Re: [PATCH v1 3/5] fpga: dfl: Add DFHv1 Register Definitions

From: Xu Yilun <yilun.xu@intel.com>
To: matthew.gerlach@linux.intel.com
Cc: hao.wu@intel.com, russell.h.weight@intel.com,
	basheer.ahmed.muddebihal@intel.com, trix@redhat.com,
	mdf@kernel.org, linux-fpga@vger.kernel.org,
	linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
	tianfei.zhang@intel.com, corbet@lwn.net,
	gregkh@linuxfoundation.org, linux-serial@vger.kernel.org,
	jirislaby@kernel.org, geert+renesas@glider.be,
	andriy.shevchenko@linux.intel.com,
	niklas.soderlund+renesas@ragnatech.se, phil.edworthy@renesas.com,
	macro@orcam.me.uk, johan@kernel.org, lukas@wunner.de,
	Basheer Ahmed Muddebihal 
	<basheer.ahmed.muddebihal@linux.intel.com>
Subject: Re: [PATCH v1 3/5] fpga: dfl: Add DFHv1 Register Definitions
Date: Sun, 11 Sep 2022 16:27:45 +0800	[thread overview]
Message-ID: <Yx2cAaQ0HhPkYyC4@yilunxu-OptiPlex-7050> (raw)
In-Reply-To: <20220906190426.3139760-4-matthew.gerlach@linux.intel.com>

On 2022-09-06 at 12:04:24 -0700, matthew.gerlach@linux.intel.com wrote:
> From: Basheer Ahmed Muddebihal <basheer.ahmed.muddebihal@linux.intel.com>
> 
> This patch adds the definitions for DFHv1 header and related register
> bitfields.
> 
> Signed-off-by: Basheer Ahmed Muddebihal <basheer.ahmed.muddebihal@linux.intel.com>
> Signed-off-by: Matthew Gerlach <matthew.gerlach@linux.intel.com>
> ---
>  include/linux/dfl.h | 37 +++++++++++++++++++++++++++++++++++++
>  1 file changed, 37 insertions(+)
> 
> diff --git a/include/linux/dfl.h b/include/linux/dfl.h
> index b5accdcfa368..61bcf20c1bc8 100644
> --- a/include/linux/dfl.h
> +++ b/include/linux/dfl.h
> @@ -23,6 +23,16 @@
>  #define GUID_H			0x10
>  #define NEXT_AFU		0x18
>  
> +/*
> + * DFHv1 Register Offset definitons
> + * In DHFv1, DFH + GUID + CSR_START + CSR_SIZE_GROUP + PARAM_HDR + PARAM_DATA
> + * as common header registers
> + */
> +#define DFHv1_CSR_ADDR		0x18  /* CSR Register start address */
> +#define DFHv1_CSR_SIZE_GRP	0x20  /* Size of Reg Block and Group/tag */
> +#define DFHv1_PARAM_HDR		0x28  /* Optional First Param header */
> +#define DFHv1_PARAM_DATA	0x8   /* Offset of Param data from Param header */
> +
>  #define DFH_SIZE		0x8
>  
>  /* Device Feature Header Register Bitfield */
> @@ -30,8 +40,35 @@
>  #define DFH_REVISION		GENMASK_ULL(15, 12)	/* Feature revision */
>  #define DFH_NEXT_HDR_OFST	GENMASK_ULL(39, 16)	/* Offset to next DFH */
>  #define DFH_EOL			BIT_ULL(40)		/* End of list */
> +#define DFH_VERSION		GENMASK_ULL(59, 52)	/* DFH version */
>  #define DFH_TYPE		GENMASK_ULL(63, 60)	/* Feature type */
>  
> +/*
> + *  CSR Rel Bit, 1'b0 = relative (offset from feature DFH start),

Reduce one whitespace indent.

> + * 1'b1 = absolute (ARM or other non-PCIe use)
> + */
> +#define DFHv1_CSR_ADDR_REL	BIT_ULL(0)
> +
> +/*
> + * CSR Header Register Bit Definitions
> + */

Use oneline style comment should be OK?

> +#define DFHv1_CSR_ADDR_MASK       GENMASK_ULL(63, 1)  /* 63:1 of CSR address */
> +
> +/*
> + * CSR SIZE Goup Register Bit Definitions
> + */

Same concern

> +#define DFHv1_CSR_SIZE_GRP_INSTANCE_ID	GENMASK_ULL(15, 0)	/* Enumeration instantiated IP */
> +#define DFHv1_CSR_SIZE_GRP_GROUPING_ID	GENMASK_ULL(30, 16)	/* Group Features/interfaces */
> +#define DFHv1_CSR_SIZE_GRP_HAS_PARAMS	BIT_ULL(31)		/* Presence of Parameters */
> +#define DFHv1_CSR_SIZE_GRP_SIZE		GENMASK_ULL(63, 32)	/* Size of CSR Block in bytes */
> +
> +/*
> + * PARAM Header Register Bit Definitions
> + */

Same

> +#define DFHv1_PARAM_HDR_ID		GENMASK_ULL(15, 0) /* Id of this Param  */
> +#define DFHv1_PARAM_HDR_VERSION		GENMASK_ULL(31, 16) /* Version Param */
> +#define DFHv1_PARAM_HDR_NEXT_OFFSET	GENMASK_ULL(63, 32) /* Offset of next Param */
> +
>  /**
>   * enum dfl_id_type - define the DFL FIU types
>   */
> -- 
> 2.25.1
> 