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SubjectRe: [PATCH v2 4/4] drivers: net: Add APM X-Gene SoC ethernet driver support.
On 12/04/14 04:06, Iyappan Subramanian wrote:
> This patch adds network driver for APM X-Gene SoC ethernet.
>
> Signed-off-by: Iyappan Subramanian <isubramanian@apm.com>
> Signed-off-by: Ravi Patel <rapatel@apm.com>

[snip]

> +{
> + struct xgene_enet_pdata *pdata = netdev_priv(ndev);
> + struct phy_device *phydev;
> + unsigned char phy_id[MII_BUS_ID_SIZE+3];
> + int ret = 0;
> +
> + phydev = phy_find_first(pdata->mdio_bus);
> + if (!phydev) {
> + netdev_info(ndev, "no PHY found\n");
> + ret = -1;
> + goto out;
> + }
> +
> + /* attach the mac to the phy */
> + snprintf(phy_id, sizeof(phy_id), PHY_ID_FMT, pdata->mdio_bus->id,
> + pdata->phy_addr);
> + phydev = phy_connect(ndev, phy_id,
> + &xgene_enet_mdio_link_change, pdata->phy_mode);
> + if (IS_ERR(phydev)) {
> + netdev_err(ndev, "Could not attach to PHY\n");
> + ret = PTR_ERR(phydev);
> + phydev = NULL;
> + goto out;
> + }
> +

You should be using of_phy_connect or similar so that the
necessary PHY<>OF data is properly initialised

> + netdev_info(ndev, "phy_id=0x%08x phy_drv=\"%s\"",
> + phydev->phy_id, phydev->drv->name);
> +out:
> + pdata->phy_link = 0;
> + pdata->phy_speed = 0;
> + pdata->phy_dev = phydev;
> +
> + return ret;
> +}
> +


[snip]

> +struct xgene_enet_desc {
> + u64 m0;
> + u64 m1;
> + u64 m2;
> + u64 m3;
> +};
> +
> +struct xgene_enet_desc16 {
> + u64 m0;
> + u64 m1;
> +};
> +
> +static inline void xgene_enet_cpu_to_le64(struct xgene_enet_desc *desc,
> + int count)
> +{
> +#ifdef CONFIG_CPU_BIG_ENDIAN
> + int i;
> +
> + for (i = 0; i < count; i++)
> + ((u64 *)desc)[i] = cpu_to_le64(((u64 *)desc)[i]);
> +#endif
> +}
> +
> +static inline void xgene_enet_le64_to_cpu(struct xgene_enet_desc *desc,
> + int count)
> +{
> +#ifdef CONFIG_CPU_BIG_ENDIAN
> + int i;
> +
> + for (i = 0; i < count; i++)
> + ((u64 *)desc)[i] = le64_to_cpu(((u64 *)desc)[i]);
> +#endif
> +}
> +
> +static inline void xgene_enet_desc16_to_le64(struct xgene_enet_desc *desc)
> +{
> +#ifdef CONFIG_CPU_BIG_ENDIAN
> + ((u64 *)desc)[1] = cpu_to_le64(((u64 *)desc)[1]);
> +#endif
> +}
> +
> +static inline void xgene_enet_le64_to_desc16(struct xgene_enet_desc *desc)
> +{
> +#ifdef CONFIG_CPU_BIG_ENDIAN
> + ((u64 *)desc)[1] = le64_to_cpu(((u64 *)desc)[1]);
> +#endif
> +}

With this do you not risk confusing the hardware by swapping the
format of the descriptors?

Why not use xxx_to_cpu() and cpu_to_xxx() functions when reading or
writing the descriptors? It would also remove a lot of the #ifdef in
this code.

--
Ben Dooks http://www.codethink.co.uk/
Senior Engineer Codethink - Providing Genius


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