1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* Copyright (c) 2019, Vladimir Oltean <olteanv@gmail.com>
7 #include <linux/timer.h>
9 #if IS_ENABLED(CONFIG_NET_DSA_SJA1105_PTP)
11 /* Calculate the first base_time in the future that satisfies this
14 * future_base_time = base_time + N x cycle_time >= now, or
17 * N >= ---------------
20 * Because N is an integer, the ceiling value of the above "a / b" ratio
21 * is in fact precisely the floor value of "(a + b - 1) / b", which is
22 * easier to calculate only having integer division tools.
24 static inline s64 future_base_time(s64 base_time, s64 cycle_time, s64 now)
33 n = div_s64(a + b - 1, b);
35 return base_time + n * cycle_time;
38 /* This is not a preprocessor macro because the "ns" argument may or may not be
39 * s64 at caller side. This ensures it is properly type-cast before div_s64.
41 static inline s64 ns_to_sja1105_delta(s64 ns)
43 return div_s64(ns, 200);
46 static inline s64 sja1105_delta_to_ns(s64 delta)
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 timer_list extts_timer;
63 /* Used only on SJA1105 to reconstruct partial timestamps */
64 struct sk_buff_head skb_rxtstamp_queue;
65 struct ptp_clock_info caps;
66 struct ptp_clock *clock;
67 struct sja1105_ptp_cmd cmd;
68 /* Serializes all operations on the PTP hardware clock */
74 int sja1105_ptp_clock_register(struct dsa_switch *ds);
76 void sja1105_ptp_clock_unregister(struct dsa_switch *ds);
78 void sja1105et_ptp_cmd_packing(u8 *buf, struct sja1105_ptp_cmd *cmd,
81 void sja1105pqrs_ptp_cmd_packing(u8 *buf, struct sja1105_ptp_cmd *cmd,
84 int sja1105_get_ts_info(struct dsa_switch *ds, int port,
85 struct ethtool_ts_info *ts);
87 void sja1105_ptp_txtstamp_skb(struct dsa_switch *ds, int slot,
88 struct sk_buff *clone);
90 bool sja1105_port_rxtstamp(struct dsa_switch *ds, int port,
91 struct sk_buff *skb, unsigned int type);
93 void sja1105_port_txtstamp(struct dsa_switch *ds, int port,
96 int sja1105_hwtstamp_get(struct dsa_switch *ds, int port, struct ifreq *ifr);
98 int sja1105_hwtstamp_set(struct dsa_switch *ds, int port, struct ifreq *ifr);
100 int __sja1105_ptp_gettimex(struct dsa_switch *ds, u64 *ns,
101 struct ptp_system_timestamp *sts);
103 int __sja1105_ptp_settime(struct dsa_switch *ds, u64 ns,
104 struct ptp_system_timestamp *ptp_sts);
106 int __sja1105_ptp_adjtime(struct dsa_switch *ds, s64 delta);
108 int sja1105_ptp_commit(struct dsa_switch *ds, struct sja1105_ptp_cmd *cmd,
109 sja1105_spi_rw_mode_t rw);
111 bool sja1105_rxtstamp(struct dsa_switch *ds, int port, struct sk_buff *skb);
112 bool sja1110_rxtstamp(struct dsa_switch *ds, int port, struct sk_buff *skb);
113 void sja1110_txtstamp(struct dsa_switch *ds, int port, struct sk_buff *skb);
117 struct sja1105_ptp_cmd;
119 /* Structures cannot be empty in C. Bah!
120 * Keep the mutex as the only element, which is a bit more difficult to
121 * refactor out of sja1105_main.c anyway.
123 struct sja1105_ptp_data {
127 static inline int sja1105_ptp_clock_register(struct dsa_switch *ds)
132 static inline void sja1105_ptp_clock_unregister(struct dsa_switch *ds) { }
134 static inline void sja1105_ptp_txtstamp_skb(struct dsa_switch *ds, int slot,
135 struct sk_buff *clone)
139 static inline int __sja1105_ptp_gettimex(struct dsa_switch *ds, u64 *ns,
140 struct ptp_system_timestamp *sts)
145 static inline int __sja1105_ptp_settime(struct dsa_switch *ds, u64 ns,
146 struct ptp_system_timestamp *ptp_sts)
151 static inline int __sja1105_ptp_adjtime(struct dsa_switch *ds, s64 delta)
156 static inline int sja1105_ptp_commit(struct dsa_switch *ds,
157 struct sja1105_ptp_cmd *cmd,
158 sja1105_spi_rw_mode_t rw)
163 #define sja1105et_ptp_cmd_packing NULL
165 #define sja1105pqrs_ptp_cmd_packing NULL
167 #define sja1105_get_ts_info NULL
169 #define sja1105_port_rxtstamp NULL
171 #define sja1105_port_txtstamp NULL
173 #define sja1105_hwtstamp_get NULL
175 #define sja1105_hwtstamp_set NULL
177 #define sja1105_rxtstamp NULL
178 #define sja1110_rxtstamp NULL
179 #define sja1110_txtstamp NULL
181 #endif /* IS_ENABLED(CONFIG_NET_DSA_SJA1105_PTP) */
183 #endif /* _SJA1105_PTP_H */