[PATCH V3 02/10] coresight: tmc: Extract device properties from AMBA pid based table lookup

From: Anshuman Khandual
Date: Fri Dec 08 2023 - 00:40:16 EST


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@xxxxxxx>
Cc: Mike Leach <mike.leach@xxxxxxxxxx>
Cc: James Clark <james.clark@xxxxxxx>
Cc: coresight@xxxxxxxxxxxxxxxx
Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Signed-off-by: Anshuman Khandual <anshuman.khandual@xxxxxxx>
---
Changes in V3:

- New patch in the series

.../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 c106d142e632..ad61d02f5f75 100644
--- a/drivers/hwtracing/coresight/coresight-tmc-core.c
+++ b/drivers/hwtracing/coresight/coresight-tmc-core.c
@@ -362,16 +362,24 @@ 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);

@@ -487,10 +495,6 @@ 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;
@@ -528,6 +532,9 @@ 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