ixgbe: Provide unlocked I2C methods

Most I2C accesses take and release semaphores for each access. Now
there is a reason to perform multiple I2C operations under the same
holding of the semaphore, so provide unlocked I2C methods for that
purpose.

Signed-off-by: Mark Rustad <mark.d.rustad@intel.com>
Tested-by: Phil Schmitt <phillip.j.schmitt@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

1 files changed, 171 insertions, 28 deletions

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_phy.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_phy.c
index 597d0b1c2370..0856d0bf821e 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_phy.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_phy.c
@@ -100,16 +100,17 @@ static u8 ixgbe_ones_comp_byte_add(u8 add1, u8 add2)
 }
 
 /**
- *  ixgbe_read_i2c_combined_generic - Perform I2C read combined operation
+ *  ixgbe_read_i2c_combined_generic_int - Perform I2C read combined operation
  *  @hw: pointer to the hardware structure
  *  @addr: I2C bus address to read from
  *  @reg: I2C device register to read from
  *  @val: pointer to location to receive read value
+ *  @lock: true if to take and release semaphore
  *
  *  Returns an error code on error.
- **/
-s32 ixgbe_read_i2c_combined_generic(struct ixgbe_hw *hw, u8 addr,
-				    u16 reg, u16 *val)
+ */
+static s32 ixgbe_read_i2c_combined_generic_int(struct ixgbe_hw *hw, u8 addr,
+					       u16 reg, u16 *val, bool lock)
 {
 	u32 swfw_mask = hw->phy.phy_semaphore_mask;
 	int max_retry = 10;
@@ -124,7 +125,7 @@ s32 ixgbe_read_i2c_combined_generic(struct ixgbe_hw *hw, u8 addr,
 	csum = ixgbe_ones_comp_byte_add(reg_high, reg & 0xFF);
 	csum = ~csum;
 	do {
-		if (hw->mac.ops.acquire_swfw_sync(hw, swfw_mask))
+		if (lock && hw->mac.ops.acquire_swfw_sync(hw, swfw_mask))
 			return IXGBE_ERR_SWFW_SYNC;
 		ixgbe_i2c_start(hw);
 		/* Device Address and write indication */
@@ -157,13 +158,15 @@ s32 ixgbe_read_i2c_combined_generic(struct ixgbe_hw *hw, u8 addr,
 		if (ixgbe_clock_out_i2c_bit(hw, false))
 			goto fail;
 		ixgbe_i2c_stop(hw);
-		hw->mac.ops.release_swfw_sync(hw, swfw_mask);
+		if (lock)
+			hw->mac.ops.release_swfw_sync(hw, swfw_mask);
 		*val = (high_bits << 8) | low_bits;
 		return 0;
 
 fail:
 		ixgbe_i2c_bus_clear(hw);
-		hw->mac.ops.release_swfw_sync(hw, swfw_mask);
+		if (lock)
+			hw->mac.ops.release_swfw_sync(hw, swfw_mask);
 		retry++;
 		if (retry < max_retry)
 			hw_dbg(hw, "I2C byte read combined error - Retry.\n");
@@ -175,17 +178,49 @@ fail:
 }
 
 /**
- *  ixgbe_write_i2c_combined_generic - Perform I2C write combined operation
+ *  ixgbe_read_i2c_combined_generic - Perform I2C read combined operation
+ *  @hw: pointer to the hardware structure
+ *  @addr: I2C bus address to read from
+ *  @reg: I2C device register to read from
+ *  @val: pointer to location to receive read value
+ *
+ *  Returns an error code on error.
+ */
+s32 ixgbe_read_i2c_combined_generic(struct ixgbe_hw *hw, u8 addr,
+				    u16 reg, u16 *val)
+{
+	return ixgbe_read_i2c_combined_generic_int(hw, addr, reg, val, true);
+}
+
+/**
+ *  ixgbe_read_i2c_combined_generic_unlocked - Unlocked I2C read combined
+ *  @hw: pointer to the hardware structure
+ *  @addr: I2C bus address to read from
+ *  @reg: I2C device register to read from
+ *  @val: pointer to location to receive read value
+ *
+ *  Returns an error code on error.
+ */
+s32 ixgbe_read_i2c_combined_generic_unlocked(struct ixgbe_hw *hw, u8 addr,
+					     u16 reg, u16 *val)
+{
+	return ixgbe_read_i2c_combined_generic_int(hw, addr, reg, val, false);
+}
+
+/**
+ *  ixgbe_write_i2c_combined_generic_int - Perform I2C write combined operation
  *  @hw: pointer to the hardware structure
  *  @addr: I2C bus address to write to
  *  @reg: I2C device register to write to
  *  @val: value to write
+ *  @lock: true if to take and release semaphore
  *
  *  Returns an error code on error.
- **/
-s32 ixgbe_write_i2c_combined_generic(struct ixgbe_hw *hw,
-				     u8 addr, u16 reg, u16 val)
+ */
+static s32 ixgbe_write_i2c_combined_generic_int(struct ixgbe_hw *hw, u8 addr,
+						u16 reg, u16 val, bool lock)
 {
+	u32 swfw_mask = hw->phy.phy_semaphore_mask;
 	int max_retry = 1;
 	int retry = 0;
 	u8 reg_high;
@@ -197,6 +232,8 @@ s32 ixgbe_write_i2c_combined_generic(struct ixgbe_hw *hw,
 	csum = ixgbe_ones_comp_byte_add(csum, val & 0xFF);
 	csum = ~csum;
 	do {
+		if (lock && hw->mac.ops.acquire_swfw_sync(hw, swfw_mask))
+			return IXGBE_ERR_SWFW_SYNC;
 		ixgbe_i2c_start(hw);
 		/* Device Address and write indication */
 		if (ixgbe_out_i2c_byte_ack(hw, addr))
@@ -217,10 +254,14 @@ s32 ixgbe_write_i2c_combined_generic(struct ixgbe_hw *hw,
 		if (ixgbe_out_i2c_byte_ack(hw, csum))
 			goto fail;
 		ixgbe_i2c_stop(hw);
+		if (lock)
+			hw->mac.ops.release_swfw_sync(hw, swfw_mask);
 		return 0;
 
 fail:
 		ixgbe_i2c_bus_clear(hw);
+		if (lock)
+			hw->mac.ops.release_swfw_sync(hw, swfw_mask);
 		retry++;
 		if (retry < max_retry)
 			hw_dbg(hw, "I2C byte write combined error - Retry.\n");
@@ -232,6 +273,36 @@ fail:
 }
 
 /**
+ *  ixgbe_write_i2c_combined_generic - Perform I2C write combined operation
+ *  @hw: pointer to the hardware structure
+ *  @addr: I2C bus address to write to
+ *  @reg: I2C device register to write to
+ *  @val: value to write
+ *
+ *  Returns an error code on error.
+ */
+s32 ixgbe_write_i2c_combined_generic(struct ixgbe_hw *hw,
+				     u8 addr, u16 reg, u16 val)
+{
+	return ixgbe_write_i2c_combined_generic_int(hw, addr, reg, val, true);
+}
+
+/**
+ *  ixgbe_write_i2c_combined_generic_unlocked - Unlocked I2C write combined
+ *  @hw: pointer to the hardware structure
+ *  @addr: I2C bus address to write to
+ *  @reg: I2C device register to write to
+ *  @val: value to write
+ *
+ *  Returns an error code on error.
+ */
+s32 ixgbe_write_i2c_combined_generic_unlocked(struct ixgbe_hw *hw,
+					      u8 addr, u16 reg, u16 val)
+{
+	return ixgbe_write_i2c_combined_generic_int(hw, addr, reg, val, false);
+}
+
+/**
  *  ixgbe_identify_phy_generic - Get physical layer module
  *  @hw: pointer to hardware structure
  *
@@ -1660,26 +1731,28 @@ s32 ixgbe_write_i2c_eeprom_generic(struct ixgbe_hw *hw, u8 byte_offset,
 }
 
 /**
- *  ixgbe_read_i2c_byte_generic - Reads 8 bit word over I2C
+ *  ixgbe_read_i2c_byte_generic_int - Reads 8 bit word over I2C
  *  @hw: pointer to hardware structure
  *  @byte_offset: byte offset to read
  *  @data: value read
+ *  @lock: true if to take and release semaphore
  *
  *  Performs byte read operation to SFP module's EEPROM over I2C interface at
  *  a specified device address.
- **/
-s32 ixgbe_read_i2c_byte_generic(struct ixgbe_hw *hw, u8 byte_offset,
-				u8 dev_addr, u8 *data)
+ */
+static s32 ixgbe_read_i2c_byte_generic_int(struct ixgbe_hw *hw, u8 byte_offset,
+					   u8 dev_addr, u8 *data, bool lock)
 {
 	s32 status;
 	u32 max_retry = 10;
 	u32 retry = 0;
 	u32 swfw_mask = hw->phy.phy_semaphore_mask;
 	bool nack = true;
+
 	*data = 0;
 
 	do {
-		if (hw->mac.ops.acquire_swfw_sync(hw, swfw_mask))
+		if (lock && hw->mac.ops.acquire_swfw_sync(hw, swfw_mask))
 			return IXGBE_ERR_SWFW_SYNC;
 
 		ixgbe_i2c_start(hw);
@@ -1721,12 +1794,16 @@ s32 ixgbe_read_i2c_byte_generic(struct ixgbe_hw *hw, u8 byte_offset,
 			goto fail;
 
 		ixgbe_i2c_stop(hw);
-		break;
+		if (lock)
+			hw->mac.ops.release_swfw_sync(hw, swfw_mask);
+		return 0;
 
 fail:
 		ixgbe_i2c_bus_clear(hw);
-		hw->mac.ops.release_swfw_sync(hw, swfw_mask);
-		msleep(100);
+		if (lock) {
+			hw->mac.ops.release_swfw_sync(hw, swfw_mask);
+			msleep(100);
+		}
 		retry++;
 		if (retry < max_retry)
 			hw_dbg(hw, "I2C byte read error - Retrying.\n");
@@ -1735,29 +1812,60 @@ fail:
 
 	} while (retry < max_retry);
 
-	hw->mac.ops.release_swfw_sync(hw, swfw_mask);
-
 	return status;
 }
 
 /**
- *  ixgbe_write_i2c_byte_generic - Writes 8 bit word over I2C
+ *  ixgbe_read_i2c_byte_generic - Reads 8 bit word over I2C
+ *  @hw: pointer to hardware structure
+ *  @byte_offset: byte offset to read
+ *  @data: value read
+ *
+ *  Performs byte read operation to SFP module's EEPROM over I2C interface at
+ *  a specified device address.
+ */
+s32 ixgbe_read_i2c_byte_generic(struct ixgbe_hw *hw, u8 byte_offset,
+				u8 dev_addr, u8 *data)
+{
+	return ixgbe_read_i2c_byte_generic_int(hw, byte_offset, dev_addr,
+					       data, true);
+}
+
+/**
+ *  ixgbe_read_i2c_byte_generic_unlocked - Reads 8 bit word over I2C
+ *  @hw: pointer to hardware structure
+ *  @byte_offset: byte offset to read
+ *  @data: value read
+ *
+ *  Performs byte read operation to SFP module's EEPROM over I2C interface at
+ *  a specified device address.
+ */
+s32 ixgbe_read_i2c_byte_generic_unlocked(struct ixgbe_hw *hw, u8 byte_offset,
+					 u8 dev_addr, u8 *data)
+{
+	return ixgbe_read_i2c_byte_generic_int(hw, byte_offset, dev_addr,
+					       data, false);
+}
+
+/**
+ *  ixgbe_write_i2c_byte_generic_int - Writes 8 bit word over I2C
  *  @hw: pointer to hardware structure
  *  @byte_offset: byte offset to write
  *  @data: value to write
+ *  @lock: true if to take and release semaphore
  *
  *  Performs byte write operation to SFP module's EEPROM over I2C interface at
  *  a specified device address.
- **/
-s32 ixgbe_write_i2c_byte_generic(struct ixgbe_hw *hw, u8 byte_offset,
-				 u8 dev_addr, u8 data)
+ */
+static s32 ixgbe_write_i2c_byte_generic_int(struct ixgbe_hw *hw, u8 byte_offset,
+					    u8 dev_addr, u8 data, bool lock)
 {
 	s32 status;
 	u32 max_retry = 1;
 	u32 retry = 0;
 	u32 swfw_mask = hw->phy.phy_semaphore_mask;
 
-	if (hw->mac.ops.acquire_swfw_sync(hw, swfw_mask))
+	if (lock && hw->mac.ops.acquire_swfw_sync(hw, swfw_mask))
 		return IXGBE_ERR_SWFW_SYNC;
 
 	do {
@@ -1788,7 +1896,9 @@ s32 ixgbe_write_i2c_byte_generic(struct ixgbe_hw *hw, u8 byte_offset,
 			goto fail;
 
 		ixgbe_i2c_stop(hw);
-		break;
+		if (lock)
+			hw->mac.ops.release_swfw_sync(hw, swfw_mask);
+		return 0;
 
 fail:
 		ixgbe_i2c_bus_clear(hw);
@@ -1799,12 +1909,45 @@ fail:
 			hw_dbg(hw, "I2C byte write error.\n");
 	} while (retry < max_retry);
 
-	hw->mac.ops.release_swfw_sync(hw, swfw_mask);
+	if (lock)
+		hw->mac.ops.release_swfw_sync(hw, swfw_mask);
 
 	return status;
 }
 
 /**
+ *  ixgbe_write_i2c_byte_generic - Writes 8 bit word over I2C
+ *  @hw: pointer to hardware structure
+ *  @byte_offset: byte offset to write
+ *  @data: value to write
+ *
+ *  Performs byte write operation to SFP module's EEPROM over I2C interface at
+ *  a specified device address.
+ */
+s32 ixgbe_write_i2c_byte_generic(struct ixgbe_hw *hw, u8 byte_offset,
+				 u8 dev_addr, u8 data)
+{
+	return ixgbe_write_i2c_byte_generic_int(hw, byte_offset, dev_addr,
+						data, true);
+}
+
+/**
+ *  ixgbe_write_i2c_byte_generic_unlocked - Writes 8 bit word over I2C
+ *  @hw: pointer to hardware structure
+ *  @byte_offset: byte offset to write
+ *  @data: value to write
+ *
+ *  Performs byte write operation to SFP module's EEPROM over I2C interface at
+ *  a specified device address.
+ */
+s32 ixgbe_write_i2c_byte_generic_unlocked(struct ixgbe_hw *hw, u8 byte_offset,
+					  u8 dev_addr, u8 data)
+{
+	return ixgbe_write_i2c_byte_generic_int(hw, byte_offset, dev_addr,
+						data, false);
+}
+
+/**
  *  ixgbe_i2c_start - Sets I2C start condition
  *  @hw: pointer to hardware structure
  *