1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* Copyright (c) 2019, Vladimir Oltean <olteanv@gmail.com>
7 #if IS_ENABLED(CONFIG_NET_DSA_SJA1105_PTP)
9 /* Timestamps are in units of 8 ns clock ticks (equivalent to
10 * a fixed 125 MHz clock).
12 #define SJA1105_TICK_NS 8
14 static inline s64 ns_to_sja1105_ticks(s64 ns)
16 return ns / SJA1105_TICK_NS;
19 static inline s64 sja1105_ticks_to_ns(s64 ticks)
21 return ticks * SJA1105_TICK_NS;
24 /* Calculate the first base_time in the future that satisfies this
27 * future_base_time = base_time + N x cycle_time >= now, or
30 * N >= ---------------
33 * Because N is an integer, the ceiling value of the above "a / b" ratio
34 * is in fact precisely the floor value of "(a + b - 1) / b", which is
35 * easier to calculate only having integer division tools.
37 static inline s64 future_base_time(s64 base_time, s64 cycle_time, s64 now)
46 n = div_s64(a + b - 1, b);
48 return base_time + n * cycle_time;
51 struct sja1105_ptp_cmd {
52 u64 startptpcp; /* start toggling PTP_CLK pin */
53 u64 stopptpcp; /* stop toggling PTP_CLK pin */
54 u64 ptpstrtsch; /* start schedule */
55 u64 ptpstopsch; /* stop schedule */
56 u64 resptp; /* reset */
57 u64 corrclk4ts; /* use the corrected clock for timestamps */
58 u64 ptpclkadd; /* enum sja1105_ptp_clk_mode */
61 struct sja1105_ptp_data {
62 struct delayed_work extts_work;
63 struct sk_buff_head skb_rxtstamp_queue;
64 struct ptp_clock_info caps;
65 struct ptp_clock *clock;
66 struct sja1105_ptp_cmd cmd;
67 /* Serializes all operations on the PTP hardware clock */
72 int sja1105_ptp_clock_register(struct dsa_switch *ds);
74 void sja1105_ptp_clock_unregister(struct dsa_switch *ds);
76 void sja1105et_ptp_cmd_packing(u8 *buf, struct sja1105_ptp_cmd *cmd,
79 void sja1105pqrs_ptp_cmd_packing(u8 *buf, struct sja1105_ptp_cmd *cmd,
82 int sja1105_get_ts_info(struct dsa_switch *ds, int port,
83 struct ethtool_ts_info *ts);
85 void sja1105_ptp_txtstamp_skb(struct dsa_switch *ds, int slot,
86 struct sk_buff *clone);
88 bool sja1105_port_rxtstamp(struct dsa_switch *ds, int port,
89 struct sk_buff *skb, unsigned int type);
91 bool sja1105_port_txtstamp(struct dsa_switch *ds, int port,
92 struct sk_buff *skb, unsigned int type);
94 int sja1105_hwtstamp_get(struct dsa_switch *ds, int port, struct ifreq *ifr);
96 int sja1105_hwtstamp_set(struct dsa_switch *ds, int port, struct ifreq *ifr);
98 int __sja1105_ptp_gettimex(struct dsa_switch *ds, u64 *ns,
99 struct ptp_system_timestamp *sts);
101 int __sja1105_ptp_settime(struct dsa_switch *ds, u64 ns,
102 struct ptp_system_timestamp *ptp_sts);
104 int __sja1105_ptp_adjtime(struct dsa_switch *ds, s64 delta);
106 int sja1105_ptp_commit(struct dsa_switch *ds, struct sja1105_ptp_cmd *cmd,
107 sja1105_spi_rw_mode_t rw);
111 struct sja1105_ptp_cmd;
113 /* Structures cannot be empty in C. Bah!
114 * Keep the mutex as the only element, which is a bit more difficult to
115 * refactor out of sja1105_main.c anyway.
117 struct sja1105_ptp_data {
121 static inline int sja1105_ptp_clock_register(struct dsa_switch *ds)
126 static inline void sja1105_ptp_clock_unregister(struct dsa_switch *ds) { }
128 static inline void sja1105_ptp_txtstamp_skb(struct dsa_switch *ds, int slot,
129 struct sk_buff *clone)
133 static inline int __sja1105_ptp_gettimex(struct dsa_switch *ds, u64 *ns,
134 struct ptp_system_timestamp *sts)
139 static inline int __sja1105_ptp_settime(struct dsa_switch *ds, u64 ns,
140 struct ptp_system_timestamp *ptp_sts)
145 static inline int __sja1105_ptp_adjtime(struct dsa_switch *ds, s64 delta)
150 static inline int sja1105_ptp_commit(struct dsa_switch *ds,
151 struct sja1105_ptp_cmd *cmd,
152 sja1105_spi_rw_mode_t rw)
157 #define sja1105et_ptp_cmd_packing NULL
159 #define sja1105pqrs_ptp_cmd_packing NULL
161 #define sja1105_get_ts_info NULL
163 #define sja1105_port_rxtstamp NULL
165 #define sja1105_port_txtstamp NULL
167 #define sja1105_hwtstamp_get NULL
169 #define sja1105_hwtstamp_set NULL
171 #endif /* IS_ENABLED(CONFIG_NET_DSA_SJA1105_PTP) */
173 #endif /* _SJA1105_PTP_H */