drivers/net/mdio.c

Source file repositories/reference/linux-study-clean/drivers/net/mdio.c

File Facts

System
Linux kernel
Corpus path
drivers/net/mdio.c
Extension
.c
Size
12232 bytes
Lines
427
Domain
Driver Families
Bucket
drivers/net
Inferred role
Driver Families: exported/initcall integration point
Status
integration implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

if (mmd_mask & (1 << devad)) {
			mmd_mask &= ~(1 << devad);

			/* Reset the latched status and fault flags */
			mdio->mdio_read(mdio->dev, mdio->prtad,
					devad, MDIO_STAT1);
			if (devad == MDIO_MMD_PMAPMD || devad == MDIO_MMD_PCS ||
			    devad == MDIO_MMD_PHYXS || devad == MDIO_MMD_DTEXS)
				mdio->mdio_read(mdio->dev, mdio->prtad,
						devad, MDIO_STAT2);

			/* Check the current status and fault flags */
			reg = mdio->mdio_read(mdio->dev, mdio->prtad,
					      devad, MDIO_STAT1);
			if (reg < 0 ||
			    (reg & (MDIO_STAT1_FAULT | MDIO_STAT1_LSTATUS)) !=
			    MDIO_STAT1_LSTATUS)
				return false;
		}
	}

	return true;
}
EXPORT_SYMBOL(mdio45_links_ok);

/**
 * mdio45_nway_restart - restart auto-negotiation for this interface
 * @mdio: MDIO interface
 *
 * Returns 0 on success, negative on error.
 */
int mdio45_nway_restart(const struct mdio_if_info *mdio)
{
	if (!(mdio->mmds & MDIO_DEVS_AN))
		return -EOPNOTSUPP;

	mdio_set_flag(mdio, mdio->prtad, MDIO_MMD_AN, MDIO_CTRL1,
		      MDIO_AN_CTRL1_RESTART, true);
	return 0;
}
EXPORT_SYMBOL(mdio45_nway_restart);

static u32 mdio45_get_an(const struct mdio_if_info *mdio, u16 addr)
{
	u32 result = 0;
	int reg;

	reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_AN, addr);
	if (reg & ADVERTISE_10HALF)
		result |= ADVERTISED_10baseT_Half;
	if (reg & ADVERTISE_10FULL)
		result |= ADVERTISED_10baseT_Full;
	if (reg & ADVERTISE_100HALF)
		result |= ADVERTISED_100baseT_Half;
	if (reg & ADVERTISE_100FULL)
		result |= ADVERTISED_100baseT_Full;
	if (reg & ADVERTISE_PAUSE_CAP)
		result |= ADVERTISED_Pause;
	if (reg & ADVERTISE_PAUSE_ASYM)
		result |= ADVERTISED_Asym_Pause;
	return result;
}

/**
 * mdio45_ethtool_ksettings_get_npage - get settings for ETHTOOL_GLINKSETTINGS
 * @mdio: MDIO interface
 * @cmd: Ethtool request structure
 * @npage_adv: Modes currently advertised on next pages
 * @npage_lpa: Modes advertised by link partner on next pages
 *
 * The @cmd parameter is expected to have been cleared before calling
 * mdio45_ethtool_ksettings_get_npage().
 *
 * Since the CSRs for auto-negotiation using next pages are not fully
 * standardised, this function does not attempt to decode them.  The
 * caller must pass them in.
 */
void mdio45_ethtool_ksettings_get_npage(const struct mdio_if_info *mdio,
					struct ethtool_link_ksettings *cmd,
					u32 npage_adv, u32 npage_lpa)
{
	int reg;
	u32 speed, supported = 0, advertising = 0, lp_advertising = 0;

	BUILD_BUG_ON(MDIO_SUPPORTS_C22 != ETH_MDIO_SUPPORTS_C22);
	BUILD_BUG_ON(MDIO_SUPPORTS_C45 != ETH_MDIO_SUPPORTS_C45);

	cmd->base.phy_address = mdio->prtad;
	cmd->base.mdio_support =
		mdio->mode_support & (MDIO_SUPPORTS_C45 | MDIO_SUPPORTS_C22);

Annotation

Implementation Notes