Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 | /******************************************************************************* Copyright (C) 2013 Vayavya Labs Pvt Ltd This implements all the API for managing HW timestamp & PTP. This program is free software; you can redistribute it and/or modify it under the terms and conditions of the GNU General Public License, version 2, as published by the Free Software Foundation. This program is distributed in the hope it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. The full GNU General Public License is included in this distribution in the file called "COPYING". Author: Rayagond Kokatanur <rayagond@vayavyalabs.com> Author: Giuseppe Cavallaro <peppe.cavallaro@st.com> *******************************************************************************/ #include <linux/io.h> #include <linux/delay.h> #include "common.h" #include "stmmac_ptp.h" static void stmmac_config_hw_tstamping(void __iomem *ioaddr, u32 data) { writel(data, ioaddr + PTP_TCR); } static u32 stmmac_config_sub_second_increment(void __iomem *ioaddr, u32 ptp_clock) { u32 value = readl(ioaddr + PTP_TCR); unsigned long data; /* Convert the ptp_clock to nano second * formula = (2/ptp_clock) * 1000000000 * where, ptp_clock = 50MHz. */ data = (2000000000ULL / ptp_clock); /* 0.465ns accuracy */ if (!(value & PTP_TCR_TSCTRLSSR)) data = (data * 1000) / 465; writel(data, ioaddr + PTP_SSIR); return data; } static int stmmac_init_systime(void __iomem *ioaddr, u32 sec, u32 nsec) { int limit; u32 value; writel(sec, ioaddr + PTP_STSUR); writel(nsec, ioaddr + PTP_STNSUR); /* issue command to initialize the system time value */ value = readl(ioaddr + PTP_TCR); value |= PTP_TCR_TSINIT; writel(value, ioaddr + PTP_TCR); /* wait for present system time initialize to complete */ limit = 10; while (limit--) { if (!(readl(ioaddr + PTP_TCR) & PTP_TCR_TSINIT)) break; mdelay(10); } if (limit < 0) return -EBUSY; return 0; } static int stmmac_config_addend(void __iomem *ioaddr, u32 addend) { u32 value; int limit; writel(addend, ioaddr + PTP_TAR); /* issue command to update the addend value */ value = readl(ioaddr + PTP_TCR); value |= PTP_TCR_TSADDREG; writel(value, ioaddr + PTP_TCR); /* wait for present addend update to complete */ limit = 10; while (limit--) { if (!(readl(ioaddr + PTP_TCR) & PTP_TCR_TSADDREG)) break; mdelay(10); } if (limit < 0) return -EBUSY; return 0; } static int stmmac_adjust_systime(void __iomem *ioaddr, u32 sec, u32 nsec, int add_sub) { u32 value; int limit; writel(sec, ioaddr + PTP_STSUR); writel(((add_sub << PTP_STNSUR_ADDSUB_SHIFT) | nsec), ioaddr + PTP_STNSUR); /* issue command to initialize the system time value */ value = readl(ioaddr + PTP_TCR); value |= PTP_TCR_TSUPDT; writel(value, ioaddr + PTP_TCR); /* wait for present system time adjust/update to complete */ limit = 10; while (limit--) { if (!(readl(ioaddr + PTP_TCR) & PTP_TCR_TSUPDT)) break; mdelay(10); } if (limit < 0) return -EBUSY; return 0; } static u64 stmmac_get_systime(void __iomem *ioaddr) { u64 ns; ns = readl(ioaddr + PTP_STNSR); /* convert sec time value to nanosecond */ ns += readl(ioaddr + PTP_STSR) * 1000000000ULL; return ns; } const struct stmmac_hwtimestamp stmmac_ptp = { .config_hw_tstamping = stmmac_config_hw_tstamping, .init_systime = stmmac_init_systime, .config_sub_second_increment = stmmac_config_sub_second_increment, .config_addend = stmmac_config_addend, .adjust_systime = stmmac_adjust_systime, .get_systime = stmmac_get_systime, }; |