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* Freescale PowerQUICC Ethernet Driver -- MIIM bus implementation
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* Provides Bus interface for MIIM regs
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* Author: Andy Fleming <afleming@freescale.com>
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* Modifier: Sandeep Gopalpet <sandeep.kumar@freescale.com>
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* Copyright 2002-2004, 2008-2009 Freescale Semiconductor, Inc.
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* Based on gianfar_mii.c and ucc_geth_mii.c (Li Yang, Kim Phillips)
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/errno.h>
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#include <linux/unistd.h>
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#include <linux/slab.h>
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#include <linux/interrupt.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/skbuff.h>
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#include <linux/spinlock.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/crc32.h>
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#include <linux/mii.h>
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#include <linux/phy.h>
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#include <linux/of_address.h>
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#include <linux/of_mdio.h>
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#include <linux/of_platform.h>
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#include <asm/uaccess.h>
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#include "fsl_pq_mdio.h"
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struct fsl_pq_mdio_priv {
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struct fsl_pq_mdio __iomem *regs;
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* Write value to the PHY at mii_id at register regnum,
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* on the bus attached to the local interface, which may be different from the
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* generic mdio bus (tied to a single interface), waiting until the write is
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* done before returning. This is helpful in programming interfaces like
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* the TBI which control interfaces like onchip SERDES and are always tied to
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* the local mdio pins, which may not be the same as system mdio bus, used for
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* controlling the external PHYs, for example.
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int fsl_pq_local_mdio_write(struct fsl_pq_mdio __iomem *regs, int mii_id,
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int regnum, u16 value)
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/* Set the PHY address and the register address we want to write */
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out_be32(®s->miimadd, (mii_id << 8) | regnum);
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/* Write out the value we want */
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out_be32(®s->miimcon, value);
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/* Wait for the transaction to finish */
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while (in_be32(®s->miimind) & MIIMIND_BUSY)
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* Read the bus for PHY at addr mii_id, register regnum, and
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* return the value. Clears miimcom first. All PHY operation
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* done on the bus attached to the local interface,
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* which may be different from the generic mdio bus
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* This is helpful in programming interfaces like
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* the TBI which, in turn, control interfaces like onchip SERDES
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* and are always tied to the local mdio pins, which may not be the
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* same as system mdio bus, used for controlling the external PHYs, for eg.
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int fsl_pq_local_mdio_read(struct fsl_pq_mdio __iomem *regs,
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int mii_id, int regnum)
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/* Set the PHY address and the register address we want to read */
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out_be32(®s->miimadd, (mii_id << 8) | regnum);
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/* Clear miimcom, and then initiate a read */
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out_be32(®s->miimcom, 0);
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out_be32(®s->miimcom, MII_READ_COMMAND);
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/* Wait for the transaction to finish */
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while (in_be32(®s->miimind) & (MIIMIND_NOTVALID | MIIMIND_BUSY))
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/* Grab the value of the register from miimstat */
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value = in_be32(®s->miimstat);
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static struct fsl_pq_mdio __iomem *fsl_pq_mdio_get_regs(struct mii_bus *bus)
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struct fsl_pq_mdio_priv *priv = bus->priv;
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* Write value to the PHY at mii_id at register regnum,
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* on the bus, waiting until the write is done before returning.
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int fsl_pq_mdio_write(struct mii_bus *bus, int mii_id, int regnum, u16 value)
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struct fsl_pq_mdio __iomem *regs = fsl_pq_mdio_get_regs(bus);
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/* Write to the local MII regs */
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return fsl_pq_local_mdio_write(regs, mii_id, regnum, value);
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* Read the bus for PHY at addr mii_id, register regnum, and
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* return the value. Clears miimcom first.
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int fsl_pq_mdio_read(struct mii_bus *bus, int mii_id, int regnum)
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struct fsl_pq_mdio __iomem *regs = fsl_pq_mdio_get_regs(bus);
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/* Read the local MII regs */
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return fsl_pq_local_mdio_read(regs, mii_id, regnum);
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/* Reset the MIIM registers, and wait for the bus to free */
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static int fsl_pq_mdio_reset(struct mii_bus *bus)
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struct fsl_pq_mdio __iomem *regs = fsl_pq_mdio_get_regs(bus);
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int timeout = PHY_INIT_TIMEOUT;
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mutex_lock(&bus->mdio_lock);
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/* Reset the management interface */
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out_be32(®s->miimcfg, MIIMCFG_RESET);
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/* Setup the MII Mgmt clock speed */
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out_be32(®s->miimcfg, MIIMCFG_INIT_VALUE);
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/* Wait until the bus is free */
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while ((in_be32(®s->miimind) & MIIMIND_BUSY) && timeout--)
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mutex_unlock(&bus->mdio_lock);
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printk(KERN_ERR "%s: The MII Bus is stuck!\n",
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void fsl_pq_mdio_bus_name(char *name, struct device_node *np)
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u64 taddr = OF_BAD_ADDR;
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addr = of_get_address(np, 0, NULL, NULL);
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taddr = of_translate_address(np, addr);
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snprintf(name, MII_BUS_ID_SIZE, "%s@%llx", np->name,
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(unsigned long long)taddr);
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EXPORT_SYMBOL_GPL(fsl_pq_mdio_bus_name);
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static u32 __iomem *get_gfar_tbipa(struct fsl_pq_mdio __iomem *regs, struct device_node *np)
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#if defined(CONFIG_GIANFAR) || defined(CONFIG_GIANFAR_MODULE)
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struct gfar __iomem *enet_regs;
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* This is mildly evil, but so is our hardware for doing this.
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* Also, we have to cast back to struct gfar because of
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* definition weirdness done in gianfar.h.
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if(of_device_is_compatible(np, "fsl,gianfar-mdio") ||
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of_device_is_compatible(np, "fsl,gianfar-tbi") ||
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of_device_is_compatible(np, "gianfar")) {
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enet_regs = (struct gfar __iomem *)regs;
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return &enet_regs->tbipa;
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} else if (of_device_is_compatible(np, "fsl,etsec2-mdio") ||
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of_device_is_compatible(np, "fsl,etsec2-tbi")) {
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return of_iomap(np, 1);
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static int get_ucc_id_for_range(u64 start, u64 end, u32 *ucc_id)
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#if defined(CONFIG_UCC_GETH) || defined(CONFIG_UCC_GETH_MODULE)
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struct device_node *np = NULL;
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for_each_compatible_node(np, NULL, "ucc_geth") {
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struct resource tempres;
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err = of_address_to_resource(np, 0, &tempres);
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/* if our mdio regs fall within this UCC regs range */
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if ((start >= tempres.start) && (end <= tempres.end)) {
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/* Find the id of the UCC */
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id = of_get_property(np, "cell-index", NULL);
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id = of_get_property(np, "device-id", NULL);
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static int fsl_pq_mdio_probe(struct platform_device *ofdev)
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struct device_node *np = ofdev->dev.of_node;
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struct device_node *tbi;
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struct fsl_pq_mdio_priv *priv;
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struct fsl_pq_mdio __iomem *regs = NULL;
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struct mii_bus *new_bus;
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u64 addr = 0, size = 0;
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priv = kzalloc(sizeof(*priv), GFP_KERNEL);
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new_bus = mdiobus_alloc();
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new_bus->name = "Freescale PowerQUICC MII Bus",
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new_bus->read = &fsl_pq_mdio_read,
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new_bus->write = &fsl_pq_mdio_write,
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new_bus->reset = &fsl_pq_mdio_reset,
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new_bus->priv = priv;
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fsl_pq_mdio_bus_name(new_bus->id, np);
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addrp = of_get_address(np, 0, &size, NULL);
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/* Set the PHY base address */
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addr = of_translate_address(np, addrp);
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if (addr == OF_BAD_ADDR) {
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map = ioremap(addr, size);
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if (of_device_is_compatible(np, "fsl,gianfar-mdio") ||
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of_device_is_compatible(np, "fsl,gianfar-tbi") ||
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of_device_is_compatible(np, "fsl,ucc-mdio") ||
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of_device_is_compatible(np, "ucc_geth_phy"))
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map -= offsetof(struct fsl_pq_mdio, miimcfg);
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new_bus->irq = kcalloc(PHY_MAX_ADDR, sizeof(int), GFP_KERNEL);
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if (NULL == new_bus->irq) {
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new_bus->parent = &ofdev->dev;
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dev_set_drvdata(&ofdev->dev, new_bus);
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if (of_device_is_compatible(np, "fsl,gianfar-mdio") ||
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of_device_is_compatible(np, "fsl,gianfar-tbi") ||
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of_device_is_compatible(np, "fsl,etsec2-mdio") ||
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of_device_is_compatible(np, "fsl,etsec2-tbi") ||
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of_device_is_compatible(np, "gianfar")) {
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tbipa = get_gfar_tbipa(regs, np);
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} else if (of_device_is_compatible(np, "fsl,ucc-mdio") ||
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of_device_is_compatible(np, "ucc_geth_phy")) {
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static u32 mii_mng_master;
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tbipa = ®s->utbipar;
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if ((err = get_ucc_id_for_range(addr, addr + size, &id)))
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if (!mii_mng_master) {
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ucc_set_qe_mux_mii_mng(id - 1);
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for_each_child_of_node(np, tbi) {
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if (!strncmp(tbi->type, "tbi-phy", 8))
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const u32 *prop = of_get_property(tbi, "reg", NULL);
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out_be32(tbipa, tbiaddr);
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err = of_mdiobus_register(new_bus, np);
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printk (KERN_ERR "%s: Cannot register as MDIO bus\n",
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static int fsl_pq_mdio_remove(struct platform_device *ofdev)
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struct device *device = &ofdev->dev;
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struct mii_bus *bus = dev_get_drvdata(device);
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struct fsl_pq_mdio_priv *priv = bus->priv;
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mdiobus_unregister(bus);
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dev_set_drvdata(device, NULL);
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static struct of_device_id fsl_pq_mdio_match[] = {
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.compatible = "ucc_geth_phy",
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.compatible = "gianfar",
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.compatible = "fsl,ucc-mdio",
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.compatible = "fsl,gianfar-tbi",
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.compatible = "fsl,gianfar-mdio",
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.compatible = "fsl,etsec2-tbi",
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.compatible = "fsl,etsec2-mdio",
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MODULE_DEVICE_TABLE(of, fsl_pq_mdio_match);
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static struct platform_driver fsl_pq_mdio_driver = {
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.name = "fsl-pq_mdio",
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.owner = THIS_MODULE,
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.of_match_table = fsl_pq_mdio_match,
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.probe = fsl_pq_mdio_probe,
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.remove = fsl_pq_mdio_remove,
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int __init fsl_pq_mdio_init(void)
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return platform_driver_register(&fsl_pq_mdio_driver);
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module_init(fsl_pq_mdio_init);
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void fsl_pq_mdio_exit(void)
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platform_driver_unregister(&fsl_pq_mdio_driver);
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module_exit(fsl_pq_mdio_exit);
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MODULE_LICENSE("GPL");