1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* Copyright (c) 2019, Vladimir Oltean <olteanv@gmail.com> 3 */ 4 #ifndef _SJA1105_PTP_H 5 #define _SJA1105_PTP_H 6 7 #include <linux/timer.h> 8 9 #if IS_ENABLED(CONFIG_NET_DSA_SJA1105_PTP) 10 11 /* Timestamps are in units of 8 ns clock ticks (equivalent to 12 * a fixed 125 MHz clock). 13 */ 14 #define SJA1105_TICK_NS 8 15 16 static inline s64 ns_to_sja1105_ticks(s64 ns) 17 { 18 return ns / SJA1105_TICK_NS; 19 } 20 21 static inline s64 sja1105_ticks_to_ns(s64 ticks) 22 { 23 return ticks * SJA1105_TICK_NS; 24 } 25 26 /* Calculate the first base_time in the future that satisfies this 27 * relationship: 28 * 29 * future_base_time = base_time + N x cycle_time >= now, or 30 * 31 * now - base_time 32 * N >= --------------- 33 * cycle_time 34 * 35 * Because N is an integer, the ceiling value of the above "a / b" ratio 36 * is in fact precisely the floor value of "(a + b - 1) / b", which is 37 * easier to calculate only having integer division tools. 38 */ 39 static inline s64 future_base_time(s64 base_time, s64 cycle_time, s64 now) 40 { 41 s64 a, b, n; 42 43 if (base_time >= now) 44 return base_time; 45 46 a = now - base_time; 47 b = cycle_time; 48 n = div_s64(a + b - 1, b); 49 50 return base_time + n * cycle_time; 51 } 52 53 /* This is not a preprocessor macro because the "ns" argument may or may not be 54 * s64 at caller side. This ensures it is properly type-cast before div_s64. 55 */ 56 static inline s64 ns_to_sja1105_delta(s64 ns) 57 { 58 return div_s64(ns, 200); 59 } 60 61 static inline s64 sja1105_delta_to_ns(s64 delta) 62 { 63 return delta * 200; 64 } 65 66 struct sja1105_ptp_cmd { 67 u64 startptpcp; /* start toggling PTP_CLK pin */ 68 u64 stopptpcp; /* stop toggling PTP_CLK pin */ 69 u64 ptpstrtsch; /* start schedule */ 70 u64 ptpstopsch; /* stop schedule */ 71 u64 resptp; /* reset */ 72 u64 corrclk4ts; /* use the corrected clock for timestamps */ 73 u64 ptpclkadd; /* enum sja1105_ptp_clk_mode */ 74 }; 75 76 struct sja1105_ptp_data { 77 struct timer_list extts_timer; 78 struct sk_buff_head skb_rxtstamp_queue; 79 struct ptp_clock_info caps; 80 struct ptp_clock *clock; 81 struct sja1105_ptp_cmd cmd; 82 /* Serializes all operations on the PTP hardware clock */ 83 struct mutex lock; 84 bool extts_enabled; 85 u64 ptpsyncts; 86 }; 87 88 int sja1105_ptp_clock_register(struct dsa_switch *ds); 89 90 void sja1105_ptp_clock_unregister(struct dsa_switch *ds); 91 92 void sja1105et_ptp_cmd_packing(u8 *buf, struct sja1105_ptp_cmd *cmd, 93 enum packing_op op); 94 95 void sja1105pqrs_ptp_cmd_packing(u8 *buf, struct sja1105_ptp_cmd *cmd, 96 enum packing_op op); 97 98 int sja1105_get_ts_info(struct dsa_switch *ds, int port, 99 struct ethtool_ts_info *ts); 100 101 void sja1105_ptp_txtstamp_skb(struct dsa_switch *ds, int slot, 102 struct sk_buff *clone); 103 104 bool sja1105_port_rxtstamp(struct dsa_switch *ds, int port, 105 struct sk_buff *skb, unsigned int type); 106 107 bool sja1105_port_txtstamp(struct dsa_switch *ds, int port, 108 struct sk_buff *skb, unsigned int type); 109 110 int sja1105_hwtstamp_get(struct dsa_switch *ds, int port, struct ifreq *ifr); 111 112 int sja1105_hwtstamp_set(struct dsa_switch *ds, int port, struct ifreq *ifr); 113 114 int __sja1105_ptp_gettimex(struct dsa_switch *ds, u64 *ns, 115 struct ptp_system_timestamp *sts); 116 117 int __sja1105_ptp_settime(struct dsa_switch *ds, u64 ns, 118 struct ptp_system_timestamp *ptp_sts); 119 120 int __sja1105_ptp_adjtime(struct dsa_switch *ds, s64 delta); 121 122 int sja1105_ptp_commit(struct dsa_switch *ds, struct sja1105_ptp_cmd *cmd, 123 sja1105_spi_rw_mode_t rw); 124 125 #else 126 127 struct sja1105_ptp_cmd; 128 129 /* Structures cannot be empty in C. Bah! 130 * Keep the mutex as the only element, which is a bit more difficult to 131 * refactor out of sja1105_main.c anyway. 132 */ 133 struct sja1105_ptp_data { 134 struct mutex lock; 135 }; 136 137 static inline int sja1105_ptp_clock_register(struct dsa_switch *ds) 138 { 139 return 0; 140 } 141 142 static inline void sja1105_ptp_clock_unregister(struct dsa_switch *ds) { } 143 144 static inline void sja1105_ptp_txtstamp_skb(struct dsa_switch *ds, int slot, 145 struct sk_buff *clone) 146 { 147 } 148 149 static inline int __sja1105_ptp_gettimex(struct dsa_switch *ds, u64 *ns, 150 struct ptp_system_timestamp *sts) 151 { 152 return 0; 153 } 154 155 static inline int __sja1105_ptp_settime(struct dsa_switch *ds, u64 ns, 156 struct ptp_system_timestamp *ptp_sts) 157 { 158 return 0; 159 } 160 161 static inline int __sja1105_ptp_adjtime(struct dsa_switch *ds, s64 delta) 162 { 163 return 0; 164 } 165 166 static inline int sja1105_ptp_commit(struct dsa_switch *ds, 167 struct sja1105_ptp_cmd *cmd, 168 sja1105_spi_rw_mode_t rw) 169 { 170 return 0; 171 } 172 173 #define sja1105et_ptp_cmd_packing NULL 174 175 #define sja1105pqrs_ptp_cmd_packing NULL 176 177 #define sja1105_get_ts_info NULL 178 179 #define sja1105_port_rxtstamp NULL 180 181 #define sja1105_port_txtstamp NULL 182 183 #define sja1105_hwtstamp_get NULL 184 185 #define sja1105_hwtstamp_set NULL 186 187 #endif /* IS_ENABLED(CONFIG_NET_DSA_SJA1105_PTP) */ 188 189 #endif /* _SJA1105_PTP_H */ 190