linux-kernel - [PATCH v3 14/18] coresight tmc etr: Cleanup AXICTL register handling

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Message-Id: <1500037463-19951-15-git-send-email-suzuki.poulose@arm.com>
Date:   Fri, 14 Jul 2017 14:04:19 +0100
From:   Suzuki K Poulose <suzuki.poulose@....com>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org, mathieu.poirier@...aro.org,
        mike.leach@...aro.org, Suzuki K Poulose <suzuki.poulose@....com>
Subject: [PATCH v3 14/18] coresight tmc etr: Cleanup AXICTL register handling

This patch cleans up how we setup the AXICTL register on
TMC ETR. At the moment we don't set the CacheCtrl bits, which
drives the arcache and awcache bits on AXI bus specifying the
cacheablitiy. Set this to Write-back Read and Write-allocate.

Cc: Mathieu Poirier <mathieu.poirier@...aro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
---
 drivers/hwtracing/coresight/coresight-tmc-etr.c | 10 +++-------
 drivers/hwtracing/coresight/coresight-tmc.h     | 17 ++++++++++++++++-
 2 files changed, 19 insertions(+), 8 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-tmc-etr.c b/drivers/hwtracing/coresight/coresight-tmc-etr.c
index ff11b92..4aa5d36 100644
--- a/drivers/hwtracing/coresight/coresight-tmc-etr.c
+++ b/drivers/hwtracing/coresight/coresight-tmc-etr.c
@@ -36,13 +36,9 @@ static void tmc_etr_enable_hw(struct tmc_drvdata *drvdata)
 	writel_relaxed(TMC_MODE_CIRCULAR_BUFFER, drvdata->base + TMC_MODE);
 
 	axictl = readl_relaxed(drvdata->base + TMC_AXICTL);
-	axictl |= TMC_AXICTL_WR_BURST_16;
-	writel_relaxed(axictl, drvdata->base + TMC_AXICTL);
-	axictl &= ~TMC_AXICTL_SCT_GAT_MODE;
-	writel_relaxed(axictl, drvdata->base + TMC_AXICTL);
-	axictl = (axictl &
-		  ~(TMC_AXICTL_PROT_CTL_B0 | TMC_AXICTL_PROT_CTL_B1)) |
-		  TMC_AXICTL_PROT_CTL_B1;
+	axictl &= ~TMC_AXICTL_CLEAR_MASK;
+	axictl |= (TMC_AXICTL_PROT_CTL_B1 | TMC_AXICTL_WR_BURST_16);
+	axictl |= TMC_AXICTL_AxCACHE_OS;
 	writel_relaxed(axictl, drvdata->base + TMC_AXICTL);
 	tmc_write_dba(drvdata, drvdata->paddr);
 
diff --git a/drivers/hwtracing/coresight/coresight-tmc.h b/drivers/hwtracing/coresight/coresight-tmc.h
index a0668f6..5d6d7e5 100644
--- a/drivers/hwtracing/coresight/coresight-tmc.h
+++ b/drivers/hwtracing/coresight/coresight-tmc.h
@@ -55,11 +55,26 @@
 #define TMC_STS_TMCREADY_BIT	2
 #define TMC_STS_FULL		BIT(0)
 #define TMC_STS_TRIGGERED	BIT(1)
-/* TMC_AXICTL - 0x110 */
+/*
+ * TMC_AXICTL - 0x110
+ *
+ * TMC AXICTL format for SoC-400
+ * 	Bits [0-1]	: ProtCtrlBit0-1
+ * 	Bits [2-5]	: CacheCtrlBits 0-3 (AxCACHE)
+ * 	Bit  6		: Reserved
+ * 	Bit  7		: ScatterGatherMode
+ * 	Bits [8-11]	: WrBurstLen
+ * 	Bits [12-31]	: Reserved.
+ */
+#define TMC_AXICTL_CLEAR_MASK 0xfbf
+
 #define TMC_AXICTL_PROT_CTL_B0	BIT(0)
 #define TMC_AXICTL_PROT_CTL_B1	BIT(1)
 #define TMC_AXICTL_SCT_GAT_MODE	BIT(7)
 #define TMC_AXICTL_WR_BURST_16	0xF00
+/* Write-back Read and Write-allocate */
+#define TMC_AXICTL_AxCACHE_OS	(0xf << 2)
+
 /* TMC_FFCR - 0x304 */
 #define TMC_FFCR_FLUSHMAN_BIT	6
 #define TMC_FFCR_EN_FMT		BIT(0)
-- 
2.7.5