cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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fec_mpc52xx_phy.c (3766B)

      1/*
      2 * Driver for the MPC5200 Fast Ethernet Controller - MDIO bus driver
      3 *
      4 * Copyright (C) 2007  Domen Puncer, Telargo, Inc.
      5 * Copyright (C) 2008  Wolfram Sang, Pengutronix
      6 *
      7 * This file is licensed under the terms of the GNU General Public License
      8 * version 2. This program is licensed "as is" without any warranty of any
      9 * kind, whether express or implied.
     10 */
     11
     12#include <linux/kernel.h>
     13#include <linux/module.h>
     14#include <linux/netdevice.h>
     15#include <linux/phy.h>
     16#include <linux/of_platform.h>
     17#include <linux/slab.h>
     18#include <linux/of_address.h>
     19#include <linux/of_mdio.h>
     20#include <asm/io.h>
     21#include <asm/mpc52xx.h>
     22#include "fec_mpc52xx.h"
     23
     24struct mpc52xx_fec_mdio_priv {
     25	struct mpc52xx_fec __iomem *regs;
     26};
     27
     28static int mpc52xx_fec_mdio_transfer(struct mii_bus *bus, int phy_id,
     29		int reg, u32 value)
     30{
     31	struct mpc52xx_fec_mdio_priv *priv = bus->priv;
     32	struct mpc52xx_fec __iomem *fec = priv->regs;
     33	int tries = 3;
     34
     35	value |= (phy_id << FEC_MII_DATA_PA_SHIFT) & FEC_MII_DATA_PA_MSK;
     36	value |= (reg << FEC_MII_DATA_RA_SHIFT) & FEC_MII_DATA_RA_MSK;
     37
     38	out_be32(&fec->ievent, FEC_IEVENT_MII);
     39	out_be32(&fec->mii_data, value);
     40
     41	/* wait for it to finish, this takes about 23 us on lite5200b */
     42	while (!(in_be32(&fec->ievent) & FEC_IEVENT_MII) && --tries)
     43		msleep(1);
     44
     45	if (!tries)
     46		return -ETIMEDOUT;
     47
     48	return value & FEC_MII_DATA_OP_RD ?
     49		in_be32(&fec->mii_data) & FEC_MII_DATA_DATAMSK : 0;
     50}
     51
     52static int mpc52xx_fec_mdio_read(struct mii_bus *bus, int phy_id, int reg)
     53{
     54	return mpc52xx_fec_mdio_transfer(bus, phy_id, reg, FEC_MII_READ_FRAME);
     55}
     56
     57static int mpc52xx_fec_mdio_write(struct mii_bus *bus, int phy_id, int reg,
     58		u16 data)
     59{
     60	return mpc52xx_fec_mdio_transfer(bus, phy_id, reg,
     61		data | FEC_MII_WRITE_FRAME);
     62}
     63
     64static int mpc52xx_fec_mdio_probe(struct platform_device *of)
     65{
     66	struct device *dev = &of->dev;
     67	struct device_node *np = of->dev.of_node;
     68	struct mii_bus *bus;
     69	struct mpc52xx_fec_mdio_priv *priv;
     70	struct resource res;
     71	int err;
     72
     73	bus = mdiobus_alloc();
     74	if (bus == NULL)
     75		return -ENOMEM;
     76	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
     77	if (priv == NULL) {
     78		err = -ENOMEM;
     79		goto out_free;
     80	}
     81
     82	bus->name = "mpc52xx MII bus";
     83	bus->read = mpc52xx_fec_mdio_read;
     84	bus->write = mpc52xx_fec_mdio_write;
     85
     86	/* setup registers */
     87	err = of_address_to_resource(np, 0, &res);
     88	if (err)
     89		goto out_free;
     90	priv->regs = ioremap(res.start, resource_size(&res));
     91	if (priv->regs == NULL) {
     92		err = -ENOMEM;
     93		goto out_free;
     94	}
     95
     96	snprintf(bus->id, MII_BUS_ID_SIZE, "%x", res.start);
     97	bus->priv = priv;
     98
     99	bus->parent = dev;
    100	dev_set_drvdata(dev, bus);
    101
    102	/* set MII speed */
    103	out_be32(&priv->regs->mii_speed,
    104		((mpc5xxx_get_bus_frequency(of->dev.of_node) >> 20) / 5) << 1);
    105
    106	err = of_mdiobus_register(bus, np);
    107	if (err)
    108		goto out_unmap;
    109
    110	return 0;
    111
    112 out_unmap:
    113	iounmap(priv->regs);
    114 out_free:
    115	kfree(priv);
    116	mdiobus_free(bus);
    117
    118	return err;
    119}
    120
    121static int mpc52xx_fec_mdio_remove(struct platform_device *of)
    122{
    123	struct mii_bus *bus = platform_get_drvdata(of);
    124	struct mpc52xx_fec_mdio_priv *priv = bus->priv;
    125
    126	mdiobus_unregister(bus);
    127	iounmap(priv->regs);
    128	kfree(priv);
    129	mdiobus_free(bus);
    130
    131	return 0;
    132}
    133
    134static const struct of_device_id mpc52xx_fec_mdio_match[] = {
    135	{ .compatible = "fsl,mpc5200b-mdio", },
    136	{ .compatible = "fsl,mpc5200-mdio", },
    137	{ .compatible = "mpc5200b-fec-phy", },
    138	{}
    139};
    140MODULE_DEVICE_TABLE(of, mpc52xx_fec_mdio_match);
    141
    142struct platform_driver mpc52xx_fec_mdio_driver = {
    143	.driver = {
    144		.name = "mpc5200b-fec-phy",
    145		.owner = THIS_MODULE,
    146		.of_match_table = mpc52xx_fec_mdio_match,
    147	},
    148	.probe = mpc52xx_fec_mdio_probe,
    149	.remove = mpc52xx_fec_mdio_remove,
    150};
    151
    152/* let fec driver call it, since this has to be registered before it */
    153EXPORT_SYMBOL_GPL(mpc52xx_fec_mdio_driver);
    154
    155MODULE_LICENSE("Dual BSD/GPL");