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