[PATCH 09/12] coresight tmc: Add capability information

From: Suzuki K Poulose <suzuki.poulose@arm.com>
To: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org, mathieu.poirier@linaro.org,
	Suzuki K Poulose <suzuki.poulose@arm.com>
Subject: [PATCH 09/12] coresight tmc: Add capability information
Date: Mon, 12 Jun 2017 15:36:48 +0100	[thread overview]
Message-ID: <1497278211-5001-10-git-send-email-suzuki.poulose@arm.com> (raw)
In-Reply-To: <1497278211-5001-1-git-send-email-suzuki.poulose@arm.com>

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
