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dmaengine: ste_dma40: Fetch disabled channels from DT
Some platforms have channels which are not available for normal use. This information is currently passed though platform data in internal BSP kernels. Once those platforms land, they'll need to configure them appropriately, so we may as well add the infrastructure. Cc: Dan Williams <djbw@fb.com> Cc: Per Forlin <per.forlin@stericsson.com> Cc: Rabin Vincent <rabin@rab.in> Acked-by: Vinod Koul <vinod.koul@intel.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Lee Jones <lee.jones@linaro.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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2 changed files with 18 additions and 1 deletions
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@ -11,6 +11,7 @@ Required properties:
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Optional properties:
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- dma-channels: Number of channels supported by hardware - if not present
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the driver will attempt to obtain the information from H/W
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- disabled-channels: Channels which can not be used
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Example:
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@ -23,6 +24,7 @@ Example:
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#dma-cells = <2>;
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memcpy-channels = <56 57 58 59 60>;
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disabled-channels = <12>;
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dma-channels = <8>;
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};
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@ -3482,7 +3482,7 @@ static int __init d40_of_probe(struct platform_device *pdev,
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struct device_node *np)
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{
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struct stedma40_platform_data *pdata;
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int num_phy = 0, num_memcpy = 0;
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int num_phy = 0, num_memcpy = 0, num_disabled = 0;
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const const __be32 *list;
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pdata = devm_kzalloc(&pdev->dev,
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@ -3511,6 +3511,21 @@ static int __init d40_of_probe(struct platform_device *pdev,
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dma40_memcpy_channels,
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num_memcpy);
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list = of_get_property(np, "disabled-channels", &num_disabled);
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num_disabled /= sizeof(*list);
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if (num_disabled > STEDMA40_MAX_PHYS || num_disabled < 0) {
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d40_err(&pdev->dev,
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"Invalid number of disabled channels specified (%d)\n",
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num_disabled);
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return -EINVAL;
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}
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of_property_read_u32_array(np, "disabled-channels",
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pdata->disabled_channels,
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num_disabled);
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pdata->disabled_channels[num_disabled] = -1;
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pdev->dev.platform_data = pdata;
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return 0;
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