linux-kernel - Re: [PATCH v7 2/4] fpga: dfl: Add DFHv1 Register Definitions

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Message-ID: <Y6HozWmkwElC8pUc@smile.fi.intel.com>
Date:   Tue, 20 Dec 2022 18:54:37 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     matthew.gerlach@...ux.intel.com
Cc:     hao.wu@...el.com, yilun.xu@...el.com, russell.h.weight@...el.com,
        basheer.ahmed.muddebihal@...el.com, trix@...hat.com,
        mdf@...nel.org, linux-fpga@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        tianfei.zhang@...el.com, corbet@....net,
        gregkh@...uxfoundation.org, linux-serial@...r.kernel.org,
        jirislaby@...nel.org, geert+renesas@...der.be,
        niklas.soderlund+renesas@...natech.se, macro@...am.me.uk,
        johan@...nel.org, lukas@...ner.de, ilpo.jarvinen@...ux.intel.com,
        marpagan@...hat.com, bagasdotme@...il.com,
        Basheer Ahmed Muddebihal 
        <basheer.ahmed.muddebihal@...ux.intel.com>
Subject: Re: [PATCH v7 2/4] fpga: dfl: Add DFHv1 Register Definitions

On Tue, Dec 20, 2022 at 08:36:50AM -0800, matthew.gerlach@...ux.intel.com wrote:
> From: Basheer Ahmed Muddebihal <basheer.ahmed.muddebihal@...ux.intel.com>
> 
> This patch adds the definitions for DFHv1 header and related register
> bitfields.

Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

> Signed-off-by: Basheer Ahmed Muddebihal <basheer.ahmed.muddebihal@...ux.intel.com>
> Co-developed-by: Matthew Gerlach <matthew.gerlach@...ux.intel.com>
> Signed-off-by: Matthew Gerlach <matthew.gerlach@...ux.intel.com>
> Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
> ---
> v7: no change
> 
> v6: remove parameter definitions from include/linux/dfl.h
> 
> v5: consistently use fields for parameter data
>     s/EOL/EOP/ to match doc
>     remove unneeded mask
>     added Co-developed-by
> 
> v4: s/MSIX/MSI_X/g
>     move kerneldoc to implementation
>     don't change copyright date
> 
> v3:
>     keep DFHv1 definitions "hidden" in drivers/fpga/dfl.h
> 
> v2: clean up white space and one line comments
>     remove extra space in commit
>     use uniform number of digits in constants
>     don't change copyright date because of removed content
> ---
>  drivers/fpga/dfl.h | 32 ++++++++++++++++++++++++++++++++
>  1 file changed, 32 insertions(+)
> 
> diff --git a/drivers/fpga/dfl.h b/drivers/fpga/dfl.h
> index 06cfcd5e84bb..fc59f33367ee 100644
> --- a/drivers/fpga/dfl.h
> +++ b/drivers/fpga/dfl.h
> @@ -74,11 +74,43 @@
>  #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 */
>  #define DFH_TYPE_AFU		1
>  #define DFH_TYPE_PRIVATE	3
>  #define DFH_TYPE_FIU		4
>  
> +/*
> + * 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 */
> +
> +/*
> + * CSR Rel Bit, 1'b0 = relative (offset from feature DFH start),
> + * 1'b1 = absolute (ARM or other non-PCIe use)
> + */
> +#define DFHv1_CSR_ADDR_REL	BIT_ULL(0)
> +
> +/* CSR Header Register Bit Definitions */
> +#define DFHv1_CSR_ADDR_MASK       GENMASK_ULL(63, 1)  /* 63:1 of CSR address */
> +
> +/* CSR SIZE Goup Register Bit Definitions */
> +#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 */
> +#define DFHv1_PARAM_HDR_ID		GENMASK_ULL(15, 0) /* Id of this Param  */
> +#define DFHv1_PARAM_HDR_VER		GENMASK_ULL(31, 16) /* Version Param */
> +#define DFHv1_PARAM_HDR_NEXT_OFFSET	GENMASK_ULL(63, 35) /* Offset of next Param */
> +#define DFHv1_PARAM_HDR_NEXT_EOP	BIT_ULL(32)
> +#define DFHv1_PARAM_DATA		0x08  /* Offset of Param data from Param header */
> +
>  /* Next AFU Register Bitfield */
>  #define NEXT_AFU_NEXT_DFH_OFST	GENMASK_ULL(23, 0)	/* Offset to next AFU */
>  
> -- 
> 2.25.1
> 

-- 
With Best Regards,
Andy Shevchenko