![Stephen Rothwell](/assets/img/avatar_default.png)
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Acked-by: Kumar Gala <galak@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
287 lines
6.9 KiB
C
287 lines
6.9 KiB
C
/*
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* drivers/net/ucc_geth_mii.c
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*
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* QE UCC Gigabit Ethernet Driver -- MII Management Bus Implementation
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* Provides Bus interface for MII Management regs in the UCC register space
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*
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* Copyright (C) 2007 Freescale Semiconductor, Inc.
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*
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* Authors: Li Yang <leoli@freescale.com>
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* Kim Phillips <kim.phillips@freescale.com>
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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/sched.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/fsl_devices.h>
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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 "ucc_geth_mii.h"
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#include "ucc_geth.h"
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#define DEBUG
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#ifdef DEBUG
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#define vdbg(format, arg...) printk(KERN_DEBUG , format "\n" , ## arg)
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#else
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#define vdbg(format, arg...) do {} while(0)
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#endif
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#define MII_DRV_DESC "QE UCC Ethernet Controller MII Bus"
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#define MII_DRV_NAME "fsl-uec_mdio"
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/* Write value to the PHY for this device to the register at regnum, */
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/* waiting until the write is done before it returns. All PHY */
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/* configuration has to be done through the master UEC MIIM regs */
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int uec_mdio_write(struct mii_bus *bus, int mii_id, int regnum, u16 value)
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{
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struct ucc_mii_mng __iomem *regs = (void __iomem *)bus->priv;
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/* Setting up the MII Mangement Address Register */
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out_be32(®s->miimadd,
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(mii_id << MIIMADD_PHY_ADDRESS_SHIFT) | regnum);
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/* Setting up the MII Mangement Control Register with the value */
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out_be32(®s->miimcon, value);
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/* Wait till MII management write is complete */
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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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/* Reads from register regnum in the PHY for device dev, */
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/* returning the value. Clears miimcom first. All PHY */
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/* configuration has to be done through the TSEC1 MIIM regs */
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int uec_mdio_read(struct mii_bus *bus, int mii_id, int regnum)
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{
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struct ucc_mii_mng __iomem *regs = (void __iomem *)bus->priv;
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u16 value;
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/* Setting up the MII Mangement Address Register */
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out_be32(®s->miimadd,
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(mii_id << MIIMADD_PHY_ADDRESS_SHIFT) | regnum);
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/* Clear miimcom, perform an MII management read cycle */
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out_be32(®s->miimcom, 0);
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out_be32(®s->miimcom, MIIMCOM_READ_CYCLE);
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/* Wait till MII management write is complete */
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while ((in_be32(®s->miimind)) & (MIIMIND_BUSY | MIIMIND_NOT_VALID))
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cpu_relax();
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/* Read MII management status */
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value = in_be32(®s->miimstat);
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return value;
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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 uec_mdio_reset(struct mii_bus *bus)
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{
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struct ucc_mii_mng __iomem *regs = (void __iomem *)bus->priv;
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unsigned 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_MANAGEMENT);
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/* Setup the MII Mgmt clock speed */
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out_be32(®s->miimcfg, MIIMCFG_MANAGEMENT_CLOCK_DIVIDE_BY_112);
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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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if (timeout <= 0) {
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printk(KERN_ERR "%s: The MII Bus is stuck!\n", 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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static int uec_mdio_probe(struct of_device *ofdev, const struct of_device_id *match)
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{
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struct device *device = &ofdev->dev;
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struct device_node *np = ofdev->node, *tempnp = NULL;
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struct device_node *child = NULL;
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struct ucc_mii_mng __iomem *regs;
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struct mii_bus *new_bus;
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struct resource res;
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int k, err = 0;
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new_bus = kzalloc(sizeof(struct mii_bus), GFP_KERNEL);
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if (NULL == new_bus)
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return -ENOMEM;
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new_bus->name = "UCC Ethernet Controller MII Bus";
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new_bus->read = &uec_mdio_read;
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new_bus->write = &uec_mdio_write;
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new_bus->reset = &uec_mdio_reset;
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memset(&res, 0, sizeof(res));
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err = of_address_to_resource(np, 0, &res);
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if (err)
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goto reg_map_fail;
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snprintf(new_bus->id, MII_BUS_ID_SIZE, "%x", res.start);
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new_bus->irq = kmalloc(32 * sizeof(int), GFP_KERNEL);
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if (NULL == new_bus->irq) {
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err = -ENOMEM;
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goto reg_map_fail;
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}
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for (k = 0; k < 32; k++)
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new_bus->irq[k] = PHY_POLL;
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while ((child = of_get_next_child(np, child)) != NULL) {
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int irq = irq_of_parse_and_map(child, 0);
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if (irq != NO_IRQ) {
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const u32 *id = of_get_property(child, "reg", NULL);
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new_bus->irq[*id] = irq;
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}
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}
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/* Set the base address */
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regs = ioremap(res.start, sizeof(struct ucc_mii_mng));
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if (NULL == regs) {
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err = -ENOMEM;
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goto ioremap_fail;
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}
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new_bus->priv = (void __force *)regs;
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new_bus->dev = device;
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dev_set_drvdata(device, new_bus);
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/* Read MII management master from device tree */
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while ((tempnp = of_find_compatible_node(tempnp, "network", "ucc_geth"))
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!= NULL) {
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struct resource tempres;
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err = of_address_to_resource(tempnp, 0, &tempres);
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if (err)
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goto bus_register_fail;
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/* if our mdio regs fall within this UCC regs range */
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if ((res.start >= tempres.start) &&
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(res.end <= tempres.end)) {
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/* set this UCC to be the MII master */
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const u32 *id;
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id = of_get_property(tempnp, "cell-index", NULL);
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if (!id) {
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id = of_get_property(tempnp, "device-id", NULL);
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if (!id)
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goto bus_register_fail;
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}
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ucc_set_qe_mux_mii_mng(*id - 1);
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/* assign the TBI an address which won't
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* conflict with the PHYs */
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out_be32(®s->utbipar, UTBIPAR_INIT_TBIPA);
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break;
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}
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}
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err = mdiobus_register(new_bus);
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if (0 != err) {
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printk(KERN_ERR "%s: Cannot register as MDIO bus\n",
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new_bus->name);
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goto bus_register_fail;
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}
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return 0;
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bus_register_fail:
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iounmap(regs);
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ioremap_fail:
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kfree(new_bus->irq);
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reg_map_fail:
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kfree(new_bus);
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return err;
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}
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static int uec_mdio_remove(struct of_device *ofdev)
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{
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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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mdiobus_unregister(bus);
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dev_set_drvdata(device, NULL);
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iounmap((void __iomem *)bus->priv);
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bus->priv = NULL;
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kfree(bus);
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return 0;
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}
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static struct of_device_id uec_mdio_match[] = {
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{
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.type = "mdio",
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.compatible = "ucc_geth_phy",
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},
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{
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.compatible = "fsl,ucc-mdio",
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},
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{},
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};
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static struct of_platform_driver uec_mdio_driver = {
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.name = MII_DRV_NAME,
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.probe = uec_mdio_probe,
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.remove = uec_mdio_remove,
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.match_table = uec_mdio_match,
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};
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int __init uec_mdio_init(void)
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{
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return of_register_platform_driver(&uec_mdio_driver);
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}
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/* called from __init ucc_geth_init, therefore can not be __exit */
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void uec_mdio_exit(void)
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{
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of_unregister_platform_driver(&uec_mdio_driver);
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}
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