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Groups > linux.kernel > #1692737

[PATCH v5 13/19] coresight tmc: Detect support for scatter gather

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The SG unit in the TMC has been removed in Coresight SoC-600.
This is however advertised by DEVID:Bit 24 = 0b1. On the
previous generation, the bit is RES0, hence we can rely on the
DEVID to detect the support.

Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Mike Leach <mike.leach@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
 drivers/hwtracing/coresight/coresight-tmc.c | 2 ++
 drivers/hwtracing/coresight/coresight-tmc.h | 5 +++++
 2 files changed, 7 insertions(+)

diff --git a/drivers/hwtracing/coresight/coresight-tmc.c b/drivers/hwtracing/coresight/coresight-tmc.c
index 4e7cd9a..6d9b8e3 100644
--- a/drivers/hwtracing/coresight/coresight-tmc.c
+++ b/drivers/hwtracing/coresight/coresight-tmc.c
@@ -306,6 +306,8 @@ static int tmc_etr_setup_caps(struct tmc_drvdata *drvdata,
 	/* Set the unadvertised capabilities */
 	tmc_etr_init_caps(drvdata, (u32)(unsigned long)dev_caps);
 
+	if (!(devid & TMC_DEVID_NOSCAT))
+		tmc_etr_set_cap(drvdata, TMC_ETR_SG);
 	/*
 	 * ETR configuration uses a 40-bit AXI master in place of
 	 * the embedded SRAM of ETB/ETF.
diff --git a/drivers/hwtracing/coresight/coresight-tmc.h b/drivers/hwtracing/coresight/coresight-tmc.h
index 7b20863..23dfbf3 100644
--- a/drivers/hwtracing/coresight/coresight-tmc.h
+++ b/drivers/hwtracing/coresight/coresight-tmc.h
@@ -70,6 +70,8 @@
 #define TMC_FFCR_STOP_ON_FLUSH	BIT(12)
 
 
+#define TMC_DEVID_NOSCAT	BIT(24)
+
 enum tmc_config_type {
 	TMC_CONFIG_TYPE_ETB,
 	TMC_CONFIG_TYPE_ETR,
@@ -89,6 +91,9 @@ enum tmc_mem_intf_width {
 	TMC_MEM_INTF_WIDTH_256BITS	= 8,
 };
 
+/* TMC ETR Capability bit definitions */
+#define TMC_ETR_SG			(0x1U << 0)
+
 /**
  * struct tmc_drvdata - specifics associated to an TMC component
  * @base:	memory mapped base address for this component.
-- 
2.7.5

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[PATCH v5 00/19] coresight: Support for ARM Coresight SoC-600 Suzuki K Poulose <suzuki.poulose@arm.com> - 2017-07-20 12:20 +0200
  [PATCH v5 13/19] coresight tmc: Detect support for scatter gather Suzuki K Poulose <suzuki.poulose@arm.com> - 2017-07-20 12:20 +0200
  [PATCH v5 18/19] coresight tmc: Add support for Coresight SoC 600 TMC Suzuki K Poulose <suzuki.poulose@arm.com> - 2017-07-20 12:20 +0200
    Re: [PATCH v5 18/19] coresight tmc: Add support for Coresight SoC 600 TMC Mathieu Poirier <mathieu.poirier@linaro.org> - 2017-07-24 19:20 +0200
      Re: [PATCH v5 18/19] coresight tmc: Add support for Coresight SoC 600  TMC Suzuki K Poulose <Suzuki.Poulose@arm.com> - 2017-07-25 11:40 +0200
  [PATCH v5 08/19] coresight tmc: Add helpers for accessing 64bit registers Suzuki K Poulose <suzuki.poulose@arm.com> - 2017-07-20 12:20 +0200
    Re: [PATCH v5 08/19] coresight tmc: Add helpers for accessing 64bit registers Mathieu Poirier <mathieu.poirier@linaro.org> - 2017-07-24 19:20 +0200
      Re: [PATCH v5 08/19] coresight tmc: Add helpers for accessing 64bit  registers Suzuki K Poulose <Suzuki.Poulose@arm.com> - 2017-07-25 11:30 +0200
  [PATCH v5 07/19] coresight: Use the new helper for defining registers Suzuki K Poulose <suzuki.poulose@arm.com> - 2017-07-20 12:30 +0200
  [PATCH v5 06/19] coresight: Add support for reading 64bit registers Suzuki K Poulose <suzuki.poulose@arm.com> - 2017-07-20 12:30 +0200
  [PATCH v5 05/19] coresight: Extend the PIDR mask to cover relevant bits in PIDR2 Suzuki K Poulose <suzuki.poulose@arm.com> - 2017-07-20 12:30 +0200
  [PATCH v5 10/19] coresight replicator: Expose replicator management registers Suzuki K Poulose <suzuki.poulose@arm.com> - 2017-07-20 12:30 +0200
  [PATCH v5 04/19] arm64: qcom-msm8916: dts: Update coresight replicator Suzuki K Poulose <suzuki.poulose@arm.com> - 2017-07-20 12:30 +0200
  [PATCH v5 03/19] arm: qcom-msm8974: dts: Update coresight replicator Suzuki K Poulose <suzuki.poulose@arm.com> - 2017-07-20 12:30 +0200
    Re: [PATCH v5 03/19] arm: qcom-msm8974: dts: Update coresight  replicator Suzuki K Poulose <Suzuki.Poulose@arm.com> - 2017-07-27 13:20 +0200
      Re: [PATCH v5 03/19] arm: qcom-msm8974: dts: Update coresight  replicator Andy Gross <andy.gross@linaro.org> - 2017-07-27 23:10 +0200
  [PATCH v5 09/19] coresight tmc: Expose DBA and AXICTL Suzuki K Poulose <suzuki.poulose@arm.com> - 2017-07-20 12:30 +0200
  [PATCH v5 02/19] arm64: juno: dts: Use the new coresight replicator string Suzuki K Poulose <suzuki.poulose@arm.com> - 2017-07-20 12:30 +0200
    Re: [PATCH v5 02/19] arm64: juno: dts: Use the new coresight  replicator string Liviu Dudau <liviu.dudau@arm.com> - 2017-07-20 15:00 +0200
      Re: [PATCH v5 02/19] arm64: juno: dts: Use the new coresight  replicator string Sudeep Holla <sudeep.holla@arm.com> - 2017-07-27 13:30 +0200
  [PATCH v5 01/19] coresight replicator: Cleanup programmable replicator naming Suzuki K Poulose <suzuki.poulose@arm.com> - 2017-07-20 12:30 +0200
  Re: [PATCH v5 00/19] coresight: Support for ARM Coresight SoC-600 Mathieu Poirier <mathieu.poirier@linaro.org> - 2017-07-24 19:20 +0200
    Re: [PATCH v5 00/19] coresight: Support for ARM Coresight SoC-600 Suzuki K Poulose <Suzuki.Poulose@arm.com> - 2017-07-25 11:50 +0200

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