// SPDX-License-Identifier: GPL-2.0-only /**************************************************************************** * Driver for Solarflare network controllers and boards * Copyright 2006-2011 Solarflare Communications Inc.
*/ /* * Useful functions for working with MDIO clause 45 PHYs
*/ #include <linux/types.h> #include <linux/ethtool.h> #include <linux/delay.h> #include"net_driver.h" #include"mdio_10g.h" #include"workarounds.h"
unsigned ef4_mdio_id_oui(u32 id)
{ unsigned oui = 0; int i;
/* The bits of the OUI are designated a..x, with a=0 and b variable. * In the id register c is the MSB but the OUI is conventionally
* written as bytes h..a, p..i, x..q. Reorder the bits accordingly. */ for (i = 0; i < 22; ++i) if (id & (1 << (i + 10)))
oui |= 1 << (i ^ 7);
return oui;
}
int ef4_mdio_reset_mmd(struct ef4_nic *port, int mmd, int spins, int spintime)
{
u32 ctrl;
/* Catch callers passing values in the wrong units (or just silly) */
EF4_BUG_ON_PARANOID(spins * spintime >= 5000);
ef4_mdio_write(port, mmd, MDIO_CTRL1, MDIO_CTRL1_RESET); /* Wait for the reset bit to clear. */ do {
msleep(spintime);
ctrl = ef4_mdio_read(port, mmd, MDIO_CTRL1);
spins--;
} while (spins && (ctrl & MDIO_CTRL1_RESET));
return spins ? spins : -ETIMEDOUT;
}
staticint ef4_mdio_check_mmd(struct ef4_nic *efx, int mmd)
{ int status;
if (mmd != MDIO_MMD_AN) { /* Read MMD STATUS2 to check it is responding. */
status = ef4_mdio_read(efx, mmd, MDIO_STAT2); if ((status & MDIO_STAT2_DEVPRST) != MDIO_STAT2_DEVPRST_VAL) {
netif_err(efx, hw, efx->net_dev, "PHY MMD %d not responding.\n", mmd); return -EIO;
}
}
return 0;
}
/* This ought to be ridiculous overkill. We expect it to fail rarely */ #define MDIO45_RESET_TIME 1000 /* ms */ #define MDIO45_RESET_ITERS 100
int ef4_mdio_wait_reset_mmds(struct ef4_nic *efx, unsignedint mmd_mask)
{ constint spintime = MDIO45_RESET_TIME / MDIO45_RESET_ITERS; int tries = MDIO45_RESET_ITERS; int rc = 0; int in_reset;
while (tries) { int mask = mmd_mask; int mmd = 0; int stat;
in_reset = 0; while (mask) { if (mask & 1) {
stat = ef4_mdio_read(efx, mmd, MDIO_CTRL1); if (stat < 0) {
netif_err(efx, hw, efx->net_dev, "failed to read status of" " MMD %d\n", mmd); return -EIO;
} if (stat & MDIO_CTRL1_RESET)
in_reset |= (1 << mmd);
}
mask = mask >> 1;
mmd++;
} if (!in_reset) break;
tries--;
msleep(spintime);
} if (in_reset != 0) {
netif_err(efx, hw, efx->net_dev, "not all MMDs came out of reset in time." " MMDs still in reset: %x\n", in_reset);
rc = -ETIMEDOUT;
} return rc;
}
int ef4_mdio_check_mmds(struct ef4_nic *efx, unsignedint mmd_mask)
{ int mmd = 0, probe_mmd, devs1, devs2;
u32 devices;
/* Historically we have probed the PHYXS to find out what devices are * present,but that doesn't work so well if the PHYXS isn't expected
* to exist, if so just find the first item in the list supplied. */
probe_mmd = (mmd_mask & MDIO_DEVS_PHYXS) ? MDIO_MMD_PHYXS :
__ffs(mmd_mask);
/** * ef4_mdio_an_reconfigure - Push advertising flags and restart autonegotiation * @efx: Efx NIC
*/ void ef4_mdio_an_reconfigure(struct ef4_nic *efx)
{ int reg;
WARN_ON(!(efx->mdio.mmds & MDIO_DEVS_AN));
/* Set up the base page */
reg = ADVERTISE_CSMA | ADVERTISE_RESV; if (efx->link_advertising & ADVERTISED_Pause)
reg |= ADVERTISE_PAUSE_CAP; if (efx->link_advertising & ADVERTISED_Asym_Pause)
reg |= ADVERTISE_PAUSE_ASYM;
ef4_mdio_write(efx, MDIO_MMD_AN, MDIO_AN_ADVERTISE, reg);
/* Set up the (extended) next page */
efx->phy_op->set_npage_adv(efx, efx->link_advertising);
Die Informationen auf dieser Webseite wurden
nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit,
noch Qualität der bereit gestellten Informationen zugesichert.
Bemerkung:
Die farbliche Syntaxdarstellung und die Messung sind noch experimentell.