From 2e21934568c0f9fcd2e01060007506a74d49152b Mon Sep 17 00:00:00 2001 From: Suzuki K Poulose Date: Wed, 2 Aug 2017 10:22:12 -0600 Subject: [PATCH] coresight tmc: Detect support for scatter gather 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 Cc: Mike Leach Signed-off-by: Suzuki K Poulose Signed-off-by: Mathieu Poirier Signed-off-by: Greg Kroah-Hartman --- 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 0c99ef7..bb409c4 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 13ab100..bb6a3e3 100644 --- a/drivers/hwtracing/coresight/coresight-tmc.h +++ b/drivers/hwtracing/coresight/coresight-tmc.h @@ -69,6 +69,8 @@ #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, @@ -88,6 +90,9 @@ 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. -- 2.7.4