1 // SPDX-License-Identifier: GPL-2.0-only
2 /*******************************************************************************
3 Copyright (C) 2013 Vayavya Labs Pvt Ltd
5 This implements all the API for managing HW timestamp & PTP.
8 Author: Rayagond Kokatanur <rayagond@vayavyalabs.com>
9 Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>
10 *******************************************************************************/
13 #include <linux/delay.h>
15 #include "stmmac_ptp.h"
17 static void config_hw_tstamping(void __iomem *ioaddr, u32 data)
19 writel(data, ioaddr + PTP_TCR);
22 static void config_sub_second_increment(void __iomem *ioaddr,
23 u32 ptp_clock, int gmac4, u32 *ssinc)
25 u32 value = readl(ioaddr + PTP_TCR);
29 /* For GMAC3.x, 4.x versions, convert the ptp_clock to nano second
30 * formula = (1/ptp_clock) * 1000000000
31 * where ptp_clock is 50MHz if fine method is used to update system
33 if (value & PTP_TCR_TSCFUPDT)
34 data = (1000000000ULL / 50000000);
36 data = (1000000000ULL / ptp_clock);
38 /* 0.465ns accuracy */
39 if (!(value & PTP_TCR_TSCTRLSSR))
40 data = (data * 1000) / 465;
42 data &= PTP_SSIR_SSINC_MASK;
46 reg_value <<= GMAC4_PTP_SSIR_SSINC_SHIFT;
48 writel(reg_value, ioaddr + PTP_SSIR);
54 static int init_systime(void __iomem *ioaddr, u32 sec, u32 nsec)
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);
66 /* wait for present system time initialize to complete */
69 if (!(readl(ioaddr + PTP_TCR) & PTP_TCR_TSINIT))
79 static int config_addend(void __iomem *ioaddr, u32 addend)
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);
90 /* wait for present addend update to complete */
93 if (!(readl(ioaddr + PTP_TCR) & PTP_TCR_TSADDREG))
103 static int adjust_systime(void __iomem *ioaddr, u32 sec, u32 nsec,
104 int add_sub, int gmac4)
110 /* If the new sec value needs to be subtracted with
111 * the system time, then MAC_STSUR reg should be
112 * programmed with (2^32 – <new_sec_value>)
117 value = readl(ioaddr + PTP_TCR);
118 if (value & PTP_TCR_TSCTRLSSR)
119 nsec = (PTP_DIGITAL_ROLLOVER_MODE - nsec);
121 nsec = (PTP_BINARY_ROLLOVER_MODE - nsec);
124 writel(sec, ioaddr + PTP_STSUR);
125 value = (add_sub << PTP_STNSUR_ADDSUB_SHIFT) | nsec;
126 writel(value, ioaddr + PTP_STNSUR);
128 /* issue command to initialize the system time value */
129 value = readl(ioaddr + PTP_TCR);
130 value |= PTP_TCR_TSUPDT;
131 writel(value, ioaddr + PTP_TCR);
133 /* wait for present system time adjust/update to complete */
136 if (!(readl(ioaddr + PTP_TCR) & PTP_TCR_TSUPDT))
146 static void get_systime(void __iomem *ioaddr, u64 *systime)
150 /* Get the TSSS value */
151 ns = readl(ioaddr + PTP_STNSR);
152 /* Get the TSS and convert sec time value to nanosecond */
153 ns += readl(ioaddr + PTP_STSR) * 1000000000ULL;
159 const struct stmmac_hwtimestamp stmmac_ptp = {
160 .config_hw_tstamping = config_hw_tstamping,
161 .init_systime = init_systime,
162 .config_sub_second_increment = config_sub_second_increment,
163 .config_addend = config_addend,
164 .adjust_systime = adjust_systime,
165 .get_systime = get_systime,