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Release 4.11 drivers/net/ethernet/arc/emac_mdio.c

/*
 * Copyright (C) 2004-2013 Synopsys, Inc. (www.synopsys.com)
 *
 * MDIO implementation for ARC EMAC
 */

#include <linux/delay.h>
#include <linux/of_mdio.h>
#include <linux/platform_device.h>
#include <linux/gpio/consumer.h>

#include "emac.h"

/* Number of seconds we wait for "MDIO complete" flag to appear */

#define ARC_MDIO_COMPLETE_POLL_COUNT	1

/**
 * arc_mdio_complete_wait - Waits until MDIO transaction is completed.
 * @priv:       Pointer to ARC EMAC private data structure.
 *
 * returns:     0 on success, -ETIMEDOUT on a timeout.
 */

static int arc_mdio_complete_wait(struct arc_emac_priv *priv) { unsigned int i; for (i = 0; i < ARC_MDIO_COMPLETE_POLL_COUNT * 40; i++) { unsigned int status = arc_reg_get(priv, R_STATUS); status &= MDIO_MASK; if (status) { /* Reset "MDIO complete" flag */ arc_reg_set(priv, R_STATUS, status); return 0; } msleep(25); } return -ETIMEDOUT; }

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PersonTokensPropCommitsCommitProp
Alexey Brodkin75100.00%1100.00%
Total75100.00%1100.00%

/** * arc_mdio_read - MDIO interface read function. * @bus: Pointer to MII bus structure. * @phy_addr: Address of the PHY device. * @reg_num: PHY register to read. * * returns: The register contents on success, -ETIMEDOUT on a timeout. * * Reads the contents of the requested register from the requested PHY * address. */
static int arc_mdio_read(struct mii_bus *bus, int phy_addr, int reg_num) { struct arc_emac_priv *priv = bus->priv; unsigned int value; int error; arc_reg_set(priv, R_MDIO, 0x60020000 | (phy_addr << 23) | (reg_num << 18)); error = arc_mdio_complete_wait(priv); if (error < 0) return error; value = arc_reg_get(priv, R_MDIO) & 0xffff; dev_dbg(priv->dev, "arc_mdio_read(phy_addr=%i, reg_num=%x) = %x\n", phy_addr, reg_num, value); return value; }

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Alexey Brodkin99100.00%1100.00%
Total99100.00%1100.00%

/** * arc_mdio_write - MDIO interface write function. * @bus: Pointer to MII bus structure. * @phy_addr: Address of the PHY device. * @reg_num: PHY register to write to. * @value: Value to be written into the register. * * returns: 0 on success, -ETIMEDOUT on a timeout. * * Writes the value to the requested register. */
static int arc_mdio_write(struct mii_bus *bus, int phy_addr, int reg_num, u16 value) { struct arc_emac_priv *priv = bus->priv; dev_dbg(priv->dev, "arc_mdio_write(phy_addr=%i, reg_num=%x, value=%x)\n", phy_addr, reg_num, value); arc_reg_set(priv, R_MDIO, 0x50020000 | (phy_addr << 23) | (reg_num << 18) | value); return arc_mdio_complete_wait(priv); }

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PersonTokensPropCommitsCommitProp
Alexey Brodkin73100.00%1100.00%
Total73100.00%1100.00%

/** * arc_mdio_reset * @bus: points to the mii_bus structure * Description: reset the MII bus */
static int arc_mdio_reset(struct mii_bus *bus) { struct arc_emac_priv *priv = bus->priv; struct arc_emac_mdio_bus_data *data = &priv->bus_data; if (data->reset_gpio) { gpiod_set_value_cansleep(data->reset_gpio, 1); msleep(data->msec); gpiod_set_value_cansleep(data->reset_gpio, 0); } return 0; }

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PersonTokensPropCommitsCommitProp
Caesar Wang6598.48%150.00%
Baoyou Xie11.52%150.00%
Total66100.00%2100.00%

/** * arc_mdio_probe - MDIO probe function. * @priv: Pointer to ARC EMAC private data structure. * * returns: 0 on success, -ENOMEM when mdiobus_alloc * (to allocate memory for MII bus structure) fails. * * Sets up and registers the MDIO interface. */
int arc_mdio_probe(struct arc_emac_priv *priv) { struct arc_emac_mdio_bus_data *data = &priv->bus_data; struct device_node *np = priv->dev->of_node; struct mii_bus *bus; int error; bus = mdiobus_alloc(); if (!bus) return -ENOMEM; priv->bus = bus; bus->priv = priv; bus->parent = priv->dev; bus->name = "Synopsys MII Bus"; bus->read = &arc_mdio_read; bus->write = &arc_mdio_write; bus->reset = &arc_mdio_reset; /* optional reset-related properties */ data->reset_gpio = devm_gpiod_get_optional(priv->dev, "phy-reset", GPIOD_OUT_LOW); if (IS_ERR(data->reset_gpio)) { error = PTR_ERR(data->reset_gpio); dev_err(priv->dev, "Failed to request gpio: %d\n", error); return error; } of_property_read_u32(np, "phy-reset-duration", &data->msec); /* A sane reset duration should not be longer than 1s */ if (data->msec > 1000) data->msec = 1; snprintf(bus->id, MII_BUS_ID_SIZE, "%s", bus->name); error = of_mdiobus_register(bus, priv->dev->of_node); if (error) { dev_err(priv->dev, "cannot register MDIO bus %s\n", bus->name); mdiobus_free(bus); return error; } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Alexey Brodkin12653.62%125.00%
Caesar Wang10544.68%125.00%
Romain Perier31.28%125.00%
Marek Vašut10.43%125.00%
Total235100.00%4100.00%

/** * arc_mdio_remove - MDIO remove function. * @priv: Pointer to ARC EMAC private data structure. * * Unregisters the MDIO and frees any associate memory for MII bus. */
int arc_mdio_remove(struct arc_emac_priv *priv) { mdiobus_unregister(priv->bus); mdiobus_free(priv->bus); priv->bus = NULL; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Alexey Brodkin33100.00%1100.00%
Total33100.00%1100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Alexey Brodkin42870.39%120.00%
Caesar Wang17428.62%120.00%
Romain Perier40.66%120.00%
Marek Vašut10.16%120.00%
Baoyou Xie10.16%120.00%
Total608100.00%5100.00%
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