phy/micrel: Implement support for KSZ8021

The KSZ8021 PHY was previously caught by KS8051, which is not correct.
This PHY needs additional setup if it is strapped for address 0. In such
case an reserved bit must be written in the 0x16, "Operation Mode Strap
Override" register. According to the KS8051 datasheet, that bit means
"PHY Address 0 in non-broadcast" and it indeed behaves as such on KSZ8021.
The issue where the ethernet controller (Freescale FEC) did not communicate
with network is fixed by writing this bit as 1.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: David J. Choi <david.choi@micrel.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/phy/micrel.c b/drivers/net/phy/micrel.c
index cf287e0..e8e00dc 100644 (file)
--- a/drivers/net/phy/micrel.c
+++ b/drivers/net/phy/micrel.c
@@ -21,6 +21,12 @@
 #include <linux/phy.h>
 #include <linux/micrel_phy.h>
 
+/* Operation Mode Strap Override */
+#define MII_KSZPHY_OMSO                                0x16
+#define KSZPHY_OMSO_B_CAST_OFF                 (1 << 9)
+#define KSZPHY_OMSO_RMII_OVERRIDE              (1 << 1)
+#define KSZPHY_OMSO_MII_OVERRIDE               (1 << 0)
+
 /* general Interrupt control/status reg in vendor specific block. */
 #define MII_KSZPHY_INTCS                       0x1B
 #define        KSZPHY_INTCS_JABBER                     (1 << 15)
@@ -101,6 +107,13 @@ static int kszphy_config_init(struct phy_device *phydev)
        return 0;
 }
 
+static int ksz8021_config_init(struct phy_device *phydev)
+{
+       const u16 val = KSZPHY_OMSO_B_CAST_OFF | KSZPHY_OMSO_RMII_OVERRIDE;
+       phy_write(phydev, MII_KSZPHY_OMSO, val);
+       return 0;
+}
+
 static int ks8051_config_init(struct phy_device *phydev)
 {
        int regval;
@@ -127,6 +140,19 @@ static struct phy_driver ksphy_driver[] = {
        .ack_interrupt  = kszphy_ack_interrupt,
        .config_intr    = ks8737_config_intr,
        .driver         = { .owner = THIS_MODULE,},
+}, {
+       .phy_id         = PHY_ID_KSZ8021,
+       .phy_id_mask    = 0x00ffffff,
+       .name           = "Micrel KSZ8021",
+       .features       = (PHY_BASIC_FEATURES | SUPPORTED_Pause |
+                          SUPPORTED_Asym_Pause),
+       .flags          = PHY_HAS_MAGICANEG | PHY_HAS_INTERRUPT,
+       .config_init    = ksz8021_config_init,
+       .config_aneg    = genphy_config_aneg,
+       .read_status    = genphy_read_status,
+       .ack_interrupt  = kszphy_ack_interrupt,
+       .config_intr    = kszphy_config_intr,
+       .driver         = { .owner = THIS_MODULE,},
 }, {
        .phy_id         = PHY_ID_KS8041,
        .phy_id_mask    = 0x00fffff0,
@@ -203,6 +229,7 @@ static struct mdio_device_id __maybe_unused micrel_tbl[] = {
        { PHY_ID_KSZ9021, 0x000ffffe },
        { PHY_ID_KS8001, 0x00ffffff },
        { PHY_ID_KS8737, 0x00fffff0 },
+       { PHY_ID_KSZ8021, 0x00ffffff },
        { PHY_ID_KS8041, 0x00fffff0 },
        { PHY_ID_KS8051, 0x00fffff0 },
        { }

diff --git a/include/linux/micrel_phy.h b/include/linux/micrel_phy.h
index 61f0905..be7f366 100644 (file)
--- a/include/linux/micrel_phy.h
+++ b/include/linux/micrel_phy.h
@@ -5,6 +5,7 @@
 
 #define PHY_ID_KSZ9021         0x00221610
 #define PHY_ID_KS8737          0x00221720
+#define PHY_ID_KSZ8021         0x00221555
 #define PHY_ID_KS8041          0x00221510
 #define PHY_ID_KS8051          0x00221550
 /* both for ks8001 Rev. A/B, and for ks8721 Rev 3. */