[dpdk-dev] [PATCH 31/36] ixgbe base codes: Bit-bang mode

[Ouyang Changchun <changchun.ouyang@intel.com>]

Support the bit-bang mode on X550;
And negate I2C output enable;

Signed-off-by: Changchun Ouyang <changchun.ouyang@intel.com>
---
 lib/librte_pmd_ixgbe/ixgbe/ixgbe_phy.c  | 66 +++++++++++++++++++++++++++++++--
 lib/librte_pmd_ixgbe/ixgbe/ixgbe_type.h |  6 +++
 2 files changed, 68 insertions(+), 4 deletions(-)

diff --git a/lib/librte_pmd_ixgbe/ixgbe/ixgbe_phy.c b/lib/librte_pmd_ixgbe/ixgbe/ixgbe_phy.c
index dc58f66..4a3463a 100644
--- a/lib/librte_pmd_ixgbe/ixgbe/ixgbe_phy.c
+++ b/lib/librte_pmd_ixgbe/ixgbe/ixgbe_phy.c
@@ -2103,6 +2103,7 @@ write_byte_out:
  *  @hw: pointer to hardware structure
  *
  *  Sets I2C start condition (High -> Low on SDA while SCL is High)
+ *  Set bit-bang mode on X550 hardware.
  **/
 STATIC void ixgbe_i2c_start(struct ixgbe_hw *hw)
 {
@@ -2110,6 +2111,8 @@ STATIC void ixgbe_i2c_start(struct ixgbe_hw *hw)
 
 	DEBUGFUNC("ixgbe_i2c_start");
 
+	i2cctl |= IXGBE_I2C_BB_EN_BY_MAC(hw);
+
 	/* Start condition must begin with data and clock high */
 	ixgbe_set_i2c_data(hw, &i2cctl, 1);
 	ixgbe_raise_i2c_clk(hw, &i2cctl);
@@ -2134,10 +2137,15 @@ STATIC void ixgbe_i2c_start(struct ixgbe_hw *hw)
  *  @hw: pointer to hardware structure
  *
  *  Sets I2C stop condition (Low -> High on SDA while SCL is High)
+ *  Disables bit-bang mode and negates data output enable on X550
+ *  hardware.
  **/
 STATIC void ixgbe_i2c_stop(struct ixgbe_hw *hw)
 {
 	u32 i2cctl = IXGBE_READ_REG(hw, IXGBE_I2CCTL_BY_MAC(hw));
+	u32 data_oe_bit = IXGBE_I2C_DATA_OE_N_EN_BY_MAC(hw);
+	u32 clk_oe_bit = IXGBE_I2C_CLK_OE_N_EN_BY_MAC(hw);
+	u32 bb_en_bit = IXGBE_I2C_BB_EN_BY_MAC(hw);
 
 	DEBUGFUNC("ixgbe_i2c_stop");
 
@@ -2152,6 +2160,13 @@ STATIC void ixgbe_i2c_stop(struct ixgbe_hw *hw)
 
 	/* bus free time between stop and start (4.7us)*/
 	usec_delay(IXGBE_I2C_T_BUF);
+
+	if (bb_en_bit || data_oe_bit || clk_oe_bit) {
+		i2cctl &= ~bb_en_bit;
+		i2cctl |= data_oe_bit | clk_oe_bit;
+		IXGBE_WRITE_REG(hw, IXGBE_I2CCTL_BY_MAC(hw), i2cctl);
+		IXGBE_WRITE_FLUSH(hw);
+	}
 }
 
 /**
@@ -2168,6 +2183,7 @@ STATIC s32 ixgbe_clock_in_i2c_byte(struct ixgbe_hw *hw, u8 *data)
 
 	DEBUGFUNC("ixgbe_clock_in_i2c_byte");
 
+	*data = 0;
 	for (i = 7; i >= 0; i--) {
 		ixgbe_clock_in_i2c_bit(hw, &bit);
 		*data |= bit << i;
@@ -2203,6 +2219,7 @@ STATIC s32 ixgbe_clock_out_i2c_byte(struct ixgbe_hw *hw, u8 data)
 	/* Release SDA line (set high) */
 	i2cctl = IXGBE_READ_REG(hw, IXGBE_I2CCTL_BY_MAC(hw));
 	i2cctl |= IXGBE_I2C_DATA_OUT_BY_MAC(hw);
+	i2cctl |= IXGBE_I2C_DATA_OE_N_EN_BY_MAC(hw);
 	IXGBE_WRITE_REG(hw, IXGBE_I2CCTL_BY_MAC(hw), i2cctl);
 	IXGBE_WRITE_FLUSH(hw);
 
@@ -2217,6 +2234,7 @@ STATIC s32 ixgbe_clock_out_i2c_byte(struct ixgbe_hw *hw, u8 data)
  **/
 STATIC s32 ixgbe_get_i2c_ack(struct ixgbe_hw *hw)
 {
+	u32 data_oe_bit = IXGBE_I2C_DATA_OE_N_EN_BY_MAC(hw);
 	s32 status = IXGBE_SUCCESS;
 	u32 i = 0;
 	u32 i2cctl = IXGBE_READ_REG(hw, IXGBE_I2CCTL_BY_MAC(hw));
@@ -2225,9 +2243,14 @@ STATIC s32 ixgbe_get_i2c_ack(struct ixgbe_hw *hw)
 
 	DEBUGFUNC("ixgbe_get_i2c_ack");
 
+	if (data_oe_bit) {
+		i2cctl |= IXGBE_I2C_DATA_OUT_BY_MAC(hw);
+		i2cctl |= data_oe_bit;
+		IXGBE_WRITE_REG(hw, IXGBE_I2CCTL_BY_MAC(hw), i2cctl);
+		IXGBE_WRITE_FLUSH(hw);
+	}
 	ixgbe_raise_i2c_clk(hw, &i2cctl);
 
-
 	/* Minimum high period of clock is 4us */
 	usec_delay(IXGBE_I2C_T_HIGH);
 
@@ -2265,9 +2288,16 @@ STATIC s32 ixgbe_get_i2c_ack(struct ixgbe_hw *hw)
 STATIC s32 ixgbe_clock_in_i2c_bit(struct ixgbe_hw *hw, bool *data)
 {
 	u32 i2cctl = IXGBE_READ_REG(hw, IXGBE_I2CCTL_BY_MAC(hw));
+	u32 data_oe_bit = IXGBE_I2C_DATA_OE_N_EN_BY_MAC(hw);
 
 	DEBUGFUNC("ixgbe_clock_in_i2c_bit");
 
+	if (data_oe_bit) {
+		i2cctl |= IXGBE_I2C_DATA_OUT_BY_MAC(hw);
+		i2cctl |= data_oe_bit;
+		IXGBE_WRITE_REG(hw, IXGBE_I2CCTL_BY_MAC(hw), i2cctl);
+		IXGBE_WRITE_FLUSH(hw);
+	}
 	ixgbe_raise_i2c_clk(hw, &i2cctl);
 
 	/* Minimum high period of clock is 4us */
@@ -2326,15 +2356,22 @@ STATIC s32 ixgbe_clock_out_i2c_bit(struct ixgbe_hw *hw, bool data)
  *  @i2cctl: Current value of I2CCTL register
  *
  *  Raises the I2C clock line '0'->'1'
+ *  Negates the I2C clock output enable on X550 hardware.
  **/
 STATIC void ixgbe_raise_i2c_clk(struct ixgbe_hw *hw, u32 *i2cctl)
 {
+	u32 clk_oe_bit = IXGBE_I2C_CLK_OE_N_EN_BY_MAC(hw);
 	u32 i = 0;
 	u32 timeout = IXGBE_I2C_CLOCK_STRETCHING_TIMEOUT;
 	u32 i2cctl_r = 0;
 
 	DEBUGFUNC("ixgbe_raise_i2c_clk");
 
+	if (clk_oe_bit) {
+		*i2cctl |= clk_oe_bit;
+		IXGBE_WRITE_REG(hw, IXGBE_I2CCTL_BY_MAC(hw), *i2cctl);
+	}
+
 	for (i = 0; i < timeout; i++) {
 		*i2cctl |= IXGBE_I2C_CLK_OUT_BY_MAC(hw);
 
@@ -2355,13 +2392,14 @@ STATIC void ixgbe_raise_i2c_clk(struct ixgbe_hw *hw, u32 *i2cctl)
  *  @i2cctl: Current value of I2CCTL register
  *
  *  Lowers the I2C clock line '1'->'0'
+ *  Asserts the I2C clock output enable on X550 hardware.
  **/
 STATIC void ixgbe_lower_i2c_clk(struct ixgbe_hw *hw, u32 *i2cctl)
 {
-
 	DEBUGFUNC("ixgbe_lower_i2c_clk");
 
 	*i2cctl &= ~(IXGBE_I2C_CLK_OUT_BY_MAC(hw));
+	*i2cctl &= ~IXGBE_I2C_CLK_OE_N_EN_BY_MAC(hw);
 
 	IXGBE_WRITE_REG(hw, IXGBE_I2CCTL_BY_MAC(hw), *i2cctl);
 	IXGBE_WRITE_FLUSH(hw);
@@ -2377,9 +2415,11 @@ STATIC void ixgbe_lower_i2c_clk(struct ixgbe_hw *hw, u32 *i2cctl)
  *  @data: I2C data value (0 or 1) to set
  *
  *  Sets the I2C data bit
+ *  Asserts the I2C data output enable on X550 hardware.
  **/
 STATIC s32 ixgbe_set_i2c_data(struct ixgbe_hw *hw, u32 *i2cctl, bool data)
 {
+	u32 data_oe_bit = IXGBE_I2C_DATA_OE_N_EN_BY_MAC(hw);
 	s32 status = IXGBE_SUCCESS;
 
 	DEBUGFUNC("ixgbe_set_i2c_data");
@@ -2388,6 +2428,7 @@ STATIC s32 ixgbe_set_i2c_data(struct ixgbe_hw *hw, u32 *i2cctl, bool data)
 		*i2cctl |= IXGBE_I2C_DATA_OUT_BY_MAC(hw);
 	else
 		*i2cctl &= ~(IXGBE_I2C_DATA_OUT_BY_MAC(hw));
+	*i2cctl &= ~data_oe_bit;
 
 	IXGBE_WRITE_REG(hw, IXGBE_I2CCTL_BY_MAC(hw), *i2cctl);
 	IXGBE_WRITE_FLUSH(hw);
@@ -2395,6 +2436,14 @@ STATIC s32 ixgbe_set_i2c_data(struct ixgbe_hw *hw, u32 *i2cctl, bool data)
 	/* Data rise/fall (1000ns/300ns) and set-up time (250ns) */
 	usec_delay(IXGBE_I2C_T_RISE + IXGBE_I2C_T_FALL + IXGBE_I2C_T_SU_DATA);
 
+	if (!data)	/* Can't verify data in this case */
+		return IXGBE_SUCCESS;
+	if (data_oe_bit) {
+		*i2cctl |= data_oe_bit;
+		IXGBE_WRITE_REG(hw, IXGBE_I2CCTL_BY_MAC(hw), *i2cctl);
+		IXGBE_WRITE_FLUSH(hw);
+	}
+
 	/* Verify data was set correctly */
 	*i2cctl = IXGBE_READ_REG(hw, IXGBE_I2CCTL_BY_MAC(hw));
 	if (data != ixgbe_get_i2c_data(hw, i2cctl)) {
@@ -2413,14 +2462,22 @@ STATIC s32 ixgbe_set_i2c_data(struct ixgbe_hw *hw, u32 *i2cctl, bool data)
  *  @i2cctl: Current value of I2CCTL register
  *
  *  Returns the I2C data bit value
+ *  Negates the I2C data output enable on X550 hardware.
  **/
 STATIC bool ixgbe_get_i2c_data(struct ixgbe_hw *hw, u32 *i2cctl)
 {
+	u32 data_oe_bit = IXGBE_I2C_DATA_OE_N_EN_BY_MAC(hw);
 	bool data;
-	UNREFERENCED_1PARAMETER(hw);
 
 	DEBUGFUNC("ixgbe_get_i2c_data");
 
+	if (data_oe_bit) {
+		*i2cctl |= data_oe_bit;
+		IXGBE_WRITE_REG(hw, IXGBE_I2CCTL_BY_MAC(hw), *i2cctl);
+		IXGBE_WRITE_FLUSH(hw);
+		usec_delay(IXGBE_I2C_T_FALL);
+	}
+
 	if (*i2cctl & IXGBE_I2C_DATA_IN_BY_MAC(hw))
 		data = 1;
 	else
@@ -2438,12 +2495,13 @@ STATIC bool ixgbe_get_i2c_data(struct ixgbe_hw *hw, u32 *i2cctl)
  **/
 void ixgbe_i2c_bus_clear(struct ixgbe_hw *hw)
 {
-	u32 i2cctl = IXGBE_READ_REG(hw, IXGBE_I2CCTL_BY_MAC(hw));
+	u32 i2cctl;
 	u32 i;
 
 	DEBUGFUNC("ixgbe_i2c_bus_clear");
 
 	ixgbe_i2c_start(hw);
+	i2cctl = IXGBE_READ_REG(hw, IXGBE_I2CCTL_BY_MAC(hw));
 
 	ixgbe_set_i2c_data(hw, &i2cctl, 1);
 
diff --git a/lib/librte_pmd_ixgbe/ixgbe/ixgbe_type.h b/lib/librte_pmd_ixgbe/ixgbe/ixgbe_type.h
index 94f4900..06b507a 100644
--- a/lib/librte_pmd_ixgbe/ixgbe/ixgbe_type.h
+++ b/lib/librte_pmd_ixgbe/ixgbe/ixgbe_type.h
@@ -188,6 +188,12 @@ POSSIBILITY OF SUCH DAMAGE.
 					0x00001000 : 0x00000004)
 #define IXGBE_I2C_DATA_OUT_BY_MAC(_hw)(((_hw)->mac.type) >= ixgbe_mac_X550 ? \
 					0x00000400 : 0x00000008)
+#define IXGBE_I2C_BB_EN_BY_MAC(hw) ((hw)->mac.type >= ixgbe_mac_X550 ? \
+				    0x00000100 : 0)
+#define IXGBE_I2C_DATA_OE_N_EN_BY_MAC(hw) ((hw)->mac.type >= ixgbe_mac_X550 ? \
+					   0x00000800 : 0)
+#define IXGBE_I2C_CLK_OE_N_EN_BY_MAC(hw) ((hw)->mac.type >= ixgbe_mac_X550 ? \
+					  0x00002000 : 0)
 #define IXGBE_I2C_CLOCK_STRETCHING_TIMEOUT	500
 
 #define IXGBE_I2C_THERMAL_SENSOR_ADDR	0xF8
-- 
1.8.4.2