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
16static inline s64 ns_to_sja1105_ticks(s64 ns)
17{
18	return ns / SJA1105_TICK_NS;
19}
20
21static 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 */
39static 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 */
56static inline s64 ns_to_sja1105_delta(s64 ns)
57{
58	return div_s64(ns, 200);
59}
60
61static inline s64 sja1105_delta_to_ns(s64 delta)
62{
63	return delta * 200;
64}
65
66struct 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
76struct sja1105_ptp_data {
77	struct timer_list extts_timer;
78	/* Used only on SJA1105 to reconstruct partial timestamps */
79	struct sk_buff_head skb_rxtstamp_queue;
80	/* Used on SJA1110 where meta frames are generated only for
81	 * 2-step TX timestamps
82	 */
83	struct sk_buff_head skb_txtstamp_queue;
84	struct ptp_clock_info caps;
85	struct ptp_clock *clock;
86	struct sja1105_ptp_cmd cmd;
87	/* Serializes all operations on the PTP hardware clock */
88	struct mutex lock;
89	bool extts_enabled;
90	u64 ptpsyncts;
91};
92
93int sja1105_ptp_clock_register(struct dsa_switch *ds);
94
95void sja1105_ptp_clock_unregister(struct dsa_switch *ds);
96
97void sja1105et_ptp_cmd_packing(u8 *buf, struct sja1105_ptp_cmd *cmd,
98			       enum packing_op op);
99
100void sja1105pqrs_ptp_cmd_packing(u8 *buf, struct sja1105_ptp_cmd *cmd,
101				 enum packing_op op);
102
103int sja1105_get_ts_info(struct dsa_switch *ds, int port,
104			struct ethtool_ts_info *ts);
105
106void sja1105_ptp_txtstamp_skb(struct dsa_switch *ds, int slot,
107			      struct sk_buff *clone);
108
109bool sja1105_port_rxtstamp(struct dsa_switch *ds, int port,
110			   struct sk_buff *skb, unsigned int type);
111
112void sja1105_port_txtstamp(struct dsa_switch *ds, int port,
113			   struct sk_buff *skb);
114
115int sja1105_hwtstamp_get(struct dsa_switch *ds, int port, struct ifreq *ifr);
116
117int sja1105_hwtstamp_set(struct dsa_switch *ds, int port, struct ifreq *ifr);
118
119int __sja1105_ptp_gettimex(struct dsa_switch *ds, u64 *ns,
120			   struct ptp_system_timestamp *sts);
121
122int __sja1105_ptp_settime(struct dsa_switch *ds, u64 ns,
123			  struct ptp_system_timestamp *ptp_sts);
124
125int __sja1105_ptp_adjtime(struct dsa_switch *ds, s64 delta);
126
127int sja1105_ptp_commit(struct dsa_switch *ds, struct sja1105_ptp_cmd *cmd,
128		       sja1105_spi_rw_mode_t rw);
129
130bool sja1105_rxtstamp(struct dsa_switch *ds, int port, struct sk_buff *skb);
131bool sja1110_rxtstamp(struct dsa_switch *ds, int port, struct sk_buff *skb);
132void sja1110_txtstamp(struct dsa_switch *ds, int port, struct sk_buff *skb);
133
134void sja1110_process_meta_tstamp(struct dsa_switch *ds, int port, u8 ts_id,
135				 enum sja1110_meta_tstamp dir, u64 tstamp);
136
137#else
138
139struct sja1105_ptp_cmd;
140
141/* Structures cannot be empty in C. Bah!
142 * Keep the mutex as the only element, which is a bit more difficult to
143 * refactor out of sja1105_main.c anyway.
144 */
145struct sja1105_ptp_data {
146	struct mutex lock;
147};
148
149static inline int sja1105_ptp_clock_register(struct dsa_switch *ds)
150{
151	return 0;
152}
153
154static inline void sja1105_ptp_clock_unregister(struct dsa_switch *ds) { }
155
156static inline void sja1105_ptp_txtstamp_skb(struct dsa_switch *ds, int slot,
157					    struct sk_buff *clone)
158{
159}
160
161static inline int __sja1105_ptp_gettimex(struct dsa_switch *ds, u64 *ns,
162					 struct ptp_system_timestamp *sts)
163{
164	return 0;
165}
166
167static inline int __sja1105_ptp_settime(struct dsa_switch *ds, u64 ns,
168					struct ptp_system_timestamp *ptp_sts)
169{
170	return 0;
171}
172
173static inline int __sja1105_ptp_adjtime(struct dsa_switch *ds, s64 delta)
174{
175	return 0;
176}
177
178static inline int sja1105_ptp_commit(struct dsa_switch *ds,
179				     struct sja1105_ptp_cmd *cmd,
180				     sja1105_spi_rw_mode_t rw)
181{
182	return 0;
183}
184
185#define sja1105et_ptp_cmd_packing NULL
186
187#define sja1105pqrs_ptp_cmd_packing NULL
188
189#define sja1105_get_ts_info NULL
190
191#define sja1105_port_rxtstamp NULL
192
193#define sja1105_port_txtstamp NULL
194
195#define sja1105_hwtstamp_get NULL
196
197#define sja1105_hwtstamp_set NULL
198
199#define sja1105_rxtstamp NULL
200#define sja1110_rxtstamp NULL
201#define sja1110_txtstamp NULL
202
203#define sja1110_process_meta_tstamp NULL
204
205#endif /* IS_ENABLED(CONFIG_NET_DSA_SJA1105_PTP) */
206
207#endif /* _SJA1105_PTP_H */
208