2009-02-05 08:42:12 +08:00
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/*
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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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*
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* Author: Andy Fleming <afleming@freescale.com>
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2009-11-02 15:03:22 +08:00
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* Modifier: Sandeep Gopalpet <sandeep.kumar@freescale.com>
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2009-02-05 08:42:12 +08:00
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*
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2009-11-02 15:03:22 +08:00
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* Copyright 2002-2004, 2008-2009 Freescale Semiconductor, Inc.
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2009-02-05 08:42:12 +08:00
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*
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* Based on gianfar_mii.c and ucc_geth_mii.c (Li Yang, Kim Phillips)
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*
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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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*
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*/
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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/mm.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.h>
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2010-07-30 01:49:01 +08:00
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#include <linux/of_address.h>
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2009-04-25 20:53:07 +08:00
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#include <linux/of_mdio.h>
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2009-02-05 08:42:12 +08:00
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#include <linux/of_platform.h>
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#include <asm/io.h>
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#include <asm/irq.h>
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#include <asm/uaccess.h>
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#include <asm/ucc.h>
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#include "gianfar.h"
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#include "fsl_pq_mdio.h"
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2009-12-30 16:23:34 +08:00
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struct fsl_pq_mdio_priv {
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void __iomem *map;
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struct fsl_pq_mdio __iomem *regs;
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};
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2009-02-05 08:42:12 +08:00
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/*
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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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*/
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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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{
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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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cpu_relax();
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return 0;
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}
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/*
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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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*/
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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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{
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u16 value;
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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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cpu_relax();
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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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return value;
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}
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2009-11-04 20:52:57 +08:00
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static struct fsl_pq_mdio __iomem *fsl_pq_mdio_get_regs(struct mii_bus *bus)
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{
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2009-12-30 16:23:34 +08:00
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struct fsl_pq_mdio_priv *priv = bus->priv;
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return priv->regs;
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2009-11-04 20:52:57 +08:00
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}
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2009-02-05 08:42:12 +08:00
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/*
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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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*/
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int fsl_pq_mdio_write(struct mii_bus *bus, int mii_id, int regnum, u16 value)
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{
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2009-11-04 20:52:57 +08:00
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struct fsl_pq_mdio __iomem *regs = fsl_pq_mdio_get_regs(bus);
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2009-02-05 08:42:12 +08:00
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/* Write to the local MII regs */
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2010-09-23 13:40:09 +08:00
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return fsl_pq_local_mdio_write(regs, mii_id, regnum, value);
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2009-02-05 08:42:12 +08:00
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}
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/*
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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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*/
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int fsl_pq_mdio_read(struct mii_bus *bus, int mii_id, int regnum)
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{
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2009-11-04 20:52:57 +08:00
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struct fsl_pq_mdio __iomem *regs = fsl_pq_mdio_get_regs(bus);
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2009-02-05 08:42:12 +08:00
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/* Read the local MII regs */
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2010-09-23 13:40:09 +08:00
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return fsl_pq_local_mdio_read(regs, mii_id, regnum);
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2009-02-05 08:42:12 +08:00
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}
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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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{
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2009-11-04 20:52:57 +08:00
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struct fsl_pq_mdio __iomem *regs = fsl_pq_mdio_get_regs(bus);
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2009-03-05 18:06:47 +08:00
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int timeout = PHY_INIT_TIMEOUT;
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2009-02-05 08:42:12 +08:00
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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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cpu_relax();
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mutex_unlock(&bus->mdio_lock);
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2009-03-05 18:06:47 +08:00
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if (timeout < 0) {
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2009-02-05 08:42:12 +08:00
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printk(KERN_ERR "%s: The MII Bus is stuck!\n",
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bus->name);
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return -EBUSY;
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}
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return 0;
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}
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void fsl_pq_mdio_bus_name(char *name, struct device_node *np)
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{
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2009-03-19 14:48:08 +08:00
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const u32 *addr;
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u64 taddr = OF_BAD_ADDR;
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2009-02-05 08:42:12 +08:00
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2009-03-19 14:48:08 +08:00
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addr = of_get_address(np, 0, NULL, NULL);
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if (addr)
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taddr = of_translate_address(np, addr);
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2009-02-05 08:42:12 +08:00
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2009-03-19 14:48:08 +08:00
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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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2009-02-05 08:42:12 +08:00
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}
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2009-04-03 04:57:30 +08:00
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EXPORT_SYMBOL_GPL(fsl_pq_mdio_bus_name);
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2009-02-05 08:42:12 +08:00
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/* Scan the bus in reverse, looking for an empty spot */
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static int fsl_pq_mdio_find_free(struct mii_bus *new_bus)
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{
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int i;
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for (i = PHY_MAX_ADDR; i > 0; i--) {
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u32 phy_id;
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if (get_phy_id(new_bus, i, &phy_id))
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return -1;
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if (phy_id == 0xffffffff)
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break;
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}
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return i;
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}
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2009-06-25 06:23:39 +08:00
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#if defined(CONFIG_GIANFAR) || defined(CONFIG_GIANFAR_MODULE)
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2009-11-02 15:03:22 +08:00
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static u32 __iomem *get_gfar_tbipa(struct fsl_pq_mdio __iomem *regs, struct device_node *np)
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2009-02-05 08:42:12 +08:00
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{
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struct gfar __iomem *enet_regs;
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/*
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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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*/
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2009-11-02 15:03:22 +08:00
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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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2010-04-23 15:12:35 +08:00
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return of_iomap(np, 1);
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2009-11-02 15:03:22 +08:00
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} else
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return NULL;
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2009-02-05 08:42:12 +08:00
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}
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#endif
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2009-06-25 06:23:39 +08:00
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#if defined(CONFIG_UCC_GETH) || defined(CONFIG_UCC_GETH_MODULE)
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2009-02-05 08:42:12 +08:00
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static int get_ucc_id_for_range(u64 start, u64 end, u32 *ucc_id)
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{
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struct device_node *np = NULL;
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int err = 0;
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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 (err)
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continue;
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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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const u32 *id;
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id = of_get_property(np, "cell-index", NULL);
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if (!id) {
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id = of_get_property(np, "device-id", NULL);
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if (!id)
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continue;
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}
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*ucc_id = *id;
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return 0;
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}
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}
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if (err)
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return err;
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else
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return -EINVAL;
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}
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#endif
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|
2010-08-06 23:25:50 +08:00
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static int fsl_pq_mdio_probe(struct platform_device *ofdev,
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2009-02-05 08:42:12 +08:00
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const struct of_device_id *match)
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{
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2010-04-14 07:12:29 +08:00
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struct device_node *np = ofdev->dev.of_node;
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2009-02-05 08:42:12 +08:00
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struct device_node *tbi;
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2009-12-30 16:23:34 +08:00
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struct fsl_pq_mdio_priv *priv;
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2009-11-02 15:03:22 +08:00
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struct fsl_pq_mdio __iomem *regs = NULL;
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2009-11-04 20:52:56 +08:00
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void __iomem *map;
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2009-02-05 08:42:12 +08:00
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u32 __iomem *tbipa;
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struct mii_bus *new_bus;
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int tbiaddr = -1;
|
2010-04-23 15:12:35 +08:00
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const u32 *addrp;
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2009-11-04 20:52:56 +08:00
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u64 addr = 0, size = 0;
|
2010-05-14 12:27:30 +08:00
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int err;
|
2009-02-05 08:42:12 +08:00
|
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|
2009-12-30 16:23:34 +08:00
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priv = kzalloc(sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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|
2009-02-05 08:42:12 +08:00
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new_bus = mdiobus_alloc();
|
2010-05-14 12:27:30 +08:00
|
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if (!new_bus) {
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err = -ENOMEM;
|
2009-12-30 16:23:34 +08:00
|
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goto err_free_priv;
|
2010-05-14 12:27:30 +08:00
|
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}
|
2009-02-05 08:42:12 +08:00
|
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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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2009-12-30 16:23:34 +08:00
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new_bus->priv = priv;
|
2009-02-05 08:42:12 +08:00
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fsl_pq_mdio_bus_name(new_bus->id, np);
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|
2010-04-23 15:12:35 +08:00
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addrp = of_get_address(np, 0, &size, NULL);
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if (!addrp) {
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|
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err = -EINVAL;
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|
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goto err_free_bus;
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|
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}
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|
|
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|
2009-02-05 08:42:12 +08:00
|
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|
/* Set the PHY base address */
|
2010-04-23 15:12:35 +08:00
|
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addr = of_translate_address(np, addrp);
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|
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if (addr == OF_BAD_ADDR) {
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|
|
err = -EINVAL;
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|
goto err_free_bus;
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}
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|
|
2009-11-04 20:52:56 +08:00
|
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|
map = ioremap(addr, size);
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if (!map) {
|
2009-02-05 08:42:12 +08:00
|
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|
err = -ENOMEM;
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|
goto err_free_bus;
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}
|
2009-12-30 16:23:34 +08:00
|
|
|
priv->map = map;
|
2009-02-05 08:42:12 +08:00
|
|
|
|
2009-11-04 20:52:56 +08:00
|
|
|
if (of_device_is_compatible(np, "fsl,gianfar-mdio") ||
|
|
|
|
of_device_is_compatible(np, "fsl,gianfar-tbi") ||
|
|
|
|
of_device_is_compatible(np, "fsl,ucc-mdio") ||
|
|
|
|
of_device_is_compatible(np, "ucc_geth_phy"))
|
|
|
|
map -= offsetof(struct fsl_pq_mdio, miimcfg);
|
|
|
|
regs = map;
|
2009-12-30 16:23:34 +08:00
|
|
|
priv->regs = regs;
|
2009-02-05 08:42:12 +08:00
|
|
|
|
2009-04-25 20:53:07 +08:00
|
|
|
new_bus->irq = kcalloc(PHY_MAX_ADDR, sizeof(int), GFP_KERNEL);
|
2009-02-05 08:42:12 +08:00
|
|
|
|
|
|
|
if (NULL == new_bus->irq) {
|
|
|
|
err = -ENOMEM;
|
|
|
|
goto err_unmap_regs;
|
|
|
|
}
|
|
|
|
|
|
|
|
new_bus->parent = &ofdev->dev;
|
|
|
|
dev_set_drvdata(&ofdev->dev, new_bus);
|
|
|
|
|
|
|
|
if (of_device_is_compatible(np, "fsl,gianfar-mdio") ||
|
2009-03-22 04:30:05 +08:00
|
|
|
of_device_is_compatible(np, "fsl,gianfar-tbi") ||
|
2009-11-02 15:03:22 +08:00
|
|
|
of_device_is_compatible(np, "fsl,etsec2-mdio") ||
|
|
|
|
of_device_is_compatible(np, "fsl,etsec2-tbi") ||
|
2009-02-05 08:42:12 +08:00
|
|
|
of_device_is_compatible(np, "gianfar")) {
|
2009-06-25 06:23:39 +08:00
|
|
|
#if defined(CONFIG_GIANFAR) || defined(CONFIG_GIANFAR_MODULE)
|
2009-11-02 15:03:22 +08:00
|
|
|
tbipa = get_gfar_tbipa(regs, np);
|
|
|
|
if (!tbipa) {
|
|
|
|
err = -EINVAL;
|
|
|
|
goto err_free_irqs;
|
|
|
|
}
|
2009-02-05 08:42:12 +08:00
|
|
|
#else
|
|
|
|
err = -ENODEV;
|
|
|
|
goto err_free_irqs;
|
|
|
|
#endif
|
|
|
|
} else if (of_device_is_compatible(np, "fsl,ucc-mdio") ||
|
|
|
|
of_device_is_compatible(np, "ucc_geth_phy")) {
|
2009-06-25 06:23:39 +08:00
|
|
|
#if defined(CONFIG_UCC_GETH) || defined(CONFIG_UCC_GETH_MODULE)
|
2009-02-05 08:42:12 +08:00
|
|
|
u32 id;
|
2009-06-02 12:04:14 +08:00
|
|
|
static u32 mii_mng_master;
|
2009-02-05 08:42:12 +08:00
|
|
|
|
|
|
|
tbipa = ®s->utbipar;
|
|
|
|
|
|
|
|
if ((err = get_ucc_id_for_range(addr, addr + size, &id)))
|
|
|
|
goto err_free_irqs;
|
|
|
|
|
2009-06-02 12:04:14 +08:00
|
|
|
if (!mii_mng_master) {
|
|
|
|
mii_mng_master = id;
|
|
|
|
ucc_set_qe_mux_mii_mng(id - 1);
|
|
|
|
}
|
2009-02-05 08:42:12 +08:00
|
|
|
#else
|
|
|
|
err = -ENODEV;
|
|
|
|
goto err_free_irqs;
|
|
|
|
#endif
|
|
|
|
} else {
|
|
|
|
err = -ENODEV;
|
|
|
|
goto err_free_irqs;
|
|
|
|
}
|
|
|
|
|
|
|
|
for_each_child_of_node(np, tbi) {
|
|
|
|
if (!strncmp(tbi->type, "tbi-phy", 8))
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (tbi) {
|
|
|
|
const u32 *prop = of_get_property(tbi, "reg", NULL);
|
|
|
|
|
|
|
|
if (prop)
|
|
|
|
tbiaddr = *prop;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (tbiaddr == -1) {
|
|
|
|
out_be32(tbipa, 0);
|
|
|
|
|
|
|
|
tbiaddr = fsl_pq_mdio_find_free(new_bus);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* We define TBIPA at 0 to be illegal, opting to fail for boards that
|
|
|
|
* have PHYs at 1-31, rather than change tbipa and rescan.
|
|
|
|
*/
|
|
|
|
if (tbiaddr == 0) {
|
|
|
|
err = -EBUSY;
|
|
|
|
|
|
|
|
goto err_free_irqs;
|
|
|
|
}
|
|
|
|
|
|
|
|
out_be32(tbipa, tbiaddr);
|
|
|
|
|
2009-04-25 20:53:07 +08:00
|
|
|
err = of_mdiobus_register(new_bus, np);
|
2009-02-05 08:42:12 +08:00
|
|
|
if (err) {
|
|
|
|
printk (KERN_ERR "%s: Cannot register as MDIO bus\n",
|
|
|
|
new_bus->name);
|
|
|
|
goto err_free_irqs;
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
err_free_irqs:
|
|
|
|
kfree(new_bus->irq);
|
|
|
|
err_unmap_regs:
|
2009-12-30 16:23:34 +08:00
|
|
|
iounmap(priv->map);
|
2009-02-05 08:42:12 +08:00
|
|
|
err_free_bus:
|
|
|
|
kfree(new_bus);
|
2009-12-30 16:23:34 +08:00
|
|
|
err_free_priv:
|
|
|
|
kfree(priv);
|
2009-02-05 08:42:12 +08:00
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
2010-08-06 23:25:50 +08:00
|
|
|
static int fsl_pq_mdio_remove(struct platform_device *ofdev)
|
2009-02-05 08:42:12 +08:00
|
|
|
{
|
|
|
|
struct device *device = &ofdev->dev;
|
|
|
|
struct mii_bus *bus = dev_get_drvdata(device);
|
2009-12-30 16:23:34 +08:00
|
|
|
struct fsl_pq_mdio_priv *priv = bus->priv;
|
2009-02-05 08:42:12 +08:00
|
|
|
|
|
|
|
mdiobus_unregister(bus);
|
|
|
|
|
|
|
|
dev_set_drvdata(device, NULL);
|
|
|
|
|
2009-12-30 16:23:34 +08:00
|
|
|
iounmap(priv->map);
|
2009-02-05 08:42:12 +08:00
|
|
|
bus->priv = NULL;
|
|
|
|
mdiobus_free(bus);
|
2009-12-30 16:23:34 +08:00
|
|
|
kfree(priv);
|
2009-02-05 08:42:12 +08:00
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct of_device_id fsl_pq_mdio_match[] = {
|
|
|
|
{
|
|
|
|
.type = "mdio",
|
|
|
|
.compatible = "ucc_geth_phy",
|
|
|
|
},
|
|
|
|
{
|
|
|
|
.type = "mdio",
|
|
|
|
.compatible = "gianfar",
|
|
|
|
},
|
|
|
|
{
|
|
|
|
.compatible = "fsl,ucc-mdio",
|
|
|
|
},
|
|
|
|
{
|
|
|
|
.compatible = "fsl,gianfar-tbi",
|
|
|
|
},
|
|
|
|
{
|
|
|
|
.compatible = "fsl,gianfar-mdio",
|
|
|
|
},
|
2009-11-02 15:03:22 +08:00
|
|
|
{
|
|
|
|
.compatible = "fsl,etsec2-tbi",
|
|
|
|
},
|
|
|
|
{
|
|
|
|
.compatible = "fsl,etsec2-mdio",
|
|
|
|
},
|
2009-02-05 08:42:12 +08:00
|
|
|
{},
|
|
|
|
};
|
2009-10-15 05:54:52 +08:00
|
|
|
MODULE_DEVICE_TABLE(of, fsl_pq_mdio_match);
|
2009-02-05 08:42:12 +08:00
|
|
|
|
|
|
|
static struct of_platform_driver fsl_pq_mdio_driver = {
|
2010-04-14 07:13:02 +08:00
|
|
|
.driver = {
|
|
|
|
.name = "fsl-pq_mdio",
|
|
|
|
.owner = THIS_MODULE,
|
|
|
|
.of_match_table = fsl_pq_mdio_match,
|
|
|
|
},
|
2009-02-05 08:42:12 +08:00
|
|
|
.probe = fsl_pq_mdio_probe,
|
|
|
|
.remove = fsl_pq_mdio_remove,
|
|
|
|
};
|
|
|
|
|
|
|
|
int __init fsl_pq_mdio_init(void)
|
|
|
|
{
|
|
|
|
return of_register_platform_driver(&fsl_pq_mdio_driver);
|
|
|
|
}
|
2009-04-25 20:53:44 +08:00
|
|
|
module_init(fsl_pq_mdio_init);
|
2009-02-05 08:42:12 +08:00
|
|
|
|
|
|
|
void fsl_pq_mdio_exit(void)
|
|
|
|
{
|
|
|
|
of_unregister_platform_driver(&fsl_pq_mdio_driver);
|
|
|
|
}
|
|
|
|
module_exit(fsl_pq_mdio_exit);
|
2009-11-06 16:50:28 +08:00
|
|
|
MODULE_LICENSE("GPL");
|