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/* SPDX-License-Identifier: GPL-2.0 */
/* Copyright (c) 2019, Vladimir Oltean <olteanv@gmail.com>
*/
#ifndef _SJA1105_PTP_H
#define _SJA1105_PTP_H
#include <linux/timer.h>
#if IS_ENABLED(CONFIG_NET_DSA_SJA1105_PTP)
/* Timestamps are in units of 8 ns clock ticks (equivalent to
* a fixed 125 MHz clock).
*/
#define SJA1105_TICK_NS 8
static inline s64 ns_to_sja1105_ticks(s64 ns)
{
return ns / SJA1105_TICK_NS;
}
static inline s64 sja1105_ticks_to_ns(s64 ticks)
{
return ticks * SJA1105_TICK_NS;
}
/* Calculate the first base_time in the future that satisfies this
* relationship:
*
* future_base_time = base_time + N x cycle_time >= now, or
*
* now - base_time
* N >= ---------------
* cycle_time
*
* Because N is an integer, the ceiling value of the above "a / b" ratio
* is in fact precisely the floor value of "(a + b - 1) / b", which is
* easier to calculate only having integer division tools.
*/
static inline s64 future_base_time(s64 base_time, s64 cycle_time, s64 now)
{
s64 a, b, n;
if (base_time >= now)
return base_time;
a = now - base_time;
b = cycle_time;
n = div_s64(a + b - 1, b);
return base_time + n * cycle_time;
}
/* This is not a preprocessor macro because the "ns" argument may or may not be
* s64 at caller side. This ensures it is properly type-cast before div_s64.
*/
static inline s64 ns_to_sja1105_delta(s64 ns)
{
return div_s64(ns, 200);
}
static inline s64 sja1105_delta_to_ns(s64 delta)
{
return delta * 200;
}
struct sja1105_ptp_cmd {
u64 startptpcp; /* start toggling PTP_CLK pin */
u64 stopptpcp; /* stop toggling PTP_CLK pin */
u64 ptpstrtsch; /* start schedule */
u64 ptpstopsch; /* stop schedule */
u64 resptp; /* reset */
u64 corrclk4ts; /* use the corrected clock for timestamps */
u64 ptpclkadd; /* enum sja1105_ptp_clk_mode */
};
struct sja1105_ptp_data {
struct timer_list extts_timer;
struct sk_buff_head skb_rxtstamp_queue;
struct ptp_clock_info caps;
struct ptp_clock *clock;
struct sja1105_ptp_cmd cmd;
/* Serializes all operations on the PTP hardware clock */
struct mutex lock;
bool extts_enabled;
u64 ptpsyncts;
};
int sja1105_ptp_clock_register(struct dsa_switch *ds);
void sja1105_ptp_clock_unregister(struct dsa_switch *ds);
void sja1105et_ptp_cmd_packing(u8 *buf, struct sja1105_ptp_cmd *cmd,
enum packing_op op);
void sja1105pqrs_ptp_cmd_packing(u8 *buf, struct sja1105_ptp_cmd *cmd,
enum packing_op op);
int sja1105_get_ts_info(struct dsa_switch *ds, int port,
struct ethtool_ts_info *ts);
void sja1105_ptp_txtstamp_skb(struct dsa_switch *ds, int slot,
struct sk_buff *clone);
bool sja1105_port_rxtstamp(struct dsa_switch *ds, int port,
struct sk_buff *skb, unsigned int type);
bool sja1105_port_txtstamp(struct dsa_switch *ds, int port,
struct sk_buff *skb, unsigned int type);
int sja1105_hwtstamp_get(struct dsa_switch *ds, int port, struct ifreq *ifr);
int sja1105_hwtstamp_set(struct dsa_switch *ds, int port, struct ifreq *ifr);
int __sja1105_ptp_gettimex(struct dsa_switch *ds, u64 *ns,
struct ptp_system_timestamp *sts);
int __sja1105_ptp_settime(struct dsa_switch *ds, u64 ns,
struct ptp_system_timestamp *ptp_sts);
int __sja1105_ptp_adjtime(struct dsa_switch *ds, s64 delta);
int sja1105_ptp_commit(struct dsa_switch *ds, struct sja1105_ptp_cmd *cmd,
sja1105_spi_rw_mode_t rw);
#else
struct sja1105_ptp_cmd;
/* Structures cannot be empty in C. Bah!
* Keep the mutex as the only element, which is a bit more difficult to
* refactor out of sja1105_main.c anyway.
*/
struct sja1105_ptp_data {
struct mutex lock;
};
static inline int sja1105_ptp_clock_register(struct dsa_switch *ds)
{
return 0;
}
static inline void sja1105_ptp_clock_unregister(struct dsa_switch *ds) { }
static inline void sja1105_ptp_txtstamp_skb(struct dsa_switch *ds, int slot,
struct sk_buff *clone)
{
}
static inline int __sja1105_ptp_gettimex(struct dsa_switch *ds, u64 *ns,
struct ptp_system_timestamp *sts)
{
return 0;
}
static inline int __sja1105_ptp_settime(struct dsa_switch *ds, u64 ns,
struct ptp_system_timestamp *ptp_sts)
{
return 0;
}
static inline int __sja1105_ptp_adjtime(struct dsa_switch *ds, s64 delta)
{
return 0;
}
static inline int sja1105_ptp_commit(struct dsa_switch *ds,
struct sja1105_ptp_cmd *cmd,
sja1105_spi_rw_mode_t rw)
{
return 0;
}
#define sja1105et_ptp_cmd_packing NULL
#define sja1105pqrs_ptp_cmd_packing NULL
#define sja1105_get_ts_info NULL
#define sja1105_port_rxtstamp NULL
#define sja1105_port_txtstamp NULL
#define sja1105_hwtstamp_get NULL
#define sja1105_hwtstamp_set NULL
#endif /* IS_ENABLED(CONFIG_NET_DSA_SJA1105_PTP) */
#endif /* _SJA1105_PTP_H */
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