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// SPDX-License-Identifier: GPL-2.0
/* Copyright (C) 2021 Gerhard Engleder <gerhard@engleder-embedded.com> */
#include "tsnep.h"
void tsnep_get_system_time(struct tsnep_adapter *adapter, u64 *time)
{
u32 high_before;
u32 low;
u32 high;
/* read high dword twice to detect overrun */
high = ioread32(adapter->addr + ECM_SYSTEM_TIME_HIGH);
do {
low = ioread32(adapter->addr + ECM_SYSTEM_TIME_LOW);
high_before = high;
high = ioread32(adapter->addr + ECM_SYSTEM_TIME_HIGH);
} while (high != high_before);
*time = (((u64)high) << 32) | ((u64)low);
}
int tsnep_ptp_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
{
struct tsnep_adapter *adapter = netdev_priv(netdev);
struct hwtstamp_config config;
if (!ifr)
return -EINVAL;
if (cmd == SIOCSHWTSTAMP) {
if (copy_from_user(&config, ifr->ifr_data, sizeof(config)))
return -EFAULT;
switch (config.tx_type) {
case HWTSTAMP_TX_OFF:
case HWTSTAMP_TX_ON:
break;
default:
return -ERANGE;
}
switch (config.rx_filter) {
case HWTSTAMP_FILTER_NONE:
break;
case HWTSTAMP_FILTER_ALL:
case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
case HWTSTAMP_FILTER_PTP_V2_EVENT:
case HWTSTAMP_FILTER_PTP_V2_SYNC:
case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
case HWTSTAMP_FILTER_NTP_ALL:
config.rx_filter = HWTSTAMP_FILTER_ALL;
break;
default:
return -ERANGE;
}
memcpy(&adapter->hwtstamp_config, &config,
sizeof(adapter->hwtstamp_config));
}
if (copy_to_user(ifr->ifr_data, &adapter->hwtstamp_config,
sizeof(adapter->hwtstamp_config)))
return -EFAULT;
return 0;
}
static int tsnep_ptp_adjfine(struct ptp_clock_info *ptp, long scaled_ppm)
{
struct tsnep_adapter *adapter = container_of(ptp, struct tsnep_adapter,
ptp_clock_info);
bool negative = false;
u64 rate_offset;
if (scaled_ppm < 0) {
scaled_ppm = -scaled_ppm;
negative = true;
}
/* convert from 16 bit to 32 bit binary fractional, divide by 1000000 to
* eliminate ppm, multiply with 8 to compensate 8ns clock cycle time,
* simplify calculation because 15625 * 8 = 1000000 / 8
*/
rate_offset = scaled_ppm;
rate_offset <<= 16 - 3;
rate_offset = div_u64(rate_offset, 15625);
rate_offset &= ECM_CLOCK_RATE_OFFSET_MASK;
if (negative)
rate_offset |= ECM_CLOCK_RATE_OFFSET_SIGN;
iowrite32(rate_offset & 0xFFFFFFFF, adapter->addr + ECM_CLOCK_RATE);
return 0;
}
static int tsnep_ptp_adjtime(struct ptp_clock_info *ptp, s64 delta)
{
struct tsnep_adapter *adapter = container_of(ptp, struct tsnep_adapter,
ptp_clock_info);
u64 system_time;
unsigned long flags;
spin_lock_irqsave(&adapter->ptp_lock, flags);
tsnep_get_system_time(adapter, &system_time);
system_time += delta;
/* high dword is buffered in hardware and synchronously written to
* system time when low dword is written
*/
iowrite32(system_time >> 32, adapter->addr + ECM_SYSTEM_TIME_HIGH);
iowrite32(system_time & 0xFFFFFFFF,
adapter->addr + ECM_SYSTEM_TIME_LOW);
spin_unlock_irqrestore(&adapter->ptp_lock, flags);
return 0;
}
static int tsnep_ptp_gettimex64(struct ptp_clock_info *ptp,
struct timespec64 *ts,
struct ptp_system_timestamp *sts)
{
struct tsnep_adapter *adapter = container_of(ptp, struct tsnep_adapter,
ptp_clock_info);
u32 high_before;
u32 low;
u32 high;
u64 system_time;
/* read high dword twice to detect overrun */
high = ioread32(adapter->addr + ECM_SYSTEM_TIME_HIGH);
do {
ptp_read_system_prets(sts);
low = ioread32(adapter->addr + ECM_SYSTEM_TIME_LOW);
ptp_read_system_postts(sts);
high_before = high;
high = ioread32(adapter->addr + ECM_SYSTEM_TIME_HIGH);
} while (high != high_before);
system_time = (((u64)high) << 32) | ((u64)low);
*ts = ns_to_timespec64(system_time);
return 0;
}
static int tsnep_ptp_settime64(struct ptp_clock_info *ptp,
const struct timespec64 *ts)
{
struct tsnep_adapter *adapter = container_of(ptp, struct tsnep_adapter,
ptp_clock_info);
u64 system_time = timespec64_to_ns(ts);
unsigned long flags;
spin_lock_irqsave(&adapter->ptp_lock, flags);
/* high dword is buffered in hardware and synchronously written to
* system time when low dword is written
*/
iowrite32(system_time >> 32, adapter->addr + ECM_SYSTEM_TIME_HIGH);
iowrite32(system_time & 0xFFFFFFFF,
adapter->addr + ECM_SYSTEM_TIME_LOW);
spin_unlock_irqrestore(&adapter->ptp_lock, flags);
return 0;
}
int tsnep_ptp_init(struct tsnep_adapter *adapter)
{
int retval = 0;
adapter->hwtstamp_config.rx_filter = HWTSTAMP_FILTER_NONE;
adapter->hwtstamp_config.tx_type = HWTSTAMP_TX_OFF;
snprintf(adapter->ptp_clock_info.name, 16, "%s", TSNEP);
adapter->ptp_clock_info.owner = THIS_MODULE;
/* at most 2^-1ns adjustment every clock cycle for 8ns clock cycle time,
* stay slightly below because only bits below 2^-1ns are supported
*/
adapter->ptp_clock_info.max_adj = (500000000 / 8 - 1);
adapter->ptp_clock_info.adjfine = tsnep_ptp_adjfine;
adapter->ptp_clock_info.adjtime = tsnep_ptp_adjtime;
adapter->ptp_clock_info.gettimex64 = tsnep_ptp_gettimex64;
adapter->ptp_clock_info.settime64 = tsnep_ptp_settime64;
spin_lock_init(&adapter->ptp_lock);
adapter->ptp_clock = ptp_clock_register(&adapter->ptp_clock_info,
&adapter->pdev->dev);
if (IS_ERR(adapter->ptp_clock)) {
netdev_err(adapter->netdev, "ptp_clock_register failed\n");
retval = PTR_ERR(adapter->ptp_clock);
adapter->ptp_clock = NULL;
} else if (adapter->ptp_clock) {
netdev_info(adapter->netdev, "PHC added\n");
}
return retval;
}
void tsnep_ptp_cleanup(struct tsnep_adapter *adapter)
{
if (adapter->ptp_clock) {
ptp_clock_unregister(adapter->ptp_clock);
netdev_info(adapter->netdev, "PHC removed\n");
}
}
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