target/linux/ipq806x/patches-4.9/906-net-dsa-qca8k-allow-swapping-of-mac0-and-mac6.patch

   1 From fd18a10a9f172dcc78629669ce60304924c5a2fb Mon Sep 17 00:00:00 2001
   2 From: John Crispin <john@phrozen.org>
   3 Date: Thu, 15 Dec 2016 04:40:55 +0100
   4 Subject: [PATCH 17/22] net: dsa: qca8k: allow swapping of mac0 and mac6
   5
   6 The switch allows us to swap the internal wirering of the two cpu ports.
   7 For the HW offloading to work the ethernet MAC conencting to the LAN
   8 ports must be wired to cpu port 0. There is HW in the wild that does not
   9 fulfill this requirement. On these boards we need to swap the cpu ports.
  10
  11 Signed-off-by: John Crispin <john@phrozen.org>
  12 ---
  13  drivers/net/dsa/qca8k.c |   15 +++++++++++++++
  14  1 file changed, 15 insertions(+)
  15
  16 Index: linux-4.9.34/drivers/net/dsa/qca8k.c
  17 ===================================================================
  18 --- linux-4.9.34.orig/drivers/net/dsa/qca8k.c
  19 +++ linux-4.9.34/drivers/net/dsa/qca8k.c
  20 @@ -518,6 +518,18 @@ qca8k_port_set_status(struct qca8k_priv
  21                 qca8k_reg_clear(priv, QCA8K_REG_PORT_STATUS(port), mask);
  22  }
  23
  24 +static void
  25 +qca8k_exchange_mac06(struct qca8k_priv *priv, struct device_node *np)
  26 +{
  27 +       u32 val = qca8k_read(priv, QCA8K_REG_PORT0_PAD_CTRL);
  28 +
  29 +       if (of_property_read_bool(np, "qca,exchange_mac06"))
  30 +               val |= QCA8K_PORT0_PAD_CTRL_MAC06_EXCHG;
  31 +       else
  32 +               val &= ~QCA8K_PORT0_PAD_CTRL_MAC06_EXCHG;
  33 +       qca8k_write(priv, QCA8K_REG_PORT0_PAD_CTRL, val);
  34 +}
  35 +
  36  static int
  37  qca8k_setup(struct dsa_switch *ds)
  38  {
  39 @@ -538,6 +550,9 @@ qca8k_setup(struct dsa_switch *ds)
  40         if (IS_ERR(priv->regmap))
  41                 pr_warn("regmap initialization failed");
  42
  43 +       /* Exchange MAC0 and MAC6 */
  44 +       qca8k_exchange_mac06(priv, priv->ds->dev->of_node);
  45 +
  46         /* Initialize CPU port pad mode (xMII type, delays...) */
  47         phy_mode = of_get_phy_mode(ds->ports[ds->dst->cpu_port].dn);
  48         if (phy_mode < 0) {