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