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: Mike Leach mike.leach@linaro.org Reviewed-by: Mathieu Poirier mathieu.poirier@linaro.org Signed-off-by: Suzuki K Poulose suzuki.poulose@arm.com --- .../coresight/coresight-etm4x-core.c | 48 +++++++++++-------- 1 file changed, 29 insertions(+), 19 deletions(-)
diff --git a/drivers/hwtracing/coresight/coresight-etm4x-core.c b/drivers/hwtracing/coresight/coresight-etm4x-core.c index 5cbea9c27f58..4467327af889 100644 --- a/drivers/hwtracing/coresight/coresight-etm4x-core.c +++ b/drivers/hwtracing/coresight/coresight-etm4x-core.c @@ -1610,14 +1610,11 @@ static void 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 etm4_init_arg init_arg = { 0 };
@@ -1641,11 +1638,6 @@ 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); @@ -1675,7 +1667,7 @@ static int etm4_probe(struct amba_device *adev, const struct amba_id *id) if (IS_ERR(pdata)) return PTR_ERR(pdata);
- adev->dev.platform_data = pdata; + dev->platform_data = pdata;
desc.type = CORESIGHT_DEV_TYPE_SOURCE; desc.subtype.source_subtype = CORESIGHT_DEV_SUBTYPE_SOURCE_PROC; @@ -1695,7 +1687,6 @@ static int etm4_probe(struct amba_device *adev, const struct amba_id *id)
etmdrvdata[drvdata->cpu] = drvdata;
- pm_runtime_put(&adev->dev); dev_info(&drvdata->csdev->dev, "CPU%d: ETM v%d.%d initialized\n", drvdata->cpu, ETM_ARCH_MAJOR_VERSION(drvdata->arch), ETM_ARCH_MINOR_VERSION(drvdata->arch)); @@ -1708,6 +1699,25 @@ static int etm4_probe(struct amba_device *adev, const struct amba_id *id) return 0; }
+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 */ @@ -1724,15 +1734,15 @@ static void __exit clear_etmdrvdata(void *info) etmdrvdata[cpu] = NULL; }
-static int __exit etm4_remove(struct amba_device *adev) +static int __exit etm4_remove_amba(struct amba_device *adev) { struct etmv4_drvdata *drvdata = dev_get_drvdata(&adev->dev);
etm_perf_symlink(drvdata->csdev, false);
/* - * Taking hotplug lock here to avoid racing between etm4_remove and - * CPU hotplug call backs. + * Taking hotplug lock here to avoid racing between etm4_remove_amba() + * and CPU hotplug call backs. */ cpus_read_lock(); /* @@ -1772,14 +1782,14 @@ static const struct amba_id etm4_ids[] = {
MODULE_DEVICE_TABLE(amba, etm4_ids);
-static struct amba_driver etm4x_driver = { +static struct amba_driver etm4x_amba_driver = { .drv = { .name = "coresight-etm4x", .owner = THIS_MODULE, .suppress_bind_attrs = true, }, - .probe = etm4_probe, - .remove = etm4_remove, + .probe = etm4_probe_amba, + .remove = etm4_remove_amba, .id_table = etm4_ids, };
@@ -1793,7 +1803,7 @@ 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(); @@ -1804,7 +1814,7 @@ static int __init etm4x_init(void)
static void __exit etm4x_exit(void) { - amba_driver_unregister(&etm4x_driver); + amba_driver_unregister(&etm4x_amba_driver); etm4_pm_clear(); }