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| author | Yong Wang <yong.y.wang@intel.com> | 2010-10-04 10:37:02 +0000 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2010-10-07 15:03:43 -0700 |
| commit | b306df5e925bb584b2157f11f97c5eb20a13de4d (patch) | |
| tree | 10cf5276a242c69a57c73f53499ab049827ed0a1 /drivers/dma/intel_mid_dma.c | |
| parent | 53a61badf47e674fb43d73cd22f0f8065098ddf6 (diff) | |
| download | linux-b306df5e925bb584b2157f11f97c5eb20a13de4d.tar.gz linux-b306df5e925bb584b2157f11f97c5eb20a13de4d.tar.bz2 linux-b306df5e925bb584b2157f11f97c5eb20a13de4d.zip | |
intel_mid_dma: Allow IRQ sharing
intel_mid_dma driver allows interrupt sharing. Thus it needs
to check whether IRQ source is the DMA controller and return
the appropriate IRQ return.
Signed-off-by: Yong Wang <yong.y.wang@intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/dma/intel_mid_dma.c')
| -rw-r--r-- | drivers/dma/intel_mid_dma.c | 25 |
1 files changed, 14 insertions, 11 deletions
diff --git a/drivers/dma/intel_mid_dma.c b/drivers/dma/intel_mid_dma.c index 373396c462a0..c4b81387f0c6 100644 --- a/drivers/dma/intel_mid_dma.c +++ b/drivers/dma/intel_mid_dma.c @@ -817,9 +817,14 @@ static void dma_tasklet2(unsigned long data) static irqreturn_t intel_mid_dma_interrupt(int irq, void *data) { struct middma_device *mid = data; - u32 status; + u32 tfr_status, err_status; int call_tasklet = 0; + tfr_status = ioread32(mid->dma_base + RAW_TFR); + err_status = ioread32(mid->dma_base + RAW_ERR); + if (!tfr_status && !err_status) + return IRQ_NONE; + /*DMA Interrupt*/ pr_debug("MDMA:Got an interrupt on irq %d\n", irq); if (!mid) { @@ -827,19 +832,17 @@ static irqreturn_t intel_mid_dma_interrupt(int irq, void *data) return -EINVAL; } - status = ioread32(mid->dma_base + RAW_TFR); - pr_debug("MDMA: Status %x, Mask %x\n", status, mid->intr_mask); - status &= mid->intr_mask; - if (status) { + pr_debug("MDMA: Status %x, Mask %x\n", tfr_status, mid->intr_mask); + tfr_status &= mid->intr_mask; + if (tfr_status) { /*need to disable intr*/ - iowrite32((status << 8), mid->dma_base + MASK_TFR); - pr_debug("MDMA: Calling tasklet %x\n", status); + iowrite32((tfr_status << 8), mid->dma_base + MASK_TFR); + pr_debug("MDMA: Calling tasklet %x\n", tfr_status); call_tasklet = 1; } - status = ioread32(mid->dma_base + RAW_ERR); - status &= mid->intr_mask; - if (status) { - iowrite32(MASK_INTR_REG(status), mid->dma_base + MASK_ERR); + err_status &= mid->intr_mask; + if (err_status) { + iowrite32(MASK_INTR_REG(err_status), mid->dma_base + MASK_ERR); call_tasklet = 1; } if (call_tasklet) |