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 The full GNU General Public License is included in this distribution in 16 the file called "COPYING". 17 18 Author: Rayagond Kokatanur <rayagond@vayavyalabs.com> 19 Author: Giuseppe Cavallaro <peppe.cavallaro@st.com> 20 *******************************************************************************/ 21 22 #include <linux/io.h> 23 #include <linux/delay.h> 24 #include "common.h" 25 #include "stmmac_ptp.h" 26 27 static void config_hw_tstamping(void __iomem *ioaddr, u32 data) 28 { 29 writel(data, ioaddr + PTP_TCR); 30 } 31 32 static void config_sub_second_increment(void __iomem *ioaddr, 33 u32 ptp_clock, int gmac4, u32 *ssinc) 34 { 35 u32 value = readl(ioaddr + PTP_TCR); 36 unsigned long data; 37 u32 reg_value; 38 39 /* For GMAC3.x, 4.x versions, convert the ptp_clock to nano second 40 * formula = (1/ptp_clock) * 1000000000 41 * where ptp_clock is 50MHz if fine method is used to update system 42 */ 43 if (value & PTP_TCR_TSCFUPDT) 44 data = (1000000000ULL / 50000000); 45 else 46 data = (1000000000ULL / ptp_clock); 47 48 /* 0.465ns accuracy */ 49 if (!(value & PTP_TCR_TSCTRLSSR)) 50 data = (data * 1000) / 465; 51 52 data &= PTP_SSIR_SSINC_MASK; 53 54 reg_value = data; 55 if (gmac4) 56 reg_value <<= GMAC4_PTP_SSIR_SSINC_SHIFT; 57 58 writel(reg_value, ioaddr + PTP_SSIR); 59 60 if (ssinc) 61 *ssinc = data; 62 } 63 64 static int init_systime(void __iomem *ioaddr, u32 sec, u32 nsec) 65 { 66 int limit; 67 u32 value; 68 69 writel(sec, ioaddr + PTP_STSUR); 70 writel(nsec, ioaddr + PTP_STNSUR); 71 /* issue command to initialize the system time value */ 72 value = readl(ioaddr + PTP_TCR); 73 value |= PTP_TCR_TSINIT; 74 writel(value, ioaddr + PTP_TCR); 75 76 /* wait for present system time initialize to complete */ 77 limit = 10; 78 while (limit--) { 79 if (!(readl(ioaddr + PTP_TCR) & PTP_TCR_TSINIT)) 80 break; 81 mdelay(10); 82 } 83 if (limit < 0) 84 return -EBUSY; 85 86 return 0; 87 } 88 89 static int config_addend(void __iomem *ioaddr, u32 addend) 90 { 91 u32 value; 92 int limit; 93 94 writel(addend, ioaddr + PTP_TAR); 95 /* issue command to update the addend value */ 96 value = readl(ioaddr + PTP_TCR); 97 value |= PTP_TCR_TSADDREG; 98 writel(value, ioaddr + PTP_TCR); 99 100 /* wait for present addend update to complete */ 101 limit = 10; 102 while (limit--) { 103 if (!(readl(ioaddr + PTP_TCR) & PTP_TCR_TSADDREG)) 104 break; 105 mdelay(10); 106 } 107 if (limit < 0) 108 return -EBUSY; 109 110 return 0; 111 } 112 113 static int adjust_systime(void __iomem *ioaddr, u32 sec, u32 nsec, 114 int add_sub, int gmac4) 115 { 116 u32 value; 117 int limit; 118 119 if (add_sub) { 120 /* If the new sec value needs to be subtracted with 121 * the system time, then MAC_STSUR reg should be 122 * programmed with (2^32 – <new_sec_value>) 123 */ 124 if (gmac4) 125 sec = (100000000ULL - sec); 126 127 value = readl(ioaddr + PTP_TCR); 128 if (value & PTP_TCR_TSCTRLSSR) 129 nsec = (PTP_DIGITAL_ROLLOVER_MODE - nsec); 130 else 131 nsec = (PTP_BINARY_ROLLOVER_MODE - nsec); 132 } 133 134 writel(sec, ioaddr + PTP_STSUR); 135 value = (add_sub << PTP_STNSUR_ADDSUB_SHIFT) | nsec; 136 writel(value, ioaddr + PTP_STNSUR); 137 138 /* issue command to initialize the system time value */ 139 value = readl(ioaddr + PTP_TCR); 140 value |= PTP_TCR_TSUPDT; 141 writel(value, ioaddr + PTP_TCR); 142 143 /* wait for present system time adjust/update to complete */ 144 limit = 10; 145 while (limit--) { 146 if (!(readl(ioaddr + PTP_TCR) & PTP_TCR_TSUPDT)) 147 break; 148 mdelay(10); 149 } 150 if (limit < 0) 151 return -EBUSY; 152 153 return 0; 154 } 155 156 static void get_systime(void __iomem *ioaddr, u64 *systime) 157 { 158 u64 ns; 159 160 /* Get the TSSS value */ 161 ns = readl(ioaddr + PTP_STNSR); 162 /* Get the TSS and convert sec time value to nanosecond */ 163 ns += readl(ioaddr + PTP_STSR) * 1000000000ULL; 164 165 if (systime) 166 *systime = ns; 167 } 168 169 const struct stmmac_hwtimestamp stmmac_ptp = { 170 .config_hw_tstamping = config_hw_tstamping, 171 .init_systime = init_systime, 172 .config_sub_second_increment = config_sub_second_increment, 173 .config_addend = config_addend, 174 .adjust_systime = adjust_systime, 175 .get_systime = get_systime, 176 }; 177