net: dsa: mv88e6xxx: introduce wait mask routine

The current mv88e6xxx_wait routine is used to wait for a given mask
to be cleared to zero. However in some cases, the driver may have
to wait for a given mask to be of a certain non-zero value.

Thus provide a generic wait mask routine that will be used to implement
the current mv88e6xxx_wait function, and use it to wait for 88E6185
PPU states.
Signed-off-by: Vivien Didelot <vivien.didelot@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/dsa/mv88e6xxx/chip.c

@@ -80,6 +80,29 @@ int mv88e6xxx_write(struct mv88e6xxx_chip *chip, int addr, int reg, u16 val)
 	return 0;
 }
 
+int mv88e6xxx_wait_mask(struct mv88e6xxx_chip *chip, int addr, int reg,
+			u16 mask, u16 val)
+{
+	u16 data;
+	int err;
+	int i;
+
+	/* There's no bus specific operation to wait for a mask */
+	for (i = 0; i < 16; i++) {
+		err = mv88e6xxx_read(chip, addr, reg, &data);
+		if (err)
+			return err;
+
+		if ((data & mask) == val)
+			return 0;
+
+		usleep_range(1000, 2000);
+	}
+
+	dev_err(chip->dev, "Timeout while waiting for switch\n");
+	return -ETIMEDOUT;
+}
+
 struct mii_bus *mv88e6xxx_default_mdio_bus(struct mv88e6xxx_chip *chip)
 {
 	struct mv88e6xxx_mdio_bus *mdio_bus;
@@ -365,24 +388,7 @@ static void mv88e6xxx_irq_poll_free(struct mv88e6xxx_chip *chip)
 
 int mv88e6xxx_wait(struct mv88e6xxx_chip *chip, int addr, int reg, u16 mask)
 {
-	int i;
-
-	for (i = 0; i < 16; i++) {
-		u16 val;
-		int err;
-
-		err = mv88e6xxx_read(chip, addr, reg, &val);
-		if (err)
-			return err;
-
-		if (!(val & mask))
-			return 0;
-
-		usleep_range(1000, 2000);
-	}
-
-	dev_err(chip->dev, "Timeout while waiting for switch\n");
-	return -ETIMEDOUT;
+	return mv88e6xxx_wait_mask(chip, addr, reg, mask, 0x0000);
 }
 
 /* Indirect write to single pointer-data register with an Update bit */

drivers/net/dsa/mv88e6xxx/chip.h

@@ -588,6 +588,8 @@ static inline bool mv88e6xxx_is_invalid_port(struct mv88e6xxx_chip *chip, int po
 
 int mv88e6xxx_read(struct mv88e6xxx_chip *chip, int addr, int reg, u16 *val);
 int mv88e6xxx_write(struct mv88e6xxx_chip *chip, int addr, int reg, u16 val);
+int mv88e6xxx_wait_mask(struct mv88e6xxx_chip *chip, int addr, int reg,
+			u16 mask, u16 val);
 int mv88e6xxx_update(struct mv88e6xxx_chip *chip, int addr, int reg,
 		     u16 update);
 int mv88e6xxx_wait(struct mv88e6xxx_chip *chip, int addr, int reg, u16 mask);

drivers/net/dsa/mv88e6xxx/global1.c

@@ -32,48 +32,27 @@ int mv88e6xxx_g1_wait(struct mv88e6xxx_chip *chip, int reg, u16 mask)
 	return mv88e6xxx_wait(chip, chip->info->global1_addr, reg, mask);
 }
 
+int mv88e6xxx_g1_wait_mask(struct mv88e6xxx_chip *chip, int reg,
+			   u16 mask, u16 val)
+{
+	return mv88e6xxx_wait_mask(chip, chip->info->global1_addr, reg,
+				   mask, val);
+}
+
 /* Offset 0x00: Switch Global Status Register */
 
 static int mv88e6185_g1_wait_ppu_disabled(struct mv88e6xxx_chip *chip)
 {
-	u16 state;
-	int i, err;
-
-	for (i = 0; i < 16; i++) {
-		err = mv88e6xxx_g1_read(chip, MV88E6XXX_G1_STS, &state);
-		if (err)
-			return err;
-
-		/* Check the value of the PPUState bits 15:14 */
-		state &= MV88E6185_G1_STS_PPU_STATE_MASK;
-		if (state == MV88E6185_G1_STS_PPU_STATE_DISABLED)
-			return 0;
-
-		usleep_range(1000, 2000);
-	}
-
-	return -ETIMEDOUT;
+	return mv88e6xxx_g1_wait_mask(chip, MV88E6XXX_G1_STS,
+				      MV88E6185_G1_STS_PPU_STATE_MASK,
+				      MV88E6185_G1_STS_PPU_STATE_DISABLED);
 }
 
 static int mv88e6185_g1_wait_ppu_polling(struct mv88e6xxx_chip *chip)
 {
-	u16 state;
-	int i, err;
-
-	for (i = 0; i < 16; ++i) {
-		err = mv88e6xxx_g1_read(chip, MV88E6XXX_G1_STS, &state);
-		if (err)
-			return err;
-
-		/* Check the value of the PPUState bits 15:14 */
-		state &= MV88E6185_G1_STS_PPU_STATE_MASK;
-		if (state == MV88E6185_G1_STS_PPU_STATE_POLLING)
-			return 0;
-
-		usleep_range(1000, 2000);
-	}
-
-	return -ETIMEDOUT;
+	return mv88e6xxx_g1_wait_mask(chip, MV88E6XXX_G1_STS,
+				      MV88E6185_G1_STS_PPU_STATE_MASK,
+				      MV88E6185_G1_STS_PPU_STATE_POLLING);
 }
 
 static int mv88e6352_g1_wait_ppu_polling(struct mv88e6xxx_chip *chip)

drivers/net/dsa/mv88e6xxx/global1.h

@@ -250,6 +250,8 @@
 int mv88e6xxx_g1_read(struct mv88e6xxx_chip *chip, int reg, u16 *val);
 int mv88e6xxx_g1_write(struct mv88e6xxx_chip *chip, int reg, u16 val);
 int mv88e6xxx_g1_wait(struct mv88e6xxx_chip *chip, int reg, u16 mask);
+int mv88e6xxx_g1_wait_mask(struct mv88e6xxx_chip *chip, int reg,
+			   u16 mask, u16 val);
 
 int mv88e6xxx_g1_set_switch_mac(struct mv88e6xxx_chip *chip, u8 *addr);