/* * 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> #include <linux/err.h> #include <linux/slab.h> #include <linux/of.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 addr; 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: pr_warn("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: pr_warn("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] = 0; fp->regs[MII_PHYSID2] = 0; 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_addr, int reg_num) { struct fixed_mdio_bus *fmb = bus->priv; struct fixed_phy *fp; if (reg_num >= MII_REGS_NUM) return -1; list_for_each_entry(fp, &fmb->phys, node) { if (fp->addr == phy_addr) { /* 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_addr, 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->addr == phydev->addr) { 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_addr, 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_addr] = irq; fp->addr = phy_addr; 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); void fixed_phy_del(int phy_addr) { struct fixed_mdio_bus *fmb = &platform_fmb; struct fixed_phy *fp, *tmp; list_for_each_entry_safe(fp, tmp, &fmb->phys, node) { if (fp->addr == phy_addr) { list_del(&fp->node); kfree(fp); return; } } } EXPORT_SYMBOL_GPL(fixed_phy_del); static int phy_fixed_addr; static DEFINE_SPINLOCK(phy_fixed_addr_lock); int fixed_phy_register(unsigned int irq, struct fixed_phy_status *status, struct device_node *np) { struct fixed_mdio_bus *fmb = &platform_fmb; struct phy_device *phy; int phy_addr; int ret; /* Get the next available PHY address, up to PHY_MAX_ADDR */ spin_lock(&phy_fixed_addr_lock); if (phy_fixed_addr == PHY_MAX_ADDR) { spin_unlock(&phy_fixed_addr_lock); return -ENOSPC; } phy_addr = phy_fixed_addr++; spin_unlock(&phy_fixed_addr_lock); ret = fixed_phy_add(PHY_POLL, phy_addr, status); if (ret < 0) return ret; phy = get_phy_device(fmb->mii_bus, phy_addr, false); if (!phy || IS_ERR(phy)) { fixed_phy_del(phy_addr); return -EINVAL; } of_node_get(np); phy->dev.of_node = np; ret = phy_device_register(phy); if (ret) { phy_device_free(phy); of_node_put(np); fixed_phy_del(phy_addr); return ret; } return 0; } 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 (IS_ERR(pdev)) { ret = PTR_ERR(pdev); goto err_pdev; } fmb->mii_bus = mdiobus_alloc(); if (fmb->mii_bus == NULL) { ret = -ENOMEM; goto err_mdiobus_reg; } snprintf(fmb->mii_bus->id, MII_BUS_ID_SIZE, "fixed-0"); fmb->mii_bus->name = "Fixed MDIO Bus"; fmb->mii_bus->priv = fmb; fmb->mii_bus->parent = &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_alloc; return 0; err_mdiobus_alloc: mdiobus_free(fmb->mii_bus); 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); mdiobus_free(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");