target/linux/layerscape/patches-5.4/701-net-0378-mii-Add-helpers-for-parsing-SGMII-auto-negotiation.patch

   1 From 4f3ba90c37ec5aedd2227beb013bab59035fbb57 Mon Sep 17 00:00:00 2001
   2 From: Vladimir Oltean <vladimir.oltean@nxp.com>
   3 Date: Mon, 30 Sep 2019 19:20:26 +0300
   4 Subject: [PATCH] mii: Add helpers for parsing SGMII auto-negotiation
   5
   6 Typically a MAC PCS auto-configures itself after it receives the
   7 negotiated copper-side link settings from the PHY, but some MAC devices
   8 are more special and need manual interpretation of the SGMII AN result.
   9
  10 In other cases, the PCS exposes the entire tx_config_reg base page as it
  11 is transmitted on the wire during auto-negotiation, so it makes sense to
  12 be able to decode the equivalent lp_advertised bit mask from the raw u16
  13 (of course, "lp" considering the PCS to be the local PHY).
  14
  15 Therefore, add the bit definitions for the SGMII registers 4 and 5
  16 (local device ability, link partner ability), as well as a link_mode
  17 conversion helper that can be used to feed the AN results into
  18 phy_resolve_aneg_linkmode.
  19
  20 Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
  21 ---
  22  include/linux/mii.h      | 50 ++++++++++++++++++++++++++++++++++++++++++++++++
  23  include/uapi/linux/mii.h | 12 ++++++++++++
  24  2 files changed, 62 insertions(+)
  25
  26 --- a/include/linux/mii.h
  27 +++ b/include/linux/mii.h
  28 @@ -373,6 +373,56 @@ static inline u32 mii_lpa_to_ethtool_lpa
  29  }
  30
  31  /**
  32 + * mii_lpa_mod_linkmode_adv_sgmii
  33 + * @lp_advertising: pointer to destination link mode.
  34 + * @lpa: value of the MII_LPA register
  35 + *
  36 + * A small helper function that translates MII_LPA bits to
  37 + * linkmode advertisement settings for SGMII.
  38 + * Leaves other bits unchanged.
  39 + */
  40 +static inline void
  41 +mii_lpa_mod_linkmode_lpa_sgmii(unsigned long *lp_advertising, u32 lpa)
  42 +{
  43 +       u32 speed_duplex = lpa & LPA_SGMII_DPX_SPD_MASK;
  44 +
  45 +       linkmode_mod_bit(ETHTOOL_LINK_MODE_1000baseT_Half_BIT, lp_advertising,
  46 +                        speed_duplex == LPA_SGMII_1000HALF);
  47 +
  48 +       linkmode_mod_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT, lp_advertising,
  49 +                        speed_duplex == LPA_SGMII_1000FULL);
  50 +
  51 +       linkmode_mod_bit(ETHTOOL_LINK_MODE_100baseT_Half_BIT, lp_advertising,
  52 +                        speed_duplex == LPA_SGMII_100HALF);
  53 +
  54 +       linkmode_mod_bit(ETHTOOL_LINK_MODE_100baseT_Full_BIT, lp_advertising,
  55 +                        speed_duplex == LPA_SGMII_100FULL);
  56 +
  57 +       linkmode_mod_bit(ETHTOOL_LINK_MODE_10baseT_Half_BIT, lp_advertising,
  58 +                        speed_duplex == LPA_SGMII_10HALF);
  59 +
  60 +       linkmode_mod_bit(ETHTOOL_LINK_MODE_10baseT_Full_BIT, lp_advertising,
  61 +                        speed_duplex == LPA_SGMII_10FULL);
  62 +}
  63 +
  64 +/**
  65 + * mii_lpa_to_linkmode_adv_sgmii
  66 + * @advertising: pointer to destination link mode.
  67 + * @lpa: value of the MII_LPA register
  68 + *
  69 + * A small helper function that translates MII_ADVERTISE bits
  70 + * to linkmode advertisement settings when in SGMII mode.
  71 + * Clears the old value of advertising.
  72 + */
  73 +static inline void mii_lpa_to_linkmode_lpa_sgmii(unsigned long *lp_advertising,
  74 +                                                u32 lpa)
  75 +{
  76 +       linkmode_zero(lp_advertising);
  77 +
  78 +       mii_lpa_mod_linkmode_lpa_sgmii(lp_advertising, lpa);
  79 +}
  80 +
  81 +/**
  82   * mii_adv_mod_linkmode_adv_t
  83   * @advertising:pointer to destination link mode.
  84   * @adv: value of the MII_ADVERTISE register
  85 --- a/include/uapi/linux/mii.h
  86 +++ b/include/uapi/linux/mii.h
  87 @@ -131,6 +131,18 @@
  88  #define NWAYTEST_LOOPBACK      0x0100  /* Enable loopback for N-way   */
  89  #define NWAYTEST_RESV2         0xfe00  /* Unused...                   */
  90
  91 +/* MAC and PHY tx_config_Reg[15:0] for SGMII in-band auto-negotiation.*/
  92 +#define ADVERTISE_SGMII                0x0001  /* MAC can do SGMII            */
  93 +#define LPA_SGMII              0x0001  /* PHY can do SGMII            */
  94 +#define LPA_SGMII_DPX_SPD_MASK 0x1C00  /* SGMII duplex and speed bits */
  95 +#define LPA_SGMII_10HALF       0x0000  /* Can do 10mbps half-duplex   */
  96 +#define LPA_SGMII_10FULL       0x1000  /* Can do 10mbps full-duplex   */
  97 +#define LPA_SGMII_100HALF      0x0400  /* Can do 100mbps half-duplex  */
  98 +#define LPA_SGMII_100FULL      0x1400  /* Can do 100mbps full-duplex  */
  99 +#define LPA_SGMII_1000HALF     0x0800  /* Can do 1000mbps half-duplex */
 100 +#define LPA_SGMII_1000FULL     0x1800  /* Can do 1000mbps full-duplex */
 101 +#define LPA_SGMII_LINK         0x8000  /* PHY link with copper-side partner */
 102 +
 103  /* 1000BASE-T Control register */
 104  #define ADVERTISE_1000FULL     0x0200  /* Advertise 1000BASE-T full duplex */
 105  #define ADVERTISE_1000HALF     0x0100  /* Advertise 1000BASE-T half duplex */