driver: net: fm: add DM MDIO support

Allow the MDIO devices to be probed based on the device tree.

Signed-off-by: Madalin Bucur <madalin.bucur@oss.nxp.com>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>

diff --git a/drivers/net/fm/memac_phy.c b/drivers/net/fm/memac_phy.c
index c2ef1b4e737ecd8dc9112ce7596b922e51a55ea7..4cbfbc70ab530c231d80a564fc3b22abec642560 100644 (file)
--- a/drivers/net/fm/memac_phy.c
+++ b/drivers/net/fm/memac_phy.c
@@ -22,6 +22,12 @@
 #define memac_setbits_32(a, v) setbits_be32(a, v)
 #endif
 
+#ifdef CONFIG_DM_ETH
+struct fm_mdio_priv {
+       struct memac_mdio_controller *regs;
+};
+#endif
+
 static u32 memac_in_32(u32 *reg)
 {
 #ifdef CONFIG_SYS_MEMAC_LITTLE_ENDIAN
@@ -39,10 +45,23 @@ static u32 memac_in_32(u32 *reg)
 int memac_mdio_write(struct mii_dev *bus, int port_addr, int dev_addr,
                        int regnum, u16 value)
 {
+       struct memac_mdio_controller *regs;
        u32 mdio_ctl;
-       struct memac_mdio_controller *regs = bus->priv;
        u32 c45 = 1; /* Default to 10G interface */
 
+#ifndef CONFIG_DM_ETH
+       regs = bus->priv;
+#else
+       struct fm_mdio_priv *priv;
+
+       if (!bus->priv)
+               return -EINVAL;
+       priv = dev_get_priv(bus->priv);
+       regs = priv->regs;
+       debug("memac_mdio_write(regs %p, port %d, dev %d, reg %d, val %#x)\n",
+             regs, port_addr, dev_addr, regnum, value);
+#endif
+
        if (dev_addr == MDIO_DEVAD_NONE) {
                c45 = 0; /* clause 22 */
                dev_addr = regnum & 0x1f;
@@ -84,13 +103,26 @@ int memac_mdio_write(struct mii_dev *bus, int port_addr, int dev_addr,
 int memac_mdio_read(struct mii_dev *bus, int port_addr, int dev_addr,
                        int regnum)
 {
+       struct memac_mdio_controller *regs;
        u32 mdio_ctl;
-       struct memac_mdio_controller *regs = bus->priv;
        u32 c45 = 1;
 
+#ifndef CONFIG_DM_ETH
+       regs = bus->priv;
+#else
+       struct fm_mdio_priv *priv;
+
+       if (!bus->priv)
+               return -EINVAL;
+       priv = dev_get_priv(bus->priv);
+       regs = priv->regs;
+#endif
+
        if (dev_addr == MDIO_DEVAD_NONE) {
+#ifndef CONFIG_DM_ETH
                if (!strcmp(bus->name, DEFAULT_FM_TGEC_MDIO_NAME))
                        return 0xffff;
+#endif
                c45 = 0; /* clause 22 */
                dev_addr = regnum & 0x1f;
                memac_clrbits_32(&regs->mdio_stat, MDIO_STAT_ENC);
@@ -133,6 +165,7 @@ int memac_mdio_reset(struct mii_dev *bus)
        return 0;
 }
 
+#ifndef CONFIG_DM_ETH
 int fm_memac_mdio_init(bd_t *bis, struct memac_mdio_info *info)
 {
        struct mii_dev *bus = mdio_alloc();
@@ -167,3 +200,105 @@ int fm_memac_mdio_init(bd_t *bis, struct memac_mdio_info *info)
 
        return mdio_register(bus);
 }
+
+#else /* CONFIG_DM_ETH */
+#if defined(CONFIG_PHYLIB) && defined(CONFIG_DM_MDIO)
+static int fm_mdio_read(struct udevice *dev, int addr, int devad, int reg)
+{
+       struct mdio_perdev_priv *pdata = (dev) ? dev_get_uclass_priv(dev) :
+                                                NULL;
+
+       if (pdata && pdata->mii_bus)
+               return memac_mdio_read(pdata->mii_bus, addr, devad, reg);
+
+       return -1;
+}
+
+static int fm_mdio_write(struct udevice *dev, int addr, int devad, int reg,
+                        u16 val)
+{
+       struct mdio_perdev_priv *pdata = (dev) ? dev_get_uclass_priv(dev) :
+                                                NULL;
+
+       if (pdata && pdata->mii_bus)
+               return memac_mdio_write(pdata->mii_bus, addr, devad, reg, val);
+
+       return -1;
+}
+
+static int fm_mdio_reset(struct udevice *dev)
+{
+       struct mdio_perdev_priv *pdata = (dev) ? dev_get_uclass_priv(dev) :
+                                                NULL;
+
+       if (pdata && pdata->mii_bus)
+               return memac_mdio_reset(pdata->mii_bus);
+
+       return -1;
+}
+
+static const struct mdio_ops fm_mdio_ops = {
+       .read = fm_mdio_read,
+       .write = fm_mdio_write,
+       .reset = fm_mdio_reset,
+};
+
+static const struct udevice_id fm_mdio_ids[] = {
+       { .compatible = "fsl,fman-memac-mdio" },
+       {}
+};
+
+static int fm_mdio_probe(struct udevice *dev)
+{
+       struct fm_mdio_priv *priv = (dev) ? dev_get_priv(dev) : NULL;
+       struct mdio_perdev_priv *pdata = (dev) ? dev_get_uclass_priv(dev) :
+                                                NULL;
+
+       if (!dev) {
+               printf("%s dev = NULL\n", __func__);
+               return -1;
+       }
+       if (!priv) {
+               printf("dev_get_priv(dev %p) = NULL\n", dev);
+               return -1;
+       }
+       priv->regs = (void *)(uintptr_t)dev_read_addr(dev);
+       debug("%s priv %p @ regs %p, pdata %p\n", __func__,
+             priv, priv->regs, pdata);
+
+       /*
+        * On some platforms like B4860, default value of MDIO_CLK_DIV bits
+        * in mdio_stat(mdio_cfg) register generates MDIO clock too high
+        * (much higher than 2.5MHz), violating the IEEE specs.
+        * On other platforms like T1040, default value of MDIO_CLK_DIV bits
+        * is zero, so MDIO clock is disabled.
+        * So, for proper functioning of MDIO, MDIO_CLK_DIV bits needs to
+        * be properly initialized.
+        * The default NEG bit should be '1' as per FMANv3 RM, but on platforms
+        * like T2080QDS, this bit default is '0', which leads to MDIO failure
+        * on XAUI PHY, so set this bit definitely.
+        */
+       if (priv && priv->regs && priv->regs->mdio_stat)
+               memac_setbits_32(&priv->regs->mdio_stat,
+                                MDIO_STAT_CLKDIV(258) | MDIO_STAT_NEG);
+
+       return 0;
+}
+
+static int fm_mdio_remove(struct udevice *dev)
+{
+       return 0;
+}
+
+U_BOOT_DRIVER(fman_mdio) = {
+       .name = "fman_mdio",
+       .id = UCLASS_MDIO,
+       .of_match = fm_mdio_ids,
+       .probe = fm_mdio_probe,
+       .remove = fm_mdio_remove,
+       .ops = &fm_mdio_ops,
+       .priv_auto_alloc_size = sizeof(struct fm_mdio_priv),
+       .platdata_auto_alloc_size = sizeof(struct mdio_perdev_priv),
+};
+#endif /* CONFIG_PHYLIB && CONFIG_DM_MDIO */
+#endif /* CONFIG_DM_ETH */