diff options
author | Suzuki K Poulose <suzuki.poulose@arm.com> | 2021-02-01 11:13:45 -0700 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-02-04 17:00:34 +0100 |
commit | c23bc382ef0ec9e91ef7bb689755bddbddb0fb25 (patch) | |
tree | 72eb4cc393f39ffe33048bae54fbc25e62f65e7a /drivers/hwtracing | |
parent | dc1747a716fe91b88691cc8bd35f986a6774fc47 (diff) | |
download | linux-c23bc382ef0ec9e91ef7bb689755bddbddb0fb25.tar.gz linux-c23bc382ef0ec9e91ef7bb689755bddbddb0fb25.tar.bz2 linux-c23bc382ef0ec9e91ef7bb689755bddbddb0fb25.zip |
coresight: etm4x: Refactor probing routine
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.
Link: https://lore.kernel.org/r/20210110224850.1880240-24-suzuki.poulose@arm.com
Cc: Mike Leach <mike.leach@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Link: https://lore.kernel.org/r/20210201181351.1475223-26-mathieu.poirier@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/hwtracing')
-rw-r--r-- | drivers/hwtracing/coresight/coresight-etm4x-core.c | 62 |
1 files changed, 39 insertions, 23 deletions
diff --git a/drivers/hwtracing/coresight/coresight-etm4x-core.c b/drivers/hwtracing/coresight/coresight-etm4x-core.c index 48d8e99e31eb..c3e458af618a 100644 --- a/drivers/hwtracing/coresight/coresight-etm4x-core.c +++ b/drivers/hwtracing/coresight/coresight-etm4x-core.c @@ -1708,14 +1708,11 @@ 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, u32 etm_pid) { 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 }; @@ -1739,11 +1736,6 @@ 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); @@ -1773,7 +1765,7 @@ 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; @@ -1793,7 +1785,6 @@ 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)); @@ -1803,11 +1794,30 @@ static int etm4_probe(struct amba_device *adev, const struct amba_id *id) drvdata->boot_enable = true; } - etm4_check_arch_features(drvdata, id->id); + etm4_check_arch_features(drvdata, etm_pid); 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, id->id); + if (!ret) + pm_runtime_put(&adev->dev); + + return ret; +} + static struct amba_cs_uci_id uci_id_etm4[] = { { /* ETMv4 UCI data */ @@ -1824,15 +1834,12 @@ static void clear_etmdrvdata(void *info) etmdrvdata[cpu] = NULL; } -static int etm4_remove(struct amba_device *adev) +static int __exit etm4_remove_dev(struct etmv4_drvdata *drvdata) { - 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_dev() + * and CPU hotplug call backs. */ cpus_read_lock(); /* @@ -1851,6 +1858,15 @@ static int etm4_remove(struct amba_device *adev) return 0; } +static int __exit etm4_remove_amba(struct amba_device *adev) +{ + struct etmv4_drvdata *drvdata = dev_get_drvdata(&adev->dev); + + if (drvdata) + return etm4_remove_dev(drvdata); + return 0; +} + static const struct amba_id etm4_ids[] = { CS_AMBA_ID(0x000bb95d), /* Cortex-A53 */ CS_AMBA_ID(0x000bb95e), /* Cortex-A57 */ @@ -1874,14 +1890,14 @@ 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, }; @@ -1895,7 +1911,7 @@ 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(); @@ -1906,7 +1922,7 @@ 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(); } |