linux-kernel - Re: [PATCH net-next 2/3] net: stmmac: xgmac: Add C45 PHY support in the MDIO callbacks

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Message-ID: <20191030162829.GC10555@lunn.ch>
Date:   Wed, 30 Oct 2019 17:28:29 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Jose Abreu <Jose.Abreu@...opsys.com>
Cc:     netdev@...r.kernel.org, Joao Pinto <Joao.Pinto@...opsys.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        linux-kernel@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        "David S. Miller" <davem@...emloft.net>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH net-next 2/3] net: stmmac: xgmac: Add C45 PHY support in
 the MDIO callbacks

On Wed, Oct 30, 2019 at 04:28:49PM +0100, Jose Abreu wrote:
> Add the support for C45 PHYs in the MDIO callbacks for XGMAC. This was
> tested using Synopsys DesignWare XPCS.
> 
> Signed-off-by: Jose Abreu <Jose.Abreu@...opsys.com>
> 
> ---
> Cc: Giuseppe Cavallaro <peppe.cavallaro@...com>
> Cc: Alexandre Torgue <alexandre.torgue@...com>
> Cc: Jose Abreu <joabreu@...opsys.com>
> Cc: "David S. Miller" <davem@...emloft.net>
> Cc: Maxime Coquelin <mcoquelin.stm32@...il.com>
> Cc: netdev@...r.kernel.org
> Cc: linux-stm32@...md-mailman.stormreply.com
> Cc: linux-arm-kernel@...ts.infradead.org
> Cc: linux-kernel@...r.kernel.org
> ---
>  drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c | 47 +++++++++++++++++++++--
>  1 file changed, 43 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
> index 40c42637ad75..143bffd28acf 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
> @@ -41,6 +41,29 @@
>  #define MII_XGMAC_BUSY			BIT(22)
>  #define MII_XGMAC_MAX_C22ADDR		3
>  #define MII_XGMAC_C22P_MASK		GENMASK(MII_XGMAC_MAX_C22ADDR, 0)
> +#define MII_XGMAC_PA_SHIFT		16
> +#define MII_XGMAC_DA_SHIFT		21
> +
> +static int stmmac_xgmac2_c45_format(struct stmmac_priv *priv, int phyaddr,
> +				    int phyreg, u32 *hw_addr)
> +{
> +	unsigned int mii_data = priv->hw->mii.data;
> +	u32 tmp;
> +
> +	/* Wait until any existing MII operation is complete */
> +	if (readl_poll_timeout(priv->ioaddr + mii_data, tmp,
> +			       !(tmp & MII_XGMAC_BUSY), 100, 10000))
> +		return -EBUSY;

Hi Jose

The stmmac_xgmac2_c22_format function does the same. Maybe the call
can be pulled out into stmmac_xgmac2_mdio_write() and
stmmac_xgmac2_mdio_read()?

	Andrew