linux-kernel - [PATCH V4 03/11] coresight: tmc: Extract device properties from AMBA pid based table lookup

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Date: Tue, 23 Jan 2024 11:16:00 +0530
From: Anshuman Khandual <anshuman.khandual@....com>
To: linux-arm-kernel@...ts.infradead.org,
	suzuki.poulose@....com
Cc: Anshuman Khandual <anshuman.khandual@....com>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Sudeep Holla <sudeep.holla@....com>,
	Mike Leach <mike.leach@...aro.org>,
	James Clark <james.clark@....com>,
	Maxime Coquelin <mcoquelin.stm32@...il.com>,
	Alexandre Torgue <alexandre.torgue@...s.st.com>,
	linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	coresight@...ts.linaro.org,
	linux-stm32@...md-mailman.stormreply.com
Subject: [PATCH V4 03/11] coresight: tmc: Extract device properties from AMBA pid based table lookup

This extracts device properties from AMBA pid based table lookup. This also
defers tmc_etr_setup_caps() after the coresight device has been initialized
so that PID value can be read.

Cc: Suzuki K Poulose <suzuki.poulose@....com>
Cc: Mike Leach <mike.leach@...aro.org>
Cc: James Clark <james.clark@....com>
Cc: coresight@...ts.linaro.org
Cc: linux-arm-kernel@...ts.infradead.org
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
---
 .../hwtracing/coresight/coresight-tmc-core.c  | 19 +++++++++++++------
 1 file changed, 13 insertions(+), 6 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-tmc-core.c b/drivers/hwtracing/coresight/coresight-tmc-core.c
index 7ec5365e2b64..e71db3099a29 100644
--- a/drivers/hwtracing/coresight/coresight-tmc-core.c
+++ b/drivers/hwtracing/coresight/coresight-tmc-core.c
@@ -370,16 +370,24 @@ static inline bool tmc_etr_has_non_secure_access(struct tmc_drvdata *drvdata)
 	return (auth & TMC_AUTH_NSID_MASK) == 0x3;
 }
 
+#define TMC_AMBA_MASK 0xfffff
+
+static const struct amba_id tmc_ids[];
+
 /* Detect and initialise the capabilities of a TMC ETR */
-static int tmc_etr_setup_caps(struct device *parent, u32 devid, void *dev_caps)
+static int tmc_etr_setup_caps(struct device *parent, u32 devid)
 {
 	int rc;
-	u32 dma_mask = 0;
+	u32 tmc_pid, dma_mask = 0;
 	struct tmc_drvdata *drvdata = dev_get_drvdata(parent);
+	void *dev_caps;
 
 	if (!tmc_etr_has_non_secure_access(drvdata))
 		return -EACCES;
 
+	tmc_pid = coresight_get_pid(&drvdata->csdev->access) & TMC_AMBA_MASK;
+	dev_caps = coresight_get_uci_data_from_amba(tmc_ids, tmc_pid);
+
 	/* Set the unadvertised capabilities */
 	tmc_etr_init_caps(drvdata, (u32)(unsigned long)dev_caps);
 
@@ -497,10 +505,6 @@ static int tmc_probe(struct amba_device *adev, const struct amba_id *id)
 		desc.type = CORESIGHT_DEV_TYPE_SINK;
 		desc.subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_SYSMEM;
 		desc.ops = &tmc_etr_cs_ops;
-		ret = tmc_etr_setup_caps(dev, devid,
-					 coresight_get_uci_data(id));
-		if (ret)
-			goto out;
 		idr_init(&drvdata->idr);
 		mutex_init(&drvdata->idr_mutex);
 		dev_list = &etr_devs;
@@ -539,6 +543,9 @@ static int tmc_probe(struct amba_device *adev, const struct amba_id *id)
 		goto out;
 	}
 
+	if (drvdata->config_type == TMC_CONFIG_TYPE_ETR)
+		ret = tmc_etr_setup_caps(dev, devid);
+
 	drvdata->miscdev.name = desc.name;
 	drvdata->miscdev.minor = MISC_DYNAMIC_MINOR;
 	drvdata->miscdev.fops = &tmc_fops;
-- 
2.25.1