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>

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_phy.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_phy.c
index 597d0b1..0856d0b 100644 (file)
--- 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
  *

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_phy.h b/drivers/net/ethernet/intel/ixgbe/ixgbe_phy.h
index e45988c..4c06484 100644 (file)
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_phy.h
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_phy.h
@@ -154,8 +154,12 @@ s32 ixgbe_get_sfp_init_sequence_offsets(struct ixgbe_hw *hw,
 s32 ixgbe_tn_check_overtemp(struct ixgbe_hw *hw);
 s32 ixgbe_read_i2c_byte_generic(struct ixgbe_hw *hw, u8 byte_offset,
                                u8 dev_addr, u8 *data);
+s32 ixgbe_read_i2c_byte_generic_unlocked(struct ixgbe_hw *hw, u8 byte_offset,
+                                        u8 dev_addr, u8 *data);
 s32 ixgbe_write_i2c_byte_generic(struct ixgbe_hw *hw, u8 byte_offset,
                                 u8 dev_addr, u8 data);
+s32 ixgbe_write_i2c_byte_generic_unlocked(struct ixgbe_hw *hw, u8 byte_offset,
+                                         u8 dev_addr, u8 data);
 s32 ixgbe_read_i2c_eeprom_generic(struct ixgbe_hw *hw, u8 byte_offset,
                                  u8 *eeprom_data);
 s32 ixgbe_read_i2c_sff8472_generic(struct ixgbe_hw *hw, u8 byte_offset,
@@ -164,6 +168,10 @@ s32 ixgbe_write_i2c_eeprom_generic(struct ixgbe_hw *hw, u8 byte_offset,
                                   u8 eeprom_data);
 s32 ixgbe_read_i2c_combined_generic(struct ixgbe_hw *hw, u8 addr,
                                    u16 reg, u16 *val);
+s32 ixgbe_read_i2c_combined_generic_unlocked(struct ixgbe_hw *hw, u8 addr,
+                                            u16 reg, u16 *val);
 s32 ixgbe_write_i2c_combined_generic(struct ixgbe_hw *hw, u8 addr,
                                     u16 reg, u16 val);
+s32 ixgbe_write_i2c_combined_generic_unlocked(struct ixgbe_hw *hw, u8 addr,
+                                             u16 reg, u16 val);
 #endif /* _IXGBE_PHY_H_ */

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h b/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h
index 4e16d14..3be743b 100644 (file)
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h
@@ -3329,6 +3329,10 @@ struct ixgbe_phy_operations {
        s32 (*set_phy_power)(struct ixgbe_hw *, bool on);
        s32 (*enter_lplu)(struct ixgbe_hw *);
        s32 (*handle_lasi)(struct ixgbe_hw *hw);
+       s32 (*read_i2c_combined_unlocked)(struct ixgbe_hw *, u8 addr, u16 reg,
+                                         u16 *value);
+       s32 (*write_i2c_combined_unlocked)(struct ixgbe_hw *, u8 addr, u16 reg,
+                                          u16 value);
 };
 
 struct ixgbe_eeprom_info {

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_x550.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_x550.c
index 2906f08..2a1dca6 100644 (file)
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_x550.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_x550.c
@@ -2047,6 +2047,9 @@ static struct ixgbe_phy_operations phy_ops_X550EM_x = {
        .identify               = &ixgbe_identify_phy_x550em,
        .read_i2c_combined      = &ixgbe_read_i2c_combined_generic,
        .write_i2c_combined     = &ixgbe_write_i2c_combined_generic,
+       .read_i2c_combined_unlocked = &ixgbe_read_i2c_combined_generic_unlocked,
+       .write_i2c_combined_unlocked =
+                                    &ixgbe_write_i2c_combined_generic_unlocked,
 };
 
 static const u32 ixgbe_mvals_X550[IXGBE_MVALS_IDX_LIMIT] = {