[RFC PATCH v3 2/2] net: phy: Add gmiitorgmii converter support

[zhuyj]

+       switch (phydev->speed) {
+       case SPEED_1000:
+               val |= BMCR_SPEED1000;
+       case SPEED_100:
+               val |= BMCR_SPEED100;
+       }

Are there only 2 kinds of speed?


On Thu, Aug 4, 2016 at 8:13 PM, Kedareswara rao Appana
<appana.durga.rao at xilinx.com> wrote:
> This patch adds support for gmiitorgmii converter.
>
> The GMII to RGMII IP core provides the Reduced Gigabit Media
> Independent Interface (RGMII) between Ethernet physical media
> Devices and the Gigabit Ethernet controller. This core can
> Switch dynamically between the three different speed modes of
> Operation by configuring the converter register through mdio write.
>
> MDIO interface is used to set operating speed of Ethernet MAC.
>
> Signed-off-by: Kedareswara rao Appana <appanad at xilinx.com>
> ---
> Thanks a lot Andrew for your inputs.
> Changes for v3:
> --> Updated the driver as suggested by Andrew.
> Changes for v2:
> --> Passed struct xphy pointer directly to the fix_mac_speed
> API as suggested by the Florian.
> --> Added checks for the phy-node fail case as suggested
> by the Florian
>
>  drivers/net/phy/Kconfig             |   8 +++
>  drivers/net/phy/Makefile            |   1 +
>  drivers/net/phy/xilinx_gmii2rgmii.c | 121 ++++++++++++++++++++++++++++++++++++
>  3 files changed, 130 insertions(+)
>  create mode 100644 drivers/net/phy/xilinx_gmii2rgmii.c
>
> diff --git a/drivers/net/phy/Kconfig b/drivers/net/phy/Kconfig
> index 6dad9a9..eec31a3 100644
> --- a/drivers/net/phy/Kconfig
> +++ b/drivers/net/phy/Kconfig
> @@ -271,6 +271,14 @@ config MDIO_BCM_IPROC
>           This module provides a driver for the MDIO busses found in the
>           Broadcom iProc SoC's.
>
> +config XILINX_GMII2RGMII
> +       tristate "Xilinx GMII2RGMII converter driver"
> +       default y
> +       ---help---
> +         This driver support xilinx GMII to RGMII IP core it provides
> +         the Reduced Gigabit Media Independent Interface(RGMII) between
> +         Ethernet physical media devices and the Gigabit Ethernet controller.
> +
>  endif # PHYLIB
>
>  config MICREL_KS8995MA
> diff --git a/drivers/net/phy/Makefile b/drivers/net/phy/Makefile
> index fcdbb92..8650067 100644
> --- a/drivers/net/phy/Makefile
> +++ b/drivers/net/phy/Makefile
> @@ -44,3 +44,4 @@ obj-$(CONFIG_MDIO_MOXART)     += mdio-moxart.o
>  obj-$(CONFIG_MDIO_BCM_UNIMAC)  += mdio-bcm-unimac.o
>  obj-$(CONFIG_MICROCHIP_PHY)    += microchip.o
>  obj-$(CONFIG_MDIO_BCM_IPROC)   += mdio-bcm-iproc.o
> +obj-$(CONFIG_XILINX_GMII2RGMII) += xilinx_gmii2rgmii.o
> diff --git a/drivers/net/phy/xilinx_gmii2rgmii.c b/drivers/net/phy/xilinx_gmii2rgmii.c
> new file mode 100644
> index 0000000..56a655a9
> --- /dev/null
> +++ b/drivers/net/phy/xilinx_gmii2rgmii.c
> @@ -0,0 +1,121 @@
> +/* Xilinx GMII2RGMII Converter driver
> + *
> + * Copyright (C) 2016 Xilinx, Inc.
> + *
> + * Author: Kedareswara rao Appana <appanad at xilinx.com>
> + *
> + * Description:
> + * This driver is developed for Xilinx GMII2RGMII Converter
> + *
> + * This program is free software: you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation, either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +#include <linux/module.h>
> +#include <linux/kernel.h>
> +#include <linux/mii.h>
> +#include <linux/mdio.h>
> +#include <linux/phy.h>
> +#include <linux/of_mdio.h>
> +
> +#define XILINX_GMII2RGMII_REG  0x10
> +
> +struct gmii2rgmii {
> +       struct phy_device *phy_dev;
> +       struct phy_driver *phy_drv;
> +       struct phy_driver conv_phy_drv;
> +       int addr;
> +};
> +
> +static int xgmiitorgmii_read_status(struct phy_device *phydev)
> +{
> +       struct gmii2rgmii *priv = (struct gmii2rgmii *)phydev->priv;
> +       u16 val = 0;
> +
> +       priv->phy_drv->read_status(phydev);
> +
> +       val = mdiobus_read(phydev->mdio.bus, priv->addr, XILINX_GMII2RGMII_REG);
> +
> +       switch (phydev->speed) {
> +       case SPEED_1000:
> +               val |= BMCR_SPEED1000;
> +       case SPEED_100:
> +               val |= BMCR_SPEED100;
> +       }
> +
> +       mdiobus_write(phydev->mdio.bus, priv->addr, XILINX_GMII2RGMII_REG, val);
> +
> +       return 0;
> +}
> +
> +int xgmiitorgmii_probe(struct mdio_device *mdiodev)
> +{
> +       struct device *dev = &mdiodev->dev;
> +       struct device_node *np = dev->of_node, *phy_node;
> +       struct gmii2rgmii *priv;
> +       int ret;
> +
> +       priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
> +       if (!priv)
> +               return -ENOMEM;
> +
> +       phy_node = of_parse_phandle(np, "phy-handle", 0);
> +       if (IS_ERR(phy_node)) {
> +               dev_err(dev, "Couldn't parse phy-handle\n");
> +               ret = -ENODEV;
> +               goto out;
> +       }
> +
> +       priv->phy_dev = of_phy_find_device(phy_node);
> +       if (!priv->phy_dev) {
> +               ret = -EPROBE_DEFER;
> +               dev_info(dev, "Couldn't find phydev\n");
> +               goto out;
> +       }
> +
> +       priv->addr = mdiodev->addr;
> +       priv->phy_drv = priv->phy_dev->drv;
> +       memcpy(&priv->conv_phy_drv, priv->phy_dev->drv,
> +              sizeof(struct phy_driver));
> +       priv->conv_phy_drv.read_status = xgmiitorgmii_read_status;
> +       priv->phy_dev->priv = priv;
> +       priv->phy_dev->drv = &priv->conv_phy_drv;
> +
> +       return 0;
> +out:
> +       return ret;
> +}
> +
> +static const struct of_device_id xgmiitorgmii_of_match[] = {
> +       { .compatible = "xilinx,gmiitorgmii" },
> +};
> +MODULE_DEVICE_TABLE(of, xgmiitorgmii_of_match);
> +
> +static struct mdio_driver xgmiitorgmii_driver = {
> +       .probe  = xgmiitorgmii_probe,
> +       .mdiodrv.driver = {
> +               .name = "xgmiitorgmii",
> +               .of_match_table = xgmiitorgmii_of_match,
> +       },
> +};
> +
> +static int __init xgmiitorgmii_init(void)
> +{
> +       return mdio_driver_register(&xgmiitorgmii_driver);
> +}
> +module_init(xgmiitorgmii_init);
> +
> +static void __exit xgmiitorgmii_cleanup(void)
> +{
> +       mdio_driver_unregister(&xgmiitorgmii_driver);
> +}
> +module_exit(xgmiitorgmii_cleanup);
> +
> +MODULE_DESCRIPTION("Xilinx GMII2RGMII converter driver");
> +MODULE_LICENSE("GPL");
> --
> 2.1.2
>