linux-kernel - [PATCH v7 13/28] coresight: etm4x: Define DEVARCH register fields

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Message-Id: <20210110224850.1880240-14-suzuki.poulose@arm.com>
Date:   Sun, 10 Jan 2021 22:48:35 +0000
From:   Suzuki K Poulose <suzuki.poulose@....com>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     coresight@...ts.linaro.org, mathieu.poirier@...aro.org,
        anshuman.khandual@....com, mike.leach@...aro.org,
        leo.yan@...aro.org, linux-kernel@...r.kernel.org,
        jonathan.zhouwen@...wei.com, catalin.marinas@....com,
        Suzuki K Poulose <suzuki.poulose@....com>
Subject: [PATCH v7 13/28] coresight: etm4x: Define DEVARCH register fields

Define the fields of the DEVARCH register for identifying
a component as an ETMv4.x unit. Going forward, we use the
DEVARCH register for the component identification, rather
than the TRCIDR3.

Cc: Mike Leach <mike.leach@...aro.org>
Reviewed-by: Mathieu Poirier <mathieu.poirier@...aro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
---
 .../coresight/coresight-etm4x-core.c          |  4 +-
 drivers/hwtracing/coresight/coresight-etm4x.h | 42 +++++++++++++++++++
 2 files changed, 44 insertions(+), 2 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-etm4x-core.c b/drivers/hwtracing/coresight/coresight-etm4x-core.c
index d8122b6284d9..043cd52a6fae 100644
--- a/drivers/hwtracing/coresight/coresight-etm4x-core.c
+++ b/drivers/hwtracing/coresight/coresight-etm4x-core.c
@@ -1720,8 +1720,8 @@ static int etm4_probe(struct amba_device *adev, const struct amba_id *id)
 static struct amba_cs_uci_id uci_id_etm4[] = {
 	{
 		/*  ETMv4 UCI data */
-		.devarch	= 0x47704a13,
-		.devarch_mask	= 0xfff0ffff,
+		.devarch	= ETM_DEVARCH_ETMv4x_ARCH,
+		.devarch_mask	= ETM_DEVARCH_ID_MASK,
 		.devtype	= 0x00000013,
 	}
 };
diff --git a/drivers/hwtracing/coresight/coresight-etm4x.h b/drivers/hwtracing/coresight/coresight-etm4x.h
index 193d2819afa7..fba3c02eea0b 100644
--- a/drivers/hwtracing/coresight/coresight-etm4x.h
+++ b/drivers/hwtracing/coresight/coresight-etm4x.h
@@ -506,6 +506,48 @@
 					 ETM_MODE_EXCL_KERN | \
 					 ETM_MODE_EXCL_USER)
 
+/*
+ * TRCDEVARCH Bit field definitions
+ * Bits[31:21]	- ARCHITECT = Always Arm Ltd.
+ *                * Bits[31:28] = 0x4
+ *                * Bits[27:21] = 0b0111011
+ * Bit[20]	- PRESENT,  Indicates the presence of this register.
+ *
+ * Bit[19:16]	- REVISION, Revision of the architecture.
+ *
+ * Bit[15:0]	- ARCHID, Identifies this component as an ETM
+ *                * Bits[15:12] - architecture version of ETM
+ *                *             = 4 for ETMv4
+ *                * Bits[11:0] = 0xA13, architecture part number for ETM.
+ */
+#define ETM_DEVARCH_ARCHITECT_MASK		GENMASK(31, 21)
+#define ETM_DEVARCH_ARCHITECT_ARM		((0x4 << 28) | (0b0111011 << 21))
+#define ETM_DEVARCH_PRESENT			BIT(20)
+#define ETM_DEVARCH_REVISION_SHIFT		16
+#define ETM_DEVARCH_REVISION_MASK		GENMASK(19, 16)
+#define ETM_DEVARCH_REVISION(x)			\
+	(((x) & ETM_DEVARCH_REVISION_MASK) >> ETM_DEVARCH_REVISION_SHIFT)
+#define ETM_DEVARCH_ARCHID_MASK			GENMASK(15, 0)
+#define ETM_DEVARCH_ARCHID_ARCH_VER_SHIFT	12
+#define ETM_DEVARCH_ARCHID_ARCH_VER_MASK	GENMASK(15, 12)
+#define ETM_DEVARCH_ARCHID_ARCH_VER(x)		\
+	(((x) & ETM_DEVARCH_ARCHID_ARCH_VER_MASK) >> ETM_DEVARCH_ARCHID_ARCH_VER_SHIFT)
+
+#define ETM_DEVARCH_MAKE_ARCHID_ARCH_VER(ver)			\
+	(((ver) << ETM_DEVARCH_ARCHID_ARCH_VER_SHIFT) & ETM_DEVARCH_ARCHID_ARCH_VER_MASK)
+
+#define ETM_DEVARCH_ARCHID_ARCH_PART(x)		((x) & 0xfffUL)
+
+#define ETM_DEVARCH_MAKE_ARCHID(major)			\
+	((ETM_DEVARCH_MAKE_ARCHID_ARCH_VER(major)) | ETM_DEVARCH_ARCHID_ARCH_PART(0xA13))
+
+#define ETM_DEVARCH_ARCHID_ETMv4x		ETM_DEVARCH_MAKE_ARCHID(0x4)
+
+#define ETM_DEVARCH_ID_MASK						\
+	(ETM_DEVARCH_ARCHITECT_MASK | ETM_DEVARCH_ARCHID_MASK | ETM_DEVARCH_PRESENT)
+#define ETM_DEVARCH_ETMv4x_ARCH						\
+	(ETM_DEVARCH_ARCHITECT_ARM | ETM_DEVARCH_ARCHID_ETMv4x | ETM_DEVARCH_PRESENT)
+
 #define TRCSTATR_IDLE_BIT		0
 #define TRCSTATR_PMSTABLE_BIT		1
 #define ETM_DEFAULT_ADDR_COMP		0
-- 
2.24.1