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// SPDX-License-Identifier: GPL-2.0-only
/*******************************************************************************
Copyright (C) 2013 Vayavya Labs Pvt Ltd
This implements all the API for managing HW timestamp & PTP.
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 config_hw_tstamping(void __iomem *ioaddr, u32 data)
{
writel(data, ioaddr + PTP_TCR);
}
static void config_sub_second_increment(void __iomem *ioaddr,
u32 ptp_clock, int gmac4, u32 *ssinc)
{
u32 value = readl(ioaddr + PTP_TCR);
unsigned long data;
u32 reg_value;
/* For GMAC3.x, 4.x versions, convert the ptp_clock to nano second
* formula = (1/ptp_clock) * 1000000000
* where ptp_clock is 50MHz if fine method is used to update system
*/
if (value & PTP_TCR_TSCFUPDT)
data = (1000000000ULL / 50000000);
else
data = (1000000000ULL / ptp_clock);
/* 0.465ns accuracy */
if (!(value & PTP_TCR_TSCTRLSSR))
data = (data * 1000) / 465;
data &= PTP_SSIR_SSINC_MASK;
reg_value = data;
if (gmac4)
reg_value <<= GMAC4_PTP_SSIR_SSINC_SHIFT;
writel(reg_value, ioaddr + PTP_SSIR);
if (ssinc)
*ssinc = data;
}
static int 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 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 adjust_systime(void __iomem *ioaddr, u32 sec, u32 nsec,
int add_sub, int gmac4)
{
u32 value;
int limit;
if (add_sub) {
/* If the new sec value needs to be subtracted with
* the system time, then MAC_STSUR reg should be
* programmed with (2^32 – <new_sec_value>)
*/
if (gmac4)
sec = (100000000ULL - sec);
value = readl(ioaddr + PTP_TCR);
if (value & PTP_TCR_TSCTRLSSR)
nsec = (PTP_DIGITAL_ROLLOVER_MODE - nsec);
else
nsec = (PTP_BINARY_ROLLOVER_MODE - nsec);
}
writel(sec, ioaddr + PTP_STSUR);
value = (add_sub << PTP_STNSUR_ADDSUB_SHIFT) | nsec;
writel(value, 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 void get_systime(void __iomem *ioaddr, u64 *systime)
{
u64 ns;
/* Get the TSSS value */
ns = readl(ioaddr + PTP_STNSR);
/* Get the TSS and convert sec time value to nanosecond */
ns += readl(ioaddr + PTP_STSR) * 1000000000ULL;
if (systime)
*systime = ns;
}
const struct stmmac_hwtimestamp stmmac_ptp = {
.config_hw_tstamping = config_hw_tstamping,
.init_systime = init_systime,
.config_sub_second_increment = config_sub_second_increment,
.config_addend = config_addend,
.adjust_systime = adjust_systime,
.get_systime = get_systime,
};
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