target/linux/mvebu/patches-4.14/410-sfp-hack-allow-marvell-10G-phy-support-to-use-SFP.patch

   1 From 4a4aca08b11501cb1b2c509113bbb65eb66a1f45 Mon Sep 17 00:00:00 2001
   2 From: Russell King <rmk+kernel@armlinux.org.uk>
   3 Date: Fri, 14 Apr 2017 14:21:25 +0100
   4 Subject: sfp: hack: allow marvell 10G phy support to use SFP
   5
   6 Allow the Marvell 10G PHY to register with the SFP bus, so that SFP+
   7 cages can work.  This bypasses phylink, meaning that socket status
   8 is not taken into account for the link state.  Also, the tx-disable
   9 signal must be commented out in DT for this to work...
  10
  11 Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
  12 ---
  13  drivers/net/phy/marvell10g.c | 54 +++++++++++++++++++++++++++++++++++++++++++-
  14  1 file changed, 53 insertions(+), 1 deletion(-)
  15
  16 --- a/drivers/net/phy/marvell10g.c
  17 +++ b/drivers/net/phy/marvell10g.c
  18 @@ -15,8 +15,10 @@
  19   * If both the fiber and copper ports are connected, the first to gain
  20   * link takes priority and the other port is completely locked out.
  21   */
  22 +#include <linux/of.h>
  23  #include <linux/phy.h>
  24  #include <linux/marvell_phy.h>
  25 +#include <linux/sfp.h>
  26
  27  enum {
  28         MV_PCS_BASE_T           = 0x0000,
  29 @@ -38,6 +40,11 @@ enum {
  30         MV_AN_RESULT_SPD_10000  = BIT(15),
  31  };
  32
  33 +struct mv3310_priv {
  34 +       struct device_node *sfp_node;
  35 +       struct sfp_bus *sfp_bus;
  36 +};
  37 +
  38  static int mv3310_modify(struct phy_device *phydev, int devad, u16 reg,
  39                          u16 mask, u16 bits)
  40  {
  41 @@ -56,17 +63,52 @@ static int mv3310_modify(struct phy_devi
  42         return ret < 0 ? ret : 1;
  43  }
  44
  45 +static int mv3310_sfp_insert(void *upstream, const struct sfp_eeprom_id *id)
  46 +{
  47 +       struct phy_device *phydev = upstream;
  48 +       struct mv3310_priv *priv = dev_get_drvdata(&phydev->mdio.dev);
  49 +
  50 +       if (sfp_parse_interface(priv->sfp_bus, id) != PHY_INTERFACE_MODE_10GKR) {
  51 +               dev_err(&phydev->mdio.dev, "incompatible SFP module inserted\n");
  52 +               return -EINVAL;
  53 +       }
  54 +       return 0;
  55 +}
  56 +
  57 +static const struct sfp_upstream_ops mv3310_sfp_ops = {
  58 +       .module_insert = mv3310_sfp_insert,
  59 +};
  60 +
  61  static int mv3310_probe(struct phy_device *phydev)
  62  {
  63 +       struct mv3310_priv *priv;
  64         u32 mmd_mask = MDIO_DEVS_PMAPMD | MDIO_DEVS_AN;
  65
  66         if (!phydev->is_c45 ||
  67             (phydev->c45_ids.devices_in_package & mmd_mask) != mmd_mask)
  68                 return -ENODEV;
  69
  70 +       priv = devm_kzalloc(&phydev->mdio.dev, sizeof(*priv), GFP_KERNEL);
  71 +       if (!priv)
  72 +               return -ENOMEM;
  73 +
  74 +       dev_set_drvdata(&phydev->mdio.dev, priv);
  75 +
  76 +       if (phydev->mdio.dev.of_node)
  77 +               priv->sfp_node = of_parse_phandle(phydev->mdio.dev.of_node,
  78 +                                                 "sfp", 0);
  79 +
  80         return 0;
  81  }
  82
  83 +static void mv3310_remove(struct phy_device *phydev)
  84 +{
  85 +       struct mv3310_priv *priv = dev_get_drvdata(&phydev->mdio.dev);
  86 +
  87 +       if (priv->sfp_bus)
  88 +               sfp_unregister_upstream(priv->sfp_bus);
  89 +}
  90 +
  91  /*
  92   * Resetting the MV88X3310 causes it to become non-responsive.  Avoid
  93   * setting the reset bit(s).
  94 @@ -78,6 +120,7 @@ static int mv3310_soft_reset(struct phy_
  95
  96  static int mv3310_config_init(struct phy_device *phydev)
  97  {
  98 +       struct mv3310_priv *priv = dev_get_drvdata(&phydev->mdio.dev);
  99         __ETHTOOL_DECLARE_LINK_MODE_MASK(supported) = { 0, };
 100         u32 mask;
 101         int val;
 102 @@ -166,6 +209,14 @@ static int mv3310_config_init(struct phy
 103         phydev->supported &= mask;
 104         phydev->advertising &= phydev->supported;
 105
 106 +       /* Would be nice to do this in the probe function, but unfortunately,
 107 +        * phylib doesn't have phydev->attached_dev set there.
 108 +        */
 109 +       if (priv->sfp_node && !priv->sfp_bus)
 110 +               priv->sfp_bus = sfp_register_upstream(priv->sfp_node,
 111 +                                                     phydev->attached_dev,
 112 +                                                     phydev, &mv3310_sfp_ops);
 113 +
 114         return 0;
 115  }
 116
 117 @@ -349,12 +400,13 @@ static struct phy_driver mv3310_drivers[
 118                                   SUPPORTED_FIBRE |
 119                                   SUPPORTED_10000baseT_Full |
 120                                   SUPPORTED_Backplane,
 121 -               .probe          = mv3310_probe,
 122                 .soft_reset     = mv3310_soft_reset,
 123                 .config_init    = mv3310_config_init,
 124 +               .probe          = mv3310_probe,
 125                 .config_aneg    = mv3310_config_aneg,
 126                 .aneg_done      = mv3310_aneg_done,
 127                 .read_status    = mv3310_read_status,
 128 +               .remove         = mv3310_remove,
 129         },
 130  };
 131