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ixgbe/base: i2c combined read/write

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Signed-off-by: Changchun Ouyang <changchun.ouyang@intel.com>
This commit is contained in:
Ouyang Changchun 2014-10-07 10:11:12 +02:00 committed by Thomas Monjalon
parent ea344b73c8
commit 9fe892eb08
2 changed files with 186 additions and 0 deletions
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184
lib/librte_pmd_ixgbe/ixgbe/ixgbe_phy.c
View File

@ -50,6 +50,188 @@ STATIC bool ixgbe_get_i2c_data(u32 *i2cctl);
STATIC s32 ixgbe_read_i2c_sff8472_generic(struct ixgbe_hw *hw, u8 byte_offset,
u8 *sff8472_data);
/**
* 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.
*/
STATIC 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)
DEBUGOUT("I2C byte read combined error - Retrying.\n");
else
DEBUGOUT("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.
*/
STATIC 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)
DEBUGOUT("I2C byte write combined error - Retrying.\n");
else
DEBUGOUT("I2C byte write combined error.\n");
} while (retry < max_retry);
return IXGBE_ERR_I2C;
}
/**
* ixgbe_init_phy_ops_generic - Inits PHY function ptrs
* @hw: pointer to the hardware structure
@ -81,6 +263,8 @@ s32 ixgbe_init_phy_ops_generic(struct ixgbe_hw *hw)
phy->ops.i2c_bus_clear = &ixgbe_i2c_bus_clear;
phy->ops.identify_sfp = &ixgbe_identify_module_generic;
phy->sfp_type = ixgbe_sfp_type_unknown;
phy->ops.read_i2c_combined = &ixgbe_read_i2c_combined_generic;
phy->ops.write_i2c_combined = &ixgbe_write_i2c_combined_generic;
phy->ops.check_overtemp = &ixgbe_tn_check_overtemp;
return IXGBE_SUCCESS;
}

2
lib/librte_pmd_ixgbe/ixgbe/ixgbe_type.h
View File

@ -3286,6 +3286,8 @@ struct ixgbe_phy_operations {
s32 (*read_i2c_eeprom)(struct ixgbe_hw *, u8 , u8 *);
s32 (*write_i2c_eeprom)(struct ixgbe_hw *, u8, u8);
void (*i2c_bus_clear)(struct ixgbe_hw *);
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 *);
};