[dpdk-dev] [PATCH 08/18] ixgbe: New function to read and write I2C bytes

[Ouyang Changchun]

This patch implement functions to do I2C byte read and write in 
IXGBE base code; it also relocates function of ixgbe_mng_enabled.

Signed-off-by: Changchun Ouyang <changchun.ouyang at intel.com>
---
 lib/librte_pmd_ixgbe/ixgbe/ixgbe_82599.c  | 136 +++++++++++++++++++++++++-----
 lib/librte_pmd_ixgbe/ixgbe/ixgbe_common.c |  27 ++++++
 2 files changed, 144 insertions(+), 19 deletions(-)

diff --git a/lib/librte_pmd_ixgbe/ixgbe/ixgbe_82599.c b/lib/librte_pmd_ixgbe/ixgbe/ixgbe_82599.c
index adf0e52..277cc25 100644
--- a/lib/librte_pmd_ixgbe/ixgbe/ixgbe_82599.c
+++ b/lib/librte_pmd_ixgbe/ixgbe/ixgbe_82599.c
@@ -53,25 +53,10 @@ STATIC s32 ixgbe_read_eeprom_82599(struct ixgbe_hw *hw,
 				   u16 offset, u16 *data);
 STATIC s32 ixgbe_read_eeprom_buffer_82599(struct ixgbe_hw *hw, u16 offset,
 					  u16 words, u16 *data);
-
-bool ixgbe_mng_enabled(struct ixgbe_hw *hw)
-{
-	u32 fwsm, manc, factps;
-
-	fwsm = IXGBE_READ_REG(hw, IXGBE_FWSM);
-	if ((fwsm & IXGBE_FWSM_MODE_MASK) != IXGBE_FWSM_FW_MODE_PT)
-		return false;
-
-	manc = IXGBE_READ_REG(hw, IXGBE_MANC);
-	if (!(manc & IXGBE_MANC_RCV_TCO_EN))
-		return false;
-
-	factps = IXGBE_READ_REG(hw, IXGBE_FACTPS);
-	if (factps & IXGBE_FACTPS_MNGCG)
-		return false;
-
-	return true;
-}
+STATIC s32 ixgbe_read_i2c_byte_82599(struct ixgbe_hw *hw, u8 byte_offset,
+					u8 dev_addr, u8 *data);
+STATIC s32 ixgbe_write_i2c_byte_82599(struct ixgbe_hw *hw, u8 byte_offset,
+					u8 dev_addr, u8 data);
 
 void ixgbe_init_mac_link_ops_82599(struct ixgbe_hw *hw)
 {
@@ -2583,4 +2568,117 @@ reset_pipeline_out:
 }
 
 
+/**
+ *  ixgbe_read_i2c_byte_82599 - 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.
+ **/
+STATIC s32 ixgbe_read_i2c_byte_82599(struct ixgbe_hw *hw, u8 byte_offset,
+				u8 dev_addr, u8 *data)
+{
+	u32 esdp;
+	s32 status;
+	s32 timeout = 200;
+
+	DEBUGFUNC("ixgbe_read_i2c_byte_82599");
+
+	if (hw->phy.qsfp_shared_i2c_bus == TRUE) {
+		/* Acquire I2C bus ownership. */
+		esdp = IXGBE_READ_REG(hw, IXGBE_ESDP);
+		esdp |= IXGBE_ESDP_SDP0;
+		IXGBE_WRITE_REG(hw, IXGBE_ESDP, esdp);
+		IXGBE_WRITE_FLUSH(hw);
+
+		while (timeout) {
+			esdp = IXGBE_READ_REG(hw, IXGBE_ESDP);
+			if (esdp & IXGBE_ESDP_SDP1)
+				break;
+
+			msec_delay(5);
+			timeout--;
+		}
+
+		if (!timeout) {
+			DEBUGOUT("Driver can't access resource,"
+				 " acquiring I2C bus timeout.\n");
+			status = IXGBE_ERR_I2C;
+			goto release_i2c_access;
+		}
+	}
+
+	status = ixgbe_read_i2c_byte_generic(hw, byte_offset, dev_addr, data);
+
+release_i2c_access:
+
+	if (hw->phy.qsfp_shared_i2c_bus == TRUE) {
+		/* Release I2C bus ownership. */
+		esdp = IXGBE_READ_REG(hw, IXGBE_ESDP);
+		esdp &= ~IXGBE_ESDP_SDP0;
+		IXGBE_WRITE_REG(hw, IXGBE_ESDP, esdp);
+		IXGBE_WRITE_FLUSH(hw);
+	}
+
+	return status;
+}
+
+/**
+ *  ixgbe_write_i2c_byte_82599 - 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.
+ **/
+STATIC s32 ixgbe_write_i2c_byte_82599(struct ixgbe_hw *hw, u8 byte_offset,
+				 u8 dev_addr, u8 data)
+{
+	u32 esdp;
+	s32 status;
+	s32 timeout = 200;
+
+	DEBUGFUNC("ixgbe_write_i2c_byte_82599");
+
+	if (hw->phy.qsfp_shared_i2c_bus == TRUE) {
+		/* Acquire I2C bus ownership. */
+		esdp = IXGBE_READ_REG(hw, IXGBE_ESDP);
+		esdp |= IXGBE_ESDP_SDP0;
+		IXGBE_WRITE_REG(hw, IXGBE_ESDP, esdp);
+		IXGBE_WRITE_FLUSH(hw);
+
+		while (timeout) {
+			esdp = IXGBE_READ_REG(hw, IXGBE_ESDP);
+			if (esdp & IXGBE_ESDP_SDP1)
+				break;
+
+			msec_delay(5);
+			timeout--;
+		}
+
+		if (!timeout) {
+			DEBUGOUT("Driver can't access resource,"
+				 " acquiring I2C bus timeout.\n");
+			status = IXGBE_ERR_I2C;
+			goto release_i2c_access;
+		}
+	}
+
+	status = ixgbe_write_i2c_byte_generic(hw, byte_offset, dev_addr, data);
+
+release_i2c_access:
+
+	if (hw->phy.qsfp_shared_i2c_bus == TRUE) {
+		/* Release I2C bus ownership. */
+		esdp = IXGBE_READ_REG(hw, IXGBE_ESDP);
+		esdp &= ~IXGBE_ESDP_SDP0;
+		IXGBE_WRITE_REG(hw, IXGBE_ESDP, esdp);
+		IXGBE_WRITE_FLUSH(hw);
+	}
+
+	return status;
+}
 
diff --git a/lib/librte_pmd_ixgbe/ixgbe/ixgbe_common.c b/lib/librte_pmd_ixgbe/ixgbe/ixgbe_common.c
index 749188d..850c12d 100644
--- a/lib/librte_pmd_ixgbe/ixgbe/ixgbe_common.c
+++ b/lib/librte_pmd_ixgbe/ixgbe/ixgbe_common.c
@@ -4663,3 +4663,30 @@ void ixgbe_enable_rx_generic(struct ixgbe_hw *hw)
 		}
 	}
 }
+
+/**
+ * ixgbe_mng_enabled - Is the manageability engine enabled?
+ * @hw: pointer to hardware structure
+ *
+ * Returns true if the manageability engine is enabled.
+ **/
+bool ixgbe_mng_enabled(struct ixgbe_hw *hw)
+{
+	u32 fwsm, manc, factps;
+
+	fwsm = IXGBE_READ_REG(hw, IXGBE_FWSM);
+	if ((fwsm & IXGBE_FWSM_MODE_MASK) != IXGBE_FWSM_FW_MODE_PT)
+		return false;
+
+	manc = IXGBE_READ_REG(hw, IXGBE_MANC);
+	if (!(manc & IXGBE_MANC_RCV_TCO_EN))
+		return false;
+
+	if (hw->mac.type <= ixgbe_mac_X540) {
+		factps = IXGBE_READ_REG(hw, IXGBE_FACTPS);
+		if (factps & IXGBE_FACTPS_MNGCG)
+			return false;
+	}
+
+	return true;
+}
-- 
1.8.4.2