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ixgbe: add methods for combined read and write operations
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Some X550 procedures will be using CS4227 PHY and need to
perform combined read and write operations.  This patch
adds those methods.

Signed-off-by: Don Skidmore <donald.c.skidmore@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
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Don Skidmore authored and Jeff Kirsher committed Dec 5, 2014
1 parent 030eaec commit 28abba0
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Showing 3 changed files with 188 additions and 0 deletions.
182 changes: 182 additions & 0 deletions drivers/net/ethernet/intel/ixgbe/ixgbe_phy.c
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Original file line number Diff line number Diff line change
Expand Up @@ -49,6 +49,188 @@ static enum ixgbe_phy_type ixgbe_get_phy_type_from_id(u32 phy_id);
static s32 ixgbe_get_phy_id(struct ixgbe_hw *hw);
static s32 ixgbe_identify_qsfp_module_generic(struct ixgbe_hw *hw);

/**
* ixgbe_out_i2c_byte_ack - Send I2C byte with ack
* @hw: pointer to the hardware structure
* @byte: byte to send
*
* Returns an error code on error.
**/
static s32 ixgbe_out_i2c_byte_ack(struct ixgbe_hw *hw, u8 byte)
{
s32 status;

status = ixgbe_clock_out_i2c_byte(hw, byte);
if (status)
return status;
return ixgbe_get_i2c_ack(hw);
}

/**
* ixgbe_in_i2c_byte_ack - Receive an I2C byte and send ack
* @hw: pointer to the hardware structure
* @byte: pointer to a u8 to receive the byte
*
* Returns an error code on error.
**/
static s32 ixgbe_in_i2c_byte_ack(struct ixgbe_hw *hw, u8 *byte)
{
s32 status;

status = ixgbe_clock_in_i2c_byte(hw, byte);
if (status)
return status;
/* ACK */
return ixgbe_clock_out_i2c_bit(hw, false);
}

/**
* ixgbe_ones_comp_byte_add - Perform one's complement addition
* @add1: addend 1
* @add2: addend 2
*
* Returns one's complement 8-bit sum.
**/
static u8 ixgbe_ones_comp_byte_add(u8 add1, u8 add2)
{
u16 sum = add1 + add2;

sum = (sum & 0xFF) + (sum >> 8);
return sum & 0xFF;
}

/**
* 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)
{
u32 swfw_mask = hw->phy.phy_semaphore_mask;
int max_retry = 10;
int retry = 0;
u8 csum_byte;
u8 high_bits;
u8 low_bits;
u8 reg_high;
u8 csum;

reg_high = ((reg >> 7) & 0xFE) | 1; /* Indicate read combined */
csum = ixgbe_ones_comp_byte_add(reg_high, reg & 0xFF);
csum = ~csum;
do {
if (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))
goto fail;
/* Write bits 14:8 */
if (ixgbe_out_i2c_byte_ack(hw, reg_high))
goto fail;
/* Write bits 7:0 */
if (ixgbe_out_i2c_byte_ack(hw, reg & 0xFF))
goto fail;
/* Write csum */
if (ixgbe_out_i2c_byte_ack(hw, csum))
goto fail;
/* Re-start condition */
ixgbe_i2c_start(hw);
/* Device Address and read indication */
if (ixgbe_out_i2c_byte_ack(hw, addr | 1))
goto fail;
/* Get upper bits */
if (ixgbe_in_i2c_byte_ack(hw, &high_bits))
goto fail;
/* Get low bits */
if (ixgbe_in_i2c_byte_ack(hw, &low_bits))
goto fail;
/* Get csum */
if (ixgbe_clock_in_i2c_byte(hw, &csum_byte))
goto fail;
/* NACK */
if (ixgbe_clock_out_i2c_bit(hw, false))
goto fail;
ixgbe_i2c_stop(hw);
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);
retry++;
if (retry < max_retry)
hw_dbg(hw, "I2C byte read combined error - Retry.\n");
else
hw_dbg(hw, "I2C byte read combined error.\n");
} while (retry < max_retry);

return IXGBE_ERR_I2C;
}

/**
* 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)
{
int max_retry = 1;
int retry = 0;
u8 reg_high;
u8 csum;

reg_high = (reg >> 7) & 0xFE; /* Indicate write combined */
csum = ixgbe_ones_comp_byte_add(reg_high, reg & 0xFF);
csum = ixgbe_ones_comp_byte_add(csum, val >> 8);
csum = ixgbe_ones_comp_byte_add(csum, val & 0xFF);
csum = ~csum;
do {
ixgbe_i2c_start(hw);
/* Device Address and write indication */
if (ixgbe_out_i2c_byte_ack(hw, addr))
goto fail;
/* Write bits 14:8 */
if (ixgbe_out_i2c_byte_ack(hw, reg_high))
goto fail;
/* Write bits 7:0 */
if (ixgbe_out_i2c_byte_ack(hw, reg & 0xFF))
goto fail;
/* Write data 15:8 */
if (ixgbe_out_i2c_byte_ack(hw, val >> 8))
goto fail;
/* Write data 7:0 */
if (ixgbe_out_i2c_byte_ack(hw, val & 0xFF))
goto fail;
/* Write csum */
if (ixgbe_out_i2c_byte_ack(hw, csum))
goto fail;
ixgbe_i2c_stop(hw);
return 0;

fail:
ixgbe_i2c_bus_clear(hw);
retry++;
if (retry < max_retry)
hw_dbg(hw, "I2C byte write combined error - Retry.\n");
else
hw_dbg(hw, "I2C byte write combined error.\n");
} while (retry < max_retry);

return IXGBE_ERR_I2C;
}

/**
* ixgbe_identify_phy_generic - Get physical layer module
* @hw: pointer to hardware structure
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4 changes: 4 additions & 0 deletions drivers/net/ethernet/intel/ixgbe/ixgbe_phy.h
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Original file line number Diff line number Diff line change
Expand Up @@ -157,4 +157,8 @@ s32 ixgbe_read_i2c_sff8472_generic(struct ixgbe_hw *hw, u8 byte_offset,
u8 *sff8472_data);
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_write_i2c_combined_generic(struct ixgbe_hw *hw, u8 addr,
u16 reg, u16 val);
#endif /* _IXGBE_PHY_H_ */
2 changes: 2 additions & 0 deletions drivers/net/ethernet/intel/ixgbe/ixgbe_type.h
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Original file line number Diff line number Diff line change
Expand Up @@ -2960,6 +2960,8 @@ struct ixgbe_phy_operations {
s32 (*read_i2c_sff8472)(struct ixgbe_hw *, u8 , u8 *);
s32 (*read_i2c_eeprom)(struct ixgbe_hw *, u8 , u8 *);
s32 (*write_i2c_eeprom)(struct ixgbe_hw *, u8, u8);
s32 (*read_i2c_combined)(struct ixgbe_hw *, u8 addr, u16 reg, u16 *val);
s32 (*write_i2c_combined)(struct ixgbe_hw *, u8 addr, u16 reg, u16 val);
s32 (*check_overtemp)(struct ixgbe_hw *);
};

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