target/linux/ramips/patches-5.4/991-at803x.patch

   1 From 924453aa9d2324e5611f8e2b71df746d8f0c79f1 Mon Sep 17 00:00:00 2001
   2 From: =?UTF-8?q?Ren=C3=A9=20van=20Dorst?= <opensource@vdorst.com>
   3 Date: Fri, 13 Nov 2020 16:11:32 +0100
   4 Subject: [PATCH] net: phy: at803x: add support for SFP module in
   5  RGMII-to-x-base mode
   6 MIME-Version: 1.0
   7 Content-Type: text/plain; charset=UTF-8
   8 Content-Transfer-Encoding: 8bit
   9
  10 Signed-off-by: René van Dorst <opensource@vdorst.com>
  11 ---
  12  drivers/net/phy/at803x.c | 91 ++++++++++++++++++++++++++++++++++++++++
  13  1 file changed, 91 insertions(+)
  14
  15 diff --git a/drivers/net/phy/at803x.c b/drivers/net/phy/at803x.c
  16 index 31cd7d8a5a1b5..134c894ccf800 100644
  17 --- a/drivers/net/phy/at803x.c
  18 +++ b/drivers/net/phy/at803x.c
  19 @@ -14,6 +14,8 @@
  20  #include <linux/etherdevice.h>
  21  #include <linux/of_gpio.h>
  22  #include <linux/gpio/consumer.h>
  23 +#include <linux/sfp.h>
  24 +#include <linux/phylink.h>
  25
  26  #define AT803X_SPECIFIC_STATUS                 0x11
  27  #define AT803X_SS_SPEED_MASK                   (3 << 14)
  28 @@ -53,9 +55,18 @@
  29
  30  #define AT803X_MODE_CFG_MASK                   0x0F
  31  #define AT803X_MODE_CFG_SGMII                  0x01
  32 +#define AT803X_MODE_CFG_BX1000_RGMII_50                0x02
  33 +#define AT803X_MODE_CFG_BX1000_RGMII_75                0x03
  34 +#define AT803X_MODE_FIBER                      0x01
  35 +#define AT803X_MODE_COPPER                     0x00
  36
  37  #define AT803X_PSSR                    0x11    /*PHY-Specific Status Register*/
  38  #define AT803X_PSSR_MR_AN_COMPLETE     0x0200
  39 +#define         PSSR_LINK                      BIT(10)
  40 +#define         PSSR_SYNC_STATUS               BIT(8)
  41 +#define         PSSR_DUPLEX                    BIT(13)
  42 +#define         PSSR_SPEED_1000                BIT(15)
  43 +#define         PSSR_SPEED_100                 BIT(14)
  44
  45  #define AT803X_DEBUG_REG_0                     0x00
  46  #define AT803X_DEBUG_RX_CLK_DLY_EN             BIT(15)
  47 @@ -243,10 +254,72 @@ static int at803x_resume(struct phy_device *phydev)
  48         return phy_modify(phydev, MII_BMCR, BMCR_PDOWN | BMCR_ISOLATE, 0);
  49  }
  50
  51 +static int at803x_mode(struct phy_device *phydev)
  52 +{
  53 +       int mode;
  54 +
  55 +       mode = phy_read(phydev, AT803X_REG_CHIP_CONFIG) & AT803X_MODE_CFG_MASK;
  56 +
  57 +       if (mode == AT803X_MODE_CFG_BX1000_RGMII_50 ||
  58 +           mode == AT803X_MODE_CFG_BX1000_RGMII_75)
  59 +               return AT803X_MODE_FIBER;
  60 +       return AT803X_MODE_COPPER;
  61 +}
  62 +
  63 +static int at803x_sfp_insert(void *upstream, const struct sfp_eeprom_id *id)
  64 +{
  65 +       __ETHTOOL_DECLARE_LINK_MODE_MASK(at803x_support) = { 0, };
  66 +       __ETHTOOL_DECLARE_LINK_MODE_MASK(support) = { 0, };
  67 +       struct phy_device *phydev = upstream;
  68 +       phy_interface_t iface;
  69 +
  70 +       phylink_set(at803x_support, 1000baseX_Full);
  71 +       /* AT803x only support 1000baseX but SGMII works fine when module runs
  72 +        * at 1Gbit.
  73 +        */
  74 +       phylink_set(at803x_support, 1000baseT_Full);
  75 +
  76 +       sfp_parse_support(phydev->sfp_bus, id, support);
  77 +
  78 +       // Limit to interfaces that both sides support
  79 +       linkmode_and(support, support, at803x_support);
  80 +
  81 +       if (linkmode_empty(support))
  82 +               goto unsupported_mode;
  83 +
  84 +       iface = sfp_select_interface(phydev->sfp_bus, support);
  85 +
  86 +       if (iface != PHY_INTERFACE_MODE_SGMII &&
  87 +           iface != PHY_INTERFACE_MODE_1000BASEX)
  88 +               goto unsupported_mode;
  89 +
  90 +       dev_info(&phydev->mdio.dev, "SFP interface %s", phy_modes(iface));
  91 +
  92 +       return 0;
  93 +
  94 +unsupported_mode:
  95 +       dev_info(&phydev->mdio.dev, "incompatible SFP module inserted;"
  96 +                "Only SGMII at 1Gbit/1000BASEX are supported!\n");
  97 +       return -EINVAL;
  98 +}
  99 +
 100 +static const struct sfp_upstream_ops at803x_sfp_ops = {
 101 +       .attach = phy_sfp_attach,
 102 +       .detach = phy_sfp_detach,
 103 +       .module_insert = at803x_sfp_insert,
 104 +};
 105 +
 106  static int at803x_probe(struct phy_device *phydev)
 107  {
 108         struct device *dev = &phydev->mdio.dev;
 109         struct at803x_priv *priv;
 110 +       int ret;
 111 +
 112 +       if (at803x_mode(phydev) == AT803X_MODE_FIBER) {
 113 +               ret = phy_sfp_probe(phydev, &at803x_sfp_ops);
 114 +               if (ret < 0)
 115 +                       return ret;
 116 +       }
 117
 118         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 119         if (!priv)
 120 @@ -394,6 +467,10 @@ static int at803x_read_status(struct phy_device *phydev)
 121  {
 122         int ss, err, old_link = phydev->link;
 123
 124 +       /* Handle (Fiber) SGMII to RGMII mode */
 125 +       if (at803x_mode(phydev) == AT803X_MODE_FIBER)
 126 +               return genphy_c37_read_status(phydev);
 127 +
 128         /* Update the link, but return if there was an error */
 129         err = genphy_update_link(phydev);
 130         if (err)
 131 @@ -448,6 +525,19 @@ static int at803x_read_status(struct phy_device *phydev)
 132         return 0;
 133  }
 134
 135 +static int at803x_config_aneg(struct phy_device *phydev)
 136 +{
 137 +       /* Handle (Fiber) SerDes to RGMII mode */
 138 +       if (at803x_mode(phydev) == AT803X_MODE_FIBER) {
 139 +               pr_warn("%s: fiber\n", __func__);
 140 +               return genphy_c37_config_aneg(phydev);
 141 +       }
 142 +
 143 +       pr_warn("%s: enter\n", __func__);
 144 +
 145 +       return genphy_config_aneg(phydev);
 146 +}
 147 +
 148  static struct phy_driver at803x_driver[] = {
 149  {
 150         /* ATHEROS 8035 */
 151 @@ -491,6 +581,7 @@ static struct phy_driver at803x_driver[] = {
 152         .suspend                = at803x_suspend,
 153         .resume                 = at803x_resume,
 154         /* PHY_GBIT_FEATURES */
 155 +       .config_aneg            = at803x_config_aneg,
 156         .read_status            = at803x_read_status,
 157         .aneg_done              = at803x_aneg_done,
 158         .ack_interrupt          = &at803x_ack_interrupt,