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authorZhang Wei <wei.zhang@freescale.com>2008-04-18 07:17:25 +0400
committerDan Williams <dan.j.williams@intel.com>2008-04-18 00:22:16 +0400
commit1c62979ed29a8e2bf9fbe1db101c81a0089676f8 (patch)
treec652c60d180ec4c5f6fbe17eabeed7b1ac5b601b /drivers/dma
parent411e23dbe9c5867045f34ba83ee84b31b5b9950c (diff)
downloadlinux-1c62979ed29a8e2bf9fbe1db101c81a0089676f8.tar.xz
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/dma')
-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)
{
struct fsl_dma_chan *fsl_chan = (struct fsl_dma_chan *)data;
u32 stat;
+ int update_cookie = 0;
+ int xfer_ld_q = 0;
stat = get_sr(fsl_chan);
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)
* Now, update the completed cookie, and continue the
* next uncompleted transfer.
*/
- fsl_dma_update_completed_cookie(fsl_chan);
- fsl_chan_xfer_ld_queue(fsl_chan);
+ update_cookie = 1;
+ xfer_ld_q = 1;
}
stat &= ~FSL_DMA_SR_PE;
}
@@ -734,19 +736,33 @@ static irqreturn_t fsl_dma_chan_do_interrupt(int irq, void *data)
dev_dbg(fsl_chan->dev, "event: clndar %p, nlndar %p\n",
(void *)get_cdar(fsl_chan), (void *)get_ndar(fsl_chan));
stat &= ~FSL_DMA_SR_EOSI;
- fsl_dma_update_completed_cookie(fsl_chan);
+ update_cookie = 1;
+ }
+
+ /* For MPC8349, EOCDI event need to update cookie
+ * and start the next transfer if it exist.
+ */
+ if (stat & FSL_DMA_SR_EOCDI) {
+ dev_dbg(fsl_chan->dev, "event: End-of-Chain link INT\n");
+ stat &= ~FSL_DMA_SR_EOCDI;
+ update_cookie = 1;
+ xfer_ld_q = 1;
}
/* If it current transfer is the end-of-transfer,
* we should clear the Channel Start bit for
* prepare next transfer.
*/
- if (stat & (FSL_DMA_SR_EOLNI | FSL_DMA_SR_EOCDI)) {
+ if (stat & FSL_DMA_SR_EOLNI) {
dev_dbg(fsl_chan->dev, "event: End-of-link INT\n");
stat &= ~FSL_DMA_SR_EOLNI;
- fsl_chan_xfer_ld_queue(fsl_chan);
+ xfer_ld_q = 1;
}
+ if (update_cookie)
+ fsl_dma_update_completed_cookie(fsl_chan);
+ if (xfer_ld_q)
+ fsl_chan_xfer_ld_queue(fsl_chan);
if (stat)
dev_dbg(fsl_chan->dev, "event: unhandled sr 0x%02x\n",
stat);