drivers/net/dsa/sja1105/sja1105_ptp.h

   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 */