diff options
author | Gregory Nutt <gnutt@nuttx.org> | 2013-11-09 15:01:18 -0600 |
---|---|---|
committer | Gregory Nutt <gnutt@nuttx.org> | 2013-11-09 15:01:18 -0600 |
commit | 9e5b2df0167e8251e4dbb0d925796063fc28f887 (patch) | |
tree | e1b9f4a9483aaea3a758c703b03e7e75af472486 | |
parent | 813276dddc21b99a8d197a7064c94f92a10a15d1 (diff) | |
download | nuttx-9e5b2df0167e8251e4dbb0d925796063fc28f887.tar.gz nuttx-9e5b2df0167e8251e4dbb0d925796063fc28f887.tar.bz2 nuttx-9e5b2df0167e8251e4dbb0d925796063fc28f887.zip |
SAMA5 I2S: Try to chain as many DMAs together as possible
-rw-r--r-- | nuttx/arch/arm/src/sama5/sam_ssc.c | 214 |
1 files changed, 144 insertions, 70 deletions
diff --git a/nuttx/arch/arm/src/sama5/sam_ssc.c b/nuttx/arch/arm/src/sama5/sam_ssc.c index 686627b60..cdad95aaa 100644 --- a/nuttx/arch/arm/src/sama5/sam_ssc.c +++ b/nuttx/arch/arm/src/sama5/sam_ssc.c @@ -275,16 +275,16 @@ struct sam_ssc_s DMA_HANDLE rxdma; /* SSC RX DMA handle */ WDOG_ID rxdog; /* Watchdog that handles RX DMA timeouts */ sq_queue_t rxpend; /* A queue of pending RX transfers */ + sq_queue_t rxact; /* A queue of active RX transfers */ sq_queue_t rxdone; /* A queue of completed RX transfers */ - struct sam_buffer_s *rxact; /* The active RX transfer */ struct work_s rxwork; /* Supports worker thread RX operations */ #endif #ifdef SSC_HAVE_TX DMA_HANDLE txdma; /* SSC TX DMA handle */ WDOG_ID txdog; /* Watchdog that handles TX DMA timeouts */ sq_queue_t txpend; /* A queue of pending TX transfers */ + sq_queue_t txact; /* A queue of active TX transfers */ sq_queue_t txdone; /* A queue of completed TX transfers */ - struct sam_buffer_s *txact; /* The active TX transfer */ struct work_s txwork; /* Supports worker thread TX operations */ #endif @@ -1014,24 +1014,22 @@ static int ssc_rxdma_setup(struct sam_ssc_s *priv) struct sam_buffer_s *bfcontainer; uintptr_t paddr; uintptr_t maddr; + uint32_t timeout; + bool notimeout; int ret; /* If there is already an active transmission in progress, then bail * returning success. */ - if (priv->rxact != NULL) + if (!sq_empty(&priv->rxact)) { return OK; } - /* Remove the pending RX transfer at the head of the RX pending queue. */ - - bfcontainer = (struct sam_buffer_s *)sq_remfirst(&priv->rxpend); - /* If there are no pending transfer, then bail returning success */ - if (!bfcontainer) + if (sq_empty(&priv->rxpend)) { return OK; } @@ -1040,16 +1038,47 @@ static int ssc_rxdma_setup(struct sam_ssc_s *priv) ssc_rxdma_sampleinit(priv); - /* Physical address of the SSC RHR register and of the buffer location in - * RAM. - */ + /* Loop, adding each pending DMA */ + + timeout = 0; + notimeout = false; + + do + { + /* Remove the pending RX transfer at the head of the RX pending queue. */ + + bfcontainer = (struct sam_buffer_s *)sq_remfirst(&priv->rxpend); + + /* Physical address of the SSC RHR register and of the buffer location + * in RAM. + */ + + paddr = ssc_physregaddr(priv, SAM_SSC_RHR_OFFSET); + maddr = sam_physramaddr((uintptr_t)bfcontainer->buffer); + + /* Configure the RX DMA */ + + sam_dmarxsetup(priv->rxdma, paddr, maddr, bfcontainer->nbytes); + + /* Increment the DMA timeout */ - paddr = ssc_physregaddr(priv, SAM_SSC_RHR_OFFSET); - maddr = sam_physramaddr((uintptr_t)bfcontainer->buffer); + if (bfcontainer->timeout > 0) + { + timeout += timeout; + } + else + { + notimeout = true; + } + + /* Add the container to the list of active DMAs */ + + sq_addlast((sq_entry_t *)bfcontainer, &priv->rxact); + } + while (!sq_empty(&priv->rxpend)); - /* Configure the RX DMA */ + /* Sample DMA registers */ - sam_dmarxsetup(priv->rxdma, paddr, maddr, bfcontainer->nbytes); ssc_rxdma_sample(priv, DMA_AFTER_SETUP); /* Invalidate the data cache so that nothing gets flush into the @@ -1061,7 +1090,6 @@ static int ssc_rxdma_setup(struct sam_ssc_s *priv) /* Start the DMA, saving the container as the current active transfer */ - priv->rxact = bfcontainer; sam_dmastart(priv->rxdma, ssc_rxdma_callback, priv); ssc_rxdma_sample(priv, DMA_AFTER_START); @@ -1071,10 +1099,10 @@ static int ssc_rxdma_setup(struct sam_ssc_s *priv) /* Start a watchdog to catch DMA timeouts */ - if (priv->rxact->timeout > 0) + if (!notimeout) { - ret = wd_start(priv->rxdog, priv->rxact->timeout, - (wdentry_t)ssc_rxdma_timeout, 1, (uint32_t)priv); + ret = wd_start(priv->rxdog, timeout, (wdentry_t)ssc_rxdma_timeout, + 1, (uint32_t)priv); /* Check if we have successfully started the watchdog timer. Note * that we do nothing in the case of failure to start the timer. We @@ -1115,14 +1143,14 @@ static void ssc_rx_worker(FAR void *arg) DEBUGASSERT(priv); - /* When the transfer was started, the active buffer container was removed - * from the rxpend queue and saved in as rxact. We get here when the - * DMA if finished... either successfully, with a DMA error, or with a DMA + /* When the transfer was started, the active buffer containers were removed + * from the rxpend queue and saved in the rxact queue. We get here when the + * DMA is finished... either successfully, with a DMA error, or with a DMA * timeout. * - * In any case, the buffer container in rxact will be moved to the end - * of the rxdone queue and rxact will be nullified before this worker is - * started. + * In any case, the buffer containers in rxact will be moved to the end + * of the rxdone queue and rxact queue will be emptied before this worker + * is started. * * REVISIT: Normal DMA callback processing should restart the DMA * immediately to avoid audio artifacts at the boundaries between DMA @@ -1131,11 +1159,12 @@ static void ssc_rx_worker(FAR void *arg) * So we have to start the next DMA here. */ - i2svdbg("txact=%p rxdone.head=%p\n", priv->txact, priv->txdone.head); + i2svdbg("rxact.head=%p rxdone.head=%p\n", + priv->rxact.head, priv->rxdone.head); /* Check if the DMA is IDLE */ - if (priv->rxact == NULL) + if (sq_empty(&priv->rxact)) { #ifdef CONFIG_SAMA5_SSC_DMADEBUG bfcontainer = (struct sam_buffer_s *)sq_peek(&priv->rxdone); @@ -1206,22 +1235,31 @@ static void ssc_rx_worker(FAR void *arg) #ifdef SSC_HAVE_RX static void ssc_rx_schedule(struct sam_ssc_s *priv, int result) { + struct sam_buffer_s *bfcontainer; int ret; - /* Upon entry, the transfer that just complete is the one at head at - * priv->rxact. It does not reside in any queue. + /* Upon entry, the transfer that just complete is the one at tail of the + * priv->rxact queue. */ - DEBUGASSERT(priv->rxact != NULL); + DEBUGASSERT(!sq_empty(&priv->rxact)); - /* Report the result of the transfer */ + /* Move all entries from the rxact queue to the rxdone queue */ + + while (!sq_empty(&priv->rxact)) + { + /* Remove the next buffer container from the rxact list */ - priv->rxact->result = result; + bfcontainer = (struct sam_buffer_s *)sq_remfirst(&priv->rxact); - /* Add the completed buffer to the tail of the txdone queue */ + /* Report the result of the transfer */ - sq_addlast((sq_entry_t *)priv->rxact, &priv->rxdone); - priv->rxact = NULL; + bfcontainer->result = result; + + /* Add the completed buffer container to the tail of the rxdone queue */ + + sq_addlast((sq_entry_t *)bfcontainer, &priv->rxdone); + } /* If the worker has completed running, then reschedule the working thread. * REVISIT: There may be a race condition here. @@ -1342,24 +1380,22 @@ static int ssc_txdma_setup(struct sam_ssc_s *priv) struct sam_buffer_s *bfcontainer; uintptr_t paddr; uintptr_t maddr; + uint32_t timeout; + bool notimeout; int ret; /* If there is already an active transmission in progress, then bail * returning success. */ - if (priv->txact) + if (!sq_empty(&priv->txact)) { return OK; } - /* Remove the pending TX transfer at the head of the TX pending queue. */ - - bfcontainer = (struct sam_buffer_s *)sq_remfirst(&priv->txpend); - /* If there are no pending transfer, then bail returning success */ - if (!bfcontainer) + if (sq_empty(&priv->txpend)) { return OK; } @@ -1368,16 +1404,48 @@ static int ssc_txdma_setup(struct sam_ssc_s *priv) ssc_txdma_sampleinit(priv); - /* Physical address of the SSC THR register and of the buffer location in - * RAM. - */ + /* Loop, adding each pending DMA */ + + timeout = 0; + notimeout = false; + + do + { + /* Remove the pending TX transfer at the head of the TX pending queue. */ + + bfcontainer = (struct sam_buffer_s *)sq_remfirst(&priv->txpend); + + /* Physical address of the SSC THR register and of the buffer location + * in + * RAM. + */ + + paddr = ssc_physregaddr(priv, SAM_SSC_THR_OFFSET); + maddr = sam_physramaddr((uintptr_t)bfcontainer->buffer); + + /* Configure the TX DMA */ + + sam_dmatxsetup(priv->txdma, paddr, maddr, bfcontainer->nbytes); + + /* Increment the DMA timeout */ - paddr = ssc_physregaddr(priv, SAM_SSC_THR_OFFSET); - maddr = sam_physramaddr((uintptr_t)bfcontainer->buffer); + if (bfcontainer->timeout > 0) + { + timeout += timeout; + } + else + { + notimeout = true; + } - /* Configure the TX DMA */ + /* Add the container to the list of active DMAs */ - sam_dmatxsetup(priv->txdma, paddr, maddr, bfcontainer->nbytes); + sq_addlast((sq_entry_t *)bfcontainer, &priv->txact); + } + while (!sq_empty(&priv->txpend)); + + /* Sample DMA registers */ + ssc_txdma_sample(priv, DMA_AFTER_SETUP); /* Flush the data cache so that everything is in the physical memory @@ -1389,7 +1457,6 @@ static int ssc_txdma_setup(struct sam_ssc_s *priv) /* Start the DMA, saving the container as the current active transfer */ - priv->txact = bfcontainer; sam_dmastart(priv->txdma, ssc_txdma_callback, priv); ssc_txdma_sample(priv, DMA_AFTER_START); @@ -1399,10 +1466,10 @@ static int ssc_txdma_setup(struct sam_ssc_s *priv) /* Start a watchdog to catch DMA timeouts */ - if (priv->txact->timeout > 0) + if (!notimeout) { - ret = wd_start(priv->txdog, priv->txact->timeout, - (wdentry_t)ssc_txdma_timeout, 1, (uint32_t)priv); + ret = wd_start(priv->txdog, timeout, (wdentry_t)ssc_txdma_timeout, + 1, (uint32_t)priv); /* Check if we have successfully started the watchdog timer. Note * that we do nothing in the case of failure to start the timer. We @@ -1443,13 +1510,13 @@ static void ssc_tx_worker(FAR void *arg) DEBUGASSERT(priv); - /* When the transfer was started, the active buffer container was removed - * from the txpend queue and saved in as txact. We get here when the - * DMA if finished... either successfully, with a DMA error, or with a DMA + /* When the transfer was started, the active buffer containers were removed + * from the txpend queue and saved in the txact queue. We get here when the + * DMA is finished... either successfully, with a DMA error, or with a DMA * timeout. * - * In any case, the buffer container in txact will be moved to the end - * of the txdone queue and txact will be nullified before this worker is + * In any case, the buffer containers in txact will be moved to the end + * of the txdone queue and txact will be emptied before this worker is * started. * * REVISIT: Normal DMA callback processing should restart the DMA @@ -1459,11 +1526,12 @@ static void ssc_tx_worker(FAR void *arg) * So we have to start the next DMA here. */ - i2svdbg("txact=%p txdone.head=%p\n", priv->txact, priv->txdone.head); + i2svdbg("txact.head=%p txdone.head=%p\n", + priv->txact.head, priv->txdone.head); /* Check if the DMA is IDLE */ - if (priv->txact == NULL) + if (sq_empty(&priv->txact)) { #ifdef CONFIG_SAMA5_SSC_DMADEBUG bfcontainer = (struct sam_buffer_s *)sq_peek(&priv->txdone); @@ -1475,9 +1543,6 @@ static void ssc_tx_worker(FAR void *arg) } #endif - /* Dump the DMA registers only if the DMA is IDLE */ - - /* Then start the next DMA. This must be done with interrupts * disabled. */ @@ -1538,22 +1603,31 @@ static void ssc_tx_worker(FAR void *arg) #ifdef SSC_HAVE_TX static void ssc_tx_schedule(struct sam_ssc_s *priv, int result) { + struct sam_buffer_s *bfcontainer; int ret; - /* Upon entry, the transfer that just complete is the one at head at - * priv->txact. It does not reside in any queue. + /* Upon entry, the transfer that just completed is the one at head at + * end of the priv->txact queue. */ - DEBUGASSERT(priv->txact != NULL); + DEBUGASSERT(!sq_empty(&priv->txact)); - /* Report the result of the transfer */ + /* Move all entries from the txact queue to the txdone queue */ + + while (!sq_empty(&priv->txact)) + { + /* Remove the next buffer container from the txact list */ - priv->txact->result = result; + bfcontainer = (struct sam_buffer_s *)sq_remfirst(&priv->txact); - /* Add the completed buffer to the tail of the txdone queue */ + /* Report the result of the transfer */ - sq_addlast((sq_entry_t *)priv->txact, &priv->txdone); - priv->txact = NULL; + bfcontainer->result = result; + + /* Add the completed buffer container to the tail of the txdone queue */ + + sq_addlast((sq_entry_t *)bfcontainer, &priv->txdone); + } /* If the worker has completed running, then reschedule the working thread. * REVISIT: There may be a race condition here. |