| 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/of_mdio.h> |
| 18 | #include <asm/io.h> |
| 19 | #include <asm/mpc52xx.h> |
| 20 | #include "fec_mpc52xx.h" |
| 21 | |
| 22 | struct mpc52xx_fec_mdio_priv { |
| 23 | struct mpc52xx_fec __iomem *regs; |
| 24 | int mdio_irqs[PHY_MAX_ADDR]; |
| 25 | }; |
| 26 | |
| 27 | static int mpc52xx_fec_mdio_transfer(struct mii_bus *bus, int phy_id, |
| 28 | int reg, u32 value) |
| 29 | { |
| 30 | struct mpc52xx_fec_mdio_priv *priv = bus->priv; |
| 31 | struct mpc52xx_fec __iomem *fec; |
| 32 | int tries = 3; |
| 33 | |
| 34 | value |= (phy_id << FEC_MII_DATA_PA_SHIFT) & FEC_MII_DATA_PA_MSK; |
| 35 | value |= (reg << FEC_MII_DATA_RA_SHIFT) & FEC_MII_DATA_RA_MSK; |
| 36 | |
| 37 | fec = priv->regs; |
| 38 | out_be32(&fec->ievent, FEC_IEVENT_MII); |
| 39 | out_be32(&priv->regs->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(&priv->regs->mii_data) & FEC_MII_DATA_DATAMSK : 0; |
| 50 | } |
| 51 | |
| 52 | static 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 | |
| 57 | static 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 | |
| 64 | static int mpc52xx_fec_mdio_probe(struct of_device *of, |
| 65 | const struct of_device_id *match) |
| 66 | { |
| 67 | struct device *dev = &of->dev; |
| 68 | struct device_node *np = of->node; |
| 69 | struct mii_bus *bus; |
| 70 | struct mpc52xx_fec_mdio_priv *priv; |
| 71 | struct resource res = {}; |
| 72 | int err; |
| 73 | int i; |
| 74 | |
| 75 | bus = mdiobus_alloc(); |
| 76 | if (bus == NULL) |
| 77 | return -ENOMEM; |
| 78 | priv = kzalloc(sizeof(*priv), GFP_KERNEL); |
| 79 | if (priv == NULL) { |
| 80 | err = -ENOMEM; |
| 81 | goto out_free; |
| 82 | } |
| 83 | |
| 84 | bus->name = "mpc52xx MII bus"; |
| 85 | bus->read = mpc52xx_fec_mdio_read; |
| 86 | bus->write = mpc52xx_fec_mdio_write; |
| 87 | |
| 88 | /* setup irqs */ |
| 89 | bus->irq = priv->mdio_irqs; |
| 90 | |
| 91 | /* setup registers */ |
| 92 | err = of_address_to_resource(np, 0, &res); |
| 93 | if (err) |
| 94 | goto out_free; |
| 95 | priv->regs = ioremap(res.start, res.end - res.start + 1); |
| 96 | if (priv->regs == NULL) { |
| 97 | err = -ENOMEM; |
| 98 | goto out_free; |
| 99 | } |
| 100 | |
| 101 | snprintf(bus->id, MII_BUS_ID_SIZE, "%x", res.start); |
| 102 | bus->priv = priv; |
| 103 | |
| 104 | bus->parent = dev; |
| 105 | dev_set_drvdata(dev, bus); |
| 106 | |
| 107 | /* set MII speed */ |
| 108 | out_be32(&priv->regs->mii_speed, |
| 109 | ((mpc5xxx_get_bus_frequency(of->node) >> 20) / 5) << 1); |
| 110 | |
| 111 | err = of_mdiobus_register(bus, np); |
| 112 | if (err) |
| 113 | goto out_unmap; |
| 114 | |
| 115 | return 0; |
| 116 | |
| 117 | out_unmap: |
| 118 | iounmap(priv->regs); |
| 119 | out_free: |
| 120 | for (i=0; i<PHY_MAX_ADDR; i++) |
| 121 | if (bus->irq[i] != PHY_POLL) |
| 122 | irq_dispose_mapping(bus->irq[i]); |
| 123 | kfree(bus->irq); |
| 124 | kfree(priv); |
| 125 | mdiobus_free(bus); |
| 126 | |
| 127 | return err; |
| 128 | } |
| 129 | |
| 130 | static int mpc52xx_fec_mdio_remove(struct of_device *of) |
| 131 | { |
| 132 | struct device *dev = &of->dev; |
| 133 | struct mii_bus *bus = dev_get_drvdata(dev); |
| 134 | struct mpc52xx_fec_mdio_priv *priv = bus->priv; |
| 135 | int i; |
| 136 | |
| 137 | mdiobus_unregister(bus); |
| 138 | dev_set_drvdata(dev, NULL); |
| 139 | |
| 140 | iounmap(priv->regs); |
| 141 | for (i=0; i<PHY_MAX_ADDR; i++) |
| 142 | if (bus->irq[i] != PHY_POLL) |
| 143 | irq_dispose_mapping(bus->irq[i]); |
| 144 | kfree(priv); |
| 145 | kfree(bus->irq); |
| 146 | mdiobus_free(bus); |
| 147 | |
| 148 | return 0; |
| 149 | } |
| 150 | |
| 151 | |
| 152 | static struct of_device_id mpc52xx_fec_mdio_match[] = { |
| 153 | { .compatible = "fsl,mpc5200b-mdio", }, |
| 154 | { .compatible = "fsl,mpc5200-mdio", }, |
| 155 | { .compatible = "mpc5200b-fec-phy", }, |
| 156 | {} |
| 157 | }; |
| 158 | |
| 159 | struct of_platform_driver mpc52xx_fec_mdio_driver = { |
| 160 | .name = "mpc5200b-fec-phy", |
| 161 | .probe = mpc52xx_fec_mdio_probe, |
| 162 | .remove = mpc52xx_fec_mdio_remove, |
| 163 | .match_table = mpc52xx_fec_mdio_match, |
| 164 | }; |
| 165 | |
| 166 | /* let fec driver call it, since this has to be registered before it */ |
| 167 | EXPORT_SYMBOL_GPL(mpc52xx_fec_mdio_driver); |
| 168 | |
| 169 | |
| 170 | MODULE_LICENSE("Dual BSD/GPL"); |