1 /*******************************************************************************
2 Copyright (C) 2013 Vayavya Labs Pvt Ltd
3
4 This implements all the API for managing HW timestamp & PTP.
5
6 This program is free software; you can redistribute it and/or modify it
7 under the terms and conditions of the GNU General Public License,
8 version 2, as published by the Free Software Foundation.
9
10 This program is distributed in the hope it will be useful, but WITHOUT
11 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 more details.
14
15 You should have received a copy of the GNU General Public License along with
16 this program; if not, write to the Free Software Foundation, Inc.,
17 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
18
19 The full GNU General Public License is included in this distribution in
20 the file called "COPYING".
21
22 Author: Rayagond Kokatanur <rayagond@vayavyalabs.com>
23 Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>
24 *******************************************************************************/
25
26 #include <linux/io.h>
27 #include <linux/delay.h>
28 #include "common.h"
29 #include "stmmac_ptp.h"
30
stmmac_config_hw_tstamping(void __iomem * ioaddr,u32 data)31 static void stmmac_config_hw_tstamping(void __iomem *ioaddr, u32 data)
32 {
33 writel(data, ioaddr + PTP_TCR);
34 }
35
stmmac_config_sub_second_increment(void __iomem * ioaddr)36 static void stmmac_config_sub_second_increment(void __iomem *ioaddr)
37 {
38 u32 value = readl(ioaddr + PTP_TCR);
39 unsigned long data;
40
41 /* Convert the ptp_clock to nano second
42 * formula = (1/ptp_clock) * 1000000000
43 * where, ptp_clock = 50MHz.
44 */
45 data = (1000000000ULL / 50000000);
46
47 /* 0.465ns accuracy */
48 if (!(value & PTP_TCR_TSCTRLSSR))
49 data = (data * 1000) / 465;
50
51 writel(data, ioaddr + PTP_SSIR);
52 }
53
stmmac_init_systime(void __iomem * ioaddr,u32 sec,u32 nsec)54 static int stmmac_init_systime(void __iomem *ioaddr, u32 sec, u32 nsec)
55 {
56 int limit;
57 u32 value;
58
59 writel(sec, ioaddr + PTP_STSUR);
60 writel(nsec, ioaddr + PTP_STNSUR);
61 /* issue command to initialize the system time value */
62 value = readl(ioaddr + PTP_TCR);
63 value |= PTP_TCR_TSINIT;
64 writel(value, ioaddr + PTP_TCR);
65
66 /* wait for present system time initialize to complete */
67 limit = 10;
68 while (limit--) {
69 if (!(readl(ioaddr + PTP_TCR) & PTP_TCR_TSINIT))
70 break;
71 mdelay(10);
72 }
73 if (limit < 0)
74 return -EBUSY;
75
76 return 0;
77 }
78
stmmac_config_addend(void __iomem * ioaddr,u32 addend)79 static int stmmac_config_addend(void __iomem *ioaddr, u32 addend)
80 {
81 u32 value;
82 int limit;
83
84 writel(addend, ioaddr + PTP_TAR);
85 /* issue command to update the addend value */
86 value = readl(ioaddr + PTP_TCR);
87 value |= PTP_TCR_TSADDREG;
88 writel(value, ioaddr + PTP_TCR);
89
90 /* wait for present addend update to complete */
91 limit = 10;
92 while (limit--) {
93 if (!(readl(ioaddr + PTP_TCR) & PTP_TCR_TSADDREG))
94 break;
95 mdelay(10);
96 }
97 if (limit < 0)
98 return -EBUSY;
99
100 return 0;
101 }
102
stmmac_adjust_systime(void __iomem * ioaddr,u32 sec,u32 nsec,int add_sub)103 static int stmmac_adjust_systime(void __iomem *ioaddr, u32 sec, u32 nsec,
104 int add_sub)
105 {
106 u32 value;
107 int limit;
108
109 writel(sec, ioaddr + PTP_STSUR);
110 writel(((add_sub << PTP_STNSUR_ADDSUB_SHIFT) | nsec),
111 ioaddr + PTP_STNSUR);
112 /* issue command to initialize the system time value */
113 value = readl(ioaddr + PTP_TCR);
114 value |= PTP_TCR_TSUPDT;
115 writel(value, ioaddr + PTP_TCR);
116
117 /* wait for present system time adjust/update to complete */
118 limit = 10;
119 while (limit--) {
120 if (!(readl(ioaddr + PTP_TCR) & PTP_TCR_TSUPDT))
121 break;
122 mdelay(10);
123 }
124 if (limit < 0)
125 return -EBUSY;
126
127 return 0;
128 }
129
stmmac_get_systime(void __iomem * ioaddr)130 static u64 stmmac_get_systime(void __iomem *ioaddr)
131 {
132 u64 ns;
133
134 ns = readl(ioaddr + PTP_STNSR);
135 /* convert sec time value to nanosecond */
136 ns += readl(ioaddr + PTP_STSR) * 1000000000ULL;
137
138 return ns;
139 }
140
141 const struct stmmac_hwtimestamp stmmac_ptp = {
142 .config_hw_tstamping = stmmac_config_hw_tstamping,
143 .init_systime = stmmac_init_systime,
144 .config_sub_second_increment = stmmac_config_sub_second_increment,
145 .config_addend = stmmac_config_addend,
146 .adjust_systime = stmmac_adjust_systime,
147 .get_systime = stmmac_get_systime,
148 };
149