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authorZhang Wei <wei.zhang@freescale.com>2008-04-17 23:17:25 -0400
committerDan Williams <dan.j.williams@intel.com>2008-04-17 16:22:16 -0400
commit1c62979ed29a8e2bf9fbe1db101c81a0089676f8 (patch)
treec652c60d180ec4c5f6fbe17eabeed7b1ac5b601b /drivers
parent411e23dbe9c5867045f34ba83ee84b31b5b9950c (diff)
fsldma: Split the MPC83xx event from MPC85xx and refine irq codes.
Split MPC83xx EOCDI event from MPC85xx EOLNI event, which is also need to update cookie and start the next transfer. The DMA channel irq handler function code is refined. The patch is tested on MPC8377MDS board. Signed-off-by: Zhang Wei <wei.zhang@freescale.com> Signed-off-by; Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/dma/fsldma.c26
1 files changed, 21 insertions, 5 deletions
diff --git a/drivers/dma/fsldma.c b/drivers/dma/fsldma.c
index 9854ebbaee31..d8ae18dbf1a7 100644
--- a/drivers/dma/fsldma.c
+++ b/drivers/dma/fsldma.c
@@ -696,6 +696,8 @@ static irqreturn_t fsl_dma_chan_do_interrupt(int irq, void *data)
696{ 696{
697 struct fsl_dma_chan *fsl_chan = (struct fsl_dma_chan *)data; 697 struct fsl_dma_chan *fsl_chan = (struct fsl_dma_chan *)data;
698 u32 stat; 698 u32 stat;
699 int update_cookie = 0;
700 int xfer_ld_q = 0;
699 701
700 stat = get_sr(fsl_chan); 702 stat = get_sr(fsl_chan);
701 dev_dbg(fsl_chan->dev, "event: channel %d, stat = 0x%x\n", 703 dev_dbg(fsl_chan->dev, "event: channel %d, stat = 0x%x\n",
@@ -720,8 +722,8 @@ static irqreturn_t fsl_dma_chan_do_interrupt(int irq, void *data)
720 * Now, update the completed cookie, and continue the 722 * Now, update the completed cookie, and continue the
721 * next uncompleted transfer. 723 * next uncompleted transfer.
722 */ 724 */
723 fsl_dma_update_completed_cookie(fsl_chan); 725 update_cookie = 1;
724 fsl_chan_xfer_ld_queue(fsl_chan); 726 xfer_ld_q = 1;
725 } 727 }
726 stat &= ~FSL_DMA_SR_PE; 728 stat &= ~FSL_DMA_SR_PE;
727 } 729 }
@@ -734,19 +736,33 @@ static irqreturn_t fsl_dma_chan_do_interrupt(int irq, void *data)
734 dev_dbg(fsl_chan->dev, "event: clndar %p, nlndar %p\n", 736 dev_dbg(fsl_chan->dev, "event: clndar %p, nlndar %p\n",
735 (void *)get_cdar(fsl_chan), (void *)get_ndar(fsl_chan)); 737 (void *)get_cdar(fsl_chan), (void *)get_ndar(fsl_chan));
736 stat &= ~FSL_DMA_SR_EOSI; 738 stat &= ~FSL_DMA_SR_EOSI;
737 fsl_dma_update_completed_cookie(fsl_chan); 739 update_cookie = 1;
740 }
741
742 /* For MPC8349, EOCDI event need to update cookie
743 * and start the next transfer if it exist.
744 */
745 if (stat & FSL_DMA_SR_EOCDI) {
746 dev_dbg(fsl_chan->dev, "event: End-of-Chain link INT\n");
747 stat &= ~FSL_DMA_SR_EOCDI;
748 update_cookie = 1;
749 xfer_ld_q = 1;
738 } 750 }
739 751
740 /* If it current transfer is the end-of-transfer, 752 /* If it current transfer is the end-of-transfer,
741 * we should clear the Channel Start bit for 753 * we should clear the Channel Start bit for
742 * prepare next transfer. 754 * prepare next transfer.
743 */ 755 */
744 if (stat & (FSL_DMA_SR_EOLNI | FSL_DMA_SR_EOCDI)) { 756 if (stat & FSL_DMA_SR_EOLNI) {
745 dev_dbg(fsl_chan->dev, "event: End-of-link INT\n"); 757 dev_dbg(fsl_chan->dev, "event: End-of-link INT\n");
746 stat &= ~FSL_DMA_SR_EOLNI; 758 stat &= ~FSL_DMA_SR_EOLNI;
747 fsl_chan_xfer_ld_queue(fsl_chan); 759 xfer_ld_q = 1;
748 } 760 }
749 761
762 if (update_cookie)
763 fsl_dma_update_completed_cookie(fsl_chan);
764 if (xfer_ld_q)
765 fsl_chan_xfer_ld_queue(fsl_chan);
750 if (stat) 766 if (stat)
751 dev_dbg(fsl_chan->dev, "event: unhandled sr 0x%02x\n", 767 dev_dbg(fsl_chan->dev, "event: unhandled sr 0x%02x\n",
752 stat); 768 stat);