/* * 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> #include <linux/gpio.h> #include <linux/seqlock.h> #include <linux/idr.h> #include "swphy.h" struct fixed_mdio_bus { struct mii_bus *mii_bus; struct list_head phys; }; struct fixed_phy { int addr; struct phy_device *phydev; seqcount_t seqcount; struct fixed_phy_status status; int (*link_update)(struct net_device *, struct fixed_phy_status *); struct list_head node; int link_gpio; }; static struct platform_device *pdev; static struct fixed_mdio_bus platform_fmb = { .phys = LIST_HEAD_INIT(platform_fmb.phys), }; static void fixed_phy_update(struct fixed_phy *fp) { if (gpio_is_valid(fp->link_gpio)) fp->status.link = !!gpio_get_value_cansleep(fp->link_gpio); } 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; list_for_each_entry(fp, &fmb->phys, node) { if (fp->addr == phy_addr) { struct fixed_phy_status state; int s; do { s = read_seqcount_begin(&fp->seqcount); /* Issue callback if user registered it. */ if (fp->link_update) fp->link_update(fp->phydev->attached_dev, &fp->status); /* Check the GPIO for change in status */ fixed_phy_update(fp); state = fp->status; } while (read_seqcount_retry(&fp->seqcount, s)); return swphy_read_reg(reg_num, &state); } } 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 (!phydev || !phydev->mdio.bus) return -EINVAL; list_for_each_entry(fp, &fmb->phys, node) { if (fp->addr == phydev->mdio.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 link_gpio) { int ret; struct fixed_mdio_bus *fmb = &platform_fmb; struct fixed_phy *fp; ret = swphy_validate_state(status); if (ret < 0) return ret; fp = kzalloc(sizeof(*fp), GFP_KERNEL); if (!fp) return -ENOMEM; seqcount_init(&fp->seqcount); if (irq != PHY_POLL) fmb->mii_bus->irq[phy_addr] = irq; fp->addr = phy_addr; fp->status = *status; fp->link_gpio = link_gpio; if (gpio_is_valid(fp->link_gpio)) { ret = gpio_request_one(fp->link_gpio, GPIOF_DIR_IN, "fixed-link-gpio-link"); if (ret) goto err_regs; } fixed_phy_update(fp); list_add_tail(&fp->node, &fmb->phys); return 0; err_regs: kfree(fp); return ret; } EXPORT_SYMBOL_GPL(fixed_phy_add); static DEFINE_IDA(phy_fixed_ida); static 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); if (gpio_is_valid(fp->link_gpio)) gpio_free(fp->link_gpio); kfree(fp); ida_simple_remove(&phy_fixed_ida, phy_addr); return; } } } struct phy_device *fixed_phy_register(unsigned int irq, struct fixed_phy_status *status, int link_gpio, struct device_node *np) { struct fixed_mdio_bus *fmb = &platform_fmb; struct phy_device *phy; int phy_addr; int ret; if (!fmb->mii_bus || fmb->mii_bus->state != MDIOBUS_REGISTERED) return ERR_PTR(-EPROBE_DEFER); /* Get the next available PHY address, up to PHY_MAX_ADDR */ phy_addr = ida_simple_get(&phy_fixed_ida, 0, PHY_MAX_ADDR, GFP_KERNEL); if (phy_addr < 0) return ERR_PTR(phy_addr); ret = fixed_phy_add(irq, phy_addr, status, link_gpio); if (ret < 0) { ida_simple_remove(&phy_fixed_ida, phy_addr); return ERR_PTR(ret); } phy = get_phy_device(fmb->mii_bus, phy_addr, false); if (IS_ERR(phy)) { fixed_phy_del(phy_addr); return ERR_PTR(-EINVAL); } /* propagate the fixed link values to struct phy_device */ phy->link = status->link; if (status->link) { phy->speed = status->speed; phy->duplex = status->duplex; phy->pause = status->pause; phy->asym_pause = status->asym_pause; } of_node_get(np); phy->mdio.dev.of_node = np; phy->is_pseudo_fixed_link = true; switch (status->speed) { case SPEED_1000: phy->supported = PHY_1000BT_FEATURES; break; case SPEED_100: phy->supported = PHY_100BT_FEATURES; break; case SPEED_10: default: phy->supported = PHY_10BT_FEATURES; } ret = phy_device_register(phy); if (ret) { phy_device_free(phy); of_node_put(np); fixed_phy_del(phy_addr); return ERR_PTR(ret); } return phy; } EXPORT_SYMBOL_GPL(fixed_phy_register); void fixed_phy_unregister(struct phy_device *phy) { phy_device_remove(phy); of_node_put(phy->mdio.dev.of_node); fixed_phy_del(phy->mdio.addr); } EXPORT_SYMBOL_GPL(fixed_phy_unregister); 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)) return PTR_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; 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); 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); } ida_destroy(&phy_fixed_ida); } module_exit(fixed_mdio_bus_exit); MODULE_DESCRIPTION("Fixed MDIO bus (MDIO bus emulation with fixed PHYs)"); MODULE_AUTHOR("Vitaly Bordug"); MODULE_LICENSE("GPL");