/* * Fixed MDIO bus (MDIO bus emulation with fixed PHYs) * * Author: Vitaly Bordug <vbordug@ru.mvista.com> * Anton Vorontsov <avorontsov@ru.mvista.com> * * Copyright (c) 2006-2007 MontaVista Software, Inc. * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2 of the License, or (at your * option) any later version. */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/platform_device.h> #include <linux/list.h> #include <linux/mii.h> #include <linux/phy.h> #include <linux/phy_fixed.h> #define MII_REGS_NUM 29 struct fixed_mdio_bus { int irqs[PHY_MAX_ADDR]; struct mii_bus mii_bus; struct list_head phys; }; struct fixed_phy { int id; u16 regs[MII_REGS_NUM]; struct phy_device *phydev; struct fixed_phy_status status; int (*link_update)(struct net_device *, struct fixed_phy_status *); struct list_head node; }; static struct platform_device *pdev; static struct fixed_mdio_bus platform_fmb = { .phys = LIST_HEAD_INIT(platform_fmb.phys), }; static int fixed_phy_update_regs(struct fixed_phy *fp) { u16 bmsr = BMSR_ANEGCAPABLE; u16 bmcr = 0; u16 lpagb = 0; u16 lpa = 0; if (fp->status.duplex) { bmcr |= BMCR_FULLDPLX; switch (fp->status.speed) { case 1000: bmsr |= BMSR_ESTATEN; bmcr |= BMCR_SPEED1000; lpagb |= LPA_1000FULL; break; case 100: bmsr |= BMSR_100FULL; bmcr |= BMCR_SPEED100; lpa |= LPA_100FULL; break; case 10: bmsr |= BMSR_10FULL; lpa |= LPA_10FULL; break; default: printk(KERN_WARNING "fixed phy: unknown speed\n"); return -EINVAL; } } else { switch (fp->status.speed) { case 1000: bmsr |= BMSR_ESTATEN; bmcr |= BMCR_SPEED1000; lpagb |= LPA_1000HALF; break; case 100: bmsr |= BMSR_100HALF; bmcr |= BMCR_SPEED100; lpa |= LPA_100HALF; break; case 10: bmsr |= BMSR_10HALF; lpa |= LPA_10HALF; break; default: printk(KERN_WARNING "fixed phy: unknown speed\n"); return -EINVAL; } } if (fp->status.link) bmsr |= BMSR_LSTATUS | BMSR_ANEGCOMPLETE; if (fp->status.pause) lpa |= LPA_PAUSE_CAP; if (fp->status.asym_pause) lpa |= LPA_PAUSE_ASYM; fp->regs[MII_PHYSID1] = fp->id >> 16; fp->regs[MII_PHYSID2] = fp->id; fp->regs[MII_BMSR] = bmsr; fp->regs[MII_BMCR] = bmcr; fp->regs[MII_LPA] = lpa; fp->regs[MII_STAT1000] = lpagb; return 0; } static int fixed_mdio_read(struct mii_bus *bus, int phy_id, int reg_num) { struct fixed_mdio_bus *fmb = container_of(bus, struct fixed_mdio_bus, mii_bus); struct fixed_phy *fp; if (reg_num >= MII_REGS_NUM) return -1; list_for_each_entry(fp, &fmb->phys, node) { if (fp->id == phy_id) { /* Issue callback if user registered it. */ if (fp->link_update) { fp->link_update(fp->phydev->attached_dev, &fp->status); fixed_phy_update_regs(fp); } return fp->regs[reg_num]; } } return 0xFFFF; } static int fixed_mdio_write(struct mii_bus *bus, int phy_id, int reg_num, u16 val) { return 0; } /* * If something weird is required to be done with link/speed, * network driver is able to assign a function to implement this. * May be useful for PHY's that need to be software-driven. */ int fixed_phy_set_link_update(struct phy_device *phydev, int (*link_update)(struct net_device *, struct fixed_phy_status *)) { struct fixed_mdio_bus *fmb = &platform_fmb; struct fixed_phy *fp; if (!link_update || !phydev || !phydev->bus) return -EINVAL; list_for_each_entry(fp, &fmb->phys, node) { if (fp->id == phydev->phy_id) { fp->link_update = link_update; fp->phydev = phydev; return 0; } } return -ENOENT; } EXPORT_SYMBOL_GPL(fixed_phy_set_link_update); int fixed_phy_add(unsigned int irq, int phy_id, struct fixed_phy_status *status) { int ret; struct fixed_mdio_bus *fmb = &platform_fmb; struct fixed_phy *fp; fp = kzalloc(sizeof(*fp), GFP_KERNEL); if (!fp) return -ENOMEM; memset(fp->regs, 0xFF, sizeof(fp->regs[0]) * MII_REGS_NUM); fmb->irqs[phy_id] = irq; fp->id = phy_id; fp->status = *status; ret = fixed_phy_update_regs(fp); if (ret) goto err_regs; list_add_tail(&fp->node, &fmb->phys); return 0; err_regs: kfree(fp); return ret; } EXPORT_SYMBOL_GPL(fixed_phy_add); static int __init fixed_mdio_bus_init(void) { struct fixed_mdio_bus *fmb = &platform_fmb; int ret; pdev = platform_device_register_simple("Fixed MDIO bus", 0, NULL, 0); if (!pdev) { ret = -ENOMEM; goto err_pdev; } fmb->mii_bus.id = 0; fmb->mii_bus.name = "Fixed MDIO Bus"; fmb->mii_bus.dev = &pdev->dev; fmb->mii_bus.read = &fixed_mdio_read; fmb->mii_bus.write = &fixed_mdio_write; fmb->mii_bus.irq = fmb->irqs; ret = mdiobus_register(&fmb->mii_bus); if (ret) goto err_mdiobus_reg; return 0; err_mdiobus_reg: platform_device_unregister(pdev); err_pdev: return ret; } module_init(fixed_mdio_bus_init); static void __exit fixed_mdio_bus_exit(void) { struct fixed_mdio_bus *fmb = &platform_fmb; struct fixed_phy *fp, *tmp; mdiobus_unregister(&fmb->mii_bus); platform_device_unregister(pdev); list_for_each_entry_safe(fp, tmp, &fmb->phys, node) { list_del(&fp->node); kfree(fp); } } module_exit(fixed_mdio_bus_exit); MODULE_DESCRIPTION("Fixed MDIO bus (MDIO bus emulation with fixed PHYs)"); MODULE_AUTHOR("Vitaly Bordug"); MODULE_LICENSE("GPL");