149 lines
3.8 KiB
C
149 lines
3.8 KiB
C
/*******************************************************************************
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Copyright (C) 2013 Vayavya Labs Pvt Ltd
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This implements all the API for managing HW timestamp & PTP.
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This program is free software; you can redistribute it and/or modify it
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under the terms and conditions of the GNU General Public License,
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version 2, as published by the Free Software Foundation.
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This program is distributed in the hope it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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more details.
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You should have received a copy of the GNU General Public License along with
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this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
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The full GNU General Public License is included in this distribution in
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the file called "COPYING".
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Author: Rayagond Kokatanur <rayagond@vayavyalabs.com>
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Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>
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*******************************************************************************/
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#include <linux/io.h>
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#include <linux/delay.h>
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#include "common.h"
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#include "stmmac_ptp.h"
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static void stmmac_config_hw_tstamping(void __iomem *ioaddr, u32 data)
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{
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writel(data, ioaddr + PTP_TCR);
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}
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static void stmmac_config_sub_second_increment(void __iomem *ioaddr)
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{
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u32 value = readl(ioaddr + PTP_TCR);
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unsigned long data;
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/* Convert the ptp_clock to nano second
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* formula = (1/ptp_clock) * 1000000000
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* where, ptp_clock = 50MHz.
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*/
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data = (1000000000ULL / 50000000);
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/* 0.465ns accuracy */
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if (!(value & PTP_TCR_TSCTRLSSR))
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data = (data * 1000) / 465;
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writel(data, ioaddr + PTP_SSIR);
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}
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static int stmmac_init_systime(void __iomem *ioaddr, u32 sec, u32 nsec)
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{
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int limit;
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u32 value;
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writel(sec, ioaddr + PTP_STSUR);
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writel(nsec, ioaddr + PTP_STNSUR);
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/* issue command to initialize the system time value */
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value = readl(ioaddr + PTP_TCR);
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value |= PTP_TCR_TSINIT;
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writel(value, ioaddr + PTP_TCR);
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/* wait for present system time initialize to complete */
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limit = 10;
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while (limit--) {
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if (!(readl(ioaddr + PTP_TCR) & PTP_TCR_TSINIT))
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break;
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mdelay(10);
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}
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if (limit < 0)
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return -EBUSY;
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return 0;
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}
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static int stmmac_config_addend(void __iomem *ioaddr, u32 addend)
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{
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u32 value;
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int limit;
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writel(addend, ioaddr + PTP_TAR);
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/* issue command to update the addend value */
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value = readl(ioaddr + PTP_TCR);
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value |= PTP_TCR_TSADDREG;
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writel(value, ioaddr + PTP_TCR);
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/* wait for present addend update to complete */
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limit = 10;
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while (limit--) {
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if (!(readl(ioaddr + PTP_TCR) & PTP_TCR_TSADDREG))
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break;
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mdelay(10);
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}
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if (limit < 0)
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return -EBUSY;
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return 0;
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}
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static int stmmac_adjust_systime(void __iomem *ioaddr, u32 sec, u32 nsec,
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int add_sub)
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{
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u32 value;
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int limit;
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writel(sec, ioaddr + PTP_STSUR);
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writel(((add_sub << PTP_STNSUR_ADDSUB_SHIFT) | nsec),
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ioaddr + PTP_STNSUR);
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/* issue command to initialize the system time value */
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value = readl(ioaddr + PTP_TCR);
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value |= PTP_TCR_TSUPDT;
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writel(value, ioaddr + PTP_TCR);
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/* wait for present system time adjust/update to complete */
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limit = 10;
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while (limit--) {
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if (!(readl(ioaddr + PTP_TCR) & PTP_TCR_TSUPDT))
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break;
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mdelay(10);
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}
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if (limit < 0)
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return -EBUSY;
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return 0;
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}
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static u64 stmmac_get_systime(void __iomem *ioaddr)
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{
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u64 ns;
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ns = readl(ioaddr + PTP_STNSR);
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/* convert sec time value to nanosecond */
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ns += readl(ioaddr + PTP_STSR) * 1000000000ULL;
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return ns;
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}
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const struct stmmac_hwtimestamp stmmac_ptp = {
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.config_hw_tstamping = stmmac_config_hw_tstamping,
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.init_systime = stmmac_init_systime,
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.config_sub_second_increment = stmmac_config_sub_second_increment,
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.config_addend = stmmac_config_addend,
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.adjust_systime = stmmac_adjust_systime,
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.get_systime = stmmac_get_systime,
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};
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