From 1c62979ed29a8e2bf9fbe1db101c81a0089676f8 Mon Sep 17 00:00:00 2001 From: Zhang Wei Date: Thu, 17 Apr 2008 20:17:25 -0700 Subject: 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 Signed-off-by; Andrew Morton Signed-off-by: Dan Williams --- drivers/dma/fsldma.c | 26 +++++++++++++++++++++----- 1 file changed, 21 insertions(+), 5 deletions(-) (limited to 'drivers/dma') diff --git a/drivers/dma/fsldma.c b/drivers/dma/fsldma.c index 9854ebbaee3..d8ae18dbf1a 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); -- cgit v1.2.3