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OpenCloudOS-Kernel/drivers/net/dsa/sja1105/sja1105_ptp.c

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// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2019, Vladimir Oltean <olteanv@gmail.com>
*/
#include <linux/spi/spi.h>
#include "sja1105.h"
/* The adjfine API clamps ppb between [-32,768,000, 32,768,000], and
* therefore scaled_ppm between [-2,147,483,648, 2,147,483,647].
* Set the maximum supported ppb to a round value smaller than the maximum.
*
* Percentually speaking, this is a +/- 0.032x adjustment of the
* free-running counter (0.968x to 1.032x).
*/
#define SJA1105_MAX_ADJ_PPB 32000000
#define SJA1105_SIZE_PTP_CMD 4
/* PTPSYNCTS has no interrupt or update mechanism, because the intended
* hardware use case is for the timestamp to be collected synchronously,
* immediately after the CAS_MASTER SJA1105 switch has performed a CASSYNC
* one-shot toggle (no return to level) on the PTP_CLK pin. When used as a
* generic extts source, the PTPSYNCTS register needs polling and a comparison
* with the old value. The polling interval is configured as the Nyquist rate
* of a signal with 50% duty cycle and 1Hz frequency, which is sadly all that
* this hardware can do (but may be enough for some setups). Anything of higher
* frequency than 1 Hz will be lost, since there is no timestamp FIFO.
*/
#define SJA1105_EXTTS_INTERVAL (HZ / 6)
/* This range is actually +/- SJA1105_MAX_ADJ_PPB
* divided by 1000 (ppb -> ppm) and with a 16-bit
* "fractional" part (actually fixed point).
* |
* v
* Convert scaled_ppm from the +/- ((10^6) << 16) range
* into the +/- (1 << 31) range.
*
* This forgoes a "ppb" numeric representation (up to NSEC_PER_SEC)
* and defines the scaling factor between scaled_ppm and the actual
* frequency adjustments of the PHC.
*
* ptpclkrate = scaled_ppm * 2^31 / (10^6 * 2^16)
* simplifies to
* ptpclkrate = scaled_ppm * 2^9 / 5^6
*/
#define SJA1105_CC_MULT_NUM (1 << 9)
#define SJA1105_CC_MULT_DEM 15625
#define SJA1105_CC_MULT 0x80000000
enum sja1105_ptp_clk_mode {
PTP_ADD_MODE = 1,
PTP_SET_MODE = 0,
};
#define extts_to_data(t) \
container_of((t), struct sja1105_ptp_data, extts_timer)
#define ptp_caps_to_data(d) \
container_of((d), struct sja1105_ptp_data, caps)
#define ptp_data_to_sja1105(d) \
container_of((d), struct sja1105_private, ptp_data)
int sja1105_hwtstamp_set(struct dsa_switch *ds, int port, struct ifreq *ifr)
{
struct sja1105_private *priv = ds->priv;
struct hwtstamp_config config;
if (copy_from_user(&config, ifr->ifr_data, sizeof(config)))
return -EFAULT;
switch (config.tx_type) {
case HWTSTAMP_TX_OFF:
priv->hwts_tx_en &= ~BIT(port);
break;
case HWTSTAMP_TX_ON:
priv->hwts_tx_en |= BIT(port);
break;
default:
return -ERANGE;
}
switch (config.rx_filter) {
case HWTSTAMP_FILTER_NONE:
priv->hwts_rx_en &= ~BIT(port);
break;
default:
priv->hwts_rx_en |= BIT(port);
break;
}
if (copy_to_user(ifr->ifr_data, &config, sizeof(config)))
return -EFAULT;
return 0;
}
int sja1105_hwtstamp_get(struct dsa_switch *ds, int port, struct ifreq *ifr)
{
struct sja1105_private *priv = ds->priv;
struct hwtstamp_config config;
config.flags = 0;
if (priv->hwts_tx_en & BIT(port))
config.tx_type = HWTSTAMP_TX_ON;
else
config.tx_type = HWTSTAMP_TX_OFF;
if (priv->hwts_rx_en & BIT(port))
config.rx_filter = HWTSTAMP_FILTER_PTP_V2_L2_EVENT;
else
config.rx_filter = HWTSTAMP_FILTER_NONE;
return copy_to_user(ifr->ifr_data, &config, sizeof(config)) ?
-EFAULT : 0;
}
int sja1105_get_ts_info(struct dsa_switch *ds, int port,
struct ethtool_ts_info *info)
{
struct sja1105_private *priv = ds->priv;
struct sja1105_ptp_data *ptp_data = &priv->ptp_data;
/* Called during cleanup */
if (!ptp_data->clock)
return -ENODEV;
info->so_timestamping = SOF_TIMESTAMPING_TX_HARDWARE |
SOF_TIMESTAMPING_RX_HARDWARE |
SOF_TIMESTAMPING_RAW_HARDWARE;
info->tx_types = (1 << HWTSTAMP_TX_OFF) |
(1 << HWTSTAMP_TX_ON);
info->rx_filters = (1 << HWTSTAMP_FILTER_NONE) |
(1 << HWTSTAMP_FILTER_PTP_V2_L2_EVENT);
info->phc_index = ptp_clock_index(ptp_data->clock);
return 0;
}
void sja1105et_ptp_cmd_packing(u8 *buf, struct sja1105_ptp_cmd *cmd,
enum packing_op op)
{
const int size = SJA1105_SIZE_PTP_CMD;
/* No need to keep this as part of the structure */
u64 valid = 1;
sja1105_packing(buf, &valid, 31, 31, size, op);
sja1105_packing(buf, &cmd->ptpstrtsch, 30, 30, size, op);
sja1105_packing(buf, &cmd->ptpstopsch, 29, 29, size, op);
sja1105_packing(buf, &cmd->startptpcp, 28, 28, size, op);
sja1105_packing(buf, &cmd->stopptpcp, 27, 27, size, op);
sja1105_packing(buf, &cmd->resptp, 2, 2, size, op);
sja1105_packing(buf, &cmd->corrclk4ts, 1, 1, size, op);
sja1105_packing(buf, &cmd->ptpclkadd, 0, 0, size, op);
}
void sja1105pqrs_ptp_cmd_packing(u8 *buf, struct sja1105_ptp_cmd *cmd,
enum packing_op op)
{
const int size = SJA1105_SIZE_PTP_CMD;
/* No need to keep this as part of the structure */
u64 valid = 1;
sja1105_packing(buf, &valid, 31, 31, size, op);
sja1105_packing(buf, &cmd->ptpstrtsch, 30, 30, size, op);
sja1105_packing(buf, &cmd->ptpstopsch, 29, 29, size, op);
sja1105_packing(buf, &cmd->startptpcp, 28, 28, size, op);
sja1105_packing(buf, &cmd->stopptpcp, 27, 27, size, op);
sja1105_packing(buf, &cmd->resptp, 3, 3, size, op);
sja1105_packing(buf, &cmd->corrclk4ts, 2, 2, size, op);
sja1105_packing(buf, &cmd->ptpclkadd, 0, 0, size, op);
}
int sja1105_ptp_commit(struct dsa_switch *ds, struct sja1105_ptp_cmd *cmd,
sja1105_spi_rw_mode_t rw)
{
const struct sja1105_private *priv = ds->priv;
const struct sja1105_regs *regs = priv->info->regs;
u8 buf[SJA1105_SIZE_PTP_CMD] = {0};
int rc;
if (rw == SPI_WRITE)
priv->info->ptp_cmd_packing(buf, cmd, PACK);
rc = sja1105_xfer_buf(priv, rw, regs->ptp_control, buf,
SJA1105_SIZE_PTP_CMD);
if (rw == SPI_READ)
priv->info->ptp_cmd_packing(buf, cmd, UNPACK);
return rc;
}
/* The switch returns partial timestamps (24 bits for SJA1105 E/T, which wrap
* around in 0.135 seconds, and 32 bits for P/Q/R/S, wrapping around in 34.35
* seconds).
*
* This receives the RX or TX MAC timestamps, provided by hardware as
* the lower bits of the cycle counter, sampled at the time the timestamp was
* collected.
*
* To reconstruct into a full 64-bit-wide timestamp, the cycle counter is
* read and the high-order bits are filled in.
*
* Must be called within one wraparound period of the partial timestamp since
* it was generated by the MAC.
*/
static u64 sja1105_tstamp_reconstruct(struct dsa_switch *ds, u64 now,
u64 ts_partial)
{
struct sja1105_private *priv = ds->priv;
u64 partial_tstamp_mask = CYCLECOUNTER_MASK(priv->info->ptp_ts_bits);
u64 ts_reconstructed;
ts_reconstructed = (now & ~partial_tstamp_mask) | ts_partial;
/* Check lower bits of current cycle counter against the timestamp.
* If the current cycle counter is lower than the partial timestamp,
* then wraparound surely occurred and must be accounted for.
*/
if ((now & partial_tstamp_mask) <= ts_partial)
ts_reconstructed -= (partial_tstamp_mask + 1);
return ts_reconstructed;
}
/* Reads the SPI interface for an egress timestamp generated by the switch
* for frames sent using management routes.
*
* SJA1105 E/T layout of the 4-byte SPI payload:
*
* 31 23 15 7 0
* | | | | |
* +-----+-----+-----+ ^
* ^ |
* | |
* 24-bit timestamp Update bit
*
*
* SJA1105 P/Q/R/S layout of the 8-byte SPI payload:
*
* 31 23 15 7 0 63 55 47 39 32
* | | | | | | | | | |
* ^ +-----+-----+-----+-----+
* | ^
* | |
* Update bit 32-bit timestamp
*
* Notice that the update bit is in the same place.
* To have common code for E/T and P/Q/R/S for reading the timestamp,
* we need to juggle with the offset and the bit indices.
*/
static int sja1105_ptpegr_ts_poll(struct dsa_switch *ds, int port, u64 *ts)
{
struct sja1105_private *priv = ds->priv;
const struct sja1105_regs *regs = priv->info->regs;
int tstamp_bit_start, tstamp_bit_end;
int timeout = 10;
u8 packed_buf[8];
u64 update;
int rc;
do {
rc = sja1105_xfer_buf(priv, SPI_READ, regs->ptpegr_ts[port],
packed_buf, priv->info->ptpegr_ts_bytes);
if (rc < 0)
return rc;
sja1105_unpack(packed_buf, &update, 0, 0,
priv->info->ptpegr_ts_bytes);
if (update)
break;
usleep_range(10, 50);
} while (--timeout);
if (!timeout)
return -ETIMEDOUT;
/* Point the end bit to the second 32-bit word on P/Q/R/S,
* no-op on E/T.
*/
tstamp_bit_end = (priv->info->ptpegr_ts_bytes - 4) * 8;
/* Shift the 24-bit timestamp on E/T to be collected from 31:8.
* No-op on P/Q/R/S.
*/
tstamp_bit_end += 32 - priv->info->ptp_ts_bits;
tstamp_bit_start = tstamp_bit_end + priv->info->ptp_ts_bits - 1;
*ts = 0;
sja1105_unpack(packed_buf, ts, tstamp_bit_start, tstamp_bit_end,
priv->info->ptpegr_ts_bytes);
return 0;
}
/* Caller must hold ptp_data->lock */
static int sja1105_ptpclkval_read(struct sja1105_private *priv, u64 *ticks,
struct ptp_system_timestamp *ptp_sts)
{
const struct sja1105_regs *regs = priv->info->regs;
return sja1105_xfer_u64(priv, SPI_READ, regs->ptpclkval, ticks,
ptp_sts);
}
/* Caller must hold ptp_data->lock */
static int sja1105_ptpclkval_write(struct sja1105_private *priv, u64 ticks,
struct ptp_system_timestamp *ptp_sts)
{
const struct sja1105_regs *regs = priv->info->regs;
return sja1105_xfer_u64(priv, SPI_WRITE, regs->ptpclkval, &ticks,
ptp_sts);
}
static void sja1105_extts_poll(struct sja1105_private *priv)
{
struct sja1105_ptp_data *ptp_data = &priv->ptp_data;
const struct sja1105_regs *regs = priv->info->regs;
struct ptp_clock_event event;
u64 ptpsyncts = 0;
int rc;
rc = sja1105_xfer_u64(priv, SPI_READ, regs->ptpsyncts, &ptpsyncts,
NULL);
if (rc < 0)
dev_err_ratelimited(priv->ds->dev,
"Failed to read PTPSYNCTS: %d\n", rc);
if (ptpsyncts && ptp_data->ptpsyncts != ptpsyncts) {
event.index = 0;
event.type = PTP_CLOCK_EXTTS;
event.timestamp = ns_to_ktime(sja1105_ticks_to_ns(ptpsyncts));
ptp_clock_event(ptp_data->clock, &event);
ptp_data->ptpsyncts = ptpsyncts;
}
}
static long sja1105_rxtstamp_work(struct ptp_clock_info *ptp)
{
struct sja1105_ptp_data *ptp_data = ptp_caps_to_data(ptp);
struct sja1105_private *priv = ptp_data_to_sja1105(ptp_data);
struct dsa_switch *ds = priv->ds;
struct sk_buff *skb;
mutex_lock(&ptp_data->lock);
while ((skb = skb_dequeue(&ptp_data->skb_rxtstamp_queue)) != NULL) {
struct skb_shared_hwtstamps *shwt = skb_hwtstamps(skb);
u64 ticks, ts;
int rc;
rc = sja1105_ptpclkval_read(priv, &ticks, NULL);
if (rc < 0) {
dev_err(ds->dev, "Failed to read PTP clock: %d\n", rc);
kfree_skb(skb);
continue;
}
*shwt = (struct skb_shared_hwtstamps) {0};
ts = SJA1105_SKB_CB(skb)->tstamp;
ts = sja1105_tstamp_reconstruct(ds, ticks, ts);
shwt->hwtstamp = ns_to_ktime(sja1105_ticks_to_ns(ts));
netif_rx(skb);
}
if (ptp_data->extts_enabled)
sja1105_extts_poll(priv);
mutex_unlock(&ptp_data->lock);
/* Don't restart */
return -1;
}
bool sja1105_rxtstamp(struct dsa_switch *ds, int port, struct sk_buff *skb)
{
struct sja1105_private *priv = ds->priv;
struct sja1105_ptp_data *ptp_data = &priv->ptp_data;
if (!(priv->hwts_rx_en & BIT(port)))
return false;
/* We need to read the full PTP clock to reconstruct the Rx
* timestamp. For that we need a sleepable context.
*/
skb_queue_tail(&ptp_data->skb_rxtstamp_queue, skb);
ptp_schedule_worker(ptp_data->clock, 0);
return true;
}
bool sja1110_rxtstamp(struct dsa_switch *ds, int port, struct sk_buff *skb)
{
struct skb_shared_hwtstamps *shwt = skb_hwtstamps(skb);
u64 ts = SJA1105_SKB_CB(skb)->tstamp;
*shwt = (struct skb_shared_hwtstamps) {0};
shwt->hwtstamp = ns_to_ktime(sja1105_ticks_to_ns(ts));
/* Don't defer */
return false;
}
/* Called from dsa_skb_defer_rx_timestamp */
bool sja1105_port_rxtstamp(struct dsa_switch *ds, int port,
struct sk_buff *skb, unsigned int type)
{
struct sja1105_private *priv = ds->priv;
return priv->info->rxtstamp(ds, port, skb);
}
void sja1110_process_meta_tstamp(struct dsa_switch *ds, int port, u8 ts_id,
enum sja1110_meta_tstamp dir, u64 tstamp)
{
struct sja1105_private *priv = ds->priv;
struct sja1105_ptp_data *ptp_data = &priv->ptp_data;
struct sk_buff *skb, *skb_tmp, *skb_match = NULL;
struct skb_shared_hwtstamps shwt = {0};
/* We don't care about RX timestamps on the CPU port */
if (dir == SJA1110_META_TSTAMP_RX)
return;
spin_lock(&ptp_data->skb_txtstamp_queue.lock);
skb_queue_walk_safe(&ptp_data->skb_txtstamp_queue, skb, skb_tmp) {
if (SJA1105_SKB_CB(skb)->ts_id != ts_id)
continue;
__skb_unlink(skb, &ptp_data->skb_txtstamp_queue);
skb_match = skb;
break;
}
spin_unlock(&ptp_data->skb_txtstamp_queue.lock);
if (WARN_ON(!skb_match))
return;
shwt.hwtstamp = ns_to_ktime(sja1105_ticks_to_ns(tstamp));
skb_complete_tx_timestamp(skb_match, &shwt);
}
/* In addition to cloning the skb which is done by the common
* sja1105_port_txtstamp, we need to generate a timestamp ID and save the
* packet to the TX timestamping queue.
*/
void sja1110_txtstamp(struct dsa_switch *ds, int port, struct sk_buff *skb)
{
struct sk_buff *clone = SJA1105_SKB_CB(skb)->clone;
struct sja1105_private *priv = ds->priv;
struct sja1105_ptp_data *ptp_data = &priv->ptp_data;
u8 ts_id;
skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS;
spin_lock(&priv->ts_id_lock);
ts_id = priv->ts_id;
/* Deal automatically with 8-bit wraparound */
priv->ts_id++;
SJA1105_SKB_CB(clone)->ts_id = ts_id;
spin_unlock(&priv->ts_id_lock);
skb_queue_tail(&ptp_data->skb_txtstamp_queue, clone);
}
/* Called from dsa_skb_tx_timestamp. This callback is just to clone
* the skb and have it available in SJA1105_SKB_CB in the .port_deferred_xmit
* callback, where we will timestamp it synchronously.
*/
void sja1105_port_txtstamp(struct dsa_switch *ds, int port, struct sk_buff *skb)
{
struct sja1105_private *priv = ds->priv;
struct sk_buff *clone;
if (!(priv->hwts_tx_en & BIT(port)))
return;
clone = skb_clone_sk(skb);
if (!clone)
return;
SJA1105_SKB_CB(skb)->clone = clone;
if (priv->info->txtstamp)
priv->info->txtstamp(ds, port, skb);
}
static int sja1105_ptp_reset(struct dsa_switch *ds)
{
struct sja1105_private *priv = ds->priv;
struct sja1105_ptp_data *ptp_data = &priv->ptp_data;
struct sja1105_ptp_cmd cmd = ptp_data->cmd;
int rc;
mutex_lock(&ptp_data->lock);
cmd.resptp = 1;
dev_dbg(ds->dev, "Resetting PTP clock\n");
rc = sja1105_ptp_commit(ds, &cmd, SPI_WRITE);
sja1105_tas_clockstep(priv->ds);
mutex_unlock(&ptp_data->lock);
return rc;
}
/* Caller must hold ptp_data->lock */
int __sja1105_ptp_gettimex(struct dsa_switch *ds, u64 *ns,
struct ptp_system_timestamp *ptp_sts)
{
struct sja1105_private *priv = ds->priv;
u64 ticks;
int rc;
rc = sja1105_ptpclkval_read(priv, &ticks, ptp_sts);
if (rc < 0) {
dev_err(ds->dev, "Failed to read PTP clock: %d\n", rc);
return rc;
}
*ns = sja1105_ticks_to_ns(ticks);
return 0;
}
static int sja1105_ptp_gettimex(struct ptp_clock_info *ptp,
struct timespec64 *ts,
struct ptp_system_timestamp *ptp_sts)
{
struct sja1105_ptp_data *ptp_data = ptp_caps_to_data(ptp);
struct sja1105_private *priv = ptp_data_to_sja1105(ptp_data);
u64 now = 0;
int rc;
mutex_lock(&ptp_data->lock);
rc = __sja1105_ptp_gettimex(priv->ds, &now, ptp_sts);
*ts = ns_to_timespec64(now);
mutex_unlock(&ptp_data->lock);
return rc;
}
/* Caller must hold ptp_data->lock */
static int sja1105_ptp_mode_set(struct sja1105_private *priv,
enum sja1105_ptp_clk_mode mode)
{
struct sja1105_ptp_data *ptp_data = &priv->ptp_data;
if (ptp_data->cmd.ptpclkadd == mode)
return 0;
ptp_data->cmd.ptpclkadd = mode;
return sja1105_ptp_commit(priv->ds, &ptp_data->cmd, SPI_WRITE);
}
/* Write to PTPCLKVAL while PTPCLKADD is 0 */
int __sja1105_ptp_settime(struct dsa_switch *ds, u64 ns,
struct ptp_system_timestamp *ptp_sts)
{
struct sja1105_private *priv = ds->priv;
u64 ticks = ns_to_sja1105_ticks(ns);
int rc;
rc = sja1105_ptp_mode_set(priv, PTP_SET_MODE);
if (rc < 0) {
dev_err(priv->ds->dev, "Failed to put PTPCLK in set mode\n");
return rc;
}
rc = sja1105_ptpclkval_write(priv, ticks, ptp_sts);
sja1105_tas_clockstep(priv->ds);
return rc;
}
static int sja1105_ptp_settime(struct ptp_clock_info *ptp,
const struct timespec64 *ts)
{
struct sja1105_ptp_data *ptp_data = ptp_caps_to_data(ptp);
struct sja1105_private *priv = ptp_data_to_sja1105(ptp_data);
u64 ns = timespec64_to_ns(ts);
int rc;
mutex_lock(&ptp_data->lock);
rc = __sja1105_ptp_settime(priv->ds, ns, NULL);
mutex_unlock(&ptp_data->lock);
return rc;
}
static int sja1105_ptp_adjfine(struct ptp_clock_info *ptp, long scaled_ppm)
{
struct sja1105_ptp_data *ptp_data = ptp_caps_to_data(ptp);
struct sja1105_private *priv = ptp_data_to_sja1105(ptp_data);
const struct sja1105_regs *regs = priv->info->regs;
u32 clkrate32;
s64 clkrate;
int rc;
clkrate = (s64)scaled_ppm * SJA1105_CC_MULT_NUM;
clkrate = div_s64(clkrate, SJA1105_CC_MULT_DEM);
/* Take a +/- value and re-center it around 2^31. */
clkrate = SJA1105_CC_MULT + clkrate;
WARN_ON(abs(clkrate) >= GENMASK_ULL(31, 0));
clkrate32 = clkrate;
mutex_lock(&ptp_data->lock);
rc = sja1105_xfer_u32(priv, SPI_WRITE, regs->ptpclkrate, &clkrate32,
NULL);
sja1105_tas_adjfreq(priv->ds);
mutex_unlock(&ptp_data->lock);
return rc;
}
/* Write to PTPCLKVAL while PTPCLKADD is 1 */
int __sja1105_ptp_adjtime(struct dsa_switch *ds, s64 delta)
{
struct sja1105_private *priv = ds->priv;
s64 ticks = ns_to_sja1105_ticks(delta);
int rc;
rc = sja1105_ptp_mode_set(priv, PTP_ADD_MODE);
if (rc < 0) {
dev_err(priv->ds->dev, "Failed to put PTPCLK in add mode\n");
return rc;
}
rc = sja1105_ptpclkval_write(priv, ticks, NULL);
sja1105_tas_clockstep(priv->ds);
return rc;
}
static int sja1105_ptp_adjtime(struct ptp_clock_info *ptp, s64 delta)
{
struct sja1105_ptp_data *ptp_data = ptp_caps_to_data(ptp);
struct sja1105_private *priv = ptp_data_to_sja1105(ptp_data);
int rc;
mutex_lock(&ptp_data->lock);
rc = __sja1105_ptp_adjtime(priv->ds, delta);
mutex_unlock(&ptp_data->lock);
return rc;
}
static void sja1105_ptp_extts_setup_timer(struct sja1105_ptp_data *ptp_data)
{
unsigned long expires = ((jiffies / SJA1105_EXTTS_INTERVAL) + 1) *
SJA1105_EXTTS_INTERVAL;
mod_timer(&ptp_data->extts_timer, expires);
}
static void sja1105_ptp_extts_timer(struct timer_list *t)
{
struct sja1105_ptp_data *ptp_data = extts_to_data(t);
ptp_schedule_worker(ptp_data->clock, 0);
sja1105_ptp_extts_setup_timer(ptp_data);
}
static int sja1105_change_ptp_clk_pin_func(struct sja1105_private *priv,
enum ptp_pin_function func)
{
struct sja1105_avb_params_entry *avb;
enum ptp_pin_function old_func;
avb = priv->static_config.tables[BLK_IDX_AVB_PARAMS].entries;
if (priv->info->device_id == SJA1105E_DEVICE_ID ||
priv->info->device_id == SJA1105T_DEVICE_ID ||
avb->cas_master)
old_func = PTP_PF_PEROUT;
else
old_func = PTP_PF_EXTTS;
if (func == old_func)
return 0;
avb->cas_master = (func == PTP_PF_PEROUT);
return sja1105_dynamic_config_write(priv, BLK_IDX_AVB_PARAMS, 0, avb,
true);
}
/* The PTP_CLK pin may be configured to toggle with a 50% duty cycle and a
* frequency f:
*
* NSEC_PER_SEC
* f = ----------------------
* (PTPPINDUR * 8 ns) * 2
*/
static int sja1105_per_out_enable(struct sja1105_private *priv,
struct ptp_perout_request *perout,
bool on)
{
struct sja1105_ptp_data *ptp_data = &priv->ptp_data;
const struct sja1105_regs *regs = priv->info->regs;
struct sja1105_ptp_cmd cmd = ptp_data->cmd;
int rc;
/* We only support one channel */
if (perout->index != 0)
return -EOPNOTSUPP;
/* Reject requests with unsupported flags */
if (perout->flags)
return -EOPNOTSUPP;
mutex_lock(&ptp_data->lock);
rc = sja1105_change_ptp_clk_pin_func(priv, PTP_PF_PEROUT);
if (rc)
goto out;
if (on) {
struct timespec64 pin_duration_ts = {
.tv_sec = perout->period.sec,
.tv_nsec = perout->period.nsec,
};
struct timespec64 pin_start_ts = {
.tv_sec = perout->start.sec,
.tv_nsec = perout->start.nsec,
};
u64 pin_duration = timespec64_to_ns(&pin_duration_ts);
u64 pin_start = timespec64_to_ns(&pin_start_ts);
u32 pin_duration32;
u64 now;
/* ptppindur: 32 bit register which holds the interval between
* 2 edges on PTP_CLK. So check for truncation which happens
* at periods larger than around 68.7 seconds.
*/
pin_duration = ns_to_sja1105_ticks(pin_duration / 2);
if (pin_duration > U32_MAX) {
rc = -ERANGE;
goto out;
}
pin_duration32 = pin_duration;
/* ptppins: 64 bit register which needs to hold a PTP time
* larger than the current time, otherwise the startptpcp
* command won't do anything. So advance the current time
* by a number of periods in a way that won't alter the
* phase offset.
*/
rc = __sja1105_ptp_gettimex(priv->ds, &now, NULL);
if (rc < 0)
goto out;
pin_start = future_base_time(pin_start, pin_duration,
now + 1ull * NSEC_PER_SEC);
pin_start = ns_to_sja1105_ticks(pin_start);
rc = sja1105_xfer_u64(priv, SPI_WRITE, regs->ptppinst,
&pin_start, NULL);
if (rc < 0)
goto out;
rc = sja1105_xfer_u32(priv, SPI_WRITE, regs->ptppindur,
&pin_duration32, NULL);
if (rc < 0)
goto out;
}
if (on)
cmd.startptpcp = true;
else
cmd.stopptpcp = true;
rc = sja1105_ptp_commit(priv->ds, &cmd, SPI_WRITE);
out:
mutex_unlock(&ptp_data->lock);
return rc;
}
static int sja1105_extts_enable(struct sja1105_private *priv,
struct ptp_extts_request *extts,
bool on)
{
int rc;
/* We only support one channel */
if (extts->index != 0)
return -EOPNOTSUPP;
/* Reject requests with unsupported flags */
if (extts->flags & ~(PTP_ENABLE_FEATURE |
PTP_RISING_EDGE |
PTP_FALLING_EDGE |
PTP_STRICT_FLAGS))
return -EOPNOTSUPP;
/* We can only enable time stamping on both edges, sadly. */
if ((extts->flags & PTP_STRICT_FLAGS) &&
(extts->flags & PTP_ENABLE_FEATURE) &&
(extts->flags & PTP_EXTTS_EDGES) != PTP_EXTTS_EDGES)
return -EOPNOTSUPP;
rc = sja1105_change_ptp_clk_pin_func(priv, PTP_PF_EXTTS);
if (rc)
return rc;
priv->ptp_data.extts_enabled = on;
if (on)
sja1105_ptp_extts_setup_timer(&priv->ptp_data);
else
del_timer_sync(&priv->ptp_data.extts_timer);
return 0;
}
static int sja1105_ptp_enable(struct ptp_clock_info *ptp,
struct ptp_clock_request *req, int on)
{
struct sja1105_ptp_data *ptp_data = ptp_caps_to_data(ptp);
struct sja1105_private *priv = ptp_data_to_sja1105(ptp_data);
int rc = -EOPNOTSUPP;
if (req->type == PTP_CLK_REQ_PEROUT)
rc = sja1105_per_out_enable(priv, &req->perout, on);
else if (req->type == PTP_CLK_REQ_EXTTS)
rc = sja1105_extts_enable(priv, &req->extts, on);
return rc;
}
static int sja1105_ptp_verify_pin(struct ptp_clock_info *ptp, unsigned int pin,
enum ptp_pin_function func, unsigned int chan)
{
struct sja1105_ptp_data *ptp_data = ptp_caps_to_data(ptp);
struct sja1105_private *priv = ptp_data_to_sja1105(ptp_data);
if (chan != 0 || pin != 0)
return -1;
switch (func) {
case PTP_PF_NONE:
case PTP_PF_PEROUT:
break;
case PTP_PF_EXTTS:
if (priv->info->device_id == SJA1105E_DEVICE_ID ||
priv->info->device_id == SJA1105T_DEVICE_ID)
return -1;
break;
default:
return -1;
}
return 0;
}
static struct ptp_pin_desc sja1105_ptp_pin = {
.name = "ptp_clk",
.index = 0,
.func = PTP_PF_NONE,
};
int sja1105_ptp_clock_register(struct dsa_switch *ds)
{
struct sja1105_private *priv = ds->priv;
struct sja1105_ptp_data *ptp_data = &priv->ptp_data;
ptp_data->caps = (struct ptp_clock_info) {
.owner = THIS_MODULE,
.name = "SJA1105 PHC",
.adjfine = sja1105_ptp_adjfine,
.adjtime = sja1105_ptp_adjtime,
.gettimex64 = sja1105_ptp_gettimex,
.settime64 = sja1105_ptp_settime,
.enable = sja1105_ptp_enable,
.verify = sja1105_ptp_verify_pin,
.do_aux_work = sja1105_rxtstamp_work,
.max_adj = SJA1105_MAX_ADJ_PPB,
.pin_config = &sja1105_ptp_pin,
.n_pins = 1,
.n_ext_ts = 1,
.n_per_out = 1,
};
/* Only used on SJA1105 */
skb_queue_head_init(&ptp_data->skb_rxtstamp_queue);
/* Only used on SJA1110 */
skb_queue_head_init(&ptp_data->skb_txtstamp_queue);
ptp_data->clock = ptp_clock_register(&ptp_data->caps, ds->dev);
if (IS_ERR_OR_NULL(ptp_data->clock))
return PTR_ERR(ptp_data->clock);
ptp_data->cmd.corrclk4ts = true;
ptp_data->cmd.ptpclkadd = PTP_SET_MODE;
timer_setup(&ptp_data->extts_timer, sja1105_ptp_extts_timer, 0);
return sja1105_ptp_reset(ds);
}
void sja1105_ptp_clock_unregister(struct dsa_switch *ds)
{
struct sja1105_private *priv = ds->priv;
struct sja1105_ptp_data *ptp_data = &priv->ptp_data;
if (IS_ERR_OR_NULL(ptp_data->clock))
return;
del_timer_sync(&ptp_data->extts_timer);
ptp_cancel_worker_sync(ptp_data->clock);
skb_queue_purge(&ptp_data->skb_txtstamp_queue);
skb_queue_purge(&ptp_data->skb_rxtstamp_queue);
ptp_clock_unregister(ptp_data->clock);
ptp_data->clock = NULL;
}
void sja1105_ptp_txtstamp_skb(struct dsa_switch *ds, int port,
struct sk_buff *skb)
{
struct sja1105_private *priv = ds->priv;
struct sja1105_ptp_data *ptp_data = &priv->ptp_data;
struct skb_shared_hwtstamps shwt = {0};
u64 ticks, ts;
int rc;
skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS;
mutex_lock(&ptp_data->lock);
rc = sja1105_ptpegr_ts_poll(ds, port, &ts);
if (rc < 0) {
dev_err(ds->dev, "timed out polling for tstamp\n");
kfree_skb(skb);
goto out;
}
rc = sja1105_ptpclkval_read(priv, &ticks, NULL);
if (rc < 0) {
dev_err(ds->dev, "Failed to read PTP clock: %d\n", rc);
kfree_skb(skb);
goto out;
}
ts = sja1105_tstamp_reconstruct(ds, ticks, ts);
shwt.hwtstamp = ns_to_ktime(sja1105_ticks_to_ns(ts));
skb_complete_tx_timestamp(skb, &shwt);
out:
mutex_unlock(&ptp_data->lock);
}
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