[PATCH net-next 1/3] net: phy: broadcom: add helper to write/read RDB registers

[Michael Walle <michael@xxxxxxxx>]

RDB regsiters are used on newer Broadcom PHYs. Add helper to read, write
and modify these registers.

Signed-off-by: Michael Walle <michael@xxxxxxxx>
---
 drivers/net/phy/bcm-phy-lib.c | 80 +++++++++++++++++++++++++++++++++++
 drivers/net/phy/bcm-phy-lib.h |  9 ++++
 include/linux/brcmphy.h       |  3 ++
 3 files changed, 92 insertions(+)

diff --git a/drivers/net/phy/bcm-phy-lib.c b/drivers/net/phy/bcm-phy-lib.c
index e77b274a09fd..d5f9a2701989 100644
--- a/drivers/net/phy/bcm-phy-lib.c
+++ b/drivers/net/phy/bcm-phy-lib.c
@@ -155,6 +155,86 @@ int bcm_phy_write_shadow(struct phy_device *phydev, u16 shadow,
 }
 EXPORT_SYMBOL_GPL(bcm_phy_write_shadow);
 
+int __bcm_phy_read_rdb(struct phy_device *phydev, u16 rdb)
+{
+	int val;
+
+	val = __phy_write(phydev, MII_BCM54XX_RDB_ADDR, rdb);
+	if (val < 0)
+		return val;
+
+	return __phy_read(phydev, MII_BCM54XX_RDB_DATA);
+}
+EXPORT_SYMBOL_GPL(__bcm_phy_read_rdb);
+
+int bcm_phy_read_rdb(struct phy_device *phydev, u16 rdb)
+{
+	int ret;
+
+	phy_lock_mdio_bus(phydev);
+	ret = __bcm_phy_read_rdb(phydev, rdb);
+	phy_unlock_mdio_bus(phydev);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(bcm_phy_read_rdb);
+
+int __bcm_phy_write_rdb(struct phy_device *phydev, u16 rdb, u16 val)
+{
+	int ret;
+
+	ret = __phy_write(phydev, MII_BCM54XX_RDB_ADDR, rdb);
+	if (ret < 0)
+		return ret;
+
+	return __phy_write(phydev, MII_BCM54XX_RDB_DATA, val);
+}
+EXPORT_SYMBOL_GPL(__bcm_phy_write_rdb);
+
+int bcm_phy_write_rdb(struct phy_device *phydev, u16 rdb, u16 val)
+{
+	int ret;
+
+	phy_lock_mdio_bus(phydev);
+	ret = __bcm_phy_write_rdb(phydev, rdb, val);
+	phy_unlock_mdio_bus(phydev);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(bcm_phy_write_rdb);
+
+int __bcm_phy_modify_rdb(struct phy_device *phydev, u16 rdb, u16 mask, u16 set)
+{
+	int new, ret;
+
+	ret = __phy_write(phydev, MII_BCM54XX_RDB_ADDR, rdb);
+	if (ret < 0)
+		return ret;
+
+	ret = __phy_read(phydev, MII_BCM54XX_RDB_DATA);
+	if (ret < 0)
+		return ret;
+
+	new = (ret & ~mask) | set;
+	if (new == ret)
+		return 0;
+
+	return __phy_write(phydev, MII_BCM54XX_RDB_DATA, new);
+}
+EXPORT_SYMBOL_GPL(__bcm_phy_modify_rdb);
+
+int bcm_phy_modify_rdb(struct phy_device *phydev, u16 rdb, u16 mask, u16 set)
+{
+	int ret;
+
+	phy_lock_mdio_bus(phydev);
+	ret = __bcm_phy_modify_rdb(phydev, rdb, mask, set);
+	phy_unlock_mdio_bus(phydev);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(bcm_phy_modify_rdb);
+
 int bcm_phy_enable_apd(struct phy_device *phydev, bool dll_pwr_down)
 {
 	int val;
diff --git a/drivers/net/phy/bcm-phy-lib.h b/drivers/net/phy/bcm-phy-lib.h
index 129df819be8c..4d3de91cda6c 100644
--- a/drivers/net/phy/bcm-phy-lib.h
+++ b/drivers/net/phy/bcm-phy-lib.h
@@ -48,6 +48,15 @@ int bcm_phy_write_shadow(struct phy_device *phydev, u16 shadow,
 			 u16 val);
 int bcm_phy_read_shadow(struct phy_device *phydev, u16 shadow);
 
+int __bcm_phy_write_rdb(struct phy_device *phydev, u16 rdb, u16 val);
+int bcm_phy_write_rdb(struct phy_device *phydev, u16 rdb, u16 val);
+int __bcm_phy_read_rdb(struct phy_device *phydev, u16 rdb);
+int bcm_phy_read_rdb(struct phy_device *phydev, u16 rdb);
+int __bcm_phy_modify_rdb(struct phy_device *phydev, u16 rdb, u16 mask,
+			 u16 set);
+int bcm_phy_modify_rdb(struct phy_device *phydev, u16 rdb, u16 mask,
+		       u16 set);
+
 int bcm_phy_ack_intr(struct phy_device *phydev);
 int bcm_phy_config_intr(struct phy_device *phydev);
 
diff --git a/include/linux/brcmphy.h b/include/linux/brcmphy.h
index 6462c5447872..e14f78b3c8a4 100644
--- a/include/linux/brcmphy.h
+++ b/include/linux/brcmphy.h
@@ -114,6 +114,9 @@
 #define MII_BCM54XX_SHD_VAL(x)	((x & 0x1f) << 10)
 #define MII_BCM54XX_SHD_DATA(x)	((x & 0x3ff) << 0)
 
+#define MII_BCM54XX_RDB_ADDR	0x1e
+#define MII_BCM54XX_RDB_DATA	0x1f
+
 /*
  * AUXILIARY CONTROL SHADOW ACCESS REGISTERS.  (PHY REG 0x18)
  */
-- 
2.20.1