[PATCH 17/19] coresight: etm4x: Refactor probing routine
Mike Leach
mike.leach at linaro.org
Fri Sep 18 11:35:48 EDT 2020
Reviewed-by: Mike Leach <mike.leach at linaro.org>
On Fri, 11 Sep 2020 at 09:41, Suzuki K Poulose <suzuki.poulose at arm.com> wrote:
>
> CoreSight ETM with system register access may not have a
> memory mapped i/o access. Refactor the ETM specific probing
> into a common routine to allow reusing the code for such ETMs.
>
> Cc: Mathieu Poirier <mathieu.poirier at linaro.org>
> Cc: Mike Leach <mike.leach at linaro.org>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose at arm.com>
> ---
> drivers/hwtracing/coresight/coresight-etm4x.c | 38 ++++++++++++-------
> 1 file changed, 24 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/hwtracing/coresight/coresight-etm4x.c b/drivers/hwtracing/coresight/coresight-etm4x.c
> index dc5ac171db35..7d5f942c2108 100644
> --- a/drivers/hwtracing/coresight/coresight-etm4x.c
> +++ b/drivers/hwtracing/coresight/coresight-etm4x.c
> @@ -1596,14 +1596,11 @@ static void __init etm4_pm_clear(void)
> }
> }
>
> -static int etm4_probe(struct amba_device *adev, const struct amba_id *id)
> +static int etm4_probe(struct device *dev, void __iomem *base)
> {
> int ret;
> - void __iomem *base;
> - struct device *dev = &adev->dev;
> struct coresight_platform_data *pdata = NULL;
> struct etmv4_drvdata *drvdata;
> - struct resource *res = &adev->res;
> struct coresight_desc desc = { 0 };
> struct etm_init_arg init_arg = { 0 };
>
> @@ -1627,11 +1624,6 @@ static int etm4_probe(struct amba_device *adev, const struct amba_id *id)
> if (fwnode_property_present(dev_fwnode(dev), "qcom,skip-power-up"))
> drvdata->skip_power_up = true;
>
> - /* Validity for the resource is already checked by the AMBA core */
> - base = devm_ioremap_resource(dev, res);
> - if (IS_ERR(base))
> - return PTR_ERR(base);
> -
> drvdata->base = base;
>
> spin_lock_init(&drvdata->spinlock);
> @@ -1665,7 +1657,7 @@ static int etm4_probe(struct amba_device *adev, const struct amba_id *id)
> ret = PTR_ERR(pdata);
> goto err_arch_supported;
> }
> - adev->dev.platform_data = pdata;
> + dev->platform_data = pdata;
>
> desc.type = CORESIGHT_DEV_TYPE_SOURCE;
> desc.subtype.source_subtype = CORESIGHT_DEV_SUBTYPE_SOURCE_PROC;
> @@ -1685,7 +1677,6 @@ static int etm4_probe(struct amba_device *adev, const struct amba_id *id)
> goto err_arch_supported;
> }
>
> - pm_runtime_put(&adev->dev);
> dev_info(&drvdata->csdev->dev, "CPU%d: ETM v%d.%d initialized\n",
> drvdata->cpu, etm_devarch_arch(drvdata->arch),
> etm_devarch_rev(drvdata->arch));
> @@ -1702,6 +1693,25 @@ static int etm4_probe(struct amba_device *adev, const struct amba_id *id)
> return ret;
> }
>
> +static int etm4_probe_amba(struct amba_device *adev, const struct amba_id *id)
> +{
> + void __iomem *base;
> + struct device *dev = &adev->dev;
> + struct resource *res = &adev->res;
> + int ret;
> +
> + /* Validity for the resource is already checked by the AMBA core */
> + base = devm_ioremap_resource(dev, res);
> + if (IS_ERR(base))
> + return PTR_ERR(base);
> +
> + ret = etm4_probe(dev, base);
> + if (!ret)
> + pm_runtime_put(&adev->dev);
> +
> + return ret;
> +}
> +
> static struct amba_cs_uci_id uci_id_etm4[] = {
> {
> /* ETMv4 UCI data */
> @@ -1730,12 +1740,12 @@ static const struct amba_id etm4_ids[] = {
> {},
> };
>
> -static struct amba_driver etm4x_driver = {
> +static struct amba_driver etm4x_amba_driver = {
> .drv = {
> .name = "coresight-etm4x",
> .suppress_bind_attrs = true,
> },
> - .probe = etm4_probe,
> + .probe = etm4_probe_amba,
> .id_table = etm4_ids,
> };
>
> @@ -1749,7 +1759,7 @@ static int __init etm4x_init(void)
> if (ret)
> return ret;
>
> - ret = amba_driver_register(&etm4x_driver);
> + ret = amba_driver_register(&etm4x_amba_driver);
> if (ret) {
> pr_err("Error registering etm4x driver\n");
> etm4_pm_clear();
> --
> 2.24.1
>
--
Mike Leach
Principal Engineer, ARM Ltd.
Manchester Design Centre. UK
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