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Date:   Sun, 23 Jun 2019 11:12:52 +0100
From:   Russell King - ARM Linux admin <linux@...linux.org.uk>
To:     Parshuram Thombare <pthombar@...ence.com>
Cc:     andrew@...n.ch, nicolas.ferre@...rochip.com, davem@...emloft.net,
        f.fainelli@...il.com, netdev@...r.kernel.org, hkallweit1@...il.com,
        linux-kernel@...r.kernel.org, rafalc@...ence.com,
        aniljoy@...ence.com, piotrs@...ence.com
Subject: Re: [PATCH v4 3/5] net: macb: add support for c45 PHY

On Sun, Jun 23, 2019 at 10:23:17AM +0100, Parshuram Thombare wrote:
> This patch modify MDIO read/write functions to support
> communication with C45 PHY.

Which Clause 45 PHY are you using?

> 
> Signed-off-by: Parshuram Thombare <pthombar@...ence.com>
> ---
>  drivers/net/ethernet/cadence/macb.h      | 15 ++++--
>  drivers/net/ethernet/cadence/macb_main.c | 61 +++++++++++++++++++-----
>  2 files changed, 61 insertions(+), 15 deletions(-)
> 
> diff --git a/drivers/net/ethernet/cadence/macb.h b/drivers/net/ethernet/cadence/macb.h
> index 6d268283c318..330da702b946 100644
> --- a/drivers/net/ethernet/cadence/macb.h
> +++ b/drivers/net/ethernet/cadence/macb.h
> @@ -642,10 +642,17 @@
>  #define GEM_CLK_DIV96				5
>  
>  /* Constants for MAN register */
> -#define MACB_MAN_SOF				1
> -#define MACB_MAN_WRITE				1
> -#define MACB_MAN_READ				2
> -#define MACB_MAN_CODE				2
> +#define MACB_MAN_C22_SOF                        1
> +#define MACB_MAN_C22_WRITE                      1
> +#define MACB_MAN_C22_READ                       2
> +#define MACB_MAN_C22_CODE                       2
> +
> +#define MACB_MAN_C45_SOF                        0
> +#define MACB_MAN_C45_ADDR                       0
> +#define MACB_MAN_C45_WRITE                      1
> +#define MACB_MAN_C45_POST_READ_INCR             2
> +#define MACB_MAN_C45_READ                       3
> +#define MACB_MAN_C45_CODE                       2
>  
>  /* Capability mask bits */
>  #define MACB_CAPS_ISR_CLEAR_ON_WRITE		BIT(0)
> diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c
> index 10d18b2cef31..94145e460e6e 100644
> --- a/drivers/net/ethernet/cadence/macb_main.c
> +++ b/drivers/net/ethernet/cadence/macb_main.c
> @@ -341,11 +341,30 @@ static int macb_mdio_read(struct mii_bus *bus, int mii_id, int regnum)
>  	if (status < 0)
>  		goto mdio_read_exit;
>  
> -	macb_writel(bp, MAN, (MACB_BF(SOF, MACB_MAN_SOF)
> -			      | MACB_BF(RW, MACB_MAN_READ)
> -			      | MACB_BF(PHYA, mii_id)
> -			      | MACB_BF(REGA, regnum)
> -			      | MACB_BF(CODE, MACB_MAN_CODE)));
> +	if (regnum & MII_ADDR_C45) {
> +		macb_writel(bp, MAN, (MACB_BF(SOF, MACB_MAN_C45_SOF)
> +			    | MACB_BF(RW, MACB_MAN_C45_ADDR)
> +			    | MACB_BF(PHYA, mii_id)
> +			    | MACB_BF(REGA, (regnum >> 16) & 0x1F)
> +			    | MACB_BF(DATA, regnum & 0xFFFF)
> +			    | MACB_BF(CODE, MACB_MAN_C45_CODE)));
> +
> +		status = macb_mdio_wait_for_idle(bp);
> +		if (status < 0)
> +			goto mdio_read_exit;
> +
> +		macb_writel(bp, MAN, (MACB_BF(SOF, MACB_MAN_C45_SOF)
> +			    | MACB_BF(RW, MACB_MAN_C45_READ)
> +			    | MACB_BF(PHYA, mii_id)
> +			    | MACB_BF(REGA, (regnum >> 16) & 0x1F)
> +			    | MACB_BF(CODE, MACB_MAN_C45_CODE)));
> +	} else {
> +		macb_writel(bp, MAN, (MACB_BF(SOF, MACB_MAN_C22_SOF)
> +				| MACB_BF(RW, MACB_MAN_C22_READ)
> +				| MACB_BF(PHYA, mii_id)
> +				| MACB_BF(REGA, regnum)
> +				| MACB_BF(CODE, MACB_MAN_C22_CODE)));
> +	}
>  
>  	status = macb_mdio_wait_for_idle(bp);
>  	if (status < 0)
> @@ -374,12 +393,32 @@ static int macb_mdio_write(struct mii_bus *bus, int mii_id, int regnum,
>  	if (status < 0)
>  		goto mdio_write_exit;
>  
> -	macb_writel(bp, MAN, (MACB_BF(SOF, MACB_MAN_SOF)
> -			      | MACB_BF(RW, MACB_MAN_WRITE)
> -			      | MACB_BF(PHYA, mii_id)
> -			      | MACB_BF(REGA, regnum)
> -			      | MACB_BF(CODE, MACB_MAN_CODE)
> -			      | MACB_BF(DATA, value)));
> +	if (regnum & MII_ADDR_C45) {
> +		macb_writel(bp, MAN, (MACB_BF(SOF, MACB_MAN_C45_SOF)
> +			    | MACB_BF(RW, MACB_MAN_C45_ADDR)
> +			    | MACB_BF(PHYA, mii_id)
> +			    | MACB_BF(REGA, (regnum >> 16) & 0x1F)
> +			    | MACB_BF(DATA, regnum & 0xFFFF)
> +			    | MACB_BF(CODE, MACB_MAN_C45_CODE)));
> +
> +		status = macb_mdio_wait_for_idle(bp);
> +		if (status < 0)
> +			goto mdio_write_exit;
> +
> +		macb_writel(bp, MAN, (MACB_BF(SOF, MACB_MAN_C45_SOF)
> +			    | MACB_BF(RW, MACB_MAN_C45_WRITE)
> +			    | MACB_BF(PHYA, mii_id)
> +			    | MACB_BF(REGA, (regnum >> 16) & 0x1F)
> +			    | MACB_BF(CODE, MACB_MAN_C45_CODE)
> +			    | MACB_BF(DATA, value)));
> +	} else {
> +		macb_writel(bp, MAN, (MACB_BF(SOF, MACB_MAN_C22_SOF)
> +				| MACB_BF(RW, MACB_MAN_C22_WRITE)
> +				| MACB_BF(PHYA, mii_id)
> +				| MACB_BF(REGA, regnum)
> +				| MACB_BF(CODE, MACB_MAN_C22_CODE)
> +				| MACB_BF(DATA, value)));
> +	}
>  
>  	status = macb_mdio_wait_for_idle(bp);
>  	if (status < 0)
> -- 
> 2.17.1
> 
> 

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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