target/linux/mvebu/patches-4.19/405-net-phy-marvell10g-add-SFP-support.patch

   1 From 5f3ac54810055fec0cc667bb04c16f783830abff 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: [PATCH] net: phy: marvell10g: add SFP+ support
   5
   6 Add support for SFP+ cages to the Marvell 10G PHY driver. This is
   7 slightly complicated by the way phylib works in that we need to use
   8 a multi-step process to attach the SFP bus, and we also need to track
   9 the phylink state machine to know when the module's transmit disable
  10 signal should change state.
  11
  12 With appropriate DT changes, this allows the SFP+ canges on the
  13 Macchiatobin platform to be functional.
  14
  15 Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
  16 ---
  17  drivers/net/phy/marvell10g.c | 80 ++++++++++++++++++++++++++++++++++++
  18  1 file changed, 80 insertions(+)
  19
  20 --- a/drivers/net/phy/marvell10g.c
  21 +++ b/drivers/net/phy/marvell10g.c
  22 @@ -25,6 +25,8 @@
  23  #include <linux/hwmon.h>
  24  #include <linux/marvell_phy.h>
  25  #include <linux/phy.h>
  26 +#include <linux/property.h>
  27 +#include <linux/sfp.h>
  28
  29  enum {
  30         MV_PMA_BOOT             = 0xc050,
  31 @@ -56,6 +58,11 @@ enum {
  32  };
  33
  34  struct mv3310_priv {
  35 +       struct fwnode_handle *sfp_fwnode;
  36 +       struct sfp_bus *sfp_bus;
  37 +       enum phy_state state;
  38 +       bool running;
  39 +
  40         struct device *hwmon_dev;
  41         char *hwmon_name;
  42  };
  43 @@ -219,6 +226,27 @@ static int mv3310_hwmon_probe(struct phy
  44  }
  45  #endif
  46
  47 +static int mv3310_sfp_insert(void *upstream, const struct sfp_eeprom_id *id)
  48 +{
  49 +       struct phy_device *phydev = upstream;
  50 +       struct mv3310_priv *priv = dev_get_drvdata(&phydev->mdio.dev);
  51 +       __ETHTOOL_DECLARE_LINK_MODE_MASK(support) = { 0, };
  52 +       phy_interface_t iface;
  53 +
  54 +       sfp_parse_support(priv->sfp_bus, id, support);
  55 +       iface = sfp_select_interface(priv->sfp_bus, id, support);
  56 +
  57 +       if (iface != PHY_INTERFACE_MODE_10GKR) {
  58 +               dev_err(&phydev->mdio.dev, "incompatible SFP module inserted\n");
  59 +               return -EINVAL;
  60 +       }
  61 +       return 0;
  62 +}
  63 +
  64 +static const struct sfp_upstream_ops mv3310_sfp_ops = {
  65 +       .module_insert = mv3310_sfp_insert,
  66 +};
  67 +
  68  static int mv3310_probe(struct phy_device *phydev)
  69  {
  70         struct mv3310_priv *priv;
  71 @@ -249,9 +277,30 @@ static int mv3310_probe(struct phy_devic
  72         if (ret)
  73                 return ret;
  74
  75 +       if (phydev->mdio.dev.fwnode) {
  76 +               struct fwnode_reference_args ref;
  77 +               int ret;
  78 +
  79 +               ret = fwnode_property_get_reference_args(phydev->mdio.dev.fwnode,
  80 +                                                        "sfp", NULL, 0, 0,
  81 +                                                        &ref);
  82 +               if (ret == 0)
  83 +                       priv->sfp_fwnode = ref.fwnode;
  84 +       }
  85 +
  86         return 0;
  87  }
  88
  89 +static void mv3310_remove(struct phy_device *phydev)
  90 +{
  91 +       struct mv3310_priv *priv = dev_get_drvdata(&phydev->mdio.dev);
  92 +
  93 +       if (priv->sfp_bus)
  94 +               sfp_unregister_upstream(priv->sfp_bus);
  95 +
  96 +       fwnode_handle_put(priv->sfp_fwnode);
  97 +}
  98 +
  99  static int mv3310_suspend(struct phy_device *phydev)
 100  {
 101         return 0;
 102 @@ -262,8 +311,29 @@ static int mv3310_resume(struct phy_devi
 103         return mv3310_hwmon_config(phydev, true);
 104  }
 105
 106 +static void mv3310_link_change_notify(struct phy_device *phydev)
 107 +{
 108 +       struct mv3310_priv *priv = dev_get_drvdata(&phydev->mdio.dev);
 109 +       enum phy_state state = phydev->state;
 110 +       bool running;
 111 +
 112 +       if (priv->sfp_bus && priv->state != state) {
 113 +               priv->state = state;
 114 +
 115 +               running = state >= PHY_UP && state < PHY_HALTED;
 116 +               if (priv->running != running) {
 117 +                       priv->running = running;
 118 +                       if (running)
 119 +                               sfp_upstream_start(priv->sfp_bus);
 120 +                       else
 121 +                               sfp_upstream_stop(priv->sfp_bus);
 122 +               }
 123 +       }
 124 +}
 125 +
 126  static int mv3310_config_init(struct phy_device *phydev)
 127  {
 128 +       struct mv3310_priv *priv = dev_get_drvdata(&phydev->mdio.dev);
 129         __ETHTOOL_DECLARE_LINK_MODE_MASK(supported) = { 0, };
 130         u32 mask;
 131         int val;
 132 @@ -357,6 +427,14 @@ static int mv3310_config_init(struct phy
 133         phydev->supported &= mask;
 134         phydev->advertising &= phydev->supported;
 135
 136 +       /* Would be nice to do this in the probe function, but unfortunately,
 137 +        * phylib doesn't have phydev->attached_dev set there.
 138 +        */
 139 +       if (priv->sfp_fwnode && !priv->sfp_bus)
 140 +               priv->sfp_bus = sfp_register_upstream(priv->sfp_fwnode,
 141 +                                                     phydev->attached_dev,
 142 +                                                     phydev, &mv3310_sfp_ops);
 143 +
 144         return 0;
 145  }
 146
 147 @@ -566,6 +644,8 @@ static struct phy_driver mv3310_drivers[
 148                 .config_aneg    = mv3310_config_aneg,
 149                 .aneg_done      = mv3310_aneg_done,
 150                 .read_status    = mv3310_read_status,
 151 +               .remove         = mv3310_remove,
 152 +               .link_change_notify = mv3310_link_change_notify,
 153         },
 154  };
 155