... * When emptying the recv mailbox we use the async handler above called from the * completion routine of the callers read request. This can improve performance * by reducing context switching when we rapidly pull packets */ status = pDev->MessagePendingCallback(pDev->HTCContext, &lookAhead, 1, pASyncProcessing, &fetched); if (A_FAILED(status)) { break; } if (!fetched) { /* HTC could not pull any messages out due to lack of resources */ /* force DSR handler to ack the interrupt */ *pASyncProcessing = FALSE; pDev->RecheckIRQStatusCnt = 0; } } /* now handle the rest of them */ AR_DEBUG_PRINTF(ATH_DEBUG_IRQ, (" Valid interrupt source(s) for OTHER interrupts: 0x%x\n", host_int_status)); if (HOST_INT_STATUS_CPU_GET(host_int_status)) { /* CPU Interrupt */ status = DevServiceCPUInterrupt(pDev); if (A_FAILED(status)){ break; } } if (HOST_INT_STATUS_ERROR_GET(host_int_status)) { /* Error Interrupt */ status = DevServiceErrorInterrupt(pDev); if (A_FAILED(status)){ break; } } if (HOST_INT_STATUS_COUNTER_GET(host_int_status)) { /* Counter Interrupt */ status = DevServiceCounterInterrupt(pDev); if (A_FAILED(status)){ break; } } } while (FALSE); /* an optimization to bypass reading the IRQ status registers unecessarily which can re-wake * the target, if upper layers determine that we are in a low-throughput mode, we can * rely on taking another interrupt rather than re-checking the status registers which can * re-wake the target. * * NOTE : for host interfaces that use the special GetPendingEventsFunc, this optimization cannot * be used due to possible side-effects. For example, SPI requires the host to drain all * messages from the mailbox before exiting the ISR routine. */ if (!(*pASyncProcessing) && (pDev->RecheckIRQStatusCnt == 0) && (pDev->GetPendingEventsFunc == NULL)) { AR_DEBUG_PRINTF(ATH_DEBUG_IRQ,("Bypassing IRQ Status re-check, forcing done \n")); *pDone = TRUE; } AR_DEBUG_PRINTF(ATH_DEBUG_IRQ,("-ProcessPendingIRQs: (done:%d, async:%d) status=%d \n", *pDone, *pASyncProcessing, status)); return status; } /* Synchronousinterrupt handler, this handler kicks off all interrupt processing.*/ A_STATUS DevDsrHandler(void *context) { AR6K_DEVICE *pDev = (AR6K_DEVICE *)context; A_STATUS status = A_OK; A_BOOL done = FALSE; A_BOOL asyncProc = FALSE; AR_DEBUG_PRINTF(ATH_DEBUG_IRQ,("+DevDsrHandler: (dev: 0x%lX)\n", (unsigned long)pDev)); /* reset the recv counter that tracks when we need to yield from the DSR */ pDev->CurrentDSRRecvCount = 0; /* reset counter used to flag a re-scan of IRQ status registers on the target */ pDev->RecheckIRQStatusCnt = 0; while (!done) { status = ProcessPendingIRQs(pDev, &done, &asyncProc); if (A_FAILED(status)) { break; } if (HIF_DEVICE_IRQ_SYNC_ONLY == pDev->HifIRQProcessingMode) { /* the HIF layer does not allow async IRQ processing, override the asyncProc flag */ asyncProc = FALSE; /* this will cause us to re-enter ProcessPendingIRQ() and re-read interrupt status registers. * this has a nice side effect of blocking us until all async read requests are completed. * This behavior is required on some HIF implementations that do not allow ASYNC * processing in interrupt handlers (like Windows CE) */ if (pDev->DSRCanYield && DEV_CHECK_RECV_YIELD(pDev)) { /* ProcessPendingIRQs() pulled enough recv messages to satisfy the yield count, stop * checking for more messages and return */ break; } } if (asyncProc) { /* the function performed some async I/O for performance, we need to exit the ISR immediately, the check below will prevent the interrupt from being Ack'd while we handle it asynchronously */ break; } } if (A_SUCCESS(status) && !asyncProc) { /* Ack the interrupt only if : * 1. we did not get any errors in processing interrupts * 2. there are no outstanding async processing requests */ if (pDev->DSRCanYield) { /* if the DSR can yield do not ACK the interrupt, there could be more pending messages. * The HIF layer must ACK the interrupt on behalf of HTC */ AR_DEBUG_PRINTF(ATH_DEBUG_IRQ,(" Yield in effect (cur RX count: %d) \n", pDev->CurrentDSRRecvCount)); } else { AR_DEBUG_PRINTF(ATH_DEBUG_IRQ,(" Acking interrupt from DevDsrHandler \n")); HIFAckInterrupt(pDev->HIFDevice); } } AR_DEBUG_PRINTF(ATH_DEBUG_IRQ,("-DevDsrHandler \n")); return status; } void DumpAR6KDevState(AR6K_DEVICE *pDev) { A_STATUS status; AR6K_IRQ_ENABLE_REGISTERS regs; AR6K_IRQ_PROC_REGISTERS procRegs; LOCK_AR6K(pDev); /* copy into our temp area */ A_MEMCPY(®s,&pDev->IrqEnableRegisters,AR6K_IRQ_ENABLE_REGS_SIZE); UNLOCK_AR6K(pDev); /* load the register table from the device */ status = HIFReadWrite(pDev->HIFDevice, HOST_INT_STATUS_ADDRESS, (A_UINT8 *)&procRegs, AR6K_IRQ_PROC_REGS_SIZE, HIF_RD_SYNC_BYTE_INC, NULL); if (A_FAILED(status)) { AR_DEBUG_PRINTF(ATH_DEBUG_ERR, ("DumpAR6KDevState : Failed to read register table (%d) \n",status)); return; } DevDumpRegisters(pDev,&procRegs,®s); if (pDev->GMboxInfo.pStateDumpCallback != NULL) { pDev->GMboxInfo.pStateDumpCallback(pDev->GMboxInfo.pProtocolContext); } /* dump any bus state at the HIF layer */ HIFConfigureDevice(pDev->HIFDevice,HIF_DEVICE_DEBUG_BUS_STATE,NULL,0); }