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Subject[PATCH 09/12] coresight tmc: Add capability information
Date
This patch adds description of the capabilities of a given TMC.
This will help us to handle different versions of the TMC in the
same driver by checking the capabilities.

Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
drivers/hwtracing/coresight/coresight-tmc.c | 10 +++++++++-
drivers/hwtracing/coresight/coresight-tmc.h | 18 ++++++++++++++++++
2 files changed, 27 insertions(+), 1 deletion(-)

diff --git a/drivers/hwtracing/coresight/coresight-tmc.c b/drivers/hwtracing/coresight/coresight-tmc.c
index 7152656..e88f2f3 100644
--- a/drivers/hwtracing/coresight/coresight-tmc.c
+++ b/drivers/hwtracing/coresight/coresight-tmc.c
@@ -399,16 +399,24 @@ static int tmc_probe(struct amba_device *adev, const struct amba_id *id)
ret = misc_register(&drvdata->miscdev);
if (ret)
coresight_unregister(drvdata->csdev);
+ else if (id->data)
+ drvdata->caps = *(struct tmc_caps *)id->data;
out:
return ret;
}

+static struct tmc_caps coresight_soc_400_tmc_caps = {
+ .caps = CORESIGHT_SOC_400_TMC_CAPS,
+};
+
static struct amba_id tmc_ids[] = {
{
+ /* Coresight SoC 400 TMC */
.id = 0x000bb961,
.mask = 0x000fffff,
+ .data = &coresight_soc_400_tmc_caps,
},
- { 0, 0},
+ {},
};

static struct amba_driver tmc_driver = {
diff --git a/drivers/hwtracing/coresight/coresight-tmc.h b/drivers/hwtracing/coresight/coresight-tmc.h
index c78de00..87e4561 100644
--- a/drivers/hwtracing/coresight/coresight-tmc.h
+++ b/drivers/hwtracing/coresight/coresight-tmc.h
@@ -89,6 +89,18 @@ enum tmc_mem_intf_width {
TMC_MEM_INTF_WIDTH_256BITS = 8,
};

+#define TMC_CAP_ETR_SG_UNIT (1U << 0)
+
+/**
+ * struct tmc_cap - Describes the capabilities of the TMC.
+ * @caps: - Bitmask of the capacities
+ */
+struct tmc_caps {
+ u32 caps;
+};
+
+#define CORESIGHT_SOC_400_TMC_CAPS (TMC_CAP_ETR_SG_UNIT)
+
/**
* struct tmc_drvdata - specifics associated to an TMC component
* @base: memory mapped base address for this component.
@@ -110,6 +122,7 @@ struct tmc_drvdata {
void __iomem *base;
struct device *dev;
struct coresight_device *csdev;
+ struct tmc_caps caps;
struct miscdevice miscdev;
spinlock_t spinlock;
bool reading;
@@ -158,4 +171,9 @@ TMC_REG_PAIR(rrp, TMC_RRP, TMC_RRPHI)
TMC_REG_PAIR(rwp, TMC_RWP, TMC_RWPHI)
TMC_REG_PAIR(dba, TMC_DBALO, TMC_DBAHI)

+static inline bool tmc_has_cap(struct tmc_drvdata *drvdata, u32 cap)
+{
+ return !!(drvdata->caps.caps & cap);
+}
+
#endif
--
2.7.4
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