/* * 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/of_platform.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; int tries = 100; 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; fec = priv->regs; out_be32(&fec->ievent, FEC_IEVENT_MII); out_be32(&priv->regs->mii_data, value); /* wait for it to finish, this takes about 23 us on lite5200b */ while (!(in_be32(&fec->ievent) & FEC_IEVENT_MII) && --tries) udelay(5); if (!tries) return -ETIMEDOUT; return value & FEC_MII_DATA_OP_RD ? in_be32(&priv->regs->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 of_device *of, const struct of_device_id *match) { struct device *dev = &of->dev; struct device_node *np = of->node; struct device_node *child = NULL; struct mii_bus *bus; struct mpc52xx_fec_mdio_priv *priv; struct resource res = {}; int err; int i; 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 irqs */ bus->irq = kmalloc(sizeof(bus->irq[0]) * PHY_MAX_ADDR, GFP_KERNEL); if (bus->irq == NULL) { err = -ENOMEM; goto out_free; } for (i=0; i<PHY_MAX_ADDR; i++) bus->irq[i] = PHY_POLL; while ((child = of_get_next_child(np, child)) != NULL) { int irq = irq_of_parse_and_map(child, 0); if (irq != NO_IRQ) { const u32 *id = of_get_property(child, "reg", NULL); if (id) bus->irq[*id] = irq; } } /* setup registers */ err = of_address_to_resource(np, 0, &res); if (err) goto out_free; priv->regs = ioremap(res.start, res.end - res.start + 1); 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, ((mpc52xx_find_ipb_freq(of->node) >> 20) / 5) << 1); /* enable MII interrupt */ out_be32(&priv->regs->imask, in_be32(&priv->regs->imask) | FEC_IMASK_MII); err = mdiobus_register(bus); if (err) goto out_unmap; return 0; out_unmap: iounmap(priv->regs); out_free: for (i=0; i<PHY_MAX_ADDR; i++) if (bus->irq[i] != PHY_POLL) irq_dispose_mapping(bus->irq[i]); kfree(bus->irq); kfree(priv); mdiobus_free(bus); return err; } static int mpc52xx_fec_mdio_remove(struct of_device *of) { struct device *dev = &of->dev; struct mii_bus *bus = dev_get_drvdata(dev); struct mpc52xx_fec_mdio_priv *priv = bus->priv; int i; mdiobus_unregister(bus); dev_set_drvdata(dev, NULL); iounmap(priv->regs); for (i=0; i<PHY_MAX_ADDR; i++) if (bus->irq[i]) irq_dispose_mapping(bus->irq[i]); kfree(priv); kfree(bus->irq); mdiobus_free(bus); return 0; } static struct of_device_id mpc52xx_fec_mdio_match[] = { { .compatible = "fsl,mpc5200b-mdio", }, { .compatible = "fsl,mpc5200-mdio", }, { .compatible = "mpc5200b-fec-phy", }, {} }; struct of_platform_driver mpc52xx_fec_mdio_driver = { .name = "mpc5200b-fec-phy", .probe = mpc52xx_fec_mdio_probe, .remove = mpc52xx_fec_mdio_remove, .match_table = mpc52xx_fec_mdio_match, }; /* 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");