[PATCH 2/2] net-next: stmmac: add mdio clause 45 access from mac device for dwmac4

Biao Huang
2019-04-29T06:35:24Z

add clause 45 mdio read and write from mac device for dwmac4.

Signed-off-by: Biao Huang <biao.huang@mediatek.com>
---
drivers/net/ethernet/stmicro/stmmac/common.h | 11 +-
drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c | 3 +
drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c | 167 +++++++++++++++++++--
3 files changed, 165 insertions(+), 16 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/common.h b/drivers/net/ethernet/stmicro/stmmac/common.h
index 709dcec..06573b3 100644
--- a/drivers/net/ethernet/stmicro/stmmac/common.h
+++ b/drivers/net/ethernet/stmicro/stmmac/common.h
@@ -410,12 +410,15 @@ struct mac_link {
struct mii_regs {
unsigned int addr; /* MII Address */
unsigned int data; /* MII Data */
- unsigned int addr_shift; /* MII address shift */
- unsigned int reg_shift; /* MII reg shift */
- unsigned int addr_mask; /* MII address mask */
- unsigned int reg_mask; /* MII reg mask */
+ unsigned int addr_shift; /* PHY address shift */
+ unsigned int cl45_reg_shift; /* CL45 reg address shift */
+ unsigned int reg_shift; /* CL22 reg/CL45 dev shift */
+ unsigned int addr_mask; /* PHY address mask */
+ unsigned int cl45_reg_mask; /* CL45 reg mask */
+ unsigned int reg_mask; /* CL22 reg/CL45 dev mask */
unsigned int clk_csr_shift;
unsigned int clk_csr_mask;
+ unsigned int cl45_en; /* CL45 Enable*/
};

struct mac_device_info {
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c b/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c
index 2a41c64..1ca03f9 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c
@@ -835,6 +835,9 @@ int dwmac4_setup(struct stmmac_priv *priv)
mac->mii.reg_mask = GENMASK(20, 16);
mac->mii.clk_csr_shift = 8;
mac->mii.clk_csr_mask = GENMASK(11, 8);
+ mac->mii.cl45_reg_shift = 16;
+ mac->mii.cl45_reg_mask = GENMASK(31, 16);
+ mac->mii.cl45_en = BIT(1);

return 0;
}
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
index bdd3515..a70c967 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
@@ -150,16 +150,16 @@ static int stmmac_xgmac2_mdio_write(struct mii_bus *bus, int phyaddr,
}

/**
- * stmmac_mdio_read
+ * stmmac_c22_read
* @bus: points to the mii_bus structure
- * @phyaddr: MII addr
- * @phyreg: MII reg
- * Description: it reads data from the MII register from within the phy device.
+ * @phyaddr: clause 22 phy address
+ * @phyreg: clause 22 phy register
+ * Description: it reads data from the MII register follow clause 22.
* For the 7111 GMAC, we must set the bit 0 in the MII address register while
* accessing the PHY registers.
* Fortunately, it seems this has no drawback for the 7109 MAC.
*/
-static int stmmac_mdio_read(struct mii_bus *bus, int phyaddr, int phyreg)
+static int stmmac_c22_read(struct mii_bus *bus, int phyaddr, int phyreg)
{
struct net_device *ndev = bus->priv;
struct stmmac_priv *priv = netdev_priv(ndev);
@@ -194,15 +194,15 @@ static int stmmac_mdio_read(struct mii_bus *bus, int phyaddr, int phyreg)
}

/**
- * stmmac_mdio_write
+ * stmmac_c22_write
* @bus: points to the mii_bus structure
- * @phyaddr: MII addr
- * @phyreg: MII reg
- * @phydata: phy data
- * Description: it writes the data into the MII register from within the device.
+ * @phyaddr: clause-22 phy address
+ * @phyreg: clause-22 phy register
+ * @phydata: clause-22 phy data
+ * Description: it writes the data into the MII register follow clause 22.
*/
-static int stmmac_mdio_write(struct mii_bus *bus, int phyaddr, int phyreg,
- u16 phydata)
+static int stmmac_c22_write(struct mii_bus *bus, int phyaddr, int phyreg,
+ u16 phydata)
{
struct net_device *ndev = bus->priv;
struct stmmac_priv *priv = netdev_priv(ndev);
@@ -237,6 +237,149 @@ static int stmmac_mdio_write(struct mii_bus *bus, int phyaddr, int phyreg,
}

/**
+ * stmmac_c45_read
+ * @bus: points to the mii_bus structure
+ * @phyaddr: clause-45 phy address
+ * @devad: clause-45 device address
+ * @prtad: clause-45 register address
+ * @phydata: phy data
+ * Description: it reads the data from the MII register follow clause 45.
+ */
+static int stmmac_c45_read(struct mii_bus *bus, int phyaddr,
+ int devad, int prtad)
+{
+ struct net_device *ndev = bus->priv;
+ struct stmmac_priv *priv = netdev_priv(ndev);
+ unsigned int mii_address = priv->hw->mii.addr;
+ unsigned int mii_data = priv->hw->mii.data;
+ u32 v, value;
+ int data;
+
+ if (readl_poll_timeout(priv->ioaddr + mii_address, v, !(v & MII_BUSY),
+ 100, 10000))
+ return -EIO;
+
+ value = 0;
+ value |= (prtad << priv->hw->mii.cl45_reg_shift)
+ & priv->hw->mii.cl45_reg_mask;
+ writel(value, priv->ioaddr + mii_data);
+
+ /* delay 2ms to avoid error value of get_phy_c45_devs_in_pkg */
+ mdelay(2);
+
+ value = MII_BUSY;
+ value |= (phyaddr << priv->hw->mii.addr_shift)
+ & priv->hw->mii.addr_mask;
+ value |= (devad << priv->hw->mii.reg_shift) & priv->hw->mii.reg_mask;
+ value |= (priv->clk_csr << priv->hw->mii.clk_csr_shift)
+ & priv->hw->mii.clk_csr_mask;
+ if (priv->plat->has_gmac4) {
+ value |= MII_GMAC4_READ;
+ value |= priv->hw->mii.cl45_en;
+ }
+ writel(value, priv->ioaddr + mii_address);
+
+ if (readl_poll_timeout(priv->ioaddr + mii_address, v, !(v & MII_BUSY),
+ 100, 10000))
+ return -EIO;
+
+ /* Read the data from the MII data register */
+ data = (int)(readl(priv->ioaddr + mii_data) & 0xffff);
+
+ return data;
+}
+
+/**
+ * stmmac_c45_write
+ * @bus: points to the mii_bus structure
+ * @phyaddr: clause-45 phy address
+ * @devad: clause-45 device address
+ * @prtad: clause-45 register address
+ * @phydata: phy data
+ * Description: it writes the data into the MII register follow clause 45.
+ */
+static int stmmac_c45_write(struct mii_bus *bus, int phyaddr, int devad,
+ int prtad, u16 phydata)
+{
+ struct net_device *ndev = bus->priv;
+ struct stmmac_priv *priv = netdev_priv(ndev);
+ unsigned int mii_address = priv->hw->mii.addr;
+ unsigned int mii_data = priv->hw->mii.data;
+ u32 v, value;
+
+ /* Wait until any existing MII operation is complete */
+ if (readl_poll_timeout(priv->ioaddr + mii_address, v, !(v & MII_BUSY),
+ 100, 10000))
+ return -EIO;
+
+ value = phydata;
+ value |= (prtad << priv->hw->mii.cl45_reg_shift) &
+ priv->hw->mii.cl45_reg_mask;
+ writel(value, priv->ioaddr + mii_data);
+
+ mdelay(2);
+
+ value = MII_BUSY;
+ value |= (phyaddr << priv->hw->mii.addr_shift) &
+ priv->hw->mii.addr_mask;
+ value |= (devad << priv->hw->mii.reg_shift) & priv->hw->mii.reg_mask;
+ value |= (priv->clk_csr << priv->hw->mii.clk_csr_shift) &
+ priv->hw->mii.clk_csr_mask;
+
+ if (priv->plat->has_gmac4) {
+ value |= MII_GMAC4_WRITE;
+ value |= priv->hw->mii.cl45_en;
+ }
+ writel(value, priv->ioaddr + mii_address);
+
+ /* Wait until any existing MII operation is complete */
+ return readl_poll_timeout(priv->ioaddr + mii_address, v, !(v & MII_BUSY),
+ 100, 10000);
+}
+
+/**
+ * stmmac_mdio_read
+ * @bus: points to the mii_bus structure
+ * @phyaddr: MII addr
+ * @phyreg: MII reg
+ * Description: it reads data from the MII register from within the phy device.
+ */
+static int stmmac_mdio_read(struct mii_bus *bus, int phyaddr, int phyreg)
+{
+ if (phyreg & MII_ADDR_C45) {
+ int devad, prtad;
+
+ devad = (phyreg >> 16) & 0x1f;
+ prtad = phyreg & 0xffff;
+ return stmmac_c45_read(bus, phyaddr, devad, prtad);
+ } else {
+ return stmmac_c22_read(bus, phyaddr, phyreg);
+ }
+}
+
+/**
+ * stmmac_mdio_write
+ * @bus: points to the mii_bus structure
+ * @phyaddr: MII addr
+ * @phyreg: MII reg
+ * @phydata: phy data
+ * Description: it writes the data into the MII register from within the device.
+ */
+static int stmmac_mdio_write(struct mii_bus *bus, int phyaddr, int phyreg,
+ u16 phydata)
+{
+ if (phyreg & MII_ADDR_C45) {
+ int devad, prtad;
+
+ devad = (phyreg >> 16) & 0x1f;
+ prtad = phyreg & 0xffff;
+ return stmmac_c45_write(bus, phyaddr, devad, prtad, phydata);
+ } else {
+ return stmmac_c22_write(bus, phyaddr, phyreg, phydata);
+ }
+}
+
+/**
* stmmac_mdio_reset
* @bus: points to the mii_bus structure
* Description: reset the MII bus
--
1.7.9.5