[PATCH net-next 07/12] net: hns: Separate C22 and C45 transactions

[Michael Walle]

From: Andrew Lunn <andrew@xxxxxxx>

The hns MDIO bus driver can perform both C22 and C45 transfers.
Create separate functions for each and register the C45 versions using
the new API calls where appropriate.

Signed-off-by: Andrew Lunn <andrew@xxxxxxx>
Signed-off-by: Michael Walle <michael@xxxxxxxx>
---
 drivers/net/ethernet/hisilicon/hns_mdio.c | 192 +++++++++++++++++++++---------
 1 file changed, 135 insertions(+), 57 deletions(-)

diff --git a/drivers/net/ethernet/hisilicon/hns_mdio.c b/drivers/net/ethernet/hisilicon/hns_mdio.c
index c2ae1b4f9a5f..9232caaf0bdc 100644
--- a/drivers/net/ethernet/hisilicon/hns_mdio.c
+++ b/drivers/net/ethernet/hisilicon/hns_mdio.c
@@ -206,7 +206,7 @@ static void hns_mdio_cmd_write(struct hns_mdio_device *mdio_dev,
 }
 
 /**
- * hns_mdio_write - access phy register
+ * hns_mdio_write_c22 - access phy register
  * @bus: mdio bus
  * @phy_id: phy id
  * @regnum: register num
@@ -214,21 +214,19 @@ static void hns_mdio_cmd_write(struct hns_mdio_device *mdio_dev,
  *
  * Return 0 on success, negative on failure
  */
-static int hns_mdio_write(struct mii_bus *bus,
-			  int phy_id, int regnum, u16 data)
+static int hns_mdio_write_c22(struct mii_bus *bus,
+			      int phy_id, int regnum, u16 data)
 {
-	int ret;
 	struct hns_mdio_device *mdio_dev = (struct hns_mdio_device *)bus->priv;
-	u8 devad = ((regnum >> 16) & 0x1f);
-	u8 is_c45 = !!(regnum & MII_ADDR_C45);
 	u16 reg = (u16)(regnum & 0xffff);
-	u8 op;
 	u16 cmd_reg_cfg;
+	int ret;
+	u8 op;
 
 	dev_dbg(&bus->dev, "mdio write %s,base is %p\n",
 		bus->id, mdio_dev->vbase);
-	dev_dbg(&bus->dev, "phy id=%d, is_c45=%d, devad=%d, reg=%#x, write data=%d\n",
-		phy_id, is_c45, devad, reg, data);
+	dev_dbg(&bus->dev, "phy id=%d, reg=%#x, write data=%d\n",
+		phy_id, reg, data);
 
 	/* wait for ready */
 	ret = hns_mdio_wait_ready(bus);
@@ -237,58 +235,91 @@ static int hns_mdio_write(struct mii_bus *bus,
 		return ret;
 	}
 
-	if (!is_c45) {
-		cmd_reg_cfg = reg;
-		op = MDIO_C22_WRITE;
-	} else {
-		/* config the cmd-reg to write addr*/
-		MDIO_SET_REG_FIELD(mdio_dev, MDIO_ADDR_REG, MDIO_ADDR_DATA_M,
-				   MDIO_ADDR_DATA_S, reg);
+	cmd_reg_cfg = reg;
+	op = MDIO_C22_WRITE;
 
-		hns_mdio_cmd_write(mdio_dev, is_c45,
-				   MDIO_C45_WRITE_ADDR, phy_id, devad);
+	MDIO_SET_REG_FIELD(mdio_dev, MDIO_WDATA_REG, MDIO_WDATA_DATA_M,
+			   MDIO_WDATA_DATA_S, data);
 
-		/* check for read or write opt is finished */
-		ret = hns_mdio_wait_ready(bus);
-		if (ret) {
-			dev_err(&bus->dev, "MDIO bus is busy\n");
-			return ret;
-		}
+	hns_mdio_cmd_write(mdio_dev, false, op, phy_id, cmd_reg_cfg);
+
+	return 0;
+}
+
+/**
+ * hns_mdio_write_c45 - access phy register
+ * @bus: mdio bus
+ * @phy_id: phy id
+ * @devad: device address to read
+ * @regnum: register num
+ * @data: register value
+ *
+ * Return 0 on success, negative on failure
+ */
+static int hns_mdio_write_c45(struct mii_bus *bus, int phy_id, int devad,
+			      int regnum, u16 data)
+{
+	struct hns_mdio_device *mdio_dev = (struct hns_mdio_device *)bus->priv;
+	u16 reg = (u16)(regnum & 0xffff);
+	u16 cmd_reg_cfg;
+	int ret;
+	u8 op;
+
+	dev_dbg(&bus->dev, "mdio write %s,base is %p\n",
+		bus->id, mdio_dev->vbase);
+	dev_dbg(&bus->dev, "phy id=%d, devad=%d, reg=%#x, write data=%d\n",
+		phy_id, devad, reg, data);
+
+	/* wait for ready */
+	ret = hns_mdio_wait_ready(bus);
+	if (ret) {
+		dev_err(&bus->dev, "MDIO bus is busy\n");
+		return ret;
+	}
+
+	/* config the cmd-reg to write addr*/
+	MDIO_SET_REG_FIELD(mdio_dev, MDIO_ADDR_REG, MDIO_ADDR_DATA_M,
+			   MDIO_ADDR_DATA_S, reg);
 
-		/* config the data needed writing */
-		cmd_reg_cfg = devad;
-		op = MDIO_C45_WRITE_DATA;
+	hns_mdio_cmd_write(mdio_dev, true, MDIO_C45_WRITE_ADDR, phy_id, devad);
+
+	/* check for read or write opt is finished */
+	ret = hns_mdio_wait_ready(bus);
+	if (ret) {
+		dev_err(&bus->dev, "MDIO bus is busy\n");
+		return ret;
 	}
 
+	/* config the data needed writing */
+	cmd_reg_cfg = devad;
+	op = MDIO_C45_WRITE_DATA;
+
 	MDIO_SET_REG_FIELD(mdio_dev, MDIO_WDATA_REG, MDIO_WDATA_DATA_M,
 			   MDIO_WDATA_DATA_S, data);
 
-	hns_mdio_cmd_write(mdio_dev, is_c45, op, phy_id, cmd_reg_cfg);
+	hns_mdio_cmd_write(mdio_dev, true, op, phy_id, cmd_reg_cfg);
 
 	return 0;
 }
 
 /**
- * hns_mdio_read - access phy register
+ * hns_mdio_read_c22 - access phy register
  * @bus: mdio bus
  * @phy_id: phy id
  * @regnum: register num
  *
  * Return phy register value
  */
-static int hns_mdio_read(struct mii_bus *bus, int phy_id, int regnum)
+static int hns_mdio_read_c22(struct mii_bus *bus, int phy_id, int regnum)
 {
-	int ret;
-	u16 reg_val;
-	u8 devad = ((regnum >> 16) & 0x1f);
-	u8 is_c45 = !!(regnum & MII_ADDR_C45);
-	u16 reg = (u16)(regnum & 0xffff);
 	struct hns_mdio_device *mdio_dev = (struct hns_mdio_device *)bus->priv;
+	u16 reg = (u16)(regnum & 0xffff);
+	u16 reg_val;
+	int ret;
 
 	dev_dbg(&bus->dev, "mdio read %s,base is %p\n",
 		bus->id, mdio_dev->vbase);
-	dev_dbg(&bus->dev, "phy id=%d, is_c45=%d, devad=%d, reg=%#x!\n",
-		phy_id, is_c45, devad, reg);
+	dev_dbg(&bus->dev, "phy id=%d, reg=%#x!\n", phy_id, reg);
 
 	/* Step 1: wait for ready */
 	ret = hns_mdio_wait_ready(bus);
@@ -297,29 +328,74 @@ static int hns_mdio_read(struct mii_bus *bus, int phy_id, int regnum)
 		return ret;
 	}
 
-	if (!is_c45) {
-		hns_mdio_cmd_write(mdio_dev, is_c45,
-				   MDIO_C22_READ, phy_id, reg);
-	} else {
-		MDIO_SET_REG_FIELD(mdio_dev, MDIO_ADDR_REG, MDIO_ADDR_DATA_M,
-				   MDIO_ADDR_DATA_S, reg);
+	hns_mdio_cmd_write(mdio_dev, false, MDIO_C22_READ, phy_id, reg);
 
-		/* Step 2; config the cmd-reg to write addr*/
-		hns_mdio_cmd_write(mdio_dev, is_c45,
-				   MDIO_C45_WRITE_ADDR, phy_id, devad);
+	/* Step 2: waiting for MDIO_COMMAND_REG 's mdio_start==0,*/
+	/* check for read or write opt is finished */
+	ret = hns_mdio_wait_ready(bus);
+	if (ret) {
+		dev_err(&bus->dev, "MDIO bus is busy\n");
+		return ret;
+	}
 
-		/* Step 3: check for read or write opt is finished */
-		ret = hns_mdio_wait_ready(bus);
-		if (ret) {
-			dev_err(&bus->dev, "MDIO bus is busy\n");
-			return ret;
-		}
+	reg_val = MDIO_GET_REG_BIT(mdio_dev, MDIO_STA_REG, MDIO_STATE_STA_B);
+	if (reg_val) {
+		dev_err(&bus->dev, " ERROR! MDIO Read failed!\n");
+		return -EBUSY;
+	}
 
-		hns_mdio_cmd_write(mdio_dev, is_c45,
-				   MDIO_C45_READ, phy_id, devad);
+	/* Step 3; get out data*/
+	reg_val = (u16)MDIO_GET_REG_FIELD(mdio_dev, MDIO_RDATA_REG,
+					  MDIO_RDATA_DATA_M, MDIO_RDATA_DATA_S);
+
+	return reg_val;
+}
+
+/**
+ * hns_mdio_read_c45 - access phy register
+ * @bus: mdio bus
+ * @phy_id: phy id
+ * @devad: device address to read
+ * @regnum: register num
+ *
+ * Return phy register value
+ */
+static int hns_mdio_read_c45(struct mii_bus *bus, int phy_id, int devad,
+			     int regnum)
+{
+	struct hns_mdio_device *mdio_dev = (struct hns_mdio_device *)bus->priv;
+	u16 reg = (u16)(regnum & 0xffff);
+	u16 reg_val;
+	int ret;
+
+	dev_dbg(&bus->dev, "mdio read %s,base is %p\n",
+		bus->id, mdio_dev->vbase);
+	dev_dbg(&bus->dev, "phy id=%d, devad=%d, reg=%#x!\n",
+		phy_id, devad, reg);
+
+	/* Step 1: wait for ready */
+	ret = hns_mdio_wait_ready(bus);
+	if (ret) {
+		dev_err(&bus->dev, "MDIO bus is busy\n");
+		return ret;
+	}
+
+	MDIO_SET_REG_FIELD(mdio_dev, MDIO_ADDR_REG, MDIO_ADDR_DATA_M,
+			   MDIO_ADDR_DATA_S, reg);
+
+	/* Step 2; config the cmd-reg to write addr*/
+	hns_mdio_cmd_write(mdio_dev, true, MDIO_C45_WRITE_ADDR, phy_id, devad);
+
+	/* Step 3: check for read or write opt is finished */
+	ret = hns_mdio_wait_ready(bus);
+	if (ret) {
+		dev_err(&bus->dev, "MDIO bus is busy\n");
+		return ret;
 	}
 
-	/* Step 5: waiting for MDIO_COMMAND_REG's mdio_start==0,*/
+	hns_mdio_cmd_write(mdio_dev, true, MDIO_C45_READ, phy_id, devad);
+
+	/* Step 5: waiting for MDIO_COMMAND_REG 's mdio_start==0,*/
 	/* check for read or write opt is finished */
 	ret = hns_mdio_wait_ready(bus);
 	if (ret) {
@@ -438,8 +514,10 @@ static int hns_mdio_probe(struct platform_device *pdev)
 	}
 
 	new_bus->name = MDIO_BUS_NAME;
-	new_bus->read = hns_mdio_read;
-	new_bus->write = hns_mdio_write;
+	new_bus->read = hns_mdio_read_c22;
+	new_bus->write = hns_mdio_write_c22;
+	new_bus->read_c45 = hns_mdio_read_c45;
+	new_bus->write_c45 = hns_mdio_write_c45;
 	new_bus->reset = hns_mdio_reset;
 	new_bus->priv = mdio_dev;
 	new_bus->parent = &pdev->dev;

-- 
2.30.2