e4f2379db6
Driver for non-standard on-chip ethernet device ARC EMAC 10/100, instantiated in some legacy ARC (Synopsys) FPGA Boards such as ARCAngel4/ML50x. Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com> Cc: Andy Shevchenko <andy.shevchenko@gmail.com> Cc: Francois Romieu <romieu@fr.zoreil.com> Cc: Joe Perches <joe@perches.com> Cc: Vineet Gupta <vgupta@synopsys.com> Cc: Mischa Jonker <mjonker@synopsys.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Grant Likely <grant.likely@linaro.org> Cc: Rob Herring <rob.herring@calxeda.com> Cc: Paul Gortmaker <paul.gortmaker@windriver.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: linux-kernel@vger.kernel.org Cc: devicetree-discuss@lists.ozlabs.org Cc: Florian Fainelli <florian@openwrt.org> Cc: David Laight <david.laight@aculab.com> Signed-off-by: David S. Miller <davem@davemloft.net>
152 lines
3.5 KiB
C
152 lines
3.5 KiB
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 "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;
|
|
}
|
|
|
|
/**
|
|
* 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;
|
|
}
|
|
|
|
/**
|
|
* 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);
|
|
}
|
|
|
|
/**
|
|
* arc_mdio_probe - MDIO probe function.
|
|
* @pdev: Pointer to platform device.
|
|
* @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 platform_device *pdev, struct arc_emac_priv *priv)
|
|
{
|
|
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;
|
|
|
|
snprintf(bus->id, MII_BUS_ID_SIZE, "%s", pdev->name);
|
|
|
|
error = of_mdiobus_register(bus, pdev->dev.of_node);
|
|
if (error) {
|
|
dev_err(priv->dev, "cannot register MDIO bus %s\n", bus->name);
|
|
mdiobus_free(bus);
|
|
return error;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* 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;
|
|
}
|