2 * drivers/net/gianfar_mii.c
4 * Gianfar Ethernet Driver -- MIIM bus implementation
5 * Provides Bus interface for MIIM regs
8 * Maintainer: Kumar Gala
10 * Copyright (c) 2002-2004 Freescale Semiconductor, Inc.
12 * This program is free software; you can redistribute it and/or modify it
13 * under the terms of the GNU General Public License as published by the
14 * Free Software Foundation; either version 2 of the License, or (at your
15 * option) any later version.
19 #include <linux/kernel.h>
20 #include <linux/string.h>
21 #include <linux/errno.h>
22 #include <linux/unistd.h>
23 #include <linux/slab.h>
24 #include <linux/interrupt.h>
25 #include <linux/init.h>
26 #include <linux/delay.h>
27 #include <linux/netdevice.h>
28 #include <linux/etherdevice.h>
29 #include <linux/skbuff.h>
30 #include <linux/spinlock.h>
32 #include <linux/module.h>
33 #include <linux/platform_device.h>
35 #include <linux/crc32.h>
36 #include <linux/mii.h>
37 #include <linux/phy.h>
41 #include <asm/uaccess.h>
44 #include "gianfar_mii.h"
46 /* Write value to the PHY at mii_id at register regnum,
47 * on the bus, waiting until the write is done before returning.
48 * All PHY configuration is done through the TSEC1 MIIM regs */
49 int gfar_mdio_write(struct mii_bus *bus, int mii_id, int regnum, u16 value)
51 struct gfar_mii __iomem *regs = (void __iomem *)bus->priv;
53 /* Set the PHY address and the register address we want to write */
54 gfar_write(®s->miimadd, (mii_id << 8) | regnum);
56 /* Write out the value we want */
57 gfar_write(®s->miimcon, value);
59 /* Wait for the transaction to finish */
60 while (gfar_read(®s->miimind) & MIIMIND_BUSY)
66 /* Read the bus for PHY at addr mii_id, register regnum, and
67 * return the value. Clears miimcom first. All PHY
68 * configuration has to be done through the TSEC1 MIIM regs */
69 int gfar_mdio_read(struct mii_bus *bus, int mii_id, int regnum)
71 struct gfar_mii __iomem *regs = (void __iomem *)bus->priv;
74 /* Set the PHY address and the register address we want to read */
75 gfar_write(®s->miimadd, (mii_id << 8) | regnum);
77 /* Clear miimcom, and then initiate a read */
78 gfar_write(®s->miimcom, 0);
79 gfar_write(®s->miimcom, MII_READ_COMMAND);
81 /* Wait for the transaction to finish */
82 while (gfar_read(®s->miimind) & (MIIMIND_NOTVALID | MIIMIND_BUSY))
85 /* Grab the value of the register from miimstat */
86 value = gfar_read(®s->miimstat);
92 /* Reset the MIIM registers, and wait for the bus to free */
93 int gfar_mdio_reset(struct mii_bus *bus)
95 struct gfar_mii __iomem *regs = (void __iomem *)bus->priv;
96 unsigned int timeout = PHY_INIT_TIMEOUT;
98 spin_lock_bh(&bus->mdio_lock);
100 /* Reset the management interface */
101 gfar_write(®s->miimcfg, MIIMCFG_RESET);
103 /* Setup the MII Mgmt clock speed */
104 gfar_write(®s->miimcfg, MIIMCFG_INIT_VALUE);
106 /* Wait until the bus is free */
107 while ((gfar_read(®s->miimind) & MIIMIND_BUSY) &&
111 spin_unlock_bh(&bus->mdio_lock);
114 printk(KERN_ERR "%s: The MII Bus is stuck!\n",
123 int gfar_mdio_probe(struct device *dev)
125 struct platform_device *pdev = to_platform_device(dev);
126 struct gianfar_mdio_data *pdata;
127 struct gfar_mii __iomem *regs;
128 struct mii_bus *new_bus;
135 new_bus = kzalloc(sizeof(struct mii_bus), GFP_KERNEL);
140 new_bus->name = "Gianfar MII Bus",
141 new_bus->read = &gfar_mdio_read,
142 new_bus->write = &gfar_mdio_write,
143 new_bus->reset = &gfar_mdio_reset,
144 new_bus->id = pdev->id;
146 pdata = (struct gianfar_mdio_data *)pdev->dev.platform_data;
149 printk(KERN_ERR "gfar mdio %d: Missing platform data!\n", pdev->id);
153 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
155 /* Set the PHY base address */
156 regs = ioremap(r->start, sizeof (struct gfar_mii));
163 new_bus->priv = (void __force *)regs;
165 new_bus->irq = pdata->irq;
168 dev_set_drvdata(dev, new_bus);
170 err = mdiobus_register(new_bus);
173 printk (KERN_ERR "%s: Cannot register as MDIO bus\n",
175 goto bus_register_fail;
189 int gfar_mdio_remove(struct device *dev)
191 struct mii_bus *bus = dev_get_drvdata(dev);
193 mdiobus_unregister(bus);
195 dev_set_drvdata(dev, NULL);
197 iounmap((void __iomem *)bus->priv);
204 static struct device_driver gianfar_mdio_driver = {
205 .name = "fsl-gianfar_mdio",
206 .bus = &platform_bus_type,
207 .probe = gfar_mdio_probe,
208 .remove = gfar_mdio_remove,
211 int __init gfar_mdio_init(void)
213 return driver_register(&gianfar_mdio_driver);
216 void __exit gfar_mdio_exit(void)
218 driver_unregister(&gianfar_mdio_driver);