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net: stmmac: Move subsecond increment configuration in dedicated helper

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In preparation for fine/coarse support, let's move the subsecond increment
and addend configuration in a dedicated helper.

Signed-off-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Link: https://patch.msgid.link/20251024070720.71174-2-maxime.chevallier@bootlin.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Maxime Chevallier
2025-10-24 09:07:17 +02:00
committed by Paolo Abeni
parent d7d5eca4de
commit 792000fbcd
1 changed files with 28 additions and 20 deletions
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48
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
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@@ -464,6 +464,33 @@ static void stmmac_get_rx_hwtstamp(struct stmmac_priv *priv, struct dma_desc *p,
}
}
static void stmmac_update_subsecond_increment(struct stmmac_priv *priv)
{
bool xmac = dwmac_is_xmac(priv->plat->core_type);
u32 sec_inc = 0;
u64 temp = 0;
stmmac_config_hw_tstamping(priv, priv->ptpaddr, priv->systime_flags);
/* program Sub Second Increment reg */
stmmac_config_sub_second_increment(priv, priv->ptpaddr,
priv->plat->clk_ptp_rate,
xmac, &sec_inc);
temp = div_u64(1000000000ULL, sec_inc);
/* Store sub second increment for later use */
priv->sub_second_inc = sec_inc;
/* calculate default added value:
* formula is :
* addend = (2^32)/freq_div_ratio;
* where, freq_div_ratio = 1e9ns/sec_inc
*/
temp = (u64)(temp << 32);
priv->default_addend = div_u64(temp, priv->plat->clk_ptp_rate);
stmmac_config_addend(priv, priv->ptpaddr, priv->default_addend);
}
/**
* stmmac_hwtstamp_set - control hardware timestamping.
* @dev: device pointer.
@@ -697,10 +724,7 @@ static int stmmac_hwtstamp_get(struct net_device *dev,
static int stmmac_init_tstamp_counter(struct stmmac_priv *priv,
u32 systime_flags)
{
bool xmac = dwmac_is_xmac(priv->plat->core_type);
struct timespec64 now;
u32 sec_inc = 0;
u64 temp = 0;
if (!priv->plat->clk_ptp_rate) {
netdev_err(priv->dev, "Invalid PTP clock rate");
@@ -710,23 +734,7 @@ static int stmmac_init_tstamp_counter(struct stmmac_priv *priv,
stmmac_config_hw_tstamping(priv, priv->ptpaddr, systime_flags);
priv->systime_flags = systime_flags;
/* program Sub Second Increment reg */
stmmac_config_sub_second_increment(priv, priv->ptpaddr,
priv->plat->clk_ptp_rate,
xmac, &sec_inc);
temp = div_u64(1000000000ULL, sec_inc);
/* Store sub second increment for later use */
priv->sub_second_inc = sec_inc;
/* calculate default added value:
* formula is :
* addend = (2^32)/freq_div_ratio;
* where, freq_div_ratio = 1e9ns/sec_inc
*/
temp = (u64)(temp << 32);
priv->default_addend = div_u64(temp, priv->plat->clk_ptp_rate);
stmmac_config_addend(priv, priv->ptpaddr, priv->default_addend);
stmmac_update_subsecond_increment(priv);
/* initialize system time */
ktime_get_real_ts64(&now);