On 12/18/2012 01:19 PM, [email protected] wrote:
> From: Pratik Patel <[email protected]>
>
> This driver manages CoreSight ETB (Embedded Trace Buffer) which
> acts as a circular buffer sink collecting generated trace data.
>
> Signed-off-by: Pratik Patel <[email protected]>
> ---
> drivers/coresight/Makefile | 2 +-
> drivers/coresight/coresight-etb.c | 467
> +++++++++++++++++++++++++++++++++++++
> 2 files changed, 468 insertions(+), 1 deletions(-)
[snip]
> +static int __devinit etb_probe(struct platform_device *pdev)
> +{
> + int ret;
> + struct device *dev = &pdev->dev;
> + struct coresight_platform_data *pdata;
> + struct etb_drvdata *drvdata;
> + struct resource *res;
> + struct coresight_desc *desc;
> +
> + if (pdev->dev.of_node) {
> + pdata = of_get_coresight_platform_data(dev, pdev->dev.of_node);
> + if (IS_ERR(pdata))
> + return PTR_ERR(pdata);
> + pdev->dev.platform_data = pdata;
> + }
> +
> + drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
> + if (!drvdata)
> + return -ENOMEM;
> + drvdata->dev = &pdev->dev;
> + platform_set_drvdata(pdev, drvdata);
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + if (!res)
> + return -ENODEV;
> +
> + drvdata->base = devm_ioremap(dev, res->start, resource_size(res));
> + if (!drvdata->base)
> + return -ENOMEM;
> +
> + spin_lock_init(&drvdata->spinlock);
> +
> + drvdata->clk = devm_clk_get(dev, "core_clk");
> + if (IS_ERR(drvdata->clk))
> + return PTR_ERR(drvdata->clk);
> +
> + ret = clk_set_rate(drvdata->clk, CORESIGHT_CLK_RATE_TRACE);
> + if (ret)
> + return ret;
> +
> + drvdata->buf = devm_kzalloc(dev, ETB_SIZE_WORDS * BYTES_PER_WORD,
> + GFP_KERNEL);
> + if (!drvdata->buf)
> + return -ENOMEM;
> +
> + desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL);
> + if (!desc)
> + return -ENOMEM;
> + desc->type = CORESIGHT_DEV_TYPE_SINK;
> + desc->subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_BUFFER;
Can a source be directly connected to a sink or do you need to have a
link in between?
The reason, I ask is because on some Cortex-A8 devices we have ETM
directly connected to ETB and there is no link per-se to configure.
Cheers
Jon
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