2014-05-06 0:40 GMT-07:00 Hubert Chaumette <hchaumette@xxxxxxxxxxxxxxxxxxx>: > Adds support for ksz9031 PAD skew configuration over devicetree. > > Signed-off-by: Hubert Chaumette <hchaumette@xxxxxxxxxxxxxxxxxxx> Reviewed-by: Florian Fainelli <f.fainelli@xxxxxxxxx> > --- > drivers/net/phy/micrel.c | 106 ++++++++++++++++++++++++++++++++++++++++++++++- > 1 file changed, 105 insertions(+), 1 deletion(-) > > diff --git a/drivers/net/phy/micrel.c b/drivers/net/phy/micrel.c > index d849684..bc7c7d2 100644 > --- a/drivers/net/phy/micrel.c > +++ b/drivers/net/phy/micrel.c > @@ -283,6 +283,110 @@ static int ksz9021_config_init(struct phy_device *phydev) > return 0; > } > > +#define MII_KSZ9031RN_MMD_CTRL_REG 0x0d > +#define MII_KSZ9031RN_MMD_REGDATA_REG 0x0e > +#define OP_DATA 1 > +#define KSZ9031_PS_TO_REG 60 > + > +/* Extended registers */ > +#define MII_KSZ9031RN_CONTROL_PAD_SKEW 4 > +#define MII_KSZ9031RN_RX_DATA_PAD_SKEW 5 > +#define MII_KSZ9031RN_TX_DATA_PAD_SKEW 6 > +#define MII_KSZ9031RN_CLK_PAD_SKEW 8 > + > +static int ksz9031_extended_write(struct phy_device *phydev, > + u8 mode, u32 dev_addr, u32 regnum, u16 val) > +{ > + phy_write(phydev, MII_KSZ9031RN_MMD_CTRL_REG, dev_addr); > + phy_write(phydev, MII_KSZ9031RN_MMD_REGDATA_REG, regnum); > + phy_write(phydev, MII_KSZ9031RN_MMD_CTRL_REG, (mode << 14) | dev_addr); > + return phy_write(phydev, MII_KSZ9031RN_MMD_REGDATA_REG, val); > +} > + > +static int ksz9031_extended_read(struct phy_device *phydev, > + u8 mode, u32 dev_addr, u32 regnum) > +{ > + phy_write(phydev, MII_KSZ9031RN_MMD_CTRL_REG, dev_addr); > + phy_write(phydev, MII_KSZ9031RN_MMD_REGDATA_REG, regnum); > + phy_write(phydev, MII_KSZ9031RN_MMD_CTRL_REG, (mode << 14) | dev_addr); > + return phy_read(phydev, MII_KSZ9031RN_MMD_REGDATA_REG); > +} > + > +static int ksz9031_of_load_skew_values(struct phy_device *phydev, > + struct device_node *of_node, > + u16 reg, size_t field_sz, > + char *field[], u8 numfields) > +{ > + int val[4] = {-1, -2, -3, -4}; > + int matches = 0; > + u16 mask; > + u16 maxval; > + u16 newval; > + int i; > + > + for (i = 0; i < numfields; i++) > + if (!of_property_read_u32(of_node, field[i], val + i)) > + matches++; > + > + if (!matches) > + return 0; > + > + if (matches < numfields) > + newval = ksz9031_extended_read(phydev, OP_DATA, 2, reg); > + else > + newval = 0; > + > + maxval = (field_sz == 4) ? 0xf : 0x1f; > + for (i = 0; i < numfields; i++) > + if (val[i] != -(i + 1)) { > + mask = 0xffff; > + mask ^= maxval << (field_sz * i); > + newval = (newval & mask) | > + (((val[i] / KSZ9031_PS_TO_REG) & maxval) > + << (field_sz * i)); > + } > + > + return ksz9031_extended_write(phydev, OP_DATA, 2, reg, newval); > +} > + > +static int ksz9031_config_init(struct phy_device *phydev) > +{ > + struct device *dev = &phydev->dev; > + struct device_node *of_node = dev->of_node; > + char *clk_skews[2] = {"rxc-skew-ps", "txc-skew-ps"}; > + char *rx_data_skews[4] = { > + "rxd0-skew-ps", "rxd1-skew-ps", > + "rxd2-skew-ps", "rxd3-skew-ps" > + }; > + char *tx_data_skews[4] = { > + "txd0-skew-ps", "txd1-skew-ps", > + "txd2-skew-ps", "txd3-skew-ps" > + }; > + char *control_skews[2] = {"txen-skew-ps", "rxdv-skew-ps"}; > + > + if (!of_node && dev->parent->of_node) > + of_node = dev->parent->of_node; > + > + if (of_node) { > + ksz9031_of_load_skew_values(phydev, of_node, > + MII_KSZ9031RN_CLK_PAD_SKEW, 5, > + clk_skews, 2); > + > + ksz9031_of_load_skew_values(phydev, of_node, > + MII_KSZ9031RN_CONTROL_PAD_SKEW, 4, > + control_skews, 2); > + > + ksz9031_of_load_skew_values(phydev, of_node, > + MII_KSZ9031RN_RX_DATA_PAD_SKEW, 4, > + rx_data_skews, 4); > + > + ksz9031_of_load_skew_values(phydev, of_node, > + MII_KSZ9031RN_TX_DATA_PAD_SKEW, 4, > + tx_data_skews, 4); > + } > + return 0; > +} > + > #define KSZ8873MLL_GLOBAL_CONTROL_4 0x06 > #define KSZ8873MLL_GLOBAL_CONTROL_4_DUPLEX (1 << 6) > #define KSZ8873MLL_GLOBAL_CONTROL_4_SPEED (1 << 4) > @@ -469,7 +573,7 @@ static struct phy_driver ksphy_driver[] = { > .features = (PHY_GBIT_FEATURES | SUPPORTED_Pause > | SUPPORTED_Asym_Pause), > .flags = PHY_HAS_MAGICANEG | PHY_HAS_INTERRUPT, > - .config_init = kszphy_config_init, > + .config_init = ksz9031_config_init, > .config_aneg = genphy_config_aneg, > .read_status = genphy_read_status, > .ack_interrupt = kszphy_ack_interrupt, > -- > 2.0.0.rc0 > -- Florian -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html