path: root/drivers/net/ethernet/intel/i40e/i40e_ptp.c

// SPDX-License-Identifier: GPL-2.0
/* Copyright(c) 2013 - 2018 Intel Corporation. */

#include "i40e.h"
#include <linux/ptp_classify.h>
#include <linux/posix-clock.h>

/* The XL710 timesync is very much like Intel's 82599 design when it comes to
 * the fundamental clock design. However, the clock operations are much simpler
 * in the XL710 because the device supports a full 64 bits of nanoseconds.
 * Because the field is so wide, we can forgo the cycle counter and just
 * operate with the nanosecond field directly without fear of overflow.
 *
 * Much like the 82599, the update period is dependent upon the link speed:
 * At 40Gb, 25Gb, or no link, the period is 1.6ns.
 * At 10Gb or 5Gb link, the period is multiplied by 2. (3.2ns)
 * At 1Gb link, the period is multiplied by 20. (32ns)
 * 1588 functionality is not supported at 100Mbps.
 */
#define I40E_PTP_40GB_INCVAL		0x0199999999ULL
#define I40E_PTP_10GB_INCVAL_MULT	2
#define I40E_PTP_5GB_INCVAL_MULT	2
#define I40E_PTP_1GB_INCVAL_MULT	20
#define I40E_ISGN			0x80000000

#define I40E_PRTTSYN_CTL1_TSYNTYPE_V1  BIT(I40E_PRTTSYN_CTL1_TSYNTYPE_SHIFT)
#define I40E_PRTTSYN_CTL1_TSYNTYPE_V2  (2 << \
					I40E_PRTTSYN_CTL1_TSYNTYPE_SHIFT)
#define I40E_SUBDEV_ID_25G_PTP_PIN	0xB

enum i40e_ptp_pin {
	SDP3_2 = 0,
	SDP3_3,
	GPIO_4
};

enum i40e_can_set_pins {
	CANT_DO_PINS = -1,
	CAN_SET_PINS,
	CAN_DO_PINS
};

static struct ptp_pin_desc sdp_desc[] = {
	/* name     idx      func      chan */
	{"SDP3_2", SDP3_2, PTP_PF_NONE, 0},
	{"SDP3_3", SDP3_3, PTP_PF_NONE, 1},
	{"GPIO_4", GPIO_4, PTP_PF_NONE, 1},
};

enum i40e_ptp_gpio_pin_state {
	end = -2,
	invalid,
	off,
	in_A,
	in_B,
	out_A,
	out_B,
};

static const char * const i40e_ptp_gpio_pin_state2str[] = {
	"off", "in_A", "in_B", "out_A", "out_B"
};

enum i40e_ptp_led_pin_state {
	led_end = -2,
	low = 0,
	high,
};

struct i40e_ptp_pins_settings {
	enum i40e_ptp_gpio_pin_state sdp3_2;
	enum i40e_ptp_gpio_pin_state sdp3_3;
	enum i40e_ptp_gpio_pin_state gpio_4;
	enum i40e_ptp_led_pin_state led2_0;
	enum i40e_ptp_led_pin_state led2_1;
	enum i40e_ptp_led_pin_state led3_0;
	enum i40e_ptp_led_pin_state led3_1;
};

static const struct i40e_ptp_pins_settings
	i40e_ptp_pin_led_allowed_states[] = {
	{off,	off,	off,		high,	high,	high,	high},
	{off,	in_A,	off,		high,	high,	high,	low},
	{off,	out_A,	off,		high,	low,	high,	high},
	{off,	in_B,	off,		high,	high,	high,	low},
	{off,	out_B,	off,		high,	low,	high,	high},
	{in_A,	off,	off,		high,	high,	high,	low},
	{in_A,	in_B,	off,		high,	high,	high,	low},
	{in_A,	out_B,	off,		high,	low,	high,	high},
	{out_A,	off,	off,		high,	low,	high,	high},
	{out_A,	in_B,	off,		high,	low,	high,	high},
	{in_B,	off,	off,		high,	high,	high,	low},
	{in_B,	in_A,	off,		high,	high,	high,	low},
	{in_B,	out_A,	off,		high,	low,	high,	high},
	{out_B,	off,	off,		high,	low,	high,	high},
	{out_B,	in_A,	off,		high,	low,	high,	high},
	{off,	off,	in_A,		high,	high,	low,	high},
	{off,	out_A,	in_A,		high,	low,	low,	high},
	{off,	in_B,	in_A,		high,	high,	low,	low},
	{off,	out_B,	in_A,		high,	low,	low,	high},
	{out_A,	off,	in_A,		high,	low,	low,	high},
	{out_A,	in_B,	in_A,		high,	low,	low,	high},
	{in_B,	off,	in_A,		high,	high,	low,	low},
	{in_B,	out_A,	in_A,		high,	low,	low,	high},
	{out_B,	off,	in_A,		high,	low,	low,	high},
	{off,	off,	out_A,		low,	high,	high,	high},
	{off,	in_A,	out_A,		low,	high,	high,	low},
	{off,	in_B,	out_A,		low,	high,	high,	low},
	{off,	out_B,	out_A,		low,	low,	high,	high},
	{in_A,	off,	out_A,		low,	high,	high,	low},
	{in_A,	in_B,	out_A,		low,	high,	high,	low},
	{in_A,	out_B,	out_A,		low,	low,	high,	high},
	{in_B,	off,	out_A,		low,	high,	high,	low},
	{in_B,	in_A,	out_A,		low,	high,	high,	low},
	{out_B,	off,	out_A,		low,	low,	high,	high},
	{out_B,	in_A,	out_A,		low,	low,	high,	high},
	{off,	off,	in_B,		high,	high,	low,	high},
	{off,	in_A,	in_B,		high,	high,	low,	low},
	{off,	out_A,	in_B,		high,	low,	low,	high},
	{off,	out_B,	in_B,		high,	low,	low,	high},
	{in_A,	off,	in_B,		high,	high,	low,	low},
	{in_A,	out_B,	in_B,		high,	low,	low,	high},
	{out_A,	off,	in_B,		high,	low,	low,	high},
	{out_B,	off,	in_B,		high,	low,	low,	high},
	{out_B,	in_A,	in_B,		high,	low,	low,	high},
	{off,	off,	out_B,		low,	high,	high,	high},
	{off,	in_A,	out_B,		low,	high,	high,	low},
	{off,	out_A,	out_B,		low,	low,	high,	high},
	{off,	in_B,	out_B,		low,	high,	high,	low},
	{in_A,	off,	out_B,		low,	high,	high,	low},
	{in_A,	in_B,	out_B,		low,	high,	high,	low},
	{out_A,	off,	out_B,		low,	low,	high,	high},
	{out_A,	in_B,	out_B,		low,	low,	high,	high},
	{in_B,	off,	out_B,		low,	high,	high,	low},
	{in_B,	in_A,	out_B,		low,	high,	high,	low},
	{in_B,	out_A,	out_B,		low,	low,	high,	high},
	{end,	end,	end,	led_end, led_end, led_end, led_end}
};

static int i40e_ptp_set_pins(struct i40e_pf *pf,
			     struct i40e_ptp_pins_settings *pins);

/**
 * i40e_ptp_extts0_work - workqueue task function
 * @work: workqueue task structure
 *
 * Service for PTP external clock event
 **/
static void i40e_ptp_extts0_work(struct work_stru