3   Copyright (c) 2013-2018, Intel Corporation
48     I40E_GLGEN_I2CPARAMS(_hw->func_caps.mdio_port_num)
50 /* I2C bit-banging functions */
67  *  ixl_i2c_bus_clear - Clears the I2C bus
76 	struct i40e_hw *hw = &pf->hw;  in ixl_i2c_bus_clear()
105  *  ixl_i2c_stop - Sets I2C stop condition
108  *  Sets I2C stop condition (Low -> High on SDA while SCL is High)
113 	struct i40e_hw *hw = &pf->hw;  in ixl_i2c_stop()
118 	/* Stop condition must begin with data low and clock high */  in ixl_i2c_stop()
122 	/* Setup time for stop condition (4us) */  in ixl_i2c_stop()
127 	/* bus free time between stop and start (4.7us)*/  in ixl_i2c_stop()
132  *  ixl_clock_in_i2c_byte - Clocks in one byte via I2C
146 	for (i = 7; i >= 0; i--) {  in ixl_clock_in_i2c_byte()
155  *  ixl_clock_in_i2c_bit - Clocks in one bit via I2C data/clock
164 	struct i40e_hw *hw = &pf->hw;  in ixl_clock_in_i2c_bit()
191  *  ixl_get_i2c_ack - Polls for I2C ACK
199 	struct i40e_hw *hw = &pf->hw;  in ixl_get_i2c_ack()
204 	bool ack = 1;  in ixl_get_i2c_ack()  local
216 	/* Poll for ACK.  Note that ACK in I2C spec is  in ixl_get_i2c_ack()
220 		ack = ixl_get_i2c_data(pf, &i2cctl);  in ixl_get_i2c_ack()
223 		if (!ack)  in ixl_get_i2c_ack()
227 	if (ack) {  in ixl_get_i2c_ack()
228 		ixl_dbg(pf, IXL_DBG_I2C, "I2C ack was not received.\n");  in ixl_get_i2c_ack()
241  *  ixl_clock_out_i2c_bit - Clocks in/out one bit via I2C data/clock
250 	struct i40e_hw *hw = &pf->hw;  in ixl_clock_out_i2c_bit()
276  *  ixl_clock_out_i2c_byte - Clocks out one byte via I2C
285 	struct i40e_hw *hw = &pf->hw;  in ixl_clock_out_i2c_byte()
293 	for (i = 7; i >= 0; i--) {  in ixl_clock_out_i2c_byte()
312  *  ixl_lower_i2c_clk - Lowers the I2C SCL clock
316  *  Lowers the I2C clock line '1'->'0'
321 	struct i40e_hw *hw = &pf->hw;  in ixl_lower_i2c_clk()
334  *  ixl_raise_i2c_clk - Raises the I2C SCL clock
338  *  Raises the I2C clock line '0'->'1'
343 	struct i40e_hw *hw = &pf->hw;  in ixl_raise_i2c_clk()
364  *  ixl_get_i2c_data - Reads the I2C SDA data bit
384  *  ixl_set_i2c_data - Sets the I2C data bit
394 	struct i40e_hw *hw = &pf->hw;  in ixl_set_i2c_data()
408 	/* Data rise/fall (1000ns/300ns) and set-up time (250ns) */  in ixl_set_i2c_data()
415 		ixl_dbg(pf, IXL_DBG_I2C, "Error - I2C data was not set to %X.\n", data);  in ixl_set_i2c_data()
422  *  ixl_i2c_start - Sets I2C start condition
423  *  Sets I2C start condition (High -> Low on SDA while SCL is High)
428 	struct i40e_hw *hw = &pf->hw;  in ixl_i2c_start()
453  *  ixl_read_i2c_byte_bb - Reads 8 bit word over I2C
459 	struct i40e_hw *hw = &pf->hw;  in ixl_read_i2c_byte_bb()
483 			ixl_dbg(pf, IXL_DBG_I2C, "dev_addr i2c ack error\n");  in ixl_read_i2c_byte_bb()
495 			ixl_dbg(pf, IXL_DBG_I2C, "byte_offset i2c ack error\n");  in ixl_read_i2c_byte_bb()
527 			ixl_dbg(pf, IXL_DBG_I2C, "I2C byte read error - Retrying\n");  in ixl_read_i2c_byte_bb()
542  *  ixl_write_i2c_byte_bb - Writes 8 bit word over I2C
548 	struct i40e_hw *hw = &pf->hw;  in ixl_write_i2c_byte_bb()
593 			ixl_dbg(pf, IXL_DBG_I2C, "I2C byte write error - Retrying\n");  in ixl_write_i2c_byte_bb()
608  *  ixl_read_i2c_byte_reg - Reads 8 bit word over I2C using a hardware register
614 	struct i40e_hw *hw = &pf->hw;  in ixl_read_i2c_byte_reg()
622 	wr32(hw, I40E_GLGEN_I2CCMD(hw->func_caps.mdio_port_num), reg);  in ixl_read_i2c_byte_reg()
624 	status = ixl_wait_for_i2c_completion(hw, hw->func_caps.mdio_port_num);  in ixl_read_i2c_byte_reg()
627 	reg = rd32(hw, I40E_GLGEN_I2CCMD(hw->func_caps.mdio_port_num));  in ixl_read_i2c_byte_reg()
638  *  ixl_write_i2c_byte_reg - Writes 8 bit word over I2C using a hardware register
644 	struct i40e_hw *hw = &pf->hw;  in ixl_write_i2c_byte_reg()
652 	reg = rd32(hw, I40E_GLGEN_I2CCMD(hw->func_caps.mdio_port_num));  in ixl_write_i2c_byte_reg()
663 	/* Write command to registers controlling I2C - data and address. */  in ixl_write_i2c_byte_reg()
664 	wr32(hw, I40E_GLGEN_I2CCMD(hw->func_caps.mdio_port_num), reg);  in ixl_write_i2c_byte_reg()
666 	status = ixl_wait_for_i2c_completion(hw, hw->func_caps.mdio_port_num);  in ixl_write_i2c_byte_reg()
687 	} while (timeout-- > 0);  in ixl_wait_for_i2c_completion()
696  *  ixl_read_i2c_byte_aq - Reads 8 bit word over I2C using an AQ command
702 	struct i40e_hw *hw = &pf->hw;  in ixl_read_i2c_byte_aq()
714 		    i40e_stat_str(hw, status), i40e_aq_str(hw, hw->aq.asq_last_status));  in ixl_read_i2c_byte_aq()
722  *  ixl_write_i2c_byte_aq - Writes 8 bit word over I2C using an AQ command
728 	struct i40e_hw *hw = &pf->hw;  in ixl_write_i2c_byte_aq()
739 		    i40e_stat_str(hw, status), i40e_aq_str(hw, hw->aq.asq_last_status));  in ixl_write_i2c_byte_aq()