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Unified Diff: chromeos/drivers/ath6kl/htc2/AR6000/ar6k_events.c

Issue 646055: Atheros AR600x driver + build glue (Closed)
Patch Set: Created 10 years, 10 months ago
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Index: chromeos/drivers/ath6kl/htc2/AR6000/ar6k_events.c
diff --git a/chromeos/drivers/ath6kl/htc2/AR6000/ar6k_events.c b/chromeos/drivers/ath6kl/htc2/AR6000/ar6k_events.c
new file mode 100644
index 0000000000000000000000000000000000000000..a667a06da0c38ef74ed928a676a0c5e53bf4c3a5
--- /dev/null
+++ b/chromeos/drivers/ath6kl/htc2/AR6000/ar6k_events.c
@@ -0,0 +1,757 @@
+//------------------------------------------------------------------------------
+// <copyright file="ar6k_events.c" company="Atheros">
+// Copyright (c) 2007-2008 Atheros Corporation. All rights reserved.
+//
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License version 2 as
+// published by the Free Software Foundation;
+//
+// Software distributed under the License is distributed on an "AS
+// IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
+// implied. See the License for the specific language governing
+// rights and limitations under the License.
+//
+//
+//------------------------------------------------------------------------------
+//==============================================================================
+// 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 "AR6002/hw2.0/hw/mbox_host_reg.h"
+#include "a_osapi.h"
+#include "../htc_debug.h"
+#include "hif.h"
+#include "htc_packet.h"
+#include "ar6k.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%X) , Status: %d \n",
+ (A_UINT32)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%X)\n", (A_UINT32)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%X)\n", (A_UINT32)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%X)\n", (A_UINT32)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 */
+ if (!(*pASyncProcessing) && (pDev->RecheckIRQStatusCnt == 0)) {
+ 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%X)\n", (A_UINT32)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(&regs,&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,&regs);
+
+ 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);
+
+}
+
+
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