Add support for devices with system instruction access only. They don't have a memory mapped interface and thus are not AMBA devices.
Cc: Mathieu Poirier mathieu.poirier@linaro.org Cc: Mike Leach mike.leach@linaro.org Signed-off-by: Suzuki K Poulose suzuki.poulose@arm.com --- drivers/hwtracing/coresight/coresight-etm4x.c | 42 ++++++++++++++++++- 1 file changed, 40 insertions(+), 2 deletions(-)
diff --git a/drivers/hwtracing/coresight/coresight-etm4x.c b/drivers/hwtracing/coresight/coresight-etm4x.c index 7d5f942c2108..212713ffa37e 100644 --- a/drivers/hwtracing/coresight/coresight-etm4x.c +++ b/drivers/hwtracing/coresight/coresight-etm4x.c @@ -26,6 +26,7 @@ #include <linux/seq_file.h> #include <linux/uaccess.h> #include <linux/perf_event.h> +#include <linux/platform_device.h> #include <linux/pm_runtime.h> #include <linux/property.h> #include <asm/sections.h> @@ -1712,6 +1713,20 @@ static int etm4_probe_amba(struct amba_device *adev, const struct amba_id *id) return ret; }
+static int etm4_probe_platform_dev(struct platform_device *pdev) +{ + int ret; + + pm_runtime_get_noresume(&pdev->dev); + pm_runtime_set_active(&pdev->dev); + pm_runtime_enable(&pdev->dev); + + ret = etm4_probe(&pdev->dev, NULL); + + pm_runtime_put(&pdev->dev); + return ret; +} + static struct amba_cs_uci_id uci_id_etm4[] = { { /* ETMv4 UCI data */ @@ -1749,6 +1764,20 @@ static struct amba_driver etm4x_amba_driver = { .id_table = etm4_ids, };
+static const struct of_device_id etm4_4_match[] = { + { .compatible = "arm,coresight-etm-v4.4" }, + {} +}; + +static struct platform_driver etm4_platform_driver = { + .probe = etm4_probe_platform_dev, + .driver = { + .name = "coresight-etm4x", + .of_match_table = etm4_4_match, + .suppress_bind_attrs = true, + }, +}; + static int __init etm4x_init(void) { int ret; @@ -1761,10 +1790,19 @@ static int __init etm4x_init(void)
ret = amba_driver_register(&etm4x_amba_driver); if (ret) { - pr_err("Error registering etm4x driver\n"); - etm4_pm_clear(); + pr_err("Error registering etm4x AMBA driver\n"); + goto clear_pm; }
+ ret = platform_driver_register(&etm4_platform_driver); + if (!ret) + return 0; + + pr_err("Error registering etm4x platform driver\n"); + amba_driver_unregister(&etm4x_amba_driver); + +clear_pm: + etm4_pm_clear(); return ret; } device_initcall(etm4x_init);