linux-kernel - Re: [PATCH 11/12] coresight tmc: Add support for Coresight SoC 600 TMC

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Message-ID: <20170614182520.GF22030@xps15>
Date:   Wed, 14 Jun 2017 12:25:20 -0600
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     Suzuki K Poulose <suzuki.poulose@....com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 11/12] coresight tmc: Add support for Coresight SoC 600
 TMC

On Mon, Jun 12, 2017 at 03:36:50PM +0100, Suzuki K Poulose wrote:
> The coresight SoC 600 supports ETR save-restore and also supports
> a new mode, SWFIFO2, which helps to streaming the trace data through
> a functional I/O (e.g, USB).
> 
> Also, TMCs have different PIDs in different configurations (ETF,
> ETB & ETR), unlike the previous generation.
> 
> Cc: Mathieu Poirier <mathieu.poirier@...aro.org>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
> ---
>  drivers/hwtracing/coresight/coresight-tmc.c | 20 ++++++++++++++++++++
>  drivers/hwtracing/coresight/coresight-tmc.h |  8 ++++++++
>  2 files changed, 28 insertions(+)
> 
> diff --git a/drivers/hwtracing/coresight/coresight-tmc.c b/drivers/hwtracing/coresight/coresight-tmc.c
> index e88f2f3..03cafa7 100644
> --- a/drivers/hwtracing/coresight/coresight-tmc.c
> +++ b/drivers/hwtracing/coresight/coresight-tmc.c
> @@ -409,6 +409,10 @@ static struct tmc_caps coresight_soc_400_tmc_caps = {
>  	.caps = CORESIGHT_SOC_400_TMC_CAPS,
>  };
>  
> +static struct tmc_caps coresight_soc_600_etr_caps = {
> +	.caps = CORESIGHT_SOC_600_ETR_CAPS,
> +};
> +
>  static struct amba_id tmc_ids[] = {
>  	{
>  		/* Coresight SoC 400 TMC */
> @@ -416,6 +420,22 @@ static struct amba_id tmc_ids[] = {
>  		.mask   = 0x000fffff,
>  		.data	= &coresight_soc_400_tmc_caps,
>  	},
> +	{
> +		/* Coresight SoC 600 TMC-ETR/ETS */
> +		.id	= 0x000bb9e8,
> +		.mask	= 0x000fffff,
> +		.data	= &coresight_soc_600_etr_caps,
> +	},
> +	{
> +		/* Coresight SoC 600 TMC-ETB */
> +		.id	= 0x000bb9e9,
> +		.mask	= 0x000fffff,
> +	},
> +	{
> +		/* Coresight SoC 600 TMC-ETF */
> +		.id	= 0x000bb9ea,
> +		.mask	= 0x000fffff,
> +	},
>  	{},
>  };
>  
> diff --git a/drivers/hwtracing/coresight/coresight-tmc.h b/drivers/hwtracing/coresight/coresight-tmc.h
> index d5ef51e..8c74e1e 100644
> --- a/drivers/hwtracing/coresight/coresight-tmc.h
> +++ b/drivers/hwtracing/coresight/coresight-tmc.h
> @@ -98,6 +98,12 @@ enum tmc_mem_intf_width {
>   * value.
>   */
>  #define TMC_CAP_ETR_SAVE_RESTORE	(1U << 1)
> +/*
> + * TMC_CAP_ETR_SWFIFO2_MODE - ETR supports a new mode, SWFIFO2, which
> + * allows streaming the trace data with optionally raising an interrupt
> + * when the buffer fill level reaches a programmed watermark.
> + */
> +#define TMC_CAP_ETR_SWFIFO2_MODE	(1U << 2)
>  
>  /**
>   * struct tmc_cap - Describes the capabilities of the TMC.
> @@ -108,6 +114,8 @@ struct tmc_caps {
>  };
>  
>  #define CORESIGHT_SOC_400_TMC_CAPS	(TMC_CAP_ETR_SG_UNIT)
> +#define CORESIGHT_SOC_600_ETR_CAPS	(TMC_CAP_ETR_SAVE_RESTORE | \
> +					 TMC_CAP_ETR_SWFIFO2_MODE)

TMC_CAP_ETR_SWFIFO2_MODE isn't used anywhere - please remove.  It can be added
when code that uses the feature is introduced.

Thanks,
Mathieu

>  
>  /**
>   * struct tmc_drvdata - specifics associated to an TMC component
> -- 
> 2.7.4
>