| Message ID | 20180116190236.14558-5-srinivas.kandagatla@linaro.org |
|---|---|
| State | New |
| Headers | show |
| Series | [1/4] dmaengine: qcom: bam_dma: make bam clk optional | expand |
On Tue, Jan 16, 2018 at 07:02:36PM +0000, srinivas.kandagatla@linaro.org wrote: > From: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> > > When Linux is master of BAM, it can directly read registers to know number > of supported execution enviroments, however when its remotely controlled > reading these registers would trigger a crash if the BAM is not yet > intialized/powered up on the remote side. > > This patch adds new binding num-ees to specify supported number of > Execution Environments when BAM is remotely controlled. > > Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> > --- > Documentation/devicetree/bindings/dma/qcom_bam_dma.txt | 2 ++ > drivers/dma/qcom/bam_dma.c | 15 ++++++++++++--- > 2 files changed, 14 insertions(+), 3 deletions(-) The correct split is the binding changes in 1 patch. Driver changes separate. > > diff --git a/Documentation/devicetree/bindings/dma/qcom_bam_dma.txt b/Documentation/devicetree/bindings/dma/qcom_bam_dma.txt > index aa6822cbb230..f0d10c2b393e 100644 > --- a/Documentation/devicetree/bindings/dma/qcom_bam_dma.txt > +++ b/Documentation/devicetree/bindings/dma/qcom_bam_dma.txt > @@ -17,6 +17,8 @@ Required properties: > remote proccessor i.e. execution environment. > - num-channels : optional, indicates supported number of DMA channels in a > remotely controlled bam. > +- num-ees : optional, indicates supported number of Execution Environments in a > + remotely controlled bam. This one needs a vendor prefix as it is not a common property. > > Example: > -- To unsubscribe from this list: send the line "unsubscribe linux-arm-msm" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/Documentation/devicetree/bindings/dma/qcom_bam_dma.txt b/Documentation/devicetree/bindings/dma/qcom_bam_dma.txt index aa6822cbb230..f0d10c2b393e 100644 --- a/Documentation/devicetree/bindings/dma/qcom_bam_dma.txt +++ b/Documentation/devicetree/bindings/dma/qcom_bam_dma.txt @@ -17,6 +17,8 @@ Required properties: remote proccessor i.e. execution environment. - num-channels : optional, indicates supported number of DMA channels in a remotely controlled bam. +- num-ees : optional, indicates supported number of Execution Environments in a + remotely controlled bam. Example: diff --git a/drivers/dma/qcom/bam_dma.c b/drivers/dma/qcom/bam_dma.c index bbbb755d7549..7a8727271d60 100644 --- a/drivers/dma/qcom/bam_dma.c +++ b/drivers/dma/qcom/bam_dma.c @@ -387,6 +387,7 @@ struct bam_device { struct device_dma_parameters dma_parms; struct bam_chan *channels; u32 num_channels; + u32 num_ees; /* execution environment ID, from DT */ u32 ee; @@ -1079,11 +1080,14 @@ static int bam_init(struct bam_device *bdev) u32 val; /* read revision and configuration information */ - val = readl_relaxed(bam_addr(bdev, 0, BAM_REVISION)) >> NUM_EES_SHIFT; - val &= NUM_EES_MASK; + if (!bdev->num_ees) { + val = readl_relaxed(bam_addr(bdev, 0, BAM_REVISION)) >> NUM_EES_SHIFT; + val &= NUM_EES_MASK; + bdev->num_ees = val; + } /* check that configured EE is within range */ - if (bdev->ee >= val) + if (bdev->ee >= bdev->num_ees) return -EINVAL; if (!bdev->num_channels) { @@ -1189,6 +1193,11 @@ static int bam_dma_probe(struct platform_device *pdev) &bdev->num_channels); if (ret) dev_err(bdev->dev, "num-channels unspecified in dt\n"); + + ret = of_property_read_u32(pdev->dev.of_node, "num-ees", + &bdev->num_ees); + if (ret) + dev_err(bdev->dev, "num-ees unspecified in dt\n"); } bdev->bamclk = devm_clk_get(bdev->dev, "bam_clk");